NORWEST ASSET SEC CORP MORT PASS THR CERT SER 1999-17 TRUST
8-K, 1999-07-20
ASSET-BACKED SECURITIES
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                    FORM 8-K

                                 CURRENT REPORT

                     Pursuant to Section 13 or 15(d) of the

                         Securities Exchange Act of 1934

Date of Report:  May 26, 1999
(Date of earliest event reported)

Commission File No.  333-65481

                      Norwest Asset Securities Corporation

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



              Delaware                                   52-1972128

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

     7485 New Horizon Way, Frederick, Maryland                    21703
- -----------------------------------------------------     ----------------------
       Address of principal executive offices                   (Zip Code)

                                 (301) 846-8881

- --------------------------------------------------------------------------------
               Registrant's Telephone Number, including area code

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


<PAGE>




                                      -4-

Document2

ITEM 5.     Other Events

On May 26, 1999, Norwest Asset Securities  Corporation,  a Delaware  corporation
(the "Registrant"),  sold Mortgage  Pass-Through  Certificates,  Series 1999-17,
Class A-1,  Class A-2, Class A-3, Class A-4, Class A-R, Class B-1, Class B-2 and
Class B-3 (the "Offered  Certificates"),  having an aggregate original principal
balance of $222,362,000.00.  The Offered  Certificates were issued pursuant to a
Pooling and Servicing Agreement, dated as of May 26, 1999, among the Registrant,
Norwest Bank Minnesota,  National  Association,  as master servicer (the "Master
Servicer"  or "Norwest  Bank"),  United  States  Trust  Company of New York,  as
trustee and First Union National Bank, as trust administrator (the "Agreement"),
a  copy  of  which  is  filed  as  an  exhibit  hereto.   Mortgage  Pass-Through
Certificates,  Series  1999-17,  Class A-PO  Certificates,  having an  aggregate
initial principal  balance of $1,663,497.87,  and Class B-4, Class B-5 and Class
B-6 Certificates, having an aggregate initial principal balance of $1,126,103.87
(the  "Private  Class  B  Certificates"   and,  together  with  the  Class  A-PO
Certificates and the Offered Certificates, the "Certificates"), were also issued
pursuant to the Agreement.

As of the date of  initial  issuance,  the  Offered  Certificates  evidenced  an
approximate  98.76%  undivided  interest in a trust fund (the  "Trust  Estate"),
consisting principally of a pool of fixed interest rate,  conventional,  monthly
pay,  fully-amortizing,  one-to  four-family  residential  first mortgage loans,
other than the Fixed  Retained  Yield (as defined in the  Agreement),  which may
include  loans  secured by shares issued by  cooperative  housing  corporations,
originated in connection  with the relocation of employees by various  corporate
employers that participated in the relocation program of Norwest Mortgage,  Inc.
and of employees of various non-participant  employees.  The remaining undivided
interests in the Trust Estate are  evidenced by the Class A-PO and Private Class
B  Certificates.   Distributions   on  the  Private  Class  B  Certificates  are
subordinated to  distributions  on the Offered  Certificates  and the Class A-PO
Certificates.

Interest on the  Offered  Certificates  (other than the Class A-4  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.  Distributions  of interest and in
reduction  of  principal  balance on any  Distribution  Date will be made to the
extent that the Pool Distribution Amount is sufficient therefor.

An election will be made to treat the Trust Estate as a REMIC for federal income
tax purposes (the  "REMIC").  The Class A-1,  Class A-2,  Class A-3,  Class A-4,
Class A-PO,  Class B-1, Class B-2, Class B-3, Class B-4, Class B-5 and Class B-6
Certificates  will be treated as "regular  interests" in the REMIC and the Class
A-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 and Servicing Agreement, dated as
                                    of May 26, 1999, among Norwest Asset
                                    Securities Corporation, Norwest Bank
                                    Minnesota, National Association, United
                                    States Trust Company of New York, as
                                    trustee and First Union National Bank, as
                                    trust administrator.



<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.

                                    NORWEST ASSET SECURITIES CORPORATION

May 26, 1999                        /s/ Alan S. McKenney
                                    -----------------------------------
                                    Alan S.  McKenney
                                    Vice President


<PAGE>





                                INDEX TO EXHIBITS

                                                       Paper (P) or

Exhibit No.            Description                     Electronic (E)

  (EX-4)               Pooling and Servicing             E
                       Agreement, dated as of May 26,
                       1999 among Norwest Asset
                       Securities Corporation,
                       Norwest Bank Minnesota,
                       National Association, United
                       States Trust Company of New
                       York, as trustee and First
                       Union National Bank, as trust
                       administrator.




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


                      NORWEST ASSET SECURITIES CORPORATION

                                    (Seller)

                                       and

                 NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION

                                (Master Servicer)

                   UNITED STATES TRUST COMPANY OF NEW YORK

                                    (Trustee)

                                       and

                            FIRST UNION NATIONAL BANK

                              (Trust Administrator)

                         POOLING AND SERVICING AGREEMENT

                            Dated as of May 26, 1999

                               $225,151,601.74

                       Mortgage Pass-Through Certificates

                                 Series 1999-17

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




<PAGE>







                                TABLE OF CONTENTS

                                                                            PAGE

                                    ARTICLE I

                                   DEFINITIONS

Section 1.01  Definitions..................................................
Section 1.02  Acts of Holders..............................................
Section 1.03  Effect of Headings and Table of Contents.....................
Section 1.04  Benefits of Agreement........................................


                                   ARTICLE II

                          CONVEYANCE OF MORTGAGE LOANS;

                      ORIGINAL ISSUANCE OF THE CERTIFICATES

Section 2.01  Conveyance of Mortgage Loans.................................
Section 2.02  Acceptance by Trust Administrator............................
Section 2.03  Representations and Warranties of the Master Servicer and
               the Seller..................................................
Section 2.04  Execution and Delivery of Certificates.......................
Section 2.05  Designation of Certificates; Designation of Startup Day
               and Latest Possible Maturity Date...........................

                                   ARTICLE III

                       ADMINISTRATION OF THE TRUST ESTATE;

                         SERVICING OF THE MORTGAGE LOANS

Section 3.01  Certificate Account..........................................
Section 3.02  Permitted Withdrawals from the Certificate Account...........
Section 3.03  Advances by Master Servicer and Trust Administrator..........
Section 3.04  Trust Administrator to Cooperate; Release of Owner
               Mortgage Loan Files.........................................
Section 3.05  Reports to the Trustee and Trust Administrator; Annual
               Compliance Statements.......................................
Section 3.06  Title, Management and Disposition of Any REO Mortgage

               Loan........................................................
Section 3.07  Amendments to Servicing Agreements, Modification of

               Standard Provisions.........................................
Section 3.08  Oversight of Servicing.......................................
Section 3.09  Termination and Substitution of Servicing Agreements.........
Section 3.10  Application of Net Liquidation Proceeds......................
Section 3.11  1934 Act Reports.............................................


                                   ARTICLE IV

                  DISTRIBUTIONS IN RESPECT OF CERTIFICATES;

                         PAYMENTS TO CERTIFICATEHOLDERS;

                             STATEMENTS AND REPORTS

Section 4.01  Distributions................................................
Section 4.02  Allocation of Realized Losses................................
Section 4.03  Paying Agent.................................................
Section 4.04  Statements to Certificateholders; Report to the Trust
               Administrator, Ambac and the Seller.........................
Section 4.05  Reports to Mortgagors and the Internal Revenue Service.......
Section 4.06  Reserve Fund.................................................
Section 4.07  Distributions in Reduction of the Class A-3 Certificates.....
Section 4.08  Policy Matters...............................................
Section 4.09  Calculation of Amounts; Binding Effect of Interpretations
               and Actions of Master Servicer..............................

                                    ARTICLE V

                                THE CERTIFICATES

Section 5.01  The Certificates.............................................
Section 5.02  Registration of Certificates.................................
Section 5.03  Mutilated, Destroyed, Lost or Stolen Certificates............
Section 5.04  Persons Deemed Owners........................................
Section 5.05  Access to List of Certificateholders' Names and Addresses....
Section 5.06  Maintenance of Office or Agency..............................
Section 5.07  Definitive Certificates......................................
Section 5.08  Notices to Clearing Agency...................................


                                   ARTICLE VI

                       THE SELLER AND THE MASTER SERVICER

Section 6.01  Liability of the Seller and the Master Servicer..............
Section 6.02  Merger or Consolidation of the Seller or the Master
               Servicer....................................................
Section 6.03  Limitation on Liability of the Seller, the Master

               Servicer and Others.........................................
Section 6.04  Resignation of the Master Servicer...........................
Section 6.05  Compensation to the Master Servicer..........................
Section 6.06  Assignment or Delegation of Duties by Master Servicer........
Section 6.07  Indemnification of Trustee, Trust Administrator and
               Seller by Master Servicer...................................
Section 6.08  Master Servicer Covenants Concerning Year 2000 Compliance....

                                   ARTICLE VII

                                     DEFAULT

Section 7.01  Events of Default............................................
Section 7.02  Other Remedies of Trustee....................................
Section 7.03  Directions by Certificateholders and Duties of Trustee
               During Event of Default.....................................
Section 7.04  Action upon Certain Failures of the Master Servicer and

               upon Event of Default.......................................
Section 7.05  Trust Administrator to Act; Appointment of Successor.........
Section 7.06  Notification to Certificateholders...........................


                                  ARTICLE VIII

              CONCERNING THE TRUSTEE AND THE TRUST ADMINISTRATOR

Section 8.01  Duties of Trustee and the Trust Administrator................
Section 8.02  Certain Matters Affecting the Trustee and the Trust
               Administrator...............................................
Section 8.03  Neither Trustee nor Trust Administrator Required to Make

               Investigation...............................................
Section 8.04  Neither Trustee nor Trust Administrator Liable for

               Certificates or Mortgage Loans..............................
Section 8.05  Trustee and Trust Administrator May Own Certificates.........
Section 8.06  The Master Servicer to Pay Fees and Expenses.................
Section 8.07  Eligibility Requirements.....................................
Section 8.08  Resignation and Removal......................................
Section 8.09  Successor....................................................
Section 8.10  Merger or Consolidation......................................
Section 8.11  Authenticating Agent.........................................
Section 8.12  Separate Trustees and Co-Trustees............................
Section 8.13  Appointment of Custodians....................................
Section 8.14  Tax Matters; Compliance with REMIC Provisions................
Section 8.15  Monthly Advances.............................................
Section 8.16  Trustee Covenants Concerning Year 2000 Compliance............
Section 8.17  Trust Administrator Covenants Concerning Year 2000
               Compliance..................................................

                                   ARTICLE IX

                                   TERMINATION

Section 9.01  Termination upon Purchase by the Seller or Liquidation of
               All Mortgage Loans..........................................

Section 9.02  Additional Termination Requirements..........................

                                    ARTICLE X

                            MISCELLANEOUS PROVISIONS

Section 10.01 Amendment....................................................
Section 10.02 Recordation of Agreement.....................................
Section 10.03 Limitation on Rights of Certificateholders...................
Section 10.04 Governing Law; Jurisdiction..................................
Section 10.05 Notices......................................................
Section 10.06 Severability of Provisions...................................
Section 10.07 Special Notices to Rating Agencies and Ambac.................
Section 10.08 Covenant of Seller...........................................
Section 10.09 Recharacterization...........................................

                                   ARTICLE XI

                             TERMS FOR CERTIFICATES

Section 11.01 Class A Fixed Pass-Through Rate..............................
Section 11.02 Cut-Off Date.................................................
Section 11.03 Cut-Off Date Aggregate Principal Balance.....................
Section 11.04 Original Class A Percentage..................................
Section 11.05 Original Principal Balances of the Classes of Class A

               Certificates................................................
Section 11.06 Original Class A Non-PO Principal Balance....................
Section 11.07 Original Subordinated Percentage.............................
Section 11.08 Original Class B-1 Percentage................................
Section 11.09 Original Class B-2 Percentage................................
Section 11.10 Original Class B-3 Percentage................................
Section 11.11 Original Class B-4 Percentage................................
Section 11.12 Original Class B-5 Percentage................................
Section 11.13 Original Class B-6 Percentage................................
Section 11.14 Original Class B Principal Balance...........................
Section 11.15 Original Principal Balances of the Classes of Class B

               Certificates................................................
Section 11.16 Original Class B-1 Fractional Interest.......................
Section 11.17 Original Class B-2 Fractional Interest.......................
Section 11.18 Original Class B-3 Fractional Interest.......................
Section 11.19 Original Class B-4 Fractional Interest.......................
Section 11.20 Original Class B-5 Fractional Interest.......................
Section 11.21 Closing Date.................................................
Section 11.22 Right to Purchase............................................
Section 11.23 Wire Transfer Eligibility....................................
Section 11.24 Single Certificate...........................................
Section 11.25 Servicing Fee Rate...........................................
Section 11.26 Master Servicing Fee Rate....................................
Section 11.27 Ambac Contact Person.........................................


<PAGE>






                                    EXHIBITS

      EXHIBIT A-1    -  Form of Face of Class A-1 Certificate
      EXHIBIT A-2    -  Form of Face of Class A-2 Certificate
      EXHIBIT A-3    -  Form of Face of Class A-3 Certificate
      EXHIBIT A-4    -  Form of Face of Class A-4 Certificate
      EXHIBIT A-PO   -  Form of Face of Class A-PO Certificate
      EXHIBIT A-R    -  Form of Face of Class A-R Certificate
      EXHIBIT B-1    -  Form of Face of Class B-1 Certificate
      EXHIBIT B-2    -  Form of Face of Class B-2 Certificate
      EXHIBIT B-3    -  Form of Face of Class B-3 Certificate
      EXHIBIT B-4    -  Form of Face of Class B-4 Certificate
      EXHIBIT B-5    -  Form of Face of Class B-5 Certificate
      EXHIBIT B-6    -  Form of Face of Class B-6 Certificate
      EXHIBIT C      -  Form of Reverse of Series 1999-17 Certificates
      EXHIBIT D      -  Reserved
      EXHIBIT E      -  Custodial Agreement
      EXHIBIT F-1    -  Schedule  of  Mortgage   Loans   Serviced  by  Norwest
                        Mortgage
      EXHIBIT F-2    -  Schedule  of  Mortgage  Loans  Serviced  by  Other
                        Servicers
      EXHIBIT G      -  Request for Release EXHIBIT H - Affidavit  Pursuant
                        to Section  860E(e)(4) of the  Internal  Revenue Code of
                        1986, as amended, and for Non-ERISA Investors
      EXHIBIT I      -  Letter from Transferor of Residual Certificates
      EXHIBIT J      -  Transferee's  Letter  (Class  [A-PO][B-4]  [B-5] [B-6]
                        Certificates)
      EXHIBIT K      -  Transferee's   Letter   (Class   [B-1]   [B-2]   [B-3]
                        Certificates)
      EXHIBIT L      -  Servicing Agreements
      EXHIBIT M      -  Form of Special Servicing Agreement
      EXHIBIT N      -  Policy
      SCHEDULE I     -  Applicable Unscheduled Principal Receipt Period


<PAGE>






            This  Pooling  and  Servicing  Agreement,  dated as of May 26,  1999
executed  by NORWEST  ASSET  SECURITIES  CORPORATION,  as Seller,  NORWEST  BANK
MINNESOTA, NATIONAL ASSOCIATION, as Master Servicer, UNITED STATES TRUST COMPANY
OF NEW YORK, as Trustee and FIRST UNION NATIONAL BANK, as Trust Administrator.

                                WITNESSETH THAT:

            In  consideration of the mutual  agreements  herein  contained,  the
Seller, the Master Servicer,  the Trustee and the Trust  Administrator  agree as
follows:

                                    ARTICLE I

                                   DEFINITIONS

            SECTION 1.01      DEFINITIONS.

            Whenever used herein,  the following  words and phrases,  unless the
context otherwise requires, shall have the meanings specified in this Article.


            Accepted  Master  Servicing  Practices:  Accepted  Master  Servicing
Practices shall consist of the customary and usual master servicing practices of
prudent master servicing  institutions  which service mortgage loans of the same
type as the Mortgage Loans in the  jurisdictions in which the related  Mortgaged
Properties are located,  regardless of the date upon which the related  Mortgage
Loans were originated.

            Adjusted Pool Amount:  With respect to any  Distribution  Date,  the
Cut-Off Date Aggregate  Principal Balance of the Mortgage Loans minus the sum of
(i) all  amounts in respect of  principal  received  in respect of the  Mortgage
Loans  (including,  without  limitation,  amounts received as Monthly  Payments,
Periodic Advances,  Unscheduled  Principal  Receipts and Substitution  Principal
Amounts) and  distributed to Holders of the  Certificates  on such  Distribution
Date and all prior  Distribution  Dates and (ii) the  principal  portion  of all
Realized  Losses (other than Debt Service  Reductions)  incurred on the Mortgage
Loans  from  the  Cut-Off  Date  through  the end of the  month  preceding  such
Distribution Date.

            Adjusted Pool Amount (PO Portion):  With respect to any Distribution
Date,  the sum of the  amounts,  calculated  as  follows,  with  respect  to all
Outstanding  Mortgage  Loans:  the product of (i) the PO Fraction  for each such
Mortgage Loan and (ii) the remainder of (A) the Cut-Off Date  Principal  Balance
of such  Mortgage  Loan  minus  (B) the sum of (x) all  amounts  in  respect  of
principal  received  in  respect  of  such  Mortgage  Loan  (including,  without
limitation, amounts received as Monthly Payments, Periodic Advances, Unscheduled
Principal  Receipts  and  Substitution  Principal  Amounts) and  distributed  to
Holders of the Certificates on such Distribution Date and all prior Distribution
Dates and (y) the  principal  portion of any  Realized  Loss  (other than a Debt
Service Reduction)  incurred on such Mortgage Loan from the Cut-Off Date through
the end of the month preceding such Distribution Date.

            Adjusted  Principal  Balance:  As to any  Distribution  Date and any
Class of Class B Certificates, the greater of (A) zero and (B) (i) the Principal
Balance  of such Class with  respect  to such  Distribution  Date minus (ii) the
Adjustment Amount for such Distribution Date less the Principal Balances for any
Classes of Class B Certificates with higher numerical designations.

            Adjustment Amount: For any Distribution Date, the difference between
(A) the sum of the Class A Principal Balance and Class B Principal Balance as of
the  related  Determination  Date and (B) the sum of (i) the sum of the  Class A
Principal  Balance and Class B Principal  Balance as of the  Determination  Date
succeeding such Distribution  Date, (ii) the principal portion of Excess Special
Hazard Losses, Excess Fraud Losses and Excess Bankruptcy Losses allocated to the
Certificates  with  respect to such  Distribution  Date and (iii) the  aggregate
amount  that  would  have  been  distributed  to all  Classes  as  principal  in
accordance with Section 4.01(a) for such Distribution Date without regard to the
provisos in the  definitions of Class B-1 Optimal  Principal  Amount,  Class B-2
Optimal Principal Amount,  Class B-3 Optimal Principal Amount, Class B-4 Optimal
Principal  Amount,  Class B-5  Optimal  Principal  Amount and Class B-6  Optimal
Principal Amount.

            Aggregate Class A Distribution  Amount: As to any Distribution Date,
the  aggregate  amount  distributable  to the  Classes  of Class A  Certificates
pursuant to Paragraphs  first,  second,  third and fourth of Section  4.01(a) on
such Distribution Date.

            Aggregate Class A Unpaid Interest Shortfall:  As to any Distribution
Date, an amount equal to the sum of the Class A Unpaid  Interest  Shortfalls for
all the Classes of Class A Certificates.

            Aggregate   Current   Bankruptcy   Losses:   With   respect  to  any
Distribution  Date,  the sum of all  Bankruptcy  Losses  incurred  on any of the
Mortgage Loans in the month preceding the month of such Distribution Date.

            Aggregate  Current  Fraud Losses:  With respect to any  Distribution
Date,  the sum of all Fraud Losses  incurred on any of the Mortgage Loans in the
month preceding the month of such Distribution Date.

            Aggregate  Current  Special  Hazard  Losses:  With  respect  to  any
Distribution  Date, the sum of all Special Hazard Losses  incurred on any of the
Mortgage Loans in the month preceding the month of such Distribution Date.

            Aggregate  Foreclosure  Profits:  As to any Distribution Date, the
aggregate  amount of  Foreclosure  Profits with respect to all of the Mortgage
Loans.

            Agreement:   This  Pooling  and   Servicing   Agreement   and  all
amendments and supplements hereto.

            Ambac: Ambac Assurance  Corporation,  a Wisconsin-domiciled  stock
insurance company, or any successor thereto.

            Ambac  Contact  Person:  The  officer  designated  by  the  Master
Servicer to provide  information  to Ambac  pursuant to  Section 4.08(g).  The
initial Ambac Contact Person is appointed in Section 11.27.

            Ambac  Default:  The  existence  and  continuance  of  any  of the
following:

            (a)  Ambac  fails  to make a  payment  required  under a  policy  in
      accordance with its terms;

            (b) Ambac (A) files any petition or commences any case or proceeding
      under  any  provision  or  similar   federal  or  state  law  relating  to
      insolvency, bankruptcy, rehabilitation, liquidation or reorganization, (B)
      makes a general assignment for the benefit of its creditors, or (C) has an
      order for relief  entered  against it under the United  States  Bankruptcy
      code  or  any  similar  federal  or  state  law  relating  to  insolvency,
      bankruptcy,  rehabilitation,  liquidation or reorganization which is final
      and nonappealable; or

            (c) a court of competent  jurisdiction,  the New York  Department of
      Insurance  or other  competent  regulatory  authority  enters a final  and
      nonappealable  order,  judgment  or decree  (1)  appointing  a  custodian,
      trustee, agent or receiver for Ambac or for all or any material portion of
      its property or (2)  authorizing  the taking of possession by a custodian,
      trustee, agent or receiver of Ambac (or the taking of possession of all or
      any material portion of the property of Ambac).

            Applicable Unscheduled Principal Receipt Period: With respect to the
Mortgage Loans serviced by each Servicer and each of Full Unscheduled  Principal
Receipts and Partial Unscheduled  Principal Receipts,  the Unscheduled Principal
Receipt Period  specified on Schedule I hereto,  as amended from time to time by
the Master Servicer pursuant to Section 10.01(b) hereof.

            Authenticating  Agent: Any  authenticating  agent appointed by the
Trust  Administrator  pursuant to  Section 8.11.  There shall  initially be no
Authenticating Agent for the Certificates.

            Available Master Servicer Compensation: As to any Distribution Date,
the sum of (a) the Master Servicing Fee for such Distribution Date, (b) interest
earned  through the business day preceding the applicable  Distribution  Date on
any  Prepayments  in Full remitted to the Master  Servicer and (c) the aggregate
amount of Month End Interest  remitted by the  Servicers to the Master  Servicer
pursuant to the related Servicing Agreements.

            Bankruptcy Code:  The Bankruptcy Code of 1978, as amended.

            Bankruptcy  Loss:  With  respect to any  Mortgage  Loan, a Deficient
Valuation or Debt Service Reduction;  provided,  however, that a Bankruptcy Loss
shall  not be  deemed a  Bankruptcy  Loss  hereunder  so long as the  applicable
Servicer has notified the Master Servicer and the Trust Administrator in writing
that  such  Servicer  is  diligently  pursuing  any  remedies  that may exist in
connection  with the  representations  and warranties made regarding the related
Mortgage  Loan and either (A) the related  Mortgage  Loan is not in default with
regard to payments due  thereunder or (B)  delinquent  payments of principal and
interest  under the related  Mortgage  Loan and any  premiums on any  applicable
primary hazard  insurance  policy and any related escrow  payments in respect of
such  Mortgage  Loan are  being  advanced  on a current  basis by such  Servicer
without giving effect to any Debt Service Reduction.

            Bankruptcy  Loss Amount:  As of any  Distribution  Date prior to the
first  anniversary of the Cut-Off Date,  the  Bankruptcy  Loss Amount will equal
$100,000.00  minus the aggregate amount of Bankruptcy Losses allocated solely to
the Class B Certificates  in accordance  with Section  4.02(a) since the Cut-Off
Date.  As of any  Distribution  Date on or after  the first  anniversary  of the
Cut-Off  Date,  an amount  equal to (1) the  lesser of (a) the  Bankruptcy  Loss
Amount  calculated  as of the close of business on the Business Day  immediately
preceding the most recent  anniversary  of the Cut-Off Date  coinciding  with or
preceding  such  Distribution  Date (the  "Relevant  Anniversary")  and (b) such
lesser amount which,  as determined on the Relevant  Anniversary  will not cause
any rated  Certificates  to be placed on credit  review  status  (other than for
possible  upgrading)  (or,  in the case of the Class A-3  Certificates,  without
giving  effect to the guaranty  provided by Ambac) by either Rating Agency minus
(2) the aggregate  amount of Bankruptcy  Losses  allocated solely to the Class B
Certificates in accordance with Section 4.02(a) since the Relevant  Anniversary.
On and after the Cross-Over Date the Bankruptcy Loss Amount shall be zero.

            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.

            Book-Entry Certificate: Any one of the Class A-1 Certificates, Class
A-2 Certificates and Class A-3 Certificates,  beneficial ownership and transfers
of which shall be evidenced by, and made  through,  book entries by the Clearing
Agency as described in Section 5.01(b).

            Business Day: Any day other than (i) a Saturday or a Sunday, or (ii)
a legal holiday in the City of New York, State of Iowa, State of Maryland, State
of  Minnesota  or  State  of North  Carolina  or  (iii) a day on  which  banking
institutions  in the City of New York, or the State of Iowa,  State of Maryland,
State of Minnesota or State of North Carolina are authorized or obligated by law
or executive order to be closed.

            Certificate:  Any  one  of the  Class A  Certificates  or  Class B
Certificates.

            Certificate   Account:   The   trust   account   established   and
maintained  by the  Master  Servicer  in the name of the  Master  Servicer  on
behalf of the  Trustee  pursuant  to  Section 3.01.  The  Certificate  Account
shall be an Eligible Account.

            Certificate  Register  and  Certificate  Registrar:  Respectively,
the  register  maintained  pursuant  to  and  the  registrar  provided  for in
Section 5.02.  The initial Certificate Registrar is the Trust Administrator.

            Certificateholder  or Holder: The Person in whose name a Certificate
is registered in the Certificate Register,  except that, solely for the purposes
of the  taking  of any  action  under  Articles  VII or  VIII,  any  Certificate
registered  in the name of the  Master  Servicer,  a Servicer  or any  affiliate
thereof shall be deemed not to be outstanding and the Voting Interest  evidenced
thereby  shall not be taken into account in  determining  whether the  requisite
percentage  of  Certificates  necessary  to  effect  any  such  action  has been
obtained.

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

            Class A Certificate:  Any one of the Class A-1  Certificates,  Class
A-2  Certificates,  Class A-3 Certificates,  Class A-4 Certificates,  Class A-PO
Certificates or Class A-R Certificate.

            Class A  Certificateholder:  The  registered  holder  of a Class A
Certificate.

            Class A Distribution  Amount:  As to any  Distribution  Date and any
Class  of  Class A  Certificates  (other  than  the  Class  A-4 and  Class  A-PO
Certificates),  the amount  distributable  to such Class of Class A Certificates
pursuant to Paragraphs first, second and third clause (A) of Section 4.01(a). As
to the Class A-4 Certificates,  the amount  distributable to such Class pursuant
to Paragraph third clause (A) of Section 4.01(a).  As to any  Distribution  Date
and the Class  A-PO  Certificates,  the amount  distributable  to the Class A-PO
Certificates  pursuant  to  Paragraphs  third  clause  (B) and fourth of Section
4.01(a) on such Distribution Date.

            Class A  Fixed  Pass-Through  Rate: As to any  Distribution  Date,
the rate per annum set forth in Section 11.01.

            Class A Interest Accrual Amount:  As to any  Distribution  Date, the
sum of the Interest Accrual Amounts for the Classes of Class A Certificates with
respect to such Distribution Date.

            Class A Interest  Percentage:  As to any  Distribution  Date and any
Class of Class A  Certificates  (other  than the Class A-PO  Certificates),  the
percentage  calculated  by dividing  the Interest  Accrual  Amount of such Class
(determined  without regard to clause (ii) of the definition thereof) by the sum
of (a) the Class A Interest Accrual Amount (determined  without regard to clause
(ii) of the  definition  of each  Interest  Accrual  Amount) and (b) the Premium
Payment  (determined  without regard to clause (ii) of the definition of Premium
Payment).

            Class A Interest  Shortfall  Amount: As to any Distribution Date and
any Class of Class A  Certificates,  any  amount by which the  Interest  Accrual
Amount of such Class with respect to such  Distribution  Date exceeds the amount
distributed  in respect  of such Class on such  Distribution  Date  pursuant  to
Paragraph first of Section 4.01(a).

            Class A  Loss  Denominator:  As  to  any  Determination  Date,  an
amount equal to the Class A Non-PO Principal Balance.

            Class A Loss Percentage:  As to any Determination Date and any Class
of  Class  A  Certificates   (other  than  the  Class  A-PO  Certificates)  then
outstanding, the percentage calculated by dividing the Principal Balance of such
Class by the Class A Loss  Denominator  (determined  without  regard to any such
Principal Balance of any Class of Class A Certificates not then outstanding), in
each case determined as of the preceding Determination Date.

            Class A Non-PO Optimal Amount: As to any Distribution  Date, the sum
for such Distribution Date of (i) the Class A Interest Accrual Amount,  (ii) the
Aggregate Class A Unpaid Interest  Shortfalls,  (iii) the Premium Payment,  (iv)
the  Premium  Unpaid  Shortfall  and (v) the  Class A Non-PO  Optimal  Principal
Amount.

            Class A Non-PO  Optimal  Principal  Amount:  As to any  Distribution
Date, an amount equal to the sum, as to each  Outstanding  Mortgage Loan, of the
product of (x) the Non-PO  Fraction with respect to such Mortgage  Loan, and (y)
the sum of:

            (i) the  Class A  Percentage  of (A) the  principal  portion  of the
Monthly Payment due on the Due Date occurring in the month of such  Distribution
Date on such  Mortgage  Loan,  less (B) if the  Bankruptcy  Loss Amount has been
reduced to zero,  the  principal  portion  of any Debt  Service  Reduction  with
respect to such Mortgage Loan;

            (ii) the Class A Prepayment  Percentage of all Unscheduled Principal
Receipts  that were  received by a Servicer  with respect to such  Mortgage Loan
during the Applicable  Unscheduled  Principal  Receipt  Period  relating to such
Distribution Date for each applicable type of Unscheduled Principal Receipt;

            (iii) the Class A Prepayment  Percentage of the Scheduled  Principal
Balance of such  Mortgage  Loan which,  during the month  preceding the month of
such  Distribution  Date, was repurchased by the Seller pursuant to Section 2.02
or 2.03; and

            (iv) the Class A  Percentage  of the excess of the unpaid  principal
balance of such Mortgage Loan  substituted for a defective  Mortgage Loan during
the month  preceding the month in which such  Distribution  Date occurs over the
unpaid  principal  balance  of such  defective  Mortgage  Loan,  less the amount
allocable  to the  principal  portion  of  any  unreimbursed  Periodic  Advances
previously  made by the applicable  Servicer,  the Master  Servicer or the Trust
Administrator in respect of such defective Mortgage Loan.

            Class A Non-PO Principal Balance: As of any date, an amount equal to
the Class A  Principal  Balance  less the  Principal  Balance  of the Class A-PO
Certificates.

            Class A Non-PO Principal Distribution Amount: As to any Distribution
Date, will be equal to the amount distributed pursuant to Paragraph third clause
(A) of Section 4.01(a).

            Class A Pass-Through  Rate: As to the Class A-1, Class A-2 and Class
A-R  Certificates,  the  Class A Fixed  Pass-Through  Rate.  As to the Class A-3
Certificates,  6.750% per annum.  The Class A-4 and Class A-PO  Certificates are
not entitled to interest and have no Class A Pass-Through Rate.

            Class A  Percentage:  As to any  Distribution  Date  occurring on or
prior to the  Cross-Over  Date,  the lesser of (i) 100% and (ii) the  percentage
obtained by dividing the Class A Non-PO Principal Balance  (determined as of the
Determination Date preceding such Distribution Date) by the Pool Balance (Non-PO
Portion).  As to any  Distribution  Date occurring  subsequent to the Cross-Over
Date,  100% or such  lesser  percentage  which  will  cause  the  Class A Non-PO
Principal  Balance to decline to zero  following the  distribution  made on such
Distribution Date.

            Class A Prepayment  Percentage:  As to any Distribution  Date to and
including the Distribution  Date in May 2004, 100%. As to any Distribution  Date
subsequent to May 2004 to and including the  Distribution  Date in May 2005, the
Class A Percentage  as of such  Distribution  Date plus 70% of the  Subordinated
Percentage as of such Distribution  Date. As to any Distribution Date subsequent
to May 2005 to and  including  the  Distribution  Date in May 2006,  the Class A
Percentage as of such Distribution Date plus 60% of the Subordinated  Percentage
as of such Distribution Date. As to any Distribution Date subsequent to May 2006
to and including the Distribution Date in May 2007, the Class A Percentage as of
such  Distribution  Date  plus  40% of the  Subordinated  Percentage  as of such
Distribution  Date. As to any  Distribution  Date  subsequent to May 2007 to and
including the  Distribution  Date in May 2008, the Class A Percentage as of such
Distribution   Date  plus  20%  of  the  Subordinated   Percentage  as  of  such
Distribution Date. As to any Distribution Date subsequent to May 2008, the Class
A  Percentage  as of such  Distribution  Date.  The  foregoing is subject to the
following:  (i) if the aggregate distribution to Holders of Class A Certificates
on any Distribution Date of the Class A Prepayment  Percentage provided above of
(a) Unscheduled Principal Receipts distributable on such Distribution Date would
reduce the Class A Non-PO  Principal  Balance below zero, the Class A Prepayment
Percentage for such Distribution Date shall be the percentage necessary to bring
the  Class A  Non-PO  Principal  Balance  to zero  and  thereafter  the  Class A
Prepayment Percentage shall be zero and (ii) if the Class A Percentage as of any
Distribution  Date is greater than the Original Class A Percentage,  the Class A
Prepayment Percentage for such Distribution Date shall be 100%.  Notwithstanding
the  foregoing,  with respect to any  Distribution  Date on which the  following
criteria  are not  met,  the  reduction  of the  Class A  Prepayment  Percentage
described in the second  through sixth  sentences of this  definition of Class A
Prepayment  Percentage shall not be applicable with respect to such Distribution
Date. In such event,  the Class A Prepayment  Percentage  for such  Distribution
Date will be determined  in accordance  with the  applicable  provision,  as set
forth in the first through  fifth  sentences  above,  which was actually used to
determine the Class A Prepayment  Percentage for the Distribution Date occurring
in the May preceding such  Distribution  Date (it being  understood that for the
purposes  of the  determination  of the Class A  Prepayment  Percentage  for the
current  Distribution  Date,  the current  Class A Percentage  and  Subordinated
Percentage  shall be utilized).  In order for the  reduction  referred to in the
second  through  sixth   sentences  to  be  applicable,   with  respect  to  any
Distribution  Date  (a)  the  average  outstanding  principal  balance  on  such
Distribution Date and for the preceding five Distribution  Dates on the Mortgage
Loans that were  delinquent  60 days or more  (including  for this  purpose  any
payments  due with  respect to Mortgage  Loans in  foreclosure  and REO Mortgage
Loans)  must be less than 50% of the current  Class B Principal  Balance and (b)
cumulative  Realized  Losses  shall not exceed (1) 30% of the  Original  Class B
Principal  Balance if such  Distribution  Date occurs between and including June
2004 and May 2005 (2) 35% of the  Original  Class B  Principal  Balance  if such
Distribution  Date occurs  between and including June 2005 and May 2006, (3) 40%
of the  Original  Class B  Principal  Balance if such  Distribution  Date occurs
between and including  June 2006 and May 2007,  (4) 45% of the Original  Class B
Principal  Balance if such  Distribution  Date occurs between and including June
2007 and May 2008, and (5) 50% of the Original Class B Principal Balance if such
Distribution  Date  occurs  during  or after  June  2008.  With  respect  to any
Distribution  Date on which the Class A Prepayment  Percentage  is reduced below
the Class A Prepayment  Percentage for the prior  Distribution  Date, the Master
Servicer  shall  certify  to the Trust  Administrator,  based  upon  information
provided  by each  Servicer  as to the  Mortgage  Loans  serviced by it that the
criteria set forth in the preceding sentence are met.

            Class A Principal  Balance:  As of any date,  an amount equal to the
sum of the  Principal  Balances  for  the  Class  A-1  Certificates,  Class  A-2
Certificates,  Class  A-3  Certificates,  Class  A-4  Certificates,  Class  A-PO
Certificates and Class A-R Certificate.

            Class A Unpaid Interest  Shortfall:  As to any Distribution Date and
any Class of Class A Certificates, the amount, if any, by which the aggregate of
the Class A Interest  Shortfall  Amounts  for such Class for prior  Distribution
Dates is in excess of the amounts  distributed in respect of such Class on prior
Distribution Dates pursuant to Paragraph second of Section 4.01(a).

            Class A-1 Certificate:  Any one of the Certificates  executed by the
Trust  Administrator  and  authenticated  by  the  Trust  Administrator  or  the
Authenticating  Agent in  substantially  the form set forth in  Exhibit  A-1 and
Exhibit C hereto.

            Class A-1   Certificateholder:   The   registered   holder   of  a
Class A-1 Certificate.

            Class A-2 Certificate:  Any one of the Certificates  executed by the
Trust  Administrator  and  authenticated  by  the  Trust  Administrator  or  the
Authenticating  Agent in  substantially  the form set forth in  Exhibit  A-2 and
Exhibit C hereto.

            Class A-2   Certificateholder:   The   registered   holder   of  a
Class A-2 Certificate.

            Class A-3 Certificate:  Any one of the Certificates  executed by the
Trust  Administrator  and  authenticated  by  the  Trust  Administrator  or  the
Authenticating  Agent in  substantially  the form set forth in  Exhibit  A-3 and
Exhibit C hereto.

            Class A-3   Certificateholder:   The   registered   holder   of  a
Class A-3 Certificate.

            Class A-3  Distribution  Deficiency:  With  respect to the Class A-3
Certificates  on each  Distribution  Date, the sum of (i) the Class A-3 Interest
Loss Amount for such  Distribution  Date and (ii) the Class A-3  Principal  Loss
Amount for such Distribution.

            Class A-3 Interest Loss Amount:  As to any  Distribution  Date,  the
excess, if any, of (i) the Interest Accrual Amount of the Class A-3 Certificates
(determined without regard to clause (ii) of the definition thereof), net of any
Non-Supported  Interest Shortfalls  allocated to the Class A-3 Certificates that
are covered by the Reserve Fund over (ii) the amount available to be distributed
in respect of the Class A-3 Certificates on such  Distribution  Date pursuant to
Paragraph first of Section 4.01(a).

            Class A-3 Principal Loss Amount:  As to any  Distribution  Date, the
sum of, without  duplication,  (i) the Class A Loss  Percentage of the Class A-3
Certificates of the principal  portion of Realized Losses allocated to the Class
A  Certificates  (other than the Class A-PO  Certificates)  with respect to such
Distribution  Date pursuant to Section 4.02(b) and (ii) any amount  allocated to
the Class  A-3  Certificates  after the  Cross-Over  Date with  respect  to such
Distribution  Date pursuant to the third sentence in the definition of Principal
Balance of the Class A-3 Certificates.

            Class A-4 Certificate:  Any one of the Certificates  executed by the
Trust  Administrator  and  authenticated  by  the  Trust  Administrator  or  the
Authenticating  Agent in  substantially  the form set forth in  Exhibit  A-4 and
Exhibit C hereto.

            Class A-4   Certificateholder:   The   registered   holder   of  a
Class A-4 Certificate.

            Class A-PO Certificate:  Any one of the Certificates executed by the
Trust  Administrator  and  authenticated  by  the  Trust  Administrator  or  the
Authenticating  Agent in  substantially  the form set forth in Exhibit  A-PO and
Exhibit C hereto.

            Class A-PO   Certificateholder:   The   registered   holder  of  a
Class A-PO Certificate.

            Class A-PO Deferred Amount:  For any Distribution  Date prior to the
Cross-Over  Date, the difference  between (A) the sum of (x) the amount by which
the sum of the Class A-PO Optimal Principal  Amounts for all prior  Distribution
Dates exceeded the amounts  distributed on the Class A-PO  Certificates  on such
prior  Distribution  Dates  pursuant to  Paragraph  third  clause (B) of Section
4.01(a)  and (y) the sum of the product for each  Discount  Mortgage  Loan which
became  a  Liquidated  Loan  at any  time on or  prior  to the  last  day of the
applicable  Unscheduled  Principal  Receipt Period for the current  Distribution
Date of (a) the PO Fraction for such  Discount  Mortgage  Loan and (b) an amount
equal to the principal  portion of Realized Losses (other than Bankruptcy Losses
due to Debt Service  Reductions)  incurred  with respect to such  Mortgage  Loan
other  than  Excess  Special  Hazard  Losses,  Excess  Fraud  Losses  and Excess
Bankruptcy Losses and (B) amounts  distributed on the Class A-PO Certificates on
prior Distribution Dates pursuant to Paragraph fourth of Section 4.01(a). On and
after the  Cross-Over  Date,  the Class A-PO  Deferred  Amount will be zero.  No
interest will accrue on any Class A-PO Deferred Amount.

            Class A-PO Optimal Principal Amount: As to any Distribution Date, an
amount equal to the sum as to each Outstanding  Mortgage Loan, of the product of
(x) the PO Fraction with respect to such Mortgage Loan and (y) the sum of:

            (i) (A) the principal  portion of the Monthly Payment due on the Due
Date  occurring in the month of such  Distribution  Date on such Mortgage  Loan,
less (B) if the  Bankruptcy  Loss Amount has been reduced to zero, the principal
portion of any Debt Service Reduction with respect to such Mortgage Loan;

            (ii) all  Unscheduled  Principal  Receipts  that were  received by a
Servicer with respect to such Mortgage  Loan during the  Applicable  Unscheduled
Principal  Receipt Period relating to such Distribution Date for each applicable
type of Unscheduled Principal Receipt;

            (iii) the Scheduled Principal Balance of each Mortgage Loan that was
repurchased by the Seller during such  preceding  month pursuant to Section 2.02
or 2.03;

            (iv) the excess of the unpaid principal balance of such Mortgage
Loan  substituted  for a defective  Mortgage Loan during the month preceding the
month in which such  Distribution  Date occurs over the unpaid principal balance
of such  defective  Mortgage  Loan,  less the amount  allocable to the principal
portion of any unreimbursed  Periodic Advances previously made by the applicable
Servicer,  the Master  Servicer  or the Trust  Administrator  in respect of such
defective Mortgage Loan.

            Class  A-R  Certificate:  The  Certificate  executed  by  the  Trust
Administrator and authenticated by the Trust Administrator or the Authenticating
Agent in substantially the form set forth in Exhibit A-R and Exhibit C hereto.

            Class A-R   Certificateholder:   The  registered   holder  of  the
Class A-R Certificate.

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

            Class B  Certificateholder:  The  registered  holder  of a Class B
Certificate.

            Class B  Distribution  Amount:  Any of the  Class B-1,  Class B-2,
Class B-3, Class B-4, Class B-5 or Class B-6 Distribution Amounts.

            Class B Interest Accrual Amount:  As to any  Distribution  Date, the
sum of the Interest Accrual Amounts for the Classes of Class B Certificates with
respect to such Distribution Date.

            Class B Interest  Percentage:  As to any  Distribution  Date and any
Class of  Class B  Certificates,  the  percentage  calculated  by  dividing  the
Interest Accrual Amount of such Class (determined  without regard to clause (ii)
of the definition  thereof) by the Class B Interest  Accrual Amount  (determined
without  regard  to  clause  (ii) of the  definition  of each  Interest  Accrual
Amount).

            Class B Interest  Shortfall  Amount:  Any of the Class B-1  Interest
Shortfall  Amount,  Class B-2  Interest  Shortfall  Amount,  Class B-3  Interest
Shortfall  Amount,  Class B-4  Interest  Shortfall  Amount,  Class B-5  Interest
Shortfall Amount or Class B-6 Interest Shortfall Amount.

            Class B Loss Percentage:  As to any Determination Date and any Class
of Class B Certificates then outstanding,  the percentage calculated by dividing
the  Principal  Balance  of  such  Class  B by the  Class  B  Principal  Balance
(determined  without  regard to any  Principal  Balance  of any Class of Class B
Certificates not then outstanding),  in each case determined as of the preceding
Determination Date.

            Class B  Pass-Through  Rate: As to any Distribution  Date,  6.250%
per annum.

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

            Class B  Prepayment  Percentage:  Any of the Class B-1  Prepayment
Percentage,  Class B-2 Prepayment Percentage, Class B-3 Prepayment Percentage,
Class B-4 Prepayment Percentage,  Class B-5 Prepayment Percentage or Class B-6
Prepayment Percentage.

            Class B Principal  Balance:  As of any date,  an amount equal to the
sum of the Class B-1 Principal Balance,  Class B-2 Principal Balance,  Class B-3
Principal Balance,  Class B-4 Principal Balance, Class B-5 Principal Balance and
Class B-6 Principal Balance.

            Class B Unpaid  Interest  Shortfall:  Any of the  Class  B-1  Unpaid
Interest  Shortfall,  Class B-2  Unpaid  Interest  Shortfall,  Class B-3  Unpaid
Interest  Shortfall,  Class B-4  Unpaid  Interest  Shortfall,  Class B-5  Unpaid
Interest Shortfall or Class B-6 Unpaid Interest Shortfall.

            Class B-1 Certificate:  Any one of the Certificates  executed by the
Trust  Administrator  and  authenticated  by  the  Trust  Administrator  or  the
Authenticating  Agent in  substantially  the form set forth in  Exhibit  B-1 and
Exhibit C hereto.

            Class B-1   Certificateholder:   The   registered   holder   of  a
Class B-1 Certificate.

            Class B-1  Distribution  Amount:  As to any  Distribution  Date, any
amount  distributable to the Holders of the Class B-1  Certificates  pursuant to
Paragraphs fifth, sixth and seventh of Section 4.01(a).

            Class B-1 Interest  Shortfall Amount:  As to any Distribution  Date,
any amount by which the Interest  Accrual  Amount of the Class B-1  Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-1  Certificates on such  Distribution  Date pursuant to Paragraph
fifth of Section 4.01(a).

            Class B-1 Optimal Principal Amount: As to any Distribution  Date, an
amount equal to the sum, as to each Outstanding Mortgage Loan, of the product of
(x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

            (i)  the Class B-1 Percentage  of (A) the  principal  portion of the
Monthly Payment due on the Due Date occurring in the month of such  Distribution
Date on such  Mortgage  Loan,  less (B) if the  Bankruptcy  Loss Amount has been
reduced to zero,  the  principal  portion  of any Debt  Service  Reduction  with
respect to such Mortgage Loan;

            (ii)  the  Class  B-1  Prepayment   Percentage  of  all  Unscheduled
Principal  Receipts  that were  received  by a  Servicer  with  respect  to such
Mortgage  Loan  during  the  Applicable  Unscheduled  Principal  Receipt  Period
relating  to such  Distribution  Date for each  applicable  type of  Unscheduled
Principal Receipt;

            (iii) the Class B-1 Prepayment Percentage of the Scheduled Principal
Balance of such  Mortgage  Loan which,  during the month  preceding the month of
such  Distribution  Date, was repurchased by the Seller pursuant to Section 2.02
or 2.03; and

            (iv) the Class B-1 Percentage of the excess of the unpaid  principal
balance of such Mortgage Loan  substituted for a defective  Mortgage Loan during
the month  preceding the month in which such  Distribution  Date occurs over the
unpaid  principal  balance  of such  defective  Mortgage  Loan,  less the amount
allocable  to the  principal  portion  of  any  unreimbursed  Periodic  Advances
previously  made by the applicable  Servicer,  the Master  Servicer or the Trust
Administrator in respect of such defective Mortgage Loan;

provided,  however,  that if an Optimal  Adjustment Event occurs with respect to
such Class and such  Distribution  Date, the Class B-1 Optimal  Principal Amount
will equal the lesser of (A) the Class B-1 Optimal  Principal Amount  calculated
as described in the preceding  provisions and (B) the Adjusted Principal Balance
for the Class B-1 Certificates.

            Class B-1 Percentage:  As to any  Distribution  Date, the percentage
calculated by multiplying the Subordinated Percentage by either (i) if any Class
B Certificates  (other than the Class B-1  Certificates) are eligible to receive
principal  distributions  for such  Distribution Date in accordance with Section
4.01(d),  a fraction,  the numerator of which is the Class B-1 Principal Balance
(determined as of the Determination  Date preceding such Distribution  Date) and
the denominator of which is the sum of the Principal  Balances of the Classes of
Class B  Certificates  eligible  to  receive  principal  distributions  for such
Distribution  Date in accordance  with the provisions of Section 4.01(d) or (ii)
except  as set  forth in  Section  4.01(d)(ii),  in the  event  that the Class B
Certificates (other than the Class B-1 Certificates) are not eligible to receive
distributions of principal in accordance with Section 4.01(d)(i), one.

            Class B-1 Prepayment  Percentage:  As to any Distribution  Date, the
percentage  calculated by multiplying the Subordinated  Prepayment Percentage by
either (i) if any Class B Certificates  (other than the Class B-1  Certificates)
are eligible to receive  principal  distributions  for such Distribution Date in
accordance with Section 4.01(d), a fraction, the numerator of which is the Class
B-1 Principal Balance  (determined as of the  Determination  Date preceding such
Distribution  Date)  and the  denominator  of which is the sum of the  Principal
Balances of the Classes of Class B  Certificates  eligible to receive  principal
distributions  for such  Distribution  Date in accordance with the provisions of
Section 4.01(d) or (ii) except as set forth in Section 4.01(d)(ii), in the event
that the Class B Certificates  (other than the Class B-1  Certificates)  are not
eligible to receive  distributions  of  principal  in  accordance  with  Section
4.01(d)(i), one.

            Class B-1 Principal Balance: As to the first Determination Date, the
Original Class B-1 Principal Balance.  As of any subsequent  Determination Date,
the lesser of (i) the Original  Class B-1 Principal  Balance less the sum of (a)
all amounts  previously  distributed in respect of the Class B-1 Certificates on
prior  Distribution  Dates (A) pursuant to Paragraph  seventh of Section 4.01(a)
and (B) as a  result  of a  Principal  Adjustment  and (b) the  Realized  Losses
allocated through such Determination Date to the Class B-1 Certificates pursuant
to  Section  4.02(b)  and (ii) the  Adjusted  Pool  Amount  as of the  preceding
Distribution  Date less the Class A Principal  Balance as of such  Determination
Date.

            Class B-1 Unpaid Interest  Shortfall:  As to any Distribution  Date,
the amount,  if any, by which the aggregate of the Class B-1 Interest  Shortfall
Amounts for prior Distribution Dates is in excess of the amounts  distributed in
respect of the Class B-1  Certificates on prior  Distribution  Dates pursuant to
Paragraph sixth of Section 4.01(a).

            Class B-2 Certificate:  Any one of the Certificates  executed by the
Trust  Administrator  and  authenticated  by  the  Trust  Administrator  or  the
Authenticating  Agent in  substantially  the form set forth in  Exhibit  B-2 and
Exhibit C hereto.

            Class B-2   Certificateholder:   The   registered   holder   of  a
Class B-2 Certificate.

            Class B-2  Distribution  Amount:  As to any  Distribution  Date, any
amount  distributable to the Holders of the Class B-2  Certificates  pursuant to
Paragraphs eighth, ninth and tenth of Section 4.01(a).

            Class B-2 Interest  Shortfall Amount:  As to any Distribution  Date,
any amount by which the Interest  Accrual  Amount of the Class B-2  Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-2  Certificates on such  Distribution  Date pursuant to Paragraph
eighth of Section 4.01(a).

            Class B-2 Optimal Principal Amount: As to any Distribution  Date, an
amount equal to the sum, as to each Outstanding Mortgage Loan, of the product of
(x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

            (i)  the  Class B-2 Percentage of (A) the  principal  portion of the
Monthly Payment due on the Due Date occurring in the month of such  Distribution
Date on such  Mortgage  Loan,  less (B) if the  Bankruptcy  Loss Amount has been
reduced to zero,  the  principal  portion  of any Debt  Service  Reduction  with
respect to such Mortgage Loan;

            (ii)  the  Class  B-2  Prepayment   Percentage  of  all  Unscheduled
Principal  Receipts  that were  received  by a  Servicer  with  respect  to such
Mortgage  Loan  during  the  Applicable  Unscheduled  Principal  Receipt  Period
relating  to such  Distribution  Date for each  applicable  type of  Unscheduled
Principal Receipt;

            (iii) the Class B-2 Prepayment Percentage of the Scheduled Principal
Balance of such  Mortgage  Loan which,  during the month  preceding the month of
such  Distribution  Date, was repurchased by the Seller pursuant to Section 2.02
or 2.03; and

            (iv) the Class B-2 Percentage of the excess of the unpaid  principal
balance of such Mortgage Loan  substituted for a defective  Mortgage Loan during
the month  preceding the month in which such  Distribution  Date occurs over the
unpaid  principal  balance  of such  defective  Mortgage  Loan,  less the amount
allocable  to the  principal  portion  of  any  unreimbursed  Periodic  Advances
previously  made by the applicable  Servicer,  the Master  Servicer or the Trust
Administrator in respect of such defective Mortgage Loan;

provided,  however,  that if an Optimal  Adjustment Event occurs with respect to
such Class and such  Distribution  Date, the Class B-2 Optimal  Principal Amount
will equal the lesser of (A) the Class B-2 Optimal  Principal Amount  calculated
as described in the preceding  provisions and (B) the Adjusted Principal Balance
for the Class B-2 Certificates.

            Class B-2 Percentage:  As to any  Distribution  Date,  except as set
forth in the next  sentence,  the percentage  calculated by multiplying  (i) the
Subordinated  Percentage by (ii) a fraction, the numerator of which is the Class
B-2 Principal Balance  (determined as of the  Determination  Date preceding such
Distribution  Date)  and the  denominator  of which is the sum of the  Principal
Balances of the Classes of Class B  Certificates  eligible to receive  principal
distributions  for such  Distribution  Date in accordance with the provisions of
Section 4.01(d).  Except as set forth in Section 4.01(d)(ii),  in the event that
the  Class  B-2  Certificates  are not  eligible  to  receive  distributions  of
principal in accordance  with Section  4.01(d)(i),  the Class B-2 Percentage for
such Distribution Date will be zero.

            Class B-2 Prepayment Percentage: As to any Distribution Date, except
as set forth in the next sentence,  the percentage calculated by multiplying (i)
the  Subordinated  Prepayment  Percentage  by (ii) a fraction,  the numerator of
which is the Class B-2 Principal  Balance  (determined  as of the  Determination
Date preceding such  Distribution  Date) and the denominator of which is the sum
of the  Principal  Balances of the Classes of Class B  Certificates  eligible to
receive  principal  distributions  for such Distribution Date in accordance with
the provisions of Section 4.01(d).  Except as set forth in Section  4.01(d)(ii),
in the  event  that the Class  B-2  Certificates  are not  eligible  to  receive
distributions of principal in accordance with Section 4.01(d)(i),  the Class B-2
Prepayment Percentage for such Distribution Date will be zero.

            Class B-2 Principal Balance: As to the first Determination Date, the
Original Class B-2 Principal Balance.  As of any subsequent  Determination Date,
the lesser of (i) the Original  Class B-2 Principal  Balance less the sum of (a)
all amounts  previously  distributed in respect of the Class B-2 Certificates on
prior  Distribution Dates (A) pursuant to Paragraph tenth of Section 4.01(a) and
(B) as a result of a Principal  Adjustment and (b) the Realized Losses allocated
through  such  Determination  Date to the Class  B-2  Certificates  pursuant  to
Section  4.02(b)  and  (ii)  the  Adjusted  Pool  Amount  as  of  the  preceding
Distribution  Date less the sum of the Class A  Principal  Balance and the Class
B-1 Principal Balance as of such Determination Date.

            Class B-2 Unpaid Interest  Shortfall:  As to any Distribution  Date,
the amount,  if any, by which the aggregate of the Class B-2 Interest  Shortfall
Amounts for prior Distribution Dates is in excess of the amounts  distributed in
respect of the Class B-2  Certificates on prior  Distribution  Dates pursuant to
Paragraph ninth of Section 4.01(a).

            Class B-3 Certificate:  Any one of the Certificates  executed by the
Trust  Administrator  and  authenticated  by  the  Trust  Administrator  or  the
Authenticating  Agent in  substantially  the form set forth in  Exhibit  B-3 and
Exhibit C hereto.

            Class B-3   Certificateholder:   The   registered   holder   of  a
Class B-3 Certificate.

            Class B-3  Distribution  Amount:  As to any  Distribution  Date, any
amount  distributable to the Holders of the Class B-3  Certificates  pursuant to
Paragraphs eleventh, twelfth and thirteenth of Section 4.01(a).

            Class B-3 Interest  Shortfall Amount:  As to any Distribution  Date,
any amount by which the Interest  Accrual  Amount of the Class B-3  Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-3  Certificates on such  Distribution  Date pursuant to Paragraph
eleventh of Section 4.01(a).

            Class B-3 Optimal Principal Amount: As to any Distribution  Date, an
amount equal to the sum, as to each Outstanding Mortgage Loan, of the product of
(x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

              (i) the Class B-3  Percentage of (A) the principal  portion of the
Monthly Payment due on the Due Date occurring in the month of such  Distribution
Date on such  Mortgage  Loan,  less (B) if the  Bankruptcy  Loss Amount has been
reduced to zero,  the  principal  portion  of any Debt  Service  Reduction  with
respect to such Mortgage Loan;

               (ii) the  Class  B-3  Prepayment  Percentage  of all  Unscheduled
Principal  Receipts  that were  received  by a  Servicer  with  respect  to such
Mortgage  Loan  during  the  Applicable  Unscheduled  Principal  Receipt  Period
relating  to such  Distribution  Date for each  applicable  type of  Unscheduled
Principal Receipt;

               (iii)  the  Class  B-3  Prepayment  Percentage  of the  Scheduled
Principal  Balance of such Mortgage Loan which,  during the month  preceding the
month of such  Distribution  Date,  was  repurchased  by the Seller  pursuant to
Section 2.02 or 2.03; and

               (iv)  the  Class  B-3  Percentage  of the  excess  of the  unpaid
principal  balance of such Mortgage Loan  substituted  for a defective  Mortgage
Loan during the month preceding the month in which such Distribution Date occurs
over the unpaid  principal  balance of such defective  Mortgage  Loan,  less the
amount allocable to the principal portion of any unreimbursed  Periodic Advances
previously  made by the applicable  Servicer,  the Master  Servicer or the Trust
Administrator in respect of such defective Mortgage Loan;

provided,  however,  that if an Optimal  Adjustment Event occurs with respect to
such Class and such  Distribution  Date, the Class B-3 Optimal  Principal Amount
will equal the lesser of (A) the Class B-3 Optimal  Principal Amount  calculated
as described in the preceding  provisions and (B) the Adjusted Principal Balance
for the Class B-3 Certificates.

            Class B-3 Percentage:  As to any  Distribution  Date,  except as set
forth in the next  sentence,  the percentage  calculated by multiplying  (i) the
Subordinated  Percentage by (ii) a fraction, the numerator of which is the Class
B-3 Principal Balance  (determined as of the  Determination  Date preceding such
Distribution  Date)  and the  denominator  of which is the sum of the  Principal
Balances of the Classes of Class B  Certificates  eligible to receive  principal
distributions  for such  Distribution  Date in accordance with the provisions of
Section 4.01(d).  Except as set forth in Section 4.01(d)(ii),  in the event that
the  Class  B-3  Certificates  are not  eligible  to  receive  distributions  of
principal in accordance  with Section  4.01(d)(i),  the Class B-3 Percentage for
such Distribution Date will be zero.

            Class B-3 Prepayment Percentage: As to any Distribution Date, except
as set forth in the next sentence,  the percentage calculated by multiplying (i)
the  Subordinated  Prepayment  Percentage  by (ii) a fraction,  the numerator of
which is the Class B-3 Principal  Balance  (determined  as of the  Determination
Date preceding such  Distribution  Date) and the denominator of which is the sum
of the  Principal  Balances of the Classes of Class B  Certificates  eligible to
receive  principal  distributions  for such Distribution Date in accordance with
the provisions of Section 4.01(d).  Except as set forth in Section  4.01(d)(ii),
in the  event  that the Class  B-3  Certificates  are not  eligible  to  receive
distributions of principal in accordance with Section 4.01(d)(i),  the Class B-3
Prepayment Percentage for such Distribution Date will be zero.

            Class B-3 Principal Balance: As to the first Determination Date, the
Original Class B-3 Principal Balance.  As of any subsequent  Determination Date,
the lesser of (i) the Original  Class B-3 Principal  Balance less the sum of (a)
all amounts  previously  distributed in respect of the Class B-3 Certificates on
prior Distribution Dates (A) pursuant to Paragraph thirteenth of Section 4.01(a)
and (B) as a  result  of a  Principal  Adjustment  and (b) the  Realized  Losses
allocated through such Determination Date to the Class B-3 Certificates pursuant
to  Section  4.02(b)  and (ii) the  Adjusted  Pool  Amount  as of the  preceding
Distribution Date less the sum of the Class A Principal  Balance,  the Class B-1
Principal Balance and the Class B-2 Principal  Balance as of such  Determination
Date.

            Class B-3 Unpaid Interest  Shortfall:  As to any Distribution  Date,
the amount,  if any, by which the aggregate of the Class B-3 Interest  Shortfall
Amounts for prior Distribution Dates is in excess of the amounts  distributed in
respect of the Class B-3  Certificates on prior  Distribution  Dates pursuant to
Paragraph twelfth of Section 4.01(a).

            Class B-4 Certificate:  Any one of the Certificates  executed by the
Trust  Administrator  and  authenticated  by  the  Trust  Administrator  or  the
Authenticating  Agent in  substantially  the form set forth in  Exhibit  B-4 and
Exhibit C hereto.

            Class B-4   Certificateholder:   The   registered   holder   of  a
Class B-4 Certificate.

            Class B-4  Distribution  Amount:  As to any  Distribution  Date, any
amount  distributable to the Holders of the Class B-4  Certificates  pursuant to
Paragraphs fourteenth, fifteenth, and sixteenth of Section 4.01(a).

            Class B-4 Interest  Shortfall Amount:  As to any Distribution  Date,
any amount by which the Interest  Accrual  Amount of the Class B-4  Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-4  Certificates on such  Distribution  Date pursuant to Paragraph
fourteenth of Section 4.01(a).

            Class B-4 Optimal Principal Amount: As to any Distribution  Date, an
amount equal to the sum, as to each Outstanding Mortgage Loan, of the product of
(x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

              (i) the Class B-4  Percentage of (A) the principal  portion of the
Monthly Payment due on the Due Date occurring in the month of such  Distribution
Date on such  Mortgage  Loan,  less (B) if the  Bankruptcy  Loss Amount has been
reduced to zero,  the  principal  portion  of any Debt  Service  Reduction  with
respect to such Mortgage Loan;

              (ii) the  Class  B-4  Prepayment  Percentage  of all  Unscheduled
Principal  Receipts  that were  received  by a  Servicer  with  respect  to such
Mortgage  Loan  during  the  Applicable  Unscheduled  Principal  Receipt  Period
relating  to such  Distribution  Date for each  applicable  type of  Unscheduled
Principal Receipt;

              (iii)  the  Class  B-4  Prepayment  Percentage  of the  Scheduled
Principal  Balance of such Mortgage Loan which,  during the month  preceding the
month of such  Distribution  Date,  was  repurchased  by the Seller  pursuant to
Section 2.02 or 2.03; and

              (iv)  the  Class  B-4  Percentage  of the  excess  of the  unpaid
principal  balance of such Mortgage Loan  substituted  for a defective  Mortgage
Loan during the month preceding the month in which such Distribution Date occurs
over the unpaid  principal  balance of such defective  Mortgage  Loan,  less the
amount allocable to the principal portion of any unreimbursed  Periodic Advances
previously  made by the applicable  Servicer,  the Master  Servicer or the Trust
Administrator in respect of such defective Mortgage Loan;

provided,  however,  that if an Optimal  Adjustment Event occurs with respect to
such Class and such  Distribution  Date, the Class B-4 Optimal  Principal Amount
will equal the lesser of (A) the Class B-4 Optimal  Principal Amount  calculated
as described in the preceding  provisions and (B) the Adjusted Principal Balance
for the Class B-4 Certificates.

            Class B-4 Percentage:  As to any  Distribution  Date,  except as set
forth in the next  sentence,  the percentage  calculated by multiplying  (i) the
Subordinated  Percentage by (ii) a fraction, the numerator of which is the Class
B-4 Principal Balance  (determined as of the  Determination  Date preceding such
Distribution  Date)  and the  denominator  of which is the sum of the  Principal
Balances of the Classes of Class B  Certificates  eligible to receive  principal
distributions  for such  Distribution  Date in accordance with the provisions of
Section 4.01(d).  Except as set forth in Section 4.01(d)(ii),  in the event that
the  Class  B-4  Certificates  are not  eligible  to  receive  distributions  of
principal in accordance  with Section  4.01(d)(i),  the Class B-4 Percentage for
such Distribution Date will be zero.

            Class B-4 Prepayment Percentage: As to any Distribution Date, except
as set forth in the next sentence,  the percentage calculated by multiplying (i)
the  Subordinated  Prepayment  Percentage  by (ii) a fraction,  the numerator of
which is the Class B-4 Principal  Balance  (determined  as of the  Determination
Date preceding such  Distribution  Date) and the denominator of which is the sum
of the  Principal  Balances of the Classes of Class B  Certificates  eligible to
receive  principal  distributions  for such Distribution Date in accordance with
the provisions of Section 4.01(d).  Except as set forth in Section  4.01(d)(ii),
in the  event  that the Class  B-4  Certificates  are not  eligible  to  receive
distributions of principal in accordance with Section 4.01(d)(i),  the Class B-4
Prepayment Percentage for such Distribution Date will be zero.

            Class B-4 Principal Balance: As to the first Determination Date, the
Original Class B-4 Principal Balance.  As of any subsequent  Determination Date,
the lesser of (i) the Original  Class B-4 Principal  Balance less the sum of (a)
all amounts  previously  distributed in respect of the Class B-4 Certificates on
prior Distribution Dates (A) pursuant to Paragraph  sixteenth of Section 4.01(a)
and (B) as a  result  of a  Principal  Adjustment  and (b) the  Realized  Losses
allocated through such Determination Date to the Class B-4 Certificates pursuant
to  Section  4.02(b)  and (ii) the  Adjusted  Pool  Amount  as of the  preceding
Distribution Date less the sum of the Class A Principal  Balance,  the Class B-1
Principal  Balance,  the Class B-2 Principal Balance and the Class B-3 Principal
Balance as of such Determination Date.

            Class B-4 Unpaid Interest  Shortfall:  As to any Distribution  Date,
the amount,  if any, by which the aggregate of the Class B-4 Interest  Shortfall
Amounts for prior Distribution Dates is in excess of the amounts  distributed in
respect of the Class B-4  Certificates on prior  Distribution  Dates pursuant to
Paragraph fifteenth of Section 4.01(a).

            Class B-5 Certificate:  Any one of the Certificates  executed by the
Trust  Administrator  and  authenticated  by  the  Trust  Administrator  or  the
Authenticating  Agent in  substantially  the form set forth in  Exhibit  B-5 and
Exhibit C hereto.

            Class B-5   Certificateholder:   The   registered   holder   of  a
Class B-5 Certificate.

            Class B-5  Distribution  Amount:  As to any  Distribution  Date, any
amount  distributable to the Holders of the Class B-5  Certificates  pursuant to
Paragraphs seventeenth, eighteenth, and nineteenth of Section 4.01(a).

            Class B-5 Interest  Shortfall Amount:  As to any Distribution  Date,
any amount by which the Interest  Accrual  Amount of the Class B-5  Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-5  Certificates on such  Distribution  Date pursuant to Paragraph
seventeenth of Section 4.01(a).

            Class B-5 Optimal Principal Amount: As to any Distribution  Date, an
amount equal to the sum, as to each Outstanding Mortgage Loan, of the product of
(x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

              (i) the Class B-5  Percentage of (A) the principal  portion of the
Monthly Payment due on the Due Date occurring in the month of such  Distribution
Date on such  Mortgage  Loan,  less (B) if the  Bankruptcy  Loss Amount has been
reduced to zero,  the  principal  portion  of any Debt  Service  Reduction  with
respect to such Mortgage Loan;

              (ii) the  Class  B-5  Prepayment  Percentage  of all  Unscheduled
Principal  Receipts  that were  received  by a  Servicer  with  respect  to such
Mortgage  Loan  during  the  Applicable  Unscheduled  Principal  Receipt  Period
relating  to such  Distribution  Date for each  applicable  type of  Unscheduled
Principal Receipt;

               (iii)  the  Class  B-5  Prepayment  Percentage  of the  Scheduled
Principal  Balance of such Mortgage Loan which,  during the month  preceding the
month of such  Distribution  Date,  was  repurchased  by the Seller  pursuant to
Section 2.02 or 2.03; and

               (iv)  the  Class  B-5  Percentage  of the  excess  of the  unpaid
principal  balance of such Mortgage Loan  substituted  for a defective  Mortgage
Loan during the month preceding the month in which such Distribution Date occurs
over the unpaid  principal  balance of such defective  Mortgage  Loan,  less the
amount allocable to the principal portion of any unreimbursed  Periodic Advances
previously  made by the applicable  Servicer,  the Master  Servicer or the Trust
Administrator in respect of such defective Mortgage Loan;

provided,  however,  that if an Optimal  Adjustment Event occurs with respect to
such Class and such  Distribution  Date, the Class B-5 Optimal  Principal Amount
will equal the lesser of (A) the Class B-5 Optimal  Principal Amount  calculated
as described in the preceding  provisions and (B) the Adjusted Principal Balance
for the Class B-5 Certificates.

            Class B-5 Percentage:  As to any  Distribution  Date,  except as set
forth in the next  sentence,  the percentage  calculated by multiplying  (i) the
Subordinated  Percentage by (ii) a fraction, the numerator of which is the Class
B-5 Principal Balance  (determined as of the  Determination  Date preceding such
Distribution  Date)  and the  denominator  of which is the sum of the  Principal
Balances of the Classes of Class B  Certificates  eligible to receive  principal
distributions  for such  Distribution  Date in accordance with the provisions of
Section 4.01(d).  Except as set forth in Section 4.01(d)(ii),  in the event that
the  Class  B-5  Certificates  are not  eligible  to  receive  distributions  of
principal in accordance  with Section  4.01(d)(i),  the Class B-5 Percentage for
such Distribution Date will be zero.

            Class B-5 Prepayment Percentage: As to any Distribution Date, except
as set forth in the next sentence,  the percentage calculated by multiplying (i)
the  Subordinated  Prepayment  Percentage  by (ii) a fraction,  the numerator of
which is the Class B-5 Principal  Balance  (determined  as of the  Determination
Date preceding such  Distribution  Date) and the denominator of which is the sum
of the  Principal  Balances of the Classes of Class B  Certificates  eligible to
receive  principal  distributions  for such Distribution Date in accordance with
the provisions of Section 4.01(d).  Except as set forth in Section  4.01(d)(ii),
in the  event  that the Class  B-5  Certificates  are not  eligible  to  receive
distributions of principal in accordance with Section 4.01(d)(i),  the Class B-5
Prepayment Percentage for such Distribution Date will be zero.

            Class B-5 Principal Balance: As to the first Determination Date, the
Original Class B-5 Principal Balance.  As of any subsequent  Determination Date,
the lesser of (i) the Original  Class B-5 Principal  Balance less the sum of (a)
all amounts  previously  distributed in respect of the Class B-5 Certificates on
prior Distribution Dates (A) pursuant to Paragraph nineteenth of Section 4.01(a)
and (B) as a  result  of a  Principal  Adjustment  and (b) the  Realized  Losses
allocated through such Determination Date to the Class B-5 Certificates pursuant
to  Section  4.02(b)  and (ii) the  Adjusted  Pool  Amount  as of the  preceding
Distribution Date less the sum of the Class A Principal  Balance,  the Class B-1
Principal  Balance,  the Class B-2  Principal  Balance,  the Class B-3 Principal
Balance and the Class B-4 Principal Balance as of such Determination Date.

            Class B-5 Unpaid Interest  Shortfall:  As to any Distribution  Date,
the amount,  if any, by which the aggregate of the Class B-5 Interest  Shortfall
Amounts for prior Distribution Dates is in excess of the amounts  distributed in
respect of the Class B-5  Certificates on prior  Distribution  Dates pursuant to
Paragraph eighteenth of Section 4.01(a).

            Class B-6 Certificate:  Any one of the Certificates  executed by the
Trust  Administrator  and  authenticated  by  the  Trust  Administrator  or  the
Authenticating  Agent in  substantially  the form set forth in  Exhibit  B-6 and
Exhibit C hereto.

            Class B-6   Certificateholder:   The   registered   holder   of  a
Class B-6 Certificate.

            Class B-6  Distribution  Amount:  As to any  Distribution  Date, any
amount  distributable to the Holders of the Class B-6  Certificates  pursuant to
Paragraphs twentieth, twenty-first and twenty-second of Section 4.01(a).

            Class B-6 Interest  Shortfall Amount:  As to any Distribution  Date,
any amount by which the Interest  Accrual  Amount of the Class B-6  Certificates
with respect to such Distribution Date exceeds the amount distributed in respect
of the Class B-6  Certificates on such  Distribution  Date pursuant to Paragraph
twentieth of Section 4.01(a).

            Class B-6 Optimal Principal Amount: As to any Distribution  Date, an
amount equal to the sum, as to each Outstanding Mortgage Loan, of the product of
(x) the Non-PO Fraction with respect to such Mortgage Loan and (y) the sum of:

            (i) the Class B-6  Percentage  of (A) the  principal  portion of the
Monthly Payment due on the Due Date occurring in the month of such  Distribution
Date on such  Mortgage  Loan,  less (B) if the  Bankruptcy  Loss Amount has been
reduced to zero,  the  principal  portion  of any Debt  Service  Reduction  with
respect to such Mortgage Loan;

            (ii)  the  Class  B-6  Prepayment   Percentage  of  all  Unscheduled
Principal  Receipts  that were  received  by a  Servicer  with  respect  to such
Mortgage  Loan  during  the  Applicable  Unscheduled  Principal  Receipt  Period
relating  to such  Distribution  Date for each  applicable  type of  Unscheduled
Principal Receipt;

            (iii) the Class B-6 Prepayment Percentage of the Scheduled Principal
Balance of such  Mortgage  Loan which,  during the month  preceding the month of
such  Distribution  Date, was repurchased by the Seller pursuant to Section 2.02
or 2.03; and

            (iv) the Class B-6 Percentage of the excess of the unpaid  principal
balance of such Mortgage Loan  substituted for a defective  Mortgage Loan during
the month  preceding the month in which such  Distribution  Date occurs over the
unpaid  principal  balance  of such  defective  Mortgage  Loan,  less the amount
allocable  to the  principal  portion  of  any  unreimbursed  Periodic  Advances
previously  made by the applicable  Servicer,  the Master  Servicer or the Trust
Administrator in respect of such defective Mortgage Loan;

provided,  however,  that if an Optimal  Adjustment Event occurs with respect to
such Class and such  Distribution  Date, the Class B-6 Optimal  Principal Amount
will equal the lesser of (A) the Class B-6 Optimal  Principal Amount  calculated
as described in the preceding  provisions and (B) the Adjusted Principal Balance
for the Class B-6 Certificates.

            Class B-6 Percentage:  As to any  Distribution  Date,  except as set
forth in the next  sentence,  the percentage  calculated by multiplying  (i) the
Subordinated  Percentage by (ii) a fraction, the numerator of which is the Class
B-6 Principal Balance  (determined as of the  Determination  Date preceding such
Distribution  Date)  and the  denominator  of which is the sum of the  Principal
Balances of the Classes of Class B  Certificates  eligible to receive  principal
distributions  for such  Distribution  Date in accordance with the provisions of
Section 4.01(d).  Except as set forth in Section 4.01(d)(ii),  in the event that
the  Class  B-6  Certificates  are not  eligible  to  receive  distributions  of
principal in accordance with the provisions of Section 4.01(d)(i), the Class B-6
Percentage for such Distribution Date will be zero.

            Class B-6 Prepayment Percentage: As to any Distribution Date, except
as set forth in the next sentence,  the percentage calculated by multiplying (i)
the  Subordinated  Prepayment  Percentage  by (ii) a fraction,  the numerator of
which is the Class B-6 Principal  Balance  (determined  as of the  Determination
Date preceding such  Distribution  Date) and the denominator of which is the sum
of the  Principal  Balances of the Classes of Class B  Certificates  eligible to
receive  principal  distributions  for such Distribution Date in accordance with
the provisions of Section 4.01(d).  Except as set forth in Section  4.01(d)(ii),
in the  event  that the Class  B-6  Certificates  are not  eligible  to  receive
distributions  of  principal  in  accordance  with  the  provisions  of  Section
4.01(d)(i),  the Class B-6 Prepayment Percentage for such Distribution Date will
be zero.

            Class B-6 Principal Balance: As to the first Determination Date, the
Original Class B-6 Principal Balance.  As of any subsequent  Determination Date,
the lesser of (i) the Original  Class B-6 Principal  Balance less the sum of (a)
all amounts  previously  distributed in respect of the Class B-6 Certificates on
prior Distribution Dates pursuant to Paragraph  twenty-second of Section 4.01(a)
and (b) the Realized Losses  allocated  through such  Determination  Date to the
Class B-6  Certificates  pursuant to Section  4.02(b) and (ii) the Adjusted Pool
Amount as of the preceding Distribution Date less the Class A Principal Balance,
the Class B-1 Principal Balance,  the Class B-2 Principal Balance, the Class B-3
Principal  Balance,  the Class B-4 Principal Balance and the Class B-5 Principal
Balance as of such Determination Date.

            Class B-6 Unpaid Interest  Shortfall:  As to any Distribution  Date,
the amount,  if any, by which the aggregate of the Class B-6 Interest  Shortfall
Amounts for prior Distribution Dates is in excess of the amounts  distributed in
respect of the Class B-6  Certificates on prior  Distribution  Dates pursuant to
Paragraph twenty-first of Section 4.01(a).

            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  Indirect  Participant:  A  broker,  dealer,  bank,
financial  institution  or other  Person  that  clears  securities  transactions
through  or  maintains  a  custodial   relationship   with  a  Clearing   Agency
Participant, either directly or indirectly.

            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:  The date of initial  issuance of the  Certificates,
as set forth in Section 11.21.

            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.

            Compensating  Interest:  As to any Distribution  Date, the lesser of
(a) the  product  of (i) 1/12th of 0.20% and (ii) the Pool  Scheduled  Principal
Balance  for such  Distribution  Date  and (b) the  Available  Master  Servicing
Compensation for such Distribution Date.

            Co-op  Shares:   Shares  issued  by  private   non-profit  housing
corporations.

            Corporate   Trust  Office:   The  principal   office  of  the  Trust
Administrator  or the  Trustee,  as the case may be, at which at any  particular
time its corporate  trust business  shall be  administered,  which office,  with
respect  to the  Trust  Administrator,  at the  date  of the  execution  of this
instrument is located at 230 South Tryon Street, Charlotte, North Carolina 28288
and with respect to the Trustee,  at the date of execution of this instrument is
located at 114 West 47th Street, New York, New York 10036.

            Cross-Over   Date:  The   Distribution   Date  preceding  the  first
Distribution Date on which the Class A Percentage (determined pursuant to clause
(ii) of the definition thereof) equals or exceeds 100%.

            Cross-Over Date Interest Shortfall: With respect to any Distribution
Date that occurs on or after the Cross-Over Date with respect to any Unscheduled
Principal Receipt (other than a Prepayment in Full):

            (A) in the case where the Applicable  Unscheduled  Principal Receipt
      Period is the  Mid-Month  Receipt  Period and such  Unscheduled  Principal
      Receipt is received by the Servicer on or after the Determination  Date in
      the month preceding the month of such  Distribution  Date but prior to the
      first day of the month of such  Distribution  Date, the amount of interest
      that would have accrued at the Net Mortgage Interest Rate on the amount of
      such  Unscheduled  Principal  Receipt  from the day of its  receipt or, if
      earlier, its application by the Servicer through the last day of the month
      preceding the month of such Distribution Date; and

            (B) in the case where the Applicable  Unscheduled  Principal Receipt
      Period is the Prior Month Receipt  Period and such  Unscheduled  Principal
      Receipt is received by the Servicer  during the month  preceding the month
      of such Distribution  Date, the amount of interest that would have accrued
      at the Net  Mortgage  Interest  Rate  on the  amount  of such  Unscheduled
      Principal  Receipt  from  the  day of its  receipt  or,  if  earlier,  its
      application  by the  Servicer  through  the last day of the month in which
      such Unscheduled Principal Receipt is received.

            Current Class A Interest Distribution Amount: As to any Distribution
Date,  the amount  distributed in respect of the Classes of Class A Certificates
and the Premium  Payment  pursuant to Paragraph first of Section 4.01(a) on such
Distribution Date.

            Current Class B Interest Distribution Amount: As to any Distribution
Date,  the amount  distributed in respect of the Classes of Class B Certificates
pursuant to Paragraphs  fifth,  eighth,  eleventh,  fourteenth,  seventeenth and
twentieth of Section 4.01(a) on such Distribution Date.

