Document:

EXHIBIT 10.3

              CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
                                   (Depositor)

                                       and

                          KEYBANK NATIONAL ASSOCIATION
                                    (Seller)

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

                        MORTGAGE LOAN PURCHASE AGREEMENT

                          Dated as of September 1, 2006

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

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                                TABLE OF CONTENTS

                                                                            Page

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
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

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                        MORTGAGE LOAN PURCHASE AGREEMENT

            This Mortgage Loan Purchase Agreement (this "Agreement"), dated as
of September 1, 2006, is made by and between KEYBANK NATIONAL ASSOCIATION, a
national banking association ("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.

            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 national
      banking association in good standing under the laws of the United States
      of America. 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 KeyBank National Association 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 KeyBank National
      Association 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 KeyBank National Association Indemnification
      Agreement) or, to the extent consistent therewith, the Diskette (as
      defined in the KeyBank National Association 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" and "Description of the Underlying 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 KeyBank National
Association c/o KeyBank Real Estate Capital, 911 Main Street, Suite 1500, Kansas
City, Missouri, 64105 Attention: Clay M. Sublett, Telecopy No.: (816) 221-8848
(with a copy to, 127 Public Square, Cleveland, Ohio 44114 Attention: Robert C.
Bowes, Telecopy No.:(216) 689-5681)), 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.

                                    KEYBANK NATIONAL ASSOCIATION,
                                    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 KeyBank National Association (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.

            "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 Statement" means the closing statement dated as of the
Closing Date and signed by, among others, the parties to this Agreement.

            "Code" means the Internal Revenue Code of 1986, as amended.

            "Crossed Mortgage Loan" means any Mortgage Loan which is
cross-defaulted and cross-collateralized with any other Mortgage Loan.

            "Cut-off Date" means, individually and collectively, the applicable
Due Dates for the respective Mortgage Loans occurring in September 2006 (or with
respect to Mortgage Loans which had closing/funding dates in September 2006, the
respective closing/funding dates of such Mortgage Loans).

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

            "Environmental Report" means the environmental audit report with
respect to each Mortgaged Property delivered to Seller in connection with the
related Mortgage, if any.

            "Exception Report" means the exceptions with respect to the
representations and warranties made by Seller as to the Mortgage Loans in
Section 6(a)(xii) and under the written certificate described in Section
4(b)(iii) of this Agreement, which exceptions are set forth in Schedule V
attached hereto and made a part hereof.

            "Initial Purchaser" means Credit Suisse Securities (USA) LLC.

            "Initial Resolution Period" shall have the meaning given such term
in Section 7 of this Agreement.

            "KeyBank National Association Indemnification Agreement" means the
agreement by and among the Depositor, the Seller and each Underwriter.

            "Loan Agreement" means, with respect to any Mortgage Loan, the loan
agreement, if any, between the related Mortgage Loan Originator and the related
Borrower, pursuant to which such Mortgage Loan was made.

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

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

            "Mortgage File" means, collectively, the documents and instruments
pertaining to a Mortgage Loan required to be included in the related Mortgage
File pursuant to Section 3 of this Agreement (subject to the first proviso in
Section 1 of this Agreement).

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

            "Mortgage Loan" and "Mortgage Loans" shall have the respective
meanings given such terms in Recital II of this Agreement.

            "Mortgage Loan Documents" means, collectively, the documents and
instruments pertaining to a Mortgage Loan to be included in either the related
Mortgage File or the related Servicer File.

            "Mortgage Loan Originator" means any institution which originated a
Mortgage Loan for a related Borrower.

            "Mortgage Loan Purchase Price" means the amount described in Section
2 of this Agreement.

            "Mortgage Loan Schedule" shall have the meaning given such term in
Recital II of this Agreement.

            "Offering Circular" means the confidential offering circular dated
September 21, 2006, describing certain classes of the Private Certificates.

            "Pooling and Servicing Agreement" means the Pooling and Servicing
Agreement creating the Trust Fund and the interests therein, dated as of
September 1, 2006, among Depositor, the Master Servicers, the Special Servicers
and the Trustee, including, without limitation, the exhibits and schedules
annexed thereto.

            "Primary Collateral" means with respect to any Crossed Mortgage
Loan, that portion of the Mortgaged Property designated as directly securing
such Crossed Mortgage Loan and excluding any Mortgaged Property as to which the
related lien may only be foreclosed upon by exercise of the
cross-collateralization provisions of such Crossed Mortgage Loan.

            "Private Certificates" means the Certificates that are not Publicly
Offered Certificates.

            "Prospectus" means the Prospectus dated September 8, 2006, that is a
part of Depositor's registration statement on Form S-3 (File No. 333-129918).

            "Prospectus Supplement" means the Prospectus Supplement, dated
September 21, 2006, relating to the Publicly Offered Certificates.

            "Publicly Offered Certificates" means the Class A-1, Class A-2,
Class A-AB, Class A-3, Class A-1-A, Class A-M and Class A-J Certificates.

            "Servicer File" means, collectively, all documents, records and
copies pertaining to a Mortgage Loan which are required to be included in the
related Servicer File pursuant to Section 3.

            "Trust Fund" shall have the meaning given such term in Recital II of
this Agreement.

            "Trustee" shall have the meaning given such term in Section 1 of
this Agreement.

            "Underwriters" means Credit Suisse Securities (USA) LLC, LaSalle
Financial Services, Inc., KeyBanc Capital Markets, Barclays Capital Inc.,
Wachovia Capital Markets, LLC and Greenwich Capital Markets, Inc.

            "Underwriting Agreement" means the Underwriting Agreement, dated
September 21, 2006, between Depositor and the Underwriters.

<PAGE>

                                                                     SCHEDULE II

                             MORTGAGE LOAN SCHEDULE

                                  See Attached.

<PAGE>

                                                                    SCHEDULE III

                   MORTGAGE LOANS CONSTITUTING MORTGAGE GROUPS

     Loan Name                           Cutoff Balance   Loan Seller
--   ---------------------------------   --------------   -----------
1.   Springdale Center(1)                   $36,907,000     KeyBank
2.   Chicopee Marketplace Shopping
     Center(1)                              $17,415,000     KeyBank
3.   Wilkes-Barre Towne Marketplace(1)      $10,613,000     KeyBank
4.   Cobblestone Village(1)                  $9,994,000     KeyBank
5.   Fashion Square Shopping Center(1)       $7,517,000     KeyBank
6.   Three City Center(2)                   $18,800,000     KeyBank
7.   Lazy Boy Distribution Center(2)        $14,100,000     KeyBank
8.   Jacobson Warehouse(2)                   $6,900,000     KeyBank

----------
(1) Loan crossed with other loans marked with footnote (1).
(2) Loan crossed with other loans marked with footnote (2).

<PAGE>

                                                                     SCHEDULE IV

                         MORTGAGE LOANS WITH LOST NOTES

                                      None

<PAGE>

                                                                      SCHEDULE V

                             EXCEPTIONS TO SELLER'S
                         REPRESENTATIONS AND WARRANTIES

            Reference is made to the Representations and Warranties set forth in
Exhibit A attached hereto corresponding to the paragraph numbers set forth
below:

Exception to Representation (xx):

      A third party is entitled to a correspondent fee with respect to each of
the following Mortgage Loans:

      010029856/Fox & Hounds Apartments

      010030032/Post Road

      010030084/Stanley Square

      010030976/Shepard Building

      010031044/The Art Institute

      010031092/StorQuest Self Storage

      010031296/Sully Tech

      10030915/Ward Parkway

      10030978/Burlington and East 19th Buildings

Exception to Representation (xxiii):

      With respect to Loan No. 10031085/Springdale Mall, the Mortgage Loan
Documents require the insurance carrier's rating issued by S&P to be no less
than "A".

      With respect to Loan No. 10030150/Colonial Heights Apartments, the
Mortgage Loan Documents require a rating of the insurer from Best's Key Rating
Guide of no less than B+:V.

      With respect to Loan Nos. 10031141/Chicopee Marketplace,
10031142/Wilkes-Barre Township Marketplace, 10031143/Cobblestone Village,
10031144/Fashion Square and 10031085/Springdale Center, the borrower under the
related Mortgage Loan is not required to maintain terrorism coverage if the
premium exceeds $50,000 annually.

      With respect to Loan Nos. 10030602/Three City Centre/Frontier, 10030603/La
Z Boy Distribution Center, and 10030604/Jacobson Warehouse, the borrower under
the related Mortgage Loan is not required to maintain terrorism coverage unless
(I) prudent owners of real estate comparable to the Mortgaged Property are
maintaining same, (II) prudent institutional lenders are requiring that such
owners maintain such insurance, and (III) if such insurance is obtainable from
any insurer or the United States of America or any agency or instrumentality
thereof and the lack of such insurance in and of itself will result in a
qualification, downgrade or withdrawal of the then current rating assigned, or
to be assigned, or prevent ratings from being assigned, to the securities or any
class thereof in any applicable securitization.

      With respect to Loan Nos. 10030602/Three City Centre/Frontier, 10030603/La
Z Boy Distribution Center, and 10030604/Jacobsen Warehouse, the Mortgage Loan
Documents require a rating of the insurer from Best's Key Rating Guide of no
less than A-:V.

      With respect to Loan No. 10030769/Ludlam Point Apartments, the Mortgage
Loan Documents allow the insurance to include an 80% co-insurance provision.

      With respect to Loan No. 10030633/Four Gateway, the Mortgage Loan
Documents require the insurance carrier's rating issued by S&P to be no less
than "A".

      With respect to Loan No. 10030663/Hobbs Brook, the borrower under the
related Mortgage Loan is required to maintain terrorism coverage only if (a) it
is commercially available and (b) it can be obtained at a commercially
reasonable cost.

Exception to Representation (xxvii):

      With respect to Loan No. 10030084/Stanley Square Shopping Center, a Phase
I environmental site assessment conducted on the related Mortgaged Property
indicated that a subsurface investigation conducted at the Mortgaged Property in
March 2006 identified one soil sample with concentrations of trichloroethene
above Kansas Department of Health and Environment ("KDHE") cleanup standards.
Groundwater samples collected were either not detected for volatile organic
compounds or were below the KDHE cleanup standards. The related borrower
submitted an application on April 6, 2006 to the KDHE Dry-Cleaning Facility
Release Trust Fund.

      With respect to Loan No. 10031085/Springdale Mall, a Phase I environmental
site assessment conducted on the related Mortgaged Property recommended that a
subsurface investigation be conducted at the Mortgaged Property to determine any
impacts from an historical dry-cleaning facility that operated at the Mortgaged
Property from approximately 1960 to 1976.

      With respect to Loan No. 10030215/Amity Plaza, Lender obtained an
environmental insurance policy issued by Indian Harbor Insurance Company with a
coverage amount of $2,000,000 and a policy term of ten (10) years with a two
year extended reporting period.

Exception to Representation (xxviii):

      With respect to Loan No. 10029856/Fox & Hound Apartments, tenant in common
interests in the related Mortgaged Property may be transferred to up to 8
tenants in common upon satisfaction of specified conditions, including, among
others, no change in control of the borrower under the related Mortgage Loan and
the sponsor's maintenance of no less than a 10% interest in the borrower.

      With respect to Loan No. 10030976/Shepard Building, up to 50% of the
membership interests in the borrower under the related Mortgage Loan may be
transferred to a specified entity upon satisfaction of specified conditions,
including, among others, no change in control of the borrower.

      With respect to Loan No. 10030678/8401 New Trails Drive Office Building,
tenant in common interests in the related Mortgaged Property may be transferred
to up to 35 tenants in common upon satisfaction of specified conditions.

      With respect to Loan No. 10031296/Sully Tech Building, membership
interests in the borrower under the related Mortgage Loan may be transferred
upon satisfaction of specified conditions, including, among others, that the
control of the borrower and management of the Mortgaged Property shall remain
with one or more specified individuals.

      With respect to Loan No. 10030663/Hobbs Brook, direct and indirect
membership interests in the borrower under the related Mortgage Loan may be
transferred to certain entities which satisfy specified criteria, upon the
satisfaction of specified conditions.

      With respect to Loan Nos. 10031141/Chicopee Marketplace,
10031142/Wilkes-Barre Township Marketplace, 10031143/Cobblestone Village,
10031144/Fashion Square and 10031085/Springdale Center indirect ownership
interests in the borrower under the related Mortgage Loan may be transferred,
upon the satisfaction of specified conditions.

Exception to Representation (xxxi):

      (D) With respect to Loan No. 10031142/Wilkes-Barre Towne Marketplace, the
ground lessor's fee interest is subject to a mortgage, which is superior to the
ground lease. The lender under the related Mortgage Loan obtained a
non-disturbance agreement with regard to the ground lease from the fee
mortgagee.

Exception to Representation (xxxviii):

      With respect to Loan No. 10031373/Beck Business Center, future subordinate
debt secured by a mortgage is permitted provided certain conditions are
satisfied, including, among others, prior consent of the mortgagee and
satisfaction of specified debt service coverage and loan to value ratios.

      With respect to Loan No. 10031008/Brainard Place Medical Campus, future
mezzanine debt is permitted provided certain conditions are satisfied,
including, among others, prior consent of the mortgagee and satisfaction of
specified debt service coverage and loan to value ratios.

Exception to Representation (xl):

      With respect to Loan No. 10029856/Fox & Hound Apartments, all required
action has been taken to cause the Mortgaged Property to be a separate tax lot,
however, the governmental authority has not issued a separate tax lot number.

Exception to Representation (xlvii):

      With respect to Loan Nos. 10031094/Stor-More Self Storage and
10031144/Fashion Square, the Mortgage Loan requires the lender to release a
specifically identified portion of the Mortgaged Property upon the satisfaction
of certain conditions, including, among others, a debt-service-coverage ratio
test.

Exception to Representation (li):

      With respect to Loan No. 10030769/Ludlam Point Apartments, the related
Mortgaged Property is legal non-conforming in that the Mortgaged Property
contains more multi-family residential units than would be permitted by current
zoning laws based on the size of the Mortgaged Property. Law and ordinance
coverage was not obtained.

      With respect to Loan No. 10030215/Amity Plaza Shopping Center, the related
Mortgaged Property is legal non-conforming in that current zoning laws would
require a greater number of parking spaces than are currently provided on the
Mortgaged Property based on the size, improvements and use of the Mortgaged
Property. Law and ordinance coverage was not obtained.

Exception to Representation (liii):

      With respect to Loan Nos. 10029164/1980 Gallows Road Office,
10031155/Linkletter Self Storage, 10031172/Lyndie Office Center, the borrower
under the related Mortgage Loan may pledge REMIC eligible collateral other than
United States government securities.

Exception to Representation (liv):

      With respect to Loan Nos. 10030807/Baldwin Commons, 10030654/Northville
Retail Center, and 10030663/Hobbs Brook, the Mortgage Loan Documents provide
that the respective borrower thereunder is liable to the lender for any losses
incurred by the lender due to the misapplication or misappropriation of rents
only following the occurrence of an event of default.

Exception to Representation (lv):

      With respect to Loan Nos. 10031044/The Art Institute, 10030678/8401 New
Trails Drive Office Building, 10030807/Baldwin Commons, and 10030654/Northville
Retail Center, the Mortgage Loan Documents provide for an initial interest only
period before amortization commences.

<PAGE>

                                                                       EXHIBIT A

                    REPRESENTATIONS AND WARRANTIES OF SELLER
                          REGARDING THE MORTGAGE LOANS

            For purposes of these representations and warranties, the phrase "to
the knowledge of Seller" or "to Seller's knowledge" shall mean, except where
otherwise expressly set forth below, the actual state of knowledge of Seller or
any servicer acting on its behalf regarding the matters referred to, in each
case without having conducted any independent inquiry or due diligence with
respect to such matters and without any actual or implied obligation to make
such inquiry or perform such due diligence, other than making such inquiry or
performing such due diligence as would be customarily performed by prudent
commercial or multifamily mortgage lenders or servicers (as the case may be)
with respect to similar mortgage loans or mortgaged properties. All information
contained in documents which are part of or required to be part of a Mortgage
File shall be deemed to be within the knowledge of Seller. Wherever there is a
reference to receipt by, or possession of, Seller of any information or
documents, or to any action taken by Seller or not taken by Seller, such
reference shall include the receipt or possession of such information or
documents by, or the taking of such action or the not taking of such action by,
either Seller or any servicer acting on its behalf.

            Seller hereby represents and warrants, subject to the
exceptions set forth in the Exception Report annexed to this Agreement as
Schedule V, with respect to the Mortgage Loans that as of the date hereinbelow
specified or, if no such date is specified, as of the date of this Agreement:

            (i) Immediately prior to the sale, transfer and assignment to
Depositor, no Note or Mortgage was subject to any assignment (other than
assignments which show a complete chain of assignment to Seller), participation
or pledge, and Seller had good and marketable title to, and was the sole owner
of, the related Mortgage Loan;

            (ii) Each Mortgage Loan was either:

            (A)   originated by a savings and loan association, savings bank,
                  commercial bank, credit union, or insurance company, which is
                  supervised and examined by a Federal or State authority, or by
                  a mortgagee approved by the Secretary of Housing and Urban
                  Development pursuant to Sections 203 and 211 of the National
                  Housing Act (any of the foregoing, including Seller, a
                  "Qualified Originator"); or

            (B)   if originated by a person which is not a Qualified Originator
                  (any such person, a "Non-Qualified Originator"), then:

                  1.    such Mortgage Loan was underwritten in accordance with
                        standards established by a Qualified Originator, using
                        application forms and related credit documents approved
                        by the Qualified Originator;

                  2.    the Qualified Originator approved each application and
                        related credit documents before a commitment by the
                        Non-Qualified Originator was issued, and no such
                        commitment was issued until the Qualified Originator
                        agreed to fund such Mortgage Loan;

                  3.    the Mortgage Loan was originated by the Non-Qualified
                        Originator pursuant to an ongoing, standing relationship
                        with the Qualified Originator; and

                  4.    the closing documents for the Mortgage Loan were
                        prepared on forms approved by the Qualified Originator,
                        and, pursuant to the Non-Qualified Originator's ongoing,
                        standing relationship with the Qualified Originator,
                        either:

                        (x)   such closing documents reflect the Qualified
                              Originator as the original mortgagee, and such
                              Mortgage Loan was actually funded by the Qualified
                              Originator at the closing thereof;

                        (y)   such closing documents reflect the Non-Qualified
                              Originator as the original mortgagee, but include
                              assignment documents executed by the Non-Qualified
                              Originator in favor of the Qualified Originator at
                              the time of the closing of the Mortgage Loan,
                              reflecting the Qualified Originator as the
                              successor and assign to the Non-Qualified
                              Originator, and the Mortgage Loan was funded
                              initially by the Non-Qualified Originator at the
                              closing thereof and then acquired by the Qualified
                              Originator from such Non-Qualified Originator; or

                        (z)   such closing documents reflect the Non-Qualified
                              Originator as the original mortgagee, but include
                              assignment documents executed by the Non-Qualified
                              Originator in favor of the Qualified Originator at
                              the time of the closing of the Mortgage Loan,
                              reflecting the Qualified Originator as the
                              successor and assign to the Non-Qualified
                              Originator, and the Mortgage Loan was funded
                              initially by the Qualified Originator at the
                              closing thereof and then acquired by the Qualified
                              Originator from such Non-Qualified Originator.

