Document:

EXHIBIT 4.3

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             CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
                                 (Depositor)

                                     and

                     GMAC COMMERCIAL MORTGAGE CORPORATION
                                   (Seller)

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                       MORTGAGE LOAN PURCHASE AGREEMENT

                          Dated as of March 1, 2005

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

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                              TABLE OF CONTENTS

Section 1.    Transactions on or Prior to the Closing Date..................
Section 2.    Closing Date Actions..........................................
Section 3.    Conveyance of Mortgage Loans..................................
Section 4.    Depositor's Conditions to Closing.............................
Section 5.    Seller's Conditions to Closing................................
Section 6.    Representations and Warranties of Seller......................
Section 7.    Obligations of Seller.........................................
Section 8.    Reserved......................................................
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...............................................
Section 14.   Notices.......................................................
Section 15.   Examination of Mortgage Files.................................
Section 16.   Successors....................................................
Section 17.   Governing Law.................................................
Section 18.   Severability..................................................
Section 19.   Further Assurances............................................
Section 20.   Counterparts..................................................
Section 21.   Treatment as Security Agreement...............................
Section 22.   Recordation of Agreement......................................

Schedule I   Schedule of Transaction Terms

Schedule II  Mortgage Loan Schedule for GMAC Loans

Schedule III Mortgage Loans with Lost Mortgage Notes

Schedule IV  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 March 1, 2005, is made by and between GMAC COMMERCIAL MORTGAGE CORPORATION, a
California 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, 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 Mortgage Loan to Wells Fargo Bank, N.A., as trustee (the "Trustee"),
against receipt by Seller of a trust receipt, pursuant to an arrangement between
Seller and the Trustee.

            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 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 (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, 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 consist of the
following documents:

            (a) each original Note (or with respect to those Mortgage Loans
listed in Schedule III 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 the Seller, and further endorsed by the Seller,
on its face or by allonge attached thereto, without recourse, 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
2005-C1, 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 the Seller, in each
case in the form submitted for recording or, if recorded, with evidence of
recording indicated thereon;

            (c) an original assignment of Mortgage, in recordable form (except
for any missing recording information and, if applicable, completion of the name
of the assignee), from the 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 2005-C1";

            (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 the 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 the 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 2005-C1";

            (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 the 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 the 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 2005-C1," 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) certified or other copies of all UCC Financing Statements and
continuation statements which show the filing or recording thereof or copies
thereof in the form submitted for filing or recording 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 that is described in the
related Mortgage or a separate security agreement, and original UCC Financing
Statement assignments in a form suitable for filing or recording, sufficient to
transfer such UCC Financing Statements 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 (as applicable) any Intercreditor
Agreement, mezzanine loan documents or preferred equity documents, together
with, if the Mortgage Loan is an A Loan, a copy of the Note for each related B
Loan;

            (n) with respect to any Cash Collateral Accounts and Lock-Box
Accounts, an original or copy of any related cash collateral control agreement
or lock-box control agreement, as applicable, and a copy of the UCC Financing
Statements, if any, submitted for filing with respect to the Seller's security
interest in the Cash Collateral Accounts and Lock-Box Accounts and all funds
contained therein (together with UCC Financing Statement assignments in a form
suitable for filing or recording, sufficient to transfer such UCC Financing
Statements to the Trustee on behalf of the Certificateholders);

            (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 Agreement (if separate from the related Mortgage
and Loan Agreement);

            (p) the originals of letters of credit, if any, relating to the
Mortgage Loan provided that in connection with deliveries of the Mortgage File
to the Trust, such originals shall be delivered to the Master Servicer and
copies thereof shall be delivered to the Trustee;

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

            (r) the original ground lease, if any, and any amendments,
modifications or extensions thereto, and any ground lease estoppel, or a copy of
any of the foregoing;

            (s) copies of franchise agreements and franchisor comfort letters,
if any, for hospitality properties;

            (t) with respect to the JFK Medical Pavilion II Loan, the original
or a copy of the REMIC declaration with respect to such loan, and copies of IRS
Form SS4 and Form 8811 filed with the IRS relating to that loan REMIC; and

            (u) if applicable (and not for purposes of the Seller's delivery
obligations), 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(i) of the Pooling and Servicing Agreement.

            Notwithstanding the foregoing, in the event that, in connection with
any Mortgage Loan, the 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), (l) 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 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 a duplicate original or
true copy of such document certified by the applicable public recording or
filing office, the applicable title insurance company or the 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 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, 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 the 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 the Seller's delivery
requirements under this Section 3 with respect to the subject document(s).

            Notwithstanding the foregoing, in the event that, in connection with
any Mortgage Loan, the 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
other than in accordance with the transfer contemplated by this Agreement), (l)
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 has been lost, the delivery
requirements of this Agreement shall be deemed to have been satisfied and such
non-delivered document shall be deemed to have been included in the related
Mortgage File if a photocopy of such non-delivered document (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 on or before the Closing Date.

            Notwithstanding the foregoing, in the event that the Seller cannot
deliver any UCC Financing Statement assignment with the filing 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
office where such UCC Financing Statement has been delivered for filing, the
Seller shall so notify the Trustee and shall not be in breach of its obligations
with respect to such delivery, provided that the Seller promptly forwards such
UCC Financing Statement to the Trustee upon its return, together with the
related original UCC Financing Statement assignment in a form appropriate for
filing.

            The Seller may, at its sole cost and expense, but is not obligated
to, engage a third party contractor to prepare or complete in proper form for
filing or recording any and all assignments of Mortgage, assignments of
Assignments of Leases and assignments of UCC Financing Statements to the Trustee
to be delivered pursuant to clauses (c), (e), (k) and (n) above (collectively,
the "Assignments"), to submit the 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 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.
In the event the Seller engages a third party contractor as contemplated in the
immediately preceding sentence, the rights, duties and obligations of the Seller
pursuant to this Agreement remain binding on such Seller; and, if the Seller
does not engage a third party as contemplated by the immediately preceding
sentence, then the 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, the Seller
shall deliver the Servicer Files with respect to each of the Mortgage Loans to
the 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 the Seller's possession relating
to such applicable Mortgage Loans (including reserve and escrow 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
privileged communications and documents prepared by the 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 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 (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.