            Current Class B-1 Fractional  Interest:  As to any Distribution Date
subsequent to the first Distribution  Date, the percentage  obtained by dividing
the sum of the Principal  Balances of the Class B-2, Class B-3, Class B-4, Class
B-5 and  Class  B-6  Certificates  by the sum of the  Class A  Non-PO  Principal
Balance and the Class B Principal  Balance.  As to the first  Distribution Date,
the Original Class B-1 Fractional Interest.

            Current Class B-2 Fractional  Interest:  As to any Distribution Date
subsequent to the first Distribution  Date, the percentage  obtained by dividing
the sum of the  Principal  Balances of the Class B-3,  Class B-4,  Class B-5 and
Class B-6  Certificates by the sum of the Class A Non-PO  Principal  Balance and
the Class B Principal  Balance.  As to the first Distribution Date, the Original
Class B-2 Fractional Interest.

            Current Class B-3 Fractional  Interest:  As to any Distribution Date
subsequent to the first Distribution  Date, the percentage  obtained by dividing
the sum of the  Principal  Balances  of the Class  B-4,  Class B-5 and Class B-6
Certificates by the sum of the Class A Non-PO Principal  Balance and the Class B
Principal  Balance.  As to the first  Distribution  Date, the Original Class B-3
Fractional Interest.

            Current Class B-4 Fractional  Interest:  As to any Distribution Date
subsequent to the first Distribution  Date, the percentage  obtained by dividing
the sum of the Principal Balances of the Class B-5 and Class B-6 Certificates by
the sum of the  Class A  Non-PO  Principal  Balance  and the  Class B  Principal
Balance.  As to the first  Distribution  Date, the Original Class B-4 Fractional
Interest.

            Current Class B-5 Fractional  Interest:  As to any Distribution Date
subsequent to the first Distribution  Date, the percentage  obtained by dividing
the Principal  Balance of the Class B-6  Certificates  by the sum of the Class A
Non-PO  Principal  Balance  and the Class B Principal  Balance.  As to the first
Distribution Date, the Original Class B-5 Fractional Interest.

            Curtailment:  Any Principal  Prepayment  made by a Mortgagor which
is not a Prepayment in Full.

            Custodial Agreement:  The Custodial Agreement,  if any, from time to
time in effect  between the  Custodian  named  therein,  the Seller,  the Master
Servicer  and the Trust  Administrator,  substantially  in the form of Exhibit E
hereto,  as the same may be amended or modified  from time to time in accordance
with the terms thereof.

            Custodial P&I Account: The Custodial P&I Account, as defined in each
of the Servicing Agreements,  with respect to the Mortgage Loans. In determining
whether the Custodial P&I Account under any Servicing  Agreement is "acceptable"
to the Master  Servicer  (as may be  required  by the  definition  of  "Eligible
Account"  contained in the  Servicing  Agreements),  the Master  Servicer  shall
require  that  any  such  account  shall  be  acceptable  to each of the  Rating
Agencies.

            Custodian:  Initially,  the Trust Administrator,  and thereafter the
Custodian,  if any, hereafter appointed by the Trust  Administrator  pursuant to
Section 8.13, or its successor in interest  under the Custodial  Agreement.  The
Custodian  may (but need not) be the  Trustee,  the Trust  Administrator  or any
Person  directly or  indirectly  controlling  or  controlled  by or under common
control  of either of them.  Neither a  Servicer,  nor the Seller nor the Master
Servicer nor any Person  directly or indirectly  controlling or controlled by or
under common control with any such Person may be appointed Custodian.

            Cut-Off  Date:  The first day of the month of initial  issuance of
the Certificates as set forth in Section 11.02.

            Cut-Off Date  Aggregate  Principal  Balance:  The aggregate of the
Cut-Off  Date  Principal  Balances  of the  Mortgage  Loans is as set forth in
Section 11.03.

            Cut-Off Date Principal Balance: As to each Mortgage Loan, its unpaid
principal  balance as of the close of business on the Cut-Off  Date (but without
giving effect to any Unscheduled  Principal  Receipts received or applied on the
Cut-Off Date), reduced by all payments of principal due on or before the Cut-Off
Date and not paid, and increased by scheduled  monthly payments of principal due
after the Cut-Off  Date but  received  by the related  Servicer on or before the
Cut-Off Date.

            Debt  Service  Reduction:  With  respect  to any  Mortgage  Loan,  a
reduction in the scheduled  Monthly Payment for such Mortgage Loan by a court of
competent  jurisdiction in a proceeding under the Bankruptcy Code, except such a
reduction constituting a Deficient Valuation.

            Deceased  Holder:  A Beneficial Owner of a Class A-3 Certificate who
was living at the time such interest was acquired, whose death is deemed to have
occurred  pursuant  to  Section  4.07(b),  and with  respect  to which the Trust
Administrator  has  received  through  the  Clearing  Agency  evidence  of death
satisfactory  to the Trust  Administrator  and any tax waivers  requested by the
Trustee.

            Deficient Valuation:  With respect to any Mortgage Loan, a valuation
by a court of competent jurisdiction of the Mortgaged Property in an amount less
than the then-outstanding indebtedness under the Mortgage Loan, or any reduction
in the amount of principal to be paid in connection  with any scheduled  Monthly
Payment that results in a permanent forgiveness of principal, which valuation or
reduction results from a proceeding under the Bankruptcy Code.

            Definitive Certificates:  As defined in Section 5.01(b).

            Denomination:  The amount,  if any,  specified on the face of each
Certificate  representing the principal  portion of the Cut-Off Date Aggregate
Principal Balance evidenced by such Certificate.

            Determination  Date:  The  17th  day of the  month  in  which  the
related  Distribution  Date occurs, or if such 17th day is not a Business Day,
the Business Day preceding such 17th day.

            Discount  Mortgage  Loan:  A  Mortgage  Loan  with a Net  Mortgage
Interest Rate of less than 6.250%.

            Distribution Date: The 25th day of any month, beginning in the month
following 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.

            Due  Date:  With  respect  to any  Mortgage  Loan,  the day of the
month in which the Monthly  Payment on such  Mortgage  Loan is scheduled to be
paid.

            Eligible Account:  One or more accounts (i) that are maintained with
a depository institution (which may be the Master Servicer) whose long-term debt
obligations  (or,  in the case of a  depository  institution  which is part of a
holding company structure, the long-term debt obligations of such parent holding
company)  at the  time of  deposit  therein  are  rated  at  least  "AA" (or the
equivalent) by each of the Rating Agencies, (ii) the deposits in which are fully
insured  by the FDIC  through  either  the Bank  Insurance  Fund or the  Savings
Association  Insurance Fund, (iii) the deposits in which are insured by the FDIC
through either the Bank Insurance Fund or the Savings Association Insurance Fund
(to the  limit  established  by the FDIC) and the  uninsured  deposits  in which
accounts are otherwise secured,  as evidenced by an Opinion of Counsel delivered
to the Trust Administrator,  such that the Trust Administrator, on behalf of the
Certificateholders  has a claim with respect to the funds in such  accounts or a
perfected  first security  interest  against any collateral  securing such funds
that  is  superior  to  claims  of any  other  depositors  or  creditors  of the
depository  institution  with which such accounts are maintained,  (iv) that are
trust  accounts  maintained  with the trust  department  of a  federal  or state
chartered  depository  institution  or trust  company  acting  in its  fiduciary
capacity  or (v) such other  account  that is  acceptable  to each of the Rating
Agencies  and would not cause the Trust  Estate to fail to qualify as a REMIC or
result in the imposition of any federal tax on the REMIC.

            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 continue to qualify as "cash flow investments" as
defined in Code Section 860G(a)(6):

            (i)  obligations  of the  United  States of  America  or any  agency
thereof,  provided such  obligations  are backed by the full faith and credit of
the United States of America;

            (ii) general obligations of or obligations guaranteed by any
state of the United States of America or the District of Columbia  receiving the
highest  short-term or highest  long-term rating of each Rating Agency,  or such
lower rating as would not result in the  downgrading or withdrawal of the rating
then  assigned to any of the  Certificates  by either Rating Agency or result in
any of such rated  Certificates being placed on credit review status (other than
for possible upgrading) (or, in the case of the Class A-3 Certificates,  without
giving effect to the guaranty provided by Ambac) by either Rating Agency;

            (iii) commercial or finance company paper which is then rated in the
highest  long-term  commercial or finance  company paper rating category of each
Rating Agency or the highest  short-term  rating category of each Rating Agency,
or such  lower  rating  category  as would  not  result  in the  downgrading  or
withdrawal  of the rating  then  assigned to any of the  Certificates  by either
Rating Agency or result in any of such rated Certificates being placed on credit
review status (other than for possible  upgrading) (or, in the case of the Class
A-3  Certificates,  without giving effect to the guaranty  provided by Ambac) by
either Rating Agency;

            (iv) certificates of deposit, demand or time deposits, federal funds
or banker's  acceptances  issued by any depository  institution or trust company
incorporated  under the laws of the United  States or of any state  thereof  and
subject  to  supervision   and  examination  by  federal  and/or  state  banking
authorities,  provided that the commercial paper and/or debt obligations of such
depository  institution  or  trust  company  (or in the  case  of the  principal
depository institution in a holding company system, the commercial paper or debt
obligations of such holding company) are then rated in the highest short-term or
the highest  long-term rating category for such securities of each of the Rating
Agencies, or such lower rating categories as would not result in the downgrading
or withdrawal of the rating then assigned to any of the  Certificates  by either
Rating Agency or result in any of such rated Certificates being placed on credit
review status (other than for possible  upgrading) (or, in the case of the Class
A-3  Certificates,  without giving effect to the guaranty  provided by Ambac) by
either Rating Agency;

            (v) guaranteed reinvestment agreements issued by any bank, insurance
company or other corporation acceptable to each Rating Agency at the time of the
issuance of such agreements;

            (vi)  repurchase  agreements  on  obligations  with  respect  to any
security  described in clauses (i) or (ii) above or any other security issued or
guaranteed by an agency or instrumentality  of the United States of America,  in
either case entered into with a depository  institution or trust company (acting
as principal) described in (iv) above;

            (vii)  securities (other than  stripped  bonds or  stripped  coupon
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,  at the time of such investment or contractual  commitment  providing for
such  investment,  are  then  rated in the  highest  short-term  or the  highest
long-term  rating  category  by each  Rating  Agency,  or in such  lower  rating
category as would not result in the downgrading or withdrawal of the rating then
assigned to any of the  Certificates by either Rating Agency or result in any of
such rated  Certificates  being placed on credit  review  status (other than for
possible  upgrading)  (or,  in the case of the Class A-3  Certificates,  without
giving effect to the guaranty provided by Ambac) by either Rating Agency; and

            (viii) such other  investments  acceptable  to each Rating Agency as
would  not  result  in  the  downgrading  of the  rating  then  assigned  to the
Certificates by either Rating Agency or result in any of such rated Certificates
being placed on credit review status (other than for possible upgrading) (or, in
the case of the Class A-3  Certificates,  without  giving effect to the guaranty
provided by Ambac) by either Rating Agency.

            In no event shall an  instrument  be an Eligible  Investment if such
instrument  evidences either (i) a right to receive only interest  payments with
respect to the obligations  underlying such  instrument,  or (ii) both principal
and interest  payments derived from  obligations  underlying such instrument and
the interest and principal  payments with respect to such  instrument  provide a
yield to maturity at the date of investment of greater than 120% of the yield to
maturity at par of such underlying obligations.

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

            ERISA Prohibited Holder:  As defined in Section 5.02(d).

            Errors and Omissions  Policy:  As defined in each of the Servicing
Agreements.

            Event of Default:  Any of the events specified in Section 7.01.

            Excess  Bankruptcy Loss: With respect to any  Distribution  Date and
any  Mortgage  Loan as to  which a  Bankruptcy  Loss is  realized  in the  month
preceding the month of such  Distribution  Date,  (i) if the  Aggregate  Current
Bankruptcy   Losses  with   respect  to  such   Distribution   Date  exceed  the
then-applicable Bankruptcy Loss Amount, then the portion of such Bankruptcy Loss
represented by the ratio of (a) the excess of the Aggregate  Current  Bankruptcy
Losses  over the  then-applicable  Bankruptcy  Loss  Amount,  divided by (b) the
Aggregate Current  Bankruptcy Losses or (ii) if the Aggregate Current Bankruptcy
Losses  with  respect  to such  Distribution  Date are less than or equal to the
then-applicable  Bankruptcy Loss Amount, then zero. In addition,  any Bankruptcy
Loss occurring  with respect to a Mortgage Loan on or after the Cross-Over  Date
will be an Excess Bankruptcy Loss.

            Excess  Fraud Loss:  With respect to any  Distribution  Date and any
Mortgage  Loan as to which a Fraud Loss is realized in the month  preceding  the
month of such Distribution  Date, (i) if the Aggregate Current Fraud Losses with
respect to such Distribution Date exceed the then-applicable  Fraud Loss Amount,
then the portion of such Fraud Loss  represented  by the ratio of (a) the excess
of the  Aggregate  Current  Fraud  Losses  over the  then-applicable  Fraud Loss
Amount,  divided  by (b) the  Aggregate  Current  Fraud  Losses,  or (ii) if the
Aggregate  Current Fraud Losses with respect to such  Distribution Date are less
than or equal to the then-applicable  Fraud Loss Amount, then zero. In addition,
any  Fraud  Loss  occurring  with  respect  to a  Mortgage  Loan on or after the
Cross-Over Date will be an Excess Fraud Loss.

            Excess Special Hazard Loss:  With respect to any  Distribution  Date
and any Mortgage Loan as to which a Special Hazard Loss is realized in the month
preceding the month of such  Distribution  Date,  (i) if the  Aggregate  Current
Special  Hazard  Losses  with  respect  to such  Distribution  Date  exceed  the
then-applicable  Special  Hazard Loss  Amount,  then the portion of such Special
Hazard Loss represented by the ratio of (a) the excess of the Aggregate  Current
Special  Hazard  Losses over the  then-applicable  Special  Hazard Loss  Amount,
divided by (b) the  Aggregate  Current  Special  Hazard  Losses,  or (ii) if the
Aggregate  Current Special Hazard Losses with respect to such  Distribution Date
are less than or equal to the  then-applicable  Special Hazard Loss Amount, then
zero. In addition,  any Special Hazard Loss occurring with respect to a Mortgage
Loan on or after the Cross-Over Date will be an Excess Special Hazard Loss.

            Exhibit F-1 Mortgage Loan:  Any of the Mortgage Loans  identified in
Exhibit  F-1  hereto,  as  such  Exhibit  may be  amended  from  time to time in
connection with a substitution  pursuant to Section 2.02, which Mortgage Loan is
serviced under the Norwest Servicing Agreement.

            Exhibit F-2 Mortgage Loan:  Any of the Mortgage Loans  identified in
Exhibit  F-2  hereto,  as  such  Exhibit  may be  amended  from  time to time in
connection with a substitution  pursuant to Section 2.02, which Mortgage Loan is
serviced under an Other Servicing Agreement.

            FDIC: The Federal Deposit  Insurance  Corporation or any successor
thereto.

            FHLMC:   The  Federal  Home  Loan  Mortgage   Corporation  or  any
successor thereto.

            Fidelity Bond:  As defined in each of the Servicing Agreements.

            Final  Distribution  Date:  The  Distribution  Date on  which  the
final  distribution  in  respect  of the  Certificates  is  made  pursuant  to
Section 9.01.

            Final Scheduled Maturity Date: The Final Scheduled Maturity Date for
the Class A-1, Class A-2,  Class A-3,  Class A-4,  Class A-PO,  Class A-R, Class
B-1, Class B-2, Class B-3,  Class B-4, Class B-5 and Class B-6  Certificates  is
June 25, 2029 which  corresponds  to the  "latest  possible  maturity  date" for
purposes of Section 860G(a)(1) of the Internal Revenue Code of 1986, as amended.

            Fitch:  Fitch IBCA, Inc., or its successor in interest.

            Fixed  Retained  Yield:  The fixed  percentage  of  interest on each
Mortgage Loan with a Mortgage  Interest Rate greater than the sum of (a) 6.250%,
(b) the  applicable  Servicing  Fee Rate and (c) the Master  Servicing Fee Rate,
which will be  determined  on a loan by loan  basis and will equal the  Mortgage
Interest Rate on each Mortgage Loan minus the sum of (a), (b) and (c),  which is
not assigned to and not part of the Trust Estate.

            Fixed Retained Yield Rate: With respect to each Mortgage Loan, a per
annum rate equal to the greater of (a) zero and (b) the Mortgage  Interest  Rate
on such Mortgage Loan minus the sum of (i) 6.250%, (ii) the applicable Servicing
Fee Rate and (iii) the Master Servicing Fee Rate.

            FNMA:  Fannie Mae or any successor thereto.

            Foreclosure  Profits:  As to any Distribution  Date, the excess,  if
any,  of (i) Net  Liquidation  Proceeds  in respect of each  Mortgage  Loan that
became a Liquidated  Loan during the Applicable  Unscheduled  Principal  Receipt
Period with respect to Full Unscheduled Principal Receipts for such Distribution
Date over (ii) the sum of the unpaid  principal  balance of each such Liquidated
Loan plus accrued and unpaid interest at the applicable  Mortgage  Interest Rate
on the unpaid principal  balance thereof from the Due Date to which interest was
last paid by the Mortgagor  (or, in the case of a Liquidated  Loan that had been
an REO  Mortgage  Loan,  from the Due Date to which  interest was last deemed to
have been  paid) to the first day of the month in which such  Distribution  Date
occurs.

            Fraud  Loss:  A  Liquidated  Loan Loss as to which there was fraud
in the origination of such Mortgage Loan.

            Fraud Loss  Amount:  As of any  Distribution  Date after the Cut-Off
Date an amount equal to: (X) prior to the first  anniversary of the Cut-Off Date
an amount  equal to  $4,503,032.03  minus the  aggregate  amount of Fraud Losses
allocated  solely to the Class B Certificates in accordance with Section 4.02(a)
since the Cut-Off Date, and (Y) from the first through fifth  anniversary of the
Cut-Off  Date, an amount equal to (1) the lesser of (a) the Fraud Loss Amount as
of the  most  recent  anniversary  of the  Cut-Off  Date  and (b)  1.00%  of the
aggregate  outstanding  principal balance of all of the Mortgage Loans as of the
most recent anniversary of the Cut-Off Date minus (2) the Fraud Losses allocated
solely to the Class B Certificates  in accordance with Section 4.02(a) since the
most recent anniversary of the Cut-Off Date. On and after the Cross-Over Date or
after the fifth  anniversary  of the Cut-Off Date the Fraud Loss Amount shall be
zero.

            Full  Unscheduled   Principal  Receipt:  Any  Unscheduled  Principal
Receipt  with  respect to a Mortgage  Loan (i) in the amount of the  outstanding
principal  balance of such Mortgage Loan and resulting in the full  satisfaction
of such  Mortgage  Loan or (ii)  representing  Liquidation  Proceeds  other than
Partial Liquidation Proceeds.

            Holder:  See "Certificateholder."

            Independent:  When used with respect to any specified  Person,  such
Person who (i) is in fact independent of the Seller, the Master Servicer and any
Servicer,  (ii) does not have any  direct  financial  interest  or any  material
indirect financial interest in the Seller or the Master Servicer or any Servicer
or in an affiliate of either,  and (iii) is not connected  with the Seller,  the
Master Servicer or any Servicer as an officer, employee, promoter,  underwriter,
trustee,  trust  administrator,  partner,  director or person performing similar
functions.

            Individual Class A-3  Certificate:  A Class A-3  Certificate which
evidences $1,000 Original Principal Balance.

            Insurance  Policy:  Any insurance or performance  bond relating to a
Mortgage Loan or the Mortgage  Loans,  including any hazard  insurance,  special
hazard  insurance,  flood  insurance,  primary  mortgage  insurance,   mortgagor
bankruptcy bond or title insurance.

            Insurance  Proceeds:  Proceeds paid by any insurer pursuant to any
Insurance Policy covering a Mortgage Loan.

            Insured  Expenses:   Expenses  covered  by  any  Insurance  Policy
covering a Mortgage Loan.

            Interest Accrual Amount:  As to any Distribution  Date and any Class
of Class A Certificates  (other than the Class A-4 and Class A-PO Certificates),
(a) the  product of (i) 1/12th of the Class A  Pass-Through  Rate for such Class
and (ii) the  Principal  Balance  of such  Class  as of the  Determination  Date
preceding such  Distribution  Date minus (b) the Class A Interest  Percentage of
such Class of (i) any Non-Supported  Interest Shortfall allocated to the Class A
Certificates  and the Premium  Payment with respect to such  Distribution  Date,
(ii) the interest  portion of any Excess  Special  Hazard  Losses,  Excess Fraud
Losses and Excess  Bankruptcy  Losses  allocated to the Class A Certificates and
the Premium Payment with respect to such  Distribution  Date pursuant to Section
4.02(e) and (iii) the interest portion of any Realized Losses (other than Excess
Special  Hazard  Losses,  Excess  Fraud  Losses  and Excess  Bankruptcy  Losses)
allocated to the Class A  Certificates  and the Premium  Payment on or after the
Cross-Over  Date  pursuant  to  Section  4.02(e).  The Class A-4 and Class  A-PO
Certificates have no Interest Accrual Amount.

            As to any  Distribution  Date and any Class of Class B Certificates,
an amount  equal to (i) the product of 1/12th of the Class B  Pass-Through  Rate
and the Principal Balance of such Class as of the  Determination  Date preceding
such Distribution Date minus (ii) the Class B Interest  Percentage of such Class
of  (x)  any  Non-Supported   Interest  Shortfall   allocated  to  the  Class  B
Certificates with respect to such Distribution Date and (y) the interest portion
of any Excess Special Hazard Losses,  Excess Fraud Losses and Excess  Bankruptcy
Losses allocated to the Class B Certificates  with respect to such  Distribution
Date pursuant to Section 4.02(e).

            Lehman  Brothers:  Lehman  Brothers  Inc.,  or  its  successor  in
interest.

            Liquidated  Loan: A Mortgage  Loan with respect to which the related
Mortgaged Property has been acquired,  liquidated or foreclosed and with respect
to which the applicable Servicer determines that all Liquidation  Proceeds which
it expects to recover have been recovered.

            Liquidated  Loan Loss:  With respect to any  Distribution  Date, the
aggregate  of the  amount of losses  with  respect to each  Mortgage  Loan which
became a Liquidated  Loan during the Applicable  Unscheduled  Principal  Receipt
Period with respect to Full Unscheduled Principal Receipts for such Distribution
Date,  equal to the  excess of (i) the  unpaid  principal  balance  of each such
Liquidated   Loan,  plus  accrued   interest  thereon  in  accordance  with  the
amortization  schedule  at the time  applicable  thereto at the  applicable  Net
Mortgage Interest Rate from the Due Date as to which interest was last paid with
respect  thereto  through the last day of the month preceding the month in which
such Distribution Date occurs,  over (ii) Net Liquidation  Proceeds with respect
to such Liquidated Loan.

            Liquidation Expenses:  Expenses incurred by a Servicer in connection
with the  liquidation  of any defaulted  Mortgage  Loan or property  acquired in
respect  thereof  (including,  without  limitation,  legal  fees  and  expenses,
committee  or referee  fees,  and,  if  applicable,  brokerage  commissions  and
conveyance taxes), any unreimbursed  advances expended by such Servicer pursuant
to its  Servicing  Agreement  or the  Master  Servicer  or  Trust  Administrator
pursuant hereto respecting the related Mortgage Loan, including any unreimbursed
advances for real property taxes or for property  restoration or preservation of
the  related  Mortgaged  Property.  Liquidation  Expenses  shall not include any
previously  incurred expenses in respect of an REO Mortgage Loan which have been
netted against related REO Proceeds.

            Liquidation  Proceeds:  Amounts  received  by a Servicer  (including
Insurance  Proceeds) in connection  with the  liquidation of defaulted  Mortgage
Loans or property acquired in respect thereof, whether through foreclosure, sale
or otherwise, including payments in connection with such Mortgage Loans received
from the  Mortgagor,  other than  amounts  required to be paid to the  Mortgagor
pursuant  to the terms of the  applicable  Mortgage  or to be applied  otherwise
pursuant to law.

            Living  Holder:  Beneficial  Owner of the  Class A-3  Certificates
other than a Deceased Holder.

            Loan-to-Value  Ratio:  The ratio,  expressed  as a  percentage,  the
numerator of which is the  principal  balance of a particular  Mortgage  Loan at
origination  and the  denominator  of which is the  lesser of (x) the  appraised
value of the related Mortgaged Property  determined in the appraisal used by the
originator  at the time of  origination  of such Mortgage  Loan,  and (y) if the
Mortgage is originated in connection with a sale of the Mortgaged Property,  the
sale price for such Mortgaged Property.

            Master  Servicer:  Norwest Bank Minnesota,  National  Association,
or its successor in interest.

            Master  Servicing  Fee:  With respect to any  Mortgage  Loan and any
Distribution  Date, the fee payable monthly to the Master  Servicer  pursuant to
Section 6.05 equal to a fixed percentage  (expressed as a per annum rate) of the
unpaid principal balance of such Mortgage Loan.

            Master Servicing Fee Rate:  As set forth in Section 11.26.

            Mid-Month Receipt Period:  With respect to each  Distribution  Date,
the one month period beginning on the Determination Date (or, in the case of the
first Distribution  Date, from and including the Cut-Off-Date)  occurring in the
calendar month  preceding the month in which such  Distribution  Date occurs and
ending on the day preceding the  Determination  Date immediately  preceding such
Distribution Date.

            Month End Interest:  As defined in each Servicing Agreement.

            Monthly Payment: As to any Mortgage Loan (including any REO Mortgage
Loan) and any Due Date,  the payment of  principal  and  interest due thereon in
accordance with the amortization  schedule at the time applicable thereto (after
adjustment for any Curtailments and Deficient Valuations occurring prior to such
Due Date but before any adjustment to such amortization schedule, other than for
Deficient  Valuations,  by reason of any bankruptcy or similar proceeding or any
moratorium or similar waiver or grace period).

            Mortgage: The mortgage, deed of trust or other instrument creating a
first lien on Mortgaged  Property  securing a Mortgage  Note  together  with any
Mortgage Loan Rider, if applicable.

            Mortgage Interest Rate:  As to any Mortgage Loan, the per annum rate
at which interest accrues on the unpaid  principal  balance thereof as set forth
in the related  Mortgage  Note,  which rate is as indicated on the Mortgage Loan
Schedule.

            Mortgage  Loan  Purchase  Agreement:  The  mortgage  loan  purchase
agreement dated as of May 26, 1999 between Norwest Mortgage,  as seller, and the
Seller, as purchaser.

            Mortgage Loan Rider: The standard  FNMA/FHLMC riders to the Mortgage
Note  and/or  Mortgage  riders  required  when  the  Mortgaged   Property  is  a
condominium unit or a unit in a planned unit development.

            Mortgage Loan Schedule:  The list of the Mortgage Loans  transferred
to the Trust  Administrator  on the Closing Date as part of the Trust Estate and
attached hereto as Exhibits F-1 and F-2, which list may be amended following the
Closing Date upon  conveyance of a Substitute  Mortgage Loan pursuant to Section
2.02 or 2.03  and  which  list  shall  set  forth  at a  minimum  the  following
information  of the close of business on the Cut-Off  Date (or,  with respect to
Substitute  Mortgage  Loans,  as  of  the  close  of  business  on  the  day  of
substitution) as to each Mortgage Loan:

            (i)   the Mortgage Loan identifying number;

            (ii)  the city, state and zip code of the Mortgaged Property;

            (iii) the type of property;

            (iv)  the Mortgage Interest Rate;

            (v)   the Net Mortgage Interest Rate;

            (vi)  the Monthly Payment;

            (vii) the original number of months to maturity;

            (viii) the scheduled maturity date;

            (ix)  the Cut-Off Date Principal Balance;

            (x)   the Loan-to-Value Ratio at origination;

            (xi)  whether such Mortgage Loan is a Subsidy Loan;

            (xii) whether  such  Mortgage  Loan is covered by primary  mortgage
insurance;

            (xiii) the applicable Servicing Fee Rate;

            (xiv) the Master Servicing Fee;

            (xv) Fixed Retained Yield, if applicable; and

            (xvi) for each Exhibit F-2 Mortgage  Loan,  the name of the Servicer
with respect thereto.

            Such schedule may consist of multiple reports that  collectively set
forth all of the information required.

            Mortgage Loans:  Each of the mortgage loans transferred and assigned
to the Trust  Administrator on the Closing Date pursuant to Section 2.01 and any
mortgage loans  substituted  therefor  pursuant to Section 2.02 or 2.03, in each
case as from time to time are included in the Trust Estate as  identified in the
Mortgage Loan Schedule.

            Mortgage  Note:  The  note  or  other  evidence  of   indebtedness
evidencing  the  indebtedness  of a Mortgagor  under a Mortgage  Loan together
with any related Mortgage Loan Riders, if applicable.

            Mortgaged  Property:  The  property  subject to a Mortgage,  which
may include Co-op Shares or residential long-term leases.

            Mortgagor:  The obligor on a Mortgage Note.

            Net Foreclosure Profits: As to any Distribution Date, the amount, if
any,  by  which  (i)  Aggregate   Foreclosure   Profits  with  respect  to  such
Distribution  Date exceed  (ii)  Liquidated  Loan  Losses  with  respect to such
Distribution Date.

            Net  Liquidation  Proceeds:  As to any  defaulted  Mortgage  Loan,
Liquidation Proceeds net of Liquidation Expenses.

            Net Mortgage  Interest  Rate:  With respect to each Mortgage Loan, a
rate equal to (i) the Mortgage  Interest  Rate on such  Mortgage Loan minus (ii)
the sum of (a) the applicable  Servicing Fee Rate, as set forth in Section 11.25
with respect to such Mortgage  Loan,  (b) the Master  Servicing Fee Rate, as set
forth in Section  11.26 with  respect  to such  Mortgage  Loan and (c) the Fixed
Retained  Yield Rate, if any, with respect to such  Mortgage  Loan.  Any regular
monthly computation of interest at such rate shall be based upon annual interest
at such rate on the applicable amount divided by twelve.

            Net REO Proceeds:  As to any REO Mortgage  Loan,  REO Proceeds net
of any related expenses of the Servicer.

            Non-permitted Foreign Holder:  As defined in Section 5.02(d).

            Non-PO  Fraction:  With respect to any Mortgage  Loan, the lesser of
(i) 1.00 and (ii) the quotient  obtained by dividing  the Net Mortgage  Interest
Rate for such Mortgage Loan by 6.250%.

            Nonrecoverable Advance: Any portion of a Periodic Advance previously
made or  proposed  to be made in respect  of a Mortgage  Loan which has not been
previously  reimbursed  to the  Servicer,  the  Master  Servicer  or  the  Trust
Administrator,  as the case may be, and which the Servicer,  the Master Servicer
or the Trust  Administrator  determines  will not,  or in the case of a proposed
Periodic Advance would not, be ultimately  recoverable from Liquidation Proceeds
or other recoveries in respect of the related  Mortgage Loan. The  determination
by the Servicer,  the Master Servicer or the Trust Administrator (i) that it has
made a Nonrecoverable  Advance or (ii) that any proposed  Periodic  Advance,  if
made,  would  constitute  a  Nonrecoverable  Advance,  shall be  evidenced by an
Officer's  Certificate  of the  Servicer  delivered  to the Master  Servicer for
redelivery to the Trust  Administrator or, in the case of a Master Servicer or a
Trust  Administrator  determination,  an  Officer's  Certificate  of the  Master
Servicer  or the Trust  Administrator  delivered  to the  Trustee,  in each case
detailing the reasons for such determination.

            Non-Supported  Interest Shortfall:  With respect to any Distribution
Date, the excess, if any, of the aggregate  Prepayment Interest Shortfall on the
Mortgage  Loans over the  aggregate  Compensating  Interest with respect to such
Distribution  Date. With respect to each Distribution Date occurring on or after
the Cross-Over Date, the Non-Supported Interest Shortfall determined pursuant to
the preceding  sentence will be increased by the amount of any  Cross-Over  Date
Interest  Shortfall  for such  Distribution  Date.  Any  Non-Supported  Interest
Shortfall  will be  allocated  to (a) the Class A  Certificates  and the Premium
Payment  according  to the  percentage  obtained by dividing  the Class A Non-PO
Principal  Balance by the sum of the Class A Non-PO  Principal  Balance  and the
Class B Principal  Balance  and (b) the Class B  Certificates  according  to the
percentage  obtained by dividing the Class B Principal Balance by the sum of the
Class A Non-PO Principal Balance and the Class B Principal Balance.

            Non-U.S. Person:  As defined in Section 4.01(f).

            Norwest  Mortgage:  Norwest  Mortgage,  Inc.,  or its successor in
interest.

            Norwest  Mortgage  Correspondents:  The  entities  listed  on  the
Mortgage Loan  Schedule,  from which Norwest  Mortgage  purchased the Mortgage
Loans.

            Norwest Servicing  Agreement:  The Servicing  Agreement  providing
for the  servicing  of the  Exhibit F-1  Mortgage  Loans  initially by Norwest
Mortgage.

            Notice  of  Nonpayment:  The  notice  to be  delivered  by the Trust
Administrator to Ambac with respect to any  Distribution  Date as to which there
is a Class A-3 Distribution  Deficiency,  which shall be in the form attached to
the Policy.

            Officers'  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),  and
delivered to the Trustee or the Trust Administrator, as the case may be.

            Opinion of Counsel: A written opinion of counsel, who may be outside
or salaried counsel for the Seller,  a Servicer or the Master  Servicer,  or any
affiliate of the Seller,  a Servicer or the Master  Servicer,  acceptable to the
Trustee if such opinion is to be delivered to the Trustee,  or acceptable to the
Trust   Administrator   if  such  opinion  is  to  be  delivered  to  the  Trust
Administrator;  provided,  however, that with respect to REMIC matters,  matters
relating  to the  determination  of  Eligible  Accounts  or matters  relating to
transfers of Certificates, such counsel shall be Independent.

            Optimal  Adjustment  Event:  With  respect  to any  Class of Class B
Certificates and any Distribution  Date, an Optimal  Adjustment Event will occur
with  respect to such Class if: (i) the  Principal  Balance of such Class on the
Determination  Date succeeding such Distribution Date would have been reduced to
zero  (regardless  of whether  such  Principal  Balance was reduced to zero as a
result of principal  distribution or the allocation of Realized Losses) and (ii)
(a) the Principal Balance of any Class of Class A Certificates  would be subject
to  further  reduction  as a  result  of the  third or  fifth  sentences  of the
definition of Principal Balance or (b) the Principal Balance of a Class of Class
B Certificates with a lower numerical  designation would be reduced with respect
to such  Distribution  Date as a result of the application of clause (ii) of the
definition of Class B-1 Principal Balance,  Class B-2 Principal  Balance,  Class
B-3 Principal Balance,  Class B-4 Principal Balance, Class B-5 Principal Balance
or Class B-6 Principal Balance.

            Original  Class A  Percentage:  The Class A  Percentage  as of the
Cut-Off Date, as set forth in Section 11.04.

            Original Class A Non-PO Principal  Balance:  The sum of the Original
Principal  Balances of the Class A-1,  Class A-2, Class A-3, Class A-4 and Class
A-R Certificates, as set forth in Section 11.06.

            Original  Class B  Principal  Balance:  The  sum of  the  Original
Class B-1 Principal  Balance,  Original  Class B-2 Principal  Balance,  Original
Class B-3 Principal  Balance,  Original  Class B-4 Principal  Balance,  Original
Class B-5 Principal  Balance and Original  Class B-6 Principal  Balance,  as set
forth in Section 11.14.

            Original Class B-1 Fractional Interest: As to the first Distribution
Date,  the  percentage  obtained by dividing the sum of the  Original  Class B-2
Principal Balance,  the Original Class B-3 Principal Balance, the Original Class
B-4 Principal  Balance,  Original  Class B-5 Principal  Balance and the Original
Class B-6 Principal  Balance by the sum of the Original Class A Non-PO Principal
Balance and the  Original  Class B Principal  Balance.  The  Original  Class B-1
Fractional Interest is specified in Section 11.16.

            Original Class B-2 Fractional Interest: As to the first Distribution
Date,  the  percentage  obtained by dividing the sum of the  Original  Class B-3
Principal Balance, the Original Class B-4 Principal Balance,  Original Class B-5
Principal Balance and the Original Class B-6 Principal Balance by the sum of the
Original  Class A Non-PO  Principal  Balance and the Original  Class B Principal
Balance.  The  Original  Class B-2  Fractional  Interest is specified in Section
11.17.

            Original Class B-3 Fractional Interest: As to the first Distribution
Date,  the  percentage  obtained by dividing the sum of the  Original  Class B-4
Principal  Balance,  the Original  Class B-5 Principal  Balance and the Original
Class B-6 Principal  Balance by the sum of the Original Class A Non-PO Principal
Balance and the  Original  Class B Principal  Balance.  The  Original  Class B-3
Fractional Interest is specified in Section 11.18.

            Original   Class B-4   Fractional   Interest:   As  to  the  first
Distribution  Date,  the  percentage  obtained  by  dividing  the  sum  of the
Original  Class B-5  Principal  Balance and the Original  Class B-6  Principal
Balance by the sum of the Original  Class A Non-PO  Principal  Balance and the
Original  Class B  Principal  Balance.   The  Original  Class B-4   Fractional
Interest is specified in Section 11.19.

            Original Class B-5 Fractional Interest: As to the first Distribution
Date,  the  percentage  obtained by dividing  the Original  Class B-6  Principal
Balance by the sum of the  Original  Class A Non-PO  Principal  Balance  and the
Original Class B Principal Balance.  The Original Class B-5 Fractional  Interest
is specified in Section 11.20.

            Original  Class B-1  Percentage:  The  Class B-1  Percentage as of
the Cut-Off Date, as set forth in Section 11.08.

            Original  Class B-2  Percentage:  The  Class B-2  Percentage as of
the Cut-Off Date, as set forth in Section 11.09.

            Original  Class B-3  Percentage:  The  Class B-3  Percentage as of
the Cut-Off Date, as set forth in Section 11.10.

            Original  Class B-4  Percentage:  The  Class B-4  Percentage as of
the Cut-Off Date, as set forth in Section 11.11.

            Original  Class B-5  Percentage:  The  Class B-5  Percentage as of
the Cut-Off Date, as set forth in Section 11.12.

            Original  Class B-6  Percentage:  The  Class B-6  Percentage as of
the Cut-Off Date, as set forth in Section 11.13.

            Original  Class B-1  Principal  Balance:  The Class B-1  Principal
Balance as of the Cut-Off Date, as set forth in Section 11.15.

            Original  Class B-2  Principal  Balance:  The Class B-2  Principal
Balance as of the Cut-Off Date, as set forth in Section 11.15.

            Original  Class B-3  Principal  Balance:  The Class B-3  Principal
Balance as of the Cut-Off Date, as set forth in Section 11.15.

            Original  Class B-4  Principal  Balance:  The Class B-4  Principal
Balance as of the Cut-Off Date, as set forth in Section 11.15.

            Original  Class B-5  Principal  Balance:  The Class B-5  Principal
Balance as of the Cut-Off Date, as set forth in Section 11.15.

            Original  Class B-6  Principal  Balance:  The Class B-6  Principal
Balance as of the Cut-Off Date, as set forth in Section 11.15.

            Original Principal  Balance:  Any of the Original Principal Balances
of the  Classes  of Class A  Certificates  as set forth in  Section  11.05;  the
Original  Class B-1 Principal  Balance,  Original  Class B-2 Principal  Balance,
Original  Class B-3 Principal  Balance,  Original  Class B-4 Principal  Balance,
Original Class B-5 Principal  Balance or Original Class B-6 Principal Balance as
set forth in Section 11.15.

            Original Subordinated  Percentage:  The Subordinated Percentage as
of the Cut-Off Date, as set forth in Section 11.07.

            Other Servicer:  Any of the Servicers other than Norwest Mortgage.

            Other Servicing  Agreements:  The Servicing  Agreements other than
the Norwest Servicing Agreement.

            Outstanding  Mortgage  Loan:  As to any Due Date,  a  Mortgage  Loan
(including an REO Mortgage Loan) which was not the subject of a Full Unscheduled
Principal  Receipt prior to such Due Date and which was not  repurchased  by the
Seller prior to such Due Date pursuant to Section 2.02 or 2.03.

            Owner   Mortgage   Loan  File:  A  file   maintained  by  the  Trust
Administrator  (or the  Custodian,  if any) for each Mortgage Loan that contains
the  documents  specified in the  Servicing  Agreements  under their  respective
"Owner  Mortgage  Loan File"  definition  or  similar  definition  and/or  other
provisions  requiring  delivery  of  specified  documents  to the  owner  of the
Mortgage  Loan in  connection  with the  purchase  thereof,  and any  additional
documents  required to be added to the Owner Mortgage Loan File pursuant to this
Agreement.

            Partial Liquidation  Proceeds:  Liquidation Proceeds received by a
Servicer  prior to the  month in which  the  related  Mortgage  Loan  became a
Liquidated Loan.

            Partial Unscheduled  Principal Receipt:  An Unscheduled  Principal
Receipt which is not a Full Unscheduled Principal Receipt.

            Paying  Agent:  The  Person   authorized  on  behalf  of  the  Trust
Administrator,  as agent  for the  Master  Servicer,  to make  distributions  to
Certificateholders   with  respect  to  the   Certificates  and  to  forward  to
Certificateholders  the periodic and annual statements required by Section 4.04.
The  Paying  Agent may be any  Person  directly  or  indirectly  controlling  or
controlled  by or under common  control with the Master  Servicer and may be the
Trustee or the Trust  Administrator.  The initial  Paying  Agent is appointed in
Section 4.03(a).

            Payment   Account:    The   account    maintained    pursuant   to
Section 4.03(b).

            Percentage  Interest:  With  respect to a Class A  Certificate  of a
Class (other than a Class A-3 Certificate),  the undivided  percentage  interest
obtained by dividing the original  principal  balance of such Certificate by the
Original  Principal Balance of such Class of Class A Certificates.  With respect
to a Class A-3  Certificate,  the  undivided  percentage  interest  obtained  by
dividing the current  principal  balance of such  Certificate  by the  Principal
Balance of the Class A-3 Certificates.  With respect to a Class B Certificate of
a Class,  the undivided  percentage  interest  obtained by dividing the original
principal balance of such Certificate by the Original  Principal Balance of such
Class of Class B Certificates.

            Periodic Advance:  The aggregate of the advances required to be made
by a Servicer on any Distribution Date pursuant to its Servicing Agreement or by
the Master Servicer or the Trust Administrator hereunder, the amount of any such
advances  being equal to the total of all Monthly  Payments  (adjusted,  in each
case (i) in respect of interest,  to the applicable  Mortgage Interest Rate less
the applicable Servicing Fee in the case of Periodic Advances made by a Servicer
and to the  applicable  Net  Mortgage  Interest  Rate in the  case  of  Periodic
Advances  made by the Master  Servicer  or Trust  Administrator  and (ii) by the
amount of any related Debt Service  Reductions  or  reductions  in the amount of
interest  collectable from the Mortgagor  pursuant to the Soldiers' and Sailors'
Civil Relief Act of 1940, as amended, or similar legislation or regulations then
in effect) on the Mortgage  Loans,  that (x) were  delinquent as of the close of
business  on the  related  Determination  Date,  (y) were not the  subject  of a
previous  Periodic  Advance by such  Servicer  or of a  Periodic  Advance by the
Master Servicer or the Trust Administrator,  as the case may be and (z) have not
been determined by the Master Servicer,  such Servicer or Trust Administrator to
be Nonrecoverable Advances.

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

            Plan:  As defined in Section 5.02(c).

            PO  Fraction:  With  respect  to any  Discount  Mortgage  Loan,  the
difference  between 1.0 and the Non-PO  Fraction for such  Mortgage  Loan;  with
respect to any other Mortgage Loan, zero.

            Policy:  The  irrevocable  Ambac  Insurance  Policy No.  AB0265BE,
including  any  endorsements  thereto,  issued by Ambac  with  respect  to the
Class A-3 Certificates, in the form attached hereto as Exhibit N.

            Policy  Payments  Account:  The  account  maintained  pursuant  to
Section 4.08(b).

            Pool Balance (Non-PO Portion):  As of any Distribution Date, the sum
of the amounts for each  Mortgage Loan that is an  Outstanding  Mortgage Loan of
the  product  of (i) the Non-PO  Fraction  for such  Mortgage  Loan and (ii) the
Scheduled Principal Balance of such Mortgage Loan.

            Pool Balance (PO Portion):  As of any Distribution  Date, the sum of
the amounts for each Mortgage Loan that is an  Outstanding  Mortgage Loan of the
product of (i) the PO Fraction  for such  Mortgage  Loan and (ii) the  Scheduled
Principal Balance of such Mortgage Loan.

            Pool  Distribution  Amount:  As of any Distribution  Date, the funds
eligible  for   distribution  to  the  Holders  of  the   Certificates  on  such
Distribution  Date,  which shall be the sum of (i) all previously  undistributed
payments or other receipts on account of principal and interest on or in respect
of the  Mortgage  Loans  (including,  without  limitation,  the  proceeds of any
repurchase  of a  Mortgage  Loan by the Seller  and any  Substitution  Principal
Amount)  received  by  the  Master  Servicer  with  respect  to  the  applicable
Remittance  Date in the  month of such  Distribution  Date  and any  Unscheduled
Principal  Receipts  received by the Master Servicer on or prior to the Business
Day  preceding  such  Distribution  Date,  (ii) all Periodic  Advances made by a
Servicer pursuant to the related  Servicing  Agreement or Periodic Advances made
by the Master Servicer or the Trust  Administrator  pursuant to Section 3.03 and
(iii) all other amounts required to be placed in the Certificate  Account by the
Servicer on or before the applicable  Remittance  Date or by the Master Servicer
or the Trust  Administrator on or prior to the Distribution  Date, but excluding
the following:

            (a) amounts  received as late  payments of principal or interest and
      respecting which the Master Servicer or the Trust  Administrator  has made
      one or more unreimbursed Periodic Advances;

            (b)  the portion  of  Liquidation  Proceeds  used to  reimburse  any
      unreimbursed  Periodic  Advances  by the  Master  Servicer  or  the  Trust
      Administrator;

            (c)  those portions  of each  payment of  interest  on a  particular
      Mortgage Loan which  represent (i) the Fixed Retained  Yield, if any, (ii)
      the applicable Servicing Fee and (iii) the Master Servicing Fee;

            (d)  all amounts  representing scheduled  payments of principal  and
      interest  due after  the Due Date  occurring  in the  month in which  such
      Distribution Date occurs;

            (e)  all  Unscheduled  Principal Receipts  received by the Servicers
      after the Applicable  Unscheduled Principal Receipt Period relating to the
      Distribution  Date  for  the  applicable  type  of  Unscheduled  Principal
      Receipt, and all related payments of interest on such amounts;

            (f)  all   repurchase   proceeds  with  respect  to  Mortgage  Loans
      repurchased by the Seller pursuant to Section 2.02 or 2.03 on or following
      the Due Date in the month in which such  Distribution  Date occurs and the
      difference  between the unpaid  principal  balance of such  Mortgage  Loan
      substituted  for a defective  Mortgage Loan during the month preceding the
      month in which such  Distribution  Date  occurs  and the unpaid  principal
      balance of such defective Mortgage Loan;

            (g)  that portion of  Liquidation  Proceeds and REO  Proceeds  which
      represents any unpaid Servicing Fee or Master Servicing Fee;

            (h)  all  income  from  Eligible  Investments  that  is  held in the
      Certificate Account for the account of the Master Servicer;

            (i) all other amounts permitted to be withdrawn from the Certificate
      Account in respect of the  Mortgage  Loans,  to the extent not  covered by
      clauses (a)  through (h) above,  or not  required to be  deposited  in the
      Certificate Account under this Agreement;

            (j)  Net Foreclosure Profits;

            (k)  Month End Interest; and

            (l)  the amount of any Recoveries in respect of principal  which had
      previously  been allocated as a loss to one or more Classes of the Class A
      or Class B  Certificates  pursuant to Section  4.02 other than  Recoveries
      covered by the last sentence of Section 4.02(d).

            Pool Scheduled  Principal Balance:  As to any Distribution Date, the
aggregate   Scheduled  Principal  Balances  of  all  Mortgage  Loans  that  were
Outstanding  Mortgage Loans on the Due Date in the month  preceding the month of
such Distribution Date.

            Premium Payment: As to any Distribution Date, (i) the product of (a)
1/12th  of  0.060%  and (b) the  Class A  Principal  Balance  of the  Class  A-3
Certificates  as  of  the   Determination   Date   immediately   preceding  such
Distribution  Date minus (ii) the Premium  Percentage  of (x) any  Non-Supported
Interest Shortfall allocated to the Class A Certificates and the Premium Payment
with respect to such  Distribution  Date, (y) the interest portion of any Excess
Special  Hazard  Losses,  Excess  Fraud  Losses  and  Excess  Bankruptcy  Losses
allocated to the Class A  Certificates  and the Premium  Payment with respect to
such  Distribution Date pursuant to Section 4.02(e) and (z) the interest portion
of any Realized  Losses (other than Excess Special  Hazard Losses,  Excess Fraud
Losses and Excess  Bankruptcy  Losses) allocated to the Class A Certificates and
the Premium Payment on or after the Cross-Over Date pursuant to Section 4.02(e).
The Premium Payment will be an expense of the REMIC.

            Premium  Percentage:  As to any  Distribution  Date,  the percentage
calculated by dividing the Premium Payment  (determined without regard to clause
(ii) of the definition  thereof) by the sum of (a) the Class A Interest  Accrual
Amount  (determined  without  regard to clause  (ii) of the  definition  of each
Interest Accrual Amount) and (b) the Premium Payment  (determined without regard
to clause (ii) of the definition of Premium Payment).

            Premium Shortfall Amount: As to any Distribution Date, any amount by
which the Premium  Payment  with respect to such  Distribution  Date exceeds the
amount  distributed  to Ambac on such  Distribution  Date  pursuant to Paragraph
first of Section 4.01(a).

            Premium Unpaid Shortfall:  As to any Distribution  Date, the amount,
if any,  by which the  aggregate  of the  Premium  Shortfall  Amounts  for prior
Distribution  Dates is in excess of the  amounts  distributed  to Ambac on prior
Distribution Dates pursuant to Paragraph second of Section 4.01(a).

            Prepayment In Full:  With respect to any Mortgage  Loan, a Mortgagor
payment  consisting of a Principal  Prepayment in the amount of the  outstanding
principal  balance of such loan and resulting in the full  satisfaction  of such
obligation.

            Prepayment Interest Shortfall:  On any Distribution Date, the amount
of interest,  if any, that would have accrued on any Mortgage Loan which was the
subject  of a  Prepayment  in Full at the Net  Mortgage  Interest  Rate for such
Mortgage  Loan  from the date of its  Prepayment  in Full  (but in the case of a
Prepayment in Full where the Applicable  Unscheduled Principal Receipt Period is
the Mid-Month  Receipt Period,  only if the date of the Prepayment in Full is on
or  after  the  Determination  Date in the  month  prior  to the  month  of such
Distribution  Date and prior to the first day of the month of such  Distribution
Date) through the last day of the month prior to the month of such  Distribution
Date.

            Principal  Adjustment:  In the  event  that the  Class  B-1  Optimal
Principal  Amount,  Class  B-2  Optimal  Principal  Amount,  Class  B-3  Optimal
Principal  Amount,  Class  B-4  Optimal  Principal  Amount,  Class  B-5  Optimal
Principal  Amount  or Class  B-6  Optimal  Principal  Amount  is  calculated  in
accordance with the proviso in such definition with respect to any  Distribution
Date,  the Principal  Adjustment  for such Class of Class B  Certificates  shall
equal the difference  between (i) the amount that would have been distributed to
such Class as principal in accordance with Section 4.01(a) for such Distribution
Date,  calculated  without  regard to such  proviso  and  assuming  there are no
Principal Adjustments for such Distribution Date and (ii) the Adjusted Principal
Balance for such Class.

            Principal Balance:  As of the first Determination Date and as to any
Class of Class A Certificates,  the Original Principal Balance of such Class. As
of any subsequent  Determination Date prior to the Cross-Over Date and as to any
Class of Class A  Certificates  (other  than the Class A-PO  Certificates),  the
Original  Principal  Balance  of such  Class  less  the  sum of (a) all  amounts
previously  distributed in respect of such Class on prior Distribution Dates (i)
pursuant to Paragraph  third clause (A) of Section  4.01(a) and (ii) as a result
of a Principal  Adjustment and (b) the Realized  Losses  allocated  through such
Determination  Date to  such  Class  pursuant  to  Section  4.02(b).  After  the
Cross-Over  Date,  each such  Principal  Balance  will also be  reduced  on each
Determination  Date  by an  amount  equal  to the  product  of the  Class A Loss
Percentage  of such  Class  and the  excess,  if any,  of (i) the Class A Non-PO
Principal Balance as of such  Determination Date without regard to this sentence
over (ii) the difference  between (A) the Adjusted Pool Amount for the preceding
Distribution  Date  and  (B) the  Adjusted  Pool  Amount  (PO  Portion)  for the
preceding Distribution Date.

            As of any subsequent Determination Date prior to the Cross-Over Date
and as to the Class A-PO  Certificates,  the Original  Principal Balance of such
Class less the sum of (a) all amounts  previously  distributed in respect of the
Class A-PO Certificates on prior Distribution Dates pursuant to Paragraphs third
clause (B) and fourth of Section 4.01(a) and (b) the Realized  Losses  allocated
through  such  Determination  Date to the Class A-PO  Certificates  pursuant  to
Section 4.02(b).  After the Cross-Over Date, such Principal Balance will also be
reduced on each Determination Date by an amount equal to the difference, if any,
between such Principal Balance as of such  Determination  Date without regard to
this  sentence  and the  Adjusted  Pool Amount (PO  Portion)  for the  preceding
Distribution Date.

            As to the Class B  Certificates,  the Class B-1  Principal  Balance,
Class B-2 Principal Balance,  Class B-3 Principal  Balance,  Class B-4 Principal
Balance,   Class  B-5  Principal  Balance  and  Class  B-6  Principal   Balance,
respectively.

            Principal Prepayment: Any Mortgagor payment on a Mortgage Loan which
is  received  in  advance  of its Due Date and is not  accompanied  by an amount
representing  scheduled  interest  for  any  period  subsequent  to the  date of
prepayment.

            Prior Month Receipt Period:  With respect to each Distribution Date,
the calendar month preceding the month in which such Distribution Date occurs.

            Prohibited  Transaction  Tax: Any tax imposed  under  Section 860F
of the Code.

            Prudent  Servicing  Practices:  The  standard of care set forth in
each Servicing Agreement.

            Rating Agency: Any nationally  recognized  statistical credit rating
agency, or its successor,  that rated one or more Classes of the Certificates at
the  request  of  the  Seller  at  the  time  of  the  initial  issuance  of the
Certificates.  The Rating  Agencies for the Class A  Certificates  are Fitch and
S&P. The Rating Agency for the Class B-1,  Class B-2,  Class B-3,  Class B-4 and
Class B-5  Certificates is Fitch. If any 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 Seller,  notice of which designation
shall be given to the  Trustee,  the Trust  Administrator,  Ambac and the Master
Servicer.  References  herein to the  highest  short-term  rating  category of a
Rating Agency shall mean F-1+ in the case of Fitch,  A-1+ in the case of S&P and
in the  case of any  other  Rating  Agency  shall  mean its  equivalent  of such
ratings.  References  herein to the highest  long-term  rating  categories  of a
Rating  Agency shall mean AAA, and in the case of any other Rating  Agency shall
mean its equivalent of such rating without any plus or minus.

            Realized  Losses:   With  respect  to  any  Distribution  Date,  (i)
Liquidated  Loan Losses  (including  Special Hazard Losses and Fraud Losses) and
(ii)  Bankruptcy  Losses  incurred  in the  month  preceding  the  month of such
Distribution Date.

            Record  Date:  The last  Business Day of the month  preceding  the
month of the related Distribution Date.

            Recovery:  Any amount  received on a Mortgage  Loan  subsequent to
such Mortgage Loan being determined to be a Liquidated Loan.

            Relevant Anniversary:  See "Bankruptcy Loss Amount."

            REMIC: A "real estate mortgage  investment  conduit" as defined in
Code  Section 860D.  "The REMIC" means the REMIC  constituted by the assets of
the Trust Estate other than the Reserve Fund.

            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  are in  effect  (or  with  respect  to  proposed
regulations, are proposed to be in effect) from time to time.

            Remittance Date:  As defined in each of the Servicing Agreements.

            REO Mortgage Loan: Any Mortgage Loan which is not a Liquidated  Loan
and as to which the  indebtedness  evidenced  by the  related  Mortgage  Note is
discharged  and the  related  Mortgaged  Property  is held as part of the  Trust
Estate.

            REO Proceeds:  Proceeds received in respect of any REO Mortgage Loan
(including,  without  limitation,  proceeds  from  the  rental  of  the  related
Mortgaged Property).

            Request for Release:  A request for release in  substantially  the
form attached as Exhibit G hereto.

            Reserve Fund:  The  non-interest  bearing trust account  established
with the Trust  Administrator and maintained by the Trust  Administrator for the
benefit of the Class A-3 Certificateholders pursuant to Section 4.06.  The
Reserve Fund shall be an Eligible Account.

            Reserve  Withdrawal:  With  respect to any  Distribution  Date,  the
lesser of (a) the amount on deposit  in the  Reserve  Fund and (b) the amount of
Non-Supported Interest Shortfalls allocated to the Class A-3 Certificates.

            Responsible  Officer:  When used with  respect to the Trustee or the
Trust Administrator,  the Chairman or Vice-Chairman of the Board of Directors or
Trustees,  the Chairman or Vice-Chairman of the Executive or Standing  Committee
of the Board of  Directors  or  Trustees,  the  President,  the  Chairman of the
Committee on Trust Matters,  any Vice  President,  the Secretary,  any Assistant
Secretary,  the Treasurer,  any Assistant Treasurer,  the Cashier, any Assistant
Cashier,  any Trust Officer or Assistant  Trust Officer,  the Controller and any
Assistant  Controller  or  any  other  officer  of  the  Trustee  or  the  Trust
Administrator,  as the case may be, 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.

            Rounding Account:  The special account  established with the Trust
Administrator  and maintained by the Trust  Administrator  pursuant to Section
4.07(e).  The Rounding Account shall be an Eligible Account.

            Rounding  Amount:  With  respect  to any  Distribution  Date,  the
amount,  if any,  required to be withdrawn from the Rounding  Account pursuant
to Section 4.07(e).

            Rule 144A: Rule 144A  promulgated  under the Securities Act of 1933,
as amended.

            S&P:  Standard & Poor's, or its successor in interest.

            Scheduled   Principal   Balance:   As  to  any  Mortgage   Loan  and
Distribution  Date,  the  principal  balance of such Mortgage Loan as of the Due
Date in the month preceding the month of such  Distribution Date as specified in
the amortization schedule at the time relating thereto (before any adjustment to
such  amortization  schedule by reason of any  bankruptcy  (other than Deficient
Valuations)  or similar  proceeding or any moratorium or similar waiver or grace
period) after giving effect to (A) Unscheduled  Principal  Receipts  received or
applied by the  applicable  Servicer  during the related  Unscheduled  Principal
Receipt Period for each applicable type of Unscheduled Principal Receipt related
to the  Distribution  Date occurring in the month  preceding  such  Distribution
Date,  (B)  Deficient  Valuations  incurred  prior  to such Due Date and (C) the
payment of principal due on such Due Date and irrespective of any delinquency in
payment by the related Mortgagor.  Accordingly,  the Scheduled Principal Balance
of a Mortgage Loan which becomes a Liquidated  Loan at any time through the last
day of such related Unscheduled Principal Receipt Period shall be zero.

            Seller:  Norwest Asset  Securities  Corporation,  or its successor
in interest.

            Servicer  Mortgage  Loan File: As defined in each of the Servicing
Agreements.

            Servicers:  Each of  Norwest  Mortgage,  The  Huntington  Mortgage
Company,  First  Union  Mortgage  Corp.,  Citicorp  Mortgage,  Inc.  and  GMAC
Mortgage Corporation, as Servicer under the related Servicing Agreement.

            Servicing Agreements: Each of the Servicing Agreements executed with
respect  to a  portion  of the  Mortgage  Loans by one of the  Servicers,  which
agreements are attached hereto, collectively, as Exhibit L.

            Servicing  Fee:  With respect to any  Servicer,  as defined in its
Servicing Agreement.

            Servicing  Fee Rate:  With  respect  to a  Mortgage  Loan,  as set
forth in Section 11.25.

            Servicing  Officer:  Any  officer  of a Servicer  involved  in, or
responsible for, the administration and servicing of the Mortgage Loans.

            Similar Law:  As defined in Section 5.02(c).

            Single  Certificate:  A  Certificate  of any Class that  evidences
the  smallest  permissible  Denomination  for  such  Class,  as set  forth  in

Section 11.24.

            Special  Hazard  Loss:  (i) A  Liquidated  Loan Loss  suffered  by a
Mortgaged Property on account of direct physical loss, exclusive of (a) any loss
covered by a hazard policy or a flood insurance policy  maintained in respect of
such  Mortgaged  Property  pursuant  to a Servicing  Agreement  and (b) any loss
caused by or resulting from:

            (1)   normal wear and tear;

            (2)   infidelity,  conversion or other  dishonest act on the part of
                  the Trustee, the Trust Administrator or the Servicer or any of
                  their agents or employees; or

            (3)   errors in  design,  faulty  workmanship  or faulty  materials,
                  unless the collapse of the property or a part thereof ensues;

or (ii) any  Liquidated  Loan Loss suffered by the Trust Estate  arising from or
related to the presence or suspected  presence of hazardous  wastes or hazardous
substances on a Mortgaged  Property unless such loss to a Mortgaged  Property is
covered by a hazard policy or a flood insurance policy  maintained in respect of
such Mortgaged Property pursuant to the Servicing Agreement.

            Special Hazard Loss Amount:  As of any Distribution  Date, an amount
equal to  $2,357,418.60  minus the sum of (i) the  aggregate  amount of  Special
Hazard Losses  allocated  solely to the Class B Certificates  in accordance with
Section 4.02(a) and (ii) the Special Hazard Adjustment Amount (as defined below)
as most recently  calculated.  For each  anniversary  of the Cut-Off  Date,  the
Special Hazard  Adjustment  Amount shall be calculated and shall be equal to the
amount,  if any, by which the amount calculated in accordance with the preceding
sentence  (without  giving  effect  to  the  deduction  of  the  Special  Hazard
Adjustment Amount for such  anniversary)  exceeds the greater of (A) the product
of  the  Special  Hazard  Percentage  for  such  anniversary  multiplied  by the
outstanding principal balance of all the Mortgage Loans on the Distribution Date
immediately  preceding such  anniversary,  (B) twice the  outstanding  principal
balance  of the  Mortgage  Loan  in the  Trust  Estate  which  has  the  largest
outstanding  principal  balance on the Distribution  Date immediately  preceding
such  anniversary  and (C) that which is  necessary  to  maintain  the  original
ratings on the  Certificates as evidenced by letters to that effect delivered by
Rating Agencies to the Master Servicer and the Trust Administrator. On and after
the Cross-Over Date, the Special Hazard Loss Amount shall be zero.

            Special  Hazard  Percentage:  As of each  anniversary of the Cut-Off
Date,  the  greater of (i) 1.05% and (ii) the  largest  percentage  obtained  by
dividing the  aggregate  outstanding  principal  balance (as of the  immediately
preceding  Distribution  Date)  of  the  Mortgage  Loans  secured  by  Mortgaged
Properties  located  in a  single,  five-digit  zip  code  area in the  State of
California by the outstanding  principal balance of all the Mortgage Loans as of
the immediately preceding Distribution Date.

            Startup Day:  As defined in Section 2.05.

            Subordinated   Percentage:   As  to  any  Distribution  Date,  the
percentage  which is the  difference  between 100% and the Class A  Percentage
for such date.

            Subordinated  Prepayment Percentage:  As to any Distribution Date,
the  percentage  which  is  the  difference   between  100%  and  the  Class A
Prepayment Percentage for such date.

            Subsidy  Loan:  Any Mortgage  Loan  subject to a temporary  interest
subsidy  agreement  pursuant to which the monthly interest  payments made by the
related  Mortgagor will be less than the scheduled  monthly interest payments on
such Mortgage  Loan,  with the resulting  difference in interest  payments being
provided by the employer of the Mortgagor.  Each Subsidy Loan will be identified
as such in the Mortgage Loan Schedule.

            Substitute Mortgage Loan:  As defined in Section 2.02.

            Substitution  Principal  Amount:  With respect to any Mortgage  Loan
substituted  in accordance  with Section 2.02 or pursuant to Section  2.03,  the
excess  of (x) the  unpaid  principal  balance  of the  Mortgage  Loan  which is
substituted for over (y) the unpaid principal balance of the Substitute Mortgage
Loan, each balance being determined as of the date of substitution.

            Trust  Administrator:  First Union National Bank, a national banking
association with its principal office located in Charlotte,  North Carolina,  or
any successor trust administrator appointed as herein provided.

            Trust  Estate:  The corpus of the trust  created by this  Agreement,
consisting of the Mortgage  Loans (other than any Fixed  Retained  Yield),  such
amounts as may be held from time to time in the Certificate  Account (other than
any Fixed Retained Yield), the rights of the Trust  Administrator,  on behalf of
the Trustee,  to receive the proceeds of all insurance  policies and performance
bonds,  if any,  required  to be  maintained  hereunder  or  under  the  related
Servicing  Agreement,  property which secured a Mortgage Loan and which has been
acquired by foreclosure or deed in lieu of foreclosure, the Reserve Fund and the
rights of the Trust  Administrator  under the Policy.  None of the Reserve Fund,
the Policy or the Policy Payments Account shall be part of the REMIC.

            Trustee:   United  States  Trust  Company  of  New  York,  or  any
successor trustee appointed as herein provided.

            Unpaid  Interest  Shortfalls:  Each of the Class A Unpaid Interest
Shortfalls,  the Class B-1  Unpaid Interest  Shortfall,  the Class B-2  Unpaid
Interest  Shortfall,  the Class B-3 Unpaid Interest  Shortfall,  the Class B-4
Unpaid Interest  Shortfall,  the Class B-5  Unpaid Interest  Shortfall and the
Class B-6 Unpaid Interest Shortfall.

            Unscheduled  Principal  Receipt:  Any Principal  Prepayment or other
recovery  of  principal  on a  Mortgage  Loan,  including,  without  limitation,
Liquidation   Proceeds,   Net  REO  Proceeds  and  proceeds  received  from  any
condemnation  award or proceeds in lieu of condemnation  other than that portion
of such proceeds  released to the Mortgagor in accordance  with the terms of the
Mortgage or Prudent  Servicing  Practices,  but  excluding  any Net  Foreclosure
Profits and  proceeds of a repurchase  of a Mortgage  Loan by the Seller and any
Substitution  Principal  Amounts.  Except as set forth in the last  sentence  of
Section  4.02(d),  a Recovery shall not be treated as an  Unscheduled  Principal
Receipt.

            Unscheduled  Principal Receipt Period:  Either a Mid-Month Receipt
Period or a Prior Month Receipt Period.

            U.S. Person:  As defined in Section 4.01(f).

            Voting Interest: With respect to any provisions hereof providing for
the action,  consent or approval of the Holders of all  Certificates  evidencing
specified  Voting  Interests in the Trust  Estate,  the Holders of each Class of
Certificates will collectively be entitled to the then applicable  percentage of
the aggregate Voting Interest represented by all Certificates equal to the ratio
obtained by dividing the Principal Balance of such Class by the sum of the Class
A Principal Balance and the Class B Principal Balance. Each Certificateholder of
a Class will have a Voting  Interest equal to the product of the Voting Interest
to which such Class is collectively entitled and the Percentage Interest in such
Class represented by such Holder's Certificates.  With respect to any provisions
hereof  providing for action,  consent or approval of each Class of Certificates
or specified  Classes of Certificates,  each  Certificateholder  of a Class will
have a Voting Interest in such Class equal to such Holder's  Percentage Interest
in such Class.

            Weighted Average Net Mortgage  Interest Rate: As to any Distribution
Date,  a rate per annum equal to the average,  expressed as a percentage  of the
Net Mortgage Interest Rates of all Mortgage Loans that were Outstanding Mortgage
Loans as of the Due Date in the month  preceding the month of such  Distribution
Date,  weighted on the basis of the respective  Scheduled  Principal Balances of
such Mortgage Loans.

            SECTION 1.02      ACTS OF HOLDERS.

            (a)   Any  request,  demand,   authorization,   direction,   notice,
consent,  waiver or other action provided by this Agreement to be given or taken
by Holders  may be  embodied  in and  evidenced  by one or more  instruments  of
substantially similar tenor signed by such Holders in person or by an agent duly
appointed in writing. Except as herein otherwise expressly provided, such action
shall become  effective when such instrument or instruments are delivered to the
Trustee and the Trust  Administrator.  Proof of execution of any such instrument
or of a writing appointing any such agent shall be sufficient for any purpose of
this   Agreement  and   conclusive  in  favor  of  the  Trustee  and  the  Trust
Administrator,  if made in the manner provided in this Section 1.02. The Trustee
shall promptly  notify the Master Servicer in writing of the receipt of any such
instrument or writing.

            (b)   The  fact and date of the  execution by any Person of any such
instrument  or  writing  may be proved  by the  affidavit  of a witness  of such
execution or by a certificate of a notary public or other officer  authorized by
law to take  acknowledgments  of deeds,  certifying that the individual  signing
such instrument or writing acknowledged to him the execution thereof.  When such
execution is by a signer acting in a capacity  other than his or her  individual
capacity,  such certificate or affidavit shall also constitute  sufficient proof
of his or her  authority.  The  fact  and  date  of the  execution  of any  such
instrument or writing,  or the authority of the  individual  executing the same,
may  also  be  proved  in any  other  manner  which  the  Trustee  or the  Trust
Administrator deems sufficient.

            (c)   The   ownership   of   Certificates   (whether   or  not  such
Certificates shall be overdue and  notwithstanding  any notation of ownership or
other  writing  thereon  made by  anyone  other  than  the  Trustee,  the  Trust
Administrator and the  Authenticating  Agent) shall be proved by the Certificate
Register,  and neither the Trustee, the Trust Administrator,  the Seller nor the
Master Servicer shall be affected by any notice to the contrary.

            (d)   Any  request,  demand,   authorization,   direction,   notice,
consent,  waiver or other  action of the  Holder of any  Certificate  shall bind
every future Holder of the same Certificate and the Holder of every  Certificate
issued upon the registration of transfer  thereof or in exchange  therefor or in
lieu thereof in respect of anything done,  omitted or suffered to be done by the
Trustee, the Trust Administrator,  the Seller or the Master Servicer in reliance
thereon, whether or not notation of such action is made upon such Certificate.

            SECTION 1.03      EFFECT OF HEADINGS AND TABLE OF CONTENTS.

            The Article and Section  headings in this Agreement and the Table of
Contents  are for  convenience  of  reference  only and  shall  not  affect  the
interpretation or construction of this Agreement.

            SECTION 1.04      BENEFITS OF AGREEMENT.

            Nothing  in  this  Agreement  or in  the  Certificates,  express  or
implied,  shall give to any Person, other than the parties to this Agreement and
their  successors  hereunder and the Holders of the  Certificates  and Ambac any
benefit  or any legal or  equitable  right,  power,  remedy or claim  under this
Agreement.


<PAGE>







                                   ARTICLE II

                          CONVEYANCE OF MORTGAGE LOANS;

                      ORIGINAL ISSUANCE OF THE CERTIFICATES

            SECTION 2.01      CONVEYANCE OF MORTGAGE LOANS.

            The Seller,  concurrently  with the execution  and delivery  hereof,
does hereby  assign to the Trustee,  without  recourse all the right,  title and
interest of the Seller in and to (a) the Trust  Estate,  including  all interest
(other than the portion,  if any,  representing  the Fixed  Retained  Yield) and
principal  received by the Seller on or with respect to the Mortgage Loans after
the Cut-Off Date (and including scheduled payments of principal and interest due
after the Cut-Off  Date but received by the Seller on or before the Cut-Off Date
and Unscheduled  Principal Receipts received or applied on the Cut-Off Date, but
not including payments of principal and interest due on the Mortgage Loans on or
before the Cut-Off Date), (b) the Insurance Policies, (c) the obligations of the
Servicers under the Servicing  Agreements with respect to the Mortgage Loans and
(d) proceeds of all the foregoing.

            In connection with such assignment,  the Seller shall,  with respect
to  each  Mortgage  Loan,  deliver,  or  cause  to be  delivered,  to the  Trust
Administrator,  as initial  Custodian,  on or before the Closing  Date, an Owner
Mortgage  Loan File. If any Mortgage or an assignment of a Mortgage to the Trust
Administrator or any prior assignment is in the process of being recorded on the
Closing  Date,  the Seller shall  deliver a copy  thereof,  certified by Norwest
Mortgage  or the  applicable  Norwest  Mortgage  Correspondent  to be a true and
complete copy of the document sent for  recording,  and the Seller shall use its
best efforts to cause each such  original  recorded  document or certified  copy
thereof  to be  delivered  to the Trust  Administrator  promptly  following  its
recordation, but in no event later than one (1) year following the Closing Date.
The Seller shall also cause to be delivered to the Trust Administrator any other
original  mortgage loan document to be included in the Owner  Mortgage Loan File
if a copy thereof has been  delivered.  The Seller shall pay from its own funds,
without  any  right  of  reimbursement   therefor,  the  amount  of  any  costs,
liabilities  and expenses  incurred by the Trust Estate by reason of the failure
of the Seller to cause to be delivered to the Trust Administrator within one (1)
year  following  the  Closing  Date any  original  Mortgage or  assignment  of a
Mortgage not delivered to the Trust Administrator on the Closing Date.

            In lieu of recording an  assignment  of any Mortgage the Seller may,
to the extent set forth in the applicable Servicing Agreement,  deliver or cause
to be delivered to the Trust  Administrator  the assignment of the Mortgage Loan
from the Seller to the Trust  Administrator  in a form suitable for recordation,
together with an Opinion of Counsel to the effect that recording is not required
to  protect  the  Trustee's  right,  title and  interest  in and to the  related
Mortgage Loan or, in case a court should recharacterize the sale of the Mortgage
Loans as a financing,  to perfect a first priority security interest in favor of
the Trustee in the related  Mortgage Loan. In the event that the Master Servicer
receives  notice that  recording  is  required  to protect the right,  title and
interest of the Trustee in and to any such Mortgage  Loan for which  recordation
of an assignment has not previously  been  required,  the Master  Servicer shall
promptly notify the Trust Administrator and the Trust Administrator shall within
five Business Days (or such other reasonable period of time mutually agreed upon
by the  Master  Servicer  and the Trust  Administrator)  of its  receipt of such
notice deliver each previously unrecorded assignment to the related Servicer for
recordation.

            SECTION 2.02      ACCEPTANCE BY TRUST ADMINISTRATOR.

            The Trust  Administrator,  on behalf  of the  Trustee,  acknowledges
receipt  of the  Mortgage  Notes,  the  Mortgages,  the  assignments  and  other
documents  required to be delivered on the Closing Date pursuant to Section 2.01
above and  declares  that it holds and will  hold such  documents  and the other
documents  constituting a part of the Owner Mortgage Loan Files  delivered to it
in trust,  upon the  trusts  herein set  forth,  for the use and  benefit of all
present and future  Certificateholders.  The Trust Administrator agrees, for the
benefit of Certificateholders, to review each Owner Mortgage Loan File within 45
days after  execution of this  Agreement in order to ascertain that all required
documents  set forth in Section 2.01 have been  executed and received and appear
regular on their face,  and that such  documents  relate to the  Mortgage  Loans
identified  in  the  Mortgage  Loan   Schedule,   and  in  so  doing  the  Trust
Administrator  may rely on the purported due  execution and  genuineness  of any
such document and on the purported  genuineness  of any  signature  thereon.  If
within  such  45  day  period  the  Trust   Administrator   finds  any  document
constituting  a part of an Owner Mortgage Loan File not to have been executed or
received or to be  unrelated to the Mortgage  Loans  identified  in the Mortgage
Loan  Schedule  or not to appear  regular on its face,  the Trust  Administrator
shall  promptly  (and in no event more than 30 days after the  discovery of such
defect)  notify the Seller,  which shall have a period of 60 days after the date
of such  notice  within  which to  correct or cure any such  defect.  The Seller
hereby  covenants and agrees that, if any material defect is not so corrected or
cured,  the Seller will, not later than 60 days after the Trust  Administrator's
notice to it referred to above respecting such defect, either (i) repurchase the
related Mortgage Loan or any property acquired in respect thereof from the Trust
Estate at a price  equal to (a) 100% of the  unpaid  principal  balance  of such
Mortgage Loan plus (b) accrued interest at the Mortgage  Interest Rate, less any
Fixed Retained Yield, through the last day of the month in which such repurchase
takes place or (ii) if within two years of the Startup Day, or such other period
permitted by the REMIC  Provisions,  substitute  for any Mortgage  Loan to which
such material defect relates, a new mortgage loan (a "Substitute Mortgage Loan")
having such  characteristics so that the  representations  and warranties of the
Seller set forth in Section 2.03(b) hereof (other than Section 2.03(b)(i)) would
not have been  incorrect had such  Substitute  Mortgage Loan  originally  been a
Mortgage  Loan.  In no event shall any  Substitute  Mortgage Loan have an unpaid
principal  balance,  as of the date of substitution,  greater than the Scheduled
Principal  Balance (reduced by the scheduled payment of principal due on the Due
Date in the  month  of  substitution)  of the  Mortgage  Loan  for  which  it is
substituted.   In  addition,   such  Substitute   Mortgage  Loan  shall  have  a
Loan-to-Value  Ratio less than or equal to and a Mortgage Interest Rate equal to
that of the Mortgage Loan for which it is substituted.

            In the case of a repurchased Mortgage Loan or property, the purchase
price shall be deposited by the Seller in the Certificate  Account maintained by
the Master  Servicer  pursuant  to  Section  3.01.  In the case of a  Substitute
Mortgage Loan, the Owner Mortgage Loan File relating  thereto shall be delivered
to the Trust Administrator and the Substitution Principal Amount,  together with
(i)  interest  on such  Substitution  Principal  Amount  at the  applicable  Net
Mortgage  Interest Rate to the following Due Date of such Mortgage Loan which is
being  substituted  for and (ii) an  amount  equal to the  aggregate  amount  of
unreimbursed  Periodic  Advances in respect of interest  previously  made by the
Servicer,  the Master Servicer or the Trust  Administrator  with respect to such
Mortgage  Loan,  shall be  deposited  in the  Certificate  Account.  The Monthly
Payment  on the  Substitute  Mortgage  Loan  for the Due  Date in the  month  of
substitution  shall not be part of the Trust  Estate.  Upon receipt by the Trust
Administrator  of written  notification of any such deposit signed by an officer
of the  Seller,  or the new Owner  Mortgage  Loan File,  as the case may be, the
Trust  Administrator shall release to the Seller the related Owner Mortgage Loan
File and shall execute and deliver such instrument of transfer or assignment, in
each case  without  recourse,  as shall be necessary to vest in the Seller legal
and beneficial  ownership of such  substituted  or repurchased  Mortgage Loan or
property.  It is  understood  and agreed  that the  obligation  of the Seller to
substitute a new Mortgage Loan for or  repurchase  any Mortgage Loan or property
as to which  such a  material  defect in a  constituent  document  exists  shall
constitute   the  sole  remedy   respecting   such  defect   available   to  the
Certificateholders,  the Trust  Administrator  on behalf of the  Trustee and the
Trustee  on  behalf  of  the  Certificateholders.   The  failure  of  the  Trust
Administrator to give any notice contemplated herein within forty-five (45) days
after the execution of this  Agreement  shall not affect or relieve the Seller's
obligation to repurchase any Mortgage Loan pursuant to this Section 2.02.

            The Trust  Administrator  may,  concurrently  with the execution and
delivery  hereof or at any time  thereafter,  enter into a  Custodial  Agreement
substantially  in the form of  Exhibit  E hereto  pursuant  to which  the  Trust
Administrator  appoints a Custodian to hold the Mortgage  Notes,  the Mortgages,
the assignments  and other  documents  related to the Mortgage Loans received by
the Trust  Administrator,  as agent for the  Trustee in trust for the benefit of
all  present  and future  Certificateholders,  which may  provide,  among  other
things,  that the Custodian shall conduct the review of such documents  required
under the first paragraph of this Section 2.02.

            SECTION 2.03    REPRESENTATIONS  AND  WARRANTIES  OF THE MASTER
SERVICER AND THE SELLER.

