NORWEST ASSET SECURITIES CORP
424B5, 1996-08-23
ASSET-BACKED SECURITIES
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<PAGE>
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED AUGUST 19, 1996)
                                                                          [LOGO]
                           $344,016,157 (APPROXIMATE)
                      NORWEST ASSET SECURITIES CORPORATION
                                   ("NASCOR")
 
                                     SELLER
 
               MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 1996-4
      PRINCIPAL AND INTEREST PAYABLE MONTHLY, COMMENCING IN SEPTEMBER 1996
 
    The  Series 1996-4  Mortgage Pass-Through  Certificates (the  "Series 1996-4
Certificates") will consist of  one class of senior  certificates (the "Class  A
Certificates")  and  two  classes  of subordinated  certificates  (the  "Class M
Certificates" and the  "Class B Certificates,"  respectively, and together,  the
"Subordinated Certificates"). The Class A Certificates are entitled to a certain
priority,  relative  to  the Class  M  and  Class B  Certificates,  in  right of
distributions on the Mortgage Loans. As between the Class M Certificates and the
Class B  Certificates,  the Class  M  Certificates  are entitled  to  a  certain
priority  in  right  of  distributions  on  the  Mortgage  Loans.  The  Class  A
Certificates will consist of eighteen  subclasses of Certificates designated  as
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-13, Class
A-14, Class A-15, Class A-16, Class A-R and Class A-LR Certificates. The Class M
Certificates will not be divided into subclasses. The Class B Certificates  will
consist  of five subclasses  of Certificates designated as  the Class B-1, Class
B-2, Class B-3, Class B-4 and Class  B-5 Certificates. Each subclass of Class  A
and  Class B  Certificates is referred  to herein  as a "Subclass."  The Class A
Certificates, other than the Class  A-12 Certificates, the Class M  Certificates
and  the  Class  B-1 and  Class  B-2  Certificates are  the  only  Series 1996-4
Certificates being offered hereby and are referred to herein collectively as the
"Offered Certificates." The Class B-1 and Class B-2 Certificates are referred to
herein collectively as the "Offered Class B Certificates."
                                                        (CONTINUED ON NEXT PAGE)
                          ---------------------------
THESE SECURITIES DO NOT REPRESENT INTERESTS IN OR OBLIGATIONS OF NORWEST  ASSET
 SECURITIES  CORPORATION OR ANY AFFILIATE THEREOF. NEITHER THESE SECURITIES NOR
 THE UNDERLYING  MORTGAGE  LOANS  WILL  BE INSURED  OR  GUARANTEED  BY  ANY
                              GOVERNMENTAL AGENCY OR INSTRUMENTALITY.
                            ------------------------
 
THESE  SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE  SECURITIES COMMISSION NOR HAS THE  SECURITIES
 AND  EXCHANGE COMMISSION OR  ANY STATE SECURITIES  COMMISSION PASSED UPON THE
  ACCURACY OR ADEQUACY OF THIS PROSPECTUS SUPPLEMENT OR THE PROSPECTUS.  ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
<TABLE>
<CAPTION>
              SUBCLASS OR                 INITIAL SUBCLASS OR CLASS   PASS-THROUGH
           CLASS DESIGNATION                PRINCIPAL BALANCE (1)         RATE
<S>                                       <C>                         <C>
Class A-1...............................         $ 5,072,504              7.75%
Class A-2...............................         $ 4,165,803              7.00%
Class A-3...............................         $ 6,985,000              7.75%
Class A-4...............................         $ 2,600,000              7.75%
Class A-5...............................         $35,530,400              7.75%
Class A-6...............................         $30,424,084              7.75%
Class A-7...............................         $20,082,904              7.75%
Class A-8...............................         $98,382,494              7.40%
Class A-9...............................         $ 7,064,000              7.15%
Class A-10..............................         $13,902,764              7.00%
</TABLE>
 
<TABLE>
<CAPTION>
              SUBCLASS OR                 INITIAL SUBCLASS OR CLASS   PASS-THROUGH
           CLASS DESIGNATION                PRINCIPAL BALANCE(1)          RATE
<S>                                       <C>                         <C>
Class A-11..............................         $ 2,872,631              7.75%
Class A-13..............................         $ 8,300,986              7.75%
Class A-14..............................         $46,901,000              7.20%
Class A-15..............................         $36,730,387              7.50%
Class A-16..............................         $ 6,800,000              7.00%
Class A-R...............................         $       100              7.75%
Class A-LR..............................         $       100              7.75%
Class M.................................         $ 9,580,000              7.75%
Class B-1...............................         $ 4,790,000              7.75%
Class B-2...............................         $ 3,831,000              7.75%
</TABLE>
 
(1) APPROXIMATE. THE INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCES ARE SUBJECT TO
    ADJUSTMENT AS DESCRIBED HEREIN.
 
    PROSPECTIVE  INVESTORS  IN  THE  OFFERED  CERTIFICATES  SHOULD  CONSIDER THE
FACTORS DISCUSSED UNDER  "RISK FACTORS"  IN THIS PROSPECTUS  SUPPLEMENT ON  PAGE
S-33 AND IN THE PROSPECTUS ON PAGE 13.
                              -------------------
 
    The  Offered Certificates will be purchased  by Donaldson, Lufkin & Jenrette
Securities Corporation (the "Underwriter") from  the Seller and will be  offered
by  the Underwriter from time to time in negotiated transactions or otherwise at
varying prices to be determined at the time of sale. Proceeds to the Seller from
the sale  of  the Offered  Certificates  will  be approximately  98.75%  of  the
aggregate  initial principal balance of the Class A Certificates (other than the
Class  A-12  Certificates),  approximately  97.56%  of  the  aggregate   initial
principal  balance  of the  Class M  Certificates,  approximately 96.21%  of the
aggregate  initial  principal  balance  of   the  Class  B-1  Certificates   and
approximately 92.34% of the aggregate initial principal balance of the Class B-2
Certificates,  plus, in each case, accrued interest thereon at the rate of 7.75%
per annum from August  1, 1996 to  (but not including)  August 27, 1996,  before
deducting  expenses payable by the Seller estimated to be $415,000. The price to
be paid to the Seller for the  Class A Certificates offered hereby has not  been
allocated  among  such Subclasses  of Class  A Certificates.  See "Underwriting"
herein.
 
    The Offered Certificates  are offered  by the Underwriter  subject to  prior
sale,  when, as and  if accepted by  the Underwriter and  subject to approval of
certain legal matters by Brown  & Wood LLP, counsel  for the Underwriter. It  is
expected  that delivery  of the  Offered Certificates will  be made  on or about
August 27, 1996 through  the facilities of The  Depository Trust Company, or  in
the case of the Class A-R, Class A-LR, Class M and Offered Class B Certificates,
at  the office of Donaldson, Lufkin & Jenrette Securities Corporation, New York,
N.Y. against payment therefor in immediately available funds.
 
                          DONALDSON, LUFKIN & JENRETTE
                             SECURITIES CORPORATION
 
           THE DATE OF THIS PROSPECTUS SUPPLEMENT IS AUGUST 22, 1996.
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
    The Class A-7, Class A-8, Class A-9, Class A-14 and Class A-15  Certificates
are  targeted  amortization  class  certificates  and  are  referred  to  herein
collectively  as  the  "TAC  Certificates."  The  Class  A-11  and  Class   A-13
Certificates  are companion certificates and are referred to herein collectively
as the "Companion Certificates." The  Class A-11 Certificates are also  referred
to  herein as the "Accrual Certificates." The  Class A-2, Class A-10, Class A-13
and the  Class A-16  Certificates are  referred to  herein collectively  as  the
"Accretion  Directed Certificates." The  Class A-12 Certificates,  which are not
offered  hereby,  will  be  deemed  to  consist  of  five  components  (each,  a
"Component"  or  a "Class  A-12  Component") consisting  of  three interest-only
Components (the "Class A-12 IO A Component," the "Class A-12 IO B Component" and
the "Class A-12 IO C Component"), a targeted amortization class Component  which
is  also an  accrual Component  (the "Class A-12  TAC Accrual  Component") and a
principal-only Component (the "Class A-12  PO Component"). The beneficial  owner
of a Class A-12 Certificate will not have a severable interest in any Component,
but will have an undivided interest in the entire Subclass.
 
    The  credit  enhancement  for  the Series  1996-4  Certificates  is provided
through the  use of  a "shifting  interest" type  subordination, which  has  the
effect  of allocating all or a  disproportionate amount of principal prepayments
and other unscheduled receipts of principal  to the Class A Certificates  (other
than the Class A-12 Certificates with respect to the Class A-12 PO Component) in
the  aggregate for at least nine years beginning on the first Distribution Date.
See "Summary Information -- Credit Enhancement " and "-- Effects of  Prepayments
on  Investment Expectations," "Description of  the Certificates" and "Prepayment
and Yield Considerations" herein.
 
    The Series 1996-4  Certificates will  evidence in the  aggregate the  entire
beneficial  ownership interest in a trust  fund (the "Trust Estate") established
by  Norwest  Asset  Securities  Corporation  (the  "Seller"  or  "NASCOR")   and
consisting  of a pool  of fixed interest rate,  conventional, monthly pay, fully
amortizing,  one-  to  four-family,  residential  first  mortgage  loans  having
original terms to stated maturity ranging from approximately 20 to approximately
30  years (the "Mortgage Loans"), other  than the Fixed Retained Yield described
herein, together with certain  related property. Certain  of the Mortgage  Loans
may  be secured primarily by shares  issued by cooperative housing corporations.
The servicing  of the  Mortgage Loans  will be  performed by  various  servicers
identified  herein  (each,  a  "Servicer"),  including  Norwest  Mortgage,  Inc.
("Norwest  Mortgage"),  an  affiliate  of  both  the  Seller  and  Norwest  Bank
Minnesota,  National  Association ("Norwest  Bank"), and  will be  supervised by
Norwest Bank (in such capacity, the "Master Servicer"). The Mortgage Loans  will
be  acquired  by  the  Seller on  the  date  of issuance  of  the  Series 1996-4
Certificates from Norwest  Mortgage, and  will have been  originated by  Norwest
Mortgage  or  acquired by  Norwest Mortgage  from  The Prudential  Home Mortgage
Company, Inc. ("PHMC") or  various other entities (each  such other entity, a  "
Norwest  Mortgage Correspondent"). The Mortgage  Loans not originated by Norwest
Mortgage  or  acquired  from  PHMC  were  originated  by  the  Norwest  Mortgage
Correspondents  or acquired by  the Norwest Mortgage  Correspondents pursuant to
mortgage  loan   purchase   programs   operated   by   such   Norwest   Mortgage
Correspondents.  See "Description  of the  Mortgage Loans"  herein. The  Class A
Certificates will  initially evidence  in the  aggregate an  approximate  94.00%
undivided  interest in the principal balance of  the Mortgage Loans. The Class M
Certificates will  initially  evidence in  the  aggregate an  approximate  2.50%
undivided interest in the principal balance of the Mortgage Loans. The Class B-1
Certificates  will  initially evidence  in  the aggregate  an  approximate 1.25%
undivided interest in the principal balance of the Mortgage Loans. The Class B-2
Certificates will  initially  evidence in  the  aggregate an  approximate  1.00%
undivided interest in the principal balance of the Mortgage Loans. The remaining
approximate  1.25% undivided interest  in the principal  balance of the Mortgage
Loans will be evidenced by the Class B-3, Class B-4 and Class B-5 Certificates.
 
    Distributions in respect of interest and principal will be made on the  25th
day  of each  month or, if  such day  is not a  business day,  on the succeeding
business day (each a "Distribution Date"), commencing in September 1996, to  the
holders   of  Offered  Certificates,   as  described  herein.   The  Class  A-11
Certificates and the Class A-12 TAC  Accrual Component will accrete interest  as
described  herein. Holders of the Class A-11  Certificates and of the Class A-12
Certificates with respect to  the Class A-12 TAC  Accrual Component will not  be
entitled  to current distributions of  interest until their respective Accretion
Termination Dates. Prior to such time, an amount equal to the accrued and unpaid
interest on  the Class  A-11 Certificates  and  on the  Class A-12  TAC  Accrual
Component will be added to the principal balance and Component Principal Balance
thereof,  respectively, and  will be distributed  in reduction  of the principal
balances of the Accretion Directed Certificates and the Class A-11  Certificates
and  the Component Principal Balance of the  Class A-12 TAC Accrual Component to
the extent described herein under
 
                                      S-2
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
"Description  of  the  Certificates  --  Principal  (Including  Prepayments)  --
Allocation  of Amount to be Distributed." The  amount of interest accrued on any
Subclass or Class  of Offered  Certificates will  be reduced  by any  prepayment
interest  shortfalls and certain other shortfalls  in the collection of interest
from  mortgagors,  as  well  as  certain  losses,  as  described  herein   under
"Description  of the  Certificates -- Interest."  On any  Distribution Date, the
holders of the Class M Certificates will receive distributions of interest  only
if  the holders of the  Class A Certificates have  received all amounts due them
(other than  the  Class  A-12  PO  Component  Deferred  Amount)  on  such  date.
Distributions  of principal to holders of the  Class M Certificates will be made
only after holders of the Class  A Certificates have received all  distributions
to  which  they  are  entitled  (including,  in  the  case  of  the  Class  A-12
Certificates, the Class A-12  PO Component Deferred Amount)  and the holders  of
the  Class M  Certificates have  received the amount  of interest  due them with
respect to such Distribution  Date. On any Distribution  Date, the holders of  a
Subclass  of Class B Certificates will receive distributions of interest only if
the holders  of the  Class A  Certificates  and Class  M Certificates  and  each
Subclass  of  Class  B  Certificates with  a  lower  numerical  designation have
received all amounts of interest and of principal (other than the Class A-12  PO
Component   Deferred  Amount)  to   which  they  are   entitled  on  such  date.
Distributions of principal to holders of a Subclass of Class B Certificates will
be made only after the Class A  Certificates, the Class M Certificates and  each
Subclass  of  Class  B  Certificates with  a  lower  numerical  designation have
received all distributions to which they are entitled (including, in the case of
the Class A-12 Certificates,  the Class A-12 PO  Component Deferred Amount)  and
such  Subclass has  received the  amount of  interest due  with respect  to such
Distribution Date. Distributions in  reduction of the  principal balance of  the
Class  A  Certificates on  any  Distribution Date  will  be allocated  among the
Subclasses of the  Class A  Certificates in  the manner  described herein  under
"Description   of  the  Certificates   --  Principal  (Including  Prepayments)."
Distributions to each Subclass or  undivided Class of Offered Certificates  will
be made pro rata among Certificateholders of such Subclass or Class.
 
    The Offered Certificates may not be an appropriate investment for individual
investors  who do  not have  sufficient resources  or expertise  to evaluate the
particular characteristics  of  the  applicable Subclass  or  Class  of  Offered
Certificates. This may be the case because:
 
    - The  yield to maturity of Offered  Certificates purchased at a price other
      than par will be sensitive to  the uncertain rate and timing of  principal
      prepayments on the Mortgage Loans;
 
    - The  rate of principal distributions on, and the weighted average life of,
      the Offered  Certificates will  be  sensitive to  the uncertain  rate  and
      timing  of principal  prepayments on  the Mortgage  Loans and  as such the
      Offered Certificates  may be  inappropriate  investments for  an  investor
      requiring a distribution of a particular amount of principal on a specific
      date or an otherwise predictable stream of distributions;
 
    - There  can  be no  assurance that  an  investor will  be able  to reinvest
      amounts distributed  in respect  of principal  on an  Offered  Certificate
      (which,  in  general,  are  expected  to  be  greater  during  periods  of
      relatively low  interest  rates)  at  a  rate at  least  as  high  as  the
      Pass-Through Rate applicable thereto;
 
    - As  discussed below, there can be no assurance that a secondary market for
      the Offered Certificates will  develop or provide Certificateholders  with
      liquidity of investment; and
 
    - The  Offered  Certificates  are subject  to  the further  risks  and other
      special considerations discussed  herein and in  the Prospectus under  the
      heading "Risk Factors."
 
    THE  YIELD  TO MATURITY  OF THE  OFFERED CERTIFICATES  WILL BE  SENSITIVE IN
VARYING DEGREES  TO  THE  RATE  AND  TIMING  OF  PRINCIPAL  PAYMENTS  (INCLUDING
PREPAYMENTS,  WHICH MAY  BE MADE  AT ANY TIME  WITHOUT PENALTY)  ON THE MORTGAGE
LOANS. INVESTORS  IN THE  OFFERED CERTIFICATES  SHOULD CONSIDER  THE  ASSOCIATED
RISKS,  INCLUDING, IN THE CASE OF  OFFERED CERTIFICATES PURCHASED AT A DISCOUNT,
THE RISK THAT A SLOWER THAN ANTICIPATED RATE OF PAYMENTS IN RESPECT OF PRINCIPAL
(INCLUDING PREPAYMENTS) ON THE  MORTGAGE LOANS COULD RESULT  IN AN ACTUAL  YIELD
THAT  IS LOWER THAN ANTICIPATED.  A FASTER THAN ANTICIPATED  RATE OF PAYMENTS IN
RESPECT OF PRINCIPAL (INCLUDING PREPAYMENTS) ON THE MORTGAGE LOANS COULD  RESULT
IN  AN  ACTUAL YIELD  THAT IS  LOWER THAN  ANTICIPATED FOR  INVESTORS PURCHASING
OFFERED CERTIFICATES AT A PREMIUM. INVESTORS PURCHASING OFFERED CERTIFICATES  AT
A PREMIUM SHOULD ALSO CONSIDER THE RISK THAT A RAPID RATE OF PAYMENTS IN RESPECT
OF  PRINCIPAL (INCLUDING PREPAYMENTS) ON THE  MORTGAGE LOANS COULD RESULT IN THE
FAILURE OF SUCH INVESTORS TO FULLY RECOVER THEIR INITIAL INVESTMENTS. THE  YIELD
TO  MATURITY OF THE CLASS M CERTIFICATES WILL BE MORE SENSITIVE THAN THAT OF THE
CLASS A CERTIFICATES TO THE AMOUNT AND  TIMING OF LOSSES DUE TO LIQUIDATIONS  OF
THE  MORTGAGE  LOANS,  IN THE  EVENT  THAT  THE CLASS  B  PRINCIPAL  BALANCE HAS
 
                                      S-3
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
BEEN REDUCED TO ZERO. THE YIELD TO MATURITY OF EACH SUBCLASS OF OFFERED CLASS  B
CERTIFICATES  WILL BE MORE SENSITIVE THAN THAT  OF THE CLASS A CERTIFICATES, THE
CLASS M CERTIFICATES AND, IN THE CASE  OF THE CLASS B-2 CERTIFICATES, THE  CLASS
B-1  CERTIFICATES, TO THE AMOUNT AND TIMING OF LOSSES DUE TO LIQUIDATIONS OF THE
MORTGAGE LOANS IN  THE EVENT THAT  THE PRINCIPAL BALANCES  OF THE SUBCLASSES  OF
CLASS  B CERTIFICATES  WITH HIGHER NUMERICAL  DESIGNATIONS HAVE  BEEN REDUCED TO
ZERO.  SEE  "DESCRIPTION  OF  THE  CERTIFICATES  --  INTEREST,"  "--   PRINCIPAL
(INCLUDING   PREPAYMENTS)"  AND  "--  SUBORDINATION  OF  CLASS  M  AND  CLASS  B
CERTIFICATES" HEREIN AND "PREPAYMENT AND YIELD CONSIDERATIONS" HEREIN AND IN THE
PROSPECTUS.
 
    THE WEIGHTED  AVERAGE LIVES  OF THE  COMPANION CERTIFICATES  WILL BE  HIGHLY
SENSITIVE  TO THE RATE OF PREPAYMENTS ON  THE MORTGAGE LOANS. AT RATES ABOVE THE
CONSTANT PREPAYMENT RATE AT WHICH THE PRINCIPAL BALANCES OF THE TAC CERTIFICATES
AND THE COMPONENT PRINCIPAL BALANCE OF THE CLASS A-12 TAC ACCRUAL COMPONENT WILL
BE REDUCED TO THEIR TARGETED PERCENTAGES, PAYMENTS OF PRINCIPAL ALLOCATED TO THE
CLASS A  CERTIFICATES (OTHER  THAN THE  CLASS A-12  PO COMPONENT)  IN EXCESS  OF
AMOUNTS RESULTING FROM SUCH CONSTANT PREPAYMENT RATE WILL BE PAID TO THE HOLDERS
OF  THE COMPANION  CERTIFICATES PRIOR TO  BEING PAID  TO THE HOLDERS  OF THE TAC
CERTIFICATES AND THE CLASS A-12 TAC ACCRUAL COMPONENT, RESULTING IN A  REDUCTION
IN  THE WEIGHTED AVERAGE LIVES  OF THE COMPANION CERTIFICATES.  AT OR BELOW SUCH
CONSTANT PREPAYMENT RATE,  THE COMPANION CERTIFICATES  MAY RECEIVE NO  PRINCIPAL
PAYMENTS  FROM THE CLASS A NON-PO PRINCIPAL AMOUNT FOR EXTENDED PERIODS OF TIME,
RESULTING IN AN EXTENSION OF THE WEIGHTED AVERAGE LIVES THEREOF. SEE "PREPAYMENT
AND YIELD CONSIDERATIONS" HEREIN.
 
    The Offered Certificates, other than the Class A-R, Class A-LR, Class M  and
Offered  Class  B Certificates,  will  be issued  only  in book-entry  form (the
"Book-Entry Certificates"),  and  purchasers thereof  will  not be  entitled  to
receive  definitive certificates except  in the limited  circumstances set forth
herein. The Book-Entry  Certificates will be  registered in the  name of Cede  &
Co.,  as nominee of The Depository Trust  Company, which will be the "holder" or
"Certificateholder" of such  Certificates, as  such terms are  used herein.  See
"Description of the Certificates" herein.
 
    Each  Subclass and Class  of Offered Certificates is  offered in the minimum
denominations  described  herein   under  "Summary  Information   --  Forms   of
Certificates;  Denominations." It is intended  that the Offered Certificates not
be directly or indirectly held or beneficially owned in amounts lower than  such
minimum denominations.
 
    There  is currently  no secondary  market for  the Offered  Certificates and
there can be no  assurance that a  secondary market will develop  or, if such  a
market  does develop, that it will  provide Certificateholders with liquidity of
investment at any particular time or  for the life of the Offered  Certificates.
The  Underwriter intends to act  as a market maker  in the Offered Certificates,
subject to applicable provisions of federal and state securities laws and  other
regulatory requirements, but is under no obligation to do so and any such market
making  may be  discontinued at  any time.  There can  be no  assurance that any
investor will be  able to sell  an Offered Certificate  at a price  equal to  or
greater  than the price at which such Certificate was purchased. THE CLASS M AND
OFFERED CLASS B CERTIFICATES  MAY NOT BE TRANSFERRED  UNLESS THE TRANSFEREE  HAS
DELIVERED  (I) A  REPRESENTATION LETTER  TO THE  TRUSTEE AND  THE SELLER 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 HEREIN, THAT THE  SOURCE OF FUNDS USED TO  PURCHASE
THE  CLASS M OR  OFFERED CLASS B  CERTIFICATES IS AN  "INSURANCE COMPANY GENERAL
ACCOUNT"  OR  (II)  AN  OPINION  OF  COUNSEL  AS  PROVIDED  IN  THIS  PROSPECTUS
SUPPLEMENT.  IN ADDITION, THE CLASS  A-R AND CLASS A-LR  CERTIFICATES MAY NOT BE
PURCHASED BY OR TRANSFERRED  TO (I) A  "DISQUALIFIED ORGANIZATION," (II)  EXCEPT
UNDER  CERTAIN LIMITED CIRCUMSTANCES, A PERSON WHO IS NOT A "U.S. PERSON," (III)
A PLAN OR (IV) ANY  PERSON OR ENTITY WHO THE  TRANSFEROR KNOWS OR HAS REASON  TO
KNOW  WILL BE UNWILLING OR UNABLE TO PAY  WHEN DUE FEDERAL, STATE OR LOCAL TAXES
WITH RESPECT  THERETO.  See  "ERISA  Considerations"  and  "Description  of  the
Certificates  -- Restrictions on Transfer of the  Class A-R, Class A-LR, Class M
and Offered  Class  B  Certificates"  herein and  "Certain  Federal  Income  Tax
Consequences  --  Federal  Income  Tax Consequences  for  REMIC  Certificates --
Tax-Related  Restrictions  on   Transfer  of  Residual   Certificates"  in   the
Prospectus.
 
    For  federal income tax purposes, the Trust  Estate will consist of two real
estate mortgage investment conduits (each, a "REMIC" or, in the alternative, the
"Upper-Tier REMIC" and the "Lower-Tier REMIC," respectively). As described  more
fully  herein and in the Prospectus, 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 and Class
A-11 Certificates, the  Class A-12 TAC  Accrual Component, the  Class A-12 IO  A
Component,  the Class A-12  IO B Component,  the Class A-12  IO C Component, the
Class  A-12   PO   Component,  the   Class   A-13,  Class   A-14,   Class   A-15
 
                                      S-4
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
and  Class A-16 Certificates, the Class M  Certificates and the Class B-1, Class
B-2, Class B-3, Class  B-4 and Class B-5  Certificates will constitute  "regular
interests" in the Upper-Tier REMIC and the Class A-R and Class A-LR Certificates
will  constitute the "residual interest" in  the Upper-Tier REMIC and Lower-Tier
REMIC, respectively. PROSPECTIVE INVESTORS ARE CAUTIONED THAT THE CLASS A-R  AND
CLASS  A-LR CERTIFICATEHOLDERS' REMIC  TAXABLE INCOME AND  THE LIABILITY THEREON
MAY EXCEED, AND  MAY SUBSTANTIALLY  EXCEED, CASH DISTRIBUTIONS  TO SUCH  HOLDERS
DURING  CERTAIN  PERIODS,  IN  WHICH EVENT  SUCH  HOLDERS  MUST  HAVE SUFFICIENT
ALTERNATIVE SOURCES OF FUNDS TO PAY SUCH TAX LIABILITY. See "Summary Information
- -- Federal Income Tax Status" and "Federal Income Tax Considerations" herein and
"Certain Federal Income Tax Consequences -- Federal Income Tax Consequences  for
REMIC Certificates" in the Prospectus.
 
    The  Class A Certificates (other than the Class A-12 Certificates) represent
seventeen Subclasses of a Class, the Class M Certificates represent a Class  and
the  Offered Class B  Certificates represent two  Subclasses of a  Class, all of
which are part of a separate Series of Certificates being offered by the  Seller
pursuant  to the Prospectus  dated August 19,  1996 accompanying this Prospectus
Supplement.  Any   prospective  investor   should  not   purchase  any   Offered
Certificates  described herein  unless it has  received the  Prospectus and this
Prospectus Supplement. The Prospectus shall  not be considered complete  without
this  Prospectus  Supplement.  The  Prospectus  contains  important  information
regarding this offering which is not contained herein, and prospective investors
are urged to read, in full, the Prospectus and this Prospectus Supplement.
                             ---------------------
 
    UNTIL NOVEMBER 25, 1996, ALL  DEALERS EFFECTING TRANSACTIONS IN THE  OFFERED
CERTIFICATES, WHETHER OR NOT PARTICIPATING IN THIS DISTRIBUTION, MAY BE REQUIRED
TO  DELIVER A PROSPECTUS SUPPLEMENT  AND PROSPECTUS. THIS IS  IN ADDITION TO THE
OBLIGATION OF DEALERS  TO DELIVER  A PROSPECTUS SUPPLEMENT  AND PROSPECTUS  WHEN
ACTING   AS  UNDERWRITERS  AND  WITH  RESPECT  TO  THEIR  UNSOLD  ALLOTMENTS  OR
SUBSCRIPTIONS.
 
                                      S-5
<PAGE>
                               TABLE OF CONTENTS
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                                                                                             PAGE
                                                                                                           ---------
<S>                                                                                                        <C>
Summary Information......................................................................................        S-8
Risk Factors.............................................................................................       S-33
  General................................................................................................       S-33
  Subordination..........................................................................................       S-33
  Book-Entry System for Certain Classes and Subclasses of Certificates...................................       S-33
Description of the Certificates..........................................................................       S-34
  Denominations..........................................................................................       S-34
  Definitive Form........................................................................................       S-34
  Book-Entry Form........................................................................................       S-34
  Distributions..........................................................................................       S-34
  Interest...............................................................................................       S-38
  Principal (Including Prepayments)......................................................................       S-46
    Calculation of Amount to be Distributed to the Class A Certificates..................................       S-47
    Calculation of Amount to be Distributed to the Class A-12 PO Component...............................       S-50
    Calculation of Amount to be Distributed to the Class M and Class B Certificates......................       S-51
    Allocation of Amount to be Distributed...............................................................       S-54
    Principle Payment Characteristics of the TAC Certificates, the Class A-12 TAC Accrual Component and
     the Companion Certificates..........................................................................       S-61
  Additional Rights of the Class A-R and Class A-LR Certificateholders...................................       S-63
  Periodic Advances......................................................................................       S-63
  Restrictions on Transfer of the Class A-R, Class A-LR, Class M and Offered Class B Certificates........       S-64
  Reports................................................................................................       S-65
  Subordination of Class M and Class B Certificates......................................................       S-65
    Allocation of Losses.................................................................................       S-66
Description of the Mortgage Loans........................................................................       S-71
  General................................................................................................       S-71
  Mortgage Loan Data.....................................................................................       S-73
  Mandatory Repurchase or Substitution of Mortgage Loans.................................................       S-79
  Optional Repurchase of Defaulted Mortgage Loans........................................................       S-80
Delinquency and Foreclosure Experience...................................................................       S-80
Prepayment and Yield Considerations......................................................................       S-86
  Historic Loss Experience of PHMC-Serviced Mortgage Loans...............................................       S-98
  Yield Considerations with Respect to the Class B-1 and Class B-2 Certificates..........................       S-99
Pooling and Servicing Agreement..........................................................................      S-102
  General................................................................................................      S-102
  Distributions..........................................................................................      S-102
  Voting.................................................................................................      S-102
  Trustee................................................................................................      S-103
  Master Servicer........................................................................................      S-103
  Special Servicing Agreements...........................................................................      S-103
  Optional Termination...................................................................................      S-104
Servicing of the Mortgage Loans..........................................................................      S-104
  The Servicers..........................................................................................      S-104
  Servicer Custodial Accounts............................................................................      S-105
  Unscheduled Principal Receipts.........................................................................      S-105
</TABLE>
 
                                      S-6
<PAGE>
<TABLE>
<CAPTION>
                                                                                                             PAGE
                                                                                                           ---------
<S>                                                                                                        <C>
  Anticipated Changes in Servicing.......................................................................      S-106
  Fixed Retained Yield; Servicing Compensation and Payment of Expenses...................................      S-107
  Servicer Defaults......................................................................................      S-107
Federal Income Tax Considerations........................................................................      S-108
  Regular Certificates...................................................................................      S-108
  Residual Certificates..................................................................................      S-109
ERISA Considerations.....................................................................................      S-110
Legal Investment.........................................................................................      S-111
Secondary Market.........................................................................................      S-112
Underwriting.............................................................................................      S-112
Legal Matters............................................................................................      S-112
Use of Proceeds..........................................................................................      S-113
Ratings..................................................................................................      S-113
Index of Significant Prospectus Supplement Definitions...................................................      S-114
</TABLE>
 
                                      S-7
<PAGE>
                              SUMMARY INFORMATION
 
    THE  FOLLOWING IS  QUALIFIED IN  ITS ENTIRETY  BY REFERENCE  TO THE DETAILED
INFORMATION APPEARING  ELSEWHERE  IN  THIS  PROSPECTUS  SUPPLEMENT  AND  IN  THE
ACCOMPANYING  PROSPECTUS  (THE  "PROSPECTUS"). CAPITALIZED  TERMS  USED  IN THIS
PROSPECTUS SUPPLEMENT  AND  NOT  OTHERWISE  DEFINED  HEREIN  HAVE  THE  MEANINGS
ASSIGNED  IN  THE PROSPECTUS.  SEE "INDEX  OF SIGNIFICANT  PROSPECTUS SUPPLEMENT
DEFINITIONS" HEREIN AND "INDEX OF SIGNIFICANT DEFINITIONS" IN THE PROSPECTUS.
 
<TABLE>
<S>                               <C>
Title of Securities.............  Mortgage   Pass-Through   Certificates,   Series    1996-4
                                  Certificates  (the  "Series  1996-4  Certificates"  or the
                                  "Certificates").
Seller..........................  Norwest Asset Securities  Corporation (the "Seller").  The
                                  Mortgage  Loans will have been acquired by the Seller from
                                  Norwest Mortgage, Inc. ("Norwest Mortgage"), an  affiliate
                                  of  the Seller and the Master Servicer. The Mortgage Loans
                                  that the Seller acquires from Norwest Mortgage will either
                                  have been originated  by Norwest Mortgage  or acquired  by
                                  Norwest  Mortgage,  or an  affiliate of  Norwest Mortgage,
                                  from The Prudential Home  Mortgage Company, Inc.  ("PHMC")
                                  or  various  other  entities (each  other  such  entity, a
                                  "Norwest Mortgage Correspondent"), which either originated
                                  the Mortgage Loans or acquired the Mortgage Loans pursuant
                                  to mortgage loan purchase programs operated by the Norwest
                                  Mortgage Correspondents.  The Mortgage  Loans acquired  by
                                  Norwest   Mortgage  from   PHMC  will   either  have  been
                                  originated by PHMC or acquired by PHMC from various  other
                                  entities  (each  a  "PHMC  Correspondent").  None  of  the
                                  Norwest Mortgage Correspondents or PHMC Correspondents  is
                                  an affiliate of Norwest Mortgage.
Servicing/Servicers.............  Norwest  Mortgage and  one or more  other Servicers (which
                                  will be Norwest Mortgage Correspondents or PHMC Correspon-
                                  dents)  approved  by  the  Master  Servicer  will  provide
                                  customary servicing functions with respect to the Mortgage
                                  Loans   pursuant   to  servicing   agreements   (each,  an
                                  "Underlying Servicing  Agreement") assigned  to the  Trust
                                  Estate.  Among other  things, the  Servicers are obligated
                                  under certain circumstances to advance delinquent payments
                                  of principal  and interest  with respect  to the  Mortgage
                                  Loans.  Each of  the Servicers will  be entitled  to (i) a
                                  monthly Servicing Fee with  respect to each Mortgage  Loan
                                  it  services payable on each Distribution Date that is ex-
                                  pressed  as  one-twelfth  of   0.25%  multiplied  by   the
                                  scheduled  principal balance of such  Mortgage Loan on the
                                  first day of the month and (ii) other additional servicing
                                  compensation  described  herein.  See  "Servicing  of  the
                                  Mortgage Loans" herein and in the Prospectus.
Master Servicer.................  Norwest  Bank  Minnesota,  National  Association ("Norwest
                                  Bank" and, in its capacity as master servicer, the "Master
                                  Servicer").  Norwest  Bank  is  a  direct,  wholly   owned
                                  subsidiary  of Norwest Corporation and  is an affiliate of
                                  the Seller and Norwest Mortgage. The Master Servicer  will
                                  (a)  monitor  certain  aspects  of  the  servicing  of the
                                  Mortgage  Loans,  (b)  cause  the  Mortgage  Loans  to  be
                                  serviced  in the event that a Servicer is terminated and a
                                  successor  Servicer   is   not  appointed,   (c)   provide
                                  administrative  services with respect to the Certificates,
                                  (d) provide certain reports  to the Trustee regarding  the
                                  Mortgage
</TABLE>
 
                                      S-8
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Loans  and  the Certificates,  (e)  make advances,  to the
                                  extent described  herein,  with respect  to  the  Mortgage
                                  Loans if a Servicer (other than Norwest Mortgage) fails to
                                  make  a required  advance and  (f) make  payments to cover
                                  certain  prepayment   interest  shortfalls.   The   Master
                                  Servicer   will  be  entitled  to  (i)  a  monthly  Master
                                  Servicing Fee with respect to each Mortgage Loan,  payable
                                  on   each  Distribution  Date,  in   an  amount  equal  to
                                  one-twelfth of 0.02% multiplied by the scheduled principal
                                  balance of  such Mortgage  Loan on  the first  day of  the
                                  preceding  month and (ii) any  interest earned on funds in
                                  the  Certificate   Account.   See  "Description   of   the
                                  Certificates  -- Interest" and  "The Pooling and Servicing
                                  Agreement -- Master Servicer"  herein and "Norwest  Bank,"
                                  "Servicing  of the Mortgage Loans  -- The Master Servicer"
                                  and "Certain Matters Regarding the Master Servicer" in the
                                  Prospectus.
Trustee.........................  First  Bank  National  Association,  a  national   banking
                                  association  (the  "Trustee").  The  Trustee  will perform
                                  certain administrative  functions  and  will  act  as  the
                                  initial paying agent, certificate registrar and custodian.
                                  The  Trustee  will be  required to  make advances,  to the
                                  extent described  herein,  with respect  to  the  Mortgage
                                  Loans  if Norwest Mortgage,  as Servicer, fails  to make a
                                  required advance. See "Pooling and Servicing Agreement  --
                                  Trustee" in this Prospectus Supplement.
Rating of Certificates..........  It  is  a  condition  to  the  issuance  of  the  Class  A
                                  Certificates offered by this Prospectus Supplement and the
                                  Prospectus that they shall have been rated "AAA" by  Fitch
                                  Investors  Service, L.P.  ("Fitch") and  Standard & Poor's
                                  ("S&P"). It is a condition to the issuance of the Class  M
                                  Certificates that they shall have been rated at least "AA"
                                  by Fitch and S&P. It is a condition to the issuance of the
                                  Class  B-1 and Class B-2 Certificates that they shall have
                                  been rated at least "A" and "BBB," respectively, by Fitch.
                                  The ratings  of Fitch  on mortgage  pass-through  certifi-
                                  cates  address  the  likelihood  of  the  receipt  by  the
                                  certificateholders of all  distributions of principal  and
                                  interest  to which  such certificateholders  are entitled.
                                  The ratings of S&P  on mortgage pass-through  certificates
                                  address the likelihood of receipt by the
                                  certificateholders  of timely payment  of interest and the
                                  ultimate return of principal. The ratings by Fitch and S&P
                                  are  not  recommendations  to  buy,  sell  or  hold   such
                                  Certificates  and may be subject to revision or withdrawal
                                  at any time by the assigning rating agency. The ratings do
                                  not address the possibility that, as a result of principal
                                  prepayments, holders of  such Certificates  may receive  a
                                  lower   than  anticipated   yield.  See   "--  Effects  of
                                  Prepayments  on   Investment   Expectations"   below   and
                                  "Ratings" in this Prospectus Supplement.
Description of Certificates.....  The Series 1996-4 Certificates will consist of the Class A
                                  Certificates,  the Class  M Certificates  and the  Class B
                                  Certificates. The Class A Certificates represent a type of
                                  interest  referred  to  in   the  Prospectus  as   "Senior
                                  Certificates"  and the  Class M  and Class  B Certificates
                                  represent a  type  of interest  referred  to in  the  Pro-
                                  spectus   as   "Subordinated   Certificates."   As   these
                                  designations  suggest,  the   Class  A  Certificates   are
                                  entitled to a certain priority,
</TABLE>
 
                                      S-9
<PAGE>
 
<TABLE>
<S>                               <C>
                                  relative to the Class M and Class B Certificates, in right
                                  of  distributions on the mortgage loans underlying the Se-
                                  ries  1996-4  Certificates  (the  "Mortgage  Loans").   As
                                  between   the  Class  M  Certificates   and  the  Class  B
                                  Certificates, the Class M  Certificates are entitled to  a
                                  certain priority in right of distributions on the Mortgage
                                  Loans   and,   as  among   the   Subclasses  of   Class  B
                                  Certificates, the Subclasses  with lower numerical  desig-
                                  nations  are entitled  to a  certain priority  in right of
                                  distributions on  the  Mortgage Loans  relative  to  those
                                  Subclasses  with  higher numerical  designations.  See "--
                                  Distributions of Principal and Interest" below.
                                  The  Class  A  Certificates   will  consist  of   eighteen
                                  Subclasses  designated as 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-13, Class A-14,  Class A-15, Class  A-16, Class A-R  and
                                  Class A-LR Certificates. The Class M Certificates will not
                                  be  divided into Subclasses. The Class B Certificates will
                                  consist of five Subclasses,  designated as the Class  B-1,
                                  Class B-2, Class B-3, Class B-4 and Class B-5. The Class A
                                  Certificates (other than the Class A-12 Certificates), the
                                  Class  M  Certificates and  the  Class B-1  and  Class B-2
                                  Certificates are referred to in this Prospectus Supplement
                                  collectively as the "Offered Certificates." The Class  B-1
                                  and  Class  B-2  Certificates  are  referred  to  in  this
                                  Prospectus Supplement collectively as the "Offered Class B
                                  Certificates." The Class A-12  Certificates and the  Class
                                  B-3,  Class B-4 and Class B-5 Certificates are not offered
                                  hereby and may be retained or sold by the Seller.
                                  The Offered  Certificates have  the approximate  aggregate
                                  initial  principal balances set forth on the cover of this
                                  Prospectus  Supplement.   Any   difference   between   the
                                  aggregate  principal balance of  the Class A,  Class M and
                                  Offered Class B Certificates as of the date of issuance of
                                  the Series 1996-4 Certificates and the approximate initial
                                  aggregate principal balance of such Subclass and Class  as
                                  of  the date of this  Prospectus Supplement will not, with
                                  respect to  the Class  A Certificates,  exceed 5%  of  the
                                  initial   aggregate  principal  balance  of  the  Class  A
                                  Certificates as  stated on  the cover  of this  Prospectus
                                  Supplement  plus the expected initial principal balance of
                                  the Class A-12 Certificates and, with respect to the Class
                                  M Certificates  and  Offered Class  B  Certificates,  will
                                  depend  on the  final subordination levels  for the Series
                                  1996-4 Certificates. Any difference allocated to the Class
                                  A Certificates will  be allocated  to one or  more of  the
                                  Subclasses  of Class A Certificates,  other than the Class
                                  A-R and Class A-LR Certificates.
                                  The following table sets forth for each Class and Subclass
                                  indicated  and  for  the  Class  A-12  PO  Component   the
                                  approximate undivided percentage interest in the principal
                                  balance  of  the Mortgage  Loans  that is  expected  to be
                                  evidenced in the aggregate by such Class, Subclass and the
                                  Class A-12 PO Component as of the Closing Date.
</TABLE>
 
                                      S-10
<PAGE>
 
<TABLE>
<CAPTION>
                                                                                          APPROXIMATE INITIAL
                                                                                         UNDIVIDED PERCENTAGE
                                                  CLASS, SUBCLASS OR COMPONENT                 INTEREST
                                         ----------------------------------------------  ---------------------
<S>                                      <C>                                             <C>        <C>
                                         Class A (other than the Class A-12 PO           92.72%
                                          Component)
                                         Class A-12 PO Component*                        1.28%
                                                                                         ---------
                                           Class A (including the Class A-12 PO                     94.00%
                                             Component)
                                         Class M                                                    2.50%
                                         Class B-1                                                  1.25%
                                         Class B-2                                                  1.00%
                                         Classes B-3, B-4 and B-5                                   1.25%
                                                                                                    ----------
                                         Total                                                      100.00%
                                                                                                    ----------
                                                                                                    ----------
</TABLE>
 
<TABLE>
<S>                               <C>
                                  *  The Class A-12  PO Component represents an  approximate
                                  3.85%  initial  interest  in  portions  of  the  principal
                                  balances of  the  Mortgage  Loans (such  portions  in  the
                                  aggregate,  the "Pool Balance (PO Portion)") that have Net
                                  Mortgage Interest Rates as defined  on page S-42, of  less
                                  than 7.75% (the "Discount Mortgage Loans").
</TABLE>
 
        ------------------------------------------------------------------------
 
<TABLE>
<S>                               <C>
                                  By  virtue of the subordination of the Class M and Class B
                                  Certificates, it  is  possible  that  the  Class  A-12  PO
                                  Component  may also receive  support from certain payments
                                  made with respect to the other Mortgage Loans in the Trust
                                  Estate. The  Class A  Certificates (other  than the  Class
                                  A-12 PO Component), the Class M Certificates and the Class
                                  B Certificates will evidence the entire remaining interest
                                  in  the principal balance of the Mortgage Loans (the "Pool
                                  Balance (Non-PO Portion)").
                                  The following table  sets forth for  each Class  indicated
                                  the  approximate  undivided interest  in the  Pool Balance
                                  (Non-PO Portion) that is expected  to be evidenced in  the
                                  aggregate by such Class as of the Closing Date.
 
                                                                                  APPROXIMATE
                                                                                  INITIAL
                                                                                  UNDIVIDED
                                                                                  INTEREST
 
                                                          CLASS                   PERCENTAGE     IN DOLLARS
                                         ---------------------------------------  ----------  ----------------
 
                                         CLASS A (OTHER THAN THE CLASS A-12 PO        93.92%  $    355,304,000
                                           COMPONENT)
 
                                         CLASS M                                       2.53%  $      9,580,000
 
                                         CLASS B                                       3.55%  $     13,411,621
                                                                                  ----------  ----------------
 
                                           TOTALS                                    100.00%  $    378,295,621
</TABLE>
 
<TABLE>
<S>                               <C>
 
                                  The relative interests in the initial Pool Balance (Non-PO
                                  Portion)  represented by  the Class  A Certificates (other
                                  than  the   Class  A-12   PO  Component),   the  Class   M
                                  Certificates  and the Class B  Certificates are subject to
                                  change  over   time   because  of   the   disproportionate
                                  allocation  of certain  unscheduled principal  payments to
                                  the Class A  Certificates (other  than the  Class A-12  PO
                                  Component)  for a  specified period and  the allocation of
                                  certain  losses  and  certain  shortfalls  first  to   the
                                  Subclasses  of Class  B Certificates  in reverse numerical
 
</TABLE>
                                      S-11
 
<PAGE>
 
<TABLE>
<S>                               <C>
                                  order, and then to the  Class M Certificates prior to  the
                                  allocation  of such losses  and shortfalls to  the Class A
                                  Certificates,  as  discussed   in  "--  Distributions   of
                                  Principal and Interest" and "-- Credit Enhancement" below.
                                  The Class A-12 Certificates, which are not offered hereby,
                                  will  be  deemed to  consist  of five  components  (each a
                                  "Component" or a  "Class A-12  Component"), consisting  of
                                  three  interest-only  components  (the  "Class  A-12  IO A
                                  Component," the "Class A-12 IO B Component" and the "Class
                                  A-12 IO  C  Component"),  a  targeted  amortization  class
                                  Component  which is also an  accrual Component (the "Class
                                  A-12  TAC   Accrual  Component")   and  a   principal-only
                                  Component (the "Class A-12 PO Component").
</TABLE>
 
- --------------------------------------------------------------------------------
 
                COMPONENT PRINCIPAL BALANCES AND COMPONENT RATES
 
<TABLE>
<CAPTION>
                                                                          APPROXIMATE
                                                                  INITIAL COMPONENT PRINCIPAL         COMPONENT
                          COMPONENT                                         BALANCE                     RATE
- -------------------------------------------------------------  ---------------------------------  -----------------
<S>                                                            <C>                                <C>
Class A-12 TAC Accrual Component.............................          $      29,488,843                  7.75%
Class A-12 PO Component......................................          $       4,885,810                 (1)
Class A-12 IO A Component....................................                 (2)                        (3)
Class A-12 IO B Component....................................                 (2)                      (4)
Class A-12 IO C Component....................................                 (2)                      (5)
</TABLE>
 
- ------------------------------
(1)  The  Class A-12  PO Component  is a  principal-only Component  and will not
     accrue interest on its component principal balance.
 
(2)  This Component is an interest-only Component and has no principal balance.
 
(3)  Interest will accrue  on the Class  A-12 IO  A Component each  month in  an
     amount  equal to the sum  of (i) the product of  1/12th of 0.35000% and the
     then-outstanding principal balance of the  Class A-8 Certificates and  (ii)
     the  product of 1/12th  of approximately 0.17724%  and the then-outstanding
     principal balance of the Class A-15 Certificates.
 
(4)  Interest will accrue  on the Class  A-12 IO  B Component each  month in  an
     amount  equal to the sum  of (i) the product of  1/12th of 0.60000% and the
     then-outstanding principal balance of the Class A-9 Certificates, (ii)  the
     product of 1/12th of 0.55000% and the then-outstanding principal balance of
     the   Class  A-14  Certificates   and  (iii)  the   product  of  1/12th  of
     approximately 0.07276% and  the then-outstanding principal  balance of  the
     Class A-15 Certificates.
 
(5)  Interest  will accrue  on the Class  A-12 IO  C Component each  month in an
     amount equal  to  the product  of  1/12 of  0.75000%  and the  sum  of  the
     then-outstanding  principal balances of the Class A-2, Class A-10 and Class
     A-16 Certificates.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                               <C>
                                  The principal balance of the Class A-12 Certificates  will
                                  equal  the sum of the  component principal balances of the
                                  Components. The holder  of a Class  A-12 Certificate  will
                                  not  have a severable  interest in any  Component but will
                                  have an undivided interest in the entire Subclass.
                                  The Class A-7, Class A-8, Class A-9, Class A-14 and  Class
                                  A-15   Certificates   are   targeted   amortization  class
                                  certificates (referred to herein collectively as the  "TAC
                                  Certificates") and the Class A-12 TAC Accrual Component is
                                  a  targeted amortization class Component because, based on
                                  certain assumptions  described in  the last  paragraph  on
                                  page S-90, if prepayments on the Mortgage Loans occur at a
                                  constant rate of approximately 235% SPA (as defined herein
                                  under   "Prepayment  and  Yield  Considerations"),  it  is
                                  expected  that  their  principal  balances  or   component
</TABLE>
 
                                      S-12
<PAGE>
 
<TABLE>
<S>                               <C>
                                  principal  balance would be reduced  to the percentages of
                                  their initial  principal  balances and  initial  component
                                  principal  balance for each Distribution Date indicated in
                                  the tables beginning on page  S-57. However, IT IS  HIGHLY
                                  UNLIKELY  THAT PRINCIPAL PREPAYMENTS ON THE MORTGAGE LOANS
                                  WILL OCCUR AT ANY CONSTANT RATE OR THAT THE MORTGAGE LOANS
                                  WILL PREPAY AT  THE SAME  RATE. The Class  A-11 and  Class
                                  A-13   Certificates  are   called  companion  certificates
                                  (referred  to  herein   collectively  as  the   "Companion
                                  Certificates")  because payments of principal allocated to
                                  the Class A  Certificates (other  than the  Class A-12  PO
                                  Component)   in  excess  of  amounts  resulting  from  the
                                  constant prepayment rate at  which the principal  balances
                                  and  component principal  balance of  the TAC Certificates
                                  and the Class A-12 TAC  Accrual Component will be  reduced
                                  to  their targeted percentages will be paid to the holders
                                  of the  Companion  Certificates, while  such  Certificates
                                  remain  outstanding, prior to being paid to the holders of
                                  the TAC Certificates and the Class A-12 Certificates  with
                                  respect  to  the  Class A-12  TAC  Accrual  Component. See
                                  "Description of the  Certificates -- Principal  (Including
                                  Prepayments)  -- Allocation  of Amount  to be Distributed"
                                  and "  -- Principal  Payment  Characteristics of  the  TAC
                                  Certificates, the Class A-12 TAC Accrual Component and the
                                  Companion Certificates" in this Prospectus Supplement.
                                  Prior  to their respective Accretion Termination Dates (as
                                  defined on page S-44), interest due to the holders of  the
                                  Class  A-11 Certificates  and the  Class A-12 Certificates
                                  with respect to the Class A-12 TAC Accrual Component  will
                                  not  be  paid currently  as  interest on  any Distribution
                                  Date,  but,   instead,  such   amounts  will   be   added,
                                  respectively,  to the principal  balance and the component
                                  principal balance  thereof.  On  each  Distribution  Date,
                                  prior  to their respective  Accretion Termination Dates an
                                  amount equal to  the accrued  and unpaid  interest on  the
                                  Class  A-11 Certificates and on the Class A-12 TAC Accrual
                                  Component  will  be  distributed   in  reduction  of   the
                                  principal  balances of  the Class  A-2, Class  A-10, Class
                                  A-13 and  Class  A-16  Certificates  (referred  to  herein
                                  collectively  as  the "Accretion  Directed Certificates"),
                                  the Class A-11 Certificates and the Class A-12 TAC Accrual
                                  Component   to   the   extent   described   herein   under
                                  "Description  of the Certificates  -- Principal (Including
                                  Prepayments) -- Allocation of Amount to be Distributed."
Forms of Certificates;
 Denominations..................  The  Offered  Certificates  will   be  issued  either   in
                                  book-entry  form or in fully registered, certificated form
                                  ("Definitive  Certificates").  The  following  table  sets
                                  forth   the   original  certificate   form,   the  minimum
                                  denomination  and  the  incremental  denomination  of  the
                                  Offered  Certificates.  The Offered  Certificates  are not
                                  intended to be directly or indirectly held or beneficially
                                  owned in amounts  lower than  such minimum  denominations.
                                  See "Descriptions of the Certificates -- Denominations" in
                                  this Prospectus Supplement.
</TABLE>
 
                                      S-13
<PAGE>
- --------------------------------------------------------------------------------
 
                 FORM AND DENOMINATIONS OF OFFERED CERTIFICATES
 
<TABLE>
<CAPTION>
                                                             ORIGINAL CERTIFICATE       MINIMUM      INCREMENTAL
                    CLASS OR SUBCLASS                                FORM            DENOMINATION   DENOMINATION
- ----------------------------------------------------------  -----------------------  -------------  -------------
<S>                                                         <C>                      <C>            <C>
Classes A-1*, A-2*, A-5*, A-6*, A-7*, A-8*, A-10*, A-11*,
 A-13*, A-14, A-15* and A-16..............................  Book-Entry                $   100,000     $   1,000
Classes A-3, A-4 and A-9..................................  Book-Entry                $     1,000     $   1,000
Class M...................................................  Definitive                $   100,000     $   1,000
Classes B-1 and B-2.......................................  Definitive                $   100,000     $   1,000
Classes A-R and A-LR......................................  Definitive                $       100           N/A
</TABLE>
 
- ------------------------------
*    In  order to aggregate the original principal balance of such Subclass, one
     Certificate of such Subclass will be issued in an incremental  denomination
     of less than that shown.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                 <C>
                                    BOOK-ENTRY  FORM. The  Offered Certificates,  other than
                                    the Class A-R and Class A-LR, Class M and Offered  Class
                                    B  Certificates,  will  be  issued  in  book-entry form,
                                    through the facilities of  The Depository Trust  Company
                                    ("DTC"). These Certificates are referred to collectively
                                    in   this  Prospectus  Supplement   as  the  "Book-Entry
                                    Certificates." An investor in  a Subclass of  Book-Entry
                                    Certificates  will  not receive  a  physical certificate
                                    representing its ownership interest in such Book-  Entry
                                    Certificates,  except under  extraordinary circumstances
                                    which are discussed in "Description of the  Certificates
                                    -- Book-Entry Form" in the Prospectus. Instead, DTC will
                                    effect payments and transfers by means of its electronic
                                    recordkeeping    services,   acting    through   certain
                                    participating organizations. This may result in  certain
                                    delays  in receipt  of distributions by  an investor and
                                    may  restrict  an  investor's  ability  to  pledge   its
                                    securities.  The rights of investors  in the Book- Entry
                                    Certificates may generally only be exercised through DTC
                                    and its participating organizations. See "Description of
                                    the Certificates  -- Denominations"  and "--  Book-Entry
                                    Form"  in this Prospectus Supplement and "Description of
                                    the Certificates -- Book-Entry Form" in the Prospectus.
                                    DEFINITIVE FORM. The Class A-R, Class A-LR, Class M  and
                                    Offered  Class  B Certificates  will  each be  issued as
                                    Definitive  Certificates.   See  "Description   of   the
                                    Certificates  -- Denominations" and "-- Definitive Form"
                                    in this Prospectus  Supplement and  "Description of  the
                                    Certificates -- Definitive Form" in the Prospectus.
Mortgage Loans....................  GENERAL.  The Mortgage  Loans, which  are the  source of
                                    distributions  to   holders   of   the   Series   1996-4
                                    Certificates,   will  consist   of  conventional,  fixed
                                    interest rate, monthly  pay, fully  amortizing, one-  to
                                    four-family,  residential  first mortgage  loans, having
                                    original  terms   to   stated  maturity   ranging   from
                                    approximately  20 to  approximately 30  years, which may
                                    include loans secured  by shares  issued by  cooperative
                                    housing corporations. The Mortgage Loans are expected to
                                    have   the  further  specifications  set  forth  in  the
                                    following table and  under the  heading "Description  of
                                    the Mortgage Loans" in this Prospectus Supplement.
</TABLE>
 
                                      S-14
<PAGE>
SELECTED MORTGAGE LOAN DATA(1)
(AS OF THE CUT-OFF DATE)
 
<TABLE>
<S>                                                               <C>
Cut-Off Date:                                                     August 1, 1996
Number of Mortgage Loans:                                         1,357
Aggregate Unpaid Principal Balance(2):                            $383,181,431
Range of Unpaid Principal Balances(2):                            $31,834 to $1,949,470
Average Unpaid Principal Balance(2):                              $282,374
Range of Mortgage Interest Rates:                                 6.875% to 10.000%
Weighted Average Mortgage Interest Rate(2):                       8.306%
Range of Remaining Terms to Stated Maturity:                      234 months to 360 months
Weighted Average Remaining Term to Stated Maturity(2):            356 months
Range of Original Loan-to-Value Ratios(2):                        17.39% to 95.04%
Weighted Average Original Loan-to-Value Ratio(2):                 76.96%
Geographic Concentration of Mortgaged Properties
 Securing Mortgage Loans in Excess of 5% of the
 Aggregate Unpaid Principal Balance(2):                           California         28.92%
                                                                  New York          8.82%
                                                                  New Jersey        7.07%
                                                                  Florida            6.61%
                                                                  Georgia            6.19%
Maximum Five-Digit Zip Code Concentration(2):                     0.69%
</TABLE>
 
- ------------------------------
(1)  Information  concerning the  Discount Mortgage  Loans and  Premium Mortgage
     Loans is set forth under "Description of the Mortgage Loans -- General."
 
(2)  Approximate.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                               <C>
                                  PHMC ACQUISITION.  On May 7, 1996 Norwest Mortgage and  an
                                  affiliate  acquired from PHMC certain mortgage loans and a
                                  substantial portion of PHMC's mortgage servicing portfolio
                                  (such transaction  the "PHMC  Acquisition"). The  Mortgage
                                  Loans included in the Trust Estate consist of (i) Mortgage
                                  Loans  originated by  Norwest Mortgage or  an affiliate or
                                  purchased  by  Norwest  Mortgage  or  an  affiliate   from
                                  originators  other  than  PHMC  and  (ii)  Mortgage  Loans
                                  originated or purchased  by PHMC and  acquired by  Norwest
                                  Mortgage  or an  affiliate from PHMC  as part  of the PHMC
                                  Acquisition. See "Norwest Mortgage" in the prospectus.
                                  CHANGES TO POOL.  Mortgage  Loans may be removed from  the
                                  pool,  or a substitution may  be made for certain Mortgage
                                  Loans, in advance  of the  issuance of  the Series  1996-4
                                  Certificates  (which  is  expected to  occur  on  or about
                                  August  27,  1996)  (the  "Closing  Date").  Any  of  such
                                  Mortgage  Loans may be excluded  from the Trust Estate (i)
                                  as a result  of principal  prepayment thereof  in full  or
                                  (ii)  if, as a  result of delinquencies  or otherwise, the
                                  Seller  otherwise  deems   such  exclusion  necessary   or
                                  desirable.  In either  event, other Mortgage  Loans may be
                                  included in the Trust Estate.  This may result in  changes
                                  in  certain of the  pool characteristics set  forth in the
                                  table above and elsewhere  in this Prospectus  Supplement.
                                  In  the event  that any of  the characteristics  as of the
                                  Cut-Off Date  of the  Mortgage Loans  that constitute  the
                                  Trust Estate on the date of initial
</TABLE>
 
                                      S-15
<PAGE>
 
<TABLE>
<S>                               <C>
                                  issuance of the Series 1996-4 Certificates vary materially
                                  from those described herein, revised information regarding
                                  the Mortgage Loans will be made available to purchasers of
                                  the  Offered Certificates on or before such issuance date,
                                  and  a  Current  Report   on  Form  8-K  containing   such
                                  information will be filed with the Securities and Exchange
                                  Commission  within 15  days following  such issuance date.
                                  See "Description of the Mortgage Loans" in this Prospectus
                                  Supplement.
                                  Subsequent  to   the  issuance   of  the   Series   1996-4
                                  Certificates,  certain Mortgage Loans  may be removed from
                                  the   pool   through   repurchase   or,   under    certain
                                  circumstances,  through substitution by the Seller, if the
                                  Mortgage  Loans   are   discovered   to   have   defective
                                  documentation  or if they otherwise  do not conform to the
                                  standards established by the Seller's representations  and
                                  warranties concerning the Mortgage Loans. See "Description
                                  of   the  Mortgage   Loans  --   Mandatory  Repurchase  or
                                  Substitution  of  Mortgage   Loans"  in  this   Prospectus
                                  Supplement.
Optional Termination............  The  Seller  is  entitled, subject  to  certain conditions
                                  relating to  the  then-remaining  size  of  the  pool,  to
                                  purchase  all outstanding  Mortgage Loans in  the pool and
                                  thereby effect  early  retirement  of  the  Series  1996-4
                                  Certificates.  See  "Pooling  and  Servicing  Agreement --
                                  Optional Termination" in this Prospectus Supplement.
Underwriting Standards..........  Approximately 88.79% (by Cut-Off Date Aggregate  Principal
                                  Balance)  of the Mortgage  Loans were generally originated
                                  in conformity with the underwriting standards described in
                                  the  Prospectus  under  the  heading  "The  Mortgage  Loan
                                  Programs -- Mortgage Loan Underwriting -- Norwest Mortgage
                                  Underwriting"  (the "Underwriting  Standards"). In certain
                                  instances, exceptions  to the  Underwriting Standards  may
                                  have  been granted by  Norwest Mortgage or  PHMC. See "The
                                  Mortgage Loan Programs --  Mortgage Loan Underwriting"  in
                                  the  Prospectus.  The  remaining  approximate  11.21%  (by
                                  Cut-Off Date Aggregate Principal Balance) of the  Mortgage
                                  Loans  were purchased by Norwest  Mortgage or PHMC in bulk
                                  purchase  transactions   and   were   underwritten   using
                                  underwriting   standards   which   may   vary   from   the
                                  Underwriting Standards  (the "Bulk  Purchase  Underwritten
                                  Loans").  However, Norwest  Mortgage or  PHMC has  in each
                                  case reviewed the underwriting standards applied for  such
                                  Bulk  Purchase Underwritten Loans and determined that such
                                  variances did not depart materially from the  Underwriting
                                  Standards. See "Description of the Mortgage Loans" in this
                                  Prospectus  Supplement and "The  Mortgage Loan Programs --
                                  Mortgage Loan Underwriting" in the Prospectus.
Distributions of Principal and
 Interest.......................  DISTRIBUTIONS IN  GENERAL.   Distributions on  the  Series
                                  1996-4  Certificates will be made on  the 25th day of each
                                  month, or,  if such  day is  not a  business day,  on  the
                                  succeeding  business day (each such date is referred to in
                                  this Prospectus Supplement as a
</TABLE>
 
                                      S-16
<PAGE>
 
<TABLE>
<S>                               <C>
                                  "Distribution Date"),  commencing  in September  1996,  to
                                  holders  of record  at the close  of business  on the last
                                  business day of the  preceding month. In  the case of  the
                                  Book-Entry Certificates, the holder of record will be Cede
                                  & Co., as nominee of DTC.
                                  The  amount available for distribution on any Distribution
                                  Date is primarily a function of (i) the amount remitted by
                                  mortgagors of  the  Mortgage  Loans in  payment  of  their
                                  scheduled installments of principal and interest, (ii) the
                                  amount  of prepayments  made by  the mortgagors  and (iii)
                                  proceeds from liquidations of defaulted Mortgage Loans.
                                  On  any  Distribution  Date,   holders  of  the  Class   A
                                  Certificates  will be entitled to  receive all amounts due
                                  them (other  than the  Class  A-12 PO  Component  Deferred
                                  Amount,  as defined on page S-50) before any distributions
                                  are  made  to  holders  of   the  Class  M  and  Class   B
                                  Certificates  on  that Distribution  Date. The  Class A-12
                                  Certificates, with  respect to  Class A-12  PO  Component,
                                  will  be entitled to  receive the Class  A-12 PO Component
                                  Deferred Amount  as described  below. The  amount that  is
                                  available  to be distributed on any Distribution Date will
                                  be allocated  first to  pay interest  due holders  of  the
                                  Class  A Certificates  (including the amount  added to the
                                  principal balances of the Class A-11 Certificates and  the
                                  Class A-12 Certificates with respect to the Class A-12 TAC
                                  Accrual  Component) and then, if  the amount available for
                                  distribution exceeds the amount of interest due holders of
                                  the Class A Certificates, to pay the principal due to  the
                                  Class  A  Certificates.  As described  under  "-- Interest
                                  Distributions" below, prior to their respective  Accretion
                                  Termination Dates an amount equal to the amount accrued in
                                  respect  of interest on the Class A-11 Certificates and on
                                  the Class A-12 TAC  Accrual Component will be  distributed
                                  in  reduction  of  the  principal  balances  and component
                                  principal balance of the Accretion Directed  Certificates,
                                  the Class A-11 Certificates and the Class A-12 TAC Accrual
                                  Component   to   the   extent   described   herein   under
                                  "Description of the  Certificates -- Principal  (including
                                  Prepayments)  -- Allocation of  Amount to be Distributed,"
                                  rather than as interest to  the holders of the Class  A-11
                                  Certificates  and the Class A-12 Certificates with respect
                                  to the Class  A-12 TAC Accrual  Component. The  likelihood
                                  that  a  holder  of  a  particular  Subclass  of  Class  A
                                  Certificates will receive  principal distributions on  any
                                  Distribution  Date will  depend on  the priority  in which
                                  such Subclass is entitled  to principal distributions,  as
                                  set   forth   under  the   heading  "Description   of  the
                                  Certificates  --  Principal  (Including  Prepayments)   --
                                  Allocation   of   Amount  to   be  Distributed"   and  "--
                                  Calculation of Amount  to be  Distributed to  the Class  A
                                  Certificates" in this Prospectus Supplement.
                                  After  all amounts due on  the Class A Certificates (other
                                  than the  Class A-12  PO Component  Deferred Amount)  have
                                  been  paid, the  amount remaining will  be distributed, in
                                  the  following  order,  to  pay  (i)  any  Class  A-12  PO
                                  Component Deferred Amount first
</TABLE>
 
                                      S-17
<PAGE>
 
<TABLE>
<S>                               <C>
                                  from  amounts otherwise distributable  as principal on the
                                  Subclasses of Class  B Certificates  in reverse  numerical
                                  order (I.E., first from amounts otherwise distributable as
                                  principal on the Class B-5 Certificates, then from amounts
                                  otherwise  distributable  as  principal on  the  Class B-4
                                  Certificates, and so on), and then from amounts  otherwise
                                  distributable  as principal  on the  Class M Certificates,
                                  (ii)  interest  due  to  the   holders  of  the  Class   M
                                  Certificates,  (iii) principal  due to the  holders of the
                                  Class M  Certificates less  any amounts  used to  pay  the
                                  Class  A-12  PO Component  Deferred  Amount and  (iv) with
                                  respect  to  each   Subclass  of   Class  B   Certificates
                                  sequentially  in  numerical  order interest  due  and then
                                  principal due  to the  holders of  each such  Subclass  of
                                  Class  B  Certificates before  any  Subclasses of  Class B
                                  Certificates with  higher numerical  designations  receive
                                  any payments in respect of interest or principal, provided
                                  that the principal due any Subclass will be reduced by any
                                  amount  used to pay  the Class A-12  PO Component Deferred
                                  Amount.  See   "Description   of   the   Certificates   --
                                  Distributions" in this Prospectus Supplement.
                                  If any mortgagor is delinquent in the payment of principal
                                  or   interest  on  a  Mortgage  Loan  in  any  month,  the
                                  respective Servicer is  required to  advance such  payment
                                  unless such Servicer determines that the delinquent amount
                                  will  not be  recoverable by such  Servicer from insurance
                                  proceeds, liquidation proceeds or other recoveries on  the
                                  related Mortgage Loan. The Master Servicer or Trustee may,
                                  in   certain  circumstances,  be  required  to  make  such
                                  advances upon a  Servicer's default on  its obligation  to
                                  advance.  See "Description of the Certificates -- Periodic
                                  Advances" in this Prospectus Supplement.
                                  INTEREST DISTRIBUTIONS.  The  amount of interest to  which
                                  holders  of each Subclass or Class of Offered Certificates
                                  will be entitled  each month  is calculated  based on  the
                                  outstanding  principal balance of  such Subclass or Class,
                                  as of the related Distribution Date. Interest will  accrue
                                  each month on each such Subclass or Class according to the
                                  following  formula:  1/12th of  the Pass-Through  Rate for
                                  such Subclass  or  Class  multiplied  by  the  outstanding
                                  principal  balance  of such  Subclass or  Class as  of the
                                  related Distribution  Date.  The "Pass-Through  Rate"  for
                                  each  Subclass  or Class  of  Offered Certificates  is the
                                  percentage set  forth  on  the cover  of  this  Prospectus
                                  Supplement.
                                  Interest  will accrue on the  Class A-12 Certificates each
                                  month in  an  amount equal  to  the sum  of  the  interest
                                  accrued on the Class A-12 TAC Accrual Component, the Class
                                  A-12 IO A Component, the Class A-12 IO B Component and the
                                  Class  A-12 IO  C Component.  Interest will  accrue on the
                                  Class A-12 TAC Accrual Component at the rate of 1/12th  of
                                  the  Component Rate for such  component on the outstanding
                                  component  principal  balance   of  such  component.   The
                                  "Component  Rate" for the Class A-12 TAC Accrual Component
                                  is 7.75% per annum. Interest will accrue on the Class A-12
                                  IO A Component, the
</TABLE>
 
                                      S-18
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Class A-12  IO  B  Component  and  the  Class  A-12  IO  C
                                  Component  as  described on  pages S-38  and S-39  of this
                                  Prospectus Supplement.
                                  Holders of each Subclass  or Class of Certificates  (other
                                  than  the  Class A-11  Certificates)  will be  entitled to
                                  receive distributions  of  interest on  each  Distribution
                                  Date.  Holders of the Class A-12 Certificates (i) will not
                                  be entitled  to  receive distributions  of  interest  with
                                  respect  to the Class A-12 PO  Component and (ii) will not
                                  be entitled  to  receive distributions  of  interest  with
                                  respect  to the Class A-12 TAC Accrual Component until its
                                  Accretion  Termination  Date.  See  "Description  of   the
                                  Certificates  -- Interest" in  this Prospectus Supplement.
                                  Until their  respective Accretion  Termination Dates,  the
                                  amount  of interest to which the holders of the Class A-11
                                  Certificates and Class A-12  Certificates with respect  to
                                  the Class A-12 TAC Accrual Component are entitled will not
                                  be  distributed as  interest to  such holders  but instead
                                  will be added, respectively,  to the principal balance  of
                                  the Class A-11 Certificates and to the component principal
                                  balance of the Class A-12 TAC Accrual Component. An amount
                                  equal  to the amount  of interest that  has accrued but is
                                  not currently  distributable  on the  Class  A-11  Certif-
                                  icates  and on the Class A-12 Certificates with respect to
                                  the Class  A-12  TAC  Accrual Component  will  instead  be
                                  distributed,  respectively, in reduction  of the principal
                                  balances and component principal balance of the  Accretion
                                  Directed Certificates, the Class A-11 Certificates and the
                                  Class  A-12 TAC Accrual Component  to the extent described
                                  under the  heading  "Description of  the  Certificates  --
                                  Principal  (Including Prepayments) -- Allocation of Amount
                                  to be Distributed" in this Prospectus Supplement.
                                  When mortgagors  prepay  principal or  when  principal  is
                                  recovered  through foreclosures  or other  liquidations of
                                  defaulted Mortgage Loans, a full month's interest for  the
                                  month of payment or recovery may not be paid or recovered,
                                  resulting   in   interest   shortfalls.   These   interest
                                  shortfalls are variously handled, depending on the  nature
                                  of the event resulting in the interest shortfall.
                                  In  the case of principal  prepayments IN FULL, the Master
                                  Servicer will  be obligated  to cover  resulting  interest
                                  shortfalls  with  respect  to a  Distribution  Date  in an
                                  amount (such amount,  "Compensating Interest")  up to  the
                                  lesser  of (a) the product of (i) 1/12th of 0.20% and (ii)
                                  the aggregate scheduled principal balance of the  Mortgage
                                  Loans  with respect to such  Distribution Date and (b) the
                                  Available   Master   Servicing   Compensation   for   such
                                  Distribution Date.
                                  Shortfalls   in  collection  of  interest  resulting  from
                                  principal prepayments in full,  to the extent they  exceed
                                  the  amount  of Compensating  Interest  with respect  to a
                                  Distribution Date  ("Non-Supported Interest  Shortfalls"),
                                  will  be allocated pro rata among the Class A Certificates
                                  (after subtracting the component principal balance of  the
                                  Class A-12 PO Component), the Class M
</TABLE>
 
                                      S-19
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Certificates  and the Class B Certificates, based on their
                                  then-outstanding principal balances. The amount  allocated
                                  to  the Class A or Class  B Certificates will be allocated
                                  pro rata  among  the Subclasses  of  Class A  or  Class  B
                                  Certificates,  as  the  case  may  be,  based  on interest
                                  accrued.
                                  Interest  shortfalls  resulting  from  partial   principal
                                  prepayments  will not  be covered by  the Master Servicer,
                                  but instead will be borne first by the Subclasses of Class
                                  B Certificates in reverse  numerical order, second by  the
                                  Class  M Certificates and finally, pro rata by the Class A
                                  Certificates. See  "Description  of  the  Certificates  --
                                  Subordination of Class M and Class B Certificates" in this
                                  Prospectus Supplement.
                                  In  addition,  the  amount  of  interest  required  to  be
                                  distributed to holders of  the Series 1996-4  Certificates
                                  will  be reduced  by a  portion of  certain Special Hazard
                                  Losses, Fraud Losses and Bankruptcy Losses attributable to
                                  interest. See  "-- Credit  Enhancement --  Extent of  Loss
                                  Coverage"  below and  "Description of  the Certificates --
                                  Interest" in this Prospectus Supplement.
                                  To the extent that  the amount available for  distribution
                                  on  any Distribution  Date is  insufficient to  permit the
                                  distribution of the applicable amount of accrued  interest
                                  on  the Class A Certificates (including any interest to be
                                  added  to  the  principal   balance  of  the  Class   A-11
                                  Certificates  and the  component principal  balance of the
                                  Class A-12 TAC  Accrual Component,  respectively) (net  of
                                  any Non-Supported Interest Shortfall, other shortfalls and
                                  losses  allocable to the Class A Certificates as described
                                  above), the amount of interest  to be distributed will  be
                                  allocated  among  the  outstanding Subclasses  of  Class A
                                  Certificates   in   accordance   with   their   respective
                                  entitlements  to  interest. The  amount of  any deficiency
                                  will be added to the amount  of interest that the Class  A
                                  Certificates are entitled to receive on subsequent Distri-
                                  bution   Dates.   No   interest   will   accrue   on  such
                                  deficiencies.
                                  To the extent that  the amount available for  distribution
                                  on any Distribution Date, after the payment of all amounts
                                  due the Class A Certificates (other than any Class A-12 PO
                                  Component  Deferred Amount) has been made, is insufficient
                                  to permit distribution in full of accrued interest on  the
                                  Class  M Certificates  (net of  any Non-Supported Interest
                                  Shortfall, other shortfalls  and losses  allocable to  the
                                  Class  M Certificates  as described above),  the amount of
                                  any deficiency will  be added  to the  amount of  interest
                                  that  such Class M Certificates are entitled to receive on
                                  subsequent Distribution Dates. No interest will accrue  on
                                  such deficiencies.
                                  To  the extent that the  amount available for distribution
                                  on any Distribution Date, after the payment of all amounts
                                  due the Class A Certificates (other than any Class A-12 PO
                                  Component Deferred Amount), the  Class M Certificates  and
                                  each  Subclass  of  Class  B  Certificates  with  a  lower
                                  numerical designation has  been made,  is insufficient  to
                                  permit  distribution  in  full of  accrued  interest  on a
                                  Subclass of Class B Certificates (net of any Non-Supported
                                  Interest   Shortfall,   other   shortfalls   and    losses
</TABLE>
 
                                      S-20
<PAGE>
 
<TABLE>
<S>                               <C>
                                  allocable  to  such Subclass  of  Class B  Certificates as
                                  described above),  the amount  of any  deficiency will  be
                                  added  to  the amount  of interest  that such  Subclass of
                                  Class B Certificates is entitled to receive on  subsequent
                                  Distribution  Dates.  No  interest  will  accrue  on  such
                                  deficiencies.
                                  Interest  on  the  Class  A  Certificates,  the  Class   M
                                  Certificates   and  the  Class   B  Certificates  will  be
                                  calculated on the  basis of a  360-day year consisting  of
                                  twelve 30-day months.
                                  See  "Description of the Certificates -- Interest" in this
                                  Prospectus Supplement.
                                  PRINCIPAL  DISTRIBUTIONS.     The   aggregate  amount   of
                                  principal to which the holders of the Class A Certificates
                                  (other  than the  holders of  the Class  A-12 Certificates
                                  with respect to the Class A-12 PO Component) are  entitled
                                  each  month will equal  the sum for  each Mortgage Loan of
                                  the product of (a) the Non-PO Fraction applicable to  such
                                  Mortgage  Loan and  (b) the sum  of (i)  a percentage (the
                                  "Class A Percentage") of  scheduled payments of  principal
                                  on  each Mortgage Loan and (ii) a percentage (the "Class A
                                  Prepayment Percentage") of certain unscheduled payments of
                                  principal on  each Mortgage  Loan. The  "Non-PO  Fraction"
                                  with  respect  to any  Mortgage  Loan will  equal  the Net
                                  Mortgage Interest Rate for  such Mortgage Loan divided  by
                                  7.75%.  The  Class A  Percentage  will be  equal,  on each
                                  Distribution Date, to the percentage corresponding to  the
                                  fraction that represents the ratio of the then-outstanding
                                  principal  balance  of  the  Class  A  Certificates (after
                                  subtracting the component principal  balance of the  Class
                                  A-12  PO Component) to the  Pool Balance (Non-PO Portion).
                                  The Class A  Prepayment Percentage  will be  equal to  the
                                  percentage  described  in the  preceding sentence  plus an
                                  additional amount equal to  a percentage of the  principal
                                  otherwise  distributable  to the  holders of  the Subordi-
                                  nated Certificates. As a result, the percentage of certain
                                  unscheduled principal payments otherwise distributable  to
                                  the  holders  of  the  Subordinated  Certificates  that is
                                  instead distributable  to  the  holders  of  the  Class  A
                                  Certificates  (other than the Class A-12 Certificates with
                                  respect to the Class A-12  PO Component) will be equal  to
                                  100%  during the first  five years beginning  on the first
                                  Distribution  Date   and,  subject   to  meeting   certain
                                  conditions, will likely decline during the subsequent four
                                  years,  as described under the heading "Description of the
                                  Certificates  --  Principal  (Including  Prepayments)   --
                                  Calculation  of Amount  to be  Distributed to  the Class A
                                  Certificates" in  this  Prospectus Supplement,  until  the
                                  ninth  anniversary  of  the  first  Distribution  Date and
                                  thereafter  will  likely  be   equal  to  zero.  On   each
                                  Distribution Date, the Subordinated Certificates will col-
                                  lectively  be entitled  to receive the  percentages of the
                                  scheduled and certain unscheduled payments of principal on
                                  the portion of each Mortgage Loan representing the  Non-PO
                                  Fraction  of such  Mortgage Loan  equal, in  each case, to
                                  100% less  the  applicable  percentage  for  the  Class  A
                                  Certificates described above.
</TABLE>
 
                                      S-21
<PAGE>
 
<TABLE>
<S>                               <C>
                                  The  aggregate amount of principal to which holders of the
                                  Class A-12  Certificates  are  entitled  each  month  with
                                  respect  to the Class A-12 PO Component will equal the sum
                                  for each Discount Mortgage Loan of the product of (a)  the
                                  PO  Fraction for such Mortgage Loan and (b) the sum of (i)
                                  scheduled principal  payments on  such Mortgage  Loan  and
                                  (ii)  certain  unscheduled payments  of principal  on such
                                  Mortgage Loan.  See "Description  of the  Certificates  --
                                  Principal (Including Prepayments) -- Calculation of Amount
                                  to  be  Distributed to  the Class  A-12 PO  Component." In
                                  addition, the Class A-12 Certificates will be entitled  to
                                  receive  any  previously  unpaid amounts  of  principal to
                                  which   such   Certificates   were   entitled   on   prior
                                  Distribution  Dates as part of the Class A-12 PO Component
                                  Deferred Amount.  The "PO  Fraction" with  respect to  any
                                  Discount  Mortgage Loan will  equal the difference between
                                  1.0 and  the Non-PO  Fraction for  such Discount  Mortgage
                                  Loan.  The PO Fraction with  respect to each Mortgage Loan
                                  that is  not a  Discount Mortgage  Loan will  be equal  to
                                  zero.  See "Description  of the  Certificates -- Principal
                                  (Including Prepayments)" in this Prospectus Supplement.
                                  The holders of  the Class A-12  Certificates will also  be
                                  entitled  each month to an amount  equal to the Class A-12
                                  PO Component Deferred Amount. The Class A-12 PO  Component
                                  Deferred  Amount will be paid to holders of the Class A-12
                                  Certificates only from amounts otherwise distributable  as
                                  principal  to the  Subclasses of  Class B  Certificates in
                                  reverse numerical order  and then  from amounts  otherwise
                                  distributable as principal to the Class M Certificates. No
                                  interest  will  accrue  on  any  Class  A-12  PO Component
                                  Deferred Amount.
                                  Except  as   described   below   under   "--   Effect   of
                                  Subordination  Level on Principal  Distributions," on each
                                  Distribution Date, the  Class M, Class  B-1 and Class  B-2
                                  Certificates  will be  entitled to a  portion of scheduled
                                  payments and certain unscheduled payments of principal  on
                                  the   Mortgage   Loans  allocable   to   the  Subordinated
                                  Certificates  that  represents  the  ratio  of  the  then-
                                  outstanding principal balance of the Class M, Class B-1 or
                                  Class  B-2  Certificates,  as  the  case  may  be,  to the
                                  then-outstanding principal  balance  of  the  Subordinated
                                  Certificates.
                                  The  amount  that  is available  for  distribution  to the
                                  holders of the  Class A Certificates  on any  Distribution
                                  Date  as a distribution of principal (other than any Class
                                  A-12 PO Component Deferred Amount)  is the sum of (i)  the
                                  amount  remaining after  deducting the  amount of interest
                                  distributable on the Class  A Certificates (including  the
                                  amount  added to  the principal balance  and the component
                                  principal balance of the  Class A-11 Certificates and  the
                                  Class  A-12 TAC Accrual  Component, respectively) from the
                                  total amount collected that is available to be distributed
                                  to holders  of  the  Series 1996-4  Certificates  on  such
                                  Distribution Date and (ii) the amount of interest, if any,
                                  added to the principal balance and the component principal
                                  balance  of the Class A-11 Certificates and the Class A-12
                                  TAC Accrual Component, respectively, with respect to  such
                                  Distribution
</TABLE>
 
