CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP
8-K, 1999-11-12
ASSET-BACKED SECURITIES
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                      SECURITIES AND EXCHANGE COMMISSION

                            Washington, D.C. 20549

                                   Form 8-K

                                CURRENT REPORT

                    Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934


                    Date of Report (Date of earliest Event
                         Reported): November 11, 1999





             CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
            (Exact name of registrant as specified in its charter)


      Delaware                       333-53115                13-3320910
(State or Other Jurisdiction        (Commission            (I.R.S. Employer
   of Incorporation)                File Number)           Identification No.)



  11 Madison Avenue
  New York, New York                                       10010
  (Address of Principal                                  (Zip Code)
   Executive Offices)

Registrant's telephone number, including area code (212) 325-2000
- ------------------------------------------------------------------------------


<PAGE>

Item 5.  Other Events.

Filing of the Trust Agreement

         In connection with the offering of the Credit Suisse First Boston
Mortgage Securities Corp. Mortgage Pass-Through Certificates Series 1999-1, on
October 29, 1999, Credit Suisse First Boston Mortgage Securities Corp. (the
"Depositor") entered into (i) a Trust Agreement dated as of October 29, 1999
(the "Trust Agreement"), by and among the Depositor and The Bank of New York,
as Owner Trustee. The Trust Agreement is annexed hereto as Exhibit 4.1.

Item 7.  Financial Statements, Pro Forma Financial

               (c)  Exhibits

                    The following are filed herewith. The exhibit numbers
               correspond with Item 601 of Regulations S-K.

                    Exhibit No.               Description
                    ----------                -----------
                       4.1                    Trust Agreement

<PAGE>

                                  SIGNATURES


         Pursuant to the requirements of the Securities Exchange Act of 1934,
as amended, the registrant has duly caused this report to be signed on its
behalf by the undersigned hereunto duly authorized.

                                               CREDIT SUISSE FIRST BOSTON
                                                MORTGAGE SECURITIES CORP.



                                                By:  /s/ Steve Katz
                                                     Name:  Steve Katz
                                                     Title: Vice President



Dated:  October 29, 1999

<PAGE>

Exhibit Index


Exhibit
- -------

  4.1                                                  Trust Agreement




             CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.,
                                   Depositor

                                      and

                             THE BANK OF NEW YORK

                                    Trustee


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

                                TRUST AGREEMENT

                         Dated as of October 29, 1999
                        -------------------------------

             Credit Suisse First Boston Mortgage Securities Corp.
                      Mortgage Pass-Through Certificates
                                 Series 1999-1

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

z-----------------------------------------------------------------------------

<PAGE>

<TABLE>
<CAPTION>

                                                 TABLE OF CONTENTS

Section                                                                                                        Page
- -------                                                                                                        ----

<S>                                                                                                            <C>

                                                     ARTICLE I
                                                    DEFINITIONS

         Section 1.01.     Defined Terms..........................................................................1

                                                    ARTICLE II
                   CONVEYANCE OF THE UNDERLYING CERTIFICATES; ORIGINAL ISSUANCE OF CERTIFICATES

         Section 2.01.     Conveyance of the Underlying Certificates..............................................9
         Section 2.02.     Acceptance by Trustee.................................................................10
         Section 2.03.     Representations and Warranties of the Depositor.......................................11
         Section 2.04.     Issuance of Certificates..............................................................12
         Section 2.05.     Miscellaneous REMIC Provisions........................................................12
         Section 2.06.     Presentation for Transfer.............................................................13

                                                    ARTICLE III
                   ADMINISTRATION OF THE TRUST FUND; PAYMENTS AND REPORTS TO CERTIFICATEHOLDERS

         Section 3.01.     Administration of the Trust Fund......................................................14
         Section 3.02.     Certificate Account...................................................................16
         Section 3.03.     Permitted Withdrawals From the Certificate Account....................................16
         Section 3.04.     Distributions.........................................................................16
         Section 3.05.     Statements to Certificateholders......................................................18
         Section 3.06.     Reports of the Trustee; Certificate Accounts..........................................19
         Section 3.07.     Access to Certain Documentation and Information.......................................19

                                                    ARTICLE IV
                                                 THE CERTIFICATES

         Section 4.01.     The Certificates......................................................................20
         Section 4.02.     Registration of Transfer and Exchange of Certificates.................................21
         Section 4.03.     Mutilated, Destroyed, Lost or Stolen Certificates.....................................26
         Section 4.04.     Persons Deemed Owners.................................................................26
         Section 4.05.     Maintenance of Office or Agency.......................................................26

                                                     ARTICLE V
                                                    THE TRUSTEE

         Section 5.01.     Duties of Trustee.....................................................................27
         Section 5.02.     Certain Matters Affecting the Trustee.................................................28
         Section 5.03.     Trustee Not Liable for Certificates...................................................29
         Section 5.04.     Trustee May Own Certificates..........................................................29
         Section 5.05.     Indemnification of the Trustee........................................................29
         Section 5.06.     Eligibility Requirements for the Trustee..............................................30
         Section 5.07.     Resignation and Removal of the Trustee................................................30
         Section 5.08.     Successor Trustee.....................................................................31
         Section 5.09.     Merger or Consolidation of Trustee....................................................31
         Section 5.10.     Appointment of Co-Trustee or Separate Trustee.........................................31
         Section 5.11.     Limited Liability.....................................................................32
         Section 5.12.     SEC Filings...........................................................................32

                                                    ARTICLE VI
                                                   THE DEPOSITOR

         Section 6.01.     Liability of the Depositor............................................................33
         Section 6.02.     Merger, Consolidation or Conversion of the Depositor..................................33
         Section 6.03.     Limitation on Liability of the Depositor and Others...................................33

                                                    ARTICLE VII
                                                    TERMINATION

         Section 7.01.     Termination...........................................................................35
         Section 7.02.     Additional Termination Requirements...................................................36

                                                   ARTICLE VIII
                                             MISCELLANEOUS PROVISIONS

         Section 8.01.     Amendment.............................................................................37
         Section 8.02.     Action Under and Conflicts With the Underlying Agreements.............................38
         Section 8.03.     Recordation of Agreement..............................................................38
         Section 8.04.     Limitation on Rights of Certificateholders............................................38
         Section 8.05.     Governing Law.........................................................................39
         Section 8.06.     Notices...............................................................................39
         Section 8.07.     Severability of Provisions............................................................39
         Section 8.08.     Successors and Assigns................................................................40
         Section 8.09.     Article and Section Headings..........................................................40
         Section 8.10.     Certificates Nonassessable and Fully Paid.............................................40

Signatures


Schedule I   -  List of Underlying Certificates and Underlying Agreement
Exhibit A - Form of Class [A-1][A-2][A-3][A-4][A-5][A-6] Certificate............................................A-1
Exhibit B - Reserved............................................................................................B-1
Exhibit C - Form of Residual Certificate........................................................................C-1
Exhibit D - Form of Reverse of Certificate......................................................................D-1
Exhibit E - Form of Transferor's Affidavit......................................................................E-1
Exhibit F - Form of Transfer Affidavit for the Class R Certificate .............................................F-1

</TABLE>

<PAGE>

     TRUST AGREEMENT, dated as of October 29, 1999, by and between Credit
Suisse First Boston Mortgage Securities Corp., as depositor (the "Depositor"),
and The Bank of New York, as trustee (the "Trustee").

                             W I T N E S S E T H:

     WHEREAS, the Depositor and the Trustee desire to enter into a trust
agreement dated as of the date hereof (the "Trust Agreement");

     NOW THEREFORE, in consideration of the mutual agreements herein
contained, the Depositor and the Trustee agree as follows:

                                   ARTICLE I

                                  DEFINITIONS

     Section 1.01. Defined Terms. Whenever used in this Agreement, the
following words and phrases, unless the context otherwise requires, shall have
the following meanings:

     Accretion Termination Date: The Distribution Date on which the
Certificate Principal Balance of the Class A-4 Certificates has been reduced
to zero.

     Accrual Distribution Amount: The amount of accrued interest on the Class
A-5 Certificates that is added to the Certificate Principal Balance thereof
pursuant to Section 3.04(d).

     Agreement: This Trust Agreement and all amendments hereof and supplements
hereto.

     Available Funds: As of any date of determination and with respect to any
Class of Certificates, the (i) aggregate of all amounts received by the
Trustee on and prior to such Distribution Date as distributions on the
Underlying Certificates, reduced by (ii) the sum of (a) any amounts or
expenses payable or reimbursable to the Trustee from the Trust Fund hereunder
(including without limitation pursuant to Section 5.05), (b) any taxes imposed
upon the Trust and (c) any expenses reimbursable to the Depositor.

     Book-Entry Certificate. Any Certificate registered in the name of the
Depository or its nominee which shall initially include the Class A-1, Class
A-2, Class A-3, Class A-4, Class A-5 and Class A-6 Certificates.

     Book-Entry Underlying Certificate. Any Underlying Certificate registered
in the name of the Depository or its nominee.

     Business Day: Any day other than (i) a Saturday or a Sunday, or (ii) a
day on which banks in the State of New York are authorized or obligated by law
to be closed.

     Certificate: Any one of the Class A-1, Class A-2, Class A-3, Class A-4,
Class A-5, Class A-6 and Class R Certificates, executed and countersigned by
the Trustee substantially in the forms attached hereto.

     Certificate Account: The account established with respect to the Trust
Fund, which shall at all times be an Eligible Account, created and maintained
by the Trustee pursuant to Section 3.02. Funds deposited in the Certificate
Account shall be held in trust for the related Certificateholders for the uses
and purposes set forth in this Agreement.

     Certificateholder or Holder: The person in whose name a Certificate is
registered in the Certificate Register, except that neither a Disqualified
Organization nor a Non-U.S. Person shall be a Holder of a Residual Certificate
for any purpose hereof and, solely for the purpose of giving any consent
pursuant to this Agreement, any Certificate registered in the name of the
Depositor or any Affiliate thereof shall be deemed not to be outstanding and
the Voting Rights to which it is entitled shall not be taken into account in
determining whether the requisite percentage of Voting Rights necessary to
effect any such consent has been obtained, except as otherwise provided in
Section 9.01. All references herein to "Holders" or "Certificateholders" shall
reflect the rights of Certificate Owners as they may indirectly exercise such
rights through the Depository and participating members thereof, except as
otherwise specified herein; provided, however, that the Trustee shall be
required to recognize as a "Holder" or "Certificateholder" only the Person in
whose name a Certificate is registered in the Certificate Register.

     Certificate Owner: With respect to a Book-Entry Certificate, the Person
who is the beneficial owner of such Certificate, as reflected on the books of
an indirect participating brokerage firm for which a Depository Participant
acts as agent, if any, and otherwise on the books of a Depository Participant,
if any, and otherwise on the books of the Depository.

     Certificate Principal Balance: As to any Principal Distribution Date and
each Class of Certificates, the Initial Certificate Principal Balance of such
Class, less all amounts distributed to Holders of such Class on previous
Distribution Dates on account of principal pursuant to Section 3.04.

     Certificate Register: The register maintained pursuant to Section
4.02(a).

     Class: All Certificates bearing the same designation as set forth in
Section 4.01 hereof.

     Class A Certificates: Any one of the Class A-1, Class A-2, Class A-3,
Class A-4, Class A-5 or Class A-6 Certificates.

     Class A-1 Certificates, Class A-2 Certificates, Class A-3 Certificates,
Class A-4 Certificates, Class A-5 Certificates, Class A-6 Certificates: The
Certificates executed and countersigned by the Trustee substantially in the
form set forth in Exhibit A hereto.

     Class A-6 Amount: As to any Distribution Date, the lesser of (i) the
Certificate Principal Balance of the Class A-6 Certificates and (ii) the
product of (1) the Scheduled Percentage, (2) the Class A-6 Percentage and (3)
the amount of Available Funds allocable to principal.

     Class A-6 Percentage: As to any Distribution Date, the fraction,
expressed as a percentage, the numerator of which is equal to the Certificate
Principal Balance of the Class A-6 Certificates and the denominator of which
is equal to the aggregate Certificate Principal Balances of all the
Certificates.

     Class R Certificate: The Certificate executed and countersigned by the
Trustee substantially in the form set forth in Exhibit C hereto.

     Closing Date: October 29, 1999.

     Code: The Internal Revenue Code of 1986, as amended.

     Corporate Trust Office: The principal corporate trust office of the
Trustee in the State of New York at which at any particular time its corporate
trust business with respect to this Agreement shall be administered, which
office at the date of the execution of this Agreement is located at 101
Barclay Street - 12E, New York, New York 10286.

     Depositor: Credit Suisse First Boston Mortgage Securities Corp., a
Delaware corporation, or its successors in interest.

     Depository: The Depository Trust Company, or any successor Depository
hereafter named. The nominee of the initial Depository for purposes of
registering those Certificates that are to be Book-Entry Certificates is Cede
& Co. The Depository shall at all times be a "clearing corporation" as defined
in Section 8-102(3) of the Uniform Commercial Code of the State of New York
and a "clearing agency" registered pursuant to the provisions of Section 17A
of the Securities Exchange Act of 1934, as amended.

     Depository Participant: A broker, dealer, bank or other financial
institution or other Person for whom from time to time a Depository effects
book-entry transfers and pledges of securities deposited with the Depository.

     Definitive Certificate: Any definitive, fully registered Certificate.

     Disqualified Organization: Means the United States, any state or
political subdivision thereof, any foreign government, any international
organization, any agency or instrumentality if all of its activities are
subject to tax and a majority of its board of directors is not selected by
such governmental entity), any cooperative organization furnishing electric
energy or providing telephone service to persons in rural areas as described
in Code Section 1381(a)(2)(C), or any organization (other than a farmers'
cooperative described in Code Section 521) that is exempt from federal income
tax unless such organization (other than a farmers' cooperative described in
Code Section 521) that is exempt from federal income tax unless such
organization is subject to the tax on unrelated business income imposed by
Code Section 511.

     Distribution Date: The second Business Day following the 25th day of each
calendar month beginning on November 29, 1999.

     Eligible Account: A segregated account that is (i) an account or accounts
maintained with a federal or state chartered depository institution or trust
company the short-term unsecured debt obligations of which (or, in the case of
a depository institution or trust company that is the principal subsidiary of
a holding company, the short-term unsecured debt obligations of such holding
company) are rated P-1 by Moody's and A-1 by Standard & Poor's (or comparable
ratings if Moody's and Standard & Poor's are not the Rating Agencies) at the
time any amounts are held on deposit therein, (ii) an account or accounts the
deposits in which are fully insured by the Federal Deposit Insurance
Corporation (to the limits established by such corporation), the uninsured
deposits in which account are otherwise secured such that, as evidenced by an
opinion of counsel delivered to the Trustee and to each Rating Agency, the
Certificateholders will have a claim with respect to the funds in such account
or a perfected first priority security interest against such collateral (which
shall be limited to Permitted Investments) securing such funds that is
superior to claims of any other depositors or creditors of the depository
institution with which such account is maintained, (iii) a trust account or
accounts maintained with the trust department of a federal or state chartered
depository institution, national banking association or trust company acting
in its fiduciary capacity or (iv) otherwise acceptable to each Rating Agency
without reduction or withdrawal of their then current ratings of the
Certificates as evidenced by a letter from each Rating Agency to the Trustee.

     ERISA: The Employee Retirement Income Security Act of 1974, as amended.

     Initial Certificate Principal Balance: With respect to each Class of
Certificates, the aggregate principal balance of such Class on the Closing
Date as set forth in Section 4.01 hereof.

     Interest Accrual Period: As to any Distribution Date, the calendar month
preceding such Distribution Date.

     Interest Shortfall: As to any Distribution Date, and Class of
Certificates the amount, if any, by which the amount distributed to holders of
such Class (or added to the Certificate Balance thereof, with respect to the
Class A-5 Certificates) on such Distribution Date is less than the Optimal
Interest Distribution Amount for such Class and Distribution Date.

     Investment Company Act: The Investment Company Act of 1940, as amended.

     Majority in Interest: As to any Class of Certificates, the Holders of
Certificates of such Class evidencing, in the aggregate, at least 51% of the
Percentage Interests evidenced by all Certificates of such Class.

     Non-Registered Certificate: A Certificate other than a Registered
Certificate.

     Non-U.S. Person: Means an individual, corporation, partnership or other
person other than a citizen or resident of the United States, a corporation or
partnership (including an entity treated as a corporation or partnership for
U.S. federal income tax purposes) created or organized in or under the laws of
the United States, any state thereof or the District of Columbia (except, in
the case of a partnership, Treasury regulations are adopted that provide
otherwise), an estate that is subject to U.S. federal income tax regardless of
the source of its income, or a trust if a court within the United States is
able to exercise primary supervision of the administration of the trust and
one or more United States persons have the authority to control all
substantial decisions of the trust.

     Officers' Certificate: A certificate signed by the Chairman of the Board,
the President or a Vice President or Assistant Vice President and by the
Treasurer, the Secretary or one of the Assistant Treasurers or Assistant
Secretaries of the Depositor as required by this Agreement.

     Opinion of Counsel: A written opinion of counsel, who may be counsel for
the Depositor or in-house counsel for a Person that is a transferor or
transferee in respect of a Transfer of a Certificate, which opinion is
reasonably acceptable to the Trustee; provided, however, that any opinion of
counsel relating to (i) the qualification of any account required to be
maintained pursuant to this Agreement as an Eligible Account or (ii) the
qualification of the Trust Fund, as a REMIC or compliance with the REMIC
Provisions, shall be an opinion of independent counsel.

     Optimal Interest Distribution Amount: For any Class with respect to any
Distribution Date, one month's interest at the Pass-Through Rate on the
Certificate Principal Balance of such Class of Certificates less such Class's
Prepayment Interest Shortfall Amount for such Distribution Date (but in no
event less than zero).

     Ownership Interest: As to any Certificate, any ownership interest in such
Certificate including any interest in such Certificate as the Holder thereof
and any other interest therein, whether direct or indirect, legal or
beneficial as owner or pledgee.

     Outstanding: With respect to the Certificates as of any date of
determination, all Certificates theretofore executed and countersigned under
this Agreement except:

          (i) Certificates theretofore cancelled by the Trustee or delivered
     to the Trustee for cancellation; and

          (ii) Certificates in exchange for which or in lieu of which other
     Certificates have been executed and delivered by the Trustee pursuant to
     this Agreement.

     Pass-Through Rate: With respect to any Distribution Date, 6.75%.

     Percentage Interest: With respect to any Certificate, the "Denomination"
thereof set forth in such Certificate divided by the aggregate Initial
Certificate Principal Balance of the related Class of Certificates.

     Permitted Investments: At any time, any one or more of the following
obligations and securities: certificates of deposit, demand or time deposit,
federal funds or bankers' acceptances issued by any depository institution or
trust company incorporated under the laws of the United States or of any state
thereof and subject to and subject to supervision and examination by federal
and/or state banking authorities, provided that the commercial paper and/or
long-term unsecured debt obligations of such depository institution or trust
company (or in the case of the principal depository institution in a holding
company system, the commercial paper or long-term unsecured debt obligations
of such holding company) are then rated in the highest rating category for
such securities.

