CS FIRST BOSTON MORT SEC CORP ADJ RATE ASSET BACK CER 1996-1
8-K, 1996-06-20
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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:  May 31, 1996
(Date of earliest event reported)

Commission File No. 33-99612-01




                    CS First Boston Mortgage Securities Corp.
- --------------------------------------------------------------------------------



           Delaware                                     13-3320910
- ----------------------------                ------------------------------------
  (State of Incorporation)                  (I.R.S. Employer Identification No.)




 55 East 52nd Street, New York, New York                 10055
- ------------------------------------------            -----------
 Address of principal executive offices               (Zip Code)




                                 (212) 909-2000
- --------------------------------------------------------------------------------
               Registrant's Telephone Number, including area code




- --------------------------------------------------------------------------------
              (Former name, former address and former fiscal year,
                          if changed since last report)



<PAGE>



ITEM 5.  Other Events
         ------------

     On May 31, 1996,  CS First Boston  Mortgage  Securities  Corp.,  a Delaware
corporation  (the  "Registrant"),  sold  Adjustable  Rate  Certificates,  Series
1996-1,  Class A-1 (the "Offered  Certificates"),  having an aggregate  original
principal balance of $305,580,227. The Offered Certificates were issued pursuant
to a Pooling Trust  Agreement,  dated as of May 31, 1996,  among the Registrant,
Norwest Bank Minnesota,  National Association, as Certificate Administrator (the
"Certificate  Administrator"),  The Chase Manhattan Bank (National Association),
as Trustee (the "Trustee"),  and Norwest Corporation,  as Tax Beneficial Holder,
(the  "Agreement"),  a copy of which is filed as an exhibit  hereto.  Adjustable
Rate Certificates, Series 1996-1, Class IO and Class R were also issued pursuant
to the Agreement.

     As of the date of initial issuance, the Offered Certificates evidenced 100%
of the  beneficial  ownership  interest  in a trust  fund  (the  "Trust  Fund"),
consisting  primarily  of (a) 13 classes  (or  portions  of classes) of mortgage
pass-through  certificates (the "Mortgage  Certificates"),  each one of which is
part of one of 11 series of mortgage pass-through certificates initially sold by
the Resolution Trust Corporation and acquired by the Registrant in the secondary
market,  (b) a reserve fund, (c) a yield support  agreement  provided by Norwest
Corporation  and  (d)  a  price  maintenance   agreement   provided  by  Norwest
Corporation.

     Interest  on  the  Offered   Certificates   will  be  distributed  on  each
Distribution  Date (as  defined  in the  Agreement).  Monthly  distributions  in
reduction of the principal balance of the Offered Certificates will be allocated
to the Offered  Certificates  in accordance with the priorities set forth in the
Agreement.  Payments  on  the  Mortgage  Certificates  will  be  unconditionally
guaranteed  as to payment of interest and  principal to the extent  described in
the  Agreement  pursuant to the terms and  conditions  of a  financial  guaranty
insurance policy issued by MBIA Insurance Corporation.

     An election will be made to treat the portion of the Trust Fund  consisting
of the Mortgage  Certificates as a real estate mortgage  investment  conduit for
federal  income  tax  purposes  (the  "REMIC").  The  Class  A-1  and  Class  IO
Certificates will be treated as "regular interests" in the REMIC and the Class R
Certificate will be treated as the "residual interest" in the REMIC.



<PAGE>



ITEM 7.  Financial Statements and Exhibits
         ---------------------------------
                   (c) Exhibits

Item 601(a)
of Regulation S-K
Exhibit No.                                          Description
- -----------------                                    -----------
         (EX-4)                       Pooling Trust  Agreement,  dated as of May
                                      31, 1996, among CS First  Boston  Mortgage
                                      Securities  Corp.,  as Depositor,  Norwest
                                      Bank Minnesota,  National Association,  as
                                      Certificate   Administrator,   The   Chase
                                      Manhattan Bank (National Association),  as
                                      Trustee, and  Norwest Corporation, as  Tax
                                      Beneficial Holder.



<PAGE>



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

                                    CS FIRST BOSTON MORTGAGE SECURITIES
                                      CORPORATION

May 31, 1996
                                    By:
                                           /s/  Gina Hubbell
                                         --   --------------
                                         Name:  Gina Hubbell
                                         Title: Vice President




<PAGE>




                                INDEX TO EXHIBITS
                                -----------------


                                                                   Paper (P) or
Exhibit No.     Description                                       Electronic (E)
- ----------      -----------                                       --------------

  (EX-4)        Pooling Trust Agreement, dated as of                    E
                May 31, 1996, among CS First Boston
                Mortgage Securities Corp., as Depositor,
                Norwest Bank Minnesota, National
                Association, as Certificate Administrator,
                The Chase Manhattan Bank (National
                Association), as Trustee, and Norwest
                Corporation, as Tax Beneficial Holder.



<PAGE>

                                    EXHIBIT 4
                                    ---------








================================================================================


                   CS FIRST BOSTON MORTGAGE SECURITIES CORP.,

                                    DEPOSITOR



                  NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION,

                            CERTIFICATE ADMINISTRATOR


                 THE CHASE MANHATTAN BANK (NATIONAL ASSOCIATION)

                                     TRUSTEE


                                       AND


                              NORWEST CORPORATION,
                              TAX BENEFICIAL HOLDER

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




                             POOLING TRUST AGREEMENT


                            Dated as of May 31, 1996



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


                                  $305,580,227


                          Adjustable Rate Certificates,
                                  Series 1996-1



================================================================================

<PAGE>

                               TABLE OF CONTENTS

                                                                            Page
                                                                            ----

ARTICLE I        Definitions............................................     1

  Section 1.01.  Definitions............................................     1
  Section 1.02.  Interest Calculation; Mortgage Certificate
                 Principal Balance......................................    16

ARTICLE II       Conveyance of Mortgage Certificates and Original
                 Issuance of Certificates...............................    17

  Section 2.01.  Conveyance of the Mortgage Certificates................    17
  Section 2.02.  Issuance of the Certificates...........................    17
  Section 2.03.  Representations and Warranties of the Depositor........    17
  Section 2.04.  REMIC Designations and Related Matters.................    19

ARTICLE III      Administration of the Trust............................    20

  Section 3.01.  Collection of Payments on Mortgage Certificates;
                 Certificate Account....................................    20
  Section 3.02.  Distributions..........................................    22
  Section 3.03.  Determination Of LIBOR.................................    24
  Section 3.04.  Statements to Certificateholders.......................    25
  Section 3.05.  Notices to Trustee.....................................    28
  Section 3.06.  Reserve Fund...........................................    28
  Section 3.07.  Mandatory Auction......................................    29
  Section 3.08.  Yield Support Agreement................................    31
  Section 3.08.  Price Maintenance Agreement............................    32
  Section 3.09.  Notices Under Policy...................................    33

ARTICLE IV       The Certificates.......................................    34

  Section 4.01.  The Certificates.......................................    34
  Section 4.02.  Registration of and Limitations on Transfer and
                 Exchange of Certificates...............................    36
  Section 4.03.  Mutilated, Destroyed, Lost or Stolen Certificates......    39
  Section 4.04.  Persons Deemed Owners..................................    40
  Section 4.05.  Definitive Certificates................................    40
  Section 4.06.  Notices to Clearing Agency.............................    40

ARTICLE V        The Certificate Administrator..........................    41

  Section 5.01.  Representations and Warranties of the Certificate
                 Administrator..........................................    41
  Section 5.02.  Directions to the Certificate Administrator............    41

<PAGE>

                                                                            Page
                                                                            ----

  Section 5.03.  Returns................................................    41
  Section 5.04.  Election of REMIC Status...............................    41
  Section 5.05.  Compliance with REMIC Provisions.......................    42
  Section 5.06.  Terms of REMIC Interests and Tax Reporting.............    42
  Section 5.07.  Limitation on Liability of the Certificate
                 Administrator and Others...............................    43
  Section 5.08.  Merger or Consolidation of the Certificate
                 Administrator; Transfer of Duties......................    43
  Section 5.09.  Reports by Certificate Administrator...................    44
  Section 5.10.  Certificate Administrator's Fees.......................    45
  Section 5.11.  Termination of Certificate Administrator...............    45

ARTICLE VI       The Trustee............................................    47

  Section 6.01.  Representation and Warranties..........................    47
  Section 6.02.  Directions to the Trustee..............................    47
  Section 6.03.  Liability of the Trustee...............................    47
  Section 6.04.  Merger or Consolidation of the Trustee.................    47
  Section 6.05.  Limitation on Liability of the Trustee and Others......    49
  Section 6.06.  Delegation of Duty by the Trustee......................    50
  Section 6.07.  Trustee's Fees.........................................    50
  Section 6.08.  Resignation and Removal of the Trustee.................    51
  Section 6.09.  Successor Trustee......................................    51
  Section 6.10.  Compliance with REMIC Provisions.......................    52
  Section 6.11.  Opposition of Recharacterization.......................    52

ARTICLE VII      Termination............................................    53

  Section 7.01.  Termination Upon Distribution to Certificateholders....    53
  Section 7.02.  Failure of Certificateholders to Surrender
                 Certificates...........................................    53
  Section 7.03.  Additional Termination Requirements....................    54

ARTICLE VIII     The Policy and the Certificate Insurer.................    55

  Section 8.01.  Maintenance of the Policy; Collections Thereunder......    55
  Section 8.02.  Certificate Insurer's Direction of Insolvency
                 Proceedings............................................    55
  Section 8.03.  Certificate Insurer Deemed Holder......................    55
  Section 8.04.  Termination of Certificate Insurer's Rights............    56

ARTICLE IX       Miscellaneous Provisions...............................    57

  Section 9.01.  Amendment..............................................    57
  Section 9.02.  Limitation on Rights of Certificateholders.............    58
  Section 9.03   Limitation on Liability of the Depositor and Others....    59
  Section 9.04.  Governing Law..........................................    59
  Section 9.05.  Notices................................................    59

<PAGE>
                                                                            Page
                                                                            ----

  Section 9.06.  Severability of Provisions.............................    59
  Section 9.07.  Certificates Nonassessable and Fully Paid..............    60
  Section 9.08.  Execution in Counterparts..............................    60
  Section 9.09.  Special Notices to the Rating Agencies.................    60

<PAGE>

                                    SCHEDULES

Schedule I       Mortgage Certificates

                                    EXHIBITS

Exhibit A        Form of Class A-1 Certificate
Exhibit B        Form of Class IO Certificate
Exhibit C        Form of Class R Certificate
Exhibit D        Form of Reverse of Certificate
Exhibit E        Form of Transfer Affidavit for Qualified Institutional Buyers
Exhibit F        Form of Transfer Affidavit for Institutional Accredited
                 Investors
Exhibit G        Affidavit Pursuant to Section 860E(e)(4) of the Internal
                 Revenue Code of 1986, as amended, and for Non-ERISA Investors
Exhibit H        Letter from Transferor of Class R Certificate
Exhibit I        Form of Yield Support Agreement
Exhibit J        Form of Price Maintenance Agreement
Exhibit K        Form of Policy
Exhibit L        Form of Insurance Agreement
Exhibit M        Form of Due Bill



<PAGE>



     This Pooling Trust Agreement (this "Trust Agreement" or this  "Agreement"),
dated as of May 31,  1996,  by and  among CS FIRST  BOSTON  MORTGAGE  SECURITIES
CORP.,  a Delaware  corporation,  as Depositor (the  "Depositor"),  NORWEST BANK
MINNESOTA,  NATIONAL ASSOCIATION, as Certificate Administrator (the "Certificate
Administrator"), THE CHASE MANHATTAN BANK (NATIONAL ASSOCIATION), as Trustee (in
such capacity, the "Trustee"), and NORWEST CORPORATION, as Tax Beneficial Holder
(the "Tax Beneficial Holder").


                                WITNESSETH THAT:

     In consideration of the mutual agreements herein contained,  the Depositor,
the Certificate  Administrator,  the Trustee and the Tax Beneficial Holder agree
as follows:


                                    ARTICLE I

                                   Definitions
                                   -----------

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

     Affiliate:   With  respect  to  any  specified  Person,  any  other  Person
controlling or controlled by or under common control with such specified Person.
For the  purposes of this  definition,  "control"  when used with respect to any
specified  Person means the power to direct the  management and policies of such
Person,  directly  or  indirectly,  whether  through  the  ownership  of  voting
securities,   by  contract  or  otherwise,   and  the  terms  "controlling"  and
"controlled" have meanings correlative to the foregoing.

     Aggregate  Mortgage  Certificate  Principal  Balance:  With  respect to any
Underlying  Series  Distribution  Date,  the  sum  of the  Mortgage  Certificate
Principal Balances of all the Mortgage Certificates.

     All or Nothing Bids:  As defined in Section 3.07(b).

     ARM Certificates:  Those Mortgage  Certificates  representing  interests in
adjustable rate Mortgage Loans.

     Auction Date: The first Business Day of the month immediately preceding any
Distribution Date after the Initial Auction Date.

     Auction Proceeds:  As defined in Section 3.07(g).


<PAGE>

     Available  Reserve Fund Amount:  On any  Distribution  Date,  the amount on
deposit in the Reserve Fund, including any income or gain from any investment of
funds in the  Reserve  Fund (net of any  losses  from such  investment)  and any
payments  made by the Yield Support  Counterparty  pursuant to the Yield Support
Agreement on such Distribution Date.

     Beneficial Owner: With respect to a Book-Entry Certificate,  the Person who
is the  beneficial  owner of such  Book-Entry  Certificate,  as reflected on the
books of the Clearing Agency, or on the books of a Person maintaining an account
with such Clearing Agency (directly or as an indirect participant, in accordance
with the rules of such  Clearing  Agency),  as the case may be. The  Certificate
Administrator shall not be liable for any determination made by it in good faith
that any Person is a Beneficial Owner.

     Bids:  As defined in Section 3.07(b).

     Book-Entry  Certificate:  Any of the  Class  A-1  Certificates,  beneficial
ownership and  transfers of which shall be evidenced by, and made through,  book
entries by the Clearing Agency as described in Section 4.01(b).

     Business Day: Any day that is not a Saturday,  Sunday, holiday or other day
on which commercial  banking  institutions in New York, New York or the city and
state in which the  Trustee's or  Certificate  Administrator's  corporate  trust
office is located are  authorized  or obligated by law or executive  order to be
closed.

     Certificate:  Any one of the Class  A-1,  Class IO or Class R  Certificates
executed by the Certificate Administrator in substantially the form set forth in
Exhibit A, Exhibit B or Exhibit C, respectively, hereto.

     Certificate  Account: The trust account established and maintained pursuant
to Section 3.01(a).  Funds deposited in the Certificate Account shall be held in
trust for the benefit of the  Certificateholders  for the uses and  purposes set
forth in Article III hereof.

     Certificate Administrator: Norwest Bank Minnesota, National Association, or
its successor in interest or any successor Certificate  Administrator  appointed
pursuant to Section 5.11 hereof.

     Certificate Insurer:  MBIA Insurance Corporation, or its successor.

     Certificate Insurer Default: Any failure of the Certificate Insurer to make
payments under the Policy in accordance with its terms.

     Certificate  Insurer Insolvency:  Any of the following:  (i) the entry of a
decree or order of a court or  agency  having  jurisdiction  in  respect  of the
Certificate  Insurer in an involuntary  case under any present or future federal
or state  bankruptcy,  insolvency or similar law or appointing a conservator  or
receiver or liquidator or other similar  official of the Certificate  Insurer or
of any  substantial  part of its  property,  or the entering of an order for the
winding up or  liquidation  of the  affairs of the  Certificate  Insurer and the
continuance  of any such decree or order  undischarged  or unstayed and in force
for a period of 90 consecutive days; (ii) the Certificate  Insurer shall consent
to the  appointment  of a conservator or receiver or liquidator or other similar
official  in any  insolvency,  readjustment  of debt,  marshaling  of assets and
liabilities or similar  proceedings of or relating to the Certificate Insurer or
of or  relating  to all or  substantially  all of its  property;  or  (iii)  the
Certificate  Insurer  shall  admit in  writing  its  inability  to pay its debts
generally as they become due, file a petition to take  advantage of or otherwise
voluntarily  commence  a case or  proceeding  under any  applicable  bankruptcy,
insolvency,  reorganization or other similar statute, make an assignment for the
benefit of its creditors, or voluntarily suspend payment of its obligations.

     Certificate Register:  As defined in Section 4.02.

     Certificateholder  or Holder:  The person in whose  name a  Certificate  is
registered in the Certificate  Register,  except that, solely for the purpose of
giving any consent pursuant to this Trust Agreement,  any Certificate registered
in the  name  of the  Depositor  or any  affiliate  shall  be  deemed  not to be
outstanding,  unless 100% of the  Percentage  Interests of such Class is held by
one or both of such Persons.


<PAGE>

     Class: All Certificates whose form is identical except for variation in the
Percentage Interest evidenced thereby.

     Class A-1 Certificate: A Certificate designated as a Class A-1 Certificate.

     Class A-1  Pass-Through  Rate:  During the initial Interest Accrual Period,
shall be 5.71047% per annum, and during each succeeding  Interest Accrual Period
shall be 0.23% in excess of LIBOR.

     Class A-1 Retirement Amount: With respect to any Distribution Date, the sum
of (i) the  then-outstanding  Principal  Balance of the Class A-1  Certificates,
together with interest thereon at the then Class A-1  Pass-Through  Rate for the
related Interest Accrual Period,  plus (ii) any unpaid Interest Shortfall Amount
with respect to the Class A-1 Certificates.  With the approval of the Holders of
at least 51% of the Voting  Interest of the Class A-1  Certificates  obtained in
accordance  with Section  3.07(a),  the Class A-1 Retirement  Amount shall equal
only the amount described in clause (i) of the preceding sentence.

     Class  IO  Certificate:   The  Certificate   designated  as  the  Class  IO
Certificate.

     Class  IO  Deferred  Interest  Carryforward  Amount:  With  respect  to any
Distribution  Date,  the  excess of the  aggregate  amount by which the  Optimal
Interest  Amount of the Class IO Certificate  was reduced in respect of Deferred
Interest on all prior Distribution  Dates over the amounts actually  distributed
to the Class IO Certificate on all prior  Distribution Dates pursuant to Section
3.02(b)(ii) of this Trust  Agreement;  provided  however,  that if the Principal
Balance of the Class A-1 Certificates is determined pursuant to clause (a)(y) of
the definition thereof (that is, the amount calculated pursuant to clause (a)(y)
is less than the amount  calculated  pursuant  to clause  (a)(x)),  the Class IO
Deferred Interest Carryforward Amount shall be zero.


<PAGE>

     Class IO  Notional  Amount:  As of any  Distribution  Date,  the  Aggregate
Mortgage Certificate Balance as of the first Underlying Series Distribution Date
occurring  in  such  Interest   Accrual   Period   (without   giving  effect  to
distributions on the Mortgage Certificates on such date).

     Class IO Pass-Through Rate: For any Interest Accrual Period, the excess, if
any, of (X) the Effective Quarterly Mortgage Certificate  Pass-Through Rate over
(Y) the Class A-1 Pass-Through Rate for such Interest Accrual Period.

     Class R Certificate: A Certificate designated as a Class R Certificate.

     Clean-Up Payment: As defined in Section 7.01.

     Clearing Agency: An organization registered as a "clearing agency" pursuant
to Section 17A of the Securities  Exchange Act of 1934, as amended.  The initial
Clearing Agency shall be The Depository Trust Company.

     Clearing Agency Participant:  A broker, dealer, bank, financial institution
or other  Person for whom a Clearing  Agency  effects  book-entry  transfers  of
securities deposited with the Clearing Agency.

     Closing Date: May 31, 1996.

     Code: The Internal  Revenue Code of 1986, as it may be amended from time to
time, any successor  statutes  thereto,  and applicable  U.S.  Department of the
Treasury temporary or final regulations promulgated thereunder.

     Collection  Period: For any Distribution Date, the period commencing on the
day  after  the  preceding  Distribution  Date  (or,  in the  case of the  first
Collection Period, on the Cut-off Date) and ending on such Distribution Date.

     Commission: The Securities and Exchange Commission.

     Corporate   Trust  Office:   The  principal   office  of  the   Certificate
Administrator  and Registrar at which at any particular time its corporate trust
business shall be  administered,  which office at the Closing Date is located at
Sixth Street and Marquette  Avenue,  Minneapolis,  Minnesota  55479-0069;  Attn:
Corporate Trust Department.

     Credit  Event:  As to any Fixed Rate  Certificate,  the  allocation  of any
shortfall  or loss to such  Fixed  Rate  Certificate  or the  occurrence  of any
downgrade of the rating of such Fixed Rate Certificate.

     Cut-off  Date:  April 28, 1996  (following  distributions  on the  Mortgage
Certificates  occurring on the Underlying Series  Distribution Date occurring in
April 1996).

     Deferred  Interest:  With respect to any Distribution  Date, the sum of the
amounts designated as deferred interest  allocated to any Mortgage  Certificates
on the  Mortgage  Certificate  Distribution  Date  Statements  relating  to each
Underlying  Series  Distribution  Date occurring  during the related  Collection
Period.


<PAGE>

     Definitive Certificates: As defined in Section 4.05.

     Depositor:   CS  First  Boston  Mortgage   Securities   Corp.,  a  Delaware
corporation, or its successor in interest.

     Distribution  Date: The 28th day of each January,  April, July and October,
beginning  in July 1996 or, if such day is not a  Business  Day,  the  following
Business Day;  provided that, in the event that any  Distribution  Date falls on
the same day as an Underlying  Series  Distribution  Date, the Distribution Date
may be delayed under the circumstances set forth in Section 3.01(f).

     Effective  Quarterly  Mortgage  Certificate   Pass-Through  Rate:  For  any
Interest Accrual Period, the product of (x) the weighted average of the Weighted
Average  Mortgage  Certificate  Pass-Through  Rates  for each of the  Underlying
Series  Distribution  Dates that occurs during the Collection  Period related to
such Interest  Accrual Period,  weighted on the basis of the Aggregate  Mortgage
Certificate  Principal Balance for each such Underlying Series Distribution Date
(minus  0.10%  on any  Distribution  Date as to which an  Extension  Premium  is
payable),  (y) the Mortgage Certificate Factor and (z) a fraction, the numerator
of which is 90 and the denominator of which is the actual number of days elapsed
during such Interest Accrual Period.

     Eligible Account:  An account that is any of the following:  (i) maintained
with a depository  institution the debt  obligations of which have been rated by
each Rating Agency in its highest rating available,  (ii) an account or accounts
in a depository  institution  in which such  accounts  are fully  insured to the
limits established by the FDIC, provided that any deposits not so insured shall,
to the extent  acceptable  to each Rating  Agency,  as evidenced in writing,  be
maintained  such that (as  evidenced  by an Opinion of Counsel  delivered to the
Trustee and each Rating Agency) the registered  Holders of  Certificates  have a
claim with  respect to the funds in such account or a perfected  first  security
interest   against  any   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  segregated  trust  account or accounts  maintained  in the
corporate trust department of Norwest Bank Minnesota,  National Association,  or
(iv) an account or  accounts  of a  depository  institution  acceptable  to each
Rating Agency (as evidenced by written  confirmation  of each Rating Agency that
use of any such  account as the  Certificate  Account will not reduce the rating
assigned to the Class A-1  Certificates by such Rating Agency below the lower of
the  then-current  rating or the rating assigned to such  Certificates as of the
Closing Date by such Rating Agency).

     Eligible  Investments:  At any  time,  any  one or  more  of the  following
obligations  and  securities  which shall mature not later than the Business Day
preceding the  Distribution  Date next  succeeding the date of such  investment,
provided  that such  investments  are of a type that would qualify as "cash flow
investments" as defined in Code Section 860G(a)(6):


<PAGE>

     (i) direct  obligations  of, and  obligations  fully  guaranteed for timely
payment  by,  the United  States of  America,  the  Federal  Home Loan  Mortgage
Corporation,  the Federal National Mortgage  Association,  the Federal Home Loan
Banks or any agency or  instrumentality  of the United  States of  America,  the
obligations  of which are  backed by the full  faith  and  credit of the  United
States of America;

     (ii) (A) demand and time deposits in,  certificates of deposit of, banker's
acceptances  issued by or federal funds sold by any  depository  institution  or
trust company  (including the  Certificate  Administrator,  the Trustee or their
agents acting in their respective commercial capacities)  incorporated under the
laws of the  United  States of  America  or any State  thereof  and  subject  to
supervision and examination by federal and/or state  authorities,  so long as at
the  time of such  investment  or  contractual  commitment  providing  for  such
investment,  such  depository  institution  or  trust  company  has a long  term
unsecured  debt rating of at least A1 by Moody's and a short term unsecured debt
rating in the highest  available  rating category of each of the Rating Agencies
and provided that each such investment has an original  maturity of no more than
365 days,  and (B) any other  demand or time  deposit or deposit  which is fully
insured by the Federal Deposit Insurance Corporation;

     (iii) repurchase obligations with a term not to exceed 90 days with respect
to any security described in clause (i) above and entered into with a depository
institution  or trust  company  (acting  as a  principal)  rated A1 or higher by
Moody's  and  Prime-1  by Moody's  and rated in the  highest  short term  rating
category of S&P; provided, however, that collateral transferred pursuant to such
repurchase  obligation  must (A) be valued  weekly at current  market price plus
accrued interest,  (B) pursuant to such valuation,  equal, at all times, 105% of
the cash  transferred  by the  Certificate  Administrator  in exchange  for such
collateral and (C) be delivered to the Certificate Administrator or an agent for
the Certificate Administrator, in such a manner as to accomplish perfection of a
security interest in the collateral by possession of certificated securities;

     (iv)  securities  bearing  interest  or sold at a  discount  issued  by any
corporation  incorporated  under the laws of the United States of America or any
State  thereof  which  has a long term  unsecured  debt  rating  in the  highest
available  rating  category  of each of the Rating  Agencies at the time of such
investment;

     (v) commercial paper having an original  maturity of less than 365 days and
issued by an  institution  having a long  term  unsecured  debt  rating of A1 by
Moody's and a short term unsecured debt rating in the highest  available  rating
category of each of the Rating Agencies at the time of such investment;


<PAGE>

     (vi) a guaranteed  investment  contract  approved in writing by each of the
Rating Agencies and issued by an insurance company or other corporation having a
long term unsecured debt rating in the highest available rating category of each
of the Rating Agencies at the time of such investment;

     (vii) money market funds having ratings in the highest  available long term
rating category of Moody's and the highest  available  rating category of S&P at
the time of such investment which invest only in other Eligible Investments; any
such money market funds which provide for demand  withdrawals being conclusively
deemed to satisfy any maturity  requirements for Eligible  Investments set forth
in the Indenture; and

     (viii) any investment approved in writing by each of the Rating Agencies.

     ERISA: The Employee Retirement Income Security Act of 1974, as amended, and
the rules and regulations promulgated thereunder.

     ERISA Plan: Any Person which is an employee benefit plan within the meaning
of Section 3(3) of ERISA.

     ERISA Prohibited Holder: As defined in Section 4.02(d).

     Extension Premium: As defined in Section 3.01(d).

     Extension  Premium  Account:  The trust account  established and maintained
pursuant to Section  3.01(d).  Funds deposited in the Extension  Premium Account
shall be held in trust for the benefit of the Certificate Insurer.

     Final Distribution  Amount: With respect to the Distribution Date following
the date on which the Trustee agrees to sell the Mortgage  Certificates pursuant
to the  provisions of Section 3.07, the excess of (X) the sum of (i) the Auction
Proceeds,  (ii) all payments  received by the Certificate  Administrator  on the
Mortgage  Certificates during the related Collection Period,  (iii) any Guaranty
Payments received during the related Collection Period,  (iv) interest earned on
amounts invested in the Certificate  Account,  (v) all amounts on deposit in the
Reserve Fund (up to the excess of the Class A-1  Retirement  Amount  (determined
pursuant  to the first  sentence  of the  definition  thereof)  over the amounts
described in clauses (i), (ii), (iii) and (iv) above and the amount described in
clause (Y) below) and (vi) any amount payable pursuant to the Price  Maintenance
Agreement over (Y) the Extension  Premium,  if any, payable with respect to such
Distribution Date.

