Document:

Exhibit 4.5

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             CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
                                   (Depositor)

                                       and

                                    NCB, FSB
                                    (Seller)

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                        MORTGAGE LOAN PURCHASE AGREEMENT
                       ----------------------------------

                            Dated as of March 1, 2006

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

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                                TABLE OF CONTENTS

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

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

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

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                        MORTGAGE LOAN PURCHASE AGREEMENT

            This Mortgage Loan Purchase Agreement (this "Agreement"), dated as
of March 1, 2006, is made by and between NCB, FSB, a federal savings bank
chartered by the Office of Thrift Supervision of the U.S. Department of Treasury
("Seller"), and CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP., a Delaware
corporation ("Depositor").

                                    RECITALS

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

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

                                    AGREEMENT

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

            Section 1 Transactions on or Prior to the Closing Date. On or prior
to the Closing Date, Seller shall have delivered the Mortgage Files with respect
to each of the Mortgage Loans listed in the Mortgage Loan Schedule to Wells
Fargo Bank, N.A. as trustee (the "Trustee") or its designee, against receipt by
Seller of a written receipt, pursuant to an arrangement between Seller and the
Trustee; provided, however, that item (xvi) in the definition of Mortgage File
(below) shall be delivered to the applicable Master Servicer for inclusion in
the Servicer File (defined below) with a copy delivered to the Trustee for
inclusion in the Mortgage File; and provided, further, that Seller shall pay (or
cause the related Borrower to pay) any costs of the assignment or amendment of
each letter of credit described under said item (xvi) required in order for the
Trustee to draw on such letter of credit pursuant to the terms of the Pooling
and Servicing Agreement and shall deliver the related assignment or amendment
documents within thirty (30) days after the Closing Date. In addition, prior to
such assignment or amendment of a letter of credit, Seller will take all
necessary steps to enable the applicable Master Servicer to draw on the related
letter of credit on behalf of the Trustee pursuant to the terms of the Pooling
and Servicing Agreement, including, if necessary, drawing on the letter of
credit in its own name pursuant to written instructions to draw from the
applicable Master Servicer and upon receipt, immediately remitting the proceeds
of such draw (or causing such proceeds to be remitted) to the applicable Master
Servicer.

            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 payable in accordance with
            instructions previously provided to Depositor by Seller. The
            Mortgage Loan Purchase Price shall be paid by Depositor to Seller or
            at its direction by wire transfer in immediately available funds to
            an account designated by Seller on or prior to the Closing Date. The
            "Mortgage Loan Purchase Price" paid by Depositor shall be equal to
            the amount that the Depositor and the Seller have mutually agreed
            upon as the Seller's share of the net securitization proceeds from
            the sale of the Publicly Offered Certificates and the Private
            Certificates as set forth in the Closing Statement (which amount
            includes, without limitation, accrued interest). 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.

                  (ii) 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.

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

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

                  (i) the original Note (or with respect to those Mortgage Loans
            listed in Schedule IV hereto, a "lost note affidavit" substantially
            in the form of Exhibit B hereto and a true and complete copy of the
            Note), bearing, or accompanied by, all prior and intervening
            endorsements or assignments showing a complete chain of endorsement
            or assignment from the Mortgage Loan Originator either in blank or
            to Seller, and further endorsed (at the direction of Depositor given
            pursuant to this Agreement) by Seller, on its face or by allonge
            attached thereto, without recourse, either in blank or to the order
            of the Trustee in the following form: "Pay to the order of Wells
            Fargo Bank, N.A., as trustee for the registered Holders of Credit
            Suisse First Boston Mortgage Securities Corp., Commercial Mortgage
            Pass-Through Certificates, Series 2006-C1, without recourse,
            representation or warranty, express or implied";

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

                  (iii) an original assignment of the Mortgage, in recordable
            form (except for any missing recording information and, if
            applicable, completion of the name of the assignee), from Seller (or
            the Mortgage Loan Originator) either in blank or to "Wells Fargo
            Bank, N.A., as trustee for the registered Holders of Credit Suisse
            First Boston Mortgage Securities Corp., Commercial Mortgage
            Pass-Through Certificates, Series 2006-C1";

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

                  (v) an original assignment of any related Assignment of Leases
            (if such item is a document separate from the Mortgage), in
            recordable form (except for any missing recording information and,
            if applicable, completion of the name of the assignee), from Seller
            (or the Mortgage Loan Originator), either in blank or to "Wells
            Fargo Bank, N.A., as trustee for the registered Holders of Credit
            Suisse First Boston Mortgage Securities Corp., Commercial Mortgage
            Pass-Through Certificates, Series 2006-C1";

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

                  (vii) an original assignment of any related Security Agreement
            (if such item is a document separate from the Mortgage), from Seller
            (or the Mortgage Loan Originator) either in blank or to "Wells Fargo
            Bank, N.A., as trustee for the registered Holders of Credit Suisse
            First Boston Mortgage Securities Corp., Commercial Mortgage
            Pass-Through Certificates, Series 2006-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);

                  (viii) originals or copies of all (A) assumption agreements,
            (B) modifications, (C) written assurance agreements and (D)
            substitution agreements, together with any evidence, when
            appropriate, 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;

                  (ix) the original lender's title insurance policy or a copy
            thereof (together with all endorsements or riders that were issued
            with or subsequent to the issuance of such policy), or if the policy
            has not yet been issued, the original or a copy of a binding written
            commitment (which may be a pro forma or specimen title insurance
            policy which has been accepted or approved in writing by the related
            title insurance company or escrow instructions binding on the title
            insurer irrevocably obligating the title insurer to issue such title
            insurance policy) 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;

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

                  (xi) UCC acknowledgement, certified or other copies of all UCC
            Financing Statements and continuation statements which show the
            filing or recording thereof (including the filing number or other
            similar filing information) sufficient to perfect (and maintain the
            perfection of) the security interest held by the Mortgage Loan
            Originator (and each assignee of record prior to the Trustee) in and
            to the personalty of the Borrower at the Mortgaged Property, and
            original UCC Financing Statement assignments, in a form suitable for
            filing or recording, sufficient to assign each such UCC Financing
            Statement to the Trustee;

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

                  (xiii) an original or copy of any subordination agreement,
            standstill agreement or other intercreditor, co-lender or similar
            agreement relating to subordinate indebtedness, including any
            mezzanine loan documents or preferred equity documents;

                  (xiv) with respect to any Cash Collateral Accounts and
            Lock-Box Accounts, an original or copy of any related account
            control agreement and a copy of the UCC Financing Statements, if
            any, submitted for filing with respect to 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 security interest to the Trustee on behalf of the
            Certificateholders);

                  (xv) an original or copy of any related Loan Agreement (if
            separate from the related Mortgage);

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

                  (xvii) any related environmental insurance policy and any
            environmental guarantee or indemnity agreement or copies thereof;

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

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

                  (xx) 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(j) of the Pooling and Servicing Agreement.

            Notwithstanding the foregoing, in the event that, in connection with
any Mortgage Loan, Seller cannot deliver, or cause to be delivered, an original,
counterpart or certified copy, as applicable, of any of the documents and/or
instruments required to be delivered pursuant to clauses (ii), (iv), (viii),
(xi) (other than assignments of UCC Financing Statements to be recorded or filed
in accordance with the transfer contemplated by this Agreement), (xii) and (xiv)
(other than assignments of UCC Financing Statements to be filed in accordance
with the transfer contemplated by the related Mortgage Loan Purchase Agreement)
of the last sentence of the first paragraph of this Section 3, 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, Seller: (i) shall
deliver, or cause to be delivered, to the Trustee or its designee a duplicate
original or true copy of such document or instrument certified by the applicable
public recording or filing office, the applicable title insurance company or
Seller to be a true and complete duplicate original or copy of the original
thereof submitted for recording or filing; and (ii) shall deliver, or cause to
be delivered, to the Trustee or its designee either the original of such
non-delivered document or instrument, or a photocopy thereof (certified by the
appropriate public recording or filing office to be a true and complete copy of
the original thereof submitted for recording or filing), with evidence of
recording or filing thereon (with a copy to the applicable Master Servicer),
within 365 days after the Closing Date, which period may be extended up to two
times, in each case for an additional period of 90 days (provided that Seller,
as certified in writing to the Trustee prior to each such 90-day extension, is
in good faith attempting to obtain from the appropriate recording or filing
office such original or photocopy). Compliance with this paragraph will satisfy
Seller's delivery requirements under this Section 3 with respect to the subject
document(s) and instrument(s).

            Notwithstanding the foregoing, in the event that, in connection with
any Mortgage Loan, Seller cannot deliver, or cause to be delivered, an original,
counterpart or certified copy, as applicable, of any of the documents and/or
instruments required to be delivered pursuant to clauses (ii), (iv), (viii),
(xi) (other than assignments of UCC Financing Statements to be recorded or filed
in accordance with the transfer contemplated by this Agreement), (xii) and (xiv)
(other than assignments of UCC Financing Statements to be filed in accordance
with the transfer contemplated by the related Mortgage Loan Purchase Agreement)
of the last sentence of the first paragraph of this Section 3, with evidence of
recording or filing thereon for any other reason, including without limitation,
that such non-delivered document or instrument has been lost, the delivery
requirements of this Agreement shall be deemed to have been satisfied and such
non-delivered document or instrument shall be deemed to have been included in
the related Mortgage File if a photocopy of such non-delivered document or
instrument (with evidence of recording or filing thereon and certified by the
appropriate recording or filing office to be a true and complete copy of the
original thereof as filed or recorded) is delivered to the Trustee (with a copy
to the applicable Master Servicer) or its designee on or before the Closing
Date.

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

            Notwithstanding the foregoing, Seller may, at its sole cost and
expense, but is not obligated to, engage a third-party contractor to prepare or
complete in proper form for filing or recording any and all assignments of
Mortgage, assignments of Assignments of Leases and assignments of UCC Financing
Statements to the Trustee to be delivered pursuant to clauses (iii), (v) and
(xi) of the last sentence of the first paragraph of this Section 3
(collectively, the "Assignments"), to submit those Assignments for filing and
recording, as the case may be, in the applicable public filing and recording
offices and to deliver those Assignments to the Trustee or its designee as those
Assignments (or certified copies thereof) are received from the applicable
filing and recording offices with evidence of such filing or recording indicated
thereon. However, in the event Seller engages a third-party contractor as
contemplated in the immediately preceding sentence, the rights, duties and
obligations of Seller pursuant to this Agreement remain binding on the Seller;
and, if Seller does not engage a third party as contemplated by the immediately
preceding sentence, then Seller will still be liable for recording and filing
fees and expenses of the Assignments as and to the extent contemplated by
Section 13 hereof.

            Within ten (10) Business Days after the Closing Date, Seller shall
deliver the Servicer Files with respect to each of the Mortgage Loans to the
applicable Master Servicer (or, if applicable, to a Sub-Servicer (with a copy to
the applicable Master Servicer) at the direction of the applicable Master
Servicer), under the Pooling and Servicing Agreement on behalf of the Trustee in
trust for the benefit of the Certificateholders. Each such Servicer File shall
contain all documents and records in Seller's possession relating to such
applicable Mortgage Loans (including reserve and escrow agreements, rent rolls,
leases, environmental and engineering reports, third-party underwriting reports,
appraisals, surveys, legal opinions, estoppels, financial statements, operating
statements and any other information provided by the respective Borrower from
time to time, but excluding any draft documents, attorney/client communications,
which are privileged or constitute legal or other due diligence analyses, and
documents prepared by 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.

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

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

            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 due after the Cut-off Date, minus
that portion of any such payment which is allocable to the period on or prior to
the Cut-off Date. All scheduled payments of principal due on or before the
Cut-off Date and collected after the Cut-off Date, together with the
accompanying interest payments, shall belong to Seller.

            Upon the sale of the Mortgage Loans from Seller to Depositor
pursuant hereto, the ownership of each Note, the related Mortgage 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 documents prepared by Seller
or any of its Affiliates solely for internal credit analysis or other internal
uses or any attorney-client privileged communication, shall immediately vest in
Depositor. All Monthly Payments, Principal Prepayments and other amounts
received by Seller and not otherwise belonging to Seller pursuant to this
Agreement shall be sent by Seller within three (3) Business Days after Seller's
receipt thereof to the applicable Master Servicer via wire transfer for deposit
by the applicable Master Servicer into the Collection Account.

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

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

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

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

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

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

                  (ii) the Mortgage Loan Schedule;

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

                  (iv) an opinion or opinions of Seller's counsel, dated the
            Closing Date, covering various corporate matters and such other
            matters as shall be reasonably required by Depositor; provided that
            (A) such opinion may express its reliance as to factual matters on,
            among other things specified in such opinion, the representations
            and warranties made herein, and on certificates or other documents
            furnished by officers of Seller and (B) in rendering the opinions
            expressed above, such counsel may limit such opinions to matters
            governed by the laws of the State of New York and the laws of the
            United States and shall not be required to express any opinion with
            respect to the registration or qualification of the Certificates
            under any applicable state or federal securities laws;

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

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

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

            (d) Seller shall have delivered to the Trustee, on or before the
Closing Date, five (5) limited powers of attorney in favor of the Trustee and
applicable Special Servicer empowering the Trustee and, in the event of the
failure or incapacity of the Trustee, the applicable Special Servicer, to
record, at the expense of Seller, any Mortgage Loan Documents required to be
recorded and any intervening assignments with evidence of recording thereon that
are required to be included in the Mortgage Files. Seller shall reasonably
cooperate with the Trustee and the applicable Special Servicer in connection
with any additional powers or revisions thereto that are requested by such
parties.

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

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

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

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

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

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

            Section 6. Representations and Warranties of Seller.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

            Any of the following will cause a document in the Mortgage File to
be deemed to have a "Material Defect": (a) the absence from the Mortgage File of
the original signed Note, unless the Mortgage File contains a signed lost note
affidavit and indemnity; (b) the absence from the Mortgage File of the original
signed Mortgage, unless there is included in the Mortgage File a certified copy
of the Mortgage as recorded or as sent for recordation, together with a
certificate stating that the original signed Mortgage was sent for recordation,
or a copy of the Mortgage and the related recording information; (c) the absence
from the Mortgage File of the item called for by clause (ix) of the last
sentence of the first paragraph of Section 3 hereof; (d) the absence from the
Mortgage File of any intervening assignments required to create an effective
assignment to the Trustee on behalf of the Trust, unless there is included in
the Mortgage File a certified copy of the intervening assignment as recorded or
as sent for recordation, together with a certificate stating that the original
intervening assignment was sent for recordation, or a copy of the intervening
assignment and the related recording information; or (e) the absence from the
Servicer File of any required original letter of credit, 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. In addition, Seller shall cure
any Defect described in clause (b), (c), (e) or (f) of the immediately preceding
sentence as required in Section 2.02(b) of the Pooling and Servicing Agreement.
Notwithstanding anything herein to the contrary, the failure to include a
document checklist in a Mortgage File shall in no event constitute a Material
Defect.

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

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

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

            The Purchase Price or Substitution Shortfall Amount for any
repurchased or substituted Mortgage Loan shall be payable to Depositor or,
subsequent to the assignment of the Mortgage Loans to the Trustee, the Trustee
as its assignee, by wire transfer of immediately available funds to the account
designated by Depositor or the Trustee, as the case may be, and Depositor or the
Trustee, as the case may be, upon receipt of such funds (and, in the case of a
substitution, receipt of the Mortgage File(s) for the related Qualified
Substitute Mortgage Loans(s)), shall promptly release the related Mortgage File
and Servicer File or cause them to be released, to Seller and shall execute and
deliver such instruments of transfer or assignment as shall be necessary to vest
in Seller the legal and beneficial ownership of such Mortgage Loan (including
any property acquired in respect thereof or proceeds of any insurance policy
with respect thereto) and the related Mortgage Loan Documents.

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

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

            Section 9. Rating Agency Fees; Costs and Expenses Associated with a
Defeasance. 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
Seller of the parenthetical in representation (xxviii)(1) set forth on Exhibit A
hereto. Unless the Seller elects to repurchase or substitute for such Mortgage
Loan in accordance with the second paragraph of Section 7 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 Seller of
representation (liii)(F) set forth on Exhibit A hereto unless the Seller elects
to repurchase or substitute for such Mortgage Loan in accordance with the second
paragraph of Section 7.

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

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

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

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

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

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

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

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

            Section 14. Notices. All demands, notices and communications
hereunder shall be in writing and effective only upon receipt, and, (a) if sent
to Depositor, will be mailed, delivered or telecopied and confirmed to it at
Credit Suisse First Boston Mortgage Securities Corp., 11 Madison Avenue, 5th
Floor, New York, New York 10010, Attention: Edmund Taylor, Telecopy No.: (212)
743-4756 (with a copy to Casey McCutcheon, Esq., Legal & Compliance Department,
Telecopy No.: (917) 326-8433), or such other address or telecopy number as may
be designated by Depositor to Seller in writing, or (b) if sent to Seller, will
be mailed, delivered or telecopied and confirmed to it at 1725 Eye Street, N.W.,
Washington, D.C. 20006, Attention: Kathleen Luzik, Telecopy No.: (202) 336-7800,
or such other address or telecopy number as may be designated by Seller to
Depositor in writing.

