CITICORP MORTGAGE SECURITIES, INC. Citicorp Mortgage Securities Trust, Series 2007-8 REMIC Pass-Through Certificates Subordinated Underwriting Agreement
Exhibit
      1.2
    CITICORP
        MORTGAGE SECURITIES, INC.
      Citicorp
        Mortgage Securities Trust, Series 2007-8
      REMIC
        Pass-Through Certificates
      September
        20, 2007
      To:          Banc
        of America Securities LLC, as Subordinated Underwriter
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      ▇▇▇▇▇▇▇▇▇,
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      Ladies
        and Gentlemen:
      Citicorp
        Mortgage Securities, Inc., a Delaware corporation (“CMSI”), proposes to sell to
        you, as subordinated underwriter (the “Subordinated Underwriter”), the offered
        class A-PO, ▇-▇, ▇-▇ and B-3 REMIC Pass-Through Certificates (the “class A-PO
        and offered class B certificates”) described in Schedule I. The class A-PO and
        offered class B certificates evidence ownership interests in a trust (the
        “Trust”) consisting of the mortgage loans described in Schedule I (the “mortgage
        loans”) and related property. The mortgage loans were originated or acquired by
        the affiliates of CMSI identified in Schedule I (the “originators”), and will
        have, at the close of business on the “cut-off date” specified in Schedule I,
        the aggregate principal balance set forth in Schedule I. CMSI will elect
        to
        treat the Trust, or one or more segregated pools of assets within the Trust,
        as
        one or more real estate mortgage investment conduits (each a “REMIC”) for
        purposes of federal income taxation. The class A-PO and offered class B
        certificates are to be issued under a pooling and servicing agreement (the
        “Pooling Agreement”), dated as of the cut-off date, between CMSI, as Depositor,
        CitiMortgage, Inc. (“CMI”), as Servicer and Master Servicer, U.S. Bank National
        Association, in its individual capacity and as Trustee (in such capacity,
        the
“Trustee”), and Citibank, N.A., in its individual capacity and as Paying Agent,
        Certificate Registrar and Authentication Agent.
      CMSI,
        Citigroup Inc., and the Subordinated Underwriter agree as follows:
      1.           Purchase
        and Sale
      Subject
        to the terms and conditions of, and in reliance upon the representations
        and
        warranties made in, this Agreement, CMSI agrees to sell to the Subordinated
        Underwriter, and the Subordinated Underwriter agrees to purchase from CMSI,
        all
        of the class A-PO and offered class B certificates at the purchase price
        set
        forth in Schedule I.
      1
          2.           Delivery
        and Payment
      CMSI
        will
        deliver one or more certificates representing class A-PO and each class of
        offered class B certificates to the Subordinated Underwriter’s account at the
        office, on the date and at the time (the “closing date”) specified in Schedule I
        against payment by the Subordinated Underwriter of the purchase price to
        or upon
        the order of CMSI in the manner provided in Schedule I. Unless otherwise
        specified in Schedule I, the class A-PO and offered class B certificates
        will be
        registered in the name of Cede & Co., as nominee for The Depository Trust
        Company (“DTC”), and the interests of beneficial owners of such class A-PO and
        offered class B certificates will be represented by book entries on the records
        of DTC and its participants. Definitive Certificates representing the class
        A-PO
        and offered class B certificates will be available as set forth in Schedule
        I.
      CMSI
        will
        have the class A-PO and offered class B certificates available for inspection
        by
        the Subordinated Underwriter in New York, New York, one business day prior
        to
        the closing date.
      3.           Registration
        Statement and Prospectus
      (a)        CMSI
        represents and warrants to the Subordinated Underwriter that CMSI has filed
        a
        registration statement (File No. 333-130333), including a prospectus, with
        the
        Securities and Exchange Commission (the “Commission”) on Form S-3 that is
        effective under the Securities Act of 1933, as amended (the “Securities Act”)
        and no stop order suspending the effectiveness of the registration statement
        has
        been issued and no proceedings for that purpose have been initiated by the
        Commission. CMSI further represents and warrants to the Subordinated Underwriter
        that CMSI is not an “ineligible issuer” as defined in Rule 405 under the
        Securities Act, at the date specified in paragraph 3.ii of such
        definition.
      Such
        registration statement, as revised, amended or supplemented, including by
        the
        filing of the Prospectus (as defined below), will at the relevant date be
        the
“Registration Statement” at that date. As used in this Agreement, the
        Registration Statement will include, at the date of their filing, any documents
        filed under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)
        that are incorporated by reference into the prospectus included in the
        Registration Statement pursuant to Item 12 of Form S-3 under the Securities
        Act,
        and the terms “amend,” “amendment” or “supplement” with respect to the
        Registration Statement or the Prospectus will refer to and include the filing
        of
        any document under the Exchange Act so incorporated by reference.
      (b)           The
        Subordinated Underwriter will advise CMSI of the final structure of the class
        A-PO and offered class B certificates sufficiently in advance of the closing
        date so that CMSI can prepare a final prospectus relating to the class A-PO
        and
        offered class B certificates (the “Prospectus”) for delivery to the Subordinated
        Underwriter no later than the closing date. CMSI will use its best efforts
        to
        deliver the Prospectus to the Subordinated Underwriter as soon as reasonably
        practicable following the Subordinated
      2
          Underwriter’s
        advice of the final structure of the class A-PO and offered class B
        certificates. CMSI will file the Prospectus with the Commission pursuant
        to and
        in conformity with Rule 424 under the Securities Act. References to the
        Prospectus at any time will refer to the Prospectus as amended or supplemented
        at such time. CMSI will, prior to the termination of the offering of the
        class
        A-PO and offered class B certificates (the “offering”), promptly advise the
        Subordinated Underwriter
      |  | (i) | when
                  any amendment to the Registration Statement relating to the class
                  A-PO and
                  offered class B certificates has become effective or any revision
                  of or
                  supplement to the Prospectus has been
                  filed, | 
|  | (ii) | of
                  any request by the Commission for an amendment of the Registration
                  Statement or the Prospectus or for any additional
                  information, | 
|  | (iii) | of
                  the issuance by the Commission of any stop order suspending the
                  effectiveness of the Registration Statement or the institution
                  or
                  threatening of any proceeding for that purpose,
                  and | 
|  | (iv) | of
                  the receipt by CMSI of any notification with respect to the suspension
                  of
                  the qualification of the class A-PO and offered class B certificates
                  for
                  sale in any jurisdiction or the initiation or threatening of any
                  proceeding for such purpose. | 
CMSI
        will
        use its best efforts to prevent the issuance of any such stop order and,
        if
        issued, to obtain its withdrawal as soon as possible. CMSI will not file
        prior
        to the termination of the offering any amendment to the Registration Statement
        relating to the class A-PO and offered class B certificates, or any revision
        of
        or supplement to the Prospectus, unless a copy has been furnished to the
        Subordinated Underwriter for its review prior to filing.
      (c)        CMSI
        represents and warrants to the Subordinated Underwriter that the Registration
        Statement on each of the date of this Agreement, the closing date, and each
        time
        of sale (as defined below), and the Prospectus as of its date, the closing
        date,
        and each time of sale following the date of the Prospectus
      |  | (i) | will
                  conform in all material respects to the requirements of the Securities
                  Act
                  and the applicable rules and regulations of the
                  Commission, | 
|  | (ii) | the
                  Registration Statement will not include an untrue statement of
                  a material
                  fact or omit to state a material fact required to be stated therein
                  or
                  necessary to make the statements therein not misleading,
                  and | 
|  | (iii) | the
                  Prospectus will not include an 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, except that CMSI makes no representation or warranty
                  concerning the statements in Schedule I under the heading “Subordinated
                  Underwriter’s Statements to be Included in
                  the | 
3
          Prospectus”
        furnished to CMSI by or on behalf of the Subordinated Underwriter specifically
        for use in connection with the preparation of the Prospectus (the “Subordinated
        Underwriter supplied Prospectus information”).
