NORWEST ASSET SECS CORP MORT PAS THR CERT SER 1997-04 TR
8-K, 1997-10-10
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:  March 27, 1997
(Date of earliest event reported)

Commission File No. 333-21263




                      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>



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

     On March  27,  1997,  Norwest  Asset  Securities  Corporation,  a  Delaware
corporation (the "Registrant"),  sold Mortgage Pass-Through Certificates, Series
1997-4,  Class A-1, Class A-2, Class A-3, Class A-4, Class A-5, Class A-6, Class
A-7, Class A-8, Class A-9, Class A-10, Class A-11, Class A-12, Class A-PO, Class
A-R and Class A-LR (the "Offered  Certificates"),  having an aggregate  original
principal  balance of  $216,014,418.72.  The  Offered  Certificates  were issued
pursuant to a Pooling and Servicing Agreement, dated as of March 27, 1997, among
the Registrant, Norwest Bank Minnesota, National Association, as master servicer
(the "Master Servicer" or "Norwest Bank") and First Union National Bank of North
Carolina as trustee  (the  "Agreement"),  a copy of which is filed as an exhibit
hereto.   Mortgage  Pass-Through   Certificates,   Series  1997-4,  Class  A-WIO
Certificates  having no principal  balance and Class M, Class B-1 and Class B-2,
Class  B-3,  Class B-4 and Class  B-5,  having an  aggregate  initial  principal
balance of  $9,001,822.22  (the "Private  Certificates"  and,  together with the
Class A-WIO Certificate 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  ___.00%  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,
which may  include  loans  secured  by  shares  issued  by  cooperative  housing
corporations.  The  remaining  undivided  interests  in  the  Trust  Estate  are
evidenced by the Private  Certificates,  distributions on which are subordinated
to distributions on the Offered Certificates.

     Interest  on the Offered  Certificates  (other than the Class A-9 and Class
A-PO  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 two  REMICs  for
federal  income tax purposes (the  "Upper-Tier  REMIC" and  "Lower-Tier  REMIC,"
respectively).  The Class A-1, Class A-2, Class A-3, Class A-4, Class A-5, Class
A-6, Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11, Class A-12, Class
A-PO, Class A-WIO, Class M, Class B-1, Class B-2, Class B-3, Class B-4 and Class
B-5 Certificates will be treated as "regular  interests" in the Upper-Tier REMIC
and the Class A-R and Class A-LR  Certificate  will be treated as the  "residual
interests" in the Upper-Tier REMIC and Lower-Tier REMIC, respectively.



<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
                                                     March   27,   1997,   among
                                                     Norwest  Asset   Securities
                                                     Corporation,  Norwest  Bank
                                                     Minnesota,         National
                                                     Association and First Union
                                                     National   Bank  of   North
                                                     Carolina, as trustee.

         (EX-23)                                     Consent    of   Coopers   &
                                                     Lybrand L.L.P., independent
                                                     Certified            Public
                                                     Accountants   of  Financial
                                                     Security Assurance Inc.

<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

March 27, 1997

                                           /s/ B. David Bialzak
                                           --------------------
                                           B. David Bialzak
                                           Vice President




<PAGE>




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



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


   (EX-4)         Pooling and Servicing                          E
                  Agreement, dated as of 
                  March 27, 1997 among Norwest
                  Asset Securities Corporation, 
                  Norwest Bank Minnesota, National 
                  Association and First Union
                  National Bank of North Carolina, 
                  as trustee.

   (EX-23)        Consent of Coopers & Lybrand L.L.P.            E
                  independent Certified Public Accountants
                  of Financial Security Assurance Inc.


                                                                  Execution Copy




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





                      NORWEST ASSET SECURITIES CORPORATION

                                    (Seller)

                                       and

                  NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION

                                (Master Servicer)

                                       and

                   FIRST UNION NATIONAL BANK OF NORTH CAROLINA

                                    (Trustee)

                         POOLING AND SERVICING AGREEMENT


                           Dated as of March 27, 1997

                                 $225,041,300.94

                       Mortgage Pass-Through Certificates
                                  Series 1997-4


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

<PAGE>

          This  Pooling  and  Servicing  Agreement,  dated as of March 27,  1997
executed  by NORWEST  ASSET  SECURITIES  CORPORATION,  as Seller,  NORWEST  BANK
MINNESOTA,  NATIONAL ASSOCIATION,  as Master Servicer,  and FIRST UNION NATIONAL
BANK OF NORTH CAROLINA, as Trustee.


                                WITNESSETH THAT:

          In  consideration  of the  mutual  agreements  herein  contained,  the
Seller, the Master Servicer and the Trustee 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.

          Accretion  Termination  Date: The earlier of (i) the Distribution Date
following the Distribution Date on which the Class A Subclass  Principal Balance
of the Class A-2  Certificates  has been reduced to zero or (ii) the  Cross-Over
Date.

          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 the Class
M Certificates or any Class B Subclass,  the greater of (A) zero and (B) (i) the
principal  balance of such Class or Subclass  with respect to such  Distribution
Date minus (ii) the  Adjustment  Amount for such  Distribution  Date less,  with
respect to the Class M  Certificates,  the Class B  Principal  Balance  or, with
respect to any Class B Subclass, the Class B Subclass Principal Balances for any
Class B Subclasses with higher numerical designations.

          Adjustment  Amount:  For any Distribution Date, the difference between
(A) the sum of the Class A  Principal  Balance,  Class M  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,  Class M 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)(i)  for such  Distribution  Date  without  regard to the provisos in the
definitions of Class M Optimal  Principal  Amount,  Class B-1 Optimal  Principal
Amount,  Class B-2 Optimal Principal Amount, Class B-3 Optimal Principal Amount,
Class B-4 Optimal Principal Amount and Class B-5 Optimal Principal Amount.

          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.

          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
Trustee  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 Trustee 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  or,  following the reduction of the Class B Principal
Balance to zero,  solely to the Class M 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-8
Certificates,  without  giving  effect to the  guaranty  provided  by  Financial
Security) by either Rating  Agency minus (2) the aggregate  amount of Bankruptcy
Losses  allocated solely to the Class B Certificates or, following the reduction
of the Class B Principal  Balance to zero, solely to the Class M 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,  Class A-3 Certificates,  Class A-4  Certificates,  Class A-5
Certificates,   Class  A-6  Certificates,  Class  A-7  Certificates,  Class  A-8
Certificates or Class A-11 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, Class M 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 Trustee.

          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 (i)
variations in the Percentage  Interest evidenced thereby and (ii) in the case of
the  Class A  Certificates  and Class B  Certificates,  variations  in  Subclass
designation and other Subclass characteristics.

          Class A  Certificate:  Any one of Class  A-1  Certificates,  Class A-2
Certificates,   Class  A-3  Certificates,  Class  A-4  Certificates,  Class  A-5
Certificates,   Class  A-6  Certificates,  Class  A-7  Certificates,  Class  A-8
Certificates,   Class  A-9  Certificate,  Class  A-10  Certificate,  Class  A-11
Certificates,  Class A-12  Certificates,  Class A-PO  Certificates,  Class A-WIO
Certificates, Class A-R Certificate or Class A-LR Certificate.

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

          Class  A  Distribution  Amount:  As  to  any  Distribution  Date,  the
aggregate  amount  distributable  to the Subclasses of Class A Certificates  and
Financial  Security  pursuant to Paragraphs first,  second,  third and fourth of
Section 4.01(a)(i) 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  Class  A  Subclass  Interest  Accrual  Amounts  with  respect  to  such
Distribution Date.

          Class A Loss  Denominator:  As to any  Determination  Date,  an amount
equal to the sum of (i) the Class A Subclass  Principal  Balances of the Class A
Certificates (other than the Class A-3 and Class A-PO Certificates) and (ii) the
lesser of the Class A Subclass  Principal  Balance of the Class A-3 Certificates
and  the  Original  Class  A  Subclass   Principal  Balance  of  the  Class  A-3
Certificates.

          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
Premium  Payment,  (iii)  the  sum of  the  Class  A  Subclass  Unpaid  Interest
Shortfalls for each Class A Subclass, (iv) the Premium Unpaid Shortfalls 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  Servicer,  the  Master  Servicer  or the
     Trustee in respect of such defective Mortgage Loan.

          Class A Non-PO  Principal  Amount:  As to any  Distribution  Date, the
aggregate  amount  distributed in respect of the Class A Subclasses  pursuant to
Paragraph third clause (A) of Section 4.01(a)(i).

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

          Class A Non-PO Principal  Distribution  Amount: As to any Distribution
Date,  the sum of (i) the Class A-3 Accrual  Distribution  Amount,  if any, with
respect to such  Distribution  Date and (ii) the Class A Non-PO Principal Amount
with respect to such Distribution Date.

          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 March 2002, 100%. As to any Distribution Date
subsequent to March 2002 to and including the  Distribution  Date in March 2003,
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 March 2003 to and including the Distribution  Date in March 2004, 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 March
2004  to and  including  the  Distribution  Date  in  March  2005,  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 March
2005  to and  including  the  Distribution  Date  in  March  2006,  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 March
2006,  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 March 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 M Principal  Balance
and the current Class B Principal  Balance and (b)  cumulative  Realized  Losses
shall not exceed (1) 30% of the Original Subordinated  Principal Balance if such
Distribution  Date occurs  between and including  April 2002 and March 2003, (2)
35% of the Original  Subordinated  Principal  Balance if such  Distribution Date
occurs between and including  April 2003 and March 2004, (3) 40% of the Original
Subordinated  Principal  Balance if such  Distribution  Date occurs  between and
including  April  2004 and  March  2005,  (4) 45% of the  Original  Subordinated
Principal  Balance if such  Distribution Date occurs between and including April
2005 and March 2006, and (5) 50% of the Original Subordinated  Principal Balance
if such Distribution Date occurs during or after April 2006. 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 Trustee,  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 Class A Subclass Principal Balances for the Class A-1 Certificates, Class
A-2  Certificates,  Class A-3 Certificates,  Class A-4  Certificates,  Class A-5
Certificates,   Class  A-6  Certificates,  Class  A-7  Certificates,  Class  A-8
Certificates,  Class  A-9  Certificate,  Class  A-11  Certificates,  Class  A-12
Certificates,  Class A-PO  Certificates,  Class A-R  Certificate  and Class A-LR
Certificate.

          Class A  Subclass:  Any of the  Subclasses  of  Class  A  Certificates
consisting  of the Class A-1  Certificates,  Class A-2  Certificates,  Class A-3
Certificates,   Class  A-4  Certificates,  Class  A-5  Certificates,  Class  A-6
Certificates,   Class  A-7  Certificates,  Class  A-8  Certificates,  Class  A-9
Certificate,  Class  A-10  Certificate,  Class  A-11  Certificates,  Class  A-12
Certificates,  Class A-PO  Certificates,  Class  A-WIO  Certificates,  Class A-R
Certificate and Class A-LR Certificate.

          Class A Subclass  Distribution Amount: As to any Distribution Date and
any  Class A  Subclass  (other  than the  Class A-3  Certificates),  the  amount
distributable  to such Class A Subclass  pursuant to Paragraphs  first,  second,
third and fourth of Section 4.01(a)(i). As to the Class A-3 Certificates, (a) as
to any  Distribution  Date prior to the Accretion  Termination  Date, the amount
distributable to the Class A-3  Certificates  pursuant to Paragraph third clause
(A) of Section 4.01(a)(i) and any amounts distributable pursuant to the provisos
in  Paragraphs  first  and  second  of  Section  4.01  (a)(i)  and (b) as to any
Distribution  Date on or  after  the  Accretion  Termination  Date,  the  amount
distributable to the Class A-3 Certificates pursuant to Paragraphs first, second
and third clause (A) of Section 4.01(a)(i).

          Class A Subclass  Interest Accrual Amount: As to any Distribution Date
and any Class A Subclass (other than the Class A-9, Class A-10,  Class A-WIO and
Class A-PO Certificates),  (i) the product of (a) 1/12th of the Class A Subclass
Pass-Through  Rate  for  such  Class A  Subclass  and (b) the  Class A  Subclass
Principal  Balance  of  such  Class  A  Subclass  as of the  Determination  Date
preceding  such  Distribution  Date  minus  (ii) the Class A  Subclass  Interest
Percentage of such Class A Subclass of (x) any Non-Supported  Interest Shortfall
allocated to the Class A Certificates  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). As to any Distribution Date and the
Class A-10  Certificates,  the Class A-10  Interest  Accrual  Amount.  As to any
Distribution  Date and the Class A-WIO  Certificates,  the Class A-WIO  Interest
Accrual Amount.  The Class A-9 Certificate and Class A-PO  Certificates  have no
Class A Subclass Interest Accrual Amount.

          Class A Subclass Interest Percentage:  As to any Distribution Date and
any Class A Subclass (other than the Class A-9 and Class A-PO Certificates), the
percentage  calculated by dividing the Class A Subclass  Interest Accrual Amount
of such  Class A  Subclass  (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 Class A
Subclass  Interest  Accrual  Amount)  and (b) the  Premium  Payment  (determined
without regard to clause (ii) of the definition of Premium Payment).

          Class A Subclass  Interest  Shortfall  Amount:  As to any Distribution
Date and any  Subclass  of Class A  Certificates  (other  than the Class A-9 and
Class A-PO  Certificates),  any  amount by which the Class A  Subclass  Interest
Accrual Amount of such Class A Subclass with respect to such  Distribution  Date
exceeds  the amount  distributed  in  respect  of such Class A Subclass  on such
Distribution Date pursuant to Paragraph first of Section  4.01(a)(i)  (including
in the case of the Class A-3  Certificates  prior to the  Accretion  Termination
Date, the amount included in the Class A-3 Accrual  Distribution Amount pursuant
to clause (i) of the definition thereof).

          Class A Subclass Loss Percentage: As to any Determination Date and any
Subclass of Class A Certificates  (other than the Class A-3,  Class A-10,  Class
A-WIO and Class A-PO Certificates) then outstanding,  the percentage  calculated
by dividing the Class A Subclass Principal Balance of such Subclass by the Class
A Loss  Denominator  (determined  without  regard to any such  Class A  Subclass
Principal  Balance of any Class A Subclass not then  outstanding),  in each case
determined  as of  the  preceding  Determination  Date.  As  to  the  Class  A-3
Certificates and any Determination Date, the Class A-3 Loss Percentage.

          Class A Subclass Pass-Through Rate: As to each Class A Subclass, other
than  the  Class  A-1,  Class  A-9,  Class  A-10,  Class  A-PO and  Class  A-WIO
Certificates,  the  Class  A  Fixed  Pass-Through  Rate.  As to  the  Class  A-1
Certificates,  7.25% per  annum.  As to the Class  A-10  Certificate,  0.25% per
annum. As to the Class A-WIO Certificate, the Class A-WIO Pass-Through Rate. The
Class A-9 Certificate and Class A-PO  Certificates  are not entitled to interest
and have no Class A Subclass Pass-Through Rate.

          Class A Subclass Principal Balance: As of the first Determination Date
and as to any  Class A  Subclass  (other  than the Class  A-10 and  Class  A-WIO
Certificates),  the Original Class A Subclass  Principal Balance of such Class A
Subclass.  As of any subsequent  Determination Date prior to the Cross-Over Date
and as to any Class A Subclass (other than the Class A-10,  Class A-PO and Class
A-WIO  Certificates),  the Original Class A Subclass  Principal  Balance of such
Class A Subclass  (increased  in the case of the Class A-3  Certificates  by the
Class A-3 Principal  Accretion Amount with respect to prior Distribution  Dates)
less the sum of (a) all amounts previously  distributed in respect of such Class
A Subclass on prior  Distribution  Dates (A) pursuant to Paragraph  third clause
(A) of Section  4.01(a)(i),  (B) as a result of a Principal  Adjustment  and (C)
from the Class A-3  Accrual  Distribution  Amounts  for such prior  Distribution
Dates and (b) the Realized Losses allocated through such  Determination  Date to
such Class A Subclass  pursuant to Section  4.02(b).  After the Cross-Over Date,
each such  Class A  Subclass  Principal  Balance  will also be  reduced  on each
Determination  Date by an amount  equal to the  product  of the Class A Subclass
Loss  Percentage  of such Class A Subclass  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; provided,  however, that the amount of any
such  reduction  for the Class A-11  Certificates  will be reduced by Class A-12
Loss  Allocation  Amount.  After  the  Cross-Over  Date,  the  Class A  Subclass
Principal  Balance for the Class A-12  Certificates will additionally be reduced
by the Class  A-12  Loss  Allocation  Amount.  The  Class  A-10 and Class  A-WIO
Certificates will not have Class A Subclass Principal Balances.

          As of any subsequent  Determination  Date prior to the Cross-Over Date
and as to the Class A-PO  Certificates,  the Original Class A Subclass Principal
Balance  of such  Class A Subclass  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)(i)
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  Class  A  Subclass   Principal  Balance  will  also  be  reduced  on  each
Determination  Date by an amount equal to the difference,  if any,  between such
Class A Subclass  Principal Balance as of such Determination Date without regard
to this  sentence  and the Adjusted  Pool Amount (PO Portion) for the  preceding
Distribution Date.

          Class A Subclass Unpaid  Interest  Shortfall:  As to any  Distribution
Date and Class A Subclass,  the amount,  if any, by which the  aggregate  of the
Class A Subclass Interest  Shortfall Amounts for such Class A Subclass for prior
Distribution  Dates is in excess of the amounts  distributed  in respect of such
Class A Subclass  (or,  in the case of the Class A-3  Certificates  prior to the
Accretion  Termination  Date,  the  amount  included  in the Class  A-3  Accrual
Distribution  Amount pursuant to clause (ii) of the definition thereof) on prior
Distribution Dates pursuant to Paragraph second of Section 4.01(a)(i).

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

          Class A Voting  Interest:  The sum of (A) the  product of (i) the then
applicable  Class A Percentage  and (ii) the Non-PO Voting  Interest and (B) the
Pool Balance (PO Portion)  divided by the Pool Balance (Non-PO  Portion) and the
Pool Balance (PO Portion).

          Class A-1  Certificate:  Any one of the  Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit A-1 and Exhibit D 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
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit A-2 and Exhibit D hereto.

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

          Class A-3 Accrual  Distribution  Amount:  As to any Distribution  Date
prior to the Accretion  Termination  Date, an amount equal to the sum of (i) the
Class A  Subclass  Interest  Percentage  of the  Class A-3  Certificates  of the
Current  Class A  Interest  Distribution  Amount  and (ii) the Class A  Subclass
Interest  Shortfall  Percentage  of the Class  A-3  Certificates  of the  amount
distributed in respect of the Class A Subclasses pursuant to Paragraph second of
Section  4.01(a)(i) on such Distribution Date. As to any Distribution Date on or
after the Accretion Termination Date, zero.

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

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

          Class  A-3  Loss  Percentage:   As  to  any  Determination  Date,  the
percentage  calculated  by  dividing  (i) the  lesser  of the  Class A  Subclass
Principal  Balance  of the  Class  A-3  Certificates  and the  Original  Class A
Subclass  Principal  Balance of the Class A-3  Certificates  by (ii) the Class A
Loss Denominator  (determined  without regard to any Class A Subclass  Principal
Balance not then outstanding) determined as of the preceding Determination Date.

          Class A-3 Principal  Accretion  Amount:  As to any  Distribution  Date
prior to the  Accretion  Termination  Date,  an  amount  equal to the sum of the
amounts  calculated  pursuant to clauses (i) and (ii) of the definition of Class
A-3 Accrual  Distribution  Amount with respect to such Distribution  Date. As to
any Distribution Date on or after the Accretion Termination Date, zero.

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

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

          Class A-5  Certificate:  Any one of the  Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit A-5 and Exhibit D hereto.

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

          Class A-6  Certificate:  Any one of the  Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit A-6 and Exhibit D hereto.

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

          Class A-7  Certificate:  Any one of the  Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit A-7 and Exhibit D hereto.

          Class  A-7  Certificateholder:  The  registered  holder of a Class A-7
Certificate.

          Class A-8 Certificate: Any one of the Certificates executed by
the Trustee and  authenticated  by the  Trustee or the  Authenticating  Agent in
substantially the form set forth in Exhibit A-8 and Exhibit D hereto.

          Class  A-8  Certificateholder:  The  registered  holder of a Class A-8
Certificate.

          Class  A-8  Distribution  Deficiency:  With  respect  to the Class A-8
Certificates  on each  Distribution  Date, the sum of (i) the Class A-8 Interest
Loss Amount for such  Distribution  Date and (ii) the Class A-8  Principal  Loss
Amount for such Distribution Date.

          Class A-8  Interest  Loss Amount:  As to any  Distribution  Date,  the
excess, if any, of (i) the Class A Subclass Interest Accrual Amount of the Class
A-8  Certificates  (determined  without  regard to clause (ii) of the definition
thereof),  net of any Non-Supported  Interest Shortfalls  allocated to the Class
A-8  Certificates  that are  covered  by the  Reserve  Fund over (ii) the amount
available to be  distributed  in respect of the Class A-8  Certificates  on such
Distribution Date pursuant to Paragraph first of Section 4.01(a)(i).

          Class A-8 Principal Loss Amount: As to any Distribution  Date, the sum
of, without  duplication,  (i) the Class A Subclass Loss Percentage of the Class
A-8  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-8  Certificates  after the  Cross-Over  Date with respect to such
Distribution  Date pursuant to the third  sentence in the  definition of Class A
Subclass Principal Balance.

          Class A-9  Certificate:  The  Certificate  executed by the Trustee and
authenticated by the Trustee or the  Authenticating  Agent in substantially  the
form set forth in Exhibit A-9 and Exhibit D hereto.

          Class A-9  Certificateholder:  The registered  holder of the Class A-9
Certificate.

          Class A-10  Certificate:  The Certificate  executed by the Trustee and
authenticated by the Trustee or the  Authenticating  Agent in substantially  the
form set forth in Exhibit A-10 and Exhibit D hereto.

          Class A-10 Certificateholder:  The registered holder of the Class A-10
Certificate.

          Class A-10 Interest Accrual Amount:  As to any Distribution  Date, (i)
the  product  of (A) 1/12th of the Class A  Subclass  Pass-Through  Rate for the
Class  A-10  Certificate  and (B)  the  Class  A-10  Notional  Amount  as of the
Determination  Date  preceding  such  Distribution  Date  minus (ii) the Class A
Subclass  Interest   Percentage  of  the  Class  A-10  Certificate  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).

          Class A-10 Notional  Amount:  As to any  Distribution  Date, an amount
equal to the Class A Subclass Principal Balance of the Class A-1 Certificates.

          Class A-11 and Class A-12 Percentage:  The sum of the Class A Subclass
Principal  Balances of the Class A-11 and A-12 Certificates  divided by the Pool
Balance (Non-PO Portion).

          Class  A-11  and  Class  A-12  Prepayment  Shift  Percentage:  For any
Distribution Date will be the percentage indicated below:

Distribution Date Occurring In                        Class A-11 and Class A-12 
                                                     Prepayment Shift Percentage

April 1997 through March 2002..................                   0%
April 2002 through March 2003..................                  30%
April 2003 through March 2004..................                  40%
April 2004 through March 2005..................                  60%
April 2005 through March 2006..................                  80%
April 2006 and thereafter......................                 100%

          Class A-11 and Class A-12 Priority Amount:  For any Distribution Date,
the  lesser of (i) the sum of the Class A  Subclass  Principal  Balances  of the
Class A-11 and Class A-12  Certificates  and (ii) the sum of (A) the  product of
(1) the Class A-11 and Class A-12 Percentage,  (2) the Class A-11 and Class A-12
Shift  Percentage and (3) the Scheduled  Principal Amount and (B) the product of
(1) the Class A-11 and Class A-12 Percentage,  (2) the Class A-11 and Class A-12
Prepayment Shift Percentage, and (3) the Unscheduled Principal Amount.

          Class A-11 and Class A-12 Shift Percentage:  For any Distribution Date
will be the percentage indicated below:

Distribution Date Occurring In                         Class A-11 and Class A-12
                                                           Shift Percentage

April 1997 through March 2002..................                    0%
April 2002 and thereafter......................                  100%

          Class A-11  Certificate:  Any one of the Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit A-11 and Exhibit D hereto.

          Class A-11  Certificateholder:  The registered  holder of a Class A-11
Certificate.

          Class A-11 Loss Amount:  With respect to any Determination  Date after
the Cross-Over Date, the amount, if any, by which the Class A Subclass Principal
Balance  of the Class  A-11  Certificates  would be  reduced  as a result of the
application  of the  third  sentence  of the  definition  of  Class  A  Subclass
Principal Balance without regard to the proviso set forth in such sentence.

          Class A-12  Certificate:  Any one of the Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit A-12 and Exhibit D hereto.

          Class A-12  Certificateholder:  The registered  holder of a Class A-12
Certificate.

          Class A-12 Loss Allocation  Amount:  With respect to any Determination
Date after the Cross-Over Date the lesser of (a) the Class A Subclass  Principal
Balance of the Class A-12 Certificates with respect to such  Determination  Date
prior to any  reduction  for the Class A-12 Loss  Allocation  Amount and (b) the
Class A-11 Loss Amount.

          Class AIO-L Interest: A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

          Class A-L1 Interest:  A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

          Class A-L2 Interest:  A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

          Class A-L8 Interest:  A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

          Class A-L9 Interest:  A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

          Class A-LR  Certificate:  The Certificate  executed by the Trustee and
authenticated by the Trustee or the  Authenticating  Agent in substantially  the
form set forth in Exhibit A-LR and Exhibit D hereto.

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

          Class A-LUR Interest: A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

          Class A-PO  Certificate:  Any one of the Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit A-PO and Exhibit D 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)(i) 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)(i).  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  Distribution  Amount: As to any  Distribution  Date,  the
aggregate  amount  distributable  to the Class  A-PO  Certificates  pursuant  to
Paragraphs   third  clause  (B)  and  fourth  of  Section   4.01(a)(i)  on  such
Distribution Date.

          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  Servicer,  the  Master  Servicer  or the  Trustee  in  respect of such
     defective Mortgage Loan.

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

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

          Class A-WIO Certificate:  Any one of the Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit A-WIO and Exhibit D hereto.

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

          Class A-WIO Interest Accrual Amount: As to any Distribution  Date, (i)
the product of (a) 1/12th of the Class A-WIO Pass-Through Rate and (b) the Class
A-WIO Notional Amount as of the  Determination  Date preceding such Distribution
Date minus  (ii) the Class A Subclass  Interest  Percentage  of the Class  A-WIO
Certificates 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).

          Class  A-WIO  Notional  Amount:  As  to  any  Distribution  Date,  the
aggregate  Scheduled  Principal Balance of the Premium Mortgage Loans as of such
Distribution Date.

          Class A-WIO  Pass-Through  Rate:  As to any  Distribution  Date, a per
annum rate equal to the  Weighted  Average  Net  Mortgage  Interest  Rate of the
Premium Mortgage Loans minus 7.50%

          Class AP-L Interest:  A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

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

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

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

          Class B  Pass-Through  Rate: As to any  Distribution  Date,  7.50% per
annum.

          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 and Class B-5 Principal Balance.

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

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

          Class B Subclass  Interest Accrual Amount: As to any Distribution Date
and any Class B  Subclass,  an amount  equal to (i) the product of 1/12th of the
Class B  Pass-Through  Rate and the Class B Subclass  Principal  Balance of such
Class B Subclass as of the  Determination  Date preceding such Distribution Date
minus (ii) the Class B Subclass Interest  Percentage of such Class B Subclass 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).

          Class B Subclass Interest Percentage:  As to any Distribution Date and
any Class B Subclass, the percentage calculated by dividing the Class B Subclass
Interest Accrual Amount of such Class B Subclass  (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 Class B
Subclass Interest Accrual Amount).

          Class B  Subclass  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 or Class B-5
Interest Shortfall Amount.

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

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

          Class  B  Subclass  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 or Class B-5 Prepayment Percentage.

          Class B Subclass  Principal  Balance:  Any of the Class B-1  Principal
Balance,  Class B-2 Principal Balance,  Class B-3 Principal  Balance,  Class B-4
Principal Balance or Class B-5 Principal Balance.

          Class B  Subclass  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  or Class B-5 Unpaid
Interest Shortfall.

          Class B-1  Certificate:  Any one of the  Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit B-1 and Exhibit D 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 eighth, ninth and tenth of Section 4.01(a)(i).

          Class B-1 Interest  Shortfall Amount: As to any Distribution Date, any
amount by which the Class B Subclass  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 eighth of Section 4.01(a)(i).

          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  Servicer,  the  Master  Servicer  or the
     Trustee in respect of such defective Mortgage Loan;

provided,  however,  that if an Optimal  Adjustment Event occurs with respect to
such Subclass 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, 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-1 Principal Balance  (determined as of the  Determination  Date preceding such
Distribution  Date)  and the  denominator  of  which  is the sum of the  Class M
Principal  Balance  and the Class B Subclass  Principal  Balances of the Class B
Subclasses  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-1  Certificates  are not
eligible to receive  distributions  of  principal  in  accordance  with  Section
4.01(d)(i), the Class B-1 Percentage for such Distribution Date will be zero.

          Class B-1 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-1 Principal  Balance  (determined  as of the  Determination
Date preceding such  Distribution  Date) and the denominator of which is the sum
of the Class M Principal Balance and the Class B Subclass  Principal Balances of
the Class B  Subclasses  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-1
Certificates  are  not  eligible  to  receive   distributions  of  principal  in
accordance with Section 4.01(d)(i), the Class B-1 Prepayment Percentage for such
Distribution Date will be zero.

          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 tenth of Section 4.01(a)(i)
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 sum of the Class A Principal Balance and the Class M
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 ninth of Section 4.01(a)(i).

          Class B-2  Certificate:  Any one of the  Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit B-2 and Exhibit D 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 eleventh, twelfth and thirteenth of Section 4.01(a)(i).

          Class B-2 Interest  Shortfall Amount: As to any Distribution Date, any
amount by which the Class B Subclass  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 eleventh of Section 4.01(a)(i).

          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  Servicer,  the  Master  Servicer  or the
     Trustee in respect of such defective Mortgage Loan;

provided,  however,  that if an Optimal  Adjustment Event occurs with respect to
such Subclass 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  Class M
Principal  Balance  and the Class B Subclass  Principal  Balances of the Class B
Subclasses  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 Class M Principal Balance and the Class B Subclass  Principal Balances of
the Class B  Subclasses  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  thirteenth  of  Section
4.01(a)(i)  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,  the
Class M  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 twelfth of Section 4.01(a)(i).

          Class B-3  Certificate:  Any one of the  Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit B-3 and Exhibit D 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 fourteenth, fifteenth and sixteenth of Section 4.01(a)(i).

          Class B-3 Interest  Shortfall Amount: As to any Distribution Date, any
amount by which the Class B Subclass  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 fourteenth of Section 4.01(a)(i).

          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  Servicer,  the  Master  Servicer  or the
     Trustee in respect of such defective Mortgage Loan;

provided,  however,  that if an Optimal  Adjustment Event occurs with respect to
such Subclass 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  Class M
Principal  Balance  and the Class B Subclass  Principal  Balances of the Class B
Subclasses  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 Class M Principal Balance and the Class B Subclass  Principal Balances of
the Class B  Subclasses  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  sixteenth  of  Section
4.01(a)(i)  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 M 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 fifteenth of Section 4.01(a)(i).

          Class B-4  Certificate:  Any one of the  Certificates  executed by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit B-4 and Exhibit D 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 seventeenth, eighteenth, and nineteenth of Section 4.01(a)(i).

          Class B-4 Interest  Shortfall Amount: As to any Distribution Date, any
amount by which the Class B Subclass  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 seventeenth of Section 4.01(a)(i).

          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  Servicer,  the  Master  Servicer  or the
     Trustee in respect of such defective Mortgage Loan;

provided,  however,  that if an Optimal  Adjustment Event occurs with respect to
such Subclass 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  Class M
Principal  Balance  and the Class B Subclass  Principal  Balances of the Class B
Subclasses  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 Class M Principal Balance and the Class B Subclass  Principal Balances of
the Class B  Subclasses  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  nineteenth  of  Section
4.01(a)(i)  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 M  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 eighteenth of Section 4.01(a)(i).

          Class B-5 Certificate: Any of the Certificates executed by the Trustee
and  authenticated by the Trustee or the  Authenticating  Agent in substantially
the form set forth in Exhibit B-5 and Exhibit D 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 twentieth, twenty-first, and twenty-second of Section 4.01(a)(i).

          Class B-5 Interest  Shortfall Amount: As to any Distribution Date, any
amount by which the Class B Subclass  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 twentieth of Section 4.01(a)(i).

          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  Servicer,  the  Master  Servicer  or the
     Trustee in respect of such defective Mortgage Loan;

provided,  however,  that if an Optimal  Adjustment Event occurs with respect to
such Subclass 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  Class M
Principal  Balance  and the Class B Subclass  Principal  Balances of the Class B
Subclasses  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 Class M Principal Balance and the Class B Subclass  Principal Balances of
the Class B  Subclasses  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  pursuant  to  Paragraph   twenty-second  of  Section
4.01(a)(i) 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 M  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 twenty-first of Section 4.01(a)(i).

          Class B-L1 Interest:  A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

          Class B-L2 Interest:  A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

          Class B-L3 Interest:  A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

          Class B-L4 Interest:  A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

          Class B-L5 Interest:  A regular interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii) hereof.

          Class M  Certificate:  Any  one of the  Certificates  executed  by the
Trustee  and  authenticated  by the  Trustee  or  the  Authenticating  Agent  in
substantially the form set forth in Exhibit C and Exhibit D hereto.

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

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

          Class M Interest  Accrual  Amount:  As to any  Distribution  Date,  an
amount equal to (i) the product of 1/12th of the Class M  Pass-Through  Rate and
the Class M  Principal  Balance  as of the  Determination  Date  preceding  such
Distribution Date minus (ii) (x) any Non-Supported  Interest Shortfall allocated
to the Class M 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 M Certificates with respect to
such Distribution Date pursuant to Section 4.02(e).

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

          Class M 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 M 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 M 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 M 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 M  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  Servicer,  the  Master  Servicer  or the
     Trustee 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 M Optimal Principal Amount will
equal  the  lesser of (A) the Class M Optimal  Principal  Amount  calculated  as
described in the preceding provisions and (B) the Adjusted Principal Balance for
the Class M Certificates.

          Class M  Pass-Through  Rate: As to any  Distribution  Date,  7.50% per
annum.

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

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

          Class M Principal  Balance:  As to the first  Determination  Date, the
Original Class M Principal Balance. As of any subsequent Determination Date, the
lesser of (i) the  Original  Class M Principal  Balance  less the sum of (a) all
amounts  previously  distributed in respect of the Class M Certificates on prior
Distribution  Dates (A) pursuant to Paragraph seventh of Section  4.01(a)(i) and
(B) as a result of a Principal  Adjustment and (b) the Realized Losses allocated
through such Determination Date to the Class M 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 M Unpaid Interest  Shortfall:  As to any Distribution  Date, the
amount, if any, by which the aggregate of the Class M Interest Shortfall Amounts
for prior Distribution Dates is in excess of the amounts  distributed in respect
of the Class M Certificates  on prior  Distribution  Dates pursuant to Paragraph
sixth of Section 4.01(a)(i).

          Class M-L Interest:  A regular  interest in the Lower-Tier REMIC which
is  held  as an  asset  of the  Upper-Tier  REMIC  and is  entitled  to  monthly
distributions as provided in Section 4.01(a)(ii).

          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 11.23.

          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 Trustee,  at which
at any particular time its corporate trust business shall be administered, which
office is located at 230 South Tryon Street, Charlotte, North Carolina 28288.

          Corresponding  Upper-Tier  Class : As to the following  Uncertificated
Lower-Tier Interests, the Corresponding Upper-Tier Class or Classes, as follows:

Uncertificated Lower-Tier Interest          Corresponding Upper-Tier Class

     Class A-L1 Interest                    Class A-1 Certificates and
                                            Class A-10 Certificate

     Class A-L2 Interest                    Class A-2 Certificates,
                                            Class A-3 Certificates,
                                            Class A-4 Certificates,
                                            Class A-5 Certificates,
                                            Class A-6 Certificates,
                                            Class A-7 Certificates,
                                            Class A-11 Certificates and
                                            Class A-12 Certificates

     Class A-L8 Interest                    Class A-8 Certificates

     Class A-L9 Interest                    Class A-9 Certificate

     Class AP-L Interest                    Class A-PO Certificates

     Class AIO-L Interest                   Class A-WIO Certificates

     Class A-LUR Interest                   Class A-R Certificate

     Class M-L Interest                     Class M Certificates

     Class B-L1 Interest                    Class B-1 Certificates

     Class B-L2 Interest                    Class B-2 Certificates

     Class B-L3 Interest                    Class B-3 Certificates

     Class B-L4 Interest                    Class B-4 Certificates

     Class B-L5 Interest                    Class B-5 Certificates

          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 Class A  Subclasses  and the
Premium  Payment  pursuant  to  Paragraph  first of Section  4.01(a)(i)  on such
Distribution Date.

          Current Class B Interest  Distribution  Amount: As to any Distribution
Date, the amount distributed in respect of the Class B Certificates  pursuant to
Paragraphs eighth,  eleventh,  fourteenth,  seventeenth and twentieth of Section
4.01(a)(i) 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 Class B Subclass  Principal Balances of the Class B-2, Class B-3,
Class B-4 and Class B-5  Certificates by the sum of the Class A Non-PO Principal
Balance,  the Class M 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 Class B Subclass  Principal  Balances of the Class B-3, Class B-4
and Class B-5 Certificates by the sum of the Class A Non-PO  Principal  Balance,
the Class M 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 Class B Subclass  Principal  Balances  of the Class B-4 and Class
B-5 Certificates by the sum of the Class A Non-PO Principal Balance, the Class M
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 Class B Subclass  Principal Balance of the Class B-5 Certificates by the sum
of the Class A Non-PO Principal  Balance,  the Class M Principal Balance and the
Class B Principal Balance. As to the first Distribution Date, the Original Class
B-4 Fractional Interest.

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

          Current Class M Interest  Distribution  Amount: As to any Distribution
Date, the amount distributed in respect of the Class M Certificates  pursuant to
Paragraph fifth of Section 4.01(a)(i) on such Distribution Date.

          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 Trustee,  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 Trustee, and thereafter the Custodian,  if
any,  hereafter  appointed  by the  Trustee  pursuant  to Section  8.13,  or its
successor in interest under the Custodial Agreement. The Custodian may (but need
not)  be the  Trustee  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.

          DCR: Duff & Phelps Credit Rating Co., or its successor in interest.

          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-8 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 Trustee has
received  through the  Clearing  Agency  evidence of death  satisfactory  to the
Trustee 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 (other than the Class A-10 and A-WIO Certificates)  representing the
principal  portion of the Cut-Off Date Aggregate  Principal Balance evidenced by
such  Certificate.  As to the Class A-10  Certificate,  the Original  Class A-10
Notional Amount.  As to the Class A-WIO  Certificates,  the Percentage  Interest
specified on the face of each 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 7.50%.

          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 Trustee, such that the Trustee, 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 two  separate  REMICs or result in the  imposition  of any
federal tax on either of the Upper-Tier REMIC or Lower-Tier 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-8
     Certificates,  without giving effect to the guaranty  provided by Financial
     Security) 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-8  Certificates,  without giving
     effect to the  guaranty  provided by Financial  Security) 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-8  Certificates,  without  giving  effect  to the  guaranty  provided  by
     Financial Security) 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-8  Certificates,  without  giving  effect  to the  guaranty
     provided by Financial Security) 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-8  Certificates,  without giving
     effect to the  guaranty  provided by Financial  Security) 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 the Norwest Servicing Agreement.

          Exhibit F-3 Mortgage  Loan:  Any of the Mortgage  Loans  identified in
Exhibit  F-3  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.

          Financial  Security:  Financial  Security  Assurance  Inc., a New York
monoline insurance company or any successor thereto.

          Financial  Security  Contact  Person:  The officer  designated  by the
Master Servicer to provide information to Financial Security pursuant to Section
4.08(g).  The initial Financial  Security Contact Person is appointed in Section
11.29.

          Financial  Security  Default:  The existence and continuance of any of
the following:

               (a)  Financial  Security fails to make a payment required under a
          Policy in accordance with its terms;

               (b)  Financial  Security (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 other 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  Financial  Security 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 Financial
          Security (or the taking of possession  of all or any material  portion
          of the property of Financial Security).

          FNMA:  The Federal  National  Mortgage  Association  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  $4,500,826.02  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, partner, director or person performing similar functions.

          Individual  Class  A-8  Certificate:  A Class  A-8  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.

          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 Trustee  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-8  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.

          Lower-Tier Distribution Amount: As defined in Section 4.01(a)(ii).

