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MORTGAGE LOAN PURCHASE AGREEMENT

Mortgage Loan Purchase Agreement

MORTGAGE LOAN PURCHASE AGREEMENT | Document Parties: COLUMN FINANCIAL, INC | CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES You are currently viewing:
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COLUMN FINANCIAL, INC | CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES

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Title: MORTGAGE LOAN PURCHASE AGREEMENT
Governing Law: New York     Date: 10/13/2006

MORTGAGE LOAN PURCHASE AGREEMENT, Parties: column financial  inc , credit suisse first boston mortgage securities
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                                                                    EXHIBIT 10.1

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              CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
                                    (Depositor)


                                       and


                             COLUMN FINANCIAL, INC.
                                    (Seller)


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



                         MORTGAGE LOAN PURCHASE AGREEMENT



                          Dated as of September 1, 2006


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








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<PAGE>



                                   TABLE OF CONTENTS


Section 1.      Transactions on or Prior to the Closing Date.....................
Section 2.      Closing Date Actions.............................................
Section 3.      Conveyance of Mortgage Loans.....................................
Section 4.      Depositor's Conditions to Closing................................
Section 5.      Seller's Conditions to Closing...................................
Section 6.      Representations and Warranties of Seller.........................
Section 7.      Obligations of Seller............................................
Section 8.      Crossed Mortgage Loans...........................................
Section 9.      Rating Agency Fees; Costs and Expenses Associated
               with a Defeasance................................................
Section 10.     Representations and Warranties of Depositor......................
Section 11.     Survival of Certain Representations, Warranties
               and Covenants....................................................
Section 12.     Transaction Expenses.............................................
Section 13.     Recording Costs and Expenses.....................................
Section 14.     Notices..........................................................
Section 15.     Notice of Exchange Act Reportable Events.........................
Section 16.     Examination of Mortgage Files....................................
Section 17.     Successors.......................................................
Section 18.     Governing Law....................................................
Section 19.     Severability.....................................................
Section 20.     Further Assurances...............................................
Section 21.     Counterparts.....................................................
Section 22.     Treatment as Security Agreement..................................

Schedule I      Schedule of Transaction Terms
Schedule II     Mortgage Loan Schedule for Column Loans
Schedule III    Mortgage Loans Constituting Mortgage Groups
Schedule IV     Mortgage Loans with Lost Mortgage Notes
Schedule V      Exceptions with Respect to Seller's Representations
               and Warranties

Exhibit A       Representations and Warranties of Seller Regarding the
               Mortgage Loans
Exhibit B       Form of Lost Mortgage Note Affidavit


<PAGE>



                        MORTGAGE LOAN PURCHASE AGREEMENT

              This Mortgage Loan Purchase Agreement (this "Agreement"), dated as
of September 1, 2006, is made by and between COLUMN FINANCIAL, INC., a Delaware
corporation ("Seller"), and CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES
CORP., a Delaware corporation ("Depositor").

                                     RECITALS

              I. Capitalized terms used herein without definition have the
meanings ascribed to them in the Schedule of Transaction Terms attached hereto
as Schedule I, which is incorporated herein by this reference, or, if not
defined therein or elsewhere in this Agreement, in the Pooling and Servicing
Agreement.

              II. On the Closing Date, and on the terms set forth herein, Seller
has agreed to sell to Depositor and Depositor has agreed to purchase from Seller
the mortgage loans identified on the schedule (the "Mortgage Loan Schedule")
annexed hereto as Schedule II (each such mortgage loan, a "Mortgage Loan" and,
collectively, the "Mortgage Loans"). Depositor intends to deposit the Mortgage
Loans and other assets into a trust fund (the "Trust Fund") created pursuant to
the Pooling and Servicing Agreement and to cause the issuance of the
Certificates.

                                    AGREEMENT

              NOW, THEREFORE, on the terms and conditions set forth below and
for good and valuable consideration, the receipt and adequacy of which is hereby
acknowledged, Depositor and Seller agree as follows:

              Section 1. Transactions on or Prior to the Closing Date. On or
prior to the Closing Date, Seller shall have delivered the Mortgage Files with
respect to each of the Mortgage Loans listed in the Mortgage Loan Schedule to
Wells Fargo Bank, N.A. as trustee (the "Trustee") or its designee, against
receipt by Seller of a trust receipt, pursuant to an arrangement between Seller
and the Trustee; provided, however, that item (p) in the definition of Mortgage
File (below) shall be delivered to the applicable Master Servicer for inclusion
in the Servicer File (defined below) with a copy delivered to the Trustee for
inclusion in the Mortgage File.

              Section 2. Closing Date Actions. The sale of the Mortgage Loans
shall take place on the Closing Date, subject to and simultaneously with the
deposit of the Mortgage Loans into the Trust Fund, the issuance of the
Certificates and the sale of (a) the Publicly Offered Certificates by Depositor
to the Underwriters pursuant to the Underwriting Agreement and (b) the Private
Certificates by Depositor to the Initial Purchaser pursuant to the Certificate
Purchase Agreement. The closing (the "Closing") shall take place at the offices
of Cadwalader, Wickersham & Taft LLP, One World Financial Center, New York, New
York 10281, or such other location as agreed upon between the parties hereto. On
the Closing Date, the following actions shall take place in sequential order on
the terms set forth herein:

              (i) Seller shall sell to Depositor, and Depositor shall purchase
       from Seller, the Mortgage Loans pursuant to this Agreement for the
       Mortgage Loan Purchase Price (as defined herein). The Mortgage Loan
       Purchase Price shall be paid by Depositor to Seller or at its direction
       by wire transfer in immediately available funds to an account designated
       by Seller on or prior to the Closing Date (or, by such other method as
       shall be mutually acceptable to Depositor and Seller). The "Mortgage Loan
       Purchase Price" paid by Depositor shall be equal to the amount that the
       Depositor and the Seller have mutually agreed upon as the Seller's share
       of the net securitization proceeds from the sale of the Publicly Offered
       Certificates and the Private Certificates as set forth in the Closing
       Statement (which amount includes, without limitation, accrued interest).

               (ii) Pursuant to the terms of the Pooling and Servicing Agreement,
       Depositor shall sell all of its right, title and interest in and to the
       Mortgage Loans to the Trustee for the benefit of the Holders of the
       Certificates.

               (iii) Depositor shall sell to the Underwriters, and the
       Underwriters shall purchase from Depositor, the Publicly Offered
       Certificates pursuant to the Underwriting Agreement, and Depositor shall
       sell to the Initial Purchaser, and the Initial Purchaser shall purchase
       from Depositor, the Private Certificates pursuant to the Certificate
       Purchase Agreement.

              (iv) The Underwriters will offer the Publicly Offered Certificates
       for sale to the public pursuant to the Prospectus and the Prospectus
       Supplement and the Initial Purchaser will privately place certain classes
       of the Private Certificates pursuant to the Offering Circular.

