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POOLING AND SERVICING AGREEMENT

Pooling and Servicing Agreement

POOLING AND SERVICING AGREEMENT | Document Parties: DEUTSCHE BANK NATIONAL TRUST COMPANY | INDYMAC BANK | INDYMAC MBS, INC You are currently viewing:
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DEUTSCHE BANK NATIONAL TRUST COMPANY | INDYMAC BANK | INDYMAC MBS, INC

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Title: POOLING AND SERVICING AGREEMENT
Governing Law: Delaware     Date: 12/13/2006

POOLING AND SERVICING AGREEMENT, Parties: deutsche bank national trust company , indymac bank , indymac mbs  inc
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                                  EXHIBIT 99.1
                                  ------------

                       The Pooling and Servicing Agreement
<PAGE>


===============================================================================





                                 INDYMAC MBS, INC.
                                    Depositor


                              INDYMAC BANK, F.S.B.
                               Seller and Servicer


                      DEUTSCHE BANK NATIONAL TRUST COMPANY
                     Trustee and Supplemental Interest Trustee


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

                         POOLING AND SERVICING AGREEMENT
                          Dated as of November 1, 2006
                    ----------------------------------------


                     RESIDENTIAL ASSET SECURITIZATION TRUST
                                 Series 2006-A15


                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  Series 2006-O







===============================================================================





<PAGE>

                                TABLE OF CONTENTS
<TABLE>
<CAPTION>

<S>                                                                                                              <C>
                                                                                                               Page
                                                                                                                ----

ARTICLE ONE DEFINITIONS...........................................................................................7

         Section 1.01       Definitions............................................................................7
         Section 1.02       Rules of Construction.................................................................39

ARTICLE TWO CONVEYANCE OF MORTGAGE LOANS; REPRESENTATIONS AND WARRANTIES.........................................41

         Section 2.01       Conveyance of Mortgage Loans..........................................................41
         Section 2.02       Acceptance by the Trustee of the Mortgage Loans.......................................44
         Section 2.03       Representations, Warranties, and Covenants of the Seller and the Servicer.............46
         Section 2.04       Representations and Warranties of the Depositor as to the Mortgage Loans..............48
         Section 2.05       Delivery of Opinion of Counsel in Connection with Substitutions.......................48
         Section 2.06       Execution and Delivery of Certificates................................................49
         Section 2.07       REMIC Matters.........................................................................49

ARTICLE THREE ADMINISTRATION AND SERVICING OF MORTGAGE LOANS.....................................................50

         Section 3.01       Servicer to Service Mortgage Loans....................................................50
         Section 3.02       [Reserved]............................................................................51
         Section 3.03       Rights of the Depositor and the Trustee in Respect of the Servicer....................51
         Section 3.04       [Reserved]............................................................................51
         Section 3.05       Trustee to Act as Servicer............................................................51
         Section 3.06       Collection of Mortgage Loan Payments; Servicing Accounts; Collection Account;
                           Certificate Account; Distribution Account; Supplemental Interest Trust;
                           Supplemental Interest Reserve Fund....................................................51
         Section 3.07       Collection of Taxes, Assessments and Similar Items; Escrow Accounts...................54
         Section 3.08       Access to Certain Documentation and Information Regarding the Mortgage Loans..........55
         Section 3.09        Permitted Withdrawals from the Certificate Account, the Distribution Account
                           and the Supplemental Interest Reserve Fund............................................55
         Section 3.10       Maintenance of Hazard Insurance; Maintenance of Primary Insurance Policies............57
         Section 3.11       Enforcement of Due-On-Sale Clauses; Assumption Agreements.............................58
         Section 3.12       Realization Upon Defaulted Mortgage Loans.............................................59
         Section 3.13       Trustee to Cooperate; Release of Mortgage Files.......................................61
         Section 3.14       Documents, Records and Funds in Possession of the Servicer to be Held for the
                            Trustee...............................................................................62
         Section 3.15       Servicing Compensation................................................................62
         Section 3.16        Access to Certain Documentation.......................................................62
         Section 3.17       Annual Statement as to Compliance.....................................................63
         Section 3.18       Errors and Omissions Insurance; Fidelity Bonds........................................63
         Section 3.19       The Supplemental Interest Trust.......................................................63
         Section 3.20       Prepayment Charges....................................................................64


                                                            i
<PAGE>

ARTICLE FOUR DISTRIBUTIONS AND ADVANCES BY THE SERVICER..........................................................65

         Section 4.01        Advances..............................................................................65
         Section 4.02       Priorities of Distribution............................................................66
         Section 4.03       [Reserved]............................................................................71
         Section 4.04       [Reserved]............................................................................71
         Section 4.05       Allocation of Realized Losses.........................................................71
         Section 4.06       Monthly Statements to Certificateholders..............................................73
         Section 4.07       [Reserved]............................................................................76
         Section 4.08       Distributions from the Supplemental Interest Reserve Fund.............................76
         Section 4.09       Determination of Pass-Through Rates for LIBOR Certificates............................76

ARTICLE FIVE THE CERTIFICATES....................................................................................78

         Section 5.01       The Certificates......................................................................78
         Section 5.02       Certificate Register; Registration of Transfer and Exchange of Certificates...........78
         Section 5.03       Mutilated, Destroyed, Lost or Stolen Certificates.....................................82
         Section 5.04       Persons Deemed Owners.................................................................83
         Section 5.05       Access to List of Certificateholders' Names and Addresses.............................83
         Section 5.06       Maintenance of Office or Agency.......................................................83

ARTICLE SIX THE DEPOSITOR AND THE SERVICER.......................................................................84

         Section 6.01       Respective Liabilities of the Depositor and the Servicer..............................84
         Section 6.02       Merger or Consolidation of the Depositor or the Servicer..............................84
         Section 6.03       Limitation on Liability of the Depositor, the Seller, the Servicer, and Others........84
          Section 6.04       Limitation on Resignation of the Servicer.............................................85

ARTICLE SEVEN DEFAULT............................................................................................86

         Section 7.01       Events of Default.....................................................................86
         Section 7.02       Trustee to Act; Appointment of Successor..............................................87
         Section 7.03       Notification to Certificateholders....................................................89

ARTICLE EIGHT CONCERNING THE TRUSTEE.............................................................................90

         Section 8.01       Duties of the Trustee.................................................................90
         Section 8.02       Certain Matters Affecting the Trustee.................................................90
         Section 8.03       Trustee Not Liable for Certificates or Mortgage Loans.................................92
         Section 8.04       Trustee May Own Certificates..........................................................92
         Section 8.05       Trustee's Fees and Expenses...........................................................92
          Section 8.06       Eligibility Requirements for the Trustee..............................................93
         Section 8.07       Resignation and Removal of the Trustee................................................93
         Section 8.08       Successor Trustee.....................................................................94
         Section 8.09       Merger or Consolidation of the Trustee................................................95
         Section 8.10       Appointment of Co-Trustee or Separate Trustee.........................................95
         Section 8.11       Tax Matters...........................................................................96

ARTICLE NINE TERMINATION.........................................................................................99


                                                           ii
<PAGE>

         Section 9.01       Termination upon Liquidation or Purchase of the Mortgage Loans........................99
         Section 9.02       Final Distribution on the Certificates................................................99
         Section 9.03       Additional Termination Requirements..................................................101

ARTICLE TEN MISCELLANEOUS PROVISIONS............................................................................102

         Section 10.01      Amendment............................................................................102
         Section 10.02      Recordation of Agreement; Counterparts...............................................103
         Section 10.03      Governing Law........................................................................104
         Section 10.04      Intention of Parties.................................................................104
         Section 10.05      Notices. 104
         Section 10.06      Severability of Provisions...........................................................105
         Section 10.07      Assignment...........................................................................105
         Section 10.08      Limitation on Rights of Certificateholders...........................................105
         Section 10.09      Inspection and Audit Rights..........................................................106
         Section 10.10      Certificates Nonassessable and Fully Paid............................................106
         Section 10.11      Official Record......................................................................106
         Section 10.12      Protection of Assets.................................................................107
         Section 10.13      Qualifying Special Purpose Entity....................................................107

ARTICLE ELEVEN EXCHANGE ACT REPORTING...........................................................................108

         Section 11.01      Filing Obligations...................................................................108
         Section 11.02      Form 10-D Filings....................................................................108
         Section 11.03      Form 8-K Filings.....................................................................109
         Section 11.04      Form 10-K Filings....................................................................109
         Section 11.05      Sarbanes-Oxley Certification.........................................................110
         Section 11.06      Form 15 Filing.......................................................................110
         Section 11.07      Report on Assessment of Compliance and Attestation...................................110
         Section 11.08      Use of Subcontractors................................................................112
         Section 11.09      Amendments...........................................................................112


                                                           iii
<PAGE>

                                    SCHEDULES
Schedule I:           Mortgage Loan Schedule...................................................................S-I-1

Schedule II:          Representations and Warranties of the Seller/Servicer...................................S-II-1

Schedule III:         Representations and Warranties as to the Mortgage Loans................................S-III-1

Schedule IV:          Principal Balance Schedule..............................................................S-IV-1

Schedule V:           Form of Monthly Report...................................................................S-V-1


                                    EXHIBITS

Exhibit A:            Form of Senior Certificate (other than the Notional Amount Certificates)...................A-1

Exhibit B:            Form of Subordinated Certificate...........................................................B-1

Exhibit C:            Form of Class A-R Certificate..............................................................C-1

Exhibit D:            Form of Notional Amount Certificate........................................................D-1

Exhibit E:            Form of Reverse of Certificates............................................................E-1

Exhibit F:            Form of Class P Certificates...............................................................F-1

Exhibit G-1:          Form of Initial Certification of Trustee ................................................G-1-1

Exhibit G-2:          Form of Delay Delivery Certification.....................................................G-2-1

Exhibit H:            Form of Final Certification of Trustee.....................................................H-1

Exhibit I:            Form of Transfer Affidavit.................................................................I-1

Exhibit J:            Form of Transferor Certificate.............................................................J-1

Exhibit K:            Form of Investment Letter (Non-Rule 144A)..................................................K-1

Exhibit L:            Form of Rule 144A Letter...................................................................L-1

Exhibit M:            Form of Request for Release (for Trustee)..................................................M-1

Exhibit N:            Request for Release of Documents...........................................................N-1

Exhibit O:            [Reserved].................................................................................O-1

Exhibit P:            Form of Class A-10 Corridor Contract.......................................................P-1

Exhibit Q             [Reserved].................................................................................Q-1


                                                           iv
<PAGE>

Exhibit R:            Form of Performance Certification (Trustee)................................................R-1

Exhibit S:            Compliance Statement.............................................................            S-1

Exhibit T:            List of 1119 Parties.............................................................            T-1

Exhibit U:            Form of Sarbanes-Oxley Certification (Replacement of Servicer)...................            U-1
</TABLE>


                                                            v
<PAGE>

          THIS POOLING AND SERVICING AGREEMENT, dated as of November 1, 2006,
among INDYMAC MBS, INC., a Delaware corporation, as depositor (the "Depositor"),
IndyMac Bank, F.S.B. ("IndyMac"), a federal savings bank, as seller (in that
capacity, the "Seller") and as Servicer (in that capacity, the "Servicer"), and
Deutsche Bank National Trust Company, a national banking association, as trustee
(the "Trustee"),

                           W I T N E S S E T H   T H A T

         In consideration of the mutual agreements set forth in this Agreement,
the parties agree as follows:

                     P R E L I M I N A R Y   S T A T E M E N T

         The Depositor is the owner of the Trust Fund that is hereby conveyed to
the Trustee in return for the Certificates. The Trust Fund for federal income
tax purposes will consist of two REMICs (the "Lower Tier REMIC" and the "Master
REMIC"). Each Certificate, other than the Class A-R Certificate, will represent
ownership of one or more regular interests in the Master REMIC for purposes of
the REMIC Provisions. The Class A-R Certificate represents ownership of the sole
class of residual interest in each REMIC created hereunder. The Master REMIC
will hold as assets the Lower Tier REMIC Regular Interests. The Lower Tier REMIC
will hold as assets all property of the Trust Fund other than the interests in
the Lower Tier REMIC. For federal income tax purposes, each Certificate (other
than the Class A-R Certificate) is hereby designated as a regular interest in
the Master REMIC and each Lower Tier REMIC Regular Interest, as defined below,
is designated as a regular interest in the Lower Tier REMIC. The latest possible
maturity date of all REMIC regular interests created in this Agreement shall be
the Latest Possible Maturity Date. All amounts in respect of waived Prepayment
Charges paid by the Servicer to the Class P Certificates pursuant to the second
paragraph of Section 3.20 will be treated as paid directly by the Servicer to
the Class P Certificates and not as paid by or through any REMIC created
hereunder.

         The Supplemental Interest Trust, the Supplemental Interest Reserve Fund
and the Corridor Contract shall not constitute any part of any REMIC described
in this Agreement.

                                Lower Tier REMIC

         The following table sets forth characteristics of the Lower Tier REMIC
Regular Interests:

<TABLE>
<CAPTION>

   ============================ ==================== ================== ========================= =====================
    Lower Tier REMIC Regular                                                  Allocation of            Allocation of
            Interest              Principal Balance    Pass-Through Rate           Interest                Principal
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
<S>                              <C>                   <C>                 <C>                        <C>    
              LT-A-1                     (1)               6.25%                   Class A-1                Class A-1
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-2                     (1)               6.25%                  Class A-2                 Class A-2
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-3                     (1)               6.25%                  Class A-3                Class A-3
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-4                     (1)               6.00%             Class A-4, Class A-6          Class A-6
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-5                     (1)               6.25%                  Class A-5                Class A-5
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-7                     (1)               6.25%                  Class A-7                Class A-7
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-8                     (1)               6.25%                  Class A-8                Class A-8
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-9                     (1)               6.25%                  Class A-9                Class A-9
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
               LT-A-10                    (1)               6.25%               Class A-10, A-11            Class A-10
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-12                     (1)               6.25%                  Class A-12               Class A-12
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-13                    (1)                6.25%                  Class A-13               Class A-13
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-14                    (1)               6.25%                   Class A-14               Class A-14
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-15                    (1)               6.25%                  Class A-15               Class A-15
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------


                                                            1
<PAGE>


   ============================ ==================== ================== ========================= =====================
    Lower Tier REMIC Regular                                                  Allocation of            Allocation of
            Interest              Principal Balance    Pass-Through Rate           Interest                Principal
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-16                    (1)               6.25%                  Class A-16               Class A-16
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-17                    (1)               6.25%                  Class A-17               Class A-17
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
               LT-PO                     (1)               0.00%                     N/A                    Class PO
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-A-X                     (1)                (2)                   Class A-X                   N/A
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-$100                    (1)               6.25%                  Class A-R                Class A-R
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-B-1                     (1)               6.25%                   Class B-1                Class B-1
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-B-2                     (1)               6.25%                   Class B-2                Class B-2
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-B-3                     (1)               6.25%                   Class B-3                Class B-3
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
               LT-B-4                     (1)               6.25%                   Class B-4                Class B-4
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-B-5                      (1)               6.25%                   Class B-5                Class B-5
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-B-6                     (1)                6.25%                   Class B-6                Class B-6
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
               LT-P                      (1)               N/A(3)                     N/A                    Class P
   ---------------------------- -------------------- ------------------ ------------------------- ---------------------
              LT-R(4)                    N/A                N/A                      N/A                       N/A
   ============================ ==================== ================== ========================= =====================
</TABLE>

(1)       For each Distribution Date, following the allocation of scheduled
         principal, Principal Prepayments and Realized Losses, the principal
         balance for each such Lower Tier REMIC Regular Interest will be the
         principal balance in respect of the corresponding Class of Certificates
         (or the sum of the principal balances if there is more than one
         corresponding Class) set forth under the Column titled "Allocation of
         Principal". The notional principal balance of the Class LT-A-X Interest
         will be the principal balance of the Non-Discount Mortgage Loans.

(2)        For federal income tax purposes, Pass-Through Rate of the Class LT-A-X
         Interest for any Distribution Date will be equal to the excess of the
         weighted average of the Adjusted Net Mortgage Rates of the Non-Discount
         Mortgage Loans over the Required Coupon.

(3)       The LT-P Interest will not be entitled to any interest, but will be
         entitled to 100% of any Prepayment Charges paid on the Mortgage Loans.

(4)       The Class LT-R Interest is the sole class of residual interest in the
         Lower Tier REMIC and will not be entitled to distributions of principal
         or interest.

                                The Master REMIC

         The following table sets forth characteristics of the Certificates,
together with the minimum denominations and integral multiples in excess thereof
in which such Classes shall be issuable (except that one Certificate of each
Class of Certificates may be issued in a different amount):

<TABLE>
<CAPTION>


   ============================ ========================= ==================== ==================== ===================
                                                                                                         Integral
                                      Initial Class             Pass-Through             Minimum            Multiples in
        Class Designation           Certificate Balance             Rate               Denomination       Excess of Minimum
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
<S>                              <C>                        <C>                   <C>                   <C>    
             Class A-1                   $50,000,000.00          6.25%              $       25,000                   $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class A-2                   $29,160,000.00          6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class A-3                    $4,772,000.00          6.25%              $        1,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class A-4                     Notional (1)          6.00%              $       25,000(2)               $1(2)
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class A-5                   $18,250,000.00          6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class A-6                   $77,275,000.00          6.00%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class A-7                    $1,146,000.00          6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------



                                                            2
<PAGE>

<CAPTION>

   ============================ ========================= ==================== ==================== ===================
                                                                                                          Integral
                                      Initial Class            Pass-Through             Minimum            Multiples in
        Class Designation           Certificate Balance             Rate                Denomination       Excess of Minimum
<S>                              <C>                        <C>                   <C>                   <C>    
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class A-8                    $1,790,000.00          6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
              Class A-9                  $124,000,000.00          6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
            Class A-10                    $99,083,000.00       Floating (4)          $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
            Class A-11                     Notional (6)       Floating (5)          $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
            Class A-12                    $7,012,000.00          6.25%               $        1,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
            Class A-13                   $18,221,000.00          6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
            Class A-14                    $1,500,000.00          6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
            Class A-15                    $9,208,000.00          6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
            Class A-16                    $7,732,000.00          6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
            Class A-17                    $1,050,000.00          6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class PO                     $1,036,388.43         N/A (3)             $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class A-X                     Notional (7)          6.25%              $       25,000 (2)              $1(2)
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class A-R                         $100.00           6.25%              $          100             N/A
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class B-1                  $10,293,000.00           6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class B-2                    $5,745,000.00           6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class B-3                   $3,351,000.00            6.25%              $       25,000                  $1
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class B-4                   $3,591,000.00           6.25%               $      100,000              $1,000
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class B-5                   $2,633,000.00           6.25%              $      100,000               $1,000
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
             Class B-6                   $1,917,070.10           6.25%              $      100,000              $1,000
   ---------------------------- ------------------------- -------------------- -------------------- -------------------
              Class P                           $100.00          N/A(8)             $          100                 N/A
   ============================ ========================= ==================== ==================== ===================
</TABLE>

(1)       The Class A-4 Certificates will be Notional Amount Certificates, will
         have no Class Certificate Balance and will bear interest on its
          Notional Amount, which will be $3,219,791, for the initial Interest
         Accrual Period.

(2)       Denomination is based on Notional Amount.

(3)       The Class PO Certificates are Principal Only Certificates and are not
         entitled to receive distributions of interest.

(4)       The Class A-10 Certificates will bear interest during each Interest
         Accrual Period at a per annum rate equal to the lesser of (i) LIBOR
         plus 0.60% and (ii) 6.25%. The Pass-Through Rate for the Class A-10
         Certificates during the initial Interest Accrual Period is 5.92% per
         annum.

(5)       The Class A-11 Certificates will bear interest during each Interest
         Accrual Period at a per annum rate equal to 5.65% minus LIBOR, subject
         to a maximum of 5.65% and a minimum of 0%. The Pass Through Rate for
         the Class A-11 Certificates during the initial Interest Accrual Period
         is 0.33% per annum.

(6)       The Class A-11 Certificates will be Notional Amount Certificates, will
         have no Class Certificate Balance and will bear interest on its
         Notional Amount, which will be $423,772,426, for the initial Interest
         Accrual Period.

(7)       The Class A-X Certificates will be Notional Amount Certificates, will
         have no Class Certificate Balance and will bear interest on its
         Notional Amount, which will be $44,612,289.32 for the initial Interest
         Accrual Period. For federal income tax purposes, the Class A-X
         Certificates will be entitled to 100% of the LT-A-X Interest cash flow.


                                        3
<PAGE>

(8)       The Class P Certificate will not be entitled to any interest, but will
         be entitled to 100% of any Prepayment Charges paid on the Mortgage
         Loans. For federal income tax purposes, the Class P Certificate will be
         entitled to 100% of the Class LT-P Regular Interest cash flow.

         The foregoing REMIC structure is intended to cause all of the cash from
the Mortgage Loans to flow through to the Master REMIC as cash flow on a REMIC
regular interest, without creating any shortfall--actual or potential (other
than for credit losses) to any REMIC regular interest.

         Scheduled Principal Prepayments and Realized Losses will be allocated
to the Lower Tier REMIC Regular Interests in the same manner as such amounts are
allocated to the Master REMIC Classes referenced under the column titled
"Allocation of Principal."

Set forth below are designations of Classes of Certificates to the categories
used herein:
<TABLE>
<CAPTION>
<S>                                                            <C>    

Accretion Directed Certificates..........................      Class A-9 Certificates

Accrual Certificates.....................................      Class A-14 Certificates

Book-Entry Certificates..................................      All Classes of Certificates other than the Physical
                                                              Certificates.

COFI Certificates........................................      None.

Component Certificates...................................      Class PO Certificates.

Components...............................................      Group 1A PO Component and Group 1B PO Component.

Delay Certificates.......................................      All interest-bearing Classes of Certificates other
                                                              than any Non-Delay Certificates.

ERISA-Restricted Certificates............................      The Residual Certificates and the Private
                                                              Certificates; the Retained Certificates until they
                                                              have been the subject of an ERISA-Qualifying
                                                              Underwriting; and Certificates of any Class that
                                                              ceases to have a rating of BBB- (or its equivalent)
                                                               or better from at least one Rating Agency.

Group 1A Certificates....................................      Class A-R, Class A-1, Class A-2, Class A-3, Class
                                                               A-4, Class A-5, Class A-6, Class A-7 and Class A-8
                                                              Certificates, Group 1A PO Component and Group 1A
                                                              Subordinated Portion.

Group 1B Certificates....................................      Class A-9, Class A-10, Class A-11, Class A-12, Class
                                                              A-13, Class A-14, Class A-15, Class A-16 and Class
                                                               A-17 Certificates, Group 1B PO Component and Group
                                                              1B Subordinated Portion.


                                                            4
<PAGE>

LIBOR Certificates.......................................      Class A-10 and Class A-11 Certificates

Non-Delay Certificates...................................      LIBOR Certificates.

Notional Amount Certificates.............................      Class A-4, Class A-11 and Class A-X Certificates

Offered Certificates.....................................      All Classes of Certificates other than the Private
                                                              Certificates.

Physical Certificates....................................      Class A-R Certificates and the Private Certificates.

Planned Principal Classes................................      None.

Principal Only Certificates..............................      Class PO Certificates.