            (iii) Seller has full right and authority to sell, assign and
transfer such Mortgage Loan and the assignment to Depositor constitutes a legal,
valid and binding assignment of such Mortgage Loan;

            (iv) Seller is transferring such Mortgage Loan free and clear of any
and all liens, pledges, charges or any other interests or security interests of
any nature encumbering such Mortgage Loan, except for interests in servicing
rights created or granted under the Pooling and Servicing Agreement,
subservicing agreements and/or servicing rights purchase agreements being
executed and delivered in connection herewith;

            (v) To Seller's knowledge, based on the related borrower's
representations and covenants in the related mortgage loan documents and such
other due diligence as a reasonably prudent commercial mortgage lender would
deem appropriate, the borrower, lessee and/or operator was in possession of all
licenses, permits, and authorizations then required for use of the Mortgaged
Property which were valid and in full force and effect as of the origination
date and, to Seller's actual knowledge, such licenses, permits and
authorizations are still valid and in full force and effect;

            (vi) Each related Note, Mortgage, Assignment of Leases (if any) and
other agreement executed by or for the benefit of the related borrower, any
guarantor or their successors or assigns in connection with such Mortgage Loan
is the legal, valid and binding obligation of the related borrower, enforceable
in accordance with its terms, except as such enforcement may be limited by
bankruptcy, insolvency, reorganization, moratorium or other laws affecting the
enforcement of creditors' rights or by general principles of equity (regardless
of whether such enforceability is considered in a proceeding in equity or at
law); and there is no right of offset, rescission, abatement or diminution or
valid defense or counterclaim available to the related borrower with respect to
such Note, Mortgage, Assignment of Leases and other agreements, except as the
enforcement thereof may be limited by bankruptcy, insolvency, reorganization,
moratorium or other laws affecting the enforcement of creditors' rights or by
general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law);

            (vii) The Mortgage File contains an Assignment of Leases, either as
a separate instrument or incorporated into the related Mortgage. Each related
Assignment of Leases creates a valid first priority collateral assignment of, or
a valid first priority lien or security interest in, certain rights under the
related lease or leases, subject only to a license granted to the related
borrower to exercise certain rights and to perform certain obligations of the
lessor under such lease or leases, including the right to operate the related
leased property, except as the enforcement thereof may be limited by bankruptcy,
insolvency, reorganization, moratorium or other laws affecting the enforcement
of creditors' rights or by general principles of equity (regardless of whether
such enforceability is considered in a proceeding in equity or at law); no
person other than the related borrower owns any interest in any payments due
under such lease or leases that is superior to or of equal priority with the
lender's interest therein;

            (viii) Each related assignment of Mortgage from Seller to the
Trustee and related assignment of the Assignment of Leases, if the Assignment of
Leases is a separate document from the Mortgage, is in recordable form (but for
the insertion of the name and address of the assignee and any related recording
information, which is not yet available to Seller), and such assignments and any
assignment of any other agreement executed by or for the benefit of the related
borrower, any guarantor or their successors or assigns in connection with such
Mortgage Loan from Seller to the Trustee constitutes the legal, valid and
binding assignment from Seller to the Trustee, except as the enforcement thereof
may be limited by bankruptcy, insolvency, reorganization, liquidation,
receivership, moratorium or other laws relating to or affecting the enforcement
of creditors' rights or by general principles of equity (regardless of whether
such enforceability is considered in a proceeding in equity or at law);

            (ix) Since origination (A) except as set forth in the related
Mortgage File, such Mortgage Loan has not been modified, altered, satisfied,
canceled, subordinated or rescinded in whole or in part and (B) each related
Mortgaged Property has not been released, in whole or in part, from the lien of
the related Mortgage in any manner which materially interferes with the security
intended to be provided by such Mortgage; and since September 21, 2006, no
waiver, consent, modification, assumption, alteration, satisfaction,
cancellation, subordination or rescission which changes the terms of, or the
security for, the Mortgage Loan in any material respect has occurred or been
given;

            (x) Each related Mortgage is a valid and enforceable first lien on
the related Mortgaged Property (subject to Permitted Encumbrances (as defined
below)), except as the enforcement thereof may be limited by bankruptcy,
insolvency, reorganization, moratorium or other laws affecting the enforcement
of creditors' rights or by general principles of equity (regardless of whether
such enforceability is considered in a proceeding in equity or at law), and
except that, in the case of the CBA Mortgage Loans the related Mortgage
encumbering the related Mortgaged Property also secures one or more other
mortgage loans; and such Mortgaged Property is free and clear of any mechanics'
and materialmen's liens which are prior to or equal with the lien of the related
Mortgage, except those which are insured against by a lender's title insurance
policy (as described below). A UCC Financing Statement has been filed and/or
recorded (or sent for filing or recording) in all places necessary to perfect a
valid security interest in the personal property necessary to operate the
Mortgaged Property as currently operated; and such security interest is a first
priority security interest, subject to any prior purchase money security
interest in such personal property, any personal property leases applicable to
such personal property and any other security interest in such personal property
which do not, individually or in the aggregate, materially interfere with the
security intended to be provided for such Mortgage Loan. Any security agreement,
chattel mortgage or equivalent document related to and delivered in connection
with the Mortgage Loan establishes and creates a valid and enforceable lien on
the property described therein, except as such enforcement may be limited by
bankruptcy, insolvency, reorganization, moratorium or other laws affecting the
enforcement of creditors' rights or by general principles of equity (regardless
of whether such enforceability is considered in a proceeding in equity or at
law). In the case of any Mortgage Loan secured by a hotel, the related loan
documents contain such provisions as are necessary and UCC Financing Statements
have been filed as necessary, in each case, to perfect a valid first priority
security interest in the related operating revenues with respect to such
Mortgaged Property. Notwithstanding the foregoing, no representation is made as
to the perfection of any security interest in rent, operating revenues or other
personal property to the extent that possession or control of such items or
actions other than the filing of UCC Financing Statements are required in order
to effect such perfection;

            (xi) Seller has not taken any action that would cause the
representations and warranties made by the related borrower in the related
Mortgage Loan Documents not to be true;

            (xii) Seller has no knowledge that the material representations and
warranties made by the related borrower in the related Mortgage Loan Documents
are not true in any material respect;

            (xiii) The lien of each related Mortgage is a first priority lien on
the fee or leasehold interest of the related borrower in the principal amount of
such Mortgage Loan or allocated loan amount of the portions of the Mortgaged
Property covered thereby (as set forth in the related Mortgage) after all
advances of principal and is insured by an ALTA lender's title insurance policy
(except that if such policy is yet to be issued, such insurance may be evidenced
by a "marked up" pro forma policy or title commitment in either case marked as
binding and countersigned by the title company or its authorized agent, either
on its face or by an acknowledged closing instruction or escrow letter), or its
equivalent as adopted in the applicable jurisdiction, insuring the named
mortgagee and its successors and assigns (as sole insured) as to such lien,
subject only to (A) the lien of current real property taxes, water charges,
sewer rents and assessments not yet delinquent or accruing interest or
penalties, (B) covenants, conditions and restrictions, rights of way, easements
and other matters of public record, none of which, individually or in the
aggregate, materially interferes with the current use of the Mortgaged Property
or the security intended to be provided by such Mortgage or with the borrower's
ability to pay its obligations when they become due or the value of the
Mortgaged Property, (C) the exceptions (general and specific) and exclusions set
forth in such policy, none of which, individually or in the aggregate,
materially interferes with the current general use of the Mortgaged Property or
materially interferes with the security intended to be provided by such Mortgage
or with the related borrower's ability to pay its obligations when they become
due or the value of the Mortgaged Property, (D) the rights of tenants, as
tenants only, under leases, including subleases, pertaining to the related
Mortgaged Property, (E) if the related Mortgage Loan is cross-collateralized
with any other Mortgage Loan, the lien of the mortgage instrument for that other
Mortgage Loan and (F) if the related Mortgaged Property is a unit in a
condominium, the related condominium declaration (items (A), (B), (C), (D), (E)
and (F) collectively, "Permitted Encumbrances"), and except that, in the case of
the CBA Mortgage Loans, the related Mortgage encumbering the related Mortgaged
Property also secures one or more other mortgage loans; and with respect to each
Mortgage Loan, such Permitted Encumbrances do not, individually or in the
aggregate, materially interfere with the security intended to be provided by the
related Mortgage, the current principal use of the related Mortgaged Property or
the current ability of the related Mortgaged Property to generate income
sufficient to service such Mortgage Loan; the premium for such policy was paid
in full; such policy (or if it is yet to be issued, the coverage to be afforded
thereby) is issued by a title insurance company licensed to issue policies in
the state in which the related Mortgaged Property is located (unless such state
is Iowa) and is assignable (with the related Mortgage Loan) to Depositor and the
Trustee without the consent of or any notification to the insurer, and is in
full force and effect upon the consummation of the transactions contemplated by
this Agreement; no claims have been made under such policy and Seller has not
undertaken any action or omitted to take any action, and has no knowledge of any
such act or omission, which would impair or diminish the coverage of such
policy;

            (xiv) The proceeds of such Mortgage Loan have been fully disbursed
and there is no requirement for future advances thereunder, and no future
advances have been made which are not reflected in the related Mortgage File;

            (xv) Except as set forth in a property inspection report or
engineering report prepared in connection with the origination of the Mortgage
Loan, as of the later of the date of origination of such Mortgage Loan or the
most recent inspection of the related Mortgaged Property by Seller, as
applicable, and to the knowledge of Seller as of the date hereof, each related
Mortgaged Property is free of any material damage that would affect materially
and adversely the use or value of such Mortgaged Property as security for the
Mortgage Loan (normal wear and tear excepted). If any of the inspection or
engineering reports referred to above in this paragraph (xv) revealed any
immediate repair items, then one of the following is true: (A) the repairs
and/or maintenance necessary to correct such condition have been completed in
all material respects; (B) an escrow of funds is required or a letter of credit
was obtained in an amount reasonably estimated to be sufficient to complete the
repairs and/or maintenance necessary to correct such condition; or (C) the
reasonable estimation at the time of origination of the Mortgage Loan of the
cost to complete the repairs and/or maintenance necessary to correct such
condition represented no more than the greater of (1) $50,000 and (2) 2% of the
value of the related Mortgaged Property as reflected in an appraisal conducted
in connection with the origination of the subject Mortgage Loan; as of the
closing date for each Mortgage Loan and, to Seller's knowledge, as of the date
hereof, there is no proceeding pending for the total or partial condemnation of
such Mortgaged Property that would have a material adverse effect on the use or
value of the Mortgaged Property;

            (xvi) Seller has inspected or caused to be inspected each related
Mortgaged Property within the past twelve months, or the originator of the
Mortgage Loan inspected or caused to be inspected each related Mortgaged
Property within three months of origination of the Mortgage Loan;

            (xvii) No Mortgage Loan has a shared appreciation feature, any other
contingent interest feature or a negative amortization feature other than the
ARD Loans which may have negative amortization from and after the related
Anticipated Repayment Date;

            (xviii) Each Mortgage Loan is a whole loan, and neither the Mortgage
Loan nor the related Mortgage Loan Documents create or grant an equity
participation to the lender or any other party;

            (xix) The Mortgage Rate (exclusive of any default interest, late
charges, or prepayment premiums) of such Mortgage Loan complied as of the date
of origination with, or was exempt from, applicable state or federal laws,
regulations and other requirements pertaining to usury. Except to the extent any
noncompliance did not materially and adversely affect the value of the related
Mortgaged Property, the security provided by the Mortgage or the related
borrower's operations at the related Mortgaged Property, any and all other
requirements of any federal, state or local laws, including, without limitation,
truth-in-lending, real estate settlement procedures, equal credit opportunity or
disclosure laws, applicable to such Mortgage Loan have been complied with as of
the date of origination of such Mortgage Loan;

            (xx) Neither Seller nor, to Seller's knowledge, any originator,
committed any fraudulent acts during the origination process of any Mortgage
Loan and (i) the origination of each Mortgage Loan is in all respects legal,
proper and prudent in accordance with customary commercial mortgage lending
standards and (ii) the servicing and collection of each Mortgage Loan is in all
respects legal, proper and prudent in accordance with servicing standard and no
other person has been granted or conveyed the right to service the Mortgage
Loans or receive any consideration in connection therewith, except as provided
in the Pooling and Servicing Agreement or any permitted subservicing agreements
and/or servicing rights purchase agreements being executed and delivered in
connection therewith;

            (xxi) All taxes and governmental assessments that became due and
owing prior to the date hereof with respect to each related Mortgaged Property
and that are or may become a lien of priority equal to or higher than the lien
of the related Mortgage have been paid or an escrow of funds has been
established and such escrow (including all escrow payments required to be made
prior to the delinquency of such taxes and assessments) is sufficient to cover
the payment of such taxes and assessments;

            (xxii) All escrow deposits and payments required pursuant to each
Mortgage Loan are in the possession, or under the control, of Seller or its
agent and there are no deficiencies (subject to any applicable grace or cure
periods) in connection therewith, all such escrows and deposits are being
conveyed by Seller to Depositor and identified as such with appropriate detail,
and any and all requirements for the disbursement of any such escrows have been
complied with in all material respects;

            (xxiii) Each related Mortgaged Property is insured by a fire and
extended perils insurance policy, issued by an insurer meeting the requirements
of the Pooling and Servicing Agreement, in an amount not less than the lesser of
the principal amount of the related Mortgage Loan and the replacement cost (with
no deduction for physical depreciation) and not less than the amount necessary
to avoid the operation of any co-insurance provisions with respect to the
related Mortgaged Property; each related Mortgaged Property is also covered by
business interruption or rental loss insurance which covers a period of not less
than 12 months and comprehensive general liability insurance in amounts
generally required by prudent commercial mortgage lenders for similar
properties; all Mortgaged Properties in California or in a seismic zone 4 or 5
have had a seismic assessment done and earthquake insurance was obtained to the
extent any such Mortgaged Property has a probable maximum loss in the event of
an earthquake of greater than twenty percent (20%) of the replacement value of
the related improvements; if the Mortgaged Property for any Mortgage Loan is
located within Florida or within 25 miles of the coast of North Carolina, South
Carolina, Georgia, Alabama, Mississippi, Louisiana or Texas, then, such
Mortgaged Property is insured by windstorm insurance in an amount at least equal
to the lesser of (i) the outstanding principal balance of such Mortgage Loan and
(ii) 100% of the insurable replacement cost of the improvements located on the
related Mortgaged Property; the Mortgaged Properties securing all of the
Mortgage Loans having a Cut-off Date Principal Balance in excess of $3,000,000
have, as of the date hereof, insurance policies in place with respect to acts of
terrorism or damage related thereto (excluding acts involving nuclear,
biological or chemical terrorism), except any such Mortgage Loans that are
listed on the applicable Exception Report. All premiums on such insurance
policies required to be paid as of the date hereof have been paid; such
insurance policies or the related insurance certificates require prior notice to
the insured of reduction in coverage, termination or cancellation, and no such
notice has been received by Seller; such insurance names the lender under the
Mortgage Loan and its successors and assigns as a named or additional insured;
each related Mortgage Loan obligates the related borrower to maintain all such
insurance and, at such borrower's failure to do so, authorizes the lender to
maintain such insurance at the borrower's cost and expense and to seek
reimbursement therefor from such borrower;

            (xxiv) There is no monetary default, breach, violation or event of
acceleration existing under the related Mortgage Loan. To Seller's knowledge,
there is no (A) non-monetary default, breach, violation or event of acceleration
existing under the related Mortgage Loan or (B) event (other than payments due
but not yet delinquent) which, with the passage of time or with notice and the
expiration of any grace or cure period, would constitute a default, breach,
violation or event of acceleration, which default, breach, violation or event of
acceleration, in the case of either (A) or (B), would materially and adversely
affect the use or value of the Mortgage Loan or the related Mortgaged Property.
Notwithstanding the foregoing, this representation and warranty does not address
or otherwise cover any default, breach, violation or event of acceleration that
specifically pertains to any matter otherwise covered by any other
representation or warranty made by Seller elsewhere in this Exhibit A or the
Exception Report;

            (xxv) No Mortgage Loan has been more than 30 days delinquent in
making required payments since origination and as of the Cut-off Date no
Mortgage Loan is 30 or more days delinquent in making required payments;

            (xxvi) (A) Each related Mortgage contains provisions so as to render
the rights and remedies of the holder thereof adequate for the practical
realization against the Mortgaged Property of the principal benefits of the
security, including realization by judicial or, if applicable, non-judicial
foreclosure or, subject to applicable state law requirements, appointment of a
receiver, and (B) there is no exemption available to the borrower which would
interfere with such right to foreclose, except, in the case of either (A) or
(B), as the enforcement of the Mortgage may be limited by bankruptcy,
insolvency, reorganization, moratorium, redemption or other laws affecting the
enforcement of creditors' rights or by general principles of equity (regardless
of whether such enforceability is considered in a proceeding in equity or at
law). No borrower is a debtor in a state or federal bankruptcy or insolvency
proceeding;