                                      S-22
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Date.  Accordingly, even  though the  Class A Certificates
                                  may not receive  all accrued  interest to  which they  are
                                  entitled  on  a  given  Distribution  Date,  the Accretion
                                  Directed Certificates, the Class A-11 Certificates and the
                                  Class A-12 TAC Accrual Component may receive distributions
                                  of principal as a result of the application of clause (ii)
                                  above. Principal will be distributed to the holders of the
                                  Class  A  Certificates  in  accordance  with  the  payment
                                  priorities described under the heading "Description of the
                                  Certificates   --  Principal  (Including  Prepayments)  --
                                  Allocation of Amount to be Distributed."
                                  The amount  that  is  available for  distribution  to  the
                                  holders  of the  Class M Certificates  on any Distribution
                                  Date  as  a  distribution  of  principal  is  the   amount
                                  remaining  after all interest  and principal distributions
                                  due on the Class A Certificates (including any Class  A-12
                                  PO  Component  Deferred Amount)  and  interest due  on the
                                  Class M  Certificates have  been deducted  from the  total
                                  amount  collected that  is available to  be distributed to
                                  holders of the Series 1996-4 Certificates.
                                  The amount  that  is  available for  distribution  to  the
                                  holders  of  a Subclass  of  Class B  Certificates  on any
                                  Distribution Date as  a distribution of  principal is  the
                                  amount   remaining  after   all  interest   and  principal
                                  distributions due on the  Class A Certificates  (including
                                  any Class A-12 PO Component Deferred Amount), all interest
                                  and  principal distributions  on the  Class M Certificates
                                  and the  Subclasses of  Class  B Certificates  with  lower
                                  numerical  designations and interest  due on such Subclass
                                  of Class B Certificates have been deducted from the  total
                                  amount  collected that  is available to  be distributed to
                                  holders of the Series 1996-4 Certificates.
                                  EFFECT OF SUBORDINATION LEVEL ON PRINCIPAL  DISTRIBUTIONS.
                                    In  order to  preserve the availability  of the original
                                  subordination level as  protection against  losses on  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, some or  all of the Subclasses  of
                                  Class  B  Certificates,  as described  below,  may  not be
                                  entitled  to   distributions  of   principal  on   certain
                                  Distribution  Dates  and  the principal  balances  of such
                                  Subclasses  will  not  be   considered  for  purposes   of
                                  allocation    of   principal    among   the   Subordinated
                                  Certificates.
                                  In the  case  of  the  Class M  Certificates,  if  on  any
                                  Distribution  Date the percentage obtained by dividing the
                                  outstanding principal balance of the Class B  Certificates
                                  by  the sum of  the outstanding principal  balances of the
                                  Class  A  Certificates  (other  than  the  Class  A-12  PO
                                  Component),  the  Class  M Certificates  and  the  Class B
                                  Certificates is  less than  such percentage  was upon  the
                                  initial  issuance of the  Series 1996-4 Certificates, then
                                  the  Class  B  Certificates   will  not  be  entitled   to
                                  distributions  of principal on  such Distribution Date and
                                  the  Class  M  Certificates   will  be  entitled  to   all
                                  distributions  of principal allocable  to the Subordinated
                                  Certificates for such Distribution Date.
</TABLE>
 
                                      S-23
<PAGE>
 
<TABLE>
<S>                               <C>
                                  In the case  of the  Class B-1,  Class B-2,  Class B-3  or
                                  Class  B-4 Certificates,  if on any  Distribution Date the
                                  percentage  obtained  by  dividing  the   then-outstanding
                                  principal   balances   of  the   Subclasses  of   Class  B
                                  Certificates with higher numerical designations by the sum
                                  of the then-outstanding principal balances of the Class  A
                                  Certificates (other than the Class A-12 PO Component), the
                                  Class  M Certificates and the Class B Certificates is less
                                  than such percentage at the  time of the initial  issuance
                                  of the Series 1996-4 Certificates, then such Subclasses of
                                  Class  B Certificates  with higher  numerical designations
                                  will not be entitled to distributions of principal and the
                                  principal balances of  such Subclasses will  not be  taken
                                  into  account for purposes of  calculating the portions of
                                  scheduled and unscheduled principal payments allocable  to
                                  the  Class M Certificates and to the Subclasses of Class B
                                  Certificates with lower numerical designations.
                                  In either  of  the  cases described  above,  the  Class  M
                                  Certificates  and those Subclasses of Class B Certificates
                                  with lower numerical designations  will receive a  greater
                                  portion of scheduled and unscheduled payments of principal
                                  on  the  Mortgage  Loans  allocable  to  the  Subordinated
                                  Certificates than  the  Class  M  Certificates  and  those
                                  Subclasses  of Class  B Certificates  with lower numerical
                                  designations would  have received  had all  Subclasses  of
                                  Class  B Certificates  been entitled  to their  portion of
                                  such  principal   payments.   See  "Description   of   the
                                  Certificates   --  Principal  (Including  Prepayments)  --
                                  Calculation of Amount to be Distributed to the Class M and
                                  Class B Certificates" in this Prospectus Supplement.
Credit Enhancement..............  DESCRIPTION OF  "SHIFTING-INTEREST"  SUBORDINATION.    The
                                  rights  of  the holders  of  the Class  M  Certificates to
                                  receive distributions will be  subordinated to the  rights
                                  of  the  holders of  the Class  A Certificates  to receive
                                  distributions, to the extent described herein. The  rights
                                  of  the holders of  a Subclass of  Class B Certificates to
                                  receive distributions will be  subordinated to the  rights
                                  of  the holders of  the Class A  Certificates, the Class M
                                  Certificates and the  Subclasses of  Class B  Certificates
                                  with    lower    numerical    designations    to   receive
                                  distributions,  to  the  extent  described  herein.   This
                                  subordination  provides a certain  amount of protection to
                                  the holders of the Class A Certificates (to the extent  of
                                  the  subordination  of the  Class M  and Class  B Certifi-
                                  cates), the Class  M Certificates  (to the  extent of  the
                                  subordination   of  the  Class  B  Certificates)  and  the
                                  Subclasses of Class B  Certificates (other than the  Class
                                  B-5  Certificates) (to the extent  of the subordination of
                                  the  Subclasses  of  Class  B  Certificates  with   higher
                                  numerical  designations) against delays  in the receipt of
                                  scheduled payments of interest  and principal and  against
                                  losses  associated with the liquidation of defaulted Mort-
                                  gage  Loans  and   certain  losses   resulting  from   the
                                  bankruptcy of a mortgagor.
                                  In  general, the  protection afforded  the holders  of the
                                  Class A Certificates by  means of this subordination  will
                                  be  effected in two ways: (i) by the preferential right of
                                  the holders of the Class A Certificates to receive,  prior
                                  to any distribution being
</TABLE>
 
                                      S-24
<PAGE>
 
<TABLE>
<S>                               <C>
                                  made  on any Distribution  Date in respect  of the Class M
                                  and Class  B Certificates,  the  amounts of  interest  and
                                  principal due the holders of the Class A Certificates and,
                                  if  necessary,  by the  right of  such holders  to receive
                                  future distributions  on  the Mortgage  Loans  that  would
                                  otherwise  have been allocated to the holders of the Class
                                  M and Class B Certificates  and (ii) by the allocation  to
                                  the   Class  M  and  Class  B  Certificates,  until  their
                                  respective principal balances have  been reduced to  zero,
                                  of  certain  losses  resulting  from  the  liquidation  of
                                  defaulted Mortgage Loans or  the bankruptcy of  mortgagors
                                  prior  to the  allocation of  such losses  to the  Class A
                                  Certificates. See  "Description  of  the  Certificates  --
                                  Distributions" in this Prospectus Supplement.
                                  In  general, the  protection afforded  the holders  of the
                                  Class M Certificates by  means of this subordination  will
                                  also  be  effected in  two ways:  (i) by  the preferential
                                  right of  the  holders  of the  Class  M  Certificates  to
                                  receive,  prior  to  any distribution  being  made  on any
                                  Distribution Date in respect of the Class B  Certificates,
                                  the  amounts of interest and  principal due the holders of
                                  the Class M Certificates on  such date and, if  necessary,
                                  by   the  right   of  such   holders  to   receive  future
                                  distributions on the Mortgage  Loans that would  otherwise
                                  have  been  allocated  to  the  holders  of  the  Class  B
                                  Certificates and (ii)  by the  allocation to  the Class  B
                                  Certificates,  until  their  principal  balance  has  been
                                  reduced to  zero, of  certain  losses resulting  from  the
                                  liquidation  of defaulted Mortgage Loans or the bankruptcy
                                  of mortgagors prior  to the allocation  of such losses  to
                                  the   Class  M  Certificates.   See  "Description  of  the
                                  Certificates  --   Distributions"   in   this   Prospectus
                                  Supplement.
                                  In  general,  the  protection afforded  the  holders  of a
                                  Subclass  of  Class  B  Certificates  by  means  of   this
                                  subordination  will also be  effected in two  ways: (i) by
                                  the preferential right of the holders of such Subclass  to
                                  receive,  prior  to  any distribution  being  made  on any
                                  Distribution Date in respect of the Subclasses of Class  B
                                  Certificates   with  higher  numerical  designations,  the
                                  amounts of interest and principal due the holders of  such
                                  Subclass  on such date and, if  necessary, by the right of
                                  such  holders  to  receive  future  distributions  on  the
                                  Mortgage Loans that would otherwise have been allocated to
                                  the holders of the Subclasses of Class B Certificates with
                                  higher  numerical designations and  (ii) by the allocation
                                  to the  Subclasses of  Class  B Certificates  with  higher
                                  numerical  designations,  until  their  principal balances
                                  have been  reduced to  zero, of  certain losses  resulting
                                  from  the liquidation  of defaulted Mortgage  Loans or the
                                  bankruptcy of mortgagors prior  to the allocation of  such
                                  losses   to  such   Subclass.  See   "Description  of  the
                                  Certificates  --   Distributions"   in   this   Prospectus
                                  Supplement.
                                  In  addition, in order to increase the period during which
                                  the  principal  balances  of  the  Class  M  and  Class  B
                                  Certificates remain available as credit enhancement to the
                                  Class   A  Certificates,  a   disproportionate  amount  of
                                  prepayments  and  certain   unscheduled  recoveries   with
                                  respect  to the  Mortgage Loans  will be  allocated to the
                                  Class A Certificates (other than the
</TABLE>
 
                                      S-25
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Class A-12 Certificates with respect to the Class A-12  PO
                                  Component). This allocation has the effect of accelerating
                                  the  amortization of the Class  A Certificates (other than
                                  the Class A-12 Certificates with respect to the Class A-12
                                  PO Component) while, in the  absence of losses in  respect
                                  of  the liquidation of defaulted  Mortgage Loans or losses
                                  resulting from  the bankruptcy  of mortgagors,  increasing
                                  the  respective  percentage  interests  in  the  principal
                                  balance of the Mortgage Loans evidenced by the Class M and
                                  Class B  Certificates.  As  a  result  of  the  method  of
                                  calculating  the  Class  A-5 Priority  Amount  (as defined
                                  herein) and the priorities for the allocation of the Class
                                  A Non-PO  Principal  Amount  (as defined  herein),  it  is
                                  expected  that,  absent  an  exceptionally  high  rate  of
                                  principal prepayments on the Mortgage Loans, no  principal
                                  prepayments   will   be   allocated  to   the   Class  A-5
                                  Certificates during  the first  five years  following  the
                                  issuance of the Series 1996-4 Certificates and that, while
                                  the  percentage of principal  prepayments allocated to the
                                  Class A-5 Certificates  during the  four years  thereafter
                                  will  gradually increase, such percentage, until the tenth
                                  year  following  the   issuance  of   the  Series   1996-4
                                  Certificates,  will be  disproportionately lower  than the
                                  percentage of such principal prepayments allocated to  the
                                  other  Class  A Certificates  (other  than the  Class A-12
                                  Certificates with respect to the Class A-12 PO Component).
                                  See  "Description   of  the   Certificates  --   Principal
                                  (Including  Prepayments)  --  Allocation of  Amount  to be
                                  Distributed" and "Prepayment and Yield Considerations"  in
                                  this Prospectus Supplement.
                                  EXTENT  OF  LOSS COVERAGE.    Realized losses  on Mortgage
                                  Loans, other  than losses  that  are (i)  attributable  to
                                  "special  hazards"  not insured  against under  a standard
                                  hazard  insurance  policy,  (ii)  incurred  on   defaulted
                                  Mortgage  Loans  as  to  which  there  was  fraud  in  the
                                  origination of such Mortgage  Loans or (iii)  attributable
                                  to  certain  actions which  may be  taken by  a bankruptcy
                                  court in  connection with  a  Mortgage Loan,  including  a
                                  reduction  by a bankruptcy court  of the principal balance
                                  of or the interest rate on a Mortgage Loan or an extension
                                  of its  maturity, will  not be  allocated to  the Class  A
                                  Certificates   until  the  date  on  which  the  aggregate
                                  principal balance of the Class M and Class B  Certificates
                                  (which  aggregate  balance  is  expected  initially  to be
                                  approximately $22,991,621) has been reduced to zero;  will
                                  not  be allocated  to the  Class M  Certificates until the
                                  date on which the aggregate principal balance of the Class
                                  B  Certificates  (which  aggregate  balance  is   expected
                                  initially   to  be  approximately  $13,411,621)  has  been
                                  reduced to zero; and  will not be  allocated to the  Class
                                  B-1  or Class B-2 Certificates until the date on which the
                                  aggregate principal balance of  the Subclasses of Class  B
                                  Certificates  with higher numerical  designations has been
                                  reduced to  zero  (which  aggregate  balance  is  expected
                                  initially  to be approximately  $8,621,621 with respect to
                                  the Class  B-1 Certificates  and approximately  $4,790,621
                                  with
</TABLE>
 
                                      S-26
<PAGE>
 
<TABLE>
<S>                               <C>
                                  respect  to the Class B-2  Certificates). Such losses will
                                  be  allocated  first  among  the  Subclasses  of  Class  B
                                  Certificates,  in reverse numerical order (that is, to the
                                  Class B-5, Class B-4, Class  B-3, Class B-2 and Class  B-1
                                  Certificates, respectively).
                                  With  respect to  any Distribution Date  subsequent to the
                                  first Distribution Date,  the availability  of the  credit
                                  enhancement  provided by the Class  M Certificates and the
                                  Subclasses of Class B Certificates will be affected by the
                                  prior reduction of  the principal balance  of the Class  M
                                  Certificates  and such Subclasses of Class B Certificates.
                                  Reduction  of  the  principal  balance  of  the  Class   M
                                  Certificates and any Subclass of Class B Certificates will
                                  result  from (i) the prior allocation of losses due to the
                                  liquidation of defaulted Mortgage Loans, including  losses
                                  due  to  special  hazards  and  fraud  losses  up  to  the
                                  respective  limits  referred  to  below,  (ii)  the  prior
                                  allocation  of bankruptcy losses up  to the limit referred
                                  to  below  and  (iii)  the  prior  receipt  of   principal
                                  distributions by the holders of such Certificates.
                                  As   of  the  date  of   issuance  of  the  Series  1996-4
                                  Certificates, the amount of losses attributable to special
                                  hazards, fraud and bankruptcy that will be absorbed solely
                                  by the holders of the  Subclasses of Class B  Certificates
                                  in  reverse numerical order and then solely by the holders
                                  of the Class M  Certificates will be approximately  1.02%,
                                  2.00%   and  0.04%,  respectively,  of  the  Cut-Off  Date
                                  Aggregate  Principal   Balance  of   the  Mortgage   Loans
                                  (approximately   $3,898,940,   $7,663,629   and  $150,000,
                                  respectively). If losses due to special hazards, fraud  or
                                  bankruptcy  exceed  any  of  such  amounts  prior  to  the
                                  principal balances of the Class M and Class B Certificates
                                  being reduced to  zero, (a) the  principal portion of  any
                                  such excess losses with respect to the Mortgage Loans will
                                  generally   be  shared  pro  rata   by  (i)  the  Class  A
                                  Certificates (other than the Class A-12 Certificates  with
                                  respect  to the Class  A-12 PO Component)  and the Class M
                                  and Class  B  Certificates and  (ii)  to the  extent  such
                                  losses  arise with respect to Discount Mortgage Loans, the
                                  Class A-12 PO Component, in  each case according to  their
                                  respective  interests in  such Mortgage Loans  and (b) the
                                  interest portion of  any such losses  with respect to  the
                                  Mortgage  Loans will generally  be shared pro  rata by the
                                  Class A, Class M and  Class B Certificates based on  their
                                  respective  interest accrual  amounts. Under  certain cir-
                                  cumstances, the limits set forth  above may be reduced  as
                                  described   under  "Description  of  the  Certificates  --
                                  Subordination of  Class  M  and Class  B  Certificates  --
                                  Allocation of Losses" in this Prospectus Supplement.
                                  After  the principal balances  of the Class  M and Class B
                                  Certificates have  been  reduced to  zero,  the  principal
                                  portion of all losses (other than the portion attributable
                                  to   the  Class  A-12  PO  Component  of  the  Class  A-12
                                  Certificates, if any)  will be  allocated to  the Class  A
                                  Certificates  (other than the Class A-12 Certificates with
                                  respect to the  Class A-12  PO Component).  To the  extent
                                  such losses arise with respect to Discount Mortgage Loans,
                                  principal losses will be shared among the Class A Certifi-
                                  cates,  according  to their  respective interests  in such
                                  Mortgage
</TABLE>
 
                                      S-27
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Loans. The principal  portion of any  losses borne by  the
                                  Class A Certificates (other than losses borne by the Class
                                  A-12  Certificates  with  respect  to  the  Class  A-12 PO
                                  Component) will be  shared pro rata  by the Subclasses  of
                                  Class   A   Certificates  (other   than  the   Class  A-12
                                  Certificates) and  the Class  A-12 TAC  Accrual  Component
                                  based  on  their  then-outstanding  principal  balances or
                                  component principal balance or, in  the case of the  Class
                                  A-11  Certificates and  the Class A-12  TAC Accrual Compo-
                                  nent, the  initial principal  balance  of the  Class  A-11
                                  Certificates  and the initial  component principal balance
                                  of the Class A-12 TAC  Accrual Component, as the case  may
                                  be, if lower. The interest portion of such losses borne by
                                  the  Class A Certificates  will be shared  pro rata by the
                                  Subclasses of  Class A  Certificates based  upon  interest
                                  accrued. See "Description of the Certificates -- Interest"
                                  and  "-- Subordination of Class M and Class B Certificates
                                  -- Allocation of Losses" in this Prospectus Supplement.
                                  THE YIELD TO MATURITY ON THE CLASS M CERTIFICATES WILL  BE
                                  MORE  SENSITIVE  TO  LOSSES  DUE  TO  LIQUIDATIONS  OF THE
                                  MORTGAGE LOANS (AND THE TIMING  THEREOF) THAN THE CLASS  A
                                  CERTIFICATES,  IN THE  EVENT THAT  THE AGGREGATE PRINCIPAL
                                  BALANCE OF THE  CLASS B CERTIFICATES  HAS BEEN REDUCED  TO
                                  ZERO.
                                  THE  YIELD TO MATURITY ON EACH SUBCLASS OF OFFERED CLASS B
                                  CERTIFICATES WILL  BE  MORE  SENSITIVE TO  LOSSES  DUE  TO
                                  LIQUIDATIONS   OF  THE  MORTGAGE  LOANS  (AND  THE  TIMING
                                  THEREOF) THAN THE  CLASS A  CERTIFICATES AND  THE CLASS  M
                                  CERTIFICATES   AND,  IN   THE  CASE   OF  THE   CLASS  B-2
                                  CERTIFICATES, THE  CLASS B-1  CERTIFICATES, IN  THE  EVENT
                                  THAT  THE PRINCIPAL BALANCES OF  THE SUBCLASSES OF CLASS B
                                  CERTIFICATES WITH HIGHER NUMERICAL DESIGNATIONS HAVE  BEEN
                                  REDUCED TO ZERO.
                                  See  "Description of the  Certificates -- Subordination of
                                  Class M  and  Class  B Certificates"  in  this  Prospectus
                                  Supplement.
Effects of Prepayments on In-
 vestment Expectations..........  The actual rate of prepayment of principal on the Mortgage
                                  Loans  cannot be predicted.  The investment performance of
                                  the Offered Certificates may vary materially and adversely
                                  from the  investment  expectations  of  investors  due  to
                                  prepayments  on the  Mortgage Loans being  higher or lower
                                  than anticipated by  investors. In addition,  the Class  A
                                  Certificates  in the  aggregate will be  more sensitive to
                                  prepayments on the  Mortgage Loans  than the  Subordinated
                                  Certificates  due  to the  disproportionate  allocation of
                                  such prepayments to investors in the Class A  Certificates
                                  (other  than the  Class A-12 Certificates  with respect to
                                  the Class A-12  PO Component) then  entitled to  principal
                                  distributions during the nine years beginning on the first
                                  Distribution  Date. The actual  yield to the  holder of an
                                  Offered  Certificate  may  not  be  equal  to  the   yield
                                  anticipated at the time of purchase of the Certificate or,
                                  notwithstanding  that  the actual  yield  is equal  to the
                                  yield anticipated  at  that  time,  the  total  return  on
                                  investment  expected  by  the  investor  or  the  expected
                                  weighted average  life  of  the  Certificate  may  not  be
                                  realized. These effects
</TABLE>
 
                                      S-28
<PAGE>
 
<TABLE>
<S>                               <C>
                                  are  summarized below. IN DECIDING WHETHER TO PURCHASE ANY
                                  OFFERED  CERTIFICATES,   AN   INVESTOR  SHOULD   MAKE   AN
                                  INDEPENDENT  DECISION  AS  TO  THE  APPROPRIATE PREPAYMENT
                                  ASSUMPTIONS TO BE USED.
                                  YIELD.  If an investor purchases an Offered Certificate at
                                  an amount equal to its unpaid principal balance (that  is,
                                  at  "par"), the effective yield to that investor (assuming
                                  that there  are no  interest shortfalls  and assuming  the
                                  full  return  of the  investor's invested  principal) will
                                  approximate the Pass-Through Rate on that Certificate.  If
                                  an  investor pays less  or more than  the unpaid principal
                                  balance of  an  Offered  Certificate (that  is,  buys  the
                                  Certificate  at a "discount"  or "premium," respectively),
                                  then, based on the assumptions set forth in the  preceding
                                  sentence,  the  effective yield  to  the investor  will be
                                  higher or lower,  respectively, than  the stated  interest
                                  rate  on the Certificate, because such discount or premium
                                  will be amortized  over the life  of the Certificate.  Any
                                  deviation  in  the  actual  rate  of  prepayments  on  the
                                  Mortgage Loans from the rate assumed by the investor  will
                                  affect  the  period of  time over  which,  or the  rate at
                                  which, the  discount or  premium  will be  amortized  and,
                                  consequently, will change the investor's actual yield from
                                  that anticipated. The timing of receipt of prepayments may
                                  also  affect the investor's actual yield. AN INVESTOR THAT
                                  PURCHASES ANY OFFERED  CERTIFICATES AT  A DISCOUNT  SHOULD
                                  CONSIDER  THE RISK THAT A  SLOWER THAN ANTICIPATED RATE OF
                                  PRINCIPAL PAYMENTS ON THE MORTGAGE LOANS WILL RESULT IN AN
                                  ACTUAL YIELD THAT IS  LOWER THAN SUCH INVESTOR'S  EXPECTED
                                  YIELD. AN INVESTOR THAT PURCHASES ANY OFFERED CERTIFICATES
                                  AT  A PREMIUM SHOULD CONSIDER THE  RISK THAT A FASTER THAN
                                  ANTICIPATED RATE  OF PRINCIPAL  PAYMENTS ON  THE  MORTGAGE
                                  LOANS  WILL RESULT IN  AN ACTUAL YIELD  THAT IS LOWER THAN
                                  SUCH INVESTOR'S  EXPECTED YIELD  AND SHOULD  CONSIDER  THE
                                  RISK  THAT  A  RAPID  RATE OF  PRINCIPAL  PAYMENTS  ON THE
                                  MORTGAGE  LOANS  COULD  RESULT  IN  THE  FAILURE  OF  SUCH
                                  INVESTOR TO FULLY RECOVER ITS INITIAL INVESTMENT.
                                  REINVESTMENT  RISK.    As  stated  above,  if  an  Offered
                                  Certificate is purchased at par, fluctuations in the  rate
                                  of  distributions of  principal will  generally not affect
                                  the yield to  maturity of that  Certificate. However,  the
                                  total  return on  any investor's  investment, including an
                                  investor who  purchases at  par, will  be reduced  to  the
                                  extent   that  principal  distributions  received  on  its
                                  Certificate cannot be reinvested at a rate as high as  the
                                  stated  interest rate of the Certificate. Investors in the
                                  Offered Certificates should consider  the risk that  rapid
                                  rates  of prepayments  on the Mortgage  Loans may coincide
                                  with periods  of  low prevailing  market  interest  rates.
                                  During  periods of  low prevailing  market interest rates,
                                  mortgagors may be expected to prepay or refinance Mortgage
                                  Loans that carry interest rates significantly higher  than
                                  then-current    interest   rates   for   mortgage   loans.
                                  Consequently,  the  amount   of  principal   distributions
                                  available  to  an investor  for  reinvestment at  such low
                                  prevailing  interest  rates   may  be  relatively   large.
                                  Conversely,  slow  rates  of prepayments  on  the Mortgage
                                  Loans may coincide with periods of high prevailing  market
                                  interest  rates. During  such periods,  it is  less likely
                                  that mortgagors will elect to prepay
</TABLE>
 
                                      S-29
<PAGE>
 
<TABLE>
<S>                               <C>
                                  or refinance Mortgage Loans and, therefore, the amount  of
                                  principal  distributions  available  to  an  investor  for
                                  reinvestment at such high prevailing interest rates may be
                                  relatively small.
                                  WEIGHTED AVERAGE LIFE VOLATILITY.   One indication of  the
                                  impact  of varying prepayment speeds  on a security is the
                                  change in its weighted average life. The "weighted average
                                  life" of an Offered Certificate  is the average amount  of
                                  time  that will elapse between the date of issuance of the
                                  Certificate and the date on which each dollar in reduction
                                  of the principal balance of the Certificate is distributed
                                  to the investor. Low rates of prepayment may result in the
                                  extension of the weighted  average life of a  Certificate;
                                  high  rates, in  the shortening  of such  weighted average
                                  life.
                                  In general, if the weighted average life of a  Certificate
                                  purchased   at  par  is  extended  beyond  that  initially
                                  anticipated,  such  Certificate's  market  value  may   be
                                  adversely  affected even  though the yield  to maturity on
                                  the Certificate is unaffected.
                                  THE WEIGHTED AVERAGE LIVES  OF THE COMPANION  CERTIFICATES
                                  WILL BE HIGHLY SENSITIVE TO THE RATE OF PREPAYMENTS ON THE
                                  MORTGAGE LOANS AT RATES ABOVE THE CONSTANT PREPAYMENT RATE
                                  AT  WHICH THE  PRINCIPAL BALANCES  AND COMPONENT PRINCIPAL
                                  BALANCE OF THE  TAC CERTIFICATES  AND THE  CLASS A-12  TAC
                                  ACCRUAL  COMPONENT  WILL  BE  REDUCED  TO  THEIR  TARGETED
                                  PERCENTAGES BECAUSE PAYMENTS OF PRINCIPAL ALLOCATED TO THE
                                  CLASS  A  CERTIFICATES  (OTHER  THAN  THE  CLASS  A-12  PO
                                  COMPONENT) IN EXCESS OF SUCH CONSTANT PREPAYMENT RATE WILL
                                  BE  PAID TO  HOLDERS OF SUCH  COMPANION CERTIFICATES WHILE
                                  SUCH CERTIFICATES REMAIN OUTSTANDING  PRIOR TO BEING  PAID
                                  TO  THE HOLDERS OF THE TAC CERTIFICATES AND THE CLASS A-12
                                  CERTIFICATES WITH RESPECT  TO THE CLASS  A-12 TAC  ACCRUAL
                                  COMPONENT.
                                  See "Prepayment and Yield Considerations" and "Description
                                  of the Certificates -- Principal (Including
                                  Prepayments)  -- Principal Payment  Characteristics of the
                                  TAC Certificates, the Class A-12 TAC Accural Component and
                                  the Companion Certificates" in this Prospectus Supplement.
                                  The weighted average  lives of  the Offered  Certificates,
                                  under  various prepayment scenarios,  are displayed in the
                                  tables appearing under the  heading "Prepayment and  Yield
                                  Considerations" in this Prospectus Supplement.
Federal Income Tax Status.......  For  federal income  tax purposes,  the Trust  Estate will
                                  consist of two  real estate  mortgage investment  conduits
                                  (the   "Upper-Tier  REMIC"  and  the  "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-13, Class A-14, Class
                                  A-15 and  Class  A-16  Certificates, the  Class  A-12  TAC
                                  Accrual  Component,  the Class  A-12  IO A  Component, the
                                  Class A-12 IO B Component, the Class A-12 IO C  Component,
                                  the  Class A-12 PO Component, the Class M Certificates and
                                  the Class B-1, Class B-2,  Class B-3, Class B-4 and  Class
                                  B-5  Certificates will  constitute "regular  interests" in
                                  the
</TABLE>
 
                                      S-30
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Upper-Tier REMIC and the Class A-R and Class A-LR Certifi-
                                  cates will  constitute  the  "residual  interest"  in  the
                                  Upper-Tier REMIC and Lower-Tier REMIC, respectively.
                                  The  Regular  Certificates (as  defined  herein) generally
                                  will be treated as  newly originated debt instruments  for
                                  federal  income  tax  purposes. Beneficial  owners  of the
                                  Regular Certificates  will be  required to  report  income
                                  thereon   in  accordance   with  the   accrual  method  of
                                  accounting. It  is anticipated  that  the Class  A-11  and
                                  Class  B-2 Certificates will be issued with original issue
                                  discount in an amount equal to the excess of their initial
                                  principal balances  (plus  two  days of  interest  at  the
                                  pass-through  rates thereon)  over their  respective issue
                                  prices  (including   accrued   interest).   It   is   also
                                  anticipated  that  the Class  A-1,  Class A-2,  Class A-3,
                                  Class A-4, Class  A-6, Class  A-7, Class  A-8, Class  A-9,
                                  Class A-10, Class A-14, Class A-15, Class A-16 and Class M
                                  Certificates  will  be issued  at a  premium and  that the
                                  Class A-5, Class A-13 and  Class B-1 Certificates will  be
                                  issued with DE MINIMIS original issue discount for federal
                                  income  tax purposes.  It is further  anticipated that the
                                  Class  A-12,   Class  B-3,   Class  B-4   and  Class   B-5
                                  Certificates, which are not offered hereby, will be issued
                                  with  original  issue  discount  for  federal  income  tax
                                  purposes.
                                  Holders of the Class A-R and Class A-LR Certificates  will
                                  be  required to include the taxable  income or loss of the
                                  Upper-Tier REMIC  and Lower-Tier  REMIC, respectively,  in
                                  determining   their   federal   taxable   income.   It  is
                                  anticipated that  all  or  a substantial  portion  of  the
                                  taxable  income  of  the Upper-Tier  REMIC  and Lower-Tier
                                  REMIC  includible  by  the   Class  A-R  and  Class   A-LR
                                  Certificateholders  will be treated  as "excess inclusion"
                                  income subject to special  limitations for federal  income
                                  tax  purposes. AS A RESULT, THE EFFECTIVE AFTER-TAX RETURN
                                  OF THE  CLASS  A-R  AND CLASS  A-LR  CERTIFICATES  MAY  BE
                                  SIGNIFICANTLY  LOWER THAN WOULD  BE THE CASE  IF THE CLASS
                                  A-R  AND  CLASS  A-LR  CERTIFICATES  WERE  TAXED  AS  DEBT
                                  INSTRUMENTS,  OR  MAY  BE  NEGATIVE.  FURTHER, SIGNIFICANT
                                  RESTRICTIONS APPLY TO  THE TRANSFER OF  THE CLASS A-R  AND
                                  CLASS  A-LR  CERTIFICATES. THE  CLASS  A-R AND  CLASS A-LR
                                  CERTIFICATES  WILL  BE  CONSIDERED  "NONECONOMIC  RESIDUAL
                                  INTERESTS,"  CERTAIN TRANSFERS OF WHICH MAY BE DISREGARDED
                                  FOR FEDERAL INCOME TAX PURPOSES.
                                  See "Description of  the Certificates  -- Restrictions  on
                                  Transfer of the Class A-R, Class A-LR, Class M and Offered
                                  Class    B   Certificates"   and   "Federal   Income   Tax
                                  Considerations" in this Prospectus Supplement and "Certain
                                  Federal Income  Tax  Consequences --  Federal  Income  Tax
                                  Consequences for REMIC Certificates" in the Prospectus.
ERISA Considerations............  A  fiduciary of any  employee benefit plan  subject to 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 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"), should carefully review  with its legal  advisors
                                  whether  the purchase  or holding  of Offered Certificates
</TABLE>
 
                                      S-31
<PAGE>
 
<TABLE>
<S>                               <C>
                                  could  give  rise  to  a  transaction  prohibited  or  not
                                  otherwise  permissible  under ERISA,  the Code  or Similar
                                  Law. BECAUSE THE CLASS M AND OFFERED CLASS B  CERTIFICATES
                                  ARE  SUBORDINATED TO THE CLASS A CERTIFICATES, THE CLASS M
                                  AND OFFERED CLASS  B CERTIFICATES MAY  NOT BE  TRANSFERRED
                                  UNLESS  THE TRANSFEREE HAS  DELIVERED (I) A REPRESENTATION
                                  LETTER TO THE TRUSTEE AND  SELLER 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
                                  HEREIN, THAT  THE SOURCE  OF FUNDS  USED TO  PURCHASE  THE
                                  CLASS  M OR OFFERED CLASS  B CERTIFICATES IS AN "INSURANCE
                                  COMPANY GENERAL ACCOUNT" OR (II) AN OPINION OF COUNSEL  AS
                                  DESCRIBED  UNDER "ERISA CONSIDERATIONS" IN THIS PROSPECTUS
                                  SUPPLEMENT RELATING TO THE OFFERING OF SUCH  CERTIFICATES.
                                  THE  CLASS  A-R  AND  CLASS A-LR  CERTIFICATE  MAY  NOT BE
                                  PURCHASED  BY  OR  TRANSFERRED  TO  A  PLAN.  See   "ERISA
                                  Considerations"  in this Prospectus  Supplement and in the
                                  Prospectus.
Legal Investment................  The Class  A  and  Class M  Certificates  will  constitute
                                  "mortgage   related  securities"   for  purposes   of  the
                                  Secondary Mortgage  Market Enhancement  Act of  1984  (the
                                  "Enhancement Act") so long as they are rated in one of the
                                  two  highest rating categories by  at least one nationally
                                  recognized statistical rating  organization. As such,  the
                                  Class A and Class M Certificates are legal investments for
                                  certain  entities to  the extent provided  in the Enhance-
                                  ment Act. However, there  are regulatory requirements  and
                                  considerations    applicable   to    regulated   financial
                                  institutions and  restrictions  on  the  ability  of  such
                                  institutions  to invest in certain types of mortgage rated
                                  securities. The Class B-1 and Class B-2 Certificates  will
                                  not  constitute  "mortgage related  securities"  under the
                                  Enhancement Act. The  appropriate characterization of  the
                                  Class  B-1 and Class B-2  Certificates under various legal
                                  investment restrictions, and thus the ability of investors
                                  subject to these  restrictions to purchase  the Class  B-1
                                  and  Class B-2 Certificates, may be subject to significant
                                  interpretive uncertainties. Prospective purchasers of  the
                                  Offered  Certificates should consult  their own legal, tax
                                  and accounting advisors in determining the suitability  of
                                  and  consequences to  them of the  purchase, ownership and
                                  disposition  of  the  Offered  Certificates.  See   "Legal
                                  Investment" in this Prospectus Supplement.
</TABLE>
 
                                      S-32
<PAGE>
                                  RISK FACTORS
 
GENERAL
 
    The  rate  of distributions  in reduction  of the  principal balance  of any
Subclass or Class of Offered Certificates, the aggregate amount of distributions
of principal and interest on any  Subclass or Class of Offered Certificates  and
the  yield to maturity of any Subclass  or Class of Offered Certificates will be
directly related to the rate of payments  of principal on the Mortgage Loans  in
the  Trust Estate, and the amount and  timing of mortgagor defaults resulting in
Realized Losses. The rate  of principal payments on  the Mortgage Loans will  in
turn  be affected by the amortization schedules  of the Mortgage Loans, the rate
of principal prepayments (including partial prepayments and those resulting from
refinancing) thereon by  mortgagors, liquidations of  defaulted Mortgage  Loans,
repurchases   of  Mortgage  Loans  by  the  Seller  as  a  result  of  defective
documentation or breaches of  representations and warranties, optional  purchase
by the Seller of defaulted Mortgage Loans and optional purchase by the Seller of
all  of  the Mortgage  Loans in  connection  with the  termination of  the Trust
Estate. See "Pooling and Servicing Agreement -- Optional Termination" herein and
"The Pooling and  Servicing Agreement  -- Assignment  of Mortgage  Loans to  the
Trustee,"  "--  Optional Purchases"  and "--  Termination; Purchase  of Mortgage
Loans" in the Prospectus. Mortgagors are permitted to prepay the Mortgage Loans,
in whole or in part, at any time without penalty.
 
    The rate of payments (including prepayments)  on pools of mortgage loans  is
influenced  by a variety  of economic, geographic, social  and other factors. If
prevailing rates for  similar mortgage  loans fall below  the Mortgage  Interest
Rates  on the Mortgage Loans, the rate of prepayment would generally be expected
to increase. Conversely, if interest rates on similar mortgage loans rise  above
the  Mortgage Interest Rates on the Mortgage Loans, the rate of prepayment would
generally be expected to decrease.
 
    An investor that  purchases any  Offered Certificates at  a discount  should
consider  the risk that a slower than  anticipated rate of principal payments on
the Mortgage  Loans will  result in  an actual  yield that  is lower  than  such
investor's  expected yield. An investor  that purchases any Offered Certificates
at a premium should  consider the risk  that a faster  than anticipated rate  of
principal  payments on the Mortgage Loans will result in an actual yield that is
lower  than  such   investor's  expected  yield.   See  "Prepayment  and   Yield
Considerations" herein.
 
SUBORDINATION
 
    The   rights  of  the  holders  of  the  Class  M  Certificates  to  receive
distributions with respect  to the Mortgage  Loans in the  Trust Estate will  be
subordinated  to such rights of the holders  of the Class A Certificates and the
rights of  the  holders  of  a  Subclass of  Class  B  Certificates  to  receive
distributions  with respect to  the Mortgage Loans  in the Trust  Estate will be
subordinated to such  rights of  the holders of  the Class  A Certificates,  the
Class  M  Certificates and  the Subclasses  of Class  B Certificates  with lower
numerical designations, all to the extent described herein under "Description of
the Certificates -- Subordination of Class M and Class B Certificates."
 
BOOK-ENTRY SYSTEM FOR CERTAIN SUBCLASSES OF CLASS A CERTIFICATES
 
    Transactions in the Subclasses of  Book-Entry Certificates generally can  be
effected  only through DTC, DTC Participants  and Indirect DTC Participants. The
ability of  a  Beneficial  Owner  to  pledge  Book-Entry  Certificates  and  the
liquidity  of the Book-Entry Certificates  in general may be  limited due to the
lack of a physical  certificate for such  Book-Entry Certificates. In  addition,
Beneficial  Owners may experience delays in their receipt of payments. See "Risk
Factors -- Book-Entry System for Certain Classes and Subclasses of Certificates"
and "Description of the Certificates -- Book-Entry Form" in the Prospectus.
 
    See "Risk Factors" in the Prospectus.
 
                                      S-33
<PAGE>
                        DESCRIPTION OF THE CERTIFICATES
 
DENOMINATIONS
 
    The Offered Certificates, other  than the Class A-3,  Class A-4, Class  A-9,
Class  A-R and Class A-LR Certificates,  will be issued in minimum denominations
of $100,000 initial principal balance  and integral multiples of $1,000  initial
principal  balance in excess thereof, except that  one of each of the Class A-1,
Class A-2, Class A-5, Class A-6, Class  A-7, Class A-8, Class A-10, Class  A-11,
Class  A-13 and  Class A-15  Certificates may be  issued in  any denomination in
excess of $100,000. The Class A-3, Class A-4 and Class A-9 Certificates will  be
issued in minimum denominations of $1,000 initial principal balance and integral
multiples  of $1,000 initial principal balance  in excess thereof. The Class A-R
Certificate and  Class  A-LR  Certificate  will  each  be  issued  as  a  single
Certificate with a denomination of $100 initial principal balance.
 
DEFINITIVE FORM
 
    Offered  Certificates  issued  in fully  registered,  certificated  form are
referred to  herein as  "Definitive Certificates."  The Class  A-R, Class  A-LR,
Class  M  and  Offered  Class  B  Certificates  will  be  issued  as  Definitive
Certificates. Distributions of  principal of,  and interest  on, the  Definitive
Certificates  will be  made by  the Trustee  or other  paying agent  directly to
holders of Definitive Certificates in  accordance with the procedures set  forth
in  the Pooling  and Servicing  Agreement. The  Definitive Certificates  will be
transferable and exchangeable at the offices of the Trustee or other certificate
registrar. No service charge will be imposed for any registration of transfer or
exchange, but the Trustee may require payment  of a sum sufficient to cover  any
tax or other governmental charge imposed in connection therewith.
 
BOOK-ENTRY FORM
 
    Each  Subclass of the Book-Entry  Certificates initially will be represented
by one physical certificate registered  in the name of  Cede & Co. ("Cede"),  as
nominee  of  DTC, which  will  be the  "holder"  or "Certificateholder"  of such
Certificates, as such terms are used herein. No person acquiring an interest  in
the Book-Entry Certificates (a "Beneficial Owner") will be entitled to receive a
Definitive  Certificate representing  such person's  interest in  the Book-Entry
Certificates, except  as set  forth under  "Description of  the Certificates  --
Book-Entry Form" in the Prospectus. Unless and until Definitive Certificates are
issued  under  the limited  circumstances described  therein, all  references to
actions taken  by  Certificateholders or  holders  shall,  in the  case  of  the
Book-Entry  Certificates, refer to  actions taken by  DTC upon instructions from
its DTC  Participants (as  defined  under "Description  of the  Certificates  --
Book-Entry Form" in the Prospectus), and all references herein to distributions,
notices,  reports and statements to Certificateholders  or holders shall, in the
case of the  Book-Entry Certificates, refer  to distributions, notices,  reports
and  statements  to DTC  or Cede,  as  the registered  holder of  the Book-Entry
Certificates, as  the case  may be,  for distribution  to Beneficial  Owners  in
accordance  with  DTC  procedures.  See  "Description  of  the  Certificates  --
Book-Entry Form" in the Prospectus.
 
DISTRIBUTIONS
 
    Distributions of interest and in  reduction of principal balance to  holders
of  each  Subclass  of  Class  A  and  Class  B  Certificates  and  the  Class M
Certificates will be made monthly, to  the extent of each Subclass's or  Class's
entitlement  thereto, on the  25th day of  each month or,  if such day  is not a
business day,  on the  succeeding business  day (each,  a "Distribution  Date"),
beginning  in  September 1996.  The "Determination  Date"  with respect  to each
Distribution Date will be the 17th  day of each month, or  if such day is not  a
business  day, the  preceding business day.  Distributions will be  made on each
Distribution Date to  holders of record  (which, in the  case of the  Book-Entry
Certificates,  will be Cede, as nominee for DTC) at the close of business on the
last business day of  the preceding month (each,  a "Record Date"), except  that
the  final distribution  in respect  of any Certificate  will only  be made upon
presentation and surrender of such Certificate at the office or agency appointed
by the Trustee and specified in the  notice of final distribution in respect  of
such Certificate.
 
                                      S-34
<PAGE>
    The  aggregate amount  available for  distribution to  Certificateholders on
each  Distribution  Date  will  be  the  Pool  Distribution  Amount.  The  "Pool
Distribution  Amount" for a Distribution Date will  be the sum of all previously
undistributed payments  or other  receipts on  account of  principal  (including
principal prepayments and Liquidation Proceeds in respect of principal, if any),
and  interest on  or in  respect of  the Mortgage  Loans received  by the Master
Servicer, including without  limitation any related  insurance proceeds and  the
proceeds   of  any  purchase  of  a  related  Mortgage  Loan  for  breach  of  a
representation or warranty or the sale of a Mortgaged Property by a Servicer  in
connection  with the liquidation of the related Mortgage Loan on or prior to the
Remittance Date in the  month in which such  Distribution Date occurs, plus  (i)
all  Periodic Advances made and (ii)  all other amounts (including any insurance
proceeds and Compensating  Interest) placed  in the Certificate  Account by  any
Servicer on or before the Remittance Date or by the Master Servicer on or before
the  Distribution  Date pursuant  to the  Pooling  and Servicing  Agreement, but
excluding the following:
 
        (a)  amounts  received  as  late  payments  of  principal  or   interest
    respecting which one or more unreimbursed Periodic Advances has been made;
 
        (b) to the extent permitted by the Pooling and Servicing Agreement, that
    portion  of  Liquidation  Proceeds  with respect  to  a  Mortgage  Loan that
    represents any unreimbursed Periodic Advances of such Servicer;
 
        (c) those portions of each payment of interest on a particular  Mortgage
    Loan  which  represent (i)  the applicable  Servicing  Fee, (ii)  the Master
    Servicing Fee and (iii) the Fixed Retained Yield, if any;
 
        (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   principal  prepayments   in  full,   all  partial   principal
    prepayments,  all proceeds  of any  Mortgage Loans  or property  acquired in
    respect thereof,  or  liquidated  pursuant  to  the  Pooling  and  Servicing
    Agreement,  including net Partial Liquidation Proceeds but excluding any Net
    Foreclosure Profits (as defined under "-- Additional Rights of the Class A-R
    and Class A-LR Certificateholders" below), and other unscheduled receipts in
    respect of  principal  of  the  Mortgage Loans  other  than  proceeds  of  a
    repurchase  of a  Mortgage Loan  by the Seller  or amounts  deposited by the
    Seller in the Certificate Account in  connection with the substitution of  a
    Mortgage  Loan  (collectively, "Unscheduled  Principal Receipts")  that were
    received by the Servicers after the Unscheduled Principal Receipt Period (as
    described under "Servicing  of the Mortgage  Loans -- Unscheduled  Principal
    Receipts"  below) 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 on  or following  the Due  Date in  the month  in which  such
    Distribution  Date occurs and the excess  of the unpaid principal balance of
    any defective Mortgage Loan for which  a Mortgage Loan was substituted  over
    the  unpaid  principal  balance  of such  substituted  Mortgage  Loan  on or
    following the Due Date in the month in which such Distribution Date occurs;
 
        (g) to the extent permitted by the Pooling and Servicing Agreement, that
    portion of  Liquidation Proceeds  or insurance  proceeds with  respect to  a
    Mortgage  Loan or proceeds  of any Mortgaged Property  that becomes owned by
    the Trustee which represents  any unpaid Servicing  Fee or Master  Servicing
    Fee  to  which  such  Servicer  or  the  Master  Servicer,  respectively, is
    entitled, or which represents unpaid  Fixed Retained Yield, and the  portion
    of  net  Liquidation Proceeds  used to  reimburse any  unreimbursed Periodic
    Advances;
 
        (h) all amounts representing certain expenses reimbursable to the Master
    Servicer and other amounts permitted to  be retained by the Master  Servicer
    or withdrawn by the Master Servicer from the Certificate Account pursuant to
    the Pooling and Servicing Agreement;
 
                                      S-35
<PAGE>
        (i)  reinvestment  earnings  on  payments  received  in  respect  of the
    Mortgage Loans or on other amounts on deposit in the Certificate Account;
 
         (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.
 
    The "Remittance Date" with respect to any Distribution Date and any Mortgage
Loan serviced by an Other Servicer will be the 18th day of each month, or if any
such  day is  not a  business day, the  preceding business  day. The "Remittance
Date" with respect to  any Distribution Date and  any Mortgage Loan serviced  by
Norwest  Mortgage  will,  except  as described  below  under  "Servicing  of the
Mortgage Loans --  Anticipated Changes in  Servicing," be the  24th day of  each
month, or if any such day is not a business day, the preceding business day.
 
    "Partial  Liquidation  Proceeds"  are  Liquidation  Proceeds  received  by a
Servicer on a Mortgage  Loan prior to such  Mortgage Loan becoming a  Liquidated
Loan  and "net  Partial Liquidation  Proceeds" are  Partial Liquidation Proceeds
less expenses incurred with respect to such liquidation.
 
    Each Servicer  is required  to deposit  in the  Certificate Account  on  the
Remittance  Date certain amounts in  respect of the Mortgage  Loans as set forth
herein under "Servicing of the Mortgage Loans -- Custodial Accounts." The Master
Servicer is required to remit to the Trustee on or before the Distribution  Date
any payments constituting part of the Pool Distribution Amount that are received
by the Master Servicer or are required to be made with the Master Servicer's own
funds.  Except  as described  below under  "Description  of the  Certificates --
Periodic Advances," neither the Master Servicer nor the Trustee is obligated  to
remit  any amounts which  a Servicer was  required but failed  to deposit in the
Certificate Account.
 
    On each Distribution Date,  the Pool Distribution  Amount will be  allocated
among  the Classes or Subclasses of  Certificates and distributed to the holders
thereof of  record  as  of  the  related  Record  Date  as  follows  (the  "Pool
Distribution Amount Allocation"):
 
      FIRST,  to the Subclasses of Class A Certificates, pro rata based on their
respective Class A Subclass Interest Accrual  Amounts in an aggregate amount  up
to the sum of the Class A Subclass Interest Accrual Amounts with respect to such
Distribution   Date;  provided,   that  prior  to   their  respective  Accretion
Termination Dates,  an  amount equal  to  the  amount that  would  otherwise  be
distributable  in respect of interest to the  Class A-11 Certificates and to the
Class A-12  Certificates by  virtue  of the  Class  A-12 TAC  Accrual  Component
pursuant  to this  provision will  be distributed  in reduction  of the  Class A
Subclass Principal Balances of the Accretion Directed Certificates and the Class
A-11 Certificates and  the Component  Principal Balance  of the  Class A-12  TAC
Accrual   Component,  as  set   forth  below  under   "--  Principal  (Including
Prepayments) -- Allocation of Amount to be Distributed;"
 
      SECOND, to the Subclasses of Class A Certificates, pro rata based on their
respective unpaid Class A  Subclass Interest Shortfall  Amounts in an  aggregate
amount  up  to  the sum  of  the  previously unpaid  Class  A  Subclass Interest
Shortfall  Amounts;  provided,   that  prior  to   their  respective   Accretion
Termination  Dates,  an  amount equal  to  the  amount that  would  otherwise be
distributable in respect of interest  shortfalls to the Class A-11  Certificates
and  to the  Class A-12  Certificates by  virtue of  the Class  A-12 TAC Accrual
Component pursuant to  this provision will  be distributed in  reduction of  the
Class  A Subclass Principal Balances of  the Accretion Directed Certificates and
the Class A-11  Certificates and the  Component Principal Balance  of the  Class
A-12  TAC Accrual Component,  as set forth below  under "-- Principal (Including
Prepayments) -- Allocation of Amount to be Distributed;"
 
      THIRD, concurrently, pro rata to the Class A Certificates (other than  the
Class  A-12 Certificates with respect to the  Class A-12 PO Component), based on
the Class A-Non  PO Optimal Principal  Amount, and the  Class A-12  Certificates
with    respect   to   the    Class   A-12   PO    Component,   based   on   the
 
                                      S-36
<PAGE>
Class A-12 PO Component Optimal Principal Amount, (A) to the Subclasses of Class
A Certificates, (other  than the  Class A-12  Certificates with  respect to  the
Class A-12 PO Component) 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 the priorities  set forth below  under "-- Principal  (Including
Prepayments)  -- Allocation of  Amount to be  Distributed" and (B)  to the Class
A-12 Certificates with respect to the Class A-12 PO Component in an amount up to
the Class A-12 PO Component Optimal Principal Amount;
 
      FOURTH, to the Class A-12 Certificates  with respect to the Class A-12  PO
Component  in an amount up  to the Class A-12  PO Component Deferred Amount, but
only, first  from  amounts  otherwise  distributable  (without  regard  to  this
priority)  to  the Subclasses  of Class  B  Certificates pursuant  to priorities
FOURTEENTH clause (C),  THIRTEENTH and  TENTH of this  Pool Distribution  Amount
Allocation and then from amounts otherwise distributable (without regard to this
priority)  to the Class M Certificates pursuant to priority SEVENTH of this Pool
Distribution Amount Allocation;
 
      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  sum of  the
previously unpaid Class M Interest Shortfall Amounts;
 
      SEVENTH,  to  the Class  M Certificates  in an  amount up  to the  Class M
Optimal Principal  Amount;  provided,  however, that  the  amount  distributable
pursuant to this priority SEVENTH to the Class M Certificates will be reduced by
the  amount, if any, otherwise distributable  as principal hereunder used to pay
the Class A-12 PO Component Deferred Amount in accordance with priority FOURTH;
 
      EIGHTH, to the  Class B-1  Certificates in  an amount  up to  the Class  B
Subclass  Interest  Accrual  Amount  for  such  Subclass  with  respect  to such
Distribution Date;
 
      NINTH, to the Class  B-1 Certificates in  an amount up to  the sum of  the
previously unpaid Class B Subclass Interest Shortfall Amounts for such Subclass;
 
      TENTH,  to the Class  B-1 Certificates in  an amount up  to the Subclass B
Optimal Principal Amount for such  Subclass; provided, however, that the  amount
distributable  pursuant to this priority TENTH will be reduced by the amount, if
any, otherwise distributable as principal hereunder  used to pay the Class  A-12
PO Component Deferred Amount in accordance with priority FOURTH;
 
      ELEVENTH,  to the Class  B-2 Certificates in  an amount up  to the Class B
Subclass Interest  Accrual  Amount  for  such  Subclass  with  respect  to  such
Distribution Date;
 
      TWELFTH,  to the Class B-2 Certificates in an  amount up to the sum of the
previously unpaid Class B Subclass Interest Shortfall Amounts for such Subclass;
 
      THIRTEENTH, to the Class B-2 Certificates in an amount up to the  Subclass
B Optimal Principal Amount for such Subclass; provided, however, that the amount
distributable  pursuant  to  this priority  THIRTEENTH  will be  reduced  by the
amount, if any, otherwise distributable as  principal hereunder used to pay  the
Class A-12 PO Component Deferred Amount in accordance with priority FOURTH; and
 
      FOURTEENTH,  sequentially,  to  the Class  B-3,  Class B-4  and  Class B-5
Certificates so that each such  Subclass shall receive (A)  an amount up to  its
Class B Subclass Interest Accrual Amount with respect to such Distribution Date,
(B)  then,  an amount  up to  its  previously unpaid  Class B  Subclass Interest
Shortfall Amounts  and (C)  finally, an  amount  up to  its Subclass  B  Optimal
Principal  Amount  before any  Subclasses of  Class  B Certificates  with higher
numerical designations receive any payments in respect of interest or principal;
provided, however,  that  the amount  distributable  pursuant to  this  priority
FOURTEENTH  clause (C) to any Subclasses of Class B Certificates will be reduced
by the amount, if  any, otherwise distributable as  principal hereunder used  to
pay  the Class  A-12 PO  Component Deferred  Amount in  accordance with priority
FOURTH.
 
                                      S-37
<PAGE>
    The "Class A Non-PO Distribution Amount"  for any Distribution Date will  be
equal to the sum of the amounts distributed in accordance with priorities FIRST,
SECOND and THIRD clause (A) of the Pool Distribution Amount Allocation set forth
above.
 
    The "Class M Distribution Amount" for any Distribution Date will be equal to
the  sum of the amounts distributed  in accordance with priorities FIFTH through
SEVENTH of the Pool Distribution Amount Allocation set forth above.
 
    The "Class B Subclass Distribution Amount" for any Distribution Date and the
Class B-1 or  Class B-2 Certificates  will be equal  to the sum  of the  amounts
distributed  in  accordance with  priorities EIGHTH  through  TENTH of  the Pool
Distribution Amount Allocation  set forth above  with respect to  the Class  B-1
Certificates and priorities ELEVENTH through THIRTEENTH of the Pool Distribution
Amount Allocation set forth above with respect to the Class B-2 Certificates.
 
    The undivided percentage interest (the "Percentage Interest") represented by
any  Certificate of  a Subclass  or Class in  distributions to  such Subclass or
Class will be equal to the percentage obtained by dividing the initial principal
balance of such Certificate  by the aggregate initial  principal balance of  all
Certificates of such Subclass or Class.
 
INTEREST
 
    The  amount  of  interest that  will  accrue  on each  Subclass  of  Class A
Certificates during  each month,  after taking  into account  any  Non-Supported
Interest Shortfalls and the interest portion of certain losses allocated to such
Subclass,  is  referred to  herein  as the  "Class  A Subclass  Interest Accrual
Amount" for such Subclass. The Class A Subclass Interest Accrual Amount for each
Subclass of Class A Certificates, other  than the Class A-12 Certificates,  will
equal  the difference between (a) the product  of (i) 1/12th of the Pass-Through
Rate for  such Subclass  and (ii)  the outstanding  Class A  Subclass  Principal
Balance  of such  Subclass and  (b) the  sum of  (i) any  Non-Supported Interest
Shortfall allocable to such  Subclass, (ii) the interest  portion of any  Excess
Special  Hazard  Losses,  Excess  Fraud  Losses  and  Excess  Bankruptcy  Losses
allocable to  such Subclass  and  (iii) the  interest  portion of  any  Realized
Losses,  other than  the interest portion  of any Excess  Special Hazard Losses,
Excess Fraud Losses and Excess Bankruptcy Losses, allocable to such Subclass  on
or after the Cross-Over Date. The pass-through rate for each Subclass of Class A
Certificates  (other than the Class A-12 Certificates) (the "Pass-Through Rate")
is the percentage set forth on the cover of this Prospectus Supplement.
 
    The Class A Subclass Interest Accrual Amount for the Class A-12 Certificates
will equal the sum of the Component Interest Accrual Amounts for the Class  A-12
TAC  Accrual Component, Class A-12 IO A Component, Class A-12 IO B Component and
Class A-12 IO C Component. The amount of interest that will accrue on each  such
Component  during  each  month,  after  taking  into  account  any Non-Supported
Interest Shortfalls and the interest portion of certain losses allocated to such
Component, is referred to herein as the "Component Interest Accrual Amount"  for
such Component.
 
    The  Component  Interest  Accrual  Amount for  the  Class  A-12  TAC Accrual
Component will equal the difference between (a) the product of (i) 1/12th of the
Component Rate for such Component  and (ii) the outstanding Component  Principal
Balance  of such Component  and (b) the  sum of such  Component's pro rata share
based on interest accrued of (i) any Non-Supported Interest Shortfall  allocable
to  the Class A-12 Certificates, (ii) the interest portion of any Excess Special
Hazard Losses, Excess Fraud Losses and Excess Bankruptcy Losses allocable to the
Class A-12 Certificates and (iii) the  interest portion of any Realized  Losses,
other  than the  interest portion  of any  Excess Special  Hazard Losses, Excess
Fraud  Losses  and  Excess  Bankruptcy  Losses,  allocable  to  the  Class  A-12
Certificates on or after the Cross-Over Date.
 
    The "Component Rate" for the Class A-12 TAC Accrual Component is 7.75%.
 
    The Component Interest Accrual Amount for the Class A-12 IO A Component will
equal  the  difference between  (a)  the sum  of (i)  the  product of  1/12th of
0.35000% and the Class A Subclass
 
                                      S-38
<PAGE>
Principal Balance of the Class A-8  Certificates and (ii) the product of  1/12th
of  approximately 0.17724%  and the  Class A  Subclass Principal  Balance of the
Class A-15 Certificates and (b) the sum of such Component's pro rata share based
on interest accrued of (i) any Non-Supported Interest Shortfall allocable to the
Class A-12 Certificates, (ii) the interest portion of any Excess Special  Hazard
Losses,  Excess Fraud Losses and Excess Bankruptcy Losses allocable to the Class
A-12 Certificates and (iii) the interest  portion of any Realized Losses,  other
than  the interest  portion of  any Excess  Special Hazard  Losses, Excess Fraud
Losses and Excess Bankruptcy Losses, allocable to the Class A-12 Certificates on
or after the Cross-Over Date.
 
    The Component Interest Accrual Amount for the Class A-12 IO B Component will
equal the  difference between  (a)  the sum  of (i)  the  product of  1/12th  of
0.60000%   and  the  Class  A  Subclass  Principal  Balance  of  the  Class  A-9
Certificates, (ii) the product  of 1/12th of 0.55000%  and the Class A  Subclass
Principal Balance of the Class A-14 Certificates and (iii) the product of 1/12th
of  approximately 0.07276%  and the  Class A  Subclass Principal  Balance of the
Class A-15 Certificates and (b) the sum of such Component's pro rata share based
on interest accrued of (i) any Non-Supported Interest Shortfall allocable to the
Class A-12 Certificates, (ii) the interest portion of any Excess Special  Hazard
Losses,  Excess Fraud Losses and Excess Bankruptcy Losses allocable to the Class
A-12 Certificates and (iii) the interest  portion of any Realized Losses,  other
than  the interest  portion of  any Excess  Special Hazard  Losses, Excess Fraud
Losses and Excess Bankruptcy Losses, allocable to the Class A-12 Certificates on
or after the Cross-Over Date.
 
    The Component Interest Accrual Amount for the Class A-12 IO C Component will
equal the difference between (a) the product  of 1/12th of 0.75000% and the  sum
of  the Class  A Subclass Principal  Balances of  the Class A-2,  Class A-10 and
Class A-16 Certificates and (b) the sum of such Component's pro rata share based
on interest accrued of (i) any Non-Supported Interest Shortfall allocable to the
Class A-12 Certificates, (ii) the interest portion of any Excess Special  Hazard
Losses,  Excess Fraud Losses and Excess Bankruptcy Losses allocable to the Class
A-12 Certificates and (iii) the interest  portion of any Realized Losses,  other
than  the interest  portion of  any Excess  Special Hazard  Losses, Excess Fraud
Losses and Excess Bankruptcy Losses, allocable to the Class A-12 Certificates on
or after the Cross-Over Date.
 
    The Class  A-12 IO  A Component  is an  interest-only Component  and has  no
principal  balance. Any distributions in respect of principal made to, or losses
in respect  of  principal  allocated  in reduction  of,  the  Class  A  Subclass
Principal  Balance of the Class A-8 or  Class A-15 Certificates will result in a
reduction of the Component  Interest Accrual Amount of  such Component. See  "--
Principal  (Including Prepayments)" and "-- Subordination of Class M and Class B
Certificates -- Allocation of Losses" herein.
 
    The Class  A-12 IO  B Component  is an  interest-only Component  and has  no
principal  balance. Any distributions in respect of principal made to, or losses
in respect  of  principal  allocated  in reduction  of,  the  Class  A  Subclass
Principal  Balance of the Class A-9, Class  A-14 or Class A-15 Certificates will
result in  a  reduction  of  the  Component  Interest  Accrual  Amount  of  such
Component.  See  "--Principal (Including  Prepayments)" and  "--Subordination of
Class M and Class B Certificates -- Allocation of Losses" herein.
 
    The Class  A-12 IO  C Component  is an  interest-only Component  and has  no
principal  balance. Any distributions in respect of principal made to, or losses
in respect  of  principal  allocated  in reduction  of,  the  Class  A  Subclass
Principal  Balance of the Class A-2, Class  A-10 or Class A-16 Certificates will
result in  a  reduction  of  the  Component  Interest  Accrual  Amount  of  such
Component.  See  "--Principal (Including  Prepayments)" and  "--Subordination of
Class M and Class B Certificates -- Allocation of Losses" herein.
 
    No interest will accrue  on the Class  A-12 PO Component  of the Class  A-12
Certificates.
 
    The  amount of interest that will accrue  on the Class M Certificates during
each month, after taking into account any Non-Supported Interest Shortfalls  and
the interest portion of certain losses
 
                                      S-39
<PAGE>
allocated  to such Class, is referred to herein as the "Class M Interest Accrual
Amount." The Class M Interest Accrual  Amount will equal the difference  between
(a)  the  product  of (i)  1/12th  of 7.75%  and  (ii) the  outstanding  Class M
Principal Balance and (b)  the sum of (i)  any Non-Supported Interest  Shortfall
allocable  to such  Class and  (ii) the interest  portion of  any Excess Special
Hazard Losses, Excess  Fraud Losses  and Excess Bankruptcy  Losses allocable  to
such Class.
 
    The  amount  of  interest that  will  accrue  on each  Subclass  of  Class B
Certificates during  each month,  after taking  into account  any  Non-Supported
Interest Shortfalls and the interest portion of certain losses allocated to such
Subclass,  is  referred to  herein  as the  "Class  B Subclass  Interest Accrual
Amount." The Class B Subclass Interest Accrual Amount will equal the  difference
between  (a) the product of (i) 1/12th of 7.75% and (ii) the outstanding Class B
Subclass Principal Balance  and (b) the  sum of (i)  any Non-Supported  Interest
Shortfall allocable to such Subclass and (ii) the interest portion of any Excess
Special  Hazard  Losses,  Excess  Fraud  Losses  and  Excess  Bankruptcy  Losses
allocable to such Subclass.
 
    The  "Class  A  Subclass  Principal  Balance"  of  a  Subclass  of  Class  A
Certificates  (other than the  Class A-12 Certificates)  as of any Determination
Date will be  the principal  balance of  such Subclass  on the  date of  initial
issuance  of  the Class  A  Certificates plus,  in the  case  of the  Class A-11
Certificates, the Class  A-11 Accrual  Distribution Amount,  as described  under
"--  Principal (Including  Prepayments)" below previously  added to  the Class A
Subclass Principal Balance of the Class A-11 Certificates, less (i) all  amounts
previously  distributed to holders of Certificates of such Subclass in reduction
of the principal  balance of  such Subclass and  (ii) such  Subclass's pro  rata
share  of the  principal portion of  Excess Special Hazard  Losses, Excess Fraud
Losses and Excess Bankruptcy Losses previously allocated to the holders of Class
A Certificates (other than the Class A-12 Certificates with respect to the Class
A-12 PO Component)  in the manner  described herein under  "-- Subordination  of
Class  M and Class B Certificates -- Allocation of Losses." After the Cross-Over
Date, the Class A  Subclass Principal Balance  of a Subclass  may be subject  to
further  reduction in an amount  equal to such Subclass's  pro rata share of the
difference, if any, between (a) the Class A Non-PO Principal Balance as of  such
Determination  Date  without regard  to this  provision  and (b)  the difference
between (i) the  Adjusted Pool Amount  for the preceding  Distribution Date  and
(ii)  the Adjusted Pool Amount (PO Portion) for the preceding Distribution Date.
Any pro rata allocation among the  Subclasses of Class A Certificates  described
in  this paragraph  will be  made among the  Subclasses of  Class A Certificates
(other than  the  Class  A-12  Certificates) and  the  Class  A-12  TAC  Accrual
Component  on the  basis of  their then-outstanding  Class A  Subclass Principal
Balances or  Component Principal  Balance or,  in  the case  of the  Class  A-11
Certificates  and  the Class  A-12 TAC  Accrual Component,  the initial  Class A
Subclass Principal Balance or the initial Component Principal Balance, if lower,
immediately prior to the preceding Distribution Date.
 
    The Class A Subclass Principal Balance of the Class A-12 Certificates as  of
any  Determination Date  will be  equal to  the sum  of the  Component Principal
Balances of  the  Class  A-12  TAC  Accrual Component  and  the  Class  A-12  PO
Component.
 
    The "Component Principal Balance" of the Class A-12 TAC Accrual Component as
of any Determination Date will be the principal balance of such Component on the
date  of initial issuance  of the Class  A Certificates plus  the Class A-12 TAC
Accrual  Component  Distribution  Amount,  as  described  under  "--   Principal
(Including  Prepayments)"  below, previously  added  to the  Component Principal
Balance of the Class A-12 TAC Accrual Component, less (i) all amounts previously
distributed in reduction  of the principal  balance of such  Component and  (ii)
such  Components's pro  rata share  of the  principal portion  of Excess Special
Hazard Losses,  Excess  Fraud Losses  and  Excess Bankruptcy  Losses  previously
allocated  to the Class  A Certificates (other than  the Class A-12 Certificates
with respect to  the Class  A-12 PO Component)  in the  manner described  herein
under  "-- Subordination of  Class M and  Class B Certificates  -- Allocation of
Losses." After  the Cross-Over  Date, the  Component Principal  Balance of  such
Component  may  be subject  to  further reduction  in  an amount  equal  to such
Component's pro rata share of  the difference, if any,  between (a) the Class  A
Non-PO  Principal Balance as  of such Determination Date  without regard to this
provision and (b) the
 
                                      S-40
<PAGE>
difference between (i) the Adjusted  Pool Amount for the preceding  Distribution
Date  and  (ii)  the  Adjusted  Pool  Amount  (PO  Portion)  for  the  preceding
Distribution Date. Any pro rata allocation  described in this paragraph will  be
made  among the Subclasses  of Class A  Certificates (other than  the Class A-12
Certificates) and the  Class A-12 TAC  Accrual Component on  the basis of  their
then-outstanding  Class  A Subclass  Principal  Balances or  Component Principal
Balance or, in the case  of the Class A-11 Certificates  and the Class A-12  TAC
Accrual Component, the initial Class A Subclass Principal Balance or the initial
Component  Principal  Balance,  if  lower, immediately  prior  to  the preceding
Distribution Date.
 
    The "Component Principal Balance" of the  Class A-12 PO Component as of  any
Determination  Date will be the principal balance  of such Component on the date
of initial issuance of the Class A Certificates less (i) all amounts  previously
distributed  to the  holders of  the Class A-12  Certificates in  respect of the
Class A-12 PO Component  pursuant to priorities THIRD  clause (B) and FOURTH  of
the Pool Distribution Amount Allocation and (ii) the principal portion of Excess
Special  Hazard  Losses,  Excess  Fraud  Losses  and  Excess  Bankruptcy  Losses
previously allocated to  the Class  A-12 PO  Component in  the manner  described
herein under "-- Subordination of Class M and Class B Certificates -- Allocation
of  Losses." After the  Cross-Over Date, the Component  Principal Balance of the
Class A-12 PO Component will be subject to further reduction in an amount  equal
to  the excess, if any, of (a) the Component Principal Balance of the Class A-12
PO Component as of such Determination Date without regard to this provision over
(b) the Adjusted Pool Amount (PO Portion) for the preceding Distribution Date.
 
    The "Class A Non-PO Principal Balance" as of any Determination Date will  be
equal to the sum of the Class A Subclass Principal Balances of the Subclasses of
Class  A Certificates (other than the Class A-12 Certificates) and the Component
Principal Balance of the Class A-12 TAC Accrual Component as of such date.
 
    The "Class M  Principal Balance" as  of any Determination  Date will be  the
lesser  of (a) the principal balance of the  Class M Certificates on the date of
initial issuance of  the Class M  Certificates less (i)  all amounts  previously
distributed to holders of the Class M Certificates in reduction of the principal
balance  thereof and (ii) the principal portion of Excess Special Hazard Losses,
Excess Fraud Losses  and Excess  Bankruptcy Losses previously  allocated to  the
holders  of  the  Class M  Certificates  in  the manner  described  herein under
"-- Subordination of Class M and  Class B Certificates -- Allocation of  Losses"
and  (b) the Adjusted Pool Amount as of the preceding Distribution Date less the
sum of (i) the Class A Non-PO Principal Balance and (ii) the Component Principal
Balance of the Class A-12 PO Component, each as of such Determination Date.
 
    The  "Class  B  Subclass  Principal  Balance"  of  a  Subclass  of  Class  B
Certificates  as  of  any Determination  Date  will  be the  lesser  of  (a) the
principal balance of such Subclass on the date of initial issuance of the  Class
B  Certificates less (i)  all amounts previously distributed  to holders of such
Subclass in reduction of  the principal balance thereof  and (ii) the  principal
portion  of  Excess  Special  Hazard  Losses,  Excess  Fraud  Losses  and Excess
Bankruptcy Losses previously allocated  to the holders of  such Subclass in  the
manner   described   under   "--  Subordination   of   Class  M   and   Class  B
Certificates -- Allocation of Losses" and (b) the Adjusted Pool Amount as of the
preceding Distribution Date  less the sum  of (i) the  Class A Non-PO  Principal
Balance,  (ii) the Component  Principal Balance of the  Class A-12 PO Component,
(iii) the Class  M Principal Balances  and (iv) the  Class B Subclass  Principal
Balances  of  the  Subclasses  of  Class  B  Certificates  with  lower numerical
designations, each as of such Determination Date.
 
    The "Class B Principal Balance" as of any  date will be equal to the sum  of
the   Class  B  Subclass  Principal  Balances  of  the  Subclasses  of  Class  B
Certificates as of such date.
 
    With respect to any Distribution Date, the "Adjusted Pool Amount" will equal
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 amounts  received as Periodic  Advances, principal prepayments
and Liquidation Proceeds in respect of principal) and distributed to holders  of
 
                                      S-41
<PAGE>
the  Series  1996-4  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.
 
    With respect  to  any  Distribution  Date, the  "Adjusted  Pool  Amount  (PO
Portion)" will equal the sum as to each Mortgage Loan outstanding at the Cut-Off
Date  of the product of (A)  the PO Fraction for such  Mortgage Loan and (B) the
principal balance of such Mortgage Loan as  of the Cut-Off Date less the sum  of
(i)  all amounts in  respect of principal  received in respect  of such Mortgage
Loan (including amounts received as Periodic Advances, principal prepayments and
Liquidation Proceeds in respect of principal) and distributed to holders of  the
Series  1996-4 Certificates on such Distribution Date and all prior Distribution
Dates and (ii) 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 the month in which such Distribution Date occurs.
 
    The "Net Mortgage Interest Rate" on each Mortgage Loan will be equal to  the
Mortgage  Interest Rate on such Mortgage Loan  as stated in the related mortgage
note minus the sum of  (i) the Servicing Fee Rate  of 0.25% per annum, (ii)  the
Master  Servicing Fee Rate and (iii) the  Fixed Retained Yield rate, if any, for
such Mortgage  Loan. See  "Servicing of  the Mortgage  Loans --  Fixed  Retained
Yield; Servicing Compensation and Payment of Expenses" herein.
 
    When  mortgagors prepay  principal, or  when principal  is recovered through
foreclosure sales or  other liquidations  of defaulted Mortgage  Loans, or  when
other  Unscheduled Principal  Receipts occur,  a full  month's interest  for the
month of payment or recovery may not be paid or recovered, resulting in interest
shortfalls to the extent that  such payment or recovery  is not included in  the
distribution  to Certificateholders made  in the month in  which it is received.
Interest shortfalls  resulting  from  principal  prepayments  in  full  made  by
mortgagors  ("Prepayments  in  Full")  are  referred  to  herein  as "Prepayment
Interest Shortfalls." The Master Servicer will  be obligated, on or before  each
Distribution  Date, to pay to the Trustee for the benefit of Certificateholders,
from the Master Servicer's own funds (including amounts otherwise payable to the
Master Servicer in respect of such  Distribution Date as Master Servicing  Fees)
an  amount (such amount, "Compensating Interest") equal to the lesser of (i) the
aggregate Prepayment Interest Shortfall with  respect to such Distribution  Date
and  (ii) the lesser of (X) the product of  (A) 1/12th of 0.20% and (B) the Pool
Scheduled Principal Balance  for such  Distribution Date and  (Y) the  Available
Master Servicing Compensation for such Distribution Date.
 
    The "Available Master Servicing Compensation" for any Distribution Date will
be  equal to 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
deposited  in the Certificate Account (which  amount of interest with respect to
Prepayments in  Full on  the  Mortgage Loans  serviced  by Norwest  Mortgage  is
expected  to be zero unless the Remittance  Date for such Mortgage Loans changes
as described below under "Servicing of the Mortgage Loans -- Anticipated Changes
in Servicing") and (c)  the aggregate amount of  Month End Interest remitted  by
the  Servicers  to  the  Master  Servicer  pursuant  to  the  related Underlying
Servicing Agreements. With  respect to  the Mortgage Loans  serviced by  Norwest
Mortgage,  "Month End Interest" for each Distribution  Date will be equal to the
lesser of (i) the aggregate Prepayment  Interest Shortfalls with respect to  the
Mortgage  Loans serviced by Norwest  Mortgage and (ii) the  product of 1/12th of
0.20% and  the  aggregate scheduled  principal  balance (as  determined  in  the
applicable  Underlying Servicing  Agreement) of  the Mortgage  Loans serviced by
Norwest Mortgage. With  respect to  the Mortgage  Loans serviced  by each  Other
Servicer,  "Month End Interest" for each Distribution  Date will be equal to the
lesser of  (i) the  sum  of the  aggregate  Prepayment Interest  Shortfalls  and
aggregate  Curtailment Interest  Shortfalls with  respect to  the Mortgage Loans
serviced by such Other Servicer and (ii) the sum of (X) the product of 1/12th of
0.25% and  the  aggregate scheduled  principal  balance (as  determined  in  the
applicable  Underlying Servicing  Agreement) of  the Mortgage  Loans serviced by
such Other  Servicer  and (Y)  reinvestment  earnings on  payments  received  in
respect  of the  Mortgage Loans or  on other  amounts on deposit  in the related
Servicer Custodial
 
                                      S-42
<PAGE>
Account  pursuant  to  the  related  Underlying  Servicing  Agreement  on   such
Distribution  Date (other  than with respect  to the Mortgage  Loans serviced by
Countrywide Home  Loans,  Inc.). As  described  below under  "Servicing  of  the
Mortgage Loans -- Anticipated Changes in Servicing," any or all of the Servicers
may  be required to begin to remit  to the Master Servicer Unscheduled Principal
Receipts in full for deposit into  the Certificate Account daily on a  specified
business  day following receipt thereof which will generally result in a deposit
earlier than on the following Remittance Date and, in conjunction therewith, may
be relieved of its obligation to remit  Month End Interest. Any such change  may
have  an impact on the amount of  Compensating Interest by increasing the amount
described in  clause  (b)  of  the  definition  of  Available  Master  Servicing
Compensation and decreasing the amount described in clause (c) of the definition
thereof.  No assurance can be given as to the timing of any such changes or that
any such changes will occur.
 
    As to any Distribution  Date, Prepayment Interest  Shortfalls to the  extent
that  they exceed Compensating Interest are referred to herein as "Non-Supported
Interest Shortfalls"  and will  be allocated  to (i)  the Class  A  Certificates
according  to the percentage  obtained by dividing  the then-outstanding Class A
Non-PO Principal  Balance by  the sum  of the  then-outstanding Class  A  Non-PO
Principal Balance, Class M Principal Balance and Class B Principal Balance, (ii)
the  Class M Certificates  according to the percentage  obtained by dividing the
then-outstanding Class M Principal  Balance by the  sum of the  then-outstanding
Class  A  Non-PO  Principal  Balance,  Class M  Principal  Balance  and  Class B
Principal Balance and (iii) the Class B Certificates according to the percentage
obtained by dividing the then-outstanding Class  B Principal Balance by the  sum
of  the then-outstanding  Class A  Non-PO Principal  Balance, Class  M Principal
Balance and  Class B  Principal Balance.  Such allocation  of the  Non-Supported
Interest  Shortfall will reduce the amount of  interest due to be distributed to
holders of the Class A Certificates then entitled to distributions in respect of
interest or, in  the case  of the  Class A-11  Certificates and  the Class  A-12
Certificates with respect to the Class A-12 TAC Accrual Component prior to their
respective  Accretion  Termination Dates,  will  reduce the  amount  of interest
accrued on  and then  added  to, respectively,  the  principal balance  and  the
Component  Principal  Balance  thereof.  Such  allocation  of  the Non-Supported
Interest Shortfall will also reduce the amount of interest due to be distributed
to the holders of  the Class M  Certificates and the  Class B Certificates.  Any
such  reduction in respect of interest allocated  to the Class A Certificates or
Class B Certificates will be allocated among such Subclasses of Class A or Class
B Certificates, as the case  may be, pro rata on  the basis of their  respective
Class  A Subclass Interest  Accrual Amount or Class  B Subclass Interest Accrual
Amount, without regard  to any reduction  pursuant to this  paragraph, for  such
Distribution  Date. Any Non-Supported Interest  Shortfall allocated to the Class
A-12 Certificates will be allocated among the Class A-12 Components (other  than
the Class A-12 PO Component) pro rata on the basis of their respective Component
Interest  Accrual  Amounts, without  regard to  any  reduction pursuant  to this
paragraph, for such Distribution Date.
 
    Any interest shortfalls arising from Unscheduled Principal Receipts in  full
that  are not Prepayments in Full and any interest shortfalls resulting from the
timing  of  the   receipt  of  partial   principal  prepayments  by   mortgagors
("Curtailment  Interest Shortfalls")  or of other  partial Unscheduled Principal
Receipts with respect to the Mortgage  Loans will not be offset by  Compensating
Interest,  but  instead  will  be  borne first  by  the  Subclasses  of  Class B
Certificates in reverse numerical order, second by the Class M Certificates  and
then  pro rata by the Class A Certificates. See "Description of the Certificates
- -- Subordination  of  Class  M  and Class  B  Certificates"  herein.  After  the
Cross-Over  Date  all  interest shortfalls  arising  from  Unscheduled Principal
Receipts, other  than Prepayment  Interest  Shortfalls covered  by  Compensating
Interest,  will be treated as Non-Supported Interest Shortfalls and allocated in
reduction of interest accrued on the Class A Certificates.
 
    The interest  portion of  any  Excess Special  Hazard Losses,  Excess  Fraud
Losses  or Excess Bankruptcy Losses will be allocated among the Class A, Class M
and Class B Certificates  pro rata based  on the interest  accrued on each  such
Class  and among the Subclasses of Class A Certificates or Class B Certificates,
as the case may be, pro rata on  the basis of their respective Class A  Subclass
Interest  Accrual Amount or  Class B Subclass  Interest Accrual Amounts, without
regard to any reduction
 
                                      S-43
<PAGE>
pursuant to this paragraph, for such Distribution Date. Any amount allocated  to
the  Class A-12 Certificates  will be allocated among  the Class A-12 Components
(other than  the  Class A-12  PO  Component) pro  rata  on the  basis  of  their
respective  Component Interest Accrual Amounts,  without regard to any reduction
pursuant to this paragraph, for such Distribution Date.
 
    Allocations of the interest  portion of Realized  Losses (other than  Excess
Special Hazard Losses, Excess Fraud Losses or Excess Bankruptcy Losses) first to
the  Subclasses of Class B  Certificates in reverse numerical  order and then to
the Class M Certificates will result from the priority of distributions first to
the holders of the Class  A Certificates, second to the  holders of the Class  M
Certificates and finally to holders of the Subclasses of Class B Certificates in
numerical  order  of  the  Pool Distribution  Amount  as  described  above under
"Description of the Certificates -- Distributions."
 
    On each Distribution Date  on which the Pool  Distribution Amount equals  or
exceeds  the sum of the Class A Subclass Interest Accrual Amounts, distributions
in respect of interest to each Subclass of Class A Certificates will equal  such
Subclass's  Class A Subclass Interest Accrual Amount. On each Distribution Date,
interest in an amount equal to the Class A Subclass Interest Accrual Amount  and
the  Component Interest  Accrual Amount of  the Class A-11  Certificates and the
Class A-12 TAC Accrual  Component, respectively, will  accrue thereon, but  such
amount  will not  be distributed  as interest  to the  Class A-11  or Class A-12
Certificates with respect to  the Class A-12 TAC  Accrual Component until  their
respective  Accretion Termination Dates. Prior to  such time, an amount equal to
the Class A Subclass Interest Accrual Amount for the Class A-11 Certificates and
the Component Interest Accrual Amount for  the Class A-12 TAC Accrual  Component
will  instead  be distributed  in reduction  of the  Class A  Subclass Principal
Balances of the Accretion Directed Certificates and the Class A-11  Certificates
and  the Component Principal Balance of the Class A-12 TAC Accrual Component, as
described under "-- Principal (Including  Prepayments)  -- Allocation of  Amount
to  be Distributed" below,  and the Class  A Subclass Principal  Balance and the
Component Principal Balance of  the Class A-11 Certificates  and the Class  A-12
TAC  Accrual  Component, as  applicable, will  be  increased by  a corresponding
amount. The "Class A-11 Accretion Termination Date" will be the earlier to occur
of (i) the Distribution Date following the Distribution Date on which the  Class
A  Subclass Principal Balance of the Class A-13 Certificates has been reduced to
zero or  (ii)  the  Cross-Over  Date. The  "Class  A-12  TAC  Accrual  Component
Accretion Termination Date" will be the earlier to occur 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. The Class  A-11 Accretion Termination Date  and the Class A-12
TAC  Accrual  Component  Accretion  Termination  Date  are  referred  to  herein
collectively as the "Accretion Termination Dates."
 
