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POOLING AND SERVICING AGREEMENT

Pooling and Servicing Agreement

POOLING AND SERVICING AGREEMENT | Document Parties: CREDIT SUISSE COMMERCIAL MORTGAGE TRUST SERIES 2006-C4 | KEYCORP REAL ESTATE CAPITAL MARKETS, INC | LNR PARTNERS, INC. | NATIONAL CONSUMER COOPERATIVE BANK |  WELLS FARGO BANK, N.A., | LASALLE BANK NATIONAL ASSOCIATION You are currently viewing:
This Pooling and Servicing Agreement involves

CREDIT SUISSE COMMERCIAL MORTGAGE TRUST SERIES 2006-C4 | KEYCORP REAL ESTATE CAPITAL MARKETS, INC | LNR PARTNERS, INC. | NATIONAL CONSUMER COOPERATIVE BANK | WELLS FARGO BANK, N.A., | LASALLE BANK NATIONAL ASSOCIATION

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Title: POOLING AND SERVICING AGREEMENT
Governing Law: New York     Date: 10/13/2006
Law Firm: Bilzin Sumberg Baena Price & Axelrod LLP; Kraig Kohring, Polsinelli Shalton Welte Suelthaus P.C.,Alan Kazan, Bilzin Sumberg Baena Price &    

POOLING AND SERVICING AGREEMENT, Parties: credit suisse commercial mortgage trust series 2006-c4 , keycorp real estate capital markets  inc , lnr partners  inc. , national consumer cooperative bank ,  wells fargo bank  n.a.  , lasalle bank national association
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                                                                     EXHIBIT 4.1


              CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.,
                                    Depositor

                   KEYCORP REAL ESTATE CAPITAL MARKETS, INC.,
                              Master Servicer No. 1

                                    NCB, FSB,
                              Master Servicer No. 2

                               LNR PARTNERS, INC.,
                             Special Servicer No. 1

                       NATIONAL CONSUMER COOPERATIVE BANK,
                             Special Servicer No. 2

                             WELLS FARGO BANK, N.A.,
                                     Trustee

                        LASALLE BANK NATIONAL ASSOCIATION
                   Certificate Administrator and Paying Agent

                         POOLING AND SERVICING AGREEMENT

                          Dated as of September 1, 2006

                                 $4,273,091,953
                   Commercial Mortgage Pass-Through Certificates
                                 Series 2006-C4


<PAGE>

                                TABLE OF CONTENTS


                                    ARTICLE I

                                   DEFINITIONS

Section 1.01   Defined Terms................................................
Section 1.02   Certain Calculations.........................................
Section 1.03   General Interpretive Principles..............................
Section 1.04   Certain Matters with Respect to the 828-850 Madison
               Avenue Total Loan, the 500 Sansome Office Total
               Loan and the 3434 North Washington Boulevard Total
               Loan........................................................
Section 1.05   Certain Matters with respect to the 280 Park Avenue
               Total Loan..................................................
Section 1.06   Certain Considerations Regarding Reimbursements of
               Nonrecoverable Advances and Workout-Delayed
                Reimbursement Amounts.......................................


                               ARTICLE II

         CONVEYANCE OF LOANS; ORIGINAL ISSUANCE OF CERTIFICATES

Section 2.01   Conveyance of Loans..........................................
Section 2.02   Acceptance by Trustee........................................
Section 2.03   Representations, Warranties and Covenants of the
               Depositor; Repurchase and Substitution of Loans by
               the Responsible Parties for Defects in Mortgage
               Files, Breaches of Representations and Warranties
               and Other Matters...........................................
Section 2.04   Issuance of Uncertificated Lower-Tier Interests;
               Execution of Certificates...................................


                              ARTICLE III

             ADMINISTRATION AND SERVICING OF THE TRUST FUND

Section 3.01   General Servicing Matters....................................
Section 3.02   Collection of Loan Payments..................................
Section 3.03   Collection of Taxes, Assessments and Similar Items;
               Servicing Accounts..........................................
Section 3.04   The Collection Accounts, Distribution Account and
                Grantor Trust Distribution Account..........................
Section 3.05   Permitted Withdrawals from the Collection Accounts
               and the Distribution Account................................
Section 3.06   Investment of Funds in the Collection Accounts,
               Junior Loan Custodial Accounts, Servicing
               Accounts, Companion Loan Custodial Accounts,
               Servicing Accounts Cash Collateral Accounts,
               Lock-Box Accounts, REO Accounts, Distribution
                Account, Interest Reserve Account, Floating Rate
               Account and Excess Liquidation Proceeds Account.............
Section 3.07   Maintenance of Insurance Policies; Errors and
               Omissions and Fidelity Coverage.............................
Section 3.08   Enforcement of Due-On-Sale and Due-On-Encumbrance
               Clauses; Assumption Agreements; Defeasance
               Provisions; Other Provisions................................
Section 3.09   Realization Upon Defaulted Loans.............................
Section 3.10   Trustee to Cooperate; Release of Mortgage Files..............
Section 3.11   Servicing Compensation.......................................
Section 3.12   Reports to the Certificate Administrator;
                Collection Account Statements...............................
Section 3.13   [Reserved]...................................................
Section 3.14   [Reserved]...................................................
Section 3.15   Access to Certain Information................................
Section 3.16   Title to REO Property; REO Account...........................
Section 3.17   Management of REO Property...................................
Section 3.18   Sale of Defaulted Loans and REO Properties...................
Section 3.19   Additional Obligations of the applicable Master
               Servicer and Special Servicer; Inspections;
               Appraisals..................................................
Section 3.20   Modifications, Waivers, Amendments and Consents..............
Section 3.21   Transfer of Servicing Between Master Servicer and
               Special Servicer; Record Keeping; Asset Status
               Report......................................................
Section 3.22   Sub-Servicing Agreements.....................................
Section 3.23   Representations, Warranties and Covenants of the
               Master Servicers............................................
Section 3.24   Representations, Warranties and Covenants of the
                Special Servicers...........................................
Section 3.25   Limitation on Liability of the Directing
               Certificateholder...........................................
Section 3.26   [Reserved]...................................................
Section 3.27   Lock-Box Accounts and Servicing Accounts.....................
Section 3.28   Interest Reserve Account.....................................
Section 3.29   Limitations on and Authorizations of the Master
               Servicers and Special Servicers with Respect to
               Certain Loans...............................................
Section 3.30   REMIC and Grantor Trust Administration.......................
Section 3.31   Master Servicer and Special Servicer May Own
                Certificates................................................
Section 3.32   Certain Matters with Respect to the Loan
               Combinations................................................
Section 3.33   Swap Agreement...............................................
Section 3.34   Additional Matters with Respect to the Ritz Carlton
               Mortgage Loan...............................................
Section 3.35   Litigation Control...........................................


                                ARTICLE IV

                     PAYMENTS TO CERTIFICATEHOLDERS

Section 4.01   Distributions................................................
Section 4.02   Statements to Certificateholders; Reports by
               Trustee; Other Information Available to the
               Holders and Others..........................................
Section 4.03   P&I Advances.................................................
Section 4.04   Allocation of Collateral Support Deficit.....................
Section 4.05   Allocations of Uncovered Prepayment Interest
               Shortfall Amounts...........................................
Section 4.06   Grantor Trust Reporting......................................


                               ARTICLE V

                             THE CERTIFICATES

Section 5.01   The Certificates.............................................
Section 5.02   Registration of Transfer and Exchange of
               Certificates................................................
Section 5.03   Book-Entry Certificates......................................
Section 5.04   Mutilated, Destroyed, Lost or Stolen Certificates............
Section 5.05   Persons Deemed Owners........................................
Section 5.06   Certification by Certificateholders and Certificate
               Owners......................................................
Section 5.07   Appointment of Paying Agent..................................


                               ARTICLE VI

     THE DEPOSITOR, THE MASTER SERVICERS AND THE SPECIAL SERVICERS

Section 6.01   Liability of the Depositor, the Master Servicers
               and the Special Servicers...................................
Section 6.02   Merger, Consolidation or Conversion of the
               Depositor, the Master Servicers or the Special
               Servicers...................................................
Section 6.03   Limitation on Liability of the Trustee, the
               Certificate Administrator, the Depositor, the
               Master Servicers, the Special Servicers and Others..........
Section 6.04   Master Servicers and Special Servicers Not to Resign.........
Section 6.05   Rights of the Depositor in Respect of the Master
               Servicers and the Special Servicers.........................


                              ARTICLE VII

                                DEFAULT

Section 7.01   Events of Default; Master Servicer and Special
               Servicer Termination........................................
Section 7.02   Trustee to Act; Appointment of Successor.....................
Section 7.03   Notification to Certificateholders...........................
Section 7.04   Waiver of Events of Default..................................
Section 7.05   Trustee Advances.............................................


                              ARTICLE VIII

        CONCERNING THE TRUSTEE AND THE CERTIFICATE ADMINISTRATOR

Section 8.01   Duties of Trustee and Certificate Administrator..............
Section 8.02   Certain Matters Affecting the Trustee and the
               Certificate Administrator...................................
Section 8.03   Trustee and Certificate Administrator Not Liable
               for Validity or Sufficiency of Certificates or
               Loans.......................................................
Section 8.04   Trustee and Certificate Administrator May Own
               Certificates................................................
Section 8.05   Fees and Expenses of Trustee and Certificate
               Administrator; Reimbursements and Other Payments
               to Trustee..................................................
Section 8.06   Eligibility Requirements for Trustee and the
               Certificate Administrator...................................
Section 8.07   Resignation and Removal of the Trustee or
               Certificate Administrator...................................
Section 8.08   Successor Trustee or Certificate Administrator...............
Section 8.09   Merger or Consolidation of Trustee or Certificate
               Administrator...............................................
Section 8.10   Appointment of Co-Trustee or Separate Trustee................
Section 8.11   Appointment of Custodians....................................
Section 8.12   Access to Certain Information................................
Section 8.13   Representations, Warranties and Covenants of the
               Trustee.....................................................
Section 8.14   Representations, Warranties and Covenants of the
               Certificate Administrator...................................


                               ARTICLE IX

                              TERMINATION

Section 9.01   Termination Upon Repurchase or Liquidation of All
               Loans.......................................................
Section 9.02   Additional Termination Requirements..........................


                               ARTICLE X

                        MISCELLANEOUS PROVISIONS

Section 10.01 Amendment....................................................
Section 10.02 Recordation of Agreement; Counterparts.......................
Section 10.03 Limitation on Rights of Certificateholders...................
Section 10.04 Governing Law................................................
Section 10.05 Notices......................................................
Section 10.06 Severability of Provisions...................................
Section 10.07 Grant of a Security Interest.................................
Section 10.08 Successors and Assigns; Beneficiaries........................
Section 10.09 Article and Section Headings.................................
Section 10.10 Notices to Rating Agencies...................................


                               ARTICLE XI
          EXCHANGE ACT REPORTING AND REGULATION AB COMPLIANCE

Section 11.01 Intent of the Parties; Reasonableness........................
Section 11.02 Reserved.....................................................
Section 11.03 Information to be Provided by each Master Servicer,
               the Special Servicers, the Trustee, the
               Certificate Administrator and each Servicing
               Function Participant........................................
Section 11.04 Reserved.....................................................
Section 11.05 Filing Obligations...........................................
Section 11.06 Form 10-D Filings............................................
Section 11.07 Form 10-K Filings............................................
Section 11.08 Sarbanes-Oxley Certification.................................
Section 11.09 Form 8-K Filings.............................................
Section 11.10 Form 15 Filing; Incomplete Exchange Act Filings;
               Amendments to Exchange Act Reports..........................
Section 11.11 Annual Compliance Statements.................................
Section 11.12 Annual Reports on Assessment of Compliance with
               Servicing Criteria..........................................
Section 11.13 Annual Independent Public Accountants' Attestation...........
Section 11.14 Exchange Act Reporting Indemnification.......................
Section 11.15 Amendments...................................................
Section 11.16 Exchange Act Report Signatures; Delivery of
               Notices; Interpretation of Grace Periods....................
Section 11.17 Termination of the Certificate Administrator.................
Section 11.18 Certain Matters Relating to the Future
               Securitization of the Companion Loan........................


EXHIBITS

A-1       Form of Class A-1, Class A-1-A, Class A-2, Class A-AB, Class
         A-3, Class A-M and Class A-J Certificates
A-1A      Form of Class A-4FL Certificate
A-2       Form of Class A-X, Class A-SP and Class A-Y Certificates
A-3       Form of Class B, Class C, Class D, Class E, Class F, Class G,
         Class H, Class J, Class K, Class L, Class M, Class N, Class O,
         Class P, Class Q and Class S Certificates
A-4       Form of Class V Certificates
A-5       Form of Class R Certificates
B         Mortgage Loan Schedule
C-1       List of Additional Collateral Loans
C-2       List of Mezzanine Loans
D         Form of [Master] [Special] Servicer Request for Release
E         Form of Certificate Administrator Report
F-1A      Form I of Transferor Certificate for Transfers of
         Non-Registered Certificates
F-1B      Form II of Transferor Certificate for Transfers of
         Non-Registered Certificates
F-1C      Form I of Transferor Certificate for Transfers of Interests in
         Global Certificates for Classes of Non-Registered Certificates
F-1D      Form II of Transferor Certificate for Transfers of Interests
         in Global Certificates for Classes of Non-Registered
         Certificates
F-2A      Form I of Transferee Certificate for Transfers of
         Non-Registered Certificates Held in Physical Form
F-2B      Form II of Transferee Certificate for Transfers of
         Non-Registered Certificates Held in Physical Form
F-2C      Form I of Transferee Certificate for Transfers of Interests in
         Non-Registered Certificates Held in Book-Entry Form
F-2D      Form II of Transferee Certificate for Transfers of Interests
         in Non-Registered Certificates Held in Book-Entry Form
G-1       Form of Transferee Certificate in Connection with ERISA
         (Non-Registered Certificates and Non-Investment Grade
         Certificates Held in Fully Registered, Certificated Form)
G-2       Form of Transferee Certificate in Connection with ERISA
         (Non-Registered Certificates Held in Book-Entry Form)
H-1       Form of Residual Transfer Affidavit for Transfers of Class R
         Certificates
H-2       Form of Transferor Certificate for Transfers of Class R
         Certificates
I         Form of Acknowledgement of Proposed Special Servicer
J         Form of Lost Note Affidavit
K         List of Sub-Servicers
L         Form of Sarbanes-Oxley Certification
M         List of Broker Strip Loans
N         Schedule Of Reference Rates
O         Form of Custodial Certification
P         Form of Notice Regarding Defeasance of Mortgage Loan
Q         Form of Subordination Agreement of Co-op Loans
R         Reserved
S-1       Form of Information Request from Certificateholder or
         Certificate Owner
S-2        Form of Information Request from Prospective Investor
T         Class A-AB Targeted Principal Balance Table
U         Relevant Servicing Criteria
V         Additional Form 10-D Disclosure
W         Additional Form 10-K Disclosure
X         Form 8-K Disclosure
Y         Additional Notification Disclosure

<PAGE>

            This Pooling and Servicing Agreement (this "Agreement"), is dated as
of September 1, 2006, among CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES
CORP., as Depositor, KEYCORP REAL ESTATE CAPITAL MARKETS, INC, as Master
Servicer No. 1, NCB, FSB, as Master Servicer No. 2, LNR PARTNERS, INC., as
Special Servicer No. 1, NATIONAL CONSUMER COOPERATIVE BANK, as Special Servicer
No. 2, and WELLS FARGO BANK, N.A., as Trustee, and LASALLE BANK NATIONAL
ASSOCIATION, as Certificate Administrator and Paying Agent.

                             PRELIMINARY STATEMENT:

            The Depositor intends to sell commercial mortgage pass-through
certificates (collectively, the "Certificates"), to be issued under this
Agreement in multiple classes (each, a "Class"), which in the aggregate will
evidence the entire beneficial ownership interest in the trust fund (the "Trust
Fund") to be created hereunder, the primary assets of which will be a pool of
multifamily and commercial mortgage loans listed on Exhibit B hereto. As
provided herein, the Certificate Administrator shall elect or shall cause an
election to be made that each of the Upper-Tier REMIC, the Lower-Tier REMIC and
the 828-850 Madison Avenue Loan REMIC (each as defined herein) be treated for
federal income tax purposes as a "real estate mortgage investment conduit" (a
"REMIC"). The Excess Interest, the Grantor Trust Distribution Account, the
828-850 Madison Avenue Loan REMIC Residual Interest, the Class A-4FL Regular
Interest, the Swap Agreement and the Floating Rate Account (each as defined
herein) and the Broker Strip Interest (each as defined herein) shall not be
assets of any REMIC but shall be treated as assets of a grantor trust under
subpart E, Part I of subchapter J of the Code (the "Grantor Trust"). The Class V
Certificates will represent undivided beneficial interests in the portion of the
Grantor Trust consisting of the Excess Interest and the related proceeds thereof
in the Grantor Trust Distribution Account, each Broker Strip Payee shall be
treated as owning an undivided beneficial interest in the portion of the Grantor
Trust consisting of the related Broker Strip Interest and the related proceeds
thereof in the Grantor Trust Distribution Account, the Class R Certificates will
represent undivided beneficial interests in the portion of the Trust Fund
consisting of the 828-850 Madison Avenue Loan REMIC Residual Interest and the
related proceeds thereof in the Grantor Trust Distribution Account, and the
Class A-4FL Certificates will represent undivided beneficial interests in the
Class A-4FL Regular Interest, the Swap Agreement, the Floating Rate Account and
the related proceeds thereof in the Grantor Trust Distribution Account.
Additionally, the Trust shall not include any Junior Loan, any interest of any
Junior Loan Holder or any Junior Loan Custodial Account or any Companion Loan,
any interest of any Companion Loan Holder or any Companion Loan Custodial
Account.

                               UPPER-TIER REMIC

            As provided herein, the Certificate Administrator shall elect or
cause an election to be made to treat the segregated pool of assets consisting
of the Uncertificated Lower-Tier Interests and the proceeds thereof as a REMIC
for federal income tax purposes, and such segregated pool of assets will be
designated as the "Upper-Tier REMIC." The Class A-1, Class A-2, Class A-AB,
Class A-3, Class A-1-A, Class A-X, Class A-SP, Class A-Y, Class A-M, Class A-J,
Class B, Class C, Class D, Class E, Class F, Class G, Class H, Class J, Class K,
Class L, Class M, Class N, Class O, Class P, Class Q and Class S Certificates
and the Class A-4FL Regular Interest will evidence "regular interests" in the
Upper-Tier REMIC created hereunder. The sole class of "residual interests" in
the Upper-Tier REMIC will be evidenced by the Class R Certificates.

            The following table sets forth the designation, the initial
Pass-Through Rate (as defined herein), and the aggregate initial principal
amount (the "Original Class Principal Balance") or notional balance ("Original
Class Notional Amount"), as applicable, for each Class of Certificates
comprising the "regular interests" in the Upper-Tier REMIC:


<TABLE>
<CAPTION>
                                                             Original Class Principal Balance
                                                                (or, in the case of the
                                                           Class A-X, Class A-SP or Class A-Y
                                      Initial                   Certificates, Original Class
Class Designation               Pass-Through Rate(1)                  Notional Amount)
----------------------------    ------------------------     ----------------------------------
<S>                              <C>                          <C>
Class A-1                                     4.7710%(2)              $     68,884,000
Class A-2                                     5.3610%(2)              $     92,000,000
Class A-AB                                     5.4390%(2)              $    156,000,000
Class A-3                                     5.4670%(2)              $ 1,812,000,000
Class A-4FL Regular Interest                  5.4680%(3)              $    150,000,000
Class A-1-A                                    5.4600%(2)              $    712,280,000
Class A-X                                     0.0593%(4)              $ 4,273,091,953(5)
Class A-SP                                    0.5914%(6)              $ 4,039,124,000(5)
Class A-Y                                      0.1000%(7)              $    119,355,536(5)
Class A-M                                     5.5090%(2)              $    427,309,000
Class A-J                                     5.5380%(8)              $    341,847,000
Class B                                        5.5680%(9)              $     26,707,000
Class C                                       5.5220%(10)             $     64,097,000
Class D                                       5.6170%(11)             $     37,389,000
Class E                                        5.6470%(12)             $     21,366,000
Class F                                       5.6670%(13)             $     48,072,000
Class G                                       5.7260%(14)             $     42,731,000
Class H                                       5.9130%(15)             $     48,072,000
Class J                                       6.0120%(16)             $     48,072,000
Class K                                       6.0980%(17)             $     53,414,000
Class L                                       5.1480%(18)             $     10,683,000
Class M                                       5.1480%(18)             $     16,024,000
Class N                                       5.1480%(18)             $     16,024,000
Class O                                       5.1480%(18)             $      5,341,000
Class P                                       5.1480%(18)             $     10,683,000
Class Q                                       5.1480%(18)             $     10,683,000
Class S                                       5.1480%(18)             $     53,413,953
</TABLE>

------------
(1)   Expressed as a rate per annum. Approximate in the case of the Class A-X and
     Class A-SP Certificates.

(2)   Fixed Pass-Through Rate.

(3)   See definition of "Class A-4FL Regular Interest Pass-Through Rate" herein.

(4)   Variable Pass-Through Rate. See definition of "Class A-X Pass-Through Rate"
     herein.

(5)   Original Class Notional Amount. The Class A-X, Class A-SP and Class A-Y
     Certificates will not have principal amounts and will not entitle Holders
     to distributions of principal.

(6)   Variable Pass-Through Rate. See definition of "Class A-SP Pass-Through
     Rate" herein

(7)   Variable Pass-Through Rate. See definition of "Class A-Y Pass-Through Rate"
     herein.

(8)   Variable Pass-Through Rate. See definition of "Class A-J Pass-Through Rate"
     herein.

(9)   Variable Pass-Through Rate. See definition of "Class B Pass-Through Rate"
     herein.

(10) Variable Pass-Through Rate. See definition of "Class C Pass-Through Rate"
     herein.

(11) Variable Pass-Through Rate. See definition of "Class D Pass-Through Rate"
     herein.

(12) Variable Pass-Through Rate. See definition of "Class E Pass-Through Rate"
     herein.

(13) Variable Pass-Through Rate. See definition of "Class F Pass-Through Rate"
     herein.

(14) Variable Pass-Through Rate. See definition of "Class G Pass-Through Rate"
     herein.

(15) Variable Pass-Through Rate. See definition of "Class H Pass-Through Rate"
     herein.

(16) Variable Pass-Through Rate. See definition of "Class J Pass-Through Rate"
     herein.

(17) Variable Pass-Through Rate. See definition of "Class K Pass-Through Rate"
     herein.

(18) The lesser of 5.1480% and the Weighted Average Net Mortgage Rate.

The Class R Certificates will not have a principal amount or notional balance
and will not bear interest.

                                LOWER-TIER REMIC

            As provided herein, the Certificate Administrator shall elect or
cause an election to be made to treat the segregated pool of assets consisting
of the Loans (exclusive of the Broker Strip Interest and Excess Interest
thereon, the 828-850 Madison Avenue Loan and the 828-850 Madison Avenue Loan
REMIC Residual Interest), the 828-850 Madison Avenue Loan REMIC Regular Interest
and certain other related assets subject to this Agreement as a REMIC for
federal income tax purposes, and such segregated pool of assets will be
designated as the "Lower-Tier REMIC." The Class LA-1-1, Class LA-1-2, Class
LA-2-1, Class LA-2-2, Class LA-AB-1, Class LA-AB-2, Class LA-3-1, Class LA-3-2,
Class LA-3-3, Class LA-3-4, Class LA-3-5, Class LA-4FL, Class LA-1-A-1, Class
LA-1-A-2, Class LA-1-A-3, Class LA-1-A-4, Class LA-1-A-5, Class LA-1-A-6, Class
LA-1-A-7, Class LA-1-A-8, Class LA-M, Class LA-J, Class LA-Y, Class LB, Class
LC-1, Class LC-2, Class LD-1, Class LD-2, Class LE, Class LF-1, Class LF-2,
Class LG, Class LH-1, Class LH-2, Class LJ, Class LK, Class LL, Class LM, Class
LN, Class LO, Class LP, Class LQ and Class LS Lower-Tier Interests will
constitute "regular interests" in the Lower-Tier REMIC (the "Uncertificated
Lower-Tier Interests") created hereunder. The sole class of "residual interests"
in the Lower-Tier REMIC will be evidenced by the Class R Certificates.

            The following table sets forth, for each Class of Sequential Pay
Certificates and the Class A-Y Certificates (the "Corresponding Certificates"),
the corresponding Uncertificated Lower-Tier REMIC Interest or Interests (the
"Corresponding Uncertificated Lower-Tier Interests"), the corresponding
Component or Components of the Class A-X and Class A-SP Certificates (the
"Corresponding Components") and the Original Lower-Tier REMIC Principal Amount
or Original Lower-Tier Notional Balance for each Class of Uncertificated
Lower-Tier Interests.

                                           Original Lower
                                             Tier REMIC
                        Corresponding      Principal Amount       Corresponding
                       Uncertificated         or Original         Components of
   Corresponding          Lower-Tier           Lower-Tier       Class A-X and A-SP
    Certificates        Interests(1)(2)     Notional Balance      Certificates(1)
-------------------- ------------------ -------------------- -------------------
     Class A-1              LA-1-1              $     7,861,000         A-1-1
                           LA-1-2              $    61,023,000         A-1-2
     Class A-2              LA-2-1              $    75,372,000         A-2-1
                            LA-2-2              $    16,628,000         A-2-2
     Class A-AB             LA-AB-1             $   126,863,000        A-AB-1
                           LA-AB-2             $    29,137,000        A-AB-2
     Class A-3              LA-3-1              $   109,305,000         A-3-1
                           LA-3-2              $   206,998,000         A-3-2
                           LA-3-3              $   129,272,000         A-3-3
                           LA-3-4              $   144,363,000         A-3-4
                            LA-3-5              $1,222,062,000         A-3-5
    Class A-4FL             LA-4FL              $   150,000,000         A-4FL
    Class A-1-A            LA-1-A-1             $     1,769,000        A-1-A-1
                          LA-1-A-2             $    28,118,000        A-1-A-2
                          LA-1-A-3             $    29,148,000        A-1-A-3
                          LA-1-A-4             $    28,141,000        A-1-A-4
                          LA-1-A-5             $    62,827,000        A-1-A-5
                           LA-1-A-6             $    24,883,000        A-1-A-6
                          LA-1-A-7             $    23,744,000        A-1-A-7
                          LA-1-A-8             $   513,650,000        A-1-A-8
     Class A-M               LA-M                $   427,309,000          A-M
     Class A-J               LA-J               $   341,847,000          A-J
      Class B                 LB                $    26,707,000           B
      Class C                LC-1               $    29,313,000          C-1
                             LC-2               $    34,784,000          C-2
      Class D                LD-1               $     4,356,000          D-1
                            LD-2               $    33,033,000          D-2
      Class E                 LE                 $    21,366,000          E-
      Class F                LF-1               $     4,898,000          F-1
                            LF-2               $    43,174,000          F-2
      Class G                 LG                $    42,731,000           G
      Class H                LH-1               $    21,677,000          H-1
                            LH-2               $    26,395,000          H-2
      Class J                 LJ                $    48,072,000           J
      Class K                 LK                $    53,414,000           K
      Class L                 LL                $    10,683,000           L
      Class M                 LM                $    16,024,000           M
      Class N                 LN                $    16,024,000           N
      Class O                 LO                $     5,341,000           O
      Class P                 LP                $    10,683,000           P
      Class Q                 LQ                $    10,683,000           Q
      Class S                 LS                $    53,413,953           S
     Class A-Y               LA-Y               $   119,355,536          N/A

------------

(1)    The Uncertificated Lower-Tier Interests and the Components of the Class
      A-X and Class A-SP Certificates that correspond to any particular Class of
      Sequential Pay Certificates (the "Corresponding Class of Sequential Pay
      Certificates") also correspond to each other and, accordingly, constitute
      the "Corresponding Uncertificated Lower-Tier Interests" and the
      "Corresponding Components," respectively, with respect to each other.

(2)    The interest rate of each of the indicated Classes of Uncertificated
      Lower-Tier Interests other than the Class LA-Y Lower-Tier Interest is the
      Weighted Average Net Mortgage Rate; with respect to the Class LA-Y
      Lower-Tier Interest is the Class A-Y Pass-Through Rate.

            The Class R Certificates will not have principal amounts or notional
balances and will not bear interest.

                        828-850 MADISON AVENUE LOAN REMIC

            As provided herein, the 828-850 Madison Avenue Loan will be treated
as a separate REMIC for federal income tax purposes pursuant to the REMIC
declaration dated as of September 7, 2006 (the "REMIC Declaration"), and such
REMIC will be designated the "828-850 Madison Avenue Loan REMIC". The 828-850
Madison Avenue Loan REMIC Regular Interest (as defined herein) will evidence the
"regular interest" in the 828-850 Madison Avenue Loan REMIC and will be held as
an asset of the Lower-Tier REMIC. The sole class of "residual interests" in the
828-850 Madison Avenue Loan REMIC created under the REMIC Declaration will be
the 828-850 Madison Avenue Loan REMIC Residual Interest and will be held in the
Grantor Trust and will be beneficially owned by the Class R Certificates.

            The parties intend that the portion of the Trust Fund consisting of
(i) Excess Interest and the Grantor Trust Distribution Account, (ii) the 828-850
Madison Avenue Loan REMIC Residual Interest, (iii) the Broker Strip Interests
and related amounts in the Collection Account and (iv) the Class A-4FL Regular
Interest, the Swap Agreement and the Floating Rate Account shall constitute, and
that the affairs of such portion of the Trust Fund shall be conducted so as to
qualify such portion as, a "grantor trust" under subpart E, Part I of subchapter
J of the Code.

            As of the close of business on the Cut-off Date (as defined herein),
the Loans had an aggregate principal balance, after application of all payments
of principal due on or before such date, whether or not received, equal to
$4,273,091,953.

            The 280 Park Avenue Total Loan consists of the 280 Park Avenue Loan
and the 280 Park Avenue Companion Loan. The 280 Park Avenue Loan and the 280
Park Avenue Companion Loan are pari passu with each other. The 280 Park Avenue
Loan is part of the Trust Fund. The 280 Park Avenue Companion Loan is not part
of the Trust Fund. The 280 Park Avenue Loan and the 280 Park Avenue Companion
Loan will be serviced and administered in accordance with this Agreement and the
280 Park Avenue Intercreditor Agreement.

            In consideration of the mutual agreements herein contained, the
Depositor, the Master Servicers, the Special Servicers, the Certificate
Administrator and the Trustee agree as follows:

                                   ARTICLE I

                                   DEFINITIONS

            Section 1.01 Defined Terms.

            Whenever used in this Agreement the following words and phrases,
unless the context otherwise requires, shall have the meanings specified in this
Article.

            "30/360 Basis": The accrual of interest based on a 360-day year
consisting of twelve 30-day months.

            "30/360 Mortgage Loan": A Mortgage Loan that accrues interest on a
30/360 Basis or the Fed Ex Central Distribution Center Loan during the related
Fixed Interest Period.