          Lower-Tier  REMIC:  One of two separate  REMICs  comprising  the Trust
Estate, the assets of which consist of the Mortgage Loans, such amounts as shall
from time to time be held in the Certificate Account, the insurance policies, if
any,  relating to a Mortgage  Loan,  property  which secured a Mortgage Loan and
which has been acquired by foreclosure  or deed in lieu of  foreclosure  and the
rights of the Trustee under the Reserve Fund and the Policy.

          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 11.28.

          Mid-Month Receipt Period:  With respect to each Distribution Date, the
one month period beginning on the  Determination  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.

          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).

          Month End Interest: As defined in each Servicing Agreement.

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

          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 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 Trustee on the Closing Date as part of the Trust Estate and attached  hereto
as Exhibits  F-1, F-2 and F-3,  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 Servicing Fee Rate;

         (xiv) whether such Mortgage Loan is a T.O.P. Mortgage Loan;

          (xv) the Master Servicing Fee; and

         (xvi) for  Mortgage  Loans  identified  on Exhibit F-3, 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 Trustee 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.

          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  Liquidated  Loan,  Liquidation
Proceeds net of Liquidation  Expenses.  For all purposes of this Agreement,  Net
Liquidation  Proceeds shall be allocated first to accrued and unpaid interest on
the related Mortgage Loan and then to the unpaid principal balance thereof.

          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  Servicing  Fee Rate,  as set forth in Section  11.27 with respect to
such  Mortgage  Loan and (b) the  Master  Servicing  Fee  Rate,  as set forth in
Section  11.28  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 Partial Liquidation  Proceeds:  Partial Liquidation  Proceeds with
respect to a Mortgage Loan net of  unreimbursed  Liquidation  Expenses  incurred
with respect to such  Mortgage  Loan.  For all purposes of this  Agreement,  Net
Partial  Liquidation  Proceeds  shall be  allocated  first to accrued and unpaid
interest on the related Mortgage Loan and then to the unpaid  principal  balance
thereof.

          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 7.50%.

          Non-PO  Voting  Interest:  The ratio  obtained  by  dividing  the Pool
Balance (Non-PO Portion) by the sum of the Pool Balance (Non-PO Portion) and the
Pool Balance (PO Portion).

          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 Trustee,  as
the case may be, and which the  Servicer  or the Master  Servicer or the Trustee
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 Trustee  (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 Trustee or, in the case
of a Master  Servicer  determination,  an  Officer's  Certificate  of the Master
Servicer  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  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,  the Class M Principal Balance and the
Class B  Principal  Balance,  (b)  the  Class M  Certificates  according  to the
percentage  obtained by dividing the Class M Principal Balance by the sum of the
Class A Non-PO Principal Balance,  the Class M Principal Balance and the Class B
Principal  Balance and (c) 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,  the  Class M  Principal  Balance  and  the  Class B
Principal Balance.

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

          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 and Exhibit F-2 Mortgage Loans initially by Norwest
Mortgage.

          Notice  of  Claim:  The  notice  to be  delivered  by the  Trustee  to
Financial  Security with respect to any Distribution Date as to which there is a
Class A-8  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.

          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; 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 the Class M Certificates or
any Class B Subclass and any Distribution Date, an Optimal Adjustment Event will
occur with  respect to such Class or Subclass if: (i) the  principal  balance of
such Class or Subclass 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) any Class A  Subclass  Principal
Balance would be subject to further  reduction as a result of the third or fifth
sentences of the  definition of Class A Subclass  Principal  Balance or (b) with
respect to any Class B Subclass,  the Class M  Principal  Balance or the Class B
Subclass  Principal  Balance  of a  Class  B  Subclass  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 M  Principal
Balance,  Class B-1 Principal Balance,  Class B-2 Principal  Balance,  Class B-3
Principal Balance, Class B-4 Principal Balance or Class B-5 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
Class A Subclass  Principal  Balances  of the Class A-1,  Class A-2,  Class A-3,
Class A-4,  Class A-5,  Class A-6,  Class A-7, Class A-8, Class A-9, Class A-11,
Class  A-12,  Class A-R and Class  A-LR  Certificates,  as set forth in  Section
11.06.

          Original Class A Subclass Principal Balance: Any of the Original Class
A Subclass Principal Balances as set forth in Section 11.05.

          Original Class A-10 Notional Amount:  The Original Class A-10 Notional
Amount, as set forth in Section 11.07.

          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 and Original Class B-5
Principal Balance, as set forth in Section 11.17.

          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 and the Original Class B-5 Principal Balance by the sum of
the Original Class A Non-PO  Principal  Balance,  the Original Class M Principal
Balance and the  Original  Class B Principal  Balance.  The  Original  Class B-1
Fractional Interest is specified in Section 11.19.

          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 and the Original
Class B-5 Principal  Balance by the sum of the Original Class A Non-PO Principal
Balance,  the  Original  Class M  Principal  Balance  and the  Original  Class B
Principal  Balance.  The Original Class B-2 Fractional  Interest is specified in
Section 11.20.

          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 and the Original Class B-5 Principal Balance by the sum of the
Original  Class A Non-PO  Principal  Balance,  the  Original  Class M  Principal
Balance and the  Original  Class B Principal  Balance.  The  Original  Class B-3
Fractional Interest is specified in Section 11.21.

          Original Class B-4 Fractional  Interest:  As to the first Distribution
Date,  the  percentage  obtained by dividing  the Original  Class B-5  Principal
Balance  by the  sum of the  Original  Class A  Non-PO  Principal  Balance,  the
Original Class M Principal  Balance and the Original Class B Principal  Balance.
The Original Class B-4 Fractional Interest is specified in Section 11.22.

          Original  Class B-1  Percentage:  The Class B-1  Percentage  as of the
Cut-Off Date, as set forth in Section 11.12.

          Original  Class B-2  Percentage:  The Class B-2  Percentage  as of the
Cut-Off Date, as set forth in Section 11.13.

          Original  Class B-3  Percentage:  The Class B-3  Percentage  as of the
Cut-Off Date, as set forth in Section 11.14.

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

          Original  Class B-5  Percentage:  The Class B-5  Percentage  as of the
Cut-Off Date, as set forth in Section 11.16.

          Original Class B-1 Principal Balance:  The Class B-1 Principal Balance
as of the Cut-Off Date, as set forth in Section 11.18.

          Original Class B-2 Principal Balance:  The Class B-2 Principal Balance
as of the Cut-Off Date, as set forth in Section 11.18.

          Original Class B-3 Principal Balance:  The Class B-3 Principal Balance
as of the Cut-Off Date, as set forth in Section 11.18.

          Original Class B-4 Principal Balance:  The Class B-4 Principal Balance
as of the Cut-Off Date, as set forth in Section 11.18.

          Original Class B-5 Principal Balance:  The Class B-5 Principal Balance
as of the Cut-Off Date, as set forth in Section 11.18.

          Original  Class M Fractional  Interest:  As to the first  Distribution
Date, the percentage obtained by dividing the Original Class B Principal Balance
by the sum of the Original Class A Non-PO Principal Balance,  the Original Class
M Principal  Balance and the Original  Class B Principal  Balance.  The Original
Class M Fractional Interest is specified in Section 11.11.

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

          Original Class M Principal  Balance:  The Class M Principal Balance as
of the Cut-Off Date, as set forth in Section 11.10.

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

          Original Subordinated Principal Balance: The sum of the Original Class
M Principal Balance and the Original Class B Principal Balance.

          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 Trustee (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.

          PAC Certificates: The Class A-1 Certificates.

          PAC Principal Amount: As defined in Section 4.01(b).

          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 Trustee, 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.  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 (other than
the Class A-10 Certificate or Class A-WIO Certificate), the undivided percentage
interest obtained by dividing the original principal balance of such Certificate
by the aggregate  original principal balance of all Certificates of such Class A
Subclass.  With respect to the Class A-10  Certificate,  100%. With respect to a
Class A-WIO Certificate,  the percentage  interest specified on the face of such
Certificate.  With respect to a Class M  Certificate,  the undivided  percentage
interest obtained by dividing the original principal balance of such Certificate
by the aggregate  original  principal balance of all Certificates of such Class.
With  respect  to a Class  B  Certificate,  the  undivided  percentage  interest
obtained by dividing the original  principal  balance of such Certificate by the
aggregate  original  principal  balance  of all  Certificates  of  such  Class B
Subclass.

          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 Trustee  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 Trustee  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
Trustee,  as the case may be and (z) have  not  been  determined  by the  Master
Servicer, such Servicer or Trustee 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  Financial  Guaranty  Insurance  Policy  No.
50573-N,  including any endorsements thereto,  issued by Financial Security with
respect to the Class A-8 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 Trustee  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
Trustee 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 Trustee has made one or more
     unreimbursed Periodic Advances;

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

          (c)  those  portions  of each  payment  of  interest  on a  particular
     Mortgage Loan which represent (i) the applicable Servicing Fee and (ii) 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 Subclasses of the Class
     A or Class B Certificates  or the Class M Certificates  pursuant to Section
     4.02.

          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  Mortgage  Loan: A Mortgage Loan with a Net Mortgage  Interest
Rate 7.50% or greater.

          Premium Payment:  As to any Distribution  Date, (i) the product of (a)
1/12th of 0.075% and (b) the Class A Subclass Principal Balance of the Class A-8
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  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  Financial  Security  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 Financial Security
on or after the Cross-Over Date pursuant to Section 4.02(e). The Premium Payment
will be an expense of the Lower-Tier 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 Class
A Subclass  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 Financial  Security on such Distribution Date pursuant to
Paragraph first of Section 4.01(a)(i).

          Premium  Shortfall  Percentage:  As  to  any  Distribution  Date,  the
percentage calculated by dividing the Premium Unpaid Shortfall by the sum of the
Class A Unpaid Interest Shortfall and the Premium Unpaid Shortfall, in each case
determined as of the day preceding the applicable Distribution Date.

          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 Financial Security
on prior Distribution Dates pursuant to Paragraph second of Section 4.01(a)(i).

          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 M Optimal Principal
Amount,  Class B-1 Optimal Principal Amount, Class B-2 Optimal Principal Amount,
Class B-3 Optimal Principal Amount,  Class B-4 Optimal Principal Amount or Class
B-5 Optimal  Principal  Amount is calculated  in accordance  with the proviso in
such definition with respect to any Distribution Date, the Principal  Adjustment
for the Class M Certificates or such Class B Subclass shall equal the difference
between  (i) the  amount  that  would  have been  distributed  to such  Class or
Subclass  as  principal  in  accordance   with  Section   4.01(a)(i)   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 or Subclass.

          Principal Balance:  Each of the Class A Subclass  Principal  Balances,
the Class M 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.

          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  and Class M
Certificates  are Moody's and DCR.  The Rating  Agency for the Class B-1,  Class
B-2,  Class B-3 and  Class  B-4  Certificates  is DCR.  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,  Financial  Security
and the Master  Servicer.  References  herein to the highest  short-term  rating
category of a Rating  Agency shall mean P-1 in the case of Moody's,  D-1+ in the
case of DCR 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 in the case of DCR, Aaa in the case of Moody's,
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.

          Reduction Amount: As defined in Section 4.01(b).

          Relevant Anniversary: See "Bankruptcy Loss Amount."

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

          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  Trustee  and  maintained  by the  Trustee  for the benefit of the Class A-8
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-8 Certificates.

          Responsible  Officer:  When  used with  respect  to the  Trustee,  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 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 Trustee and
maintained  by the Trustee  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.

          Scheduled Certificates: The Class A-2 Certificates.

          Scheduled Principal Amount: The sum for each outstanding Mortgage Loan
(including  each defaulted  Mortgage Loan,  other than a Liquidated  Loan,  with
respect to which the related  Mortgaged  Property has been acquired by the Trust
Estate) of the product of (A) the Non-PO Fraction for such Mortgage Loan and (B)
the sum of the amounts  described in clauses y(i) and y(iv) of the definition of
Class A Non-PO Optimal Principal Amount.

          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 related 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.

          Senior Accrual Amount:  With respect to any Distribution Date, the sum
of the Class A Interest Accrual Amount and the Premium Payment.

          Senior Optimal Amount:  As to any Distribution  Date, the sum for such
Distribution  Date of (a) the Class A Non-PO  Optimal  Amount  and (b) the Class
A-PO Optimal Principal Amount.

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

          Servicers:  Each of Norwest  Mortgage,  Countrywide Home Loans,  Inc.,
First Bank  National  Association,  HomeSide  Lending,  National  City  Mortgage
Company and Suntrust  Mortgage  Inc.,  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 11.27.

          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(e).

          Single  Certificate:  A  Certificate  of any  Class or  Subclass  that
evidences the smallest permissible  Denomination for such Class or Subclass,  as
set forth in Section 11.26.

          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 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 a Servicing Agreement.

          Special  Hazard Loss Amount:  As of any  Distribution  Date, an amount
equal to  $2,250,413.01  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  Trustee.  On and or 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) 1.00% 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.

          Subclass:  Each  subdivision of the Class A Certificates,  denominated
respectively  as Class A-1,  Class A-2,  Class A-3,  Class A-4, Class A-5, Class
A-6, Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11, Class A-12, Class
A-PO, Class A-WIO,  Class A-R and Class A-LR and each subdivision of the Class B
Certificates, denominated respectively as Class B-1, Class B-2, Class B-3, Class
B-4 and Class B-5.

          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.

          T.O.P. Mortgage Loan: Any Mortgage Loan that was originated by Norwest
Mortgage or an  affiliate  thereof in  connection  with the "Title  Option Plus"
program  and which is not  covered  by a title  insurance  policy.  Each  T.O.P.
Mortgage Loan shall be identified as such in the Mortgage Loan Schedule.

          Trust  Estate:  The  corpus of the trust  created  by this  Agreement,
consisting of the Mortgage Loans,  such amounts as may be held from time to time
in the Certificate Account and the rights 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 and the rights of the Trustee under the Reserve Fund and the
Policy.  None of the Reserve  Fund,  the Policy or the Policy  Payments  Account
shall be part of the Upper-Tier REMIC or Lower-Tier REMIC comprised by the Trust
Estate.

          Trustee:  First  Union  National  Bank of North  Carolina,  a national
banking association.

          Uncertificated  Lower-Tier  Interests:  Any of the Class  A-L1,  Class
A-L2, Class A-L9, Class AP-L, Class AIO-L,  Class A-LUR,  Class M-L, Class B-L1,
Class B-L2, Class B-L3, Class B-L4 and Class B-L5 Interests.

          Unpaid  Interest  Shortfalls:  Each  of the  Class A  Subclass  Unpaid
Interest Shortfalls, the Class M Unpaid Interest Shortfall, 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 and the Class
B-5 Unpaid Interest Shortfall.

          Unscheduled  Principal Amount:  The sum for each outstanding  Mortgage
Loan (including each defaulted Mortgage Loan, other than a Liquidated Loan, with
respect to which the related  Mortgaged  Property has been acquired by the Trust
Estate) of the product of (A) the Non-PO Fraction for such Mortgage Loan and (B)
the sum of the amounts  described in clauses y(ii) and y(iii) of the  definition
of Class A Non-PO Optimal Principal Amount.

          Unscheduled Principal Receipt: Any Mortgagor payment or other recovery
of principal 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,  including, without limitation,  Principal
Prepayments,  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 and excluding any Net Foreclosure
Profits and  proceeds of a repurchase  of a Mortgage  Loan by the Seller and any
Substitution Principal Amounts.

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

          Upper-Tier  Certificate:  Any one of the Class A  Certificates  (other
than the  Class  A-LR  Certificate),  the Class M  Certificates  and the Class B
Certificates.

          Upper-Tier  Certificate  Account:  The trust account  established  and
maintained pursuant to Section 4.01(e).

          Upper-Tier  REMIC: One of the two separate REMICs comprising the Trust
Estate, the assets of which consist of the Uncertificated  Lower-Tier  Interests
and  such  amounts  as  shall  from  time to  time  be  held  in the  Upper-Tier
Certificate Account.

          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,  (a) the Holders of the Class A
Certificates will  collectively be entitled to the Class A Voting Interest,  (b)
the Holders of the Class M  Certificates  will  collectively  be entitled to the
then applicable  percentage of the aggregate Voting Interest  represented by all
Certificates  equal to the product of (i) the ratio  obtained  by  dividing  the
Class M Principal  Balance by the sum of the Class A Non-PO  Principal  Balance,
the Class M Principal  Balance  and the Class B  Principal  Balance and (ii) the
Non-PO  Voting  Interest  and (c) the Holders of the Class B  Certificates  will
collectively  be  entitled  to the  balance  of the  aggregate  Voting  Interest
represented by all Series 1997-4 Certificates. The aggregate Voting Interests of
each Subclass of Class A  Certificates  (other than the Class A-10,  Class A-WIO
and Class A-PO Certificates) on any date will be equal to the product of (a) 98%
of the  Class A Voting  Interest  represented  by clause  (A) of the  definition
thereof and (b) the fraction obtained by dividing the Class A Subclass Principal
Balance of such Class A Subclass by the Class A Non-PO Principal Balance on such
date. The Voting  Interest of the Class A-10  Certificate on any date will be 1%
of the amount of the Class A Voting Interest on such date  represented by clause
(A) of the  definition of Class A Voting  Interest.  The Voting  Interest of the
Class  A-WIO  Certificates  on any date will be 1% of the  amount of the Class A
Voting  Interest on such date  represented  by clause (A) of the  definition  of
Class A Voting  Interest.  The  aggregate  Voting  Interests  of the Class  A-PO
Certificates  on  any  date  will  be  equal  to the  Class  A  Voting  Interest
represented  by clause  (B) of the  definition  thereof.  The  aggregate  Voting
Interests of each Subclass of Class B  Certificates  will equal such  Subclass's
pro rata portion of the Voting  Interest  allocated to the Class B  Certificates
based on such Subclass's  outstanding principal balance. Each  Certificateholder
of a Class or Subclass will have a Voting  Interest  equal to the product of the
Voting Interest to which such Class or Subclass is collectively entitled and the
Percentage  Interest  in such Class or  Subclass  represented  by such  Holder's
Certificates.  With  respect to any  provisions  hereof  providing  for  action,
consent or  approval  of each Class or Subclass  of  Certificates  or  specified
Classes or  Subclasses of  Certificates,  each  Certificateholder  of a Class or
Subclass  will have a Voting  Interest in such Class or  Subclass  equal to such
Holder's Percentage Interest in such Class or Subclass.

          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.  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,  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 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 and the  Authenticating  Agent)
shall be proved by the Certificate Register, and neither the Trustee, 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
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, the Holders of the Certificates and Financial Security 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  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 Trustee,  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  Trustee 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
Trustee 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  Trustee 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 Trustee within one (1)
year  following  the  Closing  Date any  original  Mortgage or  assignment  of a
Mortgage not delivered to the Trustee on the Closing Date.

          In lieu of recording an  assignment  of any Mortgage  the  Seller may,
to  the  extent  set  forth  in  any Servicing Agreement, deliver or cause to be
delivered to the Trustee the  assignment  of the Mortgage Loan  from  the Seller
to the Trustee 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 Trustee within five Business Days (or such other  reasonable  period of time
mutually agreed upon by the Master  Servicer  and the Trustee) of its receipt of
such notice and deliver each  previously  unrecorded  assignment  to the related
Servicer for recordation.

Section 2.02.  Acceptance by Trustee.

          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 Trustee  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 Trustee 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 Trustee  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 Trustee  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
Trustee'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 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 Trustee 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, Master Servicer
or Trustee  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 Trustee 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 Trustee 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  or the  Trustee  on  behalf of the  Certificateholders.  The
failure of the Trustee 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 Trustee 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 Trustee  appoints a Custodian to
hold the Mortgage  Notes,  the Mortgages,  the  assignments  and other documents
related to the Mortgage  Loans  received by 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 Trustee for the benefit of  Certificateholders  that,  as of the date of
execution of this Agreement:

          (i)  The  Master  Servicer  is a  national  banking  association  duly
     chartered  and  validly  existing  in good  standing  under the laws of the
     United States;

          (ii) 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 Servicer or
     any of its assets;

          (iii)  This  Agreement,  assuming  due  authorization,  execution  and
     delivery  by the Trustee 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;

          (iv) 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

          (v) 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 Trustee or the Custodian.

          (b) The Seller hereby  represents  and warrants to the Trustee 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 Trustee 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 Trustee 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 Trustee by the Seller;

          (viii)  Except  for  Mortgage  Loans  secured  by  Co-op  Shares,  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 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  identified  on the
     Mortgage  Loan  Schedule as a T.O.P.  Mortgage  Loan and any Mortgage  Loan
     secured by Mortgaged  Property  located in Iowa,  as to which an opinion of
     counsel  of the type  customarily  rendered  in such State 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 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  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 Flood  Disaster  Protection Act of 1973; 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 of the Code; and

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

          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  Trustee  and  shall  inure to the  benefit  of the
Trustee, notwithstanding any restrictive or qualified endorsement or assignment.

          (c) Upon  discovery  by either the Seller,  the Master  Servicer,  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 Trustee 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 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 Trustee  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,  (i)  acknowledges  the issuance of and hereby  declares that it
holds the Uncertificated  Lower-Tier Interests on behalf of the Upper-Tier REMIC
and  Certificateholders and (ii) has executed and delivered to or upon the order
of the Seller, in exchange for the Mortgage Loans and Uncertificated  Lower-Tier
Interests  together with all other assets  included in the  definition of "Trust
Estate",  receipt of which is hereby  acknowledged,  Certificates  in authorized
denominations  which,  together with the  Uncertificated  Lower-Tier  Interests,
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  Subclasses of Class A Certificates
(other than the Class A-R and Class A-LR Certificates), the Class M Certificates
and the Subclasses of Class B Certificates as classes of "regular interests" and
the Class A-R  Certificate  as the single  class of  "residual  interest" in the
Upper-Tier  REMIC for the purposes of Code Sections  860G(a)(1) and  860G(a)(2),
respectively.  The Seller hereby  further  designates  the Class A-L1  Interest,
Class A-L2  Interest,  Class A-L8  Interest,  Class  A-L9  Interest,  Class AP-L
Interest, Class AIO-L Interest, Class A-LUR Interest, Class B-L1 Interest, Class
B-L2 Interest, Class B-L3 Interest, Class B-L4 Interest, Class B-L5 Interest and
Class M-L  Interest  as  classes  of  "regular  interests"  and the  Class  A-LR
Certificate as the single class of "residual  interest" in the Lower-Tier  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 each of the Upper-Tier
REMIC and the  Lower-Tier  REMIC within the meaning of Code Section  860G(a)(9).
The "latest possible  maturity date" of the regular  interests in the Upper-Tier
REMIC  and  Lower-Tier  REMIC is April 25,  2027 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 Trustee, if any; 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
either of the Upper-Tier  REMIC or the Lower-Tier  REMIC 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.

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 Trustee or any Servicer for
     Periodic  Advances made by the Master  Servicer or the Trustee  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 Trustee for
     any   Periodic   Advances   determined   in  good  faith  to  have   become
     Nonrecoverable Advances;

          (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 Trustee (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 Net
     Liquidation  Proceeds allocable to interest the amount of any unpaid Master
     Servicing  Fee or Servicing  Fee (as adjusted  pursuant to such  Servicer's
     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; and

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

          (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 Trustee.

          (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  Trustee  shall,  to the extent  required by Section  8.15,  make such
Periodic  Advance to the extent provided  hereby,  provided that the Trustee has
previously  received the  certificate  of the Master  Servicer  described in the
following  sentence.  The Master  Servicer  shall  certify to the  Trustee  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,  (iii) the  amount  that the  Trustee 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 Trustee or Master Servicer shall
be  deposited  in the  Certificate  Account on the  related  Distribution  Date.
Notwithstanding the foregoing,  neither the Master Servicer nor the Trustee will
be obligated  to make a Periodic  Advance  that it  reasonably  believes to be a
Nonrecoverable  Advance. The Trustee 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
Trustee that such failure has occurred. Upon receipt of such certification,  the
Trustee  shall  advance  such funds and take such steps as are  necessary to pay
such taxes or insurance premiums.

          (c) The Master  Servicer and the Trustee  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 Trustee 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  Trustee,  withdraw
from the  Certificate  Account and remit to the Trustee any amounts to which the
Trustee 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 Trustee  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.  Trustee 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 Trustee  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  Trustee.  The
Trustee  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 Trustee and the Trustee 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
Trustee 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 Trustee 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 Trustee to the Master  Servicer
or such Servicer, as appropriate.

          Upon written  certification  of the Master Servicer or the Servicer of
such Mortgage Loan, the Trustee 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 Trustee and a  statement  as to the reason  such  documents  or
pleadings  are  required  and that the  execution  and  delivery  thereof by the
Trustee 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; Annual Compliance
               Statements.

          (a) Not later than 15 days after each  Distribution  Date,  the Master
Servicer  shall  deliver to the Trustee 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 Trustee to any Certificateholder upon written
request, provided such statement is delivered, or caused to be delivered, by the
Master Servicer to the Trustee.

          (b) The Master  Servicer  shall  deliver  to the  Trustee 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  Trustee  to  any
Certificateholder  upon written request  provided such certificate is delivered,
or caused to be delivered, by the Master Servicer to the Trustee.

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 Trustee 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 Trustee  shall have no further  responsibility  with regard to such
Owner  Mortgage Loan File or Servicer  Mortgage Loan File.  Neither the Trustee,
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  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 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  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 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,  the
Trustee  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  or the  Trustee,  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 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  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 Upper-Tier  REMIC or the  Lower-Tier  REMIC of REMIC status
for  federal  income tax  purposes  or (iii) the  imposition  of any  Prohibited
Transaction  Tax or any  federal  taxes on  either  the  Upper-Tier  REMIC,  the
Lower-Tier 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 Trustee 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  Trustee 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  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 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,  at its  option,  to  repurchase  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;  provided,  however,  that the Cut-Off
Date  Principal  Balances of the  Mortgage  Loans  repurchased  pursuant to this
provision shall not exceed 2.5% of the Cut-Off Date Aggregate  Principal Balance
of the Mortgage  Loans.  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 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 Trustee the certification required by Section 3.04
and the Trustee 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 Trustee 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
Trustee shall have no further  responsibility with regard to such Owner Mortgage
Loan File or  Servicer  Mortgage  Loan File.  Neither  the  Trustee,  the Master
Servicer  nor any  Servicer,  acting  on behalf of the  Trustee,  shall  provide
financing from the Trust Estate to any purchaser of a Mortgage Loan.

          The Master Servicer, on behalf of the Trustee,  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 Upper-Tier  REMIC or
Lower-Tier REMIC.

          The Master Servicer may enter into a special servicing  agreement with
an unaffiliated  holder of 100%  Percentage  Interest of a Class B Subclass 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-8 Certificates,  giving effect to the guaranty provided by Financial Security)
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 Trustee is  obligated  to make an advance  pursuant to Section 3.03 and (ii)
the Trustee 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 Trustee  shall  terminate  the  Norwest  Servicing
Agreement without the recommendation of the Master Servicer. 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  attorneys'  fees) arising out of, or assessed against the Trustee in
connection with termination of such Servicing  Agreement at the direction of the
Master Servicer. 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 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.  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
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)(i) 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  Subclasses  of  Class  A  Certificates  and  Financial
Security,  pro rata,  based upon  their  respective  Class A  Subclass  Interest
Accrual Amounts and the Premium Payment, respectively, in an aggregate amount up
to the sum of the Class A Subclass  Interest  Accrual  Amounts  and the  Premium
Payment  with respect to such  Distribution  Date;  provided,  that prior to the
Accretion  Termination  Date, an amount equal to the amount that would otherwise
be  distributable  in respect of  interest  to the Class A-3  Certificates  will
instead be distributed in reduction of the Class A Subclass  Principal  Balances
of the Class A-2 and Class A-3 Certificates in accordance with Section 4.01(b);

          second,  to the  Subclasses  of  Class A  Certificates  and  Financial
Security, pro rata, based upon their respective Class A Subclass Unpaid Interest
Shortfalls and Premium Unpaid Shortfalls,  respectively,  in an aggregate amount
up to the sum of the Class A Subclass  Unpaid  Interest  Shortfalls  and Premium
Unpaid Shortfalls;  provided,  that prior to the Accretion  Termination Date, an
amount equal to the amount that would otherwise be  distributable  in respect of
interest shortfalls to the Class A-3 Certificates will instead be distributed in
reduction of the Class A Subclass  Principal Balances of the Class A-2 and Class
A-3 Certificates in accordance with Section 4.01(b);

          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 Subclasses 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
Subclasses 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-5 Certificates pursuant to Paragraph
twenty-second, below, second to the Class B-4 Certificates pursuant to Paragraph
nineteenth,  below,  third to the Class B-3  Certificates  pursuant to Paragraph
sixteenth,  below,  fourth to the Class B-2  Certificates  pursuant to Paragraph
thirteenth,  below,  fifth to the Class B-1  Certificates  pursuant to Paragraph
tenth below, and sixth to the Class M Certificates pursuant to Paragraph seventh
below;

          fifth,  to the  Class M  Certificates  in an  amount up to the Class M
Interest Accrual Amount with respect to such Distribution Date;

          sixth,  to the  Class M  Certificates  in an  amount up to the Class M
Unpaid Interest Shortfall;

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

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

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

          tenth, 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 tenth 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;

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

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

          thirteenth, 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  thirteenth  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;

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

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

          sixteenth,  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  sixteenth  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;

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

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

          nineteenth, 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  nineteenth  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; and

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

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

          twenty-second,  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
twenty-second  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; and

          twenty-third, to the Holder of the Class A-LR Certificate, any amounts
remaining in the Upper-Tier  Certificate Account, and to the Holder of the Class
A-LR Certificate, any amounts remaining in the Payment Account.

          Notwithstanding the foregoing, after the Principal Balance or notional
amount  of any  Class or  Subclass  (other  than  the  Class  A-R or Class  A-LR
Certificate)  has been reduced to zero,  such Class or Subclass will be entitled
to no  further  distributions  of  principal  or  interest  (including,  without
limitation, any Unpaid Interest Shortfalls).

          In addition,  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-LR
Certificate.

          With respect to any  Distribution  Date,  the amount of the  Principal
Adjustment,  if any,  attributable to any Class B Subclass will be allocated pro
rata based on principal  balance among the Class A Certificates  (other than the
Class A-10, Class A-WIO and Class A-PO  Certificates),  the Class M Certificates
and any Class B Subclass with a lower  numerical  designation  and the amount of
the Principal Adjustment,  if any, attributable to the Class M Certificates will
be allocated to the  Subclasses  of Class A  Certificates  (other than the Class
A-10,  Class  A-WIO and Class A-PO  Certificates)  pro rata based on the Class A
Subclass Principal Balances.

          Any amount allocated to the Class A-8 Certificates will be distributed
to holders thereof as a reduction of the Class A Subclass  Principal  Balance of
the Class A-8 Certificates in accordance with the provisions of Section 4.07.

          (ii) Distributions on the Uncertificated Lower-Tier Interests. On each
Distribution  Date,  each  Uncertificated   Lower-Tier  Interest  shall  receive
distributions  in  respect  of  principal  in an amount  equal to the  amount of
principal  distributed  to its  respective  Corresponding  Upper-Tier  Class  or
Classes as provided  herein.  On each  Distribution  Date,  each  Uncertificated
Lower-Tier  Interest  (other  than the Class  A-L9  Interest  and the Class AP-L
Interest) shall receive  distributions in respect of interest in an amount equal
to the (i) Class A Subclass  Interest Accrual Amount and Class A Subclass Unpaid
Interest  Shortfall,  (ii)  Class M Interest  Accrual  Amount and Class M Unpaid
Interest Shortfall or (iii) Class B Subclass Interest Accrual Amount and Class B
Subclass  Unpaid  Interest  Shortfall,  as the case may be,  in  respect  of its
Corresponding  Upper-Tier  Class or Classes in each case to the extent  actually
distributed (or, in the case of the Class A-3  Certificates,  accrued)  thereon.
Such amounts distributed to the Uncertificated  Lower-Tier  Interests in respect
of principal and interest with respect to any Distribution  Date are referred to
herein collectively as the "Lower-Tier Distribution Amount."

          As  of  any  date,  the  principal  balance  of  each   Uncertificated
Lower-Tier  Interest  (other than the Class AIO-L  Interest)  equals the Class A
Subclass  Principal  Balance,  Class M  Principal  Balance  or Class B  Subclass
Principal  Balance,  as  the  case  may  be,  of  the  respective  Corresponding
Upper-Tier Class or Classes.  The Class AIO-L Interest has no principal balance.
The notional balance of the Class AIO-L Interest equals the aggregate  Scheduled
Principal  Balance of the Premium  Mortgage  Loans as of such date.  The initial
principal  balance of each  Uncertificated  Lower-Tier  Interest (other than the
Class AIO-L Interest)  equals the Original Class A Subclass  Principal  Balance,
Original  Class M  Principal  Balance,  Original  Class B-1  Principal  Balance,
Original  Class B-2 Principal  Balance,  Original  Class B-3 Principal  Balance,
Original Class B-4 Principal  Balance or Original Class B-5 Principal Balance as
the case may be, of the respective  Corresponding  Upper-Tier  Class or Classes.
The Class AIO-L Interest has no initial principal balance.

          The pass-through rate with respect to each  Uncertificated  Lower-Tier
Interest  (other than the Class A-L9  Interest,  Class AIO-L  Interest and Class
AP-L Interest) shall be 7.50% per annum. The  pass-through  rate with respect to
the Class AIO-L Interest shall be the Class A-WIO  Pass-Through  Rate. The Class
A-L9 Interest and the Class AP-L Interest are  principal-only  interests and are
not entitled to distributions of interest. Any Non-Supported Interest Shortfalls
will be  allocated  to  each  Uncertificated  Lower-Tier  Interest  in the  same
relative proportions as interest is allocated to such Uncertificated  Lower-Tier
Interest.

          (b) On  each  Distribution  Date  occurring  prior  to  the  Accretion
Termination Date, an amount equal to the Class A-3 Accrual  Distribution Amount,
if any,  for such  Distribution  Date  will be  allocated  in  reduction  of the
principal  balances  of the Class A-2 and Class  A-3  Certificates  as  follows:
first,  to the Class A-2  Certificates  up to their  Reduction  Amount  for such
Distribution Date, until the Class A Subclass Principal Balance thereof has been
reduced to zero and  second,  to the Class A-3  Certificates,  until the Class A
Subclass Principal Balance thereof has been reduced to zero.

          On each  Distribution Date occurring prior to the Cross-Over Date, the
Class  A-Non-PO  Principal  Amount will be allocated  among and  distributed  in
reduction of the Class A Subclass Principal Balances of the Class A Certificates
(other than the Class A-PO Certificates) as follows:

          first, to the Class A-11 and Class A-12 Certificates,  pro rata, up to
the Class A-11 and Class A-12 Priority Amount;

          second,  on each  Distribution Date on and after the Distribution Date
in April 2000, but only so long as the Class A Subclass Principal Balance of the
Class A-7 Certificates is greater than zero, concurrently,  to the Class A-8 and
Class A-9  Certificates,  pro rata,  an amount up to  $30,000  until the Class A
Subclass  Principal Balance of the Class A-8 and Class A-9 Certificates has been
reduced to zero;

          third, concurrently, as follows:

               (i) 32.2195678808% sequentially as follows:

                    (A) to the Class A-1  Certificates up to their PAC Principal
               Amount  for such  Distribution  Date,  until the Class A Subclass
               Principal Balance thereof has been reduced to zero;

                    (B) to the  Class  A-2  Certificates  up to their  Reduction
               Amount  for such  Distribution  Date,  until the Class A Subclass
               Principal Balance thereof has been reduced to zero;

                    (C) to  the  Class  A-3  Certificates,  until  the  Class  A
               Subclass Principal Balance thereof has been reduced to zero;

                    (D) to the Class A-2  Certificates  without  regard to their
               Reduction Amount and until the Class A Subclass Principal Balance
               thereof has been reduced to zero;

                    (E) to the Class A-1  Certificates  without  regard to their
               PAC  Principal  Amount and until the Class A  Subclass  Principal
               Balance thereof has been reduced to zero;

               (ii) 67.7804321192% sequentially as follows:

                    (A)   concurrently,   33.5245474186%   to  the   Class   A-4
               Certificates and  66.4754525814%  to the Class A-6  Certificates,
               until the Class A  Subclass  Principal  Balance  of the Class A-4
               Certificates has been reduced to zero;

                    (B)   concurrently,   93.7925790282%   to  the   Class   A-5
               Certificates  and  6.2074209718%  to the Class A-6  Certificates,
               until the Class A  Subclass  Principal  Balance  of the Class A-5
               Certificates has been reduced to zero;

                    (C)   concurrently,   71.4796283059%   to  the   Class   A-6
               Certificates and  28.5203716941%  to the Class A-7  Certificates,
               until the Class A  Subclass  Principal  Balance  of the Class A-6
               Certificates  has been  reduced  32.5412690224%  of its  Original
               Class A Subclass Principal Balance;

          fourth, concurrently, 77.0869930497% to the Class A-6 Certificates and
22.9130069503%  to the  Class  A-7  Certificates,  until  the  Class A  Subclass
Principal Balance of the Class A-6 Certificates has been reduced to zero;

          fifth,  to the Class  A-7  Certificates,  until  the Class A  Subclass
Principal Balance thereof has been reduced to zero;

          sixth, concurrently,  to the Class A-8 and the Class A-9 Certificates,
pro rata, until the Class A Subclass Principal Balance of each such Subclass has
been reduced to zero;

          seventh,   concurrently,   to  the  Class  A-R  and  the  Class   A-LR
Certificates,  pro rata,  until the Class A Subclass  Principal  Balance of each
such Subclass has been reduced to zero; and

          eighth,  concurrently,  to   the   Class  A-11  and  the  Class  A-12 
Certificates, pro rata, without regard to the Class A-11 and Class A-12 Priority
Amount,  until  the Class A Subclass Principal Balance of each such Subclass has
been reduced to zero.

          As used above,  "PAC Principal Amount" for any Distribution Date means
the amount, if any, that would reduce the Class A Subclass  Principal balance of
the Class A-1  Certificates to the percentage of its Class A Subclass  Principal
Balance shown in the following tables with respect to such Distribution Date.

          As used above,  "Reduction Amount" for any Distribution Date means the
amount, if any, that would reduce the Class A Subclass  Principal balance of the
Class A-2  Certificates  to the  percentage  of its Class A  Subclass  Principal
Balance shown in the following tables with respect to such Distribution Date.

          The following tables set forth for each  Distribution Date the planned
Class A Subclass  Principal  Balance of the PAC  Certificates  and the scheduled
Class A Subclass Principal Balance for the Scheduled Certificates,  expressed as
a  percentage  of the initial  Class A Subclass  Principal  Balance of each such
Subclass.