            (a)   The  Master  Servicer  hereby  represents  and warrants to the
Trustee and the Trust Administrator for the benefit of Certificateholders  that,
as of the date of execution of this Agreement: The Master Servicer is a national
banking  association  duly chartered and validly existing in good standing under
the laws of the United States;

            (i)   The  execution  and  delivery of this  Agreement by the Master
Servicer and its  performance  and  compliance  with the terms of this Agreement
will  not  violate  the  Master  Servicer's  corporate  charter  or  by-laws  or
constitute a default (or an event which,  with notice or lapse of time, or both,
would  constitute  a default)  under,  or result in the breach of, any  material
contract,  agreement or other instrument to which the Master Servicer is a party
or which may be applicable to the Master Servicer or any of its assets;

            (ii)  This Agreement, assuming  due  authorization, execution  and
delivery by the Trustee,  the Trust Administrator and the Seller,  constitutes a
valid, legal and binding obligation of the Master Servicer,  enforceable against
it in  accordance  with the  terms  hereof  subject  to  applicable  bankruptcy,
insolvency, reorganization,  moratorium and other laws affecting the enforcement
of creditors' rights generally and to general  principles of equity,  regardless
of whether such enforcement is considered in a proceeding in equity or at law;

            (iii)  The  Master Servicer  is not in default  with  respect to any
order or decree of any court or any order,  regulation or demand of any federal,
state,  municipal or governmental  agency, which default might have consequences
that would materially and adversely affect the condition (financial or other) or
operations of the Master  Servicer or its properties or might have  consequences
that would affect its performance hereunder; and

            (iv)   No litigation  is  pending  or,  to the  best  of the  Master
Servicer's  knowledge,  threatened  against  the  Master  Servicer  which  would
prohibit its entering into this  Agreement or performing its  obligations  under
this Agreement.

            It is understood and agreed that the  representations and warranties
set forth in this Section 2.03(a) shall survive delivery of the respective Owner
Mortgage Loan Files to the Trust Administrator or the Custodian.

            (b) The Seller hereby represents and warrants to the Trustee and the
Trust Administrator for the benefit of  Certificateholders  that, as of the date
of execution of this  Agreement,  with  respect to the Mortgage  Loans,  or each
Mortgage Loan, as the case may be:

            (i) The information set forth in the Mortgage Loan Schedule was true
and correct in all material  respects at the date or dates respecting which such
information is furnished as specified in the Mortgage Loan Schedule;

            (ii) Immediately  prior to the transfer and assignment  contemplated
herein,  the Seller was the sole owner and holder of the Mortgage  Loan free and
clear of any and all liens, pledges, charges or security interests of any nature
and has full right and authority to sell and assign the same;

            (iii) The Mortgage is a valid, subsisting and enforceable first lien
on the property therein described,  and the Mortgaged Property is free and clear
of all  encumbrances  and  liens  having  priority  over the  first  lien of the
Mortgage except for liens for real estate taxes and special  assessments not yet
due and  payable  and  liens or  interests  arising  under or as a result of any
federal,  state or local law,  regulation  or  ordinance  relating to  hazardous
wastes or  hazardous  substances,  and, if the related  Mortgaged  Property is a
condominium unit, any lien for common charges permitted by statute or homeowners
association  fees;  and  if the  Mortgaged  Property  consists  of  shares  of a
cooperative  housing  corporation,  any lien for amounts due to the  cooperative
housing  corporation  for  unpaid  assessments  or  charges  or any  lien of any
assignment of rents or maintenance  expenses  secured by the real property owned
by the cooperative  housing  corporation;  and any security  agreement,  chattel
mortgage  or  equivalent  document  related  to,  and  delivered  to  the  Trust
Administrator or to the Custodian with, any Mortgage establishes in the Seller a
valid and subsisting first lien on the property described therein and the Seller
has full right to sell and assign the same to the Trustee;

            (iv)  Neither the Seller nor any prior holder of the Mortgage or the
related  Mortgage Note has modified the Mortgage or the related Mortgage Note in
any material respect, satisfied,  canceled or subordinated the Mortgage in whole
or in part, released the Mortgaged Property in whole or in part from the lien of
the Mortgage, or executed any instrument of release, cancellation,  modification
or satisfaction,  except in each case as is reflected in an agreement  delivered
to the Trust Administrator or the Custodian pursuant to Section 2.01;

            (v)  All taxes, governmental  assessments, insurance  premiums,  and
water, sewer and municipal  charges,  which previously became due and owing have
been paid, or an escrow of funds has been  established,  to the extent permitted
by law, in an amount sufficient to pay for every such item which remains unpaid;
and the Seller has not  advanced  funds,  or received  any advance of funds by a
party other than the Mortgagor,  directly or indirectly  (except pursuant to any
Subsidy  Loan  arrangement)  for  the  payment  of any  amount  required  by the
Mortgage,  except for interest  accruing  from the date of the Mortgage  Note or
date of disbursement  of the Mortgage Loan proceeds,  whichever is later, to the
day which precedes by thirty days the first Due Date under the related  Mortgage
Note;

            (vi) The Mortgaged Property is undamaged by water, fire, earthquake,
earth  movement  other than  earthquake,  windstorm,  flood,  tornado or similar
casualty  (excluding casualty from the presence of hazardous wastes or hazardous
substances,  as to which the Seller makes no  representations),  so as to affect
adversely the value of the Mortgaged  Property as security for the Mortgage Loan
or the use for which the premises  were intended and to the best of the Seller's
knowledge, there is no proceeding pending or threatened for the total or partial
condemnation of the Mortgaged Property;

            (vii) The Mortgaged Property is free and clear of all mechanics' and
materialmen's liens or liens in the nature thereof; provided, however, that this
warranty  shall be  deemed  not to have  been  made at the  time of the  initial
issuance of the Certificates if a title policy affording, in substance, the same
protection  afforded by this warranty is furnished to the Trust Administrator by
the Seller;

            (viii)  Except  for  Mortgage  Loans  secured  by Co-op  Shares  and
Mortgage Loans secured by residential  long-term leases,  the Mortgaged Property
consists of a fee simple estate in real property;  all of the improvements which
are included for the purpose of determining the appraised value of the Mortgaged
Property lie wholly within the boundaries and building restriction lines of such
property and no improvements on adjoining properties encroach upon the Mortgaged
Property (unless insured against under the related title insurance policy);  and
to  the  best  of  the  Seller's  knowledge,  the  Mortgaged  Property  and  all
improvements  thereon comply with all requirements of any applicable  zoning and
subdivision laws and ordinances;

            (ix) The Mortgage Loan meets, or is exempt from, applicable state or
federal laws,  regulations and other requirements,  pertaining to usury, and the
Mortgage Loan is not usurious;

            (x) To the best of the Seller's knowledge, all inspections, licenses
and  certificates  required  to be made or issued with  respect to all  occupied
portions of the Mortgaged Property and, with respect to the use and occupancy of
the same,  including,  but not limited to,  certificates  of occupancy  and fire
underwriting  certificates,  have been  made or  obtained  from the  appropriate
authorities;

            (xi) All payments required to be made up to the Due Date immediately
preceding the Cut-Off Date for such Mortgage Loan under the terms of the related
Mortgage Note have been made and no Mortgage Loan had more than one  delinquency
in the 12 months preceding the Cut-Off Date;

            (xii) The Mortgage Note, the related  Mortgage and other  agreements
executed in connection  therewith are genuine,  and each is the legal, valid and
binding  obligation of the maker  thereof,  enforceable  in accordance  with its
terms,  except as such  enforcement  may be limited by  bankruptcy,  insolvency,
reorganization  or other similar laws  affecting the  enforcement  of creditors'
rights  generally and by general equity  principles  (regardless of whether such
enforcement is considered in a proceeding in equity or at law); and, to the best
of the Seller's knowledge, all parties to the Mortgage Note and the Mortgage had
legal  capacity to execute the Mortgage  Note and the Mortgage and each Mortgage
Note and Mortgage has been duly and properly executed by the Mortgagor;

            (xiii) Any and all  requirements of any federal,  state or local law
with  respect  to the  origination  of the  Mortgage  Loans  including,  without
limitation, truth-in-lending, real estate settlement procedures, consumer credit
protection,  equal credit  opportunity  or  disclosure  laws  applicable  to the
Mortgage Loans have been complied with;

            (xiv) The proceeds of the Mortgage Loans have been fully  disbursed,
there  is no  requirement  for  future  advances  thereunder  and  any  and  all
requirements as to completion of any on-site or off-site  improvements and as to
disbursements  of any escrow funds  therefor have been complied with (except for
escrow funds for exterior  items which could not be completed due to weather and
escrow funds for the  completion  of swimming  pools);  and all costs,  fees and
expenses  incurred in making,  closing or recording  the Mortgage Loan have been
paid,  except  recording  fees with respect to Mortgages  not recorded as of the
Closing Date;

            (xv) The  Mortgage  Loan  (except  any  Mortgage  Loan  secured by a
Mortgaged  Property  located  in any  jurisdiction,  as to which an  opinion  of
counsel of the type customarily  rendered in such  jurisdiction in lieu of title
insurance is instead  received) is covered by an American Land Title Association
mortgagee title insurance policy or other generally acceptable form of policy or
insurance  acceptable to FNMA or FHLMC,  issued by a title insurer acceptable to
FNMA or FHLMC insuring the  originator,  its  successors and assigns,  as to the
first  priority  lien of the  Mortgage in the original  principal  amount of the
Mortgage  Loan and subject only to (A) the lien of current real  property  taxes
and  assessments  not  yet  due  and  payable,  (B)  covenants,  conditions  and
restrictions,  rights of way, easements and other matters of public record as of
the  date  of  recording  of  such  Mortgage   acceptable  to  mortgage  lending
institutions  in the  area  in  which  the  Mortgaged  Property  is  located  or
specifically  referred to in the  appraisal  performed  in  connection  with the
origination  of the related  Mortgage  Loan,  (C) liens created  pursuant to any
federal,  state or local law,  regulation or ordinance  affording  liens for the
costs of clean-up  of  hazardous  substances  or  hazardous  wastes or for other
environmental  protection  purposes  and (D) such  other  matters  to which like
properties are commonly subject which do not individually,  or in the aggregate,
materially  interfere with the benefits of the security  intended to be provided
by the  Mortgage;  the  Seller  is the  sole  insured  of such  mortgagee  title
insurance policy,  the assignment to the Trust  Administrator,  on behalf of the
Trustee,  of the Seller's interest in such mortgagee title insurance policy does
not  require any consent of or  notification  to the insurer  which has not been
obtained or made,  such mortgagee  title  insurance  policy is in full force and
effect  and will be in full  force and  effect  and inure to the  benefit of the
Trust  Administrator,  on behalf of the Trustee,  no claims have been made under
such  mortgagee  title  insurance  policy,  and no prior  holder of the  related
Mortgage,  including the Seller,  has done, by act or omission,  anything  which
would impair the coverage of such mortgagee title insurance policy;

            (xvi) The Mortgaged  Property securing each Mortgage Loan is insured
by an insurer  acceptable to FNMA or FHLMC against loss by fire and such hazards
as are covered  under a standard  extended  coverage  endorsement,  in an amount
which  is not  less  than  the  lesser  of 100% of the  insurable  value  of the
Mortgaged  Property and the outstanding  principal balance of the Mortgage Loan,
but in no event less than the minimum amount  necessary to fully  compensate for
any damage or loss on a replacement  cost basis; if the Mortgaged  Property is a
condominium unit, it is included under the coverage afforded by a blanket policy
for the project;  if upon  origination of the Mortgage Loan, the improvements on
the Mortgaged Property were in an area identified in the Federal Register by the
Federal  Emergency  Management  Agency as having special flood hazards,  a flood
insurance  policy  meeting the  requirements  of the current  guidelines  of the
Federal  Insurance  Administration  is in  effect  with a  generally  acceptable
insurance carrier, in an amount representing coverage not less than the least of
(A) the  outstanding  principal  balance  of the  Mortgage  Loan,  (B) the  full
insurable  value  of the  Mortgaged  Property  and (C)  the  maximum  amount  of
insurance which was available under the National Flood Insurance Act of 1968, as
amended;  and each Mortgage  obligates the Mortgagor  thereunder to maintain all
such insurance at the Mortgagor's cost and expense;

            (xvii) To the best of the Seller's  knowledge,  there is no default,
breach,  violation or event of  acceleration  existing under the Mortgage or the
related  Mortgage  Note and no event  which,  with the  passage  of time or with
notice  and the  expiration  of any grace or cure  period,  would  constitute  a
default, breach,  violation or event of acceleration;  the Seller has not waived
any default,  breach,  violation or event of  acceleration;  and no  foreclosure
action  is  currently  threatened  or has been  commenced  with  respect  to the
Mortgage Loan;

            (xviii)  No  Mortgage  Note or  Mortgage  is subject to any right of
rescission,  set-off,  counterclaim or defense,  including the defense of usury,
nor will the operation of any of the terms of the Mortgage Note or Mortgage,  or
the  exercise  of any right  thereunder,  render the  Mortgage  Note or Mortgage
unenforceable,  in whole or in part,  or subject it to any right of  rescission,
set-off,  counterclaim or defense,  including the defense of usury,  and no such
right of  rescission,  set-off,  counterclaim  or defense has been asserted with
respect thereto;

            (xix) Each Mortgage Note is payable in monthly  payments,  resulting
in complete  amortization  of the Mortgage Loan over a term of not more than 360
months;

            (xx) Each Mortgage  contains  customary and  enforceable  provisions
such as to render the rights and remedies of the holder thereof adequate for the
realization  against the  Mortgaged  Property of the  benefits of the  security,
including realization by judicial foreclosure (subject to any limitation arising
from any  bankruptcy,  insolvency  or other law for the relief of debtors),  and
there is no homestead or other exemption  available to the Mortgagor which would
interfere with such right of foreclosure;

            (xxi) To the  best of the  Seller's  knowledge,  no  Mortgagor  is a
debtor in any state or federal bankruptcy or insolvency proceeding;

            (xxii) Each  Mortgaged  Property is located in the United States and
consists  of a one- to  four-unit  residential  property,  which  may  include a
detached  home,  townhouse,  condominium  unit  or  a  unit  in a  planned  unit
development or, in the case of Mortgage Loans secured by Co-op Shares, leases or
occupancy agreements;

            (xxiii)  The  Mortgage  Loan is a  "qualified  mortgage"  within the
meaning of Section 860G(a)(3) of the Code;

            (xxiv) With respect to each Mortgage where a lost note affidavit has
been delivered to the Trust Administrator in place of the related Mortgage Note,
the related Mortgage Note is no longer in existence;

            (xxv) In the event that the  Mortgagor  is an inter  vivos  "living"
trust,  (i) such trust is in compliance  with FNMA or FHLMC  standards for inter
vivos trusts and (ii) holding title to the Mortgaged Property in such trust will
not diminish any rights as a creditor  including  the right to full title to the
Mortgaged Property in the event foreclosure proceedings are initiated; and

            (xxvi) If the  Mortgage  Loan is secured by a long-term  residential
lease,  (1) the lessor under the lease holds a fee simple  interest in the land;
(2) the terms of such lease  expressly  permit the  mortgaging  of the leasehold
estate,  the  assignment  of the lease  without  the  lessor's  consent  and the
acquisition  by the holder of the  Mortgage  of the  rights of the  lessee  upon
foreclosure  or assignment in lieu of  foreclosure  or provide the holder of the
Mortgage with substantially similar protections;  (3) the terms of such lease do
not (a) allow the  termination  thereof  upon the lessee's  default  without the
holder of the  Mortgage  being  entitled  to  receive  written  notice  of,  and
opportunity to cure, such default, (b) allow the termination of the lease in the
event of damage or  destruction  as long as the  Mortgage is in  existence,  (c)
prohibit the holder of the Mortgage from being insured (or receiving proceeds of
insurance)  under the  hazard  insurance  policy  or  policies  relating  to the
Mortgaged Property or (d) permit any increase in rent other than pre-established
increases  set forth in the lease;  (4) the  original  term of such lease is not
less than 15 years;  (5) the term of such lease does not terminate  earlier than
five years after the maturity date of the Mortgage  Note;  and (6) the Mortgaged
Property is located in a jurisdiction  in which the use of leasehold  estates in
transferring ownership in residential properties is a widely accepted practice.

            Notwithstanding the foregoing,  no representations or warranties are
made by the Seller as to the environmental  condition of any Mortgaged Property;
the absence,  presence or effect of hazardous wastes or hazardous  substances on
any Mortgaged  Property;  any casualty  resulting from the presence or effect of
hazardous  wastes  or  hazardous  substances  on,  near or  emanating  from  any
Mortgaged  Property;  the  impact  on  Certificateholders  of any  environmental
condition  or  presence  of any  hazardous  substance  on or near any  Mortgaged
Property;  or the  compliance of any Mortgaged  Property with any  environmental
laws, nor is any agent,  person or entity  otherwise  affiliated with the Seller
authorized  or able to make any such  representation,  warranty or assumption of
liability relative to any Mortgaged Property. In addition, no representations or
warranties are made by the Seller with respect to the absence or effect of fraud
in the origination of any Mortgage Loan.

            It is understood and agreed that the  representations and warranties
set forth in this Section 2.03(b) shall survive delivery of the respective Owner
Mortgage Loan Files to the Trust Administrator and shall inure to the benefit of
the  Trust  Administrator,  on  behalf  of  the  Trustee,   notwithstanding  any
restrictive or qualified endorsement or assignment.

            (c)   Upon discovery by either the Seller, the Master Servicer,  the
Trust   Administrator,   the   Trustee  or  the   Custodian   that  any  of  the
representations  and  warranties  made in  subsection  (b) above is not accurate
(referred to herein as a "breach") and that such breach materially and adversely
affects the interests of the  Certificateholders  in the related  Mortgage Loan,
the party  discovering such breach shall give prompt written notice to the other
parties (any Custodian being so obligated under a Custodial  Agreement).  Within
60 days of the  earlier of its  discovery  or its  receipt of notice of any such
breach,  the Seller  shall cure such  breach in all  material  respects or shall
either (i)  repurchase  the Mortgage  Loan or any  property  acquired in respect
thereof  from the  Trust  Estate  at a price  equal  to (A)  100% of the  unpaid
principal  balance of such  Mortgage  Loan plus (B) accrued  interest at the Net
Mortgage  Interest Rate for such Mortgage Loan through the last day of the month
in which such  repurchase  took place or (ii) if within two years of the Startup
Day, or such other period permitted by the REMIC Provisions, substitute for such
Mortgage Loan in the manner described in Section 2.02. The purchase price of any
repurchase described in this paragraph and the Substitution Principal Amount, if
any, plus accrued  interest thereon and the other amounts referred to in Section
2.02, shall be deposited in the Certificate Account. It is understood and agreed
that the  obligation of the Seller to repurchase or substitute  for any Mortgage
Loan or property as to which such a breach has occurred and is continuing  shall
constitute   the   sole   remedy    respecting   such   breach    available   to
Certificateholders,  the Trust  Administrator  on behalf of the Trustee,  or the
Trustee on behalf of Certificateholders, and such obligation shall survive until
termination of the Trust Estate hereunder.

            SECTION 2.04      EXECUTION AND DELIVERY OF CERTIFICATES.

            The Trust  Administrator  acknowledges  the  assignment to it of the
Mortgage  Loans and the  delivery of the Owner  Mortgage  Loan Files to it, and,
concurrently with such delivery, has executed and delivered to or upon the order
of the Seller, in exchange for the Mortgage Loans together with all other assets
included  in the  definition  of  "Trust  Estate",  receipt  of which is  hereby
acknowledged,  Certificates in authorized denominations which evidence ownership
of the entire Trust Estate.

            SECTION 2.05      DESIGNATION  OF  CERTIFICATES;  DESIGNATION  OF
STARTUP DAY AND LATEST POSSIBLE MATURITY DATE.

            The Seller  hereby  designates  the Classes of Class A  Certificates
(other than the Class A-R  Certificate)  and the Classes of Class B Certificates
as classes of "regular  interests"  and the Class A-R  Certificate as the single
class of  "residual  interest"  in the REMIC for the  purposes of Code  Sections
860G(a)(1) and 860G(a)(2),  respectively.  The Closing Date is hereby designated
as the "Startup Day" of the REMIC within the meaning of Code Section 860G(a)(9).
The "latest  possible  maturity  date" of the regular  interests in the REMIC is
June 25, 2029 for purposes of Code Section 860G(a)(1).


<PAGE>





                                   ARTICLE III

                       ADMINISTRATION OF THE TRUST ESTATE;

                         SERVICING OF THE MORTGAGE LOANS

            SECTION 3.01      CERTIFICATE ACCOUNT.

            (a)  The Master Servicer shall establish and maintain a Certificate
Account for the deposit of funds received by the Master Servicer with respect to
the Mortgage Loans  serviced by each Servicer  pursuant to each of the Servicing
Agreements.  Such account shall be maintained as an Eligible Account. The Master
Servicer  shall give notice to each  Servicer  and the Seller of the location of
the Certificate Account and of any change in the location thereof.

            (b)  The Master Servicer shall deposit into the Certificate Account
on the day of receipt  thereof  all  amounts  received  by it from any  Servicer
pursuant to any of the Servicing Agreements and shall, in addition, deposit into
the Certificate  Account the following amounts, in the case of amounts specified
in clause (i),  not later than the  Distribution  Date on which such amounts are
required to be distributed to Certificateholders and, in the case of the amounts
specified in clause (ii), not later than the Business Day next following the day
of receipt and posting by the Master Servicer:

            (i) Periodic Advances pursuant to Section 3.03(a) made by the Master
Servicer or the Trust  Administrator,  if any and any amounts deemed received by
the Master Servicer pursuant to Section 3.01(d); and

            (ii) in the case of any  Mortgage  Loan that is  repurchased  by the
Seller  pursuant  to  Section  2.02 or 2.03 or that is  auctioned  by the Master
Servicer  pursuant to Section 3.08 or purchased by the Master Servicer  pursuant
to Section 3.08 or 9.01, the purchase price therefor or, where  applicable,  any
Substitution  Principal  Amount  and any  amounts  received  in  respect  of the
interest portion of unreimbursed Periodic Advances.

            (c)   The  Master  Servicer shall cause the funds in the Certificate
Account to be invested in Eligible  Investments.  No such  Eligible  Investments
will be sold or  disposed  of at a gain  prior to  maturity  unless  the  Master
Servicer has received an Opinion of Counsel or other evidence satisfactory to it
that such sale or  disposition  will not cause the Trust Estate to be subject to
Prohibited Transactions Tax, otherwise subject the Trust Estate to tax, or cause
the Trust  Estate to fail to  qualify  as a REMIC  while  any  Certificates  are
outstanding.  Any amounts  deposited  in the  Certificate  Account  prior to the
Distribution  Date shall be invested for the account of the Master  Servicer and
any  investment  income thereon shall be additional  compensation  to the Master
Servicer for services  rendered under this  Agreement.  The amount of any losses
incurred  in  respect  of  any  such  investments  shall  be  deposited  in  the
Certificate  Account by the Master Servicer out of its own funds  immediately as
realized.

            (d)   For  purposes of this  Agreement,  the Master Servicer will be
deemed to have received from a Servicer on the  applicable  Remittance  Date for
such funds all amounts deposited by such Servicer into the Custodial Account for
P&I maintained in accordance with the applicable  Servicing  Agreement,  if such
Custodial  Account  for  P&I is not an  Eligible  Account  as  defined  in  this
Agreement,  to the extent such amounts are not  actually  received by the Master
Servicer  on such  Remittance  Date as a result of the  bankruptcy,  insolvency,
receivership or other financial distress of the depository  institution in which
such  Custodial  Account  for P&I is being held.  To the extent that  amounts so
deemed to have been received by the Master Servicer are subsequently remitted to
the Master  Servicer,  the Master  Servicer  shall be  entitled  to retain  such
amounts.

            SECTION 3.02      PERMITTED  WITHDRAWALS  FROM  THE  CERTIFICATE
ACCOUNT.

            (a) The Master  Servicer  may, from time to time,  make  withdrawals
from the Certificate Account for the following purposes (limited, in the case of
Servicer  reimbursements,  to cases where funds in the respective  Custodial P&I
Account are not sufficient therefor):

            (i) to reimburse the Master Servicer, the Trust Administrator or any
Servicer  for  Periodic  Advances  made  by the  Master  Servicer  or the  Trust
Administrator  pursuant  to Section  3.03(a)  or any  Servicer  pursuant  to any
Servicing  Agreement with respect to previous  Distribution Dates, such right to
reimbursement  pursuant to this subclause (i) being limited to amounts  received
on or in respect of  particular  Mortgage  Loans  (including,  for this purpose,
Liquidation  Proceeds,  REO  Proceeds  and  proceeds  from the  purchase,  sale,
repurchase or  substitution  of Mortgage Loans pursuant to Sections 2.02,  2.03,
3.08 or 9.01) respecting which any such Periodic Advance was made;

               (ii) to reimburse any Servicer,  the Master Servicer or the Trust
Administrator for any Periodic Advances  determined in good faith to have become
Nonrecoverable  Advances provided,  however,  that any portion of Nonrecoverable
Advances  representing  Fixed  Retained  Yield shall be  reimbursable  only from
amounts constituting Fixed Retained Yield and not from
the assets of the Trust Estate;

               (iii) to  reimburse  the Master  Servicer  or any  Servicer  from
Liquidation  Proceeds for Liquidation  Expenses and for amounts  expended by the
Master Servicer or any Servicer  pursuant hereto or to any Servicing  Agreement,
respectively,  in good  faith in  connection  with the  restoration  of  damaged
property or for foreclosure expenses;

            (iv) from any  Mortgagor  payment on account  of  interest  or other
recovery  (including  Net REO  Proceeds)  with respect to a particular  Mortgage
Loan, to pay the Master  Servicing Fee with respect to such Mortgage Loan to the
Master Servicer;

            (v) to reimburse the Master Servicer, any Servicer or the Trust
Administrator  (or, in certain  cases,  the Seller) for expenses  incurred by it
(including  taxes  paid on behalf of the Trust  Estate)  and  recoverable  by or
reimbursable  to it pursuant to Section  3.03(c),  3.03(d) or 6.03 or the second
sentence of Section 8.14(a) or pursuant to such Servicer's  Servicing Agreement,
provided  such  expenses  are  "unanticipated"  within the  meaning of the REMIC
Provisions;

            (vi) to pay to the Seller or other  purchaser  with  respect to each
Mortgage Loan or property  acquired in respect thereof that has been repurchased
or replaced  pursuant to Section 2.02 or 2.03 or  auctioned  pursuant to Section
3.08 or to pay to the Master  Servicer  with  respect to each  Mortgage  Loan or
property acquired in respect thereof that has been purchased pursuant to Section
3.08 or 9.01, all amounts received thereon and not required to be distributed as
of the date on which the  related  repurchase  or  purchase  price or  Scheduled
Principal Balance was determined;

            (vii) to remit  funds to the Paying  Agent in the amounts and in the
manner provided for herein;

            (viii)  to pay to the  Master  Servicer  any  interest  earned on or
investment income with respect to funds in the Certificate Account;

            (ix)  to  pay  to  the  Master  Servicer  or  any  Servicer  out  of
Liquidation  Proceeds  allocable  to  interest  the amount of any unpaid  Master
Servicing  Fee or Servicing Fee (as adjusted  pursuant to the related  Servicing
Agreement)  and any  unpaid  assumption  fees,  late  payment  charges  or other
Mortgagor charges on the related Mortgage Loan;

            (x) to withdraw from the Certificate Account any amount deposited in
the Certificate Account that was not required to be deposited therein;

            (xi) to clear and  terminate  the  Certificate  Account  pursuant to
Section 9.01; and

            (xii) to pay to  Norwest  Mortgage  from any  Mortgagor  payment  on
account of interest or other recovery  (including Net REO Proceeds) with respect
to a particular Mortgage Loan, the Fixed Retained Yield, if any, with respect to
such  Mortgage  Loan;  provided,  however,  that with  respect to any payment of
interest  received by the Master Servicer in respect of a Mortgage Loan (whether
paid by the Mortgagor or received as Liquidation Proceeds, Insurance Proceeds or
otherwise)  which is less than the full amount of interest then due with respect
to such Mortgage Loan,  only that portion of such payment of interest that bears
the same  relationship  to the total  amount of such  payment of interest as the
Fixed Retained Yield Rate, if any, in respect of such Mortgage Loan bears to the
Mortgage  Interest  Rate shall be  allocated  to the Fixed  Retained  Yield with
respect thereto.

            (b) The Master Servicer shall keep and maintain separate accounting,
on a Mortgage  Loan by Mortgage Loan basis,  for the purpose of  justifying  any
payment to and withdrawal from the Certificate Account.

            SECTION 3.03      ADVANCES   BY   MASTER   SERVICER   AND  TRUST
ADMINISTRATOR.

            (a) In the  event an  Other  Servicer  fails  to make  any  required
Periodic  Advances of principal  and interest on a Mortgage  Loan as required by
the related Other Servicing  Agreement prior to the Distribution  Date occurring
in the month during  which such  Periodic  Advance is due,  the Master  Servicer
shall make Periodic Advances to the extent provided hereby. In the event Norwest
Mortgage fails to make any required  Periodic Advances of principal and interest
on a Mortgage Loan as required by the Norwest  Servicing  Agreement prior to the
Distribution  Date occurring in the month during which such Periodic  Advance is
due, the Trust Administrator shall, to the extent required by Section 8.15, make
such Periodic  Advance to the extent  provided  hereby,  provided that the Trust
Administrator  has previously  received the  certificate of the Master  Servicer
described in the following  sentence.  The Master  Servicer shall certify to the
Trust Administrator with respect to any such Distribution Date (i) the amount of
Periodic  Advances  required of Norwest Mortgage or such Other Servicer,  as the
case may be, (ii) the amount actually advanced by Norwest Mortgage or such Other
Servicer,  (iii) the amount that the Trust  Administrator  or Master Servicer is
required  to  advance  hereunder  and  (iv)  whether  the  Master  Servicer  has
determined  that  it  reasonably  believes  that  such  Periodic  Advance  is  a
Nonrecoverable  Advance.  Amounts advanced by the Trust  Administrator or Master
Servicer  shall  be  deposited  in  the  Certificate   Account  on  the  related
Distribution Date.  Notwithstanding  the foregoing,  neither the Master Servicer
nor the Trust Administrator will be obligated to make a Periodic Advance that it
reasonably believes to be a Nonrecoverable  Advance. The Trust Administrator may
conclusively  rely for any  determination  to be made by it  hereunder  upon the
determination of the Master Servicer as set forth in its certificate.

            (b) To the  extent an Other  Servicer  fails to make an  advance  on
account of the taxes or  insurance  premiums  with  respect  to a Mortgage  Loan
required pursuant to the related Other Servicing Agreement,  the Master Servicer
shall,  if the Master  Servicer  knows of such failure of the Servicer,  advance
such funds and take such steps as are  necessary  to pay such taxes or insurance
premiums.  To the extent Norwest Mortgage fails to make an advance on account of
the taxes or  insurance  premiums  with  respect  to a  Mortgage  Loan  required
pursuant to the Norwest Servicing  Agreement,  the Master Servicer shall, if the
Master Servicer knows of such failure of Norwest Mortgage,  certify to the Trust
Administrator   that  such   failure  has   occurred.   Upon   receipt  of  such
certification,  the Trust  Administrator  shall advance such funds and take such
steps as are necessary to pay such taxes or insurance premiums.

            (c) The Master  Servicer and the Trust  Administrator  shall each be
entitled to be reimbursed from the Certificate  Account for any Periodic Advance
made by it under Section 3.03(a) to the extent  described in Section  3.02(a)(i)
and (a)(ii).  The Master Servicer and the Trust  Administrator shall be entitled
to be reimbursed  pursuant to Section  3.02(a)(v) for any advance by it pursuant
to Section 3.03(b).  The Master Servicer shall diligently pursue  restoration of
such amount to the  Certificate  Account from the related  Servicer.  The Master
Servicer  shall,  to the extent it has not already  done so, upon the request of
the Trust Administrator,  withdraw from the Certificate Account and remit to the
Trust  Administrator any amounts to which the Trust Administrator is entitled as
reimbursement pursuant to Section 3.02 (a)(i), (ii) and (v).

            (d) Except as  provided  in Section  3.03(a)  and (b),  neither  the
Master Servicer nor the Trust  Administrator shall be required to pay or advance
any amount  which any  Servicer  was  required,  but  failed,  to deposit in the
Certificate Account.

            SECTION 3.04      TRUST  ADMINISTRATOR  TO COOPERATE;  RELEASE OF
OWNER MORTGAGE LOAN FILES.

            Upon the receipt by the Master  Servicer of a Request for Release in
connection  with the deposit by a Servicer into the  Certificate  Account of the
proceeds from a Liquidated  Loan or of a Prepayment in Full, the Master Servicer
shall  confirm  to the  Trust  Administrator  that all  amounts  required  to be
remitted to the  Certificate  Account in connection with such Mortgage Loan have
been so  deposited,  and shall  deliver  such  Request  for Release to the Trust
Administrator.  The Trust Administrator  shall, within five Business Days of its
receipt of such a Request for Release,  release the related Owner  Mortgage Loan
File to the  Master  Servicer  or such  Servicer,  as  requested  by the  Master
Servicer. No expenses incurred in connection with any instrument of satisfaction
or deed of reconveyance shall be chargeable to the Certificate Account.

            From  time  to  time  and  as  appropriate   for  the  servicing  or
foreclosure of any Mortgage Loan, including but not limited to, collection under
any insurance policies, or to effect a partial release of any Mortgaged Property
from the lien of the Mortgage,  the Servicer of such Mortgage Loan shall deliver
to the Master Servicer a Request for Release. Upon the Master Servicer's receipt
of any such Request for Release, the Master Servicer shall promptly forward such
request to the Trust  Administrator and the Trust  Administrator  shall,  within
five Business  Days,  release the related Owner Mortgage Loan File to the Master
Servicer or such Servicer, as requested by the Master Servicer. Any such Request
for Release shall obligate the Master Servicer or such Servicer, as the case may
be,  to return  each and  every  document  previously  requested  from the Owner
Mortgage Loan File to the Trust  Administrator by the twenty-first day following
the release  thereof,  unless (i) the Mortgage Loan has been  liquidated and the
Liquidation  Proceeds  relating to the Mortgage Loan have been  deposited in the
Certificate  Account or (ii) the Owner  Mortgage  Loan File or such document has
been delivered to an attorney,  or to a public trustee or other public  official
as required by law, for purposes of initiating or pursuing legal action or other
proceedings for the foreclosure of the Mortgaged  Property either  judicially or
non-judicially, and the Master Servicer has delivered to the Trust Administrator
a certificate of the Master Servicer or such Servicer  certifying as to the name
and  address  of the  Person  to which  such  Owner  Mortgage  Loan File or such
document  was  delivered  and the  purpose or purposes  of such  delivery.  Upon
receipt of an  Officer's  Certificate  of the Master  Servicer or such  Servicer
stating that such Mortgage Loan was liquidated and that all amounts  received or
to be received in  connection  with such  liquidation  which are  required to be
deposited  into the  Certificate  Account have been so  deposited,  or that such
Mortgage Loan has become an REO Mortgage  Loan, the Request for Release shall be
released by the Trust Administrator to the Master Servicer or such Servicer,  as
appropriate.

            Upon written certification of the Master Servicer or the Servicer of
a Mortgage Loan, the Trust Administrator shall execute and deliver to the Master
Servicer or such Servicer, as directed by the Master Servicer,  court pleadings,
requests for trustee's sale or other  documents  necessary to the foreclosure or
trustee's sale in respect of a Mortgaged Property or to any legal action brought
to obtain judgment  against any Mortgagor on the Mortgage Note or Mortgage or to
obtain a  deficiency  judgment,  or to  enforce  any  other  remedies  or rights
provided by the Mortgage  Note or Mortgage or  otherwise  available at law or in
equity.  Each such certification  shall include a request that such pleadings or
documents  be executed  by the Trust  Administrator  and a  statement  as to the
reason such  documents or pleadings  are  required  and that the  execution  and
delivery  thereof by the Trust  Administrator  will not  invalidate or otherwise
affect the lien of the Mortgage,  except for the termination of such a lien upon
completion of the foreclosure proceeding or trustee's sale.

            SECTION 3.05      REPORTS TO THE TRUSTEE AND TRUST ADMINISTRATOR;
ANNUAL COMPLIANCE STATEMENTS.

            (a) Not later than 15 days after each Distribution  Date, the Master
Servicer  shall deliver to the Trustee and the Trust  Administrator  a statement
setting forth the status of the Certificate  Account as of the close of business
on such Distribution Date stating that all distributions  required to be made by
the Master  Servicer  under this  Agreement  have been made (or, if any required
distribution has not been made by the Master Servicer, specifying the nature and
status  thereof)  and showing,  for the period  covered by such  statement,  the
aggregate  amount of deposits  into and  withdrawals  from such account for each
category of deposit and  withdrawal  specified in Sections  3.01 and 3.02.  Such
statement may be in the form of the then current FNMA monthly  accounting report
for its Guaranteed Mortgage  Pass-Through Program with appropriate additions and
changes, and shall also include information as to the aggregate unpaid principal
balance of all of the Mortgage  Loans as of the close of business as of the last
day of the calendar month immediately  preceding such Distribution  Date. Copies
of  such  statement  shall  be  provided  by  the  Trust  Administrator  to  any
Certificateholder upon written request, provided such statement is delivered, or
caused to be delivered, by the Master Servicer to the Trust Administrator.

            (b)   The Master Servicer shall deliver to the Trustee and the Trust
Administrator  on or before  April 30 of each year, a  certificate  signed by an
officer of the Master  Servicer,  certifying  that (i) such officer has reviewed
the  activities of the Master  Servicer  during the  preceding  calendar year or
portion thereof and its performance under this agreement and (ii) to the best of
such  officer's  knowledge,  based  on such  review,  the  Master  Servicer  has
performed and fulfilled its duties,  responsibilities and obligations under this
agreement in all material respects throughout such year, or, if there has been a
default in the fulfillment of any such duties,  responsibilities or obligations,
specifying  each such  default  known to such  officer and the nature and status
thereof,  and, (iii) (A) the Master Servicer has received from each Servicer any
financial statements,  officer's certificates,  accountant's statements or other
information  required  to be  provided  to the Master  Servicer  pursuant to the
related  Servicing  Agreement and (B) to the best of such  officer's  knowledge,
based on a review of the  information  provided  to the Master  Servicer by each
Servicer as  described  in (iii)(A)  above,  each  Servicer  has  performed  and
fulfilled  its  duties,  responsibilities  and  obligations  under  the  related
Servicing  Agreement in all material respects throughout such year, or, if there
has been a default in the  fulfillment of any such duties,  responsibilities  or
obligations,  specifying  each such default known to such officer and the nature
and status thereof.  Copies of such officers'  certificate  shall be provided by
the Trust Administrator to any  Certificateholder  upon written request provided
such certificate is delivered, or caused to be delivered, by the Master Servicer
to the Trust Administrator.

            SECTION 3.06      TITLE,  MANAGEMENT  AND  DISPOSITION OF ANY REO
MORTGAGE LOAN.

            The Master  Servicer  shall  ensure that each REO  Mortgage  Loan is
administered  by the  related  Servicer  at all  times so that it  qualifies  as
"foreclosure  property" under the REMIC Provisions and that it does not earn any
"net income from  foreclosure  property" which is subject to tax under the REMIC
Provisions.  In the  event  that a  Servicer  is unable  to  dispose  of any REO
Mortgage Loan within the period  mandated by each of the  Servicing  Agreements,
the Master Servicer shall monitor such Servicer to verify that such REO Mortgage
Loan is auctioned to the highest  bidder within the period so specified.  In the
event of any such sale of REO Mortgage Loan, the Trust  Administrator  shall, at
the  written  request  of the Master  Servicer  and upon  being  supported  with
appropriate  forms  therefor,  within five  Business  Days of the deposit by the
Master  Servicer of the  proceeds of such sale or auction  into the  Certificate
Account,  release or cause to be released to the entity identified by the Master
Servicer the related Owner  Mortgage  Loan File and Servicer  Mortgage Loan File
and shall execute and deliver such  instruments  of transfer or  assignment,  in
each  case  without  recourse,  as shall  be  necessary  to vest in the  auction
purchaser title to the REO Mortgage Loan and the Trust  Administrator shall have
no  further  responsibility  with  regard to such  Owner  Mortgage  Loan File or
Servicer  Mortgage  Loan  File.  Neither  the Trust  Administrator,  the  Master
Servicer nor any Servicer,  acting on behalf of the Trust Estate,  shall provide
financing from the Trust Estate to any purchaser of an REO Mortgage Loan.

            SECTION 3.07      AMENDMENTS    TO    SERVICING    AGREEMENTS,
MODIFICATION OF STANDARD PROVISIONS.

            (a)  Subject  to the prior  written  consent of the Trustee and the
Trust Administrator  pursuant to Section 3.07(b),  the Master Servicer from time
to time may, to the extent permitted by the applicable Servicing Agreement, make
such  modifications  and  amendments to such  Servicing  Agreement as the Master
Servicer  deems  necessary or appropriate to confirm or carry out more fully the
intent and purpose of such Servicing Agreement and the duties,  responsibilities
and obligations to be performed by the Servicer  thereunder.  Such modifications
may only be made if they are consistent with the REMIC Provisions,  as evidenced
by an  Opinion  of  Counsel.  Prior  to  the  issuance  of any  modification  or
amendment,  the  Master  Servicer  shall  deliver to the  Trustee  and the Trust
Administrator such Opinion of Counsel and an Officer's Certificate setting forth
(i) the provision that is to be modified or amended,  (ii) the  modification  or
amendment  that the  Master  Servicer  desires  to issue and (iii) the reason or
reasons for such proposed amendment or modification.

            (b)  The Trustee and the Trust  Administrator  shall  consent to any
amendment or supplement to a Servicing Agreement proposed by the Master Servicer
pursuant to Section  3.07(a),  which consent and amendment shall not require the
consent  of any  Certificateholder  if it is (i) for the  purpose  of curing any
mistake  or  ambiguity  or to  further  effect  or  protect  the  rights  of the
Certificateholders  or (ii) for any other  purpose,  provided such  amendment or
supplement  for such other  purpose  cannot  reasonably be expected to adversely
affect  Certificateholders.  The lack of  reasonable  expectation  of an adverse
effect on  Certificateholders  may be  established  through the  delivery to the
Trustee and the Trust  Administrator of (i) an Opinion of Counsel to such effect
or (ii)  written  notification  from each Rating  Agency to the effect that such
amendment  or  supplement  will not result in  reduction  of the current  rating
assigned  by that Rating  Agency to the  Certificates.  Notwithstanding  the two
immediately  preceding sentences,  either the Trustee or the Trust Administrator
may, in its discretion,  decline to enter into or consent to any such supplement
or  amendment  if its own  rights,  duties  or  immunities  shall  be  adversely
affected.

            (c)  (i)  Notwithstanding  anything to the contrary in this Section
3.07,  the Master  Servicer  from time to time may,  without  the consent of any
Certificateholder,  the  Trustee,  or the  Trust  Administrator,  enter  into an
amendment (A) to an Other Servicing Agreement for the purpose of (i) eliminating
or reducing  Month End Interest and (ii)  providing  for the  remittance of Full
Unscheduled Principal Receipts by the applicable Servicer to the Master Servicer
not later than the 24th day of each month (or if such day is not a Business Day,
on the previous Business Day) or (B) to the Norwest Servicing  Agreement for the
purpose of changing the applicable Remittance Date to the 18th day of each month
(or if such day is not a Business Day, on the previous Business Day).

            (ii)  The Master Servicer may direct Norwest  Mortgage to enter into
an amendment to the Norwest  Servicing  Agreement for the purposes  described in
Sections 3.07(c)(i)(B) and 10.01(b)(iii).

            SECTION 3.08      OVERSIGHT OF SERVICING.

            The  Master  Servicer  shall  supervise,  monitor  and  oversee  the
servicing of the Mortgage  Loans by each  Servicer and the  performance  by each
Servicer of all services,  duties,  responsibilities and obligations  (including
the  obligation  to maintain an Errors and Omissions  Policy and Fidelity  Bond)
that are to be  observed  or  performed  by the  Servicer  under its  respective
Servicing  Agreement.  In  performing  its  obligations  hereunder,  the  Master
Servicer  shall  act in a  manner  consistent  with  Accepted  Master  Servicing
Practices  and  with  the  Trustee's  and  the  Trust  Administrator's  and  the
Certificateholders'  reliance on the Master Servicer, and in a manner consistent
with the terms and provisions of any insurance  policy required to be maintained
by the  Master  Servicer  or any  Servicer  pursuant  to this  Agreement  or any
Servicing  Agreement.  The  Master  Servicer  acknowledges  that prior to taking
certain actions required to service the Mortgage Loans, each Servicing Agreement
provides that the Servicer  thereunder  must notify,  consult  with,  obtain the
consent of or otherwise  follow the  instructions  of the Master  Servicer.  The
Master Servicer is also given  authority to waive  compliance by a Servicer with
certain provisions of its Servicing Agreement. In each such instance, the Master
Servicer  shall  promptly  instruct such  Servicer or otherwise  respond to such
Servicer's  request. In no event will the Master Servicer instruct such Servicer
to take any  action,  give any  consent  to  action  by such  Servicer  or waive
compliance  by such Servicer  with any  provision of such  Servicer's  Servicing
Agreement if any resulting  action or failure to act would be inconsistent  with
the  requirements  of the Rating  Agencies that rated the  Certificates or would
otherwise have an adverse effect on the  Certificateholders.  Any such action or
failure   to  act   shall  be  deemed   to  have  an   adverse   effect  on  the
Certificateholders  if such  action or failure to act either  results in (i) the
downgrading  of the rating  assigned by any Rating  Agency to the  Certificates,
(ii) the loss by the  Trust  Estate  of REMIC  status  for  federal  income  tax
purposes  or (iii)  the  imposition  of any  Prohibited  Transaction  Tax or any
federal taxes on the REMIC or the Trust Estate.  The Master  Servicer shall have
full power and authority in its sole  discretion to take any action with respect
to the Trust Estate as may be necessary or advisable to avoid the  circumstances
specified including clause (ii) or (iii) of the preceding sentence.

            For the  purposes  of  determining  whether  any  modification  of a
Mortgage  Loan  shall be  permitted  by the Trust  Administrator  or the  Master
Servicer, such modification shall be construed as a substitution of the modified
Mortgage Loan for the Mortgage Loan originally  deposited in the Trust Estate if
it  would  be  a  "significant  modification"  within  the  meaning  of  Section
1.860G-2(b)  of the  regulations  of the U.S.  Department  of the  Treasury.  No
modification  shall be  approved  unless (i) the  modified  Mortgage  Loan would
qualify as a Substitute  Mortgage  Loan under Section 2.02 and (ii) with respect
to any  modification  that occurs more than three  months after the Closing Date
and is not the result of a default or a reasonably foreseeable default under the
Mortgage  Loan,  there is  delivered  to the Trust  Administrator  an Opinion of
Counsel (at the expense of the party seeking to modify the Mortgage Loan) to the
effect that such modification  would not be treated as giving rise to a new debt
instrument  for  federal  income tax  purposes  as  described  in the  preceding
sentence.

            During the term of this Agreement, the Master Servicer shall consult
fully with each  Servicer as may be  necessary  from time to time to perform and
carry out the Master  Servicer's  obligations  hereunder and otherwise  exercise
reasonable  efforts to  encourage  such  Servicer  to perform  and  observe  the
covenants,  obligations  and  conditions to be performed or observed by it under
its Servicing Agreement.

            The relationship of the Master Servicer to the Trustee and the Trust
Administrator  under this  Agreement is intended by the parties to be that of an
independent contractor and not that of a joint venturer, partner or agent.

            The Master  Servicer shall  administer the Trust Estate on behalf of
the Trustee and shall have full power and authority, acting alone or (subject to
Section  6.06) through one or more  subcontractors,  to do any and all things in
connection  with such  administration  which it may deem necessary or desirable.
Upon the execution and delivery of this Agreement,  and from time to time as may
be required  thereafter,  the Trust Administrator on behalf of the Trustee shall
furnish the Master  Servicer or its  subcontractors  with any powers of attorney
and such other documents as may be necessary or appropriate to enable the Master
Servicer to carry out its administrative duties hereunder.

            The Seller  shall be  entitled to  repurchase  at its option (i) any
defaulted  Mortgage  Loan or any Mortgage Loan as to which default is reasonably
foreseeable from the Trust Estate if, in the Seller's  judgment,  the default is
not likely to be cured by the  Mortgagor or (ii) any Mortgage  Loan in the Trust
Estate  which,  pursuant  to  paragraph  5(b)  of  the  Mortgage  Loan  Purchase
Agreement,  Norwest  Mortgage  requests the Seller to repurchase  and to sell to
Norwest Mortgage to facilitate the exercise of Norwest Mortgage's rights against
the  originator or a prior holder of such Mortgage  Loan. The purchase price for
any such  Mortgage  Loan shall be 100% of the unpaid  principal  balance of such
Mortgage Loan plus accrued  interest  thereon at the Mortgage  Interest Rate for
such Mortgage Loan,  through the last day of the month in which such  repurchase
occurs.  Upon the receipt of such  purchase  price,  the Master  Servicer  shall
provide to the Trust  Administrator the  certification  required by Section 3.04
and the Trust Administrator and the Custodian, if any, shall promptly release to
the Seller the Owner  Mortgage  Loan File  relating to the  Mortgage  Loan being
repurchased.

            In the event that (i) the  Master  Servicer  determines  at any time
that,  notwithstanding  the  representations and warranties set forth in Section
2.03(b),  any Mortgage Loan is not a "qualified  mortgage" within the meaning of
Section  860G of the Code and (ii) the Master  Servicer is unable to enforce the
obligation of the Seller to purchase such Mortgage Loan pursuant to Section 2.02
within two months of such  determination,  the Master  Servicer shall cause such
Mortgage  Loan to be auctioned  to the highest  bidder and sold out of the Trust
Estate no later than the date 90 days after such determination.  In the event of
any such sale of a Mortgage Loan, the Trust Administrator  shall, at the written
request of the Master Servicer and upon being supported with  appropriate  forms
therefor, within five Business Days of the deposit by the Master Servicer of the
proceeds of such auction into the  Certificate  Account,  release or cause to be
released to the entity  identified  by the Master  Servicer  the  related  Owner
Mortgage Loan File and Servicer Mortgage Loan File and shall execute and deliver
such instruments of transfer or assignment,  in each case without  recourse,  as
shall be necessary to vest in the auction  purchaser  title to the Mortgage Loan
and the Trust Administrator shall have no further  responsibility with regard to
such Owner Mortgage Loan File or Servicer Mortgage Loan File.  Neither the Trust
Administrator,  the Master  Servicer nor any  Servicer,  acting on behalf of the
Trust  Administrator,  shall  provide  financing  from the  Trust  Estate to any
purchaser of a Mortgage Loan.

            The Master Servicer,  on behalf of the Trust  Administrator,  shall,
pursuant to the Servicing  Agreements,  object to the foreclosure upon, or other
related  conversion of the  ownership of, any Mortgaged  Property by the related
Servicer if (i) the Master  Servicer  believes  such  Mortgaged  Property may be
contaminated  with or affected by hazardous  wastes or hazardous  substances  or
(ii) such Servicer does not agree to administer  such Mortgaged  Property,  once
the related  Mortgage Loan becomes an REO Mortgage Loan, in a manner which would
not result in a federal tax being imposed upon the Trust Estate or the REMIC.

            The Master  Servicer  may enter into a special  servicing  agreement
with an unaffiliated  holder of 100%  Percentage  Interest of a Class of Class B
Certificates or a holder of a class of securities  representing interests in the
Class  B   Certificates   and/or  other   subordinated   mortgage   pass-through
certificates, such agreement to be substantially in the form of Exhibit M hereto
or  subject  to each  Rating  Agency's  acknowledgment  that the  ratings of the
Certificates in effect  immediately prior to the entering into of such agreement
would not be qualified,  downgraded or withdrawn and the Certificates  would not
be placed on credit review status (except for possible upgrading)  (without,  in
the case of the Class A-3  Certificates,  giving effect to the guaranty provided
by  Ambac)  as a result  of such  agreement.  Any  such  agreement  may  contain
provisions  whereby such holder may  instruct the Master  Servicer to instruct a
Servicer  to the  extent  provided  in the  applicable  Servicing  Agreement  to
commence or delay  foreclosure  proceedings with respect to delinquent  Mortgage
Loans and will  contain  provisions  for the  deposit of cash by the holder that
would  be  available  for  distribution  to  Certificateholders  if  Liquidation
Proceeds are less than they  otherwise  may have been had the Servicer  acted in
accordance with its normal procedures.

            SECTION 3.09      TERMINATION  AND   SUBSTITUTION  OF  SERVICING
AGREEMENTS.

            Upon  the  occurrence  of any  event  for  which a  Servicer  may be
terminated  pursuant  to its  Servicing  Agreement,  the Master  Servicer  shall
promptly  deliver  to the  Seller  and  the  Trustee  an  Officer's  Certificate
certifying  that an event has  occurred  which may justify  termination  of such
Servicing  Agreement,  describing the  circumstances  surrounding such event and
recommending  what action  should be taken by the Trustee  with  respect to such
Servicer.  If the Master Servicer  recommends  that such Servicing  Agreement be
terminated,  the Master Servicer's  certification  must state that the breach is
material  and not merely  technical  in nature.  Upon  written  direction of the
Master  Servicer,  based upon such  certification,  the Trustee  shall  promptly
terminate such Servicing Agreement.  Notwithstanding the foregoing, in the event
that (i) Norwest  Mortgage fails to make any advance,  as a consequence of which
the Trust Administrator is obligated to make an advance pursuant to Section 3.03
and (ii) the Trust Administrator provides Norwest Mortgage written notice of the
failure to make such advance and such failure shall  continue  unremedied  for a
period of 15 days after receipt of such notice,  the Trust  Administrator  shall
recommend  to the Trustee the  termination  of the Norwest  Servicing  Agreement
without the recommendation of the Master Servicer and upon such  recommendation,
the Trustee shall terminate the Norwest Servicing Agreement. The Master Servicer
shall indemnify the Trustee and the Trust  Administrator  and hold each harmless
from and against any and all claims, liabilities, costs and expenses (including,
without  limitation,  reasonable  attorneys'  fees)  arising out of, or assessed
against the Trustee or the Trust Administrator in connection with termination of
such Servicing  Agreement at the direction of the Master Servicer.  In addition,
the Master  Servicer  shall  indemnify the Trustee and hold it harmless from and
against any and all claims, liabilities,  costs and expenses (including, without
limitation,  reasonable attorney's fees) arising out of, or assessed against the
Trustee in connection with the termination of the Norwest Servicing Agreement as
provided  in the second  preceding  sentence.  If the  Trustee  terminates  such
Servicing Agreement, the Trustee may enter into a substitute Servicing Agreement
with the Master Servicer or, at the Master Servicer's  nomination,  with another
mortgage   loan  service   company   acceptable   to  the  Trustee,   the  Trust
Administrator, the Master Servicer and each Rating Agency under which the Master
Servicer or such substitute servicer, as the case may be, shall assume, satisfy,
perform and carry out all liabilities,  duties, responsibilities and obligations
that are to be, or otherwise were to have been, satisfied, performed and carried
out by such Servicer under such terminated Servicing Agreement.  Until such time
as the Trustee enters into a substitute  servicing agreement with respect to the
Mortgage Loans previously  serviced by such Servicer,  the Master Servicer shall
assume,  satisfy,  perform and carry out all obligations which otherwise were to
have been  satisfied,  performed  and  carried  out by such  Servicer  under its
terminated Servicing  Agreement.  However, in no event shall the Master Servicer
be deemed to have assumed the  obligations of a Servicer to advance  payments of
principal  and  interest on a delinquent  Mortgage  Loan in excess of the Master
Servicer's  independent  Periodic Advance  obligation under Section 3.03 of this
Agreement.  As compensation for the Master Servicer of any servicing obligations
fulfilled  or assumed  by the Master  Servicer,  the  Master  Servicer  shall be
entitled  to any  servicing  compensation  to which a  Servicer  would have been
entitled if the Servicing Agreement with such Servicer had not been terminated.

            SECTION 3.10      APPLICATION OF NET LIQUIDATION PROCEEDS.

            For all purposes  under this  agreement,  Net  Liquidation  Proceeds
received from a Servicer shall be allocated first to accrued and unpaid interest
on the related Mortgage Loan and then to the unpaid principal balance thereof.

            SECTION 3.11      1934 ACT REPORTS.

            The Master Servicer shall, on behalf of the Seller, make all filings
required  to be made by the  Seller  with  respect  to the Class A  Certificates
(other than the Class A-PO  Certificates) and the Class B-1, Class B-2 and Class
B-3 Certificates pursuant to the Securities Exchange Act of 1934, as amended.


<PAGE>






                                   ARTICLE IV

                  DISTRIBUTIONS IN RESPECT OF CERTIFICATES;
                         PAYMENTS TO CERTIFICATEHOLDERS;
                             STATEMENTS AND REPORTS

            SECTION 4.01      DISTRIBUTIONS.

            (a) On each Distribution Date, the Pool Distribution  Amount will be
applied in the following amounts,  to the extent the Pool Distribution Amount is
sufficient therefor, in the manner and in the order of priority as follows:

            first,  to the  Classes of Class A  Certificates  and to Ambac,  pro
      rata, based upon their respective Interest Accrual Amounts and the Premium
      Payment, respectively, in an aggregate amount up to the sum of the Class A
      Interest  Accrual  Amount and the  Premium  Payment  with  respect to such
      Distribution Date;

            second,  to the Classes of Class A  Certificates  and to Ambac,  pro
      rata, based upon their  respective Class A Unpaid Interest  Shortfalls and
      Premium Unpaid Shortfall,  respectively,  in an aggregate amount up to the
      sum of the Aggregate Class A Unpaid Interest  Shortfall and Premium Unpaid
      Shortfall;

            third,  concurrently,  to the Class A  Certificates  (other than the
      Class A-PO Certificates) and the Class A-PO Certificates,  pro rata, based
      on their respective Class A Non-PO Optimal Principal Amount and Class A-PO
      Optimal  Principal  Amount,  (A) to the  Classes  of Class A  Certificates
      (other than the Class A-PO Certificates), in an aggregate amount up to the
      Class A Non-PO Optimal Principal Amount, such distribution to be allocated
      among such Classes in accordance with Section 4.01(b) or Section  4.01(c),
      as applicable,  and (B) to the Class A-PO  Certificates in an amount up to
      the Class A-PO Optimal Principal Amount;

            fourth,  to the Class A-PO Certificates in an amount up to the Class
      A-PO Deferred Amount from amounts otherwise  distributable (without regard
      to this Paragraph fourth) first to the Class B-6 Certificates  pursuant to
      Paragraph  twenty-second,  below,  second to the  Class  B-5  Certificates
      pursuant  to  Paragraph   nineteenth,   below,  third  to  the  Class  B-4
      Certificates  pursuant to Paragraph sixteenth,  below, fourth to the Class
      B-3 Certificates  pursuant to Paragraph  thirteenth,  below,  fifth to the
      Class B-2 Certificates pursuant to Paragraph tenth below, and sixth to the
      Class B-1 Certificates pursuant to Paragraph seventh below;

            fifth, to the Class B-1 Certificates in an amount up to the Interest
      Accrual  Amount  for the  Class  B-1  Certificates  with  respect  to such
      Distribution Date;

            sixth,  to  the  Class B-1  Certificates  in an  amount  up to the
      Class B-1 Unpaid Interest Shortfall;

            seventh,  to the Class B-1 Certificates in an amount up to the Class
      B-1  Optimal  Principal  Amount;   provided,   however,  that  the  amount
      distributable  to the Class B-1  Certificates  pursuant to this  Paragraph
      seventh  will be  reduced  by the  amount,  if any,  that  would have been
      distributable  to the Class  B-1  Certificates  hereunder  used to pay the
      Class A-PO Deferred Amount as provided in Paragraph fourth above;

            eighth,  to  the  Class  B-2  Certificates  in an  amount  up to the
      Interest  Accrual  Amount for the Class B-2  Certificates  with respect to
      such Distribution Date;

            ninth,  to  the  Class B-2  Certificates  in an  amount  up to the
      Class B-2 Unpaid Interest Shortfall;

            tenth,  to the Class B-2  Certificates  in an amount up to the Class
      B-2  Optimal  Principal  Amount;   provided,   however,  that  the  amount
      distributable  to the Class B-2  Certificates  pursuant to this  Paragraph
      tenth  will be  reduced  by the  amount,  if any,  that  would  have  been
      distributable  to the Class  B-2  Certificates  hereunder  used to pay the
      Class A-PO Deferred Amount as provided in Paragraph fourth above;

            eleventh,  to the  Class  B-3  Certificates  in an  amount up to the
      Interest  Accrual  Amount for the Class B-3  Certificates  with respect to
      such Distribution Date;

            twelfth,  to the  Class B-3  Certificates  in an  amount up to the
      Class B-3 Unpaid Interest Shortfall;

            thirteenth,  to the  Class B-3  Certificates  in an amount up to the
      Class B-3 Optimal Principal  Amount;  provided,  however,  that the amount
      distributable  to the Class B-3  Certificates  pursuant to this  Paragraph
      thirteenth  will be reduced by the  amount,  if any,  that would have been
      distributable  to the Class  B-3  Certificates  hereunder  used to pay the
      Class A-PO Deferred Amount as provided in Paragraph fourth above;

            fourteenth,  to the  Class B-4  Certificates  in an amount up to the
      Interest  Accrual  Amount for the Class B-4  Certificates  with respect to
      such Distribution Date;

            fifteenth,  to the Class B-4  Certificates  in an amount up to the
      Class B-4 Unpaid Interest Shortfall;

            sixteenth,  to the  Class  B-4  Certificates  in an amount up to the
      Class B-4 Optimal Principal  Amount;  provided,  however,  that the amount
      distributable  to the Class B-4  Certificates  pursuant to this  Paragraph
      sixteenth  will be reduced  by the  amount,  if any,  that would have been
      distributable  to the Class  B-4  Certificates  hereunder  used to pay the
      Class A-PO Deferred Amount as provided in Paragraph fourth above;

            seventeenth,  to the Class B-5  Certificates  in an amount up to the
      Interest  Accrual  Amount for the Class B-5  Certificates  with respect to
      such Distribution Date;

            eighteenth,  to the Class B-5  Certificates in an amount up to the
      Class B-5 Unpaid Interest Shortfall;

            nineteenth,  to the  Class B-5  Certificates  in an amount up to the
      Class B-5 Optimal Principal  Amount;  provided,  however,  that the amount
      distributable  to the Class B-5  Certificates  pursuant to this  Paragraph
      nineteenth  will be reduced by the  amount,  if any,  that would have been
      distributable  to the Class  B-5  Certificates  hereunder  used to pay the
      Class A-PO Deferred Amount as provided in Paragraph fourth above;

            twentieth,  to the  Class  B-6  Certificates  in an amount up to the
      Interest  Accrual  Amount for the Class B-6  Certificates  with respect to
      such Distribution Date;

            twenty-first,  to the  Class B-6  Certificates  in an amount up to
      the Class B-6 Unpaid Interest Shortfall;

            twenty-second,  to the Class B-6 Certificates in an amount up to the
      Class B-6 Optimal Principal  Amount;  provided,  however,  that the amount
      distributable  to the Class B-6  Certificates  pursuant to this  Paragraph
      twenty-second  will be reduced by the amount, if any, that would have been
      distributable  to the Class  B-6  Certificates  hereunder  used to pay the
      Class A-PO Deferred Amount as provided in Paragraph fourth above; and

            twenty-third, to the Holder of the Class A-R Certificate.

            Notwithstanding  the foregoing,  after the Principal  Balance of any
Class  (other than the Class A-R  Certificate)  has been  reduced to zero,  such
Class will be  entitled to no further  distributions  of  principal  or interest
(including,  without limitation,  any Unpaid Interest Shortfalls).  In addition,
Ambac will not be entitled to its Premium Payments and Premium Unpaid Shortfalls
after the Principal  Balance of the Class A-3  Certificates  has been reduced to
zero.

            Furthermore,  Net Foreclosure  Profits, if any, with respect to such
Distribution  Date minus any portion thereof  payable to a Servicer  pursuant to
Section  3.02(ix)  hereof  shall be  distributed  to the Holder of the Class A-R
Certificate.

            With respect to any  Distribution  Date, the amount of the Principal
Adjustment,  if any,  attributable to any Class of Class B Certificates  will be
allocated  to the  Classes of Class A  Certificates  (other  than the Class A-PO
Certificates)  and any  Class of  Class B  Certificates  with a lower  numerical
designation pro rata based on their outstanding Principal Balances.

            (b) On each  Distribution  Date  occurring  prior to the  Cross-Over
Date, the Class A Non-PO Principal  Distribution  Amount will be allocated among
and distributed in reduction of the Principal Balances of the Classes of Class A
Certificates  (other than the Principal Balance of the Class A-PO  Certificates)
in accordance with the following priorities:

            first, to the Class A-R  Certificate,  until the Principal Balance
      thereof has been reduced to zero;

            second, on each Distribution Date on and after the Distribution Date
      in June 2002,  concurrently,  to the Class A-3 and Class A-4 Certificates,
      pro rata, based on their respective initial Principal Balances,  an amount
      up to  $15,700,  until the  Principal  Balance of each such Class has been
      reduced to zero;

            third,  concurrently,  85% to the Class A-1 and 15% to the Class A-2
      Certificates, an amount up to $496,000.00,  until the Principal Balance of
      either such Class has been reduced to zero;

            fourth,  to  the  Class A-2  Certificates,   until  the  Principal
      Balance thereof has been reduced to zero;

            fifth, concurrently,  until either (x) the Class A-1 Certificates or
      (y) the Class A-3 and Class A-4 Certificates have been reduced to zero:

            (i)   70% to the Class A-1 Certificates; and

            (ii) 30%, concurrently, to the Class A-3 and Class A-4 Certificates,
      pro rata, based on their respective initial Principal Balances;

            sixth, to the Class A-1 Certificates,  until the Principal Balance
      thereof has been reduced to zero; and

            seventh,  concurrently, to the Class A-3 and Class A-4 Certificates,
      pro rata, based on their respective initial Principal Balances,  until the
      Principal Balance of each such Class has been reduced to zero.

            (c)  Notwithstanding  the  foregoing,   on  each  Distribution  Date
occurring on or subsequent to the Cross-Over  Date, the Class A Non-PO Principal
Distribution   Amount  shall  be  distributed  among  the  Classes  of  Class  A
Certificates  (other than the Class A-PO  Certificates)  pro rata in  accordance
with  their  outstanding   Principal  Balances  without  regard  to  either  the
proportions or the priorities set forth in Section 4.01(b).

            (d) (i) For purposes of  determining  whether the Classes of Class B
Certificates are eligible to receive  distributions of principal with respect to
any Distribution Date, the following tests shall apply:

            (A) if the Current  Class B-1  Fractional  Interest is less than the
      Original Class B-1 Fractional Interest and the Class B-1 Principal Balance
      is greater than zero,  the Class B-2,  Class B-3, Class B-4, Class B-5 and
      Class B-6 Certificates  shall not be eligible to receive  distributions of
      principal; or

            (B) if the Current  Class B-2  Fractional  Interest is less than the
      Original Class B-2 Fractional Interest and the Class B-2 Principal Balance
      is greater than zero,  the Class B-3,  Class B-4,  Class B-5 and Class B-6
      Certificates shall not be eligible to receive  distributions of principal;
      or

            (C) if the Current  Class B-3  Fractional  Interest is less than the
      Original Class B-3 Fractional Interest and the Class B-3 Principal Balance
      is greater than zero, the Class B-4, Class B-5 and Class B-6  Certificates
      shall not be eligible to receive distributions of principal; or

            (D) if the Current  Class B-4  Fractional  Interest is less than the
      Original Class B-4 Fractional Interest and the Class B-4 Principal Balance
      is greater than zero, the Class B-5 and Class B-6  Certificates  shall not
      be eligible to receive distributions of principal; or

            (E) if the Current  Class B-5  Fractional  Interest is less than the
      Original Class B-5 Fractional Interest and the Class B-5 Principal Balance
      is greater than zero, the Class B-6 Certificates shall not be eligible to
      receive distributions of principal.

            (ii)  Notwithstanding the foregoing, if on any Distribution Date the
aggregate  distributions  to  Holders  of the  Classes  of Class B  Certificates
entitled  to receive  distributions  of  principal  would  reduce the  Principal
Balances   of  the  Classes  of  Class  B   Certificates   entitled  to  receive
distributions of principal below zero,  first the Class B Prepayment  Percentage
of any  affected  Class  of Class B  Certificates  for  such  Distribution  Date
beginning with the affected Class with the lowest  numerical  Class  designation
and then,  if  necessary,  the Class B  Percentage  of such Class of the Class B
Certificates  for such  Distribution  Date shall be  reduced  to the  respective
percentages  necessary to bring the  Principal  Balance of such Class of Class B
Certificates  to  zero.  The  Class B  Prepayment  Percentages  and the  Class B
Percentages of the remaining  Classes of Class B Certificates will be recomputed
substituting  for  the  Subordinated   Prepayment  Percentage  and  Subordinated
Percentage in such  computations  the  difference  between (A) the  Subordinated
Prepayment  Percentage or Subordinated  Percentage,  as the case may be, and (B)
the percentages  determined in accordance with the preceding  sentence necessary
to bring the Principal  Balances of the affected Classes of Class B Certificates
to zero; provided, however, that if the Principal Balances of all the Classes of
Class B Certificates  eligible to receive  distributions  of principal  shall be
reduced to zero on such Distribution Date, the Class B Prepayment Percentage and
the Class B  Percentage  of the Class of Class B  Certificates  with the  lowest
numerical  Class  designation  which would  otherwise be  ineligible  to receive
distributions  of principal  in  accordance  with this  Section  shall equal the
remainder of the Subordinated  Prepayment  Percentage for such Distribution Date
minus the sum of the Class B  Prepayment  Percentages  of the Classes of Class B
Certificates  having  lower  numerical  Class  designations,  if  any,  and  the
remainder of the Subordinated  Percentage for such  Distribution  Date minus the
sum of the Class B  Percentages  of the Classes of Class B  Certificates  having
lower numerical Class designations, if any, respectively. Any entitlement of any
Class of Class B  Certificates  to principal  payments  solely  pursuant to this
clause  (ii) shall not cause  such Class to be  regarded  as being  eligible  to
receive  principal  distributions  for the purpose of applying the definition of
its Class B Percentage or Class B Prepayment Percentage.

            (e) On each Distribution Date other than the Final Distribution Date
(if such Final  Distribution Date is in connection with a purchase of the assets
of the Trust  Estate by the Seller),  the Paying  Agent shall,  on behalf of the
Master Servicer, from funds remitted to it by the Master Servicer, distribute to
each  Certificateholder  of record on the  preceding  Record Date (other than as
provided in Section 9.01 respecting the final distribution to Certificateholders
or  in  the  last  paragraph  of  this  Section  4.01(e)  respecting  the  final
distribution  in respect of any Class) either in immediately  available funds by
wire transfer to the account of such Certificateholder at a bank or other entity
having  appropriate  facilities  therefor,  if  such   Certificateholder   holds
Certificates  having a Denomination  at least equal to that specified in Section
11.23,  and has so notified the Master  Servicer or, if  applicable,  the Paying
Agent at least seven  Business Days prior to the  Distribution  Date or, if such
Holder holds Certificates having, in the aggregate, a Denomination less than the
requisite minimum Denomination or if such Holder holds the Class A-R Certificate
or has not so notified the Paying  Agent,  by check mailed to such Holder at the
address of such Holder  appearing in the  Certificate  Register,  such  Holder's
share of the Class A  Distribution  Amount with respect to each Class of Class A
Certificates   (other  than  the  Class  A-3   Certificates)  and  the  Class  B
Distribution Amount with respect to each such Class of Class B Certificates and,
in the case of the Class A-3 Certificates, as provided in Section 4.07.

            In the  event  that,  on any  Distribution  Date  prior to the Final
Distribution  Date,  the Principal  Balance of any Class of Class A Certificates
(other than the Class A-R Certificate) or the Principal  Balance of any Class of
Class B Certificates  would be reduced to zero, the Master  Servicer  shall,  as
soon as practicable after the  Determination  Date relating to such Distribution
Date, send a notice to the Trust  Administrator.  The Trust  Administrator  will
then send a notice to each  Certificateholder  of such  Class with a copy to the
Certificate  Registrar,  specifying that the final  distribution with respect to
such Class will be made on such Distribution Date only upon the presentation and
surrender of such  Certificateholder's  Certificates  at the office or agency of
the Trust Administrator therein specified;  provided,  however, that the failure
to give such notice will not entitle a Certificateholder  to any interest beyond
the interest payable with respect to such  Distribution  Date in accordance with
Section 4.01(a).

            (f) The  Paying  Agent (or if no Paying  Agent is  appointed  by the
Master  Servicer,  the Master  Servicer)  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
Persons other than U.S. Persons ("Non-U.S.  Persons"). Amounts withheld pursuant
to this  Section  4.01(f)  shall be treated as having  been  distributed  to the
related  Certificateholder for all purposes of this Agreement.  For the purposes
of this  paragraph,  a "U.S.  Person"  is a citizen  or  resident  of the United
States,  a corporation  or  partnership  (unless,  in the case of a partnership,
Treasury regulations are adopted that provide otherwise) created or organized in
or under the laws of the United  States,  any state  thereof or the  District of
Columbia,  including  an entity  treated as a  corporation  or  partnership  for
federal income tax purposes,  an estate whose income is subject to United States
federal  income tax  regardless of its source,  or a trust if a court within the
United States is able to exercise primary supervision over the administration of
such trust,  and one or more such U.S. Persons have the authority to control all
substantial  decisions of such trust (or, to the extent  provided in  applicable
Treasury  regulations,  certain trusts in existence on August 20, 1996 which are
eligible to be treated as U.S. Persons).

            SECTION 4.02      ALLOCATION OF REALIZED LOSSES.

            (a) With respect to any Distribution  Date, the principal portion of
Realized  Losses  (other than Debt Service  Reductions,  Excess  Special  Hazard
Losses,  Excess Fraud Losses and Excess Bankruptcy  Losses) will be allocated as
follows:

            first,   to  the  Class B-6   Certificates   until  the  Class B-6
      Principal Balance has been reduced to zero;

            second,  to  the  Class B-5   Certificates   until  the  Class B-5
      Principal Balance has been reduced to zero;

            third,   to  the  Class B-4   Certificates   until  the  Class B-4
      Principal Balance has been reduced to zero;

            fourth,  to  the  Class B-3   Certificates   until  the  Class B-3
      Principal Balance has been reduced to zero;

            fifth,   to  the  Class B-2   Certificates   until  the  Class B-2
      Principal Balance has been reduced to zero;

            sixth,   to  the  Class B-1   Certificates   until  the  Class B-1
      Principal Balance has been reduced to zero; and

            seventh,  concurrently,  to the Class A Certificates (other than the
      Class A-PO Certificates) and Class A-PO  Certificates,  pro rata, based on
      the Non-PO Fraction and the PO Fraction, respectively.

This allocation of Realized Losses will be effected through the reduction of the
applicable Class's Principal Balance.

            (b) With respect to any Distribution  Date, the principal portion of
Excess Special Hazard Losses,  Excess Fraud Losses and Excess  Bankruptcy Losses
occurring  with  respect  to any  Mortgage  Loan  allocable  to the  Class  A-PO
Certificates will equal the product of the amount of any such principal loss and
the PO Fraction for such  Mortgage  Loan.  The  principal  portion of any Excess
Special  Hazard  Losses,  Excess  Fraud  Losses  and  Excess  Bankruptcy  Losses
remaining after allocation to the Class A-PO Certificates in accordance with the
preceding  sentence  shall be allocated pro rata among the Class A  Certificates
(other than the Class A-PO  Certificates) and Class B Certificates  based on the
Class  A  Non-PO   Principal   Balance  and  the  Class  B  Principal   Balance,
respectively.  Any such  loss  allocated  to the Class A  Certificates  shall be
allocated on the subsequent  Determination Date among the outstanding Classes of
Class A Certificates (other than the Class A-PO Certificates) in accordance with
the  Class A Loss  Percentages  as of such  Determination  Date.  Any such  loss
allocated  to the Class B  Certificates  shall be  allocated  pro rata among the
outstanding Classes of Class B Certificates based on their Principal Balances.

            (c) Any Realized Losses allocated to a Class of Class A Certificates
or Class B Certificates  pursuant to Section 4.02(a) or Section 4.02(b) shall be
allocated  among  the  Certificates  of such  Class  based on  their  Percentage
Interests.

            (d) In the event that there is a Recovery of an amount in respect of
principal of a Mortgage Loan which had  previously  been allocated as a Realized
Loss  to any  Classes  of  Class  A  Certificates  or any  Classes  of  Class  B
Certificates,  each outstanding Class to which such Realized Loss had previously
been  allocated  shall be entitled to its share (with  respect to the Class A-PO
Certificates,  based on the PO Fraction of such  Mortgage Loan and, with respect
to the Class A Certificates (other than the Class A-PO Certificates) and Class B
Certificates,  based on their  pro rata  share of the  Non-PO  Fraction  of such
Mortgage  Loan)  of  such  Recovery  up to the  amount  of  such  Realized  Loss
previously  allocated  to such  Class  on the  Distribution  Date  in the  month
following  the month in which such  recovery  is  received.  When the  Principal
Balance of a Class of  Certificates  has been reduced to zero,  such Class shall
not be entitled to any share of such  Recovery.  In the event that the amount of
such Recovery exceeds the amount of such Recovery  allocated to each outstanding
Class in accordance with the preceding provisions,  each outstanding Class shall
be entitled to its pro rata share (determined as described above) of such excess
up to the amount of any unrecovered  Realized Loss previously  allocated to such
Class.  Notwithstanding the foregoing  provisions,  but subject to the following
proviso,  if such Recovery  occurs within two years of the  realization  of such
loss and (i) is the  result  of an  event  that  would  have  given  rise to the
repurchase of the related  Mortgage Loan by the Seller  pursuant to Section 2.02
or 2.03, or (ii) represents in whole or part funds which the applicable Servicer
had  received  in  respect  of a  Liquidated  Loan  but  failed  to remit to the
Certificate  Account on or prior to the Business Day preceding the  Distribution
Date following the Applicable  Unscheduled Principal Receipt Period in which the
Mortgage  Loan  became  a  Liquidated  Loan,  such  Recovery  may,  at the  sole
discretion of the Master Servicer,  be treated as a repurchase or an Unscheduled
Principal  Receipt with respect to such  Mortgage  Loan, as the case may be, the
Realized  Loss  previously  recognized  may be  reversed  and  treated  for  all
subsequent purposes as if it had never occurred and the Master Servicer may make
such adjustments to interest or principal  distributions on the Certificates and
to the principal balances of the Certificates as the Master Servicer in its good
faith judgment and sole  discretion  deems  necessary or desirable to effectuate
the  reversal  of the  Realized  Loss  and the  treatment  of such  amount  as a
repurchase or as an Unscheduled  Principal Receipt, as the case may be; provided
that such actions do not result in the aggregate  distributions  made in respect
of each Class of Certificates  whose principal  balances were previously reduced
as a result of such Realized Loss being less than such Class would have received
if such Recovery had been  deposited in the  Certificate  Account on or prior to
the Business Day  preceding  the  Distribution  Date  following  the  Applicable
Unscheduled  Principal  Receipt  Period  in which  the  Mortgage  Loan  became a
Liquidated Loan.

            (e) The interest  portion of Excess Special  Hazard  Losses,  Excess
Fraud Losses and Excess  Bankruptcy  Losses  shall be allocated  between (i) the
Class A Certificates  and the Premium Payment and (ii) the Class B Certificates,
pro rata based on the Class A Interest  Accrual  Amount and the Premium  Payment
and the Class B Interest  Accrual  Amount  for the  related  Distribution  Date,
without  regard  to any  reduction  pursuant  to this  sentence.  Any such  loss
allocated to the Class A Certificates and the Premium Payment shall be allocated
among the  outstanding  Classes of Class A Certificates  and the Premium Payment
based on their Class A Interest  Percentages and the Premium Percentage,  as the
case  may be.  Any such  loss  allocated  to the  Class B  Certificates  will be
allocated among the outstanding  Classes of Class B Certificates  based on their
Class B Interest Percentages.  In addition,  after the Class B Principal Balance
has been reduced to zero,  the interest  portion of Realized  Losses (other than
Excess Special Hazard Losses,  Excess Fraud Losses and Excess Bankruptcy Losses)
will be allocated among the outstanding  Classes of Class A Certificates and the
Premium  Payment  based on their  Class A Interest  Percentages  and the Premium
Percentage, as the case may be.

            (f) Realized  Losses  allocated in accordance with this Section 4.02
will be allocated on the  Determination  Date in the second month  following the
month in which such loss was incurred with respect to the preceding Distribution
Date.

            SECTION 4.03      PAYING AGENT.

            (a) The Master Servicer hereby appoints the Trust  Administrator  as
initial Paying Agent to make distributions to Certificateholders  and to forward
to Certificateholders the periodic statements and the annual statements required
by Section 4.04 as agent of the Master Servicer.

            The Master  Servicer may, at any time,  remove or replace the Paying
Agent.

            The Master  Servicer  shall  cause any Paying  Agent that is not the
Trust  Administrator  to  execute  and  deliver  to the Trust  Administrator  an
instrument in which such Paying Agent agrees with the Trust  Administrator  that
such Paying Agent shall:

            (i)  hold all  amounts remitted  to it by the  Master  Servicer  for
distribution   to    Certificateholders    in   trust   for   the   benefit   of
Certificateholders  until such amounts are distributed to  Certificateholders or
otherwise disposed of as herein provided;

            (ii)  give the Trust  Administrator  notice  of any  default  by the
Master Servicer in remitting any required amount; and

            (iii) at any time during the  continuance of any such default,  upon
the  written  request  of the Trust  Administrator,  forthwith  pay to the Trust
Administrator all amounts held in trust by such Paying Agent.