            "280 Park Avenue Control Group": The holders of more than 50% of the
outstanding principal balance of the 280 Park Avenue Total Loan (provided, that
the mortgage loans constituting the 280 Park Avenue Total Loan are deemed to
remain outstanding even if the related Mortgaged Property becomes an REO
Property), designated, for purposes of objecting to 280 Park Avenue Specially
Designated Servicing Actions proposed by the Special Servicer with respect to
the 280 Park Avenue Total Loan or any related REO Property, directing the
actions of the Special Servicer with respect to the 280 Park Avenue Total Loan
(if it constitutes a Specially Serviced Loan) or any related REO Property and/or
replacing the Special Servicer in respect of the 280 Park Avenue Total Loan or
any related REO Property.

            "280 Park Avenue Intercreditor Agreement": The Agreement Among
Noteholders dated as of September 28, 2006, by and between Column Financial,
Inc., as Initial Note A-1 Holder and Column Financial Inc., as Initial Note A-2
Holder

            "280 Park Avenue Loan": With respect to the 280 Park Avenue Total
Loan, the pari passu portion of such loan evidenced by Note A-1 in the amount of
$300,000,000, which is included in the Trust. The 280 Park Avenue Loan is a
"Loan."

            "280 Park Avenue Total Loan": The 280 Park Avenue Loan and the 280
Park Avenue Companion Loan, collectively.

             "3434 North Washington Boulevard Intercreditor Agreement": The
Agreement Among Noteholders dated as of August 18, 2006, by and between LaSalle
Bank National Association, as Initial Note A Holder and LEM Funding 202, L.P.
and LEM Parallel 202, L.P. as Initial Note B Holder.

            "3434 North Washington Boulevard Junior Loan": The mortgage loan
that is secured, on a subordinate basis, by the same Mortgage on the 3434 North
Washington Boulevard Property as the 3434 North Washington Boulevard Loan, has a
Cut-off Date Principal Balance of $4,500,000 and is evidenced by the Note
designated "Note B." The 3434 North Washington Boulevard Junior Loan is not a
"Loan" hereunder.

            "3434 North Washington Boulevard Junior Loan Holder": The holder of
the 3434 North Washington Boulevard Junior Loan or any successor REO Loan with
respect thereto.

            "3434 North Washington Boulevard Loan": With respect to the 3434
North Washington Boulevard Total Loan, the mortgage loan, with a Cut-off Date
Principal Balance of $64,000,000, that is included in the Trust Fund and secured
by a Mortgage on the 3434 North Washington Boulevard Property. The 3434 North
Washington Boulevard Loan is a "Loan."

            "3434 North Washington Boulevard Total Loan": The aggregate
indebtedness, with an original principal amount of $68,500,000 that is secured
by the related Mortgage on the Mortgaged Property identified as 3434 North
Washington Boulevard. References herein to the 3434 North Washington Boulevard
Total Loan shall be construed to refer to the aggregate indebtedness under the
3434 North Washington Boulevard Loan and the 3434 North Washington Boulevard
Junior Loan.

            "500 Sansome Office Intercreditor Agreement": The Agreement Among
Noteholders dated as of July 19, 2006, by and between Column Financial, Inc., as
Initial Note A Holder and LEM Funding XLIII, LP and LEM Parallel XLIII, LP as
Initial Note B Holder.

            "500 Sansome Office Junior Loan": The mortgage loan that is secured,
on a subordinate basis, by the same Mortgage on the Mortgaged Property
identified as 500 Sansome Office as the 500 Sansome Office Loan, has a Cut-off
Date Principal Balance of $2,600,000 and is evidenced by the Note designated
"Note B." The 500 Sansome Office Junior Loan is not a "Loan" hereunder.

            "500 Sansome Office Junior Loan Holder": The holder of the 500
Sansome Office Junior Loan or any successor REO Loan with respect thereto.

            "500 Sansome Office Loan": With respect to the 500 Sansome Office
Total Loan, the mortgage loan, with a Cut-off Date Principal Balance of
$24,400,000, that is included in the Trust Fund and secured by a Mortgage on the
500 Sansome Office Property. The 500 Sansome Office Loan is a "Loan."

            "500 Sansome Office Total Loan": The aggregate indebtedness, with an
original principal amount of $27,000,000 that is secured by the related Mortgage
on the 500 Sansome Office Property. References herein to the 500 Sansome Office
Total Loan shall be construed to refer to the aggregate indebtedness under the
500 Sansome Office Loan and the 500 Sansome Office Junior Loan.

            "828-850 Madison Avenue Intercreditor Agreement": The Agreement
Among Noteholders dated as of November 18, 2005, by and between Column
Financial, Inc., as Initial Note A Holder and LRP Landesbank Rheinland-Pfalz as
Initial Note B Holder.

            "828-850 Madison Avenue Junior Loan": The mortgage loan that is
secured, on a subordinate basis, by the same Mortgage on the 828-850 Madison
Avenue Property as the 828-850 Madison Avenue Loan, has a Cut-off Date Principal
Balance of $20,000,000 and is evidenced by the Note designated "Note B." The
828-850 Madison Avenue Junior Loan is not a "Loan" hereunder.

            "828-850 Madison Avenue Junior Loan Holder": The holder of the
828-850 Madison Avenue Junior Loan or any successor REO Loan with respect
thereto.

            "828-850 Madison Avenue Loan": With respect to the 828-850 Madison
Avenue Total Loan, the mortgage loan, with a Cut-off Date Principal Balance of
$60,000,000, that is included in the Trust Fund and secured by a Mortgage on the
828-850 Madison Avenue Property. The 828-850 Madison Avenue Loan is a "Loan."

            "828-850 Madison Avenue Loan REMIC" shall mean the REMIC that was
created pursuant to the REMIC Declaration and that is constituted by the 828-850
Madison Avenue Loan, collections thereon, any REO Property acquired in respect
thereof and amounts held from time to time in the Collection Account or any REO
Account in respect thereof, with respect to which the Certificate Administrator
will make an election to be treated as a "real estate mortgage investment
conduit" within the meaning of the REMIC Provisions.

            "828-850 Madison Avenue Loan REMIC Regular Interest" shall mean the
uncertificated regular interest in the 828-850 Madison Avenue Loan. The
principal balance of the 828-850 Madison Avenue Loan REMIC Regular Interest
shall equal the outstanding Stated Principal Balance of the 828-850 Madison
Avenue Loan (or, if applicable, the deemed Stated Principal Balance of any
successor REO Mortgage Loan). Payments of principal, interest and prepayment
premiums received on or in respect of the 828-850 Madison Avenue Loan (or any
beneficial interest in any related Mortgaged Property) shall be deemed
distributable on the 828-850 Madison Avenue Loan REMIC Regular Interest, and
other collections of amounts received on or in respect of the 828-850 Madison
Avenue Loan shall be deemed distributable to the Trust Fund other than on the
828-850 Madison Avenue Loan REMIC Regular Interest.

            "828-850 Madison Avenue Loan REMIC Residual Interest" shall mean,
the sole class of "residual interest" in the 828-850 Madison Avenue Loan REMIC,
represented by the Class R Certificates.

            "828-850 Madison Avenue Property": The Mortgaged Property identified
on the Mortgage Loan Schedule as "828-850 Madison Avenue."

            "828-850 Madison Avenue Total Loan": The aggregate indebtedness,
with an original principal amount of $80,000,000 that is secured by the related
Mortgage on the 828-850 Madison Avenue Property. References herein to the
828-850 Madison Avenue Total Loan shall be construed to refer to the aggregate
indebtedness under the 828-850 Madison Avenue Loan and the 828-850 Madison
Avenue Junior Loan.

            "A Loan": The 280 Park Avenue Loan, the 500 Sansome Office Loan, the
828-850 Madison Avenue Loan, the 3434 North Washington Boulevard. Loan and each
CBA A Loan, each of which are senior in right of payment to the related Junior
Loan(s), if applicable, and pari passu in right of payment to the related
Companion Loan, if applicable.

            "A Note": With respect to any A Loan, the Mortgage Note included in
the Trust Fund, which is senior in right of payment to the related Junior Loan,
if any, and pari passu in right of payment to the related Companion Loan, if
applicable, in each case to the extent set forth in the related Intercreditor
Agreement.

            "Accrued Certificate Interest Amount": With respect to each
Distribution Date and each Class of Regular Certificates and the Class A-4FL
Regular Interest, an amount equal to interest for the related Interest Accrual
Period at the Pass-Through Rate applicable to such Class of Certificates or the
Class A-4FL Regular Interest, as applicable, for such Distribution Date, accrued
on the related Class Principal Balance of such Class (or, in the case of a Class
of Interest-Only Certificates, on the Class Notional Amount thereof) immediately
prior to such Distribution Date; with respect to the Class A-4FL Regular
Interest, one month's interest at the Pass-Through Rate for the Class A-4FL
Regular Interest for such Distribution Date, accrued on the related Class
Principal Balance as of the last day of the month immediately preceding such
Distribution Date. The Accrued Certificate Interest Amount for each such Class
shall be calculated on a 30/360 Basis.

            "Accrued Component Interest Amount": With respect to each Component
of the Class A-X and Class A-SP Certificates for any Distribution Date, an
amount equal to interest for the related Interest Accrual Period at the Class
A-X Strip Rate or Class A-SP Strip Rate, as applicable, with respect to such
Component for such Distribution Date, accrued on the Component Notional Amount
of such Component outstanding immediately prior to such Distribution Date. The
Accrued Component Interest Amount for each Component shall be calculated on a
30/360 Basis.

            "Actual/360 Basis": The accrual of interest based on the actual
number of days elapsed during each one-month accrual period in a year assumed to
consist of 360 days.

            "Additional Collateral": With respect to the Additional Collateral
Loan, the cash reserve or irrevocable letter of credit partially securing such
Additional Collateral Loan.

            "Additional Collateral Loan": Any of the Loans identified on Exhibit
C-1 hereto.

            "Additional Disclosure Notification:" The form of notification to be
included with any Additional Form 10-D Disclosure, Additional Form 10-K
Disclosure or Form 8-K Disclosure Information which is attached hereto as
Exhibit Y.

            "Additional Form 10-D Disclosure:" As defined in Section 11.06.

            "Additional Form 10-K Disclosure:" As defined in Section 11.07.

            "Additional Servicer": Individually or collectively, (x) each
Affiliate of any party as described by Section 1108(a)(2)(ii) of Regulation AB
that Services any of the Loans and (y) each Person who is not an Affiliate of
any party as described by Section 1108(a)(2)(iii) of Regulation AB, other than
the Trustee, who Services 10% or more of the Loans (calculated by Stated
Principal Balance).

            "Additional Servicing Compensation": As defined in Section 3.11(a).

            "Additional Trust Fund Expenses": An expense of the Trust Fund that
(i) arises out of a default on a Loan or Serviced Loan Combination or an
otherwise unanticipated event, (ii) is not covered by a Servicing Advance or a
corresponding collection from the related Borrower and (iii) does not represent
a loss on a Loan arising from the inability of a Master Servicer and/or a
Special Servicer to collect all amounts due and owing under the Loan, including
by reason of the fraud or bankruptcy of the Borrower or, to the extent not
covered by insurance, a casualty of any nature at a Mortgaged Property;
provided, however, that, "Additional Trust Fund Expense" shall not include any
of the foregoing amounts that have been recovered from the related Borrower or
Mortgaged Property.

            "Advance": Any P&I Advance or Servicing Advance.

            "Advance Interest": The interest accrued on any Advance at the
Reimbursement Rate, which is payable to the party hereto that made that Advance,
all in accordance with Section 3.03(d) or Section 4.03(d), as applicable.

            "Adverse REMIC Event": As defined in Section 3.30(f).

            "Affiliate": With respect to any specified Person, any other Person
controlling or controlled by or under common control with such specified Person.
For the purposes of this definition, "control" when used with respect to any
specified Person means the power to direct the management and policies of such
Person, directly or indirectly, whether through the ownership of voting
securities, by contract or otherwise and the terms "controlling" and
"controlled" have meanings correlative to the foregoing.

            "Agreement": This Pooling and Servicing Agreement and all amendments
hereof and supplements hereto.

             "Anticipated Repayment Date": With respect to any ARD Loan,
designated as such on the Mortgage Loan Schedule, the date upon which such ARD
Loan starts to accrue interest at its Revised Rate.

            "Appraisal": An appraisal prepared in accordance with 12 C.F.R. ss.
225.64 by an Appraiser selected by the Master Servicer or Special Servicer, as
applicable.

            "Appraisal Reduction Amount": For any Distribution Date and for any
Loan as to which an Appraisal Reduction Event has occurred, an amount calculated
by the applicable Special Servicer equal to the excess, if any, of: (a) the
Stated Principal Balance of such Loan; over (b) the excess, if any, of (i) the
sum of (A) 90% of the Appraised Value (as such Appraised Value may be adjusted
downward by the applicable Special Servicer in accordance with the Servicing
Standard, without implying any duty to do so, based on the applicable Special
Servicer's review of the Appraisal or such other information as the applicable
Special Servicer deems relevant) of the related Mortgaged Property as determined
(1) with respect to any Loan with an outstanding principal balance equal to or
greater than $2,000,000, by one or more Appraisals (the costs of which shall be
paid by the applicable Master Servicer as a Servicing Advance) or (2) with
respect to any Loan with an outstanding principal balance less than $2,000,000,
by an Appraisal (or an update of a prior Appraisal) (the costs of which shall be
paid by the applicable Master Servicer as a Servicing Advance) or an internal
valuation performed by the applicable Special Servicer, plus (B) any letter of
credit, reserve, escrow or similar amount held by the applicable Master Servicer
which are posted as additional security for payments due on the Loan, over (ii)
the sum of (X) to the extent not previously advanced by the applicable Master
Servicer or the Trustee, all unpaid interest on such Loan at a per annum rate
equal to its Mortgage Rate, (Y) all unreimbursed Advances in respect of such
Loan, together with interest thereon at the Reimbursement Rate, and (Z) all
currently due and unpaid real estate taxes and assessments, Insurance Policy
premiums, ground rents and all other amounts due and unpaid with respect to such
Loan, net of any amounts currently escrowed for such amounts (which taxes,
assessments, premiums, ground rents and other amounts have not been subject to
an Advance by the applicable Master Servicer or the Trustee); provided that, if
neither a required Appraisal has been obtained nor an internal valuation is
completed within the period required under Section 3.19(c) with respect to such
Loan, then until such Appraisal is obtained or such internal valuation is
completed, as the case may be, in accordance with Section 3.19(c) the Appraisal
Reduction Amount shall be equal to 25% of the Stated Principal Balance of such
Loan as of the date of the related Appraisal Reduction Event; and provided,
further, that, if the related Mortgaged Property has become an REO Property,
then references to "Loan" above in this definition shall include any successor
REO Loan with respect to the subject Loan.

            In the case of the 280 Park Avenue Loan (or any successor REO Loan
with respect thereto), any Appraisal Reduction Amount will be calculated in
respect of the 280 Park Avenue (or any successor REO Loans with respect
thereto), as if it was a single Loan (or single REO Loan), and any Appraisal
Reduction Amount shall be allocated between the 280 Park Avenue and the related
Companion Loan, pro rata according to their respective principal balances.

            In the case of the 828-850 Madison Avenue Loan (or any successor REO
Loan with respect thereto), any Appraisal Reduction Amount will be calculated in
respect of the 828-850 Madison Avenue Total Loan (or any successor REO Loans
with respect thereto), as if it was a single Loan (or single REO Loan), and any
Appraisal Reduction Amount shall be allocated first to the 828-850 Madison
Avenue Junior Loan (or any successor REO Loan with respect thereto), up to the
outstanding principal balance of such Junior Loan (or REO Loan), and then to the
828-850 Madison Avenue Loan (or any successor REO Loan with respect thereto).

            In the case of the 3434 North Washington Boulevard Loan (or any
successor REO Loan with respect thereto), any Appraisal Reduction Amount will be
calculated in respect of the 3434 North Washington Boulevard Total Loan (or any
successor REO Loans with respect thereto), as if it was a single Loan (or single
REO Loan), and any Appraisal Reduction Amount shall be allocated first to the
3434 North Washington Boulevard Junior Loan (or any successor REO Loan with
respect thereto), up to the outstanding principal balance of such Junior Loan
(or REO Loan), and then to the 3434 North Washington Boulevard Loan (or any
successor REO Loan with respect thereto).

            In the case of the 500 Sansome Office Loan (or any successor REO
Loan with respect thereto), any Appraisal Reduction Amount will be calculated in
respect of the 500 Sansome Office Total Loan (or any successor REO Loans with
respect thereto), as if it was a single Loan (or single REO Loan), and any
Appraisal Reduction Amount shall be allocated first to the 500 Sansome Office
Junior Loan (or any successor REO Loan with respect thereto), up to the
outstanding principal balance of such Junior Loan (or REO Loan), and then to the
500 Sansome Office Loan (or any successor REO Loan with respect thereto).

            In the case of any CBA A Loan (or any successor REO Loan with
respect thereto), any Appraisal Reduction Amount will be calculated in respect
of the related CBA A/B Loan Pair (or any successor REO Loans with respect
thereto), as if it was a single Loan (or a single REO Loan), and any Appraisal
Reduction Amount shall first be allocated to the related CBA B Loan (or any
successor REO Loan with respect thereto), up to the outstanding principal
balance of such Junior Loan (or REO Loan), and then any remaining portion of any
such Appraisal Reduction Amount shall be allocated to the related CBA A Loan (or
any successor REO Loan with respect thereto).

            Notwithstanding anything herein to the contrary, the aggregate
Appraisal Reduction Amount related to a Loan or any successor REO Loan with
respect thereto will be reduced to zero as of the date such Loan or such REO
Loan (or the related REO Property) is paid in full, liquidated, repurchased or
otherwise removed from the Trust Fund.

            "Appraisal Reduction Event": With respect to any Loan, the earliest
of (i) 120 days after an uncured delinquency (without regard to the application
of any grace period) occurs in respect of such Loan or any related Junior Loan
or Companion Loan (except that with respect to a Balloon Payment, such date may
extend until the Loan becomes a Specially Serviced Loan), (ii) the date on which
a reduction in the amount of Monthly Payments on such Loan, or a change in any
other material economic term of such Loan (other than an extension of the
Maturity Date for a period of six months or less), becomes effective as a result
of a modification of such Loan by the applicable Special Servicer, (iii) 60 days
after a receiver has been appointed and remains undismissed for the Borrower or
immediately after a receiver has been appointed for the related Mortgaged
Property, (iv) 30 days after a Borrower declares bankruptcy, (v) 60 days after
the Borrower has become the subject of a decree or order for a bankruptcy
proceeding that shall have remained in force undischarged and unstayed, and (vi)
immediately after such Loan becomes an REO Loan; provided, however, that there
shall be no reduction in P&I Advances if an Appraisal Reduction Event shall
occur on and after the dates when the aggregate of the Class Principal Balances
of all Classes of Sequential Pay Certificates (other than the Class A Sequential
Pay Certificates) have been reduced to zero. The Special Servicer shall notify
the Master Servicer, the Trustee and, with respect to any Loan Combination, the
related Junior Loan Holder or Companion Loan Holder, promptly upon the
occurrence of any of the foregoing events. With respect to the 3434 North
Washington Boulevard Loan, Appraisal Reduction Event shall have the meaning set
forth in the related Intercreditor Agreement, for purposes of determining
whether a change of control has occurred.

            "Appraised Value": With respect to any Mortgaged Property (other
than a residential cooperative property), the appraised value thereof (as is) as
determined by the most recent Appraisal obtained or conducted, as appropriate,
pursuant to this Agreement or obtained in connection with the origination of the
Loan, and with respect to any Mortgaged Property that is a residential
cooperative property, the value of such property as shown in the most recent
Appraisal obtained or conducted, as appropriate, pursuant to this Agreement, or
obtained in connection with the origination of the Loan, as applicable, and
determined as if such property were operated as a cooperatively-owned
multifamily residential building (generally equaling the gross sellout value of
all cooperative units in such residential cooperative property (applying a
discount as determined by the appraiser for rent regulated and rent controlled
units) plus the amount of the underlying debt encumbering such residential
cooperative property).

            "Appraiser": An Independent MAI, state certified organization with
five years of experience in properties of like kind and in the same geographic
area.

            "ARD Loan": Any Loan that is designated as such on the Mortgage Loan
Schedule.

            "Asset Status Report": As defined in Section 3.21(e).

            "Assignable Primary Servicing Fee": Any Primary Servicing Fee that
is payable to Master Servicer No. 1 or Master Servicer No. 2 or their permitted
assignee pursuant to Section 3.11(a) and subject to reduction by the Trustee
pursuant to Section 3.11(a).

            "Assignment of Leases": With respect to any Mortgaged Property, any
assignment of leases, rents and profits or similar instrument, executed by the
related Borrower, assigning to the related mortgagee all of the income, rents
and profits derived from the ownership, operation, leasing or disposition of all
or a portion of such Mortgaged Property, in the form which was duly executed,
acknowledged and delivered, as amended, modified, renewed or extended through
the date hereof and from time to time hereafter.

            "Assumed Scheduled Payment": For any Due Period shall mean the
following:

            (a) with respect to any Loan, Companion Loan or Junior Loan that is
      delinquent in respect of its Balloon Payment (and, if applicable, any
      successor REO Loan with respect thereto as to which the Balloon Payment
      would have been past due), an amount equal to the sum of (i) the principal
      portion of the Monthly Payment that would have been due on such Loan,
      Companion Loan or Junior Loan on the related Due Date based on the
      constant payment required by the related Note or the original amortization
      schedule thereof (as calculated with interest at the related Mortgage
      Rate), if applicable, assuming such Balloon Payment had not become due
      (and, if applicable, assuming the related Mortgaged Property had not
      become an REO Property), after giving effect to any modification of such
      Loan, Companion Loan or Junior Loan, and (ii) one month's interest on the
      Stated Principal Balance of such Loan or Junior Loan (or, if applicable,
      any successor REO Loan with respect thereto) as of the end of such Due
      Period at the applicable Mortgage Rate (less the related Master Servicing
      Fee Rate and Primary Servicing Fee Rate). The amount of the Assumed
      Scheduled Payment for any A Loan, Companion Loan or Junior Loan shall be
      calculated solely by reference to the terms of such A Loan, Companion Loan
      or Junior Loan, as applicable (as modified in connection with any
      bankruptcy or similar proceeding involving the related Borrower or
      pursuant to a modification, waiver or amendment thereof granted or agreed
      to by the applicable Master Servicer or the applicable Special Servicer
      pursuant to the terms hereof) and without regard to the remittance
      provisions of the related Intercreditor Agreement; and

             (b) any REO Loan that is not delinquent in respect of its Balloon
      Payment, an amount equal to the sum of (i) the principal portion of the
      Monthly Payment that would have been due on the related Loan on the
      related Due Date based on the original amortization schedule thereof (as
      calculated with interest at the related Mortgage Rate), if applicable,
      assuming the related Mortgaged Property had not become an REO Property,
      after giving effect to any modification of the related Loan, and (ii) one
      month's interest on the Stated Principal Balance of such REO Loan as of
      the end of such Due Period at the applicable Mortgage Rate.

            "Available Distribution Amount": With respect to any Distribution
Date, an amount equal to the sum (without duplication) of:

            (a) the aggregate amount received on or with respect to the Loans
      (and any related REO Properties) on or prior to the related Determination
      Date and on deposit in the respective Collection Accounts as of the close
      of business on the Business Day preceding the Master Servicer Remittance
      Date, exclusive of any portion of such aggregate amount that is comprised
      of one or more of the following amounts (without duplication):

                  (i) all Monthly Payments collected but due on a Due Date after
            the end of the related Due Period;

                  (ii) all amounts in the Collection Accounts that are payable
            or reimbursable to any Person from any such account pursuant to
            clauses (iii) through (xvii), inclusive, and clauses (xix), (xx) and
            (xxi) of Section 3.05(a);

                  (iii) all amounts that are payable or reimbursable to any
            Person from the Distribution Account pursuant to clauses (iii)
            through (vi), inclusive, of Section 3.05(b);

                  (iv) all Yield Maintenance Charges and all Static Prepayment
            Premiums;

                  (v) all amounts deposited in any Collection Account in error;

                  (vi) any net interest or net investment income on funds on
            deposit in any Collection Account or any REO Account or in Permitted
            Investments in which such funds may be invested;

                   (vii) with respect to any Distribution Date relating to each
            Interest Accrual Period ending in each February or in any January in
            a year which is not a leap year (unless, in either case, the related
            Distribution Date is the Final Distribution Date), the Withheld
            Amounts in respect of the Interest Reserve Loans that are to be
            deposited in the Interest Reserve Account on such Distribution Date
            and held for future distribution pursuant to Section 3.28;

                  (viii) all amounts received with respect to a Serviced Loan
            Combination that are required to be paid to any related Junior Loan
            Holder and/or Companion Loan Holder, as applicable, pursuant to the
            terms of the related Junior Loan and/or Companion Loan, as
            applicable, and the related Intercreditor Agreement (which amounts
            will be deposited into the related Junior Loan Custodial Account or
            Companion Loan Custodial Account pursuant to Section 3.04 and/or
            Section 3.05, and withdrawn from such accounts pursuant to Section
            3.05);

                  (ix) Excess Interest; and

                  (x) Excess Liquidation Proceeds;

            (b) if and to the extent not already included in clause (a) hereof,
      the aggregate amount transferred with respect to the REO Loans in the
      Mortgage Pool from any REO Account to any Collection Account for such
      Distribution Date pursuant to Section 3.16(c);

            (c) the aggregate amount of any P&I Advances made in respect of the
      Mortgage Pool by the Master Servicers and/or the Trustee, as applicable,
      for such Distribution Date pursuant to Section 4.03 or 7.05, which P&I
      Advances shall not include any related Master Servicing Fees, Primary
      Servicing Fees or Workout Fees;

            (d) all funds released from the Interest Reserve Account for
      distribution on such Distribution Date, and with respect to the first
      Distribution Date, the Closing Date Deposit Amount deposited into the
      Distribution Account pursuant to Section 2.01(j);

            (e) any and all payments required to be made by the Master Servicers
      pursuant to Section 3.02(e);

            (f) the aggregate amount transferred (pursuant to Section 3.05(d))
      from the Excess Liquidation Proceeds Account to the Distribution Account
      in respect of such Distribution Date; and

            (g) if and to the extent not already included in clause (a) hereof,
      any Cure Payment (except for any portion thereof payable or reimbursable
      to the applicable Master Servicer or Special Servicer), made by the
      828-850 Madison Avenue Junior Loan Holder, the 3434 North Washington
      Boulevard Junior Loan Holder or any CBA B Loan Holder pursuant to the
      terms of the related Intercreditor Agreement during the related Due Period
      and allocable to principal or interest with respect to the related Loan.

            "Balloon Loan": Any Loan, Companion Loan or Junior Loan that by its
terms provides for an amortization schedule extending materially beyond its
Maturity Date or for no amortization prior to its Maturity Date.

            "Balloon Payment": With respect to any Balloon Loan and any date of
determination, the scheduled payment of principal due on the Maturity Date of
such Balloon Loan (less principal included in the applicable amortization
schedule or scheduled Monthly Payment).

            "Bankruptcy Code": The federal Bankruptcy Code, as amended from time
to time (Title 11 of the United States Code).

            "BCRE Loan": The mortgage loan transferred to the Depositor pursuant
to the BCRE Mortgage Loan Purchase Agreement and identified on Schedule II
thereto, together with any mortgage loans substituted in replacement thereof
pursuant to the BCRE Mortgage Loan Purchase Agreement.

            "BCRE Mortgage Loan Purchase Agreement": The agreement between the
Depositor as purchaser and the BCRE Mortgage Loan Seller as seller, dated as of
September 1, 2006, relating to the transfer of all of the BCRE Mortgage Loan
Seller's right, title and interest in and to the mortgage loans identified on
Schedule II thereto.

            "BCRE Mortgage Loan Seller" or "BCRE": Barclays Capital Real Estate
Inc. and its successors in interest.

            "Base Interest Fraction": With respect to any Principal Prepayment
or other early collection of principal on any Loan (or any successor REO Loan
with respect thereto) and any of the Class A-1, Class A-1-A, Class A-2, Class
A-3, Class A-AB, Class A-M, Class -J, Class B, Class C, Class D, Class E, Class
F, Class G, Class H, Class J and Class K Certificates and the Class A-4FL
Regular Interest, a fraction (not greater than 1) (a) whose numerator is the
amount, if any, by which (i) the Pass-Through Rate on such Class of Certificates
or Class A-4FL Regular Interest exceeds (ii) the Yield Rate used in calculating
the Yield Maintenance Charge with respect to such Principal Prepayment or other
early collection of principal and (b) whose denominator is the amount, if any,
by which the (i) Mortgage Rate on such Loan (or REO Loan) exceeds (ii) the Yield
Rate (as provided by the applicable Master Servicer) used in calculating the
Yield Maintenance Charge with respect to such Principal Prepayment or other
early collection of principal; provided, however, that if such Yield Rate is
greater than or equal to the lesser of (x) the Mortgage Rate on such Loan (or
REO Loan) and (y) the Pass-Through Rate described in clause (a)(i) above, then
the Base Interest Fraction shall be zero.

            "Book-Entry Certificate": Any Certificate registered in the name of
the Depository or its nominee.

            "Book-Entry Non-Registered Certificate": Any Non-Registered
Certificate that constitutes a Book-Entry Certificate.

            "Borrower": With respect to any Loan, the obligor or obligors on any
related Note or Notes, including, without limitation, any Person that has
acquired the related Mortgaged Property and assumed the obligations of the
original obligor under the Note or Notes.

            "Breach": As defined in Section 2.03(b).

            "Broker Strip": With respect to each Broker Strip Loan, the right to
receive interest accrued on the principal balance of such Loan at the Broker
Strip Rate for such Loan.

            "Broker Strip Interest": With respect to each Broker Strip Loan,
interest accrued on the principal balance of such loan at the Broker Strip Rate
for such Loan.

            "Broker Strip Loans": The Loans listed on Exhibit M hereto.

            "Broker Strip Payee": With respect to any Broker Strip Loan, the
"Broker Strip Payee" specified on Exhibit M hereto with respect to such Loan.

            "Broker Strip Rate": With respect to each Broker Strip Loan, the
"Broker Strip Rate" specified on Exhibit M hereto with respect to such Loan.

            "Business Day": Any day other than a Saturday, a Sunday or a day on
which banking institutions in the states where any Collection Account, the
Distribution Account, the Trustee, the Certificate Administrator, any Master
Servicer or any Special Servicer are located, are authorized or obligated by law
or executive order to remain closed.

            "Cash Collateral Account": With respect to any Loan that has a
Lock-Box Account, any account or accounts created pursuant to the related
Mortgage, Loan Agreement, Cash Collateral Account Agreement or other Loan
Document, into which account or accounts the Lock-Box Account monies are swept
on a regular basis for the benefit of the Trustee as successor to the applicable
Mortgage Loan Seller's interest in such Loan. Any Cash Collateral Account shall
be beneficially owned for federal income tax purposes by the Person who is
entitled to receive all reinvestment income or gain thereon in accordance with
the terms and provisions of the related Loan and Section 3.06, which Person (and
not the Trust) may be taxed on all reinvestment income or gain thereon. The
applicable Master Servicer shall be permitted to make withdrawals therefrom
solely for deposit into a Collection Account or a Servicing Account, or to remit
to the Borrower as required by the related Loan Documents, as applicable. To the
extent not inconsistent with the terms of the related Loan, each such Cash
Collateral Account shall be an Eligible Account.

            "Cash Collateral Account Agreement": With respect to any Loan, the
cash collateral account agreement, if any, between the related Mortgage Loan
Originator and the related Borrower, pursuant to which the related Cash
Collateral Account, if any, may have been established.