            The 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 the Seller or any other name, to be transferred to the Master Servicer
(or a Sub-Servicer at the direction of the 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 Mortgage Note, the Mortgage 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 Master Servicer via wire transfer for deposit by the
Master Servicer into the Collection Account.

            Upon 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 the Depositor, as provided herein, as a sale of the Mortgage
Loans to the 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 the 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 the 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 the 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 in the Exception Report) shall be true and correct in all
material respects as of the Closing Date; and no event shall have occurred with
respect to the 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 the
Depositor's attorneys, shall have received in escrow, all of the following
closing documents, in such forms as are agreed upon and reasonably acceptable to
the Depositor and the Seller, duly executed by all signatories other than
Depositor, as required pursuant to the respective terms thereof:

            (i) the Mortgage Files, subject to the proviso to the first sentence
      of Section 1 of this Agreement, which shall have been delivered to and
      held by the Trustee on behalf of Seller;

            (ii) the Mortgage Loan Schedule;

            (iii) the certificate of the Seller confirming its representations
      and warranties set forth in Section 6 (subject to the exceptions 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 the 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 the Depositor in order for the 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 the
      Depositor as contemplated herein.

            (c) The 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) If requested, the Seller shall have delivered to the Trustee, on
or before the Closing Date, five 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 the 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. If requested by the Trustee or the Special
Servicer after the Closing Date, the Seller shall deliver to the Trustee or the
Special Servicer, as applicable, the powers of attorney described in the prior
sentence in form and substance reasonably acceptable to the requesting party.

            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 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:

                  (A) 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

                  (B) 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) The 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 California.
      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,
      investigation, 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 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
      organizational documents; (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 the Depositor to realize on the Mortgage Loans owned
      by Seller.

            (iv) Seller is solvent and the sale of 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 the
      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 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 the 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 in the Exception Report, are true and
      correct in all material respects as of the date hereof (or, in each case,
      as of such other date specifically set forth in the subject representation
      and warranty) with respect to the Mortgage Loans identified on Schedule
      II.

            (b) The 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 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 any restrictive or qualified
endorsement on any Note, assignment of Mortgage or reassignment of Assignment of
Leases but shall not inure to the benefit of any subsequent transferee
thereafter.

            If the Seller receives notice of a breach of any of the
representations or warranties contained in Exhibit A hereto and made by the
Seller with respect to any Mortgage Loan listed on Schedule II hereto, as of the
date hereof in Section 6(a)(xii) or as of the Closing Date pursuant to Section
4(b)(iii), 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 possession within the
time period required herein or (B) such document has not been properly executed
or is otherwise defective on its face (the circumstances in the foregoing
clauses (A) and (B), in each case, a "Defect" (including the "Defects" described
below) in the related Mortgage File), and if such Breach or Defect, as the case
may be, materially and adversely affects the value of the related Mortgage Loan
or the interests of the Certificateholders therein (any Breach or Defect that
materially and adversely affects the value of the related Mortgage Loan or the
interests of the Certificateholders therein, a "Material Breach" and a "Material
Defect", respectively), then the Seller shall, upon request of the Depositor,
the Trustee, the Master Servicer or the Special Servicer, not later than the
earlier of 90 days from the receipt by the Seller of such request or the
Seller's discovery of such Material Breach or Material Defect (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 Master Servicer for deposit into the 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) the Seller has commenced and is diligently
proceeding with the cure of such Material Breach or Material Defect within the
Initial Resolution Period and (iv) the Seller has delivered to the Rating
Agencies, the Master Servicer, the 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 the Seller shall have an additional 90 days to
cure such Material Defect or Material Breach. With respect to 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
related date of substitution shall be part of the Trust Fund; and (C) scheduled
payments of principal and interest due with respect to such Qualified Substitute
Mortgage Loan(s) on or prior to the related date of substitution shall not be
part of the Trust Fund, and the Seller shall be entitled to receive such
payments promptly following receipt by the Master Servicer or 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 "Defect" and to be conclusively presumed to materially and
adversely affect the interests of Certificateholders in and the value of a
Mortgage Loan: (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 and a certificate stating that the original
intervening assignments were sent for recordation; (e) the absence from the
Mortgage File of any required original letter of credit (unless such original
has been delivered to the 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.

            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 to materially and adversely affect the interest of
Certificateholders therein and the Initial Resolution Period for the affected
Mortgage Loan shall be 90 days following the earlier of (a) notice to Seller of
the discovery of such Defect or Breach by any party to the Pooling and Servicing
Agreement or (b) Seller's discovery of such Defect or Breach (which period shall
not be subject to extension).

            If the 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 Breach or Defect is not capable of being so corrected or cured within
such period, then the Seller shall purchase or substitute for the affected
Mortgage Loan as provided in this Section 7.

            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, the Seller will not
be obligated to repurchase or substitute for the entire Mortgage Loan if the
Mortgaged Loan may, pursuant to the terms of the related Mortgage Loan
Documents, be severed to allow for the repurchase of a portion of the Mortgage
Loan representing the affected Mortgaged Property and the Mortgage Loan
remaining after such severance satisfies the requirements, if any, set forth in
the Mortgage Loan Documents and (i) the 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) such 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 Master Servicer, the 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 the 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 the Depositor or the Trustee, as the case may be, and the
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), 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, 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 the 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 the Seller set
forth in this Section 7 to cure, substitute for or repurchase a Mortgage Loan
listed on Schedule II hereto constitute the sole remedies available to the
Depositor and its successors and assigns against Seller respecting any Breach or
Defect affecting such Mortgage Loan.

            Section 8. Reserved.

            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. 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.

            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 the consent of, notice to or any 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 9 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. Whether or not this Agreement is
terminated, both the Depositor and the Seller agree to pay the transaction
expenses incurred in connection with the transactions herein contemplated as set
forth in the Closing Statement.