Private Certificates.....................................      Class P, Class B-4, Class B-5 and Class B-6
                                                              Certificates.

Rating Agencies..........................................      Fitch, S&P and Moody's.

Regular Certificates.....................................      All Classes of Certificates other than the Class A-R
                                                              Certificates.

Residual Certificate.....................................      Class A-R Certificates.

Retained Certificates....................................      Class A-X and Class PO Certificates.

Senior Certificates......................................      Class A-1, Class A-2, Class A-3, Class A-4, Class
                                                               A-5, Class A-6, Class A-7, Class A-8, Class A-9,
                                                              Class A-10, Class A-11, Class A-12, Class A-13,
                                                               Class A-14, Class A-15, Class A-16, Class A-17,
                                                              Class A-X, Class PO and Class A-R Certificates

Subordinated Certificates................................      Class B-1, Class B-2, Class B-3, Class B-4, Class
                                                              B-5 and Class B-6 Certificates.

Subordinated Portions....................................      Group 1A Subordinated Portion and Group 1B
                                                               Subordinated Portion.

Targeted Principal Classes...............................      None.

Targeted Principal Component.............................      None.
</TABLE>


         With respect to any of the foregoing designations as to which the
corresponding reference is "None," all defined terms and provisions in this
Agreement relating solely to such designations shall be of no force or effect,
and any calculations in this Agreement incorporating references to such
designations shall be interpreted without reference to such designations and
amounts. Defined terms and provisions in


                                       5
<PAGE>


this Agreement relating to statistical rating agencies not designated above as
Rating Agencies shall be of no force or effect.








                                        6
<PAGE>

                                   ARTICLE ONE

                                   DEFINITIONS

Section 1.01       Definitions.

         Unless the context requires a different meaning, capitalized terms are
used in this Agreement as defined below.

         Accretion Directed Certificates:   As specified in the Preliminary
Statement.

         Accretion Direction Rule: With respect to the Class A-14 Certificates
and any Distribution Date up to and including the Accrual Termination Date, the
Accrual Amount shall be distributed as principal, sequentially, (i) to the Class
A-9 Certificates, until its Class Certificate Balance is reduced to zero and
(ii) to the Class A-14 Certificates.

         Accrual Amount: With respect to the Class A-14 Certificates and any
Distribution Date up to and including the Accrual Termination Date, the amount
allocable to interest on the Class A-14 Certificates with respect to such
Distribution Date pursuant to Section 4.02(a)(1)(i).

         Accrual Certificates:   As specified in the Preliminary Statement.

         Accrual Termination Date: With respect to the Class A-14 Certificates,
the earlier of (a) the Senior Credit Support Depletion Date and (b) the
Distribution Date on which the Class Certificate Balance of the Class A-9
Certificates has been reduced to zero.

         Additional Designated Information:   As defined in Section 11.02.

         Adjusted Mortgage Rate:   As to each Mortgage Loan and at any time, the
per annum rate equal to the Mortgage Rate less the Servicing Fee Rate.

         Adjusted Net Mortgage Rate: As to each Mortgage Loan and any
Distribution Date, the per annum rate equal to the Mortgage Rate of that
Mortgage Loan (as of the Due Date in the month preceding the month in which such
Distribution Date occurs) less the Expense Fee Rate for that Mortgage Loan.

         Adjustment Date:   Not applicable.

         Advance: The payment required to be made by the Servicer with respect
to any Distribution Date pursuant to Section 4.01, the amount of any such
payment being equal to the aggregate of payments of principal and interest (net
of the Servicing Fee) on the Mortgage Loans that were due during the related Due
Period and not received as of the close of business on the related Determination
Date, together with an amount equivalent to interest on each REO Property, net
of any net income from such REO Property, less the aggregate amount of any such
delinquent payments that the Servicer has determined would constitute a
Nonrecoverable Advance if advanced.

         Advance Notice: As defined in Section 4.01(b).

         Advance Deficiency: As defined in Section 4.01(b).

         Affiliate: With respect to any Person, any other Person controlling,
controlled or under common control with such Person. For purposes of this
definition, "control" means the power to direct the



                                       7
<PAGE>

management and policies of a Person, directly or indirectly, whether through
ownership of voting securities, by contract, or otherwise and "controlling" and
"controlled" shall have meanings correlative to the foregoing. Affiliates also
include any entities consolidated with the requirements of generally accepted
accounting principles.

         Aggregate Planned   Balance: Not applicable.

         Aggregate Targeted Balance: Not applicable.

         Agreement:   This Pooling and Servicing Agreement and all amendments and
  supplements.

         Allocable Share: As to any Distribution Date and any Mortgage Loan (i)
[reserved]; (ii) with respect to the Class PO Certificates, zero and (iii) with
respect to each other Class of Certificates the product of (a) the lesser of (I)
the ratio that the Required Coupon bears to such Adjusted Net Mortgage Rate of
such Mortgage Loan and (II) one, multiplied by (b) the ratio that the amount
calculated with respect to such Distribution Date for such Class, pursuant to
clause (i) of the definition of Class Optimal Interest Distribution Amount
(without giving effect to any reduction of such amount pursuant to Section
4.02(d)) bears to the aggregate amount calculated with respect to such
Distribution Date for each such Class of Certificates pursuant to clause (i) of
the definition of Class Optimal Interest Distribution Amount (without giving
effect to any reduction of such amounts pursuant to Section 4.02(d)).

         Allocation Percentage:   The Group 1A Allocation Percentage or the Group
  1B Allocation Percentage, as
applicable.

          Amount Available for Senior Principal: As to any Distribution Date, the
Available Funds for such Distribution Date, reduced by the aggregate amount
distributable (or allocable to the Accrual Amount, if applicable) on such
Distribution Date in respect of interest on the Senior Certificates pursuant to
Section 4.02(a)(1)(iii).

         Amount Held for Future Distribution: As to any Distribution Date, the
aggregate amount held in the Certificate Account at the close of business on the
related Determination Date on account of (i) Principal Prepayments received
after the last day of the related Prepayment Period and Liquidation Proceeds and
Subsequent Recoveries received in the month of such Distribution Date and (ii)
all Scheduled Payments due after the related Due Date.

         Applicable Credit Support Percentage:   As defined in Section 4.02(e).

         Appraised Value: With respect to any Mortgage Loan, the Appraised Value
of the related Mortgaged Property shall be: (i) with respect to a Mortgage Loan
other than a Refinance Loan, the lesser of (a) the value of the Mortgaged
Property based upon the appraisal made at the time of the origination of such
Mortgage Loan and (b) the sales price of the Mortgaged Property at the time of
the origination of such Mortgage Loan; and (ii) with respect to a Refinance
Loan, the value of the Mortgaged Property based upon the appraisal made at the
time of the origination of such Refinance Loan.

         Available Funds: As to any Distribution, the sum of (a) the aggregate
amount held in the Certificate Account at the close of business on the related
Determination Date, including any Subsequent Recoveries, net of the Amount Held
for Future Distribution, net of Prepayment Charges and net of amounts permitted
to be withdrawn from the Certificate Account pursuant to clauses (i) - (viii),
inclusive, of Section 3.09(a) and amounts permitted to be withdrawn from the
Distribution Account pursuant to clauses (i) - (ii), inclusive, of Section
3.09(b), (b) the amount of the Advances for that Distribution Date, (c) in
connection with Defective Mortgage Loans, the aggregate of the Purchase Prices
and Substitution



                                       8
<PAGE>

Adjustment Amounts deposited on the related Distribution Account Deposit Date,
and (d) any amount deposited on the related Distribution Account Deposit Date
pursuant to Section 3.10. The Holders of the Class P Certificates will be
entitled to all Prepayment Charges received on the Mortgage Loans and such
amounts will not be available for distribution to the Holders of any other Class
of Certificates.

         Bankruptcy Code:   The United States Bankruptcy Reform Act of 1978, as
amended.

         Bankruptcy Coverage Termination Date:   The point in time at which the
Bankruptcy Loss Coverage Amount is
reduced to zero.

         Bankruptcy Loss: With respect to any Mortgage Loan, a Deficient
Valuation or Debt Service Reduction; provided, however, that a Bankruptcy Loss
shall not be deemed a Bankruptcy Loss under this Agreement so long as the
Servicer has notified the Trustee in writing that the Servicer is diligently
pursuing any remedies that may exist in connection with the related Mortgage
Loan and either (A) the related Mortgage Loan is not in default with regard to
payments due under the Mortgage Loan or (B) delinquent payments of principal and
interest under the related Mortgage Loan and any related escrow payments in
respect of such Mortgage Loan are being advanced on a current basis by the
Servicer, in either case without giving effect to any Debt Service Reduction or
Deficient Valuation.

         Bankruptcy Loss Coverage Amount: As of any date of determination, the
Bankruptcy Loss Coverage Amount shall equal the Initial Bankruptcy Loss Coverage
Amount as reduced by (i) the aggregate amount of Bankruptcy Losses allocated to
the Certificates since the Cut-off Date and (ii) any permissible reductions in
the Bankruptcy Loss Coverage Amount as evidenced by a letter of each Rating
Agency to the Trustee to the effect that any such reduction will not result in a
downgrading, qualification or withdrawal of the then current ratings assigned to
the Classes of Certificates rated by it.

         Blanket Mortgage:   The mortgage or mortgages encumbering a Cooperative
  Property.

          Book-Entry Certificates:   As specified in the Preliminary Statement.

         Business Day: Any day other than (i) a Saturday or a Sunday, or (ii) a
day on which banking institutions in the City of New York, New York, the State
of California or the city in which the Corporate Trust Office of the Trustee is
located are authorized or obligated by law or executive order to be closed.

         Cap Counterparty:   Lehman Brothers Special Financing Inc.

         Certificate:   Any one of the certificates issued by the Trust Fund and
  executed by the Trustee in substantially the forms attached as exhibits.

         Certificate Account: The separate Eligible Account or Accounts created
and maintained by the Servicer pursuant to Section 3.06(d) with a depository
institution in the name of the Servicer for the benefit of the Trustee on behalf
of Certificateholders and designated "IndyMac Bank, F.S.B., in trust for the
registered holders of Residential Asset Securitization Trust 2006-A15, Mortgage
Pass-Through Certificates, Series 2006-O."

         Certificate Balance: With respect to any Certificate (other than the
Notional Amount Certificates) at any date of determination, the maximum dollar
amount of principal to which the Holder thereof is then entitled under this
Agreement, such amount being equal to the Denomination thereof (A) plus any
increase in the Certificate Balance of such Certificate pursuant to Section 4.02
due to the receipt of Subsequent Recoveries, (B) minus the sum of (i) all
distributions of principal previously made with respect thereto and (ii) all
Realized Losses allocated to that Certificate and, in the case of any



                                       9
<PAGE>

Subordinated Certificates, all other reductions in Certificate Balance
previously allocated to that Certificate pursuant to Section 4.05 and (C) in the
case of any Class of Accrual Certificates, plus the Accrual Amount added to the
Class Certificate Balance of such Class prior to such date. The Notional Amount
Certificates do not have Certificate Balances.

         Certificate Group:   Not applicable.

         Certificate Owner: With respect to a Book-Entry Certificate, the Person
who is the beneficial owner of the Book-Entry Certificate. For the purposes of
this Agreement, in order for a Certificate Owner to enforce any of its rights
under this Agreement, it shall first have to provide evidence of its beneficial
ownership interest in a Certificate that is reasonably satisfactory to the
Trustee, the Depositor and/or the Servicer, as applicable.

         Certificate Register:   The register maintained pursuant to Section
5.02.

         Certificate   Registrar:   Deutsche Bank National   Trust Company and its
successors and, if a successor   trustee is appointed   under this Agreement,   the
successor.

         Certificateholder or Holder: The person in whose name a Certificate is
registered in the Certificate Register, except that, solely for the purpose of
giving any consent pursuant to this Agreement, any Certificate registered in the
name of the Depositor or any affiliate of the Depositor is not Outstanding and
the Percentage Interest evidenced thereby shall not be taken into account in
determining whether the requisite amount of Percentage Interests necessary to
effect a consent has been obtained, except that if the Depositor or its
affiliates own 100% of the Percentage Interests evidenced by a Class of
Certificates, the Certificates shall be Outstanding for purposes of any
provision of this Agreement requiring the consent of the Holders of Certificates
of a particular Class as a condition to the taking of any action. The Trustee is
entitled to rely conclusively on a certification of the Depositor or any
affiliate of the Depositor in determining which Certificates are registered in
the name of an affiliate of the Depositor.

         Certification Party:   As defined in Section 11.05.

         Certifying Person:   As defined in Section 11.05.

         Class:   All Certificates bearing the same class designation as set
forth in the Preliminary Statement.

         Class Certificate Balance: For any Class as of any date of
determination, the aggregate of the Certificate Balances of all Certificates
of the Class as of that date.

         Class Interest Shortfall: As to any Distribution Date and Class, the
amount by which the amount described in clause (i) of the definition of Class
Optimal Interest Distribution Amount for such Class exceeds the amount of
interest actually distributed on such Class on such Distribution Date pursuant
to such clause (i).

         Class Optimal Interest Distribution Amount: With respect to any
Distribution Date and interest-bearing Class, the sum of (i) one month's
interest accrued during the related Interest Accrual Period at the Pass-Through
Rate for such Class, on the related Class Certificate Balance or Notional
Amount, as applicable, immediately prior to such Distribution Date, subject to
reduction pursuant to Section 4.02(d), and (ii) any Class Unpaid Interest
Amounts for such Class.



                                        10
<PAGE>

         Class PO Deferred Amount: As to any Distribution Date and each PO
Component, the related Allocation Percentage of the applicable PO Percentage of
each Realized Loss, other than any Excess Loss, on a Discount Mortgage Loan to
be allocated to that PO Component on such Distribution Date on or prior to the
Senior Credit Support Depletion Date or previously allocated to that PO
Component and not yet paid to the Holders of that Class PO Component.

         Class Subordination Percentage: With respect to any Distribution Date
and each Class of Subordinated Certificates, the fraction (expressed as a
percentage) the numerator of which is the Class Certificate Balance of such
Class of Subordinated Certificates immediately prior to such Distribution Date
and the denominator of which is the aggregate Class Certificate Balance of all
Classes of Certificates immediately prior to such Distribution Date.

         Class Unpaid Interest Amounts: As to any Distribution Date and Class of
interest-bearing Certificates, the amount by which the aggregate Class Interest
Shortfalls for such Class on prior Distribution Dates exceeds the amount
distributed on such Class on prior Distribution Dates pursuant to clause (ii) of
the definition of Class Optimal Interest Distribution Amount.

         Closing Date:   November 28, 2006.

         Code: The Internal Revenue Code of 1986, including any successor or
mendatory provisions.

         COFI:   Not applicable.

         COFI Certificates:   Not applicable.

         Commission:   The United States Securities and Exchange Commission.

         Compensating Interest: For any Distribution Date, 0.125% multiplied by
one-twelfth multiplied by the aggregate Stated Principal Balance of the Mortgage
Loans as of the first day of the prior month.

         Component:   As specified in the Preliminary Statement.

         Component Balance: With respect to any Component and any Distribution
Date, its Initial Component Balance (A) plus any Subsequent Recoveries added to
the Component Balance of such Component pursuant to Section 4.02, (B) minus the
sum of all amounts applied in reduction of the principal balance of such
Component and Realized Losses allocated thereto and increased due to the receipt
of Subsequent Recoveries.

         Component Certificates:   As specified in the Preliminary Statement.

         Co-op Shares:   Shares issued by a Cooperative Corporation.

         Cooperative Corporation: The entity that holds title (fee or an
acceptable leasehold estate) to the real property and improvements constituting
the Cooperative Property and that governs the Cooperative Property, which
Cooperative Corporation must qualify as a Cooperative Housing Corporation under
section 216 of the Code.

         Cooperative Loan:   Any Mortgage Loan secured by Co-op Shares and a P
roprietary Lease.



                                       11
<PAGE>

         Cooperative Property: The real property and improvements owned by the
Cooperative Corporation, including the allocation of individual dwelling units
to the holders of the Co-op Shares of the Cooperative Corporation.

         Cooperative Unit:   A single family dwelling located in a Cooperative
Property.

         Corporate Trust Office: The designated office of the Trustee in the
State of California at which at any particular time its corporate trust business
with respect to this Agreement is administered, which office at the date of the
execution of this Agreement is located at 1761 East St. Andrew Place, Santa Ana,
California 92705, Attn: Mortgage Administration-IN0615 (IndyMac MBS, Inc.,
Residential Asset Securitization Trust 2006-A15, Mortgage Pass-Through
Certificates, Series 2006-O), and which is the address to which notices to and
correspondence with the Trustee should be directed. With respect to the
Certificate Registrar and presentment of Certificates for registration or
transfer, exchange or final payment, the Corporate Trust Office is located at DB
Services Tennessee, 648 Grassmere Park Road, Nashville, Tennessee 37211-3658,
Attention: Transfer Unit.

         Corridor Contract: The interest rate corridor cap agreement between the
Supplemental Interest Trust and the Cap Counterparty evidenced by confirmation
Global ID: 2741095, 2741098 relating to the Class A-10 Certificates, a form of
which is attached to this Agreement as Exhibit P-1.

         Cut-off Date:   November 1, 2006.

         Cut-off Date Pool Principal Balance:   $478,765,558.53.

         Cut-off Date Principal Balance:   As to any Mortgage Loan, its Stated
Principal Balance as of the close
of business on the Cut-off Date.

         Debt Service Reduction: For any Mortgage Loan, a reduction by a court
of competent jurisdiction in a proceeding under the Bankruptcy Code in the
Scheduled Payment for the Mortgage Loan that became final and non-appealable,
except a reduction resulting from a Deficient Valuation or a reduction that
results in a permanent forgiveness of principal.

         Defective Mortgage Loan: Any Mortgage Loan that is required to be
repurchased pursuant to Section 2.02 or 2.03.

         Deficient Valuation: For any Mortgage Loan, a valuation by a court of
competent jurisdiction of the Mortgaged Property in an amount less than the then
outstanding indebtedness under the Mortgage Loan, or any reduction in the amount
of principal to be paid in connection with any Scheduled Payment that results in
a permanent forgiveness of principal, which valuation or reduction results from
an order of the court that is final and non-appealable in a proceeding under the
Bankruptcy Code.

         Definitive Certificates: Any Certificate evidenced by a Physical
Certificate and any Certificate issued in lieu of a Book-Entry Certificate
pursuant to Section 5.02(e).

         Delay Certificates:   As specified in the Preliminary Statement.

         Delay Delivery Certification:   A certification substantially in the
form of Exhibit G-2.

         Delay Delivery Mortgage Loans: The Mortgage Loans identified on the
Mortgage Loan Schedule for which none of a related Mortgage File or neither the
Mortgage Note nor a lost note affidavit



                                       12
<PAGE>

for a lost Mortgage Note has been delivered to the Trustee by the Closing Date.
The Depositor shall deliver the Mortgage Files to the Trustee:

         (A) for at least 70% of the Mortgage Loans, not later than the Closing
Date, and

         (B)       for the remaining 30% of the Mortgage Loans, not later than
five Business Days following the
Closing Date.

         To the extent that the Seller is in possession of any Mortgage File for
any Delay Delivery Mortgage Loan, until delivery of the Mortgage File to the
Trustee as provided in Section 2.01, the Seller shall hold the files as
Servicer, as agent and in trust for the Trustee.

          Deleted Mortgage Loan:   As defined in Section 2.03(c).

         Delinquent: A Mortgage Loan is "Delinquent" if any monthly payment due
on a Due Date is not made by the close of business on the next scheduled Due
Date for such Mortgage Loan. A Mortgage Loan is "30 days Delinquent" if such
monthly payment has not been received by the close of business on the
corresponding day of the month immediately succeeding the month in which such
monthly payment was due. The determination of whether a Mortgage Loan is "60
days Delinquent", "90 days Delinquent", etc. shall be made in a like manner.

         Denomination: For each Certificate, the amount on the face of the
Certificate as the "Initial Certificate Balance of this Certificate" or the
"Initial Notional Amount of this Certificate" or, if neither of the foregoing,
the Percentage Interest appearing on the face of the Certificate.

         Depositor:   IndyMac MBS, Inc., a Delaware corporation, or its successor
  in interest.

         Depository:   The   initial   Depository   shall be The   Depository   Trust
Company,   the   nominee of which is CEDE & Co., as the   registered   Holder of the
Book-Entry   Certificates.   The   Depository   shall at all   times   be a   "clearing
corporation" as defined in Section 8-102(a)(5) of the UCC.

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

         Derivative Notional Balance: For each Distribution Date prior to the
Termination Date, the amount described in Schedule 1 to the Prospectus
Supplement. After the Termination Date, the Derivative Notional Balance will be
equal to zero.

         Determination Date: As to any Distribution Date, the 18th day of each
month or if that day is not a Business Day the next Business Day, except that if
the next Business Day is less than two Business Days before the related
Distribution Date, then the Determination Date shall be the Business Day
preceding the 18th day of the month.

         Discount Mortgage Loan: Any Mortgage Loan with an Adjusted Net Mortgage
Rate that is less than the Required Coupon.

         Distribution Account: The separate Eligible Account created and
maintained by the Trustee pursuant to Section 3.06(e) in the name of the Trustee
for the benefit of the Certificateholders and designated "Deutsche Bank National
Trust Company in trust for registered holders of Residential Asset
Securitization Trust 2006-A15, Mortgage Pass-Through Certificates, Series
2006-O." Funds in the



                                       13
<PAGE>

Distribution Account shall be held in trust for the Certificateholders for the
uses and purposes set forth in this Agreement.

          Distribution Account Deposit Date: As to any Distribution Date, 12:30
P.M. Pacific time on the Business Day preceding the Distribution Date.

         Distribution Date: The 25th day of each calendar month after the
initial issuance of the Certificates, or if that day is not a Business Day, the
next Business Day, commencing in December 2006.

         Due Date: For any Mortgage Loan and Distribution Date, the first day of
the month in which such Distribution Date occurs.

         Due Period: For any Distribution Date, the period commencing on the
second day of the month preceding the month in which the Distribution Date
occurs and ending on the first day of the month in which the Distribution Date
occurs.

         EDGAR: The Commission's Electronic Data Gathering, Analysis and
Retrieval System.

         Eligible Account: Any of

         (i) an account or accounts maintained with a federal or state chartered
depository institution or trust company the short-term unsecured debt
obligations of which (or, in the case of a depository institution or trust
company that is the principal subsidiary of a holding company, the debt
obligations of such holding company) have the highest short-term ratings of
Moody's or Fitch and one of the two highest short-term ratings of S&P, if S&P is
a Rating Agency at the time any amounts are held on deposit therein, or

         (ii) an account or accounts in a depository institution or trust
company in which such accounts are insured by the FDIC (to the limits
established by the FDIC) and the uninsured deposits in which accounts are
otherwise secured such that, as evidenced by an Opinion of Counsel delivered to
the Trustee and to each Rating Agency, the Certificateholders have a claim with
respect to the funds in such account or a perfected first priority security
interest against any collateral (which shall be limited to Permitted
Investments) securing such funds that is superior to claims of any other
depositors or creditors of the depository institution or trust company in which
such account is maintained, or

         (iii) a trust account or accounts maintained with (a) the trust
department of a federal or state chartered depository institution or (b) a trust
company, acting in its fiduciary capacity or

         (iv) any other account acceptable to each Rating Agency..