     Permitted Transferee: Shall mean (i) the United States, any State or
political subdivision thereof, or any agency or instrumentality of any of the
foregoing, (ii) a foreign government, International Organization or any agency
or instrumentality of either of the foregoing, (iii) an organization (except
certain farmers' cooperatives described in section 521 of the Code) which is
exempt from tax imposed by Chapter 1 of the Code (including the tax imposed by
section 511 of the Code on unrelated business taxable income) on any excess
inclusions (as defined in section 860E(c)(l) of the Code) with respect to any
Residual Certificate, (iv) rural electric and telephone cooperatives described
in section 1381(a)(2)(C) of the Code, (v) a Person that is not a citizen or
resident of the United States, a corporation or partnership (including an
entity treated as a corporation or partnership for U.S. federal income tax
purposes) created or organized in or under the laws of the United States, any
State thereof or the District of Columbia (except, in the case of a
partnership, Treasury regulations are adopted that provide otherwise), an
estate whose income from sources without the United States is includible in
gross income for United States federal income tax purposes regardless of its
connection with the conduct of a trade or business within the United States,
or a trust if a court within the United States is able to exercise primary
supervision over the administration of the trust and one or more United States
persons have the authority to control all substantial decisions of the trust
unless such Person has furnished the transferor and the Trustee with a duly
completed Internal Revenue Service Form 4224 or any applicable successor form,
and (vi) any other Person so designated by the Depositor based upon an Opinion
of Counsel that the Transfer of an Ownership Interest in a Class R
Certificates to such Person may cause the REMIC hereunder to fail to qualify
as a REMIC at any time that the Certificates are outstanding. The terms
"United States," "State" and "International Organization" shall have the
meanings set forth in section 7701 of the Code or successor provisions. A
corporation will not be treated as an instrumentality of the United States or
of any State or political subdivision thereof for these purposes if all of its
activities are subject to tax and, with the exception of the Federal Home Loan
Mortgage Corporation, a majority of its board of directors is not selected by
such government unit.

     Person: Any individual, corporation, partnership, limited partnership,
joint venture, bank, limited liability company, association joint-stock
company, trust (including any beneficiary thereof), unincorporated
organization or government or any agency or political subdivision thereof.

     Plan: Pension, profit sharing or other employee benefit or other plans
(such as individual retirement accounts) that are subject to Title I of ERISA
or to Section 4975 of the Code.

     Prepayment Interest Shortfall: For any Underlying Remittance Date, with
respect to a Mortgage Loan which was the subject of a prepayment in full or in
part, the difference between (a) one month's interest on such Mortgage Loan,
and (b) the amount of interest actually paid by the related mortgagor.

     Rating Agencies: Standard & Poor's, a division of The McGraw-Hill
Companies, Inc., or its successors and assigns and Fitch IBCA, Inc. or its
successors or assigns.

     Record Date: With respect to the first Distribution Date the Closing
Date. With respect to any other Distribution Date, the last Business Day of
the month preceding the month in which such Distribution Date occurs.

     Regular Certificates: The Class A-1, Class A-2, Class A-3, Class A-4,
Class A-5, Class A-6 Certificates.

     REMIC: A "real estate mortgage investment conduit" within the meaning of
Section 860D of the Code. The Class A-1, Class A-2, Class A-3, Class A-4,
Class A-5 and Class A-6 Certificates will constitute "regular interests" in
the REMIC and the Class R Certificates will constitute the sole class of
"residual interests" in the REMIC.

     REMIC Provisions: Provisions of the federal income tax law relating to
real estate mortgage investment conduits, which appear at Sections 860A
through 860G of Subchapter M of Chapter 1 of the Code, and related provisions,
and regulations and rulings promulgated thereunder, as the foregoing may be in
effect from time to time, as well as provisions of applicable state laws.

     Residual Certificate: The Class R Certificate.

     Responsible Officer: When used with respect to the Trustee, an officer of
the Trustee assigned to the Corporate Trust Office, including any Vice
President, any Assistant Vice President, any Assistant Secretary, any trust
officer or any other officer of the Trustee customarily performing functions
similar to those performed by any of the above-designated officers and also,
with respect to a particular matter, to whom such matter is referred because
of such officer's knowledge of and familiarity with the particular subject and
who shall have direct responsibility for the administration of this Agreement.

     Rule 3a-7: Rule 3a-7 of the Investment Company Act, as then in effect (or
any successor rule).

     Scheduled Percentage: As to any Distribution Date will equal the
percentage set forth below:

<TABLE>
<CAPTION>

    Distribution Date Occurring In                                           Scheduled Percentage
    ------------------------------                                           --------------------

    <S>                                                                      <C>

    November 1999 through October 2004...............................                 0%
    November 2004 through October 2005...............................                30%
    November 2005 through October 2006...............................                40%
    November 2006 through October 2007...............................                60%
    November 2007 through October 2008...............................                80%
    November 2008 and thereafter.....................................               100%

</TABLE>

     Securities Intermediary: The meaning specified in Section 8-102(a)(14) of
the UCC.

     Start-up Day: With respect to the REMIC, the day designated as such
pursuant to Section 2.05(b).

     Tax Matters Person: The Person or Persons designated from time to time to
act as the "tax matters person" (within the meaning of the REMIC Provisions)
of the REMIC.

     Tax Returns: The federal income tax return on Internal Revenue Service
Form 1066, U.S. Real Estate Mortgage Investment Conduit Income Tax Return,
including Schedule Q thereto, Quarterly Notice to Residual Interest Holders of
REMIC Taxable Income or Net Loss Allocation, or any successor forms, to be
filed on behalf of the REMIC due to its classification as a REMIC under the
REMIC Provisions, together with any and all other information, reports or
returns that may be required to be furnished to the Certificateholders or
filed with the Internal Revenue Service or any other governmental taxing
authority under any applicable provisions of federal, state or local tax laws.

     Transfer: Any direct or indirect transfer, sale pledge, hypothecation or
other form of assignment of any Ownership Interest in a Certificate.

     Transfer Affidavit: A certificate substantially in the form of Exhibit F
hereto.

     Transferee: Any Person who is acquiring by Transfer any Ownership
Interest in a Certificate.

     Transferor Affidavit: A certificate substantially in the form of Exhibit
E hereto.

     Trustee: The Bank of New York, a New York banking corporation and its
successors and any corporation resulting from or surviving any consolidation
or merger to which it or its successors may be a party and any successor
trustee at the time serving as successor trustee hereunder.

     Trustee Fee: Any investment income on the amounts on deposit in the
Certificate Account.

     Trust Fund: The corpus of the trust created by this Agreement and
evidenced by the related Certificates, consisting of: (i) the related
Underlying Certificates, (ii) all distributions thereon on and after the
Closing Date, (iii) the Certificate Account and such assets as are deposited
therein from time to time, and (iv) any net proceeds from the investment of
amounts on deposit in the Certificate Account, together, in each case, with
any and all income, proceeds and payments with respect thereto.

     UCC: The Uniform Commercial Code as in effect in the State of New York as
of the date hereof.

     Underlying Agreements: As set forth on Schedule I hereto.

     Underlying Certificates: The certificates identified on Schedule 1
hereto.

     Underlying Remittance Date: With respect to the Underlying Certificates,
the 25th day of each month, or, if such is not a business day (as defined in
the related Underlying Agreement), the next succeeding business day).

     Underlying Trust Fund: The trust fund relating to the Underlying
Certificates.

     Underlying Trustee: With respect to each of the Underlying Certificates,
the trustee under the Underlying Agreement.

     Unpaid Interest Shortfall: As to any Distribution Date and any Class, the
amount, if any, by which the aggregate of the Interest Shortfalls for prior
Distribution Dates exceeds the aggregate of the amounts distributed on prior
Distribution Dates to holders of such Class of Certificates as reimbursement
for such Interest Shortfalls.

<PAGE>

                                  ARTICLE II

                  CONVEYANCE OF THE UNDERLYING CERTIFICATES;
                       ORIGINAL ISSUANCE OF CERTIFICATES

     Section 2.01. Conveyance of the Underlying Certificates. The Depositor,
concurrently with the execution and delivery hereof, does hereby transfer,
convey, sell and assign to the Trustee, on behalf of the Holders of the
Certificates, without recourse, all the right, title and interest of the
Depositor in and to the Underlying Certificates with appropriate endorsements
and other documentation sufficient under the Underlying Agreements to transfer
the Underlying Certificate to the Trustee, including all distributions thereon
payable after the related Underlying Remittance Date in October 1999 with
appropriate endorsements and other documentation sufficient under the
Underlying Agreements to transfer such Underlying Certificates to the Trustee,
and agrees to transfer to the Trustee promptly upon receipt (by wire transfer
of immediately available funds), any amounts payable thereon after the
Underlying Remittance Dates in October 1999 and all proceeds of the foregoing.

     The transfer of the Underlying Certificates and all other assets
constituting the Trust Fund is absolute and is intended by the parties hereto
as a sale. Except to the extent required to have the Underlying Certificates
reregistered in its own name or a nominee name, the Trustee shall have the
beneficial ownership interest in the Underlying Certificates to be registered
with the Depository in the name of the Securities Intermediary for the account
of the Trustee and shall not assign, sell, dispose of or transfer any interest
in the Underlying Certificates or any other asset constituting the Trust Fund
or permit the Underlying Certificates or any other asset constituting the
Trust Fund to be subjected to any lien, claim or encumbrance arising by,
through or under the Trustee or any person claiming by, through or under the
Trustee. The Depositor agrees to provide to the Trustee all documents required
for the transfer to the Trustee of the beneficial ownership interest in the
Underlying Certificate and the Trustee is hereby authorized and directed to
execute such documents.

     It is intended that the conveyance of the Underlying Certificates by the
Depositor to the Trustee as provided in this Section be, and be construed as,
a sale of the Underlying Certificates by the Depositor to the Trustee for the
benefit of the Certificateholders. It is, further, not intended that such
conveyance be deemed a pledge of the Underlying Certificates by the Depositor
to the Trustee to secure a debt or other obligation of the Depositor. However,
in the event that the Underlying Certificates are held to be the property of
the Depositor, or if for any reason this Agreement is held or deemed to create
a security interest in the Underlying Certificates, then it is intended that
(a) this Agreement shall also be deemed to be a security agreement within the
meaning of Articles 8 and 9 of the New York Uniform Commercial Code and the
corresponding articles of the Uniform Commercial Code of any other applicable
jurisdiction; (b) the conveyance provided for in this Section shall be deemed
to be a grant by the Depositor to the Trustee for the benefit of the
Certificateholders of a security interest in all of the Depositor's right,
title and interest, whether now owned or hereafter acquired, in and to (A) the
Underlying Certificates, (B) all amounts payable to the holders of the
Underlying Certificates after the Closing Date in accordance with the terms
thereof and (C) all proceeds of the conversion, voluntary or involuntary, of
the foregoing into cash, instruments, securities or other property, including
without limitation all amounts from time to time held or invested in the
Certificate Account, whether in the form of cash, instruments, securities or
other property; (c) the registration of the beneficial ownership interest in
the Underlying Certificates with the Depository in the name of the Securities
Intermediary for the account of the Trustee and the possession by the Trustee
or its agent of such other items of property as constitute instruments, money,
negotiable documents or chattel paper shall be deemed to be "possession by the
secured party" or possession by a purchaser or a person designated by such
secured party, for purposes of perfecting the security interest pursuant to
the New York Uniform Commercial Code and the Uniform Commercial Code of any
other applicable jurisdiction (including, without limitation, Section 9-305,
8-313 or 8-321 thereof); and (d) notifications to persons holding such
property, and acknowledgments, receipts or confirmations from persons holding
such property, shall be deemed notifications to, or acknowledgments, receipts
or confirmations from, financial intermediaries, bailees or agents (as
applicable) of the Trustee for the purpose of perfecting such security
interest under applicable law. The Depositor and the Trustee, at the
Depositor's direction and expense, 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 Underlying
Certificates and other assets constituting the Trust Fund described above,
such security interest would be deemed to be a perfected security interest of
first priority under applicable law and will be maintained as such throughout
the term of the Agreement.

     Section 2.02. Acceptance by Trustee. The Trustee hereby confirms that it
has confirmation from The Bank of New York, as Securities Intermediary for the
Trustee that (i) the Book-Entry Underlying Certificates have been confirmed by
the Depository to have been delivered to the Trustee, subject to no other
interests, and held in the Securities Intermediary in book-entry form, as a
participant in the Depository and (ii) the Securities Intermediary is holding
such Book-Entry Underlying Certificates for the account of the Trustee, as
owner of the Underlying Certificates as trustee for the Certificateholders.
The Trustee declares that it shall hold ownership interest in the Underlying
Certificates in trust, upon the terms herein set forth, for the use and
benefit of all present and future Certificateholders. The Trustee agrees, for
the benefit of Certificateholders, to confirm that the class designation and
original principal balance conform to the information set forth in respect of
the Underlying Certificates on Schedule I within 10 days after execution and
delivery of this Agreement. If in the course of such confirmation the Trustee
finds that the information on any Underlying Certificate does not conform to
the related information set forth on Schedule I, the Trustee shall promptly so
notify the Depositor. The Depositor shall promptly correct or cure such defect
within 45 days from the date it was notified of such omission or defect and,
if the Depositor does not correct or cure such omission or defect within such
period, the Depositor shall purchase the Underlying Certificates from the
Trustee on the Distribution Date in the month following the month in which
such 45-day period expired at the Purchase Price of the Underlying
Certificate. The Purchase Price for the purchased Underlying Certificate shall
be deposited in the Certificate Account on such date for distribution to
Certificateholders and, upon receipt by the Trustee of such deposit, the
Trustee shall cause the Securities Intermediary to hold any such repurchased
Underlying Certificate which is a Book-Entry Underlying Certificate for the
account of the Depositor and shall take such other action as shall be
necessary to vest in the Depositor or its designee any Underlying Certificate
released pursuant hereto. It is understood and agreed that the obligation of
the Depositor to purchase any Underlying Certificate as to which a defect or
omission exists shall constitute the sole remedy against the Depositor
respecting such defect or omission available to Certificateholders or the
Trustee on behalf of Certificateholders.

     Section 2.03. Representations and Warranties of the Depositor. The
Depositor hereby represents and warrants to the Trustee as of the Closing Date
as follows:

     (a) With respect to each of the Underlying Certificates:

          (i) the Depositor is the sole owner of the Underlying Certificate
     free and clear of any lien, pledge, charge or encumbrance of any kind;

          (ii) the Depositor has not assigned any interest in the Underlying
     Certificate or any distributions thereon, except as contemplated herein;
     and

          (iii) the documents furnished to the Trustee in connection with the
     Underlying Certificate are sufficient to effect the transfer of the
     Underlying Certificate to the Trustee.

     The representations and warranties set forth in this Section 2.03(a)
shall survive the transfer and assignment of the Underlying Certificates. Upon
discovery by the Depositor or a Responsible Officer of the Trustee of a breach
of any of the foregoing representations and warranties which materially and
adversely affects the interests of the Certificateholders in any of the
Underlying Certificates, the Depositor or the Trustee shall give prompt
written notice to the other and to the Certificateholders. On or prior to the
Distribution Date in October 2001, the Depositor shall cure such breach in all
material respects or, if such breach cannot be cured, the Depositor shall
repurchase each affected Underlying Certificate from the Trustee if the
Depositor is so directed by Holders of a Majority in Interest of the related
Class or Classes of Regular Certificates. Any such repurchase of an Underlying
Certificate by the Depositor shall be accomplished prior to the related
Distribution Date, in any calendar month at a price (the "Purchase Price")
equal to the principal balance of such Underlying Certificate on the related
Underlying Remittance Date (prior to giving effect to any distributions on
such Underlying Remittance Date pursuant to the related Underlying Agreement)
plus interest thereon at the Pass-Through Rate from the first day of the month
of such repurchase up to but not including the date of such repurchase. The
payment of the Purchase Price shall be considered a prepayment in full of each
such repurchased Underlying Certificate and shall be delivered to the Trustee
for deposit in the Certificate Account in accordance with the provisions of
Section 3.02 hereof. Upon such deposit into such Certificate Account, the
repurchased Underlying Certificate shall be released to the Depositor, and the
Trustee shall execute and deliver such instruments of transfer or assignment,
in each case without recourse, as shall be reasonably requested and provided
by the Depositor to vest in the Depositor, or its designee or assignee, title
to the Underlying Certificate repurchased pursuant hereto. The obligation of
the Depositor to cure or repurchase the Underlying Certificate shall
constitute the sole remedy respecting such breach available to
Certificateholders or the Trustee on behalf of Certificateholders.

     (b) With respect to the Depositor:

          (i) The Depositor is a corporation duly organized, validly existing
     and in good standing under the laws of the State of Delaware with full
     power and authority to execute, deliver and perform this Agreement.

          (ii) This Agreement has been duly authorized, executed and delivered
     by the Depositor and constitutes the legal, valid and binding agreement
     of the Depositor, enforceable in accordance with its terms, except as
     enforcement hereof may be limited by bankruptcy, insolvency,
     reorganization, moratorium or other similar laws now or hereafter in
     effect relating to or affecting creditors' rights generally or by general
     principles of equity, regardless of whether such enforceability is
     considered in a proceeding in equity or at law.

          (iii) Neither the execution nor the delivery of this Agreement nor
     the issuance, delivery and sale of the Certificates, nor the consummation
     of any other of the transactions contemplated herein nor the fulfillment
     of the terms of this Agreement or the Certificates will result in the
     breach of any term or provision of the charter or by-laws of the
     Depositor or conflict with, result in a breach, violation or acceleration
     of or constitute a default under, the terms of any material indenture or
     other agreement or instrument to which the Depositor is a party or by
     which it is bound, or any statute, order or regulation applicable to the
     Depositor of any court, regulatory body, administrative agency or
     governmental body having jurisdiction over the Depositor.

          (iv) 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 (A)
     asserting the invalidity of this Agreement or the Certificates, (B)
     seeking to prevent the issuance of the Certificates or the consummation
     of any of the transactions contemplated by this Agreement, or (C) which
     might materially and adversely affect the validity or enforceability of
     this Agreement or the Certificates.

     It is understood and agreed that the representations and warranties set
forth in this Section 2.03(b) shall survive delivery of the Trust Fund to the
Trustee. Upon discovery by the Depositor or a Responsible Officer of the
Trustee of a breach of any of the foregoing representations and warranties
which breach materially and adversely affects the interests of the
Certificateholders, the party discovering such breach shall give prompt
written notice to the other party and to the Rating Agency.

     Section 2.04. Issuance of Certificates. The Trustee acknowledges the
receipt by it of the Underlying Certificates and concurrently with such
receipt, the Trustee has duly executed, countersigned and delivered, to or
upon the order of the Depositor, the Certificates in authorized denominations
and registered in such names as the Depositor has directed in writing.

     Section 2.05. Miscellaneous REMIC Provisions. (a) The Class A-1, Class
A-2, Class A-3, Class A-4, Class A-5 and Class A-6 Certificates are hereby
designated as "regular interests," and the Class R Certificates are hereby
designated as the single class of "residual interests," in the REMIC for
purposes of Sections 860G(a)(1) and 860G(a)(2) of the Code.