    If,  on any Distribution Date, the Pool Distribution Amount is less than the
sum of the  Class A Subclass  Interest Accrual Amounts,  the amount of  interest
currently   distributed  on  the  Class  A  Certificates  will  equal  the  Pool
Distribution Amount  and will  be  allocated among  the  Subclasses of  Class  A
Certificates  pro rata in accordance with  each such Subclass's Class A Subclass
Interest Accrual Amount. Amounts so allocated will be distributed in respect  of
interest  to each  Subclass of  Class A Certificates  with the  exception of the
Class A-11 Certificates  and the  Class A-12  Certificates with  respect to  the
Class A-12 TAC Accrual Component prior to their respective Accretion Termination
Dates. In the case of the Class A-11 Certificates and the Class A-12 TAC Accrual
Component  prior  to their  respective Accretion  Termination Dates,  amounts so
allocated will be added to the Class  A Subclass Principal Balance of the  Class
A-11  Certificates  or the  Component Principal  Balance of  the Class  A-12 TAC
Accrual Component,  as applicable,  and distributed  to the  Accretion  Directed
Certificates,  the  Class  A-11  Certificates and  the  Class  A-12  TAC Accrual
Component as described under " -- Principal (Including
Prepayments) -- Allocation of  Amount to be  Distributed" below. Any  difference
between  the portion of  the Pool Distribution Amount  distributed in respect of
current interest to each Subclass of Class A Certificates or, in the case of the
Class A-11 Certificates  and the  Class A-12  Certificates with  respect to  the
Class A-12 TAC Accrual Component prior to their respective Accretion Termination
Dates,  accrued  on and  added  to the  Class  A Subclass  Principal  Balance or
Component Principal Balance thereof, and  the Class A Subclass Interest  Accrual
Amount  for such Subclass with  respect to the related  Distribution Date (as to
each Subclass, the "Class A Subclass Interest Shortfall
 
                                      S-44
<PAGE>
Amount")  will  be  added  to  the  amount  to  be  distributed  on   subsequent
Distribution  Dates to such Subclass, but only  so long as it is outstanding, to
the extent that the Pool Distribution Amount is sufficient therefor. The Class A
Subclass Interest Shortfall Amount of  the Class A-12 Certificates with  respect
to  any Distribution Date  will be allocated  among the Components  of the Class
A-12 Certificates  (other than  the  Class A-12  PO  Component) based  on  their
Component  Interest Accrual Amounts (such shortfall  allocated to any Class A-12
Component, the "Component Interest Shortfall  Amount"). No interest will  accrue
on  the unpaid Class A Subclass Interest Shortfall Amounts. In the event that on
any Distribution Date prior to the Accretion Termination Date for the Class A-11
Certificates or  the Class  A-12 TAC  Accrual Component,  the Pool  Distribution
Amount  is less than the  sum of the Class  A Subclass Interest Accrual Amounts,
resulting in Class A Subclass Interest Shortfall Amounts, as described above, an
amount equal to the Class A-11 Accrual Distribution Amount or the Class A-12 TAC
Accrual Component Distribution Amount, as applicable would be distributed to the
Accretion Directed Certificates, the Class A-11 Certificates and the Class  A-12
TAC  Accrual Component in reduction of their Class A Subclass Principal Balances
and Component Principal Balance, notwithstanding that the holders of the Class A
Certificates of  the  Subclasses  then  entitled  to  receive  distributions  of
interest  have received  less than  their respective  Class A  Subclass Interest
Accrual Amounts with respect to such Distribution Date.
 
    On each Distribution Date on which the Pool Distribution Amount exceeds  the
sum  of the Class A  Subclass Interest Accrual Amounts,  any excess will then be
allocated first to  pay previously  unpaid Class A  Subclass Interest  Shortfall
Amounts.  Such  amounts  will  be  allocated among  the  Subclasses  of  Class A
Certificates pro  rata  in  accordance  with their  respective  unpaid  Class  A
Subclass Interest Shortfall Amounts immediately prior to such Distribution Date.
Any  amount allocated to the Class A-12 Certificates will be allocated among the
Components of  the  Class  A-12  Certificates (other  than  the  Class  A-12  PO
Component)  based on their unpaid Component Interest Shortfall Amounts. Prior to
their respective Accretion  Termination Dates,  the amount so  allocated to  the
Class  A-11  Certificates  or  Class  A-12 TAC  Accrual  Component  will  not be
distributed as interest  to the holders  of the Class  A-11 Certificates or  the
Class  A-12 Certificates,  but instead will  be distributed in  reduction of the
Class A Subclass Principal Balances  of the Accretion Directed Certificates  and
the  Class A-11  Certificates and the  Component Principal Balance  of the Class
A-12 TAC Accrual Component,  and the Class A  Subclass Principal Balance of  the
Class  A-11 Certificates and  the Component Principal Balance  of the Class A-12
TAC Accrual  Component, as  applicable,  will be  increased by  a  corresponding
amount.
 
    On  each Distribution Date  on which the Pool  Distribution Amount equals or
exceeds the sum for such Distribution Date of (A) the sum of (i) the sum of  the
Class  A Subclass  Interest Accrual  Amounts with  respect to  the Subclasses of
Class A  Certificates, (ii)  the sum  of the  unpaid Class  A Subclass  Interest
Shortfall  Amounts with  respect to the  Subclasses of Class  A Certificates and
(iii) the Class A Non-PO Optimal Principal Amount (collectively with the amounts
described in clauses (i) and (ii), the "Class A Non-PO Optimal Amount"), (B) the
Class A-12 PO Optimal Principal  Amount (collectively with the amount  described
in  clause  (A), the  "Class A  Optimal Amount")  and (C)  the Class  M Interest
Accrual Amount, distributions  in respect  of current  interest to  the Class  M
Certificates will equal the Class M Interest Accrual Amount.
 
    If,  on any Distribution Date, the Pool Distribution Amount is less than the
sum of (i)  the Class A  Optimal Amount and  (ii) the Class  M Interest  Accrual
Amount,  the amount of current interest  distributed on the Class M Certificates
will equal the  Pool Distribution Amount  minus the amounts  distributed to  the
Class  A Certificates  with respect  to such  Distribution Date.  Any difference
between the portion of  the Pool Distribution Amount  distributed in respect  of
current  interest to the Class  M Certificates and the  Class M Interest Accrual
Amount with respect to such Distribution  Date (the "Class M Interest  Shortfall
Amount")   will  be  added  to  the  amount  to  be  distributed  on  subsequent
Distribution Dates to the  Class M Certificates,  but only so  long as they  are
outstanding,  to  the extent  that the  Pool  Distribution Amount  is sufficient
therefor. No  interest will  accrue on  the unpaid  Class M  Interest  Shortfall
Amount.
 
                                      S-45
<PAGE>
    Subject  to the payment of  any Class A-12 PO  Component Deferred Amount, on
each Distribution Date on which the Pool Distribution Amount exceeds the sum  of
the  Class A Optimal Amount and the  Class M Interest Accrual Amount, any excess
will be allocated  first to  pay previously  unpaid Class  M Interest  Shortfall
Amounts  and then to make  distributions in respect of  principal on the Class M
Certificates. With  respect to  each  Distribution Date,  the "Class  M  Optimal
Amount"  will equal the sum of (i) the Class M Interest Accrual Amount, (ii) the
unpaid Class M Interest Shortfall Amount and (iii) the Class M Optimal Principal
Amount.
 
    Each Distribution  Date on  which  the Pool  Distribution Amount  equals  or
exceeds  the  sum of  (i) the  Class B  Subclass Interest  Accrual Amount  for a
particular Subclass  of Class  B Certificates  and (ii)  all amounts  senior  in
priority  to such Class B  Subclass Interest Accrual Amount  as set forth in the
Pool Distribution  Amount Allocation,  the distribution  in respect  of  current
interest  to such  Subclass of Class  B Certificates will  equal such Subclass's
Class B Subclass Interest Accrual Amount.
 
    If on any Distribution Date, the  Pool Distribution Amount is less than  the
sum  of  (i) the  Class  B Subclass  Interest  Accrual Amount  for  a particular
Subclass of Class B Certificates and (ii) all amounts senior in priority to such
Class B Subclass  Interest Accrual Amount  based on the  priorities in the  Pool
Distribution  Amount Allocation, the  amount of current  interest distributed on
such Subclass of Class  B Certificates will equal  the Pool Distribution  Amount
less  all amounts senior in  priority to such Class  B Subclass Interest Accrual
Amount as set forth in the  Pool Distribution Amount Allocation. Any  difference
between  the amount distributed in respect  of current interest to such Subclass
of Class B  Certificates and the  Class B Subclass  Interest Accrual Amount  for
such  Subclass  with  respect  to  the related  Distribution  Date  (as  to such
Subclass, the "Class B Subclass Interest Shortfall Amount") will be added to the
amount to be distributed on subsequent Distribution Dates to the extent the Pool
Distribution Amount  is sufficient  therefor. No  interest will  accrue on  such
Class B Subclass Interest Shortfall Amount.
 
    For a particular Subclass of Class B Certificates, subject to the payment of
any  Class A-12 PO Component Deferred Amount, on each Distribution Date on which
the Pool Distribution Amount exceeds the sum of the Class A Optimal Amount,  the
Class M Optimal Amount, the Subclass B Optimal Amount for each Subclass of Class
B  Certificates  with a  lower numerical  designation and  the Class  B Subclass
Interest Accrual Amount for such Subclass, any excess will be allocated first to
pay previously  unpaid  Class B  Subclass  Interest Shortfall  Amounts  of  such
Subclass  and  then  to  make  distributions in  respect  of  principal  on such
Subclass. With  respect  to each  Distribution  Date, the  "Subclass  B  Optimal
Amount"  for any Subclass of Class B Certificates  will equal the sum of (i) the
Class B  Subclass Interest  Accrual Amount,  (ii) the  unpaid Class  B  Subclass
Interest Shortfall Amounts and (iii) the Subclass B Optimal Principal Amount.
 
    On  any Distribution Date on which the Pool Distribution Amount is less than
the Class A Optimal Amount, the Class M Certificates and the Subclasses of Class
B Certificates  will  not  be  entitled to  any  distributions  of  interest  or
principal.
 
PRINCIPAL (INCLUDING PREPAYMENTS)
 
    The principal balance of a Class A or Class B Certificate of any Subclass or
of  any Class M Certificate at  any time is equal to  the product of the Class A
Subclass Principal  Balance  or  Class  B Subclass  Principal  Balance  of  such
Subclass  or  the  Class M  Principal  Balance, as  the  case may  be,  and such
Certificate's Percentage Interest, and  represents the maximum specified  dollar
amount  (exclusive  of  (i)  any  interest  that  may  accrue  on  such  Class A
Certificate (other than interest added to the Class A Subclass Principal Balance
of the Class A-11 Certificates or  the Component Principal Balance of the  Class
A-12 TAC Accrual Component, as the case maybe), such Class M Certificate or such
Class  B  Certificate and  (ii) in  the case  of  the Class  A-R and  Class A-LR
Certificate, any additional amounts to which the holder of such Certificate  may
be entitled as described below under "--  Additional Rights of the Class A-R and
Class  A-LR Certificateholder") to which the holder thereof is entitled from the
cash flow on the Mortgage Loans at such time, and will decline to the extent  of
distributions  in  reduction of  the principal  balance  of, and  allocations of
losses to, such Certificate. The
 
                                      S-46
<PAGE>
approximate initial  Class A  Subclass  Principal Balance  or Class  B  Subclass
Principal   Balance  of  each  Subclass  of  Class  A  (other  than  Class  A-12
Certificates) and Offered Class B Certificates and the approximate initial Class
M Principal Balance are  set forth on the  cover of this Prospectus  Supplement.
The  approximate inital  Class A  Subclass Principal  Balance of  the Class A-12
Certificates is expected to be approximately $34,374,653.
 
    CALCULATION OF AMOUNT TO BE DISTRIBUTED TO THE CLASS A CERTIFICATES
 
    Distributions  in  reduction  of  the  principal  balance  of  the  Class  A
Certificates  (other than the Class A-12  Certificates with respect to the Class
A-12 PO Component) will be made  on each Distribution Date pursuant to  priority
THIRD  clause (A)  of the Pool  Distribution Amount Allocation,  in an aggregate
amount equal to the Class A  Non-PO Principal Distribution Amount. The "Class  A
Non-PO Principal Distribution Amount" with respect to any Distribution Date will
be  equal to the sum of (i) the  Class A-11 Accrual Distribution Amount, if any,
with respect  to  such  Distribution  Date, (ii)  the  Class  A-12  TAC  Accrual
Component  Distribution Amount, if  any, with respect  to such Distribution Date
and (iii) the Class A Non-PO Principal Amount with respect to such  Distribution
Date.
 
    The   "Class  A-11  Accrual   Distribution  Amount"  with   respect  to  any
Distribution Date  will be  equal to  the sum  of (i)  the portion,  if any,  of
current  interest allocated but  not distributed with respect  to the Class A-11
Certificates on such Distribution Date in accordance with priority FIRST of  the
Pool  Distribution Amount Allocation and (ii) the portion, if any, of the unpaid
Class A Interest Shortfall Amount allocated but not distributed with respect  to
the  Class  A-11  Certificates  on such  Distribution  Date  in  accordance with
priority SECOND of the Pool Distribution Amount Allocation.
 
    The "Class A-12 TAC Accrual  Component Distribution Amount" with respect  to
any  Distribution Date will be equal  to the sum of (i)  the portion, if any, of
current interest allocated but  not distributed with respect  to the Class  A-12
TAC  Accrual Component  on such  Distribution Date  in accordance  with priority
FIRST of the Pool Distribution Amount  Allocation and (ii) the portion, if  any,
of  the unpaid Class  A Interest Shortfall Amount  allocated but not distributed
with respect to the Class A-12  TAC Accrual Component on such Distribution  Date
in accordance with priority SECOND of the Pool Distribution Amount Allocation.
 
    The  "Class A Non-PO Principal Amount" with respect to any Distribution Date
will be equal to the amount distributed pursuant to priority THIRD clause (A) of
the Pool Distribution Amount Allocation, in an aggregate amount up to the  Class
A Non-PO Optimal Principal Amount.
 
    The  "Class  A  Non-PO  Optimal  Principal  Amount"  with  respect  to  each
Distribution Date  will be  an amount  equal  to 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:
 
    (i) the Class A Percentage of (A) the scheduled payment of principal due  on
        such  Mortgage  Loan  on  the  first  day  of  the  month  in  which the
        Distribution Date  occurs, less  (B) if  the Bankruptcy  Loss Amount  is
        zero,  the principal portion of Debt  Service Reductions 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  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, as described under the
         heading "Description of the Mortgage  Loans -- Mandatory Repurchase  or
         Substitution of Mortgage Loans" herein, and
 
   (iv) the  Class A Percentage of the excess of the unpaid principal balance of
        any defective Mortgage Loan  for which a  Mortgage Loan was  substituted
        during  the month  preceding the month  in which  such Distribution Date
        occurs over the unpaid principal balance of such
 
                                      S-47
<PAGE>
        substituted Mortgage Loan,  less the amount  allocable to the  principal
        portion  of  any  unreimbursed  advances in  respect  of  such defective
        Mortgage Loan. See "The Pooling and Servicing Agreement -- Assignment of
        the Mortgage Loans to the Trustee" in the Prospectus.
 
    In addition, in the event that there is any recovery of an amount in respect
of principal which had previously been allocated as a Realized Loss to the Class
A Certificates,  each Subclass  of Class  A  Certificates, for  so long  as  its
principal balance has not been reduced to zero, will be entitled to its pro rata
share  of such  recovery in  an amount  up to  the amount  by which  the Class A
Subclass Principal Balance  of such  Subclass was reduced  as a  result of  such
Realized Loss.
 
    The  "Non-PO Fraction" with respect to any  Mortgage Loan will equal the Net
Mortgage Interest Rate for such Mortgage Loan divided by 7.75%.
 
    The "Scheduled Principal Balance" of a Mortgage Loan as of any  Distribution
Date  is the unpaid principal balance of  such Mortgage Loan as specified in the
amortization schedule at  the time  relating thereto (before  any adjustment  to
such  schedule  by  reason  of  bankruptcy  (other  than  Deficient Valuations),
moratorium or similar waiver or  grace period) as of  the Due Date occurring  in
the  month preceding  the month  in which  such Distribution  Date occurs, after
giving effect to any  principal prepayments or  other unscheduled recoveries  of
principal   previously  received,  to  any  partial  principal  prepayments  and
Deficient Valuations  occurring  prior to  such  Due  Date, to  the  payment  of
principal due on such Due Date irrespective of any delinquency in payment by the
mortgagor  and to any Unscheduled Principal  Receipts received or applied during
the applicable Unscheduled Principal Receipt Period for the Distribution Date in
the month preceding such Distribution Date.
 
    A "Realized Loss" is any Liquidated Loan Loss (including any Special  Hazard
Loss  and  any Fraud  Loss) or  any Bankruptcy  Loss. A  "Liquidated Loan"  is a
defaulted Mortgage  Loan  as to  which  the  Servicer has  determined  that  all
recoverable liquidation and insurance proceeds have been received. A "Liquidated
Loan  Loss" on  a Liquidated Loan  is equal  to the excess,  if any,  of (i) the
unpaid principal balance of such Liquidated Loan, plus accrued interest  thereon
in  accordance with the amortization schedule  at the Net Mortgage Interest Rate
through the last day of  the month in which  such Mortgage Loan was  liquidated,
over  (ii) net Liquidation  Proceeds. For purposes of  calculating the amount of
any Liquidated Loan Loss, all  net Liquidation Proceeds (after reimbursement  of
any  previously unreimbursed Periodic Advance) will  be applied first to accrued
interest and then  to the  unpaid principal balance  of the  Liquidated Loan.  A
"Special  Hazard Loss"  is (A)  a Liquidated Loan  Loss suffered  by a Mortgaged
Property on account of direct physical loss exclusive of (i) any loss covered by
a standard hazard insurance policy or,  if the Mortgaged Property is located  in
an  area identified in the Federal  Register by the Federal Emergency Management
Agency as having special flood hazards,  a flood insurance policy, of the  types
described  in  the Prospectus  under  "The Trust  Estates  -- Mortgage  Loans --
Insurance Policies" and  (ii) any loss  caused by or  resulting from (a)  normal
wear  and tear, (b)  dishonest acts of  the Trustee, the  Master Servicer or the
Servicer or (c) errors in design, faulty workmanship or faulty materials, unless
the collapse of the property or a  part thereof ensues or (B) a Liquidated  Loan
Loss arising from or relating to the presence or suspected presence of hazardous
wastes  or substances on  a Mortgaged Property.  A "Fraud Loss"  is a Liquidated
Loan Loss incurred  on a  Liquidated Loan  as to which  there was  fraud in  the
origination of such Mortgage Loan. A "Bankruptcy Loss" is a loss attributable to
certain  actions which may be  taken by a bankruptcy  court in connection with a
Mortgage Loan, including  a reduction  by a  bankruptcy court  of the  principal
balance  of or  the interest  rate on  a Mortgage  Loan or  an extension  of its
maturity. A "Debt Service Reduction" means a reduction in the amount of  monthly
payments  due  to  certain  bankruptcy proceedings,  but  does  not  include any
permanent forgiveness of principal.  A "Deficient Valuation"  with respect to  a
Mortgage  Loan means  a valuation  by a  court of  the Mortgaged  Property in an
amount less than  the outstanding indebtedness  under the Mortgage  Loan or  any
reduction  in  the  amount  of  monthly payments  that  results  in  a permanent
forgiveness of principal, which valuation or reduction results from a bankruptcy
proceeding.
 
    The "Class A Percentage" for any Distribution Date occurring on or prior  to
the  Cross-Over Date is the percentage (subject  to rounding), which in no event
will exceed 100%, obtained by dividing  the Class A Non-PO Principal Balance  as
of    such    date    (before    taking    into    account    distributions   in
 
                                      S-48
<PAGE>
reduction of  principal  balance on  such  date)  by the  Pool  Balance  (Non-PO
Portion).  The "Pool Balance  (Non-PO Portion)" is the  sum for each 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 as  of such
Distribution Date. The Class A Percentage  for the first Distribution Date  will
be approximately 93.92%. The Class A Percentage will decrease as a result of the
allocation  of certain unscheduled payments in respect of principal according to
the Class  A  Prepayment  Percentage for  a  specified  period to  the  Class  A
Certificates  (other than the Class A-12  Certificates with respect to the Class
A-12 PO Component) and will increase as  a result of the allocation of  Realized
Losses  to the Class M and Class B Certificates. The Class A Percentage for each
Distribution Date occurring after the Cross-Over Date will be 100%.
 
    The "Class A Prepayment  Percentage" for any Distribution  Date will be  the
percentage indicated below:
 
<TABLE>
<CAPTION>
DISTRIBUTION DATE OCCURRING IN                                     CLASS A PREPAYMENT PERCENTAGE
- -----------------------------------------------  -----------------------------------------------------------------
<S>                                              <C>
September 1996 through August 2001.............  100%;
September 2001 through August 2002.............  the Class A Percentage, plus 70% of the Subordinated Percentage;
September 2002 through August 2003.............  the Class A Percentage, plus 60% of the Subordinated Percentage;
September 2003 through August 2004.............  the Class A Percentage, plus 40% of the Subordinated Percentage;
September 2004 through August 2005.............  the Class A Percentage, plus 20% of the Subordinated Percentage;
                                                  and
September 2005 and thereafter..................  the Class A Percentage;
</TABLE>
 
    PROVIDED,  HOWEVER, that if  on any of the  foregoing Distribution Dates the
Class A  Percentage  exceeds  the  initial  Class  A  Percentage,  the  Class  A
Prepayment Percentage for such Distribution Date will once again equal 100%. See
"Prepayment   and   Yield  Considerations"   herein   and  in   the  Prospectus.
Notwithstanding the foregoing, no reduction of the Class A Prepayment Percentage
will occur on any Distribution  Date if (i) as of  such Distribution Date as  to
which  any such reduction applies, 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 Mortgage Loans in foreclosure and  Mortgage Loans with respect to which  the
related  Mortgaged Property  has been acquired  by the Trust  Estate) is greater
than or  equal to  50% of  the sum  of the  then-outstanding Class  M  Principal
Balance  and the  then-outstanding Class  B Principal  Balance, or  (ii) for any
Distribution Date, cumulative Realized Losses with respect to the Mortgage Loans
exceed the percentages of the principal balance of the Subordinated Certificates
as of the Cut-Off Date (the "Original Subordinated Principal Balance") indicated
below:
 
<TABLE>
<CAPTION>
                                                                                          PERCENTAGE OF ORIGINAL
DISTRIBUTION DATE OCCURRING IN                                                        SUBORDINATED PRINCIPAL BALANCE
- -----------------------------------------------------------------------------------  ---------------------------------
<S>                                                                                  <C>
September 2001 through August 2002.................................................                    30%
September 2002 through August 2003.................................................                    35%
September 2003 through August 2004.................................................                    40%
September 2004 through August 2005.................................................                    45%
September 2005 and thereafter......................................................                    50%
</TABLE>
 
    This disproportionate allocation of certain unscheduled payments in  respect
of  principal will have the effect of accelerating the amortization of the Class
A Certificates (other than the Class A-12 Certificates with respect to the Class
A-12 PO Component)  while, in  the absence  of Realized  Losses, increasing  the
interest in the principal balance of the Mortgage Loans evidenced by the Class M
and  Class B Certificates. Increasing the respective interest of the Class M and
Class B Certificates relative  to that of the  Class A Certificates (other  than
the  Class A-12  Certificates with  respect to the  Class A-12  PO Component) is
intended to preserve the availability of the subordination provided by the Class
M and  Class B  Certificates.  See "--  Subordination of  Class  M and  Class  B
Certificates"  below. The  "Subordinated Percentage"  for any  Distribution Date
will be calculated as the difference between 100% and the Class A Percentage for
such date. The "Subordinated Prepayment Percentage" for any
 
                                      S-49
<PAGE>
Distribution Date will  be calculated  as the  difference between  100% and  the
Class  A Prepayment Percentage  for such date.  If on any  Distribution Date the
allocation to the Class A Certificates of full and partial principal prepayments
and other amounts in the percentage required above would reduce the  outstanding
Class  A Non-PO Principal Balance below  zero, the Class A Prepayment Percentage
for such Distribution Date will be limited to the percentage necessary to reduce
the Class A Non-PO Principal Balance to zero.
 
    CALCULATION OF AMOUNT TO BE DISTRIBUTED TO THE CLASS A-12 PO COMPONENT
 
    Distributions in reduction of the  Component Principal Balance of the  Class
A-12  PO Component will be made on each Distribution Date in an aggregate amount
equal to the  Class A-12 PO  Component Distribution Amount.  The "Class A-12  PO
Component  Distribution Amount"  with respect to  any Distribution  Date will be
equal to the sum of (i) the amount distributed pursuant to priority THIRD clause
(B) of the Pool Distribution Amount Allocation, in an aggregate amount up to the
Class A-12 PO Component Optimal Principal Amount and (ii) the amount distributed
pursuant to priority FOURTH  of the Pool Distribution  Amount Allocation, in  an
aggregate amount up to the Class A-12 PO Component Deferred Amount.
 
    The  "Class A-12 PO Component Optimal Principal Amount" with respect to each
Distribution Date  will be  an amount  equal  to 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 PO Fraction for such Mortgage Loan
and (B) the sum of:
 
    (i) the scheduled payment  of principal  due on  such Mortgage  Loan on  the
        first  day of the month in which  the Distribution Date occurs, less, if
        the Bankruptcy  Loss  Amount is  zero,  the principal  portion  of  Debt
        Service Reductions 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 Unscheduled  Principal
         Receipt  Period relating to such  Distribution Date for each applicable
         type of Unscheduled Principal Receipt,
 
   (iii) the Scheduled Principal Balance of such Mortgage Loan which, during the
         month preceding the month of such Distribution Date was repurchased  by
         the Seller, as described under the heading "Description of the Mortgage
         Loans  --  Mandatory  Repurchase  or  Substitution  of  Mortgage Loans"
         herein, and
 
   (iv) the excess of  the unpaid  principal balance of  any defective  Mortgage
        Loan  for  which  a  Mortgage  Loan  was  substituted  during  the month
        preceding the  month in  which such  Distribution Date  occurs over  the
        unpaid  principal balance  of such  substituted Mortgage  Loan, less the
        amount allocable to the principal  portion of any unreimbursed  advances
        in  respect  of  such  defective Mortgage  Loan.  See  "The  Pooling and
        Servicing Agreement -- Assignment of  Mortgage Loans to the Trustee"  in
        the Prospectus.
 
    The  "Class A-12  PO Component  Deferred Amount"  for any  Distribution Date
prior to the Cross-Over Date  will equal the difference  between (A) the sum  of
(i) the amount by which the Class A-12 PO Component Optimal Principal Amount for
all  prior Distribution Dates exceeds the  amounts distributed to the Class A-12
Certificates  in  respect  of  the  Class  A-12  PO  Component  on  such   prior
Distribution   Dates  pursuant  to  priority  THIRD,  clause  (B)  of  the  Pool
Distribution Amount Allocation,  but only to  the extent such  shortfall is  not
attributable  to Realized  Losses allocated  to the  Class A-12  PO Component as
described in "-- Subordination of Class M and Class B Certificates -- Allocation
of Losses" below and (ii) 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 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 Discount Mortgage Loan  other
than  Excess Special  Hazard Losses, Excess  Fraud Losses  and Excess Bankruptcy
Losses and  (B) amounts  distributed on  the Class  A-12 PO  Component on  prior
Distribution    Dates    pursuant    to   priority    FOURTH    of    the   Pool
 
                                      S-50
<PAGE>
Distribution Amount Allocation. On or after the Cross-Over Date, the Class  A-12
PO  Component Deferred Amount will be zero. No interest will accrue on any Class
A-12 PO Component Deferred Amount.
 
    The "PO Fraction" with respect to any Discount Mortgage Loan will equal  the
difference  between 1.0 and the  Non-PO Fraction for such  Mortgage Loan. The PO
Fraction with respect to each Mortgage Loan that is not a Discount Mortgage Loan
will be zero.
 
    The "Pool Balance (PO Portion)" is  the sum for each Discount Mortgage  Loan
of the product of the Scheduled Principal Balance of such Discount Mortgage Loan
and the PO Fraction for such Discount Mortgage Loan.
 
    CALCULATION OF AMOUNT TO BE DISTRIBUTED TO THE CLASS M AND CLASS B
    CERTIFICATES
 
    Distributions  in  reduction  of  the  principal  balance  of  the  Class  M
Certificates will  be  made on  each  Distribution Date,  pursuant  to  priority
SEVENTH  of the Pool Distribution Amount Allocation, in an aggregate amount (the
"Class M Principal  Distribution Amount") up  to the Class  M Optimal  Principal
Amount.
 
    The  "Class M  Optimal Principal Amount"  with respect  to each Distribution
Date will be  an amount  equal to  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:
 
    (i) the  Class M Percentage of (A) the scheduled payment of principal due on
        such Mortgage  Loan  on  the  first  day  of  the  month  in  which  the
        Distribution  Date occurs,  less (B)  if the  Bankruptcy Loss  Amount is
        zero, the principal portion of  Debt Service Reductions 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  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, as described under the
         heading  "Description of the Mortgage  Loans -- Mandatory Repurchase or
         Substitution of Mortgage Loans" herein, and
 
   (iv) the Class M Percentage of the excess of the unpaid principal balance  of
        any  defective Mortgage Loan  for which a  Mortgage Loan was substituted
        during the month  preceding the  month in which  such Distribution  Date
        occurs  over the unpaid  principal balance of  such substituted Mortgage
        Loan, less  the  amount  allocable  to  the  principal  portion  of  any
        unreimbursed  advances in respect  of such defective  Mortgage Loan. See
        "The Pooling and Servicing Agreement -- Assignment of the Mortgage Loans
        to the Trustee" in the Prospectus.
 
    Distributions in reduction of  the principal balances of  the Class B-1  and
Class  B-2  Certificates will  be made  on each  Distribution Date,  pursuant to
priorities TENTH and THIRTEENTH, respectively,  of the Pool Distribution  Amount
Allocation,  in  an aggregate  amount with  respect to  each such  Subclass (the
"Class B-1 Principal Distribution Amount" and "Class B-2 Principal  Distribution
Amount,"  respectively) up to  the Subclass B Optimal  Principal Amount for such
Subclass.
 
    The "Subclass B Optimal Principal Amount" for a particular Subclass of Class
B Certificates with respect to each Distribution Date will be an amount equal to
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:
 
                                      S-51
<PAGE>
    (i) the Subclass B Percentage for such Subclass of (A) the scheduled payment
        of principal due on such Mortgage Loan on the first day of the month  in
        which  the Distribution  Date occurs,  less (B)  if the  Bankruptcy Loss
        Amount is zero, the  principal portion of  Debt Service Reductions  with
        respect to such Mortgage Loan,
 
    (ii) the   Subclass  B  Prepayment  Percentage  for  such  Subclass  of  all
         Unscheduled Principal Receipts  that were received  by a Servicer  with
         respect  to such Mortgage Loan during the Unscheduled Principal Receipt
         Period relating to such Distribution  Date for each applicable type  of
         Unscheduled Principal Receipt,
 
   (iii) the Subclass B Prepayment Percentage for such Subclass 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,  as described  under the  heading "Description  of the Mortgage
         Loans --  Mandatory  Repurchase  or  Substitution  of  Mortgage  Loans"
         herein, and
 
   (iv) the  Subclass B Percentage for such Subclass of the excess of the unpaid
        principal balance of any  defective Mortgage Loan  for which a  Mortgage
        Loan  was substituted during the month preceding the month in which such
        Distribution Date  occurs  over the  unpaid  principal balance  of  such
        substituted  Mortgage Loan, less  the amount allocable  to the principal
        portion of  any  unreimbursed  advances in  respect  of  such  defective
        Mortgage Loan. See "The Pooling and Servicing Agreement -- Assignment of
        the Mortgage Loans to the Trustee" in the Prospectus.
 
    The  principal  distribution to  the holders  of Class  M Certificates  or a
Subclass of Class  B Certificates will  be reduced on  any Distribution Date  on
which  (i) the principal balance of the Class M Certificates or such Subclass of
Class B Certificates  on the following  Determination Date would  be reduced  to
zero as a result of principal distributions or allocation of losses and (ii) the
principal  balance of any Class A Certificates, and in the case of a Subclass of
Class B Certificates, the principal balances of the Class M Certificates or  any
Subclass  of Class B  Certificates with a lower  numerical designation, would be
subject to reduction  on such Determination  Date as a  result of allocation  of
Realized  Losses (other than  Excess Bankruptcy Losses,  Excess Fraud Losses and
Excess Special Hazard Losses). The amount of any such reduction in the principal
distributed to the holders of Class M  Certificates or such Subclass of Class  B
Certificates will instead be distributed pro rata to the holders of any Subclass
(other  than  the Class  A-12 Certificates  with  respect to  the Class  A-12 PO
Component) and Class senior in  priority to receive distributions in  accordance
with the Pool Distribution Amount Allocation.
 
    In addition, in the event that there is any recovery of an amount in respect
of principal which had previously been allocated as a Realized Loss to the Class
M Certificates or any Subclass of Class B Certificates, the Class M Certificates
or such Subclass, for so long as the principal balance of such Class or Subclass
has  not been reduced to zero, will be  entitled to their pro rata share of such
recovery up to  the amount by  which the Class  M Principal Balance  or Class  B
Subclass Principal Balance was reduced as a result of such Realized Loss.
 
    The  "Class  M  Percentage"  and "Class  M  Prepayment  Percentage"  for any
Distribution Date will  equal that  portion of the  Subordinated Percentage  and
Subordinated  Prepayment  Percentage, as  the case  may  be, represented  by the
fraction the  numerator  of which  is  the then-outstanding  Class  M  Principal
Balance and the denominator of which is the sum of the Class M Principal Balance
and,  if  any of  the Subclasses  of the  Class B  Certificates are  entitled to
principal distributions for such Distribution Date as described below, the Class
B  Subclass  Principal  Balances  of   the  Subclasses  entitled  to   principal
distributions.
 
    The  "Subclass B  Percentage" and "Subclass  B Prepayment  Percentage" for a
Subclass of Class  B Certificates  will equal  the portion  of the  Subordinated
Percentage   and  Subordinated  Prepayment  Percentage,  as  the  case  may  be,
represented by  the fraction,  the numerator  of which  is the  then-outstanding
Class B Subclass Principal Balance for such Subclass of Class B Certificates and
the  denominator of which  is the sum of  the Class M  Principal Balance and the
Class B  Subclass Principal  Balances of  the Subclasses  entitled to  principal
distributions for such Distribution Date as described
 
                                      S-52
<PAGE>
below.  In the event that a Subclass of  Class B Certificates is not entitled to
principal distributions for  such Distribution Date,  the Subclass B  Percentage
and  Subclass B  Prepayment Percentage  for such Subclass  will both  be 0% with
respect to such Distribution Date.
 
    In the event that on any  Distribution Date, the Current Class M  Fractional
Interest  is less than the Original Class  M Fractional Interest, then the Class
B-1, Class B-2,  Class B-3, Class  B-4 and  Class B-5 Certificates  will not  be
entitled  to  distributions in  respect of  principal and  the Class  B Subclass
Principal Balances thereof will not be used to determine the Class M  Percentage
and  Class  M  Prepayment  Percentage  for  such  Distribution  Date.  For  such
Distribution Date, the Class M Percentage and Class M Prepayment Percentage will
equal the Subordinated  Percentage and the  Subordinated Prepayment  Percentage,
respectively.  In the event that the  Current Class M Fractional Interest equals
or exceeds the Original  Class M Fractional Interest  but the Current Class  B-1
Fractional Interest is less than the Original Class B-1 Fractional Interest, the
Class  B-2, Class B-3, Class B-4 and Class B-5 Certificates will not be entitled
to distributions in  respect of  principal and  the Class  B Subclass  Principal
Balances  of  such  Subclasses  will  not  be  used  to  determine  the  Class M
Percentage, the Class M Prepayment Percentage, the Subclass B Percentage for the
Class B-1 Certificates and  the Subclass B Prepayment  Percentage for the  Class
B-1  Certificates for  such Distribution  Date. In  the event  that each  of the
Current Class  M  Fractional  Interest  and the  Current  Class  B-1  Fractional
Interest  equals or  exceeds the  Original Class  M Fractional  Interest and the
Original Class B-1 Fractional Interest, respectively, but the Current Class  B-2
Fractional Interest is less than the Original Class B-2 Fractional Interest, the
Class  B-3,  Class  B-4 and  Class  B-5  Certificates will  not  be  entitled to
distributions in  respect  of  principal  and the  Class  B  Subclass  Principal
Balances  of  such  Subclasses  will  not  be  used  to  determine  the  Class M
Percentage, the Class M  Prepayment Percentage, the  Subclass B Percentages  for
the Subclasses of Class B Certificates with lower numerical designations and the
Subclass  B Prepayment  Percentages for the  Subclasses of  Class B Certificates
with lower numerical designations for such Distribution Date. In the event  that
each  of  the  Current  Class  M  Fractional  Interest,  the  Current  Class B-1
Fractional Interest  and the  Current Class  B-2 Fractional  Interest equals  or
exceeds  the  Original  Class  M Fractional  Interest,  the  Original  Class B-1
Fractional  Interest   and  the   Original   Class  B-2   Fractional   Interest,
respectively,  but the  Current Class B-3  Fractional Interest is  less than the
Original Class B-3 Fractional Interest, the Class B-4 and Class B-5 Certificates
will not be entitled to  distributions in respect of  principal and the Class  B
Subclass Principal Balances of such Subclasses will not be used to determine the
Class   M  Percentage,  the  Class  M  Prepayment  Percentage,  the  Subclass  B
Percentages for  the Subclasses  of Class  B Certificates  with lower  numerical
designations  and the  Subclass B Prepayment  Percentages for  the Subclasses of
Class B Certificates  with lower  numerical designations  for such  Distribution
Date.  In the event  that each of  the Current Class  M Fractional Interest, the
Current Class B-1 Fractional Interest, the Current Class B-2 Fractional Interest
and the Current  Class B-3 Fractional  Interest equals or  exceeds the  Original
Class  M Fractional  Interest, the Original  Class B-1  Fractional Interest, the
Original Class B-2  Fractional Interest  and the Original  Class B-3  Fractional
Interest,  respectively, but the  Current Class B-4  Fractional Interest is less
than the Original Class B-4 Fractional Interest, the Class B-5 Certificates will
not be  entitled  to distributions  in  respect of  principal  and the  Class  B
Subclass  Principal Balance of such  Subclass will not be  used to determine the
Class  M  Percentage,  the  Class  M  Prepayment  Percentage,  the  Subclass   B
Percentages  for the  Subclasses of  Class B  Certificates with  lower numerical
designations and the  Subclass B  Prepayment Percentages for  the Subclasses  of
Class  B Certificates  with lower  numerical designations  for such Distribution
Date. The Class B-5  Certificates will not have  original or current  fractional
interests which are required to be maintained as described above.
 
    The  "Original Class  M Fractional Interest"  is the  percentage obtained by
dividing the sum of the initial Class B Subclass Principal Balances of the Class
B-1, Class B-2, Class B-3,  Class B-4 and Class B-5  Certificates by the sum  of
the  initial Class A Non-PO Principal Balance, initial Class M Principal Balance
and initial Class B Principal Balance. The Original Class M Fractional  Interest
is expected to be approximately 3.55%. The "Current Class M Fractional Interest"
for  any Distribution Date is the percentage obtained by dividing the sum of the
then-outstanding Class B Subclass
 
                                      S-53
<PAGE>
Principal Balances of the Class B-1, Class  B-2, Class B-3, Class B-4 and  Class
B-5  Certificates by  the sum of  the then-outstanding Class  A Non-PO Principal
Balance, the Class M Principal Balance and the Class B Principal Balance.
 
    The "Original Class B-1 Fractional  Interest" is the percentage obtained  by
dividing the sum of the initial 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 initial
Class A Non-PO Principal Balance, initial Class M Principal Balance and  initial
Class  B  Principal  Balance.  The Original  Class  B-1  Fractional  Interest is
expected to be approximately 2.28%. The "Current Class B-1 Fractional  Interest"
for  any Distribution Date is the percentage obtained by dividing the sum of the
then-outstanding 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 then-outstanding
Class A Non-PO Principal Balance, the Class M Principal Balance and the Class  B
Principal Balance.
 
    The  "Original Class B-2 Fractional Interest"  is the percentage obtained by
dividing the sum of the initial Class B Subclass Principal Balances of the Class
B-3, Class B-4  and Class B-5  Certificates by the  sum of the  initial Class  A
Non-PO  Principal Balance, initial Class M Principal Balance and initial Class B
Principal Balance. The Original Class B-2 Fractional Interest is expected to  be
approximately  1.27%.  The  "Current  Class  B-2  Fractional  Interest"  for any
Distribution Date  is  the  percentage  obtained by  dividing  the  sum  of  the
then-outstanding Class B Subclass Principal Balances of the Class B-3, Class B-4
and  Class B-5 Certificates  by the sum  of the then-outstanding  Class A Non-PO
Principal Balance,  the Class  M Principal  Balance and  the Class  B  Principal
Balance.
 
    The  "Original Class B-3 Fractional Interest"  is the percentage obtained by
dividing the sum of the initial Class B Subclass Principal Balances of the Class
B-4 and  Class  B-5 Certificates  by  the sum  of  the initial  Class  A  Non-PO
Principal  Balance,  initial  Class  M Principal  Balance  and  initial  Class B
Principal Balance. The Original Class B-3 Fractional Interest is expected to  be
approximately  0.76%.  The  "Current  Class  B-3  Fractional  Interest"  for any
Distribution Date  is  the  percentage  obtained by  dividing  the  sum  of  the
then-outstanding  Class B Subclass Principal Balances of the Class B-4 and Class
B-5 Certificates by  the sum of  the then-outstanding Class  A Non-PO  Principal
Balance, the Class M Principal Balance and the Class B Principal Balance.
 
    The  "Original Class B-4 Fractional Interest"  is the percentage obtained by
dividing the  initial  Class B  Subclass  Principal  Balance of  the  Class  B-5
Certificates by the sum of the initial Class A Non-PO Principal Balance, initial
Class  M Principal Balance  and initial Class B  Principal Balance. The Original
Class B-4  Fractional  Interest  is  expected to  be  approximately  0.51%.  The
"Current  Class  B-4  Fractional  Interest" for  any  Distribution  Date  is the
percentage obtained by dividing the then-outstanding Class B Subclass  Principal
Balance of the Class B-5 Certificates by the sum of the then-outstanding Class A
Non-PO  Principal  Balance,  the  Class  M Principal  Balance  and  the  Class B
Principal Balance.
 
  ALLOCATION OF AMOUNT TO BE DISTRIBUTED
 
    On each  Distribution  Date occurring  prior  to the  Class  A-11  Accretion
Termination Date, an amount equal to the Class A-11 Accrual Distribution Amount,
if  any, for such Distribution Date will  be allocated sequentially to the Class
A-13 Certificates and Class A-11 Certificates, in that order, until the Class  A
Subclass Principal Balance of each such Subclass has been reduced to zero.
 
    On  each Distribution  Date occurring  prior to  the Class  A-12 TAC Accrual
Component Accretion Termination  Date, an  amount equal  to the  Class A-12  TAC
Accrual  Component Distribution Amount, if any,  for such Distribution Date will
be allocated  sequentially  to  the  Class A-10  Certificates,  the  Class  A-16
Certificates,  the  Class  A-2  Certificates  and  the  Class  A-12  TAC Accrual
Component, in that order, until the  Class A Subclass Principal Balance of  each
such  Subclass and the  Component Principal Balance of  such Component have 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-12 Certificates) and  the Component Principal  Balance of the
Class A-12 TAC Accrual Component as follows:
 
                                      S-54
<PAGE>
    FIRST, to the Class A-5 Certificates, up to the Class A-5 Priority Amount;
 
    SECOND, concurrently as follows:
 
(A) approximately 14.09803311% sequentially as follows:
 
    (i) concurrently, to the Class  A-R and Class  A-LR Certificates, pro  rata,
        until  the Class A Subclass Principal  Balance of each such Subclass has
        been reduced to zero;
 
    (ii) concurrently, approximately 15.84741951% to the Class A-1  Certificates
         and approximately 84.15258049% to the Class A-6 Certificates, until the
         sum  of their Class  A Subclass Principal Balances  has been reduced to
         approximately 36.35268832% of the sum of their initial Class A Subclass
         Principal Balances;
 
   (iii) concurrently, approximately 12.73510405% to the Class A-1  Certificates
         and approximately 87.26489587% to the Class A-6 Certificates, until the
         Class  A Subclass Principal  Balance of the  Class A-1 Certificates has
         been reduced to zero;
 
   (iv) concurrently, approximately 79.94991891% to  the Class A-6  Certificates
        and  approximately 20.05008109% to the Class A-3 Certificates, until the
        Class A Subclass  Principal Balance  of the Class  A-6 Certificates  has
        been reduced to zero;
 
    (v) to  the Class  A-3 Certificates,  until the  Class A  Subclass Principal
        Balance thereof has been reduced to zero;
 
   (vi) to the  Class A-4  Certificates, until  the Class  A Subclass  Principal
        Balance thereof has been reduced to zero;
 
(B) approximately 85.90196689% sequentially as follows:
 
    (i) concurrently,  approximately 8.83419499% to  the Class A-7 Certificates,
        approximately  72.08577066%   to   the  Class   A-8   Certificates   and
        approximately  19.08003435% to  the Class  A-15 Certificates,  until the
        Class A-8 Certificates  have received  their TAC  Principal Amount  with
        respect to such Distribution Date;
 
    (ii) concurrently, approximately 11.04279433% to the Class A-7 Certificates,
         approximately  9.71918183% to the Class A-9 Certificates, approximately
         64.52991885%  to  the   Class  A-14   Certificates  and   approximately
         14.70810500% to the Class A-15 Certificates, up to their respective TAC
         Principal Amounts with respect to such Distribution Date;
 
   (iii) to the Class A-12 TAC Accrual Component, up to its TAC Principal Amount
         with respect to such Distribution Date;
 
   (iv) sequentially,  to the  Class A-13 and  Class A-11  Certificates, in that
        order, until  the  Class  A  Subclass Principal  Balance  of  each  such
        Subclass has been reduced to zero;
 
    (v) concurrently,  approximately 8.83419499% to  the Class A-7 Certificates,
        approximately  72.08577066%   to   the  Class   A-8   Certificates   and
        approximately  19.08003435%  to  the  Class  A-15  Certificates, without
        regard to the  TAC Principal Amount  of the Class  A-8 Certificates  and
        until   the  Class  A  Subclass  Principal  Balance  of  the  Class  A-8
        Certificates has been reduced to zero;
 
   (vi) concurrently, approximately 11.04279433% to the Class A-7  Certificates,
        approximately  9.71918183% to the  Class A-9 Certificates, approximately
        64.52991885%  to   the  Class   A-14  Certificates   and   approximately
        14.70810500% to the Class A-15 Certificates, without regard to their TAC
        Principal  Amounts and until  the Class A  Subclass Principal Balance of
        each such Subclass has been reduced to zero;
 
   (vii) sequentially, to the Class A-10, Class A-16 and Class A-2 Certificates,
         in that order,  until the Class  A Subclass Principal  Balance of  each
         such Subclass has been reduced to zero;
 
  (viii) to  the Class  A-12 TAC  Accrual Component,  without regard  to its TAC
         Principal Amount and until the Component Principal Balance thereof  has
         been reduced to zero; and
 
                                      S-55
<PAGE>
    THIRD,  to the Class A-5 Certificates,  until the Class A Subclass Principal
Balance thereof has been reduced to zero.
 
    The "Class A-5 Priority Amount" for  any Distribution Date means the  lesser
of  (i) the Class A Subclass Principal Balance of the Class A-5 Certificates and
(ii) the sum  of (A) the  product of (1)  the Class A-5  Percentage and (2)  the
Scheduled  Principal Amount and (B) the product of (1) the Class A-5 Percentage,
(2) the Class A-5 Prepayment Shift Percentage, and (3) the Unscheduled Principal
Amount.
 
    The "Class A-5 Percentage" means the  Class A Subclass Principal Balance  of
the Class A-5 Certificates divided by the Pool Balance (Non-PO Portion).
 
    The "Scheduled Principal Amount" means 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 B(i) and B(iv) of the definition  of
"Class  A Non-PO Optimal Principal Amount" on page S-47, but without that amount
being multiplied by the Class A Percentage.
 
    The "Unscheduled  Principal  Amount"  means the  sum  for  each  outstanding
Mortgage  Loan (including each defaulted Mortgage  Loan, other than a Liquidated
Loan, with respect to which the  related Mortgage 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 B(ii) and B(iii) of the
definition of  "Class A  Non-PO  Optimal Principal  Amount"  on page  S-47,  but
without that amount being multiplied by the Class A Prepayment Percentage.
 
    The  "Class A-5 Prepayment Shift Percentage"  for any Distribution Date will
be the percentage indicated below:
 
<TABLE>
<CAPTION>
DISTRIBUTION DATE OCCURRING IN                                                 CLASS A-5 PREPAYMENT SHIFT PERCENTAGE
- -----------------------------------------------------------------------------  -------------------------------------
<S>                                                                            <C>
September 1996 through August 2001...........................................                       0%
September 2001 through August 2002...........................................                      30%
September 2002 through August 2003...........................................                      40%
September 2003 through August 2004...........................................                      60%
September 2004 through August 2005...........................................                      80%
September 2005 and thereafter................................................                     100%
</TABLE>
 
                                      S-56
<PAGE>
    As  used above, the "TAC Principal Amount" for any Distribution Date and for
any Subclass of TAC Certificates and the Class A-12 TAC Accrual Component  means
the  amount, if any, that would reduce the Class A Subclass Principal Balance of
such Subclass  or the  Component  Principal Balance  of  such Component  to  the
percentage  of  its  initial Class  A  Subclass Principal  Balance  or Component
Principal Balance  shown in  the tables  set forth  below with  respect to  such
Distribution Date.
 
    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 Subclasses  of Class  A Certificates  (other than  the
Class A-12 Certificates with respect to the Class A-12 PO Component) pro rata in
accordance with their respective outstanding Class A Subclass Principal Balances
(less in the case of the Class A-12 Certificates the Component Principal Balance
of  the Class A-12 PO Component) without regard to either the proportions or the
priorities set forth above.
 
    Any amounts distributed  on a Distribution  Date to the  holders of Class  A
Certificates of any Subclass in reduction of principal balance will be allocated
among  the  holders  of  Class  A Certificates  of  such  Subclass  pro  rata in
accordance with their respective Percentage Interests.
 
    Amounts distributed on any Distribution Date  to the holders of the Class  M
and  Offered  Class B  Certificates in  reduction of  principal balance  will be
allocated among  the  holders  of  each  such Class  or  Subclass  pro  rata  in
accordance with their respective Percentage Interests.
 
    The following tables set forth for each Distribution Date the targeted Class
A  Subclass Principal Balance and targeted  Component Principal Balance for each
Subclass of TAC Certificates and the Class A-12 TAC Accrual Component  expressed
as  a percentage of  the initial Class  A Subclass Principal  Balance or initial
Component Principal Balance of such Subclass or Component, as the case may be.
 
                               TARGETED BALANCES
 
                  TARGETED CLASS A SUBCLASS PRINCIPAL BALANCES
         AS PERCENTAGES OF INITIAL CLASS A SUBCLASS PRINCIPAL BALANCES
                             CLASS A-7 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
                       ----------------%
    DISTRIBUTION          99.71475211
        DATE              99.37351635
- ---------------------     98.97642343
                          98.52367143
September 1996.......     98.01552599
October 1996.........     97.45232029
November 1996........     96.83449012
December 1996........     96.16250200
January 1997.........     95.43688911
February 1997........     94.65825097
March 1997...........     93.82725252
April 1997...........     92.94462355
May 1997.............     92.01115770
June 1997............     91.02771123
July 1997............     89.99520214
August 1997..........     88.91460851
September 1997.......     87.78699664
October 1997.........     86.61350689
November 1997........     85.39539506
December 1997........     84.13401563
January 1998.........     82.83072319
February 1998........     81.48698545
March 1998...........     80.10430439
April 1998...........     78.68474679
May 1998.............     77.23054260
June 1998............     75.74575704
July 1998............     74.23922735
August 1998..........     72.71915854
September 1998.......     71.19915865
October 1998.........     69.69435028
November 1998........     68.20935588
December 1998........     66.74392538
January 1999.........     65.29781191
February 1999........   PERCENTAGE OF
March 1999...........  INITIAL CLASS A
April 1999...........      SUBCLASS
May 1999.............     PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
June 1999............     63.87077168
July 1999............     62.46256408
August 1999..........     61.07295150
September 1999.......     59.70169942
October 1999.........     58.34857618
November 1999........     57.01335325
December 1999........     55.69580485
January 2000.........     54.39570811
February 2000........     53.11284314
March 2000...........     51.84699265
April 2000...........     50.59794221
May 2000.............     49.36548021
June 2000............     48.14939757
July 2000............     46.94948793
August 2000..........     45.76554770
September 2000.......     44.59737576
October 2000.........     43.44477347
November 2000........     42.30754491
December 2000........     41.18549658
January 2001.........     40.07843746
February 2001........     38.74161436
March 2001...........     37.39455305
April 2001...........     36.06553001
May 2001.............     34.75431855
June 2001............     33.46069468
July 2001............     32.18443732
August 2001..........     30.92532828
September 2001.......     29.78235299
October 2001.........     28.65551561
November 2001........     27.54460665
December 2001........     26.44941927
January 2002.........     25.36974927
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
February 2002........     24.30539498
March 2002...........     23.25615748
April 2002...........     22.22184013
May 2002.............     21.20224904
June 2002............     20.19719270
July 2002............     19.20648199
August 2002..........     18.22993034
September 2002.......     17.29853969
October 2002.........     16.38059551
November 2002........     15.47592017
December 2002........     14.58433835
January 2003.........     13.70567708
February 2003........     12.83976555
March 2003...........     11.98643513
April 2003...........     11.14551939
May 2003.............     10.31685408
June 2003............      9.50027690
July 2003............      8.69562778
August 2003..........      7.90274873
September 2003.......      7.17934642
October 2003.........      6.46652964
November 2003........      5.76415463
December 2003........      5.07207937
January 2004.........      4.39016394
February 2004........      3.71827003
March 2004...........      3.05626124
April 2004...........      2.40400298
May 2004.............      1.76136240
June 2004............      1.12820835
July 2004............      0.50441146
August 2004
and thereafter.......      0.00000000
</TABLE>
 
                                      S-57
<PAGE>
                  TARGETED CLASS A SUBCLASS PRINCIPAL BALANCES
         AS PERCENTAGES OF INITIAL CLASS A SUBCLASS PRINCIPAL BALANCES
 
                             CLASS A-8 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
                       ----------------%
    DISTRIBUTION          99.52486863
        DATE              98.95647948
- ---------------------     98.29505025
                          97.54091087
September 1996.......     96.69450379
October 1996.........     95.75638399
November 1996........     94.72727740
December 1996........     93.60796103
January 1997.........     92.39932306
February 1997........     91.10236202
March 1997...........     89.71818556
April 1997...........     88.24800927
May 1997.............     86.69315499
June 1997............     85.05504913
July 1997............     83.33522063
August 1997..........     81.53529875
September 1997.......     79.65705962
October 1997.........     77.70240267
November 1997........     75.67341963
December 1997........   PERCENTAGE OF
January 1998.........  INITIAL CLASS A
February 1998........      SUBCLASS
March 1998...........     PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
April 1998...........     73.57236676
May 1998.............     71.40150020
June 1998............     69.16326473
July 1998............     66.86016228
August 1998..........     64.49563533
September 1998.......     62.07339828
October 1998.........     59.60022251
November 1998........     57.09082798
December 1998........     54.55888161
January 1999.........     52.02705013
February 1999........     49.52052273
March 1999...........     47.04699907
April 1999...........     44.60606261
May 1999.............     42.19730210
June 1999............     39.82031152
July 1999............     37.47469003
August 1999..........     35.16004189
September 1999.......     32.87597637
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
October 1999.........     30.62210776
November 1999........     28.39805524
December 1999........     26.20344283
January 2000.........     24.03789935
February 2000........     21.90105836
March 2000...........     19.79255807
April 2000...........     17.71204132
May 2000.............     15.65915549
June 2000............     13.63355245
July 2000............     11.63488852
August 2000..........      9.66282440
September 2000.......      7.71702513
October 2000.........      5.79716002
November 2000........      3.90290257
December 2000........      2.03393049
January 2001.........      0.18992557
February 2001
and thereafter.......      0.00000000
</TABLE>
 
                             CLASS A-9 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
                       ----------------%
DISTRIBUTION DATE        100.00000000
- ---------------------     96.94027760
                          93.56962557
Up to and including       90.24410957
January 2001.........     86.96316195
February 2001........     83.72622254
March 2001...........     80.53273825
April 2001...........     77.38216280
May 2001.............     74.52218007
June 2001............     71.70257828
July 2001............     68.92283296
August 2001..........     66.18242653
September 2001.......     63.48084810
October 2001.........     60.81759315
November 2001........     58.19216351
December 2001........   PERCENTAGE OF
January 2002.........  INITIAL CLASS A
February 2002........      SUBCLASS
March 2002...........     PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
April 2002...........     55.60406781
May 2002.............     53.05282036
June 2002............     50.53794224
July 2002............     48.05896008
August 2002..........     45.61540699
September 2002.......     43.28485716
October 2002.........     40.98795314
November 2002........     38.72425085
December 2002........     36.49331172
January 2003.........     34.29470258
February 2003........     32.12799618
March 2003...........     29.99277053
April 2003...........     27.88860929
May 2003.............     25.81510122
June 2003............     23.77184060
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
July 2003............     21.75842667
August 2003..........     19.77446390
September 2003.......     17.96434782
October 2003.........     16.18071914
November 2003........     14.42321801
December 2003........     12.69148924
January 2004.........     10.98518262
February 2004........      9.30395215
March 2004...........      7.64745654
April 2004...........      6.01535886
May 2004.............      4.40732687
June 2004............      2.82303228
July 2004............      1.26215161
August 2004
and thereafter.......      0.00000000
</TABLE>
 
                                      S-58
<PAGE>
                     TARGETED COMPONENT PRINCIPAL BALANCES
             AS PERCENTAGES OF INITIAL COMPONENT PRINCIPAL BALANCE
                        CLASS A-12 TAC ACCRUAL COMPONENT
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
                          PRINCIPAL
                           BALANCE
                       ----------------%
                         100.64583334
DISTRIBUTION DATE        101.29583768
- ---------------------    101.95003995
                         102.60846731
September 1996.......    103.27114699
October 1996.........    103.93810649
November 1996........    104.60937342
December 1996........    105.28497561
January 1997.........    105.96494108
February 1997........    106.64929801
March 1997...........    107.33807471
April 1997...........    108.03129977
May 1997.............    108.72900191
June 1997............    109.43121007
July 1997............    110.13795329
August 1997..........    110.84926092
September 1997.......    111.56516239
October 1997.........    112.28568740
November 1997........    113.01086577
December 1997........    113.74072764
January 1998.........    114.47530315
February 1998........    115.21462283
March 1998...........    115.95871727
April 1998...........    116.70761732
May 1998.............    117.46135401
June 1998............    118.21995858
July 1998............    118.98346249
August 1998..........    119.75189735
September 1998.......    120.52529501
October 1998.........    121.30368757
November 1998........    122.08710722
December 1998........    122.87558644
January 1999.........    123.66915793
February 1999........    124.46785457
March 1999...........    125.27170947
April 1999...........    126.08075593
May 1999.............    126.89502749
June 1999............    127.71455788
July 1999............    128.53938105
August 1999..........    129.36953122
September 1999.......    130.20504277
October 1999.........    131.04595033
November 1999........    131.89228875
December 1999........    132.74409315
January 2000.........    133.60139874
February 2000........    134.46424110
March 2000...........    135.33265598
April 2000...........    136.20667939
May 2000.............    137.08634754
June 2000............    137.97169685
July 2000............    138.86276406
August 2000..........    139.75958609
September 2000.......    140.66220007
October 2000.........    141.57064345
November 2000........    142.48495385
December 2000........    143.40516920
January 2001.........    144.33132758
February 2001........    145.26346741
March 2001...........    146.20162731
April 2001...........    147.14584614
May 2001.............    148.09616305
June 2001............    149.05261746
July 2001............    150.01524892
August 2001..........   PERCENTAGE OF
September 2001.......      INITIAL
October 2001.........     COMPONENT
November 2001........     PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
December 2001........    150.98409741
January 2002.........    151.95920305
February 2002........    152.94060622
March 2002...........    153.92834765
April 2002...........    154.92246824
May 2002.............    155.92300915
June 2002............    156.93001194
July 2002............    157.94351827
August 2002..........    158.96357015
September 2002.......    159.99020986
October 2002.........    161.02347996
November 2002........    162.06342328
December 2002........    163.11008289
January 2003.........    164.16350218
February 2003........    165.22372478
March 2003...........    166.29079469
April 2003...........    167.36475605
May 2003.............    168.44565346
June 2003............    169.53353161
July 2003............    170.62843568
August 2003..........    171.73041099
September 2003.......    172.83950323
October 2003.........    173.95575835
November 2003........    175.07922264
December 2003........    176.20994262
January 2004.........    177.34796516
February 2004........    178.49333743
March 2004...........    179.64610690
April 2004...........    180.80632136
May 2004.............    181.97402886
June 2004............    183.14927778
July 2004............    184.33211686
August 2004..........    183.65276562
September 2004.......    180.23939407
October 2004.........    176.87485681
November 2004........    173.55848661
December 2004........    170.28962513
January 2005.........    167.06762276
February 2005........    163.89183858
March 2005...........    160.76164012
April 2005...........    157.67640345
May 2005.............    154.63551286
June 2005............    151.63836082
July 2005............    148.68434798
August 2005..........    145.77288292
September 2005.......    143.18240682
October 2005.........    140.62614237
November 2005........    138.10364964
December 2005........    135.61449434
January 2006.........    133.15824765
February 2006........    130.73448626
March 2006...........    128.34279219
April 2006...........    125.98275283
May 2006.............    123.65396072
June 2006............    121.35601366
July 2006............    119.08851460
August 2006..........    116.85107137
September 2006.......    114.64329699
October 2006.........    112.46480928
November 2006........    110.31523095
December 2006........    108.19418951
January 2007.........    106.10131720
February 2007........    104.03625100
 
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
                          PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
March 2007...........    101.99863236
April 2007...........     99.98810750
May 2007.............     98.00432692
June 2007............     96.04694579
July 2007............     94.11562346
August 2007..........     92.21002377
September 2007.......     90.32981474
October 2007.........     88.47466871
November 2007........     86.64426210
December 2007........     84.83827548
January 2008.........     83.05639353
February 2008........     81.29830485
March 2008...........     79.56370214
April 2008...........     77.85228193
May 2008.............     76.16374457
June 2008............     74.49779430
July 2008............     72.85413914
August 2008..........     71.23249078
September 2008.......     69.63256459
October 2008.........     68.05407961
November 2008........     66.49675838
December 2008........     64.96032710
January 2009.........     63.44451534
February 2009........     61.94905612
March 2009...........     60.47368600
April 2009...........     59.01814473
May 2009.............     57.58217547
June 2009............     56.16552467
July 2009............     54.76794193
August 2009..........     53.38918014
September 2009.......     52.02899527
October 2009.........     50.68714642
November 2009........     49.36339581
December 2009........     48.05750863
January 2010.........     46.76925307
February 2010........     45.49840036
March 2010...........     44.24472452
April 2010...........     43.00800255
May 2010.............     41.78801430
June 2010............     40.58454236
July 2010............     39.39737215
August 2010..........     38.22629182
September 2010.......     37.07109221
October 2010.........     35.93156686
November 2010........     34.80751191
December 2010........     33.69872612
January 2011.........     32.60501085
February 2011........     31.52616995
March 2011...........     30.46200978
April 2011...........     29.41233924
May 2011.............     28.37696959
June 2011............     27.35571453
July 2011............     26.34839017
August 2011..........     25.35481494
October 2011.........     23.40819720
November 2011........     22.45480302
December 2011........     21.51445470
January 2012.........     20.58698190
February 2012........     19.67221661
March 2012...........     18.76999287
April 2012...........     17.88014694
May 2012.............     17.00251709
June 2012............     16.13694369
</TABLE>
 
                                      S-59
<PAGE>
           TARGETED CLASS A SUBCLASS OR COMPONENT PRINCIPAL BALANCES
   AS PERCENTAGES OF INITIAL CLASS A SUBCLASS OR COMPONENT PRINCIPAL BALANCES
 
                  CLASS A-12 TAC ACCRUAL COMPONENT (CONTINUED)
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
                          PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
                                     %
<S>                    <C>
July 2012............     15.28326913
August 2012..........     14.44133790
September 2012.......     13.61099637
October 2012.........     12.79209296
November 2012........     11.98447803
December 2012........     11.18800375
January 2013.........     10.40252434
February 2013........      9.62789574
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
                          PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
March 2013...........      8.86397584
April 2013...........      8.11062435
May 2013.............      7.36770266
June 2013............      6.63507412
July 2013............      5.91260362
August 2013..........      5.20015801
September 2013.......      4.49760565
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
                          PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
October 2013.........      3.80481669
November 2013........      3.12166296
December 2013........      2.44801785
January 2014.........      1.78375645
February 2014........      1.12875541
March 2014...........      0.48289297
April 2014...........      0.00000000
</TABLE>
 
                            CLASS A-14 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
                       ----------------%
DISTRIBUTION DATE        100.00000000
- ---------------------     96.94027763
                          93.56962559
Up to and including       90.24410957
January 2001.........     86.96316202
February 2001........     83.72622260
March 2001...........     80.53273821
April 2001...........     77.38216275
May 2001.............     74.52218012
June 2001............     71.70257828
July 2001............     68.92283295
August 2001..........     66.18242654
September 2001.......     63.48084808
October 2001.........     60.81759308
November 2001........     58.19216356
December 2001........   PERCENTAGE OF
January 2002.........  INITIAL CLASS A
February 2002........      SUBCLASS
March 2002...........     PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
April 2002...........     55.60406780
May 2002.............     53.05282041
June 2002............     50.53794220
July 2002............     48.05896006
August 2002..........     45.61540698
September 2002.......     43.28485712
October 2002.........     40.98795318
November 2002........     38.72425091
December 2002........     36.49331168
January 2003.........     34.29470254
February 2003........     32.12799614
March 2003...........     29.99277054
April 2003...........     27.88860926
May 2003.............     25.81510121
June 2003............     23.77184054
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
July 2003............     21.75842660
August 2003..........     19.77446396
September 2003.......     17.96434782
October 2003.........     16.18071909
November 2003........     14.42321795
December 2003........     12.69148929
January 2004.........     10.98518264
February 2004........      9.30395218
March 2004...........      7.64745656
April 2004...........      6.01535893
May 2004.............      4.40732686
June 2004............      2.82303232
July 2004............      1.26215155
August 2004
and thereafter.......      0.00000000
</TABLE>
 
                                      S-60
<PAGE>
                  TARGETED CLASS A SUBCLASS PRINCIPAL BALANCES
         AS PERCENTAGES OF INITIAL CLASS A SUBCLASS PRINCIPAL BALANCES
 
                            CLASS A-15 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
                       ----------------%
                          99.66315084
DISTRIBUTION DATE         99.26018531
- ---------------------     98.79125831
                          98.25660345
September 1996.......     97.65653436
October 1996.........     96.99144471
November 1996........     96.26184881
December 1996........     95.46829795
January 1997.........     94.61142160
February 1997........     93.69192761
March 1997...........     92.71060144
April 1997...........     91.66830477
May 1997.............     90.56597498
June 1997............     89.40462294
July 1997............     88.18533276
August 1997..........     86.90925936
September 1997.......     85.57766244
October 1997.........     84.19188831
November 1997........     82.75341967
December 1997........     81.26385654
January 1998.........     79.72479843
February 1998........     78.13797824
March 1998...........     76.50516996
April 1998...........     74.82881408
May 1998.............     73.11154413
June 1998............     71.35816075
July 1998............     69.57909972
August 1998..........     67.78405003
September 1998.......     65.98908201
October 1998.........     64.21205363
November 1998........     62.45842332
December 1998........     60.72789622
January 1999.........     59.02018076
February 1999........   PERCENTAGE OF
March 1999...........  INITIAL CLASS A
April 1999...........      SUBCLASS
May 1999.............     PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
June 1999............     57.33498860
July 1999............     55.67203607
August 1999..........     54.03104247
September 1999.......     52.41173065
October 1999.........     50.81382725
November 1999........     49.23706222
December 1999........     47.68116900
January 2000.........     46.14588461
February 2000........     44.63094930
March 2000...........     43.13610608
April 2000...........     41.66110229
May 2000.............     40.20568773
June 2000............     38.76961547
July 2000............     37.35264211
August 2000..........     35.95452697
September 2000.......     34.57503238
October 2000.........     33.21392421
November 2000........     31.87097076
December 2000........     30.54594388
January 2001.........     29.23861761
February 2001........     28.21346723
March 2001...........     27.23247376
April 2001...........     26.26461657
May 2001.............     25.30973066
June 2001............     24.36765286
July 2001............     23.43822217
August 2001..........     22.52127972
September 2001.......     21.68891131
October 2001.........     20.86829529
November 2001........     20.05927909
December 2001........     19.26171211
January 2002.........     18.47544558
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
February 2002........     17.70033270
March 2002...........     16.93622852
April 2002...........     16.18298999
May 2002.............     15.44047576
June 2002............     14.70854641
July 2002............     13.98706425
August 2002..........     13.27589336
September 2002.......     12.59761088
October 2002.........     11.92912070
November 2002........     11.27029350
December 2002........     10.62100168
January 2003.........      9.98111918
February 2003........      9.35052165
March 2003...........      8.72908627
April 2003...........      8.11669186
May 2003.............      7.51321874
June 2003............      6.91854880
July 2003............      6.33256546
August 2003..........      5.75515363
September 2003.......      5.22833800
October 2003.........      4.70923127
November 2003........      4.19772871
December 2003........      3.69372694
January 2004.........      3.19712403
February 2004........      2.70781925
March 2004...........      2.22571328
April 2004...........      1.75070813
May 2004.............      1.28270699
June 2004............      0.82161443
July 2004............      0.36733618
August 2004
and thereafter.......      0.00000000
</TABLE>
 
  PRINCIPAL PAYMENT CHARACTERISTICS OF THE TAC CERTIFICATES, THE CLASS A-12 TAC
   ACCRUAL COMPONENT AND THE COMPANION CERTIFICATES
 
    The percentages of the  initial Class A Subclass  Principal Balances of  the
TAC  Certificates  and the  Component Principal  Balance of  the Class  A-12 TAC
Accrual Component set forth  in the preceding tables  were calculated using  the
assumptions  described in the last paragraph on  page S-90 herein. Based on such
assumptions, the Class  A Subclass  Principal Balance  of each  Subclass of  TAC
Certificates  and the Component Principal Balance  of the Class A-12 TAC Accrual
Component would be  reduced to the  percentage of its  initial Class A  Subclass
Principal Balance or Component Principal Balance as applicable, indicated in the
preceding tables for each Distribution Date if prepayments or the Mortgage Loans
occur  at  a constant  rate of  approximately  235% SPA.  However, IT  IS HIGHLY
UNLIKELY THAT PRINCIPAL  PREPAYMENTS ON  THE MORTGAGE  LOANS WILL  OCCUR AT  ANY
CONSTANT  RATE  OR THAT  THE MORTGAGE  LOANS WILL  PREPAY AT  THE SAME  RATE. In
addition, even if principal prepayments were to occur at a constant rate,  there
may  be differences between the characteristics of the mortgage loans ultimately
included in the Trust  Estate and the  Mortgage Loans which  are expected to  be
included,  as described  herein. Therefore, there  can be no  assurance that the
Class A Subclass Principal  Balance of any Subclass  of TAC Certificates or  the
Component  Principal Balance of the Class  A-12 TAC Accrual Component, after the
application of the distributions  to be made on  any Distribution Date, will  be
equal  to the  applicable percentage of  the initial Class  A Subclass Principal
Balance or Component  Principal Balance,  as applicable,  for such  Distribution
Date specified in the tables above.
 
                                      S-61
<PAGE>
    The  weighted average  lives of the  Subclasses of TAC  Certificates and the
Class A-12 Certificates  with respect to  the Class A-12  TAC Accrual  Component
will  vary under  different prepayment scenarios.  To the  extent that principal
prepayments occur at a CONSTANT rate that is slower than approximately 235% SPA,
the  Class  A  Non-PO  Principal  Amount  on  each  Distribution  Date  may   be
insufficient to make distributions in reduction of the principal balances of one
or more of the Subclasses of the TAC Certificates or the Class A-12 Certificates
with  respect to  the Class  A-12 TAC  Accrual Component  in amounts  that would
reduce  their  principal  balances  or  Component  Principal  Balance  to  their
respective  targeted principal balances or  targeted Component Principal Balance
for such Distribution Date. The weighted average lives of the Subclasses of  the
TAC  Certificates or the Class A-12 Certificates  with respect to the Class A-12
TAC Accrual Component  may therefore  be extended,  as illustrated  for the  TAC
Certificates  by the  tables beginning  on page  S-92. To  the extent  that such
principal prepayments occur at a CONSTANT rate that is higher than approximately
235% SPA, the weighted average lives may be shortened as illustrated for the TAC
Certificates by the tables beginning on page S-92.
 
    Because any  Excess Principal  Payments for  any Distribution  Date will  be
distributed  to  Certificateholders on  such Distribution  Date, the  ability to
distribute the  TAC Principal  Amounts  on any  Distribution  Date will  not  be
enhanced  by the  averaging of  high and low  principal prepayment  rates on the
Mortgage Loans over several Distribution Dates, as might be the case if any such
Excess Principal Payments were held for future applications and not  distributed
monthly.  There  is  no assurance  that,  with  respect to  the  Class  A Non-PO
Principal Amount  (i)  distributions  in  reduction  of  the  Class  A  Subclass
Principal Balance of any Subclass of TAC Certificates (other than the Class A-7,
Class  A-8 and Class A-15 Certificates)  will not commence significantly earlier
than the first Distribution Date shown in the preceding tables relating to  such
Subclass,  (ii) distributions  in reduction  of the  Class A  Subclass Principal
Balance of any Subclass of TAC  Certificates or the Component Principal  Balance
or  the Class A-12  TAC Accrual Component will  not commence significantly later
than the first Distribution Date shown in the preceding tables relating to  such
Subclass  or Component or  (iii) the Class  A Subclass Principal  Balance of any
Subclass of TAC Certificates or and the Component Principal Balance of the Class
A-12 TAC Accrual Component will not be reduced to zero significantly earlier  or
significantly  later  than the  last Distribution  Date  shown in  the preceding
tables.
 
    The extent  to  which  the  targeted principal  balances  and  the  targeted
Component  Principal Balance  will be  achieved and  the sensitivity  of the TAC
Certificates and the Class A-12 Certificates with respect to the Class A-12  TAC
Accrual Component to principal prepayments on the Mortgage Loans will depend, in
part,  upon the  period of time  during which the  Companion Certificates remain
outstanding. On each Distribution Date, the excess of the portion of the Class A
Non-PO Principal Amount available to make distributions of principal to the  TAC
Certificates  over the  TAC Principal  Amounts ("Excess  Principal Payment") for
such Distribution Date will be distributed to the Companion Certificates  before
being  distributed to the TAC Certificates  and the Class A-12 Certificates with
respect to  the  Class  A-12  TAC Accrual  Component,  in  accordance  with  the
proportions  and priorities set forth above under "-- Allocation of Amount to be
Distributed." This is  intended to  decrease the likelihood  that the  principal
balances of the TAC Certificates or the Component Principal Balance of the Class
A-12  TAC  Accrual Component  will be  reduced  below their  respective targeted
principal  balances  or  targeted  Component   Principal  Balance  on  a   given
Distribution  Date. As  such, and  in accordance  with the  priorities described
above, the Companion  Certificates support  the TAC Certificates  and the  Class
A-12 Certificates with respect to the Class A-12 TAC Accrual Component. However,
under  certain relatively fast prepayment scenarios, the TAC Certificates or the
Class A-12  TAC  Accrual Component  may  continue  to be  outstanding  when  the
Companion  Certificates are no longer outstanding. Under such circumstances, all
Excess Principal Payments will be applied to the TAC Certificates and the  Class
A-12  Certificates with respect  to the Class A-12  TAC Accrual Component (other
than  the  portion  applied  to  the  Class  A-2,  Class  A-10  and  Class  A-16
Certificates)  in  accordance  with  the  proportions  and  priorities described
herein. Thus, when  the principal  balances of the  Companion Certificates  have
been reduced to zero, any Subclasses of TAC Certificates then outstanding or the
Class  A-12 TAC  Accrual Component if  outstanding will, in  accordance with the
proportions and
 
                                      S-62
<PAGE>
priorities set forth above, become more  sensitive to the rate of prepayment  on
the  Mortgage Loans as such Subclasses and  the Class A-12 TAC Accrual Component
will receive all Excess Principal Payments (other than the amounts distributable
to the Class A-2,  Class A-10 and Class  A-16 Certificates) until the  principal
balances  of the  TAC Certificates  and the  Component Principal  Balance of the
Class A-12 TAC Accrual  Component have been reduced  to zero. Conversely,  under
certain  relatively slow prepayment scenarios, the portion of the Class A Non-PO
Principal Amount  available  to  make  distributions of  principal  to  the  TAC
Certificates  and the Class A-12 Certificates with respect to the Class A-12 TAC
Accrual Component may not be sufficient to pay the TAC Principal Amounts for the
TAC Certificates and the Class A-12 Certificates with respect to the Class  A-12
TAC  Accrual Component on a given Distribution  Date. In such cases, the portion
of the  Class A  Non-PO  Principal Amount  available  to make  distributions  of
principal  to the TAC Certificates and  the Class A-12 Certificates with respect
to the Class A-12  TAC Accrual Component for  each subsequent Distribution  Date
will  be applied  in accordance  with the  proportions and  priorities described
herein such that the Companion  Certificates will not receive any  distributions
in  reduction  of their  principal balances  from the  Class A  Non-PO Principal
Amount until the outstanding principal balances of the TAC Certificates and  the
Component Principal Balance of the Class A-12 TAC Accrual Component have reached
their  respective targeted  principal balances  or targeted  Component Principal
Balance for such Distribution  Date. As a result,  the weighted average life  of
any  Subclass of TAC Certificates or the Class A-12 Certificates with respect to
the Class A-12 TAC  Accrual Component may  be extended if  such Subclass or  the
Class  A-12 TAC Accrual Component  does not receive its  TAC Principal Amount on
such Distribution Date.
 
    THE WEIGHTED  AVERAGE LIVES  OF THE  COMPANION CERTIFICATES  WILL BE  HIGHLY
SENSITIVE  TO  THE  RATE OF  PRICIPAL  PAYMENTS (INCLUDING  PREPAYMENTS)  ON THE
MORTGAGE LOANS. See "Prepayment and Yield Considerations" herein.
 
ADDITIONAL RIGHTS OF THE CLASS A-R AND CLASS A-LR CERTIFICATEHOLDERS
 
    The Class A-R  and Class A-LR  Certificates will remain  outstanding for  as
long  as the Trust  Estate shall exist,  whether or not  either such Subclass is
receiving current distributions  of principal  or interest. The  holders of  the
Class  A-R and Class A-LR Certificates will  be entitled to receive the proceeds
of the remaining assets of the Trust  Estate, if any, on the final  Distribution
Date  for the Series 1996-4 Certificates,  after distributions in respect of any
accrued but  unpaid  interest  on  the  Series  1996-4  Certificates  and  after
distributions  in  reduction of  principal  balance have  reduced  the principal
balances of the Series 1996-4 Certificates  to zero. It is not anticipated  that
there will be any assets remaining in the Trust Estate on the final Distribution
Date  following  the distributions  of interest  and  in reduction  of principal
balance made on the Series 1996-4 Certificates on such date.
 
    In addition,  the Class  A-LR  Certificateholder will  be entitled  on  each
Distribution  Date to receive  any Pool Distribution  Amount remaining after all
distributions pursuant to the Pool Distribution Amount Allocation have been made
and any Net Foreclosure Profits.  "Net Foreclosure Profits" means, with  respect
to  any Distribution Date, the  excess, if any, of  (i) the aggregate profits on
Liquidated Loans in  the related period  with respect to  which net  Liquidation
Proceeds  exceed  the unpaid  principal  balance thereof  plus  accrued interest
thereon at the Mortgage Interest Rate over (ii) the aggregate Realized Losses on
Liquidated Loans in  the related period  with respect to  which net  Liquidation
Proceeds  are  less  than  the unpaid  principal  balance  thereof  plus accrued
interest thereon at the Mortgage Interest Rate. It is not anticipated that there
will be any such  Net Foreclosure Profits or  undistributed portion of the  Pool
Distribution Amounts.
 
PERIODIC ADVANCES
 
    If, on any Determination Date, payments of principal and interest due on any
Mortgage  Loan  in  the Trust  Estate  on the  related  Due Date  have  not been
received, the Servicer of the Mortgage  Loan will, in certain circumstances,  be
required  to advance on or before the  related Distribution Date for the benefit
of holders of  the Series 1996-4  Certificates an  amount in cash  equal to  all
delinquent  payments of principal and interest due  on each Mortgage Loan in the
Trust Estate (with  interest adjusted  to the applicable  Net Mortgage  Interest
Rate) not previously advanced, but only to the extent
 
                                      S-63
<PAGE>
that  such Servicer believes  that such amounts  will be recoverable  by it from
liquidation proceeds or other recoveries in respect of the related Mortgage Loan
(each, a  "Periodic Advance").  Upon a  Servicer's failure  to make  a  required
Periodic  Advance, the  Trustee, if  such Servicer  is Norwest  Mortgage, or the
Master Servicer, if such Servicer is  not Norwest Mortgage, will be required  to
make such Periodic Advance.
 
    The  Underlying Servicing Agreements and the Pooling and Servicing Agreement
provide that any advance of the kind described in the preceding paragraph may be
reimbursed to the  related Servicer or  the Master Servicer  or the Trustee,  as
applicable,  at any time from funds  available in the Servicer Custodial Account
or the Certificate  Account, as the  case may be,  to the extent  that (i)  such
funds  represent receipts on, or  liquidation, insurance, purchase or repurchase
proceeds in respect of, the Mortgage Loans to which the advance relates or  (ii)
the  Servicer, the Master Servicer or  Trustee, as applicable, has determined in
good faith that the advancing party will be unable to recover such advance  from
funds of the type referred to in clause (i) above.
 
RESTRICTIONS ON TRANSFER OF THE CLASS A-R, CLASS A-LR, CLASS M AND OFFERED CLASS
B CERTIFICATES
 
    The  Class A-R and Class A-LR Certificates  will be subject to the following
restrictions on transfer,  and each of  the Class A-R  and Class LR  Certificate
will contain a legend describing such restrictions.
 