Eligible Accounts may bear interest, and may include, if otherwise qualified
under this definition, accounts maintained with the Trustee.

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

         ERISA-Qualifying Underwriting: A best efforts or firm commitment
underwriting or private placement that meets the requirements of the
Underwriter's Exemption.

         ERISA-Restricted Certificate: As specified in the Preliminary
Statement.



                                       14
<PAGE>

         Escrow Account: The Eligible Account or Accounts established and
maintained pursuant to Section 3.07(a).

         Event of Default:   As defined in Section 7.01.

         Excess Loss: The amount of any (i) Fraud Loss on the Mortgage Loans
realized after the Fraud Loss Coverage Termination Date, (ii) Special Hazard
Loss on the Mortgage Loans realized after the Special Hazard Coverage
Termination Date or (iii) Bankruptcy Loss on the Mortgage Loans realized after
the Bankruptcy Coverage Termination Date.

         Excess Proceeds:   For any Liquidated Mortgage Loan, the excess of

         (a) all Liquidation Proceeds from the Mortgage Loan received in the
calendar month in which the Mortgage Loan became a Liquidated Mortgage Loan, net
of any amounts previously reimbursed to the Servicer as Nonrecoverable Advances
with respect to the Mortgage Loan pursuant to Section 3.09(a)(iii), over

         (b) the sum of (i) the unpaid principal balance of the Liquidated
Mortgage Loan as of the Due Date in the month in which the Mortgage Loan became
a Liquidated Mortgage Loan plus (ii) accrued interest at the Mortgage Rate from
the Due Date for which interest was last paid or advanced (and not reimbursed)
to Certificateholders up to the Due Date applicable to the Distribution Date
following the calendar month during which the liquidation occurred.

         Exchange Act: The Securities Exchange Act of 1934, as amended, and the
rules and regulations promulgated thereunder.

         Exchange Act Reports: Any reports on Form 10-D, Form 8-K and Form 10-K
required to be filed by the Depositor with respect to the Trust Fund under the
Exchange Act.

         Expense Fee Rate: As to each Mortgage Loan, the sum of (a) the related
Servicing Fee Rate and (b) the Trustee Fee Rate.

         FDIC: The Federal Deposit Insurance Corporation, or any successor
thereto.

         FHLMC: The Federal Home Loan Mortgage Corporation, a corporate
instrumentality of the United States created and existing under Title III of the
Emergency Home Finance Act of 1970, as amended, or any successor thereto.

         Fitch: Fitch, Inc., or any successor thereto. If Fitch is designated as
a Rating Agency in the Preliminary Statement, for purposes of Section 10.05(b)
the address for notices to Fitch shall be Fitch, Inc., One State Street Plaza,
New York, NY 10004, Attention: MBS Monitoring - IndyMac 2006-O, or any other
address Fitch furnishes to the Depositor and the Servicer.

         FNMA: The Federal National Mortgage Association, a federally chartered
and privately owned corporation organized and existing under the Federal
National Mortgage Association Charter Act, or any successor thereto.

         Form 10-D Disclosure Item: With respect to any Person, any material
litigation or governmental proceedings pending against such Person, or against
any of the Trust Fund, the Depositor, the Trustee or the Servicer, if such
Person has actual knowledge thereof.



                                        15
<PAGE>

         Form 10-K Disclosure Item: With respect to any Person, (a) Form 10-D
Disclosure Item, and (b) any affiliations or relationships between such Person
and any Item 1119 Party.

         Fraud Loan: A Liquidated Mortgage Loan as to which a Fraud Loss has
occurred.

         Fraud Loss Coverage Amount: As of the Closing Date, $9,575,311.16,
subject to reduction from time to time, by the amount of Fraud Losses allocated
to the Certificates. In addition, on each anniversary of the Cut-off Date, the
Fraud Loss Coverage Amount will be reduced as follows: (a) on the first, second,
third and fourth anniversaries of the Cut-off Date, to an amount equal to the
lesser of (i) 2% of the then current Stated Principal Balance of the Mortgage
Loans in the case of the first such anniversary and 1% of the then-current
Stated Principal Balance of the Mortgage Loans in the case of the second, third
and fourth such anniversaries and (ii) the excess of the Fraud Loss Coverage
Amount as of the preceding anniversary of the Cut-off Date over the cumulative
amount of Fraud Losses allocated to the Certificates since such preceding
anniversary; and (b) on the fifth anniversary of the Cut-off Date, to zero.

         Fraud Loss Coverage Termination Date: The point in time at which the
Fraud Loss Coverage Amount is reduced to zero.

         Fraud Losses: Realized Losses on Mortgage Loans as to which a loss is
sustained by reason of a default arising from fraud, dishonesty or
misrepresentation in connection with the related Mortgage Loan, including a loss
by reason of the denial of coverage under any related Primary Insurance Policy
because of such fraud, dishonesty or misrepresentation.

         Group:   Group 1A or Group 1B, as applicable.

         Group 1A: The Class A-R, Class A-1, Class A-2, Class A-3, Class A-4,
Class A-5, Class A-6, Class A-7 and Class A-8 Certificates and the Group 1A PO
Component and the Group 1A Subordinated Portion.

         Group 1A Allocation Percentage: For any Distribution Date will equal
the percentage equivalent of a fraction, the numerator of which is the sum of
(x) the aggregate Class Certificate Balance of the Class A-R, Class A-1, Class
A-2, Class A-3, Class A-5, Class A-6, Class A-7 and Class A-8 Certificates, (y)
the Component Balance of the Group 1A PO Component and (z) the Group 1A
Subordinated Portion Balance, and the denominator of which is the aggregate
Stated Principal Balance of Mortgage Loans as of the Due Date in the month of
such Distribution Date (after giving effect to the Principal Prepayments in the
Prepayment Period related to that Distribution Date).

         Group 1A Non-PO Collateral Balance: For any Distribution Date will
equal the aggregate Class Certificate Balance of the Class A-R, Class A-1, Class
A-2, Class A-3, Class A-5, Class A-6, Class A-7 and Class A-8 Certificates and
the Group 1A Subordinated Portion Balance for that Distribution Date.

         Group 1A Prepayment Assumption: The prepayment model used in the
Prospectus Supplement, which represents an assumed rate of prepayment each month
relative to the then outstanding principal balance of a pool of mortgage loans
for the life of those mortgage loans. A 100% Prepayment Assumption assumes a
constant prepayment rate (a "CPR") of 6% per annum and an additional
approximately 1.0909090909% per annum in each month thereafter until the twelfth
month. Beginning in the twelfth month and in each month thereafter during the
life of the mortgage loans, a 100% Prepayment Assumption assumes a CPR of 18%
per annum each month. 0% PPC assumes no prepayments. Correspondingly, 150% PPC
assumes prepayment rates equal to two times the related PPC, and so forth.



                                       16
<PAGE>

         Group 1A Priority Amount: For any Distribution Date, the sum of (i) the
product of (A) the Group 1A Scheduled Principal Distribution Amount, (B) the
Group 1A Priority Percentage and (C) the Shift Percentage and (ii) the product
of (A) the Group 1A Unscheduled Principal Distribution Amount, (B) the Group 1A
Priority Percentage and (C) the Shift Percentage.

         Group 1A Priority Percentage: For any Distribution Date, the percentage
equivalent of a fraction, the numerator of which is the aggregate Class
Certificate Balance of the Class A-5 and Class A-7 Certificates immediately
prior to that Distribution Date, and the denominator of which is the aggregate
Class Certificate Balance of the Group 1A Non-Collateral Balance immediately
prior to that Distribution Date.

         Group 1A Scheduled Principal Distribution Amount: For any Distribution
Date will equal the Non-PO Percentage of all amounts described in subclauses (a)
through (d) of clause (i) of the definition of Non-PO Formula Principal Amount
for Group 1A for such Distribution Date; provided, however, that if a Bankruptcy
Loss that is an Excess Loss is sustained with respect to a Mortgage Loan that is
not a Liquidated Mortgage Loan, the Group 1A Scheduled Principal Distribution
Amount will be reduced on the related Distribution Date by the product of (i)
the Group 1A Allocation Percentage and (ii) the applicable Non-PO Percentage of
the principal portion of such Bankruptcy Loss.

         Group 1A Subordinated Portion: The portion of the Subordinate
Certificates related to Group 1A.

         Group 1A Subordinated Portion Balance: For each Distribution Date will
equal $11.153,896.92 minus all amounts applied and losses allocated in reduction
of the Subordinated Portion Balance and increased by the Group 1A Allocation
Percentage of Subsequent Recoveries on the Mortgage Loans.

         Group 1A Unscheduled Principal Distribution Amount: For any
Distribution Date will equal the Non-PO Percentage of the sum of the amounts set
forth under subclauses (e) and (f) of clause (i) of the definition of Non-PO
Formula Principal Amount for Group 1A for such Distribution Date and (ii) any
Subsequent Recoveries described in clause (ii) of the definition of Non-PO
Formula Principal Amount for Group 1A for that Distribution Date.

         Group 1B: The Class A-9, Class A-10, Class A-11, Class A-12, Class
A-13, Class A-14, Class A-15, Class A-16 and Class A-17 Certificates and the
Group 1B PO Component and the Group 1B Subordinated Portion.

         Group 1B Allocation Percentage: For any Distribution Date will equal
the percentage equivalent of a fraction, the numerator of which is the sum of
(x) the aggregate Class Certificate Balance of the Class A-9, Class A-10, Class
A-12, Class A-13, Class A-14, Class A-15, Class A-16 and Class A-17 Certificates
(y) the Component Balance of the Group 1B PO Component and (z) the Group 1B
Subordinated Portion Balance and the denominator of which is the aggregate
Stated Principal Balance of the Mortgage Loans as of the Due Date in the month
of such Distribution Date (after giving effect to the Principal Prepayments in
the Prepayment Period related to that Distribution Date).

         Group 1B Non-PO Collateral Balance: For any Distribution Date will
equal the aggregate Class Certificate Balance of the Class A-9, Class A-10,
Class A-12, Class A-13, Class A-14, Class A-15, Class A-16 and Class A-17
Certificates and the Group 1B Subordinated Portion Balance for that Distribution
Date.

         Group 1B Prepayment Assumption: The prepayment model used in the
Prospectus Supplement, which represents an assumed rate of prepayment each month
relative to the then outstanding principal



                                       17
<PAGE>

balance of a pool of mortgage loans for the life of those mortgage loans. A 100%
Prepayment Assumption assumes a CPR of 10% per annum and an additional
approximately 1.4545454545% per annum in each month thereafter until the twelfth
month. Beginning in the twelfth month and in each month thereafter during the
life of the mortgage loans, a 100% Prepayment Assumption assumes a CPR of 24%
per annum each month. 0% PPC assumes no prepayments. Correspondingly, 150% PPC
assumes prepayment rates equal to two times the related PPC, and so forth.

         Group 1B Priority Amount: For any Distribution Date, the sum of (i) the
product of (A) the Group 1B Scheduled Principal Distribution Amount, (B) the
Group 1B Priority Percentage and (C) the Shift Percentage and (ii) the product
of (A) the Group 1B Unscheduled Principal Distribution Amount, (B) the Group 1B
Priority Percentage and (C) the Shift Percentage.

         Group 1B Priority Percentage: For any Distribution Date, the percentage
equivalent of a fraction, the numerator of which is the aggregate Class
Certificate Balance of the Class A-13, Class A-15 and Class A-17 Certificates
immediately prior to that Distribution Date, and the denominator of which is the
aggregate Class Certificate Balance of the Group 1B Non-PO Collateral Balance
immediately prior to that Distribution Date.

         Group 1B Scheduled Principal Distribution Amount: For any Distribution
Date will equal the Non-PO Percentage of all amounts described in subclauses (a)
through (d) of clause (i) of the definition of Non-PO Formula Principal Amount
for Group 1B for such Distribution Date; provided, however, that if a Bankruptcy
Loss that is an Excess Loss is sustained with respect to a Mortgage Loan that is
not a Liquidated Mortgage Loan, the Group 1B Scheduled Principal Distribution
Amount will be reduced on the related Distribution Date by the product of (i)
the Group 1B Allocation Percentage and (ii) the Non-PO Percentage of the
principal portion of such Bankruptcy Loss.

         Group 1B Subordinated Portion: The portion of the Subordinate
Certificates related to Group 1B.

         Group 1B Subordinated Portion Balance: For each Distribution Date will
equal $16,376,173.17 minus all amounts applied and losses allocated in reduction
of the Subordinated Portion Balance and increased by the Group 1B Allocation
Percentage of Subsequent Recoveries on the Mortgage Loans.

         Group 1B Unscheduled Principal Distribution Amount: For any
Distribution Date will equal the Non-PO Percentage of the sum of the amounts set
forth under subclauses (e) and (f) of clause (i) of the definition of Non-PO
Formula Principal Amount for Group 1B for such Distribution Date and (ii) any
Subsequent Recoveries described in clause (ii) of the definition of Non-PO
Formula Principal Amount for Group 1B for that Distribution Date.

         Indirect Participant: A broker, dealer, bank, or other financial
institution or other Person that clears through or maintains a custodial
relationship with a Depository Participant.

         Initial Bankruptcy Loss Coverage Amount:   $154,202.69.

         Initial Component Balance:   As specified in the Preliminary Statement.

         Initial LIBOR Rate:   5.32% per annum.

         Insurance Policy: For any Mortgage Loan included in the Trust Fund, any
insurance policy, including all riders and endorsements thereto in effect,
including any replacement policy or policies for any Insurance Policies.



                                       18
<PAGE>

         Insurance Proceeds: Proceeds paid by an insurer pursuant to any
Insurance Policy, in each case other than any amount included in such Insurance
Proceeds in respect of Insured Expenses.

         Insured Expenses: Expenses covered by an Insurance Policy or any other
insurance policy with respect to the Mortgage Loans.

         Interest Accrual Period: With respect to each Class of Delay
Certificates and any Distribution Date, the calendar month prior to the month of
such Distribution Date. With respect to each Class of Non-Delay Certificates and
any Distribution Date, the one-month period commencing on the 25th day of the
month preceding the month in which such Distribution Date occurs and ending on
the 24th day of the month in which such Distribution Date occurs. All Classes of
Certificates will accrue interest on the basis of a 360-day year consisting of
twelve 30-day months.

         Interest Determination Date: With respect to (a) any Interest Accrual
Period for any LIBOR Certificates and (b) any Interest Accrual Period for the
COFI Certificates for which the applicable Index is LIBOR, the second Business
Day prior to the first day of such Interest Accrual Period.

         Interest Settlement Rate:   As defined in Section 4.09.

         Item 1119 Party: The Depositor, the Seller, the Servicer, the Trustee,
the Cap Counterparty and any other material transaction party, as identified in
Exhibit T, as updated pursuant to Section 11.04.

         Last Scheduled Distribution Date: The Distribution Date in the month
immediately following the month of the latest scheduled maturity date for any of
the Mortgage Loans.

         Latest Possible Maturity Date: The Distribution Date following the
third anniversary of the scheduled maturity date of the Mortgage Loan having the
latest scheduled maturity date as of the Cut-off Date.

         Lender PMI Loans: Mortgage Loans with respect to which the lender
rather than the borrower acquired the primary mortgage guaranty insurance and
charged the related borrower an interest premium.

         LIBOR: The London interbank offered rate for one month United States
dollar deposits calculated in the manner described in Section 4.09.

         LIBOR Determination Date: For any Interest Accrual Period, the second
London Business Day prior to the commencement of such Interest Accrual Period.

         Limited Exchange Act Reporting Obligations: The obligations of the
Servicer under Section 3.17(b), Section 6.02 and Section 6.04 with respect to
notice and information to be provided to the Depositor and Article 11 (except
Section 11.07(a)(i) and (ii)).

         Liquidated Mortgage Loan: For any Distribution Date, a defaulted
Mortgage Loan (including any REO Property) that was liquidated in the calendar
month preceding the month of the Distribution Date and as to which the Servicer
has certified (in accordance with this Agreement) that it has received all
amounts it expects to receive in connection with the liquidation of the Mortgage
Loan, including the final disposition of an REO Property.

         Liquidation Proceeds: Amounts, including Insurance Proceeds regardless
of when received, received in connection with the partial or complete
liquidation of defaulted Mortgage Loans, whether through trustee's sale,
foreclosure sale, or otherwise or amounts received in connection with any


                                       19
<PAGE>

condemnation or partial release of a Mortgaged Property, and any other proceeds
received in connection with an REO Property, less the sum of related
unreimbursed Servicing Fees, Servicing Advances, and Advances.

         Loan Group:   Not applicable.

         Loan-to-Value Ratio: For any Mortgage Loan and as of any date of
determination, is the fraction whose numerator is the original principal balance
of the related Mortgage Loan at that date of determination and whose denominator
is the Appraised Value of the related Mortgaged Property.

          London Business Day: Any day on which dealings in deposits of United
States dollars are transacted in the London interbank market.

         Lost Mortgage Note: Any Mortgage Note the original of which was
permanently lost or destroyed and has not been replaced.

         Maintenance: For any Cooperative Unit, the rent paid by the Mortgagor
to the Cooperative Corporation pursuant to the Proprietary Lease.

         MERS: Mortgage Electronic Registration Systems, Inc., a corporation
organized and existing under the laws of the State of Delaware, or any successor
thereto.

         MERS Mortgage Loan: Any Mortgage Loan registered with MERS on the
MERS(R) System.

         MERS(R) System: The system of recording transfers of mortgages
electronically maintained by MERS.

         MIN:   The mortgage identification number for any MERS Mortgage Loan.

         MOM Loan: Any Mortgage Loan as to which MERS is acting as mortgagee,
solely as nominee for the originator of such Mortgage Loan and its successors
and assigns.

         Moneyline Telerate Page 3750: The display page currently so designated
on the Moneyline Telerate Information Services, Inc. (or any page replacing that
page on that service for the purpose of displaying London inter-bank offered
rates of major banks).

         Monthly Statement: The statement delivered to the Certificateholders
pursuant to Section 4.06.

         Moody's: Moody's Investors Service, Inc., or any successor thereto. If
Moody's is designated as a Rating Agency in the Preliminary Statement, for
purposes of Section 10.05(b) the address for notices to Moody's shall be Moody's
Investors Service, Inc., 99 Church Street, New York, New York 10007, Attention:
Residential Loan Monitoring Group, or any other address that Moody's furnishes
to the Depositor and the Servicer.

         Mortgage: The mortgage, deed of trust, or other instrument creating a
first lien on an estate in fee simple or leasehold interest in real property
securing a Mortgage Note.

         Mortgage File: The mortgage documents listed in Section 2.01 pertaining
to a particular Mortgage Loan and any additional documents delivered to the
Trustee to be added to the Mortgage File pursuant to this Agreement.



                                       20
<PAGE>

         Mortgage Loans: Such of the mortgage loans transferred and assigned to
the Trustee pursuant to this Agreement, as from time to time are held as a part
of the Trust Fund (including any REO Property), the Mortgage Loans so held being
identified on the Mortgage Loan Schedule, notwithstanding foreclosure or other
acquisition of title of the related Mortgaged Property.

         Mortgage Loan Schedule: As of any date, the list set forth in Schedule
I of Mortgage Loans included in the Trust Fund on that date. The Mortgage Loan
Schedule shall be prepared by the Seller and shall set forth the following
information with respect to each Mortgage Loan:

                  (i)       the loan number;

                  (ii)      the street address of the Mortgaged Property,
                            including the zip code;

                  (iii)     the maturity date;

                  (iv)      the original principal balance;

                  (v)       the Cut-off Date Principal Balance;

                  (vi)      the first payment date of the Mortgage Loan;

                  (vii)     the Scheduled Payment in effect as of the Cut-off
                           Date;

                  (viii)    the Loan-to-Value Ratio at origination;

                  (ix)      a code indicating whether the residential dwelling at
                           the time of origination was represented to be
                           owner-occupied;

                  (x)       a code indicating whether the residential dwelling is
                            either (a) a detached single family dwelling, (b) a
                           dwelling in a PUD, (c) a condominium unit, (d) a two-
                           to four-unit residential property, or (e) a
                           Cooperative Unit;

                  (xi)      the Mortgage Rate;

                  (xii)     the purpose for the Mortgage Loan;

                  (xiii)    the type of documentation program pursuant to which
                           the Mortgage Loan was originated;

                  (xiv)     a code indicating whether the Mortgage Loan is a
                           borrower-paid mortgage insurance loan;

                  (xv)      the Servicing Fee Rate;

                  (xvi)     a code indicating whether the Mortgage Loan is a
                           Lender PMI Loan;

                  (xvii)    the coverage amount of any mortgage insurance;

                  (xviii)   with respect to the Lender PMI Loans, the interest
                           premium charged by the lender;



                                       21
<PAGE>

                  (xix)     a code indicating whether the Mortgage Loan is a
                           Delay Delivery Mortgage Loan; and

                  (xx)      a code indicating whether the Mortgage Loan is a MERS
                           Mortgage Loan.

The schedule shall also set forth the total of the amounts described under (v)
above for all of the Mortgage Loans.

         Mortgage Note: The original executed note or other evidence of the
indebtedness of a Mortgagor under a Mortgage Loan.

         Mortgage Rate: The annual rate of interest borne by a Mortgage Note
from time to time (net of the interest premium for any Lender PMI Loan).

         Mortgaged Property: The underlying property securing a Mortgage Loan,
which, with respect to a Cooperative Loan, is the related Co-op Shares and
Proprietary Lease.

         Mortgagor:   The obligors on a Mortgage Note.

         National Cost of Funds Index: The National Monthly Median Cost of Funds
Ratio to SAIF-Insured Institutions published by the OTS.

         Net Prepayment Interest Shortfall: As to any Distribution Date, the
amount by which the aggregate of Prepayment Interest Shortfalls for such
Distribution Date exceeds the Compensating Interest for such Distribution Date.

         Non-Delay Certificates:   As specified in the Preliminary Statement.

         Non-Discount Mortgage Loan: As to any Mortgage Loan with an Adjusted
Net Mortgage Rate that is greater than or equal to the Required Coupon.

         Non-PO Formula Principal Amount: As to any Distribution Date and for
each Group, the sum of (i) the applicable Non-PO Percentage of (a) the
applicable Allocation Percentage of all monthly payments of principal due on
each Mortgage Loan on the related Due Date, (b) the applicable Allocation
Percentage of the principal portion of the purchase price of each Mortgage Loan
that was repurchased by the Seller pursuant to this Agreement as of such
Distribution Date, excluding any Mortgage Loan that was repurchased due to a
modification of the Mortgage Loan in lieu of refinancing, (c) the applicable
Allocation Percentage of the Substitution Adjustment Amount in connection with
any Deleted Mortgage Loan received with respect to such Distribution Date, (d)
the applicable Allocation Percentage of any Insurance Proceeds or Liquidation
Proceeds allocable to recoveries of principal of Mortgage Loans that are not yet
Liquidated Mortgage Loans received during the calendar month preceding the month
of such Distribution Date, (e) the applicable Allocation Percentage with respect
to each Mortgage Loan that became a Liquidated Mortgage Loan during the calendar
month preceding the month of such Distribution Date, the amount of Liquidation
Proceeds allocable to principal received with respect to such Mortgage Loan, and
(f) the applicable Allocation Percentage of all partial and full Principal
Prepayments received during the related Prepayment Period, including the
principal portion of the purchase price of any Mortgage Loan that was
repurchased due to a modification of the Mortgage Loan in lieu of refinancing
and (ii) the applicable Allocation Percentage of (A) any Subsequent Recoveries
received during the calendar month preceding the month of such Distribution
Date, or (B) with respect to Subsequent Recoveries attributable to a Discount
Mortgage Loan that incurred (1) an Excess Loss or (2) a Realized



                                       22
<PAGE>

Loss after the Senior Credit Support Depletion Date, the Non-PO Percentage of
any Subsequent Recoveries received during the calendar month preceding the month
of such Distribution Date.