              Section 3. Conveyance of Mortgage Loans. On the Closing Date,
Seller shall sell, convey, assign and transfer, subject to any related servicing
rights of any applicable Master Servicer under, and/or any applicable Primary
Servicer contemplated by, the Pooling and Servicing Agreement, without recourse
except as provided herein, to Depositor, free and clear of any liens, claims or
other encumbrances, all of Seller's right, title and interest in, to and under:
(i) each of the Mortgage Loans identified on the Mortgage Loan Schedule, and
(ii) all property of Seller described in Section 21(b) of this Agreement,
including, without limitation, (A) all scheduled payments of interest and
principal due on or with respect to the Mortgage Loans after the Cut-off Date
and (B) all other payments of interest, principal or yield maintenance charges
received on or with respect to the Mortgage Loans after the Cut-off Date, other
than any such payments of interest or principal or yield maintenance charges
that were due on or prior to the Cut-off Date. The Mortgage File for each
Mortgage Loan shall contain the following documents on a collective basis:

              (a) the original Note (or with respect to those Mortgage Loans
listed in Schedule IV hereto, a "lost note affidavit" substantially in the form
of Exhibit B hereto and a true and complete copy of the Note), bearing, or
accompanied by, all prior and intervening endorsements, assignments or allonges
showing a complete chain of endorsement or assignment from the Mortgage Loan
Originator either in blank or to Seller, and further endorsed (at the direction
of Depositor given pursuant to this Agreement) by Seller, on its face or by
allonge attached thereto, without recourse, either in blank or to the order of
the Trustee in the following form: "Pay to the order of Wells Fargo Bank, N.A.,
as trustee for the registered Holders of Credit Suisse First Boston Mortgage
Securities Corp., Commercial Mortgage Pass-Through Certificates, Series 2006-C4,
without recourse, representation or warranty, express or implied";

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

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

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

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

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

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

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

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

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

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

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

              (m) with respect to any debt of a Borrower permitted under the
related Mortgage Loan, an original or copy of a subordination agreement,
standstill agreement or other intercreditor, co-lender or similar agreement
relating to such other debt, if any, including any mezzanine loan documents or
preferred equity documents, and a copy of the promissory note relating to such
other debt (if such other debt is also secured by the related Mortgage);

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

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

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

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

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

              (s) the original or copy of any property management agreement;

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

              (u) a checklist of the documents included in the subject Mortgage
File;

              (v) if applicable, the original or a counterpart of any
post-closing agreement relating to any modification, waiver or amendment of any
term of any Mortgage Loan (including fees charged the Borrower) required to be
added to the Mortgage File pursuant to Section 3.20(l) of the Pooling and
Servicing Agreement.


              Notwithstanding the foregoing, in the event that, in connection
with any Mortgage Loan, Seller cannot deliver, or cause to be delivered, an
original, counterpart or certified copy, as applicable, of any of the documents
and/or instruments required to be delivered pursuant to clauses (b), (d), (h),
(k) (other than assignments of UCC Financing Statements to be recorded or filed
in accordance with the transfer contemplated by this Agreement), (1) and (n)
(other than assignments of UCC Financing Statements to be recorded or filed in
accordance with the transfer contemplated by this Agreement) above and with
evidence of recording or filing thereon on the Closing Date, solely because of a
delay caused by the public recording or filing office where such document or
instrument has been delivered for recordation or filing, then the Seller: (i)
shall deliver, or cause to be delivered, to the Trustee or its designee a
duplicate original or true copy of such document or instrument certified by the
applicable public recording or filing office, the applicable title insurance
company or Seller to be a true and complete duplicate original or copy of the
original thereof submitted for recording or filing; and (ii) shall deliver, or
cause to be delivered, to the Trustee or its designee either the original of
such non-delivered document or instrument, or a photocopy thereof (certified by
the appropriate public recording or filing office to be a true and complete copy
of the original thereof submitted for recording or filing), with evidence of
recording or filing thereon (with a copy to the applicable Master Servicer),
within 120 days of the Closing Date, which period may be extended up to two
times, in each case for an additional period of 45 days (provided that Seller,
as certified in writing to the Trustee prior to each such 45-day extension, is
in good faith attempting to obtain from the appropriate county recorder's office
such original or photocopy). Compliance with this paragraph will satisfy
Seller's delivery requirements under this Section 3 with respect to the subject
document(s) and instrument(s).


              Notwithstanding the foregoing, in the event that, in connection
with any Mortgage Loan, Seller cannot deliver, or cause to be delivered, an
original, counterpart or certified copy, as applicable, of any of the documents
and/or instruments required to be delivered pursuant to clauses (b), (d), (h),
(k) (other than assignments of UCC Financing Statements to be recorded or filed
in accordance with the transfer contemplated by this Agreement), (1) and (n)
(other than assignments of UCC Financing Statements to be recorded or filed in
accordance with the transfer contemplated by this Agreement) above with evidence
of recording or filing thereon for any other reason, including without
limitation, that such non-delivered document or instrument has been lost, the
delivery requirements of this Agreement shall be deemed to have been satisfied
and such non-delivered document or instrument shall be deemed to have been
included in the related Mortgage File if a photocopy of such non-delivered
document or instrument (with evidence of recording or filing thereon and
certified by the appropriate recording or filing office to be a true and
complete copy of the original thereof as filed or recorded) is delivered to the
Trustee (with a copy to the applicable Master Servicer) on or before the Closing
Date.

              Notwithstanding the foregoing, in the event that Seller cannot
deliver any UCC Financing Statement assignment with the filing or recording
information of the related UCC Financing Statement with respect to any Mortgage
Loan, solely because such UCC Financing Statement has not been returned by the
public filing or recording office where such UCC Financing Statement has been
delivered for filing or recording, Seller shall so notify the Trustee and shall
not be in breach of its obligations with respect to such delivery, provided that
Seller promptly forwards such UCC Financing Statement to the Trustee (with a
copy to the applicable Master Servicer) upon its return, together with the
related original UCC Financing Statement assignment in a form appropriate for
filing or recording.

              Notwithstanding the foregoing, Seller may, at its sole cost and
expense, but is not obligated to, engage a third-party contractor to prepare or
complete in proper form for filing or recording any and all assignments of
Mortgage, assignments of Assignments of Leases and assignments of UCC Financing
Statements to the Trustee to be delivered pursuant to clauses (c), (e), (k), and
(n) above (collectively, the "Assignments"), to submit those Assignments for
filing and recording, as the case may be, in the applicable public filing and
recording offices and to deliver those Assignments to the Trustee (with a copy
to the applicable Master Servicer) or its designee as those Assignments (or
certified copies thereof) are received from the applicable filing and recording
offices with evidence of such filing or recording indicated thereon. However, in
the event Seller engages a third-party contractor as contemplated in the
immediately preceding sentence, the rights, duties and obligations of Seller
pursuant to this Agreement remain binding on Seller; and, if Seller does not
engage a third party as contemplated by the immediately preceding sentence, then
Seller will still be liable for recording and filing fees and expenses of the
Assignments as and to the extent contemplated by Section 13 hereof.

              Within ten (10) Business Days after the Closing Date, Seller shall
deliver the Servicer Files with respect to each of the Mortgage Loans to the
applicable Master Servicer (or, if applicable, to a Sub-Servicer (with a copy to
the applicable Master Servicer) at the direction of the applicable Master
Servicer), under the Pooling and Servicing Agreement on behalf of the Trustee in
trust for the benefit of the Certificateholders. Each such Servicer File shall
contain all documents and records in Seller's possession relating to such
applicable Mortgage Loans (including reserve and escrow agreements, cash
management agreements, lockbox agreements, rent rolls, leases, environmental and
engineering reports, third-party underwriting reports, appraisals, surveys,
legal opinions, estoppels, financial statements, operating statements and any
other information provided by the respective Borrower from time to time, but
excluding any draft documents, attorney/client communications, which are
privileged or constitute legal or other due diligence analyses, and documents
prepared by Seller or any of its Affiliates solely for internal communication,
credit underwriting or due diligence analyses (other than the underwriting
information contained in the related underwriting memorandum or asset summary
report prepared by the Seller in connection with the preparation of Exhibit A-1
to the Prospectus Supplement)) that are not required to be a part of a Mortgage
File in accordance with the definition thereof, together with copies of all
instruments and documents which are required to be a part of the related
Mortgage File in accordance with the definition thereof.

              In addition, with respect to each Mortgage Loan as to which any
Additional Collateral is in the form of a letter of credit as of the Closing
Date, the Seller (within 30 days after the Closing Date) shall cause to be
prepared, executed and delivered to the issuer of each such letter of credit
such notices, assignments and acknowledgements as are required under such letter
of credit to assign, without recourse, to, and vest in, the Trustee (in care of
the applicable Master Servicer) (whether by actual assignment or by amendment of
the letter of credit) the Seller's rights as the beneficiary thereof and drawing
party thereunder. The designated beneficiary under each letter of credit
referred to in the preceding sentence shall be the Trustee (in care of the
applicable Master Servicer).