            "CBA A Loan": The Loans secured by the Mortgaged Properties
identified on the Mortgage Loan Schedule as The Cottages of Fall Creek, The
Orchard Apartments, Briarwood Apartments, 833 Jackson & 322 Green, Regional
Professional Building, Pavilions Shopping Center and McKnight Retail,
respectively, each of which Loans are senior in right of payment to the related
CBA B Loan, to the extent set forth in the related CBA Intercreditor Agreement.

            "CBA A/B Loan Pair": Any CBA A Loan together with the related CBA B
Loan.

            "CBA A/B Material Default": With respect to a CBA A/B Loan Pair, a
"Material Default" under, and within the meaning of, the related Intercreditor
Agreement.

            "CBA B Loan": With respect to each CBA A Loan, the mortgage loan
secured, on a subordinate basis, by the same Mortgage on the same Mortgaged
Property as such CBA A Loan, which subordinate mortgage loan is not included in
the Trust Fund.

            "CBA B Loan Holder": With respect to any CBA A/B Loan Pair,
CBA-Mezzanine Capital Finance, LLC or its successors and assigns, as the holder
of the related CBA B Loan.

            "CBA Intercreditor Agreement": With respect to each CBA A/B Loan
Pair, the related intercreditor agreement entered into by and between the holder
of the related CBA A Loan and the related CBA B Loan Holder, as the same may be
further amended from time to time in accordance with the terms thereof.

            "CERCLA": The Comprehensive Environmental Response, Compensation and
Liability Act of 1980, as amended.

            "Certificate": Any one of the Depositor's Commercial Mortgage
Pass-Through Certificates, Series 2006-C4, as executed by the Trustee or
Certificate Registrar and authenticated and delivered hereunder by the
Certificate Registrar.

            "Certificate Administrator": LaSalle Bank National Association, and
its successor in interest.

            "Certificate Administrator Account": As defined in Section 3.06(a).

            "Certificate Administrator Report": As defined in Section 4.02(a).

            "Certificate Notional Amount": With respect to any Class A-X, Class
A-SP or Class A-Y Certificate, as of any date of determination, the then
notional amount of such Certificate equal to the product of (a) the Percentage
Interest evidenced by such Certificate, multiplied by (b) the then Class A-X,
Class A-SP or Class A-Y Notional Amount, as applicable.

            "Certificate Owner": With respect to a Book-Entry Certificate, the
Person who is the beneficial owner of such Certificate as reflected on the books
of the Depository or on the books of a Depository Participant or on the books of
an indirect participating brokerage firm for which a Depository Participant acts
as agent.

            "Certificate Principal Balance": With respect to any Sequential Pay
Certificate, as of any date of determination, the then principal balance of such
Certificate equal to the product of (a) the Percentage Interest evidenced by
such Certificate, multiplied by (b) the then Class Principal Balance of the
subject Class of Sequential Pay Certificates.

            "Certificate Register" and "Certificate Registrar": The register
maintained and the registrar appointed pursuant to Section 5.02.

            "Certificateholder" or "Holder": The Person in whose name a
Certificate is registered in the Certificate Register; provided, however, that
solely for the purposes of giving any consent, approval or waiver pursuant to
this Agreement with respect to the rights, obligations or liabilities of the
Trustee, a Master Servicer or a Special Servicer, any Certificate registered in
the name of such Trustee, Master Servicer, Special Servicer or any Affiliate of
any of them, as applicable, shall be deemed not to be outstanding, and the
Voting Rights to which it is entitled shall not be taken into account in
determining whether the requisite percentage of Voting Rights necessary to
effect any such consent, approval or waiver has been obtained; provided that (i)
such restrictions shall not apply to the selection of the Controlling Class (or
the Directing Certificateholder) or the exercise of a Special Servicer's or its
Affiliates' rights as a member of the Controlling Class and (ii) the foregoing
shall not apply if the Trustee, a Master Servicer or a Special Servicer, as the
case may be, and/or their Affiliates, own the entire Class of each Class of
Certificates affected by such action, vote, consent or waiver. The Trustee shall
be entitled to request and conclusively rely upon a certificate of a Master
Servicer or a Special Servicer in determining whether a Certificate is
registered in the name of an Affiliate of such Person. All references herein to
"Holders" or "Certificateholders" shall reflect the rights of Certificate Owners
as they may indirectly exercise such rights through the Depository and the
Depository Participants, except as otherwise specified herein; provided,
however, that the parties hereto shall be required to recognize as a "Holder" or
"Certificateholder" only the Person in whose name a Certificate is registered in
the Certificate Register.

            "Certification Parties" has the meaning set forth in Section 11.08.

             "Certifying Person" has the meaning set forth in Section 11.08.

            "Certifying Servicer" has the meaning set forth in Section 11.11.

            "Class": With respect to any Certificates or Uncertificated
Lower-Tier Interests or the Class A-4FL Regular Interest, all of the
Certificates bearing the same alphabetical and, if applicable, numerical class
designation and each designation of Uncertificated Lower-Tier Interests or the
Class A-4FL Regular Interest.

            "Class A Sequential Pay Certificate": Any Class A-1, Class A-2,
Class A-AB, Class A-3, Class A-4FL or Class A-1-A Certificate.

            "Class A-1 Certificate": A Certificate designated as "Class A-1" on
the face thereof, substantially in the form of Exhibit A-1 hereto.

            "Class A-1 Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to 4.7710%.

            "Class A-1-A Certificate": A Certificate designated as "Class A-1-A"
on the face thereof, substantially in the form of Exhibit A-1 hereto.

            "Class A-1-A Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to 5.4600%.

            "Class A-2 Certificate": A Certificate designated as "Class A-2" on
the face thereof, substantially in the form of Exhibit A-1 hereto.

            "Class A-2 Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to 5.3610%.

            "Class A-3 Certificate": A Certificate designated as "Class A-3" on
the face thereof, substantially in the form of Exhibit A-1 hereto.

            "Class A-3 Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to 5.4670%.

            "Class A-4FL Available Funds": With respect to any Distribution
Date, an amount equal to (a) the sum of (i) the total amount of all principal
and/or interest distributions, as well as all distributions of Yield Maintenance
Charges and Static Prepayment Premiums, on or in respect of the Class A-4FL
Regular Interest with respect to such Distribution Date and (ii) the amounts, if
any, received from the Swap Counterparty pursuant to the Swap Agreement for such
Distribution Date, less (b) with respect to interest amounts, the sum of (i) all
regularly scheduled interest amounts required to be paid to the Swap
Counterparty pursuant to the Swap Agreement for such Distribution Date, (ii) any
amount payable to the Certificate Administrator as Net Investment Earnings
earned on funds held in the Floating Rate Account and (iii) any amount deposited
in the Floating Rate Account in error.

             "Class A-4FL Certificate": A Certificate designated as "Class A-4FL"
on the face thereof, substantially in the form of Exhibit A-1A hereto.

            "Class A-4FL Distribution Conversion": With respect to any
Distribution Date (i) immediately upon and during the continuation of a Swap
Default of the nature described in clause (i) of the definition of "Swap
Default" while the Certificate Administrator is pursuing remedies under the Swap
Agreement pursuant to Section 3.33, or (ii) immediately upon and following the
termination of the Swap Agreement, the conversion of distributions to the Class
A-4FL Certificates from distributions based, in part, on floating interest
payments from the Swap Counterparty under the Swap Agreement to distributions
based solely on fixed interest distributions in respect of the Class A-4FL
Regular Interest, as specified in Section 4.01.

            "Class A-4FL Fixed Swap Payment": With respect to any Distribution
Date, the fixed interest amount required to be paid to the Swap Counterparty by
the Trust under the Swap Agreement (prior to any netting against amounts due
from the Swap Counterparty to the Trust) in respect of that Distribution Date.

            "Class A-4FL Floating Swap Payment": With respect to any
Distribution Date, the floating interest amount required to be paid to the Trust
by the Swap Counterparty under the Swap Agreement (prior to any netting against
amounts due from the Trust to the Swap Counterparty) in respect of that
Distribution Date.

            "Class A-4FL Interest Distribution Amount": With respect to any
Distribution Date, an amount equal to (a) the sum of (i) the Optimal Interest
Distribution Amount with respect to the Class A-4FL Regular Interest for such
Distribution Date, (ii) the Class A-4FL Floating Swap Payment received from the
Swap Counterparty with respect to such Distribution Date and (iii) if the Swap
Agreement is terminated and a replacement Swap Agreement is not obtained, any
Swap Termination Payment collected during the related Due Period, less (b) the
Class A-4FL Fixed Swap Payment made to the Swap Counterparty with respect to
such Distribution Date.

            "Class A-4FL Net Fixed Swap Payment": With respect to any
Distribution Date, the excess, if any of (i) the Class A-4FL Fixed Swap Payment
for that Distribution Date over (ii) the Class A-4FL Floating Swap Payment in
respect of that Distribution Date.

            "Class A-4FL Net Floating Swap Payment": With respect to any
Distribution Date, the excess, if any of (i) the Class A-4FL Floating Swap
Payment for that Distribution Date over (ii) the Class A-4FL Fixed Swap Payment
in respect of that Distribution Date.

            "Class A-4FL Pass-Through Rate": With respect to any Distribution
Date, LIBOR plus 0.1800%; except that if (a) the total amount of interest
distributions with respect to the Class A-4FL Regular Interest for any
distribution date deposited in the Floating Rate Account is less than (b) 1/12th
of the product of (i) 5.4680%, multiplied by (ii) the Class Principal Balance of
the Class A-4FL Regular Interest immediately prior to that Distribution Date,
then there will be a proportionate reduction to the amount of interest
distributable on the Class A-4FL Certificates, as provided in the Swap
Agreement.

             "Class A-4FL Principal Distribution Amount": With respect to any
Distribution Date, an amount equal to the amount of principal allocated pursuant
to Section 4.01 in respect of the Class A-4FL Regular Interest on such
Distribution Date.

            "Class A-4FL Regular Interest": The uncertificated interest in REMIC
II, designated as "Class A-4FL," constituting a "regular interest" in REMIC II
for purposes of the REMIC Provisions and having the characteristics attributable
thereto in this Agreement.

             "Class A-4FL Regular Interest Pass-Through Rate": As to any
Distribution Date, a per annum rate equal to 5.4680%.

            "Class A-4FL Swap Payment Date": With respect to any Distribution
Date, the Business Day preceding such Distribution Date.

            "Class A-AB Certificate": A Certificate designated as "Class A-AB"
on the face thereof, substantially in the form of Exhibit A-1 hereto.

            "Class A-AB Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to 5.4390%.

            "Class A-M Certificate": A Certificate designated as "Class A-M" on
the face thereof, substantially in the form of Exhibit A-1 hereto.

            "Class A-M Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to 5.5090%.

            "Class A-J" Certificate": A Certificate designated as "Class A-J" on
the face thereof, substantially in the form of Exhibit A-2 hereto.

            "Class A-J Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.5380% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class A-SP Certificate": A Certificate designated as "Class A-SP"
on the face thereof, substantially in the form of Exhibit A-2 hereto.

            "Class A-SP Component": Any of Component A-1-2, Component A-2-1,
Component A-2-2, Component A-3-1, Component A-3-2, Component A-3-3, Component
A-3-4, Component A-3-5, Component A-4FL, Component A-AB-1, Component A-AB-2,
Component A-1-A-2, Component A-1-A-3, Component A-1-A-4, Component A-1-A-5,
Component A-1-A-6, Component A-1-A-7, Component A-1-A-8, Component A-M,
Component A-J, Component B, Component C-1, Component C-2, Component D-1,
Component D-2, Component E, Component F-1, Component F-2, Component G, Component
H-1 and Component H-2.

            "Class A-SP Notional Amount": With respect to the Class A-SP
Certificates, as of any date of determination, the sum of then Component
Notional Amounts of all of the Class A-SP Components.

             "Class A-SP Pass-Through Rate": As to any Distribution Date, the per
annum rate, expressed as a percentage, equal to the weighted average of the
respective Class A-SP Strip Rates of the Class A-SP Components for (and weighted
on the basis of their respective Component Notional Balances immediately prior
to) such Distribution Date.

            "Class A-SP Strip Rate": With respect to each of the Class A-SP
Components for any Distribution Date, a rate per annum equal to (i) for any
Distribution Date occurring on or before the related Component Crossover Date,
(x) the lesser of (I) the Weighted Average Net Mortgage Rate for such
Distribution Date and (II) the Reference Rate for such Distribution Date minus
(y) the Pass-Through Rate for the Corresponding Certificates (provided that in
no event shall any Class A-SP Strip Rate be less than zero), and (ii) for any
Distribution Date occurring after the related Component Crossover Date, 0% per
annum.

            "Class A-X Certificate": A Certificate designated as "Class A-X" on
the face thereof, substantially in the form of Exhibit A-2 hereto.

            "Class A-X Component": Each of the Components.

            "Class A-X Notional Amount": With respect to the Class A-X
Certificates, as of any date of determination, the sum of then Component
Notional Amounts of all of the Class A-X Components.

            "Class A-X Pass-Through Rate": As to any Distribution Date, the per
annum rate, expressed as a percentage, equal to the weighted average of the
respective Class A-X Strip Rates of the Class A-X Components for (and weighted
on the basis of their respective Component Notional Balances immediately prior
to) such Distribution Date.

            "Class A-X Strip Rate": With respect to any Class A-X Component
(other than the Class A-SP Components) for any Distribution Date, a rate per
annum equal to (i) the Weighted Average Net Mortgage Rate for such Distribution
Date, minus (ii) the Pass-Through Rate for the Corresponding Certificates, and
in the case of Class A-SP Components, (A) for any Distribution Date occurring on
or before the related Component Crossover Date, (x) the Weighted Average Net
Mortgage Rate for such Distribution Date minus (y) the sum of the Pass-Through
Rate for the Corresponding Certificates for such Distribution Date and the Class
A-SP Strip Rate for such Component for such Distribution Date, and (B) for any
Distribution Date occurring after the related Component Crossover Date, a rate
per annum equal to (x) the Weighted Average Net Mortgage Rate for such
Distribution Date, minus (y) the Pass-Through Rate for the Corresponding
Certificates (provided, that in no event shall any Class A-X Strip Rate be less
than zero).

            "Class A-Y Certificate": A Certificate designated as "Class A-Y" on
the face thereof, substantially in the form of Exhibit A-2 hereto.

            "Class A-Y Notional Amount": With respect to the Class A-Y
Certificates, as of any date of determination, the then aggregate Stated
Principal Balance of the Specially Designated Co-op Loans and any successor REO
Loans with respect thereto.

            "Class A-Y Pass-Through Rate": As to any Distribution Date, the per
annum rate, expressed as a percentage, equal to the weighted average of the
respective Class A-Y Strip Rates of the Specially Designated Co-op Loans and any
successor REO Loans with respect thereto for (and weighted on the basis of their
respective Stated Principal Balances immediately prior to) such Distribution
Date.

            "Class A-Y Strip Rate": With respect to any Specially Designated
Co-op Loan (and any successor REO Loan with respect thereto), for any
Distribution Date, a rate per annum equal to either: (1) if such Loan accrues
interest on a 30/360 Basis, 0.10%; and (2) if such Loan accrues interest on an
Actual/360 Basis, the product of (a) 0.10%, multiplied by (b) a fraction, the
numerator of which is the number of days in the Interest Accrual Period that
corresponds to such Distribution Date, and the denominator of which 30.

            "Class B Certificate": A Certificate designated as "Class B" on the
face thereof, substantially in the form of Exhibit A-1 hereto.

            "Class B Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.5680% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class C Certificate": A Certificate designated as "Class C" on the
face thereof, substantially in the form of Exhibit A-1 hereto.

            "Class C Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.5220% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class D Certificate": A Certificate designated as "Class D" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class D Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.6170% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class E Certificate": A Certificate designated as "Class E" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class E Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.6470% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class F Certificate": A Certificate designated as "Class F" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class F Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.6670% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class G Certificate": A Certificate designated as "Class G" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class G Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.7260% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class H Certificate": A Certificate designated as "Class H" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class H Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.9130% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class J Certificate": A Certificate designated as "Class J" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class J Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 6.0120% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class K Certificate": A Certificate designated as "Class K" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class K Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the Weighted Average Net Mortgage Pass-Through Rate for such
Distribution Date.

            "Class L Certificate": A Certificate designated as "Class L" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class L Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.1480% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class LA-1-1 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-1-2 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-1-A-1 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-1-A-2 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-1-A-3 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-1-A-4 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-1-A-5 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

             "Class LA-1-A-6 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-1-A-7 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-1-A-8 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-2-1 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-2-2 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-3-1 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-3-2 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-3-3 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-3-4 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-3-5 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-4FL Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-AB-1 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-AB-2 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-M Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-J Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LA-Y Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Notional Balance and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LB Lower-Tier Interest": A regular interest in the Lower-Tier
REMIC that is held as an asset of the Upper-Tier REMIC, has the Original
Lower-Tier Principal Amount and per annum rate of interest set forth in the
Preliminary Statement hereto.

            "Class LC-1 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LC-2 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LD-1 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LD-2 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LE Lower-Tier Interest": A regular interest in the Lower-Tier
REMIC that is held as an asset of the Upper-Tier REMIC, has the Original
Lower-Tier Principal Amount and per annum rate of interest set forth in the
Preliminary Statement hereto.

            "Class LF-1 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LF-2 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LG Lower-Tier Interest": A regular interest in the Lower-Tier
REMIC that is held as an asset of the Upper-Tier REMIC, has the Original
Lower-Tier Principal Amount and per annum rate of interest set forth in the
Preliminary Statement hereto.

            "Class LH-1 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LH-2 Lower-Tier Interest": A regular interest in the
Lower-Tier REMIC that is held as an asset of the Upper-Tier REMIC, has the
Original Lower-Tier Principal Amount and per annum rate of interest set forth in
the Preliminary Statement hereto.

            "Class LJ Lower-Tier Interest": A regular interest in the Lower-Tier
REMIC that is held as an asset of the Upper-Tier REMIC, has the Original
Lower-Tier Principal Amount and per annum rate of interest set forth in the
Preliminary Statement hereto.

            "Class LK Lower-Tier Interest": A regular interest in the Lower-Tier
REMIC that is held as an asset of the Upper-Tier REMIC, has the Original
Lower-Tier Principal Amount and per annum rate of interest set forth in the
Preliminary Statement hereto.

            "Class LL Lower-Tier Interest": A regular interest in the Lower-Tier
REMIC that is held as an asset of the Upper-Tier REMIC, has the Original
Lower-Tier Principal Amount and per annum rate of interest set forth in the
Preliminary Statement hereto.

            "Class LM Lower-Tier Interest": A regular interest in the Lower-Tier
REMIC that is held as an asset of the Upper-Tier REMIC, has the Original
Lower-Tier Principal Amount and per annum rate of interest set forth in the
Preliminary Statement hereto.

            "Class LN Lower-Tier Interest": A regular interest in the Lower-Tier
REMIC that is held as an asset of the Upper-Tier REMIC, has the Original
Lower-Tier Principal Amount and per annum rate of interest set forth in the
Preliminary Statement hereto.

            "Class LO Lower-Tier Interest": A regular interest in the Lower-Tier
REMIC that is held as an asset of the Upper-Tier REMIC, has the Original
Lower-Tier Principal Amount and per annum rate of interest set forth in the
Preliminary Statement hereto.

            "Class LP Lower-Tier Interest": A regular interest in the Lower-Tier
REMIC that is held as an asset of the Upper-Tier REMIC, has the Original
Lower-Tier Principal Amount and per annum rate of interest set forth in the
Preliminary Statement hereto.

             "Class M Certificate": A Certificate designated as "Class M" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class M Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.1480% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class N Certificate": A Certificate designated as "Class N" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class N Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.1480% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class Notional Amount": For any date of determination, the Class
A-X Notional Amount or the Class A-Y Notional Amount, as applicable.

            "Class O Certificate": A Certificate designated as "Class O" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class O Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.1480% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class P Certificate": A Certificate designated as "Class P" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class P Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.1480% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class Q Certificate": A Certificate designated as "Class Q" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class Q Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.1480% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class S Certificate": A Certificate designated as "Class S" on the
face thereof, substantially in the form of Exhibit A-3 hereto.

            "Class S Pass-Through Rate": As to any Distribution Date, a per
annum rate equal to the lesser of (i) 5.1480% and (ii) the Weighted Average Net
Mortgage Pass-Through Rate for such Distribution Date.

            "Class Principal Balance": With respect to any Class of Sequential
Pay Certificates, as of any date of determination, a principal amount equal to
the Original Class Principal Balance of such Class as specified in the
Preliminary Statement hereto, as such principal amount may be permanently
reduced (to not less than zero) on each Distribution Date coinciding with or
preceding such date of determination by (i) any distributions of principal made
with respect to such Class of Sequential Pay Certificates on the subject
Distribution Date pursuant to Section 4.01(a) and (ii) any Collateral Support
Deficit allocated to such Class of Sequential Pay Certificates on the subject
Distribution Date pursuant to Section 4.04.

            "Class R Certificate": A Certificate designated as "Class R" on the
face thereof, substantially in the form of Exhibit A-5 hereto.

            "Class V Certificate": A Certificate designated as "Class V" on the
face thereof, substantially in the form of Exhibit A-4 hereto. The Class V
Certificates have no Pass-Through Rate, Class Principal Balance or Class
Notional Amount.

            "Clearstream": Clearstream Banking, Luxembourg, or any successor.

            "Closing Date": September 28, 2006.

            "Closing Date Deposit Amount": $305,071, representing the aggregate
amount of interest that would have accrued at the related Net Mortgage Rates
during the Collection Period ending in October 2006 for those Mortgage Loans
that do not have their first Monthly Payment due until October 2006.

             "CMSA": The Commercial Mortgage Securities Association, or any
association or organization that is a successor thereto. If neither such
association nor any successor remains in existence, "CMSA" shall be deemed to
refer to such other association or organization as may exist whose principal
membership consists of servicers, trustees, issuers, placement agents and
underwriters generally involved in the commercial mortgage loan securitization
industry, which is the principal such association or organization in the
commercial mortgage loan securitization industry and one of whose principal
purposes is the establishment of industry standards for reporting
transaction-specific information relating to commercial mortgage pass-through
certificates and commercial mortgage-backed bonds and the commercial mortgage
loans and foreclosed properties underlying or backing them to investors holding
or owning such certificates or bonds, and any successor to such other
association or organization. If an organization or association described in one
of the preceding sentences of this definition does not exist, "CMSA" shall be
deemed to refer to such other association or organization as shall be selected
by the Master Servicers, jointly, and reasonably acceptable to the Trustee, the
Certificate Administrator, the Special Servicers and the Directing
Certificateholder.

            "CMSA Advance Recovery Report": A report substantially in the form
of, and containing the information called for in, the downloadable form of the
"Advance Recovery Report" available as of the Closing Date on the CMSA Website,
or such other form for the presentation of such information and containing such
additional information as may from time to time be recommended by the CMSA for
commercial mortgage-backed securities transactions generally.

            "CMSA Bond Level File": A data file substantially in the form of,
and containing the information called for in, the downloadable form of the "Bond
Level File" available as of the Closing Date on the CMSA Website, or such other
form for the presentation of such information and containing such additional
information as may from time to time be recommended by the CMSA for commercial
mortgage-backed securities transactions generally (unless the Directing
Certificateholder and the Rating Agencies otherwise consent to an alternative
form of such report).

            "CMSA Collateral Summary File": A data file substantially in the
form of, and containing the information called for in, the downloadable form of
the "Collateral Summary File" available as of the Closing Date on the CMSA
Website, or such other form for the presentation of such information and
containing such additional information as may from time to time be recommended
by the CMSA for commercial mortgage-backed securities transactions generally
(unless the Directing Certificateholder and the Rating Agencies otherwise
consent to an alternative form of such report).

            "CMSA Comparative Financial Status Report": A report substantially
in the form of, and containing the information called for in, the downloadable
form of the "Comparative Financial Status Report" available as of the Closing
Date on the CMSA Website, or such other form for the presentation of such
information and containing such additional information as may from time to time
be recommended by the CMSA for commercial mortgage-backed securities
transactions generally (unless the Directing Certificateholder and the Rating
Agencies otherwise consent to an alternative form of such report).

            "CMSA Delinquent Loan Status Report": A report substantially in the
form of, and containing the information called for in, the downloadable form of
the "Delinquent Loan Status Report" available as of the Closing Date on the CMSA
Website, or such other form for the presentation of such information and
containing such additional information as may from time to time be reasonably
recommended by the CMSA for commercial mortgage-backed securities transactions
generally (unless the Directing Certificateholder and the Rating Agencies
otherwise consent to an alternative form of such report).

            "CMSA Financial File": A data file substantially in the form of, and
containing the information called for in, the downloadable form of the
"Financial File" available as of the Closing Date on the CMSA Website, or such
other form for the presentation of such information and containing such
additional information as may from time to time be recommended by the CMSA for
commercial mortgage-backed securities transactions generally (unless the
Directing Certificateholder and the Rating Agencies otherwise consent to an
alternative form of such report).

            "CMSA Historical Loan Modification and Corrected Mortgage Loan
Report": A report substantially in the form of, and containing the information
called for in, the downloadable form of the "Historical Loan Modification and
Corrected Mortgage Loan Report" available as of the Closing Date on the CMSA
Website, or such other form for the presentation of such information and
containing such additional information as may from time to time be recommended
by the CMSA for commercial mortgage-backed securities transactions generally
(unless the Directing Certificateholder and the Rating Agencies otherwise
consent to an alternative form of such report).

            "CMSA Investor Reporting Package":

            (a) the following seven electronic files: (i) CMSA Loan Setup File,
      (ii) CMSA Loan Periodic Update File, (iii) CMSA Property File, (iv) CMSA
      Bond Level File, (v) CMSA Financial File, (vi) CMSA Collateral Summary
      File and (vii) CMSA Special Servicer Loan File;

            (b) the following twelve supplemental reports: (i) CMSA Delinquent
      Loan Status Report, (ii) CMSA Historical Loan Modification and Corrected
      Mortgage Loan Report, (iii) CMSA REO Status Report, (iv) CMSA Loan Level
      Reserve/LOC Report, (v) CMSA Comparative Financial Status Report, (vi)
      CMSA Servicer Watch List, (vii) CMSA Operating Statement Analysis Report,
      (viii) CMSA NOI Adjustment Worksheet, (ix) CMSA Reconciliation of Funds,
      (x) CMSA Realized Loss Report, (xi) CMSA Total Loan Report and (xii) the
      CMSA Advance Recovery Report; and

            (c) such other reports and data files as CMSA may designate as part
      of the "CMSA Investor Reporting Package" from time to time generally;

provided that, in the case of each Mortgaged Property securing a Co-op Loan, the
respective files and reports comprising the CMSA Investor Reporting Package
shall present the Projected Net Cash Flow for such Mortgaged Property and the
Debt Service Coverage Ratio for such Co-op Loan, as such terms apply to
residential cooperative properties, if and to the extent that such file or
report requires preparation and/or submission of data concerning net cash flow
or debt service coverage.

            "CMSA Loan Level Reserve/LOC Report": A report substantially in the
form of, and containing the information called for in, the downloadable form of
the "Loan Level Reserve/LOC Report" on the CMSA Website, or in such other form
for the presentation of such information and containing such additional
information as may from time to time be recommended by the CMSA for commercial
mortgage-backed securities transactions generally (unless the Directing
Certificateholder and the Rating Agencies otherwise consent to an alternative
form of such report).

            "CMSA Loan Periodic Update File": A data file substantially in the
form of, and containing the information called for in, the downloadable form of
the "Loan Periodic Update File" available as of the Closing Date on the CMSA
Website, or such other form for the presentation of such information and
containing such additional information as may from time to time be recommended
by the CMSA for commercial mortgage-backed securities transactions generally
(unless the Directing Certificateholder and the Rating Agencies otherwise
consent to an alternative form of such report).

            "CMSA Loan Setup File": A data file substantially in the form of,
and containing the information called for in, the downloadable form of the "Loan
Setup File" available as of the Closing Date on the CMSA Website, or such other
form for the presentation of such information and containing such additional
information as may from time to time be recommended by the CMSA for commercial
mortgage-backed securities transactions generally (unless the Directing
Certificateholder and the Rating Agencies otherwise consent to an alternative
form of such report).

            "CMSA NOI Adjustment Worksheet": A report substantially in the form
of, and containing the information called for in, the downloadable form of the
"NOI Adjustment Worksheet" available as of the Closing Date on the CMSA Website,
or such other form for the presentation of such information and containing such
additional information as may from time to time be recommended by the CMSA for
commercial mortgage-backed securities transactions generally (unless the
Directing Certificateholder and the Rating Agencies otherwise consent to an
alternative form of such report), and in any event, shall present the
computations made in accordance with the methodology described in such form to
"normalize" the full year net operating income or net cash flow, as applicable,
and debt service coverage numbers used in the other reports required by this
Agreement.

            "CMSA Operating Statement Analysis Report": A report substantially
in the form of, and containing the information called for in, the downloadable
form of the "Operating Statement Analysis Report" available as of the Closing
Date on the CMSA Website or in such other form for the presentation of such
information and containing such additional information as may from time to time
be recommended by the CMSA for commercial mortgage-backed securities
transactions generally (unless the Directing Certificateholder and the Rating
Agencies otherwise consent to an alternative form of such report).

            "CMSA Property File": A data file substantially in the form of, and
containing the information called for in, the downloadable form of the "Property
File" available as of the Closing Date on the CMSA Website, or such other form
for the presentation of such information and containing such additional
information as may from time to time be recommended by the CMSA for commercial
mortgage-backed securities transactions generally (unless the Directing
Certificateholder and the Rating Agencies otherwise consent to an alternative
form of such report).

            "CMSA Realized Loss Report": A template substantially in the form
of, and containing the information called for in, the downloadable form of the
"Realized Loss Report" available as of the Closing Date on the CMSA Website, or
such other form for the presentation of such information and containing such
additional information as may from time to time be recommended by the CMSA for
commercial mortgage-backed securities transactions generally.

            "CMSA Reconciliation of Funds": A report substantially in the form
of, and containing the information called for in, the downloadable form of the
"Reconciliation of Funds" available as of the Closing Date on the CMSA Website,
or in such other form for the presentation of such information and containing
such additional information as may from time to time be recommended by the CMSA
for commercial mortgage-backed securities transactions generally.

            "CMSA REO Status Report": A report substantially in the form of, and
containing the information called for in, the downloadable form of the "REO
Status Report" available as of the Closing Date on the CMSA Website, or such
other form for the presentation of such information and containing such
additional information as may from time to time be recommended by the CMSA for
commercial mortgage-backed securities transactions generally (unless the
Directing Certificateholder and the Rating Agencies otherwise consent to an
alternative form of such report).

            "CMSA Servicer Watch List": A report substantially in the form of,
and containing the information called for in, the downloadable form of the
"Servicer Watch List" available as of the Closing Date on the CMSA Website, or
such other form for the presentation of such information and containing such
additional information as may from time to time be recommended by the CMSA for
commercial mortgage-backed securities transactions generally (unless the
Directing Certificateholder and the Rating Agencies otherwise consent to an
alternative form of such report).