<PAGE>


<TABLE>
<CAPTION>


                   Planned Class A Subclass Principal Balances
          as Percentages of Initial Class A Subclass Principal Balances

                             Class A-1 Certificates


                         Percentage of                          Percentage of                           Percentage of
                         Initial Class                         Initial Class A                          Initial Class
                          A Subclass                               Subclass                              A Subclass
                           Principal                              Principal                               Principal
 Distribution Date          Balance      Distribution Date         Balance       Distribution Date         Balance
<S>                      <C>             <C>                     <C>             <C>                    <C>
Up to and including                      November 1999           66.31983497%    July 2001              29.51532659%
March 1998               100.00000000%   December 1999           64.34864438     August 2001            27.78226361
April 1998                98.82118314    January 2000            62.38732302     September 2001         26.05811105
May 1998                  97.58229958    February 2000           60.43582059     October 2001           24.34282354
June 1998                 96.28385484    March 2000              58.49408689     November 2001          22.63635603
July 1998                 94.92638517    April 2000              56.61209211     December 2001          20.93866363
August 1998               93.51045741    May 2000                54.73976666     January 2002           19.24970172
September 1998            92.03666850    June 2000               52.87706112     February 2002          17.56942595
October 1998              90.50564505    July 2000               51.02392652     March 2002             15.89779218
November 1998             88.91820751    August 2000             49.18031401     April 2002             14.41003840
December 1998             87.27507804    September 2000          47.34617496     May 2002               12.93084232
January 1999              85.57710790    October 2000            45.52146119     June 2002              11.46016161
February 1999             83.82526542    November 2000           43.70612456     July 2002               9.99795436
March 1999                82.02036954    December 2000           41.90011726     August 2002             8.54417864
April 1999                80.16360096    January 2001            40.10339184     September 2002          7.09879306
May 1999                  78.25645229    February 2001           38.31590095     October 2002            5.66175616
June 1999                 76.30078938    March 2001              36.53759755     November 2002           4.23302691
July 1999                 74.30417683    April 2001              34.76843480     December 2002           2.81256443
August 1999               72.29313015    May 2001                33.00836623     January 2003            1.40032809
September 1999            70.29202675    June 2001               31.25734553     February 2003
October 1999              68.30094546                                            and thereafter          0.00000000

</TABLE>


<PAGE>

<TABLE>
<CAPTION>


                  Scheduled Class A Subclass Principal Balances
          as Percentages of Initial Class A Subclass Principal Balances

                             Class A-2 Certificates


                        Percentage of                           Percentage of                          Percentage of
                       Initial Class A                          Initial Class                         Initial Class A
                           Subclass                              A Subclass                               Subclass
                          Principal                               Principal                              Principal
 Distribution Date         Balance       Distribution Date         Balance      Distribution Date         Balance

<S>                       <C>            <C>                      <C>           <C>                     <C>
April 1997                99.44619955%   October 1999             59.89848990   April 2002              26.97623670%
May 1997                  98.77329720    November 1999            58.40153235   May 2002                26.36540995
June 1997                 97.98151530    December 1999            56.93557180   June 2002               25.77377490
July 1997                 97.07121275    January 2000             55.50017340   July 2002               25.20103870
August 1997               96.04288540    February 2000            54.09490775   August 2002             24.64691225
September 1997            94.89716575    March 2000               52.71935095   September 2002          24.11111020
October 1997              93.63482335    April 2000               51.37308465   October 2002            23.59335090
November 1997             92.25676390    May 2000                 50.05569565   November 2002           23.09335655
December 1997             90.76402895    June 2000                48.76677625   December 2002           22.61085265
January 1998              89.15779470    July 2000                47.50592375   January 2003            22.14556860
February 1998             87.43937095    August 2000              46.27274080   February 2003           21.69421495
March 1998                85.61019950    September 2000           45.06683500   March 2003              20.09017705
April 1998                84.66181505    October 2000             43.88781910   April 2003              18.57849025
May 1998                  83.65650890    November 2000            42.73531075   May 2003                17.08900300
June 1998                 82.59557890    December 2000            41.60893250   June 2003               15.62143265
July 1998                 81.48052490    January 2001             40.50831180   July 2003               14.17550010
August 1998               80.31294195    February 2001            39.43308085   August 2003             12.75092975
September 1998            79.09451780    March 2001               38.38287650   September 2003          11.34744925
October 1998              77.82702970    April 2001               37.35734050   October 2003             9.96478975
November 1998             76.51251050    May 2001                 36.35611890   November 2003            8.60268565
December 1998             75.15293965    June 2001                35.37886260   December 2003            7.26087460
January 1999              73.75047765    July 2001                34.42522680   January 2004             5.93909750
February 1999             72.30744595    August 2001              33.49487120   February 2004            4.63709840
March 1999                70.82605050    September 2001           32.58745995   March 2004               3.35462460
April 1999                69.30890120    October 2001             31.70266145   April 2004               2.21994200
May 1999                  67.75894480    November 2001            30.84014840   May 2004                 1.10240735
June 1999                 66.17951205    December 2001            29.99959775   June 2004                0.00179390
July 1999                 64.57964400    January 2002             29.18069060   July 2004 and
August 1999               62.98716390    February 2002            28.38311225   thereafter               0.00000000
September 1999            61.42688500    March 2002               27.60655190

</TABLE>


<PAGE>



          (c) Notwithstanding the foregoing, on each Distribution Date occurring
on or after the Cross  Over  Date,  the  Class A Non-PO  Principal  Distribution
Amount  will  be  distributed   among  the  remaining   Subclasses  of  Class  A
Certificates  (other than the Class A-PO  Certificates)  pro rata in  accordance
with their  outstanding  Class A Subclass  Principal  Balances without regard to
either the proportions or priorities set forth above.

          (d) (i) For purposes of determining  whether the Subclasses 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 M Fractional  Interest is less than the
          Original Class M Fractional Interest and the Class M Principal Balance
          is greater than zero,  the Class B-1,  Class B-2, Class B-3, Class B-4
          and  Class  B-5   Certificates   shall  not  be  eligible  to  receive
          distributions of principal; or

               (B) 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 and
          Class B-5 Certificates shall not be eligible to receive  distributions
          of principal; or

               (C) 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 and Class B-5
          Certificates  shall  not  be  eligible  to  receive  distributions  of
          principal; or

               (D) 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 and Class B-5 Certificates
          shall not be eligible to receive distributions of principal; or

               (E) 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 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 Class M  Certificates  and/or  the
Subclasses  of  Class  B  Certificates  entitled  to  receive  distributions  of
principal would reduce the Principal Balances of the Class M Certificates and/or
the  Subclasses of Class B  Certificates  entitled to receive  distributions  of
principal below zero, first the Class M Prepayment Percentage and/or the Class B
Subclass  Prepayment  Percentage  of any  affected  Class B  Subclass  for  such
Distribution Date beginning with the affected Subclass with the lowest numerical
Subclass  designation and then, if necessary,  the Class M Percentage and/or the
Class B Subclass  Percentage  of such Subclass of the Class B  Certificates  for
such Distribution Date shall be reduced to the respective  percentages necessary
to bring the Class M  Principal  Balance  and/or the Class B Subclass  Principal
Balance  of such  Class B  Subclass  to zero.  The Class B  Subclass  Prepayment
Percentages  and the  Class B  Subclass  Percentages  of the  remaining  Class B
Subclasses  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 Class M Principal Balance and/or the
Class B Subclass  Principal Balances of the affected Class B Subclasses to zero;
provided,  however,  that if the Class B Subclass  Principal Balances of all the
Class B  Subclasses  eligible to receive  distributions  of  principal  shall be
reduced  to zero on such  Distribution  Date,  the Class B  Subclass  Prepayment
Percentage and the Class B Subclass  Percentage of the Class B Subclass with the
lowest  numerical  Subclass  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 M Prepayment Percentage and the Class B Subclass
Prepayment Percentages of the Class B Subclasses having lower numerical Subclass
designations,  if any, and the remainder of the Subordinated Percentage for such
Distribution  Date  minus  the sum of the  Class M  Percentage  and the  Class B
Subclass  Percentages of the Class B Subclasses having lower numerical  Subclass
designations,  if any, respectively.  Any entitlement of any Class B Subclass to
principal  payments  solely  pursuant  to this  clause (ii) shall not cause such
Subclass to be regarded as being eligible to receive principal distributions for
the purpose of applying the  definition  of its Class B Subclass  Percentage  or
Class B Subclass Prepayment Percentage.

          (e)  The  Trustee  shall   establish   and  maintain  the   Upper-Tier
Certificate  Account,  which shall be a separate  trust  account and an Eligible
Account.  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 available on deposit in the Payment Account,  (i) deposit,
in  immediately  available  funds,  by wire  transfer  or  otherwise,  into  the
Upper-Tier  Certificate  Account  the  Lower-Tier  Distribution  Amount and (ii)
distribute  to the Class  A-LR  Certificateholder  (other  than as  provided  in
Section 9.01 respecting the final distribution to  Certificateholders)  by check
mailed to such Holder at the address of such Holder appearing in the Certificate
Register,  the Class A Subclass  Distribution  Amount with  respect to the Class
A-LR  Certificate  and  all  other  amounts  distributable  to  the  Class  A-LR
Certificate.  The Trustee may clear and  terminate  the  Upper-Tier  Certificate
Account pursuant to Section 9.01.

          (f) 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 (other than the Class A-LR  Certificateholder)
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(f)  respecting the final  distribution  in respect of any Class or
Subclass) 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  11.25,  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 (based
on, with  respect to each Class or Subclass  other than in  connection  with the
distributions   in  reduction  of  the  principal   balance  of  the  Class  A-8
Certificates,   the  aggregate  of  the  Percentage  Interests   represented  by
Certificates of the applicable  Class or Subclass of  Certificates  held by such
Holder  and, in the case of the Class A-8  Certificates,  as provided in Section
4.07) of the Class A Subclass  Distribution Amount with respect to each Subclass
of Class A  Certificates,  the Class M  Distribution  Amount with respect to the
Class M Certificates and the Class B Subclass  Distribution  Amount with respect
to each such Subclass of Class B Certificates.

          In the  event  that,  on any  Distribution  Date  prior  to the  Final
Distribution  Date,  the Class A Subclass  Principal  Balance of any Subclass of
Class A Certificates (other than the Class A-R or A-LR Certificates),  the Class
M  Principal  Balance  of the  Class M  Certificates  or the  Class  B  Subclass
Principal  Balance of any Subclass of Class B  Certificates  would be reduced to
zero or in the case of the Class A-10 Certificates or Class A-WIO  Certificates,
the Class A-10 Notional Amount or Class A-WIO Notional  Amount,  as the case may
be, 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 Trustee. The Trustee will then send a notice to each Certificateholder of
such Class or Subclass with a copy to the Certificate Registrar, specifying that
the final  distribution  with respect to such Class or Subclass  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 Trustee 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)(i).

          (g) 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
Non-U.S.  Persons.  Amounts  withheld  pursuant to this Section 4.01(g) shall be
treated as having  been  distributed  to the related  Certificateholder  for all
purposes of this  Agreement.  For the  purposes of this  paragraph,  a "Non-U.S.
Person" is an individual, corporation,  partnership or other person other than a
citizen or resident of the United States,  a  corporation,  partnership or other
entity  created or  organized  in or under the laws of the United  States or any
political  subdivision  thereof,  an estate  that is  subject  to United  States
federal  income tax regardless of the source of its income or a trust if (i) for
taxable  years  beginning  after  December 31, 1996 (or for taxable years ending
after August 20, 1996, if the trustee has made an applicable election),  a court
within  the  United  States is able to  exercise  primary  supervision  over the
administration of such trust, and one or more United States fiduciaries have the
authority  to control all  substantial  decisions  of such trust or (ii) for all
other taxable  years,  such trust is subject to United States federal income tax
regardless of the source of its income.

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

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

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

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

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

          sixth, to the Class M Certificates until the Class M 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.

          After the Cross-Over  Date, the principal  portion of Realized  Losses
(other than Debt Service Reductions,  Excess Special Hazard Losses, Excess Fraud
Losses and Excess  Bankruptcy  Losses)  allocated to the Class A-11 Certificates
will be borne by the Class  A-12  Certificates  to the  extent  set forth in the
proviso to the third  sentence of the first  paragraph  under the  definition of
Class A Subclass Principal Balance.

          This  allocation  of  Realized  Losses  will be  effected  through the
reduction of the applicable Class's or Subclass'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),  Class M  Certificates  and Class B
Certificates  based on the Class A Non-PO Principal  Balance,  Class M 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  Subclasses of Class A Certificates  (other than the
Class  A-PO   Certificates)  in  accordance  with  the  Class  A  Subclass  Loss
Percentages as of such Determination  Date. Any such loss allocated to the Class
B Certificates  shall be allocated pro rata among the outstanding  Subclasses of
Class B Certificates based on their Class B Subclass Principal Balances.

          (c)  Any  Realized   Losses   allocated  to  a  Subclass  of  Class  A
Certificates or Class B Certificates or to the Class M Certificates  pursuant to
Section 4.02(a) or Section 4.02(b) shall be allocated among the  Certificates of
such Subclass or 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 Subclasses of Class A Certificates,  the Class M Certificates or any
Subclasses of Class B Certificates,  each outstanding Class or Subclass 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),  Class M 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 or Subclass on the  Distribution  Date in the month following the month in
which  such  recovery  is  received.  When the  Principal  Balance of a Class or
Subclass of Certificates  has been reduced to zero, such Class or Subclass 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 or Subclass in accordance with the preceding provisions,  each outstanding
Class  or  Subclass  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 or Subclass.

          (e) The interest portion of Excess Special Hazard Losses, Excess Fraud
Losses and Excess  Bankruptcy  Losses shall be  allocated  among (i) the Class A
Certificates  and the Premium  Payment,  (ii) the Class M Certificates and (iii)
the Class B Certificates, pro rata based on the Senior Accrual Amount, the Class
M  Interest  Accrual  Amount  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  Subclasses  of  Class  A
Certificates  (other than the Class A-PO  Certificates)  and the Premium Payment
based on their Class A Subclass 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  Subclasses of Class B  Certificates  based on
their Class B Subclass  Interest  Percentages.  In  addition,  after the Class M
Principal  Balance and the Class B Principal  Balance have 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  Subclasses of Class A Certificates  (other than the Class
A-PO  Certificates)  and the  Premium  Payment  based on their  Class A Subclass
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.

          (g) With respect to any  Distribution  Date, the principal  portion of
Realized  Losses and recoveries  attributable to previously  allocated  Realized
Losses  allocated  pursuant  to this  Section  4.02  will be  allocated  to each
Uncertificated Lower-Tier Interest in an amount equal to the amount allocated to
its respective Corresponding Upper-Tier Class or Classes, as provided above.

          With  respect  to any  Distribution  Date,  the  interest  portion  of
Realized  Losses  allocated  pursuant to this  Section 4.02 will be allocated to
each  Uncertificated  Lower-Tier  Interest in the same relative  proportions  as
interest is allocated to such Uncertificated Lower-Tier Interest.

Section 4.03.  Paying Agent.

          (a) The Master  Servicer hereby appoints the Trustee 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
Trustee to execute and deliver to the Trustee an instrument in which such Paying
Agent agrees with the Trustee 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 Trustee 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 Trustee,  forthwith  pay to the Trustee 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 Trustee, 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 Trustee and the Seller.

          Concurrently with each distribution  pursuant to Section 4.01(f),  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 Financial
Security a statement setting forth:

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

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

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

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

          (vi) (a) the  amount of such  distribution  to Holders of each Class B
     Subclass  allocable  to  interest,  (b) the amount of the  Current  Class B
     Interest  Distribution  Amount  allocated  to each Class B Subclass and the
     Pass-Through  Rate  applicable to such  Distribution  Date, (c) any Class B
     Subclass   Interest   Shortfall   Amounts  arising  with  respect  to  such
     Distribution  Date  and any  remaining  Class B  Subclass  Unpaid  Interest
     Shortfall with respect to each Class B Subclass after giving effect to such
     distribution,  (d)  the  amount  of any  Non-Supported  Interest  Shortfall
     allocated to each Class B Subclass 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 B  Subclass  for such
     Distribution Date;

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

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

          (ix) the Class A  Principal  Balance,  the Class A Subclass  Principal
     Balance of each  Subclass  of Class A  Certificates,  the Class M Principal
     Balance,  the Class B Principal Balance and the Class B Subclass  Principal
     Balance  of each  Subclass  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;

          (x) 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;

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

          (xii) 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);

          (xiii)  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);

          (xiv) the  Class M  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);

          (xv) the Class M 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);

          (xvi) the Class  B-1,  Class B-2,  Class B-3,  Class B-4 and Class B-5
     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);

          (xvii) the Class B-1,  Class B-2,  Class B-3,  Class B-4 and Class B-5
     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);

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

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

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

          (xxi) 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;

          (xxii)  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;

          (xxiii) the aggregate  amount of Bankruptcy  Losses  allocated to each
     Subclass of Class B Certificates or, following the reduction of the Class B
     Principal Balance to zero, solely to the Class M Certificates in accordance
     with Section 4.02(a) since the Relevant Anniversary;

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

          (xxv) 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;

          (xxvi) 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;

          (xxvii)  in the case of the Class  A-10  Certificate,  the Class  A-10
     Notional Amount;

          (xxviii) in the case of the Class A-8 Certificates,  (a) the Class A-8
     Distribution  Deficiency,  if any, for such Distribution Date, (b) amounts,
     if any in respect of the Class A-8  Distribution  Deficiency paid under the
     Policy and (c) the amounts attributable to the Class A-8 Certificates;

          (xxix) in the case of the Class A-8 Certificates, the amount remaining
     in the Reserve Fund after taking into  account the Reserve  Withdrawal  for
     such Distribution Date;

          (xxx) in the case of the Class  A-WIO  Certificates,  the Class  A-WIO
     Notional  Amount and Class A-WIO  Pass-Through  Rate for such  Distribution
     Date;

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

          (xxxii) 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  Trustee,  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 Subclass of
Class A  Certificates  pursuant to clauses (i) and (ii) above,  with the Class M
Certificates  pursuant  to clauses  (iii) and (iv)  above and with  respect to a
Class B Subclass  pursuant to clauses (v) and (vi) above,  the amounts  shall be
expressed as a dollar amount per Class A, Class M or Class B Certificate  (other
than the  Class  A-WIO,  Class A-R and Class  A-LR  Certificates)  with a $1,000
Denomination, as a dollar amount per Class A-R and Class A-LR Certificate with a
$100  Denomination and as a dollar amount per Class A-WIO  Certificate with a 1%
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, the information set forth in clauses
(iii)  and  (iv)(a)  above  in the case of a Class M  Certificateholder  and the
information  contained in clauses (v) and (vi)(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.

          Prior to the close of business  on the third  Business  Day  preceding
each  Distribution  Date,  the Master  Servicer shall furnish a statement to the
Trustee,  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 Subclass  Distribution Amount with respect to
each Class A Subclass,  the Class M Distribution Amount and the Class B Subclass
Distribution  Amount with respect to each Class B Subclass.  Upon receipt of any
such statement,  the Trustee shall promptly  forward a copy of such statement to
Financial  Security.  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  Trustee  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  M or  Class  B  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
Trustee  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 Trustee 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 $5,000.

          With respect to each Distribution  Date, the Reserve  Withdrawal shall
be  withdrawn  by the Trustee  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-8  Certificates,  pro  rata,  based on  Percentage
Interest.

          Notwithstanding  anything herein to the contrary,  on the Distribution
Date  on  which  the  Class  A  Subclass  Principal  Balance  of the  Class  A-8
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 Trustee.

          (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 Upper-Tier REMIC, the Lower-Tier REMIC
or the Trust Estate.

Section 4.07.  Distributions in Reduction of the Class A-8 Certificates.

          Distributions in reduction of the Class A Subclass  Principal  Balance
of the Class A-8  Certificates  will be made in integral  multiples of $1,000 at
the  request of the  appropriate  representatives  of  Deceased  Holders of such
Subclass and at the request of Living  Holders of such  Subclass 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 Subclass  Principal  Balance of the Class A-8 Certificates are made,
such  distributions  will be made with respect to such Subclass 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 Subclass of $100,000 per request; and

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

          Thereafter, distributions will be made, with respect to such Subclass,
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 Subclass made by the Beneficial Owners of the
Class A-8 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-8 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-8  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  Subclass
presented  in  accordance  with clause (i) have been  honored.  All requests for
distributions  in  reduction  of  the  principal   balances  of  the  Class  A-8
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-8 Certificates  with respect to any Distribution Date must be
received by the Clearing  Agency and  forwarded to, and received by, the Trustee
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 Trustee 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-8  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-8
Certificate,  all in accordance  with the procedures of the Clearing  Agency and
the  Trustee.  Upon the  transfer  of  beneficial  ownership  of any  Class  A-8
Certificate,  any distribution request previously submitted with respect to such
Certificate  will be deemed to have been  withdrawn only upon the receipt by the
Trustee of notification of such withdrawal using a form required by the Clearing
Agency.

          Distributions in reduction of the principal  balances of the Class A-8
Certificates will be applied, in the aggregate with respect to such Subclass, in
an amount equal to the Class A Non-PO Principal Distribution Amount allocable to
such  Subclass  pursuant to Section  4.01(b),  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 Subclass
established  as  provided  in  Section  4.07(e),  provided  that  the  aggregate
distribution  in  reduction  of the Class A Subclass  Principal  Balance of such
Subclass 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
Subclass  Principal  Balance of the Class A-8  Certificates on any  Distribution
Date (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-8 Certificates with respect to which distribution
requests,  as set forth above, have been received  distributions in reduction of
the Class A Subclass  Principal  Balance of the Class A-8  Certificates  will be
made by mandatory distribution pursuant to Section 4.07(d).

          (b) A Class A-8  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-8 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-8 Certificates so beneficially  owned will be
eligible  for  priority  with  respect  to  distributions  in  reduction  of the
principal  balance of such Subclass thereof,  subject to the limitations  stated
above.  Class A-8 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-8  Certificates  greater than the number of Individual Class
A-8 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-8
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-8 Certificates
will be  deemed  to be the  death  of the  Beneficial  Owner of such  Class  A-8
Certificates  regardless of the  registration  of ownership,  if such beneficial
interest can be established to the satisfaction of the Trustee.  Such beneficial
interest  will be deemed to exist in  typical  cases of street  name or  nominee
ownership,  ownership by a trustee,  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-8  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-8 Certificates  payable with respect thereto.
The  Trustee  shall  not be  under  any  duty  to  determine  independently  the
occurrence of the death of any deceased  Beneficial  Owner. The Trustee 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-8 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-8
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 Trustee 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) on a form
required by the Clearing Agency 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  Trustee.  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  Trustee  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  Trustee  shall   maintain  a  list  of  those   Clearing   Agency
Participants  representing  the  appropriate  Beneficial  Owners  of  Class  A-8
Certificates that have submitted  requests for distributions in reduction of the
principal  balance of Certificates of such Subclass,  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 Trustee 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  Trustee  and  the  Clearing  Agency  for  purposes  of
determining such priorities and limitations will be those  established from time
to time by the Trustee or the Clearing Agency, as the case may be. The decisions
of the Trustee and the Clearing Agency concerning such matters will be final and
binding on all affected persons.

          Individual  Class A-8  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 Financial Security
or otherwise with respect to interest on such  Certificates  after such last day
of the month.

          Any Beneficial Owner of a Class A-8 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 Trustee.  If such notice of withdrawal of a request for distribution has not
been  received by the Clearing  Agency and forwarded to the Trustee 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 Subclass Principal Balance of Class A-8 Certificates on
such Distribution Date.

          In the  event any  requests  for  distributions  in  reduction  of the
principal  balance of Class A-8  Certificates  are  rejected  by the Trustee for
failure to comply with the  requirements of this Section 4.07, the Trustee 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 Subclass  Principal  Balance of Class A-8 Certificates on a Distribution
Date exceed the outstanding  principal balances of Certificates of such Subclass
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 Subclass  Principal  Balance of the Class A-8  Certificates  will be
made  by  mandatory   distributions   in  reduction   thereof.   Such  mandatory
distributions on Individual Class A-8 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 Subclass Principal Balance of
the Class A-8  Certificates  on the next succeeding  Distribution  Date on which
mandatory  distributions  are to be made,  the  principal  balance  of Class A-8
Certificates would not be reduced to zero, the Individual Class A-8 Certificates
to which such  distributions  will be applied  shall be selected by the Clearing
Agency from those Class A-8 Certificates not otherwise  receiving  distributions
in reduction of the principal  balance on such  Distribution  Date.  The Trustee
shall  notify  the  Clearing  Agency of the  aggregate  amount of the  mandatory
distribution in reduction of the Class A Subclass Principal Balance of the Class
A-8 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-8  Certificates  from among those
held in its  accounts to receive  mandatory  distributions  in  reduction of the
principal  balance of the  Certificates  of such  Subclass,  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-8 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  Trustee  of the amount of
distributions  in reduction of the principal  balances of Class A-8 Certificates
to be made on each  Distribution  Date in a timely  manner such that the Trustee
may fulfill its obligations pursuant to the Letter of Representations  dated the
Business  Day  immediately  preceding  the Closing  Date among the  Seller,  the
Trustee and the Clearing Agency.

          (e) On the Closing Date,  the Rounding  Account  shall be  established
with the Trustee and the Seller shall cause to be initially  deposited  with the
Trustee 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-8 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 Subclass  Principal  Balance to be made
on the Class A-8  Certificates.  Rounding of such  distribution on the Class A-8
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-8  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-8  Certificates  are to be
made,  the  aggregate  amount of such  distributions  allocable to the Class A-8
Certificates  shall be  applied  first to repay  any  funds  withdrawn  from the
Rounding Account on the prior  Distribution Date, 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-8
Certificates; this process shall continue on succeeding Distribution Dates until
the Class A Subclass  Principal  Balance of the Class A-8  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  Subclass  Principal
Balance of the Class A-8 Certificates will reduce the Class A Subclass Principal
Balance thereof to zero or in the event that  distributions  in reduction of the
Class A Subclass  Principal  Balance of the Class A-8  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-LR Certificate.

          (f)  Notwithstanding  any provisions  herein to the contrary,  on each
Distribution  Date following the first  Distribution Date on which any principal
losses are allocated to the Class A-8  Certificateholders  occurring on or after
the earliest to occur of (i) the Cross-Over Date, (ii) the date on which Special
Hazard  Losses  exceed the Special  Hazard Loss Amount,  (iii) the date on which
Fraud Losses exceed the Fraud Loss Amount and (iv) the date on which  Bankruptcy
Losses  exceed the  Bankruptcy  Loss Amount,  distributions  in reduction of the
principal  balance  of the Class A-8  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-8  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 Definitive  Certificates  representing the Class
A-8  Certificates  are issued  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  distributions  in
reduction  of the  principal  balances of the Class A-8  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-8
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
Trustee  determines that there will be a Class A-8  Distribution  Deficiency for
such Distribution Date, the Trustee shall determine the amount of such Class A-8
Distribution  Deficiency  and shall give notice to  Financial  Security  and the
Fiscal Agent, if any (as defined in the Policy), by telephone or telecopy of the
amount of such  deficiency  confirmed in writing by the Notice of Claim 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
Trustee shall establish a separate  special purpose trust account in the name of
the Trustee for the benefit of Holders of the Class A-8 Certificates referred to
herein as the  "Policy  Payments  Account"  over  which the  Trustee  shall have
exclusive  control and sole right of  withdrawal.  The Trustee 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-8
Certificates of the Class A-8 Distribution Deficiency for which a claim was made
and  such  amounts  may  not be  applied  to  satisfy  any  costs,  expenses  or
liabilities  of the Trustee or the Trust  Estate.  Amounts paid under the Policy
shall be  disbursed by the Trustee to Holders of the Class A-8  Certificates  in
the same manner as  distributions  in reduction of the principal  balance of and
interest on the Certificates of such Subclass are made under Section 4.01(e). It
shall  not be  necessary  for  such  payments  of  the  Class  A-8  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-8  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-8
Certificates and Financial  Security pursuant to Section 4.04. Funds held in the
Policy Payments Account shall not be invested by the Trustee.

          On any  Distribution  Date with respect to which a claim has been made
under the Policy, the amount of any funds received by the Trustee as a result of
the claim under the Policy to the extent necessary to make  distributions on the
Class A-8 Certificates  equal to the Class A-8  Distribution  Deficiency on such
Distribution  Date shall be  withdrawn  from the  Policy  Payments  Account  and
applied  by the  Trustee to the  payment  in full of the Class A-8  Distribution
Deficiency.  Any funds deposited into the Policy Payments  Account in respect of
the Class A-8 Certificates  that are remaining therein on the first Business Day
following a Distribution  Date after the Class A-8  Distribution  Deficiency has
been  made to the  Certificateholders  of such  Subclass  shall be  remitted  in
immediately available funds to Financial Security,  pursuant to the instructions
of Financial Security, by the end of such Business Day.

          (c) The Trustee shall keep a complete and accurate record of the Class
A-8  Interest  Loss  Amount,  the  Class  A-8  Principal  Loss  Amount  and  any
Non-Supported  Interest  Shortfall  allocated to the Class A-8 Certificates once
the Reserve Fund has been depleted,  paid from moneys received under the Policy.
Financial  Security  shall have the right to inspect such records at  reasonable
times upon one Business Day's prior notice to the Trustee.

          (d) In the event that the Trustee 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-8 Certificate has been avoided in
whole or in part as a preference  payment under  applicable  bankruptcy law, the
Trustee shall so notify  Financial  Security and the Fiscal Agent (as defined in
the  applicable  Policy),  if any,  shall  comply  with  the  provisions  of the
applicable  Policy to obtain  payment  by  Financial  Security  of such  avoided
distribution,  and shall, at the time it provides notice to Financial  Security,
notify,  by mail to Holders of the  Certificates  of such Subclass  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 Trustee and the Trustee  shall  furnish to
Financial  Security and the Fiscal  Agent,  if any, 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-8  Certificates,  if any, which have been made by the Trustee 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 trustee in bankruptcy  named in the order
and not to the Trustee or any Class A-8 Certificateholder  directly (unless such
Certificateholder has previously paid such amount to the receiver,  conservator,
debtor-in-possession  or trustee in bankruptcy named in the order, in which case
such  payment  shall  be  disbursed  to the  Trustee  for  distribution  to such
Certificateholder  upon  proof  of  such  payment  reasonably   satisfactory  to
Financial Security).

          (e) The Trustee  shall  promptly  notify  Financial  Security  and the
Fiscal Agent, if any, 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-8 Certificates as to which it has
actual  knowledge.  Each Holder of a Class A-8  Certificate,  by its purchase of
such Certificates and the Trustee hereby agree that Financial  Security (so long
as no Financial Security 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,  Financial Security shall be subrogated to
the rights of the  Trustee  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  Trustee  acknowledges,  and  each  Holder  of  a  Class  A-8
Certificate  by its  acceptance  of such  Certificate  agrees,  that without any
further action on the part of Financial  Security,  Financial  Security shall be
subrogated   to  all  of  the   rights   to   amounts   distributable   to  such
Certificateholders  in respect of Class A Subclass Unpaid  Interest  Shortfalls,
Non-Supported Interest Shortfalls allocated to such Certificates and recoveries,
if any,  with  respect to the Class A-8  Principal  Loss Amounts with respect to
amounts paid under the Policy. The Class A-8 Certificateholders by acceptance of
such  Certificates  assign  their  rights as  Holders  of such  Certificates  to
Financial Security to the extent of Financial  Security's  interest with respect
to amounts paid.

          (g) The Master Servicer shall designate a Financial  Security  Contact
Person who shall be available to Financial Security to provide reasonable access
to information  regarding the Mortgage  Loans.  The initial  Financial  Security
Contact Person is appointed in Section 11.29.

          (h) The Trustee shall  surrender the Policy to Financial  Security for
cancellation  upon the  expiration  of the term of the Policy as provided in the
Policy.

          (i) The Trustee upon receipt  from the Master  Servicer  shall send to
Financial  Security  the  report  prepared  pursuant  to  Section  3.05  and the
statements prepared pursuant to Section 4.04.

<PAGE>

                                    ARTICLE V

                                THE CERTIFICATES

Section 5.01.  The Certificates.

          (a) The Class A, Class M and Class B Certificates shall be issued only
in minimum  Denominations of a Single Certificate and, except for the Class A-9,
Class A-10, Class A-R and Class A-LR Certificates,  integral multiples of $1,000
(or 1%  Percentage  Interest  in the case of the Class  A-WIO  Certificates)  in
excess  thereof  (except,  if necessary,  for one  Certificate  of each Class or
Subclass (other than the Class A-9, Class A-10, Class A-WIO, Class A-R and Class
A-LR  Certificates)  that evidences one Single  Certificate plus such additional
principal  portion as is required in order for all Certificates of such Class or
Subclass to equal the aggregate  Original  Class A Subclass  Principal  Balance,
Original  Class M Principal  Balance or the aggregate  Original Class B Subclass
Principal  Balance of such Class or Subclass,  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-5, A-6, A-7, A-8, A-9, A-10,  A-11, A-12,  A-PO,  A-WIO,  A-R, A-LR, B-1, B-2,
B-3, B-4, B-5, C, and  D  (reverse  side  of  Certificates)  hereto. On original
issue, the  Certificates  shall be  executed  and delivered by the Trustee to or
upon the order  of the  Seller upon  receipt  by the  Trustee  or the  Custodian
of the documents  specified  in  Section 2.01. The  aggregate  principal portion
evidenced by the Class A, Class M 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  Trustee  by any Responsible  Officer   thereof.  Certificates  bearing  the
manual or  facsimile signatures  of individuals who were at any time the  proper
officers  of the  Trustee  shall  bind  the  Trustee  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 Trustee, 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  Trustee  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 Trustee may deal with the Clearing  Agency for all purposes  (including
     the making of distributions  on the Book-Entry  Certificates and the taking
     of actions by the Holders of  Book-Entry  Certificates)  as the  authorized
     representative of the Beneficial Owners;

          (iii)  to the  extent  that the  provisions  of this  Section  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 Trustee at the Corporate Trust Office.

Section 5.02.  Registration of Certificates.

          (a) The  Trustee  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 Trustee shall provide for the registration of Certificates and of
transfers and exchanges of  Certificates as herein  provided.  The Trustee 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 Trustee 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 or Subclass.

          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 or Subclass upon surrender
of the  Certificates to be exchanged at any such office or agency.  Whenever any
Certificates  are so surrendered  for exchange,  the Trustee 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 Trustee) 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 Trustee 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 Trustee or the Authenticating Agent
in accordance with their standard procedures.

          (b) No transfer of a Class A-WIO, Class M, Class B-1, Class B-2, Class
B-3, Class B-4 or Class B-5  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 Trustee 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-WIO,  Class M, Class B-1,  Class B-2, Class B-3,
Class B-4 or Class B-5 Certificateholder to deliver a written Opinion of Counsel
acceptable  to and in form and  substance  satisfactory  to the  Trustee 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 Trustee,  the Seller or the Master Servicer,  and
(ii) the  Trustee  shall  require  the  transferee  (other than of a Class A-WIO
Certificate  where  such  transferee  is an  affiliate  of the  Seller  and such
transfer is made on the  Closing  Date) to execute an  investment  letter in the
form of Exhibit J hereto  certifying  to the Seller  and the  Trustee  the facts
surrounding such transfer,  which  investment  letter shall not be an expense of
the  Trustee,  the Seller or the Master  Servicer.  The Holder of a Class A-WIO,
Class M, Class B-1,  Class B-2,  Class B-3,  Class B-4 or Class B-5  Certificate
desiring to effect such transfer shall,  and does hereby agree to, indemnify 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 Trustee is under an  obligation  to register the Class A-WIO,
Class M, Class B-1, Class B-2,  Class B-3,  Class B-4 or Class B-5  Certificates
under said Act or any other securities law.

          (c) No  transfer  of a  Class  A-WIO  Certificates  (other  than to an
affiliate of the Seller on the Closing  Date) or Class A-12,  Class M or Class B
Certificate  shall  be  made  unless  the  Trustee  shall  have  received  (i) a
representation  letter from the  transferee in the form of Exhibit J hereto,  in
the case of a Class A-WIO,  Class M, Class B-1,  Class B-2, Class B-3, Class B-4
or Class B-5 Certificate,  or in the form of Exhibit K hereto,  in the case of a
Class A-12 Certificate,  to the effect that either (a) such transferee is not an
employee benefit plan or other retirement  arrangement  subject to the fiduciary
responsibility provisions of ERISA or Code Section 4975, or a governmental plan,
as defined in Section 3(32) of ERISA, or subject to any federal,  state or local
law  ("Similar  Law")  which is to a material  extent  similar to the  foregoing
provisions  of ERISA or the Code  (collectively,  a "Plan")  and is not a person
acting  on  behalf  of  or  investing  the  assets  of  any  such  Plan,   which
representation  letter shall not be an expense of the Trustee, the Seller or the
Master Servicer or (b) (other than with respect to a Class A-WIO Certificate) if
such  transferee is an insurance  company,  the source of funds used to purchase
the Class A-12, Class M or 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)) and
there is no Plan with  respect  to which the  amount of such  general  account's
reserves and liabilities  for the contract(s)  held by or on behalf of such Plan
and all other Plans  maintained by the same  employer (or  affiliate  thereof as
defined in Section  V(a)(1) of PTE 95-60) or by the same  employee  organization
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 or (ii) in the case of any such Class A-12, Class A-WIO,  Class M 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 Trustee
and the Seller to the effect  that the  purchase  or holding of such Class A-12,
Class A-WIO, Class M 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 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  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
Trustee, the Seller or the Master Servicer.  Each Class A-12, Class A-WIO, Class
M and  Class B  Certificate  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 or Class A-LR  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 or Class
A-LR  Certificate in connection  with the conduct of a trade or business  within
the United  States and has  furnished  the  transferor  and the Trustee  with an
effective Internal Revenue Service Form 4224 or (iii) is a Non-U.S.  Person that
has delivered to both the  transferor and the Trustee an opinion of a nationally
recognized tax counsel to the effect that the transfer of the Class A-R or Class
A-LR  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
or Class  A-LR  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  Trustee  shall not
execute,  and shall not  authenticate  (or  cause  the  Authenticating  Agent to
authenticate)  and  deliver,  a new  Class  A-R or  Class  A-LR  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
Trustee shall accept a surrender for transfer or  registration  of transfer,  or
register the transfer  of, the Class A-R or Class A-LR  Certificate,  unless the
transferor shall have provided to the Trustee 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 or
Class A-LR 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 or Class A-LR  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 or Class A-LR 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 and Class  A-LR  Certificates
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 or Class A-LR  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 or Class A-LR Certificate in constructive  trust for the last transferor who
was not a disqualified  organization or agent thereof, and such transferor shall
be  restored  as the  owner of such  Class  A-R or  Class  A-LR  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 Class A-R or Class A-LR  Certificate,  and (ii) the
Master  Servicer  agrees to furnish to the Internal  Revenue  Service and to any
transferor of the Class A-R or Class A-LR  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 or Class A-LR  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 Trustee or the
Authenticating  Agent,  or the  Trustee  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 Trustee 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 Trustee or the  Authenticating
Agent that such  Certificate  has been  acquired by a bona fide  purchaser,  the
Trustee 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 or Subclass. Upon
the  issuance  of any new  Certificate  under this  Section,  the Trustee 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  Trustee  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  Certificate
Registrar and any agent of the Seller,  the Master Servicer,  the Trustee 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  Certificate
Registrar nor any agent of the Seller,  the Master Servicer,  the Trustee 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  Trustee  is  not  acting  as  Certificate  Registrar,  the
Certificate  Registrar  shall  furnish or cause to be  furnished to the Trustee,
within 15 days after  receipt by the  Certificate  Registrar of a request by the
Trustee in writing, a list, in such form as the Trustee may reasonably  require,
of the names and addresses of the  Certificateholders  of each Class or Subclass
as of the most recent Record Date.

          (b) If five or more  Certificateholders  (hereinafter  referred  to as
"applicants") apply in writing to the Trustee,  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 Trustee  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
Trustee. 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  Trustee  is not the  Certificate
Registrar,  the Trustee 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 and the
Trustee that neither the Seller, the Master Servicer,  the Certificate Registrar
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 Trustee 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 Trustee 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 Trustee 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 Trustee in writing that it elects to
terminate the book-entry  system through the Clearing  Agency or (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 Subclass of Book-Entry  Certificates advise
the Trustee  through the Clearing  Agency and Clearing  Agency  Participants  in
writing that the continuation of a book-entry system through the Clearing Agency
is no longer in the best interests of the Beneficial  Owners,  the Trustee 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 Trustee 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 Trustee  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 nor the Trustee
shall be liable for any delay in delivery of such  instructions  by the Clearing
Agency and may conclusively  rely on, and shall be protected in relying on, such
instructions.

Section 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  Trustee  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, Class M 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,  a
copy of which shall be delivered,  but not addressed,  to Financial Security. No
such  resignation  shall  become  effective  until the  Trustee  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 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 (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,  in the exercise of its reasonable  judgment,  and
executes  and  delivers  to the  Trustee  an  agreement,  in form and  substance
reasonably  satisfactory  to the Trustee,  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-10  Certificates,
giving  effect to the  guaranty  provided by  Financial  Security);  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 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 and Seller by Master Servicer.

          The Master  Servicer shall indemnify and hold harmless the Trustee 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 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.
<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  FHMLC,  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 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 Trustee pursuant
to and under this  Section,  subject to the  provisions  of Section  7.05;  and,
without  limitation,  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 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  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 trusts 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  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  may,  but  need  not if the  Trustee  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,  the Trustee 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.  Trustee to Act; Appointment of Successor.

          When the Master Servicer  receives  notice of termination  pursuant to
Section 7.01 or the Trustee  receives  the  resignation  of the Master  Servicer
evidenced by an Opinion of Counsel  pursuant to Section 6.04,  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  Trustee is  succeeding  to the Master
Servicer as the Master Servicer, as compensation  therefor, the Trustee 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
Trustee 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 Trustee 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
Trustee  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
Trustee is  required  to solicit  bids as  provided  above,  the  Trustee  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 Trustee  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 Trustee  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 Trustee 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  Trustee  to the Master  Servicer  at the time of such  sale,  transfer  and
assignment to the Master  Servicer's  successor.  The Trustee 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
Trustee and any successor  servicer in effecting the  termination  of the Master
Servicer's  servicing  responsibilities  and rights hereunder and shall promptly
provide  the Trustee 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
Trustee 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 Trustee 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 Trustee)  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-10 Certificates, giving
effect to the guaranty  provided by Financial  Security) 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 Trustee shall
give prompt written notice thereof to Financial Security and  Certificateholders
at their respective addresses appearing in the Certificate Register. The Trustee
shall also, within 45 days after the occurrence of any Event of Default known to
the  Trustee,   give   written   notice   thereof  to  Financial   Security  and
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

Section 8.01.  Duties of Trustee.

