Underwriting Agreement (2007)Full Document 

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              CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
                                    Depositor

          Commercial Mortgage Pass-Through Certificates, Series 2007-C2

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


                                                          April 27, 2007


CREDIT SUISSE SECURITIES  LLC
Eleven Madison Avenue
New York, New York  10010

CALIFORNIA FINA GROUP, INC.
(DBA: FINACORP SECURITIES)
2302 Martin Street, Suite 225
Irvine, California 92612

KEYBANC CAPITAL MARKETS INC.
Key Tower
127 Public Square
Cleveland, Ohio  44114

GREENWICH CAPITAL MARKETS, INC.
600 Steamboat Road
Greenwich, Connecticut  06830-7168

WACHOVIA CAPITAL MARKETS, LLC
301 South College Street
One Wachovia Center
Charlotte, North Carolina  28288

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 certain
securities entitled Credit Suisse First Boston Mortgage Securities Corp.
Commercial Mortgage Pass-Through Certificates, Series 2007-C2 and including the
classes thereof specified on Schedule I hereto (the classes of such securities
so specified on Schedule I hereto, the "Certificates"). 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 207 fixed rate mortgage loans, secured by multifamily and
commercial properties (collectively, the "Mortgage Loans") that will be
purchased by the



Depositor from Column Financial, Inc. (the "Column Mortgage Loan Seller") and
KeyBank National Association (in such capacity, the "Key Mortgage Loan Seller"
and together with the Column Mortgage Loan Seller, the "Mortgage Loan Sellers"),
pursuant to those certain Mortgage Loan Purchase Agreements, each dated as of
May 1, 2007 (the "Mortgage Loan Purchase Agreements"), and will be serviced by
KeyCorp Real Estate Capital Markets, Inc., as master servicer (in such capacity,
the "Key Master Servicer") and Wachovia Bank, National Association, as master
servicer (the "Wachovia Master Servicer" and together with the Key Master
Servicer, the "Master Servicers"), and if and when necessary ING Clarion
Partners, LLC as special servicer (the "Special Servicer"), pursuant to that
certain Pooling and Servicing Agreement (the "Pooling and Servicing Agreement"),
dated as of May 1, 2007, by and among the Depositor, the Master Servicers, the
Special Servicer 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 2:00 p.m. on April 27, 2007 (the "Time
of Sale"), the Depositor had prepared the following information (collectively,
the "Rule 159 Information"): (i) the Depositor's Free Writing Prospectus dated
April 13, 2007 (the cover page of which is attached hereto as Annex A) (as
modified on April 26, 2007 by the Update to Free Writing Prospectus dated April
26, 2007) to the Depositor's Prospectus dated April 10, 2007, (ii) the term
sheet dated April 13, 2007, relating to the Certificates, and (iii) certain
other "free-writing prospectuses" (as defined pursuant to Rule 405 under the
1933 Act) (each of items (i) through (iii), a "Free Writing Prospectus"). 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


         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 (File No. 333-141613) 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 and will 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

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