              For purposes of this Section 3, and notwithstanding any contrary
provision hereof or of the definition of "Mortgage File," if there exists with
respect to any group of Crossed Mortgage Loans only one original or certified
copy of any document or instrument described in the definition of "Mortgage
File" which pertains to all of the Crossed Mortgage Loans in such group of
Crossed Mortgage Loans, the inclusion of the original or certified copy of such
document or instrument in the Mortgage File for any of such Crossed Mortgage
Loans and the inclusion of a copy of such original or certified copy in each of
the Mortgage Files for the other Crossed Mortgage Loans in such group of Crossed
Mortgage Loans, shall be deemed the inclusion of such original or certified
copy, as the case may be, in the Mortgage File for each such Crossed Mortgage
Loan.

              Seller shall, promptly after the Closing Date, but in all events
within three (3) Business Days after the Closing Date, cause all funds on
deposit in escrow accounts maintained with respect to the Mortgage Loans in the
name of Seller or any other name, to be transferred to or at the direction of
the applicable Master Servicer (or, if applicable, to a Sub-Servicer at the
direction of the applicable Master Servicer) for deposit into Servicing
Accounts.

              The Trustee, as assignee or transferee of Depositor, shall be
entitled to all scheduled principal payments due after the Cut-off Date, all
other payments of principal due and collected after the Cut-off Date, and all
payments of interest on the Mortgage Loans, minus that portion of any such
payment which is allocable to the period on or prior to the Cut-off Date. All
scheduled payments of principal due on or before the Cut-off Date and collected
after the Cut-off Date, together with the accompanying interest payments, shall
belong to Seller.

              Upon the sale of the Mortgage Loans from Seller to Depositor
pursuant hereto, the ownership of each Note, the related Mortgage Loan and the
contents of the related Mortgage File shall be vested in Depositor and the
ownership of all records and documents with respect to the related Mortgage Loan
prepared by or which come into the possession of Seller as seller of the
Mortgage Loans hereunder, exclusive in each case of records and documents that
are not required to be delivered hereunder by Seller, shall immediately vest in
Depositor. All Monthly Payments, Principal Prepayments and other amounts
received by Seller and not otherwise belonging to Seller pursuant to this
Agreement shall be sent by Seller within three (3) Business Days after Seller's
receipt thereof to the applicable Master Servicer via wire transfer for deposit
by the applicable Master Servicer into the Collection Account.

              Upon the sale of Certificates representing at least 10% of the
fair value of all the Certificates to unaffiliated third parties, Seller shall,
under generally accepted accounting principles ("GAAP"), report its transfer of
the Mortgage Loans to Depositor, as provided herein, as a sale of the Mortgage
Loans to Depositor in exchange for the consideration specified in Section 2
hereof. In connection with the foregoing, upon sale of Certificates representing
at least 10% of the fair value of all the Certificates to unaffiliated third
parties, Seller shall cause all of its financial and accounting records to
reflect such transfer as a sale (as opposed to a secured loan). Regardless of
its treatment of the transfer of the Mortgage Loans to the Depositor under GAAP,
Seller shall at all times following the Closing Date cause all of its records
and financial statements and any relevant consolidated financial statements of
any direct or indirect parent to clearly reflect that the Mortgage Loans have
been transferred to Depositor and are no longer available to satisfy claims of
Seller's creditors.

              After Seller's transfer of the Mortgage Loans to Depositor, as
provided herein, Seller shall not take any action inconsistent with Depositor's
ownership (or the ownership by any of Depositor's assignees) of the Mortgage
Loans. Except for actions that are the express responsibility of another party
hereunder or under the Pooling and Servicing Agreement, and further except for
actions that Seller is expressly permitted to complete subsequent to the Closing
Date, Seller shall, on or before the Closing Date, take all actions required
under applicable law to effectuate the transfer of the Mortgage Loans by Seller
to Depositor.

              Section 4. Depositor's Conditions to Closing. The obligations of
Depositor to purchase the Mortgage Loans and pay the Mortgage Loan Purchase
Price at the Closing Date under the terms of this Agreement are subject to the
satisfaction of each of the following conditions at or before the Closing:

              (a) Each of the obligations of Seller required to be performed by
it on or prior to the Closing Date pursuant to the terms of this Agreement shall
have been duly performed and complied with in all material respects; all of the
representations and warranties of Seller under this Agreement (subject to the
exceptions set forth in the Exception Report) shall be true and correct in all
material respects as of the Closing Date; no event shall have occurred with
respect to Seller or any of the Mortgage Loans and related Mortgage Files which,
with notice or the passage of time, would constitute a material default under
this Agreement; and Depositor shall have received certificates to the foregoing
effect signed by authorized officers of Seller.

              (b) Depositor, or if directed by Depositor, the Trustee or
Depositor's attorneys or other designee, shall have received in escrow, all of
the following closing documents, in such forms as are agreed upon and reasonably
acceptable to Depositor and Seller, duly executed by all signatories other than
Depositor, as required pursuant to the respective terms thereof:

              (i) the Mortgage Files, subject to the provisos of Section 1 of
       this Agreement, which shall have been delivered to and held by the
       Trustee or its designee on behalf of Seller;

              (ii) the Mortgage Loan Schedule;

              (iii) the certificate of Seller confirming its representations and
       warranties set forth in Section 6(a) (subject to the exceptions set forth
       in the Exception Report) as of the Closing Date;

              (iv) an opinion or opinions of Seller's counsel, dated the Closing
       Date, covering various corporate matters and such other matters as shall
       be reasonably required by Depositor;

              (v) such other certificates of Seller's officers or others and
       such other documents to evidence fulfillment of the conditions set forth
       in this Agreement as Depositor or its counsel may reasonably request; and

              (vi) all other information, documents, certificates, or letters
       with respect to the Mortgage Loans or Seller and its Affiliates as are
       reasonably requested by Depositor in order for Depositor to perform any
       of it obligations or satisfy any of the conditions on its part to be
       performed or satisfied pursuant to any sale of Mortgage Loans by
       Depositor as contemplated herein.

              (c) Seller shall have performed or complied with all other terms
and conditions of this Agreement which it is required to perform or comply with
at or before the Closing and shall have the ability to perform or comply with
all duties, obligations, provisions and terms which it is required to perform or
comply with after the Closing.

              (d) Seller shall have delivered to the Trustee, on or before the
Closing Date, five (5) limited powers of attorney in favor of the Trustee and
Special Servicer empowering the Trustee and, in the event of the failure or
incapacity of the Trustee, the Special Servicer, to record, at the expense of
Seller, any Mortgage Loan Documents required to be recorded and any intervening
assignments with evidence of recording thereon that are required to be included
in the Mortgage Files. Seller shall reasonably cooperate with the Trustee or the
applicable Special Servicer after the Closing Date, the Seller shall deliver to
the Trustee or the applicable Special Servicer, as applicable, the powers of
attorney described in the prior sentence in form and substance reasonably
acceptable to the requesting party.

              (e) The Seller shall have paid or caused to be paid upfront all
the annual fees of each Rating Agency allocable to the Mortgage Loans.

              Section 5. Seller's Conditions to Closing. The obligations of
Seller under this Agreement shall be subject to the satisfaction, on the Closing
Date, of the following conditions:

              (a) Each of the obligations of Depositor required to be performed
by it on or prior to the Closing Date pursuant to the terms of this Agreement,
including, without limitation, payment of the Mortgage Loan Purchase Price,
shall have been duly performed and complied with in all material respects; and
all of the representations and warranties of Depositor under this Agreement
shall be true and correct in all material respects as of the Closing Date; and
no event shall have occurred with respect to Depositor which, with notice or the
passage of time, would constitute a material default under this Agreement, and
Seller shall have received certificates to that effect signed by authorized
officers of Depositor.

              (b) Seller shall have received all of the following closing
documents, in such forms as are agreed upon and reasonably acceptable to Seller
and Depositor, duly executed by all signatories other than Seller, as required
pursuant to the respective terms thereof:

                  (i) an officer's certificate of Depositor, dated as of the
       Closing Date, with the resolutions of Depositor authorizing the
       transactions set forth therein, together with copies of the charter,
       by-laws and certificate of good standing dated as of a recent date of
       Depositor; and

                  (ii) such other certificates of its officers or others, such
       opinions of Depositor's counsel and such other documents required to
       evidence fulfillment of the conditions set forth in this Agreement as
       Seller or its counsel may reasonably request.