     (b) The Closing Date will be the "Start-up Day" of the REMIC within the
meaning of Section 860G(a)(9) of the Code.

     (c) The Holder of the Class R Certificate, is hereby designated as the
"tax matters person" of the REMIC within the meaning of Section 6231(a)(7) of
the Code. The Holder of the Class R Certificate, by its acceptance of such
Certificate, shall be deemed to have agreed to the appointment of the Trustee
as its agent in performing the functions of "tax matters person."

     Section 2.06. Presentation for Transfer. The Trustee shall present the
documents described in Section 2.01 for registration of transfer of the
Underlying Certificates, pursuant to the requirements under the respective
Underlying Agreements, to the respective Underlying Trustees, immediately
following the Closing Date.

<PAGE>

                                 ARTICLE III

                       ADMINISTRATION OF THE TRUST FUND;
                  PAYMENTS AND REPORTS TO CERTIFICATEHOLDERS

     Section 3.01. Administration of the Trust Fund. (a) It is intended that
the Trust Fund formed hereunder shall constitute, and that the affairs of the
Trust Fund shall be conducted so as to qualify as, a REMIC as defined in and
in accordance with the REMIC Provisions. In furtherance of such intention, the
Trustee covenants and agrees that it shall act as the agent of the Trust Fund
(and the Trustee is hereby appointed to act as such agent), and that in such
capacity it shall: (i) prepare and file, or cause to be prepared and filed, in
a timely manner, and sign, any Tax Returns required by the REMIC Provisions
and other applicable income tax laws, using a calendar year as the taxable
year for the REMIC; (ii) make or cause to be made an election, on behalf of
the REMIC, to be treated as a REMIC on the Tax Return of the REMIC for its
first taxable year, in accordance with the REMIC Provisions; (iii) prepare,
file, deliver and sign any and all Tax Returns, information statements or
other forms required to be delivered to any governmental taxing authority
(including, without limitation, within 30 days after the Closing Date,
Internal Revenue Service Form 8811, "Information Return for Real Estate
Mortgage Investment Conduits (REMICs) and Issuers of Collateralized Debt
Obligations"), or to any Certificateholder, pursuant to any applicable
federal, state or local tax laws with respect to the Trust Fund or the related
Certificates and the transactions contemplated by this Agreement; (iv) provide
to each of the related Certificateholders such data necessary for their
original issue discount computations and market discount computations with
respect to such Certificates for federal income tax purposes and such
information as such Certificateholders may reasonably request from time to
time; (v) conduct the affairs of the Trust Fund so as to maintain the status
thereof as a REMIC under the REMIC Provisions; (vi) not knowingly or
intentionally take any action or omit to take any action that would cause the
termination of the REMIC status of the Trust Fund; (vii) provide information
necessary for the computation of tax imposed on the transfer of a Residual
Certificate to a Holder who is not a Permitted Transferee or an agent
(including a broker, nominee or other middleman) of a Person who is not a
Permitted Transferee or a pass-through entity in which a Person who is not a
Permitted Transferee is the record holder of an interest, provided that the
reasonable cost of computing and furnishing such information shall be charged
to the Person liable for such tax; (viii) maintain records relating to the
REMIC, including but not limited to the income, expenses, assets and
liabilities of the REMIC, and the fair market value and adjusted basis of the
assets included in the REMIC determined at such intervals as may be required
by the Code and as may be necessary to prepare the foregoing returns,
schedules, statements or information; and (ix) as and when necessary and
appropriate, represent the REMIC in any administrative or judicial proceedings
relating to an examination or audit by any governmental taxing authority,
request an administrative adjustment as to any taxable year of the REMIC,
enter into settlement agreements with any governmental taxing agency, extend
any statute of limitations relating to any tax item of the REMIC, and
otherwise act on behalf of the REMIC in relation to any tax matter or
controversy involving the REMIC; provided, however, that the Trustee shall
have no liability for any failure by it to perform its obligations under this
Section 3.01(a) if the information or data necessary to perform such
obligations has not been provided to the Trustee, unless such failure to
perform results solely from the negligence or bad faith of the Trustee.

     (b) In the event that any federal, state or local tax (including a tax on
"prohibited transactions" as defined in Section 860F of the Code) is imposed
on the REMIC and is not otherwise paid pursuant to this provision of the
Agreement, such tax shall be charged first against amounts otherwise
distributable to the Holders of the Residual Certificates and then against
amounts otherwise distributable to the Holders of the Regular Certificates.
The Trustee is hereby authorized to retain from amounts otherwise
distributable to the related Certificateholders sufficient funds to pay or
provide for the payment of, and to actually pay, such tax as is legally owed
by the REMIC (but such authorization shall not prevent the Trustee from
contesting any such tax in appropriate proceedings, and withholding payment of
such tax, if permitted by law, pending the outcome of such proceedings); in
addition, upon the direction of the Holders of a Majority in Interest of the
Residual Certificates the Trustee shall institute, conduct and terminate
appropriate proceedings to contest any such tax, provided that the Holders of
a Majority in Interest of the Residual Certificates shall indemnify the
Trustee for all expenses, costs and liabilities arising from any such action.

     (c) Notwithstanding the provisions of paragraph (b) above, the Holders of
the Residual Certificates, shall pay on written demand, and shall indemnify
and hold harmless the Trustee and the related REMIC from and against, any and
all federal, state and local taxes, including taxes on "prohibited
transactions" as defined in Section 860F of the Code (including, for this
purpose, any and all interest, penalties, fines and additions to tax, as well
as any and all reasonable counsel fees and out-of-pocket expenses incurred in
contesting the imposition of such tax) imposed on the REMIC. Such
indemnification shall survive the termination of the Agreement and the REMIC
created hereby.

     (d) In connection with its receipt of any distribution on the Underlying
Certificates on any Underlying Remittance Date, the Trustee shall verify the
principal or interest, as applicable, through a factor line or by other public
information systems established and customarily relied upon for such purpose
and shall confirm that the principal or interest payment received on such date
is equal to the distribution amount reflected on such factor line or other
information system. If (i) the amount of any distribution varies from the
amount reflected on such factor line or other information system for such
distribution, (ii) the Trustee shall not have received a distribution by the
close of business on the date on which such distribution was to be received by
the Trustee, or (iii) a Responsible Officer of the Trustee shall gain actual
knowledge of any default under the related Underlying Agreement, the Trustee
shall promptly notify the Depositor and the Certificateholders, and shall
proceed in accordance with the provisions of Section 8.02.

     (e) The Depositor, upon request, shall promptly furnish the Trustee with
all such information as may be reasonably required in connection with the
Trustee's preparation of all Tax Returns of the REMIC or to enable the Trustee
to respond to reasonable requests for information made by related
Certificateholders in connection with tax matters.

     Section 3.02. Certificate Account. (a) The Trustee, for the benefit of
the Certificateholders, shall establish and maintain an account (the
"Certificate Account"), which shall be an Eligible Account, entitled "Credit
Suisse First Boston Mortgage Securities Corp. Mortgage Pass-Through
Certificates, Series 1999-1". The Trustee shall upon receipt deposit in the
Certificate Account the following payments and collections in respect of the
related Underlying Certificates:

          (i) all distributions received on the Underlying Certificates
     subsequent to the Closing Date; and

          (ii) any amount required to be deposited in the Certificate Account
     pursuant to Section 2.02 or 2.03(a) hereof in connection with the
     repurchase of an Underlying Certificate by the Depositor.

     The foregoing requirements for deposit in the Certificate Accounts shall
be exclusive. The Trustee shall give notice to the Depositor of the location
of the Certificate Account upon establishment thereof and prior to any change
thereof.

     (b) Upon a determination by the Trustee that the final distribution shall
be made in respect of an Underlying Certificate, the Trustee shall take such
steps as may be necessary in connection with the final payment thereon in
accordance with the terms and conditions of the related Underlying Agreement.
The Trustee shall promptly deposit in the Certificate Account the final
distribution received upon presentment and surrender of the affected
Underlying Certificate.

     Section 3.03. Permitted Withdrawals From the Certificate Account. The
Trustee may from time to time withdraw funds from the Certificate Account for
the following purposes:

          (i) to make payments to Certificateholders in the amounts and in the
     manner provided in Section 3.04;

          (ii) to reimburse the Depositor for expenses incurred by and
     reimbursable to the Depositor with respect to the REMIC pursuant to
     Section 6.03;

          (iii) to pay any taxes imposed upon the REMIC, as provided in
     Section 3.01(b);

          (iv) to clear and terminate the Certificate Account upon the
     termination of the Trust Fund; and

          (v) to pay to itself the Trustee Fee.

     Section 3.04. Distributions. (a) (i) On each Distribution Date, the
Trustee shall withdraw from the Certificate Account all Available Funds
consisting of amounts equal to (i) the aggregate of all amounts received by
the Trustee on and prior to such Distribution Date as distributions on the
Underlying Certificates, reduced by (ii) the sum of (a) any amounts or
expenses payable or reimbursable to the Trustee from the Trust Fund hereunder
(including without limitation pursuant to Section 5.05), (b) any taxes imposed
upon the Trust and (c) any expenses payable or reimbursable to the Depositor.
The Trustee will then distribute such Available Funds (in each case to the
extent of the remaining Available Funds) as follows.

     On each Distribution Date, the Available Funds will be distributed as
follows:

     (i) to each Class of Certificates, (other than the Class A-5
Certificates, until the Accretion Termination Date as set forth in Section
3.04 (d)), from amounts received in respect of interest on the Underlying
Certificates, pro rata, interest accrued on the respective principal balances
thereof during the preceding Interest Accrual Period at the related
Pass-Through Rate, together with any accrued and unpaid interest from prior
Distribution Dates;

     (ii) to the Class A-4 Certificates in reduction of the Certificate
Principal Balance thereof, the Accrual Distribution Amount, until the
Certificate Principal Balance thereof has been reduced to zero; and

     (iii) to each Class of Certificates in reduction of the Certificate
Principal Balance thereof, from amounts received in respect of principal on
the Underlying Certificates, sequentially, as follows:

          (A)  to the Class A-6 Certificates, the Class A-6 Amount;

          (B)  to the Class R Certificates, until the Certificate Principal
               Balance thereof has been reduced to zero;

          (C)  concurrently, as follows:

                    (i) 47.4405113606%, sequentially to the Class A-1
               Certificates and then to the Class A-2 Certificates, until the
               respective Certificate Principal Balances thereof have been
               reduced to zero;

                    (ii) 52.5594886394% to the Class A-3 Certificates, until
               the Certificate Principal Balance thereof has been reduced to
               zero;

          (D)  to the Class A-4 Certificates, until the Certificate Principal
               Balance thereof has been reduced to zero;

          (E)  to the Class A-5 Certificates, until the Certificate Principal
               Balance thereof has been reduced to zero; and

          (F)  to the Class A-6 Certificates , until the Certificate Principal
               Balance thereof has been reduced to zero.

     In the event that on any Underlying Remittance Date, the Trustee shall
not have received the cash distribution, if any, required to be made under an
Underlying Agreement in respect of an Underlying Certificate, the Trustee
shall effect the distribution set forth in subsections (i) through (iii) above
on the Business Day immediately following the date on which the cash
distribution so required to be made in respect of such Underlying Certificate
shall have been received by the Trustee.

     (b) All distributions made with respect to each Class of Certificates on
each Distribution Date shall be allocated pro rata among the Outstanding
Certificates of such Class based upon their respective Percentage Interests.
Payments to the Certificateholders of such Class with respect to each
Distribution Date will be made to the Certificateholders of record as of the
related Record Date (other than as provided in Section 7.01 respecting the
final distribution). Distributions to any Certificateholder on any
Distribution Date shall be made by wire transfer of immediately available
funds to the account of such Certificateholder at a bank or other entity
having appropriate facilities therefor, if such Certificateholder shall have
so notified the Trustee in writing at least five Business Days prior to the
related Record Date, or in such other manner as shall be agreed to by the
Trustee and such Certificateholder, or otherwise by check mailed by first
class mail to the address of such Certificateholder appearing in the
Certificate Register. The final distribution on each Certificate will be made
in like manner, but only upon presentment and surrender of such Certificate at
the Corporate Trust Office or such other location specified in the notice to
Certificateholders of such final distribution.

     (c) The rights of the Certificateholders to receive distributions from
the proceeds of the related Trust Fund in respect of the Certificates, and all
interests of the Certificateholders in such distributions, shall be as set
forth in this Agreement. Neither the Holders of any Class of Certificates nor
the Depositor nor the Trustee shall in any way be responsible or liable to
Holders of any other Class of Certificates in respect of amounts properly
previously distributed on the Certificates.

     (d) On each Distribution Date preceding the Accretion Termination Date,
an amount equal to the amount of accrued interest on the Class A-5
Certificates for such date will be added to the Certificate Principal Balance
thereof, and such amount will be distributed to the holders of the Class A-4
Certificates in reduction of the Certificate Principal Balance thereof, until
the Certificate Principal Balance thereof has been reduced to zero. On the
Accretion Termination Date the accrued interest on the Class A-5 Certificates
for such date will be payable to the holders of the Class A-4 Certificates as
a distribution of principal until the Certificate Principal Balance thereof
has been reduced to zero, any such amount will be added to the Certificate
Principal Balance of the Class A-5 Certificates. Any remaining amount of
accrued interest will be paid to the holders of the Class A-5 Certificates as
a distribution of interest. Any amount so added to the Certificate Principal
Balance of the Class A-5 Certificates will thereafter accrue interest at a
rate of 6.75% per annum.

     (e) On or prior to the Accretion Termination Date the amount that is
added to the Certificate Principal Balance of the Class A-5 Certificates
pursuant to Section 3.04(d) in respect of accrued interest on such
Distribution Date will be reduced by the amount by which accrued interest on
such class at the Pass-Through Rate on such Distribution Date exceeds the
amount allocated thereto pursuant to Section 3.04(a)(i). This reduction will
correspond to a reduction in the amount available to be distributed in respect
of principal on the applicable Distribution Date to the holders of the Class
A-4 Certificates to the extent such Certificates would have been entitled to
such amounts.

     Section 3.05. Statements to Certificateholders. Concurrently with each
distribution on a Distribution Date, the Trustee will forward by mail (or if
requested by any Certificateholder, by facsimile transmission) to the holder
of each Certificate a statement generally setting forth the following
information with respect to the Underlying Trust Fund to which such
Certificate relates :

          (i)  the Available Funds for such Distribution Date;

          (ii) with respect to each Class of Certificates, the Realized Losses
               allocated to such Class with respect to such Distribution Date;

          (iii) with respect to such Distribution Date, the aggregate amount
               of principal and interest, stated separately, distributed to
               holders of each Class of Certificates;

          (iv) with respect to such Distribution Date, the amount of any
               Interest Shortfall for each Class of Certificates, together
               with the amount of any Unpaid Interest Shortfall for such Class
               immediately following such Distribution Date;

          (v)  the Certificate Principal Balance of each Class of
               Certificates, after giving effect to distributions of principal
               of such Certificates on such Distribution Date; and

          (vi) the amount distributed to the holders of the Class R
               Certificates on such Distribution Date.

     In the case of the information furnished pursuant to clauses (ii), (iv)
and (vi) above, the amounts shall also be expressed as a dollar amount per
single Certificate of the applicable Class.

     In addition, the Trustee will furnish to Certificateholders copies of the
statements received by the Trustee for each Underlying Remittance Date as the
holder of the Underlying Certificates on behalf of the Trust Fund.

     Within a reasonable period of time after the end of each calendar year,
the Trustee will prepare and deliver by first class mail to each person who at
any time during the previous calendar year was a Certificateholder of record a
statement containing the information required to be contained in the regular
monthly report to Certificateholders, as set forth in clause (iv) above,
aggregated (other than the aggregate Unpaid Interest Shortfall) for such
calendar year or the applicable portion thereof during which such person was a
Certificateholder. Such obligation of the Trustee shall be deemed to have been
satisfied to the extent that substantially comparable information shall be
provided by the Trustee pursuant to any requirements of the Code, the REMIC
Provisions and regulations thereunder as from time to time are in force.

     Upon the written request of a Certificateholder and at the expense of
such Certificateholder, the Trustee shall furnish to such Certificateholder
such periodic, special, or other reports or information, whether or not
provided for in the Trust Agreement, as shall be necessary, reasonable or
appropriate with respect to the Certificateholder, or otherwise with respect
to the purposes of the Trust Agreement, all such reports or information to be
provided by and in accordance with such applicable instructions and directions
as the Certificateholder may reasonably require and at the expense of such
Certificateholders. For purposes of this Section 3.05, the Trustee's duties
are limited to the extent that adequate information is reasonably available to
the Trustee as described herein.

     Section 3.06. Reports of the Trustee; Certificate Accounts. Upon written
request of a Certificateholder and at the expense of such Certificateholder,
the Trustee shall make available to Certificateholders within 15 days after
the date of receipt of such request a statement setting forth the status of
the Certificate Account as of the close of business on the last day of the
calendar month immediately preceding such request, and showing, for the period
covered by such statement, the aggregate of deposits into and withdrawals from
the Certificate Account.

     Section 3.07. Access to Certain Documentation and Information. The
Trustee shall provide the related Certificateholders with access to a copy of
each report, if any, received by it as Underlying Certificateholder under the
Underlying Agreements. The Trustee shall also provide the Depositor with
access to any such report and to all written reports, documents and records
required to be maintained by the Trustee in respect of its duties hereunder.
Such access shall be afforded without charge but only upon reasonable request
evidenced by prior written notice received by the Trustee two Business Days
prior to the date of such proposed access and during normal business hours at
offices designated by the Trustee.

<PAGE>

                                  ARTICLE IV

                               THE CERTIFICATES

     Section 4.01. The Certificates. (a) The Certificates shall be
substantially in the respective forms set forth in Exhibits A, C and D hereto.
The Certificates shall, on original issue, be executed and countersigned by
the Trustee, not in its individual capacity but solely as Trustee, and
delivered by the Trustee to or upon the written order of the Depositor upon
receipt by the Trustee of the Underlying Certificates and any other documents
specified in Section 2.01.

     (b) The Initial Certificate Principal Balance of each Class of
Certificate shall be:

                                            Initial Certificate
                 Class                       Principal Balance
           ----------------                 --------------------
           A-1 Certificates                   $    83,253,000

           A-2 Certificates                   $     5,067,000

           A-3 Certificates                   $    97,850,000

           A-4 Certificates                   $    25,000,000

           A-5 Certificates                   $    23,519,000

           A-6 Certificates                   $    26,076,525

           R Certificate                      $           100

     The Class A-1, Class A-2, Class A-3, Class A-4, Class A-5 and Class A-6
Certificates shall initially be issued as one or more Certificates registered
in the name of the Depository or its nominee and, except as provided below,
registration of such Certificates may not be transferred by the Trustee except
to another Depository that agrees to hold such Certificates for the respective
Certificate Owners with Ownership Interests therein. The Certificateholders
shall hold their respective Ownership Interests in and to each of such
Certificates through the book-entry facilities of the Depository and, except
as provided below, shall not be entitled to Definitive Certificates in respect
of such Ownership Interests. All transfers by Certificate Owners of their
respective Ownership Interests in the Book-Entry Certificates shall be made in
accordance with the procedures established by the Depository Participant or
brokerage firm representing such Certificate Owner. Each Depository
Participant shall transfer the Ownership Interests only in the Book-Entry
Certificates of Certificate Owners it represents or of brokerage firms for
which it acts as agent in accordance with the Depository's normal procedures.