          The Trustee,  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,  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,   upon  receipt  of  all   resolutions,   certificates,
statements,  opinions, reports, documents, orders or other instruments furnished
to the Trustee 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 shall
not be responsible  for the accuracy or content of any  certificate,  statement,
instrument, report, notice or other document furnished by the Servicers pursuant
to Articles III, IV and IX.

          No  provision  of this  Agreement  shall be  construed  to relieve the
Trustee from liability for its own negligent  action,  its own negligent failure
to act or its own 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 shall be determined  solely by the express
     provisions  of this  Agreement,  the Trustee shall not be liable except for
     the  performance  of such duties and  obligations as are  specifically  set
     forth in this Agreement,  no implied covenants or obligations shall be read
     into this Agreement against the Trustee and, in the absence of bad faith on
     the part of the Trustee, the Trustee may conclusively rely, as to the truth
     of the statements and the  correctness of the opinions  expressed  therein,
     upon any  certificates or opinions  furnished to the Trustee and conforming
     to the requirements of this Agreement;

          (ii) The Trustee  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, or exercising any trust
     or power conferred upon the Trustee under this Agreement; and

          (iii) the Trustee  shall not be liable for any error of judgment  made
     in good faith by any of its Responsible Officers, unless it shall be proved
     that the Trustee or such Responsible  Officer was negligent in ascertaining
     the pertinent facts.

          None of the provisions  contained in this Agreement  shall require the
Trustee or 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.

          Except as otherwise provided in Section 8.01:

          (i) The  Trustee  may  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;

          (ii) The Trustee may consult with counsel,  and 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) The Trustee shall not 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; and

          (iv) The Trustee may execute any of the trusts or powers  hereunder or
     perform any duties  hereunder  either  directly or by or through  agents or
     attorneys.

Section 8.03.  Trustee Not 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,  the Trustee shall not
be bound to make any  investigation  into the  facts or  matters  stated  in any
resolution,   certificate,   statement,  instrument,  opinion,  report,  notice,
request, consent, order, 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 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,  not reasonably  assured to the
Trustee  by the  security  afforded  to it by the terms of this  Agreement,  the
Trustee 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, shall be repaid
by the Master Servicer upon demand.

Section 8.04.  Trustee Not 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  Trustee  assumes no  responsibility  as to the
correctness of the same. The Trustee makes no representation for the correctness
of  the  same.  The  Trustee  makes  no  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, the Trustee shall not 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 May Own Certificates.

          The  Trustee 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 or such agent.

Section 8.06.  The Master Servicer to Pay Fees and Expenses.

          The Master  Servicer  covenants  and agrees to pay to the Trustee from
time to  time,  and  the  Trustee  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 and the
Master  Servicer  will pay or  reimburse  the  Trustee  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.

          The  Trustee  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 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.

          The Trustee 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.
Upon receiving such notice of  resignation,  the Master  Servicer shall promptly
appoint a successor  trustee 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 shall have been appointed and have accepted
appointment  within 30 days after the giving of such notice of resignation,  the
resigning  Trustee may  petition  any court of  competent  jurisdiction  for the
appointment of a successor trustee.

          If at any time the Trustee  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 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 of the property or
affairs  of the  Trustee  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 appoint a successor trustee by written  instrument,
in duplicate,  one copy of which instrument shall be delivered to the Trustee so
removed and one copy to the successor trustee.

          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 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  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  appointed  as provided in Section  8.08 shall
execute,  acknowledge  and deliver to the Master Servicer and to its predecessor
trustee an instrument  accepting such appointment  hereunder,  and thereupon the
resignation or removal of the predecessor  trustee shall become  effective,  and
such  successor,  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
herein.  The  predecessor  trustee  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 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
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,  the successor trustee shall
cause such notice to be mailed at the expense of the Master Servicer.

Section 8.10.  Merger or Consolidation.

          Any Person into which the Trustee 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 shall be a party,  or any Person  succeeding to the business of such
entity, shall be the successor of the Trustee 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  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  either the  Upper-Tier  REMIC or the  Lower-Tier  REMIC to federal,
state or local tax or cause either the Upper-Tier  REMIC or the Lower-Tier REMIC
to fail to qualify  as a REMIC,  which  Opinion of Counsel  shall be at the sole
expense of the Trustee.

Section 8.11.  Authenticating Agent.

          The  Trustee  may  appoint an  Authenticating  Agent,  which  shall be
authorized  to act on  behalf of the  Trustee  in  authenticating  Certificates.
Wherever   reference  is  made  in  this  Agreement  to  the  authentication  of
Certificates  by the Trustee or the Trustee's  countersignature,  such reference
shall be deemed to  include  authentication  on  behalf  of the  Trustee  by the
Authenticating  Agent and a certificate of authentication  executed on behalf of
the  Trustee  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 Trustee
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 Seller and the
Master  Servicer.  The  Trustee  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 Trustee  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 Trustee.  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  Trustee 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 Trustee,
by entering  into a  Custodial  Agreement.  Subject to this  Article  VIII,  the
Trustee  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 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 two
separate  REMICs;  or (ii) cause the  imposition of any federal,  state or local
income,  prohibited  transaction,  contribution  or  other  tax  on  either  the
Upper-Tier REMIC, the Lower-Tier REMIC or the Trust Estate. The Master Servicer,
or, in the case of the  execution of any action  required by law to be performed
directly by the Trustee, the Trustee, 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  for each of the
Upper-Tier  REMIC and the Lower-Tier  REMIC using a calendar year as the taxable
year and the accrual  method of  accounting;  (ii) in the first such federal tax
returns, make, or cause to be made, elections satisfying the requirements of the
REMIC Provisions, on behalf of the Trust Estate, to treat each of the Upper-Tier
REMIC and the Lower-Tier REMIC 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 Trust Estate, 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  Trustee  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
Upper-Tier  REMIC and the  Lower-Tier  REMIC,  including  but not limited to the
income, expenses, individual Mortgage Loans (including REO Mortgage Loans, other
assets and  liabilities  of each REMIC,  and the fair market  value and adjusted
basis of the  property  of each REMIC  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 either the Upper-Tier  REMIC or the Lower-Tier  REMIC within
the  meaning  of  Code  Section  860D(a)(2)  other  than  the  interests  in the
Upper-Tier REMIC  represented by the Class A-1, Class A-2, Class A-3, Class A-4,
Class A-5, Class A-6,  Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11,
Class A-12,  Class A-PO,  Class  A-WIO and Class A-R  Certificates,  the Class M
Certificates  and the Class B-l,  Class B-2,  Class B-3, Class B-4 and Class B-5
Certificates and the interests in the Lower-Tier REMIC  represented by the Class
A-L1, Class A-L2, Class A-L8, Class A-L9, Class AP-L, Class AIO-L,  Class A-LUR,
Class  B-L1,  Class  B-L2,  Class  B-L3,  Class  B-L4,  Class B-L5 and Class M-L
Interests and the Class A-LR Certificate; (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 Upper-Tier  REMIC or Lower-Tier REMIC or
the Trust  Estate to tax or (c) cause the Trust Estate to fail to qualify as two
separate  REMICs;  (ix)  exercise  reasonable  care  not  to  allow  either  the
Upper-Tier  REMIC or the Lower-Tier 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 Upper-Tier REMIC or the Lower-Tier  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
Upper-Tier  REMIC or Lower-Tier  REMIC, as the case may be, 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  Upper-Tier  REMIC or the
Lower-Tier 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 and Class
A-LR  Certificateholders  for such purpose (or if the Master  Servicer is not so
permitted, the Holders of the Class A-R and Class A-LR Certificates shall be tax
matters  persons 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 shall sign the tax returns  referred to in clause (i) of
the second preceding sentence.

          In order to enable the Master Servicer 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 and Subclass of Certificates and the Mortgage
Loans in the  aggregate.  Thereafter,  the  Seller  shall  provide to the Master
Servicer or the Trustee, as the case may be, promptly upon request therefor, any
such additional  information or data that the Master Servicer 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 and the Trustee for any losses, liabilities, damages, claims
or expenses of the Master  Servicer  or the Trustee  arising  from any errors or
miscalculations  by the Master Servicer 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 or the Trustee, as
the case may be, on a timely basis.  The Master Servicer hereby  indemnifies the
Seller and the Trustee for any losses, liabilities,  damages, claims or expenses
of the  Seller  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  Trustee  prepares  any of the  federal,  state and local tax returns of the
REMIC as described  above,  the Trustee  hereby  indemnifies  the Seller and the
Master Servicer for any losses, liabilities,  damages, claims or expenses of the
Seller or the Master Servicer  arising from the Trustee'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 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 or the Trustee to 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  Trustee  shall make a Periodic  Advance as required by
Section 3.03 hereof;  provided,  however,  the Trustee  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 Trustee
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.


<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  and the Trustee  created
hereby (other than the obligation of the Trustee 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 Trustee 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 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 11.24. In the case of any purchase by the Seller pursuant to said clause
(i),  the Seller  shall  provide to the  Trustee the  certification  required by
Section 3.04 and the Trustee 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 Trustee 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   Trustee   (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  Trustee  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 Trustee therein specified. If
the  Master  Servicer  is  obligated  to give  notice to  Certificateholders  as
aforesaid,  it  shall  give  such  notice  to the  Trustee  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 Trustee 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  Subclasses  of  Class A  Certificates,  the  respective  Class  A  Subclass
Principal  Balance  together with any related Class A Subclass  Unpaid  Interest
Shortfall and one month's  interest in an amount equal to the respective Class A
Subclass Interest Accrual Amount, (ii) as to the Class M Certificates, the Class
M Principal Balance together with any related Class M Unpaid Interest  Shortfall
and one  month's  interest  at the  Class  M  Pass-Through  Rate on the  Class M
Principal  Balance,  (iii) as to the  Subclasses  of Class B  Certificates,  the
respective Class B Subclass  Principal Balance together with any related Class B
Subclass Unpaid Interest  Shortfall and one month's  interest in an amount equal
to the respective  Class B Subclass  Interest  Accrual Amount and (iv) as to the
Class A-R and Class A-LR  Certificates,  the  amounts,  if any,  which remain on
deposit in the  Upper-Tier  Certificate  Account  and the  Certificate  Account,
respectively  (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.  Such
amount shall be  distributed  in respect of interest and principal in respect of
the  Uncertificated  Lower-Tier  Interests in the same amounts as distributed to
their  Corresponding  Upper-Tier  Class or Classes in the  manner  specified  in
Section 4.01(a)(ii).  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 Trustee 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 Trustee 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 Trustee (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 Trustee 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  Trustee  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  either the Upper-Tier  REMIC or the Lower-Tier  REMIC to federal tax or
cause the Trust  Estate to fail to  qualify as two  separate  REMICs 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 Upper-Tier  REMIC and Lower-Tier 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  returns of the  Upper-Tier
     REMIC and Lower-Tier 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 Trustee
     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 and the  Trustee,  and with respect
only to amendments  affecting the rights or obligations  of Financial  Security,
with the  consent  of  Financial  Security,  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 two separate  REMICs 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,  the Upper-Tier  REMIC or the Lower-Tier
REMIC  pursuant  to the Code that  would be a claim  against  the Trust  Estate,
provided  that (a) the Trustee has  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  Upper-Tier  Certificate  Account and
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-8
Certificates, giving effect to the guaranty provided by Financial Security), (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
Upper-Tier REMIC or the Lower-Tier 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 and the Trustee with the consent
of Financial  Security (only with respect to amendments  affecting the rights or
obligations of Financial Security) and the Holders of Certificates evidencing in
the aggregate not less than 66 2/3% of the  aggregate  Voting  Interests of each
Class or Subclass 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 or  Subclass;  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 or  Subclass  in a manner  other than as
described in clause (i) hereof without the consent of Holders of Certificates of
such  Class  or  Subclass  evidencing,  as to such  Class  or  Subclass,  Voting
Interests  aggregating  not less than  66 2/3%  or (iii)  reduce  the  aforesaid
percentage  of  Certificates  of any Class or Subclass  the Holders of which are
required to consent to any such amendment, without the consent of the Holders of
all Certificates of such Class or Subclass then outstanding.

          Notwithstanding any contrary provision of this Agreement,  the Trustee
shall not consent to any amendment to this Agreement  unless it shall have first
received  an  Opinion of Counsel  to the  effect  that such  amendment  will not
subject  either the  Upper-Tier  REMIC or the  Lower-Tier  REMIC to tax or cause
either  the  Upper-Tier  REMIC or the  Lower-Tier  REMIC 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  Trustee  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 Trustee 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 Trustee or Financial Security;  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:

          (a)  changing the Applicable  Unscheduled Principal Receipt Period for
               Exhibit F-1  Mortgage  Loans to a Mid-Month  Receipt  Period with
               respect to all Unscheduled Principal Receipts; or

          (b)  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 Trustee.

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 Trustee,  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 Trustee 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 Trustee
to  institute  such  action,  suit  or  proceeding  in its own  name as  Trustee
hereunder and shall have offered to the Trustee such reasonable  indemnity as it
may require against the cost, expenses and liabilities to be incurred therein or
thereby, and the Trustee, for 60 days after its receipt of such notice,  request
and offer of  indemnity,  shall have  neglected or refused to institute any such
action,  suit or  proceeding;  it  being  understood  and  intended,  and  being
expressly    covenanted   by   each    Certificateholder    with   every   other
Certificateholder  and the Trustee,  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  Trustee  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 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, or such other address
as may  hereafter be furnished to the Seller and the Master  Servicer in writing
by the Trustee,  in each case Attention:  Corporate Trust Department and (iv) in
the case of Financial  Security,  to Financial Security Assurance Inc., 350 Park
Avenue,  New  York,  New  York  10022,  Attention:   Senior  Vice  President  --
Surveillance  Department;  Telex:  212-668-3101;   Confirmation:   212-826-0100;
Telecopy:  212-339-3518 or  212-339-3529  (in each case in which notice or other
communication  to  Financial  Security  refers to a Servicer  Default or a claim
under the  Policy or with  respect  to which  failure  on the part of  Financial
Security 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 the Head --  Financial  Guaranty  Group 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 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, 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 Financial Security.

          (a) The  Trustee  shall give prompt  notice to each Rating  Agency and
Financial  Security 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 Financial Security 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  pursuant to Section
     8.08;

          (iii) the appointment of a successor trustee 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
Financial Security:

                   (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 7.50% per annum.

Section 11.02.  Cut-Off Date.

          The Cut-Off Date for the Certificates is March 1, 1997.

Section 11.03.  Cut-Off Date Aggregate Principal Balance.

          The Cut-Off Date Aggregate Principal Balance is $225,041,300.94.

Section 11.04.  Original Class A Percentage.

          The Original Class A Percentage is 95.97744312%

Section 11.05.  Original Class A Subclass Principal Balances.

          As to the following  Subclasses of Class A  Certificates,  the Class A
Subclass Principal Balance of such Subclass as of the Cut-Off Date, as follows:

                                       Original Class A
          Class A Subclass             Subclass Principal Balance

            Class A-1                      $ 19,324,000.00
            Class A-2                      $ 20,000,000.00
            Class A-3                      $  3,008,000.00
            Class A-4                      $  4,500,000.00
            Class A-5                      $ 60,439,000.00
            Class A-6                      $ 31,016,000.00
            Class A-7                      $ 11,496,000.00
            Class A-8                      $ 29,702,000.00
            Class A-9                      $    298,000.00
            Class A-11                     $ 32,000,000.00
            Class A-12                     $  3,000,000.00
            Class A-PO                     $  1,256,218.72
            Class A-LR                     $        100.00
            Class A-R                      $        100.00

Section 11.06.  Original Class A Non-PO Principal Balance.

          The Original Class A Non-PO Principal Balance is $214,783,200.00.

Section 11.07.  Original Class A-10 Notional Amount.

          The Original Class A-10 Notional Amount is $19,324,000.00.

Section 11.08.  Original Subordinated Percentage.

          The Original Subordinated Percentage is 4.02255688%.

Section 11.09. Original Class M Percentage.

          The Original Class M Percentage is 1.25700961%.

Section 11.10.  Original Class M Principal Balance.

          The Original Class M Principal Balance is $2,813,000.00.

Section 11.11.  Original Class M Fractional Interest.

          The Original Class M Fractional Interest is 2.76554726%.

Section 11.12.  Original Class B-1 Percentage.

          The Original Class B-1 Percentage is 1.55863830%.

Section 11.13.  Original Class B-2 Percentage.

          The Original Class B-2 Percentage is 0.40217158%.

Section 11.14.  Original Class B-3 Percentage.

          The Original Class B-3 Percentage is 0.35212356%.

Section 11.15.  Original Class B-4 Percentage.

          The Original Class B-4 Percentage is 0.20108579%.

Section 11.16.  Original Class B-5 Percentage.

          The Original Class B-5 Percentage is 0.25152804%.

Section 11.17.  Original Class B Principal Balance.

          The Original Class B Principal Balance is $6,188,882.22.

Section 11.18.  Original Class B Subclass Principal Balances.

          As to any Class B Certificate,  the Class B Subclass Principal Balance
of such Subclass as of the Cut-Off Date, is as follows:

                                       Original Class B
          Class B Subclass             Subclass Principal Balance

            Class B-1                    $ 3,488,000.00
            Class B-2                    $   900,000.00
            Class B-3                    $   788,000.00
            Class B-4                    $   450,000.00
            Class B-5                    $   562,882.22

Section 11.19.  Original Class B-1 Fractional Interest.

          The Original Class B-1 Fractional Interest is 1.20690896%.

Section 11.20.  Original Class B-2 Fractional Interest.

          The Original Class B-2 Fractional Interest is 0.80473738%.

Section 11.21.  Original Class B-3 Fractional Interest.

          The Original Class B-3 Fractional Interest is 0.45261382%.

Section 11.22.  Original Class B-4 Fractional Interest.

          The Original Class B-4 Fractional Interest is 0.25152803%.

Section 11.23.  Closing Date.

          The Closing Date is March 27, 1997.

Section 11.24.  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 $22,504,130.09 (10% of the Cut-Off
Date Aggregate Principal Balance) at the time of any such purchase.

Section 11.25.  Wire Transfer Eligibility.

          With  respect to the Class A  Certificates  (other than the Class A-10
and Class  A-WIO  Certificates),  the  minimum  Denomination  eligible  for wire
transfer on each Distribution Date is $5,000,000. With respect to the Class A-10
Certificates,  the  minimum  Denomination  eligible  for wire  transfer  on each
Distribution  Date is  $5,000,000  Original  Class A-10  Notional  Amount.  With
respect to the Class A-WIO Certificates,  the minimum Denomination  eligible for
wire transfer on each  Distribution Date is 25% Percentage  Interest.  The Class
A-3, Class A-4, Class A-9, Class A-12,  Class A-PO, Class A-R, Class A-LR, Class
M, Class B-1, Class B-2, Class B-3, Class B-4 and Class B-5 Certificates are not
eligible for wire transfer;  provided, however, for so long as the Holder of the
Class A-3 or Class A-4 Certificates is the Clearing Agency or its nominee,  such
Holder will be entitled to a wire transfer.

Section 11.26.  Single Certificate.

          A Single Certificate for each Subclass of Class A Certificates  (other
than the Class A-8, Class A-9, Class A-10, Class A-WIO, Class A-R and Class A-LR
Certificates)  represents a $100,000 Denomination.  A Single Certificate for the
Class A-8 Certificates  represents a $1,000  Denomination.  A Single Certificate
for the Class A-9  Certificate  represents  a  $298,000  Denomination.  A Single
Certificate   for  the  Class  A-10   Certificate   represents   a   $19,324,000
Denomination. A Single Certificate for the Class A-WIO Certificates represents a
Denomination of 25% Percentage  Interest.  A Single  Certificate for each of the
Class A-R and Class A-LR Certificates  represents a $100 Denomination.  A Single
Certificate   for  each  of  the Class M,  Class B-1,  Class B-2,  Class B-3 and
Class B-5 Certificates represents a $250,000 Denomination.  A Single Certificate
for the Class B-4  Certificate  represents a Denomination  equal to the Original
Class B Subclass Principal Balance of such Subclass.

Section 11.27.  Servicing Fee Rate.

          The rate used to calculate  the  Servicing  Fee is equal to 0.250% per
annum.

Section 11.28.  Master Servicing Fee Rate.

          The rate used to calculate the Master  Servicing Fee for each Mortgage
Loan is 0.016% per annum.

Section 11.29.  Initial Financial Security Contact Person.

          The  initial  Financial  Security  Contact  Person  shall be B.  David
Bialzak, Vice President of the Seller.

<PAGE>

          IN WITNESS  WHEREOF,  the Seller,  the Master Servicer 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:------------------------------------
                                      Title:-----------------------------------


                                   NORWEST BANK MINNESOTA, NATIONAL ASSOCIATION
                                     as Master Servicer


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


                                   FIRST UNION NATIONAL BANK OF NORTH CAROLINA
                                     as Trustee


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

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





<PAGE>



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

          On this 27th day of March, 1997, before me, a notary public in and for
the State of New York, personally B. David Bialzak, known to me who, being by me
duly sworn, did depose and say that he resides at Frederick,  Maryland;  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 NEW YORK  )
                   ) ss.:
COUNTY OF NEW YORK )

          On this 27th day of March, 1997, before me, a notary public in and for
the State of New York, personally appeared Sherri Sharps, known to me who, being
by me duly sworn, did depose and say that she resides at Frederick;  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 NORTH CAROLINA)
                       ) ss.:
COUNTY OF              )

          On this 27th day of March, 1997, 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  s/he  resides  at
- ----------------,  North Carolina; that s/he is a --------------------- of First
Union National Bank of North Carolina,  a national banking  association,  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 27th day of March, 1997, 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 of North Carolina, 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>



                                     



                                   SCHEDULE I

    Norwest Asset Securities Corporation, Mortgage Pass-Through Certificates,
          Series 1997-4 Applicable Unscheduled Principal Receipt Period

                                         Full Unscheduled    Partial Unscheduled
 Servicer                                Principal Receipts  Principal Receipts

 Countrywide Home Loans, Inc.               Prior Month        Prior Month
 First Bank National Association            Prior Month        Prior Month
 HomeSide Lending                           Prior Month        Prior Month
 National City Mortgage Company             Prior Month        Prior Month
 Suntrust Mortgage, Inc.                    Prior Month        Prior Month
 Norwest Mortgage, Inc. (Exhibit F-1)       Prior Month        Prior Month
 Norwest Mortgage, Inc. (Exhibit F-2)       Mid-Month          Mid-Month

<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 TRUSTEE 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 1997-4 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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination: $
by this Certificate:  %

<PAGE>

          THIS  CERTIFIES  THAT  ---------------------------  is the  registered
owner of the  Percentage  Interest  evidenced  by this  Certificate  in  monthly
distributions to the Holders of 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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount  for the Class A-1  Certificates  required  to be
distributed  to Holders of 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  Subclasses of
Class A Certificates may not commence on the first  Distribution  Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses 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 7.25% 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 Trustee 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  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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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 TRUSTEE 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 1997-4 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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate: %



<PAGE>



          THIS  CERTIFIES  THAT  ---------------------------  is the  registered
owner of the  Percentage  Interest  evidenced  by this  Certificate  in  monthly
distributions to the Holders of 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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount  for the Class A-2  Certificates  required  to be
distributed  to Holders of 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  Subclasses of
Class A Certificates may not commence on the first  Distribution  Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses 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 7.50% 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 Trustee 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  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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By-----------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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 TRUSTEE 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 1997-4 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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE OR
ANY OF THEIR AFFILIATES, OR BY ANY GOVERNMENT AGENCY OR PRIVATE INSURER.

          UNTIL THE  ACCRETION  TERMINATION  DATE,  THE INTEREST THAT ACCRUES ON
THIS CERTIFICATE WILL NOT BE PAYABLE. BECAUSE SUCH UNPAID INTEREST WILL BE ADDED
TO THE  PRINCIPAL  BALANCE OF THIS  CERTIFICATE  AND  BECAUSE  DISTRIBUTIONS  IN
REDUCTION  OF THE  PRINCIPAL  BALANCE  OF THIS  CERTIFICATE  WILL BE MADE IN THE
MANNER  DESCRIBED  IN THE  POOLING  AND  SERVICING  AGREEMENT,  THE  OUTSTANDING
PRINCIPAL  BALANCE OF THIS  CERTIFICATE AT ANY TIME MAY BE MORE OR LESS THAN THE
INITIAL PRINCIPAL BALANCE REPRESENTED HEREBY.

Certificate No.                        Cut-Off Date:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination: $
by this Certificate:  %

<PAGE>

          THIS  CERTIFIES  THAT  ---------------------------  is the  registered
owner of the  Percentage  Interest  evidenced  by this  Certificate  in  monthly
distributions to the Holders of 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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount  for the Class A-3  Certificates  required  to be
distributed  to Holders of Class A-3  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  Subclasses of
Class A Certificates may not commence on the first  Distribution  Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses 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 7.50% per annum. Prior to the Accretion  Termination Date, interest
otherwise  available for distribution  with respect to this Certificate will not
be distributed as interest on this  Certificate but such amount will be added to
the principal balance of this Certificate on each Distribution  Date. 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.

          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 Trustee 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  is issued on March 27,  1997,  at an issue price of
94.63567%, including accrued interest, and a stated redemption price at maturity
equal to the sum of its initial principal balance and all interest distributions
hereon (whether current or accrued),  and is issued with original issue discount
("OID") for federal income tax purposes.  Assuming that this Certificate pays in
accordance  with  projected cash flows  reflecting the prepayment  assumption of
225% SPA (as  defined in the  Prospectus  Supplement  dated  March 19, 1997 with
respect to the offering of the Class A-1, Class A-2, Class A-3, Class A-4, Class
A-5, Class A-6, Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11,  Class
A-12,  Class  A-PO,  Class A-R and Class A-LR  Certificates)  used to price this
Certificate:  (i) the amount of OID as a  percentage  of the  initial  principal
balance of this Certificate is approximately 30.31098227%; (ii) the annual yield
to maturity of this Certificate, compounded monthly, is approximately 9.51%; and
(iii) the amount of OID allocable to the short first  accrual  period (March 27,
1997 to April 25, 1997) as a percentage of the initial principal balance of this
Certificate, calculated using the exact method, is approximately 0.69957443%.

          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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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


<PAGE>

                                   EXHIBIT A-4
                     [FORM OF FACE OF CLASS A-4 CERTIFICATE]

  [UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
    DEPOSITORY TRUST COMPANY TO THE TRUSTEE 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 1997-4 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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate: %

<PAGE>

          THIS CERTIFIES THAT -------------------------- is the registered owner
of  the   Percentage   Interest   evidenced  by  this   Certificate  in  monthly
distributions to the Holders of 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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount  for the Class A-4  Certificates  required  to be
distributed  to Holders of 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  Subclasses of
Class A Certificates may not commence on the first  Distribution  Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses of
Class A Certificates  in accordance  with the  provisions of the Agreement.  The
pass-through rate on the Class A-4 Certificates  applicable to each Distribution
Date will be 7.50% 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-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 Trustee 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  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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>

                                      
                                   EXHIBIT A-5
                     [FORM OF FACE OF CLASS A-5 CERTIFICATE]

  [UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
    DEPOSITORY TRUST COMPANY TO THE TRUSTEE 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 1997-4 CLASS A-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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997


Percentage Interest evidenced          Denomination: $
by this Certificate:  %

<PAGE>

          THIS  CERTIFIES  THAT  ----------------------------  is the registered
owner of the  Percentage  Interest  evidenced  by this  Certificate  in  monthly
distributions to the Holders of Class A-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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount  for the Class A-5  Certificates  required  to be
distributed  to Holders of Class A-5  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  Subclasses of
Class A Certificates may not commence on the first  Distribution  Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses of
Class A Certificates  in accordance  with the  provisions of the Agreement.  The
pass-through rate on the Class A-5 Certificates  applicable to each Distribution
Date will be 7.50% 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-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,  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 Trustee 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  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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>

                                      
                                   EXHIBIT A-6
                     [FORM OF FACE OF CLASS A-6 CERTIFICATE]

  [UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
    DEPOSITORY TRUST COMPANY TO THE TRUSTEE 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 1997-4 CLASS A-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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate:      %

<PAGE>

          THIS CERTIFIES THAT  ------------------------- is the registered owner
of  the   Percentage   Interest   evidenced  by  this   Certificate  in  monthly
distributions to the Holders of Class A-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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount  for the Class A-6  Certificates  required  to be
distributed  to Holders of Class A-6  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  Subclasses of
Class A Certificates may not commence on the first  Distribution  Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses of
Class A Certificates  in accordance  with the  provisions of the Agreement.  The
pass-through rate on the Class A-6 Certificates  applicable to each Distribution
Date will be 7.50% 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-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,  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 Trustee 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  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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>

                                      
                                   EXHIBIT A-7

                     [FORM OF FACE OF CLASS A-7 CERTIFICATE]

  [UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
    DEPOSITORY TRUST COMPANY TO THE TRUSTEE 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 1997-4 CLASS A-7

                    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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate:      %

<PAGE>

          THIS CERTIFIES THAT -------------------------- is the registered owner
of  the   Percentage   Interest   evidenced  by  this   Certificate  in  monthly
distributions  to the Holder of Class A-7  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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount  for the Class A-7  Certificates  required  to be
distributed  to Holders of Class A-7  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  Subclasses of
Class A Certificates may not commence on the first  Distribution  Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses of
Class A Certificates  in accordance  with the  provisions of the Agreement.  The
pass-through rate on the Class A-7 Certificates  applicable to each Distribution
Date will be 7.50% 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-7 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 Trustee 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  is issued on March 27, 1997, and based on its issue
price of 97.81367%, including accrued interest, and a stated redemption price at
maturity  equal to its initial  principal  balance (plus two days of interest at
the  Pass-Through  Rate hereon),  is issued with original issue discount ("OID")
for  federal  income  tax  purposes.  Assuming  that  this  Certificate  pays in
accordance  with  projected cash flows  reflecting the Prepayment  Assumption of
225% SPA (as  defined in the  Prospectus  Supplement  dated  March 19, 1997 with
respect to the offering of the Class A-1, Class A-2, Class A-3, Class A-4, Class
A-5, Class A-6, Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11,  Class
A-12,  Class  A-PO,  Class A-R and Class A-LR  Certificates)  used to price this
Certificate:  (i) the amount of OID as a  percentage  of the  initial  principal
balance of this Certificate is approximately 2.22800000%;  (ii) the annual yield
to maturity of this Certificate, compounded monthly, is approximately 7.87%; and
(iii) the amount of OID allocable to the short first  accrual  period (March 27,
1997 to April 25, 1997) as a percentage of the initial principal balance of this
Certificate, calculated using the exact method, is approximately 0.01509366%.

          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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>

                                      
                                   EXHIBIT A-8

                     [FORM OF FACE OF CLASS A-8 CERTIFICATE]

  [UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
    DEPOSITORY TRUST COMPANY TO THE TRUSTEE 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 1997-4 CLASS A-8

                    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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate:      %

<PAGE>

          THIS CERTIFIES THAT -------------------------- is the registered owner
of  the   Percentage   Interest   evidenced  by  this   Certificate  in  monthly
distributions to the Holders of Class A-8  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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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-8  Certificates  on such
Distribution Date as specified in the Agreement. Distributions of principal will
be made to the Holders of the Class A-8  Certificates  as described below and in
the  Agreement.  Prior  to the  first  Distribution  Date  following  the  first
Distribution  Date on which any principal  losses are allocated to the Class A-8
Certificateholders  occurring  on or  after  the  earliest  to  occur of (a) the
Cross-Over  Date, (b) the date on which Special Hazard Losses exceed the Special
Hazard Loss  Amount,  (c) the date on which Fraud  Losses  exceed the Fraud Loss
Amount and (d) the date on which  Bankruptcy  Losses exceed the Bankruptcy  Loss
Amount,  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
Subclasses of Class A  Certificates  may not commence on the first  Distribution
Date specified  above.  Distributions  of principal will be allocated  among the
Subclasses  of Class A  Certificates  in accordance  with the  provisions of the
Agreement.  The pass-through  rate on the Class A-8  Certificates  applicable to
each  Distribution  Date will be 7.50% 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-8 Certificates, as described in
the Agreement.  Any Non-Supported  Interest Shortfall allocated to the Class A-8
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-8  Certificates  will be  entitled  to the  benefits  of a
Financial  Guaranty Insurance Policy issued by Financial Security Assurance Inc.
(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 Trustee 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  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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By-------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>


                                   EXHIBIT A-9

                     [FORM OF FACE OF CLASS A-9 CERTIFICATE]

                        MORTGAGE PASS-THROUGH CERTIFICATE
                             SERIES 1997-4 CLASS A-9

                    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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate:      %

<PAGE>

          THIS CERTIFIES THAT  ------------------------  is the registered owner
of  the   Percentage   Interest   evidenced  by  this   Certificate  in  monthly
distributions to the Holder of the Class A-9 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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Class A Subclass  Distribution Amount for the Class A-9 Certificate  required to
be distributed to Holder of the Class A-9 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  Subclasses of
Class A Certificates may not commence on the first  Distribution  Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses of
Class A Certificates  in accordance  with the  provisions of the Agreement.  The
Class A-9  Certificate  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.
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 Trustee 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  is issued on March 27,  1997,  at an issue price of
30.00000%  and a stated  redemption  price  at  maturity  equal  to its  initial
principal  balance,  and is issued  with  original  issue  discount  ("OID") for
federal income tax purposes.  Assuming that this  Certificate pays in accordance
with projected cash flows  reflecting the Prepayment  Assumption of 225% SPA (as
defined in the  Prospectus  Supplement  dated March 19, 1997 with respect to the
offering of the Class A-1,  Class A-2,  Class A-3,  Class A-4,  Class A-5, Class
A-6, Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11, Class A-12, Class
A-PO, Class A-R and Class A-LR Certificates) used to price this Certificate: (i)
the  amount of OID as a  percentage  of the  initial  principal  balance of this
Certificate is  approximately 70.00000000%; (ii) the annual yield to maturity of
this  Certificate,  compounded  monthly,  is approximately  8.83%; and (iii) the
amount of OID  allocable to the short first  accrual  period  (March 27, 1997 to
April  25,  1997) as a  percentage  of the  initial  principal  balance  of this
Certificate, calculated using the exact method, is approximately 0.20608299%.

          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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By-------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>

                                    

                                  EXHIBIT A-10

                    [FORM OF FACE OF CLASS A-10 CERTIFICATE]

                        MORTGAGE PASS-THROUGH CERTIFICATE
                            SERIES 1997-4 CLASS A-10

                    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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE OR
ANY OF THEIR AFFILIATES, OR BY ANY GOVERNMENT AGENCY OR PRIVATE INSURER.

          THE NOTIONAL AMOUNT OF THIS  CERTIFICATE WILL BE REDUCED IN THE MANNER
DESCRIBED IN THE POOLING AND SERVICING  AGREEMENT.  ACCORDINGLY  THE OUTSTANDING
NOTIONAL  AMOUNT OF THIS  CERTIFICATE  AT ANY TIME MAY BE LESS THAN THE  INITIAL
NOTIONAL AMOUNT REPRESENTED HEREBY.

Certificate No.                Cut-Off Date:   March 1, 1997

CUSIP No.:                     First Distribution Date:  April 25, 1997

Percentage Interest evidenced  Denomination:$------- (Initial Notional Amount)
                                               
by this Certificate:      %

<PAGE>

          THIS CERTIFIES THAT  ------------------------- is the registered owner
of  the   Percentage   Interest   evidenced  by  this   Certificate  in  monthly
distributions  to the Holder of the Class  A-10  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,  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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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  (the "Record Date"),  in an
amount  equal to the Class A  Subclass  Distribution  Amount  for the Class A-10
Certificate  for such  Distribution  Date,  subject  to  adjustment,  in certain
events,  as  specified  in the  Agreement.  The Class  A-10  Certificate  is not
entitled to distributions  in respect of principal.  Interest will accrue on the
Class  A-10  Certificate  each  month in an amount  equal to the  product of (i)
1/12th of 0.25%  and (ii) the  Class  A-10  Notional  Amount  as of the  related
Distribution  Date. 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-10 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,  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 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 Trustee 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  is issued on March 27,  1997,  at an issue price of
0.53056% of the initial Class A-10 Notional Amount,  including accrued interest,
and a stated  redemption  price at maturity equal to all interest  distributions
hereon,  and is issued with original issue  discount  ("OID") for federal income
tax purposes.  Assuming that this  Certificate pays in accordance with projected
cash flows  reflecting  the  prepayment  assumption  225% SPA (as defined in the
Prospectus  Supplement  dated March 19, 1997 with respect to the offering of the
Class A-1,  Class A-2,  Class A-3,  Class A-4,  Class A-5, Class A-6, Class A-7,
Class A-8, Class A-9, Class A-10,  Class A-11, Class A-12, Class A-PO, Class A-R
and Class A-LR Certificates)  used to price this Certificate:  (i) the amount of
OID as a percentage of the initial Class A-10 Notional  Amount is  approximately
0.33665625%;  (ii) the annual yield to maturity of this Certificate,  compounded
monthly,  is approximately  27.66%; and (iii) the amount of OID allocable to the
short first accrual period (March 27, 1997 to April 25, 1997) as a percentage of
the initial Class A-10 Notional Amount,  calculated  using the exact method,  is
approximately 0.01140579%.

          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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By-------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>

                                  EXHIBIT A-11

                    [FORM OF FACE OF CLASS A-11 CERTIFICATE]

  [UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
    DEPOSITORY TRUST COMPANY TO THE TRUSTEE 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 1997-4 CLASS A-11

                    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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate:      %

<PAGE>

          THIS CERTIFIES THAT  ------------------------- is the registered owner
of  the   Percentage   Interest   evidenced  by  this   Certificate  in  monthly
distributions to the Holders of Class A-11  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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount for the Class A-11  Certificates  required  to be
distributed to Holders of Class A-11  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  Subclasses of
Class A Certificates may not commence on the first  Distribution  Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses of
Class A Certificates  in accordance  with the  provisions of the Agreement.  The
pass-through rate on the Class A-11 Certificates applicable to each Distribution
Date will be 7.50% 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-11 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 Trustee 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  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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.

Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer

Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>

                                    
                                  EXHIBIT A-12

                    [FORM OF FACE OF CLASS A-12 CERTIFICATE]

THIS  CERTIFICATE IS SUBORDINATED  TO THE CLASS A-11  CERTIFICATES TO THE EXTENT
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 THE FIDUCIARY  RESPONSIBILITY  PROVISIONS OF THE EMPLOYEE
RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF
THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED (THE "CODE"),  OR 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 1997-4 CLASS A-12

                    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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                            First Distribution Date:  April 25, 1997

Percentage Interest evidenced         Denomination:  $
by this Certificate:      %

<PAGE>

          THIS  CERTIFIES  THAT  ---------------------------  is the  registered
owner of the  Percentage  Interest  evidenced  by this  Certificate  in  monthly
distributions  to the Holder of Class A-12  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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount for the Class A-12  Certificates  required  to be
distributed to Holders of Class A-12  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  Subclasses of
Class A Certificates may not commence on the first  Distribution  Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses of
Class A Certificates  in accordance  with the  provisions of the Agreement.  The
pass-through rate on the Class A-12 Certificates applicable to each Distribution
Date will be 7.50% 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-12 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 Trustee for that purpose in the notice
of final distribution.

          No transfer of a Class A-12 Certificate will be made unless the Holder
hereof  desiring to make any such  transfer  shall  deliver to the Trustee (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 Trustee  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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By-------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>

                                    

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


                        MORTGAGE PASS-THROUGH CERTIFICATE
                            SERIES 1997-4, 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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate: %

<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,  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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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-PO  Distribution  Amount  required to be  distributed to Holders of 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.
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 Trustee 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  is issued on March 27,  1997,  at an issue price of
65.00000%  and a stated  redemption  price  at  maturity  equal  to its  initial
principal  balance,  and is issued  with  original  issue  discount  ("OID") for
federal income tax purposes.  Assuming that this  Certificate pays in accordance
with projected cash flows  reflecting the Prepayment  Assumption of 225% SPA (as
defined in the  Prospectus  Supplement  dated March 19, 1997 with respect to the
offering of the Class A-1,  Class A-2,  Class A-3,  Class A-4,  Class A-5, Class
A-6, Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11, Class A-12, Class
A-PO, Class A-R and Class A-LR Certificates) used to price this Certificate: (i)
the  amount of OID as a  percentage  of the  initial  principal  balance of this
Certificate is approximately 35.00000000%;  (ii) the annual yield to maturity of
this  Certificate,  compounded  monthly,  is approximately  7.04%; and (iii) the
amount of OID  allocable to the short first  accrual  period  (March 27, 1997 to
April  25,  1997) as a  percentage  of the  initial  principal  balance  of this
Certificate, calculated using the exact method, is approximately 0.35560128%.