            (xxvii) At origination, each borrower represented and warranted in
all material respects that to its knowledge, except as set forth in certain
environmental reports and, except as commonly used in the operation and
maintenance of properties of similar kind and nature to the Mortgaged Property,
in accordance with prudent management practices and applicable law, and in a
manner that does not result in any contamination of the Mortgaged Property, it
has not used, caused or permitted to exist and will not use, cause or permit to
exist on the related Mortgaged Property any hazardous materials in any manner
which violates federal, state or local laws, ordinances, regulations, orders,
directives or policies governing the use, storage, treatment, transportation,
manufacture, refinement, handling, production or disposal of hazardous materials
or other environmental laws; and the related borrower agreed to indemnify,
defend and hold the mortgagee and its successors and assigns harmless from and
against losses, liabilities, damages, injuries, penalties, fines, expenses, and
claims of any kind whatsoever (including attorneys' fees and costs) paid,
incurred or suffered by, or asserted against, any such party resulting from a
breach of the foregoing representations, warranties or covenants given by the
borrower in connection with such Mortgage Loan. A Phase I environmental report
(or, with respect to residential cooperative loans with an original principal
balance of $350,000 or less, a transaction screen meeting ASTM standards) and,
with respect to certain Mortgage Loans, a Phase II environmental report was
conducted by a reputable independent environmental consulting firm in connection
with such Mortgage Loan, which report (or transaction screen) did not indicate
any material non-compliance with applicable environmental laws or material
existence of hazardous materials or, if any material non-compliance or material
existence of hazardous materials was indicated in any such report (or
transaction screen), then at least one of the following statements is true: (A)
funds reasonably estimated to be sufficient to cover the cost to cure any
material non-compliance with applicable environmental laws or material existence
of hazardous materials have been escrowed by the related borrower and held by
the related mortgagee; (B) if the environmental report recommended an operations
and maintenance plan, but not any material expenditure of funds, an operations
and maintenance plan has been required to be obtained by the related borrower;
(C) the environmental condition identified in the related environmental report
was remediated or abated in all material respects prior to the date hereof; (D)
a no further action or closure letter was obtained from the applicable
governmental regulatory authority (or the environmental issue affecting the
related Mortgaged Property was otherwise listed by such governmental authority
as "closed"); (E) such conditions or circumstances identified in the Phase I
environmental report were investigated further and based upon such additional
investigation, an environmental consultant recommended no further investigation
or remediation; (F) a party unrelated to the borrower with financial resources
reasonably estimated to be adequate to cure the condition or circumstance
provided a guaranty or indemnity to the related borrower to cover the costs of
any required investigation, testing, monitoring or remediation; (G) the
expenditure of funds reasonably estimated to be necessary to effect such
remediation is not greater than two percent (2%) of the outstanding principal
balance of the related Mortgage Loan; or (H) a lender's environmental insurance
policy was obtained and is a part of the related Mortgage File. Notwithstanding
the preceding sentence, with respect to certain Mortgage Loans with an original
principal balance of less than $3,000,000, no environmental report may have been
obtained, but (in such cases where a Phase I environmental report was not
obtained) a lender's secured creditor impaired property environmental insurance
policy was obtained with respect to each such Mortgage Loan. Each of such
secured creditor impaired property environmental insurance policies is a part of
the related Mortgage File. Each of such environmental insurance policies is in
full force and effect, is in an amount not less than the 100% of the balance of
the related Mortgage Loan, and has a term extending not less than five years
after the maturity date of the related Mortgage Loan; the premiums for such
policies have been paid in full; the Trustee is named as an insured under each
of such policies; and Seller has delivered to the insurer all related
environmental reports in its possession. To Seller's knowledge, in reliance on
the environmental reports referred to in the second sentence of this paragraph
(xxvii) and except as set forth in such environmental reports, each Mortgaged
Property is in material compliance with all applicable federal, state and local
environmental laws, and to Seller's knowledge, no notice of violation of such
laws has been issued by any governmental agency or authority, except, in all
cases, as indicated in such environmental reports or other documents previously
provided to the Rating Agencies; and Seller has not taken any action which would
cause the Mortgaged Property to not be in compliance with all federal, state and
local environmental laws pertaining to environmental hazards;

            (xxviii) (1) Each Mortgage Loan contains provisions for the
acceleration of the payment of the unpaid principal balance of such Mortgage
Loan if, without the consent of the holder of the Mortgage (and the Mortgage
requires the mortgagor to pay all fees and expenses associated with obtaining
such consent), the related Mortgaged Property is directly or indirectly
transferred or sold, and (2) except with respect to transfers of certain
interests in the related borrower to persons already holding interests in the
borrower, their family members, affiliated companies and other estate planning
related transfers that satisfy certain criteria specified in the related
Mortgage (which criteria is consistent with the practices of prudent commercial
mortgage lenders) or any transfers in connection with the death or disability of
owners of the borrower or, if the related Mortgaged Property is a residential
cooperative property, transfers of stock of the related borrower in connection
with the assignment of a proprietary lease for a unit in the related Mortgaged
Property by a tenant-shareholder of the related borrower to other persons who by
virtue of such transfers become tenant-shareholders in the related borrower,
each Mortgage Loan also contains the provisions for the acceleration of the
payment of the unpaid principal balance of such Mortgage Loan if, without the
consent of the holder of the Mortgage (and the Mortgage requires the mortgagor
to pay all fees and expenses associated with obtaining such consent), a majority
interest in the related borrower is directly or indirectly transferred or sold;

            (xxix) All improvements included in the related appraisal are within
the boundaries of the related Mortgaged Property, except for encroachments onto
adjoining parcels for which Seller has obtained title insurance against losses
arising therefrom or that do not materially and adversely affect the use or
value of such Mortgaged Property. No improvements on adjoining parcels encroach
onto the related Mortgaged Property except for encroachments that do not
materially and adversely affect the value of such Mortgaged Property, the
security provided by the Mortgage, the current use of the Mortgaged Property, or
the related borrower's operations at the Mortgaged Property;

            (xxx) The information pertaining to the Mortgage Loans which is set
forth in the Mortgage Loan Schedule attached as an exhibit to this Agreement is
complete and accurate in all material respects as of the dates of the
information set forth therein (or, if not set forth therein, as of the Cut-off
Date);

            (xxxi) With respect to any Mortgage Loan where all or any portion of
the estate of the related borrower therein is a leasehold estate under a ground
lease, and the related Mortgage does not also encumber the related lessor's fee
interest in such Mortgaged Property, based upon the terms of the ground lease
and any estoppel received from the ground lessor, Seller represents and warrants
that:

            (A)   The ground lease or a memorandum regarding such ground lease
                  has been duly recorded. The ground lease permits the interest
                  of the lessee to be encumbered by the related Mortgage and
                  does not restrict the use of the related Mortgaged Property by
                  such lessee, its successors or assigns in a manner that would
                  adversely affect the security provided by the related
                  Mortgage. To Seller's knowledge, there has been no material
                  change in the terms of the ground lease since its recordation,
                  except by any written instruments which are included in the
                  related mortgage file;

            (B)   The lessor under such ground lease has agreed in a writing
                  included in the related mortgage file that the ground lease
                  may not be amended, modified, canceled or terminated without
                  the prior written consent of the lender and that any such
                  action without such consent is not binding on the lender, its
                  successors or assigns;

            (C)   The ground lease has an original term (or an original term
                  plus one or more optional renewal terms, which, under all
                  circumstances, may be exercised, and would be enforceable, by
                  the lender) that extends not less than 10 years beyond the
                  amortization term of the related Mortgage Loan;

            (D)   Based on the title insurance policy (or binding commitment
                  therefor) obtained by Seller, the ground lease is not subject
                  to any liens or encumbrances superior to, or of equal priority
                  with, the Mortgage, subject to Permitted Encumbrances and
                  liens that encumber the ground lessor's fee interest;

            (E)   Under the terms of the ground lease, the ground lease is
                  assignable to the lender and its assigns without the consent
                  of the lessor thereunder;

            (F)   The ground lease is in full force and effect, Seller has no
                  actual knowledge that any default beyond applicable notice and
                  grace periods has occurred, and to Seller's knowledge, there
                  is no existing condition which, but for the passage of time or
                  giving of notice, would result in a default under the terms of
                  the ground lease;

            (G)   The ground lease or ancillary agreement, which is part of the
                  Mortgage File, between the lessor and the lessee requires the
                  lessor to give notice of any default by the lessee to the
                  lender;

            (H)   The lender is permitted a reasonable opportunity (including,
                  where necessary, sufficient time to gain possession of the
                  interest of the lessee under the ground lease through legal
                  proceedings, or to take other action so long as the lender is
                  proceeding diligently) to cure any default under the ground
                  lease which is curable after the receipt of notice of any
                  default before the lessor may terminate the ground lease. All
                  rights of the lender under the ground lease and the related
                  Mortgage (insofar as it relates to the ground lease) may be
                  exercised by or on behalf of the lender;

            (I)   The ground lease does not impose any restrictions on
                  subletting that would be viewed as commercially unreasonable
                  by a prudent commercial mortgage lender. The lessor is not
                  permitted to disturb the possession, interest or quiet
                  enjoyment of any subtenant of the lessee in the relevant
                  portion of the Mortgaged Property subject to the ground lease
                  for any reason, or in any manner, which would adversely affect
                  the security provided by the related Mortgage;

            (J)   Under the terms of the ground lease and the related Mortgage,
                  any related insurance proceeds or condemnation award (other
                  than in respect of a total or substantially total loss or
                  taking) will be applied either to the repair or restoration of
                  all or part of the related Mortgaged Property, with the lender
                  or a trustee appointed by it having the right to hold and
                  disburse such proceeds as repair or restoration progresses
                  (except in such cases where a provision entitling another
                  party to hold and disburse such proceeds would not be viewed
                  as commercially unreasonable by a prudent commercial mortgage
                  lender), or to the payment of the outstanding principal
                  balance of the Mortgage Loan, together with any accrued
                  interest, except that in the case of condemnation awards, the
                  ground lessor may be entitled to a portion of such award;

            (K)   Under the terms of the ground lease and the related Mortgage,
                  any related insurance proceeds, or condemnation award in
                  respect of a total or substantially total loss or taking of
                  the related Mortgaged Property will be applied first to the
                  payment of the outstanding principal balance of the Mortgage
                  Loan, together with any accrued interest (except as provided
                  by applicable law or in cases where a different allocation
                  would not be viewed as commercially unreasonable by a prudent
                  commercial mortgage lender, taking into account the relative
                  duration of the ground lease and the related Mortgage and the
                  ratio of the market value of the related Mortgaged Property to
                  the outstanding principal balance of such Mortgage Loan).
                  Until the principal balance and accrued interest are paid in
                  full, neither the lessee nor the lessor under the ground lease
                  will have an option to terminate or modify the ground lease
                  without the prior written consent of the lender as a result of
                  any casualty or partial condemnation; and

            (L)   Provided that the lender cures any defaults which are
                  susceptible to being cured, the lessor has agreed to enter
                  into a new lease upon termination of the ground lease for any
                  reason, including rejection of the ground lease in a
                  bankruptcy proceeding;

            (xxxii) With respect to any Mortgage Loan where all or a material
portion of the estate of the related borrower therein is a leasehold estate, but
the related Mortgage also encumbers the related lessor's fee interest in such
Mortgaged Property: (A) such lien on the related fee interest is evidenced by
the related Mortgage, (B) such Mortgage does not by its terms provide that it
will be subordinated to the lien of any other mortgage or encumbrance upon such
fee interest, (C) upon the occurrence of a default under the terms of such
Mortgage by the related borrower, any right of the related lessor to receive
notice of, and to cure, such default granted to such lessor under any agreement
binding upon the lender would not be considered commercially unreasonable in any
material respect by prudent commercial mortgage lenders, (D) the related lessor
has agreed in a writing included in the related Mortgage File that the related
ground lease may not be amended or modified without the prior written consent of
the lender and that any such action without such consent is not binding on the
lender, its successors or assigns, and (E) the related ground lease is in full
force and effect, and Seller has no actual knowledge that any default beyond
applicable notice and grace periods has occurred or that there is any existing
condition which, but for the passage of time or giving of notice, would result
in a default under the terms of such ground lease;

            (xxxiii) Except in the case of the CBA Mortgage Loans with respect
to those Mortgage Loans that are cross-collateralized or cross-defaulted, all
other loans that are cross-collateralized or cross-defaulted with such Mortgage
Loans are being transferred to Depositor hereunder;

            (xxxiv) Neither Seller nor any affiliate thereof has any obligation
to make any capital contribution to any borrower under a Mortgage Loan, other
than contributions made on or prior to the date hereof;

            (xxxv) (A) The Mortgage Loan is directly secured by a Mortgage on a
commercial property or multifamily residential property, and (B) the fair market
value of such real property, as evidenced by an appraisal satisfying the
requirements of FIRREA conducted within 12 months of the origination of the
Mortgage Loan, was at least equal to 80% of the principal amount of the Mortgage
Loan (1) at origination (or if the Mortgage Loan has been modified in a manner
that constituted a deemed exchange under Section 1001 of the Code at a time when
the Mortgage Loan was not in default or default with respect thereto was not
reasonably foreseeable, the date of the last such modification) or (2) at the
date hereof; provided that the fair market value of the real property must first
be reduced by (x) the amount of any lien on the real property interest that is
senior to the Mortgage Loan and (y) a proportionate amount of any lien that is
in parity with the Mortgage Loan (unless such other lien secures a Mortgage Loan
that is cross-collateralized with such Mortgage Loan, in which event the
computation described in (B) shall be made on an aggregated basis);

            (xxxvi) There are no subordinate mortgages encumbering the related
Mortgaged Property, nor are there any preferred equity interests held by the
lender or any mezzanine debt related to such Mortgaged Property, except as set
forth in the Prospectus Supplement, in this Exhibit A or in the Exception
Report;

            (xxxvii) Except in cases where the related Mortgaged Property is a
residential cooperative property, the Mortgage Loan Documents executed in
connection with each Mortgage Loan having an original principal balance in
excess of $5,000,000 require that the related borrower be a Single-Purpose
Entity (for this purpose, "Single-Purpose Entity" shall mean an entity, other
than an individual, having organizational documents which provide substantially
to the effect that it is formed or organized solely for the purpose of owning
and operating one or more Mortgaged Properties, is prohibited from engaging in
any business unrelated to such property and the related Mortgage Loan, does not
have any assets other than those related to its interest in the related
Mortgaged Property or its financing, or any indebtedness other than as permitted
under the related Mortgage Loan). To Seller's actual knowledge, each borrower
has fully complied with the requirements of the related Note and Mortgage and
borrower's organizational documents regarding Single-Purpose Entity status;

            (xxxviii) Except in cases where the related Mortgaged Property is a
residential cooperative property, each Mortgage Loan prohibits the related
borrower from mortgaging or otherwise encumbering the Mortgaged Property, or any
controlling equity interest in the borrower, without the prior written consent
of the mortgagee or the satisfaction of debt service coverage or similar
criteria specified in the Note or Mortgage which would be acceptable to a
reasonably prudent commercial mortgage lender, and, except in connection with
trade debt and equipment financings in the ordinary course of borrower's
business, from carrying any additional indebtedness, except, in each case, liens
contested in accordance with the terms of the Mortgage Loans or, with respect to
each Mortgage Loan having an original principal balance of less than $4,000,000,
any unsecured debt;

            (xxxix) Each borrower covenants in the Mortgage Loan Documents that
it shall remain in material compliance with all material licenses, permits and
other legal requirements necessary and required to conduct its business;

            (xl) Each Mortgaged Property (A) is located on or adjacent to a
dedicated road, or has access to an irrevocable easement permitting ingress and
egress, (B) is served by public utilities and services generally available in
the surrounding community or otherwise appropriate for the use in which the
Mortgaged Property is currently being utilized, and (C) constitutes one or more
separate tax parcels or is covered by an endorsement with respect to the matters
described in (A), (B) or (C) under the related title insurance policy (or the
binding commitment therefor);

            (xli) Based solely on a flood zone certification or a survey of the
related Mortgaged Property, if any portion of the improvements on the Mortgaged
Property is located in an area identified by the Federal Emergency Management
Agency or the Secretary of Housing and Urban Development as having special flood
hazards categorized as Zone "A" or Zone "V" and flood insurance is available,
the terms of the Mortgage Loan require the borrower to maintain flood insurance,
or at such borrower's failure to do so, authorizes the lender to maintain such
insurance at the cost and expense of the borrower and such insurance is in full
force and effect in an amount not less than the lesser of (A) the replacement
cost of the material improvements on such Mortgaged Property, (B) the balance of
the Mortgage Loan and (C) the maximum amount of insurance available under the
applicable National Flood Insurance Administration Program;

            (xlii) With respect to each Mortgage which is a deed of trust, a
trustee, duly qualified under applicable law to serve as such, currently so
serves and is named in the deed of trust or has been substituted in accordance
with applicable law or may be substituted in accordance with applicable law by
the related mortgagee, and except in connection with a trustee's sale after a
default by the related borrower, no fees are payable to such trustee, and such
fees payable are payable by the borrower;

            (xliii) Except as disclosed in the Exception Report to this
Agreement, to the knowledge of Seller as of the date hereof, there was no
pending action, suit or proceeding, arbitration or governmental investigation
against any borrower or Mortgaged Property, an adverse outcome of which would
materially and adversely affect such borrower's ability to perform under the
related Mortgage Loan;

            (xliv) No advance of funds has been made by Seller to the related
borrower (other than mezzanine debt and the acquisition of preferred equity
interests by the preferred equity interest holder, as disclosed in the
Prospectus Supplement), and no funds have, to Seller's knowledge, been received
from any person other than, or on behalf of, the related borrower, for, or on
account of, payments due on the Mortgage Loan;

            (xlv) To the extent required under applicable law, as of the Cut-off
Date or as of the date that such entity held the Note, each holder of the Note
was authorized to transact and do business in the jurisdiction in which each
related Mortgaged Property is located, or the failure to be so authorized did
not materially and adversely affect the enforceability of such Mortgage Loan;

            (xlvi) All collateral for the Mortgage Loans is being transferred as
part of the Mortgage Loans;

            (xlvii) Except as disclosed in the Exception Report or the
Prospectus Supplement with respect to the Crossed Mortgage Loans and Mortgage
Loans secured by multiple, non-contiguous real properties, no Mortgage Loan
requires the lender to release any portion of the Mortgaged Property from the
lien of the related Mortgage except upon (A) payment in full or defeasance of
the related Mortgage Loan, (B) the satisfaction of certain legal and
underwriting requirements that would be customary for prudent commercial
mortgage lenders, which in all events include payment of a release price at
least 125% of the appraised value of the property to be released or of the
allocated loan amount of such property, (C) releases of unimproved out-parcels
or (D) releases of other portions of the Mortgaged Property which will not have
a material adverse effect on the use or value of the collateral for the related
Mortgage Loan and which were given no value in the appraisal of the Mortgaged
Property or of that portion of the Mortgaged Property used to calculate the
loan-to-value ratio of the Mortgaged Property for underwriting purposes. No
release or partial release of any Mortgaged Property, or any portion thereof,
expressly permitted or required pursuant to the terms of any Mortgage Loan would
constitute a significant modification of the related Mortgage Loan under Treas.
Reg. Section 1.860G-2(b)(2);

            (xlviii) Any insurance proceeds in respect of a casualty loss or
taking will be applied either to (A) the repair or restoration of all or part of
the related Mortgaged Property, with, in the case of all casualty losses or
takings in excess of a specified amount or percentage of the related loan amount
that a prudent commercial lender would deem satisfactory and acceptable, the
lender (or a trustee appointed by it) having the right to hold and disburse such
proceeds as the repair or restoration progresses (except in any case where a
provision entitling another party to hold and disburse such proceeds would not
be viewed as commercially unreasonable by a prudent commercial mortgage lender)
or (B) to the payment of the outstanding principal balance of such Mortgage Loan
together with any accrued interest thereon;

            (xlix) Each UCC Financing Statement, if any, filed with respect to
personal property constituting a part of the related Mortgaged Property and each
assignment, if any, of such UCC Financing Statement to Seller was, and each
assignment, if any, of such UCC Financing Statement in blank which the Trustee
or its designee is authorized to complete (but for the insertion of the name of
the assignee and any related filing information which is not yet available to
Seller) is, in suitable form for filing in the filing office in which such UCC
Financing Statement was filed;

            (l) To Seller's knowledge, (A) each commercial lease covering more
than 10% (20% in the case of any Mortgage Loan having an original principal
balance less than $2,500,000) of the net leaseable area of the related Mortgaged
Property is in full force and effect and (B) there exists no default under any
such commercial lease either by the lessee thereunder or by the related borrower
that could give rise to the termination of such lease;