     The Trustee may for all purposes (including the making of payments due on
the respective Classes of Book-Entry Certificates) deal with the Depository as
the authorized representative of the Certificate Owners with respect to the
respective Classes of Book-Entry Certificates for the purposes of exercising
the rights of Certificateholders hereunder. The rights of Certificate Owners
with respect to the respective Classes of Book-Entry Certificates shall be
limited to those established by law and agreements between such Certificate
Owners and the Depository Participants and brokerage firms representing such
Certificate Owners. Multiple requests and directions from, and votes of, the
Depository as Holder of any Class of Book-Entry Certificates with respect to
any particular matter shall not be deemed inconsistent if they are made with
respect to different Certificate Owners. The Trustee may establish a
reasonable record date in connection with solicitations of consents from or
voting by Certificateholders and shall give notice to the Depository of such
record date.

     If (i)(A) the Depositor advises the Trustee in writing that the
Depository is no longer willing or able to properly discharge its
responsibilities as Depository and (B) the Depositor is unable to locate a
qualified successor or (ii) the Depositor at its option advises the Trustee in
writing that it elects to terminate the book-entry system through the
Depository, or (iii) after an Event of Default under the Trust Agreement, the
Certificate Owners representing not less than 51% of the Certificate Balance
of the Book-Entry Certificates advise the Trustee and DTC that the book-entry
system is no longer in the best interests of such Certificate Owners, the
Trustee shall notify all Certificate Owners, through the Depository, of the
occurrence of any such event and of the availability of Definitive
Certificates to Certificate Owners requesting the same. Upon surrender to the
Trustee of the Book-Entry Certificates by the Depository, accompanied by
registration instructions from the Depository for registration of transfer,
the Trustee shall issue the Definitive Certificates. Neither the Depositor nor
the Trustee shall be liable for any actions taken by the Depository or its
nominee, including, without limitation, any delay in delivery of such
instructions and may conclusively rely on, and shall be protected in relying
on, such instructions. Upon the issuance of Definitive Certificates the
Trustee shall recognize the Holders of the Definitive Certificates as
Certificateholders hereunder.

     Section 4.02. Registration of Transfer and Exchange of Certificates. (a)
The Trustee shall cause to be kept at the office of its designated agent in
the City of New York, a Certificate Register in which, subject to such
reasonable regulations as it may prescribe, the Trustee shall provide for the
registration of Certificates and of transfers and exchanges of Certificates as
herein provided.

     (b) No transfer of a Residual Certificate or any interest therein shall
be made and the Trustee shall not register any proposed transfer of a Residual
Certificate unless it receives (i) a representation substantially to the
effect that the proposed transferee is not a Plan, is not acquiring the
Residual Certificate on behalf of or with the assets of a Plan (including
assets that may be held in an insurance company's separate or general accounts
where assets in such accounts may be deemed "plan assets" for purposes of
ERISA), or (ii) an opinion of counsel in form and substance satisfactory to
the Trustee and the Depositor that the purchase or holding of the Residual
Certificate by or on behalf of a Plan will not constitute a prohibited
transaction and will not result in the assets of the Underlying Trust being
deemed to be "plan assets" and subject to the fiduciary responsibility
provisions of ERISA or the prohibited transaction provisions of ERISA and the
Code or any federal, state or local law that impose similar requirements or
subject the Underlying Trustee or the Depositor of the Underlying Trust to any
obligation in addition to those undertaken in the Underlying Trust Agreement.

     (c) Each purchaser of a Class A Certificate shall be deemed to represent
by its acceptance of such Certificate that (i) it is not a Plan or a person
investing on behalf of or with assets of a Plan, or (ii) its acquisition of
the Class A Certificate is covered by Prohibited Transaction Class Exemption
("PTE") 84-14, which exempts certain transactions effected on behalf of a Plan
by an "in-house asset manager," PTE 90-1, which exempts certain transactions
between insurance company pooled separate accounts and parties in interest,
PTE 91-38, which exempts certain transactions between bank collective
investment funds and parties in interest, PTE 95-60, which exempts certain
transactions between insurance company general accounts and parties in
interest, PTE 96-23, which exempts certain transactions effected on behalf of
a Plan by a "qualified professional asset manager," or a similar exemption,
and also satisfies the conditions for application of the underwriter's
exemption granted to the underwriter of the Underlying Certificates with
respect to the Underlying Certificates.

     (d) The Certificates and related documentation may be amended or
supplemented from time to time by the Depositor, without the consent but upon
notice to the Trustee and the Holders of the Certificates, to modify the
restrictions on and procedures for resale and other Transfers of the
Certificates to reflect any change in applicable law or regulation (or the
interpretation thereof) or in practices relating to the resale or other
Transfer of restricted securities generally, if the Depositor and the Trustee
shall have received an Opinion of Counsel to the effect that such amendment or
supplement is necessary or appropriate.

     (e) (i) Each Person who has or who acquires any Ownership Interest in a
Residual Certificate shall be deemed by the acceptance or acquisition of such
Ownership Interest to have agreed to be bound by the following provisions and
to have irrevocably authorized the Trustee or its designee under clause
(iii)(A) below to deliver payments to a Person other than such Person and to
negotiate the terms of any mandatory sale under clause (iii)(B) below and to
execute all instruments of Transfer and to do all other things necessary in
connection with any such sale. The rights of each Person acquiring any
Ownership Interest in a Residual Certificate are expressly subject to the
following provisions:

          (A)  Each Person holding or acquiring any Ownership Interest in a
               Residual Certificate shall be a Permitted Transferee and shall
               promptly notify the Trustee of any change or impending change
               in its status as a Permitted Transferee.

          (B)  In connection with any proposed Transfer of any Ownership
               Interest in a Residual Certificate, the Trustee shall require
               delivery to it, and shall not register the Transfer of any
               Residual Certificate until its receipt of, an affidavit (a
               "Transfer Affidavit" attached hereto as Exhibit F) from the
               proposed Transferee, representing and warranting, among other
               things, that such Transferee is a Permitted Transferee, that it
               is not acquiring its Ownership Interest in the Residual
               Certificate that is the subject of the proposed Transfer as a
               nominee, trustee or agent for any Person that is not a
               Permitted Transferee, that for so long as it retains its
               Ownership Interest in a Residual Certificate, it will endeavor
               to remain a Permitted Transferee, and that it has reviewed the
               provisions of this Section 4.02(e) and agrees to be bound by
               them.

          (C)  Notwithstanding the delivery of a Transfer Affidavit by a
               proposed Transferee under clause (B) above, if a Responsible
               Officer of the Trustee who is assigned to this transaction has
               actual knowledge that the proposed Transferee is not a
               Permitted Transferee, no Transfer of an Ownership Interest in a
               Residual Certificate to such proposed Transferee shall be
               effected.

          (D)  Each Person holding or acquiring any Ownership Interest in a
               Residual Certificate shall agree (x) to require a Transfer
               Affidavit (in the form attached hereto as Exhibit F) from any
               other Person to whom such Person attempts to transfer its
               Ownership Interest in a Residual Certificate and (y) not to
               transfer its Ownership Interest unless it provides a Transferor
               Affidavit (in the form attached hereto as Exhibit E) to the
               Trustee stating that it has no actual knowledge that such other
               Person is not a Permitted Transferee.

          (E)  Each Person holding or acquiring an Ownership Interest in a
               Residual Certificate, by purchasing an Ownership Interest in
               such Certificate, agrees to give the Trustee written notice
               that it is a "pass-through interest holder" within the meaning
               of temporary Treasury regulation Section 1.67-3T(a)(2)(i)(A)
               immediately upon acquiring an Ownership Interest in a Residual
               Certificate, if it is, or is holding an Ownership Interest in a
               Residual Certificate on behalf of, a "pass-through interest
               holder."

               (ii) The Trustee will register the Transfer of any Residual
          Certificate only if it shall have received the Transfer Affidavit
          and all of such other documents as shall have been reasonably
          required by the Trustee as a condition to such registration. In
          addition, no Transfer of a Residual Certificate shall be made unless
          the Trustee shall have received a representation letter from the
          Transferee of such Certificate to the effect that such Transferee is
          a Permitted Transferee.

               (iii) (A) If any purported Transferee shall become a Holder of
          a Residual Certificate in violation of the provisions of this
          Section 4.02(d), then the last preceding Permitted Transferee shall
          be restored, to the extent permitted by law, to all rights as Holder
          thereof retroactive to the date of registration of such Transfer of
          such Residual Certificate. The Trustee shall be under no liability
          to any Person for any registration of Transfer of a Residual
          Certificate that is in fact not permitted by this Section 4.02(d) or
          for making any payments due on such Certificate to the Holder
          thereof or for taking any other action with respect to such Holder
          under the provisions of this Agreement.

               (B)  If any purported Transferee shall become a Holder of a
                    Residual Certificate in violation of the restrictions in
                    this Section 4.02(d) and to the extent that the
                    retroactive restoration of the rights of the holder of
                    such Residual Certificate as described in clause (iii)(A)
                    above shall be invalid, illegal or unenforceable, then the
                    Trustee shall have the right, without notice to the Holder
                    or any prior Holder of such Residual Certificate, to sell
                    such Residual Certificate to a purchaser selected by the
                    Trustee on such terms as the Trustee may choose. Such
                    purported Transferee shall promptly endorse and deliver
                    each Residual Certificate in accordance with the
                    instructions of the Trustee. Such purchaser may be the
                    Trustee itself or any Affiliate of the Trustee. The
                    proceeds of such sale, net of the commissions (which may
                    include commissions payable to the Trustee or its
                    Affiliates), expenses and taxes due, if any, will be
                    remitted by the Trustee to such purported Transferee. The
                    terms and conditions of any sale under this clause
                    (iii)(B) shall be determined in the sole discretion of the
                    Trustee, and the Trustee shall not be liable to any Person
                    having an Ownership Interest in a Residual Certificate as
                    a result of its exercise of such discretion.

               (iv) The Trustee shall make available to the Internal Revenue
          Service and those Persons specified by the REMIC Provisions all
          information necessary to compute any tax imposed (A) as a result of
          the Transfer of an Ownership Interest in a Residual Certificate to
          any Person who is a Disqualified Organization, including the
          information described in Treasury regulations sections
          1.860D-1(b)(5) and 1.860E-2(a)(5) with respect to the "excess
          inclusions" of such Residual Certificate and (B) as a result of any
          regulated investment company, real estate investment trust, common
          trust fund, partnership, trust, estate or organization described in
          Section 1381 of the Code that holds an Ownership Interest in a
          Residual Certificate having as among its record holders at any time
          any Person which is a Disqualified Organization. Reasonable
          compensation for providing such information may be accepted by the
          Trustee.

               (v) The provisions of this Section 4.02(d) set forth prior to
          this subsection (v) may be modified, added to or eliminated,
          provided that there shall have been delivered to the Trustee at the
          expense of the party seeking to modify, add to or eliminate any such
          provision the following:

               (A) written notification from each Rating Agency to the effect
          that the modification, addition to or elimination of such provisions
          will not cause such Rating Agency to downgrade its then-current
          ratings of any Class of Certificates; and

               (B) an Opinion of Counsel, in form and substance satisfactory
          to the Trustee, to the effect that such modification of, addition to
          or elimination of such provisions will not cause the REMIC created
          hereunder to cease to qualify as a REMIC and will not cause the
          REMIC created hereunder to be subject to an entity-level tax caused
          by the Transfer of any Residual Certificate to a Person that is not
          a Permitted Transferee or (y) a Person other than the prospective
          transferee to be subject to a REMIC-tax caused by the Transfer of a
          Residual Certificate to a Person that is not a Permitted Transferee.

     (f) The restrictions on Transfers of Residual Certificates set forth in
Section 4.02(d) shall cease to apply to Transfers occurring after delivery to
the Trustee of an Opinion of Counsel, which Opinion of Counsel shall not be an
expense of the Depositor or the Trustee, to the effect that the elimination of
such restrictions will not cause the Trust Fund to fail to qualify as a REMIC
at any time that the related Certificates are outstanding or result in the
imposition of any tax on the Trust Fund, a Certificateholder or another
Person. Each Person holding or acquiring any Ownership Interest in the Class R
Certificate hereby consents to any amendment of this Agreement which, based on
an Opinion of Counsel furnished to the Trustee, is reasonably necessary (a) to
ensure that the record ownership of, or any beneficial interest in, a Class R
Certificate is not transferred, directly or indirectly, to a Person that is
not a Permitted Transferee and (b) to provide for a means to compel the
Transfer of a Class R Certificate which is held by a Person that is not a
Permitted Transferee to a Holder that is a Permitted Transferee.

     The preparation and delivery of all certificates and opinions referred to
above in this Section 4.02 in connection with transfer shall be at the expense
of the parties to such transfers.

     (g) Subject to the foregoing, upon surrender for registration of Transfer
of any Certificate at the Corporate Trust Office, the Trustee shall execute,
countersign and deliver, in the name of the designated transferee or
transferees, one or more new Certificates in authorized denominations and of
the same Class and aggregate Percentage Interest.

     (h) At the option of the Certificateholders, Certificates may be
exchanged for other Certificates of authorized denominations and of the same
Class and aggregate Percentage Interest upon surrender of the Certificates to
be exchanged at the office maintained pursuant to Section 4.05. Whenever any
Certificates are so surrendered for exchange, the Trustee shall execute,
countersign and deliver the Certificates that the Certificateholder making the
exchange is entitled to receive. Each Certificate presented or surrendered for
registration of Transfer or exchange shall (if so required by the Trustee) be
duly endorsed by, or be accompanied by a written instrument of transfer in the
form satisfactory to the Trustee duly executed by, the Holder thereof or his
attorney duly authorized in writing.

     (i) No service charge shall be made for any registration of Transfer or
exchange of Certificates of any Class, but the Trustee may require payment of
a sum sufficient to cover any tax or governmental charge that may be imposed
in connection with any Transfer or exchange of Certificates.

     (j) All Certificates surrendered for registration of Transfer and
exchange shall be cancelled and disposed of by the Trustee in accordance with
its standard procedures without liability on its part.

     (k) Upon written request, the Trustee will provide to the Depositor a
list of names and addresses of all Certificateholders as they appear in the
Certificate Register.

     The Trustee shall have no obligation or duty to monitor, determine or
inquire as to compliance with any restrictions on transfer imposed under this
Agreement or under applicable law with respect to any transfer of any interest
in any Certificate (including any transfers between or among Certificate
Owners or beneficial owners of interests in any book-entry or global
certificates) other than to require delivery of such certificates and other
documentation or evidence as are expressly required by, and to do so if and
when expressly required by the terms of this Agreement, and to examine the
same to determine substantial compliance as to form with the express
requirements hereof.

     Section 4.03. Mutilated, Destroyed, Lost or Stolen Certificates. If (i)
any mutilated Certificate is surrendered to the Trustee or the Trustee
receives evidence to its satisfaction of the destruction, loss or theft of any
Certificate and of the ownership thereof, and (ii) there is delivered to the
Trustee and the Depositor such security or indemnity as may be required by
them to save them harmless, then, in the absence of notice to the Trustee that
such Certificate has been acquired by a bona fide purchaser, the Trustee shall
execute and deliver, in exchange for or in lieu of any such mutilated,
destroyed, lost or stolen Certificate, a new Certificate of like Class, tenor
and Percentage Interest. In connection with the issuance of any new
Certificate under this Section 4.03, the Trustee may require the payment of a
sum sufficient to cover any tax or other governmental charge that may be
imposed in relation thereto and any other expenses (including the fees and
expenses of the Trustee) connected therewith. Any replacement Certificate
issued pursuant to this Section 4.03 shall constitute complete and
indefeasible evidence of ownership of a like denomination as if originally
issued, whether or not the lost, stolen or destroyed Certificate shall be
found at any time. All Certificates surrendered to the Trustee under the terms
of this Section 4.03 shall be cancelled and disposed of by the Trustee in
accordance with its standard procedures without liability on its part.

     Section 4.04. Persons Deemed Owners. The Trustee and the Depositor and
any agent of either of them may treat the Person in whose name any Certificate
is registered as the owner of such Certificate for the purpose of receiving
distributions pursuant to Section 3.04 and for all other purposes whatsoever,
and neither the Trustee, the Depositor nor any such agent shall be affected by
notice to the contrary.

     Section 4.05. Maintenance of Office or Agency. The Trustee will maintain
at its expense in the Borough of Manhattan, City of New York, State of New
York, an office or agency where Certificates may be surrendered for
registration of transfer or exchange and presented for final distribution and
where notices and demands to or upon the related Trust Fund in respect of the
Certificates and this Agreement may be served. Such office or agency shall
initially be maintained at 101 Barclay Street - 12E, New York, New York 10286.
The Trustee will give prompt written notice to the Certificateholders and the
Depositor of any change in the location of any such office or agency.

<PAGE>

                                  ARTICLE V

                                  THE TRUSTEE

     Section 5.01. Duties of Trustee. The Trustee shall undertake to perform
such duties and only such duties as are specifically set forth in this
Agreement. Any permissive right of the Trustee set forth in this Agreement
shall not be construed as a duty.

     The Trustee, upon receipt of all resolutions, certificates, statements,
opinions, reports, documents, orders or other instruments furnished to the
Trustee that are specifically required to be furnished pursuant to any
provision of this Agreement shall examine them to determine whether they
conform to the requirements of this Agreement (but need not confirm or
investigate the accuracy of mathematical calculations or other facts stated
therein).

     No provision of this Agreement shall be construed to relieve the Trustee
from liability for its own negligent action, its own negligent failure to act
or its own misconduct, or its negligent failure to act in respect of the Trust
Fund or the Underlying Certificates, or any liability which would be imposed
by reason of its willful misfeasance or bad faith; provided, however, that:

          (i) The duties and obligations of the Trustee shall be determined
     solely by the express provisions of this Agreement, the Trustee shall not
     be liable except for the performance of such duties and obligations as
     are specifically set forth in this Agreement, no implied covenants or
     obligations shall be read into this Agreement against the Trustee and the
     Trustee may conclusively rely, as to the truth of the statements and the
     correctness of the opinions expressed therein, upon any certificates or
     opinions furnished to the Trustee which conform to the requirements of
     this Agreement and which are reasonably believed to be genuine and duly
     executed by the proper authorities respecting matters hereunder;

          (ii) The Trustee shall not be individually or as Trustee liable for
     an error of judgment made in good faith by a Responsible Officer or
     Responsible Officers of the Trustee, unless it shall be proved that the
     Trustee was negligent or acted in bad faith or with willful misfeasance
     in performing its duties in accordance with the terms of this Agreement;
     and

          (iii) The Trustee shall not be liable, individually or as Trustee,
     with respect to any action taken, suffered or omitted to be taken by it
     in good faith in accordance with the direction of the Holders of
     Certificates of any Class of Certificates evidencing Percentage Interests
     in such Class aggregating not less than 25% relating to the time, method
     and place of conducting any proceeding for any remedy available to the
     Trustee, or exercising any trust or power conferred upon the Trustee,
     under this Agreement.