          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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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 TRUSTEE 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 UPPER-TIER  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 THE
FIDUCIARY  RESPONSIBILITY  PROVISIONS 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 1997-4, 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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $100.00
by this Certificate: 100%

<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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount  for the Class  A-R  Certificate  required  to be
distributed  to the Holders 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  Subclasses of
Class A Certificates will not commence on the first  Distribution Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses 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 7.50% 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 Trustee 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  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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.

Dated:  March 27, 1997

                                    First Union National Bank of North Carolina,
                                     Trustee


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

Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>
                                      
                                  EXHIBIT A-LR
                    [Form of Face of Class A-LR 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 TRUSTEE 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-LR  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 LOWER-TIER  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 LOWER-TIER 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 THE
FIDUCIARY  RESPONSIBILITY  PROVISIONS 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 1997-4, CLASS A-LR


                    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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $100.00
by this Certificate: 100%

<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-LR  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,  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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount for the Class  A-LR  Certificate  required  to be
distributed to the Holders of the Class A-LR  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  Subclasses of
Class A Certificates will not commence on the first  Distribution Date specified
above.  Distributions  of principal  will be allocated  among the  Subclasses of
Class A Certificates  in accordance  with the  provisions of the Agreement.  The
pass-through rate on the Class A-LR Certificate  applicable to each Distribution
Date will be 7.50% 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-LR 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 Trustee 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  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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.

Dated:  March 27, 1997

                                   First Union National Bank of North Carolina,
                                     Trustee


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

Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>
                                     

                                  EXHIBIT A-WIO

                    [FORM OF FACE OF CLASS A-WIO 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 THE FIDUCIARY  RESPONSIBILITY  PROVISIONS OF THE EMPLOYEE  RETIREMENT
INCOME  SECURITY  ACT OF 1974,  AS AMENDED  ("ERISA"),  OR  SECTION  4975 OF THE
INTERNAL  REVENUE CODE OF 1986,  AS AMENDED (THE  "CODE"),  OR ANY  GOVERNMENTAL
PLAN,  AS DEFINED IN SECTION  3(32) OF ERISA,  SUBJECT TO ANY FEDERAL,  STATE OR
LOCAL LAW WHICH IS, TO A MATERIAL EXTENT, SIMILAR TO THE FOREGOING PROVISIONS OF
ERISA OR THE CODE (COLLECTIVELY, A "PLAN"), OR ANY PERSON ACTING ON BEHALF OF OR
INVESTING THE ASSETS OF A PLAN.

<PAGE>

                        MORTGAGE PASS-THROUGH CERTIFICATE
                            SERIES 1997-4 CLASS A-WIO

                    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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE OR
ANY OF THEIR AFFILIATES, OR BY ANY GOVERNMENT AGENCY OR PRIVATE INSURER.

Certificate No.                        Cut-Off Date:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced
by this Certificate:      %

<PAGE>

          THIS CERTIFIES THAT -------------------------- is the registered owner
of  the   Percentage   Interest   evidenced  by  this   Certificate  in  monthly
distributions  to the Holder of Class A-WIO  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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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
Subclass  Distribution  Amount for the Class A-WIO  Certificates  required to be
distributed to Holders of Class A-WIO  Certificates on such  Distribution  Date,
subject to adjustment in certain events as specified in the Agreement. The Class
A-WIO  Certificates  will  not  be  entitled  to  distributions  in  respect  of
principal.  Interest  will  accrue on the Class A-WIO  Certificates  during each
month in an  amount  equal to the  product  of (A)  1/12th  of (i) the  Weighted
Average Net Mortgage  Interest Rate of the Premium  Mortgage  Loans on the first
day of such month minus (ii) 7.50% and (B) the Class A-WIO Notional Amount as of
the related  Distribution  Date.  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-WIO 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 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 Trustee for that purpose in the notice of final distribution.

          No  transfer  of a Class  A-WIO  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 Trustee or the Seller may require the
Holder to deliver an opinion of counsel  acceptable to and in form and substance
satisfactory  to the  Trustee  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 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 Trustee  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
Trustee  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  is issued on March 27,  1997,  at an issue price of
1.33465% of the initial Class A-WIO Notional Amount, including accrued interest,
and a stated  redemption  price at maturity equal to all interest  distributions
hereon,  and is issued with original issue  discount  ("OID") for federal income
tax  purposes.  Assuming  (a) that  this  Certificate  pays in  accordance  with
projected  cash  flows  reflecting  the  Prepayment  Assumption  of 225% SPA (as
defined in the  Prospectus  Supplement  dated March 19, 1997 with respect to the
offering of the Class A-1,  Class A-2,  Class A-3,  Class A-4,  Class A-5, Class
A-6, Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11, Class A-12, Class
A-PO, Class A-R and Class A-LR  Certificates) used to price this Certificate and
(b) that the Pass-Through  Rate hereon changes in accordance with the Prepayment
Assumption:  (i) the amount of OID as a  percentage  of the initial  Class A-WIO
Notional Amount is approximately 1.21501710%;  (ii) the annual yield to maturity
of this Certificate,  compounded monthly, is approximately 14.85%; and (iii) the
amount of OID  allocable to the short first  accrual  period  (March 27, 1997 to
April 25,  1997) as a percentage  of the initial  Class A-WIO  Notional  Amount,
calculated using the exact method, is approximately 0.01541153%.

          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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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,  FINANCIAL  SECURITY AND THE CLASS M 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 THE FIDUCIARY  RESPONSIBILITY  PROVISIONS OF THE EMPLOYEE
RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF
THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED (THE "CODE"),  OR 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 1997-4, 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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                            First Distribution Date:  April 25, 1997

Percentage Interest evidenced         Denomination:  $
by this Certificate: %

<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,  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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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, Financial Security and the Class M
Certificates as specified in the Agreement,  any Class B-1  Distribution  Amount
required  to be  distributed  to  Holders  of  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 7.50% 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.
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 Trustee for that purpose in the notice
of final distribution.

          No  transfer  of a Class  B-1  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 Trustee or the Seller may require the
Holder to deliver an opinion of counsel  acceptable to and in form and substance
satisfactory  to the  Trustee  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 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 Trustee  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 Trustee  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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee


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,  FINANCIAL  SECURITY,  THE CLASS M CERTIFICATES  AND THE CLASS B-1
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 THE FIDUCIARY  RESPONSIBILITY  PROVISIONS OF THE EMPLOYEE
RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF
THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED (THE "CODE"),  OR 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 1997-4, 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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate: %

<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,  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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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,  Financial  Security,  the Class M
Certificates and each Subclass 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  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 7.50% 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.
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 Trustee for that purpose in the notice
of final distribution.

          No  transfer  of a Class  B-2  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 Trustee or the Seller may require the
Holder to deliver an opinion of counsel  acceptable to and in form and substance
satisfactory  to the  Trustee  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 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 Trustee  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 Trustee  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  is issued on March 27, 1997, and based on its issue
price of 96.97917%, including accrued interest, and a stated redemption price at
maturity  equal to its initial  principal  balance (plus two days of interest at
the  Pass-Through  Rate hereon),  is issued with original issue discount ("OID")
for  federal  income  tax  purposes.  Assuming  that  this  Certificate  pays in
accordance  with  projected cash flows  reflecting the Prepayment  Assumption of
225% SPA (as  defined in the  Prospectus  Supplement  dated  March 19, 1997 with
respect to the offering of the Class A-1, Class A-2, Class A-3, Class A-4, Class
A-5, Class A-6, Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11,  Class
A-12,  Class  A-PO,  Class A-R and Class A-LR  Certificates)  used to price this
Certificate:  (i) the amount of OID as a  percentage  of the  initial  principal
balance of this Certificate is approximately 3.06250000%;  (ii) the annual yield
to maturity of this Certificate, compounded monthly, is approximately 7.92%; and
(iii) the amount of OID allocable to the short first  accrual  period (March 27,
1997 to April 25, 1997) as a percentage of the initial principal balance of this
Certificate, calculated using the exact method, is approximately 0.01429706%.

          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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By-------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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,  FINANCIAL  SECURITY,  THE  CLASS M  CERTIFICATES,  THE  CLASS B-1
CERTIFICATES  AND THE CLASS B-2  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 THE FIDUCIARY  RESPONSIBILITY  PROVISIONS OF THE EMPLOYEE
RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF
THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED (THE "CODE"),  OR 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 1997-4, 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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate:         %

<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,  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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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,  Financial  Security,  the Class M
Certificates and each Subclass 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  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 7.50% 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.
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 Trustee for that purpose in the notice
of final distribution.

          No  transfer  of a Class  B-3  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 Trustee or the Seller may require the
Holder to deliver an opinion of counsel  acceptable to and in form and substance
satisfactory  to the  Trustee  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 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 Trustee  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 Trustee  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  is issued on March 27, 1997, and based on its issue
price of 82.94792%, including accrued interest, and a stated redemption price at
maturity  equal to its initial  principal  balance (plus two days of interest at
the  Pass-Through  Rate hereon),  is issued with original issue discount ("OID")
for  federal  income  tax  purposes.  Assuming  that  this  Certificate  pays in
accordance  with  projected cash flows  reflecting the Prepayment  Assumption of
225% SPA (as  defined in the  Prospectus  Supplement  dated  March 19, 1997 with
respect to the offering of the Class A-1, Class A-2, Class A-3, Class A-4, Class
A-5, Class A-6, Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11,  Class
A-12,  Class  A-PO,  Class A-R and Class A-LR  Certificates)  used to price this
Certificate:  (i) the amount of OID as a  percentage  of the  initial  principal
balance of this Certificate is approximately 17.09375000%; (ii) the annual yield
to maturity of this Certificate,  compounded monthly,  is approximately  10.16%;
and (iii) the amount of OID allocable to the short first  accrual  period (March
27, 1997 to April 25, 1997) as a percentage of the initial  principal balance of
this   Certificate,   calculated  using  the  exact  method,   is  approximately
0.07190239.

          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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee


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,  FINANCIAL  SECURITY,  THE  CLASS M  CERTIFICATES,  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 THE FIDUCIARY  RESPONSIBILITY  PROVISIONS OF THE EMPLOYEE
RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF
THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED (THE "CODE"),  OR 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 1997-4, 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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate:

<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,  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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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,  Financial  Security,  the Class M
Certificates and each Subclass 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  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 7.50% 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.
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 Trustee 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 Trustee or the Seller may require the
Holder to deliver an opinion of counsel  acceptable to and in form and substance
satisfactory  to the  Trustee  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 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 Trustee  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 Trustee  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  is issued on March 27, 1997, and based on its issue
price of 65.29167%, including accrued interest, and a stated redemption price at
maturity  equal to its initial  principal  balance (plus two days of interest at
the  Pass-Through  Rate hereon),  is issued with original issue discount ("OID")
for  federal  income  tax  purposes.  Assuming  that  this  Certificate  pays in
accordance  with  projected cash flows  reflecting the Prepayment  Assumption of
225% SPA (as  defined in the  Prospectus  Supplement  dated  March 19, 1997 with
respect to the offering of the Class A-1, Class A-2, Class A-3, Class A-4, Class
A-5, Class A-6, Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11,  Class
A-12,  Class  A-PO,  Class A-R and Class A-LR  Certificates)  used to price this
Certificate:  (i) the amount of OID as a  percentage  of the  initial  principal
balance of this Certificate is approximately 34.75000000%; (ii) the annual yield
to maturity of this Certificate,  compounded monthly,  is approximately  13.94%;
and (iii) the amount of OID allocable to the short first  accrual  period (March
27, 1997 to April 25, 1997) as a percentage of the initial  principal balance of
this   Certificate,   calculated  using  the  exact  method,   is  approximately
0.12437668%.

          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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.

Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer

Countersigned:

First Union National Bank of North Carolina,
  Trustee

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,  FINANCIAL  SECURITY,  THE  CLASS M  CERTIFICATES,  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 THE FIDUCIARY  RESPONSIBILITY  PROVISIONS OF THE EMPLOYEE
RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF
THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED (THE "CODE"),  OR 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 1997-4, 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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate:

<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,  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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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,  Financial  Security,  the Class M
Certificates and each Subclass 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  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 7.50% 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 Trustee 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 Trustee or the Seller may require the
Holder to deliver an opinion of counsel  acceptable to and in form and substance
satisfactory  to the  Trustee  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 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 Trustee  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 Trustee  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  is issued on March 27, 1997, and based on its issue
price of 34.01042%, including accrued interest, and a stated redemption price at
maturity  equal to its initial  principal  balance (plus two days of interest at
the  Pass-Through  Rate hereon),  is issued with original issue discount ("OID")
for  federal  income  tax  purposes.  Assuming  that  this  Certificate  pays in
accordance  with  projected cash flows  reflecting the Prepayment  Assumption of
225% SPA (as  defined in the  Prospectus  Supplement  dated  March 19, 1997 with
respect to the offering of the Class A-1, Class A-2, Class A-3, Class A-4, Class
A-5, Class A-6, Class A-7, Class A-8, Class A-9, Class A-10,  Class A-11,  Class
A-12,  Class  A-PO,  Class A-R and Class A-LR  Certificates)  used to price this
Certificate:  (i) the amount of OID as a  percentage  of the  initial  principal
balance of this Certificate is approximately 66.03125000%; (ii) the annual yield
to maturity of this Certificate,  compounded monthly,  is approximately  27.41%;
and (iii) the amount of OID allocable to the short first  accrual  period (March
27, 1997 to April 25, 1997) as a percentage of the initial  principal balance of
this   Certificate,   calculated  using  the  exact  method,   is  approximately
0.14107903%.

          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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By------------------------------------------
  Authorized Officer

Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>

                                       
                                    EXHIBIT C
                      [FORM OF FACE OF CLASS M CERTIFICATE]

THIS CERTIFICATE IS SUBORDINATED IN RIGHT OF PAYMENT TO THE CLASS A CERTIFICATES
AND  FINANCIAL  SECURITY 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 THE FIDUCIARY  RESPONSIBILITY  PROVISIONS OF THE EMPLOYEE
RETIREMENT INCOME SECURITY ACT OF 1974, AS AMENDED ("ERISA"), OR SECTION 4975 OF
THE INTERNAL  REVENUE CODE OF 1986, AS AMENDED (THE "CODE"),  OR 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 1997-4, CLASS M

            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 OR ANY OF THEIR AFFILIATES, AND
IS NOT INSURED OR GUARANTEED BY THE SELLER, THE MASTER SERVICER,  THE TRUSTEE 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:   March 1, 1997

CUSIP No.:                             First Distribution Date:  April 25, 1997

Percentage Interest evidenced          Denomination:  $
by this Certificate: %

<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 M 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,
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 March 27, 1997 (the
"Agreement") among the Seller, Norwest Bank Minnesota,  National Association, as
master servicer (the "Master Servicer"),  and First Union National Bank of North
Carolina,  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 Financial Security as specified
in the Agreement,  any Class M Distribution Amount required to be distributed to
Holders  of  Class  M  Certificates  on  such  Distribution   Date,  subject  to
adjustment,  in certain events, as specified in the Agreement.  The pass-through
rate on the Class M Certificates  applicable to each  Distribution  Date will be
7.50% 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 M 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 Trustee for that purpose in the notice
of final distribution.

          No transfer of a Class M 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 Trustee or the Seller may require the Holder to deliver an opinion
of counsel  acceptable to and in form and substance  satisfactory to the Trustee
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  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 Trustee 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 Trustee 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 Trustee has caused this Certificate to be duly
executed as of the date set forth below.


Dated:  March 27, 1997
First Union National Bank of North Carolina,
  Trustee
By-------------------------------------------
  Authorized Officer


Countersigned:

First Union National Bank of North Carolina,
  Trustee

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

<PAGE>

                                    EXHIBIT D

                 [Form of Reverse of Series 1997-4 Certificates]

                      NORWEST ASSET SECURITIES CORPORATION
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1997-4

          This  Certificate is one of a duly  authorized  issue of  Certificates
issued in several  Classes and  Subclasses  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  Trustee,  such  advances  are  reimbursable  to such  Servicer,  the Master
Servicer or the Trustee 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
Trustee, as applicable,  of advances made by such Servicer,  the Master Servicer
or the Trustee.

          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  and  the  Trustee  and  the  rights  of the
Certificateholders  under the  Agreement  at any time by the Seller,  the Master
Servicer  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 or Subclass 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 Trustee,  duly endorsed by, or
accompanied  by an assignment  in the form below or other written  instrument of
transfer in form satisfactory to the Trustee 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 Subclass 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 Subclass 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 Trustee 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  Trustee  and the  Certificate
Registrar,  and any agent of the Seller, the Master Servicer, 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 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  Trustee  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 or Subclass,
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 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 OF NORTH  CAROLINA,  not  individually,  but  solely  as  Trustee
(including  its  successors  under the Pooling and Servicing  Agreement  defined
below, the "Trustee"),  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  T H A T
                           ----------------------------

          WHEREAS,  the Seller, the Master Servicer and the Trustee have entered
into a Pooling and  Servicing  Agreement  dated as of March 27, 1997 relating to
the issuance of Mortgage Pass-Through Certificates,  Series 1997-4 (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 Trustee 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 Trustee,  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 2.1. Custodian to Act as Agent; Acceptance of Custodial Files.
The Custodian,  as the duly appointed  agent of the Trustee 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 Trustee  subsequent to the date hereof (the "Custodial  Files") as agent for
the  Trustee,  in trust,  for the use and  benefit  of all  present  and  future
Certificateholders.

          Section  2.2.  Recordation  of  Assignments.  If  any  Custodial  File
includes one or more  assignments  to the Trustee 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 2.3. 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 Trustee.

          Section  2.4.   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 Trustee.

          Section 2.5. 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 2.6. 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 3.1. Custodian a Bailee and Agent of the Trustee. 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  Trustee,  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 2.5 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 3.2.  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 3.3.  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 3.4. 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 3.5. Custodian May Resign;  Trustee 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 Trustee 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 Trustee 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 Trustee may remove the Custodian at any time.  In such event,  the
Trustee 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 3.7.

          Any  resignation  or removal of the  Custodian  and  appointment  of a
successor  Custodian pursuant to any of the provisions of this Section 3.5 shall
become effective upon acceptance of appointment by the successor Custodian.  The
Trustee  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 Trustee without the prior approval of
the Seller and the Master Servicer.

          Section 3.6.  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 3.7.  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 4.1. 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 4.2. 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 Trustee  shall enter into any  amendment  hereof  except as permitted by the
Pooling and  Servicing  Agreement.  The Trustee  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 4.3.  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 4.4.  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 Trustee,  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 4.5.  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
                                          OF NORTH CAROLINA

230 South Tryon Street                    By:---------------------------------
Charlotte, North Carolina 28288           Name:-------------------------------
                                          Title:------------------------------



Address:                                  NORWEST ASSET SECURITIES
                                          CORPORATION
7485 New Horizon Way
Frederick, Maryland  21703                By:---------------------------------
                                          Name:-------------------------------
                                          Title:------------------------------



Address:                                  NORWEST BANK 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 of North  Carolina,  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
                 from locations other than Frederick, Maryland]

NASCOR
NMI / 1997-4  Exhibit F-1
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>       <C>                   <C>     <C>     <C>       <C>       <C>       <C>          <C>       <C>                <C>  
6990917   VIENNA                VA      22181   SFD       8.250     7.984     $3,966.69    360       1-Jun-26           $524,882.30 
6993995   SUNNYVALE             CA      94087   SFD       7.750     7.484     $1,862.67    360       1-Nov-26           $259,258.85 
6994304   ATHERTON              CA      94027   SFD       7.750     7.484     $4,063.49    360       1-Dec-26           $565,991.26 
6994307   AUSTIN                TX      78731   SFD       8.125     7.859     $1,989.89    360       1-Dec-26           $267,470.51 
6994351   HOWELL                NJ      07731   SFD       7.875     7.609     $1,087.60    360       1-Dec-26           $149,688.30 
6994367   WESTMINSTER           CO      80030   SFD       8.000     7.734     $2,623.21    360       1-Dec-26           $356,775.55 
6994406   ALPHARETTA            GA      30202   SFD       7.750     7.484     $1,576.11    360       1-Dec-26           $219,531.15 
6994410   WOODCLIFF LAKE        NJ      07675   SFD       8.125     7.859     $3,712.49    360       1-Dec-26           $498,825.23 
6994450   NEDERLAND             CO      80466   SFD       8.125     7.859     $5,197.48    360       1-Dec-26           $698,616.98 
6994508   KERRVILLE             TX      78028   SFD       8.000     7.734     $3,228.56    360       1-Jan-27           $438,400.91 
6994549   REDWOOD CITY          CA      94065   SFD       7.625     7.359     $2,176.47    360       1-Jan-27           $307,053.46 
6994554   WASHINGTON            DC      20015   SFD       7.875     7.609     $1,943.19    360       1-Dec-26           $267,443.04 
6994565   DALLAS                TX      75230   SFD       7.875     7.609     $4,350.42    360       1-Jan-27           $599,171.45 
6994566   AUSTIN                TX      78746   SFD       7.750     7.484     $2,378.49    360       1-Jan-27           $331,529.84 
6994567   SAN JOSE              CA      95132   SFD       7.750     7.484     $1,576.11    360       1-Dec-26           $219,531.15 
6994583   VICTORIA              MN      55386   SFD       7.750     7.484     $1,540.29    360       1-Jan-27           $214,695.52 
6994586   ENGLEWOOD             CO      80111   PUD       7.875     7.609     $3,712.36    360       1-Jan-27           $511,292.97 
6994597   HOUSTON               TX      77063   SFD       7.750     7.484     $2,507.44    360       1-Dec-26           $349,211.30 
6994602   GOLETA                CA      93117   SFD       8.500     8.234     $1,676.23    360       1-Dec-26           $217,601.00 
6994611   CRYSTAL LAKE          IL      60014   SFD       8.250     7.984     $2,035.18    360       1-Dec-26           $270,378.20 
6994615   EDINA                 MN      55424   SFD       7.625     7.359     $2,643.26    360       1-Dec-26           $372,633.95 
6994616   DURANGO               CO      81326   SFD       7.875     7.609     $2,537.74    360       1-Jan-27           $349,516.69 
6994618   BALTIMORE             MD      21212   SFD       7.500     7.234     $1,538.27    360       1-Jan-27           $219,672.24 
6994626   RENTON                WA      98059   SFD       7.750     7.484     $1,856.94    360       1-Jan-27           $258,560.23 
6994631   SANTA CLARITA         CA      91321   PUD       8.500     8.234     $1,937.66    360       1-Jul-26           $250,646.94 
6994647   ENCINITAS             CA      92024   SFD       7.625     7.359     $1,557.15    360       1-Dec-26           $219,519.26 
6994656   ST PAUL               MN      55105   SFD       8.000     7.734     $2,201.29    360       1-Jan-27           $299,596.08 
6994673   INCLINE VILLAGE       NV      89451   SFD       7.750     7.484     $2,005.95    360       1-Dec-26           $279,403.31 
6994683   ASHEVILLE             NC      28803   SFD       7.125     6.859     $1,482.18    360       1-Jan-27           $219,647.10 
6994706   KENNER                LA      70065   SFD       8.000     7.734     $1,981.16    360       1-Jan-27           $269,636.47 
6994707   METAIRIE              LA      70002   SFD       7.750     7.484     $1,540.29    360       1-Jan-27           $214,695.52 
6994712   FRANKTOWN             CO      80116   SFD       8.125     7.859     $2,598.74    360       1-Jan-27           $349,540.55 
6994741   DURANGO               CO      81301   PUD       7.875     7.609       $725.07    360       1-Jan-27            $99,861.91 
6994779   SAN ANTONIO           TX      78258   SFD       7.500     7.234     $1,834.74    360       1-Jan-27           $262,009.30 
6994785   AURORA                CO      80012   SFD       8.125     7.859     $1,624.81    360       1-Jan-27           $218,542.73 
6994789   WESTON                MA      02193   SFD       8.500     8.234     $4,569.65    360       1-Dec-26           $593,212.25 
6994796   NOVI                  MI      48375   SFD       8.000     7.734     $2,714.93    360       1-Jan-27           $369,501.82 
6994827   LIVERMORE             CA      94550   SFD       7.750     7.484     $1,724.36    360       1-Dec-26           $240,181.06 
6994830   ORANGE                CA      92667   PUD       8.000     7.734     $3,595.45    360       1-Jan-27           $489,340.24 
6994833   AURORA                CO      80016   SFD       7.875     7.609     $1,595.15    360       1-Dec-26           $219,542.82 
6994841   MERCER ISLAND         WA      98040   SFD       7.875     7.609     $6,525.62    360       1-Dec-26           $898,129.67 
6994843   WEST LINN             OR      97068   SFD       8.125     7.859     $1,882.23    360       1-Dec-26           $252,999.15 
6994848   MISSION VIEJO         CA      92692   PUD       8.000     7.734     $2,064.81    360       1-Nov-26           $280,637.17 
6994860   BELMONT               MA      02178   SFD       7.875     7.609     $2,316.60    360       1-Jan-27           $319,058.80 
6994868   CARLSBAD              CA      92008   PUD       9.000     8.734     $2,425.94    360       1-Jul-26           $300,147.37 
6994905   BURKE                 VA      22015   SFD       7.375     7.109     $1,961.52    360       1-Jan-27           $283,566.47 
6994956   POMPANO BEACH         FL      33062   LCO       8.500     8.234       $726.62    360       1-Jan-27            $94,385.10 
6994965   LOGAN                 UT      84321   SFD       8.250     7.984       $563.45    360       1-Dec-26            $74,842.68 




<CAPTION>
(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C>    
80.00                                      0.250                            0.0160      
60.47                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
75.00                                      0.250                            0.0160 
75.26                                      0.250                            0.0160 
64.14                                      0.250                            0.0160 
58.82                                      0.250                            0.0160 
43.75                                      0.250                            0.0160 
73.33                                      0.250                            0.0160 
75.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
69.65                                      0.250                            0.0160 
79.05                                      0.250                            0.0160 
65.49                                      0.250                            0.0160 
62.32                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
58.33                                      0.250                            0.0160 
94.78                    11                0.250                            0.0160 
89.65                    01                0.250                            0.0160 
79.99                                      0.250                            0.0160 
78.65                                      0.250                            0.0160 
41.12                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
90.00                    33                0.250                            0.0160 
78.57                                      0.250                            0.0160 
68.18                                      0.250                            0.0160 
70.00                                      0.250                            0.0160 
67.43                                      0.250                            0.0160 
90.00                    33                0.250                            0.0160 
68.25                                      0.250                            0.0160 
71.43                                      0.250                            0.0160 
73.15                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
70.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
70.00                                      0.250                            0.0160 
61.11                                      0.250                            0.0160 
37.50                                      0.250                            0.0160 
78.00                                      0.250                            0.0160 
89.99                    13                0.250                            0.0160 
90.00                    33                0.250                            0.0160 
90.00                    01                0.250                            0.0160 
63.50                                      0.250                            0.0160 
70.00                                      0.250                            0.0160 
60.00                                      0.250                            0.0160 
</TABLE>                                                                


<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-1
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>       <C>                   <C>     <C>     <C>       <C>       <C>       <C>          <C>       <C>                <C>  
6994976   OAKDALE               MN      55128   SFD       8.000     7.734     $1,761.04    360       1-Jan-27           $239,537.30 
6994980   CORCORAN              MN      55340   SFD       7.625     7.359     $2,647.15    360       1-Jan-27           $373,456.90 
6995014   BRECKENRIDGE          CO      80424   PUD       7.625     7.359     $1,557.15    360       1-Jan-27           $219,680.52 
6995050   INDIANAPOLIS          IN      46239   SFD       7.500     7.234       $957.04    240       1-Dec-16           $118,152.35 
6995051   ARLINGTON             VA      22207   SFD       7.500     7.234     $1,594.21    360       1-Jan-27           $227,660.52 
6995052   WYCKOFF               NJ      07481   SFD       7.875     7.609     $1,595.15    360       1-Jan-27           $219,696.21 
6995055   GLENDALE              AZ      85308   PUD       8.250     7.984     $2,028.42    360       1-Apr-26           $268,039.66 
6995057   EAST TROY             WI      53149   SFD       8.125     7.859     $4,454.98    360       1-Dec-26           $598,814.57 
6995069   LONGMEADOW            MA      01106   SFD       7.500     7.234     $1,723.56    360       1-Jan-27           $246,080.96 
6995075   SAN JOSE              CA      95135   SFD       7.750     7.484     $1,647.75    360       1-Jan-27           $229,674.29 
6995076   NEWTOWN               PA      18940   SFD       7.250     6.984     $2,046.53    360       1-Feb-27           $299,765.97 
6995080   NORTH MANKATO         MN      56003   SFD       7.750     7.484     $1,576.11    360       1-Dec-26           $219,451.32 
6995083   PARK CITY             UT      84060   LCO       8.625     8.359     $1,977.53    360       1-Feb-27           $254,099.89 
6995091   LOS GATOS             CA      95030   SFD       8.000     7.734     $2,861.68    360       1-Jan-27           $389,474.90 
6995092   MANHATTAN BEACH       CA      90266   SFD       7.750     7.484     $2,120.58    360       1-Jan-27           $295,580.83 
6995095   CAMARILLO             CA      93010   SFD       7.875     7.609     $2,006.63    360       1-Jan-27           $276,367.83 
6995105   DANVILLE              CA      94526   SFD       7.625     7.359     $1,986.78    360       1-Feb-27           $280,496.83 
6995114   WHITEFISH             MT      59937   SFD       8.000     7.734     $3,661.49    360       1-Dec-26           $497,988.82 
6995116   EDGEWOOD              NM      87015   SFD       7.875     7.609     $1,622.92    360       1-Jan-27           $223,520.91 
6995130   ARLINGTON             VA      22207   SFD       7.000     6.734     $1,441.05    360       1-Jan-27           $216,243.86 
6995131   LUSBY                 MD      20657   SFD       7.875     7.609     $2,995.26    360       1-Jan-27           $412,529.55 
6995132   CARY                  NC      27513   SFD       7.500     7.234     $1,503.31    360       1-Dec-26           $214,518.32 
6995133   CHAPEL HILL           NC      27514   SFD       7.750     7.484     $3,402.96    360       1-Jan-27           $474,327.33 
6995141   WAYZATA               MN      55391   SFD       7.875     7.609     $2,004.09    360       1-Jan-27           $276,018.33 
6995143   STONE LAKE            WI      54876   SFD       7.625     7.359     $1,557.15    360       1-Jan-27           $219,680.52 
6995144   MAPLE GROVE           MN      55311   SFD       8.125     7.859     $1,794.24    360       1-Dec-26           $241,172.57 
6995145   RENO                  NV      89509   SFD       8.000     7.734     $1,614.28    360       1-Dec-26           $219,554.20 
6995150   WAYZATA               MN      55391   SFD       7.875     7.609     $4,379.42    360       1-Jan-27           $602,515.56 
6995151   EDINA                 MN      55436   SFD       7.750     7.484     $5,373.09    360       1-Jan-27           $748,937.90 
6995156   ROCKVILLE             MD      20853   SFD       7.875     7.609     $2,392.73    360       1-Dec-26           $329,314.20 
6995157   ALEXANDRIA            VA      22307   SFD       7.250     6.984     $1,500.79    360       1-Jan-27           $219,655.72 
6995158   CYPRESS               TX      77429   SFD       7.750     7.484     $1,576.11    360       1-Dec-26           $219,530.28 
6995161   ASPEN                 CO      81611   LCO       8.125     7.859     $2,583.89    360       1-Jan-27           $347,543.18 
6995162   FRANKLIN              MA      02038   SFD       7.875     7.609     $1,852.44    360       1-Feb-27           $255,309.18 
6995163   SCOTTSDALE            AZ      85259   SFD       7.500     7.234     $1,538.27    360       1-Jan-27           $219,672.44 
6995167   ROANN                 IN      46974   SFD       8.375     8.109     $2,667.85    360       1-Jan-27           $350,562.16 
6995178   BENICIA               CA      94510   SFD       7.750     7.484     $1,877.04    360       1-Jan-27           $261,633.96 
6995181   SAN PEDRO AREA        CA      90731   LCO       8.375     8.109     $1,935.52    360       1-Dec-26           $254,171.85 
6995183   WADSWORTH             OH      44281   SFD       7.875     7.609     $1,798.17    360       1-Jan-27           $247,657.54 
6995186   FLAGSTAFF             AZ      86004   SFD       7.750     7.484     $1,570.38    360       1-Jan-27           $218,889.58 
6995187   SISTERS               OR      97759   SFD       8.250     7.984     $1,652.79    360       1-Dec-26           $219,576.23 
6995195   BRECKENRIDGE          CO      80424   SFD       7.875     7.609     $1,595.15    360       1-Jan-27           $219,696.21 
6995197   SAN CARLOS            CA      94070   SFD       8.000     7.734     $2,861.68    360       1-Jan-27           $389,474.90 
6995198   AUBURN                GA      30203   SFD       8.125     7.859       $467.77    360       1-Jan-27            $62,917.30 
6995200   LAKE OSWEGO           OR      97034   SFD       8.375     8.109     $1,819.61    360       1-Dec-26           $238,904.36 
6995202   PORTLAND              OR      97223   SFD       8.375     8.109     $1,710.16    360       1-Dec-26           $224,577.52 
6995208   BAKERSFIELD           CA      93306   SFD       7.625     7.359     $2,123.38    360       1-Jan-27           $299,564.36 
6995209   SCOTTSDALE            AZ      85255   SFD       8.125     7.859     $1,948.68    360       1-Jan-27           $259,937.85 


<CAPTION>
(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C> 
77.63                                      0.250                            0.0160 
68.00                                      0.250                            0.0160 
50.93                                      0.250                            0.0160 
85.47                    33                0.250                            0.0160 
80.00                                      0.250                            0.0160 
70.51                                      0.250                            0.0160 
78.59                                      0.250                            0.0160 
68.57                                      0.250                            0.0160 
94.99                    11                0.250                            0.0160 
54.76                                      0.250                            0.0160 
60.61                                      0.250                            0.0160 
74.45                                      0.250                            0.0160 
90.00                    33                0.250                            0.0160 
66.10                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
79.99                                      0.250                            0.0160 
79.84                                      0.250                            0.0160 
90.00                    06                0.250                            0.0160 
95.00                    06                0.250                            0.0160 
59.87                                      0.250                            0.0160 
58.90                                      0.250                            0.0160 
74.80                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
76.39                                      0.250                            0.0160 
90.00                    13                0.250                            0.0160 
72.61                                      0.250                            0.0160 
71.06                                      0.250                            0.0160 
61.08                                      0.250                            0.0160 
70.84                                      0.250                            0.0160 
58.20                                      0.250                            0.0160 
74.51                                      0.250                            0.0160 
79.09                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
92.46                    33                0.250                            0.0160 
90.00                    01                0.250                            0.0160 
94.28                    13                0.250                            0.0160 
80.00                                      0.250                            0.0160 
67.95                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
31.43                                      0.250                            0.0160 
76.52                                      0.250                            0.0160 
78.39                                      0.250                            0.0160 
70.00                                      0.250                            0.0160 
95.00                    11                0.250                            0.0160 
65.22                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
79.99                                      0.250                            0.0160 
                                                                          
</TABLE>


<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-1
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>       <C>                   <C>     <C>     <C>       <C>       <C>       <C>          <C>       <C>                <C>  
6995215   RENO                  NV      89502   SFD       7.625     7.359     $1,923.78    360       1-Jan-27           $271,405.31 
6995218   WEST ORANGE           NJ      07052   SFD       8.625     8.359     $1,837.53    360       1-Dec-26           $235,828.53 
6995219   MONTEREY              CA      93940   SFD       8.375     8.109     $4,431.22    360       1-Jan-27           $582,272.74 
6995220   SAN JOSE              CA      95138   PUD       7.875     7.609     $2,175.21    360       1-Jan-27           $299,585.73 
6995226   PALM DESERT           CA      92211   PUD       8.000     7.734     $1,693.90    360       1-Dec-26           $230,382.20 
6995227   ROWLAND HEIGHTS AREA  CA      91748   SFD       7.625     7.359     $2,048.35    360       1-Jan-27           $288,979.77 
6995229   ROWLAND HTS AREA      CA      91748   PUD       8.250     7.984     $1,711.01    360       1-Jan-27           $227,458.54 
6995231   ANAHEIM               CA      92808   PUD       7.875     7.609     $2,406.51    360       1-Jan-27           $331,441.66 
6995232   SAN RAMON             CA      94583   PUD       7.875     7.609     $2,471.04    360       1-Jan-27           $340,329.38 
6995234   ST CHARLES            IL      60175   SFD       8.250     7.984     $1,878.17    360       1-Jan-27           $249,680.06 
6995236   ATLANTA               GA      30324   SFD       7.875     7.609     $1,972.19    360       1-Feb-27           $271,812.81 
6995237   BOULDER               CO      80302   SFD       7.875     7.609     $3,422.33    360       1-Feb-27           $471,675.17 
6995238   SUPERIOR              CO      80027   SFD       7.250     6.984     $1,484.42    360       1-Jan-27           $217,259.47 
6995239   ANDOVER               MN      55304   SFD       8.000     7.734     $1,614.28    360       1-Dec-26           $219,554.20 
6995241   TACOMA                WA      98422   SFD       7.875     7.609     $1,595.15    360       1-Jan-27           $219,696.21 
6995244   BAKERSFIELD           CA      93312   SFD       8.000     7.734     $1,834.41    360       1-Jan-27           $249,663.40 
6995258   BELLEVUE              WA      98004   SFD       8.250     7.984     $2,130.22    360       1-Jan-27           $283,187.13 
6995261   BELLEVUE              WA      98004   SFD       7.500     7.234     $3,618.44    360       1-Jan-27           $516,729.47 
6995262   WOODINVILLE           WA      98072   SFD       7.375     7.109     $1,507.40    360       1-Jan-27           $217,916.84 
6995263   WOODINVILLE           WA      98072   SFD       7.625     7.359     $1,990.67    360       1-Feb-27           $281,046.44 
6995264   ALBANY                OR      97321   SFD       8.250     7.984     $2,313.90    360       1-Feb-27           $307,803.60 
6995267   GREAT FALLS           VA      22066   SFD       8.250     7.984     $2,400.30    360       1-Feb-27           $319,296.26 
6995274   LOS ALAMOS            CA      93440   SFD       7.875     7.609     $2,465.24    360       1-Jan-27           $339,530.48 
6995280   ROSEVILLE             MN      55113   SFD       8.000     7.734     $1,614.28    360       1-Dec-26           $219,554.20 
6995281   OAK PARK              IL      60302   SFD       7.875     7.609     $1,595.15    360       1-Dec-26           $219,542.82 
6995287   ROSWELL               NM      88201   SFD       7.000     6.734     $1,463.67    360       1-Jan-27           $219,638.27 
6995289   ERIE                  CO      80516   SFD       7.875     7.609     $1,984.88    360       1-Jan-27           $273,371.97 
6995295   ALEXANDRIA            VA      22312   SFD       8.125     7.859     $2,613.59    360       1-Dec-26           $351,304.53 
6995296   WYCKOFF               NJ      07481   SFD       7.875     7.609     $1,798.17    360       1-Feb-27           $247,829.33 
6995297   APEX                  NC      27502   SFD       7.875     7.609     $1,595.15    360       1-Dec-26           $219,542.82 
6995298   MINNEAPOLIS           MN      55419   SFD       7.875     7.609     $1,740.17    360       1-Jan-27           $239,668.58 
6995303   CHEVY CHASE           MD      20815   SFD       7.500     7.234     $2,036.11    360       1-Feb-27           $290,983.89 
6995304   ROSWELL               GA      30075   SFD       7.500     7.234     $1,538.27    360       1-Dec-26           $219,507.12 
6995307   UPPER SADDLE RIVE     NJ      07458   SFD       7.125     6.859     $1,482.18    360       1-Jan-27           $219,466.03 
6995309   AVALON                NJ      08202   SFD       8.000     7.734     $3,081.82    360       1-Feb-27           $419,718.18 
6995310   FAIRLAWN              OH      44333   SFD       8.500     8.234     $1,774.27    360       1-Feb-27           $230,610.21 
6995311   WALNUT CREEK          CA      94596   SFD       7.500     7.234     $1,538.27    360       1-Dec-26           $219,507.12 
6995313   ENUMCLAW              WA      98022   SFD       8.000     7.734     $1,614.28    360       1-Jan-27           $219,703.79 
6995314   DURANGO               CO      81301   PUD       7.875     7.609     $1,595.15    360       1-Jan-27           $219,696.21 
6995315   CONIFER               CO      80433   SFD       8.375     8.109     $2,130.10    360       1-Jan-27           $279,900.41 
6995316   SAN DIEGO             CA      92120   SFD       7.875     7.609     $1,856.18    360       1-Jan-27           $255,646.48 
6995318   SACRAMENTO            CA      95864   SFD       7.500     7.234     $4,537.90    360       1-Jan-27           $648,033.69 
6995319   CHULA VISTA           CA      91914   SFD       8.250     7.984     $1,652.41    360       1-Dec-26           $219,526.34 
6995320   MOORPARK              CA      93021   LCO       8.500     8.234     $1,674.69    360       1-Dec-26           $217,199.24 
6995321   SPARKS                NV      89436   SFD       8.000     7.734     $1,614.28    360       1-Dec-26           $219,554.20 
6995322   SIMI VALLEY           CA      93063   SFD       7.750     7.484     $1,934.31    360       1-Jan-27           $269,385.20 
6995326   OREGON CITY           OR      97045   SFD       8.000     7.734     $2,091.23    360       1-Feb-27           $284,808.77 
6995329   ROANOKE               VA      24018   SFD       8.000     7.734     $1,834.41    360       1-Jan-27           $249,600.53 