            (b) The Paying Agent shall establish and maintain a Payment Account,
which shall be a separate  trust account and an Eligible  Account,  in which the
Master  Servicer  shall  cause to be  deposited  from  funds in the  Certificate
Account  or,  to the  extent  required  hereunder,  from its own funds (i) at or
before  10:00  a.m.,   New  York  time,  on  the  Business  Day  preceding  each
Distribution Date, by wire transfer of immediately available funds, any Periodic
Advance for such  Distribution  Date,  pursuant  to Section  3.03 and (ii) at or
before  10:00  a.m.,   New  York  time,  on  the  Business  Day  preceding  each
Distribution  Date,  by wire transfer of  immediately  available  funds,  (a) an
amount equal to the Pool Distribution  Amount, (b) Net Foreclosure  Profits,  if
any, with respect to such  Distribution  Date and (c) the amount of any recovery
in respect of a Realized Loss. The Master Servicer may cause the Paying Agent to
invest  the  funds  in the  Payment  Account.  Any such  investment  shall be in
Eligible  Investments,  which  shall  mature  not later  than the  Business  Day
preceding the related  Distribution  Date (unless the Eligible  Investments  are
obligations of the Trust Administrator,  in which case such Eligible Investments
shall  mature not later than the  Distribution  Date),  and shall not be sold or
disposed  of prior to  maturity.  All  income  and gain  realized  from any such
investment  shall be for the benefit of the Master Servicer and shall be subject
to its withdrawal or order from time to time. The amount of any losses  incurred
in respect of any such investments  shall be deposited in the Payment Account by
the Master  Servicer out of its own funds  immediately  as realized.  The Paying
Agent may withdraw from the Payment Account any amount  deposited in the Payment
Account  that  was not  required  to be  deposited  therein  and may  clear  and
terminate the Payment Account pursuant to Section 9.01.

            SECTION 4.04      STATEMENTS TO CERTIFICATEHOLDERS; REPORT TO THE
TRUST ADMINISTRATOR, AMBAC AND THE SELLER.

            Concurrently with each distribution pursuant to Section 4.01(e), the
Master  Servicer,  or the Paying Agent  appointed by the Master  Servicer  (upon
receipt of such statement from the Master  Servicer),  shall forward or cause to
be  forwarded  by mail to each Holder of a  Certificate,  the Seller and Ambac a
statement setting forth:

            (i) the  amount of such  distribution  to  Holders  of each Class of
Class  A  Certificates  allocable  to  principal,   separately  identifying  the
aggregate amount of any Unscheduled Principal Receipts included therein;

            (ii) (a) the amount of such distribution to Holders of each Class of
Class A Certificates  allocable to interest, (b) the amount of the Current Class
A Interest  Distribution Amount allocated to each Class of Class A Certificates,
(c) any  Class  A  Interest  Shortfall  Amounts  arising  with  respect  to such
Distribution  Date and any  remaining  Class A Unpaid  Interest  Shortfall  with
respect to each Class after giving effect to such  distribution,  (d) the amount
of any  Non-Supported  Interest  Shortfall  allocated  to each  Class of Class A
Certificates for such  Distribution  Date and (e) the interest portion of Excess
Special  Hazard  Losses,  Excess  Fraud  Losses  and  Excess  Bankruptcy  Losses
allocated to each Class for such Distribution Date;

            (iii) the  amount of such  distribution  to Holders of each Class of
Class  B  Certificates  allocable  to  principal,   separately  identifying  the
aggregate amount of any Unscheduled Principal Receipts included therein;

            (iv) (a) the amount of such distribution to Holders of each Class of
Class B Certificates  allocable to interest, (b) the amount of the Current Class
B Interest  Distribution Amount allocated to each Class of Class B Certificates,
(c) any  Class  B  Interest  Shortfall  Amounts  arising  with  respect  to such
Distribution  Date and any  remaining  Class B Unpaid  Interest  Shortfall  with
respect  to each  Class of Class B  Certificates  after  giving  effect  to such
distribution,  (d) the amount of any Non-Supported  Interest Shortfall allocated
to each Class of Class B Certificates  for such  Distribution  Date, and (e) the
interest portion of Excess Special Hazard Losses, Excess Fraud Losses and Excess
Bankruptcy  Losses  allocated  to each  Class of Class B  Certificates  for such
Distribution Date;

            (v) the amount of any Periodic  Advance by any  Servicer, the Master
Servicer or the Trust Administrator pursuant to the Servicing Agreements or this
Agreement;

            (vi) the number of Mortgage  Loans  outstanding  as of the preceding
Determination Date;

            (vii) the Class A Principal  Balance,  the Principal Balance of each
Class of Class A Certificates,  the Class B Principal  Balance and the Principal
Balance of each Class of Class B Certificates as of the following  Determination
Date  after  giving  effect to the  distributions  of  principal  made,  and the
principal  portion of Realized  Losses,  if any,  allocated with respect to such
Distribution Date;

            (viii) the  Adjusted  Pool  Amount,  the  Adjusted  Pool  Amount (PO
Portion),  the Pool Scheduled  Principal  Balance of the Mortgage Loans for such
Distribution Date and the aggregate  Scheduled Principal Balance of the Discount
Mortgage Loans for such Distribution Date;

            (ix) the  aggregate  Scheduled  Principal  Balances of the  Mortgage
Loans serviced by Norwest Mortgage and, collectively,  by the Other Servicers as
of such Distribution Date;

            (x)  the Class A Percentage for  the  following  Distribution  Date
(without  giving effect to  Unscheduled  Principal  Receipts  received after the
Applicable  Unscheduled  Principal  Receipt Period for the current  Distribution
Date which are applied by a Servicer during such Applicable Unscheduled
Principal Receipt Period);

            (xi)  the  Class  A   Prepayment   Percentage   for  the   following
Distribution  Date (without  giving  effect to  Unscheduled  Principal  Receipts
received  after the  Applicable  Unscheduled  Principal  Receipt  Period for the
current Distribution Date which are applied by a Servicer during such Applicable
Unscheduled Principal Receipt Period);

            (xii)  the Class B-1, Class B-2, Class B-3, Class B-4, Class B-5 and
Class B-6 Percentages for the following Distribution Date (without giving effect
to Unscheduled  Principal  Receipts  received  after the Applicable  Unscheduled
Principal Receipt Period for the current  Distribution Date which are applied by
a Servicer during such Applicable Unscheduled
Principal Receipt Period);

            (xiii) the Class B-1, Class B-2, Class B-3, Class B-4, Class B-5 and
Class B-6 Prepayment  Percentages for the following  Distribution  Date (without
giving effect to Unscheduled  Principal  Receipts  received after the Applicable
Unscheduled Principal Receipt Period for the current Distribution Date which are
applied by a Servicer  during  such  Applicable  Unscheduled  Principal  Receipt
Period);

            (xiv) the number and aggregate principal balances of Mortgage Loans
delinquent (a) one month, (b) two months and (c) three months or more;

            (xv) the number and  aggregate  principal  balances of the  Mortgage
Loans in foreclosure as of the preceding Determination Date;

            (xvi) the book value of any real estate acquired through foreclosure
or grant of a deed in lieu of foreclosure;

            (xvii) the amount of the remaining Special Hazard Loss Amount, Fraud
Loss  Amount and  Bankruptcy  Loss  Amount as of the close of  business  on such
Distribution Date;

            (xviii) the  principal  and  interest  portions  of Realized  Losses
allocated as of such  Distribution  Date and the amount of such Realized  Losses
constituting  Excess  Special  Hazard  Losses,  Excess  Fraud  Losses  or Excess
Bankruptcy Losses;

            (xix) the aggregate  amount of Bankruptcy  Losses  allocated to each
Class of Class B  Certificates  in  accordance  with Section  4.02(a)  since the
Relevant Anniversary;

            (xx) the  amount by which the  Principal  Balance  of each  Class of
Class B Certificates  has been reduced as a result of Realized Losses  allocated
as of such Distribution Date;

            (xxi) the unpaid principal  balance of any Mortgage Loan as to which
the Servicer of such Mortgage Loan has  determined  not to foreclose  because it
believes the related Mortgaged  Property may be contaminated with or affected by
hazardous wastes or hazardous substances;

            (xxii)  the  amount  of the  aggregate  Servicing  Fees  and  Master
Servicing  Fees paid (and not  previously  reported) with respect to the related
Distribution  Date  and the  amount  by which  the  aggregate  Available  Master
Servicer  Compensation has been reduced by the Prepayment Interest Shortfall for
the related Distribution Date;

            (xxiii) the Class A-PO Deferred Amount, if any;

            (xxiv) in the case of the Class A-3 Certificates,  (a) the Class A-3
Distribution Deficiency, if any, for such Distribution Date, (b) amounts, if any
in respect of the Class A-3  Distribution  Deficiency  paid under the Policy and
(c) the amounts attributable to the Class A-3 Certificates;

            (xxv)  in the  case  of  the  Class  A-3  Certificates,  the  amount
remaining in the Reserve  Fund after taking into account the Reserve  Withdrawal
for such Distribution Date; and

            (xxvi) such other customary information as the Master Servicer deems
necessary  or  desirable  to  enable  Certificateholders  to  prepare  their tax
returns;

and shall  deliver a copy of each type of statement to the Trust  Administrator,
who shall provide copies thereof to Persons making written  request  therefor at
the Corporate Trust Office.

            In the case of  information  furnished  with  respect  to a Class of
Class A Certificates  pursuant to clauses (i) and (ii) above and with respect to
a Class of Class B  Certificates  pursuant to clauses (iii) and (iv) above,  the
amounts shall be expressed as a dollar amount per Class A or Class B Certificate
(other  than the Class A-R  Certificate)  with a $1,000  Denomination,  and as a
dollar amount per Class A-R Certificate with a $100 Denomination.

            Within a  reasonable  period of time after the end of each  calendar
year, the Master  Servicer 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 the information set forth in clauses (i) and (ii)(a) above
in the case of a Class A  Certificateholder  and the  information  set  forth in
clauses  (iii)  and  (iv)(a)  above in the  case of a Class B  Certificateholder
aggregated  for such calendar year or applicable  portion  thereof  during which
such Person was a  Certificateholder.  Such  obligation  of the Master  Servicer
shall  be  deemed  to have  been  satisfied  to the  extent  that  substantially
comparable  information shall be provided by the Master Servicer pursuant to any
requirements of the Code from time to time in force.

            Prior to the close of business on the third  Business Day  preceding
each  Distribution  Date,  the Master  Servicer shall furnish a statement to the
Trust  Administrator,  any Paying Agent and the Seller (the  information in such
statement to be made available to  Certificateholders  by the Master Servicer on
written request)  setting forth the Class A Distribution  Amount with respect to
each Class of Class A  Certificates  and the Class B  Distribution  Amount  with
respect  to each  Class  of  Class B  Certificates.  Upon  receipt  of any  such
statement,  the  Trust  Administrator  shall  promptly  forward  a copy  of such
statement to Ambac.  The  determination  by the Master  Servicer of such amounts
shall,  in the absence of obvious error, be  presumptively  deemed to be correct
for all  purposes  hereunder  and the Trust  Administrator  and the Paying Agent
shall be protected in relying  upon the same  without any  independent  check or
verification.

            In addition to the reports  required  pursuant to this Section 4.04,
the Master  Servicer  shall make  available upon request to each Holder and each
proposed  transferee  of a  Class  A-PO,  Class  B-4,  Class  B-5 or  Class  B-6
Certificate  such additional  information,  if any, as may be required to permit
the proposed transfer to be effected pursuant to Rule 144A.

            SECTION 4.05      REPORTS TO MORTGAGORS AND THE INTERNAL  REVENUE
SERVICE.

            The Master  Servicer shall, in each year beginning after the Cut-Off
Date,  make the  reports  of  foreclosures  and  abandonments  of any  Mortgaged
Property  as  required  by Code  Section  6050J.  In  order to  facilitate  this
reporting process,  the Master Servicer shall request that each Servicer,  on or
before January 15th of each year, shall provide to the Internal Revenue Service,
with copies to the Master Servicer,  reports relating to each instance occurring
during the previous  calendar  year in which such  Servicer (i) on behalf of the
Trust  Administrator  acquires  an  interest  in a  Mortgaged  Property  through
foreclosure or other comparable  conversion in full or partial satisfaction of a
Mortgage  Loan  serviced by such  Servicer,  or (ii) knows or has reason to know
that a Mortgaged  Property has been abandoned.  Reports from the Servicers shall
be in form and substance  sufficient to meet the reporting  requirements imposed
by Code Section  6050J.  In addition,  each  Servicer  shall  provide the Master
Servicer with  sufficient  information to allow the Master Servicer to, for each
year ending after the Cut-Off  Date,  provide,  or cause to be provided,  to the
Internal  Revenue  Service and the  Mortgagors  such  information as is required
under Code Sections 6050H  (regarding  payment of interest) and 6050P (regarding
cancellation of indebtedness).

            SECTION 4.06      RESERVE FUND.

            (a)   The  Reserve Fund shall be established on the Closing Date and
maintained by the Trust  Administrator  in accordance with this Section 4.06. At
the time the Reserve Fund is established, the Seller shall cause to be deposited
into the Reserve Fund the amount of $2,500.00.

            With respect to each Distribution Date, the Reserve Withdrawal shall
be  withdrawn  by the Trust  Administrator  from the  amount on  deposit  in the
Reserve  Fund in  accordance  with this  Section  4.06 and  distributed  on such
Distribution Date to the Holders of the Class A-3 Certificates,  pro rata, based
on Percentage Interest.

            Notwithstanding anything herein to the contrary, on the Distribution
Date on which the Class A Principal  Balance of the Class A-3  Certificates  has
been  reduced to zero,  any funds then on deposit in the  Reserve  Fund shall be
distributed  to  Lehman  Brothers  at the  address  provided  by it to the Trust
Administrator.

            (b)   The  Reserve Fund will be an "outside  reserve fund" under the
REMIC  Provisions that is beneficially  owned for federal income tax purposes by
Lehman  Brothers,  which shall report all income,  gain,  deduction or loss with
respect thereto, and will not be an asset of the REMIC.

            SECTION 4.07      DISTRIBUTIONS  IN  REDUCTION  OF THE  CLASS A-3
CERTIFICATES.

            Distributions  in reduction of the Class A Principal  Balance of the
Class  A-3  Certificates  will be made in  integral  multiples  of $1,000 at the
request of the appropriate representatives of Deceased Holders of such Class and
at the request of Living Holders of such Class or by mandatory  distributions by
random  lot,  pursuant  to  clauses  (a) and (d)  below,  or on a pro rata basis
pursuant to clause (f) below.

            (a)   On each Distribution Date on which  distributions in reduction
of the Class A Principal  Balance of the Class A-3  Certificates  are made, such
distributions will be made with respect to such Class in the following priority:

            (i)  any request by the personal representatives of a Deceased
Holder or by a surviving tenant by the entirety,  by a surviving joint tenant or
by a  surviving  tenant in common,  but not  exceeding  an  aggregate  principal
balance for such Class of $100,000 per request; and

            (ii) any request by a Living Holder,  but not exceeding an aggregate
principal balance for such Class of $10,000 per request.

            Thereafter,  distributions will be made, with respect to such Class,
as provided in clauses (i) and (ii) above up to a second  $100,000  and $10,000,
respectively.  This sequence of priorities will be repeated for each request for
principal  distributions  for such  Class made by the  Beneficial  Owners of the
Class A-3 Certificates until all such requests have been honored.

            For each such sequence of priorities  described above,  requests for
distributions  in reduction of the principal  balances of Class A-3 Certificates
presented on behalf of Deceased  Holders in  accordance  with the  provisions of
clause  (i) above will be  accepted  in order of their  receipt by the  Clearing
Agency and requests for  distributions in reduction of the principal  balance of
Class A-3  Certificates  presented  by Living  Holders  in  accordance  with the
provisions  of clause (ii) above will be accepted in the order of their  receipt
by the Clearing  Agency after all requests with respect to such Class  presented
in accordance with clause (i) have been honored.  All requests for distributions
in reduction of the  principal  balances of the Class A-3  Certificates  will be
accepted in accordance  with the  provisions set forth in Section  4.07(c).  All
requests for  distributions  in reduction of the principal  balance of Class A-3
Certificates  with  respect to any  Distribution  Date must be  received  by the
Clearing  Agency and forwarded to, and received by, the Trust  Administrator  no
later than the close of  business  on the  related  Record  Date.  Requests  for
distributions  which are received by the Clearing  Agency and  forwarded to, and
received by, the Trust Administrator after the related Record Date and requests,
in either case, for  distributions not accepted with respect to any Distribution
Date,  will be  treated  as  requests  for  distributions  in  reduction  of the
principal balance of Class A-3 Certificates on the next succeeding  Distribution
Date, and each succeeding Distribution Date thereafter,  until each such request
is accepted or is withdrawn as provided in Section 4.07(c). Such requests as are
not so withdrawn  shall retain their order of priority  without the need for any
further action on the part of the  appropriate  Beneficial  Owner of the related
Class A-3  Certificate,  all in accordance  with the  procedures of the Clearing
Agency and the Trust Administrator. Upon the transfer of beneficial ownership of
any Class A-3 Certificate,  any distribution  request previously  submitted with
respect to such  Certificate will be deemed to have been withdrawn only upon the
receipt by the Trust  Administrator  of  notification  of such withdrawal in the
manner required by the Clearing Agency under its APUT System.

            Distributions  in reduction of the  principal  balances of the Class
A-3 Certificates  will be applied,  in the aggregate with respect to such Class,
in an amount equal to the Class A Non-PO Principal Distribution Amount allocable
to such Class pursuant to Section 4.01(b) plus any amounts  distributable to the
Class A-3  Certificates  as a payment  under the Policy of a Class A-3 Principal
Loss Amount of the type described in clause (i) of the definition thereof, minus
amounts to repay any funds  withdrawn  from the  Rounding  Account for the prior
Distribution Date, plus any amounts available for distribution from the Rounding
Account for such Class established as provided in Section 4.07(e), provided that
the aggregate distribution in reduction of the Class A Principal Balance of such
Class on any Distribution Date is made in an integral multiple of $1,000.

            To the  extent  that the  portion  of the  Class A Non-PO  Principal
Distribution  Amount  allocable  to  distributions  in  reduction of the Class A
Principal  Balance of the Class A-3 Certificates on any  Distribution  Date plus
any amounts  distributable  to the Class A-3 Certificates as a payment under the
Policy of a Class A-3 Principal  Loss Amount of the type described in clause (i)
of the definition  hereof (minus  amounts to repay any funds  withdrawn from the
Rounding Account on the prior Distribution Date and plus any amounts required to
be distributed  from the Rounding  Account  pursuant to Section 4.07(e)) exceeds
the aggregate principal balances of Class A-3 Certificates with respect to which
distribution  requests, as set forth above, have been received  distributions in
reduction of the Class A Principal Balance of the Class A-3 Certificates will be
made by mandatory distribution pursuant to Section 4.07(d).

            (b)   A  Class  A-3  Certificate  shall  be  deemed  to be held by a
Deceased Holder for purposes of this Section 4.07 if the death of the Beneficial
Owner thereof is deemed to have occurred.  Class A-3  Certificates  beneficially
owned by tenants by the  entirety,  joint  tenants or tenants in common  will be
considered to be beneficially  owned by a single owner. The death of a tenant by
the entirety, joint tenant or tenant in common will be deemed to be the death of
the Beneficial Owner, and the Class A-3 Certificates so beneficially  owned will
be eligible  for  priority  with  respect to  distributions  in reduction of the
principal  balance of such Class  thereof,  subject  to the  limitations  stated
above.  Class A-3 Certificates  beneficially owned by a trust will be considered
to be beneficially  owned by each beneficiary of the trust to the extent of such
beneficiary's  beneficial  interest  therein,  but in no  event  will a  trust's
beneficiaries  collectively  be  deemed to be  Beneficial  Owners of a number of
Individual  Class A-3  Certificates  greater than the number of Individual Class
A-3 Certificates of which such trust is the owner. The death of a beneficiary of
a trust  will be deemed to be the death of a  Beneficial  Owner of the Class A-3
Certificates owned by the trust to the extent of such  beneficiary's  beneficial
interest  in such  trust.  The  death of an  individual  who was a tenant by the
entirety, joint tenant or tenant in common in a tenancy which is the beneficiary
of a trust will be deemed to be the death of the beneficiary of such trust.  The
death of a person who, during his or her lifetime, was entitled to substantially
all of the beneficial  ownership  interests in Individual Class A-3 Certificates
will be  deemed  to be the  death  of the  Beneficial  Owner of such  Class  A-3
Certificates  regardless of the  registration  of ownership,  if such beneficial
interest can be established to the satisfaction of the Trust Administrator. Such
beneficial  interest  will be deemed to exist in typical cases of street name or
nominee  ownership,  ownership  by a Trust  Administrator,  ownership  under the
Uniform  Gifts to Minors Act and  community  property or other  joint  ownership
arrangements between a husband and wife.  Beneficial interests shall include the
power to sell,  transfer or otherwise dispose of a Class A-3 Certificate and the
right to receive the proceeds  therefrom,  as well as interest and distributions
in reduction of the  principal  balances of the Class A-3  Certificates  payable
with respect  thereto.  The Trust  Administrator  shall not be under any duty to
determine  independently the occurrence of the death of any deceased  Beneficial
Owner. The Trust Administrator may rely entirely upon documentation delivered to
it pursuant to Section 4.07(c) in establishing the eligibility of any Beneficial
Owner to receive the priority accorded Deceased Holders in Section 4.07(a).

            (c)   Requests  for  distributions  in  reduction  of the  principal
balance of Class A-3  Certificates  must be made by delivering a written request
therefor  to  the  Clearing  Agency  Participant  or  Clearing  Agency  Indirect
Participant  that  maintains  the account  evidencing  such  Beneficial  Owner's
interest  in Class A-3  Certificates.  In the case of a  request  on behalf of a
Deceased Holder,  appropriate evidence of death and any tax waivers are required
to be forwarded to the Trust  Administrator  under separate cover.  The Clearing
Agency  Participant  should in turn make the request of the Clearing Agency (or,
in the case of a Clearing  Agency  Indirect  Participant,  such Clearing  Agency
Indirect Participant must notify the related Clearing Agency Participant of such
request,  which  Clearing  Agency  Participant  should  make the  request of the
Clearing  Agency) in the manner  required under the rules and regulations of the
Clearing  Agency's APUT System and provided to the Clearing Agency  Participant.
Upon receipt of such request,  the Clearing Agency will date and time stamp such
request and forward such request to the Trust Administrator. The Clearing Agency
may  establish  such  procedures as it deems fair and equitable to establish the
order of receipt of requests for such  distributions  received by it on the same
day. Neither the Master Servicer nor the Trust Administrator shall be liable for
any delay in delivery of  requests  for  distributions  or  withdrawals  of such
requests by the Clearing Agency,  a Clearing Agency  Participant or any Clearing
Agency Indirect Participant.

            The Trust  Administrator  shall  maintain  a list of those  Clearing
Agency Participants  representing the appropriate Beneficial Owners of Class A-3
Certificates that have submitted  requests for distributions in reduction of the
principal  balance of  Certificates  of such Class,  together  with the order of
receipt  and the  amounts  of such  requests.  The  Clearing  Agency  will honor
requests  for  distributions  in the  order of  their  receipt  (subject  to the
priorities  described in Section 4.07(a) above). The Trust  Administrator  shall
notify the Clearing Agency and the appropriate  Clearing Agency  Participants as
to which requests should be honored on each Distribution Date. Requests shall be
honored by the Clearing Agency in accordance with the procedures, and subject to
the  priorities  and  limitations,  described  in this Section  4.07.  The exact
procedures to be followed by the Trust Administrator and the Clearing Agency for
purposes  of  determining   such  priorities  and  limitations   will  be  those
established from time to time by the Trust Administrator or the Clearing Agency,
as the case may be. The  decisions of the Trust  Administrator  and the Clearing
Agency  concerning  such  matters  will be final  and  binding  on all  affected
persons.

            Individual  Class A-3  Certificates  which have been  accepted for a
distribution shall be due and payable on the applicable  Distribution Date. Such
Certificates  shall  cease to bear  interest  after  the  last day of the  month
preceding the month in which such Distribution Date occurs, and  notwithstanding
anything to the contrary herein, no amounts shall be due from Ambac or otherwise
with respect to interest on such Certificates after such last day of the month.

            Any Beneficial Owner of a Class A-3 Certificate  which has requested
a distribution  may withdraw its request by so notifying in writing the Clearing
Agency  Participant or Clearing Agency Indirect  Participant that maintains such
Beneficial  Owner's  account.  In the event that such account is maintained by a
Clearing Agency Indirect Participant,  such Clearing Agency Indirect Participant
must notify the related Clearing Agency  Participant  which in turn must forward
the withdrawal of such request,  on a form required by the Clearing  Agency,  to
the  Trust  Administrator.  If  such  notice  of  withdrawal  of a  request  for
distribution  has not been received by the Clearing  Agency and forwarded to the
Trust Administrator on or before the Record Date for the next Distribution Date,
the previously made request for distribution will be irrevocable with respect to
the making of  distributions  in reduction  of the Class A Principal  Balance of
Class A-3 Certificates on such Distribution Date.

            In the event any  requests  for  distributions  in  reduction of the
principal   balance  of  Class  A-3  Certificates  are  rejected  by  the  Trust
Administrator  for failure to comply with the requirements of this Section 4.07,
the Trust  Administrator  shall return such request to the appropriate  Clearing
Agency  Participant with a copy to the Clearing Agency with an explanation as to
the reason for such rejection.

            (d)   To the extent, if any, that  distributions in reduction of the
Class A  Principal  Balance of Class A-3  Certificates  on a  Distribution  Date
exceed the  outstanding  principal  balances of  Certificates of such Class with
respect to which distribution  requests have been received by the related Record
Date, as provided in Section  4.07(a) above,  distributions  in reduction of the
Class  A  Principal  Balance  of the  Class  A-3  Certificates  will  be made by
mandatory  distributions in reduction thereof.  Such mandatory  distributions on
Individual Class A-3 Certificates  will be made by random lot in accordance with
the  then-applicable  random lot procedures of the Clearing Agency, the Clearing
Agency Participants and the Clearing Agency Indirect  Participants  representing
the Beneficial  Owners;  provided  however,  that, if after the  distribution in
reduction of the Class A Principal  Balance of the Class A-3 Certificates on the
next succeeding  Distribution  Date on which mandatory  distributions  are to be
made, the principal  balance of Class A-3  Certificates  would not be reduced to
zero, the Individual Class A-3 Certificates to which such  distributions will be
applied  shall  be  selected  by  the  Clearing  Agency  from  those  Class  A-3
Certificates not otherwise receiving distributions in reduction of the principal
balance on such  Distribution  Date.  The Trust  Administrator  shall notify the
Clearing  Agency  of the  aggregate  amount  of the  mandatory  distribution  in
reduction of the Class A Principal  Balance of the Class A-3  Certificates to be
made on the next Distribution Date. The Clearing Agency shall then allocate such
aggregate  amount among its Clearing Agency  Participants on a random lot basis.
Each Clearing  Agency  Participant  and, in turn,  each Clearing Agency Indirect
Participant will then select,  in accordance with its own random lot procedures,
Individual  Class A-3  Certificates  from among  those held in its  accounts  to
receive  mandatory  distributions  in reduction of the principal  balance of the
Certificates  of such Class,  such that the total amount so selected is equal to
the aggregate amount of such mandatory  distributions allocated to such Clearing
Agency  Participant by the Clearing  Agency and to such Clearing Agency Indirect
Participant  by its related  Clearing  Agency  Participant,  as the case may be.
Clearing Agency  Participants  and Clearing Agency Indirect  Participants  which
hold Class A-3 Certificates selected for mandatory distributions in reduction of
the  principal  balances  are  required  to  provide  notice  of such  mandatory
distributions to the affected  Beneficial  Owners. The Master Servicer agrees to
notify the Trust  Administrator  of the amount of  distributions in reduction of
the principal balances of Class A-3 Certificates to be made on each Distribution
Date in a timely  manner  such  that the Trust  Administrator  may  fulfill  its
obligations  pursuant to the Letter of  Representations  dated the  Business Day
immediately preceding the Closing Date among the Seller, the Trust Administrator
and the Clearing Agency.

            (e)   On the Closing Date, the Rounding Account shall be established
with  the  Trust  Administrator  and the  Seller  shall  cause  to be  initially
deposited  with the Trust  Administrator  a  $999.99  deposit  for the  Rounding
Account.  On each Distribution Date on which a distribution is made in reduction
of the principal balance of the Class A-3 Certificates,  funds on deposit in the
Rounding Account shall be available to be applied to round upward to an integral
multiple  of $1,000  the  aggregate  distribution  in  reduction  of the Class A
Principal  Balance to be made on the Class A-3  Certificates.  Rounding  of such
distribution on the Class A-3 Certificates  shall be accomplished,  on the first
such  Distribution  Date, by withdrawing from the Rounding Account the amount of
funds,  if any,  needed  to  round  the  amount  otherwise  available  for  such
distribution in reduction of the principal balance of the Class A-3 Certificates
upward to the next integral multiple of $1,000. On each succeeding  Distribution
Date on which  distributions in reduction of the principal  balance of the Class
A-3  Certificates  are to be made,  the aggregate  amount of such  distributions
allocable  to the Class A-3  Certificates  shall be  applied  first to repay any
funds  withdrawn from the Rounding  Account on the prior  Distribution  Date for
which funds were  withdrawn  from such  account,  and then the remainder of such
allocable  amount,  if any,  shall be  similarly  rounded  upward and applied as
distributions   in  reduction  of  the  principal   balance  of  the  Class  A-3
Certificates; this process shall continue on succeeding Distribution Dates until
the Class A Principal  Balance of the Class A-3 Certificates has been reduced to
zero. The funds in the Rounding Account shall be held in a non-interest  bearing
account and shall not be reinvested.

            Notwithstanding anything herein to the contrary, on the Distribution
Date on which distributions in reduction of the Class A Principal Balance of the
Class A-3 Certificates will reduce the Class A Principal Balance thereof to zero
or in the event that distributions in reduction of the Class A Principal Balance
of the Class A-3  Certificates  are made in accordance  with the  provisions set
forth in Section 4.07(f),  an amount equal to the difference  between $1,000 and
the  sum  then  held  in the  Rounding  Account  shall  be paid  from  the  Pool
Distribution  Amount to the Rounding Account.  Any funds then on deposit in such
Rounding   Account  shall  be  distributed  to  the  Holder  of  the  Class  A-R
Certificate.

            (f)   Notwithstanding any provisions herein to the contrary, on each
Distribution Date on and after Ambac's failure to make a payment with respect to
a Class A-3 Distribution Deficiency, distributions in reduction of the Principal
Balance of the Class A-3 Certificates (including amounts paid in respect of such
losses  under the Policy)  will be made on a pro rata basis among the Holders of
the Class A-3 Certificates and will not be made in integral  multiples of $1,000
or pursuant to requested distributions or mandatory distributions by random lot.

            (g)   In  the event  that the pro rata  distributions  described  in
section  4.07(f) cannot be made through the  facilities of the Clearing  Agency,
the Class A-3 Certificates will be withdrawn from the facilities of the Clearing
Agency and  Definitive  Certificates  will be issued to replace  such  withdrawn
Book-Entry   Certificates  pursuant  to  Section  5.07.  An  amendment  to  this
Agreement,  which may be approved without the consent of any Certificateholders,
shall   establish   procedures   relating  to  the  manner  in  which  pro  rata
distributions  in  reduction  of  the  principal   balances  of  the  Class  A-3
Certificates are to be made;  provided that such procedures shall be consistent,
to the extent  practicable and customary for  certificates  similar to the Class
A-3 Certificates, with the provisions of this Section 4.07.

            SECTION 4.08      POLICY MATTERS.

            (a)   If,  on the second Business Day before any Distribution  Date,
the Trust  Administrator  determines that there will be a Class A-3 Distribution
Deficiency for such Distribution Date, the Trust  Administrator  shall determine
the amount of such Class A-3  Distribution  Deficiency  and shall give notice to
Ambac by  telephone  or telecopy of the amount of such  deficiency  confirmed in
writing by the Notice of  Nonpayment  by 12:00 noon,  New York City time on such
second Business Day.

            (b)   At the time of the execution  and delivery of this  Agreement,
the Trust Administrator shall establish a separate special purpose trust account
in the name of the Trust  Administrator  for the benefit of Holders of the Class
A-3 Certificates  referred to herein as the "Policy Payments Account" over which
the  Trust  Administrator  shall  have  exclusive  control  and  sole  right  of
withdrawal.  The Trust  Administrator  shall  deposit any amounts paid under the
Policy into the Policy  Payments  Account and  distribute  such amounts only for
purposes  of payment to Holders of the Class A-3  Certificates  of the Class A-3
Distribution  Deficiency  for which a claim was made and such amounts may not be
applied to satisfy any costs, expenses or liabilities of the Trust Administrator
or the Trust  Estate.  Amounts  paid under the Policy  shall be disbursed by the
Trust  Administrator to Holders of the Class A-3 Certificates in the same manner
as  distributions  in reduction of the principal  balance of and interest on the
Certificates  of such  Class are made  under  Section  4.01(e).  It shall not be
necessary for such payments of the Class A-3 Distribution  Deficiency to be made
by checks or wire transfers separate from the check or wire transfer used to pay
distributions in reduction of the principal balance of and interest on the Class
A-3 Certificates with funds available to make such distributions.  However,  the
amount of any  distribution  to be paid from funds  transferred  from the Policy
Payments Account shall be noted as provided in (c) below and in the statement to
be  furnished  to Holders of the Class A-3  Certificates  and Ambac  pursuant to
Section 4.04. Funds held in the Policy Payments Account shall not be invested by
the Trust Administrator.

            On any Distribution Date with respect to which a claim has been made
under the Policy, the amount of any funds received by the Trust Administrator as
a  result  of the  claim  under  the  Policy  to the  extent  necessary  to make
distributions on the Class A-3 Certificates  equal to the Class A-3 Distribution
Deficiency on such Distribution Date shall be withdrawn from the Policy Payments
Account  and  applied by the Trust  Administrator  to the payment in full of the
Class A-3 Distribution Deficiency.  Any funds deposited into the Policy Payments
Account in respect of the Class A-3 Certificates  that are remaining  therein on
the  first  Business  Day  following  a  Distribution  Date  after the Class A-3
Distribution  Deficiency has been made to the  Certificateholders  of such Class
shall be  remitted  in  immediately  available  funds to Ambac,  pursuant to the
instructions of Ambac, by the end of such Business Day.

            (c)   The  Trust  Administrator  shall keep a complete  and accurate
record of the Class A-3  Interest  Loss  Amount,  the Class A-3  Principal  Loss
Amount  and any  Non-Supported  Interest  Shortfall  allocated  to the Class A-3
Certificates once the Reserve Fund has been depleted,  paid from moneys received
under  the  Policy.  Ambac  shall  have the right to  inspect  such  records  at
reasonable   times  upon  one   Business   Day's  prior   notice  to  the  Trust
Administrator.

            (d)   In  the event  that the Trust  Administrator  has  received  a
certified copy of an order of the appropriate  court that any  distributions  in
reduction of the principal balance of or interest on a Class A-3 Certificate has
been  avoided  in  whole or in part as a  preference  payment  under  applicable
bankruptcy law, the Trust  Administrator  shall so notify Ambac and shall comply
with the provisions of the applicable  Policy to obtain payment by Ambac of such
avoided  distribution,  and  shall,  at the time it  provides  notice  to Ambac,
notify,  by mail to Holders of the Certificates of such Class that, in the event
that any Holder's distribution is so recovered,  such Holder will be entitled to
payment pursuant to the terms of the applicable Policy, a copy of which shall be
made  available by the Trust  Administrator  and the Trust  Administrator  shall
furnish to Ambac its records  evidencing the  distributions  in reduction of the
principal  balance  of  and  interest  (including  any  Non-Supported   Interest
Shortfall  described in Section 4.08(c)) on the Class A-3 Certificates,  if any,
which have been made by the Trust Administrator and subsequently  recovered from
Holders, and the dates on which such distributions were made. Such payment under
the  applicable  Policy  shall  be  disbursed  to  the  receiver,   conservator,
debtor-in-possession or Trust Administrator in bankruptcy named in the order and
not to the  Trust  Administrator  or any Class  A-3  Certificateholder  directly
(unless such  Certificateholder has previously paid such amount to the receiver,
conservator,  debtor-in-possession or Trust Administrator in bankruptcy named in
the  order,  in  which  case  such  payment  shall  be  disbursed  to the  Trust
Administrator  for  distribution  to such  Certificateholder  upon proof of such
payment reasonably satisfactory to Ambac).

            (e)   The  Trust  Administrator  shall promptly  notify Ambac of any
proceeding  or  the  institution  of  any  action  seeking  the  avoidance  as a
preferential transfer under applicable bankruptcy,  insolvency,  receivership or
similar law (a "Preference  Claim") of any distribution made with respect to the
Class A-3  Certificates  as to which it has actual  knowledge.  Each Holder of a
Class  A-3  Certificate,  by its  purchase  of such  Certificates  and the Trust
Administrator  hereby agree that Ambac (so long as no Ambac Default  exists) may
at any time during the  continuation of any proceeding  relating to a Preference
Claim direct all matters relating to such Preference Claim,  including,  without
limitation,  (i) the  direction  of any  appeal  of any  order  relating  to any
Preference Claim and (ii) the posting of any surety,  supersedeas or performance
bond  pending  any such  appeal.  In  addition  and  without  limitation  of the
foregoing,  Ambac shall be subrogated  to the rights of the Trust  Administrator
and each  Holder in the  conduct of any  Preference  Claim,  including,  without
limitation,  all rights of any party to an adversary  proceeding  or action with
respect to any court order issued in connection with any such Preference Claim.

            (f)   The  Trust  Administrator  acknowledges,  and each Holder of a
Class A-3 Certificate by its acceptance of such Certificate agrees, that without
any further action on the part of Ambac, Ambac shall be subrogated to all of the
rights to amounts distributable to such Certificateholders in respect of Class A
Unpaid Interest Shortfalls,  Non-Supported Interest Shortfalls allocated to such
Certificates  and  recoveries,  if any,  with respect to the Class A-3 Principal
Loss  Amounts  with  respect to amounts  paid  under the  Policy.  The Class A-3
Certificateholders  by  acceptance of such  Certificates  assign their rights as
Holders of such  Certificates  to Ambac to the extent of Ambac's  interest  with
respect to amounts paid.

            (g)   The  Master  Servicer shall  designate an Ambac Contact Person
who shall be  available  to Ambac to provide  reasonable  access to  information
regarding the Mortgage  Loans.  The initial Ambac Contact Person is appointed in
Section 11.27.

            (h)   The  Trust  Administrator  shall surrender the Policy to Ambac
for  cancellation  upon the  expiration of the term of the Policy as provided in
the Policy.

            (i)   The Trust  Administrator upon receipt from the Master Servicer
shall  send to Ambac  the  report  prepared  pursuant  to  Section  3.05 and the
statements prepared pursuant to Section 4.04.

            SECTION 4.09      CALCULATION  OF  AMOUNTS;  BINDING  EFFECT  OF
INTERPRETATIONS AND ACTIONS OF MASTER SERVICER.

            The Master Servicer will compute the amount of all  distributions to
be made on the Certificates and all losses to be allocated to the  Certificates.
In  the  event  that  the  Master  Servicer  concludes  that  any  ambiguity  or
uncertainty exists in any provisions of this Agreement relating to distributions
to be made on the Certificates or the allocation of losses to the  Certificates,
the  interpretation  of such  provisions  and any  actions  taken by the  Master
Servicer in good faith to implement  such  interpretation  shall be binding upon
Certificateholders.


<PAGE>







                                    ARTICLE V

                                THE CERTIFICATES

            SECTION 5.01      THE CERTIFICATES.

            (a) The Class A and  Class B  Certificates  shall be issued  only in
minimum  Denominations  of a Single  Certificate and, except for the Class A-PO,
Class A-R, Class B-5 and Class B-6 Certificates, integral multiples of $1,000 in
excess thereof (except,  if necessary,  for one Certificate of each Class (other
than Class A-PO, Class A-R, Class B-5 and Class B-6 Certificates) that evidences
one Single Certificate plus such additional  principal portion as is required in
order  for all  Certificates  of such  Class to  equal  the  aggregate  Original
Principal Balance of such Class, as the case may be), and shall be substantially
in the  respective  forms set forth as Exhibits A-1, A-2, A-3, A-4,  A-PO,  A-R,
B-1, B-2, B-3, B-4,  B-5, B-6 and C (reverse side of  Certificates)  hereto.  On
original  issue the  Certificates  shall be executed and  delivered by the Trust
Administrator  to or upon the  order of the  Seller  upon  receipt  by the Trust
Administrator  or the Custodian of the documents  specified in Section 2.01. The
aggregate  principal  portion  evidenced by the Class A and Class B Certificates
shall  be the  sum of the  amounts  specifically  set  forth  in the  respective
Certificates.  The  Certificates  shall  be  executed  by  manual  or  facsimile
signature  on behalf  of the  Trust  Administrator  by any  Responsible  Officer
thereof.  Certificates bearing the manual or facsimile signatures of individuals
who were at any time the proper officers of the Trust  Administrator  shall bind
the Trust  Administrator  notwithstanding  that such  individuals or any of them
have ceased to hold such  offices  prior to the  authentication  and delivery of
such Certificates or did not hold such offices at the date of such Certificates.
No  Certificate  shall be entitled to any benefit  under this  Agreement,  or be
valid for any purpose, unless manually countersigned by a Responsible Officer of
the  Trust  Administrator,  or  unless  there  appears  on  such  Certificate  a
certificate of  authentication  executed by the  Authenticating  Agent by manual
signature,  and such countersignature or certificate upon a 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.

            Until such time as Definitive  Certificates  are issued  pursuant to
Section 5.07, each Book-Entry Certificate shall bear the following legend:

            "Unless   this   certificate   is   presented   by   an   authorized
      representative  of [the  Clearing  Agency]  to the Seller 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],  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."

            (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 Seller.  Such Certificates  shall initially be registered in the Certificate
Register  in the name of the  nominee of the  initial  Clearing  Agency,  and no
Beneficial  Owner  will  receive  a  definitive  certificate  representing  such
Beneficial Owner's interest in the Book-Entry  Certificates,  except as provided
in Section 5.07.  Unless and until  definitive,  fully  registered  certificates
("Definitive  Certificates")  have been issued to Beneficial  Owners pursuant to
Section 5.07:

            (i) the provisions  of this Section  5.01(b) shall be in full force
and effect;

            (ii) the Seller, the Master Servicer,  the Certificate Registrar and
the Trust  Administrator  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  5.01(b)
conflict with any other  provisions of this  Agreement,  the  provisions of this
Section 5.01(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 initial Clearing Agency will 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.

            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 5.07, copies of the reports or statements
referred to in Section 4.04 shall be available to Beneficial Owners upon written
request to the Trust Administrator at the Corporate Trust Office.

            SECTION 5.02      REGISTRATION OF CERTIFICATES.

            (a) The  Trust  Administrator  shall  cause to be kept at one of the
offices or  agencies to be  maintained  in  accordance  with the  provisions  of
Section  5.06 a  Certificate  Register  in  which,  subject  to such  reasonable
regulations as it may prescribe,  the Trust  Administrator shall provide for the
registration of  Certificates  and of transfers and exchanges of Certificates as
herein  provided.  The Trust  Administrator  shall act as, or shall  appoint,  a
Certificate Registrar for the purpose of registering  Certificates and transfers
and exchanges of Certificates as herein provided.

            Upon surrender for  registration  of transfer of any  Certificate at
any office or agency  maintained for such purpose  pursuant to Section 5.06 (and
subject to the  provisions of this Section 5.02) the Trust  Administrator  shall
execute,  and shall date,  authenticate  (or cause the  Authenticating  Agent to
authenticate)  and  deliver,  in  the  name  of  the  designated  transferee  or
transferees,  one or more new Certificates of a like aggregate principal portion
or Percentage Interest and of the same Class.

            At  the  option  of  the  Certificateholders,  Certificates  may  be
exchanged for other Certificates of authorized Denominations of a like aggregate
principal portion or Percentage Interest and of the same Class upon surrender of
the  Certificates  to be  exchanged  at any such office or agency.  Whenever any
Certificates  are so surrendered  for exchange,  the Trust  Administrator  shall
execute,  and shall date,  authenticate  (or cause the  Authenticating  Agent to
authenticate) and deliver, the Certificates which the  Certificateholder  making
the exchange is entitled to receive.  Every Certificate presented or surrendered
for transfer or exchange shall (if so required by the  Certificate  Registrar or
the Trust  Administrator)  be duly endorsed by, or be  accompanied  by a written
instrument of transfer in form satisfactory to the Certificate  Registrar,  duly
executed by the Holder thereof or his attorney duly authorized in writing.

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

            All  Certificates  surrendered  for transfer  and exchange  shall be
canceled  by  the  Certificate   Registrar,   the  Trust  Administrator  or  the
Authenticating Agent in accordance with their standard procedures.

            (b) No transfer of a Class A-PO,  Class B-4,  Class B-5 or Class B-6
Certificate shall be made unless the registration requirements of the Securities
Act of 1933, as amended,  and any applicable  State securities laws are complied
with, or such transfer is exempt from the registration  requirements  under said
Act and laws.  In the event that a transfer  is to be made in  reliance  upon an
exemption from said Act or laws, (i) unless such transfer is made in reliance on
Rule 144A, the Trust  Administrator or the Seller may, if such transfer is to be
made within  three years after the later of (i) the date of the initial  sale of
Certificates or (ii) the last date on which the Seller or any affiliate  thereof
was a Holder of the  Certificates  proposed to be  transferred,  require a Class
A-PO, Class B-4, Class B-5 or Class B-6  Certificateholder  to deliver a written
Opinion of Counsel  acceptable to and in form and substance  satisfactory to the
Trust Administrator and the Seller, to the effect that such transfer may be made
pursuant to an  exemption,  describing  the  applicable  exemption and the basis
therefor, from said Act and laws or is being made pursuant to said Act and laws,
which Opinion of Counsel shall not be an expense of the Trust Administrator, the
Trustee,  the Seller or the Master  Servicer,  and (ii) the Trust  Administrator
shall  require  the  transferee  (other than an  affiliate  of the Seller on the
Closing  Date) to execute an  investment  letter in the form of Exhibit J hereto
certifying to the Seller and the Trust  Administrator the facts surrounding such
transfer,  which  investment  letter  shall  not  be an  expense  of  the  Trust
Administrator,  the Trustee, the Seller or the Master Servicer.  The Holder of a
Class A-PO,  Class B-4,  Class B-5 or Class B-6  Certificate  desiring to effect
such   transfer   shall,   and  does  hereby  agree  to,   indemnify  the  Trust
Administrator, the Trustee, the Seller, the Master Servicer and any Paying Agent
acting on behalf of the  Trustee  against any  liability  that may result if the
transfer  is not so exempt or is not made in  accordance  with such  federal and
state  laws.  Neither  the  Seller  nor the  Trust  Administrator  is  under  an
obligation  to  register  the  Class  A-PO,  Class  B-4,  Class B-5 or Class B-6
Certificates under said Act or any other securities law.

            (c) No transfer of a Class A-PO or Class B Certificate shall be made
(other than the transfer of the Class A-PO  Certificates  to an affiliate of the
Seller on the Closing Date) unless the Trust  Administrator and the Seller shall
have  received (i) a  representation  letter from the  transferee in the form of
Exhibit J hereto, in the case of a Class A-PO, Class B-4, Class B-5 or Class B-6
Certificate,  or in the form of  Exhibit K hereto,  in the case of a Class  B-1,
Class  B-2 or  Class  B-3  Certificate,  to the  effect  that  either  (a)  such
transferee  is not an  employee  benefit  plan or other  retirement  arrangement
subject to Title I of ERISA or Code Section  4975,  or a  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")  and is not a person
acting on behalf of or using the assets of any such Plan,  which  representation
letter  shall not be an expense of the Trust  Administrator,  the  Trustee,  the
Seller or the Master  Servicer or (b) with  respect to the Class B  Certificates
only, if such transferee is an insurance  company,  (A) the source of funds used
to purchase the Class B 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)), (B) 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  exceeds 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  and (C) the purchase and holding of such Class B  Certificates  are
covered by Sections I and III of PTE 95-60 or (ii) in the case of any such Class
A-PO or Class B Certificate presented for registration in the name of a Plan, or
a trustee of any such Plan, (A) an Opinion of Counsel  satisfactory to the Trust
Administrator  and the Seller to the effect that the purchase or holding of such
Class  A-PO or Class B  Certificate  will not  result in the assets of the Trust
Estate  being  deemed  to  be  "plan  assets"  and  subject  to  the  prohibited
transaction  provisions  of ERISA,  the Code or Similar Law and will not subject
the Trust  Administrator,  the Trustee, the Seller or the Master Servicer to any
obligation in addition to those  undertaken in this Agreement,  which Opinion of
Counsel  shall not be an expense of the Trust  Administrator,  the Trustee,  the
Seller or the Master Servicer and (B) such other opinions of counsel,  officer's
certificates  and agreements as the Seller or the Master Servicer may require in
connection with such transfer, which opinions of counsel, officers' certificates
and agreements shall not be an expense of the Trust Administrator,  the Trustee,
the Seller or the Master Servicer. The Class A-PO and Class B 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  A-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 acting on behalf of or 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  A-R
Certificate  in  connection  with the conduct of a trade or business  within the
United States and has furnished the transferor and the Trust  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 Trust Administrator an opinion
of a  nationally  recognized  tax counsel to the effect that the transfer of the
Class A-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
A-R  Certificate  will 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  Foreign Holder"), and any such purported
transfer  shall be void and have no effect.  The Trust  Administrator  shall not
execute,  and shall not  authenticate  (or  cause  the  Authenticating  Agent to
authenticate)  and deliver,  a new Class A-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   Certificate   Registrar  nor  the  Trust
Administrator shall accept a surrender for transfer or registration of transfer,
or register the transfer of, the Class A-R  Certificate,  unless the  transferor
shall have provided to the Trust  Administrator  an affidavit,  substantially in
the form attached as Exhibit H hereto,  signed by the 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 A-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  will
not  transfer  the Class A-R  Certificate  to any Person who does not provide an
affidavit substantially in the form attached as Exhibit H hereto.

            The affidavit described in the preceding paragraph,  if not executed
in connection with the initial issuance of the Class A-R  Certificate,  shall be
accompanied  by a written  statement  in the form  attached as Exhibit I 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 A-R  Certificate  shall bear a legend  referring to the
foregoing restrictions contained in this paragraph and the preceding paragraph.

            Upon  notice to the  Master  Servicer  that any legal or  beneficial
interest  in any  portion  of the Class A-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  A-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 the Class A-R  Certificate  as  completely  as if such
transfer had never  occurred,  provided that the Master Servicer may, but is not
required to, recover any  distributions  made to such transferee with respect to
the Class A-R Certificate, and (ii) the Master Servicer agrees to furnish to the
Internal  Revenue  Service and to any transferor of the Class A-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 A-R Certificate
(or portion  thereof) for periods  after such  transfer.  At the election of the
Master  Servicer,  the cost to the Master  Servicer of computing and  furnishing
such  information  may be charged to the  transferor  or such agent  referred to
above; however, the Master Servicer shall in no event be excused from furnishing
such information.

            SECTION 5.03      MUTILATED,    DESTROYED,   LOST   OR   STOLEN
CERTIFICATES.

            If (i)  any  mutilated  Certificate  is  surrendered  to  the  Trust
Administrator  or the  Authenticating  Agent, or the Trust  Administrator or the
Authenticating  Agent receives  evidence to its satisfaction of the destruction,
loss or theft of any  Certificate,  and (ii)  there is  delivered  to the  Trust
Administrator or the  Authenticating  Agent such security or indemnity as may be
required by them to hold each of them  harmless,  then, in the absence of notice
to the Trust Administrator or the Authenticating Agent that such Certificate has
been acquired by a bona fide purchaser,  the Trust  Administrator  shall execute
and  authenticate  (or  cause  the  Authenticating  Agent to  authenticate)  and
deliver,  in exchange for or in lieu of any such mutilated,  destroyed,  lost or
stolen  Certificate,  a new  Certificate of like tenor and principal  portion or
Percentage  Interest  and of the  same  Class.  Upon  the  issuance  of any  new
Certificate  under this  Section,  the Trust  Administrator  or the  Certificate
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
expense  (including  the fees and  expenses  of the Trust  Administrator  or the
Authenticating Agent) in connection therewith.  Any duplicate Certificate issued
pursuant to this Section shall constitute complete and indefeasible  evidence of
ownership in the Trust Estate, as if originally issued, whether or not the lost,
stolen, or destroyed Certificate shall be found at any time.

            SECTION 5.04      PERSONS DEEMED OWNERS.

            Prior to the due  presentation of a Certificate for  registration of
transfer, the Seller, the Master Servicer, the Trustee, the Trust Administrator,
the Certificate Registrar and any agent of the Seller, the Master Servicer,  the
Trustee,  the Trust  Administrator  or the  Certificate  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 4.01,
and for all other  purposes  whatsoever,  and  neither  the  Seller,  the Master
Servicer,  the Trustee, the Trust Administrator,  the Certificate  Registrar nor
any  agent  of  the  Seller,  the  Master  Servicer,   the  Trustee,  the  Trust
Administrator  or the  Certificate  Registrar shall be affected by notice to the
contrary.

            SECTION 5.05      ACCESS TO LIST OF CERTIFICATEHOLDERS' NAMES AND
ADDRESSES.

            (a)  If  the  Trust  Administrator  is  not  acting  as  Certificate
Registrar,  the Certificate  Registrar shall furnish or cause to be furnished to
the  Trust  Administrator,  within  15 days  after  receipt  by the  Certificate
Registrar of a request by the Trust  Administrator  in writing,  a list, in such
form as the  Trust  Administrator  may  reasonably  require,  of the  names  and
addresses of the  Certificateholders  of each Class as of the most recent Record
Date.

            (b) If five or more  Certificateholders  (hereinafter referred to as
"applicants") apply in writing to the Trust Administrator,  and such application
states that the applicants  desire to communicate with other  Certificateholders
with respect to their rights under this Agreement or under the  Certificates and
is accompanied by a copy of the communication  which such applicants  propose to
transmit,  then  the  Trust  Administrator  shall,  within  five  Business  Days
following the receipt of such application,  afford such applicants access during
normal business hours to the most recent list of Certificateholders  held by the
Trust Administrator. If such a list is as of the date more than 90 days prior to
the date of receipt of such applicants'  request and the Trust  Administrator is
not the Certificate  Registrar,  the Trust  Administrator shall promptly request
from the  Certificate  Registrar a current  list as provided  in  paragraph  (a)
hereof,  and shall  afford such  applicants  access to such list  promptly  upon
receipt.

            (c) Every Certificateholder, by receiving and holding a Certificate,
agrees with the Seller,  the Master  Servicer,  the Certificate  Registrar,  the
Trust  Administrator  and the  Trustee  that  neither  the  Seller,  the  Master
Servicer,  the Certificate  Registrar,  the Trust  Administrator nor the Trustee
shall be held accountable by reason of the disclosure of any such information as
to the names,  addresses  and  Percentage  Interests  of the  Certificateholders
hereunder, regardless of the source from which such information was delivered.

            SECTION 5.06      MAINTENANCE OF OFFICE OR AGENCY.

            The Trust Administrator will maintain,  at its expense, an office or
agency where  Certificates  may be surrendered  for  registration of transfer or
exchange and where notices and demands to or upon the  Certificate  Registrar in
respect  of the  Certificates  and  this  Agreement  may be  served.  The  Trust
Administrator  initially designates the Corporate Trust Office and the principal
corporate trust office of the  Authenticating  Agent, if any, as its offices and
agencies for said purposes.

            SECTION 5.07      DEFINITIVE CERTIFICATES.

            If (i)(A) the Master  Servicer  advises the Trust  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  Master  Servicer  is unable  to  locate a  qualified
successor,   (ii)  the  Master  Servicer,  at  its  option,  advises  the  Trust
Administrator  in writing  that it elects to  terminate  the  book-entry  system
through  the  Clearing  Agency,  (iii)  after the  occurrence  of  dismissal  or
resignation of the Master Servicer,  Beneficial  Owners  representing  aggregate
Voting  Interests of not less than 51% of the aggregate Voting Interests of each
outstanding  Class of  Book-Entry  Certificates  advise the Trust  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 or (iv) upon the occurrence of the
events specified in Section 4.07(g),  the Trust  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 Trust  Administrator  by the Clearing
Agency  of the  Certificates  held of  record  by its  nominee,  accompanied  by
reregistration  instructions  and  directions  to execute and  authenticate  new
Certificates from the Master Servicer, the Trust Administrator shall execute and
authenticate Definitive Certificates for delivery at its Corporate Trust Office.
The Master  Servicer shall arrange for, and will bear all costs of, the printing
and issuance of such  Definitive  Certificates.  Neither the Seller,  the Master
Servicer,  the Trustee nor the Trust Administrator 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 5.08      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
5.07,  the Trust  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 VI

                       THE SELLER AND THE MASTER SERVICER

            SECTION 6.01      LIABILITY OF THE SELLER AND THE MASTER SERVICER.

            The  Seller  and  the  Master  Servicer  shall  each  be  liable  in
accordance herewith only to the extent of the obligations  specifically  imposed
by this  Agreement  and  undertaken  hereunder  by the  Seller  and  the  Master
Servicer.

            SECTION 6.02      MERGER OR  CONSOLIDATION  OF THE  SELLER OR THE

MASTER SERVICER.

            Subject  to the  following  paragraph,  the  Seller  and the  Master
Servicer each will keep in full effect its existence, rights and franchises as a
corporation  under the laws of the jurisdiction of its  incorporation,  and will
obtain and preserve its qualification to do business as a foreign corporation in
each  jurisdiction  in which  such  qualification  is or shall be  necessary  to
protect the validity and  enforceability of this Agreement,  the Certificates or
any of the  Mortgage  Loans and to  perform  its  respective  duties  under this
Agreement.

            The Seller or the Master Servicer may be merged or consolidated with
or into any Person,  or transfer all or  substantially  all of its assets to any
Person,  in which case any Person  resulting from any merger or consolidation to
which the Seller or Master Servicer shall be a party,  or any Person  succeeding
to the business of the Seller or Master Servicer,  shall be the successor of the
Seller or Master  Servicer  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, in the case of
the Master  Servicer,  any such successor or resulting Person shall be qualified
to service mortgage loans for FNMA or FHLMC.

            SECTION 6.03      LIMITATION  ON  LIABILITY  OF THE  SELLER,  THE
MASTER SERVICER AND OTHERS.

            Neither the Seller nor the Master Servicer nor any subcontractor nor
any of the  partners,  directors,  officers,  employees or agents of any of them
shall be under any liability to the Trust Estate or the  Certificateholders  and
all such Persons shall be held  harmless for any action taken or for  refraining
from the taking of any action in good faith pursuant to this  Agreement,  or for
errors in judgment; provided, however, that this provision shall not protect any
such Person against any breach of warranties or  representations  made herein or
against  any  liability  which would  otherwise  be imposed by reason of willful
misfeasance,  bad faith or gross  negligence in the  performance of duties or by
reason of reckless  disregard of obligations and duties  hereunder.  The Seller,
the Master Servicer,  any  subcontractor,  and any partner,  director,  officer,
employee  or agent of any of them shall be entitled  to  indemnification  by the
Trust Estate and will be held  harmless  against any loss,  liability or expense
incurred in connection  with any legal action  relating to this Agreement or the
Certificates,  other than any loss,  liability or expense  incurred by reason of
willful misfeasance,  bad faith or gross negligence in the performance of his or
its  duties  hereunder  or by  reason  of  reckless  disregard  of  his  or  its
obligations and duties hereunder. The Seller, the Master Servicer and any of the
directors, officers, employees or agents of either may rely in good faith on any
document of any kind which,  prima facie, is properly  executed and submitted by
any Person respecting any matters arising hereunder.  Neither the Seller nor the
Master Servicer shall be under any obligation to appear in,  prosecute or defend
any legal action  unless such action is related to its  respective  duties under
this  Agreement  and which in its opinion  does not involve it in any expense or
liability;  provided, however, that the Seller or the Master Servicer may in its
discretion  undertake  any such action which it may deem  necessary or desirable
with respect to this  Agreement and the rights and duties of the parties  hereto
and the interests of the Certificateholders  hereunder if the Certificateholders
offer to the  Seller  or the  Master  Servicer,  as the case may be,  reasonable
security or indemnity  against the costs,  expenses and liabilities which may be
incurred therein or thereby. In such event, the legal expenses and costs of such
action  and any  liability  resulting  therefrom  shall be  expenses,  costs and
liabilities of the Trust Estate,  and the Seller or the Master Servicer shall be
entitled to be  reimbursed  therefor out of the  Certificate  Account,  and such
amounts shall,  on the following  Distribution  Date or  Distribution  Dates, be
allocated in reduction of  distributions on the Class A and Class B Certificates
in the same manner as Realized Losses are allocated pursuant to Section 4.02(a).

            SECTION 6.04      RESIGNATION OF THE MASTER SERVICER.

            The Master Servicer shall not resign from the obligations and duties
hereby imposed on it except upon  determination that its duties hereunder are no
longer permissible under applicable law or are in material conflict by reason of
applicable  law  with  any  other   activities   carried  on  by  it.  Any  such
determination  permitting  the  resignation  of the  Master  Servicer  shall  be
evidenced  by an Opinion of Counsel to such effect  delivered to the Trustee and
the Trust Administrator,  a copy of which shall be delivered, but not addressed,
to Ambac. No such  resignation  shall become  effective  until the Trustee,  the
Trust  Administrator  or a  successor  servicer  shall have  assumed  the Master
Servicer's responsibilities, duties, liabilities and obligations hereunder.

            SECTION 6.05      COMPENSATION TO THE MASTER SERVICER.

            The Master Servicer shall be entitled to receive a monthly fee equal
to the Master Servicing Fee, as compensation for services rendered by the Master
Servicer under this Agreement.  The Master Servicer also will be entitled to any
late reporting fees paid by a Servicer  pursuant to its Servicing  Agreement and
any  investment  income  on funds  on  deposit  in the  Certificate  Account  as
additional compensation.

            SECTION 6.06      ASSIGNMENT  OR  DELEGATION  OF DUTIES BY MASTER
SERVICER.

            The Master  Servicer shall not assign or transfer any of its rights,
benefits or privileges under this Agreement to any other Person,  or delegate to
or subcontract  with, or authorize or appoint any other Person to perform any of
the duties,  covenants or  obligations  to be  performed by the Master  Servicer
without the prior  written  consent of the Trustee and the Trust  Administrator,
and any agreement,  instrument or act purporting to effect any such  assignment,
transfer,   delegation  or  appointment  shall  be  void.   Notwithstanding  the
foregoing,  the Master  Servicer  shall have the right without the prior written
consent of the Trustee or the Trust  Administrator  (i) to assign its rights and
delegate its duties and obligations hereunder;  provided,  however, that (a) the
purchaser or transferee  accepting such assignment or delegation is qualified to
service mortgage loans for FNMA or FHLMC, is satisfactory to the Trustee and the
Trust Administrator,  in the exercise of its reasonable  judgment,  and executes
and delivers to the Trustee and the Trust  Administrator  an agreement,  in form
and   substance   reasonably   satisfactory   to  the   Trustee  and  the  Trust
Administrator,  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 Master Servicer  hereunder from and after the
date of such agreement;  and (b) each  applicable  Rating Agency's rating of any
Certificates in effect immediately prior to such assignment, sale or transfer is
not  reasonably  likely to be qualified,  downgraded or withdrawn as a result of
such assignment, sale or transfer and the Certificates are not reasonably likely
to be placed on credit review status by any such Rating Agency (without,  in the
case of the Class A-3  Certificates,  giving effect to the guaranty  provided by
Ambac);  and (ii) to delegate to,  subcontract  with,  authorize,  or appoint an
affiliate of the Master Servicer to perform and carry out any duties,  covenants
or obligations to be performed and carried out by the Master Servicer under this
Agreement and hereby agrees so to delegate, subcontract, authorize or appoint to
an affiliate of the Master  Servicer any duties,  covenants or obligations to be
performed and carried out by the Master Servicer to the extent that such duties,
covenants or obligations are to be performed in any state or states in which the
Master Servicer is not authorized to do business as a foreign corporation but in
which the affiliate is so authorized.  In no case, however,  shall any permitted
assignment  and delegation  relieve the Master  Servicer of any liability to the
Trustee, Trust Administrator or the Seller under this Agreement,  incurred by it
prior to the time that the conditions contained in clause (i) above are met.

            SECTION 6.07      INDEMNIFICATION OF TRUSTEE, TRUST ADMINISTRATOR
AND SELLER BY MASTER SERVICER.

            The Master  Servicer shall  indemnify and hold harmless the Trustee,
the Trust  Administrator  and the  Seller  and any  director,  officer  or agent
thereof against any loss, liability or expense,  including reasonable attorney's
fees,  arising  out of, in  connection  with or  incurred  by reason of  willful
misfeasance,  bad faith or negligence in the performance of duties of the Master
Servicer  under  this  Agreement  or by  reason  of  reckless  disregard  of its
obligations  and duties  under this  Agreement.  Any  payment  pursuant  to this
Section made by the Master Servicer to the Trustee,  the Trust  Administrator or
the  Seller  shall  be from  such  entity's  own  funds,  without  reimbursement
therefor.  The provisions of this Section 6.07 shall survive the  termination of
this Agreement.

            SECTION 6.08      MASTER SERVICER COVENANTS  CONCERNING YEAR 2000

COMPLIANCE.

            The  Master  Servicer  covenants  that it is  working  to modify its
computer  and other  systems  used in the  performance  of its  duties as Master
Servicer  for the  Certificates  to operate in a manner such that,  on and after
January 1, 2000, the Master  Servicer can perform its duties in accordance  with
the terms of this Agreement.


<PAGE>







                                   ARTICLE VII

                                     DEFAULT

            SECTION 7.01      EVENTS OF DEFAULT.

            In case one or more of the following Events of Default by the Master
Servicer shall occur and be continuing, that is to say:

            (i) any failure by the Master Servicer (a) to remit any funds to the
Paying  Agent as required by Section  4.03 or (b) to  distribute  or cause to be
distributed to Certificateholders  any payment required to be made by the Master
Servicer  under the terms of this  Agreement  which,  in either case,  continues
unremedied for a period of three business days after the date upon which written
notice of such failure, requiring the same to be remedied, shall have been given
to the Master  Servicer by the Trustee or to the Master Servicer and the Trustee
by the holders of Certificates  evidencing in the aggregate not less than 25% of
the aggregate Voting Interest represented by all Certificates; or

            (ii) any failure on the part of the Master  Servicer duly to observe
or perform in any material  respect any other of the  covenants or agreements on
the part of the Master  Servicer in the  Certificates or in this Agreement which
continues  unremedied  for a period of 60 days  after the date on which  written
notice of such failure, requiring the same to be remedied, shall have been given
to the Master Servicer by the Trustee, or to the Master Servicer and the Trustee
by the holders of Certificates  evidencing in the aggregate not less than 25% of
the aggregate Voting Interest represented by all Certificates; or

            (iii)  a  decree  or  order  of a court  or  agency  or  supervisory
authority having  jurisdiction in the premises for the appointment of a trustee,
conservator, receiver or liquidator in any bankruptcy, insolvency,  readjustment
of debt, marshaling of assets and liabilities or similar proceedings, or for the
winding-up or  liquidation of its affairs,  shall have been entered  against the
Master  Servicer  and  such  decree  or  order  shall  have  remained  in  force
undischarged and unstayed for a period of 60 days; or

            (iv) the  Master  Servicer  shall  consent to the  appointment  of a
trustee,  conservator,  receiver or liquidator or  liquidating  committee in any
bankruptcy,   insolvency,   readjustment  of  debt,  marshaling  of  assets  and
liabilities,  voluntary liquidation or similar proceedings of or relating to the
Master Servicer,  or of or relating to all or substantially all of its property;
or

            (v)  the Master Servicer shall admit in writing its inability to pay
its debts generally as they become due, file a petition to take advantage of any
applicable insolvency,  bankruptcy or reorganization statute, make an assignment
for  the  benefit  of  its  creditors  or  voluntarily  suspend  payment  of its
obligations;

            (vi) the Master Servicer shall be dissolved, or shall dispose of all
or  substantially  all of its assets;  or consolidate with or merge into another
entity or shall permit another entity to consolidate or merge into it, such that
the  resulting  entity does not meet the criteria for a successor  servicer,  as
specified in Section 6.02 hereof; or

            (vii)  the  Master  Servicer  and any  subservicer  appointed  by it
becomes  ineligible  to  service  for both FNMA and FHLMC,  which  ineligibility
continues unremedied for a period of 90 days.

then, and in each and every such case,  subject to applicable law, so long as an
Event of Default shall not have been remedied, either the Trustee or the holders
of  Certificates  evidencing  in the  aggregate  not  less  than  66 2/3% of the
aggregate Voting Interest represented by all Certificates,  by notice in writing
to the Master Servicer and the Trust  Administrator (and to the Trustee if given
by the  Certificateholders)  may terminate all of the rights and  obligations of
the Master Servicer under this Agreement and in and to the Mortgage  Loans,  but
without  prejudice  to any  rights  which the  Master  Servicer  may have to the
aggregate  Master Servicing Fees due prior to the date of transfer of the Master
Servicer's responsibilities  hereunder,  reimbursement of expenses to the extent
permitted by this  Agreement,  Periodic  Advances and other  advances of its own
funds. Upon receipt by the Master Servicer of such written notice, all authority
and power of the Master Servicer under this  Agreement,  whether with respect to
the Certificates or the Mortgage Loans or otherwise, shall pass to and be vested
in the Trust  Administrator  on behalf of the Trustee pursuant to and under this
Section, subject to the provisions of Section 7.05; and, without limitation, the
Trust  Administrator on behalf of the Trustee is hereby authorized and empowered
to execute and deliver, on behalf of the Master Servicer, as attorney-in-fact or
otherwise, any and all documents and other instruments,  and to do or accomplish
all other acts or things necessary or appropriate to effect the purposes of such
notice of  termination,  whether to complete  the transfer  and  endorsement  or
assignment of the Mortgage Loans and related documents or otherwise.  The Master
Servicer  agrees to cooperate  with the Trust  Administrator  and the Trustee in
effecting the termination of the Master Servicer's  responsibilities  and rights
hereunder  and shall  promptly  provide the Trustee  all  documents  and records
reasonably  requested  by it  to  enable  it to  assume  the  Master  Servicer's
functions  hereunder and shall promptly also transfer to the Trust Administrator
on behalf of the Trustee  all  amounts  which then have been or should have been
deposited  in the  Certificate  Account  by the  Master  Servicer  or which  are
thereafter received by the Master Servicer with respect to the Mortgage Loans.

            SECTION 7.02      OTHER REMEDIES OF TRUSTEE.

            During  the  continuance  of any Event of  Default,  so long as such
Event of Default shall not have been remedied,  the Trustee,  in addition to the
rights  specified  in Section  7.01,  shall  have the right,  in its own name as
trustee of an express  trust,  to take all actions now or hereafter  existing at
law, in equity or by statute to enforce its rights and  remedies  and to protect
the interests,  and enforce the rights and remedies,  of the  Certificateholders
(including the institution and prosecution of all judicial,  administrative  and
other  proceedings  and the  filing of  proofs  of claim and debt in  connection
therewith).  Except as otherwise expressly provided in this Agreement, no remedy
provided for by this Agreement shall be exclusive of any other remedy,  and each
and every remedy shall be cumulative  and in addition to any other remedy and no
delay or omission to exercise any right or remedy shall impair any such right or
remedy or shall be deemed to be a waiver of any Event of Default.

            SECTION 7.03      DIRECTIONS BY CERTIFICATEHOLDERS  AND DUTIES OF
TRUSTEE DURING EVENT OF DEFAULT.

            During  the  continuance  of  any  Event  of  Default,   Holders  of
Certificates  evidencing  in the  aggregate  not less than 25% of the  aggregate
Voting Interest  represented by all Certificates may direct the time, method and
place of conducting any proceeding for any remedy  available to the Trustee,  or
exercising any trust or power conferred upon the Trustee,  under this Agreement;
provided,  however,  that the Trustee shall be under no obligation to pursue any
such  remedy,  or to exercise  any of the rights or powers  vested in it by this
agreement (including, without limitation, (i) the conducting or defending of any
administrative action or litigation hereunder or in relation hereto and (ii) the
terminating  of the Master  Servicer  from its  rights  and  duties as  servicer
hereunder) at the request, order or direction of any of the  Certificateholders,
unless such  Certificateholders  shall have  offered to the  Trustee  reasonable
security or indemnity  against the cost,  expenses and liabilities  which may be
incurred  therein  or  thereby  and,  provided  further,  that,  subject  to the
provisions  of  Section  8.01,  the  Trustee  shall have the right to decline to
follow any such  direction  if the  Trustee,  in  accordance  with an Opinion of
Counsel,  determines  that the action or proceeding so directed may not lawfully
be  taken  or if the  Trustee  in good  faith  determines  that  the  action  or
proceeding  so directed  would  involve it in personal  liability or be unjustly
prejudicial to the nonassenting Certificateholders.

            SECTION 7.04      ACTION  UPON  CERTAIN  FAILURES  OF THE  MASTER
SERVICER AND UPON EVENT OF DEFAULT.

            In the event that the Trustee or the Trust  Administrator shall have
knowledge of any failure of the Master Servicer  specified in Section 7.01(i) or
(ii) which would become an Event of Default upon the Master  Servicer's  failure
to remedy the same after notice, the Trustee or the Trust Administrator may, but
need not if the Trustee or the Trust Administrator, as the case may be, deems it
not in the Certificateholders'  best interest, give notice thereof to the Master
Servicer. For all purposes of this Agreement, in the absence of actual knowledge
by a  corporate  trust  officer of the Trustee or the Trust  Administrator,  the
Trustee or the Trust  Administrator,  as the case may be, shall not be deemed to
have  knowledge  of any failure of the Master  Servicer as  specified in Section
7.01(i) and (ii) or any Event of Default unless  notified  thereof in writing by
the Master Servicer or by a Certificateholder.

            SECTION 7.05      TRUST  ADMINISTRATOR  TO  ACT;  APPOINTMENT  OF
SUCCESSOR.

            When the Master Servicer receives notice of termination  pursuant to
Section 7.01 or the Trustee or the Trust Administrator  receives the resignation
of the Master  Servicer  evidenced by an Opinion of Counsel  pursuant to Section
6.04, the Trust Administrator on behalf of the Trustee shall be the successor in
all  respects to the Master  Servicer in its capacity as master  servicer  under
this Agreement and the  transactions  set forth or provided for herein and shall
have the rights and  powers and be subject to all the  responsibilities,  duties
and liabilities  relating thereto placed on the Master Servicer by the terms and
provisions  hereof and in its  capacity  as such  successor  shall have the same
limitation of liability herein granted to the Master Servicer. In the event that
the Trust  Administrator  is  succeeding  to the Master  Servicer  as the Master
Servicer, as compensation therefor, the Trust Administrator shall be entitled to
receive  monthly such portion of the Master  Servicing  Fee,  together with such
other  servicing  compensation  as is  agreed  to at  such  time  by  the  Trust
Administrator  and the Master  Servicer,  but in no event more than 25%  thereof
until the date of final cessation of the Master Servicer's  servicing activities
hereunder.  Notwithstanding  the above, the Trust Administrator may, if it shall
be  unwilling  to so act,  or  shall,  if it is  unable to so act or to obtain a
qualifying  bid as described  below,  appoint,  or petition a court of competent
jurisdiction  to  appoint,  any housing and home  finance  institution,  bank or
mortgage  servicing  institution having a net worth of not less than $10,000,000
and  meeting  such other  standards  for a  successor  servicer as are set forth
herein,  as the successor to the Master Servicer  hereunder in the assumption of
all or any part of the  responsibilities,  duties or  liabilities  of the Master
Servicer  hereunder;  provided,  however,  that  until such a  successor  master
servicer  is  appointed  and  has  assumed  the  responsibilities,   duties  and
liabilities of the Master  Servicer  hereunder,  the Trust  Administrator  shall
continue  as the  successor  to the  Master  Servicer  as  provided  above.  The
compensation of any successor  master servicer so appointed shall not exceed the
compensation   specified  in  Section  6.05  hereof.  In  the  event  the  Trust
Administrator  is  required  to  solicit  bids  as  provided  above,  the  Trust
Administrator shall solicit, by public announcement,  bids from housing and home
finance  institutions,  banks and mortgage  servicing  institutions  meeting the
qualifications  set forth in the  preceding  sentence  for the  purchase  of the
master  servicing  functions.  Such public  announcement  shall specify that the
successor  master  servicer  shall be  entitled to the full amount of the Master
Servicing Fee as compensation together with the other servicing  compensation in
the form of late reporting fees or otherwise as provided in Section 6.05. Within
30 days  after  any such  public  announcement,  the Trust  Administrator  shall
negotiate and effect the sale,  transfer and assignment of the master  servicing
rights and  responsibilities  hereunder to the qualified  party  submitting  the
highest  qualifying  bid.  The Trust  Administrator  shall  deduct all costs and
expenses of any public  announcement and of any sale, transfer and assignment of
the servicing rights and responsibilities hereunder from any sum received by the
Trust Administrator from the successor to the Master Servicer in respect of such
sale, transfer and assignment.  After such deductions, the remainder of such sum
shall be paid by the Trust  Administrator  to the Master Servicer at the time of
such sale, transfer and assignment to the Master Servicer's successor. The Trust
Administrator  and such successor  shall take such action,  consistent with this
Agreement,  as shall be necessary to effectuate any such succession.  The Master
Servicer  agrees to cooperate  with the Trust  Administrator  and any  successor
servicer  in  effecting  the  termination  of the  Master  Servicer's  servicing
responsibilities  and rights  hereunder  and shall  promptly  provide  the Trust
Administrator or such successor master  servicer,  as applicable,  all documents
and  records  reasonably  requested  by it to  enable it to  assume  the  Master
Servicer's  function  hereunder  and shall  promptly  also transfer to the Trust
Administrator  or such successor  master  servicer,  as applicable,  all amounts
which then have been or should have been deposited in the Certificate Account by
the Master Servicer or which are thereafter received by the Master Servicer with
respect to the Mortgage  Loans.  Neither the Trust  Administrator  nor any other
successor  master servicer shall be deemed to be in default  hereunder by reason
of any failure to make, or any delay in making,  any  distribution  hereunder or
any portion thereof caused by (i) the failure of the Master Servicer to deliver,
or  any  delay  in  delivering,  cash,  documents  or  records  to it,  or  (ii)
restrictions  imposed by any regulatory  authority having  jurisdiction over the
Master Servicer.  Notwithstanding  anything to the contrary contained in Section
7.01 above or this Section  7.05,  the Master  Servicer  shall retain all of its
rights and  responsibilities  hereunder,  and no successor  (including the Trust
Administrator)  shall  succeed  thereto,  if  the  assumption  thereof  by  such
successor  would cause the rating  assigned to any  Certificates  to be revoked,
downgraded or placed on credit review status (other than for possible upgrading)
(without,  in the case of the  Class  A-3  Certificates,  giving  effect  to the
guaranty provided by Ambac) by either Rating Agency and the retention thereof by
the Master Servicer would avert such revocation, downgrading or review.

            SECTION 7.06      NOTIFICATION TO CERTIFICATEHOLDERS.

            Upon any  termination  of the Master  Servicer or  appointment  of a
successor  master  servicer,   in  each  case  as  provided  herein,  the  Trust
Administrator shall give prompt written notice thereof to  Certificateholders at
their  respective  addresses  appearing in the Certificate  Register.  The Trust
Administrator  shall also,  within 45 days after the  occurrence of any Event of
Default  known to the  Trust  Administrator,  give  written  notice  thereof  to
Certificateholders  at their respective  addresses  appearing in the Certificate
Register,  unless such Event of Default  shall have been cured or waived  within
said 45-day period.


<PAGE>







                                  ARTICLE VIII

              CONCERNING THE TRUSTEE AND THE TRUST ADMINISTRATOR

            SECTION 8.01      DUTIES OF TRUSTEE AND THE TRUST ADMINISTRATOR.

            The Trustee and the Trust Administrator,  prior to the occurrence of
an Event of Default and after the curing of all Events of Default which may have
occurred,  undertakes  to  perform  such  duties  and only  such  duties  as are
specifically  set  forth in this  Agreement.  In case an Event  of  Default  has
occurred  (which has not been cured),  the Trustee and the Trust  Administrator,
subject to the provisions of Sections 7.01,  7.03, 7.04 and 7.05, shall exercise
such of the rights and powers vested in it by this  Agreement,  and use the same
degree of care and skill in its exercise as a prudent investor would exercise or
use under the circumstances in the conduct of such investor's own affairs.

            The  Trustee  and  the  Trust  Administrator,  upon  receipt  of all
resolutions,  certificates,  statements, opinions, reports, documents, orders or
other instruments  furnished to the Trustee and the Trust  Administrator,  which
are  specifically  required to be  furnished  pursuant to any  provision of this
Agreement, shall examine them to determine whether they are in the form required
by  this  Agreement;   provided,   however,  that  the  Trustee  and  the  Trust
Administrator  shall not be  responsible  for the  accuracy  or  content  of any
certificate,  statement,  instrument, report, notice or other document furnished
by the Master Servicer or the Servicers pursuant to Articles III, IV and IX.