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

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

            Section 17. Successors. This Agreement shall inure to the benefit of
and shall be binding upon Seller and Depositor and their respective successors
and permitted assigns, and nothing expressed in this Agreement is intended or
shall be construed to give any other Person any legal or equitable right, remedy
or claim under or in respect of this Agreement, or any provisions herein
contained, this Agreement and all conditions and provisions hereof being
intended to be and being for the sole and exclusive benefit of such designated
Persons and for the benefit of no other Person; it being understood that (a) the
indemnities of Seller contained in that certain Indemnification Agreement dated
March 7, 2006, among Seller, Depositor, the Initial Purchaser and the
Underwriters, relating to, among other things, information regarding the
Mortgage Loans in the Prospectus Supplement and the Offering Circular, subject
to all limitations therein contained, shall also be for the benefit of the
officers and directors of Depositor, the Underwriters and the Initial Purchaser
and any person or persons who control Depositor, the Underwriters and the
Initial Purchaser within the meaning of Section 15 of the Securities Act or
Section 20 of the Securities Exchange Act of 1934, as amended, and (b) the
rights of Depositor pursuant to this Agreement, subject to all limitations
herein contained, including those set forth in Section 7 of this Agreement, may
be assigned to the Trustee, for benefit of the Certificateholders, as may be
required to effect the purposes of the Pooling and Servicing Agreement and, upon
such assignment, the Trustee shall succeed to such rights of Depositor
hereunder; provided that the Trustee shall have no right to further assign such
rights to any other Person. No owner of a Certificate issued pursuant to the
Pooling and Servicing Agreement shall be deemed a successor or permitted assign
because of such ownership.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

                                      * * *

<PAGE>

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

                                       NCB, FSB
                                       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, 2006, between NCB, FSB and Credit Suisse First Boston Mortgage
Securities Corp. Capitalized terms used herein without definition have the
meanings given them in or by reference in the Agreement or, if not defined in
the Agreement, in the Pooling and Servicing Agreement.

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

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

            "Borrower" means the borrower under a Mortgage Loan.

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

            "Certificate Purchase Agreement" means the Certificate Purchase
Agreement, dated March 7, 2006, between Depositor and the Initial Purchaser.

            "Certificates" means the Credit Suisse First Boston Mortgage
Securities Corp., Commercial Mortgage Pass-Through Certificates, Series
2006-C1.

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

            "Closing Date" means March 22, 2006.

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

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

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

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

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

            "Depositor" shall have the meaning given such term in the first
sentence of this Agreement.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

            "Offering Circular" means the confidential offering circular dated
March 7, 2006, describing certain classes of the Private Certificates.

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

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

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

            "Prospectus" means the Prospectus dated March 7, 2006, that is a
part of Depositor's registration statement on Form S-3 (File No. 333-129918).

            "Prospectus Supplement" means the Prospectus Supplement, dated March
7, 2006, relating to the Publicly Offered Certificates.

            "Publicly Offered Certificates" means the Class A-1, Class A-2,
Class A-3, Class A-AB, Class A-3, Class A-4, Class A-1-A, Class A-M, Class A-J,
Class B, Class C, Class D, Class E and Class F Certificates.

            "Seller" shall have the meaning given such term in the first
sentence of this Agreement.

            "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 (subject to the first proviso in
Section 1).

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

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

            "Underwriters" means Credit Suisse Securities (USA) LLC, GMAC
Commercial Holding Capital Markets Corp., McDonald Investments Inc. and Banc of
America Securities LLC.

            "Underwriting Agreement" means the Underwriting Agreement, dated
March 8, 2006, between Depositor and the Underwriters.

<PAGE>

                                                                     SCHEDULE II

                             MORTGAGE LOAN SCHEDULE

                                 [see attached]

<PAGE>

<TABLE>
<CAPTION>
       Loan Group
#      #            Property Name                         Address
----   ----------   -----------------------------------   ---------------------------------------------------------
<S>    <C>          <C>                                   <C>
77     1            Phoenix Ranch Market                  5104-5126 North 67th Avenue and 6710-6756
                                                          West Camelback Road
79     2            Tall Oaks Apartments                  348 Tall Oaks Drive
92     1            Fed Ex Central Distribution Center    1650 47th Street
107    2            Coronet Hall Tenants Corp.            172-70 Highland Avenue
111    1            Finksburg Plaza                       3000 Gamber Road
116    1            Amelon Square                         U.S. Route 29 and State Route 130
125    2            111 East 85th Street Owners, Inc.     111 East 85th Street
126    1            Konterra Building L                   7051 Muirkirk Meadows Road
136    2            Butterfield House, Inc.               37 West 12th Street a/k/a 28 West 13th Street
148    2            Woodlands Owners, Inc.                3935 Blackstone Avenue
150    1            Mitre Office Building                 1155 Academy Park Loop
153    2            Salem Arms Apartments                 2243 Rosier Drive
164    2            10 East 70th Street, Inc.             10 East 70th Street
167    2            245 East 87th Street Tenants Corp.    245 East 87th Street
169    1            Provenzano's Real Estate Portfolio    2705 South H Street, 2309 Niles Street, 2225 Niles Street
181    2            639 Apartments Corp.                  639 West End Avenue
182    2            83rd Street Tenants, Inc.             8 East 83rd Street
190    2            Ocean Terrace Owners, Inc.            2650 Ocean Parkway
195    1            Ashley Oaks Shopping Center           1757 Ashley River Road
198    2            26 Gramercy Park Owners Corp.         26 Gramercy Park South
204    1            Promenade Plaza                       1705 Norman Drive
205    2            Linden Hill No. 2 Cooperative Corp.   26-21/28-01 Union Street, 142-14/20 26th Ave,
                                                          27-04/28-02 Parsons Boulevard
209    2            Skyline Terrace Cooperative, Inc.     350 Richmond Terrace
211    2            103 Gedney Street Owners', Inc.       103 Gedney Street
226    2            40 East 88 Owners, Inc.               40 East 88th Street
227    2            510 East 86th Street Owners, Inc.     510 East 86th Street
228    2            Ten Eighty Apartment Corporation      1080 Fifth Avenue
235    2            Evelyn Court Apartment Corp.          604 Tompkins Avenue
242    1            Shane Company, Store No. 25           10885 Haynes Bridge Road
243    1            Reisterstown Village Center           20-44 Main Street
248    2            Park East Apartments, Inc.            233 East 86th Street
249    2            Suburbia Owners, Inc.                 400 Fulton Street
255    2            525 East 82 Owners Corp.              525 East 82nd Street
256    2            72nd Street East Corporation          320 East 72nd Street
260    2            Stephen Gardens Corp.                 144-04/49 77th Road
261    2            Sans Souci Owners Corp.               110-50 71st Road
262    2            Kent Bentley Apartments, Inc.         2015 St. Paul Avenue
266    2            34-15 Properties Ltd.                 34-15 74th Street & 34-10 75th Street
280    2            321 West 90th St. Owners Corp.        321 West 90th Street
295    2            929 Park Avenue Apartment Corp.       929 Park Avenue
298    2            84-20 51st Ave. Owners Inc.           84-20 51st Avenue
308    2            194 Riverside Owners Corp.            194 Riverside Drive
313    2            81st Dwellers Inc.                    35 West 81st Street
318    2            West 15 Townhouse Corporation         161 West 15th Street
319    2            Palisade Gardens Apartments Corp.     150 Glenwood Avenue
320    1            Old Atlanta Shops                     3020 Old Atlanta Road
325    2            137-05 Franklin Avenue Owners, Inc.   137-05 Franklin Avenue
331    2            31 East 12th Street Owners, Inc.      31 East 12th Street
333    1            Frankfort Center                      20250 South La Grange Road
336    2            60 Tenants Corp.                      60 East 96th Street
340    2            Irving Place Tenant Corp.             126 East 16th Street
342    2            16 Canterbury Corp.                   16 Canterbury Road
353    1            Hollywood Video Plaza                 7045 Clarcona Ocoee Road
362    1            Cyrus-Coral, LLC                      2465 Coral Street
363    2            35 East Tenants Corp.                 35 East 30th Street
368    1            Crossroads Shopping Center            3125 Roswell Road
374    1            The Schwartz Building                 3705-3707 West Maple Road
378    2            45-53 Cabrini Owners Corp.            45-53 Cabrini Boulevard
383    2            838 Greenwich St. Corp.               838 Greenwich Street
389    2            11 East 92nd Street Tenants Corp.     11 East 92nd Street
390    2            No. 24 Gramercy Park, Inc.            24 Gramercy Park South a/k/a 134-136 East 20th Street
391    2            100 South Ocean Ave. Realty Corp.     100 South Ocean Avenue
397    2            Carolyn Court Owners, Inc.            314 Livingston Avenue
399    2            Courtland Glen Cooperative, Inc.      388, 394 and 398 Courtland Avenue
402    2            3755 Owners Ltd.                      3755 Henry Hudson Parkway
403    2            Jeffersonian Jay Street Corp.         8-12 Jay Street
409    2            431 West 54th Street, Inc.            431 West 54th Street
411    2            Charlton Cooperative Corp.            112 Charlton Street
412    2            80/Columbus Owners Corp.              121-123 West 80th Street
413    2            204-206 Owners Corp.                  204-206 West 10th Street
414    2            Fumoha Development Corp.              141 West 26th Street
415    2            1608 Ocean Parkway Owners Corp.       1608 Ocean Parkway
416    2            Phosphorus Crackled Roseville Corp.   52 White Street
417    2            557 3rd Owners Corp.                  557 Third Street

<CAPTION>
                                                       Units/
                                                       Sq. Ft./
                                     Zip               Rooms/     Original     Cut-off
#      City                  State   Code              Pads       Balance      Balance (1)
----   -------------------   -----   ---------------   --------   ----------   ----------
<S>    <C>                   <C>     <C>               <C>        <C>          <C>
77     Glendale              AZ      85303 and 85301   96,847     $9,000,000   $8,972,336
79     Conyers               GA      30013             172        $8,800,000   $8,787,771
92     San Diego             CA      92102             76,822     $7,600,000   $7,600,000
107    Jamaica Estates       NY      11432             141        $6,800,000   $6,800,000
111    Finksburg             MD      21048             83,635     $6,600,000   $6,600,000
116    Madison Heights       VA      24572             142,231    $6,500,000   $6,469,136
125    New York              NY      10028             161        $6,000,000   $6,000,000
126    Beltsville            MD      20705             53,057     $6,000,000   $6,000,000
136    New York              NY      10011             104        $5,500,000   $5,500,000
148    Riverdale             NY      10471             117        $5,000,000   $5,000,000
150    Colorado Springs      CO      80910             49,800     $5,000,000   $4,968,648
153    Augusta               GA      30909             136        $4,800,000   $4,793,330
164    New York              NY      10021             47         $4,500,000   $4,500,000
167    New York              NY      10128             118        $4,400,000   $4,386,706
169    Bakersfield           CA      Various           73,247     $4,300,000   $4,286,783
181    New York              NY      10025             60         $4,000,000   $3,990,288
182    New York              NY      10028             79         $4,000,000   $3,983,458
190    Brooklyn              NY      11235             190        $3,750,000   $3,728,371
195    Charleston            SC      29407             56,220     $3,700,000   $3,695,058
198    New York              NY      10003             69         $3,650,000   $3,638,104
204    Valdosta              GA      31601             59,575     $3,507,000   $3,495,842
205    Flushing              NY      11354             384        $3,500,000   $3,491,571
209    Staten Island         NY      10301             140        $3,500,000   $3,474,813
211    Nyack                 NY      10960             94         $3,300,000   $3,295,852
226    New York              NY      10128             86         $3,000,000   $3,000,000
227    New York              NY      10028             89         $3,000,000   $3,000,000
228    New York              NY      10128             53         $3,000,000   $3,000,000
235    Mamaroneck            NY      10543             70         $3,000,000   $2,983,968
242    Alpharetta            GA      30022             8,149      $2,900,000   $2,878,325
243    Reisterstown          MD      21136             21,545     $2,900,000   $2,872,051
248    New York              NY      10028             56         $2,800,000   $2,791,540
249    Farmingdale           NY      11735             90         $2,800,000   $2,780,118
255    New York              NY      10028             89         $2,600,000   $2,600,000
256    New York              NY      10021             41         $2,600,000   $2,600,000
260    Kew Gardens Hills     NY      11367             88         $2,500,000   $2,496,599
261    Forest Hills          NY      11375             130        $2,500,000   $2,493,268
262    Bronx                 NY      10461             66         $2,500,000   $2,487,237
266    Jackson Heights       NY      11372             160        $2,450,000   $2,415,245
280    New York              NY      10024             50         $2,200,000   $2,184,674
295    New York              NY      10028             38         $2,000,000   $1,994,742
298    Elmhurst              NY      11373             75         $2,000,000   $1,990,695
308    New York              NY      10025             40         $1,892,000   $1,889,387
313    New York              NY      10024             60         $1,850,000   $1,850,000
318    New York              NY      10011             61         $1,800,000   $1,800,000
319    Yonkers               NY      10703             60         $1,800,000   $1,794,531
320    Cumming               GA      30041             9,600      $1,780,000   $1,776,044
325    Flushing              NY      11355             109        $1,700,000   $1,694,994
331    New York              NY      10003             81         $1,600,000   $1,597,314
333    Frankfort             IL      60423             9,259      $1,600,000   $1,595,129
336    New York              NY      10128             75         $1,565,000   $1,565,000
340    New York              NY      10003             12         $1,500,000   $1,495,018
342    Great Neck            NY      11021             42         $1,500,000   $1,493,366
353    Orlando               FL      32818             9,450      $1,400,000   $1,396,883
362    Vista                 CA      92081             19,850     $1,300,000   $1,294,339
363    New York              NY      10016             44         $1,300,000   $1,285,604
368    Marietta              GA      30067             16,535     $1,200,000   $1,197,376
374    Bloomfield Township   MI      48301             12,000     $1,150,000   $1,143,025
378    New York              NY      10033             42         $1,100,000   $1,096,788
383    New York              NY      10014             28         $1,100,000   $1,094,408
389    New York              NY      10128             8          $1,000,000   $1,000,000
390    New York              NY      10003             28         $1,000,000   $1,000,000
391    Freeport              NY      11520             76         $1,000,000     $994,463
397    Mamaroneck            NY      10549             33           $950,000     $942,444
399    Stamford              CT      06906             43           $900,000     $895,839
402    Riverdale             NY      10463             91           $850,000     $838,509
403    New York              NY      10013             12           $825,000     $825,000
409    New York              NY      10019             20           $600,000     $595,970
411    New York              NY      10014             12           $580,000     $576,112
412    New York              NY      10024             14           $550,000     $548,628
413    New York              NY      10014             29           $500,000     $491,150
414    New York              NY      10001             7            $425,000     $424,071
415    Brooklyn              NY      11230             39           $425,000     $417,756
416    New York              NY      10013             4            $325,000     $323,620
417    Brooklyn              NY      11215             4            $170,000     $169,143