<CAPTION>
(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C> 
69.69                                      0.250                            0.0160 
89.15                    01                0.250                            0.0160 
69.99                                      0.250                            0.0160 
65.85                                      0.250                            0.0160 
79.99                                      0.250                            0.0160 
79.99                                      0.250                            0.0160 
74.99                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
90.00                    13                0.250                            0.0160 
72.46                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
62.86                                      0.250                            0.0160 
79.71                                      0.250                            0.0160 
78.62                                      0.250                            0.0160 
78.76                                      0.250                            0.0160 
75.00                                      0.250                            0.0160 
90.00                    06                0.250                            0.0160 
75.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
90.00                    33                0.250                            0.0160 
48.57                                      0.250                            0.0160 
58.96                                      0.250                            0.0160 
58.12                                      0.250                            0.0160 
35.77                                      0.250                            0.0160 
75.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
92.87                    13                0.250                            0.0160 
78.95                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
62.98                                      0.250                            0.0160 
55.00                                      0.250                            0.0160 
79.85                                      0.250                            0.0160 
94.99                    33                0.250                            0.0160 
62.68                                      0.250                            0.0160 
89.83                    06                0.250                            0.0160 
70.97                                      0.250                            0.0160 
95.00                    33                0.250                            0.0160 
80.00                                      0.250                            0.0160 
74.60                                      0.250                            0.0160 
94.87                    11                0.250                            0.0160 
90.00                    11                0.250                            0.0160 
87.01                    06                0.250                            0.0160 
71.62                                      0.250                            0.0160 
74.03                                      0.250                            0.0160 
75.76                                      0.250                            0.0160 
</TABLE>                                                                


<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-1
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>       <C>                   <C>     <C>     <C>       <C>       <C>       <C>          <C>       <C>                <C>  
6995333   SHORELINE             WA      98177   SFD       7.875     7.609     $1,624.88    360       1-Feb-27           $223,945.78 
6995334   ANDOVER               MA      01810   SFD       7.750     7.484     $2,116.28    360       1-Jan-27           $294,981.68 
6995335   N ANDOVER             MA      01845   SFD       7.750     7.484     $1,548.17    360       1-Dec-26           $215,639.47 
6995336   TEHACHAPI             CA      93561   SFD       7.875     7.609     $1,925.06    360       1-Dec-26           $264,948.24 
6995342   ST PAUL               MN      55105   SFD       8.000     7.734     $1,871.10    360       1-Jan-27           $254,656.66 
6995343   MENDOTA HEIGHTS       MN      55118   PUD       8.250     7.984     $2,013.40    360       1-Feb-27           $267,829.10 
6995346   MAPLE VALLEY          WA      98038   SFD       8.125     7.859     $1,618.64    360       1-Dec-26           $217,569.30 
6995353   CHARLOTTE             NC      28277   SFD       7.750     7.484     $1,748.05    360       1-Jan-27           $243,654.45 
6995354   CHARLOTTE             NC      28207   SFD       8.875     8.609     $4,399.92    360       1-Feb-27           $552,689.98 
6995357   CALABASAS             CA      91302   SFD       7.875     7.609     $3,262.81    360       1-Jan-27           $449,378.60 
6995358   PALMDALE              CA      93551   SFD       7.750     7.484     $2,269.59    360       1-Jan-27           $316,351.38 
6995359   WATERLOO              NE      68069   PUD       7.875     7.609     $2,762.51    360       1-Jan-27           $380,473.88 
6995360   INVERNESS             IL      60010   SFD       7.750     7.484     $1,948.64    360       1-Jan-27           $269,608.36 
6995364   PLYMOUTH              MN      55446   SFD       7.750     7.484     $1,912.82    360       1-Jan-27           $266,349.84 
6995370   SALISBURY             MD      21801   SFD       7.750     7.484     $1,576.11    360       1-Feb-27           $219,844.72 
6995371   FREDERICK             MD      21703   SFD       7.625     7.359     $1,866.45    360       1-Jan-27           $263,317.07 
6995372   POTOMAC               MD      20854   SFD       7.375     7.109     $2,431.18    360       1-Jan-27           $351,462.66 
6995373   RALEIGH               NC      27615   SFD       7.750     7.484     $1,568.23    360       1-Jan-27           $218,590.00 
6995374   BOSQUE FARMS          NM      87068   SFD       7.875     7.609     $1,885.18    360       1-Jan-27           $259,640.97 
6995375   PRIOR LAKE            MN      55372   SFD       7.875     7.609     $2,298.47    360       1-Feb-27           $316,781.84 
6995376   BAKERSFIELD           CA      93309   SFD       7.875     7.609     $2,900.28    360       1-Jan-27           $399,447.63 
6995377   HERNDON               VA      20170   PUD       7.875     7.609     $1,676.36    360       1-Jan-27           $230,880.74 
6995378   DRAPER                UT      84020   SFD       8.000     7.734     $2,232.85    360       1-Jan-27           $303,890.28 
6995379   WESTON                FL      33327   SFD       8.000     7.734     $2,430.23    360       1-Jan-27           $330,754.06 
6995380   NEWARK                DE      19711   SFD       7.125     6.859     $1,482.18    360       1-Jan-27           $219,647.10 
6995383   ESTES PARK            CO      80517   SFD       7.500     7.234     $1,538.27    360       1-Feb-27           $219,836.73 
6995385   LIVERMORE             CA      94550   SFD       7.375     7.109     $2,015.90    360       1-Jan-27           $291,428.45 
6995386   BENICIA               CA      94510   SFD       7.625     7.359     $1,556.44    360       1-Jan-27           $219,580.67 
6995388   BROADVIEW HGTS        OH      44147   SFD       7.750     7.484     $1,791.03    360       1-Feb-27           $249,823.55 
6995394   DRIPPING SPRINGS      TX      78626   SFD       7.500     7.234     $2,156.38    360       1-Jan-27           $307,468.82 
6995397   FRESNO                CA      93720   SFD       8.125     7.859     $1,844.91    360       1-Feb-27           $248,311.47 
6995398   LIVERMORE             CA      94550   SFD       7.625     7.359     $1,557.15    360       1-Feb-27           $219,840.77 
6995399   WILLIAMSBURG          VA      23188   PUD       8.250     7.984     $1,783.54    360       1-Jan-27           $237,101.20 
6995400   SAN DIEGO             CA      92014   SFD       7.750     7.484     $3,582.05    360       1-Feb-27           $499,646.11 
6995402   PLEASANTON            CA      94566   SFD       7.625     7.359     $2,116.30    360       1-Jan-27           $298,565.82 
6995403   OMAHA                 NE      68130   SFD       8.000     7.734     $1,834.41    360       1-Jan-27           $249,663.40 
6995407   ISSAQUAH              WA      98029   SFD       8.250     7.984     $2,250.79    360       1-Feb-27           $299,408.96 
6995408   SNOWMASS VILLAGE      CO      81615   LCO       7.750     7.484     $2,876.39    360       1-Feb-27           $401,216.63 
6995409   SIMI VALLEY           CA      93063   SFD       7.750     7.484     $1,656.74    360       1-Jan-27           $230,927.51 
6995418   EDEN PRAIRIE          MN      55347   SFD       8.125     7.859     $2,969.99    360       1-Jan-27           $399,474.91 
6995419   BLAINE                MN      55449   SFD       7.750     7.484     $1,625.18    360       1-Jan-27           $226,027.46 
6995420   DEERFIELD             IL      60015   SFD       7.875     7.609     $1,812.67    360       1-Feb-27           $249,827.96 
6995421   BLOOMINGTON           MN      55438   PUD       8.000     7.734     $1,987.77    360       1-Feb-27           $270,718.23 
6995423   ALEXANDRIA            VA      22302   SFD       7.750     7.484     $2,095.51    360       1-Dec-26           $291,876.65 
6995425   RANCHO MURIETA        CA      95683   SFD       7.875     7.609     $1,595.15    360       1-Feb-27           $219,848.60 
6995427   MAYNARD               MA      01754   SFD       8.125     7.859     $1,698.46    360       1-Dec-26           $228,298.05 
6995431   SAN JOSE              CA      95148   SFD       7.750     7.484     $2,406.79    360       1-Feb-27           $335,712.89 
6995433   CERRITOS              CA      90703   SFD       8.125     7.859     $2,038.15    360       1-Dec-26           $273,957.67 


<CAPTION>
(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C> 
90.00                    06                0.250                            0.0160 
70.00                                      0.250                            0.0160 
94.99                    33                0.250                            0.0160 
90.00                    33                0.250                            0.0160 
75.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
66.06                                      0.250                            0.0160 
63.54                                      0.250                            0.0160 
70.00                                      0.250                            0.0160 
53.57                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
74.12                                      0.250                            0.0160 
52.82                                      0.250                            0.0160 
89.99                    33                0.250                            0.0160 
85.44                    33                0.250                            0.0160 
90.00                    11                0.250                            0.0160 
80.00                                      0.250                            0.0160 
62.54                                      0.250                            0.0160 
89.66                    33                0.250                            0.0160 
76.94                                      0.250                            0.0160 
72.73                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
78.03                                      0.250                            0.0160 
88.45                    33                0.250                            0.0160 
75.55                                      0.250                            0.0160 
53.66                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
79.99                                      0.250                            0.0160 
71.43                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
74.58                                      0.250                            0.0160 
95.00                    33                0.250                            0.0160 
80.00                                      0.250                            0.0160 
89.92                    11                0.250                            0.0160 
88.44                    33                0.250                            0.0160 
84.99                    06                0.250                            0.0160 
58.19                                      0.250                            0.0160 
90.00                    33                0.250                            0.0160 
76.92                                      0.250                            0.0160 
74.99                                      0.250                            0.0160 
58.82                                      0.250                            0.0160 
90.00                    01                0.250                            0.0160 
75.00                                      0.250                            0.0160 
70.74                                      0.250                            0.0160 
75.00                                      0.250                            0.0160 
89.99                    13                0.250                            0.0160 
90.00                    11                0.250                            0.0160 
</TABLE>                                                               


<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-1
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>       <C>                   <C>     <C>     <C>       <C>       <C>       <C>          <C>       <C>                <C>  
6995435   ROCKLIN               CA      95677   SFD       8.375     8.109     $1,900.18    360       1-Jan-27           $249,688.14 
6995436   PIPERSVILLE           PA      18947   SFD       7.500     7.234     $1,919.34    360       1-Jan-27           $274,091.30 
6995437   ARDSLEY               NY      10502   SFD       8.500     8.234     $2,224.85    360       1-Feb-27           $289,174.71 
6995438   HOUSTON               TX      77027   SFD       8.750     8.484     $3,304.14    360       1-Feb-27           $419,758.36 
6995440   PISMO BEACH           CA      93449   SFD       8.500     8.234     $1,730.06    360       1-Feb-27           $224,863.69 
6995441   CLOVERDALE            CA      95425   SFD       7.625     7.359     $3,538.97    360       1-Feb-27           $499,638.11 
6995442   LAGUNA BEACH          CA      92651   SFD       8.000     7.734     $1,907.79    360       1-Feb-27           $259,825.54 
6995445   SAN DIEGO             CA      92127   SFD       7.625     7.359     $1,556.44    360       1-Feb-27           $219,740.84 
6995447   SAN JOSE              CA      95125   SFD       8.000     7.734     $1,614.28    360       1-Jan-27           $219,703.79 
6995448   NAPA                  CA      94559   SFD       8.250     7.984     $1,733.92    360       1-Jan-27           $230,504.65 
6995453   VOORHEES              NJ      08403   SFD       8.000     7.734     $1,842.48    360       1-Feb-27           $250,931.52 
6995454   WARREN TOWNSHIP       NJ      07059   SFD       7.375     7.109     $1,933.89    360       1-Feb-27           $279,786.94 
6995455   MIDDLETON             MA      01949   SFD       7.500     7.234     $2,363.35    360       1-Jan-27           $337,496.73 
6995457   DANA POINT            CA      92629   SFD       8.000     7.734     $3,016.59    360       1-Feb-27           $410,835.15 
6995461   CHICAGO               IL      60622   MF3       8.000     7.734     $1,962.83    360       1-Feb-27           $267,320.50 
6995462   INDEPENDENCE          MN      55359   SFD       8.125     7.859     $2,650.72    360       1-Feb-27           $356,766.47 
6995463   VIENNA                VA      22181   SFD       7.875     7.609     $3,045.29    360       1-Feb-27           $419,710.96 
6995465   ASPEN                 CO      81611   LCO       8.125     7.859       $631.12    360       1-Jan-27            $84,856.65 
6995467   WESTBOROUGH           MA      01581   SFD       8.250     7.984     $1,821.07    360       1-Jan-27           $242,089.80 
6995468   ESCONDIDO             CA      92029   SFD       8.250     7.984     $3,756.33    360       1-Feb-27           $499,681.17 
6995469   CHULA VISTA           CA      91910   SFD       8.000     7.734     $2,524.15    360       1-Dec-26           $343,302.92 
6995472   BOZEMAN               MT      59715   SFD       7.875     7.609     $2,175.21    360       1-Jan-27           $299,585.73 
6995475   PARK RIDGE            IL      60068   SFD       8.125     7.859     $1,670.62    360       1-Jan-27           $224,704.64 
6995476   BRECKENRIDGE          CO      80424   PUD       7.875     7.609     $1,595.15    360       1-Dec-26           $219,542.82 
6995479   MARINA                CA      93933   SFD       8.375     8.109     $1,641.76    360       1-Dec-26           $215,594.40 
6995480   ORANGE                CA      92867   SFD       7.750     7.484     $4,133.70    360       1-Jan-27           $576,182.89 
6995481   CAMARILLO             CA      93012   SFD       7.500     7.234     $1,615.88    360       1-Jan-27           $230,755.92 
6995482   SAN DIEGO             CA      92128   SFD       7.250     6.984     $1,500.79    360       1-Jan-27           $219,655.72 
6995483   SAN DIEGO             CA      92121   SFD       7.375     7.109     $1,740.85    360       1-Jan-27           $251,665.24 
6995484   RANCHO CUCAMONGA      CA      91737   SFD       8.750     8.484     $1,734.67    360       1-Feb-27           $220,373.14 
6995496   HOLLIS                NH      03049   SFD       8.750     8.484     $2,139.83    360       1-Jan-27           $271,685.86 
6995497   AMHERST               NY      14221   SFD       8.250     7.984     $4,507.60    360       1-Jan-27           $599,232.17 
6995502   BETHESDA              MD      20814   SFD       7.250     6.984     $2,919.72    360       1-Feb-27           $427,666.12 
6995505   NORWOOD               MA      02062   SFD       8.500     8.234     $3,396.68    360       1-Dec-26           $440,941.45 
6995506   NASHVILLE             TN      37205   SFD       8.000     7.734     $2,024.09    360       1-Jan-27           $275,478.59 
6995507   FISHERS               IN      46038   SFD       8.000     7.734     $1,898.62    360       1-Jan-27           $258,401.60 
6995508   HENDERSON             NV      89014   PUD       8.375     8.109     $2,593.75    360       1-Apr-26           $338,833.64 
6995509   NORTHBROOK            IL      60062   SFD       8.000     7.734     $5,429.86    360       1-Feb-27           $739,503.47 
6995510   ROCHESTER             MN      55902   SFD       8.750     8.484     $3,423.72    360       1-Feb-27           $434,949.61 
6995511   GRAND JUNCTION        CO      81506   PUD       8.500     8.234     $1,691.61    360       1-Feb-27           $219,866.72 
6995512   EAGAN                 MN      55123   SFD       7.750     7.484     $2,006.82    360       1-Jan-27           $279,724.31 
6995514   NORTH MIAMI           FL      33181   SFD       8.000     7.734     $2,180.75    360       1-Feb-27           $297,000.58 
6995518   BARRINGTON            IL      60010   SFD       7.875     7.609     $2,476.84    360       1-Jan-27           $341,128.28 
6995520   DANVILLE              CA      94506   SFD       8.125     7.859     $4,343.61    360       1-Jan-27           $584,232.07 
6995521   DUNCAN                SC      29334   SFD       7.375     7.109     $1,519.49    360       1-Jan-27           $219,601.13 
6995522   REDMOND               WA      98052   PUD       7.875     7.609     $2,182.46    360       1-Feb-27           $300,792.85 
6995523   ELLICOTT CITY         MD      21043   SFD       8.000     7.734     $1,678.49    360       1-Feb-27           $228,596.51 
6995524   VENICE AREA           CA      90291   SFD       7.750     7.484     $1,669.24    360       1-Jan-27           $231,907.09 


<CAPTION>
(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C> 
58.82                                      0.250                            0.0160  
90.00                    33                0.250                            0.0160  
90.00                    11                0.250                            0.0160  
80.00                                      0.250                            0.0160  
90.00                    33                0.250                            0.0160  
58.48                                      0.250                            0.0160  
46.43                                      0.250                            0.0160  
94.99                    13                0.250                            0.0160  
78.01                                      0.250                            0.0160  
94.98                    13                0.250                            0.0160  
90.00                    33                0.250                            0.0160  
48.28                                      0.250                            0.0160  
79.53                                      0.250                            0.0160  
75.43                                      0.250                            0.0160  
78.22                                      0.250                            0.0160  
75.00                                      0.250                            0.0160  
80.00                                      0.250                            0.0160  
14.17                                      0.250                            0.0160  
80.00                                      0.250                            0.0160  
79.11                                      0.250                            0.0160  
80.00                                      0.250                            0.0160  
66.67                                      0.250                            0.0160  
69.23                                      0.250                            0.0160  
54.74                                      0.250                            0.0160  
89.26                    33                0.250                            0.0160  
74.94                                      0.250                            0.0160  
89.98                    11                0.250                            0.0160  
74.58                                      0.250                            0.0160  
89.99                    11                0.250                            0.0160  
90.00                    13                0.250                            0.0160  
80.00                                      0.250                            0.0160  
60.00                                      0.250                            0.0160  
80.00                                      0.250                            0.0160  
75.00                                      0.250                            0.0160  
90.00                    33                0.250                            0.0160  
90.00                    12                0.250                            0.0160  
89.99                    01                0.250                            0.0160  
56.92                                      0.250                            0.0160  
80.00                                      0.250                            0.0160  
88.04                    11                0.250                            0.0160  
90.00                    33                0.250                            0.0160  
80.00                                      0.250                            0.0160  
80.00                                      0.250                            0.0160  
68.02                                      0.250                            0.0160  
78.01                                      0.250                            0.0160  
79.98                                      0.250                            0.0160  
75.00                                      0.250                            0.0160  
66.57                                      0.250                            0.0160  
</TABLE>                                                                   

<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-1
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>       <C>                   <C>     <C>     <C>       <C>       <C>       <C>          <C>       <C>                <C>  
6995525   IRVINE                CA      92620   SFD       7.875     7.609     $2,320.22    360       1-Jan-27           $319,558.11 
6995528   AUBURNDALE            MA      02166   SFD       7.875     7.609     $2,109.95    360       1-Feb-27           $290,799.74 
6995529   EDEN PRAIRIE          MN      55347   SFD       7.375     7.109     $2,590.03    360       1-Feb-27           $374,714.66 
6995531   HUNTINGTON            IN      46750   SFD       7.750     7.484     $2,399.98    360       1-Jan-27           $334,324.28 
6995532   CAMBRIDGE             MA      02138   SFD       8.000     7.734     $2,785.37    360       1-Jan-27           $379,088.90 
6995533   NORTH ANDOVER         MA      01845   SFD       7.625     7.359     $1,911.04    360       1-Feb-27           $269,804.59 
6995534   LAS VEGAS             NV      89110   SFD       7.875     7.609     $1,972.19    360       1-Feb-27           $271,812.81 
6995537   SILVER SPRING         MD      20910   SFD       7.750     7.484     $1,551.75    360       1-Jan-27           $216,293.26 
6995539   UPPER SADDLE RIVE     NJ      07458   SFD       8.000     7.734     $1,937.14    360       1-Feb-27           $263,822.86 
6995542   LOVELAND              CO      80538   SFD       7.375     7.109     $1,087.20    360       1-May-26           $156,178.48 
6995543   MONTGOMERY TWP        NJ      08558   SFD       7.750     7.484     $2,256.70    360       1-Feb-27           $314,777.67 
6995545   VACAVILLE             CA      95687   SFD       8.000     7.734     $1,599.61    360       1-Jan-27           $217,706.47 
6995546   CHARLOTTE             NC      28277   SFD       7.875     7.609     $2,320.22    360       1-Feb-27           $319,779.78 
6995549   HONOLULU              HI      96821   SFD       8.125     7.859     $4,187.68    360       1-Feb-27           $563,631.07 
6995552   LOS ANGELES           CA      91604   SFD       7.875     7.609     $2,349.22    360       1-Feb-27           $323,777.03 
6995553   FOSTER CITY           CA      94404   SFD       7.750     7.484     $1,862.67    360       1-Feb-27           $259,816.50 
6995554   SAN JOSE              CA      95125   SFD       7.875     7.609     $2,146.21    360       1-Feb-27           $295,796.29 
6995555   SAN DIEGO             CA      92130   SFD       7.750     7.484     $1,889.18    360       1-Jan-27           $263,326.56 
6995560   FARIBAULT             MN      55021   SFD       7.625     7.359     $1,789.16    240       1-Jan-17           $218,834.04 
6995565   ALEXANDRIA TWNSP      NJ      08848   SFD       8.250     7.984     $1,648.65    360       1-Jan-27           $219,169.18 
6995574   GOLDEN                CO      80403   SFD       8.375     8.109     $3,847.87    360       1-Feb-27           $505,935.33 
6995575   ALEXANDRIA            VA      22307   PUD       7.500     7.234     $1,826.70    360       1-Feb-27           $261,056.11 
6995576   CAREFREE              AZ      85377   SFD       7.500     7.234     $1,538.27    360       1-Feb-27           $219,836.73 
6995578   TULSA                 OK      74114   SFD       7.875     7.609     $3,132.30    360       1-Jan-27           $431,403.45 
6995579   APPLE VALLEY          MN      55124   SFD       7.875     7.609     $1,595.15    360       1-Dec-26           $219,542.82 
6995581   MONROVIA              MD      21770   SFD       8.375     8.109     $1,736.76    360       1-Feb-27           $228,357.98 
6995584   HUNTERSVILLE          NC      28078   SFD       7.875     7.609     $1,617.81    360       1-Jan-27           $222,816.89 
6995587   MILFORD               NJ      08848   SFD       8.500     8.234     $2,537.41    360       1-Feb-27           $329,800.09 
6995588   HILLSBOROUGH          NJ      08853   SFD       7.750     7.484     $1,873.06    360       1-Feb-27           $261,265.47 
6995590   OAK BROOK             IL      60521   SFD       8.250     7.984     $2,567.83    360       1-Feb-27           $341,582.05 
6995597   CORONADO              CA      92118   SFD       8.250     7.984     $1,502.53    360       1-Feb-27           $199,872.47 
6995598   BERNARDS TWP          NJ      07920   SFD       7.500     7.234     $2,008.70    360       1-Feb-27           $287,066.80 
6995599   BERNARDS TWP          NJ      07920   SFD       7.875     7.609     $3,313.57    360       1-Feb-27           $456,685.49 
6995600   WHEATON               IL      60187   SFD       8.000     7.734     $1,725.81    360       1-Dec-26           $234,723.41 
6995602   CEDAR RAPIDS          IA      52405   SFD       7.500     7.234     $1,398.43    360       1-Jan-27           $199,702.21 
6995603   DANVILLE              CA      94506   SFD       7.625     7.359     $2,116.30    360       1-Dec-26           $297,843.48 
6995605   BERNARDS TWP          NJ      07920   SFD       7.625     7.359     $4,600.66    360       1-Feb-27           $649,529.55 
6995606   FAIR HAVEN            NJ      07704   SFD       8.250     7.984     $2,404.05    360       1-Feb-27           $319,795.95 
6995607   SEA ISLE CITY         NJ      08243   LCO       8.375     8.109     $2,493.04    360       1-Feb-27           $327,796.13 
6995608   LONG BEACH TWP        NJ      08008   SFD       7.250     6.984     $1,500.79    360       1-Feb-27           $219,828.38 
6995609   SENECA                IL      61360   SFD       8.125     7.859     $1,682.50    360       1-Jan-27           $225,665.39 
6995611   CHARLOTTE             NC      28211   SFD       8.125     7.859     $2,027.02    360       1-Jan-27           $272,626.53 
6995613   HONOLULU              HI      96826   HCO       8.000     7.734       $953.89    360       1-Feb-27           $129,912.78 
6995614   HIGHLANDS RANCH       CO      80126   SFD       7.875     7.609     $1,595.15    360       1-Dec-26           $219,542.82 
6995615   DENVER                CO      80204   SFD       7.750     7.484     $1,619.81    360       1-Jan-27           $225,779.81 
6995617   BELLEVUE              WA      98006   SFD       8.250     7.984     $2,306.39    360       1-Feb-27           $306,804.24 
6995619   CORONADO              CA      92118   SFD       7.375     7.109     $1,933.89    360       1-Feb-27           $279,786.94 
6995621   MOKENA                IL      60448   SFD       7.750     7.484     $1,576.11    360       1-Jan-27           $219,688.44 


<CAPTION>
(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C> 
63.75                                      0.250                            0.0160 
79.73                                      0.250                            0.0160 
68.62                                      0.250                            0.0160 
74.44                                      0.250                            0.0160 
56.24                                      0.250                            0.0160 
88.82                    33                0.250                            0.0160 
80.00                                      0.250                            0.0160 
95.00                    33                0.250                            0.0160 
80.00                                      0.250                            0.0160 
90.00                    06                0.250                            0.0160 
90.00                    33                0.250                            0.0160 
89.97                    33                0.250                            0.0160 
57.57                                      0.250                            0.0160 
42.57                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
62.65                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
90.00                    11                0.250                            0.0160 
73.33                                      0.250                            0.0160 
95.00                    33                0.250                            0.0160 
75.00                                      0.250                            0.0160 
95.00                    33                0.250                            0.0160 
84.94                    33                0.250                            0.0160 
75.13                                      0.250                            0.0160 
69.85                                      0.250                            0.0160 
60.93                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
69.50                                      0.250                            0.0160 
90.00                    33                0.250                            0.0160 
69.76                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
79.90                                      0.250                            0.0160 
70.00                                      0.250                            0.0160 
75.87                                      0.250                            0.0160 
72.05                                      0.250                            0.0160 
74.46                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
80.00                                      0.250                            0.0160 
59.30                                      0.250                            0.0160 
71.94                                      0.250                            0.0160 
60.30                                      0.250                            0.0160 
30.23                                      0.250                            0.0160 
86.89                    11                0.250                            0.0160 
85.00                    33                0.250                            0.0160 
56.12                                      0.250                            0.0160 
69.14                                      0.250                            0.0160 
57.89                                      0.250                            0.0160 
                                                                        
</TABLE>


<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-1
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>       <C>                   <C>     <C>     <C>       <C>       <C>       <C>          <C>       <C>                <C>  
6995623   VALENCIA              CA      91354   SFD       7.750     7.484     $1,543.34    360       1-Jan-27           $215,120.92 
6995624   SAN DIEGO             CA      92128   SFD       6.875     6.609     $1,445.24    360       1-Jan-27           $219,629.30 
6995625   SAN DIEGO             CA      92128   SFD       7.375     7.109     $1,895.56    360       1-Jan-27           $274,031.04 
6995626   VALENCIA              CA      91354   SFD       7.375     7.109     $1,581.99    360       1-Feb-27           $228,875.71 
6995628   SAN JOSE              CA      95120   SFD       7.750     7.484     $1,576.11    360       1-Jan-27           $219,688.44 
6995630   METAIRIE              LA      70003   SFD       7.750     7.484     $1,576.11    360       1-Jan-27           $219,688.44 
6995631   SAN JOSE              CA      95119   SFD       7.750     7.484     $1,564.64    360       1-Jan-27           $218,090.72 
6995637   CHINA SPRING          TX      76633   SFD       7.750     7.484     $1,806.43    360       1-Feb-27           $251,972.04 
6995641   HERNDON               VA      22071   SFD       7.375     7.109     $2,265.41    360       1-Feb-27           $327,750.42 
6995642   PARADISE VALLEY       AZ      85253   SFD       7.875     7.609     $4,712.95    360       1-Feb-27           $649,552.68 
6995643   AUSTIN                TX      78731   SFD       7.750     7.484     $1,576.11    360       1-Dec-26           $219,531.15 
6995648   BOULDER               CO      80302   SFD       8.000     7.734     $2,568.18    360       1-Feb-27           $349,765.15 
6995653   BATAVIA               IL      60510   SFD       8.000     7.734     $1,761.04    360       1-Feb-27           $239,838.96 
6995654   FLOSSMOOR             IL      60422   SFD       8.125     7.859     $2,300.91    360       1-Feb-27           $309,138.01 
6995655   WEST CHESTER          PA      19382   SFD       7.375     7.109     $1,870.00    360       1-Jan-27           $270,128.13 
6995658   RED BANK BORO         NJ      07701   LCO       8.500     8.234     $2,749.63    360       1-Jan-27           $357,165.21 
6995660   SCOTTSDALE            AZ      85258   SFD       8.500     8.234     $3,844.57    360       1-Feb-27           $499,697.10 
6995663   OSSINING              NY      10562   LCO       8.500     8.234     $1,241.03    360       1-Feb-27           $161,302.22 
6995664   SCARSDALE             NY      10583   SFD       7.875     7.609     $2,900.28    360       1-Feb-27           $399,724.72 
6995667   NORTH POTOMAC         MD      20878   SFD       7.750     7.484     $1,834.02    360       1-Feb-27           $255,819.31 
6995669   RALEIGH               NC      27609   SFD       7.750     7.484     $2,686.55    360       1-Jan-27           $374,468.94 
6995671   FOREST LAKE           MN      55025   SFD       7.875     7.609     $1,957.69    360       1-Feb-27           $269,814.19 
6995673   ARLINGTON             VA      22207   SFD       7.250     6.984     $2,455.83    360       1-Feb-27           $359,719.17 
6995674   PRINCETON             NJ      08540   SFD       8.125     7.859     $2,536.37    360       1-Jan-27           $341,151.58 
6995675   BRENTWOOD             CA      94513   SFD       8.250     7.984     $2,404.05    360       1-Feb-27           $319,795.95 
6995677   GIG HARBOR            WA      98335   SFD       8.250     7.984     $2,374.01    360       1-Jul-26           $314,348.59 
6995678   SAN DIEGO             CA      92130   SFD       8.375     8.109     $1,824.17    360       1-Feb-27           $239,850.83 
6995681   THOUSAND OAKS         CA      91320   SFD       8.250     7.984     $2,712.07    360       1-Dec-26           $360,304.66 
6995683   SAN DIEGO             CA      92128   SFD       8.000     7.734     $2,489.66    360       1-Feb-27           $339,072.34 
6995687   RIVERSIDE             CA      92503   SFD       7.750     7.484     $1,559.63    360       1-Dec-26           $217,236.07 
6995688   CULVER CITY           CA      90230   LCO       8.000     7.734     $1,981.16    360       1-Jan-27           $269,636.47 
6995693   WASHINGTON            DC      20008   SFD       7.875     7.609     $4,640.44    360       1-Oct-26           $637,768.70 
6995700   WENATCHEE             WA      98801   SFD       8.000     7.734     $2,069.22    360       1-Feb-27           $281,810.78 
6995701   CORTE MADERA          CA      94925   SFD       8.250     7.984     $3,400.95    360       1-Dec-26           $451,722.60 
6995703   FARMINGTON HILLS      MI      48334   SFD       8.250     7.984     $1,923.24    360       1-Feb-27           $255,836.76 
6995705   FRANKLIN              MI      48025   SFD       8.375     8.109     $2,249.81    360       1-Dec-26           $295,444.21 
6995708   FREMONT               CA      94539   SFD       8.000     7.734     $2,494.80    360       1-Jan-27           $339,542.22 
6995715   CRANFORD              NJ      07016   SFD       7.750     7.484     $1,779.82    240       1-Jan-17           $216,038.24 
6995716   SANTA FE              NM      87501   SFD       7.750     7.484     $1,868.76    360       1-Jan-27           $260,480.61 
6995720   LANCASTER             PA      17603   SFD       8.000     7.734     $3,735.59    300       1-Feb-22           $483,491.08 
6995747   LOS GATOS             CA      95032   SFD       8.125     7.859     $3,689.53    360       1-Nov-26           $495,594.53 
6995762   SALT LAKE CITY        UT      84121   SFD       8.250     7.984     $1,994.61    360       1-Jan-27           $265,110.24 
6996096   GULF BREEZE           FL      32561   SFD       8.000     7.734     $1,885.41    360       1-Mar-27           $256,950.00 
6996128   OREM                  UT      84058   SFD       8.125     7.859     $1,670.62    360       1-Mar-27           $225,000.00 

                                                                                                                    $100,006,063.96
COUNT:             332
WAC:       7.921750261



<CAPTION>
(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C> 
90.00                    33                0.250                            0.0160
79.70                                      0.250                            0.0160
90.00                    11                0.250                            0.0160
90.00                    13                0.250                            0.0160
93.62                    11                0.250                            0.0160
88.00                    33                0.250                            0.0160
80.00                                      0.250                            0.0160
43.85                                      0.250                            0.0160
80.00                                      0.250                            0.0160
31.75                                      0.250                            0.0160
93.02                    33                0.250                            0.0160
74.07                                      0.250                            0.0160
89.89                    12                0.250                            0.0160
80.00                                      0.250                            0.0160
93.69                    33                0.250                            0.0160
80.00                                      0.250                            0.0160
80.00                                      0.250                            0.0160
68.68                                      0.250                            0.0160
53.33                                      0.250                            0.0160
80.00                                      0.250                            0.0160
78.95                                      0.250                            0.0160
77.36                                      0.250                            0.0160
57.94                                      0.250                            0.0160
80.00                                      0.250                            0.0160
80.00                                      0.250                            0.0160
79.93                                      0.250                            0.0160
80.00                                      0.250                            0.0160
79.69                                      0.250                            0.0160
90.00                    33                0.250                            0.0160
89.99                    13                0.250                            0.0160
90.00                    13                0.250                            0.0160
80.00                                      0.250                            0.0160
75.20                                      0.250                            0.0160
80.00                                      0.250                            0.0160
63.52                                      0.250                            0.0160
80.00                                      0.250                            0.0160
66.67                                      0.250                            0.0160
80.00                                      0.250                            0.0160
75.61                                      0.250                            0.0160
76.83                                      0.250                            0.0160
79.51                                      0.250                            0.0160
90.00                    33                0.250                            0.0160
90.00                    24                0.250                            0.0160
75.00                                      0.250                            0.0160
</TABLE>                                                                




                                 
<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-1
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>              <C>           
WAM:              356.985648
WALTV:           75.05760643

</TABLE>
 


<PAGE>

                                   EXHIBIT F-2


                    [Schedule of Mortgage Loans Serviced by
                    Norwest Mortgage in Frederick, Maryland]
NASCOR
NMI / 1997-4  Exhibit F-2
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>      <C>                     <C>   <C>      <C>       <C>       <C>       <C>          <C>       <C>                <C>  
3579994  SOUTH SAN FRANCISCO     CA    94080    SFD       9.125     8.859     $2,900.97    360       1-Aug-24           $349,550.03 
4489875  READINGTON TOWNSHIP     NJ    08833    SFD       8.125     7.859     $2,874.95    360       1-Feb-27           $386,946.72 
4493357  CLERMONT                FL    34711    SFD       8.000     7.734     $3,202.89    360       1-Jan-27           $435,912.27 
4512917  HILTON HEAD ISLAND      SC    29928    SFD       8.125     7.859     $2,672.99    360       1-Feb-27           $359,764.51 
4525373  ORANGE                  CA    92669    SFD       9.375     9.109     $4,158.75    360       1-Sep-26           $496,882.82 
4525781  ROBBINSVILLE            NJ    08691    SFD       7.250     6.984     $1,913.51    360       1-Feb-27           $280,281.18 
4530644  STATEN ISLAND           NY    10309    SFD       8.375     8.109     $2,447.44    360       1-Feb-27           $321,799.85 
4533464  CARNATION               WA    98014    SFD       8.250     7.984     $2,163.65    360       1-Feb-27           $287,816.35 
4533775  LAS VEGAS               NV    89128    SFD       8.000     7.734     $3,668.83    360       1-Jan-27           $499,326.78 
4535721  BERNARDS                NJ    07920    SFD       8.250     7.984     $2,253.80    360       1-Feb-27           $299,808.70 
4538098  PORT JEFFERSON STATION  NY    11776    SFD       8.375     8.109       $456.04    360       1-Oct-26            $59,810.93 
4539057  PHOENIX                 AZ    85024    SFD       7.875     7.609     $1,672.74    360       1-Sep-26           $229,731.60 
4540085  DOWNEY                  CA    90240    SFD       8.500     8.234     $1,861.54    360       1-Sep-26           $241,204.28 
4540342  SALT LAKE CITY          UT    84105    SFD       8.375     8.109     $1,634.16    360       1-Oct-26           $214,311.63 
4540937  MORGANVILLE             NJ    07751    SFD       9.125     8.859     $2,359.54    360       1-Sep-26           $289,056.22 
4541961  TUCSON                  AZ    85715    SFD       8.875     8.609     $6,206.03    360       1-Oct-26           $777,781.02 
4543579  BOUNTIFUL               UT    84010    SFD       9.000     8.734     $3,138.03    360       1-Oct-26           $388,918.75 
4543998  CHESHIRE                CT    06410    SFD       8.625     8.359     $2,450.04    360       1-Feb-27           $314,814.02 
4544456  TARZANA                 CA    91356    SFD       8.500     8.234     $3,921.46    360       1-Nov-26           $508,664.20 
4544463  QUOGUE                  NY    11959    SFD       8.500     8.234     $2,498.97    360       1-Jan-27           $324,604.84 
4545414  LEESBURG                VA    20175    SFD       7.750     7.484     $1,573.96    360       1-Jan-27           $219,388.87 
4545960  SCOTTSDALE              AZ    85255    SFD       8.625     8.359     $1,790.87    360       1-Nov-26           $229,700.32 
4546802  MONUMENT                CO    80132    SFD       8.125     7.859     $2,346.30    360       1-Jan-27           $315,585.17 
4547348  WESTMINSTER             CA    92683    SFD       8.875     8.609       $954.78    360       1-Nov-26           $119,727.88 
4547384  GLENVIEW                IL    60025    SFD       8.500     8.234     $2,691.20    360       1-Nov-26           $349,142.82 
4547531  BOCA RATON              FL    33431    PUD       8.250     7.984     $3,795.40    360       1-Dec-26           $504,226.89 
4547654  HOPKINTON               MA    01748    SFD       7.875     7.609     $2,714.66    360       1-Dec-26           $373,621.94 
4548367  SARASOTA                FL    34238    SFD       8.000     7.734       $513.64    360       1-Nov-26            $69,810.22 
4549519  SOMERS                  NY    10589    SFD       8.500     8.234     $3,198.69    360       1-Feb-27           $415,747.98 
4549584  JACKSON HEIGHTS         NY    11370    MF2       7.750     7.484     $2,127.74    360       1-Feb-27           $296,790.38 
4550136  BLOOMFIELD HILLS        MI    48301    LCO       8.250     7.984     $2,253.80    360       1-Jan-27           $299,616.08 
4550423  DAVIE                   FL    33328    SFD       8.375     8.109     $1,887.26    360       1-Dec-26           $247,833.77 
4550431  SCOTTSDALE              AZ    85262    SFD       8.375     8.109     $1,970.49    360       1-Nov-26           $258,598.65 
4550433  LOS ALAMITOS            CA    90720    SFD       8.375     8.109     $1,732.97    360       1-Dec-26           $227,269.78 
4550484  BOYDS                   MD    20841    SFD       8.000     7.734     $1,575.39    360       1-Dec-26           $214,264.95 
4550495  DAVIE                   FL    33328    SFD       8.500     8.234     $2,413.62    360       1-Feb-27           $313,709.84 
4550573  LAGUNA NIGUEL           CA    92677    SFD       8.000     7.734     $3,485.38    360       1-Dec-26           $474,037.47 
4550629  MAITLAND                FL    32751    SFD       8.375     8.109     $2,067.40    360       1-Jan-27           $271,660.69 
4550663  LANGHORNE               PA    19053    SFD       8.125     7.859     $2,376.00    360       1-Jan-27           $319,579.92 
4550763  SOUTHLAKE               TX    76092    SFD       8.125     7.859     $2,257.20    360       1-Nov-26           $303,196.43 
4551405  CUDJOE KEY              FL    33042    SFD       8.250     7.984     $1,615.22    360       1-Dec-26           $214,585.88 
4551627  CANOGA PARK             CA    91307    SFD       8.250     7.984       $991.68    360       1-Jan-27           $131,831.06 
4552179  ANNAPOLIS               MD    21401    SFD       8.000     7.734     $2,054.55    360       1-Feb-27           $279,812.12 
4552308  MCCALL                  ID    83638    SFD       8.000     7.734     $2,395.74    360       1-Jan-27           $326,060.40 
4552572  SHELTER ISLAND          NY    11964    SFD       7.875     7.609     $2,059.20    360       1-Feb-27           $283,804.55 
4552606  SAN RAFAEL              CA    94903    SFD       7.750     7.484     $3,137.89    360       1-Feb-27           $437,690.86 