            "CMSA Special Servicer Loan File": A data file substantially in the
form of, and containing the information called for in, the downloadable form of
the "Special Servicer Loan File" available as of the Closing Date on the CMSA
Website, or in such other form for the presentation of such information and
containing such additional information as may from time to time be recommended
by the CMSA for commercial mortgage-backed securities transactions generally
(unless the Directing Certificateholder and the Rating Agencies otherwise
consent to an alternative form of such report).

            "CMSA Total Loan Report": A report substantially in the form of, and
containing the information called for in, the downloadable form of the "CMSA
Total Loan Report" available as of the Closing Date on the CMSA Website, or such
other form for the presentation of such information and containing such
additional information as may from time to time be approved by the CMSA for
commercial mortgage securities transactions generally.

            "CMSA Website": The CMSA's Website located at "www.cmbs.org" or such
other primary website as the CMSA may establish for dissemination of its report
forms.

            "Code": The Internal Revenue Code of 1986 and regulations
promulgated thereunder, including proposed regulations to the extent that, by
reason of their proposed effective date, could, as of the date of any
determination or opinion as to the tax consequences of any action or proposed
action or transaction, be applied to the Trust or the Certificates.

            "Collateral Support Deficit": As defined in Section 4.04.

            "Collection Account": One or more separate custodial accounts or,
subject to Section 3.04(j), sub-accounts created and maintained by each Master
Servicer or any Sub-Servicer on behalf of such Master Servicer pursuant to
Section 3.04(a) in the name of the Trustee on behalf of the Certificateholders
and any related Junior Loan Holder(s) (other than a CBA B Loan Holder) or any
Companion Loan Holder and, with respect to any CBA A/B Loan Pair after the
occurrence of a CBA A/B Material Default, on behalf of the related CBA B Loan
Holder, as applicable, as their interests may appear, into which the amounts set
forth in Section 3.04(a) shall be deposited directly, which account shall,
subject to Section 3.04(j), be entitled substantially as follows: "[name of
subject Master Servicer], in trust for [name of Trustee], as Trustee for the
benefit of Holders of Credit Suisse First Boston Mortgage Securities Corp.,
Commercial Mortgage Pass-Through Certificates, Series 2006-C4, and each related
Junior Loan Holder or Companion Loan Holder, as applicable, as their interests
appear, Collection Account." Any such account or accounts or, subject to Section
3.04(j), sub-accounts shall be an Eligible Account and shall be part of the
Lower-Tier REMIC (except with respect to collections on the 828-850 Madison
Avenue Loan, which shall be part of the 828-850 Madison Avenue Loan REMIC).

            "Column Performance Guarantee": The Guarantee dated as of September
28, 2006, from the Column Performance Guarantor in favor of the Trustee,
relating to the obligations of the CSMC Mortgage Loan Seller under Section 7 of
the CSMC Mortgage Loan Purchase Agreement.

             "Column Performance Guarantor": Credit Suisse USA Inc., its
successor in interest or any successor guarantor under the Column Performance
Guarantee.

            "Commission": The Securities and Exchange Commission.

            "Companion Loan" or "280 Park Avenue Companion Loan": With respect
to the 280 Park Avenue Total Loan, the pari passu portion of such loan evidenced
by Note A-2 in the amount of $140,000,000, which is not included in the Trust.
The 280 Park Avenue Companion Loan is not a "Loan."

            "Companion Loan Custodial Account": Each of the custodial
sub-account(s) of the Collection Account (which are not included in the Trust)
created and maintained by the applicable Master Servicer pursuant to Section
3.04 on behalf of the holder of a Companion Loan. Each such sub-account shall be
maintained as a sub-account of an Eligible Account.

            "Companion Loan Holder": Any holder of the Companion Loan.

            "Companion Loan Securities": Any class of securities backed, wholly
or partially, by the 280 Park Avenue Companion Loan.

            "Component": Any of the components of the Class A-X Certificates or
the Class A-SP Certificates, which components are the respective Components
listed below.

            "Component A-1-1": One of the 42 components of the Class A-X
Certificates having a Component Notional Amount equal to the then current
Lower-Tier Principal Amount of the Class LA-1-1 Lower-Tier Interest as of any
date of determination.

            "Component A-1-2": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-1-2 Lower-Tier Interest as of any date of determination.

            "Component A-2-1": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-2-1 Lower-Tier Interest as of any date of determination.

            "Component A-2-2": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-2-2 Lower-Tier Interest as of any date of determination.

            "Component A-3-1": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-3-1 Lower-Tier Interest as of any date of determination.

            "Component A-3-2": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-3-2 Lower-Tier Interest as of any date of determination.

            "Component A-3-3": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-3-3 Lower-Tier Interest as of any date of determination.

            "Component A-3-4": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-3-4 Lower-Tier Interest as of any date of determination.

            "Component A-3-5": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-3-5 Lower-Tier Interest as of any date of determination.

            "Component A-4FL": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-4FL Lower-Tier Interest as of any date of determination.

            "Component A-AB-1": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-AB-1 Lower-Tier Interest as of any date of determination.

             "Component A-AB-2": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-AB-2 Lower-Tier Interest as of any date of determination.

            "Component A-1-A-1": One of the 42 components of the Class A-X
Certificates having a Component Notional Amount equal to the then current
Lower-Tier Principal Amount of the Class LA-1-A-1 Lower-Tier Interest as of any
date of determination.

            "Component A-1-A-2": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-1-A-2 Lower-Tier Interest as of any date of
determination.

            "Component A-1-A-3": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-1-A-3 Lower-Tier Interest as of any date of
determination.

            "Component A-1-A-4": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-1-A-4 Lower-Tier Interest as of any date of
determination.

            "Component A-1-A-5": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-1-A-5 Lower-Tier Interest as of any date of
determination.

            "Component A-1-A-6": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-1-A-6 Lower-Tier Interest as of any date of
determination.

            "Component A-1-A-7": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-1-A-7 Lower-Tier Interest as of any date of
determination.

            "Component A-1-A-8": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-1-A-8 Lower-Tier Interest as of any date of
determination.

            "Component A-J": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-J Lower-Tier Interest as of any date of determination.

            "Component A-M": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LA-M Lower-Tier Interest as of any date of determination.

            "Component B": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LB Lower-Tier Interest as of any date of determination.

            "Component C-1": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LC-1 Lower-Tier Interest as of any date of determination.

            "Component C-2": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LC-2 Lower-Tier Interest as of any date of determination.

            "Component Crossover Date": With respect to each Class A-SP
Component, the related Crossover Date as set forth in the table below:

Class A-SP Component                           Component Crossover Date
-------------------------------------------    ----------------------------------
Components A-1-2, A-2-1 and A-1-A-2            September 2007 Distribution Date
Components A-2-2, A-AB-1 and A-1-A-3           September 2008 Distribution Date
Components A-3-1, A-AB-2, A-1-A-4 and H-1      September 2009 Distribution Date
Components A-3-2, A-1-A-5, F-1, G and H-2      September 2010 Distribution Date
Components A-3-3, A-1-A-6, D-1, E and F-2      September 2011 Distribution Date
Components A-3-4, A-1-A-7, C-1 and D-2         September 2012 Distribution Date
Components A-3-5, A-4FL, A-M, A-1-A-8,
A-J, B and C-2                                  September 2013 Distribution Date

            "Component D-1": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LD-1 Lower-Tier Interest as of any date of determination.

            "Component D-2": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LD-2 Lower-Tier Interest as of any date of determination.

            "Component E": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LE Lower-Tier Interest as of any date of determination.

            "Component F-1": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LF-1 Lower-Tier Interest as of any date of determination.

            "Component F-2": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LF-2 Lower-Tier Interest as of any date of determination.

            "Component G": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LG Lower-Tier Interest as of any date of determination.

            "Component H-1": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LH-1 Lower-Tier Interest as of any date of determination.

            "Component H-2": One of the 42 components of the Class A-X
Certificates and one of the 31 components of the Class A-SP Certificates having
a Component Notional Amount equal to the then current Lower-Tier Principal
Amount of the Class LH-2 Lower-Tier Interest as of any date of determination.

            "Component J": One of the 42 components of the Class A-X
Certificates having a Component Notional Amount equal to the then current
Lower-Tier Principal Amount of the Class LJ Lower-Tier Interest as of any date
of determination.

            "Component K": One of the 42 components of the Class A-X
Certificates having a Component Notional Amount equal to the then current
Lower-Tier Principal Amount of the Class LK Lower-Tier Interest as of any date
of determination.

            "Component L": One of the 42 components of the Class A-X
Certificates having a Component Notional Amount equal to the then current
Lower-Tier Principal Amount of the Class LL Lower-Tier Interest as of any date
of determination.

            "Component M": One of the 42 components of the Class A-X
Certificates having a Component Notional Amount equal to the then current
Lower-Tier Principal Amount of the Class LM Lower-Tier Interest as of any date
of determination.

            "Component N": One of the 42 components of the Class A-X
Certificates having a Component Notional Amount equal to the then current
Lower-Tier Principal Amount of the Class LN Lower-Tier Interest as of any date
of determination.

            "Component O": One of the 42 components of the Class A-X
Certificates having a Component Notional Amount equal to the then current
Lower-Tier Principal Amount of the Class LO Lower-Tier Interest as of any date
of determination.

            "Component P": One of the 42 components of the Class A-X
Certificates having a Component Notional Amount equal to the then current
Lower-Tier Principal Amount of the Class LP Lower-Tier Interest as of any date
of determination.

            "Component Q": One of the 42 components of the Class A-X
Certificates having a Component Notional Amount equal to the then current
Lower-Tier Principal Amount of the Class LQ Lower-Tier Interest as of any date
of determination.

            "Component S": One of the 42 components of the Class A-X
Certificates having a Component Notional Amount equal to the then current
Lower-Tier Principal Amount of the Class LS Lower-Tier Interest as of any date
of determination.

            "Component Notional Amount": With respect to each Component and any
date of determination, an amount equal to the then Lower-Tier Principal Amount
of its Corresponding Uncertificated Lower-Tier Interest.

             "Controlling Class": As of any date of determination, the most
subordinate Class of Sequential Pay Certificates then outstanding that has a
Class Principal Balance at least equal to 25% of the initial Class Principal
Balance of such Class; or, if no such Class exists, the most subordinate Class
of Sequential Pay Certificates then outstanding that has a Class Principal
Balance greater than zero. As of the Closing Date, the Controlling Class shall
be the Class S Certificates. For purposes of this definition, the respective
Classes of the Class A Sequential Pay Certificates shall be treated as a single
Class and, if appropriate under the terms of this definition, shall collectively
constitute the Controlling Class.

            "Controlling Class Certificateholder": Each Holder (or Certificate
Owner, if applicable) of a Certificate of the Controlling Class as certified by
the Certificate Registrar to the Trustee from time to time.

            "Co-op Loan": Any Loan that, as of the date it is first included in
the Trust Fund, is secured by a Mortgage that encumbers a residential
cooperative property, as identified on the Mortgage Loan Schedule.

            "Corporate Trust Office": The corporate trust office of (i) the
Trustee is located at 9062 Old Annapolis Road, Columbia, Maryland 21045-1951 or
(ii) the Certificate Administrator is located at 135 South LaSalle Street, Suite
1625, Chicago, Illinois 60603, Attention: Global Securities and Trust Services,
CSFB 2006-C4.

            "Corrected Loan": Any Specially Serviced Loan that has become
current and remained current for three consecutive Monthly Payments (for such
purposes taking into account any modification or amendment of the subject Loan,
Companion Loan or any Junior Loan, as the case may be) and as to which Loan or
Junior Loan, as the case may be, the Special Servicer has returned servicing to
the Master Servicer pursuant to Section 3.21(a).

            "Corresponding Certificates": As defined in the Preliminary
Statement hereto.

            "Corresponding Components": As defined in the Preliminary Statement
hereto.

            "Corresponding Uncertificated REMIC I Interests": As defined in the
Preliminary Statement hereto.

            "Crossed Group": Any group of Loans that is cross-defaulted and
cross-collateralized with each other.

            "Crossed Loan": Any Loan which is cross-defaulted and
cross-collateralized with any other Loan.

            "Crossed Loan Repurchase Criteria": (i) The Debt Service Coverage
Ratio for all related Crossed Loans remaining in the Trust Fund for the four
calendar quarters immediately preceding the repurchase or substitution is not
less than the greater of (a) the Debt Service Coverage Ratio for all such
related Crossed Loans, together with the affected Crossed Loan, for the four
calendar quarters immediately preceding the repurchase or substitution and (b)
1.25x, (ii) the Loan-to-Value Ratio for any related Crossed Loans remaining in
the Trust Fund determined at the time of repurchase or substitution based upon
an Appraisal obtained by the Special Servicer at the expense of the related
Responsible Party is not greater than the least of (a) the Loan-to-Value Ratio
for all such related Crossed Loans, together with the affected Crossed Loan, as
set forth in the tables on Exhibit A-1 to the Prospectus Supplement, (b) the
Loan-to-Value Ratio for all such related Crossed Loans, together with the
affected Crossed Loan, determined at the time of repurchase or substitution
based upon an Appraisal obtained by the applicable Special Servicer at the
expense of the related Responsible Party and (c) 75%, and (iii) the Trustee and
the Certificate Administrator receive an Opinion of Counsel (at the expense of
the related Responsible Party) to the effect that such repurchase or
substitution will not result in the imposition of a tax on the Trust Fund or its
assets, income or gain, cause the remaining Crossed Loans to have been
significantly modified under the REMIC Provisions or cause any Trust REMIC to
fail to qualify as a REMIC for federal or applicable state tax purposes at any
time that any of the Certificates are outstanding.

            "CSMC Loans": The mortgage loans transferred to the Depositor
pursuant to the CSMC Mortgage Loan Purchase Agreement and identified on Schedule
II thereto, together with any mortgage loans substituted in replacement thereof
pursuant to the CSMC Mortgage Loan Purchase Agreement.

            "CSMC Mortgage Loan Purchase Agreement": The agreement between the
Depositor as purchaser and the CSMC Mortgage Loan Seller as seller, dated as of
September 1, 2006, relating to the transfer of all of the CSMC Mortgage Loan
Seller's right, title and interest in and to the mortgage loans identified on
Schedule II thereto.

            "CSMC Mortgage Loan Seller" or "Column": Column Financial, Inc., a
Delaware corporation, and its successors in interest.

            "Cure Event": The exercise by the 828-850 Madison Avenue Junior Loan
Holder, 3434 North Washington Boulevard Junior Loan Holder or CBA B Loan Holder
of the cure rights set forth in the related Intercreditor Agreement, whether for
one month, or for consecutive months in the aggregate.

            "Cure Payments": With respect to any Loan Combination, as to which
the related Intercreditor Agreement provides that a Junior Loan Holder shall be
entitled to cure a default under the related Loan, the payment that such Junior
Loan Holder makes to the applicable Master Servicer or Special Servicer, as
applicable, which payments shall consist (without duplication) of all actual
costs, expenses, losses, obligations, damages, penalties, and disbursements
imposed on or incurred (whether or not yet paid) by the applicable Master
Servicer or Special Servicer (including, without limitation, all unreimbursed
Advances (without regard to whether such Advance would be a Nonrecoverable
Advance) and any interest accrued thereon, Default Interest and any servicing
compensation incurred with respect to the related Loan) during the period of
time from the expiration of the grace period under such Loan until such Cure
Payment is made or such other cure is otherwise effected.

            "Cut-off Date": Individually and collectively, the respective Due
Dates for the Loans in September 2006, (except that in the case of certain of
the underlying mortgage loans that have their first due date in October 2006, as
of the equivalent day of the month in September 2006 had their first due date
been in September 2006).

            "Cut-off Date Principal Balance": With respect to any Loan,
Companion Loan or Junior Loan, the outstanding principal balance of such Loan,
Companion Loan or Junior Loan as of the Cut-off Date, after application of all
payments of principal due on or before such date, whether or not received.

            "Debt Service Coverage Ratio": With respect to any Loan (other than
Co-op Loans) for any twelve-month period covered by an annual operating
statement for the related Mortgaged Property, the ratio of (i) Net Operating
Income produced by the related Mortgaged Property during such period to (ii) the
aggregate amount of Monthly Payments (other than any Balloon Payment) due under
such Loan during such period; and with respect to Co-op Loans, as of any date of
determination, the ratio of (1) the Projected Net Cash Flow for the related
Mortgaged Property on an annualized basis to (2) the annualized amount of debt
service payable on that Co-op Loan.

            "Default Interest": With respect to any Loan, Junior Loan or REO
Loan, any amounts collected thereon, other than late payment charges or
prepayment consideration, that represent interest in excess of interest accrued
on the principal balance of such Loan, Junior Loan or REO Loan at the related
Mortgage Rate, such excess interest arising out of a default thereunder.

             "Defaulted Loan": A Loan, Junior Loan or Companion Loan that is (i)
at least 60 days delinquent in respect of its Monthly Payments, or (ii)
delinquent in respect of its Balloon Payment, if any, in each case, without
giving effect to any grace period permitted by the related Mortgage or Note or
if any non-monetary event of default occurs that results in the Loan, Junior
Loan or Companion Loan becoming a Specially Serviced Loan; provided, however,
that no Monthly Payment (other than a Balloon Payment) shall be deemed
delinquent if less than ten dollars of all amounts due and payable on such Loan,
Companion Loan or related Junior Loan has not been received.

            "Defaulting Party": As defined in Section 7.01(b).

            "Defeasance Collateral": As defined in Section 3.08.

            "Defeasance Loan": As defined in Section 3.08.

            "Defect": As defined in Section 2.02(e).

            "Deficient Valuation": With respect to any Loan (other than any Loan
that constitutes part of a Serviced Loan Combination), the 280 Park Avenue Total
Loan, the 828-850 Madison Avenue Total Loan, the 3434 North Washington Boulevard
Total Loan, the 500 Sansome Office Total Loan or any CBA A/B Loan Pair, a
valuation by a court of competent jurisdiction of the related Mortgaged Property
in an amount less than the then outstanding principal balance of such Loan, 280
Park Avenue Total Loan, 828-850 Madison Avenue Total Loan, 3434 North Washington
Boulevard Total Loan, 500 Sansome Office Total Loan or such CBA A/B Loan Pair,
as the case may be, which valuation results from a proceeding initiated under
the Bankruptcy Code.

            "Definitive Certificate": A Certificate issued in registered,
definitive physical form.

            "Depositor": Credit Suisse First Boston Mortgage Securities Corp., a
Delaware corporation, or its successor in interest.

            "Depository": The Depository Trust Company, or any successor
Depository hereafter named. The nominee of the initial Depository for purposes
of registering those Certificates that are to be Book-Entry Certificates, is
Cede & Co. The Depository shall at all times be a "clearing corporation" as
defined in Section 8-102(3) of the Uniform Commercial Code of the State of New
York and a "clearing agency" registered pursuant to the provisions of Section
17A of the Exchange Act.

            "Depository Participant": A broker, dealer, bank or other financial
institution or other Person for whom from time to time the Depository effects
book-entry transfers and pledges of securities deposited with the Depository.

            "Determination Date": With respect to any Distribution Date, the
close of business on the 11th day of the month in which such Distribution Date
occurs, or if such 11th day is not a Business Day, the Business Day immediately
following such 11th day.

            "Directing Certificateholder": The Controlling Class
Certificateholder, or its designee, selected by the holders or beneficial owners
of more than 50% of the Percentage Interests in the Controlling Class, by
Certificate Principal Balance, as certified by the Trustee from time to time,
and as shall be evidenced by notice delivered by the Directing Certificateholder
to the parties hereto and the prior Directing Certificateholder, if any;
provided, however, that until a Directing Certificateholder is so selected or
after receipt of a notice from the Holders of more than 50% of the Percentage
Interests in the Controlling Class that a Directing Certificateholder is no
longer designated, the Controlling Class Certificateholder that beneficially
owns the largest aggregate Certificate Principal Balance of the Controlling
Class shall be the Directing Certificateholder. The initial Directing
Certificateholder will be Hyperion Brookfield Asset Management Inc. No
appointment of any other Person as a Directing Certificateholder shall be
effective until such Person provides the Trustee, the Master Servicers and the
Special Servicers with written confirmation of its acceptance of such
appointment, an address and telecopy number for the delivery of notices and
other correspondence and a list of officers or employees of such Person with
whom the parties to this Agreement may deal (including their names, titles, work
addresses and telecopy numbers). If no Person is appointed a Directing
Certificateholder, the Master Servicers, the Special Servicers and the Trustee
shall not be required to recognize the Controlling Class Certificateholder that
beneficially owns the largest aggregate Certificate Principal Balance of the
Controlling Class as the Directing Certificateholder until such Controlling
Class Certificateholder provides an address and telecopy number for the delivery
of notices and other correspondence and a list of officers or employees of such
Person with whom the parties to this Agreement may deal (including their names,
titles, work addresses and telecopy numbers). With respect to the 280 Park
Avenue Total Loan and any approval and consent rights in this Agreement with
respect to the 280 Park Avenue Total Loan, the holder of the 280 Park Avenue
Loan shall exercise such rights in accordance with the 280 Park Avenue
Intercreditor Agreement, provided that the Directing Certificateholder may
exercise the portion of such rights allocated to the 280 Park Avenue Loan.

            "Directly Operate": With respect to any REO Property, the furnishing
or rendering of services to the tenants thereof that are not (within the meaning
of Treasury Regulations Section 1.512(b)-1(c)(5)) customarily provided to
tenants in connection with the rental of space for occupancy, the management or
operation of such REO Property, the holding of such REO Property primarily for
sale to customers in the ordinary course of a trade or business, the performance
of any construction work thereon or any use of such REO Property in a trade or
business conducted by the Trust Fund, in each case other than through an
Independent Contractor; provided, however, that the Trustee (or the applicable
Master Servicer or Special Servicer on behalf of the Trustee) shall not be
considered to Directly Operate an REO Property solely because the Trustee (or
the applicable Master Servicer or Special Servicer on behalf of the Trustee)
establishes rental terms, chooses tenants, enters into or renews leases, deals
with taxes and insurance or makes decisions as to repairs (of the type that
would be deductible under Section 162 of the Code) or capital expenditures with
respect to such REO Property.

            "Disclosure Documents": Collectively, the Time of Sale Information
and the Prospectus.

            "Disqualified Organization": Any of (i) the United States, any State
or political subdivision thereof, any possession of the United States or any
agency or instrumentality of any of the foregoing (other than an instrumentality
that is a corporation if all of its activities are subject to tax and, except
for FHLMC, a majority of its board of directors is not selected by such
governmental unit), (ii) a foreign government, any international organization or
any agency or instrumentality of any of the foregoing, (iii) any organization
(other than certain farmers' cooperatives described in Section 521 of the Code)
that is exempt from the tax imposed by Chapter 1 of the Code (including the tax
imposed by Section 511 of the Code on unrelated business taxable income), (iv)
rural electric and telephone cooperatives described in Section 1381(a)(2)(C) of
the Code and (v) any other Person so designated by the Master Servicer or the
Certificate Administrator based upon an Opinion of Counsel provided to the
Certificate Administrator (which shall not be an expense of the Certificate
Administrator) that the holding of an Ownership Interest in a Class R
Certificate by such Person may cause the 828-850 Madison Avenue Loan REMIC, the
Lower-Tier REMIC or the Upper-Tier REMIC to fail to qualify as a REMIC or any
Person having an Ownership Interest in any Class of Certificates (other than
such Person) to incur a liability for any federal tax imposed under the Code
that would not otherwise be imposed but for the Transfer of an Ownership
Interest in a Class R Certificate to such Person. The terms "United States,"
"State" and "international organization" shall have the meanings set forth in
Section 7701 of the Code or successor provisions.

             "Distribution Account": The account, accounts or, subject to Section
3.04(i), sub-accounts (including sub-accounts for the Lower-Tier REMIC and the
Upper-Tier REMIC) created and maintained by the Certificate Administrator,
pursuant to Section 3.04(b), in trust for the Certificateholders, which, subject
to Section 3.04(i), shall be entitled "LaSalle Bank National Association, as
Certificate Administrator, for the benefit of Holders of Credit Suisse First
Boston Mortgage Securities Corp., Commercial Mortgage Pass-Through Certificates,
Series 2006-C4, Distribution Account." Any such account or sub-account shall be
an Eligible Account or, subject to Section 3.04(i), a sub-account of an Eligible
Account.

            "Distribution Date": With respect to any month, the fourth Business
Day after the Determination Date of such month, commencing in October 2006.

            "Do Not Hire List": The list, as may be updated at any time,
provided by the Depositor to the Master Servicers, Special Servicers,
Certificate Administrator and Trustee, which lists certain parties identified by
the Depositor as having materially failed to comply with their respective
obligations under Article XI of this Agreement or as having materially failed to
comply with any similar Regulation AB reporting requirements under any pooling
and servicing agreement relating to any other series of certificates offered by
the Depositor.

            "Due Date": With respect to (i) any Loan, Companion Loan or Junior
Loan, on or prior to its Maturity Date, the day of the month set forth in the
related Note on which each Monthly Payment thereon is scheduled to be first due
(without giving effect to any grace period with respect to late Monthly
Payments), (ii) any Loan, Companion Loan or Junior Loan, after the Maturity Date
therefor, the day of the month set forth in the related Note on which each
Monthly Payment on such Loan, Companion Loan or Junior Loan had been scheduled
to be first due (without giving effect to any grace period) and (iii) any REO
Loan, the day of the month set forth in the related Note on which each Monthly
Payment on the related Loan, Companion Loan or Junior Loan, as applicable, had
been scheduled to be first due (without giving effect to any grace period).

            "Due Period": With respect to each Distribution Date, the period
commencing immediately following the Determination Date in the calendar month
preceding the month in which such Distribution Date occurs and ending on and
including the Determination Date in the calendar month in which such
Distribution Date occurs.

            "EDGAR" The Electronic Data Gathering, Analysis, and Retrieval
System of the Commission, which is the computer system for the receipt,
acceptance, review and dissemination of documents submitted to the Commission in
electronic format.

            "Eligible Account": Either (i) an account or accounts maintained
with a federal or state chartered depository institution or trust company
(including the Trustee or the Certificate Administrator) the long-term unsecured
debt obligations of which are rated at least "AA" by S&P and Fitch (or, in
either case, "A" if the short-term debt obligations thereof have a short-term
rating of not less than "A-1" by S&P or "F1" by Fitch, as applicable), if the
deposits are to be held in such account for more than 30 days, or the short-term
debt obligations of which have a short-term rating of not less than "A-1" by S&P
and "F1" by Fitch, if the deposits are to be held in such account for 30 days or
less, or such other account or accounts with respect to which each of the Rating
Agencies shall have confirmed in writing that the then-current rating assigned
to any of the Certificates that are currently being rated by such Rating Agency
will not be qualified (as applicable), downgraded or withdrawn by reason thereof
or (ii) a segregated trust account or accounts maintained with the corporate
trust department of a federal- or state-chartered depository institution or
trust company that, in either case, has a combined capital and surplus of at
least $50,000,000 and has corporate trust powers, acting in its fiduciary
capacity, provided that any state-chartered depository institution or trust
company is subject to regulation regarding fiduciary funds substantially similar
to 12 C.F.R. ss. 9.10(b), (iii) in the case of Reserve Accounts and Servicing
Accounts with respect to NCB Loans, any account maintained with NCB, FSB
(provided that NCB, FSB has a combined capital and surplus of at least
$40,000,000), (iv) an account or accounts maintained with KeyBank so long as
KeyBank shall have a long-term unsecured debt rating of at least "A" from each
of S&P and Fitch and a short-term rating of at least "A-1" from S&P and "F1"
from Fitch, or (v) such other account or accounts with respect to which each of
the Rating Agencies shall have confirmed in writing that the then-current rating
assigned to any of the Certificates or any Companion Loan Securities that are
currently being rated by such Rating Agency will not be qualified (as
applicable), downgraded or withdrawn by reason thereof. Eligible Accounts may
bear interest. No Eligible Account shall be evidenced by a certificate of
deposit, passbook or other similar instrument.

            "Environmental Assessment": A "Phase I environmental assessment" as
described in and meeting the criteria of the American Society of Testing
Materials Standard E 1527-94 or any successor thereto published by the American
Society of Testing Materials.

            "Environmental Insurance Policy": With respect to any Loan, any
insurance policy covering Insured Environmental Events that is maintained from
time to time in respect of such Loan or the related Mortgaged Property.

            "Environmental Insurer": The provider of insurance pursuant to any
Environmental Insurance Policy.

            "ERISA": The Employee Retirement Income Security Act of 1974, as
amended.

            "Escrow Payment": Any payment received by a Master Servicer for the
account of any Borrower for application toward the payment of real estate taxes,
assessments, Insurance Policy premiums and similar items in respect of the
related Mortgaged Property, including amounts for deposit to any reserve
account.

            "Euroclear": The Euroclear System.

            "Event of Default": One or more of the events described in Section
7.01(a).

            "Excess Interest": With respect to each of the ARD Loans or any
successor REO Loan with respect thereto, interest accrued on such ARD Loan or
REO Loan, as the case may be, and allocable to the Excess Rate. The Excess
Interest is an asset of the Trust Fund, but shall not be an asset of any Trust
REMIC.

            "Excess Liquidation Proceeds": The excess, if any, of (a) the
Liquidation Proceeds from the sale or liquidation of a Specially Serviced Loan
or REO Property, net of (i) interest on any related Advances and (ii) any
related Servicing Advances, over (b) the amount needed to pay off in full such
Loan (or if such amount relates to a Loan Combination, the amount needed to pay
off such Loan Combination) or the related REO Loan(s) and all amounts due with
respect thereto.

            "Excess Liquidation Proceeds Account": The trust account, accounts
or, subject to Section 3.04(i), sub-account created and maintained by the
Certificate Administrator, pursuant to Section 3.04(d), in trust for the
Certificateholders, which, subject to Section 3.04(i), shall be entitled
"LaSalle Bank National Association, as Certificate Administrator in trust for
the registered holders of Credit Suisse First Boston Mortgage Securities Corp.,
Commercial Mortgage Pass-Through Certificates, Series 2006-C4." The Excess
Liquidation Proceeds Account shall be an asset of the Lower-Tier REMIC (other
than with respect to the 828-850 Madison Avenue Loan REMIC), and with respect to
the 828-850 Madison Avenue Loan REMIC shall be an "outside reserve fund"
beneficially owned by the Holders of the Class R Certificates, who shall be
treated as the beneficial owners thereof for federal income tax purposes and
taxable on all reinvestment income thereon, and (notwithstanding that such funds
are to be held for the benefit of the Holders of the Regular Certificates until
the termination of the Trust Fund pursuant to Section 9.01 hereof) to whom any
distribution of Excess Liquidation Proceeds from the 828-850 Madison Avenue Loan
REMIC shall be deemed to be made. Any such account or, subject to Section
3.04(i), sub-account shall be an Eligible Account.

            "Excess Rate": With respect to each ARD Loan (and each REO Loan that
relates to an ARD Loan) after the related Anticipated Repayment Date, the excess
of (i) the applicable Revised Rate over (ii) the applicable Mortgage Rate, each
as initially set forth in the Mortgage Loan Schedule.

            "Excess Servicing Strip": Solely with respect to the Loans serviced
by Master Servicer No. 1 and Master Servicer No. 2, with respect to any Loan or
any successor REO Loan with respect thereto, the portion of the related Master
Servicing Fee calculated at an annual rate equal to the excess, if any, of the
related Master Servicing Fee Rate over 0.005% (0.5 basis points) per annum,
subject to reduction by the Trustee pursuant to Section 3.11(a).

            "Exchange Act": The Securities Exchange Act of 1934, as amended from
time to time.