            (li) Based upon an opinion of counsel and/or other due diligence
considered reasonable by prudent commercial mortgage lenders in the lending area
where the subject property is located, the improvements located on or forming
part of each Mortgaged Property comply with applicable zoning laws and
ordinances, or constitute a legal non-conforming use or structure or, if any
such improvement does not so comply, such non-compliance does not materially and
adversely affect the value of the related Mortgaged Property. With respect to
Mortgage Loans with a Cut-off Date Principal Balance of over $10,000,000, if the
related Mortgaged Property does not so comply, to the extent Seller is aware of
such non-compliance, it has required the related borrower to obtain law and
ordinance insurance coverage in amounts customarily required by prudent
commercial mortgage lenders;

            (lii) Each Mortgage Loan constitutes a "qualified mortgage" within
the meaning of Section 860G(a)(3) of the Code (but without regard to the rule in
Treasury Regulation (as defined herein) Section 1.860G-2(f)(2) that treats a
defective obligation as a qualified mortgage or any substantially similar
successor provision), the related Mortgaged Property, if acquired by a REMIC in
connection with the default or imminent default of such Mortgage Loan would
constitute "foreclosure property" within the meaning of Code Section 860G(a)(8)
and all Prepayment Premiums and Yield Maintenance Charges with respect to such
Mortgage Loan constitute "customary prepayment penalties" within the meaning of
Treasury Regulation Section 1.860G-1(b)(2);

            (liii) With respect to any Mortgage Loan that pursuant to the
Mortgage Loan Documents can be defeased, (A) the Mortgage Loan cannot be
defeased within two years after the Closing Date, (B) the borrower can pledge
only United States government securities in an amount sufficient to make all
scheduled payments under the Mortgage Loan when due, (C) the borrower is
required to provide independent certified public accountant's certification that
the collateral is sufficient to make such payments, (D) the loan may be required
to be assumed by a single-purpose entity designated by the holder of the
Mortgage Loan, (E) the borrower is required to provide an opinion of counsel
that the trustee has a perfected security interest in such collateral prior to
any other claim or interest, (F) the borrower is required to pay all Rating
Agency fees associated with defeasance (if rating confirmation is a specific
condition precedent thereto) and all other reasonable expenses associated with
defeasance, including, but not limited to, accountant's fees and opinions of
counsel, (G) with respect to any Significant Loan (as defined in the Pooling and
Servicing Agreement), the borrower is required to provide an opinion of counsel
that such defeasance will not cause any REMIC created under the Pooling and
Servicing Agreement to fail to qualify as a REMIC for federal or applicable
state tax purposes and (H) with respect to any Significant Loan (as defined in
the Pooling and Servicing Agreement), the borrower must obtain confirmation from
each Rating Agency that the defeasance would not result in such Rating Agency's
withdrawal, downgrade or qualification of the then current rating of any class
of Certificates rated by such Rating Agency;

            (liv) The Mortgage Loan Documents for each Mortgage Loan provide
that the related borrower thereunder shall be liable to the lender for any
losses incurred by the lender due to (A) the misapplication or misappropriation
of rents, insurance proceeds or condemnation awards, (B) any willful act of
material waste, (C) any breach of the environmental covenants contained in the
related Mortgage Loan Documents, and (D) fraud by the related borrower; provided
that, with respect to clause (C) of this sentence, an indemnification against
losses related to such violations or environmental insurance shall satisfy such
requirement; and provided, further, that, if the related Mortgaged Property is a
residential cooperative property, then the subject Mortgage Loan is fully
recourse to the borrower;

            (lv) If such Mortgage Loan is an ARD Loan, it commenced amortizing
on its initial scheduled Due Date and provides that: (A) its Mortgage Rate will
increase by no less than two percentage points in connection with the passage of
its Anticipated Repayment Date and so long as the Mortgage Loan is an asset of
the Trust Fund; (B) its Anticipated Repayment Date is not less than seven years
following the origination of such Mortgage Loan; (C) no later than the related
Anticipated Repayment Date, if it has not previously done so, the related
borrower is required to enter into a "lockbox agreement" whereby all revenue
from the related Mortgaged Property shall be deposited directly into a
designated account controlled by the applicable Master Servicer; and (D) any
cash flow from the related Mortgaged Property that is applied to amortize such
Mortgage Loan following its Anticipated Repayment Date shall, to the extent such
net cash flow is in excess of the Monthly Payment payable therefrom, be net of
budgeted and discretionary (servicer approved) capital expenditures;

            (lvi) Except as disclosed in the Prospectus Supplement, no Mortgage
Loan, and no group of Mortgage Loans made to the same borrower and to borrowers
that are Affiliates, accounted for more than 5.0% of the aggregate of the
Cut-off Date Principal Balances of all of the mortgage loans (including the
Mortgage Loans) sold to Depositor and Column Financial, Inc., LaSalle Bank
National Association, KeyBank National Association, NCB, FSB, and Barclays
Capital Real Estate Inc. pursuant to those certain Mortgage Loan Purchase
Agreements, each dated as of September 1, 2006, between Depositor and Column
Financial, Inc., LaSalle Bank National Association, KeyBank National
Association, NCB, FSB, and Barclays Capital Real Estate Inc., respectively, as
of the Cut-off Date;

            (lvii) Except for the Mortgage Loans with an initial principal
balance less than $3,000,000, in connection with its origination or acquisition
of each Mortgage Loan, Seller obtained an appraisal of the related Mortgaged
Property, which appraisal is signed by an appraiser, who, to Seller's actual
knowledge, had no interest, direct or indirect, in the borrower, the Mortgaged
Property or in any loan made on the security of the Mortgaged Property, and
whose compensation was not affected by the approval or disapproval of the
Mortgage Loan; and

            (lviii) Each Mortgage Loan bears interest at a rate that remains
fixed throughout the remaining term of such Mortgage Loan, except in the case of
an ARD Loan after its Anticipated Repayment Date and except for the imposition
of a default rate.

<PAGE>

                                                                       EXHIBIT B

                             AFFIDAVIT OF LOST NOTE

STATE OF NEW YORK       )
                        ) ss.:
COUNTY OF NEW YORK      )

            __________, being duly sworn, deposes and says:

            1. that he is an authorized signatory of KeyBank National
Association ("KeyBank");

            2. that _______________ is the owner and holder of a mortgage loan
in the original principal amount of $______________ secured by a mortgage (the
"Mortgage") on the premises known as ______________ ______________ located in
______________;

            3. that _______________, after having conducted a diligent
investigation of its records and files, has been unable to locate the following
original note and believes that said original note has been lost, misfiled,
misplaced or destroyed due to a clerical error:

            a note in the original sum of $______________ made by
            ______________, to _______________, under date of ______________
            (the "Note");

            4. that the Note is now owned and held by _______________;

            5. that the copy of the Note attached hereto is a true and correct
copy thereof;

            6. that the Note has not been paid off, satisfied, assigned,
transferred, encumbered, endorsed, pledged, hypothecated, or otherwise disposed
of and that the original Note has been either lost, misfiled, misplaced or
destroyed;

            7. that no other person, firm, corporation or other entity has any
right, title, interest or claim in the Note except _______________; and

            8. upon assignment of the Note by _______________ to Credit Suisse
First Boston Mortgage Securities Corp. (the "Depositor") and subsequent
assignment by Depositor to the trustee for the benefit of the holders of the
Credit Suisse First Boston Mortgage Securities Corp. Commercial Mortgage
Pass-Through Certificates, Series 2006-C4 (the "Trustee") (which assignment may,
at the discretion of Depositor, be made directly by _______________ to the
Trustee), _______________ covenants and agrees (a) promptly to deliver to the
Trustee the original Note if it is subsequently found, and (b) to indemnify and
hold harmless the Trustee and its successors and assigns from and against any
and all costs, expenses and monetary losses arising as a result of
_______________'s failure to deliver said original Note to the Trustee.

                                    KEYBANK NATIONAL ASSOCIATION

                                    By:
                                       -----------------------------
                                       Name:
                                       Title:

Sworn to before me this _____
day of __________, 2006

<PAGE>

Credit Suisse First Boston Mortgage Securities Corp.
Commercial Mortgage Pass-Through Certificates Series 2006-C4

<TABLE>
<CAPTION>

      Loan
      Group
#     #       Property Name                           Address
---   -----   -------------------------------------   -----------------------------------------------
<S>   <C>     <C>                                     <C>
  7       1   Springdale Center                       3250 Airport Boulevard
  8       1   Chicopee Marketplace Shopping Center    591 Memorial Drive
  9       1   Wilkes-Barre Towne Marketplace          2150 Wilkes-Barre Township Marketplace
 10       1   Cobblestone Village                     10233 Okeechobee Boulevard
 11       1   Fashion Square Shopping Center          1756 Wells Road
 21       1   Baldwin Commons                         4846 Baldwin Road
 26       1   Three City Center                       180 South Clinton Avenue
 27       1   Lazy Boy Distribution Center            2203 Sherrill Drive
 28       1   Jacobson Warehouse                      749 Southrock Drive and 3686 South Central
 29       1   Center at Hobbs Brook                   100 Charlton Road
 37       1   Sunland Towne Centre                    655 Sunland Park Drive
 41       1   Four Gateway                            444 North 44th Street
 45       1   Northville Retail Center                17101-17677 Haggerty Road
 46       1   Ludlam Point Apartments                 6850-6920 SW 44th Street
 47       1   Pacific Property                        1151-1157 S. Maple Avenue & 1158-1162
                                                      Santee Street & 301-329 E. 12th St.
 54       1   Amity Plaza                             112-160 Amity Road
 55       1   Brainard Place Medical Campus           29001 and 29017 Cedar Road
 63       1   StorQuest Self Storage                  46600 Adams Street
 66       1   Lakeside Terrace Shopping Center        26150-26220 Iris Avenue
 74       1   The Art Institute                       3601 West Sunflower Avenue
 80       1   Beck Business Center                    28221, 28243, 28265 and 28287 Beck Road
 93       1   Sully Tech Center                       14119 Sullyfield Circle
 97       1   Stanley Square                          7908 - 8038 West 151st Street
100       1   Stor-More Auburn                        1802 "A" Street Southeast
105       1   StorHouse Self-Storage                  2829 Northeast 3rd Street
108       2   Colonial Heights Apartments             976 6th Lane
110       1   8401 New Trails Drive Office Building   8401 New Trails Drive
115       1   Latham CVS                              746 and 752 Loudon Road, and 38 Kunker Road
119       1   Mallory Commons                         4091 Mallory Lane
121       2   Fox & Hounds Apartments                 325 Foxfire Drive
122       1   Deer Creek Woods Buildings 5S & 6S      7100-7112 West 135th Street and
                                                      13420-13448 Metcalf Avenue
123       1   StoragePro                              8855 San Leandro Street
152       1   Shoppes at Brantley Hall                990 North State Road 434
161       1   1980 Gallows Road Office                1980 Gallows Road
181       1   Linkletter Self-Storage Facility        42130 Lyndie Lane
202       1   Lyndie Lane Office Center               42145 Lyndie Lane
205       1   Post Road                               1996-2070 Post Road (Route 1)
218       1   Ward Parkway Plaza                      8430-8440 Ward Parkway
243       1   Burlington & East 19th Buildings        405 East 19th Avenue and 1925 Burlington Road
261       1   Lake Shore Plaza                        21401 Powerline Road
269       1   Shepard Building                        104 Armour Road
274       1   The Shoppes at Provo Town Center        1316 South University Avenue
283       1   East 60 Village                         S/s of East State Road 60, East of Valrico Road

<CAPTION>
                                                                          Units/
                                                                          Sq. Ft./                               Orig
                                                   Zip     Property       Rooms/     Original      Cut-off       Amort.
#     City                  County         State   Code    Type           Pads       Balance       Balance (1)   Term
---   -------------------   ------------   -----   -----   ------------   --------   -----------   -----------   -------------
<S>   <C>                   <C>            <C>     <C>     <C>            <C>        <C>           <C>           <C>
  7   Mobile                Mobile         AL      36606   Retail          565,951   $36,907,000   $36,907,000   Interest Only
  8   Chicopee              Hampden        MA      01020   Retail          121,220   $17,415,000   $17,415,000   Interest Only
  9   Wilkes-Barre          Luzerne        PA      18702   Retail          309,770   $10,613,000   $10,613,000   Interest Only
 10   West Palm Beach       Palm Beach     FL      33411   Retail           33,207    $9,994,000    $9,994,000   Interest Only
 11   Orange Park           Clay           FL      32073   Retail           37,093    $7,517,000    $7,517,000   Interest Only
 21   Orion Township        Oakland        MI      48359   Retail          345,137   $46,000,000   $46,000,000   Interest Only
 26   Rochester             Monroe         NY      14604   Office          226,000   $18,800,000   $18,800,000             360
 27   Statesville           Iredell        NC      28625   Industrial      639,000   $14,100,000   $14,100,000             360
 28   Rockford              Winnebago      IL      61102   Industrial      240,000    $6,900,000    $6,900,000             360
 29   Sturbridge            Worcester      MA      01566   Retail          231,016   $37,200,000   $37,200,000             360
 37   El Paso               El Paso        TX      79912   Retail          302,481   $25,000,000   $25,000,000             360
 41   Phoenix               Maricopa       AZ      85008   Office          138,240   $21,760,000   $21,760,000             360
 45   Northville Township   Wayne          MI      48168   Retail          180,791   $19,000,000   $19,000,000   Interest Only
 46   Miami                 Miami-Dade     FL      33155   Multifamily         205   $18,924,000   $18,924,000   Interest Only
 47   Los Angeles           Los Angeles    CA      90015   Retail           30,740   $18,750,000   $18,669,738             360

 54   New Haven             New Haven      CT      06515   Retail          179,566   $17,300,000   $17,300,000             360
 55   Lyndhurst             Cuyahoga       OH      44124   Office          115,499   $17,200,000   $17,200,000             360
 63   La Quinta             Riverside      CA      92253   Self Storage    124,635   $14,200,000   $14,200,000             360
 66   Moreno Valley         Riverside      CA      92555   Retail           56,166   $13,638,000   $13,627,599             360
 74   Santa Ana             Orange         CA      92704   Office           53,484   $11,600,000   $11,600,000             360
 80   Wixom                 Oakland        MI      48393   Industrial      170,150   $10,300,000   $10,300,000             360
 93   Chantilly             Fairfax        VA      20151   Industrial       88,427    $7,600,000    $7,600,000   Interest Only
 97   Overland Park         Johnson        KS      66223   Retail           72,083    $7,372,000    $7,366,223             360
100   Auburn                King           WA      98002   Self Storage    124,156    $7,000,000    $7,000,000   Interest Only
105   Renton                King           WA      98056   Self Storage     98,776    $6,500,000    $6,500,000             360
108   Vero Beach            Indian River   FL      32962   Multifamily          85    $6,300,000    $6,290,365             360
110   The Woodlands         Montgomery     TX      77381   Office           71,000    $6,240,000    $6,240,000             360
115   Latham                Albany         NY      12110   Retail           14,865    $6,000,000    $5,982,324             360
119   Franklin              Williamson     TN      37067   Retail           29,626    $5,750,000    $5,750,000             360
121   Oxford                Butler         OH      45056   Multifamily          98    $5,500,000    $5,500,000             360
122   Overland Park         Johnson        KS      66223   Retail           19,390    $5,360,000    $5,360,000             360

123   Oakland               Alameda        CA      94621   Self Storage     67,790    $5,300,000    $5,300,000             360
152   Altamonte Springs     Seminole       FL      32714   Retail           33,580    $4,075,000    $4,075,000             360
161   Vienna                Fairfax        VA      22182   Office           26,438    $3,950,000    $3,937,451             264
181   Temecula              Riverside      CA      92591   Self Storage     56,251    $3,600,000    $3,597,351             360
202   Temecula              Riverside      CA      92591   Office           26,970    $3,050,000    $3,050,000             360
205   Fairfield             Fairfield      CT      06824   Mixed Use        27,772    $3,000,000    $3,000,000             360
218   Kansas City           Jackson        MO      64114   Retail           14,000    $2,750,000    $2,750,000   Interest Only
243   North Kansas City     Clay           MO      64116   Office           30,299    $2,340,000    $2,336,293             360
261   Boca Raton            Palm Beach     FL      33433   Retail            9,000    $2,153,000    $2,149,689             360
269   North Kansas City     Clay           MO      64116   Office           21,043    $2,000,000    $1,996,831             360
274   Provo                 Utah           UT      84601   Retail            8,285    $1,930,000    $1,927,693             300
283   Valrico               Hillsborough   FL      33594   Retail            8,484    $1,720,000    $1,718,756             360

<CAPTION>

      Rem.            Orig           Rem.                           Net                                               First
      Amort.          Term to        Term to            Interest    Interest    Interest Calculation    Monthly       Payment
#     Term (1)        Maturity (2)   Maturity (1) (2)   Rate        Rate        (30/360 / Actual/360)   Payment (3)   Date
---   -------------   ------------   ----------------   --------    --------    ---------------------   -----------   ---------
<S>   <C>             <C>            <C>                <C>         <C>         <C>                     <C>           <C>
  7   Interest Only            120                117      5.970%      5.919%   30/360                     $183,612   7/1/2006
  8   Interest Only            120                117      5.970%      5.919%   30/360                      $86,640   7/1/2006
  9   Interest Only            120                117      5.970%      5.919%   30/360                      $52,800   7/1/2006
 10   Interest Only            120                117      5.970%      5.919%   30/360                      $49,720   7/1/2006
 11   Interest Only            120                117      5.970%      5.919%   30/360                      $37,397   7/1/2006
 21   Interest Only            120                118      6.050%      5.999%   Actual/360                 $235,138   8/1/2006
 26             360            120                119      6.210%      6.159%   Actual/360                 $115,266   9/1/2006
 27             360            120                119      6.210%      6.159%   Actual/360                  $86,450   9/1/2006
 28             360            120                119      6.210%      6.159%   Actual/360                  $42,305   9/1/2006
 29             360            120                118      6.110%      6.059%   Actual/360                 $225,670   8/1/2006
 37             360            120                118      6.010%      5.959%   Actual/360                 $150,048   8/1/2006
 41             360            120                118      6.130%      6.079%   Actual/360                 $132,286   8/1/2006
 45   Interest Only            120                118      5.720%      5.669%   Actual/360                  $91,825   8/1/2006
 46   Interest Only            120                117      6.270%      6.219%   Actual/360                 $100,251   7/1/2006
 47             355            120                115      6.240%      6.189%   Actual/360                 $115,325   5/1/2006