      For
        purposes of clause (ii) of this section 3(c), the Prospectus will include
        static
        pool information on a website for which a URL address or hyperlink was provided
        in the Prospectus but which information is, pursuant to Item 1105(d) of
        Regulation AB, not deemed to be part of the Prospectus or the Registration
        Statement.
      In
        this
        agreement, “time of sale” means the time of sale (as such term is used in Rule
        159 under the Securities Act) of the class A-PO and offered class B certificates
        by the Subordinated Underwriter to an investor.
      (d)           The
        Subordinated Underwriter represents and warrants to CMSI that the Subordinated
        Underwriter supplied Prospectus information does not include an untrue statement
        of a material fact or omit to state a material fact necessary to make the
        statements therein in the light of the circumstances under which they are
        made,
        not misleading when considered in conjunction with the rest of the Prospectus.
        CMSI acknowledges that the Subordinated Underwriter supplied Prospectus
        information comprises the only written information furnished by or on behalf
        of
        the Subordinated Underwriter for inclusion in the Prospectus.
      (e)        If,
        at any time when the Prospectus is required to be delivered under the Securities
        Act,
      |  | (i) | an
                  event occurs as a result of which the Prospectus at such time would
                  include an untrue statement of a material fact or omit to state
                  a material
                  fact necessary to make the statements therein in the light of the
                  circumstances under which they were made not misleading,
                  or | 
|  | (ii) | the
                  Prospectus must be revised, amended or supplemented to comply with
                  the
                  Securities Act or the rules and regulations of the Commission
                  thereunder, | 
CMSI
        will
        promptly prepare and file with the Commission a revision, amendment or
        supplement that corrects such statement or omission or effects such compliance.
        CMSI will consult with the Subordinated Underwriter, to the extent reasonably
        practicable, on the preparation of such revision, amendment or
        supplement.
      (f)        CMSI
        will furnish to the Subordinated Underwriter and its counsel, without charge,
        so
        long as delivery of the Prospectus is required under the Securities Act,
        as many
        copies of the Prospectus and any revisions or amendments thereof or supplements
        thereto as reasonably requested.
      (g)           If
        the third anniversary of the effective date of the Registration Statement
        occurs
        within three months after the closing date, CMSI will take action as necessary
        to permit the public offering and sale of the class A-PO and offered class
        B
        certificates as contemplated by this Agreement.
      4
          4.           Free
        writing prospectuses and loan tape
      (a)        CMSI
        will deliver electronically to the Subordinated Underwriter in Portable Document
        Format, not later than two business days following the date on which CMSI
        notifies the Subordinated Underwriter that CMSI has chosen it to underwrite
        the
        offering, and will promptly file with the Commission, a “free writing
        prospectus” (as defined in Rule 405 under the Securities Act) containing general
        information about the offering, the structure of the transaction (exclusive
        of a
        description of the properties of any particular class of class A-PO and offered
        class B certificates), the expected parameters of the mortgage loan pools,
        risk
        factors applicable to the mortgage loans, transaction parties known to CMSI,
        the
        material tax and ERISA treatment of the Certificates, whether the Certificates
        will be “mortgage related securities” as defined in the Exchange Act, and URL
        addresses of or hyperlinks to the core prospectus most recently filed by
        CMSI
        with the Commission and to the portion of CMSI’s static pool website containing
        static pool information with respect to REMIC pass-through certificates of
        the
        same asset type (as determined by CMSI) as the mortgage loans (including
        all
        such static pool information, whether or not included in the Prospectus or
        Registration Statement pursuant to Item 1105(d) or Regulation AB, the “CMSI free
        writing prospectus”). CMSI will promptly deliver to the Subordinated Underwriter
        electronically in Portable Document Format updated CMSI free writing
        prospectuses to correct any material misstatements, or omissions to state
        a
        material fact necessary to make the statements therein in the light of the
        circumstances under which they were made not misleading, in previous CMSI
        free
        writing prospectuses. References to the CMSI free writing prospectus at any
        time
        will refer to the CMSI free writing prospectus most recently delivered to
        the
        Subordinated Underwriter (including by correction of static pool information
        on
        a website referred to in the CMSI free writing prospectus) sufficiently prior
        to
        such time as to reasonably permit the Subordinated Underwriter to deliver
        the
        CMSI free writing prospectus to the relevant investor.
      (b)           CMSI
        represents and warrants to the Subordinated Underwriter that:
      |  | (i) | The
                  CMSI free writing prospectus will conform in all material respects
                  to the
                  requirements of the Securities Act and the applicable rules and
                  regulations of the Commission | 
|  | (ii) | At
                  the time of sale, the CMSI free writing prospectus, and any loan
                  tape
                  furnished by CMSI to the Subordinated Underwriter (as supplemented
                  or
                  corrected by CMSI sufficiently prior to such time as to reasonably
                  permit
                  the Subordinated Underwriter to correct any statement made to the
                  investor
                  in reliance on the unsupplemented or uncorrected loan tape), will
                  not
                  contain any untrue statement of a material fact or omit to state
                  a
                  material fact necessary to make the statements therein, in light
                  of the
                  circumstances under which they were made, not misleading ,
                  except | 
5
          that
        CMSI
        makes no representation or warranty to the extent that such untrue statement
        or
        omission was the result of an untrue statement or omission in, or a failure
        to
        provide structural information.
      In
        this
        agreement, “structural information” means any of the following types of
        information supplied by the Subordinated Underwriter to the investor, to
        the
        extent not included in the CMSI free writing prospectus:
      |  | · | The
                  interest rate or any interest rate formula, the anticipated price
                  range,
                  the yield to maturity and/or call, the weighted average life at
                  the
                  pricing speed and under other scenarios that illustrate the material
                  effects of prepayments or changes in interest rates on class A-PO
                  and
                  offered class B certificates (with a description of related prepayment,
                  collateral and other assumptions), and other pricing
                  information. | 
|  | · | Principal
                  and loss allocations to various
                  classes. | 
|  | · | Interest
                  accrual periods for class A-PO and offered class B
                  certificates. | 
|  | · | Whether
                  class A-PO and offered class B certificates represent interests
                  in the
                  entire mortgage pool or in one or more mortgage loan
                  groups. | 
|  | · | A
                  description of third party credit enhancement or derivative instruments
                  selected by the Subordinated Underwriter for the class A-PO and
                  offered
                  class B certificates, together with the identity of and material
                  information about any related provider or counterparty and the
                  ratings
                  assigned to the provider or
                  counterparty. | 
|  | · | The
                  identity of and material information about any special servicer
                  or credit
                  risk manager selected by the Subordinated Underwriter for the class
                  A-PO
                  and offered class B certificates. | 
|  | · | The
                  fees and expenses payable to transaction
                  parties. | 
(c)        CMSI
        will provide the Subordinated Underwriter with one or more loan tapes containing
        “loan level” listings of the mortgage loans that may contain “nonpublic personal
        information” within the meaning of Regulation S-P of the Commission. The
        Subordinated Underwriter acknowledges that, to the extent the listing of
        the
        mortgage loans contains any nonpublic personal information, the Subordinated
        Underwriter will be bound by the provisions of Rule 11 of Regulation S-P
        and
        other applicable law regarding limits on redisclosure and reuse of such
        information.