            "Exchange Act Report": The monthly Statement to Certificateholders
to be filed with the Commission, under cover of the related form required by the
Exchange Act.

            "Exemption Favored Party": Any of (i) Credit Suisse Securities (USA)
LLC, (ii) any Person directly or indirectly, through one or more intermediaries,
controlling, controlled by or under common control with Credit Suisse Securities
(USA) LLC, and (iii) any member of any underwriting syndicate or selling group
of which any Person described in clauses (i) and (ii) is a manager or co-manager
with respect to a Class of Certificates (other than the Class R and Class V
Certificates) that is investment grade rated by at least one Rating Agency.

            "Fair Value": As defined in Section 3.18(b).

            "FDIC": Federal Deposit Insurance Corporation or any successor.

            "FHLMC": Federal Home Loan Mortgage Corporation or any successor.

            "Final Distribution Date": The final Distribution Date on which any
distributions are to be made hereunder on the Certificates in connection with
the termination of the Trust.

            "Final Recovery Determination": A determination by the applicable
Special Servicer with respect to any defaulted Loan, Junior Loan or any REO
Property that there has been a recovery of all Insurance and Condemnation
Proceeds, Liquidation Proceeds and other payments or recoveries that, in the
Special Servicer's reasonable good faith judgment, exercised without regard to
any obligation of the Special Servicer to make payments from its own funds
pursuant to Section 3.07(b), will ultimately be recoverable.

            "Fitch": Fitch, Inc. or its successor in interest. If neither such
rating agency nor any successor remains in existence, "Fitch" shall be deemed to
refer to such other nationally recognized statistical rating agency or other
comparable Person designated by the Depositor, notice of which designation shall
be given to the other parties hereto, and specific ratings of Fitch, Inc. herein
referenced shall be deemed to refer to the equivalent ratings of the party so
designated. References herein to "applicable rating category" (other than such
references to "highest applicable rating category") shall, in the case of Fitch,
be deemed to refer to such applicable rating category of Fitch, without regard
to any plus or minus or other comparable rating qualification.

            "Floating Rate Account": The account, accounts or, subject to
Section 3.04(j), sub-accounts created and maintained by the Certificate
Administrator, pursuant to Section 3.04(c), in trust for the Class A-4FL
Certificateholders, which, subject to Section 3.04(j), shall be entitled
"LaSalle Bank National Association, as Certificate Administrator, for the
benefit of Holders of Credit Suisse First Boston Mortgage Securities Corp.,
Commercial Mortgage Pass-Through Certificates, Series 2006-C4, Class A-4FL,
Floating Rate Account." Any such account or sub-account shall be an Eligible
Account or, subject to Section 3.04(j), a sub-account of an Eligible Account.

            "FNMA": Federal National Mortgage Association or any successor
thereto.

            "Form 8-K Disclosure Information": As defined in Section 11.09.

            "GAAP": Generally Accepted Accounting Principles in the United
States.

            "Global Certificate": With respect to any Class of Non-Registered
Certificates, any related Regulation S Global Certificate or Rule 144A Global
Certificate.

            "Grantor Trust": The portion of the Trust Fund consisting of (i) the
Broker Strip Interest and any amounts on deposit in the Collection Account
representing the Broker Strip Interest, (ii) the Excess Interest and the 828-850
Madison Avenue Loan REMIC Residual Interest and the respective proceeds thereof
in the Grantor Trust Distribution Account, and (iii) the Class A-4FL Regular
Interest, the Swap Contract and the Floating Rate Account, intended to be
treated as a grantor trust as defined under subpart E of Part 1 of subchapter J
of the Code.

             "Grantor Trust Distribution Account": The trust account, accounts
or, subject to Section 3.04(i), sub-account created and maintained by the
Certificate Administrator, pursuant to Section 3.04(c), in trust for the
Certificateholders, which, subject to Section 3.04(i), shall be entitled
"LaSalle Bank National Association, as Certificate Administrator in trust for
Holders of Credit Suisse First Boston Mortgage Securities Corp., Commercial
Mortgage Pass-Through Certificates, Series 2006-C4, Grantor Trust Distribution
Account" and which shall be an Eligible Account or, subject to Section 3.04(i),
a sub-account of an Eligible Account. The Grantor Trust Distribution Account
shall not be an asset of any Trust REMIC.

            "Group A Loan": Any Loan identified on the Mortgage Loan Schedule as
belonging to Servicing Group A, together with any other Loan that is substituted
in replacement thereof pursuant to or as contemplated by the related Mortgage
Loan Purchase Agreement.

            "Group B Loan": Any Loan identified on the Mortgage Loan Schedule as
belonging to Servicing Group B, together with any other Loan that is substituted
in replacement thereof pursuant to or as contemplated by the related Mortgage
Loan Purchase Agreement.

            "Hazardous Materials": Any dangerous, toxic or hazardous pollutants,
chemicals, wastes or substances, including, without limitation, those so
identified pursuant to CERCLA or any other federal, state or local environmental
related laws and regulations, and specifically including, without limitation,
asbestos and asbestos-containing materials, polychlorinated biphenyls, radon
gas, petroleum and petroleum products, urea formaldehyde and any substances
classified as being "in inventory," "usable work in process" or similar
classification which would, if classified as unusable, be included in the
foregoing definition.

            "Independent": When used with respect to any specified Person, any
such Person that (i) is in fact independent of the Depositor, each Junior Loan
Holder, each Master Servicer, each Special Servicer, the Trustee, the
Certificate Administrator and any and all Affiliates thereof, (ii) does not have
any material direct financial interest in or any material indirect financial
interest in any of the Depositor, any Junior Loan Holder, any Master Servicer,
any Special Servicer or any Affiliate thereof, and (iii) is not connected with
the Depositor, any Junior Loan Holder, any Master Servicer, any Special Servicer
or any Affiliate thereof as an officer, employee, promoter, underwriter,
trustee, partner, director or Person performing similar functions; provided,
however, that a Person shall not fail to be Independent of the Depositor, any
Junior Loan Holder, any Master Servicer, any Special Servicer, the Trustee, the
Certificate Administrator or any Affiliate thereof merely because such Person is
the beneficial owner of 1% or less of any class of debt or equity securities
issued by the Depositor, such Junior Loan Holder, such Master Servicer, such
Special Servicer, the Trustee, the Certificate Administrator or any Affiliate
thereof, as the case may be, provided that such ownership constitutes less than
1.0% of the total assets of such Person.

            "Independent Contractor": Either (i) any Person that would be an
"independent contractor" with respect to the Trust Fund within the meaning of
Section 856(d)(3) of the Code if the Trust Fund were a real estate investment
trust (except that the ownership test set forth in that Section shall be
considered to be met by any Person that owns, directly or indirectly, 35% or
more of any Class of Certificates, or such other interest in any Class of
Certificates as is set forth in an Opinion of Counsel, which shall be at no
expense to the Trustee, the Certificate Administrator, the Master Servicer or
the Trust, delivered to the Trustee, the Certificate Administrator and the
applicable Master Servicer), so long as the Trust Fund does not receive or
derive any income from such Person and provided that the relationship between
such Person and the Trust Fund is at arm's length, all within the meaning of
Treasury Regulations Section 1.856-4(b)(5) (except that no Master Servicer or
Special Servicer shall be considered to be an Independent Contractor under the
definition in this clause (i) unless an Opinion of Counsel (at the expense of
the party seeking to be deemed an Independent Contractor) has been delivered to
the Trustee to that effect or (ii) any other Person (including the Master
Servicers and the Special Servicers) upon receipt by the Trustee, the
Certificate Administrator and the applicable Master Servicer of an Opinion of
Counsel (at the expense of the party seeking to be deemed an Independent
Contractor), to the effect that the taking of any action in respect of any REO
Property by such Person, subject to any conditions therein specified, that is
otherwise herein contemplated to be taken by an Independent Contractor will not
cause such REO Property to cease to qualify as "foreclosure property" within the
meaning of Section 860G(a)(8) of the Code or cause any income realized in
respect of such REO Property to fail to qualify as Rents from Real Property
(provided that such income would otherwise so qualify).

            "Independent Director": A duly appointed member of the board of
directors of the relevant entity who shall not have been, at the time of such
appointment, at any time after appointment, or at any time in the preceding five
years, (i) a direct or indirect legal or beneficial owner in such entity or any
of its affiliates, (ii) a creditor, supplier, employee, officer, director,
manager or contractor of such entity or any of its affiliates, (iii) a person
who controls such entity or any of its affiliates, or (iv) a member of the
immediate family of a person defined in (i), (ii) or (iii) above.

            "Initial LTV Co-op Basis": With respect to any Co-op Loan, the
related loan-to-value ratio specified on the Mortgage Loan Schedule.

            "Initial Purchaser": Credit Suisse Securities (USA) LLC, as initial
purchaser of the Non-Registered Certificates.

            "Initial Resolution Period": As defined in Section 2.03(b).

            "Institutional Accredited Investor" or "IAI": An "accredited
investor" as defined in any of paragraphs (1), (2), (3) and (7) of Rule 501(a)
under the Securities Act or any entity in which all of the equity owners come
within such paragraphs.

            "Institutional Lender/Owner": One or more of the following: (i) a
bank, saving and loan association, investment bank, insurance company, real
estate investment trust, trust company, commercial credit corporation, pension
plan, pension fund or pension advisory firm, mutual fund, government entity or
plan, (ii) an investment company, money management firm or "qualified
institutional buyer" within the meaning of Rule 144A under the Securities Act,
which is regularly engaged in the business of making or owning mezzanine loans
of similar types to the mezzanine loan in the question, (iii) a trustee in
connection with a securitization of the mezzanine loan, so long as such trustee
or the servicer therefor is an entity that otherwise would be an Institutional
Lender/Owner, (iv) an institution substantially similar to any of the foregoing,
in each case of clauses (i), (ii), (iii) or (iv) of this definition, which (A)
has total assets (in name or under management) in excess of $600,000,000 and
(except with respect to a pension advisory firm or similar fiduciary)
capital/statutory surplus or shareholder's equity of $200,000,000 and (B) is
regularly engaged in the business of making or owning commercial loans or (v) an
entity Controlled (as defined below) by the Underwriters or any of the entities
described in clause (i) above. For purposes of this definition only, "Control"
means the ownership, directly or indirectly, in the aggregate of more than fifty
percent (50%) of the beneficial ownership interests of an entity and the
possession, directly or indirectly, of the power to direct or cause the
direction of the management or policies of an entity, whether through the
ability to exercise voting power, by contract or otherwise ("Controlled" has the
meaning correlative thereto). The applicable Special Servicer shall obtain from
the proposed transferee, and shall be entitled to rely on, (i) an officer's
certificate of a proposed transferee that such transferee satisfies the
requirements of this definition and (ii) in the case of any proposed transferee
that is an entity described in and meeting the criteria in clauses (i)-(iv) of
the immediately preceding sentence, the most recent financial statements of such
transferee.

            "Insurance and Condemnation Proceeds": All proceeds (net of expenses
of collection) paid under any Insurance Policy or in connection with the full or
partial condemnation of a Mortgaged Property, in either case, to the extent such
proceeds are not applied to the restoration of the related Mortgaged Property or
released to the Borrower, in either case, in accordance with the Servicing
Standard.

            "Insurance Policy": With respect to any Loan, Junior Loan or REO
Property, any hazard insurance policy, flood insurance policy, title insurance
policy, earthquake insurance policy, environmental insurance policy, business
interruption insurance policy or other insurance policy that is maintained from
time to time in respect of such Loan, Junior Loan (or the related Mortgaged
Property) or such REO Property, as the case may be.

            "Insured Environmental Event": As defined in Section 3.07.

            "Intercreditor Agreement": The 828-850 Madison Avenue Intercreditor
Agreement, the 280 Park Avenue Intercreditor Agreement, the 3434 North
Washington Boulevard Intercreditor Agreement, the 500 Sansome Office
Intercreditor Agreement or any CBA Intercreditor Agreement, individually or
collectively, as the case may be.

            "Interest Accrual Period": With respect to any Class of Regular
Certificates (other than the Class A-4FL Certificates), the Class A-4FL Regular
Interest, any Uncertificated Lower-Tier Interest or the 828-850 Madison Avenue
Loan REMIC Regular Interest and any Distribution Date, the calendar month
preceding the month in which such Distribution Date occurs. With respect to the
Class A-4FL Certificates for any Distribution Date will be the period from and
including the Distribution Date in the month preceding the month in which the
related Distribution Date occurs (or, in the case of the first Distribution
Date, from and including the Closing Date) to, but excluding, the related
Distribution Date; except that, if the Swap Agreement is terminated and not
replaced or if there exists a continuing payment default by the Swap
Counterparty under the Swap Agreement, then the Interest Accrual Period with
respect to the Class A-4FL Certificates for any Distribution Date will be the
same as the Interest Accrual Period for the Class A-4FL Regular Interest. Each
Interest Accrual Period with respect to any Class of Regular Certificates (other
than the Class A-4FL Certificates), the Class A-4FL Regular Interest or any
Uncertificated Lower-Tier Interest shall be deemed for purposes of this
definition to consist of 30 days. Each Interest Accrual Period with respect to
the Class A-4FL Certificates shall be based upon the actual number of days in
the related Interest Accrual Period; except that, if the Swap Agreement is
terminated and not replaced or if there exists a continuing payment default by
the Swap Counterparty under the Swap Agreement, then any Interest Accrual Period
with respect to the Class A-4FL Certificates will also be deemed to consist of
30 days.

            "Interest-Only Certificates": Collectively, the Class A-X, Class
A-SP and Class A-Y Certificates.

            "Interest Reserve Account": The account, accounts or, subject to
Section 3.04(i), sub-accounts created and maintained by the Certificate
Administrator, pursuant to Section 3.28, in trust for the Certificateholders,
which, subject to Section 3.04(i), shall be entitled "LaSalle Bank National
Association, as Certificate Administrator in trust for the registered holders of
Credit Suisse First Boston Mortgage Securities Corp., Commercial Mortgage
Pass-Through Certificates, Series 2006-C4, Interest Reserve Account," and which
shall be an Eligible Account or, subject to Section 3.04(i), a sub-account of an
Eligible Account.

            "Interest Reserve Loan": Any Loan that accrues interest on an
Actual/360 Basis (or any successor REO Loan with respect thereto), and in the
case of the 828-850 Madison Avenue Loan, the 828-850 Madison Avenue Loan REMIC
Regular Interest.

            "Interest Shortfall Amount": As to any Distribution Date and any
Class of Regular Certificates or the Class A-4FL Regular Interest, the amount,
if any, by which the amount distributed on such Class on such Distribution Date
in respect of interest is less than the related Optimal Interest Distribution
Amount.

            "Interested Person": The Depositor, any Master Servicer, any Special
Servicer, any Independent Contractor engaged by a Special Servicer, any Holder
of a Certificate or any Affiliate of any such Person.

            "Investment Account": As defined in Section 3.06(a).

            "Issue Price": With respect to each Class of Certificates, the
"issue price" as defined in the REMIC Provisions.

            "Junior Loans": The 828-850 Madison Avenue Junior Loan, 3434 North
Washington Boulevard Junior Loan, the 500 Sansome Office Junior Loan and the CBA
B Loans, collectively or individually, as the case may be, each of which are
subordinate in right of payment to the related A Loan.

            "Junior Loan Custodial Account": Each of the custodial accounts or,
subject to Section 3.04(h), sub-accounts (none of which are included in the
Trust Fund) created and maintained by the applicable Master Servicer pursuant to
Section 3.04 on behalf of the respective Junior Loan Holders. Each Junior Loan
Custodial Account shall be maintained as an Eligible Account or, subject to
Section 3.04(h), a sub-account of an Eligible Account.

            "Junior Loan Holder": Any holder of a Junior Loan or any successor
REO Loan with respect thereto.

            "KeyBank": KeyBank National Association, a national banking
association, and its successors in interest.

            "KeyBank Loans": The mortgage loans transferred to the Depositor
pursuant to the KeyBank Mortgage Loan Purchase Agreement and identified on
Schedule II thereto, together with any mortgage loans substituted in replacement
thereof pursuant to the KeyBank Mortgage Loan Purchase Agreement.

            "KeyBank Mortgage Loan Purchase Agreement": The agreement between
the Depositor as purchaser and the KeyBank Mortgage Loan Seller as seller, dated
as of September 1, 2006, relating to the transfer of all of the KeyBank Mortgage
Loan Seller's right, title and interest in and to the mortgage loans identified
on Schedule II thereto.

            "KeyBank Mortgage Loan Seller": KeyBank National Association, a
national banking association, and its successors in interest.

            "KRECM": KeyCorp Real Estate Capital Markets, Inc., an Ohio
corporation, and its successors in interest.

            "LaSalle": LaSalle Bank National Association, a national banking
association, and its successors in interest.

            "LaSalle Mortgage Loan Purchase Agreement": The agreement between
the Depositor as purchaser and the LaSalle Mortgage Loan Seller as seller, dated
as of September 1, 2006, relating to the transfer of all of the LaSalle Mortgage
Loan Seller's right, title and interest in and to the mortgage loans identified
on Schedule II thereto.

            "LaSalle Mortgage Loan Seller": LaSalle Bank National Association, a
national banking association, and its successors in interest.

            "Late Collections": With respect to any Loan, Companion Loan or
Junior Loan, all amounts (except Penalty Charges) received thereon during any
Due Period, whether as payments, Insurance and Condemnation Proceeds,
Liquidation Proceeds or otherwise, which represent late payments or collections
of principal or interest due in respect of such Loan, Companion Loan or Junior
Loan (without regard to any acceleration of amounts due thereunder by reason of
default) on a Due Date in a previous Due Period and not previously received.
With respect to any REO Loan, all amounts (except Penalty Charges) received in
connection with the related REO Property during any Due Period, whether as
Insurance and Condemnation Proceeds, Liquidation Proceeds, REO Revenues or
otherwise, which represent late collections of principal or interest due or
deemed due in respect of such REO Loan or the predecessor Loan (or predecessor
Companion Loan or Junior Loan, as the case may be) (without regard to any
acceleration of amounts due under the predecessor Loan (or predecessor Companion
Loan or Junior Loan, as the case may be) by reason of default) on a Due Date in
a previous Due Period and not previously received.

            "LIBOR": With respect to the Class A-4FL Certificates, the meaning
given such term in the Swap Agreement.

            "Liquidation Event": With respect to any Loan or REO Property, any
of the following events: (i) payment in full of such Loan; (ii) the making of a
Final Recovery Determination with respect to such Loan or REO Property; (iii)
the repurchase or replacement of such Loan (or portion thereof with respect to
the Ritz Carlton Mortgage Loan) by or on behalf of the related Responsible Party
pursuant to Section 7 of the related Mortgage Loan Purchase Agreement or, in the
case of a CSMC Loan, pursuant to the Column Performance Guarantee; (iv) the
purchase of such Loan or REO Property by the Directing Certificateholder or the
Special Servicer or any assignee or Affiliate of either of the foregoing
pursuant to Section 3.18; (v) in the case of any Loan Combination for which the
related Intercreditor Agreement so provides, the purchase of the related A Loan
by a related Junior Loan Holder or Companion Loan Holder; (vi) the purchase of
such Loan by a related mezzanine lender pursuant to the terms of any related
intercreditor agreement; (vii) the sale or other liquidation of such REO
Property hereunder; or (viii) the purchase of such Loan or REO Property) by the
Holders of more than 50% of the Percentage Interests in the Controlling Class, a
Special Servicer or a Master Servicer pursuant to Section 9.01.

            "Liquidation Fee": A fee payable to the applicable Special Servicer
with respect to each Specially Serviced Loan or REO Loan as to which the
applicable Special Servicer receives a full or discounted payoff with respect
thereto from the related Borrower or any Liquidation Proceeds with respect
thereto, equal to the product of the Liquidation Fee Rate and the proceeds of
such full or discounted payoff or the net Liquidation Proceeds (net of the
related costs and expenses associated with the related liquidation) related to
such liquidated Specially Serviced Loan or REO Loan, as the case may be;
provided, however, that no Liquidation Fee shall be payable with respect to
clauses (iii) (so long as the subject repurchase occurs within the applicable
cure period set forth in the related Mortgage Loan Purchase Agreement, as
extended), (iv), (v) (with respect to purchases of the Defaulted Loan by the
related Junior Loan Holder or Companion Loan Holder, so long as such repurchase
occurs within 60 days (or 90 days in the case of the 828-850 Madison Avenue
Loan) from the date the related Loan becomes a Specially Serviced Loan, and in
any case, no such fee is payable with respect to a purchase of the 3434 North
Washington Boulevard Loan), (vi) (so long as the subject purchase occurs within
the time period required under the related intercreditor agreement, or if no
such time period is set forth therein, within 60 days after such mezzanine
lender receives notice of the default giving rise to the purchase option) or,
(vii) of the definition of "Liquidation Proceeds".

            "Liquidation Fee Rate": As defined in Section 3.11.

            "Liquidation Proceeds": Cash amounts (other than REO Revenues)
actually received by or on behalf of the Trust, net of expenses, in connection
with: (i) the liquidation of a Mortgaged Property or other collateral
constituting security for a defaulted Loan or Loan Combination (including in the
case of any Loan Combination, the default of the related Loan, Companion Loan or
Junior Loan, as applicable, collectively), through trustee's sale, foreclosure
sale, REO Disposition or otherwise, exclusive of any portion thereof required to
be released to the related Borrower; (ii) the realization upon any deficiency
judgment obtained against a Borrower; (iii) the purchase of a Defaulted Loan by
the Directing Certificateholder or the applicable Special Servicer or any
assignee or Affiliate of either of the foregoing pursuant to Section 3.18; (iv)
the repurchase or replacement of a Loan by or on behalf of the related
Responsible Party pursuant to Section 7 of the related Mortgage Loan Purchase
Agreement or, in the case of a CSMC Loan, pursuant to the Column Performance
Guarantee; (v) in the case of any Loan Combination for which the related
Intercreditor Agreement so provides, the purchase of the related A Loan by any
related Junior Loan Holder or Companion Loan Holder; (vi) the purchase of any
Loan or Loan Combination by a related mezzanine lender; or (vii) the purchase of
all Loans by Holders of more than 50% of the Percentage Interests in the
Controlling Class, a Special Servicer or a Master Servicer pursuant to Section
9.01.

            "Loan": Each of the mortgage loans transferred and assigned to the
Trustee pursuant to Section 2.01, and from time to time held in the Trust Fund
(including, for the avoidance of doubt, the Defeasance Loans and the Additional
Collateral Loans), and any Loan that becomes a Specially Serviced Loan, but
which does not include any Junior Loan or any Companion Loan. As used herein,
the term "Loan" includes the related Note, Mortgage and other documents
contained in the related Mortgage File and any related agreements.

            "Loan Agreement": With respect to any Loan or Junior Loan, the loan
agreement, if any, between the related Mortgage Loan Originator and the
Borrower, pursuant to which such Loan or Junior Loan was made.

            "Loan Combination": With respect to any A Loan, such A Loan and the
related Junior Loan(s) and/or Companion Loan, collectively.

            "Loan Document(s)": With respect to each Loan, Companion Loan or
Junior Loan, to the extent applicable, the Loan Agreement, the Mortgage, the
Note, the Assignment of Leases (if separate from the Mortgage), the Security
Agreement, any cash management agreement, any ground lease, any letters of
credit, escrow or reserve account information relating to the Additional
Collateral Loans, any UCC Financing Statements, the title insurance policy, all
surveys, all insurance policies, any environmental liability agreements, any
escrow agreements for improvements or lease-up, any guaranties related to such
Loan, Companion Loan or Junior Loan, any prior assignments of mortgage in the
event that the originator is not the originator of record, any Management
Agreement, any collateral assignments of property management agreements and
other services agreements required by the applicable commitment and other loan
documents, any preferred equity and mezzanine loan documents and all
modification, consolidation and extension agreements, if any.

            "Loan Group": Either of Loan Group No. 1 or Loan Group No. 2.

            "Loan Group No. 1": Collectively, all of the Loans that are
identified on the Mortgage Loan Schedule as belonging to Loan Group No. 1 and
any successor REO Loans with respect thereto.

            "Loan Group No. 2": Collectively, all of the Loans that are
identified on the Mortgage Loan Schedule as belonging to Loan Group No. 2 and
any successor REO Loans with respect thereto.

             "Loan-to-Value Ratio": With respect to any Loan, as of any date of
determination, the fraction, expressed as a percentage, the numerator of which
is the principal balance of such Loan at the time of determination, and the
denominator of which is the Appraised Value of the related Mortgaged Property.

            "Lock-Box Account": With respect to any Mortgaged Property, the
account, if any, created pursuant to any documents relating to a Loan to receive
revenues therefrom. Any Lock-Box Account shall be beneficially owned for federal
income tax purposes by the Person who is entitled to receive the reinvestment
income or gain thereon in accordance with the terms and provisions of the
related Loan and Section 3.06, which Person (and not the Trust) may be taxed on
all reinvestment income or gain thereon. The applicable Master Servicer shall be
permitted to make withdrawals therefrom for deposit into the related Cash
Collateral Accounts.

            "Lock-Box Agreement": With respect to any Loan, the lock-box
agreement, if any, between the applicable Mortgage Loan Originator or the
applicable Mortgage Loan Seller and the related Borrower, pursuant to which the
related Lock-Box Account may have been established.

            "Lower-Tier Notional Balance": With respect to the Class LA-Y
Lower-Tier Interest, as of any date of determination, a notional amount equal to
the then Class A-Y Notional Amount.

            "Lower-Tier Principal Amount": With respect to any Uncertificated
Lower-Tier Interest (other than the Class LA-Y Lower-Tier Interest), as of any
date of determination, a principal amount equal to the Original Lower-Tier
Principal Amount of such Uncertificated Lower-Tier Interest as specified in the
Preliminary Statement hereto, as such principal amount may be permanently
reduced (to not less than zero) on each Distribution Date coinciding with or
preceding such date of determination by (i) any deemed distributions of
principal with respect to such Uncertificated Lower-Tier Interest on the subject
Distribution Date pursuant to Section 4.01 and (ii) any Collateral Support
Deficit allocated to such Uncertificated Lower-Tier Interest on the subject
Distribution Date pursuant to Section 4.04.

            "Lower-Tier REMIC": One of three separate REMICs comprising the
Trust Fund, the assets of which consist of the Loans (other than the 828-850
Madison Avenue Loan and exclusive of any Broker Strip Interest and any Excess
Interest thereon), the 828-850 Madison Avenue Loan REMIC Regular Interest, any
REO Property with respect thereto (exclusive of any interest therein that a
Junior Loan Holder or Companion Loan Holder may have), such amounts (exclusive
of any Broker Strip Interest and any Excess Interest) as shall from time to time
be held in a Collection Account (other than with respect to the 828-850 Madison
Avenue Loan), the Interest Reserve Account (other than with respect to the
828-850 Madison Avenue Loan), the Closing Date Deposit Amount, any REO Account
(exclusive of any such amounts that are allocable to a Junior Loan, Companion
Loan or the 828-850 Madison Avenue Loan), if any, and related amounts held in
the Distribution Account, and except as otherwise provided in this Agreement,
all other property included in the Trust Fund that is not in the Upper-Tier
REMIC, the 828-850 Madison Avenue Loan REMIC or designated as a grantor trust
asset in the Preliminary Statement hereto.

            "Lower-Tier Remittance Rate": With respect to any Uncertificated
Lower-Tier Interest, for any Distribution Date, either: (a) in the case of the
Class LA-Y Lower-Tier Interest, a per annum rate equal to the Class A-Y
Pass-Through Rate for such Distribution Date and (b) in the case of any other
Uncertificated Lower-Tier Interest, the Weighted Average Net Mortgage
Pass-Through Rate for such Distribution Date.

            "MAI": Member of the Appraisal Institute.

            "Management Agreement": With respect to any Loan, the management
agreement, if any, by and between the Manager and the related Borrower, or any
successor property management agreement between such parties.

            "Manager": With respect to any Loan, any property manager for the
related Mortgaged Property or Mortgaged Properties.

            "Master Servicer": With respect to (a) the Group A Loans and related
Junior Loans or Companion Loans and any related REO Properties, and any matters
relating to the foregoing, Master Servicer No. 1, and (b) the Group B Loans and
any related REO Properties, and any matters relating to the foregoing, Master
Servicer No. 2.

            "Master Servicer Account": As defined in Section 3.06(a).

            "Master Servicer No. 1": KRECM, in its capacity as master servicer
with respect to the Group A Loans and related Junior Loans or Companion Loans
and any related REO Properties hereunder, or any successor master servicer
appointed as provided herein with respect to the Group A Loans and related
Junior Loans and any related REO Properties.

            "Master Servicer No. 2": NCB, FSB, in its capacity as master
servicer with respect to the Group B Loans and any related REO Properties
hereunder, or any successor master servicer appointed as provided herein with
respect to the Group B Loans and any related REO Properties.

            "Master Servicer Remittance Date": With respect to any Distribution
Date, the Business Day preceding such Distribution Date, commencing in October
2006.

            "Master Servicing Fee": With respect to each Loan (and any successor
REO Loan with respect thereto), the fee payable to the applicable Master
Servicer pursuant to the first paragraph of Section 3.11(a), computed on the
same basis and in the same manner as interest is computed on the related Loan.
In the case of the 828-850 Madison Avenue Loan, "Loan" shall refer to the
828-850 Madison Avenue Loan REMIC Regular Interest for purposes of this
definition as the context requires.

            "Master Servicing Fee Rate": With respect to each Mortgage Loan and
REO Mortgage Loan, the rate per annum specified as such on the Mortgage Loan
Schedule; with respect to each NCB Loan (or any successor REO Loan with respect
thereof), 0.08% per annum; with respect to the 3434 North Washington Boulevard
Junior Loan, 0.01% per annum, with respect to the Companion Loan, 0.01% per
annum and with respect to the 828-850 Madison Avenue Junior Loan, 0.03% per
annum . In the case of the 828-850 Madison Avenue Loan, "Loan" shall refer to
the 828-850 Madison Avenue Loan REMIC Regular Interest for purposes of this
definition as the context requires.

            "Material Breach": As defined in Section 2.03(b).

            "Material Document Defect": As defined in Section 2.03(b).

            "Maturity Date": With respect to any Loan, Companion Loan or Junior
Loan, as of any date of determination, the date on which the last payment of
principal is due and payable under the related Note, after taking into account
all Principal Prepayments received prior to such date of determination, but
without giving effect to (i) any acceleration of the principal of such Loan,
Companion Loan or Junior Loan by reason of default thereunder, (ii) any grace
period permitted by the related Note or (iii) any modification, waiver or
amendment of such Loan, Companion Loan or Junior Loan granted or agreed to by
the applicable Master Servicer or Special Servicer pursuant to Section 3.20
occurring prior to such date of determination.

            "Mezzanine Loan": Any loan constituting "Mezzanine Debt," a
"Mezzanine Loan" or "Future Mezzanine Debt" as identified in Exhibit C-2 hereto.

             "Mezzanine Loan Collateral": With respect to any Mezzanine Loan, any
stock, partnership interests, membership interests or other equity interest in
the related Borrower that has been pledged pursuant to such Mezzanine Loan.

            "Mezzanine Loan Holder": With respect to any Mezzanine Loan, the
Holder or obligee thereof.