 54             360            120                120      6.200%      6.149%   Actual/360                 $105,957   10/1/2006
 55             360            120                119      6.110%      6.059%   Actual/360                 $104,342   9/1/2006
 63             360            120                118      6.240%      6.139%   Actual/360                  $87,340   8/1/2006
 66             359             84                 83      6.310%      6.259%   Actual/360                  $84,504   9/1/2006
 74             360            120                118      6.290%      6.189%   Actual/360                  $71,725   8/1/2006
 80             360            120                119      6.200%      6.099%   Actual/360                  $63,084   9/1/2006
 93   Interest Only            120                119      6.180%      6.129%   Actual/360                  $39,684   9/1/2006
 97             359            120                119      6.210%      6.159%   Actual/360                  $45,199   9/1/2006
100   Interest Only            120                118      5.900%      5.849%   Actual/360                  $34,895   8/1/2006
105             360            120                119      5.980%      5.929%   Actual/360                  $38,887   9/1/2006
108             358            120                118      6.310%      6.259%   Actual/360                  $39,036   8/1/2006
110             360            120                116      6.190%      6.139%   Actual/360                  $38,178   6/1/2006
115             357            120                117      5.570%      5.519%   Actual/360                  $34,331   7/1/2006
119             360            120                118      6.120%      6.069%   Actual/360                  $34,919   8/1/2006
121             360            120                113      5.690%      5.589%   Actual/360                  $31,887   3/1/2006
122             360            120                116      5.620%      5.569%   Actual/360                  $30,838   6/1/2006

123             360            120                117      5.770%      5.719%   Actual/360                  $30,997   7/1/2006
152             360            120                120      5.970%      5.919%   Actual/360                  $24,353   10/1/2006
161             262            120                118      6.300%      6.249%   Actual/360                  $27,686   8/1/2006
181             359            120                119      6.440%      6.389%   Actual/360                  $22,613   9/1/2006
202             360            120                120      6.450%      6.399%   Actual/360                  $19,178   10/1/2006
205             360            117                115      6.590%      6.519%   Actual/360                  $19,140   8/1/2006
218   Interest Only            120                119      6.160%      6.059%   Actual/360                  $14,313   9/1/2006
243             358            120                118      6.180%      6.079%   Actual/360                  $14,301   8/1/2006
261             358            120                118      6.290%      6.239%   Actual/360                  $13,312   8/1/2006
269             358            120                118      6.180%      6.079%   Actual/360                  $12,223   8/1/2006
274             299            120                119      6.330%      6.279%   Actual/360                  $12,827   9/1/2006
283             359            120                119      6.500%      6.449%   Actual/360                  $10,872   9/1/2006

<CAPTION>
                                                                                                               Servicing
                                                                                                               and
      Maturity                                       Letter of    Ground   Earthquake        Environmental     Trustee
#     Date       ARD (4)    Lockout/Defeasance (5)   Credit       Lease    Insurance (Y/N)   Insurance (Y/N)   Fees
---   --------   --------   ----------------------   ----------   ------   ---------------   ---------------   ---------
<S>   <C>        <C>        <C>                      <C>          <C>      <C>               <C>               <C>
  7   6/1/2016   N/A        Yes                              $0   N/A      Yes               N/A                0.050600%
  8   6/1/2016   N/A        Yes                              $0   N/A      Yes               N/A                0.050600%
  9   6/1/2016   N/A        Yes                              $0   Yes      Yes               N/A                0.050600%
 10   6/1/2016   N/A        Yes                      $1,850,000   N/A      Yes               N/A                0.050600%
 11   6/1/2016   N/A        Yes                              $0   N/A      Yes               N/A                0.050600%
 21   7/1/2036   7/1/2016   Yes                              $0   N/A      N/A               N/A                0.050600%
 26   8/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
 27   8/1/2016   N/A        Yes                              $0   N/A      Yes               N/A                0.050600%
 28   8/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
 29   7/1/2016   N/A        Yes                              $0   N/A      Yes               N/A                0.050600%
 37   7/1/2016   N/A        Yes                              $0   N/A      Yes               N/A                0.050600%
 41   7/1/2016   N/A        Yes                              $0   N/A      Yes               N/A                0.050600%
 45   7/1/2036   7/1/2016   Yes                              $0   N/A      N/A               N/A                0.050600%
 46   6/1/2016   N/A        No                               $0   N/A      N/A               N/A                0.050600%
 47   4/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%

 54   9/1/2016   N/A        Yes                              $0   N/A      N/A               Yes                0.050600%
 55   8/1/2016   N/A        No                               $0   N/A      N/A               N/A                0.050600%
 63   7/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.100600%
 66   8/1/2013   N/A        No                               $0   N/A      N/A               N/A                0.050600%
 74   7/1/2036   7/1/2016   Yes                              $0   N/A      N/A               N/A                0.100600%
 80   8/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.100600%
 93   8/1/2016   N/A        Yes                              $0   N/A      Yes               N/A                0.050600%
 97   8/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
100   7/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
105   8/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
108   7/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
110   5/1/2036   5/1/2016   Yes                              $0   N/A      Yes               N/A                0.050600%
115   6/1/2036   6/1/2016   Yes                              $0   N/A      N/A               N/A                0.050600%
119   7/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
121   2/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.100600%
122   5/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%

123   6/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
152   9/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
161   7/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
181   8/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
202   9/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
205   4/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.070600%
218   8/1/2016   N/A        Yes                              $0   N/A      Yes               N/A                0.100600%
243   7/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.100600%
261   7/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
269   7/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.100600%
274   8/1/2016   N/A        Yes                              $0   N/A      N/A               N/A                0.050600%
283   8/1/2016   N/A        No                               $0   N/A      N/A               N/A                0.050600%

<CAPTION>

#     Loan Seller
---   ----------------------------
<S>   <C>
  7   KeyBank National Association
  8   KeyBank National Association
  9   KeyBank National Association
 10   KeyBank National Association
 11   KeyBank National Association
 21   KeyBank National Association
 26   KeyBank National Association
 27   KeyBank National Association
 28   KeyBank National Association
 29   KeyBank National Association
 37   KeyBank National Association
 41   KeyBank National Association
 45   KeyBank National Association
 46   KeyBank National Association
 47   KeyBank National Association

 54   KeyBank National Association
 55   KeyBank National Association
 63   KeyBank National Association
 66   KeyBank National Association
 74   KeyBank National Association
 80   KeyBank National Association
 93   KeyBank National Association
 97   KeyBank National Association
100   KeyBank National Association
105   KeyBank National Association
108   KeyBank National Association
110   KeyBank National Association
115   KeyBank National Association
119   KeyBank National Association
121   KeyBank National Association
122   KeyBank National Association

123   KeyBank National Association
152   KeyBank National Association
161   KeyBank National Association
181   KeyBank National Association
202   KeyBank National Association
205   KeyBank National Association
218   KeyBank National Association
243   KeyBank National Association
261   KeyBank National Association
269   KeyBank National Association
274   KeyBank National Association
283   KeyBank National Association
</TABLE>

(1)   Assumes a Cut-off Date in September 2006.

(2)   In the case of the ARD Loans, the anticipated repayment date is assumed to
      be the maturity date for the purposes of the indicated column.

(3)   For mortgage loans classified as interest only, the monthly payments
      represent the average of one full year of interest payments. For mortgage
      loans with an initial interest only term, the monthly payments represent
      the principal and interest payments du

(4)   Anticipated Repayment Date.

(5)   Yes means that defeasance is permitted notwithstanding the Lockout Period.Exhibit 10.4

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

              CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
                                   (Depositor)

                                       and

                        BARCLAYS CAPITAL REAL ESTATE INC.
                                    (Seller)
                     ---------------------------------------

                        MORTGAGE LOAN PURCHASE AGREEMENT

                          Dated as of September 1, 2006

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

--------------------------------------------------------------------------------
<PAGE>

                                TABLE OF CONTENTS

                                                                          Page
                                                                          ----
Section 1.  Transactions on or Prior to the Closing Date.....................1
Section 2.  Closing Date Actions.............................................1
Section 3.  Conveyance of Mortgage Loan......................................2
Section 4.  Depositor's Conditions to Closing................................8
Section 5.  Seller's Conditions to Closing..................................10
Section 6.  Representations and Warranties of Seller........................10
Section 7.  Obligations of Seller...........................................14
Section 8.  Crossed Mortgage Loans..........................................18
Section 9.  Rating Agency Fees; Costs and Expenses Associated with a
            Defeasance......................................................18
Section 10. Representations and Warranties of Depositor.....................19
Section 11. Survival of Certain Representations, Warranties and Covenants...19
Section 12. Transaction Expenses............................................20
Section 13. Recording Costs and Expenses....................................20
Section 14. Notices.........................................................20
Section 15. Notice of Exchange Act Reportable Events........................20
Section 16. Examination of Mortgage Files...................................21
Section 17. Successors......................................................21
Section 18. Governing Law...................................................21
Section 19. Severability....................................................21
Section 20. Further Assurances..............................................21
Section 21. Counterparts....................................................21
Section 22. Treatment as Security Agreement.................................21
Section 23. Recordation of Agreement........................................23

Schedule I.. Schedule of Transaction Terms
Schedule II. Mortgage Loan Schedule for the Mortgage Loan
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 Loan
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 BARCLAYS CAPITAL REAL ESTATE 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
its 50% pari passu interest in the mortgage loan identified on the schedule,
which such 50% interest is evidenced by a separate note in the original
principal amount of $90,500,000 (the "Mortgage Loan Schedule") annexed hereto as
Schedule II (the "Mortgage Loan"). Depositor intends to deposit the Mortgage
Loan 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 File with respect
to the Mortgage Loan 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, it being understood that the
delivery of such Mortgage File by Seller or Column Financial, Inc. shall satisfy
the delivery requirements of Seller hereunder (including for purposes of Section
3) with regard to the Mortgage Loan except with regard to the Seller's note;
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 Loan shall
take place on the Closing Date, subject to and simultaneously with the deposit
of the Mortgage Loan 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 Loan 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 Loan 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 Loan. 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)
the Mortgage Loan 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 Loan 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 Loan 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 the Mortgage Loan shall contain the following documents on a collective
basis:

            (a) the original Note (or with respect to the Mortgage Loan 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 Loan 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) Reserved;

            (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 the
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
the 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
the 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 the 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 (or its designee) 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 the Mortgage Loan 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. The Servicer File shall contain all
documents and records in Seller's possession relating to the Mortgage Loan
(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; provided, however, it being understood that the delivery of
such Servicer File by Seller or Column Financial, Inc. shall satisfy the
delivery requirements of Seller hereunder with regard to the Mortgage Loan
except with regard to Seller's note.

            In addition, with respect to the 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 Loan 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 Loan, 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 Loan 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 Loan
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 Loan to Depositor, as provided herein, as a sale of the Mortgage Loan
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 Loan 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 Loan has been transferred
to Depositor and are no longer available to satisfy claims of Seller's
creditors.

            After Seller's transfer of the Mortgage Loan 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
Loan. 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 Loan by Seller
to Depositor.

            Section 4. Depositor's Conditions to Closing. The obligations of
Depositor to purchase the Mortgage Loan 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 the Mortgage Loan and related Mortgage File 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 File, 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 Loan 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 Loan 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 Loan.

            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 Loan owned by it 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 Loan owned by
      Seller.

            (iv) Seller is solvent and the sale of the Mortgage Loan (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 Loan, 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 Loan, 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 Loan, Seller is
      receiving new value. The consideration received by Seller upon the sale of
      the Mortgage Loan owned by it constitutes at least fair consideration and
      reasonably equivalent value for the Mortgage Loan.

            (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 Loan
      pursuant to this Agreement are not subject to the bulk transfer or similar
      statutory provisions in effect in any applicable jurisdiction. The
      Mortgage Loan does 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 Loan 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 Loan.

            (xiii) As of the Time of Sale (as defined in the Barclays
      Indemnification Agreement) the information set forth in any Disclosure
      Information (as defined in the Barclays Capital Real Estate Inc.
      Indemnification Agreement), as last forwarded to each prospective investor
      at or prior to the Time of Sale (as defined in the LaSalle Indemnification
      Agreement), (A) 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 (B) satisfies the requirements of Items 1111 (but excluding
      Items 1111(a)(6), 1111(b)(14) and 1111(e)), 1117 and 1119 of Regulation AB
      (as defined in the Barclays Indemnification Agreement); but only to the
      extent that (X) such information relates to the Mortgage Loan and is
      contained in the Master Tape (as defined in the Barclays Indemnification
      Agreement) or, to the extent consistent therewith, the Diskette (as
      defined in the Barclays Indemnification Agreement) or (Y) such information
      regarding the Seller or the Mortgage Loan was contained in the
      Confidential Offering Circular or the Prospectus Supplement under the
      headings "Summary of Prospectus Supplement--Relevant Parties/Entities,"
      "--Mortgage Loan Seller," "--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 Loan contained
      in the Loan Detail, provided that, the Seller makes no representation or
      warranty to the extent that any such untrue statement or omission or
      alleged untrue statement or omission was made as a result of an error in
      the manipulation of, or an error in any calculations based upon, or an
      error in any aggregation (other than an aggregation made in the Master
      Tape by the Seller) of, the numerical, financial and/or statistical
      information regarding the Mortgage Loan Seller Information (as defined in
      the Barclays Indemnification Agreement).

            (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
(subject to exceptions disclosed at such time) (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 Loan 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 File or other documents evidencing or relating to the Mortgage Loan 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 Loan 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 Loan, 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 Schedule V) 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 representation 39 set forth on Exhibit A hereto, that the
related Mortgage Loan Documents require the related Borrower to bear the
reasonable costs and expenses associated with defeasance or assumption of the
Mortgage Loan, 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 Loan 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.

            In the event that the Mortgage Loan is repurchased pursuant to this
Section 7 and the other related mortgage note is not repurchased by Column
Financial, Inc. and such Mortgage Loan remains in the Trust, the Seller and the
Depositor hereby agree that the provisions in Section 3.34 of the Pooling and
Servicing Agreement shall govern the servicing and administration of such
Mortgage Loan, the repurchased note, and the other related mortgage note not so
repurchased, and the Seller's and the Depositor's right and obligations with
respect thereto.

            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 (39) 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
(39) 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. Each of Seller and Column Financial, Inc. shall only be required to
pay its pro rata share of any such costs and expenses with regard to the
Mortgage Loan.

            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; provided, however, each of Seller and Column Financial, Inc. shall
only be required to pay its pro rata share of any such costs and expenses with
regard to the Mortgage Loan. In the event Seller elects to engage a third-party
contractor to prepare, complete, file and record Assignments with respect to the
Mortgage Loan 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 Barclays Capital Real
Estate Inc., 200 Park Avenue, New York, New York 10166, Attention: Kristen
Rodriguez, with a copy to Ian Sterling, Esq. and Julie Grossman, Esq. at
Barclays Capital Real Estate Inc., 200 Park Avenue, New York, New York 10166 and
Joseph B. Heil, Esq. at Dechert LLP, One Market, Steuart Tower, Suite 2500, San
Francisco, CA 94105, 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 the disclosure
required as to the Seller itself under Items 1117 and 1119 of Regulation AB and
Item 1.03 to Form 8-K. The Seller shall use commercially reasonable efforts to
deliver proposed disclosure language relating to any such 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 of become aware of such event
giving rise to such disclosure and in any event no later than two (2) business
days of the Seller becoming aware of such event. The obligation of the Seller to
provide the above referenced disclosure materials will terminate upon the filing
of the 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 File 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 File 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 Loan by Seller
to Depositor as provided in this Agreement be, and be construed as, a sale of
the Mortgage Loan by Seller to Depositor. It is, further, not the intention of
the parties that such conveyance be deemed a pledge of the Mortgage Loan 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 Loan is
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 Loan:

            (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 Loan, 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 Loan 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.

            Section 23. Recordation of Agreement. To the extent permitted by
applicable law, this Agreement is subject to recordation following the Closing
Date in all appropriate public offices for real property records in all the
counties or other comparable jurisdictions in which any or all of the properties
subject to the Mortgages are situated, and in any other appropriate public
recording office or elsewhere, such recordation to be effected by Seller at
Seller's expense at the direction of Depositor accompanied by an Opinion of
Counsel to the effect that such recordation materially and beneficially affects
the interests of Depositor.

                                      * * *

<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.

                                       BARCLAYS CAPITAL REAL ESTATE 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 Barclays Capital Real Estate 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.

            "Barclays Indemnification Agreement" means the agreement by and
among the Depositor, the Seller and each Underwriter.

            "Borrower" means the borrower under a Mortgage Loan.

            "Breach" shall have the meaning given such term in Section 7 of this
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 Statement" means the closing statement dated as of the
Closing Date and signed by, among others, the parties to this Agreement.

            "Code" means the Internal Revenue Code of 1986, as amended.

            "Crossed Mortgage Loan" means any Mortgage Loan which is
cross-defaulted and cross-collateralized with any other Mortgage Loan.

            "Cut-off Date" means, individually and collectively, the applicable
Due Date for the Mortgage Loan occurring in September 2006 (or with respect to a
Mortgage Loan which had a closing/funding date in September 2006, the
closing/funding date of such Mortgage Loan).

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

            "Environmental Report" means the environmental audit report with
respect to each Mortgaged Property delivered to Seller in connection with the
related Mortgage, if any.

            "Exception Report" means the exceptions with respect to the
representations and warranties made by Seller as to the Mortgage Loan in Section
6(a)(xii) and under the written certificate described in Section 4(b)(iii) of
this Agreement, which exceptions are set forth in Schedule V attached hereto and
made a part hereof.

            "Initial Purchaser" means Credit Suisse Securities (USA) LLC.

            "Initial Resolution Period" shall have the meaning given such term
in Section 7 of this Agreement.

            "Loan Agreement" means, with respect to any Mortgage Loan, the loan
agreement, if any, between the related Mortgage Loan Originator and the related
Borrower, pursuant to which such Mortgage Loan was made.

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

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

            "Mortgage File" means, collectively, the documents and instruments
pertaining to a Mortgage Loan required to be included in the related Mortgage
File pursuant to Section 3 of this Agreement (subject to the first proviso in
Section 1 of this Agreement).

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

            "Mortgage Loan" shall have the respective meanings given such terms
in Recital II of this Agreement.

            "Mortgage Loan Documents" means, collectively, the documents and
instruments pertaining to a Mortgage Loan to be included in either the related
Mortgage File or the related Servicer File.

            "Mortgage Loan Originator" means any institution which originated a
Mortgage Loan for a related Borrower.

            "Mortgage Loan Purchase Price" means the amount described in Section
2 of this Agreement.

            "Mortgage Loan Schedule" shall have the meaning given such term in
Recital II of this Agreement.

            "Offering Circular" means the confidential offering circular dated
September 21, 2006, describing certain classes of the Private Certificates.

            "Pooling and Servicing Agreement" means the Pooling and Servicing
Agreement creating the Trust Fund and the interests therein, dated as of
September 1, 2006, among Depositor, the Master Servicers, the Special Servicers
and the Trustee, including, without limitation, the exhibits and schedules
annexed thereto.

            "Primary Collateral" means with respect to any Crossed Mortgage
Loan, that portion of the Mortgaged Property designated as directly securing
such Crossed Mortgage Loan and excluding any Mortgaged Property as to which the
related lien may only be foreclosed upon by exercise of the
cross-collateralization provisions of such Crossed Mortgage Loan.

            "Private Certificates" means the Certificates that are not Publicly
Offered Certificates.

            "Prospectus" means the Prospectus dated September 8, 2006, that is a
part of Depositor's registration statement on Form S-3 (File No. 333-129918).