    The  REMIC provisions of the Code impose certain taxes on (i) transferors of
residual interests to, or agents that  acquire residual interests on behalf  of,
Disqualified Organizations and (ii) certain Pass-Through Entities (as defined in
the  Prospectus) that have  Disqualified Organizations as  beneficial owners. No
tax will be imposed on  a Pass-Through Entity with respect  to the Class A-R  or
Class A-LR Certificate to the extent it has received an affidavit from the owner
thereof  that such owner is  not a Disqualified Organization  or a nominee for a
Disqualified Organization. The Pooling and Servicing Agreement will provide that
no legal or beneficial interest in the  Class A-R or Class A-LR Certificate  may
be  transferred  to or  registered  in the  name of  any  person unless  (i) the
proposed purchaser  provides to  the Trustee  an affidavit  (or, to  the  extent
acceptable  to  the Trustee,  a representation  letter  signed under  penalty of
perjury) to  the  effect that,  among  other items,  such  transferee is  not  a
Disqualified  Organization (as defined in the  Prospectus) and is not purchasing
the Class  A-R  or  Class  A-LR  Certificate as  an  agent  for  a  Disqualified
Organization  (I.E., as a broker, nominee,  or other middleman thereof) and (ii)
the transferor states in writing to the Trustee that it has no actual  knowledge
that  such affidavit  is false. Further,  such affidavit or  letter requires the
transferee to affirm that it  (i) historically has paid  its debts as they  have
come  due and intends to do so in the future, (ii) understands that it may incur
tax liabilities  with respect  to the  Class A-R  or Class  A-LR Certificate  in
excess  of cash flows  generated thereby, (iii) intends  to pay taxes associated
with holding the Class A-R  or Class A-LR Certificate  as such taxes become  due
and (iv) will not transfer the Class A-R or Class A-LR Certificate to any person
or  entity that does not provide a similar affidavit (or letter). The transferor
must certify in writing to the Trustee that, as of the date of the transfer,  it
had  no knowledge or reason to know that the affirmations made by the transferee
pursuant to the preceding sentence were false.
 
    In addition, the Class A-R and Class A-LR Certificates may not be  purchased
by  or transferred to  any person that is  not a "U.S.  Person," unless (i) such
person holds such  Class A-R or  Class A-LR Certificate  in connection with  the
conduct  of  a trade  or business  within  the United  States and  furnishes the
transferor and the Trustee with an effective Internal Revenue Service Form  4224
or  (ii)  the transferee  delivers to  both  the transferor  and the  Trustee an
opinion of a nationally recognized tax counsel to the effect that such  transfer
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. The term
"U.S. Person" means a citizen or  resident of the United States, a  corporation,
partnership  or other entity  created or organized  in or under  the laws of the
United States or any political subdivision  thereof, or an estate or trust  that
is subject to U.S. federal income tax regardless of the source of its income.
 
    The  Pooling  and Servicing  Agreement will  provide  that any  attempted or
purported transfer in violation of these transfer restrictions will be null  and
void and will vest no rights in any purported
 
                                      S-64
<PAGE>
transferee.  Any transferor or agent to whom the Trustee provides information as
to any applicable tax  imposed on such  transferor or agent  may be required  to
bear  the cost of computing or  providing such information. See "Certain Federal
Income  Tax  Consequences   --  Federal  Income   Tax  Consequences  for   REMIC
Certificates -- Taxation of Residual Certificates -- Tax-Related Restrictions on
Transfer of Residual Certificates" in the Prospectus.
 
    NEITHER  THE CLASS  A-R CERTIFICATE  NOR THE  CLASS A-LR  CERTIFICATE MAY BE
PURCHASED BY OR TRANSFERRED TO A PLAN. See "ERISA Considerations" herein and  in
the Prospectus.
 
    Because the Class M and Offered Class B Certificates are subordinated to the
Class  A Certificates, the Class  M and Offered Class  B Certificates may not be
transferred unless the transferee has  delivered (i) a representation letter  to
the  Trustee and the Seller 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 the conditions described herein, that the source
of  funds used  to purchase the  Class M or  Offered Class B  Certificates is an
"insurance company general account" or (ii)  an opinion of counsel as  described
herein  under "ERISA Considerations."  See "ERISA Considerations"  herein and in
the Prospectus.
 
REPORTS
 
    In addition to the applicable  information specified in the Prospectus,  the
Master  Servicer will cause to be included in the statement delivered to holders
of Class A, Class M and Class  B Certificates with respect to each  Distribution
Date the following information: (i) the amount of such distribution allocable to
interest,  the amount  of interest currently  distributable to  each Subclass of
Class A and Class B  Certificates and to the Class  M Certificates, any Class  A
Subclass Interest Shortfall Amount or Class B Subclass Interest Shortfall Amount
arising  with respect to each Subclass or  any Class M Interest Shortfall Amount
on such  Distribution  Date, any  remaining  unpaid Class  A  Subclass  Interest
Shortfall  Amount or Class B Subclass  Interest Shortfall Amount with respect to
each Subclass or any remaining unpaid  Class M Interest Shortfall Amount,  after
giving  effect to such distribution and  any Non-Supported Interest Shortfall or
the interest portion of Realized Losses allocable to such Subclass or Class with
respect to  such  Distribution  Date,  (ii)  the  amount  of  such  distribution
allocable  to  principal,  (iii)  the  Class  A  Non-PO  Principal  Balance, the
Component Principal Balance  of the  Class A-12  TAC Accrual  Component and  the
Class  A-12 PO Component, the  Class M Principal Balance,  the Class B Principal
Balance, the Class  A Subclass  Principal Balance of  each Subclass  of Class  A
Certificates  and the  Class B  Subclass Principal  Balance of  each Subclass of
Class B Certificates  in each case  after giving effect  to the distribution  of
principal and the allocation of the principal portion of Realized Losses to such
Subclass,  Class or Component  with respect to such  Distribution Date, (iv) the
Adjusted Pool  Amount,  the Adjusted  Pool  Amount  (PO Portion)  and  the  Pool
Scheduled  Principal Balance of  the Mortgage Loans  and the aggregate Scheduled
Principal Balance of the Discount Mortgage Loans for such Distribution Date, (v)
the Class A Percentage, the Class M Percentage and Subclass B Percentage of each
Subclass of Class B  Certificates 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 that  are
applied  during such Unscheduled Principal Receipt  Period), and (vi) the amount
of the  remaining Special  Hazard Loss  Amount, the  Fraud Loss  Amount and  the
Bankruptcy  Loss Amount as of  the close of business  on such Distribution Date.
See "Servicing of the  Mortgage Loans -- Reports  to Certificateholders" in  the
Prospectus.
 
    Copies  of the foregoing  reports are available upon  written request to the
Trust Administrator at its  corporate trust office.  See "Pooling and  Servicing
Agreement -- Trustee" herein.
 
SUBORDINATION OF CLASS M AND CLASS B CERTIFICATES
 
    The   rights  of  the  holders  of  the  Class  M  Certificates  to  receive
distributions with respect  to the Mortgage  Loans in the  Trust Estate will  be
subordinated  to such  rights of  the holders of  the Class  A Certificates, the
rights of the holders of the Class B Certificates to receive distributions  with
respect  to the Mortgage Loans in the  Trust Estate will be subordinated to such
rights of the holders of the Class  A Certificates and the Class M  Certificates
and  the rights of  the holders of  the Subclasses of  Class B Certificates with
higher numerical  designations  to receive  distributions  with respect  to  the
 
                                      S-65
<PAGE>
Mortgage  Loans in the Trust  Estate will be subordinated  to such rights of the
holders of Subclasses of Class B Certificates with lower numerical designations,
all to the extent described below. This subordination is intended to enhance the
likelihood of timely receipt by the holders of the Class A Certificates (to  the
extent  of  the subordination  of the  Class  M and  Class B  Certificates), the
holders of the Class M Certificates (to  the extent of the subordination of  the
Class  B Certificates) and the holders of a Subclass of Class B Certificates (to
the extent  of the  subordination of  Subclasses of  Class B  Certificates  with
higher  numerical designations)  of the full  amount of  their scheduled monthly
payments of interest  and principal and  to afford  the holders of  the Class  A
Certificates  (to the  extent of the  subordination of  the Class M  and Class B
Certificates), the holders  of the Class  M Certificates (to  the extent of  the
subordination  of the Class B Certificates) and the holders of the Subclasses of
Class B Certificates (to the extent of the subordination of Subclasses of  Class
B  Certificates with higher numerical  designations) protection against Realized
Losses, as more  fully described  below. If  Realized Losses  exceed the  credit
support  provided through subordination to the Class A Certificates, the Class M
Certificates or a Subclass of Class  B Certificates or if Excess Special  Hazard
Losses,  Excess Fraud Losses or Excess Bankruptcy Losses occur, all or a portion
of such  losses  will  be  borne  by the  Class  A  Certificates,  the  Class  M
Certificates or such Subclass of Class B Certificates.
 
    The  protection afforded to the holders of  Class A Certificates by means of
the subordination feature will be accomplished by the preferential right of such
holders to receive, prior to any distribution being made on a Distribution  Date
in respect of the Class M and Class B Certificates, the amounts of principal and
interest due the Class A Certificateholders on each Distribution Date out of the
Pool  Distribution Amount with  respect to such  date and, if  necessary, by the
right of such holders to receive future distributions on the Mortgage Loans that
would otherwise  have  been payable  to  the holders  of  Class M  and  Class  B
Certificates.  The application  of this  subordination to  cover Realized Losses
experienced in periods  prior to  the periods  in which  a Subclass  of Class  A
Certificates is entitled to distributions in reduction of principal balance will
decrease the protection provided by the subordination to any such Subclass.
 
    The  protection afforded to the holders of  Class M Certificates by means of
the subordination feature will be accomplished by the preferential right of such
holders to receive, prior to any distribution being made on a Distribution  Date
in respect of the Class B Certificates, the amounts of principal (other than any
amount used to pay the Class A-12 PO Component Deferred Amount) and interest due
the  Class  M  Certificateholders  on  each  Distribution  Date  from  the  Pool
Distribution Amount with respect  to such date (after  all required payments  on
the Class A Certificates have been made) and, if necessary, by the right of such
holders  to  receive  future  distributions on  the  Mortgage  Loans  that would
otherwise have been payable to the holders of the Class B Certificates.
 
    A Subclass of Class  B Certificates will be  entitled, on each  Distribution
Date,  to the  remaining portion,  if any,  of the  applicable Pool Distribution
Amount, after payment of the Class A Optimal Amount, the Class A-12 PO Component
Deferred Amount, the Class M Optimal Amount and the Subclass B Optimal Amount of
each Subclass of  Class B Certificates  with a lower  numerical designation  for
such  date. Amounts  so distributed  to Class  B Certificateholders  will not be
available to cover  delinquencies or  Realized Losses in  respect of  subsequent
Distribution Dates.
 
    ALLOCATION OF LOSSES
 
    Realized  Losses  (other than  Excess  Special Hazard  Losses,  Excess Fraud
Losses or Excess Bankruptcy Losses) will not be allocated to the holders of  the
Class A Certificates until the date on which the amount of principal payments on
the  Mortgage Loans  to which the  holders of the  Subordinated Certificates are
entitled has been reduced to zero as a result of the allocation of losses to the
Subordinated Certificates, I.E., the date  on which the Subordinated  Percentage
has  been reduced  to zero  (the "Cross-Over  Date"). Prior  to such  time, such
Realized Losses will  be allocated  to the  Subclasses of  Class B  Certificates
sequentially  in reverse numerical  order, until the  Class B Subclass Principal
Balance of each such Subclass has been reduced to zero, and then to the Class  M
Certificates until the Class M Principal Balance has been reduced to zero.
 
    The  allocation of the  principal portion of  a Realized Loss  (other than a
Debt Service Reduction, Excess Special Hazard Loss, Excess Fraud Loss or  Excess
Bankruptcy Loss) will be effected through
 
                                      S-66
<PAGE>
the adjustment of the principal balance of the most subordinate Class (or in the
case  of the Subclasses of Class  B Certificates, the most subordinate Subclass)
then outstanding in such amount as is necessary to cause the sum of the Class  A
Subclass  Principal  Balances, the  Class M  Principal Balance  and the  Class B
Subclass Principal Balances to equal the Adjusted Pool Amount.
 
    Allocations to  the  Class M  Certificates  or  the Subclasses  of  Class  B
Certificates  of (i) the principal portion  of Debt Service Reductions, (ii) the
interest portion of Realized  Losses (other than  Excess Special Hazard  Losses,
Excess Fraud Losses and Excess Bankruptcy Losses), (iii) any interest shortfalls
resulting  from delinquencies for which the Servicer, the Master Servicer or the
Trustee does not advance, (iv) any interest shortfalls or losses resulting  from
the  application of the Soldiers' and Sailors' Civil Relief Act of 1940, as more
fully described under "Certain Legal Aspects of the Mortgage Loans --  Soldiers'
and Sailors' Civil Relief Act" in the Prospectus and (v) any interest shortfalls
resulting  from  the timing  of the  receipt  of Unscheduled  Principal Receipts
(other than Prepayments in Full) with respect to Mortgage Loans will result from
the priority  of distributions  of the  Pool Distribution  Amount first  to  the
holders  of the  Class A  Certificates, second to  the Class  M Certificates and
finally to  the  Subclasses  of  Class B  Certificates  in  numerical  order  as
described above under "-- Distributions."
 
    The allocation of the principal portion of Realized Losses in respect of the
Mortgage  Loans  allocated on  or  after the  Cross-Over  Date will  be effected
through the adjustment on any Determination Date of the Class A Non-PO Principal
Balance and the Component Principal Balance of the Class A-12 PO Component  such
that  (i) the Class A  Non-PO Principal Balance equals  the Adjusted Pool Amount
less the Adjusted Pool Amount (PO Portion) as of the preceding Distribution Date
and (ii) the Component Principal Balance  of the Class A-12 PO Component  equals
the Adjusted Pool Amount (PO Portion) as of the preceding Distribution Date. The
principal  portion of such Realized Losses allocated to the Class A Certificates
(other than  the  Class  A-12  Certificates) and  the  Class  A-12  TAC  Accrual
Component   will  be  allocated  to  such  outstanding  Subclasses  of  Class  A
Certificates and  such Component  pro  rata in  accordance  with their  Class  A
Subclass  Principal Balances or  Component Principal Balance or,  in the case of
the Class  A-11 Certificates  and  the Class  A-12  TAC Accrual  Component,  the
initial  Class A Subclass  Principal Balance or  the initial Component Principal
Balance, as the case may be, if lower. The interest portion of any Realized Loss
allocated  on  or  after  the  Cross-Over  Date  will  be  allocated  among  the
outstanding Subclasses of Class A Certificates pro rata in accordance with their
respective  Class A  Subclass Interest  Accrual Amounts,  without regard  to any
reduction pursuant to  this sentence.  Any amount  allocated to  the Class  A-12
Certificates  will be allocated among the  Class A-12 Components (other than the
Class A-12 PO Component) pro rata in accordance with their respective  Component
Interest  Accrual  Amounts, without  regard to  any  reduction pursuant  to this
sentence. Any  such losses  will  be allocated  among  the outstanding  Class  A
Certificates  within each Subclass pro rata  in accordance with their respective
Percentage Interests.
 
    Any Excess Special Hazard Losses,  Excess Fraud Losses or Excess  Bankruptcy
Losses  will be  allocated (i)  with respect  to the  principal portion  of such
losses (a) to the outstanding Subclasses of the Class A Certificates (other than
the Class A-12 Certificates  with respect to the  Class A-12 PO Component),  the
Class  M  Certificates and  the Class  B  Certificates pro  rata based  on their
outstanding principal  balances in  proportion to  the Non-PO  Fraction of  such
losses  and (b)  in respect  of Discount  Mortgage Loans,  to the  Class A-12 PO
Component in proportion to the PO Fraction of such losses and (ii) with  respect
to  the interest portion  of such losses,  to the Class  A, Class M  and Class B
Certificates pro rata based  on the interest accrued.  The principal portion  of
any  such losses so allocated to the  Class A Certificates (other than the Class
A-12 Certificates with respect to the Class A-12 PO Component) will be allocated
among the outstanding Subclasses of Class  A Certificates (other than the  Class
A-12  Certificates)  and  the  Class  A-12 TAC  Accrual  Component  pro  rata in
accordance with their  then-outstanding Class A  Subclass Principal Balances  or
Component  Principal Balance, or, in the case of the Class A-11 certificates and
the Class A-12  TAC Accrual Component,  the initial Class  A Subclass  Principal
Balance  or the  initial Component  Principal Balance,  as the  case may  be, if
lower, and the interest portion of any  such losses will be allocated among  the
outstanding   Subclasses  of  Class  A   Certificates  (other  than  Class  A-12
Certificates) and the Class A-12 Components (other than
 
                                      S-67
<PAGE>
the Class A-12 PO Component) in accordance with their Class A Subclass  Interest
Accrual  Amounts and Component  Interest Accrual Amounts,  without regard to any
reduction  pursuant  to  this  sentence,  and  among  the  outstanding  Class  A
Certificates  within each Subclass pro rata  in accordance with their respective
Percentage Interests.
 
    The interest portion of  Excess Special Hazard  Losses, Excess Fraud  Losses
and  Excess Bankruptcy Losses will be allocated by reducing the Class A Subclass
Interest Accrual Amounts, Class M Interest  Accrual Amount and Class B  Subclass
Interest Accrual Amounts.
 
    As  described above, the Pool Distribution  Amount for any Distribution Date
will include  current  receipts  (other than  certain  unscheduled  payments  in
respect  of principal) from  the Mortgage Loans otherwise  payable to holders of
the Class M and  Class B Certificates.  If the Pool  Distribution Amount is  not
sufficient  to cover the amount of principal payable to the holders of the Class
A Certificates  on  a  particular  Distribution Date,  then  the  percentage  of
principal  payments on the  Mortgage Loans to  which the holders  of the Class A
Certificates (other  than  the  Class  A-12 Certificates)  and  the  Class  A-12
Certificates  to the  extent of  the Class  A-12 TAC  Accrual Component  will be
entitled (I.E., the Class A Percentage) on and after the next Distribution  Date
will  be proportionately increased, thereby reducing,  as a relative matter, the
respective interest of the Class M  and Class B Certificates in future  payments
of  principal on the Mortgage Loans in  the Trust Estate. Such a shortfall could
occur, for example, if  a considerable number of  Mortgage Loans were to  become
Liquidated Loans in a particular month.
 
    Special  Hazard Losses,  other than  Excess Special  Hazard Losses,  will be
allocated solely to the Subclasses of Class B Certificates in reverse  numerical
order  or, following  the reduction  of the Class  B Principal  Balance to zero,
solely to  the Class  M Certificates.  Special Hazard  Losses in  excess of  the
Special  Hazard Loss Amount  are "Excess Special  Hazard Losses." Excess Special
Hazard Losses will be allocated among  (i) the Class A Certificates (other  than
the  Class  A-12  PO  Component),  the Class  M  Certificates  and  the  Class B
Certificates and (ii) to the extent such Excess Special Hazard Losses arise with
respect to  Discount  Mortgage  Loans,  the Class  A-12  PO  Component.  If  the
aggregate of all Special Hazard Losses incurred in the month preceding the month
of the related Distribution Date (the "Aggregate Current Special Hazard Losses")
is  less than  or equal  to the then-applicable  Special Hazard  Loss Amount, no
Special Hazard  Losses will  be regarded  as Excess  Special Hazard  Losses.  If
Aggregate  Current  Special  Hazard Losses  exceed  the  then-applicable Special
Hazard Loss Amount, a portion of each Special Hazard Loss will be regarded as an
"Excess Special Hazard Loss" in proportion to the ratio of (a) the excess of (i)
Aggregate Current Special  Hazard Losses over  (ii) the then-applicable  Special
Hazard  Loss  Amount,  to  (b)  the  Aggregate  Current  Special  Hazard Losses.
Thereafter, when the  Special Hazard  Loss Amount  is zero,  all Special  Hazard
Losses  will be regarded as Excess  Special Hazard Losses. Upon initial issuance
of the Series 1996-4 Certificates, the "Special Hazard Loss Amount" with respect
thereto will be equal to  approximately 1.02% (approximately $3,898,940) of  the
Cut-Off  Date  Aggregate Principal  Balance  of the  Mortgage  Loans. As  of any
Distribution Date, the Special Hazard Loss Amount will equal the initial Special
Hazard Loss  Amount less  the sum  of (A)  any Special  Hazard Losses  allocated
solely to the Class B or Class M Certificates and (B) the Adjustment Amount. The
"Adjustment Amount" on each anniversary of the Cut-Off Date will be equal to the
amount, if any, by which the Special Hazard Amount, without giving effect to the
deduction  of the Adjustment Amount for such anniversary, exceeds the greater of
(i) 1.00% (or, if greater than  1.00%, the highest percentage of Mortgage  Loans
by  principal balance in any California  zip code) times the aggregate principal
balance of all the Mortgage Loans  on such anniversary (ii) twice the  principal
balance  of the single  Mortgage Loan having the  largest principal balance, and
(iii) that which is necessary to maintain  the original ratings on the Class  A,
Class M and Offered Class B Certificates, as evidenced by letters to that effect
delivered  by Fitch and S&P to the Master Servicer and the Trustee. On and after
the Cross-Over Date, the Special Hazard Loss Amount will be zero.
 
    Fraud Losses, other than  Excess Fraud Losses, will  be allocated solely  to
the  Subclasses of Class B Certificates in reverse numerical order or, following
the reduction of the Class  B Principal Balance to zero,  solely to the Class  M
Certificates.  Fraud  Losses in  excess  of the  Fraud  Loss Amount  are "Excess
 
                                      S-68
<PAGE>
Fraud Losses."  Excess Fraud  Losses will  be allocated  among (i)  the Class  A
Certificates  (other than the Class A-12 PO Component), the Class M Certificates
and the Class B  Certificates and (ii)  to the extent  such Excess Fraud  Losses
arise  with respect to Discount Mortgage Loans,  the Class A-12 PO Component. If
the aggregate of all Fraud Losses incurred  in the month preceding the month  of
the  related Distribution  Date (the "Aggregate  Current Fraud  Losses") is less
than or equal to the then-applicable Fraud Loss Amount, no Fraud Losses will  be
regarded  as Excess Fraud  Losses. If Aggregate Current  Fraud Losses exceed the
then-applicable Fraud Loss Amount, a portion of each Fraud Loss will be regarded
as an "Excess Fraud Loss"  in proportion to the ratio  of (a) the excess of  (i)
Aggregate  Current Fraud Losses over (ii) the then-applicable Fraud Loss Amount,
to (b)  the Aggregate  Current Fraud  Losses. Thereafter,  when the  Fraud  Loss
Amount  is zero, all Fraud Losses will  be regarded as Excess Fraud Losses. Upon
initial issuance of the Series 1996-4 Certificates, the "Fraud Loss Amount" with
respect thereto will be equal to approximately 2.00% (approximately  $7,663,629)
of the Cut-Off Date Aggregate Principal Balance of the Mortgage Loans. As of any
Distribution  Date prior to the first anniversary of the Cut-Off Date, the Fraud
Loss Amount will equal the initial Fraud Loss Amount minus the aggregate  amount
of  Fraud Losses allocated solely to the Class B or Class M Certificates through
the related  Determination Date.  As of  any Distribution  Date from  the  first
through  fifth anniversary of the Cut-Off Date, the Fraud Loss Amount will be 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 principal
balance of all of the  Mortgage Loans as of the  most recent anniversary of  the
Cut-Off  Date minus (2) the aggregate amounts allocated solely to the Class B or
Class M  Certificates  with  respect  to Fraud  Losses  since  the  most  recent
anniversary  of the Cut-Off Date through  the related Determination Date. On and
after the Cross-Over Date  or after the fifth  anniversary of the Cut-Off  Date,
the Fraud Loss Amount will be zero.
 
    Bankruptcy  Losses, other than  Excess Bankruptcy Losses,  will be allocated
solely to the Subclasses of Class B Certificates in reverse numerical order  or,
following  the reduction of the Class B Principal Balance to zero, solely to the
Class M Certificates. Bankruptcy losses in excess of the Bankruptcy Loss  Amount
are "Excess Bankruptcy Losses." Excess Bankruptcy Losses will be allocated among
(i) the Class A Certificates (other than the Class A-12 PO Component), the Class
M  Certificates and the Class B Certificates  and (ii) to the extent such Excess
Bankruptcy Losses arise with respect to Discount Mortgage Loans, the Class  A-12
PO  Component. If the aggregate  of all Bankruptcy Losses  incurred in the month
preceding the month  of the  related Distribution Date  (the "Aggregate  Current
Bankruptcy Losses") is less than or equal to the then applicable Bankruptcy Loss
Amount,  no Bankruptcy Losses  will be regarded as  Excess Bankruptcy Losses. If
Aggregate Current Bankruptcy Losses  exceed the then-applicable Bankruptcy  Loss
Amount,  a  portion of  each  Bankruptcy Loss  will  be regarded  as  an "Excess
Bankruptcy Loss" in proportion to the ratio  of (a) the excess of (i)  Aggregate
Current  Bankruptcy Losses over (ii) the then-applicable Bankruptcy Loss Amount,
to (b) the Aggregate Current Bankruptcy Losses. Thereafter, when the  Bankruptcy
Loss Amount is zero, all Bankruptcy Losses will be regarded as Excess Bankruptcy
Losses. Upon initial issuance of the Series 1996-4 Certificates, the "Bankruptcy
Loss  Amount"  with  respect  thereto  will  be  equal  to  approximately  0.04%
(approximately $150,000) of the Cut-Off Date Aggregate Principal Balance of  the
Mortgage  Loans. As of any  Distribution Date prior to  the first anniversary of
the Cut-Off Date, the Bankruptcy Loss  Amount will equal the initial  Bankruptcy
Loss  Amount minus the aggregate amount of Bankruptcy Losses allocated solely to
the Class B or Class M  Certificates through the related Determination Date.  As
of  any Distribution Date on or after the first anniversary of the Cut-Off Date,
the Bankruptcy Loss Amount will equal the  excess, if any, of (1) the lesser  of
(a)  the Bankruptcy Loss Amount  as of the business  day next preceding the most
recent anniversary of  the Cut-Off Date  and (b) an  amount, if any,  calculated
pursuant  to the terms of  the Pooling and Servicing  Agreement, which amount as
calculated will provide for a reduction in the Bankruptcy Loss Amount, over  (2)
the  aggregate amount of  Bankruptcy Losses allocated  solely to the  Class B or
Class M Certificates since such anniversary. The Bankruptcy Loss Amount and  the
related  coverage levels described above may be reduced or modified upon written
confirmation from Fitch  and S&P that  such reduction or  modification will  not
adversely   affect   the  then-current   ratings  assigned   to  the   Class  A,
 
                                      S-69
<PAGE>
and Class M Certificates by Fitch and S&P and the then-current ratings  assigned
to  the Offered Class B Certificates by  Fitch. Such a reduction or modification
may adversely  affect the  coverage provided  by subordination  with respect  to
Bankruptcy  Losses. On and after the Cross-Over Date, the Bankruptcy Loss Amount
will be zero.
 
    Notwithstanding the foregoing, the provisions relating to subordination will
not be applicable in connection with a Bankruptcy Loss so long as the applicable
Servicer has notified the Trustee and  the Master Servicer 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
when (A) the related Mortgage Loan is not in default with regard to the payments
due  thereunder or (B)  delinquent payments of principal  and interest under the
related Mortgage  Loan  and  any  premiums on  any  applicable  Standard  Hazard
Insurance  Policy and  any related escrow  payments in respect  of such Mortgage
Loan are being  advanced on a  current basis  by such Servicer,  in either  case
without giving effect to any Debt Service Reduction.
 
    Since  the aggregate initial  principal balance of  the Class M  and Class B
Certificates will  be  approximately $22,991,621,  the  risk of  Special  Hazard
Losses, Fraud Losses and Bankruptcy Losses will be separately borne by the Class
B  Certificates and, after the principal balance of the Class B Certificates has
been reduced to zero, by the Class M Certificates to a lesser extent (I.E., only
up to the  Special Hazard  Loss Amount, Fraud  Loss Amount  and Bankruptcy  Loss
Amount,  respectively) than  the risk  of other  Realized Losses,  which will be
allocated first to the Class B Certificates and then the Class M Certificates to
the full extent of their initial  principal balances. See "The Trust Estates  --
Mortgage  Loans -- Representations and  Warranties" and "-- Insurance Policies,"
"Certain Legal Aspects  of the Mortgage  Loans -- Environmental  Considerations"
and  "Servicing of  the Mortgage  Loans --  Enforcement of  Due-on-Sale Clauses;
Realization Upon Defaulted Mortgage Loans" in the Prospectus.
 
                                      S-70
<PAGE>
                      DESCRIPTION OF THE MORTGAGE LOANS(1)
 
GENERAL
 
    The Mortgage Loans to be included in the Trust Estate will be fixed interest
rate,   conventional,  monthly  pay,  fully  amortizing,  one-  to  four-family,
residential first  mortgage  loans  having original  terms  to  stated  maturity
ranging from approximately 20 to approximately 30 years, which may include loans
secured  by  shares  ("Co-op  Shares")  issued  by  private  non-profit  housing
corporations ("Cooperatives"), and the  related proprietary leases or  occupancy
agreements   granting  exclusive  rights  to  occupy  specified  units  in  such
Cooperatives' buildings.  The  Mortgage  Loans are  expected  to  include  1,357
promissory  notes,  to have  an  aggregate unpaid  principal  balance as  of the
Cut-Off Date (the "Cut-Off Date  Aggregate Principal Balance") of  approximately
$383,181,431  to  be  secured  by  first  liens  (the  "Mortgages")  on  one- to
four-family residential properties (the "Mortgaged Properties") and to have  the
additional characteristics described below and in the Prospectus.
 
    As  of the Cut-Off Date, it is expected that 13 of the Mortgage Loans in the
Trust Estate, representing  approximately 0.20%  of the  Cut-Off Date  Aggregate
Principal Balance of the Mortgage Loans will be secured by Co-op Shares and that
three  of the  Mortgage Loans, representing  approximately 0.17%  of the Cut-Off
Date Aggregate Principal Balance of the Mortgage Loans, will be Buy-Down  Loans.
It  is expected that none of the Mortgage  Loans will be Subsidy Loans. See "The
Trust Estates -- Mortgage Loans" in the Prospectus.
 
    Each of the Mortgage Loans is subject to a due-on-sale clause. See  "Certain
Legal  Aspects of the Mortgage Loans -- "Due-on-Sale' Clauses" and "Servicing of
the Mortgage  Loans  -- Enforcement  of  Due-on-Sale Clauses;  Realization  Upon
Defaulted Mortgage Loans" in the Prospectus.
 
    As  of the Cut-Off  Date, each Mortgage  Loan is expected  to have an unpaid
principal  balance  of  not  less  than  approximately  $31,834  or  more   than
approximately  $1,949,470,  and  the  average unpaid  principal  balance  of the
Mortgage Loans  is expected  to  be approximately  $282,374. The  latest  stated
maturity  date of any  of the Mortgage Loans  is expected to  be August 1, 2026;
however, the actual  date on  which any  Mortgage Loan is  paid in  full may  be
earlier  than the stated maturity date due to unscheduled payments of principal.
Based on information supplied  by the mortgagors in  connection with their  loan
applications  at origination,  1,301 of  the Mortgaged  Properties, which secure
approximately 96.31%  of the  Cut-Off Date  Aggregate Principal  Balance of  the
Mortgage Loans, are expected to be owner occupied
 
- ------------------------
(1) The  descriptions in this Prospectus Supplement  of the Trust Estate and the
    properties securing the Mortgage  Loans to be included  in the Trust  Estate
    are  based upon  the expected characteristics  of the Mortgage  Loans at the
    close of  business  on the  Cut-Off  Date,  as adjusted  for  the  scheduled
    principal   payments  due  on  or  before  such  date.  Notwithstanding  the
    foregoing, any of such Mortgage Loans may be excluded from the Trust  Estate
    (i)  as a result  of principal prepayment thereof  in full or  (ii) if, as a
    result of  delinquencies  or  otherwise, the  Seller  otherwise  deems  such
    exclusion  necessary or desirable. In either event, other Mortgage Loans may
    be included in the  Trust Estate. The Seller  believes that the  information
    set  forth  herein  with  respect to  the  expected  characteristics  of the
    Mortgage Loans on the Cut-Off Date is representative of the  characteristics
    as  of the Cut-Off  Date of the Mortgage  Loans to be  included in the Trust
    Estate as it will be constituted at the time the Series 1996-4  Certificates
    are issued, although the Cut-Off Date Aggregate Principal Balance, the range
    of Mortgage Interest Rates and maturities, and certain other characteristics
    of the Mortgage Loans in the Trust Estate may vary. In the event that any of
    the  characteristics  as of  the  Cut-Off Date  of  the Mortgage  Loans that
    constitute the Trust Estate  on the date of  initial issuance of the  Series
    1996-4  Certificates vary  materially from  those described  herein, revised
    information  regarding  the  Mortgage  Loans  will  be  made  available   to
    purchasers of the Offered Certificates, on or before such issuance date, and
    a  Current Report on Form 8-K containing such information will be filed with
    the Securities and Exchange Commission within 15 days following such date.
 
                                      S-71
<PAGE>
primary residences, 56 of the  Mortgaged Properties, which secure  approximately
3.69% of the Cut-Off Date Aggregate Principal Balance of the Mortgage Loans, are
expected  to be second homes.  See "The Mortgage Loan  Programs -- Mortgage Loan
Underwriting" in the Prospectus.
 
    As of the  Cut-Off Date, there  were 408 Discount  Mortgage Loans having  an
aggregate  unpaid principal  balance of  approximately $126,838,633,  a range of
unpaid principal balances of approximately $66,290 to approximately  $1,949,470,
an  average  unpaid  principal balance  of  approximately $310,879,  a  range of
Mortgage Interest Rates  from 6.875%  to 8.000%  per annum,  a weighted  average
Mortgage  Interest Rate of approximately 7.721%  per annum, a range of remaining
terms to  stated  maturity of  234  months to  360  months, a  weighted  average
remaining  term  to stated  maturity  of approximately  354  months, a  range of
original Loan-to-Value Ratios of 25.88%  to 95.00%, a weighted average  original
Loan-to-Value  Ratio  of  approximately  75.34%  and  the  following  geographic
concentration of Mortgaged Properties securing Mortgage Loans in excess of 5.00%
of the  aggregate  unpaid principal  balance  of the  Discount  Mortgage  Loans:
approximately  23.02% in California, 13.90% in  Georgia, 9.74% in Florida, 7.61%
in New York, 6.72% in Virginia, 6.10% in New Jersey and 5.46% in Maryland.
 
    As of the Cut-Off Date, there were 949 Mortgage Loans that were not Discount
Mortgage Loans  (the  "Premium  Mortgage  Loans")  having  an  aggregate  unpaid
principal  balance of  approximately $256,342,798,  a range  of unpaid principal
balances of approximately $31,834 to approximately $1,000,000, an average unpaid
principal balance of approximately $270,119, a range of Mortgage Interest  Rates
from  8.125% to 10.000% per annum, a  weighted average Mortgage Interest Rate of
approximately 8.595% per annum, a range of remaining terms to stated maturity of
237 months to 360 months, a  weighted average remaining term to stated  maturity
of  approximately 357 months, a range of original Loan-to-Value Ratios of 17.39%
to 95.04%,  a weighted  average original  Loan-to-Value Ratio  of  approximately
77.76%  and  the  following  geographic  concentration  of  Mortgaged Properties
securing Mortgage Loans  in excess of  5.00% of the  aggregate unpaid  principal
balance  of the Mortgage Loans other than Discount Mortgage Loans: approximately
31.87% in  California, 9.42%  in New  York, 7.55%  in New  Jersey and  5.06%  in
Florida.
 
    The  Mortgage  Loans will  have  been acquired  by  the Seller  from Norwest
Mortgage. On May 7,  1996 Norwest Mortgage and  an affiliate acquired from  PHMC
certain  mortgage loans and  a substantial portion  of PHMC's mortgage servicing
portfolio  (such  transaction,  the  "PHMC  Acquisition").  The  Mortgage  Loans
included in the Trust Estate consist of (i) Mortgage Loans originated by Norwest
Mortgage  or an affiliate or purchased by  Norwest Mortgage or an affiliate from
originators other than PHMC and (ii)  Mortgage Loans originated or purchased  by
PHMC  and acquired by Norwest Mortgage or an  affiliate from PHMC as part of the
PHMC Acquisition. See "Norwest Mortgage"  in the Prospectus. The Mortgage  Loans
that  were not  originated by Norwest  Mortgage or acquired  by Norwest Mortgage
from PHMC  were  acquired by  Norwest  Mortgage  or an  affiliate  from  various
entities  (each, a "Norwest Correspondent") which either originated the Mortgage
Loans or acquired the Mortgage Loans pursuant to mortgage loan purchase programs
operated by such Norwest Correspondents. The Mortgage Loans acquired by  Norwest
Mortgage  from PHMC that were not originated  by PHMC were acquired by PHMC from
various entities  (each  a "PHMC  Correspondent")  which either  originated  the
Mortgage Loans or acquired the Mortgage Loans pursuant to mortgage loan purchase
programs  operated by such PHMC Correspondents. Approximately 88.79% (by Cut-Off
Date Aggregate  Principal Balance)  of  the Mortgage  Loans were  originated  in
conformity with the underwriting standards described in the Prospectus under the
heading  "The Mortgage  Loan Programs --  Mortgage Loan  Underwriting -- Norwest
Mortgage Underwriting" (the "Underwriting Standards") and as applied by  Norwest
Mortgage,  PHMC, or by eligible originators to whom Norwest Mortgage or PHMC had
delegated all underwriting  functions. In certain  instances, exceptions to  the
Underwriting Standards may have been granted by Norwest Mortgage or by PHMC. See
"The  Mortgage Loan Programs  -- Mortgage Loan  Underwriting" in the Prospectus.
The remaining approximate 11.21% (by  Cut-Off Date Aggregate Principal  Balance)
of  the Mortgage Loans  (the "Bulk Purchase Underwritten  Loans") will have been
underwritten  in  connection  with  bulk  purchase  transactions  under  varying
standards which have been
 
                                      S-72
<PAGE>
reviewed by Norwest Mortgage or PHMC, who determined that such varying standards
did  not depart materially from the  Underwriting Standards. Neither the Seller,
Norwest Mortgage nor PHMC has underwritten any of the Bulk Purchase Underwritten
Loans. Approximately 57.30% (by Cut-Off Date Aggregate Principal Balance) of the
Mortgage Loans were generally underwritten  in accordance with the  Underwriting
Standards  used by PHMC or the underwriting guidelines of the originators of the
Bulk  Purchase  Underwritten  Loans.  Approximately  42.70%  (by  Cut-Off   Date
Aggregate  Principal Balance) of the  Mortgage Loans were generally underwritten
in accordance with the Underwriting Standards used by Norwest Mortgage. See  "--
Mortgage  Underwriting  Standards"  below  and "The  Mortgage  Loan  Programs --
Mortgage Loan Underwriting" in the Prospectus.
 
MORTGAGE LOAN DATA
 
    Set  forth  below   is  a   description  of   certain  additional   expected
characteristics  of  the  Mortgage  Loans  as of  the  Cut-Off  Date  (except as
otherwise indicated).
 
                            MORTGAGE INTEREST RATES
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
                                     OF MORTGAGE      PRINCIPAL       PRINCIPAL
MORTGAGE INTEREST RATE                  LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
 6.875%............................        4       $  1,444,095.88        0.38   %
 7.000%............................        5          1,220,042.68        0.32
 7.125%............................        8          2,333,213.42        0.61
 7.250%............................       18          5,274,195.18        1.38
 7.375%............................       30          8,961,710.58        2.34
 7.500%............................       39         12,156,421.31        3.17
 7.625%............................       42         13,246,829.89        3.46
 7.750%............................       69         22,813,844.48        5.95
 7.875%............................      103         33,088,773.84        8.64
 8.000%............................       90         26,299,505.98        6.86
 8.125%............................       88         26,941,908.22        7.03
 8.250%............................      104         30,430,949.00        7.94
 8.375%............................      114         33,259,459.82        8.68
 8.500%............................      148         42,053,279.19       10.96
 8.625%............................      120         34,165,059.17        8.92
 8.750%............................      105         27,727,882.18        7.24
 8.875%............................       88         23,746,472.80        6.20
 9.000%............................       57         13,583,879.92        3.55
 9.125%............................       42          9,777,843.36        2.55
 9.250%............................       36          6,897,188.19        1.80
 9.375%............................       16          2,439,892.83        0.64
 9.500%............................       17          2,716,123.01        0.71
 9.625%............................        9          2,034,519.85        0.53
 9.750%............................        3            286,242.88        0.07
 10.000%...........................        2            282,097.33        0.07
                                       -----       ---------------     -------
        Total......................    1,357       $383,181,430.99      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    As of the Cut-Off Date, the  weighted average Mortgage Interest Rate of  the
Mortgage  Loans  is  expected to  be  approximately  8.306% per  annum.  The Net
Mortgage Interest  Rate of  each Mortgage  Loan will  be equal  to the  Mortgage
Interest  Rate  of  such Mortgage  Loan  minus  the sum  of  (a)  the applicable
Servicing Fee Rate  and (b)  the Master  Servicing Fee  Rate and  (c) the  Fixed
Retained  Yield, if  any, for such  Mortgage Loan.  As of the  Cut-Off Date, the
weighted average Net Mortgage Interest Rate of the Mortgage Loans is expected to
be approximately 7.651% per annum.
 
                                      S-73
<PAGE>
                       REMAINING TERMS TO STATED MATURITY
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
                                     OF MORTGAGE      PRINCIPAL       PRINCIPAL
REMAINING STATED TERM (MONTHS)          LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
234................................        1       $    254,015.97        0.07   %
235................................        2            499,134.79        0.13
236................................        1            281,766.15        0.07
237................................        3            889,865.79        0.23
238................................        2            570,051.84        0.15
239................................        4          1,133,865.02        0.30
240................................        1            249,950.00        0.07
277................................        1             94,498.58        0.02
298................................        1            379,276.03        0.10
302................................        3            208,809.52        0.05
303................................        2            125,193.19        0.03
304................................        2             99,760.70        0.03
305................................        3            172,388.43        0.04
306................................        1             44,284.52        0.01
309................................        1             47,285.89        0.01
317................................        1            245,612.29        0.06
321................................        1             77,264.34        0.02
323................................        1            216,146.57        0.06
326................................        1            243,478.25        0.06
327................................        1          1,949,470.00        0.51
336................................        1            222,672.73        0.06
340................................        1            202,097.33        0.05
344................................        1            469,849.93        0.12
347................................        2            567,936.32        0.15
348................................        7          1,619,195.30        0.42
349................................        8          1,739,682.97        0.45
350................................        5            790,191.83        0.21
351................................        8          1,278,957.83        0.33
352................................        5          1,539,350.55        0.40
353................................       13          5,020,500.38        1.31
354................................       20          5,203,209.63        1.36
355................................       68         18,911,040.86        4.94
356................................      183         55,648,119.68       14.52
357................................      164         50,826,241.94       13.26
358................................      324         91,643,194.26       23.92
359................................      383        105,724,721.58       27.61
360................................      131         33,992,350.00        8.87
                                       -----       ---------------     -------
        Total......................    1,357       $383,181,430.99      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    As of  the Cut-Off  Date,  the weighted  average  remaining term  to  stated
maturity of the Mortgage Loans is expected to be approximately 356 months.
 
                                      S-74
<PAGE>
                              YEARS OF ORIGINATION
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
                                     OF MORTGAGE      PRINCIPAL       PRINCIPAL
YEAR OF ORIGINATION                     LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
1989...............................        1       $     94,498.58        0.02   %
1991...............................       10            606,151.84        0.16
1992...............................        3            337,182.70        0.09
1993...............................        4          2,486,359.16        0.65
1994...............................        1            222,672.73        0.06
1995...............................       44         11,241,615.37        2.93
1996...............................    1,294        368,192,950.61       96.09
                                       -----       ---------------     -------
        Total......................    1,357       $383,181,430.99      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    It  is  expected that  the earliest  month  and year  of origination  of any
Mortgage Loan was September  1989 and the latest  month and year of  origination
was July 1996.
 
                         ORIGINAL LOAN-TO-VALUE RATIOS
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
                                     OF MORTGAGE      PRINCIPAL       PRINCIPAL
ORIGINAL LOAN-TO-VALUE RATIO            LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
50% or less........................       37       $ 13,126,809.43        3.43   %
50.01- 55.00%......................       32          8,756,371.92        2.29
55.01- 60.00%......................       38         10,889,927.28        2.84
60.01- 65.00%......................       67         20,468,243.43        5.34
65.01- 70.00%......................      113         33,831,085.28        8.83
70.01- 75.00%......................      167         49,514,193.47       12.92
75.01- 80.00%......................      562        156,285,069.94       40.78
80.01- 85.00%......................       28          7,584,463.38        1.98
85.01- 90.00%......................      233         62,919,587.13       16.42
90.01- 95.00%......................       79         19,575,352.08        5.11
95.01-100.00%......................        1            230,327.65        0.06
                                       -----       ---------------     -------
        Total......................    1,357       $383,181,430.99      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    As  of the  Cut-Off Date,  the minimum  and maximum  Loan-to-Value Ratios at
origination of  the  Mortgage  Loans  are expected  to  be  17.39%  and  95.04%,
respectively, and the weighted average Loan-to-Value Ratio at origination of the
Mortgage  Loans is expected to be  approximately 76.96%. The Loan-to-Value Ratio
of a Mortgage Loan is calculated using the lesser of (i) the appraised value  of
the  related Mortgaged Property, as established  by an appraisal obtained by the
originator from an appraiser at the time of origination and (ii) the sale  price
for  such property. See "The Trust Estates -- Mortgage Loans" in the Prospectus.
No assurance can be given that  the values of the Mortgaged Properties  securing
the  Mortgage  Loans  have  remained  or  will  remain  at  the  levels  used in
calculating the Loan-to-Value Ratios shown above. See "Risk Factors -- Risks  of
the  Mortgage Loans" in the  Prospectus. It is expected  that 30 of the Mortgage
Loans having Loan-to-Value Ratios at origination in excess of 80%,  representing
approximately  2.13%  (by  Cut-Off  Date  Aggregate  Principal  Balance)  of the
Mortgage Loans, were originated without primary mortgage insurance.
 
                                      S-75
<PAGE>
                       MORTGAGE LOAN DOCUMENTATION LEVELS
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
                                     OF MORTGAGE      PRINCIPAL       PRINCIPAL
DOCUMENTATION LEVEL                     LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Full Documentation.................    1,059       $323,486,848.79       84.43   %
Asset and Mortgage Verification....      226         39,935,272.48       10.42
Income and Mortgage Verification...        6          1,803,057.99        0.47
Asset Verification.................       18          4,535,392.12        1.18
Income Verification................        0                  0.00        0.00
Mortgage Verification..............       38         10,931,916.11        2.85
Preferred Processing...............       10          2,488,943.50        0.65
                                       -----       ---------------     -------
        Total......................    1,357       $383,181,430.99      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    Documentation levels  vary depending  upon several  factors, including  loan
amount,  Loan-to-Value  Ratio and  the type  and purpose  of the  Mortgage Loan.
Asset, income  and  mortgage  verifications were  obtained  for  Mortgage  Loans
processed  with  "full documentation."  In the  case of  "preferred processing,"
neither  asset,  income  nor  mortgage  verifications  were  obtained.  In  most
instances,  a verification of  the borrower's employment  was obtained. However,
for all of the Mortgage  Loans, a credit report on  the borrower and a  property
appraisal  were  obtained.  See "The  Mortgage  Loan Programs  --  Mortgage Loan
Underwriting" in the Prospectus.
 
                   ORIGINAL MORTGAGE LOAN PRINCIPAL BALANCES
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
ORIGINAL MORTGAGE LOAN PRINCIPAL     OF MORTGAGE      PRINCIPAL       PRINCIPAL
BALANCE                                 LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Less than or equal to $200,000.....      176       $ 19,735,114.90        5.15   %
$200,001-$250,000..................      383         88,719,443.63       23.15
$250,001-$300,000..................      358         98,804,382.44       25.79
$300,001-$350,000..................      189         60,922,418.34       15.90
$350,001-$400,000..................      122         45,921,454.90       11.98
$400,001-$450,000..................       37         15,804,841.93        4.12
$450,001-$500,000..................       40         19,342,539.86        5.05
$500,001-$550,000..................       17          9,027,439.45        2.36
$550,001-$600,000..................       12          6,962,021.00        1.82
$600,001-$650,000..................       15          9,550,940.63        2.49
$750,001-$800,000..................        2          1,570,782.09        0.41
$900,001-$950,000..................        2          1,877,230.68        0.49
$950,001-$1,000,000................        3          2,993,351.14        0.78
Over $ 1 Million...................        1          1,949,470.00        0.51
                                       -----       ---------------     -------
        Total......................    1,357       $383,181,430.99      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    As of the Cut-Off Date, the average unpaid principal balance of the Mortgage
Loans is expected  to be  approximately $282,374. As  of the  Cut-Off Date,  the
weighted   average   Loan-to-Value  Ratio   at   origination  and   the  maximum
Loan-to-Value Ratio  at origination  of the  Mortgage Loans  which had  original
principal balances in excess of $600,000 are expected to be approximately 64.75%
and  80.00%,  respectively. See  "The Trust  Estates --  Mortgage Loans"  in the
Prospectus.
 
                                      S-76
<PAGE>
                              MORTGAGED PROPERTIES
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
                                     OF MORTGAGE      PRINCIPAL       PRINCIPAL
PROPERTY                                LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Single-family detached.............    1,214       $350,336,223.40       91.42   %
Two- to four-family units..........        5          1,669,310.95        0.44
Condominiums
  High-rise(greater than four
   stories)........................       12          3,093,345.96        0.81
  Low-rise(four stories or less)...       47          8,844,268.59        2.31
Planned unit developments..........       64         17,998,554.61        4.70
Townhouses.........................        2            464,740.89        0.12
Cooperative Units..................       13            774,986.59        0.20
                                       -----       ---------------     -------
        Total......................    1,357       $383,181,430.99      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
                                      S-77
<PAGE>
                GEOGRAPHIC DISTRIBUTION OF MORTGAGED PROPERTIES
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
                                     OF MORTGAGE      PRINCIPAL       PRINCIPAL
GEOGRAPHIC AREA                         LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Alabama............................        4       $  1,197,390.72        0.31   %
Arizona............................       21          5,340,044.67        1.39
Arkansas...........................        7          1,957,970.65        0.51
California.........................      358        110,887,064.02       28.92
Colorado...........................       36         10,777,394.32        2.81
Connecticut........................       30          8,138,019.55        2.12
Delaware...........................        2            454,253.63        0.12
District of Columbia...............        8          2,059,097.90        0.54
Florida............................       87         25,312,027.65        6.61
Georgia............................       82         23,713,476.44        6.19
Hawaii.............................        6          1,713,027.93        0.45
Idaho..............................        6          1,664,297.49        0.43
Illinois...........................       25          7,812,423.45        2.04
Indiana............................        1            231,717.91        0.06
Iowa...............................        1            383,833.34        0.10
Kansas.............................        1            440,724.48        0.12
Kentucky...........................        4            858,721.56        0.22
Louisiana..........................        7          1,906,831.65        0.50
Maine..............................        1            256,370.47        0.07
Maryland...........................       43         13,299,621.77        3.47
Massachusetts......................       41         11,305,837.69        2.95
Michigan...........................       10          2,255,041.93        0.59
Minnesota..........................       28          8,284,259.77        2.16
Mississippi........................        5          1,401,209.86        0.37
Missouri...........................        5          1,486,457.94        0.39
Montana............................        4            921,725.49        0.24
Nebraska...........................        6          1,673,186.81        0.44
Nevada.............................       15          4,583,597.56        1.20
New Jersey.........................      109         27,096,445.15        7.07
New Mexico.........................        4          1,240,632.05        0.32
New York...........................      153         33,800,405.67        8.82
North Carolina.....................       22          6,113,471.86        1.60
North Dakota.......................        1            247,853.58        0.06
Ohio...............................        5          1,139,415.95        0.30
Oklahoma...........................        5          1,455,125.03        0.38
Oregon.............................       25          6,730,263.93        1.76
Pennsylvania.......................       29          7,956,408.37        2.08
Rhode Island.......................        6          1,152,046.90        0.30
South Carolina.....................        5          1,161,475.78        0.30
Tennessee..........................       13          3,628,518.14        0.95
Texas..............................       33         10,802,472.94        2.82
Utah...............................       15          4,134,953.41        1.08
Vermont............................        2            678,902.94        0.18
Virginia...........................       52         15,890,121.97        4.15
Washington.........................       33          9,317,465.47        2.43
Wyoming............................        1            319,825.20        0.08
                                     -----------   ---------------     -------
        Total......................    1,357       $383,181,430.99      100.00   %
                                     -----------   ---------------     -------
                                     -----------   ---------------     -------
</TABLE>
 
    No more than  approximately 0.69%  of the Cut-Off  Date Aggregate  Principal
Balance  of the Mortgage Loans is expected to be secured by Mortgaged Properties
located in any one five-digit zip code.
 
                                      S-78
<PAGE>
                         ORIGINATORS OF MORTGAGE LOANS
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
                                     OF MORTGAGE      PRINCIPAL       PRINCIPAL
ORIGINATOR                              LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
NMI, PHMC or Affiliate.............      635       $179,729,663.50       46.90   %
Other Originators..................      722        203,451,767.49       53.10
                                       -----       ---------------     -------
        Total......................    1,357       $383,181,430.99      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    It is expected  that, as  of the  Mortgage Loan  Cut-off Date  three of  the
"Other  Originators"  will have  accounted for  approximately 11.03%,  9.04% and
7.78%, respectively, of the Cut-Off  Date Aggregate Principal Balance. No  other
single  "Other Originator" is expected to have  accounted for more than 5.00% of
the Cut-Off Date Aggregate Principal Balance.
 
                           PURPOSES OF MORTGAGE LOANS
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
                                     OF MORTGAGE      PRINCIPAL       PRINCIPAL
LOAN PURPOSE                            LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Purchase...........................      969       $264,326,743.39       68.98   %
Equity Take Out Refinance..........      105         29,573,441.54        7.72
Rate/Term Refinance................      283         89,281,246.06       23.30
                                       -----       ---------------     -------
        Total......................    1,357       $383,181,430.99      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    In general, in the  case of a Mortgage  Loan made for "rate/term"  refinance
purposes,  substantially  all  of the  proceeds  are  used to  pay  in  full the
principal balance of a previous mortgage loan of the mortgagor with respect to a
Mortgaged Property and to pay origination and closing costs associated with such
refinancing. However, in the case of a Mortgage Loan made for "equity take  out"
refinance  purposes, all or a portion of  the proceeds are generally retained by
the mortgagor for uses unrelated to  the Mortgaged Property. The amount of  such
proceeds retained by the mortgagor may be substantial. See "The Trust Estates --
Mortgage  Loans" and "The Mortgage Loan  Programs -- Mortgage Loan Underwriting"
in the Prospectus.
 
MANDATORY REPURCHASE OR SUBSTITUTION OF MORTGAGE LOANS
 
    The Seller is required, with respect to Mortgage Loans that are found by the
Trustee to have defective documentation, or  in respect of which the Seller  has
breached  a representation or warranty, either to repurchase such Mortgage Loans
or, if within two  years of the  date of initial issuance  of the Series  1996-4
Certificates,  to substitute new  Mortgage Loans therefor.  Any Mortgage Loan so
substituted must, among other things, have an unpaid principal balance equal  to
or  less than the Scheduled Principal Balance  of the Mortgage Loan for which it
is being substituted (after giving effect to the scheduled principal payment due
in the month of substitution on the Mortgage Loan for which a new Mortgage  Loan
is  being  substituted), 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  being
substituted.  See "Prepayment and Yield  Considerations" herein and "The Pooling
and Servicing Agreement -- Assignment of  Mortgage Loans to the Trustee" in  the
Prospectus.
 
                                      S-79
<PAGE>
OPTIONAL REPURCHASE OF DEFAULTED MORTGAGE LOANS
 
    Subject  to certain  limitations, the  Seller may,  in its  sole discretion,
repurchase any defaulted Mortgage Loan, or any Mortgage Loan as to which default
is reasonably foreseeable, from the Trust Estate at a price equal to the  unpaid
principal  balance of  such Mortgage Loan,  together with accrued  interest at a
rate equal to the Mortgage  Interest Rate through the last  day of the month  in
which  such  repurchase  occurs. See  "The  Pooling and  Servicing  Agreement --
Optional Purchases" in the Prospectus. A  Servicer may, in its sole  discretion,
allow  the assumption  of a defaulted  Mortgage Loan serviced  by such Servicer,
subject to certain conditions specified  in the applicable Underlying  Servicing
Agreement,  or  encourage  the refinancing  of  a defaulted  Mortgage  Loan. See
"Prepayment and  Yield Considerations"  herein and  "Servicing of  the  Mortgage
Loans -- Enforcement of Due-on-Sale Clauses; Realization Upon Defaulted Mortgage
Loans" in the Prospectus.
 
                     DELINQUENCY AND FORECLOSURE EXPERIENCE
 
    The  following  tables  set  forth  certain  information  concerning  recent
delinquency, foreclosure  and  loan  loss experience  on  (i)  the  conventional
mortgage  loans included in Norwest Mortgage's mortgage loan servicing portfolio
which were originated by Norwest Mortgage for its own account or the account  of
an affiliate, which were acquired by Norwest Mortgage for its own account or for
the  account  of an  affiliate  or as  to  which Norwest  Mortgage  acquired the
servicing rights  (other  than from  PHMC)  (the "NMI  Portfolio  Loans"),  (ii)
conventional mortgage loans included in PHMC's mortgage loan servicing portfolio
prior  to  the PHMC  Acquisition (the  "PHMC Portfolio  Loans"), (iii)  the PHMC
Portfolio Loans  which  are fixed  interest  rate mortgage  loans  ("Fixed  PHMC
Portfolio  Loans"),  including,  in  both cases,  mortgage  loans  originated in
connection with the purchases of residences by relocated employees  ("Relocation
Mortgage  Loans")  and  (iv)  the  Fixed PHMC  Portfolio  Loans  other  than the
Relocation Mortgage Loans  ("Fixed Non-relocation PHMC  Portfolio Loans"). As  a
consequence  of the  PHMC Acquisition,  all of  the PHMC  Portfolio Loans became
serviced or subserviced by Norwest Mortgage on May 7, 1996. See "Description  of
the  Mortgage Loans"  herein and  "The Mortgage  Loan Programs  -- Mortgage Loan
Underwriting" in  the Prospectus.  The delinquency,  foreclosure and  loan  loss
experience  represents the recent experience of Norwest Mortgage and PHMC. There
can be no assurance that the  delinquency, foreclosure and loan loss  experience
set forth with respect to the PHMC Portfolio Loans or NMI Portfolio Loans, which
include  both fixed and adjustable interest rate mortgage loans and loans having
a variety of  original terms  to stated maturity  including Relocation  Mortgage
Loans  and non-relocation mortgage loans, and  the Fixed PHMC Portfolio Loans or
Fixed Non-relocation PHMC Portfolio Loans, each of which includes loans having a
variety of payment characteristics,  such as Subsidy  Loans, Buy-Down Loans  and
Balloon  Loans, will  be representative of  the results that  may be experienced
with respect to the Mortgage Loans included in the Trust Estate.
 
    Historically, Relocation  Mortgage  Loans, which  constitute  a  significant
percentage  of the PHMC Portfolio Loans,  have experienced a significantly lower
rate of delinquency and  foreclosure than other mortgage  loans included in  the
PHMC  Portfolio Loans and Fixed PHMC Portfolio  Loans. There can be no assurance
that the future experience on the Mortgage Loans contained in the Trust  Estate,
all  of which are  fixed interest rate  mortgage loans having  original terms to
stated maturity ranging from approximately 20 to approximately 30 years and none
of which are Relocation Mortgage  Loans, will be comparable  to that of the  NMI
Portfolio Loans, the PHMC Portfolio Loans, the Fixed PHMC Portfolio Loans or the
Fixed Non-relocation PHMC Portfolio Loans.
 
    The  following tables reflect rapid growth  during recent periods in Norwest
Mortgage's mortgage loan servicing  portfolio as a  result of the  substantially
higher  volume of new loan originations  and acquisitions of recently originated
mortgage loans.  Delinquencies,  foreclosures  and  loan  losses  generally  are
expected  to occur  more frequently  after the  first full  year of  the life of
mortgage loans. Accordingly, because a  large number of mortgage loans  serviced
by  Norwest  Mortgage  have  been  recently  originated,  the  current  level of
delinquencies, foreclosures and loan losses may not be
 
                                      S-80
<PAGE>
representative of the  levels which may  be experienced over  the lives of  such
mortgage  loans. If the  volume of Norwest Mortgage's  new loan originations and
acquisitions does not continue to grow at the rate experienced in recent  years,
the  levels of delinquencies, foreclosures and loan losses as percentages of the
portfolio of  NMI  Portfolio Loans  could  rise significantly  above  the  rates
indicated in the following tables. In addition, because PHMC ceased the mortgage
loan  origination and acquisition  business subsequent to  the PHMC Acquisition,
the levels of delinquencies, foreclosures and loan losses as percentages of  the
portfolios  of  PHMC  Portfolio  Loans, Fixed  PHMC  Portfolio  Loans  and Fixed
Non-relocation PHMC Portfolio  Loans could  rise significantly  above the  rates
indicated in the following tables.
 
                                      S-81
<PAGE>
                           TOTAL NMI PORTFOLIO LOANS
<TABLE>
<CAPTION>
                                                          BY NO.       BY NO.       BY NO.
                                                         OF LOANS     OF LOANS     OF LOANS
                                                        -----------  -----------  -----------
                                                           AS OF        AS OF
                                                         DECEMBER     DECEMBER       AS OF
                                                            31,          31,       MARCH 31,
                                                           1994         1995         1996
                                                        -----------  -----------  -----------
<S>                                                     <C>          <C>          <C>
Total NMI Portfolio Loans.............................     391,838      555,855      594,028
                                                        -----------  -----------  -----------
                                                        -----------  -----------  -----------
 
Period of Delinquency (1)
  30 to 59 days.......................................       5,271        8,397        7,076
  60 to 89 days.......................................         924        1,653        1,459
  90 days or more.....................................         778        1,476        1,303
                                                        -----------  -----------  -----------
Total Delinquent Loans................................       6,973       11,526        9,838
                                                        -----------  -----------  -----------
                                                        -----------  -----------  -----------
 
Percent of NMI Portfolio Loans........................        1.78%        2.07%        1.66%
 
<CAPTION>
 
                                                           AS OF        AS OF        AS OF
                                                         DECEMBER     DECEMBER     MARCH 31,
                                                         31, 1994     31, 1995       1996
                                                        -----------  -----------  -----------
<S>                                                     <C>          <C>          <C>
Foreclosures (2)......................................       1,717        2,312        2,656
Foreclosure Ratio (3).................................        0.44%        0.42%        0.45%
<CAPTION>
 
                                                                                     THREE
                                                                                    MONTHS
                                                        YEAR ENDED   YEAR ENDED      ENDED
                                                         DECEMBER     DECEMBER     MARCH 31,
                                                         31, 1994     31, 1995       1996
                                                        -----------  -----------  -----------
                                                            (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                                     <C>          <C>          <C>
Net Gain (Loss) (4)...................................   $  (2,693)   $  (4,699)   $    (975)
Net Gain (Loss) Ratio (5).............................      (0.008)%     (0.009)%     (0.002)%
</TABLE>
 
- ------------------------
(1) The  indicated periods of delinquency  are based on the  number of days past
    due, based on a 30-day month. No mortgage loan is considered delinquent  for
    these  purposes until one month has passed since its contractual due date. A
    mortgage  loan  is   no  longer  considered   delinquent  once   foreclosure
    proceedings have commenced.
 
(2) Includes loans in the applicable portfolio for which foreclosure proceedings
    had  been instituted or with respect to  which the related property had been
    acquired as of the dates indicated.
 
(3) Foreclosures as a percentage of total  loans in the applicable portfolio  at
    the end of each period.
 
(4) Does  not  include gain  or loss  with  respect to  loans in  the applicable
    portfolio for  which foreclosure  proceedings had  been instituted  but  not
    completed  as of  the dates indicated,  or for which  the related properties
    have been acquired in foreclosure proceedings but not yet sold.
 
(5) Net gain (loss) as a percentage  of total loans in the applicable  portfolio
    at the end of each period.
 
                                      S-82
<PAGE>
                           TOTAL PHMC PORTFOLIO LOANS
 
<TABLE>
<CAPTION>
                                BY DOLLAR               BY DOLLAR               BY DOLLAR
                     BY NO.      AMOUNT      BY NO.      AMOUNT      BY NO.      AMOUNT
                    OF LOANS    OF LOANS    OF LOANS    OF LOANS    OF LOANS    OF LOANS
                    ---------  -----------  ---------  -----------  ---------  -----------
                            AS OF                   AS OF                   AS OF
                      DECEMBER 31, 1994       DECEMBER 31, 1995         MARCH 31, 1996
                    ----------------------  ----------------------  ----------------------
                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                 <C>        <C>          <C>        <C>          <C>        <C>
Total PHMC
 Portfolio
 Loans............    379,075  $62,175,544    423,895  $65,496,977    428,254  $65,575,478
                    ---------  -----------  ---------  -----------  ---------  -----------
                    ---------  -----------  ---------  -----------  ---------  -----------
 
Period of
 Delinquency (1)
  30 to 59 days...      3,548  $   548,524      5,103  $   710,246      4,013  $   566,761
  60 to 89 days...        797      128,053        959      141,847        825      123,728
  90 days or
   more...........      1,418      308,124        729      122,554        604      103,732
                    ---------  -----------  ---------  -----------  ---------  -----------
Total Delinquent
 Loans............      5,763  $   984,701      6,791  $   974,647      5,442  $   794,221
                    ---------  -----------  ---------  -----------  ---------  -----------
                    ---------  -----------  ---------  -----------  ---------  -----------
 
Percent of PHMC
 Portfolio
 Loans............       1.52%       1.58%       1.60%       1.49%       1.27%       1.21%
</TABLE>
<TABLE>
<CAPTION>
                                                AS OF               AS OF               AS OF
                                          DECEMBER 31, 1994   DECEMBER 31, 1995    MARCH 31, 1996
                                          -----------------   -----------------   -----------------
<S>                                       <C>                 <C>                 <C>
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
Foreclosures (2)........................  $  354,028          $  360,645          $  365,839
Foreclosure Ratio (3)...................       0.57%               0.55%               0.56%
 
<CAPTION>
                                                                                    THREE MONTHS
                                             YEAR ENDED          YEAR ENDED             ENDED
                                          DECEMBER 31, 1994   DECEMBER 31, 1995    MARCH 31, 1996
                                          -----------------   -----------------   -----------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                       <C>                 <C>                 <C>
Net Gain (Loss) (4).....................  $ (194,481)         $ (228,953)         $  (48,376)
Net Gain (Loss) Ratio (5)...............       (0.31)%             (0.35)%             (0.07)%
</TABLE>
 
- ------------------------
(1) The  indicated periods of delinquency  are based on the  number of days past
    due, based on a 30-day month. No mortgage loan is considered delinquent  for
    these  purposes until one month has passed since its contractual due date. A
    mortgage  loan  is   no  longer  considered   delinquent  once   foreclosure
    proceedings have commenced.
 
(2) Includes loans in the applicable portfolio for which foreclosure proceedings
    had  been instituted or with respect to  which the related property had been
    acquired as of the dates indicated.
 
(3) Foreclosures as a percentage of total  loans in the applicable portfolio  at
    the end of each period.
 
(4) Does  not  include gain  or loss  with  respect to  loans in  the applicable
    portfolio for  which foreclosure  proceedings had  been instituted  but  not
    completed  as of  the dates indicated,  or for which  the related properties
    have been acquired in foreclosure proceedings but not yet sold.
 
(5) Net gain (loss) as a percentage  of total loans in the applicable  portfolio
    at the end of each period.
 
                                      S-83
<PAGE>
                           FIXED PHMC PORTFOLIO LOANS
 
<TABLE>
<CAPTION>
                                BY DOLLAR               BY DOLLAR               BY DOLLAR
                     BY NO.      AMOUNT      BY NO.      AMOUNT      BY NO.      AMOUNT
                    OF LOANS    OF LOANS    OF LOANS    OF LOANS    OF LOANS    OF LOANS
                    ---------  -----------  ---------  -----------  ---------  -----------
                            AS OF                   AS OF                   AS OF
                      DECEMBER 31, 1994       DECEMBER 31, 1995         MARCH 31, 1996
                    ----------------------  ----------------------  ----------------------
                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                 <C>        <C>          <C>        <C>          <C>        <C>
Total Fixed PHMC
 Portfolio
 Loans............    307,975  $48,602,956    358,021  $53,576,591    365,459  $54,375,836
                    ---------  -----------  ---------  -----------  ---------  -----------
                    ---------  -----------  ---------  -----------  ---------  -----------
 
Period of
 Delinquency (1)
  30 to 59 days...      2,708  $   389,236      4,101  $   528,824      3,259  $   430,156
  60 to 89 days...        591       87,687        743       98,269        647       87,053
  90 days or
   more...........        965      188,414        545       82,595        446       70,081
                    ---------  -----------  ---------  -----------  ---------  -----------
Total Delinquent
 Loans............      4,264  $   665,337      5,389  $   709,688      4,352  $   587,290
                    ---------  -----------  ---------  -----------  ---------  -----------
                    ---------  -----------  ---------  -----------  ---------  -----------
 
Percent of Fixed
 PHMC Portfolio
 Loans............       1.38%       1.37%       1.51%       1.32%       1.19%       1.08%
</TABLE>
<TABLE>
<CAPTION>
                                                AS OF               AS OF               AS OF
                                          DECEMBER 31, 1994   DECEMBER 31, 1995    MARCH 31, 1996
                                          -----------------   -----------------   -----------------
<S>                                       <C>                 <C>                 <C>
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
Foreclosures (2)........................  $  208,253          $  218,951          $  222,949
Foreclosure Ratio (3)...................       0.43%               0.41%               0.41%
 
<CAPTION>
                                                                                    THREE MONTHS
                                             YEAR ENDED          YEAR ENDED             ENDED
                                          DECEMBER 31, 1994   DECEMBER 31, 1995    MARCH 31, 1996
                                          -----------------   -----------------   -----------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                       <C>                 <C>                 <C>
Net Gain (Loss) (4).....................  $ (133,071)         $ (164,753)         $  (34,015)
Net Gain (Loss) Ratio (5)...............       (0.27)%             (0.31)%             (0.06)%
</TABLE>
 
- ------------------------
(1) The  indicated periods of delinquency  are based on the  number of days past
    due, based on a 30-day month. No mortgage loan is considered delinquent  for
    these  purposes until one month has passed since its contractual due date. A
    mortgage  loan  is   no  longer  considered   delinquent  once   foreclosure
    proceedings have commenced.
 
(2) Includes loans in the applicable portfolio for which foreclosure proceedings
    had  been instituted or with respect to  which the related property had been
    acquired as of the dates indicated.
 
(3) Foreclosures as a percentage of total  loans in the applicable portfolio  at
    the end of each period.
 
(4) Does  not  include gain  or loss  with  respect to  loans in  the applicable
    portfolio for  which foreclosure  proceedings had  been instituted  but  not
    completed  as of  the dates indicated,  or for which  the related properties
    have been acquired in foreclosure proceedings but not yet sold.
 
(5) Net gain (loss) as a percentage  of total loans in the applicable  portfolio
    at the end of each period.
 
                                      S-84
<PAGE>
                   FIXED NON-RELOCATION PHMC PORTFOLIO LOANS
 
<TABLE>
<CAPTION>
                                BY DOLLAR               BY DOLLAR               BY DOLLAR
                     BY NO.     AMOUNT OF    BY NO.     AMOUNT OF    BY NO.     AMOUNT OF
                    OF LOANS      LOANS     OF LOANS      LOANS     OF LOANS      LOANS
                    ---------  -----------  ---------  -----------  ---------  -----------
                            AS OF                   AS OF                   AS OF
                      DECEMBER 31, 1994       DECEMBER 31, 1995         MARCH 31, 1996
                    ----------------------  ----------------------  ----------------------
                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                 <C>        <C>          <C>        <C>          <C>        <C>
Total Fixed Non-
 relocation PHMC
 Portfolio
 Loans............    262,159  $41,589,441    303,943  $45,251,942    310,267  $45,839,965
                    ---------  -----------  ---------  -----------  ---------  -----------
                    ---------  -----------  ---------  -----------  ---------  -----------
 
Period of
 Delinquency (1)
  30 to 59 days...      2,424  $   350,629      3,658  $   470,877      2,956  $   391,228
  60 to 89 days...        539       80,843        679       89,665        606       81,541
  90 days or
   more...........        903      179,493        498       76,452        414       65,790
                    ---------  -----------  ---------  -----------  ---------  -----------
Total Delinquent
 Loans............      3,866  $   610,965      4,835  $   636,994      3,976  $   538,559
                    ---------  -----------  ---------  -----------  ---------  -----------
                    ---------  -----------  ---------  -----------  ---------  -----------
 
Percent of Fixed
 Non-relocation
 PHMC Portfolio
 Loans............       1.47%        1.47%      1.59%        1.41%      1.28%        1.17%
</TABLE>
<TABLE>
<CAPTION>
                                                AS OF               AS OF               AS OF
                                          DECEMBER 31, 1994   DECEMBER 31, 1995    MARCH 31, 1996
                                          -----------------   -----------------   -----------------
<S>                                       <C>                 <C>                 <C>
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
Foreclosures (2)........................  $  199,379          $  208,865          $  214,724
Foreclosure Ratio (3)...................       0.48%               0.46%               0.47%
 
<CAPTION>
 
                                                                                    THREE MONTHS
                                             YEAR ENDED          YEAR ENDED             ENDED
                                          DECEMBER 31, 1994   DECEMBER 31, 1995    MARCH 31, 1996
                                          -----------------   -----------------   -----------------
                                                        (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                       <C>                 <C>                 <C>
Net Gain (Loss) (4).....................  $ (131,339)         $ (161,830)         $  (32,140)
Net Gain (Loss) Ratio (5)...............       (0.32)%             (0.36)%             (0.07)%
</TABLE>
 
- ------------------------
(1) The  indicated periods of delinquency  are based on the  number of days past
    due, based on a 30-day month. No mortgage loan is considered delinquent  for
    these  purposes until one month has passed since its contractual due date. A
    mortgage  loan  is   no  longer  considered   delinquent  once   foreclosure
    proceedings have commenced.
 
(2) Includes loans in the applicable portfolio for which foreclosure proceedings
    had  been instituted or with respect to  which the related property had been
    acquired as of the dates indicated.
 
(3) Foreclosures as a percentage of total  loans in the applicable portfolio  at
    the end of each period.
 
(4) Does  not  include gain  or loss  with  respect to  loans in  the applicable
    portfolio for  which foreclosure  proceedings had  been instituted  but  not
    completed  as of  the dates indicated,  or for which  the related properties
    have been acquired in foreclosure proceedings but not yet sold.
 
(5) Net gain (loss) as a percentage  of total loans in the applicable  portfolio
    at the end of each period.
 
                                      S-85
<PAGE>
    The likelihood that a mortgagor will become delinquent in the payment of his
or  her mortgage loan, the rate of any subsequent foreclosures, and the severity
of any loan loss experience, may be affected by a number of factors related to a
borrower's personal circumstances, including,  but not limited to,  unemployment
or  change  in  employment  (or  in  the  case  of  self-employed  mortgagors or
mortgagors relying  on  commission  income,  fluctuations  in  income),  marital
separation  and the  mortgagor's equity  in the  related mortgaged  property. In
addition, delinquency, foreclosure and loan loss experience may be sensitive  to
adverse  economic  conditions,  either  nationally  or  regionally,  may exhibit
seasonal variations and  may be influenced  by the level  of interest rates  and
servicing   decisions  on  the  applicable  mortgage  loans.  Regional  economic
conditions (including  declining real  estate  values) may  particularly  affect
delinquency,  foreclosure  and loan  loss experience  on  mortgage loans  to the
extent that mortgaged properties are  concentrated in certain geographic  areas.
Furthermore,  the level  of foreclosures reported  is affected by  the length of
time legally required to complete the foreclosure process and take title to  the
related property, which varies from jurisdiction to jurisdiction. The changes in
the  delinquency, foreclosure and loan loss experience of Norwest Mortgage's and
PHMC's servicing portfolio during the periods  set forth in the preceding  table
may be attributable to factors such as those described above, although there can
be  no assurance as  to whether these  changes are the  result of any particular
factor or a combination of factors.  The delinquency, foreclosure and loan  loss
experience   on  the  Mortgage  Loans  serviced   by  Norwest  Mortgage  may  be
particularly affected to the  extent that the  related Mortgaged Properties  are
concentrated  in areas which experience adverse economic conditions or declining
real estate values. See  "Description of the Mortgage  Loans" in the  Prospectus
Supplement.
 
                      PREPAYMENT AND YIELD CONSIDERATIONS
 
    The  rate  of distributions  in reduction  of the  principal balance  of any
Subclass  or  Class  of  the  Offered  Certificates,  the  aggregate  amount  of
distributions on any Subclass or Class of the Offered Certificates and the yield
to  maturity of any Subclass or Class of the Offered Certificates purchased at a
discount or  premium  will  be directly  related  to  the rate  of  payments  of
principal on the Mortgage Loans in the Trust Estate and the amount and timing of
mortgagor  defaults resulting in Realized Losses. The rate of principal payments
on the Mortgage Loans will in turn be affected by the amortization schedules  of
the  Mortgage  Loans,  the  rate  of  principal  prepayments  (including partial
prepayments  and  those  resulting  from  refinancing)  thereon  by  mortgagors,
liquidations  of defaulted Mortgage Loans, repurchases by the Seller of Mortgage
Loans as a result of defective documentation or breaches of representations  and
warranties  and optional purchases by the Seller of all of the Mortgage Loans in
connection with the  termination of the  Trust Estate. See  "Description of  the
Mortgage  Loans -- Mandatory  Repurchase or Substitution  of Mortgage Loans" and
"Pooling and  Servicing  Agreement  -- Optional  Termination"  herein  and  "The
Pooling and Servicing Agreement -- Assignment of Mortgage Loans to the Trustee,"
"--  Optional Purchases" and "-- Termination; Purchase of Mortgage Loans" in the
Prospectus. Mortgagors are permitted to prepay  the Mortgage Loans, in whole  or
in  part, at any  time without penalty.  As described under  "Description of the
Certificates  --   Principal  (Including   Prepayments)"   herein,  all   or   a
disproportionate  percentage  of  principal prepayments  on  the  Mortgage Loans
(including liquidations and repurchases of Mortgage Loans) will be  distributed,
to the extent of the Non-PO Fraction, to the holders of the Class A Certificates
(other  than  the Class  A-12 Certificates  with  respect to  the Class  A-12 PO
Component) then entitled  to distributions  in respect of  principal during  the
nine  years beginning on  the first Distribution  Date, and, to  the extent that
such principal prepayments are made in  respect of a Discount Mortgage Loan,  to
the  Class A-12 Certificates in proportion to  the interest of the Class A-12 PO
Component in such Discount  Mortgage Loan represented by  the PO Fraction. As  a
result  of  the method  of calculating  the  Class A-5  Priority Amount  and the
priorities for the  allocation of  the Class A  Non-PO Principal  Amount, it  is
expected that, absent an exceptionally high rate of principal prepayments on the
Mortgage  Loans, no  principal prepayments  will be  allocated to  the Class A-5
Certificates during the first  five years following the  issuance of the  Series
1996-4  Certificates  and that,  while the  percentage of  principal prepayments
allocated   to   the   Class   A-5   Certificates   during   the   four    years
 
                                      S-86
<PAGE>
thereafter  will  gradually  increase,  such percentage,  until  the  tenth year
following  the   issuance   of  the   Series   1996-4  Certificates,   will   be
disproportionately  lower  than  the percentage  of  such  principal prepayments
allocated to  the  other  Class  A  Certificates  (other  than  the  Class  A-12
Certificates  with respect to the Class  A-12 PO Component). See "Description of
the Certificates -- Principal (Including Prepayments) -- Allocation of Amount to
be Distributed." Prepayments  (which, as  used herein,  include all  unscheduled
payments  of  principal,  including  payments  as  the  result  of liquidations,
purchases and repurchases) of the Mortgage Loans in the Trust Estate will result
in distributions to Certificateholders then entitled to distributions in respect
of principal of amounts which would otherwise be distributed over the  remaining
terms of such Mortgage Loans. Since the rate of prepayment on the Mortgage Loans
will  depend on future events and a  variety of factors (as described more fully
below and in  the Prospectus  under "Prepayment and  Yield Considerations"),  no
assurance  can be given as to such rate or the rate of principal payments on any
Subclass or  Class  of the  Offered  Certificates  or the  aggregate  amount  of
distributions on any Subclass or Class of the Offered Certificates.
 
    The  rate of payments (including prepayments)  on pools of mortgage loans is
influenced by a variety  of economic, geographic, social  and other factors.  If
prevailing  rates for  similar mortgage loans  fall below  the Mortgage Interest
Rates on the Mortgage Loans, the rate of prepayment would generally be  expected
to  increase. Conversely, if interest rates on similar mortgage loans rise above
the Mortgage Interest Rates on the Mortgage Loans, the rate of prepayment  would
generally  be expected to decrease. The rate of prepayment on the Mortgage Loans
may also  be  influenced  by  programs  offered  by  mortgage  loan  originators
(including   Norwest  Mortgage),  servicers  (including  Norwest  Mortgage)  and
mortgage  loan  brokers  to  encourage  refinancing  through  such  originators,
servicers  and  brokers,  including, but  not  limited to,  general  or targeted
solicitations (which may be based on characteristics including, but not  limited
to,  the  mortgage loan  interest  rate or  payment  history and  the geographic
location of the Mortgaged Property), reduced origination fees or closing  costs,
pre-approved  applications, waiver of pre-closing  interest accrued with respect
to a refinanced  loan prior  to the  pay-off of  such loan,  or other  financial
incentives. See "Prepayment and Yield Considerations -- Weighted Average Life of
Certificates"  in the Prospectus. In addition, Norwest Mortgage or third parties
may enter into agreements with borrowers providing for the bi-weekly payment  of
principal  and  interest  on  the related  mortgage  loan,  thereby accelerating
payment of the mortgage loan resulting in partial prepayments.
 
    Other factors  affecting prepayment  of mortgage  loans include  changes  in
mortgagors'  housing  needs,  job transfers,  unemployment  or, in  the  case of
self-employed mortgagors or mortgagors relying on commission income, substantial
fluctuations in income, significant declines  in real estate values and  adverse
economic   conditions  either  generally  or  in  particular  geographic  areas,
mortgagors' equity in the Mortgaged Properties,  including the use of second  or
"home  equity" mortgage  loans by  mortgagors or  the use  of the  properties as
second or  vacation homes,  and servicing  decisions. In  addition, all  of  the
Mortgage  Loans contain  due-on-sale clauses  which will  generally be exercised
upon the sale of the related Mortgaged Properties. Consequently, acceleration of
mortgage payments  as  a result  of  any such  sale  will affect  the  level  of
prepayments  on the Mortgage Loans. The extent to which defaulted Mortgage Loans
are assumed by transferees of the related Mortgaged Properties will also  affect
the rate of principal payments. The rate of prepayment and, therefore, the yield
to  maturity of the Offered Certificates will be affected by the extent to which
(i) the Seller elects to repurchase, rather than substitute for, Mortgage  Loans
which  are found by the Trustee to  have defective documentation or with respect
to which the Seller has breached a representation or warranty or (ii) a Servicer
elects to encourage the refinancing of  any defaulted Mortgage Loan rather  than
to  permit an assumption thereof by a  mortgagor. See "Servicing of the Mortgage
Loans -- Enforcement of Due-on-Sale Clauses; Realization Upon Defaulted Mortgage
Loans" in  the  Prospectus.  There  can  be no  certainty  as  to  the  rate  of
prepayments  on the  Mortgage Loans during  any period  or over the  life of the
Series 1996-4 Certificates.  See "Prepayment  and Yield  Considerations" in  the
Prospectus.
 