<CAPTION>
       Orig            Rem.            Orig           Rem.                         Net
       Amort.          Amort.          Term to        Term to            Interest  Interest
#      Term            Term (1)        Maturity (2)   Maturity (1) (2)   Rate      Rate
----   -------------   -------------   ------------   ----------------   ------    ------
<S>    <C>             <C>             <C>            <C>                <C>       <C>
77     360             357             120            117                5.8700%   5.7892%
79     360             359             120            119                5.5700%   5.4892%
92     360             360             120            116                5.4700%   5.3892%
107    Interest Only   Interest Only   120            117                5.0800%   4.9992%
111    360             360             120            118                5.6300%   5.5492%
116    300             297             120            117                5.4200%   5.3392%
125    Interest Only   Interest Only   120            115                5.0400%   4.9592%
126    360             360             120            118                5.5300%   5.4492%
136    360             360             120            115                5.3100%   5.2292%
148    Interest Only   Interest Only   180            177                5.4200%   5.3392%
150    300             296             120            116                5.5000%   5.4192%
153    360             359             120            119                5.5700%   5.4892%
164    Interest Only   Interest Only   120            117                5.1600%   5.0792%
167    480             475             120            115                5.1600%   5.0792%
169    360             357             120            117                5.8700%   5.7892%
181    360             358             120            118                5.2900%   5.2092%
182    420             415             120            115                5.1600%   5.0792%
190    360             355             120            115                5.1300%   5.0492%
195    360             359             60             59                 5.9500%   5.8692%
198    360             357             120            117                5.5600%   5.4792%
204    300             298             120            118                5.7100%   5.6292%
205    360             358             120            118                5.3400%   5.2592%
209    360             354             120            114                4.9600%   4.8792%
211    480             478             120            118                5.6700%   5.5892%
226    Interest Only   Interest Only   120            116                5.0300%   4.9492%
227    Interest Only   Interest Only   120            116                5.1000%   5.0192%
228    Interest Only   Interest Only   120            118                5.4800%   5.3992%
235    360             355             120            115                5.5200%   5.4392%
242    300             295             120            115                5.6900%   5.6092%
243    228             224             228            224                5.8800%   5.7992%
248    480             475             120            115                5.1600%   5.0792%
249    360             354             120            114                5.0300%   4.9492%
255    Interest Only   Interest Only   120            117                5.4700%   5.3892%
256    Interest Only   Interest Only   120            116                5.0000%   4.9192%
260    480             478             120            118                5.3000%   5.2192%
261    480             475             180            175                5.5600%   5.4792%
262    360             355             180            175                5.7500%   5.6692%
266    240             234             120            114                5.2500%   5.1692%
280    360             354             120            114                5.1300%   5.0492%
295    480             476             120            116                5.0100%   4.9292%
298    360             356             120            116                5.2100%   5.1292%
308    360             359             120            119                5.6300%   5.5492%
313    Interest Only   Interest Only   120            114                5.0300%   4.9492%
318    Interest Only   Interest Only   120            116                5.2700%   5.1892%
319    480             475             120            115                5.1400%   5.0592%
320    360             358             120            118                5.8300%   5.7492%
325    480             475             120            115                5.2500%   5.1692%
331    480             477             120            117                5.6100%   5.5292%
333    360             357             120            117                5.9200%   5.8392%
336    Interest Only   Interest Only   120            115                5.1000%   5.0192%
340    360             357             120            117                5.4600%   5.3792%
342    360             356             180            176                5.4800%   5.3992%
353    360             358             60             58                 5.8200%   5.7392%
362    300             297             120            117                5.9900%   5.9092%
363    240             235             240            235                5.7600%   5.6792%
368    360             358             180            178                5.9300%   5.8492%
374    300             296             120            116                5.7200%   5.6392%
378    480             475             120            115                5.2800%   5.1992%
383    420             414             120            114                5.2200%   5.1392%
389    Interest Only   Interest Only   120            118                5.6600%   5.5792%
390    Interest Only   Interest Only   120            116                5.0200%   4.9392%
391    360             355             120            115                5.3400%   5.2592%
397    300             295             120            115                5.4200%   5.3392%
399    360             355             120            115                6.2400%   6.1592%
402    180             176             180            176                6.2900%   6.2092%
403    Interest Only   Interest Only   120            115                5.3700%   5.2892%
409    300             296             120            116                5.0400%   4.9592%
411    360             354             120            114                5.3300%   5.2492%
412    480             475             180            175                6.0600%   5.9792%
413    180             175             180            175                5.6600%   5.5792%
414    480             476             120            116                5.7100%   5.6292%
415    180             175             180            175                6.1000%   6.0192%
416    360             355             180            175                6.6500%   6.5692%
417    360             354             120            114                6.7500%   6.6692%

<CAPTION>
                                         First
       Interest Calculation    Monthly   Payment     Maturity              LTV as
#      (30/360 / Actual/360)   Payment   Date        Date        ARD (3)    Co-op
----   ---------------------   -------   ---------   ---------   -------   ------
<S>    <C>                     <C>       <C>         <C>         <C>       <C>
77     Actual/360              $53,210   1/1/2006    12/1/2015   N/A          N/A
79     Actual/360              $50,353   3/1/2006    2/1/2016    N/A          N/A
92     Actual/360              $43,009   12/1/2005   11/1/2015   N/A          N/A
107    Actual/360              $29,186   1/1/2006    12/1/2015   N/A         28.8%
111    Actual/360              $38,014   2/1/2006    1/1/2016    N/A          N/A
116    Actual/360              $39,606   1/1/2006    12/1/2015   N/A          N/A
125    Actual/360              $25,550   11/1/2005   10/1/2015   N/A          4.3%
126    Actual/360              $34,180   2/1/2006    1/1/2016    N/A          N/A
136    Actual/360              $30,576   11/1/2005   10/1/2015   N/A          3.0%
148    Actual/360              $22,897   1/1/2006    12/1/2020   N/A         11.0%
150    Actual/360              $30,704   12/1/2005   11/1/2015   N/A          N/A
153    Actual/360              $27,465   3/1/2006    2/1/2016    N/A          N/A
164    Actual/360              $19,619   1/1/2006    12/1/2015   N/A          4.3%
167    Actual/360              $21,685   11/1/2005   10/1/2015   N/A          5.3%
169    Actual/360              $25,422   1/1/2006    12/1/2015   N/A          N/A
181    Actual/360              $22,187   2/1/2006    1/1/2016    N/A          5.9%
182    Actual/360              $20,598   11/1/2005   10/1/2015   N/A          4.3%
190    Actual/360              $20,430   11/1/2005   10/1/2015   N/A         10.9%
195    Actual/360              $22,065   3/1/2006    2/1/2011    N/A          N/A
198    Actual/360              $20,862   1/1/2006    12/1/2015   N/A         11.1%
204    Actual/360              $21,978   2/1/2006    1/1/2016    N/A          N/A
205    Actual/360              $19,523   2/1/2006    1/1/2016    N/A          4.9%
209    Actual/360              $18,703   10/1/2005   9/1/2015    N/A         14.5%
211    Actual/360              $17,404   2/1/2006    1/1/2016    N/A         11.4%
226    Actual/360              $12,750   12/1/2005   11/1/2015   N/A          2.3%
227    Actual/360              $12,927   12/1/2005   11/1/2015   N/A          3.0%
228    Actual/360              $13,890   2/1/2006    1/1/2016    N/A          2.0%
235    Actual/360              $17,071   11/1/2005   10/1/2015   N/A         24.9%
242    Actual/360              $18,139   11/1/2005   10/1/2015   N/A          N/A
243    Actual/360              $21,149   12/1/2005   11/1/2024   N/A          N/A
248    Actual/360              $13,800   11/1/2005   10/1/2015   N/A         10.7%
249    Actual/360              $15,082   10/1/2005   9/1/2015    N/A         16.7%
255    Actual/360              $12,016   1/1/2006    12/1/2015   N/A          6.8%
256    Actual/360              $10,984   12/1/2005   11/1/2015   N/A          2.0%
260    Actual/360              $12,556   2/1/2006    1/1/2016    N/A         17.5%
261    Actual/360              $12,996   11/1/2005   10/1/2020   N/A          7.1%
262    Actual/360              $14,589   11/1/2005   10/1/2020   N/A         34.7%
266    Actual/360              $16,509   10/1/2005   9/1/2015    N/A         10.9%
280    Actual/360              $11,985   10/1/2005   9/1/2015    N/A          7.7%
295    Actual/360               $9,657   12/1/2005   11/1/2015   N/A          5.0%
298    30/360                  $10,995   12/1/2005   11/1/2015   N/A         21.9%
308    Actual/360              $10,897   3/1/2006    2/1/2016    N/A          3.4%
313    Actual/360               $7,862   10/1/2005   9/1/2015    N/A          3.1%
318    Actual/360               $8,015   12/1/2005   11/1/2015   N/A          2.0%
319    Actual/360               $8,847   11/1/2005   10/1/2015   N/A         19.3%
320    Actual/360              $10,478   2/1/2006    1/1/2016    N/A          N/A
325    Actual/360               $8,481   11/1/2005   10/1/2015   N/A          9.6%
331    Actual/360               $8,372   1/1/2006    12/1/2015   N/A          4.2%
333    Actual/360               $9,511   1/1/2006    12/1/2015   N/A          N/A
336    Actual/360               $6,744   11/1/2005   10/1/2015   N/A          2.0%
340    Actual/360               $8,479   1/1/2006    12/1/2015   N/A          9.1%
342    Actual/360               $8,498   12/1/2005   11/1/2020   N/A         11.0%
353    Actual/360               $8,232   2/1/2006    1/1/2011    N/A          N/A
362    Actual/360               $8,368   1/1/2006    12/1/2015   N/A          N/A
363    Actual/360               $9,135   11/1/2005   10/1/2025   N/A          7.6%
368    Actual/360               $7,141   2/1/2006    1/1/2021    N/A          N/A
374    Actual/360               $7,214   12/1/2005   11/1/2015   N/A          N/A
378    Actual/360               $5,510   11/1/2005   10/1/2015   N/A          8.9%
383    30/360                   $5,707   10/1/2005   9/1/2015    N/A          6.9%
389    Actual/360               $4,782   2/1/2006    1/1/2016    N/A         14.1%
390    Actual/360               $4,241   12/1/2005   11/1/2015   N/A          3.0%
391    Actual/360               $5,578   11/1/2005   10/1/2015   N/A         11.8%
397    30/360                   $5,789   11/1/2005   10/1/2015   N/A         17.2%
399    Actual/360               $5,536   11/1/2005   10/1/2015   N/A         18.1%
402    Actual/360               $7,307   12/1/2005   11/1/2020   N/A          2.2%
403    30/360                   $3,692   11/1/2005   10/1/2015   N/A          5.7%
409    Actual/360               $3,522   12/1/2005   11/1/2015   N/A         10.6%
411    Actual/360               $3,232   10/1/2005   9/1/2015    N/A          3.6%
412    30/360                   $3,049   11/1/2005   10/1/2020   N/A          6.3%
413    Actual/360               $4,128   11/1/2005   10/1/2020   N/A          5.6%
414    Actual/360               $2,253   12/1/2005   11/1/2015   N/A          3.4%
415    Actual/360               $3,609   11/1/2005   10/1/2020   N/A          6.1%
416    Actual/360               $2,086   11/1/2005   10/1/2020   N/A          4.6%
417    Actual/360               $1,103   10/1/2005   9/1/2015    N/A          5.7%

<CAPTION>
                            Letter of   Ground   Earthquake        Environmental
#      Lockout/Defeasance   Credit      Lease    Insurance (Y/N)   Insurance (Y/N)
----   ------------------   ---------   ------   ---------------   ---------------
<S>    <C>                  <C>         <C>      <C>               <C>
77     Yes                  No          No       N/A               No
79     Yes                  No          No       N/A               No
92     Yes                  Yes         No       N/A               No
107    Yes                  No          No       N/A               No
111    Yes                  No          No       N/A               No
116    Yes                  Yes         No       N/A               No
125    Yes                  No          No       N/A               No
126    Yes                  No          No       N/A               No
136    Yes                  No          No       N/A               No
148    Yes                  No          No       N/A               No
150    Yes                  No          No       N/A               No
153    Yes                  No          No       N/A               No
164    Yes                  No          No       N/A               No
167    Yes                  No          No       N/A               No
169    Yes                  No          No       Yes               No
181    Yes                  No          No       N/A               No
182    Yes                  No          No       N/A               No
190    Yes                  No          No       N/A               No
195    Yes                  No          No       N/A               No
198    Yes                  No          No       N/A               No
204    Yes                  No          No       N/A               No
205    Yes                  No          No       N/A               No
209    Yes                  No          No       N/A               No
211    Yes                  No          No       N/A               No
226    Yes                  No          No       N/A               No
227    Yes                  No          No       N/A               No
228    Yes                  No          No       N/A               No
235    Yes                  No          No       N/A               No
242    Yes                  No          No       N/A               No
243    Yes                  Yes         No       N/A               No
248    Yes                  No          No       N/A               No
249    Yes                  No          No       N/A               No
255    Yes                  No          No       N/A               No
256    Yes                  No          No       N/A               No
260    Yes                  No          No       N/A               No
261    Yes                  No          No       N/A               No
262    Yes                  No          No       N/A               No
266    Yes                  No          No       N/A               No
280    Yes                  No          No       N/A               No
295    Yes                  No          No       N/A               No
298    Yes                  No          No       N/A               No
308    Yes                  No          No       N/A               No
313    Yes                  No          No       N/A               No
318    Yes                  No          No       N/A               No
319    Yes                  No          No       N/A               No
320    Yes                  No          No       N/A               No
325    Yes                  No          No       N/A               No
331    Yes                  No          No       N/A               No
333    Yes                  No          No       N/A               No
336    Yes                  No          No       N/A               No
340    Yes                  No          No       N/A               No
342    Yes                  No          No       N/A               No
353    Yes                  No          No       N/A               No
362    Yes                  No          No       N/A               No
363    Yes                  No          No       N/A               No
368    Yes                  No          No       N/A               No
374    Yes                  No          No       N/A               No
378    Yes                  No          No       N/A               No
383    Yes                  No          No       N/A               No
389    Yes                  No          No       N/A               No
390    Yes                  No          No       N/A               No
391    Yes                  No          No       N/A               No
397    Yes                  No          No       N/A               No
399    Yes                  No          No       N/A               No
402    Yes                  No          No       N/A               No
403    Yes                  No          No       N/A               No
409    Yes                  No          No       N/A               No
411    Yes                  No          No       N/A               No
412    Yes                  No          No       N/A               No
413    Yes                  No          No       N/A               No
414    Yes                  No          No       N/A               No
415    Yes                  No          No       N/A               No
416    Yes                  No          No       N/A               No
417    Yes                  No          No       N/A               No

<CAPTION>
       Master                Master
#      Servicing Fee Rate    Servicer
----   ------------------    ----------------------------------
<S>    <C>                   <C>
77                0.08000%   National Consumer Cooperative Bank
79                0.08000%   National Consumer Cooperative Bank
92                0.08000%   National Consumer Cooperative Bank
107               0.08000%   National Consumer Cooperative Bank
111               0.08000%   National Consumer Cooperative Bank
116               0.08000%   National Consumer Cooperative Bank
125               0.08000%   National Consumer Cooperative Bank
126               0.08000%   National Consumer Cooperative Bank
136               0.08000%   National Consumer Cooperative Bank
148               0.08000%   National Consumer Cooperative Bank
150               0.08000%   National Consumer Cooperative Bank
153               0.08000%   National Consumer Cooperative Bank
164               0.08000%   National Consumer Cooperative Bank
167               0.08000%   National Consumer Cooperative Bank
169               0.08000%   National Consumer Cooperative Bank
181               0.08000%   National Consumer Cooperative Bank
182               0.08000%   National Consumer Cooperative Bank
190               0.08000%   National Consumer Cooperative Bank
195               0.08000%   National Consumer Cooperative Bank
198               0.08000%   National Consumer Cooperative Bank
204               0.08000%   National Consumer Cooperative Bank
205               0.08000%   National Consumer Cooperative Bank
209               0.08000%   National Consumer Cooperative Bank
211               0.08000%   National Consumer Cooperative Bank
226               0.08000%   National Consumer Cooperative Bank
227               0.08000%   National Consumer Cooperative Bank
228               0.08000%   National Consumer Cooperative Bank
235               0.08000%   National Consumer Cooperative Bank
242               0.08000%   National Consumer Cooperative Bank
243               0.08000%   National Consumer Cooperative Bank
248               0.08000%   National Consumer Cooperative Bank
249               0.08000%   National Consumer Cooperative Bank
255               0.08000%   National Consumer Cooperative Bank
256               0.08000%   National Consumer Cooperative Bank
260               0.08000%   National Consumer Cooperative Bank
261               0.08000%   National Consumer Cooperative Bank
262               0.08000%   National Consumer Cooperative Bank
266               0.08000%   National Consumer Cooperative Bank
280               0.08000%   National Consumer Cooperative Bank
295               0.08000%   National Consumer Cooperative Bank
298               0.08000%   National Consumer Cooperative Bank
308               0.08000%   National Consumer Cooperative Bank
313               0.08000%   National Consumer Cooperative Bank
318               0.08000%   National Consumer Cooperative Bank
319               0.08000%   National Consumer Cooperative Bank
320               0.08000%   National Consumer Cooperative Bank
325               0.08000%   National Consumer Cooperative Bank
331               0.08000%   National Consumer Cooperative Bank
333               0.08000%   National Consumer Cooperative Bank
336               0.08000%   National Consumer Cooperative Bank
340               0.08000%   National Consumer Cooperative Bank
342               0.08000%   National Consumer Cooperative Bank
353               0.08000%   National Consumer Cooperative Bank
362               0.08000%   National Consumer Cooperative Bank
363               0.08000%   National Consumer Cooperative Bank
368               0.08000%   National Consumer Cooperative Bank
374               0.08000%   National Consumer Cooperative Bank
378               0.08000%   National Consumer Cooperative Bank
383               0.08000%   National Consumer Cooperative Bank
389               0.08000%   National Consumer Cooperative Bank
390               0.08000%   National Consumer Cooperative Bank
391               0.08000%   National Consumer Cooperative Bank
397               0.08000%   National Consumer Cooperative Bank
399               0.08000%   National Consumer Cooperative Bank
402               0.08000%   National Consumer Cooperative Bank
403               0.08000%   National Consumer Cooperative Bank
409               0.08000%   National Consumer Cooperative Bank
411               0.08000%   National Consumer Cooperative Bank
412               0.08000%   National Consumer Cooperative Bank
413               0.08000%   National Consumer Cooperative Bank
414               0.08000%   National Consumer Cooperative Bank
415               0.08000%   National Consumer Cooperative Bank
416               0.08000%   National Consumer Cooperative Bank
417               0.08000%   National Consumer Cooperative Bank
</TABLE>

(1)   Based on a Cut-off date in March 2006.
(2)   At maturity with respect to Balloon Loans or at the anticipated repayment
      date in the case of ARD Loans.
(3)   Anticipated Repayment Date.