     Section 5.02. Certain Matters Affecting the Trustee. (a) Except as
otherwise provided in Section 5.01:

          (i) The Trustee may request and conclusively rely upon and shall be
     protected in acting or refraining from acting upon any resolution,
     Officers' Certificate, certificate of auditors or any other certificate,
     statement, instrument, opinion, report, notice, request, consent, order,
     appraisal, bond or other paper or document reasonably believed by it to
     be genuine and to have been signed or presented by the proper party or
     parties;

          (ii) The Trustee may consult with counsel of its selection and the
     advice of such counsel or any Opinion of Counsel shall be full and
     complete authorization and protection in respect of any action taken or
     suffered or omitted by it hereunder in good faith and in accordance
     therewith;

          (iii) The Trustee shall not be liable, individually or as Trustee,
     for any action taken, suffered or omitted by it in good faith and
     believed by it to be authorized or within the discretion or rights or
     powers conferred upon it by this Agreement;

          (iv) The Trustee shall not be bound to make any investigation into
     the facts or matters stated in any resolution, certificate, statement,
     instrument, opinion, report, notice, request, consent, order, approval,
     bond or other paper or document, unless requested in writing to do so by
     the Holders of Certificates of any Class evidencing Percentage Interests
     in such Class aggregating not less than 25%;

          (v) The Trustee may execute any of the trusts or powers hereunder or
     perform any duties hereunder either directly or by or through agents or
     attorneys and the Trustee shall not be responsible for any misconduct or
     negligence on the part of any agent or attorney appointed with due care
     by it hereunder;

          (vi) The Trustee shall be liable for any loss on any investment of
     funds pursuant to this Agreement;

          (vii) The Trustee shall not be required to expend or risk its own
     funds or otherwise incur any financial liability in the performance of
     any of its duties or in the exercise of any of its rights or powers
     hereunder if it shall have reasonable grounds for believing that
     repayment of such funds or adequate indemnity against such liability is
     not assured to it;

          (viii) The Trustee shall be under no obligation to exercise any of
     the trusts or powers vested in it by this Agreement or to make any
     investigation of matters arising hereunder or to institute, conduct or
     defend any litigation hereunder or in relation hereto at the request,
     order or direction of any of the Certificateholders, pursuant to the
     provisions of this Agreement, unless such Certificateholders shall have
     offered to the Trustee reasonable security or indemnity against the
     costs, expenses and liabilities which may be incurred therein or thereby;

          (ix) Whenever in the administration of this Agreement the Trustee
     shall deem it desirable that a matter be proved or established prior to
     taking, suffering or omitting any action hereunder, the Trustee (unless
     other evidence be herein specifically prescribed) may, in the absence of
     bad faith on its part, conclusively rely upon an Officers' Certificate;
     and

          (x) The Trustee shall not be deemed to have notice of any breach by
     the Depositor of any representation, warranty or covenant or any default
     or event of default unless a Responsible Officer of the Trustee has
     actual knowledge thereof or unless written notice of any event which is
     in fact such a default or breach is received by the Trustee at the
     Corporate Trust Office of the Trustee, and such notice references the
     Certificates and this Agreement.

     (b) All rights of action under this Agreement or under any of the
Certificates, enforceable by the Trustee, may be enforced by it without the
possession of any of the Certificates, or the production thereof at the trial
or other proceeding relating thereto, and any such suit, action or proceeding
instituted by the Trustee shall be brought in its name for the benefit of all
the Holders of the Certificates, subject to the provisions of this Agreement.

     Section 5.03. Trustee Not Liable for Certificates. The recitals contained
herein and in the Certificates, other than the signature of the Trustee on the
Certificates, shall be taken as the statements of the Depositor and the
Trustee assumes no responsibility for their correctness. The Trustee makes no
representations or warranties as to the validity or sufficiency of this
Agreement or of the Certificates or of the Underlying Certificates or related
documents, other than the signature of the Trustee on the Certificates. The
Trustee shall not be accountable for the use or application by the Depositor
of any of the Certificates or of the proceeds of such Certificates, or for the
use or application of any funds paid to the Depositor in respect of the
Underlying Certificates.

     Section 5.04. Trustee May Own Certificates. The Trustee in its individual
or any other capacity may become the owner or pledgee of Certificates with the
same rights it would have if it were not Trustee.

     Section 5.05. Indemnification of the Trustee. The Depositor hereby
covenants and agrees to indemnify the Trustee and any director, officer,
employee, or agent of the Trustee, or to the extent such indemnity obligation
is not satisfied by the Depositor, by the Trust Fund, and to hold them
harmless against, any and all losses, liabilities, damages, claims or expenses
(other than those expenses incurred in the ordinary course of business)
arising out of or in connection with the acceptance or administration of the
trust or trusts hereunder (including, without limitation, any losses,
liabilities, damages, claims or expenses arising from the failure of the
Depositor to perform its obligations in accordance with the provisions of this
Agreement or of defending itself against any claim or liability in connection
with the exercise or performance of any powers or duties hereunder), other
than those resulting from the negligence, willful misconduct or bad faith in
the performance of any of the Trustee's duties hereunder or under the
Underlying Agreements, but only if and for so long as The Bank of New York is
such trustee. If the Depositor fails to satisfy such indemnity obligation, the
Trust Fund shall indemnify and hold the Trustee harmless to the same extent as
the Depositor as provided above. Any loss, liability or expense incurred by
the Trustee and indemnified by the Trust Fund shall reduce the amount of
Available Funds. Such indemnification shall survive the termination of this
Agreement and the Trust Fund created hereby or the resignation or removal of
the Trustee pursuant to the terms hereof.

     Section 5.06. Eligibility Requirements for the Trustee. The Trustee
hereunder shall at all times (i) be a corporation or a national banking
association organized and doing business under the laws of any state or the
United States of America or the District of Columbia, authorized under such
laws to exercise corporate trust powers, having a combined capital and surplus
of at least $50,000,000 and subject to supervision or examination by federal
or state authority and (ii) satisfy the requirements of paragraph (a)(4) of
Rule 3a-7. If such corporation or association publishes reports of condition
at least annually, pursuant to law or to the requirements of the aforesaid
supervising or examining authority, then for the purposes of this Section the
combined capital and surplus of such corporation or association shall be
deemed to be its combined capital and surplus as set forth in its most recent
report of condition so published. In case at any time the Trustee shall cease
to be eligible in accordance with the provisions of this Section, the Trustee
shall resign immediately in the manner and with the effect specified in
Section 5.07. The corporation or national banking association serving as
Trustee may have normal banking and trust relationships with the Depositor and
its affiliates; provided, however, that such corporation or association cannot
be an affiliate of the Depositor.

     Section 5.07. Resignation and Removal of the Trustee. Subject to the
requirements set forth in this Article V, the Trustee may at any time resign
and be discharged from the trusts hereby created by giving notice thereof to
the Depositor and all of the Certificateholders. Upon receiving such notice of
resignation, the Depositor (with the consent of Holders of a Majority in
Interest of each Class of Regular Certificates shall promptly appoint a
successor trustee by written instrument, in duplicate, which instrument shall
be delivered to the resigning Trustee and to the successor trustee. A copy of
such instrument shall be delivered to the Certificateholders by the Depositor.
If no successor trustee shall have been so appointed and have accepted
appointment within 30 days after the giving of such notice of resignation or
notice of removal (as provided below), the resigning or removed Trustee may
petition any court of competent jurisdiction for the appointment of a
successor trustee.

     If at any time the Trustee shall cease to be eligible in accordance with
the provisions of Section 5.06 and shall fail to resign after written request
therefor by the Depositor or any Certificateholder, or if at any time the
Trustee shall become incapable of acting, or shall be adjudged bankrupt or
insolvent, or a receiver of the Trustee or of its property shall be appointed,
or any public officer shall take charge or control of the Trustee or of its
property or affairs for the purpose of rehabilitation, reorganization,
conservation or liquidation, or if the rating of the Certificates is
downgraded by the Rating Agency due to the Trustee, then the Depositor, unless
instructed otherwise by Holders of a Majority in Interest of each Class of
Regular Certificates, shall remove the Trustee and appoint a successor trustee
by written instrument, in duplicate, which instrument shall be delivered to
the Trustee so removed and to the successor trustee. A copy of such instrument
shall be delivered to the Certificateholders by the successor trustee.

     Any resignation or removal of the Trustee and appointment of a successor
trustee pursuant to any of the provisions of this Section shall not become
effective until acceptance of appointment by the successor trustee as provided
in Section 5.08.

     Section 5.08. Successor Trustee. Any successor trustee appointed as
provided in Section 5.07 shall execute, acknowledge and deliver to each of the
Depositor, the Certificateholders and its predecessor trustee an instrument
accepting such appointment hereunder, and thereupon the resignation or removal
of the predecessor trustee shall become effective and such successor trustee,
without any further act, deed or conveyance, shall become fully vested with
all the rights, powers, duties and obligations of its predecessor hereunder,
with the like effect as if originally named as Trustee herein. The predecessor
trustee shall deliver to the successor trustee the Underlying Certificates and
all related documents and statements held by it hereunder, and the Depositor
and the predecessor trustee shall execute and deliver such instruments and do
such other things as may reasonably be required for more fully and certainly
vesting and confirming in the successor trustee all the rights, powers, duties
and obligations of the Trustee under this Agreement.

     No successor trustee shall accept appointment as provided in this Section
unless at the time of such acceptance such successor trustee shall be eligible
under the provisions of Section 5.06.

     Upon acceptance of appointment by a successor trustee as provided in this
Section, the successor trustee shall mail notice of the succession of such
trustee hereunder to all Holders of Certificates at their addresses as shown
in the Certificate Register.

     Section 5.09. Merger or Consolidation of Trustee. Any corporation (or
other Person) into which the Trustee may be merged or converted or with which
it may be consolidated or any corporation (or other Person) resulting from any
merger, conversion or consolidation to which the Trustee shall be a party, or
any corporation (or other Person) succeeding to all or substantially all of
the corporate trust business of the Trustee, shall be the successor of the
Trustee hereunder, provided such corporation (or other Person) shall be
eligible under the provisions of Section 5.06, without the execution or filing
of any paper or any further act on the part of any of the parties hereto,
anything herein to the contrary notwithstanding.

     Section 5.10. Appointment of Co-Trustee or Separate Trustee.
Notwithstanding any other provisions hereof, at any time, for the purpose of
meeting any legal requirements of any jurisdiction in which any part of any
Trust Fund or property securing the same may at the time be located, the
Depositor and the Trustee acting jointly shall have the power and shall
execute and deliver all instruments to appoint one or more Persons approved by
the Trustee to act as co-trustee or co-trustees, jointly with the Trustee, or
separate trustee or separate trustees, of all or any part of any Trust Fund,
and to vest in such Person or Persons, in such capacity, such title to the
related Trust Fund, or any part thereof, and, subject to the other provisions
of this Section 5.10, such powers, duties, obligations, rights and trusts as
the Depositor and the Trustee may consider necessary or desirable. If the
Depositor shall not have joined in such appointment within 15 days after the
receipt by it of a request so to do, the Trustee alone shall have the power to
make such appointment. No co-trustee or separate trustee hereunder shall be
required to meet the terms of eligibility as a successor trustee under Section
5.06 hereunder and no notice to Holders of Certificates of the appointment of
co-trustee(s) or separate trustee(s) shall be required under Section 5.08
hereof.

     Every separate trustee and co-trustee shall, to the extent permitted by
law, be appointed and act subject to the following provisions and conditions:

          (i) All rights, powers, duties and obligations conferred or imposed
     upon the Trustee shall be conferred or imposed upon and exercised or
     performed by the Trustee and such separate trustee or co-trustee jointly
     (it being understood that such separate trustee or co-trustee is not
     authorized to act separately without the Trustee joining in such act),
     except to the extent that under any law of any jurisdiction in which any
     particular act or acts are to be performed (as Trustee hereunder), the
     Trustee shall be incompetent or unqualified to perform such act or acts,
     in which event such rights, powers, duties and obligations (including the
     holding of title to the related Trust Fund or any portion thereof in any
     such jurisdiction) shall be exercised and performed singly by such
     separate trustee or co-trustee, but solely at the direction of the
     Trustee;

          (ii) No trustee hereunder shall be held personally liable by reason
     of any act or omission of any other trustee hereunder; and

          (iii) The Depositor and the Trustee acting jointly may at any time
     accept the resignation of or remove any separate trustee or co-trustee.

     Any notice, request or other writing given to the Trustee shall be deemed
to have been given to each of the then separate trustees and co-trustees, as
effectively as if given to each of them. Every instrument appointing any
separate trustee or co-trustee shall refer to this Agreement and the
conditions of this Article V. Each separate trustee and co-trustee, upon its
acceptance of the trusts conferred, shall be vested with the estates or
property specified in its instrument of appointment, either jointly with the
Trustee or separately, as may be provided therein, subject to all the
provisions of this Agreement, specifically including every provision of this
Agreement relating to the conduct of, affecting the liability of, or affording
protection to, the Trustee. Every such instrument shall be filed with the
Trustee and a copy thereof given to the Depositor.

     Any separate trustee or co-trustee may, at any time, constitute the
Trustee, its agent or attorney-in-fact, with full power and authority, to the
extent not prohibited by law, to do any lawful act under or in respect of this
Agreement on its behalf and in its name. If any separate trustee or co-trustee
shall die, become incapable of acting, resign or be removed, all of its
estates, properties, rights, remedies and trusts shall vest in and be
exercised by the Trustee, to the extent permitted by law, without the
appointment of a new or successor trustee.

     Section 5.11. Limited Liability. The Certificates are executed and
countersigned by the Trustee, not in its individual capacity but solely as
Trustee of the trust created by this Agreement, in the exercise of the powers
and authority conferred and vested in it by this Agreement. Each of the
undertakings and agreements made on the part of the Trustee on behalf of the
Trust Fund in the Certificates is made and intended not as a personal
undertaking or agreement by the Trustee but is made and intended for the
purpose of binding only the Trust Fund.

     Section 5.12. SEC Filings. The Trustee shall prepare and file with the
Securities and Exchange Commission on Forms 8-K and 10-K for the calendar year
1999 on behalf of the Trust Fund the reports distributed to the
Certificateholders pursuant to the first and third paragraphs of Section 3.05.
No later than January 30, 2000, the Trustee shall file a Form 15 Notice of
Suspension of Duty to File Reports pursuant to Sections 13 and 15(d) of the
Securities Exchange Act of 1934, with respect to the Certificates. A copy of
such reports shall be sent to Thomas M. Zingalli at Credit Suisse First Boston
Mortgage Securities Corp., Eleven Madison Avenue, New York, New York 10010.
The Trustee shall have no responsibility to file any items other than those
specified in this Section 5.12.

<PAGE>

                                  ARTICLE VI

                                 THE DEPOSITOR

     Section 6.01. Liability of the Depositor. The Depositor shall be liable
in accordance herewith only to the extent of the obligations specifically
imposed upon and undertaken by the Depositor herein.

     Section 6.02. Merger, Consolidation or Conversion of the Depositor.
Subject to the following paragraph, the Depositor will keep in full effect its
existence, rights and franchises as a corporation under the laws of one of the
states of the United States, and will obtain and preserve its qualification to
do business as a foreign corporation in each jurisdiction in which such
qualification is or shall be necessary to protect the validity and
enforceability of this Agreement and the Certificates and to perform its
duties under this Agreement.

     The Depositor may be merged or consolidated with or into any Person, or
transfer all or substantially all of its assets to any Person, in which case
any Person resulting from any merger or consolidation to which the Depositor
shall be a party, or any Person succeeding to the business of the Depositor,
shall be the successor of the Depositor hereunder without the execution or
filing of any paper or any further act on the part of any of the parties
hereto, anything herein to the contrary notwithstanding.

     Section 6.03. Limitation on Liability of the Depositor and Others.
Neither the Depositor nor any of the directors, officers, employees or agents
of the Depositor shall be under any liability to the Trust Fund or the
Certificateholders for any action taken or for refraining from the taking of
any action in good faith pursuant to this Agreement, or for errors in
judgment; provided, however, that this provision shall not protect the
Depositor or any such Person against any breach of warranties or
representations made by it herein, or against any liability which would
otherwise be imposed by reason of willful misfeasance, bad faith or negligence
in the performance of duties or by reason of reckless disregard of its
obligations and duties hereunder. The Depositor and any director, officer,
employee or agent of the Depositor may rely in good faith on any document of
any kind which, prima facie, is properly executed and submitted by any Person
respecting any matters arising hereunder. The Depositor and any director,
officer, employee or agent of the Depositor shall be indemnified and held
harmless by the Trust Fund against any loss, liability or expense incurred in
connection with any legal action relating to the performance of its
obligations in accordance with the provisions of this Agreement or the
Certificates, other than any loss, liability or expense incurred by reason of
any breach of warranties or representations made herein, or willful
misfeasance, bad faith or negligence. The Depositor may in its discretion
undertake any such action which Holders of a Majority in Interest of each
Class of Regular Certificates may deem necessary or desirable with respect to
this Agreement and the rights and duties of the parties hereto and the
interests of the Certificateholders hereunder. In such event, the legal
expenses and costs of such action and any liability resulting therefrom shall
be expenses, costs and liabilities of the related Trust Fund, and the
Depositor shall be entitled to be reimbursed therefor from the related
Certificate Account as provided in Section 3.03 upon delivery to the Trustee
of an Officers' Certificate stating the amount of such expenses, costs and
liabilities and that such expenses, costs and liabilities are reimbursable in
accordance with this Agreement.

<PAGE>

                                 ARTICLE VII

                                  TERMINATION

     Section 7.01. Termination. (a) Subject to Section 7.02, the respective
obligations and responsibilities of the Depositor and the Trustee created
hereby with respect to the Certificates (other than the obligation to make
certain payments and to send certain notices to Certificateholders as
hereinafter set forth) shall terminate immediately upon the occurrence of the
last action required to be taken by the Trustee on the Distribution Date
pursuant to this Article VII following the earlier of (x) the receipt of the
final distribution to be made on the last Underlying Certificate to remain
outstanding upon presentment and surrender of such Underlying Certificate in
accordance with the terms and conditions of the Underlying Agreement, (y) the
repurchase of all of the Underlying Certificates by the Depositor pursuant to
Section 2.02 or 2.03 hereof or (z) the purchase by the Holder of a Majority in
Interest of the Residual Certificate of all the Underlying Certificates;
provided, however, that no purchase of the Underlying Certificates pursuant to
clause (z) above may be effected until the outstanding principal balance of
the Underlying Certificate is less than 10% of the outstanding principal
balance thereof on the Closing Date and, provided further, that in no event
shall the trust created hereby continue beyond the expiration of twenty-one
years from the death of the last survivor of the descendants of Joseph P.
Kennedy, the late ambassador of the United States to the Court of St. James,
living on the date hereof.