                                      S-87
<PAGE>
    THE  YIELD  TO MATURITY  OF THE  OFFERED CERTIFICATES  WILL BE  SENSITIVE IN
VARYING DEGREES  TO  THE  RATE  AND  TIMING  OF  PRINCIPAL  PAYMENTS  (INCLUDING
PREPAYMENTS,  WHICH MAY  BE MADE  AT ANY TIME  WITHOUT PENALTY)  ON THE MORTGAGE
LOANS. INVESTORS  IN THE  OFFERED CERTIFICATES  SHOULD CONSIDER  THE  ASSOCIATED
RISKS,  INCLUDING, IN THE CASE OF  OFFERED CERTIFICATES PURCHASED AT A DISCOUNT,
THE RISK THAT A SLOWER THAN ANTICIPATED RATE OF PAYMENTS IN RESPECT OF PRINCIPAL
(INCLUDING PREPAYMENTS) ON THE  MORTGAGE LOANS COULD RESULT  IN AN ACTUAL  YIELD
THAT  IS LOWER THAN ANTICIPATED.  A FASTER THAN ANTICIPATED  RATE OF PAYMENTS IN
RESPECT OF PRINCIPAL (INCLUDING PREPAYMENTS) ON THE MORTGAGE LOANS COULD  RESULT
IN  AN  ACTUAL YIELD  THAT IS  LOWER THAN  ANTICIPATED FOR  INVESTORS PURCHASING
OFFERED CERTIFICATES AT A PREMIUM. INVESTORS PURCHASING OFFERED CERTIFICATES  AT
A PREMIUM SHOULD ALSO CONSIDER THE RISK THAT A RAPID RATE OF PAYMENTS IN RESPECT
OF  PRINCIPAL (INCLUDING PREPAYMENTS) ON THE  MORTGAGE LOANS COULD RESULT IN THE
FAILURE OF SUCH INVESTORS TO FULLY RECOVER THEIR INITIAL INVESTMENTS.
 
    The timing of changes in  the rate of prepayment  on the Mortgage Loans  may
significantly affect the actual yield to maturity experienced by an investor who
purchases  an Offered Certificate at a price other than par, even if the average
rate of  principal  payments  experienced  over time  is  consistent  with  such
investor's expectation. In general, the earlier a prepayment of principal on the
underlying  Mortgage Loans, the  greater the effect on  such investor's yield to
maturity. As a result, the effect on such investor's yield of principal payments
occurring at a rate higher (or lower) than the rate anticipated by the  investor
during the period immediately following the issuance of the Offered Certificates
would  not be fully offset  by a subsequent like  reduction (or increase) in the
rate of principal payments.
 
    The yield to  maturity on the  Class M Certificates  will be more  sensitive
than the yield to maturity on the Class A Certificates to losses due to defaults
on the Mortgage Loans (and the timing thereof), to the extent not covered by the
Class B Certificates, because the entire amount of such losses will be allocable
to  the  Class M  Certificates  prior to  the  Class A  Certificates,  except as
otherwise provided  herein. To  the  extent not  covered by  Periodic  Advances,
delinquencies on Mortgage Loans may also have a relatively greater effect on the
yield  to investors in the Class M Certificates. Amounts otherwise distributable
to holders of the  Class M Certificates  will be made  available to protect  the
holders  of the Class A Certificates  against interruptions in distributions due
to certain  mortgagor  delinquencies.  Such delinquencies,  to  the  extent  not
covered  by the Class B Certificates, even if subsequently cured, may affect the
timing of the receipt of distributions  by the holders of Class M  Certificates,
because  the entire amount of those delinquencies  would be borne by the Class M
Certificates prior to the Class A Certificates.
 
    The yield to maturity on the Subclasses of Class B Certificates with  higher
numerical  designations  will generally  be more  sensitive  to losses  than the
Subclasses with lower numerical designations, and  the yield to maturity on  the
Class B Certificates in the aggregate will generally be more sensitive to losses
than  the other  Classes of the  Series 1996-4 Certificates,  because the entire
amount of such losses (except for  the portion of Excess Special Hazard  Losses,
Excess  Fraud  Losses and  Excess  Bankruptcy Losses  allocated  to the  Class A
Certificates, Class M Certificates and  Subclasses of Class B Certificates  with
lower  numerical designations)  will be allocable  to the Subclasses  of Class B
Certificates in  reverse numerical  order,  except as  provided herein.  To  the
extent  not covered by  Periodic Advances, delinquencies  on Mortgage Loans will
also have  a relatively  greater effect  (i) on  the yield  to maturity  on  the
Subclasses  of Class B Certificates with  higher numerical designations and (ii)
on the yield to maturity  on the Class B Certificates  in the aggregate than  on
the   Class  A  Certificates   and  Class  M   Certificates.  Amounts  otherwise
distributable to holders of the Class  B Certificates will be made available  to
protect   the  holders  of  the  Class   A  and  Class  M  Certificates  against
interruptions in  distributions due  to  certain mortgagor  delinquencies.  Such
delinquencies,  even if subsequently cured, may affect the timing of the receipt
of distributions by the holders of the Class B Certificates.
 
    The actual yield to maturity experienced by an investor may also be affected
by the occurrence  of interest shortfalls  resulting from Unscheduled  Principal
Receipts  to  the extent,  if any,  to  which such  interest shortfalls  are not
covered by Compensating  Interest or the  subordination of, (i)  in the case  of
 
                                      S-88
<PAGE>
the Class A Certificates (other than the Class A-12 Certificates with respect to
the  A-12 PO Component), the Class M and  Class B Certificates, (ii) in the case
of the Class M Certificates, the Class B Certificates and (iii) in the case of a
Subclass of  Class  B  Certificates,  the Subclass  or  Subclasses  of  Class  B
Certificates  with  higher  numerical  designations.  See  "Description  of  the
Certificates -- Interest" and  "Servicing of the  Mortgage Loans --  Anticipated
Changes in Servicing."
 
    The  yield to maturity on the  Offered Certificates and more particularly on
the Class M Certificates  and the Offered Class  B Certificates, especially  the
Class  B-2 Certificates, may be affected  by the geographic concentration of the
Mortgaged Properties securing the Mortgage Loans. In recent periods,  California
and  several other  regions in  the United  States have  experienced significant
declines in housing prices.  In addition, California  and several other  regions
have   experienced   natural  disasters,   including  earthquakes,   floods  and
hurricanes, which may  adversely affect  property values.  Any deterioration  in
housing  prices in  California, as  well as  New York,  New Jersey,  Florida and
Georgia and the other states in which the Mortgaged Properties are located,  and
any  deterioration of economic conditions in such states which adversely affects
the ability of borrowers  to make payments on  the Mortgage Loans, may  increase
the  likelihood of losses on the Mortgage Loans. Such losses, if they occur, may
have an adverse effect on the yield to maturity of the Offered Certificates  and
more  particularly  on  the  Class  M  Certificates  and  the  Offered  Class  B
Certificates, especially the Class B-2 Certificates.
 
    No representation  is made  as to  the  rate of  principal payments  on  the
Mortgage  Loans or  as to  the yield  to maturity  of any  Subclass or  Class of
Offered Certificates. An investor is urged  to make an investment decision  with
respect  to  any  Subclass  or  Class  of  Offered  Certificates  based  on  the
anticipated yield to maturity of such Subclass or Class of Offered  Certificates
resulting  from its purchase  price and such investor's  own determination as to
anticipated Mortgage Loan  prepayment rates  under a variety  of scenarios.  The
extent  to which any Subclass or Class of Offered Certificates is purchased at a
discount or  a  premium and  the  degree to  which  such Subclass  or  Class  is
sensitive  to the timing of  prepayments will determine the  extent to which the
yield to maturity of such Subclass or Class may vary from the anticipated yield.
An investor should carefully  consider the associated  risks, including, in  the
case  of any Subclass or Class of  Offered Certificates purchased at a discount,
the risk  that a  slower than  anticipated  rate of  principal payments  on  the
Mortgage  Loans could result in  an actual yield to  such investor that is lower
than the anticipated yield and, in the case of any Subclass or Class of  Offered
Certificates purchased at a premium the risk that a faster than anticipated rate
of  principal payments could result in an  actual yield to such investor that is
lower than the anticipated yield.
 
    An investor should consider the risk that rapid rates of prepayments on  the
Mortgage Loans, and therefore of amounts distributable in reduction of principal
balance of the Offered Certificates, may coincide with periods of low prevailing
interest  rates. During such periods, the effective interest rates on securities
in which an investor may choose to reinvest amounts distributed in reduction  of
the  principal balance of such investor's  Offered Certificate may be lower than
the applicable Pass-Through Rate. Conversely, slower rates of prepayments on the
Mortgage Loans, and therefore of amounts distributable in reduction of principal
balance  of  the  Offered  Certificates,  may  coincide  with  periods  of  high
prevailing  interest  rates.  During  such  periods,  the  amount  of  principal
distributions available to an investor for reinvestment at such high  prevailing
interest rates may be relatively small.
 
    As indicated under "Federal Income Tax Considerations" herein, the Class A-R
and  Class A-LR Certificateholders'  REMIC taxable income  and the tax liability
thereon may exceed,  and may  substantially exceed, cash  distributions to  such
holders  during certain periods. There  can be no assurance  as to the amount by
which such taxable income or such  tax liability will exceed cash  distributions
in  respect of the Class A-R and  Class A-LR Certificates during any such period
and  no  representation  is  made  with  respect  thereto  under  any  principal
prepayment  scenario or otherwise. DUE TO  THE SPECIAL TAX TREATMENT OF RESIDUAL
INTERESTS, THE AFTER-TAX RETURN OF THE CLASS A-R AND CLASS A-LR CERTIFICATES MAY
BE SIGNIFICANTLY LOWER THAN WOULD  BE THE CASE IF THE  CLASS A-R AND CLASS  A-LR
CERTIFICATE WERE TAXED AS DEBT INSTRUMENTS, OR MAY BE NEGATIVE.
 
                                      S-89
<PAGE>
    As  referred to herein, the weighted average  life of a Subclass or Class of
the Offered Certificates refers to the  average amount of time that will  elapse
from  the  date of  issuance  of such  Subclass or  Class  until each  dollar in
reduction of the principal balance of  such Subclass or Class is distributed  to
the investor. The weighted average life of each Subclass or Class of the Offered
Certificates  will be influenced by, among other  things, the rate and timing of
principal payments on the Mortgage Loans, which may be in the form of  scheduled
amortization, prepayments or other recoveries of principal.
 
    THE  WEIGHTED AVERAGE  LIVES OF  THE COMPANION  CERTIFICATES WILL  BE HIGHLY
SENSITIVE TO  THE RATE  OF  PRINCIPAL PAYMENTS  (INCLUDING PREPAYMENTS)  ON  THE
MORTGAGE  LOANS. Specifically, if prepayments result in the portion of the Class
A Non-PO Principal Amount  available to make distributions  of principal to  the
TAC  Certificates and the Class A-12 Certificates with respect to the Class A-12
TAC Accrual Component  in accordance  with the proportions  and priorities,  set
forth   under  "Description   of  the   Certificates  --   Principal  (including
Prepayments) -- Allocation  of Amount to  Be Distributed" are  equal to or  less
than  the  TAC  Principal  Amounts  on  any  Distribution  Date,  the  Companion
Certificates will receive  no distributions  in reduction of  principal on  such
Distribution  Date from  the Class A  Non-PO Principal Amount.  Further, on each
Distribution Date up to and including the Distribution Date on which the Class A
Subclass Principal Balance of the Companion Certificates is reduced to zero, any
Excess Principal Payments  for such  Distribution Date  will be  applied to  the
Companion  Certificates before being distributed to the TAC Certificates and the
Class A-12 Certificates with respect to the Class A-12 TAC Accrual Component  in
the  proportions  and  priorities  set forth  above  under  "Description  of the
Certificates  --  Principal   (Including  Prepayments)   --  Principal   Payment
Characteristics of the TAC Certificates and the Companion Certificates."
 
    Prepayments on mortgage loans are commonly measured relative to a prepayment
standard  or model. The  model used in this  Prospectus Supplement, the Standard
Prepayment Assumption ("SPA"),  represents an  assumed rate  of prepayment  each
month  relative  to the  then outstanding  principal  balance of  a pool  of new
mortgage loans. A prepayment assumption of 100% SPA assumes constant  prepayment
rates  of  0.2% per  annum of  the  then outstanding  principal balance  of such
mortgage loans in  the first  month of  the life of  the mortgage  loans and  an
additional  0.2% per annum  in each month thereafter  until the thirtieth month.
Beginning in the thirtieth month and in each month thereafter during the life of
the mortgage loans, 100% SPA assumes a constant prepayment rate of 6% per  annum
each  month. As used in the table below, "0% SPA" assumes prepayment rates equal
to  0%  of  SPA,  I.E.,  no  prepayments.  Correspondingly,  "75%  SPA"  assumes
prepayment rates equal to 75% of SPA, and so forth. SPA DOES NOT PURPORT TO BE A
HISTORICAL   DESCRIPTION  OF  PREPAYMENT  EXPERIENCE  OR  A  PREDICTION  OF  THE
ANTICIPATED RATE OF  PREPAYMENT OF  ANY POOL  OF MORTGAGE  LOANS, INCLUDING  THE
MORTGAGE LOANS.
 
    The  tables  set  forth  below  have  been  prepared  on  the  basis  of the
characteristics of the Mortgage  Loans that are expected  to be included in  the
Trust  Estate, as described above under "Description of the Mortgage Loans." The
tables assume, among other things, that (i) the scheduled payment in each  month
for each Mortgage Loan has been based on its outstanding balance as of the first
day of the month preceding the month of such payment, its Mortgage Interest Rate
and its remaining term to stated maturity, so that such scheduled payments would
amortize the remaining balance by its remaining term to maturity, (ii) scheduled
monthly  payments of principal and interest on the Mortgage Loans will be timely
received on  the first  day of  each  month (with  no defaults),  commencing  in
September  1996,  (iii) the  Seller does  not repurchase  any Mortgage  Loan, as
described under "Description of  the Mortgage Loans  -- Mandatory Repurchase  or
Substitution  of Mortgage  Loans" herein, and  the Seller does  not exercise its
option to purchase  the Mortgage Loans  and thereby cause  a termination of  the
Trust  Estate, (iv) principal prepayments in full  on the Mortgage Loans will be
received on  the  last day  of  each month  commencing  in August  1996  at  the
respective  constant percentages of SPA set forth in the tables and there are no
partial principal prepayments or Prepayment Interest Shortfalls, (v) the  Series
1996-4  Certificates will be issued on August 27, 1996 and (vi) distributions to
Certificateholders will be  made on the  25th day of  each month, commencing  in
September 1996.
 
                                      S-90
<PAGE>
    IT  IS HIGHLY UNLIKELY THAT  THE MORTGAGE LOANS WILL  PREPAY AT ANY CONSTANT
RATE, THAT ALL OF THE  MORTGAGE LOANS WILL PREPAY AT  THE SAME RATE OR THAT  THE
MORTGAGE  LOANS  WILL  NOT EXPERIENCE  ANY  LOSSES.  In addition,  there  may be
differences  between  the  characteristics  of  the  mortgage  loans  ultimately
included  in the  Trust Estate and  the Mortgage  Loans which are  assumed to be
included, as described above. Any difference may have an effect upon the  actual
percentages  of initial Class A Subclass  Principal Balance of the Subclasses of
Class A Certificates, initial principal balances of the Class M Certificates and
initial Class  B  Subclass  Principal  Balance of  the  Subclasses  of  Class  B
Certificates outstanding, the actual weighted average lives of the Subclasses of
Class  A Certificates, the  Class M Certificates  and the Subclasses  of Class B
Certificates and the date on which the Class A Subclass Principal Balance of any
Subclass of  Class  A  Certificates,  the  principal  balance  of  the  Class  M
Certificates and the Class B Subclass Principal Balance of any Subclass of Class
B Certificates are reduced to zero.
 
    Based  upon  the foregoing  assumptions, the  following tables  indicate the
weighted average life of  each Subclass and Class  of Offered Certificates,  and
set  forth the percentages of the initial  Class A Subclass Principal Balance of
each such  Subclass,  the initial  Class  M Principal  Balance  of the  Class  M
Certificates and the initial Class B Subclass Principal Balance of each Subclass
of  Offered Class  B Certificates  that would be  outstanding after  each of the
dates shown at constant percentages of SPA presented.
 
                                      S-91
<PAGE>
   PERCENTAGE OF INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                                             CLASS A-1
                                                                        CERTIFICATES AT THE
                                                                       FOLLOWING PERCENTAGES
                                                                              OF SPA
            DISTRIBUTION              ---------------------------------------------------------------------------------------
                DATE                     0%          75%         150%         235%         300%         400%         500%
<S>                                   <C>        <C>          <C>          <C>          <C>          <C>          <C>
- ------------------------------------  ---------------------------------------------------------------------------------------
Initial.............................        100         100          100          100          100          100          100
August 1997.........................         99          97           94           92           90           87           84
August 1998.........................         98          90           83           75           69           60           51
August 1999.........................         96          82           69           55           44           30           19
August 2000.........................         95          74           56           37           25           11            0
August 2001.........................         93          67           44           23           12            0            0
August 2002.........................         91          60           34           14            2            0            0
August 2003.........................         90          53           26            6            0            0            0
August 2004.........................         87          47           20            0            0            0            0
August 2005.........................         85          42           14            0            0            0            0
August 2006.........................         83          36           10            0            0            0            0
August 2007.........................         80          31            6            0            0            0            0
August 2008.........................         77          27            2            0            0            0            0
August 2009.........................         74          23            0            0            0            0            0
August 2010.........................         71          20            0            0            0            0            0
August 2011.........................         67          16            0            0            0            0            0
August 2012.........................         63          13            0            0            0            0            0
August 2013.........................         59           9            0            0            0            0            0
August 2014.........................         54           6            0            0            0            0            0
August 2015.........................         49           3            0            0            0            0            0
August 2016.........................         44           0            0            0            0            0            0
August 2017.........................         38           0            0            0            0            0            0
August 2018.........................         31           0            0            0            0            0            0
August 2019.........................         25           0            0            0            0            0            0
August 2020.........................         19           0            0            0            0            0            0
August 2021.........................         13           0            0            0            0            0            0
August 2022.........................          6           0            0            0            0            0            0
August 2023.........................          0           0            0            0            0            0            0
August 2024.........................          0           0            0            0            0            0            0
August 2025.........................          0           0            0            0            0            0            0
August 2026.........................          0           0            0            0            0            0            0
Weighted Average
  Life (years) (1)..................      17.42        8.49         5.10         3.55         2.95         2.41         2.07
 
<CAPTION>
                                                                              CLASS A-2
                                                                         CERTIFICATES AT THE
                                                                        FOLLOWING PERCENTAGES
                                                                               OF SPA
            DISTRIBUTION              -----------------------------------------------------------------------------------------
                DATE                      0%           75%         150%         235%         300%         400%         500%
<S>                                   <C>        <C>        <C>        <C>        <C>          <C>          <C>
- ------------------------------------  -----------------------------------------------------------------------------------------
Initial.............................
                                             100          100          100          100          100          100          100
 
August 1997.........................
                                             100          100          100          100          100          100          100
 
August 1998.........................
                                             100          100          100          100          100          100          100
 
August 1999.........................
                                             100          100          100          100          100          100          100
 
August 2000.........................
                                             100          100          100          100          100          100          100
 
August 2001.........................
                                             100          100          100          100          100          100            0
 
August 2002.........................
                                             100          100          100          100          100            0            0
 
August 2003.........................
                                              89           89           89           89           33            0            0
 
August 2004.........................
                                               0            0            0            0            0            0            0
 
August 2005.........................
                                               0            0            0            0            0            0            0
 
August 2006.........................
                                               0            0            0            0            0            0            0
 
August 2007.........................
                                               0            0            0            0            0            0            0
 
August 2008.........................
                                               0            0            0            0            0            0            0
 
August 2009.........................
                                               0            0            0            0            0            0            0
 
August 2010.........................
                                               0            0            0            0            0            0            0
 
August 2011.........................
                                               0            0            0            0            0            0            0
 
August 2012.........................
                                               0            0            0            0            0            0            0
 
August 2013.........................
                                               0            0            0            0            0            0            0
 
August 2014.........................
                                               0            0            0            0            0            0            0
 
August 2015.........................
                                               0            0            0            0            0            0            0
 
August 2016.........................
                                               0            0            0            0            0            0            0
 
August 2017.........................
                                               0            0            0            0            0            0            0
 
August 2018.........................
                                               0            0            0            0            0            0            0
 
August 2019.........................
                                               0            0            0            0            0            0            0
 
August 2020.........................
                                               0            0            0            0            0            0            0
 
August 2021.........................
                                               0            0            0            0            0            0            0
 
August 2022.........................
                                               0            0            0            0            0            0            0
 
August 2023.........................
                                               0            0            0            0            0            0            0
 
August 2024.........................
                                               0            0            0            0            0            0            0
 
August 2025.........................
                                               0            0            0            0            0            0            0
 
August 2026.........................
                                               0            0            0            0            0            0            0
 
Weighted Average
 
  Life (years) (1)..................        7.44         7.44         7.44         7.44         7.00         5.47         4.54
 
<CAPTION>
                                                                          CLASS A-3
                                                                     CERTIFICATES AT THE
                                                                    FOLLOWING PERCENTAGES
                                                                           OF SPA
            DISTRIBUTION              ---------------------------------------------------------------------------------
                DATE                     0%         75%       150%       235%        300%         400%         500%
- ------------------------------------  ---------------------------------------------------------------------------------
Initial.............................
 
                                            100        100        100        100         100          100          100
August 1997.........................
 
                                            100        100        100        100         100          100          100
August 1998.........................
 
                                            100        100        100        100         100          100          100
August 1999.........................
 
                                            100        100        100        100         100          100          100
August 2000.........................
 
                                            100        100        100        100         100          100           99
August 2001.........................
 
                                            100        100        100        100         100           96           31
August 2002.........................
 
                                            100        100        100        100         100           46            0
August 2003.........................
 
                                            100        100        100        100          85           11            0
August 2004.........................
 
                                            100        100        100        100          55            0            0
August 2005.........................
 
                                            100        100        100         90          34            0            0
August 2006.........................
 
                                            100        100        100         70          20            0            0
August 2007.........................
 
                                            100        100        100         53           9            0            0
August 2008.........................
 
                                            100        100        100         38           0            0            0
August 2009.........................
 
                                            100        100         99         26           0            0            0
August 2010.........................
 
                                            100        100         93         16           0            0            0
August 2011.........................
 
                                            100        100         78          7           0            0            0
August 2012.........................
 
                                            100        100         63          0           0            0            0
August 2013.........................
 
                                            100        100         51          0           0            0            0
August 2014.........................
 
                                            100        100         39          0           0            0            0
August 2015.........................
 
                                            100        100         28          0           0            0            0
August 2016.........................
 
                                            100        100         19          0           0            0            0
August 2017.........................
 
                                            100         96         10          0           0            0            0
August 2018.........................
 
                                            100         82          2          0           0            0            0
August 2019.........................
 
                                            100         65          0          0           0            0            0
August 2020.........................
 
                                            100         50          0          0           0            0            0
August 2021.........................
 
                                            100         34          0          0           0            0            0
August 2022.........................
 
                                            100         19          0          0           0            0            0
August 2023.........................
 
                                             98          4          0          0           0            0            0
August 2024.........................
 
                                             58          0          0          0           0            0            0
August 2025.........................
 
                                              7          0          0          0           0            0            0
August 2026.........................
 
                                              0          0          0          0           0            0            0
Weighted Average
 
  Life (years) (1)..................      28.19      24.02      17.35      11.53        8.59         6.04         4.80
</TABLE>
 
- ------------------
(1) The weighted average  life of an  Offered Certificate is  determined by  (i)
    multiplying  the  amount  of  each distribution  in  reduction  of principal
    balance by  the number  of  years from  the date  of  the issuance  of  such
    Certificate  to the related  Distribution Date, (ii)  adding the results and
    (iii) dividing  the  sum by  the  aggregate distributions  in  reduction  of
    principal balance referred to in clause (i).
 
 *   Indicates a percentage greater than zero  but less than 0.5% of the initial
principal balance of such Subclass or Class.
 
                                      S-92
<PAGE>
   PERCENTAGE OF INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                        CLASS A-4                                               CLASS A-5
                                                   CERTIFICATES AT THE                                     CERTIFICATES AT THE
                                                  FOLLOWING PERCENTAGES                                   FOLLOWING PERCENTAGES
                                                         OF SPA                                                  OF SPA
    DISTRIBUTION      -----------------------------------------------------------------------------  -------------------------------
        DATE             0%         75%       150%       235%       300%       400%        500%         0%         75%       150%
<S>                   <C>        <C>        <C>        <C>        <C>        <C>        <C>          <C>        <C>        <C>
- --------------------  -----------------------------------------------------------------------------  -------------------------------
Initial.............        100        100        100        100        100        100         100
                                                                                                           100        100        100
August 1997.........        100        100        100        100        100        100         100
                                                                                                            99         99         99
August 1998.........        100        100        100        100        100        100         100
                                                                                                            98         98         98
August 1999.........        100        100        100        100        100        100         100
                                                                                                            97         97         97
August 2000.........        100        100        100        100        100        100         100
                                                                                                            96         96         96
August 2001.........        100        100        100        100        100        100         100
                                                                                                            95         95         95
August 2002.........        100        100        100        100        100        100          67
                                                                                                            94         93         91
August 2003.........        100        100        100        100        100        100           2
                                                                                                            93         90         87
August 2004.........        100        100        100        100        100         77           0
                                                                                                            91         86         81
August 2005.........        100        100        100        100        100         49           0
                                                                                                            90         81         73
August 2006.........        100        100        100        100        100         36           0
                                                                                                            88         76         66
August 2007.........        100        100        100        100        100         27           0
                                                                                                            86         71         58
August 2008.........        100        100        100        100         99         20           0
                                                                                                            84         66         52
August 2009.........        100        100        100        100         79         15           0
                                                                                                            82         62         46
August 2010.........        100        100        100        100         63         11           0
                                                                                                            79         57         41
August 2011.........        100        100        100        100         50          8           0
                                                                                                            77         53         36
August 2012.........        100        100        100         97         40          6           0
                                                                                                            74         49         31
August 2013.........        100        100        100         80         31          4           0
                                                                                                            71         44         27
August 2014.........        100        100        100         66         24          3           0
                                                                                                            67         40         24
August 2015.........        100        100        100         53         19          2           0
                                                                                                            64         37         20
August 2016.........        100        100        100         43         15          2           0
                                                                                                            60         33         17
August 2017.........        100        100        100         34         11          1           0
                                                                                                            56         29         15
August 2018.........        100        100        100         27          8          1           0
                                                                                                            51         26         12
August 2019.........        100        100         88         21          6          1           0
                                                                                                            46         22         10
August 2020.........        100        100         71         16          4          *           0
                                                                                                            41         19          8
August 2021.........        100        100         55         12          3          *           0
                                                                                                            35         15          6
August 2022.........        100        100         41          8          2          *           0
                                                                                                            29         12          5
August 2023.........        100        100         29          6          1          *           0
                                                                                                            22          9          3
August 2024.........        100         70         18          3          1          *           0
                                                                                                            15          6          2
August 2025.........        100         31          7          1          *          *           0
                                                                                                             7          2          1
August 2026.........          0          0          0          0          0          0           0
                                                                                                             0          0          0
Weighted Average
  Life (years)
  (1)...............      29.53      28.56      25.63      20.22      16.10      10.20        6.29       20.41      16.17      13.53
 
<CAPTION>
                                                                                                CLASS A-6
                                                                                           CERTIFICATES AT THE
                                                                                          FOLLOWING PERCENTAGES
                                                                                                 OF SPA
    DISTRIBUTION                                                      -------------------------------------------------------------
        DATE            235%       300%        400%         500%         0%          75%         150%         235%         300%
<S>                   <C>          <C>
- --------------------                                                  -------------------------------------------------------------
Initial.............
                            100        100         100          100
                                                                            100         100          100          100          100
August 1997.........
                             99         99          99           99
                                                                             99          97           95           93           91
August 1998.........
                             98         98          98           98
                                                                             98          91           85           78           73
August 1999.........
                             97         97          97           97
                                                                             97          84           72           60           51
August 2000.........
                             96         96          96           96
                                                                             95          77           61           44           32
August 2001.........
                             95         95          95           95
                                                                             94          70           50           30           17
August 2002.........
                             90         89          87           84
                                                                             92          64           41           19            6
August 2003.........
                             83         81          77           72
                                                                             91          59           33           11            0
August 2004.........
                             75         70          64           45
                                                                             89          53           26            4            0
August 2005.........
                             65         59          50           29
                                                                             87          48           20            0            0
August 2006.........
                             55         48          38           20
                                                                             85          44           15            0            0
August 2007.........
                             46         38          28           14
                                                                             82          39           11            0            0
August 2008.........
                             39         31          21            9
                                                                             80          35            6            0            0
August 2009.........
                             32         24          15            6
                                                                             77          30            3            0            0
August 2010.........
                             27         19          11            4
                                                                             74          26            0            0            0
August 2011.........
                             22         15           8            3
                                                                             71          22            0            0            0
August 2012.........
                             19         12           6            2
                                                                             67          18            0            0            0
August 2013.........
                             15         10           4            1
                                                                             64          14            0            0            0
August 2014.........
                             13          7           3            1
                                                                             59          11            0            0            0
August 2015.........
                             10          6           2            1
                                                                             55           7            0            0            0
August 2016.........
                              8          4           2            *
                                                                             50           4            0            0            0
August 2017.........
                              7          3           1            *
                                                                             45           *            0            0            0
August 2018.........
                              5          3           1            *
                                                                             39           0            0            0            0
August 2019.........
                              4          2           1            *
                                                                             33           0            0            0            0
August 2020.........
                              3          1           *            *
                                                                             26           0            0            0            0
August 2021.........
                              2          1           *            *
                                                                             19           0            0            0            0
August 2022.........
                              2          1           *            *
                                                                             10           0            0            0            0
August 2023.........
                              1          *           *            *
                                                                              2           0            0            0            0
August 2024.........
                              1          *           *            *
                                                                              0           0            0            0            0
August 2025.........
                              *          *           *            *
                                                                              0           0            0            0            0
August 2026.........
                              0          0           0            0
                                                                              0           0            0            0            0
Weighted Average
 
  Life (years)
  (1)...............      11.62      10.64        9.58         8.32       18.35        9.49         5.73         3.92         3.23
 
<CAPTION>
 
    DISTRIBUTION
        DATE             400%         500%
- --------------------
Initial.............
 
                             100          100
August 1997.........
 
                              88           86
August 1998.........
 
                              65           57
August 1999.........
 
                              38           25
August 2000.........
 
                              16            3
August 2001.........
 
                               *            0
August 2002.........
 
                               0            0
August 2003.........
 
                               0            0
August 2004.........
 
                               0            0
August 2005.........
 
                               0            0
August 2006.........
 
                               0            0
August 2007.........
 
                               0            0
August 2008.........
 
                               0            0
August 2009.........
 
                               0            0
August 2010.........
 
                               0            0
August 2011.........
 
                               0            0
August 2012.........
 
                               0            0
August 2013.........
 
                               0            0
August 2014.........
 
                               0            0
August 2015.........
 
                               0            0
August 2016.........
 
                               0            0
August 2017.........
 
                               0            0
August 2018.........
 
                               0            0
August 2019.........
 
                               0            0
August 2020.........
 
                               0            0
August 2021.........
 
                               0            0
August 2022.........
 
                               0            0
August 2023.........
 
                               0            0
August 2024.........
 
                               0            0
August 2025.........
 
                               0            0
August 2026.........
 
                               0            0
Weighted Average
 
  Life (years)
  (1)...............        2.61         2.24
</TABLE>
 
- ------------------
(1) The weighted average  life of an  Offered Certificate is  determined by  (i)
    multiplying  the  amount  of  each distribution  in  reduction  of principal
    balance by  the number  of  years from  the date  of  the issuance  of  such
    Certificate  to the related  Distribution Date, (ii)  adding the results and
    (iii) dividing  the  sum by  the  aggregate distributions  in  reduction  of
    principal balance referred to in clause (i).
 
 *   Indicates a percentage greater than zero  but less than 0.5% of the initial
principal balance of such Subclass or Class.
 
                                      S-93
<PAGE>
   PERCENTAGE OF INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                                                                               CLASS A-8
                                                                                                               CERTIFICATES
                                                             CLASS A-7                                         AT THE
                                                        CERTIFICATES AT THE                                    FOLLOWING
                                                       FOLLOWING PERCENTAGES                                   PERCENTAGES
                                                              OF SPA                                            OF SPA
    DISTRIBUTION      ---------------------------------------------------------------------------------------  ---------
        DATE             0%          75%         150%         235%         300%         400%         500%         0%
<S>                   <C>        <C>          <C>          <C>          <C>          <C>          <C>          <C>
- --------------------  ---------------------------------------------------------------------------------------  ---------
Initial.............        100         100          100          100          100          100          100
                                                                                                                     100
August 1997.........         99          97           95           93           93           93           91
                                                                                                                      98
August 1998.........         98          92           86           79           78           71           63
                                                                                                                      97
August 1999.........         97          85           73           61           57           45           31
                                                                                                                      95
August 2000.........         96          78           62           46           39           21            4
                                                                                                                      93
August 2001.........         94          71           52           31           22            2            0
                                                                                                                      90
August 2002.........         93          65           43           18            9            0            0
                                                                                                                      88
August 2003.........         91          60           34            8            0            0            0
                                                                                                                      85
August 2004.........         89          55           26            0            0            0            0
                                                                                                                      82
August 2005.........         87          50           19            0            0            0            0
                                                                                                                      79
August 2006.........         85          45           13            0            0            0            0
                                                                                                                      75
August 2007.........         83          41            8            0            0            0            0
                                                                                                                      72
August 2008.........         81          36            3            0            0            0            0
                                                                                                                      68
August 2009.........         78          31            0            0            0            0            0
                                                                                                                      63
August 2010.........         75          26            0            0            0            0            0
                                                                                                                      58
August 2011.........         72          21            0            0            0            0            0
                                                                                                                      53
August 2012.........         68          17            0            0            0            0            0
                                                                                                                      47
August 2013.........         65          12            0            0            0            0            0
                                                                                                                      41
August 2014.........         61           8            0            0            0            0            0
                                                                                                                      35
August 2015.........         56           4            0            0            0            0            0
                                                                                                                      27
August 2016.........         52           0            0            0            0            0            0
                                                                                                                      19
August 2017.........         47           0            0            0            0            0            0
                                                                                                                      11
August 2018.........         41           0            0            0            0            0            0
                                                                                                                       2
August 2019.........         34           0            0            0            0            0            0
                                                                                                                       0
August 2020.........         26           0            0            0            0            0            0
                                                                                                                       0
August 2021.........         17           0            0            0            0            0            0
                                                                                                                       0
August 2022.........          8           0            0            0            0            0            0
                                                                                                                       0
August 2023.........          0           0            0            0            0            0            0
                                                                                                                       0
August 2024.........          0           0            0            0            0            0            0
                                                                                                                       0
August 2025.........          0           0            0            0            0            0            0
                                                                                                                       0
August 2026.........          0           0            0            0            0            0            0
                                                                                                                       0
Weighted Average
  Life (years)
  (1)...............      18.45        9.48         5.68         3.90         3.51         2.84         2.43       14.32
 
<CAPTION>
 
                                                                                                         CLASS A-9
                                                                                                    CERTIFICATES AT THE
                                                                                                         FOLLOWING
                                                                                                        PERCENTAGES
                                                                                                           OF SPA
    DISTRIBUTION                                                                                    --------------------
        DATE              75%         150%         235%         300%         400%         500%         0%         75%
<S>                   <C>          <C>          <C>          <C>          <C>
- --------------------                                                                                --------------------
Initial.............
                             100          100          100          100          100          100
                                                                                                          100        100
August 1997.........
                              95           92           88           88           88           85
                                                                                                          100        100
August 1998.........
                              86           76           64           64           51           39
                                                                                                          100        100
August 1999.........
                              74           55           35           29            8            0
                                                                                                          100        100
August 2000.........
                              63           37           10            0            0            0
                                                                                                          100        100
August 2001.........
                              52           20            0            0            0            0
                                                                                                          100        100
August 2002.........
                              42            5            0            0            0            0
                                                                                                          100        100
August 2003.........
                              33            0            0            0            0            0
                                                                                                          100        100
August 2004.........
                              24            0            0            0            0            0
                                                                                                          100        100
August 2005.........
                              16            0            0            0            0            0
                                                                                                          100        100
August 2006.........
                               9            0            0            0            0            0
                                                                                                          100        100
August 2007.........
                               2            0            0            0            0            0
                                                                                                          100        100
August 2008.........
                               0            0            0            0            0            0
                                                                                                          100         90
August 2009.........
                               0            0            0            0            0            0
                                                                                                          100         78
August 2010.........
                               0            0            0            0            0            0
                                                                                                          100         65
August 2011.........
                               0            0            0            0            0            0
                                                                                                          100         54
August 2012.........
                               0            0            0            0            0            0
                                                                                                          100         42
August 2013.........
                               0            0            0            0            0            0
                                                                                                          100         31
August 2014.........
                               0            0            0            0            0            0
                                                                                                          100         20
August 2015.........
                               0            0            0            0            0            0
                                                                                                          100          9
August 2016.........
                               0            0            0            0            0            0
                                                                                                          100          0
August 2017.........
                               0            0            0            0            0            0
                                                                                                          100          0
August 2018.........
                               0            0            0            0            0            0
                                                                                                          100          0
August 2019.........
                               0            0            0            0            0            0
                                                                                                           85          0
August 2020.........
                               0            0            0            0            0            0
                                                                                                           65          0
August 2021.........
                               0            0            0            0            0            0
                                                                                                           43          0
August 2022.........
                               0            0            0            0            0            0
                                                                                                           19          0
August 2023.........
                               0            0            0            0            0            0
                                                                                                            0          0
August 2024.........
                               0            0            0            0            0            0
                                                                                                            0          0
August 2025.........
                               0            0            0            0            0            0
                                                                                                            0          0
August 2026.........
                               0            0            0            0            0            0
                                                                                                            0          0
Weighted Average
 
  Life (years)
  (1)...............        5.52         3.37         2.50         2.36         2.00         1.76       24.66      15.43
 
<CAPTION>
 
    DISTRIBUTION
        DATE             150%         235%         300%         400%         500%
- --------------------
Initial.............
 
                             100          100          100          100          100
August 1997.........
 
                             100          100          100          100          100
August 1998.........
 
                             100          100          100          100          100
August 1999.........
 
                             100          100          100          100           78
August 2000.........
 
                             100          100           99           52           11
August 2001.........
 
                             100           77           54            4            0
August 2002.........
 
                             100           46           21            0            0
August 2003.........
 
                              86           20            0            0            0
August 2004.........
 
                              65            0            0            0            0
August 2005.........
 
                              48            0            0            0            0
August 2006.........
 
                              33            0            0            0            0
August 2007.........
 
                              20            0            0            0            0
August 2008.........
 
                               7            0            0            0            0
August 2009.........
 
                               0            0            0            0            0
August 2010.........
 
                               0            0            0            0            0
August 2011.........
 
                               0            0            0            0            0
August 2012.........
 
                               0            0            0            0            0
August 2013.........
 
                               0            0            0            0            0
August 2014.........
 
                               0            0            0            0            0
August 2015.........
 
                               0            0            0            0            0
August 2016.........
 
                               0            0            0            0            0
August 2017.........
 
                               0            0            0            0            0
August 2018.........
 
                               0            0            0            0            0
August 2019.........
 
                               0            0            0            0            0
August 2020.........
 
                               0            0            0            0            0
August 2021.........
 
                               0            0            0            0            0
August 2022.........
 
                               0            0            0            0            0
August 2023.........
 
                               0            0            0            0            0
August 2024.........
 
                               0            0            0            0            0
August 2025.........
 
                               0            0            0            0            0
August 2026.........
 
                               0            0            0            0            0
Weighted Average
 
  Life (years)
  (1)...............        9.13         6.00         5.25         4.11         3.45
</TABLE>
 
- ------------------
(1) The weighted average  life of an  Offered Certificate is  determined by  (i)
    multiplying  the  amount  of  each distribution  in  reduction  of principal
    balance by  the number  of  years from  the date  of  the issuance  of  such
    Certificate  to the related  Distribution Date, (ii)  adding the results and
    (iii) dividing  the  sum by  the  aggregate distributions  in  reduction  of
    principal balance referred to in clause (i).
 
 *   Indicates a percentage greater than zero  but less than 0.5% of the initial
principal balance of such Subclass or Class.
 
                                      S-94
<PAGE>
   PERCENTAGE OF INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                                             CLASS A-10
                                                                         CERTIFICATES AT THE
                                                                        FOLLOWING PERCENTAGES
                                                                               OF SPA
            DISTRIBUTION              -----------------------------------------------------------------------------------------
                DATE                      0%           75%         150%         235%         300%         400%         500%
<S>                                   <C>          <C>          <C>          <C>          <C>          <C>          <C>
- ------------------------------------  -----------------------------------------------------------------------------------------
Initial.............................         100          100          100          100          100          100          100
August 1997.........................          83           83           83           83           83           83           83
August 1998.........................          65           65           65           65           65           65           65
August 1999.........................          45           45           45           45           45           45           45
August 2000.........................          23           23           23           23           23           23           23
August 2001.........................           0            0            0            0            0            0            0
August 2002.........................           0            0            0            0            0            0            0
August 2003.........................           0            0            0            0            0            0            0
August 2004.........................           0            0            0            0            0            0            0
August 2005.........................           0            0            0            0            0            0            0
August 2006.........................           0            0            0            0            0            0            0
August 2007.........................           0            0            0            0            0            0            0
August 2008.........................           0            0            0            0            0            0            0
August 2009.........................           0            0            0            0            0            0            0
August 2010.........................           0            0            0            0            0            0            0
August 2011.........................           0            0            0            0            0            0            0
August 2012.........................           0            0            0            0            0            0            0
August 2013.........................           0            0            0            0            0            0            0
August 2014.........................           0            0            0            0            0            0            0
August 2015.........................           0            0            0            0            0            0            0
August 2016.........................           0            0            0            0            0            0            0
August 2017.........................           0            0            0            0            0            0            0
August 2018.........................           0            0            0            0            0            0            0
August 2019.........................           0            0            0            0            0            0            0
August 2020.........................           0            0            0            0            0            0            0
August 2021.........................           0            0            0            0            0            0            0
August 2022.........................           0            0            0            0            0            0            0
August 2023.........................           0            0            0            0            0            0            0
August 2024.........................           0            0            0            0            0            0            0
August 2025.........................           0            0            0            0            0            0            0
August 2026.........................           0            0            0            0            0            0            0
Weighted Average
  Life (years) (1)..................        2.70         2.70         2.70         2.70         2.70         2.70         2.63
 
<CAPTION>
 
                                                                     CERTIFICATES AT THE                                 FOLLOWING
                                                                    FOLLOWING PERCENTAGES                                PERCENTAGES
                                                                           OF SPA                                         OF SPA
            DISTRIBUTION              ---------------------------------------------------------------------------------  ---------
                DATE                     0%         75%       150%       235%        300%         400%         500%         0%
<S>                                   <C>        <C>        <C>        <C>          <C>          <C>
- ------------------------------------  ---------------------------------------------------------------------------------  ---------
Initial.............................
                                            100        100        100        100         100          100          100
                                                                                                                               100
August 1997.........................
                                            108        108        108        108         108           50            0
                                                                                                                                97
August 1998.........................
                                            117        117        117        117           0            0            0
                                                                                                                                94
August 1999.........................
                                            126        126        126        126           0            0            0
                                                                                                                                91
August 2000.........................
                                            136        136        136        136           0            0            0
                                                                                                                                87
August 2001.........................
                                            147        147        147        147           0            0            0
                                                                                                                                84
August 2002.........................
                                            159        159        159        159           0            0            0
                                                                                                                                80
August 2003.........................
                                            172        172        172        172           0            0            0
                                                                                                                                75
August 2004.........................
                                            186        186        186        186           0            0            0
                                                                                                                                70
August 2005.........................
                                            200        200        200        200           0            0            0
                                                                                                                                65
August 2006.........................
                                            217        217        217        217           0            0            0
                                                                                                                                60
August 2007.........................
                                            234        234        234        234           0            0            0
                                                                                                                                54
August 2008.........................
                                            253        253        253        253           0            0            0
                                                                                                                                47
August 2009.........................
                                            273        273        273        273           0            0            0
                                                                                                                                40
August 2010.........................
                                            295        295        295        295           0            0            0
                                                                                                                                33
August 2011.........................
                                            319        319        319        319           0            0            0
                                                                                                                                24
August 2012.........................
                                            344        344        344        344           0            0            0
                                                                                                                                15
August 2013.........................
                                            372        372        372        372           0            0            0
                                                                                                                                 6
August 2014.........................
                                            389        389        389        362           0            0            0
                                                                                                                                 0
August 2015.........................
                                            389        389        389        294           0            0            0
                                                                                                                                 0
August 2016.........................
                                            389        389        389        237           0            0            0
                                                                                                                                 0
August 2017.........................
                                            389        389        389        190           0            0            0
                                                                                                                                 0
August 2018.........................
                                            389        389        389        150           0            0            0
                                                                                                                                 0
August 2019.........................
                                            389        389        389        116           0            0            0
                                                                                                                                 0
August 2020.........................
                                            389        389        389         89           0            0            0
                                                                                                                                 0
August 2021.........................
                                            389        389        305         65           0            0            0
                                                                                                                                 0
August 2022.........................
                                            389        389        228         46           0            0            0
                                                                                                                                 0
August 2023.........................
                                            389        389        159         30           0            0            0
                                                                                                                                 0
August 2024.........................
                                            389        387         97         17           0            0            0
                                                                                                                                 0
August 2025.........................
                                            389        171         41          7           0            0            0
                                                                                                                                 0
August 2026.........................
                                              0          0          0          0           0            0            0
                                                                                                                                 0
Weighted Average
 
  Life (years) (1)..................      29.63      28.94      26.65      21.67        1.80         1.03         0.77       10.76
 
<CAPTION>
 
            DISTRIBUTION
                DATE                     75%       150%       235%        300%         400%         500%
- ------------------------------------
Initial.............................
 
                                            100        100        100         100          100          100
August 1997.........................
 
                                             97         97         97          51            0            0
August 1998.........................
 
                                             94         94         94           0            0            0
August 1999.........................
 
                                             91         91         91           0            0            0
August 2000.........................
 
                                             87         87         87           0            0            0
August 2001.........................
 
                                             84         84         84           0            0            0
August 2002.........................
 
                                             80         80         80           0            0            0
August 2003.........................
 
                                             75         75         75           0            0            0
August 2004.........................
 
                                             70         70         70           0            0            0
August 2005.........................
 
                                             65         65         65           0            0            0
August 2006.........................
 
                                             60         60         60           0            0            0
August 2007.........................
 
                                             54         54         54           0            0            0
August 2008.........................
 
                                             47         47         47           0            0            0
August 2009.........................
 
                                             40         40         40           0            0            0
August 2010.........................
 
                                             33         33         33           0            0            0
August 2011.........................
 
                                             24         24         24           0            0            0
August 2012.........................
 
                                             15         15         15           0            0            0
August 2013.........................
 
                                              6          6          6           0            0            0
August 2014.........................
 
                                              0          0          0           0            0            0
August 2015.........................
 
                                              0          0          0           0            0            0
August 2016.........................
 
                                              0          0          0           0            0            0
August 2017.........................
 
                                              0          0          0           0            0            0
August 2018.........................
 
                                              0          0          0           0            0            0
August 2019.........................
 
                                              0          0          0           0            0            0
August 2020.........................
 
                                              0          0          0           0            0            0
August 2021.........................
 
                                              0          0          0           0            0            0
August 2022.........................
 
                                              0          0          0           0            0            0
August 2023.........................
 
                                              0          0          0           0            0            0
August 2024.........................
 
                                              0          0          0           0            0            0
August 2025.........................
 
                                              0          0          0           0            0            0
August 2026.........................
 
                                              0          0          0           0            0            0
Weighted Average
 
  Life (years) (1)..................      10.76      10.76      10.76        0.99         0.57         0.42
</TABLE>
 
- ------------------
(1) The weighted average  life of an  Offered Certificate is  determined by  (i)
    multiplying  the  amount  of  each distribution  in  reduction  of principal
    balance by  the number  of  years from  the date  of  the issuance  of  such
    Certificate  to the related  Distribution Date, (ii)  adding the results and
    (iii) dividing  the  sum by  the  aggregate distributions  in  reduction  of
    principal balance referred to in clause (i).
 
 *   Indicates a percentage greater than zero  but less than 0.5% of the initial
principal balance of such Subclass or Class.
 
                                      S-95
<PAGE>
   PERCENTAGE OF INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                                           CLASS A-14
                                                                       CERTIFICATES AT THE
                                                                      FOLLOWING PERCENTAGES
                                                                             OF SPA
            DISTRIBUTION              -------------------------------------------------------------------------------------
                DATE                     0%         75%        150%         235%         300%         400%         500%
<S>                                   <C>        <C>        <C>          <C>          <C>          <C>          <C>
- ------------------------------------  -------------------------------------------------------------------------------------
Initial.............................        100        100         100          100          100          100          100
August 1997.........................        100        100         100          100          100          100          100
August 1998.........................        100        100         100          100          100          100          100
August 1999.........................        100        100         100          100          100          100           78
August 2000.........................        100        100         100          100           99           52           11
August 2001.........................        100        100         100           77           54            4            0
August 2002.........................        100        100         100           46           21            0            0
August 2003.........................        100        100          86           20            0            0            0
August 2004.........................        100        100          65            0            0            0            0
August 2005.........................        100        100          48            0            0            0            0
August 2006.........................        100        100          33            0            0            0            0
August 2007.........................        100        100          20            0            0            0            0
August 2008.........................        100         90           7            0            0            0            0
August 2009.........................        100         78           0            0            0            0            0
August 2010.........................        100         65           0            0            0            0            0
August 2011.........................        100         54           0            0            0            0            0
August 2012.........................        100         42           0            0            0            0            0
August 2013.........................        100         31           0            0            0            0            0
August 2014.........................        100         20           0            0            0            0            0
August 2015.........................        100          9           0            0            0            0            0
August 2016.........................        100          0           0            0            0            0            0
August 2017.........................        100          0           0            0            0            0            0
August 2018.........................        100          0           0            0            0            0            0
August 2019.........................         85          0           0            0            0            0            0
August 2020.........................         65          0           0            0            0            0            0
August 2021.........................         43          0           0            0            0            0            0
August 2022.........................         19          0           0            0            0            0            0
August 2023.........................          0          0           0            0            0            0            0
August 2024.........................          0          0           0            0            0            0            0
August 2025.........................          0          0           0            0            0            0            0
August 2026.........................          0          0           0            0            0            0            0
Weighted Average
  Life (years) (1)..................      24.66      15.43        9.13         6.00         5.25         4.11         3.45
 
<CAPTION>
                                                                            CLASS A-15
                                                                        CERTIFICATES AT THE
                                                                       FOLLOWING PERCENTAGES
                                                                              OF SPA
            DISTRIBUTION              ---------------------------------------------------------------------------------------
                DATE                     0%          75%         150%         235%         300%         400%         500%
<S>                                   <C>          <C>          <C>          <C>          <C>          <C>          <C>
- ------------------------------------  ---------------------------------------------------------------------------------------
Initial.............................
                                            100         100          100          100          100          100          100
 
August 1997.........................
                                             99          97           94           92           92           92           89
 
August 1998.........................
                                             98          90           83           75           75           65           57
 
August 1999.........................
                                             96          82           68           54           49           35           23
 
August 2000.........................
                                             95          74           55           36           29           15            3
 
August 2001.........................
                                             93          66           43           23           16            1            0
 
August 2002.........................
                                             91          59           33           13            6            0            0
 
August 2003.........................
                                             89          53           25            6            0            0            0
 
August 2004.........................
                                             87          46           19            0            0            0            0
 
August 2005.........................
                                             85          41           14            0            0            0            0
 
August 2006.........................
                                             83          35           10            0            0            0            0
 
August 2007.........................
                                             80          30            6            0            0            0            0
 
August 2008.........................
                                             77          26            2            0            0            0            0
 
August 2009.........................
                                             74          23            0            0            0            0            0
 
August 2010.........................
                                             70          19            0            0            0            0            0
 
August 2011.........................
                                             67          16            0            0            0            0            0
 
August 2012.........................
                                             63          12            0            0            0            0            0
 
August 2013.........................
                                             58           9            0            0            0            0            0
 
August 2014.........................
                                             54           6            0            0            0            0            0
 
August 2015.........................
                                             48           3            0            0            0            0            0
 
August 2016.........................
                                             43           0            0            0            0            0            0
 
August 2017.........................
                                             37           0            0            0            0            0            0
 
August 2018.........................
                                             30           0            0            0            0            0            0
 
August 2019.........................
                                             25           0            0            0            0            0            0
 
August 2020.........................
                                             19           0            0            0            0            0            0
 
August 2021.........................
                                             13           0            0            0            0            0            0
 
August 2022.........................
                                              6           0            0            0            0            0            0
 
August 2023.........................
                                              0           0            0            0            0            0            0
 
August 2024.........................
                                              0           0            0            0            0            0            0
 
August 2025.........................
                                              0           0            0            0            0            0            0
 
August 2026.........................
                                              0           0            0            0            0            0            0
 
Weighted Average
 
  Life (years) (1)..................      17.33        8.41         5.05         3.52         3.20         2.61         2.25
 
<CAPTION>
                                                                             CLASS A-16
                                                                         CERTIFICATES AT THE
                                                                        FOLLOWING PERCENTAGES
                                                                               OF SPA
            DISTRIBUTION              -----------------------------------------------------------------------------------------
 
                DATE                      0%           75%         150%         235%         300%         400%         500%
 
- ------------------------------------  -----------------------------------------------------------------------------------------
 
Initial.............................
 
                                             100          100          100          100          100          100          100
 
August 1997.........................
 
                                             100          100          100          100          100          100          100
 
August 1998.........................
 
                                             100          100          100          100          100          100          100
 
August 1999.........................
 
                                             100          100          100          100          100          100          100
 
August 2000.........................
 
                                             100          100          100          100          100          100          100
 
August 2001.........................
 
                                             100          100          100          100          100          100            0
 
August 2002.........................
 
                                              49           49           49           49           49            0            0
 
August 2003.........................
 
                                               0            0            0            0            0            0            0
 
August 2004.........................
 
                                               0            0            0            0            0            0            0
 
August 2005.........................
 
                                               0            0            0            0            0            0            0
 
August 2006.........................
 
                                               0            0            0            0            0            0            0
 
August 2007.........................
 
                                               0            0            0            0            0            0            0
 
August 2008.........................
 
                                               0            0            0            0            0            0            0
 
August 2009.........................
 
                                               0            0            0            0            0            0            0
 
August 2010.........................
 
                                               0            0            0            0            0            0            0
 
August 2011.........................
 
                                               0            0            0            0            0            0            0
 
August 2012.........................
 
                                               0            0            0            0            0            0            0
 
August 2013.........................
 
                                               0            0            0            0            0            0            0
 
August 2014.........................
 
                                               0            0            0            0            0            0            0
 
August 2015.........................
 
                                               0            0            0            0            0            0            0
 
August 2016.........................
 
                                               0            0            0            0            0            0            0
 
August 2017.........................
 
                                               0            0            0            0            0            0            0
 
August 2018.........................
 
                                               0            0            0            0            0            0            0
 
August 2019.........................
 
                                               0            0            0            0            0            0            0
 
August 2020.........................
 
                                               0            0            0            0            0            0            0
 
August 2021.........................
 
                                               0            0            0            0            0            0            0
 
August 2022.........................
 
                                               0            0            0            0            0            0            0
 
August 2023.........................
 
                                               0            0            0            0            0            0            0
 
August 2024.........................
 
                                               0            0            0            0            0            0            0
 
August 2025.........................
 
                                               0            0            0            0            0            0            0
 
August 2026.........................
 
                                               0            0            0            0            0            0            0
 
Weighted Average
 
  Life (years) (1)..................        6.00         6.00         6.00         6.00         6.00         5.26         4.40
 
</TABLE>
 
- ------------------
(1) The weighted average  life of an  Offered Certificate is  determined by  (i)
    multiplying  the  amount  of  each distribution  in  reduction  of principal
    balance by  the number  of  years from  the date  of  the issuance  of  such
    Certificate  to the related  Distribution Date, (ii)  adding the results and
    (iii) dividing  the  sum by  the  aggregate distributions  in  reduction  of
    principal balance referred to in clause (i).
 *  Indicates  a percentage greater than zero but  less than 0.5% of the initial
    principal balance of such Subclass or Class.
 
                                      S-96
<PAGE>
   PERCENTAGE OF INITIAL SUBCLASS OR CLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                                      CLASS A-R AND CLASS A-LR
                                                                         CERTIFICATES AT THE
                                                                        FOLLOWING PERCENTAGES
                                                                               OF SPA
            DISTRIBUTION              -----------------------------------------------------------------------------------------
                DATE                      0%           75%         150%         235%         300%         400%         500%
<S>                                   <C>          <C>          <C>          <C>          <C>          <C>          <C>
- ------------------------------------  -----------------------------------------------------------------------------------------
Initial.............................         100          100          100          100          100          100          100
August 1997.........................           0            0            0            0            0            0            0
August 1998.........................           0            0            0            0            0            0            0
August 1999.........................           0            0            0            0            0            0            0
August 2000.........................           0            0            0            0            0            0            0
August 2001.........................           0            0            0            0            0            0            0
August 2002.........................           0            0            0            0            0            0            0
August 2003.........................           0            0            0            0            0            0            0
August 2004.........................           0            0            0            0            0            0            0
August 2005.........................           0            0            0            0            0            0            0
August 2006.........................           0            0            0            0            0            0            0
August 2007.........................           0            0            0            0            0            0            0
August 2008.........................           0            0            0            0            0            0            0
August 2009.........................           0            0            0            0            0            0            0
August 2010.........................           0            0            0            0            0            0            0
August 2011.........................           0            0            0            0            0            0            0
August 2012.........................           0            0            0            0            0            0            0
August 2013.........................           0            0            0            0            0            0            0
August 2014.........................           0            0            0            0            0            0            0
August 2015.........................           0            0            0            0            0            0            0
August 2016.........................           0            0            0            0            0            0            0
August 2017.........................           0            0            0            0            0            0            0
August 2018.........................           0            0            0            0            0            0            0
August 2019.........................           0            0            0            0            0            0            0
August 2020.........................           0            0            0            0            0            0            0
August 2021.........................           0            0            0            0            0            0            0
August 2022.........................           0            0            0            0            0            0            0
August 2023.........................           0            0            0            0            0            0            0
August 2024.........................           0            0            0            0            0            0            0
August 2025.........................           0            0            0            0            0            0            0
August 2026.........................           0            0            0            0            0            0            0
Weighted Average
  Life (years) (1)..................        0.08         0.08         0.08         0.08         0.08         0.08         0.08
 
<CAPTION>
                                                             CLASS M, CLASS B-1 AND CLASS B-2
                                                                    CERTIFICATES AT THE
                                                                   FOLLOWING PERCENTAGES
                                                                          OF SPA
            DISTRIBUTION              -------------------------------------------------------------------------------
                DATE                     0%         75%       150%       235%       300%        400%         500%
<S>                                   <C>        <C>        <C>        <C>        <C>        <C>          <C>
- ------------------------------------  -------------------------------------------------------------------------------
Initial.............................
                                            100        100        100        100        100         100          100
August 1997.........................
                                             99         99         99         99         99          99           99
August 1998.........................
                                             98         98         98         98         98          98           98
August 1999.........................
                                             97         97         97         97         97          97           97
August 2000.........................
                                             96         96         96         96         96          96           96
August 2001.........................
                                             95         95         95         95         95          95           95
August 2002.........................
                                             94         93         91         90         89          87           84
August 2003.........................
                                             93         90         87         83         81          77           72
August 2004.........................
                                             91         86         81         75         70          64           58
August 2005.........................
                                             90         81         73         65         59          50           43
August 2006.........................
                                             88         76         66         55         48          38           29
August 2007.........................
                                             86         71         58         46         38          28           20
August 2008.........................
                                             84         66         52         39         31          21           14
August 2009.........................
                                             82         62         46         32         24          15            9
August 2010.........................
                                             79         57         41         27         19          11            6
August 2011.........................
                                             77         53         36         22         15           8            4
August 2012.........................
                                             74         49         31         19         12           6            3
August 2013.........................
                                             71         44         27         15         10           4            2
August 2014.........................
                                             67         40         24         13          7           3            1
August 2015.........................
                                             64         37         20         10          6           2            1
August 2016.........................
                                             60         33         17          8          4           2            1
August 2017.........................
                                             56         29         15          7          3           1            *
August 2018.........................
                                             51         26         12          5          3           1            *
August 2019.........................
                                             46         22         10          4          2           1            *
August 2020.........................
                                             41         19          8          3          1           *            *
August 2021.........................
                                             35         15          6          2          1           *            *
August 2022.........................
                                             29         12          5          2          1           *            *
August 2023.........................
                                             22          9          3          1          *           *            *
August 2024.........................
                                             15          6          2          1          *           *            *
August 2025.........................
                                              7          2          1          *          *           *            *
August 2026.........................
                                              0          0          0          0          0           0            0
Weighted Average
 
  Life (years) (1)..................      20.41      16.17      13.53      11.62      10.64        9.58         8.86
</TABLE>
 
- ------------------
(1) The weighted average  life of an  Offered Certificate is  determined by  (i)
    multiplying  the  amount  of  each distribution  in  reduction  of principal
    balance by  the number  of  years from  the date  of  the issuance  of  such
    Certificate  to the related  Distribution Date, (ii)  adding the results and
    (iii) dividing  the  sum by  the  aggregate distributions  in  reduction  of
    principal balance referred to in clause (i).
 *  Indicates  a percentage greater than zero but  less than 0.5% of the initial
    principal balance of such Subclass or Class.
 
                                      S-97
<PAGE>
    Based on the assumptions set forth in  the last paragraph on page S-90,  but
assuming  that no prepayments  are experienced on the  Mortgage Loans, the final
Distribution Date  for the  Class A-2,  Class A-10,  Class A-13  and Class  A-16
Certificates  would occur in August 2004, August 2001, April 2014 and July 2003,
respectively. Depending on the characteristics  and performance of the  Mortgage
Loans,  the actual final Distribution  Date of the Class  A-2, Class A-10, Class
A-13 and Class A-16 Certificates may be earlier or later (perhaps substantially)
than the date referred to in the preceding sentence.
 
    Interest accrued on the  Class A, Class M  and Offered Class B  Certificates
will  be  reduced by  the amount  of  any interest  portions of  Realized Losses
allocated  to  such  Certificates  as   described  under  "Description  of   the
Certificates  -- Interest" herein. The yield on the Class A, Class M and Offered
Class B Certificates  will be less  than the yield  otherwise produced by  their
respective  Pass-Through Rates  and the  prices at  which such  Certificates are
purchased because the interest which accrues  on the Mortgage Loans during  each
month will not be passed through to Certificateholders until the 25th day of the
month  following the end  of such month (or  if such 25th day  is not a business
day, the following business day).
 
    The Seller  intends  to  file  certain additional  yield  tables  and  other
computational  materials  with respect  to one  or more  Subclasses or  Class of
Offered Certificates with the Securities and Exchange Commission in a Report  on
Form  8-K.  See  "Incorporation  Of  Certain  Documents  By  Reference"  in  the
Prospectus. Such tables and materials will have been prepared by the Underwriter
at the request of certain  prospective investors, based on assumptions  provided
by,  and satisfying the special requirements of, such investors. Such tables and
assumptions may be  based on assumptions  that differ from  the assumptions  set
forth  in clauses (i)  through (vi) of  the last paragraph  on page S-90 hereof.
Accordingly, such  tables  and  other  materials  may  not  be  relevant  to  or
appropriate for investors other than those specifically requesting them.
 
HISTORIC LOSS EXPERIENCE OF PHMC-SERVICED MORTGAGE LOANS
 
    The  historic  experience  of  PHMC, which  prior  to  the  PHMC Acquisition
serviced certain of the  Mortgage Loans now serviced  by Norwest Mortgage  under
its  Underlying  Servicing Agreement,  indicates that  the cumulative  amount of
losses and the frequency  of liquidations experienced by  PHMC on its  servicing
portfolio of securitized(1) conventional mortgage loans having original terms to
stated maturity of approximately 30 years ("30 Year Mortgage Loans") have varied
based on the year of origination as set forth below.
 
<TABLE>
<CAPTION>
                                                                    LIQUIDATION       LOSS
                             YEAR OF                                 FREQUENCY      SEVERITY
                           ORIGINATION                             PERCENTAGE(A)  PERCENTAGES(B)
                          ------------                             -------------  -------------
<S>                                                                <C>            <C>
1989.............................................................         9.28%         44.91%
1990.............................................................         5.27%         42.75%
1991.............................................................         2.98%         33.97%
1992.............................................................         0.86%         33.37%
1993.............................................................         0.21%         28.16%
1994.............................................................         0.08%         19.94%
</TABLE>
 
- ------------------------
(a) The  liquidation frequency percentage is determined by dividing the original
    principal balance of  liquidated 30  Year Mortgage  Loans originated  during
    such  year  by the  original  principal balance  of  30 Year  Mortgage Loans
    originated during such year.
 
(b) The loss severity percentage is determined by dividing the amount of  losses
    resulting from liquidated 30 Year Mortgage Loans originated during such year
    by  the  original principal  balance of  liquidated  30 Year  Mortgage Loans
    originated during such year.
 
- ------------------------
(1) Mortgage loans  which were  sold by  PHMC and  included in  a mortgage  pool
    underlying  a  series of  The Prudential  Home Mortgage  Securities Company,
    Inc.'s mortgage pass-through certificates.
 
                                      S-98
<PAGE>
    The loss severity percentages for the  more recent years of origination  may
not  be representative of  the loss severity  percentages in the  future for the
indicated years  of  origination in  part  because the  severity  of loss  on  a
liquidated mortgage loan is generally expected to increase as the length of time
increases  from  the initial  delinquency  of such  mortgage  loan to  the final
disposition of the mortgaged property. In addition, it is possible that  because
the more recent loss severity percentages resulted from relatively low levels of
liquidations (which do not include those mortgage loans currently delinquent but
not  yet liquidated) such  percentages may not be  representative of future loss
severity percentages arising from the liquidation of a larger number of mortgage
loans. The frequency  of liquidations of  the Mortgage Loans  and the amount  of
loss  experienced as a  result thereof may vary  significantly from the historic
experience of  PHMC  in  part  because the  underwriting  standards  applied  at
origination of the 30 Year Mortgage Loans, including the Mortgage Loans formerly
serviced  by PHMC, have changed over time. Similarly, PHMC's servicing practices
with respect  to  delinquent Mortgage  Loans  changed over  time.  In  addition,
delinquencies, foreclosures and loan losses generally are expected to occur with
increasing  frequency after the first full year  of the life of a mortgage loan.
Many factors contribute to  the severity of losses,  particularly the length  of
time from the initial delinquency of such mortgage loan to the final disposition
of  the mortgaged  property and  the state  in which  the mortgaged  property is
located. The Seller and Norwest Mortgage make no representation that the  actual
losses  and liquidation  frequency experienced  on the  Mortgage Loans currently
serviced by Norwest  Mortgage, on  the Mortgage Loans  generally (which  include
Mortgage  Loans serviced by Other Servicers) or on the Mortgage Loans originated
by Norwest  Mortgage  or  a  Norwest Mortgage  Correspondent  will  in  any  way
correspond  to PHMC's historic experience on  its servicing portfolio of 30 Year
Mortgage Loans.
 
YIELD CONSIDERATIONS WITH RESPECT TO THE CLASS B-1 AND CLASS B-2 CERTIFICATES
 
    Defaults on mortgage loans may be measured relative to a default standard or
model. The  model  used in  this  Prospectus Supplement,  the  standard  default
assumption ("SDA"), represents an assumed rate of default each month relative to
the  then-outstanding performing  principal balance  of a  pool of  new mortgage
loans. A default assumption of 100% SDA assumes constant default rates of  0.02%
per  annum of the  then-outstanding principal balance of  such mortgage loans in
the first month of the  life of the mortgage loans  and an additional 0.02%  per
annum in each month thereafter until the 30th month. Beginning in the 30th month
and  in each month thereafter through the 60th month of the life of the mortgage
loans, 100% SDA assumes a constant default  rate of 0.60% per annum each  month.
Beginning in the 61st month and in each month thereafter through the 120th month
of  the life of the  mortgage loans, 100% SDA  assumes that the constant default
rate declines each  month by 0.0095%  per annum, and  that the constant  default
rate  remains at 0.03%  per annum in each  month after the  120th month. For the
purposes of the following tables, it is  assumed that there is no delay  between
the  default and  liquidation of  the mortgage loans.  As used  in the following
tables, "0%  SDA"  assumes default  rates  equal to  0%  of SDA  (no  defaults).
Correspondingly,  "75% SDA" assumes  default rates equal  to 75% of  SDA, and so
forth. SDA does not purport to be a historical description of default experience
or a prediction  of the  anticipated rate  of default  of any  pool of  mortgage
loans, including the Mortgage Loans.
 
    The  following  tables  indicate the  sensitivity  of the  pre-tax  yield to
maturity on  the  Class B-1  and  Class B-2  Certificates  to various  rates  of
prepayment and varying levels of aggregate Realized Losses. The tables set forth
below  are based upon, among other things,  the assumptions set forth in clauses
(i) through (vi)  of the  last paragraph  on page  S-90 hereof  (other than  the
assumption  that no  defaults shall have  occurred with respect  to the Mortgage
Loans) and  the  additional  assumptions that  liquidations  (other  than  those
scenarios  indicated as 0% of SDA (no  defaults)) occur monthly (other than on a
Due Date) at the percentages of SDA set forth in the table.
 
    In addition, it was assumed that (i) Realized Losses on liquidations of  25%
or  50% of the outstanding principal  balance of such liquidated Mortgage Loans,
as indicated in the tables below  (referred to as a "Loss Severity  Percentage")
will  occur at the time of liquidation, (ii) there are no Special Hazard Losses,
Fraud  Losses  or  Bankruptcy  Losses,  (iii)  the  Class  B-1  and  Class   B-2
Certificates are purchased
 
                                      S-99
<PAGE>
on  August  27, 1996  at assumed  purchase  prices equal  to 99.00%  and 95.25%,
respectively, of the Class  B Subclass Principal  Balances thereof plus  accrued
interest  from August 1,  1996 to (but  not including) August  27, 1996 and (iv)
that there were no delinquencies on the Mortgage Loans.
 
    It is unlikely that the Mortgage Loans will have the precise characteristics
referred to herein or  that they will  prepay or liquidate at  any of the  rates
specified.  The assumed percentages of SDA and SPA shown in the tables below are
for illustrative  purposes only  and the  Seller makes  no representations  with
respect  to the reasonableness of  such assumptions or that  the actual rates of
prepayment and liquidation and  loss severity experience  of the Mortgage  Loans
will  in any way correspond to any of the assumptions made herein. Consequently,
there can be no assurance  that the pre-tax yield to  maturity of the Class  B-1
and  Class B-2 Certificates will  correspond to any of  the pre-tax yields shown
below.
 
    The pre-tax yields  set forth  in the  following tables  were calculated  by
determining  the  monthly  discount rates  which,  when applied  to  the assumed
streams of cash flows to  be paid on the Class  B-1 and Class B-2  Certificates,
would  cause the discounted present value of  such assumed streams of cash flows
to equal the aggregate assumed  purchase prices of the  Class B-1 and Class  B-2
Certificates set forth below. In all cases, monthly rates were then converted to
the  semi-annual corporate bond  equivalent yields shown  below. Implicit in the
use of any discounted present value or internal rate of return calculations such
as these is the  assumption that intermediate cash  flows are reinvested at  the
discount  rate or internal rate of return.  Thus, these calculations do not take
into account the  different interest  rates at which  investors may  be able  to
reinvest  funds received by them as distributions on the Class B-1 and Class B-2
Certificates. Consequently, these  yields do  not purport to  reflect the  total
return  on any investment in the Class  B-1 and Class B-2 Certificates when such
reinvestment rates are considered.
 
           SENSITIVITY OF PRE-TAX YIELDS TO MATURITY OF THE CLASS B-1
                CERTIFICATES TO PREPAYMENTS AND REALIZED LOSSES
 
<TABLE>
<CAPTION>
                           LOSS                       PERCENTAGES OF SPA
PERCENTAGE               SEVERITY    -----------------------------------------------------
OF SDA                  PERCENTAGE    0%      75%    150%    235%    300%    400%    500%
- ----------------------  ----------   -----   -----   -----   -----   -----   -----   -----
<S>                     <C>          <C>     <C>     <C>     <C>     <C>     <C>     <C>
  0%..................     N/A       7.93%   7.93%   7.94%   7.95%   7.95%   7.95%   7.96%
 25%..................      25%      7.93%   7.94%   7.94%   7.95%   7.95%   7.95%   7.96%
 25%..................      50%      7.93%   7.94%   7.94%   7.95%   7.95%   7.95%   7.96%
 50%..................      25%      7.93%   7.94%   7.94%   7.95%   7.95%   7.95%   7.96%
 50%..................      50%      7.92%   7.94%   7.94%   7.95%   7.95%   7.95%   7.96%
 75%..................      25%      7.92%   7.94%   7.94%   7.95%   7.95%   7.95%   7.96%
 75%..................      50%      7.92%   7.93%   7.94%   7.95%   7.95%   7.95%   7.96%
100%..................      25%      7.92%   7.94%   7.94%   7.95%   7.95%   7.95%   7.96%
100%..................      50%      7.92%   7.93%   7.94%   7.95%   7.95%   7.95%   7.96%
150%..................      25%      7.92%   7.94%   7.94%   7.95%   7.95%   7.95%   7.96%
150%..................      50%      5.17%   7.39%   7.94%   7.95%   7.95%   7.95%   7.96%
200%..................      25%      7.92%   7.93%   7.94%   7.95%   7.95%   7.95%   7.96%
200%..................      50%      (16.84)% 1.79%  5.35%   7.64%   7.95%   7.95%   7.96%
</TABLE>
 
                                     S-100
<PAGE>
           SENSITIVITY OF PRE-TAX YIELDS TO MATURITY OF THE CLASS B-2
                CERTIFICATES TO PREPAYMENTS AND REALIZED LOSSES
 
<TABLE>
<CAPTION>
                           LOSS                         PERCENTAGES OF SPA
PERCENTAGE               SEVERITY    --------------------------------------------------------
OF SDA                  PERCENTAGE     0%       75%     150%    235%    300%    400%    500%
- ----------------------  ----------   -------   ------   -----   -----   -----   -----   -----
<S>                     <C>          <C>       <C>      <C>     <C>     <C>     <C>     <C>
  0%..................     N/A         8.34%    8.40%   8.45%   8.50%   8.53%   8.57%   8.60%
 25%..................      25%        8.32%    8.41%   8.45%   8.50%   8.53%   8.57%   8.60%
 25%..................      50%        8.31%    8.41%   8.46%   8.50%   8.53%   8.57%   8.60%
 50%..................      25%        8.31%    8.41%   8.46%   8.50%   8.53%   8.57%   8.60%
 50%..................      50%        8.29%    8.38%   8.46%   8.51%   8.53%   8.57%   8.60%
 75%..................      25%        8.29%    8.42%   8.46%   8.51%   8.53%   8.57%   8.60%
 75%..................      50%        7.42%    8.33%   8.46%   8.51%   8.53%   8.57%   8.60%
100%..................      25%        8.29%    8.39%   8.46%   8.51%   8.53%   8.57%   8.60%
100%..................      50%        3.38%    6.06%   7.59%   8.51%   8.54%   8.57%   8.61%
150%..................      25%        7.53%    8.33%   8.46%   8.51%   8.53%   8.58%   8.60%
150%..................      50%      (26.47)%  (20.65)% 0.04%   3.70%   5.46%   8.14%   8.60%
200%..................      25%        3.79%    6.25%   7.73%   8.51%   8.54%   8.57%   8.61%
200%..................      50%      (40.39)%  (36.56)% (31.85)% (23.87)% (2.19)% 2.23% 6.15%
</TABLE>
 
    The following table sets forth the  amount of Realized Losses that would  be
incurred  with respect to the  Mortgage Loans, expressed as  a percentage of the
aggregate outstanding principal balance of the Mortgage Loans as of the  Cut-Off
Date.
 
                           AGGREGATE REALIZED LOSSES
 
<TABLE>
<CAPTION>
                           LOSS                       PERCENTAGES OF SPA
PERCENTAGE               SEVERITY    -----------------------------------------------------
OF SDA                  PERCENTAGE    0%      75%    150%    235%    300%    400%    500%
- ----------------------  ----------   -----   -----   -----   -----   -----   -----   -----
<S>                     <C>          <C>     <C>     <C>     <C>     <C>     <C>     <C>
 25%..................      25%      0.25%   0.21%   0.18%   0.15%   0.13%   0.11%   0.09%
 25%..................      50%      0.49%   0.41%   0.35%   0.30%   0.26%   0.22%   0.19%
 50%..................      25%      0.49%   0.41%   0.35%   0.29%   0.26%   0.22%   0.19%
 50%..................      50%      0.99%   0.82%   0.70%   0.59%   0.52%   0.44%   0.37%
 75%..................      25%      0.74%   0.61%   0.52%   0.44%   0.39%   0.33%   0.28%
 75%..................      50%      1.47%   1.23%   1.04%   0.88%   0.78%   0.66%   0.56%
100%..................      25%      0.98%   0.81%   0.69%   0.59%   0.52%   0.44%   0.37%
100%..................      50%      1.95%   1.63%   1.39%   1.17%   1.04%   0.87%   0.74%
150%..................      25%      1.45%   1.21%   1.03%   0.87%   0.77%   0.65%   0.55%
150%..................      50%      2.90%   2.42%   2.06%   1.75%   1.55%   1.30%   1.10%
200%..................      25%      1.92%   1.60%   1.37%   1.16%   1.03%   0.86%   0.73%
200%..................      50%      3.83%   3.21%   2.73%   2.31%   2.05%   1.72%   1.46%
</TABLE>
 
    Notwithstanding  the assumed  percentages of SDA,  Loss Severity Percentages
and prepayment rates reflected  in the preceding tables,  it is highly  unlikely
that  the Mortgage  Loans will be  prepaid or  that the Realized  Losses will be
incurred according to one particular pattern.  For this reason, and because  the
timing  of cash flows is  critical to determining yields,  the pre-tax yields to
maturity on the Class B-1 and Class  B-2 Certificates are likely to differ  from
those  shown in the  tables. There can  be no assurance  that the Mortgage Loans
will prepay at any particular rate or  that Realized Losses will be incurred  at
any  particular  level  or  that the  yields  on  the Class  B-1  and  Class B-2
Certificates will conform to any of the yields described herein.
 
    Investors are  urged  to make  their  investment decisions  based  on  their
determinations as to anticipated rates of prepayment and Realized Losses under a
variety  of scenarios. Investors in Class  B-1 and Class B-2 Certificates should
fully consider the risk that Realized Losses on the Mortgage Loans could  result
in the failure of such investors to fully recover their investments.
 
                                     S-101
<PAGE>
                        POOLING AND SERVICING AGREEMENT
GENERAL
 
    The  Series 1996-4  Certificates will  be issued  pursuant to  a Pooling and
Servicing Agreement to be dated as of the date of initial issuance of the Series
1996-4 Certificates (the  "Pooling and Servicing  Agreement") among the  Seller,
the  Master Servicer, the Trust Administrator and the Trustee. Reference is made
to the Prospectus for important  additional information regarding the terms  and
conditions  of  the  Pooling  and  Servicing  Agreement  and  the  Series 1996-4
Certificates. See "Description of the Certificates," "Servicing of the  Mortgage
Loans" and "The Pooling and Servicing Agreement" in the Prospectus.
 
    The  Trust Estate  created pursuant to  the Pooling  and Servicing Agreement
will consist of (i)  the Mortgage Loans as  described under "Description of  the
Mortgage  Loans,"  (ii) such  assets  as from  time  to time  are  identified as
deposited in any account held for  the benefit of the Certificateholders,  (iii)
any  Mortgaged  Properties  acquired  on  behalf  of  the  Certificateholders by
foreclosure or  by  deed in  lieu  of foreclosure  after  the date  of  original
issuance  of the Certificates and (iv) the  rights of the Trustee to receive the
proceeds of all insurance policies and performance bonds, if any, required to be
maintained pursuant to the Pooling and Servicing Agreement.
 
DISTRIBUTIONS
 
    Distributions (other  than  the  final distribution  in  retirement  of  the
Offered  Certificates of each Class or Subclass) will be made by check mailed to
the address of  the person  entitled thereto as  it appears  on the  Certificate
Register.  However,  with  respect  to  any  holder  of  an  Offered Certificate
evidencing at least a $5,000,000  initial principal balance, distributions  will
be  made  on the  Distribution Date  by wire  transfer in  immediately available
funds, provided that the Master Servicer,  or the paying agent acting on  behalf
of  the  Master  Servicer, shall  have  been furnished  with  appropriate wiring
instructions not less than seven business days prior to the related Distribution
Date. The final  distribution in respect  of each Class  or Subclass of  Offered
Certificates  will be made  only upon presentation and  surrender of the related
Certificate at the office  or agency appointed by  the Trustee specified in  the
notice of final distribution with respect to the related Subclass or Class.
 
    Unless  Definitive Certificates  are issued  as described  above, the Master
Servicer and  the  Trustee  will treat  DTC  as  the Holder  of  the  Book-Entry
Certificates for all purposes, including making distributions thereon and taking
actions  with  respect thereto.  DTC will  make  book-entry transfers  among its
participants with respect to the  Book-Entry Certificates; it will also  receive
distributions  on the Book-Entry Certificates from the Trustee and transmit them
to participants for distribution to Beneficial Owners or their nominees.
 
VOTING
 
    With respect  to  any provisions  of  the Pooling  and  Servicing  Agreement
providing  for the  action, consent  or approval  of the  holders of  all Series
1996-4 Certificates evidencing specified Voting  Interests in the Trust  Estate,
the  holders of  the Class  A Certificates  will collectively  be entitled  to a
percentage (the  "Class A  Voting Interest")  of the  aggregate Voting  Interest
represented  by  all Series  1996-4 Certificates  equal  to the  sum of  (A) the
product of  (i)  the then  applicable  Class A  Percentage  and (ii)  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) (the "Non-PO  Voting
Interest")  and (B) the Pool Balance (PO Portion) divided by the sum of the Pool
Balance (Non-PO Portion) and the Pool  Balance (PO Portion); the holders of  the
Class  M  Certificates  will  collectively be  entitled  to  the then-applicable
percentage of the  aggregate Voting  Interest represented by  all Series  1996-4
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  the  holders of  the  Class  B  Certificates  will
collectively  be  entitled  to  the balance  of  the  aggregate  Voting Interest
represented by all Series 1996-4  Certificates (the "Class B Voting  Interest").
The  aggregate Voting Interest of  each Subclass of Class  A Certificates on any
date will be equal  to the product of  (a) the Class A  Voting Interest on  such
date  represented by clause (A) above and  (b) the fraction obtained by dividing
the Class A Subclass Principal Balance of such
 
                                     S-102
<PAGE>
Subclass less,  in  the case  of  the  Class A-12  Certificates,  the  Component
Principal  Balance of the  Class A-12 PO Component  on such date  by the Class A
Non-PO Principal Balance on such date. In addition to the Voting Interest of the
Class A-12 Certificates  determined in accordance  with the preceding  sentence,
the  Class A-12  Certificates will  be entitled to  the Class  A Voting Interest
represented by clause (B) above. The aggregate Voting Interest of each  Subclass
of  Class B Certificates  on any date  will be equal  to the product  of (a) the
Class B Voting Interest on such date  and (b) the fraction obtained by  dividing
the  Class B  Subclass Principal Balance  of such  Subclass on such  date by the
Class B Principal  Balance on such  date. 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 of the Pooling and Servicing Agreement providing
for action, consent  or approval of  each Class or  Subclass of Certificates  or
specified  Subclasses of Certificates, each Certificateholder of a Subclass will
have a  Voting  Interest  in such  Class  or  Subclass equal  to  such  holder's
Percentage  Interest in such  Class or Subclass.  Unless Definitive Certificates
are issued as described above, Beneficial Owners of Book-Entry Certificates  may
exercise their voting rights only through Participants.
 