<CAPTION>

(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C>    
80.00                                      0.250                            0.016    
80.00                                      0.250                            0.016    
79.98                                      0.250                            0.016    
76.60                                      0.250                            0.016    
66.67                                      0.250                            0.016    
79.99                                      0.250                            0.016    
89.44                    33                0.250                            0.016    
90.00                                      0.250                            0.016    
33.33                                      0.250                            0.016    
63.92                                      0.250                            0.016    
51.11                                      0.250                            0.016    
79.99                                      0.250                            0.016    
90.00                    06                0.250                            0.016    
72.76                                      0.250                            0.016    
63.04                                      0.250                            0.016    
65.00                                      0.250                            0.016    
32.50                                      0.250                            0.016    
90.00                                      0.250                            0.016    
75.00                                      0.250                            0.016    
89.04                    06                0.250                            0.016    
94.96                    13                0.250                            0.016    
89.99                    12                0.250                            0.016    
75.60                                      0.250                            0.016    
75.00                                      0.250                            0.016    
70.00                                      0.250                            0.016    
79.99                                      0.250                            0.016    
80.00                                      0.250                            0.016    
23.89                                      0.250                            0.016    
80.00                                      0.250                            0.016    
90.00                    01                0.250                            0.016    
61.22                                      0.250                            0.016    
79.98                                      0.250                            0.016    
79.99                                      0.250                            0.016    
79.17                                      0.250                            0.016    
95.00                    13                0.250                            0.016    
79.99                                      0.250                            0.016    
45.24                                      0.250                            0.016    
80.00                                      0.250                            0.016    
80.00                                      0.250                            0.016    
80.00                                      0.250                            0.016    
65.15                                      0.250                            0.016    
79.04                                      0.250                            0.016    
75.68                                      0.250                            0.016    
66.63                                      0.250                            0.016    
80.00                                      0.250                            0.016    
67.91                                      0.250                            0.016    
</TABLE>                                                                  

<PAGE>


NASCOR
NMI / 1997-4  Exhibit F-2
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>      <C>                     <C>   <C>      <C>       <C>       <C>       <C>          <C>       <C>                <C>  
4552822  LA PLATA                MD    20646    SFD       8.500     8.234     $1,845.40    360       1-Dec-26           $239,560.71 
4552895  OWINGS MILLS            MD    21117    SFD       8.000     7.734     $1,834.41    360       1-Jan-27           $249,663.40 
4553052  WEST ORANGE             NJ    07052    SFD       9.000     8.734     $2,369.62    360       1-Feb-27           $294,339.13 
4553196  PORTLAND                OR    97228    SFD       8.000     7.734     $1,812.40    360       1-Jan-27           $246,667.43 
4553236  HAILEY                  ID    83333    LCO       8.750     8.484       $921.07    360       1-Jan-27           $116,944.79 
4553340  GARDEN CITY             NY    11530    SFD       7.625     7.359     $2,406.50    360       1-Jan-27           $339,505.90 
4553358  FAIRFAX                 VA    22031    SFD       7.750     7.484     $2,109.83    360       1-Jan-27           $294,082.96 
4553359  PHILADELPHIA            PA    19106    HCO       8.500     8.234       $592.06    360       1-Jan-27            $76,906.37 
4553383  LAYTONSVILLE            MD    20882    SFD       7.750     7.484     $1,768.11    360       1-Jan-27           $246,450.49 
4553544  LAGRANGE                IL    60525    SFD       8.125     7.859     $1,880.01    360       1-Jan-27           $252,867.61 
4553695  VERO BEACH              FL    32963    SFD       8.250     7.984     $2,629.43    360       1-Feb-27           $349,776.82 
4553700  FORT WORTH              TX    76132    SFD       8.125     7.859     $1,804.27    360       1-Jan-27           $242,681.01 
4553786  ROSEVILLE               MN    55113    SFD       7.875     7.609     $1,646.27    360       1-Jan-27           $226,736.47 
4553986  WATER MILL              NY    11976    SFD       8.000     7.734     $3,081.82    360       1-Dec-26           $419,148.90 
4553998  IRVINE                  CA    92620    SFD       7.750     7.484     $2,022.43    360       1-Feb-27           $282,100.76 
4554017  WILMINGTON              DE    19805    SFD       8.375     8.109     $1,877.38    360       1-Jan-27           $246,691.88 
4554251  BEL AIR                 MD    21015    SFD       7.750     7.484     $2,364.16    360       1-Jan-27           $329,532.68 
4554277  MORGANVILLE             NJ    07751    SFD       8.250     7.984     $2,629.44    360       1-Jan-27           $349,552.09 
4554402  WOODCLIFF               NJ    07675    SFD       8.000     7.734     $2,054.54    360       1-Feb-27           $279,812.13 
4554573  CARLSBAD                CA    92009    SFD       8.000     7.734     $2,045.00    360       1-Jan-27           $278,324.75 
4554591  CEDARHURST              NY    11516    SFD       7.875     7.609     $2,639.25    360       1-Feb-27           $363,749.50 
4554628  TEANECK                 NJ    07666    SFD       8.125     7.859     $2,494.80    360       1-Feb-27           $335,780.20 
4554735  WILTON                  CT    06897    SFD       7.875     7.609     $1,812.67    360       1-Jan-27           $249,654.79 
4555055  SOMERS                  NY    10541    SFD       8.500     8.234     $2,197.17    360       1-Jan-27           $285,402.57 
4555753  WESTON                  CT    06883    SFD       7.875     7.609     $1,930.50    360       1-Feb-27           $266,066.77 
4555758  CARLSBAD                CA    92009    SFD       7.875     7.609     $2,870.55    360       1-Feb-27           $395,627.54 
4555807  GLEN COVE               NY    11560    SFD       8.125     7.859     $2,598.75    360       1-Feb-27           $349,771.04 
4555832  ROCKY HILL              NJ    08553    SFD       7.500     7.234     $1,734.05    360       1-Jan-27           $247,630.74 
4555839  WHITEWOOD               SD    57793    SFD       8.000     7.734     $1,650.97    360       1-Jan-27           $224,697.05 
4555846  DELMAR                  NY    12054    SFD       7.875     7.609     $3,480.33    360       1-Jan-27           $479,337.17 
4555859  CHAPPAQUA               NY    10514    SFD       8.250     7.984     $2,332.69    360       1-Feb-27           $310,302.00 
4555863  FAIRFAX                 VA    22031    SFD       8.375     8.109     $2,170.01    360       1-Jan-27           $285,143.85 
4555866  RYE                     NY    10580    SFD       7.875     7.609     $3,589.10    360       1-Feb-27           $494,659.34 
4556190  PHOENIX                 MD    21131    SFD       7.875     7.609     $1,957.69    360       1-Jan-27           $269,618.92 
4556301  RIDGEWOOD VILLAGE       NJ    07450    SFD       8.000     7.734     $3,169.87    360       1-Feb-27           $431,610.13 
4556354  BOCA RATON              FL    33496    SFD       8.000     7.734     $2,568.18    360       1-Dec-26           $349,290.75 
4556453  BIRMINGHAM              AL    35243    SFD       7.875     7.609     $1,577.03    360       1-Jan-27           $217,199.65 
4556458  TAPPAN                  NY    10983    SFD       8.625     8.359     $1,095.13    360       1-Jan-27           $140,482.60 
4556496  BRENTWOOD               TN    37027    SFD       7.875     7.609     $1,602.41    360       1-Jan-27           $220,694.81 
4556502  DALLAS                  TX    75230    SFD       8.375     8.109     $1,444.14    360       1-Jan-27           $189,762.98 
4556766  PAOLI                   PA    19301    SFD       8.000     7.734     $2,020.06    360       1-Feb-27           $275,115.27 
4556813  MAGNOLIA                TX    77355    SFD       8.250     7.984     $2,103.55    360       1-Feb-27           $279,821.45 
4556905  VOORHEES                NJ    08043    SFD       8.000     7.734     $2,193.96    360       1-Jan-27           $298,597.42 
4556921  YONKERS                 NY    10704    SFD       8.500     8.234     $1,833.86    360       1-Jan-27           $238,210.01 
4556922  STERLING                VA    20165    SFD       8.000     7.734     $1,863.76    360       1-Dec-26           $253,485.30 
4556936  MT KISCO                NY    10549    SFD       8.000     7.734     $2,714.93    360       1-Feb-27           $369,751.74 

<CAPTION>

(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C>    
80.00                                      0.250                            0.016
66.49                                      0.250                            0.016
95.00                                      0.250                            0.016
56.99                                      0.250                            0.016
80.00                                      0.250                            0.016
79.07                                      0.250                            0.016
80.00                                      0.250                            0.016
70.00                                      0.250                            0.016
69.99                                      0.250                            0.016
80.00                                      0.250                            0.016
59.32                                      0.250                            0.016
90.00                    12                0.250                            0.016
95.00                    11                0.250                            0.016
80.00                                      0.250                            0.016
79.99                                      0.250                            0.016
95.00                    01                0.250                            0.016
71.74                                      0.250                            0.016
80.00                                      0.250                            0.016
53.85                                      0.250                            0.016
74.64                                      0.250                            0.016
85.65                    06                0.250                            0.016
80.00                                      0.250                            0.016
50.51                                      0.250                            0.016
90.00                    01                0.250                            0.016
74.87                                      0.250                            0.016
89.10                    13                0.250                            0.016
60.87                                      0.250                            0.016
80.00                                      0.250                            0.016
75.00                                      0.250                            0.016
80.00                                      0.250                            0.016
90.00                    06                0.250                            0.016
79.99                                      0.250                            0.016
75.00                                      0.250                            0.016
61.36                                      0.250                            0.016
80.00                                      0.250                            0.016
68.76                                      0.250                            0.016
57.24                                      0.250                            0.016
80.00                                      0.250                            0.016
94.44                    01                0.250                            0.016
80.00                                      0.250                            0.016
66.34                                      0.250                            0.016
74.67                                      0.250                            0.016
78.68                                      0.250                            0.016
90.00                    01                0.250                            0.016
79.99                                      0.250                            0.016
71.22                                      0.250                            0.016
</TABLE>                                                           

<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-2
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>      <C>                     <C>   <C>      <C>       <C>       <C>       <C>          <C>       <C>                <C>  
4556938  LAYTON                  UT    84040    SFD       8.125     7.859     $2,247.91    360       1-Feb-27           $302,551.96 
4556964  EASTON                  CT    06612    SFD       8.625     8.359     $2,333.37    360       1-Feb-27           $299,822.88 
4557103  NORFOLK                 VA    23508    SFD       7.750     7.484     $2,149.24    360       1-Feb-27           $299,788.26 
4557434  LITHIA                  FL    33547    SFD       7.875     7.609     $1,720.95    360       1-Jan-27           $236,820.92 
4557535  FOLSOM                  CA    95630    SFD       7.875     7.609     $1,887.72    360       1-Jan-27           $259,990.48 
4557600  HUNTINGTON              NY    11743    SFD       8.250     7.984     $2,034.05    360       1-Feb-27           $270,577.36 
4557675  BERNARDS                NJ    07920    SFD       8.250     7.984     $2,599.38    360       1-Feb-27           $345,779.37 
4557684  MANHATTAN BEACH         CA    90266    SFD       7.750     7.484     $2,579.09    360       1-Feb-27           $359,745.91 
4557686  MAKAWAO                 HI    96768    SFD       7.625     7.359     $2,923.19    360       1-Feb-27           $412,701.08 
4557953  GARDEN CITY             NY    11530    SFD       8.375     8.109     $2,532.94    360       1-Feb-27           $333,042.87 
4558031  BEDFORD                 NY    10506    SFD       7.875     7.609     $5,438.02    360       1-Feb-27           $749,483.86 
4558050  BRIARCLIFF MANOR        NY    10510    SFD       7.875     7.609     $2,349.22    360       1-Feb-27           $322,977.03 
4558061  SPARTA                  NJ    07871    SFD       7.875     7.609     $1,942.83    360       1-Feb-27           $267,765.59 
4558097  SCOTTSDALE              AZ    85255    SFD       8.000     7.734     $2,729.61    360       1-Jan-27           $371,499.12 
4558212  BLOOMFIELD HILLS        MI    48301    SFD       7.750     7.484     $2,865.65    360       1-Feb-27           $399,717.68 
4558222  YARDLEY                 PA    19067    SFD       7.875     7.609     $2,168.69    360       1-Feb-27           $298,894.15 
4558358  DALY CITY               CA    94015    SFD       7.875     7.609     $1,740.17    360       1-Jan-27           $239,668.58 
4558397  ENCINITAS               CA    92024    SFD       7.625     7.359     $2,236.63    360       1-Feb-27           $315,771.29 
4558416  ST GEORGE               UT    84790    SFD       7.875     7.609       $725.07    360       1-Jan-27            $99,861.91 
4558445  CHALFONT                PA    18914    SFD       7.500     7.234     $1,887.18    360       1-Jan-27           $269,498.14 
4558466  MANHASSET               NY    11030    SFD       8.125     7.859     $2,405.70    360       1-Feb-27           $323,788.05 
4558485  SANTA MARIA             CA    93455    SFD       8.000     7.734     $2,329.71    360       1-Feb-27           $317,286.96 
4558523  WOODSTOCK               GA    30188    SFD       7.875     7.609     $2,537.75    360       1-Feb-27           $349,759.13 
4558529  PIEDMONT                CA    94611    SFD       7.750     7.484     $2,005.96    360       1-Feb-27           $279,802.37 
4558688  FAIRFAX                 VA    22030    SFD       7.875     7.609     $1,015.10    360       1-Jan-27           $139,405.36 
4558845  NIPOMO                  CA    93444    SFD       7.625     7.359     $4,600.66    360       1-Feb-27           $649,529.55 
4558874  ANDOVER                 MA    01810    SFD       7.875     7.609     $2,624.76    360       1-Feb-27           $361,750.87 
4559000  IRVINE                  CA    92620    SFD       7.750     7.484     $2,836.28    360       1-Jan-27           $395,339.35 
4559022  HOPKINTON               MA    01748    SFD       7.875     7.609     $2,385.48    360       1-Jan-27           $328,545.69 
4559179  OAKLAND                 CA    94611    SFD       8.250     7.984     $2,644.46    360       1-Feb-27           $351,775.54 
4559210  HARWOOD                 MD    20776    SFD       8.000     7.734     $2,302.93    360       1-Jan-27           $313,427.41 
4559245  CROSS RIVER             NY    10518    LCO       8.500     8.234     $1,045.72    360       1-Jan-27           $135,834.65 
4559330  DARNESTOWN              MD    20874    SFD       8.000     7.734     $3,468.51    360       1-Jan-27           $472,063.54 
4559335  MEDFORD                 NJ    08055    SFD       7.500     7.234     $2,125.62    360       1-Jan-27           $303,547.35 
4559357  CARMEL                  IN    46032    SFD       8.250     7.984     $1,793.81    355       1-Aug-26           $237,683.80 
4559362  POQUOSON                VA    23662    SFD       8.125     7.859     $2,079.00    360       1-Jan-27           $279,632.43 
4559590  ST JAMES                NY    11780    SFD       7.875     7.609     $1,015.10    360       1-Jan-27           $139,806.67 
4559598  TENAFLY                 NJ    07670    SFD       7.875     7.609     $1,859.80    360       1-Jan-27           $256,145.81 
4559615  WASHINGTON              DC    20036    SFD       7.875     7.609     $2,424.64    360       1-Jan-27           $333,938.21 
4559636  MASSAPEQUA              NY    11758    SFD       8.375     8.109     $3,032.69    360       1-Jan-27           $398,502.27 
4559656  SANTA BARBARA           CA    93108    SFD       8.000     7.734     $4,248.50    360       1-Feb-27           $578,611.50 
4559793  GOLDEN                  CO    80403    SFD       7.875     7.609     $2,377.07    240       1-Jan-17           $285,857.53 
4559853  ALPHARETTA              GA    30201    SFD       8.500     8.234     $2,691.20    360       1-Jan-27           $349,574.43 
4559871  KINNELON                NJ    07405    SFD       7.375     7.109     $1,975.34    360       1-Feb-27           $285,782.37 
4559917  RYE                     NY    10580    SFD       7.625     7.359     $2,264.94    360       1-Feb-27           $319,768.39 
4559926  LOS ANGELES             CA    90036    MF2       8.000     7.734     $2,230.65    360       1-Feb-27           $303,796.02 

<CAPTION>

(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C>    
88.78                    17                0.250                            0.016
92.74                                      0.250                            0.016
75.00                                      0.250                            0.016
80.00                                      0.250                            0.016
92.98                    13                0.250                            0.016
95.00                    17                0.250                            0.016
78.64                                      0.250                            0.016
68.18                                      0.250                            0.016
54.13                                      0.250                            0.016
86.95                    17                0.250                            0.016
62.89                                      0.250                            0.016
80.00                                      0.250                            0.016
73.41                                      0.250                            0.016
70.86                                      0.250                            0.016
88.89                    33                0.250                            0.016
79.76                                      0.250                            0.016
87.27                    06                0.250                            0.016
80.00                                      0.250                            0.016
46.51                                      0.250                            0.016
90.00                    17                0.250                            0.016
90.00                                      0.250                            0.016
73.84                                      0.250                            0.016
75.43                                      0.250                            0.016
80.00                                      0.250                            0.016
58.33                                      0.250                            0.016
59.09                                      0.250                            0.016
80.00                                      0.250                            0.016
89.99                    17                0.250                            0.016
62.08                                      0.250                            0.016
85.85                                      0.250                            0.016
75.99                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
79.98                                      0.250                            0.016
77.78                                      0.250                            0.016
62.22                                      0.250                            0.016
90.00                    12                0.250                            0.016
80.00                                      0.250                            0.016
85.81                    13                0.250                            0.016
68.12                                      0.250                            0.016
71.71                                      0.250                            0.016
89.90                    13                0.250                            0.016
75.26                                      0.250                            0.016
80.00                                      0.250                            0.016
78.96                                      0.250                            0.016
</TABLE>                                                                


<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-2
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>      <C>                     <C>   <C>      <C>       <C>       <C>       <C>          <C>       <C>                <C>  
4560012  BRONXVILLE              NY    10708    SFD       7.625     7.359     $2,022.88    360       1-Feb-27           $285,593.14 
4560091  SANIBEL                 FL    33957    SFD       7.875     7.609     $4,350.42    360       1-Feb-27           $599,587.08 
4560208  ALEXANDRIA              VA    22315    SFD       7.750     7.484     $1,826.85    360       1-Jan-27           $254,638.89 
4560226  SAN DIEGO               CA    92107    SFD       7.875     7.609     $2,141.13    360       1-Feb-27           $295,096.78 
4560261  SCOTTSDALE              AZ    85259    SFD       8.125     7.859     $1,268.56    360       1-Jan-27           $170,625.72 
4560312  GREENWOOD               IN    46143    SFD       8.250     7.984     $2,129.84    360       1-Jan-27           $283,137.19 
4560338  TOPANGA                 CA    90290    SFD       8.000     7.734     $2,011.95    360       1-Jan-27           $273,825.81 
4560357  DUBLIN                  OH    43017    SFD       7.875     7.609     $2,073.70    360       1-Feb-27           $285,803.18 
4560458  BERKELEY                CA    94708    SFD       8.250     7.984     $2,156.14    360       1-Feb-27           $286,816.99 
4560479  THOUSAND OAKS           CA    91320    SFD       7.625     7.359     $1,465.13    360       1-Jan-27           $206,699.42 
4560481  SEATTLE                 WA    98199    SFD       7.750     7.484     $2,199.39    360       1-Feb-27           $306,783.32 
4560547  NORCROSS                GA    30092    SFD       8.250     7.984     $1,596.07    360       1-Jan-27           $212,178.12 
4560579  LAKE QUIVERA            KS    66106    SFD       7.780     7.514     $2,327.90    360       1-Jan-27           $323,543.93 
4560659  SAN JOSE                CA    95129    SFD       7.750     7.484     $2,256.70    360       1-Feb-27           $314,777.67 
4560700  TUCSON                  AZ    85746    SFD       8.250     7.984       $576.98    360       1-Jan-27            $76,395.60 
4560729  NORCO                   CA    91760    SFD       7.875     7.609     $1,957.69    360       1-Feb-27           $269,814.19 
4560807  IRVINE                  CA    92620    SFD       7.750     7.484     $2,004.16    360       1-Feb-27           $279,552.56 
4560810  MADISON                 GA    30650    SFD       7.625     7.359     $3,515.97    360       1-Jan-27           $496,028.65 
4560842  SAYVILLE                NY    11782    SFD       7.750     7.484     $2,077.60    360       1-Feb-27           $289,795.32 
4560873  CRANBURY                NJ    08512    SFD       8.125     7.859     $2,247.92    360       1-Feb-27           $302,551.95 
4560908  ATLANTA                 GA    30327    SFD       7.750     7.484     $2,973.11    360       1-Jan-27           $414,412.31 
4560919  VIRGINIA BEACH          VA    23451    SFD       7.750     7.484     $2,672.58    360       1-Feb-27           $372,786.70 
4560946  SEATTLE                 WA    98115    SFD       8.000     7.734     $1,836.61    360       1-Jan-27           $249,963.00 
4561001  CANTON                  MA    02021    SFD       7.875     7.609     $2,900.28    360       1-Jan-27           $399,447.63 
4561002  FAIRFAX                 VA    22032    SFD       8.125     7.859     $1,900.80    360       1-Jan-27           $255,663.93 
4561014  CARBONDALE              CO    81623    SFD       7.750     7.484     $2,478.79    360       1-Feb-27           $345,755.79 
4561022  KNOXVILLE               TN    37922    SFD       7.750     7.484     $2,202.97    360       1-Feb-27           $307,282.97 
4561122  SAN ANTONIO             TX    78212    SFD       8.125     7.859     $2,966.28    360       1-Jan-27           $398,975.57 
4561173  FT. LAUDERDALE          FL    33332    SFD       7.750     7.484     $2,951.62    360       1-Jan-27           $411,416.56 
4561241  BELLEVUE                WA    98004    SFD       7.625     7.359     $1,988.91    360       1-Feb-27           $280,796.61 
4561252  LONGMONT                CO    80503    SFD       8.000     7.734     $2,792.34    360       1-Jan-27           $380,037.62 
4561322  CINCINNATI              OH    45248    SFD       8.125     7.859     $2,044.47    360       1-Feb-27           $275,169.88 
4561323  SOUTHLAKE               TX    76092    SFD       8.125     7.859     $2,071.57    360       1-Feb-27           $278,817.49 
4561343  GERMANTOWN              TN    38139    SFD       7.875     7.609     $1,962.04    360       1-Feb-27           $270,413.77 
4561351  HAMILTON                MA    01936    SFD       8.125     7.859     $1,630.53    360       1-Jan-27           $219,216.48 
4561355  MISSOURI CITY           TX    77459    SFD       7.250     6.984     $1,637.23    360       1-Jan-27           $239,624.41 
4561358  PHILADELPHIA            PA    19115    LCO       9.000     8.734       $579.33    360       1-Jan-27            $71,921.05 
4561371  ATLANTA                 GA    30327    SFD       8.250     7.984     $2,238.77    360       1-Jan-27           $297,618.65 
4561406  OLD HICKORY             TN    37138    SFD       7.875     7.609     $1,943.19    360       1-Feb-27           $267,815.56 
4561469  DAYTONA BEACH           FL    32118    SFD       7.875     7.609     $4,141.96    360       1-Feb-27           $570,856.87 
4561516  WAYLAND                 MA    01778    SFD       8.125     7.859     $3,140.77    360       1-Feb-27           $422,723.29 
4561522  CLAYTON                 GA    30525    SFD       8.250     7.984     $1,502.54    360       1-Jan-27           $199,744.04 
4561526  HUNTINGTON BEACH        CA    92648    SFD       8.125     7.859     $4,336.19    360       1-Feb-27           $583,617.98 
4561555  SUPERIOR                CO    80027    SFD       7.875     7.609     $2,082.40    360       1-Jan-27           $286,803.40 
4561659  PORTLAND                OR    97236    SFD       7.750     7.484     $1,977.30    360       1-Feb-27           $275,805.20 
4561717  STREET                  MD    21154    SFD       7.750     7.484     $1,751.99    360       1-Jan-27           $244,203.67 

<CAPTION>

(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C>    
80.00                                      0.250                            0.016 
69.77                                      0.250                            0.016 
73.35                                      0.250                            0.016 
77.71                                      0.250                            0.016 
79.98                                      0.250                            0.016 
90.00                    06                0.250                            0.016 
89.90                    11                0.250                            0.016 
79.33                                      0.250                            0.016 
74.55                                      0.250                            0.016 
78.26                                      0.250                            0.016 
63.69                                      0.250                            0.016 
79.99                                      0.250                            0.016 
79.02                                      0.250                            0.016 
68.48                                      0.250                            0.016 
80.00                                      0.250                            0.016 
83.08                    33                0.250                            0.016 
85.00                    11                0.250                            0.016 
74.70                                      0.250                            0.016 
68.24                                      0.250                            0.016 
77.63                                      0.250                            0.016 
62.41                                      0.250                            0.016 
89.99                    33                0.250                            0.016 
78.71                                      0.250                            0.016 
72.73                                      0.250                            0.016 
78.53                                      0.250                            0.016 
67.84                                      0.250                            0.016 
75.00                                      0.250                            0.016 
86.85                    01                0.250                            0.016 
78.03                                      0.250                            0.016 
63.86                                      0.250                            0.016 
89.99                    12                0.250                            0.016 
95.00                    12                0.250                            0.016 
94.84                    12                0.250                            0.016 
74.14                                      0.250                            0.016 
90.00                    33                0.250                            0.016 
76.19                                      0.250                            0.016 
80.00                                      0.250                            0.016 
76.41                                      0.250                            0.016 
80.00                                      0.250                            0.016 
71.86                                      0.250                            0.016 
56.40                                      0.250                            0.016 
80.00                                      0.250                            0.016 
80.00                                      0.250                            0.016 
90.00                    06                0.250                            0.016 
80.00                                      0.250                            0.016 
80.00                                      0.250                            0.016 
</TABLE>                                                                


<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-2
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>      <C>                     <C>   <C>      <C>       <C>       <C>       <C>          <C>       <C>                <C>  
4561738  MADISON                 NJ    07940    SFD       8.000     7.734     $2,274.68    360       1-Feb-27           $309,791.99 
4561828  MALIBU                  CA    90265    SFD       7.875     7.609     $3,081.55    360       1-Feb-27           $424,707.51 
4561834  LOS ANGELES             CA    90036    SFD       8.000     7.734     $2,193.59    360       1-Feb-27           $298,749.41 
4561851  ARLINGTON               WA    98223    SFD       7.750     7.484     $1,834.02    360       1-Jan-27           $255,637.46 
4561862  HUDSONVILLE             MI    49426    SFD       8.500     8.234     $1,845.39    360       1-Jan-27           $239,708.19 
4561864  COPPELL                 TX    75019    SFD       7.750     7.484     $2,034.61    360       1-Jan-27           $283,597.82 
4561940  VILLA PARK              CA    92861    SFD       7.875     7.609     $2,871.28    360       1-Feb-27           $395,727.47 
4562031  SIMI VALLEY             CA    93063    SFD       8.125     7.859     $2,004.75    360       1-Feb-27           $269,823.37 
4562066  MISSION VIEJO           CA    92691    SFD       7.625     7.359     $1,889.81    360       1-Feb-27           $266,789.81 
4562067  MECHANICSBURG           PA    17055    SFD       8.250     7.984     $2,629.44    360       1-Jan-27           $349,552.09 
4562117  LOS ALTOS HILLS         CA    94022    SFD       7.750     7.484     $4,524.15    360       1-Feb-27           $631,054.29 
4562277  GREENWICH               CT    06830    SFD       7.875     7.609     $2,537.75    360       1-Feb-27           $349,659.13 
4562290  PACIFIC PALISADES       CA    90272    SFD       7.875     7.609     $2,102.71    360       1-Feb-27           $289,800.42 
4562369  TOWN AND COUNTRY        MO    63017    SFD       7.875     7.609     $3,589.10    360       1-Feb-27           $494,659.34 
4562379  ROLLING HILLS ESTATE    CA    90274    SFD       7.875     7.609     $3,444.08    360       1-Feb-27           $471,338.01 
4562407  WINDSOR                 VT    05089    SFD       8.250     7.984     $3,434.80    360       1-Feb-27           $456,908.45 
4562418  SAN MATEO               CA    94402    SFD       8.000     7.734     $3,668.83    360       1-Feb-27           $499,664.50 
4562630  DULUTH                  GA    30136    SFD       7.750     7.484     $2,149.24    360       1-Jan-27           $299,575.15 
4562634  WEST MOUNTAIN           UT    84651    SFD       8.125     7.859     $2,032.59    360       1-Jan-27           $273,390.64 
4562657  LONG VALLEY             NJ    07853    SFD       8.625     8.359     $2,566.71    360       1-Feb-27           $329,805.17 
4562662  LAS VEGAS               NV    89129    SFD       7.750     7.484     $1,669.24    360       1-Jan-27           $232,570.37 
4562670  BELLEAIR                FL    34616    SFD       7.875     7.609     $1,937.39    360       1-Feb-27           $266,581.46 
4562696  DANVILLE                CA    94506    PUD       8.125     7.859     $2,301.75    360       1-Feb-27           $309,797.21 
4562746  PRINCE FREDERICK        MD    20678    SFD       7.875     7.609     $1,985.24    360       1-Feb-27           $273,611.57 
4562778  SUWANEE                 GA    30174    SFD       7.875     7.609     $1,757.57    360       1-Jan-27           $242,065.27 
4562779  LOS ANGELES             CA    90035    SFD       8.000     7.734     $3,668.83    360       1-Feb-27           $499,664.50 
4562863  OAKTON                  VA    22124    SFD       7.625     7.359     $1,725.25    360       1-Jan-27           $243,396.04 
4562868  SACRAMENTO              CA    95864    SFD       8.125     7.859     $2,450.24    360       1-Jan-27           $328,411.07 
4562899  SARATOGA                CA    95070    SFD       8.250     7.984     $2,629.43    360       1-Feb-27           $349,776.82 
4562909  TUCSON                  AZ    85749    SFD       7.875     7.609     $2,563.12    360       1-Jan-27           $353,011.86 
4562916  TUCSON                  AZ    85749    PUD       8.000     7.734     $2,218.91    360       1-Feb-27           $302,197.09 
4562917  TUCSON                  AZ    85718    PUD       7.875     7.609     $1,940.29    360       1-Feb-27           $267,415.84 
4562938  FAIRFIELD               CT    06430    SFD       7.250     6.984     $1,582.65    360       1-Dec-26           $231,453.76 
4562996  MURPHYS                 CA    95247    SFD       8.375     8.109     $3,040.29    360       1-Feb-27           $399,751.38 
4563112  WESTPORT                CT    06880    SFD       7.625     7.359     $2,406.50    360       1-Feb-27           $339,753.92 
4563144  CHICAGO                 IL    60646    SFD       8.000     7.734     $2,531.49    360       1-Feb-27           $344,768.51 
4563195  PHOENIX                 AZ    85018    PUD       7.875     7.609     $3,148.62    360       1-Jan-27           $433,650.33 
4563199  FORT COLLINS            CO    80525    PUD       7.750     7.484     $1,791.04    360       1-Jan-27           $249,645.95 
4563206  LACANADA-FLINTRIDGE     CA    91011    SFD       8.250     7.984     $3,621.11    360       1-Jan-27           $479,774.30 
4563217  IRVINE                  CA    92620    PUD       7.500     7.234     $1,843.83    360       1-Jan-27           $263,307.37 
4563221  IRVINE                  CA    92620    SFD       7.750     7.484     $2,039.63    360       1-Feb-27           $284,499.06 
4563222  FRAMINGHAM              MA    01701    SFD       8.375     8.109     $2,325.82    360       1-Dec-26           $305,425.42 
4563229  CORPUS CHRISTI          TX    78404    SFD       8.000     7.734     $2,034.00    360       1-Jan-27           $276,826.76 
4563261  VIENNA                  VA    22182    SFD       7.625     7.359     $2,264.94    360       1-Feb-27           $319,768.39 
4563264  MILL CREEK              WA    98012    SFD       7.875     7.609     $3,306.32    360       1-Jan-27           $455,370.30 
4563308  SUGAR LAND              TX    77479    SFD       7.875     7.609     $3,625.35    360       1-Feb-27           $499,655.90 

<CAPTION>

(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C>    
48.82                                      0.250                            0.016
68.00                                      0.250                            0.016
79.93                                      0.250                            0.016
67.37                                      0.250                            0.016
66.67                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
90.00                    33                0.250                            0.016
78.53                                      0.250                            0.016
66.67                                      0.250                            0.016
69.99                                      0.250                            0.016
51.85                                      0.250                            0.016
41.43                                      0.250                            0.016
79.76                                      0.250                            0.016
76.00                                      0.250                            0.016
90.00                    33                0.250                            0.016
65.79                                      0.250                            0.016
78.95                                      0.250                            0.016
75.00                                      0.250                            0.016
73.33                                      0.250                            0.016
90.00                    06                0.250                            0.016
80.00                                      0.250                            0.016
77.50                                      0.250                            0.016
75.64                                      0.250                            0.016
94.90                    13                0.250                            0.016
74.07                                      0.250                            0.016
75.00                                      0.250                            0.016
69.92                                      0.250                            0.016
25.93                                      0.250                            0.016
70.00                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
75.00                                      0.250                            0.016
78.95                                      0.250                            0.016
64.10                                      0.250                            0.016
74.15                                      0.250                            0.016
79.99                                      0.250                            0.016
80.00                                      0.250                            0.016
90.00                    01                0.250                            0.016
90.00                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
78.13                                      0.250                            0.016
</TABLE>                                                                 

<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-2
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>      <C>                     <C>   <C>      <C>       <C>       <C>       <C>          <C>       <C>                <C>  
4563349  SIMI VALLEY             CA    93065    SFD       8.000     7.734     $2,766.30    360       1-Feb-27           $376,747.03 
4563396  NORFOLK                 VA    23503    SFD       7.375     7.109     $1,933.90    360       1-Feb-27           $279,786.93 
4563412  WEST NEWTON             MA    02165    SFD       7.500     7.234     $2,724.14    360       1-Feb-27           $389,310.86 
4563431  MANHATTAN BEACH         CA    90266    SFD       8.000     7.734     $5,870.12    360       1-Feb-27           $799,463.21 
4563453  OAKLAND                 CA    94602    SFD       7.625     7.359     $1,698.71    360       1-Jan-27           $239,651.48 
4563521  CARLSBAD                CA    92009    SFD       7.750     7.484     $2,142.08    360       1-Feb-27           $298,788.96 
4563551  BEVERLY HILLS           CA    90211    SFD       8.250     7.984     $2,426.60    360       1-Feb-27           $322,794.03 
4563574  SALT LAKE CITY          UT    84121    SFD       7.875     7.609     $1,966.39    360       1-Jan-27           $270,825.50 
4563596  SAN DIEGO               CA    92127    PUD       8.250     7.984     $2,049.46    360       1-Feb-27           $272,626.04 
4563599  SANTA ROSA              CA    95405    SFD       7.750     7.484     $1,776.71    360       1-Jan-27           $247,648.79 
4563600  KIRKLAND                WA    98034    SFD       7.875     7.609     $2,537.75    360       1-Feb-27           $349,759.13 
4563637  MIAMI                   FL    33183    SFD       8.250     7.984     $1,922.50    360       1-Jan-27           $254,368.39 
4563643  WASHINGTON              DC    20015    SFD       8.625     8.359     $2,401.31    240       1-Feb-17           $273,769.50 
4563649  CHARLESTON              SC    29407    SFD       7.875     7.609     $2,175.21    360       1-Jan-27           $299,585.73 
4563688  NEW ROCHELLE            NY    10804    SFD       8.000     7.734     $3,199.22    360       1-Feb-27           $435,707.45 
4563692  CINCINNATI              OH    45241    SFD       8.625     8.359     $2,638.27    360       1-Feb-27           $338,999.73 
4563718  LOS ANGELES             CA    90035    SFD       7.750     7.484     $2,292.52    360       1-Feb-27           $319,774.15 
4563755  WAYNE                   NJ    07470    PUD       7.875     7.609     $1,446.52    360       1-Jan-27           $199,224.50 
4563763  RAMSEY                  MN    55303    SFD       7.750     7.484     $2,149.24    360       1-Feb-27           $299,788.26 
4563782  LAKE OSWEGO             OR    97035    PUD       7.875     7.609     $1,780.05    360       1-Jan-27           $245,160.97 
4563856  WESTON                  MA    02193    SFD       7.875     7.609     $3,603.59    360       1-Jan-27           $496,313.71 
4563865  HASTINGS-ON-HUDSON      NY    10706    SFD       8.375     8.109     $3,006.47    360       1-Feb-27           $395,304.14 
4563901  LOS ANGELES             CA    90035    SFD       7.875     7.609     $2,784.27    360       1-Feb-27           $383,735.73 
4563924  MENLO PARK              CA    94025    SFD       8.250     7.984     $5,634.50    360       1-Feb-27           $749,521.75 
4564016  JACKSON HEIGHTS         NY    11370    SFD       8.750     8.484     $1,359.42    360       1-Jan-27           $172,600.44 
4564091  FORT LAUDERDALE         FL    33327    SFD       8.000     7.734     $2,274.68    360       1-Feb-27           $309,791.99 
4564223  SACRAMENTO              CA    95864    SFD       8.250     7.984     $2,354.68    353       1-May-26           $291,461.64 
4564231  ASHBURN                 VA    20147    SFD       7.875     7.609     $1,876.48    360       1-Jan-27           $258,442.63 
4564257  VACAVILLE               CA    95688    SFD       8.375     8.109     $1,757.67    360       1-Jan-27           $230,961.52 
4564262  LAFAYETTE               CA    94549    SFD       8.000     7.734     $2,494.80    360       1-Feb-27           $339,771.87 
4564277  TAMPA                   FL    33618    SFD       7.875     7.609     $2,320.23    360       1-Feb-27           $319,779.77 
4564296  DALY CITY               CA    94015    SFD       8.375     8.109     $1,877.38    360       1-Jan-27           $246,691.88 
4564297  PEBBLE BEACH            CA    93953    SFD       7.750     7.484     $2,507.45    360       1-Feb-27           $349,252.97 
4564299  LAKE FOREST             IL    60045    SFD       8.000     7.734     $4,769.47    360       1-Feb-27           $649,563.86 
4564365  HERNDON                 VA    20170    SFD       7.625     7.359     $1,911.04    360       1-Jan-27           $269,607.93 
4564367  FAIRFAX                 VA    22033    SFD       7.500     7.234     $1,660.63    360       1-Jan-27           $237,146.39 
4564408  DELRAY BEACH            FL    33446    SFD       7.875     7.609     $3,444.08    360       1-Feb-27           $474,673.11 
4564453  GREAT FALLS             VA    22066    SFD       8.125     7.859     $2,435.39    360       1-Jan-27           $327,569.44 
4564460  SAN MATEO               CA    94402    SFD       7.625     7.359     $3,538.97    360       1-Feb-27           $499,638.11 
4564571  PLANO                   TX    75093    SFD       8.125     7.859     $1,661.71    360       1-Jan-27           $223,506.22 
4564633  REDONDO BEACH           CA    90278    LCO       8.000     7.734     $1,714.07    360       1-Jan-27           $233,285.49 
4564663  HACIENDA HEIGHTS        CA    91745    SFD       7.750     7.484     $1,576.11    360       1-Jan-27           $219,688.44 
4564759  SARATOGA                CA    95070    SFD       9.250     8.984         $0.00    360       1-Feb-27           $423,780.18 
4564780  CAMARILLO               CA    93012    PUD       7.875     7.609     $2,610.25    360       1-Feb-27           $359,752.25 
4564920  ALEXANDRIA              VA    22309    SFD       7.875     7.609     $1,925.06    360       1-Jan-27           $265,133.37 
4565006  SCOTTSDALE              AZ    85259    PUD       8.000     7.734     $2,566.71    360       1-Jan-27           $349,285.24 