     Final  Distribution  Date:  The  Distribution  Date set forth in the notice
delivered by the  Certificate  Administrator  of the final  distribution  on the
Certificates pursuant to Section 7.01.

     Final  Interest  Shortfall   Distribution   Amount:  With  respect  to  the
Distribution  Date  following  the date on which the Trustee  agrees to sell the
Mortgage  Certificates pursuant to the provisions of Section 3.07, the lesser of
(i) the unpaid Interest  Shortfall Amount of the Class A-1 Certificates and (ii)
the excess if any of the Final Distribution  Amount over the sum of the Interest
Accrual Amount of the Class A-1 Certificates for such  Distribution Date and the
then-outstanding Principal Balance of the Class A-1 Certificates.

     Fixed Rate Certificates: Those Mortgage Certificates representing interests
in fixed rate Mortgage Loans.


<PAGE>

     Guaranty Payment:  With respect to any Underlying Series Distribution Date,
(i) the sum of (X) the excess of the aggregate  amount due in respect of current
interest on the Mortgage  Certificates  on such Underlying  Series  Distribution
Date over the amount actually  distributed in respect of current interest on the
Mortgage  Certificates on such Underlying  Series  Distribution Date and (Y) the
amount,  if any,  of the  excess  of the  Principal  Balance  of the  Class  A-1
Certificates   (reduced  by  principal   previously  received  on  the  Mortgage
Certificates  or paid by the  Certificate  Insurer during the Collection  Period
during which such Underlying Series Distribution Date occurs) over the Aggregate
Mortgage  Certificate  Principal Balance for such Underlying Series Distribution
Date (after giving effect to principal  balance  reductions  with respect to the
Mortgage  Certificates on such  Underlying  Series  Distribution  Date and after
increasing  such amount by the amount of  Deferred  Interest  allocated  to such
Mortgage  Certificates on such Underlying Series Distribution Date) and (ii) any
Preference Amount.

     Guaranty  Payment  Account:  The trust account  established  and maintained
pursuant to Section  3.01(e).  Funds  deposited in the Guaranty  Payment Account
shall be held in trust for the  benefit of  Certificateholders  for the uses and
purposes set forth in Article III hereof.

     Holder: See "Certificateholder."

     Initial Auction Date: The first Business Day of April 1999.

     Insurance Agreement:  The insurance agreement,  in the form attached hereto
as Exhibit L, which the Trustee is hereby directed to execute in its capacity as
Trustee, and any permitted amendment thereof.

     Interest  Accrual  Amount:  As to any  Distribution  Date and the Class A-1
Certificates,  an amount equal to the lesser of (i) the Optimal  Interest Amount
of the Class  A-1  Certificates  for such  Distribution  Date and (ii)  Interest
Available Funds for such Distribution Date.

     As to any Distribution  Date and the Class IO Certificate,  an amount equal
to the lesser of (i) the Optimal Interest Amount of the Class IO Certificate for
such Distribution Date and (ii) the excess of Interest  Available Funds for such
Distribution  Date over the sum of the Optimal  Interest Amount of the Class A-1
Certificates and the Interest Shortfall Amount of the Class A-1 Certificates, in
each case for such Distribution Date.

     The Class R Certificate does not accrue interest.

     Interest Accrual Period: With respect to each Distribution Date, the period
commencing on the 28th day of the third month  preceding the month in which such
Distribution  Date  occurs and ending on the 27th day of the month in which such
Distribution Date occurs;  provided, that with respect to the first Distribution
Date, the Interest Accrual Period shall commence on the Cut-off Date.


<PAGE>

     Interest Available Funds: With respect to any Distribution Date, the excess
of (X) the sum of (a) all  payments  in  respect  of  interest  received  by the
Certificate  Administrator  on the  Mortgage  Certificates  during  the  related
Collection  Period  (other than any amounts in respect of overdue  interest on a
Mortgage  Certificate as to which the Certificate  Insurer has previously made a
Guaranty Payment), (b) the interest portion of all Guaranty Payments received by
the Certificate Administrator during the related Collection Period, (c) interest
earned on  amounts  invested  in the  Certificate  Account,  (d) all  amounts on
deposit in the Reserve Fund (up to the excess of the Optimal Interest Amount and
the  Interest  Shortfall  Amount of the Class A-1  Certificates  and the  amount
described  in clause (Y) below over the  amounts  in  clauses  (a),  (b) and (c)
above) and (e) the portion of any Clean-Up Payment representing current interest
over  (Y)  the  Extension  Premium,   if  any,  payable  with  respect  to  such
Distribution Date.

     Interest Available Funds Allocation: As defined in Section 3.02(b).

     Interest  Shortfall  Amount:  With respect to any Distribution Date and the
Class A-1 or Class IO  Certificate,  the  amount by which the  Optimal  Interest
Amounts  for such Class in respect  of all prior  Distribution  Dates is greater
than the Interest  Available  Funds  actually  distributed to such Class on such
prior  Distribution  Dates  pursuant  to Section  3.02 of this Trust  Agreement,
together,  in the case of the  Class A-1  Certificates,  with  interest  accrued
thereon at the Class A-1  Pass-Through  Rate in effect for each Interest Accrual
Period during which the Interest Shortfall Amount remains unpaid.

     Investment Representation Letter: As defined in Section 4.02(b).

     LIBOR: For any Interest Accrual Period,  the London interbank  offered rate
for three-month Eurodollar deposits determined by the Certificate  Administrator
for each Interest Accrual Period in accordance with Section 3.03.

     LIBOR Reset Date: The second London  Business Day prior to the first day of
each Interest Accrual Period.

     Line Item Bids: As defined in Section 3.07(b).

     London  Business  Day: A day on which banks are open for dealing in foreign
currency exchange in London and New York City.

     Moody's: Moody's Investors Service, Inc., or its successor in interest.

     Mortgage  Certificate:  Each  class  or  portion  of a  class  of  mortgage
pass-through  certificates  originally sold by the RTC indicated in the table on
Schedule I hereto under  "Classes of  Certificates,"  each issued as part of the
series of mortgage pass-through  certificates indicated opposite such classes in
the table on Schedule I hereto under "Series Designation."

     Mortgage  Certificate  Distribution  Date  Statement:  With  respect to the
Mortgage  Certificates,   the  report  provided  to  holders  of  such  Mortgage
Certificates  in  connection  with  each  Underlying  Series  Distribution  Date
pursuant to the related Pooling and Servicing Agreement.


<PAGE>

     Mortgage Certificate Factor: With respect to any Interest Accrual Period, a
fraction,  the numerator which is the arithmetic mean of the Aggregate  Mortgage
Certificate  Balances for each Underlying Series  Distribution Date occurring in
the related  Collection  Period and the  denominator  of which is the  Aggregate
Mortgage Certificate Balance as of the first Underlying Series Distribution Date
occurring  in  the  related   Collection   Period   (without  giving  effect  to
distributions on the Mortgage Certificates on such date).

     Mortgage  Certificate  Pass-Through  Rate:  With  respect  to any  Mortgage
Certificate and any Underlying Series  Distribution  Date, the pass-through rate
used to calculate  interest  distributions  on such  Mortgage  Certificate  with
respect to such Underlying Series Distribution Date.

     Mortgage  Certificate  Prepayment Interest  Shortfall:  With respect to any
Underlying Series Distribution Date and any Mortgage Certificate, the sum of the
amounts  of  any  interest  shortfall   designated  as  a  "Prepayment  Interest
Shortfall" or a "Relief Act Shortfall" allocated to such Mortgage Certificate on
the Mortgage Certificate Distribution Date Statement relating to each Underlying
Series Distribution Date occurring during the related Collection Period.

     Mortgage  Certificate  Principal  Balance:  With  respect to each  Mortgage
Certificate and any Underlying Series  Distribution  Date, the principal balance
of  such  Mortgage   Certificate   as  reported  on  the  Mortgage   Certificate
Distribution  Date Statement  relating to such  Underlying  Series  Distribution
Date.

     Mortgage  Loan  Servicer:  With  respect to any Mortgage  Loan,  the Person
performing  the duties of servicer or master  servicer  in  accordance  with the
related Pooling and Servicing Agreement.

     Mortgage Loan Trustee: With respect to any Mortgage Certificate, the Person
performing  the  duties of  trustee  under the  related  Pooling  and  Servicing
Agreement.

     Mortgage  Loans:  The  conventional,   monthly  pay,  one-  to  four-family
residential first mortgage loans that constitute the primary assets of the trust
funds formed by the Pooling and Servicing Agreements.

     Non-permitted Foreign Holder: As defined in Section 4.02(d).

     Non-U.S. Person: As defined in Section 3.02(e).

     Notice  of  Claim:   The  notice  to  be  delivered   by  the   Certificate
Administrator to the Certificate  Insurer with respect to any Underlying  Series
Distribution Date as to which there is an amount owed by the Certificate Insurer
pursuant to clauses (i) or (ii) of the  definition  of Guaranty  Payment,  which
shall be in the form attached as Exhibit A to the Policy.


<PAGE>

     Officer's Certificate:  With respect to any Person, a certificate signed by
the  Chairman  of the  Board,  the  President  or a Vice  President,  and by the
Treasurer,  the  Secretary  or one  of the  Assistant  Treasurers  or  Assistant
Secretaries  of  such  Person  (or,  in the  case  of a  Person  which  is not a
corporation, signed by the person or persons having like responsibilities).

     Opinion of Counsel:  A written  opinion of counsel,  who may be counsel for
the Depositor, the Certificate Administrator or the Trustee.

     Optimal  Interest  Amount:  As to any  Distribution  Date and the Class A-1
Certificates,  an amount  equal to (a) the  product of (i) the  product of (X) a
fraction,  the  numerator  of which is the number of days elapsed in the related
Interest  Accrual  Period and the  denominator of which is 360 and (Y) the Class
A-1  Pass-Through  Rate for the  related  Interest  Accrual  Period and (ii) the
Principal  Balance of the Class A-1  Certificates  (before  giving effect to any
adjustment to the  Principal  Balance of such Class on such  Distribution  Date)
less (b) such  Class's  allocable  share (as  described  below) of any  Mortgage
Certificate Prepayment Interest Shortfall and any Deferred Interest.

     As to any Distribution  Date and the Class IO Certificate,  an amount equal
to (a) the product of (i) the product of (X) a fraction,  the numerator of which
is the number of days  elapsed in the related  Interest  Accrual  Period and the
denominator of which is 360 and (Y) the Class IO Pass-Through  Rate and (ii) the
Class IO Notional  Amount less (b) such Class's  allocable  share (as  described
below)  of any  Mortgage  Certificate  Prepayment  Interest  Shortfall  and  any
Deferred Interest.

     Mortgage  Certificate   Prepayment  Interest  Shortfall  and  any  Deferred
Interest  shall  be  allocated  pro  rata  among  the  Class  A-1 and  Class  IO
Certificates based on the Optimal Interest Amounts for such Classes  (determined
without  reference  to clause (b) of the  definition  of each  Optimal  Interest
Amount).

     Original  Mortgage  Certificate  Principal  Balance:  With  respect to each
Mortgage  Certificate,  the principal balance  indicated  therefor on Schedule I
hereto under "Cut-off Date Principal Balance."

     Original Principal Balance: With respect to:

          (i) the Class A-1 Certificates, $305,580,227;

          (ii) the Class IO Certificate, $0;

          (iii) the Class R Certificates, $0.

     Percentage  Interest:  As to any  Class  A-1  Certificate,  the  percentage
obtained by dividing the Principal  Balance of such  Certificate  on the Closing
Date by the Original Principal Balance of such Class of Certificates.  As to the
Class IO Certificate and the Class R Certificate, 100%.


<PAGE>

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

     Plan: As defined in Section 4.02(c).

     Policy:  The Certificate  Guaranty  Insurance Policy (Policy Number 21252),
including  any  endorsements  thereto,  issued by the  Certificate  Insurer with
respect  to the  Certificates,  substantially  in the form  attached  hereto  as
Exhibit K.

     Pooling and Servicing Agreement:  With respect to any Mortgage Certificate,
the pooling and servicing  agreement  relating to the  assignment of the related
Mortgage  Loans to the related  Mortgage  Loan  Trustee,  the  servicing of such
Mortgage  Loans by the related  Mortgage  Loan  Servicer,  the  issuance of such
Mortgage Certificate and otherwise effecting the establishment of the trust fund
in which such Mortgage Certificate represents an interest.

     Preference Amount: Any amount previously distributed to a Holder on a Class
A-1  Certificate,  which amount  resulted  from a  distribution  on the Mortgage
Certificates that, if not so distributed,  would have been ultimately covered by
the  Certificate  Insurer  pursuant to clause (i) of the  definition of Guaranty
Payment, that is recoverable and sought to be recovered as a voidable preference
by a trustee in  bankruptcy  pursuant to the United States  Bankruptcy  Code (11
U.S.C.),  as amended from time to time, in accordance with a final nonappealable
order of a court having competent jurisdiction.

     Price Maintenance  Agreement:  The price maintenance  agreement in the form
attached  hereto as Exhibit J, dated as of the Closing  Date, by and between the
Trustee, acting on behalf of the Trust Fund, and Norwest Corporation.

     Price   Maintenance   Counterparty:   Norwest   Corporation,   a   Delaware
corporation,  and its successors in interest or any successor Price  Maintenance
Counterparty appointed pursuant to Section 3.09(b).

     Price  Maintenance   Counterparty   Default:   An  "Event  of  Default"  or
"Termination Event" with respect to the Price Maintenance Counterparty,  as such
terms are defined in the Price Maintenance Agreement.

     Price  Maintenance  Payment:  With  respect to any  Distribution  Date with
respect to which an Auction is held, the excess, if any, of (a) the aggregate of
the  Mortgage  Certificate  Principal  Balances  of the Fixed Rate  Certificates
together  with accrued and unpaid  interest  thereon over (b) the sum of (i) the
highest  bid for the Fixed Rate  Certificates  obtained in  accordance  with the
procedures  outlined in Section 3.07 and (ii) the excess of (x) the Reserve Fund
Available Amount over (y) the sum of (1) the excess, if any, of the aggregate of
the Mortgage  Certificate  Principal  Balances of the ARM Certificates  together
with accrued and unpaid interest  thereon over the highest bid price for the ARM

<PAGE>

Certificates obtained in accordance with the procedures outlined in Section 3.07
and (2) the amount  withdrawn from the Reserve Fund pursuant to Section  3.06(c)
with respect to such Distribution Date; provided however, that if a Credit Event
has  occurred  with  respect to any Fixed Rate  Certificate  and the highest bid
received for the Fixed Rate Certificates  (which shall be the sum of the highest
bids obtained for the Fixed Rate  Certificates as to which there has and has not
occurred a Credit Event,  determined  pursuant to Section 3.07 (b)) is less than
the aggregate of the Mortgage  Certificate  Principal Balances of the Fixed Rate
Certificates together with accrued and unpaid interest thereon minus the excess,
if any, of the aggregate of the Mortgage  Certificate  Principal Balances of the
ARM  Certificates  together  with accrued and unpaid  interest  thereon over the
highest  bid price for the ARM  Certificates  obtained  in  accordance  with the
procedures  outlined in Section 3.07, then the Price Maintenance Payment will be
as follows: the excess, if any, of (a) the aggregate of the Mortgage Certificate
Principal  Balances of the Fixed Rate  Certificates  together  with  accrued and
unpaid  interest  thereon  over (b) the sum of (i) the highest bid for the Fixed
Rate  Certificates  as to  which  no  Credit  Event  has  occurred  obtained  in
accordance with the procedures outlined in Section 3.07 (ii) the market value of
a residential mortgage  pass-through  certificate  comparable to each Fixed Rate
Certificate  as to which a Credit Event has occurred,  but for the occurrence of
the Credit Event,  as determined by the  Certificate  Administrator  pursuant to
Section  3.07(b) and (iii) the excess of (x) the Reserve Fund  Available  Amount
over (y) the sum of (1) the excess,  if any, of the  aggregate  of the  Mortgage
Certificate Principal Balances of the ARM Certificates together with accrued and
unpaid  interest  thereon  over the highest  bid price for the ARM  Certificates
obtained in accordance with the procedures  outlined in Section 3.07 and (2) the
amount  withdrawn from the Reserve Fund pursuant to Section 3.06(c) with respect
to such Distribution Date.

     Principal Balance:

     (a) For the Class A-1 Certificates as of any Distribution  Date, the lesser
of  (x)  the  original  Principal  Balance  thereof,   reduced  by  all  amounts
distributed  on such Class on account of principal,  and increased by the amount
of Deferred Interest allocated to such Certificates pursuant to paragraph (b) of
this  definition  on all  Distribution  Dates  and  (y) the  Aggregate  Mortgage
Certificate  Principal  Balance  on  the  Underlying  Series  Distribution  Date
preceding such  Distribution  Date.  The Principal  Balance for the Class IO and
Class R Certificates shall be equal to $0.

     (b) On each  Distribution  Date,  the  Principal  Balance  of the Class A-1
Certificates  (if  calculated  pursuant to clause (x) of  paragraph  (a) of this
definition)  shall be  increased by the amount of Deferred  Interest  applied in
reduction of the Interest  Accrual Amount of the Class A-1  Certificates on such
Distribution Date.

     Prohibited  Transaction:  Has the meaning assigned to it in Section 860F of
the Code.

     Rating Agency:  Moody's and S&P, or their successors in interest. If either
such agency or a successor is no longer in existence,  "Rating  Agency" shall be
such statistical credit rating agency, or other comparable Person, designated by
the  Depositor  (with  the  prior  written  consent  of  MBIA),  notice of which
designation  shall be given to the  Trustee and the  Certificate  Administrator.
References  herein to the highest  short-term rating category of a Rating Agency
shall  mean  P-1 in the case of  Moody's  and A-1+ in the case of S&P and in the
case of any other  Rating  Agency  shall  mean its  equivalent  of such  ratings
without any plus or minus.  References  herein to the highest  long-term  rating
categories  of a Rating  Agency shall mean Aaa in the case of Moody's and AAA in
the  case of S&P and in the  case of any  other  Rating  Agency  shall  mean its
equivalent of such ratings without any plus or minus.


<PAGE>

     Record Date: With respect to each Distribution  Date, the close of business
on the last  Business  Day of the  month  preceding  the  month  in  which  such
Distribution Date occurs.

     Reference Bank: As defined in Section 3.03(a).

     Registrar:  Initially  the  Certificate  Administrator,  in its capacity as
Registrar, or any successor to the Certificate Administrator in such capacity.

     REMIC: A "real estate  mortgage  investment  conduit" as defined in Section
860D of the Code.

     REMIC  Provisions:  Provisions  of the federal  income tax law  relating to
REMICs, which appear at Sections 860A through 860G of Part IV of Subchapter M of
Chapter 1 of Subtitle A of the Code, and related provisions, and U.S. Department
of the Treasury temporary, proposed or final regulations promulgated thereunder,
as the foregoing may be in effect (or with respect to proposed regulations,  are
proposed to be in effect) from time to time.

     REMIC Returns: As defined in Section 5.03.

     Reserve Fund:  The trust account  established  and  maintained  pursuant to
Section 3.06. Funds deposited in the Reserve Fund shall be held in trust for the
benefit of the Class A-1  Certificateholders for the uses and purposes set forth
in Article III hereof.

     Responsible Officer:  With respect to the Certificate  Administrator or the
Trustee,  any officer in the corporate trust  department or any other officer of
the Certificate  Administrator or the Trustee customarily  performing  functions
similar to those  performed  by any of the above  designated  officers and also,
with respect to a particular  matter,  any other  officer to whom such matter is
referred  because  of such  officer's  knowledge  of and  familiarity  with  the
particular subject.

     RTC: The Resolution Trust Corporation, or its successor in interest.

     Securities  Act: The Securities Act of 1933, as amended,  and the rules and
regulations promulgated thereunder.

     Securities  Exchange Act: The Securities  Exchange Act of 1934, as amended,
and the rules and regulations promulgated thereunder.


<PAGE>

     Settlement  Amount:  As defined in the Yield Support Agreement or the Price
Maintenance Agreement, as applicable.

     Similar Law: As defined in Section 4.02(c).

     Single  Certificate:   With  respect  to  the  Class  A-1  Certificates,  a
Certificate with an initial Principal Balance of $1,000. With respect to each of
the  Class  IO  and  Class  R  Certificates,  a  Certificate  evidencing  a 100%
Percentage Interest in such Certificate.

     Tax Beneficial Holder: As defined in Section 3.06(b).

     Trust: The trust created by this Agreement.

     Trust  Fund:  The  corpus  of the  Trust  consisting  of (i)  the  Mortgage
Certificates,  (ii) all distributions on the Mortgage Certificates payable after
the Cut-off Date (other than amounts due on or before the Cut-off  Date),  (iii)
amounts  held  from  time  to  time  by  the  Certificate  Administrator  in the
Certificate Account,  (iv) the Reserve Fund, (v) the rights of the Trustee under
the Yield  Support  Agreement,  (vi) the rights of the  Trustee  under the Price
Maintenance  Agreement and (vii) the rights of the Trustee under the Policy. The
Policy shall not be part of the Trust REMIC.

     Trust REMIC:  The REMIC  consisting  of the items in clauses (i),  (ii) and
(iii) of the  definition  of Trust  Fund and any Price  Maintenance  Payment  or
Guaranty  Payments  made to the Trust  Fund  pursuant  to the Price  Maintenance
Agreement or the Policy, respectively.

     Trustee:  The Chase  Manhattan  Bank  (National  Association),  a  national
banking association, in its capacity as trustee or its successor in interest, or
any successor trustee appointed as herein provided.

     Underlying Series: With respect to any Mortgage Certificate,  the series of
mortgage  pass-through  certificate indicated opposite such Mortgage Certificate
in the table on Schedule I hereto under "Series Designation."

     Underlying Series  Distribution Date: The 25th day of any month,  beginning
in the month of initial  issuance of the  Certificates,  or, if such 25th day is
not a business  day, the business day  following  such 25th day. For purposes of
this  definition  only,  "business  day"  refers to such term as  defined in the
Pooling and Servicing Agreement relating to each Underlying Series.

     Underwriter:  Any party defined as such under the  Underwriting  Agreement,
dated May 28, 1996,  between the Depositor and the CS First Boston  Corporation,
as supplemented by the related terms agreement.


<PAGE>

     Voting Interests:  The portion of the voting rights of all the Certificates
which is allocated to  Certificateholders  in accordance  with their  respective
Percentage Interests. At all times during the term of this Trust Agreement,  98%
of  all  the   Voting   Rights   shall  be   allocated   among   the  Class  A-1
Certificateholders; the Class IO Certificateholders shall be allocated 1% of the
Voting Rights;  and the Class R  Certificateholder  shall be allocated 1% of the
Voting  Rights;  provided,  however,  that for so long as the  Certificates  are
outstanding,  solely for the purposes of giving any consent,  waiver, request or
demand  pursuant to this Trust  Agreement,  the Voting  Rights  evidenced by the
Certificates  registered in the name of the  Certificate  Administrator,  or any
Affiliate  thereof,  shall not be taken into account in determining  whether the
requisite  percentage necessary to effect any such consent,  wavier,  request or
demand shall have been obtained.

     Weighted Average Mortgage  Certificate  Pass-Through  Rate: With respect to
any Underlying  Series  Distribution  Date, the weighted average of the Mortgage
Certificate   Pass-Through  Rates  of  the  Mortgage  Certificates  as  of  such
Underlying  Series  Distribution  Date,  weighted  on the basis of the  Mortgage
Certificate Principal Balances thereof as of such Underlying Series Distribution
Date (before giving effect to distributions on such date).

     Yield Support  Agreement:  The yield support  agreement  attached hereto as
Exhibit I, dated as of the Closing Date,  by and between the Trustee,  acting on
behalf of the Trust Fund, and the Yield Support Counterparty.

     Yield Support  Counterparty:  Norwest Corporation,  a Delaware corporation,
and its  successors  in interest or any  successor  Yield  Support  Counterparty
appointed pursuant to Section 3.08(b).

     Yield Support  Counterparty  Default: An "Event of Default" or "Termination
Event" with respect to the Yield Support Counterparty, as such terms are defined
in the Yield Support Agreement.

     Section 1.02. Interest Calculation; Mortgage Certificate Principal Balance.

     Interest in respect of the Certificates shall be calculated on the basis of
actual days elapsed in a 360-day year.

<PAGE>


                                   ARTICLE II

                       Conveyance of Mortgage Certificates
                       -----------------------------------
                                  and Original
                                  ------------
                            Issuance of Certificates
                            ------------------------

     Section  2.01.  Conveyance  of the Mortgage  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,  (i) all the right,  title and interest of the
Depositor in and to the Mortgage Certificates, all distributions thereon payable
after the Cut-off Date and (ii) cash in the amount of all distributions  made on
the  Mortgage  Certificates  in  May  1996),  together  with  all  other  assets
constituting the Trust Fund.

     The assignment of the Mortgage Certificates accomplished hereby is absolute
and is  intended  as a sale.  The  Depositor  hereby  pledges  and grants to the
Trustee a security  interest  in the  Depositor's  interest in the Trust Fund to
secure payment (in the event of recharacterization  notwithstanding the parties'
intent) and  performance  by the  Depositor of its  obligations  hereunder.  The
Depositor and the Trustee shall,  to the extent  consistent with this Agreement,
take such actions as may be necessary to ensure  that,  if this  Agreement  were
deemed to create a security interest in the Mortgage Certificates, such security
interest would be deemed to be a perfected  security  interest of first priority
under applicable law and shall be maintained as such throughout the term of this
Agreement.

     Section 2.02. Issuance of the Certificates.  The Trustee  acknowledges that
the Mortgage Certificates have been delivered to it by the Depositor through the
facilities of the Depository Trust Company, and the Trustee acknowledges that it
has possession thereof, and,  concurrently with such delivery,  has caused to be
duly  executed,  authenticated  and  delivered  to or  upon  the  order  of  the
Depositor,  in exchange for the Mortgage  Certificates  together  with all other
assets  included in the  definition of "Trust Fund,"  receipt of which is hereby
acknowledged,  the  Certificates  in  authorized  denominations  which  evidence
ownership of the entire Trust.

     Section  2.03.   Representations  and  Warranties  of  the  Depositor.  The
Depositor  represents  and  warrants  to  and  covenants  with  the  Certificate
Administrator and the Trustee for the benefit of the Certificate Insurer and the
Certificateholders as follows:

     (a) The  Depositor  has been duly  organized  and is validly  existing as a
corporation  in good standing  under the laws of the State of Delaware with full
power and  authority  to own its  properties  and  conduct its  business  and to
perform its obligations under this Trust Agreement.


<PAGE>

     (b) This Trust Agreement has been duly  authorized,  executed and delivered
by the Depositor,  and,  assuming the valid execution thereof by the Certificate
Administrator,  the Tax Beneficial Holder and the Trustee,  this Trust Agreement
shall constitute a valid and binding  agreement of the Depositor  enforceable in
accordance  with its terms,  except as the same may be  limited  by  bankruptcy,
insolvency,   reorganization   or  other  laws  relating  to  or  affecting  the
enforcement of creditors' rights and by general equity principles.

     (c)  Neither  the  issuance  or  delivery  of  the  Certificates,  nor  the
consummation  of  any  other  of  the  transactions   contemplated  herein,  nor
compliance with the provisions of this Trust  Agreement,  shall conflict with or
result in the breach of any material term or provision of the trust agreement of
the Depositor,  and the Depositor is not in breach or violation of or in default
(nor, to the best of the Depositor's knowledge, has an event occurred which with
notice or lapse of time or both would  constitute a default)  under the terms of
(i) any  agreement  to  which  the  Depositor  is a party  or by which it or its
properties  are  bound,  or (ii)  any law,  decree,  order,  rule or  regulation
applicable   to  the  Depositor  of  any  court  or   supervisory,   regulatory,
administrative or governmental  agency, body or authority,  or arbitrator having
jurisdiction  over its properties,  the default in or the breach or violation of
which would have a material  adverse  effect on the  Depositor or the ability of
the Depositor to perform its obligations under this Trust Agreement.