            No  provision  of this  Agreement  shall be construed to relieve the
Trustee and the Trust Administrator from liability for its own negligent action,
its own  negligent  failure  to act or its  own  willful  misconduct;  provided,
however, that:

            (i)  Prior to the  occurrence of an Event of  Default  and after the
curing of all such  Events of Default  which may have  occurred,  the duties and
obligations  of the  Trustee  and the Trust  Administrator  shall be  determined
solely by the express  provisions of this  Agreement,  the Trustee and the Trust
Administrator  shall not be liable except for the performance of such duties and
obligations  as are  specifically  set  forth  in  this  Agreement,  no  implied
covenants or obligations  shall be read into this Agreement  against the Trustee
and the Trust  Administrator and, in the absence of bad faith on the part of the
Trustee and the Trust Administrator, the Trustee and the Trust Administrator may
conclusively  rely, as to the truth of the statements and the correctness of the
opinions expressed  therein,  upon any certificates or opinions furnished to the
Trustee and the Trust Administrator,  and conforming to the requirements of this
Agreement;

            (ii) The Trustee and the Trust Administrator shall not be personally
liable with respect to any action  taken,  suffered or omitted to be taken by it
in good faith in accordance with the direction of holders of Certificates  which
evidence in the aggregate not less than 25% of the Voting  Interest  represented
by all  Certificates  relating to the time,  method and place of conducting  any
proceeding for any remedy available to the Trustee and the Trust  Administrator,
or  exercising  any  trust or power  conferred  upon the  Trustee  and the Trust
Administrator, under this Agreement; and

            (iii) The  Trustee and the Trust  Administrator  shall not be liable
for any  error  of  judgment  made  in good  faith  by any of  their  respective
Responsible  Officers,  unless it shall be proved  that the Trustee or the Trust
Administrator or such Responsible  Officer, as the case may be, was negligent in
ascertaining the pertinent facts.

            None of the provisions contained in this Agreement shall require the
Trustee or the Trust  Administrator to expend or risk its own funds or otherwise
incur  personal  financial  liability  in the  performance  of any of its duties
hereunder  or in the  exercise  of any of its  rights  or  powers  if  there  is
reasonable  ground  for  believing  that  repayment  of such  funds or  adequate
indemnity against such risk or liability is not reasonably assured to it.

            SECTION 8.02      CERTAIN  MATTERS  AFFECTING THE TRUSTEE AND THE
TRUST ADMINISTRATOR.

            Except as otherwise provided in Section 8.01:

            (i) Each of the Trustee and the Trust Administrator may request and
rely and shall be  protected  in  acting  or  refraining  from  acting  upon any
resolution,  Officers'  Certificate,   certificate  of  auditors  or  any  other
certificate,  statement,  instrument, opinion, report, notice, request, consent,
order,  appraisal,  bond or other paper or document believed by it to be genuine
and to have been  signed or  presented  by the proper  party or parties  and the
manner of obtaining  consents and evidencing the  authorization of the execution
thereof shall be subject to such reasonable  regulations as the Trustee or Trust
Administrator, as applicable, may prescribe;

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

            (iii)  Neither of the Trustee nor the Trust  Administrator  shall be
personally liable for any action taken,  suffered or omitted by it in good faith
and believed by it to be authorized or within the discretion or rights or powers
conferred upon it by this Agreement;

            (iv) Subject to Section 7.04, the Trust  Administrator  shall not be
accountable,  shall have no liability and makes no representation as to any acts
or  omissions  hereunder  of the  Master  Servicer  until such time as the Trust
Administrator may be required to act as Master Servicer pursuant to Section 7.05
and  thereupon  only for the acts or  omissions  of the Trust  Administrator  as
successor Master Servicer; and

            (v) Each of the Trustee and the Trust Administrator  may execute any
of the  trusts or powers  hereunder  or  perform  any  duties  hereunder  either
directly or by or through agents or attorneys.

            SECTION 8.03      NEITHER   TRUSTEE  NOR  TRUST   ADMINISTRATOR
REQUIRED TO MAKE INVESTIGATION.

            Prior to the  occurrence of an Event of Default  hereunder and after
the curing of all Events of Default which may have occurred, neither the Trustee
nor the Trust  Administrator  shall be bound to make any investigation  into the
facts or matters stated in any resolution,  certificate,  statement, instrument,
opinion,  report, notice, request,  consent,  order, appraisal,  bond, Mortgage,
Mortgage Note or other paper or document  (provided the same appears  regular on
its face),  unless  requested  in  writing  to do so by holders of  Certificates
evidencing in the aggregate not less than 51% of the Voting Interest represented
by all Certificates;  provided, however, that if the payment within a reasonable
time to the  Trustee  or the  Trust  Administrator  of the  costs,  expenses  or
liabilities  likely to be incurred by it in the making of such investigation is,
in the opinion of the Trustee or the Trust Administrator, not reasonably assured
to the Trustee or the Trust  Administrator by the security afforded to it by the
terms of this  Agreement,  the  Trustee or the Trust  Administrator  may require
reasonable  indemnity  against  such  expense or  liability as a condition to so
proceeding.  The reasonable expense of every such investigation shall be paid by
the Master Servicer or, if paid by the Trustee or the Trust Administrator, shall
be repaid by the Master Servicer upon demand.

            SECTION 8.04      NEITHER TRUSTEE NOR TRUST ADMINISTRATOR  LIABLE
FOR CERTIFICATES OR MORTGAGE LOANS.

            The recitals  contained herein and in the  Certificates  (other than
the certificate of  authentication  on the  Certificates)  shall be taken as the
statements  of the Seller,  and neither the Trustee nor the Trust  Administrator
assumes  responsibility  as to the correctness of the same.  Neither the Trustee
nor the Trust  Administrator makes any representation for the correctness of the
same. Neither the Trustee nor the Trust  Administrator  makes any representation
as to the validity or sufficiency of this Agreement or of the Certificates or of
any Mortgage  Loan or related  document.  Subject to Section  2.04,  neither the
Trustee  nor  the  Trust  Administrator  shall  be  accountable  for  the use or
application by the Seller of any of the  Certificates or of the proceeds of such
Certificates,  or for the use or  application  of any funds  paid to the  Master
Servicer in respect of the Mortgage Loans deposited into the Certificate Account
by the Master  Servicer or, in its capacity as trustee,  for  investment  of any
such amounts.

            SECTION 8.05      TRUSTEE  AND  TRUST   ADMINISTRATOR   MAY  OWN
CERTIFICATES.

            Each of the Trustee,  the Trust Administrator and any agent thereof,
in its  individual  or any other  capacity,  may  become the owner or pledgee of
Certificates  with the same rights it would have if it were not  Trustee,  Trust
Administrator  or such agent and may transact banking and/or trust business with
the Seller, the Master Servicer or their Affiliates.

            SECTION 8.06      THE MASTER SERVICER TO PAY FEES AND EXPENSES.

            The  Master  Servicer  covenants  and  agrees  to pay to each of the
Trustee and the Trust  Administrator  from time to time, and each of the Trustee
and  the  Trust   Administrator   shall  be  entitled  to  receive,   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  rendered by
it in the  execution  of the  trusts  hereby  created  and in the  exercise  and
performance  of any of the  powers and duties  hereunder  of the  Trustee or the
Trust  Administrator,  as the case may be, and the Master  Servicer  will pay or
reimburse the Trustee or the Trust  Administrator,  as the case may be, upon its
request for all reasonable expenses, disbursements and advances incurred or made
by it in accordance with any of the provisions of this Agreement  (including the
reasonable compensation and the expenses and disbursements of its counsel and of
all persons not regularly in its employ) except any such expense,  disbursement,
or advance as may arise from its negligence or bad faith.

            SECTION 8.07      ELIGIBILITY REQUIREMENTS.

            Each of the Trustee and the Trust  Administrator  hereunder shall at
all times (i) be a corporation or association  having its principal  office in a
state and city acceptable to the Seller,  organized and doing business under the
laws of such state or the United States of America,  authorized  under such laws
to exercise corporate trust powers,  having a combined capital and surplus of at
least $50,000,000,  or shall be a member of a bank holding system, the aggregate
combined capital and surplus of which is at least $50,000,000, provided that its
separate capital and surplus shall at all times be at least the amount specified
in Section  310(a)(2)  of the Trust  Indenture  Act of 1939,  (ii) be subject to
supervision or examination by federal or state authority and (iii) have a credit
rating or be otherwise  acceptable  to the Rating  Agencies such that neither of
the Rating  Agencies would reduce their  respective  then current ratings of the
Certificates  (or have provided such security from time to time as is sufficient
to avoid such reduction) as evidenced in writing by each Rating Agency.  If such
corporation or  association  publishes  reports of condition at least  annually,
pursuant to law or to the requirements of the aforesaid supervising or examining
authority,  then for the  purposes  of this  Section  the  combined  capital and
surplus of such  corporation or  association  shall be deemed to be its combined
capital  and  surplus as set forth in its most  recent  report of  condition  so
published.  In case at any time the  Trustee  or the Trust  Administrator  shall
cease to be eligible in accordance  with the  provisions  of this Section,  such
entity shall resign  immediately in the manner and with the effect  specified in
Section 8.08.

            SECTION 8.08      RESIGNATION AND REMOVAL.

            Either of the  Trustee  or the Trust  Administrator  may at any time
resign and be discharged  from the trust hereby created by giving written notice
of resignation to the Master Servicer, such resignation to be effective upon the
appointment of a successor trustee or trust  administrator.  Upon receiving such
notice of resignation,  the Master  Servicer shall promptly  appoint a successor
trustee or trust administrator by written instrument,  in duplicate, one copy of
which  instrument shall be delivered to the resigning entity and one copy to its
successor.  If no  successor  trustee  or trust  administrator  shall  have been
appointed and have accepted  appointment within 30 days after the giving of such
notice of resignation, the resigning Trustee or Trust Administrator, as the case
may be, may petition any court of competent  jurisdiction for the appointment of
a successor trustee or trust administrator.

            If at any time the Trustee or the Trust Administrator shall cease to
be eligible in accordance  with the provisions of Section 8.07 and shall fail to
resign after written request for its resignation by the Master  Servicer,  or if
at any time the Trustee or the Trust  Administrator  shall  become  incapable of
acting,  or an order for relief  shall have been  entered in any  bankruptcy  or
insolvency  proceeding with respect to such entity, or a receiver of such entity
or of its property  shall be appointed,  or any public officer shall take charge
or  control of the  Trustee or the Trust  Administrator  or of the  property  or
affairs  of  the  Trustee  or  the  Trust   Administrator  for  the  purpose  of
rehabilitation,  conversion or liquidation, or the Master Servicer shall deem it
necessary  in order to  change  the  situs of the  Trust  Estate  for  state tax
reasons,  then the Master  Servicer  shall  remove the Trustee  and/or the Trust
Administrator,  as the case may be,  and  appoint  a  successor  trustee  and/or
successor trust administrator by written instrument,  in duplicate,  one copy of
which  instrument  shall be delivered to the Trustee or Trust  Administrator  so
removed and one copy to the successor trustee or successor trust  administrator,
as the case may be.

            The Holders of  Certificates  evidencing  in the  aggregate not less
than 51% of the Voting Interests  represented by all  Certificates  (except that
any Certificate registered in the name of the Seller, the Master Servicer or any
affiliate  thereof  will not be taken into  account in  determining  whether the
requisite Voting Interests has been obtained) may at any time remove the Trustee
and/or the Trust  Administrator and appoint a successor by written instrument or
instruments,  in triplicate,  signed by such holders or their  attorneys-in-fact
duly authorized, one complete set of which instruments shall be delivered to the
Master  Servicer,  one complete set of which shall be delivered to the entity or
entities so removed and one  complete  set of which  shall be  delivered  to the
successor so appointed.

            Any resignation or removal of the Trustee or the Trust Administrator
and appointment of a successor pursuant to any of the provisions of this Section
shall become  effective  upon  acceptance  of  appointment  by the  successor as
provided in Section 8.09.

            SECTION 8.09      SUCCESSOR.

            Any successor trustee or successor trust administrator  appointed as
provided in Section 8.08 shall  execute,  acknowledge  and deliver to the Master
Servicer and to its predecessor trustee or trust administrator,  as the case may
be, an  instrument  accepting  such  appointment  hereunder,  and  thereupon the
resignation or removal of the predecessor  trustee or trust  administrator shall
become  effective,  and  such  successor,  without  any  further  act,  deed  or
reconveyance,  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  or trust  administrator,  as the  case  may be,  herein.  The
predecessor  trustee or trust  administrator  shall deliver to its successor all
Owner  Mortgage  Loan Files and  related  documents  and  statements  held by it
hereunder  (other  than any  Owner  Mortgage  Loan  Files at the time  held by a
Custodian,  which  Custodian  shall  become the agent of any  successor  trustee
hereunder), and the Seller, the Master Servicer and the predecessor entity 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 or successor trust  administrator,  as the case may be, all such rights,
powers,  duties and  obligations.  No  successor  shall  accept  appointment  as
provided in this Section  unless at the time of such  acceptance  such successor
shall be eligible under the provisions of Section 8.07.

            Upon  acceptance of  appointment  by a successor as provided in this
Section, the Master Servicer shall mail notice of the succession of such trustee
or  trust  administrator  hereunder  to all  Holders  of  Certificates  at their
addresses as shown in the Certificate  Register. If the Master Servicer fails to
mail such notice within ten days after  acceptance  of the successor  trustee or
successor  trust  administrator,  as the case may be, the  successor  trustee or
trust  administrator  shall cause such notice to be mailed at the expense of the
Master Servicer.

            SECTION 8.10      MERGER OR CONSOLIDATION.

            Any Person into which either the Trustee or the Trust  Administrator
may be merged or converted or with which it may be consolidated, to which it may
sell or  transfer  its  corporate  trust  business  and  assets  as a  whole  or
substantially  as a  whole  or any  Person  resulting  from  any  merger,  sale,
transfer,  conversion  or  consolidation  to  which  the  Trustee  or the  Trust
Administrator shall be a party, or any Person succeeding to the business of such
entity,  shall be the  successor of the Trustee or Trust  Administrator,  as the
case  may be,  hereunder;  provided,  however,  that (i)  such  Person  shall be
eligible under the  provisions of Section 8.07,  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,  and (ii) the Trustee or the
Trust Administrator,  as the case may be, shall deliver an Opinion of Counsel to
the  Seller  and  the  Master   Servicer  to  the  effect   that  such   merger,
consolidation,  sale or transfer will not subject the REMIC to federal, state or
local tax or cause the REMIC to not qualify as a REMIC, which Opinion of Counsel
shall be at the sole expense of the Trustee or the Trust  Administrator,  as the
case may be.

            SECTION 8.11      AUTHENTICATING AGENT.

            The Trust  Administrator may appoint an Authenticating  Agent, which
shall  be   authorized  to  act  on  behalf  of  the  Trust   Administrator   in
authenticating Certificates. Wherever reference is made in this Agreement to the
authentication  of  Certificates  by  the  Trust   Administrator  or  the  Trust
Administrator's  countersignature,  such  reference  shall be deemed to  include
authentication on behalf of the Trust Administrator by the Authenticating  Agent
and  a  certificate   of   authentication   executed  on  behalf  of  the  Trust
Administrator  by the  Authenticating  Agent. The  Authenticating  Agent must be
acceptable  to the  Seller  and the Master  Servicer  and must be a  corporation
organized and doing  business  under the laws of the United States of America or
of any state,  having a  principal  office and place of  business in a state and
city acceptable to the Seller and the Master Servicer, having a combined capital
and surplus of at least  $15,000,000,  authorized  under such laws to do a trust
business  and  subject  to  supervision  or  examination  by  federal  or  state
authorities.

            Any corporation into which the Authenticating Agent may be merged or
converted or with which it may be  consolidated,  or any  corporation  resulting
from any merger,  conversion or consolidation to which the Authenticating  Agent
shall be a party, or any corporation succeeding to the corporate agency business
of the  Authenticating  Agent,  shall be the  Authenticating  Agent  without the
execution  or filing of any  paper or any  further  act on the part of the Trust
Administrator or the Authenticating Agent.

            The  Authenticating  Agent may at any time resign by giving at least
30 days'  advance  written  notice  of  resignation  to the  Trustee,  the Trust
Administrator,  the Seller and the Master Servicer.  The Trust Administrator may
at any time terminate the agency of the  Authenticating  Agent by giving written
notice thereof to the Authenticating  Agent, the Seller and the Master Servicer.
Upon receiving a notice of resignation or upon such a termination, or in case at
any time the Authenticating  Agent shall cease to be eligible in accordance with
the  provisions of this Section 8.11,  the Trust  Administrator  promptly  shall
appoint a  successor  Authenticating  Agent,  which shall be  acceptable  to the
Master  Servicer,  and shall  give  written  notice of such  appointment  to the
Seller, and shall mail notice of such appointment to all Certificateholders. Any
successor  Authenticating  Agent upon  acceptance of its  appointment  hereunder
shall become vested with all the rights,  powers, duties and responsibilities of
its  predecessor  hereunder,   with  like  effect  as  if  originally  named  as
Authenticating  Agent  herein.  No  successor   Authenticating  Agent  shall  be
appointed unless eligible under the provisions of this Section 8.11.

            The  Authenticating  Agent shall have no responsibility or liability
for any action taken by it as such at the direction of the Trust  Administrator.
Any  reasonable  compensation  paid  to  the  Authenticating  Agent  shall  be a
reimbursable expense under Section 8.06.

            SECTION 8.12      SEPARATE TRUSTEES AND CO-TRUSTEES.

            The Trustee shall have the power from time to time to appoint one or
more  persons or  corporations  to act either as  co-trustees  jointly  with the
Trustee,  or as  separate  trustees,  for  the  purpose  of  holding  title  to,
foreclosing or otherwise taking action with respect to any Mortgage Loan outside
the state where the  Trustee has its  principal  place of  business,  where such
separate  trustee or  co-trustee  is necessary  or advisable  (or the Trustee is
advised by the Master  Servicer  that such  separate  trustee or  co-trustee  is
necessary  or  advisable)  under  the laws of any  state  in  which a  Mortgaged
Property  is located or for the  purpose of  otherwise  conforming  to any legal
requirement, restriction or condition in any state in which a Mortgaged Property
is located or in any state in which any portion of the Trust  Estate is located.
The Master Servicer shall advise the Trustee when, in its good faith opinion,  a
separate  trustee or  co-trustee  is necessary or  advisable as  aforesaid.  The
separate  trustees or co-trustees so appointed shall be trustees for the benefit
of all of the Certificateholders and shall have such powers, rights and remedies
as shall be specified in the instrument of appointment;  provided, however, that
no such  appointment  shall, or shall be deemed to,  constitute the appointee an
agent of the Trustee.  The Seller and the Master Servicer shall join in any such
appointment,  but such joining shall not be necessary for the  effectiveness  of
such appointment.

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

            (i)  all powers, duties, obligations  and rights  conferred upon the
Trustee,  in respect of the  receipt,  custody  and  payment of moneys  shall be
exercised solely by the Trustee;

            (ii)  all other rights, powers,  duties and obligations conferred or
imposed upon the Trustee  shall be  conferred  or imposed upon and  exercised or
performed by the Trustee and such separate trustee or co-trustee jointly, except
to the extent that under any law of any jurisdiction in which any particular act
or acts are to be performed (whether as Trustee hereunder or as successor to the
Master  Servicer  hereunder)  the Trustee shall be incompetent or unqualified to
perform  such act or acts,  in which  event  such  rights,  powers,  duties  and
obligations  (including  the holding of title to the Trust Estate or any portion
thereof in any such  jurisdiction)  shall be  exercised  and  performed  by such
separate trustee or co-trustee;

               (iii)  no  separate  trustee  or  co-trustee  hereunder  shall be
personally liable by reason of any act or omission of any other separate trustee
or co-trustee hereunder; and

               (iv)  the  Trustee may at any time accept the  resignation  of or
remove  any  separate  trustee  or  co-trustee  so  appointed  by  it,  if  such
resignation or removal does not violate the other terms of this Agreement.

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

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

            No separate  trustee or  co-trustee  hereunder  shall be required to
meet the  terms  of  eligibility  as a  successor  trustee  under  Section  8.07
hereunder and no notice to  Certificateholders  of the appointment thereof shall
be required under Section 8.09 hereof.

            The  Trustee  agrees to  instruct  its  co-trustees,  if any, to the
extent necessary to fulfill such entity's obligations hereunder.

            The Master  Servicer  shall pay the reasonable  compensation  of the
co-trustees to the extent,  and in accordance  with the standards,  specified in
Section 8.06 hereof.

            SECTION 8.13      APPOINTMENT OF CUSTODIANS.

            The  Trust  Administrator  may at any time on or after  the  Closing
Date,  with the consent of the Master  Servicer  and the Seller,  appoint one or
more  Custodians  to hold all or a portion of the Owner  Mortgage  Loan Files as
agent for the Trust  Administrator,  by  entering  into a  Custodial  Agreement.
Subject to this Article VIII, the Trust Administrator  agrees to comply with the
terms of each  Custodial  Agreement  and to  enforce  the terms  and  provisions
thereof  against the Custodian for the benefit of the  Certificateholders.  Each
Custodian shall be a depository institution subject to supervision by federal or
state  authority,  shall  have  a  combined  capital  and  surplus  of at  least
$10,000,000  and shall be qualified to do business in the  jurisdiction in which
it holds any Owner Mortgage Loan File.  Each Custodial  Agreement may be amended
only as provided in Section 10.01(a).

            SECTION 8.14      TAX MATTERS; COMPLIANCE WITH REMIC PROVISIONS.

            (a) Each of the  Trustee, the Trust  Administrator  and the  Master
Servicer  covenants and agrees that it shall  perform its duties  hereunder in a
manner  consistent  with the REMIC  Provisions  and shall not knowingly take any
action or fail to take any action that would (i) affect the determination of the
Trust Estate's  status as a REMIC;  or (ii) cause the imposition of any federal,
state or local  income,  prohibited  transaction,  contribution  or other tax on
either the REMIC or the Trust Estate.  The Master  Servicer,  or, in the case of
any tax return or other action  required by law to be performed  directly by the
Trust Administrator,  the Trust Administrator,  shall (i) prepare or cause to be
prepared, timely cause to be signed by the Trustee and file or cause to be filed
annual  federal  and  applicable  state and local  income  tax  returns  using a
calendar  year as the  taxable  year for the  REMIC  and the  accrual  method of
accounting;  (ii) in the first such  federal  tax return,  make,  or cause to be
made, elections  satisfying the requirements of the REMIC Provisions,  on behalf
of the  Trust  Estate,  to treat the Trust  Estate  as a REMIC;  (iii)  prepare,
execute and forward,  or cause to be prepared,  executed and  forwarded,  to the
Certificateholders  all information reports or tax returns required with respect
to the REMIC, as and when required to be provided to the Certificateholders, and
to the  Internal  Revenue  Service and any other  relevant  governmental  taxing
authority  in  accordance  with the REMIC  Provisions  and any other  applicable
federal,  state or local laws, including without limitation  information reports
relating to "original  issue  discount" and "market  discount" as defined in the
Code based upon the issue prices,  prepayment assumption and cash flows provided
by the Seller to the Trust  Administrator  and  calculated on a monthly basis by
using the issue  prices of the  Certificates;  (iv) make  available  information
necessary  for the  application  of any tax imposed on  transferors  of residual
interests to "disqualified  organizations" (as defined in the REMIC Provisions);
(v) file Forms SS-4 and 8811 and respond to inquiries by  Certificateholders  or
their nominees  concerning  information  returns,  reports or tax returns;  (vi)
maintain (or cause to be maintained by the Servicers)  such records  relating to
the  REMIC,  including  but not  limited  to the  income,  expenses,  individual
Mortgage Loans  (including REO Mortgage  Loans,  other assets and liabilities of
the REMIC,  and the fair market value and adjusted  basis of the REMIC  property
determined at such intervals as may be required by the Code, as may be necessary
to  prepare  the  foregoing  returns  or  information  reports;  (vii)  exercise
reasonable care not to allow the creation of any "interests" in the REMIC within
the meaning of Code Section  860D(a)(2) other than the interests  represented by
the Class  A-1,  Class  A-2,  Class  A-3,  Class  A-4,  Class A-PO and Class A-R
Certificates  and the Class B-1,  Class B-2, Class B-3, Class B-4, Class B-5 and
Class  B-6  Certificates;  (viii)  exercise  reasonable  care not to  allow  the
occurrence of any "prohibited  transactions"  within the meaning of Code Section
860F(a), unless the Master Servicer shall have provided an Opinion of Counsel to
the Trustee that such  occurrence  would not (a) result in a taxable  gain,  (b)
otherwise  subject  either the Trust Estate or the REMIC to tax or (c) cause the
Trust Estate to fail to qualify as a REMIC; (ix) exercise reasonable care not to
allow the REMIC to receive  income  from the  performance  of  services  or from
assets not permitted under the REMIC  Provisions to be held by a REMIC;  (x) pay
(on  behalf of the  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 a REMIC after the
Startup Day, imposed on the REMIC, when and as the same shall be due and payable
(but  such  obligation  shall  not  prevent  the  Master  Servicer  or any other
appropriate  Person from contesting any such tax in appropriate  proceedings and
shall not prevent the Master Servicer from withholding or depositing  payment of
such tax, if permitted  by law,  pending the outcome of such  proceedings);  and
(xi) if  required  or  permitted  by the Code and  applicable  law,  act as "tax
matters person" for the REMIC within the meaning of Treasury Regulations Section
1.860F-4(d),  and the Master Servicer is hereby designated as agent of the Class
A-R  Certificateholder  for such  purpose  (or if the Master  Servicer is not so
permitted, the Holder of the Class A-R Certificate shall be a tax matters person
in accordance with the REMIC Provisions).  The Master Servicer shall be entitled
to be  reimbursed  pursuant to Section 3.02 for any taxes paid by it pursuant to
clause (x) of the preceding  sentence,  except to the extent that such taxes are
imposed as a result of the bad faith, willful misfeasance or gross negligence of
the  Master  Servicer  in the  performance  of its  obligations  hereunder.  The
Trustee's  sole  duties  with  respect to the REMIC are to sign the tax  returns
referred  to in clause  (i) of the second  preceding  sentence  and comply  with
written directions from the Master Servicer or the Trust Administrator.

            In order to enable the Master Servicer,  the Trust  Administrator or
the Trustee,  as the case may be, to perform its duties as set forth above,  the
Seller shall provide, or cause to be provided, to the Master Servicer within ten
days after the Closing  Date all  information  or data that the Master  Servicer
determines to be relevant for tax purposes to the valuations and offering prices
of the Certificates, including, without limitation, the price, yield, prepayment
assumption  and  projected  cash  flows of each  Class of  Certificates  and the
Mortgage  Loans in the  aggregate.  Thereafter,  the Seller shall provide to the
Master Servicer,  the Trust  Administrator  or the Trustee,  as the case may be,
promptly upon request therefor, any such additional information or data that the
Master Servicer, the Trust Administrator or the Trustee, as the case may be, may
from time to time request in order to enable the Master  Servicer to perform its
duties as set forth above.  The Seller hereby  indemnifies the Master  Servicer,
the Trust  Administrator  or the  Trustee,  as the case may be, for any  losses,
liabilities,  damages,  claims or  expenses  of the Master  Servicer,  the Trust
Administrator or the Trustee arising from any errors or  miscalculations  by the
Master Servicer, the Trust Administrator or the Trustee pursuant to this Section
that  result  from any  failure  of the  Seller  to  provide,  or to cause to be
provided,  accurate  information  or  data to the  Master  Servicer,  the  Trust
Administrator or the Trustee,  as the case may be, on a timely basis. The Master
Servicer hereby indemnifies the Seller, the Trust  Administrator and the Trustee
for any losses,  liabilities,  damages,  claims or  expenses of the Seller,  the
Trust  Administrator or the Trustee arising from the Master  Servicer's  willful
misfeasance,  bad faith or gross  negligence  in  preparing  any of the federal,
state and local tax returns of the REMIC as described  above.  In the event that
the Trust Administrator prepares any of the federal, state and local tax returns
of the REMIC as described above, the Trust Administrator  hereby indemnifies the
Seller,  the  Master  Servicer  and the  Trustee  for any  losses,  liabilities,
damages,  claims or expenses of the Seller,  the Master  Servicer or the Trustee
arising  from  the  Trust  Administrator's  willful  misfeasance,  bad  faith or
negligence in connection with such preparation.

            (b) Notwithstanding anything in this Agreement to the contrary, each
of the Master Servicer,  the Trust  Administrator and the Trustee shall pay from
its own funds,  without any right of reimbursement  therefor,  the amount of any
costs, liabilities and expenses incurred by the Trust Estate (including, without
limitation,  any and all federal,  state or local taxes, including taxes imposed
on "prohibited  transactions" within the meaning of the REMIC Provisions) if and
to the extent that such costs,  liabilities and expenses arise from a failure of
the Master Servicer,  the Trust  Administrator or the Trustee to,  respectively,
perform its obligations under this Section 8.14.

            SECTION 8.15      MONTHLY ADVANCES.

            In the event that Norwest  Mortgage fails to make a Periodic Advance
required to be made pursuant to the Norwest Servicing Agreement on or before the
Distribution  Date,  the Trust  Administrator  shall make a Periodic  Advance as
required by Section  3.03 hereof;  provided,  however,  the Trust  Administrator
shall not be required to make such Periodic  Advances if prohibited by law or if
it determines that such Periodic Advance would be a Nonrecoverable Advance. With
respect  to those  Periodic  Advances  which  should  have been made by  Norwest
Mortgage,  the  Trust  Administrator  shall be  entitled,  pursuant  to  Section
3.02(a)(i),  (ii) or (v) hereof,  to be reimbursed from the Certificate  Account
for Periodic Advances and Nonrecoverable Advances made by it.

            SECTION 8.16      TRUSTEE   COVENANTS   CONCERNING   YEAR   2000
COMPLIANCE.

            The Trustee  covenants that it is working to modify its computer and
other  systems  used  in the  performance  of its  duties  as  trustee  for  the
Certificates to operate in a manner such that, on and after January 1, 2000, the
Trustee can perform its duties in accordance with the terms of this Agreement.

            SECTION 8.17      TRUST ADMINISTRATOR  COVENANTS  CONCERNING YEAR
2000 COMPLIANCE.

            The Trust  Administrator  covenants that it is working to modify its
computer  and  other  systems  used in the  performance  of its  duties as trust
administrator  for the  Certificates  to operate in a manner  such that,  on and
after  January  1,  2000,  the Trust  Administrator  can  perform  its duties in
accordance with the terms of this Agreement.


<PAGE>



                                   ARTICLE IX

                                   TERMINATION

            SECTION 9.01      TERMINATION  UPON  PURCHASE  BY THE  SELLER  OR
LIQUIDATION OF ALL MORTGAGE LOANS.

            Subject  to   Section   9.02,   the   respective   obligations   and
responsibilities of the Seller, the Master Servicer, the Trust Administrator and
the Trustee created hereby (other than the obligation of the Trust Administrator
to make certain payments after the Final Distribution Date to Certificateholders
and the obligation of the Master Servicer to send certain notices as hereinafter
set forth and the tax reporting obligations under Sections 4.05 and 8.14 hereof)
shall  terminate  upon  the  last  action  required  to be  taken  by the  Trust
Administrator  on the  Final  Distribution  Date  pursuant  to this  Article  IX
following  the earlier of (i) the purchase by the Seller of all  Mortgage  Loans
and all property acquired in respect of any Mortgage Loan remaining in the Trust
Estate at a price equal to the sum of (x) 100% of the unpaid  principal  balance
of each  Mortgage  Loan  (other  than any REO  Mortgage  Loan)  as of the  Final
Distribution  Date,  and (y) the fair  market  value of the  Mortgaged  Property
related to any REO Mortgage Loan (as determined by the Master Servicer as of the
close of business on the third  Business Day next  preceding the date upon which
notice of any such  termination is furnished to  Certificateholders  pursuant to
the third paragraph of this Section 9.01),  plus any accrued and unpaid interest
through the last day of the month  preceding  the month of such  purchase at the
applicable Mortgage Interest Rate less any Fixed Retained Yield on each Mortgage
Loan  (including  any REO  Mortgage  Loan) and (ii) the final  payment  or other
liquidation  (or any advance with  respect  thereto) of the last  Mortgage  Loan
remaining in the Trust Estate  (including  for this purpose the discharge of any
Mortgagor  under a defaulted  Mortgage Loan on which a Servicer is not obligated
to foreclose due to environmental impairment) or the disposition of all property
acquired upon  foreclosure  or deed in lieu of foreclosure of any Mortgage Loan;
provided,  however,  that in no event shall the trust  created  hereby  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, living on the date hereof.

            The right of the  Seller  to  purchase  all the  assets of the Trust
Estate pursuant to clause (i) of the preceding  paragraph are subject to Section
9.02 and conditioned upon the Pool Scheduled  Principal  Balance of the Mortgage
Loans as of the Final  Distribution Date being less than the amount set forth in
Section 11.22. In the case of any purchase by the Seller pursuant to said clause
(i),  the Seller  shall  provide to the Trust  Administrator  the  certification
required by Section 3.04 and the Trust  Administrator  and the Custodian  shall,
promptly  following  payment of the  purchase  price,  release to the Seller the
Owner Mortgage Loan Files pertaining to the Mortgage Loans being purchased.

            Notice of any termination,  specifying the Final  Distribution  Date
(which shall be a date that would  otherwise be a Distribution  Date) upon which
the   Certificateholders   may  surrender   their   Certificates  to  the  Trust
Administrator for payment of the final  distribution and cancellation,  shall be
given promptly by the Master Servicer (if it is exercising its right to purchase
the  assets of the Trust  Estate)  or by the Trust  Administrator  (in any other
case) by letter to  Certificateholders  mailed not earlier  than the 15th day of
the month preceding the month of such final  distribution and not later than the
twentieth day of the month of such final  distribution  specifying (A) the Final
Distribution Date upon which final payment of the Certificates will be made upon
presentation  and surrender of Certificates at the office or agency of the Trust
Administrator  therein designated,  (B) the amount of any such final payment and
(C) that the Record Date otherwise  applicable to such  Distribution Date is not
applicable,  payments  being made (except in the case of any Class A Certificate
surrendered  on a prior  Distribution  Date  pursuant to Section 4.01) only upon
presentation  and surrender of the  Certificates  at the office or agency of the
Trust  Administrator  therein specified.  If the Master Servicer is obligated to
give notice to Certificateholders as aforesaid, it shall give such notice to the
Trust  Administrator  and the  Certificate  Registrar at the time such notice is
given to  Certificateholders.  In the event  such  notice is given by the Master
Servicer,  the Master  Servicer shall deposit in the  Certificate  Account on or
before the Final  Distribution  Date in  immediately  available  funds an amount
equal to the purchase price for the assets of the Trust Estate computed as above
provided.  Failure to give notice of termination  as described  herein shall not
entitle a  Certificateholder  to any interest beyond the interest payable on the
Final Distribution Date.

            Upon  presentation  and  surrender  of the  Certificates,  the Trust
Administrator shall cause to be distributed to  Certificateholders  on the Final
Distribution  Date in proportion  to their  respective  Percentage  Interests an
amount equal to (i) as to the Classes of Class A  Certificates,  the  respective
Principal  Balance  together with any related Class A Unpaid Interest  Shortfall
and one month's  interest in an amount equal to the respective  Interest Accrual
Amount, (ii) as to the Classes of Class B Certificates, the respective Principal
Balance  together  with any related  Class B Unpaid  Interest  Shortfall and one
month's  interest in an amount equal to the respective  Interest  Accrual Amount
and (iii) as to the Class A-R Certificate,  the amounts, if any, which remain on
deposit in the Certificate  Account (other than amounts retained to meet claims)
after  application  pursuant to clauses (i), (ii) and (iii) above and payment to
the Master Servicer of any amounts it is entitled as  reimbursement or otherwise
hereunder.  Notwithstanding the foregoing,  if the price paid pursuant to clause
(i) of the first  paragraph of this Section  9.01,  after  reimbursement  to the
Servicers,  the Master  Servicer  and the Trust  Administrator  of any  Periodic
Advances,  is  insufficient to pay in full the amounts set forth in clauses (i),
(ii) and (iii) of this paragraph, then any shortfall in the amount available for
distribution  to  Certificateholders  shall be  allocated  in  reduction  of the
amounts  otherwise  distributable  on the  Final  Distribution  Date in the same
manner as Realized Losses are allocated pursuant to Sections 4.02(b) and 4.02(g)
hereof. Such distribution on the Final Distribution Date shall be in lieu of the
distribution  otherwise required to be made on such Distribution Date in respect
of each Class of Certificates.

            In the event that all of the Certificateholders  shall not surrender
their  Certificates  for final  payment and  cancellation  within  three  months
following the Final  Distribution  Date, the Trust  Administrator  shall on such
date cause all funds,  if any, in the  Certificate  Account not  distributed  in
final distribution to  Certificateholders to be withdrawn therefrom and credited
to the  remaining  Certificateholders  by  depositing  such  funds in a separate
escrow  account  for the  benefit  of such  Certificateholders,  and the  Master
Servicer (if it exercised  its right to purchase the assets of the Trust Estate)
or the Trust  Administrator  (in any other  case)  shall  give a second  written
notice to the remaining  Certificateholders  to surrender their Certificates for
cancellation and receive the final distribution with respect thereto.  If within
three months after the second  notice all the  Certificates  shall not have been
surrendered  for  cancellation,  the Trust  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 on deposit in such escrow account.

            SECTION 9.02      ADDITIONAL TERMINATION REQUIREMENTS.

            In the event of a termination  of the Trust Estate upon the exercise
by the Seller of its  purchase  option as  provided in Section  9.01,  the Trust
Estate  shall  be  terminated  in  accordance  with  the  following   additional
requirements,  unless the Trust Administrator has received an Opinion of Counsel
to the  effect  that any  other  manner of  termination  (i) will  constitute  a
"qualified  liquidation"  of the Trust Estate within the meaning of Code Section
860F(a)(4)(A)  and (ii) will not  subject  the REMIC to federal tax or cause the
Trust Estate to fail to qualify as a REMIC at any time that any Certificates are
outstanding:

            (i) The notice given by the Master Servicer under Section 9.01 shall
provide  that  such  notice  constitutes  the  adoption  of a plan  of  complete
liquidation of the REMIC as of the date of such notice (or, if earlier, the date
on which the first  such  notice is mailed to  Certificateholders).  The  Master
Servicer  shall also specify such date in a statement  attached to the final tax
return of the REMIC; and

            (ii) At or after  the time of  adoption  of such a plan of  complete
liquidation  and  at  or  prior  to  the  Final  Distribution  Date,  the  Trust
Administrator shall sell all of the assets of the Trust Estate to the Seller for
cash at the purchase price  specified in Section 9.01 and shall  distribute such
cash within 90 days of such adoption in the manner specified in Section 9.01.


<PAGE>


                                    ARTICLE X

                            MISCELLANEOUS PROVISIONS

            SECTION 10.01     AMENDMENT.

            (a) This  Agreement or any  Custodial  Agreement may be amended from
time to time by the Seller, the Master Servicer, the Trust Administrator and the
Trustee and with respect only to amendments  affecting the rights or obligations
of  Ambac,  with  the  consent  of  Ambac,  without  the  consent  of any of the
Certificateholders,  (i) to cure any  ambiguity  or mistake,  (ii) to correct or
supplement any provisions  herein or therein which may be inconsistent  with any
other provisions herein or therein, (iii) to modify,  eliminate or add to any of
its   provisions   to  such  extent  as  shall  be  necessary  to  maintain  the
qualification  of the Trust Estate as a REMIC at all times that any Certificates
are  outstanding  or to avoid or  minimize  the  risk of the  imposition  of any
federal tax on the Trust Estate or the REMIC  pursuant to the Code that would be
a claim  against the Trust  Estate,  provided that (a) the Trustee and the Trust
Administrator have received an Opinion of Counsel to the effect that such action
is necessary or desirable to maintain such qualification or to avoid or minimize
the risk of the  imposition  of any such tax and (b) such  action  shall not, as
evidenced by such Opinion of Counsel,  adversely  affect in any material respect
the interests of any Certificateholder,  (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 (without, in the case of the Class
A-3  Certificates,  giving  effect to the  guaranty  provided by Ambac),  (v) to
modify,  eliminate  or  add to the  provisions  of  Section  5.02  or any  other
provisions hereof  restricting  transfer of the Certificates,  provided that the
Master  Servicer  for  purposes  of  Section  5.02  has  determined  in its sole
discretion that any such  modifications to this Agreement will neither adversely
affect the rating on the  Certificates  nor give rise to a risk that  either the
Trust Estate or the REMIC or any of the Certificateholders  will be subject to a
tax  caused by a transfer  to a  non-permitted  transferee  and (vi) to make any
other  provisions  with  respect  to  matters or  questions  arising  under this
Agreement or such Custodial Agreement which shall not be materially inconsistent
with the provisions of this  Agreement,  provided that such action shall not, as
evidenced by an Opinion of Counsel, adversely affect in any material respect the
interests of any Certificateholder.

            This  Agreement or any Custodial  Agreement may also be amended from
time to time by the Seller, the Master Servicer, the Trust Administrator and the
Trustee with the consent of Ambac (only with respect to amendments affecting the
rights or  obligations of Ambac) and the Holders of  Certificates  evidencing in
the aggregate not less than 66-2/3% of the  aggregate  Voting  Interests of each
Class of Certificates  affected thereby for the purpose of adding any provisions
to or  changing  in any  manner or  eliminating  any of the  provisions  of this
Agreement or such  Custodial  Agreement or of modifying in any manner the rights
of the Holders of Certificates of such Class;  provided,  however,  that no such
amendment  shall (i) reduce in any manner the amount of, or delay the timing of,
payments  received on Mortgage Loans which are required to be distributed on any
Certificate  without  the  consent  of the  Holder  of  such  Certificate,  (ii)
adversely  affect  in any  material  respect  the  interest  of the  Holders  of
Certificates  of any Class in a manner  other  than as  described  in clause (i)
hereof without the consent of Holders of Certificates of such Class  evidencing,
as to such Class,  Voting  Interests  aggregating not less than 66-2/3% or (iii)
reduce the  aforesaid  percentage  of  Certificates  of any Class the Holders of
which are required to consent to any such amendment,  without the consent of the
Holders of all Certificates of such Class then outstanding.

            Notwithstanding  any contrary  provision of this Agreement,  neither
the Trustee nor the Trust  Administrator  shall consent to any amendment to this
Agreement  unless it shall  have  first  received  an  Opinion of Counsel to the
effect that such  amendment will not subject the REMIC to tax or cause the Trust
Estate  to fail to  qualify  as a REMIC at any time  that any  Certificates  are
outstanding.

            Promptly after the execution of any amendment  requiring the consent
of   Certificateholders,   the  Trust   Administrator   shall  furnish   written
notification of the substance of such amendment to each Certificateholder.

            It shall not be  necessary  for the  consent  of  Certificateholders
under this  Section  10.01(a) to approve  the  particular  form of any  proposed
amendment,  but it  shall  be  sufficient  if such  consent  shall  approve  the
substance  thereof.  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 Trust Administrator may prescribe.

            (b)  Notwithstanding  any contrary provision of this Agreement,  the
Master  Servicer may,  from time to time,  amend  Schedule I hereto  without the
consent of any Certificateholder, the Trust Administrator, the Trustee or Ambac;
provided, however, (i) that such amendment does not conflict with any provisions
of the related Servicing  Agreement,  (ii) that the related Servicing  Agreement
provides  for the  remittance  of each type of  Unscheduled  Principal  Receipts
received by such Servicer during the Applicable  Unscheduled  Principal  Receipt
Period (as so amended) related to each  Distribution Date to the Master Servicer
no later than the 24th day of the month in which such  Distribution  Date occurs
and (iii) that such  amendment  is for the  purpose of changing  the  Applicable
Unscheduled  Principal  Receipt  Period for all Mortgage  Loans  serviced by any
Servicer  to a  Mid-Month  Receipt  Period  with  respect  to  Full  Unscheduled
Principal  Receipts and to a Prior Month Receipt  Period with respect to Partial
Unscheduled Principal Receipts.

            A copy of any  amendment  to  Schedule  I pursuant  to this  Section
10.01(b) shall be promptly forwarded to the Trust Administrator.

            SECTION 10.02     RECORDATION OF AGREEMENT.

            This  Agreement  (or  an  abstract  hereof,  if  acceptable  to  the
applicable recording office) is subject to recordation in all appropriate public
offices  for  real  property  records  in all  the  towns  or  other  comparable
jurisdictions in which any or all of the Mortgaged Properties are situated,  and
in any other  appropriate  public office or elsewhere,  such  recordation  to be
effected by the Master  Servicer  and at its expense on  direction  by the Trust
Administrator,  but only upon direction  accompanied by an Opinion of Counsel to
the  effect  that such  recordation  materially  and  beneficially  affects  the
interests of the Certificateholders.

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

            SECTION 10.03     LIMITATION ON RIGHTS OF CERTIFICATEHOLDERS.

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

            Except as otherwise expressly provided herein, no Certificateholder,
solely by virtue of its status as a  Certificateholder,  shall have any right to
vote or in any manner  otherwise  control the  operation  and  management of the
Trust Estate,  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  Agreement
pursuant to any provision hereof.

            No   Certificateholder,   solely  by   virtue   of  its   status  as
Certificateholder,  shall  have  any  right  by  virtue  or by  availing  of any
provision of this  Agreement  to institute  any suit,  action or  proceeding  in
equity or at law upon or under or with  respect to this  Agreement,  unless such
Holder  previously shall have given to the Trust  Administrator a written notice
of default and of the continuance thereof, as hereinbefore  provided, and unless
also the  Holders  of  Certificates  evidencing  not less than 25% of the Voting
Interest  represented by all  Certificates  shall have made written request upon
the Trust  Administrator to institute such action, suit or proceeding in its own
name as Trust  Administrator  hereunder  and  shall  have  offered  to the Trust
Administrator  such  reasonable  indemnity  as it may require  against the cost,
expenses  and  liabilities  to be  incurred  therein or  thereby,  and the Trust
Administrator,  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  Certificateholder  and the Trust
Administrator,  that no one or more Holders of Certificates shall have any right
in any  manner  whatever  by  virtue or by  availing  of any  provision  of this
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,  or to enforce any right under this Agreement,  except
in the manner herein provided and for the benefit of all Certificateholders. For
the protection and enforcement of the provisions of this Section, each and every
Certificateholder  and the Trust  Administrator shall be entitled to such relief
as can be given either at law or in equity.

            SECTION 10.04     GOVERNING LAW; JURISDICTION.

            This Agreement shall be construed in accordance with the laws of the
State of New York  (without  regard to  conflicts of laws  principles),  and the
obligations, rights and remedies of the parties hereunder shall be determined in
accordance with such laws.

            SECTION 10.05     NOTICES.

            All  demands,  notices  and  communications  hereunder  shall  be in
writing and shall be deemed to have been duly given if  personally  delivered at
or mailed by certified or registered mail,  return receipt  requested (i) in the
case of the Seller,  to Norwest Asset Securities  Corporation,  7485 New Horizon
Way,  Frederick,  Maryland 21703,  Attention:  Chief Executive Officer,  or such
other  address as may hereafter be furnished to the Master  Servicer,  the Trust
Administrator and the Trustee in writing by the Seller,  (ii) in the case of the
Master  Servicer,  to Norwest Bank  Minnesota,  National  Association,  7485 New
Horizon Way, Frederick,  Maryland 21703, Attention: Vice President or such other
address as may  hereafter  be furnished to the Seller and the Trustee in writing
by the Master Servicer, (iii) in the case of the Trustee, to the Corporate Trust
Office,  (iv) in the case of the Trust  Administrator,  to the  Corporate  Trust
Office,  or such other  address as may  hereafter be furnished to the Seller and
the Master  Servicer  in writing by the Trustee or the Trust  Administrator,  in
each case Attention: Corporate Trust Department and (v) in the case of Ambac, to
Ambac Corporation,  1 State Street Plaza, New York, New York, 10004,  Attention:
Structured   Finance   Department;    Confirmation:    212-668-0340;   Telecopy:
212-363-1459  (in each  case in which  notice  or other  communication  to Ambac
refers to an Event of  Default or a claim  under the  policy or with  respect to
which  failure  on the part of Ambac to  respond  shall be deemed to  constitute
consent or acceptance,  then a copy of such notice or other communication should
also be sent to the  attention  of the  General  Counsel  and shall be marked to
indicate  "URGENT  MATERIAL  ENCLOSED").  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 mailed or transmitted  within the time prescribed in this Agreement shall
be conclusively  presumed to have been duly given,  whether or not the addressee
receives  such  notice,   provided,   however,   that  any  demand,   notice  or
communication  to  or  upon  the  Seller,   the  Master   Servicer,   the  Trust
Administrator or the Trustee shall not be effective until received.

            For all  purposes  of  this  Agreement,  in the  absence  of  actual
knowledge by an officer of the Master Servicer, the Master Servicer shall not be
deemed to have  knowledge  of any act or failure to act of any  Servicer  unless
notified  thereof in  writing  by the  Trustee,  the Trust  Administrator,  such
Servicer or a Certificateholder.

            SECTION 10.06     SEVERABILITY OF PROVISIONS.

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

            SECTION 10.07     SPECIAL NOTICES TO RATING AGENCIES AND AMBAC .

            (a) The Trust  Administrator shall give prompt notice to each Rating
Agency and Ambac of the  occurrence of any of the  following  events of which it
has notice:

            (i) any amendment to this Agreement pursuant to Section 10.01(a);

            (ii) any sale or  transfer of the Class B  Certificates  pursuant to
Section 5.02 to an affiliate of the Seller;

            (iii) any  assignment  by the  Master  Servicer  of its  rights  and
delegation of its duties pursuant to Section 6.06;

            (iv) any  resignation  of the Master  Servicer  pursuant  to Section
6.04;

            (v) the  occurrence  of any of the  Events of  Default  described in
Section 7.01;

            (vi) any notice of termination given to the Master Servicer pursuant
to Section 7.01;

            (vii)  the  appointment  of any  successor  to the  Master  Servicer
pursuant to Section 7.05; or

            (viii) the making of a final payment pursuant to Section 9.01.

            (b) The Master  Servicer  shall give  prompt  notice to each  Rating
Agency and Ambac of the occurrence of any of the following events:

            (i) the appointment of a Custodian pursuant to Section 2.02;

            (ii)  the  resignation  or  removal  of the  Trustee  or  the  Trust
Administrator pursuant to Section 8.08;

            (iii) the appointment of a successor trustee or trust  administrator
pursuant to Section 8.09; or

            (iv) the sale, transfer or other disposition in a single transaction
of 50% or more of the equity interests in the Master Servicer.

            (c) The Master  Servicer  shall  deliver to each  Rating  Agency and
Ambac:

            (i) reports prepared pursuant to Section 3.05; and

            (ii) statements prepared pursuant to Section 4.04.

            SECTION 10.08     COVENANT OF SELLER.

            The  Seller  shall not amend  Article  Third of its  Certificate  of
Incorporation without the prior written consent of each Rating Agency rating the
Certificates.

            SECTION 10.09     RECHARACTERIZATION.

            The Parties  intend the  conveyance  by the Seller to the Trustee of
all of its right,  title and interest in and to the Mortgage  Loans  pursuant to
this Agreement to constitute a purchase and sale and not a loan. Notwithstanding
the  foregoing,  to the extent that such  conveyance is held not to constitute a
sale under applicable law, it is intended that this Agreement shall constitute a
security  agreement under  applicable law and that the Seller shall be deemed to
have  granted to the Trustee a first  priority  security  interest in all of the
Seller's right, title and interest in and to the Mortgage Loans.


<PAGE>



                                   ARTICLE XI

                             TERMS FOR CERTIFICATES

            SECTION 11.01     CLASS A FIXED PASS-THROUGH RATE.

            The Class A Fixed Pass-Through Rate is 6.250% per annum.

            SECTION 11.02     CUT-OFF DATE.

            The Cut-Off Date for the Certificates is May 1, 1999.

            SECTION 11.03     CUT-OFF DATE AGGREGATE PRINCIPAL BALANCE.

            The Cut-Off Date Aggregate Principal Balance is $225,151,601.74.

            SECTION 11.04     ORIGINAL CLASS A PERCENTAGE.

            The Original Class A Percentage is 96.97742128%.

            SECTION 11.05     ORIGINAL  PRINCIPAL  BALANCES OF THE CLASSES OF
CLASS A CERTIFICATES.

            As to the following  Classes of Class A Certificates,  the Principal
Balance of such Class as of the Cut-Off Date, as follows:

                                             Original
                 Class                  Principal Balance

            Class A-1                   $   46,032,900.00
            Class A-2                   $  155,000,000.00
            Class A-3                   $   14,408,000.00
            Class A-4                   $    1,292,000.00
            Class A-PO                  $    1,663,497.87
            Class A-R                   $          100.00

            SECTION 11.06     ORIGINAL CLASS A NON-PO PRINCIPAL BALANCE.

            The Original Class A Non-PO Principal Balance is $216,733,000.00.

            SECTION 11.07     ORIGINAL SUBORDINATED PERCENTAGE.

            The Original Subordinated Percentage is 3.02257872%.

            SECTION 11.08     ORIGINAL CLASS B-1 PERCENTAGE.

            The Original Class B-1 Percentage is 1.86363387%.

            SECTION 11.09     ORIGINAL CLASS B-2 PERCENTAGE.

            The Original Class B-2 Percentage is 0.40315345%.

            SECTION 11.10     ORIGINAL CLASS B-3 PERCENTAGE

            The Original Class B-3 Percentage is 0.25191497%.

            SECTION 11.11     ORIGINAL CLASS B-4 PERCENTAGE.

            The Original Class B-4 Percentage is 0.25191497%.

            SECTION 11.12     ORIGINAL CLASS B-5 PERCENTAGE.

            The Original Class B-5 Percentage is 0.10067650%.

            SECTION 11.13     ORIGINAL CLASS B-6 PERCENTAGE.

            The Original Class B-6 Percentage is 0.15128495%.

            SECTION 11.14     ORIGINAL CLASS B PRINCIPAL BALANCE.

            The Original Class B Principal Balance is $6,755,103.87.

            SECTION 11.15     ORIGINAL  PRINCIPAL  BALANCES OF THE CLASSES OF
CLASS B CERTIFICATES.

            As to the following  Classes of Class B Certificates,  the Principal
Balance of such Class as of the Cut-Off Date, is as follows:

                                                 Original
                Class                       Principal Balance

              Class B-1                    $4,165,000.00
              Class B-2                    $ 901,000.00
              Class B-3                    $ 563,000.00
              Class B-4                    $ 563,000.00
              Class B-5                    $ 225,000.00

              Class B-6$338,103.87

            SECTION 11.16     ORIGINAL CLASS B-1 FRACTIONAL INTEREST.

            The Original Class B-1 Fractional Interest is 1.15894484%.

            SECTION 11.17     ORIGINAL CLASS B-2 FRACTIONAL INTEREST.

            The Original Class B-2 Fractional Interest is 0.75579140%.

            SECTION 11.18     ORIGINAL CLASS B-3 FRACTIONAL INTEREST.

            The Original Class B-3 Fractional Interest is 0.50387642%.

            SECTION 11.19     ORIGINAL CLASS B-4 FRACTIONAL INTEREST.

            The Original Class B-4 Fractional Interest is 0.25196145%.

            SECTION 11.20     ORIGINAL CLASS B-5 FRACTIONAL INTEREST.

            The Original Class B-5 Fractional Interest is 0.15128495%.

            SECTION 11.21     CLOSING DATE.

            The Closing Date is May 26, 1999.

            SECTION 11.22     RIGHT TO PURCHASE.

            The  right of the  Seller  to  purchase  all of the  Mortgage  Loans
pursuant to Section 9.01 hereof  shall be  conditioned  upon the Pool  Scheduled
Principal Balance of the Mortgage Loans being less than  $22,515,160.17  (10% of
the Cut-Off Date Aggregate Principal Balance) at the time of any such purchase.

            SECTION 11.23     WIRE TRANSFER ELIGIBILITY.

            With respect to the Class A (other than the Class A-PO and Class A-R
Certificates)  and the Class B Certificates  (other than the Class B-5 and Class
B-6 Certificates),  the minimum Denomination  eligible for wire transfer on each
Distribution Date is $500,000. With respect to the Class A-PO Certificates,  the
minimum  Denomination  eligible for wire transfer on each  Distribution  Date is
100% Percentage  Interest.  The Class A-R, Class B-5 and Class B-6  Certificates
are not eligible for wire transfer.

            SECTION 11.24     SINGLE CERTIFICATE.

            A Single  Certificate for each Class of Class A Certificates  (other
than the Class A-3, Class A-PO and Class A-R Certificates) and each Class of the
Class B  Certificates  (other  than the  Class  B-4,  Class  B-5 and  Class  B-6
Certificates)  represents a $100,000 Denomination.  A Single Certificate for the
Class A-3 Certificates  represents a $1,000  Denomination.  A Single Certificate
for  the  Class  A-R  Certificate  represents  a  $100  Denomination.  A  Single
Certificate for the Class B-4 Certificates represents a $250,000 Denomination. A
Single  Certificate  for the Class  A-PO,  Class B-5 and Class B-6  Certificates
represents  a   $1,663,497.87,   $225,000.00   and   $338,103.87   Denomination,
respectively.

            SECTION 11.25     SERVICING FEE RATE.

            The rate used to calculate  the  Servicing Fee is equal to such rate
as is set forth on the Mortgage Loan Schedule with respect to a Mortgage Loan.

            SECTION 11.26     MASTER SERVICING FEE RATE.

            The  rate  used to  calculate  the  Master  Servicing  Fee for  each
Mortgage Loan is 0.017% per annum.

            SECTION 11.27     AMBAC CONTACT PERSON.

            The  initial  Ambac  Contact  Person  is  Patrick   Greene,   Vice
President of the Seller.


<PAGE>






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

                                    NORWEST ASSET SECURITIES CORPORATION
                                        as Seller

                                    By:
                                       --------------------------------
                                        Name:  Alan S.  McKenney
                                        Title: Vice President


                                    NORWEST BANK MINNESOTA, NATIONAL
                                    ASSOCIATION
                                        as Master Servicer

                                    By:
                                       --------------------------------
                                        Name:  Nancy E.  Burgess
                                        Title: Vice President


                                    FIRST UNION NATIONAL BANK
                                        as Trust Administrator

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

ATTEST:

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

                                    UNITED STATES TRUST COMPANY
                                    OF NEW YORK
                                        as Trustee

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


<PAGE>



STATE OF MARYLAND   )
                    ss.:
COUNTY OF FREDERICK )

            On this 26th day of May, 1999, before me, a notary public in and for
the State of Maryland,  personally  appeared Alan S. McKenney,  known to me who,
being by me duly sworn, did depose and say that he resides at McLean,  Virginia;
that he is a Vice President of Norwest Asset Securities Corporation,  a Delaware
corporation, one of the parties that executed the foregoing instrument; and that
he  signed  his  name  thereto  by  order  of the  Board  of  Directors  of said
corporation.

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

[NOTARIAL SEAL]


<PAGE>



STATE OF MARYLAND   )
                    ss.:
COUNTY OF FREDERICK )

            On this 26th day of May, 1999, before me, a notary public in and for
the State of Maryland,  personally  appeared Nancy E. Burgess,  known to me who,
being by me duly  sworn,  did  depose  and say that she  resides  at  Frederick,
Maryland;  that she is a Vice  President  of Norwest  Bank  Minnesota,  National
Association,  a national banking  association,  one of the parties that executed
the foregoing  instrument;  and that she signed her name thereto by order of the
Board of Directors of said corporation.

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

[NOTARIAL SEAL]


<PAGE>




STATE OF            )
                    ss.:
COUNTY OF           )

            On this 26th day of May, 1999, before me, a notary public in and for
                 ,  personally  appeared                     ,  known to me who,
being  by  me  duly   sworn,   did   depose   and  say  that  s/he   resides  at
                 ,                   ;  that s/he is a                        of
United States Trust Company of New York, a                 ,  one of the parties
that  executed  the  foregoing  instrument;  and that s/he signed  his/her  name
thereto by order of the Board of Directors of said corporation.

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

[NOTARIAL SEAL]


<PAGE>




STATE OF NORTH CAROLINA )
                        ss.:
COUNTY OF               )

            On this 26th day of May, 1999, before me, a notary public in and for
the State of North Carolina, personally appeared                      , known to
me  who,  being  by me duly  sworn,  did  depose  and say  that  he  resides  at
                  ,  North Carolina; that he is a                       of First
Union National  Bank, a national  banking  association,  one of the parties that
executed  the  foregoing  instrument;  and that s/he signed his name  thereto by
order of the Board of Directors of said corporation.

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

[NOTARIAL SEAL]


<PAGE>




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

  [UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
     DEPOSITORY TRUST COMPANY TO THE SELLER 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 THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT IS MADE TO
   CEDE & CO., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE
    BY OR TO ANY PERSON IS WRONGFUL SINCE THE REGISTERED OWNER HEREOF, CEDE &
                          CO., HAS AN INTEREST HEREIN.]

                        MORTGAGE PASS-THROUGH CERTIFICATE
                            SERIES 1999-17 CLASS A-1

                    evidencing an interest in a pool of fixed
                    interest rate, conventional, monthly pay,
                      fully amortizing, first lien, one- to
                four-family residential mortgage loans, which may
                    include loans secured by shares issued by
                    cooperative housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

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

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

CUSIP No.:                              First Distribution Date:  June 25, 1999

Percentage Interest evidenced           Denomination:  $
by this Certificate:       %

Final Scheduled Maturity Date: June 25, 2029

          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 Estate consisting of a pool of fixed interest rate, conventional,  monthly
pay, fully  amortizing,  first lien,  one- to four-family  residential  mortgage
loans,  other than the Fixed Retained Yield, if any, with respect  thereto,  and
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations  (the  "Mortgage  Loans"),   formed  by  Norwest  Asset  Securities
Corporation  (hereinafter called the "Seller", which term includes any successor
entity  under the  Agreement  referred to below).  The Trust  Estate was created
pursuant  to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master  servicer (the "Master  Servicer"),  First Union  National Bank, as trust
administrator (the "Trust  Administrator"),  and the United States Trust Company
of New York, as trustee (the  "Trustee"),  a summary of certain of the pertinent
provisions of which is set forth hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage Interest evidenced by this Certificate and the Class A
Distribution Amount for the Class A-1 Certificates required to be distributed to
Holders of the Class A-1  Certificates  on such  Distribution  Date,  subject to
adjustment in certain  events as specified in the  Agreement.  Distributions  in
reduction of the Principal  Balance of certain  Classes of Class A  Certificates
may not commence on the first  Distribution Date specified above.  Distributions
of principal  will be  allocated  among the Classes of Class A  Certificates  in
accordance with the provisions of the Agreement.  The  pass-through  rate on the
Class A-1 Certificates  applicable to each  Distribution Date will be 6.250% per
annum.  The amount of interest  which accrues on this  Certificate  in any month
will  be  subject  to  reduction  with  respect  to any  Non-Supported  Interest
Shortfall and the interest  portion of certain  Realized Losses allocated to the
Class A-1 Certificates, as described in the Agreement.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer 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 is entitled to receive payments by wire transfer in immediately available
funds in accordance with the Pooling and Servicing Agreement and such Person has
notified the Master  Servicer  pursuant to the Pooling and  Servicing  Agreement
that such  payments  are to be made by wire  transfer of  immediately  available
funds.  Notwithstanding  the above,  the final  distribution in reduction of the
Principal  Balance  of this  Certificate  will 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 Trust  Administrator  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.

          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.

          Unless  this  Certificate  has  been  countersigned  by an  authorized
officer of the Trust Administrator,  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  Trust   Administrator   has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

                                   EXHIBIT A-2
                     [FORM OF FACE OF CLASS A-2 CERTIFICATE]

  [UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
     DEPOSITORY TRUST COMPANY TO THE SELLER 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 THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT IS MADE TO
   CEDE & CO., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE
    BY OR TO ANY PERSON IS WRONGFUL SINCE THE REGISTERED OWNER HEREOF, CEDE &
                          CO., HAS AN INTEREST HEREIN.]

                        MORTGAGE PASS-THROUGH CERTIFICATE
                            SERIES 1999-17 CLASS A-2

                    evidencing an interest in a pool of fixed
                    interest rate, conventional, monthly pay,
                      fully amortizing, first lien, one- to
                four-family residential mortgage loans, which may
                    include loans secured by shares issued by
                    cooperative housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

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

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

CUSIP No.:                              First Distribution Date:  June 25, 1999

Percentage Interest evidenced           Denomination:  $
by this Certificate:       %

Final Scheduled Maturity Date:  June 25, 2029

          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-2  Certificates  with  respect to a
Trust Estate consisting of a pool of fixed interest rate, conventional,  monthly
pay, fully  amortizing,  first lien,  one- to four-family  residential  mortgage
loans,  other than the Fixed Retained Yield, if any, with respect  thereto,  and
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations  (the  "Mortgage  Loans"),   formed  by  Norwest  Asset  Securities
Corporation  (hereinafter called the "Seller", which term includes any successor
entity  under the  Agreement  referred to below).  The Trust  Estate was created
pursuant  to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master  servicer (the "Master  Servicer"),  First Union  National Bank, as trust
administrator (the "Trust  Administrator"),  and the United States Trust Company
of New York, as trustee (the  "Trustee"),  a summary of certain of the pertinent
provisions of which is set forth hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage Interest evidenced by this Certificate and the Class A
Distribution Amount for the Class A-2 Certificates required to be distributed to
Holders of the Class A-2  Certificates  on such  Distribution  Date,  subject to
adjustment in certain  events as specified in the  Agreement.  Distributions  in
reduction of the Principal  Balance of certain  Classes of Class A  Certificates
may not commence on the first  Distribution Date specified above.  Distributions
of principal  will be  allocated  among the Classes of Class A  Certificates  in
accordance with the provisions of the Agreement.  The  pass-through  rate on the
Class A-2 Certificates  applicable to each  Distribution Date will be 6.250% per
annum.  The amount of interest  which accrues on this  Certificate  in any month
will  be  subject  to  reduction  with  respect  to any  Non-Supported  Interest
Shortfall and the interest  portion of certain  Realized Losses allocated to the
Class A-2 Certificates, as described in the Agreement.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer 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 is entitled to receive payments by wire transfer in immediately available
funds in accordance with the Pooling and Servicing Agreement and such Person has
notified the Master  Servicer  pursuant to the Pooling and  Servicing  Agreement
that such  payments  are to be made by wire  transfer of  immediately  available
funds.  Notwithstanding  the above,  the final  distribution in reduction of the
Principal  Balance  of this  Certificate  will 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 Trust  Administrator  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.

          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.

          Unless  this  Certificate  has  been  countersigned  by an  authorized
officer of the Trust Administrator,  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  Trust   Administrator   has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

                                   EXHIBIT A-3
                     [FORM OF FACE OF CLASS A-3 CERTIFICATE]

  [UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
     DEPOSITORY TRUST COMPANY TO THE SELLER 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 THE DEPOSITORY TRUST COMPANY AND ANY PAYMENT IS MADE TO
   CEDE & CO., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE
    BY OR TO ANY PERSON IS WRONGFUL SINCE THE REGISTERED OWNER HEREOF, CEDE &
                          CO., HAS AN INTEREST HEREIN.]

                        MORTGAGE PASS-THROUGH CERTIFICATE
                            SERIES 1999-17 CLASS A-3

                    evidencing an interest in a pool of fixed
                    interest rate, conventional, monthly pay,
                      fully amortizing, first lien, one- to
                four-family residential mortgage loans, which may
                    include loans secured by shares issued by
                    cooperative housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

          THIS  CERTIFICATE  DOES NOT EVIDENCE AN OBLIGATION  OF, OR AN INTEREST
IN, THE SELLER, THE MASTER SERVICER, THE TRUSTEE, THE TRUST ADMINISTRATOR OR ANY
OF THEIR AFFILIATES,  AND IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER
SERVICER, THE TRUSTEE, THE TRUST ADMINISTRATOR OR ANY OF THEIR AFFILIATES, OR BY
ANY GOVERNMENT AGENCY OR (EXCEPT AS PROVIDED HEREIN) PRIVATE INSURER.

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

CUSIP No.:                              First Distribution Date:  June 25, 1999

Percentage Interest evidenced           Denomination:  $
by this Certificate as of the
Cut-Off Date:       %

Final Scheduled Maturity Date:  June 25, 2029

          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-3  Certificates  with  respect to a
Trust Estate consisting of a pool of fixed interest rate, conventional,  monthly
pay, fully  amortizing,  first lien,  one- to four-family  residential  mortgage
loans,  other than the Fixed Retained Yield, if any, with respect  thereto,  and
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations  (the  "Mortgage  Loans"),   formed  by  Norwest  Asset  Securities
Corporation  (hereinafter called the "Seller", which term includes any successor
entity  under the  Agreement  referred to below).  The Trust  Estate was created
pursuant  to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master  servicer (the "Master  Servicer"),  First Union  National Bank, as trust
administrator (the "Trust  Administrator"),  and the United States Trust Company
of New York, as trustee (the  "Trustee"),  a summary of certain of the pertinent
provisions of which is set forth hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage  Interest evidenced by this Certificate and the amount
of  interest  to be  distributed  to Holders of Class A-3  Certificates  on such
Distribution Date as specified in the Agreement. Distributions of principal will
be made to the Holders of the Class A-3  Certificates  as described below and in
the Agreement.  Prior to the Distribution  Date, if any, on which Ambac fails to
make  a  payment   with  respect  to  a  Class  A-3   Distribution   Deficiency,
distributions  in  reduction  of  the  Principal  Balance  of  this  Certificate
(including  amounts  paid in respect of such losses  under the Policy as defined
below) will be made only in lots equal to $1,000 initial  principal  balance and
in accordance  with the  priorities  and procedures set forth in Section 4.07 of
the  Agreement  (i) at the  request of Deceased  Holders  (ii) at the request of
Living  Holders and (iii) by random lot.  On and after such  Distribution  Date,
distributions in reduction of principal  balance will be made as provided in the
Agreement.  Distributions  in  reduction  of the  Principal  Balance  of certain
Classes of Class A Certificates may not commence on the first  Distribution Date
specified above.  Distributions of principal will be allocated among the Classes
of Class A Certificates in accordance with the provisions of the Agreement.  The
pass-through rate on the Class A-3 Certificates  applicable to each Distribution
Date will be 6.750% per  annum.  The amount of  interest  which  accrues on this
Certificate  in any month  will be  subject  to  reduction  with  respect to any
Non-Supported  Interest  Shortfall and the interest  portion of certain Realized
Losses allocated to the Class A-3  Certificates,  as described in the Agreement.
Any  Non-Supported  Interest  Shortfall  allocated to the Class A-3 Certificates
will be covered,  to the extent available,  by funds in the Reserve Fund, to the
extent described in the Agreement and then by the Policy described below.

          The Class A-3  Certificates  will be  entitled  to the  benefits  of a
Financial Guaranty  Insurance Policy issued by Ambac Assurance  Corporation (the
"Policy") to the extent described in the Agreement.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer 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 is entitled to receive payments by wire transfer in immediately available
funds in accordance with the Pooling and Servicing Agreement and such Person has
notified the Master  Servicer  pursuant to the Pooling and  Servicing  Agreement
that such  payments  are to be made by wire  transfer of  immediately  available
funds.  Notwithstanding  the above,  the final  distribution in reduction of the
Principal  Balance  of this  Certificate  will 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 Trust  Administrator  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.

          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.

          Unless  this  Certificate  has  been  countersigned  by an  authorized
officer of the Trust Administrator,  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  Trust   Administrator   has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

                                   EXHIBIT A-4
                     [FORM OF FACE OF CLASS A-4 CERTIFICATE]

                        MORTGAGE PASS-THROUGH CERTIFICATE

                            SERIES 1999-17 CLASS A-4

                    evidencing an interest in a pool of fixed
                    interest rate, conventional, monthly pay,
                      fully amortizing, first lien, one- to
                four-family residential mortgage loans, which may
                    include loans secured by shares issued by
                    cooperative housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

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

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

CUSIP No.:                              First Distribution Date:  June 25, 1999

Percentage Interest evidenced           Denomination:  $
by this Certificate:       %

Final Scheduled Maturity Date:  June 25, 2029

<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-4  Certificates  with  respect to a
Trust Estate consisting of a pool of fixed interest rate, conventional,  monthly
pay, fully  amortizing,  first lien,  one- to four-family  residential  mortgage
loans,  other than the Fixed Retained Yield, if any, with respect  thereto,  and
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations  (the  "Mortgage  Loans"),   formed  by  Norwest  Asset  Securities
Corporation  (hereinafter called the "Seller", which term includes any successor
entity  under the  Agreement  referred to below).  The Trust  Estate was created
pursuant  to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master  servicer (the "Master  Servicer"),  First Union  National Bank, as trust
administrator (the "Trust  Administrator"),  and the United States Trust Company
of New York, as trustee (the  "Trustee"),  a summary of certain of the pertinent
provisions of which is set forth hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage Interest evidenced by this Certificate and the Class A
Distribution Amount for the Class A-4 Certificates required to be distributed to
Holders of the Class A-4  Certificates  on such  Distribution  Date,  subject to
adjustment in certain  events as specified in the  Agreement.  Distributions  in
reduction of the Principal  Balance of certain  Classes of Class A  Certificates
may not commence on the first  Distribution Date specified above.  Distributions
of principal  will be  allocated  among the Classes of Class A  Certificates  in
accordance with the provisions of the Agreement. The Class A-4 Certificates will
not be entitled to distributions in respect of interest.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer 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 is entitled to receive payments by wire transfer in immediately available
funds in accordance with the Pooling and Servicing Agreement and such Person has
notified the Master  Servicer  pursuant to the Pooling and  Servicing  Agreement
that such  payments  are to be made by wire  transfer of  immediately  available
funds.  Notwithstanding  the above,  the final  distribution in reduction of the
Principal  Balance  of this  Certificate  will 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 Trust  Administrator  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.

          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.

          Unless  this  Certificate  has  been  countersigned  by an  authorized
officer of the Trust Administrator,  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  Trust   Administrator   has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

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

          THIS  CERTIFICATE  HAS NOT BEEN AND WILL NOT BE  REGISTERED  UNDER THE
SECURITIES ACT OF 1933, AS AMENDED,  OR THE SECURITIES LAWS OF ANY STATE AND MAY
NOT BE RESOLD OR  TRANSFERRED  UNLESS IT IS REGISTERED  PURSUANT TO SUCH ACT AND
LAWS  OR  IS  SOLD  OR  TRANSFERRED  IN  TRANSACTIONS   WHICH  ARE  EXEMPT  FROM
REGISTRATION UNDER SUCH ACT AND UNDER APPLICABLE STATE LAW AND IS TRANSFERRED IN
ACCORDANCE  WITH THE  PROVISIONS  OF SECTION  5.02 OF THE POOLING AND  SERVICING
AGREEMENT REFERRED TO HEREIN.

          EXCEPT AS  PROVIDED IN SECTION  5.02(C) OF THE  POOLING AND  SERVICING
AGREEMENT  REFERRED  TO HEREIN,  THIS  CERTIFICATE  MAY NOT BE  PURCHASED  BY OR
TRANSFERRED TO ANY PERSON THAT HAS NOT DELIVERED A REPRESENTATION LETTER STATING
THAT  THE  TRANSFEREE  IS NOT AN  EMPLOYEE  BENEFIT  PLAN  OR  OTHER  RETIREMENT
ARRANGEMENT SUBJECT TO TITLE I 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 A 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"), AND IS NOT ACTING ON BEHALF OF OR INVESTING THE ASSETS OF A PLAN.

<PAGE>

                        MORTGAGE PASS-THROUGH CERTIFICATE

                           SERIES 1999-17, CLASS A-PO

                    evidencing an interest in a pool of fixed
           interest rate, conventional, monthly pay, fully amortizing,
           first lien, one- to four-family residential mortgage loans,
                which may include loans secured by shares issued
                  by cooperative housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

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

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

Percentage Interest evidenced           First Distribution Date: June 25, 1999
by this Certificate:       %

Final Scheduled
Maturity Date:  June 25, 2029           Denomination:  $

<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-PO  Certificates  with respect to a
Trust Estate consisting of a pool of fixed interest rate, conventional,  monthly
pay, fully  amortizing,  first lien,  one- to four-family  residential  mortgage
loans,  other than the Fixed Retained Yield, if any, with respect  thereto,  and
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations   (the  "Mortgage   Loans")  formed  by  Norwest  Asset  Securities
Corporation  (hereinafter called the "Seller", which term includes any successor
entity  under the  Agreement  referred to below).  The Trust  Estate was created
pursuant  to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master  servicer (the "Master  Servicer"),  First Union  National Bank, as trust
administrator (the "Trust  Administrator"),  and the United States Trust Company
of New York, as trustee (the  "Trustee"),  a summary of certain of the pertinent
provisions of which is set forth hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage Interest evidenced by this Certificate and the Class A
Distribution  Amount for the Class A-PO Certificates  required to be distributed
to Holders of the Class A-PO Certificates on such Distribution  Date, subject to
adjustment  in certain  events as  specified  in the  Agreement.  The Class A-PO
Certificates will not be entitled to distributions in respect of interest.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer 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 is entitled to receive payments by wire transfer in immediately available
funds in accordance with the Pooling and Servicing Agreement and such Person has
notified the Master  Servicer  pursuant to the Pooling and  Servicing  Agreement
that such  payments  are to be made by wire  transfer of  immediately  available
funds.  Notwithstanding  the above,  the final  distribution in reduction of the
Principal  Balance  of this  Certificate  will 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 Trust  Administrator  for
that purpose in the notice of final distribution.

          No  transfer  of a Class A-PO  Certificate  will be made  unless  such
transfer is exempt from the  registration  requirements of the Securities Act of
1933,  as  amended,  and  any  applicable  state  securities  laws or is made in
accordance  with said Act and laws. In the event that such a transfer is desired
to be made by the Holder hereof,  (i) the transferee will be required to execute
an  investment  letter in the form  described in the  Agreement and (ii) if such
transfer  is to be made  within  three  years  from the later of (a) the date of
initial issuance of the Certificates or (b) the last date on which the Seller or
any  affiliate  thereof  was  a  Holder  of  the  Certificates  proposed  to  be
transferred,  and unless  such  transfer is made in reliance on Rule 144A of the
Securities Act of 1933, as amended,  the Trust  Administrator  or the Seller may
require  the Holder to deliver an opinion of counsel  acceptable  to and in form
and substance  satisfactory to the Trust  Administrator and the Seller that such
transfer is exempt (describing the applicable  exemption and the basis therefor)
from  or is  being  made  pursuant  to  the  registration  requirements  of  the
Securities Act of 1933, as amended,  and of any applicable statute of any state.
The Holder hereof desiring to effect such transfer shall,  and does hereby agree
to,  indemnify  the Trustee,  the Trust  Administrator,  the Seller,  the Master
Servicer,  and any Paying  Agent  acting on behalf of the  Trustee  against  any
liability  that may  result if the  transfer  is not so exempt or is not made in
accordance  with  such  Federal  and state  laws.  In  connection  with any such
transfer, the Trust Administrator will also require (i) a representation letter,
in the form as described in the Agreement,  stating that the transferee is not a
Plan and is not  acting on  behalf  of a Plan or using  the  assets of a Plan to
effect such  purchase or (ii) if such  transferee  is a Plan,  (a) an opinion of
counsel  acceptable  to and in form  and  substance  satisfactory  to the  Trust
Administrator  and the Seller with respect to certain matters and (b) such other
documentation as the Seller or the Master Servicer may require,  as described in
the Agreement.

          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.

          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.

          Unless  this  Certificate  has  been  countersigned  by an  authorized
officer  of the  Trustee  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  Trust   Administrator   has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

                                   EXHIBIT A-R
                     [Form of Face of Class A-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 5.02(d) OF THE POOLING
AND  SERVICING  AGREEMENT,  AND SHALL BE REQUIRED TO FURNISH AN AFFIDAVIT TO THE
TRANSFEROR AND THE TRUST  ADMINISTRATOR  TO THE EFFECT THAT, AMONG OTHER THINGS,
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 A
DISQUALIFIED  ORGANIZATION  OR A  NON-PERMITTED  FOREIGN  HOLDER,  AS DEFINED IN
SECTION  5.02(d) OF THE POOLING AND  SERVICING  AGREEMENT  AND TO HAVE AGREED TO
SUCH  AMENDMENTS  TO THE POOLING AND  SERVICING  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 A-R  CERTIFICATE,  BY ACCEPTANCE  HEREOF,  IS DEEMED TO
HAVE  AGREED TO THE  DESIGNATION  OF THE MASTER  SERVICER AS ITS AGENT TO ACT AS
"TAX  MATTERS  PERSON" OF THE REMIC TO PERFORM THE  FUNCTIONS  OF A "TAX MATTERS
PARTNER" FOR  PURPOSES OF  SUBCHAPTER C OF CHAPTER 63 OF SUBTITLE F OF THE CODE,
OR, IF SO REQUESTED BY THE MASTER SERVICER,  TO ACT AS TAX MATTERS PERSON OF THE
REMIC.