            Section 13. Recording Costs. 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 shall be deemed to have been duly given if
personally delivered to or mailed, by registered mail, postage prepaid, by
overnight mail or courier service, or transmitted by facsimile and confirmed by
similar mailed writing, if to the Depositor, addressed to the Depositor at 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 the Depositor to the Seller in writing,
or, if to the Seller, addressed to the Seller at 200 Witmer Road, Horsham,
Pennsylvania 19044, Attention: David Cheung, Telecopy No.: [o], or such other
address or telecopy number as may be designated by the Seller to the Depositor
in writing.

            Section 15. 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 16. Successors. This Agreement shall inure to the benefit of
and shall be binding upon Seller and Depositor and their respective successors,
permitted assigns and legal representatives, 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 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
because of such ownership.

            Section 17. 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. TO THE FULLEST EXTENT PERMITTED UNDER
APPLICABLE LAW, THE SELLER AND THE DEPOSITOR EACH HEREBY IRREVOCABLY (I) SUBMITS
TO THE JURISDICTION OF ANY NEW YORK STATE AND FEDERAL COURTS SITTING IN NEW YORK
CITY WITH RESPECT TO MATTERS ARISING OUT OF OR RELATING TO THIS AGREEMENT; (II)
AGREES THAT ALL CLAIMS WITH RESPECT TO SUCH ACTION OR PROCEEDING MAY BE HEARD
AND DETERMINED IN SUCH NEW YORK STATE OR FEDERAL COURTS; (III) WAIVES, TO THE
FULLEST POSSIBLE EXTENT, THE DEFENSE OF AN INCONVENIENT FORUM; AND (IV) AGREES
THAT A FINAL JUDGMENT IN ANY SUCH ACTION OR PROCEEDING SHALL BE CONCLUSIVE AND
MAY BE ENFORCED IN OTHER JURISDICTIONS BY SUIT ON THE JUDGMENT OR IN ANY OTHER
MANNER PROVIDED BY LAW.

            Section 18. 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 19. 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 20. 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 21. 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 (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; and

            (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, financial 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.

            The Seller at the direction of the 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 execute and file such UCC Financing
Statements as may be necessary or appropriate to accomplish the foregoing.

            Section 22. 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 of the date first
above written.

                                       GMAC COMMERCIAL MORTGAGE
                                         CORPORATION,
                                         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 March 1, 2005, between GMAC Commercial Mortgage Corporation (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.

            "Borrower" means the borrower under a Mortgage Loan.

            "Certificate Purchase Agreement" means the Certificate Purchase
Agreement, dated March 3, 2005, between Depositor and the Initial Purchaser.

            "Certificates" means the Credit Suisse First Boston Mortgage
Securities Corp. Commercial Mortgage Pass-Through Certificates, Series 2005-C1,
issued in multiple classes.

            "Closing Date" means March 17, 2005.

            "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.

            "Cut-off Date" means, individually and collectively, the applicable
Due Dates for the respective Mortgage Loans occurring in March 2005.

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

            "Initial Purchaser" means Credit Suisse First Boston LLC.

            "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.

            "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 (subject to the proviso in Section 1 of the
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 the Agreement.

            "Offering Circular" means the confidential offering circular dated
March 3, 2005, 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 March
1, 2005, among the Master Servicer, the Special Servicer, the Depositor, the
Trustee and the Certificate Administrator, including, without limitation, the
exhibits and schedules annexed thereto.

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

            "Prospectus" means the Prospectus, dated March 3, 2005, that is a
part of the Depositor's registration statement on Form S-3 (File No.
333-121904).

            "Prospectus Supplement" means the Prospectus Supplement, dated March
3, 2005, 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-4, Class A-J, Class B, Class C and Class D
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 thereof.

            "Underwriters" means Credit Suisse First Boston LLC, GMAC Commercial
Holding Capital Markets Corp., Greenwich Capital Markets, Inc. and Banc of
America Securities LLC.

            "Underwriting Agreement" means the Underwriting Agreement, dated
March 3, 2005, between the Depositor and the Underwriters.

<PAGE>

                                                                     SCHEDULE II

                            MORTGAGE LOAN SCHEDULE

<TABLE>
<CAPTION>

 #     Crossed                    Property Name
------------------------------------------------------------------
<S>             <C>
  5             The Mansards
  6             Sheraton Premiere Tysons Corner
 11             Shoppes at Brinton Lake
 15             The Mall at Yuba City
 19             National and Hayden Complex
 20             Auburn Apartments
 24             Vintage Pointe Apartments
 26             Hampton Inn & Suites - Reagan National Airport
 27             Courtyard-Cypress
 32             The Regions Financial Tower
 33             New Haven Plaza
 37             Courtyard-Shadyside
 39             Meadows Manor Mobile Home Park
 43             Howard and Western Retail
 52             Hanford Town Center
 54             Jenkintown Plaza
 55             Residence Inn - Frederick
 63             Belvedere Park Plaza
 68             3400 Dundee Road
 73             Austin Heights
 77             Brown and Gilbert Plaza
 82             Hampton Inn - San Antonio
 86a            Stor-Rite Dr. Andre's Way
 86b            Stor-Rite 3750 East Industrial Way
 86c            Stor-Rite N.E. 4th Street
 94             JFK Medical Pavilion II
 96             Walgreens (Auburn)
 97             Pleasant Grove Self Storage Facility
 99a            Hobby Lobby Plaza
 99b            Kmart
 110            Grandview Plaza
 117            Parkway Villa Apartments
 118            Lancaster Court Apartments
 128            Skyline Office Plaza

<CAPTION>
  #                                         Address
------------------------------------------------------------------------
<S>    <C>
  5    1818 Mansard Boulevard
  6    8661 Leesburg Pike
  11   951 Baltimore Pike
  15   1215 Colusa Avenue
  19   3520-3542 Hayden Avenue and 8536 National Boulevard
  20   801 East Woodcroft Parkway
  24   5600 Carmichael Road
  26   2000 Jefferson Davis Highway
  27   5865 Katella Avenue
  32   1555 Palm Beach Lakes Boulevard
  33   267 Beach 14th Street
  37   5308 Liberty Avenue
  39   49 Blanca Lane
  43   7510-7572 North Western Avenue
  52   550 & 700 North Eleventh Avenue
  54   101 Greenwood Avenue
  55   5230 Westview Drive
  63   6870 North 9th Avenue
  68   3400 Dundee Road
  73   1533 Austin Highway
  77   1911-1933 East Brown Road & 1106 North Gilbert Road
  82   414 Bowie Street
 86a   1880 Dr. Andre's Way
 86b   3750 E. Industrial Way
 86c   330-358 N.E. 4th Street
  94   8200 Jog Road
  96   1701 Auburn Way South
  97   7101 Galilee Road
 99a   1950 Tiffin Avenue
 99b   140 Whalon Street
 110   5802-5858 West Camelback Road
 117   132-C 14th Avenue Northeast
 118   420 Hershey Avenue
 128   6262 North Swan Road