TRUSTEE
 
    The  Trustee for the Series 1996-4  Certificates will be First Bank National
Association, a national banking association.  The corporate trust office of  the
Trustee  is located  at 180  East Fifth Street,  St. Paul,  Minnesota 55101. The
Trustee will be responsible for monitoring the compliance of the Master Servicer
with  the  Pooling  and  Servicing   Agreement  and  the  Underlying   Servicing
Agreements.  See "The  Pooling and  Servicing Agreement  -- The  Trustee" in the
Prospectus. In addition, the Trustee will be required to make Periodic  Advances
to  the  limited extent  described  herein with  respect  to the  Mortgage Loans
serviced by Norwest Mortgage if Norwest  Mortgage, as Servicer, fails to make  a
Periodic  Advance required  by the  related Underlying  Servicing Agreement. See
"Description of the Certificates -- Periodic Advances" herein.
 
MASTER SERVICER
 
    Norwest Bank will  act as "Master  Servicer" of the  Mortgage Loans and,  in
that  capacity, will  supervise the servicing  of the Mortgage  Loans, cause the
Mortgage Loans  to be  serviced in  the event  a Servicer  is terminated  and  a
successor  servicer is  not appointed,  provide certain  reports to  the Trustee
regarding the Mortgage Loans and the Certificates and make Periodic Advances  to
the  limited extent  described herein  with respect to  the Mortgage  Loans if a
Servicer other than Norwest Mortgage fails  to make a Periodic Advance  required
by  the  related Underlying  Servicing Agreement.  The  Master Servicer  will be
entitled to a "Master Servicing Fee" payable monthly equal to the product of (i)
1/12th of  0.02%  (the "Master  Servicing  Fee  Rate") and  (ii)  the  aggregate
Scheduled  Principal Balances of the Mortgage Loans  as of the first day of each
month. The Master  Servicer will pay  all administrative expenses  to the  Trust
Estate  subject to  reimbursement as  described under  "Master Servicer"  in the
Prospectus.
 
SPECIAL SERVICING AGREEMENTS
 
    The Pooling and Servicing Agreement may permit the Master Servicer to  enter
into  a special servicing agreement with an unaffiliated holder of a Subclass of
Class B Certificates or of a  class of securities representing interests in  the
Class   B   Certificates   and/or  other   subordinated   mortgage  pass-through
certificates. Pursuant to such an agreement, such holder may instruct the Master
Servicer to instruct  the Servicers, to  the extent provided  in the  applicable
Underlying Servicing Agreement to commence or delay foreclosure proceedings with
respect  to  delinquent  Mortgage  Loans. Such  commencement  or  delay  at such
holder's direction will be taken by  the Master Servicer only after such  holder
deposits  a specified amount of cash with the Master Servicer. Such cash will be
available for  distribution to  Certificateholders if  Liquidation Proceeds  are
less than they otherwise may have been had the Servicers acted pursuant to their
normal servicing procedures.
 
                                     S-103
<PAGE>
OPTIONAL TERMINATION
 
    At  its option,  the Seller may  purchase from  the Trust Estate  all of the
Mortgage Loans,  and  thereby  effect  early retirement  of  the  Series  1996-4
Certificates, on any Distribution Date when the Pool Scheduled Principal Balance
is  less than  10% of  the Cut-Off  Date Aggregate  Principal Balance.  Any such
purchase will be made only in connection with a "qualified liquidation" of  each
of  the  Upper-Tier REMIC  and Lower-Tier  REMIC within  the meaning  of Section
860F(a)(4)(A) of the  Code. The purchase  price will generally  be equal to  the
unpaid  principal balance of  each Mortgage Loan  plus the fair  market value of
other property  (including  any  Mortgaged  Property title  to  which  has  been
acquired  by the Trust Estate ("REO Property")) in the Trust Estate plus accrued
interest. In  the event  the  Trust Estate  is  liquidated as  described  above,
holders of the Certificates, to the extent funds are available, will receive the
unpaid  principal  balance  of their  Certificates  and any  accrued  and unpaid
interest thereon. The amount, if any, remaining in the Certificate Account after
the payment of all  principal and interest on  the Certificates and expenses  of
the  Lower-Tier  REMIC will  be  distributed to  the  holder of  the  Class A-LR
Certificate. See "Description of  the Certificates --  Additional Rights of  the
Class  A-R  and  Class  A-LR Certificateholders"  herein  and  "The  Pooling and
Servicing  Agreement  --  Termination;  Purchase  of  Mortgage  Loans"  in   the
Prospectus.  The exercise of the  foregoing option will be  in the Seller's sole
discretion. Without limitation, the Seller may enter into agreements with  third
parties to (i) exercise such option at the direction of such third party or (ii)
forbear from the exercise of such option.
 
                        SERVICING OF THE MORTGAGE LOANS
 
    Norwest   Mortgage  will  service  approximately  70.74%  (by  Cut-Off  Date
Aggregate Principal  Balance) of  the  Mortgage Loans  and the  other  servicers
listed below (the "Other Servicers", and collectively with Norwest Mortgage, the
"Servicers")  will service the balance of the Mortgage Loans, as indicated, each
pursuant to a separate Underlying Servicing Agreement. The rights to enforce the
related Servicer's obligations  under each Underlying  Servicing Agreement  with
respect to the related Mortgage Loans will be assigned to the Trustee, on behalf
of  the Trustee, for the benefit  of Certificateholders. Among other things, the
Servicers are  obligated  under  certain  circumstances  to  advance  delinquent
payments  of  principal and  interest with  respect to  the Mortgage  Loans. See
"Servicing of the Mortgage Loans" in the Prospectus.
 
THE SERVICERS
 
    The Mortgage Loans initially will be serviced by the following entities:
 
<TABLE>
<CAPTION>
                                                                       APPROXIMATE PERCENTAGE OF CUT-OFF
                                                                       DATE AGGREGATE PRINCIPAL BALANCE
NAME OF SERVICER                                                                   SERVICED
- ---------------------------------------------------------------------  ---------------------------------
<S>                                                                    <C>
Norwest Mortgage, Inc. ..............................................                  70.74%
Citicorp Mortgage, Inc. .............................................                  11.03
Suntrust Mortgage, Inc. .............................................                   9.04
HomeSide Lending.....................................................                   7.82
First Union Mortgage Corporation.....................................                   0.95
Countrywide Home Loans, Inc. ........................................                   0.21
Cimarron Mortgage....................................................                   0.21
                                                                                     -------
    Total............................................................                 100.00%
                                                                                     -------
                                                                                     -------
</TABLE>
 
    Certain information with respect to the loan servicing experience of Norwest
Mortgage is set forth under "Delinquency and Foreclosure Experience."
 
    The Mortgage Loans  serviced by  Norwest Mortgage are  serviced either  from
Norwest Mortgage's servicing center located in Frederick, Maryland (the "Norwest
Frederick-Serviced  Loans")  or from  one  of several  other  regional servicing
centers (the "Norwest Non-Frederick-Serviced Loans"). As of the Cut-Off Date, it
is expected that  450 of the  Mortgage Loans in  the Trust Estate,  representing
approximately  28.04% of  the Cut-Off  Date Aggregate  Principal Balance  of the
Mortgage Loans will be
 
                                     S-104
<PAGE>
Norwest Frederick-Serviced Loans  and 539  of the  Mortgage Loans  in the  Trust
Estate,   representing  approximately  42.70%  of  the  Cut-Off  Date  Aggregate
Principal Balance of the Mortgage  Loans will be Norwest  Non-Frederick-Serviced
Loans.
 
SERVICER CUSTODIAL ACCOUNTS
 
    Each  Servicer is required to establish and maintain a custodial account for
principal and interest (each such account, a "Servicer Custodial Account"), into
which  it  will  deposit  all  collections  of  principal  (including  principal
prepayments  and Liquidation  Proceeds in respect  of principal, if  any) on any
Mortgage Loan that such Servicer services,  interest (net of Servicing Fees)  on
any  Mortgage  Loan that  such  Servicer services,  related  insurance proceeds,
advances made from the Servicer's own funds and the proceeds of any purchase  of
a  related Mortgage Loan for breach of  a representation or warranty or the sale
of a Mortgaged Property in connection  with liquidation of the related  Mortgage
Loan.  All Servicer Custodial Accounts  are required to be  held in a depository
institution and  invested in  the  manner specified  in the  related  Underlying
Servicing  Agreement. Funds in such accounts generally must be held separate and
apart from the assets of the Servicer  and generally may not be commingled  with
funds  held by a Servicer with respect to mortgage loans other than the Mortgage
Loans.
 
    Not later than the Remittance Date, the Servicers are obligated to remit  to
the  Certificate  Account  all  amounts on  deposit  in  the  Servicer Custodial
Accounts as  of  the  close  of  business on  the  business  day  preceding  the
Remittance Date other than the following:
 
        (a)   amounts  received  as  late  payments  of  principal  or  interest
    respecting which such Servicer previously has made one or more  unreimbursed
    Periodic Advances;
 
        (b)  any unreimbursed Periodic Advances of such Servicer with respect to
    Liquidated Loans;
 
        (c) those portions of each payment of interest on a particular  Mortgage
    Loan  which  represent  the  applicable  Servicing  Fee,  as  adjusted where
    applicable in respect of Month End Interest as described under  "Description
    of the Certificates -- Interest";
 
        (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)  unless the  applicable Underlying Servicing  Agreement provides for
    daily remittances  of Unscheduled  Principal  Receipts, as  described  below
    under  "--  Anticipated  Changes in  Servicing,"  all  Unscheduled Principal
    Receipts  received  by  such  Servicer  after  the  applicable   Unscheduled
    Principal  Receipt Period with  respect thereto specified  in the applicable
    Underlying Servicing Agreement, and all related payments of interest on such
    amounts;
 
        (f) all  amounts  representing  certain expenses  reimbursable  to  such
    Servicer  and any other amounts permitted to be retained by such Servicer or
    withdrawn by such Servicer from  the Servicer Custodial Account pursuant  to
    the applicable Underlying Servicing Agreement;
 
        (g)  all amounts in the nature of late fees, assumption fees, prepayment
    fees and  similar  fees  which  such  Servicer  is  entitled  to  retain  as
    additional servicing compensation; and
 
        (h)  reinvestment  earnings  on  payments  received  in  respect  of the
    Mortgage Loans  or on  other  amounts on  deposit  in the  related  Servicer
    Custodial Account.
 
UNSCHEDULED PRINCIPAL RECEIPTS
 
    The   Pooling  and  Servicing  Agreement  specifies,  as  to  each  type  of
Unscheduled Principal  Receipt,  a  period  (as  to  each  type  of  Unscheduled
Principal  Receipt, the "Unscheduled Principal Receipt Period") during which all
Unscheduled Principal Receipts  of such type  received by the  Servicer will  be
distributed  to  Certificateholders  on  the  related  Distribution  Date.  Each
Unscheduled Principal Receipt  Period will either  be (i) the  one month  period
ending on the last day of the calendar month
 
                                     S-105
<PAGE>
preceding  the month in which the applicable Remittance Date occurs (such period
a "Prior Month Receipt Period") or (ii)  the one month period ending on the  day
preceding  the Determination Date preceding the applicable Remittance Date (such
period a "Mid-Month Receipt Period").
 
    With respect  to  the  Norwest  Frederick-Serviced  Loans,  the  Unscheduled
Principal  Receipt Period  with respect  to all  types of  Unscheduled Principal
Receipts  is  a  Mid-Month   Receipt  Period.  With   respect  to  the   Norwest
Non-Frederick-Serviced Loans and Mortgage Loans serviced by Other Servicers, the
Unscheduled  Principal Receipt Period  with respect to  all types of Unscheduled
Principal Receipts is a Prior Month Receipt Period.
 
ANTICIPATED CHANGES IN SERVICING
 
    CHANGES IN TIMING OF REMITTANCES  OF UNSCHEDULED PRINCIPAL RECEIPTS IN  FULL
AND ELIMINATION OF MONTH END INTEREST.  The Pooling and Servicing Agreement will
provide  that the Master Servicer  may (but is not  required), from time to time
and without  the consent  of any  Certificateholder, the  Trustee or  the  Trust
Administrator, require Norwest Mortgage as Servicer under the related Underlying
Servicing  Agreement to, or enter into an amendment to any applicable Underlying
Servicing  Agreement  to  require  any  Other  Servicer  to,  remit  Unscheduled
Principal  Receipts  in  full  to  the  Master  Servicer  for  deposit  into the
Certificate Account daily on a specified business day following receipt  thereof
which  will  generally  result  in  a  deposit  earlier  than  on  the following
Remittance Date. In conjunction  with any such  change, the applicable  Servicer
would  be relieved  of its  obligation to remit  Month End  Interest and certain
other conforming changes may be made. Such  changes would have an effect on  the
amount   of  Compensating  Interest  as   described  herein  under  the  heading
"Description  of  the  Certificates  --  Interest."  Further,  the  Pooling  and
Servicing  Agreement  will provide  that  the Master  Servicer  may (but  is not
required to), without the consent of  any Certificateholder, the Trustee or  the
Trust Administrator, require Norwest Mortgage or any successor thereto under the
applicable Underlying Servicing Agreement to make remittances to the Certificate
Account  (other than any remittances which are required to be made daily) on the
18th day of  each month,  or if  such 18th day  is not  a business  day, on  the
preceding  business day. No assurance can be given  as to the timing of any such
changes or that any such changes will occur.
 
    CHANGES IN UNSCHEDULED PRINCIPAL RECEIPT PERIOD.  The Pooling and  Servicing
Agreement  will provide that the  Master Servicer may (but  is not required to),
from time to time and without the consent of any Certificateholder, the  Trustee
or  the Trust Administrator,  (i) direct Norwest Mortgage  as Servicer under the
related Underlying  Servicing  Agreement  to change  the  Unscheduled  Principal
Receipt  Period applicable to  any type of  Unscheduled Principal Receipt within
the parameters described in (i),  (ii) and (iii) below  or (ii) with respect  to
any  Other  Servicer,  enter  into an  amendment  to  any  applicable Underlying
Servicing Agreement  for  the  purpose of  changing  the  Unscheduled  Principal
Receipt  Period applicable to  any type of  Unscheduled Principal Receipt within
the parameters  described in  (iv)  below and  making any  necessary  conforming
changes incident thereto. In connection therewith, (i) the Unscheduled Principal
Receipt  Period for the Norwest Non-Frederick-Serviced  Loans may be changed (to
achieve consistency with  the Norwest Frederick-Serviced  Loans) to a  Mid-Month
Receipt Period with respect to all types of Unscheduled Principal Receipts; (ii)
the  Unscheduled Principal Receipt Period for the Norwest Non-Frederick-Serviced
Loans may be changed to achieve  an Unscheduled Principal Receipt Period  regime
(the  "Target Regime") under which the Unscheduled Principal Receipt Period with
respect to partial Unscheduled Principal Receipts would be a Prior Month Receipt
Period and the Unscheduled Principal Receipt Period with respect to  Unscheduled
Principal  Receipts  in full  would  be a  Mid-Month  Receipt Period;  (iii) the
Unscheduled Principal Receipt  Period for the  Norwest Frederick-Serviced  Loans
may  be changed to the Target Regime; and (iv) the Unscheduled Principal Receipt
Periods for the Mortgage Loans serviced by Other Servicers may be changed to the
Target Regime.
 
    Because Unscheduled Principal Receipts will result in interest shortfalls to
the extent that they are not  distributed to Certificateholders in the month  in
which  they are  received by  the applicable  Servicer, changing  the applicable
Unscheduled   Principal    Receipt    Period   from    a    Mid-Month    Receipt
 
                                     S-106
<PAGE>
Period  to a Prior  Month Receipt Period  may have the  effect of increasing the
amount of interest shortfalls with respect to the applicable type of Unscheduled
Principal Receipt.  Conversely, changing  the applicable  Unscheduled  Principal
Receipt  Period from a Prior Month Receipt  Period to a Mid-Month Receipt Period
may decrease the amount  of interest shortfalls with  respect to the  applicable
type  of Unscheduled Principal Receipt. See  "Description of the Certificates --
Interest." No assurance  can be  given as  to the timing  of any  change to  any
Unscheduled Principal Receipt Period or that any such changes will occur.
 
FIXED RETAINED YIELD; SERVICING COMPENSATION AND PAYMENT OF EXPENSES
 
    A  fixed  percentage  of the  interest  on  each Mortgage  Loan  (the "Fixed
Retained Yield") with a  per annum Mortgage Interest  Rate greater than (i)  the
sum  of (a) 7.75%, (b)  the Servicing Fee Rate and  (c) the Master Servicing Fee
Rate, which  will be  determined on  a loan  by loan  basis and  will equal  the
Mortgage  Interest Rate on each Mortgage Loan minus the rate described in clause
(i), will not be included in the  Trust Estate. There will be no Fixed  Retained
Yield  on any Mortgage Loan with a Mortgage  Interest Rate equal to or less than
the rate described in clause (i). See "Servicing of the Mortgage Loans --  Fixed
Retained   Yield,  Servicing  Compensation  and  Payment  of  Expenses"  in  the
Prospectus for further information regarding Fixed Retained Yield.
 
    The primary compensation payable to each  of the Servicers is the  aggregate
of  the Servicing Fees  applicable to the related  Mortgage Loans. The Servicing
Fee applicable to  each Mortgage Loan  is expressed as  a fixed percentage  (the
"Servicing  Fee Rate")  of the  scheduled principal  balance (as  defined in the
Underlying Servicing Agreements) of  such Mortgage Loan as  of the first day  of
each  month.  The Servicing  Fee Rate  for each  Mortgage Loan  will be  a fixed
percentage rate per  annum. The  Servicing Fee Rate  for each  Mortgage Loan  is
0.25%  per annum.  In addition  to the Servicing  Fees, late  payment fees, loan
assumption fees and prepayment fees with respect to the Mortgage Loans, and  any
interest  or other  income earned  on collections  with respect  to the Mortgage
Loans pending  remittance  to the  Certificate  Account,  will be  paid  to,  or
retained by, the Servicers as additional servicing compensation.
 
    The  Master Servicer  will pay all  routine expenses, including  fees of the
Trustee incurred in connection with  its responsibilities under the Pooling  and
Servicing  Agreement, subject to certain rights of reimbursement as described in
the Prospectus. The servicing fees and other expenses of the Trust Fund will  be
allocated   to  a  holders  of  the  Class  A-R  and  Class  A-LR  Certificates,
respectively who are individuals, estates or trusts (whether such Certificate is
held directly  or through  certain pass-through  entities) as  additional  gross
income  without a corresponding distribution of  cash, and any such investor (or
its owners, in the case of a pass-through entity) may be limited in its  ability
to  deduct such expenses for regular tax purposes  and may not be able to deduct
such expenses to  any extent for  alternative minimum tax  purposes. Unless  and
until  applicable authority provides otherwise, the  Seller intends to treat all
such expenses as incurred by the  Lower-Tier REMIC and, therefore, as  allocable
to  the holder of  the Class A-LR  Certificate. See "Certain  Federal Income Tax
Consequences --  Federal  Income  Tax Consequences  for  REMIC  Certificates  --
Limitations on Deduction of Certain Expenses" in the Prospectus.
 
SERVICER DEFAULTS
 
    The  Trustee  will  have  the right  pursuant  to  the  Underlying Servicing
Agreements to terminate a  Servicer in certain events,  including the breach  by
such  Servicer of any of its material obligations under its Underlying Servicing
Agreement. In the event of  such termination, (i) the  Trustee may enter into  a
substitute  Underlying Servicing Agreement  with the Master  Servicer or, at the
Master Servicer's nomination,  another servicing institution  acceptable to  the
Trustee  and  each Rating  Agency;  and (ii)  the  Master Servicer  shall assume
certain of the Servicer's servicing obligations under such Underlying  Servicing
Agreement,  including  the  obligation  to make  Periodic  Advances  (limited as
provided herein under the heading  "Pooling and Servicing Agreement --  Periodic
Advances"),  until such time as a successor servicer is appointed. Any successor
Servicer, including the Master Servicer
 
                                     S-107
<PAGE>
or the Trustee, will be entitled  to compensation arrangements similar to  those
provided to the Servicer. See "Servicing of the Mortgage Loans -- Fixed Retained
Yield, Servicing Compensation and Payment of Expenses" in the Prospectus.
 
                       FEDERAL INCOME TAX CONSIDERATIONS
 
    The  following discussion represents the opinion of Cadwalader, Wickersham &
Taft as  to the  anticipated material  federal income  tax consequences  of  the
purchase, ownership and disposition of the Offered Certificates.
 
    The  Trust Estate  will consist of  two segregated asset  groupings, each of
which will qualify as a  REMIC for federal income  tax purposes. One REMIC  (the
"Lower-Tier  REMIC")  will  issue  certain  uncertificated  interests  (each,  a
"Lower-Tier REMIC Regular  Interest"), each  of which  will be  designated as  a
regular  interest in the Lower-Tier REMIC, and the Class A-LR Certificate, which
will be designated as the residual interest in the Lower-Tier REMIC. The  assets
of  the  Lower-Tier REMIC  will include  the Mortgage  Loans, together  with the
amounts held by the Master Servicer  in a separate account in which  collections
on  the Mortgage Loans will be deposited (the "Certificate Account"), the hazard
insurance policies and primary mortgage insurance policies, if any, relating  to
the  Mortgage  Loans and  any  property that  secured  a Mortgage  Loan  that is
acquired by foreclosure or deed in lieu of foreclosure.
 
    The second REMIC (the "Upper-Tier REMIC")  will issue all Subclasses of  the
Class  A  Certificates (other  than  the Class  A-LR  Certificate), the  Class M
Certificates and all  Subclasses of  the Class  B Certificates.  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-13, Class A-14, Class A-15 and  Class
A-16  Certificates, the  Class M  Certificates and the  Class B-1  and Class B-2
Certificates (collectively, the "Regular Certificates"), together with the Class
A-12 TAC Accrual Component, the Class A-12  IO A Component, the Class A-12 IO  B
Component,  the Class A-12 IO  C Component, the Class  A-12 PO Component and the
Class B-3, Class B-4, and Class B-5 Certificates, will be designated as  regular
interests  in  the  Upper-Tier REMIC,  and  the  Class A-R  Certificate  will be
designated as  the  residual  interest  in the  Upper-Tier  REMIC.  The  regular
interests  and the  residual interest  in the  Upper-Tier REMIC  are referred to
herein collectively as the  "Upper-Tier Certificates." The  Class A-R and  Class
A-LR  Certificates are "Residual  Certificates" for purposes  of the Prospectus.
The assets of the  Upper-Tier REMIC will  include the uncertificated  Lower-Tier
REMIC  Regular Interests  and a separate  account in which  distributions on the
uncertificated  Lower-Tier  REMIC  Regular  Interests  will  be  deposited.  The
aggregate  amount  distributed to  the holders  of the  Upper-Tier Certificates,
payable from such separate account, will be equal to the aggregate distributions
in respect of the Mortgage Loans on the uncertificated Lower-Tier REMIC  Regular
Interests.
 
    The Offered Certificates will be treated as "qualifying real property loans"
for  mutual savings banks and domestic  building and loan associations, "regular
or residual interests in a REMIC"  for domestic building and loan  associations,
and  "real  estate assets"  for  real estate  investment  trusts, to  the extent
described in the Prospectus.
 
REGULAR CERTIFICATES
 
    The Regular Certificates generally will be treated as newly originated  debt
instruments  for federal income tax purposes.  Beneficial Owners (or in the case
of Definitive  Certificates,  holders)  of  the  Regular  Certificates  will  be
required  to report income  on such Certificates in  accordance with the accrual
method of accounting.
 
    It is anticipated that  the Class A-11 and  Class B-2, Certificates will  be
issued  with original  issue discount in  an amount  equal to the  excess of the
initial principal balances of such Subclasses (plus two days of interest at  the
pass-through  rates  thereon)  over  their  respective  issue  prices (including
accrued interest). It  is further  anticipated that  the Class  A-1, Class  A-2,
Class  A-3, Class A-4, Class  A-6, Class A-7, Class  A-8, Class A-9, Class A-10,
Class A-14, Class A-15, Class A-16 and Class M
 
                                     S-108
<PAGE>
Certificates will be issued at a premium and that the Class A-5, Class A-13  and
Class  B-1 Certificates will  be issued with DE  MINIMIS original issue discount
for federal income tax purposes. The Class A-12, Class B-3, Class B-4 and  Class
B-5  Certificates, which are not offered hereby,  also will be treated as issued
with original issue discount for federal income tax purposes.
 
    The Prepayment Assumption  (as defined  in the Prospectus)  that the  Master
Servicer  intends to use  in determining the  rate of accrual  of original issue
discount will be calculated using 235% SPA. No representation is made as to  the
actual rate at which the Mortgage Loans will prepay.
 
RESIDUAL CERTIFICATES
 
    The  holders of the Class  A-R and Class A-LR  Certificates must include the
taxable  income  or  loss  of   the  Upper-Tier  REMIC  and  Lower-Tier   REMIC,
respectively,  in determining  their federal taxable  income. The  Class A-R and
Class A-LR Certificates will remain outstanding for federal income tax  purposes
until  there are  no Certificates  of any  other Class  outstanding. PROSPECTIVE
INVESTORS ARE CAUTIONED THAT  THE CLASS A-R  AND CLASS A-LR  CERTIFICATEHOLDERS'
REMIC  TAXABLE  INCOME  AND  THE  TAX  LIABILITY  THEREON  MAY  EXCEED,  AND MAY
SUBSTANTIALLY EXCEED, CASH DISTRIBUTIONS TO SUCH HOLDERS DURING CERTAIN PERIODS,
IN WHICH EVENT, THE HOLDER THEREOF  MUST HAVE SUFFICIENT ALTERNATIVE SOURCES  OF
FUNDS  TO PAY SUCH TAX  LIABILITY. Furthermore, it is  anticipated that all or a
substantial portion of the taxable income of the Upper-Tier REMIC and Lower-Tier
REMIC includible by the  holders of the Class  A-R and Class A-LR  Certificates,
respectively, will be treated as "excess inclusion" income, resulting in (i) the
inability of such holders to use net operating losses to offset such income from
the  respective REMIC, (ii) the treatment  of such income as "unrelated business
taxable income" to certain holders who  are otherwise tax-exempt, and (iii)  the
treatment  of such income as subject to  30% withholding tax to certain non-U.S.
investors, with no exemption or treaty reduction.
 
    Under the REMIC Regulations, because the fair market value of the Class  A-R
and  Class A-LR Certificates will not exceed 2%  of the fair market value of the
respective REMIC,  the Class  A-R  and Class  A-LR  Certificates will  not  have
"significant  value," and  thrift institutions will  not be  permitted to offset
their net operating losses  against such excess  inclusion income. In  addition,
the  Class  A-R  and Class  A-LR  Certificates will  be  considered "noneconomic
residual interests," with the result that transfers thereof would be disregarded
for federal income tax purposes if any significant purpose of the transferor was
to impede  the assessment  or  collection of  tax. Accordingly,  the  transferee
affidavit  used for transfer of  the Class A-R and  Class A-LR Certificates will
require the transferee to affirm that it (i) historically has paid its debts  as
they  have come due and intends to do so in the future, (ii) understands that it
may incur  tax  liabilities  with  respect  to  the  Class  A-R  or  Class  A-LR
Certificate  in excess  of cash  flows generated  thereby, (iii)  intends to pay
taxes associated with holding  the Class A-R or  Class A-LR Certificate as  such
taxes  become  due  and (iv)  will  not transfer  the  Class A-R  or  Class A-LR
Certificate to any person or entity  that does not provide a similar  affidavit.
The  transferor must certify in  writing to the Trust  Administrator that, as of
the date  of the  transfer, it  had  no knowledge  or reason  to know  that  the
affirmations  made by  the transferee  pursuant to  the preceding  sentence were
false. Additionally, the Class A-R and Class A-LR Certificates generally may not
be transferred to certain persons who are not U.S. Persons (as defined  herein).
See  "Description of the  Certificates -- Restrictions on  Transfer of the Class
A-R, Class A-LR, Class M and  Offered Class B Certificates" herein and  "Certain
Federal  Income Tax  Consequences -- Federal  Income Tax  Consequences For REMIC
Certificates," "-- Taxation of Residual Certificates -- Limitations on Offset or
Exemption of  REMIC Income"  and  "-- Tax-Related  Restrictions on  Transfer  of
Residual Certificates -- Noneconomic Residual Interests" in the Prospectus.
 
    An  individual,  trust or  estate that  holds  the Class  A-R or  Class A-LR
Certificate (whether such  Certificate is  held directly  or indirectly  through
certain  pass-through  entities)  also  may have  additional  gross  income with
respect to, but may be subject to limitations on the deductibility of, Servicing
Fees on the Mortgage Loans and other administrative expenses properly  allocable
to  the applicable REMIC  in computing such holder's  regular tax liability, and
may not be able to deduct such fees or expenses to any extent in computing  such
holder's alternative minimum tax liability. In addition,
 
                                     S-109
<PAGE>
some  portion of  a purchaser's basis,  if any, in  the Class A-R  or Class A-LR
Certificate may  not be  recovered until  termination of  the respective  REMIC.
Furthermore,  the federal income tax consequences of any consideration paid to a
transferee on a transfer of the Class A-R or Class A-LR Certificate are unclear.
The preamble  to  the REMIC  Regulations  indicates that  the  Internal  Revenue
Service anticipates providing guidance with respect to the federal tax treatment
of  such consideration. Any  transferee receiving consideration  with respect to
the Class A-R and Class A-LR Certificates should consult its tax advisors.
 
    DUE TO  THE  SPECIAL TAX  TREATMENT  OF RESIDUAL  INTERESTS,  THE  EFFECTIVE
AFTER-TAX   RETURN  OF  THE  CLASS  A-R  AND  CLASS  A-LR  CERTIFICATES  MAY  BE
SIGNIFICANTLY LOWER THAN  WOULD BE  THE CASE  IF THE  CLASS A-R  AND CLASS  A-LR
CERTIFICATES WERE TAXED AS DEBT INSTRUMENTS, OR MAY BE NEGATIVE.
 
    See "Certain Federal Income Tax Consequences" in the Prospectus.
 
                              ERISA CONSIDERATIONS
 
    Neither  the Class  A-R Certificate  nor the  Class A-LR  Certificate may be
purchased by or  transferred to  any person which  is an  employee benefit  plan
within  the meaning of  Section 3(3) of the  Employee Retirement Income Security
Act of  1974,  as amended  ("ERISA"),  and which  is  subject to  the  fiduciary
responsibility  rules  of Sections  401-414 of  ERISA or  Code Section  4975 (an
"ERISA Plan") or which is  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, with an ERISA Plan, a "Plan"), or any person utilizing the assets
of such Plan. Accordingly, the following discussion does not purport to  discuss
the considerations under ERISA, Code Section 4975 or Similar Law with respect to
the  purchase, acquisition or resale of the  Class A-R or Class A-LR Certificate
and for  purposes of  the following  discussion all  references to  the  Offered
Certificates are deemed to exclude the Class A-R and Class A-LR Certificates.
 
    In  addition, under current law  the purchase and holding  of the Class M or
Offered Class B Certificates by or on behalf of a Plan may result in "prohibited
transactions" within the meaning of ERISA and Code Section 4975 or Similar  Law.
Transfer  of the Class M or Offered Class B Certificates will not be made unless
the transferee  (i)  executes a  representation  letter in  form  and  substance
satisfactory  to the Trustee  stating that (a) it  is not, and  is not acting on
behalf of, any such  Plan or using the  assets of any such  Plan to effect  such
purchase  or (b) if it is an insurance company, that the source of funds used to
purchase the Class M  or Offered Class B  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 (ii) provides an opinion  of counsel in form  and
substance  satisfactory to the Trustee that the purchase or holding of the Class
M or Offered Class B Certificates by or  on behalf of such Plan 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 and  the Code or Similar  Law
and  will not  subject the  Seller, the  Master Servicer  or the  Trustee to any
obligation in  addition  to  those  undertaken  in  the  Pooling  and  Servicing
Agreement.  The Class M and  Offered Class B Certificates  will contain a legend
describing such restrictions on transfer and the Pooling and Servicing Agreement
will provide that  any attempted  or purported  transfer in  violation of  these
transfer  restrictions will  be null  and void  and will  vest no  rights in any
purported transferee. Accordingly, the following discussion does not purport  to
discuss  the considerations under  ERISA, Code Section 4975  or Similar Law with
respect to the purchase, acquisition or resale of the Class M or Offered Class B
Certificates and for purposes of the following discussion all references to  the
Offered  Certificates are  deemed to  exclude the  Class M  and Offered  Class B
Certificates.
 
                                     S-110
<PAGE>
    As described in the Prospectus  under "ERISA Considerations," ERISA and  the
Code  impose certain duties and restrictions  on ERISA Plans and certain persons
who perform services  for ERISA  Plans. Comparable duties  and restrictions  may
exist  under Similar Law  on governmental plans and  certain persons who perform
services for governmental plans. For example, unless exempted, investment by  an
ERISA  Plan in the Offered Certificates  may constitute a prohibited transaction
under ERISA, the Code or Similar Law. There are certain exemptions issued by the
United States  Department of  Labor (the  "DOL") that  may be  applicable to  an
investment  by  an  ERISA  Plan  in  the  Offered  Certificates,  including  the
individual administrative exemption described  below and Prohibited  Transaction
Class  Exemption 83-1 ("PTE  83-1"). For a further  discussion of the individual
administrative exemption and  PTE 83-1,  including the  necessary conditions  to
their  applicability, and other  important factors to be  considered by an ERISA
Plan  contemplating   investing  in   the  Offered   Certificates,  see   "ERISA
Considerations" in the Prospectus.
 
    On  December  5,  1990, the  DOL  issued  to the  Underwriter  an individual
administrative exemption, Prohibited Transaction  Exemption 90-83, 55 Fed.  Reg.
50250  (the "Exemption"),  from certain of  the prohibited  transaction rules of
ERISA with  respect to  the initial  purchase, the  holding and  the  subsequent
resale  by an ERISA  Plan of certificates  in pass-through trusts  that meet the
conditions and requirements of the Exemption.  The Exemption might apply to  the
acquisition,  holding and resale  of the Offered Certificates  by an ERISA Plan,
provided that specified conditions are met.
 
    Among the conditions which would have  to be satisfied for the Exemption  to
apply  to the acquisition  by an ERISA  Plan of the  Offered Certificates is the
condition that  the ERISA  Plan  investing in  the  Offered Certificates  be  an
"accredited  investor"  as defined  in  Rule 501(a)(1)  of  Regulation D  of the
Securities and Exchange Commission under the Securities Act of 1933, as  amended
(the "Securities Act").
 
    Before  purchasing  an Offered  Certificate, a  fiduciary  of an  ERISA Plan
should make its own determination as to the availability of the exemptive relief
provided  in  the  Exemption  or  the  availability  of  any  other   prohibited
transaction  exemptions (including PTE 83-1), and  whether the conditions of any
such exemption will be applicable to the Offered Certificates and a fiduciary of
a governmental plan should  make its own  determination as to  the need for  and
availability  of any  exemptive relief  under Similar  Law. Any  fiduciary of an
ERISA Plan considering whether  to purchase an  Offered Certificate should  also
carefully  review with its own legal advisors the applicability of the fiduciary
duty and prohibited transaction provisions of ERISA, the Code and Similar Law to
such investment. See "ERISA Considerations" in the Prospectus.
 
                                LEGAL INVESTMENT
 
    The  Class  A  and  Class   M  Certificates  constitute  "mortgage   related
securities"  for purposes  of the Secondary  Mortgage Market  Enhancement Act of
1984 (the "Enhancement Act") so long as they are rated in one of the two highest
rating categories  by  at least  one  nationally recognized  statistical  rating
organization.  As  such,  the  Class  A  and  Class  M  Certificates  are  legal
investments for certain entities to the extent provided in the Enhancement  Act.
However,  institutions  subject  to  the  jurisdiction  of  the  Office  of  the
Comptroller of  the Currency,  the Board  of Governors  of the  Federal  Reserve
System,  the  Federal  Deposit  Insurance  Corporation,  the  Office  of  Thrift
Supervision, the  National  Credit  Union Administration  or  state  banking  or
insurance  authorities should review applicable  rules, supervisory policies and
guidelines of these agencies before  purchasing any of the  Class A and Class  M
Certificates,  as certain Subclasses of the Class  A Certificates or the Class M
Certificates may be  deemed to be  unsuitable investments under  one or more  of
these  rules, policies and guidelines and whether certain restrictions may apply
to investments in other Subclasses  of the Class A  Certificates or the Class  M
Certificates. It should also be noted that certain states recently have enacted,
or  have proposed enacting, legislation limiting  to varying extents the ability
of certain entities (in  particular insurance companies)  to invest in  mortgage
related  securities. Investors should  consult with their  own legal advisors in
determining whether  and  to  what  extent Class  A  and  Class  M  Certificates
constitute  legal investments for such investors.  See "Legal Investment" in the
Prospectus.
 
                                     S-111
<PAGE>
    The Class  B-1 and  Class  B-2 Certificates  will not  constitute  "mortgage
related  securities" under the Enhancement Act. The appropriate characterization
of the  Class B-1  and Class  B-2 Certificates  under various  legal  investment
restrictions, and thus the ability of investors subject to these restrictions to
purchase the Class B-1 and Class B-2 Certificates, may be subject to significant
interpretative  uncertainties.  All  investors  whose  investment  authority  is
subject to  legal  restrictions  should  consult their  own  legal  advisors  to
determine  whether, and to what extent, the Class B-1 and Class B-2 Certificates
will constitute  legal  investments for  them.  See "Legal  Investment"  in  the
Prospectus.
 
                                SECONDARY MARKET
 
    There  will not  be any  market for  the Offered  Certificates prior  to the
issuance thereof.  The Underwriter  intends to  act  as a  market maker  in  the
Offered  Certificates,  subject to  applicable provisions  of federal  and state
securities laws and other regulatory requirements, but is under no obligation to
do so.  There  can be  no  assurance that  a  secondary market  in  the  Offered
Certificates  will  develop or,  if such  a  market does  develop, that  it will
provide holders  of Offered  Certificates with  liquidity of  investment at  any
particular  time or  for the life  of the  Offered Certificates. As  a source of
information concerning  the Certificates  and  the Mortgage  Loans,  prospective
investors  in Certificates may obtain copies  of the reports included in monthly
statements   to    Certificateholders    described   under    "Description    of
Certificates  -- Reports" upon  written request to the  Trustee at the Corporate
Trust Office.
 
                                  UNDERWRITING
 
    Subject to the terms and conditions of the underwriting agreement dated July
12,  1996  and  the  terms  agreement   dated  July  25,  1996  (together,   the
"Underwriting  Agreement")  among Norwest  Mortgage,  the Seller  and Donaldson,
Lufkin & Jenrette  Securities Corporation, as  underwriter (the  "Underwriter"),
the  Offered Certificates offered hereby are  being purchased from the Seller by
the Underwriter upon issuance. The Underwriter  is committed to purchase all  of
the  Offered  Certificates  if  any  Offered  Certificates  are  purchased.  The
Underwriter has  advised  the Seller  that  it  proposes to  offer  the  Offered
Certificates,  from  time  to  time,  for  sale  in  negotiated  transactions or
otherwise at prices determined at the time of sale. Proceeds to the Seller  from
the  sale  of  the Offered  Certificates  will  be approximately  98.75%  of the
aggregate initial principal balance of the Class A Certificates (other than  the
Class   A-12  Certificates),  approximately  97.56%  of  the  aggregate  initial
prinicpal balance  of the  Class  M Certificates,  approximately 96.21%  of  the
aggregate   initial  principal  balance  of   the  Class  B-1  Certificates  and
approximately 92.34% of the aggregate initial principal balance of the Class B-2
Certificates, plus, in each case, accrued interest thereon at the rate of  7.75%
per  annum from August  1, 1996 to  (but not including)  August 27, 1996, before
deducting expenses  payable by  the Seller.  The Underwriter,  which is  not  an
affiliate  of the Seller,  has advised the  Seller that the  Underwriter has not
allocated the purchase  price paid to  the Seller for  the Class A  Certificates
offered  hereby among such  Subclasses of Class  A Certificates. The Underwriter
and any dealers that participate with the Underwriter in the distribution of the
Offered Certificates may  be deemed  to be  underwriters, and  any discounts  or
commissions   received  by  them  and  any  profit  on  the  resale  of  Offered
Certificates by them may be deemed to be underwriting discounts or  commissions,
under the Securities Act.
 
    The Underwriting Agreement provides that the Seller or Norwest Mortgage will
indemnify the Underwriter against certain civil liabilities under the Securities
Act  or contribute to payments which the  Underwriter may be required to make in
respect thereof.
 
                                 LEGAL MATTERS
 
    The validity  of  the Offered  Certificates  and certain  tax  matters  with
respect  thereto will be passed upon for  the Seller by Cadwalader, Wickersham &
Taft, New York,  New York. Certain  legal matters  will be passed  upon for  the
Underwriters by Brown & Wood LLP, New York, New York.
 
                                     S-112
<PAGE>
                                USE OF PROCEEDS
 
    The  net proceeds to be  received from the sale  of the Offered Certificates
will be applied  by the  Seller to  the purchase  from Norwest  Mortgage of  the
Mortgage Loans underlying the Series 1996-4 Certificates.
 
                                    RATINGS
 
    It  is a condition  to the issuance  of the Class  A Certificates offered by
this Prospectus Supplement  and the Prospectus  that they will  have been  rated
"AAA"  by  Fitch and  S&P. It  is a  condition to  the issuance  of the  Class M
Certificates that they will have been rated  at least "AA" by Fitch and S&P.  It
is  a condition to the issuance of the Class B-1 and Class B-2 Certificates that
they will have  been rated  "A" and "BBB,"  respectively, by  Fitch. A  security
rating  is  not a  recommendation to  buy, sell  or hold  securities and  may be
subject to revision or  withdrawal at any time  by the assigning rating  agency.
Each  security rating  should be evaluated  independently of  any other security
rating.
 
    The ratings  of  S&P  on  mortgage  pass-through  certificates  address  the
likelihood  of the receipt by certificateholders  of timely payments of interest
and the ultimate return of principal. S&P's ratings take into consideration  the
credit  quality of  the mortgage pool,  including any  credit support providers,
structural and legal aspects associated with the certificates, and the extent to
which the  payment stream  on the  mortgage pool  is adequate  to make  payments
required  under the  certificates. S&P's  ratings on  such certificates  do not,
however, constitute  a  statement  regarding frequency  of  prepayments  on  the
mortgage loans. S&P's rating does not address the possibility that investors may
suffer  a  lower  than anticipated  yield  as  a result  of  prepayments  of the
underlying mortgages. In addition, it should be noted that in some structures  a
default on a mortgage is treated as a prepayment and may have the same effect on
yield as a prepayment.
 
    The  ratings  of Fitch  on  mortgage pass-through  certificates  address the
likelihood of the receipt  by certificateholders of  all distributions to  which
such  certificateholders  are  entitled.  Fitch's  rating  opinions  address the
structural and legal  aspects associated  with the  certificates, including  the
nature  of  the  underlying  mortgage  loans.  Fitch's  ratings  on pass-through
certificates do  not represent  any  assessment of  the  likelihood or  rate  of
principal  prepayments and  consequently any adverse  effect the  timing of such
prepayments could have on an investor's anticipated yield.
 
    The Seller has  not requested a  rating on the  Offered Certificates of  any
Subclass  or Class by any rating agency  other than Fitch and S&P, although data
with respect  to the  Mortgage Loans  may  have been  provided to  other  rating
agencies solely for their informational purposes. There can be no assurance that
any  rating assigned by any other rating agency to the Offered Certificates will
be as high as those assigned by Fitch and S&P.
 
                                     S-113
<PAGE>
                              INDEX OF SIGNIFICANT
                       PROSPECTUS SUPPLEMENT DEFINITIONS
 
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Accretion Directed Certificates..........................................................................  S-2
Accretion Termination Dates..............................................................................  S-44
Accrual Certificates.....................................................................................  S-2
Adjusted Pool Amount.....................................................................................  S-42
Adjusted Pool Amount (PO Portion)........................................................................  S-42
Adjustment Amount........................................................................................  S-68
Aggregate Current Bankruptcy Losses......................................................................  S-69
Aggregate Current Fraud Losses...........................................................................  S-69
Aggregate Current Special Hazard Losses..................................................................  S-68
Available Master Servicing Compensation..................................................................  S-42
Bankruptcy Loss..........................................................................................  S-48
Bankruptcy Loss Amount...................................................................................  S-69
Beneficial Owner.........................................................................................  S-34
Book-Entry Certificates..................................................................................  S-4
Bulk Purchase Underwritten Loans.........................................................................  S-16
Cede.....................................................................................................  S-34
Certificate Account......................................................................................  S-108
Certificateholder........................................................................................  S-4
Certificates.............................................................................................  S-8
Class A Certificates.....................................................................................  Cover
Class A Non-PO Distribution Amount.......................................................................  S-38
Class A Non-PO Optimal Amount............................................................................  S-45
Class A Non-PO Optimal Principal Amount..................................................................  S-47
Class A Non-PO Principal Balance.........................................................................  S-41
Class A Optional Amount..................................................................................  S-45
Class A Percentage.......................................................................................  S-21
Class A Prepayment Percentage............................................................................  S-21
Class A Subclass Interest Accrual Amount.................................................................  S-38
Class A Subclass Interest Shortfall Amount...............................................................  S-45
Class A Subclass Principal Balance.......................................................................  S-40
Class A Voting Interest..................................................................................  S-102
Class A-11 Accretion Termination Date....................................................................  S-44
Class A-11 Accrual Distribution Amount...................................................................  S-47
Class A-12 Component.....................................................................................  S-2
Class A-12 IO A Component................................................................................  S-2
Class A-12 IO B Component................................................................................  S-2
Class A-12 IO C Component................................................................................  S-2
Class A-12 PO Component Deferred Amount..................................................................  S-50
Class A-12 PO Component Distribution Amount..............................................................  S-50
Class A-12 PO Component Optimal Principal Amount.........................................................  S-50
Class A-12 PO Component..................................................................................  S-2
Class A-12 TAC Accrual Component Accretion Termination Date..............................................  S-44
Class A-12 TAC Accrual Component Distribution Amount.....................................................  S-47
Class A-12 TAC Accrual Component.........................................................................  S-2
Class A-5 Percentage.....................................................................................  S-56
Class A-5 Prepayment Shift Percentage....................................................................  S-56
Class A-5 Priority Amount................................................................................  S-56
Class B Certificates.....................................................................................  Cover
Class B Principal Balance................................................................................  S-41
</TABLE>
 
                                     S-114
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Class B Subclass Distribution Amount.....................................................................  S-38
Class B Subclass Interest Accrual Amount.................................................................  S-40
Class B Subclass Interest Shortfall Amount...............................................................  S-46
Class B Subclass Principal Balance.......................................................................  S-41
Class B Voting Interest..................................................................................  S-102
Class B-1 Principal Distribution Amount..................................................................  S-51
Class B-2 Principal Distribution Amount..................................................................  S-51
Class M Certificates.....................................................................................  Cover
Class M Distribution Amount..............................................................................  S-38
Class M Interest Accrual Amount..........................................................................  S-40
Class M Interest Shortfall Amount........................................................................  S-45
Class M Optimal Amount...................................................................................  S-46
Class M Optimal Principal Amount.........................................................................  S-51
Class M Percentage.......................................................................................  S-52
Class M Prepayment Percentage............................................................................  S-52
Class M Principal Balance................................................................................  S-41
Class M Principal Distribution Amount....................................................................  S-51
Closing Date.............................................................................................  S-15
Code.....................................................................................................  S-31
Companion Certificate....................................................................................  S-13
Compensating Interest....................................................................................  S-19
Component................................................................................................  S-2
Component Interest Accrual Amount........................................................................  S-38
Component Interest Shortfall Amount......................................................................  S-45
Component Principal Balance..............................................................................  S-40
Component Rate...........................................................................................  S-18
Cooperatives.............................................................................................  S-71
Co-op Shares.............................................................................................  S-71
Cross-Over Date..........................................................................................  S-66
Current Class B-1 Fractional Interest....................................................................  S-54
Current Class B-2 Fractional Interest....................................................................  S-54
Current Class B-3 Fractional Interest....................................................................  S-54
Current Class B-4 Fractional Interest....................................................................  S-54
Current Class M Fractional Interest......................................................................  S-53
Curtailment Interest Shortfalls..........................................................................  S-43
Cut-Off Date Aggregate Principal Balance.................................................................  S-71
Debt Service Reduction...................................................................................  S-48
Deficient Valuation......................................................................................  S-48
Definitive Certificates..................................................................................  S-13
Determination Date.......................................................................................  S-34
Discount Mortgage Loans..................................................................................  S-11
Disqualified Organizations...............................................................................  S-4
Distribution Date........................................................................................  S-2
DOL......................................................................................................  S-111
DTC......................................................................................................  S-14
Enhancement Act..........................................................................................  S-31
ERISA....................................................................................................  S-31
ERISA Plan...............................................................................................  S-110
Excess Bankruptcy Loss...................................................................................  S-69
Excess Bankruptcy Losses.................................................................................  S-69
Excess Fraud Loss........................................................................................  S-69
</TABLE>
 
                                     S-115
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Excess Fraud Losses......................................................................................  S-69
Excess Principal Payment.................................................................................  S-62
Excess Special Hazard Loss...............................................................................  S-68
Excess Special Hazard Losses.............................................................................  S-68
Exemption................................................................................................  S-111
Fitch....................................................................................................  S-9
Fixed Non-relocation PHMC Portfolio Loans................................................................  S-80
Fixed PHMC Portfolio Loans...............................................................................  S-80
Fixed Retained Yield.....................................................................................  S-107
Fraud Loss...............................................................................................  S-48
Fraud Loss Amount........................................................................................  S-69
Liquidated Loan..........................................................................................  S-48
Liquidated Loan Loss.....................................................................................  S-48
Loss Severity Percentage.................................................................................  S-99
Lower-Tier REMIC.........................................................................................  S-4
Lower-Tier REMIC Regular Interest........................................................................  S-108
Master Servicer..........................................................................................  S-2
Master Servicing Fee.....................................................................................  S-103
Master Servicing Fee Rate................................................................................  S-103
Mid-Month Receipt Period.................................................................................  S-106
Month End Interest.......................................................................................  S-42
Mortgage Loans...........................................................................................  S-2
Mortgaged Properties.....................................................................................  S-71
Mortgages................................................................................................  S-71
NASCOR...................................................................................................  Cover
Net Foreclosure Profits..................................................................................  S-63
Net Mortgage Interest Rate...............................................................................  S-42
Net Partial Liquidation Proceeds.........................................................................  S-36
NMI Portfolio Loans......................................................................................  S-80
Non-PO Fraction..........................................................................................  S-21
Non-PO Voting Interest...................................................................................  S-102
Non-Supported Interest Shortfalls........................................................................  S-19
Norwest Bank.............................................................................................  S-2
Norwest Correspondent....................................................................................  S-72
Norwest Frederick-Serviced Loans.........................................................................  S-104
Norwest Mortgage.........................................................................................  S-2
Norwest Mortgage Correspondent...........................................................................  S-2
Norwest Non-Frederick-Serviced Loans.....................................................................  S-104
Offered Certificates.....................................................................................  Cover
Offered Class B Certificates.............................................................................  Cover
Original Class B-1 Fractional Interest...................................................................  S-54
Original Class B-2 Fractional Interest...................................................................  S-54
Original Class B-3 Fractional Interest...................................................................  S-54
Original Class B-4 Fractional Interest...................................................................  S-54
Original Class M Fractional Interest.....................................................................  S-53
Original Subordinated Principal Balance..................................................................  S-49
Other Originator.........................................................................................  S-79
Other Originators........................................................................................  S-79
Other Servicers..........................................................................................  S-104
Partial Liquidation Proceeds.............................................................................  S-36
Pass-Through Rate........................................................................................  S-18
</TABLE>
 
                                     S-116
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Percentage Interest......................................................................................  S-38
Periodic Advance.........................................................................................  S-64
PHMC.....................................................................................................  S-2
PHMC Acquisition.........................................................................................  S-15
PHMC Correspondent.......................................................................................  S-8
PHMC Portfolio Loans.....................................................................................  S-80
Plan.....................................................................................................  S-31
PO Fraction..............................................................................................  S-22
Pool Balance (Non-PO Portion)............................................................................  S-11
Pool Balance (PO Portion)................................................................................  S-11
Pool Certification Underwritten Loans....................................................................  S-16
Pool Distribution Amount.................................................................................  S-35
Pool Distribution Amount Allocation......................................................................  S-35
Pooling and Servicing Agreement..........................................................................  S-102
Premium Mortgage Loans...................................................................................  S-72
Prepayments in Full......................................................................................  S-42
Prepayment Interest Shortfalls...........................................................................  S-42
Prior Month Receipt Period...............................................................................  S-106
Prospectus...............................................................................................  S-8
PTE 83-1.................................................................................................  S-111
PTE 96-60................................................................................................  S-110
Realized Loss............................................................................................  S-48
Record Date..............................................................................................  S-34
Regular Certificates.....................................................................................  S-108
Relocation Mortgage Loans................................................................................  S-80
REMIC....................................................................................................  S-4
Remittance Date..........................................................................................  S-36
REO Property.............................................................................................  S-104
Residual Certificate.....................................................................................  S-108
S&P......................................................................................................  S-9
Scheduled Principal Amount...............................................................................  S-56
Scheduled Principal Balance..............................................................................  S-48
SDA......................................................................................................  S-99
Securities Act...........................................................................................  S-111
Seller...................................................................................................  S-2
Senior Certificates......................................................................................  S-9
Series 1996-4 Certificates...............................................................................  Cover
Servicer.................................................................................................  S-2
Servicers................................................................................................  S-104
Servicer Custodial Account...............................................................................  S-105
Servicing Fee Rate.......................................................................................  S-107
Similar Law..............................................................................................  S-31
SPA......................................................................................................  S-90
Special Hazard Loss......................................................................................  S-48
Special Hazard Loss Amount...............................................................................  S-68
Subclass.................................................................................................  Cover
Subclass B Optimal Amount................................................................................  S-46
Subclass B Optimal Principal Amount......................................................................  S-51
Subclass B Percentage....................................................................................  S-52
Subclass B Prepayment Percentage.........................................................................  S-52
Subordinated Certificates................................................................................  Cover
</TABLE>
 
                                     S-117
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Subordinated Percentage..................................................................................  S-50
Subordinated Prepayment Percentage.......................................................................  S-50
TAC Certificates.........................................................................................  Cover
TAC Principal Amount.....................................................................................  S-57
Target Regime............................................................................................  S-106
Trust Estate.............................................................................................  S-2
Trustee..................................................................................................  S-9
U.S. Person..............................................................................................  S-64
Underlying Servicing Agreement...........................................................................  S-8
Underwriter..............................................................................................  Cover
Underwriting Agreement...................................................................................  S-112
Underwriting Standards...................................................................................  S-72
Unscheduled Principal Amount.............................................................................  S-56
Unscheduled Principal Receipt Period.....................................................................  S-105
Unscheduled Principal Receipts...........................................................................  S-35
Upper-Tier Certificates..................................................................................  S-108
Upper-Tier REMIC.........................................................................................  S-4
30 Year Mortgage Loans...................................................................................  S-98
</TABLE>
 
                                     S-118
<PAGE>
                 (This page has been left blank intentionally.)
 
                                     S-119
<PAGE>
                      NORWEST ASSET SECURITIES CORPORATION
                                   ("NASCOR")
 
                                     SELLER
 
                       MORTGAGE PASS-THROUGH CERTIFICATES
                              (ISSUABLE IN SERIES)
                             ---------------------
 
    Norwest  Asset Securities  Corporation (the  "Seller" or  "NASCOR") may sell
from time to time, under this Prospectus and applicable Prospectus  Supplements,
Mortgage  Pass-Through  Certificates  (the "Certificates"),  issuable  in series
(each, a  "Series") consisting  of one  or  more classes  (each, a  "Class")  of
Certificates.  Any  Class  of  Certificates  may be  divided  into  two  or more
subclasses (each, a "Subclass").
 
    The Certificates of a Series  will represent beneficial ownership  interests
in  a separate trust formed by the Seller.  The property of each such trust (for
each Series,  the  "Trust Estate")  will  be  comprised primarily  of  fixed  or
adjustable  interest  rate, conventional,  first  mortgage loans  (the "Mortgage
Loans"), secured by  one- to  four-family residential  properties. The  Mortgage
Loans  will  have  been  acquired  by the  Seller  from  its  affiliate, Norwest
Mortgage, Inc. ("Norwest Mortgage"), and  will have been underwritten either  to
Norwest  Mortgage's underwriting standards,  to the underwriting  standards of a
Pool Insurer (as defined herein) or to such other standards as are described  in
the applicable Prospectus Supplement. All of the Mortgage Loans will be serviced
by  Norwest Mortgage individually  or together with one  or more other servicers
(each, a  "Servicer"). Norwest  Bank Minnesota,  National Association  ("Norwest
Bank"),  an  affiliate of  Norwest Mortgage,  will act  as master  servicer with
respect to each Trust Estate (in such capacity, the "Master Servicer").
 
    Each Series of Certificates may include one or more Classes of  Certificates
(the "Subordinated Certificates") that are subordinate in right of distributions
or  otherwise to one  or more of the  other Classes of  such Series (the "Senior
Certificates"). If  specified  in  the  applicable  Prospectus  Supplement,  the
relative  interests of the Senior Certificates and the Subordinated Certificates
of a Series in the Trust Estate may  be subject to adjustment from time to  time
on  the basis of distributions received  in respect thereof and losses allocated
to the  Subordinated  Certificates.  If  and to  the  extent  specified  in  the
Prospectus  Supplement,  credit  support  may  be  provided  for  any  Series of
Certificates, or any  Classes or Subclasses  thereof, in the  form of a  limited
guarantee,  financial guaranty insurance policy,  surety bond, letter of credit,
mortgage pool insurance  policy, reserve  fund, cross-support or  other form  of
credit enhancement as described herein or therein.
 
    Except  for  the Seller's  limited  obligations in  connection  with certain
breaches  of  its  representations  and  warranties,  certain  undertakings  and
obligations  of  the  Master  Servicer  and  Norwest  Mortgage's  obligations as
Servicer, the Certificates  will not  represent obligations of  the Seller,  the
Master  Servicer or Norwest Mortgage, or any affiliate of the Seller, the Master
Servicer or Norwest Mortgage.
 
    If specified in the  applicable Prospectus Supplement,  an election will  be
made  to  treat the  Trust Estate  (or one  or more  segregated pools  of assets
therein) underlying  a  Series  of  Certificates  as  a  "real  estate  mortgage
investment  conduit" (a "REMIC")  for federal income  tax purposes. See "Certain
Federal Income Tax Consequences."
 
    There will have  been no public  market for the  Certificates of any  Series
prior to the offering thereof. No assurance can be given that such a market will
develop,   or   that  if   such  a   market  does   develop,  it   will  provide
Certificateholders with liquidity of investment or will continue for the life of
the Certificates.
                            ------------------------
 
THESE SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES  AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND  EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON
      THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO
            THE                  CONTRARY IS A CRIMINAL OFFENSE.
                            ------------------------
 
    The Certificates may be sold from time to time through one or more different
methods, including through underwriting syndicates  led by one or more  managing
underwriters  or through  one or  more underwriters  acting alone.  See "Plan of
Distribution." Affiliates of the Seller may from  time to time act as agents  or
underwriters in connection with the sale of the Certificates.
 
    This  Prospectus may not be used  to consummate sales of Certificates unless
accompanied by  the  Prospectus Supplement  relating  to the  offering  of  such
Certificates.
                            ------------------------
 
                 THE DATE OF THIS PROSPECTUS IS AUGUST 19, 1996
<PAGE>
 
                                    REPORTS
 
    The  Master Servicer  will prepare,  and the  Trustee or  other Paying Agent
appointed  for  each  Series  by  the  Master  Servicer  will  forward  to   the
Certificateholders of each Series statements containing information with respect
to  principal and interest  payments and the related  Trust Estate, as described
herein  and  in  the  applicable  Prospectus  Supplement  for  such  Series.  No
information  contained in such reports will  have been examined or reported upon
by an independent public accountant. See "The Pooling and Servicing Agreement --
Reports to Certificateholders." In addition, each Servicer for each Series  will
furnish  to the Master Servicer (who will be required to furnish promptly to the
Trustee for  such  Series),  a  statement from  a  firm  of  independent  public
accountants  with respect  to the examination  of certain  documents and records
relating to a random sample of mortgage loans serviced by such Servicer pursuant
to the related Underlying Servicing  Agreement and/or other similar  agreements.
See  "Servicing of the Mortgage  Loans -- Evidence as  to Compliance." Copies of
the statements provided by the Master Servicer to the Trustee will be  furnished
to  Certificateholders of each Series upon  request addressed to the Trustee for
the applicable Series  or to  the Master  Servicer c/o  Norwest Bank  Minnesota,
National  Association, 11000 Broken Land Parkway, Columbia, Maryland 21044-3562,
Attention: Securities Administration Services Manager.
 
                             ADDITIONAL INFORMATION
 
    This Prospectus contains, and the  Prospectus Supplement for each Series  of
Certificates  will contain,  a summary  of the  material terms  of the documents
referred to herein and therein, but neither contains nor will contain all of the
information set forth in the Registration Statement of which this Prospectus  is
a  part.  For  further  information,  reference  is  made  to  such Registration
Statement and  the  exhibits  thereto  which  the  Seller  has  filed  with  the
Securities  and Exchange Commission (the  "Commission"), Washington, D.C., under
the Securities  Act  of 1933,  as  amended (the  "Securities  Act").  Statements
contained in this Prospectus and any Prospectus Supplement as to the contents of
any  contract or other document referred to are summaries and, in each instance,
reference is made  to the copy  of the contract  or other document  filed as  an
exhibit  to the Registration  Statement, each such  statement being qualified in
all respects by  such reference.  Copies of  the Registration  Statement may  be
obtained  from the Public Reference Section  of the Commission, Washington, D.C.
20549 upon payment of the prescribed charges, or may be examined free of  charge
at the Commission's offices, 450 Fifth Street N.W., Washington, D.C. 20549 or at
the  regional offices of the Commission located at Room 1400, 75 Park Place, New
York, New York 10007 and 14th Floor, 500 West Madison Street, Chicago,  Illinois
60661.  The Commission also maintains  a site on the  World Wide Web at "http://
www.sec.gov" at which users can view  and download copies of reports, proxy  and
information  statements and  other information filed  electronically through the
Electronic Data Gathering, Analysis and  Retrieval ("EDGAR") system. The  Seller
has  filed the Registration  Statement, including all  exhibits thereto, through
the EDGAR system  and therefore such  materials should be  available by  logging
onto  the  Commission's Web  site. The  Commission maintains  computer terminals
providing access to the EDGAR system at  each of the offices referred to  above.
Copies  of any  documents incorporated herein  by reference will  be provided to
each person  to whom  a Prospectus  is delivered  upon written  or oral  request
directed   to  Norwest  Asset  Securities   Corporation,  5325  Spectrum  Drive,
Frederick, Maryland 21701, telephone number (301) 846-8881.
 
                        ADDITIONAL DETAILED INFORMATION
 
    The  Seller  intends  to  offer  by  subscription  detailed  mortgage   loan
information in machine readable format updated on a monthly basis (the "Detailed
Information")  with  respect to  each  outstanding Series  of  Certificates. The
Detailed Information  will  reflect payments  made  on the  individual  mortgage
loans, including prepayments in full and in part made on such mortgage loans, as
well  as the liquidation of  any such mortgage loans,  and will identify various
characteristics of the mortgage loans.  Subscribers of the Detailed  Information
are  expected to include a number of major investment brokerage firms as well as
financial information  service  firms. Some  of  such firms,  including  certain
 
                                       2
<PAGE>
investment   brokerage  firms  as  well  as  Bloomberg  L.P.  through  the  "The
Bloomberg-Registered Trademark-" service and Merrill Lynch Mortgage Capital Inc.
through the "CMO  Passport -Registered Trademark-"  service, may, in  accordance
with  their  individual  business  practices and  fee  schedules,  if  any, make
portions of, or summaries of portions of, the Detailed Information available  to
their  customers  and subscribers.  The Seller,  the  Master Servicer  and their
respective affiliates have no  control over and take  no responsibility for  the
actions   of  such  firms   in  processing,  analyzing   or  disseminating  such
information. For  further information  regarding  the Detailed  Information  and
subscriptions thereto, please contact Norwest Asset Securities Corporation, 5325
Spectrum Drive, Frederick, Maryland 21701, telephone number (301) 846-8881.
 
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
    There  are incorporated herein by reference  all documents and reports filed
or caused to  be filed  by NASCOR  with respect to  a Trust  Estate pursuant  to
Section  13(a), 13(c), 14 or 15(d) of the Exchange Act, prior to the termination
of an offering of Certificates  evidencing interests therein. Upon request,  the
Master  Servicer will  provide or  cause to be  provided without  charge to each
person to whom this Prospectus is  delivered in connection with the offering  of
one  or more Classes of Certificates a list identifying all filings with respect
to a Trust Estate pursuant to Section 13(a), 13(c), 14 or 15(d) of the  Exchange
Act  since NASCOR's latest fiscal year covered by its annual report on Form 10-K
and a copy of any or all documents or reports incorporated herein by  reference,
in  each case to the extent  such documents or reports relate  to one or more of
such Classes of  such Certificates, other  than the exhibits  to such  documents
(unless  such  exhibits  are  specifically  incorporated  by  reference  in such
documents). Requests to the Master Servicer should be directed to: Norwest Asset
Securities  Corporation,  5325  Spectrum   Drive,  Frederick,  Maryland   21701,
telephone number (301) 846-8881.
 
                                       3
<PAGE>
                               TABLE OF CONTENTS
                                   PROSPECTUS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
Reports....................................................................................................          2
Additional Information.....................................................................................          2
Additional Detailed Information............................................................................          2
Incorporation of Certain Information by Reference..........................................................          3
Summary of Prospectus......................................................................................          8
  Title of Securities......................................................................................          8
  Seller...................................................................................................          8
  Servicers................................................................................................          8
  Master Servicer..........................................................................................          8
  The Trust Estates........................................................................................          8
  Description of the Certificates..........................................................................          9
  Distributions on the Certificates........................................................................          9
  Cut-Off Date.............................................................................................          9
  Distribution Dates.......................................................................................          9
  Record Dates.............................................................................................         10
  Credit Enhancement.......................................................................................         10
  Periodic Advances........................................................................................         10
  Forms of Certificates....................................................................................         11
  Optional Purchase of Defaulted Mortgage Loans............................................................         11
  Optional Purchase of All Mortgage Loans..................................................................         11
  ERISA Limitations........................................................................................         11
  Tax Status...............................................................................................         12
  Legal Investment.........................................................................................         12
  Rating...................................................................................................         12
Risk Factors...............................................................................................         13
  Limited Liquidity........................................................................................         13
  Limited Obligations......................................................................................         13
  Limitations, Reduction and Substitution of Credit Enhancement............................................         13
  Risks of the Mortgage Loans..............................................................................         14
  Yield and Prepayment Considerations......................................................................         14
  Book-Entry System for Certain Classes and Subclasses of Certificates.....................................         15
The Trust Estates..........................................................................................         15
  General..................................................................................................         15
  Mortgage Loans...........................................................................................         15
    Fixed Rate Loans.......................................................................................         16
    Adjustable Rate Loans..................................................................................         17
    Graduated Payment Loans................................................................................         17
    Subsidy Loans..........................................................................................         17
    Buy-Down Loans.........................................................................................         18
    Balloon Loans..........................................................................................         19
The Seller.................................................................................................         19
Norwest Mortgage...........................................................................................         19
Norwest Bank...............................................................................................         20
The Mortgage Loan Programs.................................................................................         20
  Mortgage Loan Production Sources.........................................................................         20
  Acquisition of Mortgage Loans from Correspondents........................................................         21
  Mortgage Loan Underwriting...............................................................................         21
    Norwest Mortgage Underwriting..........................................................................         21
</TABLE>
 
                                       4
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
    Pool Certification Underwriting........................................................................         25
  Representations and Warranties...........................................................................         27
Description of the Certificates............................................................................         30
  General..................................................................................................         30
  Definitive Form..........................................................................................         31
  Book-Entry Form..........................................................................................         32
  Distributions to Certificateholders......................................................................         33
    General................................................................................................         33
    Distributions of Interest..............................................................................         35
    Distributions of Principal.............................................................................         35
  Other Credit Enhancement.................................................................................         37
    Limited Guarantee......................................................................................         37
    Financial Guaranty Insurance Policy or Surety Bond.....................................................         37
    Letter of Credit.......................................................................................         37
    Pool Insurance Policies................................................................................         38
    Special Hazard Insurance Policies......................................................................         38
    Mortgagor Bankruptcy Bond..............................................................................         38
    Reserve Fund...........................................................................................         38
    Cross Support..........................................................................................         38
Prepayment and Yield Considerations........................................................................         39
  Pass-Through Rates.......................................................................................         39
  Scheduled Delays in Distributions........................................................................         39
  Effect of Principal Prepayments..........................................................................         39
  Weighted Average Life of Certificates....................................................................         40
Servicing of the Mortgage Loans............................................................................         41
  The Master Servicer......................................................................................         41
  The Servicers............................................................................................         42
  Payments on Mortgage Loans...............................................................................         43
  Periodic Advances and Limitations Thereon................................................................         46
  Collection and Other Servicing Procedures................................................................         47
  Enforcement of Due-on-Sale Clauses; Realization Upon Defaulted Mortgage Loans............................         47
  Insurance Policies.......................................................................................         49
  Fixed Retained Yield, Servicing Compensation and Payment of Expenses.....................................         50
  Evidence as to Compliance................................................................................         51
Certain Matters Regarding the Master Servicer..............................................................         52
The Pooling and Servicing Agreement........................................................................         53
  Assignment of Mortgage Loans to the Trustee..............................................................         53
  Optional Purchases.......................................................................................         54
  Reports to Certificateholders............................................................................         55
  List of Certificateholders...............................................................................         56
  Events of Default........................................................................................         56
  Rights Upon Event of Default.............................................................................         56
  Amendment................................................................................................         57
  Termination; Optional Purchase of Mortgage Loans.........................................................         58
  The Trustee..............................................................................................         58
Certain Legal Aspects of the Mortgage Loans................................................................         59
  General..................................................................................................         59
  Foreclosure..............................................................................................         59
  Foreclosure on Shares of Cooperatives....................................................................         60
  Rights of Redemption.....................................................................................         61
  Anti-Deficiency Legislation and Other Limitations on Lenders.............................................         61
</TABLE>
 
                                       5
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
  Soldiers' and Sailors' Civil Relief Act and Similar Laws.................................................         63
  Environmental Considerations.............................................................................         63
  "Due-on-Sale" Clauses....................................................................................         64
  Applicability of Usury Laws..............................................................................         65
  Enforceability of Certain Provisions.....................................................................         65
Certain Federal Income Tax Consequences....................................................................         66
  Federal Income Tax Consequences for REMIC Certificates...................................................         66
  General..................................................................................................         66
  Status of REMIC Certificates.............................................................................         67
  Qualification as a REMIC.................................................................................         67
  Taxation of Regular Certificates.........................................................................         69
    General................................................................................................         69
    Original Issue Discount................................................................................         69
    Acquisition Premium....................................................................................         72
    Variable Rate Regular Certificates.....................................................................         72
    Market Discount........................................................................................         73
    Premium................................................................................................         74
    Election to Treat All Interest Under the Constant Yield Method.........................................         74
    Treatment of Losses....................................................................................         75
    Sale or Exchange of Regular Certificates...............................................................         75
  Taxation of Residual Certificates........................................................................         76
    Taxation of REMIC Income...............................................................................         76
    Basis and Losses.......................................................................................         76
    Treatment of Certain Items of REMIC Income and Expense.................................................         78
    Original Issue Discount and Premium....................................................................         78
    Market Discount........................................................................................         78
    Premium................................................................................................         78
    Limitations on Offset or Exemption of REMIC Income.....................................................         79
    Tax-Related Restrictions on Transfer of Residual Certificates..........................................         80
    Disqualified Organizations.............................................................................         80
    Noneconomic Residual Interests.........................................................................         81
    Foreign Investors......................................................................................         81
    Sale or Exchange of a Residual Certificate.............................................................         82
    Mark to Market Regulations.............................................................................         82
  Taxes That May Be Imposed on the REMIC Pool..............................................................         83
    Prohibited Transactions................................................................................         83
    Contributions to the REMIC Pool After the Startup Day..................................................         83
    Net Income from Foreclosure Property...................................................................         83
  Liquidation of the REMIC Pool............................................................................         83
  Administrative Matters...................................................................................         83
  Limitations on Deduction of Certain Expenses.............................................................         84
  Taxation of Certain Foreign Investors....................................................................         84
    Regular Certificates...................................................................................         84
    Residual Certificates..................................................................................         85
  Backup Withholding.......................................................................................         85
  Reporting Requirements...................................................................................         85
</TABLE>
 
                                       6
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
  Federal Income Tax Consequences for Certificates as to Which No REMIC Election is Made...................         86
    General................................................................................................         86
    Tax Status.............................................................................................         87
    Premium and Discount...................................................................................         87
    Premium................................................................................................         88
    Original Issue Discount................................................................................         88
    Market Discount........................................................................................         88
    Recharacterization of Servicing Fees...................................................................         88
    Sale or Exchange of Certificates.......................................................................         89
  Stripped Certificates....................................................................................         89
    General................................................................................................         89
    Status of Stripped Certificates........................................................................         91
    Taxation of Stripped Certificates......................................................................         91
    Original Issue Discount................................................................................         91
    Sale or Exchange of Stripped Certificates..............................................................         92
    Purchase of More Than One Class of Stripped Certificates...............................................         92
    Possible Alternative Characterizations.................................................................         92
  Reporting Requirements and Backup Withholding............................................................         92
  Taxation of Certain Foreign Investors....................................................................         93
ERISA Considerations.......................................................................................         93
  General..................................................................................................         93
  Certain Requirements Under ERISA.........................................................................         93
    General................................................................................................         93
    Parties in Interest/Disqualified Persons...............................................................         93
    Delegation of Fiduciary Duty...........................................................................         94
  Administrative Exemptions................................................................................         94
    Individual Administrative Exemptions...................................................................         94
    PTE 83-1...............................................................................................         96
  Exempt Plans.............................................................................................         96
  Unrelated Business Taxable Income -- Residual Certificates...............................................         97
Legal Investment...........................................................................................         97
Plan of Distribution.......................................................................................         98
Use of Proceeds............................................................................................         99
Legal Matters..............................................................................................         99
Rating.....................................................................................................        100
Index of Significant Definitions...........................................................................        101
</TABLE>
 
                                       7
<PAGE>
                             SUMMARY OF PROSPECTUS
 
    THE  FOLLOWING IS  QUALIFIED IN  ITS ENTIRETY  BY REFERENCE  TO THE DETAILED
INFORMATION APPEARING  ELSEWHERE IN  THIS PROSPECTUS,  AND BY  REFERENCE TO  THE
INFORMATION  WITH  RESPECT  TO  EACH SERIES  OF  CERTIFICATES  CONTAINED  IN THE
APPLICABLE  PROSPECTUS  SUPPLEMENT.  CERTAIN  CAPITALIZED  TERMS  USED  AND  NOT
OTHERWISE  DEFINED  HEREIN  SHALL  HAVE THE  MEANINGS  GIVEN  ELSEWHERE  IN THIS
PROSPECTUS.
 
<TABLE>
<CAPTION>
Title of Securities...............  Mortgage Pass-Through Certificates (Issuable in Series).
<S>                                 <C>
Seller............................  Norwest Asset Securities  Corporation (the "Seller"),  a
                                    direct,  wholly-owned  subsidiary  of  Norwest Mortgage,
                                    Inc.  ("Norwest  Mortgage"),   which  is  an   indirect,
                                    wholly-owned subsidiary of Norwest Corporation ("Norwest
                                    Corporation"). See "The Seller."
Servicers.........................  Norwest  Mortgage and,  to the  extent specified  in the
                                    applicable Prospectus  Supplement,  one  or  more  other
                                    entities  identified therein  (each, a  "Servicer") will
                                    service the  Mortgage  Loans  contained  in  each  Trust
                                    Estate.  Each  Servicer will  perform  certain servicing
                                    functions with respect to the Mortgage Loans serviced by
                                    it pursuant to a  related Servicing Agreement (each,  an
                                    "Underlying Servicing Agreement"). See "Servicing of the
                                    Mortgage Loans."
Master Servicer...................  Norwest  Bank Minnesota,  National Association ("Norwest
                                    Bank" and,  in such  capacity, the  "Master  Servicer").
                                    Norwest  Bank  is a  direct, wholly-owned  subsidiary of
                                    Norwest Corporation and an affiliate of the Seller.  The
                                    Master  Servicer  will  perform  certain administration,
                                    calculation and reporting functions with respect to each
                                    Trust Estate and will  supervise the Servicers, in  each
                                    case,  pursuant to a Pooling and Servicing Agreement. In
                                    addition, the Master Servicer will generally be required
                                    to make  Periodic  Advances  (to  the  extent  described
                                    herein) with respect to the Mortgage Loans in each Trust
                                    Estate  to the  extent that the  related Servicer (other
                                    than Norwest Mortgage) fails to make a required Periodic
                                    Advance. See  "Servicing of  the Mortgage  Loans --  The
                                    Master   Servicer"   and  "--   Periodic   Advances  and
                                    Limitations Thereon."
The Trust Estates.................  Each Trust  Estate will  be formed  and each  Series  of
                                    Certificates  will be  issued pursuant to  a pooling and
                                    servicing agreement  (each,  a  "Pooling  and  Servicing
                                    Agreement")  among the  Seller, the  Master Servicer and
                                    the  Trustee  specified  in  the  applicable  Prospectus
                                    Supplement.  Each  Trust  Estate  will  consist  of  the
                                    related Mortgage Loans  (other than  the Fixed  Retained
                                    Yield  (as defined  herein), if  any) and  certain other
                                    related  property,  as   specified  in  the   applicable
                                    Prospectus   Supplement.  The  Mortgage  Loans  will  be
                                    conventional,  fixed   or  adjustable   interest   rate,
                                    mortgage  loans  secured  by  first  liens  on  one-  to
                                    four-family residential properties.
                                    The Mortgage Loans will have been acquired by the Seller
                                    from its affiliate Norwest Mortgage. The Mortgage  Loans
                                    will  have  been originated  by  Norwest Mortgage  or an
                                    affiliate or will have been acquired by Norwest Mortgage
                                    directly  or   indirectly  from   other  mortgage   loan
                                    originators.  All of  the Mortgage Loans  will have been
                                    underwritten either to Norwest
</TABLE>
 
                                       8
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    Mortgage's standards,  to the  extent specified  in  the
                                    applicable  Prospectus Supplement, to the standards of a
                                    Pool Insurer or to standards otherwise specified in  the
                                    Prospectus  Supplement. See "The Trust Estates" and "The
                                    Mortgage Loan Programs -- Mortgage Loan Underwriting."
                                    The particular characteristics or expected
                                    characteristics of the Mortgage Loans and a  description
                                    of  the  other property,  if  any, included  in  a Trust
                                    Estate will be  set forth in  the applicable  Prospectus
                                    Supplement.
Description of the Certificates...  Each  Series of  Certificates will  include one  or more
                                    Classes,  any   of  which   may  consist   of   multiple
                                    Subclasses.  A Class or Subclass of Certificates will be
                                    entitled, to the  extent of funds  available, to  either
                                    (i)  principal and  interest payments in  respect of the
                                    related Mortgage  Loans, (ii)  principal  distributions,
                                    with   no   interest   distributions,   (iii)   interest
                                    distributions, with no  principal distributions or  (iv)
                                    such   other  distributions  as  are  described  in  the
                                    applicable Prospectus Supplement.
Distributions on the
Certificates......................  INTEREST. With respect to  each Series of  Certificates,
                                    interest  on the related Mortgage  Loans at the weighted
                                    average  of  the  applicable  Mortgage  Interest   Rates
                                    thereof (net of servicing fees and certain other amounts
                                    as  described  herein  or in  the  applicable Prospectus
                                    Supplement), will be  passed through to  holders of  the
                                    related  Classes  of Certificates  in the  aggregate, in
                                    accordance with the particular terms of each such  Class
                                    of Certificates. See "Description of the Certificates --
                                    Distributions  to Certificateholders -- Distributions of
                                    Interest" herein. Except as  otherwise specified in  the
                                    applicable Prospectus Supplement, interest on each Class
                                    and  Subclass of Certificates of each Series will accrue
                                    at the  pass-through rate  for each  Class and  Subclass
                                    indicated in the applicable Prospectus Supplement (each,
                                    a  "Pass-Through  Rate")  on  the  outstanding principal
                                    balance or notional amount thereof.
                                    PRINCIPAL. With  respect to  a Series  of  Certificates,
                                    principal   payments  (including  prepayments)  will  be
                                    passed through to holders of the related Certificates or
                                    otherwise applied in accordance with the related Pooling
                                    and  Servicing  Agreement  on  each  Distribution  Date.
                                    Distributions  in reduction of principal balance will be
                                    allocated  among   the   Classes   and   Subclasses   of
                                    Certificates  of a Series in the manner specified in the
                                    applicable Prospectus  Supplement. See  "Description  of
                                    the  Certificates -- Distributions to Certificateholders
                                    -- Distributions of Principal."
Cut-Off Date......................  The  date   specified  in   the  applicable   Prospectus
                                    Supplement.
Distribution Dates................  Distributions on the Certificates will generally be made
                                    on  the 25th day (or, if such day is not a business day,
                                    the business day following the 25th day) of each  month,
                                    commencing  with the month following  the month in which
                                    the   applicable   Cut-Off   Date   occurs   (each,    a
                                    "Distribution  Date"). If so specified in the applicable
                                    Prospectus Supplement, distributions on
</TABLE>
 
                                       9
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    Certificates may  be made  on a  different day  of  each
                                    month or may be made quarterly, or semi-annually, on the
                                    dates specified in such Prospectus Supplement.
Record Dates......................  Distributions  will be made on each Distribution Date to
                                    Certificateholders of record at the close of business on
                                    (unless a different date is specified in the  applicable
                                    Prospectus  Supplement)  the  last business  day  of the
                                    month preceding  the month  in which  such  Distribution
                                    Date occurs (each, a "Record Date").
Credit Enhancement................  A Series of Certificates may include one or more Classes
                                    of  Senior  Certificates  and  one  or  more  Classes of
                                    Subordinated Certificates. The rights of the holders  of
                                    Subordinated   Certificates  of  a   Series  to  receive
                                    distributions with respect to the related Mortgage Loans
                                    will be subordinated  to such rights  of the holders  of
                                    the Senior Certificates of the same Series to the extent
                                    and  in the manner specified  in the applicable Prospec-
                                    tus  Supplement.  This  subordination  is  intended   to
                                    enhance  the  likelihood of  the  timely receipt  by the
                                    Senior Certificateholders of  their proportionate  share
                                    of  scheduled monthly principal and interest payments on
                                    the related Mortgage Loans  and to protect them  against
                                    losses.  This  protection will  be  effected by  (i) the
                                    preferential right of  the Senior Certificateholders  to
                                    receive, prior to any distribution being made in respect
                                    of  the related  Subordinated Certificates  on each Dis-
                                    tribution Date,  current  distributions on  the  related
                                    Mortgage  Loans of  principal and  interest due  them on
                                    each Distribution Date  out of the  funds available  for
                                    distributions  on such date,  (ii) by the  right of such
                                    holders to receive future distributions on the  Mortgage
                                    Loans  that  would otherwise  have  been payable  to the
                                    holders of Subordinated Certificates and/or (iii) by the
                                    prior allocation to the Subordinated Certificate of  all
                                    or  a  portion  of  losses  realized  on  the underlying
                                    Mortgage Loans.
                                    If so specified in the applicable Prospectus Supplement,
                                    the Certificates  of  any Series,  or  any one  or  more
                                    Classes  thereof, may be  entitled to the  benefits of a
                                    limited guarantee, financial guaranty insurance  policy,
                                    surety  bond, letter of  credit, mortgage pool insurance
                                    policy, reserve  fund, cross-support  or other  form  of
                                    credit   enhancement  as  specified  in  the  applicable
                                    Prospectus Supplement. See "Description of the  Certifi-
                                    cates -- Other Credit Enhancement."
Periodic Advances.................  In  the  event  of  delinquencies  in  payments  on  any
                                    Mortgage Loan, the Servicer servicing such Mortgage Loan
                                    will be obligated  to make advances  of cash  ("Periodic
                                    Advances") to the Servicer Custodial Account (as defined
                                    herein) to the extent that such Servicer determines such
                                    Periodic  Advances  would  be  recoverable  from  future
                                    payments and collections on such Mortgage Loan. Any such
                                    Periodic Advances will be reimbursable to such  Servicer
                                    as  described  herein and  in the  applicable Prospectus
                                    Supplement.  The  Master   Servicer  or  Trustee   will,
</TABLE>
 
                                       10
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    in  certain circumstances, be  required to make Periodic
                                    Advances upon a Servicer default. See "Servicing of  the
                                    Mortgage  Loans  --  Periodic  Advances  and Limitations
                                    Thereon."
Forms of Certificates.............  The Certificates will be issued either (i) in book-entry
                                    form ("Book-Entry Certificates") through the  facilities
                                    of The Depository Trust Company ("DTC") or (ii) in fully
                                    registered, certificated form ("Definitive
                                    Certificates").
                                    An  investor  in  a  Class  or  Subclass  of  Book-Entry
                                    Certificates will  not  receive a  physical  certificate
                                    representing  its ownership interest  in such Book-Entry
                                    Certificates, except  under extraordinary  circumstances
                                    which  are discussed in "Description of the Certificates
                                    -- Definitive  Form" in  this Prospectus.  Instead,  DTC
                                    will  effect  payments  and transfers  by  means  of its
                                    electronic  recordkeeping   services,   acting   through
                                    certain  participating organizations. This may result in
                                    certain  delays  in  receipt  of  distributions  by   an
                                    investor  and  may  restrict  an  investor's  ability to
                                    pledge its securities.  The rights of  investors in  the
                                    Book-Entry  Certificates may generally only be exercised
                                    through DTC  and  its participating  organizations.  See
                                    "Description  of the Certificates -- Book-Entry Form" in
                                    this Prospectus.
Optional Purchase of Defaulted
Mortgage Loans....................  The Seller or the Master  Servicer, may, subject to  the
                                    terms of the applicable Pooling and Servicing Agreement,
                                    purchase  any  defaulted Mortgage  Loan or  any Mortgage
                                    Loan as to which default is reasonably foreseeable  from
                                    the  related  Trust Estate.  See "Pooling  and Servicing
                                    Agreement -- Optional Purchases."
Optional Purchase of All Mortgage
Loans.............................  If  so  specified  in  the  Prospectus  Supplement  with
                                    respect  to a Series, all, but not less than all, of the
                                    Mortgage Loans  in  the  related Trust  Estate  and  any
                                    property acquired in respect thereof at the time, may be
                                    purchased  by the Seller, Norwest Mortgage or such other
                                    party as  is  specified  in  the  applicable  Prospectus
                                    Supplement,  in the manner and at the price specified in
                                    such  Prospectus  Supplement.  In  the  event  that   an
                                    election  is made to treat  the related Trust Estate (or
                                    one or more  segregated pools  of assets  therein) as  a
                                    REMIC,  any such purchase will be effected only pursuant
                                    to a "qualified liquidation,"  as defined under  Section
                                    860F(a)(4)(A)  of the Internal Revenue  Code of 1986, as
                                    amended (the "Code"). Exercise of the right of  purchase
                                    will  effect the early retirement of the Certificates of
                                    that Series. See "Prepayment and Yield Considerations."
ERISA Limitations.................  A fiduciary of any employee benefit plan subject to  the
                                    fiduciary  responsibility  provisions  of  the  Employee
                                    Retirement Income  Security  Act  of  1974,  as  amended
                                    ("ERISA"),  including the "prohibited transaction" rules
                                    thereunder, and to the  corresponding provisions of  the
                                    Code,   should  carefully  review  with  its  own  legal
                                    advisors   whether   the   purchase   or   holding    of
</TABLE>
 
                                       11
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    Certificates could give rise to a transaction prohibited
                                    or  otherwise impermissible under ERISA or the Code. See
                                    "ERISA Considerations."
Tax Status........................  The treatment of the Certificates for federal income tax
                                    purposes will be determined by whether a REMIC  election
                                    is made with respect to a Series of Certificates and, if
                                    a  REMIC election  is made, by  whether the Certificates
                                    are  Regular  Interests   or  Residual  Interests.   See
                                    "Certain Federal Income Tax Consequences."
Legal Investment..................  The   applicable  Prospectus   Supplement  will  specify
                                    whether the  Class or  Classes of  Certificates  offered
                                    will   constitute  "mortgage   related  securities"  for
                                    purposes of  the Secondary  Mortgage Market  Enhancement
                                    Act  of  1984. Investors  whose investment  authority is
                                    subject to legal restrictions  should consult their  own
                                    legal  advisors to determine whether  and to what extent
                                    such Certificates constitute legal investments for them.
                                    See "Legal  Investment"  herein and  in  the  applicable
                                    Prospectus Supplement.
Rating............................  It is a condition to the issuance of the Certificates of
                                    any  Series offered  pursuant to  this Prospectus  and a
                                    Prospectus Supplement  that each  Class or  Subclass  be
                                    rated in one of the four highest rating categories by at
                                    least   one  nationally  recognized  statistical  rating
                                    organization (a "Rating Agency").  A security rating  is
                                    not   a  recommendation   to  buy,  sell   or  hold  the
                                    Certificates of any Series and is subject to revision or
                                    withdrawal at any time  by the assigning rating  agency.
                                    Further,  such  ratings  do not  address  the  effect of
                                    prepayments on the yield anticipated by an investor.
</TABLE>
 
                                       12
<PAGE>
                                  RISK FACTORS
 
    INVESTORS  SHOULD  CONSIDER, AMONG  OTHER THINGS,  THE FOLLOWING  FACTORS IN
CONNECTION WITH THE PURCHASE OF CERTIFICATES.
 