     (d) No filing or  registration  with,  notice  to,  or  consent,  approval,
authorization or order or other action of any court or governmental authority or
agency is required for the  consummation  by the  Depositor of the  transactions
contemplated by this Trust Agreement, except such as have been obtained.

     (e) Upon execution and delivery by the Certificate  Administrator,  the Tax
Beneficial  Holder and the Trustee of this Trust  Agreement  and delivery to the
Depositor of the Certificates, the Trust shall acquire the Mortgage Certificates
free of any lien, mortgage, pledge, charge, encumbrance,  adverse claim or other
security interest.

     It is understood  and agreed that the  representations  and  warranties set
forth in this Section 2.03 shall survive  delivery of the Mortgage  Certificates
to the Trustee. Upon discovery by the Depositor, the Certificate  Administrator,
the Tax  Beneficial  Holder or the  Trustee of a breach of any of the  foregoing
representations and warranties (referred to herein as a "breach"),  which breach
materially and adversely affects the interests of the  Certificateholders or the
Certificate  Insurer in the Mortgage  Certificates,  the party  discovering such
breach shall give prompt written notice to the other party.

     Within 90 days of its  discovery  or its  receipt of notice of breach,  the
Depositor  shall cure such breach in all material  respects or shall  repurchase
each  Mortgage  Certificate  to which such breach  relates from the Trustee at a
price equal to the sum of (i) the Mortgage Certificate Principal Balance thereof
as of the next Underlying Series Distribution Date and (ii) one month's interest
on such  Mortgage  Certificate  Principal  Balance at the  Mortgage  Certificate
Pass-Through Rate. The purchase price for the repurchased Mortgage  Certificates
shall be deposited by the Certificate  Administrator in the Certificate Account.
It is understood  and agreed that the  obligation of the Depositor to repurchase
the Mortgage  Certificates  shall  constitute  the sole remedy  respecting  such
breach   available   to   Certificateholders   or  the   Trustee  on  behalf  of
Certificateholders.


<PAGE>

     Section 2.04. REMIC Designations and Related Matters.

     (a) The Depositor hereby designates the Class A-1 and Class IO Certificates
as the  "regular  interests"  and  the  Class  R  Certificate  as the  "residual
interest"  in the Trust  REMIC  within the meaning of  Sections  860G(a)(1)  and
860G(a)(2) of the Code, respectively.

     (b) The Closing Date is hereby designated as the "startup day" of the Trust
REMIC (the "Startup Day") within the meaning of Section 860G(a)(9) of the Code.

     (c) If a "tax matters  person" is required to be designated with respect to
the Trust REMIC,  the holder of the Class R  Certificate,  by acceptance of such
Certificate,  shall be deemed  to agree to act as "tax  matters  person"  and to
perform the  functions of "tax matters  partner" for purposes of Subchapter C of
Chapter  63 of  Subtitle  F of the Code,  and  shall be  deemed  to  irrevocably
designate the Certificate Administrator as its agent in performing the functions
of "tax matters person" and "tax matters partner."

     (d) The "latest  possible  maturity  date" of the regular  interests in the
Trust  REMIC is the  Distribution  Date  occurring  on  September  28,  2029 for
purposes of Code Section 860G(a)(1).

     (e) All provisions of this Agreement shall be construed so as to effectuate
the intent of the  parties  hereto that the Trust REMIC be treated as a REMIC at
all times and neither the Trust REMIC nor any party  hereto  shall enter into or
directly or indirectly cause a Prohibited Transaction to occur so long as any of
the  Certificates are outstanding or cause the Trust REMIC to fail to qualify as
a REMIC during any taxable year.

<PAGE>


                                   ARTICLE III

                           Administration of the Trust
                           ---------------------------

     Section 3.01. Collection of Payments on Mortgage Certificates;  Certificate
Account.

     (a) The Certificate  Administrator shall establish and maintain with itself
a  trust  account  (the  "Certificate   Account")   entitled   "Adjustable  Rate
Certificates  Series 1996-1,  Certificate  Account,"  which shall be an Eligible
Account.  The Trustee shall remit to the Certificate Account all payments on the
Mortgage  Certificates,  on the Business Day succeeding its receipt thereof (but
in no event  later than the  related  Distribution  Date),  by wire  transfer of
immediately   available  funds.  On  each  Distribution  Date,  the  Certificate
Administrator  shall withdraw from the Guaranty Payment Account and remit to the
Certificate  Account all Guaranty  Payments received with respect to each of the
Underlying Series  Distribution Dates occurring in the related Collection Period
(together with any amounts deposited by the Certificate  Insurer in the Guaranty
Payment  Amount  in  respect  of  losses  on funds  invested  therein).  On each
Distribution  Date, before making the distributions  referred to in Section 3.02
below,  the  Certificate  Administrator  shall  withdraw the amount of any taxes
payable  with  respect to the Trust REMIC  pursuant to Section  5.05(a) from the
Certificate Account. If the Certificate  Administrator shall not have received a
distribution  with respect to the Mortgage  Certificates  by the second Business
Day after the date on which such  distribution  was due and payable  pursuant to
the terms of the Mortgage  Certificates,  the  Certificate  Administrator  shall
request such payment as promptly as possible and legally  permitted  and if such
payment  is not made  after such  request  shall,  subject to the second to last
sentence of this  paragraph,  take such  action as  directed by the  Certificate
Insurer,  including the prosecution of any claims in connection  therewith.  The
reasonable legal fees and expenses incurred by the Certificate  Administrator in
connection  with the  prosecution of any such legal action shall be reimbursable
to the  Certificate  Administrator  out of the  proceeds  of any such action and
shall be retained by the Certificate  Administrator  prior to the deposit of any
remaining proceeds in the Certificate  Account pending  distribution  thereof to
Certificateholders in accordance with Section 3.02 hereof. In the event that the
Certificate  Administrator  has reason to believe  that the proceeds of any such
legal action may be  insufficient  to reimburse it for its projected  legal fees
and expenses, the Certificate Administrator shall notify the Certificate Insurer
that it is not obligated to pursue any such available  remedies  unless adequate
indemnity  for its  legal  fees and  expenses  is  provided  by the  Certificate
Insurer.  In the  event  any  such  indemnity  is  provided  to the  Certificate
Administrator,  the Certificate Administrator shall take such action as directed
by the Certificate Insurer.

     (b) All or a portion  of amounts  on  deposit  in the  Certificate  Account
(other than  amounts  deposited  on a  Distribution  Date) shall be invested and
reinvested by the Certificate Administrator in one or more Eligible Investments.
Notwithstanding  the  foregoing,  no  investment of any amount on deposit in the
Certificate Account may mature later than the immediately following Distribution
Date and no such investment shall be sold prior to its maturity date.


<PAGE>

     (c) The Certificate  Administrator shall remit to the Certificate  Insurer,
within one Business Day of receipt  thereof,  any amount remitted by the Trustee
to the  Certificate  Account  pursuant to Section  3.01(a) that is  specifically
identified as a payment of "Unpaid Interest  Shortfall" (as such term is defined
in the Pooling and Servicing Agreement with respect to any Mortgage Certificate)
or other form of overdue interest on the Mortgage Certificate  Distribution Date
Statement  related to any  Mortgage  Certificate  and any  portion of a Clean-Up
Payment  which  represents  overdue  interest,  in either case,  as to which the
Certificate Insurer has made an unreimbursed Guaranty Payment.

     (d) In the event that the auction to be held  pursuant to Section 3.07 does
not result in the sale of the Mortgage  Certificates  and the  retirement of the
Class A-1 Certificates on the  Distribution  Date related to the Initial Auction
Date, the Certificate  Administrator  shall establish and maintain with itself a
trust  account (the  "Extension  Premium  Account")  entitled  "Adjustable  Rate
Certificates  Series  1996-1,  Extension  Premium  Account,"  which  shall be an
Eligible  Account.  All or a portion of  amounts  on  deposit  in the  Extension
Premium Account (other than amounts  deposited on a Distribution  Date) shall be
invested and reinvested by the Certificate Administrator at the direction of the
Certificate Insurer.  Notwithstanding the foregoing, no investment of any amount
on deposit in the  Certificate  Account may mature  later than the  Business Day
immediately preceding the immediately following Distribution Date. Any income or
loss  on  the  Extension  Premium  Account  shall  be  for  the  account  of the
Certificate Insurer.

     In the event that the auction to be held  pursuant to Section 3.07 does not
result in the sale of the Mortgage  Certificates and the retirement of the Class
A-1 Certificates on the  Distribution  Date related to the Initial Auction Date,
with respect to each Underlying  Series  Distribution Date following the Initial
Auction  Date  until the  Distribution  Date on which  the sale of the  Mortgage
Certificates  and the  retirement  of the Class  A-1  Certificates  occurs,  the
Certificate  Administrator shall withdraw from the Certificate Account an amount
equal to the product of 1/12th of 0.10% and the Aggregate  Mortgage  Certificate
Principal Balance on such Underlying  Series  Distribution Date (prior to giving
effect to  distributions  in reduction of each  Mortgage  Certificate  Principal
Balance on such Underlying  Series  Distribution  Date) (the sum of such amounts
for each  Collection  Period,  the  "Extension  Premium") and shall deposit such
amount into the Extension  Premium Account.  On each Distribution Date following
the Initial Auction Date up to and including the Distribution  Date on which the
sale  of  the  Mortgage  Certificates  and  the  retirement  of  the  Class  A-1
Certificates occurs, the Certificate  Administrator shall remit by wire transfer
to the  Certificate  Insurer  all  amounts on deposit in the  Extension  Premium
Account.

     (e) The Trustee hereby  designates  the  Certificate  Administrator  as its
agent to deliver Notices of Claim with respect to the Policy (in accordance with
Section 3.10 hereof) and to receive all Guaranty Payments under the Policy.  The
Certificate  Administrator  shall  establish  and  maintain  with itself a trust
account (the "Guaranty Payment Account") entitled  "Adjustable Rate Certificates
Series 1996-1,  Guaranty Payment  Account," which shall be an Eligible  Account.
The Certificate  Administrator shall deposit in the Guaranty Payment Account all
Guaranty Payments received by it under the Policy  immediately as received.  All
or a portion of amounts on deposit  in the  Guaranty  Payment  Account  shall be
invested and reinvested by the Certificate Administrator in Eligible Investments
at the  direction of the  Certificate  Insurer.  No  investment of any amount on
deposit in the  Certificate  Account  may mature  later  than the  Business  Day
immediately preceding the immediately following Distribution Date. Any income or
loss on the Guaranty Payment Account shall be for the account of the Certificate
Insurer. The Certificate Insurer shall be required,  pursuant to Section 3.06 of
the Insurance  Agreement,  to deposit in the Guaranty Payment Account the amount
of any loss on an investment of funds therein  immediately  upon the realization
of any such loss. On each Distribution Date, the Certificate Administrator shall
remit to the Certificate  Insurer by wire transfer the amount,  if any, by which
the  balance on deposit  in the  Guaranty  Payment  Account  exceeds  the amount
remitted  therefrom  to the  Certificate  Account  pursuant  to Section  3.01(a)
hereof.


<PAGE>

     (f) On any  Distribution  Date as to which a  Guaranty  Payment  is payable
under the Policy on the  Underlying  Series  Distribution  Date occurring in the
month in which such  Distribution  Date occurs,  in the event that MBIA does not
receive a Notice of Claim from the  Certificate  Administrator  by 12:00 noon on
the  Business Day  preceding  such  Distribution  Date with the result that MBIA
makes such Guaranty Payment after 12:00 noon on such Distribution Date (any such
delayed Guaranty Payment,  a "Delayed Guaranty Payment") (which may occur if the
Underlying Series  Distribution Date in such month occurs on the same day as the
Distribution  Date),  such  Distribution  Date shall be delayed one Business Day
(any such  delayed  Distribution  Date,  a "Delayed  Distribution  Date") if the
amount on  deposit  in the  Reserve  Fund,  net of any  amount  to be  withdrawn
therefrom in  accordance  with Section  3.06(c)  (assuming for such purpose that
such Guaranty Payment was available to be distributed on such Distribution Date)
(such net amount, the "Net Reserve Fund Available Amount"), is at least equal to
the amount of the Delayed  Guaranty  Payment.  In the event that the Net Reserve
Fund Available  Amount is at least equal to the amount of such Delayed  Guaranty
Payment, the Certificate Administrator shall withdraw the amount of such Delayed
Guaranty  Payment from the Reserve Fund and make full  distributions of interest
and  principal in  accordance  with Section  3.02(b) on such  Distribution  Date
without delay.  The  Certificate  Administrator  shall then deposit such Delayed
Guaranty Payment in the Reserve Fund when received. In the event that there is a
Delayed  Guaranty  Payment with respect to the  Distribution  Date following the
date on which the Trustee agrees to sell the Mortgage  Certificates  pursuant to
Section  3.07,  such  Distribution  Date  shall  be  delayed  one  Business  Day
regardless of the availability of funds in the Reserve Fund.

     Section 3.02. Distributions.

     (a) The Certificate  Administrator shall, based on the Mortgage Certificate
Distribution  Date  Statements,  calculate the amounts to be distributed on each
Class of Certificates pursuant to subsection (b) of this Section 3.02.

     (b)(i)  Except as set forth below in Section  3.02(c)  with  respect to the
Distribution  Date  following  the date on which the Trustee  agrees to sell the
Mortgage  Certificates  pursuant to Section 3.07, on each Distribution Date, the
Certificate Administrator (based on the calculations made pursuant to subsection
(a) of this  Section  3.02) shall  distribute  the Interest  Available  Funds on
deposit in the  Certificate  Account,  in the  following  order of priority (the
"Interest Available Funds Allocation"):


<PAGE>

     first,  to the Class A-1  Certificates,  in an amount equal to such Class's
Interest Accrual Amount up to an amount equal to the Interest Available Funds;

     second,  to the Class A-1  Certificates,  in an aggregate amount up to such
Class's  previously  unpaid Interest  Shortfall Amounts up to an amount equal to
the  excess,  if any, of Interest  Available  Funds over the amount  distributed
pursuant to clause first hereof;

     third,  to the  Class IO  Certificate,  in an  aggregate  amount up to such
Class's Interest Accrual Amount with respect to such Distribution Date up to the
amount equal to the excess, if any, of Interest  Available Funds over the amount
distributed pursuant to clauses first and second hereof;

     fourth,  to the Class IO  Certificate,  in an  aggregate  amount up to such
Class's  previously  unpaid Interest  Shortfall Amounts up to an amount equal to
the  excess,  if any, of Interest  Available  Funds over the amount  distributed
pursuant to clauses first through third hereof; and

     fifth, to the Class R Certificate,  up to an amount equal to the excess, if
any, of Interest Available Funds over the amount distributed pursuant to clauses
first through fourth hereof.

     (ii) On each Distribution Date, the Certificate Administrator (based on the
calculations  made pursuant to  subsection  (a) of this Section 3.02) shall make
distributions,  to the  extent  of  all  amounts  received  during  the  related
Collection  Period  on  account  of  principal  with  respect  to  the  Mortgage
Certificates and the principal portion of any Clean-Up Payment,  concurrently to
the Class A-1  Certificateholders  in reduction of the Principal Balance thereof
and to the Class IO Certificate  in reduction of the Class IO Deferred  Interest
Carryforward  Amount, pro rata in accordance with such amounts,  until the Class
A-1 Principal  Balance and the Class IO Deferred  Interest  Carryforward  Amount
have each been reduced to zero.

     (iii) On each Distribution Date, the Certificate  Administrator  shall make
distributions,  to the extent of the principal  portion of all Guaranty Payments
received during the related  Collection  Period, to the holders of the Class A-1
Certificates  in reduction of the Principal  Balance thereof until the Class A-1
Principal Balance has been reduced to zero.

     (iv)  In  addition  to  the  distributions   described  above  in  Sections
3.02(b)(i),   (ii)  and  (iii),  on  each   Distribution  Date  the  Certificate
Administrator  shall distribute to the holders of the Class A-1 Certificates any
Guaranty  Payments in respect of  Preference  Amounts  received by it during the
related Collection Period.

     (c) On the Distribution Date following the date on which the Trustee agrees
to  sell  the  Mortgage   Certificates  pursuant  to  Section  3.07,  the  Final
Distribution Amount shall be distributed as follows:


<PAGE>

          first,  to the Class  A-1  Certificates,  in an  amount  equal to such
Class's Interest Accrual Amount;

          second, to the Class A-1 Certificates in an aggregate amount up to the
Final Interest Shortfall Distribution Amount;

          third,  to the  Class  A-1  Certificates  in an  amount  equal  to the
outstanding Principal Balance thereof; and

          fourth,  to the  Class  R  Certificate  the  remainder  of  the  Final
Distribution Amount.

     (d) The Certificate  Administrator shall make the above distributions up to
the amounts set forth below to the Certificateholders of record on the preceding
Record  Date  as   specified   below,   by  check   mailed  to  the   applicable
Certificateholder  at such  Holder's  address as it  appears on the  Certificate
Register, or, if such  Certificateholder  holds Certificates of any Class having
an initial  Principal  Balance of at least  $5,000,000,  by wire  transfer to an
account  specified  in writing by such  Certificateholder  prior to the  related
Record Date.  Distributions  to each holder of a Certificate of a Class shall be
made to the extent described above, on each Distribution Date in an amount equal
to each  such  Holder's  Percentage  Interest  multiplied  by the  amount  to be
distributed in respect of such Class of Certificates.

     (e) The  Certificate  Administrator  shall withhold or cause to be withheld
such  amounts  as may be  required  by  the  Code  (giving  full  effect  to any
exemptions from withholding and related certifications  required to be furnished
by  Certificateholders  and any  reductions  to  withholding  by  virtue  of any
bilateral tax treaties and any applicable certification required to be furnished
by  Certificateholders  with respect  thereto) from  distributions to be made to
Non-U.S.  Persons.  Amounts  withheld  pursuant to this Section 3.02(e) shall be
treated as having been  distributed  to the related  Certificateholders  for all
purposes  of  this  Agreement.  For the  purposes  of this  Section  3.02(e),  a
"Non-U.S.  Person" is an  individual,  corporation,  partnership or other person
other  than  a  citizen  or  resident  of  the  United  States,  a  corporation,
partnership  or other  entity  created or  organized in or under the laws of the
United States or any political  subdivision  thereof, or an estate or trust that
is subject to U.S. federal income tax regardless of the source of its income.

     Section 3.03.  Determination  Of LIBOR.  (a) On each LIBOR Reset Date,  the
Certificate  Administrator  shall  determine  LIBOR for the succeeding  Interest
Accrual  Period on the basis of the offered  LIBOR  quotations  of the Reference
Banks, as such quotations are provided to the  Certificate  Administrator  as of
11:00 a.m. (London time) on such LIBOR Reset Date. The Certificate Administrator
shall  request the principal  London  office of each of the  Reference  Banks to
provide a quotation of its LIBOR.  If at least two such quotations are provided,
LIBOR for the succeeding Interest Accrual Period shall be the arithmetic mean of
such offered  quotations  (rounding such arithmetic mean upwards if necessary to
the nearest  whole  multiple of 1/16%).  If fewer than two such  quotations  are
provided as requested, LIBOR for the succeeding Interest Accrual Period shall be
the higher of (x) LIBOR as  determined  on the previous  LIBOR Reset Date or (y)
the Reserve  Interest  Rate.  The "Reserve  Interest Rate" shall be the rate per
annum  which the  Certificate  Administrator  determines  to be  either  (A) the
arithmetic  mean  (rounding  such  arithmetic  mean  upwards if necessary to the
nearest whole multiple of 1/16%) of the one-month  Eurodollar  lending rate that
New York City banks selected by the Certificate  Administrator  are quoting,  on
the relevant  LIBOR Reset Date, to the principal  London offices of at least two
leading  banks in the  London  interbank  market  or (B) in the  event  that the
Certificate  Administrator  can determine no such  arithmetic  mean,  the lowest
one-month  Eurodollar  lending rate that the New York City banks selected by the
Certificate  Administrator  are  quoting  on such  LIBOR  Reset  Date to leading
European banks.


<PAGE>

     As used in this section  "Reference Banks" means four leading banks engaged
in transactions in Eurodollar deposits in the international  Eurocurrency market
(i) with an  established  place of  business  in London,  (ii) whose  quotations
appear on the Reuters  Screen LIBO Page on the LIBOR Reset Date in question  and
(iii) which have been  designated as such by the Certificate  Administrator  and
are able and willing to provide such quotations to the Certificate Administrator
on each LIBOR  Reset  Date;  and  "Reuters  Screen  LIBO Page" means the display
designated  as page "LIBO" on the Reuters  Monitor  Money Rates Service (or such
other  page as may  replace  the LIBO page on that  service  for the  purpose of
displaying  London  interbank  offered rate quotations for major banks).  If any
Reference  Bank should be removed  from the  Reuters  Screen LIBO Page or in any
other way fails to meet the  qualifications of a Reference Bank, the Certificate
Administrator  may, in its sole discretion,  designate an alternative  Reference
Bank.

     (b) If on any LIBOR Reset Date, the Certificate  Administrator  is required
but is unable to determine the Reserve  Interest Rate in the manner  provided in
paragraph (a) above,  LIBOR for the succeeding  Interest Accrual Period shall be
LIBOR as determined on the previous LIBOR Reset Date.

     (c) The  determination  of LIBOR by the Certificate  Administrator  for the
relevant  Interest  Accrual  Period (in the absence of manifest  error) shall be
final and binding.

     Section 3.04. Statements to Certificateholders.

     (a) On each Distribution Date (except as set forth in the proviso set forth
below),  the  Certificate  Administrator  shall  prepare,  based on the Mortgage
Certificate  Distribution Date Statements,  and forward or cause to be forwarded
by mail a statement  to each  Certificateholder,  the Trustee,  the  Certificate
Insurer and each Rating Agency stating:

          (1)  the amount of any Principal  Distribution  Amount  distributed on
               such  Distribution  Date  on  a  Class  A-1  Certificate  with  a
               denomination of $1,000;

          (2)  the Interest Accrual Amount (separately  stating any reduction in
               the  amount  thereof  in  respect  of  any  Mortgage  Certificate
               Prepayment   Interest   Shortfall  and  any  Deferred   Interest)
               distributable on such  Distribution  Date on a Certificate with a
               denomination of $1,000 of the same Class as the Certificate  held
               by  the  Certificateholder   receiving  such  statement  and  the
               Interest  Shortfall Amount, if any,  allocated to such Class with
               respect  to such  Distribution  Date,  together  with the  unpaid
               Interest  Shortfall  Amount  for  such  Class  after  making  all
               distributions on such Distribution Date;


<PAGE>

          (3)  the Class A-1 Pass-Through  Rate, the Class IO Pass-Through  Rate
               and the Effective Quarterly Weighted Average Mortgage Certificate
               Pass-Through Rate applicable to such Distribution Date;

          (4)  the amount of any Guaranty  Payment  (separately  identifying the
               principal,  interest and Preference Amount portions thereof) paid
               by the Certificate Insurer with respect to each Underlying Series
               Distribution  Date occurring during the Collection Period related
               to such Distribution Date;

          (5)  the amount of any Yield Support Payment paid by the Yield Support
               Counterparty with respect to such Distribution Date;

          (6)  the amount on deposit in the Reserve Fund as of such Distribution
               Date  after   giving   effect  to  any   distributions   on  such
               Distribution Date;

          (7)  the outstanding  Principal  Balance of the Class A-1 Certificates
               after  giving  effect to the  distributions  of principal on such
               Class and Principal  Balance  reductions due to any allocation of
               losses  to  the  Mortgage  Certificates  as  of  the  immediately
               preceding  Distribution  Date and Principal Balance increases due
               to the  allocation  of  Deferred  Interest  to such Class on such
               Distribution Date;

          (8)  the Class IO Notional Amount;

          (9)  the Aggregate Mortgage  Certificate  Principal Balance as of such
               Distribution Date;

          (10) the amounts  distributed  in respect of interest and principal on
               each  Mortgage  Certificate  on  the  related  Underlying  Series
               Distribution Date and the amount of losses, if any,  allocable to
               such  Mortgage  Certificate  on  the  related  Underlying  Series
               Distribution Date;


<PAGE>

          (11) to the  extent  such  information  is  included  in the  Mortgage
               Certificate  Distribution Date Statement, the aggregate principal
               balance of the Mortgage Loans in the trust fund  underlying  each
               Mortgage  Certificate,  and in the specific  mortgage pool within
               such trust fund which underlies each Mortgage  Certificate,  that
               are 30 days, 60 days or 90 days or more delinquent, the aggregate
               principal balance of such Mortgage Loans that are in foreclosure,
               the aggregate principal balance of such Mortgage Loans that as to
               which the related mortgaged  properties have been acquired by the
               related trust fund, and by the specific mortgage pool within such
               trust  fund  which  underlies  each  Mortgage   Certificate,   by
               foreclosure  or  deed-in-lieu  of  foreclosure  and the aggregate
               realized  losses incurred by Mortgage Loans in each related trust
               fund,  and in the specific  mortgage  pool within such trust fund
               which  underlies  each  Mortgage  Certificate,  since the Cut-off
               Date;

          (12) such other customary information as the Certificate Administrator
               deems  necessary  or desirable  to enable  Certificateholders  to
               prepare their tax returns; and

          (13) describing  any Credit  Event that occurs with respect to a Fixed
               Rate Certificate;

provided, however, that with respect to the information required by subparagraph
(11) above, the Certificate  Administrator shall report such information on each
Distribution  Date and, in the event that it is unable to do so,  shall  prepare
and forward, or cause to be forwarded by mail, as soon as reasonably practicable
thereafter,  a separate statement to each  Certificateholder,  the Trustee,  the
Certificate Insurer and each Rating Agency containing such information.

     (b) Within a reasonable period of time after the end of each calendar year,
the  Certificate  Administrator  shall  furnish or cause to be furnished to each
Person who at any time during the calendar  year was the Holder of a Certificate
a  statement  containing  (i) the  information  set forth in clauses (1) and (2)
above  aggregated  for such calendar year or applicable  portion  thereof during
which such Person was a Certificateholder, (ii) information concerning interest,
original issue discount,  adjusted issue price, and information  relating to the
computation of market discount with respect to the Mortgage  Certificates as and
to the  extent  received  from the  trustee of each  Underlying  Series for such
calendar   year  or   portion   thereof   during   which   such   Person  was  a
Certificateholder  and (iii)  information  as to the percentage of each Mortgage
Certificate  qualifying  for the  status  under  each of Code  Sections  593(d),
856(c)(5)(A)  and  7701(a)(19)(C)  and of the income thereon  qualifying for the
status under Code Section  856(c)(3)(B).  Such  obligations  of the  Certificate
Administrator  shall  be  deemed  to have  been  satisfied  to the  extent  that
substantially  comparable  information  shall  be  provided  by the  Certificate
Administrator pursuant to any requirements of the Code.


<PAGE>

     Section  3.05.  Notices  to  Trustee.  (a) Upon  receipt  of any  notice or
statement with respect to the Mortgage Certificates,  the Trustee shall promptly
transmit  such  notice  to the  Certificate  Administrator  and the  Certificate
Administrator shall forward such notice or statement to the Certificate Insurer.
Subject to the third  paragraph of Section 9.02, if at any time the Trustee,  as
the Holder of the Mortgage  Certificates,  is requested in such capacity to take
any  action  or to give any  consent,  approval  or  waiver,  including  without
limitation  in  connection  with  an  amendment  of the  Pooling  and  Servicing
Agreement  or if an event of default  occurs  under the  Pooling  and  Servicing
Agreement with respect to the servicer or the Mortgage Loan Trustee  thereunder,
the  Trustee,  in its  capacity as Holder of the  Mortgage  Certificates,  shall
promptly  notify or cause to be notified all of the Holders of the  Certificates
and the  Certificate  Insurer  and  shall  take  action in  connection  with the
enforcement  of any rights and remedies  available to it in such  capacity  with
respect thereto only in accordance with the written directions of Holders of the
Certificates representing an aggregate outstanding Principal Balance of not less
than 51% of each Class of Certificates.