              (c) Depositor shall have performed or complied with all other
terms and conditions of this Agreement which it is required to perform or comply
with at or before the Closing and shall have the ability to perform or comply
with all duties, obligations, provisions and terms which it is required to
perform or comply with after Closing.

              Section 6. Representations and Warranties of Seller.

              (a) Seller represents and warrants to Depositor as of the date
hereof, as follows:

                  (i) Seller is duly organized and is validly existing as a
       corporation in good standing under the laws of the State of Delaware.
        Seller has conducted and is conducting its business so as to comply in
       all material respects with all applicable statutes and regulations of
       regulatory bodies or agencies having jurisdiction over it, except where
       the failure so to comply would not have a materially adverse effect on
       the performance by Seller of this Agreement, and there is no charge,
       action, suit or proceeding before or by any court, regulatory authority
       or governmental agency or body pending or, to the knowledge of Seller,
       threatened, which is reasonably likely to materially and adversely affect
       the performance by Seller of this Agreement or the consummation of
       transactions contemplated by this Agreement.

                   (ii) Seller has the full power, authority and legal right to
       hold, transfer and convey the Mortgage Loans and to execute and deliver
       this Agreement (and all agreements and documents executed and delivered
       by Seller in connection herewith) and to perform all transactions of
       Seller contemplated by this Agreement (and all agreements and documents
       executed and delivered by Seller in connection herewith). Seller has duly
       authorized the execution, delivery and performance of this Agreement (and
       all agreements and documents executed and delivered by Seller in
       connection herewith), and has duly executed and delivered this Agreement
       (and all agreements and documents executed and delivered by Seller in
        connection herewith). This Agreement (and each agreement and document
       executed and delivered by Seller in connection herewith), assuming due
       authorization, execution and delivery thereof by each other party
       thereto, constitutes the legal, valid and binding obligation of Seller
       enforceable in accordance with its terms, except as such enforcement may
       be limited by bankruptcy, fraudulent transfer, insolvency,
       reorganization, receivership, moratorium or other laws relating to or
       affecting the rights of creditors generally, by general principles of
       equity (regardless of whether such enforcement is considered in a
       proceeding in equity or at law) and by considerations of public policy.

                   (iii) Neither the execution, delivery and performance of this
       Agreement, nor the fulfillment of or compliance with the terms and
       conditions of this Agreement by Seller, will (A) conflict with or result
       in a breach of any of the terms, conditions or provisions of Seller's
       articles or certificate of incorporation and bylaws or similar type
       organizational documents, as applicable; (B) conflict with, result in a
       breach of, or constitute a default or result in an acceleration under,
       any agreement or instrument to which Seller is now a party or by which it
       (or any of its properties) is bound if compliance therewith is necessary
       (1) to ensure the enforceability of this Agreement or (2) for Seller to
       perform its duties and obligations under this Agreement (or any agreement
       or document executed and delivered by Seller in connection herewith); (C)
       conflict with or result in a breach of any legal restriction if
       compliance therewith is necessary (1) to ensure the enforceability of
       this Agreement or (2) for Seller to perform its duties and obligations
       under this Agreement (or any agreement or document executed and delivered
       by Seller in connection herewith); (D) result in the violation of any
       law, rule, regulation, order, judgment or decree to which Seller or its
       property is subject if compliance therewith is necessary (1) to ensure
       the enforceability of this Agreement or (2) for Seller to perform its
       duties and obligations under this Agreement (or any agreement or document
       executed and delivered by Seller in connection herewith); or (E) result
       in the creation or imposition of any lien, charge or encumbrance that
        would have a material adverse effect upon Seller's ability to perform its
       duties and obligations under this Agreement (or any agreement or document
       executed and delivered by Seller in connection herewith), or materially
       impair the ability of Depositor to realize on the Mortgage Loans owned by
       Seller.

                  (iv) Seller is solvent and the sale of the Mortgage Loans (1)
       will not cause Seller to become insolvent and (2) is not intended by
       Seller to hinder, delay or defraud any of its present or future
       creditors. After giving effect to its transfer of the Mortgage Loans, as
       provided herein, the value of Seller's assets, either taken at their
       present fair saleable value or at fair valuation, will exceed the amount
       of Seller's debts and obligations, including contingent and unliquidated
       debts and obligations of Seller, and Seller will not be left with
       unreasonably small assets or capital with which to engage in and conduct
       its business. Seller does not intend to, and does not believe that it
       will, incur debts or obligations beyond its ability to pay such debts and
       obligations as they mature. No proceedings looking toward liquidation,
       dissolution or bankruptcy of Seller are pending or contemplated.

                  (v) No consent, approval, authorization or order of, or
       registration or filing with, or notice to, any court or governmental
       agency or body having jurisdiction or regulatory authority over Seller is
       required for (A) Seller's execution, delivery and performance of this
       Agreement (or any agreement or document executed and delivered by Seller
       in connection herewith), (B) Seller's transfer and assignment of the
       Mortgage Loans, or (C) the consummation by Seller of the transactions
       contemplated by this Agreement (or any agreement or document executed and
       delivered by Seller in connection herewith) or, to the extent so
       required, such consent, approval, authorization, order, registration,
       filing or notice has been obtained, made or given (as applicable), except
       for the filing or recording of assignments and other Mortgage Loan
       Documents contemplated by the terms of this Agreement and except that
       Seller may not be duly qualified to transact business as a foreign
       corporation or licensed in one or more states if such qualification or
       licensing is not necessary to ensure the enforceability of this Agreement
       (or any agreement or document executed and delivered by Seller in
       connection herewith).

                  (vi) In connection with its sale of the Mortgage Loans, Seller
       is receiving new value. The consideration received by Seller upon the
       sale of the Mortgage Loans owned by it constitutes at least fair
       consideration and reasonably equivalent value for the Mortgage Loans.

                  (vii) Seller does not believe, nor does it have any reason or
        cause to believe, that it cannot perform each and every covenant of
       Seller contained in this Agreement (or any agreement or document executed
       and delivered by Seller in connection herewith).

                  (viii) There are no actions, suits or proceedings pending or,
       to Seller's knowledge, threatened in writing against Seller which are
       reasonably likely to draw into question the validity of this Agreement
       (or any agreement or document executed and delivered by Seller in
       connection herewith) or which, either in any one instance or in the
       aggregate, are reasonably likely to materially impair the ability of
       Seller to perform its duties and obligations under this Agreement (or any
       agreement or document executed and delivered by Seller in connection
       herewith).

                  (ix) Seller's performance of its duties and obligations under
       this Agreement (and each agreement or document executed and delivered by
       Seller in connection herewith) is in the ordinary course of business of
       Seller and Seller's transfer, assignment and conveyance of the Mortgage
       Loans pursuant to this Agreement are not subject to the bulk transfer or
       similar statutory provisions in effect in any applicable jurisdiction.
       The Mortgage Loans do not constitute all or substantially all of Seller's
       assets.

                  (x) Seller has not dealt with any Person that may be entitled,
       by reason of any act or omission of Seller, to any commission or
       compensation in connection with the sale of the Mortgage Loans to
       Depositor hereunder except for (A) the reimbursement of expenses as
       described herein or otherwise in connection with the transactions
        described in Section 2 hereof and (B) the commissions or compensation
       owed to the Underwriters or the Initial Purchaser.

                  (xi) Seller is not in default or breach of any agreement or
       instrument to which Seller is now a party or by which it (or any of its
       properties) is bound which breach or default would materially and
       adversely affect the ability of Seller to perform its obligations under
       this Agreement.

                  (xii) The representations and warranties contained in Exhibit
       A hereto, subject to the exceptions to such representations and
       warranties set forth on Schedule V hereto, are true and correct in all
       material respects as of the date hereof with respect to the Mortgage
       Loans identified on Schedule II.