         Non-PO Percentage: As to any Discount Mortgage Loan, a fraction
(expressed as a percentage) the numerator of which is the Adjusted Net Mortgage
Rate of such Discount Mortgage Loan and the denominator of which is the Required
Coupon. As to any Non-Discount Mortgage Loan, 100%.

         Nonrecoverable Advance: Any portion of an Advance previously made or
proposed to be made by the Servicer, that, in the good faith judgment of the
Servicer, will not be ultimately recoverable by the Servicer from the related
Mortgagor, related Liquidation Proceeds or otherwise.

         Notice of Final Distribution: The notice to be provided pursuant to
Section 9.02 to the effect that final distribution on any of the Certificates
shall be made only upon presentation and surrender thereof.

         Notional Amount: With respect to the Class A-X Certificates and any
Distribution Date, an amount equal to the product of (i) a fraction, the
numerator of which is the excess of (a) the weighted average of the Adjusted Net
Mortgage Rates for the Non-Discount Mortgage Loans as of the Due Date in the
prior month (after giving effect to Principal Prepayments received in the
Prepayment Period related to that prior Due Date) over (b) the Required Coupon,
and the denominator of which is the Required Coupon and (ii) the aggregate
Stated Principal Balance of the Non-Discount Mortgage Loans as of the Due Date
in the prior month (after giving effect to Principal Prepayments received in the
Prepayment Period related to that prior Due Date). With respect to the Class A-4
Certificates and any Distribution Date, will equal the product of (i) a
fraction, the numerator of which is 0.25% and the denominator of which is 6.00%
and (ii) the Class Certificate Balance of the Class A-6 Certificates for that
Distribution Date. With respect to the Class A-11 Certificates and any
Distribution Date, an amount equal to the aggregate Class Certificate Balance of
the Class A-10 Certificates immediately prior to that Distribution Date.

         Notional Amount Certificates:   As specified in the Preliminary
Statement.

         Offered Certificates:   As specified in the Preliminary Statement.

         Officer's Certificate: A certificate (i) signed by the Chairman of the
Board, the Vice Chairman of the Board, the President, a Managing Director, a
Vice President (however denominated), an Assistant Vice President, the
Treasurer, the Secretary, or one of the Assistant Treasurers or Assistant
Secretaries of the Depositor or the Servicer, or (ii) if provided for in this
Agreement, signed by a Servicing Officer, as the case may be, and delivered to
the Depositor and the Trustee as required by this Agreement.

         Opinion of Counsel: For the interpretation or application of the REMIC
Provisions, a written opinion of counsel who (i) is in fact independent of the
Depositor and the Servicer, (ii) does not have any direct financial interest in
the Depositor or the Servicer or in any affiliate of either, and (iii) is not
connected with the Depositor or the Servicer as an officer, employee, promoter,
underwriter, trustee, partner, director, or person performing similar functions.
Otherwise, a written opinion of counsel who may be counsel for the Depositor or
the Servicer, including in-house counsel, reasonably acceptable to the Trustee.

         Original Applicable Credit Support Percentage: With respect to each of
the following Classes of Subordinated Certificates, the corresponding percentage
described below, as of the Closing Date:



                                       23
<PAGE>

          Class B-1....................................       5.75%
          Class B-2....................................       3.60%
          Class B-3....................................       2.40%
          Class B-4....................................       1.70%
          Class B-5....................................       0.95%
          Class B-6....................................       0.40%


         Original Mortgage Loan: The Mortgage Loan refinanced in connection with
the origination of a Refinance Loan.

         Original Subordinated Principal Balance: The aggregate Class
Certificate Balance of the Subordinated Certificates as of the Closing Date

         OTS:   The Office of Thrift Supervision.

         Outside Reference Date:   Not applicable.

         Outstanding: For the Certificates as of any date of determination, all
Certificates theretofore executed and authenticated under this Agreement except:

            (i)       Certificates theretofore canceled by the Trustee or
                     delivered to the Trustee for cancellation; and

            (ii)      Certificates in exchange for which or in lieu of
                     which other Certificates have been executed and
                     delivered by the Trustee pursuant to this Agreement.

         Outstanding Mortgage Loan: As of any Due Date, a Mortgage Loan with a
Stated Principal Balance greater than zero that was not the subject of a
Principal Prepayment in Full before the Due Date or during the related
Prepayment Period and that did not become a Liquidated Mortgage Loan before the
Due Date.

         Overcollateralized Group:   Not applicable.

         Ownership Interest: As to any Residual Certificate, any ownership
interest in the Certificate including any interest in the Certificate as its
Holder and any other interest therein, whether direct or indirect, legal or
beneficial.

          Pass-Through Rate: For each Class of Certificates, the per annum rate
set forth or calculated in the manner described in the Preliminary Statement.

         Percentage Interest: As to any Certificate, the percentage interest
evidenced thereby in distributions required to be made on the related Class, the
percentage interest being set forth on its face or equal to the percentage
obtained by dividing the Denomination of the Certificate by the aggregate of the
Denominations of all Certificates of the same Class.

         Performance Certification:   As defined in Section 11.05.

         Permitted Investments:   At any time, any of the following:



                                       24
<PAGE>

         (i) obligations of the United States or any agency thereof backed by
the full faith and credit of the United States;

         (ii) general obligations of or obligations guaranteed by any state of
the United States or the District of Columbia receiving the highest long-term
debt rating of each Rating Agency, or any lower rating that will not result in
the downgrading, qualification or withdrawal of the ratings then assigned to the
Certificates by the Rating Agencies, as evidenced by a signed writing delivered
by each Rating Agency;

         (iii) commercial or finance company paper that is then receiving the
highest commercial or finance company paper rating of each Rating Agency, or any
lower rating that will not result in the downgrading, qualification or
withdrawal of the ratings then assigned to the Certificates by the Rating
Agencies , as evidenced by a signed writing delivered by each Rating Agency;

         (iv) certificates of deposit, demand or time deposits, or bankers'
acceptances issued by any depository institution or trust company incorporated
under the laws of the United States or of any state thereof and subject to
supervision and examination by federal or state banking authorities, provided
that the commercial paper or long-term unsecured debt obligations of the
depository institution or trust company (or in the case of the principal
depository institution in a holding company system, the commercial paper or
long-term unsecured debt obligations of the holding company, but only if Moody's
is not a Rating Agency) are then rated one of the two highest long-term and the
highest short-term ratings of each Rating Agency for the securities, or any
lower rating that will not result in the downgrading, qualification or
withdrawal of the ratings then assigned to the Certificates by the Rating
Agencies, as evidenced by a signed writing delivered by each Rating Agency;

         (v) demand or time deposits or certificates of deposit issued by any
bank or trust company or savings institution to the extent that the deposits are
fully insured by the FDIC;

         (vi) guaranteed reinvestment agreements issued by any bank, insurance
company, or other corporation acceptable to the Rating Agencies at the time of
the issuance of the agreements, as evidenced by a signed writing delivered by
each Rating Agency;

         (vii) repurchase obligations with respect to any security described in
clauses (i) and (ii) above, in either case entered into with a depository
institution or trust company (acting as principal) described in clause (iv)
above; provided that such repurchase obligation would be accounted for as a
financing arrangement under generally accepted accounting principles;

         (viii) securities (other than stripped bonds, stripped coupons, or
instruments sold at a purchase price in excess of 115% of their face amount)
bearing interest or sold at a discount issued by any corporation incorporated
under the laws of the United States or any state thereof that, at the time of
the investment, have one of the two highest ratings of each Rating Agency
(except if the Rating Agency is Moody's the rating shall be the highest
commercial paper rating of Moody's for the securities), or any lower rating that
will not result in the downgrading, qualification or withdrawal of the ratings
then assigned to the Certificates by the Rating Agencies, as evidenced by a
signed writing delivered by each Rating Agency and that have a maturity date
occurring no more than 365 days from their date of issuance;

         (ix) units of a taxable money-market portfolio having the highest
rating assigned by each Rating Agency (except (i) if Fitch is a Rating Agency
and has not rated the portfolio, the highest rating assigned by Moody's and (ii)
if S&P is a Rating Agency, "AAAm" or "AAAM-G" by S&P) and restricted to
obligations issued or guaranteed by the United States of America or entities
whose



                                       25
<PAGE>

obligations are backed by the full faith and credit of the United States
of America and repurchase agreements collateralized by such obligations; and

         (x) any other investments bearing interest or sold at a discount
acceptable to each Rating Agency that will not result in the downgrading,
qualification or withdrawal of the ratings then assigned to the Certificates by
the Rating Agencies, as evidenced by a signed writing delivered by each Rating
Agency.

         No Permitted Investment may (i) evidence the right to receive interest
only payments with respect to the obligations underlying the instrument, (ii) be
sold or disposed of before its maturity or (iii) be any obligation of the Seller
or any of its Affiliates. Any Permitted Investment shall be relatively risk free
and no options or voting rights shall be exercised with respect to any Permitted
Investment. Any Permitted Investment shall be sold or disposed of in accordance
with Financial Accounting Standard 140, paragraph 35c(6) in effect as of the
Closing Date.

         Permitted Transferee:   Any person other than

         (i) the United States, any State or political subdivision thereof, or
any agency or instrumentality of any of the foregoing,

         (ii) a foreign government, International Organization, or any agency or
instrumentality of either of the foregoing,

         (iii) an organization (except certain farmers' cooperatives described
in section 521 of the Code) that is exempt from tax imposed by Chapter 1 of the
Code (including the tax imposed by section 511 of the Code on unrelated business
taxable income) on any excess inclusions (as defined in section 860E(c)(1) of
the Code) with respect to any Residual Certificate,

         (iv) a rural electric and telephone cooperatives described in section
1381(a)(2)(C) of the Code,

         (v) an "electing large partnership" as defined in section 775 of the
Code,

          (vi) a Person that is not a U.S. Person, and

         (vii) any other Person so designated by the Depositor based on an
Opinion of Counsel that the Transfer of an Ownership Interest in a Residual
Certificate to the Person may cause any REMIC created hereunder to fail to
qualify as a REMIC at any time that the Certificates are outstanding.

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

         Physical Certificates:   As specified in the Preliminary Statement.

         Planned Balance: With respect to any Planned Principal Classes and any
Distribution Date appearing in the Principal Balance Schedule, the applicable
amount appearing opposite such Distribution Date for such Planned Principal
Classes..

         Planned Principal Classes:   As specified in the Preliminary Statement.



                                       26
<PAGE>

         PO Formula Principal Amount: As to any Distribution Date and the Class
PO Certificates, the sum of (i) the sum of the applicable PO Percentage of (a)
the related Allocation Percentage of the principal portion of each Scheduled
Payment (without giving effect, prior to the Bankruptcy Coverage Termination
Date, to any reductions thereof caused by any Debt Service Reductions or
Deficient Valuations) due on each Mortgage Loan on the related Due Date, (b) the
related Allocation Percentage of the Stated Principal Balance of each Mortgage
Loan that was repurchased by the Seller or purchased by the Servicer pursuant to
this Agreement as of such Distribution Date, excluding any Mortgage Loan that
was repurchased due to a modification of the Mortgage Rate, (c) the related
Allocation Percentage of the Substitution Adjustment Amount in connection with
any Deleted Mortgage Loan received with respect to such Distribution Date, (d)
the related Allocation Percentage of any Insurance Proceeds or Liquidation
Proceeds allocable to recoveries of principal of Mortgage Loans that are not yet
Liquidated Mortgage Loans received during the calendar month preceding the month
of such Distribution Date, (e) the related Allocation Percentage of with respect
to each Mortgage Loan that became a Liquidated Mortgage Loan during the month
preceding the calendar month of such Distribution Date, the amount of
Liquidation Proceeds allocable to principal received with respect to such
Mortgage Loan during the month preceding the month of such Distribution Date,
and (f) the related Allocation Percentage of all Principal Prepayments with
respect to the Mortgage Loans received during the related Prepayment Period, and
(ii) with respect to Subsequent Recoveries attributable to a Discount Mortgage
Loan that incurred (1) an Excess Loss or (2) a Realized Loss after the Senior
Credit Support Depletion Date, the related Allocation Percentage of the PO
Percentage of any Subsequent Recoveries received during the calendar month
preceding the month of such Distribution Date.

         PO Percentage: As to any Discount Mortgage Loan, a fraction (expressed
as a percentage) the numerator of which is the excess of the Required Coupon
over the Adjusted Net Mortgage Rate of such Discount Mortgage Loan and the
denominator of which is such Required Coupon. As to any Non-Discount Mortgage
Loan, 0%.

         Pool Stated Principal Balance: The aggregate Stated Principal Balance
of the Mortgage Loans.

         Prepayment Charge: As to a Mortgage Loan, any charge payable by a
Mortgagor in connection with certain partial prepayments and all prepayments in
full made within the related Prepayment Charge Period, the Prepayment Charges
with respect to each applicable Mortgage Loan so held by the Trust Fund being
identified in the Mortgage Loan Schedule.

         Prepayment Charge Period: As to any Mortgage Loan, the period of time
during which a Prepayment Charge may be imposed.

         Prepayment Interest Excess: As to any Principal Prepayment received by
the Servicer on a Mortgage Loan from the first day through the fifteenth day of
any calendar month other than the month of the Cut-off Date, all amounts paid by
the related Mortgagor in respect of interest on such Principal Prepayment. All
Prepayment Interest Excess shall be retained by the Servicer as additional
servicing compensation.

         Prepayment Interest Shortfall: As to any Distribution Date, Mortgage
Loan and Principal Prepayment received on or after the sixteenth day of the
month preceding the month of such Distribution Date (or, in the case of the
first Distribution Date, on or after the Cut-off Date) and on or before the last
day of the month preceding the month of such Distribution Date, the amount, if
any, by which one month's interest at the related Mortgage Rate, net of the
Servicing Fee Rate, on such Principal Prepayment exceeds the amount of interest
paid in connection with such Principal Prepayment.



                                       27
<PAGE>

         Prepayment Period: As to any Distribution Date and related Due Date,
the period from and including the 16th day of the month immediately prior to the
month of such Distribution Date (or, in the case of the first Distribution Date,
from the Cut-off Date) and to and including the 15th day of the month of such
Distribution Date.

         Primary Insurance Policy: Each policy of primary mortgage guaranty
insurance or any replacement policy therefor with respect to any Mortgage Loan.

         Principal Balance Schedule:   Not applicable.

          Principal Only Certificates:   As specified in the Preliminary
Statement.

         Principal Prepayment: Any payment of principal by a Mortgagor on a
Mortgage Loan (including the principal portion of the Purchase Price of any
Mortgage Loan purchased pursuant to Section 3.12) that is received in advance of
its scheduled Due Date and is not accompanied by an amount representing
scheduled interest due on any date in any month after the month of prepayment.
The Servicer shall apply partial Principal Prepayments in accordance with the
related Mortgage Note.

         Principal Prepayment in Full: Any Principal Prepayment made by a
Mortgagor of the entire principal balance of a Mortgage Loan.

         Private Certificates:   As specified in the Preliminary Statement.

         Pro Rata Share: As to any Distribution Date and any Class of
Subordinated Certificates, the portion of the Subordinated Principal
Distribution Amount allocable to such Class, equal to the product of the
Subordinated Principal Distribution Amount on such Distribution Date and a
fraction, the numerator of which is the related Class Certificate Balance
thereof and the denominator of which is the aggregate Class Certificate Balance
of the Subordinated Certificates, in each case immediately prior to such
Distribution Date.

         Proprietary Lease: For any Cooperative Unit, a lease or occupancy
agreement between a Cooperative Corporation and a holder of related Co-op
Shares.

         Prospectus Supplement: The Prospectus Supplement dated November 28,
2006, relating to the Offered Certificates, and any supplement thereto.

         PUD:   Planned Unit Development.

         Purchase Price: For any Mortgage Loan required to be purchased by the
Seller pursuant to Section 2.02 or 2.03 or purchased by the Servicer pursuant to
Section 3.12, the sum of

         (i) 100% of the unpaid principal balance of the Mortgage Loan on the
date of the purchase,

         (ii) accrued and unpaid interest on the Mortgage Loan at the applicable
Mortgage Rate (or at the applicable Adjusted Mortgage Rate if (x) the purchaser
is the Servicer or (y) if the purchaser is the Seller and the Seller is the
Servicer) from the date through which interest was last paid by the Mortgagor to
the Due Date in the month in which the Purchase Price is to be distributed to
Certificateholders, net of any unreimbursed Advances made by the Servicer on the
Mortgage Loan, and

         (iii) any costs and damages incurred by the Trust Fund in connection
with any violation by the Mortgage Loan of any predatory or abusive lending law.



                                       28
<PAGE>

         If the Mortgage Loan is purchased pursuant to Section 3.12, the
interest component of the Purchase Price shall be computed (i) on the basis of
the applicable Adjusted Mortgage Rate before giving effect to the related
modification and (ii) from the date to which interest was last paid to the date
on which the Mortgage Loan is assigned to the Servicer pursuant to Section 3.12.

         Qualified Insurer: A mortgage guaranty insurance company duly qualified
as such under the laws of the state of its principal place of business and each
state having jurisdiction over the insurer in connection with the insurance
policy issued by the insurer, duly authorized and licensed in such states to
transact a mortgage guaranty insurance business in such states and to write the
insurance provided by the insurance policy issued by it, approved as a FNMA- or
FHLMC-approved mortgage insurer or having a claims paying ability rating of at
least "AA" or equivalent rating by a nationally recognized statistical rating
organization. Any replacement insurer with respect to a Mortgage Loan must have
at least as high a claims paying ability rating as the insurer it replaces had
on the Closing Date.

         Rating Agency: Each of the Rating Agencies specified in the Preliminary
Statement. If any of them or a successor is no longer in existence, "Rating
Agency" shall be the nationally recognized statistical rating organization, or
other comparable Person, designated by the Depositor and named in the
Underwriters' Exemption, notice of which designation shall be given to the
Trustee. References to a given rating or rating category of a Rating Agency
means the rating category without giving effect to any modifiers.

         Realized Loss: With respect to each Liquidated Mortgage Loan, an amount
(not less than zero or more than the Stated Principal Balance of the Mortgage
Loan) as of the date of such liquidation, equal to (i) the Stated Principal
Balance of the Liquidated Mortgage Loan as of the date of such liquidation, plus
(ii) interest at the Adjusted Net Mortgage Rate from the Due Date as to which
interest was last paid or advanced (and not reimbursed) to Certificateholders up
to the Due Date in the month in which Liquidation Proceeds are required to be
distributed on the Stated Principal Balance of such Liquidated Mortgage Loan
from time to time, minus (iii) the Liquidation Proceeds, if any, received during
the month in which such liquidation occurred, to the extent applied as
recoveries of interest at the Adjusted Net Mortgage Rate and to principal of the
Liquidated Mortgage Loan. With respect to each Mortgage Loan that has become the
subject of a Deficient Valuation, if the principal amount due under the related
Mortgage Note has been reduced, the difference between the principal balance of
the Mortgage Loan outstanding immediately prior to such Deficient Valuation and
the principal balance of the Mortgage Loan as reduced by the Deficient
Valuation. With respect to each Mortgage Loan that has become the subject of a
Debt Service Reduction and any Distribution Date, the amount, if any, by which
the principal portion of the related Scheduled Payment has been reduced.

         To the extent the Servicer receives Subsequent Recoveries with respect
to any Mortgage Loan, the amount of the Realized Loss with respect to that
Mortgage Loan will be reduced by such Subsequent Recoveries.

         Recognition Agreement: For any Cooperative Loan, an agreement between
the Cooperative Corporation and the originator of the Mortgage Loan that
establishes the rights of the originator in the Cooperative Property.

         Record Date: With respect to any Distribution Date and any Definitive
Certificate and the Delay Certificates, the close of business on the last
Business Day of the month preceding the month of that Distribution Date. With
respect to any Distribution Date and the Non-Delay Certificates as long as they
are Book-Entry Certificates, the Business Day immediately prior to such
Distribution Date.

         Reference Bank:   As defined in Section 4.09.



                                       29
<PAGE>

         Refinance Loan: Any Mortgage Loan the proceeds of which are used to
refinance an Original Mortgage Loan.

         Regular Certificates:   As specified in the Preliminary Statement.

         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.

         Relief Act:   The Servicemembers Civil Relief Act.

         Relief Act Reductions: With respect to any Distribution Date and any
Mortgage Loan as to which there has been a reduction in the amount of interest
collectible thereon for the most recently ended calendar month as a result of
the application of the Relief Act or any similar state or local laws, the
amount, if any, by which (i) interest collectible on such Mortgage Loan for the
most recently ended calendar month is less than (ii) interest accrued thereon
for such month pursuant to the Mortgage Note.

         REMIC: A "real estate mortgage investment conduit" within the meaning
of section 860D of the Code.

          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 the Code, and related provisions, and
regulations promulgated thereunder, as the foregoing may be in effect from time
to time as well as provisions of applicable state laws.

         REO Property: A Mortgaged Property acquired by the Trust Fund through
foreclosure or deed-in-lieu of foreclosure in connection with a defaulted
Mortgage Loan.

         Reportable Event: Any event required to be reported on Form 8-K, and in
any event, the following:

         (a) entry into a definitive agreement related to the Trust Fund, the
Certificates or the Mortgage Loans, or an amendment to a Transaction Document,
even if the Depositor is not a party to such agreement (e.g., a servicing
agreement with a servicer contemplated by Item 1108(a)(3) of Regulation AB);

         (b) termination of a Transaction Document (other than by expiration of
the agreement on its stated termination date or as a result of all parties
completing their obligations under such agreement), even if the Depositor is not
a party to such agreement (e.g., a servicing agreement with a servicer
contemplated by Item 1108(a)(3) of Regulation AB);

         (c) with respect to the Servicer only, if the Servicer becomes aware of
any bankruptcy or receivership with respect to the Seller, the Depositor, the
Servicer, the Trustee, the Supplemental Interest Trustee, the Cap Counterparty,
any enhancement or support provider contemplated by Items 1114(b) or 1115 of
Regulation AB, or any other material party contemplated by Item 1101(d)(1) of
Regulation AB;

         (d) with respect to the Trustee, the Servicer and the Depositor only,
the occurrence of an early amortization, performance trigger or other event,
including an Event of Default under this Agreement;



                                       30
<PAGE>

         (e) any amendment to this Agreement;

         (f) the resignation, removal, replacement, substitution of the Servicer
or the Trustee;

         (g) with respect to the Servicer only, if the Servicer becomes aware
that (i) any material enhancement or support specified in Item 1114(a)(1)
through (3) of Regulation AB or Item 1115 of Regulation AB that was previously
applicable regarding one or more classes of the Certificates has terminated
other than by expiration of the contract on its stated termination date or as a
result of all parties completing their obligations under such agreement; (ii)
any material enhancement specified in Item 1114(a)(1) through (3) of Regulation
AB or Item 1115 of Regulation AB has been added with respect to one or more
Classes of the Certificates; or (iii) any existing material enhancement or
support specified in Item 1114(a)(1) through (3) of Regulation AB or Item 1115
of Regulation AB with respect to one or more Classes of the Certificates has
been materially amended or modified; and

         (h) with respect to the Trustee, the Servicer and the Depositor only, a
required distribution to Holders of the Certificates is not made as of the
required Distribution Date under this Agreement.