      (d)           The
        Subordinated Underwriter represents and warrants to CMSI that any written
        communication containing material information about CMSI or its affiliates
        or
        the class A-PO and offered class B certificates furnished to a prospective
        investor by the Subordinated Underwriter, other than a CMSI free writing
        prospectus, the Prospectus, the Registration Statement or the loan tape most
        recently furnished by CMSI to the Subordinated Underwriter (as supplemented
        or
        corrected by CMSI prior to such time)
      6
          |  | (i) | conformed
                  to the terms and conditions for a communication in Rule 134 or
                  a free
                  writing prospectus in Rule 433 under the Securities
                  Act, | 
|  | (ii) | if
                  a free writing prospectus, consisted solely of ABS informational
                  and
                  computational material (as defined in Item 1101(a) of Regulation
                  AB under
                  the Securities Act) and information regarding status, oversubscription,
                  allocation and confirmation of sale,
                  and | 
|  | (iii) | if
                  a free writing prospectus, did not at the time of sale include
                  any untrue
                  statement of a material fact or omit any material fact necessary
                  to make
                  the statements contained therein, when considered in conjunction
                  with the
                  CMSI free writing prospectus delivered to the investor, in light
                  of the
                  circumstances under which they were made, not misleading, except
                  that the Subordinated Underwriter makes no representation or warranty
                  to
                  the extent that (A) the misstatement or omission was the result of a
                  misstatement or omission in information supplied by CMSI to the
                  Subordinated Underwriter that was not corrected by information
                  subsequently supplied by CMSI to the Subordinated Underwriter sufficiently
                  prior to the time of sale as to reasonably permit the Subordinated
                  Underwriter to correct any statement made to the investor based
                  on such
                  misstatement, or (B) the free writing prospectus substantially
                  restates a statement (which statement may include structural information)
                  in the Prospectus or CMSI free writing prospectus (a “restatement”), and
                  does not omit a statement in the Prospectus or CMSI free writing
                  prospectus necessary to make the restatement, when considered in
                  conjunction with the free writing prospectus and other information
                  delivered to the prospective investor, in light of the circumstances
                  under
                  which the restatement was made, not
                  misleading. | 
(e)        CMSI
        will file a CMSI free writing prospectus containing (i) a description of
        the final structure of the class A-PO and offered class B certificates and
        (ii) the information contained in the final loan tape delivered to the
        Subordinated Underwriter, all in conformity with Rule 433 under the Securities
        Act.
      (f)        The
        Subordinated Underwriter will not sell, and will obligate each dealer to
        whom it
        sells any class A-PO and offered class B certificates (which obligation may
        be
        in the form of a trade stipulation and which must name CMSI as an intended
        third
        party beneficiary) not to sell any class A-PO and offered class B
        certificates
      |  | (i) | to
                  any investor who is not an institutional investor unless the sale
                  is
                  accompanied or preceded by delivery of the Prospectus,
                  and | 
|  | (ii) | to
                  any investor prior to the time the Prospectus is filed with the
                  SEC unless
                  at the time of sale the Subordinated Underwriter delivers to the
                  investor
                  the CMSI free writing prospectus and the
                  supplemental | 
7
          |  | information
                  that is then known or available to the Subordinated
                  Underwriter. | 
(g)           The
        Subordinated Underwriter will file with the Commission not later than the
        date
        of its first use any free writing prospectus that is distributed by or on
        behalf
        of the Subordinated Underwriter in a manner reasonably designed to lead to
        its
        broad, unrestricted dissemination. CMSI will provide the Subordinated
        Underwriter with any filing information needed to complete such
        filing.
      (h)           The
        Subordinated Underwriter will, in conformity with Rule 433(g) under the
        Securities Act, retain all free writing prospectuses that it has used in
        the
        offering and that are not filed with the Commission for three years following
        the initial bona fide offering of the class A-PO and offered class B
        certificates. If there is any litigation or threatened litigation against
        CMSI
        or any of its affiliates with respect to the offering, the Subordinated
        Underwriter will, on CMSI’s request, make copies of such documents available to
        CMSI.
      (i)        The
        Subordinated Underwriter will promptly provide CMSI with any information
        within
        the Subordinated Underwriter’s reasonable control that CMSI reasonably requests
        to enable CMSI to meet its disclosure and reporting obligations under the
        Securities Act and the Exchange Act in connection with the class A-PO and
        offered class B certificates. The Subordinated Underwriter will use its best
        efforts to cause any credit enhancement provider, derivative counterparty,
        special servicer or credit risk manager arranged by the Subordinated Underwriter
        in connection with the class A-PO and offered class B certificates to promptly
        provide to CMSI such narrative disclosure, financial information, including
        required accountants’ consents, and other information as CMSI may reasonably
        request to enable CMSI to meet its disclosure and reporting obligations under
        the Securities Act and the Exchange Act.
      5.           Other
        representations and warranties
      CMSI
        represents and warrants to the Subordinated Underwriter that:
      (a)        Each
        of the class A-PO and B-1 certificates will, when issued, be a “mortgage related
        security,” as defined in section 3(a)(41) of the Exchange Act, and each of the
        class A-PO and offered class B certificates, when validly authenticated,
        issued
        and delivered in accordance with the Pooling Agreement, will be duly and
        validly
        issued and outstanding and entitled to the benefits of the Pooling
        Agreement.
      (b)           Compliance
        by CMSI with the provisions of this Agreement and the Pooling Agreement do
        not,
        and will not on the closing date, conflict with CMSI’s certificate of
        incorporation or by-laws or any contract to which CMSI is a party.
      (c)        On
        the closing date, each of this Agreement and the Pooling Agreement will have
        been duly authorized, executed and delivered by CMSI and, assuming the valid
        execution of such agreements by the other parties, each such agreement will
        constitute a valid and binding agreement of CMSI enforceable against it in
        accordance with its terms, except as the same may be limited by bankruptcy,
        insolvency, reorganization or other
      8
          laws
        relating to or affecting the enforcement of creditors’ rights and by general
        equity principles.
      (d)           CMSI
        has been duly organized and is validly existing under the laws of the State
        of
        Delaware, with corporate power and authority to own its properties and conduct
        its business as described in the Prospectus.
      6.           Expenses;
        Blue Sky
      (a)        CMSI
        will pay all expenses incidental to the performance of its obligations under
        this Agreement, including expenses of
      |  | (i) | preparing,
                  filing and reproducing the Prospectus, of preparing, filing and
                  reproducing the CMSI free writing prospectus, the Registration
                  Statement,
                  this Agreement, and the Pooling
                  Agreement, | 
|  | (ii) | KPMG
                  LLP, and | 
|  | (iii) | preparing
                  and delivering the class A-PO and offered class B certificates
                  to
                  DTC, | 
provided,
        however, that except as provided in this section (a) and in section 10, the
        Subordinated Underwriter will pay (A) all of its own expenses, including
        the
        fees of Cadwalader, ▇▇▇▇▇▇▇▇▇▇ &
▇▇▇▇ LLP and any other counsel to the
        Subordinated Underwriter, (B) any transfer taxes on resale of any of the
        class
        A-PO and offered class B certificates by it, (C) advertising expenses connected
        with any offers made by the Subordinated Underwriter, and (D) expenses of
        printing the Prospectus.
      (b)           CMSI
        will use its best efforts to arrange for, and will pay all expenses of, the
        qualification of the class A-PO and offered class B certificates for sale
        under
        the laws of such jurisdictions as the Subordinated Underwriter may designate,
        to
        maintain such qualifications in effect so long as required for the distribution
        of the class A-PO and offered class B certificates and to arrange for the
        determination of the legality of the class A-PO and offered class B certificates
        for purchase by institutional investors, However, CMSI will not be required
        to
        qualify to do business in any jurisdiction where it is not now so qualified
        or
        to take any action that would subject it to general or unlimited service
        of
        process in any jurisdiction where it is not now so subject.