            "Prospectus Supplement" means the Prospectus Supplement, dated
September 21, 2006, relating to the Publicly Offered Certificates.

            "Publicly Offered Certificates" means the Class A-1, Class A-2,
Class A-AB, Class A-3, Class A-4FL, Class A-1-A, Class A-M and Class A-J
Certificates.

            "Servicer File" means, collectively, all documents, records and
copies pertaining to a Mortgage Loan which are required to be included in the
related Servicer File pursuant to Section 3.

            "Trust Fund" shall have the meaning given such term in Recital II of
this Agreement.

            "Trustee" shall have the meaning given such term in Section 1 of
this Agreement.

            "Underwriters" means Credit Suisse Securities (USA) LLC, LaSalle
Financial Services, Inc., KeyBanc Capital Markets, Barclays Capital Inc.,
Wachovia Capital Markets, LLC and Greenwich Capital Markets, Inc.

            "Underwriting Agreement" means the Underwriting Agreement, dated
September 21, 2006, between Depositor and the Underwriters.

                                                                     SCHEDULE II

                             MORTGAGE LOAN SCHEDULE

Loan Name                                  Ritz Carlton - South Beach
---------                                  --------------------------
Address                                    1 Lincoln Road
City                                       Miami Beach
County                                     Miami-Dade
State                                      FL
Zip Code                                   33139
Property Type                              Hotel
Units/Sq. ft./ Rooms/ Pads                 376
Original Balance                           $181,000,000
Cut-off Balance (1)                        $181,000,000
Orig. Amort. Term                          Interest Only
Rem Amort Term                             Interest Only
Interest Rate                              6.3725%
Net Interest Rate                          6.352%
Interest Calculation (30/360 Actual/360)   Actual/360)
Monthly Payment (3)                        $974,535
First Payment Date                         8/11/2006
Maturity Date                              7/11/2016
ARD (4)                                    N/A
Lockout/Defeasance                         Yes
Letter of Credit                           $0
Ground Lease                               Yes
Earthquake Insurance (Y/N)                 Yes
Environmental Insurance (Y/N)              N/A
Servicing and Trustee Fees                 0.020600%
Loan Seller                                Column Financial, Inc./ Barclays
                                           Capital

<PAGE>

                                                                    SCHEDULE III

                   MORTGAGE LOANS CONSTITUTING MORTGAGE GROUPS

                                      None
<PAGE>

                                                                     SCHEDULE IV

                         MORTGAGE LOANS WITH LOST NOTES

                                      None

<PAGE>

                                                                      SCHEDULE V

                             EXCEPTIONS TO SELLER'S
                         REPRESENTATIONS AND WARRANTIES

            Reference is made to the Representations and Warranties set forth in
Exhibit A attached hereto corresponding to the paragraph numbers set forth
below:

            Exception to representation (i)

                  Ritz-Carlton South Beach - Column Financial, Inc. and Barclays
Capital Real Estate Inc. were co-owners of the related Mortgage Loan immediately
prior to the sale, transfer and assignment to Depositor.

            Exception to representation (iv)

                  Ritz-Carlton South Beach - Pursuant to the loan agreement,
transfers are subject to the right retained by Column Financial, Inc. and
Barclays Capital Real Estate Inc. to appoint a successor borrower in the event
the borrower elects to defease the loan.

            Exception to representation (vii)

                  Ritz Carlton South Beach - Pursuant to the related loan
documents, all revenues from The Ritz-Carlton South Beach Property are collected
and then allocated by The Ritz-Carlton South Beach Property Manager on a monthly
basis as follows: (a) payment of ground rent, (b) payment of insurance premiums,
(c) payment of hotel operating expenses, base management fee, and funds
sufficient to maintain the requisite working capital, (d) payment of the FF&E,
(e) payment of debt service and taxes, (f) subject to the owner's priority,
payment of any incentive fees to The Ritz-Carlton South Beach Property Manager
and (g) payment of all excess amounts to the cash management account controlled
by the lender. After payment of all sums required to be paid under The
Ritz-Carlton South Beach Loan, all excess amounts, if any, are required to be
distributed to the borrower provided that no cash trap period is then in effect.

            Exception to representation (xxii)

                  Ritz-Carlton South Beach - There is a borrower controlled
escrow to be used for litigation related legal expenses and renovation of income
producing areas of the property. Certain escrows are held by the property
manager pursuant to the applicable loan documents and the property management
agreement.

            Exception to representation (xxiii)

Ritz Carlton South Beach - The applicable loan documents provide that so
long as the current manager or an applicable Marriott entity is managing the
property, the borrower may satisfy its insurance requirement under the loan
documents by causing the property manager to maintain a qualified insurance
program, which means a blanket insurance program maintained by Marriott or its
subsidiaries providing insurance coverage on the property required in the
management agreement in effect as of the date of the closing of the loan.

            The insurer providing the qualified insurance program is required to
have an "A" rating or better from S&P; provided, however, that if the insurer
fails to have at least an "A" rating, then such program shall be credit enhanced
within such blanket insurance program.

            The amount of "all-risk" insurance is not linked to the principal
amount of the loan; rather, (a) if the borrower is providing such insurance, the
applicable loan documents link the "all-risk" insurance to the replacement cost
and the co-insurance requirements, or (b) if insurance if being provided under a
qualified insurance program, the management agreement links the "all-risk"
insurance to the replacement cost.

            Exception to representation (xxxi)(I)

                  Ritz-Carlton South Beach - The ground lease is silent with
respect to subletting.

            Exception to representation (xxxi)(K)

                  Ritz-Carlton South Beach - The ground lease does not provide
for the related termination and modification option prohibitions in the last
sentence.

            Exception to representation (xxxviii)

                  Ritz-Carlton South Beach - The applicable loan documents
provide that the borrower has not and shall not incur any debt or financial
obligations except (a) such other liabilities that are disclosed in or are
permitted pursuant to the loan documents including (i) expenses incurred in
connection with the operation of the Property and paid under the Management
Agreement (ii) liabilities which in the aggregate do not exceed $1,000,000 or
(iii) liabilities that would not cause a material diminution in value of the
Property, and (b) loans by the limited partners of the borrower to the borrower
to the extent such loans are unsecured and payable only to extent of available
cash, have no remedies or rights against the borrower when the loan is
outstanding, are subordinate in all respects to the rights of the lender and are
not transferable except to a person that acquires the equity interest of such
limited partner.

            Exception to representation (xxxix)

                  Ritz-Carlton South Beach - Many of the licenses, permits,
consents and approvals are held by and are in the name of the related hotel
property manager.

            Exception to representation (xli)

                  Ritz-Carlton South Beach - A portion of the property is
located in flood zone AE, and the related insurance coverage is subject to the
exception above with regard to representation (xxiii).

            Exception to representation (liv)

            Ritz-Carlton South Beach - With respect to clause (A), the borrower
is liable for the misappropriation or conversion by the borrower of (a) any
insurance proceeds paid by reason of any casualty, (b) any awards received in
connection with a condemnation, (c) any rents following an event of default, (d)
any rents (other than advanced bookings received by the property manager
pursuant to the management agreement paid more than one month in advance) or (e)
funds in the segregated account defined in the loan documents. The borrower
shall not be liable for any event or action that is caused or taken by the
property manager provided that the borrower exercises its remedies under the
management agreement.

<PAGE>

                                  Schedule B-2

             List of Mortgage Loans with engineering reports and/or
                environmental assessments that are older than 18
                                     months.

                                      NONE
<PAGE>

                                                                       EXHIBIT A

                    REPRESENTATIONS AND WARRANTIES OF SELLER
                           REGARDING THE MORTGAGE LOAN

            For purposes of these representations and warranties, the phrase "to
the knowledge of Seller" or "to Seller's knowledge" shall mean, except where
otherwise expressly set forth below, the actual state of knowledge of Seller or
any servicer acting on its behalf regarding the matters referred to, in each
case without having conducted any independent inquiry or due diligence with
respect to such matters and without any actual or implied obligation to make
such inquiry or perform such due diligence, other than making such inquiry or
performing such due diligence as would be customarily performed by prudent
commercial or multifamily mortgage lenders or servicers (as the case may be)
with respect to similar mortgage loans or mortgaged properties. All information
contained in documents which are part of or required to be part of a Mortgage
File shall be deemed to be within the knowledge of Seller. Wherever there is a
reference to receipt by, or possession of, Seller of any information or
documents, or to any action taken by Seller or not taken by Seller, such
reference shall include the receipt or possession of such information or
documents by, or the taking of such action or the not taking of such action by,
either Seller or any servicer acting on its behalf.

            Seller hereby represents and warrants, subject to the exceptions set
forth in the Exception Report annexed to this Agreement as Schedule V, with
respect to the Mortgage Loan that as of the date hereinbelow specified or, if no
such date is specified, as of the date of this Agreement:

            (i) Immediately prior to the sale, transfer and assignment to
Depositor, no Note or Mortgage was subject to any assignment (other than
assignments which show a complete chain of assignment to Seller), participation
or pledge, and Seller had good and marketable title to, and was the sole owner
of, the related Mortgage Loan;

            (ii) Each Mortgage Loan was either:

            (A)   originated by a savings and loan association, savings bank,
                  commercial bank, credit union, or insurance company, which is
                  supervised and examined by a Federal or State authority, or by
                  a mortgagee approved by the Secretary of Housing and Urban
                  Development pursuant to Sections 203 and 211 of the National
                  Housing Act (any of the foregoing, including Seller, a
                  "Qualified Originator"); or

            (B)   if originated by a person which is not a Qualified Originator
                  (any such person, a "Non-Qualified Originator"), then:

                  1.    such Mortgage Loan was underwritten in accordance with
                        standards established by a Qualified Originator, using
                        application forms and related credit documents approved
                        by the Qualified Originator;

                  2.    the Qualified Originator approved each application and
                        related credit documents before a commitment by the
                        Non-Qualified Originator was issued, and no such
                        commitment was issued until the Qualified Originator
                        agreed to fund such Mortgage Loan;

                  3.    the Mortgage Loan was originated by the Non-Qualified
                        Originator pursuant to an ongoing, standing relationship
                        with the Qualified Originator; and

                  4.    the closing documents for the Mortgage Loan were
                        prepared on forms approved by the Qualified Originator,
                        and, pursuant to the Non-Qualified Originator's ongoing,
                        standing relationship with the Qualified Originator,
                        either:

                        (x)   such closing documents reflect the Qualified
                              Originator as the original mortgagee, and such
                              Mortgage Loan was actually funded by the Qualified
                              Originator at the closing thereof;

                        (y)   such closing documents reflect the Non-Qualified
                              Originator as the original mortgagee, but include
                              assignment documents executed by the Non-Qualified
                              Originator in favor of the Qualified Originator at
                              the time of the closing of the Mortgage Loan,
                              reflecting the Qualified Originator as the
                              successor and assign to the Non-Qualified
                              Originator, and the Mortgage Loan was funded
                              initially by the Non-Qualified Originator at the
                              closing thereof and then acquired by the Qualified
                              Originator from such Non-Qualified Originator; or

                        (z)   such closing documents reflect the Non-Qualified
                              Originator as the original mortgagee, but include
                              assignment documents executed by the Non-Qualified
                              Originator in favor of the Qualified Originator at
                              the time of the closing of the Mortgage Loan,
                              reflecting the Qualified Originator as the
                              successor and assign to the Non-Qualified
                              Originator, and the Mortgage Loan was funded
                              initially by the Qualified Originator at the
                              closing thereof and then acquired by the Qualified
                              Originator from such Non-Qualified Originator.

            (iii) Seller has full right and authority to sell, assign and
transfer such Mortgage Loan and the assignment to Depositor constitutes a legal,
valid and binding assignment of such Mortgage Loan;

            (iv) Seller is transferring such Mortgage Loan free and clear of any
and all liens, pledges, charges or any other interests or security interests of
any nature encumbering such Mortgage Loan, except for interests in servicing
rights created or granted under the Pooling and Servicing Agreement,
subservicing agreements and/or servicing rights purchase agreements being
executed and delivered in connection herewith;

            (v) To Seller's knowledge, based on the related borrower's
representations and covenants in the related mortgage loan documents and such
other due diligence as a reasonably prudent commercial mortgage lender would
deem appropriate, the borrower, lessee and/or operator was in possession of all
licenses, permits, and authorizations then required for use of the Mortgaged
Property which were valid and in full force and effect as of the origination
date and, to Seller's actual knowledge, such licenses, permits and
authorizations are still valid and in full force and effect;

            (vi) Each related Note, Mortgage, Assignment of Leases (if any) and
other agreement executed by or for the benefit of the related borrower, any
guarantor or their successors or assigns in connection with such Mortgage Loan
is the legal, valid and binding obligation of the related borrower, enforceable
in accordance with its terms, except as such enforcement may be limited by
bankruptcy, insolvency, reorganization, moratorium or other laws affecting the
enforcement of creditors' rights or by general principles of equity (regardless
of whether such enforceability is considered in a proceeding in equity or at
law); and there is no right of offset, rescission, abatement or diminution or
valid defense or counterclaim available to the related borrower with respect to
such Note, Mortgage, Assignment of Leases and other agreements, except as the
enforcement thereof may be limited by bankruptcy, insolvency, reorganization,
moratorium or other laws affecting the enforcement of creditors' rights or by
general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law);

            (vii) The Mortgage File contains an Assignment of Leases, either as
a separate instrument or incorporated into the related Mortgage. Each related
Assignment of Leases creates a valid first priority collateral assignment of, or
a valid first priority lien or security interest in, certain rights under the
related lease or leases, subject only to a license granted to the related
borrower to exercise certain rights and to perform certain obligations of the
lessor under such lease or leases, including the right to operate the related
leased property, except as the enforcement thereof may be limited by bankruptcy,
insolvency, reorganization, moratorium or other laws affecting the enforcement
of creditors' rights or by general principles of equity (regardless of whether
such enforceability is considered in a proceeding in equity or at law); no
person other than the related borrower owns any interest in any payments due
under such lease or leases that is superior to or of equal priority with the
lender's interest therein;

            (viii) Each related assignment of Mortgage from Seller to the
Trustee and related assignment of the Assignment of Leases, if the Assignment of
Leases is a separate document from the Mortgage, is in recordable form (but for
the insertion of the name and address of the assignee and any related recording
information, which is not yet available to Seller), and such assignments and any
assignment of any other agreement executed by or for the benefit of the related
borrower, any guarantor or their successors or assigns in connection with such
Mortgage Loan from Seller to the Trustee constitutes the legal, valid and
binding assignment from Seller to the Trustee, except as the enforcement thereof
may be limited by bankruptcy, insolvency, reorganization, liquidation,
receivership, moratorium or other laws relating to or affecting the enforcement
of creditors' rights or by general principles of equity (regardless of whether
such enforceability is considered in a proceeding in equity or at law);

            (ix) Since origination (A) except as set forth in the related
Mortgage File, such Mortgage Loan has not been modified, altered, satisfied,
canceled, subordinated or rescinded in whole or in part and (B) each related
Mortgaged Property has not been released, in whole or in part, from the lien of
the related Mortgage in any manner which materially interferes with the security
intended to be provided by such Mortgage; and since [_____], 2006, no waiver,
consent, modification, assumption, alteration, satisfaction, cancellation,
subordination or rescission which changes the terms of, or the security for, the
Mortgage Loan in any material respect has occurred or been given;

            (x) Each related Mortgage is a valid and enforceable first lien on
the related Mortgaged Property (subject to Permitted Encumbrances (as defined
below)), except as the enforcement thereof may be limited by bankruptcy,
insolvency, reorganization, moratorium or other laws affecting the enforcement
of creditors' rights or by general principles of equity (regardless of whether
such enforceability is considered in a proceeding in equity or at law), and
except that, in the case of the CBA Mortgage Loans the related Mortgage
encumbering the related Mortgaged Property also secures one or more other
mortgage loans; and such Mortgaged Property is free and clear of any mechanics'
and materialmen's liens which are prior to or equal with the lien of the related
Mortgage, except those which are insured against by a lender's title insurance
policy (as described below). A UCC Financing Statement has been filed and/or
recorded (or sent for filing or recording) in all places necessary to perfect a
valid security interest in the personal property necessary to operate the
Mortgaged Property as currently operated; and such security interest is a first
priority security interest, subject to any prior purchase money security
interest in such personal property, any personal property leases applicable to
such personal property and any other security interest in such personal property
which do not, individually or in the aggregate, materially interfere with the
security intended to be provided for such Mortgage Loan. Any security agreement,
chattel mortgage or equivalent document related to and delivered in connection
with the Mortgage Loan establishes and creates a valid and enforceable lien on
the property described therein, except as such enforcement may be limited by
bankruptcy, insolvency, reorganization, moratorium or other laws affecting the
enforcement of creditors' rights or by general principles of equity (regardless
of whether such enforceability is considered in a proceeding in equity or at
law). In the case of any Mortgage Loan secured by a hotel, the related loan
documents contain such provisions as are necessary and UCC Financing Statements
have been filed as necessary, in each case, to perfect a valid first priority
security interest in the related operating revenues with respect to such
Mortgaged Property. Notwithstanding the foregoing, no representation is made as
to the perfection of any security interest in rent, operating revenues or other
personal property to the extent that possession or control of such items or
actions other than the filing of UCC Financing Statements are required in order
to effect such perfection;

            (xi) Seller has not taken any action that would cause the
representations and warranties made by the related borrower in the related
Mortgage Loan Documents not to be true;

            (xii) Seller has no knowledge that the material representations and
warranties made by the related borrower in the related Mortgage Loan Documents
are not true in any material respect;

            (xiii) The lien of each related Mortgage is a first priority lien on
the fee or leasehold interest of the related borrower in the principal amount of
such Mortgage Loan or allocated loan amount of the portions of the Mortgaged
Property covered thereby (as set forth in the related Mortgage) after all
advances of principal and is insured by an ALTA lender's title insurance policy
(except that if such policy is yet to be issued, such insurance may be evidenced
by a "marked up" pro forma policy or title commitment in either case marked as
binding and countersigned by the title company or its authorized agent, either
on its face or by an acknowledged closing instruction or escrow letter), or its
equivalent as adopted in the applicable jurisdiction, insuring the named
mortgagee and its successors and assigns (as sole insured) as to such lien,
subject only to (A) the lien of current real property taxes, water charges,
sewer rents and assessments not yet delinquent or accruing interest or
penalties, (B) covenants, conditions and restrictions, rights of way, easements
and other matters of public record, none of which, individually or in the
aggregate, materially interferes with the current use of the Mortgaged Property
or the security intended to be provided by such Mortgage or with the borrower's
ability to pay its obligations when they become due or the value of the
Mortgaged Property, (C) the exceptions (general and specific) and exclusions set
forth in such policy, none of which, individually or in the aggregate,
materially interferes with the current general use of the Mortgaged Property or
materially interferes with the security intended to be provided by such Mortgage
or with the related borrower's ability to pay its obligations when they become
due or the value of the Mortgaged Property, (D) the rights of tenants, as
tenants only, under leases, including subleases, pertaining to the related
Mortgaged Property, (E) if the related Mortgage Loan is cross-collateralized
with any other Mortgage Loan, the lien of the mortgage instrument for that other
Mortgage Loan and (F) if the related Mortgaged Property is a unit in a
condominium, the related condominium declaration (items (A), (B), (C), (D), (E)
and (F) collectively, "Permitted Encumbrances"), and except that, in the case of
the CBA Mortgage Loans, the related Mortgage encumbering the related Mortgaged
Property also secures one or more other mortgage loans; and with respect to each
Mortgage Loan, such Permitted Encumbrances do not, individually or in the
aggregate, materially interfere with the security intended to be provided by the
related Mortgage, the current principal use of the related Mortgaged Property or
the current ability of the related Mortgaged Property to generate income
sufficient to service such Mortgage Loan; the premium for such policy was paid
in full; such policy (or if it is yet to be issued, the coverage to be afforded
thereby) is issued by a title insurance company licensed to issue policies in
the state in which the related Mortgaged Property is located (unless such state
is Iowa) and is assignable (with the related Mortgage Loan) to Depositor and the
Trustee without the consent of or any notification to the insurer, and is in
full force and effect upon the consummation of the transactions contemplated by
this Agreement; no claims have been made under such policy and Seller has not
undertaken any action or omitted to take any action, and has no knowledge of any
such act or omission, which would impair or diminish the coverage of such
policy;