            "Monthly Interest Distribution Amount": As to any Distribution Date
and any Class of Regular Certificates and the Class A-4FL Regular Interest, an
amount of interest equal to (a) the Accrued Certificate Interest Amount for such
Class for such Distribution Date, reduced (to not less than zero) by (b) that
portion, if any, of the Uncovered Prepayment Interest Shortfall Amount, if any,
for such Distribution Date that is allocable to such Class pursuant to Section
4.05(a). As to any Distribution Date and any Uncertificated Lower-Tier Interest,
an amount of interest equal to (a) the Uncertificated Accrued Interest Amount
for such Uncertificated Lower-Tier Interest for such Distribution Date, reduced
(to not less than zero) by (b) that portion, if any, of the Uncovered Prepayment
Interest Shortfall Amount, if any, for such Distribution Date that is allocable
to such Uncertificated Lower-Tier Interest pursuant to Section 4.05(b). As to
any Distribution Date and the 828-850 Madison Avenue Loan REMIC Regular
Interest, an amount of interest equal to (a) the Uncertificated Accrued Interest
Amount for the 828-850 Madison Avenue Loan REMIC Regular Interest for such
Distribution Date, reduced (to not less than zero) by (b) that portion, if any,
of the Uncovered Prepayment Interest Shortfall Amount, if any, for such
Distribution Date, that is allocable to the 828-850 Madison Avenue Loan REMIC
Regular Interest pursuant to Section 4.05. As to any Distribution Date and any
Component of the Class A-X and Class A-SP Certificates, an amount of interest
equal to (a) the Accrued Component Interest Amount for such Component for such
Distribution Date, reduced (to not less than zero) by (b) that portion, if any,
of the Uncovered Prepayment Interest Shortfall Amount, if any, for such
Distribution Date that is allocable to such Component pursuant to Section
4.05(a).

            "Monthly Payment": With respect to any Loan (other than any REO
Loan) and any Due Date, the scheduled monthly payment of principal, if any, and
interest at the Mortgage Rate, excluding any Balloon Payment, which is payable
by the related Borrower on such Due Date under the related Note (as such terms
may be changed or modified in connection with a bankruptcy or similar proceeding
involving the related Borrower or by reason of a modification, waiver or
amendment of such Loan granted or agreed to by the applicable Master Servicer or
Special Servicer pursuant to Section 3.20), without regard to any acceleration
of principal of such Loan by reason of a default thereunder. With respect to an
REO Loan, the monthly payment that would otherwise have been payable on the
related Due Date had the related Note not been discharged, determined as set
forth in the preceding sentence and on the assumption that all other amounts, if
any, due thereunder are paid when due.

            "Moody's": Moody's Investors Service, Inc. or its successor in
interest. If neither such rating agency nor any successor remains in existence,
"Moody's" shall be deemed to refer to such other nationally recognized
statistical rating agency or other comparable Person designated by the
Depositor, notice of which designation shall be given to the other parties
hereto, and specific ratings of Moody's Investors Service, Inc. herein
referenced shall be deemed to refer to the equivalent ratings of the party so
designated. References herein to "applicable rating category" (other than such
references to "highest applicable rating category") shall, in the case of
Moody's, be deemed to refer to such applicable rating category of Moody's,
without regard to any plus or minus or other comparable rating qualification.

            "Mortgage": With respect to any Loan or Junior Loan, the mortgage,
deed of trust, deed to secure debt or other instrument securing a Note and
creating a lien on the related Mortgaged Property.

            "Mortgage File":

            With respect to any Loan, the following documents on a collective
basis:

                  (i) the original Note (or for the Ritz Carlton Mortgage Loan,
            Notes, or a lost note affidavit with a customary indemnification
            provision), bearing, or accompanied by, all prior and intervening
            endorsements, assignments or allonges showing a complete chain of
            endorsement or assignment from the applicable Mortgage Loan
            Originator either in blank or to the applicable Mortgage Loan
            Seller, and further endorsed (at the direction of the Depositor
            given pursuant to the related Mortgage Loan Purchase Agreement) by
            the applicable Mortgage Loan Seller, on its face or by allonge
            attached thereto, without recourse, either in blank or to the order
            of the Trustee in the following form: "Pay to the order of Wells
            Fargo Bank, N.A., as trustee for the registered Holders of Credit
            Suisse First Boston Mortgage Securities Corp., Commercial Mortgage
            Pass-Through Certificates, Series 2006-C4, without recourse,
            representation or warranty, express or implied";

                  (ii) a duplicate original Mortgage or a counterpart thereof,
            or if such Mortgage has been returned by the related recording
            office, (A) an original, (B) a certified copy or (C) a copy thereof
            from the applicable recording office, and originals or counterparts
            (or originals, certified copies or copies from the applicable
             recording office) of any intervening assignments thereof from the
            related Mortgage Loan Originator to the applicable Mortgage Loan
            Seller, in each case in the form submitted for recording or, if
            recorded, with evidence of recording indicated thereon;

                  (iii) an original assignment of the Mortgage, in recordable
            form (except for any missing recording information and, if
            applicable, completion of the name of the assignee), from the
            applicable Mortgage Loan Seller (or the applicable Mortgage Loan
            Originator) either in blank or to "Wells Fargo Bank, N.A., as
            trustee for the registered Holders of Credit Suisse First Boston
            Mortgage Securities Corp., Commercial Mortgage Pass-Through
            Certificates, Series 2006-C4";

                  (iv) an original, counterpart or copy of any related
            Assignment of Leases (if such item is a document separate from the
            Mortgage) and the originals, counterparts or copies of any
            intervening assignments thereof from the applicable Mortgage Loan
            Originator of the Loan to the applicable Mortgage Loan Seller, in
            each case in the form submitted for recording or, if recorded, with
            evidence of recording thereon;

                  (v) an original assignment of any related Assignment of Leases
            (if such item is a document separate from the Mortgage and to the
            extent not already assigned pursuant to clause (iii) above), in
            recordable form (except for any missing recording information and,
            if applicable, completion of the name of the assignee), from the
            applicable Mortgage Loan Seller (or the applicable Mortgage Loan
            Originator), either in blank or to "Wells Fargo Bank, N.A., as
            trustee for the registered Holders of Credit Suisse First Boston
            Mortgage Securities Corp., Commercial Mortgage Pass-Through
            Certificates, Series 2006-C4";

                  (vi) an original or copy of any related Security Agreement (if
            such item is a document separate from the Mortgage), and the
            originals or copies of any intervening assignments thereof from the
            applicable Mortgage Loan Originator to the applicable Mortgage Loan
            Seller;

                  (vii) an original assignment of any related Security Agreement
            (if such item is a document separate from the Mortgage and to the
            extent not already assigned pursuant to clause (iii) above), from
            the applicable Mortgage Loan Seller (or the applicable Mortgage Loan
            Originator), either in blank or to "Wells Fargo Bank, N.A., as
            trustee for the registered Holders of Credit Suisse First Boston
            Mortgage Securities Corp., Commercial Mortgage Pass-Through
            Certificates, Series 2006-C4," which assignment may be included as
            part of an omnibus assignment covering other documents relating to
            the Loan (provided that such omnibus assignment is effective under
            applicable law);

                  (viii) originals or copies of all (A) assumption agreements,
             (B) modifications, (C) written assurance agreements and (D)
            substitution agreements, together with any evidence of recording
            thereon or in the form submitted for recording, when appropriate, in
            those instances where the terms or provisions of the Mortgage, Note
            or any related security document have been modified or the Loan has
            been assumed;

                  (ix) the original lender's title insurance policy or a copy
            thereof (together with all endorsements or riders that were issued
            with or subsequent to the issuance of such policy), or if the policy
            has not yet been issued, the original or a copy of a binding written
            commitment (which may be a pro forma or specimen title insurance
            policy which has been accepted or approved in writing by the related
            title insurance company) or interim binder that is marked as binding
            and countersigned by the title company, insuring the priority of the
            Mortgage as a first lien on the related Mortgaged Property (which
            may be by means of executed escrow instructions), relating to such
            Loan;

                  (x) the original or a counterpart of any guaranty of the
            obligations of the Borrower under the Loan;

                  (xi) UCC acknowledgement, certified or other copies of all UCC
            Financing Statements and continuation statements which show the
            filing or recording thereof or copies thereof in the form submitted
            for filing or recording (including the filing number or other
            similar filing information) or, alternatively, other evidence of
            filing or recording (including the filing number or other similar
            filing information) acceptable to the Trustee (including, without
            limitation, evidence of such filed or recorded UCC Financing
            Statement as shown on a written UCC search report from a reputable
            search firm, such as CSC/LexisNexis Document Solutions, Corporation
            Service Company, CT Corporation System and the like or printouts of
            on-line confirmations from such UCC filing or recording offices or
            authorized agents thereof) sufficient to perfect (and maintain the
            perfection of) the security interest held by the related Mortgage
            Loan Originator (and each assignee of record prior to the Trustee)
            in and to the personalty of the Borrower at the related Mortgaged
            Property, and original UCC Financing Statement assignments, in a
            form suitable for filing or recording, sufficient to assign each
            such UCC Financing Statement to the Trustee;

                  (xii) the original or copy of the power of attorney (with
            evidence of recording thereon) granted by the Borrower if the
            Mortgage, Note or other document or instrument referred to above was
            not signed by the Borrower;

                  (xiii) either: (A) for NCB Loans, an original or copy of any
            subordination agreement, standstill agreement or other
            intercreditor, co-lender or similar agreement relating to
            subordinate indebtedness, including any mezzanine loan documents or
            preferred equity documents; or (B) for all other Loans with respect
            to any debt of a Borrower or mezzanine borrower permitted under the
            related Loan, an original or copy of a subordination agreement,
            standstill agreement or other intercreditor, co-lender or similar
            agreement relating to such other debt, if any, including any
            mezzanine loan documents or preferred equity documents, and a copy
            of the Note relating to such other debt (if such other debt is also
            secured by the related Mortgage);

                  (xiv) with respect to any Cash Collateral Accounts and
            Lock-Box Accounts, an original or copy of any related account
            control agreement;

                  (xv) an original or copy of any related Loan Agreement (if
            separate from the related Mortgage), and an original or copy of any
            related Lock-Box Agreement or Cash Collateral Account Agreement (if
            separate from the related Mortgage and Loan Agreement);

                  (xvi) the originals of letters of credit, if any, relating to
            the Loans and amendments thereto which entitle the Trust to draw
            thereon; provided that in connection with the delivery of the
            Mortgage File to the Trust, such originals shall be delivered to the
            applicable Master Servicer and copies thereof shall be delivered to
             the Trustee;

                  (xvii) any related environmental insurance policies and any
            environmental guarantees or indemnity agreements or copies thereof;

                  (xviii) originals or copies of the ground lease, ground lease
            memorandum and ground lease estoppels, if any, and any originals or
            copies of amendments, modifications or extensions thereto, if any;

                  (xix) for properties other than residential cooperative
            properties, the original or copy of any property management
            agreement;

                  (xx) copies of franchise agreements and franchisor comfort
            letters, if any, for hospitality properties and any applicable
            transfer/assignment documents;

                  (xxi) except in the case of NCB Loans, the checklist of the
            related Loan Documents, if any, that is included in the Mortgage
            File for the related Loan;

                  (xxii) a copy of the mortgage note evidencing the related
            Companion Loan or Junior Loan;

                  (xxiii) any additional documents required to be added to the
            Mortgage File pursuant to this Agreement; and

                  (xxiv) with respect to the 828-850 Madison Avenue Loan, the
            original or a copy of the related REMIC Declaration.

            Whenever the term "Mortgage File" is used to refer to documents
actually received by the Trustee, such term shall not be deemed to include such
documents and instruments required to be included therein unless they are
actually so received.

            With respect to the Ritz Carlton Mortgage Loan, the delivery of the
Mortgage File by either BCRE or Column shall satisfy the delivery requirements
for both BCRE and Column.

            "Mortgage Interest Accrual Period": With respect to any Loan, the
period during which interest accrues pursuant to the related Note.

            "Mortgage Loan Originator": Any institution that originated a Loan.

             "Mortgage Loan Purchase Agreement": Any of the CSMC Mortgage Loan
Purchase Agreement, the LaSalle Mortgage Loan Purchase Agreement, the KeyBank
Mortgage Loan Purchase Agreement, the BCRE Mortgage Loan Purchase Agreement or
the NCB, FSB Mortgage Loan Purchase Agreement.

            "Mortgage Loan Schedule": The list of Loans transferred on the
Closing Date to the Trustee as part of the Trust Fund, attached hereto as
Exhibit B, which list sets forth the following information with respect to each
Loan:

                  (i) the loan number (as specified in Annex A to the Prospectus
            Supplement);

                  (ii) the property name;

                  (iii) the street address (including city, state and zip code)
            of the related Mortgaged Property;

                  (iv) the Mortgage Rate in effect at the Cut-off Date;

                  (v) the Net Mortgage Rate in effect at the Cut-off Date;

                  (vi) the original principal balance;

                  (vii) the Cut-off Date Principal Balance;

                  (viii) the (a) remaining term to stated maturity, (b) Maturity
            Date and (c) with respect to each ARD Loan, the Anticipated
            Repayment Date;

                  (ix) the original and remaining amortization terms;

                  (x) the amount of the Monthly Payment due on the first Due
            Date following the Cut-off Date;

                  (xi) the number of units, pads, rooms or square footage with
            respect to the Mortgaged Property;

                  (xii) the Loan interest accrual method;

                  (xiii) the total of the Trustee Fee Rate, the applicable
            Primary Servicing Fee Rate, the applicable Master Servicing Fee Rate
            and the applicable Broker Strip Rate, if any;

                  (xiv) the Due Date;

                  (xv) whether such loan is an ARD Loan;

                  (xvi) whether the Loan is subject to lockout/defeasance;

                  (xvii) whether the related Mortgaged Property was covered by
            earthquake insurance at the time of origination, or if the loan
            documents require such insurance;

                  (xviii) whether such Loan has the benefit of an Environmental
             Insurance Policy;

                  (xix) whether such Loan is secured by the related Borrower's
            interest in ground leases;

                  (xx) which Servicing Group includes such Loan;

                  (xxi) if such Loan is a Co-op Loan, the Initial LTV Co-op
            Basis; and

                  (xxii) whether such Loan is secured by a letter of credit.

            Such Mortgage Loan Schedule also shall set forth the aggregate of
the amounts described under clause (vii) above for all of the Loans. Such list
may be in the form of more than one list, collectively setting forth all of the
information required.

            "Mortgage Loan Seller": Any of (i) the CSMC Mortgage Loan Seller,
(ii) the LaSalle Mortgage Loan Seller, (iii) the KeyBank Mortgage Loan Seller,
(iv) the BCRE Mortgage Loan Seller and (v) the NCB, FSB Mortgage Loan Seller.

            "Mortgage Pool": All of the Loans and any successor REO Loans with
respect thereto, collectively, as of any particular date of determination. The
Mortgage Pool shall not include any Companion Loan or Junior Loan.

            "Mortgage Rate": With respect to: (i) any Loan, Companion Loan or
Junior Loan on or prior to its Maturity Date, the annual rate at which interest
is scheduled (in the absence of a default and without giving effect to any
Revised Rate) to accrue on such Loan, Companion Loan or Junior Loan, as the case
may be from time to time in accordance with the related Note and applicable law;
(ii) any Loan, Companion Loan or Junior Loan after its Maturity Date, the
annualized rate described in clause (i) above determined without regard to the
passage of such Maturity Date; and (iii) any REO Loan, the annualized rate
described in clause (i) or (ii), as applicable, above, determined as if the
predecessor Loan, Companion Loan or Junior Loan, as the case may be, had
remained outstanding. In the case of the 828-850 Madison Avenue Loan, "Loan"
shall refer to the 828-850 Madison Avenue Loan REMIC Regular Interest for
purposes of this definition and not the underlying Loan or REO Loan.

            "Mortgaged Property": The underlying real property (including any
REO Property) that secures a Loan or Loan Combination, in each case consisting
of a parcel or parcels of land improved by a commercial and/or multifamily
building or facility, together with any personal property (to the extent the
same are owned by the Borrower and necessary in connection with the operation of
the related property), fixtures, leases and other property or rights pertaining
thereto.

            "NCB/FSB Loans": The mortgage loans transferred to the Depositor
pursuant to the NCB/FSB Mortgage Loan Purchase Agreement and identified on
Schedule II thereto, together with any mortgage loans substituted in replacement
thereof pursuant to the NCB/FSB Mortgage Loan Purchase Agreement.

            "NCB, FSB Mortgage Loan Purchase Agreement": The agreement between
the Depositor as purchaser and the NCB, FSB Mortgage Loan Seller as seller,
dated as of September 1, 2006, relating to the transfer of all of the NCB, FSB
Mortgage Loan Seller's right, title and interest in and to the mortgage loans
identified on Schedule II thereto.

            "NCB, FSB Mortgage Loan Seller": NCB, FSB, a federal savings bank,
or its successor in interest.

            "NCB Subordinate Debt Conditions": With respect to a Borrower
encumbering a Mortgaged Property relating to an NCB, FSB Loan that is a Co-op
Loan with a subordinate mortgage, the following conditions: (i) each of the
loans, or the sole loan, to be secured by each such subordinate mortgage is made
by NCB, FSB or any Affiliate thereof, (ii) each such subordinate mortgage is
expressly subject and subordinate to the lien of the Mortgage encumbering the
Mortgaged Property in question, (iii) each such subordinate mortgage is
expressly made in compliance with the underwriting standards which NCB, FSB
customarily employs in connection with making subordinate mortgages for its own
mortgage loan portfolio, (iv) as of the date of the closing of the subordinate
mortgage loan in question, the New Loan-to-Value Ratio (as defined below) does
not exceed 40%, (v) NCB, FSB or any Affiliate thereof that originates the
subordinate mortgage loan, executes and delivers to the Trustee a subordination
agreement with respect to such subordinate mortgage in substantially the form of
Exhibit Q hereto (provided that the Trustee shall have no responsibility for
determining the sufficiency or validity thereof), (vi) if the subordinate
mortgage loan will not be a fully amortizing loan, the stated maturity date of
the subordinate mortgage loan shall be no earlier than the maturity date of the
related Co-op Loan, (vii) the subordinate mortgage loan shall have interest
payable on a current basis, with no deferral, (viii) the subordinate mortgage
loan is made principally for the purpose of funding capital expenditures, major
repairs or reserves at or with respect to the Mortgaged Property in question and
(ix) the aggregate amount of subordinate debt encumbering the Mortgaged Property
in question does not exceed $7,500,000. For purposes of this definition, and
notwithstanding anything herein to the contrary: "Mortgage Debt" shall mean the
sum of (x) the aggregate outstanding principal balance of all loans secured by
one or more mortgages then encumbering the Mortgaged Property in question
(including the related Co-op Loan and any then existing subordinate mortgage
loans) and (y) the principal amount of the proposed new subordinate mortgage
loan; "New Loan-to-Value Ratio" shall mean, as of any date for any Co-op Loan,
the fraction, expressed as a percentage, the numerator of which is the Mortgage
Debt for the related Mortgaged Property on such date, and the denominator of
which is the Appraised Value of the related Mortgaged Property; and "Appraisal"
shall mean an appraisal of the applicable Mortgaged Property by an Appraiser
made in conformance with NCB, FSB's customary underwriting requirements, not
more than one year prior to the origination date of the related Co-op Loan and
reviewed by Master Servicer No. 2.

            "Net Investment Earnings": With respect to any Collection Account,
any Lock-Box Account, any Cash Collateral Account, any Servicing Account or any
REO Account, for any period beginning on a Distribution Date and ending on the
following Master Servicer Remittance Date, the amount, if any, by which the
aggregate of all interest and other income realized during such period on funds
relating to the Trust Fund held in such account (and which is not required to be
paid to the related Borrower) exceeds the aggregate of all losses, if any,
incurred during such period in connection with the investment of such funds in
such account in accordance with Section 3.06.

            "Net Investment Loss": With respect to any of any Collection
Account, any Lock-Box Account, any Cash Collateral Account, any Servicing
Account or any REO Account for any period beginning on a Distribution Date and
ending on the following Master Servicer Remittance Date, the amount, if any, by
which the aggregate of all losses, if any, incurred during such period in
connection with the investment of funds relating to the Trust Fund held in such
account (and which investment is not directed by the related Borrower) in
accordance with Section 3.06 exceeds the aggregate of all interest and other
income realized during such period on such funds in such account.

            "Net Mortgage Pass-Through Rate":

            (A) With respect to any Loan (or any successor REO Loan with respect
thereto) that accrues interest on a 30/360 Basis, for any Distribution Date, an
annual rate equal to the Original Net Mortgage Rate for such Loan (or, in the
case of a Specially Designated Co-op Loan (or any successor REO Loan with
respect thereto), such Original Net Mortgage Rate minus 0.10% per annum); and

            (B) With respect to any Loan (or any successor REO Loan with respect
thereto) that accrues interest on an Actual/360 Basis and the 828-850 Madison
Avenue Loan REMIC Regular Interest, for any Distribution Date, an annual rate
generally equal to twelve times a fraction, expressed as a percentage:

            (1)    the numerator of which fraction is, subject to adjustment as
                  described below in this definition, an amount of interest
                   equal to the product of (a) the number of days in the related
                  Interest Accrual Period, multiplied by (b) the Stated
                  Principal Balance of such Loan (or such REO Loan) immediately
                  preceding such Distribution Date, multiplied by (c) 1/360,
                  multiplied by (d) the Original Net Mortgage Rate for such Loan
                  (or, in the case of a Specially Designated Co-op Loan (or any
                  successor REO Loan with respect thereto), such Original Net
                  Mortgage Rate minus 0.10% per annum); and

            (2)    the denominator of which is the Stated Principal Balance of
                  such Loan (or such REO Loan) immediately preceding that
                  Distribution Date.

            Notwithstanding the foregoing, if the subject Distribution Date
occurs during January, except during a leap year, or February of any year
subsequent to 2006 (unless the Final Distribution Date occurs in such month),
then the amount of interest referred to in the fractional numerator described in
clause (B)(1) above will be decreased to reflect any Withheld Amounts with
respect to the subject Loan (or REO Loan) transferred from the Distribution
Account to the Interest Reserve Account in such calendar month. Furthermore, if
the subject Distribution Date occurs during March of any year subsequent to 2006
(or February, if the final Distribution Date occurs in such month) then the
amount of interest referred to in the fractional numerator described in clause
(B)(1) above will be increased to reflect any Withheld Amounts with respect to
the subject Loan (or REO Loan) or 828-850 Madison Avenue Loan REMIC Regular
Interest transferred from the Interest Reserve Account to the Distribution
Account for distribution on such Distribution Date.

            "Net Mortgage Rate": With respect to any Loan, Junior Loan, 828-850
Madison Avenue Loan REMIC Regular Interest or REO Loan, as of any date of
determination, a per annum rate equal to the related Mortgage Rate then in
effect, minus the sum of the related Master Servicing Fee Rate, the related
Primary Servicing Fee Rate (if any), the related Broker Strip Rate (if any) and
the Trustee Fee Rate.

            "Net Operating Income": With respect to any Mortgaged Property
(other than a residential cooperative property), for any Borrower's fiscal year
end, the total operating revenues derived from such Mortgaged Property during
such period, minus the total operating expenses incurred in respect of such
Mortgaged Property during such period, other than (i) non-cash items such as
depreciation, (ii) amortization, (iii) actual capital expenditures and (iv) debt
service on the related Loan or Loan Combination, as applicable.

            "New Lease": Any lease of REO Property entered into at the direction
of the applicable Special Servicer on behalf of the Trust, including any lease
renewed, modified or extended on behalf of the Trust, if the Trust Fund has the
right to renegotiate the terms of such lease.

             "Nonrecoverable Advance": Any Nonrecoverable P&I Advance or
Nonrecoverable Servicing Advance or any portion thereof.

            "Nonrecoverable P&I Advance": The portion of any P&I Advance
(including interest accrued thereon at the Reimbursement Rate) previously made
or proposed to be made in respect of a Loan or REO Loan which, in the judgment
(exercised in accordance with the Servicing Standard in the case of the judgment
of a Master Servicer or Special Servicer) of the applicable Master Servicer, the
applicable Special Servicer or the Trustee, will not be ultimately recoverable,
together with any accrued and unpaid interest thereon, from Late Collections or
any other recovery on or in respect of such Loan or REO Loan. The determination
by a Master Servicer, a Special Servicer or the Trustee that it has made (or, in
the case of a determination made by the applicable Special Servicer, that a
Master Servicer has made) a Nonrecoverable P&I Advance or that any proposed P&I
Advance, if made, would constitute a Nonrecoverable P&I Advance, shall be
evidenced by an Officer's Certificate delivered (i) to the Trustee, the
Certificate Administrator and the Depositor, in the case of a Master Servicer,
(ii) to the applicable Master Servicer, the Certificate Administrator and the
Trustee in the case of a Special Servicer, (iii) to the Depositor, the
Certificate Administrator and the applicable Master Servicer, in the case of the
Trustee, and (iv) in each case, to the Directing Certificateholder, any
Requesting Subordinate Certificateholder (at the expense of such requesting
Holder) and, provided that the certifying party has actual knowledge of the
identity thereof, any related Junior or Companion Loan Holder(s) (or, in the
case of a Junior Loan or Companion Loan that is part of a rated commercial
mortgage securitization, to the related master servicer). Such Officer's
Certificate shall set forth such determination of nonrecoverability and the
considerations of the applicable Master Servicer, the applicable Special
Servicer, or the Trustee, as the case may be, forming the basis of such
determination (which shall include but shall not be limited to information, to
the extent available, such as related income and expense statements, rent rolls,
occupancy status, property inspections, and shall include an Appraisal (provided
that if an Appraisal has been obtained within the past 12 months, no new
Appraisal is required) of the related Mortgaged Property, the cost of which
Appraisal shall be advanced by the applicable Master Servicer as a Servicing
Advance or, depending on the timing of payment, subject to Section 3.03(c), paid
out of the applicable Collection Account). In addition, in considering whether a
P&I Advance is nonrecoverable, the applicable Master Servicer, the applicable
Special Servicer or the Trustee, as applicable, will be entitled to give due
regard to the existence of any outstanding Nonrecoverable Advance or
Workout-Delayed Reimbursement Amount with respect to any other Trust Mortgage
Loans or REO Trust Mortgage Loans the reimbursement of which, at the time of
such consideration, is being deferred or delayed by the applicable Master
Servicer or the Trustee because there is insufficient principal available for
such reimbursement, in light of the fact that proceeds of the Trust Mortgage
Loan or REO Trust Mortgage Loan as to which a nonrecoverability determination is
being made are a source of reimbursement not only for the P&I Advance under
consideration, but also as a potential source of the reimbursement of the
outstanding Nonrecoverable Advance or Workout-Delayed Reimbursement Amount being
delayed or deferred. The Officer's Certificate referred to in the second
preceding sentence shall be accompanied by the Appraisal and all other
supporting documentation relevant to the subject parties' nonrecoverability
determination. The Trustee shall be entitled to conclusively rely on the
applicable Master Servicer's determination that a P&I Advance is nonrecoverable.
The applicable Master Servicer and the Trustee shall conclusively rely on and be
bound by the applicable Special Servicer's determination that a P&I Advance is
nonrecoverable, provided, however, that in the absence of such determination by
the applicable Special Servicer, the applicable Master Servicer and the Trustee
will be entitled to make their own determination that a P&I Advance is
nonrecoverable, and in no event shall a determination by the applicable Special
Servicer that a previously made or proposed P&I Advance would be recoverable be
binding on the applicable Master Servicer or Trustee. Any determination made by
the Master Servicer or any master servicer of the 280 Park Avenue Companion Loan
(upon the securitization of such loan which is rated by one or more Rating
Agencies) regarding the nonrecoverability of any P&I Advance with respect to any
portion of the 280 Park Avenue Total Loan will be binding on the Trust Fund and
the trust fund containing the 280 Park Avenue Companion Loan.

            "Nonrecoverable Servicing Advance": The portion of any Servicing
Advance (including interest accrued thereon at the Reimbursement Rate)
previously made or proposed to be made in respect of a Loan or REO Property
which, in the judgment (exercised in accordance with the Servicing Standard in
the case of the judgment of a Master Servicer or Special Servicer) of the
applicable Master Servicer, the applicable Special Servicer or the Trustee, will
not be ultimately recoverable, together with any accrued and unpaid interest
thereon, from Late Collections or any other recovery on or in respect of such
Loan or REO Property. The determination by a Master Servicer, a Special Servicer
or the Trustee that it has made (or, in the case of a determination made by the
applicable Special Servicer, that a Master Servicer has made) a Nonrecoverable
Servicing Advance or that any proposed Servicing Advance, if made, would
constitute a Nonrecoverable Servicing Advance, shall be evidenced by an
Officer's Certificate delivered (i) to the Trustee, the Certificate
Administrator and the Depositor, in the case of a Master Servicer, (ii) to the
applicable Master Servicer, the Certificate Administrator and the Trustee in the
case of a Special Servicer, (iii) to the Depositor, the Certificate
Administrator and the applicable Master Servicer, in the case of the Trustee,
and (iv) and in each case, to the Directing Certificateholder, any Requesting
Subordinate Certificateholder (at the expense of such requesting Holder) and,
provided that the certifying party has actual knowledge of the identity thereof,
any related Junior or Companion Loan Holder(s) (or, in the case of a Junior Loan
or Companion Loan that is part of a rated commercial mortgage securitization, to
the related master servicer). Such Officer's Certificate shall set forth such
determination of nonrecoverability and the considerations of the applicable
Master Servicer, the applicable Special Servicer or the Trustee, as the case may
be, forming the basis of such determination (which shall include but shall not
be limited to information, to the extent available, such as related income and
expense statements, rent rolls, occupancy status and property inspections, and
shall include an Appraisal (provided that if an Appraisal has been obtained
within the past 12 months, no new Appraisal is required) of the related
Mortgaged Property, the cost of which Appraisal shall be advanced by the
applicable Master Servicer as a Servicing Advance or, depending on the timing of
payment, subject to Section 3.03(c), paid out of the applicable Collection
Account). In addition, in considering whether a Servicing Advance is
nonrecoverable, the applicable Master Servicer, the applicable Special Servicer
or the Trustee, as applicable, will be entitled to give due regard to the
existence of any outstanding Nonrecoverable Advance or Workout-Delayed
Reimbursement Amount with respect to any other Trust Mortgage Loans or REO Trust
Mortgage Loans the reimbursement of which, at the time of such consideration, is
being deferred or delayed by the applicable Master Servicer or the Trustee
because there is insufficient principal available for such reimbursement, in
light of the fact that proceeds of the Trust Mortgage Loan or REO Trust Mortgage
Loan as to which a nonrecoverability determination is being made are a source of
reimbursement not only for the Servicing Advance under consideration, but also
as a potential source of the reimbursement of the outstanding Nonrecoverable
Advance or Workout-Delayed Reimbursement Amount being delayed or deferred. The
Officer's Certificate referred to in the second preceding sentence shall be
accompanied by the Appraisal and all other supporting documentation relevant to
the subject parties' nonrecoverability determination. The Trustee will be
entitled to conclusively rely on the applicable Master Servicer's determination
that a Servicing Advance is nonrecoverable. The applicable Master Servicer and
the Trustee shall conclusively rely on and be bound by the applicable Special
Servicer's determination that a Servicing Advance is a Nonrecoverable Servicing
Advance, provided, however, that in the absence of such determination by the
applicable Special Servicer, the applicable Master Servicer and the Trustee will
be entitled to make their own determination that a Servicing Advance is a
Nonrecoverable Servicing Advance, and in no event shall a determination by the
applicable Special Servicer that a previously made or proposed Servicing Advance
would be recoverable be binding on the applicable Master Servicer or Trustee.