THIS  CERTIFICATE  MAY NOT BE PURCHASED BY OR TRANSFERRED TO ANY PERSON WHICH IS
AN EMPLOYEE BENEFIT PLAN OR OTHER RETIREMENT  ARRANGEMENT  SUBJECT TO TITLE I OF
THE EMPLOYEE  RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED  ("ERISA"),  OR
SECTION 4975 OF THE CODE OR A 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 ACTING ON BEHALF OF OR INVESTING THE ASSETS OF A PLAN.

<PAGE>

                        MORTGAGE PASS-THROUGH CERTIFICATE

                            SERIES 1999-17, CLASS A-R

                    evidencing an interest in a pool of fixed
                    interest rate, conventional, monthly pay,
                      fully amortizing, first lien, one- to
                four-family residential mortgage loans, which may
                    include loans secured by shares issued by
                    cooperative housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

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

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

CUSIP No.:                              First Distribution Date:  June 25, 1999

Percentage Interest evidenced           Denomination:  $100.00
by this Certificate:  100%

Final Scheduled Maturity Date:  June 25, 2029

<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 A-R Certificate with respect to a Trust
Estate consisting of a pool of fixed interest rate,  conventional,  monthly pay,
fully amortizing,  first lien, one- to four-family  residential  mortgage loans,
other than the Fixed Retained Yield, if any, with respect thereto, and which may
include loans secured by shares issued by cooperative housing  corporations (the
"Mortgage Loans"),  formed by Norwest Asset Securities Corporation  (hereinafter
called  the  "Seller",  which  term  includes  any  successor  entity  under the
Agreement referred to below). The Trust Estate was created pursuant to a Pooling
and Servicing  Agreement  dated as of May 26, 1999 (the  "Agreement")  among the
Seller,  Norwest Bank Minnesota,  National Association,  as master servicer (the
"Master  Servicer"),  First Union  National  Bank, as trust  administrator  (the
"Trust  Administrator"),  and the United  States Trust  Company of New York,  as
trustee (the  "Trustee"),  a summary of certain of the  pertinent  provisions of
which  is  set  forth  hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage Interest evidenced by this Certificate and the Class A
Distribution Amount for the Class A-R Certificate  required to be distributed to
the Holder of the Class A-R Certificate on such  Distribution  Date,  subject to
adjustment in certain  events as specified in the  Agreement.  Distributions  in
reduction of the Principal  Balance of certain  Classes of Class A  Certificates
may not commence on the first  Distribution Date specified above.  Distributions
of principal  will be  allocated  among the Classes of Class A  Certificates  in
accordance with the provisions of the Agreement.  The  pass-through  rate on the
Class A-R Certificate  applicable to each  Distribution  Date will be 6.250% per
annum.  The amount of interest  which accrues on this  Certificate  in any month
will  be  subject  to  reduction  with  respect  to any  Non-Supported  Interest
Shortfall and the interest  portion of certain  Realized Losses allocated to the
Class A-R Certificate, as described in the Agreement.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer by check mailed to the address of the Person  entitled  thereto,
as  such  name  and  address   shall   appear  on  the   Certificate   Register.
Notwithstanding  the above,  the final  distribution on this Certificate will 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 Trust Administrator 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.

          Unless  this  Certificate  has  been  countersigned  by an  authorized
officer of the Trust Administrator,  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  Trust   Administrator   has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

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

THIS CERTIFICATE IS SUBORDINATED IN RIGHT OF PAYMENT TO THE CLASS A CERTIFICATES
AND AMBAC AS  DESCRIBED  IN THE  POOLING  AND  SERVICING  AGREEMENT  REFERRED TO
HEREIN.

EXCEPT AS PROVIDED IN SECTION  5.02(C) OF THE  POOLING AND  SERVICING  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  OR  OTHER  RETIREMENT
ARRANGEMENT SUBJECT TO TITLE I 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 A  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"), AND IS NOT ACTING ON BEHALF OF OR INVESTING THE ASSETS
OF A PLAN OR (B)  SUBJECT TO CERTAIN  CONDITIONS  SET FORTH IN THE  POOLING  AND
SERVICING AGREEMENT,  THAT THE SOURCE OF FUNDS USED TO PURCHASE THIS CERTIFICATE
IS AN "INSURANCE COMPANY GENERAL ACCOUNT."

<PAGE>

                        MORTGAGE PASS-THROUGH CERTIFICATE

                            SERIES 1999-17, CLASS B-1

                    evidencing an interest in a pool of fixed
           interest rate, conventional, monthly pay, fully amortizing,
           first lien, one- to four-family residential mortgage loans,
                which may include loans secured by shares issued
                  by cooperative housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

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

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

CUSIP No.:                              First Distribution Date:  June 25, 1999

Percentage Interest evidenced           Denomination:  $
by this Certificate:       %

Final Scheduled Maturity Date:  June 25, 2029

<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 B-1  Certificates  with  respect to a
Trust Estate consisting of a pool of fixed interest rate, conventional,  monthly
pay, fully  amortizing,  first lien,  one- to four-family  residential  mortgage
loans,  other than the Fixed Retained Yield, if any, with respect  thereto,  and
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations   (the  "Mortgage   Loans")  formed  by  Norwest  Asset  Securities
Corporation  (hereinafter called the "Seller", which term includes any successor
entity  under the  Agreement  referred to below).  The Trust  Estate was created
pursuant  to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master  servicer (the "Master  Servicer"),  First Union  National Bank, as trust
administrator (the "Trust  Administrator"),  and the United States Trust Company
of New York, as trustee (the  "Trustee"),  a summary of certain of the pertinent
provisions of which is set forth hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage Interest evidenced by this Certificate and, subject to
the prior  rights  of the Class A  Certificates  and Ambac as  specified  in the
Agreement,  any Class B-1  Distribution  Amount  required to be  distributed  to
Holders of the Class B-1  Certificates  on such  Distribution  Date,  subject to
adjustment,  in certain events, as specified in the Agreement.  The pass-through
rate on the Class B-1 Certificates  applicable to each Distribution Date will be
6.250% per annum.  The amount of interest  which accrues on this  Certificate in
any month  will be  subject  to  reduction  with  respect  to any  Non-Supported
Interest Shortfall and the interest portion of certain Realized Losses allocated
to the Class B-1 Certificates, as described in the Agreement.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer 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 is entitled to receive payments by wire transfer in immediately available
funds in accordance with the Pooling and Servicing Agreement and such Person has
notified the Master  Servicer  pursuant to the Pooling and  Servicing  Agreement
that such  payments  are to be made by wire  transfer of  immediately  available
funds.  Notwithstanding  the above,  the final  distribution in reduction of the
Principal  Balance  of this  Certificate  will 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 Trust  Administrator  for
that purpose in the notice of final distribution.

          No transfer of a Class B-1 Certificate  will be made unless the Holder
hereof   desiring  to  make  any  such  transfer  shall  deliver  to  the  Trust
Administrator  (i) a  representation  letter,  in the form as  described  in the
Agreement,  stating  either  (a)  that the  transferee  is not a Plan and is not
acting on behalf of a Plan or using the assets of a Plan to effect such purchase
or (b) subject to certain conditions described in the Agreement, that the source
of funds used to purchase  this  Certificate  is an "insurance  company  general
account,"  or (ii) if such  transferee  is a Plan,  (a) an  opinion  of  counsel
acceptable to and in form and substance  satisfactory to the Trust Administrator
and the Seller with respect to certain matters and (b) such other  documentation
as the Seller or the Master Servicer may require, as described in the Agreement.

          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.

          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.

          Unless  this  Certificate  has  been  countersigned  by an  authorized
officer of the Trust Administrator,  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  Trust   Administrator   has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

                                   EXHIBIT B-2
                     [FORM OF FACE OF CLASS B-2 CERTIFICATE]

THIS   CERTIFICATE  IS   SUBORDINATED  IN  RIGHT  OF  PAYMENT  TO  THE  CLASS  A
CERTIFICATES,  AMBAC AND THE CLASS B-1  CERTIFICATES AS DESCRIBED IN THE POOLING
AND SERVICING AGREEMENT REFERRED TO HEREIN.

EXCEPT AS PROVIDED IN SECTION  5.02(C) OF THE  POOLING AND  SERVICING  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  OR  OTHER  RETIREMENT
ARRANGEMENT SUBJECT TO TITLE I 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 A  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"), AND IS NOT ACTING ON BEHALF OF OR INVESTING THE ASSETS
OF A PLAN OR (B)  SUBJECT TO CERTAIN  CONDITIONS  SET FORTH IN THE  POOLING  AND
SERVICING AGREEMENT,  THAT THE SOURCE OF FUNDS USED TO PURCHASE THIS CERTIFICATE
IS AN "INSURANCE COMPANY GENERAL ACCOUNT."

<PAGE>

                        MORTGAGE PASS-THROUGH CERTIFICATE

                            SERIES 1999-17, CLASS B-2

            evidencing an interest in a pool of fixed interest rate,
        conventional, monthly pay, fully amortizing, first lien, one- to
                     four-family residential mortgage loans,

                which may include loans secured by shares issued
                  by cooperative housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

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

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

CUSIP No.:                              First Distribution Date:  June 25, 1999

Percentage Interest evidenced           Denomination:  $
by this Certificate:       %

Final Scheduled Maturity Date:  June 25, 2029

<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 B-2  Certificates  with  respect to a
Trust Estate consisting of a pool of fixed interest rate, conventional,  monthly
pay, fully  amortizing,  first lien,  one- to four-family  residential  mortgage
loans,  other than the Fixed Retained Yield, if any, with respect  thereto,  and
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations   (the  "Mortgage   Loans")  formed  by  Norwest  Asset  Securities
Corporation  (hereinafter called the "Seller", which term includes any successor
entity  under the  Agreement  referred to below).  The Trust  Estate was created
pursuant  to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master  servicer (the "Master  Servicer"),  First Union  National Bank, as trust
administrator (the "Trust Administrator") and the United States Trust Company of
New York,  as trustee  (the  "Trustee"),  a summary of certain of the  pertinent
provisions of which is set forth hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage Interest evidenced by this Certificate and, subject to
the prior  rights of the Class A  Certificates,  Ambac and each Class of Class B
Certificates  bearing  a  lower  numerical   designation  as  specified  in  the
Agreement,  any Class B-2  Distribution  Amount  required to be  distributed  to
Holders of the Class B-2  Certificates  on such  Distribution  Date,  subject to
adjustment,  in certain events, as specified in the Agreement.  The pass-through
rate on the Class B-2 Certificates  applicable to each Distribution Date will be
6.250% per annum.  The amount of interest  which accrues on this  Certificate in
any month  will be  subject  to  reduction  with  respect  to any  Non-Supported
Interest Shortfall and the interest portion of certain Realized Losses allocated
to the Class B-2 Certificates, as described in the Agreement.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer 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 is entitled to receive payments by wire transfer in immediately available
funds in accordance with the Pooling and Servicing Agreement and such Person has
notified the Master  Servicer  pursuant to the Pooling and  Servicing  Agreement
that such  payments  are to be made by wire  transfer of  immediately  available
funds.  Notwithstanding  the above,  the final  distribution in reduction of the
Principal  Balance  of this  Certificate  will 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 Trust  Administrator  for
that purpose in the notice of final distribution.

          No transfer of a Class B-2 Certificate  will be made unless the Holder
hereof   desiring  to  make  any  such  transfer  shall  deliver  to  the  Trust
Administrator  (i) a  representation  letter,  in the form as  described  in the
Agreement,  stating  either  (a)  that the  transferee  is not a Plan and is not
acting on behalf of a Plan or using the assets of a Plan to effect such purchase
or (b) subject to certain conditions described in the Agreement, that the source
of funds used to purchase  this  Certificate  is an "insurance  company  general
account,"  or (ii) if such  transferee  is a Plan,  (a) an  opinion  of  counsel
acceptable to and in form and substance  satisfactory to the Trust Administrator
and the Seller with respect to certain matters and (b) such other  documentation
as the Seller or the Master Servicer may require, as described in the Agreement.

          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.

          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.

          Unless  this  Certificate  has  been  countersigned  by an  authorized
officer of the Trust Administrator,  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  Trust   Administrator   has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

                                   EXHIBIT B-3

                     [FORM OF FACE OF CLASS B-3 CERTIFICATE]

THIS   CERTIFICATE  IS   SUBORDINATED  IN  RIGHT  OF  PAYMENT  TO  THE  CLASS  A
CERTIFICATES,  AMBAC,  THE CLASS B-1 CERTIFICATES AND THE CLASS B-2 CERTIFICATES
AS DESCRIBED IN THE POOLING AND SERVICING AGREEMENT REFERRED TO HEREIN.

EXCEPT AS PROVIDED IN SECTION  5.02(C) OF THE  POOLING AND  SERVICING  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  OR  OTHER  RETIREMENT
ARRANGEMENT SUBJECT TO TITLE I 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 A  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"), AND IS NOT ACTING ON BEHALF OF OR INVESTING THE ASSETS
OF A PLAN OR (B)  SUBJECT TO CERTAIN  CONDITIONS  SET FORTH IN THE  POOLING  AND
SERVICING AGREEMENT,  THAT THE SOURCE OF FUNDS USED TO PURCHASE THIS CERTIFICATE
IS AN "INSURANCE COMPANY GENERAL ACCOUNT."

<PAGE>

                        MORTGAGE PASS-THROUGH CERTIFICATE

                            SERIES 1999-17, CLASS B-3

                    evidencing an interest in a pool of fixed
                    interest rate, conventional, monthly pay,

                      fully amortizing, first lien, one- to
                four-family residential mortgage loans, which may

                    include loans secured by shares issued by
                    cooperative housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

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

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

CUSIP No.:                              First Distribution Date:  June 25, 1999

Percentage Interest evidenced           Denomination:  $
by this Certificate:       %

Final Scheduled Maturity Date:  June 25, 2029

<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 B-3  Certificates  with  respect to a
Trust Estate consisting of a pool of fixed interest rate, conventional,  monthly
pay, fully  amortizing,  first lien,  one- to four-family  residential  mortgage
loans,  other than the Fixed Retained Yield, if any, with respect  thereto,  and
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations   (the  "Mortgage   Loans")  formed  by  Norwest  Asset  Securities
Corporation  (hereinafter called the "Seller", which term includes any successor
entity  under the  Agreement  referred to below).  The Trust  Estate was created
pursuant  to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master  servicer (the "Master  Servicer"),  First Union  National Bank, as trust
administrator (the "Trust Administrator") and the United States Trust Company of
New York,  as trustee  (the  "Trustee"),  a summary of certain of the  pertinent
provisions of which is set forth hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage Interest evidenced by this Certificate and, subject to
the prior  rights of the Class A  Certificates,  Ambac and each Class of Class B
Certificates  bearing  a  lower  numerical   designation  as  specified  in  the
Agreement,  any Class B-3  Distribution  Amount  required to be  distributed  to
Holders of the Class B-3  Certificates  on such  Distribution  Date,  subject to
adjustment,  in certain events, as specified in the Agreement.  The pass-through
rate on the Class B-3 Certificates  applicable to each Distribution Date will be
6.250% per annum.  The amount of interest  which accrues on this  Certificate in
any month  will be  subject  to  reduction  with  respect  to any  Non-Supported
Interest Shortfall and the interest portion of certain Realized Losses allocated
to the Class B-3 Certificates, as described in the Agreement.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer 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 is entitled to receive payments by wire transfer in immediately available
funds in accordance with the Pooling and Servicing Agreement and such Person has
notified the Master  Servicer  pursuant to the Pooling and  Servicing  Agreement
that such  payments  are to be made by wire  transfer of  immediately  available
funds.  Notwithstanding  the above,  the final  distribution in reduction of the
Principal  Balance  of this  Certificate  will 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 Trust  Administrator  for
that purpose in the notice of final distribution.

          No transfer of a Class B-3 Certificate  will be made unless the Holder
hereof   desiring  to  make  any  such  transfer  shall  deliver  to  the  Trust
Administrator  (i) a  representation  letter,  in the form as  described  in the
Agreement,  stating  either  (a)  that the  transferee  is not a Plan and is not
acting on behalf of a Plan or using the assets of a Plan to effect such purchase
or (b) subject to certain conditions described in the Agreement, that the source
of funds used to purchase  this  Certificate  is an "insurance  company  general
account,"  or (ii) if such  transferee  is a Plan,  (a) an  opinion  of  counsel
acceptable to and in form and substance  satisfactory to the Trust Administrator
and the Seller with respect to certain matters and (b) such other  documentation
as the Seller or the Master Servicer may require, as described in the Agreement.

          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.

          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.

          Unless  this  Certificate  has  been  countersigned  by an  authorized
officer of the Trust Administrator,  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  Trust   Administrator   has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

                                   EXHIBIT B-4
                     [FORM OF FACE OF CLASS B-4 CERTIFICATE]

THIS   CERTIFICATE  IS   SUBORDINATED  IN  RIGHT  OF  PAYMENT  TO  THE  CLASS  A
CERTIFICATES,  AMBAC, THE CLASS B-1 CERTIFICATES, THE CLASS B-2 CERTIFICATES AND
THE CLASS B-3  CERTIFICATES AS DESCRIBED IN THE POOLING AND SERVICING  AGREEMENT
REFERRED TO HEREIN.

THIS  CERTIFICATE  HAS NOT BEEN AND WILL NOT BE REGISTERED  UNDER THE SECURITIES
ACT OF 1933,  AS  AMENDED,  OR THE  SECURITIES  LAWS OF ANY STATE AND MAY NOT BE
RESOLD OR TRANSFERRED  UNLESS IT IS REGISTERED  PURSUANT TO SUCH ACT AND LAWS OR
IS SOLD OR TRANSFERRED IN TRANSACTIONS  WHICH ARE EXEMPT FROM REGISTRATION UNDER
SUCH ACT AND UNDER  APPLICABLE  STATE LAW AND IS TRANSFERRED IN ACCORDANCE  WITH
THE PROVISIONS OF SECTION 5.02 OF THE POOLING AND SERVICING  AGREEMENT  REFERRED
TO HEREIN.

EXCEPT AS PROVIDED IN SECTION  5.02(C) OF THE  POOLING AND  SERVICING  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  OR  OTHER  RETIREMENT
ARRANGEMENT SUBJECT TO TITLE I 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 A  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"), AND IS NOT ACTING ON BEHALF OF OR INVESTING THE ASSETS
OF A PLAN OR (B)  SUBJECT TO CERTAIN  CONDITIONS  SET FORTH IN THE  POOLING  AND
SERVICING AGREEMENT,  THAT THE SOURCE OF FUNDS USED TO PURCHASE THIS CERTIFICATE
IS AN "INSURANCE COMPANY GENERAL ACCOUNT."

<PAGE>

                        MORTGAGE PASS-THROUGH CERTIFICATE

                            SERIES 1999-17, CLASS B-4

                    evidencing an interest in a pool of fixed
                    interest rate, conventional, monthly pay,

                fully amortizing, first lien, one- to four-family
                  residential mortgage loans, which may include

                  loans secured by shares issued by cooperative

                          housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

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

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

CUSIP No.:                              First Distribution Date:  June 25, 1999

Percentage Interest evidenced           Denomination:  $
by this Certificate:       %

Final Scheduled Maturity Date:  June 25, 2029

<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 B-4  Certificates  with  respect to a
Trust Estate consisting of a pool of fixed interest rate, conventional,  monthly
pay, fully  amortizing,  first lien,  one- to four-family  residential  mortgage
loans,  other than the Fixed Retained Yield, if any, with respect  thereto,  and
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations   (the  "Mortgage   Loans")  formed  by  Norwest  Asset  Securities
Corporation  (hereinafter called the "Seller", which term includes any successor
entity  under the  Agreement  referred to below).  The Trust  Estate was created
pursuant  to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master  servicer (the "Master  Servicer"),  First Union  National Bank, as trust
administrator (the "Trust Administrator") and the United States Trust Company of
New York,  as trustee  (the  "Trustee"),  a summary of certain of the  pertinent
provisions of which is set forth hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage Interest evidenced by this Certificate and, subject to
the prior  rights of the Class A  Certificates,  Ambac and each Class of Class B
Certificates  bearing  a  lower  numerical   designation  as  specified  in  the
Agreement,  any Class B-4  Distribution  Amount  required to be  distributed  to
Holders of the Class B-4  Certificates  on such  Distribution  Date,  subject to
adjustment,  in certain events, as specified in the Agreement.  The pass-through
rate on the Class B-4 Certificates  applicable to each Distribution Date will be
6.250% per annum.  The amount of interest  which accrues on this  Certificate in
any month  will be  subject  to  reduction  with  respect  to any  Non-Supported
Interest Shortfall and the interest portion of certain Realized Losses allocated
to the Class B-4 Certificates, as described in the Agreement.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer 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 is entitled to receive payments by wire transfer in immediately available
funds in accordance with the Pooling and Servicing Agreement and such Person has
notified the Master  Servicer  pursuant to the Pooling and  Servicing  Agreement
that such  payments  are to be made by wire  transfer of  immediately  available
funds.  Notwithstanding  the above,  the final  distribution in reduction of the
Principal  Balance  of this  Certificate  will 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 Trust  Administrator  for
that purpose in the notice of final distribution.

          No  transfer  of a Class  B-4  Certificate  will be made  unless  such
transfer is exempt from the  registration  requirements of the Securities Act of
1933,  as  amended,  and  any  applicable  state  securities  laws or is made in
accordance  with said Act and laws. In the event that such a transfer is desired
to be made by the Holder hereof,  (i) the transferee will be required to execute
an  investment  letter in the form  described in the  Agreement and (ii) if such
transfer  is to be made  within  three  years  from the later of (a) the date of
initial issuance of the Certificates or (b) the last date on which the Seller or
any  affiliate  thereof  was  a  Holder  of  the  Certificates  proposed  to  be
transferred,  and unless  such  transfer is made in reliance on Rule 144A of the
Securities Act of 1933, as amended,  the Trust  Administrator  or the Seller may
require  the Holder to deliver an opinion of counsel  acceptable  to and in form
and substance  satisfactory to the Trust  Administrator and the Seller that such
transfer is exempt (describing the applicable  exemption and the basis therefor)
from  or is  being  made  pursuant  to  the  registration  requirements  of  the
Securities Act of 1933, as amended,  and of any applicable statute of any state.
The Holder hereof desiring to effect such transfer shall,  and does hereby agree
to,  indemnify  the Trustee,  the Trust  Administrator,  the Seller,  the Master
Servicer,  and any  Paying  Agent  acting on  behalf of the Trust  Administrator
against any liability that may result if the transfer is not so exempt or is not
made in accordance with such Federal and state laws. In connection with any such
transfer, the Trust Administrator will also require (i) a representation letter,
in the  form  as  described  in the  Agreement,  stating  either  (a)  that  the
transferee  is not a Plan and is not  acting  on  behalf  of a Plan or using the
assets of a Plan to effect such  purchase  or (b) subject to certain  conditions
described  in the  Agreement,  that the  source of funds used to  purchase  this
Certificate  is  an  "insurance  company  general  account,"  or  (ii)  if  such
transferee  is a Plan,  (a) an opinion of counsel  acceptable to and in form and
substance satisfactory to the Trust Administrator and the Seller with respect to
certain  matters  and (b) such other  documentation  as the Seller or the Master
Servicer may require, as described in the Agreement.

          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.

          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.

          Unless  this  Certificate  has  been  countersigned  by an  authorized
officer of the Trust Administrator,  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  Trust   Administrator   has  caused  this
Certificate to be duly executed as of the date set forth below.

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

                                   EXHIBIT B-5
                     [FORM OF FACE OF CLASS B-5 CERTIFICATE]

THIS   CERTIFICATE  IS   SUBORDINATED  IN  RIGHT  OF  PAYMENT  TO  THE  CLASS  A
CERTIFICATES, AMBAC, THE CLASS B-1 CERTIFICATES, THE CLASS B-2 CERTIFICATES, THE
CLASS B-3  CERTIFICATES  AND THE  CLASS B-4  CERTIFICATES  AS  DESCRIBED  IN THE
POOLING AND SERVICING AGREEMENT REFERRED TO HEREIN.

THIS  CERTIFICATE  HAS NOT BEEN AND WILL NOT BE REGISTERED  UNDER THE SECURITIES
ACT OF 1933,  AS  AMENDED,  OR THE  SECURITIES  LAWS OF ANY STATE AND MAY NOT BE
RESOLD OR TRANSFERRED  UNLESS IT IS REGISTERED  PURSUANT TO SUCH ACT AND LAWS OR
IS SOLD OR TRANSFERRED IN TRANSACTIONS  WHICH ARE EXEMPT FROM REGISTRATION UNDER
SUCH ACT AND UNDER  APPLICABLE  STATE LAW AND IS TRANSFERRED IN ACCORDANCE  WITH
THE PROVISIONS OF SECTION 5.02 OF THE POOLING AND SERVICING  AGREEMENT  REFERRED
TO HEREIN.

EXCEPT AS PROVIDED IN SECTION  5.02(C) OF THE  POOLING AND  SERVICING  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  OR  OTHER  RETIREMENT
ARRANGEMENT SUBJECT TO TITLE I 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 A  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"), AND IS NOT ACTING ON BEHALF OF OR INVESTING THE ASSETS
OF A PLAN OR (B)  SUBJECT TO CERTAIN  CONDITIONS  SET FORTH IN THE  POOLING  AND
SERVICING AGREEMENT,  THAT THE SOURCE OF FUNDS USED TO PURCHASE THIS CERTIFICATE
IS AN "INSURANCE COMPANY GENERAL ACCOUNT."

<PAGE>

                        MORTGAGE PASS-THROUGH CERTIFICATE

                            SERIES 1999-17, CLASS B-5

            evidencing an interest in a pool of fixed interest rate,
        conventional, monthly pay, fully amortizing, first lien, one- to
                     four-family residential mortgage loans,

                which may include loans secured by shares issued
                  by cooperative housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

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

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

CUSIP No.:                              First Distribution Date:  June 25, 1999

Percentage Interest evidenced           Denomination:  $
by this Certificate:       %

Final Scheduled Maturity Date:  June 25, 2029

<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 B-5  Certificates  with  respect to a
Trust Estate consisting of a pool of fixed interest rate, conventional,  monthly
pay, fully  amortizing,  first lien,  one- to four-family  residential  mortgage
loans,  other than the Fixed Retained Yield, if any, with respect  thereto,  and
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations   (the  "Mortgage   Loans")  formed  by  Norwest  Asset  Securities
Corporation  (hereinafter called the "Seller", which term includes any successor
entity  under the  Agreement  referred to below).  The Trust  Estate was created
pursuant  to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master  servicer (the "Master  Servicer"),  First Union  National Bank, as trust
administrator (the "Trust Administrator") and the United States Trust Company of
New York,  as trustee  (the  "Trustee"),  a summary of certain of the  pertinent
provisions of which is set forth hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage Interest evidenced by this Certificate and, subject to
the prior  rights of the Class A  Certificates,  Ambac and each Class of Class B
Certificates  bearing  a  lower  numerical   designation  as  specified  in  the
Agreement,  any Class B-5  Distribution  Amount  required to be  distributed  to
Holders of the Class B-5  Certificates  on such  Distribution  Date,  subject to
adjustment,  in certain events, as specified in the Agreement.  The pass-through
rate on the Class B-5 Certificates  applicable to each Distribution Date will be
6.250% per annum.  The amount of interest  which accrues on this  Certificate in
any month  will be  subject  to  reduction  with  respect  to any  Non-Supported
Interest Shortfall and the interest portion of certain Realized Losses allocated
to the Class B-5 Certificates, as described in the Agreement.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer by check mailed to the address of the Person  entitled  thereto,
as  such  name  and  address   shall   appear  on  the   Certificate   Register.
Notwithstanding  the above, the final distribution in reduction of the Principal
Balance of this  Certificate  will 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 Trust Administrator for that purpose in
the notice of final distribution.

          No  transfer  of a Class  B-5  Certificate  will be made  unless  such
transfer is exempt from the  registration  requirements of the Securities Act of
1933,  as  amended,  and  any  applicable  state  securities  laws or is made in
accordance  with said Act and laws. In the event that such a transfer is desired
to be made by the Holder hereof,  (i) the transferee will be required to execute
an  investment  letter in the form  described in the  Agreement and (ii) if such
transfer  is to be made  within  three  years  from the later of (a) the date of
initial issuance of the Certificates or (b) the last date on which the Seller or
any  affiliate  thereof  was  a  Holder  of  the  Certificates  proposed  to  be
transferred,  and unless  such  transfer is made in reliance on Rule 144A of the
Securities Act of 1933, as amended,  the Trust  Administrator  or the Seller may
require  the Holder to deliver an opinion of counsel  acceptable  to and in form
and substance  satisfactory to the Trust  Administrator and the Seller that such
transfer is exempt (describing the applicable  exemption and the basis therefor)
from  or is  being  made  pursuant  to  the  registration  requirements  of  the
Securities Act of 1933, as amended,  and of any applicable statute of any state.
The Holder hereof desiring to effect such transfer shall,  and does hereby agree
to,  indemnify  the Trustee,  the Trust  Administrator,  the Seller,  the Master
Servicer,  and any  Paying  Agent  acting on  behalf of the Trust  Administrator
against any liability that may result if the transfer is not so exempt or is not
made in accordance with such Federal and state laws. In connection with any such
transfer, the Trust Administrator will also require (i) a representation letter,
in the  form  as  described  in the  Agreement,  stating  either  (a)  that  the
transferee  is not a Plan and is not  acting  on  behalf  of a Plan or using the
assets of a Plan to effect such  purchase  or (b) subject to certain  conditions
described  in the  Agreement,  that the  source of funds used to  purchase  this
Certificate  is  an  "insurance  company  general  account,"  or  (ii)  if  such
transferee  is a Plan,  (a) an opinion of counsel  acceptable to and in form and
substance satisfactory to the Trust Administrator and the Seller with respect to
certain  matters  and (b) such other  documentation  as the Seller or the Master
Servicer may require, as described in the Agreement.

          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.

          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.

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

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

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

                                   EXHIBIT B-6
                     [FORM OF FACE OF CLASS B-6 CERTIFICATE]

THIS   CERTIFICATE  IS   SUBORDINATED  IN  RIGHT  OF  PAYMENT  TO  THE  CLASS  A
CERTIFICATES, AMBAC, THE CLASS B-1 CERTIFICATES, THE CLASS B-2 CERTIFICATES, THE
CLASS  B-3   CERTIFICATES,   THE  CLASS  B-4  CERTIFICATES  AND  THE  CLASS  B-5
CERTIFICATES  AS DESCRIBED IN THE POOLING AND  SERVICING  AGREEMENT  REFERRED TO
HEREIN.

THIS  CERTIFICATE  HAS NOT BEEN AND WILL NOT BE REGISTERED  UNDER THE SECURITIES
ACT OF 1933,  AS  AMENDED,  OR THE  SECURITIES  LAWS OF ANY STATE AND MAY NOT BE
RESOLD OR TRANSFERRED  UNLESS IT IS REGISTERED  PURSUANT TO SUCH ACT AND LAWS OR
IS SOLD OR TRANSFERRED IN TRANSACTIONS  WHICH ARE EXEMPT FROM REGISTRATION UNDER
SUCH ACT AND UNDER  APPLICABLE  STATE LAW AND IS TRANSFERRED IN ACCORDANCE  WITH
THE PROVISIONS OF SECTION 5.02 OF THE POOLING AND SERVICING  AGREEMENT  REFERRED
TO HEREIN.

EXCEPT AS PROVIDED IN SECTION  5.02(C) OF THE  POOLING AND  SERVICING  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  OR  OTHER  RETIREMENT
ARRANGEMENT SUBJECT TO TITLE I 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 A  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"), AND IS NOT ACTING ON BEHALF OF OR INVESTING THE ASSETS
OF A PLAN OR (B)  SUBJECT TO CERTAIN  CONDITIONS  SET FORTH IN THE  POOLING  AND
SERVICING AGREEMENT,  THAT THE SOURCE OF FUNDS USED TO PURCHASE THIS CERTIFICATE
IS AN "INSURANCE COMPANY GENERAL ACCOUNT."

<PAGE>

                        MORTGAGE PASS-THROUGH CERTIFICATE

                            SERIES 1999-17, CLASS B-6

     evidencing an interest in a pool of fixed interest rate, conventional,
         monthly pay, fully amortizing, first lien, one- to four-family
         residential mortgage loans, which may include loans secured by

           shares issued by cooperative housing corporations, sold by

                      NORWEST ASSET SECURITIES CORPORATION
                (Not an interest in or obligation of the Seller)

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

          DISTRIBUTIONS   IN  REDUCTION  OF  THE   PRINCIPAL   BALANCE  OF  THIS
CERTIFICATE  WILL BE MADE IN THE MANNER  DESCRIBED IN THE POOLING AND  SERVICING
AGREEMENT. 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:  May 1, 1999

CUSIP No.:                              First Distribution Date:  June 25, 1999

Percentage Interest evidenced           Denomination:  $
by this Certificate:       %

Final Scheduled Maturity Date:  June 25, 2029

<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 B-6  Certificates  with  respect to a
Trust Estate consisting of a pool of fixed interest rate, conventional,  monthly
pay, fully  amortizing,  first lien,  one- to four-family  residential  mortgage
loans,  other than the Fixed Retained Yield, if any, with respect  thereto,  and
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations   (the  "Mortgage   Loans")  formed  by  Norwest  Asset  Securities
Corporation  (hereinafter called the "Seller", which term includes any successor
entity  under the  Agreement  referred to below).  The Trust  Estate was created
pursuant  to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master  servicer (the "Master  Servicer"),  First Union  National Bank, as trust
administrator (the "Trust Administrator") and the United States Trust Company of
New York,  as trustee  (the  "Trustee"),  a summary of certain of the  pertinent
provisions of which is set forth hereinafter.  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 will be made on
the 25th day of each  month  or,  if such 25th day is not a  Business  Day,  the
Business Day immediately following (the "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,  in an amount equal to the
product of the Percentage Interest evidenced by this Certificate and, subject to
the prior  rights of the Class A  Certificates,  Ambac and each Class of Class B
Certificates  bearing  a  lower  numerical   designation  as  specified  in  the
Agreement,  any Class B-6  Distribution  Amount  required to be  distributed  to
Holders of the Class B-6  Certificates  on such  Distribution  Date,  subject to
adjustment,  in certain events, as specified in the Agreement.  The pass-through
rate on the Class B-6 Certificates  applicable to each Distribution Date will be
6.250% per annum.  The amount of interest  which accrues on this  Certificate in
any month  will be  subject  to  reduction  with  respect  to any  Non-Supported
Interest Shortfall and the interest portion of certain Realized Losses allocated
to the Class B-6 Certificates, as described in the Agreement.

          Distributions  on this  Certificate  will be  made  on  behalf  of the
Trustee  either by the Master  Servicer or by a Paying  Agent  appointed  by the
Master Servicer by check mailed to the address of the Person  entitled  thereto,
as  such  name  and  address   shall   appear  on  the   Certificate   Register.
Notwithstanding  the above, the final distribution in reduction of the Principal
Balance of this  Certificate  will 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 Trust Administrator for that purpose in
the notice of final distribution.

          No  transfer  of a Class  B-6  Certificate  will be made  unless  such
transfer is exempt from the  registration  requirements of the Securities Act of
1933,  as  amended,  and  any  applicable  state  securities  laws or is made in
accordance  with said Act and laws. In the event that such a transfer is desired
to be made by the Holder hereof,  (i) the transferee will be required to execute
an  investment  letter in the form  described in the  Agreement and (ii) if such
transfer  is to be made  within  three  years  from the later of (a) the date of
initial issuance of the Certificates or (b) the last date on which the Seller or
any  affiliate  thereof  was  a  Holder  of  the  Certificates  proposed  to  be
transferred,  and unless  such  transfer is made in reliance on Rule 144A of the
Securities Act of 1933, as amended,  the Trust  Administrator  or the Seller may
require  the Holder to deliver an opinion of counsel  acceptable  to and in form
and substance  satisfactory to the Trust  Administrator and the Seller that such
transfer is exempt (describing the applicable  exemption and the basis therefor)
from  or is  being  made  pursuant  to  the  registration  requirements  of  the
Securities Act of 1933, as amended,  and of any applicable statute of any state.
The Holder hereof desiring to effect such transfer shall,  and does hereby agree
to,  indemnify  the Trustee,  the Trust  Administrator,  the Seller,  the Master
Servicer,  and any  Paying  Agent  acting on  behalf of the Trust  Administrator
against any liability that may result if the transfer is not so exempt or is not
made in accordance with such Federal and state laws. In connection with any such
transfer, the Trust Administrator will also require (i) a representation letter,
in the  form  as  described  in the  Agreement,  stating  either  (a)  that  the
transferee  is not a Plan and is not  acting  on  behalf  of a Plan or using the
assets of a Plan to effect such  purchase  or (b) subject to certain  conditions
described  in the  Agreement,  that the  source of funds used to  purchase  this
Certificate  is  an  "insurance  company  general  account,"  or  (ii)  if  such
transferee  is a Plan,  (a) an opinion of counsel  acceptable to and in form and
substance satisfactory to the Trust Administrator and the Seller with respect to
certain  matters  and (b) such other  documentation  as the Seller or the Master
Servicer may require, as described in the Agreement.

          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.

          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.

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

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

Dated:

                                        First Union National Bank,
                                          Trust Administrator


                                        By:  ___________________________________
                                             Authorized Officer


Countersigned:

First Union National Bank,
  Trust Administrator


By:  ___________________________________
     Authorized Officer

<PAGE>

                                    EXHIBIT C

                [Form of Reverse of Series 1999-17 Certificates]

                      NORWEST ASSET SECURITIES CORPORATION

                       MORTGAGE PASS-THROUGH CERTIFICATES

                                 SERIES 1999-17

          This  Certificate is one of a duly  authorized  issue of  Certificates
issued in several Classes  designated as Mortgage  Pass-Through  Certificates of
the Series specified hereon (herein collectively called the "Certificates").

          The   Certificates   are  limited  in  right  of  payment  to  certain
collections  and  recoveries   respecting  the  Mortgage  Loans,   all  as  more
specifically  set forth  herein  and in the  Agreement.  In the event  funds are
advanced with respect to any Mortgage Loan by a Servicer, the Master Servicer or
the Trust  Administrator,  such advances are reimbursable to such Servicer,  the
Master  Servicer  or the  Trust  Administrator  to the  extent  provided  in the
Agreement, from related recoveries on such Mortgage Loan or from other cash that
would have been distributable to Certificateholders.

          As provided in the Agreement, withdrawals from the Certificate Account
created for the benefit of Certificateholders may be made by the Master Servicer
from time to time for purposes other than  distributions to  Certificateholders,
such purposes including  reimbursement to a Servicer, the Master Servicer or the
Trust  Administrator,  as  applicable,  of advances made by such  Servicer,  the
Master Servicer or the Trust Administrator.

          The Agreement permits,  with certain exceptions therein provided,  the
amendment of the Agreement and the modification of the rights and obligations of
the Seller, the Master Servicer, the Trust Administrator and the Trustee and the
rights of the Certificateholders  under the Agreement at any time by the Seller,
the Master Servicer, the Trust Administrator and the Trustee with the consent of
the Holders of Certificates evidencing in the aggregate not less than 66 2/3% of
the Voting Interests 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 Trust  Administrator,  duly
endorsed by, or  accompanied by an assignment in the form below or other written
instrument of transfer in form  satisfactory to the Trust  Administrator and the
Certificate  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 will 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.

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

          The Seller, the Master Servicer, the Trust Administrator,  the Trustee
and the Certificate Registrar, and any agent of the Seller, the Master Servicer,
the Trust Administrator, the Trustee or the Certificate Registrar, may treat the
Person in whose name this  Certificate is registered as the owner hereof for all
purposes,  and neither the Seller, the Master Servicer, the Trust Administrator,
the Trustee,  the Certificate  Registrar 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 Estate created thereby shall terminate upon the last
action required to be taken by the Trust Administrator on the Final Distribution
Date pursuant to the Agreement following the earlier of (i) the payment or other
liquidation (or advance with respect  thereto) of the last Mortgage Loan subject
thereto or the disposition of all property  acquired upon foreclosure or deed in
lieu of  foreclosure  of any Mortgage  Loan, and (ii) the purchase by the Seller
from the Trust Estate of all remaining  Mortgage Loans and all property acquired
in respect of such Mortgage Loans; provided, however, that the Trust Estate will
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,  living  on the  date  of the
Agreement.  The Agreement permits,  but does not require, the Seller to purchase
all  remaining  Mortgage  Loans and all  property  acquired  in  respect  of any
Mortgage Loan at a price  determined as provided in the Agreement.  The exercise
of such option will effect early  retirement of the  Certificates,  the Seller's
right to exercise  such option  being  subject to the Pool  Scheduled  Principal
Balance  of the  Mortgage  Loans as of the  Distribution  Date  upon  which  the
proceeds of such repurchase are  distributed  being less than ten percent of the
Cut-Off Date Aggregate Principal Balance.

<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  Mortgage   Pass-Through
Certificate and hereby  authorizes the transfer of registration of such interest
to assignee on the Certificate Register of the Trust Estate.

            I (We)  further  direct  the  Certificate  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

<PAGE>

                            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 D

                                    RESERVED



<PAGE>

                                    EXHIBIT E

                               CUSTODIAL AGREEMENT


          THIS  CUSTODIAL  AGREEMENT (as amended and  supplemented  from time to
time, the "Agreement"),  dated as of  _______________,  by and among FIRST UNION
NATIONAL BANK, not individually,  but solely as Trust  Administrator  (including
its successors  under the Pooling and Servicing  Agreement  defined  below,  the
"Trust Administrator"),  NORWEST ASSET SECURITIES CORPORATION (together with any
successor  in  interest,  the  "Seller"),   NORWEST  BANK  MINNESOTA,   NATIONAL
ASSOCIATION  (together  with any  successor in interest or  successor  under the
Pooling and Servicing  Agreement  referred to below, the "Master  Servicer") and
______________________________  (together  with any successor in interest or any
successor appointed hereunder, the "Custodian").


                              W I T N E S S E T H:

          WHEREAS, the Seller, the Master Servicer,  the Trust Administrator and
United States Trust Company of New York, as trustee, have entered into a Pooling
and  Servicing  Agreement  dated as of May 26, 1999  relating to the issuance of
Mortgage Pass-Through Certificates,  Series 1999-17 (as in effect on the date of
this Agreement,  the "Original Pooling and Servicing Agreement",  and as amended
and supplemented from time to time, the "Pooling and Servicing Agreement"); and

          WHEREAS,  the  Custodian  has  agreed  to act as agent  for the  Trust
Administrator  for the purposes of receiving and holding  certain  documents and
other  instruments  delivered  by the Seller  under the  Pooling  and  Servicing
Agreement,  all upon the terms and  conditions  and  subject to the  limitations
hereinafter set forth;

          NOW,  THEREFORE,  in  consideration  of the  premises  and the  mutual
covenants and agreements  hereinafter set forth,  the Trust  Administrator,  the
Seller, the Master Servicer and the Custodian hereby agree as follows:


                                    ARTICLE I

                                   DEFINITIONS

          Capitalized  terms used in this Agreement and not defined herein shall
have the meanings  assigned in the  Original  Pooling and  Servicing  Agreement,
unless otherwise required by the context herein.


                                   ARTICLE II

                          CUSTODY OF MORTGAGE DOCUMENTS

          Section 2.01 CUSTODIAN TO ACT AS AGENT; ACCEPTANCE OF CUSTODIAL FILES.
The Custodian,  as the duly appointed agent of the Trust Administrator for these
purposes,  acknowledges  receipt  of the  Mortgage  Notes,  the  Mortgages,  the
assignments and other documents relating to the Mortgage Loans identified on the
schedule  attached hereto and declares that it holds and will hold such Mortgage
Notes,  Mortgages,  assignments  and other  documents and any similar  documents
received  by  the  Trust  Administrator  subsequent  to  the  date  hereof  (the
"Custodial Files") as agent for the Trust  Administrator,  in trust, for the use
and benefit of all present and future Certificateholders.

          Section  2.02  RECORDATION  OF  ASSIGNMENTS.  If  any  Custodial  File
includes one or more  assignments to the Trust  Administrator  of Mortgage Notes
and related Mortgages that have not been recorded, each such assignment shall be
delivered by the  Custodian to the Seller for the purpose of recording it in the
appropriate  public  office for real  property  records,  and the Seller,  at no
expense to the Custodian, shall promptly cause to be recorded in the appropriate
public office for real property  records each such  assignment and, upon receipt
thereof  from such  public  office,  shall  return each such  assignment  to the
Custodian.

          Section 2.03 REVIEW OF CUSTODIAL FILES. The Custodian agrees,  for the
benefit of  Certificateholders,  to review, in accordance with the provisions of
Section 2.01 of the Pooling and Servicing Agreement,  each Custodial File. If in
performing  the review  required  by this  Section 2.3 the  Custodian  finds any
document or documents  constituting  a part of a Custodial File to be missing or
defective in any material  respect,  the Custodian  shall promptly so notify the
Seller, the Master Servicer and the Trust Administrator.

          Section  2.04   NOTIFICATION  OF  BREACHES  OF   REPRESENTATIONS   AND
WARRANTIES. Upon discovery by the Custodian of a breach of any representation or
warranty  made by the Seller or the Master  Servicer as set forth in the Pooling
and Servicing  Agreement,  the Custodian shall give prompt written notice to the
Seller, the Master Servicer and the Trust Administrator.

          Section 2.05 CUSTODIAN TO COOPERATE;  RELEASE OF CUSTODIAL FILES. Upon
the payment in full of any Mortgage Loan, or the receipt by the Master  Servicer
of a  notification  that payment in full will be escrowed in a manner  customary
for such purposes, the Master Servicer shall immediately notify the Custodian by
a  certification  (which  certification  shall include a statement to the effect
that all amounts  received or to be received  in  connection  with such  payment
which are  required  to be  deposited  in the  Certificate  Account  pursuant to
Section  3.02 of the Pooling  and  Servicing  Agreement  have been or will be so
deposited)  of a  Servicing  Officer  and shall  request  delivery  to it of the
Custodial File. The Custodian  agrees,  upon receipt of such  certification  and
request, promptly to release the related Custodial File to the Master Servicer.

          From time to time as is  appropriate  for the servicing or foreclosure
of any Mortgage  Loan,  the Master  Servicer  shall  deliver to the  Custodian a
certificate of a Servicing  Officer  requesting  that  possession of all, or any
document  constituting  part of, the  Custodial  File be  released to the Master
Servicer and  certifying as to the reason for such release and that such release
will not invalidate any insurance  coverage  provided in respect of the Mortgage
Loan. With such certificate,  the Master Servicer shall deliver to the Custodian
a receipt signed by a Servicing  Officer on behalf of the Master  Servicer,  and
upon receipt of the foregoing, the Custodian shall deliver the Custodial File or
such  document  to the Master  Servicer.  The Master  Servicer  shall cause each
Custodial  File or any  document  therein  so  released  to be  returned  to the
Custodian when the need therefor by the Master Servicer no longer exists, unless
(i) the Mortgage Loan has been liquidated and the Liquidation  Proceeds relating
to the  Mortgage  Loan have been  deposited  in the  Certificate  Account to the
extent  required by the Pooling and  Servicing  Agreement or (ii) the  Custodial
File or such document has been delivered to an attorney,  or to a public trustee
or other  public  official as required by law,  for  purposes of  initiating  or
pursuing legal action or other  proceedings for the foreclosure of the Mortgaged
Property  either  judicially  or  non-judicially,  and the Master  Servicer  has
delivered to the Custodian a certificate of a Servicing Officer certifying as to
the name and address of the Person to which such Custodial File or such document
were delivered and the purpose or purposes of such delivery. In the event of the
liquidation of a Mortgage  Loan,  the Custodian  shall deliver such receipt with
respect thereto to the Master  Servicer upon deposit of the related  Liquidation
Proceeds in the  Certificate  Account to the extent  required by the Pooling and
Servicing Agreement.

          Section 2.06 ASSUMPTION  AGREEMENTS.  In the event that any assumption
agreement or substitution of liability agreement is entered into with respect to
any Mortgage  Loan subject to this  Agreement in  accordance  with the terms and
provisions of the Pooling and Servicing  Agreement,  the Master  Servicer  shall
notify the Custodian  that such  assumption or  substitution  agreement has been
completed by  forwarding  to the  Custodian  the original of such  assumption or
substitution agreement,  which copy shall be added to the related Custodial File
and, for all purposes,  shall be considered a part of such Custodial File to the
same extent as all other documents and instruments  constituting  parts thereof.


                                   ARTICLE III

                            CONCERNING THE CUSTODIAN

          Section 3.01 CUSTODIAN A BAILEE AND AGENT OF THE TRUST  ADMINISTRATOR.
With respect to each Mortgage Note,  Mortgage and other  documents  constituting
each  Custodian  File which are  delivered to the  Custodian,  the  Custodian is
exclusively  the  bailee  and  agent  of the  Trust  Administrator,  holds  such
documents for the benefit of  Certificateholders  and undertakes to perform such
duties and only such  duties as are  specifically  set forth in this  Agreement.
Except upon compliance with the provisions of Section 2.05 of this Agreement, no
Mortgage  Note,  Mortgage or other  document  constituting a part of a Custodial
File shall be delivered by the Custodian to the Seller or the Master Servicer or
otherwise released from the possession of the Custodian. Section

          3.02  INDEMNIFICATION.  The Seller hereby agrees to indemnify and hold
the  Custodian  harmless  from and  against  all  claims,  liabilities,  losses,
actions,  suits or proceedings at law or in equity, or any other expenses,  fees
or charges of any  character or nature,  which the  Custodian  may incur or with
which the  Custodian  may be  threatened  by reasons of its acting as  custodian
under this Agreement, including indemnification of the Custodian against any and
all expenses,  including  attorney's  fees if counsel for the Custodian has been
approved  by the  Seller,  and  the  cost  of  defending  any  action,  suit  or
proceedings  or  resisting  any  claim.  Notwithstanding  the  foregoing,  it is
specifically  understood and agreed that in the event any such claim, liability,
loss,  action,  suit or proceeding or other expense,  fees, or charge shall have
been caused by reason of any negligent act, negligent failure to act, or willful
misconduct  on the part of the  Custodian,  or which shall  constitute a willful
breach of its duties hereunder, the indemnification provisions of this Agreement
shall not apply.

          Section 3.03  CUSTODIAN  MAY OWN  CERTIFICATES.  The  Custodian in its
individual or any other capacity may become the owner or pledgee of Certificates
with the same rights it would have if it were not Custodian.

          Section 3.04 MASTER SERVICER TO PAY CUSTODIAN'S FEES AND EXPENSES. The
Master Servicer  covenants and agrees to pay to the Custodian from time to time,
and the Custodian shall be entitled to, reasonable compensation for all services
rendered by it in the exercise and  performance  of any of the powers and duties
hereunder of the  Custodian,  and the Master  Servicer will pay or reimburse the
Custodian  upon its  request  for all  reasonable  expenses,  disbursements  and
advances  incurred  or made  by the  Custodian  in  accordance  with  any of the
provisions of this  Agreement  (including the  reasonable  compensation  and the
expenses and  disbursements  of its counsel and of all persons not  regularly in
its employ), except any such expense,  disbursement or advance as may arise from
its negligence or bad faith.

          Section 3.05  CUSTODIAN  MAY RESIGN;  TRUST  ADMINISTRATOR  MAY REMOVE
CUSTODIAN.  The  Custodian  may resign from the  obligations  and duties  hereby
imposed upon it as such obligations and duties relate to its acting as Custodian
of the Mortgage  Loans.  Upon  receiving such notice of  resignation,  the Trust
Administrator  shall either take custody of the Custodial  Files itself and give
prompt notice  thereof to the Seller,  the Master  Servicer and the Custodian or
promptly appoint a successor Custodian by written instrument,  in duplicate, one
copy of which instrument  shall be delivered to the resigning  Custodian and one
copy to the successor Custodian. If the Trust Administrator shall not have taken
custody of the  Custodial  Files and no successor  Custodian  shall have been so
appointed and have accepted  resignation,  the resigning  Custodian may petition
any  court  of  competent  jurisdiction  for  the  appointment  of  a  successor
Custodian.

          The Trust  Administrator may remove the Custodian at any time. In such
event, the Trust  Administrator  shall appoint, or petition a court of competent
jurisdiction  to  appoint,  a  successor  Custodian  hereunder.   Any  successor
Custodian  shall  be  a  depository   institution   subject  to  supervision  or
examination by federal or state authority and shall be able to satisfy the other
requirements contained in Section 3.07.

          Any  resignation  or removal of the  Custodian  and  appointment  of a
successor Custodian pursuant to any of the provisions of this Section 3.05 shall
become effective upon acceptance of appointment by the successor Custodian.  The
Trust  Administrator  shall  give  prompt  notice to the  Seller  and the Master
Servicer of the appointment of any successor  Custodian.  No successor Custodian
shall have been appointed and accepted  appointment  by the Trust  Administrator
without the prior approval of the Seller and the Master Servicer.

          Section 3.06 MERGER OR  CONSOLIDATION  OF  CUSTODIAN.  Any Person into
which  the  Custodian  may be  merged  or  converted  or  with  which  it may be
consolidated,   or  any  Person   resulting  from  any  merger,   conversion  or
consolidation to which the Custodian shall be a party, or any Person  succeeding
to the  business  of the  Custodian,  shall be the  successor  of the  Custodian
hereunder,  without the  execution  or filing of any paper or any further act on
the  part  of  any  of the  parties  hereto,  anything  herein  to the  contrary
notwithstanding.

          Section 3.07  REPRESENTATIONS  OF THE CUSTODIAN.  The Custodian hereby
represents  that  it is a  depository  institution  subject  to  supervision  or
examination by a federal or state authority,  has a combined capital and surplus
of at least  $10,000,000 and is qualified to do business in the  jurisdiction in
which it will hold any Custodian File.


                                   ARTICLE IV

                            MISCELLANEOUS PROVISIONS

          Section 4.01 NOTICES. All notices, requests,  consents and demands and
other  communications  required  under this  Agreement  or pursuant to any other
instrument  or document  delivered  hereunder  shall be in writing  and,  unless
otherwise  specifically  provided,  may be delivered personally,  by telegram or
telex,  or by registered or certified  mail,  postage  prepaid,  return  receipt
requested,  at the  addresses  specified on the  signature  page hereof  (unless
changed by the particular party whose address is stated herein by similar notice
in writing), in which case the notice will be deemed delivered when received.

          Section 4.02 AMENDMENTS. No modification or amendment of or supplement
to this Agreement shall be valid or effective  unless the same is in writing and
signed by all parties  hereto,  and neither the Seller,  the Master Servicer nor
the  Trust  Administrator  shall  enter  into any  amendment  hereof  except  as
permitted by the Pooling and Servicing Agreement.  The Trust Administrator shall
give prompt  notice to the  Custodian  of any  amendment  or  supplement  to the
Pooling and Servicing  Agreement and furnish the Custodian  with written  copies
thereof.

          Section 4.03 GOVERNING LAW. This Agreement  shall be deemed a contract
made under the laws of the State of New York and shall be construed and enforced
in accordance with and governed by the laws of the State of New York.

          Section 4.04  RECORDATION  OF  AGREEMENT.  To the extent  permitted by
applicable  law, this  Agreement is subject to  recordation  in all  appropriate
public offices for real property records in all the counties or other comparable
jurisdictions in which any or all of the properties subject to the Mortgages are
situated,  and in any other  appropriate  public  recording office or elsewhere,
such  recordation  to be effected by the Master  Servicer  and at its expense on
direction by the Trust Administrator,  but only upon direction accompanied by an
Opinion  of  Counsel  to  the  effect  that  such  recordation   materially  and
beneficially affects the interests of the Certificateholders.

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

          Section 4.05  SEVERABILITY  OF  PROVISIONS.  If any one or more of the
covenants,  agreements,  provisions or terms of this Agreement  shall be for any
reason whatsoever held invalid, then such covenants,  agreements,  provisions or
terms  shall be  deemed  severable  from the  remaining  covenants,  agreements,
provisions or terms of this Agreement and shall in no way affect the validity or
enforceability  of the other provisions of this Agreement or of the Certificates
or the rights of the holders thereof.

<PAGE>

          IN WITNESS  WHEREOF,  this  Agreement is executed as of the date first
above written.

Address:                                FIRST UNION NATIONAL BANK

230 South Tryon Street
Charlotte, North Carolina  28288        By:     ________________________________
                                        Name:   ________________________________
                                        Title:  ________________________________



Address:                                NORWEST ASSET SECURITIES CORPORATION

7485 New Horizon Way
Frederick, Maryland  21703              By:     ________________________________
                                        Name:   ________________________________
                                        Title:  ________________________________



Address:                                NORWEST ASSET SECURITIES MINNESOTA,
                                        NATIONAL ASSOCIATION

7485 New Horizon Way
Frederick, Maryland 21703               By:     ________________________________
                                        Name:   ________________________________
                                        Title:  ________________________________



Address:                                [CUSTODIAN]


                                        By:     ________________________________
                                        Name:   ________________________________
                                        Title:  ________________________________

<PAGE>

STATE OF                 )
                         : ss.:
COUNTY OF                )


          On this ____ day of ____________,  19__, before me, a notary public in
and for the State of _______________,  personally appeared ____________________,
known to me who,  being by me duly sworn,  did depose and say that he resides at
________________________________________; that he is the ____________________ of
Norwest Asset Securities Corporation a Delaware corporation,  one of the parties
that executed the foregoing  instrument;  and that he signed his name thereto by
order of the Board of Directors of said corporation.


                                        ________________________________________
                                                     Notary Public


[NOTARIAL SEAL]

<PAGE>

STATE OF                 )
                         : ss.:
COUNTY OF                )


          On this ____ day of ____________,  19__, before me, a notary public in
and for the State of _______________,  personally appeared ____________________,
known to me who,  being by me duly sworn,  did depose and say that he resides at
________________________________________;  that  he is  the  _______________  of
Norwest Bank Minnesota,  National  Association,  a national banking association,
one of the parties that  executed the foregoing  instrument;  and that he signed
his name thereto by order of the Board of Directors of said corporation.


                                        ________________________________________
                                                     Notary Public


[NOTARIAL SEAL]

<PAGE>

STATE OF                 )
                         : ss.:
COUNTY OF                )


          On this ____ day of ____________,  19__, before me, a notary public in
and for the State of _______________,  personally appeared ____________________,
known to me who,  being by me duly sworn,  did depose and say that he resides at
________________________________________;  that  he is  the  _______________  of
First Union National Bank, a national  banking  association,  one of the parties
that executed the foregoing  instrument;  and that he signed his name thereto by
order of the Board of Directors of said association.


                                        ________________________________________
                                                     Notary Public


[NOTARIAL SEAL]

<PAGE>

STATE OF                 )
                         : ss.:
COUNTY OF                )


          On this ____ day of  ____________,  19 , before me, a notary public in
and for the State of _______________,  personally appeared ____________________,
known to me who,  being by me duly sworn,  did depose and say that he resides at
________________________________________;  that  he is  the  _______________  of
____________________,  a  _______________,  one of the parties that executed the
foregoing instrument;  and that he signed his name thereto by order of the Board
of Directors of said association.


                                        ________________________________________
                                                     Notary Public


[NOTARIAL SEAL]

<PAGE>

                                   EXHIBIT F-1

            [Schedule of Mortgage Loans Serviced by Norwest Mortgage]



<TABLE>
NASCOR
NMI/1999-17 Exhibit F-1
30 YEAR FIXED RATE RELOCATION LOANS

<CAPTION>
  (i)                          (ii)                        (iii)         (iv)         (v)          (vi)
- --------     ----------------------------------------     --------     --------     --------     ---------
                                                                                      NET
MORTGAGE                                                               MORTGAGE     MORTGAGE      CURRENT
  LOAN                                           ZIP      PROPERTY     INTEREST     INTEREST      MONTHLY
 NUMBER              CITY             STATE     CODE        TYPE         RATE         RATE        PAYMENT
- --------     --------------------     -----     -----     --------     --------     --------     ---------
<S>          <C>                      <C>       <C>       <C>          <C>          <C>          <C>
4747909      CHANHASSEN                MN       55317       SFD         6.250        5.983       $1,908.73
4758224      CLAYTON                   CA       94517       SFD         6.750        6.250       $1,803.43
4772634      ASHBURN                   VA       20147       SFD         7.250        6.250       $1,997.08
4783380      AUSTIN                    TX       78733       SFD         6.875        6.250       $1,765.83
4791274      CHANHASSEN                MN       55317       SFD         7.375        6.250       $2,762.71
4791692      PENN VALLEY               CA       95946       SFD         6.625        6.250       $4,123.61
4791701      AUSTIN                    TX       78733       SFD         6.500        6.233       $1,896.21
4795867      OAKLAND                   NJ       07436       SFD         7.125        6.250       $2,381.60
4815683      ATLANTA                   GA       30327       SFD         6.875        6.250       $2,402.39
4824438      SUGAR LAND                TX       77478       SFD         7.000        6.250       $2,566.08
4825321      CONCORD                   NC       28027       SFD         6.750        6.250       $1,783.65
4826430      SCOTTSDALE                AZ       85259       SFD         7.375        6.250       $2,072.03
4846719      PETALUMA                  CA       94952       SFD         7.250        6.250       $1,797.54
4850631      BOLTON                    MA       01740       SFD         7.125        6.250       $3,685.25
4852706      LONGMONT                  CO       80503       SFD         7.375        6.250       $2,202.22
4853493      JACKSONVILLE              FL       32209       SFD         7.250        6.250       $1,852.11
4870407      THE WOODLANDS             TX       77381       SFD         6.750        6.250       $4,163.36
4876185      SCOTTSDALE                AZ       85255       SFD         6.625        6.250       $2,095.42
4876307      SANTA BARBARA             CA       93109       SFD         7.125        6.250       $2,694.88
4877381      ACTON                     MA       01720       SFD         7.000        6.250       $2,025.85
4880560      JAMISON                   PA       18929       SFD         7.000        6.250       $1,872.83
4884845      CARMEL                    NY       10512       SFD         7.000        6.250       $2,627.28
4886566      CLAYTON                   CA       94517       SFD         6.625        6.250       $1,925.10
4890250      LAWRENCEVILLE             NJ       08648       SFD         6.750        6.250       $1,734.36
4891731      ERIE                      CO       80516       SFD         7.000        6.250       $1,766.05
4893054      GLEN ALLEN                VA       23060       SFD         6.125        5.858       $2,029.42
4896251      FLEMINGTON                NJ       08822       SFD         6.375        6.108       $2,495.48
4901968      SOUTH RIDING              VA       20152       SFD         6.500        6.233       $1,611.78
4908408      SAINT CHARLES             IL       60174       SFD         6.625        6.250       $1,984.97
4913529      CINCINNATI                OH       45244       SFD         6.500        6.233       $2,117.43
4915513      SCARSDALE                 NY       10583       SFD         7.125        6.250       $2,496.13
4918524      LA CANADA                 CA       91011       SFD         6.500        6.233       $1,896.21
4920168      MONTGOMERY                NJ       08502       SFD         7.375        6.250       $1,975.34
4920269      TAMPA                     FL       33609       SFD         6.625        6.250       $1,984.97
4921003      BOYNTON BEACH             FL       33436       SFD         7.125        6.250       $1,683.29
4923555      ALPHARETTA                GA       30004       SFD         7.250        6.250       $1,848.70
4924485      SARATOGA                  CA       95070       SFD         6.500        6.233       $5,530.60
4924623      TUSTIN                    CA       92782       SFD         6.250        5.983       $2,955.45
4926256      GREENWICH                 CT       06830       SFD         6.500        6.233       $3,413.17
4926412      RARITAN TWP               NJ       08822       SFD         6.250        5.983       $2,364.05
4928759      SAN JOSE                  CA       95120       SFD         6.875        6.250       $2,470.06
4929019      SANTA ANA                 CA       92705       SFD         6.500        6.233       $4,108.45
4930067      POTOMAC                   MD       20854       SFD         6.625        6.250       $5,762.80
4931066      SIMI VALLEY               CA       93065       SFD         6.625        6.250       $2,409.82
4931238      ATLANTA                   GA       30327       SFD         6.500        6.233       $2,983.37
4931559      MASON                     OH       45040       SFD         6.750        6.250       $1,718.79
4931726      GREENWICH                 CT       06830       SFD         6.625        6.250       $6,403.11
4931761      ALPHARETTA                GA       30022       SFD         6.625        6.250       $2,049.00
4932350      FRANKLIN                  TN       37069       SFD         6.500        6.233       $1,782.44
4933344      GERMANTOWN                TN       38139       SFD         6.875        6.250       $2,222.40
4933807      MONMOUTH JUNCTION         NJ       08852       SFD         6.750        6.250       $2,165.67
4934587      BERNARDSVILLE             NJ       07924       SFD         6.250        5.983       $4,002.17
4936384      RIDGEFIELD                CT       06877       SFD         6.750        6.250       $6,031.97
4937151      GILROY                    CA       95020       SFD         6.500        6.233       $1,912.01
4937654      HOOVER                    AL       35244       SFD         6.875        6.250       $1,846.96
4937658      GLEN ELLYN                IL       60137       SFD         7.000        6.250       $2,355.18
4938350      CARY                      IL       60013       SFD         6.625        6.250       $2,392.21
4938669      ALPHARETTA                GA       30005       PUD         6.750        6.250       $2,080.71
4939349      MASON                     OH       45040       SFD         6.625        6.250       $1,600.78
4939611      WEST CHESTER              PA       19380       SFD         6.500        6.233       $2,275.45
4940422      ORCHARD LAKE              MI       48324       SFD         6.500        6.233       $1,956.89
4940592      CHESTERFIELD              VA       23838       SFD         6.125        5.858       $1,976.87
4941349      WILDWOOD                  MO       63011       SFD         7.500        6.250       $1,793.49
4942205      RANDOLPH                  NJ       07869       SFD         6.500        6.233       $2,301.05
4943119      ANN ARBOR                 MI       48108       SFD         7.125        6.250       $2,128.96
4948236      SAN MATEO                 CA       94402       SFD         6.375        6.108       $2,994.58
4949023      HOLLISTER                 CA       95023       SFD         6.875        6.250       $2,051.59
4949525      NEW CANAAN                CT       06840       SFD         6.000        5.733       $4,196.86
4949547      SOLON                     OH       44139       SFD         6.750        6.250       $1,816.08
4949582      SCOTTSDALE                AZ       85255       SFD         7.000        6.250       $2,083.73
4949583      MIDDLETOWN                NJ       07748       SFD         6.250        5.983       $1,856.39
4949871      CHATHAM                   NJ       07928       SFD         6.500        6.233       $1,991.02
4950097      OAK HILL                  VA       20171       SFD         6.375        6.108       $3,066.63
4951394      CORAL GABLES              FL       33134       SFD         7.000        6.250       $1,729.79
4952006      RANDOLPH                  NJ       07869       SFD         6.500        6.233       $2,790.27
4952334      STAMFORD                  CT       06903       SFD         6.375        6.108       $2,557.87
4952835      PRINCETON                 NJ       08540       SFD         6.750        6.250       $1,987.31
4952944      SOUTH RIDING              VA       20152       SFD         6.375        6.108       $1,871.61
4953194      SAINT CHARLES             MO       63304       SFD         7.500        6.250       $2,001.16
4953243      BOTHELL                   WA       98012       SFD         7.375        6.250       $2,072.03
4953401      PALO ALTO                 CA       94301       SFD         6.875        6.250       $3,889.02
4953451      VENETIA                   PA       15367       SFD         7.000        6.250       $1,829.59
4953721      MERTON                    WI       53029       SFD         7.000        6.250       $2,146.27
4954074      RESTON                    VA       20191       SFD         6.375        6.108       $1,768.68
4954520      MANDEVILLE                LA       70471       SFD         6.875        6.250       $2,391.23
4954767      MORRISVILLE               NC       27560       SFD         6.875        6.250       $2,217.14
4955106      PALO ALTO                 CA       94306       SFD         6.625        6.250       $2,878.84
4955141      GENEVA                    IL       60134       SFD         6.750        6.250       $1,932.83
4955509      SAN MATEO                 CA       94402       SFD         6.375        6.108       $3,488.69
4955914      PITTSTOWN                 NJ       08867       SFD         6.875        6.250       $2,116.96
4956422      NOBLESVILLE               IN       46060       SFD         7.000        6.250       $2,993.87
4956434      SAN DIEGO                 CA       92130       SFD         7.250        6.250       $2,784.99
4956491      MARIETTA                  GA       30067       SFD         6.625        6.250       $1,767.26
4956690      YARDLEY                   PA       19067       SFD         6.750        6.250       $1,770.68
4956937      NEW YORK                  NY       10021       COP         6.250        5.983       $2,308.94
4957144      FOOTHILL RANCH            CA       92610       SFD         6.750        6.250       $1,899.10
4957788      LOUISVILLE                KY       40245       SFD         6.750        6.250       $1,919.86
4959174      BOSTON                    MA       02118       LCO         6.875        6.250       $1,655.47
4959194      NEW MILFORD               CT       06776       SFD         6.750        6.250       $1,731.76
4959339      ALPHARETTA                GA       30004       SFD         6.125        5.858       $1,701.31
4959371      RIDGEFIELD                CT       06877       SFD         6.500        6.233       $1,946.77
4960271      DOVER                     DE       19901       SFD         7.250        6.250       $1,755.24
4960995      ASHBURN                   VA       20147       SFD         6.250        5.983       $1,583.01
4961223      SAINT CHARLES             IL       60175       SFD         6.875        6.250       $2,125.50
4961673      ATLANTA                   GA       30342       SFD         6.750        6.250       $2,145.57
4961714      POUND RIDGE               NY       10576       SFD         6.250        5.983       $2,770.73
4961733      SANTA CLARITA             CA       91351       SFD         7.250        6.250       $1,978.32
4962028      RIDGEWOOD                 NJ       07450       SFD         6.875        6.250       $2,259.18
4962235      COMMERCE TOWNSHIP         MI       48390       SFD         7.250        6.250       $1,707.15
4962329      SUWANEE                   GA       30024       SFD         7.125        6.250       $2,804.36
4962334      LAKE BARRINGTON           IL       60010       SFD         6.875        6.250       $2,161.30
4962813      SCOTTSDALE                AZ       85260       SFD         6.125        5.858       $2,081.07
4963311      TAMPA                     FL       33613       SFD         7.125        6.250       $2,849.83
4963925      SAN JOSE                  CA       95125       SFD         6.750        6.250       $2,256.80
4964356      SAN JOSE                  CA       95135       SFD         7.125        6.250       $3,163.79
4964381      HUNTINGTON BEACH          CA       92648       PUD         6.750        6.250       $2,231.18
4964442      ROXBURY TOWNSHIP          NJ       07876       SFD         6.875        6.250       $1,678.79
4964470      KENT                      WA       98042       SFD         7.000        6.250       $1,896.12
4965054      SCOTTSDALE                AZ       85331       SFD         7.500        6.250       $1,789.99
4965232      TENAFLY                   NJ       07670       SFD         6.250        5.983       $1,669.83
4965438      AURORA                    CO       80015       SFD         6.500        6.233       $1,972.06
4965960      MABLETON                  GA       30126       SFD         6.000        5.733       $1,649.37
4966197      EAGAN                     MN       55123       SFD         6.750        6.250       $1,686.36
4966349      CHAPEL HILL               NC       27516       SFD         6.875        6.250       $1,990.05
4966553      BOSTON                    MA       02118       LCO         6.500        6.233       $2,692.94
4966597      NEWPORT BEACH             CA       92660       SFD         6.750        6.250       $3,243.00
4966632      FAIRHOPE                  AL       36532       SFD         6.250        5.983       $1,662.44
4966851      HUNTINGTON BEACH          CA       92648       SFD         6.875        6.250       $4,578.80
4966940      LAFAYETTE                 CA       94549       SFD         7.875        6.250       $2,120.83
4967137      HOPEWELL JUNCTION         NY       12533       SFD         6.875        6.250       $1,759.92
4967215      WINDERMERE                FL       34786       SFD         6.625        6.250       $2,356.35
4967499      SUDBURY                   MA       01776       SFD         5.875        5.608       $5,442.15
4967718      FREEHOLD                  NJ       07728       SFD         6.500        6.233       $2,138.92
4968011      DANA POINT                CA       92629       LCO         6.875        6.250       $1,727.73
4968019      KIRKLAND                  WA       98034       SFD         7.125        6.250       $1,870.58
4968036      CONCORD                   CA       94521       SFD         6.625        6.250       $1,632.80
4968229      PLANO                     TX       75093       SFD         7.125        6.250       $2,977.84
4968529      ISSAQUAH                  WA       98029       SFD         6.875        6.250       $1,969.48
4968982      UNION CITY                CA       94587       SFD         6.750        6.250       $2,406.30
4969080      BROOKFIELD                CT       06804       SFD         6.250        5.983       $1,618.11
4969129      LOVELAND                  OH       45140       SFD         6.875        6.250       $1,922.51
4969274      AVON                      CT       06001       SFD         6.875        6.250       $2,299.26
4969290      STERLING                  VA       20165       SFD         6.250        5.983       $2,147.63
4969298      LAGUNA HILLS              CA       92653       SFD         7.125        6.250       $5,810.83
4969329      SHIP BOTTOM               NJ       08008       SFD         6.250        5.983       $1,834.84
4969595      MASON                     OH       45040       SFD         7.000        6.250       $1,908.43
4970439      WESTPORT                  CT       06880       SFD         6.500        6.233       $4,673.52
4970554      POTOMAC                   MD       20854       SFD         6.250        5.983       $2,462.87
4970842      CHADDS FORD               PA       19317       SFD         6.375        6.108       $2,869.81
4971039      SCOTTSDALE                AZ       85259       SFD         6.625        6.250       $2,305.12
4971322      CLARKSON VALLEY           MO       63005       SFD         6.750        6.250       $2,594.40
4971398      WATCHUNG                  NJ       07060       SFD         6.750        6.250       $2,594.40
4971920      FEDERAL WAY               WA       98003       SFD         6.125        5.858       $1,579.79
4972032      PALOS VERDES ESTATES      CA       90274       SFD         5.875        5.608       $3,253.46
4972131      CHAPEL HILL               NC       27514       SFD         6.125        5.858       $1,701.31
4972169      LOS ALTOS                 CA       94024       SFD         6.625        6.250       $4,802.34
4972293      MOUNT AIRY                MD       21771       SFD         6.625        6.250       $1,743.89
4972418      PARK RIDGE                IL       60068       SFD         6.625        6.250       $2,241.09
4972438      RANDOLPH                  NJ       07869       SFD         6.750        6.250       $2,355.71
4972649      SAN JOSE                  CA       95120       SFD         6.625        6.250       $2,497.22
4972798      DUNWOODY                  GA       30338       SFD         7.250        6.250       $1,811.18
4973385      BARRINGTON                IL       60010       SFD         6.125        5.858       $1,798.53
4973573      CLINTON                   NJ       08801       SFD         6.875        6.250       $1,965.86
4973588      CHARLOTTE                 NC       28269       SFD         6.250        5.983       $1,595.94
4973684      ISSAQUAH                  WA       98029       SFD         6.375        6.108       $1,996.08
4973690      LITTLETON                 CO       80127       SFD         6.375        6.108       $2,395.04
4973697      MONROVIA                  CA       91016       SFD         7.375        6.250       $1,958.07
4973708      HIGHLANDS RANCH           CO       80126       SFD         7.250        6.250       $2,043.81
4973740      PALM HARBOR               FL       34685       SFD         6.500        6.233       $2,401.86
4973783      WALNUT CREEK              CA       94598       SFD         6.375        6.108       $3,743.22
4973803      HIGHLANDS RANCH           CO       80126       SFD         6.625        6.250       $1,748.05
4973852      MILLERSVILLE              PA       17551       SFD         6.750        6.250       $2,092.06
4973881      PERINTON                  NY       14450       SFD         6.625        6.250       $2,449.19
4974153      SAN DIEGO                 CA       92131       SFD         6.875        6.250       $2,158.02
4974154      MEDIA                     PA       19063       SFD         6.750        6.250       $2,334.31
4974296      DOYLESTOWN                PA       18901       SFD         6.250        5.983       $1,711.70
4974516      JUPITER                   FL       33458       SFD         6.500        6.233       $2,047.91
4974627      MARIETTA                  GA       30068       SFD         6.875        6.250       $1,807.87
4974660      BLUE BELL                 PA       19422       SFD         6.750        6.250       $2,225.99
4974668      HIGHLANDS RANCH           CO       80126       SFD         6.625        6.250       $1,600.78
4974715      GIBSONIA                  PA       15044       SFD         6.375        6.108       $1,557.18
4974743      NEWTON                    NJ       07860       SFD         7.000        6.250       $1,816.61
4974840      DAVIE                     FL       33330       SFD         6.875        6.250       $1,918.24
4974866      ROCHESTER                 MI       48306       SFD         7.125        6.250       $2,364.42
4974930      CUPERTINO                 CA       95014       SFD         6.250        5.983       $2,166.71
4974949      COLUMBIA                  MD       21044       SFD         6.375        6.108       $1,918.40
4975100      MARIETTA                  GA       30067       SFD         5.875        5.608       $2,247.85
4975251      LOS ALTOS                 CA       94022       SFD         6.500        6.233       $5,530.60
4975626      MIAMI                     FL       33156       SFD         6.625        6.250       $2,241.09
4975713      VICTOR                    NY       14564       SFD         6.375        6.108       $1,871.61
4976281      RICHMOND                  TX       77469       SFD         7.125        6.250       $1,676.55
4976512      GREENWICH                 CT       06830       LCO         6.250        5.983       $1,967.22
4976600      ATLANTA                   GA       30306       SFD         6.625        6.250       $2,391.57
4976695      SANTA CLARITA             CA       91351       SFD         6.750        6.250       $1,692.85
4976719      AUSTIN                    TX       78733       SFD         6.875        6.250       $2,095.61
4976796      SAN JOSE                  CA       95135       SFD         6.750        6.250       $3,092.52
4976919      PROSPECT                  KY       40059       SFD         6.750        6.250       $2,062.55
4977224      MORAGA                    CA       94556       SFD         7.125        6.250       $3,031.74
4977231      DALLAS                    TX       75252       SFD         7.000        6.250       $2,142.28
4977312      WADSWORTH                 IL       60083       SFD         6.750        6.250       $2,270.10
4977358      ALTADENA                  CA       91001       SFD         7.000        6.250       $2,448.32
4977683      ALEXANDRIA                VA       22307       SFD         6.125        5.858       $3,013.75
4977774      SAINT LOUIS               MO       63005       SFD         6.750        6.250       $1,945.80
4977890      MAPLE GROVE               MN       55369       SFD         6.750        6.250       $1,919.86
4977926      REDMOND                   WA       98053       SFD         7.125        6.250       $1,691.04
4978024      WINNETKA                  IL       60093       SFD         6.750        6.250       $6,810.29
4978034      LEAWOOD                   KS       66224       SFD         6.500        6.233       $2,464.75
4978062      PALO ALTO                 CA       94301       LCO         6.875        6.250       $2,128.45
4978131      DANVILLE                  CA       94526       SFD         7.125        6.250       $2,688.48
4978200      CHICAGO                   IL       60613       SFD         6.500        6.233       $2,698.94
4978220      BERNARDSVILLE             NJ       07924       SFD         6.500        6.233       $1,992.28
4978227      PARKTON                   MD       21120       SFD         7.000        6.250       $2,256.71
4978361      GREEN BROOK               NJ       08812       SFD         6.625        6.250       $2,798.16
4978420      WESTFORD                  MA       01886       SFD         6.000        5.733       $1,534.85
4978602      HOUSTON                   TX       77027       SFD         7.125        6.250       $2,122.22
4978629      AGOURA HILLS              CA       91301       SFD         6.750        6.250       $2,360.25
4978669      CLARENCE                  NY       14031       SFD         6.500        6.233       $2,004.29
4978704      SOUTHBURY                 CT       06488       SFD         6.500        6.233       $2,521.96
4978753      LAGUNA BEACH              CA       92651       SFD         6.875        6.250       $3,967.86
4978842      LOVETTSVILLE              VA       20180       SFD         6.625        6.250       $1,604.94
4978866      THOUSAND OAKS             CA       91320       SFD         6.875        6.250       $2,075.90
4979175      NORTHAMPTON               MA       01060       SFD         7.125        6.250       $1,670.83
4979184      POTOMAC                   MD       20854       SFD         7.000        6.250       $1,995.91
4979278      OAKTON                    VA       22124       SFD         6.875        6.250       $1,873.57
4979294      SANTA ROSA                CA       95404       SFD         6.500        6.233       $2,042.22
4979348      PORT WASHINGTON           NY       11050       SFD         6.875        6.250       $1,921.52
4979490      OLD GREENWICH             CT       06870       SFD         6.375        6.108       $4,679.03
4979557      MILLBURN                  NJ       07041       SFD         6.500        6.233       $2,212.24
4979880      MEQUON                    WI       53092       SFD         6.625        6.250       $3,323.22
4979957      MORRISTOWN                NJ       07960       SFD         6.750        6.250       $2,309.01
4980096      MCKINNEY                  TX       75070       SFD         6.500        6.233       $2,746.34
4980168      GAINESVILLE               GA       30506       SFD         6.375        6.108       $1,746.84
4980477      YORKTOWN HEIGHTS          NY       10598       SFD         7.125        6.250       $1,819.05
4980675      WESTPORT                  CT       06880       SFD         6.875        6.250       $4,270.04
4980800      ISSAQUAH                  WA       98027       SFD         6.875        6.250       $2,361.34
4980821      LITTLETON                 CO       80123       SFD         7.000        6.250       $1,682.56
4980863      WESTLAKE VILLAGE          CA       91362       SFD         6.625        6.250       $2,561.25
4980871      HAWTHORN WOODS            IL       60047       SFD         7.000        6.250       $1,916.08
4981045      WESTON                    FL       33327       SFD         7.125        6.250       $2,499.50
4981574      SMYRNA                    GA       30080       SFD         6.125        5.858       $2,114.49
4981641      GLASTONBURY               CT       06033       SFD         6.875        6.250       $2,312.39
4981743      LOVELAND                  CO       80537       SFD         6.500        6.233       $1,056.82
4981850      LAKE ELMO                 MN       55042       SFD         6.750        6.250       $1,915.96
4981893      CINCINNATI                OH       45244       SFD         6.875        6.250       $2,496.33
4981938      KATY                      TX       77450       SFD         6.625        6.250       $2,305.12
4982138      SAN JOSE                  CA       95138       SFD         6.625        6.250       $3,201.56
4982736      PEWEE VALLEY              KY       40056       SFD         6.625        6.250       $2,663.70
4982810      ALPHARETTA                GA       30004       SFD         6.875        6.250       $2,627.72
4982846      MORRISTOWN                NJ       07960       SFD         6.500        6.233       $1,906.32
4982857      DALLAS                    TX       75225       SFD         7.000        6.250       $3,845.45
4983240      PALOS VERDES ESTATES      CA       90274       SFD         7.125        6.250       $5,052.89
4983414      WESTPORT                  CT       06880       SFD         6.875        6.250       $4,270.04
4983430      ALPHARETTA                GA       30201       SFD         6.875        6.250       $2,956.18
4983472      DARIEN                    CT       06403       SFD         6.375        6.108       $6,238.70
4983487      JAMESTOWN                 NC       27282       SFD         6.500        6.233       $1,611.78
4983526      CONCORD                   CA       94521       SFD         6.500        6.233       $1,674.99
4983709      OVERLAND PARK             KS       66221       SFD         6.625        6.250       $1,652.01
4983782      MONUMENT                  CO       80132       SFD         6.750        6.250       $1,621.50
4983798      AURORA                    OH       44202       SFD         6.625        6.250       $1,728.84
4983842      LANCASTER                 PA       17601       SFD         6.500        6.233       $1,668.66
4984035      MORRISVILLE               NC       27560       SFD         7.375        6.250       $2,348.30
4984200      ANN ARBOR                 MI       48108       SFD         6.750        6.250       $2,223.40
4984284      SPRINGFIELD               OR       97478       SFD         6.500        6.233       $1,795.08
4984285      CENTER VALLEY             PA       18034       SFD         6.625        6.250       $1,731.09
4984318      PLEASANTON                CA       94566       SFD         6.625        6.250       $1,709.64
4984323      SARATOGA                  CA       95070       SFD         6.500        6.233       $5,562.20
4984718      SOUTHLAKE                 TX       76092       SFD         6.500        6.233       $2,117.43
4984721      MERCER ISLAND             WA       98040       SFD         6.500        6.233       $3,571.19
4984736      SAN PEDRO                 CA       90732       SFD         6.875        6.250       $2,062.76
4984795      LOS GATOS                 CA       95030       SFD         6.625        6.250       $2,558.69
4984896      NEWTOWN SQUARE            PA       19073       SFD         6.250        5.983       $2,462.87
4985057      CONCORD                   CA       94521       SFD         8.000        6.250       $1,903.02
4985080      KAILUA                    HI       96734       SFD         6.625        6.250       $4,162.03
4985253      LIVINGSTON                NJ       07039       SFD         7.125        6.250       $2,209.80
4985269      RIDGEFIELD                CT       06877       SFD         6.625        6.250       $2,081.02
4985386      OLD SAYBROOK              CT       06475       SFD         6.875        6.250       $1,643.64
4985623      POWELL                    OH       43065       SFD         6.750        6.250       $2,594.40
4985681      AVON                      CT       06001       SFD         6.875        6.250       $2,181.01
4986163      CHESTER                   NJ       07930       SFD         6.375        6.108       $2,667.05
4986199      FLOWER MOUND              TX       75028       SFD         7.125        6.250       $1,873.28
4986279      HOCKESSIN                 DE       19707       SFD         6.875        6.250       $1,623.93
4986395      RANDOLPH                  NJ       07869       SFD         6.500        6.233       $3,387.89
4986560      GERMANTOWN                TN       38138       SFD         6.750        6.250       $1,037.76
4986707      YORBA LINDA               CA       92887       SFD         6.625        6.250       $2,294.88
4986752      DANVILLE                  CA       94526       SFD         6.500        6.233       $1,693.95
4986800      DAKOTA DUNES              SD       57049       SFD         7.125        6.250       $2,021.16
4986833      MOUNTAIN VIEW             CA       94041       SFD         6.750        6.250       $2,628.77
4987134      MARQUETTE                 MI       49855       SFD         6.625        6.250       $1,647.53
4987452      OAKTON                    VA       22124       SFD         6.750        6.250       $1,997.69
4987485      CONCORD                   CA       94521       SFD         6.750        6.250       $1,582.58
4987509      GREAT FALLS               VA       22066       SFD         6.750        6.250       $2,080.71
4987520      WILDWOOD                  MO       63011       PUD         6.875        6.250       $1,692.25
4987672      COTO DE CAZA              CA       92679       SFD         6.000        5.733       $2,098.43
4987704      WILTON                    CT       06897       SFD         6.750        6.250       $3,567.29
4987861      SANDY                     UT       84092       SFD         6.875        6.250       $1,784.22
4987911      BEAUMONT                  TX       77706       SFD         6.875        6.250       $1,742.18
4987949      AUSTIN                    TX       78726       SFD         6.875        6.250       $1,718.86
4988059      FAR HILLS                 NJ       07931       SFD         6.375        6.108       $2,838.61
4988202      FOLSOM                    CA       95630       SFD         6.375        6.108       $2,520.44
4988449      EAST BERNARD              TX       77435       SFD         6.250        5.983       $1,674.76
4988519      DANVILLE                  CA       94526       SFD         6.000        5.733       $2,008.50
4988617      EDEN PRAIRIE              MN       55347       SFD         7.000        6.250       $2,847.50
4988629      WHEATON                   IL       60187       SFD         7.375        6.250       $1,899.36
4988733      SOUTHBURY                 CT       06488       SFD         6.375        6.108       $2,495.48
4988787      BROOKSIDE                 NJ       07926       SFD         6.750        6.250       $1,803.76
4989090      ALPHARETTA                GA       30005       SFD         7.000        6.250       $2,937.98
4989493      WASHINGTON                DC       20016       SFD         7.250        6.250       $2,423.10
4989606      YARDLEY                   PA       19067       SFD         7.500        6.250       $2,013.74
4989686      ROSWELL                   GA       30075       SFD         6.625        6.250       $1,734.61
4990077      RANCHO SANTA MARGARI      CA       92688       SFD         7.375        6.250       $2,001.24
4990423      DAYTON                    OH       45458       SFD         6.875        6.250       $2,128.45
4990440      LAKE IN THE HILLS         IL       60102       SFD         7.125        6.250       $1,724.72
4990456      PENNINGTON                NJ       08534       SFD         6.875        6.250       $2,233.56
4990658      HOOVER                    AL       35216       SFD         6.625        6.250       $2,330.74
4990680      BARRINGTON                IL       60010       SFD         6.750        6.250       $4,151.03
4990769      CAMPBELL                  CA       95008       SFD         7.125        6.250       $2,637.61
4991358      LINCOLN                   NE       68512       SFD         6.875        6.250       $1,629.19
4991555      RIDGEWOOD                 NJ       07450       SFD         6.250        5.983       $3,657.37
4991624      SAN LUIS OBISPO           CA       93401       SFD         7.125        6.250       $2,007.69
4991782      PLEASANTON                CA       94566       SFD         7.000        6.250       $2,661.21
4991844      PALO ALTO                 CA       94306       SFD         6.750        6.250       $2,075.52
4991909      THE WOODLANDS             TX       77381       SFD         7.000        6.250       $1,764.39
4992163      COLLEYVILLE               TX       76034       SFD         6.375        6.108       $1,528.49
4992183      PLEASANTON                CA       94566       SFD         6.375        6.108       $2,557.87
4992291      LARCHMONT                 NY       10538       SFD         6.000        5.733       $1,570.83
4992585      MAITLAND                  FL       32751       SFD         6.750        6.250       $1,945.80
4992771      BELLINGHAM                WA       98225       LCO         6.750        6.250       $1,686.36
4992835      PLEASANTON                CA       94566       SFD         7.250        6.250       $2,592.27
4993129      WHITE PLAINS              NY       10605       SFD         6.500        6.233       $2,085.83
4993326      BROOKEVILLE               MD       20833       SFD         7.125        6.250       $2,981.21
4993365      SAN JOSE                  CA       95112       LCO         6.875        6.250       $1,813.13
4993408      WINDSOR                   CT       06095       SFD         7.250        6.250       $1,931.25
4993454      PLANO                     TX       75024       SFD         7.000        6.250       $1,692.53
4993460      ATLANTA                   GA       30360       SFD         7.625        6.250       $1,831.07
4993733      MOUNT VERNON              IN       47620       SFD         6.875        6.250       $1,192.33
4993906      DOWNINGTOWN               PA       19335       SFD         6.750        6.250       $1,888.72
4994012      RANCHO PALOS VERDES       CA       90275       SFD         6.750        6.250       $2,633.31
4994167      AUSTIN                    TX       78750       SFD         7.125        6.250       $2,662.88
4994189      ASHBURN                   VA       20147       SFD         6.625        6.250       $1,600.78
4994215      WINFIELD                  IL       60190       SFD         6.750        6.250       $2,305.77
4994570      DALLAS                    TX       75206       SFD         7.000        6.250       $1,729.79
4994628      HOUSTON                   TX       77056       SFD         6.875        6.250       $2,135.02
4994641      HOUSTON                   TX       77019       SFD         6.750        6.250       $1,978.23
4994739      ARMONK                    NY       10504       SFD         6.625        6.250       $6,403.11
4994897      CUPERTINO                 CA       95014       SFD         7.250        6.250       $2,728.71
4995097      DANVILLE                  CA       94526       SFD         6.750        6.250       $2,270.10
4995348      SAN FRANCISCO             CA       94114       SFD         6.875        6.250       $3,639.39
4995620      ALPHARETTA                GA       30004       SFD         6.875        6.250       $2,212.21
4995891      BOSTON                    MA       02115       LCO         7.000        6.250       $2,228.77
4995970      CHAPIN                    SC       29036       SFD         6.375        6.108       $1,652.01
4996163      PHOENIXVILLE              PA       19460       SFD         7.000        6.250       $2,528.15
4996263      SEATTLE                   WA       98103       SFD         7.125        6.250       $1,940.31
4996325      GERMANTOWN                TN       38139       SFD         7.000        6.250       $2,195.50
4996405      SCOTTSDALE                AZ       85259       SFD         6.500        6.233       $1,706.59
4996419      AUSTIN                    TX       78730       SFD         7.000        6.250       $1,995.91
4996561      DUNWOODY                  GA       30350       SFD         6.875        6.250       $1,723.79
4997167      THE WOODLANDS             TX       77382       SFD         6.750        6.250       $2,205.24
4997199      HOLDEN                    MA       01520       SFD         7.375        6.250       $1,864.14
4997202      PLEASANTON                CA       94588       SFD         6.625        6.250       $1,664.81
4997621      OAKLAND                   CA       94611       SFD         6.625        6.250       $2,453.16
4997762      RIVERTON                  WY       82501       SFD         7.000        6.250       $1,769.71
4997810      DRAPER                    UT       84020       SFD         6.875        6.250       $1,786.85
4998049      LA HABRA HEIGHTS          CA       90631       SFD         6.875        6.250       $2,233.56
4998087      SAVAGE                    MN       55378       SFD         7.375        6.250       $1,970.85
4998254      KINGWOOD                  TX       77345       PUD         6.750        6.250       $2,464.68
4998477      TAMPA                     FL       33609       SFD         7.125        6.250       $2,459.08
4998564      FLAGSTAFF                 AZ       86004       SFD         6.750        6.250       $1,848.51
4998865      LAS VEGAS                 NV       89135       SFD         7.125        6.250       $1,798.83
4998949      SANTA CLARITA             CA       91350       SFD         7.750        6.250       $2,021.36
4999225      SUWANEE                   GA       30174       SFD         6.750        6.250       $2,334.96
4999295      AGOURA                    CA       91301       SFD         7.125        6.250       $2,155.90
4999361      TAMPA                     FL       33613       SFD         6.750        6.250       $3,142.46
4999562      DAKOTA DUNES              SD       57049       SFD         7.125        6.250       $2,182.85
4999639      DANVILLE                  CA       94506       SFD         6.500        6.233       $2,970.72
4999833      KENT                      WA       98042       SFD         7.500        6.250       $1,887.88
5000012      WESTLAKE VILLAGE          CA       91362       SFD         6.875        6.250       $3,074.43
5000465      WESTLAKE VILLAGE          CA       91361       SFD         6.500        6.233       $1,714.17
5000475      DOVE CANYON               CA       92679       SFD         7.125        6.250       $1,994.21
5000511      THOUSAND OAKS             CA       91320       SFD         6.500        6.233       $3,309.20
5000707      ESCONDIDO                 CA       92029       SFD         6.500        6.233       $1,896.21
5000907      PHOENIX                   AZ       85045       SFD         6.500        6.233       $1,896.21
5001014      WEST CHESTER              PA       19382       SFD         6.375        6.108       $2,121.16
5001026      SCOTTSDALE                AZ       85259       SFD         6.375        6.108       $3,119.35
5001446      AURORA                    CO       80015       SFD         6.625        6.250       $1,888.92
5001558      SAN DIEGO                 CA       92128       PUD         7.000        6.250       $1,946.01
5001989      WASHINGTON                DC       20005       LCO         7.000        6.250       $2,070.43
5002444      PLANO                     TX       75093       SFD         6.875        6.250       $2,154.73
5002462      THE WOODLANDS             TX       77381       PUD         6.750        6.250       $2,231.18
5002690      SAN MATEO                 CA       94403       SFD         6.625        6.250       $3,483.30
5002916      SATELLITE BEACH           FL       32937       SFD         6.500        6.233       $2,270.39
5002997      HOUSTON                   TX       77059       SFD         6.875        6.250       $2,186.86
5003279      SIMI VALLEY               CA       93065       SFD         6.625        6.250       $2,953.12
5003404      LITTLETON                 CO       80120       SFD         6.625        6.250       $1,664.81
5003617      LARKSPUR                  CA       94939       SFD         6.875        6.250       $2,233.56
5004275      ENCINITAS                 CA       92007       SFD         6.625        6.250       $2,721.33
5004334      DOVE CANYON               CA       92679       SFD         6.625        6.250       $2,458.29
5004804      SUNNYVALE                 CA       94087       SFD         6.750        6.250       $2,334.96
5004869      CONCORD                   CA       94518       SFD         7.250        6.250       $1,757.29
5004930      ROCHESTER HILLS           MI       48306       SFD         6.500        6.233       $2,002.40
5005468      DAYTON                    OH       45459       SFD         6.750        6.250       $1,660.42
5005494      LOVELAND                  OH       45140       SFD         6.875        6.250       $1,747.44
5006134      WINDERMERE                FL       34786       SFD         6.875        6.250       $1,970.79
5006389      FAIR OAKS                 CA       95628       SFD         6.875        6.250       $2,254.58
5006420      MARIETTA                  GA       30066       SFD         6.375        6.108       $1,873.80
5006790      CARMEL                    IN       46032       SFD         7.250        6.250       $1,746.38
5007039      MILL VALLEY               CA       94941       SFD         6.375        6.108       $2,807.42
5007247      IRVINE                    CA       92604       SFD         7.000        6.250       $1,806.97
5007833      MCKINNEY                  TX       75070       SFD         6.500        6.233       $1,740.09
5008056      OVERLAND PARK             KS       66221       SFD         6.750        6.250       $2,490.62
5008399      HOPKINTON                 MA       01748       LCO         6.750        6.250       $1,634.47
5008542      SCOTTSDALE                AZ       85259       SFD         6.500        6.233       $1,731.87
5008606      CAMARILLO                 CA       93012       SFD         7.000        6.250       $1,889.46
5008813      NEW ROCHELLE              NY       10804       SFD         7.125        6.250       $2,576.98
5009133      SHINGLE SPRINGS           CA       95682       SFD         6.625        6.250       $1,680.18
5009881      MISSION VIEJO             CA       92692       SFD         6.000        5.733       $2,230.33
5012676      SAUSALITO                 CA       94965       LCO         6.750        6.250       $1,914.67
5013503      THOUSAND OAKS             CA       91362       SFD         7.125        6.250       $1,920.10
5013655      CHESTERFIELD              VA       23838       SFD         6.875        6.250       $1,754.00
5014013      PHOENIX                   AZ       85044       SFD         6.375        6.108       $1,721.89
5014548      STAMFORD                  CT       06903       SFD         7.000        6.250       $2,860.81
5015635      DALLAS                    TX       75230       SFD         7.000        6.250       $3,775.93
5017403      FAIRVIEW                  TX       75069       SFD         7.000        6.250       $2,993.87
5018674      OAK RIDGE                 NC       27310       SFD         7.000        6.250       $2,059.78
5019242      BROOMFIELD                CO       80020       SFD         6.750        6.250       $2,060.28
6938244      WILMINGTON                NC       28411       SFD         6.375        6.108       $2,401.90
7540463      LIVERMORE                 CA       94550       SFD         7.250        6.250       $1,925.78
7594032      SHARON                    MA       02067       SFD         7.125        6.250       $2,748.77
7626167      LIVERMORE                 CA       94550       SFD         7.250        6.250       $1,816.72
7641976      ATLANTA                   GA       30328       PUD         7.000        6.250       $2,521.56
7706721      COLLEYVILLE               TX       76034       SFD         6.500        6.233       $1,896.20