<CAPTION>

(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C>    
79.37                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
59.26                                      0.250                            0.016
83.04                    12                0.250                            0.016
77.06                                      0.250                            0.016
76.00                                      0.250                            0.016
80.00                                      0.250                            0.016
83.94                    33                0.250                            0.016
67.03                                      0.250                            0.016
55.12                                      0.250                            0.016
79.99                                      0.250                            0.016
79.48                                      0.250                            0.016
75.00                                      0.250                            0.016
80.00                                      0.250                            0.016
79.81                                      0.250                            0.016
69.57                                      0.250                            0.016
67.97                                      0.250                            0.016
80.00                                      0.250                            0.016
77.95                                      0.250                            0.016
55.84                                      0.250                            0.016
90.00                                      0.250                            0.016
80.00                                      0.250                            0.016
61.22                                      0.250                            0.016
80.00                                      0.250                            0.016
74.34                                      0.250                            0.016
80.00                                      0.250                            0.016
79.63                                      0.250                            0.016
89.98                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
95.00                    12                0.250                            0.016
59.83                                      0.250                            0.016
66.67                                      0.250                            0.016
80.00                                      0.250                            0.016
76.61                                      0.250                            0.016
55.78                                      0.250                            0.016
80.00                                      0.250                            0.016
50.05                                      0.250                            0.016
75.00                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
90.00                    13                0.250                            0.016
63.60                                      0.250                            0.016
</TABLE>                                                       

<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-2
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>      <C>                     <C>   <C>      <C>       <C>       <C>       <C>          <C>       <C>                <C>  
4565007  LIVERMORE               CA    94550    SFD       7.750     7.484     $2,779.68    360       1-Feb-27           $387,655.79 
4565031  PACIFIC PALISADES       CA    90272    SFD       7.625     7.359     $2,123.39    360       1-Feb-27           $299,782.86 
4565129  SUNNYVALE               CA    94087    SFD       8.125     7.859     $2,165.49    360       1-Feb-27           $291,459.22 
4565142  LOS ANGELES             CA    90064    SFD       7.875     7.609     $2,827.78    360       1-Feb-27           $389,731.60 
4565265  SAN FRANCISCO           CA    94117    MF2       7.750     7.484     $2,077.60    360       1-Feb-27           $289,795.32 
4565273  TENAFLY                 NJ    07670    SFD       8.250     7.984     $2,464.16    360       1-Feb-27           $327,790.84 
4565340  GREENWOOD               IN    46143    SFD       8.500     8.234     $3,033.36    360       1-Jan-27           $394,020.34 
4565385  SEATTLE                 WA    98118    SFD       8.000     7.734     $2,348.05    360       1-Jan-27           $319,569.14 
4565501  SAN JOSE                CA    95126    SFD       8.125     7.859     $2,720.51    360       1-Feb-27           $365,860.32 
4565552  CUPERTINO               CA    95014    SFD       8.875     8.609     $3,326.80    360       1-Feb-27           $417,890.58 
4565637  CARLSBAD                CA    92009    SFD       8.000     7.734     $1,834.41    360       1-Jan-27           $249,663.40 
4565679  EL DORADO HILLS         CA    95762    SFD       7.750     7.484     $2,291.81    360       1-Feb-27           $319,674.21 
4565694  COLORADO SPRINGS        CO    80906    SFD       8.375     8.109       $380.04    360       1-Jan-27            $49,937.62 
4565705  ISSAQUAH                WA    98029    SFD       8.000     7.734     $1,761.03    360       1-Jan-27           $239,676.87 
4565745  NEW ORLEANS             LA    70124    SFD       8.125     7.859     $2,227.50    360       1-Feb-27           $299,803.75 
4565814  ANCHORAGE               AK    99508    SFD       8.250     7.984     $3,485.88    360       1-Jan-27           $463,406.21 
4565880  SCOTTSDALE              AZ    85259    SFD       7.750     7.484     $2,657.89    360       1-Jan-27           $370,474.62 
4565911  MONUMENT                CO    80132    SFD       8.000     7.734     $2,083.90    360       1-Feb-27           $283,809.43 
4565987  KINGS POINT             NY    11024    SFD       8.000     7.734     $3,191.88    360       1-Feb-27           $434,708.12 
4566073  REDLANDS                CA    92373    SFD       7.875     7.609     $1,637.93    360       1-Jan-27           $225,489.53 
4566322  FALLS CHURCH            VA    22043    SFD       8.250     7.984     $2,197.45    360       1-Jan-27           $292,125.70 
4566363  ST. PAUL                MN    55102    SFD       8.125     7.859       $582.12    360       1-Jan-27            $78,297.09 
4566417  NAPLES                  FL    33964    SFD       7.875     7.609       $620.66    360       1-Jan-27            $85,481.79 
4566458  NEWTON                  MA    02168    SFD       7.875     7.609     $4,132.90    360       1-Feb-27           $569,607.73 
4566571  DRAPER                  UT    84020    SFD       8.500     8.234     $2,005.33    360       1-Jan-27           $260,482.89 
4566600  WEST TISBURY            MA    02575    SFD       7.375     7.109     $1,813.02    360       1-Jan-27           $262,099.30 
4566766  SAN JUAN CAPISTRANO     CA    92675    SFD       8.125     7.859     $2,598.75    360       1-Feb-27           $349,771.04 
4566924  LOS GATOS               CA    95030    SFD       7.750     7.484     $2,256.70    360       1-Feb-27           $314,777.67 
4567317  HALF MOON BAY           CA    94019    SFD       8.000     7.734     $2,285.68    360       1-Feb-27           $311,290.99 
4567362  ORANGE                  CA    92667    SFD       8.500     8.234     $3,014.14    360       1-Feb-27           $391,762.53 
4567363  SAN FRANCISCO           CA    94107    LCO       8.125     7.859     $1,995.83    360       1-Feb-27           $268,624.17 
4567475  WESTPORT                CT    06880    SFD       8.250     7.984     $3,121.52    360       1-Feb-27           $415,235.04 
4567551  NORTHRIDGE AREA         CA    91326    SFD       8.250     7.984     $1,818.07    360       1-Jan-27           $241,690.30 
4567608  LOPEZ ISLAND            WA    98261    SFD       8.000     7.734     $3,386.32    360       1-Jan-27           $460,878.63 
4567710  LOS ANGELES             CA    90049    LCO       8.375     8.109     $2,280.22    360       1-Feb-27           $299,813.53 
4567729  ANAHEIM                 CA    92808    PUD       8.000     7.734     $2,113.25    360       1-Feb-27           $287,806.75 
4567756  TACOMA                  WA    98422    SFD       8.625     8.359     $1,622.47    360       1-Jan-27           $208,352.81 
4567790  PORTLAND                OR    97229    SFD       7.500     7.234     $2,399.71    360       1-Feb-27           $342,945.29 
4567791  YORBA LINDA             CA    92686    SFD       8.000     7.734     $1,900.46    360       1-Jan-27           $258,651.26 
4567932  VIENNA                  VA    22182    SFD       7.375     7.109     $2,806.56    360       1-Feb-27           $406,040.80 
4567943  CENTERVILLE             UT    84014    SFD       8.000     7.734     $2,091.23    360       1-Feb-27           $284,808.77 
4567979  DENVER                  CO    80223    SFD       8.375     8.109       $498.61    360       1-Jan-27            $65,518.17 
4568089  ENCINITAS               CA    92007    SFD       8.125     7.859     $2,969.99    360       1-Jan-27           $399,474.92 
4568109  SAN FRANCISCO           CA    94116    SFD       8.375     8.109       $532.06    360       1-Jan-27            $69,912.67 
4568121  MILTON                  WA    98354    SFD       8.375     8.109     $2,295.42    360       1-Jan-27           $301,623.27 
4568134  CASTLE ROCK             CO    80104    SFD       8.250     7.984     $2,253.80    360       1-Jan-27           $299,616.08 

<CAPTION>

(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C>    
80.00                                      0.250                            0.016
48.00                                      0.250                            0.016
95.00                    11                0.250                            0.016
62.40                                      0.250                            0.016
69.21                                      0.250                            0.016
74.55                                      0.250                            0.016
80.00                                      0.250                            0.016
79.01                                      0.250                            0.016
80.00                                      0.250                            0.016
75.00                                      0.250                            0.016
59.23                                      0.250                            0.016
79.99                                      0.250                            0.016
76.92                                      0.250                            0.016
70.59                                      0.250                            0.016
75.00                                      0.250                            0.016
68.74                                      0.250                            0.016
79.96                                      0.250                            0.016
80.00                                      0.250                            0.016
74.36                                      0.250                            0.016
90.00                    12                0.250                            0.016
75.00                                      0.250                            0.016
80.00                                      0.250                            0.016
78.53                                      0.250                            0.016
75.00                                      0.250                            0.016
80.00                                      0.250                            0.016
70.19                                      0.250                            0.016
63.64                                      0.250                            0.016
76.83                                      0.250                            0.016
70.00                                      0.250                            0.016
80.00                                      0.250                            0.016
80.00                                      0.250                            0.016
75.00                                      0.250                            0.016
86.43                    06                0.250                            0.016
75.66                                      0.250                            0.016
40.38                                      0.250                            0.016
80.00                                      0.250                            0.016
70.00                                      0.250                            0.016
80.00                                      0.250                            0.016
84.92                    13                0.250                            0.016
79.99                                      0.250                            0.016
68.63                                      0.250                            0.016
80.00                                      0.250                            0.016
72.73                                      0.250                            0.016
27.45                                      0.250                            0.016
88.82                    11                0.250                            0.016
48.00                                      0.250                            0.016
</TABLE>                                                         

<PAGE>

NASCOR
NMI / 1997-4  Exhibit F-2
30 YEAR FIXED RATE NON-RELOCATION LOANS

<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     --------------------- -----   ----    --------  --------  --------  ----------   --------  ----------         ----------- 
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  --------------------- -----   ----    --------  --------  --------  ----------   --------  -----------        ----------- 
<S>      <C>                     <C>   <C>      <C>       <C>       <C>       <C>          <C>       <C>                <C>  
4568146  SAN JUAN CAPISTRANO     CA    92675    SFD       8.125     7.859     $2,088.27    360       1-Jan-27           $280,880.81 
4568476  LAFAYETTE               CA    94549    SFD       7.875     7.609     $2,900.28    360       1-Feb-27           $399,724.72 
4568649  CORONADO                CA    92118    SFD       8.250     7.984     $3,125.27    360       1-Feb-27           $415,734.73 
4568660  SAN DIEGO               CA    92121    PUD       7.750     7.484     $1,933.60    360       1-Jan-27           $269,517.78 
4568668  FAIRFAX STATION         VA    22039    SFD       7.875     7.609     $2,231.41    360       1-Jan-27           $307,325.01 
4568680  HERNDON                 VA    22071    PUD       7.375     7.109     $2,192.90    360       1-Jan-27           $317,015.33 
4568684  SAN DIEGO               CA    92128    PUD       7.250     6.984     $1,657.35    360       1-Jan-27           $242,569.81 
4568708  GAINESVILLE             VA    20155    SFD       7.625     7.359     $1,859.73    360       1-Jan-27           $262,368.45 
4568717  SAN DIEGO               CA    92128    PUD       7.625     7.359     $1,756.04    360       1-Jan-27           $247,739.72 
4568721  SAN DIEGO               CA    92121    SFD       7.750     7.484     $1,670.68    360       1-Jan-27           $232,869.75 
4568831  VILLA PARK              CA    92861    SFD       8.250     7.984     $2,253.80    360       1-Feb-27           $296,808.70 
4568836  SCOTTSDALE              AZ    85254    PUD       8.250     7.984     $5,769.73    360       1-Feb-27           $767,510.27 
4568860  HUNTLEY                 IL    60142    SFD       7.625     7.359     $1,579.80    360       1-Jan-27           $222,875.87 
4568901  HUNTINGTON BEACH        CA    92649    SFD       8.125     7.859     $1,848.82    360       1-Jan-27           $248,673.13 
4569102  VIRGINIA BEACH          VA    23451    SFD       8.000     7.734     $2,054.54    360       1-Feb-27           $279,812.13 
4569133  SALT LAKE CITY          UT    84109    PUD       8.000     7.734     $2,641.56    360       1-Feb-27           $359,758.44 
4569144  SAN JOSE                CA    95120    SFD       7.750     7.484     $2,435.81    360       1-Jan-27           $339,518.50 
4569150  LUTZ                    FL    33549    SFD       7.750     7.484     $2,041.42    360       1-Jan-27           $284,546.47 
4569155  VALENCIA                CA    91354    PUD       7.250     6.984     $1,657.01    360       1-Dec-26           $242,054.09 
4569164  CARSON                  CA    90745    SFD       8.125     7.859     $1,697.35    360       1-Jan-27           $228,299.92 
4569165  IRVINE                  CA    92620    PUD       7.750     7.484     $2,122.73    360       1-Jan-27           $295,880.40 
4569173  COLORADO SPRINGS        CO    80919    PUD       7.750     7.484     $2,195.09    360       1-Jan-27           $305,966.10 
4569182  MILPITAS                CA    95035    SFD       7.875     7.609     $2,913.33    360       1-Jan-27           $401,245.16 
4569183  VALENCIA                CA    91354    PUD       7.625     7.359     $1,722.42    360       1-Jan-27           $242,996.62 
4569196  SIMI VALLEY             CA    93065    SFD       7.750     7.484     $2,378.49    360       1-Jan-27           $331,529.84 
4569199  SANTA BARBARA           CA    93103    SFD       7.875     7.609     $1,631.41    360       1-Dec-26           $224,532.40 
4569202  SAN JOSE                CA    95135    SFD       7.625     7.359     $2,010.14    360       1-Jan-27           $283,587.59 
4569451  PALOS VERDES            CA    90274    SFD       8.000     7.734     $2,905.71    360       1-Feb-27           $395,734.29 
4569457  NEWPORT COAST AREA      CA    92657    SFD       7.875     7.609     $2,537.74    360       1-Jan-27           $349,516.69 
4569495  WOODBURY                NY    11797    SFD       8.000     7.734     $2,311.36    360       1-Feb-27           $314,788.64 
4569498  SAN FRANCISCO           CA    94127    SFD       8.375     8.109     $2,515.84    360       1-Feb-27           $330,794.26 
4569506  CAMARILLO               CA    93012    SFD       8.375     8.109     $2,097.80    360       1-Jan-27           $275,655.70 
4569512  SAN CLEMENTE            CA    92672    SFD       8.250     7.984     $2,569.34    360       1-Feb-27           $341,781.91 
4569711  LONGVIEW                WA    98632    SFD       8.375     8.109     $1,748.17    360       1-Oct-26           $229,275.14 
4570396  SAN JOSE                CA    95132    SFD       8.125     7.859     $1,987.67    360       1-Feb-27           $267,524.88 
                                                                                                                                    
                                                                                                                    $112,943,574.71
COUNT:                   357
WAC:             8.020450428
WAM:             357.6427845
WALTV:           75.72324711

<CAPTION>

(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)         
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE      
LTV       SUBSIDY        CODE              FEE            LOAN              FEE          
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C>    
75.00                                      0.250                            0.016
53.92                                      0.250                            0.016
80.00                                      0.250                            0.016
90.00                    12                0.250                            0.016
80.00                                      0.250                            0.016
89.99                    06                0.250                            0.016
85.00                    01                0.250                            0.016
90.00                    12                0.250                            0.016
69.99                                      0.250                            0.016
85.00                    01                0.250                            0.016
80.00                                      0.250                            0.016
74.93                                      0.250                            0.016
90.00                    06                0.250                            0.016
75.45                                      0.250                            0.016
78.87                                      0.250                            0.016
74.84                                      0.250                            0.016
80.00                                      0.250                            0.016
94.98                    11                0.250                            0.016
90.00                    01                0.250                            0.016
90.00                    06                0.250                            0.016
89.95                    12                0.250                            0.016
80.00                                      0.250                            0.016
79.98                                      0.250                            0.016
79.99                                      0.250                            0.016
80.00                                      0.250                            0.016
78.95                                      0.250                            0.016
89.67                    01                0.250                            0.016
80.00                                      0.250                            0.016
79.01                                      0.250                            0.016
90.00                    01                0.250                            0.016
73.56                                      0.250                            0.016
54.44                                      0.250                            0.016
90.00                    33                0.250                            0.016
85.19                    17                0.250                            0.016
80.00                                      0.250                            0.016
</TABLE>
                                                           
<PAGE>

                                   EXHIBIT F-3


            [Schedule of Mortgage Loans Serviced by Other Servicers]

NASCOR
NMI / 1997-4  Exhibit F-3 (Part A)
30 YEAR FIXED RATE NON-RELOCATION LOANS


<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     ------------------    -----   -----   --------  --------  --------  ----------   --------  ----------         ------------
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  ------------------    -----   -----   --------  --------  --------  ----------   --------  -----------        ------------
<S>       <C>                   <C>     <C>     <C>       <C>       <C>       <C>          <C>       <C>                <C>         
4546790   NORTH CALDWELL        NJ      07006   SFD       8.500     8.234     $2,032.24    360       1-Oct-26           $263,488.01 
4544389   UPLAND                CA      91784   SFD       9.000     8.734     $1,801.95    360       1-Aug-26           $223,074.22 
4554395   LEMONT                IL      60439   SFD       8.375     8.109     $1,618.95    360       1-Nov-26           $212,464.88 
4557233   VENTURA               CA      93001   SFD       8.250     7.984     $2,428.39    240       1-Nov-16           $283,104.50 
4557926   SANTA BARBARA         CA      93105   SFD       8.250     7.984     $2,247.79    360       1-Nov-26           $298,428.94 
4546307   CONIFER               CO      80433   SFD       7.875     7.609     $2,037.45    360       1-Jan-27           $280,611.95 
4553752   OMAHA                 NE      68130   SFD       7.750     7.484     $2,430.79    360       1-Dec-26           $338,576.92 
4546603   SAN JOSE              CA      95148   SFD       8.375     8.109     $1,672.16    360       1-Sep-26           $219,165.09 
4568648   VIRGINIA BEACH        VA      23455   SFD       7.750     7.484     $1,918.56    360       1-Jan-27           $267,420.74 
4568662   OWENSBORO             KY      42303   SFD       8.000     7.734     $2,004.28    360       1-Jan-27           $272,782.22 
4568689   AKRON                 OH      44333   SFD       8.000     7.734     $2,494.80    360       1-Jan-27           $339,542.22 
4568696   CINCINNATI            OH      45233   SFD       7.875     7.609     $1,595.16    360       1-Jan-27           $219,595.53 
4568703   GERMANTOWN            MD      20876   SFD       7.375     7.109     $1,519.49    360       1-Jan-27           $219,664.15 
4568714   OAKTON                VA      22124   SFD       8.250     7.984     $2,466.79    360       1-Jan-27           $327,929.80 
4568794   EVANSTON              IL      60201   SFD       7.875     7.609     $2,537.75    360       1-Jan-27           $349,516.67 
4569666   VALRICO               FL      33594   SFD       8.000     7.734     $1,937.14    360       1-Jan-27           $263,644.54 
4569674   TAMPA                 FL      33626   SFD       8.250     7.984     $2,270.76    240       1-Jan-17           $265,619.84 
4551784   RICHARDSON            TX      75081   SFD       8.750     8.484     $2,058.80    360       1-Nov-26           $261,091.10 
4569558   CINCINNATI            OH      45248   SFD       7.750     7.484     $1,576.11    360       1-Jan-27           $219,688.44 
4569569   CINCINNATI            OH      45241   SFD       7.750     7.484     $1,576.12    360       1-Jan-27           $219,688.43 
4569574   SPRINGBORO            OH      45066   SFD       8.125     7.859     $1,633.50    360       1-Jan-27           $219,711.19 
4569581   ALPHARETTA            GA      30202   SFD       7.625     7.359     $1,584.76    360       1-Jan-27           $223,574.85 
4569587   ROANOKE               VA      24014   SFD       7.875     7.609     $3,248.32    360       1-Feb-27           $447,691.68 
4569618   POTOMAC               MD      20854   SFD       7.750     7.484     $2,206.55    360       1-Jan-27           $307,343.63 
4569629   RICHMOND              VA      23221   SFD       7.625     7.359     $1,741.18    360       1-Jan-27           $245,642.76 
4569655   COLONIAL HEIGHTS      VA      23834   SFD       7.750     7.484     $1,558.20    360       1-Jan-27           $217,191.99 
4569677   INDIANAPOLIS          IN      46236   SFD       7.750     7.484     $2,686.55    360       1-Jan-27           $374,468.94 
4569696   WORTHINGTON           OH      43085   SFD       7.625     7.359     $1,557.15    360       1-Jan-27           $219,680.52 
4569702   INVERNESS             IL      60010   SFD       8.000     7.734     $1,937.14    360       1-Jan-27           $263,644.54 
4569713   CINCINNATI            OH      45242   SFD       7.875     7.609     $2,562.40    360       1-Feb-27           $353,156.79 
4567466   CHARLOTTE             NC      28226   SFD       7.875     7.609     $2,201.68    360       1-Jan-27           $303,230.67 
4567605   FRANKLIN              TN      37067   SFD       7.625     7.359     $1,731.27    360       1-Dec-26           $244,065.49 
4567623   LEXINGTON             SC      29072   SFD       8.500     8.234     $2,652.76    360       1-Dec-26           $344,368.52 
4567836   ST GEORGE ISLAND      FL      32328   SFD       8.000     7.734     $1,971.63    360       1-Jan-27           $268,338.20 
4568115   LEESBURG              VA      22075   SFD       8.375     8.109     $2,280.22    360       1-Dec-26           $299,436.68 
4568789   MARIETTA              GA      30067   SFD       7.750     7.484     $1,898.49    360       1-Dec-26           $264,435.27 
4568796   CINCINNATI            OH      45246   SFD       8.250     7.984     $1,749.70    360       1-Jan-27           $232,601.96 
4568961   ATLANTA               GA      30327   SFD       7.750     7.484     $2,057.54    360       1-Jan-27           $286,793.27 
4569235   TAMPA                 FL      33626   SFD       8.250     7.984     $2,052.04    353       1-Jun-26           $271,533.29 
4569321   BETHANY BEACH         DE      19930   SFD       7.750     7.484     $3,582.07    360       1-Jan-27           $499,291.92 
4569720   CHAPEL HILL           NC      27514   SFD       8.000     7.734     $2,898.37    360       1-Jan-27           $394,468.16 
4570065   ATLANTA               GA      30328   SFD       8.375     8.109     $1,824.17    360       1-Jan-27           $239,398.53 


<CAPTION>
(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)       
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE        
LTV       SUBSIDY        CODE              FEE            LOAN              FEE               
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C>              
79.99                                      0.250                            0.0160    
79.98                                      0.250                            0.0160    
89.87                    12                0.250                            0.0160    
65.52                                      0.250                            0.0160    
74.99                                      0.250                            0.0160    
72.05                                      0.250                            0.0160    
89.31                    06                0.250                            0.0160    
79.14                                      0.250                            0.0160    
79.94                                      0.250                            0.0160    
90.00                    06                0.250                            0.0160    
80.00                                      0.250                            0.0160    
67.69                                      0.250                            0.0160    
88.00                    06                0.250                            0.0160    
78.18                                      0.250                            0.0160    
50.00                                      0.250                            0.0160    
94.98                    06                0.250                            0.0160    
71.83                                      0.250                            0.0160    
94.99                    33                0.250                            0.0160    
74.58                                      0.250                            0.0160    
80.00                                      0.250                            0.0160    
88.00                    33                0.250                            0.0160    
79.99                                      0.250                            0.0160    
80.00                                      0.250                            0.0160    
68.44                                      0.250                            0.0160    
80.00                                      0.250                            0.0160    
75.00                                      0.250                            0.0160    
73.89                                      0.250                            0.0160    
59.46                                      0.250                            0.0160    
58.02                                      0.250                            0.0160    
66.68                                      0.250                            0.0160    
80.00                                      0.250                            0.0160    
94.99                    13                0.250                            0.0160    
75.00                                      0.250                            0.0160    
79.99                                      0.250                            0.0160    
94.30                    12                0.250                            0.0160    
72.21                                      0.250                            0.0160    
76.13                                      0.250                            0.0160    
80.00                                      0.250                            0.0160    
87.71                    11                0.250                            0.0160    
79.37                                      0.250                            0.0160    
68.10                                      0.250                            0.0160    
80.00                                      0.250                            0.0160    
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
(i)       (ii)                                  (iii)     (iv)      (v)       (vi)         (vii)     (viii)             (ix)        
- -----     ------------------    -----   -----   --------  --------  --------  ----------   --------  ----------         ------------
                                                                    NET                                                 CUT-OFF
MORTGAGE                                                  MORTGAGE  MORTGAGE  CURRENT      ORIGINAL  SCHEDULED          DATE        
LOAN                                    ZIP     PROPERTY  INTEREST  INTEREST  MONTHLY      TERM TO   MATURITY           PRINCIPAL   
NUMBER    CITY                  STATE   CODE    TYPE      RATE      RATE      PAYMENT      MATURITY  DATE               BALANCE     
- --------  ------------------    -----   -----   --------  --------  --------  ----------   --------  -----------        ------------
<S>       <C>                   <C>     <C>     <C>       <C>       <C>       <C>          <C>       <C>                <C>         
4570073   TALLAHASSEE           FL      32303   PUD       8.625     8.359     $1,764.80    360       1-Dec-26           $226,495.23 
                                                                                                                             
                                                                                                                     $12,091,662.27


<CAPTION>
(x)       (xi)           (xii)             (xiii)         (xiv)             (xv)       
- ------    ---------      ----------        --------       -----------       -----------  
                                                                                                         
                         MORTGAGE                         T.O.P.            MASTER       
                         INSURANCE         SERVICE        MORTGAGE          SERVICE        
LTV       SUBSIDY        CODE              FEE            LOAN              FEE               
- ------    ---------      ----------        --------       -----------       -----------  
<S>       <C>            <C>               <C>                              <C>              
84.98                    06                0.250                            0.0160    
</TABLE>


COUNT:                    43
WAC:             8.016165809
WAM:             351.9167291
WALTV:           77.82495595


<PAGE>

                                    EXHIBIT G


                               REQUEST FOR RELEASE
                             (for Trustee/Custodian)


Loan Information
- ----------------

         Name of Mortgagor:               -----------------------------

         Servicer
         Loan No.:                        -----------------------------

Custodian/Trustee
- -----------------

         Name:                             -----------------------------

         Address:                          -----------------------------

                                           -----------------------------
         Custodian/Trustee
         Mortgage File No.:                -----------------------------

Seller
- ------

         Name:                             -----------------------------

         Address:                          -----------------------------

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

         Certificates:                     Mortgage Pass-Through Certificates,
                                           Series 1997-4


          The  undersigned  Master  Servicer  hereby  acknowledges  that  it has
received from First Union  National Bank of North  Carolina,  as Trustee for the
Holders of Mortgage  Pass-Through  Certificates,  Series  1997-4,  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 March 27, 1997 (the "Pooling and Servicing
Agreement") among the Trustee, the Seller and the Master Servicer.

(    ) 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 Trustee 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  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.

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 1997-4,  Class [A-R] [A-LR] Certificate (the
"Class [A-R] [A-LR]  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 the fiduciary provisions 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] [A-LR]
Certificate as they become due.

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

          6.  That the  Purchaser  will not  transfer  the  Class  [A-R]  [A-LR]
Certificate to any person or entity from which the Purchaser has not received an
affidavit  substantially  in the  form of this  affidavit  and as to  which  the
Purchaser has actual knowledge that the requirements set forth in paragraph 3, 4
or 7 hereof are not  satisfied or that the Purchaser has reason to know does not
satisfy the requirements set forth in paragraph 4 hereof.

          7.  That  the  Purchaser  (i) is not a  Non-U.S.  Person  or (ii) is a
Non-U.S. Person that holds the Class [A-R] [A-LR] Certificate in connection with
the conduct of a trade or business  within the United  States and has  furnished
the transferor and the Trustee with an effective  Internal  Revenue Service Form
4224 or  successor  form at the time and in the manner  required  by the Code or
(iii) is a Non-U.S.  Person that has  delivered to both the  transferor  and the
Trustee an opinion of a nationally recognized tax counsel to the effect that the
transfer of the Class [A-R] [A-LR]  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] [A-LR]  Certificate will not be disregarded for
federal income tax purposes. "Non-U.S. Person" means an individual, corporation,
partnership  or other  person  other  than a citizen or  resident  of the United
States,  a  corporation,  partnership or other entity created or organized in or
under the laws of the United States or any  political  subdivision  thereof,  an
estate that is subject to U.S.  federal  income tax  regardless of the source of
its income or a trust if (i) for taxable years beginning after December 31, 1996
(or for taxable  years ending after August 20, 1996,  if the trustee has made an
applicable  election),  a court  within  the United  States is able to  exercise
primary  supervision  over the  administration  of such  trust,  and one or more
United  States  fiduciaries  have  the  authority  to  control  all  substantial
decisions  of such  trust or (ii) for all other  taxable  years,  such  trust is
subject to U.S. federal income tax regardless of the source of its income.

          8. That the  Purchaser  agrees to such  amendments  of the Pooling and
Servicing Agreement as may be required to further effectuate the restrictions on
transfer  of  the  Class  [A-R]  [A-LR]  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
[Upper-Tier][Lower-Tier]  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] [A-LR] Certificate]





                                     [Date]




First Union National Bank of North Carolina
230 South Tryon Street
Charlotte, North Carolina 28288

          Re:  Norwest Asset Securities Corporation,
               Series 1997-4, Class [A-R][A-LR]
               -------------------------------------

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 1997-4
          CLASS [A-WIO] [M] [B-1] [B-2] [B-3] [B-4] [B-5] CERTIFICATES


                               TRANSFEREE'S LETTER
                               -------------------



                                                     ----------------- --, ----

First Union National Bank of North Carolina
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 1997-4, Class
[A-WIO] [M] [B-1]  [B-2]  [B-3] [B-4] [B-5] (the "Class  [A-WIO] [M] [B-1] [B-2]
[B-3] [B-4] [B-5]  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 March 27, 1997 (the "Pooling and Servicing
Agreement") among Norwest Asset Securities  Corporation,  as seller  ("NASCOR"),
Norwest Bank Minnesota,  National  Association,  as master servicer (the "Master
Servicer"),  and First Union  National Bank of North  Carolina,  as trustee (the
"Trustee"),  of  Norwest  Asset  Securities  Corporation  Mortgage  Pass-Through
Certificates, Series 1997-4.

          Section  2.  Representations  and  Warranties  of  the  Purchaser.  In
connection with the proposed transfer,  the Purchaser represents and warrants to
NASCOR, the Master Servicer and the Trustee 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-WIO] [M] [B-1] [B-2]
     [B-3] [B-4] [B-5] Certificates,  and to enter into this Agreement, and duly
     executed and delivered this Agreement.

          (b) The Purchaser is acquiring the Class [A-WIO] [M] [B-1] [B-2] [B-3]
     [B-4] [B-5]  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-WIO] [M] [B-1] [B-2] [B-3] [B-4] [B-5]  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-WIO] [M] [B-1] [B-2]
     [B-3]  [B-4]  [B-5]  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 relating to the Class [A-WIO] [M]
     [B-1] [B-2] [B-3] [B-4] [B-5]  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 NASCOR  concerning  the Class [A-WIO] [M] [B-1] [B-2]
     [B-3] [B-4] [B-5] Certificates and all matters relating thereto, and obtain
     any additional  information  (including documents) relevant to its decision
     to  purchase   the  Class   [A-WIO]  [M]  [B-1]  [B-2]  [B-3]  [B-4]  [B-5]
     Certificates  that NASCOR  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-WIO]  [M] [B-1]  [B-2]  [B-3] [B-4] [B-5]
     Certificates.  The Purchaser  will not use or disclose any  information  it
     receives in  connection  with its  purchase of the Class  [A-WIO] [M] [B-1]
     [B-2]  [B-3]  [B-4]  [B-5]  Certificates  other than in  connection  with a
     subsequent  sale of  Class  [A-WIO]  [M]  [B-1]  [B-2]  [B-3]  [B-4]  [B-5]
     Certificates.

          (e) Either (i) the Purchaser is not an employee  benefit plan or other
     retirement arrangement subject to the fiduciary  responsibility  provisions
     of the  Employee  Retirement  Income  Security  Act  of  1974,  as  amended
     ("ERISA"), or Section 4975 of the Internal Revenue Code of 1986, as amended
     (the "Code"),  or 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-3]  [B-4]  [B-5]
     Certificates only] if the Purchaser is an insurance company,  the source of
     funds used to  purchase  the Class [B-3]  [B-4]  [B-5]  Certificates  is an
     "insurance  company  general  account"  (as such term is defined in Section
     V(e) of Prohibited Transaction Class Exemption 95-60 ("PTE 95-60"), 60 Fed.
     Reg.  35925 (July 12, 1995)) and there is no Plan with respect to which the
     amount  of  such  general  account's   reserves  and  liabilities  for  the
     contract(s)  held  by or on  behalf  of  such  Plan  and  all  other  Plans
     maintained by the same employer (or affiliate thereof as defined in Section
     V(a)(1) of PTE 95-60) or by the same employee  organization  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 or iii) the Purchaser has provided (a) a "Benefit Plan Opinion"
     satisfactory  to NASCOR and the  Trustee  of the Trust  Estate and (b) such
     other opinions of counsel,  officers' certificates and agreements as NASCOR
     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 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-WIO] [M] [B-1] [B-2] [B-3]  [B-4] [B-5]  Certificates  is in  compliance
     therewith.

          Section 3. Transfer of Class [A-WIO] [M] [B-1] [B-2] [B-3] [B-4] [B-5]
                     -----------------------------------------------------------
Certificates.
- -------------

          (a) The Purchaser  understands  that the Class [A-WIO] [M] [B-1] [B-2]
     [B-3]  [B-4]  [B-5]   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-WIO] [M] [B-1] [B-2] [B-3] [B-4]
     [B-5] Certificates are registered under the Act and applicable state law or
     unless an exemption from  registration is available.  The Purchaser further
     understands  that neither  NASCOR,  the Master  Servicer nor the Trustee is
     under any  obligation  to register the Class  [A-WIO] [M] [B-1] [B-2] [B-3]
     [B-4] [B-5] 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 Trustee shall require,  in order
     to  assure   compliance  with  such  laws,  that  the   Certificateholder's
     prospective  transferee certify to NASCOR and the Trustee 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  Trustee  or  NASCOR  may,  if such
     transfer is made within  three years from the later of (a) the Closing Date
     or (b) the last date on which NASCOR 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  Trustee,   the  Master  Servicer  or  NASCOR.   Any  such
     Certificateholder  desiring to effect such transfer shall,  and does hereby
     agree to,  indemnify  the Trustee,  the Master  Servicer,  any Paying Agent
     acting on behalf of the Trustee and NASCOR  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-WIO] [M] [B-1] [B-2] [B-3] [B-4] [B-5]
     Certificate  shall be made unless the  transferee  provides  NASCOR and the
     Trustee  with a  Transferee's  Letter,  substantially  in the  form of this
     Agreement.

          (c) The Purchaser  acknowledges that its Class [A-WIO] [M] [B-1] [B-2]
     [B-3] [B-4] [B-5]  Certificates  bear a legend setting forth the applicable
     restrictions on transfer.

<PAGE>

          IN WITNESS  WHEREOF,  the undersigned has caused this Agreement to the
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 1997-4
                            CLASS [A-12] CERTIFICATES


                               TRANSFEREE'S LETTER
                               -------------------



                                                    ----------------- --, ----


First Union National Bank of North Carolina
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 1997-4, Class
[A-12]  (the  "Class  [A-12]   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 March 27, 1997 (the "Pooling and Servicing
Agreement") among Norwest Asset Securities  Corporation,  as seller  ("NASCOR"),
Norwest Bank Minnesota,  National  Association,  as master servicer (the "Master
Servicer"),  and First Union  National Bank of North  Carolina,  as trustee (the
"Trustee"),  of  Norwest  Asset  Securities  Corporation  Mortgage  Pass-Through
Certificates, Series 1997-4.

          Section  2.  Representations  and  Warranties  of  the  Purchaser.  In
connection with the proposed transfer,  the Purchaser represents and warrants to
NASCOR, the Master Servicer and the Trustee that:

          Either (i) the  Purchaser  is not an  employee  benefit  plan or other
retirement arrangement subject to the fiduciary responsibility provisions of the
Employee  Retirement  Income  Security  Act of 1974,  as amended  ("ERISA"),  or
Section 4975 of the Internal Revenue Code of 1986, as amended (the "Code"), or 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,  the source of funds used to purchase
the Class [A-12]  Certificate is an "insurance company general account" (as such
term is defined in Section V(e) of Prohibited  Transaction Class Exemption 95-60
("PTE  95-60"),  60 Fed.  Reg.  35925 (July 12, 1995)) and there is no Plan with
respect to which the amount of such general  account's  reserves and liabilities
for the  contract(s)  held by or on  behalf  of such  Plan and all  other  Plans
maintained  by the same  employer  (or  affiliate  thereof as defined in Section
V(a)(1) of PTE 95-60) or by the same  employee  organization  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 or
(iii) the Purchaser has provided (a) a "Benefit  Plan Opinion"  satisfactory  to
NASCOR and the  Trustee  of the Trust  Estate  and (b) such  other  opinions  of
counsel,  officers' certificates and agreements as NASCOR 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 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).

          IN WITNESS  WHEREOF,  the undersigned has caused this Agreement to the
validly  executed by its duly  authorized  representative  as of the day and the
year first above written.

                                   [PURCHASER]


By:  -------------------------------
Its:  ------------------------------


<PAGE>


                                    EXHIBIT L

                   Norwest Mortgage, Inc. Servicing Agreement

                Countrywide Home Loans, Inc. Servicing Agreement

               First Bank National Association Servicing Agreement

                      HomeSide Lending Servicing Agreement

               National City Mortgage Company Servicing Agreement

                   Suntrust Mortgage Inc. 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 1997-4, Class
- ---- (the "Class B Certificates"). The Class B Certificates were issued pursuant
to a Pooling and  Servicing  Agreement  dated as of March 27, 1997 among Norwest
Asset  Securities  Corporation,  as Seller  ("NASCOR"),  Norwest Bank Minnesota,
National Association, as Master Servicer, and First Union National Bank of North
Carolina, 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
P-1 by Moody's  Investors  Service,  Inc.  ("Moody's")  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 Aa2 by Moody's
or AA by 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 P-1 by Moody's or A-1 by S&P or (z) the  depository  institution  or trust
company is one that is acceptable to either  Moody's 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  2.02(e)) 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 related  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,  to the
extent that the  Company as Master  Servicer is granted  such  authority  in the
related  Servicing  Agreement,  the  related  Servicer  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,  to the
extent that the  Company as Master  Servicer is granted  such  authority  in the
related  Servicing  Agreement,  the related Servicer 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 cause,  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 such 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 (i) be provided
only to the extent it is not  confidential  in nature and (ii) is  obtainable by
the related  Servicer  from  existing  reports,  certificates  or  statements or
otherwise be 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  therein 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 as of the date hereof,  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 if immediately
available  funds from the  Purchaser  to the  Company for deposit in the related
Certificate Account or Lower-Tier Certificate Account as applicable; or (ii) the
related Servicer may 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 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  as of the  date  hereof,  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) 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 1997-4. 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  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 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,
NASCOR, and each Servicer and each person who controls the Company, NASCOR, or a
Servicer and each of their respective officers, directors, affiliates and agents
acting at the Company's,  NASCOR'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, NASCOR, or a Servicer, or on their behalf,
in  accordance  with the  provisions  of this  Agreement  and (i) which  actions
conflict with the Company's,  NASCOR'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

                           [FORM OF CLASS A-8 POLICY]


We consent to the incorporation by reference in the Prospectus  Supplement dated
March 19, 1997 (to Prospectus  dated March 19, 1997) of Norwest Asset Securities
Corporation relating to Mortgage Pass-Through Certificates,  Series 19974 of our
report  dated  January 17,  1996,  on our audits of the  consolidated  financial
statements of Financial  Security Assurance Inc. and Subsidiaries as of December
31, 1995 and 1994,  and for each of the three years in the period ended December
31,  1995.  We also  consent  to the  reference  to our Firm  under the  caption
"Experts".

                          /s/ Coopers & Lybrand L.L.P.
                          ----------------------------
                          Coopers & Lybrand L.L.P.


New York, New York
March 19, 1997
 



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