      (c)        If
        for any reason other than default by the Subordinated Underwriter in its
        obligation to purchase the class A-PO and offered class B certificates or
        termination by the Subordinated Underwriter pursuant to section 11, CMSI
        does
        not deliver the class A-PO and offered class B certificates as provided in
        this
        agreement, CMSI will reimburse the Subordinated Underwriter for its
        out-of-pocket expenses (including reasonable fees and disbursements of its
        counsel) reasonably incurred by the Subordinated Underwriter in preparing
        to
        purchase the class A-PO and offered class B certificates, but CMSI will have
        no
        further liability to the Subordinated Underwriter with respect to the class
        A-PO
        and offered class B certificates, except as provided in sections 6(a) and
        6(b)
        above.
      9
          7.           No
        Fiduciary Relationship
      (a)        The
        Subordinated Underwriter has been retained solely to act as underwriter in
        connection with the sale of the class A-PO and offered class B certificates,
        and
        no fiduciary, advisory or agency relationship between CMSI or Citigroup Inc.,
        on
        the one hand, and the Subordinated Underwriter on the other, has been created
        in
        respect of any of the transactions contemplated by this Agreement, irrespective
        of whether the Subordinated Underwriter has advised or is advising CMSI or
        Citigroup Inc. on other matters. CMSI and Citigroup Inc. acknowledge that
        the
        Subordinated Underwriter has not provided, and is not expected to provide,
        any
        legal, accounting, regulatory or tax advice to CMSI or Citigroup Inc. with
        respect to such transactions.
      (b)           The
        purchase price was established by CMSI following discussions and arm’s-length
        negotiations with the Subordinated Underwriter, and CMSI is capable of
        evaluating and understanding and understands and accepts the terms, risks
        and
        conditions of the transactions contemplated by this Agreement, and the
        Subordinated Underwriter will have no fiduciary responsibility or liability
        to
        CMSI or Citigroup Inc. regarding such transactions.
      (c)        Each
        of CMSI and Citigroup Inc. has been advised that the Subordinated Underwriter
        and its affiliates are engaged in a broad range of transactions that may
        involve
        interests that differ from those of CMSI and Citigroup Inc., and that the
        Subordinated Underwriter has no obligation to disclose such interests and
        transactions to CMSI or Citigroup Inc. by virtue of any fiduciary, advisory
        or
        agency relationship.
      (d)           Each
        of CMSI and Citigroup Inc. waives, to the fullest extent permitted by applicable
        law, any claims it may have against the Subordinated Underwriter for breach
        of
        fiduciary duty, and agrees that the Subordinated Underwriter will have no
        liability (whether direct or indirect) to CMSI or Citigroup Inc. in respect
        of
        such a fiduciary duty claim or to any person asserting a fiduciary duty claim
        on
        behalf of or in right of CMSI or Citigroup Inc., including stockholders,
        employees or creditors of CMSI or Citigroup Inc. Any review by the Subordinated
        Underwriter of CMSI, the transactions contemplated by this agreement, or
        any
        related matters will be performed solely for the Subordinated Underwriter’s
        benefit and not on behalf of CMSI or Citigroup Inc.
      8.           Conditions
        to the Obligation of the Subordinated Underwriter
      The
        Subordinated Underwriter’s obligation to purchase the class A-PO and offered
        class B certificates will be subject to the accuracy in all material respects
        of
        CMSI’s representations and warranties in this Agreement at the date of this
        Agreement and the closing date, to the accuracy of the statements of CMSI
        made
        in any officer’s certificate delivered pursuant to this Agreement, to the
        performance by CMSI of its obligations under this Agreement, and to the
        following additional conditions on the closing date:
      10
          (a)        No
        stop order suspending the effectiveness of the Registration Statement has
        been
        issued and no proceedings for that purpose instituted and pending or
        threatened.
      (b)           CMSI
        has delivered to the Subordinated Underwriter a certificate of CMSI, dated
        the
        closing date and signed by the President, Senior Vice President, Vice President
        or an Assistant Vice President of CMSI, to the effect that the signer of
        the
        certificate has examined the Registration Statement, the Prospectus and this
        Agreement and that:
      |  | (i) | CMSI’s
                  representations and warranties in this Agreement are true and correct
                  in
                  all material respects on the closing date with the same effect
                  as if made
                  on the closing date, and CMSI has complied with all agreements
                  and
                  satisfied all the conditions on its part to be performed or satisfied
                  at
                  or prior to the closing date; and | 
|  | (ii) | no
                  stop order suspending the effectiveness of the Registration Statement
                  has
                  been issued, and no proceedings for that purpose instituted and
                  pending
                  or, to such officer’s knowledge, threatened as of the closing
                  date. | 
(c)        CMSI
        has delivered to the Subordinated Underwriter an opinion, dated the closing
        date, of the General Counsel, Finance and Capital Markets of Citigroup Inc.,
        to
        the effect that:
      |  | (i) | Each
                  of CMSI and CMI is a validly existing corporation in good standing
                  under
                  the laws of the State of Delaware and the State of New York, respectively,
                  with corporate power and authority under such laws to own its properties
                  and assets and conduct its business as described in the
                  Prospectus; | 
|  | (ii) | Citibank,
                  N.A. has been duly chartered and is validly existing as a national
                  banking
                  association in good standing under the laws of the United
                  States; | 
|  | (iii) | This
                  Agreement has been duly authorized, executed and delivered by each
                  of CMSI
                  and Citigroup Inc.; | 
|  | (iv) | The
                  Mortgage Loan Purchase Agreement has been duly authorized, executed
                  and
                  delivered by CMSI and each originator and constitutes the valid
                  and
                  legally binding obligation of CMSI and each such originator, enforceable
                  in accordance with its terms, except as enforceability may be limited
                  by
                  bankruptcy, insolvency, reorganization or other similar laws relating
                  to
                  or affecting the enforcement of creditors’ rights and by general
                  principles of equity; | 
|  | (v) | The
                  Pooling Agreement has been duly authorized, executed and delivered
                  by
                  CMSI, CMI, as Servicer and Master Servicer, and Citibank, N.A.,
                  in its
                  individual capacity and as Paying Agent, Certificate Registrar
                  and
                  Authentication Agent and, assuming valid execution thereof by U.S.
                  Bank
                  National Association, in its
                  individual | 
11
          capacity
        and as Trustee, constitutes a valid and legally binding agreement of CMSI,
        CMI,
        and Citibank, N.A., enforceable in accordance with its terms, except as
        enforceability may be limited by bankruptcy, insolvency, reorganization or
        other
        similar laws relating to or affecting the enforcement of creditors’ rights and
        by general principles of equity;
      |  | (vi) | The
                  Pooling Agreement is not required to be qualified under the Trust
                  Indenture Act of 1939, as amended, and the Trust Fund (as defined
                  in the
                  Pooling Agreement) is not required to be registered under the Investment
                  Company Act of 1940, as amended; | 
|  | (vii) | The
                  class A-PO and offered class B certificates have been duly authorized,
                  executed, issued, authenticated and delivered, and are validly
                  issued and
                  outstanding and entitled to the benefits provided by the Pooling
                  Agreement; | 
|  | (viii) | Assuming
                  that the class A-PO and B-1 certificates are rated at the time
                  of issuance
                  in one of the two highest rating categories by a nationally recognized
                  statistical rating organization, each such offered certificate
                  at such
                  time will be a “mortgage related security,” as defined in section 3(a)(41)
                  of the Exchange Act; | 
|  | (ix) | The
                  Registration Statement is effective under the Securities Act, and,
                  to the
                  best knowledge of such counsel: | 
(A)
        No
        stop order suspending the effectiveness of the Registration Statement has
        been
        issued and no proceedings for that purpose have been instituted or are pending
        or have been threatened under the Securities Act.