            (xiv) The proceeds of such Mortgage Loan have been fully disbursed
and there is no requirement for future advances thereunder, and no future
advances have been made which are not reflected in the related Mortgage File;

            (xv) Except as set forth in a property inspection report or
engineering report prepared in connection with the origination of the Mortgage
Loan, as of the later of the date of origination of such Mortgage Loan or the
most recent inspection of the related Mortgaged Property by Seller, as
applicable, and to the knowledge of Seller as of the date hereof, each related
Mortgaged Property is free of any material damage that would affect materially
and adversely the use or value of such Mortgaged Property as security for the
Mortgage Loan (normal wear and tear excepted). If any of the inspection or
engineering reports referred to above in this paragraph (xv) revealed any
immediate repair items, then one of the following is true: (A) the repairs
and/or maintenance necessary to correct such condition have been completed in
all material respects; (B) an escrow of funds is required or a letter of credit
was obtained in an amount reasonably estimated to be sufficient to complete the
repairs and/or maintenance necessary to correct such condition; or (C) the
reasonable estimation at the time of origination of the Mortgage Loan of the
cost to complete the repairs and/or maintenance necessary to correct such
condition represented no more than the greater of (1) $50,000 and (2) 2% of the
value of the related Mortgaged Property as reflected in an appraisal conducted
in connection with the origination of the subject Mortgage Loan; as of the
closing date for each Mortgage Loan and, to Seller's knowledge, as of the date
hereof, there is no proceeding pending for the total or partial condemnation of
such Mortgaged Property that would have a material adverse effect on the use or
value of the Mortgaged Property;

            (xvi) Seller has inspected or caused to be inspected each related
Mortgaged Property within the past twelve months, or the originator of the
Mortgage Loan inspected or caused to be inspected each related Mortgaged
Property within three months of origination of the Mortgage Loan;

            (xvii) No Mortgage Loan has a shared appreciation feature, any other
contingent interest feature or a negative amortization feature other than the
ARD Loans which may have negative amortization from and after the related
Anticipated Repayment Date;

            (xviii) Each Mortgage Loan is a whole loan, and neither the Mortgage
Loan nor the related Mortgage Loan Documents create or grant an equity
participation to the lender or any other party;

            (xix) The Mortgage Rate (exclusive of any default interest, late
charges, or prepayment premiums) of such Mortgage Loan complied as of the date
of origination with, or was exempt from, applicable state or federal laws,
regulations and other requirements pertaining to usury. Except to the extent any
noncompliance did not materially and adversely affect the value of the related
Mortgaged Property, the security provided by the Mortgage or the related
borrower's operations at the related Mortgaged Property, any and all other
requirements of any federal, state or local laws, including, without limitation,
truth-in-lending, real estate settlement procedures, equal credit opportunity or
disclosure laws, applicable to such Mortgage Loan have been complied with as of
the date of origination of such Mortgage Loan;

            (xx) Neither Seller nor, to Seller's knowledge, any originator,
committed any fraudulent acts during the origination process of any Mortgage
Loan and (i) the origination of each Mortgage Loan is in all respects legal,
proper and prudent in accordance with customary commercial mortgage lending
standards and (ii) the servicing and collection of each Mortgage Loan is in all
respects legal, proper and prudent in accordance with servicing standard and no
other person has been granted or conveyed the right to service the Mortgage Loan
or receive any consideration in connection therewith, except as provided in the
Pooling and Servicing Agreement or any permitted subservicing agreements and/or
servicing rights purchase agreements being executed and delivered in connection
therewith;

            (xxi) All taxes and governmental assessments that became due and
owing prior to the date hereof with respect to each related Mortgaged Property
and that are or may become a lien of priority equal to or higher than the lien
of the related Mortgage have been paid or an escrow of funds has been
established and such escrow (including all escrow payments required to be made
prior to the delinquency of such taxes and assessments) is sufficient to cover
the payment of such taxes and assessments;

            (xxii) All escrow deposits and payments required pursuant to each
Mortgage Loan are in the possession, or under the control, of Seller or its
agent and there are no deficiencies (subject to any applicable grace or cure
periods) in connection therewith, all such escrows and deposits are being
conveyed by Seller to Depositor and identified as such with appropriate detail,
and any and all requirements for the disbursement of any such escrows have been
complied with in all material respects;

            (xxiii) Each related Mortgaged Property is insured by a fire and
extended perils insurance policy, issued by an insurer meeting the requirements
of the Pooling and Servicing Agreement, in an amount not less than the lesser of
the principal amount of the related Mortgage Loan and the replacement cost (with
no deduction for physical depreciation) and not less than the amount necessary
to avoid the operation of any co-insurance provisions with respect to the
related Mortgaged Property; each related Mortgaged Property is also covered by
business interruption or rental loss insurance which covers a period of not less
than 12 months and comprehensive general liability insurance in amounts
generally required by prudent commercial mortgage lenders for similar
properties; all Mortgaged Properties in California or in a seismic zone 4 or 5
have had a seismic assessment done and earthquake insurance was obtained to the
extent any such Mortgaged Property has a probable maximum loss in the event of
an earthquake of greater than twenty percent (20%) of the replacement value of
the related improvements; if the Mortgaged Property for any Mortgage Loan is
located within Florida or within 25 miles of the coast of North Carolina, South
Carolina, Georgia, Alabama, Mississippi, Louisiana or Texas, then, such
Mortgaged Property is insured by windstorm insurance in an amount at least equal
to the lesser of (i) the outstanding principal balance of such Mortgage Loan and
(ii) 100% of the insurable replacement cost of the improvements located on the
related Mortgaged Property; the Mortgaged Property securing the Mortgage Loan
having a Cut-off Date Principal Balance in excess of $3,000,000 has, as of the
date hereof, insurance policies in place with respect to acts of terrorism or
damage related thereto (excluding acts involving nuclear, biological or chemical
terrorism), unless such Mortgage Loan is listed on the applicable Exception
Report. All premiums on such insurance policies required to be paid as of the
date hereof have been paid; such insurance policies or the related insurance
certificates require prior notice to the insured of reduction in coverage,
termination or cancellation, and no such notice has been received by Seller;
such insurance names the lender under the Mortgage Loan and its successors and
assigns as a named or additional insured; each related Mortgage Loan obligates
the related borrower to maintain all such insurance and, at such borrower's
failure to do so, authorizes the lender to maintain such insurance at the
borrower's cost and expense and to seek reimbursement therefor from such
borrower;

            (xxiv) There is no monetary default, breach, violation or event of
acceleration existing under the related Mortgage Loan. To Seller's knowledge,
there is no (A) non-monetary default, breach, violation or event of acceleration
existing under the related Mortgage Loan or (B) event (other than payments due
but not yet delinquent) which, with the passage of time or with notice and the
expiration of any grace or cure period, would constitute a default, breach,
violation or event of acceleration, which default, breach, violation or event of
acceleration, in the case of either (A) or (B), would materially and adversely
affect the use or value of the Mortgage Loan or the related Mortgaged Property.
Notwithstanding the foregoing, this representation and warranty does not address
or otherwise cover any default, breach, violation or event of acceleration that
specifically pertains to any matter otherwise covered by any other
representation or warranty made by Seller elsewhere in this Exhibit A or the
Exception Report;

            (xxv) No Mortgage Loan has been more than 30 days delinquent in
making required payments since origination and as of the Cut-off Date no
Mortgage Loan is 30 or more days delinquent in making required payments;

            (xxvi) (A) Each related Mortgage contains provisions so as to render
the rights and remedies of the holder thereof adequate for the practical
realization against the Mortgaged Property of the principal benefits of the
security, including realization by judicial or, if applicable, non-judicial
foreclosure or, subject to applicable state law requirements, appointment of a
receiver, and (B) there is no exemption available to the borrower which would
interfere with such right to foreclose, except, in the case of either (A) or
(B), as the enforcement of the Mortgage may be limited by bankruptcy,
insolvency, reorganization, moratorium, redemption or other laws affecting the
enforcement of creditors' rights or by general principles of equity (regardless
of whether such enforceability is considered in a proceeding in equity or at
law). No borrower is a debtor in a state or federal bankruptcy or insolvency
proceeding;

            (xxvii) At origination, each borrower represented and warranted in
all material respects that to its knowledge, except as set forth in certain
environmental reports and, except as commonly used in the operation and
maintenance of properties of similar kind and nature to the Mortgaged Property,
in accordance with prudent management practices and applicable law, and in a
manner that does not result in any contamination of the Mortgaged Property, it
has not used, caused or permitted to exist and will not use, cause or permit to
exist on the related Mortgaged Property any hazardous materials in any manner
which violates federal, state or local laws, ordinances, regulations, orders,
directives or policies governing the use, storage, treatment, transportation,
manufacture, refinement, handling, production or disposal of hazardous materials
or other environmental laws; and the related borrower agreed to indemnify,
defend and hold the mortgagee and its successors and assigns harmless from and
against losses, liabilities, damages, injuries, penalties, fines, expenses, and
claims of any kind whatsoever (including attorneys' fees and costs) paid,
incurred or suffered by, or asserted against, any such party resulting from a
breach of the foregoing representations, warranties or covenants given by the
borrower in connection with such Mortgage Loan. A Phase I environmental report
(or, with respect to residential cooperative loans with an original principal
balance of $350,000 or less, a transaction screen meeting ASTM standards) and,
with respect to certain Mortgage Loans, a Phase II environmental report was
conducted by a reputable independent environmental consulting firm in connection
with such Mortgage Loan, which report (or transaction screen) did not indicate
any material non-compliance with applicable environmental laws or material
existence of hazardous materials or, if any material non-compliance or material
existence of hazardous materials was indicated in any such report (or
transaction screen), then at least one of the following statements is true: (A)
funds reasonably estimated to be sufficient to cover the cost to cure any
material non-compliance with applicable environmental laws or material existence
of hazardous materials have been escrowed by the related borrower and held by
the related mortgagee; (B) if the environmental report recommended an operations
and maintenance plan, but not any material expenditure of funds, an operations
and maintenance plan has been required to be obtained by the related borrower;
(C) the environmental condition identified in the related environmental report
was remediated or abated in all material respects prior to the date hereof; (D)
a no further action or closure letter was obtained from the applicable
governmental regulatory authority (or the environmental issue affecting the
related Mortgaged Property was otherwise listed by such governmental authority
as "closed"); (E) such conditions or circumstances identified in the Phase I
environmental report were investigated further and based upon such additional
investigation, an environmental consultant recommended no further investigation
or remediation; (F) a party unrelated to the borrower with financial resources
reasonably estimated to be adequate to cure the condition or circumstance
provided a guaranty or indemnity to the related borrower to cover the costs of
any required investigation, testing, monitoring or remediation; (G) the
expenditure of funds reasonably estimated to be necessary to effect such
remediation is not greater than two percent (2%) of the outstanding principal
balance of the related Mortgage Loan; or (H) a lender's environmental insurance
policy was obtained and is a part of the related Mortgage File. Notwithstanding
the preceding sentence, with respect to certain Mortgage Loans with an original
principal balance of less than $4,000,000, no environmental report may have been
obtained, but (in such cases where a Phase I environmental report was not
obtained) a lender's secured creditor impaired property environmental insurance
policy was obtained with respect to each such Mortgage Loan. Each of such
secured creditor impaired property environmental insurance policies is a part of
the related Mortgage File. Each of such environmental insurance policies is in
full force and effect, is in an amount not less than the 100% of the balance of
the related Mortgage Loan, and has a term extending not less than five years
after the maturity date of the related Mortgage Loan; the premiums for such
policies have been paid in full; the Trustee is named as an insured under each
of such policies; and Seller has delivered to the insurer all related
environmental reports in its possession. To Seller's knowledge, in reliance on
the environmental reports referred to in the second sentence of this paragraph
(xxvii) and except as set forth in such environmental reports, each Mortgaged
Property is in material compliance with all applicable federal, state and local
environmental laws, and to Seller's knowledge, no notice of violation of such
laws has been issued by any governmental agency or authority, except, in all
cases, as indicated in such environmental reports or other documents previously
provided to the Rating Agencies; and Seller has not taken any action which would
cause the Mortgaged Property to not be in compliance with all federal, state and
local environmental laws pertaining to environmental hazards;

            (xxviii) (1) Each Mortgage Loan contains provisions for the
acceleration of the payment of the unpaid principal balance of such Mortgage
Loan if, without the consent of the holder of the Mortgage (and the Mortgage
requires the mortgagor to pay all fees and expenses associated with obtaining
such consent), the related Mortgaged Property is directly or indirectly
transferred or sold, and (2) except with respect to transfers of certain
interests in the related borrower to persons already holding interests in the
borrower, their family members, affiliated companies and other estate planning
related transfers that satisfy certain criteria specified in the related
Mortgage (which criteria is consistent with the practices of prudent commercial
mortgage lenders) or any transfers in connection with the death or disability of
owners of the borrower or, if the related Mortgaged Property is a residential
cooperative property, transfers of stock of the related borrower in connection
with the assignment of a proprietary lease for a unit in the related Mortgaged
Property by a tenant-shareholder of the related borrower to other persons who by
virtue of such transfers become tenant-shareholders in the related borrower,
each Mortgage Loan also contains the provisions for the acceleration of the
payment of the unpaid principal balance of such Mortgage Loan if, without the
consent of the holder of the Mortgage (and the Mortgage requires the mortgagor
to pay all fees and expenses associated with obtaining such consent), a majority
interest in the related borrower is directly or indirectly transferred or sold;

            (xxix) All improvements included in the related appraisal are within
the boundaries of the related Mortgaged Property, except for encroachments onto
adjoining parcels for which Seller has obtained title insurance against losses
arising therefrom or that do not materially and adversely affect the use or
value of such Mortgaged Property. No improvements on adjoining parcels encroach
onto the related Mortgaged Property except for encroachments that do not
materially and adversely affect the value of such Mortgaged Property, the
security provided by the Mortgage, the current use of the Mortgaged Property, or
the related borrower's operations at the Mortgaged Property;

            (xxx) The information pertaining to the Mortgage Loan which is set
forth in the Mortgage Loan Schedule attached as an exhibit to this Agreement is
complete and accurate in all material respects as of the dates of the
information set forth therein (or, if not set forth therein, as of the Cut-off
Date);

            (xxxi) With respect to any Mortgage Loan where all or any portion of
the estate of the related borrower therein is a leasehold estate under a ground
lease, and the related Mortgage does not also encumber the related lessor's fee
interest in such Mortgaged Property, based upon the terms of the ground lease
and any estoppel received from the ground lessor, Seller represents and warrants
that:

            (A)   The ground lease or a memorandum regarding such ground lease
                  has been duly recorded. The ground lease permits the interest
                  of the lessee to be encumbered by the related Mortgage and
                  does not restrict the use of the related Mortgaged Property by
                  such lessee, its successors or assigns in a manner that would
                  adversely affect the security provided by the related
                  Mortgage. To Seller's knowledge, there has been no material
                  change in the terms of the ground lease since its recordation,
                  except by any written instruments which are included in the
                  related mortgage file;

            (B)   The lessor under such ground lease has agreed in a writing
                  included in the related mortgage file that the ground lease
                  may not be amended, modified, canceled or terminated without
                  the prior written consent of the lender and that any such
                  action without such consent is not binding on the lender, its
                  successors or assigns;

            (C)   The ground lease has an original term (or an original term
                  plus one or more optional renewal terms, which, under all
                  circumstances, may be exercised, and would be enforceable, by
                  the lender) that extends not less than 10 years beyond the
                  amortization term of the related Mortgage Loan;

            (D)   Based on the title insurance policy (or binding commitment
                  therefor) obtained by Seller, the ground lease is not subject
                  to any liens or encumbrances superior to, or of equal priority
                  with, the Mortgage, subject to Permitted Encumbrances and
                  liens that encumber the ground lessor's fee interest;

            (E)   Under the terms of the ground lease, the ground lease is
                  assignable to the lender and its assigns without the consent
                  of the lessor thereunder;

            (F)   The ground lease is in full force and effect, Seller has no
                  actual knowledge that any default beyond applicable notice and
                  grace periods has occurred, and to Seller's knowledge, there
                  is no existing condition which, but for the passage of time or
                  giving of notice, would result in a default under the terms of
                  the ground lease;

            (G)   The ground lease or ancillary agreement, which is part of the
                  Mortgage File, between the lessor and the lessee requires the
                  lessor to give notice of any default by the lessee to the
                  lender;

            (H)   The lender is permitted a reasonable opportunity (including,
                  where necessary, sufficient time to gain possession of the
                  interest of the lessee under the ground lease through legal
                  proceedings, or to take other action so long as the lender is
                  proceeding diligently) to cure any default under the ground
                  lease which is curable after the receipt of notice of any
                  default before the lessor may terminate the ground lease. All
                  rights of the lender under the ground lease and the related
                  Mortgage (insofar as it relates to the ground lease) may be
                  exercised by or on behalf of the lender;

            (I)   The ground lease does not impose any restrictions on
                  subletting that would be viewed as commercially unreasonable
                  by a prudent commercial mortgage lender. The lessor is not
                  permitted to disturb the possession, interest or quiet
                  enjoyment of any subtenant of the lessee in the relevant
                  portion of the Mortgaged Property subject to the ground lease
                  for any reason, or in any manner, which would adversely affect
                  the security provided by the related Mortgage;

            (J)   Under the terms of the ground lease and the related Mortgage,
                  any related insurance proceeds or condemnation award (other
                  than in respect of a total or substantially total loss or
                  taking) will be applied either to the repair or restoration of
                  all or part of the related Mortgaged Property, with the lender
                  or a trustee appointed by it having the right to hold and
                  disburse such proceeds as repair or restoration progresses
                  (except in such cases where a provision entitling another
                  party to hold and disburse such proceeds would not be viewed
                  as commercially unreasonable by a prudent commercial mortgage
                  lender), or to the payment of the outstanding principal
                  balance of the Mortgage Loan, together with any accrued
                  interest, except that in the case of condemnation awards, the
                  ground lessor may be entitled to a portion of such award;