            "Non-Registered Certificate": Any Certificate that has not been
subject to registration under the Securities Act. As of the Closing Date, the
Class A-X, Class A-SP, Class A-Y, Class B, Class C, Class D, Class E, Class F,
Class G, Class H, Class J, Class K, Class L, Class M, Class N, Class O, Class P,
Class Q, Class S, Class R and Class V Certificates will constitute
Non-Registered Certificates.

            "Non-United States Tax Person": Any Person other than a United
States Tax Person.

            "Note": The original executed note (or, if applicable, multiple
notes collectively) evidencing the indebtedness of a Borrower under a Loan or
Junior Loan, as the case may be, together with any rider, addendum or amendment
thereto.

            "NRSRO": A nationally recognized statistical rating organization as
the term is used in federal securities laws.

            "Officer's Certificate": A certificate signed by a Servicing Officer
of a Master Servicer or a Special Servicer, as the case may be, or a Responsible
Officer of the Trustee or the Certificate Administrator, as the case may be.

            "Opinion of Counsel": A written opinion of counsel, who may be
salaried counsel for the Depositor, a Master Servicer or a Special Servicer,
acceptable in form and delivered to the Trustee and the Certificate
Administrator, except that any opinion of counsel relating to (a) the
qualification of any Trust REMIC as a REMIC, (b) compliance with the REMIC
Provisions or (c) the resignation of the Depositor, a Master Servicer or a
Special Servicer pursuant to Section 6.04 must be an opinion of counsel that is
in fact Independent of the Depositor, the Master Servicer or the Special
Servicer, as applicable.

            "Optimal Interest Distribution Amount": As to any Distribution Date
and any Class of Regular Certificates (other than the Class A-4FL Certificates)
and the Class A-4FL Regular Interest, the sum of the Monthly Interest
Distribution Amount and the Unpaid Interest Shortfall Amount for such Class for
such Distribution Date. As to any Distribution Date and any Uncertificated
Lower-Tier Interest, the sum of the Monthly Interest Distribution Amount and the
Unpaid Interest Shortfall Amount for such Uncertificated Lower-Tier Interest for
such Distribution Date. As to any Distribution Date and the 828-850 Madison
Avenue Loan REMIC Regular Interest, the sum of the Monthly Interest Distribution
Amount and the Unpaid Interest Shortfall Amount for the 828-850 Madison Avenue
Loan REMIC Regular Interest for such Distribution Date.

            "Original Class Principal Balance": With respect to the Class A-4FL
Regular Interest or any Class of Sequential Pay Certificates (other than the
Class A-4FL Certificates), the initial aggregate principal amount thereof as of
the Closing Date, in each case as specified in the Preliminary Statement hereto,
and with respect to the Class A-4FL Certificates, $150,000,000.

            "Original Lower-Tier Notional Balance": With respect to the Class
LA-Y Lower-Tier Interest, the initial notional balance thereof as of the Closing
Date, as specified in the Preliminary Statement hereto.

            "Original Lower-Tier Principal Amount": With respect to any
Uncertificated Lower-Tier Interest (other than the Class LA-Y Lower-Tier
Interest), the principal amount thereof as of the Closing Date, in each case as
specified in the Preliminary Statement hereto.

            "Original Net Mortgage Rate": With respect to any Loan, the Net
Mortgage Rate in effect for such Loan as of the Closing Date (or, in the case of
any Loan substituted in replacement of another Loan pursuant to or as
contemplated by the related Mortgage Loan Purchase Agreement, as of the date of
substitution). In the case of the 828-850 Madison Avenue Loan, "Loan" shall
refer to the 828-850 Madison Avenue Loan REMIC Regular Interest for purposes of
this definition and not the underlying Loan or REO Loan.

            "Original Class Notional Amount": With respect to any Class of
Interest-Only Certificates, the initial aggregate notional balance thereof as of
the Closing Date, in each case as specified in the Preliminary Statement hereto.

            "Original Value": The Appraised Value of a Mortgaged Property based
upon the Appraisal conducted in connection with the origination of the related
Loan.

             "Origination Required Insurance Amounts": As defined in Section
3.07(h).

            "OTS": The Office of Thrift Supervision or any successor thereto.

            "Ownership Interest": As to any Certificate, any ownership or
security interest in such Certificate as the Holder thereof and any other
interest therein, whether direct or indirect, legal or beneficial, as owner or
as pledgee.

            "P&I Advance": As to any Loan (or any successor REO Loan with
respect thereto), any advance made by the Master Servicer or the Trustee, as
applicable, pursuant to Section 4.03 or Section 7.05.

            "P&I Advance Determination Date": With respect to any Distribution
Date, the second Business Day immediately prior thereto.

            "Pass-Through Rate": With respect to each Class of Certificates and
the Class A-4FL Regular Interest, the respective per annum rate listed below:

Class A-1:                 Class A-1 Pass-Through Rate
Class A-1-A:               Class A-1-A Pass-Through Rate
Class A-2:                  Class A-2 Pass-Through Rate
Class A-AB:                Class A-AB Pass-Through Rate
Class A-3:                 Class A-3 Pass-Through Rate
Class A-4FL Regular        Class A-4FL Regular Interest
  Interest                   Pass-Through Rate
Class A-4FL                Class A-4FL Pass-Through Rate
Class A-X:                 Class A-X Pass-Through Rate
Class A-SP                 Class A-SP Pass-Through Rate
Class A-Y:                 Class A-Y Pass-Through Rate
Class A-M:                 Class A-M Pass-Through Rate
Class A-J:                 Class A-J Pass-Through Rate
Class B:                   Class B Pass-Through Rate
Class C:                   Class C Pass-Through Rate
Class D:                   Class D Pass-Through Rate
Class E:                   Class E Pass-Through Rate
Class F:                   Class F Pass-Through Rate
Class G:                   Class G Pass-Through Rate
Class H:                   Class H Pass-Through Rate
Class J:                   Class J Pass-Through Rate
Class K:                   Class K Pass-Through Rate
Class L:                   Class L Pass-Through Rate
Class M:                   Class M Pass-Through Rate
Class N:                   Class N Pass-Through Rate
Class O:                   Class O Pass-Through Rate
Class P:                   Class P Pass-Through Rate
Class Q:                   Class Q Pass-Through Rate
Class S:                   Class S Pass-Through Rate

            "PCAOB": The Public Company Accounting Oversight Board.

            "Penalty Charges": With respect to any Loan, Junior Loan or REO
Loan, any amounts actually collected thereon from the Borrower that represent
late payment charges or Default Interest.

            "Percentage Interest": As to any Certificate, the percentage
interest evidenced thereby in distributions required to be made with respect to
the related Class. With respect to any Regular Certificate, the percentage
interest equal to the denomination of such Certificate, as set forth on the face
thereof, divided by the initial Class Principal Balance (or, in the case of a
Class of Interest-Only Certificates, the Class Notional Amount) of such Class of
Certificates as of the Closing Date. With respect to a Class V or Class R
Certificate, the percentage interest as set forth on the face thereof.

            "Performance Certification": As defined in Section 11.08.

            "Performing Party": As defined in Section 11.14.

            "Permitted Investments": Any one or more of the following
obligations or securities, regardless whether issued by the Depositor, a Master
Servicer, a Special Servicer, the Trustee, the Certificate Administrator or any
of their respective Affiliates and having the required ratings, if any, provided
for in this definition:

            (i) direct obligations of, and obligations fully guaranteed as to
      timely payment of principal and interest by, the United States of America,
      FNMA, FHLMC or any agency or instrumentality of the United States of
      America, provided such obligations have a remaining term to maturity of
       one year or less from the date of acquisition and which are backed by the
      full faith and credit of the United States of America; provided that any
      obligation of, or guarantee by, FNMA or FHLMC, other than an unsecured
      senior debt obligation of FNMA or FHLMC, shall be a Permitted Investment
      only if such investment would not result in the downgrading, withdrawal or
      qualification of then-current rating assigned by each Rating Agency to any
      Certificate as confirmed in writing;

            (ii) time deposits, unsecured certificates of deposit or bankers'
      acceptances that mature in one year or less after the date of issuance and
      are issued or held by any depository institution or trust company
      incorporated or organized under the laws of the United States of America
      or any State thereof and subject to supervision and examination by federal
      or state banking authorities, so long as the commercial paper or other
      short-term debt obligations of such depository institution or trust
      company are rated in the highest short-term debt rating category of each
      Rating Agency or such other ratings as will not result in the downgrading,
      withdrawal or qualification of then-current rating assigned by each Rating
      Agency to any Certificate, as confirmed in writing by such Rating Agency;

            (iii) repurchase agreements or obligations with respect to any
      security described in clause (i) above where such security has a remaining
      maturity of one year or less and where such repurchase obligation has been
      entered into with a depository institution or trust company (acting as
      principal) described in clause (ii) above;

            (iv) debt obligations maturing in one year or less from the date of
      acquisition bearing interest or sold at a discount issued by any
      corporation incorporated under the laws of the United States of America or
      any state thereof, which securities have (i) ratings in the highest
      long-term unsecured debt rating category of each Rating Agency or (ii)
      such other ratings (as confirmed by the applicable Rating Agency in
      writing) as will not result in a downgrade, qualification or withdrawal of
      then-current rating of the Certificates that are currently being rated by
      such Rating Agency; provided, however, that securities issued by any
      particular corporation will not be Permitted Investments to the extent
      that investment therein will cause the then outstanding principal amount
      of securities issued by such corporation and held in the accounts
      established hereunder to exceed 10% of the sum of the aggregate principal
      balance and the aggregate principal amount of all Permitted Investments in
      such accounts;

            (v) commercial paper (including both non-interest-bearing discount
      obligations and interest-bearing obligations) payable on demand or on a
      specified date maturing in one year or less after the date of issuance
      thereof and which is rated in the highest short-term unsecured debt rating
      category of each Rating Agency;

            (vi) units of investment funds that maintain a constant net asset
      value and money market funds having the highest rating from each Rating
      Agency for money market funds; and

            (vii) any other demand, money market or time deposit, obligation,
      security or investment, with respect to which each Rating Agency shall
      have confirmed in writing that such investment will not result in a
      downgrade, qualification or withdrawal of then-current rating of the
      Certificates that are currently being rated by such Rating Agency;

provided that such instrument or security qualifies as a "cashflow investment"
pursuant to Section 860G(a)(6) of the Code; interest on any variable rate
instrument shall be tied to a single interest rate index plus a single fixed
spread (if any) and move proportionally with that index; and, if rated by S&P,
the obligation must not have an "r" highlighter affixed to its rating, and must
have a predetermined fixed dollar of principal due at maturity that cannot vary
or change.

            "Permitted Mezzanine Loan Holder": With respect to any Mezzanine
Loan, the related Mortgage Loan Seller, any Institutional Lender/Owner or any
other Mezzanine Loan Holder with respect to which each Rating Agency has
confirmed in writing to the applicable Special Servicer and the Trustee that the
holding of such Mezzanine Loan by such Person would not cause a qualification,
downgrade or withdrawal of any of such Rating Agency's then-current ratings on
the Certificates.

            "Permitted Transferee": Any Transferee of a Class R Certificate
other than a Disqualified Organization, a Non-United States Tax Person or a
foreign permanent establishment or fixed base (each within the meaning of the
applicable income tax treaty) of a United States Tax Person; provided, however,
that if a Transferee is classified as a partnership under the Code, such
Transferee shall only be a Permitted Transferee if all of its direct or indirect
(except through a U.S. corporation) beneficial owners are (and must be under the
applicable partnership agreement) United States Tax Persons and the governing
documents of the Transferee prohibit a transfer of any interest in the
Transferee to any Non-United States Tax Person.

            "Person": Any individual, corporation, partnership, limited
liability company, joint venture, association, joint-stock company, trust,
unincorporated organization or government or any agency or political subdivision
thereof.

            "Plan": Any of those retirement plans and other employee benefit
plans, including individual retirement accounts and annuities, Keogh plans and
collective investment funds and separate accounts in which such plans, accounts
or arrangements are invested, including insurance company general accounts, that
are subject to ERISA or the Code.

            "Prepayment Assumption": With respect to all Loans, the assumption
that all payments required to be made on such Loans according to their
contractual terms (including repayment in full on their respective maturity
dates) are so made; provided that, in the case of ARD Loans, it is further
assumed that such ARD Loans will be fully prepaid on their related Anticipated
Repayment Dates.

            "Prepayment Date": With respect to any Principal Prepayment, the
date on which such Principal Prepayment is to be made.

            "Prepayment Interest Excess": With respect to any Distribution Date,
for each Loan that was subject to a voluntary Principal Prepayment in full or in
part, or as to which Insurance and Condemnation Proceeds were received by a
Master Servicer or Special Servicer for application to such Loan, in each case
after the Due Date in the month of such Distribution Date and on or prior to the
related Determination Date, the amount of interest (net of related Master
Servicing Fees, Primary Servicing Fees and any Broker Strip Interest payable
therefrom) accrued at the Mortgage Rate for such Loan on the amount of such
Principal Prepayment or, insofar as these represent an early collection of
principal, such Insurance and Condemnation Proceeds after the end of the
Mortgage Interest Accrual Period relating to such Due Date and accruing in the
manner set forth in the Loan Documents relating to such Loan, to the extent such
interest is collected by or remitted to the applicable Master Servicer or
Special Servicer.

            "Prepayment Interest Shortfall": With respect to any Distribution
Date, for each Loan that was subject to a voluntary Principal Prepayment in full
or in part, or as to which Insurance and Condemnation Proceeds were received by
a Master Servicer or Special Servicer for application to such Loan, in each case
after the Determination Date in the calendar month preceding such Distribution
Date but prior to the Due Date in the related Due Period, the amount of interest
(net of related Master Servicing Fees, Primary Servicing Fees and any Broker
Strip Interest payable therefrom) that would have accrued at the Mortgage Rate
for such Loan, on the amount of such Principal Prepayment or, insofar as these
represent an early collection of principal, such Insurance and Condemnation
Proceeds during the period commencing on the date as of which such Principal
Prepayment or Insurance and Condemnation Proceeds were applied to the unpaid
principal balance of the subject Loan and ending on (and including) the day
immediately preceding such Due Date. A Prepayment Interest Shortfall in respect
of the 828-850 Madison Avenue Loan shall be a Prepayment Interest Shortfall in
respect of the 828-850 Madison Avenue Loan REMIC Regular Interest.

            "Primary Servicer": Any initial Master Servicer or any other
subservicer specifically identified as a "Primary Servicer" on Exhibit K hereto
or in a Sub-Servicing Agreement dated as of September 1, 2006 between a Master
Servicer and such subservicer, in its capacity as a primary servicer, or any
successors thereto. Notwithstanding any other provision herein to the contrary,
each initial Master Servicer shall be a "Primary Servicer" hereunder with
respect to the Loans for which it acts as a Master Servicer hereunder, and no
Sub-Servicing Agreement shall be required with respect to any such Primary
Servicer.

            "Primary Servicing Agreement": Each of the Sub-Servicing Agreements
dated as of September 1, 2006, by and between a Master Servicer and a Primary
Servicer.

            "Primary Servicing Fee": Any primary servicing fee payable to the
Primary Servicer pursuant to the Primary Servicing Agreement.

            "Principal Distribution Adjustment Amount": As to any Distribution
Date and any Servicing Group, the sum of (i) the amount of any Nonrecoverable
Advance (or interest thereon) that was reimbursed to the applicable Master
Servicer or the Trustee from such Servicing Group and that was deemed to have
been reimbursed out of principal collections that would otherwise constitute
part of the Principal Distribution Amount and (ii) any Workout-Delayed
Reimbursement Amount (or interest thereon) that was reimbursed to the applicable
Master Servicer or the Trustee from such Servicing Group and that was deemed to
have been reimbursed out of principal collections that would otherwise
constitute part of the Principal Distribution Amount, in each case, with
interest on such Advance, during the period since the preceding Distribution
Date.

            "Principal Distribution Amount": As to any Distribution Date (other
than the final Distribution Date), an amount equal to the total, without
duplication, of the following: (i) all payments of principal, including
voluntary Principal Prepayments and the principal portion of any Cure Payments,
received by or on behalf of the Trust with respect to the Loans (but not in
respect of any Junior Loan) during the related Due Period, exclusive of any
portion of those payments that represents a late collection of principal for
which an Advance was previously made for a prior Distribution Date or that
represents the principal portion of a Monthly Payment due on or before the Due
Date for the related Loan in September 2006 or on a due date for the related
Loan subsequent to the end of the related Due Period, (ii) the principal portion
of all Monthly Payments received by or on behalf of the Trust with respect to
the Loans (but not in respect of any Companion Loan or Junior Loan) prior to,
but that are due during, the related Due Period, (iii) all other collections,
including Liquidation Proceeds and Insurance and Condemnation Proceeds, that
were received by or on behalf of the Trust Fund with respect to any of the Loans
(but not in respect of any Companion Loan or Junior Loan) or any related REO
Properties during the related Due Period and that were identified and applied by
the applicable Master Servicer as recoveries of principal of the subject Loan
(but not in respect of any Companion Loan or Junior Loan) or, in the case of an
REO Property, of the related REO Loan (but not an REO Loan in respect of a
predecessor Junior Loan), in each case net of any portion of the particular
collection that represents a late collection of principal for which an Advance
of principal was previously made for a prior Distribution Date or that
represents the principal portion of a Monthly Payment due on or before the Due
Date for the related Loan in September 2006, (iv) all Advances of principal made
with respect to the Mortgage Pool for that Distribution Date, provided that if
any Insurance and Condemnation Proceeds or Liquidation Proceeds were received
and/or a Final Recovery Determination was made with respect to any Loan or REO
Property during the related Due Period, then that portion, if any, of the
aggregate amount described in clause (i) through (iv) above that is specifically
attributable to such Loan or REO Property, shall be reduced to not less than
zero by any Special Servicing Fees or Liquidation Fees previously paid hereunder
with respect to such Loan or REO Property from collections on the Mortgage Pool
other than Penalty Charges collected during the Due Period. For the final
Distribution Date, an amount equal to the total Stated Principal Balance of the
Mortgage Pool outstanding immediately prior to that final Distribution Date.

            Notwithstanding the foregoing, (i) the Principal Distribution Amount
for any Distribution Date for any Loan Group will be reduced by the Principal
Distribution Adjustment Amount for such Loan Group for such Distribution Date;
and (ii) the Principal Distribution Amount for any Loan Group will be increased
by the amount of any recovery occurring during the related Due Period of an
amount that was previously advanced with respect to a Loan, but only if and to
the extent such Advance was previously reimbursed from principal collections
that would otherwise have constituted part of the Principal Distribution Amount
for such Loan Group for a prior Distribution Date in a manner that resulted in a
Principal Distribution Adjustment Amount for such Loan Group for such prior
Distribution Date.

            "Principal Prepayment": Any payment of principal made by the
Borrower on a Loan that is received in advance of its scheduled Due Date and
which is not accompanied by an amount of interest representing scheduled
interest due on any date or dates in any month or months subsequent to the month
of prepayment, other than any amount paid in connection with the release of the
related Mortgaged Property through defeasance.

            "Privileged Person": Each holder of a Certificate, each of the
parties to this Agreement, each of the Rating Agencies, each of the
Underwriters, each Junior Loan Holder, each Companion Loan Holder, any
Certificate Owner or prospective purchaser of a Certificate upon receipt from
such Certificate Owner or prospective purchaser of an investor certification
(which may be in electronic form), the form of which is attached hereto as
Exhibit S, and any other Person designated by the Depositor. The Certificate
Administrator shall (and a Master Servicer may) provide all Privileged Persons
with access to certain restricted information on its Website (in the case of any
Certificate Owner or prospective purchaser, upon receipt of such investor
certification) through the use of a restricted mechanism on its Website.

             "Prohibited Party": Any party that (i) is listed on the Depositor's
Do Not Hire List or (ii) is a proposed Servicing Function Participant for which
the applicable Master Servicer, Special Servicer or Trustee that seeks to retain
such Servicing Function Participant has actual knowledge that such party at any
point prior to such hiring, assignment or transfer failed to comply in all
material respects with the Servicing Function Participant's obligations under
Regulation AB with respect to any other securitization.

            "Projected Debt Service Coverage Ratio": With respect to any Co-op
Loan, as of any date of determination, the Projected Net Cash Flow for the
related Mortgaged Property on an annualized basis, divided by the annualized
Monthly Payments for such Co-op Loan.

            "Projected Net Cash Flow": With respect to any Mortgaged Property
that is a residential cooperative property, projected net operating income at
such Mortgaged Property, as set forth in the Appraisal obtained with respect to
such Mortgaged Property in connection with the origination of the related Co-op
Loan (or an updated Appraisal, if required hereunder), assuming such Mortgaged
Property was operated as a rental property with rents set at prevailing market
rates taking into account the presence of existing rent controlled or rent
stabilized occupants, reduced by underwritten capital expenditures, property
operating expenses, a market-rate vacancy assumption and projected reserves.

            "Prospectus": The Prospectus dated September 8, 2006, as
supplemented by the Prospectus Supplement.

            "Prospectus Supplement": The Prospectus Supplement dated September
21, 2006, relating to the offering of the Public Certificates.

            "PTCE": A prohibited transaction class exemption, as issued by the
United States Department of Labor.

            "PTE": A prohibited transaction exemption, as issued by the United
States Department of Labor.

            "Purchase Price": With respect to any Loan to be purchased (a) by or
on behalf of a Responsible Party pursuant to or as contemplated by Section 7 of
the related Mortgage Loan Purchase Agreement, (b) by the Directing
Certificateholder pursuant to Section 3.18(b), a Special Servicer pursuant to
Section 3.18(c), or an assignee of either thereof, in any case, pending
determination of Fair Value, (c) with respect to any Loan Combination, if the
related Intercreditor Agreement so provides for a purchase option, by any Junior
Loan Holder or Companion Loan Holder, or (d) by the holders of more than 50% of
the Percentage Interests in the Controlling Class, a Special Servicer or a
Master Servicer pursuant to Section 9.01, a price equal to the sum of the
following:

            (i) the outstanding principal balance of such Loan as of the date of
      purchase (and, if the Loan that is being purchased is part of a Loan
      Combination and the related Companion Loan Holder or Junior Loan Holder
      has previously made a Cure Payment, the outstanding principal balance as
      reduced by the principal portion of such Cure Payment);

            (ii) all accrued and unpaid interest on such Loan at the related
      Mortgage Rate in effect from time to time to but not including the Due
      Date in the Due Period of purchase (which includes unpaid Master Servicing
      Fees and Primary Servicing Fees) and all related Special Servicing Fees;

            (iii) all related unreimbursed Servicing Advances (and any related
      Servicing Advances reimbursed by the Trust Fund out of general collections
      on the Mortgage Pool) plus accrued and unpaid interest on related Advances
      at the Reimbursement Rate;

            (iv) if such Loan is being repurchased by or on behalf of a
      Responsible Party pursuant to or as contemplated by Section 7 of the
      related Mortgage Loan Purchase Agreement following the expiration of the
      applicable cure period (as it may be extended), the amount of the
      Liquidation Fee payable to the Special Servicer;

            (v) if such Loan is being purchased by a Junior Loan Holder or
      Companion Loan Holder pursuant to the related Intercreditor Agreement
      following 60 days from the related Loan becoming a Specially Serviced
      Loan, the amount of the Liquidation Fee payable to the Special Servicer,
      provided that no liquidation fee will be payable to any special servicer
      in connection with the purchase of the 3434 North Washington Boulevard
      Loan by the Junior Holder in accordance with the related Intercreditor
      Agreement; and

            (vi) if such Loan is being purchased by or on behalf of a
      Responsible Party pursuant to or as contemplated by Section 7 of the
      related Mortgage Loan Purchase Agreement, all reasonable out-of-pocket
       expenses reasonably incurred (whether paid or then owing) by the
      applicable Master Servicer, the applicable Special Servicer, the Depositor
      and the Trustee in respect of the Breach, Defect or defeasance giving rise
      to the repurchase obligation, including any expenses arising out of the
      enforcement of the repurchase obligation and, without duplication of any
      amounts described above in this definition, any Trust Fund expenses
      incurred prior to such purchase date with respect to such Loan and/or (if
      applicable) its related Companion Loan or Junior Loan.

            With respect to any Defaulted Loan to be purchased by the Directing
Certificateholder (or any assignee thereof) or a Special Servicer pursuant to
Section 3.18(b) or 3.18(c) following determination of Fair Value, the Purchase
Price will equal the Fair Value of such Defaulted Loan. With respect to any REO
Property to be sold pursuant to Section 3.18(e), the amount calculated in
accordance with the second preceding sentence of this definition in respect of
the related REO Loan(s).

            With respect to the Ritz Carlton Mortgage Loan, the Purchase Price
for each applicable Mortgage Loan Seller will be its respective percentage
interest of the total Purchase Price for the Ritz Carlton Mortgage Loan. The
percentage interest with respect to the Ritz Carlton Mortgage Loan shall be 50%
for BCRE and 50% for Column.

            "Qualified Appraiser": In connection with the appraisal of any
Mortgaged Property or REO Property, an Independent MAI-designated appraiser with
at least five years of experience in respect of the relevant geographic location
and property type.

            "Qualified Institutional Buyer" or "QIB": A "qualified institutional
buyer" within the meaning of Rule 144A under the Securities Act.

            "Qualified Insurer": (i) With respect to any Loan, Companion Loan,
Junior Loan, REO Loan or REO Property, an insurance company or security or
bonding company qualified to write the related Insurance Policy in the relevant
jurisdiction and a minimum claims paying ability rating of at least "A-" by
Fitch (if then rated by Fitch), "A-" by S&P and "A3" by Moody's, (ii) with
respect to the fidelity bond and errors and omissions Insurance Policy required
to be maintained pursuant to Section 3.07(c), an insurance company that has a
claims paying ability rated no lower than two ratings below the rating assigned
to then highest rated outstanding Certificate, but in no event lower than "A-3"
by Moody's (if then rated by Moody's), "A-" by Fitch (if then rated by Fitch)
and "A-" by S&P or, in the case of clauses (i) and (ii), such other rating as
each such Rating Agency shall have confirmed in writing will not cause such
Rating Agency to downgrade, qualify or withdraw any then-current rating assigned
to any of the Certificates that are then- currently being rated by such Rating
Agency (or insofar as there is then outstanding any class of Companion Loan
Securities that is then rated by such Rating Agency, such class of securities).

            "Qualified Substitute Mortgage Loan": A mortgage loan which must, on
the date of substitution: (i) have an outstanding principal balance, after
application of all scheduled payments of principal and interest due during or
prior to the month of substitution, not in excess of the Stated Principal
Balance of the deleted Loan as of the Due Date in the calendar month during
which the substitution occurs; (ii) have a Mortgage Rate not less than the
Mortgage Rate of the deleted Loan; (iii) have the same Due Date as the deleted
Loan; (iv) accrue interest on the same basis as the deleted Loan (for example,
on the basis of a 360-day year and the actual number of days elapsed); (v) have
a remaining term to stated maturity not greater than, and not more than two
years less than, the remaining term to stated maturity of the deleted Loan; (vi)
have an original Loan-to-Value Ratio not higher than that of the deleted Loan
and a current Loan-to-Value Ratio not higher than the then current Loan-to-Value
Ratio of the deleted Loan; (vii) materially comply as of the date of
substitution with all of the representations and warranties set forth in the
applicable Mortgage Loan Purchase Agreement; (viii) have an Environmental
Assessment that indicates no material adverse environmental conditions with
respect to the related Mortgaged Property and which will be delivered as a part
of the related Mortgage File; (ix) have an original Debt Service Coverage Ratio
of not less than the original Debt Service Coverage Ratio of the deleted Loan
and a current Debt Service Coverage Ratio of not less than the current Debt
Service Coverage Ratio of the deleted Loan (provided that, with respect to Co-op
Loans and any related replacement Loans, such Debt Service Coverage Ratios shall
mean Projected Debt Service Coverage Ratio); (x) be determined by an Opinion of
Counsel (at the applicable Responsible Party's expense) to be a "qualified
replacement mortgage" within the meaning of Section 860G(a)(4) of the Code; (xi)
not have a maturity date after the date two years prior to the Rated Final
Distribution Date; (xii) not be substituted for a deleted Loan unless the
Trustee has received prior confirmation in writing by each Rating Agency that
such substitution will not result in the withdrawal, downgrade, or qualification
of the rating assigned by the Rating Agency to any Class of Certificates then
rated by the Rating Agency (the cost, if any, of obtaining such confirmation to
be paid by the applicable Responsible Party); (xiii) have been approved by the
Directing Certificateholder in its sole discretion; (xiv) prohibit defeasance
within two years after the Closing Date; (xv) not be substituted for a deleted
Loan if it would result in the termination of the REMIC status of any Trust
REMIC established under this Agreement or the imposition of tax on any such
Trust REMIC other than a tax on income expressly permitted or contemplated to be
received by the terms of this Agreement, as determined by an Opinion of Counsel
and (xvi) be secured by a residential cooperative property if it is replacing a
Co-op Loan. In the event that one or more mortgage loans are substituted for one
or more deleted Loans, then the amounts described in clause (i) shall be
determined on the basis of aggregate principal balances and the rates described
in clause (ii) above (provided that no Net Mortgage Rate shall be less than the
Pass-Through Rate of any Class of Sequential Pay Certificates then outstanding)
and the remaining term to stated maturity referred to in clause (v) above shall
be determined on a weighted average basis. When a Qualified Substitute Mortgage
Loan is substituted for a deleted Loan, the applicable Responsible Party shall
certify that such mortgage loan meets all of the requirements of the above
definition and shall send such certification to the Trustee. Any Qualified
Substitute Mortgage Loan substituted for the 828-850 Madison Avenue Loan shall
be an asset solely of the 828-850 Madison Avenue Loan REMIC.

            "Rated Final Distribution Date": As to each Class of Sequential Pay
Certificates, other than the Class S Certificates, the Distribution Date
occurring in September 2039.

            "Rating Agency": Each of Moody's, S&P and Fitch, or their successors
in interest. If any of such rating agencies or any successor thereto ceases to
remain in existence, "Rating Agency" shall be deemed to refer to any other
NRSRO, or other comparable Person, designated by the Depositor to replace the
rating agency that has ceased to exist. Notice of such designation shall be
given to the Trustee and the Master Servicer, and the specific ratings of
Moody's, Fitch and S&P herein referenced shall be deemed to refer to the
equivalent ratings of the party so designated; provided, however, that if such
designated party has not then assigned a rating to a depository institution,
insurer or any other Person or item, then any failure to satisfy a requirement
under this Agreement to meet or maintain such equivalent rating shall not be
deemed an Event of Default or breach of the Servicing Standard solely as a
result of such failure.

            "Record Date": With respect to any Distribution Date, the last
Business Day of the month immediately preceding the month in which such
Distribution Date occurs.

             "Reference Rate": With respect to any Distribution Date from and
including the October 2006 Distribution Date to and including the September 2013
Distribution Date, the corresponding rate per annum set forth on Exhibit N
hereto.

            "Registered Certificate": Any Certificate that has been subject to
registration under the Securities Act. As of the Closing Date, the Class A-1,
Class A-1-A, Class A-2, Class A-AB, Class A-3, Class A-4FL, Class A-M and Class
A-J Certificates constitute Registered Certificates.