      (B)
        Each
        of the Registration Statement at its effective date and the closing date,
        and
        the Prospectus at its date and the closing date (in each case, with the
        exception of any information incorporated by reference therein and any
        numerical, financial, statistical or quantitative data) appeared on its face
        to
        conform in all material respects to the requirements of the Securities Act
        and
        the applicable rules and regulations of the Commission.
      (C)
        The
        descriptions in the Prospectus and the Pooling Agreement at the closing date
        of
        the class A-PO and offered class B certificates, and of the aspects of certain
        statutes as set forth in the Prospectus under the heading “Core prospectus—ERISA
        considerations” and “Prospectus supplement—Additional ERISA considerations,”
are, to the extent that they constitute statements of matters of law or legal
        conclusions with respect thereto, accurate in all material respects;
        and
      12
          |  | (x) | Such
                  other opinions with regard to secured transactions, bankruptcy,
                  insolvency
                  and related matters as the Subordinated Underwriter reasonably
                  requests. | 
Such
        opinion may express its reliance (1) as to factual matters on the
        representations and warranties made by, and on certificates or other documents
        furnished by officers of, the parties to this Agreement and the Pooling
        Agreement, (2) as to legal matters relating to the Employee Retirement
        Income Security Act of 1974, on an opinion, dated the closing date, of counsel
        acceptable to the Subordinated Underwriter, and (3) as to legal matters
        relating to secured transactions, bankruptcy, insolvency and related matters,
        on
        an opinion, dated the closing date, of Cadwalader, ▇▇▇▇▇▇▇▇▇▇ &
▇▇▇▇ LLP, special bankruptcy counsel to
        CMSI. Such opinion may assume the due authorization, execution and delivery
        of
        the instruments and documents referred to therein by the parties thereto
        other
        than CMSI, CMI, Citibank, N.A., Citigroup Inc. and the originators. Such
        opinion
        may be qualified as an opinion only on the General Corporation Law of the
        State
        of Delaware, the laws of each state in which the writer of the opinion is
        admitted to practice law, and the federal law of the United States.
      (d)           CMSI
        has delivered to the Subordinated Underwriter a letter, dated the closing
        date,
        of the General Counsel, Finance and Capital Markets of Citigroup Inc., to
        the
        effect that in the course of such counsel’s review of the Registration Statement
        and the Prospectus and discussion of the same with certain officers of CMSI
        and
        the originators and their auditors, no facts came to the attention of such
        counsel that led such counsel to believe that
      |  | (i) | the
                  Registration Statement as of its effective date or the closing
                  date
                  included an untrue statement of a material fact or omitted to state
                  a
                  material fact required to be stated therein or necessary to make
                  the
                  statements therein not misleading,
                  or | 
|  | (ii) | the
                  Prospectus as of its date or the closing date, included an untrue
                  statement of a 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, | 
it
        being
        understood that such counsel need express no view as to any information
        incorporated by reference or any financial, numerical, statistical or
        quantitative data in the Registration Statement or the Prospectus.
      (e)        CMSI
        has delivered to the Subordinated Underwriter an opinion, dated the closing
        date, of Cadwalader, ▇▇▇▇▇▇▇▇▇▇ &
▇▇▇▇ LLP, special tax counsel to CMSI, to
        the effect that the statements in the Prospectus under the headings “Core
        prospectus–Taxation of certificate holders,” “Core prospectus—Taxation of the
        Trust,” and “Prospectus supplement—Federal income tax consequences,” to the
        extent such statements summarize material tax consequences of the purchase,
        beneficial ownership and disposition of the class A-PO and offered class
        B
        certificates to the holders thereof described therein, are correct in all
        material respects.
      13
          (f)        The
        Subordinated Underwriter have received from Cadwalader, ▇▇▇▇▇▇▇▇▇▇ &
▇▇▇▇ LLP, counsel for the Subordinated
        Underwriter, such opinion or opinions, dated the closing date, with respect
        to
        the issuance and sale of the class A-PO and offered class B certificates,
        the
        Registration Statement and the Prospectus, and such other related matters
        as the
        Subordinated Underwriter may reasonably request.
      (g)           KPMG
        LLP have furnished to the Subordinated Underwriter a letter, dated the closing
        date, in form and substance satisfactory to the Subordinated Underwriter,
        stating in effect that they have performed certain specified procedures,
        agreed
        upon between KPMG LLP, CMSI and the Subordinated Underwriter, as a result
        of
        which they have determined that the information of an accounting, financial
        or
        statistical nature with respect to “static pool information” contained on CMSI’s
        website at ▇▇▇.▇▇▇▇▇▇▇▇▇▇▇▇▇▇▇.▇▇▇ relating to REMIC pass-through certificates
        issued after January 1, 2006 and included in the Prospectus under Rule 312
        of
        the Commission’s Regulation S-T, agrees with the accounting records of the
        originators, excluding any questions of legal interpretation
      (h)           KPMG
        LLP have furnished to the Subordinated Underwriter a letter, dated the closing
        date, in form and substance satisfactory to the Subordinated Underwriter,
        stating in effect that:
      |  | (i) | They
                  have performed certain specified procedures, agreed upon between
                  KPMG LLP
                  CMSI and the Subordinated Underwriter, as a result of which they
                  have
                  determined that the information of an accounting, financial or
                  statistical
                  nature (which is limited to accounting, financial or statistical
                  information derived from the general accounting records of the
                  originators
                  and which is obtained from an analysis of a sample of the mortgage
                  loans)
                  set forth in the Prospectus under the caption “Prospectus
                  supplement—Summary—Series overview—the mortgage loans at September 1, 2007
                  (the cut-off date)” and in the detailed description relating to such
                  prospectus supplement and the mortgage loans agrees with the accounting
                  records of the originators, excluding any questions of legal
                  interpretation. | 
|  | (ii) | They
                  have compared the data contained in a data sheet or computer tape
                  prepared
                  by CMI for the mortgage loans to information contained in the mortgage
                  loan files furnished by the originators and in such other sources
                  as will
                  be specified by them, based on an appropriate sampling thereof,
                  and found
                  such data and information to be in agreement, unless otherwise
                  noted in
                  such letter. | 
(i)        If
        there is more than one class of class A-PO and offered class B certificates,
        KPMG LLP have furnished to the Subordinated Underwriter a letter, dated the
        date
        of the Prospectus, in form and substance satisfactory to the Subordinated
        Underwriter, stating in effect that:
      14
          |  | (i) | Using
                  the assumptions and methodology used by CMSI (which include and
                  do not
                  conflict with any assumptions and methodology set forth in the
                  Prospectus), all of which will be described by reference in such
                  letter,
                  they have recalculated the percentages and weighted average lives
                  set
                  forth in the Prospectus in the tables relating to the “Prospectus
                  supplement—Principal balance as percent of initial principal balance” for
                  each class of class A-PO and offered class B certificates at certain
                  percentages of the prepayment model to be set forth in the Prospectus,
                  compared the results of their calculations to the corresponding
                  items in
                  the respective table and found each such percentage and weighted
                  average
                  life set forth in each such table to be in agreement with the respective
                  results of such calculations. | 
|  | (ii) | Using
                  the assumptions and methodology prescribed in the Prospectus, they
                  have
                  recalculated, for each distribution day (as defined in the Prospectus),
                  the aggregate of the amount of cash to be on deposit in the Trust
                  on the
                  determination day immediately preceding such distribution day and
                  found
                  that such aggregate amount equals or exceeds the aggregate amount
                  of
                  interest and distributions in reduction of principal balance that
                  is
                  distributable on the class A-PO and offered class B certificates
                  on the
                  following distribution day, as recalculated by
                  them. | 
|  | (iii) | Using
                  the assumptions and methodology prescribed in the Pooling Agreement
                  and
                  the Prospectus, they have recomputed the last distribution day
                  for each
                  class of class A-PO and offered class B certificates and found
                  such dates
                  to be in agreement with those set forth in the
                  Prospectus. | 
|  | (iv) | If
                  one or more classes of offered class B certificates will be entitled
                  to
                  receive distributions in respect of interest at other than a fixed
                  rate or
                  distributions in reduction of principal balance according to a
                  schedule of
                  planned or targeted balances, or have other characteristics which
                  give
                  rise to the use of tables in the Prospectus reflecting yield or
                  cash flow,
                  such letters will also set forth such other statements as are customarily
                  set forth by KPMG LLP in such letters with respect to such
                  classes. | 
|  | (v) | Using
                  the assumptions and methodology used by CMSI set forth in the Prospectus,
                  all of which will be described by reference in such letter, they
                  have
                  recalculated the percentages set forth in the Prospectus in the
                  tables
                  entitled “Prospectus supplement—Weighted average lives and yields to
                  maturity—Pre-tax yield to maturity” of classes B-2 and B-3, compared the
                  results of their calculations to the corresponding items in such
                  table and
                  found each such percentage set forth in such table to be in agreement
                  with
                  the results of such calculations. | 
15
          (j)        Subsequent
        to the date hereof, there will not have occurred any change, or any development
        involving a prospective change, in or affecting the business or properties
        of
        CMSI which the Subordinated Underwriter concludes, after consultation with
        CMSI,
        in the judgment of the Subordinated Underwriter, materially impairs the
        investment quality of the class A-PO and offered class B certificates so
        as to
        make it impractical or inadvisable to proceed with the public offering or
        the
        delivery of the class A-PO and offered class B certificates as contemplated
        by
        the Prospectus.