<PAGE>

                                                                    SCHEDULE III

                 MORTGAGE LOANS CONSTITUTING MORTGAGE GROUPS

                                      None

<PAGE>

                                                                     SCHEDULE IV

                         MORTGAGE LOANS WITH LOST NOTES

                                      None

<PAGE>

                                                                      SCHEDULE V

                             EXCEPTIONS TO SELLER'S
                         REPRESENTATIONS AND WARRANTIES

        EXCEPTIONS TO REPRESENTATIONS AND WARRANTIES REGARDING INDIVIDUAL
                      MORTGAGE LOANS (2006-C1) (NCB, FSB)

Rep No.   Mortgage Loan (Borrower)   Explanation
-------   ------------------------   -----------

 xxxvi    Mortgage Loans with        Schedule V-1 lists Mortgage Loans with
          existing subordinate       subordinate secured indebtedness or
          secured indebtedness or    mezzanine financing.
          existing mezzanine
          financing.

 xxxviii  Mortgage Loans secured by  The Borrowers on loans secured by
          residential cooperative    residential cooperative properties are
          properties.                permitted to incur contractual liability
                                     in certain limited amounts as more
                                     particularly set forth in the applicable
                                     Mortgage.

<PAGE>

                                  Schedule V-1

   Mortgage Loans With Subordinate Secured Indebtedness or Mezzanine Financing

LOAN                                SUBORDINATE SECURED INDEBTEDNESS/
                                    MEZZANINE FINANCING

10 East 70th Street, Inc.           $1,000,000
100 South Ocean Avenue Realty Corp. $250,000
103 Gedney Street Owners            $500,000
111 East 85th Street Owners, Inc.   $3,000,000
137-05 Franklin Avenue Owners, Inc. $500,000
16 Canterbury Corp.                 $250,000
1608 Ocean Parkway Owners Corp.     $200,000
194 Riverside Owners Corp.          $300,000.00
204-206 Owners Corp.                $200,000
245 East 87th Street Tenants Corp.  $1,000,000
26 Gramercy Park Owners Corp.       $500,000
31 East 12th Street Owners, Inc.    $100,000
321 West 90th St. Owners Corp.      $500,000
34-15 Properties, Ltd.              $1,000,000
35 East Tenants Corp.               $200,000
40 East 88 Owners, Inc.             $2,000,000
431 West 54th Street, Inc.          $150,000
45-53 Cabrini Owners Corp.          $200,000
510 East 86th Street Owners, Inc.   $1,000,000
557 3rd Owners Corp.                $50,000
60 Tenants Corp.                    $500,000
639 Apartments Corp.                $500,000.00
72nd Street East Corporation        $500,000
80/Columbus Owners Corp.            $100,000
81st Dwellers Inc.                  $500,000
84-20 51st Avenue Owners, Inc.      $250,000
929 Park Avenue Apartment Corp.     $750,000
Butterfield House, Inc.             $500,000
Carolyn Court Owners, Inc.          $250,000
Evelyn Court Apartment Corp.        $100,000
Irving Place Tenant Corp.           $250,000
Jeffersonian Jay Street Corp.       $200,000
Kent Bentley Apts., Inc.            $500,000
Linden Hill No. 2 Cooperative Corp. $500,000.00
Ocean Terrace Owners, Inc.          $1,000,000
Palisade Gardens Apartments Corp.   $100,000
Park East Apartments, Inc.          $1,000,000
Stephen Gardens Corp.               $500,000
Suburbia Owners, Inc.               $250,000
Ten Eighty Apartment Corporation    $500,000.00
Woodlands Owners, Inc.              $1,000,000
Tall Oaks Apartments                The members of borrower have pledged their
                                    limited liability company membership
                                    interests to a previous lender to secure
                                    certain cash flow mezzanine indebtedness.
                                    The amount payable to the previous lender
                                    is equal to 50% of net cash flow generated
                                    by the property after payment of expenses,
                                    including debt service payments and loan
                                    reserves. Seller and the previous lender
                                    have entered into a Subordination,
                                    Standstill and Intercreditor Agreement in
                                    connection with this cash flow mezzanine
                                    indebtedness.
Salem Arms Apartments               The members of borrower have pledged their
                                    limited liability company membership
                                    interests to a previous lender to secure
                                    certain cash flow mezzanine indebtedness.
                                    The amount payable to the previous lender
                                    is equal to 50% of net cash flow generated
                                    by the property after payment of expenses,
                                    including debt service payments and loan
                                    reserves. Seller and the previous lender
                                    have entered into a Subordination,
                                    Standstill and Intercreditor Agreement in
                                    connection with this cash flow mezzanine
                                    indebtedness.

<PAGE>

                                                                       EXHIBIT A

                         REPRESENTATIONS AND WARRANTIES

                          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, except for interests in servicing rights created
or granted under the Pooling and Servicing Agreement, subservicing agreements
and/or servicing rights purchase agreements being executed and delivered in
connection herewith;

            (v) 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 bonded over, escrowed for or insured against by a lender's title
insurance policy (as described below). A UCC Financing Statement has been filed
and/or recorded (or sent for filing or recording) in all places necessary to
perfect a valid security interest in the personal property necessary to operate
the Mortgaged Property; 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 its equivalent as adopted in the applicable jurisdiction, provided
that if such policy is yet to be issued, such insurance may be evidenced by a
"marked-up" commitment for title insurance, a pro forma or specimen title
insurance policy or signed escrow instructions, which in any case are binding on
the subject title insurer, 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, (C) the exceptions (general and specific)
and exclusions set forth in such policy, none of which, individually or in the
aggregate, materially interferes with the current general use of the Mortgaged
Property or materially interferes with the security intended to be provided by
such Mortgage or with the related Borrower's ability to pay its obligations when
they become due or the value of the Mortgaged Property, (D) the rights of
tenants, as tenants only, under leases, including subleases, pertaining to the
related Mortgaged Property, (E) if the related Mortgage Loan is
cross-collateralized with any other Mortgage Loan in the trust fund, the lien of
the Mortgage for that other Mortgage Loan, (F) if the related Mortgage Loan is a
CBA A Loan, the portion of the lien of the related Mortgage that secures the
related CBA B Loan and (G) if the related Mortgaged Property is a unit in a
condominium, the related condominium declaration (items (A), (B), (C), (D), (E),
(F) and (G), collectively "Permitted Encumbrances"), and with respect to each
Mortgage Loan, such Permitted Encumbrances do not, individually or in the
aggregate, materially interfere with the security intended to be provided by the
related Mortgage, the current principal use of the related Mortgaged Property,
the value of the related Mortgaged Property or the current ability of the
related Mortgaged Property to generate income sufficient to service such
Mortgage Loan; the premium for such policy was paid in full; such policy (or if
it is yet to be issued, the coverage to be afforded thereby) is issued by a
title insurance company licensed to issue policies in the state in which the
related Mortgaged Property is located (unless such state is Iowa) and is
assignable (with the related Mortgage Loan) to 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 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 or a letter of credit
have been established to cover the costs to remediate such damage or the
reasonable estimation of the costs to remediate such damage was no more than
$50,000, 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, any permitted
subservicing agreements and/or servicing rights purchase agreements being
executed and delivered in connection therewith;

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

            (xxii) All escrow deposits and payments required to be in the
possession or under the control of the Seller 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 30 days or more past due) 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. A Phase I
environmental report (or, with respect to certain residential cooperative loans
with an original principal balance of $500,000 or less, a transaction screen
process report meeting ASTM standards) 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 (or transaction screen) did not indicate any material non-compliance with
applicable environmental laws or material existence of hazardous materials or,
if any material non-compliance or material existence of hazardous materials was
indicated in any such report, 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, or a letter of credit in
such amount has been provided, 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 $87,700 and 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 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 best of 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) or, if the related Mortgaged Property is a residential
cooperative property, transfers of stock of the related Borrower in connection
with the assignment of a proprietary lease for a unit in the related Mortgaged
Property by a tenant-shareholder of the related Borrower to other persons who by
virtue of such transfers become tenant-shareholders in the related Borrower,
each Mortgage Loan 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, the current use of the Mortgaged Property or
the related Borrower's operations at the Mortgaged Property;

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

            (xxxi) With respect to any Mortgage Loan where all or 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 best of 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
                  therefor) 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 a prudent commercial mortgage lender. The lessor is not
                  permitted, in absence of an uncured default, to disturb the
                  possession, interest or quiet enjoyment of any subtenant of
                  the lessee in the relevant portion of the Mortgaged Property
                  subject to the ground lease for any reason, or in any manner,
                  which would adversely affect the security provided by the
                  related Mortgage;

            (J)   Under the terms of the ground lease and the related Mortgage,
                  any related insurance proceeds or condemnation award (other
                  than in respect of a total or substantially total loss or
                  taking) will be applied either to the repair or restoration of
                  all or part of the related Mortgaged Property, with the lender
                  or a trustee appointed by it having the right to hold and
                  disburse such proceeds as repair or restoration progresses
                  (except in 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 to the payment of the outstanding principal
                  balance of the Mortgage Loan, together with any accrued
                  interest, except that in the case of condemnation awards, the
                  ground lessor may be entitled to a portion of such award;

            (K)   Under the terms of the ground lease and the related Mortgage,
                  any related insurance proceeds, or condemnation award in
                  respect of a total or substantially total loss or taking of
                  the related Mortgaged Property will be applied first to the
                  payment of the outstanding principal balance of the Mortgage
                  Loan, together with any accrued interest (except as provided
                  by applicable law or in cases where a different allocation
                  would not be viewed as commercially unreasonable by a prudent
                  commercial mortgage lender, taking into account the relative
                  duration of the ground lease and the related Mortgage and the
                  ratio of the market value of the related Mortgaged Property to
                  the outstanding principal balance of such Mortgage Loan).
                  Until the principal balance and accrued interest are paid in
                  full, neither the lessee nor the lessor under the ground lease
                  will have an option to terminate or modify the ground lease
                  without the prior written consent of the lender as a result of
                  any casualty or partial condemnation, 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) Except in cases where the related Mortgaged Property is a
residential cooperative property, the Mortgage Loan Documents executed in
connection with each Mortgage Loan having an original principal balance in
excess of $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 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 is covered by an endorsement with respect to the matters
described in (A), (B) or (C) under the related title insurance policy (or the
binding commitment therefor);

            (xli) Based solely on a flood zone certification or a survey of the
related Mortgaged Property, if any portion of the improvements on the Mortgaged
Property is located in an area identified by the Federal Emergency Management
Agency or the Secretary of Housing and Urban Development as having special flood
hazards categorized as Zone "A" or Zone "V" and flood insurance is available,
the terms of the Mortgage Loan require the Borrower to maintain flood insurance,
or at such Borrower's failure to do so, authorizes the Lender to maintain such
insurance at the cost and expense of the Borrower;

            (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 or condemnation awards 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 in the lending area
where the subject Mortgaged Property is located, the improvements located on or
forming part of each Mortgaged Property comply with applicable zoning laws and
ordinances, or constitute a legal non-conforming use or structure or, if any
such improvement does not so comply, such non-compliance does not materially and
adversely affect the value of the related Mortgaged Property. With respect to
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 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) in an amount sufficient to make all
scheduled payments under the Mortgage Loan when due, (C) the Borrower is
required to provide independent certified public accountant's certification that
the collateral is sufficient to make such payments, (D) the loan may be required
to be assumed by a single-purpose entity designated by the holder of the
Mortgage Loan, (E) the Borrower is required to provide an opinion of counsel
that the Trustee has a perfected security interest in such collateral prior to
any other claim or interest, (F) the Borrower is required to pay all Rating
Agency fees associated with defeasance (if rating confirmation is a specific
condition precedent thereto) and all other reasonable expenses associated with
defeasance, including, but not limited to, accountant's fees and opinions of
counsel, (G) with respect to any Significant 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 (H) 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; and provided, further, that if the related Mortgaged Property is a
residential cooperative property, then the subject Mortgage Loan is fully
recourse to the related Borrower;

            (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 all the mortgage loans sold
to the Depositor by Column Financial, Inc. ("Column"), KeyBank National
Association ("Key") and GMAC Commercial Mortgage Corporation ("GMACCM") pursuant
to those certain Mortgage Loan Purchase Agreements each dated as of March 1,
2006 between the Depositor and Column, Key and GMACCM, respectively; 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 NCB, FSB ("NCB, FSB");

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

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

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

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

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

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

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

            8. upon assignment of the Note by _______________ to Credit Suisse
First Boston Mortgage Securities Corp. (the "Depositor") and subsequent
assignment by Depositor to the trustee for the benefit of the holders of the
Credit Suisse First Boston Mortgage Securities Corp. Commercial Mortgage
Pass-Through Certificates, Series 2006-C1 (the "Trustee") (which assignment may,
at the discretion of Depositor, be made directly by _______________ to the
Trustee), _______________ covenants and agrees (a) promptly to deliver to the
Trustee the original Note if it is subsequently found, and (b) to indemnify and
hold harmless the Trustee and its successors and assigns from and against any
and all costs, expenses and monetary losses arising as a result of
_______________'s failure to deliver said original Note to the Trustee.

                                       NCB, FSB

                                       By:____________________________________
                                          Name:
                                          Title:

Sworn to before me this _____
day of __________, 2006EXHIBIT 4.6

              CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
                                    Depositor

          Commercial Mortgage Pass-Through Certificates, Series 2006-C1

                             UNDERWRITING AGREEMENT
                             ----------------------

                                                                   March 7, 2006

CREDIT SUISSE SECURITIES (USA) LLC
Eleven Madison Avenue
New York, New York  10010

MCDONALD INVESTMENTS INC.
127 Public Square
Cleveland, Ohio 44114

GMAC COMMERCIAL HOLDING CAPITAL MARKETS CORP.
200 Witmer Road
Horsham, Pennsylvania  19044

BANC OF AMERICA SECURITIES LLC
214 North Tryon Street
NC1-027-22-03
Charlotte, North Carolina  28255

Ladies and Gentlemen:

      1. Introductory. Credit Suisse First Boston Mortgage Securities Corp., a
Delaware corporation (the "Depositor"), proposes to form one or more real estate
mortgage investment conduits (the "Trust"), which will issue securities entitled
Credit Suisse First Boston Mortgage Securities Corp. Commercial Mortgage
Pass-Through Certificates, (the "Certificates"), Series 2006-C1. Each
Certificate will evidence a fractional undivided, percentage interest or
beneficial interest in the Trust. The terms on which the Trust will issue the
Certificates will be specified in the Prospectus (as defined herein). The
property of the Trust will consist of a pool of 471 fixed rate mortgage loans,
secured by 527 multifamily and commercial properties (collectively, the
"Mortgage Loans") that will be purchased by the Depositor from Column Financial,
Inc. (the "Column Mortgage Loan Seller"), GMAC Commercial Mortgage Corporation
(the "GMAC Mortgage Loan Seller"), KeyBank National Association (the "KeyBank
Mortgage Loan Seller") and NCB, FSB (the "NCB, FSB Mortgage Loan Seller" and
together with the Column Mortgage Loan Seller, the KeyBank Mortgage Loan Seller
and the GMAC Mortgage Loan Seller, the "Mortgage Loan Sellers"), pursuant to
those certain Mortgage Loan Purchase Agreements, each dated as of March 1, 2006
(the "Mortgage Loan Purchase Agreements"), and will be serviced by GMAC
Commercial Mortgage Corporation, KeyCorp Real Estate Capital Markets, Inc. and
NCB, FSB, each as a Master Servicer of their respective group of Mortgage Loans
as set forth in the Pooling and Servicing Agreement (defined below)
(collectively the "Master Servicers"), and if and when necessary GMAC Commercial
Mortgage Corporation or National Consumer Cooperative Bank as Special Servicer
of their respective group of mortgage loans as set forth in the Pooling and
Servicing Agreement (collectively the "Special Servicers"), pursuant to that
certain Pooling and Servicing Agreement (the "Pooling and Servicing Agreement"),
to be dated as of March 1, 2006, by and among the Depositor, the Master
Servicers, the Special Servicers and Wells Fargo Bank, N.A., as trustee (the
"Trustee"), and certain related property to be conveyed to the Trust by the
Depositor (the "Trust Fund"). The Mortgage Loans will be transferred to the
Trust, and the Certificates will be issued pursuant to the Pooling and Servicing
Agreement.