                  (xiii) The information set forth in any Disclosure Information
       (as defined in the Column Financial, Inc. Indemnification Agreement), as
       last forwarded to each prospective investor at or prior to the date on
       which a contract for sale was entered into with such prospective
       investor, (i) does not contain any untrue statement of a material fact or
       omit to state any material fact necessary to make the statements therein,
       in light of the circumstances under which they were made, not misleading
       and (ii) complies with the requirements of and contains all of the
       applicable information required by Regulation AB (as defined in the
       Column Financial, Inc. Indemnification Agreement); but only to the extent
       that (i) such information regards the Mortgage Loans and is contained in
       the Loan Detail (as defined in the Column Financial, Inc. Indemnification
       Agreement) or, to the extent consistent therewith, the Diskette (as
       defined in the Column Financial, Inc. Indemnification Agreement) or (ii)
       such information regarding the Seller or the Mortgage Loans was contained
       in the Confidential Offering Circular or the Prospectus Supplement under
       the headings "Summary of Prospectus Supplement--Relevant
       Parties/Entities," "--Sponsors and Mortgage Loan Sellers,"
       "--Originators," "--The Underlying Mortgage Loans," "--Source of the
       Underlying Mortgage Loans," "Risk Factors," "Description of the Sponsors
       and Mortgage Loan Sellers" "Description of the Underlying Mortgage Loans"
       and "--Significant Mortgage Loans" and such information does not
       represent an incorrect restatement or an incorrect aggregation of correct
       information regarding the Mortgage Loans contained in the Loan Detail.

              (b) Seller hereby agrees that it shall be deemed to make, as of
the date of substitution, to and for the benefit of the Trustee as the holder of
the Mortgage Loan to be replaced, with respect to any replacement mortgage loan
(a "Replacement Mortgage Loan") that is substituted for a Mortgage Loan affected
by a Material Defect or a Material Breach, pursuant to Section 7 of this
Agreement, each of the representations and warranties set forth in Exhibit A
hereto (references therein to "Closing Date" being deemed to be references to
the "date of substitution" and references therein to "Cut-off Date" being deemed
to be references to the "most recent due date for the subject Replacement
Mortgage Loan on or before the date of substitution"). From and after the date
of substitution, each Replacement Mortgage Loan, if any, shall be deemed to
constitute a "Mortgage Loan" hereunder for all purposes.

              Section 7. Obligations of Seller. Each of the representations and
warranties contained in or required to be made by Seller pursuant to Section 6
of this Agreement shall survive the sale of the Mortgage Loans and shall
continue in full force and effect, notwithstanding any restrictive or qualified
endorsement on the Notes and notwithstanding subsequent termination of this
Agreement or the Pooling and Servicing Agreement. The representations and
warranties contained in or required to be made by Seller pursuant to Section 6
of this Agreement shall not be impaired by any review or examination of the
Mortgage Files or other documents evidencing or relating to the Mortgage Loans
or any failure on the part of Depositor to review or examine such documents and
shall inure to the benefit of the initial transferee of the Mortgage Loans from
Depositor including, without limitation, the Trustee for the benefit of the
Holders of the Certificates, notwithstanding (1) any restrictive or qualified
endorsement on any Note, assignment of Mortgage or reassignment of Assignment of
Leases or (2) any termination of this Agreement prior to the Closing, but shall
not inure to the benefit of any subsequent transferee thereafter.

              If Seller receives notice of a breach of any of the
representations or warranties made by Seller with respect to the Mortgage Loans,
as of the date hereof in Section 6(a)(xii) or as of the Closing Date pursuant to
Section 4(b)(iii) (in either case, subject to the exceptions to such
representations and warranties set forth in the Exception Report) or with
respect to any Replacement Mortgage Loan, as of the date of substitution
pursuant to Section 6(b) (in any such case, a "Breach"), or receives notice that
(a) any document required to be included in the Mortgage File related to any
Mortgage Loan is not in the Trustee's (or its designee's) possession within the
time period required herein or (b) such document has not been properly executed
or is otherwise defective on its face (clause (a) and clause (b) each, a
"Defect" (which term shall include the "Defects" detailed in the immediately
following paragraph) in the related Mortgage File), and if such Breach or
Defect, as the case may be, materially and adversely affects or is deemed hereby
to materially and adversely affect, the value of the related Mortgage Loan or
any successor REO Loan or the interests of any class of Certificateholders (any
Breach or Defect that materially and adversely affects the value of the related
Mortgage Loan or the interests of any class of Certificateholders, a "Material
Breach" or a "Material Defect," respectively), then the Seller shall, upon
written request of Depositor, the Trustee, the applicable Master Servicer or the
applicable Special Servicer, not later than 90 days after the receipt by Seller
of such written request (subject to the second succeeding paragraph, the
"Initial Resolution Period"): (i) cure such Material Breach or Material Defect,
as the case may be, in all material respects; (ii) repurchase the affected
Mortgage Loan at the applicable Purchase Price (as defined in the Pooling and
Servicing Agreement); or (iii) substitute, in accordance with the Pooling and
Servicing Agreement, one or more Qualified Substitute Mortgage Loans (as defined
in the Pooling and Servicing Agreement) for such affected Mortgage Loan
(provided that in no event shall any substitution occur later than the second
anniversary of the Closing Date) and pay the applicable Master Servicer for
deposit into the applicable Collection Account any Substitution Shortfall Amount
(as defined in the Pooling and Servicing Agreement) in connection therewith;
provided, however, that if (i) such Material Breach or Material Defect is
capable of being cured but not within the Initial Resolution Period, (ii) such
Material Breach or Material Defect does not cause the related Mortgage Loan not
to be a "qualified mortgage" (within the meaning of Section 860G(a)(3) of the
Code), (iii) Seller has commenced and is diligently proceeding with the cure of
such Material Breach or Material Defect within the Initial Resolution Period and
(iv) Seller has delivered to the Rating Agencies, the applicable Master
Servicer, the applicable Special Servicer and the Trustee an Officer's
Certificate that describes the reasons that the cure was not effected within the
Initial Resolution Period and the actions that it proposes to take to effect the
cure and that states that it anticipates the cure will be effected within the
additional 90-day period, then Seller shall have an additional 90 days to cure
such Material Defect or Material Breach. If any Breach pertains to a
representation or warranty that the related Mortgage Loan Documents or any
particular Mortgage Loan Document requires the related Borrower to bear the
costs and expenses associated with any particular action or matter under such
Mortgage Loan Document(s), then Seller shall cure such Breach within the Initial
Resolution Period by reimbursing the Trust Fund (by wire transfer of immediately
available funds) the reasonable amount of any such costs and expenses incurred
by the applicable Master Servicer, the applicable Special Servicer, the Trustee
or the Trust Fund that are the basis of such Breach and have not been reimbursed
by the related Borrower; provided, however, that in the event any such costs and
expenses exceed $10,000, Seller shall have the option to either repurchase the
related Mortgage Loan at the applicable Purchase Price, replace such Mortgage
Loan and pay any applicable Substitution Shortfall Amount or pay such costs and
expenses. Except as provided in the proviso to the immediately preceding
sentence, Seller shall remit the amount of such costs and expenses and upon its
making such remittance, Seller shall be deemed to have cured such Breach in all
respects. Provided such payment is made, the second preceding sentence describes
the sole remedy available to the Certificateholders and the Trustee on their
behalf regarding any such Breach, and Seller shall not be obligated to
repurchase, substitute or otherwise cure such Breach under any circumstances.
With respect to any repurchase of a Mortgage Loan hereunder or any substitution
of one or more Qualified Substitute Mortgage Loans for a Mortgage Loan
hereunder, (A) no such substitution may be made in any calendar month after the
Determination Date for such month; (B) scheduled payments of principal and
interest due with respect to the Qualified Substitute Mortgage Loan(s) after the
month of substitution, and scheduled payments of principal and interest due with
respect to each Mortgage Loan being repurchased or replaced after the related
Cut-off Date and received by the applicable Master Servicer or the applicable
Special Servicer on behalf of the Trust on or prior to the related date of
repurchase or substitution, shall be part of the Trust Fund; and (C) scheduled
payments of principal and interest due with respect to each such Qualified
Substitute Mortgage Loan on or prior to the Due Date in the month of
substitution, and scheduled payments of principal and interest due with respect
to each Mortgage Loan being repurchased or replaced and received by the
applicable Master Servicer or the applicable Special Servicer on behalf of the
Trust after the related date of repurchase or substitution, shall not be part of
the Trust Fund, and Seller (or, if applicable, any person effecting the related
repurchase or substitution in the place of Seller) shall be entitled to receive
such payments promptly following receipt by the applicable Master Servicer or
the applicable Special Servicer, as applicable, under the Pooling and Servicing
Agreement.