<CAPTION>
                                                                                Net
                                                                Mortgage     Mortgage
                                                                Rate at       Rate at         Original
  #                City                 State     Zip Code      Cut-Off       Cut-off         Balance
-------------------------------------------------------------------------------------------------------------
<S>   <C>                                <C>           <C>              <C>        <C>        <C>
  5   Griffith                            IN        46319            5.210%     5.1084%    $52,000,000
  6   Vienna                              VA        22182            5.220%     5.1899%    $51,500,000
 11   Concord Township                    PA        19342            5.480%     5.3784%    $45,500,000
 15   Yuba City                           CA        95991            5.570%     5.4684%    $36,000,000 (6)
 19   Culver City                         CA        90232            5.620%     5.5184%    $25,750,000 (7)
 20   Durham                              NC        27713            5.320%     5.2184%    $23,785,000
 24   Montgomery                          AL        36117            5.250%     5.1484%    $18,300,000 (8)
 26   Arlington                           VA        22202            6.350%     6.2890%    $17,000,000
 27   Cypress                             CA        90630            5.690%     5.6273%    $16,100,000
 32   West Palm Beach                     FL        33401            5.580%     5.4784%    $15,000,000
 33   Far Rockaway                        NY        11691            5.700%     5.6334%    $14,500,000
 37   Pittsburgh                          PA        15224            5.690%     5.6204%    $12,500,000
 39   Watsonville                         CA        95076            5.360%     5.2584%    $11,500,000
 43   Chicago                             IL        60645            5.310%     5.2084%    $10,000,000
 52   Hanford                             CA        93230            5.390%     5.2884%     $8,600,000
 54   Jenkintown                          PA        19046            5.820%     5.7384%     $8,320,000
 55   Frederick                           MD        21703            5.920%     5.8381%     $8,250,000
 63   Pensacola                           FL        32504            5.200%     5.0984%     $7,100,000
 68   Northbrook                          IL        60062            5.625%     5.5234%     $6,600,000
 73   San Antonio                         TX        78218            5.550%     5.4484%     $6,200,000
 77   Mesa                                AZ        85203            5.420%     5.3184%     $6,000,000
 82   San Antonio                         TX        78205            5.390%     5.2945%     $5,700,000
 86a  Delray Beach                        FL        33445            5.390%     5.2884%     $2,511,628
 86b  West Palm Beach                     FL        33404            5.390%     5.2884%     $1,460,710
 86c  Delray Beach                        FL        33483            5.390%     5.2884%     $1,427,662
 94   Boynton Beach                       FL        33437            6.020%     5.8934%     $4,575,000
 96   Auburn                              WA        98002            5.890%     5.7884%     $4,300,000
 97   Roseville                           CA        95678            5.570%     5.4684%     $4,300,000 (9)
 99a  Findlay                             OH        45840            5.650%     5.5484%     $2,800,000
 99b  Fitchburg and Leominster            MA        1420             5.650%     5.5484%     $1,400,000
 110  Glendale                            AZ        85301            5.440%     5.3134%     $3,250,000 (10)
 117  Center Point                        AL        35215            5.030%     4.9284%     $3,045,000
 118  Lancaster                           PA        17603            5.540%     5.4384%     $3,000,000
 128  Tucson                              AZ        85718            5.420%     5.3184%     $2,400,000

<CAPTION>
                            Remaining
                             Term to                                           Original             Remaining
            Cut-Off          Maturity        Maturity                        Amortization         Amortization
  #       Balance (1)        (1) (2)           Date           ARD (3)            Term               Term (1)
--------------------------------------------------------------------------------------------------------------------
<S>           <C>                     <C>      <C>         <C>                     <C>                   <C>
  5           $52,000,000             82       1/1/2012    N/A                     360                   360
  6           $51,332,283             61       4/1/2010    N/A                     300                   298
  11          $45,500,000            118       1/1/2015    N/A                     360                   360
  15          $36,000,000            115      10/1/2014    N/A                     360                   360
  19          $25,690,768            118       1/1/2015    N/A                     360                   358
  20          $23,785,000            118       1/1/2015    N/A                     360                   360
  24          $18,300,000            119       2/1/2015    N/A                     360                   360
  26          $16,885,692            115      10/1/2014    N/A                     300                   295
  27          $16,100,000            118       1/1/2015    N/A                     300                   300
  32          $15,000,000            119       2/1/2015    N/A                     300                   300
  33          $14,467,080            118       1/1/2015    N/A                     360                   358
  37          $12,443,022            117      12/1/2014    N/A                     300                   297
  39          $11,500,000             59       2/1/2010    N/A                     360                   360
  43           $9,975,799            118       1/1/2015    N/A                     360                   358
  52           $8,600,000            120       3/1/2015    N/A                     360                   360
  54           $8,320,000            114       9/1/2014    N/A                     360                   360
  55           $8,213,690            117      12/1/2014    N/A                     300                   297
  63           $7,100,000            120       3/1/2015    N/A                     300                   300
  68           $6,590,882            119       2/1/2015    N/A                     360                   359
  73           $6,200,000            118       1/1/2015    N/A                     360                   360
  77           $5,985,739            118       1/1/2015    N/A                     360                   358
  82           $5,672,797            117      12/1/2014    N/A                     300                   297
 86a           $2,511,628             58       1/1/2010    N/A           Interest Only          Interest Only
 86b           $1,460,710             58       1/1/2010    N/A           Interest Only          Interest Only
 86c           $1,427,662             58       1/1/2010    N/A           Interest Only          Interest Only
  94           $4,504,390            104      11/1/2013    N/A                     360                   344
  96           $4,300,000            240       3/1/2025    N/A                     240                   240
  97           $4,294,024            119       2/1/2015    N/A                     360                   359
 99a           $2,794,858            119       2/1/2015    N/A                     300                   299
 99b           $1,397,429            119       2/1/2015    N/A                     300                   299
 110           $3,250,000            120       3/1/2015    N/A                     360                   360
 117           $3,045,000            117      12/1/2014    N/A                     360                   360
 118           $2,993,008            118       1/1/2015    N/A                     360                   358
 128           $2,394,296            118       1/1/2015    N/A                     360                   358