         Reporting Subcontractor: With respect to the Servicer or the Trustee,
any Subcontractor determined by such Person pursuant to Section 11.08(b) to be
"participating in the servicing function" within the meaning of Item 1122 of
Regulation AB. References to a Reporting Subcontractor shall refer only to the
Subcontractor of such Person and shall not refer to Subcontractors generally.

         Request for Release: The Request for Release submitted by the Servicer
to the Trustee, substantially in the form of Exhibits M and N, as appropriate.

         Required Coupon:   6.25% per annum.

         Required Insurance Policy: For any Mortgage Loan, any insurance policy
that is required to be maintained from time to time under this Agreement.

         Residual Certificates:   As specified in the Preliminary Statement.

         Responsible Officer: When used with respect to the Trustee, any
Managing Director, any Director, Vice President, any Assistant Vice President,
any Associate, any Assistant Secretary, any Trust Officer, or any other officer
of the Trustee customarily performing functions similar to those performed by
any of the above designated officers who at such time shall be officers to whom,
with respect to a particular matter, the matter is referred because of the
officer's knowledge of and familiarity with the particular subject and who has
direct responsibility for the administration of this Agreement.

         Restricted Classes:   As defined in Section 4.02(e).

         SAIF: The Savings Association Insurance Fund, or any successor thereto.

         Sarbanes-Oxley Certification:   As defined in Section 11.05.

         S&P: Standard & Poor's, a division of The McGraw-Hill Companies, Inc.
If S&P is designated as a Rating Agency in the Preliminary Statement, for
purposes of Section 10.05(b) the address for notices to S&P shall be Standard &
Poor's, a division of The McGraw-Hill Companies, Inc., 55 Water Street, New
York, New York 10041, Attention: Mortgage Surveillance Monitoring, or any other
address that S&P furnishes to the Depositor and the Servicer.



                                       31
<PAGE>

         Scheduled Balance:   Not applicable.

         Scheduled Classes:   As specified in the Preliminary Statement.

         Scheduled Payment: The scheduled monthly payment on a Mortgage Loan due
on any Due Date allocable to principal and/or interest on such Mortgage Loan
which, unless otherwise specified herein, shall give effect to any related Debt
Service Reduction and any Deficient Valuation that affects the amount of the
monthly payment due on such Mortgage Loan.

         Securities Act:   The Securities Act of 1933, as amended.

         Security Agreement: For any Cooperative Loan, the agreement between the
owner of the related Co-op Shares and the originator of the related Mortgage
Note that defines the security interest in the Co-op Shares and the related
Proprietary Lease.

         Seller: IndyMac Bank, F.S.B., a federal savings bank, and its
successors and assigns, in its capacity as seller of the Mortgage Loans to the
Depositor.

         Senior Certificate Group:   As specified in the Preliminary Statement.

         Senior Certificates:   As specified in the Preliminary Statement.

         Senior Credit Support Depletion Date: The date on which the Class
Certificate Balance of each Class of Subordinated Certificates has been reduced
to zero.

         Senior Percentage: As to any Distribution Date and Group, the
percentage equivalent of a fraction the numerator of which is the aggregate
Class Certificate Balance of the Senior Certificates in the related Group (other
than the related PO Component and the Notional Amount Certificates) immediately
before the Distribution Date and the denominator of which is (i) the aggregate
Class Certificate Balance of the Certificates (other than the related PO
Component) and (ii) the related Subordinated Portion Balance (other than the
Class PO Certificates and the Notional Amount Certificates) immediately before
the Distribution Date.

         Senior Prepayment Percentage: As to any Distribution Date and Group
during the five years beginning on the first Distribution Date, 100%. The Senior
Prepayment Percentage for any Distribution Date occurring on or after the fifth
anniversary of the first Distribution Date will, except as provided in this
Agreement, be as follows: for any Distribution Date in the first year
thereafter, the Senior Percentage plus 70% of the Subordinated Percentage for
such Distribution Date; for any Distribution Date in the second year thereafter,
the Senior Percentage plus 60% of the Subordinated Percentage for such
Distribution Date; for any Distribution Date in the third year thereafter, the
Senior Percentage plus 40% of the Subordinated Percentage for such Distribution
Date; for any Distribution Date in the fourth year thereafter, the Senior
Percentage plus 20% of the Subordinated Percentage for such Distribution Date;
and for any Distribution Date thereafter, the Senior Percentage for such
Distribution Date (unless on any Distribution Date the Senior Percentage exceeds
the initial Senior Percentage, in which case the Senior Prepayment Percentage
for such Distribution Date will once again equal 100%). Notwithstanding the
foregoing, no decrease in the Senior Prepayment Percentage will occur unless
both Senior Step Down Conditions are satisfied.

         Senior Principal Distribution Amount: As to any Distribution Date and
Group, the sum of (i) the related Senior Percentage of the Non-PO Percentage of
all amounts described in subclauses (a) through (d) of clause (i) of the
definition of Non-PO Formula Principal Amount for that Group for such



                                       32
<PAGE>

Distribution Date, (ii) for each Mortgage Loan that became a Liquidated Mortgage
Loan during the calendar month preceding the month of the Distribution Date, the
less of (x) the related Allocation Percentage of the Senior Percentage of the
applicable Non-PO Percentage of the Stated Principal Balance of the Mortgage
Loan, and (y) either (a) if no Excess Losses were sustained on a Liquidated
Mortgage Loan during the preceding calendar month, the related Allocation
Percentage of the applicable Non-PO Percentage of the amount of the liquidation
proceeds allocable to principal received on the Mortgage Loan or (b) if an
Excess Loss were sustained on the Liquidated Mortgage Loan during the preceding
calendar month, the related Allocation Percentage of the Senior Percentage of
the applicable Non-PO Percentage of the amount of the liquidation proceeds
allocable to principal received on the Mortgage Loan, and (iii) the Senior
Prepayment Percentage of the applicable Non-PO Percentage of the amounts
described in subclause (f) of clause (i) of the definition of Non-PO Formula
Principal Amount for that Group for such Distribution Date, and (iv) the Senior
Prepayment Percentage of any Subsequent Recoveries described in clause (ii) of
the definition of Non-PO Formula Principal Amount for that Group for such
Distribution Date; provided, however, that if a Bankruptcy Loss that is an
Excess Loss is sustained with respect to a Mortgage Loan that is not a
Liquidated Mortgage Loan, the Senior Principal Distribution Amount will be
reduced on the related Distribution Date by the related Allocation Percentage of
the Senior Percentage of the applicable Non-PO Percentage of the principal
portion of such Bankruptcy Loss.

          Senior Step Down Conditions: As to any Distribution Date: (i) the
aggregate Stated Principal Balance of all Mortgage Loans 60 days or more
Delinquent (averaged over the preceding six month period) (including any
Mortgage Loans subject to foreclosure proceedings, REO Property (regardless of
whether that Mortgage Loan is 60 days or more Delinquent) and Mortgage Loans the
mortgagors of which are in bankruptcy), as a percentage of the aggregate Class
Certificate Balance of the Subordinated Certificates, does not equal or exceed
50%, and (ii) cumulative Realized Losses do not exceed: (a) commencing with the
Distribution Date on the fifth anniversary of the first Distribution Date, 30%
of the Original Subordinated Principal Balance, (b) commencing with the
Distribution Date on the sixth anniversary of the first Distribution Date, 35%
of the Original Subordinated Principal Balance, (c) commencing with the
Distribution Date on the seventh anniversary of the first Distribution Date, 40%
of the Original Subordinated Principal Balance, (d) commencing with the
Distribution Date on the eighth anniversary of the first Distribution Date, 45%
of the Original Subordinated Principal Balance, and (e) commencing with the
Distribution Date on the ninth anniversary of the first Distribution Date, 50%
of the Original Subordinated Principal Balance

         Senior Termination Date:   Not applicable.

         Servicer: IndyMac Bank, F.S.B., a federal savings bank, and its
successors and assigns, in its capacity as Servicer under this Agreement.

         Servicer Advance Date: As to any Distribution Date, 12:30 P.M. Pacific
time on the Business Day preceding the Distribution Date.

         Servicing Advances: All customary, reasonable, and necessary "out of
pocket" costs and expenses incurred in the performance by the Servicer of its
servicing obligations, including the cost of

                  (a) the preservation, restoration, and protection of a
         Mortgaged Property,

                  (b) expenses reimbursable to the Servicer pursuant to Section
         3.12 and any enforcement or judicial proceedings, including
         foreclosures,

                  (c) the maintenance and liquidation of any REO Property,



                                       33
<PAGE>

                   (d) compliance with the obligations under Section 3.10; and

                  (e) reasonable compensation to the Servicer or its affiliates
         for acting as broker in connection with the sale of foreclosed
         Mortgaged Properties and for performing certain default management and
         other similar services (including appraisal services) in connection
         with the servicing of defaulted Mortgage Loans. For purposes of this
         clause (e), only costs and expenses incurred in connection with the
         performance of activities generally considered to be outside the scope
         of customary servicing duties shall be treated as Servicing Advances.

         Servicing Criteria: The "servicing criteria" set forth in Item 1122(d)
of Regulation AB.

         Servicing Fee: As to each Mortgage Loan and any Distribution Date, one
month's interest at the applicable Servicing Fee Rate on the Stated Principal
Balance of the Mortgage Loan, or, whenever a payment of interest accompanies a
Principal Prepayment in Full made by the Mortgagor, interest at the Servicing
Fee Rate on the Stated Principal Balance of the Mortgage Loan for the period
covered by the payment of interest, subject to reduction as provided in Section
3.15.

         Servicing Fee Rate: For each Mortgage Loan, the per annum rate
specified on the Mortgage Loan Schedule.

         Servicing Officer: Any officer of the Servicer involved in, or
responsible for, the administration and servicing of the Mortgage Loans whose
name and facsimile signature appear on a list of servicing officers furnished to
the Trustee by the Servicer on the Closing Date pursuant to this Agreement, as
the list may from time to time be amended.

         Servicing Standard: That degree of skill and care exercised by the
Servicer with respect to mortgage loans comparable to the Mortgage Loans
serviced by the Servicer for itself or others.

         Shift Percentage: For any Distribution Date occurring during the five
years beginning on the first Distribution Date, 0%. Thereafter, the Shift
Percentage for any Distribution Date occurring on or after the fifth anniversary
of the first Distribution Date will be as follows: for any Distribution Date in
the first year thereafter, 30%; for any Distribution Date in the second year
thereafter, 40%; for any Distribution Date in the third year thereafter, 60%;
for any Distribution Date in the fourth year thereafter, 80%; and for any
Distribution Date thereafter, 100%.

         Special Hazard Coverage Termination Date: The point in time at which
the Special Hazard Loss Coverage Amount is reduced to zero.

         Special Hazard Loss: Any Realized Loss suffered by a Mortgaged Property
on account of direct physical loss, but not including (i) any loss of a type
covered by a hazard insurance policy or a flood insurance policy required to be
maintained with respect to such Mortgaged Property pursuant to Section 3.10 to
the extent of the amount of such loss covered thereby, or (ii) any loss caused
by or resulting from:

                  (a) normal wear and tear;

                  (b) fraud, conversion or other dishonest act on the part of
         the Trustee, the Servicer or any of their agents or employees (without
         regard to any portion of the loss not covered by any errors and
         omissions policy);

                  (c) errors in design, faulty workmanship or faulty materials,
         unless the collapse of the property or a part thereof ensues and then
         only for the ensuing loss;



                                        34
<PAGE>

                  (d) nuclear or chemical reaction or nuclear radiation or
         radioactive or chemical contamination, all whether controlled or
         uncontrolled, and whether such loss be direct or indirect, proximate or
         remote or be in whole or in part caused by, contributed to or
         aggravated by a peril covered by the definition of the term "Special
         Hazard Loss";

                  (e) hostile or warlike action in time of peace and war,
         including action in hindering, combating or defending against an
         actual, impending or expected attack:

                           1. by any government or sovereign power, de jure or
                  de facto, or by any authority maintaining or using military,
                  naval or air forces; or

                           2. by military, naval or air forces; or

                           3. by an agent of any such government, power,
                  authority or forces;

                  (f) any weapon of war employing nuclear fission, fusion or
         other radioactive force, whether in time of peace or war; or

                  (g) insurrection, rebellion, revolution, civil war, usurped
         power or action taken by governmental authority in hindering, combating
         or defending against such an occurrence, seizure or destruction under
         quarantine or customs regulations, confiscation by order of any
         government or public authority, or risks of contraband or illegal
         transportation or trade.

         Special Hazard Loss Coverage Amount: With respect to the first
Distribution Date, $5,894,000. With respect to any Distribution Date after the
first Distribution Date, the lesser of (a) the greatest of (i) 1% of the
aggregate of the principal balances of the Mortgage Loans, (ii) twice the
principal balance of the largest Mortgage Loan and (iii) the aggregate of the
principal balances of all Mortgage Loans secured by Mortgaged Properties located
in the single California postal zip code area having the highest aggregate
principal balance of any such zip code area and (b) the Special Hazard Loss
Coverage Amount as of the Closing Date less the amount, if any, of Special
Hazard Losses allocated to the Certificates since the Closing Date. All
principal balances for the purpose of this definition will be calculated as of
the first day of the calendar month preceding the month of such Distribution
Date after giving effect to Scheduled Payments on the Mortgage Loans then due,
whether or not paid.

         Special Hazard Mortgage Loan: A Liquidated Mortgage Loan as to which a
Special Hazard Loss has occurred.

         Startup Day:   The Closing Date.

         Stated Principal Balance: As to any Mortgage Loan and Due Date, the
unpaid principal balance of such Mortgage Loan as of such Due Date, as specified
in the amortization schedule at the time relating thereto (before any adjustment
to such amortization schedule by reason of any moratorium or similar waiver or
grace period) after giving effect to the sum of: (i) the payment of principal
due on such Due Date and irrespective of any delinquency in payment by the
related Mortgagor and (ii) any Liquidation Proceeds allocable to principal
received in the prior calendar month and Principal Prepayments received through
the last day of the Prepayment Period in which the Due Date occurs, in each case
with respect to such Mortgage Loan.

         Subcontractor: Any vendor, subcontractor or other Person that is not
responsible for the overall servicing (as "servicing" is commonly understood by
participants in the mortgage-backed securities market) of Mortgage Loans but
performs one or more discrete functions identified in Item 1122(d) of



                                        35
<PAGE>

Regulation AB with respect to the Mortgage Loans under the direction or
authority of the Servicer or the Trustee, as the case may be.

         Subordinated Certificates:   As specified in the Preliminary Statement.

         Subordinated Percentage: As to any Distribution Date and each
Subordinated Percentage, 100% minus the Senior Percentage for that Group for
such Distribution Date.

         Subordinated Portion: The Group 1A Subordinated Portion and Group 1B
Subordinated Portion, as applicable.

         Subordinated Portion Balance: For any Distribution Date is the initial
balance of the related Subordinated Portion reduced by all amounts applied and
losses allocated in reduction of the Subordinated Portion Balance and increased
by the applicable Allocation Percentage of Subsequent Recoveries on the Mortgage
Loans.

         Subordinated Prepayment Percentage: As to any Distribution Date and
Group, 100% minus the Senior Prepayment Percentage for such Distribution Date.

         Subordinated Principal Distribution Amount: As to any Distribution Date
and Group, the sum of the following: (i) the related Allocation Percentage of
the Subordinated Percentage of the applicable Non-PO Percentage of all amounts
described in subclauses (a) through (d) of clause (i) of the definition of
Non-PO Formula Principal Amount with respect to such Distribution Date, (ii) for
each Mortgage Loan that became a Liquidated Mortgage Loan during the calendar
month preceding the month of the Distribution Date, the related Allocation
Percentage of the applicable Non-PO Percentage of the portion of the Liquidation
Proceeds allocable to principal received on the Mortgage Loan, after application
of the amounts pursuant to clause (ii) of the definition of Senior Principal
Distribution Amount, up to the related Allocation Percentage of the Subordinated
Percentage of the applicable Non-PO Percentage of the Stated Principal Balance
of the Mortgage Loan, and (iii) the related Allocation Percentage of the
Subordinated Prepayment Percentage of the applicable Non-PO Percentage of the
amounts described in subclause (f) of clause (i) and in clause (ii) of the
definition of Non-PO Formula Principal Amount for that Group with respect to
such Distribution Date, reduced by the amount of any payments in respect of
Class PO Deferred Amounts for that Group for such Distribution Date.

         Subsequent Recoveries: As to any Distribution Date, with respect to a
Liquidated Mortgage Loan that resulted in a Realized Loss in a prior calendar
month, unexpected amounts received by the Servicer (net of any related expenses
permitted to be reimbursed pursuant to Section 3.09) specifically related to
such Liquidated Mortgage Loan.

         Substitute Mortgage Loan: A Mortgage Loan substituted by the Seller for
a Deleted Mortgage Loan that must, on the date of substitution, as confirmed in
a Request for Release, substantially in the form of Exhibit M,

         (i) have a Stated Principal Balance, after deduction of the principal
portion of the Scheduled Payment due in the month of substitution, not in excess
of, and not more than 10% less than, the Stated Principal Balance of the Deleted
Mortgage Loan (unless the amount of any shortfall is deposited by the Seller in
the Certificate Account and held for distribution to the Certificateholders on
the related Distribution Date);

         (ii) have a Mortgage Rate no lower than and not more than 1% per annum
higher than the Deleted Mortgage Loan;



                                       36
<PAGE>

         (iii) have a Loan-to-Value Ratio no higher than that of the Deleted
Mortgage Loan;

         (iv) have a remaining term to maturity no greater than (and not more
than one year less than) that of the Deleted Mortgage Loan;

         (v) not be a Cooperative Loan unless the Deleted Mortgage Loan was a
Cooperative Loan; and

         (vi) comply with each representation and warranty in Section 2.03.

         Substitution Adjustment Amount:   As defined in Section 2.03.

         Supplemental Interest Reserve Fund: The separate fund created and
initially maintained by the Supplemental Interest Trustee pursuant to Section
3.06 in the name of the Supplemental Interest Trustee for the benefit of the
Holders of the Class A-10 Certificates and designated "Deutsche Bank National
Trust Company in trust for registered holders of Residential Asset
Securitization Trust 2006-A15, Mortgage Pass-Through Certificates, Series
2006-O, Class A-10." Funds in the Supplemental Interest Reserve Fund shall be
held in trust for the Holders of the Class A-10 Certificates for the uses and
purposes set forth in this Agreement. The Supplemental Interest Reserve Fund
will not be an asset of any REMIC.

         Supplemental Interest Trust: The separate trust created under this
Agreement pursuant to Section 3.06(g).

         Supplemental Interest Trustee: Deutsche Bank National Trust Company,
not in its individual capacity, but solely in its capacity as trustee of the
Supplemental Interest Trust for the benefit of the Holders of the Class A-10
Certificates under this Agreement, and any successor thereto, and any
corporation or national banking association resulting from or surviving any
consolidation or merger to which it or its successors may be a party and any
successor trustee as may from time to time be serving as successor trustee
hereunder.

         Suspension Notification: Notification to the Commission of the
suspension of the Trust Fund's obligation to file reports pursuant to Section
15(d) of the Exchange Act.

         Targeted Balance: Not applicable.

         Targeted Principal Classes:   As specified in the Preliminary Statement.

         Termination Date:   The Distribution Date in July 2009.

         Transaction Documents: This Agreement, the Corridor Contract and any
other document or agreement entered into in connection with the Trust Fund, the
Certificates or the Mortgage Loans.

         Transfer: Any direct or indirect transfer or sale of any Ownership
Interest in a Residual Certificate.

         Transfer Payment Made:   Not applicable.

         Transfer Payment Received:   Not applicable.

         Trust Fund:   The corpus of the trust created under this Agreement
consisting of



                                       37
<PAGE>

         (i) the Mortgage Loans and all interest and principal received on them
after the Cut-off Date, other than amounts due on the Mortgage Loans by the
Cut-off Date;

         (ii) the Certificate Account, the Distribution Account and all amounts
deposited therein pursuant to this Agreement (including amounts received from
the Seller on the Closing Date that will be deposited by the Trustee in the
Certificate Account pursuant to Section 2.01);

         (iii) property that secured a Mortgage Loan and has been acquired by
foreclosure, deed-in-lieu of foreclosure, or otherwise;

         (iv) the right to collect any amounts under any mortgage insurance
policies covering any Mortgage Loan and any collections received under any
mortgage insurance policies covering any Mortgage Loan;

          (v) all rights to receive amounts under, and to enforce remedies in,
the Corridor Contract; and

         (vi) all proceeds of the conversion, voluntary or involuntary, of any
of the foregoing.

         Trustee: Deutsche Bank National Trust Company and its successors and,
if a successor trustee is appointed under this Agreement, the successor.

         Trustee Fee: The fee payable to the Trustee on each Distribution Date
for its services as Trustee hereunder, in an amount equal to one-twelfth of the
Trustee Fee Rate multiplied by the aggregate Stated Principal Balance of the
Mortgage Loans immediately prior to such Distribution Date.

         Trustee Fee Rate:   0.0075% per annum.

         The terms "United States," "State," and "International Organization"
have the meanings in section 7701 of the Code or successor provisions. A
corporation will not be treated as an instrumentality of the United States or of
any State or political subdivision thereof for these purposes if all of its
activities are subject to tax and, with the exception of the Federal Home Loan
Mortgage Corporation, a majority of its board of directors is not selected by
such government unit.

         UCC:   The Uniform Commercial Code for the State of New York.

         Undercollateralized Group:   Not applicable.

         Underwriter's Exemption: Prohibited Transaction Exemption 2002-41, 67
Fed. Reg. 54487 (2002) (or any successor thereto), or any substantially similar
administrative exemption granted by the U.S. Department of Labor.

         United States Person or U.S. Person:

         (i) A citizen or resident of the United States;

         (ii) a corporation (or entity treated as a corporation for tax
purposes) created or organized in the United States or under the laws of the
United States or of any state thereof, including, for this purpose, the District
of Columbia;



                                       38
<PAGE>

         (iii) a partnership (or entity treated as a partnership for tax
purposes) organized in the United States or under the laws of the United States
or of any state thereof, including, for this purpose, the District of Columbia
(unless provided otherwise by future Treasury regulations);

         (iv) an estate whose income is includible in gross income for United
States income tax purposes regardless of its source; or

         (v) a trust, if a court within the United States is able to exercise
primary supervision over the administration of the trust and one or more U.S.
Persons have authority to control all substantial decisions of the trust.
Notwithstanding the last clause of the preceding sentence, to the extent
provided in Treasury regulations, certain trusts in existence on August 20,
1996, and treated as U.S. Persons before that date, may elect to continue to be
U.S. Persons.