<PAGE>

NASCOR
NMI/1999-17 Exhibit F-1
30 YEAR FIXED RATE RELOCATION LOANS
(continued)

<CAPTION>
  (i)         (vii)        (viii)            (ix)            (x)       (xi)         (xii)       (xiii)
- --------     --------     ---------     ---------------     -----     -------     ---------     -------
                                            CUT-OFF
MORTGAGE     ORIGINAL     SCHEDULED          DATE                                 MORTGAGE
  LOAN       TERM TO      MATURITY         PRINCIPAL                              INSURANCE     SERVICE
 NUMBER      MATURITY       DATE            BALANCE          LTV      SUBSIDY       CODE          FEE
- --------     --------     ---------     ---------------     -----     -------     ---------     -------
<S>          <C>          <C>           <C>                 <C>       <C>         <C>           <C>
4747909        360        1-Nov-28          $308,211.97     78.28                                0.250
4758224        360        1-Oct-28          $276,345.66     73.61     GD 8YR                     0.250
4772634        360        1-Apr-29          $292,521.62     89.99                                0.250
4783380        360        1-May-29          $268,800.00     80.00                                0.250
4791274        360        1-May-29          $400,000.00     88.78                    33          0.250
4791692        360        1-Oct-28          $639,956.16     80.00     GD 8YR                     0.250
4791701        360        1-May-29          $300,000.00     66.27                                0.250
4795867        360        1-May-29          $353,500.00     89.96     GD 3YR                     0.250
4815683        360        1-Sep-28          $363,192.28     90.00                    11          0.250
4824438        360        1-May-29          $385,700.00     80.00                                0.250
4825321        360        1-May-29          $275,000.00     74.15                                0.250
4826430        360        1-Apr-29          $299,771.72     93.97                                0.250
4846719        360        1-Apr-29          $263,294.44     85.00     GD 6YR         11          0.250
4850631        360        1-May-29          $547,000.00     79.99                                0.250
4852706        360        1-May-29           $38,850.00     89.99                                0.250
4853493        360        1-May-29          $271,500.00     95.00                                0.250
4870407        360        1-May-29          $641,900.00     70.00                                0.250
4876185        360        1-May-29          $327,250.00     85.00                                0.250
4876307        360        1-May-29          $400,000.00     40.00                                0.250
4877381        360        1-May-29          $304,500.00     75.28                                0.250
4880560        360        1-May-29          $281,500.00     79.99                                0.250
4884845        360        1-Jan-29          $393,593.84     84.99                                0.250
4886566        360        1-Apr-29          $300,384.74     70.00     GD 4YR                     0.250
4890250        360        1-May-29          $267,400.00     94.99                    17          0.250
4891731        360        1-May-29          $265,450.00     79.68                                0.250
4893054        360        1-May-29          $334,000.00     69.85                                0.250
4896251        360        1-May-29          $400,000.00     75.47                                0.250
4901968        360        1-Apr-29          $254,769.47     72.35                                0.250
4908408        360        1-May-29          $310,000.00     66.67                                0.250
4913529        360        1-May-29          $335,000.00     62.50                                0.250
4915513        360        1-Apr-29          $370,203.71     95.00                                0.250
4918524        360        1-May-29          $300,000.00     46.66                                0.250
4920168        360        1-Apr-29          $285,782.37     93.57                                0.250
4920269        360        1-May-29          $310,000.00     65.26                                0.250
4921003        360        1-Jan-29          $249,043.62     80.00                                0.250
4923555        360        1-May-29          $271,000.00     80.00                                0.250
4924485        360        1-Apr-29          $874,208.98     59.32                                0.250
4924623        360        1-Apr-29          $478,381.15     80.00                                0.250
4926256        360        1-Apr-29          $539,511.83     90.00                    17          0.250
4926412        360        1-Apr-29          $383,585.69     73.13     GD 5YR                     0.250
4928759        360        1-Apr-29          $375,684.11     80.00                                0.250
4929019        360        1-Apr-29          $649,412.38     60.75                                0.250
4930067        360        1-Jan-29          $896,684.57     61.75                                0.250
4931066        360        1-May-29          $376,350.00     79.00                                0.250
4931238        360        1-Apr-29          $471,573.30     80.00                                0.250
4931559        360        1-May-29          $265,000.00     89.73                                0.250
4931726        360        1-Mar-29          $998,230.57     86.96                    17          0.250
4931761        360        1-May-29          $320,000.00     72.09                                0.250
4932350        360        1-Apr-29          $281,745.06     80.00     GD 3YR                     0.250
4933344        360        1-Apr-29          $338,015.78     85.00                    11          0.250
4933807        360        1-May-29          $333,900.00     90.00     GD 3YR         11          0.250
4934587        360        1-Apr-29          $649,383.25     67.36                                0.250
4936384        360        1-Mar-29          $928,394.06     69.77     GD 3YR                     0.250
4937151        360        1-May-29          $302,500.00     79.99     GD 3YR                     0.250
4937654        360        1-Apr-29          $280,913.80     95.00                                0.250
4937658        360        1-Apr-29          $353,709.82     80.00     GD 5YR                     0.250
4938350        360        1-May-29          $373,600.00     80.00                                0.250
4938669        360        1-May-29          $320,800.00     72.39                                0.250
4939349        360        1-Feb-29          $249,334.63     51.55                                0.250
4939611        360        1-Apr-29          $359,674.55     80.00                                0.250
4940422        360        1-Apr-29          $309,320.11     89.89                                0.250
4940592        360        1-May-29          $325,350.00     80.00                                0.250
4941349        360        1-Apr-29          $256,309.64     95.00                                0.250
4942205        360        1-May-29          $364,050.00     80.00                                0.250
4943119        360        1-May-29          $316,000.00     88.02                                0.250
4948236        360        1-Apr-29          $479,555.42     80.00                                0.250
4949023        360        1-Apr-29          $312,037.63     90.02                                0.250
4949525        360        1-Apr-29          $699,303.14     43.89                                0.250
4949547        360        1-Apr-29          $279,758.92     80.00                                0.250
4949582        360        1-Apr-29          $312,943.27     90.00                                0.250
4949583        360        1-May-29          $301,500.00     90.00                    17          0.250
4949871        360        1-Apr-29          $314,715.23     50.00                                0.250
4950097        360        1-Dec-28          $489,249.32     79.99                                0.250
4951394        360        1-Apr-29          $259,786.88     80.00                                0.250
4952006        360        1-May-29          $441,450.00     80.00                                0.250
4952334        360        1-Apr-29          $409,620.26     89.13                    17          0.250
4952835        360        1-May-29          $306,400.00     80.00     GD 3YR                     0.250
4952944        360        1-May-29          $300,000.00     75.28                                0.250
4953194        360        1-May-29          $286,200.00     90.00                                0.250
4953243        360        1-May-29          $300,000.00     84.68                                0.250
4953401        360        1-Apr-29          $591,502.65     80.00                                0.250
4953451        360        1-Apr-29          $274,774.58     85.96                                0.250
4953721        360        1-Apr-29          $322,335.56     79.26                                0.250
4954074        360        1-May-29          $283,500.00     90.00                                0.250
4954520        360        1-Apr-29          $363,694.19     80.00                                0.250
4954767        360        1-Apr-29          $337,216.45     90.00                                0.250
4955106        360        1-Apr-29          $449,203.33     80.00                                0.250
4955141        360        1-Apr-29          $297,743.42     87.65     GD 3YR         11          0.250
4955509        360        1-May-29          $559,200.00     80.00                                0.250
4955914        360        1-Apr-29          $321,979.26     90.00                                0.250
4956422        360        1-May-29          $450,000.00     63.83                                0.250
4956434        360        1-May-29          $408,250.00     84.99                                0.250
4956491        360        1-May-29          $276,000.00     78.63                                0.250
4956690        360        1-Apr-29          $272,764.95     70.00                                0.250
4956937        360        1-Apr-29          $374,644.18     75.00                                0.250
4957144        360        1-Apr-29          $292,547.90     80.00                                0.250
4957788        360        1-Apr-29          $295,745.14     80.00                                0.250
4959174        360        1-Apr-29          $251,788.28     80.00                                0.250
4959194        360        1-May-29          $267,000.00     74.17                                0.250
4959339        360        1-Apr-29          $279,727.86     67.96                                0.250
4959371        360        1-May-29          $308,000.00     80.00                                0.250
4960271        360        1-May-29          $257,300.00     90.00                    11          0.250
4960995        360        1-May-29          $257,100.00     94.69                                0.250
4961223        360        1-Apr-29          $323,278.17     90.00                    11          0.250
4961673        360        1-Apr-29          $330,515.18     51.77                                0.250
4961714        360        1-Apr-29          $449,573.02     53.00                                0.250
4961733        360        1-Apr-29          $289,773.76     89.74                                0.250
4962028        360        1-May-29          $343,900.00     80.00                                0.250
4962235        360        1-May-29          $250,250.00     92.59                                0.250
4962329        360        1-Apr-29          $415,917.12     90.00                                0.250
4962334        360        1-May-29          $329,000.00     68.68                                0.250
4962813        360        1-Apr-29          $342,167.11     69.54                                0.250
4963311        360        1-May-29          $423,000.00     90.00                                0.250
4963925        360        1-May-29          $347,950.00     80.00                                0.250
4964356        360        1-Apr-29          $469,224.46     80.00                                0.250
4964381        360        1-May-29          $344,000.00     80.00                                0.250
4964442        360        1-Apr-29          $255,335.30     95.00     GD 3YR                     0.250
4964470        360        1-Apr-29          $284,766.38     95.00                    11          0.250
4965054        360        1-Apr-29          $255,785.51     80.00                                0.250
4965232        360        1-Apr-29          $270,942.67     80.00                                0.250
4965438        360        1-May-29          $312,000.00     80.00                                0.250
4965960        360        1-May-29          $275,100.00     80.00                                0.250
4966197        360        1-Apr-29          $259,776.14     80.00                                0.250
4966349        360        1-Apr-29          $302,677.50     78.09                                0.250
4966553        360        1-May-29          $426,051.00     80.00                                0.250
4966597        360        1-Apr-29          $499,569.50     63.69                                0.250
4966632        360        1-May-29          $270,000.00     69.59                                0.250
4966851        360        1-May-29          $697,000.00     85.00                                0.250
4966940        360        1-Apr-29          $292,298.70     90.00     GD 3YR                     0.250
4967137        360        1-Apr-29          $267,674.92     79.99     GD 3YR                     0.250
4967215        360        1-May-29          $368,000.00     80.00                                0.250
4967499        360        1-Apr-29          $919,062.02     80.00                                0.250
4967718        360        1-Apr-29          $338,094.08     80.00                                0.250
4968011        360        1-May-29          $263,000.00     89.76                                0.250
4968019        360        1-May-29          $277,650.00     90.00                                0.250
4968036        360        1-May-29          $255,000.00     73.91                                0.250
4968229        360        1-May-29          $442,000.00     80.00                                0.250
4968529        360        1-Mar-29          $299,294.80     79.95                                0.250
4968982        360        1-May-29          $371,000.00     67.64                                0.250
4969080        360        1-Apr-29          $262,550.64     90.00                    11          0.250
4969129        360        1-May-29          $292,650.00     90.00                                0.250
4969274        360        1-May-29          $350,000.00     62.84                                0.250
4969290        360        1-Apr-29          $348,469.04     80.00                                0.250
4969298        360        1-Apr-29          $861,810.26     75.00     GD 4YR                     0.250
4969329        360        1-Mar-29          $297,433.02     79.89                                0.250
4969595        360        1-May-29          $286,850.00     80.00                                0.250
4970439        360        1-May-29          $739,400.00     79.94                                0.250
4970554        360        1-Apr-29          $399,620.46     57.84                                0.250
4970842        360        1-Apr-29          $459,573.94     80.00                                0.250
4971039        360        1-Apr-29          $359,682.38     79.00                                0.250
4971322        360        1-Apr-29          $399,655.60     45.98                                0.250
4971398        360        1-May-29          $400,000.00     80.00                                0.250
4971920        360        1-Apr-29          $259,747.29     67.53                                0.250
4972032        360        1-May-29          $550,000.00     66.67                                0.250
4972131        360        1-Apr-29          $279,727.86     61.67                                0.250
4972169        360        1-Apr-29          $749,338.28     74.85     GD 4YR                     0.250
4972293        360        1-May-29          $272,350.00     94.99     GD 3YR                     0.250
4972418        360        1-Apr-29          $349,691.20     66.67                                0.250
4972438        360        1-May-29          $363,200.00     80.00                                0.250
4972649        360        1-May-29          $390,000.00     69.03                                0.250
4972798        360        1-May-29          $265,500.00     90.00                                0.250
4973385        360        1-May-29          $296,000.00     80.00                                0.250
4973573        360        1-May-29          $299,250.00     90.00                                0.250
4973588        360        1-Apr-29          $258,954.06     90.00     GD 3YR         06          0.250
4973684        360        1-May-29          $319,950.00     64.64                                0.250
4973690        360        1-May-29          $383,900.00     80.00                                0.250
4973697        360        1-Apr-29          $283,284.27     90.00     GD 6YR         33          0.250
4973708        360        1-May-29          $299,600.00     89.99     GD 3YR                     0.250
4973740        360        1-May-29          $380,000.00     67.98                                0.250
4973783        360        1-Apr-29          $599,444.28     72.29                                0.250
4973803        360        1-Apr-29          $272,674.85     94.79                                0.250
4973852        360        1-May-29          $322,550.00     80.00                                0.250
4973881        360        1-Apr-29          $382,162.53     90.00                                0.250
4974153        360        1-Apr-29          $328,224.01     90.00                                0.250
4974154        360        1-May-29          $359,900.00     80.00                                0.250
4974296        360        1-May-29          $278,000.00     77.46                                0.250
4974516        360        1-Apr-29          $323,707.09     80.00                                0.250
4974627        360        1-Apr-29          $274,968.80     80.00                                0.250
4974660        360        1-Apr-29          $342,904.51     80.00                                0.250
4974668        360        1-Apr-29          $249,779.43     87.13                                0.250
4974715        360        1-Apr-29          $249,368.82     80.00                                0.250
4974743        360        1-May-29          $273,050.00     71.28                                0.250
4974840        360        1-May-29          $292,000.00     79.78                                0.250
4974866        360        1-Apr-29          $350,669.35     80.00                                0.250
4974930        360        1-Apr-29          $351,566.10     80.00                                0.250
4974949        360        1-Apr-29          $307,215.19     80.00                                0.250
4975100        360        1-May-29          $380,000.00     69.53                                0.250
4975251        360        1-Apr-29          $874,208.98     59.32                                0.250
4975626        360        1-Apr-29          $349,691.20     72.16                                0.250
4975713        360        1-May-29          $300,000.00     77.12                                0.250
4976281        360        1-Apr-29          $248,651.00     90.00                                0.250
4976512        360        1-Apr-29          $319,196.84     90.00                    11          0.250
4976600        360        1-Apr-29          $373,170.46     90.00                    11          0.250
4976695        360        1-May-29          $261,000.00     89.99                                0.250
4976719        360        1-May-29          $319,000.00     89.17                                0.250
4976796        360        1-Apr-29          $476,389.48     79.99                                0.250
4976919        360        1-May-29          $318,000.00     88.83                    11          0.250
4977224        360        1-May-29          $450,000.00     50.62                                0.250
4977231        360        1-May-29          $322,000.00     88.22                    11          0.250
4977312        360        1-Apr-29          $349,698.65     54.69                                0.250
4977358        360        1-Apr-29          $367,698.35     80.00                                0.250
4977683        360        1-Apr-29          $495,517.92     80.00                                0.250
4977774        360        1-May-29          $300,000.00     41.07                                0.250
4977890        360        1-May-29          $296,000.00     80.00                                0.250
4977926        360        1-May-29          $251,000.00     79.99                                0.250
4978024        360        1-Apr-29        $1,049,095.96     75.00                                0.250
4978034        360        1-May-29          $389,950.00     75.72                                0.250
4978062        360        1-May-29          $324,000.00     90.00     GD 5YR                     0.250
4978131        360        1-Apr-29          $398,730.88     79.97                                0.250
4978200        360        1-May-29          $427,000.00     70.00                                0.250
4978220        360        1-May-29          $315,200.00     80.00                                0.250
4978227        360        1-May-29          $339,200.00     80.00                                0.250
4978361        360        1-Apr-29          $436,614.44     80.00                                0.250
4978420        360        1-May-29          $256,000.00     80.00                                0.250
4978602        360        1-May-29          $315,000.00     90.00                                0.250
4978629        360        1-Apr-29          $363,586.69     62.85                                0.250
4978669        360        1-May-29          $317,100.00     79.99                                0.250
4978704        360        1-Apr-29          $398,161.25     79.96                                0.250
4978753        360        1-Apr-29          $603,492.56     80.00                                0.250
4978842        360        1-May-29          $250,650.00     90.00                                0.250
4978866        360        1-Apr-29          $315,734.52     80.00                                0.250
4979175        360        1-May-29          $248,000.00     80.00                                0.250
4979184        360        1-May-29          $300,000.00     54.55                                0.250
4979278        360        1-May-29          $285,200.00     90.00                                0.250
4979294        360        1-May-29          $323,100.00     90.00                                0.250
4979348        360        1-May-29          $292,500.00     90.00                                0.250
4979490        360        1-May-29          $750,000.00     63.97                                0.250
4979557        360        1-May-29          $350,000.00     80.00                                0.250
4979880        360        1-Apr-29          $518,542.09     75.00                                0.250
4979957        360        1-May-29          $356,000.00     80.00                                0.250
4980096        360        1-Apr-29          $434,107.20     78.36                                0.250
4980168        360        1-Apr-29          $279,740.66     80.00                                0.250
4980477        360        1-Apr-29          $269,784.08     72.97     GD 3YR                     0.250
4980675        360        1-May-29          $650,000.00     39.63                                0.250
4980800        360        1-Apr-29          $359,148.01     70.00                                0.250
4980821        360        1-Apr-29          $252,692.69     94.92                                0.250
4980863        360        1-Apr-29          $399,647.08     42.33                                0.250
4980871        360        1-May-29          $288,000.00     90.00                    11          0.250
4981045        360        1-May-29          $371,000.00     78.77                                0.250
4981574        360        1-May-29          $348,000.00     80.00                                0.250
4981641        360        1-May-29          $352,000.00     80.00                                0.250
4981743        360        1-Apr-29          $167,048.85     80.00                                0.250
4981850        360        1-Apr-29          $295,145.67     79.99                                0.250
4981893        360        1-May-29          $380,000.00     75.64                                0.250
4981938        360        1-Apr-29          $359,682.38     80.00                                0.250
4982138        360        1-Apr-29          $499,558.86     56.21                                0.250
4982736        360        1-May-29          $416,000.00     79.24                                0.250
4982810        360        1-May-29          $400,000.00     67.57     GD 2YR                     0.250
4982846        360        1-Apr-29          $301,327.35     80.00                                0.250
4982857        360        1-Apr-29          $577,526.22     80.00                                0.250
4983240        360        1-May-29          $750,000.00     63.16                                0.250
4983414        360        1-May-29          $650,000.00     40.91                                0.250
4983430        360        1-Apr-29          $449,621.95     73.77                                0.250
4983472        360        1-May-29        $1,000,000.00     49.75                                0.250
4983487        360        1-Apr-29          $254,769.47     78.11                                0.250
4983526        360        1-May-29          $265,000.00     64.48                                0.250
4983709        360        1-Apr-29          $257,772.36     66.49                                0.250
4983782        360        1-May-29          $250,000.00     88.03                    06          0.250
4983798        360        1-Apr-29          $269,761.78     69.41                                0.250
4983842        360        1-May-29          $264,000.00     80.00                                0.250
4984035        360        1-Apr-29          $339,741.28     89.31                                0.250
4984200        360        1-Apr-29          $342,504.85     80.00                                0.250
4984284        360        1-Apr-29          $283,743.25     80.00                                0.250
4984285        360        1-May-29          $270,350.00     79.99                                0.250
4984318        360        1-Apr-29          $266,764.42     60.68     GD 4YR                     0.250
4984323        360        1-May-29          $880,000.00     80.00                                0.250
4984718        360        1-Apr-29          $334,697.15     70.53                                0.250
4984721        360        1-Apr-29          $564,489.23     41.77                                0.250
4984736        360        1-May-29          $314,000.00     80.00                                0.250
4984795        360        1-Apr-29          $399,247.43     90.00                                0.250
4984896        360        1-Apr-29          $399,620.46     66.67                                0.250
4985057        360        1-Apr-29          $259,175.98     95.00                                0.250
4985080        360        1-May-29          $650,000.00     78.79                                0.250
4985253        360        1-Apr-29          $327,737.70     80.00                                0.250
4985269        360        1-May-29          $325,000.00     54.62                                0.250
4985386        360        1-May-29          $250,200.00     90.00                                0.250
4985623        360        1-Apr-29          $399,655.60     73.43                                0.250
4985681        360        1-Apr-29          $331,721.07     89.97                                0.250
4986163        360        1-May-29          $427,500.00     68.13                                0.250
4986199        360        1-May-29          $278,050.00     89.99                    17          0.250
4986279        360        1-May-29          $247,200.00     79.74                                0.250
4986395        360        1-May-29          $536,000.00     79.87     GD 3YR                     0.250
4986560        360        1-Apr-29          $159,862.24     80.00                                0.250
4986707        360        1-Apr-29          $358,083.79     80.00                                0.250
4986752        360        1-May-29          $268,000.00     80.00                                0.250
4986800        360        1-Apr-29          $299,760.09     79.37                                0.250
4986833        360        1-Apr-29          $404,951.04     70.00     GD 4YR                     0.250
4987134        360        1-May-29          $257,300.00     90.00                    17          0.250
4987452        360        1-May-29          $308,000.00     80.00                                0.250
4987485        360        1-May-29          $244,000.00     80.00                                0.250
4987509        360        1-Apr-29          $320,523.79     80.00                                0.250
4987520        360        1-Apr-29          $257,383.58     80.00                                0.250
4987672        360        1-Apr-29          $349,651.57     61.40                                0.250
4987704        360        1-May-29          $550,000.00     80.00                                0.250
4987861        360        1-Apr-29          $271,371.82     80.00                                0.250
4987911        360        1-May-29          $265,200.00     80.00     GD 1YR                     0.250
4987949        360        1-Apr-29          $261,430.18     80.00                                0.250
4988059        360        1-May-29          $455,000.00     75.21                                0.250
4988202        360        1-Apr-29          $403,625.81     80.00                                0.250
4988449        360        1-May-29          $272,000.00     80.00                                0.250
4988519        360        1-May-29          $335,000.00     69.07                                0.250
4988617        360        1-May-29          $428,000.00     80.00                                0.250
4988629        360        1-May-29          $275,000.00     88.71                                0.250
4988733        360        1-Apr-29          $399,629.52     72.09                                0.250
4988787        360        1-May-29          $278,100.00     90.00                                0.250
4989090        360        1-May-29          $441,600.00     80.00                                0.250
4989493        360        1-Apr-29          $354,922.90     80.00     GD 3YR                     0.250
4989606        360        1-May-29          $288,000.00     90.00     GD 3YR                     0.250
4989686        360        1-May-29          $270,900.00     90.00                                0.250
4990077        360        1-May-29          $289,750.00     95.00     GD 5YR                     0.250
4990423        360        1-May-29          $324,000.00     80.00                                0.250
4990440        360        1-May-29          $256,000.00     80.00     GD10YR                     0.250
4990456        360        1-May-29          $340,000.00     79.76                                0.250
4990658        360        1-May-29          $364,000.00     80.00                                0.250
4990680        360        1-May-29          $640,000.00     74.99                                0.250
4990769        360        1-May-29          $391,500.00     90.00     GD 3YR                     0.250
4991358        360        1-May-29          $248,000.00     80.00                                0.250
4991555        360        1-May-29          $594,000.00     79.84                                0.250
4991624        360        1-May-29          $298,000.00     60.20                                0.250
4991782        360        1-Apr-29          $399,672.12     68.26     GD 5YR                     0.250
4991844        360        1-Apr-29          $319,724.48     47.76                                0.250
4991909        360        1-May-29          $265,200.00     80.00                                0.250
4992163        360        1-Apr-29          $244,773.07     66.23                                0.250
4992183        360        1-May-29          $410,000.00     59.42                                0.250
4992291        360        1-May-29          $262,000.00     79.64                                0.250
4992585        360        1-May-29          $300,000.00     73.17                                0.250
4992771        360        1-May-29          $260,000.00     74.29                                0.250
4992835        360        1-Apr-29          $379,695.83     80.00                                0.250
4993129        360        1-May-29          $330,000.00     68.75                                0.250
4993326        360        1-May-29          $442,500.00     79.99                                0.250
4993365        360        1-Apr-29          $275,768.12     80.00                                0.250
4993408        360        1-May-29          $283,100.00     95.00                                0.250
4993454        360        1-May-29          $254,400.00     80.00                                0.250
4993460        360        1-Apr-29          $258,512.75     94.99                    13          0.250
4993733        360        1-May-29          $181,500.00     73.63                                0.250
4993906        360        1-May-29          $291,200.00     80.00                                0.250
4994012        360        1-May-29          $406,000.00     64.86                                0.250
4994167        360        1-May-29          $395,250.00     79.99                                0.250
4994189        360        1-May-29          $250,000.00     72.20                                0.250
4994215        360        1-May-29          $355,500.00     90.00                                0.250
4994570        360        1-May-29          $260,000.00     80.00                                0.250
4994628        360        1-Apr-29          $324,726.96     50.73                                0.250
4994641        360        1-Apr-29          $304,737.40     53.65                                0.250
4994739        360        1-May-29        $1,000,000.00     57.64                                0.250
4994897        360        1-May-29          $400,000.00     80.00                                0.250
4995097        360        1-May-29          $350,000.00     63.99                                0.250
4995348        360        1-May-29          $554,000.00     80.00                                0.250
4995620        360        1-Apr-29          $336,467.09     79.99                                0.250
4995891        360        1-May-29          $335,000.00     88.16                                0.250
4995970        360        1-May-29          $264,800.00     80.00                                0.250
4996163        360        1-May-29          $380,000.00     80.00                                0.250
4996263        360        1-Jan-29          $287,070.52     80.00                                0.250
4996325        360        1-Apr-29          $329,729.50     62.26                                0.250
4996405        360        1-May-29          $270,000.00     49.09                                0.250
4996419        360        1-May-29          $300,000.00     75.47                                0.250
4996561        360        1-Apr-29          $262,179.54     80.00                                0.250
4997167        360        1-Apr-29          $339,707.26     80.00                                0.250
4997199        360        1-May-29          $269,900.00     90.00                                0.250
4997202        360        1-May-29          $260,000.00     78.80                                0.250
4997621        360        1-May-29          $383,120.00     80.00                                0.250
4997762        360        1-Apr-29          $265,781.96     95.00                                0.250
4997810        360        1-Apr-29          $271,771.49     80.00                                0.250
4998049        360        1-May-29          $340,000.00     80.00                                0.250
4998087        360        1-May-29          $285,350.00     92.83                                0.250
4998254        360        1-May-29          $380,000.00     79.17                                0.250
4998477        360        1-May-29          $365,000.00     79.87                                0.250
4998564        360        1-Apr-29          $284,754.62     77.03                                0.250
4998865        360        1-May-29          $267,000.00     86.97                    17          0.250
4998949        360        1-May-29          $282,150.00     95.00                                0.250
4999225        360        1-May-29          $360,000.00     63.16                                0.250
4999295        360        1-Apr-29          $319,744.10     80.00                                0.250
4999361        360        1-Apr-29          $484,082.85     85.00                    11          0.250
4999562        360        1-Apr-29          $323,740.90     90.00                                0.250
4999639        360        1-Apr-29          $469,575.11     62.25                                0.250
4999833        360        1-May-29          $270,000.00     93.10                                0.250
5000012        360        1-May-29          $468,000.00     80.00                                0.250
5000465        360        1-May-29          $271,200.00     80.00                                0.250
5000475        360        1-Apr-29          $295,763.29     80.00                                0.250
5000511        360        1-Apr-29          $523,076.70     79.99                                0.250
5000707        360        1-Apr-29          $299,728.79     77.53                                0.250
5000907        360        1-May-29          $300,000.00     80.00                                0.250
5001014        360        1-Apr-29          $339,685.09     73.28                                0.250
5001026        360        1-May-29          $500,000.00     52.69                                0.250
5001446        360        1-May-29          $295,000.00     74.68                                0.250
5001558        360        1-May-29          $292,500.00     90.00     GD 2YR         33          0.250
5001989        360        1-May-29          $311,200.00     80.00     GD 6YR                     0.250
5002444        360        1-May-29          $328,000.00     80.00                                0.250
5002462        360        1-May-29          $344,000.00     80.00                                0.250
5002690        360        1-May-29          $544,000.00     80.00     GD 3YR                     0.250
5002916        360        1-May-29          $359,200.00     80.00                                0.250
5002997        360        1-May-29          $332,890.00     80.00                                0.250
5003279        360        1-May-29          $461,200.00     80.00                                0.250
5003404        360        1-Apr-29          $259,770.61     77.61                                0.250
5003617        360        1-Apr-29          $339,714.36     79.91                                0.250
5004275        360        1-May-29          $425,000.00     76.30                                0.250
5004334        360        1-May-29          $383,920.00     80.00                                0.250
5004804        360        1-May-29          $360,000.00     63.16                                0.250
5004869        360        1-May-29          $257,600.00     80.00                                0.250
5004930        360        1-May-29          $316,800.00     80.00                                0.250
5005468        360        1-May-29          $256,000.00     80.00                                0.250
5005494        360        1-May-29          $266,000.00     80.00                                0.250
5006134        360        1-Apr-29          $299,747.96     57.14                                0.250
5006389        360        1-May-29          $343,200.00     80.00                                0.250
5006420        360        1-May-29          $300,350.00     89.99                                0.250
5006790        360        1-May-29          $256,000.00     80.00                                0.250
5007039        360        1-May-29          $450,000.00     40.91                                0.250
5007247        360        1-May-29          $271,600.00     70.00                                0.250
5007833        360        1-May-29          $275,300.00     80.00                                0.250
5008056        360        1-May-29          $384,000.00     80.00                                0.250
5008399        360        1-May-29          $252,000.00     80.00                                0.250
5008542        360        1-May-29          $274,000.00     80.00                                0.250
5008606        360        1-May-29          $284,000.00     80.00                                0.250
5008813        360        1-May-29          $382,500.00     90.00                                0.250
5009133        360        1-May-29          $262,400.00     80.00                                0.250
5009881        360        1-May-29          $372,000.00     80.00                                0.250
5012676        360        1-May-29          $295,200.00     80.00                                0.250
5013503        360        1-May-29          $285,000.00     95.00                                0.250
5013655        360        1-May-29          $267,000.00     78.76                                0.250
5014013        360        1-May-29          $276,000.00     80.00                                0.250
5014548        360        1-May-29          $430,000.00     63.24                                0.250
5015635        360        1-May-29          $567,550.00     80.00                                0.250
5017403        360        1-May-29          $450,000.00     80.00                                0.250
5018674        360        1-May-29          $309,600.00     80.00                                0.250
5019242        360        1-May-29          $317,650.00     79.99                                0.250
6938244        360        1-Mar-29          $383,924.54     54.43                                0.250
7540463        360        1-Feb-29          $281,635.34     80.00                                0.250
7594032        360        1-Mar-29          $407,345.52     71.08                                0.250
7626167        360        1-Apr-29          $266,104.25     80.00                                0.250
7641976        360        1-Apr-29          $378,698.33     90.00                    17          0.250
7706721        360        1-May-29          $300,000.00     80.00                                0.250
                                        ---------------
                                        $155,252,184.38

<PAGE>

NASCOR
NMI/1999-17 Exhibit F-1
30 YEAR FIXED RATE RELOCATION LOANS
(continued)

<CAPTION>
  (i)         (xiv)        (xv)        (xvi)
- --------     --------     -------     --------
MORTGAGE      T.O.P.      MASTER       FIXED
  LOAN       MORTGAGE     SERVICE     RETAINED
 NUMBER        LOAN         FEE        YIELD
- --------     --------     -------     --------
<S>          <C>          <C>         <C>
4747909                    0.017       0.000
4758224                    0.017       0.233
4772634                    0.017       0.733
4783380                    0.017       0.358
4791274                    0.017       0.858
4791692                    0.017       0.108
4791701                    0.017       0.000
4795867                    0.017       0.608
4815683                    0.017       0.358
4824438                    0.017       0.483
4825321                    0.017       0.233
4826430                    0.017       0.858
4846719                    0.017       0.733
4850631                    0.017       0.608
4852706                    0.017       0.858
4853493                    0.017       0.733
4870407                    0.017       0.233
4876185                    0.017       0.108
4876307                    0.017       0.608
4877381                    0.017       0.483
4880560                    0.017       0.483
4884845                    0.017       0.483
4886566                    0.017       0.108
4890250                    0.017       0.233
4891731                    0.017       0.483
4893054                    0.017       0.000
4896251                    0.017       0.000
4901968                    0.017       0.000
4908408                    0.017       0.108
4913529                    0.017       0.000
4915513                    0.017       0.608
4918524                    0.017       0.000
4920168                    0.017       0.858
4920269                    0.017       0.108
4921003                    0.017       0.608
4923555                    0.017       0.733
4924485                    0.017       0.000
4924623                    0.017       0.000
4926256                    0.017       0.000
4926412                    0.017       0.000
4928759                    0.017       0.358
4929019                    0.017       0.000
4930067                    0.017       0.108
4931066                    0.017       0.108
4931238                    0.017       0.000
4931559                    0.017       0.233
4931726                    0.017       0.108
4931761                    0.017       0.108
4932350                    0.017       0.000
4933344                    0.017       0.358
4933807                    0.017       0.233
4934587                    0.017       0.000
4936384                    0.017       0.233
4937151                    0.017       0.000
4937654                    0.017       0.358
4937658                    0.017       0.483
4938350                    0.017       0.108
4938669                    0.017       0.233
4939349                    0.017       0.108
4939611                    0.017       0.000
4940422                    0.017       0.000
4940592                    0.017       0.000
4941349                    0.017       0.983
4942205                    0.017       0.000
4943119                    0.017       0.608
4948236                    0.017       0.000
4949023                    0.017       0.358
4949525                    0.017       0.000
4949547                    0.017       0.233
4949582                    0.017       0.483
4949583                    0.017       0.000
4949871                    0.017       0.000
4950097                    0.017       0.000
4951394                    0.017       0.483
4952006                    0.017       0.000
4952334                    0.017       0.000
4952835                    0.017       0.233
4952944                    0.017       0.000
4953194                    0.017       0.983
4953243                    0.017       0.858
4953401                    0.017       0.358
4953451                    0.017       0.483
4953721                    0.017       0.483
4954074                    0.017       0.000
4954520                    0.017       0.358
4954767                    0.017       0.358
4955106                    0.017       0.108
4955141                    0.017       0.233
4955509                    0.017       0.000
4955914                    0.017       0.358
4956422                    0.017       0.483
4956434                    0.017       0.733
4956491                    0.017       0.108
4956690                    0.017       0.233
4956937                    0.017       0.000
4957144                    0.017       0.233
4957788                    0.017       0.233
4959174                    0.017       0.358
4959194                    0.017       0.233
4959339                    0.017       0.000
4959371                    0.017       0.000
4960271                    0.017       0.733
4960995                    0.017       0.000
4961223                    0.017       0.358
4961673                    0.017       0.233
4961714                    0.017       0.000
4961733                    0.017       0.733
4962028                    0.017       0.358
4962235                    0.017       0.733
4962329                    0.017       0.608
4962334                    0.017       0.358
4962813                    0.017       0.000
4963311                    0.017       0.608
4963925                    0.017       0.233
4964356                    0.017       0.608
4964381                    0.017       0.233
4964442                    0.017       0.358
4964470                    0.017       0.483
4965054                    0.017       0.983
4965232                    0.017       0.000
4965438                    0.017       0.000
4965960                    0.017       0.000
4966197                    0.017       0.233
4966349                    0.017       0.358
4966553                    0.017       0.000
4966597                    0.017       0.233
4966632                    0.017       0.000
4966851                    0.017       0.358
4966940                    0.017       1.358
4967137                    0.017       0.358
4967215                    0.017       0.108
4967499                    0.017       0.000
4967718                    0.017       0.000
4968011                    0.017       0.358
4968019                    0.017       0.608
4968036                    0.017       0.108
4968229                    0.017       0.608
4968529                    0.017       0.358
4968982                    0.017       0.233
4969080                    0.017       0.000
4969129                    0.017       0.358
4969274                    0.017       0.358
4969290                    0.017       0.000
4969298                    0.017       0.608
4969329                    0.017       0.000
4969595                    0.017       0.483
4970439                    0.017       0.000
4970554                    0.017       0.000
4970842                    0.017       0.000
4971039                    0.017       0.108
4971322                    0.017       0.233
4971398                    0.017       0.233
4971920                    0.017       0.000
4972032                    0.017       0.000
4972131                    0.017       0.000
4972169                    0.017       0.108
4972293                    0.017       0.108
4972418                    0.017       0.108
4972438                    0.017       0.233
4972649                    0.017       0.108
4972798                    0.017       0.733
4973385                    0.017       0.000
4973573                    0.017       0.358
4973588                    0.017       0.000
4973684                    0.017       0.000
4973690                    0.017       0.000
4973697                    0.017       0.858
4973708                    0.017       0.733
4973740                    0.017       0.000
4973783                    0.017       0.000
4973803                    0.017       0.108
4973852                    0.017       0.233
4973881                    0.017       0.108
4974153                    0.017       0.358
4974154                    0.017       0.233
4974296                    0.017       0.000
4974516                    0.017       0.000
4974627                    0.017       0.358
4974660                    0.017       0.233
4974668                    0.017       0.108
4974715                    0.017       0.000
4974743                    0.017       0.483
4974840                    0.017       0.358
4974866                    0.017       0.608
4974930                    0.017       0.000
4974949                    0.017       0.000
4975100                    0.017       0.000
4975251                    0.017       0.000
4975626                    0.017       0.108
4975713                    0.017       0.000
4976281                    0.017       0.608
4976512                    0.017       0.000
4976600                    0.017       0.108
4976695                    0.017       0.233
4976719                    0.017       0.358
4976796                    0.017       0.233
4976919                    0.017       0.233
4977224                    0.017       0.608
4977231                    0.017       0.483
4977312                    0.017       0.233
4977358                    0.017       0.483
4977683                    0.017       0.000
4977774                    0.017       0.233
4977890                    0.017       0.233
4977926                    0.017       0.608
4978024                    0.017       0.233
4978034                    0.017       0.000
4978062                    0.017       0.358
4978131                    0.017       0.608
4978200                    0.017       0.000
4978220                    0.017       0.000
4978227                    0.017       0.483
4978361                    0.017       0.108
4978420                    0.017       0.000
4978602                    0.017       0.608
4978629                    0.017       0.233
4978669                    0.017       0.000
4978704                    0.017       0.000
4978753                    0.017       0.358
4978842                    0.017       0.108
4978866                    0.017       0.358
4979175                    0.017       0.608
4979184                    0.017       0.483
4979278                    0.017       0.358
4979294                    0.017       0.000
4979348                    0.017       0.358
4979490                    0.017       0.000
4979557                    0.017       0.000
4979880                    0.017       0.108
4979957                    0.017       0.233
4980096                    0.017       0.000
4980168                    0.017       0.000
4980477                    0.017       0.608
4980675                    0.017       0.358
4980800                    0.017       0.358
4980821                    0.017       0.483
4980863                    0.017       0.108
4980871                    0.017       0.483
4981045                    0.017       0.608
4981574                    0.017       0.000
4981641                    0.017       0.358
4981743                    0.017       0.000
4981850                    0.017       0.233
4981893                    0.017       0.358
4981938                    0.017       0.108
4982138                    0.017       0.108
4982736                    0.017       0.108
4982810                    0.017       0.358
4982846                    0.017       0.000
4982857                    0.017       0.483
4983240                    0.017       0.608
4983414                    0.017       0.358
4983430                    0.017       0.358
4983472                    0.017       0.000
4983487                    0.017       0.000
4983526                    0.017       0.000
4983709                    0.017       0.108
4983782                    0.017       0.233
4983798                    0.017       0.108
4983842                    0.017       0.000
4984035                    0.017       0.858
4984200                    0.017       0.233
4984284                    0.017       0.000
4984285                    0.017       0.108
4984318                    0.017       0.108
4984323                    0.017       0.000
4984718                    0.017       0.000
4984721                    0.017       0.000
4984736                    0.017       0.358
4984795                    0.017       0.108
4984896                    0.017       0.000
4985057                    0.017       1.483
4985080                    0.017       0.108
4985253                    0.017       0.608
4985269                    0.017       0.108
4985386                    0.017       0.358
4985623                    0.017       0.233
4985681                    0.017       0.358
4986163                    0.017       0.000
4986199                    0.017       0.608
4986279                    0.017       0.358
4986395                    0.017       0.000
4986560                    0.017       0.233
4986707                    0.017       0.108
4986752                    0.017       0.000
4986800                    0.017       0.608
4986833                    0.017       0.233
4987134                    0.017       0.108
4987452                    0.017       0.233
4987485                    0.017       0.233
4987509                    0.017       0.233
4987520                    0.017       0.358
4987672                    0.017       0.000
4987704                    0.017       0.233
4987861                    0.017       0.358
4987911                    0.017       0.358
4987949                    0.017       0.358
4988059                    0.017       0.000
4988202                    0.017       0.000
4988449                    0.017       0.000
4988519                    0.017       0.000
4988617                    0.017       0.483
4988629                    0.017       0.858
4988733                    0.017       0.000
4988787                    0.017       0.233
4989090                    0.017       0.483
4989493                    0.017       0.733
4989606                    0.017       0.983
4989686                    0.017       0.108
4990077                    0.017       0.858
4990423                    0.017       0.358
4990440                    0.017       0.608
4990456                    0.017       0.358
4990658                    0.017       0.108
4990680                    0.017       0.233
4990769                    0.017       0.608
4991358                    0.017       0.358
4991555                    0.017       0.000
4991624                    0.017       0.608
4991782                    0.017       0.483
4991844                    0.017       0.233
4991909                    0.017       0.483
4992163                    0.017       0.000
4992183                    0.017       0.000
4992291                    0.017       0.000
4992585                    0.017       0.233
4992771                    0.017       0.233
4992835                    0.017       0.733
4993129                    0.017       0.000
4993326                    0.017       0.608
4993365                    0.017       0.358
4993408                    0.017       0.733
4993454                    0.017       0.483
4993460                    0.017       1.108
4993733                    0.017       0.358
4993906                    0.017       0.233
4994012                    0.017       0.233
4994167                    0.017       0.608
4994189                    0.017       0.108
4994215                    0.017       0.233
4994570                    0.017       0.483
4994628                    0.017       0.358
4994641                    0.017       0.233
4994739                    0.017       0.108
4994897                    0.017       0.733
4995097                    0.017       0.233
4995348                    0.017       0.358
4995620                    0.017       0.358
4995891                    0.017       0.483
4995970                    0.017       0.000
4996163                    0.017       0.483
4996263                    0.017       0.608
4996325                    0.017       0.483
4996405                    0.017       0.000
4996419                    0.017       0.483
4996561                    0.017       0.358
4997167                    0.017       0.233
4997199                    0.017       0.858
4997202                    0.017       0.108
4997621                    0.017       0.108
4997762                    0.017       0.483
4997810                    0.017       0.358
4998049                    0.017       0.358
4998087                    0.017       0.858
4998254                    0.017       0.233
4998477                    0.017       0.608
4998564                    0.017       0.233
4998865                    0.017       0.608
4998949                    0.017       1.233
4999225                    0.017       0.233
4999295                    0.017       0.608
4999361                    0.017       0.233
4999562                    0.017       0.608
4999639                    0.017       0.000
4999833                    0.017       0.983
5000012                    0.017       0.358
5000465                    0.017       0.000
5000475                    0.017       0.608
5000511                    0.017       0.000
5000707                    0.017       0.000
5000907                    0.017       0.000
5001014                    0.017       0.000
5001026                    0.017       0.000
5001446                    0.017       0.108
5001558                    0.017       0.483
5001989                    0.017       0.483
5002444                    0.017       0.358
5002462                    0.017       0.233
5002690                    0.017       0.108
5002916                    0.017       0.000
5002997                    0.017       0.358
5003279                    0.017       0.108
5003404                    0.017       0.108
5003617                    0.017       0.358
5004275                    0.017       0.108
5004334                    0.017       0.108
5004804                    0.017       0.233
5004869                    0.017       0.733
5004930                    0.017       0.000
5005468                    0.017       0.233
5005494                    0.017       0.358
5006134                    0.017       0.358
5006389                    0.017       0.358
5006420                    0.017       0.000
5006790                    0.017       0.733
5007039                    0.017       0.000
5007247                    0.017       0.483
5007833                    0.017       0.000
5008056                    0.017       0.233
5008399                    0.017       0.233
5008542                    0.017       0.000
5008606                    0.017       0.483
5008813                    0.017       0.608
5009133                    0.017       0.108
5009881                    0.017       0.000
5012676                    0.017       0.233
5013503                    0.017       0.608
5013655                    0.017       0.358
5014013                    0.017       0.000
5014548                    0.017       0.483
5015635                    0.017       0.483
5017403                    0.017       0.483
5018674                    0.017       0.483
5019242                    0.017       0.233
6938244                    0.017       0.000
7540463                    0.017       0.733
7594032                    0.017       0.608
7626167                    0.017       0.733
7641976                    0.017       0.483
7706721                    0.017       0.000


COUNT:                  430
WAC:            6.729091922
WAM:            359.4065854
WALTV:          76.67508114
</TABLE>


<PAGE>

                                   EXHIBIT F-2

            [Schedule of Mortgage Loans Serviced by Other Servicers]



<TABLE>
NASCOR
NMI/1999-17 Exhibit F-2 (Part A)
30 YEAR FIXED RATE RELOCATION LOANS

<CAPTION>
  (i)                          (ii)                         (iii)         (iv)
- --------     -----------------------------------------     --------     --------
MORTGAGE                                                                MORTGAGE
  LOAN                                            ZIP      PROPERTY     INTEREST
 NUMBER              CITY              STATE     CODE        TYPE         RATE
- --------     ---------------------     -----     -----     --------     --------
<S>          <C>                       <C>       <C>       <C>          <C>
4934533      COPPEL                     TX       75019       SFD         6.625
4948832      RALEIGH                    NC       27615       SFD         6.375
4956534      LA JOLLA                   CA       92037       SFD         6.500
4964742      WEST HARTFORD              CT       06117       SFD         6.750
4995902      ARCADIA                    CA       91006       SFD         7.125
4995917      NORTH STONINGTON           CT       06359       SFD         6.625
4995923      IRVINE                     CA       92620       SFD         6.750
4995936      MARIETTA                   GA       30067       SFD         6.250
4996025      AIKEN                      SC       29803       SFD         6.875
4997118      CORAL SPRINGS              FL       33071       SFD         6.875
4998954      GLEN MILLS                 PA       19342       SFD         7.125
4998965      CHARLOTTE                  NC       28216       SFD         6.750
4998969      WINDERMERE                 FL       34786       SFD         6.750
4998981      HOPEWELL TOWNSHIP          NJ       08534       SFD         6.375
4998996      MAPLE GROVE                MN       55311       SFD         7.000
4999000      NEWTON                     CT       06470       SFD         6.875
4999006      MATTHEWS                   NC       28105       SFD         6.250
4999033      ROANOKE                    VA       24018       SFD         6.500
4999081      CORNELIUS                  NC       28031       SFD         6.750
4999125      CLERMONT                   FL       34711       SFD         7.000
4999150      WARRENTON                  VA       20187       SFD         7.000
4999151      TOWN OF WESTFIELD          NJ       07090       SFD         6.625
4999195      FLORENCE                   SC       29501       SFD         7.000
4999324      ORINDA                     CA       94563       SFD         6.875
4999339      CLINTON                    TN       37716       SFD         6.625
4999353      SPRING                     TX       77379       SFD         7.000
4999360      ISSAQUAH                   WA       98029       SFD         6.250
4999373      MARIETTA                   GA       30066       SFD         6.750
4999374      MARLBOROUGH                MA       01752       SFD         6.750
4999484      CHARLOTTE                  NC       28216       SFD         7.125
4999550      MOUNT OLIVE                NJ       07828       SFD         6.625
4999644      RICHMOND                   VA       23226       SFD         6.500
4999658      BERKELEY                   CA       94710       SFD         7.000
4999670      CHARLOTTE                  NC       28216       SFD         7.000
4999888      HOUSTON                    TX       77041       SFD         6.500
5011782      WEST NEWBURY               MA       01985       SFD         6.875
5011835      STAMFORD                   CT       06902       SFD         6.500
5011843      HOPKINGTON                 MA       01748       SFD         7.000
5011848      INDIANAPOLIS               IN       46236       SFD         6.875
5011861      SPARTA                     NJ       07871       SFD         6.500
5011883      WESTON                     FL       33327       SFD         6.625
5011907      OVERLAND PARK              KS       66213       SFD         7.000
5011908      KANSAS CITY                MO       64157       SFD         6.750
5011959      HENDEROSN                  NV       89014       SFD         7.250
5011966      NAPERVILLE                 IL       60565       SFD         7.000
5011978      PINCKNEY                   MI       48169       SFD         6.875
5011984      FRISCO                     TX       75034       SFD         6.875
5012015      OLD TAPPAN                 NJ       07675       SFD         6.500
5012024      WINCHESTER                 MA       01890       SFD         6.375
5012029      BELLEMEAD                  NJ       08502       SFD         6.250
5012030      WESTPORT                   CT       06880       SFD         6.750
5012038      SCOTCH PLAINS              NJ       07076       SFD         7.125
5012043      MARIETTA                   GA       30062       SFD         6.250
5012045      SAN RAMON                  CA       94583       SFD         6.500
5012051      PARKVILLE                  MO       64152       SFD         6.750
5012053      STAMFORD                   CT       06903       SFD         7.250
5012058      SEATTLE                    WA       98116       SFD         7.500
5012062      BOCA RATON                 FL       33498       SFD         6.625
5012070      ST SIMONS ISLAND           GA       31522       SFD         6.750
5012092      EDISON                     NJ       08820       SFD         6.500
5012106      INDEPENDENCE               MI       48348       SFD         6.875
5012113      RANCHO SANTA MARGARIT      CA       92688       SFD         6.750
5012116      HINSDALE                   IL       60521       SFD         6.250
5012118      VANCOUVER                  WA       98665       SFD         6.375
5012121      HIGHLAND PARK              NJ       08904       SFD         7.250
5012135      CAMPBELL                   CA       95008       SFD         6.625
5012138      HOUSTON                    TX       77006       SFD         6.750
5012145      ALPHARETTA                 GA       30022       SFD         6.375
5012157      RANDOLPH                   NJ       07869       SFD         6.750
5012162      TAMPA                      FL       33629       SFD         6.250
5012177      PLEASANTON                 CA       94588       SFD         6.750
5012196      BLACKSBURG                 VA       24060       SFD         6.750
5012202      ALPHARETTA                 GA       30022       SFD         7.000
5012268      ATLANTA                    GA       30350       SFD         6.875
5012274      KENNETT SQUARE             PA       19348       SFD         6.500
5012276      GOLDEN                     CO       80401       SFD         6.875
5012277      ARNOLD                     MD       21012       SFD         6.875
5012288      WOODBURY                   CT       06798       SFD         6.625
5012291      PONTE VEDRA BEACH          FL       32082       SFD         6.500
5012304      WARREN                     NJ       07059       SFD         6.875
5012306      ANAHEIM                    CA       92808       SFD         7.125
5012313      MILFORD                    CT       06460       SFD         6.625
5012314      THOUSAND OAKS              CA       91320       SFD         6.875
5012356      OAKLAND                    CA       94618       SFD         6.750
5012357      NOBLESVILLE                IN       46060       SFD         6.125
5012359      CARMEL                     IN       46032       SFD         6.375
5012377      LITTLETON                  CO       80127       SFD         6.625
5012383      VERNON HILLS               IL       60061       SFD         7.000
5012394      HOUSTON                    TX       77401       SFD         6.625
5012399      HOUSTON                    TX       77056       PUD         6.625
5012402      LIBERTYVILLE               IL       60048       SFD         6.750
5012405      ARCADIA                    CA       91007       SFD         6.500
5012407      WESTMINSTER                CO       80030       SFD         6.500
5012415      POMONA                     NY       10970       SFD         6.625
5012419      CHESTER                    NJ       07931       SFD         6.875
5012455      TEWKSBURY                  NJ       07830       SFD         6.625
5012493      DOYLESTOWN                 PA       18901       SFD         6.500
5012543      NEWHALL                    CA       91321       SFD         6.625
5012589      GLEN ROCK                  NJ       07452       SFD         6.750
5012599      DES MOINES                 WA       98198       SFD         6.625
5012680      LAGRANGEVILLE              NY       12540       SFD         7.000
5012685      SCOTTSDALE                 AZ       85260       SFD         6.500
5012702      MORGAN HILL                CA       95037       SFD         6.250
5012710      UPPER SADDLE RIVER         NJ       07458       SFD         6.625
5012721      SCOTTSDALE                 AZ       85259       SFD         6.875
5012727      CHANTILLY                  VA       20151       SFD         6.500
5012748      AURORA                     IL       60504       SFD         6.375
5012752      PARK CITY                  UT       84098       SFD         6.875
5012757      GURNEE                     IL       60031       SFD         6.750
5012764      EUGENE                     OR       97401       SFD         6.375
5012780      RICHMOND                   VA       23233       SFD         6.250
5012790      COTO DE CAZA               CA       92679       SFD         6.375
5012795      NEW HOPE                   PA       18938       SFD         6.750
5012803      HARRISON                   NY       10604       SFD         6.750
5012823      CLAYTON                    CA       94517       SFD         6.875
5012826      DOVE CANYON                CA       92679       SFD         6.375
5012839      ANN ARBOR                  MI       48104       SFD         6.625
5012849      AMBLER                     PA       19002       SFD         6.375
5012863      NEEDHAM                    MA       02492       SFD         6.625
5012865      OAKLAND                    CA       94611       SFD         6.625
5012873      MAPLE GLEN                 PA       19002       SFD         6.250
5012917      CLINTON TOWNSHIP           NJ       08801       SFD         6.500
5012927      SHELTON                    CT       06484       SFD         6.625
5012929      OLD GREENWICH              CT       06870       LCO         6.875
5012934      LONG BEACH                 CA       90807       SFD         6.750
5012937      OAKLAND                    CA       94619       SFD         6.875
5012940      RALEIGH                    NC       27615       SFD         6.500
5012946      KINGSVILLE                 MD       21087       SFD         6.500
5012952      PRINCETON TOWNSHIP         NJ       08540       SFD         6.750
5012955      NEWARK                     DE       19711       SFD         7.000
5013034      LEAWOOD                    KS       66224       SFD         6.875
5013036      OAKLAND                    NJ       07436       SFD         6.625
5013038      AURORA                     CO       80015       SFD         7.000
5013039      DURHAM                     NC       27707       PUD         6.625
5013043      CLIFTON                    VA       20124       SFD         7.000
5013044      WHITEHOUSE STATION         NJ       08889       SFD         6.750
5013047      WESTPORT                   CT       06880       SFD         6.500
5013049      DRAPER                     UT       84020       SFD         6.625
5013050      TAMPA                      FL       33647       SFD         7.000
5013058      PRINCETON TOWNSHIP         NJ       08540       SFD         6.625
5013082      LAKELAND                   FL       33809       SFD         6.625
5013087      MARIETTA                   GA       30068       SFD         7.375
5013090      BERKELEY HEIGHTS           NJ       07922       SFD         6.750
5013095      COLLIERVILLE               TN       38017       SFD         7.250
5013097      LAWRENCEVILLE              NJ       08648       SFD         7.250
5013101      TACOMA                     WA       98407       SFD         6.625
5013106      CHESTER TOWNSHIP           NJ       07930       SFD         6.250
5013110      CLAYTON                    CA       94517       SFD         6.875
5013116      LOS GATOS                  CA       95125       PUD         6.875
5013128      CANTON                     MI       48188       SFD         7.875
5013140      LA GRANGE                  KY       40031       SFD         7.375
5013141      NEWTOWN                    CT       06470       SFD         6.375
5013160      BLUE BELL                  PA       19422       SFD         6.625
5013171      NEW HAVEN                  CT       06515       SFD         6.125
5013183      CONGERS                    NY       10920       SFD         6.625
5013186      POWHATAN                   VA       23139       SFD         6.625
5013191      STAMFORD                   CT       06906       LCO         6.750
5013205      DALLAS                     TX       75230       SFD         7.000
5013208      RENTON                     WA       98056       SFD         7.000
5013210      PLANO                      TX       75093       SFD         6.875
5013213      DANA POINT                 CA       92629       SFD         6.125
5013216      SAN JUAN CAPISTRANO        CA       92675       SFD         7.000
5013222      CORNWALL                   NY       12518       SFD         6.625
5013226      PALM BEACH GARDENS         FL       33418       SFD         6.750
5013230      MADISON                    NJ       07940       SFD         6.375
5013235      LIVINGSTON                 NJ       07039       SFD         6.250
5013237      WEST CHESTER               PA       19382       SFD         6.750
5013239      BRIGHTON TOWNSHIP          MI       48114       SFD         6.500
5013250      SAN JOSE                   CA       95138       SFD         6.875
5013267      GRAYSLAKE                  IL       60030       SFD         7.000
5013271      MISSION VIEJO              CA       92692       SFD         6.625
5013293      SOUTHBURY                  CT       06488       SFD         6.500
5013302      CUMMING                    GA       30040       SFD         7.250
5013304      WESTBOROUGH                MA       01581       SFD         7.375
5013309      ORLANDO                    FL       32835       SFD         6.375
5013319      SCOTTSDALE                 AZ       85259       SFD         7.125
5013321      NEW CASTLE                 NY       10514       SFD         6.750
5013327      WESTBOROUGH                MA       01581       SFD         7.000
5013333      TRUMBULL                   CT       06611       SFD         6.125
5013349      SOUTH SALEM                NY       10590       SFD         6.625
5013351      MARIETTA                   GA       30066       SFD         6.875
5013361      BIRMINGHAM                 AL       35242       SFD         6.500
5013365      MYERSVILLE                 MD       21773       SFD         6.750
5013368      HOUSTON                    TX       77005       SFD         7.000
5013376      SOMERS                     NY       10589       SFD         6.500
5013379      SUMMIT                     NJ       07901       SFD         7.250
5013382      TAMPA                      FL       33647       SFD         6.625
5013393      CANYON                     CA       92679       SFD         6.750
5013398      SAN JUAN CAPISTRANO        CA       92675       SFD         6.625
5013422      NEW CANAAN                 CT       06840       SFD         6.875
5013432      FORT COLLINS               CO       80526       SFD         6.500
5013452      THOUSAND OAKS              CA       91361       SFD         7.250
5013466      WINDHAM                    NH       03087       SFD         6.375
5013478      HOUSTON                    TX       77024       SFD         6.625
5013582      WILDWOOD                   MO       63038       SFD         6.875
5013603      NEW YORK                   NY       10017       HCO         6.875
5013708      CLARKSTON                  MI       48348       SFD         7.000
5013721      LARCHMONT                  NY       10538       SFD         6.500
5014045      INDEPENDENCE               NJ       07882       SFD         6.500
5014094      PLANO                      TX       75025       SFD         6.625
5014108      AUSTIN                     TX       78733       SFD         7.375
5014132      MERCER ISLAND              WA       98040       SFD         7.375
5014148      MORRISTOWNSHIP             NJ       07960       SFD         7.000
5014152      CASTRO VALLEY              CA       94552       SFD         7.000
5014156      BATON ROUGE                LA       70810       SFD         7.250
5014163      STAFFORD                   VA       22554       SFD         7.250
5014166      IJAMSVILLE                 MD       21754       SFD         6.625
5014174      HERNDON                    VA       20171       SFD         6.750
5014178      BELLE MEAD                 NJ       08502       SFD         6.625
5014201      BERNARDS                   NJ       07920       SFD         6.375
5020344      NEW PROVIDENCE             NJ       07974       SFD         7.000
5023124      ANN ARBOR                  MI       48103       SFD         6.750

<PAGE>

NASCOR
NMI/1999-17 Exhibit F-2 (Part A)
30 YEAR FIXED RATE RELOCATION LOANS
(Continuation)