     (b) Notice of the final distribution in respect of any of the Class A-1,
Class A-2, Class A-3, Class A-4, Class A-5 or Class A-6 Certificates,
specifying the Distribution Date upon which all Holders of Certificates of
such Class may surrender their Certificates to the Trustee for payment and
cancellation, shall be given by the Trustee to Certificateholders as promptly
as practicable following the Notice of Final Distribution on the related
Underlying Certificates. Such notice shall specify (i) the Distribution Date
upon which final payment on the related Certificates will be made upon
presentment and surrender of such Certificates at the office or agency
appointed by the Trustee for that purpose, (ii) the amount of any such final
payment and (iii) that the Record Date otherwise applicable to such
Distribution Date is not applicable and that payments shall be made only upon
presentation and surrender of such Certificates at the office or agency of the
Trustee therein specified. Upon presentment and surrender of the related
Certificates, the Trustee shall cause to be distributed to the related
Certificateholders an amount equal to the amount otherwise distributable on
such Distribution Date.

     (c) Any funds not distributed on the final Distribution Date for the
related Class of Regular Certificates because of the failure of any such
Certificateholders to tender their Certificates shall be set aside and held
uninvested in trust for the account of the appropriate non-tendering
Certificateholders, whereupon the Trust Fund shall terminate. If any
Certificates as to which notice of the final Distribution Date has been given
pursuant to this Section 7.01 shall not have been surrendered for cancellation
within six months after the time specified in such notice, the Trustee shall
mail a second notice to the remaining Certificateholders, at their last
addresses shown in the Certificate Register, to surrender their Certificates
for cancellation in order to receive, from such funds held, the final
distribution with respect thereto. If within one year after the second notice
any Certificate shall not have been surrendered for cancellation, the Trustee
shall, directly or through an agent, take reasonable steps to contact the
remaining Certificateholders concerning surrender of their Certificates. The
costs and expenses of maintaining such funds and of contacting
Certificateholders shall be paid out of the assets which remain held. If
within two years any Certificates shall not have been surrendered for
cancellation, the Trustee shall pay to the Depositor all amounts distributable
to the Holders thereof and the Depositor shall thereafter hold such amounts
for the benefit of such Holders. No interest shall accrue or be payable to any
Certificateholder on any amount held as a result of such Certificateholder's
failure to surrender its Certificate(s) for final payment thereof in
accordance with this Section 7.01.

     Section 7.02. Additional Termination Requirements. (a) The REMIC shall be
terminated in accordance with the following additional requirements, unless
the Trustee has been supplied with an Opinion of Counsel, which Opinion of
Counsel shall not be an expense of the Trustee, to the effect that the failure
of the REMIC to comply with the requirements of this Section 7.02 will not (i)
result in the imposition of taxes on "prohibited transactions" of the REMIC as
defined in section 860F of the Code, or (ii) cause the REMIC to fail to
qualify as a REMIC at any time that any Certificates relating thereto are
outstanding:

          (i) Within 90 days prior to the final Distribution Date for the
     REMIC set forth in the notice to Certificateholders given under Section
     7.01, the Holders of the Residual Certificates shall adopt a plan of
     complete liquidation of the REMIC within the meaning of section
     860F(a)(4) of the Code and shall prepare and shall deliver to the Trustee
     all documentation associated with such plan of complete liquidation; and

          (ii) Within 90 days after the time of adoption of such a plan of
     complete liquidation and at or prior to the final Distribution Date, the
     Trustee shall, upon receipt of all documentation associated with such
     plan of complete liquidation, sell or otherwise dispose of all of the
     assets of the REMIC, in a time and manner specified by such plan of
     complete liquidation.

     (b) By its acceptance of the Residual Certificates, the Holders thereof
hereby agree to adopt such a plan of complete liquidation with respect to the
REMIC upon the written request of, and to take such other action in connection
therewith as may be reasonably requested by, the Trustee or the Depositor.

     (c) The Trustee as agent for the REMIC hereby agrees to adopt and sign
such a plan of complete liquidation upon the written request of the Depositor
and the receipt of the Opinion of Counsel referred to in Section 7.02(a)
hereof, if applicable and to take such other action in connection therewith as
may be reasonably requested by the Depositor.

<PAGE>

                                 ARTICLE VIII

                           MISCELLANEOUS PROVISIONS

     Section 8.01. Amendment. This Agreement may be amended by the Depositor
and the Trustee, without the consent of any of the Certificateholders, (i) to
cure any error or ambiguity, (ii) to correct or supplement any provision
herein which may be defective or inconsistent with any other provision herein,
(iii) to permit any other provisions with respect to matters or questions
arising under this Agreement which are not inconsistent with the provisions of
this Agreement, (iv) to comply with the Securities Act of 1933, as amended or
the Investment Company Act of 1940, as amended, (v) to amend any of the
exhibits to this Agreement pursuant to the terms of this Agreement or (vi) if
such amendment is reasonably necessary, as evidenced by an Opinion of Counsel,
to comply with any requirements imposed by the Code or any successor or
amendatory statute or any temporary or final regulation, revenue ruling,
revenue procedure or other written official announcement or interpretation
relating to federal income tax laws or any proposed such action which, if made
effective, would apply retroactively to the Trust Fund at least from the
effective date of such amendment; provided that such action (except any
amendment described in (vi) above) shall not, as evidenced by an Opinion of
Counsel, which Opinion of Counsel shall not be an expense of the Trustee,
delivered to the Trustee, adversely affect in any material respect the
interests of any Certificateholder; provided, further, that any such amendment
shall be deemed not to adversely affect in any material respect the interests
of any Certificateholder if the person requesting the amendment obtains
letters from the Rating Agencies that the amendment would not result in the
downgrading or withdrawal of the ratings then assigned to the Offered
Certificates.

     This Agreement may also be amended by the Depositor and the Trustee with
the consent of the holders of a Majority in Interest of each Class of
Certificates affected thereby for the purpose of adding any provisions to or
changing in any manner or eliminating any of the provisions of this Agreement
or of modifying in any manner the rights of the holders of Certificates;
provided, however, that no such amendment may (a) reduce in any manner the
amount of, or delay the timing of, distributions required to be made on any
Certificate without the consent of the holder of such Certificate, (b)
adversely affect in any material respect the interest of the holders of the
Certificates of any Class in a manner other than as described in clause (a)
above without the consent of the holders of Certificates of such Class
representing not less than 66% of the Percentage Interests represented by such
Class or (c) reduce the aforesaid percentages of Certificates the holders of
which are required to consent to any such amendment without the consent of the
holders of all Certificates then outstanding.

     Notwithstanding any contrary provision of this Agreement, the Trustee
shall not consent to any amendment to this Agreement unless it shall have
first received at the expense of the Person requesting such amendment (or, in
the event such amendment is requested by the Trustee, at the expense of the
Depositor), an Opinion of Counsel to the effect that such amendment will not
cause the Trust Fund to fail to qualify as a REMIC at any time that any
related Certificates are Outstanding.

     Promptly after the execution of any such amendment the Trustee shall
furnish a copy of or a statement describing the amendment to each
Certificateholder.

     The manner of obtaining such consents and of evidencing the authorization
of the execution thereof by Certificateholders shall be subject to such
reasonable regulations as the Trustee may prescribe.

     Prior to executing any amendment, the Trustee shall be entitled to
receive and rely upon an Opinion of Counsel, stating that the execution of
such amendment is authorized or permitted by this Agreement.

     Section 8.02. Action Under and Conflicts With the Underlying Agreements.
Subject to the terms hereof, in the event that there shall be any matters
arising under any of the Underlying Agreements which require the vote or
direction of the holders of the Underlying Certificate, the Trustee, as holder
of the Underlying Certificate, shall vote such Underlying Certificate in
accordance with instructions received from Holders of a Majority in Interest
of the related Class of Regular Certificates. In the absence of any such
instructions, the Trustee shall not vote such Underlying Certificate;
provided, however, that, notwithstanding the absence of such instructions, in
the event a required distribution pursuant to an Underlying Agreement shall
not have been made, the Trustee shall, subject to the provisions of Article V
hereof, pursue such remedies as may be available to it as holder of such
Underlying Certificate in accordance with the terms of the Underlying
Agreement.

     Section 8.03. Recordation of Agreement. This Agreement (or an abstract
hereof, if acceptable by the applicable recording office) is subject to
recordation in all appropriate public offices, such recordation to be effected
by the Depositor at its expense if such recordation beneficially affects the
interests of the Certificateholders.

     For the purpose of facilitating the recordation of this Agreement as
herein provided and for other purposes, this Agreement may be executed
simultaneously in any number of counterparts, each of which counterparts shall
be deemed to be an original, and such counterparts shall constitute but one
and the same instrument.

     Section 8.04. Limitation on Rights of Certificateholders. The death or
incapacity of any Certificateholder shall not operate to terminate this
Agreement, or the Trust Fund, nor entitle such Certificateholder's legal
representatives or heirs to claim an accounting or to take any action or
proceeding in any court for a partition or winding up of the Trust Fund, nor
otherwise affect the rights, obligations and liabilities of the parties hereto
or any of them.

     No Certificateholder shall have any right to vote (except as expressly
provided for herein) or in any manner otherwise control the operation and
management of the Trust Fund, or the obligations of the parties hereto, nor
shall anything herein set forth, or contained in the terms of the
Certificates, be construed so as to constitute the Certificateholders from
time to time as partners or members of an association; nor shall any
Certificateholder be under any liability to any third party by reason of any
action taken by the parties to this Agreement pursuant to any provision
hereof.

     No Certificateholder shall have any right by virtue of any provision of
this Agreement to institute any suit, action or proceeding in equity or at law
upon or under or with respect to this Agreement, unless such Holder previously
shall have given to the Trustee a notice of a default by the Depositor or the
Trustee in the performance of any obligation hereunder, and of the continuance
thereof, as hereinbefore provided, and unless also the Holders of Certificates
evidencing Percentage Interests in each Class of Regular Certificates
aggregating at least 25% shall have made written request upon the Trustee to
institute such action, suit or proceeding in its own name as Trustee hereunder
and shall have offered to the Trustee such reasonable indemnity as it may
require against the costs, expenses and liabilities to be incurred therein or
thereby, and the Trustee, for 60 days after its receipt of such notice,
request and offer of indemnity, shall have neglected or refused to institute
any such action, suit or proceeding. It is understood and intended, and
expressly covenanted by each Certificateholder with every other
Certificateholder and the Trustee, that no one or more Holders of Certificates
shall have any right in any manner whatever by virtue of any provision of this
Agreement to affect, disturb or prejudice the rights of the Holders of any
other Certificates, or to obtain or seek to obtain priority over or preference
to any other such Holder, or to enforce any right under this Agreement, except
in the manner herein provided. For the protection and enforcement of the
provisions of this Section, each and every Certificateholder and the Trustee
shall be entitled to such relief as can be given either at law or in equity.

     Section 8.05. Governing Law. THIS AGREEMENT AND THE CERTIFICATES SHALL BE
CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK AND THE
OBLIGATIONS, RIGHTS AND REMEDIES OF THE PARTIES HEREUNDER SHALL BE DETERMINED
IN ACCORDANCE WITH SUCH LAWS.

     Section 8.06. Notices. All demands, notices and direction to either party
hereunder shall be in writing and shall be deemed effective when delivered to:
(i) in the case of the Depositor, Credit Suisse First Boston Mortgage
Securities Corp., 11 Madison Avenue, New York, New York 10010, Attention:
Structured Finance, (ii) in the case of the Trustee, The Bank of New York, 101
Barclay Street, 12E, New York, New York 10286, Attention: Corporate Trust -
MBS Administration, or such other address as may hereafter be furnished by any
party to the others. Any notice required or permitted to be mailed to a
Certificateholder shall be given by first class mail, postage prepaid, at the
address of such Holder as shown in the Certificate Register; any notice so
mailed within the time prescribed in this Agreement shall be conclusively
presumed to have been duly given, whether or not the Certificateholder
receives such notice.

     Section 8.07. Severability of Provisions. If any one or more of the
covenants, agreements, provisions or terms of this Agreement shall be for any
reason whatsoever held invalid, then such covenants, agreements, provisions or
terms shall be deemed severable from the remaining covenants, agreements,
provisions or terms of this Agreement and shall in no way affect the validity
or enforceability of the other provisions of this Agreement or of the
Certificates or the rights of the Holders thereof.

     Section 8.08. Successors and Assigns. The provisions of this Agreement
shall be binding upon and inure to the benefit of the respective successors
and assigns of the parties hereto, and all such provisions shall inure to the
benefit of the Certificateholders.

     Section 8.09. Article and Section Headings. The article and section
headings herein are for convenience of reference only, and shall not limit or
otherwise affect the meaning hereof.

     Section 8.10. Certificates Nonassessable and Fully Paid. It is the
intention of this Agreement that Certificateholders shall not be personally
liable for obligations of the related Trust Fund, that the beneficial
ownership interests represented by the Certificates shall be nonassessable for
any losses or expenses of the Trust Fund or for any reason whatsoever, and
that Certificates upon execution, countersignature and delivery thereof by the
Trustee pursuant to Section 2.04 are and shall be deemed fully paid.




                                     * * *

<PAGE>

      IN WITNESS WHEREOF, the Depositor and the Trustee have caused their
names to be signed hereto by their respective officers thereunto duly
authorized, all as of the day and year first above written.

                                   CREDIT SUISSE FIRST BOSTON MORTGAGE
                                       SECURITIES CORP.,
                                       as Depositor


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


                                   THE BANK OF NEW YORK,
                                        not in its individual
                                        capacity, but solely as
                                        Trustee


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

<PAGE>

<TABLE>
<CAPTION>

                                                    SCHEDULE I


                                  LIST OF UNDERLYING CERTIFICATES AND AGREEMENTS


                                                                 Original
                                      Principal Balance as      Principal
Underlying Certificates                 of Closing Date          Balance         Rate     Maturity Date     Underlying Agreement
- -----------------------               --------------------   ------------       ------    -------------   -----------------------

<S>                                       <C>                <C>                 <C>      <C>             <C>
Headlands Mortgage Securities             $362,172,595.56    $381,205,100        6.75%    11/25/2028      Pooling and Servicing
Inc., Series 1998-2, Class A-1                                                                            Agreement, dated as of
                                                                                                          October 1, 1998 among
                                                                                                          Headlands Mortgage
                                                                                                          Securities, Inc.,
                                                                                                          Headlands Mortgage
                                                                                                          Company, and The Bank of
                                                                                                          New York

</TABLE>

<PAGE>

                                   EXHIBIT A

         [FORM OF CLASS [A-1] [A-2] [A-3][A-4][A-5][A-6] CERTIFICATE]

SOLELY FOR U.S. FEDERAL INCOME TAX PURPOSES, THIS CERTIFICATE IS A "REGULAR
INTEREST" IN A "REAL ESTATE MORTGAGE INVESTMENT CONDUIT," AS THOSE TERMS ARE
DEFINED, RESPECTIVELY, IN SECTIONS 860G AND 860D OF THE INTERNAL REVENUE CODE
OF 1986, AS AMENDED (THE "CODE").

BY ACCEPTING THIS CERTIFICATE, A TRANSFEREE SHALL BE DEEMED TO HAVE REPRESENTED
TO THE TRUSTEE (I) THAT SUCH TRANSFEREE IS NOT AN EMPLOYEE BENEFIT PLAN SUBJECT
TO THE EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED, NOR A PLAN
SUBJECT TO SECTION 4975 OF THE CODE, NOR IS SUCH TRANSFEREE ACQUIRING THIS
CERTIFICATE ON BEHALF OF OR WITH THE ASSETS OF SUCH A PLAN OR (II) THAT THE
PURCHASE THEREOF IS COVERED BY PTE 84-14, PTE 90-1, PTE 91-38, PTE 95-60, OR
PTE 96-23 OR A SIMILAR EXEMPTION AND THAT IT SATISFIES THE CONDITIONS FOR
APPLICATION OF THE UNDERWRITER'S EXEMPTION GRANTED TO THE UNDERWRITER OF THE
UNDERLYING CERTIFICATES WITH RESPECT TO THE UNDERLYING CERTIFICATES.

<TABLE>

<S>                                                  <C>                        <C>

Certificate No.:                                     ____

First Distribution Date:                                                        _________________

Closing Date Principal
Balance evidenced
by this Certificate
("Denomination"):                                    $____________

Closing Date Principal
Balances evidenced
by all Class [A-1] [A-2] [A-3] [A-4] [A-5] [A-6]
Certificates:                                        $_________________

</TABLE>


                          CREDIT SUISSE FIRST BOSTON
                           MORTGAGE SECURITIES CORP.
                  MORTGAGE PASS-THROUGH CERTIFICATES, SERIES
               1999-1 Class [A-1] [A-2] [A-3] [A-4] [A-5] [A-6]

         evidencing a percentage interest in the distributions allocable to the
         Class [A-1] [A-2] [A-3] [A-4] [A-5] [A-6] Certificates with respect to
         the Trust Fund consisting of the related Underlying Certificates

             Credit Suisse First Boston Mortgage Securities Corp.


     This Certificate does not evidence an obligation of, or an interest in,
and is not guaranteed by Credit Suisse First Boston Mortgage Securities Corp.
or the Trustee referred to below or any of their respective affiliates.
Neither this Certificate nor the Underlying Certificates are guaranteed or
insured by any governmental agency or instrumentality.

     This certifies that _______________________________ is the registered
owner of the Percentage Interest evidenced by this Certificate (obtained by
dividing the denomination of this Certificate by the aggregate of the
denominations of all Class [A-1] [A-2] [A-3] [A-4] [A-5] [A-6] Certificate) in
certain monthly distributions with respect to the Trust Fund consisting of the
Underlying Certificates and deposited by Credit Suisse First Boston Mortgage
Securities Corp. (the "Depositor"). The Trust Fund was created pursuant to a
Trust Agreement dated as of October 29, 1999 (the "Trust Agreement") between
the Depositor and The Bank of New York, as trustee (the "Trustee"). To the
extent not defined herein, the capitalized terms used herein have the meanings
assigned in the Trust Agreement. This Certificate is issued under and is
subject to the terms, provisions and conditions of the Trust Agreement, to
which Trust Agreement the Holder of this Certificate by virtue of the
acceptance hereof assents and by which such Holder is bound.

     Pursuant to the terms of the Trust Agreement, a distribution of interest
received on the Underlying Certificates will be made on the second Business
Day following the 25th day of each calendar month (a "Distribution Date"),
commencing on the first Distribution Date specified above, to the Person in
whose name this Certificate is registered at the close of business on the
applicable Record Date in an amount equal to the product of the Percentage
Interest evidenced by this Certificate and the amount required to be
distributed to Holders of Class [A-1] [A-2] [A-3] [A-4] [A-5] [A-6]
Certificates on such Distribution Date pursuant to Section 3.04 of the Trust
Agreement. The Record Date applicable to the first Distribution Date is the
Closing Date and as to each succeeding Distribution Date is the last Business
Day of the month next preceding the month of such Distribution Date.

     Distributions to any Certificateholder on any Distribution Date shall be
made by wire transfer of immediately available funds to the account of such
Certificateholder at a bank or other entity having appropriate facilities
therefor. Except as otherwise provided in the Trust Agreement, the final
distribution on this Certificate will be made in the applicable manner
described above, but only upon presentment and surrender of this Certificate
at the Corporate Trust Office or such other location specified in the notice
to Certificateholders of such final distribution.