         U.S.A. Patriot Act: The Uniting and Strengthening America by Providing
Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001.

         Voting Rights: The portion of the voting rights of all of the
Certificates that is allocated to any Certificate. As of any date of
determination, (a) 1% of all Voting Rights shall be allocated to each Class of
Notional Amount Certificates (the Voting Rights to be allocated among the
holders of Certificates of each Class in accordance with their respective
Percentage Interests), (b) 1% of all Voting Rights shall be allocated to the
Holder of the Class A-R Certificates and (c) the remaining Voting Rights shall
be allocated among Holders of the remaining Classes of Offered Certificates in
proportion to the Certificate Balances of the respective Certificates on the
date.

         Withdrawal Date: The 18th day of each month, or if such day is not a
Business Day, the next preceding Business Day.

         Yield Supplement Amount: For the Class A-10 Certificates and any
Distribution Date, the product of (i) the excess of (A) the lesser of (x) LIBOR
(as determined by the Cap Counterparty) and (y) 8.90% over (B) 5.65%, (ii) the
Class Certificate Balance of the Class A-10 Certificates immediately prior to
that Distribution Date, and (iii) a fraction, the numerator of which is 30, and
the denominator of is 360.

Section 1.02       Rules of Construction.

         Except as otherwise expressly provided in this Agreement or unless the
context clearly requires otherwise

                  (a) References to designated articles, sections, subsections,
         exhibits, and other subdivisions of this Agreement, such as "Section
         6.12 (a)," refer to the designated article, section, subsection,
         exhibit, or other subdivision of this Agreement as a whole and to all
         subdivisions of the designated article, section, subsection, exhibit,
         or other subdivision. The words "herein," "hereof," "hereto,"
         "hereunder," and other words of similar import refer to this Agreement
         as a whole and not to any particular article, section, exhibit, or
         other subdivision of this Agreement.

                  (b) Any term that relates to a document or a statute, rule, or
         regulation includes any amendments, modifications, supplements, or any
         other changes that may have occurred since the document, statute, rule,
         or regulation came into being, including changes that occur after the
          date of this Agreement.



                                       39
<PAGE>

                  (c) Any party may execute any of the requirements under this
         Agreement either directly or through others, and the right to cause
         something to be done rather than doing it directly shall be implicit in
         every requirement under this Agreement. Unless a provision is
         restricted as to time or limited as to frequency, all provisions under
         this Agreement are implicitly available and things may happen from time
         to time.

                  (d) The term "including" and all its variations mean
         "including but not limited to." Except when used in conjunction with
         the word "either," the word "or" is always used inclusively (for
         example, the phrase "A or B" means "A or B or both," not "either A or B
         but not both").

                  (e) A reference to "a [thing]" or "any [of a thing]" does not
         imply the existence or occurrence of the thing referred to even though
         not followed by "if any," and "any [of a thing]" is any of it. A
         reference to the plural of anything as to which there could be either
         one or more than one does not imply the existence of more than one (for
         instance, the phrase "the obligors on a note" means "the obligor or
         obligors on a note"). "Until [something occurs]" does not imply that it
         must occur, and will not be modified by the word "unless." The word
          "due" and the word "payable" are each used in the sense that the stated
         time for payment has passed. The word "accrued" is used in its
         accounting sense, i.e., an amount paid is no longer accrued. In the
         calculation of amounts of things, differences and sums may generally
         result in negative numbers, but when the calculation of the excess of
         one thing over another results in zero or a negative number, the
         calculation is disregarded and an "excess" does not exist. Portions of
         things may be expressed as fractions or percentages interchangeably.

                  (f) All accounting terms used in an accounting context and not
         otherwise defined, and accounting terms partly defined in this
          Agreement, to the extent not completely defined, shall be construed in
         accordance with generally accepted accounting principles. To the extent
         that the definitions of accounting terms in this Agreement are
         inconsistent with their meanings under generally accepted accounting
         principles, the definitions contained in this Agreement shall control.
         Capitalized terms used in this Agreement without definition that are
         defined in the Uniform Commercial Code are used in this Agreement as
         defined in the Uniform Commercial Code.

                  (g) In the computation of a period of time from a specified
         date to a later specified date or an open-ended period, the words
         "from" and "beginning" mean "from and including," the word "after"
         means "from but excluding," the words "to" and "until" mean "to but
         excluding," and the word "through" means "to and including." Likewise,
         in setting deadlines or other periods, "by" means "by." The words
         "preceding," "following," and words of similar import, mean immediately
         preceding or following. References to a month or a year refer to
         calendar months and calendar years.

                  (h) Any reference to the enforceability of any agreement
         against a party means that it is enforceable, subject as to enforcement
         against the party, to applicable bankruptcy, insolvency,
         reorganization, and other similar laws of general applicability
         relating to or affecting creditors' rights and to general equity
         principles.



                                       40
<PAGE>


                                  ARTICLE TWO

          CONVEYANCE OF MORTGAGE LOANS; REPRESENTATIONS AND WARRANTIES

         Section 2.01 Conveyance of Mortgage Loans.

         (a) The Seller, concurrently with the execution and delivery of this
Agreement, hereby transfers to the Depositor, without recourse, all the interest
of the Seller in each Mortgage Loan, including all interest and principal
received or receivable by the Seller on each Mortgage Loan after the Cut-off
Date and all interest and principal payments on each Mortgage Loan received
before the Cut-off Date for installments of interest and principal due after the
Cut-off Date but not including payments of principal and interest due by the
Cut-off Date. By the Closing Date, the Seller shall deliver to the Depositor or,
at the Depositor's direction, to the Trustee or other designee of the Depositor,
the Mortgage File for each Mortgage Loan listed in the Mortgage Loan Schedule
(except that, in the case of Mortgage Loans that are Delay Delivery Mortgage
Loans, such delivery may take place within five Business Days of the Closing
Date) as of the Closing Date. The delivery of the Mortgage Files shall be made
against payment by the Depositor of the purchase price, previously agreed to by
the Seller and Depositor, for the Mortgage Loans. With respect to any Mortgage
Loan that does not have a first payment date on or before the Due Date in the
month of the first Distribution Date, the Seller shall deposit into the
Distribution Account on the first Distribution Account Deposit Date an amount
equal to one month's interest at the related Adjusted Mortgage Rate on the
Cut-off Date Principal Balance of such Mortgage Loan. Also on the Closing Date
the Depositor shall deposit $100 into the Certificate Account.

         (b) The Depositor, concurrently with the execution and delivery of this
Agreement, hereby transfers to the Trustee for the benefit of the
Certificateholders, without recourse, all the interest of the Depositor in the
Trust Fund, together with the Depositor's right to require the Seller to cure
any breach of a representation or warranty made in this Agreement by the Seller
or to repurchase or substitute for any affected Mortgage Loan in accordance with
this Agreement. The Depositor hereby directs the Trustee to execute the Corridor
Contract.

         (c) In connection with the transfer and assignment of each Mortgage
Loan, the Depositor has delivered (or, in the case of the Delay Delivery
Mortgage Loans, will deliver to the Trustee within the time periods specified in
the definition of Delay Delivery Mortgage Loans), for the benefit of the
Certificateholders the following documents or instruments with respect to each
Mortgage Loan so assigned:

                  (i) The original Mortgage Note, endorsed by manual or
         facsimile signature in blank in the following form: "Pay to the order
         of _______________ ______________without recourse," with all
         intervening endorsements showing a complete chain of endorsement from
         the originator to the Person endorsing the Mortgage Note (each
         endorsement being sufficient to transfer all interest of the party so
         endorsing, as noteholder or assignee thereof, in that Mortgage Note) or
         a lost note affidavit for any Lost Mortgage Note from the Seller
         stating that the original Mortgage Note was lost or destroyed, together
         with a copy of the Mortgage Note;

                  (ii) Except as provided below and for each Mortgage Loan that
         is not a MERS Mortgage Loan, the original recorded Mortgage or a copy
         of such Mortgage certified by the Seller as being a true and complete
         copy of the Mortgage (or, in the case of a Mortgage for which the
         related Mortgaged Property is located in the Commonwealth of Puerto
         Rico, a true copy of the Mortgage certified as such by the applicable
         notary) and in the case of each MERS Mortgage Loan, the original
         Mortgage, noting the presence of the MIN of the Mortgage Loan and
         either language indicating that the Mortgage Loan is a MOM Loan if the
         Mortgage Loan is a MOM



                                       41
<PAGE>


         Loan or if the Mortgage Loan was not a MOM Loan at origination, the
         original Mortgage and the assignment thereof to MERS, with evidence of
         recording indicated thereon, or a copy of the Mortgage certified by the
         public recording office in which such Mortgage has been recorded;

                  (iii) in the case of each Mortgage Loan that is not a MERS
         Mortgage Loan, a duly executed assignment of the Mortgage (which may be
         included in a blanket assignment or assignments), together with, except
         as provided below, all interim recorded assignments of the mortgage
         (each assignment, when duly and validly completed, to be in recordable
         form and sufficient to effect the assignment of and transfer to its
         assignee of the Mortgage to which the assignment relates). If the
         related Mortgage has not been returned from the applicable public
         recording office, the assignment of the Mortgage may exclude the
         information to be provided by the recording office. The assignment of
         Mortgage need not be delivered in the case of a Mortgage for which the
         related Mortgage Property is located in the Commonwealth of Puerto
         Rico;

                  (iv) The original or copies of each assumption, modification,
         written assurance, or substitution agreement;

                  (v) Except as provided below, the original or duplicate
         original lender's title policy and all its riders;

                  (vi) The originals of the following documents for each
         Cooperative Loan:

                           (A)       the Co-op Shares, together with a stock
                                    power in blank;

                           (B)       the executed Security Agreement;

                           (C)       the executed Proprietary Lease;

                           (D)       the executed Recognition Agreement;

                           (E)       the executed UCC-1 financing statement that
                                    has been filed in all places required to
                                    perfect the Seller's interest in the Co-op
                                     Shares and the Proprietary Lease with
                                    evidence of recording on it; and

                           (F)       executed UCC-3 financing statements or other
                                     appropriate UCC financing statements
                                    required by state law, evidencing a complete
                                    and unbroken line from the mortgagee to the
                                    Trustee with evidence of recording thereon
                                    (or in a form suitable for recordation). If
                                    in connection with any Mortgage Loan the
                                    Depositor cannot deliver

                                     (a) the original recorded Mortgage,

                                    (b) all interim recorded assignments, or

                                    (c) the lender's title policy (together with
                                         all its riders).

         In addition, in connection with the assignment of any MERS Mortgage
Loan, the Seller agrees that it will cause, at the Seller's expense, the MERS(R)
System to indicate that the Mortgage Loans sold by the Seller to the Depositor
have been assigned by the Seller to the Trustee in accordance with this
Agreement for the benefit of the Certificateholders by including (or deleting,
in the case of Mortgage



                                       42
<PAGE>

Loans that are repurchased in accordance with this Agreement) in such computer
files the information required by the MERS(R) System to identify the series of
the Certificates issued in connection with such Mortgage Loans. The Seller
further agrees that it will not, and will not permit the Servicer to, and the
Servicer agrees that it will not, alter the information referenced in this
paragraph with respect to any Mortgage Loan sold by the Seller to the Depositor
during the term of this Agreement unless and until such Mortgage Loan is
repurchased in accordance with the terms of this Agreement.

         In the event that in connection with any Mortgage Loan that is not a
MERS Mortgage Loan the Depositor cannot deliver (a) the original recorded
Mortgage, (b) all interim recorded assignments or (c) the lender's title policy
(together with all riders thereto) satisfying the requirements of clause (ii),
(iii) or (v) above, respectively, concurrently with the execution and delivery
of this Agreement because such document or documents have not been returned from
the applicable public recording office in the case of clause (ii) or (iii)
above, or because the title policy has not been delivered to either the Servicer
or the Depositor by the applicable title insurer in the case of clause (v)
above, then the Depositor shall promptly deliver to the Trustee, in the case of
clause (ii) or (iii) above, the original Mortgage or the interim assignment, as
the case may be, with evidence of recording indicated on when it is received
from the public recording office, or a copy of it, certified, if appropriate, by
the relevant recording office and in the case of clause (v) above, the original
or a copy of a written commitment or interim binder or preliminary report of
title issued by the title insurance or escrow company, with the original or
duplicate copy thereof to be delivered to the Trustee upon receipt thereof. The
delivery of the original Mortgage Loan and each interim assignment or a copy of
them, certified, if appropriate, by the relevant recording office, shall not be
made later than one year following the Closing Date, or, in the case of clause
(v) above, later than 120 days following the Closing Date. If the Depositor is
unable to deliver each Mortgage by that date and each interim assignment because
any documents have not been returned by the appropriate recording office, or, in
the case of each interim assignment, because the related Mortgage has not been
returned by the appropriate recording office, the Depositor shall deliver the
documents to the Trustee as promptly as possible upon their receipt and, in any
event, within 720 days following the Closing Date.

         The Depositor shall forward to the Trustee (a) from time to time
additional original documents evidencing an assumption or modification of a
Mortgage Loan and (b) any other documents required to be delivered by the
Depositor or the Servicer to the Trustee. If the original Mortgage is not
delivered and in connection with the payment in full of the related Mortgage
Loan the public recording office requires the presentation of a "lost
instruments affidavit and indemnity" or any equivalent document, because only a
copy of the Mortgage can be delivered with the instrument of satisfaction or
reconveyance, the Servicer shall execute and deliver the required document to
the public recording office. If a public recording office retains the original
recorded Mortgage or if a Mortgage is lost after recordation in a public
recording office, the Seller shall deliver to the Trustee a copy of the Mortgage
certified by the public recording office to be a true and complete copy of the
original recorded Mortgage.

         As promptly as practicable after any transfer of a Mortgage Loan under
this Agreement, and in any event within thirty days after the transfer, the
Trustee shall (i) affix the Trustee's name to each assignment of Mortgage, as
its assignee, and (ii) cause to be delivered for recording in the appropriate
public office for real property records the assignments of the Mortgages to the
Trustee, except that, if the Trustee has not received the information required
to deliver any assignment of a Mortgage for recording, the Trustee shall deliver
it as soon as practicable after receipt of the needed information and in any
event within thirty days.

         The Trustee need not record any assignment that relates to a Mortgage
Loan (a) the Mortgaged Property and Mortgage File relating to which are located
in California or (b) in any other jurisdiction (including Puerto Rico) under the
laws of which, as evidenced by an Opinion of Counsel delivered by the Seller (at
the Seller's expense) to the Trustee, recording the assignment is not necessary
to protect the



                                       43
<PAGE>

Trustee's and the Certificateholders' interest in the related Mortgage Loan. The
Seller shall deliver such Opinion of Counsel within 90 days of the Closing Date.

         If any Mortgage Loans have been prepaid in full as of the Closing Date,
the Depositor, in lieu of delivering the above documents to the Trustee, will
deposit in the Certificate Account the portion of the prepayment that is
required to be deposited in the Certificate Account pursuant to Section 3.06.

         Notwithstanding anything to the contrary in this Agreement, within five
Business Days after the Closing Date, the Seller shall either

                  (x) deliver to the Trustee the Mortgage File as required
                  pursuant to this Section 2.01 for each Delay Delivery Mortgage
                  Loan or

                   (y) (A) repurchase the Delay Delivery Mortgage Loan or (B)
                  substitute the Substitute Mortgage Loan for a Delay Delivery
                  Mortgage Loan, which repurchase or substitution shall be
                  accomplished in the manner and subject to the conditions in
                  Section 2.03 (treating each such Delay Delivery Mortgage Loan
                  as a Deleted Mortgage Loan for purposes of such Section 2.03);

provided, however, that if the Seller fails to deliver a Mortgage File for any
Delay Delivery Mortgage Loan within the period specified herein, the Seller
shall use its best reasonable efforts to effect a substitution, rather than a
repurchase of, such Deleted Mortgage Loan and provided further that the cure
period provided for in Section 2.02 or in Section 2.03 shall not apply to the
initial delivery of the Mortgage File for such Delay Delivery Mortgage Loan, but
rather the Seller shall have five (5) Business Days to cure such failure to
deliver. At the end of such period, the Trustee shall send a Delay Delivery
Certification for the Delay Delivery Mortgage Loans delivered during such period
in accordance with the provisions of Section 2.02.

         (d) The Seller agrees to treat the transfer of the Mortgage Loans to
the Depositor as a sale for all tax, accounting, and regulatory purposes.

         (e) The Depositor and the Trustee hereto agree and understand that it
is not intended that any Mortgage Loan be included in the Trust Fund that is (i)
a "High-Cost Home Loan" as defined in the New Jersey Ownership Act effective
November 27, 2003, (ii) a "High-Cost Home Loan" as defined in the New Mexico
Home Loan Protection Act effective January 1, 2004, (iii) a "High-Cost Home
Loan" as defined in the Massachusetts Predatory Home Loan Practices Act or (iv)
a "High-Cost Home Loan" as defined by the Indiana High Cost Home Loan Law
effective January 1, 2005.



         Section 2.02 Acceptance by the Trustee of the Mortgage Loans.

         The Trustee acknowledges receipt of the documents identified in the
Initial Certification in the form of Exhibit G-1, and declares that it holds and
will hold such documents and the other documents delivered to it constituting
the Mortgage Files for the Mortgage Loans, and that it holds or will hold such
other assets as are included in the Trust Fund, in trust for the exclusive use
and benefit of all present and future Certificateholders.

         The Trustee acknowledges that it will maintain possession of the
related Mortgage Notes in the State of California, unless otherwise permitted by
the Rating Agencies. The Trustee agrees to execute and deliver on the Closing
Date to the Depositor, the Servicer and the Seller an Initial Certification in
the



                                        44
<PAGE>

form of Exhibit G-1. Based on its review and examination, and only as to the
documents identified in such Initial Certification, the Trustee acknowledges
that such documents appear regular on their face and relate to such Mortgage
Loans. The Trustee shall be under no duty or obligation to inspect, review or
examine said documents, instruments, certificates or other papers to determine
that the same are genuine, enforceable or appropriate for the represented
purpose or that they have actually been recorded in the real estate records or
that they are other than what they purport to be on their face.

         By the thirtieth day after the Closing Date (or if that day is not a
Business Day, the succeeding Business Day), the Trustee shall deliver to the
Depositor, the Servicer, and the Seller a Delay Delivery Certification with
respect to the Mortgage Loans substantially in the form of Exhibit G-2, with any
applicable exceptions noted thereon.

         By the ninetieth day after the Closing Date (or if that day is not a
Business Day, the succeeding Business Day), the Trustee shall deliver to the
Depositor, the Servicer and the Seller a Final Certification with respect to the
Mortgage Loans in the form of Exhibit H, with any applicable exceptions noted
thereon.

         If, in the course of its review, the Trustee finds any document
constituting a part of a Mortgage File that does not meet the requirements of
Section 2.01, the Trustee shall list such as an exception in the Final
Certification. The Trustee shall not make any determination as to whether (i)
any endorsement is sufficient to transfer all interest of the party so
endorsing, as noteholder or assignee thereof, in that Mortgage Note or (ii) any
assignment is in recordable form or is sufficient to effect the assignment of
and transfer to the assignee thereof under the mortgage to which the assignment
relates. The Seller shall promptly correct any defect that materially and
adversely affects the interests of the Certificateholders within 90 days from
the date it was so notified of the defect and, if the Seller does not correct
the defect within that period, the Seller shall either (a) substitute for the
related Mortgage Loan a Substitute Mortgage Loan, which substitution shall be
accomplished in the pursuant Section 2.03, or (b) purchase the Mortgage Loan at
its Purchase Price from the Trustee within 90 days from the date the Seller was
notified of the defect in writing.

         If a substitution or purchase of a Mortgage Loan pursuant to this
provision is required because of a delay in delivery of any documents by the
appropriate recording office, or there is a dispute between either the Servicer
or the Seller and the Trustee over the location or status of the recorded
document, then the substitution or purchase shall occur within 720 days from the
Closing Date. In no other case may a substitution or purchase occur more than
540 days from the Closing Date.

         The Trustee shall deliver written notice to each Rating Agency within
270 days from the Closing Date indicating each Mortgage Loan (a) that has not
been returned by the appropriate recording office or (b) as to which there is a
dispute as to location or status of the Mortgage Loan. The notice shall be
delivered every 90 days thereafter until the related Mortgage Loan is returned
to the Trustee. Any substitution pursuant to (a) above or purchase pursuant to
(b) above shall not be effected before the delivery to the Trustee of the
Opinion of Counsel required by Section 2.05, and any substitution pursuant to
(a) above shall not be effected before the additional delivery to the Trustee of
a Request for Release substantially in the form of Exhibit N. No substitution is
permitted to be made in any calendar month after the Determination Date for the
month.

         The Purchase Price for any Mortgage Loan shall be deposited by the
Seller in the Certificate Account by the Distribution Account Deposit Date for
the Distribution Date in the month following the month of repurchase and, upon
receipt of the deposit and certification with respect thereto in the form of
Exhibit N, the Trustee shall release the related Mortgage File to the Seller and
shall execute and deliver at the Seller's request any instruments of transfer or
assignment prepared by the Seller, in each case without



                                       45
<PAGE>

recourse, necessary to vest in the Seller, or a designee, the Trustee's interest
in any Mortgage Loan released pursuant hereto.

         If pursuant to the foregoing provisions the Seller repurchases a
Mortgage Loan that is a MERS Mortgage Loan, the Servicer shall either (i) cause
MERS to execute and deliver an assignment of the Mortgage in recordable form to
transfer the Mortgage from MERS to the Seller and shall cause such Mortgage to
be removed from registration on the MERS(R) System in accordance with MERS'
rules and regulations or (ii) cause MERS to designate on the MERS(R) System the
Seller as the beneficial holder of such Mortgage Loan.

         The Trustee shall retain possession and custody of each Mortgage File
in accordance with and subject to the terms and conditions set forth herein. The
Servicer shall promptly deliver to the Trustee, upon the execution or receipt
thereof, the originals of any other documents or instruments constituting the
Mortgage File that come into the possession of the Servicer from time to time.

         Section 2.03 Representations, Warranties, and Covenants of the Seller
and the Servicer.

         (a) IndyMac, in its capacities as Seller and Servicer, makes the
representations and warranties in Schedule II, and by this reference
incorporated in this Agreement, to the Depositor and the Trustee, as of the
Closing Date.

         (b) The Seller, in its capacity as Seller, makes the representations
and warranties in Schedule III, and by this reference incorporated in this
Agreement, to the Depositor and the Trustee, as of the Closing Date, or if so
specified in Schedule III, as of the Cut-off Date.