            (K)   Under the terms of the ground lease and the related Mortgage,
                  any related insurance proceeds, or condemnation award in
                  respect of a total or substantially total loss or taking of
                  the related Mortgaged Property will be applied first to the
                  payment of the outstanding principal balance of the Mortgage
                  Loan, together with any accrued interest (except as provided
                  by applicable law or in cases where a different allocation
                  would not be viewed as commercially unreasonable by a prudent
                  commercial mortgage lender, taking into account the relative
                  duration of the ground lease and the related Mortgage and the
                  ratio of the market value of the related Mortgaged Property to
                  the outstanding principal balance of such Mortgage Loan).
                  Until the principal balance and accrued interest are paid in
                  full, neither the lessee nor the lessor under the ground lease
                  will have an option to terminate or modify the ground lease
                  without the prior written consent of the lender as a result of
                  any casualty or partial condemnation; and

            (L)   Provided that the lender cures any defaults which are
                  susceptible to being cured, the lessor has agreed to enter
                  into a new lease upon termination of the ground lease for any
                  reason, including rejection of the ground lease in a
                  bankruptcy proceeding;

            (xxxii) With respect to any Mortgage Loan where all or a material
portion of the estate of the related borrower therein is a leasehold estate, but
the related Mortgage also encumbers the related lessor's fee interest in such
Mortgaged Property: (A) such lien on the related fee interest is evidenced by
the related Mortgage, (B) such Mortgage does not by its terms provide that it
will be subordinated to the lien of any other mortgage or encumbrance upon such
fee interest, (C) upon the occurrence of a default under the terms of such
Mortgage by the related borrower, any right of the related lessor to receive
notice of, and to cure, such default granted to such lessor under any agreement
binding upon the lender would not be considered commercially unreasonable in any
material respect by prudent commercial mortgage lenders, (D) the related lessor
has agreed in a writing included in the related Mortgage File that the related
ground lease may not be amended or modified without the prior written consent of
the lender and that any such action without such consent is not binding on the
lender, its successors or assigns, and (E) the related ground lease is in full
force and effect, and Seller has no actual knowledge that any default beyond
applicable notice and grace periods has occurred or that there is any existing
condition which, but for the passage of time or giving of notice, would result
in a default under the terms of such ground lease;

            (xxxiii) Except in the case of the CBA Mortgage Loans with respect
to those Mortgage Loans that are cross-collateralized or cross-defaulted, all
other loans that are cross-collateralized or cross-defaulted with such Mortgage
Loans are being transferred to Depositor hereunder;

            (xxxiv) Neither Seller nor any affiliate thereof has any obligation
to make any capital contribution to any borrower under a Mortgage Loan, other
than contributions made on or prior to the date hereof;

            (xxxv) (A) The Mortgage Loan is directly secured by a Mortgage on a
commercial property or multifamily residential property, and (B) the fair market
value of such real property, as evidenced by an appraisal satisfying the
requirements of FIRREA conducted within 12 months of the origination of the
Mortgage Loan, was at least equal to 80% of the principal amount of the Mortgage
Loan (1) at origination (or if the Mortgage Loan has been modified in a manner
that constituted a deemed exchange under Section 1001 of the Code at a time when
the Mortgage Loan was not in default or default with respect thereto was not
reasonably foreseeable, the date of the last such modification) or (2) at the
date hereof; provided that the fair market value of the real property must first
be reduced by (x) the amount of any lien on the real property interest that is
senior to the Mortgage Loan and (y) a proportionate amount of any lien that is
in parity with the Mortgage Loan (unless such other lien secures a Mortgage Loan
that is cross-collateralized with such Mortgage Loan, in which event the
computation described in (B) shall be made on an aggregated basis);

            (xxxvi) There are no subordinate mortgages encumbering the related
Mortgaged Property, nor are there any preferred equity interests held by the
lender or any mezzanine debt related to such Mortgaged Property, except as set
forth in the Prospectus Supplement, in this Exhibit A or in the Exception
Report;

            (xxxvii) Except in cases where the related Mortgaged Property is a
residential cooperative property, the Mortgage Loan Documents executed in
connection with each Mortgage Loan having an original principal balance in
excess of $5,000,000 require that the related borrower be a Single-Purpose
Entity (for this purpose, "Single-Purpose Entity" shall mean an entity, other
than an individual, having organizational documents which provide substantially
to the effect that it is formed or organized solely for the purpose of owning
and operating one or more Mortgaged Properties, is prohibited from engaging in
any business unrelated to such property and the related Mortgage Loan, does not
have any assets other than those related to its interest in the related
Mortgaged Property or its financing, or any indebtedness other than as permitted
under the related Mortgage Loan). To Seller's actual knowledge, each borrower
has fully complied with the requirements of the related Note and Mortgage and
borrower's organizational documents regarding Single-Purpose Entity status;

            (xxxviii) Except in cases where the related Mortgaged Property is a
residential cooperative property, each Mortgage Loan prohibits the related
borrower from mortgaging or otherwise encumbering the Mortgaged Property, or any
controlling equity interest in the borrower, without the prior written consent
of the mortgagee or the satisfaction of debt service coverage or similar
criteria specified in the Note or Mortgage which would be acceptable to a
reasonably prudent commercial mortgage lender, and, except in connection with
trade debt and equipment financings in the ordinary course of borrower's
business, from carrying any additional indebtedness, except, in each case, liens
contested in accordance with the terms of the Mortgage Loans or, with respect to
each Mortgage Loan having an original principal balance of less than $4,000,000,
any unsecured debt;

            (xxxix) Each borrower covenants in the Mortgage Loan Documents that
it shall remain in material compliance with all material licenses, permits and
other legal requirements necessary and required to conduct its business;

            (xl) Each Mortgaged Property (A) is located on or adjacent to a
dedicated road, or has access to an irrevocable easement permitting ingress and
egress, (B) is served by public utilities and services generally available in
the surrounding community or otherwise appropriate for the use in which the
Mortgaged Property is currently being utilized, and (C) constitutes one or more
separate tax parcels or is covered by an endorsement with respect to the matters
described in (A), (B) or (C) under the related title insurance policy (or the
binding commitment therefor);

            (xli) Based solely on a flood zone certification or a survey of the
related Mortgaged Property, if any portion of the improvements on the Mortgaged
Property is located in an area identified by the Federal Emergency Management
Agency or the Secretary of Housing and Urban Development as having special flood
hazards categorized as Zone "A" or Zone "V" and flood insurance is available,
the terms of the Mortgage Loan require the borrower to maintain flood insurance,
or at such borrower's failure to do so, authorizes the lender to maintain such
insurance at the cost and expense of the borrower and such insurance is in full
force and effect in an amount not less than the lesser of (A) the replacement
cost of the material improvements on such Mortgaged Property, (B) the balance of
the Mortgage Loan and (C) the maximum amount of insurance available under the
applicable National Flood Insurance Administration Program;

            (xlii) With respect to each Mortgage which is a deed of trust, a
trustee, duly qualified under applicable law to serve as such, currently so
serves and is named in the deed of trust or has been substituted in accordance
with applicable law or may be substituted in accordance with applicable law by
the related mortgagee, and except in connection with a trustee's sale after a
default by the related borrower, no fees are payable to such trustee, and such
fees payable are payable by the borrower;

            (xliii) Except as disclosed in the Exception Report to this
Agreement, to the knowledge of Seller as of the date hereof, there was no
pending action, suit or proceeding, arbitration or governmental investigation
against any borrower or Mortgaged Property, an adverse outcome of which would
materially and adversely affect such borrower's ability to perform under the
related Mortgage Loan;

            (xliv) No advance of funds has been made by Seller to the related
borrower (other than mezzanine debt and the acquisition of preferred equity
interests by the preferred equity interest holder, as disclosed in the
Prospectus Supplement), and no funds have, to Seller's knowledge, been received
from any person other than, or on behalf of, the related borrower, for, or on
account of, payments due on the Mortgage Loan;

            (xlv) To the extent required under applicable law, as of the Cut-off
Date or as of the date that such entity held the Note, each holder of the Note
was authorized to transact and do business in the jurisdiction in which each
related Mortgaged Property is located, or the failure to be so authorized did
not materially and adversely affect the enforceability of such Mortgage Loan;

            (xlvi) All collateral for the Mortgage Loan is being transferred as
part of the Mortgage Loan;

            (xlvii) Except as disclosed in the Exception Report or the
Prospectus Supplement with respect to the Crossed Mortgage Loans and Mortgage
Loans secured by multiple, non-contiguous real properties, no Mortgage Loan
requires the lender to release any portion of the Mortgaged Property from the
lien of the related Mortgage except upon (A) payment in full or defeasance of
the related Mortgage Loan, (B) the satisfaction of certain legal and
underwriting requirements that would be customary for prudent commercial
mortgage lenders, which in all events include payment of a release price at
least 125% of the appraised value of the property to be released or of the
allocated loan amount of such property, (C) releases of unimproved out-parcels
or (D) releases of other portions of the Mortgaged Property which will not have
a material adverse effect on the use or value of the collateral for the related
Mortgage Loan and which were given no value in the appraisal of the Mortgaged
Property or of that portion of the Mortgaged Property used to calculate the
loan-to-value ratio of the Mortgaged Property for underwriting purposes. No
release or partial release of any Mortgaged Property, or any portion thereof,
expressly permitted or required pursuant to the terms of any Mortgage Loan would
constitute a significant modification of the related Mortgage Loan under Treas.
Reg. Section 1.860G-2(b)(2);

            (xlviii) Any insurance proceeds in respect of a casualty loss or
taking will be applied either to (A) the repair or restoration of all or part of
the related Mortgaged Property, with, in the case of all casualty losses or
takings in excess of a specified amount or percentage of the related loan amount
that a prudent commercial lender would deem satisfactory and acceptable, the
lender (or a trustee appointed by it) having the right to hold and disburse such
proceeds as the repair or restoration progresses (except in any case where a
provision entitling another party to hold and disburse such proceeds would not
be viewed as commercially unreasonable by a prudent commercial mortgage lender)
or (B) to the payment of the outstanding principal balance of such Mortgage Loan
together with any accrued interest thereon;

            (xlix) Each UCC Financing Statement, if any, filed with respect to
personal property constituting a part of the related Mortgaged Property and each
assignment, if any, of such UCC Financing Statement to Seller was, and each
assignment, if any, of such UCC Financing Statement in blank which the Trustee
or its designee is authorized to complete (but for the insertion of the name of
the assignee and any related filing information which is not yet available to
Seller) is, in suitable form for filing in the filing office in which such UCC
Financing Statement was filed;

            (l) To Seller's knowledge, (A) each commercial lease covering more
than 10% (20% in the case of any Mortgage Loan having an original principal
balance less than $2,500,000) of the net leaseable area of the related Mortgaged
Property is in full force and effect and (B) there exists no default under any
such commercial lease either by the lessee thereunder or by the related borrower
that could give rise to the termination of such lease;

            (li) Based upon an opinion of counsel and/or other due diligence
considered reasonable by prudent commercial mortgage lenders in the lending area
where the subject property is located, the improvements located on or forming
part of each Mortgaged Property comply with applicable zoning laws and
ordinances, or constitute a legal non-conforming use or structure or, if any
such improvement does not so comply, such non-compliance does not materially and
adversely affect the value of the related Mortgaged Property. With respect to
Mortgage Loans with a Cut-off Date Principal Balance of over $10,000,000, if the
related Mortgaged Property does not so comply, to the extent Seller is aware of
such non-compliance, it has required the related borrower to obtain law and
ordinance insurance coverage in amounts customarily required by prudent
commercial mortgage lenders;

            (lii) Each Mortgage Loan constitutes a "qualified mortgage" within
the meaning of Section 860G(a)(3) of the Code (but without regard to the rule in
Treasury Regulation (as defined herein) Section 1.860G-2(f)(2) that treats a
defective obligation as a qualified mortgage or any substantially similar
successor provision), the related Mortgaged Property, if acquired by a REMIC in
connection with the default or imminent default of such Mortgage Loan would
constitute "foreclosure property" within the meaning of Code Section 860G(a)(8)
and all Prepayment Premiums and Yield Maintenance Charges with respect to such
Mortgage Loan constitute "customary prepayment penalties" within the meaning of
Treasury Regulation Section 1.860G-1(b)(2);

            (liii) With respect to any Mortgage Loan that pursuant to the
Mortgage Loan Documents can be defeased, (A) the Mortgage Loan cannot be
defeased within two years after the Closing Date, (B) the borrower can pledge
only United States government securities in an amount sufficient to make all
scheduled payments under the Mortgage Loan when due, (C) the borrower is
required to provide independent certified public accountant's certification that
the collateral is sufficient to make such payments, (D) the loan may be required
to be assumed by a single-purpose entity designated by the holder of the
Mortgage Loan, (E) the borrower is required to provide an opinion of counsel
that the trustee has a perfected security interest in such collateral prior to
any other claim or interest, (F) the borrower is required to pay all Rating
Agency fees associated with defeasance (if rating confirmation is a specific
condition precedent thereto) and all other reasonable expenses associated with
defeasance, including, but not limited to, accountant's fees and opinions of
counsel, (G) with respect to any Significant Loan (as defined in the Pooling and
Servicing Agreement), the borrower is required to provide an opinion of counsel
that such defeasance will not cause any REMIC created under the Pooling and
Servicing Agreement to fail to qualify as a REMIC for federal or applicable
state tax purposes and (H) with respect to any Significant Loan (as defined in
the Pooling and Servicing Agreement), the borrower must obtain confirmation from
each Rating Agency that the defeasance would not result in such Rating Agency's
withdrawal, downgrade or qualification of the then current rating of any class
of Certificates rated by such Rating Agency;

            (liv) The Mortgage Loan Documents for each Mortgage Loan provide
that the related borrower thereunder shall be liable to the lender for any
losses incurred by the lender due to (A) the misapplication or misappropriation
of rents, insurance proceeds or condemnation awards, (B) any willful act of
material waste, (C) any breach of the environmental covenants contained in the
related Mortgage Loan Documents, and (D) fraud by the related borrower; provided
that, with respect to clause (C) of this sentence, an indemnification against
losses related to such violations or environmental insurance shall satisfy such
requirement; and provided, further, that, if the related Mortgaged Property is a
residential cooperative property, then the subject Mortgage Loan is fully
recourse to the borrower;

            (lv) If such Mortgage Loan is an ARD Loan, it commenced amortizing
on its initial scheduled Due Date and provides that: (A) its Mortgage Rate will
increase by no less than two percentage points in connection with the passage of
its Anticipated Repayment Date and so long as the Mortgage Loan is an asset of
the Trust Fund; (B) its Anticipated Repayment Date is not less than seven years
following the origination of such Mortgage Loan; (C) no later than the related
Anticipated Repayment Date, if it has not previously done so, the related
borrower is required to enter into a "lockbox agreement" whereby all revenue
from the related Mortgaged Property shall be deposited directly into a
designated account controlled by the applicable Master Servicer; and (D) any
cash flow from the related Mortgaged Property that is applied to amortize such
Mortgage Loan following its Anticipated Repayment Date shall, to the extent such
net cash flow is in excess of the Monthly Payment payable therefrom, be net of
budgeted and discretionary (servicer approved) capital expenditures;

            (lvi) Except as disclosed in the Prospectus Supplement, no Mortgage
Loan, and no group of Mortgage Loans made to the same borrower and to borrowers
that are Affiliates, accounted for more than 5.0% of the aggregate of the
Cut-off Date Principal Balances of all of the mortgage loans (including the
Mortgage Loans) sold to Depositor by Column Financial, Inc., LaSalle Bank
National Association, Barclays Capital Real Estate Inc., NCB, FSB and KeyBank
National Association pursuant to those certain Mortgage Loan Purchase
Agreements, each dated as of September 1, 2006, between Depositor and Column
Financial, Inc., LaSalle Bank National Association, Barclays Capital Real Estate
Inc., NCB, FSB and KeyBank National Association, respectively, as of the Cut-off
Date;

            (lvii) Except for the Mortgage Loans with an initial principal
balance less than $3,000,000, in connection with its origination or acquisition
of each Mortgage Loan, Seller obtained an appraisal of the related Mortgaged
Property, which appraisal is signed by an appraiser, who, to Seller's actual
knowledge, had no interest, direct or indirect, in the borrower, the Mortgaged
Property or in any loan made on the security of the Mortgaged Property, and
whose compensation was not affected by the approval or disapproval of the
Mortgage Loan; and

            (lviii) Each Mortgage Loan bears interest at a rate that remains
fixed throughout the remaining term of such Mortgage Loan, except in the case of
an ARD Loan after its Anticipated Repayment Date and except for the imposition
of a default rate.

<PAGE>

                                                                       EXHIBIT B

                             AFFIDAVIT OF LOST NOTE

STATE OF NEW YORK       )
                        )  ss.:
COUNTY OF NEW YORK      )

            ____________________________, being duly sworn, deposes and says:

            1. that he is an authorized signatory of Barclays Capital Real
Estate Inc. ("LaSalle");

            2. that _______________ is the owner and holder of a mortgage loan
in the original principal amount of $______________ secured by a mortgage (the
"Mortgage") on the premises known as ______________ ______________ located in
______________;

            3. that _______________, after having conducted a diligent
investigation of its records and files, has been unable to locate the following
original note and believes that said original note has been lost, misfiled,
misplaced or destroyed due to a clerical error:

            a     note in the original sum of $______________ made by
                  ______________, to _______________, under date of
                  ______________ (the "Note");

            4. that the Note is now owned and held by _______________;

            5. that the copy of the Note attached hereto is a true and correct
copy thereof;

            6. that the Note has not been paid off, satisfied, assigned,
transferred, encumbered, endorsed, pledged, hypothecated, or otherwise disposed
of and that the original Note has been either lost, misfiled, misplaced or
destroyed;

            7. that no other person, firm, corporation or other entity has any
right, title, interest or claim in the Note except _______________; and

            8. upon assignment of the Note by _______________ to Credit Suisse
First Boston Mortgage Securities Corp. (the "Depositor") and subsequent
assignment by Depositor to the trustee for the benefit of the holders of the
Credit Suisse First Boston Mortgage Securities Corp. Commercial Mortgage
Pass-Through Certificates, Series 2006-C4 (the "Trustee") (which assignment may,
at the discretion of Depositor, be made directly by _______________ to the
Trustee), _______________ covenants and agrees (a) promptly to deliver to the
Trustee the original Note if it is subsequently found, and (b) to indemnify and
hold harmless the Trustee and its successors and assigns from and against any
and all costs, expenses and monetary losses arising as a result of
_______________'s failure to deliver said original Note to the Trustee.

                                       BARCLAYS CAPITAL REAL ESTATE INC.

                                       By:____________________________________
                                          Name:
                                          Title:

Sworn to before me this _____
day of __________, 2006

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