LIMITED LIQUIDITY
 
    There can be no  assurance that a secondary  market for the Certificates  of
any  Series  will  develop  or,  if  it  does  develop,  that  it  will  provide
Certificateholders with liquidity of investment or that it will continue for the
life of the Certificates of any Series. The Prospectus Supplement for any Series
of Certificates may indicate  that an underwriter  specified therein intends  to
establish  a secondary market in such  Certificates, however no underwriter will
be obligated to do so. Unless specified in the applicable Prospectus Supplement,
the Certificates will not be listed on any securities exchange.
 
LIMITED OBLIGATIONS
 
    Except for any  related insurance policies  and any reserve  fund or  credit
enhancement  described in  the applicable Prospectus  Supplement, Mortgage Loans
included in the related Trust Estate will be the sole source of payments on  the
Certificates  of a Series. The Certificates of  any Series will not represent an
interest in or obligation of NASCOR, Norwest Mortgage, Norwest Bank, the Trustee
or any of their affiliates, except for NASCOR's limited obligations with respect
to certain breaches  of its representations  and warranties, Norwest  Mortgage's
obligations  as  Servicer and  Norwest  Bank's obligations  as  Master Servicer.
Neither the Certificates of  any Series nor the  related Mortgage Loans will  be
guaranteed  or insured  by any  governmental agency  or instrumentality, NASCOR,
Norwest Mortgage, Norwest  Bank, the  Trustee, any  of their  affiliates or  any
other person. Consequently, in the event that payments on the Mortgage Loans are
insufficient  or  otherwise unavailable  to make  all  payments required  on the
Certificates, there will  be no  recourse to NASCOR,  Norwest Mortgage,  Norwest
Bank,  the  Trustee  or,  except  as  specified  in  the  applicable  Prospectus
Supplement, any other entity.
 
LIMITATIONS, REDUCTION AND SUBSTITUTION OF CREDIT ENHANCEMENT
 
    With respect  to each  Series  of Certificates,  credit enhancement  may  be
provided  in limited amounts to cover certain  types of losses on the underlying
Mortgage Loans. Credit enhancement will be provided in one or more of the  forms
referred  to  herein,  including, but  not  limited to:  subordination  of other
Classes of Certificates  of the same  Series; a limited  guarantee; a  financial
guaranty  insurance policy; a surety bond; a  letter of credit; a pool insurance
policy; a  special  hazard insurance  policy;  a mortgagor  bankruptcy  bond;  a
reserve  fund; cross-support; and  any combination thereof.  See "Description of
the Certificates -- Other Credit Enhancement" herein. Regardless of the form  of
credit  enhancement provided, the  amount of coverage will  be limited in amount
and in most cases  will be subject  to periodic reduction  in accordance with  a
schedule or formula. Furthermore, such credit enhancements may provide only very
limited  coverage as to certain types of  losses, and may provide no coverage as
to certain other types of losses. All or a portion of the credit enhancement for
any Series of Certificates will generally be permitted to be reduced, terminated
or substituted  for, in  the sole  discretion of  the Master  Servicer, if  each
applicable Rating Agency indicates that the then current rating thereof will not
be  adversely  affected.  In the  event  losses  exceed the  amount  of coverage
provided by any credit enhancement or losses of a type not covered by any credit
enhancement occur,  such losses  will be  borne by  the holders  of the  related
Certificates  (or  certain  Classes  thereof).  The  rating  of  any  Series  of
Certificates by  any  applicable Rating  Agency  may be  lowered  following  the
initial  issuance thereof as a  result of the downgrading  of the obligations of
any applicable credit support provider, or as a result of losses on the  related
Mortgage Loans in excess of the levels contemplated by such Rating Agency at the
time  of its initial rating analysis.  Neither NASCOR, Norwest Mortgage, Norwest
Bank, nor  any  of their  affiliates  will have  any  obligation to  replace  or
supplement  any credit enhancement, or to take  any other action to maintain any
rating of any  Class of Certificates.  See "Description of  the Certificates  --
Other Credit Enhancement."
 
                                       13
<PAGE>
RISKS OF THE MORTGAGE LOANS
 
    An  investment  in  securities  such as  the  Certificates,  which generally
represent interests in pools of residential mortgage loans, may be affected  by,
among  other  things,  a  decline  in real  estate  values  and  changes  in the
mortgagor's financial condition. No  assurance can be given  that the values  of
the  Mortgaged  Properties  (as  defined  herein)  securing  the  Mortgage Loans
underlying any Series  of Certificates  have remained  or will  remain at  their
levels  on  the dates  of  origination of  the  related Mortgage  Loans.  If the
residential real estate market should experience an overall decline in  property
values  such that the outstanding balances of  the Mortgage Loans contained in a
particular  Trust  Estate,  and  any   secondary  financing  on  the   Mortgaged
Properties,  become  equal  to  or  greater  than  the  value  of  the Mortgaged
Properties, the actual rates of delinquencies, foreclosures and losses could  be
higher than those now generally experienced in the mortgage lending industry and
those   experienced  in   Norwest  Mortgage's  or   other  Servicers'  servicing
portfolios. In addition to risk factors  related to the residential real  estate
market  generally, certain geographic regions of  the United States from time to
time will experience weaker regional economic conditions and housing markets  or
be  directly or indirectly  affected by natural  disasters or civil disturbances
such as earthquakes, hurricanes, floods,  eruptions or riots and,  consequently,
will  experience higher  rates of  loss and  delinquency than  on mortgage loans
generally. Although  Mortgaged Properties  located in  certain identified  flood
zones  will be required to be covered, to the maximum extent available, by flood
insurance, as  described under  "Servicing of  the Mortgage  Loans --  Insurance
Policies,"  no Mortgaged  Properties will  otherwise be  required to  be insured
against earthquake  damage of  any other  loss not  covered by  Standard  Hazard
Insurance  Policies,  as described  under "Servicing  of  the Mortgage  Loans --
Insurance  Policies."  Adverse  economic  conditions  generally,  in  particular
geographic  areas  or  industries,  or  affecting  particular  segments  of  the
borrowing community  (such  as  mortgagors  relying  on  commission  income  and
self-employed  mortgagors) and  other factors which  may or may  not affect real
property values (including the purposes for  which the Mortgage Loans were  made
and  the uses  of the  Mortgaged Properties)  may affect  the timely  payment by
mortgagors of scheduled payments of principal and interest on the Mortgage Loans
and, accordingly, the  actual rates  of delinquencies,  foreclosures and  losses
with  respect to any Trust Estate.  The Mortgage Loans underlying certain Series
of Certificates may be concentrated  in certain regions, and such  concentration
may  present  risk considerations  in addition  to  those generally  present for
similar mortgage-backed securities without such concentration. See "The Mortgage
Loan  Programs  --  Mortgage  Loan  Underwriting"  and  "Prepayment  and   Yield
Considerations  -- Weighted Average Life of  Certificates" herein. To the extent
that such losses are not covered  by the applicable credit enhancement,  holders
of  Certificates of the Series evidencing  interests in the related Trust Estate
will bear all risk of loss resulting from default by mortgagors and will have to
look primarily to  the value  of the Mortgaged  Properties for  recovery of  the
outstanding  principal and unpaid interest on  the defaulted Mortgage Loans. See
"The Trust  Estates  -- Mortgage  Loans"  and  "The Mortgage  Loan  Programs  --
Mortgage Loan Underwriting."
 
YIELD AND PREPAYMENT CONSIDERATIONS
 
    The yield of the Certificates of each Series will depend in part on the rate
of  principal payment on the Mortgage Loans (including prepayments, liquidations
due to defaults  and mortgage  loan repurchases).  Such yield  may be  adversely
affected,  depending upon  whether a  particular Certificate  is purchased  at a
premium or  discount  price, by  a  higher or  lower  than anticipated  rate  of
prepayments  on the related Mortgage Loans.  In particular, the yield on Classes
of Certificates  entitling  the  holders thereof  primarily  or  exclusively  to
payments  of interest or primarily or  exclusively to payments of principal will
be extremely sensitive to the rate of prepayments on the related Mortgage Loans.
In addition, the yield on certain Classes of Certificates may be relatively more
sensitive to  the rate  of prepayment  of specified  Mortgage Loans  than  other
Classes  of Certificates. In particular, prepayments  are influenced by a number
of factors,  including  prevailing mortgage  market  interest rates,  local  and
national  economic conditions and homeowner mobility.  In addition, the yield to
investors may be adversely affected by interest shortfalls which may result from
the timing of the receipt of prepayments or liquidations to the extent that such
interest shortfalls  are  not  covered  by aggregate  Servicing  Fees  or  other
mechanisms  specified  in the  applicable  Prospectus Supplement.  The  yield to
 
                                       14
<PAGE>
investors in Classes of  Certificates will be adversely  affected to the  extent
that  losses on the Mortgage Loans in  the related Trust Estate are allocated to
such Classes  and  may  be  adversely  affected  to  the  extent  of  unadvanced
delinquencies  on the  Mortgage Loans  in the  related Trust  Estate. Classes of
Certificates identified in the applicable Prospectus Supplement as  Subordinated
Certificates  are more  likely to be  affected by delinquencies  and losses than
other Classes of Certificates. See "Prepayment and Yield Considerations."
 
BOOK-ENTRY SYSTEM FOR CERTAIN CLASSES AND SUBCLASSES OF CERTIFICATES
 
    Since transactions in the Classes and Subclasses of Book-Entry  Certificates
of  any Series generally can be effected  only through DTC, DTC Participants and
Indirect  DTC  Participants,  the  ability  of  a  Beneficial  Owner  to  pledge
Book-Entry  Certificates to persons  or entities that do  not participate in the
DTC system, or to  otherwise act with respect  to such Book-Entry  Certificates,
may  be limited due  to the lack  of a physical  certificate for such Book-Entry
Certificates. In  addition, under  a book-entry  format, Beneficial  Owners  may
experience delays in their receipt of payments, since distributions will be made
by  the Master Servicer, or a Paying Agent  on behalf of the Master Servicer, to
Cede, as  nominee for  DTC. Also,  issuance of  the Book-Entry  Certificates  in
book-entry form may reduce the liquidity thereof in any secondary trading market
that  may  develop  therefor  because investors  may  be  unwilling  to purchase
securities for which they cannot  obtain delivery of physical certificates.  See
"Description of the Certificates -- Book-Entry Form" herein.
 
                               THE TRUST ESTATES
 
GENERAL
 
    The  Trust Estate for each Series  of Certificates will consist primarily of
Mortgage Loans evidenced by promissory  notes (the "Mortgage Notes") secured  by
mortgages,  deeds  of  trust  or other  instruments  creating  first  liens (the
"Mortgages") on  some or  all of  the following  six types  of property  (as  so
secured,  the "Mortgaged Properties"), to the extent set forth in the applicable
Prospectus  Supplement:  (i)  one-  to  four-family  detached  residences,  (ii)
townhouses,   (iii)   condominium  units,   (iv)   units  within   planned  unit
developments, (v) long-term  leases with respect  to any of  the foregoing,  and
(vi)  shares issued by private  non-profit housing corporations ("cooperatives")
and the related  proprietary leases or  occupancy agreements granting  exclusive
rights to occupy specified units in such cooperatives' buildings. In addition, a
Trust Estate will also include (i) amounts held from time to time in the related
Certificate  Account,  (ii)  the  Seller's  interest  in  any  primary  mortgage
insurance,  hazard  insurance,  title  insurance  or  other  insurance  policies
relating  to  a Mortgage  Loan,  (iii) any  property  which initially  secured a
Mortgage Loan and which  has been acquired by  foreclosure or trustee's sale  or
deed  in lieu of foreclosure  or trustee's sale, (iv)  if applicable, and to the
extent set forth in  the applicable Prospectus Supplement,  any reserve fund  or
funds,  (v)  if  applicable, and  to  the  extent set  forth  in  the applicable
Prospectus Supplement, contractual obligations of any person to make payments in
respect of any form of credit enhancement or any interest subsidy agreement  and
(vi)  such  other  assets  as  may be  specified  in  the  applicable Prospectus
Supplement. The Trust  Estate will not  include the portion  of interest on  the
Mortgage  Loans  which  constitutes  the  Fixed  Retained  Yield,  if  any.  See
"Servicing of the Mortgage Loans -- Fixed Retained Yield, Servicing Compensation
and Payment of Expenses."
 
MORTGAGE LOANS
 
    The Mortgage Loans will have been acquired by the Seller from its affiliate,
Norwest Mortgage.  The  Mortgage Loans  will  have been  originated  by  Norwest
Mortgage or will have been acquired by Norwest Mortgage from other affiliated or
unaffiliated  mortgage  loan  originators.  Each Mortgage  Loan  will  have been
underwritten either to Norwest Mortgage's standards, to the extent specified  in
the  applicable Prospectus Supplement, to the standards  of a Pool Insurer or to
such other standards set forth in the applicable Prospectus Supplement. See "The
Mortgage Loan Programs --  Mortgage Loan Production Sources"  and " --  Mortgage
Loan Underwriting." The Prospectus Supplement for each Series will set forth the
respective number and principal amounts of Mortgage Loans
 
                                       15
<PAGE>
(i)  originated  by Norwest  Mortgage  or its  affiliate  and (ii)  purchased by
Norwest Mortgage or its affiliates  from unaffiliated mortgage loan  originators
through Norwest Mortgage's mortgage loan purchase programs.
 
    Each  of the  Mortgage Loans will  be secured  by a Mortgage  on a Mortgaged
Property located in any of the 50 states or the District of Columbia. Generally,
the land underlying a Mortgaged Property will consist of five acres or less  but
may consist of greater acreage in Norwest Mortgage's discretion.
 
    If specified in the applicable Prospectus Supplement, the Mortgage Loans may
be  secured by leases on real property under circumstances that Norwest Mortgage
determines in its discretion are  commonly acceptable to institutional  mortgage
investors. A Mortgage Loan secured by a lease on real property is secured not by
a  fee simple  interest in the  Mortgaged Property  but rather by  a lease under
which the mortgagor has the right, for a specified term, to use the related real
estate and the residential dwelling located thereon. Generally, a Mortgage  Loan
will  be secured by a lease only if the use of leasehold estates as security for
mortgage loans is customary in the area,  the lease is not subject to any  prior
lien  that could result  in termination of the  lease and the  term of the lease
ends at least five years beyond the maturity date of the related Mortgage  Loan.
The  provisions of each lease securing a Mortgage Loan will expressly permit (i)
mortgaging of the  leasehold estate, (ii)  assignment of the  lease without  the
lessor's consent and (iii) acquisition by the holder of the Mortgage, in its own
or  its  nominee's  name,  of  the rights  of  the  lessee  upon  foreclosure or
assignment in lieu of foreclosure,  unless alternative arrangements provide  the
holder  of the  Mortgage with substantially  similar protections.  No lease will
contain provisions which (i) provide  for termination upon the lessee's  default
without  the holder of the Mortgage being entitled to receive written notice of,
and opportunity to cure, such default, (ii) provide for termination in the event
of damage  or destruction  as long  as the  Mortgage is  in existence  or  (iii)
prohibit  the  holder  of  the  Mortgage from  being  insured  under  the hazard
insurance policy or policies related to the premises.
 
    The Prospectus  Supplement will  set forth  the geographic  distribution  of
Mortgaged  Properties and the number and  aggregate unpaid principal balances of
the Mortgage Loans by category of Mortgaged Property. The Prospectus  Supplement
for  each Series will also set forth the  range of original terms to maturity of
the Mortgage Loans in the Trust  Estate, the weighted average remaining term  to
stated  maturity at the  Cut-Off Date of  such Mortgage Loans,  the earliest and
latest months  of origination  of such  Mortgage Loans,  the range  of  Mortgage
Interest Rates borne by such Mortgage Loans, if such Mortgage Loans have varying
Net  Mortgage Interest Rates, the weighted average Net Mortgage Interest Rate at
the Cut-Off Date of  such Mortgage Loans, the  range of Loan-to-Value Ratios  at
the  time  of origination  of such  Mortgage  Loans and  the range  of principal
balances at origination of such Mortgage Loans.
 
    The information with respect to the Mortgage Loans and Mortgaged  Properties
described  in the  preceding two paragraphs  may be presented  in the Prospectus
Supplement for a Series  as ranges in which  the actual characteristics of  such
Mortgage Loans and Mortgaged Properties are expected to fall. In all such cases,
information  as to the final characteristics of the Mortgage Loans and Mortgaged
Properties will be available in a Current Report on Form 8-K which will be filed
with the  Commission within  15 days  of  the initial  issuance of  the  related
Series.
 
    The  Mortgage Loans in  a Trust Estate will  generally have monthly payments
due on the first of each month (each, a "Due Date") but may, if so specified  in
the  applicable Prospectus Supplement,  have payments due on  a different day of
each month and will be of one of the following types of mortgage loans:
 
    A. FIXED  RATE  LOANS.    If  so  specified  in  the  applicable  Prospectus
Supplement,  a Trust  Estate may  contain fixed-rate,  fully-amortizing mortgage
loans providing for level monthly payments  of principal and interest and  terms
at  origination or modification of  not more than 30  years. If specified in the
applicable Prospectus Supplement, fixed rates  on certain Mortgage Loans may  be
converted  to adjustable rates after origination of such Mortgage Loans and upon
the satisfaction  of other  conditions specified  in the  applicable  Prospectus
Supplement. If so specified in the applicable Prospectus
 
                                       16
<PAGE>
Supplement,  the  Pooling and  Servicing Agreement  will  require the  Seller or
another party to repurchase each such  converted Mortgage Loan at the price  set
forth  in the applicable Prospectus Supplement.  A Trust Estate containing fixed
rate Mortgage Loans may contain convertible Mortgage Loans which have  converted
from  an adjustable interest rate prior to the formation of the Trust Estate and
which are subject to no further conversions.
 
    B. ADJUSTABLE RATE  LOANS.   If so  specified in  the applicable  Prospectus
Supplement, a Trust Estate may contain fully-amortizing adjustable-rate mortgage
loans  having an original or modified term to maturity of not more than 30 years
with a related Mortgage Interest  Rate which generally adjusts initially  either
six  months, one,  three, five,  seven or  ten years  subsequent to  the initial
payment date, and thereafter  at either six-month,  one-year or other  intervals
over  the term of the mortgage loan to equal the sum of a fixed margin set forth
in the related Mortgage Note and an index. The applicable Prospectus  Supplement
will  set forth the relevant index and  the highest, lowest and weighted average
margin with respect to the adjustable  rate mortgage loans in the related  Trust
Estate.  The applicable Prospectus Supplement will also indicate any periodic or
lifetime limitations on changes in  any per annum Mortgage  Rate at the time  of
any adjustment.
 
    If  specified in the  applicable Prospectus Supplement,  adjustable rates on
certain Mortgage Loans may be converted to fixed rates after origination of such
Mortgage Loans and  upon the  satisfaction of  the conditions  specified in  the
applicable  Prospectus  Supplement. If  specified  in the  applicable Prospectus
Supplement, the Seller or another party will generally be required to repurchase
each such  converted Mortgage  Loan at  the price  set forth  in the  applicable
Prospectus  Supplement. A Trust Estate containing adjustable rate Mortgage Loans
may contain  convertible  Mortgage  Loans  which have  converted  from  a  fixed
interest rate prior to the formation of the Trust Estate.
 
    If  so specified in  the applicable Prospectus  Supplement, the Trust Estate
may contain adjustable-rate  mortgage loans which  have Mortgage Interest  Rates
that  generally adjust monthly or may adjust  at other intervals as specified in
the applicable  Prospectus Supplement.  The scheduled  monthly payment  will  be
adjusted  as  and when  described in  the  applicable Prospectus  Supplement (at
intervals different from those at which the Mortgage Interest Rate is  adjusted)
to an amount that would fully amortize the Mortgage Loan over its remaining term
on  a level debt service basis; provided that increases in the scheduled monthly
payment may be  subject to certain  limitations as specified  in the  applicable
Prospectus  Supplement, thereby resulting in negative amortization of principal.
If an adjustment to the  Mortgage Interest Rate on  such a Mortgage Loan  causes
the  amount  of interest  accrued thereon  in  any month  to exceed  the current
scheduled monthly  payment  on  such  mortgage loan,  the  resulting  amount  of
interest  that has accrued but is not then payable ("Deferred Interest") will be
added to the principal balance of such Mortgage Loan.
 
    C. GRADUATED PAYMENT LOANS.   If so specified  in the applicable  Prospectus
Supplement,  a Trust Estate  may contain fixed-rate,  graduated payment mortgage
loans having original or modified  terms to maturity of  not more than 30  years
with  monthly  payments during  the first  year  calculated on  the basis  of an
assumed interest rate which is a specified percentage below the Mortgage Rate on
such mortgage  loan. Such  monthly payments  increase at  the beginning  of  the
second  year  by  a  specified  percentage of  the  monthly  payment  during the
preceding year and  each year specified  thereafter to the  extent necessary  to
amortize the mortgage loan over the remainder of its term. Deferred Interest, if
any, will be added to the principal balance of such mortgage loans.
 
    D.  SUBSIDY LOANS.  If so specified in the applicable Prospectus Supplement,
a Trust Estate may contain Mortgage Loans subject to temporary interest  subsidy
agreements  ("Subsidy Loans") pursuant to which the monthly payments made by the
related mortgagors will  be less  than the  scheduled monthly  payments on  such
Mortgage  Loans with  the present value  of the resulting  difference in payment
("Subsidy Payments") being provided by the employer of the mortgagor,  generally
on  an annual basis.  Subsidy Payments will  generally be placed  in a custodial
account ("Subsidy Account")
 
                                       17
<PAGE>
by the related Servicer. Despite the existence of a subsidy program, a mortgagor
remains primarily liable for making all scheduled payments on a Subsidy Loan and
for all other obligations provided for in the related Mortgage Note and Mortgage
Loan.
 
    Subsidy Loans are offered by employers generally through either a  graduated
or  fixed  subsidy loan  program, or  a  combination thereof.  The terms  of the
subsidy agreements relating  to Subsidy Loans  generally range from  one to  ten
years.  The subsidy agreements relating to  Subsidy Loans made under a graduated
program generally will  provide for  subsidy payments that  result in  effective
subsidized  interest rates between  three percentage points  and five percentage
points below  the Mortgage  Interest  Rates specified  in the  related  Mortgage
Notes.  Generally, under a graduated program, the subsidized rate for a Mortgage
Loan will increase approximately one percentage  point per year until it  equals
the full Mortgage Interest Rate. For example, if the initial subsidized interest
rate is five percentage points below the Mortgage Interest Rate in year one, the
subsidized  rate  will increase  to four  percentage  points below  the Mortgage
Interest Rate in year two, and likewise until year six, when the subsidized rate
will equal the Mortgage Interest Rate. Where the subsidy agreements relating  to
Subsidy  Loans are in effect for longer than five years, the subsidized interest
rates generally increase  at smaller  percentage increments for  each year.  The
subsidy  agreements  relating  to  Subsidy  Loans  made  under  a  fixed program
generally will  provide  for  subsidized interest  rates  at  fixed  percentages
(generally  one percentage  point to two  percentage points)  below the Mortgage
Interest Rates for  specified periods,  generally not  in excess  of ten  years.
Subsidy Loans are also offered pursuant to combination fixed/graduated programs.
The subsidy agreements relating to such Subsidy Loans generally will provide for
an  initial fixed  subsidy of  up to  five percentage  points below  the related
Mortgage Interest Rate for up  to five years, and  then a periodic reduction  in
the  subsidy for up to  five years, at an equal  fixed percentage per year until
the subsidized rate equals the Mortgage Interest Rate.
 
    Generally, employers may terminate subsidy programs in the event of (i)  the
mortgagor's  death, retirement,  resignation or termination  of employment, (ii)
the full prepayment  of the Subsidy  Loan by  the mortgagor, (iii)  the sale  or
transfer by the mortgagor of the related Mortgaged Property as a result of which
the  mortgagee  is  entitled to  accelerate  the  Subsidy Loan  pursuant  to the
"due-on-sale" clause  contained in  the Mortgage,  or (iv)  the commencement  of
foreclosure  proceedings or the acceptance of a  deed in lieu of foreclosure. In
addition, some  subsidy programs  provide  that if  prevailing market  rates  of
interest  on mortgage loans similar to a Subsidy Loan are less than the Mortgage
Interest Rate of such Subsidy Loan, the employer may request that the  mortgagor
refinance  such Subsidy Loan and may  terminate the related subsidy agreement if
the mortgagor fails to refinance such  Subsidy Loan. In the event the  mortgagor
refinances  such Subsidy Loan,  the new loan  will not be  included in the Trust
Estate. See "Prepayment and Yield Considerations" herein. In the event a subsidy
agreement is terminated,  the amount remaining  in the Subsidy  Account will  be
returned  to the employer, and the mortgagor  will be obligated to make the full
amount of  all remaining  scheduled payments,  if any.  The mortgagor's  reduced
monthly  housing expense as a consequence  of payments under a subsidy agreement
is used  by Norwest  Mortgage in  determining certain  expense-to-income  ratios
utilized  in underwriting  a Subsidy  Loan. See  "The Mortgage  Loan Programs --
Mortgage Loan Underwriting."
 
    E. BUY-DOWN LOANS.  If so specified in the applicable Prospectus Supplement,
a Trust Estate may  contain Mortgage Loans subject  to temporary buy-down  plans
("Buy-Down  Loans") pursuant to which the monthly payments made by the mortgagor
during the early  years of the  Mortgage Loan  will be less  than the  scheduled
monthly  payments on the Mortgage Loan. The resulting difference in payment will
be compensated  for from  an amount  contributed by  the seller  of the  related
Mortgaged  Property or another source, including  the originator of the Mortgage
Loan (generally on a present value basis) and, if so specified in the applicable
Prospectus Supplement, placed in  a custodial account  (the "Buy-Down Fund")  by
the  related Servicer. If the mortgagor on a Buy-Down Loan prepays such Mortgage
Loan in  its entirety,  or defaults  on  such Mortgage  Loan and  the  Mortgaged
Property is sold in liquidation thereof, during the period when the mortgagor is
not obligated, on account of the buy-
 
                                       18
<PAGE>
down  plan, to  pay the  full monthly  payment otherwise  due on  such loan, the
unpaid principal balance of  such Buy-Down Loan will  be reduced by the  amounts
remaining  in the  Buy-Down Fund  with respect to  such Buy-Down  Loan, and such
amounts will be deposited in the  Servicer Custodial Account or the  Certificate
Account,  net of  any amounts  paid with  respect to  such Buy-Down  Loan by any
insurer, guarantor or other person pursuant to a credit enhancement  arrangement
described in the applicable Prospectus Supplement.
 
    F.  BALLOON LOANS.  If so specified in the applicable Prospectus Supplement,
a Trust  Estate may  include Mortgage  Loans which  are amortized  over a  fixed
period  not exceeding 30  years but which  have shorter terms  to maturity (each
such Mortgage  Loan, a  "Balloon Loan")  that causes  the outstanding  principal
balance  of the  related Mortgage Loan  to be  due and payable  at the  end of a
certain specified period (the  "Balloon Period"). The  borrower of such  Balloon
Loan  will be obligated to  pay the entire outstanding  principal balance of the
Balloon Loan at  the end of  the related  Balloon Period. In  the event  Norwest
Mortgage  refinances a mortgagor's  Balloon Loan at maturity,  the new loan will
not be included in the Trust  Estate. See "Prepayment and Yield  Considerations"
herein.
 
    A  Trust  Estate may  also include  other types  of first  lien, residential
Mortgage Loans to the extent set forth in the applicable Prospectus Supplement.
 
                                   THE SELLER
 
    Norwest Asset Securities Corporation (the "Seller" or "NASCOR") is a direct,
wholly owned subsidiary of Norwest Mortgage, Inc. and an indirect, wholly  owned
subsidiary  of Norwest  Corporation, a corporation  organized under  the laws of
Delaware ("Norwest Corporation"). The  Seller was incorporated  in the State  of
Delaware on March 28, 1996.
 
    The limited purposes of the Seller are, in general, to acquire, own and sell
mortgage  loans; to  issue, acquire,  own, hold  and sell  mortgage pass-through
securities which represent  ownership interests in  mortgage loans,  collections
thereon  and related properties; and to engage  in any acts which are incidental
to, or necessary, suitable or convenient to accomplish, the foregoing.
 
    The Seller maintains its principal office at 5325 Spectrum Drive, Frederick,
Maryland 21701. Its telephone number is (301) 846-8881.
 
    At the time of  the formation of  any Trust Estate, the  Seller will be  the
sole  owner of all the related Mortgage Loans. The Seller will have acquired the
Mortgage Loans included in any Trust Estate from Norwest Mortgage. Except to the
extent otherwise specified in the applicable Prospectus Supplement, the Seller's
only obligation  with respect  to the  Certificates  of any  Series will  be  to
repurchase  or substitute for Mortgage  Loans in a Trust  Estate in the event of
defective documentation  or  upon  the breach  of  certain  representations  and
warranties  made  by the  Seller. See  "The Pooling  and Servicing  Agreement --
Assignment of Mortgage Loans to the Trustee."
 
                                NORWEST MORTGAGE
 
    Norwest Mortgage, Inc. ("Norwest Mortgage") was originally incorporated as a
Minnesota corporation on July 1, 1983. On August 30, 1995, Norwest Mortgage  and
Directors  Mortgage  Loan  Corporation, a  California  corporation,  completed a
statutory merger.  As  a result  of  the  merger, Norwest  became  a  California
corporation  as of September 1, 1995. Norwest Mortgage is engaged principally in
the business of (i) originating and purchasing residential mortgage loans in its
own name and through its affiliates,  Norwest Funding, Inc. and Norwest  Funding
II,  Inc.  (collectively,  "Norwest  Funding")  and  (ii)  servicing residential
mortgage loans  for  its own  account  or for  the  account of  others.  Norwest
Mortgage  is a  direct, wholly  owned subsidiary  of Norwest  Nova, Inc.  and an
indirect, wholly owned subsidiary of Norwest Corporation. The executive  offices
of  Norwest Mortgage are located  at 405 Southwest 5th  Street, Des Moines, Iowa
50309-4603, and its telephone number is (515) 221-7300.
 
    On May 7,  1996 Norwest  Mortgage and Norwest  Funding acquired  all of  the
mortgage  origination,  servicing  and  secondary  marketing  operations  of The
Prudential Home Mortgage Company, Inc.
 
                                       19
<PAGE>
("PHMC"), an  indirect,  wholly owned  subsidiary  of The  Prudential  Insurance
Company  of  America,  and purchased  certain  mortgage  loans from  PHMC  and a
substantial portion of  PHMC's mortgage servicing  portfolio (such  transaction,
the  "PHMC  Acquisition").  The  Mortgage Loans  included  in  any  Trust Estate
underlying a Series of Certificates may consist of (i) Mortgage Loans originated
by Norwest  Mortgage or  Norwest Funding  or purchased  by Norwest  Mortgage  or
Norwest  Funding from  originators other  than PHMC  ("Norwest Mortgage Loans"),
(ii) Mortgage Loans  originated or  purchased by  PHMC and  acquired by  Norwest
Mortgage  or Norwest Funding  from PHMC as  part of the  PHMC Acquisition ("PHMC
Mortgage Loans")  or (iii)  a combination  of Norwest  Mortgage Loans  and  PHMC
Mortgage Loans.
 
    Norwest  Mortgage is an approved servicer  of FNMA, FHLMC and the Government
National Mortgage Association. As of December  31, 1995, Norwest Mortgage had  a
net worth of approximately $314.8 million.
 
                                  NORWEST BANK
 
    Norwest  Bank Minnesota, National  Association ("Norwest Bank")  will act as
Master Servicer with respect  to each Series. Norwest  Bank is a direct,  wholly
owned  subsidiary of  Norwest Corporation.  Norwest Bank  is a  national banking
association originally  chartered in  1872 and  is engaged  in a  wide range  of
activities typical of a national bank.
 
    Norwest  Bank's principal  office is  located at  Norwest Center,  Sixth and
Marquette, Minneapolis,  Minnesota  55479.  Norwest  Bank  conducts  its  master
servicing  and securities  administration services  at its  offices in Columbia,
Maryland. Its address  there is  11000 Broken Land  Parkway, Columbia,  Maryland
21044-3662 and its telephone number is (410) 884-2000.
 
                           THE MORTGAGE LOAN PROGRAMS
 
MORTGAGE LOAN PRODUCTION SOURCES
 
    Norwest  Mortgage  conducts  a  significant  portion  of  its  mortgage loan
originations through more than 700  loan production offices (the "Loan  Stores")
located  throughout all 50 states. Norwest  Mortgage also conducts a significant
portion of its mortgage loan originations through centralized production offices
located  in  Springfield,   Illinois,  Frederick,   Maryland  and   Minneapolis,
Minnesota.  At the latter locations,  Norwest Mortgage receives applications for
home mortgage  loans on  toll-free telephone  numbers that  can be  called  from
anywhere in the United States.
 
    The  following  are  Norwest  Mortgage's primary  sources  of  mortgage loan
originations: (i) direct contact with prospective borrowers (including borrowers
with mortgage loans currently serviced by Norwest Mortgage or borrowers referred
by borrowers with mortgage loans  currently serviced by Norwest Mortgage),  (ii)
referrals by realtors, other real estate professionals and prospective borrowers
to  the  Loan  Stores, (iii)  referrals  from selected  corporate  clients, (iv)
referrals from  the  private  mortgage  banking group,  a  division  of  Norwest
Funding,  Inc.,  which specializes  in  mortgage loans  with  original principal
balances in excess of the limits of  FNMA and FHLMC, (v) several joint  ventures
into  which  Norwest  Mortgage,  through its  wholly  owned  subsidiary, Norwest
Mortgage Ventures, Inc., has entered with realtors and banking institutions (the
"Joint Ventures") and (vi) referrals from mortgage brokers and similar entities.
In addition to  its own  mortgage loan originations,  Norwest Mortgage  acquires
qualifying mortgage loans from other unaffiliated originators
("Correspondents").  See " -- Acquisition of Mortgage Loans from Correspondents"
below. The relative contribution of each of these sources to Norwest  Mortgage's
business,  measured by  the volume of  loans generated, tends  to fluctuate over
time.
 
    Norwest Mortgage Ventures, Inc. owns at least a 50% interest in each of  the
Joint  Ventures, with the remaining ownership interest  in each being owned by a
realtor or  a  banking institution  having  significant contact  with  potential
borrowers. Mortgage loans that are originated by Joint Ventures in which Norwest
Mortgage's  partners are realtors are generally  made to finance the acquisition
of
 
                                       20
<PAGE>
properties marketed by  such Joint Venture  partners. Applications for  mortgage
loans  originated through  Joint Ventures are  generally taken  by Joint Venture
employees and underwritten by Norwest  Mortgage in accordance with its  standard
underwriting criteria. Such mortgage loans are then closed by the Joint Ventures
in  their own  names and subsequently  purchased by Norwest  Mortgage or Norwest
Funding.
 
    Norwest Mortgage  may  directly  contact  prospective  borrowers  (including
borrowers  with mortgage loans  currently serviced by  Norwest Mortgage) through
general and targeted solicitations. Such  solicitations are made through  direct
mailings,  mortgage  loan  statement  inserts and  television,  radio  and print
advertisements and by telephone.  Norwest Mortgage's targeted solicitations  may
be  based on characteristics such as  the borrower's mortgage loan interest rate
or payment history and  the geographic location of  the mortgaged property.  See
"Prepayment and Yield Considerations" herein.
 
    A  majority  of  Norwest  Mortgage's corporate  clients  are  companies that
sponsor relocation programs  for their  employees and in  connection with  which
Norwest  Mortgage provides mortgage financing. Eligibility for a relocation loan
is based, in  general, on an  employer's providing financial  assistance to  the
relocating  employee in  connection with  a job-required  move. Although Subsidy
Loans are  typically generated  through such  corporate-sponsored programs,  the
assistance extended by the employer need not necessarily take the form of a loan
subsidy.  (Not all  relocation loans are  generated by  Norwest Mortgage through
referrals from its corporate clients; some  relocation loans are generated as  a
result  of referrals from  mortgage brokers and similar  entities and others are
generated through Norwest  Mortgage's acquisition of  mortgage loans from  other
originators.)  Also  among  Norwest  Mortgage's  corporate  clients  are various
professional associations. These  associations, as well  as the other  corporate
clients,  promote the availability of a broad range of Norwest Mortgage mortgage
products to their members or  employees, including refinance loans,  second-home
loans and investment-property loans.
 
ACQUISITION OF MORTGAGE LOANS FROM CORRESPONDENTS
 
    In  order to qualify  for participation in  Norwest Mortgage's mortgage loan
purchase programs, lending institutions must  (i) meet and maintain certain  net
worth  and other financial standards, (ii) demonstrate experience in originating
residential  mortgage  loans,  (iii)  meet  and  maintain  certain   operational
standards,  (iv) evaluate each loan offered  to Norwest Mortgage for consistency
with Norwest  Mortgage's underwriting  guidelines  or the  standards of  a  Pool
Insurer and represent that each loan was underwritten in accordance with Norwest
Mortgage  standards  or the  standards of  a  Pool Insurer  and (v)  utilize the
services of qualified appraisers.
 
    The contractual arrangements with Correspondents may involve the  commitment
by  Norwest Mortgage to accept  delivery of a certain  dollar amount of mortgage
loans over a period of time; this commitment may be satisfied either by delivery
of mortgage  loans  one  at  a  time  or  in  multiples  as  aggregated  by  the
Correspondent. The contractual arrangements with Correspondents may also involve
the  delegation of all underwriting functions to such Correspondents ("Delegated
Underwriting"), which  will  result  in  Norwest  Mortgage  not  performing  any
underwriting  functions prior to acquisition of  the loan but instead relying on
such originators' representations, and Norwest Mortgage's post-purchase  reviews
of  samplings of  mortgage loans  acquired from  such originators  regarding the
originators' compliance with Norwest  Mortgage's underwriting standards. In  all
instances,  however, acceptance by Norwest Mortgage is contingent upon the loans
being found to satisfy Norwest Mortgage's program standards or the standards  of
a  Pool Insurer. Norwest Mortgage may  also acquire portfolios of seasoned loans
in negotiated transactions.
 
MORTGAGE LOAN UNDERWRITING
 
    NORWEST MORTGAGE UNDERWRITING.   Norwest  Mortgage's underwriting  standards
are  applied by  or on  behalf of Norwest  Mortgage to  evaluate the applicant's
credit standing and ability to repay the loan, as well as the value and adequacy
of the mortgaged property as  collateral. The underwriting standards that  guide
the  determination represent a balancing of  several factors that may affect the
ultimate recovery of the loan amount, including, among others, the amount of the
loan, the ratio of the
 
                                       21
<PAGE>
loan amount to the property value (i.e., the lower of the appraised value of the
mortgaged property and the purchase price), the borrower's means of support  and
the  borrower's credit  history. Norwest Mortgage's  guidelines for underwriting
may vary according  to the nature  of the borrower  or the type  of loan,  since
differing  characteristics may  be perceived  as presenting  different levels of
risk. With respect to certain Mortgage Loans, the originators of such loans  may
have  contracted  with unaffiliated  third parties  to perform  the underwriting
process. Except as described  below, Mortgage Loans were  underwritten by or  on
behalf  of  Norwest Mortgage  or,  in the  case  of PHMC  Mortgage  Loans, PHMC,
generally in accordance with the standards and procedures described herein.
 
    Norwest Mortgage utilizes  various systems of  credit scoring as  a tool  to
supplement  the  mortgage  loan  underwriting  process.  Credit  scoring assists
Norwest Mortgage in the mortgage loan approval process by providing  consistent,
objective  measures  of  borrower  credit and  loan  attributes.  Such objective
measures are used to  evaluate loan applications and  assign each application  a
"Credit  Score." The Credit Score is used  to determine the type of underwriting
process  and  which  level  of  underwriter  will  review  the  loan  file.  For
transactions  which are determined  to be low-risk  transactions, based upon the
Credit Score  and  other  parameters (including  the  mortgage  loan  production
source),  the lowest underwriting authority  is generally required. For moderate
and higher risk transactions, higher level underwriters and a full review of the
mortgage file are generally required.  Borrowers who have a satisfactory  Credit
Score  (based upon the mortgage loan production source) are generally subject to
streamlined credit  review  (which relies  on  the credit  scoring  process  for
various  elements of the  underwriting assessments). Such  borrowers may also be
eligible for  a limited  documentation  program and  are generally  permitted  a
greater latitude in the application of borrower debt-to-income ratios.
 
    With respect to all mortgage loans underwritten by Norwest Mortgage, Norwest
Mortgage's  underwriting of  a mortgage  loan may be  based on  data obtained by
parties other than Norwest Mortgage that  are involved at various stages in  the
mortgage  origination  or  acquisition  process.  This  typically  occurs  under
circumstances in which loans are subject  to more than one approval process,  as
when correspondents, certain mortgage brokers or similar entities that have been
approved  by Norwest  Mortgage to  process loans  on its  behalf, or independent
contractors hired by Norwest  Mortgage to perform  underwriting services on  its
behalf   ("contract  underwriters")  make  initial   determinations  as  to  the
consistency  of  loans  with  Norwest  Mortgage  underwriting  guidelines.   The
underwriting  of  mortgage  loans acquired  by  Norwest Mortgage  pursuant  to a
Delegated Underwriting arrangement with a Correspondent is not reviewed prior to
acquisition of the mortgage loan by Norwest Mortgage although the mortgage  loan
file  is  reviewed by  Norwest Mortgage  to confirm  that certain  documents are
included  in   the  file.   Instead,  Norwest   Mortgage  relies   on  (i)   the
Correspondent's  representations  that such  mortgage  loan was  underwritten in
accordance  with   Norwest  Mortgage's   underwriting  standards   and  (ii)   a
post-purchase  review of  a sampling  of all  mortgage loans  acquired from such
originator. In  addition, in  order to  be eligible  to sell  mortgage loans  to
Norwest   Mortgage  pursuant  to  a   Delegated  Underwriting  arrangement,  the
originator must meet certain requirements including, among other things, certain
quality, operational and financial guidelines.
 
    A prospective borrower applying for a mortgage loan is required to  complete
a detailed application. The loan application elicits pertinent information about
the  applicant,  with particular  emphasis on  the applicant's  financial health
(assets, liabilities, income and expenses), the property being financed and  the
type of loan desired. A self-employed applicant may be required to submit his or
her  most  recent  signed federal  income  tax  returns. With  respect  to every
applicant, credit  reports  are  obtained from  commercial  reporting  services,
summarizing   the  applicant's  credit  history   with  merchants  and  lenders.
Significant unfavorable credit information reported by the applicant or a credit
reporting agency must be explained by  the applicant. The credit review  process
generally is streamlined for borrowers with a qualifying Credit Score.
 
    Verifications  of employment,  income, assets  or mortgages  may be  used to
supplement  the  loan  application   and  the  credit   report  in  reaching   a
determination  as  to  the  applicant's  ability  to  meet  his  or  her monthly
obligations on the proposed mortgage loan, as well as his or her other  mortgage
 
                                       22
<PAGE>
payments  (if  any),  living  expenses  and  financial  obligations.  A mortgage
verification involves  obtaining information  regarding the  borrower's  payment
history  with  respect to  any existing  mortgage the  applicant may  have. This
verification is  accomplished by  either having  the present  lender complete  a
verification  of mortgage form, evaluating the  information on the credit report
concerning  the  applicant's   payment  history  for   the  existing   mortgage,
communicating,  either  verbally or  in  writing, with  the  applicant's present
lender or analyzing cancelled checks provided by the applicant. Verifications of
income, assets or  mortgages may  be waived  under certain  programs offered  by
Norwest  Mortgage, but  Norwest Mortgage's  underwriting guidelines  require, in
most instances, a verbal or written  verification of employment to be  obtained.
In  some cases,  employment histories may  be obtained through  V.I.E., Inc., an
affiliate  of  Norwest  Mortgage,  that  obtains  employment  data  from   state
unemployment  insurance departments  or other  state agencies.  In addition, the
loan applicant may be  eligible for a loan  approval process permitting  limited
documentation.  The above  referenced reduced documentation  options and waivers
limit the amount of documentation required for an underwriting decision and have
the effect of increasing  the relative importance of  the credit report and  the
appraisal.  Documentation  requirements vary  based  upon a  number  of factors,
including the purpose of the loan, the amount of the loan, the ratio of the loan
amount to the property  value and the mortgage  loan production source.  Norwest
Mortgage  accepts alternative methods of  verification, in those instances where
verifications are  part  of the  underwriting  decision; for  example,  salaried
income may be substantiated either by means of a form independently prepared and
signed  by the applicant's employer  or by means of  the applicant's most recent
paystub and W-2. In cases where two  or more persons have jointly applied for  a
mortgage  loan,  the  gross  incomes  and expenses  of  all  of  the applicants,
including nonoccupant co-mortgagors, are combined and considered as a unit.
 
    In general, except  for borrowers  meeting certain standards  who apply  for
loans   with  certain   qualifying  characteristics   under  Norwest  Mortgage's
"retention program" applicable to then-current borrowers, borrowers applying for
loans must demonstrate  that the ratio  of their total  monthly housing debt  to
their  monthly gross income, and the ratio  of their total monthly debt to their
monthly gross income do not exceed  certain maximum levels. Such maximum  levels
vary,  and under  the "retention  program" may  not be  applied, depending  on a
number of factors including Loan-to-Value Ratio, a borrower's credit history,  a
borrower's  liquid  net  worth,  the  potential  of  a  borrower  for  continued
employment advancement  or  income  growth,  the  ability  of  the  borrower  to
accumulate  assets or to devote a greater  portion of income to basic needs such
as housing expense, a borrower's Credit Score and the type of loan for which the
borrower is applying. These calculations are based on the amortization  schedule
and the interest rate of the related loan, with each ratio being computed on the
basis  of the proposed monthly mortgage  payment. In the case of adjustable-rate
mortgage loans,  the  interest rate  used  to determine  a  mortgagor's  monthly
payment  for  purposes of  such ratios  may,  in certain  cases, be  the initial
mortgage interest rate or another interest rate, which, in either case, is lower
than the sum of the  index rate that would  have been applicable at  origination
plus  the applicable  margin. In evaluating  applications for  Subsidy Loans and
Buy-Down Loans, such ratios are determined by including in the applicant's total
monthly housing expense  and total  monthly debt the  proposed monthly  mortgage
payment  reduced by the amount  expected to be applied  on a monthly basis under
the related subsidy agreement  or buy-down agreement or,  in certain cases,  the
mortgage payment that would result from an interest rate lower than the Mortgage
Interest Rate but higher than the effective rate to the mortgagor as a result of
the  subsidy  agreement or  the buy-down  agreement. See  "The Trust  Estates --
Mortgage Loans."  Secondary  financing  is permitted  on  mortgage  loans  under
certain  circumstances.  In  those  cases, the  payment  obligations  under both
primary and secondary financing are included  in the computation of the  housing
debt-to-income  ratios, and the  combined amount of  primary and secondary loans
will be  used  to calculate  the  combined loan-to-value  ratio.  Any  secondary
financing  permitted will  generally mature  prior to  the maturity  date of the
related  mortgage  loan.  In  evaluating  an  application  with  respect  to   a
"non-owner-occupied"  property,  which Norwest  Mortgage  defines as  a property
leased to a third party  by its owner (as distinct  from a "second home,"  which
Norwest  Mortgage defines as an owner-occupied,  non-rental property that is not
the owner's principal residence), Norwest Mortgage will include projected rental
income net of
 
                                       23
<PAGE>
certain mortgagor  obligations and  other  assumed expenses  or loss  from  such
property to be included in the applicant's monthly gross income or total monthly
debt  in calculating the foregoing ratios. A  mortgage loan secured by a two- to
four-family Mortgaged Property is considered to be an owner-occupied property if
the borrower occupies  one of the  units; rental  income on the  other units  is
generally  taken into account in evaluating  the borrower's ability to repay the
mortgage loan.
 
    Mortgage Loans will not  generally have had  at origination a  Loan-to-Value
Ratio  in excess of 95%.  However, if so specified  in the applicable Prospectus
Supplement, Mortgage  Loans  that had  Loan-to-Value  Ratios at  origination  in
excess  of 95% may  be included in  the related Trust  Estate. The Loan-to-Value
Ratio is the ratio, expressed  as a percentage, of  the principal amount of  the
Mortgage  Loan at origination  to the lesser  of (i) the  appraised value of the
related Mortgaged  Property, as  established  by an  appraisal obtained  by  the
originator  generally no  more than four  months prior to  origination (or, with
respect to newly  constructed properties, no  more than twelve  months prior  to
origination),  or (ii) the sale price for  such property. In some instances, the
Loan-to-Value Ratio  may be  based on  an  appraisal that  was obtained  by  the
originator  more  than four  months prior  to origination,  provided that  (i) a
recertification of  the original  appraisal is  obtained and  (ii) the  original
appraisal  was obtained no more than twelve months prior to origination. For the
purpose of calculating the Loan-to-Value Ratio of any Mortgage Loan that is  the
result  of  the  refinancing  (including a  refinancing  for  "equity  take out"
purposes) of  an existing  mortgage loan,  the appraised  value of  the  related
Mortgaged Property is generally determined by reference to an appraisal obtained
in  connection with the origination of  the replacement loan. In connection with
certain  of  its  mortgage  originations,  Norwest  Mortgage  currently  obtains
appraisals  through its affiliate, Value Information Technology, Inc. Appraisals
used in connection  with the origination  of the PHMC  Mortgage Loans  generally
were obtained by PHMC through its affiliate, Lender's Service, Inc.
 
    No  assurance  can be  given that  values of  the Mortgaged  Properties have
remained or will remain at  the levels which existed  on the dates of  appraisal
(or,  where applicable, recertification of value) of the related Mortgage Loans.
The appraisal  of any  Mortgaged Property  reflects the  individual  appraiser's
judgment as to value, based on the market values of comparable homes sold within
the  recent past in comparable nearby locations and on the estimated replacement
cost. The appraisal relates both  to the land and to  the structure; in fact,  a
significant  portion  of the  appraised  value of  a  Mortgaged Property  may be
attributable to the value of the land  rather than to the residence. Because  of
the  unique  locations and  special  features of  certain  Mortgaged Properties,
identifying comparable  properties in  nearby locations  may be  difficult.  The
appraised  values of such Mortgaged Properties will be based to a greater extent
on adjustments made  by the  appraisers to  the appraised  values of  reasonably
similar  properties  rather  than  on  objectively  verifiable  sales  data.  If
residential real  estate  values generally  or  in particular  geographic  areas
decline  such  that  the outstanding  balances  of  the Mortgage  Loans  and any
secondary financing on  the Mortgaged  Properties in a  particular Trust  Estate
become  equal to or greater than the values of the related Mortgaged Properties,
the actual rates of delinquencies, foreclosures and losses could be higher  than
those  now generally experienced in the  mortgage lending industry and those now
experienced in  Norwest Mortgage's  servicing portfolios.  In addition,  adverse
economic  conditions generally, in particular geographic areas or industries, or
affecting particular segments  of the  borrowing community  (such as  mortgagors
relying  on commission  income and  self-employed mortgagors)  and other factors
which may or  may not affect  real property values,  including the purposes  for
which the Mortgage Loans were made and the uses of the Mortgaged Properties, may
affect  the timely payment by mortgagors  of scheduled payments of principal and
interest  on  the  Mortgage  Loans   and,  accordingly,  the  actual  rates   of
delinquencies,  foreclosures and  losses with respect  to any  Trust Estate. See
"Prepayment and Yield Considerations --  Weighted Average Life of  Certificates"
herein.  To the extent that such losses are not covered by the methods of credit
support or  the insurance  policies  described herein,  they  will be  borne  by
holders  of the  Certificates of the  Series evidencing interests  in such Trust
Estate.
 
    In  general,  Norwest  Mortgage  does  not  originate  mortgage  loans  with
Loan-to-Value  Ratios  in excess  of 80%  unless  primary mortgage  insurance is
obtained. Loans with Loan-to-Value Ratios
 
                                       24
<PAGE>
exceeding 80% may be approved if primary mortgage insurance is obtained from  an
approved  primary mortgage insurance company. In such cases, the excess over 75%
(or such lower percentage as Norwest  Mortgage may require at origination)  will
be  covered by primary mortgage insurance  until the unpaid principal balance of
the Mortgage Loan is reduced  to an amount that  will result in a  Loan-to-Value
Ratio  less  than or  equal to  80%. With  respect to  the PHMC  Mortgage Loans,
however, PHMC in certain instances did not require primary mortgage insurance on
loans that  had  Loan-to-Value Ratios  exceeding  80%. Only  primary  residences
(excluding  cooperatives) were eligible  for this program.  Each qualifying loan
was made at an interest  rate that was higher than  the rate would have been  if
the  Loan-to-Value Ratio was  80% or less  or if primary  mortgage insurance was
obtained.
 
    Except as described below,  Mortgage Loans will generally  be covered by  an
appropriate  standard  form  American  Land  Title  Association  ("ALTA")  title
insurance policy,  or  a  substantially  similar policy  or  form  of  insurance
acceptable  to the Federal National Mortgage Association ("FNMA") or the Federal
Home Loan  Mortgage  Corporation  ("FHLMC").  Certain  Mortgage  Loans  ("T.O.P.
Loans") originated by Norwest Mortgage or Norwest Funding in connection with the
"Title  Option  Plus"  program  are not  covered  by  title  insurance policies,
although title  searches are  performed in  connection with  the origination  of
T.O.P.  Loans  by American  Land Title  Company, Inc.,  an affiliate  of Norwest
Mortgage. The Seller  will represent  and warrant to  the Trustee  of any  Trust
Estate that the Mortgaged Property related to each Mortgage Loan (including each
T.O.P.  Loan) is free  and clear of  all encumbrances and  liens having priority
over the  first  lien  of  the related  Mortgage,  subject  to  certain  limited
exceptions as set forth below under "-- Representations and Warranties." However
in  the event that a lien senior to the lien of the Mortgage related to a T.O.P.
Loan that is contained in the Trust Estate for any Series is found to exist, the
sole recourse  of the  Trustee will  be against  the Seller  for breach  of  its
representation  and warranty.  The Trustee  will not  have recourse  against any
title insurance company or other party.
 
    Where permitted by law, Norwest Mortgage generally requires that a  borrower
include in each monthly payment a portion of the real estate taxes, assessments,
primary  mortgage insurance (if  applicable), and hazard  insurance premiums and
other similar items with respect to the related mortgage loan. Norwest  Mortgage
may,  however,  on a  case-by-case  basis, in  its  discretion not  require such
advance payments  for certain  Mortgage Loans,  based on  an evaluation  of  the
borrowers' ability to pay such taxes and charges as they become due.
 
    POOL  CERTIFICATION UNDERWRITING.  If specified in the applicable Prospectus
Supplement, certain of  the Mortgage Loans  will have been  reviewed by  General
Electric  Mortgage Insurance Corporation ("GEMICO"), United Guaranty Residential
Insurance Company  ("UGRIC")  or  a  similar  entity  (collectively,  the  "Pool
Insurers")  to  determine  conformity,  in the  aggregate,  with  such company's
respective credit, appraisal and underwriting guidelines. Norwest Mortgage  will
not  have  underwritten  such  Mortgage Loans.  Neither  GEMICO  nor  UGRIC have
underwritten any  of  the  Mortgage  Loans  for  compliance  with  any  investor
guidelines.
 
    Based  on information  provided by the  relevant company, as  a condition to
eligibility of a Mortgage Loan for inclusion in a mortgage pool to be insured by
GEMICO or UGRIC, the loan originator  generally will be required to comply  with
the  following procedures, although exceptions may  be made if permitted by such
company.
 
    Initially, a  prospective  borrower must  fill  out a  detailed  application
providing  pertinent credit  information. The  loan originator  obtains a credit
report,  which  summarizes  the  prospective  borrower's  credit  history   with
merchants  and lenders  and any record  of bankruptcy, or  other pertinent legal
history. In addition,  a verification of  employment for the  last two years  is
made  from either the applicant's employer or a Form W-2 for the most recent two
years  and  the  applicant's   most  recent  pay  stub.   If  an  applicant   is
self-employed,  such applicant  submits copies  of signed  tax returns  with all
schedules for the prior  two years together with  a current year-to-date  profit
and  loss statement and any other  documentation deemed necessary. Rental income
used to qualify the applicant is verified  either by lease agreements or by  the
borrower's    tax   returns.   In   the   case   of   refinancings,   the   loan
 
                                       25
<PAGE>
originator must require, among other things,  that there has not been more  than
one  delinquency  in the  prior 12  months nor,  in the  case of  mortgage loans
reviewed by GEMICO, any delinquency  in the past 90  days on the prior  mortgage
loan.
 
    In  determining the  adequacy of  the Mortgaged  Property as  collateral, an
independent appraisal must be  made of each  property considered for  financing.
Each  appraiser  must be  selected in  accordance with  predetermined guidelines
established for appraisers. The  appraiser is required  to inspect the  property
and  verify that it is in good condition and that construction, if new, has been
completed. The appraisal is  based on the market  value of comparable homes.  No
appraisal  more than six months old will  be accepted by GEMICO and no appraisal
more than 120 days old will be accepted by UGRIC.
 
    Once all applicable employment, credit and property information is received,
a determination must be made by the loan originator (and confirmed on review  by
GEMICO  or UGRIC) as to whether  the prospective borrower has sufficient monthly
income to meet (i) the monthly payment obligations on the proposed mortgage loan
(including principal and interest payments, real estate taxes, insurance on  the
subject  property, and homeowners' association  dues and secondary financing, if
any),  and  (ii)  the  aggregate  of  the  foregoing  and  all  other  financial
obligations  not expected  to be fully  repaid within  the next 10  months. As a
general rule, GEMICO  and UGRIC require  the ratio of  a prospective  borrower's
debt,  as described in clauses (i) and  (ii) above, to such borrower's income to
be 33% and  38%, respectively for  fixed rate, fixed  payment loans. The  ratios
required  for adjustable rate loans are slightly  lower. The general rule may be
varied, and higher debt-to-income ratios may be permitted, in appropriate  cases
characterized by lower Loan-to-Value Ratios or other favorable factors.
 
    In  some  special  cases, GEMICO  and  UGRIC  may underwrite  loans  under a
"limited  documentation"   program.  With   respect  to   such  loans,   limited
investigation   into  the  borrower's  credit  history  and  income  profile  is
undertaken by the originator and such loans may be underwritten primarily on the
basis of  an appraisal  of the  mortgaged property  and Loan-to-Value  Ratio  on
origination.  Thus,  if  the Loan-to-Value  Ratio  is less  than  the percentage
required under standard guidelines, the originator may forego certain aspects of
the review  relating to  monthly income,  and,  in the  case of  mortgage  loans
reviewed  by GEMICO,  traditional ratios of  monthly or total  expenses to gross
income may not be  applied. At a minimum,  a limited documentation program  must
require  a  loan  application,  a  credit  report,  an  appraisal  acceptable to
FNMA/FHLMC  performed  by  an  independent  appraiser,  and  a  verification  of
downpayment  or three months of bank statements. The maximum Loan-to-Value Ratio
allowed under any limited documentation program underwritten by GEMICO and UGRIC
is 70%.  UGRIC's  "limited  documentation" program  is  limited  exclusively  to
self-employed borrowers.
 
    For  any rate  or term  refinance of  a mortgage  loan, or  conversion of an
adjustable rate mortgage  loan, where GEMICO  or UGRIC has  already insured  the
prior  loan, GEMICO or  UGRIC may have determined  a loan's insurability without
reviewing updated  credit or  collateral information.  In the  case of  seasoned
loans, GEMICO or UGRIC may have determined a loan's insurability by performing a
more limited credit and collateral review.
 
    The  foregoing should not be taken as  a full and complete discussion of all
of the procedures undertaken in connection with a particular underwriting.  Both
GEMICO  and UGRIC consider various other  factors including, but not limited to,
reviewing sales contracts,  verifying deposits  and other  assets and  examining
additional supporting documentation in certain instances such as divorce decrees
and   separation  agreements.  Investors  should  consult  the  particular  Pool
Insurer's underwriting guidelines  for more specific  and complete  requirements
regarding  underwriting standards.  Furthermore, the  underwriting process often
results in certain compensating factors being considered to offset the existence
of other negative factors in a loan file.
 
    The use  of pool  certification underwriting  by a  Pool Insurer  in no  way
indicates  that  the  related  Certificates or  Mortgage  Loans  are  insured or
guaranteed  under  a  mortgage  pool  insurance  policy  unless  the  applicable
Prospectus Supplement so specifies.
 
                                       26
<PAGE>
REPRESENTATIONS AND WARRANTIES
 
    In  connection with the transfer of the Mortgage Loans related to any Series
by the  Seller to  the Trust  Estate,  the Seller  will generally  make  certain
representations  and warranties regarding  the Mortgage Loans.  In certain cases
where the Seller acquired some or all of the Mortgage Loans related to a  Series
from  a Correspondent, if so indicated  in the applicable Prospectus Supplement,
the Seller may, rather than itself making representations and warranties,  cause
the  representations and warranties made by the Correspondent in connection with
its sale of Mortgage Loans to Norwest Mortgage or Norwest Funding to be assigned
to the  Trust Estate.  In such  cases, the  Correspondent's representations  and
warranties may have been made as of a date prior to the date of execution of the
Pooling  and Servicing  Agreement. Unless  otherwise provided  in the applicable
Prospectus Supplement, such representations and warranties (whether made by  the
Seller  or another party)  will generally include the  following with respect to
the Mortgage Loans, or each Mortgage Loan, as the case may be:
 
           (i)
           the information set forth in the schedule of Mortgage Loans appearing
           as an exhibit to such Pooling  and Servicing Agreement is correct  in
    all material respects at the date or dates respecting which such information
    is furnished as specified therein;
 
          (ii)
           immediately  prior to the transfer and assignment contemplated by the
           Pooling and Servicing  Agreement, the  Seller is 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
           related Mortgaged Property,  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 Mortgaged Property is
    a condominium unit, any lien for common charges permitted by statute or home
    owners 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 a custodian with, any Mortgage establishes in the Seller a
    valid  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  in  any material
    respect; satisfied, cancelled  or subordinated the  Mortgage or the  related
    Mortgage  Note in whole  or in part;  or 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 reflected in  a document  delivered by  the Seller  to the  Trustee or  a
    custodian together with the related Mortgage;
 
           (v)
           all  taxes, governmental assessments,  insurance premiums, and water,
           sewer and municipal charges previously due and owing have been  paid,
    or  an escrow of  funds in an amount  sufficient to pay  for every such item
    which remains unpaid has  been established to the  extent permitted by  law;
    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  Buy-Down  Loan or  Subsidy Loan  arrangement), for  the payment  of any
    amount required by the Mortgage, except for interest accruing from the  date
    of  the related Mortgage Note  or date of disbursement  of the Mortgage Loan
    proceeds, whichever is  later, to  the date which  precedes by  30 days  the
    first Due Date under the related Mortgage Note;
 
                                       27
<PAGE>
          (vi)
           the  Mortgaged Property  is undamaged  by water,  fire, earthquake or
           earth  movement,  windstorm,  flood,  tornado  or  similar   casualty
    (excluding  casualty  from the  presence  of hazardous  wastes  or hazardous
    substances, as to which the Seller makes no representation), 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  shares in  cooperatives,  the
           Mortgaged  Property consists of  a fee simple  or leasehold 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 an applicable 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 13 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  date of  the  Pooling  and
    Servicing Agreement;
 
                                       28
<PAGE>
          (xv)
           the  Mortgage Loan (except a T.O.P. Loan as described above under "--
           Mortgage  Loan  Underwriting"  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 ALTA 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 and 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 any 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; and the Seller has not
    waived  any  default,  breach,  violation  or  event  of  acceleration;   no
    foreclosure  action is 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   such    Mortgage
 
                                       29
<PAGE>
    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 single  family residential property which may
    include a detached home, townhouse, condominium unit, unit in a planned unit
    development or a leasehold interest with respect to any of the foregoing or,
    in the case of Mortgage Loans  secured by shares of cooperatives, leases  or
    occupancy agreements;
 
       (xxiii)
           with  respect  to  each Buy-Down  Loan,  the funds  deposited  in the
           Buy-Down Fund, if  any, will  be sufficient,  together with  interest
    thereon  at  the rate  customarily  received by  the  Seller on  such funds,
    compounded monthly,  and adding  the  amounts required  to  be paid  by  the
    mortgagor,  to make the  scheduled payments stated in  the Mortgage Note for
    the term of the buy-down agreement; and
 
        (xxiv)
           each Mortgage Loan is  a "Qualified Mortgage"  within the meaning  of
           Section 860G of the Code.
 
    No  representations or warranties are made by  the Seller or any other party
as to the absence or effect of  hazardous wastes or hazardous substances on  any
of  the Mortgaged Properties or  on the lien of any  Mortgage or with respect to
the absence or effect of fraud in the origination of any Mortgage Loan, and  any
loss  or  liability resulting  from  the presence  or  effect of  such hazardous
wastes,   hazardous   substances   or   fraud   will   be   borne   solely    by
Certificateholders.  See  "Certain  Legal  Aspects  of  the  Mortgage  Loans  --
Environmental Considerations" below.
 
    See "The Pooling and Servicing Agreement -- Assignment of Mortgage Loans  to
the  Trustee" for a description of  the limited remedies available in connection
with breaches of the foregoing representations and warranties.
 
                        DESCRIPTION OF THE CERTIFICATES
 
GENERAL
 
    Each Series of Certificates will include one or more Classes, each of  which
may  be  divided into  two  or more  Subclasses.  Any references  herein  to the
characteristics of a Class of Certificates may also describe the characteristics
of  a  Subclass  of  Certificates.  In  addition,  any  Class  or  Subclass   of
Certificates  may consist of two or more non-severable components, each of which
may exhibit any of the  principal or interest payment characteristics  described
herein with respect to a Class of Certificates. A Series may include one or more
Classes  of  Certificates entitled,  to the  extent of  funds available,  to (i)
principal and interest distributions in  respect of the related Mortgage  Loans,
(ii)  principal distributions,  with no  interest distributions,  (iii) interest
distributions, with no principal distributions or (iv) such other  distributions
as are described in the applicable Prospectus Supplement.
 
                                       30
<PAGE>
    Each  Series  of  Certificates will  be  issued  pursuant to  a  Pooling and
Servicing Agreement (the  "Pooling and Servicing  Agreement") among the  Seller,
Norwest  Bank, as the Master  Servicer, and the Trustee  named in the applicable
Prospectus Supplement. An illustrative form  of Pooling and Servicing  Agreement
has  been  filed as  an  exhibit to  the  Registration Statement  of  which this
Prospectus is a part. The following summaries describe certain provisions common
to the Certificates and to each  Pooling and Servicing Agreement. The  summaries
do  not purport to  be complete and are  subject to, and  are qualified in their
entirety by reference  to, all of  the provisions of  the Pooling and  Servicing
Agreement  for  each  Series  of  Certificates  and  the  applicable  Prospectus
Supplement. Wherever particular  sections or  defined terms of  the Pooling  and
Servicing  Agreement are referred to, such sections or defined terms are thereby
incorporated herein  by  reference  from  the  form  of  Pooling  and  Servicing
Agreement filed as an exhibit to the Registration Statement.
 
    Unless   otherwise  specified  in   the  applicable  Prospectus  Supplement,
distributions  to  Certificateholders  of  all  Series  (other  than  the  final
distribution  in retirement of the Certificates) will be made by check mailed to
the address of  the person  entitled thereto (which  in the  case of  Book-Entry
Certificates  will be  DTC) as  it appears  on the  certificate register, except
that, with respect to  any holder of  a Certificate evidencing  not less than  a
certain  minimum denomination set forth in the applicable Prospectus Supplement,
distributions will  be made  by wire  transfer in  immediately available  funds,
provided  that the Master Servicer  or the Paying Agent  acting on behalf of the
Master Servicer shall have been  furnished with appropriate wiring  instructions
not  less than seven business  days prior to the  related Distribution Date. The
final distribution  in  retirement  of  Certificates  will  be  made  only  upon
presentation  and  surrender  of  the  Certificates  at  the  office  or  agency
maintained by the Trustee or other entity for such purpose, as specified in  the
final distribution notice to Certificateholders.
 
    Each  Series  of  Certificates  will represent  ownership  interests  in the
related Trust Estate. An election may be made to treat the Trust Estate (or  one
or  more  segregated  pools of  assets  therein)  with respect  to  a  Series of
Certificates as a REMIC. If such an  election is made, such Series will  consist
of  one or more Classes of  Certificates that will represent "regular interests"
within  the  meaning  of  Code   Section  860G(a)(1)  (such  Class  or   Classes
collectively  referred  to  as  the "Regular  Certificates")  and  one  Class or
Subclass of Certificates with respect to  each REMIC that will be designated  as
the  "residual  interest" within  the meaning  of  Code Section  860G(a)(2) (the
"Residual Certificates")  representing the  right  to receive  distributions  as
specified  in the  Prospectus Supplement for  such Series.  See "Certain Federal
Income Tax Consequences" herein.
 
    The Seller may sell certain Classes  or Subclasses of the Certificates of  a
Series, including one or more Classes of Subordinated Certificates, in privately
negotiated  transactions  exempt  from registration  under  the  Securities Act.
Alternatively, if  so specified  in  a Prospectus  Supplement relating  to  such
Subordinated  Certificates,  the Seller  may offer  one or  more Classes  of the
Subordinated Certificates  of a  Series by  means of  this Prospectus  and  such
Prospectus Supplement.
 
DEFINITIVE FORM
 
    Certificates  of a Series that are  issued in fully registered, certificated
form are  referred  to herein  as  "Definitive Certificates."  Distributions  of
principal of, and interest on, the Definitive Certificates will be made directly
to  holders of  Definitive Certificates  in accordance  with the  procedures set
forth in the Pooling and Servicing  Agreement. The Definitive Certificates of  a
Series offered hereby and by means of the applicable Prospectus Supplements will
be  transferable  and exchangeable  at the  office or  agency maintained  by the
Trustee or  such other  entity for  such  purpose set  forth in  the  applicable
Prospectus  Supplement.  No service  charge  will be  made  for any  transfer or
exchange of Definitive Certificates,  but the Trustee or  such other entity  may
require  payment of  a sum  sufficient to  cover any  tax or  other governmental
charge in connection with such transfer or exchange.
 
    In the event that an election is made  to treat the Trust Estate (or one  or
more  segregated pools  of assets therein)  as a REMIC,  the "residual interest"
thereof will  be issued  as a  Definitive Certificate.  No legal  or  beneficial
interest  in all or  any portion of  any "residual interest"  may be transferred
without the receipt by the transferor and the Trustee of an affidavit signed  by
the transferee stating,
 
                                       31
<PAGE>
among  other things, that the transferee  (i) is not a disqualified organization
within the meaning  of Code  Section 860E(e) or  an agent  (including a  broker,
nominee,  or  middleman) thereof  and  (ii) understands  that  it may  incur tax
liabilities in excess  of any  cash flows  generated by  the residual  interest.
Further, the transferee must state in the affidavit that it (x) historically has
paid  its debts as they have come due, (y) intends to pay its debts as they come
due in the  future and  (z) intends  to pay  taxes associated  with holding  the
residual interest as they become due. The transferor must certify to the Trustee
that, as of the time of the transfer, it has no actual knowledge that any of the
statements made in the transferee affidavit are false and no reason to know that
the  statements made by the  transferee pursuant to clauses  (x), (y) and (z) of
the preceding sentence are false.  See "Certain Federal Income Tax  Consequences
- --  Federal  Income  Tax  Consequences for  REMIC  Certificates  --  Taxation of
Residual Certificates  --  Tax-Related  Restrictions  on  Transfer  of  Residual
Certificates."
 
BOOK-ENTRY FORM
 
    Each  Class or Subclass of the Book-Entry Certificates of a Series initially
will be represented by one or more physical certificates registered in the  name
of  Cede  & Co.  ("Cede"), as  nominee of  DTC,  which will  be the  "holder" or
"Certificateholder" of  such Certificates,  as such  terms are  used herein.  No
person  acquiring an interest in a Book-Entry Certificate (a "Beneficial Owner")
will be entitled to receive a Definitive Certificate representing such  person's
interest  in the Book-Entry  Certificate, except as set  forth below. Unless and
until  Definitive  Certificates  are  issued  under  the  limited  circumstances
described  herein,  all references  to  actions taken  by  Certificateholders or
holders shall, in  the case  of the  Book-Entry Certificates,  refer to  actions
taken  by DTC  upon instructions from  its DTC Participants,  and all references
herein to distributions, notices,  reports and statements to  Certificateholders
or  holders  shall,  in  the  case  of  the  Book-Entry  Certificates,  refer to
distributions, notices, reports and statements to DTC or Cede, as the registered
holder of the Book-Entry Certificates, as  the case may be, for distribution  to
Beneficial Owners in accordance with DTC procedures.
 
    DTC is a limited purpose trust company organized under the laws of the State
of  New York, a member  of the Federal Reserve  System, a "clearing corporation"
within the  meaning of  the New  York Uniform  Commercial Code  and a  "clearing
agency"  registered pursuant  to Section 17A  of the Securities  Exchange Act of
1934, as  amended. DTC  was created  to hold  securities for  its  participating
organizations   ("DTC  Participants")  and  to   facilitate  the  clearance  and
settlement of securities transactions among DTC Participants through  electronic
book-entries,   thereby   eliminating  the   need   for  physical   movement  of
certificates. DTC Participants include securities brokers and dealers (which may
include any underwriter  identified in the  Prospectus Supplement applicable  to
any  Series), banks, trust companies  and clearing corporations. Indirect access
to the DTC system also is available to banks, brokers, dealers, trust  companies
and  other institutions that clear through  or maintain a custodial relationship
with  a  DTC   Participant,  either  directly   or  indirectly  ("Indirect   DTC
Participants").
 
    Under  the rules, regulations and procedures  creating and affecting DTC and
its operations (the "Rules"),  DTC is required to  make book-entry transfers  of
Book-Entry  Certificates among  DTC Participants  on whose  behalf it  acts with
respect to the Book-Entry Certificates and to receive and transmit distributions
of principal of and  interest on the  Book-Entry Certificates. DTC  Participants
and  Indirect DTC Participants  with which Beneficial  Owners have accounts with
respect to the Book-Entry Certificates similarly are required to make book-entry
transfers and receive and transmit such  payments on behalf of their  respective
Beneficial Owners.
 
    Beneficial Owners that are not DTC Participants or Indirect DTC Participants
but  desire  to purchase,  sell  or otherwise  transfer  ownership of,  or other
interests in, Book-Entry Certificates  may do so  only through DTC  Participants
and  Indirect DTC Participants. In addition,  Beneficial Owners will receive all
distributions of principal and  interest from the Master  Servicer, or a  Paying
Agent  on  behalf of  the Master  Servicer, through  DTC Participants.  DTC will
forward such  distributions  to  its DTC  Participants,  which  thereafter  will
forward  them  to Indirect  DTC  Participants or  Beneficial  Owners. Beneficial
Owners will not  be recognized  by the  Trustee or  the Master  Servicer or  any
paying
 
                                       32
<PAGE>
agent  as Certificateholders, as such term is  used in the Pooling and Servicing
Agreement, and Beneficial  Owners will be  permitted to exercise  the rights  of
Certificateholders only indirectly through DTC and its DTC Participants.
 
    Because  DTC can only act on behalf of  DTC Participants, who in turn act on
behalf of  Indirect  DTC  Participants  and certain  banks,  the  ability  of  a
Beneficial  Owner to pledge Book-Entry Certificates  to persons or entities that
do not participate in the DTC system,  or to otherwise act with respect to  such
Book-Entry  Certificates,  may  be  limited  due  to  the  lack  of  a  physical
certificate for such  Book-Entry Certificates. In  addition, under a  book-entry
format,  Beneficial Owners may  experience delays in  their receipt of payments,
since distributions will be made  by the Master Servicer,  or a paying agent  on
behalf of the Master Servicer, to Cede, as nominee for DTC.
 
    DTC  has advised  the Seller that  it will  take any action  permitted to be
taken by a Certificateholder under the  Pooling and Servicing Agreement only  at
the  direction of one  or more DTC  Participants to whose  accounts with DTC the
Book-Entry Certificates are credited. Additionally,  DTC has advised the  Seller
that  it will take such actions with  respect to specified Voting Interests only
at the  direction  of  and on  behalf  of  DTC Participants  whose  holdings  of
Book-Entry  Certificates evidence such specified  Voting Interests. DTC may take
conflicting actions with  respect to  Voting Interests  to the  extent that  DTC
Participants  whose  holdings of  Book-Entry  Certificates evidence  such Voting
Interests authorize divergent action.
 
    Neither the  Seller, the  Master  Servicer nor  the  Trustee will  have  any
responsibility  for any aspect  of the records  relating to or  payments made on
account of beneficial ownership interests of the Book-Entry Certificates held by
Cede, as  nominee for  DTC, or  for maintaining,  supervising or  reviewing  any
records  relating to  such beneficial ownership  interests. In the  event of the
insolvency of DTC,  a DTC Participant  or an Indirect  DTC Participant in  whose
name  Book-Entry  Certificates are  registered,  the ability  of  the Beneficial
Owners of such  Book-Entry Certificates  to obtain  timely payment  and, if  the
limits  of applicable insurance  coverage by the  Securities Investor Protection
Corporation are exceeded or if such coverage is otherwise unavailable,  ultimate
payment,  of amounts distributable with  respect to such Book-Entry Certificates
may be impaired.
 