<CAPTION>

                                                             Master
                Monthly                    Sq.              Servicing                        ARD Loan
  #           Payment (4)             Ft./Rooms/Pads        Fee Rate         Due Date          (3)
---------------------------------------------------------------------------------------------------------
<S>              <C>                               <C>           <C>                  <C>      <C>
  5              $285,859                          1,337         0.1000%              1        N/A
  6              $307,702                            437         0.0285%              1        N/A
  11             $257,773                        192,647         0.1000%              1        N/A
  15             $205,988 (11)                   305,887         0.1000%              1        N/A
  19             $148,150                        143,040         0.1000%              1        N/A
  20             $132,375                            328         0.1000%              1        N/A
  24             $101,053                            520         0.1000%              1        N/A
  26             $113,197                            161         0.0594%              1        N/A
  27             $100,703 (12)                       180         0.0611%              1        N/A
  32              $92,831                        174,603         0.1000%              1        N/A
  33              $84,158                            344         0.0650%              1        N/A
  37              $78,186                            132         0.0680%              1        N/A
  39              $64,289                            255         0.1000%              1        N/A
  43              $55,593                         88,404         0.1000%              1        N/A
  52              $48,238 (11)                   102,206         0.1000%              1        N/A
  54              $48,924 (12)                    98,839         0.0800%              1        N/A
  55              $52,752                             90         0.0803%              1        N/A
  63              $42,337                        125,690         0.1000%              1        N/A
  68              $37,993                         75,061         0.1000%              1        N/A
  73              $35,398                         59,692         0.1000%              1        N/A
  77              $33,767                         71,856         0.1000%              1        N/A
  82              $34,630                            169         0.0939%              1        N/A
 86a              $11,438                         58,384         0.1000%              1        N/A
 86b               $6,652                         30,784         0.1000%              1        N/A
 86c               $6,502                         31,874         0.1000%              1        N/A
  94              $27,488                         25,565         0.1250%              1        N/A
  96              $30,534                         14,560         0.1000%              1        N/A
  97              $24,604                        101,202         0.1000%              1        N/A
 99a              $17,446                         73,349         0.1000%              1        N/A
 99b               $8,723                        100,685         0.1000%              1        N/A
 110              $18,331                         86,799         0.1250%              1        N/A
 117              $16,402                            156         0.1000%              1        N/A
 118              $17,109                             88         0.1000%              1        N/A
 128              $13,507                         20,477         0.1000%              1        N/A

<CAPTION>

                                                                                        Letter
       Defeasance        Earthquake        Environmental                                  of
  #        (5)           Insurance           Insurance            Fee/Leasehold         Credit
------------------------------------------------------------------------------------------------------
<S>    <C>               <C>              <C>                   <C>                       <C>
  5    Yes               N/A              No                    Fee                       N/A
  6    Yes               N/A              No                    Fee                       N/A
  11   Yes               N/A              No                    Fee                       N/A
  15   Yes               N/A              No                    Fee                       (14)
  19   Yes               N/A              No                    Fee                       (15)
  20   Yes               N/A              No                    Fee                       N/A
  24   Yes               N/A              No                    Fee                       N/A
  26   Yes               N/A              No                    Fee                       N/A
  27   Yes               N/A              No                    Fee                       N/A
  32   Yes               N/A              Yes                   Fee                       N/A
  33   Yes               N/A              No                    Fee                       N/A
  37   Yes               N/A              No                    Fee/Leasehold             N/A
  39   Yes               N/A              No                    Fee                       N/A
  43   Yes               N/A              No                    Fee                       N/A
  52   Yes               N/A              No                    Fee                       N/A
  54   Yes               N/A              No                    Fee                       N/A
  55   Yes               N/A              No                    Fee                       N/A
  63   Yes               N/A              No                    Fee                       N/A
  68   Yes               N/A              No                    Fee                       N/A
  73   Yes               N/A              No                    Fee                       N/A
  77   Yes               N/A              No                    Fee                       N/A
  82   Yes               N/A              No                    Fee                       N/A
 86a   Yes               N/A              No                    Fee                       N/A
 86b   Yes               N/A              No                    Fee                       N/A
 86c   Yes               N/A              No                    Fee                       N/A
  94   Yes               N/A              No                    Fee                       N/A
  96   Yes               N/A              No                    Fee                       N/A
  97   Yes               N/A              No                    Fee                       N/A
 99a   Yes               N/A              No                    Fee                       N/A
 99b   Yes               N/A              No                    Fee                       N/A
 110   Yes               N/A              No                    Fee                       N/A
 117   Yes               N/A              No                    Fee                       N/A
 118   Yes               N/A              No                    Fee                       N/A
 128   Yes               N/A              No                    Fee                       N/A
</TABLE>

A     The Underlying Mortgage Loans secured by Bexley Creekside Apartments and
      Bexley Commons at Rosedale Apartments are cross-collateralized and
      cross-defaulted, respectively.

B     The Underlying Mortgage Loans secured by BP Sweetwater Ranch Apartments,
      BP Prescott Place II Apartments, BP Prescott Place I Apartments and BP
      Berkshire of Addison Apartments are cross-collateralized and
      cross-defaulted, respectively.

C     The Underlying Mortgage Loans secured by BP Huntington Lakes Apartments,
      BP Huntington Ridge Apartments and BP Berkshire Springs Apartments are
      cross-collateralized and cross-defaulted, respectively.