              Any of the following will cause a document in the Mortgage File to
be deemed to have a "Material Defect": (a) the absence from the Mortgage File of
the original signed Note, unless the Mortgage File contains a signed lost note
affidavit and indemnity; (b) the absence from the Mortgage File of the original
signed Mortgage, unless there is included in the Mortgage File a certified copy
of the Mortgage as recorded or as sent for recordation, together with a
certificate stating that the original signed Mortgage was sent for recordation,
or a copy of the Mortgage and the related recording information; (c) the absence
from the Mortgage File of the item called for by clause (i) of the definition of
Mortgage File in Section 3; (d) the absence from the Mortgage File of any
intervening assignments required to create an effective assignment to the
Trustee on behalf of the Trust, unless there is included in the Mortgage File a
certified copy of the intervening assignment as recorded or as sent for
recordation, together with a certificate stating that the original intervening
assignment was sent for recordation, or a copy of the intervening assignment and
the related recording information; or (e) the absence from the Mortgage File of
any required original letter of credit (unless such original has been delivered
to the applicable Master Servicer and copy thereof is part of the Mortgage
File), provided that such Defect may be cured by any substitute letter of credit
or cash reserve on behalf of the related Borrower; or (f) the absence from the
Mortgage File of the original or a copy of any required ground lease.
Notwithstanding anything herein to the contrary, the failure to include a
document checklist in a Mortgage File shall in no event constitute a Material
Defect.

              Any Defect or Breach which causes any Mortgage Loan not to be a
"qualified mortgage" (within the meaning of Section 860G(a)(3) of the Code)
shall be deemed a "Material Defect" or "Material Breach," as applicable, and the
Initial Resolution Period for the affected Mortgage Loan shall be 90 days
following the earlier of Seller's receipt of notice pursuant to this Section 7
or its discovery of such Defect or Breach (which period shall not be subject to
extension).

              If Seller does not, as required by this Section 7, correct or cure
a Material Breach or a Material Defect in all material respects within the
applicable Initial Resolution Period (as extended pursuant to this Section 7),
or if such Material Breach or Material Defect is not capable of being so
corrected or cured within such period, then Seller shall repurchase or
substitute for the affected Mortgage Loan as provided in this Section 7. If (i)
any Mortgage Loan is required to be repurchased or substituted for as provided
above, (ii) such Mortgage Loan is a Crossed Mortgage Loan that is a part of a
Mortgage Group (as defined below) and (iii) the applicable Breach or Defect does
not constitute a Breach or Defect, as the case may be, as to any other Crossed
Mortgage Loan in such Mortgage Group (without regard to this paragraph), then
the applicable Breach or Defect, as the case may be, will be deemed to
constitute a Breach or Defect, as the case may be, as to any other Crossed
Mortgage Loan in the Mortgage Group for purposes of the above provisions, and
Seller will be required to repurchase or substitute for such other Crossed
Mortgage Loan(s) in the related Mortgage Group in accordance with the provisions
of this Section 7 unless the Crossed Mortgage Loan Repurchase Criteria would be
satisfied if Seller were to repurchase or substitute for only the affected
Crossed Mortgage Loans as to which a Material Breach or Material Defect had
occurred without regard to this paragraph, and in the case of either such
repurchase or substitution, all of the other requirements set forth in the
Pooling and Servicing Agreement applicable to a repurchase or substitution, as
the case may be, would be so satisfied. In the event that one or more of such
other Crossed Mortgage Loans satisfy the Crossed Mortgage Loan Repurchase
Criteria, Seller may elect either to repurchase or substitute for only the
affected Crossed Mortgage Loan as to which the related Breach or Defect exists
or to repurchase or substitute for all of the Crossed Mortgage Loans in the
related Mortgage Group. Seller shall be responsible for the cost of any
Appraisal required to be obtained by the applicable Master Servicer to determine
if the Crossed Mortgage Loan Repurchase Criteria have been satisfied, so long as
the scope and cost of such Appraisal has been approved by Seller (such approval
not to be unreasonably withheld). For purposes of this paragraph, a "Mortgage
Group" is any group of Mortgage Loans identified as a Mortgage Group on Schedule
III to this Agreement.

              Notwithstanding the foregoing, if there is a Material Breach or
Material Defect with respect to one or more Mortgaged Properties (but not all of
the Mortgaged Properties) with respect to a Mortgage Loan, Seller will not be
obligated to repurchase or substitute for the entire Mortgage Loan if the
affected Mortgaged Property may, pursuant to the partial release provisions in
the related Mortgage Loan Documents, be released and the Mortgaged Property
remaining after such release satisfies the requirements, if any, set forth in
the Mortgage Loan Documents and (i) Seller provides an opinion of counsel to the
effect that such partial release would not cause an Adverse REMIC Event (as
defined in the Pooling and Servicing Agreement) to occur, (ii) Seller pays (or
causes to be paid) the applicable release price required under the Mortgage Loan
Documents and, to the extent not reimbursable out of the release price pursuant
to the related Mortgage Loan Documents, any additional amounts necessary to
cover all reasonable out-of-pocket expenses reasonably incurred by the
applicable Master Servicer, the applicable Special Servicer, the Trustee or the
Trust Fund in connection therewith, including any unreimbursed advances and
interest thereon made with respect to the Mortgaged Property that is being
released and (iii) such cure by release of such Mortgaged Property is effected
within the time periods specified for cure of a Material Breach or Material
Defect in this Section 7.

              The Purchase Price or Substitution Shortfall Amount for any
repurchased or substituted Mortgage Loan shall be payable to Depositor or,
subsequent to the assignment of the Mortgage Loans to the Trustee, the Trustee
as its assignee, by wire transfer of immediately available funds to the account
designated by Depositor or the Trustee, as the case may be, and Depositor or the
Trustee, as the case may be, upon receipt of such funds (and, in the case of a
substitution, the Mortgage File(s) for the related Qualified Substitute Mortgage
Loans(s)), shall promptly release the related Mortgage File and Servicer File
(and all other documents pertaining to such Mortgage Loan possessed by the
Depositor or the Trustee, as applicable, or on its behalf, but excluding any
draft documents, attorney/client privileged communications and documents
prepared by the Depositor or the Trustee (or by the Master Servicer or the
Special Servicer on behalf of the Trust), as applicable, or any of its
Affiliates solely for internal communication) or cause them to be released, to
Seller and shall execute and deliver such instruments of transfer, endorsement
or assignment as shall be necessary to vest in Seller the legal and beneficial
ownership of such Mortgage Loan (including any property acquired in respect
thereof or proceeds of any insurance policy with respect thereto) and the
related Mortgage Loan Documents and shall deliver to Seller any escrow payments
and reserve funds held by it, or on its behalf, with respect to such repurchased
or replaced Mortgage Loan.

              It is understood and agreed that the obligations of Seller set
forth in this Section 7 constitute the sole remedies available to Depositor and
its successors and assigns against Seller respecting any Breach or Defect
affecting a Mortgage Loan.