      The offering of the Certificates made pursuant to the Registration
Statement (as defined below) will be made through you as underwriters. This
Agreement provides for the sale of such Certificates to, and the purchase and
offering thereof by, you, as underwriters (the "Underwriters" and, individually,
an "Underwriter"). Schedule I shall specify the principal or notional balance of
each Class of the Certificates to be issued and any terms thereof not otherwise
specified in the Pooling and Servicing Agreement, the Classes of Certificates
subject to this Agreement, the price at which such Certificates are to be
purchased by the Underwriters from the Depositor, the aggregate amount of
Certificates to be purchased by you and the initial public offering price or the
method by which the price at which such Certificates are to be sold will be
determined. The offering of the Certificates will be governed by this Agreement.

      At or prior to the time when sales to purchasers of the Certificates were
first made, which was approximately 1:30 p.m. on March 7, 2006 (the "Time of
Sale"), the Depositor had prepared the following information (collectively, the
"Rule 159 Information"): the Depositor's Free Writing Prospectus dated February
24, 2006 (the cover page of which is attached hereto as Annex A) to the
Depositor's Prospectus dated February 24, 2006, and the Depositor's Prospectus
dated February 24, 2006, the term sheet dated February 24, 2006, relating to the
Certificates, and each "free-writing prospectus" (as defined pursuant to Rule
405 under the 1933 Act) (a "Free Writing Prospectus") the first page of each of
which is attached as Annex B hereto. If, subsequent to the date of this
Agreement, the Depositor and the Underwriters determine that such information
included an untrue statement of material fact or omitted to state a material
fact necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading and terminate their old
purchase contracts and enter into new purchase contracts with investors in the
Certificates, then "Rule 159 Information" will refer to the information conveyed
to purchasers at the time of entry into the first such new purchase contract,
including any information that corrects such material misstatements or omissions
("Corrective Information") and "Time of Sale" will refer to the time and date on
which such new purchase contracts were entered into.

      2. Representations and Warranties of the Depositor.

      The Depositor represents and warrants to you as of the date hereof as
follows:

      (a) The Depositor has filed with the Securities and Exchange Commission
(the "Commission") a registration statement (No. 333-129918) on Form S-3 for the
registration of the Certificates under the Securities Act of 1933, as amended
(the "1933 Act"), which registration statement has become effective. The
Depositor proposes to file with the Commission pursuant to Rule 424(b) under the
1933 Act a supplement to the form of prospectus included in such registration
statement relating to the Certificates and the plan of distribution thereof.
Such registration statement, including the exhibits thereto and information that
is contained in the Prospectus (as defined below) and is deemed to be part of
and included in such registration statement, as such registration statement may
have been amended or supplemented at the date of the Prospectus, and including
the Prospectus, is hereinafter referred to as the "Registration Statement"; the
prospectus first required to be filed to satisfy the condition set forth in Rule
172(c) and pursuant to Rule 424(b) under the 1933 Act, is hereinafter referred
to as the "Base Prospectus"; such form of supplement to the Base Prospectus
relating to the Certificates, in the form first required to be filed to satisfy
the condition set forth in Rule 172(c) and pursuant to Rule 424(b) under the
1933 Act (including the Base Prospectus as so supplemented) is hereinafter
referred to as the "Prospectus Supplement"; and the Base Prospectus and the
Prospectus Supplement, together, are hereinafter referred to as the
"Prospectus." The conditions to the use of a registration statement on Form S-3
under the Act, as set forth in the General Instructions to Form S-3, and the
conditions of Rule 415 under the Act have been satisfied with respect to the
Registration Statement; and no other amendment to the Registration Statement
will be filed which shall have been reasonably disapproved by you promptly after
reasonable notice thereof. There is no request by the Commission for any further
amendment of the Registration Statement or the Prospectus or for any additional
information; the Commission has not issued any stop order suspending the
effectiveness of the Registration Statement and the Depositor is not aware of
any proceeding for that purpose having been instituted or threatened; and there
has been no notification with respect to the suspension of the qualification for
sale of the Certificates for sale in any jurisdiction or any proceeding for such
purpose having been instituted or threatened;

      (b) the Registration Statement (i) on its effective date and on the date
of the then most recently filed Prospectus Supplement conformed in all respects
to the requirements of the 1933 Act and the rules and regulations thereunder
(the "Rules and Regulations") and did not include any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein not misleading and (ii) on the date
hereof will conform in all respects to the requirements of the 1933 Act and the
Rules and Regulations thereunder and will not include any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein not misleading and the Prospectus on
the date hereof and on the Specified Delivery Date (as defined in Section 3
hereof) will conform in all respects to the requirements of the 1933 Act and the
Rules and Regulations thereunder and will not include any untrue statement of a
material fact or omit to state any material fact required to be stated therein
or necessary to make the statements therein, in the light of the circumstances
under which they were made, not misleading; provided, however, that the
foregoing does not apply to statements in or omissions from either the
Registration Statement or the Prospectus to the extent based upon and in
conformity with (A) written information furnished to the Depositor by any
Underwriter specifically for use therein (the "Underwriter Information"), and
(B) the Mortgage Loan Seller's Information (collectively as defined in each of
the Indemnification Agreements, dated as of the date hereof (the
"Indemnification Agreements"), by and among the Depositor, each Mortgage Loan
Seller and each Underwriter);

      (c) There is no request by the Commission for any further amendment of the
Registration Statement or the Prospectus or for any additional information; the
Commission has not issued any stop order suspending the effectiveness of the
Registration Statement and the Depositor is not aware of any proceeding for that
purpose having been instituted or threatened; and there has been no notification
with respect to the suspension of the qualification for sale of the Certificates
for sale in any jurisdiction or any proceeding for such purpose having been
instituted or threatened;

      (d) The Rule 159 Information, at the Time of Sale, did not, and at the
Closing Date will not, contain any untrue statement of a material fact or omit
to state a material fact necessary in order to make the statements therein, in
the light of the circumstances under which they were made, not misleading;
provided that the Depositor makes no representation and warranty with respect to
(A) any statements or omissions made in reliance upon and in conformity with the
Underwriter Information or (B) any Mortgage Loan Seller Information contained in
or omitted from such Time of Sale Information. The parties acknowledge that none
of the Underwriters has furnished any Underwriter Information to the Depositor
expressly for use in the Rule 159 Information.

      (e) Other than the Prospectus, the Depositor (including its agents and
representatives other than the Underwriters in their capacity as such) has not
made, used, prepared, authorized, approved or referred to and will not make,
use, prepare, authorize, approve or refer to any "written communication" (as
defined in Rule 405 under the 1933 Act) that constitutes an offer to sell or
solicitation of an offer to buy the Certificates other than (i) any document not
constituting a prospectus pursuant to Section 2(a)(10)(a) of the 1933 Act or
Rule 134 under the 1933 Act, (ii) the Rule 159 Information, and (iii) each other
written communication of the Depositor or its agents and representatives
approved by the Underwriters either in writing in advance or in any other manner
mutually agreed by the Underwriters and the Depositor (each such communication
referred to in clause (ii) and this clause (iii) constituting an Issuer Free
Writing Prospectus (as defined in Section 8(b) hereof). Each such Issuer Free
Writing Prospectus complied or, if used after the date hereof, will comply, in
all material respects with the 1933 Act and the rules and regulations
promulgated thereunder, has been filed or will be filed in accordance with
Section 8 (to the extent required thereby) and did not at the Time of Sale, and
at the Closing Date will not, contain any untrue statements of a material fact
or (when read in conjunction with the other Rule 159 Information) omit to state
a material fact necessary in order to make the statements therein, in the light
of the circumstances under which they were made, not misleading; provided that
the Depositor makes no representation and warranty with respect to (i) any
statements or omissions made in reliance upon and in conformity with the
Underwriter Information or (ii) any Mortgage Loan Seller Information contained
in or omitted from any Issuer Free Writing Prospectus. The parties acknowledge
that none of the Underwriters has furnished any Underwriter Information to the
Depositor expressly for use in any Issuer Free Writing Prospectus.

      (f) the Depositor has been 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
described in the Prospectus, 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 be so qualified would not have a material adverse effect on the
Depositor, and is conducting its business so as to comply in all material
respects with the applicable statutes, ordinances, rules and regulations of the
jurisdictions in which it is conducting business;

      (g) the Pooling and Servicing Agreement, the Mortgage Loan Purchase
Agreements and the Certificates conform, or will conform as of the Specified
Delivery Date, to the description thereof contained in the Registration
Statement and the Prospectus; and the Certificates, on the date hereof, will
have been duly and validly authorized and, when such Certificates are duly and
validly executed by the Depositor or the Trustee, authenticated by the Trustee
and delivered in accordance with the Pooling and Servicing Agreement and
delivered and paid for as provided herein, will be validly issued and
outstanding and entitled to the benefits afforded by the Pooling and Servicing
Agreement;

      (h) the Depositor is not in violation of its certificate of incorporation
or by-laws or in default under any agreement, indenture or instrument the effect
of which violation or default would be material and adverse to the Depositor or
which violation or default would have a material adverse effect on the
performance by the Depositor of its obligations under this Agreement, the
Pooling and Servicing Agreement, the Certificates or any of the Mortgage Loan
Purchase Agreements; there are no actions or proceedings against, or
investigations of, the Depositor pending, or, to the knowledge of the Depositor,
threatened, before any court, administrative agency or other tribunal (i)
asserting the invalidity of this Agreement, the Pooling and Servicing Agreement,
any of the Mortgage Loan Purchase Agreements or the Certificates, (ii) seeking
to prevent the issuance of the Certificates or the consummation of any of the
transactions contemplated by this Agreement, (iii) which might materially and
adversely affect the performance by the Depositor of its obligations under, or
the validity or enforceability against the Depositor of, this Agreement, the
Pooling and Servicing Agreement, any of the Mortgage Loan Purchase Agreements or
the Certificates or (iv) seeking to affect adversely the federal income tax
attributes of the Certificates described in the Prospectus;

      (i) there has not been, and as of the Specified Delivery Date there will
not be, any material adverse change in the business operations, financial
condition, properties or assets of the Depositor since the date of its latest
audited financial statements which would have a material adverse effect on the
ability of the Depositor to perform its obligations under this Agreement, the
Pooling and Servicing Agreement or any of the Mortgage Loan Purchase Agreements;

      (j) there are no contracts, indentures or other documents of a character
required by the 1933 Act or by the rules and regulations thereunder to be
described or referred to in the Registration Statement or the Prospectus or to
be filed as exhibits to the Registration Statement which have not been so
described or referred to therein or so filed or incorporated by reference as
exhibits thereto;

      (k) the Depositor possesses all material licenses, certificates,
authorizations or permits issued by the appropriate state, federal or foreign
regulatory agencies or bodies necessary to conduct the business now operated by
it, and the Depositor has not received any notice of proceedings relating to the
revocation or modification of any such license, certificate, authorization or
permit which, singly or in the aggregate, if the subject of any unfavorable
decision, ruling or finding, would materially and adversely affect the
condition, financial or otherwise, or the earnings, business affairs or business
prospects of the Depositor;

      (l) the issue and sale of the Certificates and the compliance by the
Depositor with all of the provisions of the Certificates, each Mortgage Loan
Purchase Agreement, this Agreement and the Pooling and Servicing Agreement, and
the execution and delivery by the Depositor of this Agreement, the Pooling and
Servicing Agreement and the Mortgage Loan Purchase Agreements are within the
corporate power of the Depositor and have been, or will have been, duly
authorized by all necessary corporate action on the part of the Depositor; and
neither the execution and delivery by the Depositor of such instruments, nor the
consummation by the Depositor of the transactions herein or therein
contemplated, nor the compliance by the Depositor with the provisions hereof or
thereof, will (A) conflict with or result in a breach of, or constitute a
default under, any of the provisions of the certificate of incorporation or
by-laws of the Depositor, (B) conflict with any of the provisions of any law,
governmental rule, regulation, judgment, decree or order binding on the
Depositor or its properties, (C) conflict with any of the provisions of any
indenture, mortgage, contract or other instrument to which the Depositor is a
party or by which it is bound or (D) except as contemplated by the Pooling and
Servicing Agreement, result in the creation or imposition of any lien, charge or
encumbrance upon any of its property or assets pursuant to the terms of any such
indenture, mortgage, contract or other instrument;

      (m) this Agreement has been duly authorized, executed and delivered by the
Depositor;

      (n) on the Specified Delivery Date, the Pooling and Servicing Agreement
and the Mortgage Loan Purchase Agreements will have been duly authorized,
executed and delivered by the Depositor and will be valid and binding agreements
of the Depositor, enforceable against the Depositor in accordance with their
respective terms, except to the extent that enforcement thereof may be limited
by (1) bankruptcy, insolvency, reorganization, moratorium or other similar laws
now or hereafter in effect relating to creditors' rights generally and (2)
general principles of equity (regardless of whether enforceability is considered
in a proceeding at law or in equity);

      (o) all approvals, authorizations, consents, orders or other actions of
any person, corporation or other organization, or of any court, governmental
agency or body or official (except with respect to the state securities or "blue
sky" laws of various jurisdictions) required in connection with the valid and
proper authorization, issuance and sale of the Certificates pursuant to this
Agreement and the Pooling and Servicing Agreement have been or will be taken or
obtained on or prior to the Specified Delivery Date;

      (p) at the Specified Delivery Date, each of the Mortgage Loans will meet
the criteria for selection described in the Prospectus Supplement;

      (q) neither the Depositor nor the Trust Fund is, and neither the sale of
the Certificates in the manner contemplated by the Prospectus nor the activities
of the Trust Fund pursuant to the Pooling and Servicing Agreement will cause the
Depositor or the Trust Fund to be an "investment company" or under the control
of an "investment company" as such terms are defined under the Investment
Company Act of 1940, as amended (the "Investment Company Act"), and the Pooling
and Servicing Agreement is not required to be qualified under the Trust
Indenture Act of 1939, as amended (the "Trust Indenture Act");

      (r) at the time of the execution and delivery of the Pooling and Servicing
Agreement, the Depositor (A) except as disclosed in the Prospectus, will convey
to the Trustee, or cause to be conveyed to the Trustee, all of the Depositor's
right, title and interest in and to the Mortgage Loans being transferred to the
Trustee pursuant to the Pooling and Servicing Agreement, free and clear of any
lien, mortgage, pledge, charge, encumbrance, adverse claim or other security
interest (collectively "Liens") granted by or imposed upon the Depositor, (B)
will not have assigned to any person any of its right, title or interest in the
Mortgage Loans or in the Pooling and Servicing Agreement or the Certificates,
and (C) will have the power and authority to transfer or cause to be transferred
the Mortgage Loans to the Trustee and to sell the Certificates to the
Underwriters. Upon execution and delivery of the Pooling and Servicing Agreement
by the Trustee, the Trustee will have acquired ownership of all of the
Depositor's right, title and interest in and to the Mortgage Loans except to the
extent disclosed in the Prospectus, and upon delivery to the Underwriters of the
Certificates pursuant hereto, each Underwriter will have good title to the
Certificates purchased by such Underwriter, in each case free of Liens granted
by or imposed upon the Depositor;

      (s) under generally accepted accounting principles and for federal income
tax purposes, the Depositor will report the transfer of the Mortgage Loans to
the Trustee in exchange for the Certificates and the sale of the Certificates to
the Underwriters pursuant to this Agreement as a sale of the interest in the
Mortgage Loans evidenced by the Certificates. The consideration received by the
Depositor upon the sale of the Certificates to the Underwriters will constitute
reasonably equivalent value and fair consideration for the Certificates. The
Depositor will be solvent at all relevant times prior to, and will not be
rendered insolvent by, the sale of the Certificates to the Underwriters. The
Depositor is not selling the Certificates to the Underwriters with any intent to
hinder, delay or defraud any of the creditors of the Depositor;

      (t) at the Specified Delivery Date, the respective Classes of Certificates
shall have been assigned ratings no lower than those set forth in Schedule I
hereto by the nationally recognized statistical rating organizations identified
in Schedule I hereto;

      (u) any taxes, fees and other governmental charges in connection with the
execution, delivery and issuance of this Agreement, the Pooling and Servicing
Agreement and the Certificates payable by the Depositor (other than income
taxes) have been paid or will be paid at or prior to the Specified Delivery
Date; and

      (v) the Depositor is not, and on the date on which the first bona fide
offer of the Certificates is made will not be, an "ineligible issuer," as
defined in Rule 405 under the 1933 Act.

      3. Purchase, Sale and Delivery of Certificates. Delivery of and payment
for the Certificates will be made at such place and at such time as shall be
specified in Schedule I or at such other time thereafter as set forth in
Schedule I or as you and the Depositor shall agree upon, each such time being
hereinafter referred to as a "Specified Delivery Date." Delivery of such
Certificates shall be made by the Depositor to the Underwriters against payment
of the purchase price specified in Schedule I in same day funds wired to such
bank as may be designated by the Depositor, or by such other manner of payment
as may be agreed upon by the Depositor and you. Unless otherwise provided for,
the Certificates to be so delivered will be in definitive, fully registered
form, in such denominations and registered in such names as you request, and
will be made available through the facilities of The Depository Trust Company,
or otherwise as you may request.