      (k)           The
        class A-PO and offered class B certificates have been rated at least the
        rating
        or ratings specified in Schedule I by the rating agency or agencies specified
        in
        Schedule I and such ratings will not have been rescinded or placed under
        review.
      (l)        CMSI
        have furnished to the Subordinated Underwriter such further information,
        certificates and documents as the Subordinated Underwriter may reasonably
        have
        requested not less than three full business days prior to the closing
        date.
      If
        any of
        the conditions specified in this section 8 are not fulfilled in all material
        respects when and as provided in this Agreement, or if any of the opinions
        and
        certificates mentioned above or elsewhere in this Agreement are not in all
        material respects reasonably satisfactory in form and substance to the
        Subordinated Underwriter and its counsel, this Agreement and all obligations
        of
        the Subordinated Underwriter hereunder may be canceled at, or at any time
        prior
        to, the closing date by the Subordinated Underwriter. Notice of such
        cancellation will be given to CMSI in writing, or by telephone or telegraph
        confirmed in writing.
      9.           Condition
        to the Obligation of CMSI
      The
        obligation of CMSI to issue and sell the class A-PO and offered class B
        certificates will be subject to the satisfaction of the conditions
        that
      (a)        on
        the closing date, the offered class A (other than class A-PO) certificates
        (as
        described in the Prospectus) have been issued and sold under the Senior
        Underwriting Agreement dated August 24, 2007 among CMSI, Citigroup Inc. and
        Citigroup Global Markets Inc., and the class ▇-▇, ▇-▇ and B-6 certificates
        (as
        described in the Prospectus) have been issued and sold under the Purchase
        Agreement dated the date of this Agreement among CMSI, Citigroup Inc. and
        the
        purchaser thereof; and
      (b)           the
        Subordinated Underwriter has advised CMSI of the final structure of the class
        A-PO and offered class B certificates sufficiently in advance of the closing
        date so as to enable CMSI to prepare the Prospectus for delivery to the
        Subordinated Underwriter by the closing date.
      10.           Indemnification
        and Contribution
      (a)        In
        this section 10,
      |  | (i) | “claims”
                  includes losses, claims, damages, expenses (including legal and
                  other
                  expenses reasonably incurred in investigating or
                  defending | 
16
          the
        claims, and damages resulting from the Subordinated Underwriter’s having to
        reform a contract for the sale of securities to an investor) or liabilities,
        joint or several, (or actions in respect thereof) under the Securities Act,
        the
        Exchange Act, or other federal or state statutory law or regulation, at common
        law or otherwise, and
      |  | (ii) | a
                  “controlling person” of a party is a person that controls the party within
                  the meaning of either the Securities Act or the Exchange Act, and
                  in the
                  case of CMSI includes any person who signed the Registration
                  Statement. | 
(b)           CMSI
        will indemnify and hold harmless the Subordinated Underwriter and each of
        its
        controlling persons against any claims to which any of them becomes subject,
        to
        the extent such claims arise out of or are based upon a breach of any
        representation or warranty given by CMSI to the Subordinated Underwriter
        in
        section 3(a), 3(c) or 4(b).
      (c)        The
        Subordinated Underwriter will indemnify and hold harmless CMSI and each of
        its
        controlling persons against any claims to which any of them becomes subject,
        to
        the extent such claims are based upon breach of any express representation
        or
        warranty given by the Subordinated Underwriter to CMSI in section 3(d) or
        4(d).
      (d)           The
        indemnities in sections 10(b) and 10(c) will be in addition to any liability
        that CMSI or the Subordinated Underwriter may otherwise have.
      (e)        If
        a person entitled to indemnification under this section 10 is notified of
        any
        action or threatened action involving a claim for which the person may be
        entitled to seek indemnification or reimbursement under this section 10,
        the
        person must promptly notify the indemnifying party in writing of the action.
        However, such person’s failure to notify the indemnifying party will not relieve
        the indemnifying party from any liability to such person (i) under this
        section 10 except to the extent that the indemnifying party is materially
        prejudiced by such failure, or (ii) otherwise than under this section
        10.
      The
        indemnifying party will be entitled to participate in any such action, and
        to
        the extent that it may elect by written notice delivered to the indemnified
        person promptly after being notified by the indemnified person of the action,
        to
        assume the defense thereof, with counsel selected by the indemnifying party
        and
        reasonably satisfactory to the indemnified person. However, if the defendants
        in
        any such action include both indemnified persons and the indemnifying party,
        and
        an indemnified person reasonably concludes that there may be legal defenses
        available to it and/or other indemnified persons that are different from
        or
        additional to those available to the indemnifying party, the indemnified
        person
        or persons may select a single separate counsel to assert such legal defenses
        and to otherwise participate in the defense of the action on behalf of such
        indemnified person or persons.
      Upon
        the
        indemnifying party’s so assuming the defense of the action, the indemnifying
        party will not be liable to the indemnified person in connection with the
        defense thereof, except
      17
          |  | (i) | for
                  the expenses of a single separate counsel to represent indemnified
                  persons
                  in accordance with the last sentence in the preceding paragraph,
                  or | 
|  | (ii) | where
                  the indemnifying party does not employ counsel reasonably satisfactory
                  to
                  the indemnified person within a reasonable time after the indemnified
                  person notifies the indemnifying party of the
                  action. | 
The
        indemnifying party will not be liable for a settlement of any proceeding
        effected without its written consent, but if settled with such consent or
        if
        there is a final judgment for the plaintiff, the indemnifying party will
        indemnify the indemnified person from and against any loss or liability by
        reason of such settlement or judgment. No indemnifying party will settle
        any
        pending or threatened proceeding without the prior written consent of each
        person who could seek indemnity under this section 10 with respect to such
        proceeding, unless such settlement
      |  | (i) | does
                  not include a statement as to or admission of, fault, culpability
                  or a
                  failure to act by or on behalf of such person,
                  and | 
|  | (ii) | includes
                  an unconditional release of such indemnified person from all liability
                  on
                  claims that are the subject matter of such
                  proceeding. | 
(f)        In
        order to provide for just and equitable contribution in circumstances in
        which
        the indemnification provided for in this section 10 is due in accordance
        with
        its terms but is legally unavailable or insufficient to hold harmless an
        indemnified person, CMSI and the Subordinated Underwriter will contribute
        to the
        aggregate claims to which CMSI and the Subordinated Underwriter may be subject
        in an appropriate proportion to reflect both the relative benefits received
        by
        and the relative fault of CMSI and the Subordinated Underwriter, except
        that no person guilty of fraudulent misrepresentation (within the meaning
        of
        section 11(f) of the Securities Act) will be entitled to contribution from
        any
        person who was not guilty of fraudulent misrepresentation. The relative benefits
        received by CMSI and the Subordinated Underwriter will be deemed to be in
        the
        same proportion as the total net proceeds received by CMSI bears to the total
        underwriting discount and commission received by the Subordinated Underwriter.