     (b) Upon  receipt  of  notice  of the final  distribution  on any  Mortgage
Certificate,  the Trustee  shall  surrender  such  Mortgage  Certificate  to the
Mortgage Loan Trustee for payment of the final distribution thereon.

     Section  3.06.  Reserve  Fund.  (a)  The  Certificate  Administrator  shall
establish  and maintain  with itself a segregated  trust  account (the  "Reserve
Fund")  entitled  "Adjustable  Rate  Certificates,  Series 1996-1 Reserve Fund,"
which it shall hold for the benefit of the Trustee,  on behalf of the Holders of
the  Certificates.  On the Closing Date,  the Depositor,  concurrently  with the
execution and delivery hereof, does hereby transfer,  convey, sell and assign to
the Certificate  Administrator,  on behalf of the Trustee for the benefit of the
Holders of the Certificates, without recourse, all the right, title and interest
of the Depositor in and to the Reserve Fund, to include the Class IO and Class R
Certificates. All distributions on the Class IO and Class R Certificates and any
Yield  Support  Payments  shall  be made to the  Certificate  Administrator  for
deposit  into the Reserve  Fund.  Funds on deposit in the Reserve  Fund shall be
invested  in  Eligible  Investments  in the same  manner and subject to the same
requirements  and  limitations  as the  investment  of funds in the  Certificate
Account pursuant to Section 3.01 of this Trust Agreement.

     The assignment of the Reserve Fund  accomplished  hereby is absolute and is
intended as a sale. The Depositor  hereby pledges and grants to the  Certificate
Administrator  a security  interest in the  Depositor's  interest in the Reserve
Fund to secure payment (in the event of  recharacterization  notwithstanding the
parties' intent) and performance by the Depositor of its obligations  hereunder.
The Depositor,  the  Certificate  Administrator  and the Trustee  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
Reserve Fund, such security interest would be deemed to be a perfected  security
interest of first priority under  applicable law and shall be maintained as such
throughout the term of this Agreement.


<PAGE>

     (b) The Reserve  Fund shall be an asset of the Trust Fund,  and it shall be
an "outside reserve fund" as that term is used in Reg. section 1.860G-2(h) under
the Code, but it shall not be an asset of the Trust REMIC.  Norwest  Corporation
is hereby  designated as the sole beneficial owner of the Reserve Fund (the "Tax
Beneficial  Holder"),  and for federal tax purposes,  all amounts transferred by
the Trust REMIC to the Reserve Fund shall be deemed to be amounts distributed by
the Trust REMIC to the Tax Beneficial Holder or its designated transferees.  The
Tax Beneficial  Holder shall not transfer its interests  under, and its right to
receive  amounts   distributed  to,  the  Reserve  Fund,  unless  a  prospective
transferee has delivered (i) a certificate  substantially in the form of Exhibit
E or Exhibit F hereto and (ii) an affidavit substantially in the form of Exhibit
G hereto in accordance with Section 4.02(d) to the Certificate Administrator. At
any given time, there shall be only one Tax Beneficial Holder.

     (c) If on any  Distribution  Date,  the excess of the amounts  described in
clauses (X)(a),  (b) and (c) of the definition of Interest  Available Funds over
the amount described in clause (Y) of the definition  thereof is insufficient to
make the  distributions  required by Section  3.02(b)(i)  first and second,  the
Certificate  Administrator  shall  withdraw from the Reserve Fund and deposit in
the Certificate  Account the lesser of (i) the Available Reserve Fund Amount and
(ii) the amount necessary to make up such deficiency.  On any Distribution  Date
following  an  Initial  Auction  Date or an Auction  Date on which the  Mortgage
Certificates   have  been  sold  pursuant  to  Section  3.07,  the   Certificate
Administrator shall withdraw from the Reserve Fund an amount equal to the amount
set forth in clause  (iv) of the  definition  of Final  Distribution  Amount and
deposit it in the Certificate Account.

     (d) On each Distribution  Date, all distributions  made pursuant to Section
3.02(b)(i) third,  fourth and fifth and all distributions made in respect of the
Class IO Certificate pursuant to Section 3.02(b)(ii) shall be deposited into the
Reserve Fund in respect of the Class IO and Class R Certificates.

     (e) Upon the termination of this Trust Agreement,  amounts remaining in the
Reserve Fund shall be distributed to the Tax Beneficial Holder, and such amounts
shall not be subject to any claims or rights of the Certificateholders.

     Section 3.07.  Mandatory  Auction.  (a) If, following  distributions on the
Class A-1  Certificates on the  Distribution  Date preceding the Initial Auction
Date or any  Auction  Date,  the  Interest  Shortfall  Amount  of the  Class A-1
Certificates is greater than zero, the Certificate  Administrator  shall solicit
the vote of all holders of the Class A-1 Certificates  (utilizing the procedures
established  by the  Clearing  Agency for any such  solicitation)  to  determine
whether the majority of such holders shall direct that the Class A-1  Retirement
Amount shall be  determined  pursuant to the second  sentence of the  definition
thereof.  If holders  representing  51% of the Voting Interests of all Class A-1
Certificates  so direct,  the Class A-1  Retirement  Amount  for the  succeeding
Auction  Date  shall  be  determined  pursuant  to the  second  sentence  of the
definition thereof.


<PAGE>

     (b) On the  Initial  Auction  Date and each  subsequent  Auction  Date,  if
necessary,  the  Certificate  Administrator  shall,  on behalf  of the  Trustee,
solicit  bids  from  at  least  three  recognized  broker/dealers  that  deal in
securities similar to the Mortgage Certificates,  and from such other parties as
the Certificate  Administrator deems appropriate,  for the purchase of the Fixed
Rate  Certificates and for the purchase of the ARM  Certificates.  Bids shall be
solicited for all the Fixed Rate  Certificates  and for all the ARM Certificates
("All or Nothing Bids") as well as for one or more of the Mortgage  Certificates
on an individual basis ("Line Item Bids"; together with the All or Nothing Bids,
the "Bids"). In the event that (i) two or more identical All or Nothing Bids are
received or (ii) two or more  identical Line Item Bids are received for the same
Mortgage  Certificates  within 15 days of the Initial  Auction  Date, or Auction
Date, as applicable,  the Certificate  Administrator shall solicit new Bids from
all  participating  bidders  for an  additional  10 days  until  only one All or
Nothing Bid for each of the Fixed Rate and the ARM Certificates  and/or only one
Line Item Bid for each  Mortgage  Certificate  in an  aggregate  amount at least
equal to the Class  A-1  Retirement  Amount  minus the  Reserve  Fund  Available
Amount,  amounts on deposit in the  Certificate  Account and any amounts payable
pursuant to the Price  Maintenance  Agreement is tendered or until the remaining
bidders decline to submit any further Bids. The Certificate  Administrator shall
accept the  highest  Bids for each of the Fixed  Rate and the ARM  Certificates,
provided  the sum of such Bids is at least  equal to the  Class  A-1  Retirement
Amount  minus the  Reserve  Fund  Available  Amount,  amounts  on deposit in the
Certificate  Account and any amounts payable  pursuant to the Price  Maintenance
Agreement (and subject to the rights of the Price  Maintenance  Counterparty  to
purchase  the  Fixed  Rate  Certificates   pursuant  to  the  Price  Maintenance
Agreement).  The  highest  Bid for the Fixed Rate  Certificates  and for the ARM
Certificates  shall be the greater of the highest  Line Item Bid for each of the
Fixed Rate or ARM Certificates,  as applicable,  (including a Bid of $0 for each
such  Mortgage  Certificate  as to which no Line Item Bid was  received) and the
highest  All or  Nothing  Bid for the Fixed  Rate  Certificates  and for the ARM
Certificates. The Certificate Administrator shall choose between equivalent bids
based on such methods as it deems appropriate.

     (c) In the event that as of Initial  Auction  Date or any Auction  Date,  a
Credit  Event has  occurred  with  respect  to any Fixed Rate  Certificate,  the
Certificate  Administrator  shall  determine  the market value of a  residential
mortgage  pass-through  certificate (a "Comparable  Certificate")  comparable to
each Fixed Rate Certificate as to which a Credit Event has occurred, but for the
occurrence of the Credit Event. In the event that as of the Initial Auction Date
or any Auction  Date, a Credit Event has occurred with respect to any Fixed Rate
Certificate, the Certificate Administrator shall solicit bids in accordance with
Section 3.07(a) separately for the Fixed Rate Certificates as to which there has
and has not occurred a Credit Event. The Certificate  Administrator shall accept
the highest Bids for the Fixed Rate  Certificates  as to which there has and has
not  occurred a Credit Event and for the ARM  Certificates,  provided the sum of
such Bids is at least equal to the Class A-1 Retirement Amount minus the Reserve
Fund Available  Amount,  amounts on deposit in the  Certificate  Account and any
amounts payable pursuant to the Price Maintenance  Agreement (and subject to the
rights  of the  Price  Maintenance  Counterparty  to  purchase  the  Fixed  Rate
Certificates pursuant to the Price Maintenance Agreement).

     (d) In the event that there  exists an Unpaid  Interest  Shortfall or other
form of overdue  interest with respect to any Mortgage  Certificate  as to which
the Certificate Insurer has made an unreimbursed Guaranty Payment, the purchaser
of such Mortgage  Certificate  pursuant to the terms hereof shall be required to
execute a due bill with respect to such Unpaid Interest  Shortfall or other form
of overdue  interest in the form  attached  hereto as Exhibit M, in favor of the
Certificate Insurer.  The Certificate  Administrator shall deliver such executed
due bill to the Certificate Insurer.


<PAGE>

     (e) If Bids are accepted,  the Trustee shall enter into a forward  purchase
agreement, or other similar agreement,  with each of the highest bidders for the
sale of the applicable  Mortgage  Certificates,  on behalf of the Trust,  to the
successful  bidder  on the  Distribution  Date in the  month in which  such sale
occurs.  The Trustee shall  cooperate in any such sale by execution and delivery
of such  instruments,  and  documents  as  reasonably  may be  requested  by the
Certificate  Administrator  to  effect  the sale and  transfer  of the  Mortgage
Certificates.  In the event  that a payment  is due under the Price  Maintenance
Agreement and the Price Maintenance Counterparty elects to exercise it option to
purchase the Fixed Rate Certificates  rather than make a required  payment,  the
Trustee  shall  sell  the  Fixed  Rate  Certificates  to the  Price  Maintenance
Counterparty at the price specified in the Price  Maintenance  Agreement  rather
than to the highest  bidder.  In the event that, in connection  with the Initial
Auction or any Auction, a payment is due from the Price Maintenance Counterparty
with  respect  to  the  Fixed  Rate  Certificates,  and  the  Price  Maintenance
Counterparty  exercises  its option  under the Price  Maintenance  Agreement  to
purchase the Fixed Rate Certificates rather than make a payment thereunder,  the
Trustee  shall  enter  into a  forward  purchase  agreement,  or  other  similar
agreement,  with the Price Maintenance  Counterparty,  for the sale of the Fixed
Rate Certificates, on behalf of the Trust, to the Price Maintenance Counterparty
on the Distribution Date in the month in which such sale occurs.

     (f) If a Bid or Bids  equal to or in excess  of the  Class  A-1  Retirement
Amount,  minus the  Reserve  Fund  Available  Amount,  amounts on deposit in the
Certificate  Account and any amounts payable  pursuant to the Price  Maintenance
Agreement is or are not received by the Certificate  Administrator,  the Trustee
shall continue to hold the Mortgage Certificates, and this Trust Agreement shall
continue  in full  force  and  effect.  On each  subsequent  Auction  Date,  the
Certificate  Administrator  shall, on behalf of the Trustee,  solicit Bids until
the  earlier  of (i) the  acceptance  of a Bid at least  equal to the  Class A-1
Retirement Amount minus the Reserve Fund Available Amount, amounts on deposit in
the  Certificate   Account  and  any  amounts  payable  pursuant  to  the  Price
Maintenance  Agreement or (ii) the payment in full of all amounts  distributable
to the Class A-1 Certificateholders pursuant to this Trust Agreement.

     (g) The  Trustee  shall  deposit the  proceeds of any sale of the  Mortgage
Certificates  (the "Auction  Proceeds")  into the Certificate  Account.  Auction
Proceeds shall be distributed on the next  Distribution  Date by the Certificate
Administrator in accordance with Section 3.02(c) of this Trust Agreement.

     (h) Neither the  Certificate  Administrator  nor any Affiliate  thereof may
purchase any Mortgage Certificates pursuant to this Section 3.07 (other than the
Price Maintenance Counterparty).


<PAGE>

     Section 3.08. Yield Support  Agreement.  (a) The Trustee,  on behalf of the
Certificateholders, is hereby directed to enter into the Yield Support Agreement
on the Closing Date. The Trustee  agrees to comply with all of its  obligations,
and to seek the  enforcement  of all of its  rights,  under  the  Yield  Support
Agreement, and further agrees to take and follow all instructions and directions
as may be given by the Depositor and the Certificate  Administrator with respect
to the Yield Support  Agreement.  All payments under the Yield Support Agreement
(the "Yield Support Payments") shall be made to the Certificate Administrator by
the  Yield  Support  Counterparty  and  shall be  deposited  by the  Certificate
Administrator  into the Reserve Fund and  distributed in accordance with Section
3.02 of this Trust Agreement.  The Yield Support  Agreement shall be an asset of
the Trust Fund.

     (b) If a Yield Support  Counterparty Default occurs under the Yield Support
Agreement,  or any substitute  yield support  agreement then in place,  and as a
result  thereof the Yield  Support  Counterparty,  or  substitute  yield support
counterparty,  as applicable,  is obligated to pay any Settlement  Amount to the
Trustee thereunder, the Trustee, acting at the direction of the Depositor, shall
enter into a substitute yield support agreement and shall apply an amount not to
exceed the amount of the  Settlement  Amount as an up-front  payment,  as and if
necessary,  required to be made to the substitute yield support  counterparty in
connection  with the execution of such  agreement.  If any Settlement  Amount so
paid  by  the  Yield  Support   Counterparty,   or   substitute   yield  support
counterparty,  as applicable,  exceeds the amount of up-front payment payable to
the substitute  yield support  counterparty  under the substitute  yield support
agreement, then the excess shall be deposited into the Reserve Fund.

     Section 3.09. Price Maintenance  Agreement.  (a) The Trustee,  on behalf of
the  Certificateholders,  is hereby directed to enter into the Price Maintenance
Agreement  on the Closing  Date.  The  Trustee  agrees to comply with all of its
obligations,  and to seek the enforcement of all of its rights,  under the Price
Maintenance  Agreement,  and further agrees to take and follow all  instructions
and   directions  as  may  be  given  by  the  Depositor  and  the   Certificate
Administrator  with  respect  to the  Price  Maintenance  Agreement.  The  Price
Maintenance Agreement shall be an asset of the Trust Fund.

     (b) If a Price  Maintenance  Counterparty  Default  occurs  under the Price
Maintenance  Agreement,  or any similar  substitute price maintenance  agreement
then in place, and as a result thereof the Price  Maintenance  Counterparty,  or
substitute price maintenance  counterparty,  as applicable,  is obligated to pay
any  Settlement  Amount to the Trustee  thereunder,  the Trustee,  acting at the
direction  of the  Depositor,  shall enter into a substitute  price  maintenance
agreement  and shall apply an amount not to exceed the amount of the  Settlement
Amount as an up-front payment,  as and if necessary,  required to be made to the
substitute  price  maintenance  counterparty in connection with the execution of
such  agreement.  If any  Settlement  Amount  so paid by the  Price  Maintenance
Counterparty,  or substitute  price  maintenance  counterparty,  as  applicable,
exceeds  the  amount  of  up-front  payment  payable  to  the  substitute  price
maintenance counterparty under the substitute price maintenance agreement,  then
the excess  shall be  deposited  into the Reserve Fund in respect of the Class R
Certificate.


<PAGE>

     Section 3.10. Notices Under Policy.

     On or before each  Underlying  Series  Distribution  Date, the  Certificate
Administrator  shall  (i)  prepare,  or cause to be  prepared,  on behalf of the
Certificateholders,  the Notice of Claim if the  Certificate  Administrator  has
determined,  based on Mortgage Certificate Distribution Date Statements received
by it, that,  with respect to such  Underlying  Series  Distribution  Date,  the
Certificate  Insurer will be required to make a Guaranty Payment pursuant to the
terms of the Policy and (ii)  deliver  such  Notice of Claim to the  Certificate
Insurer no later than 12:00 noon (New York City time) on such Underlying  Series
Distribution Date. Such Notice of Claim shall be prepared in accordance with the
procedures  prescribed in the Policy. The Certificate  Administrator  shall take
such actions (including the negotiation,  settlement,  compromise or enforcement
of the  Notice of Claim) as shall be  necessary  to realize  recovery  under the
Policy.  Any failure by the Certificate  Administrator  to deliver the Notice of
Claim timely in accordance with the terms of this Section 3.10 that results from
the  failure of the  trustee  for any  Underlying  Series to deliver the related
Mortgage  Certificate  Distribution  Date Statement  timely will not be deemed a
default   by  the   Certificate   Administrator   under   this   Section   3.10.
Notwithstanding the foregoing, the Certificate  Administrator shall use its best
efforts to cause the trustee for each  Underlying  Series to deliver the related
Mortgage Certificate Distribution Date Statements to it timely.

<PAGE>


                                   ARTICLE IV

                                The Certificates
                                ----------------

     Section 4.01. The Certificates.

     (a) The  Certificates  shall be issued as Class A-1,  Class IO, and Class R
Certificates substantially in the respective forms set forth in Exhibits A, B, C
and D (reverse side of  Certificates).  The aggregate  Principal  Balance of all
Certificates  of each  Class  issued as of the  Closing  Date  shall  equal such
Class's respective Original Principal Balance.  The Certificates shall be issued
in minimum  denominations of a Single Certificate and, with respect to the Class
A-1  Certificates,  integral  multiples of $1,000 initial  Principal  Balance in
excess thereof,  except for one Class A-1 Certificate which may be issued in any
denomination in excess of a Single Certificate. There shall be only one Class IO
Certificate and Class R Certificate.  The Certificates shall, on original issue,
be executed by the Certificate Administrator, not in its individual capacity but
solely  as  Certificate  Administrator,   authenticated  by  the  Registrar  and
delivered by the Certificate Administrator to or upon the order of the Depositor
upon  receipt by the Trustee of the  Mortgage  Certificates  pursuant to Section
2.01 hereof.  Each  Certificate  shall be in fully  registered form and shall be
numbered  serially for  identification.  The  Certificates  shall be executed by
manual or facsimile signature on behalf of the Certificate  Administrator by any
Responsible  Officer  thereof.  Certificates  bearing  the  manual or  facsimile
signatures  of  individuals  who were,  at the time when  such  signatures  were
affixed,  authorized to sign on behalf of the  Certificate  Administrator  shall
bind the Certificate Administrator, notwithstanding that such individuals or any
of them have ceased to be so  authorized  prior to the execution and delivery of
such  Certificates.  No Certificate  shall be entitled to any benefit under this
Trust Agreement, or be valid for any purpose, unless such Certificate shall have
been manually authenticated by the Registrar substantially in the form set forth
in Exhibit A, B, C or D hereto,  and such manual  signature upon any Certificate
shall be conclusive evidence,  and the only evidence,  that such Certificate has
been duly authenticated and delivered hereunder. All Certificates shall be dated
the date of their authentication and delivery.

     Until such time as Definitive  Certificates  are issued pursuant to Section
4.05, each Book-Entry Certificate shall bear the following legend:

     "Unless this  certificate is presented by an authorized  representative  of
[the  Clearing  Agency]  to  the  Certificate  Administrator  or its  agent  for
registration of transfer,  exchange or payment,  and any  certificate  issued is
registered in the name of [the Clearing  Agency] or such other name as requested
by an authorized representative of [the Clearing Agency] and any payment is made
to  [the  Clearing  Agency]  or to  such  other  entity  as is  requested  by an
authorized  representative  of the [Clearing  Agency],  any transfer,  pledge or
other use hereof for value or  otherwise  by or to any person is wrongful  since
the registered owner hereof, [the Clearing Agency], has an interest herein."


<PAGE>

     (b) Upon original issuance, the Book-Entry  Certificates shall be issued in
the  form  of one or  more  typewritten  certificates,  to be  delivered  to The
Depository Trust Company,  the initial Clearing Agency, by, or on behalf of, the
Depositor.  Such  Certificates  shall initially be registered on the Certificate
Register  in the name of the  nominee of the  initial  Clearing  Agency,  and no
Beneficial  Owner  shall  receive a  definitive  certificate  representing  such
Beneficial Owner's interest in the Book-Entry  Certificates,  except as provided
in Section 4.05.  Unless and until  definitive,  fully  registered  certificates
("Definitive  Certificates")  have been issued to Beneficial  Owners pursuant to
Section 4.05:

          (i)  the provisions of this Section 4.01(b) shall be in full force and
               effect;

          (ii) the Depositor, the Certificate  Administrator,  the Registrar and
               the Trustee may deal with the  Clearing  Agency for all  purposes
               (including  the  making  of   distributions   on  the  Book-Entry
               Certificates  and  the  taking  of  actions  by  the  Holders  of
               Book-Entry Certificates) as the authorized  representative of the
               Beneficial Owners;

          (iii)to the  extent  that  the  provisions  of  this  Section  4.01(b)
               conflict  with  any  other  provisions  of  this  Agreement,  the
               provisions of this Section 4.01(b) shall control;

          (iv) the rights of Beneficial  Owners shall be exercised  only through
               the Clearing Agency and shall be limited to those  established by
               law, the rules, regulations and procedures of the Clearing Agency
               and agreements  between such  Beneficial  Owners and the Clearing
               Agency  and/or  the  Clearing   Agency   Participants,   and  all
               references  in this  Agreement  to actions by  Certificateholders
               shall,  with  respect to the  Book-Entry  Certificates,  refer to
               actions taken by the Clearing Agency upon  instructions  from the
               Clearing  Agency   Participants,   and  all  references  in  this
               Agreement to  distributions,  notices,  reports and statements to
               Certificateholders   shall,   with  respect  to  the   Book-Entry
               Certificates,  refer  to  distributions,   notices,  reports  and
               statements to the Clearing  Agency or its nominee,  as registered
               holder of the  Book-Entry  Certificates,  as the case may be, for
               distribution   to  Beneficial   Owners  in  accordance  with  the
               procedures of the Clearing Agency; and

          (v)  the Clearing  Agency shall make  book-entry  transfers  among the
               Clearing   Agency   Participants   and   receive   and   transmit
               distributions  of principal and interest on the  Certificates  to
               the  Clearing  Agency  Participants,  for  distribution  by  such
               Clearing Agency  Participants  to the Beneficial  Owners or their
               nominees.


<PAGE>

     For purposes of any  provision of this  Agreement  requiring or  permitting
actions  with the  consent of, or at the  direction  of,  Holders of  Book-Entry
Certificates  evidencing  specified voting interests,  such direction or consent
shall be given by  Beneficial  Owners  having the  requisite  voting  interests,
acting through the Clearing Agency.

     Unless and until  Definitive  Certificates  have been issued to  Beneficial
Owners pursuant to Section 4.05, copies of the reports or statements referred to
in Section 3.04 shall be available to Beneficial  Owners upon written request to
the Certificate Administrator at the Corporate Trust Office.

     Section 4.02.  Registration  of and Limitations on Transfer and Exchange of
Certificates.

     (a) The Registrar  shall cause to be kept at its  Corporate  Trust Office a
Certificate Register in which, subject to such reasonable  regulations as it may
prescribe,  the Registrar shall provide for the registration of Certificates and
of transfers and exchanges of Certificates as herein provided.

     Subject to the restrictions and limitations set forth below, upon surrender
for  registration  of transfer of any Certificate at the Corporate Trust Office,
the Certificate Administrator shall execute and the Registrar shall authenticate
and deliver,  in the name of the designated  transferee or  transferees,  one or
more new Certificates of the same Class in authorized  denominations  evidencing
the same aggregate Percentage Interests.

     (b) No transfer of a Class IO or Class R  Certificate  shall be made unless
such transfer is exempt from the registration requirements of the Securities Act
and any  applicable  state or  foreign  securities  laws.  In the event that any
transfer  is to be made,  (i) unless  such  transfer is made in reliance on Rule
144A of the Securities  Act by a Person not an affiliate of the  Depositor,  the
Certificate  Administrator  or the Depositor  may, if the transfer is to be made
within  three years from the date of the later of (A) the  Closing  Date and (B)
the last date on which the  Depositor or any  affiliate of the Depositor was the
beneficial owner of the Class IO or Class R Certificate  which is proposed to be
transferred,  require a written Opinion of Counsel acceptable to and in form and
substance  satisfactory to the Certificate  Administrator and the Depositor,  to
the effect that such transfer may be made  pursuant to an exemption,  describing
the applicable exemption and the basis therefor, from the Securities Act and any
applicable state or foreign  securities laws, which Opinion of Counsel shall not
be an expense of the Certificate Administrator, the Trustee or the Depositor and
(ii) the Depositor and the Certificate Administrator shall require an investment
representation  letter  in the  form  of  Exhibit  E or  Exhibit  F  hereto  (an
"Investment  Representation  Letter") from the proposed transferee  addressed to
the Depositor and the Certificate  Administrator.  The Investment Representation
Letter shall not be an expense of the Certificate Administrator,  the Trustee or
the  Depositor.  The  Holder of a  transferred  Class IO or Class R  Certificate
shall,  and does  hereby  agree  to,  indemnify  the  Trustee,  the  Certificate
Administrator  and the Depositor  against any  liability  that may result if the
transfer is not so exempt from such federal, state and foreign laws.


<PAGE>

     (c) No transfer of a Class IO or Class R  Certificate  shall be made unless
the Certificate  Administrator  shall have received either (i) a  representation
letter from the  transferee of such Class IO or Class R Certificate  in the form
of  Exhibit E or F hereto,  to the  effect  that (a) such  transferee  is not an
employee  benefit plan subject to the  fiduciary  responsibility  provisions  of
ERISA,  a plan  subject to Section  4975 of the Code or a  governmental  plan as
defined  in  Section  3(32) of  ERISA or Code  Section  4975 or  subject  to any
federal,  state or local law  ("Similar  Law")  which is, to a material  extent,
similar  to the  foregoing  provisions  of ERISA or the  Code  (collectively,  a
"Plan"),  and is not a person  acting  on  behalf  of any such Plan or using the
"plan assets" of a Plan, which representation  letter shall not be an expense of
the Depositor,  the  Certificate  Administrator  or the Trustee,  or (b) if such
transferee  is an  insurance  company,  the source of funds used to purchase the
Class IO or Class R Certificate is an "insurance  company  general  account" (as
such term is defined in Section V(e) of Prohibited  Transaction  Class Exemption
95-60 ("PTE  95-60"),  60 Fed.  Reg.  35925 (July 12, 1995) and there is no Plan
with  respect  to which  the  amount  of such  general  account's  reserves  and
liabilities for the contract(s)  held by or on behalf of such Plan and all other
Plans  maintained  by the same  employer  (or  affiliate  thereof  as defined in
Section V(a)(1) of PTE 95-60) or by the same employee  organization,  exceed 10%
of the total of all reserves and  liabilities  of such general  account (as such
amounts  are  determined  under  Section  I(a)  of PTE  95-60)  at the  date  of
acquisition,  or (ii) in the  case of any such  Class IO or Class R  Certificate
presented for registration in the name of a Plan, or a trustee of any such Plan,
an Opinion of Counsel,  satisfactory  to the Certificate  Administrator  and the
Depositor,  to the effect that the purchase or holding of such Class IO or Class
R  Certificate  will not (a) result in the assets of the Trust Fund being deemed
"plan assets" and subject to the prohibited  transaction provisions of ERISA and
the Code or  Similar  Law or (b)  subject  the  Certificate  Administrator,  the
Trustee or the Depositor to any  obligation  in addition to those  undertaken in
this  agreement,  which  Opinion  of  Counsel  shall  not be an  expense  of the
Certificate Administrator,  the Trustee or the Depositor. The Class IO and Class
R  Certificates  shall bear a legend  referring  to the  foregoing  restrictions
contained in this paragraph.