      4. Offering by Underwriters.

      (a) It is understood that the Underwriters propose to offer the
Certificates subject to this Agreement for sale to the public as set forth in
the Prospectus.

      (b) Each Underwriter represents, warrants and agrees that: (i) it has not
sold or offered the Certificates in the United Kingdom, and it has not delivered
or communicated the Prospectus or any other invitation or inducement to buy or
participate in the Certificates in the United Kingdom, except to persons who (A)
have professional experience of participating in unregulated collective
investment schemes and of matters relating to investments falling within both
Article 14(5) of the Financial Services and Markets Act 2000 (Promotion of
Collective Investment Schemes) (Exemptions) Order 2001 (the "CIS Order") and
Article 19(5) of the Financial Services and Markets Act (Financial Promotion)
Order 2001 (the "FP order") or (B) fall within Article 22(2)(a) through (d)
("high net worth companies, unincorporated associations, etc.") of the CIS Order
and Article 49(2)(a) though (d) of the FP Order; and (ii) it has complied and
will comply with all applicable provisions of the Financial Services and Markets
Act 2000 with respect to anything done by it in relation to the Certificates in,
from or otherwise involving the United Kingdom.

      5. Covenants of the Depositor. The Depositor covenants and agrees with you
that:

      (a) the Depositor has prepared and/or shall prepare a Prospectus
Supplement setting forth the amount of Certificates covered thereby and the
terms thereof not otherwise specified in the Base Prospectus, the price at which
such Certificates are to be purchased by the Underwriters from the Depositor,
either the initial public offering price or the method by which the price at
which such Certificates are to be sold will be determined, the selling
concessions and reallowances, if any, and such other information as you and the
Depositor deem appropriate in connection with the offering of such Certificates,
but the Depositor shall not file any amendments to the Registration Statement as
in effect with respect to the Certificates, or any amendments or supplements to
the Prospectus, unless it has first delivered copies of such amendments or
supplements to you and given you a reasonable opportunity to review the same or
if you have reasonably objected thereto promptly after receipt thereof; the
Depositor shall immediately advise you or your counsel (i) when notice is
received from the Commission that any post-effective amendment to the
Registration Statement has been filed or has become or will become effective or
any supplement to the Prospectus or any amended Prospectus, in each case
relating to the Certificates specified in Schedule I has been filed and will
furnish you with copies thereof, (ii) of any request by the Commission for any
amendment of the Registration Statement or the Prospectus or for any additional
information relating to the Certificates and (iii) of any order or communication
suspending or preventing, or threatening to suspend or prevent, the offer and
sale of the Certificates or of any proceedings or examinations that may lead to
such an order or communication, whether by or of the Commission or any authority
administering any state securities or "blue sky" law, as soon as the Depositor
is advised thereof, and shall use its best efforts to prevent the issuance of
any such order or communication and to obtain as soon as possible its lifting,
if issued;

      (b) if, at any time when the Prospectus is required to be delivered under
the 1933 Act, any event occurs as a result of which the Prospectus as then
amended or supplemented would include any untrue statement of a material fact or
omit to state any material fact necessary to make the statements therein, in
light of the circumstances under which they were made, not misleading, or if it
is necessary at any time to amend or supplement the Prospectus to comply with
the 1933 Act or the Rules and Regulations, the Depositor shall prepare and file
with the Commission, an amendment or supplement that will correct such statement
or omission or an amendment that will effect such compliance;

      (c) the Depositor shall make generally available to the holders of the
Certificates (the "Certificateholders"), in each case as soon as practicable,
earning statements covering (i) a period of 12 months beginning not later than
the first day of the related Trust's fiscal quarter next following the effective
date of the Registration Statement and (ii) a period of 12 months beginning no
later than the first day of the Trust's fiscal quarter next following the date
hereof which will satisfy the provisions of Section 11(a) of the 1933 Act and
Rule 158 of the Commission with respect to the Certificates. The Depositor shall
cause the Trustee to furnish or make available, within a reasonable time after
the end of each calendar year, to each holder of a Certificate at any time
during such year, such information as the Depositor deems necessary or desirable
to assist Certificateholders in preparing their federal income tax returns;

      (d) the Depositor shall furnish to you copies of the Registration
Statement, the Prospectus, and all amendments and supplements to such documents
relating to the Certificates, in each case as soon as available and in such
quantities as you reasonably request as long as the Depositor is required to
deliver the Prospectus under the 1933 Act in connection with the sale of the
Certificates; provided that any such documents requested by you on a date that
is more than nine (9) months after March 22, 2006 (the "Closing Date") shall be
provided at your expense;

      (e) the Depositor shall arrange for the qualification of the Certificates
for sale and the determination of their eligibility for investment under the
laws of such jurisdictions as you designate and shall continue such
qualifications in effect so long as required for the distribution; provided,
however, that neither the Depositor nor the Trust shall be required to qualify
to do business in any jurisdiction where it is now not qualified or to take any
action which would subject it to general or unlimited service of process in any
jurisdiction in which it is now not subject to service of process;

      (f) the Depositor shall, while the Certificates are outstanding;

            (i) furnish to you, as soon as available, copies of all reports
filed with the Commission and copies of each notice published or mailed to
holders of the Certificates pursuant to the Pooling and Servicing Agreement; and

            (ii) furnish to you such other information with respect to the Trust
or its financial condition or results of operations, as you may reasonably
request, including but not limited to information necessary or appropriate to
the maintenance of a secondary market in the Certificates; and

      (g) as between itself and the Underwriters, the Depositor will pay all
expenses incidental to the performance of its obligations under this Agreement,
including without limitation (i) expenses of preparing, printing and reproducing
the Prospectus (including any amendments thereof and supplements thereto), the
Pooling and Servicing Agreement and the Certificates, (ii) the fees charged by
Fitch Ratings, Inc, ("Fitch") and Standard & Poor's Ratings Services, a division
of The McGraw-Hill Companies, Inc. ("S&P" and together with Fitch, the "Rating
Agencies") for rating the Certificates, (iii) the fees and expenses of the
Trustee, and any agent of the Trustee and the fees and disbursements of counsel
for the Trustee in connection with the Pooling and Servicing Agreement and the
Certificates, and (iv) all other costs and expenses incidental to the
performance by the Depositor of its obligations hereunder that are not otherwise
specifically provided for in this subsection. It is understood that, except as
provided in this subsection (g) and in Section 10 below, each Underwriter will
pay all of its own expenses including all out-of-pocket and/or internally
allocated costs and expenses incurred by them in connection with the transaction
herein contemplated, including, without limitation, fees and expenses of their
counsel, any transfer taxes on the Certificates and the expenses of any
advertising of the offering of the Certificates made by the Underwriters; and

      (h) during the period when a prospectus is required by law to be delivered
in connection with the sale of the Certificates pursuant to this Agreement, the
Depositor shall file, or cause the Trustee to file on behalf of the Trust, on a
timely and complete basis, all documents that are required to be filed by the
related Trust with the Commission pursuant to Sections 13, 14 or 15(d) of the
Securities Exchange Act of 1934, as amended (the "Exchange Act").

      6. Conditions to the Obligations of the Underwriters. The obligations of
the Underwriters to purchase and pay for the Certificates subject to this
Agreement will be subject to the accuracy of the representations and warranties
on the part of the Depositor as of the date hereof and the Specified Delivery
Date, to the accuracy of the statements of the Depositor made pursuant to the
provisions hereof, to the performance by the Depositor in all material respects
of its obligations hereunder and to the following additional conditions
precedent:

      (a) you shall have received a letter from Ernst & Young LLP dated the date
hereof and, if requested by you, dated the Specified Delivery Date, each in the
forms heretofore agreed to;

      (b) all actions required to be taken and all filings required to be made
by the Depositor under the 1933 Act prior to the Specified Delivery Date shall
have been duly taken or made; and prior to the Specified Delivery Date, no stop
order suspending the effectiveness of the Registration Statement shall have been
issued and no proceedings for that purpose shall have been instituted, or to the
knowledge of the Depositor or any Underwriter, shall be contemplated by the
Commission;

      (c) unless otherwise specified in Schedule I, the Certificates subject to
this Agreement and offered by means of the Registration Statement shall be rated
the ratings specified in Schedule I, and shall not have been lowered or placed
on any credit watch with a negative implication for downgrade;

      (d) you shall have received an opinion of counsel to the guarantor, Credit
Suisse acting through Credit Suisse USA Inc. dated the Specified Delivery Date,
and in the form agreed to on or prior to such date;

      (e) you shall have received opinions of Cadwalader, Wickersham & Taft LLP,
special counsel to the Depositor and Credit Suisse Securities (USA) LLC, dated
the Specified Delivery Date, in substantially the form agreed to on or prior to
such date;

      (f) you shall have received an opinion of special counsel to each Mortgage
Loan Seller, dated the Specified Delivery Date, in the form agreed to on or
prior to such date;

      (g) you shall have received an opinion of counsel to the Trustee, dated
the Specified Delivery Date, which shall be dated the date of the Mortgage Loan
Purchase Agreements, in the form agreed to on or prior to such date, together
with a reliance letter addressed to the Rating Agencies, the Depositor and the
Trustee;

      (h) you shall have received an opinion of counsel of each Master Servicer,
dated the Specified Delivery Date, in the form agreed to on or prior to such
date;

      (i) you shall have received an opinion of counsel of each Special
Servicers, dated the Specified Delivery Date, in the form agreed to on or prior
to such date

      (j) you shall have received letters, dated the Specified Delivery Date,
from counsel rendering opinions to the Rating Agencies, to the effect that you
may rely upon their opinion to such Rating Agencies, as if such opinion were
rendered to you, or such opinions shall be addressed to you;

      (k) you shall have received a certificate or certificates signed by such
of the principal executive, financial and accounting officers of the Depositor
as you may request, dated the Specified Delivery Date, in the form agreed to on
or prior to such date;

      (l) you shall have received a certificate of the Trustee, signed by one or
more duly authorized officers of the Trustee, dated the Specified Delivery Date,
in the form agreed to on or prior to such date;

      (m) you shall have received a certificate of each Master Servicer, signed
by one or more duly authorized officers of such Master Servicer, dated the
Specified Delivery Date, in the form agreed to on or prior to such date;

      (n) you shall have received a certificate of each Special Servicer, signed
by one or more duly authorized officers of such Special Servicer, dated the
Specified Delivery Date, in the form agreed to on or prior to such date;

      (o) the Mortgage Loan Sellers shall have sold the Mortgage Loans to the
Depositor pursuant to the Mortgage Loan Purchase Agreements; and

      (p) you shall have received such other documents, certificates, letters
and opinions as you may reasonably request.

      7. Indemnification.

      (a) The Depositor shall indemnify and hold harmless each Underwriter, each
of its officers and each of its directors and each person, if any, that controls
any Underwriter within the meaning of the 1933 Act or the Exchange Act against
any expenses, losses, claims, damages or liabilities, joint or several, to which
such Underwriter or such officer, director or controlling person may become
subject under the 1933 Act, the Exchange Act or otherwise, and shall reimburse
any legal or other expenses reasonably incurred by such Underwriter or any such
director, officer, or controlling person in connection with investigating or
defending any such expense, loss, claim, damage, liability or action, in each
case insofar as such expenses, losses, claims, damages or liabilities (or
actions in respect thereof) arise out of or are based upon (i) any untrue
statement or alleged untrue statement of any material fact contained in the
Registration Statement or any amendment or supplement thereto or the omission or
alleged omission to state therein a material fact required to be stated therein
or necessary to make the statements therein not misleading, (ii) any untrue
statement or alleged untrue statement of any material fact contained in (x) any
Issuer Free Writing Prospectus or (y) any "Issuer Information," as defined in
Section 8(b) contained in (1) any Underwriter Free Writing Prospectus (as
defined in Section 8(b) hereof) prepared by or on behalf of such Underwriter, or
(2) any Free Writing Prospectus that is required to be filed pursuant to Section
8(e)(iii) or Section 8(h) hereof (clauses (x) and (y) collectively, the "Issuer
Disclosure Materials"), or the omission or alleged omission to state a material
fact required to make the statements therein (when read in connection with the
other Rule 159 Information), in light of the circumstances under which they were
made, not misleading, which error or omission was not corrected by information
subsequently supplied by the Depositor to such Underwriter within a reasonable
period of time prior to the Time of Sale or (iii) any breach of the
representation and warranty in Section 2(u). Notwithstanding the foregoing, (i)
the Depositor shall not be liable in any such case to the extent that any such
expense, loss, claim, damage or liability arises out of or is based upon any
such untrue statement or alleged untrue statement in, or omission or alleged
omission from, any such documents in reliance upon and in conformity with (A)
the Underwriter Information, (B) information regarding the Mortgage Loans that
is contained in the "Loan Detail" (as defined below) or, to the extent
consistent therewith, the Diskette; (C) information regarding any Mortgage Loan
Seller, the Mortgage Loans sold by such Mortgage Loan Seller to the Depositor or
the related mortgaged properties to the extent such information is covered by
the related Mortgage Loan Seller's Indemnification Agreement (the information in
clauses (B) and (C) referred to herein as the "Mortgage Loan Sellers'
Information"); or (D) information regarding the Trustee, the Master Servicers or
the Special Servicers contained in the Prospectus Supplement under the headings
"The Series 2006-C1 Pooling and Servicing Agreement--The Master Servicers,"
"--The Special Servicers," and "--The Trustee" and other sections but in each
only to the extent such information is covered by such party's indemnification
of the Underwriters and is actually indemnified by such party and (ii) such
indemnity with respect to an untrue statement or omission of a material fact
made in any Issuer Disclosure Materials that are part of the initial Rule 159
Information shall not inure to the benefit of any Underwriter if information
that corrected any untrue statement or omission of a material fact was furnished
to the Underwriters at a reasonable time prior to the Time of Sale. "Loan
Detail" shall mean the information set forth in Annex A-1 and Annex A-2 to the
Prospectus Supplement. "Diskette" shall mean the information set forth on the
diskette attached to the Prospectus Supplement.

      (b) The Depositor acknowledges that the following statements constitute
the only Underwriters' Information furnished in writing by or on behalf of the
Underwriters for inclusion in the Prospectus: the sixth paragraph on the cover
of the Prospectus Supplement; the sub-heading "--Underwriter" in the section of
the Prospectus Supplement entitled "Summary of Prospectus Supplement--Relevant
Parties/Entities"; and the first sentence of the fourth paragraph, and the
second sentence of the fifth paragraph under the heading "Underwriting" in the
Prospectus Supplement. This indemnity agreement shall be in addition to any
liability which the Depositor may otherwise have.

      (c) Each Underwriter shall severally, and not jointly, indemnify and hold
harmless the Depositor, each of its directors, each of its officers who has
signed the Registration Statement and each person, if any, who controls the
Depositor within the meaning of the 1933 Act or the Exchange Act against any
expenses, losses, claims, damages or liabilities to which the Depositor or any
such director, officer or controlling person may become subject under the 1933
Act, the Exchange Act or otherwise, and shall reimburse any legal or other
expenses reasonably incurred by the Depositor or any such director, officer or
controlling person in connection with investigating or defending any such
expense, loss, claim, damage, liability or action, in each case insofar as such
expenses, losses, claims, damages or liabilities (or actions in respect thereof)
arise out of or are based upon (i) any untrue statement or alleged untrue
statements of a material fact, or omissions or alleged omissions to state a
material fact required to be stated therein or necessary to make the statements
therein, in light of the circumstances under which they were made, not
misleading in the Underwriter Information and (ii) untrue statements or alleged
untrue statements of a material fact in any Underwriter Free Writing Prospectus
(as defined in Section 8(b)) or omission or alleged omission to state in such
Underwriter Free Writing Prospectus a material fact necessary in order to make
the statements therein (when read in conjunction with the Rule 159 Information),
in light of the circumstances under which they were made, not misleading; except
that, in the case of clause (ii), no Underwriter shall be obligated so to
indemnify and hold harmless the Depositor (x) for any losses, claims, damages or
liabilities caused by any untrue statement, alleged untrue statement, omission
or alleged omission (including those of a quantitative nature) resulting from an
error or omission in any Mortgage Loan Seller's Information (as defined in each
of the Indemnification Agreements) provided by a Mortgage Loan Seller or an
error or omission in any information provided by a Master Servicer, Special
Servicer or the Trustee and used for purposes of preparing such Free Writing
Prospectus, which Mortgage Loan Seller's Information or information provided by
a Master Servicer, Special Servicer or the Trustee was not corrected by
information subsequently supplied by the Depositor or any Mortgage Loan Seller
or the Master Servicer, Special Servicer or Trustee within a reasonable period
of time prior to the Time of Sale; (y) for any losses, claims, damages or
liabilities caused by any untrue statement, alleged untrue statement, omission
or alleged omission (including those of a quantitative nature) resulting from an
error or omission in the Issuer Information (as defined in Section 7(a) hereof)
supplied by the Depositor or any Mortgage Loan Seller to the Underwriter, which
Issuer Information was not corrected by information subsequently supplied by the
Depositor or any Mortgage Loan Seller within a reasonable period of time prior
to the Time of Sale; or (z) to the extent that the Depositor is entitled to
indemnification or contribution therefor from any Mortgage Loan Seller, Trustee,
Master Servicer or Special Servicer pursuant to any Indemnification Agreement.
Notwithstanding the foregoing, the indemnity provided in clause (ii) in the
immediately preceding sentence will apply only if such misstatement or omission
was not also a misstatement or omission in the Rule 159 Information. This
indemnity agreement shall be in addition to any liability that such Underwriter
may otherwise have.