     Each transferee of a Class A Certificate shall be deemed to represent by
its acceptance of such Certificate that (i) it is not a Plan or a person
investing on behalf of or with assets of a Plan, or (ii) its acquisition of
the Class A Certificate is covered by Prohibited Transaction Class Exemption
("PTE") 84-14, which exempts certain transactions effected on behalf of a Plan
by an "in-house asset manager," PTE 90-1, which exempts certain transactions
between insurance company pooled separate accounts and parties in interest,
PTE 91-38, which exempts certain transactions between bank collective
investment funds and parties in interest, PTE 95-60, which exempts certain
transactions between insurance company general accounts and parties in
interest, PTE 96-23, which exempts certain transactions effected on behalf of
a Plan by a "qualified professional asset manager," or a similar exemption,
and also satisfies the conditions for application of the underwriter's
exemption granted to the underwriter of the Underlying Certificates with
respect to the Underlying Certificates.

     Reference is hereby made to the further provisions of this Certificate
set forth on the reverse hereof, which further provisions shall for all
purposes have the same effect as if set forth at this place.

                                   * * * * *

<PAGE>

     This Certificate shall not be entitled to any benefit under the Trust
Agreement or be valid for any purpose unless manually countersigned by an
authorized officer of the Trustee.

     IN WITNESS WHEREOF, the Trustee has caused this Certificate to be duly
executed.

Dated:  October    , 1999

                                                  THE BANK OF NEW YORK,
                                                  not in its individual
                                                  capacity but solely as
                                                  Trustee


                                                  By __________________________

Countersigned:



By  ___________________________
     Authorized Officer of
     THE BANK OF NEW YORK,
     not in its individual
     capacity but solely
     as Trustee

<PAGE>

                                   EXHIBIT B

                                  [RESERVED]

<PAGE>

                                   EXHIBIT C

                         [FORM OF CLASS R CERTIFICATE]

SOLELY FOR U.S. FEDERAL INCOME TAX PURPOSES, THIS CERTIFICATE IS A "RESIDUAL
INTEREST" IN A "REAL ESTATE MORTGAGE INVESTMENT CONDUIT," AS THOSE TERMS ARE
DEFINED, RESPECTIVELY, IN SECTIONS 860G AND 860D OF THE INTERNAL REVENUE CODE
OF 1986, AS AMENDED (THE "CODE").

THIS CERTIFICATE HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 (THE
"SECURITIES ACT"), ANY STATE SECURITIES LAWS OR THE INVESTMENT COMPANY ACT OF
1940 (THE "INVESTMENT COMPANY ACT"). ANY SALE, TRANSFER OR ASSIGNMENT OF THIS
CERTIFICATE OR ANY INTEREST HEREIN MAY BE MADE ONLY: (I) (A) SO LONG AS THIS
CERTIFICATE IS ELIGIBLE FOR RESALE PURSUANT TO RULE 144A UNDER THE SECURITIES
ACT ("RULE 144A"), TO A PERSON WHOM THE DEPOSITOR REASONABLY BELIEVES IS A
QUALIFIED INSTITUTIONAL BUYER WITHIN THE MEANING OF RULE 144A, PURCHASING FOR
ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM
NOTICE HAS BEEN GIVEN THAT THE RESALE, PLEDGE OR OTHER TRANSFER IS BEING MADE
IN RELIANCE ON RULE 144A OR (B) PURSUANT TO AN EXEMPTION FROM REGISTRATION IN
ACCORDANCE WITH RULE 144 (IF AVAILABLE) UNDER THE SECURITIES ACT; AND (II) IN
ACCORDANCE WITH THE OTHER RESTRICTIONS SET FORTH IN SECTION 4.02(b), (c) AND
(d) OF THE TRUST AGREEMENT REFERRED TO BELOW.

NEITHER THIS CERTIFICATE NOR ANY INTEREST HEREIN MAY BE TRANSFERRED UNLESS THE
TRANSFEREE DELIVERS TO THE TRUSTEE EITHER A REPRESENTATION SATISFACTORY TO THE
TRUSTEE THAT SUCH TRANSFEREE IS NOT AN EMPLOYEE BENEFIT PLAN SUBJECT TO THE
EMPLOYEE RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED, NOR A PLAN SUBJECT
TO SECTION 4975 OF THE CODE, OR AN OPINION OF COUNSEL IN ACCORDANCE WITH THE
PROVISIONS OF SECTION 4.02(c) OF THE TRUST AGREEMENT REFERRED TO HEREIN.
NOTWITHSTANDING ANYTHING ELSE TO THE CONTRARY HEREIN, ANY PURPORTED TRANSFER OF
THIS CERTIFICATE TO OR ON BEHALF OF AN EMPLOYEE BENEFIT PLAN SUBJECT TO ERISA
OR TO THE CODE WITHOUT THE OPINION OF COUNSEL SATISFACTORY TO THE TRUSTEE AS
DESCRIBED ABOVE SHALL BE VOID AND OF NO EFFECT.

THIS CERTIFICATE REPRESENTS THE "TAX MATTERS PERSON CLASS R CERTIFICATE" ISSUED
UNDER THE TRUST AGREEMENT REFERRED TO BELOW AND MAY NOT BE TRANSFERRED TO ANY
PERSON.

<PAGE>

<TABLE>

<S>                                                  <C>                         <C>

Certificate No.:  ______

First Principal Distribution Date:                                              _________________

Closing Date Principal
Balance evidenced
by this Certificate
("Denomination"):                                    $____________

Closing Date Principal
Balances evidenced
by all Class R
Certificates:                                        $_________________

</TABLE>

             CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
              MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 1999-1,
                                    CLASS R

         evidencing a percentage interest in the distributions allocable to the
         Class R Certificates with respect to the Trust Fund consisting of the
         Underlying Certificates

      Credit Suisse First Boston Mortgage Securities Corp., as Depositor


     This Certificate does not evidence an obligation of, or an interest in,
and is not guaranteed by Credit Suisse First Boston Mortgage Securities Corp.
or the Trustee referred to below or any of their respective affiliates.
Neither this Certificate nor the Underlying Certificates are guaranteed or
insured by any governmental agency or instrumentality.

     This certifies that _______________________________ is the registered
owner of the Percentage Interest evidenced by this Certificate in certain
monthly distributions with respect to the portion of the Trust Fund consisting
of the Underlying Certificates and deposited by Credit Suisse First Boston
Mortgage Securities Corp. (the "Depositor"). The Trust Fund was created
pursuant to a Trust Agreement dated as of October 29, 1999 (the "Trust
Agreement") between the Depositor and The Bank of New York, as trustee (the
"Trustee"). To the extent not defined herein, the capitalized terms used
herein have the meanings assigned in the Trust Agreement. This Certificate is
issued under and is subject to the terms, provisions and conditions of the
Trust Agreement, to which Trust Agreement the Holder of this Certificate by
virtue of the acceptance hereof assents and by which such Holder is bound.

     Pursuant to the terms of the Trust Agreement, a distribution received on
the Underlying Certificates will be made on the third business day following
the 24th day of each calendar month (a "Distribution Date"), commencing on the
first Distribution Date specified above, to the Person in whose name this
Certificate is registered at the close of business on the applicable Record
Date in an amount equal to the product of the Percentage Interest evidenced by
this Certificate and the amount required to be distributed to Holders of Class
R Certificates on such Distribution Date pursuant to Section 3.04 of the Trust
Agreement. The Record Date applicable to the first Distribution Date is the
Closing Date and as to each succeeding Distribution Date is the last Business
Day of the month next preceding the month of such Distribution Date.

     Except as otherwise provided in the Trust Agreement, the distribution of
the proceeds of any remaining assets of the Trust Fund on this Certificate
shall be made by wire transfer of immediately available funds to the account
of such Certificateholder at a bank or other entity having appropriate
facilities therefor, if such Certificateholder shall have so notified the
Trustee in writing at least five Business Days prior to the related Record
Date and such Certificateholder shall hold Certificates evidencing a
Percentage Interest of 10% or greater, or in such other manner as shall be
agreed to by the Trustee and such Certificateholder, or otherwise by check
mailed by first class mail to the address of such Certificateholder appearing
in the Certificate Register, but only upon presentment and surrender of this
Certificate at the Corporate Trust Office or such other location specified in
the notice to Certificateholders of such final distribution.

     No Transfer of a Class R Certificate shall be made unless such Transfer
is exempt from the registration requirements of the Securities, and any state
securities laws or is made in accordance with said Act and laws. A Class R
Certificate may not be transferred or resold except as permitted under the
Securities Act pursuant to registration or an exemption therefrom. Each Holder
and prospective purchaser of a Class R Certificate shall respectively deliver
a completed and duly executed certificate as described in Section 4.02(b) of
the Trust Agreement to the Trustee and to the Depositor for inspection prior
to effecting any requested Transfer. The Depositor and the Trustee may rely
conclusively upon the information contained in any such certificates in the
absence of knowledge to the contrary. In connection with any Transfer within
three years from the date of the initial issuance of the Certificates, the
Depositor or the Trustee may (except in the case of (x) a Transfer to a
qualified institutional buyer within the meaning of Rule 144A or (y) the
initial Transfer by Credit Suisse First Boston Mortgage Securities Corp. or
any affiliate thereof) require an unqualified Opinion of Counsel to the effect
that such Transfer may be effected without registration under the Securities
Act and without loss of any applicable Investment Company Act exemption, which
Opinion of Counsel shall be addressed to the Depositor and the Trustee and
shall be secured at the expense of the Holder.

     No Transfer of a Class R Certificate shall be made unless the Trustee
shall have received (i) a representation letter from the transferee of a Class
R Certificate in form and substance satisfactory to the Trustee that such
transferee is not an employee benefit plan subject to Section 406 of ERISA or
a plan subject to Section 4975 of the Code, nor a Person acting on behalf of
any such plan or using the assets of any such plan to effect such Transfer or
(ii) in the case of any such Class R Certificate presented for registration in
the name of an employee benefit plan subject to ERISA or a plan subject to
Section 4975 of the Code (or comparable provisions of any subsequent
enactments), or a trustee of any such plan or any Person acting on behalf of
any such plan or using the assets of any such plan to effect such Transfer, an
Opinion of Counsel to the effect that the purchase or holding of such Class R
Certificate will not constitute a prohibited transaction and will not result
in the assets of the Underlying Trust being deemed to be "plan assets" and
subject to the prohibited transaction provisions of ERISA and the Code and
will not subject the Underlying Trustee to any obligation in addition to those
expressly undertaken in the Underlying Trust Agreement. Notwithstanding
anything else to the contrary herein, any purported Transfer of a Certificate
to or on behalf of an employee benefit plan subject to ERISA or a plan subject
to Section 4975 of the Code without the delivery to the Trustee of an Opinion
of Counsel, which shall not be an expense of the Depositor or the Trustee,
satisfactory to the Trustee and the Depositor as described above shall be null
and void and of no effect.

     No Transfer of a Class R Certificate shall be made unless the Trustee
shall have received a representation letter from the transferee of such
Certificate acceptable to and in form and substance satisfactory to the
Trustee, to the effect that (a) such transferee is one "person" for purposes
of Section 3(c)(1) of the Investment Company Act, or is holding as nominee for
the number of beneficial owners set forth in such representation letter (each
of which is a purchaser), (b) such transferee is acquiring such Certificate
(either directly or through the nominee holder) as principal for its own
account for investment and not for sale in connection with any distribution
thereof, (c) such transferee was not formed solely for the purpose of
investing in the Trust Fund and is not a partnership, common trust fund, or
special trust, pension fund or retirement plan in which the partners,
beneficiaries or participants, as the case may be, may designate the
particular investments to be made or the allocation thereof, (d) such
transferee agrees that it shall not hold such Certificate for the benefit of
any other person and shall be the sole beneficial owner thereof for all
purposes, (e) such transferee shall not sell participation interests in such
Certificate or enter into any other arrangement pursuant to which any other
person shall be entitled to a beneficial interest in the distributions on the
Certificates and (f) the purchase of such Certificate (together with all other
securities owned directly or indirectly by the transferee of all other issuers
which are or would, but for the exception set forth in sub-paragraph (A) of
Section 3(c)(1) of the Investment Company Act, be excluded from the definition
of "investment company" solely by Section 3(c)(1) of the Investment Company
Act) constitutes an investment of no more than 10% of the transferee's assets.
Notwithstanding anything else to the contrary herein, any purported Transfer
of a Certificate without the delivery to the Trustee of a representation
letter from the transferee of such Certificate satisfactory to the Trustee as
described above shall be null and void and of no effect.

     Each Holder of this Class R Certificate shall be deemed to have agreed to
be bound by the restrictions that (i) each person holding or acquiring any
Ownership Interest in this Class R Certificate must be a Permitted Transferee,
(ii) no Ownership Interest in this Class R Certificate may be transferred
without delivery to the Trustee of (a) a Transfer affidavit of the proposed
transferee and (b) a Transfer certificate of the transferor, each of such
documents to be in the form described in the Trust Agreement, (iii) each
person holding or acquiring any Ownership Interest in this Class R Certificate
must agree to require a transfer affidavit and to deliver a transferor
certificate to the Trustee as required pursuant to the Trust Agreement, (iv)
any attempted or purported Transfer of any Ownership Interest in this Class R
Certificate in violation of such restrictions will be absolutely null and void
and shall vest no rights in the purported transferee, and (v) if any person
other than a Permitted Transferee acquires any Ownership Interest in this
Class R Certificate in violation of such restrictions, then the Trustee will
have the right, in its sole discretion and without notice to the Holder of
this Class R Certificate, to sell this Class R Certificate to a purchaser
selected by the Trustee, which purchaser may be the Trustee, or any affiliate
of the Trustee, on such terms and conditions as the Trustee may choose.

     Reference is hereby made to the further provisions of this Certificate
set forth on the reverse hereof, which further provisions shall for all
purposes have the same effect as if set forth at this place.

                                   * * * * *

<PAGE>

     This Class R Certificate shall not be entitled to any benefit under the
Trust Agreement or be valid for any purpose unless manually countersigned by
an authorized officer of the Trustee.

     IN WITNESS WHEREOF, the Trustee has caused this Certificate to be duly
executed.

Dated:  October     , 1999

                                           THE BANK OF NEW YORK,
                                           not in its individual
                                           capacity but solely as
                                           Trustee


                                           By ___________________________
Countersigned:



By   ___________________________
       Authorized Officer of
       THE BANK OF NEW YORK,
       not in its individual
       capacity but solely
       as Trustee

<PAGE>

                                   EXHIBIT D

                       [Form of Reverse of Certificate]

             CREDIT SUISSE FIRST BOSTON MORTGAGE SECURITIES CORP.
               MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 1999-1

     This Certificate is one of a duly authorized issue of Certificates
designated as Credit Suisse First Boston Mortgage Securities Corp. Mortgage
Pass-Through Certificates, Series 1999-1 issued in five Classes (Class A-1,
Class A-2, Class A-3, Class A-4, Class A-5, Class A-6 and Class R, herein
collectively called the "Certificates"), and representing a beneficial
ownership interest in (i) the Underlying Certificates, (ii) the distributions
thereon on and after the Closing Date, and (iii) the Certificate Account and
such assets that are deposited therein from time to time and any investments
thereof, together with any and all income, proceeds and payments with respect
thereto.

     The Certificates are limited in right of payment to certain distributions
in respect of the Underlying Certificates, all as more specifically set forth
in the Trust Agreement. The Certificateholder, by its acceptance of this
Certificate, agrees that it will look solely to the funds on deposit in the
Certificate Account for payment hereunder and that the Trustee is not liable
to the Certificateholders for any amount payable under this Certificate or the
Trust Agreement or, except as expressly provided in the Trust Agreement,
subject to any liability under the Trust Agreement.

     This Certificate does not purport to summarize the Trust Agreement and
reference is made to the Trust Agreement for the interests, rights and
limitations of rights, benefits, obligations and duties evidenced thereby, and
the rights, duties and immunities of the Trustee.

     The Trust Agreement permits, with certain exceptions therein provided,
the amendment thereof and the modification of the rights and obligations of
the Trustee and the rights of the Certificateholders under the Trust Agreement
at any time by the Depositor and the Trustee with the consent of the Holders
of a Majority in Interest of each Class of Certificates affected thereby. Any
such consent by the Holder of this Certificate shall be conclusive and binding
on such Holder and upon all future Holders of this Certificate and of any
Certificate issued upon the Transfer hereof or in exchange herefor or in lieu
hereof whether or not notation of such consent is made upon this Certificate.
The Trust Agreement also permits the amendment thereof, in certain limited
circumstances, without the consent of the Holders of any of the Certificates.

     As provided in the Trust Agreement and subject to certain limitations
therein set forth, the Transfer of this Certificate is registrable in the
Certificate Register of the Trustee upon surrender of this Certificate for
registration of transfer at the office or agency maintained by the Trustee in
New York, New York, accompanied by a written instrument of transfer in form
satisfactory to the Trustee executed by the holder hereof or such holder's
attorney duly authorized in writing, and thereupon one or more new
Certificates of the same Class in authorized denominations and evidencing the
same aggregate Percentage Interest in the Trust Fund will be issued to the
designated transferee or transferees.

     The Certificates are issuable only as registered Certificates without
coupons in denominations specified in the Trust Agreement. As provided in the
Trust Agreement and subject to certain limitations therein set forth,
Certificates are exchangeable for new Certificates of the same Class in
authorized denominations and evidencing the same aggregate Percentage
Interest, as requested by the Holder surrendering the same.

     No service charge will be made for any such registration of transfer or
exchange, but the Trustee may require payment of a sum sufficient to cover any
tax or other governmental charge payable in connection therewith.

     The Depositor and the Trustee and any agent of the Depositor or the
Trustee may treat the Person in whose name this Certificate is registered as
the owner hereof for all purposes, and neither the Depositor, the Trustee nor
any such agent shall be affected by any notice to the contrary.

     The obligations and responsibilities created by the Trust Agreement and
the Trust Fund created thereby shall terminate upon the occurrence of the last
action required to be taken by the Trustee pursuant to the Trust Agreement
following the receipt of the final distribution to be made on the last
outstanding Underlying Certificate upon presentation and surrender of such
Underlying Certificate in accordance with the terms and conditions of the
related Underlying Agreement.

<PAGE>




                                                    ASSIGNMENT


     FOR VALUE RECEIVED, the undersigned hereby sell(s), assign(s) and
transfer(s) unto
                 -------------------------------------------------------------
- ------------------------------------------------------------------------------
- ------------------------------------------------------------------------------
(Please print or typewrite name and address including postal zip code of
assignee)

the Percentage Interest evidenced by the within Pass-Through Certificate and
hereby authorizes the transfer of registration of such Interest to assignee on
the Certificate Register of the Trust Fund.

     I (We) further direct the Trustee to issue a new Certificate of a like
denomination and Class, to the above named assignee and deliver such
Certificate to the following address:

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

Dated:

                                   ------------------------------------------
                                   Signature by or on behalf of assignor






                           DISTRIBUTION INSTRUCTIONS

     The assignee should include the following for purposes of distribution:

     Distributions shall be made, by wire transfer or otherwise, in
immediately available funds to
                               ------------------------------------------------
- ------------------------------------------------------------------------------,
for the account of ___________________________________________________________,
account number _______________, or, if mailed by check, to ____________________
_________________________________. Applicable statements should be mailed to
______________________________________________________________________________
______________________________________________________________________________

     This information is provided by _________________________________________,
the assignee named above, or _________________________________________________,
as its agent.