         (c) Upon discovery by any of the parties hereto of a breach of a
representation or warranty made pursuant to Section 2.03(b) that materially and
adversely affects the interests of the Certificateholders in any Mortgage Loan,
the party discovering such breach shall give prompt notice thereof to the other
parties. Any breach of representations and warranties under clauses (28), (32)
and (37) of Schedule III shall be deemed to affect materially and adversely the
interests of the Certificateholders in the affected Mortgage Loans. The Seller
covenants that within 90 days of the earlier of its discovery or its receipt of
written notice from any party of a breach of any representation or warranty made
pursuant to Section 2.03(b) which materially and adversely affects the interests
of the Certificateholders in any Mortgage Loan, it shall cure such breach in all
material respects, and if such breach is not so cured, shall, (i) if the 90-day
period expires before the second anniversary of the Closing Date, remove the
Mortgage Loan (a "Deleted Mortgage Loan") from the Trust Fund and substitute in
its place a Substitute Mortgage Loan, in accordance with this Section 2.03; or
(ii) repurchase the affected Mortgage Loan or Mortgage Loans from the Trustee at
the Purchase Price in the manner set forth below. Any substitution pursuant to
(i) above shall not be effected before the delivery to the Trustee of the
Opinion of Counsel required by Section 2.05 and a Request for Release
substantially in the form of Exhibit N, and the Mortgage File for any Substitute
Mortgage Loan. The Seller shall promptly reimburse the Servicer and the Trustee
for any expenses reasonably incurred by the Servicer or the Trustee in respect
of enforcing the remedies for the breach.

         With respect to any Substitute Mortgage Loan or Loans, the Seller shall
deliver to the Trustee for the benefit of the Certificateholders the Mortgage
Note, the Mortgage, the related assignment of the Mortgage, and such other
documents and agreements as are required by Section 2.01, with the Mortgage Note
endorsed and the Mortgage assigned as required by Section 2.01. No substitution
is permitted to be made in any calendar month after the Determination Date for
such month. Scheduled Payments due with respect to Substitute Mortgage Loans in
the month of substitution shall not be part of the Trust Fund and will be
retained by the Seller on the next succeeding Distribution Date. For the month
of substitution,



                                       46
<PAGE>

distributions to Certificateholders will include the monthly payment due on any
Deleted Mortgage Loan for such month and thereafter the Seller shall be entitled
to retain all amounts received in respect of such Deleted Mortgage Loan.

         The Servicer shall amend the Mortgage Loan Schedule for the benefit of
the Certificateholders to reflect the removal of the Deleted Mortgage Loan and
the substitution of the Substitute Mortgage Loans and the Servicer shall deliver
the amended Mortgage Loan Schedule to the Trustee. Upon the substitution, the
Substitute Mortgage Loans shall be subject to this Agreement in all respects,
and the Seller shall be deemed to have made with respect to the Substitute
Mortgage Loans, as of the date of substitution, the representations and
warranties made pursuant to Section 2.03(b) with respect to the Mortgage Loan.
Upon any substitution and the deposit to the Certificate Account of the amount
required to be deposited therein in connection with the substitution as
described in the following paragraph, the Trustee shall release the Mortgage
File held for the benefit of the Certificateholders relating to the Deleted
Mortgage Loan to the Seller and shall execute and deliver at the Seller's
direction such instruments of transfer or assignment prepared by the Seller, in
each case without recourse, as shall be necessary to vest title in the Seller,
or its designee, the Trustee's interest in any Deleted Mortgage Loan substituted
for pursuant to this Section 2.03.

         For any month in which the Seller substitutes one or more Substitute
Mortgage Loans for one or more Deleted Mortgage Loans, the Servicer will
determine the amount (if any) by which the aggregate principal balance of all
such Substitute Mortgage Loans as of the date of substitution is less than the
aggregate Stated Principal Balance of all such Deleted Mortgage Loans (after
application of the scheduled principal portion of the monthly payments due in
the month of substitution). The amount of such shortage (the "Substitution
Adjustment Amount") plus, if the Seller is not the Servicer, an amount equal to
the aggregate of any unreimbursed Advances and Servicer Advances with respect to
such Deleted Mortgage Loans shall be deposited into the Certificate Account by
the Seller by the Distribution Account Deposit Date for the Distribution Date in
the month succeeding the calendar month during which the related Mortgage Loan
became required to be purchased or replaced hereunder. If the Seller repurchases
a Mortgage Loan, the Purchase Price therefor shall be deposited in the
Certificate Account pursuant to Section 3.06 by the Distribution Account Deposit
Date for the Distribution Date in the month following the month during which the
Seller became obligated hereunder to repurchase or replace the Mortgage Loan and
upon such deposit of the Purchase Price and receipt of a Request for Release in
the form of Exhibit N, the Trustee shall release the related Mortgage File held
for the benefit of the Certificateholders to such Person, and the Trustee shall
execute and deliver at such Person's direction such instruments of transfer or
assignment prepared by such Person, in each case without recourse, as shall be
necessary to transfer title from the Trustee. The obligation under this
Agreement of any Person to cure, repurchase, or replace any Mortgage Loan as to
which a breach has occurred and is continuing shall constitute the sole remedy
against the Person respecting the breach available to Certificateholders, the
Depositor, or the Trustee on their behalf.

         The representations and warranties made pursuant to this Section 2.03
shall survive delivery of the respective Mortgage Files to the Trustee for the
benefit of the Certificateholders.

         The Seller assigns to the Depositor and the Depositor assigns to the
Trustee all rights the Seller might have under contracts with third parties
relating to early payment defaults on the Mortgage Loans ("EPD Rights") and the
Servicer assumes any related duties as part of it servicing obligations.
Consistent with the Servicing Standard, the Servicer shall attempt to enforce
the EPD rights. If the Servicer's enforcement of the EPD Rights obligates the
Servicer to sell a Mortgage Loan to a third party, the Servicer shall repurchase
the Mortgage Loan at the Purchase Price and sell the Mortgage Loan to the third
party, provided however, in no case shall the Servicer be obligated to
repurchase a Mortgage Loan on account of EPD Rights unless and until the
Servicer shall have previously received repurchase payment



                                        47
<PAGE>

from a third party. The Servicer shall deposit into the Certificate Account all
amounts received in connection with the enforcement of EPD Rights, not exceeding
the Purchase Price, with respect to any Mortgage Loan. Any amounts received by
the Servicer with respect a Mortgage Loan in excess of the Purchase Price shall
be retained by the Servicer as additional servicing compensation. The Trustee,
upon receipt of certification from the Servicer of the deposit of the Purchase
Price in connection with a repurchase of a Mortgage Loan and a Request for File
Release from the Servicer, shall release or cause to be released to the
purchaser of such Mortgage Loan the related Mortgage File and shall execute and
deliver such instruments of transfer or assignment prepared by the purchaser of
such Mortgage Loan, in each case without recourse, as shall be necessary to vest
in the purchaser of such Mortgage Loan any Mortgage Loan released pursuant
hereto and the purchaser of such Mortgage Loan shall succeed to all the
Trustee's right, title and interest in and to such Mortgage Loan and all
security and documents related thereto. Such assignment shall be an assignment
outright and not for security. The purchaser of such Mortgage Loan shall
thereupon own such Mortgage Loan, and all security and documents, free of any
further obligation to the Trustee or the Certificateholders with respect
thereto.

         Section 2.04 Representations and Warranties of the Depositor as to the
Mortgage Loans.

         (a) The Depositor represents and warrants to the Trustee with respect
to each Mortgage Loan as of the date of this Agreement or such other date set
forth in this Agreement that as of the Closing Date, and following the transfer
of the Mortgage Loans to it by the Seller, the Depositor had good title to the
Mortgage Loans and the Mortgage Notes were subject to no offsets, defenses, or
counterclaims.

         (b) The representations and warranties in this Section 2.04 shall
survive delivery of the Mortgage Files to the Trustee. Upon discovery by the
Depositor or the Trustee of any breach of any of the representations and
warranties in this Section that materially and adversely affects the interest of
the Certificateholders, the party discovering the breach shall give prompt
written notice to the others and to each Rating Agency.

         Section 2.05 Delivery of Opinion of Counsel in Connection with
Substitutions.

         (a) Notwithstanding any contrary provision of this Agreement, no
substitution pursuant to Section 2.02 or 2.03 shall be made more than 90 days
after the Closing Date unless the Seller delivers to the Trustee an Opinion of
Counsel, which Opinion of Counsel shall not be at the expense of either the
Trustee or the Trust Fund, addressed to the Trustee, to the effect that such
substitution will not (i) result in the imposition of the tax on "prohibited
transactions" on the Trust Fund or contributions after the Startup Date, as
defined in sections 860F(a)(2) and 860G(d) of the Code, respectively or (ii)
cause any REMIC created under this Agreement to fail to qualify as a REMIC at
any time that any Certificates are outstanding.

         (b) Upon discovery by the Depositor, the Seller, the Servicer or the
Trustee that any Mortgage Loan does not constitute a "qualified mortgage" within
the meaning of section 860G(a)(3) of the Code, the party discovering such fact
shall promptly (and in any event within five Business Days of discovery) give
written notice thereof to the other parties. In connection therewith, the
Trustee shall require the Seller, at the Seller's option, to either (i)
substitute, if the conditions in Section 2.03(c) with respect to substitutions
are satisfied, a Substitute Mortgage Loan for the affected Mortgage Loan, or
(ii) repurchase the affected Mortgage Loan within 90 days of such discovery in
the same manner as it would a Mortgage Loan for a breach of representation or
warranty made pursuant to Section 2.03. The Trustee shall reconvey to the Seller
the Mortgage Loan to be released pursuant hereto in the same manner, and on the
same terms and conditions, as it would a Mortgage Loan repurchased for breach of
a representation or warranty contained in Section 2.03.



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<PAGE>

Section 2.06       Execution and Delivery of Certificates.

         The Trustee acknowledges the transfer and assignment to it of the Trust
Fund and, concurrently with such transfer and assignment, has executed and
delivered to or upon the order of the Depositor, the Certificates in authorized
denominations evidencing directly or indirectly the entire ownership of the
Trust Fund. The Trustee agrees to hold the Trust Fund and exercise the rights
referred to above for the benefit of all present and future Holders of the
Certificates.

Section 2.07       REMIC Matters.

         The Preliminary Statement sets forth the designations and "latest
possible maturity date" for federal income tax purposes of all interests created
under this Agreement. The "Startup Day" for purposes of the REMIC Provisions
shall be the Closing Date. Each REMIC's fiscal year shall be the calendar year.



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<PAGE>

                                 ARTICLE THREE

                 ADMINISTRATION AND SERVICING OF MORTGAGE LOANS

         Section 3.01 Servicer to Service Mortgage Loans.

         For and on behalf of the Certificateholders, the Servicer shall service
and administer the Mortgage Loans in accordance with this Agreement and the
Servicing Standard.

         The Servicer shall not make or permit any modification, waiver, or
amendment of any term of any Mortgage Loan that would cause any REMIC created
under this Agreement to fail to qualify as a REMIC or result in the imposition
of any tax under section 860F(a) or section 860G(d) of the Code.

         Without limiting the generality of the foregoing, the Servicer, in its
own name or in the name of the Depositor and the Trustee, is hereby authorized
and empowered by the Depositor and the Trustee, when the Servicer believes it
appropriate in its reasonable judgment, to execute and deliver, on behalf of the
Trustee, the Depositor, the Certificateholders, or any of them, any instruments
of satisfaction or cancellation, or of partial or full release or discharge, and
all other comparable instruments, with respect to the Mortgage Loans, and with
respect to the Mortgaged Properties held for the benefit of the
Certificateholders. The Servicer shall prepare and deliver to the Depositor or
the Trustee any documents requiring execution and delivery by either or both of
them appropriate to enable the Servicer to service and administer the Mortgage
Loans to the extent that the Servicer is not permitted to execute and deliver
such documents pursuant to the preceding sentence. Upon receipt of the
documents, the Depositor or the Trustee shall execute the documents and deliver
them to the Servicer.

         The Servicer further is authorized and empowered by the Trustee, on
behalf of the Certificateholders and the Trustee, in its own name when the
Servicer believes it appropriate in its best judgment to register any Mortgage
Loan on the MERS(R) System, or cause the removal from the registration of any
Mortgage Loan on the MERS(R) System, to execute and deliver, on behalf of the
Trustee and the Certificateholders or any of them, any and all instruments of
assignment and other comparable instruments with respect to such assignment or
re-recording of a Mortgage in the name of MERS, solely as nominee for the
Trustee and its successors and assigns.

         In accordance with and to the extent of the Servicing Standard, the
Servicer shall advance funds necessary to effect the payment of taxes and
assessments on the Mortgaged Properties, which advances shall be reimbursable in
the first instance from related collections from the Mortgagors pursuant to
Section 3.07, and further as provided in Section 3.09. The costs incurred by the
Servicer in effecting the timely payments of taxes and assessments on the
Mortgaged Properties and related insurance premiums shall not, for the purpose
of calculating monthly distributions to the Certificateholders, be added to the
Stated Principal Balances of the related Mortgage Loans, notwithstanding that
the Mortgage Loans so permit.

         Nothing in this Agreement to the contrary shall limit the Servicer from
undertaking any legal action that it may deem appropriate with respect to the
Mortgage Loans including, without limitation, any rights or causes of actions
arising out of the origination of the Mortgage Loans.



                                       50
<PAGE>

         Section 3.02 [Reserved].

         Section 3.03 Rights of the Depositor and the Trustee in Respect of the
Servicer.

         The Depositor may, but is not obligated to, enforce the obligations of
the Servicer under this Agreement and may, but is not obligated to, perform, or
cause a designee to perform, any defaulted obligation of the Servicer under this
Agreement and in connection with any such defaulted obligation to exercise the
related rights of the Servicer under this Agreement; provided that the Servicer
shall not be relieved of any of its obligations under this Agreement by virtue
of such performance by the Depositor or its designee. Neither the Trustee nor
the Depositor shall have any responsibility or liability for any action or
failure to act by the Servicer nor shall the Trustee or the Depositor be
obligated to supervise the performance of the Servicer under this Agreement or
otherwise.

         Section 3.04 [Reserved].

          Section 3.05 Trustee to Act as Servicer.

         If the Servicer for any reason is no longer the Servicer under this
Agreement (including because of the occurrence or existence of an Event of
Default or termination by the Depositor), the Trustee or its successor shall
assume all of the rights and obligations of the Servicer under this Agreement
arising thereafter (except that the Trustee shall not be

                  (i) liable for losses of the Servicer pursuant to Section 3.10
         or any acts or omissions of the predecessor Servicer hereunder,

                  (ii) obligated to make Advances if it is prohibited from doing
         so by applicable law,

                  (iii) obligated to effectuate repurchases or substitutions of
         Mortgage Loans hereunder, including repurchases or substitutions
         pursuant to Section 2.02 or 2.03,

                  (iv) responsible for expenses of the Servicer pursuant to
         Section 2.03, or

                  (v) deemed to have made any representations and warranties of
         the Servicer hereunder). Any assumption shall be subject to Section
         7.02.

         Notwithstanding anything else in this Agreement to the contrary, in no
event shall the Trustee be liable for any servicing fee or for any differential
in the amount of the Servicing Fee paid under this Agreement and the amount
necessary to induce any successor Servicer to act as successor Servicer under
this Agreement and the transactions provided for in this Agreement.

          Section 3.06 Collection of Mortgage Loan Payments; Servicing Accounts;
Collection Account; Certificate Account; Distribution Account; Supplemental
Interest Trust; Supplemental Interest Reserve Fund.

         (a) In accordance with and to the extent of the Servicing Standard, the
Servicer shall make reasonable efforts in accordance with the customary and
usual standards of practice of prudent mortgage servicers to collect all
payments called for under the Mortgage Loans to the extent the procedures are
consistent with this Agreement and any related Required Insurance Policy.
Consistent with the foregoing, the Servicer may in its discretion (i) waive any
late payment charge or, subject to Section 3.20, any Prepayment Charge in
connection



                                        51
<PAGE>

with the prepayment of a Mortgage Loan and (ii) extend the due dates for
payments due on a Delinquent Mortgage Loan for a period not greater than 125
days. In connection with a seriously delinquent or defaulted Mortgage Loan, the
Servicer may, consistent with the Servicing Standard, waive, modify or vary any
term of that Mortgage Loan (including modifications that change the Mortgage
Rate, forgive the payment of principal or interest or extend the final maturity
date of that Mortgage Loan ), accept payment from the related Mortgagor of an
amount less than the Stated Principal Balance in final satisfaction of that
Mortgage Loan, or consent to the postponement of strict compliance with any such
term or otherwise grant indulgence to any Mortgagor if in the Servicer's
determination such waiver, modification, postponement or indulgence is not
materially adverse to the interests of the Certificateholders (taking into
account any estimated loss that might result absent such action) and is expected
to minimize the loss on such Mortgage Loan; provided, however, the Servicer
shall not initiate new lending to such Mortgagor through the Trust and cannot,
except as provided in the immediately succeeding sentence, extend the maturity
of any Mortgage Loan past the date on which the final payment is due on the
latest maturing Mortgage Loan as of the Cut-off Date. With respect to no more
than 5% of the Mortgage Loans (measured by aggregate Cut-off Date Principal
Balance of the Mortgage Loans), the Servicer may extend the maturity of a
Mortgage Loan past the date on which the final payment is due on the latest
maturing Mortgage Loan as of the Cut-off Date, but in no event more than one
year past such date. In the event of any such arrangement, the Servicer shall
make Advances on the related Mortgage Loan in accordance with Section 4.01
during the scheduled period in accordance with the amortization schedule of the
Mortgage Loan without modification thereof because of the arrangements. The
Servicer shall not be required to institute or join in litigation with respect
to collection of any payment (whether under a Mortgage, Mortgage Note, or
otherwise or against any public or governmental authority with respect to a
taking or condemnation) if it reasonably believes that enforcing the provision
of the Mortgage or other instrument pursuant to which the payment is required is
prohibited by applicable law. The Servicer shall not have the discretion to sell
any Delinquent or defaulted Mortgage Loan.

         (b) The Servicer shall establish and maintain a Certificate Account
into which the Servicer shall deposit on a daily basis (i) within one Business
Day of deposit in the Collection Account (in the case of items (i) through (iii)
below) and (2) within one Business Day of receipt (in the case of all other
items), except as otherwise specified herein, the following payments and
collections received by it in respect of Mortgage Loans after the Cut-off Date
(other than in respect of principal and interest due on the Mortgage Loans by
the Cut-off Date) and the following amounts required to be deposited hereunder:

                  (i) all payments on account of principal on the Mortgage
         Loans, including Principal Prepayments;

                  (ii) all payments on account of interest on the Mortgage
         Loans, net of the Servicing Fee;

                  (iii) all Insurance Proceeds, Subsequent Recoveries and
         Liquidation Proceeds, other than proceeds to be applied to the
         restoration or repair of the Mortgaged Property or released to the
         Mortgagor in accordance with the Servicer's normal servicing
         procedures;

                  (iv) any amount required to be deposited by the Servicer
         pursuant to Section 3.06(f) in connection with any losses on Permitted
         Investments;

                  (v) any amounts required to be deposited by the Servicer
         pursuant to Sections 3.10 and 3.12;

                  (vi) all Purchase Prices from the Servicer or Seller and all
         Substitution Adjustment Amounts;

                  (vii) all Advances made by the Servicer pursuant to Section
         4.01;



                                       52
<PAGE>

                  (viii) any other amounts required to be deposited under this
         Agreement; and

                  (ix) all Prepayment Charges collected.

         In addition, with respect to any Mortgage Loan that is subject to a
buydown agreement, on each Due Date for the Mortgage Loan, in addition to the
monthly payment remitted by the Mortgagor, the Servicer shall cause funds to be
deposited into the Certificate Account in an amount required to cause an amount
of interest to be paid with respect to the Mortgage Loan equal to the amount of
interest that has accrued on the Mortgage Loan from the preceding Due Date at
the Mortgage Rate net of the Servicing Fee Rate on that date.

         The foregoing requirements for remittance by the Servicer shall be
exclusive, it being understood and agreed that, without limiting the generality
of the foregoing, payments in the nature of late payment charges or assumption
fees, if collected, need not be remitted by the Servicer. If the Servicer remits
any amount not required to be remitted, it may at any time withdraw that amount
from the Certificate Account, any provision in this Agreement to the contrary
notwithstanding. The withdrawal or direction may be accomplished by delivering
written notice of it to the Trustee or any other institution maintaining the
Certificate Account that describes the amounts deposited in error in the
Certificate Account. The Servicer shall maintain adequate records with respect
to all withdrawals made pursuant to this Section 3.06. All funds deposited in
the Certificate Account shall be held in trust for the Certificateholders until
withdrawn in accordance with Section 3.09.

         (c) The Trustee shall establish and maintain the Distribution Account
on behalf of the Certificateholders. The Trustee shall, promptly upon receipt,
deposit in the Distribution Account and retain in the Distribution Account the
following:

                  (i) the aggregate amount remitted by the Servicer to the
         Trustee pursuant to Section 3.09(a);

                  (ii) any amount deposited by the Servicer pursuant to Section
         3.06(d) in connection with any losses on Permitted Investments; and

                  (iii) any other amounts deposited under this Agreement that
         are required to be deposited in the Distribution Account.

         If the Servicer remits any amount not required to be remitted, it may
at any time direct the Trustee in writing to withdraw that amount from the
Distribution Account, any provision in this Agreement to the contrary
notwithstanding. The direction may be accomplished by delivering an Officer's
Certificate to the Trustee that describes the amounts deposited in error in the
Distribution Account. All funds deposited in the Distribution Account shall be
held by the Trustee in trust for the Certificateholders until disbursed in
accordance with this Agreement or withdrawn in accordance with Section 3.09. In
no event shall the Trustee incur liability for withdrawals from the Distribution
Account at the direction of the Servicer.

         (d) Each institution at which the Certificate Account is maintained
shall invest the funds in such account as directed in writing by the Servicer in
Permitted Investments, which shall mature not later than the second Business Day
preceding the related Distribution Account Deposit Date (except that if the
Permitted Investment is an obligation of the institution that maintains the
account, then the Permitted Investment shall mature not later than the Business
Day preceding the Distribution Account Deposit Date) and which shall not be sold
or disposed of before its maturity. The funds in the Distribution Account shall
remain uninvested. All such Permitted Investments shall be made in the name of
the Trustee, for the



                                       53
<PAGE>

benefit of the Certificateholders. All income realized from any such investment
of funds on deposit in the Certificate Account shall be for the benefit of the
Servicer as servicing compensation and shall be remitted to it monthly as
provided in this Agreement. The amount of any realized losses on Permitted
Investments in the Certificate Account shall promptly be deposited by the
Servicer in the Certificate Account. The Trustee shall not be liable for the
amount of any loss incurred in respect of any investment or lack of investment
of funds held in the Certificate Account and made in accordance with this
Section 3.06.

         (e) (i) On the Closing Date, there is hereby established a separate
trust (the "Supplemental Interest Trust"), the assets of which shall consist of
the Supplemental Interest Reserve Fund and the Supplemental Interest Trustee's
rights and obligations under the Corridor Contract. The Supplemental Interest
Trust shall be maintained by the Supplemental Interest Trustee, who initially
shall be the Trustee.

         (ii) On the Closing Date, the Supplemental Interest Trustee shall
establish and maintain in its name, in trust for the benefit of the Holders of
the Class A-10 Certificates, the Supplemental Interest Reserve Fund. All funds
on deposit in the Supplemental Interest Reserve Fund shall be held separate and
apart from, and shall not be commingled with, any other moneys, including
without limitation, other moneys held by the Trustee pursuant to this Agreement.