D     The Underlying Mortgage Loans secured by Highland - Highland Park Place
      and Highland - 13939 Livernois Avenue are cross-collateralized and
      cross-defaulted, respectively.

1     Assumes a Cut-off Date in March 2005.

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     Anticipated Repayment Date.

4     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 due after the initial interest only
      term.

5     "Yes" means that defeasance is permitted notwithstanding the Lockout
      Period.

6     The Mall at Yuba City mortgage loan is structured with a $6,000,000
      earnout amount. The Cut-Off Date LTV Ratio and U/W DSCR shown are net of
      the earnout. Balloon LTV is shown at full leverage.

7     The National and Hayden mortgage loan is structured with a $2,250,000
      earnout amount. The Cut-Off Date LTV Ratio and U/W DSCR shown are net of
      the earnout. Balloon LTV is shown at full leverage.

8     The Vintage Pointe Apartments mortgage loan is structured with a $600,000
      earnout amount. The Cut-Off Date LTV Ratio and U/W DSCR shown are net of
      the earnout. Balloon LTV is shown at full leverage.

9     The Pleasant Grove Self Storage Facility mortgage loan is structured with
      a $370,000 earnout amount. The Cut-Off Date LTV Ratio and U/W DSCR shown
      are net of the earnout. Balloon LTV is shown at full leverage.

10    The Grandview Plaza mortgage loan is structured with a $180,000 earnout
      amount. The Cut-Off Date LTV Ratio and U/W DSCR shown are net of the
      earnout. Balloon LTV is shown at full leverage.

11    Monthly payment during the Initial Interest Only Term shall be an amount
      equal to the product of the respective interest rate, the then outstanding
      balance and 1.0138889 divided by 12.

12    Monthly payment during the Initial Interest Only Term shall be an amount
      equal to the product of the respective interest rate and the then
      outstanding balance divided by 12.

14    At origination, borrower was required to establish various reserves which
      included a deposit of $1,500,000 into an immediate repair reserve and
      $1,500,000 into a tenant improvement and leasing commission reserve (such
      $3,000,000 of reserves, the "Cash Earnout Reserve"). The Cash Earnout
      Reserve is held by lender together with an irrevocable letter of credit in
      an initial amount of $3,000,000 as collateral to pay down the loan if
      certain financial criteria are not satisfied (collectively the earnout
      reserve). Although the Cash Earnout Reserve may be used by borrower for
      certain property related needs, prior to meeting such financial criteria,
      as a condition precedent to any disbursement from the Cash Earnout
      Reserve, borrower must cause the amount of the letter of credit to be
      increased by the amount of such disbursement. Prior to 8/22/2007,
      generally the amount of the letter of credit may be reduced (in whole or
      in part) if the property meets such financial criteria after giving effect
      to any such r

15    The borrower delivered an Irrevocable Standby Letter of Credit (LOC) in
      the amount of $675,000 which is a security deposit for the XAP lease. Any
      drawing of the LOC shall be deposited into the TI/LC Reserve. The lender
      shall release the balance of the LOC upon receipt of evidence that the XAP
      premises has been leased for a term of not less than 3 years at a market
      rental rate and the lender has received an estoppel certificate confirming
      that such tenant is occupying the premises and paying full rent. In the
      event that XAP elects to decrease the LOC in accordance with the Lease, a
      replacement LOC shall be delivered to the lender in accordance with the
      Loan Documents.

<PAGE>

                                                                    SCHEDULE III

                         MORTGAGE LOANS WITH LOST NOTES

                                      None

<PAGE>

                                                                     SCHEDULE IV

                             EXCEPTIONS TO SELLER'S
                         REPRESENTATIONS AND WARRANTIES

<PAGE>

                                                                       EXHIBIT A

                    REPRESENTATIONS AND WARRANTIES OF SELLER
                          REGARDING THE MORTGAGE LOANS

         Except as disclosed in the Exception Report to this Agreement:

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

            (ii) RESERVED.

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

            (iv) The Seller is transferring such Mortgage Loan free and clear of
any and all liens, pledges, charges or security interests of any nature
encumbering such Mortgage Loan;

            (v) As of origination, to Seller's knowledge, based on the related
Borrower's representations and covenants in the related Mortgage Loan Documents,
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;

            (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 such signatory, 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 valid offset, defense, counterclaim, or right of
rescission 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) 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 the Seller to the
Depositor and related assignment of the Assignment of Leases, if any, or
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 the Seller to the Depositor constitutes the legal, valid and
binding assignment from the Seller to the Depositor, 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 and (B) each related Mortgaged Property has
not been released from the lien of the related Mortgage in any manner which
materially interferes with the security intended to be provided by such
Mortgage;

            (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 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 owned by Borrower necessary to operate the
Mortgaged Property; 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 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);

            (xi) The 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) The 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 and/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 (or a binding commitment therefore or a marked-up pro forma policy), or
its equivalent as adopted in the applicable jurisdiction, insuring the Seller
and its successors and assigns as to such lien, subject only to (A) the lien of
current real property taxes, ground rents, 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 and
(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 (items (A), (B) and (C) collectively, "Permitted
Encumbrances"); 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 the 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 the Seller has not
undertaken any action or omitted to take any action, and has no knowledge of any
such act or omission, which would materially 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 the 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) or reserves have been established
to cover the costs to remediate such damage and, as of the closing date for each
Mortgage Loan and, to the 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) The 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 Anticipated
Repayment Date;

            (xviii) Each Mortgage Loan is a whole loan and contains no equity
participation by Seller;

            (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 the Seller nor to the Seller's knowledge, any
originator, committed any fraudulent acts during the origination process of any
Mortgage Loan, 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;

            (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 the Seller or its
agent and there are no deficiencies (subject to any applicable grace or cure
periods) in connection therewith and all such escrows and deposits are being
conveyed by the Seller to the Depositor and identified as such with appropriate
detail;