        Relative fault will be determined by reference to whether any untrue or alleged
        untrue statement of a material fact or omission or alleged omission to state
        a
        material fact, or such inaccurate or untrue statement or representation,
        relates
        to information supplied by CMSI or the Subordinated Underwriter, the intent
        of
        the parties and their relative knowledge, access to information and opportunity
        to correct or prevent such statement, omission or representation. For purposes
        of this section 10, each controlling person will have the same rights to
        contribution as the related party. Any person entitled to contribution will,
        promptly after receipt of notice of commencement of any action, suit or
        proceeding against such person for which a claim for contribution may be
        made
        against a party under this section (f), notify the party from whom contribution
        may be sought, but the omission to so notify such party will not relieve
        such
        party from any other obligation it may have under this section (f) or otherwise.
        Notwithstanding the foregoing, the Subordinated
      18
          Underwriter
        will not be required to contribute any amount in excess of the amount by
        which
        the total price at which the class A-PO and offered class B certificates
        were
        offered to the public exceeds the amount of any damages that the Subordinated
        Underwriter has otherwise been required to pay by reason of such untrue or
        alleged untrue statement or omission or alleged omission.
      11.           Termination
      This
        Agreement will be subject to termination in the absolute discretion of the
        Subordinated Underwriter, by notice given to CMSI prior to delivery of and
        payment for the class A-PO and offered class B certificates, if prior to
        such
        time (i) trading in securities generally on the New York Stock Exchange has
        been
        suspended or materially limited, (ii) a general moratorium on commercial
        banking
        activities in New York is declared by either federal or New York State
        authorities, or (iii) there is a material outbreak or escalation of hostilities
        or other calamity or crisis the effect of which on the financial markets
        of the
        United States makes it, in the reasonable judgment of the Subordinated
        Underwriter after consultation with CMSI, impracticable to market the class
        A-PO
        and offered class B certificates.
      12.           Representations
        and indemnities to survive
      The
        respective agreements, representations, warranties, indemnities and other
        statements of CMSI and Citigroup Inc. and their respective officers and of
        the
        Subordinated Underwriter set forth in or made pursuant to this Agreement
        will
        remain in full force and effect, regardless of any investigation made by
        or on
        behalf of the Subordinated Underwriter, CMSI or Citigroup Inc. or any of
        the
        officers, directors or controlling persons referred to in section 10 hereof,
        and
        will survive delivery of and payment for the class A-PO and offered class
        B
        certificates. The provisions of sections 10 and 13 hereof will survive the
        termination or cancellation of this Agreement.
      13.           Obligation
        of Citigroup Inc.
      Citigroup
        Inc. agrees, in consideration of and as an inducement to the Subordinated
        Underwriter’s purchase of the class A-PO and offered class B certificates from
        CMSI, to indemnify and hold harmless the Subordinated Underwriter, and each
        person who controls the Subordinated Underwriter against any failure by CMSI
        to
        perform any of its obligations under this Agreement, including any obligation
        of
        CMSI to the Subordinated Underwriter pursuant to sections 6 and 10 hereof,
        after
        receipt from the Subordinated Underwriter of written notice of any such
        failure.
      14.           Successors
      This
        Agreement will inure to the benefit of and be binding upon the parties hereto
        and their respective successors and the officers, directors and controlling
        persons referred
      19
          to
        in
        section 10 hereof and their respective successors and assigns, and no other
        person will have any right or obligation hereunder.
      15.           Applicable
        law
      This
        Agreement will be governed by and construed in accordance with the laws of
        the
        State of New York.
      16.           Miscellaneous
      This
        Agreement supersedes all prior or contemporaneous agreements and understandings
        relating to its subject matter. Neither this Agreement nor any term hereof
        may
        be changed, waived, discharged or terminated except by a writing signed by
        the
        party against whom enforcement of such change, waiver, discharge or termination
        is sought.
      17.           Notices
      All
        communications hereunder will be in writing and effective only upon receipt
        and,
        if sent to the Subordinated Underwriter, will be delivered to the Subordinated
        Underwriter’s address first stated in this Agreement (with a copy to its General
        Counsel’s Office), or if sent to CMSI, will be delivered to Citicorp Mortgage
        Securities, Inc., ▇▇▇▇ ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇, ▇’▇▇▇▇▇▇, ▇▇▇▇▇▇▇▇ ▇▇▇▇▇, Attn: ▇▇▇▇▇▇
        ▇. ▇▇▇▇▇▇▇, or if sent to Citigroup Inc., will be delivered to Citigroup
        Inc.,
        Citigroup Center, ▇▇▇ ▇▇▇▇ ▇▇▇▇ ▇▇▇▇▇▇, ▇▇▇ ▇▇▇▇▇, ▇▇▇ ▇▇▇▇, ▇▇▇ ▇▇▇▇ ▇▇▇▇▇,
        Attn: ▇▇▇▇▇▇▇ ▇▇▇▇▇.
      20
          If
        the
        foregoing is in accordance with your understanding of our agreement, please
        sign
        and return to each of the undersigned a copy hereof, whereupon this letter
        and
        your acceptance will represent a binding agreement among CMSI, Citigroup
        Inc.
        and the Subordinated Underwriter.
      Very
        truly yours,
      CITICORP
        MORTGAGE SECURITIES, INC.
      By:           /s/
        ▇▇▇▇▇ ▇. ▇▇▇▇▇    
      ▇▇▇▇▇
        ▇.
        ▇▇▇▇▇
      Assistant
        Vice President
      CITIGROUP
        INC.
      By:           /s/
        ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇    
      ▇▇▇▇▇▇▇
        ▇. ▇▇▇▇▇
      Assistant
        Treasurer
      The
        foregoing Agreement is hereby confirmed and
      accepted
        as of the date first above written.
      BANC
        OF
        AMERICA SECURITIES LLC
      By:           /s/
        ▇▇▇▇▇ ▇. Good    
      Name:  ▇▇▇▇▇
        ▇. Good, Principal
      Authorized
        Signatory
      21
          SCHEDULE
        I
      Subordinated
        Underwriting Agreement dated September 20, 2007
      Citicorp
        Mortgage Securities Trust, Series 2007-8
      REMIC
        Pass-Through Certificates
      | Description
                  of mortgage loans: | For
                  each pool of mortgage loans, the description under COLLATERAL INFORMATION
                  on the Trade Ticket that is attached as Attachment A hereto. Any
                  reference
                  in the Trade Ticket to 15 YR REG N/C means 10- to 15- year fixed-rate
                  conventional one- to four-family mortgage loans, any reference
                  to 15 YR NC
                  ALT-A means
                  10- to 15- year fixed-rate Alt-A one- to four-family mortgage loans,
                  any
                  reference to 30 YR REG N/C means 20- to 30- year fixed-rate conventional
                  one- to four-family mortgage loans, any reference to 30 YR RELO
                  N/C means
                  20- to 30- year fixed-rate conventional one- to four-family mortgage
                  loans
                  that are originated through corporate relocation programs, any
                  reference
                  to 30 YR REG N/C IO means 20- to 30- year fixed-rate conventional
                  one- to
                  four-family mortgage loans that have an interest-only period of
                  ten years
                  following origination, any reference to 30 YR NC ALT-A means
                  20- to 30- year fixed-rate Alt-A one- to four-family mortgage loans,
                  and
                  any reference to 30
                  YR NC ALT-A IO means
                  20- to 30- year fixed-rate Alt-A one- to four-family mortgage loans
                  that
                  have an interest-only period of ten years following origination.