      (d) Promptly after receipt by an indemnified party under this Section 7 of
notice of the commencement of any action, such indemnified party shall, if a
claim in respect thereof is to be made against the indemnifying party under this
Section 7, notify the indemnifying party of the commencement thereof; but the
omission to so notify the indemnifying party shall not relieve it from any
liability which it may have to any indemnified party under Section 7 (a) and
(c), except to the extent that such omission to notify materially prejudices the
indemnifying party or relieve it from any liability that it may have other than
under this Agreement. In case any such action is brought against any indemnified
party, after such indemnifying party has been notified of the commencement
thereof, such indemnifying party shall be entitled to participate therein (at
its own expense), and, to the extent that it may wish, shall be entitled to
assume the defense thereof (jointly with any other indemnifying party similarly
notified) with counsel reasonably satisfactory to such indemnified party (which
shall not, except with the consent of the indemnified party, be counsel to the
indemnifying party), and after notice from the indemnifying party to such
indemnified party of its election to so assume the defense thereof, the
indemnifying party shall not be liable to such indemnified party under this
Section 7 for any legal or other expenses subsequently incurred by such
indemnified party in connection with the defense thereof other than reasonable
costs of investigation. In any such proceeding, any indemnified party shall have
the right to retain its own counsel, but the fees and expenses of such counsel
shall be at the expense of such indemnified party unless (i) the indemnifying
party and the indemnified party shall have agreed to the retention of such
counsel, (ii) the named parties to any such proceeding (including any impleaded
parties) include both the indemnifying party and the indemnified party and
representation of both parties by the same counsel would be inappropriate due to
actual or potential differing interests between them or (iii) the indemnifying
party shall have failed to designate within a reasonable period of time counsel
reasonably satisfactory to the indemnified party (in which case the fees and
expenses shall be paid by the indemnifying party as incurred by the indemnified
party). In no event shall the indemnifying parties be liable for fees and
expenses of more than one counsel (in addition to any local counsel) separate
from their own counsel for all indemnified parties in connection with any one
action or separate but similar or related actions in the same jurisdiction
arising out of the same general allegations or circumstances. An indemnifying
party shall not be liable for any settlement of any proceeding effected without
its written consent. However, if settled with such consent or if there be a
final judgment for the plaintiff, the indemnifying party shall indemnify the
indemnified party from and against any loss or liability by reason of such
settlement or judgment. If an indemnifying party assumes the defense of any
proceeding, it shall be entitled to settle such proceeding with the consent of
the indemnified party or, if such settlement (i) provides for an unconditional
release of the indemnified party in connection with all matters relating to the
proceeding that have been asserted against the indemnified party in such
proceeding by the other parties to such settlement and (ii) does not require an
admission of fault by the indemnified party, without the consent of the
indemnified party.

      (e) If recovery is not available under the foregoing indemnification
provisions of this Section 7 or is insufficient in respect of any liabilities
referred to therein (on grounds of public policy or otherwise), the parties
entitled to indemnification by the terms thereof shall be entitled to
contribution to liabilities and expenses, except to the extent that contribution
is not permitted under Section 11(f) of the 1933 Act. In determining the amount
of contribution to which the respective parties are entitled, there shall be
considered the relative benefits received by the Depositor on the one hand and
each Underwriter on the other from the offering of the Certificates subject to
this Agreement (taking into account the portion of the proceeds of the offering
realized by each). In the event contribution according to the foregoing sentence
is not permitted by law, in determining the amount of contribution to which the
respective parties are entitled, there shall be considered not only the relative
benefits received by the Depositor on the one hand and such Underwriter on the
other from the offering of the Certificates but also the parties' relative
knowledge and access to information concerning the matter with respect to which
the claim was asserted, the opportunity to correct and prevent any statement or
omission and any other equitable considerations appropriate under the
circumstances. The Depositor and the Underwriters agree that it would not be
equitable if the amount of such contribution were determined by pro rata or per
capita allocation (even if the Underwriters were treated as one entity for such
purpose). Notwithstanding the provisions of this subsection (e), no Underwriter
shall be required to contribute any amount in excess of the amount by which the
total underwriting discounts and commissions and other fees received by such
Underwriter in connection with the offering of the Certificates exceeds the
amount of damages that such Underwriter has otherwise been required to pay by
reason of such untrue or alleged untrue statement or omission or alleged
omission. The obligations of the Underwriters in this subsection (e) to
contribute are several in proportion to their respective underwriting
obligations and not joint.

      (f) The amount paid or payable by an indemnified party as a result of the
losses, claims, damages or other liabilities referred to in this Section 7 shall
be deemed to include any legal fees and disbursements or other expenses
reasonably incurred by such indemnified party in connection with investigating
or defending any such claim. In the event that any expenses so paid by the
indemnifying party are subsequently determined to not be required to be borne by
the indemnifying party hereunder, the party which received such payment shall
promptly refund the amount so paid to the party which made such payment. No
person guilty of fraudulent misrepresentation (within the meaning of Section
11(f) of the 1933 Act) shall be entitled to contribution from any person who was
not guilty of such fraudulent misrepresentation. The remedies provided for in
this Section 7 are not exclusive and shall not limit any rights or remedies that
may otherwise be available to any indemnified party at law or in equity.

      (g) The indemnity and contribution agreements contained in this Section 7
shall remain operative and in full force and effect regardless of (i) any
termination of this Agreement, (ii) any investigation made by the Depositor, any
Underwriter, any of their respective directors or officers, or any person
controlling the Depositor or such Underwriter, and (iii) acceptance of and
payment for any of the Certificates.

      (h) The obligations of the Depositor under this Section 7 shall be in
addition to any liability which the Depositor may otherwise have and shall
extend, upon the same terms and conditions, to each officer and director of any
Underwriter and to each person, if any, who controls any Underwriter within the
meaning of the 1933 Act or the Exchange Act; and the obligations of the
Underwriters under this Section 7 shall be in addition to any liability which
the respective Underwriters may otherwise have and shall extend, upon the same
terms and conditions, to each officer and director of the Depositor and to each
person, if any, who controls the Depositor within the meaning of the 1933 Act or
Exchange Act.

      (i) Each Underwriter will indemnify and hold harmless the other
Underwriters and each person, if any, who controls such Underwriters within the
meaning of either the 1933 Act or the Exchange Act (the "Non-Indemnifying
Underwriters") from and against any and all expenses, losses, claims, damages or
liabilities, joint or several, to which the Non-Indemnifying Underwriters
becomes subject under the 1933 Act, the Exchange Act or other federal or state
statutory law or regulation, common law or otherwise, insofar as such expenses,
losses, claims, damages or liabilities (or actions in respect thereof) arise out
of or are based upon (i) any untrue statement or alleged untrue statement of a
material fact or the omission or alleged omission (when read in conjunction with
the Rule 159 Information) to state a material fact necessary in order to make
the statements, in light of the circumstances under which they were made, not
misleading at the Time of Sale, contained in any Underwriter Free Writing
Prospectus prepared by or on behalf of, or used or referred to by, such
indemnifying Underwriter or (ii) the failure of such indemnifying Underwriter,
or any member of its selling group to comply with any provision of Section 8
hereof. In addition, each Underwriter agrees to reimburse, as incurred, such
Non-Indemnifying Underwriters for any legal or other expenses reasonably
incurred by them in connection with investigating or defending against any such
loss, claim, damage, liability or action, except to the extent that the
Non-Indemnifying Underwriters are entitled to indemnification or contribution
therefor from any Mortgage Loan Seller pursuant to any Indemnification
Agreement. This agreement will be in addition to any liability that any
Underwriter may otherwise have.

      8. Offering Communications; Free Writing Prospectuses.

      (a) Unless preceded or accompanied by a prospectus satisfying the
requirements of Section 10(a) of the 1933 Act, no Underwriter shall convey or
deliver any written communication to any person in connection with the initial
offering of the Certificates, unless such written communication (i) is made in
reliance on Rule 134 under the 1933 Act, (ii) constitutes a prospectus
satisfying the requirements of Rule 430B under the 1933 Act or (iii) constitutes
Rule 159 Information or a Free Writing Prospectus. Without limitation thereby,
without the prior written consent of the Depositor (which consent may be
withheld for any reason), no Underwriter shall prepare, convey or deliver in
connection with the initial offering of the Certificates any Free Writing
Prospectus or "ABS informational and computational material," as defined in Item
1101(a) of Regulation AB under the 1933 Act ("ABS Informational and
Computational Material"), in reliance upon Rules 167 and 426 under the 1933 Act
other than materials provided to it by Credit Suisse Securities (USA) LLC or the
Depositor.

      (b) Each Underwriter shall deliver to the Depositor, no later than two
business days prior to the date of first use thereof or such later date as may
be agreed to by the Depositor, (i) any Free Writing Prospectus that was prepared
by or on behalf of such Underwriter (an "Underwriter Free Writing Prospectus")
and that contains any "issuer information," as defined in Rule 433(h) under the
1933 Act and footnote 271 of the Commission's Securities Offering Reform Release
No. 33-8591 ("Issuer Information") (which the parties hereto agree includes,
without limitation, Mortgage Loan Seller Information), and (ii) any Free Writing
Prospectus or portion thereof prepared by or on behalf of such Underwriter that
contains only a description of the final terms of the Certificates.
Notwithstanding the foregoing, any Free Writing Prospectus that contains only
ABS Informational and Computational Materials may be delivered by an Underwriter
to the Depositor not later than the later of (A) two business days prior to the
due date for filing of the Prospectus pursuant to Rule 424(b) under the 1933 Act
or such later date as may be agreed to by the Depositor or (B) the date of first
use of such Free Writing Prospectus.

      (c) Each Underwriter represents and warrants to the Depositor that the
Free Writing Prospectuses to be furnished to the Depositor by such Underwriter
pursuant to Section 8(b) hereof will constitute all Free Writing Prospectuses of
the type described therein that were furnished to prospective investors by such
Underwriter in connection with its offer and sale of the Certificates.

      (d) Each Underwriter represents and warrants to the Depositor that each
Free Writing Prospectus required to be provided by it to the Depositor pursuant
to Section 8(b) hereof did not, as of the date such Free Writing Prospectus was
conveyed or delivered to any prospective investor, include any untrue statement
of a material fact or omit to state any material fact required to be stated
therein or necessary to make the statements contained therein (when read in
conjunction with the Rule 159 Information), in light of the circumstances under
which they were made, not misleading; provided however, that no Underwriter
makes any representation to the extent such misstatements or omissions were the
result of any inaccurate Issuer Information supplied by the Depositor or any
Mortgage Loan Seller to such Underwriter, which information was not corrected by
information subsequently supplied by the Depositor or any Mortgage Loan Seller
to such Underwriter within a reasonable period of time prior to the Time of
Sale.

      (e) The Depositor agrees to file with the Commission the following:

            (i) Any Issuer Free Writing Prospectus;

            (ii) Any Free Writing Prospectus or portion thereof delivered by an
Underwriter to the Depositor pursuant to Section 8(b) hereof; and

            (iii) Any Free Writing Prospectus for which the Depositor or any
person acting on its behalf provided, authorized or approved information that is
prepared and published or disseminated by a person unaffiliated with the
Depositor or any other offering participant that is in the business of
publishing, radio or television broadcasting or otherwise disseminating
communications.

      Notwithstanding the foregoing, the Depositor shall not be required to file
(1) Issuer Information contained in any Underwriter Free Writing Prospectus or
Free Writing Prospectus of any other offering participant other than the
Depositor, if such information is included or incorporated by reference in a
prospectus or Free Writing Prospectus previously filed with the Commission that
relates to the offering of the Certificates, or (2) any Free Writing Prospectus
or portion thereof that contains a description of the Certificates or the
offering of the Certificates which does not reflect the final terms thereof.

      (f) Any Free Writing Prospectus required to be filed pursuant to Section
8(e) hereof by the Depositor shall be filed with the Commission not later than
the date of first use of the Free Writing Prospectus, except that:

            (i) any Free Writing Prospectus or portion thereof required to be
filed that contains only the description of the final terms of the Certificates
may be filed by the Depositor within two (2) days of the later of the date such
final terms have been established for all classes of Certificates and the date
of first use;

            (ii) any Free Writing Prospectus or portion thereof required to be
filed that contains only ABS Informational and Computational Material may be
filed by the Depositor with the Commission not later than the later of the due
date for filing the final Prospectus relating to the Certificates pursuant to
Rule 424(b) under the 1933 Act or two (2) business days after the first use of
such Free Writing Prospectus;

            (iii) any Free Writing Prospectus required to be filed pursuant to
Section 8(e)(iii) hereof may, if no payment has been made or consideration has
been given by or on behalf of the Depositor for the Free Writing Prospectus or
its dissemination, be filed by the Depositor with the Commission not later than
four (4) business days after the Depositor becomes aware of the publication,
radio or television broadcast or other dissemination of the Free Writing
Prospectus; and

            (iv) the Depositor shall not be required to file (A) Issuer
Information contained in any Free Writing Prospectus of an Underwriter or any
offering participant other than the Depositor, if such information is included
or incorporated by reference in a prospectus or Free Writing Prospectus
previously filed with the Commission that relates to the offering of the
Certificates, or (B) any Free Writing Prospectus or portion thereof that
contains a description of the Certificates or the offering of the Certificates
which does not reflect the final terms thereof.

      (g) Each Underwriter shall file with the Commission, or provide to the
Depositor at least two business days prior to the time such filing is required,
any Free Writing Prospectus that is used or referred to by it and distributed by
or on behalf of such Underwriter which is neither an Issuer Free Writing
Prospectus nor contains Issuer Information in a manner reasonably designed to
lead to its broad, unrestricted dissemination not later than the date of the
first use of such Free Writing Prospectus.

      (h) Notwithstanding the provisions of Section 8(g) hereof, each
Underwriter shall file with the Commission any Free Writing Prospectus for which
such Underwriter or any person acting on its behalf provided, authorized or
approved information that is prepared and published or disseminated by a person
unaffiliated with the Depositor or any other offering participant that is in the
business of publishing, radio or television broadcasting or otherwise
disseminating written communications and for which no payment was made or
consideration given by or on behalf of the Depositor or any other offering
participant, not later than four (4) business days after the Underwriter becomes
aware of the publication, radio or television broadcast or other dissemination
of the Free Writing Prospectus.

      (i) Notwithstanding the provisions of Sections 8(e) and 8(g) hereof,
neither the Depositor nor any Underwriter shall be required to file any Free
Writing Prospectus that does not contain substantive changes from or additions
to a Free Writing Prospectus previously filed with the Commission.

      (j) The Depositor and the Underwriters each agree that any Free Writing
Prospectuses prepared by it shall contain the following legend, or substantially
equivalent legend that complies with Rule 433 of the 1933 Act:

      "We have filed a registration statement (including a prospectus) with the
Securities and Exchange Commission for the offering to which this communication
relates. Before you invest, you should read the prospectus in the registration
statement and other documents the depositor has filed with the Securities and
Exchange Commission for more complete information about us, the issuing trust
and this offering. You may get these documents for free by visiting EDGAR on the
Securities and Exchange Commission web site at www.sec.gov. Alternatively, the
depositor, any underwriter or any dealer participating in the offering will
arrange to send you the prospectus after filing if you request it by calling
toll free 1.800.221.1037 or by email to the following address:
barry.polen@csfb.com."

      (k) The Depositor and the Underwriters each agree to retain all Free
Writing Prospectuses that they have used and that are not required to be filed
pursuant to this Section 8 for a period of three (3) years following the initial
bona fide offering of the Certificates.

      (l) (i) In the event that the Depositor becomes aware that, as of the Time
of Sale, any Issuer Free Writing Prospectus contains any untrue statement of a
material fact or omits to state a material fact necessary in order to make the
statements contained therein (when read in conjunction with the Rule 159
Information), in light of the circumstances under which they were made, not
misleading (a "Defective Issuer Free Writing Prospectus"), the Depositor shall
notify the Underwriters of such untrue statement or omission within one business
day after discovery and the Depositor shall, if requested by the Underwriters,
prepare and deliver to the Underwriters a Free Writing Prospectus that corrects
the material misstatement or omission in the Defective Issuer Free Writing
Prospectus (such corrected Issuer Free Writing Prospectus, a "Corrected Issuer
Free Writing Prospectus").