            (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 premiums on such insurance policies required to be paid as of
the date hereof have been paid; such insurance policies require prior notice to
the insured of termination or cancellation, and no such notice has been received
by the 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 (other than payments due but not
yet 30 days or more past due), breach, violation or event of acceleration
existing under the related Mortgage Loan; and, to the 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 and does 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) materially and adversely
affects the use or value of the Mortgage Loan or the related Mortgaged Property;
provided, however, that 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 the Seller in any of the other paragraphs of
this Exhibit A; and provided, further that a breach by the Borrower of any
representation or warranty contained in any Mortgage Loan Document shall not
constitute a non-monetary default, breach, violation or event of acceleration
for purposes of this representation and warranty if the subject matter of such
representation or warranty contained in any Mortgage Loan Document is also
covered by any other representation or warranty made by the Seller in this
Exhibit A;

            (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). To the
Seller's knowledge, 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; the related Borrower or an affiliate thereof 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 or
provided an environmental policy of insurance. A Phase I environmental report
and, with respect to certain Mortgage Loans, a Phase II environmental report,
was conducted by a reputable environmental consulting firm in connection with
such Mortgage Loan, which report 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, 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) an operations or 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 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 impairment environmental insurance policy
was obtained with respect to each such Mortgage Loan and is a part of the
related mortgage file. Each of such environmental insurance policies is in full
force and effect, the premiums for such policies have been paid in full and the
Trustee is named as an insured under each of such policies. To the Seller's
knowledge, in reliance on such environmental reports 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 the best
of the 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 the 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), each Mortgage Loan with a Stated Principal Balance of over
$20,000,000 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 the 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 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 a material
portion of the estate of the related Borrower therein is a leasehold estate, 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, the 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 the 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 will be enforceable, by the lender) that extends not less
      than 20 years beyond the stated maturity of the related Mortgage Loan;

            (D) Based on the title insurance policy (or binding commitment
      therefore or a marked-up pro forma policy) obtained by the 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) The ground lease is assignable to the lender and its assigns
      without the consent of the lessor thereunder;

            (F) As of the Closing Date, the ground lease is in full force and
      effect, and the 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 the ground lease;

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

            (H) A 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 an institutional
      investor. 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, 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 either to rebuilding the improvements or 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 any institutional investor, 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, except to provide for an
      abatement of the rent; 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 Seller 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 the 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) With respect to 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 the 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 (1) and (2) 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
Seller or any mezzanine debt related to such Mortgaged Property, except as set
forth in the Prospectus Supplement;

            (xxxvii) The Mortgage Loan Documents executed in connection with
each Mortgage Loan having an original principal balance in excess of $4,000,000
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 or covenants in the Mortgage Loan 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);

            (xxxviii) Each Mortgage Loan prohibits the related Borrower from
mortgaging or otherwise encumbering the Mortgaged Property without the prior
written consent of the mortgagee or the satisfaction of debt service coverage or
similar criteria specified therein 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 there is a filed application for separate tax parcel)
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 or a marked-up pro forma policy);

            (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;

            (xlii) To the knowledge of the Seller, 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;

            (xliii) RESERVED.

            (xliv) To the knowledge of the 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;

            (xlv) No advance of funds has been made by the 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 the 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;

            (xlvi) 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;

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

            (xlviii) Except as disclosed in the Prospectus Supplement with
respect to the Crossed Mortgage Loans and Mortgage Loans secured by multiple
Mortgaged 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, (C) releases of unimproved
out-parcels or (D) releases of 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;

            (xlix) Except as provided in paragraphs (xxxi)(J) and (K) above, 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 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;

            (l) Each Form UCC-1 financing statement, if any, filed with respect
to personal property constituting a part of the related Mortgaged Property and
each Form UCC-2 or UCC-3 assignment, if any, of such financing statement to the
Seller was, and each Form UCC-3 assignment, if any, of such 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 the Seller) is, in suitable form for filing in the
filing office in which such financing statement was filed;

            (li) To the 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;

            (lii) Based upon an opinion of counsel and/or other due diligence
considered reasonable by prudent commercial mortgage lenders, 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 any Mortgage Loan with a Stated Principal Balance as
of the Closing Date of over $10,000,000, if the related Mortgaged Property does
not so comply, to the extent the 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;

            (liii) 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 Section 1.860G-2(f)(2) that treats a defective obligation as
a qualified mortgage or any substantially similar successor provision) and all
Prepayment Premiums and Yield Maintenance Charges constitute "customary
prepayment penalties" within the meaning of Treasury Regulation Section
1.860G-1(b)(2);

            (liv) With respect to any Mortgage Loan that pursuant to the
Mortgage Loan Documents can be defeased, (A) the Mortgage Loan (other than
Mortgage Loans with respect to which a separate REMIC election has been made)
cannot be defeased within two years after the Closing Date, (B) the Borrower can
pledge only "government securities" (within the meaning of Section 2(a)(16) of
the Investment Company Act of 1940, as amended) or such other securities as
permitted by the Code with respect to REMIC collateral substitutions 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 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, (E) 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, (F)
with respect to any Significant Trust Mortgage 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 (G) with respect to any Significant Trust Mortgage Loan
(as defined in the Pooling and Servicing Agreement), the Borrower must obtain
Rating Agency 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 Certificate rated by such Rating Agency;

            (lv) The Mortgage Loan Documents for each Mortgage Loan provide that
the related Borrower thereunder shall be liable to the Seller for any losses
incurred by the Seller 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;

            (lvi) 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 more 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 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;

            (lvii) 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 Stated
Principal Balances of all of the Mortgage Loans; and

            (lviii) The Seller has delivered to the Trustee or a custodian
appointed thereby, with respect to each Mortgage Loan, in accordance with
Section 3 of this Agreement, a complete Mortgage File.

<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 GMAC Commercial Mortgage
Corporation ("GMACCM");

            2. that GMACCM 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. (a) that GMACCM , 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 GMAC Commercial Mortgage
            Corporation, under date of ______________ (the
            "Note");

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

            5. 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;

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

            7. upon assignment of the Note by GMACCM to Credit Suisse First
Boston Mortgage Securities Corp. (the "Depositor") and subsequent assignment by
the 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 2005-C1 (the "Trustee") (which assignment may, at the
discretion of the Depositor, be made directly by GMACCM to the Trustee) GMACCM
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 GMACCM's failure to deliver said original
Note to the Trustee.