                  The
                  aggregate principal balance of the mortgage loans in each pool
                  is shown on
                  the Trade Ticket under Trade Amount, and is subject to an upward
                  or
                  downward variance by closing of up to 5%. The weighted average
                  per annum
                  interest rate of the mortgage loans in each pool as of the cut-off
                  date is
                  expected to be the percentage shown for the pool under WAC—Final Pool on
                  the Trade Ticket, plus or minus the basis points per annum shown
                  on the
                  Trade Ticket. The weighted average remaining term to stated maturity
                  of
                  the mortgage loans in each pool as of the cut-off date is expected
                  to be
                  the number of months for the pool shown under WAM—Final Pool on the Trade
                  Ticket, plus or minus the number of months shown on the Trade Ticket,
                  except that the number of months can not exceed 180 for a pool
                  of 15 YR
                  REG N/C and 15 YR NC ALT-A mortgage
                  loans or 360 for a pool of 30 YR REG N/C, 30 YR RELO N/C, 30 YR
                  REG N/C IO
                  or 30 YR NC ALT-A mortgage loans. | 
I-1
          | Offered
                  certificates: | Senior
                  class A-PO (the “offered class A-PO certificates”) and subordinated class
                  ▇-▇, ▇-▇ and B-3 certificates (the “offered class B
                  certificates”). | 
If
        there
        is only a single pool of mortgage loans, each class of class A-PO and offered
        class B certificates has a principal balance equal to the percentage for
        the
        class specified under SIZE in the Trade Ticket of the Trade Amount specified
        in
        the Trade Ticket.
      If
        there
        is more than one pool of mortgage loans:
      (a)           The
        offered class A-PO certificates in each “group” (as defined in the Pooling
        Agreement) have a principal balance equal to the percentage for the class
        specified under SIZE for the related pool of the related Trade Amount specified
        in the Trade Ticket, and
      (b)           Each
        class of offered class B certificates has a principal balance equal to the
        aggregate of the principal balance of its component classes. The principal
        balance of a component class of a class of certificates equals the percentage
        for such class specified under SIZE of the Trade Amount, as such SIZE and
        Trade
        Amount are specified for the pool related to the group for the component
        class on the Trade Ticket.
      The
        principal balance of each class of certificates is subject to upward or downward
        variance at closing of up to 5%.
      Class
        A-PO certificates may be composite classes of certificates formed from
        ratio-stripped PO component classes from different pools.
      | Purchase
                  price: | If
                  there is a single pool of mortgage loans, the sum of (a), (b) and
                  (c): | 
(a)             The
        aggregate of the prices of each class of class A-PO and offered class B
        certificates. The price of a class of certificates is calculated by multiplying
        the principal balance of the class at closing by the PRICE INFORMATION
        percentage for the class shown on the Trade Ticket.
      (b)             Accrued
        interest on the aggregate principal balance at closing of each class of offered
        class B certificates from (and including) the ISSUE DATE shown on the Trade
        Ticket to (but excluding) the SETTLEMENT DATE shown on the Trade Ticket at
        a
        rate per annum equal to the target rate stated in the Pooling
        Agreement.
      (c)           $75,000.00.
      I-2
          If
        there
        is more than one pool of mortgage loans, the sum of (d), (e) and
        (f):
      (d)           The
        aggregate, for each pool, of the prices of each class (or component class)
        of
        class A-PO and offered class B certificates listed on the Trade Ticket,
        calculated by multiplying the principal balance at closing of each class
        (or
        component class) of class A-PO and offered class B certificates in the group
        related to the pool (other than any composite classes) by the PRICE INFORMATION
        percentage for the class (or component class) shown for such pool on the
        Trade
        Ticket.
      (e)           accrued
        interest on the aggregate principal balance at closing of the offered class
        B
        certificates from (and including) the ISSUE DATE shown on the Trade Ticket
        to
        (but excluding) the SETTLEMENT DATE shown on the Trade Ticket at a rate per
        annum equal to the target rate for the pool stated in the Pooling
        Agreement.
      (f)           $75,000.00.
      | Originator
                  and Address: | CitiMortgage,
                  Inc. | 
▇▇▇▇
        ▇▇▇▇▇▇▇▇▇▇ ▇▇▇▇▇
      ▇’▇▇▇▇▇▇,
        ▇▇▇▇▇▇▇▇ ▇▇▇▇▇
      | Cut-off
                  date: | The
                  ISSUE DATE shown on the Trade
                  Ticket | 
| Ratings
                    of |  | 
| Class
                    A-PO and offered |  | 
| class
                  B certificates: | Each
                  class of class A-PO and offered class B certificates will have
                  the ratings
                  of the rating agencies shown on the Trade Ticket. “S&P” on the Trade
                  Ticket refers to Standard & Poor’s Ratings Services, “Moody’s” refers
                  to ▇▇▇▇▇’▇ Investors Service, Inc., and “Fitch” refers to Fitch
                  Ratings. | 
| Denominations: | The
                  denominations of each class of class A-PO and class B subordinated
                  certificates will be as set forth in the Prospectus. Such denominations
                  will be set by the Subordinated Underwriter, except that (1) the
                  minimum denomination of each certificate of a class of class A-PO
                  and
                  offered class B certificates will be $1,000, and (2) if the initial
                  principal or notional balance of an offered class of certificates
                  is not a
                  permitted denomination for a certificate of that class, one certificate
                  of
                  the class may be issued in a different
                  denomination. | 
I-3
          | Subordinated
                    Underwriter’s |  | 
| Statements
                    to be Included in |  | 
| the
                  Prospectus: | The
                  purchase price for the class A-PO and offered class B certificates
                  will be
                  set by the underwriter or negotiated by the purchaser and the underwriter
                  at the time of sale. | 
Subject
        to the terms and conditions of the underwriting agreement among Citigroup
        Inc.,
        CMSI and the underwriter, the underwriter will purchase the class A-PO and
        offered class B certificates from CMSI upon issuance. The underwriter has
        committed to purchase all of the class A-PO and offered class B certificates
        if
        any certificates are purchased. The underwriter will distribute the class
        A-PO
        and offered class B certificates from time to time in negotiated transactions
        or
        otherwise at varying prices to be determined at the time of sale.
      In
        connection with the purchase and sale of the class A-PO and offered class
        B
        certificates, the underwriter may be deemed to have received compensation
        from
        CMSI in the form of underwriting discounts.
      In
        connection with this offering, the underwriter may over-allot or effect
        transactions that stabilize or maintain the market price of the class A-PO
        and
        offered class B certificates at a level above that which might otherwise
        prevail
        in the open market. Such stabilizing, if commenced, may be discontinued at
        any
        time.
      | Delivery
                  and Payment: | Same
                  day funds by federal funds wire. | 
| Closing
                  date and Location: | 10:00
                  a.m. (New York City time) on the SETTLEMENT DATE shown on the Trade
                  Ticket
                  at the offices of: | 
Citigroup
        Inc.
      ▇▇▇
        ▇▇▇▇
        ▇▇▇▇▇▇, ▇▇▇ ▇▇▇▇▇
      ▇▇▇
        ▇▇▇▇,
        ▇▇▇ ▇▇▇▇ ▇▇▇▇▇
      I-4
          ATTACHMENT
        A
      [Not
          Included Herein]
A-1