<PAGE>

STATE OF                       )
                               )   ss.:
COUNTY OF                      )


     On the __th day of _________, 19__ before me, a notary public in and for
said State, personally appeared ______________ __________, known to me who,
being by me duly sworn, did depose and say that he executed the foregoing
instrument.



                                          -------------------------------------
                                                         Notary Public


[Notarial Seal]

<PAGE>

                                   EXHIBIT E

                       [FORM OF TRANSFEROR'S AFFIDAVIT]

                                                      Date:

Credit Suisse First Boston Mortgage Securities Corp.
Eleven Madison Avenue
New York, New York 10010

The Bank of New York

[Trustee's Address]

          Re:  Credit Suisse First Boston Mortgage Securities Corp.
               Mortgage Pass-Through Certificates, Series 1999-1

Ladies and Gentlemen:

     In connection with our disposition of the Class R Certificate issued
pursuant to the Trust Agreement dated as of October 29, 1999 (the "Trust
Agreement") between Credit Suisse First Boston Mortgage Securities Corp., as
depositor, and The Bank of New York, as trustee, relating to the Credit Suisse
First Boston Mortgage Securities Corp. Mortgage Pass-Through Certificates,
Series 1999-1, we certify that we have no actual knowledge that the transferee
is not a Permitted Transferee. All capitalized terms used herein shall have
the meaning given them in the Agreement.

                                           Very truly yours,


                                           ----------------------------
                                                Name of Transferor


                                           By: __________________________
                                           Name: ________________________
                                           Title: _______________________

<PAGE>

                                   EXHIBIT F

                      [FORM OF TRANSFER AFFIDAVIT FOR THE
                             CLASS R CERTIFICATE]




                                                 AFFIDAVIT PURSUANT TO
                                            SECTION 860E(e)(4) OF THE INTERNAL
                                            REVENUE CODE OF 1986, AS AMENDED

STATE OF                )
                        )  ss.:
COUNTY OF               )

              __________________________, being first duly sworn, deposes and
          says:

              1. The undersigned is an officer of Credit Suisse First Boston
          Mortgage Securities Corp., the proposed Transferee of an Ownership
          Interest in a Class R Certificates (the "Certificate") issued
          pursuant to the Trust Agreement, (the "Agreement"), relating to the
          above-referenced Series, by and between Credit Suisse First Boston
          Mortgage Securities Corp., as depositor (the "Depositor") and The
          Bank of New York, as Trustee. Capitalized terms used, but not
          defined herein or in Exhibit 1 hereto, shall have the meanings
          ascribed to such terms in the Agreement. The Transferee has
          authorized the undersigned to make this affidavit on behalf of the
          Transferee.

              2. That the Purchaser's Taxpayer Identification Number is
          _________________.

              3. That the Purchaser is not a "disqualified organization"
          within the meaning of Section 860E(e)(5) of the Internal Revenue
          code of 1986, as amended (the "Code"), or an ERISA Prohibited
          Holder, and will not be a "disqualified organization" as of [date of
          transfer], and that the purchaser is not acquiring the Credit Suisse
          First Boston Mortgage Securities Corp. Mortgage Pass-Through
          Certificates, Series 1999-1, Class R Certificates (the "Residual
          Certificates") for the account of, or as agent (including as a
          broker, nominee, or other middleman) for, any person or entity from
          which it has not received an affidavit substantially in the form of
          this affidavit. For these purposes, a "disqualified organization"
          means the United States, any state or political subdivision thereof,
          any foreign government, any international organization, any agency
          or instrumentality if all of its activities are subject to tax and a
          majority of its board of directors is not selected by such
          governmental entity), any cooperative organization furnishing
          electric energy or providing telephone service to persons in rural
          areas as described in Code Section 1381(a)(2)(C), or any
          organization (other than a farmers' cooperative described in Code
          Section 521) that is exempt from federal income tax unless such
          organization (other than a farmers' cooperative described in Code
          Section 521) that is exempt from federal income tax unless such
          organization is subject to the tax on unrelated business income
          imposed by Code Section 511. For these purposes, an "ERISA
          Prohibited Holder" means an employee benefit plan subject to the
          fiduciary provisions of the Employee Retirement Income Security Act
          of 1974, as amended ("ERISA"), and/or Code Section 4975 or any
          governmental plan, as defined in Section 3(32) of ERISA, subject to
          any federal, state or local law which is, to a material extent,
          similar to the foregoing provisions of ERISA or the Code
          (collectively, a "Plan") or a Person investing the assets of such a
          Plan.

              4. That the Purchaser historically has paid its debts as they
          have come due and intends to pay its debts as they come due in the
          future and the Purchaser intends to pay taxes associated with
          holding the Residual Certificates as it becomes due.

              5. That the Purchaser understands that it may incur tax
          liabilities with respect to the Residual Certificates in excess of
          cash flow generated by the Residual Certificates.

              6. That the Purchaser will not transfer the Residual
          Certificates to any person or entity from which the Purchaser has
          not received an affidavit substantially in the form of this
          affidavit and as to which the Purchaser has actual knowledge that
          the requirements set forth in paragraphs 3, 4 or 7 hereof are not
          satisfied or that the Purchaser knows or has reason to know does not
          satisfy the requirements set forth in paragraph 4 hereof.

              7. That the Purchaser (i) is not a Non-U.S. Person or (ii) is a
          Non-U.S. Person that holds the Residual Certificates in connection
          with the conduct of a trade or business within the United States and
          has furnished the transferor and the Trustee with an effective
          Internal Revenue Service Form 4224 or (iii) is a Non-U.S. Person
          that has delivered to both the transferor and the Trustee an opinion
          of a nationally recognized tax counsel to the effect that the
          transfer of the Residual Certificates to it is in accordance with
          the requirements of the Code and the regulations promulgated
          thereunder and that such transfer of the Residual Certificates will
          not be disregarded for federal income tax purposes. "Non-U.S.
          Person" means an individual, corporation, partnership or other
          person other than a citizen or resident of the United States, a
          corporation or partnership (including an entity treated as a
          corporation or partnership for U.S. federal income tax purposes)
          created or organized in or under the laws of the United States, any
          state thereof or the District of Columbia (except, in the case of a
          partnership, Treasury regulations are adopted that provide
          otherwise), an estate that is subject to U.S. federal income tax
          regardless of the source of its income, or a trust if a court within
          the United States is able to exercise primary supervision of the
          administration of the trust and one or more United States persons
          have the authority to control all substantial decisions of the
          trust.

              8. That the Purchaser agrees to such amendments of the Trust
          Agreement as may be required to further effectuate the restrictions
          on transfer of the Residual Certificates to such a "disqualified
          organization," an agent thereof or a person that does not satisfy
          the requirements of paragraphs 4, 5 and 7 hereof.

              9. That, if a "tax matters person" is required to be designated
          with respect to the REMIC, the Purchaser agrees to act as "tax
          matters person" and to perform the functions of "tax matters
          partner" of the REMIC pursuant to Section 2.04(c) of the Trust
          Agreement, and agrees to designate the Trustee as the Purchaser's
          agent in performing the functions of "tax matters person" and "tax
          matters partner."

<PAGE>

     IN WITNESS WHEREOF, the Purchaser has caused this instrument to be
executed on its behalf, pursuant to authority of its Board of Directors, by
its ___________________ this __th day of ______________.


                                     Credit Suisse First Boston Corporation


                                     By:____________________________________
                                     Name:
                                     Title:


     Personally appeared before me the above-named ________________, known or
proved to me to be the same person who executed the foregoing instrument and
to be the __________________ of the Purchaser, and acknowledged to me that he
executed the same as his free act and deed and the free act and deed of the
Purchaser.

     Subscribed and sworn before me this ___th day of _____________.


                                             ----------------------------
                                             Notary Public

                                             Count of ____________________

                                             State of _____________________

                                             My Commission expires the ____
                                        day of _______________, 19__

<PAGE>

                                                              EXHIBIT 1
                                                              to EXHIBIT F


                              Certain Definitions


     "Ownership Interest": As to any Certificate, any ownership interest in
such Certificate, including any interest in such Certificate as the Holder
thereof and any other interest therein, whether direct or indirect, legal or
beneficial, as owner or pledgee.

     "Permitted Transferee": (i) the United States, any State or political
subdivision thereof, or any agency or instrumentality of any of the foregoing,
(ii) a foreign government, International Organization or any agency or
instrumentality of either of the foregoing, (iii) an organization (except
certain farmers' cooperatives described in section 521 of the Code) which is
exempt from tax imposed by Chapter 1 of the Code (including the tax imposed by
section 511 of the Code on unrelated business taxable income) on any excess
inclusions (as defined in section 860E(c)(l) of the Code) with respect to any
Residual Certificate, (iv) rural electric and telephone cooperatives described
in section 1381(a)(2)(C) of the Code, (v) a Person that is not a citizen or
resident of the United States, a corporation or partnership (including an
entity treated as a corporation or partnership for U.S. federal income tax
purposes) created or organized in or under the laws of the United States, any
State thereof or the District of Columbia (except, in the case of a
partnership, Treasury regulations are adopted that provide otherwise), an
estate whose income from sources without the United States is includible in
gross income for United States federal income tax purposes regardless of its
connection with the conduct of a trade or business within the United States,
or a trust if a court within the United States is able to exercise primary
supervision over the administration of the trust and one or more United States
persons have the authority to control all substantial decisions of the trust
unless such Person has furnished the transferor and the Trustee with a duly
completed Internal Revenue Service Form 4224 or any applicable successor form,
and (vi) any other Person so designated by the Depositor based upon an Opinion
of Counsel that the Transfer of an Ownership Interest in a Class R
Certificates to such Person may cause the REMIC hereunder to fail to qualify
as a REMIC at any time that the Certificates are outstanding. The terms
"United States," "State" and "International Organization" shall have the
meanings set forth in section 7701 of the Code or successor provisions. A
corporation will not be treated as an instrumentality of the United States or
of any State or political subdivision thereof for these purposes if all of its
activities are subject to tax and, with the exception of the Federal Home Loan
Mortgage Corporation, a majority of its board of directors is not selected by
such government unit.

     "Person": Any individual, corporation, partnership, limited partnership,
joint venture, bank, limited liability company, association, joint-stock
company, trust (including any beneficiary thereof), unincorporated
organization or government or any agency or political subdivision thereof.

     "Transfer": Any transfer, sale, pledge, hypothecation or other form of
assignment of any Ownership Interest in a Certificate.

     "Transferee": Any Person who is acquiring by Transfer any Ownership
Interest in a Certificate.

<PAGE>

                                                                  EXHIBIT 2
                                                                  to EXHIBIT F


                 (a)   Section 4.02(e) of the Agreement

          (A)  Each Person holding or acquiring any Ownership Interest in a
               Residual Certificate shall be a Permitted Transferee and shall
               promptly notify the Trustee of any change or impending change
               in its status as a Permitted Transferee.

          (B)  In connection with any proposed Transfer of any Ownership
               Interest in a Residual Certificate, the Trustee shall require
               delivery to it, and shall not register the Transfer of any
               Residual Certificate until its receipt of, an affidavit (a
               "Transfer Affidavit " attached hereto as Exhibit E) from the
               proposed Transferee, in form and substance satisfactory to the
               Trustee, representing and warranting, among other things, that
               such Transferee is a Permitted Transferee, that it is not
               acquiring its Ownership Interest in the Residual Certificate
               that is the subject of the proposed Transfer as a nominee,
               trustee or agent for any Person that is not a Permitted
               Transferee, that for so long as it retains its Ownership
               Interest in a Residual Certificate, it will endeavor to remain
               a Permitted Transferee, and that it has reviewed the provisions
               of this Section 4.02(g) and agrees to be bound by them.

          (C)  Notwithstanding the delivery of a Transfer Affidavit by a
               proposed Transferee under clause (B) above, if a Responsible
               Officer of the Trustee who is assigned to this transaction has
               actual knowledge that the proposed Transferee is not a
               Permitted Transferee, no Transfer of an Ownership Interest in a
               Residual Certificate to such proposed Transferee shall be
               effected.

          (D)  Each Person holding or acquiring any Ownership Interest in a
               Residual Certificate shall agree (x) to require a Transfer
               Affidavit (in the form attached hereto as Exhibit F) from any
               other Person to whom such Person attempts to transfer its
               Ownership Interest in a Residual Certificate and (y) not to
               transfer its Ownership Interest unless it provides a Transferor
               Affidavit (in the form attached hereto as Exhibit E) to the
               Trustee stating that, among other things, it has no actual
               knowledge that such other Person is not a Permitted Transferee.

          (E)  Each Person holding or acquiring an Ownership Interest in a
               Residual Certificate, by purchasing an Ownership Interest in
               such Certificate, agrees to give the Trustee written notice
               that it is a "pass-through interest holder" within the meaning
               of temporary Treasury regulation Section 1.67-3T(a)(2)(i)(A)
               immediately upon acquiring an Ownership Interest in a Residual
               Certificate, if it is, or is holding an Ownership Interest in a
               Residual Certificate on behalf of, a "pass-through interest
               holder."

               (ii) The Trustee will register the Transfer of any Residual
          Certificate only if it shall have received the Transfer Affidavit
          and all of such other documents as shall have been reasonably
          required by the Trustee as a condition to such registration. In
          addition, no Transfer of a Residual Certificate shall be made unless
          the Trustee shall have received a representation letter from the
          Transferee of such Certificate to the effect that such Transferee is
          a Permitted Transferee.

               (iii) (A) If any purported Transferee shall become a Holder of
          a Residual Certificate in violation of the provisions of this
          Section 4.02(e), then the last preceding Permitted Transferee shall
          be restored, to the extent permitted by law, to all rights as holder
          thereof retroactive to the date of registration of such Transfer of
          such Residual Certificate. The Trustee shall be under no liability
          to any Person for any registration of Transfer of a Residual
          Certificate that is in fact not permitted by this Section 4.02(e) or
          for making any payments due on such Certificate to the holder
          thereof or for taking any other action with respect to such holder
          under the provisions of this Agreement.

               (B)  If any purported Transferee shall become a holder of a
                    Residual Certificate in violation of the restrictions in
                    this Section 4.02(e) and to the extent that the
                    retroactive restoration of the rights of the holder of
                    such Residual Certificate as described in clause (iii)(A)
                    above shall be invalid, illegal or unenforceable, then the
                    Trustee shall have the right, without notice to the holder
                    or any prior holder of such Residual Certificate, to sell
                    such Residual Certificate to a purchaser selected by the
                    Trustee on such terms as the Trustee may choose. Such
                    purported Transferee shall promptly endorse and deliver
                    each Residual Certificate in accordance with the
                    instructions of the Trustee. Such purchaser may be the
                    Trustee itself or any Affiliate of the Trustee. The
                    proceeds of such sale, net of the commissions (which may
                    include commissions payable to the Trustee or its
                    Affiliates), expenses and taxes due, if any, will be
                    remitted by the Trustee to such purported Transferee. The
                    terms and conditions of any sale under this clause
                    (iii)(B) shall be determined in the sole discretion of the
                    Trustee, and the Trustee shall not be liable to any Person
                    having an Ownership Interest in a Residual Certificate as
                    a result of its exercise of such discretion.

               (iv) The Trustee shall make available to the Internal Revenue
          Service and those Persons specified by the REMIC Provisions all
          information necessary to compute any tax imposed (A) as a result of
          the Transfer of an Ownership Interest in a Residual Certificate to
          any Person who is a Disqualified Organization, including the
          information described in Treasury regulations sections
          1.860D-1(b)(5) and 1.860E-2(a)(5) with respect to the "excess
          inclusions" of such Residual Certificate and (B) as a result of any
          regulated investment company, real estate investment trust, common
          trust fund, partnership, trust, estate or organization described in
          Section 1381 of the Code that holds an Ownership Interest in a
          Residual Certificate having as among its record holders at any time
          any Person which is a Disqualified Organization. Reasonable
          compensation for providing such information may be accepted by the
          Trustee.

               (v) The provisions of this Section 4.02(e) set forth prior to
          this subsection (v) may be modified, added to or eliminated,
          provided that there shall have been delivered to the Trustee at the
          expense of the party seeking to modify, add to or eliminate any such
          provision the following:

               (A) written notification from each Rating Agency to the effect
          that the modification, addition to or elimination of such provisions
          will not cause such Rating Agency to downgrade its then-current
          ratings of any Class of Certificates; and

               (B) an Opinion of Counsel, in form and substance satisfactory
          to the Trustee, to the effect that such modification of, addition to
          or elimination of such provisions will not cause the REMIC created
          hereunder to cease to qualify as a REMIC and will not cause the
          REMIC created hereunder to be subject to an entity-level tax caused
          by the Transfer of any Residual Certificate to a Person that is not
          a Permitted Transferee or (y) a Person other than the prospective
          transferee to be subject to a REMIC-tax caused by the Transfer of a
          Residual Certificate to a Person that is not a Permitted Transferee.

     The restrictions on Transfers of a Class R Certificates set forth in this
Section 4.02(e) shall cease to apply (and the applicable portions of the
legend on a Class R Certificate may be deleted) with respect to Transfers
occurring after delivery to the Trustee of an Opinion of Counsel, which
Opinion of Counsel shall not be an expense of the Trust Fund or the Trustee,
to the effect that the elimination of such restrictions will not cause any
REMIC hereunder to fail to qualify as a REMIC at any time that the
Certificates are outstanding or result in the imposition of any tax on the
Trust Fund, a Certificateholder or another Person. Each Person holding or
acquiring any Ownership Interest in the Class R Certificate hereby consents to
any amendment of this Agreement which, based on an Opinion of Counsel
furnished to the Trustee, is reasonably necessary (a) to ensure that the
record ownership of, or any beneficial interest in, a Class R Certificate is
not transferred, directly or indirectly, to a Person that is not a Permitted
Transferee and (b) to provide for a means to compel the Transfer of a Class R
Certificate which is held by a Person that is not a Permitted Transferee to a
Holder that is a Permitted Transferee.

     The preparation and delivery of all certificates and opinions referred to
above in this Section 4.02 in connection with transfer shall be at the expense
of the parties to such transfers.



<PAGE>

                               BROWN & WOOD LLP
                            One World Trade Center
                           New York, New York 10048
                           Telephone: (212) 839-5300
                           Facsimile: (212) 839-5599





                                                          November 11, 1999


VIA EDGAR

Securities and Exchange Commission
Judiciary Plaza
450 Fifth Street, N.W.
Washington, D.C. 20549


              Re:      Credit Suisse First Boston Mortgage Securities Corp.
                       Mortgage Pass-Through Certificates, Series 1999-1

Ladies and Gentlemen:

         On behalf of Credit Suisse First Boston Mortgage Securities Corp.
(the "Company"), we attach herewith for filing, pursuant to the Securities and
Exchange Act of 1934, as amended, the Company's Current Report on Form 8-K,
for the Trust Agreement in connection with the above-referenced transaction.



                                              Very truly yours,

                                              /s/ Robert A. Ladd

                                              Robert A. Ladd


Attachment


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