     (d) No legal or  beneficial  interest  in all or any portion of the Class R
Certificate  may  be  transferred  directly  or  indirectly  to a  "disqualified
organization"  within the meaning of Code  Section  860E(e)(5)  or an agent of a
disqualified  organization (including a broker, nominee or middleman), to a Plan
or a Person  investing  the assets of a Plan  (such  Plan or  Person,  an "ERISA
Prohibited  Holder")  or to an  individual,  corporation,  partnership  or other
person unless such transferee (i) is not a Non-U.S. Person or (ii) is a Non-U.S.
Person that holds the Class R Certificate  in  connection  with the conduct of a
trade or business  within the United States and has furnished the transferor and
the Certificate  Administrator  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 Certificate  Administrator an opinion of a nationally recognized tax counsel
to  the  effect  that  the  transfer  of the  Class  R  Certificate  to it is in
accordance with the  requirements  of the Code and the  regulations  promulgated
thereunder  and that  such  transfer  of the  Class R  Certificate  shall not be
disregarded  for federal income tax purposes (any such person who is not covered
by clauses (i), (ii) or (iii) above being referred to herein as a "Non-permitted

<PAGE>

Foreign  Holder"),  and any such  purported  transfer  shall be void and have no
effect.  The  Certificate   Administrator  shall  not  execute,  and  shall  not
authenticate (or cause to authenticate)  and deliver,  a new Class R Certificate
in connection  with any such transfer to a  disqualified  organization  or agent
thereof (including a broker,  nominee or middleman),  an ERISA Prohibited Holder
or a Non-permitted Foreign Holder, and neither the Registrar nor the Certificate
Administrator shall accept a surrender for transfer or registration of transfer,
or register the transfer of, the Class R Certificate (other than with respect to
the transfer of the Class R Certificate to the Underwriter), unless the proposed
transferee shall have provided to the Certificate  Administrator  and transferor
an affidavit,  substantially in the form attached as Exhibit G hereto, signed by
such  proposed  transferee,  to the  effect  that the  transferee  is not such a
disqualified  organization,  an agent (including a broker, nominee or middleman)
for any  entity as to which the  transferee  has not  received  a  substantially
similar affidavit, an ERISA Prohibited Holder or a Non-permitted Foreign Holder,
which  affidavit  shall  contain  the  consent  of the  transferee  to any  such
amendments  of this  Agreement  as may be  required  to further  effectuate  the
foregoing  restrictions  on transfer of the Class R Certificate to  disqualified
organizations,  ERISA Prohibited Holders or Non-permitted  Foreign Holders. Such
affidavit  shall also  contain  the  statement  of the  transferee  that (i) the
transferee has historically  paid its debts as they have come due and intends to
do so in  the  future,  (ii)  the  transferee  understands  that  it  may  incur
liabilities in excess of cash flows  generated by the residual  interest,  (iii)
the  transferee  intends  to pay taxes  associated  with  holding  the  residual
interest as they become due and (iv) the transferee shall not transfer the Class
R Certificate to any Person who does not provide an affidavit  substantially  in
the form attached as Exhibit G hereto.

     The  affidavit  described in the  preceding  paragraph,  if not executed in
connection  with the  initial  issuance  of the  Class R  Certificate,  shall be
accompanied  by a written  statement  in the form  attached as Exhibit H hereto,
signed by the transferor, to the effect that as of the time of the transfer, the
transferor  has no  actual  knowledge  that  the  transferee  is a  disqualified
organization,  ERISA Prohibited Holder or Non-permitted  Foreign Holder, and has
no knowledge or reason to know that the statements  made by the transferee  with
respect to clauses (i) and (iii) of the last sentence of the preceding paragraph
are not true.  The Class R  Certificate  shall  bear a legend  referring  to the
foregoing restrictions contained in this paragraph and the preceding paragraph.

     Upon notice to a Responsible Officer of the Certificate  Administrator that
any legal or beneficial  interest in any portion of the Class R Certificate  has
been  transferred,  directly or indirectly,  to a disqualified  organization  or
agent thereof (including a broker, nominee or middleman) in contravention of the
foregoing restrictions,  (i) such transferee shall be deemed to hold the Class R
Certificate  in  constructive  trust  for  the  last  transferor  who  was not a
disqualified  organization  or  agent  thereof,  and  such  transferor  shall be
restored  as the owner of such  Class R  Certificate  as  completely  as if such
transfer had never occurred,  provided that the Certificate  Administrator  may,
but is not required to, receive any  distributions  made to such transferee with
respect  to the  Class R  Certificate,  and (ii) the  Certificate  Administrator
agrees to furnish the  Internal  Revenue  Service and to any  transferor  of the
Class R Certificate or such agent (within 60 days of the request therefor by the
transferor  or agent) such  information  necessary  to the  application  of Code
Section 860E(e) as may be required by the Code, including but not limited to the
present value of the total  anticipated  excess  inclusions  with respect to the
Class R Certificate (or portion thereof) for periods after such transfer. At the
election of the Certificate Administrator,  the cost of computing and furnishing
such  information  may be charged to the  transferor  or such agent  referred to
above; however, the Certificate  Administrator shall in no event be excused from
furnishing such information.


<PAGE>

     (e) At the option of the Certificateholders,  Certificates may be exchanged
for other Certificates of the same Class in authorized  denominations evidencing
the same aggregate Percentage Interests upon surrender of the Certificates to be
exchanged  at  the  Corporate  Trust  Office  of  the  Registrar.  Whenever  any
Certificates  are so surrendered  for exchange,  the  Certificate  Administrator
shall execute and the Registrar shall  authenticate and deliver the Certificates
which 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  Registrar) be duly endorsed by, or be  accompanied
by a written  instrument of transfer in form  satisfactory to the Registrar duly
executed by, the Holder  thereof or his  attorney  duly  authorized  in writing.
Certificates  delivered  upon any such transfer or exchange  shall  evidence the
same  obligations,  and shall be entitled to the same rights and privileges,  as
the Certificates surrendered.

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

     All  Certificates  surrendered  for  registration  of transfer and exchange
shall  be  canceled  by  the  Registrar   and   delivered  to  the   Certificate
Administrator  for  subsequent  destruction  without  liability  on the  part of
either.

     Section 4.03. Mutilated, Destroyed, Lost or Stolen Certificates. If (i) any
mutilated  Certificate  is  surrendered  to the  Registrar  or  the  Certificate
Administrator 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 Certificate  Administrator such security or indemnity as may be
required  by it to save it and the  Registrar  harmless,  then  the  Certificate
Administrator shall execute and the Registrar shall authenticate and deliver, in
exchange  for or in lieu  of any  such  mutilated,  destroyed,  lost  or  stolen
Certificate,  a  new  Certificate  of  like  tenor  but  bearing  a  number  not
contemporaneously  outstanding.  Upon the issuance of any new Certificate  under
this Section 4.03,  the Registrar 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
Certificate  Administrator or the Registrar) connected therewith.  Any duplicate
Certificate  issued  pursuant to this  Section  shall  constitute  complete  and
indefeasible  evidence  of  ownership  of  a  like  Percentage  Interest  as  if
originally  issued,  whether or not the lost,  stolen or  destroyed  Certificate
shall be found at any time. All Certificates  surrendered to the Registrar under
the terms of this Section 4.03 shall be canceled by the  Registrar and delivered
to the Certificate Administrator for subsequent destruction without liability on
the part of either.


<PAGE>

     Section  4.04.  Persons  Deemed  Owners.  Prior  to due  presentation  of a
Certificate  for  registration  of  transfer,   the  Trustee,   the  Certificate
Administrator,  the  Certificate  Insurer,  the  Registrar  and any agent of the
Trustee, the Certificate Administrator, the Certificate Insurer or the Registrar
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
3.02 and at any other time for all other  purposes  whatsoever,  and none of the
Trustee, the Certificate Administrator, the Certificate Insurer or the Registrar
nor any agent of the Trustee,  the  Certificate  Administrator,  the Certificate
Insurer or the Registrar shall be affected by notice to the contrary.

     Section 4.05. Definitive Certificates.  (a) If (i)(A) the Depositor advises
the Certificate  Administrator  in writing that the Clearing Agency is no longer
willing or able properly to discharge its  responsibilities  as depository  with
respect to the Book-Entry Certificates, and (B) the Certificate Administrator is
unable to locate a  qualified  successor,  (ii) the  Depositor,  at its  option,
advises the Certificate Administrator in writing that it elects to terminate the
book-entry  system  through  the  Clearing  Agency  or (iii)  Beneficial  Owners
representing   Percentage  Interests  aggregating  not  less  than  51%  of  the
Book-Entry  Certificates  advise  the  Certificate   Administrator  through  the
Clearing   Agency  and  Clearing   Agency   Participants  in  writing  that  the
continuation of a book-entry  system through the Clearing Agency is no longer in
the best interests of the Beneficial Owners, the Certificate Administrator shall
notify the Beneficial Owners,  through the Clearing Agency, of the occurrence of
any such event and of the availability of Definitive  Certificates to Beneficial
Owners  requesting the same. Upon surrender to the Certificate  Administrator by
the  Clearing  Agency  of the  Certificates  held  of  record  by  its  nominee,
accompanied  by  re-registration  instructions  and  directions  to execute  and
authenticate new Certificates from the Depositor, the Certificate  Administrator
shall  execute and  authenticate  Definitive  Certificates  for  delivery at its
Corporate  Trust Office.  The  Certificate  Administrator  shall arrange for the
printing  and  issuance  of such  Definitive  Certificates,  the  cost of  which
printing and issuance  shall be an expense of: (X) the Trust Fund in the case of
the issuance of Definitive  Certificates  under the  circumstances  described in
clause (i) of this paragraph (a); and (Y) the Depositor or the Beneficial Owners
so  advising  the  Certificate  Administrator  in the  case of the  issuance  of
Definitive  Certificates  under the circumstances  described in clauses (ii) and
(iii),  respectively,   of  this  paragraph  (a).  Neither  the  Depositor,  the
Certificate  Administrator  nor the  Trustee  shall be  liable  for any delay in
delivery of such  instructions by the Clearing Agency and may conclusively  rely
on, and shall be protected in relying on, such instructions.

     Section  4.06.  Notices  to  Clearing  Agency.  Whenever  notice  or  other
communication  to the Holders of Book-Entry  Certificates is required under this
Agreement,  unless and until Definitive  Certificates  shall have been issued to
Beneficial Owners pursuant to Section 4.05, the Certificate  Administrator shall
give all such notices and communications specified herein to be given to Holders
of Book-Entry Certificates to the Clearing Agency.

<PAGE>


                                    ARTICLE V

                          The Certificate Administrator
                          -----------------------------

     Section  5.01.   Representations   and   Warranties   of  the   Certificate
Administrator.  The  Certificate  Administrator  represents  and warrants to the
Depositor,  the  Trustee  and the  Certificate  Insurer,  for the benefit of the
Certificateholders, that this Trust Agreement has been executed and delivered by
an authorized officer of the Certificate Administrator who is duly authorized to
execute and deliver such document in such capacity on its behalf.

     Section 5.02. Directions to the Certificate Administrator.  The Certificate
Administrator is hereby directed:

     (a)  to  issue,   execute,   authenticate   and  deliver  the  Certificates
substantially  in  the  forms  attached  hereto  as  Exhibits  A,  B, C and D in
accordance with the terms of this Trust Agreement; and

     (b) to take all other actions as shall be required to be taken by the terms
of this Trust Agreement.

     Section 5.03.  Returns.  The  Certificate  Administrator,  on behalf of the
Trust, shall prepare, and the Trustee shall execute,  income tax and information
returns for each taxable year (the "REMIC  Returns")  for the Trust REMIC as may
be required under the REMIC Provisions and any other applicable  federal,  state
or local laws. The Certificate Administrator shall maintain such information and
records,   including  but  not  limited  to  the  income,   expenses,   Mortgage
Certificates,  other assets and  liabilities  of the Trust Fund,  including  the
Trust REMIC,  and the adjusted basis of the Trust REMIC  property  determined at
such  intervals  as may  be  required  by the  Code,  as  may be  necessary  and
appropriate to enable the  preparation  of any such returns,  and shall take any
and all actions necessary to ensure that any such returns are prepared and filed
as required by this  Section  5.03 and  applicable  law.  The fiscal year of the
Trust and the Trust REMIC shall be the calendar  year and the books of the Trust
REMIC shall be maintained on the accrual method of accounting.  The  Certificate
Administrator shall also prepare and forward to the  Certificateholders  and the
Trustee all  information  reports or tax returns  required  with  respect to the
Trust REMIC (including information relating to interest, original issue discount
and  market   discount)   as  and  when   required   to  be   provided   to  the
Certificateholders,  and to the Internal Revenue Service and other  governmental
authorities in accordance  with the REMIC  Provisions  and any other  applicable
federal, state or local laws.

     Section 5.04.  Election of REMIC Status.  The parties intend that the Trust
REMIC  shall  constitute,  and that the  affairs  of the  Trust  REMIC  shall be
conducted so as to qualify it as, a REMIC.  In such manner as may be required by
the Code, the Certificate Administrator,  on behalf of the Trust, shall elect to
treat  the  Trust  REMIC as a REMIC  and make the  appropriate  designations  in
accordance  with  Section  2.04 hereof on the  federal  income tax return of the
Trust REMIC for its first taxable year, in accordance with the REMIC Provisions.
The  Certificate  Administrator,  on behalf of the Trust  REMIC,  shall make all
other tax  elections  that may be required  for the  qualification  of the Trust
REMIC as a REMIC under federal or state law.


<PAGE>

     Section  5.05.   Compliance   with  REMIC   Provisions.   The   Certificate
Administrator  shall  (a) pay on behalf  of the  Trust  REMIC the  amount of any
federal income tax, including, without limitation, prohibited transaction taxes,
taxes  on  net  income  from   foreclosure   property,   and  taxes  on  certain
contributions  to the Trust REMIC after the Closing  Date,  imposed on the Trust
REMIC when and as the same shall be due and payable (but such  obligation  shall
not prevent the Certificate  Administrator or any other appropriate  Person from
contesting  any such tax in  appropriate  proceedings  and shall not prevent the
Certificate Administrator from withholding or depositing payment of such tax, if
permitted by law,  pending the outcome of such  proceedings);  and (b) within 30
days of the  Closing  Date,  furnish or cause to be  furnished  to the  Internal
Revenue  Service,  on Form 8811 or as may otherwise be required by the Code, the
name,  title and address of the person that  Certificateholders  may contact for
tax   information   relating  to  their   Certificates   (and  the   Certificate
Administrator  shall  act as the  representative  of the  Trust  REMIC  for this
purpose),  together with such additional  information as may be required by such
Form, and shall update such  information at the time and in the manner  required
by the Code. The  Certificate  Administrator  shall be entitled to be reimbursed
pursuant to Section  3.01 for any taxes paid by it pursuant to clause (a) of the
preceding  sentence,  except to the extent  that such  taxes are  imposed as the
result of the bad faith,  willful  misfeasance or negligence of the  Certificate
Administrator in the performance of its obligations  hereunder.  The Certificate
Administrator (x) shall not take any action, or omit to take any action, if such
action or  omission  may cause the  Trust  REMIC to fail to  qualify  as a REMIC
during any taxable year,  (y) shall  exercise  reasonable  care not to allow the
occurrence of any Prohibited Transaction,  unless the Certificate  Administrator
shall have provided an Opinion of Counsel (which opinion shall be at the expense
of the Person  proposing such  transaction)  to the Trustee that such occurrence
would not (i) result in a gain,  (ii) otherwise  subject the Trust REMIC to tax,
or (iii)  cause  the  Trust  REMIC to fail to  qualify  as a REMIC and (z) shall
exercise reasonable care not to allow the Trust REMIC to receive income from the
performance of services or from assets not permitted under the REMIC  Provisions
to be held by a REMIC.

     Section 5.06.  Terms of REMIC Interests and Tax Reporting.  Notwithstanding
any  other  provision  of  this  Agreement  to  the  contrary,  the  Certificate
Administrator agrees to treat the REMIC regular and residual interests as having
the terms  described in this Section 5.06 for federal  income tax  reporting and
all other  federal  income  tax  purposes.  This  Agreement  is  intended  to be
construed consistently with the characterization contained in this Section 5.06.

     For  federal  income tax  purposes,  the Class A-1  Certificates  represent
ownership of both a REMIC regular  interest and a  contractual  right to receive
amounts from the Reserve Fund. The regular  interest  corresponding to the Class
A-1  Certificates has a principal amount which at all times equals the Principal
Balance  of the  Class A-1  Certificates  and  bears  interest  at the Class A-1
Pass-Through  Rate,  subject to a maximum  rate equal to the rate  specified  in
clause (X) of the definition of Class IO Pass-Through Rate.


<PAGE>

     The Class IO  Certificate  is also a REMIC regular  interest.  The Class IO
Certificate is not entitled to principal  payments and has a notional  principal
balance  which at all times  equals the Class IO Notional  Amount.  The Class IO
Certificate bears interest at a rate equal to the Class IO Pass-Through Rate.

     The Class R Certificate  is the residual  interest in the Trust REMIC.  The
Class R Certificate  is entitled to interest  earned on amounts  invested in the
Certificate  Account  and  any  other  amounts  with  respect  to  the  Mortgage
Certificates  which are not paid to the regular  interest  relating to the Class
A-1 Certificates or to the Class IO Certificate.

     Distributions  on the Class IO Certificate and the Class R Certificate will
be deposited in the Reserve  Fund.  In the event that the  distributions  on the
Class IO Certificate and the Class R Certificate in any Interest  Accrual Period
constitute  Interest  Accrual  Amounts  paid  with  respect  to  the  Class  A-1
Certificates for such period,  such amounts will first be deemed to be deposited
in the Reserve  Fund and then will be deemed paid with  respect to the Class A-1
Certificates from the Reserve Fund.  Similarly,  in connection with a "qualified
liquidation"  of the Trust  REMIC  meeting  the  requirements  of Section  7.03,
amounts  distributed with respect to the Class A-1 Certificates in excess of the
outstanding principal amount and current interest amount on the regular interest
corresponding  to the Class A-1  Certificates  will first be deemed  paid to the
Reserve  Fund and then  will be  deemed  paid  with  respect  to the  Class  A-1
Certificates from the Reserve Fund.

     Section 5.07. Limitation on Liability of the Certificate  Administrator and
Others.  Neither  the  Certificate  Administrator  nor  any  of  its  directors,
officers,  employees  or  agents  shall be under any  liability  to the Trust or
Certificateholders  for any action taken,  or for refraining  from the taking of
any action,  in good faith  pursuant to this Trust  Agreement,  or for errors in
judgment;   provided,  however,  that  this  provision  shall  not  protect  the
Certificate  Administrator  or any other such person 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
obligations  and  duties  hereunder.  The  Certificate   Administrator  and  its
directors,  officers, employees or agents may rely in good faith on any document
of any kind  prima  facie  properly  executed  and/or  submitted  by any  Person
respecting any matter arising hereunder.

     Section 5.08.  Merger or  Consolidation  of the Certificate  Administrator;
Transfer of Duties.  Any Person into which the Certificate  Administrator may be
merged or consolidated,  or any person resulting from any merger,  conversion or
consolidation  to which the Certificate  Administrator  shall be a party, or any
Person succeeding to the business of the Certificate Administrator, shall be the
successor of the Certificate  Administrator 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;  provided,  however,  that any
such  successor  or  resulting  Person  shall  have a net worth of not less than
$50,000,000.


<PAGE>

     Notwithstanding  anything to the contrary  contained in this Section  5.08,
the Certificate  Administrator may assign its rights and delegate its duties and
obligations   under  this   Agreement  to  an   affiliate  of  the   Certificate
Administrator,  provided that the Certificate  Administrator shall remain liable
for all such duties and obligations under this Trust Agreement. In addition, the
Certificate  Administrator  may assign or  delegate  its duties and  obligations
hereunder  to any  unaffiliated  Person;  provided  that  (i) the  purchaser  or
transferee accepting such assignment or delegation shall be a Person which shall
be satisfactory to the Trustee and the  Certificate  Insurer,  in the reasonable
exercise  of its  judgment,  and shall  execute  and  deliver to the  Trustee an
agreement,  in form and substance reasonably satisfactory to the Trustee and the
Certificate  Insurer,   which  contains  an  assumption  by  such  purchaser  or
transferee of the due and punctual  performance  and observance of each covenant
and condition to be performed or observed by the Certificate Administrator under
this Trust  Agreement from and after the date of such agreement and (ii) none of
the Rating Agency's ratings of the Certificates in effect  immediately  prior to
such  assignment,  sale or transfer would be qualified,  downgraded or withdrawn
and the Certificates would not be placed on credit review status (other than for
possible upgrading) as a result of such assignment, sale or transfer.

     In the  case  of any  assignment  and  delegation  of  rights,  duties  and
obligations  under this Trust  Agreement  to a Person other than an affiliate of
the  Certificate  Administrator  pursuant to this Section 5.08, the  Certificate
Administrator shall be released from its duties and obligations under this Trust
Agreement, except that the Certificate Administrator shall remain liable for all
liabilities  and  obligations  incurred  by  it  as  Certificate   Administrator
hereunder  prior to the  satisfaction  of the conditions to such  assignment and
delegation set forth in clauses (i) and (ii) of the preceding paragraph.

     Section 5.09.  Reports by Certificate  Administrator.  (a) The  Certificate
Administrator  shall deliver to the Trustee and the Certificate  Insurer,  on or
before April 30 of each year beginning in 1996, an Officer's Certificate stating
as to  each  signer  thereof,  that  (i) a  review  of  the  activities  of  the
Certificate  Administrator  during  the  preceding  calendar  year  and  of  its
performance  under this  Trust  Agreement  has been made  under  such  officer's
supervision,  and (ii) to the best of such  officer's  knowledge,  based on such
review,  the Certificate  Administrator  has fulfilled all its obligations under
this Trust Agreement throughout such year, or if there has been a default in the
fulfillment of any such  obligation,  specifying each such default known to such
officer and the nature and status thereof.  Copies of such statement shall, upon
request, be provided to any Certificateholder by the Certificate  Administrator,
or by the Trustee at the Certificate  Administrator's expense if the Certificate
Administrator shall fail to provide such copies.

     (b) Not later than 15 days after each  Distribution  Date, the  Certificate
Administrator  shall  provide  to the  Trustee  and the  Certificate  Insurer  a
statement setting forth the status of the Certificate Account as of the close of
business  on the  related  Distribution  Date,  stating  that all  distributions
required by this Agreement to be made by the Certificate Administrator have been
made  (or if any  required  distribution  has not been  made by the  Certificate
Administrator,  specifying the nature and status thereof) for the period covered
by such statement in Section 3.01. Copies of such statement shall be provided by
the Certificate  Administrator to any Certificateholder  upon request (or by the
Trustee  at  the   Certificate   Administrator's   expense  if  the  Certificate
Administrator shall fail to provide such copies).


<PAGE>

     (c) The  Certificate  Administrator  shall  file with the  Trustee  and the
Commission  (with a copy to the Certificate  Insurer),  within 15 days after the
Depositor is required to file the same with the Commission, copies of the annual
reports and of the  information,  documents and other reports (or copies of such
portions  of any of the  foregoing  as the  Commission  may from time to time by
rules and  regulations  prescribe)  which the  Depositor may be required to file
with the Commission  pursuant to Section 13 or 15(d) of the Securities  Exchange
Act;  or, if the  Depositor is not  required to file  information,  documents or
reports pursuant to either of said sections,  then it will file with the Trustee
and the Commission,  in accordance  with rules and  regulations  prescribed from
time  to  time  by the  Commission,  such  of  the  supplementary  and  periodic
information,  documents and reports which may be required pursuant to Section 13
of the Securities Exchange Act in respect of a security listed and registered on
a national  securities  exchange as may be prescribed  from time to time in such
rules and regulations;

     (d) The  Certificate  Administrator  shall  file with the  Trustee  and the
Commission (with a copy to the Certificate Insurer) in accordance with rules and
regulations  prescribed  from time to time by the  Commission,  such  additional
information,  documents  and reports with respect to compliance by the Depositor
with the  conditions  and  covenants of this Trust  Agreement as may be required
from time to time by such rules and regulations

     Section 5.10.  Certificate  Administrator's  Fees.  (a) The Tax  Beneficial
Holder covenants and agrees to pay to the Certificate Administrator all fees and
expenses for all services to be rendered by the Certificate Administrator in the
execution of the trust  created by this Trust  Agreement and in the exercise and
performance  of any of the powers and duties  under this Trust  Agreement of the
Certificate  Administrator.  The Certificate Administrator shall pay, at its own
cost, any recurring and reasonably  anticipated  expenses incurred in connection
with the performance of its  obligations and duties under this Trust  Agreement,
and shall not be otherwise  entitled to reimbursement for any expenses except as
specifically  provided for in this Trust Agreement.  Upon the termination of the
Certificate Administrator pursuant to Section 5.11, the Trustee shall assume the
duties of the  Certificate  Administrator.  The  Trustee may appoint a successor
Certificate  Administrator  pursuant to the provisions of Section 5.11 and shall
pay, at its own cost,  all expenses  and fees  incurred in  connection  with the
appointment of a successor Certificate Administrator.

     Section 5.11. Termination of Certificate Administrator.

     (a) The Certificate  Administrator  may be removed upon written notice from
the Trustee or the Certificate  Insurer to the Certificate  Administrator if any
of the following events shall occur:

          (i)  the  Certificate  Administrator  shall  default  in any  material
respect in the  performance of its duties under this Trust  Agreement and, after
notice of such  default,  shall not cure  such  default  within 30 days (or four
Business Days, in the case of its  obligations  under  Sections  3.02,  3.07 and
3.10);


<PAGE>

          (ii) a court having  jurisdiction in the premises shall enter a decree
or  order  for  relief  in  respect  of  the  Certificate  Administrator  in any
involuntary  case under any applicable  bankruptcy,  insolvency or other similar
law now or hereafter  in effect,  or appoint a receiver,  liquidator,  assignee,
custodian,  trustee,  sequestrator  (or  similar  official)  of the  Certificate
Administrator  or for  any  substantial  part  of its  property,  or  order  the
winding-up  or  liquidation  of its  affairs and such decree or order shall have
remained in force undischarged or unstayed for a period of 60 days; or

          (iii) the  Certificate  Administrator  shall commence a voluntary case
under  any  applicable  bankruptcy,  insolvency  or  other  similar  law  now or
hereafter in effect,  or shall consent to the entry of an order for relief in an
involuntary  case under any such law, or shall consent to the  appointment of or
taking  possession  by a receiver,  liquidator,  assignee,  trustee,  custodian,
sequestrator (or similar  official) of the Certificate  Administrator or for any
substantial part of its property,  or shall make any general  assignment for the
benefit of  creditors,  or shall fail  generally to pay its debts as they become
due.

     The Certificate Administrator agrees that if any of the events specified in
clauses (ii) or (iii) of this  Section  5.11 shall occur,  it shall give written
notice thereof to the Trustee (with a copy to the  Certificate  Insurer)  within
five Business Days after the  Certificate  Administrator's  actual notice of the
happening of such event.