            (ii) In the event that any Underwriter becomes aware that, as of the
      Time of Sale, any Underwriter Free Writing Prospectus delivered to an
      investor in any Certificates contained any untrue statement of a material
      fact or omitted to state a material fact necessary in order to make the
      statements contained therein (when read in conjunction with the Rule 159
      Information), in light of the circumstances under which they were made,
      not misleading (together with a Defective Issuer Free Writing Prospectus,
      a "Defective Free Writing Prospectus"), such Underwriter shall notify the
      Depositor of such untrue statement or omission within one business day
      after discovery.

            (iii) The Underwriters shall, if requested by the Depositor:

      (a) if the Defective Free Writing Prospectus was an Underwriter Free
Writing Prospectus, prepare a Free Writing Prospectus that corrects the material
misstatement in or omission from the Defective Free Writing Prospectus (together
with a Corrected Issuer Free Writing Prospectus, a "Corrected Free Writing
Prospectus");

      (b) deliver the Corrected Free Writing Prospectus to each investor which
received the Defective Free Writing Prospectus prior to entering into a contract
of sale with such investor;

      (c) notify such investor in a prominent fashion that the prior contract of
sale with the investor has been terminated, and of the investor's rights as a
result of termination of such agreement;

      (d) provide such investor with an opportunity to affirmatively agree to
purchase the Certificates on the terms described in the Corrected Free Writing
Prospectus; and

      (e) comply with any other requirements for reformation of the original
contract of sale with such investor, as described in Section IV.A.2.c of
Commission's Securities Offering Reform Release No. 33-8591.

            (iv) In the event that the Defective Free Writing Prospectus was an
      Issuer Free Writing Prospectus, and the Underwriters shall in good faith
      incur any costs to an investor in connection with the reformation of the
      contract of sale with the investor, the Depositor agrees to reimburse the
      Underwriters for such costs; provided that, before incurring such costs,
      the Underwriters first permits the Depositor access to the applicable
      investor and an opportunity to attempt to mitigate such costs through
      direct negotiation with such investor.

            (iv) Each Underwriter covenants with the Depositor that after the
      final Prospectus is available the Underwriter shall not distribute any
      written information concerning the Certificates to a prospective investor
      unless such information is preceded or accompanied by the final
      Prospectus..

      (m) Each Underwriter covenants with the Depositor that it will make
available to the Depositor such personnel as are familiar with the Underwriter's
compliance procedures for the purpose of answering questions concerning the
Underwriter's practices and procedures for the preparation and dissemination of
written materials concerning the Certificates to prospective investors prior to
the delivery of the final Prospectus to such investors.

      9. Default of Underwriters. If any Underwriter defaults in its obligations
to purchase Certificates hereunder and the aggregate principal amount of
Certificates that such defaulting Underwriter or Underwriters agreed but failed
to purchase does not exceed 10% of the total principal amount of Certificates to
be purchased hereunder, Credit Suisse Securities (USA) LLC may make arrangements
satisfactory to the Depositor for the purchase of such Certificates by other
persons, but if no such arrangements are made by such Closing Date, the
non-defaulting Underwriters shall be obligated to purchase the Certificates that
such defaulting Underwriter agreed but failed to purchase hereunder. If any
Underwriter so defaults and the aggregate principal amount of Certificates with
respect to which such default occurs exceeds 10% of the total principal amount
of Certificates to be purchased hereunder and arrangements satisfactory to
Credit Suisse Securities (USA) LLC and the Depositor for the purchase of such
Certificates by other persons are not made within 36 hours after such default,
this Agreement will terminate without liability on the part of any
non-defaulting Underwriter or the Depositor, except as provided in Section 10.
As used in this Agreement, the term "Underwriter" includes any person
substituted for an Underwriter under this Section. Nothing herein will relieve a
defaulting Underwriter from liability for its default.

      10. Termination of the Obligations of the Underwriters. (a) Any
Underwriter may terminate its obligations under this Agreement by notice to the
Depositor at any time at or prior to the Specified Delivery Date if the sale of
the Certificates provided for herein is not consummated because of any failure
or refusal on the part of the Depositor to comply with the terms or to fulfill
any of the conditions of this Agreement, or if for any reason the Depositor
shall be unable to perform its obligations under this Agreement.

      (b) The obligations of the Underwriters to purchase on the Specified
Delivery Date the Certificates described in Schedule I shall be terminable by
Credit Suisse Securities (USA) LLC if at any time on or prior to the Specified
Delivery Date (i) any change, or any development or event involving a
prospective change in the condition (financial or other), business, properties
or results of operations of the Depositor or the Trust which, in the judgment of
a majority in interest of the Underwriters (based on Underwriting obligations)
including Credit Suisse Securities (USA) LLC is material and adverse and makes
it impractical or inadvisable to proceed with completion of the public offering
or the sale of and payment for the Certificates; (ii) any downgrading in the
rating of any of the Certificates by any "nationally recognized statistical
rating organization" (as defined for purposes of Rule 436(g) under the 1933
Act), or any public announcement that any such organization has under
surveillance or review its rating of any of the Certificates (other than an
announcement with positive implications of a possible upgrading, and no
implication of a possible downgrading, of such rating); (iii) any change in U.S.
or international financial, political or economic conditions or currency
exchange rates or exchange controls as would, in the judgment of a majority in
interest of the Underwriters including Credit Suisse Securities (USA) LLC be
likely to prejudice materially the success of the proposed issue, sale or
distribution of the Certificates, whether in the primary market or in respect of
dealings in the secondary market; (iv) any material suspension or material
limitation of trading in securities generally on the New York Stock Exchange or
any setting of minimum prices for trading on such exchange, or any suspension of
trading of any Certificates on any relevant exchange or in the over-the-counter
market; (v) any general moratorium on commercial banking activities declared by
any Federal or New York State authorities; (vi) any major disruption of
settlements of securities or clearance services in the United States; or (vii)
any attack on, outbreak or escalation of hostilities or act of terrorism
involving the United States, any declaration of war by Congress or any other
national or international calamity or emergency if, in the judgment of a
majority in interest of the Underwriters including Credit Suisse Securities
(USA) LLC the effect of any such attack, outbreak, escalation, act, declaration,
calamity or emergency makes it impractical or inadvisable to proceed with
completion of the public offering or the sale of any payment for the
Certificates.

      (c) If any Underwriter terminates its obligations under this Agreement in
accordance with Section 10(a), the Depositor shall reimburse such Underwriter
for all reasonable out-of pocket expenses (including reasonable fees and
disbursements of counsel) that shall have been reasonably incurred by such
Underwriter in connection with the proposed purchase and sale of the
Certificates.

      11. Survival of Certain Representations and Obligations. The respective
indemnities, agreements, representations, warranties and other statements by the
Depositor and of the several Underwriters set forth in or made pursuant to this
Agreement shall remain in full force and effect, regardless of any investigation
or statement as to the results thereof made by or on behalf of such
Underwriters, the Depositor or any of their respective officers or directors or
any controlling person, and shall survive delivery of and payment of the related
Certificates.

      If this Agreement is terminated pursuant to Section 10 above or if for any
reason the purchase by the Underwriters of the Certificates described in
Schedule I is not consummated, the Depositor shall remain responsible for the
expenses to be paid or reimbursed by it pursuant to Section 5(g) above, and the
obligations of the Depositor and such Underwriters pursuant to Section 7 above
shall remain in effect.

      12. Obligations of Column Financial, Inc. Column Financial, Inc. agrees
with the Underwriters, for the sole and exclusive benefit of the Underwriters
and each of their respective officers, directors and any other person, if any,
who controls the Underwriters within the meaning of the 1933 Act or the Exchange
Act and not for the benefit of any assignee thereof or any other person or
persons dealing with the Underwriters, to indemnify and hold harmless the
Underwriters against any failure by the Depositor to perform its obligations to
the Underwriters and their officers, directors and control persons pursuant to
Section 7(a) hereof.

      13. Notices. All communications hereunder shall be in writing and, if sent
to Credit Suisse First Boston LLC, shall be mailed, delivered or telecopied to
it at Credit Suisse First Boston LLC, Eleven Madison Avenue, New York, New York
10010, Attention: Edmund Taylor, with a copy to Casey McCutcheon, Esq., Legal &
Compliance Department, Telecopy No.: (917) 326-8433; if sent to McDonald
Investments Inc., shall be mailed, delivered or telecopied to it at McDonald
Investments Inc., 127 Public Square, Cleveland, Ohio 44114, Attention: Joe
Chinnici, Telecopy No.: (216) 689-4233 (with a copy to Richard Hawrylak,
Telecopy No.: (216) 689-5681); if sent to GMAC Commercial Holding Capital
Markets Corp., shall be mailed, delivered or telecopied to it at GMAC Commercial
Holding Capital Markets Corp., 200 Witmer Road, Horsham, Pennsylvania 19044,
Attention: David M. Lazarus, Telecopy No.: (215) 328-1775; if sent to Banc of
America Securities LLC shall be mailed, delivered or telecopied to it at Banc of
America Securities LLC, 214 North Tryon Street, NC1-027-22-03, Charlotte, North
Carolina 28255, Attention: Stephen Hogue, Telecopy No.: (704) 386-1094, with a
copy to Paul Kurzeja, Esq., Legal Department, Telecopy No.: (704) 409-0267; or
if sent to the Depositor, shall be mailed, delivered or telecopied to it at
Credit Suisse First Boston Mortgage Securities Corp., Eleven Madison Avenue, New
York, New York 10010, Attention: Edmund Taylor, with a copy to Casey McCutcheon,
Esq., Legal & Compliance Department, Telecopy No.: (917) 326-8433; provided,
however, that any notice to an Underwriter pursuant to Section 7 shall be
mailed, delivered or telecopied to such Underwriter at the address furnished by
it.

      14. No Fiduciary Duty. The Depositor acknowledges and agrees that the
Underwriters are acting solely in the capacity of an arm's length contractual
counterparty to the Depositor with respect to the offering of the Certificates
contemplated hereby (including in connection with determining the terms of the
offering) and not as a financial advisor or a fiduciary to, or an agent of, the
Depositor or any other person. Additionally, neither Credit Suisse nor any other
Underwriter is advising the Depositor or any other person as to any legal, tax,
investment, accounting or regulatory matters in any jurisdiction. The Depositor
shall consult with its own advisors concerning such matters and shall be
responsible for making their own independent investigation and appraisal of the
transactions contemplated hereby, and the Underwriters shall have no
responsibility or liability to the Depositor with respect thereto. Any review by
the Underwriters of the Depositor, the transactions contemplated hereby or other
matters relating to such transactions will be performed solely for the benefit
of the Underwriters and shall not be on behalf of the Depositor.

      15. Successors. This Agreement shall inure to the benefit of and be
binding upon the parties hereto and their respective successors and the
officers, directors and controlling persons referred to in Section 7 above, and
their successors and assigns, and no other person shall have any right or
obligation hereunder. No purchaser of any Certificates from any Underwriter
shall be deemed a successor or assign by reason merely of such purchase.

      16. APPLICABLE LAW. THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

      17. Counterparts. This Agreement may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute one and the same Agreement.

      If the foregoing is in accordance with your understanding of our
agreement, please sign and return to us a counterpart hereof, whereupon it will
become a binding agreement among the Depositor and the several Underwriters in
accordance with its terms. Alternatively, the execution of this Agreement by the
Depositor and its acceptance by or on behalf of the Underwriters may be
evidenced by an exchange of telegraphic or other written communications.

                                                     Very truly yours,

                     [SIGNATURES COMMENCE ON FOLLOWING PAGE]

<PAGE>

                                         CREDIT SUISSE FIRST BOSTON MORTGAGE
                                                SECURITIES CORP.,

                                                as Depositor

                                         By: ___________________________________
                                             Name:
                                             Title

The foregoing Agreement is hereby confirmed and accepted as of the date first
above written.

CREDIT SUISSE SECURITIES (USA) LLC,
     as Underwriter

By:___________________________________________
Name:
Title:

GMAC COMMERCIAL HOLDING CAPITAL MARKETS CORP.,
     as Underwriter

By:___________________________________________
Name:
Title:

                     [SIGNATURES CONTINUE ON FOLLOWING PAGE]

<PAGE>

MCDONALD INVESTMENTS INC.,
     as Underwriter

By:  _________________________________________
     Name:
     Title:

BANC OF AMERICA SECURITIES LLC,
     as Underwriter

By:___________________________________________
Name:
Title:

Acknowledged and agreed solely as to Section 12:

COLUMN FINANCIAL, INC.

By:  _________________________________________
     Name:
     Title:

<PAGE>

                                   SCHEDULE I

Prospectus: Prospectus Supplement dated March 7, 2006 and Base Prospectus dated
March 7, 2006 (Registration Statement No.: 333-129918)

Aggregate Principal Amount of Offered Certificates: $2,785,803,000 (approximate)

Aggregate Purchase Price to be Paid by Credit Suisse Securities (USA) LLC:
$2,785,803,000 plus accrued interest

Aggregate Purchase Price to be Paid by GMAC Commercial Holding Capital Markets
Corp.: $0 plus accrued interest

Aggregate Purchase Price to be Paid by Banc of America Securities LLC: $0 plus
accrued interest

Aggregate Purchase Price to be Paid by McDonald Investments Inc.: $0 plus
accrued interest

Certificate Balances/Notional Balance:

            Class A-1      $101,000,000
            Class A-2      $235,000,000
            Class A-3      $336,916,000
           Class A-AB      $155,000,000
            Class A-4      $698,000,000
           Class A-1-A     $576,577,000
            Class A-M      $300,356,000
            Class A-J      $236,531,000
            Class B         $18,772,000
            Class C         $37,545,000
            Class D         $33,790,000
            Class E         $22,526,000
            Class F         $33,790,000

Ratings (S&P/Fitch):
                  Class A-1          AAA/AAA
                  Class A-2          AAA/AAA
                  Class A-3          AAA/AAA
                  Class A-AB         AAA/AAA
                  Class A-4          AAA/AAA
                 Class A-1-A         AAA/AAA
                  Class A-M          AAA/AAA
                  Class A-J          AAA/AAA
                   Class B           AA+/AA+
                   Class C           AA/AA
                   Class D           AA-/AA-
                   Class E           A+/A+
                   Class F           A/A
Pass-Through Rates:
                  Class A-1          4.3670%
                  Class A-2          5.5120%
                  Class A-3          5.7110%
                  Class A-AB         5.6810%
                  Class A-4          5.6090%
                 Class A-1-A         5.6110%
                  Class A-M          5.7375%
                  Class A-J          5.7375%
                   Class B           5.7375%
                   Class C           5.7375%
                   Class D           5.7375%
                   Class E           5.7375%
                   Class F           5.7375%

<PAGE>

                                                Certificates Purchased

                                                 Certificate Balances
<TABLE>
<CAPTION>

                                               Class A-1           Class A-2           Class A-3           Class A-AB
                                              Certificate         Certificate         Certificate         Certificate
               Underwriter                      Balance             Balance             Balance             Balance
               -----------                      -------             -------             -------             -------
<S>                                           <C>                 <C>                 <C>                 <C>
Credit Suisse Securities (USA) LLC            $101,000,000        $235,000,000        $336,916,000        $155,000,000
GMAC Commercial Holding Capital Markets
Corp.                                              $0                  $0                  $0                  $0
McDonald Investments Inc.                          $0                  $0                  $0                  $0
Banc of America Securities LLC                     $0                  $0                  $0                  $0

         Total                                $101,000,000       $235,000,000]        $336,916,000        $155,000,000
</TABLE>

<TABLE>
<CAPTION>
                                               Class A-4          Class A-1-A          Class A-M           Class A-J
                                              Certificate         Certificate         Certificate         Certificate
               Underwriter                      Balance             Balance             Balance             Balance
               -----------                      -------             -------             -------             -------
<S>                                           <C>                 <C>                 <C>                 <C>
Credit Suisse Securities (USA) LLC            $698,000,000        $576,577,000        $300,356,000        $236,531,000
GMAC Commercial Holding Capital Markets
Corp.                                              $0                  $0                  $0                  $0
McDonald Investments Inc.                          $0                  $0                  $0                  $0
Banc of America Securities LLC                     $0                  $0                  $0                  $0

         Total                                $698,000,000        $576,577,000        $300,356,000        $236,531,000
</TABLE>

<TABLE>
<CAPTION>
                                        Class B            Class C           Class D           Class E           Class F
                                      Certificate        Certificate       Certificate       Certificate       Certificate
           Underwriter                  Balance            Balance           Balance           Balance           Balance
           -----------                  -------            -------           -------           -------           -------
<S>                                   <C>                <C>               <C>               <C>               <C>
Credit Suisse Securities (USA) LLC    $18,772,000        $37,545,000       $33,790,000       $22,526,000       $33,790,000
GMAC Commercial Holding Capital
Markets Corp.                              $0                $0                 $0               $0                $0
McDonald Investments Inc.                  $0                $0                 $0               $0                $0
Banc of America Securities LLC             $0                $0                 $0               $0                $0

         Total                        $18,772,000        $37,545,000       $33,790,000       $22,526,000       $33,790,000
</TABLE>

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00101-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00101-of-00352.parquet"}]]