            "Registrar Office": As defined in Section 5.02(a).

            "Regular Certificate": Any Sequential Pay Certificate or
Interest-Only Certificate.

            "Regulation AB": Subpart 229.1100 - Asset Backed Securities
(Regulation AB), 17 C.F.R. ss.ss. 229.1100-229.1123, as such may be amended from
time to time, and subject to such clarification and interpretation as have been
provided by the Commission in the adopting release (Asset-Backed Securities,
Securities Act Release No. 33-8518, 70 Fed. Reg. 1,506, 1,531 (Jan. 7, 2005)) or
by the staff of the Commission, or as may be provided by the Commission or its
staff from time to time.

            "Regulation AB Companion Loan Securitization": As defined in Section
11.15.

             "Regulation S": Regulation S under the Securities Act.

            "Regulation S Global Certificate": With respect to any Class of
Book-Entry Non-Registered Certificates offered and sold outside of the United
States in reliance on Regulation S, a single global Certificate, or multiple
global Certificates collectively, in definitive, fully registered form without
interest coupon, each of which Certificates bears a Regulation S Legend.

            "Regulation S Legend": With respect to any Class of Book-Entry
Non-Registered Certificates offered and sold outside the United States in
reliance on Regulation S, a legend generally to the effect that such
Certificates may not be offered, sold, pledged or otherwise transferred in the
United States or to a United States Securities Person prior to the Release Date
except pursuant to an exemption from the registration requirements of the
Securities Act.

            "Reimbursement Rate": The rate per annum applicable to the accrual
of interest on Servicing Advances in accordance with Section 3.03(d) and P&I
Advances in accordance with Section 4.03(d), which rate per annum shall equal
the "Prime Rate" published in the "Money Rates" Section of The Wall Street
Journal (or, if such Section or publication is no longer available, such other
comparable publication as is determined by the Trustee in its sole discretion)
as may be in effect from time to time, or, if the "Prime Rate" no longer exists,
such other comparable rate (as determined by the Trustee in its reasonable
discretion) as may be in effect from time to time.

            "Release Date": With respect to any Class of Non-Registered
Certificates (other than the Class R and Class V Certificates), the date that is
40 days following the later of (i) the commencement of the offering of such
Non-Registered Certificates to Persons other than distributors in reliance upon
Regulation S under the Securities Act and (ii) the date of closing of such
offering.

            "Relevant Servicing Criteria": The Servicing Criteria applicable to
each Reporting Servicer (as set forth, with respect to each Master Servicer,
each Special Servicer and the Trustee, on Exhibit U attached hereto). For
clarification purposes, multiple Reporting Servicers can have responsibility for
the same Relevant Servicing Criteria and some of the Servicing Criteria will not
be applicable to certain Reporting Servicers. With respect to a Servicing
Function Participant engaged by the Trustee, a Master Servicer or a Special
Servicer, the term "Relevant Servicing Criteria" refers to the items of the
Relevant Servicing Criteria applicable to the Trustee, the Master Servicer or
the Special Servicer that engaged such Servicing Function Participant that are
applicable to such Servicing Function Participant based on the functions it has
been engaged to perform.

            "Remaining Principal Distribution Amount": As to any Distribution
Date and any Class of Sequential Pay Certificates (exclusive of the Class A
Sequential Pay Certificates), the amount, if any, by which the Principal
Distribution Amount for such Distribution Date exceeds the aggregate amount
distributed in respect of principal on such Distribution Date to all Classes of
Sequential Pay Certificates (including the Class A Sequential Pay Certificates)
senior to the subject Class.

            "REMIC": A "real estate mortgage investment conduit" as defined in
Section 860D of the Code (or any successor thereto).

            "REMIC Declaration": The declaration establishing the 828-850
Madison Avenue Loan REMIC described in the Preliminary Statement.

            "REMIC Provisions": Provisions of the federal income tax law
relating to real estate mortgage investment conduits, which appear at Sections
860A through 860G of Subchapter M of Chapter 1 of Subtitle A of the Code, and
related provisions, and temporary and final regulations and, to the extent not
inconsistent with such temporary and final regulations, proposed regulations,
and published rulings, notices and announcements promulgated thereunder, as the
foregoing may be in effect from time to time.

            "Rents from Real Property": With respect to any REO Property, gross
income of the character described in Section 856(d) of the Code.

            "REO Account": A segregated custodial account or accounts created
and maintained by a Special Servicer pursuant to Section 3.16 on behalf of the
Trustee in trust for the Certificateholders and any related Junior Loan
Holder(s) or Companion Loan Holders, which shall be entitled "[name of Special
Servicer], as Special Servicer, in trust for [name of Trustee], as Trustee, for
Holders of Credit Suisse First Boston Mortgage Securities Corp. Commercial
Mortgage Pass-Through Certificates and any related Junior Loan Holder(s) or
Companion Loan Holder, as their interests may appear, Series 2006-C4, REO
Account." Any such account or accounts shall be an Eligible Account.

            "REO Acquisition": With respect to any Loan, the acquisition by the
Trust Fund of REO Property related to such Loan.

            "REO Acquisition Date": With respect to any REO Property, the first
day on which such REO Property is acquired by the Trust Fund and the Lower-Tier
REMIC, or with respect to the 828-850 Madison Avenue Loan, the 828-850 Madison
Avenue Loan REMIC, respectively, within the meaning of Treasury Regulations
Section 1.856-6(b)(1), which is the first day on which the Lower-Tier REMIC or
the 828-850 Madison Avenue Loan REMIC, as applicable, is treated as the owner of
such REO Property (or any interest therein) for federal income tax purposes.

            "REO Disposition": The sale or other disposition of the REO Property
pursuant to Section 3.18(e).

            "REO Extension": As defined in Section 3.16(a).

            "REO Loan": Any Loan, Companion Loan or Junior Loan deemed to be
outstanding with respect to each REO Property. Each REO Loan shall be deemed to
be outstanding for so long as the related REO Property remains part of the Trust
Fund, and shall be deemed to provide for Assumed Scheduled Payments on each Due
Date therefor and otherwise have the same terms and conditions as its
predecessor Loan, Companion Loan or Junior Loan, as the case may be, including,
without limitation, with respect to the calculation of the Mortgage Rate in
effect from time to time (such terms and conditions to be applied without regard
to the default on such predecessor Loan, Companion Loan or Junior Loan, as the
case may be). Each REO Loan shall be deemed to have an initial outstanding
principal balance and, if applicable, Stated Principal Balance equal to the
outstanding principal balance and, if applicable, Stated Principal Balance,
respectively, of its predecessor Loan, Companion Loan or Junior Loan, as
applicable, as of the related REO Acquisition Date. All amounts due and owing in
respect of the predecessor Loan or Junior Loan, as applicable, as of the related
REO Acquisition Date, including, without limitation, accrued and unpaid
interest, shall continue to be due and owing in respect of an REO Loan. All
amounts payable or reimbursable to any Master Servicer, any Special Servicer or
the Trustee, as applicable, in respect of the predecessor Loan, Companion Loan
or Junior Loan as of the related REO Acquisition Date, including, without
limitation, any unpaid Special Servicing Fees and Master Servicing Fees and any
unreimbursed Advances, together with any interest accrued and payable to the
applicable Master Servicer or the Trustee in respect of such Advances in
accordance with Section 3.03(d) or Section 4.03(d), shall continue to be payable
or reimbursable to the relevant party hereunder in respect of an REO Loan. In
addition, Workout-Delayed Reimbursement Amounts and Nonrecoverable Advances with
respect to an REO Loan (including interest accrued thereon), in each case, that
were paid from general collections on the Mortgage Pool and resulted in
principal distributed to the Certificateholders being reduced shall be deemed
outstanding until recovered. Collections in respect of each REO Loan (exclusive
of amounts to be applied to the payment of, or to be reimbursed to a Master
Servicer or Special Servicer for the payment of, the costs of operating,
managing and maintaining the related REO Property) shall be treated: first, as a
recovery of accrued and unpaid Advances, Nonrecoverable Advances and
Workout-Delayed Reimbursement Amounts with respect to such REO Loan (in the case
of Nonrecoverable Advances and Workout-Delayed Reimbursement Amounts, that were
paid from general collections of principal on the Mortgage Pool and resulted in
principal distributed to the Certificateholders being reduced), Primary
Servicing Fees and Master Servicing Fees and related interest due the applicable
Master Servicer or the Trustee; second, as a recovery of any remaining accrued
and unpaid interest on such REO Loan at the related Net Mortgage Rate to but not
including the Due Date in the Due Period of receipt; third, as a recovery of
principal of such REO Loan to the extent of its entire unpaid principal balance;
and fourth, in accordance with the Servicing Standard of the Master Servicer, as
a recovery of any other amounts due and owing in respect of such REO Loan,
including, without limitation, prepayment consideration and Penalty Charges,
provided that if the 280 Park Avenue Total Loan and its related Companion Loan
become REO Loans, the treatment of the foregoing amounts with respect to the 280
Park Avenue Total Loan and its related Companion Loan, shall be subject to the
terms of the applicable Intercreditor Agreement and this Agreement.

            "REO Property": A Mortgaged Property acquired on behalf and in the
name of the Trustee for the benefit of the Certificateholders (or, in the case
of a Mortgaged Property securing the 828-850 Madison Avenue Total Loan, the 3434
North Washington Boulevard Total Loan, the 500 Sansome Office Total Loan, the
280 Park Avenue Total Loan or any CBA A/B Loan Pair, for the benefit of the
Certificateholders, the Companion Loan Holder(s) and the Junior Loan Holder(s),
as their interests may appear), through foreclosure, acceptance of a
deed-in-lieu of foreclosure or otherwise in accordance with applicable law in
connection with the default or imminent default of a Loan or a Loan Combination.

            "REO Revenues": All income, rents and profits derived from the
ownership, operation or leasing of any REO Property.

            "Reportable Event": As defined in Section 11.09.

            "Reporting Servicer": The Master Servicers, the Special Servicers,
the Trustee and any Servicing Function Participant, as the case may be.

            "Repurchased Note": As defined in Section 3.34.

            "Repurchasing Seller": As defined in Section 3.34.

            "Request for Release": A release signed by a Servicing Officer of a
Master Servicer or a Special Servicer, as applicable, in the form of Exhibit D
attached hereto.

            "Requesting Subordinate Certificateholder": The Holder of any of the
Class L, Class M, Class N, Class O, Class P, Class Q or Class S Certificates,
that delivers notice to the Trustee, the Master Servicers and the Special
Servicers indicating that such Holder is a "Requesting Subordinate
Certificateholder."

            "Responsible Officer": (i) Any officer of the Global Securities and
Trust Services group of the Certificate Administrator (and, in the event that
the Certificate Administrator is the Certificate Registrar or the Paying Agent,
of the Certificate Registrar or the Paying Agent, as applicable) and (ii) when
used with respect to the initial Trustee, any Vice President, Assistant Vice
President or trust officer of the Trustee having direct responsibility for the
administration of this Agreement, and with respect to any successor Trustee, any
officer or assistant officer in the corporate trust department of the Trustee or
any other officer of the Trustee customarily performing functions similar to
those performed by any of the above designated officers to whom a particular
matter is referred by the Trustee because of such officer's knowledge of and
familiarity with the particular subject.

             "Responsible Party": As to the specified Loans, the indicated party:
(a) in the case of the CSMC Loans, the CSMC Mortgage Loan Seller; (b) in the
case of the LaSalle Loans, the LaSalle Mortgage Loan Seller; (c) in the case of
the KeyBank Loans, the KeyBank Mortgage Loan Seller; (d) in the case of the BCRE
Loan, the BCRE Mortgage Loan Seller; and (e) in the case of the NCB, FSB Loans,
the NCB, FSB Mortgage Loan Seller; provided that, insofar as the obligations of
the CSMC Mortgage Loan Seller under Section 7 of the CSMC Mortgage Loan Purchase
Agreement are guaranteed by the Column Performance Guarantor, then the term
"Responsible Party" shall, as to the CSMC Loans, mean the CSMC Mortgage Loan
Seller and the Column Performance Guarantor, individually and collectively, as
the context may require.

            "Restricted Master Servicer Reports": Collectively, to the extent
not filed with the Commission, the CMSA Comparative Financial Status Report, the
CMSA Servicer Watch List, the CMSA Operating Statement Analysis Report, the CMSA
Financial File, the Asset Status Report and CMSA NOI Adjustment Worksheet.

            "Revised Rate": With respect to the ARD Loans, the increased
interest rate after the Anticipated Repayment Date (in the absence of a default)
for each applicable ARD Loan, as calculated and as set forth in the related ARD
Loan.

            "Ritz Carlton Mortgage Loan": The Loan identified as Loan No. 4 on
the Mortgage Loan Schedule.

            "Rule 144A Global Certificate": With respect to any Class of
Book-Entry Non-Registered Certificates, a single global Certificate, or multiple
global Certificates collectively, registered in the name of the Depository or
its nominee, in definitive, fully registered form without interest coupons, each
of which Certificates bears a Qualified Institutional Buyer CUSIP number and
does not bear a Regulation S Legend.

            "S&P": Standard & Poor's Ratings Services, a division of The
McGraw-Hill Companies, Inc., and its successors in interest. If neither such
rating agency nor any successor remains in existence, "S&P" shall be deemed to
refer to such other nationally recognized statistical rating agency or other
comparable Person designated by the Depositor, notice of which designation shall
be given to the other parties hereto, and specific ratings of Standard & Poor's
Ratings Services, a division of The McGraw-Hill Companies, Inc. herein
referenced shall be deemed to refer to the equivalent ratings of the party so
designated; provided, however, that if such designated party has not then
assigned a rating to a depository institution, insurer or any other Person or
item, then any failure to satisfy a requirement under this Agreement to meet or
maintain such equivalent rating shall not be deemed an Event of Default or
breach of the Servicing Standard solely as a result of such failure. References
herein to "applicable rating category" (other than such references to "highest
applicable rating category") shall, in the case of S&P, be deemed to refer to
such applicable rating category of S&P, without regard to any plus or minus or
other comparable rating qualification.

            "Sarbanes-Oxley Act": The Sarbanes-Oxley Act of 2002 and the rules
and regulations of the Commission promulgated thereunder (including any
interpretations thereof by the Commission's staff).

            "Sarbanes-Oxley Certification": As defined in Section 11.08.

            "Securities Act": The Securities Act of 1933, as amended and the
rules and regulations thereunder.

             "Security Agreement": With respect to any Loan or Junior Loan, any
security agreement or equivalent instrument, whether contained in the related
Mortgage or executed separately, creating in favor of the holder of such
Mortgage a security interest in the personal property constituting security for
repayment of such Loan or Junior Loan, as the case may be.

            "Security Position Listing": A listing prepared by the Depository of
the holdings of Depository Participants with respect to the Certificates.

            "Senior Principal Distribution Cross-Over Date": The first
Distribution Date as of which the aggregate of the Class Principal Balances of
the Class A-1, Class A-2, Class A-AB, Class A-3 and Class A-1-A Certificates and
the Class A-4FL Regular Interest outstanding immediately prior thereto equals or
exceeds the sum of (a) the aggregate Stated Principal Balance of the Mortgage
Pool that will be outstanding immediately following such Distribution Date, plus
(b) the lesser of (i) the Principal Distribution Amount for such Distribution
Date and (ii) the portion of the Available Distribution Amount for such
Distribution Date that will remain after all distributions of interest to be
made on the Class A-X, Class A-SP, Class A-Y, Class A-1, Class A-2, Class A-AB,
Class A-3 and Class A-1-A Certificates and the Class A-4FL Regular Interest on
such Distribution Date pursuant to Section 4.01(a) have been so made.

            "Sequential Pay Certificates": Any of the Class A-1, Class A-1-A,
Class A-2, Class A-AB, Class A-3, Class A-4FL, Class A-M, Class A-J, Class B,
Class C, Class D, Class E, Class F, Class G, Class H, Class J, Class K, Class L,
Class M, Class N, Class O, Class P, Class Q or Class S Certificates.

            "Serviced Loan Combinations": The 3434 North Washington Boulevard
Total Loan, the 828-850 Madison Avenue Total Loan, the 500 Sansome Office Total
Loan, the 280 Park Avenue Total Loan and, with respect to each CBA A/B Loan
Pair, upon a "Material Default" under the related CBA A/B Intercreditor
Agreement, such CBA A/B Loan Pair, collectively.

            "Servicer": As defined in Section 11.03.

            "Service(s)(ing)": In accordance with Regulation AB, the act of
servicing and administering the Loans or any other assets of the Trust by an
entity that meets the definition of "servicer' set forth in Item 1101 of
Regulation AB and is subject to the disclosure requirements set forth in 1108 of
Regulation AB. For clarification purposes, any uncapitalized occurrence of this
term shall have the meaning commonly understood by participants in the
commercial mortgage-backed securitization market.

            "Servicing Account": The account or accounts created and maintained
pursuant to Section 3.03.

            "Servicing Advances": All customary, reasonable and necessary
"out-of-pocket" costs and expenses, including attorneys' fees and expenses and
fees of real estate brokers, paid or to be paid, as the context requires, out of
its own funds, by a Master Servicer or Special Servicer (or, if applicable, the
Trustee) in connection with the servicing of a Loan and/or (if applicable) the
related Companion Loan and Junior Loan(s), after a default, delinquency or other
unanticipated event has occurred or is reasonably foreseeable, or in connection
with the administration of any REO Property, including (1) any such costs and
expenses associated with (a) compliance with the obligations of a Master
Servicer and/or Special Servicer set forth in Sections 2.03, 3.03(c) and 3.09,
(b) the preservation, insurance, restoration, protection and management of a
Mortgaged Property, including the cost of any "force placed" insurance policy
purchased by a Master Servicer or Special Servicer to the extent such cost is
allocable to a particular Mortgaged Property that such Master Servicer or
Special Servicer is required to cause to be insured pursuant to Section 3.07,
(c) obtaining any Insurance and Condemnation Proceeds or Liquidation Proceeds in
respect of any such Loan, Companion Loan, Junior Loan or any REO Property, (d)
any enforcement or judicial proceedings with respect to any such Loan and/or (if
applicable) the related Companion Loan or Junior Loan(s), including foreclosures
and similar proceedings, (e) the operation, leasing, management, maintenance and
liquidation of any REO Property, (f) obtaining any Appraisal or environmental
report required to be obtained hereunder, and (g) UCC filings (to the extent
that the costs thereof are not reimbursed by the related Borrower), (2) the
reasonable and direct out-of-pocket travel expenses incurred by a Special
Servicer in connection with performing inspections pursuant to Section 3.19, and
(3) any other expenditure which is expressly designated as a Servicing Advance
herein.

            "Servicing Criteria": The criteria set forth in paragraph (d) of
Item 1122 of Regulation AB as such may be amended from time to time.

            "Servicing Fee": With respect to any Loan, 3434 North Washington
Boulevard Junior Loan, 500 Sansome Office Junior Loan or 828-850 Madison Avenue
Junior Loan (and any successor REO Loan with respect to any of the foregoing),
any related Master Servicing Fee and related Primary Servicing Fee, together.

            "Servicing Fee Rate": With respect to any Loan, 3434 North
Washington Boulevard Junior Loan, 500 Sansome Office Junior Loan or 828-850
Madison Avenue Junior Loan (and any successor REO Loan with respect to any of
the foregoing), the sum of any related Master Servicing Fee Rate and any related
Primary Servicing Fee Rate.

             "Servicing File": Any documents, certificates, opinions and reports
(other than documents required to be part of the related Mortgage File)
delivered by the related Borrower in connection with or relating to the
origination and servicing of any Loan, Companion Loan or Junior Loan or which
are reasonably required for the ongoing administration of such Loan, Companion
Loan or Junior Loan, as the case may be, including appraisals, surveys,
engineering reports, environmental reports, financial statements, leases, rent
rolls and tenant estoppels, but excluding any other documents and writings that
have been prepared by the related Mortgage Loan Seller or any of its Affiliates
solely for internal credit analysis or other internal uses or any
attorney-client privileged communication, together with copies of documents
required to be part of the related Mortgage File.

            With respect to the Ritz Carlton Mortgage Loan, the delivery of the
Servicing File by either BCRE or Column shall satisfy the delivery requirements
for both BCRE and Column.

            "Servicing Function Participant": Any Person, other than the Master
Servicers, the Special Servicers and the Trustee, that is, within the meaning of
Item 1122 of Regulation AB, performing activities that address the Servicing
Criteria, unless such Person's activities relate only to 5% or less of the Loans
(calculated by Stated Principal Balance).

            "Servicing Group": Servicing Group A or Servicing Group B, as
applicable.

            "Servicing Group A": Collectively, all of the Loans that are Group A
Loans and any successor REO Loans with respect thereto.

            "Servicing Group B": Collectively, all of the Loans that are Group B
Loans and any successor REO Loans with respect thereto.

             "Servicing Officer": Any officer and/or employee of a Master
Servicer or Special Servicer involved in, or responsible for, the administration
and servicing of Loans (and if applicable, the related Junior Loans and
Companion Loan), whose name and specimen signature appear on a list of servicing
officers furnished by such Master Servicer or Special Servicer, as the case may
be, to the Trustee, the Certificate Administrator and the Depositor on the
Closing Date as such list may be amended from time to time thereafter.

            "Servicing Standard": As defined in Section 3.01(a).

            "Servicing Transfer Event": With respect to any Loan, Companion Loan
or Junior Loan, as applicable, the occurrence of any of the following events:

             (i) a payment default shall have occurred on such Loan, Companion
      Loan or Junior Loan, as the case may be, at its Maturity Date (except, if
      (a) the Borrower is making its Assumed Scheduled Payment, (b) the Borrower
      notifies the Master Servicer of its intent to refinance such Loan,
      Companion Loan or Junior Loan, as the case may be, and is diligently
      pursuing such refinancing, (c) the Borrower delivers a firm commitment to
      refinance acceptable to the applicable Special Servicer, with the consent
      of the Directing Certificateholder within 45 days after the Maturity Date,
      and (d) such refinancing occurs within 60 days of such default, which
      60-day period may be extended to 120 days at the applicable Special
       Servicer's discretion, with the consent of the Directing
      Certificateholder); provided, that in the case of clause (c) and clause
      (d) the applicable Special Servicer will not follow any such direction, or
      refrain from acting based upon the lack of any such direction, of the
      Directing Certificateholder, if following any such direction of the
      Directing Certificateholder or refraining from taking such action based
      upon the lack of any such direction of the Directing Certificateholder
      would violate the Servicing Standard; or

            (ii) any Monthly Payment (other than a Balloon Payment) or monthly
      debt service payment is 60 days or more delinquent; or

            (iii) the applicable Master Servicer or, with the approval of the
      Directing Certificateholder, the applicable Special Servicer determines
      that a payment default or a material non-monetary default has occurred or
      is imminent and is not likely to be cured within 60 days; or

             (iv) a decree or order of a court or agency or supervisory authority
      having jurisdiction in the premises in an involuntary case under any
      present or future federal or state bankruptcy, insolvency or similar law
      or the appointment of a conservator or receiver or liquidator in any
      insolvency, readjustment of debt, marshaling of assets and liabilities or
      similar proceedings, or for the winding-up or liquidation of its affairs
      is entered against the related Borrower; provided that if such decree or
      order is discharged or stayed within 60 days of being entered, such Loan,
      Companion Loan or Junior Loan, as the case may be, shall not be a
      Specially Serviced Loan (and no Special Servicing Fees, Workout Fees or
      Liquidation Fees will be payable with respect thereto); or

            (v) the related Borrower shall file for or consent to the
      appointment of a conservator or receiver or liquidator in any insolvency,
      readjustment of debt, marshaling of assets and liabilities or similar
      proceedings of or relating to such Borrower or of or relating to all or
      substantially all of its property; or

            (vi) the related Borrower shall admit in writing its inability to
      pay its debts generally as they become due, file a petition to take
      advantage of any applicable insolvency or reorganization statute, make an
      assignment for the benefit of its creditors, or voluntarily suspend
      payment of its obligations; or

             (vii) the applicable Master Servicer has received notice of the
      foreclosure or proposed foreclosure of any lien on the related Mortgaged
      Property; or

            (viii) with respect to any Loan that is a part of any Loan
      Combination where the related Junior Loan Holder has exercised its right
      to cure consecutive monetary defaults up to the amount of consecutive
      monetary defaults permitted pursuant to the related Intercreditor
      Agreement, the occurrence of a monetary default in the following month; or

            (ix) any other default has occurred which, in the reasonable
      judgment of the applicable Special Servicer (with the approval of the
      Directing Certificateholder) or the applicable Master Servicer, has
      materially and adversely affected the value of such Loan, Companion Loan
      or Junior Loan, as the case may be, or otherwise materially and adversely
      affects the interests of the Certificateholders and, in either such case,
      has continued unremedied for 30 days (irrespective of any applicable grace
      period specified in the related Loan Documents), provided that the failure
      of the related Borrower to obtain all-risk casualty insurance that does
      not contain any carve-out for terrorist or similar act (other than such
      amounts as are specifically required by the related Loan Agreement) shall
      not apply with respect to this clause if the applicable Special Servicer
      has determined in accordance with the Servicing Standard that either (a)
      such insurance is not available at commercially reasonable rates and that
      such hazards are not at the time commonly insured against for properties
      similar to the Mortgaged Property and located in or around the region in
      which such Mortgaged Property is located or (b) such insurance is not
      available at any rate.

            Notwithstanding the foregoing, if a default occurs under any Loan
Combination, which the related Junior Loan Holder has the option to cure
pursuant to the related Intercreditor Agreement, then a Servicing Transfer Event
will not be deemed to have occurred with respect to such Loan Combination and
such Loan Combination will not be considered a Specially Serviced Loan unless
and until the related Junior Loan Holder or Companion Loan Holder does not
exercise its option to cure prior to the expiration of the applicable cure
period as described in such related Intercreditor Agreement.

            "Significant Loan": At any time, (a) any Loan (i) whose principal
balance is $20,000,000 or more at such time or (ii) that is (x) a Loan, (y) part
of a group of Crossed Loans or (z) part of a group of Loans made to affiliated
Borrowers that, in each case, in the aggregate, represents 5% or more of the
aggregate outstanding principal balance of the Mortgage Pool at such time or (b)
any one of the ten largest Loans (which for the purposes of this definition
shall include groups of Crossed Loans and groups of Loans made to affiliated
Borrowers), by outstanding principal balance at such time.

            "Similar Law": Any federal, state or local law materially similar to
Section 406 or 407 of ERISA or Section 4975 of the Code.

            "Single-Purpose Entity" or "SPE": A person, other than an
individual, whose organizational documents provide (with such exceptions as may
be approved by the applicable Master Servicer or Special Servicer in their
respective discretion, in each case in accordance with the Servicing Standard)
that it is formed solely for the purpose of owning and pledging Defeasance
Collateral relating to one or more Defeasance Loans; shall not engage in any
business unrelated to such Defeasance Collateral; shall not have any assets
other than those related to its interest in the Defeasance Collateral and may
not incur any indebtedness other than as required to assume the defeased
obligations under the related Note or Notes that have been defeased; shall
maintain its own books, records and accounts, in each case which are separate
and apart from the books, records and accounts of any other Person; shall hold
regular meetings, as appropriate, to conduct its business, and shall observe all
entity level formalities and recordkeeping; shall conduct business in its own
name and use separate stationery, invoices and checks; may not guarantee or
assume the debts or obligations of any other Person; shall not commingle its
assets or funds with those of any other Person; shall pay its obligations and
expenses and the salaries of its own employees from its own funds and allocate
and charge reasonably and fairly any common employees or overhead shared with
Affiliates; shall prepare separate tax returns and financial statements or, if
part of a consolidated group, shall be shown as a separate member of such group;
shall transact business with Affiliates on an arm's-length basis pursuant to
written agreements; shall hold itself out as being a legal entity, separate and
apart from any other Person; if such entity is a limited partnership, shall have
as its only general partners, general partners which are Single-Purpose Entities
which are corporations; if such entity is a corporation, at all relevant times,
has and will have at least one Independent Director; the board of directors of
such entity shall not take any action requiring the unanimous affirmative vote
of 100% of the members of the board of directors unless all of the directors,
including without limitation all Independent Directors, shall have participated
in such vote; shall not fail to correct any known misunderstanding regarding the
separate identity of such entity; if such entity is a limited liability company,
shall have at least one member that is a Single-Purpose Entity which is a
corporation, and such corporation shall be the managing member of such limited
liability company; shall hold its assets in its own name; except for the pledge
of such Defeasance Collateral, shall not pledge its assets for the benefit of
any other person or entity; shall not make loans or advances to any person or
entity; shall not identify its partners, members or shareholders, or any
affiliates of any of them as a division or part of it; if such entity is a
limited liability company, such entity shall dissolve only upon the bankruptcy
of the managing member, and such entity's articles of organization, certificate
of formation and/or operating agreement, as applicable, shall contain such
provision; if such entity is a limited liability company or limited partnership,
and such entity has one or more managing members or general partners, as
applicable, then such entity shall continue (and not dissolve) for so long as a
solvent managing member or general partner, as applicable, exists and such
entity's organizational documents shall contain such provision. The SPE's
organizational documents shall further prohibit any dissolution and winding up
and provide that any insolvency filing for such entity requires the unanimous
consent of all partners, directors (including without limitation all Independent
Directors) or members, as applicable, and that such documents may not without
Rating Agency confirmation of Certificate ratings, in respect of any Significant
Loan, be amended with respect to the Single-Purpose Entity requirements so long
as any Certificates are outstanding.

            "Sole Certificateholder": Any Holder (or Holders provided they act
in unanimity) holding 100% of then outstanding Class A-X, Class A-SP, Class A-Y,
Class L, Class M, Class N, Class O, Class P, Class Q and Class S Certificates or
an assignment of the voting rights thereof; provided, however, that the Class
Principal Balances of the Class A-1, Class A-1-A, Class A-2, Class A-AB, Class
A-3, Class A-4FL, Class A-M, Class A-J, Class B, Class C, Class D, Class E,
Class F, Class G, Class H, Class J and Class K Certificates have been reduced to
zero.

            "Special Servicer": With respect to (a) all of the Group A Loans,
any related Companion Loan or Junior Loans and any related REO Properties, and
any matters relating to the foregoing, Special Servicer No. 1, and (b) all of
the Group B Loans and any related REO Properties, and any matters relating to
the foregoing, Special Servicer No. 2.

            "Special Servicer No. 1": LNR Partners Inc., in its capacity as
special servicer with respect to the Group A Loans, any related Companion Loan
or Junior Loans and any related REO Properties hereunder, or any successor
special servicer appointed as provided herein with respect to the Group A Loans,
any related Junior Loans and any related REO Properties.

            "Special Servicer No. 2": National Consumer Cooperative Bank, in its
capacity as special servicer with respect to the Group B Loans and any related
REO Properties hereunder, or any successor special servicer appointed as
provided herein with respect to the Group B Loans and any related REO
Properties.

            "Special Servicing Fee": With respect to each Specially Serviced
Loan and REO Loan, the fee payable to the applicable Special Servicer pursuant
to the first paragraph of Section 3.11(b), computed on the basis of the Stated
Principal Balance of the related Loan and for the same period for which any
related interest payment on the related Specially Serviced Loan is computed, as
more particularly described in Section 3.11(b).

             "Special Servicing Fee Rat