     (b) The Holders of Certificates evidencing Percentage Interests aggregating
not less than 66-2/3% of each Class of  Certificates  may at any time remove the
Certificate  Administrator  and  appoint a successor  certificate  administrator
acceptable to the Certificate  Insurer by written instrument or instruments,  in
five  copies,  each  signed  by such  Holders  or their  attorneys-in-fact  duly
authorized,  one complete set of which instruments shall be delivered to each of
the Depositor,  the Trustee and the Certificate Insurer, one complete set to the
Certificate  Administrator  so removed and one complete set to the  successor so
appointed.

     (c) No removal or resignation of the Certificate  Administrator pursuant to
this  Section  5.11  shall  be  effective  until  (1)  a  successor  Certificate
Administrator  having a combined  capital  and  surplus of at least  $50,000,000
shall have been  appointed by the Trustee,  and (2) such  successor  Certificate
Administrator  shall  have  agreed in  writing  to be bound by the terms of this
Trust  Agreement in the same manner as the  Certificate  Administrator  is bound
hereunder.

     (d) The Certificate  Administrator  shall  forthwith upon such  termination
deliver to the  successor  Certificate  Administrator,  or if no such  successor
Certificate  Administrator  shall  have  been  appointed,  to the  Trustee,  all
property  and  documents  of the Trust then in the  custody  of the  Certificate
Administrator.  In the event of the  removal  of the  Certificate  Administrator
pursuant to this  Section  5.11 (other than  pursuant to Section  5.11(c)),  the
Certificate  Administrator  shall  cooperate  with  the  Trustee  and  take  all
reasonable  steps requested to assist the Trustee in making an orderly  transfer
of the duties of the Certificate Administrator hereunder.

<PAGE>


                                   ARTICLE VI

                                   The Trustee
                                   -----------

     Section 6.01.  Representation  and Warranties.  The Trustee  represents and
warrants  to  the  Depositor,   the  Certificate  Insurer  and  the  Certificate
Administrator  that this Trust Agreement has been duly executed and delivered by
its  Responsible  Officer who is duly  authorized  to execute  and deliver  such
document in such capacity on its behalf.

     Section 6.02. Directions to the Trustee. The Trustee is hereby directed:

     (a) to accept  assignment of the Mortgage  Certificates  and hold the Trust
Fund in trust for the Certificateholders; and

     (b) to take all other actions as shall be required to be taken by the terms
of this Trust Agreement.

     Section  6.03.  Liability  of the Trustee.  The Trustee  shall be liable in
accordance  herewith only to the extent provided in Section 6.05 and only to the
extent  of the  obligations  specifically  imposed  upon and  undertaken  by the
Trustee herein and no implied  covenants or obligations  shall be read into this
Trust Agreement against the Trustee.

     The Trustee, upon receipt of all certificates, opinions, documents or other
instruments  furnished  to the  Trustee  which are  specifically  required to be
furnished  pursuant to any provision of this Trust  Agreement,  shall  determine
whether  they  are in the  form  required  by this  Trust  Agreement;  provided,
however,  that the Trustee shall not be responsible  for the accuracy or content
of any such certificate,  opinion,  document or other instrument furnished to it
pursuant to this Trust Agreement.

     Section 6.04. Merger or Consolidation of the Trustee. Any Person into which
the  Trustee may be merged or  consolidated,  or any Person  resulting  from any
merger,  conversion or  consolidation  to which the Trustee shall be a party, or
any  Person  succeeding  to all or  substantially  all  of the  corporate  trust
business of the Trustee shall be the successor of the Trustee 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;  provided
that (i) such Person  shall  satisfy the  requirements  for a successor  trustee
specified  in the first  sentence of Section  6.09,  and (ii) the Trustee  shall
deliver an Opinion of Counsel to the Depositor and the Certificate Administrator
to the  effect  that such  merger,  consolidation,  sale or  transfer  shall not
subject the Trust REMIC to federal,  state or local tax or cause the Trust REMIC
to fail to qualify  as a REMIC,  which  Opinion of Counsel  shall be at the sole
expense of the Trustee;  provided however that no such opinion shall be required
upon the  consummation  of the  anticipated  merger of the Trustee with Chemical
Bank.


<PAGE>

     Section  6.05.  Limitation  on  Liability  of the Trustee  and  Others.  In
entering into this Trust Agreement, the Trustee acts solely as trustee hereunder
and not in its individual capacity;  and all persons having any claim under this
Trust  Agreement  or  under  the  Certificates  by  reason  of the  transactions
contemplated   hereby  shall  look  only  to  the  Trust  Fund  for  payment  or
satisfaction  thereof,  subject to this Section  6.05.  The Trustee shall not be
responsible  for the validity or sufficiency of the Mortgage  Certificates,  the
Trust Fund, any assignment or registration, or for any depreciation in the value
of the Trust Fund,  subject to this Section  6.05.  The recitals and  statements
contained  herein  and in the  Certificates  (other  than the  signature  of the
Trustee,  the  authentication  of the  Registrar  on the  Certificates  and  the
representation  and  warranty of the Trustee in Section  6.01) shall be taken as
the statements of the Depositor,  and the Trustee assumes no responsibility  for
the correctness of such recitals and statements.

     Neither the Trustee nor any of the directors, officers, employees or agents
of  the  Trustee  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 Trust  Agreement,  or for errors in
judgment;  provided,  however, that this provision shall not protect the Trustee
or any  such  person  against  liability  for  any  breach  of the  warranty  or
representation  made in Section 6.01 hereof 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 obligations
and duties hereunder. The Trustee and any of its directors,  officers, employees
or  agents  may rely in good  faith on any  document  of any  kind  prima  facie
properly  executed and/or submitted by any Person  respecting any matter arising
hereunder.  The  Trustee  and any  director,  officer,  employee or agent of the
Trustee shall be  indemnified  by the Trust Fund and held  harmless  against any
loss,  liability,  damage,  tax,  claim,  action,  suit or expense  incurred by,
imposed on or asserted against the Trustee in any way relating to or arising out
of this Trust  Agreement,  the  administration  of the Trust Fund, the action or
inaction  of  the  Trustee  hereunder,  or  in  connection  with  investigating,
preparing or defending any legal action,  commenced or  threatened,  relating to
this  Trust  Agreement  or the  Mortgage  Certificates,  other  than  any  loss,
liability,  damage,  tax, claim,  action,  suit or expense incurred by reason of
willful  misfeasance,  bad  faith or  negligence  in the  performance  of duties
hereunder  or  by  reason  of  reckless  disregard  of  obligations  and  duties
hereunder. The Trustee shall not be under any obligation to appear in, prosecute
or defend any legal action except in connection  with the Mortgage  Certificates
under the circumstances  described in Section 3.01; provided,  however, that the
Trustee shall at the request of Holders of  Certificates  evidencing  Percentage
Interests  aggregating not less than 66-2/3% of each Class of Certificates or at
the request of the Certificate Insurer undertake any such legal action which the
Certificateholders  making such request shall specify with respect to this Trust
Agreement  and the rights and duties of the parties  hereto and the interests of
the Certificateholders  hereunder.  In such event the legal fees and expenses of
such action and any liability therefrom shall be borne by  Certificateholders or
the Certificate  Insurer, as applicable,  pursuant to the indemnity furnished by
them or it as a precondition to the Trustee's obligation to take any such action
pursuant to any such request.

     Section  6.06.  Delegation  of Duty by the  Trustee.  In  carrying  out its
obligations  under this Trust Agreement,  the Trustee may act either directly or
through agents, attorneys, accountants, independent contractors and auditors and
enter into  agreements  with any of them and shall not be liable for the default
or  misconduct  of  any  such  agents,   attorneys,   accountants,   independent
contractors  or auditors if such  agents,  attorneys,  accountants,  independent
contractors or auditors shall have been selected with reasonable care.


<PAGE>

     The  Trustee  shall  have no  duty  to  oversee,  investigate  or make  any
determination  with respect to the  administration of the trust funds related to
any of the Underlying Series.

     Furthermore,  the Trustee shall not,  except as to any fact or matter as to
which notice has been given generally to the holders of other securities  issued
by an issuer of one of the Underlying Series ("Other Securities"),  be under any
obligation to disclose to the Certificateholders any fact or matter with respect
to such issuer or Other Securities that the Trustee acquires as trustee for such
Other  Securities.  At the same  time  that it acts as  Trustee  hereunder,  the
Trustee  may,  provided  that it  maintains  customary  separation  between  the
department  administering  the trusts  established and those in its employ which
may make, or give advice with respect to, investment  decisions,  invest for its
own  account,  or  advise  others  with  respect  to their  investments,  in the
Certificates and in Underlying Series.

     Section 6.07. Trustee's Fees. (a) The Certificate  Administrator  covenants
and  agrees  to pay to the  Trustee,  and the  Trustee  shall  be  entitled  to,
reasonable  compensation  (which shall not be limited by any provision of law in
regard to the compensation of a trustee of an express trust) for all services to
be rendered by it in the execution of the trust created by this Trust  Agreement
and in the exercise and  performance  of any of the powers and duties under this
Trust  Agreement of the  Trustee.  The Trustee  shall pay, at its own cost,  any
recurring and reasonably  anticipated  expenses  incurred in connection with the
performance of its obligations and duties under this Trust Agreement,  and shall
not  be  otherwise   entitled  to  reimbursement  for  any  expenses  except  as
specifically  provided for in this Trust Agreement.  Upon the termination of the
Trustee pursuant to Section 6.08, the Certificate  Administrator shall appoint a
successor  Trustee  pursuant to Section 6.09 and shall pay, at its own cost, all
expenses and fees,  incurred in connection  with the  appointment of a successor
Trustee.   The  Certificate   Administrator  shall  have  a  claim  against  the
predecessor Trustee for all costs, expenses and fees incurred by the Certificate
Administrator pursuant to the appointment of a Successor Trustee.

     (b) Except as provided  above,  no provision of this Trust  Agreement or of
the  Certificates  shall  require the Trustee to expend or risk its own funds or
otherwise incur any financial  liability in the performance of any of its duties
hereunder or thereunder,  or in the exercise of any of its rights or powers,  if
it shall have  reasonable  grounds for believing that repayment of such funds or
adequate  indemnity against such risk or liability is not reasonably  assured to
it.

     Section 6.08.  Resignation and Removal of the Trustee.  (a) The Trustee may
at any time resign and be discharged  from the trusts  hereby  created by giving
written  notice  thereof  to the  Depositor,  the  Certificate  Insurer  and the
Certificate  Administrator.  Upon  receiving  such  notice of  resignation,  the
Certificate  Administrator shall promptly appoint a successor trustee by written
instrument, in quadruplicate, one copy of which instrument shall be delivered to
the  resigning  Trustee,  one  copy to the  successor  trustee,  one copy to the
Certificate Insurer and one copy to 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,  the  resigning  Trustee may petition any
court of competent jurisdiction for the appointment of a successor trustee.


<PAGE>

     (b) If at any time the Trustee shall become  incapable of acting,  or shall
file a petition to take  advantage of any applicable  insolvency,  bankruptcy or
reorganization  statute,  or a receiver or  conservator 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,
conservation or liquidation,  then the Depositor or the Certificate  Insurer may
remove the Trustee and appoint a  successor  trustee by written  instrument,  in
triplicate,  one copy of which  instrument shall be delivered to the Certificate
Insurer, the Trustee so removed and the successor trustee.

     (c) The Holders of Certificates evidencing Percentage Interests aggregating
not less than 66-2/3% of each Class of  Certificates  may at any time remove the
Trustee and appoint a successor trustee acceptable to the Certificate Insurer by
written instrument or instruments,  in five copies,  each signed by such Holders
or  their   attorneys-in-fact  duly  authorized,   one  complete  set  of  which
instruments  shall  be  delivered  to each  of the  Depositor,  the  Certificate
Insurer, and the Certificate  Administrator,  one complete set to the Trustee so
removed and one complete set to the successor so appointed.

     (d)  Any  resignation  or  removal  of the  Trustee  and  appointment  of a
successor  trustee  pursuant to any of the provisions of this Section 6.08 shall
become  effective upon  acceptance of  appointment  by the successor  trustee as
provided in Section 6.09 hereof.

     Section  6.09.  Successor  Trustee.  Any  successor  trustee  appointed  as
provided  in  Section  6.08  hereof  shall  be a bank,  trust  company  or other
fiduciary authorized to administer trusts,  subject to regulation or supervision
by federal or state  authority  and having a combined  capital and surplus of at
least $50,000,000 and be acceptable to the Certificate  Administrator.  Any such
successor trustee shall execute,  acknowledge and deliver to the Depositor,  the
Certificate  Administrator,  the  Certificate  Insurer  and to  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 like  effect  as if  originally  named as  Trustee
herein.  The  predecessor  Trustee shall  transfer to the successor  trustee the
Mortgage  Certificates and shall turn over all related  documents and statements
held hereunder.  In addition,  the predecessor  Trustee and, upon request of the
successor trustee, the Depositor, 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 such rights,  powers, duties
and obligations.


<PAGE>

     Upon  acceptance of appointment by a successor  trustee as provided in this
Section,  the Certificate  Administrator  shall mail notice of the succession of
such Trustee  hereunder to each Rating Agency and to all Holders of Certificates
at their addresses as shown in the Certificate  Register. If the Depositor fails
to mail such  notice  within 10 days  after  acceptance  of  appointment  by the
successor trustee, the successor trustee shall cause such notice to be mailed at
the expense of the Depositor.

     No Trustee  hereunder shall be personally liable hereunder by reason of any
act or failure to act of any predecessor or successor trustee hereunder.

     Section 6.10.  Compliance with REMIC  Provisions.  The Trustee shall at all
times (a) use its best  efforts to conduct the affairs of the Trust at all times
that any Class of  Certificates  is  outstanding so as to maintain the status of
the Trust  REMIC as a REMIC under the REMIC  Provisions;  (b) 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  REMIC or that would  subject the
Trust REMIC to tax;  (c) exercise  reasonable  care not to allow the creation of
any "interests" in the Trust REMIC within the meaning of Code Section 860D(a)(2)
other  than  the  interests  represented  by  the  Certificates;   (d)  exercise
reasonable  care not to allow  the  occurrence  of any  Prohibited  Transaction,
unless the Certificate  Administrator  shall have provided an Opinion of Counsel
to the  Trustee  that  such  occurrence  would not (i)  result  in a gain,  (ii)
otherwise subject the Trust REMIC to tax, or (iii) cause the Trust REMIC to fail
to qualify as a REMIC;  (e) exercise  reasonable care not to accept the transfer
of any assets to the Trust after the  Startup  Day that would  subject the Trust
REMIC to the 100% tax on  certain  contributions  after the  Startup  Day of the
Trust REMIC pursuant to Code Section 860G(d);  and (f) exercise  reasonable care
not to allow the Trust REMIC to receive income from the  performance of services
or from assets not permitted  under the REMIC  Provisions to be held by a REMIC.
The Trustee  agrees to sign the federal  and,  if  applicable,  state and local,
income tax or information  returns or reports of the Trust REMIC prepared by the
Certificate Administrator pursuant to Section 5.03.

     Section  6.11.  Opposition  of  Recharacterization.  In the event  that the
Federal Deposit  Insurance  Corporation or another similar  government entity is
appointed  as  receiver or  conservator  for Norwest  Bank  Minnesota,  National
Association,  and in  connection  therewith  an  attempt  is made to  treat  the
Mortgage Certificates as property of the receivership or conservatorship  estate
of Norwest Bank  Minnesota,  National  Association,  the Trustee shall  actively
oppose any such attempt. The Trustee shall be entitled to reimbursement from the
assets  of the Trust  Fund for any  expenses  incurred  in  complying  with this
Section 6.11.

<PAGE>


                                   ARTICLE VII

                                   Termination
                                   -----------

     Section 7.01.  Termination Upon  Distribution to  Certificateholders.  This
Trust  Agreement and the  respective  obligations  and  responsibilities  of the
Depositor,  the Certificate  Administrator  and the Trustee created hereby shall
terminate upon the earlier of (i) the  Distribution  Date following the purchase
by the Tax Beneficial Holder of all Mortgage Certificates remaining in the Trust
Fund at a price equal to 100% of the Mortgage  Certificate  Principal Balance of
each Mortgage Certificate,  plus any accrued and unpaid interest on the Mortgage
Certificates  through the  Underlying  Series  Distribution  Date preceding such
Distribution  Date  at the  applicable  Weighted  Average  Mortgage  Certificate
Pass-Through  Rate (such  payment by the Tax  Beneficial  Holder,  the "Clean-Up
Payment"),  (ii) the final distribution to  Certificateholders,  the Certificate
Administrator,  the Certificate  Insurer and the Trustee of all amounts required
to be distributed  pursuant to Article III and (iii) following the  distribution
of all amounts  pursuant to clauses (i) and (ii) above,  the distribution of all
the  remaining  amounts  and  property  of the Trust Fund to the Tax  Beneficial
Holder;  provided,  however,  that in no event  shall the trust  created  hereby
continue beyond the expiration of 21 years from the death of the survivor of the
descendants  of Joseph P. Kennedy,  the late  ambassador of the United States to
the Court of St. James's, living on the date hereof.

     The  right  of  the  Tax   Beneficial   Holder  to  purchase  the  Mortgage
Certificates  pursuant to clause (i) of the preceding  paragraph is  conditioned
upon the Aggregate Mortgage Certificate Principal Balance being equal to or less
than  5% of  the  aggregate  of  the  Original  Mortgage  Certificate  Principal
Balances.

     Notice of any termination specifying the Final Distribution Date upon which
the  Certificateholders  may surrender  their  Certificates  to the  Certificate
Administrator  for payment of the final  distribution and cancellation  shall be
given promptly by the Certificate  Administrator by letter to Certificateholders
mailed  not  earlier  than the first day and not later  than the 18th day of the
month of such final distribution specifying (A) the Distribution Date upon which
the final  distribution on the Certificates  shall be made upon presentation and
surrender of Certificates at the office of the Certificate Administrator therein
designated,  (B) the  amount  of any such  final  distribution  and (C) that the
Record Date otherwise  applicable to such  Distribution  Date is not applicable,
distributions   being  made  only  upon   presentation   and  surrender  of  the
Certificates at the office of the Certificate  Administrator  therein specified;
provided,  however,  that the failure to give such notice  shall not entitle any
Certificateholder to receive any interest in excess of such  Certificateholder's
Percentage  Interest of the allocation of such Class's  Interest  Accrual Amount
for  such  Final  Distribution  Date.  Upon  presentation  and  surrender  of  a
Certificate,  the Certificate Administrator shall cause to be distributed to the
Holder thereof such Holder's final distribution.


<PAGE>

     Section 7.02. Failure of Certificateholders to Surrender  Certificates.  In
the  event  that  any  of  the  Certificateholders  shall  not  surrender  their
Certificates  for  cancellation  within six months after the Final  Distribution
Date, the Certificate Administrator shall give a written notice to the remaining
Certificateholders  to surrender their Certificates for cancellation and receive
the final  distribution  with  respect  thereto.  If within  one year after such
notice all the Certificates  shall not have been  surrendered for  cancellation,
the  Certificate  Administrator  may take  appropriate  steps, or may appoint an
agent to take  appropriate  steps,  to contact the remaining  Certificateholders
concerning  surrender of their Certificates,  and the cost thereof shall be paid
out of the funds and other assets which  remain  subject to the Trust Fund.  Any
funds  which are  payable to  Certificateholders  remaining  in the Trust  after
exhaustion  of  such  remedies   shall  be   distributed   by  the   Certificate
Administrator to National Diabetes Foundation (but only upon termination of this
Agreement)  and the  Certificateholders,  by acceptance  of their  Certificates,
hereby waive any rights with respect to such funds.

     Section  7.03.  Additional  Termination  Requirements.  In the  event  of a
mandatory  auction  as  provided  in  Section  3.07 or in the event that the Tax
Beneficial Holder purchases the Mortgage  Certificates pursuant to Section 7.01,
the Trust REMIC shall be terminated in accordance with the following  additional
requirements, provided that the termination of the Trust REMIC will constitute a
"qualified  liquidation"  of the  REMIC  within  the  meaning  of  Code  Section
860F(a)(4)(A)  and will not subject the REMIC to tax or cause the Trust REMIC to
fail to qualify as a REMIC at any time that any Certificates are outstanding:

          (i) the  Trustee  shall adopt a plan of  complete  liquidation  of the
     REMIC.  The Trustee shall also specify the date of the adoption of the plan
     in a statement attached to the final tax return of the REMIC; and

          (ii) within 90 days of adoption of such a plan of complete liquidation
     and at or prior to the Final  Distribution Date, the Trustee shall sell all
     of the assets of the Trust REMIC for cash at the purchase  price  specified
     in  Section  3.07 or 7.01 and  shall  distribute  such  cash in the  manner
     specified in Section 3.07 or 7.01.

<PAGE>


                                  ARTICLE VIII

                     The Policy and the Certificate Insurer
                     --------------------------------------

     Section  8.01.  Maintenance  of the  Policy;  Collections  Thereunder.  The
Certificate  Administrator  shall exercise its best efforts to maintain and keep
the Policy in full force and effect  until the  payment in full of the Class A-1
Certificates.

     The  Certificate  Administrator  shall present  claim(s) to the Certificate
Insurer in  accordance  with  Section  3.10 hereof and this Article VIII and the
terms of the Policy, and, in this regard,  shall take all such reasonable action
as shall be necessary to permit recovery under the Policy. Any amounts collected
pursuant thereto shall be deposited in the Guaranty Payment Account.

     Section 8.02.  Certificate  Insurer's Direction of Insolvency  Proceedings.
The Trustee, immediately upon receipt of written notice of a Responsible Officer
thereof,  shall notify the  Certificate  Insurer of (i) the  commencement of any
voluntary or involuntary bankruptcy or insolvency proceedings (individually,  an
"Insolvency  Proceeding")  involving the issuer of the Mortgage  Certificates or
any related  mortgagor and (ii) the  presentment of any claim in connection with
any insolvency  proceeding  seeking the avoidance as a preferential  transfer (a
"Preference  Claim") of any payment of principal  of, or interest on, a Mortgage
Certificate.  Each Holder, by its purchase of any of the  Certificates,  and the
Trustee  hereby agree that,  so long as neither a  Certificate  Insurer  Default
under the  Policy nor a  Certificate  Insurer  Insolvency  has  occurred  and is
continuing,  the Certificate  Insurer may at any time during the continuation of
an  Insolvency  Proceeding  direct  all  matters  relating  to  such  Insolvency
Proceeding,  including,  without  limitation,  (i) all  matters  relating to any
Preference Claims, (ii) the direction of any appeal of any order relating to any
Preference Claim and (iii) the posting of any surety, supersedeas or performance
bond  pending any such  appeal.  To the extent of such  Preference  Claims,  the
Certificate  Insurer  shall be  subrogated to the rights of the Trustee and each
Holder in the  conduct of any such  Insolvency  Proceeding,  including,  without
limitation,  all rights of any party to an adversarial proceeding or action with
respect  to any  court  order  issued  in  connection  with any such  Insolvency
Proceeding.  In connection with any Preference Claim made upon the Trustee,  the
Trustee  shall,  as and when it deems  necessary and  appropriate to protect the
interests of the Holders and in accordance  with the Policy,  make a claim under
the Policy for the amount of such Preference  Claim in accordance with all terms
and conditions of the Policy.

     Section 8.03.  Certificate  Insurer Deemed Holder. For all purposes of this
Agreement (excluding Section 3.07(a),  Section 5.11(b), and Section 6.08(c)), so
long as no Certificate  Insurer  Default or Certificate  Insurer  Insolvency has
occurred and is continuing,  the Certificate  Insurer shall be deemed the Holder
of the Class A-1  Certificates  for purposes of directing  the taking of actions
and the  enforcement of remedies  permitted by this  Agreement.  As such and for
such  purposes,  the  Certificate  Insurer may take all actions  permitted to be
taken by the Holders of the Class A-1 Certificates  (excluding any vote pursuant
to Section 3.07(a) and any actions pursuant to Sections 5.11(b) and 6.08(c)), to
the  exclusion of the actual  Holders of the Class A-1  Certificates,  as if the
Certificate   Insurer  were  in  fact  the  actual   Holder  of  all  Class  A-1
Certificates.  Any successor  Certificate  Administrator or Trustee appointed by
the Holders pursuant to Section 5.11 or Section 6.09 hereof, respectively,  must
have been  previously  approved by the  Certificate  Insurer in  writing,  which
approval shall not be unreasonably withheld.


<PAGE>

     The  Certificate  Insurer  shall  also be  deemed a Holder  (but not to the
exclusion of the actual Holders) for the purposes of Section 3.04(a) and (b) and
shall be entitled to receive the notices described therein.

     Section 8.04.  Termination of Certificate  Insurer's Rights.  All rights of
the  Certificate  Insurer under this  Agreement  shall exist only so long as the
Policy  remains  in effect  and the  Certificate  Insurer  shall have no further
rights hereunder upon (i) the termination of the Policy or (ii) a default by the
Certificate  Insurer on its  obligations  under the Policy which remains uncured
for a period of at least 45 days (such  rights to be  restored  upon the cure of
such default).

<PAGE>


                                   ARTICLE IX

                            Miscellaneous Provisions
                            ------------------------

     Section 9.01.  Amendment.  This Trust Agreement may be amended from time to
time by the Trustee, the Certificate  Administrator,  the Depositor and, only to
the extent  that any such  amendment  affects the Tax  Beneficial  Holder or the
Certificate  Insurer,  the Tax Beneficial Holder or the Certificate  Insurer, as
the case may be, but without the consent of any of the  Certificateholders,  (i)
to cure any ambiguity or mistake,  (ii) to correct or  supplement  any provision
herein  which may be  inconsistent  with any other  provision  herein,  (iii) to
maintain  the  qualification  of the Trust REMIC as a REMIC or prevent the Trust
REMIC from entering into any Prohibited  Transaction,  (iv) to change the timing
and/or nature of deposits into the  Certificate  Account  provided that (a) such
change shall not, as evidenced by an Opinion of Counsel, adversely affect in any
material  respect the  interests  of any  Certificateholder  and (b) such change
shall not  adversely  affect the  then-current  rating of the  Certificates,  as
evidenced by a letter from each Rating Agency to such effect, or (v) to add such
other  provisions with respect to matters or questions  arising under this Trust
Agreement  that shall not be materially  inconsistent  with other  provisions of
this Trust Agreement; provided, with respect to clauses (iv) and (v) above, that
such action shall not, as evidenced by an Opinion of Counsel,  adversely  affect
in any  material  respect the  interests  of any  Certificateholder.  This Trust
Agreement  may also be  amended  from  time to time,  subject  to the  following
sentence, by the Trustee, the Certificate Administrator, the Depositor and, only
to the extent that any such amendment  affects the Tax Beneficial  Holder or the
Certificate  Insurer,  the Tax Beneficial Holder or the Certificate  Insurer, as
the case may be,  with the  consent of the  Holders of  Certificates  evidencing
Percentage  Interests  aggregating  not  less  than  66-2/3%  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  Trust
Agreement or modifying in any manner the rights of the Holders of  Certificates;
provided,  however,  that no such  amendment  shall (i) reduce in any manner the
amount of, or delay the timing of,  amounts  required to be  distributed  on any
Certificate  without the consent of the Holder of such Certificate,  (ii) reduce
the aforesaid  percentage of the Certificates of each Class the Holders of which
are required to consent to any such amendment without the consent of the Holders
of all Certificates  then-outstanding or (iii) permit the removal of the Trustee
or the Certificate  Administrator  without cause. The Certificate  Administrator
shall give notice of any proposed amendment hereto to the Certificate Insurer at
least five Business Days prior to the adoption thereof.

     Notwithstanding any contrary provision of this Trust Agreement, the Trustee
shall not consent to any amendment to this Trust Agreement  unless it shall have
first received an Opinion of Counsel to the effect that such amendment shall not
subject  the Trust REMIC to tax or cause the Trust REMIC to fail to qualify as a
REMIC at any time that any Certificates are outstanding.