         (iii) On each Distribution Date, the Supplemental Interest Trustee
shall deposit into the Supplemental Interest Reserve Fund all amounts received
in respect of the Corridor Contract for the Class A-10 Certificates for the
related Interest Accrual Period. Funds in the Supplemental Interest Reserve Fund
shall not be invested. The Supplemental Interest Trustee shall make withdrawals
from the Supplemental Interest Reserve Fund to make distributions pursuant to
Section 4.08 exclusively (other than as expressly provided for in Section 3.09).

                  (f) The Servicer shall give notice to the Trustee, the Seller,
         each Rating Agency and the Depositor of any proposed change of the
         location of the Certificate Account not later than 30 days and not more
          than 45 days prior to any change of this Agreement. The Trustee shall
         give notice to the Servicer, the Seller, each Rating Agency and the
         Depositor of any proposed change of the location of the Distribution
         Account not later than 30 days and not more than 45 days prior to any
         change of this Agreement. The Supplemental Interest Trustee shall give
         notice to the Servicer, the Seller, each Rating Agency and the
         Depositor of any proposed change of the location of the Supplemental
         Interest Reserve Fund prior to any change thereof.

         Section 3.07 Collection of Taxes, Assessments and Similar Items; Escrow
Accounts.

                  (a) To the extent required by the related Mortgage Note and
         not violative of current law, the Servicer shall establish and maintain
         one or more accounts (each, an "Escrow Account") and deposit and retain
         therein all collections from the Mortgagors (or advances) for the
         payment of taxes, assessments, hazard insurance premiums or comparable
         items for the account of the Mortgagors. Nothing herein shall require
         the Servicer to compel a Mortgagor to establish an Escrow Account in
         violation of applicable law.

                  (b) Withdrawals of amounts so collected from the Escrow
         Accounts may be made only to effect timely payment of taxes,
         assessments, hazard insurance premiums, condominium or PUD association
         dues, or comparable items, to reimburse (without duplication) the
         Servicer out of related collections for any payments made pursuant to
         Section 3.01 (with respect to taxes and assessments and insurance
         premiums) and Section 3.10 (with respect to hazard insurance), to
         refund to any Mortgagors any sums determined to be overages, to pay
         interest, if required by law or the related Mortgage or Mortgage Note,
         to Mortgagors on balances in the Escrow



                                        54
<PAGE>

         Account or to clear and terminate the Escrow Account at the termination
         of this Agreement in accordance with Section 9.01. The Escrow Accounts
         shall not be a part of the Trust Fund.

                  (c) The Servicer shall advance any payments referred to in
         Section 3.07(a) that are not timely paid by the Mortgagors or advanced
         by the Servicer on the date when the tax, premium or other cost for
         which such payment is intended is due, but the Servicer shall be
         required so to advance only to the extent that such advances, in the
         good faith judgment of the Servicer, will be recoverable by the
         Servicer out of Insurance Proceeds, Liquidation Proceeds or otherwise.

         Section 3.08 Access to Certain Documentation and Information Regarding
the Mortgage Loans.

         The Servicer shall afford the Depositor and the Trustee reasonable
access to all records and documentation regarding the Mortgage Loans and all
accounts, insurance information and other matters relating to this Agreement,
such access being afforded without charge, but only upon reasonable request and
during normal business hours at the office designated by the Servicer.

         Upon reasonable advance notice in writing, the Servicer will provide to
each Certificateholder or Certificate Owner that is a savings and loan
association, bank, or insurance company certain reports and reasonable access to
information and documentation regarding the Mortgage Loans sufficient to permit
the Certificateholder or Certificate Owner to comply with applicable regulations
of the OTS or other regulatory authorities with respect to investment in the
Certificates. The Servicer shall be entitled to be reimbursed by each such
Certificateholder or Certificate Owner for actual expenses incurred by the
Servicer in providing the reports and access.

         Section 3.09 Permitted Withdrawals from the Certificate Account, the
Distribution Account and the Supplemental Interest Reserve Fund.

                  (a) The Servicer may (and, in the case of clause (ix) below,
         shall) from time to time make withdrawals from the Certificate Account
         for the following purposes:

                  (i) to pay to the Servicer (to the extent not previously
         retained) the servicing compensation to which it is entitled pursuant
         to Section 3.15, and to pay to the Servicer, as additional servicing
         compensation, earnings on or investment income with respect to funds in
         or credited to the Certificate Account;

                  (ii) to reimburse the Servicer or successor Servicer for the
         unreimbursed Advances made by it, such right of reimbursement pursuant
         to this subclause (ii) being limited to amounts received on the
         Mortgage Loans in respect of which the Advance was made;

                  (iii) to reimburse the Servicer or successor Servicer for any
         Nonrecoverable Advance previously made by it;

                   (iv) to reimburse the Servicer for Insured Expenses from the
         related Insurance Proceeds;

                  (v) to reimburse the Servicer for (a) unreimbursed Servicing
         Advances, the Servicer's right to reimbursement pursuant to this clause
         (a) with respect to any Mortgage Loan being limited to amounts received
         on the Mortgage Loans that represent late recoveries of the payments
         for which the advances were made pursuant to Section 3.01 or Section
          3.07, (b) unreimbursed Servicing



                                       55
<PAGE>

         Advances made in respect of a Mortgage Loan for which such Servicing
         Advances are not recoverable from the Mortgagor and (b) for unpaid
         Servicing Fees as provided in Section 3.12;

                  (vi) to pay to the purchaser, with respect to each Mortgage
         Loan or property acquired in respect of such Mortgage Loan that has
         been purchased pursuant to Section 2.02, 2.03, or 3.12, all amounts
         received thereon after the date of such purchase;

                  (vii) to reimburse the Seller, the Servicer, or the Depositor
         for expenses incurred by any of them and reimbursable pursuant to
         Section 6.03;

                  (viii) to withdraw any amount deposited in the Certificate
         Account and not required to be deposited in the Certificate Account;

                  (ix) by the Distribution Account Deposit Date, to withdraw (1)
         the Available Funds and the Trustee Fee for the Distribution Date, to
         the extent on deposit, and (2) the Prepayment Charges on deposit, and
         remit such amount to the Trustee for deposit in the Distribution
         Account; and

                  (x) to clear and terminate the Certificate Account upon
         termination of this Agreement pursuant to Section 9.01.

         The Servicer shall keep and maintain separate accounting, on a Mortgage
Loan by Mortgage Loan basis, to justify any withdrawal from the Certificate
Account pursuant to subclauses (i), (ii), (iv), (v), and (vi). Before making any
withdrawal from the Certificate Account pursuant to subclause (iii), the
Servicer shall deliver to the Trustee an Officer's Certificate of a Servicing
Officer indicating the amount of any previous Advance determined by the Servicer
to be a Nonrecoverable Advance and identifying the related Mortgage Loans and
their respective portions of the Nonrecoverable Advance.

                  (b) The Trustee shall withdraw funds from the Distribution
         Account for distributions to Certificateholders in the manner specified
         in this Agreement (and to withhold from the amounts so withdrawn the
         amount of any taxes that it is authorized to withhold pursuant to the
         last paragraph of Section 8.11). In addition, the Trustee may from time
         to time make withdrawals from the Distribution Account for the
         following purposes:

                  (i) to pay to itself the Trustee Fee for the related
         Distribution Date;

                  (ii) to withdraw and return to the Servicer any amount
         deposited in the Distribution Account and not required to be deposited
         therein; and

                  (iii) to clear and terminate the Distribution Account upon
         termination of the Agreement pursuant to Section 9.01.

                  (c) The Supplemental Interest Trustee shall withdraw funds on
         deposit in the Supplemental Interest Reserve Fund from the Corridor
         Contract for distribution to the Class A-10 Certificates in the manner
         specified in Section 4.08 (and to withhold from the amounts so
         withdrawn the amount of any taxes that it is authorized to retain
         pursuant to the second to last paragraph of Section 8.11). In addition,
         the Supplemental Interest Trustee may from time to time make
         withdrawals from the Supplemental Interest Reserve Fund for the
         following purposes:



                                        56
<PAGE>

                  (i) to withdraw any amount deposited in the Supplemental
         Interest Reserve Fund and not required to be deposited therein; and

                  (ii) to clear and terminate the Supplemental Interest Reserve
         Fund upon the earlier of (i) the reduction of the Class Certificate
         Balance of the Class A-10 Certificates to zero, and (ii) the
         termination of this Agreement pursuant to Section 9.01.

         Section 3.10 Maintenance of Hazard Insurance; Maintenance of Primary
Insurance Policies.

                  (a) The Servicer shall maintain, for each Mortgage Loan,
         hazard insurance with extended coverage in an amount that is at least
         equal to the lesser of

          (i) the maximum insurable value of the improvements securing the
Mortgage Loan and

         (ii) the greater of (y) the outstanding principal balance of the
Mortgage Loan and (z) an amount such that the proceeds of the policy are
sufficient to prevent the Mortgagor or the mortgagee from becoming a co-insurer.

         Each policy of standard hazard insurance shall contain, or have an
accompanying endorsement that contains, a standard mortgagee clause. Any amounts
collected under the policies (other than the amounts to be applied to the
restoration or repair of the related Mortgaged Property or amounts released to
the Mortgagor in accordance with the Servicer's normal servicing procedures)
shall be deposited in the Certificate Account. Any cost incurred in maintaining
any insurance shall not, for the purpose of calculating monthly distributions to
the Certificateholders or remittances to the Trustee for their benefit, be added
to the principal balance of the Mortgage Loan, notwithstanding that the Mortgage
Loan so permits. Such costs shall be recoverable by the Servicer out of late
payments by the related Mortgagor or out of Liquidation Proceeds to the extent
permitted by Section 3.09. No earthquake or other additional insurance is to be
required of any Mortgagor or maintained on property acquired in respect of a
Mortgage other than pursuant to any applicable laws and regulations in force
that require additional insurance. If the Mortgaged Property is located at the
time of origination of the Mortgage Loan in a federally designated special flood
hazard area and the area is participating in the national flood insurance
program, the Servicer shall maintain flood insurance for the Mortgage Loan. The
flood insurance shall be in an amount equal to the least of (i) the original
principal balance of the related Mortgage Loan, (ii) the replacement value of
the improvements that are part of the Mortgaged Property, and (iii) the maximum
amount of flood insurance available for the related Mortgaged Property under the
national flood insurance program.

         If the Servicer obtains and maintains a blanket policy insuring against
hazard losses on all of the Mortgage Loans, it shall have satisfied its
obligations in the first sentence of this Section 3.10. The policy may contain a
deductible clause on terms substantially equivalent to those commercially
available and maintained by comparable servicers. If the policy contains a
deductible clause and a policy complying with the first sentence of this Section
3.10 has not been maintained on the related Mortgaged Property, and if a loss
that would have been covered by the required policy occurs, the Servicer shall
deposit in the Certificate Account, without any right of reimbursement, the
amount not otherwise payable under the blanket policy because of the deductible
clause. In connection with its activities as Servicer of the Mortgage Loans, the
Servicer agrees to present, on behalf of itself, the Depositor, and the Trustee
for the benefit of the Certificateholders, claims under any blanket policy.

                  (b) The Servicer shall not take any action that would result
         in non-coverage under any applicable Primary Insurance Policy of any
         loss that, but for the actions of the Servicer, would have



                                        57
<PAGE>

         been covered thereunder. The Servicer shall not cancel or refuse to
         renew any Primary Insurance Policy that is in effect at the date of the
         initial issuance of the Certificates and is required to be kept in
         force hereunder unless the replacement Primary Insurance Policy for the
         canceled or non-renewed policy is maintained with a Qualified Insurer.
         The Servicer need not maintain any Primary Insurance Policy if
         maintaining the Primary Insurance Policy is prohibited by applicable
         law. The Servicer agrees, to the extent permitted by applicable law, to
         effect the timely payment of the premiums on each Primary Insurance
         Policy, and any costs not otherwise recoverable shall be recoverable by
         the Servicer from the related liquidation proceeds.

         In connection with its activities as Servicer of the Mortgage Loans,
the Servicer agrees to present, on behalf of itself, the Trustee and the
Certificateholders, claims to the insurer under any Primary Insurance Policies
and, in this regard, to take any reasonable action in accordance with the
Servicing Standard necessary to permit recovery under any Primary Insurance
Policies respecting defaulted Mortgage Loans. Any amounts collected by the
Servicer under any Primary Insurance Policies shall be deposited in the
Certificate Account or the Collection Account (as applicable).

         Section 3.11 Enforcement of Due-On-Sale Clauses; Assumption Agreements.

                  (a) Except as otherwise provided in this Section 3.11, when
         any property subject to a Mortgage has been conveyed by the Mortgagor,
         the Servicer shall to the extent that it has knowledge of the
         conveyance and in accordance with the Servicing Standard, enforce any
         due-on-sale clause contained in any Mortgage Note or Mortgage, to the
         extent permitted under applicable law and governmental regulations, but
         only to the extent that enforcement will not adversely affect or
         jeopardize coverage under any Required Insurance Policy.
         Notwithstanding the foregoing, the Servicer is not required to exercise
         these rights with respect to a Mortgage Loan if the Person to whom the
         related Mortgaged Property has been conveyed or is proposed to be
         conveyed satisfies the conditions contained in the Mortgage Note and
         Mortgage related thereto and the consent of the mortgagee under the
         Mortgage Note or Mortgage is not otherwise so required under the
         Mortgage Note or Mortgage as a condition to the transfer.

         If (i) the Servicer is prohibited by law from enforcing any due-on-sale
clause, (ii) coverage under any Required Insurance Policy would be adversely
affected, (iii) the Mortgage Note does not include a due-on-sale clause, or (iv)
nonenforcement is otherwise permitted hereunder, the Servicer is authorized,
subject to Section 3.11(b), to take or enter into an assumption and modification
agreement from or with the person to whom the property has been or is about to
be conveyed, pursuant to which the person becomes liable under the Mortgage Note
and, unless prohibited by applicable state law, the Mortgagor remains liable
thereon. The Mortgage Loan must continue to be covered (if so covered before the
Servicer enters into the agreement) by the applicable Required Insurance
Policies.

         The Servicer, subject to Section 3.11(b), is also authorized with the
prior approval of the insurers under any Required Insurance Policies to enter
into a substitution of liability agreement with the Person, pursuant to which
the original Mortgagor is released from liability and the Person is substituted
as Mortgagor and becomes liable under the Mortgage Note. Notwithstanding the
foregoing, the Servicer shall not be deemed to be in default under this Section
3.11 because of any transfer or assumption that the Servicer reasonably believes
it is restricted by law from preventing, for any reason whatsoever.

                  (b) Subject to the Servicer's duty to enforce any due-on-sale
         clause to the extent set forth in Section 3.11(a), in any case in which
         a Mortgaged Property has been conveyed to a Person by a Mortgagor, and
         the Person is to enter into an assumption agreement or modification
         agreement or supplement to the Mortgage Note or Mortgage that requires
         the signature of the Trustee, or if an instrument of release signed by
          the Trustee is required releasing the Mortgagor



                                       58
<PAGE>

         from liability on the Mortgage Loan, the Servicer shall prepare and
         deliver to the Trustee for signature and shall direct the Trustee, in
         writing, to execute the assumption agreement with the Person to whom
         the Mortgaged Property is to be conveyed, and the modification
         agreement or supplement to the Mortgage Note or Mortgage or other
         instruments appropriate to carry out the terms of the Mortgage Note or
         Mortgage or otherwise to comply with any applicable laws regarding
         assumptions or the transfer of the Mortgaged Property to the Person. In
         connection with any such assumption, no material term of the Mortgage
         Note may be changed.

         In addition, the substitute Mortgagor and the Mortgaged Property must
be acceptable to the Servicer in accordance with its underwriting standards as
then in effect. Together with each substitution, assumption, or other agreement
or instrument delivered to the Trustee for execution by it, the Servicer shall
deliver an Officer's Certificate signed by a Servicing Officer stating that the
requirements of this subsection have been met in connection with such Officer's
Certificate. The Servicer shall notify the Trustee that any substitution or
assumption agreement has been completed by forwarding to the Trustee the
original of the substitution or assumption agreement, which in the case of the
original shall be added to the related Mortgage File and shall, for all
purposes, be considered a part of the Mortgage File to the same extent as all
other documents and instruments constituting a part of the Mortgage File. The
Servicer will retain any fee collected by it for entering into an assumption or
substitution of liability agreement as additional servicing compensation.

         Section 3.12 Realization Upon Defaulted Mortgage Loans.

         The Servicer shall use reasonable efforts in accordance with the
Servicing Standard to foreclose on or otherwise comparably convert the ownership
of assets securing such of the Mortgage Loans as come into and continue in
default and as to which no satisfactory arrangements can be made for collection
of delinquent payments. In connection with the foreclosure or other conversion,
the Servicer shall follow the Servicing Standard and shall follow the
requirements of the insurer under any Required Insurance Policy. The Servicer
shall not be required to expend its own funds in connection with any foreclosure
or towards the restoration of any property unless it determines (i) that the
restoration or foreclosure will increase the proceeds of liquidation of the
Mortgage Loan after reimbursement to itself of restoration expenses and (ii)
that restoration expenses will be recoverable to it through Liquidation Proceeds
(respecting which it shall have priority for purposes of withdrawals from the
Certificate Account). The Servicer shall be responsible for all other costs and
expenses incurred by it in any foreclosure proceedings. The Servicer is entitled
to reimbursement of such costs and expenses from the liquidation proceeds with
respect to the related Mortgaged Property, as provided in the definition of
Liquidation Proceeds. If the Servicer has knowledge that a Mortgaged Property
that the Servicer is contemplating acquiring in foreclosure or by deed in lieu
of foreclosure is located within a one mile radius of any site listed in the
Expenditure Plan for the Hazardous Substance Clean Up Bond Act of 1984 or other
site with environmental or hazardous waste risks known to the Servicer, the
Servicer will, before acquiring the Mortgaged Property, consider the risks and
only take action in accordance with its established environmental review
procedures.

         With respect to any REO Property, the deed or certificate of sale shall
be taken in the name of the Trustee for the benefit of the Certificateholders,
or its nominee, on behalf of the Certificateholders. The Trustee's name shall be
placed on the title to the REO Property solely as the Trustee hereunder and not
in its individual capacity. The Servicer shall ensure that the title to the REO
Property references the Pooling and Servicing Agreement and the Trustee's
capacity hereunder. Pursuant to its efforts to sell the REO Property, the
Servicer shall either itself or through an agent selected by the Servicer
protect and conserve the REO Property in accordance with the Servicing Standard.



                                        59
<PAGE>

         The Servicer shall perform the tax reporting and withholding required
by sections 1445 and 6050J of the Code with respect to foreclosures and
abandonments, the tax reporting required by section 6050H of the Code with
respect to the receipt of mortgage interest from individuals and, if required by
section 6050P of the Code with respect to the cancellation of indebtedness by
certain financial entities, by preparing any required tax and information
returns, in the form required.

          If the Trust Fund acquires any Mortgaged Property as aforesaid or
otherwise in connection with a default or imminent default on a Mortgage Loan,
the REO Property shall only be held temporarily, shall be actively marketed for
sale, and the Servicer shall dispose of the Mortgaged Property as soon as
practicable, and in any case before the end of the third calendar year following
the calendar year in which the Trust Fund acquires the property. Notwithstanding
any other provision of this Agreement, no Mortgaged Property acquired by the
Trust Fund shall be rented (or allowed to continue to be rented) or otherwise
used for the production of income by or on behalf of the Trust Fund.

         The decision of the Servicer to foreclose on a defaulted Mortgage Loan
shall be subject to a determination by the Servicer that the proceeds of the
foreclosure would exceed the costs and expenses of bringing a foreclosure
proceeding. The proceeds received from the maintenance of any REO Properties,
net of reimbursement to the Servicer for costs incurred (including any property
or other taxes) in connection with maintenance of the REO Properties and net of
unreimbursed Servicing Fees, Advances, and Servicing Advances, shall be applied
to the payment of principal of and interest on the related defaulted Mortgage
Loans (with interest accruing as though the Mortgage Loans were still current
and adjustments, if applicable, to the Mortgage Rate were being made in
accordance with the Mortgage Note) and all such proceeds shall be deemed, for
all purposes in this Agreement, to be payments on account of principal and
interest on the related Mortgage Notes and shall be deposited into the
Certificate Account. To the extent the net proceeds received during any calendar
month exceeds the amount attributable to amortizing principal and accrued
interest at the related Mortgage Rate on the related Mortgage Loan for the
calendar month, the excess shall be considered to be a partial prepayment of
principal of the related Mortgage Loan.

          The proceeds from any liquidation of a Mortgage Loan, as well as any
proceeds from an REO Property, will be applied in the following order of
priority: first, to reimburse the Servicer for any related unreimbursed
Servicing Advances or Servicing Fees or for any related unreimbursed Advances,
as applicable; second, to reimburse the Servicer, as applicable, and to
reimburse the Certificate Account for any Nonrecoverable Advances (or portions
thereof) that were previously withdrawn by the Servicer pursuant to Section
3.09(a)(iii) that related to the Mortgage Loan; third, to accrued and unpaid
interest (to the extent no Advance has been made for such amount or any such
Advance has been reimbursed) on the Mortgage Loan or related REO Property, at
the Adjusted Net Mortgage Rate to the Due Date occurring in the month in which
such amounts are required to be distributed; and fourth, as a recovery of
principal of the Mortgage Loan. The Servicer will retain any Excess Proceeds
from the liquidation of a Liquidated Mortgage Loan as additional servicing
compensation pursuant to Section 3.15.

         The Servicer may agree to a modification of any Mortgage Loan at the
request of the related Mortgagor if (i) the modification is in lieu of a
refinancing and (ii) the Servicer purchases that Mortgage Loan from the Trust
Fund as described below. Upon the agreement of the Servicer to modify a Mortgage
Loan in accordance with the preceding sentence, the Servicer shall purchase that
Mortgage Loan and all interest of the Trustee in that Mortgage Loan shall
automatically be deemed transferred and assigned to the Servicer and all
benefits and burdens of ownership thereof, including the right to accrued
interest thereon from the date of purchase and the risk of default thereon,
shall pass to the Servicer. The Servicer shall promptly deliver to the Trustee a
certification of a Servicing Officer to the effect that all requirements of this
paragraph have been satisfied with respect to a Mortgage Loan to be repurchased
pursuant to this paragraph.



                                       60
<PAGE>

         The Servicer shall deposit the Purchase Price for any Mortgage Loan
repurchased pursuant to Section 3.12 in the Certificate Account pursuant to
Section 3.06 within one Business Day after the purchase of the Mortgage Loan.
Upon receipt by the Trustee of written notification of any such deposit signed
by a Servicing Officer, the Trustee shall release to the Servicer the related
Mortgage File and shall execute and deliver such instruments of transfer or
assignment, in each case without recourse, as shall be necessary to vest in the
Servicer any Mortgage Loan previously transferred and assigned pursuant hereto.
The Servicer covenants and agrees to indemnify the Trust Fund against any
liability for any "prohibited transaction" taxes and any related interest,
additions, and penalties imposed on the Trust Fund established hereunder as a
result of any modification of a Mortgage Loan effected pursuant to this Section,
or any purchase of a Mortgage Loan by the Servicer in connection with a
modification (but such obligation shall not prevent the Servicer or any other
appropriate Person from contesting any such tax in appropriate proceedings and
shall not preven


 
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