                                       GMAC COMMERCIAL MORTGAGE
                                         CORPORATION

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

Sworn to before me
this ________ day of [     ], 2005Exhibit 4.3

                          FORM OF CONSULTING AGREEMENT

      THIS CONSULTING AGREEMENT is entered into between PowerHouse Technologies
Group, Inc., a California corporation (the "Company"), and [__________] (the
"Consultant"), effective this [___] day of [______], [___].

      WITNESSETH:

      WHEREAS, the Company desires to retain the services of the Consultant and
the Consultant desires to provide services to the Company upon the terms and
conditions provided herein.

      NOW, THEREFORE, in consideration of the premise and the covenants
hereinafter contained, the parties agree as follows:

      1. Consulting Services. The Consultant agrees to provide consulting
services to the Company during the term of this Agreement. The nature of the
services so to be provided shall be set forth on Schedule A.

      2. Extent of Services. The Consultant shall personally provide the
consulting services described herein. The Company understands that the nature of
the services to be provided are part time and that the Consultant will be
engaged in other business and consulting activities during the term of this
Agreement.

      3. Term. The term of this Agreement shall commence as of the date hereof
and shall continue through [________], unless sooner terminated as provided
herein.

      4. Consideration. In consideration of the execution of this Agreement, and
the performance of his obligations hereunder, the Consultant shall receive a fee
of $[________], payable in shares of common stock, $0.0001 par value per share,
of the Company (the "Shares"). The value of the Shares shall be determined as of
the date of issuance. The Shares shall be delivered to the Consultant on the
date the Consultant completes performance of the consulting services described
herein. The Shares shall be subject to a registration statement that is
effective under the Securities Act of 1933, as amended, generally providing for
their unrestricted transfer.

      5. Expenses. The Company shall pay or reimburse the Consultant for all
reasonable travel, business and miscellaneous expenses incurred by the
Consultant in performing its duties under this Agreement. Consultant shall not
incur any single expense in excess of $[________] without the prior written
consent of the Company.

      6. Confidential Information.

            (a) Confidentiality. Except as required in the performance of his
         duties to the Company, the Consultant shall treat as confidential and
         shall not, directly or indirectly, use, disseminate, disclose, publish
         or otherwise make available any Confidential Information (as hereafter
         defined) or any portion thereof. In furtherance of the foregoing, the
         Consultant shall be permitted to disclose Confidential Information to
         those of its employees, managers, members, agents, accountants,
         attorneys and consultants who

<PAGE>

         reasonably need to know such information in order for the Consultant to
         reasonably perform its duties hereunder

            (b) Return of Confidential Information. Upon termination of this
         Agreement, and upon the written request of the Company, all documents,
         records, notebooks, computer files, tapes and diskettes and similar
         repositories containing Confidential Information, including copies
         thereof, then in the Consultant's possession, whether prepared by him
         or others, shall be promptly destroyed by the Consultant or returned to
         the Company. If at any time after the termination of this Agreement,
         the Consultant determines that he has any Confidential Information in
         his possession or control, he shall immediately destroy or return the
         same to the Company, including all copies and portions thereof.

            (c) Definition. For purposes of this Agreement, "Confidential
         Information" means any and all information relating to the Company and
         labeled or marked "confidential" when disclosed or made available to
         the Consultant and which is or becomes known by Consultant as a direct
         or indirect consequence of or through his relationship with the Company
         and not generally known in the industry in which the Company is or may
         become engaged. Confidential Information shall not include any
         information which (i) was known by the Consultant prior to receipt of
         such information by him from the Company, (ii) is independently
         discovered by the Consultant after the date hereof, (iii) comes or has
         come within the public domain through no act or failure on the part of
         the Consultant or (iv) is rightfully obtained by the Consultant after
         the date hereof from a third party which, to the knowledge of the
         Consultant, is lawfully in possession of such Confidential Information.

      7. Remedies. The parties acknowledge that the remedies at law for the
breach of the agreements and covenants set forth in Section 6 hereof are
inadequate and that the Company shall be entitled to preliminary I and permanent
injunctive relief to the fullest extent available under applicable law enjoining
the Consultant from engaging in any conduct constituting a breach of the
agreements and covenants contained in Section 6 hereof. Such remedies shall be
in addition to, and not in substitution of, any other remedies which the Company
may have at law or in equity in the event of a breach of threatened breach of
any of the foregoing agreements or covenants by the Consultant.

      8. Status. Except as otherwise may be agreed in writing, the Consultant
shall at all times be an independent contractor, rather than a co-venturer,
agent, employee or representative of the Company.

      9. Notices. Any notice required or desired to be given under this
Agreement shall be in writing and shall be deemed given when personally
delivered or sent by certified or registered mail or overnight courier to the
following addresses, or such other address as to which one party may have
notified the other in such manner.

         If to the Company:    PowerHouse Technologies Group, Inc.
                               555 Twin Dolphin Drive, Suite 650
                               Redwood City, California 94065

         If to the Consultant: [____________]

<PAGE>

      10. Applicable Law. The validity, interpretation and performance of this
Agreement shall be controlled by and construed under the laws of the State of
California without regard to its conflict of law provisions.

      11. Severability. In the event of the invalidity or unenforceability of
any provision of this Agreement under applicable law, the parties hereto agree
that such invalidity or unenforceability shall in no way affect the validity or
enforceability of any other provisions of this Agreement.

      12. Waiver of Breach. The waiver by either party of a breach of any
provision of this agreement by the other shall not operate or be construed as a
waiver of any subsequent breach by such party. No waiver shall be valid unless
in writing and signed by each of the Company and the Consultant.

      13. Binding Effect. This Agreement shall be binding upon the parties and
their respective personal representatives, successors, and assigns.

      14. Entire Agreement. This Agreement contains the entire understanding of
the parties with respect to its subject matter. It may not be changed orally but
only by an agreement in writing signed by the party against whom enforcement of
any waiver, change, modification, extension, or discharge is sought.

      IN WITNESS WHEREOF, each of the parties has executed this Agreement on the
date first above written.

      PowerHouse Technologies Group, Inc.

By: /s/
   -----------------------------
   Name:
   Title:

By: /s/
   ----------------------------- \
   [________________], Consultant

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