<PAGE>

     Promptly  after the  execution  of any  amendment  to this Trust  Agreement
requiring the consent of Certificateholders, the Certificate Administrator shall
furnish a copy of such  amendment to each  Certificateholder,  the Trustee,  the
Certificate Insurer and to the Rating Agency.

     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 Certificate Administrator may prescribe.

     Section  9.02.  Limitation  on Rights of  Certificateholders.  The death or
incapacity of any  Certificateholder  shall not operate to terminate  this Trust
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,  or
otherwise  affect the rights,  obligations and liabilities of any of the parties
hereto.

     No  Certificateholder  shall have any right to vote  (except as provided in
Section  9.01 or this  Section  9.02) 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 person by reason of any
action taken by the parties to this Trust  Agreement  pursuant to any  provision
hereof.

     Except in the case of an action,  suit or  proceeding  against  the Trustee
with  respect to a breach or alleged  breach of its duties and  responsibilities
hereunder, no Certificateholder shall have any right by virtue of any provisions
of this Trust Agreement to institute any action, suit or proceeding in equity or
at law upon or under or with respect to this Trust Agreement  unless such Holder
previously shall have given to the Trustee a written notice of the basis of such
action, suit or proceeding, the Certificate Insurer shall have consented to such
proceeding  (so long as no  Certificate  Insurer  Default  has  occurred  and is
continuing)  and  unless  the  Holders  of  Certificates  evidencing  Percentage
Interests  aggregating not less than 51% of the same Class of Certificates 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 being
understood   and   intended,    and   being   expressly   covenanted   by   each
Certificateholder with every other Holder of a Certificate 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 Trust  Agreement to affect,  disturb
or prejudice the rights of the Holders of any other of such Certificates,  or to
obtain or seek to obtain priority over or preference to any other such Holder of
Certificates, or to enforce any right under this Agreement, except in the manner
herein provided and for the equal,  ratable and common benefit of all Holders of
Certificates.  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.


<PAGE>

     Section 9.03. Limitation on Liability of the Depositor and Others.  Neither
the Depositor nor any of its directors,  officers,  employees or agents shall be
under any liability to the Trust or Certificateholders  for any action taken, or
for  refraining  from the taking of any action,  in good faith  pursuant to this
Trust  Agreement,  or for  errors  in  judgment;  provided,  however,  that this
provision  shall not protect the Depositor or any other such person  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 obligations and duties hereunder.  The Depositor and its directors,
officers, employees or agents may rely in good faith on any document of any kind
prima facie  properly  executed  and/or  submitted by any Person  respecting any
matter arising hereunder.

     Section  9.04.   Governing  Law.  THIS  AGREEMENT  SHALL  BE  CONSTRUED  IN
ACCORDANCE  WITH THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO AGREEMENTS MADE
AND TO BE PERFORMED IN THE STATE OF NEW YORK,  AND THE  OBLIGATIONS,  RIGHTS AND
REMEDIES OF THE PARTIES HERETO AND THE CERTIFICATEHOLDERS SHALL BE DETERMINED IN
ACCORDANCE WITH SUCH LAWS.

     Section 9.05. Notices.  All demands,  notices and communications  hereunder
shall be in writing  and shall be deemed to have been duly given when  delivered
at (a) in the case of the  Depositor,  to CS First  Boston  Mortgage  Securities
Corp.,  Park Avenue Plaza, 55 East 52nd Street,  New York, New York 10055, or to
such other address as may hereafter be furnished to the other parties  hereto in
writing by the Depositor;  (b) in the case of the Trustee,  The Chase  Manhattan
Bank (National  Association) at 4 Chase MetroTech Center,  3rd Floor,  Brooklyn,
New  York  11245,  Attention:  Global  Trust  Services,  (c) in the  case of the
Certificate Administrator, at the Corporate Trust Office; (d) in the case of the
Tax Beneficial Holder, Norwest Corporation,  Attention:  Banking Group Treasury,
with a copy to Norwest Corporation,  Law Department, Attn: Secretary; (e) in the
case of the Certificate Insurer,  MBIA Insurance  Corporation,  113 King Street,
Armonk,  New York 10504,  Attention:  Insured Portfolio  Management,  Structured
Finance;  or to such other  address as may  hereafter  be furnished to the other
parties  hereto in writing.  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 to a Holder within the time  prescribed in this Trust  Agreement shall be
conclusively   presumed   to  have  been   duly   given   whether   or  not  the
Certificateholder  receives such notice. Any notice mailed to the Trustee or the
Certificate Administrator shall be effective only upon receipt.

     Section  9.06.  Severability  of  Provisions.  If any  one or  more  of the
covenants, agreements,  provisions or terms of this Trust 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  Trust  Agreement  and shall in no way  affect  the
validity or enforceability of the other provisions of this Trust Agreement or of
the Certificates or the rights of the Holders thereof.


<PAGE>

     Section  9.07.  Certificates  Nonassessable  and  Fully  Paid.  It  is  the
intention of this  Agreement  that  Certificateholders  shall not be  personally
liable for  obligations of the Trust,  that the beneficial  ownership  interests
represented  by the  Certificates  shall  be  nonassessable  for any  losses  or
expenses of the Trust or for any reason  whatsoever,  and that Certificates upon
execution,  authentication and delivery thereof by the Certificate Administrator
pursuant to Section 2.02 are and shall be deemed fully paid.

     Section 9.08. Execution in Counterparts.  This Agreement may be executed in
one or more  counterparts,  all of which  shall be  considered  one and the same
agreement,  and shall become a binding  agreement when one or more  counterparts
have been signed by each party and delivered to the other party.

     Section  9.09.  Special  Notices to the Rating  Agencies.  The  Certificate
Administrator  shall  give  prompt  notice  to  each  Rating  Agency  and to the
Certificate Insurer of the occurrence of any of the following events:

     (i) any amendment to this Agreement pursuant to Section 9.01;

     (ii) the making of a final payment pursuant to Section 7.01;

     (iii) the  resignation or removal of the Trustee  pursuant to Section 6.08;
and

     (iv) the appointment of a successor trustee pursuant to Section 6.09.



<PAGE>


     IN WITNESS  WHEREOF,  the Depositor,  the  Certificate  Administrator,  the
Trustee  and the Tax  Beneficial  Holder  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.

                                      CS FIRST BOSTON MORTGAGE SECURITIES 
                                      CORP., as Depositor

                                      By: /s/ Gina Hubbell
                                          Name:  Gina Hubbell
                                          Title: Vice President

                                      NORWEST BANK MINNESOTA, NATIONAL 
                                      ASSOCIATION, as Certificate Administrator

                                      By: /s/ Patrick G. Bassett
                                          Name:  Patrick G. Bassett
                                          Title: Vice President

                                      THE CHASE MANHATTAN BANK 
                                      (NATIONAL ASSOCIATION),
                                      as Trustee

                                      By: /s/ Thomas J. Provenzano
                                          Name:  Thomas J. Provenzano
                                          Title: Vice President

                                      NORWEST CORPORATION, as Tax Beneficial 
                                      Holder

                                      By: /s/ Charles D. White
                                          Name:  Charles D. White
                                          Title: Senior Vice President and 
                                                 Treasurer

<PAGE>

STATE OF NEW YORK )
                   ss.:
COUNTY OF NEW YORK)

     On this --- day of May,  1996,  before  me, a notary  public in and for the
State of New York, personally appeared  ---------------,  known to me who, being
by me duly  sworn,  did depose and say that he/she  resides at  ---------------,
- -------------;  that  he/she  is the  --------------------  of CS  First  Boston
Mortgage  Securities  Corp.,  a Delaware  corporation,  one of the parties  that
executed the foregoing  instrument;  and that he/she signed his/her name thereto
by order of the Board of Directors of said association.


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




[NOTARIAL SEAL]



<PAGE>



STATE OF NEW YORK )
                   ss.:
COUNTY OF NEW YORK)

     On this --- day of May,  1996,  before  me, a notary  public in and for the
State of New York, personally appeared  ---------------,  known to me who, being
by me duly  sworn,  did  depose  and say that  he/she  resides  at  -----------,
- --------------;  that he/she is the  --------------  of The Chase Manhattan Bank
(National Association),  a national banking association, one of the parties that
executed the foregoing  instrument;  and that he/she signed his/her name thereto
by order of the Board of Directors of said association.


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




[NOTARIAL SEAL]

<PAGE>



STATE OF NEW YORK )
                   ss.:
COUNTY OF NEW YORK)

     On this --- day of May,  1996,  before  me, a notary  public in and for the
State of New York, personally appeared  ---------------,  known to me who, being
by me duly  sworn,  did depose  and say that  he/she  resides  at  ------------,
- --------------;  that he/she is the  -------------  of Norwest  Bank  Minnesota,
National  Association,  a national banking association,  one of the parties that
executed the foregoing  instrument;  and that he/she signed his/her name thereto
by order of the Board of Directors of said association.


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




[NOTARIAL SEAL]



<PAGE>



STATE OF NEW YORK )
                   ss.:
COUNTY OF NEW YORK)

     On this --- day of May,  1996,  before  me, a notary  public in and for the
State of New York, personally appeared ----------------,  known to me who, being
by me duly  sworn,  did depose  and say that  he/she  resides  at  ------------,
- ------------;  that he/she is the ----------- of Norwest Corporation, a Delaware
corporation, one of the parties that executed the foregoing instrument; and that
he/she  signed  his/her  name thereto by order of the Board of Directors of said
association.


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




[NOTARIAL SEAL]



<PAGE>

                                   SCHEDULE I

                              Mortgage Certificates
                              ---------------------

                                      Principal      Principal
                                     Balance as       Balance
                        Classes of   of the Cut-     as of the        Original
 Series Designation    Certificates   Off Date      Closing Date       Balance
 ------------------    ------------   --------      ------------       -------
                      
     Series 1991-5         A-1       28,115,661     27,538,996.83     93,500,000
     Series 1991-15        A-3       13,444,979     13,346,843.83     18,875,000
     Series 1992-9         B-4       10,383,476     10,383,525.01     10,379,000
     Series 1992-10        A-1       10,938,727     10,663,654.88     39,000,000
     Series 1992-11       A-1C       42,227,618     41,558,730.38     80,251,000
     Series 1992-12       A-2D       73,753,000     73,753,000.00     73,753,000
     Series 1992-14        A-3       17,415,030     17,415,030.48     17,415,000
     Series 1992-15       A-2C       48,734,257     47,246,922.67    153,849,000
     Series 1992-16       A-2C       32,861,000     32,861,000.00     32,861,000
     Series 1992-18P       A-3        3,798,013      3,310,953.94     10,000,000
     Series 1993-3        A-2B        4,013,526      3,806,060.37      5,750,000
     Series 1993-3        A-2C       18,885,000     18,885,000.00     18,885,000
     Series 1993-3         B-7        1,009,940        990,110.76      3,214,000


<PAGE>


                                    EXHIBIT A
                     [FORM OF FACE OF CLASS A-1 CERTIFICATE]


     UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY,  A NEW YORK CORPORATION  ("DTC"),  TO THE REGISTRAR OR
ITS AGENT FOR REGISTRATION OF TRANSFER, EXCHANGE OR PAYMENT, AND ANY CERTIFICATE
ISSUED IS  REGISTERED  IN THE NAME OF CEDE & CO. OR SUCH OTHER NAME AS REQUESTED
BY AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR
TO SUCH OTHER ENTITY AS IS REQUESTED BY AN  AUTHORIZED  REPRESENTATIVE  OF DTC),
ANY  TRANSFER,  PLEDGE OR OTHER USE HEREOF FOR VALUE OR  OTHERWISE  BY OR TO ANY
PERSON IS WRONGFUL  INASMUCH AS THE REGISTERED OWNER HEREOF,  CEDE & CO., HAS AN
INTEREST HEREIN.

THIS  CERTIFICATE  CONSTITUTES  BOTH A  "REGULAR  INTEREST"  IN A  "REAL  ESTATE
MORTGAGE  INVESTMENT  CONDUIT" AS THOSE TERMS ARE DEFINED IN SECTION  860G(a)(1)
AND  SECTION  860D,  RESPECTIVELY,  OF THE  INTERNAL  REVENUE  CODE OF 1986,  AS
AMENDED, AND A CONTRACTUAL RIGHT TO RECEIVE AMOUNTS FROM THE RESERVE FUND.


<PAGE>


                          ADJUSTABLE RATE CERTIFICATE,
                                  SERIES 1996-1
                                    CLASS A-1

evidencing a beneficial  ownership  interest in a trust  consisting  of mortgage
pass-through certificates


                    CS FIRST BOSTON MORTGAGE SECURITIES CORP.
               (Not an interest in or obligation of the Depositor)

     THIS CERTIFICATE DOES NOT EVIDENCE AN OBLIGATION OF, OR AN INTEREST IN, THE
DEPOSITOR,  THE  CERTIFICATE   ADMINISTRATOR,   THE  TRUSTEE  OR  ANY  OF  THEIR
AFFILIATES,  AND IS NOT INSURED OR GUARANTEED BY THE DEPOSITOR,  THE CERTIFICATE
ADMINISTRATOR,  THE  TRUSTEE OR ANY OF THEIR  AFFILIATES,  OR BY ANY  GOVERNMENT
AGENCY.  DISTRIBUTIONS IN REDUCTION OF THE PRINCIPAL BALANCE OF THIS CERTIFICATE
SHALL BE MADE IN THE MANNER  DESCRIBED  IN THE  AGREEMENT  (AS DEFINED  HEREIN).
ACCORDINGLY THE OUTSTANDING  PRINCIPAL  BALANCE OF THIS  CERTIFICATE AT ANY TIME
MAY BE LESS THAN THE INITIAL PRINCIPAL BALANCE REPRESENTED HEREBY.

Certificate No.  -----                  Cut-off Date: April 28, 1996

Percentage Interest evidenced           First Distribution Date:  July 29, 1996
by this Certificate:  [   ]%

Denomination:  $[   ].                  CUSIP No.:  126342D -------



<PAGE>



     THIS CERTIFIES THAT ------------------------------------- is the registered
owner of the  Percentage  Interest  evidenced  by this  Certificate  in  monthly
distributions  to the Holders of the Class A-1  Certificates  with  respect to a
Trust consisting primarily of mortgage pass-through  certificates (the "Mortgage
Certificates"),  formed  by CS  First  Boston  Mortgage  Securities  Corp.  (the
"Depositor",  which term  includes  any  successor  entity  under the  Agreement
referred to below). The Trust was created pursuant to a Pooling Trust Agreement,
dated as of May 31, 1996 (the  "Agreement"),  among the Depositor,  Norwest Bank
Minnesota,  National Association, as certificate administrator (the "Certificate
Administrator"),  The Chase  Manhattan Bank (National  Association),  as trustee
(the "Trustee"), and Norwest Corporation, as tax beneficial holder, a summary of
certain of the pertinent  provisions of which is set forth below.  To the extent
not defined herein, the capitalized terms used herein have the meanings ascribed
to such terms in the Agreement.  This Certificate is issued under and is subject
to the terms, provisions and conditions of the Agreement, to which 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 Agreement, a distribution shall be made on the
28th day of each  January,  April,  July and  October  or,  if such day is not a
Business  Day,  the  following  Business  Day  (each,  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 last
Business Day of the month preceding the month of such  distribution (the "Record
Date"), in an amount equal to the product of the Percentage  Interest  evidenced
by this  Certificate and the amount  distributable  pursuant to the Agreement on
the Class A-1 Certificates for such Distribution Date, subject to adjustment, in
certain  events,   as  specified  in  the  Agreement.   Distributions   on  each
Distribution  Date  shall be  allocated  among the  Classes of  Certificates  in
accordance  with the provisions of the  Agreement.  The amount of interest which
accrues on this  Certificate  in any month  shall be subject to  reduction  with
respect to any Mortgage  Certificate  Prepayment Interest Shortfall and Deferred
Interest, as described in the Agreement.

     Distributions  on  this  Certificate  shall  be  made  by  the  Certificate
Administrator by check mailed to the address of the Person entitled thereto,  as
such name and  address  shall  appear on the  Certificate  Register  unless such
Person holds Class A-1  Certificates  having in the aggregate a denomination  of
$5,000,000  or more and notifies  the  Certificate  Administrator  in writing at
least seven Business Days prior to a Distribution Date that such payments are to
be made by wire transfer of immediately available funds to the account specified
by such Person.  Notwithstanding  the above, the final distribution in reduction
of the principal  balance of this Certificate  shall be made after due notice of
the pendency of such  distribution  and only upon  presentation and surrender of
this  Certificate  at the office or agency  specified by the  Registrar for that
purpose in the notice of final distribution.

     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>

     Unless this Certificate has been  countersigned by an authorized officer of
the Registrar,  by manual  signature,  this Certificate shall not be entitled to
any benefit under the Agreement or be valid for any purpose.


<PAGE>

     IN WITNESS WHEREOF, the Certificate Administrator, as Registrar, has caused
this Certificate to be duly executed as of the date set forth below.

Dated:

                                      NORWEST BANK MINNESOTA, NATIONAL 
                                      ASSOCIATION,
                                      as Certificate Administrator



                                      By:  ------------------------------------
                                           Authorized Officer

Authenticated:

NORWEST BANK MINNESOTA, NATIONAL
ASSOCIATION,
as Registrar


By:  ---------------------------
     Authorized Officer


<PAGE>

                                    EXHIBIT B
                     [FORM OF FACE OF CLASS IO CERTIFICATE]

THIS  CERTIFICATE  IS  SUBORDINATED  IN  RIGHT  OF  PAYMENT  TO  THE  CLASS  A-1
CERTIFICATES AS DESCRIBED IN THE TRUST AGREEMENT REFERRED TO HEREIN.

THIS  CERTIFICATE  CONSTITUTES A "REGULAR  INTEREST" IN A "REAL ESTATE  MORTGAGE
INVESTMENT CONDUIT" AS THOSE TERMS ARE DEFINED IN SECTION 860G(a)(1) AND SECTION
860D, RESPECTIVELY, OF THE INTERNAL REVENUE CODE OF 1986, AS AMENDED.


<PAGE>

                          ADJUSTABLE RATE CERTIFICATE,
                                  SERIES 1996-1

                                    CLASS IO

evidencing a beneficial  ownership  interest in a trust  consisting  of mortgage
pass-through certificates sold by


                    CS FIRST BOSTON MORTGAGE SECURITIES CORP.
               (Not an interest in or obligation of the Depositor)

     THIS CERTIFICATE DOES NOT EVIDENCE AN OBLIGATION OF, OR AN INTEREST IN, THE
DEPOSITOR,  THE  CERTIFICATE   ADMINISTRATOR,   THE  TRUSTEE  OR  ANY  OF  THEIR
AFFILIATES,  AND IS NOT INSURED OR GUARANTEED BY THE DEPOSITOR,  THE CERTIFICATE
ADMINISTRATOR,  THE  TRUSTEE OR ANY OF THEIR  AFFILIATES,  OR BY ANY  GOVERNMENT
AGENCY OR PRIVATE INSURER.

Certificate No.  -----                  Cut-off Date: April 28, 1996

Percentage Interest evidenced           First Distribution Date:  July 29, 1996
by this Certificate:  [----]%


<PAGE>

     THIS  CERTIFIES THAT  ---------------------------------------------  is the
registered  owner of the Percentage  Interest  evidenced by this  Certificate in
monthly  distributions to the Holder of the Class IO Certificate with respect to
a  Trust  consisting  primarily  of  mortgage  pass-through   certificates  (the
"Mortgage  Certificates"),  formed by CS First Boston Mortgage  Securities Corp.
(the  "Depositor",  which term includes any successor entity under the Agreement
referred to below). The Trust was created pursuant to a Pooling Trust Agreement,
dated as of May 31, 1996 (the  "Agreement"),  among the Depositor,  Norwest Bank
Minnesota,  National Association, as certificate administrator (the "Certificate
Administrator"),  The Chase  Manhattan Bank (National  Association),  as trustee
(the "Trustee"), and Norwest Corporation, as tax beneficial holder, a summary of
certain of the pertinent  provisions of which is set forth below.  To the extent
not defined herein, the capitalized terms used herein have the meanings ascribed
to such terms in the Agreement.  This Certificate is issued under and is subject
to the terms, provisions and conditions of the Agreement, to which 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 Agreement, a distribution shall be made on the
28th day of each  January,  April,  July and  October  or,  if such day is not a
Business  Day,  the  following  Business  Day  (each,  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 last
Business Day of the month preceding the month of such  distribution (the "Record
Date"), in an amount equal to the product of the Percentage  Interest  evidenced
by this  Certificate and the amount  distributable  pursuant to the Agreement on
the Class IO Certificate for such Distribution Date,  subject to adjustment,  in
certain  events,  as specified in the  Agreement.  The amount of interest  which
accrues on this  Certificate  in any month  shall be subject to  reduction  with
respect to any Mortgage  Certificate  Prepayment Interest Shortfall and Deferred
Interest, as described in the Agreement.

     Distributions  on  this  Certificate  shall  be  made  by  the  Certificate
Administrator by check mailed to the address of the Person entitled thereto,  as
such name and  address  shall  appear on the  Certificate  Register  unless such
Person holds Class IO Certificate evidencing a 50% Percentage Interest, and such
Person has  notified  the  Certificate  Administrator  in writing at least seven
Business Days prior to a Distribution  Date that such payments are to be made by
wire transfer of immediately  available  funds.  Notwithstanding  the above, the
final  distribution  on this  Certificate  shall be made after due notice of the
pendency of such  distribution and only upon  presentation and surrender of this
Certificate at the office or agency  specified by the Registrar for that purpose
in the notice of final distribution.

     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>

     Unless this Certificate has been  countersigned by an authorized officer of
the Registrar,  by manual  signature,  this Certificate shall not be entitled to
any benefit under the Agreement or be valid for any purpose.


<PAGE>

     IN  WITNESS  WHEREOF,   the  Certificate   Administrator  has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                      NORWEST BANK MINNESOTA, NATIONAL 
                                      ASSOCIATION,
                                      as Certificate Administrator



                                      By:  ------------------------------------
                                           Authorized Officer

Authenticated:

NORWEST BANK MINNESOTA, NATIONAL
ASSOCIATION,
as Registrar


By:  ---------------------------
     Authorized Officer


<PAGE>

                                    EXHIBIT C
                      [FORM OF FACE OF CLASS R CERTIFICATE]

     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(a)(2) AND 860D OF THE INTERNAL REVENUE
CODE OF 1986,  AS AMENDED (THE  "CODE").  A TRANSFEREE  OF THIS  CERTIFICATE  BY
ACCEPTANCE  HEREOF,  IS DEEMED TO HAVE  ACCEPTED  THIS  CERTIFICATE  SUBJECT  TO
CERTAIN  RESTRICTIONS  ON  TRANSFERABILITY,  AS SET FORTH IN SECTION 4.02 OF THE
AGREEMENT,  AND SHALL BE REQUIRED TO FURNISH AN AFFIDAVIT TO THE  TRANSFEROR AND
THE TRUSTEE TO THE EFFECT THAT IT IS NOT A  DISQUALIFIED  ORGANIZATION,  AS SUCH
TERM IS  DEFINED  IN CODE  SECTION  860E(e)(5),  AN AGENT  (INCLUDING  A BROKER,
NOMINEE  OR  OTHER   MIDDLEMAN)  FOR  SUCH   DISQUALIFIED   ORGANIZATION   OR  A
NON-PERMITTED FOREIGN HOLDER, AS DEFINED IN SECTION 4.02(c) OF THE AGREEMENT AND
TO HAVE AGREED TO SUCH  AMENDMENTS TO THE TRUST  AGREEMENT AS MAY BE REQUIRED TO
FURTHER EFFECTUATE THE RESTRICTIONS ON TRANSFERS TO DISQUALIFIED  ORGANIZATIONS,
AGENTS THEREOF OR NON-PERMITTED FOREIGN HOLDERS.

     THE HOLDER OF THIS CLASS R CERTIFICATE, BY ACCEPTANCE HEREOF, AGREES (I) TO
ACT AS "TAX MATTERS PERSON" OF THE TRUST FUND TO PERFORM THE FUNCTIONS OF A "TAX
MATTERS PARTNER" FOR PURPOSES OF SUBCHAPTER C OF CHAPTER 63 OF SUBTITLE F OF THE
CODE, AND (II) TO THE IRREVOCABLE  DESIGNATION OF THE CERTIFICATE  ADMINISTRATOR
AS ITS AGENT IN  PERFORMING  THE  FUNCTIONS  OF TAX MATTERS  PERSON OF THE TRUST
FUND.

EXCEPT AS PROVIDED IN SECTION  4.02 OF THE TRUST  AGREEMENT  REFERRED TO HEREIN,
THIS  CERTIFICATE  MAY NOT BE PURCHASED BY OR TRANSFERRED TO ANY PERSON THAT HAS
NOT DELIVERED A REPRESENTATION  LETTER STATING EITHER (A) THAT THE TRANSFEREE IS
NOT AN EMPLOYEE BENEFIT PLAN SUBJECT TO THE FIDUCIARY RESPONSIBILITY  PROVISIONS
OF THE EMPLOYEE  RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED ("ERISA") OR
SECTION  4975 OF THE INTERNAL  REVENUE CODE OF 1986,  AS AMENDED (THE "CODE") 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 ANY
PERSON  INVESTING THE ASSETS OF A PLAN OR (B) SUBJECT TO CERTAIN  CONDITIONS SET
FORTH IN THE TRUST  AGREEMENT,  THAT THE SOURCE OF FUNDS USED TO  PURCHASE  THIS
CERTIFICATE IS AN "INSURANCE COMPANY GENERAL ACCOUNT."


<PAGE>

                          ADJUSTABLE RATE CERTIFICATE,
                                  SERIES 1996-1

                                     CLASS R

evidencing  a  beneficial  ownership  interest  in a trust  fund  consisting  of
mortgage pass-through certificates sold by


                    CS FIRST BOSTON MORTGAGE SECURITIES CORP.
               (Not an interest in or obligation of the Depositor)

     THIS CERTIFICATE DOES NOT EVIDENCE AN OBLIGATION OF, OR AN INTEREST IN, THE
DEPOSITOR,  THE  CERTIFICATE   ADMINISTRATOR,   THE  TRUSTEE  OR  ANY  OF  THEIR
AFFILIATES,  AND IS NOT INSURED OR GUARANTEED BY THE DEPOSITOR,  THE CERTIFICATE
ADMINISTRATOR,  THE  TRUSTEE OR ANY OF THEIR  AFFILIATES,  OR BY ANY  GOVERNMENT
AGENCY OR PRIVATE INSURER.

Certificate No. ---                    Cut-off Date:  April 28, 1996

Percentage Interest evidenced          First Distribution Date:  July 29, 1996
by this Certificate:  [----]%


<PAGE>

     THIS CERTIFIES THAT  ----------------------------------------------  is the
registered  owner of the Percentage  Interest  evidenced by this  Certificate in
monthly distributions to the Holder of the Class R Certificate with respect to a
Trust consisting primarily of mortgage pass-through  certificates (the "Mortgage
Certificates"),  formed  by CS  First  Boston  Mortgage  Securities  Corp.  (the
"Depositor",  which term  includes  any  successor  entity  under the  Agreement
referred to below).  The Trust was created pursuant to a Pooling Trust Agreement
dated as of May 31, 1996 (the  "Agreement"),  among the Depositor,  Norwest Bank
Minnesota,  National Association, as certificate administrator (the "Certificate
Administrator"),  The Chase  Manhattan Bank (National  Association),  as trustee
(the "Trustee"), and Norwest Corporation, as tax beneficial holder, a summary of
certain of the pertinent  provisions of which is set forth below.  To the extent
not defined herein, the capitalized terms used herein have the meanings ascribed
to such terms in the Agreement.  This Certificate is issued under and is subject
to the terms, provisions and conditions of the Agreement, to which 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 Agreement, a distribution shall be made on the
28th day of each  January,  April,  July and  October  or,  if such day is not a
Business  Day,  the  following  Business  Day  (each,  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 last
Business Day of the month preceding the month of such  distribution (the "Record
Date"), in an amount equal to the product of the Percentage  Interest  evidenced
by this  Certificate and the amount  distributable  pursuant to the Agreement on
the Class R Certificate for such Distribution  Date,  subject to adjustment,  in
certain  events,  as specified in the Agreement.  The Class R Certificate is not
generally expected to receive regular distributions.