              Section 8. Crossed Mortgage Loans. With respect to any Crossed
Mortgage Loan conveyed hereunder, to the extent that Seller repurchases or
substitutes for an affected Crossed Mortgage Loan in the manner prescribed above
while the Trustee continues to hold any related Crossed Mortgage Loans, Seller
and Depositor (on behalf of its successors and assigns) agree to modify upon
such repurchase or substitution, the related Mortgage Loan Documents in a manner
such that such affected Crossed Mortgage Loan repurchased or substituted by
Seller, on the one hand, and any related Crossed Mortgage Loans still held by
the Trustee, on the other, would no longer be cross-defaulted or
cross-collateralized with one another; provided that Seller shall have furnished
the Trustee, at Seller's expense, with an Opinion of Counsel that such
modification shall not cause an Adverse REMIC Event; and provided, further, that
if such Opinion of Counsel cannot be furnished, Seller and Depositor hereby
agree that such repurchase or substitution of only the affected Crossed Mortgage
Loans, notwithstanding anything to the contrary herein, shall not be permitted.
Any reserve or other cash collateral or letters of credit securing the subject
Crossed Mortgage Loans shall be allocated between such Mortgage Loans in
accordance with the Mortgage Loan Documents. All other terms of the Mortgage
Loans shall remain in full force and effect, without any modification thereof.

              Section 9. Rating Agency Fees; Costs and Expenses Associated with
a Defeasance. The Seller shall pay all Rating Agency fees associated with an
assumption of a Mortgage Loan to the extent such fees have not been paid by the
related Borrower and such Borrower is not required to pay them under the terms
of the related Mortgage Loan Documents in effect on or before the Closing Date,
the payment of which fees shall constitute the sole remedy of any breach by a
Seller of representation (xxviii)(1) set forth on Exhibit A hereto unless the
Seller elects to repurchase or substitute for such Mortgage Loan in accordance
with the second paragraph of Section 7. The Seller shall pay all reasonable
costs and expenses associated with a defeasance of a Mortgage Loan to the extent
such costs and expenses have not been paid by the related Borrower and such
Borrower is not required to pay them under the terms of the related Mortgage
Loan Documents in effect on or before the Closing Date, the payment of which
fees shall constitute the sole remedy of any breach by a Seller of
representation (liv)(F) set forth on Exhibit A hereto unless the Seller elects
to repurchase or substitute for such Mortgage Loan in accordance with the second
paragraph of Section 7.

              Section 10. Representations and Warranties of Depositor. Depositor
hereby represents and warrants to Seller as of the date hereof, as follows:

              (a) Depositor is duly organized and is validly existing as a
corporation in good standing under the laws of the State of Delaware, with full
corporate power and authority to own its assets and conduct its business as it
is conducted, and is duly qualified as a foreign corporation in good standing in
all jurisdictions in which the ownership or lease of its property or the conduct
of its business requires such qualification (except where the failure to qualify
would not have a materially adverse effect on the consummation of any
transactions contemplated by this Agreement).

               (b) The execution and delivery by Depositor of this Agreement and
the performance of Depositor's obligations hereunder are within the corporate
power of Depositor and have been duly authorized by Depositor and neither the
execution and delivery by Depositor of this Agreement nor the compliance by
Depositor with the provisions hereof, nor the consummation by Depositor of the
transactions contemplated by this Agreement, will (i) conflict with or result in
a breach of, or constitute a default under, the certificate of incorporation or
by-laws of Depositor or, after giving effect to the consents or taking of the
actions contemplated by clause (ii) of this paragraph (b), any of the provisions
of any law, governmental rule, regulation, judgment, decree or order binding on
Depositor or its properties, or any of the provisions of any material indenture
or mortgage or any other material contract or other instrument to which
Depositor is a party or by which it is bound or result in the creation or
imposition of any lien, charge or encumbrance upon any of its properties
pursuant to the terms of any such indenture, mortgage, contract or other
instrument or (ii) require any consent of, notice to, or filing with any person,
entity or governmental body, which has not been obtained or made by Depositor,
except where, in any of the instances contemplated by clause (i) above or this
clause (ii), the failure to do so will not have a material and adverse effect on
the consummation of any transactions contemplated by this Agreement.

              (c) This Agreement has been duly executed and delivered by
Depositor and this Agreement constitutes a legal, valid and binding instrument,
enforceable against Depositor in accordance with its terms, subject, as to the
enforcement of remedies, to applicable bankruptcy, reorganization, insolvency,
moratorium and other laws affecting the rights of creditors generally and to
general principles of equity and the discretion of the court (regardless of
whether enforcement of such remedies is considered in a proceeding in equity or
at law) and, as to rights of indemnification hereunder, subject to limitations
of public policy under applicable securities laws.

              (d) There is no litigation, charge, investigation, action, suit or
proceeding by or before any court, regulatory authority or governmental agency
or body pending or, to the knowledge of Depositor, threatened against Depositor
the outcome of which could be reasonably expected to materially and adversely
affect the consummation of any transactions contemplated by this Agreement.

              Section 11. Survival of Certain Representations, Warranties and
Covenants. The respective representations and warranties set forth in or made
pursuant to this Agreement, and the respective obligations of the parties hereto
under Sections 7 and 13 of this Agreement, will remain in full force and effect,
regardless of any investigation or statement as to the result thereof made by or
on behalf of any party and will survive payment for the various transfers
referred to herein and delivery of the Certificates or termination of this
Agreement.

              Section 12. Transaction Expenses. In connection with the Closing
(and unless otherwise expressly provided herein, including, without limitation,
in Section 13 of this Agreement), Seller shall be responsible for the fees and
expenses of its own counsel, and Depositor and Seller agree to pay the other
transaction expenses incurred in connection with the transactions herein
contemplated as set forth in the Closing Statement (or, if not covered thereby,
shall be paid by the party incurring the subject expense).

              Section 13. Recording Costs and Expenses. Seller agrees to
reimburse the Trustee or its designee all recording and filing fees and expenses
incurred by the Trustee or its designee in connection with the recording or
filing of the Mortgage Loan Documents listed in Section 3 of this Agreement,
including Assignments. In the event Seller elects to engage a third-party
contractor to prepare, complete, file and record Assignments with respect to
Mortgage Loans as provided in Section 3 of this Agreement, Seller shall contract
directly with such contractor and shall be responsible for such contractor's
compensation and reimbursement of recording and filing fees and other
reimbursable expenses pursuant to their agreement.

              Section 14. Notices. All demands, notices and communications
hereunder shall be in writing and effective only upon receipt, and, (a) if sent
to Depositor, will be mailed, delivered or telecopied and confirmed to it at
Credit Suisse First Boston Mortgage Securities Corp., 11 Madison Avenue, 5th
Floor, New York, New York 10010, Attention: Edmund Taylor, Telecopy No.: (212)
743-4756 (with a copy to Casey McCutcheon, Esq., Legal & Compliance Department,
Telecopy No.: (917) 326-8433), or such other address or telecopy number as may
be designated by Depositor to Seller in writing, or (b) if sent to Seller, will
be mailed, delivered or telecopied and confirmed to it at 3414 Peachtree Road,
N.E., Suite 1140, Atlanta, Georgia 30326, Attention: Robert Barnes, Telecopy
No.: (404) 239-0419, or such other address or telecopy number as may be
designated by Seller to Depositor in writing.

              Section 15. Notice of Exchange Act Reportable Events. The Seller
hereby agrees to deliver to the Depositor and the Trustee any disclosure
information relating to any event reasonably determined in good faith by the
Depositor as required to be reported on Form 8-K, Form 10-D or Form 10-K by the
Trust Fund (in formatting reasonably appropriate for inclusion in such form),
including, without limitation, the disclosure required under Items 1117 and 1119
of Regulation AB and Item 1.03 to Form 8-K. The Seller shall use its best
efforts to deliver proposed disclosure language relating to any event described
under Items 1117 and 1119 of Regulation AB and Item 1.03 to Form 8-K to the
Trustee and the Depositor within one (1) business day and in any event no later
than two (2) business days of the Seller becoming aware of such event and shall
provide disclosure relating to any other event reasonably determined by the
Depositor as required to be disclosed on Form 8-K, Form 10-D or Form 10-K within
two (2) business days following the Depositor's request for such disclosure
language. The obligation of the Seller to provide the above referenced
disclosure materials will terminate upon notice from the Depositor or the
Trustee that the Trustee has filed a Form 15 with respect to the Trust Fund as
to that fiscal year in accordance with Section 11.10(a) of the Pooling and
Servicing Agreement. The Seller hereby acknowledges that the information to be
provided by it pursuant to this Section will be used in the preparation of
reports meeting the reporting requirements of the Trust under Section 13(a)
and/or Section 15(d) of the Securities Exchange Act of 1934, as amended.