<CAPTION>
  (i)          (v)          (vi)         (vii)        (viii)           (ix)           (x)
- --------     --------     ---------     --------     ---------     -------------     -----
               NET                                                    CUT-OFF
MORTGAGE     MORTGAGE      CURRENT      ORIGINAL     SCHEDULED         DATE
  LOAN       INTEREST      MONTHLY      TERM TO      MATURITY        PRINCIPAL
 NUMBER        RATE        PAYMENT      MATURITY       DATE           BALANCE         LTV
- --------     --------     ---------     --------     ---------     -------------     -----
<S>          <C>          <C>           <C>          <C>           <C>               <C>
4934533       6.250       $2,188.27       360        1-Dec-28         340,225.63     79.99
4948832       6.108       $2,494.50       360        1-Mar-29         399,099.35     74.74
4956534       6.233       $6,320.68       360        1-Dec-28         995,430.70     42.39
4964742       6.250       $1,653.93       360        1-Apr-29         254,780.45     62.96
4995902       6.250       $1,872.94       360        1-Feb-29         277,329.10     84.76
4995917       6.250       $1,613.58       360        1-Jan-29         251,103.29     80.00
4995923       6.250       $1,701.60       360        1-Feb-29         261,668.54     90.05
4995936       5.983       $2,413.61       360        1-Jan-29         390,500.56     80.00
4996025       6.250       $1,622.61       360        1-Feb-29         246,354.13     71.18
4997118       6.250       $2,281.52       360        1-Apr-29         347,008.22     90.00
4998954       6.250       $1,926.83       360        1-Jan-29         284,267.26     80.00
4998965       6.250       $3,178.13       360        1-Jan-29         488,298.19     69.93
4998969       6.250       $2,218.21       360        1-Jan-29         340,812.18     80.00
4998981       6.108       $4,055.15       360        1-Feb-29         648,184.32     75.67
4998996       6.250       $1,596.73       360        1-Jan-29         239,206.17     83.33
4999000       6.250       $1,778.96       360        1-Feb-29         270,113.58     80.00
4999006       5.983       $1,785.58       360        1-Jan-29         288,890.71     94.98
4999033       6.233       $2,528.27       360        1-Jan-29         398,414.01     73.40
4999081       6.250       $1,945.79       360        1-Mar-29         299,481.97     55.40
4999125       6.250       $2,661.22       360        1-Mar-29         399,343.33     80.00
4999150       6.250       $2,315.25       360        1-Jan-29         346,848.98     80.00
4999151       6.250       $1,920.94       360        1-Mar-29         299,469.16     68.97
4999195       6.250       $1,785.34       360        1-Mar-29         267,908.78     94.99
4999324       6.250       $2,627.72       360        1-Jan-29         398,644.20     68.38
4999339       6.250       $3,252.78       360        1-Jan-29         505,270.54     80.00
4999353       6.250       $1,731.78       360        1-Jan-29         259,439.05     94.65
4999360       5.983       $1,497.42       360        1-Nov-28         241,797.32     95.00
4999373       6.250       $1,558.91       360        1-Jan-29         239,515.22     95.00
4999374       6.250       $1,686.36       360        1-Feb-29         258,719.56     87.75
4999484       6.250       $1,913.36       360        1-Jan-29         283,083.44     80.00
4999550       6.250       $1,775.58       360        1-Feb-29         276,561.99     94.97
4999644       6.233       $3,160.34       360        1-Mar-29         499,093.54     77.52
4999658       6.250       $1,634.78       360        1-Jan-29         244,907.27     80.00
4999670       6.250       $3,278.61       360        1-Feb-29         491,581.09     80.00
4999888       6.233       $1,738.95       360        1-Jan-29         274,117.02     80.00
5011782       6.250       $1,839.41       360        1-Oct-28         278,324.72     73.68
5011835       6.233       $1,580.18       360        1-Aug-28         246,698.29     63.94
5011843       6.250       $3,339.82       360        1-Aug-28         498,209.01     80.00
5011848       6.250       $2,234.88       360        1-Jan-29         339,046.86     90.00
5011861       6.233       $1,896.21       360        1-Dec-28         298,629.18     64.48
5011883       6.250       $2,202.67       360        1-Jan-29         342,774.57     80.00
5011907       6.250       $1,759.50       360        1-Feb-29         263,407.33     80.00
5011908       6.250       $1,587.77       360        1-Aug-28         242,859.82     90.00
5011959       6.250       $1,719.09       360        1-Jun-28         248,704.48     80.00
5011966       6.250       $1,839.57       360        1-Aug-28         274,411.87     69.74
5011978       6.250       $1,642.33       360        1-Aug-28         248,065.76     89.19
5011984       6.250       $2,001.01       360        1-Jan-29         303,567.55     79.99
5012015       6.233       $3,792.41       360        1-Oct-28         596,140.87     67.49
5012024       6.108       $1,821.71       360        1-Dec-28         290,417.83     80.00
5012029       5.983       $1,834.22       360        1-Dec-28         296,471.91     79.98
5012030       6.250       $1,718.79       360        1-Dec-28         246,557.78     76.81
5012038       6.250       $1,978.04       360        1-Mar-29         293,129.03     80.00
5012043       5.983       $2,156.25       360        1-Dec-28         348,226.32     85.00
5012045       6.233       $2,376.26       360        1-Sep-28         373,178.93     80.00
5012051       6.250       $1,725.28       360        1-Mar-29         265,540.65     79.44
5012053       6.250       $2,646.17       360        1-Dec-28         386,368.55     90.00
5012058       6.250       $1,817.96       360        1-Sep-28         257,539.22     72.22
5012062       6.250       $1,560.76       360        1-Dec-28         242,662.77     75.00
5012070       6.250       $1,621.50       360        1-Jul-28         247,488.81     89.29
5012092       6.233       $1,875.98       360        1-Oct-28         294,891.01     80.00
5012106       6.250       $2,039.77       360        1-Jan-29         308,991.72     90.00
5012113       6.250       $1,911.09       360        1-Sep-28         292,032.03     72.81
5012116       5.983       $2,678.37       360        1-Jul-28         430,774.46     50.58
5012118       6.108       $1,856.02       360        1-Dec-28         295,296.84     85.00
5012121       6.250       $1,676.11       360        1-Sep-28         244,132.91     90.00
5012135       6.250       $1,920.94       360        1-Dec-28         298,661.86     44.12
5012138       6.250       $2,539.27       360        1-Nov-28         389,448.85     90.00
5012145       6.108       $1,746.84       360        1-Nov-28         278,423.14     74.67
5012157       6.250       $2,075.52       360        1-Nov-28         318,323.45     74.42
5012162       5.983       $2,863.09       360        1-Nov-28         462,317.18     78.41
5012177       6.250       $2,138.60       360        1-Aug-28         327,111.68     65.98
5012196       6.250       $2,015.20       360        1-Sep-28         308,517.29     79.99
5012202       6.250       $2,950.62       360        1-Aug-28         440,150.78     79.98
5012268       6.250       $3,941.58       360        1-Jun-28         594,293.51     73.44
5012274       6.233       $1,624.42       360        1-Nov-28         255,586.96     72.08
5012276       6.250       $2,743.34       360        1-Jun-28         413,628.29     80.00
5012277       6.250       $1,699.15       360        1-Oct-28         257,102.49     79.99
5012288       6.250       $1,587.98       360        1-Jul-28         237,341.20     80.00
5012291       6.233       $2,243.85       360        1-Oct-28         352,716.39     76.34
5012304       6.250       $2,299.26       360        1-Aug-28         347,292.07     35.71
5012306       6.250       $2,243.49       360        1-Oct-28         331,100.80     52.61
5012313       6.250       $2,445.99       360        1-Jul-28         376,431.23     80.00
5012314       6.250       $1,629.19       360        1-Oct-28         246,516.20     80.00
5012356       6.250       $2,210.43       360        1-Nov-28         339,014.47     80.00
5012357       5.858       $1,579.79       360        1-Sep-28         255,566.02     52.30
5012359       6.108       $3,119.35       360        1-Aug-28         495,742.43     77.04
5012377       6.250       $1,767.26       360        1-Jul-28         273,503.49     80.00
5012383       6.250       $2,418.76       360        1-Dec-28         362,049.45     90.00
5012394       6.250       $1,815.93       360        1-Jan-29         282,590.80     80.00
5012399       6.250       $2,027.87       360        1-Oct-28         314,711.35     79.99
5012402       6.250       $1,819.32       360        1-Dec-28         279,278.79     85.00
5012405       6.233       $2,465.07       360        1-Jan-29         388,578.22     72.22
5012407       6.233       $1,845.64       360        1-Nov-28         290,394.56     80.00
5012415       6.250       $1,718.60       360        1-Jan-29         266,570.58     79.41
5012419       6.250       $2,332.10       360        1-Oct-28         352,876.05     63.83
5012455       6.250       $2,241.09       360        1-Nov-28         348,121.45     63.64
5012493       6.233       $1,943.61       360        1-Feb-29         306,661.53     75.46
5012543       6.250       $1,987.53       360        1-Aug-28         307,880.09     80.00
5012589       6.250       $1,816.08       360        1-Dec-28         278,779.10     80.00
5012599       6.250       $1,696.83       360        1-Sep-28         263,092.98     63.10
5012680       6.250       $2,154.92       360        1-Feb-29         323,098.84     90.00
5012685       6.233       $1,531.19       360        1-Dec-28         240,482.68     85.00
5012702       5.983       $2,152.55       360        1-Mar-29         348,934.84     80.00
5012710       6.250       $2,401.17       360        1-Sep-28         372,301.43     68.18
5012721       6.250       $1,921.85       360        1-Jan-29         291,558.39     79.99
5012727       6.233       $1,883.25       360        1-Sep-28         295,753.88     80.00
5012748       6.108       $1,746.84       360        1-Mar-29         279,479.94     80.00
5012752       6.250       $2,305.83       360        1-Mar-29         350,408.53     83.57
5012757       6.250       $1,725.28       360        1-Nov-28         264,606.35     79.87
5012764       6.108       $1,746.84       360        1-Mar-29         279,479.94     80.00
5012780       5.983       $2,288.01       360        1-Mar-29         370,892.98     80.00
5012790       6.108       $3,524.87       360        1-Mar-29         563,950.60     73.86
5012795       6.250       $2,270.09       360        1-Feb-29         349,090.88     79.78
5012803       6.250       $3,729.44       360        1-Oct-28         571,475.51     74.19
5012823       6.250       $2,003.64       360        1-Dec-28         303,704.02     65.59
5012826       6.108       $2,144.87       360        1-Mar-29         343,161.45     90.00
5012839       6.250       $1,760.86       360        1-Mar-29         274,513.40     64.71
5012849       6.108       $2,295.85       360        1-Mar-29         366,799.37     80.00
5012863       6.250       $2,868.60       360        1-Dec-28         446,001.72     80.00
5012865       6.250       $2,305.12       360        1-Feb-29         359,041.87     80.00
5012873       5.983       $1,693.23       360        1-Mar-29         274,476.76     74.32
5012917       6.233       $1,580.18       360        1-Sep-28         246,725.44     58.14
5012927       6.250       $1,649.45       360        1-Feb-29         256,914.38     80.00
5012929       6.250       $1,655.47       360        1-Oct-28         250,492.26     80.00
5012934       6.250       $2,101.46       360        1-Jan-29         322,874.71     80.00
5012937       6.250       $2,496.33       360        1-Sep-28         377,394.20     80.00
5012940       6.233       $2,123.75       360        1-Jan-29         334,725.04     78.32
5012946       6.233       $1,896.21       360        1-Feb-29         298,774.85     78.95
5012952       6.250       $2,347.93       360        1-Aug-28         357,972.19     62.96
5012955       6.250       $1,694.53       360        1-Sep-28         252,995.27     90.00
5013034       6.250       $2,185.73       360        1-Nov-28         331,018.68     80.00
5013036       6.250       $1,714.76       360        1-Apr-28         259,782.10     74.99
5013038       6.250       $3,832.15       360        1-Jun-28         570,652.20     80.00
5013039       6.250       $1,551.71       360        1-Sep-28         240,592.10     85.93
5013043       6.250       $1,829.59       360        1-Apr-28         271,546.87     49.64
5013044       6.250       $1,815.43       360        1-Aug-28         277,681.62     79.99
5013047       6.233       $2,082.67       360        1-Nov-28         327,688.36     89.17
5013049       6.250       $1,728.84       360        1-Sep-28         267,425.33     67.52
5013050       6.250       $2,633.94       360        1-Jan-28         387,036.23     90.00
5013058       6.250       $2,561.25       360        1-Oct-28         397,488.28     45.18
5013082       6.250       $1,626.39       360        1-Oct-28         252,405.09     89.44
5013087       6.250       $1,747.41       360        1-Jan-29         252,222.23     84.62
5013090       6.250       $2,334.31       360        1-Dec-28         358,332.16     80.00
5013095       6.250       $1,688.39       360        1-Jan-29         246,720.64     79.71
5013097       6.250       $2,455.83       360        1-Sep-28         357,705.31     80.00
5013101       6.250       $2,535.64       360        1-Jan-29         394,590.82     80.00
5013106       5.983       $1,785.58       360        1-Jan-29         288,342.31     49.15
5013110       6.250       $2,070.64       360        1-Dec-28         313,860.71     80.00
5013116       6.250       $2,154.73       360        1-Jan-29         326,888.20     80.00
5013128       6.250       $1,747.42       360        1-Dec-28         240,159.72     89.79
5013140       6.250       $1,830.29       360        1-Jan-29         264,186.01     87.75
5013141       6.108       $1,559.68       360        1-Dec-28         248,829.86     55.57
5013160       6.250       $2,207.15       360        1-Nov-28         342,849.93     80.00
5013171       5.858       $1,744.45       360        1-Nov-28         285,404.23     87.26
5013183       6.250       $1,728.84       360        1-Nov-28         268,550.85     74.34
5013186       6.250       $1,829.69       360        1-Oct-28         283,955.72     90.00
5013191       6.250       $1,848.51       360        1-Dec-28         283,759.20     74.24
5013205       6.250       $1,836.24       360        1-Oct-28         274,388.33     80.00
5013208       6.250       $1,709.83       360        1-Jul-28         254,837.21     79.81
5013210       6.250       $2,282.18       360        1-Oct-28         345,212.38     80.00
5013213       5.858       $2,376.98       360        1-Dec-28         389,135.28     80.00
5013216       6.250       $2,403.74       360        1-Jun-28         356,681.21     80.00
5013222       6.250       $1,786.47       360        1-Oct-28         277,248.09     94.26
5013226       6.250       $2,231.18       360        1-Oct-28         341,891.42     80.00
5013230       6.108       $2,213.50       360        1-Nov-28         352,801.88     80.00
5013235       5.983       $2,610.65       360        1-Jan-29         422,378.11     80.00
5013237       6.250       $1,809.59       360        1-Oct-28         277,289.86     90.00
5013239       6.233       $1,668.66       360        1-Oct-28         262,301.66     80.00
5013250       6.250       $2,394.51       360        1-Oct-28         359,867.57     50.00
5013267       6.250       $1,861.19       360        1-Sep-28         277,877.60     89.99
5013271       6.250       $1,920.94       360        1-Oct-28         298,116.20     80.00
5013293       6.233       $2,085.83       360        1-Jul-28         325,414.39     68.89
5013302       6.250       $3,698.08       360        1-Oct-28         539,085.55     79.90
5013304       6.250       $2,641.84       360        1-Sep-28         379,017.54     90.00
5013309       6.108       $1,640.78       360        1-Oct-28         261,267.43     79.72
5013319       6.250       $1,845.99       360        1-Aug-28         271,980.47     78.85
5013321       6.250       $2,724.12       360        1-Aug-28         416,670.26     80.00
5013327       6.250       $2,328.56       360        1-Sep-28         347,439.35     63.97
5013333       5.858       $2,381.84       360        1-Nov-28         389,684.58     79.80
5013349       6.250       $2,095.10       360        1-Sep-28         323,828.72     80.00
5013351       6.250       $1,634.12       360        1-Oct-28         247,261.68     67.45
5013361       6.233       $1,718.60       360        1-Jul-28         269,380.43     79.99
5013365       6.250       $1,634.47       360        1-Aug-28         250,002.75     90.00
5013368       6.250       $2,311.60       360        1-Jul-28         344,526.00     84.99
5013376       6.233       $3,014.34       360        1-Nov-28         474,277.92     79.99
5013379       6.250       $4,093.06       360        1-Sep-28         596,163.94     72.73
5013382       6.250       $2,081.02       360        1-Sep-28         322,661.20     61.90
5013393       6.250       $2,749.74       360        1-Sep-28         420,971.69     80.00
5013398       6.250       $2,081.02       360        1-Oct-28         322,959.22     73.06
5013422       6.250       $3,916.94       360        1-Oct-28         592,682.70     75.00
5013432       6.233       $1,927.81       360        1-Aug-28         302,464.01     79.22
5013452       6.250       $3,301.74       360        1-Aug-28         480,518.56     80.00
5013466       6.108       $1,780.53       360        1-Sep-28         282,533.83     85.59
5013478       6.250       $1,920.94       360        1-Oct-28         298,116.20     80.00
5013582       6.250       $1,652.18       360        1-Aug-28         249,554.17     84.82
5013603       6.250       $3,126.99       360        1-Oct-28         473,152.08     80.00
5013708       6.250       $2,082.40       360        1-Sep-28         310,902.63     75.79
5013721       6.233       $1,580.18       360        1-Oct-28         248,391.96     63.29
5014045       6.233       $1,823.52       360        1-Oct-28         286,363.41     90.00
5014094       6.250       $1,773.66       360        1-Feb-29         276,262.76     87.38
5014108       6.250       $1,690.77       360        1-Jan-29         244,048.02     80.00
5014132       6.250       $3,798.71       360        1-Dec-28         547,881.61     73.43
5014148       6.250       $1,902.77       360        1-Jun-28         283,344.66     79.89
5014152       6.250       $1,763.72       360        1-Dec-28         263,852.59     74.99
5014156       6.250       $1,994.68       360        1-Nov-28         291,010.58     90.00
5014163       6.250       $1,713.63       360        1-Dec-28         250,207.56     80.00
5014166       6.250       $1,728.20       360        1-Oct-28         268,077.36     85.00
5014174       6.250       $1,712.30       360        1-Dec-28         262,850.64     80.00
5014178       6.250       $1,587.97       360        1-Jan-29         246,820.35     79.99
5014201       6.108       $2,133.64       360        1-Sep-28         339,418.26     90.00
5020344       6.250       $1,676.57       360        1-Jan-29         250,286.39     90.00
5023124       6.250       $2,010.66       360        1-Jan-29         307,915.97     77.42
                                                                   -------------
                                                                   69,899,417.36

<PAGE>

NASCOR
NMI/1999-17 Exhibit F-2 (Part A)
30 YEAR FIXED RATE RELOCATION LOANS
(Continuation)

<CAPTION>
  (i)         (xi)         (xii)       (xiii)      (xiv)         (xv)        (xvi)
- --------     -------     ---------     -------     --------     -------     --------
MORTGAGE                 MORTGAGE                  T.O.P.       MASTER       FIXED
  LOAN                   INSURANCE     SERVICE     MORTGAGE     SERVICE     RETAINED
 NUMBER      SUBSIDY       CODE          FEE       LOAN           FEE        YIELD
- --------     -------     ---------     -------     --------     -------     --------
<S>          <C>         <C>           <C>         <C>          <C>         <C>
4934533                                 0.250                    0.017       0.108
4948832                                 0.250                    0.017       0.000
4956534                                 0.250                    0.017       0.000
4964742                                 0.250                    0.017       0.233
4995902                     11          0.250                    0.017       0.608
4995917                                 0.250                    0.017       0.108
4995923                     11          0.250                    0.017       0.233
4995936                                 0.250                    0.017       0.000
4996025                                 0.250                    0.017       0.358
4997118                                 0.250                    0.017       0.358
4998954                                 0.250                    0.017       0.608
4998965                                 0.250                    0.017       0.233
4998969                                 0.250                    0.017       0.233
4998981                                 0.250                    0.017       0.000
4998996                     12          0.250                    0.017       0.483
4999000                                 0.250                    0.017       0.358
4999006                     11          0.250                    0.017       0.000
4999033                                 0.250                    0.017       0.000
4999081                                 0.250                    0.017       0.233
4999125                                 0.250                    0.017       0.483
4999150                                 0.250                    0.017       0.483
4999151                                 0.250                    0.017       0.108
4999195                     06          0.250                    0.017       0.483
4999324                                 0.250                    0.017       0.358
4999339                                 0.250                    0.017       0.108
4999353                     11          0.250                    0.017       0.483
4999360                     06          0.250                    0.017       0.000
4999373                     12          0.250                    0.017       0.233
4999374                     11          0.250                    0.017       0.233
4999484                                 0.250                    0.017       0.608
4999550                     11          0.250                    0.017       0.108
4999644                                 0.250                    0.017       0.000
4999658                                 0.250                    0.017       0.483
4999670                                 0.250                    0.017       0.483
4999888                                 0.250                    0.017       0.000
5011782                                 0.608                    0.017       0.000
5011835                                 0.250                    0.017       0.000
5011843                                 0.733                    0.017       0.000
5011848                     11          0.608                    0.017       0.000
5011861                                 0.250                    0.017       0.000
5011883                                 0.358                    0.017       0.000
5011907                                 0.733                    0.017       0.000
5011908                     12          0.483                    0.017       0.000
5011959                                 0.983                    0.017       0.000
5011966                                 0.733                    0.017       0.000
5011978                     11          0.608                    0.017       0.000
5011984                                 0.608                    0.017       0.000
5012015                                 0.250                    0.017       0.000
5012024                                 0.250                    0.017       0.000
5012029                                 0.250                    0.017       0.000
5012030                                 0.483                    0.017       0.000
5012038                                 0.858                    0.017       0.000
5012043                     01          0.250                    0.017       0.000
5012045                                 0.250                    0.017       0.000
5012051                                 0.483                    0.017       0.000
5012053                     11          0.983                    0.017       0.000
5012058                                 1.233                    0.017       0.000
5012062                                 0.358                    0.017       0.000
5012070                     11          0.483                    0.017       0.000
5012092                                 0.250                    0.017       0.000
5012106                     11          0.608                    0.017       0.000
5012113                                 0.483                    0.017       0.000
5012116                                 0.250                    0.017       0.000
5012118                     11          0.250                    0.017       0.000
5012121                     01          0.983                    0.017       0.000
5012135                                 0.358                    0.017       0.000
5012138                     01          0.483                    0.017       0.000
5012145                                 0.250                    0.017       0.000
5012157                                 0.483                    0.017       0.000
5012162                                 0.250                    0.017       0.000
5012177                                 0.483                    0.017       0.000
5012196                                 0.483                    0.017       0.000
5012202                                 0.733                    0.017       0.000
5012268                                 0.608                    0.017       0.000
5012274                                 0.250                    0.017       0.000
5012276                                 0.608                    0.017       0.000
5012277                                 0.608                    0.017       0.000
5012288                                 0.358                    0.017       0.000
5012291                                 0.250                    0.017       0.000
5012304                                 0.608                    0.017       0.000
5012306                                 0.858                    0.017       0.000
5012313                                 0.358                    0.017       0.000
5012314                                 0.608                    0.017       0.000
5012356                                 0.483                    0.017       0.000
5012357                                 0.250                    0.017       0.000
5012359                                 0.250                    0.017       0.000
5012377                                 0.358                    0.017       0.000
5012383                     01          0.733                    0.017       0.000
5012394                                 0.358                    0.017       0.000
5012399                                 0.358                    0.017       0.000
5012402                     01          0.483                    0.017       0.000
5012405                                 0.250                    0.017       0.000
5012407                                 0.250                    0.017       0.000
5012415                                 0.358                    0.017       0.000
5012419                                 0.608                    0.017       0.000
5012455                                 0.358                    0.017       0.000
5012493                                 0.250                    0.017       0.000
5012543                                 0.358                    0.017       0.000
5012589                                 0.483                    0.017       0.000
5012599                                 0.358                    0.017       0.000
5012680                     11          0.733                    0.017       0.000
5012685                     12          0.250                    0.017       0.000
5012702                                 0.250                    0.017       0.000
5012710                                 0.358                    0.017       0.000
5012721                                 0.608                    0.017       0.000
5012727                                 0.250                    0.017       0.000
5012748                                 0.250                    0.017       0.000
5012752                     11          0.608                    0.017       0.000
5012757                                 0.483                    0.017       0.000
5012764                                 0.250                    0.017       0.000
5012780                                 0.250                    0.017       0.000
5012790                                 0.250                    0.017       0.000
5012795                                 0.483                    0.017       0.000
5012803                                 0.483                    0.017       0.000
5012823                                 0.608                    0.017       0.000
5012826                     01          0.250                    0.017       0.000
5012839                                 0.358                    0.017       0.000
5012849                                 0.250                    0.017       0.000
5012863                                 0.358                    0.017       0.000
5012865                                 0.358                    0.017       0.000
5012873                                 0.250                    0.017       0.000
5012917                                 0.250                    0.017       0.000
5012927                                 0.358                    0.017       0.000
5012929                                 0.608                    0.017       0.000
5012934                                 0.483                    0.017       0.000
5012937                                 0.608                    0.017       0.000
5012940                                 0.250                    0.017       0.000
5012946                                 0.250                    0.017       0.000
5012952                                 0.483                    0.017       0.000
5012955                     11          0.733                    0.017       0.000
5013034                                 0.608                    0.017       0.000
5013036                                 0.358                    0.017       0.000
5013038                                 0.733                    0.017       0.000
5013039                                 0.358                    0.017       0.000
5013043                                 0.733                    0.017       0.000
5013044                                 0.483                    0.017       0.000
5013047                     12          0.250                    0.017       0.000
5013049                                 0.358                    0.017       0.000
5013050                     11          0.733                    0.017       0.000
5013058                                 0.358                    0.017       0.000
5013082                                 0.358                    0.017       0.000
5013087                     33          1.108                    0.017       0.000
5013090                                 0.483                    0.017       0.000
5013095                                 0.983                    0.017       0.000
5013097                                 0.983                    0.017       0.000
5013101                                 0.358                    0.017       0.000
5013106                                 0.250                    0.017       0.000
5013110                                 0.608                    0.017       0.000
5013116                                 0.608                    0.017       0.000
5013128                     33          1.608                    0.017       0.000
5013140                     01          1.108                    0.017       0.000
5013141                                 0.250                    0.017       0.000
5013160                                 0.358                    0.017       0.000
5013171                     12          0.250                    0.017       0.000
5013183                                 0.358                    0.017       0.000
5013186                     01          0.358                    0.017       0.000
5013191                                 0.483                    0.017       0.000
5013205                                 0.733                    0.017       0.000
5013208                                 0.733                    0.017       0.000
5013210                                 0.608                    0.017       0.000
5013213                                 0.250                    0.017       0.000
5013216                                 0.733                    0.017       0.000
5013222                     12          0.358                    0.017       0.000
5013226                                 0.483                    0.017       0.000
5013230                                 0.250                    0.017       0.000
5013235                                 0.250                    0.017       0.000
5013237                     01          0.483                    0.017       0.000
5013239                                 0.250                    0.017       0.000
5013250                                 0.608                    0.017       0.000
5013267                     11          0.733                    0.017       0.000
5013271                                 0.358                    0.017       0.000
5013293                                 0.250                    0.017       0.000
5013302                                 0.983                    0.017       0.000
5013304                     11          1.108                    0.017       0.000
5013309                                 0.250                    0.017       0.000
5013319                                 0.858                    0.017       0.000
5013321                                 0.483                    0.017       0.000
5013327                                 0.733                    0.017       0.000
5013333                                 0.250                    0.017       0.000
5013349                                 0.358                    0.017       0.000
5013351                                 0.608                    0.017       0.000
5013361                                 0.250                    0.017       0.000
5013365                     11          0.483                    0.017       0.000
5013368                     12          0.733                    0.017       0.000
5013376                                 0.250                    0.017       0.000
5013379                                 0.983                    0.017       0.000
5013382                                 0.358                    0.017       0.000
5013393                                 0.483                    0.017       0.000
5013398                                 0.358                    0.017       0.000
5013422                                 0.608                    0.017       0.000
5013432                                 0.250                    0.017       0.000
5013452                                 0.983                    0.017       0.000
5013466                     12          0.250                    0.017       0.000
5013478                                 0.358                    0.017       0.000
5013582                     12          0.608                    0.017       0.000
5013603                                 0.608                    0.017       0.000
5013708                                 0.733                    0.017       0.000
5013721                                 0.250                    0.017       0.000
5014045                     12          0.250                    0.017       0.000
5014094                     01          0.358                    0.017       0.000
5014108                                 1.108                    0.017       0.000
5014132                                 1.108                    0.017       0.000
5014148                                 0.733                    0.017       0.000
5014152                                 0.733                    0.017       0.000
5014156                     01          0.983                    0.017       0.000
5014163                                 0.983                    0.017       0.000
5014166                     01          0.358                    0.017       0.000
5014174                                 0.483                    0.017       0.000
5014178                                 0.358                    0.017       0.000
5014201                                 0.250                    0.017       0.000
5020344                     11          0.733                    0.017       0.000
5023124                                 0.483                    0.017       0.000

<PAGE>

COUNT:                212
WAC:          6.728064338
WAM:          353.9970074
WALTV:        77.31230532
</TABLE>

<PAGE>

NASCOR
NMI/1999-17 Exhibit F-2 (Part B)
30 YEAR FIXED RATE RELOCATION LOANS

  (i)                  (xvii)                        (xviii)
- --------     --------------------------     --------------------------
MORTGAGE                                               NMI
  LOAN                                                 LOAN
 NUMBER               SERVICER                        SELLER
- --------     --------------------------     --------------------------
4934533      GMAC MORTGAGE CORP             GMAC MORTGAGE CORP
4948832      HUNTINGTON MORTGAGE COMPAN     HUNTINGTON MORTGAGE COMPAN
4956534      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4964742      HUNTINGTON MORTGAGE COMPAN     HUNTINGTON MORTGAGE COMPAN
4995902      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4995917      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4995923      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4995936      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4996025      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4997118      HUNTINGTON MORTGAGE COMPAN     HUNTINGTON MORTGAGE COMPAN
4998954      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4998965      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4998969      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4998981      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4998996      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999000      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999006      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999033      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999081      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999125      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999150      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999151      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999195      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999324      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999339      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999353      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999360      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999373      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999374      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999484      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999550      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999644      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999658      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999670      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
4999888      FIRST UNION MORTGAGE CORP      FIRST UNION MORTGAGE CORP
5011782      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5011835      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5011843      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5011848      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5011861      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5011883      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5011907      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5011908      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5011959      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5011966      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5011978      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5011984      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012015      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012024      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012029      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012030      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012038      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012043      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012045      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012051      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012053      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012058      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012062      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012070      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012092      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012106      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012113      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012116      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012118      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012121      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012135      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012138      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012145      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012157      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012162      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012177      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012196      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012202      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012268      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012274      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012276      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012277      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012288      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012291      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012304      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012306      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012313      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012314      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012356      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012357      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012359      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012377      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012383      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012394      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012399      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012402      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012405      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012407      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012415      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012419      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012455      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012493      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012543      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012589      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012599      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012680      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012685      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012702      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012710      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012721      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012727      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012748      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012752      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012757      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012764      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012780      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012790      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012795      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012803      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012823      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012826      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012839      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012849      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012863      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012865      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012873      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012917      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012927      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012929      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012934      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012937      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012940      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012946      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012952      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5012955      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013034      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013036      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013038      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013039      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013043      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013044      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013047      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013049      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013050      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013058      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013082      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013087      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013090      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013095      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013097      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013101      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013106      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013110      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013116      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013128      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013140      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013141      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013160      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013171      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013183      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013186      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013191      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013205      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013208      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013210      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013213      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013216      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013222      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013226      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013230      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013235      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013237      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013239      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013250      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013267      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013271      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013293      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013302      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013304      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013309      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013319      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013321      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013327      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013333      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013349      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013351      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013361      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013365      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013368      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013376      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013379      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013382      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013393      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013398      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013422      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013432      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013452      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013466      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013478      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013582      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013603      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013708      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5013721      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014045      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014094      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014108      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014132      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014148      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014152      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014156      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014163      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014166      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014174      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014178      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5014201      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5020344      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.
5023124      CITICORP MORTGAGE, INC.        CITICORP MORTGAGE, INC.

COUNT:                    212
WAC:              6.728064338
WAM:              353.9970074
WALTV:            77.31230532


<PAGE>

                                    EXHIBIT G

                               REQUEST FOR RELEASE

                       (for Trust Administrator/Custodian)


Loan Information

     Name of Mortgagor:                 ____________________

     Servicer
     Loan No.:                          ____________________

Custodian/Trust Administrator

     Name:                              ____________________

     Address:                           ____________________

                                        ____________________

     Custodian/Trustee
     Mortgage File No.:                 ____________________

Seller

     Name:                              ____________________

     Address:                           ____________________

                                        ____________________

     Certificates:                      Mortgage Pass-Through Certificates,
                                        Series 1999-17

          The  undersigned  Master  Servicer  hereby  acknowledges  that  it has
received from First Union National Bank, as Trust  Administrator for the Holders
of Mortgage Pass-Through Certificates, Series 1999-17, the documents referred to
below (the  "Documents").  All capitalized  terms not otherwise  defined in this
Request  for  Release  shall have the  meanings  given them in the  Pooling  and
Servicing  Agreement  dated  as of May 26,  1999  (the  "Pooling  and  Servicing
Agreement") among the Trust  Administrator,  the Seller, the Master Servicer and
the United States Trust Company of New York, as Trustee.

( )  Promissory Note dated _______________, 199__, in the original principal sum
     of $____________, made by ____________________,  payable to, or endorsed to
     the order of, the Trustee.

( )  Mortgage recorded on  ____________________  as instrument no. __________ in
     the County  Recorder's  Office of the County of  _______________,  State of
     _______________  in  book/reel/docket  __________  of  official  records at
     page/image __________.

( )  Deed of Trust recorded on ____________________ as instrument no. __________
     in the County Recorder's Office of the County of _______________,  State of
     _______________  in  book/reel/docket  __________  of  official  records at
     page/image __________.

( )  Assignment  of  Mortgage  or Deed of  Trust  to the  Trustee,  recorded  on
     ____________________  as instrument no. __________ in the County Recorder's
     Office  of the  County  of  _______________,  State of  _______________  in
     book/reel/docket __________ of official records at page/image __________.

( )  Other documents, including any amendments, assignments or other assumptions
     of the Mortgage Note or Mortgage.

     ( ) _____________________________________________

     ( ) _____________________________________________

     ( ) _____________________________________________

     ( ) _____________________________________________

     The undersigned Master Servicer hereby acknowledges and agrees as follows:

          (1) The  Master  Servicer  shall  hold and  retain  possession  of the
     Documents in trust for the benefit of the Trustee,  solely for the purposes
     provided in the Agreement.

          (2) The Master  Servicer  shall not cause or permit the  Documents  to
     become subject to, or encumbered by, any claim,  liens,  security interest,
     charges,  writs of  attachment  or other  impositions  nor shall the Master
     Servicer  assert  or seek to  assert  any  claims or rights of setoff to or
     against the Documents or any proceeds thereof.

          (3) The  Master  Servicer  shall  return  the  Documents  to the Trust
     Administrator when the need therefor no longer exists,  unless the Mortgage
     Loan relating to the Documents has been liquidated and the proceeds thereof
     have been  remitted  to the  Certificate  Account  and except as  expressly
     provided in the Agreement.

          (4) The Documents and any proceeds thereof,  including any proceeds of
     proceeds,  coming  into the  possession  or control of the Master  Servicer
     shall at all times be earmarked for the account of the Trust Administrator,
     on behalf of the Trustee,  and the Master Servicer shall keep the Documents
     and any  proceeds  separate  and  distinct  from all other  property in the
     Master Servicer's possession, custody or control.

<PAGE>

                                        NORWEST BANK MINNESOTA, NATIONAL
                                        ASSOCIATION


                                        By:     ___________________________
                                        Title:  ___________________________
                                        Date:   _______________, 19__

<PAGE>

                                    EXHIBIT H

                                            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  Norwest Asset  Securities  Corporation  Mortgage
Pass-Through Certificates, Series 1999-17, Class A-R Certificate (the "Class A-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 or other
retirement  arrangement  subject to Title I of the  Employee  Retirement  Income
Security  Act  of  1974,  as  amended  ("ERISA"),  or  Code  Section  4975  or a
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 acting on
behalf of or investing the assets of such a Plan.

          4.  That the  Purchaser  historically  has paid its debts as they have
come due and  intends  to pay its debts as they come due in the  future  and the
Purchaser intends to pay taxes associated with holding the Class A-R Certificate
as they become due.

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

          6. That the Purchaser  will not transfer the Class A-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 a U.S.  Person or (ii) is a person other
than a U.S. Person (a "Non-U.S. Person") that holds the Class A-R Certificate in
connection  with the conduct of a trade or business within the United States and
has  furnished  the  transferor  and the Trust  Administrator  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 Trust  Administrator  an opinion  of a  nationally
recognized  tax  counsel  to the  effect  that the  transfer  of the  Class  A-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 A-R
Certificate  will not be  disregarded  for federal  income tax  purposes.  "U.S.
Person"  means a citizen or  resident of the United  States,  a  corporation  or
partnership  (unless,  in the case of a partnership,  Treasury  regulations  are
adopted that provide otherwise) created or organized in or under the laws of the
United  States,  any state  thereof or the  District of  Columbia,  including an
entity treated as a corporation or partnership  for federal income tax purposes,
an estate whose income is subject to United States federal income tax regardless
of its  source,  or a trust  if a court  within  the  United  States  is able to
exercise primary  supervision over the  administration of such trust, and one or
more such U.S.  Persons have the authority to control all substantial  decisions
of such trust (or, to the extent  provided in applicable  Treasury  regulations,
certain  trusts in existence on August 20, 1996 which are eligible to be treated
as U.S. Persons).

          8. That the  Purchaser  agrees to such  amendments  of the Pooling and
Servicing Agreement as may be required to further effectuate the restrictions on
transfer of the Class A-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  Master
Servicer as its agent to act as "tax  matters  person" of the REMIC  pursuant to
Section 3.01 of the Pooling and Servicing 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 I

                [Letter from Transferor of Class A-R Certificate]

                                     [Date]

First Union National Bank
230 South Tryon Street
Charlotte, North Carolina  28288

Re:  Norwest Asset Securities Corporation,
     Series 1999-17, Class A-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 J

                      NORWEST ASSET SECURITIES CORPORATION

                       MORTGAGE PASS-THROUGH CERTIFICATES

                                 SERIES 1999-17

                    CLASS [A-PO][B-4][B-5][B-6] CERTIFICATES

                               TRANSFEREE'S LETTER


                                        ____________ __, ____

First Union National Bank
230 South Tryon Street
Charlotte, North Carolina  28288

Norwest Asset Securities Corporation
7485 New Horizon Way
Frederick, Maryland  21703

          The undersigned (the  "Purchaser")  proposes to purchase Norwest Asset
Securities Corporation Mortgage Pass-Through Certificates, Series 1999-17, Class
[A-PO][B-4][B-5][B-6]    Certificates    (the    "Class    [A-PO][B-4][B-5][B-6]
Certificates")  in the  principal  amount  of  $___________.  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  ascribed to it in the Pooling
and  Servicing  Agreement,  dated as of May 26, 1999 (the "Pooling and Servicing
Agreement")  among  Norwest  Asset  Securities   Corporation,   as  seller  (the
"Seller"), Norwest Bank Minnesota, National Association, as master servicer (the
"Master  Servicer"),  First Union  National  Bank, as trust  administrator  (the
"Trust  Administrator")  and the United  States  Trust  Company of New York,  as
trustee  (the  "Trustee"),  of Norwest  Asset  Securities  Corporation  Mortgage
Pass-Through Certificates, Series 1999-17.

          Section  2.  REPRESENTATIONS  AND  WARRANTIES  OF  THE  PURCHASER.  In
connection with the proposed transfer,  the Purchaser represents and warrants to
the Seller, the Master Servicer and the Trust Administrator that:

          (a) The  Purchaser  is duly  organized,  validly  existing and in good
standing under the laws of the jurisdiction in which the Purchaser is organized,
is authorized to invest in the Class [A-PO][B-4][B-5][B-6]  Certificates, and to
enter into this Agreement, and duly executed and delivered this Agreement.

          (b)  The  Purchaser  is  acquiring  the  Class   [A-PO][B-4][B-5][B-6]
Certificates  for its  own  account  as  principal  and  not  with a view to the
distribution thereof, in whole or in part.

          (c) [The Purchaser has knowledge of financial and business matters and
is capable of  evaluating  the  merits and risks of an  investment  in the Class
[A-PO][B-4][B-5][B-6]  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  [A-PO][B-4][B-5][B-6]  Certificates  and can  afford a
complete loss of such investment.]

          (c) [The  Purchaser is a "Qualified  Institutional  Buyer"  within the
meaning of Rule 144A of the Act.]

          (d) The  Purchaser  confirms  that (a) it has  received and reviewed a
copy of the Private Placement  Memorandum dated __________ __, 19__, relating to
the Class  [A-PO][B-4][B-5][B-6]  Certificates  and  reviewed,  to the extent it
deemed appropriate,  the documents attached thereto or incorporated by reference
therein, (b) it has had the opportunity to ask questions of, and receive answers
from the Seller concerning the Class [A-PO][B-4][B-5][B-6]  Certificates and all
matters  relating  thereto,  and obtain any  additional  information  (including
documents) relevant to its decision to purchase the Class  [A-PO][B-4][B-5][B-6]
Certificates  that the Seller  possesses  or can  possess  without  unreasonable
effort or expense and (c) it has undertaken its own independent  analysis of the
investment in the Class [A-PO][B-4][B-5][B-6]  Certificates.  The Purchaser will
not use or disclose any  information it receives in connection with its purchase
of the Class [A-PO][B-4][B-5][B-6]  Certificates other than in connection with a
subsequent sale of Class [A-PO][B-4][B-5][B-6] Certificates.

          (e) Either (i) the Purchaser is not an employee  benefit plan or other
retirement  arrangement  subject to Title I 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 a  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) [for Class
[B-4][B-5][B-6] Certificates only] if the Purchaser is an insurance company, (A)
the source of funds used to purchase the Class [B-4][B-5][B-6] 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),  (B) 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  exceeds 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  and (C) the purchase and holding of such
Class  [B-4][B-5][B-6]  Certificates  are  covered by  Sections I and III of PTE
95-60  or  (iii)  the  Purchaser  has  provided  (a) a  "Benefit  Plan  Opinion"
satisfactory to the Seller and the Trust  Administrator  of the Trust Estate and
(b) such other opinions of counsel, officers' certificates and agreements as the
Seller or the Master  Servicer may have  required.  A Benefit Plan Opinion is an
opinion of counsel to the effect that the proposed  transfer  will not cause the
assets of the Trust  Estate to be regarded  as "plan  assets" and subject to the
prohibited transaction provisions of ERISA, the Code or Similar Law and will not
subject the Trust Administrator,  the Trustee, the Seller or the Master Servicer
to any  obligation in addition to those  undertaken in the Pooling and Servicing
Agreement  (including any liability for civil  penalties or excise taxes imposed
pursuant to ERISA, Section 4975 of the Code or Similar Law).

          (f)  If the  Purchaser  is a  depository  institution  subject  to the
jurisdiction of the Office of the Comptroller of the Currency ("OCC"), the Board
of  Governors  of the  Federal  Reserve  System  ("FRB"),  the  Federal  Deposit
Insurance Corporation ("FDIC"),  the Office of Thrift Supervision ("OTS") or the
National Credit Union  Administration  ("NCUA"),  the Purchaser has reviewed the
"Supervisory  Policy Statement on Securities  Activities" dated January 28, 1992
of the Federal Financial Institutions Examination Council and the April 15, 1994
Interim  Revision  thereto as adopted by the OCC, FRB,  FDIC, OTS and NCUA (with
modifications  as  applicable),  as  appropriate,  other  applicable  investment
authority,  rules, supervisory policies and guidelines of these agencies and, to
the extent  appropriate,  state banking  authorities  and has concluded that its
purchase  of  the  Class  [A-PO][B-4][B-5][B-6]  Certificates  is in  compliance
therewith.

          Section 3. TRANSFER OF CLASS [A-PO][B-4][B-5][B-6] CERTIFICATES.

          (a) The  Purchaser  understands  that the Class  [A-PO][B-4][B-5][B-6]
Certificates  have not been  registered  under the  Securities  Act of 1933 (the
"Act") or any state  securities laws and that no transfer may be made unless the
Class  [A-PO][B-4][B-5][B-6]  Certificates  are  registered  under  the  Act and
applicable state law or unless an exemption from registration is available.  The
Purchaser further  understands that neither the Seller,  the Master Servicer nor
the  Trust   Administrator  is  under  any  obligation  to  register  the  Class
[A-PO][B-4][B-5][B-6]  Certificates or make an exemption available. In the event
that such a transfer is to be made in reliance upon an exemption from the Act or
applicable state securities laws, (i) the Trust  Administrator shall require, in
order  to  assure  compliance  with  such  laws,  that  the  Certificateholder's
prospective  transferee certify to the Seller and the Trust  Administrator as to
the factual basis for the registration or  qualification  exemption relied upon,
and (ii) unless the transferee is a "Qualified  Institutional  Buyer" within the
meaning of Rule 144A of the Act, the Trust  Administrator  or the Seller may, if
such  transfer is made within three years from the later of (a) the Closing Date
or (b) the last date on which the Seller or any  affiliate  thereof was a holder
of the  Certificates  proposed to be transferred,  require an Opinion of Counsel
that such transfer may be made  pursuant to an exemption  from the Act and state
securities  laws,  which Opinion of Counsel shall not be an expense of the Trust
Administrator,  the Master  Servicer or the Seller.  Any such  Certificateholder
desiring to effect such transfer shall,  and does hereby agree to, indemnify the
Trustee, the Trust Administrator,  the Master Servicer,  any Paying Agent acting
on behalf of the Trust  Administrator  and the Seller against any liability that
may result if the  transfer is not so exempt or is not made in  accordance  with
such federal and state laws.

          (b) No transfer of a Class [A-PO][B-4][B-5][B-6]  Certificate shall be
made unless the transferee  provides the Seller and the Trust Administrator with
a Transferee's Letter, substantially in the form of this Agreement.

          (c) The Purchaser  acknowledges  that its Class  [A-PO][B-4][B-5][B-6]
Certificates  bear  a  legend  setting  forth  the  applicable  restrictions  on
transfer.

<PAGE>

          IN WITNESS  WHEREOF,  the  undersigned has caused this Agreement to be
validly  executed by its duly  authorized  representative  as of the day and the
year first above written.

                                        [PURCHASER]


                                        By:   _____________________________

                                        Its:  _____________________________

<PAGE>

                                    EXHIBIT K

                      NORWEST ASSET SECURITIES CORPORATION

                       MORTGAGE PASS-THROUGH CERTIFICATES

                                 SERIES 1999-17

                      CLASS [B-1] [B-2] [B-3] CERTIFICATES

                               TRANSFEREE'S LETTER


                                        ____________ __, ____

First Union National Bank
230 South Tryon Street
Charlotte, North Carolina  28288

Norwest Asset Securities Corporation
7485 New Horizon Way
Frederick, Maryland  21703

          The undersigned (the  "Purchaser")  proposes to purchase Norwest Asset
Securities Corporation Mortgage Pass-Through Certificates, Series 1999-17, Class
[B-1][B-2][B-3]  Certificates (the "Class [B-1][B-2][B-3]  Certificates") in the
principal amount of $__________.  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  ascribed to it in the Pooling
and  Servicing  Agreement,  dated as of May 26, 1999 (the "Pooling and Servicing
Agreement")  among  Norwest  Asset  Securities   Corporation,   as  seller  (the
"Seller"), Norwest Bank Minnesota, National Association, as master servicer (the
"Master  Servicer"),  First Union  National  Bank, as trust  administrator  (the
"Trust  Administrator")  and the United  States  Trust  Company of New York,  as
trustee  (the  "Trustee")  of  Norwest  Asset  Securities  Corporation  Mortgage
Pass-Through Certificates, Series 1999-17.

          Section  2.  REPRESENTATIONS  AND  WARRANTIES  OF  THE  PURCHASER.  In
connection with the proposed transfer,  the Purchaser represents and warrants to
the Seller, the Master Servicer and the Trust Administrator that:

          Either (i) the  Purchaser  is not an  employee  benefit  plan or other
retirement  arrangement  subject to Title I 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 a  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,  (A) the source of funds used to purchase the
Class [B-1] [B-2] [B-3]  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), (B) 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  and (C) the  purchase  and  holding of such  Class  [B-1][B-2][B-3]
Certificates  are  covered  by  Sections  I and III of PTE  95-60 or  (iii)  the
Purchaser has provided (a) a "Benefit Plan Opinion"  satisfactory  to the Seller
and the Trust  Administrator  of the Trust Estate and (b) such other opinions of
counsel,  officers'  certificates  and  agreements  as the  Seller or the Master
Servicer may have  required.  A Benefit Plan Opinion is an opinion of counsel to
the effect  that the  proposed  transfer  will not cause the assets of the Trust
Estate to be regarded as "plan assets" and subject to the prohibited transaction
provisions  of ERISA,  the Code or Similar  Law and will not  subject  the Trust
Administrator,  the Trustee, the Seller or the Master Servicer to any obligation
in  addition  to  those  undertaken  in  the  Pooling  and  Servicing  Agreement
(including any liability for civil penalties or excise taxes imposed pursuant to
ERISA, Section 4975 of the Code or Similar Law).

<PAGE>

          IN WITNESS  WHEREOF,  the  undersigned has caused this Agreement to be
validly  executed by its duly  authorized  representative  as of the day and the
year first above written.

                                        [PURCHASER]


                                        By:   _____________________________
                                        Its:  _____________________________
                                        [Reserved]

<PAGE>

                                    EXHIBIT L

                              SERVICING AGREEMENTS

                   Norwest Mortgage, Inc. Servicing Agreement

               The Huntington Mortgage Company Servicing Agreement

                 First Union Mortgage Corp. Servicing Agreement

                   Citicorp Mortgage, Inc. Servicing Agreement

                  GMAC Mortgage Corporation Servicing Agreement



<PAGE>

                                    EXHIBIT M

                      [FORM OF SPECIAL SERVICING AGREEMENT]

                 SPECIAL SERVICING AND COLLATERAL FUND AGREEMENT

          This SPECIAL SERVICING AND COLLATERAL FUND AGREEMENT (the "Agreement")
is made and  entered  into as of ,  between  Norwest  Bank  Minnesota,  National
Association (the "Company" and "Norwest Bank") and (the "Purchaser").


                              PRELIMINARY STATEMENT

          _______________  is the holder of the entire interest in Norwest Asset
Securities Corporation Mortgage Pass-Through Certificates, Series 1999-17, Class
_____  (the  "Class B  Certificates").  The  Class B  Certificates  were  issued
pursuant to a Pooling  and  Servicing  Agreement  dated as of May 26, 1999 among
Norwest Asset  Securities  Corporation,  as seller (the "Seller"),  Norwest Bank
Minnesota,  National Association, as Master Servicer, First Union National Bank,
as Trust Administrator, and United States Trust Company of New York, as Trustee.

          ____________________ intends to resell all of the Class B Certificates
directly to the Purchaser on or promptly after the date hereof.

          In connection  with such sale, the parties hereto have agreed that the
Company will cause, to the extent that the Company as Master Servicer is granted
such authority in the related Servicing Agreements,  the related servicers (each
a related "Servicer"), which service the Mortgage Loans which comprise the Trust
Estate  related  to the above  referenced  series  under the  related  servicing
agreements (each a related "Servicing Agreement"),  to engage in certain special
servicing  procedures relating to foreclosures for the benefit of the Purchaser,
and that the  Purchaser  will deposit  funds in a  collateral  fund to cover any
losses  attributable  to such  procedures  as well as all  advances and costs in
connection therewith, as set forth herein.

          In  consideration  of the  mutual  agreements  herein  contained,  the
receipt and  sufficiency of which are hereby  acknowledged,  the Company and the
Purchaser agree that the following  provisions  shall become effective and shall
be binding on and enforceable by the Company and the Purchaser:


                                   ARTICLE I

                                   DEFINITIONS

          Section 1.01 DEFINED TERMS

          Whenever  used in this  Agreement,  the  following  words and phrases,
unless the context otherwise requires, shall have the following meanings:

          BUSINESS  DAY: Any day other than (i) a Saturday or a Sunday or (ii) a
day on which  banking  institutions  in the  State of New York are  required  or
authorized by law or executive order to be closed.

          COLLATERAL  FUND:  The fund  established  and  maintained  pursuant to
Section 3.01 hereof.

          COLLATERAL FUND PERMITTED  INVESTMENTS:  Either (i) obligations of, or
obligations fully guaranteed as to principal and interest by, the United States,
or any agency or instrumentality  thereof,  provided such obligations are backed
by the full faith and  credit of the United  States,  (ii) a money  market  fund
rated in the highest rating  category by a nationally  recognized  rating agency
selected by the Company,  (iii) cash,  (iv) mortgage  pass-through  certificates
issued or guaranteed by Government National Mortgage Association, FNMA or FHLMC,
(v) commercial paper (including both  non-interest-bearing  discount obligations
and interest-bearing  obligations payable on demand or on a specified date), the
issuer of which may be an affiliate  of the Company,  having at the time of such
investment a rating of at least A-1 by Standard  and Poor's  ("S&P") or at least
F-1 by  Fitch  IBCA,  Inc.  ("Fitch")  or (vi)  demand  and  time  deposits  in,
certificates  of deposit of, any depository  institution or trust company (which
may be an affiliate of the  Company)  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 banking authorities,  so long as at the time
of such investment  either (x) the long-term debt obligations of such depository
institution  or trust  company have a rating of at least AA by Fitch or S&P, (y)
the  certificate of deposit or other unsecured  short-term  debt  obligations of
such  depository  institution  or trust company have a rating of at least F-1 by
Fitch or A-1 by S&P or (z) the  depository  institution  or trust company is one
that is acceptable to either Fitch or S&P and, for each of the preceding clauses
(i),  (iv),  (v) and (vi),  the  maturity  thereof  shall be not later  than the
earlier to occur of (A) 30 days from the date of the related  investment and (B)
the next  succeeding  Distribution  Date as defined in the  related  Pooling and
Servicing Agreement.

          COMMENCEMENT OF FORECLOSURE:  The first official action required under
local  law in  order  to  commence  foreclosure  proceedings  or to  schedule  a
trustee's  sale under a deed of trust,  including (i) in the case of a mortgage,
any filing or service of process  necessary to commence an action to  foreclose,
or (ii) in the case of a deed of  trust,  posting,  the  publishing,  filing  or
delivery of a notice of sale, but not including in either case (x) any notice of
default,  notice of intent to foreclose or sell or any other action prerequisite
to  the  actions  specified  in (i) or  (ii)  above,  (y)  the  acceptance  of a
deed-in-lieu  of foreclosure  (whether in connection  with a sale of the related
property or otherwise) or (z) initiation and completion of a short pay-off.

          CURRENT  APPRAISAL:  With respect to any Mortgage Loan as to which the
Purchaser has made an Election to Delay Foreclosure, an appraisal of the related
Mortgaged  Property  obtained  by the  Purchaser  at its  own  expense  from  an
independent  appraiser  (which  shall  not be an  affiliate  of  the  Purchaser)
acceptable to the Company as nearly contemporaneously as practicable to the time
of  the  Purchaser's  election,   prepared  based  on  the  Company's  customary
requirements for such appraisals.

          ELECTION TO DELAY FORECLOSURE:  Any election by the Purchaser to delay
the Commencement of Foreclosure, made in accordance with Section 2.02(b).

          ELECTION TO  FORECLOSE:  Any election by the Purchaser to proceed with
the Commencement of Foreclosure, made in accordance with Section 2.03(a).

          MONTHLY  ADVANCES:  Principal  and  interest  advances  and  servicing
advances including costs and expenses of foreclosure.

          REQUIRED COLLATERAL FUND BALANCE: As of any date of determination,  an
amount equal to the aggregate of all amounts previously required to be deposited
in the Collateral  Fund pursuant to Section  2.02(d)  (after  adjustment for all
withdrawals and deposits pursuant to Section 2.02(e)) and Section 2.03(b) (after
adjustment for all  withdrawals  and deposits  pursuant to Section  2.03(c)) and
Section  3.02 to be reduced by all  withdrawals  therefrom  pursuant  to Section
2.02(g) and  Section  2.03(d).

          Section 1.02 DEFINITIONS INCORPORATED BY REFERENCE

          All  capitalized  terms not otherwise  defined in this Agreement shall
have the meanings assigned in the Pooling and Servicing Agreement.


                                   ARTICLE II

                          SPECIAL SERVICING PROCEDURES

          Section 2.01 REPORTS AND NOTICES

          (a) In connection with the performance of its duties under the Pooling
and Servicing  Agreement  relating to the  realization  upon defaulted  Mortgage
Loans,  the  Company  as Master  Servicer  shall  provide to the  Purchaser  the
following  notices  and  reports:

          (i)  Within  five  Business  Days  after  each  Distribution  Date (or
     included in or with the monthly statements to  Certificateholders  pursuant
     to the Pooling and Servicing Agreement),  the Company, shall provide to the
     Purchaser a report,  using the same  methodology  and  calculations  in its
     standard servicing  reports,  indicating for the Trust Estate the number of
     Mortgage Loans that are (A) thirty days, (B) sixty days, (C) ninety days or
     more  delinquent  or (D) in  foreclosure,  and  indicating  for  each  such
     Mortgage Loan the loan number and outstanding principal balance.

          (ii) Prior to the  Commencement  of Foreclosure in connection with any
     Mortgage  Loan,  the Company shall cause (to the extent that the Company as
     Master  Servicer  is  granted  such  authority  in  the  related  Servicing
     Agreement)  the  Servicer to provide the  Purchaser  with a notice (sent by
     telecopier)  of such  proposed and imminent  foreclosure,  stating the loan
     number and the aggregate  amount owing under the Mortgage Loan. Such notice
     may be provided to the Purchaser in the form of a copy of a referral letter
     from  such  Servicer  to  an  attorney   requesting   the   institution  of
     foreclosure.

          (b) If  requested  by the  Purchaser,  the  Company  shall  cause  the
Servicer  (to the extent  that the Company as Master  Servicer  is granted  such
authority in the related  Servicing  Agreement) to make its servicing  personnel
available  (during  their  normal  business  hours)  to  respond  to  reasonable
inquiries,  by phone or in writing by facsimile,  electronic,  or overnight mail
transmission,  by the Purchaser in connection  with any Mortgage Loan identified
in a report under  subsection (a) (i) (B), (a) (i) (C), (a) (i) (D), or (a) (ii)
which has been given to the Purchaser;  provided,  that (1) the related Servicer
shall only be required to provide  information that is readily accessible to its
servicing personnel and is  non-confidential  and (2) the related Servicer shall
respond   within  five   Business   Days  orally  or  in  writing  by  facsimile
transmission.

          (c) In addition to the foregoing, the Company shall cause the Servicer
(to the extent that the Company as Master  Servicer is granted such authority in
the related Servicing Agreement) to provide to the Purchaser such information as
the Purchaser may reasonably request provided, however, that such information is
consistent with normal reporting  practices,  concerning each Mortgage Loan that
is at least ninety days  delinquent and each Mortgage Loan which has become real
estate owned, through the final liquidation thereof;  provided, that the related
Servicer  shall  only  be  required  to  provide  information  that  is  readily
accessible to its servicing personnel and is non-confidential provided, however,
that the Purchaser will  reimburse the Company and the related  Servicer for any
out of pocket expenses.

          Section 2.02 PURCHASER'S ELECTION TO DELAY FORECLOSURE PROCEEDINGS

          (a) The Purchaser  shall be deemed to direct the Company to direct (to
the extent that the Company as Master  Servicer is granted such authority in the
related  Servicing  Agreement)  the related  Servicer that in the event that the
Company does not receive written notice of the Purchaser's  election pursuant to
subsection (b) below within 24 hours (exclusive of any intervening  non-Business
Days) of  transmission  of the notice provided by the Company under Section 2.01
(a) (ii)  subject to  extension  as set forth in Section  2.02(b),  the  related
Servicer may proceed with the  Commencement  of  Foreclosure  in respect of such
Mortgage Loan in accordance with its normal foreclosure policies without further
notice  to the  Purchaser.  Any  foreclosure  that  has  been  initiated  may be
discontinued  (i) without  notice to the Purchaser if the Mortgage Loan has been
brought  current or if a refinancing  or  prepayment  occurs with respect to the
Mortgage  Loan  (including  by means of a short  payoff  approved by the related
Servicer) or (ii) if the related Servicer has reached the terms of a forbearance
agreement  with the  borrower.  In the latter  case,  the related  Servicer  may
complete such forbearance agreement unless instructed otherwise by the Purchaser
within two Business Days notification.

          (b) In  connection  with any  Mortgage  Loan with  respect  to which a
notice under Section 2.01(a)(ii) has been given to the Purchaser,  the Purchaser
may elect to instruct  the  Company to cause,  to the extent that the Company as
Master  Servicer is granted such authority in the related  Servicing  Agreement,
the related Servicer to delay the Commencement of Foreclosure until such time as
the  Purchaser  determines  that  the  related  Servicer  may  proceed  with the
Commencement of  Foreclosure.  Such election must be evidenced by written notice
received  within 24 hours  (exclusive of any intervening  non-Business  Days) of
transmission  of the notice  provided by the Company under Section  2.01(a)(ii).
Such 24 hour period  shall be extended  for no longer  than an  additional  four
Business Days after the receipt of the  information  if the  Purchaser  requests
additional information related to such foreclosure;  provided, however, that the
Purchaser  will have at least  one  Business  Day to  respond  to any  requested
additional  information.  Any such additional information shall be provided only
to the extent it (i) is not confidential in nature and (ii) is obtainable by the
related  Servicer  from  existing  reports,  certificates  or  statements  or is
otherwise readily  accessible to its servicing  personnel.  The Purchaser agrees
that it has no right to deal with the mortgagor during such period.  However, if
such servicing activities include acceptance of a deed-in-lieu of foreclosure or
short  payoff,  the  Purchaser  will be notified and given two Business  Days to
respond.

          (c) With respect to any Mortgage  Loan as to which the  Purchaser  has
made an Election to Delay  Foreclosure,  the  Purchaser  shall  obtain a Current
Appraisal  as soon as  practicable,  but in no event more than 15 business  days
thereafter, and shall provide the Company with a copy of such Current Appraisal.

          (d)  Within  two  Business  Days  of  making  any  Election  to  Delay
Foreclosure,  the  Purchaser  shall remit by wire  transfer to the Company,  for
deposit in the Collateral Fund, an amount,  as calculated by the Company,  equal
to the sum of (i) 125% of the  greater  of the unpaid  principal  balance of the
Mortgage  Loan and the  value  shown in the  Current  Appraisal  referred  to in
subsection  (c) above (or, if such Current  Appraisal has not yet been obtained,
the Company's  estimate  thereof,  in which case the required deposit under this
subsection  shall be adjusted upon obtaining such Current  Appraisal),  and (ii)
three months' interest on the Mortgage Loan at the applicable  Mortgage Interest
Rate.  If any  Election to Delay  Foreclosure  extends for a period in excess of
three  months  (such  excess  period  being  referred  to herein as the  "Excess
Period"), within two Business Days the Purchaser shall remit by wire transfer in
advance to the  Company for  deposit in the  Collateral  Fund the amount of each
additional month's interest, as calculated by the Company,  equal to interest on
the  Mortgage  Loan at the  applicable  Mortgage  Interest  Rate for the  Excess
Period. The terms of this Agreement will no longer apply to the servicing of any
Mortgage  Loan upon the  failure of the  Purchaser  to deposit  any of the above
amounts  relating to the Mortgage  Loan within two Business Days of the Election
to Delay  Foreclosure  or within two Business  Days of the  commencement  of the
Excess Period subject to Section 3.01.

          (e) With respect to any Mortgage  Loan as to which the  Purchaser  has
made an  Election  to Delay  Foreclosure,  the  Company  may  withdraw  from the
Collateral  Fund from time to time amounts  necessary  to reimburse  the related
Servicer for all related Monthly  Advances and Liquidation  Expenses  thereafter
made by such Servicer in accordance with the Pooling and Servicing Agreement and
the  related  Servicing  Agreement.  To the  extent  that the amount of any such
Liquidation  Expenses is determined by the Company based on estimated costs, and
the actual  costs are  subsequently  determined  to be higher,  the  Company may
withdraw the additional  amount from the Collateral  Fund. In the event that the
Mortgage Loan is brought current by the mortgagor and the foreclosure  action is
discontinued,  the  amounts  so  withdrawn  from the  Collateral  Fund  shall be
redeposited if and to the extent that  reimbursement  therefor from amounts paid
by the  mortgagor  is not  prohibited  pursuant  to the  Pooling  and  Servicing
Agreement  or the related  Servicing  Agreement,  applicable  law or the related
mortgage note. Except as provided in the preceding  sentence,  amounts withdrawn
from the  Collateral  Fund to cover Monthly  Advances and  Liquidation  Expenses
shall not be redeposited  therein or otherwise  reimbursed to the Purchaser.  If
and when any such Mortgage Loan is brought current by the mortgagor, all amounts
remaining  in the  Collateral  Fund in  respect  of such  Mortgage  Loan  (after
adjustment  for  all  permitted   withdrawals  and  deposits  pursuant  to  this
subsection) shall be released to the Purchaser.

          (f) With respect to any Mortgage  Loan as to which the  Purchaser  has
made an Election to Delay  Foreclosure,  the related  Servicer shall continue to
service the Mortgage Loan in accordance  with its  customary  procedures  (other
than the delay in Commencement of Foreclosure as provided  herein).  If and when
the Purchaser  shall notify the Company that it believes that it is  appropriate
to do so, the related Servicer may proceed with the Commencement of Foreclosure.
In any event,  if the Mortgage  Loan is not brought  current by the mortgagor by
the time the loan becomes 6 months delinquent, the Purchaser's election shall no
longer be effective  and at the  Purchaser's  option,  either (i) the  Purchaser
shall  purchase  the Mortgage  Loan from the related  Trust Estate at a purchase
price equal to the fair market  value as shown on the Current  Appraisal,  to be
paid by (x) applying any balance in the Collateral Fund to such to such purchase
price, and (y) to the extent of any deficiency,  by wire transfer of immediately
available  funds from the  Purchaser  to the  Company for deposit in the related
Certificate  Account;  or (ii)  the  related  Servicer  shall  proceed  with the
Commencement of Foreclosure.

          (g) Upon the occurrence of a liquidation  with respect to any Mortgage
Loan as to which the Purchaser made an Election to Delay  Foreclosure  and as to
which the related  Servicer  proceeded with the  Commencement  of Foreclosure in
accordance with subsection (f) above, the Company shall calculate the amount, if
any, by which the value shown on the Current Appraisal obtained under subsection
(c) exceeds the actual sales price obtained for the related  Mortgaged  Property
(net of  Liquidation  Expenses  and  accrued  interest  related to the  extended
foreclosure  period),  and the Company shall  withdraw the amount of such excess
from the  Collateral  Fund,  shall remit the same to the Trust Estate and in its
capacity as Master  Servicer  shall apply such amount as additional  Liquidation
Proceeds  pursuant to the Pooling and  Servicing  Agreement.  After  making such
withdrawal,  all amounts  remaining  in the  Collateral  Fund in respect of such
Mortgage  Loan (after  adjustment  for all  permitted  withdrawals  and deposits
pursuant to this Agreement) shall be released to the Purchaser.

          Section 2.03 PURCHASER'S ELECTION TO COMMENCE FORECLOSURE PROCEEDINGS

          (a) In connection  with any Mortgage Loan identified in a report under
Section 2.01(a)(i)(B), the Purchaser may elect to instruct the Company to cause,
to the extent that the Company as Master  Servicer is granted such  authority in
the  related  Servicing  Agreement,  the related  Servicer  to proceed  with the
Commencement  of  Foreclosure  as soon as  practicable.  Such  election  must be
evidenced by written notice  received by the Company by 5:00 p.m., New York City
time,  on the third  Business  Day  following  the delivery of such report under
Section 2.01(a)(i).

          (b) Within two Business Days of making any Election to Foreclose,  the
Purchaser  shall remit to the Company,  for deposit in the  Collateral  Fund, an
amount,  as  calculated  by the  Company,  equal to 125% of the  current  unpaid
principal balance of the Mortgage Loan and three months interest on the Mortgage
Loan at the  applicable  Mortgage  Interest  Rate. If and when any such Mortgage
Loan is brought current by the mortgagor,  all amounts in the Collateral Fund in
respect of such Mortgage Loan (after  adjustment  for all permitted  withdrawals
and deposits  pursuant to this Agreement)  shall be released to the Purchaser if
and to the extent that reimbursement therefor from amounts paid by the mortgagor
is not prohibited pursuant to the Pooling and Servicing Agreement or the related
Servicing  Agreement,  applicable law or the related mortgage note. The terms of
this  Agreement  will no longer apply to the servicing of any Mortgage Loan upon
the  failure of the  Purchaser  to deposit  the above  amounts  relating  to the
Mortgage Loan within two Business  Days of the Election to Foreclose  subject to
Section 3.01.

          (c) With respect to any Mortgage  Loan as to which the  Purchaser  has
made an Election to Foreclose,  the related  Servicer  shall continue to service
the  Mortgage  Loan in  accordance  with its  customary  procedures  (other than
Commencement of Foreclosure as provided herein).  In connection  therewith,  the
Company shall have the same rights to make  withdrawals for Monthly Advances and
Liquidations  Expenses from the  Collateral  Fund as are provided  under Section
2.02(e), and the Company shall make reimbursements thereto to the limited extent
provided under such subsection in accordance with its customary procedures.  The
Company shall not be required to cause, to the extent that the Company as Master
Servicer is granted  such  authority  in the related  Servicing  Agreement,  the
related Servicer to proceed with the Commencement of Foreclosure if (i) the same
is stayed as a result of the  mortgagor's  bankruptcy or is otherwise  barred by
applicable  law, or to the extent that all legal  conditions  precedent  thereto
have not yet been complied with, or (ii) the Company  believes there is a breach
of representations or warranties by the Company, a Servicer,  or a Seller, which
may result in a repurchase or  substitution  of such Mortgage Loan, or (iii) the
Company or related Servicer  reasonably  believes the Mortgaged  Property may be
contaminated with or affected by hazardous wastes or hazardous  substances (and,
without  limiting  the  related   Servicer's  right  not  to  proceed  with  the
Commencement of Foreclosure, the Company supplies the Purchaser with information
supporting  such  belief).  Any  foreclosure  that  has  been  initiated  may be
discontinued  (x) without  notice to the Purchaser if the Mortgage Loan has been
brought  current or if a refinancing  or  prepayment  occurs with respect to the
Mortgage Loan  (including by means of a short payoff  approved by the Purchaser)
or (y) with  notice to the  Purchaser  if the related  Servicer  has reached the
terms of a forbearance  agreement unless  instructed  otherwise by the Purchaser
within two Business Days of such  notification.  Any such  instruction  shall be
based upon a decision that such forbearance  agreement is not in conformity with
reasonable servicing practices.

          (d) Upon the occurrence of a liquidation  with respect to any Mortgage
Loan as to which the Purchaser made an Election to Foreclose and as to which the
related  Servicer  proceeded with the  Commencement of Foreclosure in accordance
with subsection (c) above,  the Company shall  calculate the amount,  if any, by
which  the  unpaid  principal  balance  of the  Mortgage  Loan  at the  time  of
liquidation  (plus  all  unreimbursed   interest  and  servicing   advances  and
Liquidation  Expenses  in  connection  therewith  other than those paid from the
Collateral  Fund)  exceeds  the actual  sales  price  obtained  for the  related
Mortgaged  Property,  and the Company  shall  withdraw the amount of such excess
from the  Collateral  Fund,  shall remit the same to the Trust Estate and in its
capacity as Master  Servicer  shall apply such amount as additional  Liquidation
Proceeds  pursuant to the Pooling and  Servicing  Agreement.  After  making such
withdrawal,  all amounts  remaining in the Collateral Fund (after adjustment for
all  withdrawals  and  deposits  pursuant to  subsection  (c) in respect of such
Mortgage Loan shall be released to the Purchaser.

          Section 2.04 TERMINATION

          (a) With respect to all Mortgage  Loans  included in the Trust Estate,
the Purchaser's  right to make any Election to Delay Foreclosure or any Election
to Foreclose and the Company's  obligations  under Section 2.01 shall  terminate
(i) at such time as the Principal  Balance of the Class B Certificates  has been
reduced  to  zero,  (ii) if the  greater  of (x) 43% (or such  lower  or  higher
percentage  that  represents  the  related  Servicer's  actual  historical  loss
experience  with respect to the Mortgage Loans in the related pool as determined
by the Company) of the aggregate  principal  balance of all Mortgage  Loans that
are in  foreclosure or are more than 90 days  delinquent on a contractual  basis
and REO  properties  or (y) the  aggregate  amount  that the  Company  estimates
through the normal servicing  practices of the related Servicer will be required
to be withdrawn  from the  Collateral  Fund with respect to Mortgage Loans as to
which the Purchaser has made an Election to Delay  Foreclosure or an Election to
Foreclosure,  exceeds  (z) the  then-current  principal  balance  of the Class B
Certificates,  (iii) upon any transfer by the  Purchaser of any interest  (other
than the minority interest therein,  but only if the transferee provides written
acknowledgment  to the Company of the Purchaser's  right hereunder and that such
transferee will have no rights  hereunder) in the Class B Certificates  (whether
or not such transfer is registered  under the Pooling and Servicing  Agreement),
including any such transfer in connection with a termination of the Trust Estate
or (iv) upon any breach of the terms of this Agreement by the Purchaser.

          (b) Except as set forth in 2.04(a),  this Agreement and the respective
rights,  obligations  and  responsibilities  of the  Purchaser  and the  Company
hereunder shall  terminate upon the later to occur of (i) the final  liquidation
of the last Mortgage  Loan as to which the Purchaser  made any Election to Delay
Foreclosure  or any Election to Foreclose  and the  withdrawal  of all remaining
amounts in the  Collateral  Fund as provided  herein and (ii) ten Business Days'
notice.  The Purchaser's  right to make an election  pursuant to Section 2.02 or
Section 2.03 hereof with respect to a particular  Mortgage Loan shall  terminate
if the Purchaser fails to make any deposit required  pursuant to Section 2.02(d)
or 2.03(b) or if the Purchaser fails to make any other deposit to the Collateral
Fund pursuant to this Agreement.


                                  ARTICLE III

                       COLLATERAL FUND; SECURITY INTEREST

          Section 3.01 COLLATERAL FUND

          Upon receipt from the Purchaser of the initial  amount  required to be
deposited  in the  Collateral  Fund  pursuant to Article  II, the Company  shall
establish and maintain with Bankers Trust Company as a segregated account on its
books and records an account (the  "Collateral  Fund"),  entitled  "Norwest Bank
Minnesota,  National  Association,  as  Master  Servicer,  for  the  benefit  of
registered holders of Norwest Asset Securities Corporation Mortgage Pass-Through
Certificates, Series 1999-17. Amounts held in the Collateral Fund shall continue
to be the  property of the  Purchaser,  subject to the first  priority  security
interest  granted  hereunder  for the benefit of the  Certificateholders,  until
withdrawn from the Collateral Fund pursuant to Section 2.02 or 2.03 hereof.  The
Collateral  Fund shall be an "outside  reserve  fund"  within the meaning of the
REMIC  Provisions,  beneficially  owned by the Purchaser for federal  income tax
purposes.  All income,  gain,  deduction or loss with respect to the  Collateral
Fund shall be that of the Purchaser.  All  distributions  from the Trust Fund to
the  Collateral  Fund shall be treated as  distributed  to the  Purchaser as the
beneficial owner thereof.

          Upon the  termination  of this  Agreement and the  liquidation  of all
Mortgage  Loans as to  which  the  Purchaser  has  made  any  Election  to Delay
Foreclosure  or any Election to Foreclose  pursuant to Section 2.04 hereof,  the
Company shall distribute or cause to be distributed to the Purchaser all amounts
remaining  in the  Collateral  Fund  (after  adjustment  for  all  deposits  and
permitted  withdrawals  pursuant to this Agreement) together with any investment
earnings  thereon.  In the event the  Purchaser  has made any  Election to Delay
Foreclosure  or any  Election to  Foreclose,  prior to any  distribution  to the
Purchaser  of  all  amounts  remaining  in the  Collateral  Fund,  funds  in the
Collateral Fund shall be applied consistent with the terms of this Agreement.

          Section 3.02 COLLATERAL FUND PERMITTED INVESTMENTS.

          The Company shall, at the written  direction of the Purchaser,  invest
the funds in the Collateral Fund in Collateral Fund Permitted Investments.  Such
direction shall not be changed more frequently than quarterly. In the absence of
any direction,  the Company shall select such investments in accordance with the
definition of Collateral Fund Permitted Investments in its discretion.

          All  income  and  gain  realized  from any  investment  as well as any
interest  earned on deposits in the  Collateral  Fund (net of any losses on such
investments)  and any  payments of principal  made in respect of any  Collateral
Fund  Permitted  Investment  shall be  deposited  in the  Collateral  Fund  upon
receipt.  All costs and realized losses associated with the purchase and sale of
Collateral  Fund Permitted  Investments  shall be borne by the Purchaser and the
amount  of net  realized  losses  shall be  deposited  by the  Purchaser  in the
Collateral Fund promptly upon realization.  The Company shall  periodically (but
not more  frequently  than monthly)  distribute to the Purchaser upon request an
amount of cash,  to the extent cash is  available  therefore  in the  Collateral
Fund,  equal to the amount by which the balance of the  Collateral  Fund,  after
giving effect to all other  distributions to be made from the Collateral Fund on
such  date,  exceeds  the  Required  Collateral  Fund  Balance.  Any  amounts so
distributed  shall be  released  from the lien  and  security  interest  of this
Agreement.

          Section 3.03 GRANT OF SECURITY INTEREST

          The  Purchaser  hereby  grants to the  Company  for the benefit of the
Certificateholders under the Pooling and Servicing Agreement a security interest
in and lien on all of the  Purchaser's  right,  title and interest,  whether now
owned or hereafter acquired, in and to: (1) the Collateral Fund, (2) all amounts
deposited in the Collateral  Fund and Collateral  Fund Permitted  Investments in
which such  amounts are  invested  (and the  distributions  and proceeds of such
investments)  and (3) all cash and  non-cash  proceeds of any of the  foregoing,
including  proceeds of the  voluntary  conversion  thereof (all of the foregoing
collectively, the "Collateral").

          The Purchaser  acknowledges  the lien on and the security  interest in
the Collateral for the benefit of the  Certificateholders.  The Purchaser  shall
take all actions  requested  by the Company as may be  reasonably  necessary  to
perfect the security interest created under this Agreement in the Collateral and
cause it to be prior to all other  security  interests and liens,  including the
execution  and  delivery  to the  Company  for filing of  appropriate  financing
statements in accordance with applicable law. The Company shall file appropriate
continuation  statements,  or  appoint  an  agent  on its  behalf  to file  such
statements, in accordance with applicable law.

          Section 3.04 COLLATERAL SHORTFALLS.

          In the event that  amounts on  deposit in the  Collateral  Fund at any
time are  insufficient  to cover any  withdrawals  therefrom that the Company is
then entitled to make  hereunder,  the Purchaser  shall be obligated to pay such
amounts to the Company immediately upon demand. Such obligation shall constitute
a general corporate obligation of the Purchaser. The failure to pay such amounts
within two Business Days of such demand (except for amounts to cover interest on
a Mortgage  Loan  pursuant  to Sections  2.02(d)  and 2.03 (b)),  shall cause an
immediate  termination  of the  Purchaser's  right to make any Election to Delay
Foreclosure  or Election to Foreclose and the Company's  obligations  under this
Agreement  with  respect to all  Mortgage  Loans to which  such  insufficiencies
relate, without the necessity of any further notice or demand on the part of the
Company.


                                   ARTICLE IV

                            MISCELLANEOUS PROVISIONS

          Section 4.01 AMENDMENT.

          This Agreement may be amended from time to time by the Company and the
Purchaser by written agreement signed by the Company and the Purchaser.

          Section 4.02 COUNTERPARTS.

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

          Section 4.03 GOVERNING LAW.

          This Agreement  shall be construed in accordance  with the laws of the
State  of New York and the  obligations,  rights  and  remedies  of the  parties
hereunder shall be determined in accordance with such laws.

          Section 4.04 NOTICES.

          All demands, notices and direction hereunder shall be in writing or by
telecopy and shall be deemed effective upon receipt to:

          (a)  in the case of the Company,

               Norwest Bank Minnesota, National Association
               7485 New Horizon Way
               Frederick, MD  21703

               Attention:  Vice President, Master Servicing
               Phone:  301-696-7800
               Fax:    301-815-6365

          (b)  in the case of the Purchaser,

               ______________________________
               ______________________________
               ______________________________

               Attention:  __________________

          Section 4.05 SEVERABILITY OF PROVISIONS.

          If any one or more of the covenants, agreements, provision or terms of
this Agreement shall be for any reason whatsoever,  including  regulatory,  held
invalid, then such covenants, agreements,  provisions or terms of this Agreement
and  shall  in no way  affect  the  validity  or  enforceability  of  the  other
provisions of this Agreement. Section 4.06 Successors and Assigns.

          The  provisions of this  Agreement  shall be binding upon and inure to
the benefit of the respective  successors and assigns of the parties hereto, and
all such  provisions  shall  inure  to the  benefit  of the  Certificateholders;
provided,  however,  that the rights under this Agreement  cannot be assigned by
the  Purchaser  without the consent of the  Company.  Section  4.07  Article and
Section Headings.

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

          Section 4.08 CONFIDENTIALITY.

          The Purchaser agrees that all information  supplied by or on behalf of
the Company  pursuant to Sections  2.01 or 2.02,  including  individual  account
information,  is the  property of the Company and the  Purchaser  agrees to hold
such information confidential and not to disclose such information.

          Each party hereto  agrees that neither it, nor any officer,  director,
employee,  affiliate or independent  contractor acting at such party's direction
will  disclose  the terms of  Section  4.09 of this  Agreement  to any person or
entity  other  than such  party's  legal  counsel  except  pursuant  to a final,
non-appealable  order of court,  the pendency of such order the other party will
have  received  notice of at least five business days prior to the date thereof,
or pursuant to the other party's prior express written consent.

          Section 4.09 INDEMNIFICATION.

          The Purchaser  agrees to indemnify and hold harmless the Company,  the
Seller, and each Servicer and each person who controls the Company,  the Seller,
or a Servicer and each of their respective officers,  directors,  affiliates and
agents acting at the  Company's,  the Seller's,  or a Servicer's  direction (the
"Indemnified   Parties")  against  any  and  all  losses,   claims,  damages  or
liabilities  to which  they may be  subject,  insofar  as such  losses,  claims,
damages or  liabilities  (or  actions in respect  thereof)  arise out of, or are
based upon, actions taken by, or actions not taken by, the Company,  the Seller,
or a Servicer,  or on their behalf,  in accordance  with the  provisions of this
Agreement and (i) which actions conflict with the Company's,  the Seller's, or a
Servicer's  obligations under the Pooling and Servicing Agreement or the related
Servicing Agreement, or (ii) give rise to securities law liability under federal
or state securities laws with respect to the Certificates.  The Purchaser hereby
agrees to reimburse the  Indemnified  Parties for the reasonable  legal or other
expenses incurred by them in connection with investigating or defending any such
loss, claim, damage, liability or action. The indemnification obligations of the
Purchaser  hereunder  shall  survive  the  termination  or  expiration  of  this
Agreement.

<PAGE>

          IN WITNESS  WHEREOF,  the Company and the Purchaser  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.

                                        Norwest Bank Minnesota, National
                                        Association


                                        By:     ________________________________
                                        Name:   ________________________________
                                        Title:  ________________________________



                                        By:     ________________________________
                                        Name:   ________________________________
                                        Title:  ________________________________

<PAGE>

                                    EXHIBIT N

                                     POLICY



                                   SCHEDULE I

  Norwest Asset Securities Corporation, Mortgage Pass-Through Certificates,
                                 Series 1999-17
               Applicable Unscheduled Principal Receipt Period

                                       FULL UNSCHEDULED   PARTIAL UNSCHEDULED
SERVICER                              PRINCIPAL RECEIPTS   PRINCIPAL RECEIPTS
- --------                              ------------------   ------------------

Norwest Mortgage, Inc.  (Exhibit F-1)      Mid Month           Mid Month
The Huntington Mortgage Company            Mid Month          Prior Month
First Union Mortgage Corp.                 Mid Month          Prior Month
Citicorp Mortgage, Inc.                    Mid Month          Prior Month
GMAC Mortgage Company                      Mid Month          Prior Month




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