     This  Certificate  represents a non-economic  residual  interest in a REMIC
and,  except for as  specified  in the  Agreement,  does not  entitle the Holder
hereof to any distributions with respect to the Trust Fund.

     No transfer of a Class R Certificate  shall be made unless the  Certificate
Administrator  receives a representation letter, in the form as described in the
Agreement,  stating that the  transferee  is not (a) a Plan and is not acting on
behalf of a Plan or using the assets of a Plan to effect such purchase, or (b) a
collective  investment fund in which Plans are invested or an insurance  company
using the assets of any  separate or general  account in which the assets of any
such Plan are invested (or which are deemed pursuant to ERISA or any similar law
to include  assets of Plans),  which  representation  letter shall not be at the
expense of the Trustee, Depositor or the Certificate Administrator.

     Any  distributions  on this  Certificate  shall be made by the  Certificate
Administrator by check mailed to the address of the Person entitled thereto,  as
such name and  address  shall  appear on the  Certificate  Register  unless such
Person holds Class R Certificates evidencing a 50% Percentage Interest, and such
Person has  notified  the  Certificate  Administrator  in writing at least seven
Business Days prior to a Distribution  Date that such payments are to be made by
wire transfer of immediately  available  funds.  Notwithstanding  the above, the
final  distribution  on this  Certificate  shall be made after due notice of the
pendency of such  distribution and only upon  presentation and surrender of this
Certificate at the office or agency  specified by the Registrar for that purpose
in the notice of final distribution.


<PAGE>

     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.

     Unless this Certificate has been  countersigned by an authorized officer of
the Registrar,  by manual  signature,  this Certificate shall not be entitled to
any benefit under the Agreement or be valid for any purpose.


<PAGE>

     IN  WITNESS  WHEREOF,   the  Certificate   Administrator  has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                      NORWEST BANK MINNESOTA, NATIONAL 
                                      ASSOCIATION,
                                      as Certificate Administrator



                                      By:  ------------------------------------
                                           Authorized Officer

Authenticated:

NORWEST BANK MINNESOTA, NATIONAL
ASSOCIATION,
as Registrar


By:  ---------------------------
     Authorized Officer

<PAGE>

                                    EXHIBIT D

                               [Form of Reverse of
                  Adjustable Rate Certificates, Series 1996-1]

                    CS FIRST BOSTON MORTGAGE SECURITIES CORP.

                   ADJUSTABLE RATE CERTIFICATES, SERIES 1996-1


     This Certificate is one of a duly authorized  issue of Certificates  issued
in several Classes designated as the Adjustable Rate Certificates, Series 1996-1
(herein collectively called the "Certificates").

     The Certificates are limited in right of payment to certain collections and
recoveries  respecting the Mortgage  Certificates,  all as more specifically set
forth herein and in the Agreement.

     The  Agreement  permits,  with certain  exceptions  therein  provided,  the
amendment of the Agreement and the modification of the rights and obligations of
the Depositor, the Certificate Administrator, the Trustee and the Tax Beneficial
Holder and the rights of the Certificateholders  under the Agreement at any time
by the Depositor, the Certificate Administrator and the Trustee with the consent
of the Holders of Certificates  evidencing  Percentage Interests aggregating not
less  than 66 2/3% 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  hereof or in lieu
hereof whether or not notation of such consent is made upon the Certificate. The
Agreement also permits the amendment  thereof in certain  circumstances  without
the consent of the Holders of any of the Certificates.

     As provided in the Agreement and subject to certain limitations therein set
forth,  the  transfer of this  Certificate  is  registrable  in the  Certificate
Register upon surrender of this  Certificate for registration of transfer at the
office or agency appointed by the Registrar, duly endorsed by, or accompanied by
an  assignment  in the form below or other  written  instrument of transfer in a
form  satisfactory to the Registrar,  duly executed by the Holder hereof or such
Holder's  attorney  duly  authorized  in writing,  and thereupon one or more new
Certificates of authorized denominations evidencing the same Class and aggregate
Percentage Interest shall be issued to the designated transferee or transferees.

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


<PAGE>

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

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

     The obligations created by the Agreement in respect of the Certificates and
the  Trust  created  thereby  shall  terminate  upon  the  earlier  of  (i)  The
Distribution  Date  following  the  purchase by the  Depositor  of all  Mortgage
Certificates remaining in the Trust Fund at the price and on the terms specified
in  the  Agreement  and  (ii)  the  final  distribution  to  Certificateholders;
provided,  however,  that the Trust Fund shall in no event  continue  beyond the
expiration of 21 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's, living on the date of the 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  beneficial  interest  evidenced  by the within  Adjustable  Rate
Certificate, Series 1996-1 and hereby authorizes the transfer of registration of
such interest to assignee on the Certificate Register of the Trust.

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

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

Social Security or other Identifying Number of Assignee:

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



Dated:


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



                                       -------------------------------------
                                       Signature Guaranteed


                            DISTRIBUTION INSTRUCTIONS

     The assignee should include the following for purposes of distribution:

     Distributions  shall  be made,  if the  assignee  is  eligible  to  receive
distributions in immediately available funds, 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>

                                    EXHIBIT E

                    FORM OF INVESTMENT REPRESENTATION LETTER
         FOR QUALIFIED INSTITUTIONAL BUYERS AND PERSONS INVOLVED IN THE
                  ORGANIZATION OR OPERATION OF THE TRUST FUND


Norwest Bank Minnesota, National Association
Corporate Trust Department
6th Street and Marquette Avenue
Minneapolis, Minnesota  55470-0069

     The undersigned  (the  "Purchaser")  proposes to purchase certain of the CS
First Boston Mortgage  Securities Corp.,  Adjustable Rate  Certificates,  Series
1996-1,  Class [IO] [R] (the  "Class [IO] [R]  Certificates").  In doing so, the
Purchaser hereby acknowledges and agrees as follows:

     Section 1. Definitions. Each capitalized term used herein and not otherwise
defined  herein shall have the meaning given it in the Pooling Trust  Agreement,
dated as of May 30, 1996,  among CS First Boston Mortgage  Securities  Corp., as
depositor (the "Depositor"),  Norwest Bank Minnesota,  National Association,  as
certificate administrator (the "Certificate Administrator"), The Chase Manhattan
Bank  (National   Association),   as  trustee  (the   "Trustee"),   and  Norwest
Corporation,   as  tax  beneficial  holder,  relating  to  the  Class  [IO]  [R]
Certificates.

     Section 2.  Representations and Warranties of the Purchaser.  In connection
with the  proposed  transfer,  the  Purchaser  represents  and  warrants  to the
Depositor and the Certificate Administrator that:

          (a) The Purchaser either (x) is a "qualified  institutional buyer," as
     such term is  defined  in Rule 144A under the  Securities  Act of 1933,  as
     amended  (the  "Securities  Act"),  and is aware that the sale of the Class
     [IO] [R]  Certificates to it is being made in reliance on Rule 144A and has
     such  knowledge  of financial  and  business  matters that it is capable of
     evaluating  the  merits  and risks of an  investment  in the Class [IO] [R]
     Certificates;  the  Purchaser  has sought  such  accounting,  legal and tax
     advice  as it has  considered  necessary  to  make an  informed  investment
     decision;  and  the  Purchaser  is able to  bear  the  economic  risk of an
     investment in the Class [IO] [R] Certificates  for an indefinite  period of
     time or (y) is a person  involved in the  organization  or operation of the
     Trust Fund or an  affiliate  of such person as such term is defined in Rule
     405 under the Securities Act.

          (b)  Neither  the  Purchaser  nor any person  acting on its behalf has
     offered or will offer or sold or will sell the Class [IO] [R]  Certificates
     in a  manner  that  would  make a public  offering  of the  Class  [IO] [R]
     Certificates  under the Securities Act or require the  registration  of the
     Class  [IO] [R]  Certificates  under  the  Securities  Act or any  state or
     foreign securities laws.

          (c) Either (i) the  Purchaser is not an employee  benefit plan subject
     to the  fiduciary  responsibility  provisions  of the  Employee  Retirement
     Income  Security Act of 1974, as amended,  ("ERISA") or Section 4975 of the
     Internal  Revenue Code of 1986, as amended (the "Code") or any governmental
     plan, as defined in Section 3(32) of ERISA subject to any federal, state or
     local  law("Similar  Law)  which is, to a material  extent,  similar to the
     foregoing  provisions  of ERISA or the Code  (collectively,  a "Plan"),  an
     agent  acting on behalf of a Plan,  or a person  utilizing  the assets of a
     Plan or (ii) if the Purchaser is an insurance company,  the source of funds
     used to purchase the Class [IO] [R]  Certificate  is an "insurance  company
     general  account"  (as such term is defined in Section  V(e) of  Prohibited
     Transaction  Class Exemption 95-60 ("PTE 95-60"),  60 Fed. Reg. 35925 (July
     12,  1995) and there is no Plan with  respect  to which the  amount of such
     general  account's  reserves and liabilities for the contract(s) held by or
     on behalf of such Plan and all other Plans  maintained by the same employer
     (or affiliate thereof as defined in Section V(a)(1) of PTE 95-60) or by the
     same  employee  organization,  exceed 10% of the total of all  reserves and
     liabilities of such general  account (as such amounts are determined  under
     Section  I(a)  of PTE  95-60)  at the  date of  acquisition  or  (iii)  the
     Purchaser  has  provided  a  "Benefit  Plan  Opinion"  satisfactory  to the
     Depositor and the  Certificate  Administrator  of the Trust Fund. A Benefit
     Plan  Opinion is an opinion  of  counsel  to the effect  that the  proposed
     transfer  will not (a) cause the assets of the Trust Fund to be regarded as
     "plan  assets" and subject to the  fiduciary  responsibility  provisions of
     ERISA or the prohibited  transaction  provisions of the Code or Similar Law
     on the part of the Depositor or the Certificate  Administrator with respect
     to any Plan or (c)  constitute  a  prohibited  transaction  under  ERISA or
     Section 4975 of the Code or Similar Law.

          (d) The  Purchaser was not formed solely to acquire the Class [IO] [R]
     Certificates.

          (e) If the  Purchaser  is a savings  association,  the  Purchaser  has
     complied,  and will continue to comply, with the guidelines  established by
     Thrift  Bulletin 12 issued  December 13, 1988,  by the Office of Regulatory
     Activities of the Federal Home Loan Bank System.

     Section 3. Transfer of Certificates.

          (a) The  Purchaser  understands  that the Class [IO] [R]  Certificates
     have not been and will not be registered  under the  Securities  Act or any
     state or foreign securities laws. The Purchaser  understands that the Class
     [IO] [R] Certificates  may be transferred,  resold or pledged only (i) to a
     person  reasonably  believed  to  be  a  "qualified   institutional  buyer"
     purchasing  for  its  own  account  or  for  the  account  of a  "qualified
     institutional  buyer" to whom  notice is given that the  resale,  pledge or
     transfer is being made in reliance on Rule 144A under the Securities Act or
     (ii)  to  sophisticated   institutional  investors  which  are  "accredited
     investors"  as such term is defined  in Rule 501  (a)(1),  (2),  (3) or (7)
     under the Securities Act, or, if the Class [IO] [R]  Certificates are to be
     purchased for one or more institutional  accounts ("investor accounts") for
     which a person is acting as fiduciary or agent  (except if such person is a
     bank as defined in Section  3(a)(2) of the Securities Act, or a savings and
     loan association or other institution as described in Section 3(a)(5)(A) of
     the  Securities  Act,  whether  acting in its  individual or in a fiduciary
     capacity),  each such investor account is an institutional  investor and an
     "accredited  investor" on a like basis. The Purchaser  further  understands
     that neither the Depositor nor the Certificate  Administrator  is under any
     obligation to register the Class [IO] [R] Certificates or make an exemption
     available. In the event that such a transfer is to be made in reliance upon
     an exemption from the Securities Act and from  applicable  state or foreign
     securities  laws,  unless such Transfer is made in reliance on Rule 144A of
     the  Securities  Act by a Person not  affiliated  with the  Depositor,  the
     Certificate  Administrator  or the Depositor  may, if such transfer is made
     within  three years from the later of (A) the Closing Date and (B) the last
     date on which the  Depositor  or any  affiliate  of the  Depositor  was the
     beneficial  owner of the  Certificate  which is proposed to be transferred,
     require an Opinion of Counsel that such transfer may be made pursuant to an
     exemption  from the  Securities  Act and any  applicable  state and foreign
     securities  laws,  which  Opinion of Counsel shall not be an expense of the
     Certificate  Administrator,  the Trustee or the  Depositor.  The  Purchaser
     shall,  and does hereby agree to,  indemnify the Certificate  Administrator
     and the Depositor  against any liability that may result if the transfer is
     not so exempt or is, not made in accordance  with such  federal,  state and
     foreign laws.

          (b) No transfer of a Class [IO] [R]  Certificate  shall be made unless
     the  prospective  transferee  provides the  Depositor  and the  Certificate
     Administrator with an Investment Representation Letter substantially in one
     of the forms attached as Exhibit E or Exhibit F to the Trust Agreement.


<PAGE>

IN WITNESS  WHEREOF,  the undersigned has caused this Investment  Representation
Letter to be validly  executed by its duly authorized  representative  as of the
date written below.



Date:-------------------------------   -----------------------------------------
                                       (Name of Purchaser)


                                       By:--------------------------------------
                                          Name (please print):
                                          Title:


<PAGE>

                                    EXHIBIT F

                    FORM OF INVESTMENT REPRESENTATION LETTER
                             FOR ACCREDITED INVESTOR


Norwest Bank Minnesota, National Association
Corporate Trust Department
6th Street and Marquette Avenue
Minneapolis, Minnesota  55470-0069

     The undersigned  (the  "Purchaser")  proposes to purchase certain of the CS
First Boston Mortgage  Securities Corp.,  Adjustable Rate  Certificates,  Series
1996-1,  Class [IO] [R] (the  "Class [IO] [R]  Certificates").  In doing so, the
Purchaser hereby acknowledges and agrees as follows:

     Section 1. Definitions. Each capitalized term used herein and not otherwise
defined  herein shall have the meaning given it in the Pooling Trust  Agreement,
dated as of May 30, 1996,  among CS First Boston Mortgage  Securities  Corp., as
depositor (the "Depositor"),  Norwest Bank Minnesota,  National Association,  as
certificate  administrator  (the  "Certificate  Administrator")  and  The  Chase
Manhattan Bank (National Association),  as trustee (the "Trustee"),  relating to
the Class [IO] [R] Certificates.

     Section 2.  Representations and Warranties of the Purchaser.  In connection
with the  proposed  transfer,  the  Purchaser  represents  and  warrants  to the
Depositor and the Certificate Administrator that:

     (a) The Purchaser is a  sophisticated  institutional  investor  which is an
"accredited investor" as such term is defined in Rule 501(a)(1), (2), (3) or (7)
under the Securities Act of 1933, as amended (the "Securities  Act"), or, if the
Class [IO] [R]  Certificates  are to be purchased for one or more  institutional
accounts ("investor accounts') for which the Purchaser is acting as fiduciary or
agent  (except if the  Purchaser is a bank as defined in Section  3(a)(2) of the
Securities  Act,  or a savings  and loan  association  or other  institution  as
described in Section  3(a)(5)(A) of the  Securities  Act,  whether acting in its
individual  or in a  fiduciary  capacity),  each  such  investor  account  is an
institutional investor and an "accredited investor" on a like basis.

     (b) In the  normal  course of its  business,  the  Purchaser  invests in or
purchases securities similar to the Class [IO] [R] Certificates, and it has such
knowledge of financial and business matters that it is capable of evaluating the
merits  and risks of an  investment  in the  Class  [IO] [R]  Certificates;  the
Purchaser has sought such accounting,  legal and tax advice as it has considered
necessary to make an informed  investment  decision;  and the  Purchaser (or any
investor  account) is able to bear the  economic  risk of an  investment  in the
Class [IO] [R] Certificates for an indefinite period of time.


<PAGE>

     (c) The  Purchaser is  acquiring  the Class [IO] [R]  Certificates  for the
purpose  of  investment  and  not  with  a view  to or in  connection  with  the
distribution  thereof in violation of the Securities Act or any state or foreign
securities  laws,  and neither the Purchaser nor any person acting on its behalf
has  offered or will offer or sold or will sell the Class [IO] [R]  Certificates
in a manner that would make a public offering of the Class [IO] [R] Certificates
under the  Securities  Act or  require  the  registration  of the Class [IO] [R]
Certificates under the Securities Act or any state or foreign securities laws.

     (d) Either (i) the Purchaser is not an employee benefit plan subject to the
fiduciary  responsibility  provisions of the Employee Retirement Income Security
Act of 1974, as amended,  ("ERISA") or Section 4975 of the Internal Revenue Code
of 1986, as amended (the "Code") or any governmental plan, as defined in Section
3(32) of ERISA subject to any federal,  state or local  law("Similar  Law) which
is, to a material  extent,  similar to the foregoing  provisions of ERISA or the
Code (collectively,  a "Plan"), an agent acting on behalf of a Plan, or a person
utilizing the assets of a Plan or (ii) if the Purchaser is an insurance company,
the  source of funds  used to  purchase  the Class  [IO] [R]  Certificate  is an
"insurance  company general account" (as such term is defined in Section V(e) of
Prohibited  Transaction Class Exemption 95-60 ("PTE 95-60"),  60 Fed. Reg. 35925
(July 12,  1995) and there is no Plan with  respect  to which the amount of such
general  account's  reserves and liabilities  for the contract(s)  held by or on
behalf of such Plan and all other  Plans  maintained  by the same  employer  (or
affiliate  thereof as  defined  in Section  V(a)(1) of PTE 95-60) or by the same
employee  organization,  exceed 10% of the total of all reserves and liabilities
of such general  account (as such amounts are  determined  under Section I(a) of
PTE 95-60) at the date of  acquisition  or (iii) the  Purchaser  has  provided a
"Benefit  Plan  Opinion"  satisfactory  to the  Depositor  and  the  Certificate
Administrator of the Trust Fund. A Benefit Plan Opinion is an opinion of counsel
to the effect that the  proposed  transfer  will not (a) cause the assets of the
Trust  Fund to be  regarded  as  "plan  assets"  and  subject  to the  fiduciary
responsibility  provisions of ERISA or the prohibited  transaction provisions of
the  Code  or  Similar  Law on the  part  of the  Depositor  or the  Certificate
Administrator   with  respect  to  any  Plan  or  (c)  constitute  a  prohibited
transaction under ERISA or Section 4975 of the Code or Similar Law.

     (e) If the Purchaser is a savings association.  the Purchaser has complied,
and will continue to comply, with the guidelines  established by Thrift Bulletin
12 issued  December  13, 1988,  by the Office of  Regulatory  Activities  of the
Federal Home Loan Bank System.


<PAGE>

     Section 3. Transfer of Class [IO] [R] Certificates.

     (a) The Purchaser  understands that the [IO] [R] Certificates have not been
and will not be  registered  under the  Securities  Act or any state or  foreign
securities laws. The Purchaser  understands that the Class [IO] [R] Certificates
may be transferred,  resold or pledged only (i) to a person reasonably  believed
to be a "qualified institutional buyer purchasing for its own account or for the
account of a  "qualified  institutional  buyer" to whom notice is given that the
resale,  pledge or  transfer  is being made in  reliance  on Rule 144A under the
Securities  Act or (ii)  to  sophisticated  institutional  investors  which  are
"accredited  investors" as such term is defined in Rule 501 (a)(1),  (2), (3) or
(7) under the Securities Act, or, if the Class [IO] [R]  Certificates  are to be
purchased for one or more institutional accounts ("investor accounts") for which
a person is acting as  fiduciary  or agent  (except if such  person is a bank as
defined  in  Section  3(a)(2)  of the  Securities  Act,  or a  savings  and loan
association  or other  institution  as  described in Section  3(a)(5)(A)  of the
Securities  Act,  whether acting in its individual or in a fiduciary  capacity),
each such  investor  account  is an  institutional  investor  and an  accredited
investor" on a like basis.  The Purchaser  further  understands that neither the
Depositor nor the Certificate  Administrator is under any obligation to register
the Class [IO] [R]  Certificates  or make an exemption  available.  In the event
that  such a  transfer  is to be made in  reliance  upon an  exemption  from the
Securities Act and from applicable state or foreign securities laws, unless such
Transfer is made in reliance on Rule 144A of the  Securities Act by a Person not
affiliated with the Depositor,  the Certificate  Administrator  or the Depositor
may,  if such  transfer  is made  within  three  years from the later of (A) the
Closing Date and (B) the last date on which the  Depositor  or any  affiliate of
the Depositor was the beneficial  owner of the Class [IO] [R] Certificate  which
is proposed to be transferred,  require an Opinion of Counsel that such transfer
may be made pursuant to an exemption  from the Securities Act and any applicable
state and foreign  securities  laws,  which  Opinion of Counsel  shall not be an
expense of the  Certificate  Administrator,  the Trustee or the  Depositor.  The
Purchaser   shall,   and  does  hereby  agree  to,   indemnify  the  Certificate
Administrator  and the Depositor  against any  liability  that may result if the
transfer is not so exempt or is not made in accordance with such federal,  state
and foreign laws.

     (b) No  transfer of a Class [IO] [R]  Certificate  shall be made unless the
prospective transferee provides the Depositor and the Certificate  Administrator
with an  Investment  Representation  Letter  substantially  in one of the  forms
attached as Exhibit E or Exhibit F to the Trust Agreement.


<PAGE>

     IN  WITNESS   WHEREOF,   the   undersigned   has  caused  this   Investment
Representation   Letter  to  be  validly   executed   by  its  duly   authorized
representative as of the date written below.



Date:-------------------------------   -----------------------------------------
                                       (Name of Purchaser)


                                       By:  ------------------------------------
                                            Name (please print):
                                            Title:


<PAGE>

                                    EXHIBIT G

                                             AFFIDAVIT   PURSUANT   TO   SECTION
                                             860E(e)(4) OF THE INTERNAL  REVENUE
                                             CODE OF 1986,  AS AMENDED,  AND FOR
                                             NON-ERISA INVESTORS

STATE OF          )
                   ss.:
COUNTY OF         )

     [NAME OF OFFICER], being first duly sworn, deposes and says:

     1. That he is [Title of Officer] of [Name of Purchaser] (the  "Purchaser"),
a [description  of type of entity] duly organized and existing under the laws of
the  [State of  -------]  [United  States],  on  behalf  of which he makes  this
affidavit.

     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" or an ERISA Prohibited Holder, as of [date of transfer],  and that
the Purchaser is not acquiring the Adjustable Rate Certificates,  Series 1996-1,
Class R Certificate (the "Class R Certificate")  for the account of, or as agent
(including 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  of  any  of  the
foregoing (other than an 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  taxation  under the Code
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.


<PAGE>

     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 Class R  Certificate  as they
become due.

     5. That the Purchaser  understands  that it may incur tax liabilities  with
respect  to the Class R  Certificate  in excess of cash flows  generated  by the
Class R Certificate.

     6. That the  Purchaser  will not  transfer the Class R  Certificate  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 paragraph 3, 4 or 7 hereof
are not  satisfied or that the Purchaser 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 Class R Certificate  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 successor
form at the time and in the manner  required  by the Code 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 Class R
Certificate  to it is in accordance  with the  requirements  of the Code and the
regulations  promulgated  thereunder  and  that  such  transfer  of the  Class R
Certificate  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,  partnership or other
entity  created or  organized  in or under the laws of the United  States or any
political  subdivision  thereof,  or an estate or trust  that is subject to U.S.
federal income tax regardless of the source of its income.

     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 Class
R Certificate to such a "disqualified  organization," an agent thereof, an ERISA
Prohibited  Holder  or a  person  that  does not  satisfy  the  requirements  of
paragraph 4, paragraph 5 and paragraph 7 hereof.

     9. That the Purchaser  consents to the  designation  of the Servicer as its
agent to act as "tax matters person" of the REMIC pursuant to Section 2.05(c) of
the Trust  Agreement,  and if such  designation is not permitted by the Code and
applicable law, to act as tax matters person if requested to do so.


<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 [Title of
Officer] this ---- day of -------------, 19 --.

                                      [NAME OF PURCHASER]


                                   By:-------------------------------
                                      [Name of Officer]
                                      [Title of Officer]

     Personally  appeared before me the above-named [Name of Officer],  known or
proved to me to be the same person who executed the foregoing  instrument and to
be the [Title of Officer],  of the  Purchaser,  and  acknowledged  to me that he
[she] executed the same as his [her] free act and deed and the free act and deed
of the Purchaser.


     Subscribed and sworn before me this ---- day of ------------, 19 --.

- -----------------------------
NOTARY PUBLIC

COUNTY OF--------------------

STATE OF---------------------

My commission expires the ----- day of -------------, 19--.


<PAGE>

                                    EXHIBIT H





                 [Letter from Transferor of Class R Certificate]





                                     [Date]




Norwest Bank Minnesota, National Association
Corporate Trust Department
6 and Marquette
Minneapolis, Minnesota  55470-0069

                  Re:      Adjustable Rate Certificates,
                           Series 1996-1, Class R
                           -----------------------------

Ladies and Gentlemen:

     [Transferor] has reviewed the attached  affidavit of [Transferee],  and has
no actual  knowledge  that such  affidavit is not true and has no reason to know
that the  information  contained in paragraph 4 thereof is not true.  
                                        
                                             Very truly yours,
                                             [Transferor]

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


<PAGE>

                                    EXHIBIT I

                        [FORM OF YIELD SUPPORT AGREEMENT]


<PAGE>

                                    EXHIBIT J

                      [FORM OF PRICE MAINTENANCE AGREEMENT]


<PAGE>

                                    EXHIBIT K

                                [FORM OF POLICY]


<PAGE>

                                    EXHIBIT L

                          [FORM OF INSURANCE AGREEMENT]


<PAGE>

                                    EXHIBIT M

                               [Form of Due Bill]

                          RESOLUTION TRUST CORPORATION,
                       MORTGAGE PASS-THROUGH CERTIFICATES,
              SERIES -----, CLASS ---- (THE "MORTGAGE CERTIFICATE")
                            OVERDUE INTEREST DUE BILL
                                NON-TRANSFERABLE



                       Date:             ------------ --, 199--

                       Control No.:      ----------------------
                       Delivery Bill No.:----------------------

[Purchaser]
[Purchaser Address]
[Purchaser Address]

AGREES TO DELIVER TO            MBIA Insurance Corporation
                                113 King Street
                                Armonk, NY  10504
                                Attn:  Insured Portfolio Management-
                                       Structured Finance (IPM-SF)

RECORD ON ---------------
            (MM/DD/YY)

OVERDUE AMOUNT                  $-----------------------.

MBIA CLAIM                      $-----------------------.




The  undersigned   purchaser  of  the  above  referenced  Mortgage   Certificate
acknowledges  that there  exists an Unpaid  Interest  Shortfall or other form of
overdue  interest with respect to such Mortgage  Certificate  (such amount,  the
"Overdue Amount") in the amount set forth above and acknowledges that MBIA has a
claim to such Overdue  Amount in the amount set forth above (the "MBIA  Claim").
The  undersigned  agrees  to pay to MBIA the  Overdue  Amount,  when and if such
Overdue  Amount is paid with  respect  to the  Mortgage  Certificate,  up to the
amount of the MBIA Claim.

On our payment to you for this due bill,  you will guarantee to hold us free and
harmless from any further claims in this matter.



BY:------------------------------------
         (AUTHORIZED SIGNATURE)





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