              Section 16. Examination of Mortgage Files. Upon reasonable notice,
Seller, prior to the Closing Date, will make the Mortgage Files available to
Depositor or its agent for examination during normal business hours at Seller's
offices or such other location as shall otherwise be agreed upon by Depositor
and Seller. The fact that Depositor or its agent has conducted or has failed to
conduct any partial or complete examination of the Mortgage Files shall not
affect the rights of Depositor or the Trustee (for the benefit of the
Certificateholders) to demand cure, repurchase, or other relief as provided
herein.

              Section 17. Successors. This Agreement shall inure to the benefit
of and shall be binding upon Seller and Depositor and their respective
successors and, permitted assigns and nothing expressed in this Agreement is
intended or shall be construed to give any other Person any legal or equitable
right, remedy or claim under or in respect of this Agreement, or any provisions
herein contained, this Agreement and all conditions and provisions hereof being
intended to be and being for the sole and exclusive benefit of such designated
Persons and for the benefit of no other Person; it being understood that the
rights of Depositor pursuant to this Agreement, subject to all limitations
herein contained, including those set forth in Section 7 of this Agreement, may
be assigned to the Trustee, for benefit of the Certificateholders, as may be
required to effect the purposes of the Pooling and Servicing Agreement and, upon
such assignment, the Trustee shall succeed to such rights of Depositor
hereunder; provided that the Trustee shall have no right to further assign such
rights to any other Person. No owner of a Certificate issued pursuant to the
Pooling and Servicing Agreement shall be deemed a successor or permitted assign
because of such ownership.

              Section 18. Governing Law. THIS AGREEMENT SHALL BE GOVERNED AND
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO
AGREEMENTS TO BE MADE AND PERFORMED ENTIRELY WITHIN SUCH STATE WITHOUT GIVING
EFFECT TO CHOICE OF LAW PRINCIPLES.

               Section 19. Severability. If any provision of this Agreement shall
be prohibited or invalid under applicable law, this Agreement shall be
ineffective only to such extent, without invalidating the remainder of this
Agreement.

              Section 20. Further Assurances. Depositor and Seller agree to
execute and deliver such instruments and take such actions as the other party
may, from time to time, reasonably request in order to effectuate the purpose
and to carry out the terms of this Agreement.

               Section 21. Counterparts. This Agreement may be executed in
counterparts (and by each of the parties hereto on different counterparts), each
of which when so executed and delivered will be an original, and all of which
together will be deemed to constitute but one and the same instrument.

              Section 22. Treatment as Security Agreement. It is the express
intent of the parties hereto that the conveyance of the Mortgage Loans by Seller
to Depositor as provided in this Agreement be, and be construed as, a sale of
the Mortgage Loans by Seller to Depositor. It is, further, not the intention of
the parties that such conveyance be deemed a pledge of the Mortgage Loans by
Seller to Depositor to secure a debt or other obligation of Seller. However, in
the event that, notwithstanding the intent of the parties, the Mortgage Loans
are held to be property of Seller or if for any reason this Agreement is held or
deemed to create a security interest in the Mortgage Loans:

              (a) this Agreement shall hereby create a security agreement within
the meaning of Articles 8 and 9 of the Uniform Commercial Code in effect in the
applicable state;

              (b) the conveyance provided for in this Agreement shall hereby
grant from Seller to Depositor a security interest in and to all of Seller's
right, title, and interest, whether now owned or hereafter acquired, in and to:

                  (i) all accounts, contract rights (including any guarantees),
       general intangibles, chattel paper, instruments, documents, money,
       deposit accounts, certificates of deposit, goods, letters of credit,
       advices of credit and investment property consisting of, arising from or
       relating to any of the property described in the Mortgage Loans,
        including the related Notes, Mortgages and title, hazard and other
       insurance policies, identified on the Mortgage Loan Schedule or that
       constitute Replacement Mortgage Loans, and all distributions with respect
       thereto payable after the Cut-off Date;

                  (ii) all accounts, contract rights, general intangibles,
       chattel paper, instruments, documents, money, deposit accounts,
       certificates of deposit, goods, letters of credit, advices of credit and
       investment property arising from or by virtue of the disposition of, or
       collections with respect to, or insurance proceeds payable with respect
       to, or claims against other persons with respect to, all or any part of
       the collateral described in clause (i) above (including any accrued
       discount realized on liquidation of any investment purchased at a
       discount), in each case, payable after the Cut-off Date; and

                  (iii) all cash and non-cash proceeds of the collateral
       described in clauses (i) and (ii) above payable after the Cut-off Date;

              (c) the possession by Depositor or its assignee of the Notes and
such other goods, letters of credit, advices of credit, instruments, money,
documents, chattel paper or certificated securities shall be deemed to be
possession by the secured party or possession by a purchaser or a person
designated by him or her, for purposes of perfecting the security interest
pursuant to the Uniform Commercial Code (including, without limitation, Sections
9-306, 9-313 and 9-314 thereof) as in force in the relevant jurisdiction;

              (d) notifications to persons holding such property, and
acknowledgments, receipts, confirmations from persons holding such property,
shall be deemed to be notifications to, or acknowledgments, receipts or
confirmations from, securities intermediaries, bailees or agents of, or persons
holding for (as applicable), Depositor or its assignee for the purpose of
perfecting such security interest under applicable law; and

              (e) Seller at the direction of Depositor or its assignee, shall,
to the extent consistent with this Agreement, take such actions as may be
necessary to ensure that, if this Agreement were deemed to create a security
interest in the Mortgage Loans and the proceeds thereof, such security interest
would be a perfected security interest of first priority under applicable law
and will be maintained as such throughout the term of this Agreement. In
connection herewith, Depositor and its assignee shall have all of the rights and
remedies of a secured party and creditor under the Uniform Commercial Code as in
force in the relevant jurisdiction and may prepare and file such UCC Financing
Statements as may be necessary or appropriate to accomplish the foregoing.


                                         * * *



<PAGE>


              IN WITNESS WHEREOF, the parties hereto have caused this Mortgage
Loan Purchase Agreement to be duly executed and delivered as the date first
above written.



                                            COLUMN FINANCIAL, INC.,
                                            as Seller



                                            By: ________________________________
                                                 Name:
                                                Title:



                                            CREDIT SUISSE FIRST BOSTON MORTGAGE
                                            SECURITIES CORP.,
                                             as Depositor




                                            By: ________________________________
                                                Name:
                                                Title:



<PAGE>
                                                                       SCHEDULE I


                          SCHEDULE OF TRANSACTION TERMS

              This Schedule of Transaction Terms is appended to and incorporated
by reference in the Mortgage Loan Purchase Agreement (the "Agreement"), dated as
of September 1, 2006, between Column Financial, Inc. (the "Seller") and Credit
Suisse First Boston Mortgage Securities Corp (the "Depositor"). Capitalized
terms used herein without definition have the meanings given them in or by
reference in the Agreement or, if not defined in the Agreement, in the Pooling
and Servicing Agreement.

              "Affiliate" means with respect to any specified Person, any other
Person controlling or controlled by or under common control with such specified
Person.

              "Assignments" shall have the meaning given such term in Section 3
of this Agreement.

              "Borrower" means the borrower under a Mortgage Loan.

              "Breach" shall have the meaning given such term in Section 7 of
this Agreement.

              "CBA Mortgage Loan" means any Mortgage Loan that constitutes a
"CBA A Loan" under the Pooling and Servicing Agreement.

              "Certificate Purchase Agreement" means the Certificate Purchase
Agreement, dated September 21, 2006, between Depositor and the Initial
Purchaser.

              "Certificates" means the Credit Suisse First Boston Mortgage
Securities Corp., Commercial Mortgage Pass-Through Certificates, Series 2006-C4,
issued in multiple classes.

              "Closing" shall have the meaning given that term in Section 2 of
this Agreement.

              "Closing Date" means September 28, 2006.

              "Closing S


 
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