    The Book-Entry Certificates will be converted to Definitive Certificates and
reissued to  Beneficial Owners  or their  nominees, rather  than to  DTC or  its
nominee,  only if (i)  the Trustee is advised  in writing that  DTC is no longer
willing or able to  discharge properly its  responsibilities as depository  with
respect  to the Book-Entry  Certificates and the  Trustee is unable  to locate a
qualified successor,  (ii)  the  Master  Servicer,  at  its  option,  elects  to
terminate  the book-entry system through DTC or  (iii) after the occurrence of a
dismissal or resignation of the Master Servicer under the Pooling and  Servicing
Agreement,  Beneficial  Owners  representing not  less  than 51%  of  the Voting
Interests of the outstanding Book-Entry Certificates advise the Trustee  through
DTC,  in writing, that the continuation of a book-entry system through DTC (or a
successor thereto) is no longer in the Beneficial Owners' best interest.
 
    Upon the  occurrence of  any event  described in  the immediately  preceding
paragraph,  the Trustee will be required to notify all Beneficial Owners through
DTC Participants of the availability of Definitive Certificates. Upon  surrender
by DTC of the physical certificates representing the Book-Entry Certificates and
receipt  of instructions for re-registration, the Trustee will reissue the Book-
Entry  Certificates  as  Definitive  Certificates  to  Beneficial  Owners.   The
procedures  relating to payment on and transfer of Certificates initially issued
as  Definitive   Certificates  will   thereafter  apply   to  those   Book-Entry
Certificates that have been reissued as Definitive Certificates.
 
DISTRIBUTIONS TO CERTIFICATEHOLDERS
 
    GENERAL.  On each Distribution Date, each holder of a Certificate of a Class
will be entitled to receive its Certificate's Percentage Interest of the portion
of  the Pool Distribution Amount (as defined below) allocated to such Class. The
undivided percentage  interest (the  "Percentage Interest")  represented by  any
Certificate  of a  Subclass or  any Class in  distributions to  such Subclass or
Class will be
 
                                       33
<PAGE>
equal to the percentage obtained by  dividing the initial principal balance  (or
notional  amount) of such Certificate by the aggregate initial principal balance
(or notional amount) of all Certificates of such Subclass or Class, as the  case
may be.
 
    In  general, the funds available for distribution to Certificateholders of a
Series of Certificates with  respect to each Distribution  Date for such  Series
(the "Pool Distribution Amount") will be the sum of all previously undistributed
payments  or  other  receipts  on  account  of  principal  (including  principal
prepayments and Liquidation Proceeds, if any)  and interest on or in respect  of
the  related Mortgage Loans  received by the related  Servicer after the Cut-Off
Date (except for amounts due  on or prior to the  Cut-Off Date), or received  by
the  related Servicer on or prior to the  Cut-Off Date but due after the Cut-Off
Date, in either  case received on  or prior  to the business  day preceding  the
Determination Date in the month in which such Distribution Date occurs, plus all
Periodic  Advances with respect to  payments due to be  received on the Mortgage
Loans on  the Due  Date  preceding such  Distribution  Date, but  excluding  the
following:
 
           (a)
           amounts received as late payments of principal or interest respecting
           which one or more unreimbursed Periodic Advances has been made;
 
           (b)
           that  portion of Liquidation Proceeds with respect to a Mortgage Loan
           which represents any unreimbursed Periodic Advances;
 
           (c)
           those portions of each payment  of interest on a particular  Mortgage
           Loan  which represent (i) the Fixed  Retained Yield, if any, (ii) the
    applicable Servicing Fee,  (iii) the applicable  Master Servicing Fee,  (iv)
    the  Trustee's fee  and (v)  any other  amounts described  in the applicable
    Prospectus Supplement;
 
           (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  proceeds (including Liquidation Proceeds  other than, in certain
           cases  as  specified   in  the   applicable  Prospectus   Supplement,
    Liquidation  Proceeds which  were received  prior to  the related Servicer's
    determination that no further recoveries  on a defaulted Mortgage Loan  will
    be  forthcoming ("Partial Liquidation Proceeds"))  of any Mortgage Loans, or
    property acquired  in respect  thereof,  that were  liquidated,  foreclosed,
    purchased  or repurchased pursuant  to the applicable  Pooling and Servicing
    Agreement, which proceeds were received on  or after the Due Date  occurring
    in  the  month in  which  such Distribution  Date  occurs and  all principal
    prepayments in full, partial  principal prepayments and Partial  Liquidation
    Proceeds received by the related Servicer on or after the Determination Date
    (or,  in certain cases as specified in the applicable Prospectus Supplement,
    the Due Date) occurring in the month in which such Distribution Date occurs,
    and all related payments of interest on such amounts;
 
           (f)
           that portion  of Liquidation  Proceeds  which represents  any  unpaid
           Servicing  Fees, Master Servicing Fee or any Trustee Fee to which the
    related Servicer,  the  Trustee or  the  Master Servicer,  respectively,  is
    entitled and any unpaid Fixed Retained Yield;
 
           (g)
           if  an election has been made to treat the applicable Trust Estate as
           a  REMIC,  any   Net  Foreclosure  Profits   with  respect  to   such
    Distribution Date;
 
           (h)
           all  amounts representing certain expenses reimbursable to the Master
           Servicer or any Servicer and other amounts permitted to be  withdrawn
    by  the Master Servicer from the  Certificate Account, in each case pursuant
    to the applicable Pooling and Servicing Agreement;
 
           (i)
           all amounts in the nature  of late fees, assumption fees,  prepayment
           fees  and similar fees and payments  of interest related to principal
    prepayments received on  or after  the first  day of  the month  in which  a
    Distribution Date occurs and prior to the Determination Date in the month of
    such  Distribution Date  which the  related Servicer  is entitled  to retain
    pursuant to the applicable Underlying Servicing Agreement;
 
                                       34
<PAGE>
           (j)
           reinvestment earnings on payments received in respect of the Mortgage
           Loans; and
 
           (k)
           any  recovery  of  an  amount  in  respect  of  principal  which  had
           previously  been  allocated  as a  realized  loss to  such  Series of
    Certificates.
 
    The  applicable  Prospectus  Supplement  for  a  Series  will  describe  any
variation in the calculation of the Pool Distribution Amount for such Series.
 
    "Net  Foreclosure Profits" with  respect to a Distribution  Date will be the
excess of (i) the portion of aggregate net Liquidation Proceeds which represents
the amount by which aggregate profits on Liquidated Loans with respect to  which
net  Liquidation  Proceeds  exceed  the unpaid  principal  balance  thereof plus
accrued interest  thereon at  the  Mortgage Interest  Rate over  (ii)  aggregate
realized  losses  on  Liquidated Loans  with  respect to  which  net Liquidation
Proceeds are  less  than  the  unpaid principal  balance  thereof  plus  accrued
interest thereon at the Mortgage Interest Rate.
 
    DISTRIBUTIONS  OF INTEREST.   With respect  to each  Series of Certificates,
interest on the related Mortgage Loans at the weighted average of the applicable
Net Mortgage Interest Rates thereof, will  be passed through monthly to  holders
of  the related Classes of Certificates in the aggregate, in accordance with the
particular terms of each such Class of Certificates. The "Net Mortgage  Interest
Rate"  for each Mortgage Loan in a given period will equal the mortgage interest
rate for such Mortgage Loan in such period, as specified in the related mortgage
note (the  "Mortgage Interest  Rate"), less  the portion  thereof, if  any,  not
contained  in the  Trust Estate (the  "Fixed Retained Yield"),  and less amounts
payable to the Servicers for servicing the Mortgage Loan (the "Servicing  Fee"),
the  fee payable to  the Master Servicer  (the "Master Servicing  Fee"), the fee
payable to the Trustee (the "Trustee Fee") and any related expenses specified in
the applicable Prospectus.
 
    Interest will  accrue  on the  principal  balance (or  notional  amount,  as
described  below)  of each  Class of  Certificates entitled  to interest  at the
Pass-Through  Rate  for  such  Class  indicated  in  the  applicable  Prospectus
Supplement  (which may be a fixed rate or  an adjustable rate) from the date and
for the periods specified in such Prospectus Supplement. To the extent the  Pool
Distribution  Amount is  available therefor,  interest accrued  during each such
specified period on each Class of Certificates entitled to interest (other  than
a  Class that provides for interest that  accrues, but is not currently payable,
referred to hereafter as  "Accrual Certificates") will  be distributable on  the
Distribution  Dates specified in the  applicable Prospectus Supplement until the
principal balance (or notional amount) of  such Class has been reduced to  zero.
Distributions  allocable to interest on each Certificate that is not entitled to
distributions allocable to principal will  generally be calculated based on  the
notional  amount of such Certificate. The  notional amount of a Certificate will
not evidence  an  interest  in  or entitlement  to  distributions  allocable  to
principal  but will be  solely for convenience in  expressing the calculation of
interest and for certain other purposes.
 
    With respect to  any Class of  Accrual Certificates, any  interest that  has
accrued  but is  not paid  on a  given Distribution  Date will  be added  to the
principal balance  of such  Class  of Certificates  on that  Distribution  Date.
Distributions  of interest on  each Class of  Accrual Certificates will commence
only after the  occurrence of the  events or the  existence of the  circumstance
specified  in such  Prospectus Supplement  and, prior  to such  time, or  in the
absence of such circumstances, the principal balance of such Class will increase
on each Distribution Date by the amount  of interest that accrued on such  Class
during  the preceding interest  accrual period but  that was not  required to be
distributed to such Class on such  Distribution Date. Any such Class of  Accrual
Certificates  will  thereafter  accrue  interest  on  its  outstanding principal
balance as so adjusted.
 
    DISTRIBUTIONS  OF  PRINCIPAL.    The  principal  balance  of  any  Class  of
Certificates  entitled  to  distributions  of principal  will  generally  be the
original  principal  balance  of  such   Class  specified  in  such   Prospectus
Supplement,  reduced  by  all  distributions reported  to  the  holders  of such
Certificates as allocable to  principal and any losses  on the related  Mortgage
Loans  allocated to such  Class of Certificates  and (i) in  the case of Accrual
Certificates, increased by all  interest accrued but  not then distributable  on
such  Accrual Certificates  and (ii)  in the  case of  a Series  of Certificates
representing
 
                                       35
<PAGE>
interests in a Trust Estate containing adjustable rate Mortgage Loans, increased
by any Deferred  Interest allocable to  such Class. The  principal balance of  a
Class  or Subclass  of Certificates  generally represents  the maximum specified
dollar amount (exclusive of (i)  any interest that may  accrue on such Class  or
Subclass  to which  the holder  thereof is  entitled from  the cash  flow on the
related Mortgage  Loans  at  such  time)  and will  decline  to  the  extent  of
distributions  in  reduction of  the principal  balance  of, and  allocations of
losses to such Class  or Subclass. Certificates with  no principal balance  will
not  receive distributions  in respect  of principal.  The applicable Prospectus
Supplement will  specify the  method by  which  the amount  of principal  to  be
distributed on the Certificates on each Distribution Date will be calculated and
the  manner  in  which  such  amount will  be  allocated  among  the  Classes of
Certificates entitled to distributions of principal.
 
    If so provided in the applicable Prospectus Supplement, one or more  Classes
of  Senior Certificates  will be entitled  to receive all  or a disproportionate
percentage of the  payments of  principal that  are received  from borrowers  in
advance  of  their  scheduled  due  dates and  are  not  accompanied  by amounts
representing scheduled interest  due after  the months  of such  payments or  of
other  unscheduled principal receipts or recoveries in the percentages and under
the circumstances or for  the periods specified  in such Prospectus  Supplement.
Any  such allocation of  principal prepayments or  other unscheduled receipts or
recoveries  in  respect  of  principal  to  such  Class  or  Classes  of  Senior
Certificates  will  have the  effect of  accelerating  the amortization  of such
Senior Certificates while increasing the interests evidenced by the Subordinated
Certificates in the Trust Estate.  Increasing the interests of the  Subordinated
Certificates relative to that of the Senior Certificates is intended to preserve
the availability of the subordination provided by the Subordinated Certificates.
 
    If  specified in  the applicable  Prospectus Supplement,  the rights  of the
holders of the Subordinated Certificates of  a Series of Certificates for  which
credit  enhancement is  provided through subordination  to receive distributions
with respect  to  the  Mortgage  Loans  in the  related  Trust  Estate  will  be
subordinated  to such rights  of the holders  of the Senior  Certificates of the
same Series to the extent described below, except as otherwise set forth in such
Prospectus Supplement. This subordination is intended to enhance the  likelihood
of  regular receipt  by holders  of Senior  Certificates of  the full  amount of
scheduled monthly payments  of principal and  interest due them  and to  provide
limited  protection to the holders of the Senior Certificates against losses due
to mortgagor defaults.
 
    The protection afforded to the holders of Senior Certificates of a Series of
Certificates for which credit enhancement  is provided through subordination  by
the   subordination  feature  described  above  will  be  effected  by  (i)  the
preferential right of such holders to  receive, prior to any distribution  being
made  in respect of  the related Subordinated  Certificates on each Distribution
Date, current  distributions on  the  related Mortgage  Loans of  principal  and
interest  due them  on each  Distribution Date  out of  the funds  available for
distribution on such date in the related Certificate Account, (ii) by the  right
of such holders to receive future distributions on the Mortgage Loans that would
otherwise  have been payable to the  holders of Subordinated Certificates and/or
(iii) by  the prior  allocation to  the Subordinated  Certificates of  all or  a
portion of losses realized on the related Mortgage Loans.
 
    Losses  realized  on liquidated  Mortgage Loans  (other than  Excess Special
Hazard Losses, Excess  Fraud Losses  and Excess Bankruptcy  Losses as  described
below)  will be allocated to the  holders of Subordinated Certificates through a
reduction of the  amount of principal  payments on the  Mortgage Loans to  which
such  holders are entitled before any corresponding reduction is made in respect
of the Senior Certificate.
 
    A "Special Hazard Loss" is a loss on a liquidated Mortgage Loan occurring as
a result  of a  hazard not  insured against  under a  standard hazard  insurance
policy  of the type described herein under  "The Trust Estates -- Mortgage Loans
- -- Insurance Policies." A "Fraud Loss" is  a loss on a liquidated Mortgage  Loan
as  to  which  there was  fraud  in the  origination  of such  Mortgage  Loan. A
"Bankruptcy Loss"  is a  loss  on a  liquidated  Mortgage Loan  attributable  to
certain  actions which may be  taken by a bankruptcy  court in connection with a
Mortgage Loan, including  a reduction  by a  bankruptcy court  of the  principal
balance  of or  the interest  rate on  a Mortgage  Loan or  an extension  of its
maturity. Special
 
                                       36
<PAGE>
Hazard Losses in  excess of the  amount specified in  the applicable  Prospectus
Supplement  (the  "Special  Hazard  Loss  Amount")  are  "Excess  Special Hazard
Losses." Fraud  Losses in  excess  of the  amount  specified in  the  applicable
Prospectus  Supplement  (the "Fraud  Loss  Amount") are  "Excess  Fraud Losses."
Bankruptcy losses in excess of the amount specified in the applicable Prospectus
Supplement (the "Bankruptcy  Loss Amount") are  "Excess Bankruptcy Losses."  Any
Excess  Special Hazard Losses,  Excess Fraud Losses  or Excess Bankruptcy Losses
with respect to a Series will be allocated on a pro rata basis among the related
Classes of Senior and  Subordinated Certificates. An allocation  of a loss on  a
"pro  rata basis" among two or more  Classes of Certificates means an allocation
on a pro rata  basis to each such  Class of Certificates on  the basis of  their
then-outstanding  principal balances in  the case of the  principal portion of a
loss or based on the accrued interest thereon in the case of an interest portion
of a loss.
 
    Since the amounts of the Special  Hazard Loss Amount, Fraud Loss Amount  and
Bankruptcy Loss Amount for a Series of Certificates are each expected to be less
than the amount of principal payments on the Mortgage Loans to which the holders
of  the Subordinated  Certificates of such  Series are  initially entitled (such
amount being subject to reduction, as described above, as a result of allocation
of losses on liquidated Mortgage Loans that are not Special Hazard Losses, Fraud
Losses or Bankruptcy Losses), the  holders of Subordinated Certificates of  such
Series  will bear the risk of Special Hazard Losses, Fraud Losses and Bankruptcy
Losses to  a  lesser extent  than  they will  bear  other losses  on  liquidated
Mortgage Loans.
 
    Although  the subordination feature  described above is  intended to enhance
the likelihood of  timely payment of  principal and interest  to the holders  of
Senior  Certificates,  shortfalls  could result  in  certain  circumstances. For
example, a shortfall in  the payment of principal  otherwise due the holders  of
Senior  Certificates could occur if  losses realized on the  Mortgage Loans in a
Trust Estate  were exceptionally  high  and were  concentrated in  a  particular
month.
 
    The  holders of Subordinated Certificates will not be required to refund any
amounts previously properly distributed to them, regardless of whether there are
sufficient funds on a subsequent Distribution  Date to make a full  distribution
to holders of each Class of Senior Certificates of the same Series.
 
OTHER CREDIT ENHANCEMENT
 
    In  addition to, or in substitution  for, the subordination discussed above,
credit enhancement may be provided with respect to any Series of Certificates in
any other manner which may be described in the applicable Prospectus Supplement,
including, but not limited to, credit enhancement through an alternative form of
subordination and/or one or more of the methods described below.
 
    LIMITED GUARANTEE
 
    If so specified  in the Prospectus  Supplement with respect  to a Series  of
Certificates,  credit  enhancement may  be  provided in  the  form of  a limited
guarantee issued by a guarantor named therein.
 
    FINANCIAL GUARANTY INSURANCE POLICY OR SURETY BOND
 
    If so specified  in the Prospectus  Supplement with respect  to a Series  of
Certificates  credit  enhancement may  be provided  in the  form of  a financial
guaranty insurance policy or a surety bond issued by an insurer named therein.
 
    LETTER OF CREDIT
 
    Alternative credit support with respect to  a Series of Certificates may  be
provided  by  the  issuance of  a  letter of  credit  by the  bank  or financial
institution specified  in the  applicable Prospectus  Supplement. The  coverage,
amount and frequency of any reduction in coverage provided by a letter of credit
issued  with  respect to  a  Series of  Certificates will  be  set forth  in the
Prospectus Supplement relating to such Series.
 
                                       37
<PAGE>
    POOL INSURANCE POLICIES
 
    If so  specified  in the  Prospectus  Supplement  relating to  a  Series  of
Certificates,  the Seller will  obtain a pool insurance  policy for the Mortgage
Loans in the related Trust Estate. The pool insurance policy will cover any loss
(subject to the limitations described  in the applicable Prospectus  Supplement)
by reason of default to the extent a related Mortgage Loan is not covered by any
primary  mortgage insurance policy.  The amount and principal  terms of any such
coverage will be set forth in the Prospectus Supplement.
 
    SPECIAL HAZARD INSURANCE POLICIES
 
    If so specified in the applicable Prospectus Supplement, for each Series  of
Certificates  as to which a  pool insurance policy is  provided, the Seller will
also obtain a special  hazard insurance policy for  the related Trust Estate  in
the amount set forth in such Prospectus Supplement. The special hazard insurance
policy  will, subject to the limitations  described in the applicable Prospectus
Supplement, protect against  loss by  reason of damage  to Mortgaged  Properties
caused  by certain hazards not insured against under the standard form of hazard
insurance policy for the respective states in which the Mortgaged Properties are
located. The amount and principal terms of  any such coverage will be set  forth
in the Prospectus Supplement.
 
    MORTGAGOR BANKRUPTCY BOND
 
    If  so specified in  the applicable Prospectus  Supplement, losses resulting
from a  bankruptcy proceeding  relating to  a mortgagor  affecting the  Mortgage
Loans in a Trust Estate with respect to a Series of Certificates will be covered
under  a mortgagor bankruptcy bond (or any other instrument that will not result
in a downgrading of  the rating of  the Certificates of a  Series by the  Rating
Agency or Rating Agencies that rated such Series). Any mortgagor bankruptcy bond
or  such other  instrument will  provide for coverage  in an  amount meeting the
criteria of the Rating Agency or Rating Agencies rating the Certificates of  the
related  Series, which  amount will  be set  forth in  the applicable Prospectus
Supplement. The amount  and principal  terms of any  such coverage  will be  set
forth in the Prospectus Supplement.
 
    RESERVE FUND
 
    If  so specified in the applicable Prospectus Supplement, credit enhancement
with respect to a Series of Certificates may be provided by the establishment of
one or more reserve funds (each, a "Reserve Fund") for such Series.
 
    The Reserve Fund for a  Series may be funded (i)  by the deposit therein  of
cash,  U.S. Treasury securities or instruments evidencing ownership of principal
or interest payments thereon, letters  of credit, demand notes, certificates  of
deposit  or  a combination  thereof  in the  aggregate  amount specified  in the
applicable Prospectus Supplement, (ii) by the deposit therein from time to  time
of  certain amounts,  as specified in  the applicable  Prospectus Supplement, to
which the certain Classes of Certificates  would otherwise be entitled or  (iii)
in  such  other  manner  as  may  be  specified  in  the  applicable  Prospectus
Supplement.
 
    CROSS SUPPORT
 
    If  specified  in  the  applicable  Prospectus  Supplement,  the  beneficial
ownership of separate groups of Mortgage Loans included in a Trust Estate may be
evidenced  by separate Classes of Certificates. In such case, credit support may
be provided by a cross support feature which requires that distributions be made
with respect to certain Classes from mortgage loan payments that would otherwise
be distributed to  Subordinated Certificates evidencing  a beneficial  ownership
interest  in  other loan  groups within  the same  Trust Estate.  The applicable
Prospectus Supplement for a  Series that includes a  cross support feature  will
describe the specific operation of any such cross support feature.
 
                                       38
<PAGE>
                      PREPAYMENT AND YIELD CONSIDERATIONS
 
PASS-THROUGH RATES
 
    Any Class of Certificates of a Series may have a fixed Pass-Through Rate, or
a  Pass-Through  Rate which  varies based  on changes  in an  index or  based on
changes with respect  to the underlying  Mortgage Loans (such  as, for  example,
varying  on the basis of  changes in the weighted  average Net Mortgage Interest
Rate of the underlying Mortgage Loans).
 
    The Prospectus Supplement  for each Series  will specify the  range and  the
weighted average of the Mortgage Interest Rates and, if applicable, Net Mortgage
Interest  Rates for the Mortgage Loans underlying  such Series as of the Cut-Off
Date. If the Trust  Estate includes adjustable-rate  Mortgage Loans or  includes
Mortgage  Loans with different Net Mortgage Interest Rates, the weighted average
Net Mortgage Interest Rate may  vary from time to time  as set forth below.  See
"The  Trust Estates." The  Prospectus Supplement for a  Series will also specify
the initial weighted average Pass-Through Rate for each Class of Certificates of
such Series and will specify whether each such Pass-Through Rate is fixed or  is
variable.
 
    The  Net Mortgage Interest  Rate for any  adjustable-rate Mortgage Loan will
change with any  changes in  the index  specified in  the applicable  Prospectus
Supplement  on which such Mortgage Interest  Rate adjustments are based, subject
to any applicable periodic or aggregate  caps or floors on the related  Mortgage
Interest  Rate. The weighted average Net  Mortgage Interest Rate with respect to
any Series  may vary  due  to changes  in the  Net  Mortgage Interest  Rates  of
adjustable-rate  Mortgage Loans,  to the  timing of  the Mortgage  Interest Rate
readjustments of  such Mortgage  Loans  and to  different  rates of  payment  of
principal  of fixed or adjustable-rate Mortgage Loans bearing different Mortgage
Interest Rates.
 
SCHEDULED DELAYS IN DISTRIBUTIONS
 
    At the date of initial issuance  of the Certificates of each Series  offered
hereby, the initial purchasers of a Class of Certificates may be required to pay
accrued  interest at  the applicable Pass-Through  Rate for such  Class from the
Cut-Off Date for such Series  to, but not including,  the date of issuance.  The
effective yield to Certificateholders will be below the yield otherwise produced
by  the applicable Pass-Through  Rate because the  distribution of principal and
interest which is due on each Due Date  will not be made until the 25th day  (or
if  such 25th day is not a  business day, the business day immediately following
such 25th day) of the month in which  such Due Date occurs (or until such  other
Distribution Date specified in the applicable Prospectus Supplement).
 
EFFECT OF PRINCIPAL PREPAYMENTS
 
    When  a Mortgage Loan is prepaid in full, the mortgagor pays interest on the
amount prepaid only to  the date of prepayment  and not thereafter.  Liquidation
Proceeds  (as defined  herein) and amounts  received in  settlement of insurance
claims are  also likely  to include  interest only  to the  time of  payment  or
settlement.  When a  Mortgage Loan is  prepaid in  full or in  part, an interest
shortfall may result depending  on the timing of  the receipt of the  prepayment
and   the   timing   of   when  those   prepayments   are   passed   through  to
Certificateholders.  To  partially  mitigate   this  reduction  in  yield,   the
Underlying  Servicing Agreements relating to a Series may provide, to the extent
specified in the applicable Prospectus Supplement, that with respect to  certain
principal  prepayments received on or, the Master Servicer will be obligated, on
or before each Distribution Date,  to pay an amount equal  to the lesser of  (i)
the  aggregate  interest  shortfall  with  respect  to  such  Distribution  Date
resulting from principal prepayments in full by mortgagors and (ii) the  portion
of  the Master  Servicer's master  servicing compensation  for such Distribution
Date specified in the applicable  Prospectus Supplement. No comparable  interest
shortfall  coverage  will be  provided by  the Master  Servicer with  respect to
liquidations of any Mortgage Loans  or partial principal payments. Any  interest
shortfall  arising from prepayments not so  covered or from liquidations will be
covered  by  means  of   the  subordination  of   the  rights  of   Subordinated
Certificateholders or any other credit support arrangements.
 
                                       39
<PAGE>
    A  lower  rate of  principal prepayments  than anticipated  would negatively
affect the total return to  investors in any Certificates  of a Series that  are
offered  at a discount to their principal  amount and a higher rate of principal
prepayments than  anticipated  would  negatively  affect  the  total  return  to
investors in the Certificates of a Series that are offered at a premium to their
principal  amount.  The  yield  on  Certificates  that  are  entitled  solely or
disproportionately to distributions of principal or interest may be particularly
sensitive to prepayment rates, and further information with respect to yield  on
such Certificates will be included in the applicable Prospectus Supplement.
 
WEIGHTED AVERAGE LIFE OF CERTIFICATES
 
    The  Mortgage Loans may be prepaid in full  or in part at any time. Mortgage
Loan generally will not provide for a  prepayment penalty but may so provide  if
indicated  in  the  related  Prospectus Supplement.  Fixed  rate  Mortgage Loans
generally  will  contain  due-on-sale   clauses  permitting  the  mortgagee   to
accelerate  the maturities of the Mortgage  Loans upon conveyance of the related
Mortgaged Properties, and adjustable-rate  Mortgage Loans generally will  permit
creditworthy  borrowers  to  assume  the  then-outstanding  indebtedness  on the
Mortgage Loans.
 
    Prepayments on Mortgage Loans are commonly measured relative to a prepayment
standard or model. The Prospectus Supplement for each Series of Certificates may
describe one or  more such  prepayment standards  or models  and contain  tables
setting  forth the weighted average life of each Class and the percentage of the
original aggregate principal balance of each Class that would be outstanding  on
specified  Distribution  Dates  for  such Series  and  the  projected  yields to
maturity on  certain Classes  thereof, in  each case  based on  the  assumptions
stated  in such Prospectus Supplement, including assumptions that prepayments on
the Mortgage Loans are made at rates corresponding to various percentages of the
prepayment standard or model specified in such Prospectus Supplement.
 
    There is no  assurance that prepayment  of the Mortgage  Loans underlying  a
Series  of Certificates will conform to any  level of the prepayment standard or
model specified in the  applicable Prospectus Supplement.  A number of  factors,
including  but not limited  to homeowner mobility,  economic conditions, natural
disasters, changes in mortgagors' housing needs, job transfers, unemployment or,
in the  case  of  borrowers  relying  on  commission  income  and  self-employed
borrowers,  significant fluctuations  in income or  adverse economic conditions,
mortgagors' net equity in the  properties securing the mortgages, including  the
use  of second or "home  equity" mortgage loans by mortgagors  or the use of the
properties as second or vacation  homes, servicing decisions, enforceability  of
due-on-sale  clauses, mortgage market interest  rates, mortgage recording taxes,
competition among  mortgage loan  originators resulting  in reduced  refinancing
costs,  reduction in documentation requirements and willingness to accept higher
loan-to-value ratios,  and  the  availability  of  mortgage  funds,  may  affect
prepayment  experience. In general,  however, if prevailing  interest rates fall
below the  Mortgage Interest  Rates borne  by the  Mortgage Loans  underlying  a
Series  of Certificates, the prepayment rates  of such Mortgage Loans are likely
to be higher than if prevailing rates remain at or above the rates borne by such
Mortgage Loans. Conversely, if prevailing interest rates rise above the Mortgage
Interest Rates borne  by the Mortgage  Loans, the Mortgage  Loans are likely  to
experience  a lower prepayment rate than if  prevailing rates remain at or below
such  Mortgage  Interest  Rates.  However,  there  can  be  no  assurance   that
prepayments  will rise or fall  according to such changes  in interest rates. It
should be noted  that Certificates of  a Series  may evidence an  interest in  a
Trust Estate with different Mortgage Interest Rates. Accordingly, the prepayment
experience  of such Certificates will to some extent be a function of the mix of
interest rates of the Mortgage Loans.  In addition, the terms of the  Underlying
Servicing   Agreements  will  require  the   related  Servicer  to  enforce  any
due-on-sale clause  to the  extent it  has knowledge  of the  conveyance or  the
proposed  conveyance of  the underlying  Mortgaged Property;  provided, however,
that any enforcement action  that the Servicer  determines would jeopardize  any
recovery  under  any  related  primary mortgage  insurance  policy  will  not be
required and provided, further, that the  Servicer may permit the assumption  of
defaulted Mortgage Loans. See "Servicing of the Mortgage Loans -- Enforcement of
Due-on-Sale Clauses; Realization Upon Defaulted Mortgage
 
                                       40
<PAGE>
Loans"  and "Certain Legal Aspects of the Mortgage Loans -- Due-On-Sale Clauses"
for a description of certain provisions of each Pooling and Servicing  Agreement
and  certain legal developments that may affect the prepayment experience on the
Mortgage Loans.
 
    At the request of the mortgagor, a Servicer, including Norwest Mortgage, may
allow the refinancing of a  Mortgage Loan in any  Trust Estate serviced by  such
Servicer by accepting prepayments thereon and permitting a new loan secured by a
Mortgage  on the same property. Upon such  refinancing, the new loan will not be
included in the Trust Estate. A mortgagor may be legally entitled to require the
Servicer to allow such  a refinancing. Any such  refinancing will have the  same
effect  as a prepayment in  full of the related Mortgage  Loan. In this regard a
Servicer may,  from  time to  time,  implement programs  designed  to  encourage
refinancing  through  such Servicer,  including but  not  limited to  general or
targeted solicitations, or  the offering of  pre-approved applications,  reduced
origination fees or closing costs, or other financial incentives. A Servicer may
also encourage refinancing of defaulted Mortgage Loans, including Mortgage Loans
that would permit creditworthy borrowers to assume the outstanding indebtedness.
 
    The  Seller will  be obligated,  under certain  circumstances, to repurchase
certain of  the Mortgage  Loans. In  addition, if  specified in  the  applicable
Prospectus  Supplement, the Pooling and Servicing Agreement will permit, but not
require, the  Seller or  Master Servicer,  and the  terms of  certain  insurance
policies  relating to the  Mortgage Loans may permit  the applicable insurer, to
purchase any  Mortgage Loan  which  is in  default or  as  to which  default  is
reasonably  foreseeable. The proceeds of any such purchase or repurchase will be
deposited in the  related Certificate  Account and such  purchase or  repurchase
will  have the same effect as a prepayment in full of the related Mortgage Loan.
See "The Pooling and Servicing Agreement -- Assignment of Mortgage Loans to  the
Trustee"  and "  -- Optional  Purchases." In  addition, if  so specified  in the
applicable  Prospectus  Supplement,  the  Master  Servicer  or  another   person
identified  therein will have the option to purchase all, but not less than all,
of the Mortgage Loans in any Trust Estate under the limited conditions specified
in such  Prospectus Supplement.  For any  Series of  Certificates for  which  an
election  has been  made to treat  the Trust  Estate (or one  or more segregated
pools of assets  therein) as a  REMIC, any  such purchase or  repurchase may  be
effected  only pursuant to a "qualified liquidation," as defined in Code Section
860F(a)(4)(A). See "The Pooling and Servicing Agreement -- Termination; Optional
Purchase of Mortgage Loans."
 
                        SERVICING OF THE MORTGAGE LOANS
 
    The following  is  a summary  of  certain provisions  of  the forms  of  the
Underlying Servicing Agreement and the Pooling and Servicing Agreement that have
been  filed as exhibits  to the Registration Statement  of which this Prospectus
forms a part. The summaries  do not purport to be  complete and are subject  to,
and  are qualified in their  entirety by reference to,  all of the provisions of
the Pooling and Servicing Agreement and Underlying Servicing Agreements for each
Series of Certificates and the applicable Prospectus Supplement.
 
THE MASTER SERVICER
 
    The Master Servicer  with respect  to each  Series of  Certificates will  be
Norwest  Bank. See "Norwest Bank" above.  The Master Servicer generally will (a)
be responsible under each Pooling and Servicing Agreement for providing  general
administrative  services for  the Trust Estate  for any  such Series, including,
among other things, (i) for administering and supervising the performance by the
Servicers of their  duties and responsibilities  under the Underlying  Servicing
Agreements,  (ii)  oversight  of  payments  received  on  Mortgage  Loans, (iii)
monitoring the amounts on deposit in various trust accounts, (iv) calculation of
the amounts  payable  to  Certificateholders  on  each  Distribution  Date,  (v)
preparation  of periodic reports  to the Trustee  or the Certificateholders with
respect to the  foregoing matters,  (vi) preparation of  federal and  applicable
state  and local tax  and information returns; (vii)  preparation of reports, if
any,  required   under   the  Securities   and   Exchange  Act   of   1934,   as
 
                                       41
<PAGE>
amended  and  (viii)  performing  certain  of  the  servicing  obligations  of a
terminated Servicer as described  below under "--  The Servicers"; (b)  maintain
any  mortgage pool insurance  policy, mortgagor bankruptcy  bond, special hazard
insurance policy  or other  form of  credit support  that may  be required  with
respect  to any Series and (c) make advances of delinquent payments of principal
and interest on the Mortgage Loans to the limited extent described herein  under
the  heading "Servicing of  Mortgage Loans --  Periodic Advances and Limitations
Thereon," if such  amounts are not  advanced by a  Servicer (other than  Norwest
Mortgage).  The Master Servicer will also perform additional duties as described
in the applicable Pooling and Servicing  Agreement. The Master Servicer will  be
entitled  to receive a  portion of the  interest payments on  the Mortgage Loans
included in the  Trust Estate  for such  a Series to  cover its  fees as  Master
Servicer. The Master Servicer may subcontract with Norwest Mortgage or any other
entity  the obligations of  the Master Servicer under  any Pooling and Servicing
Agreement. The  Master  Servicer  will  remain primarily  liable  for  any  such
contractor's performance in accordance with the applicable Pooling and Servicing
Agreement.  The Master Servicer may be  released from its obligations in certain
circumstances. See "Certain Matters Regarding the Master Servicer."
 
    The Master Servicer will generally be required to pay all expenses  incurred
in  connection with the  administration of the  Trust Estate, including, without
limitation, fees or other amounts  payable pursuant to any applicable  agreement
for  the  provision  of  credit  enhancement  for  such  Series,  the  fees  and
disbursements of the  Trustee and  any custodian,  fees due  to the  independent
accountants  and expenses incurred in  connection with distributions and reports
to Certificateholders.  Certain of  these expenses  may be  reimbursable to  the
Master  Servicer pursuant to  the terms of the  applicable Pooling and Servicing
Agreement.
 
    Each Prospectus Supplement relating  to such a  Series of Certificates  will
contain  information concerning  recent delinquency,  foreclosure and  loan loss
experience on  the  mortgage  loans included  in  Norwest  Mortgage's  servicing
portfolio  which were  originated or  acquired by  Norwest Mortgage  for its own
account or  for  the  account  of its  affiliates  ("Program  Loans"),  and,  if
available,  on those  Program Loans  having payment  terms generally  similar to
those of the Mortgage Loans  in the related Trust  Estate. If the related  Trust
Estate  contains  PHMC Mortgage  Loans,  the related  Prospectus  Supplement may
contain information concerning  PHMC's delinquency, foreclosure  and loans  loss
experience  prior to  the PHMC  Acquisition. Norwest  Mortgage's total servicing
portfolio of Program  Loans as  of any date  may include  (and PHMC's  servicing
portfolio included) loans having a variety of payment characteristics, including
adjustable  rate mortgage loans and loans subject to subsidy agreements, and the
overall delinquency, foreclosure and loan  loss experience of the Program  Loans
(or  PHMC-serviced mortgage loans) taken as a  whole may differ from that of the
Mortgage Loans contained  in any given  Trust Estate and  from that of  mortgage
servicers generally.
 
THE SERVICERS
 
    For  each  Series,  Norwest Mortgage  and,  if specified  in  the applicable
Prospectus  Supplement,  one  or  more  other  Servicers  will  provide  certain
customary  servicing  functions  with  respect  to  Mortgage  Loans  pursuant to
separate servicing  agreements  ("Underlying  Servicing  Agreements")  with  the
Seller or an affiliate thereof. The rights of the Seller or such affiliate under
the  applicable Underlying Servicing Agreements in respect of the Mortgage Loans
included in the Trust Estate for any  such Series will be assigned (directly  or
indirectly)  to the Trustee  for such Series.  The Servicers may  be entitled to
withhold  their  Servicing  Fees  and  certain  other  fees  and  charges   from
remittances of payments received on Mortgage Loans serviced by them.
 
    Each  Servicer generally will be approved by  FNMA or FHLMC as a servicer of
mortgage loans  and must  be approved  by the  Master Servicer.  In  determining
whether to approve a Servicer, the Master Servicer will review the credit of the
Servicer,  including capitalization  ratios, liquidity,  profitability and other
similar items that  indicate financial  ability to perform  its obligations.  In
addition, the
 
                                       42
<PAGE>
Master  Servicer's  mortgage  servicing  personnel  will  review  the Servicer's
servicing record  and evaluate  the  ability of  the  Servicer to  conform  with
required  servicing procedures. Once a Servicer is approved, the Master Servicer
will continue to monitor on an annual basis the financial position and servicing
performance of the Servicer.
 
    The  duties  to  be  performed  by  each  Servicer  include  collection  and
remittance   of  principal  and   interest  payments  on   the  Mortgage  Loans,
administration of  mortgage escrow  accounts,  collection of  insurance  claims,
foreclosure  procedures, and, if  necessary, the advance of  funds to the extent
certain payments are not made by the  mortgagor and have not been determined  by
the  Servicer to be not recoverable under the applicable insurance policies with
respect to such Series, from proceeds  of liquidation of such Mortgage Loans  or
otherwise.  Each  Servicer  also  will  provide  such  accounting  and reporting
services as are  necessary to  enable the  Master Servicer  to provide  required
information  to the Trustee with  respect to the Mortgage  Loans included in the
Trust Estate for such Series. Each Servicer is entitled to a periodic  Servicing
Fee equal to a specified percentage of the outstanding principal balance of each
Mortgage  Loan  serviced  by  such  Servicer. With  the  consent  of  the Master
Servicer, any of  the servicing obligations  of a Servicer  may be delegated  to
another  person approved  by the Master  Servicer. In  addition, certain limited
duties of a Servicer may be delegated without consent.
 
    The Trustee, or if  so provided in the  applicable Servicing Agreement,  the
Master  Servicer, may  terminate a  Servicer who has  failed to  comply with its
covenants or breached  one of  its representations contained  in the  Underlying
Servicing  Agreement or  in certain other  circumstances. Upon  termination of a
Servicer by  the  Master  Servicer,  the Master  Servicer  will  assume  certain
servicing obligations of the terminated Servicer, or, at its option, may appoint
a  substitute Servicer acceptable to the  Trustee (which substitute Servicer may
be Norwest  Mortgage) to  assume  the servicing  obligations of  the  terminated
Servicer.  The Master Servicer's obligations to  act as a servicer following the
termination of an Underlying Servicing Agreement will not, however, require  the
Master  Servicer to (i) purchase a Mortgage Loan  from the Trust Estate due to a
breach by  such Servicer  of a  representation or  warranty in  respect of  such
Mortgage Loan or (ii) with respect to a default by Norwest Mortgage as Servicer,
advance payments of principal and interest on a delinquent Mortgage Loan.
 
PAYMENTS ON MORTGAGE LOANS
 
    The  Master Servicer will, as to  each Series of Certificates, establish and
maintain a separate trust account in  the name of the Trustee (the  "Certificate
Account").  Such  account may  be established  at Norwest  Bank or  an affiliate
thereof. Each  such account  must be  maintained with  a depository  institution
("Depository") either (i) 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) are, at the time  of
any  deposit therein rated in at least  one of the two highest rating categories
by each nationally  recognized statistical  rating organization  that rated  the
related  Series of  Certificates, or  (ii) that  is otherwise  acceptable to the
Rating Agency or Rating Agencies rating the Certificates of such Series and,  if
a  REMIC election has been  made, that would not  cause the related Trust Estate
(or one or  more segregated pools  of assets therein)  to fail to  qualify as  a
REMIC.  To the  extent that  the portion of  funds deposited  in the Certificate
Account at any time exceeds the  limit of insurance coverage established by  the
Federal  Deposit Insurance Corporation (the "FDIC"), such excess will be subject
to loss in the event of the  failure of the Depository. Such insurance  coverage
will  be based on the number of  holders of Certificates, rather than the number
of underlying mortgagors. Holders of  the Subordinated Certificates of a  Series
will  bear any such loss  up to the amount of  principal payments on the related
Mortgage Loans to which such holders are entitled.
 
    Pursuant to the applicable Underlying Servicing Agreements with respect to a
Series, each Servicer  will be required  to establish and  maintain one or  more
accounts  (collectively,  the  "Servicer  Custodial  Account")  into  which  the
Servicer will be  required to  deposit on a  daily basis  amounts received  with
respect to Mortgage Loans serviced by such Servicer included in the Trust Estate
for  such Series, as more fully described below. Each Servicer Custodial Account
must be a separate custodial account insured to the available limits by the FDIC
and limited  to funds  held with  respect  to a  particular Series,  unless  the
Underlying   Servicing  Agreement  specifies  that   a  Servicer  may  establish
 
                                       43
<PAGE>
an account  which  is  an  eligible account  meeting  the  requirements  of  the
applicable  Rating  Agencies (an  "Eligible Custodial  Account")  to serve  as a
unitary Servicer Custodial Account both for such Series and for other Series  of
Certificates  for which Norwest Bank is the  Master Servicer and having the same
financial institution acting as Trustee and to be maintained in the name of such
financial institution, in  its respective  capacities as Trustee  for each  such
Series.
 
    Each  Servicer will  be required to  deposit in the  Certificate Account for
each Series of Certificates on the date the Certificates are issued any  amounts
representing  scheduled payments of principal and interest on the Mortgage Loans
serviced by such Servicer due after the applicable Cut-Off Date but received  on
or  prior  thereto,  and  except  as specified  in  the  applicable  Pooling and
Servicing Agreement  or  Underlying Servicing  Agreement,  will deposit  in  the
Servicer  Custodial Account on receipt and,  thereafter, not later than the 24th
calendar day  of each  month or  such earlier  day as  may be  specified in  the
Underlying Servicing Agreement (the "Remittance Date"), will remit to the Master
Servicer  for deposit  in the  Certificate Account,  the following  payments and
collections received or made by such Servicer with respect to the Mortgage Loans
serviced by such Servicer subsequent to the applicable Cut-Off Date (other  than
(x)  payments due on or before the Cut-Off  Date and (y) amounts held for future
distribution):
 
           (i)
           all payments  on account  of  principal, including  prepayments,  and
           interest;
 
          (ii)
           all   amounts  received  by  the  Servicer  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 defaulted  Mortgage  Loans received  from  the
    mortgagor  other than amounts required to  be paid to the mortgagor pursuant
    to the terms of  the applicable Mortgage Loan  or otherwise pursuant to  law
    ("Liquidation  Proceeds") less, to the extent permitted under the applicable
    Underlying Servicing  Agreement,  the amount  of  any expenses  incurred  in
    connection with the liquidation of such Mortgage Loans;
 
         (iii)
           all  proceeds received  by the  Servicer under  any title,  hazard or
           other insurance policy  covering any such  Mortgage Loan, other  than
    proceeds  to be applied to the restoration or repair of the property subject
    to the related Mortgage or released to the mortgagor in accordance with  the
    Underlying Servicing Agreement;
 
          (iv)
           all Periodic Advances made by the Servicer;
 
           (v)
           all  amounts withdrawn from Buy-Down Funds  or Subsidy Funds, if any,
           with respect to such Mortgage Loans, in accordance with the terms  of
    the respective agreements applicable thereto;
 
          (vi)
           all  proceeds  of any  such Mortgage  Loans  or property  acquired in
           respect thereof purchased or repurchased pursuant to the Pooling  and
    Servicing Agreement or the Underlying Servicing Agreement; and
 
         (vii)
           all  other amounts required  to be deposited  therein pursuant to the
           applicable  Pooling  and  Servicing   Agreement  or  the   Underlying
    Servicing Agreement.
 
    Notwithstanding  the foregoing, if at any time  the sums in (x) any Servicer
Custodial Account, other than any Eligible Custodial Account, exceed $100,000 or
(y) any such Servicer Custodial  Account, in certain circumstances, exceed  such
amount  less than $100,000 as shall have  been specified by the Master Servicer,
the Servicer will be  required within one business  day to withdraw such  excess
funds from such account and remit such amounts to the Certificate Account.
 
    Notwithstanding  the  foregoing,  each  Servicer will  be  entitled,  at its
election, either (a)  to withhold and  pay itself the  applicable Servicing  Fee
from  any payment or other recovery on account of interest as received and prior
to deposit  in  the Servicer  Custodial  Account or  (b)  to withdraw  from  the
Servicer Custodial Account the applicable Servicing Fee after the entire payment
or recovery has been deposited in such account.
 
                                       44
<PAGE>
    The  Master Servicer or Trustee will  deposit in the Certificate Account any
Periodic Advances made  by the  Master Servicer  or Trustee  in the  event of  a
Servicer  default not later than the Distribution Date on which such amounts are
required to  be  distributed.  All  other  amounts  will  be  deposited  in  the
Certificate  Account not later than  the business day next  following the day of
receipt and posting by the Master Servicer. On or before each Distribution Date,
the Master Servicer will withdraw from the Certificate Account and remit to  the
Trustee for distribution to Certificateholders all amounts allocable to the Pool
Distribution Amount for such Distribution Date.
 
    If  a  Servicer,  the  Master  Servicer  or  the  Trustee  deposits  in  the
Certificate Account  for  a Series  any  amount  not required  to  be  deposited
therein,  the Master  Servicer may  at any time  withdraw such  amount from such
account for  itself  or for  remittance  to such  Servicer  or the  Trustee,  as
applicable.  Funds  on deposit  in the  Certificate Account  may be  invested in
certain investments acceptable to  the Rating Agencies ("Eligible  Investments")
maturing  in  general  not  later  than  the  business  day  preceding  the next
Distribution Date. In  the event that  an election  has been made  to treat  the
Trust Estate (or one or more segregated pools of assets therein) with respect to
a Series as a REMIC, 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 (or segregated pool  of assets) to be subject to the
tax on "prohibited transactions" imposed  by Code Section 860F(a)(1),  otherwise
subject  the Trust Estate  (or segregated pool  of assets) to  tax, or cause the
Trust Estate (or any segregated  pool of assets) to fail  to qualify as a  REMIC
while  any  Certificates  of the  Series  are outstanding.  Except  as otherwise
specified in the applicable Prospectus Supplement, all income and gain  realized
from  any such  investment will  be for  the account  of the  Master Servicer as
additional compensation  and  all  losses  from  any  such  investment  will  be
deposited by the Master Servicer out of its own funds to the Certificate Account
immediately as realized.
 
    The  Master Servicer  is permitted, from  time to time,  to make withdrawals
from the Certificate Account for the following purposes, to the extent permitted
in the applicable Pooling and Servicing Agreement (and, in the case of  Servicer
reimbursements  by  the  Master  Servicer,  only  to  the  extent  funds  in the
respective Servicer Custodial Account are not sufficient therefor):
 
           (i)
           to reimburse the  Master Servicer,  the Trustee or  any Servicer  for
           Advances;
 
          (ii)
           to  reimburse any Servicer  for liquidation expenses  and for amounts
           expended by itself or any Servicer, as applicable, in connection with
    the restoration of damaged property;
 
         (iii)
           to pay to itself  the applicable Master Servicing  Fee and any  other
           amounts constituting additional master servicing compensation, to pay
    the  Trustee the applicable Trustee Fee, to  pay any other fees described in
    the applicable Prospectus Supplement;  and to pay to  the owner thereof  any
    Fixed Retained Yield;
 
          (iv)
           to  reimburse itself or any  Servicer for certain expenses (including
           taxes paid on behalf of the Trust Estate) incurred by and recoverable
    by or reimbursable to itself or the Servicer, as applicable;
 
           (v)
           to pay  to the  Seller, a  Servicer or  itself with  respect to  each
           Mortgage  Loan or property acquired in  respect thereof that has been
    repurchased by the Seller or purchased by a Servicer or the Master  Servicer
    all  amounts received thereon and not distributed as of the date as of which
    the purchase price of such Mortgage Loan was determined;
 
          (vi)
           to pay to itself any interest  earned on or investment income  earned
           with  respect to funds in the  Certificate Account (all such interest
    or income to be withdrawn not later than the next Distribution Date);
 
                                       45
<PAGE>
         (vii)
           to pay to itself, the Servicer  and the Trustee from net  Liquidation
           Proceeds  allocable  to interest,  the  amount of  any  unpaid Master
    Servicing Fee,  Servicing Fees  or Trustee  Fees and  any unpaid  assumption
    fees,  late  payment  charges  or other  mortgagor  charges  on  the related
    Mortgage Loan;
 
        (viii)
           to withdraw from the Certificate Account any amount deposited in such
           account that was not required to be deposited therein; and
 
          (ix)
           to clear and terminate the Certificate Account.
 
    The Master  Servicer will  be  authorized to  appoint  a paying  agent  (the
"Paying  Agent") to  make distributions,  as agent  for the  Master Servicer, to
Certificateholders of a Series. If the Paying Agent for a Series is the  Trustee
of  such Series, such Paying  Agent will be authorized  to make withdrawals from
the Certificate Account in order to make distributions to Certificateholders. If
the Paying Agent for  a Series is  not the Trustee for  such Series, the  Master
Servicer will, on each Distribution Date, deposit in immediately available funds
in  an account  designated by any  such Paying  Agent the amount  required to be
distributed to the Certificateholders on such Distribution Date.
 
    The Master Servicer will 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 will:
 
       (1) hold all  amounts  deposited  with  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 provided in the applicable Pooling and Servicing
    Agreement;
 
       (2) give  the Trustee notice of any default by the Master Servicer in the
           making of such deposit; and
 
       (3) at any time during the continuance of any such default, upon  written
           request to the Trustee, forthwith pay to the Trustee all amounts held
    in trust by such Paying Agent.
 
PERIODIC ADVANCES AND LIMITATIONS THEREON
 
    Generally  each Servicer will  be required to make  (i) Periodic Advances to
cover delinquent payments of  principal and interest on  such Mortgage Loan  and
(ii)  other advances of  cash ("Other Advances"  and, collectively with Periodic
Advances, "Advances")  to  cover (x)  delinquent  payments of  taxes,  insurance
premiums,   and  other  escrowed  items  and  (y)  rehabilitation  expenses  and
foreclosure costs, including reasonable attorneys'  fees, in either case  unless
such  Servicer has determined that any subsequent payments on that Mortgage Loan
or from the borrower will ultimately not be available to reimburse such Servicer
for such amounts.  The failure  of the Servicer  to make  any required  Periodic
Advances or Other Advances under an Underlying Servicing Agreement constitutes a
default  under such  agreement for which  the Servicer will  be terminated. Upon
default by a Servicer, other than Norwest Mortgage, the Master Servicer may, and
upon default by Norwest Mortgage the Trustee may, in each case if so provided in
the Pooling and Servicing  Agreement, be required to  make Periodic Advances  to
the  extent necessary to make required  distributions on certain Certificates or
certain Other  Advances,  provided  that  the Master  Servicer  or  Trustee,  as
applicable,  determines that funds will ultimately be available to reimburse it.
In the  case of  Certificates of  any  Series for  which credit  enhancement  is
provided  in the form of a mortgage pool insurance policy, the Seller may obtain
an endorsement to the  mortgage pool insurance policy  which obligates the  Pool
Insurer  to  advance delinquent  payments of  principal  and interest.  The Pool
Insurer would  only  be obligated  under  such  endorsement to  the  extent  the
mortgagor fails to make such payment and the Master Servicer or Trustee fails to
make a required advance.
 
    The  advance obligation  of the Master  Servicer and Trustee  may be further
limited to an amount specified by the Rating Agency rating the Certificates. Any
such Periodic Advances by  the Servicers or the  Master Servicer or Trustee,  as
the   case   may   be,  must   be   deposited  into   the   applicable  Servicer
 
                                       46
<PAGE>
Custodial Account or the Certificate Account and  will be due no later than  the
business  day  before the  Distribution Date  to  which such  delinquent payment
relates. Advances by  the Servicers or  the Master Servicer  or Trustee, as  the
case  may  be, will  be reimbursable  out of  insurance proceeds  or Liquidation
Proceeds of, or,  except for Other  Advances, future payments  on, the  Mortgage
Loans  for which such amounts  were advanced. If an  Advance made by a Servicer,
the Master Servicer  or the Trustee  later proves,  or is deemed  by the  Master
Servicer or the Trustee, to be unrecoverable, such Servicer, the Master Servicer
or the Trustee, as the case may be, will be entitled to reimbursement from funds
in  the  Certificate  Account  prior  to the  distribution  of  payments  to the
Certificateholders  to  the  extent  provided  in  the  Pooling  and   Servicing
Agreement.
 
    Any Periodic Advances made by a Servicer, the Master Servicer or the Trustee
with  respect to Mortgage Loans included in  the Trust Estate for any Series are
intended to  enable  the  Trustee  to  make  timely  payment  of  the  scheduled
distributions  of principal  and interest  on the  Certificates of  such Series.
However, neither the Master  Servicer, the Trustee, any  Servicer nor any  other
person  will,  except  as  otherwise  specified  in  the  applicable  Prospectus
Supplement, insure or guarantee the Certificates  of any Series or the  Mortgage
Loans included in the Trust Estate for any Certificates.
 
COLLECTION AND OTHER SERVICING PROCEDURES
 
    Each Servicer will be required by the related Underlying Servicing Agreement
to make reasonable efforts to collect all payments called for under the Mortgage
Loans and, consistent with the applicable Underlying Servicing Agreement and any
applicable  agreement governing any  form of credit  enhancement, to follow such
collection procedures as it follows with  respect to mortgage loans serviced  by
it  that are comparable  to the Mortgage  Loans. Consistent with  the above, the
Servicer may, in  its discretion,  (i) waive any  prepayment charge,  assumption
fee,  late payment charge or any other  charge in connection with the prepayment
of a  Mortgage  Loan and  (ii)  arrange with  a  mortgagor a  schedule  for  the
liquidation  of deficiencies running for not more  than 180 days (or such longer
period to which the Master Servicer  and any applicable Pool Insurer or  primary
mortgage insurer have consented) after the applicable Due Date.
 
    Under  each  Underlying Servicing  Agreement, each  Servicer, to  the extent
permitted by law, will establish and maintain one or more escrow accounts  (each
such  account,  a  "Servicing Account")  in  which  each such  Servicer  will be
required to  deposit any  payments  made by  mortgagors  in advance  for  taxes,
assessments,  primary mortgage (if applicable) and hazard insurance premiums and
other similar  items. Withdrawals  from the  Servicing Account  may be  made  to
effect  timely payment of taxes, assessments,  mortgage and hazard insurance, to
refund to  mortgagors amounts  determined to  be overages,  to pay  interest  to
mortgagors  on balances in the Servicing Account,  if required, and to clear and
terminate such account. Each Servicer will be responsible for the administration
of its  Servicing Account.  A  Servicer will  be  obligated to  advance  certain
amounts  which are  not timely  paid by  the mortgagors,  to the  extent that it
determines, in  good faith,  that  they will  be  recoverable out  of  insurance
proceeds,   liquidation  proceeds,  or  otherwise.  Alternatively,  in  lieu  of
establishing a Servicing Account, a Servicer  may procure a performance bond  or
other form of insurance coverage, in an amount acceptable to the Master Servicer
and  each Rating Agency rating the related Series of Certificates, covering loss
occasioned by the failure to escrow such amounts.
 
ENFORCEMENT OF DUE-ON-SALE CLAUSES; REALIZATION UPON DEFAULTED MORTGAGE LOANS
 
    With respect  to  each Mortgage  Loan  having  a fixed  interest  rate,  the
applicable  Underlying Servicing Agreement will generally provide that, when any
Mortgaged Property is about to be conveyed by the mortgagor, the Servicer  will,
to  the extent  it has  knowledge of  such prospective  conveyance, exercise its
rights to accelerate the maturity of such Mortgage Loan under the  "due-on-sale"
clause applicable thereto, if any, unless it is not exercisable under applicable
law  or if such exercise would result in loss of insurance coverage with respect
to such Mortgage Loan or would, in the Servicer's judgment, be reasonably likely
to result in litigation by the mortgagor and such Servicer has not obtained  the
Master  Servicer's consent  to such  exercise. In  either case,  the Servicer is
authorized to take or enter into  an assumption and modification agreement  from
or with the person to whom such
 
                                       47
<PAGE>
Mortgaged  Property has been or is about  to be conveyed, pursuant to which such
person becomes  liable  under  the  Mortgage  Note  and,  unless  prohibited  by
applicable  state law, the  mortgagor remains liable  thereon, provided that the
Mortgage Loan will continue to be covered  by any pool insurance policy and  any
related  primary mortgage insurance  policy and the  Mortgage Interest Rate with
respect to such Mortgage Loan and the payment terms shall remain unchanged.  The
Servicer  will also be authorized,  with the prior approval  of the pool insurer
and the  primary mortgage  insurer, if  any,  to enter  into a  substitution  of
liability  agreement with such person, pursuant  to which the original mortgagor
is released  from liability  and such  person is  substituted as  mortgagor  and
becomes liable under the Mortgage Note.
 
    Each Underlying Servicing Agreement and Pooling and Servicing Agreement with
respect  to a Series  will require the  Servicer or the  Master Servicer, as the
case may  be,  to present  claims  to the  insurer  under any  insurance  policy
applicable  to the Mortgage Loans  included in the Trust  Estate for such Series
and to take such reasonable steps as are necessary to permit recovery under such
insurance policies with respect  to defaulted Mortgage Loans,  or losses on  the
Mortgaged Property securing the Mortgage Loans.
 
    Each  Servicer  is  obligated  under  the  applicable  Underlying  Servicing
Agreement for each Series to realize upon defaulted Mortgage Loans in accordance
with its normal servicing  practices, which will conform  generally to those  of
prudent  mortgage lending institutions which service  mortgage loans of the same
type in the same jurisdictions.  Notwithstanding the foregoing, the Servicer  is
authorized  under the  applicable Underlying  Servicing Agreement  to permit the
assumption of a  defaulted Mortgage Loan  rather than to  foreclose or accept  a
deed-in-lieu  of  foreclosure if,  in the  Servicer's  judgment, the  default is
unlikely to  be  cured  and  the  assuming  borrower  meets  Norwest  Mortgage's
applicable  underwriting guidelines. In connection with any such assumption, the
Mortgage Interest Rate and the payment  terms of the related Mortgage Note  will
not be changed. Each Servicer may also, with the consent of the Master Servicer,
modify  the payment terms of Mortgage Loans that  are in default, or as to which
default is reasonably foreseeable, that remain  in the Trust Estate rather  than
foreclose  on  such Mortgage  Loans; provided  that  no such  modification shall
forgive principal  owing under  such  Mortgage Loan  or permanently  reduce  the
interest  rate on such  Mortgage Loan. Any  such modification will  be made only
upon the  determination  by the  Servicer  and  the Master  Servicer  that  such
modification  is likely to increase the proceeds  of such Mortgage Loan over the
amount expected to be collected pursuant  to foreclosure. See also "The  Pooling
and  Servicing  Agreement --  Optional Purchases,"  above,  with respect  to the
Seller's right to repurchase Mortgage Loans that are in default, or as to  which
default  is  reasonably  foreseeable.  Further,  a  Servicer  may  encourage the
refinancing of  such defaulted  Mortgage Loans,  including Mortgage  Loans  that
would permit creditworthy borrowers to assume the outstanding indebtedness.
 
    In  the case  of foreclosure or  of damage  to a Mortgaged  Property from an
uninsured cause, the Servicer will  not be required to  expend its own funds  to
foreclose  or restore any damaged property,  unless it reasonably determines (i)
that  such   foreclosure  or   restoration  will   increase  the   proceeds   to
Certificateholders  of such  Series of  liquidation of  the Mortgage  Loan after
reimbursement to  the related  Servicer  for its  expenses  and (ii)  that  such
expenses  will  be  recoverable  to  it  through  Liquidation  Proceeds  or  any
applicable insurance policy in respect of such Mortgage Loan. In the event  that
Servicer  has  expended its  own  funds for  foreclosure  or to  restore damaged
property, it will be entitled to be reimbursed from the Certificate Account  for
such Series an amount equal to all costs and expenses incurred by it.
 
    Norwest  Mortgage will not be obligated to,  and any other Servicer will not
(except with the express written approval of the Master Servicer), foreclose  on
any Mortgaged Property which it believes may be contaminated with or affected by
hazardous  wastes or  hazardous substances.  See "Certain  Legal Aspects  of the
Mortgage  Loans  --  Environmental  Considerations."  If  a  Servicer  does  not
foreclose  on a Mortgaged Property, the Certificateholders of the related Series
may experience a  loss on  the related  Mortgage Loan.  A Servicer  will not  be
liable  to  the  Certificateholders if  it  fails  to foreclose  on  a Mortgaged
Property which it  believes may  be so contaminated  or affected,  even if  such
 
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<PAGE>
Mortgaged  Property is, in fact, not  so contaminated or affected. Conversely, a
Servicer will not be  liable to the Certificateholders  if, based on its  belief
that  no  such contamination  or  effect exists,  the  Servicer forecloses  on a
Mortgaged Property and takes  title to such  Mortgaged Property, and  thereafter
such Mortgaged Property is determined to be so contaminated or affected.
 
    The  Servicer may foreclose  against property securing  a defaulted Mortgage
Loan either by foreclosure, by sale or by strict foreclosure and in the event  a
deficiency  judgment is  available against  the mortgagor  or other  person (see
"Certain Legal Aspects of the Mortgage Loans -- Anti-Deficiency Legislation  and
Other Limitations on Lenders" for a discussion of the availability of deficiency
judgments), may proceed for the deficiency. It is anticipated that in most cases
the  Servicer will not seek deficiency judgments, and will not be required under
the applicable Underlying Servicing Agreement  to seek deficiency judgments.  In
lieu  of foreclosure, each Servicer may arrange  for the sale by the borrower of
the Mortgaged Property related  to a defaulted Mortgage  Loan to a third  party,
rather than foreclosing upon and selling such Mortgaged Property.
 
    With respect to a Trust Estate (or any segregated pool of assets therein) as
to  which a REMIC election  has been made, if  the Trustee acquires ownership of
any Mortgaged  Property as  a  result of  a  default or  reasonably  foreseeable
default  of any Mortgage Loan secured by such Mortgaged Property, the Trustee or
Master Servicer will be  required to dispose of  such property within two  years
following its acquisition by the Trust Estate unless the Trustee (a) receives an
opinion  of counsel to the effect that  the holding of the Mortgaged Property by
the Trust Estate will  not cause the Trust  Estate to be subject  to the tax  on
"prohibited  transactions" imposed by Code Section 860F(a)(1) or cause the Trust
Estate (or any segregated pool of assets  therein as to which one or more  REMIC
elections  have been made or will be made) to  fail to qualify as a REMIC or (b)
applies for and is  granted an extension  of the two-year  period in the  manner
contemplated  by Code Section  856(e)(3). The Servicer also  will be required to
administer the Mortgaged Property in a manner which does not cause the Mortgaged
Property to fail to qualify as "foreclosure property" within the meaning of Code
Section 860G(a)(8) or  result in the  receipt by  the Trust Estate  of any  "net
income from foreclosure property" within the meaning of Code Section 860G(c)(2),
respectively.  In  general, this  would preclude  the  holding of  the Mortgaged
Property by a party acting as a dealer in such property or the receipt of rental
income based on the profits of the lessee of such property. See "Certain Federal
Income Tax Consequences."
 
INSURANCE POLICIES
 
    Each Underlying Servicing  Agreement will  require the  related Servicer  to
cause to be maintained for each Mortgage Loan a standard hazard insurance policy
issued  by  a  generally acceptable  insurer  insuring the  improvements  on the
Mortgaged Property  underlying such  Mortgage Loan  against loss  by fire,  with
extended  coverage  (a  "Standard  Hazard  Insurance  Policy").  The  Underlying
Servicing Agreements will require that such Standard Hazard Insurance Policy  be
in  an amount at least equal to the lesser of 100% of the insurable value of the
improvements on the Mortgaged Property or the principal balance of such Mortgage
Loan; provided, however, that  such insurance may not  be less than the  minimum
amount required to fully compensate for any damage or loss on a replacement cost
basis.  Each Servicer will also maintain  on property acquired upon foreclosure,
or deed  in  lieu  of foreclosure,  of  any  Mortgage Loan,  a  Standard  Hazard
Insurance  Policy in an amount that  is at least equal to  the lesser of 100% of
the insurable value of the improvements which are a part of such property or the
principal balance of such  Mortgage Loan plus  accrued interest and  liquidation
expenses;  provided,  however, that  such  insurance may  not  be less  than the
minimum amount  required  to  fully compensate  for  any  damage or  loss  on  a
replacement  cost basis.  Any amounts collected  under any  such policies (other
than amounts  to  be applied  to  the restoration  or  repair of  the  Mortgaged
Property  or  released  to  the borrower  in  accordance  with  normal servicing
procedures) will be deposited in  the Servicer Custodial Account for  remittance
to the Certificate Account by a Servicer.
 
    The Standard Hazard Insurance Policies covering the Mortgage Loans generally
will  cover  physical damage  to,  or destruction  of,  the improvements  on the
Mortgaged Property caused by fire, lightning, explosion, smoke, windstorm, hail,
riot, strike  and civil  commotion,  subject to  the conditions  and  exclusions
particularized  in each policy.  Because the Standard  Hazard Insurance Policies
 
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<PAGE>
relating to such Mortgage Loans will  be underwritten by different insurers  and
will  cover Mortgaged Properties  located in various  states, such policies will
not contain identical terms and conditions. The most significant terms  thereof,
however,  generally  will  be determined  by  state  law and  generally  will be
similar. Most  such  policies  typically  will not  cover  any  physical  damage
resulting  from the following: war, revolution, governmental actions, floods and
other water-related causes,  earth movement  (including earthquakes,  landslides
and  mudflows), nuclear  reaction, wet or  dry rot, vermin,  rodents, insects or
domestic animals,  hazardous  wastes  or hazardous  substances,  theft  and,  in
certain  cases, vandalism.  The foregoing list  is merely  indicative of certain
kinds of uninsured risks and is not all-inclusive.
 
    In general, if the  improvements on a Mortgaged  Property are located in  an
area  identified in  the Federal  Register by  the Federal  Emergency Management
Agency as having special flood hazards  (and such flood insurance has been  made
available) each Underlying Servicing Agreement will require the related Servicer
to  cause to be maintained a flood  insurance policy meeting the requirements of
the current guidelines of the Federal Insurance Administration with a  generally
acceptable insurance carrier. Generally, the Underlying Servicing Agreement will
require that such flood insurance be in an amount not less than the least of (i)
the  outstanding principal balance of the Mortgage Loan, (ii) the full insurable
value of the  improvements, or (iii)  the maximum amount  of insurance which  is
available  under the Flood Disaster Protection  Act of 1973, as amended. Norwest
Mortgage does  not  provide  financing  for flood  zone  properties  located  in
communities  not participating  in the  National Flood  Insurance Program  or if
available insurance coverage is, in its judgment, unrealistically low.
 
    Each Servicer may maintain a  blanket policy insuring against hazard  losses
on  all of the Mortgaged Properties in lieu of maintaining the required Standard
Hazard Insurance Policies  and may  maintain a blanket  policy insuring  against
special  hazards  in  lieu of  maintaining  any required  flood  insurance. Each
Servicer will be liable for the amount of any deductible under a blanket  policy
if  such amount would have been covered  by a required Standard Hazard Insurance
Policy or flood insurance, had it been maintained.
 
    Any losses incurred with  respect to Mortgage Loans  due to uninsured  risks
(including  earthquakes,  mudflows,  floods and  hazardous  wastes  or hazardous
substances) or  insufficient hazard  insurance  proceeds will  adversely  affect
distributions to the Certificateholders.
 
FIXED RETAINED YIELD, SERVICING COMPENSATION AND PAYMENT OF EXPENSES
 
    Fixed  Retained Yield with respect to any  Mortgage Loan is that portion, if
any, of interest  at the  Mortgage Interest  Rate that  is not  included in  the
related  Trust  Estate.  The Prospectus  Supplement  for a  Series  will specify
whether there is any Fixed Retained Yield with respect to the Mortgage Loans  of
such  Series.  If  so,  the  Fixed  Retained  Yield  will  be  established  on a
loan-by-loan basis  and will  be specified  in the  schedule of  Mortgage  Loans
attached  as  an  exhibit to  the  applicable Pooling  and  Servicing Agreement.
Norwest Mortgage as Servicer may deduct the Fixed Retained Yield from  mortgagor
payments  as received or deposit such payments in the Servicer Custodial Account
or Certificate  Account for  such  Series and  then  either withdraw  the  Fixed
Retained  Yield from  the Servicer Custodial  Account or  Certificate Account or
request the  Master Servicer  to  withdraw the  Fixed  Retained Yield  from  the
Certificate Account for remittance to Norwest Mortgage. In the case of any Fixed
Retained  Yield with respect to Mortgage Loans serviced by a Servicer other than
Norwest Mortgage, the Master Servicer will make withdrawals from the Certificate
Account for the purpose of remittances to Norwest Mortgage as owner of the Fixed
Retained Yield. Notwithstanding the  foregoing, with respect  to any payment  of
interest  received by Norwest  Mortgage as Servicer relating  to a Mortgage Loan
(whether paid by the  mortgagor or received  as Liquidation Proceeds,  insurance
proceeds  or otherwise) which is less than  the full amount of interest then due
with respect to such Mortgage Loan, the  owner of the Fixed Retained Yield  with
respect  to  such Mortgage  Loan  will bear  a  ratable share  of  such interest
shortfall.
 
    For each Series of Certificates, each  Servicer will be entitled to be  paid
the  Servicing Fee on the related Mortgage Loans serviced by such Servicer until
termination of the applicable Underlying
 
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<PAGE>
Servicing Agreement. A Servicer, at its election, will pay itself the  Servicing
Fee  for a  Series with  respect to  each Mortgage  Loan by  (a) withholding the
Servicing Fee from any  scheduled payment of interest  prior to deposit of  such
payment in the Servicer Custodial Account for such Series or (b) withdrawing the
Servicing  Fee from  the Servicer  Custodial Account  after the  entire interest
payment has been deposited in such account.  A Servicer may also pay itself  out
of  the Liquidation Proceeds of a Mortgage Loan or other recoveries with respect
thereto, or withdraw from the Servicer  Custodial Account or request the  Master
Servicer to withdraw from the Certificate Account for remittance to the Servicer
such  amounts after the deposit thereof in such accounts, or if such Liquidation
Proceeds or other recoveries are insufficient, from Net Foreclosure Profits with
respect to the related  Distribution Date the Servicing  Fee in respect of  such
Mortgage  Loan to  the extent provided  in the applicable  Pooling and Servicing
Agreement. The Servicing Fee or the range of Servicing Fees with respect to  the
Mortgage  Loans underlying the Certificates of a Series will be specified in the
applicable Prospectus Supplement. Additional servicing compensation in the  form
of  prepayment charges, assumption fees, late  payment charges or otherwise will
be retained by the Servicers.
 
    Each Servicer  will  pay  all  expenses  incurred  in  connection  with  the
servicing  of the Mortgage Loans serviced  by such Servicer underlying a Series,
including, without limitation, payment of the hazard insurance policy  premiums.
The  Servicer will be entitled, in  certain circumstances, to reimbursement from
the Certificate Account of  Periodic Advances, of Other  Advances made by it  to
pay  taxes, insurance premiums  and similar items with  respect to any Mortgaged
Property or for expenditures incurred by it in connection with the  restoration,
foreclosure  or  liquidation  of  any  Mortgaged  Property  (to  the  extent  of
Liquidation Proceeds or insurance policy  proceeds in respect of such  Mortgaged
Property)  and of certain  losses against which  it is indemnified  by the Trust
Estate.
 
    As set  forth in  the preceding  paragraph, a  Servicer may  be entitled  to
reimbursement  for certain  expenses incurred by  it, and  payment of additional
fees for certain extraordinary services rendered by it (provided that such  fees
do  not  exceed  those which  would  be  charged by  third  parties  for similar
services) in connection  with the  liquidation of defaulted  Mortgage Loans  and
related  Mortgaged Properties. In the  event that claims are  either not made or
are not fully paid from any  applicable form of credit enhancement, the  related
Trust  Estate will suffer a loss to  the extent that Liquidation Proceeds, after
reimbursement of the Servicing  Fee and the expenses  of the Servicer, are  less
than the principal balance of the related Mortgage Loan.
 
EVIDENCE AS TO COMPLIANCE
 
    Each  Servicer will deliver  annually to the Trustee  or Master Servicer, as
applicable, on  or  before  the  date specified  in  the  applicable  Underlying
Servicing  Agreement, an Officer's Certificate stating  that (i) a review of the
activities  of  such  Servicer  during  the  preceding  calendar  year  and   of
performance  under the applicable  Underlying Servicing Agreement  has been made
under the supervision of such  officer, and (ii) to  the best of such  officer's
knowledge, based on such review, such Servicer has fulfilled all its obligations
under the applicable Underlying Servicing Agreement throughout such year, or, if
there  has been a default in the  fulfillment of any such obligation, specifying
each such default known to such officer and the nature and status thereof.  Such
Officer's  Certificate  shall  be  accompanied  by  a  statement  of  a  firm of
independent  public  accountants  to  the  effect  that,  on  the  basis  of  an
examination  of certain documents and records relating to a random sample of the
mortgage loans  being serviced  by  such Servicer  pursuant to  such  Underlying
Servicing  Agreement and/or other similar agreements, conducted substantially in
compliance with  the Uniform  Single  Audit Program  for Mortgage  Bankers,  the
servicing of such mortgage loans was conducted in compliance with the provisions
of  the applicable Underlying Servicing  Agreement and other similar agreements,
except for (i) such exceptions as such  firm believes to be immaterial and  (ii)
such other exceptions as are set forth in such statement.
 
    The  Master Servicer will deliver annually to  the Trustee, on or before the
date specified in the applicable  Pooling and Servicing Agreement, an  Officer's
Certificate stating that such officer has
 
                                       51
<PAGE>
received,   with  respect  to  each  Servicer,  the  Officer's  Certificate  and
accountant's statement described in  the preceding paragraph,  and, that on  the
basis  of such officer's review of such information, each Servicer has fulfilled
all  its  obligations  under  the  applicable  Underlying  Servicing   Agreement
throughout  such year, or, if there has been a default in the fulfillment of any
such obligation, specifying  each such  default known  to such  officer and  the
nature and status thereof.
 
                 CERTAIN MATTERS REGARDING THE MASTER SERVICER
 
    The Master Servicer may not resign from its obligations and duties under the
Pooling  and  Servicing Agreement  for each  Series without  the consent  of the
Trustee, except upon its determination that its duties thereunder are no  longer
permissible  under  applicable law  or  are in  material  conflict by  reason of
applicable law with any other activities of a type and nature carried on by  it.
No such resignation will become effective until the Trustee for such Series or a
successor  master  servicer has  assumed the  Master Servicer's  obligations and
duties under the Pooling and Servicing Agreement. If the Master Servicer resigns
for any of  the foregoing  reasons and  the Trustee  is unable  or unwilling  to
assume  responsibility for its duties under the Pooling and Servicing Agreement,
it may appoint another institution to so act as described under "The Pooling and
Servicing Agreement -- Rights Upon Event of Default" below.
 
    The Pooling  and Servicing  Agreement  will also  provide that  neither  the
Master  Servicer  nor any  subcontractor,  nor any  partner,  director, officer,
employee or agent  of any  of them,  will be under  any liability  to the  Trust
Estate or the Certificateholders, for the taking of any action or for refraining
from  the  taking  of any  action  in good  faith  pursuant to  the  Pooling and
Servicing Agreement, or for errors in judgment; provided, however, that  neither
the  Master Servicer, any  subcontractor, nor any such  person will be protected
against any  liability that  would otherwise  be imposed  by reason  of  willful
misfeasance,  bad faith  or gross  negligence in the  performance of  his or its
duties or by reason of reckless disregard  of his or its obligations and  duties
thereunder.  The Pooling and  Servicing Agreement will  further provide that the
Master Servicer, any subcontractor, and any partner, director, officer, employee
or agent of either  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  the Pooling  and Servicing
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  thereunder or by reason of reckless  disregard
of  his or its obligations  and duties thereunder. In  addition, the Pooling and
Servicing Agreement will provide that the Master Servicer will not be under  any
obligation  to  appear in,  prosecute or  defend  any legal  action that  is not
incidental to its duties under the  Pooling and Servicing Agreement and that  in
its opinion may involve it in any expense or liability. The Master Servicer may,
however,  in its discretion, undertake any such action deemed by it necessary or
desirable with respect to the Pooling and Servicing Agreement and the rights and
duties of  the  parties thereto  and  the interests  of  the  Certificateholders
thereunder.  In such event, the legal expenses  and costs of such action and any
liability resulting therefrom  will be  expenses, costs and  liabilities of  the
Trust  Estate and the Master Servicer will be entitled to be reimbursed therefor
out of the Certificate Account,  and any loss to  the Trust Estate arising  from
such  right  of  reimbursement  will  be  allocated  first  to  the Subordinated
Certificate  of  a  Series  before   being  allocated  to  the  related   Senior
Certificates,  or if such Series does not contain Subordinated Certificates, pro
rata among the various Classes of Certificates unless otherwise specified in the
applicable Pooling and Servicing Agreement.
 
    Any person into which the Master Servicer may be merged or consolidated,  or
any  person resulting from any merger,  conversion or consolidation to which the
Master Servicer is a party, or any person succeeding to the business through the
transfer of  substantially all  of its  assets or  all assets  relating to  such
business,  or otherwise,  of the  Master Servicer will  be the  successor of the
Master Servicer  under  the Pooling  and  Servicing Agreement  for  each  Series
provided  that such successor  or resulting entity  has a net  worth of not less
than $15,000,000 and is qualified to service mortgage loans for FNMA or FHLMC.
 
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<PAGE>
    The Master Servicer also has the right to assign its rights and delegate its
duties and  obligations  under the  Pooling  and Servicing  Agreement  for  each
Series;  provided that, if the  Master Servicer desires to  be released from its
obligations under  the Pooling  and Servicing  Agreement, (i)  the purchaser  or
transferee  accepting  such assignment  or  delegation is  qualified  to service
mortgage loans for  FNMA or  FHLMC, (ii) the  purchaser is  satisfactory to  the
Trustee  for  such  Series, in  the  reasonable  exercise of  its  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
under the  Pooling and  Servicing Agreement  from  and after  the date  of  such
agreement;  and (iii) each applicable Rating Agency's rating of any Certificates
for such Series in effect immediately prior to such assignment, sale or transfer
would not be qualified, downgraded or withdrawn as a result of such  assignment,
sale  or transfer  and the  Certificates would  not be  placed on  credit review
status by any such Rating Agency. The Master Servicer will be released from  its
obligations  under the Pooling and Servicing  Agreement upon any such assignment
and delegation,  except that  the Master  Servicer will  remain liable  for  all
liabilities and obligations incurred by it prior to the time that the conditions
contained in clauses (i), (ii) and (iii) above are met.
 
                      THE POOLING AND SERVICING AGREEMENT
 
ASSIGNMENT OF MORTGAGE LOANS TO THE TRUSTEE
 
    The  Seller will  have acquired  the Mortgage  Loans included  in each Trust
Estate from Norwest  Mortgage pursuant  to an agreement  (the "Norwest  Mortgage
Sale Agreement"). In connection with the conveyance of the Mortgage Loans to the
Seller,  Norwest Mortgage  will (i) agree  to deliver  to the Seller  all of the
documents which the  Seller is  required to deliver  to the  Trustee; (ii)  make
certain  representations and warranties to the Seller which will be the basis of
certain of the Seller's representations and warranties to the Trustee or  assign
the  representations and warranties made by a Correspondent to Norwest Mortgage;
and (iii) agree to  repurchase or substitute (or  assign rights to a  comparable
agreement  of a Correspondent) for  any Mortgage Loan for  which any document is
not delivered or  is found to  be defective  in any material  respect, or  which
Mortgage  Loan  is discovered  at any  time not  to be  in conformance  with any
representation and warranty  Norwest Mortgage  has made  to the  Seller and  the
breach  of such representation and warranty materially and adversely affects the
interests of the  Certificateholders in  the related Mortgage  Loan, if  Norwest
Mortgage  cannot deliver such document  or cure such defect  or breach within 60
days after  notice thereof.  Such agreement  will inure  to the  benefit of  the
Trustee  and is intended to help ensure  the Seller's performance of its limited
obligation to repurchase  or substitute  for Mortgage Loans.  See "The  Mortgage
Loan Programs -- Representations and Warranties" above.
 
    At  the time of issuance of each  Series of Certificates, the Mortgage Loans
in the  related  Trust Estate  will,  pursuant  to the  applicable  Pooling  and
Servicing Agreement, be assigned to the Trustee, together with all principal and
interest received on or with respect to such Mortgage Loans after the applicable
Cut-Off Date other than principal and interest due and payable on or before such
Cut-Off  Date  and interest  attributable to  the Fixed  Retained Yield  on such
Mortgage Loans, if any. See "Servicing  of the Mortgage Loans -- Fixed  Retained
Yield, Servicing Compensation and Payment of Expenses." The Trustee or its agent
will,   concurrently  with   such  assignment,  authenticate   and  deliver  the
Certificates evidencing such Series to the  Seller in exchange for the  Mortgage
Loans.  Each Mortgage  Loan will  be identified  in a  schedule appearing  as an
exhibit to the applicable  Pooling and Servicing  Agreement. Each such  schedule
will  include, among other things, the unpaid  principal balance as of the close
of business on the applicable Cut-Off  Date, the maturity date and the  Mortgage
Interest Rate for each Mortgage Loan in the related Trust Estate.
 
    In  addition, with  respect to  each Mortgage  Loan in  a Trust  Estate, the
mortgage or other promissory note, any assumption, modification or conversion to
fixed interest rate agreement, a mortgage assignment in recordable form and  the
recorded  Mortgage (or other  documents as are required  under applicable law to
create  perfected  security  interest  in   the  Mortgaged  Property  in   favor
 
                                       53
<PAGE>
of  the  Trustee) will  be  delivered to  the Trustee  or,  if indicated  in the
applicable Prospectus Supplement,  to a custodian;  provided that, in  instances
where  recorded documents cannot  be delivered due to  delays in connection with
recording, copies  thereof, certified  by the  Seller to  be true  and  complete
copies  of such documents sent for recording,  may be delivered and the original
recorded documents will be  delivered promptly upon  receipt. The assignment  of
each   Mortgage  will  be  recorded  promptly  after  the  initial  issuance  of
Certificates for  the related  Trust  Estate, except  in  states where,  in  the
opinion  of counsel acceptable to the Trustee, such recording is not required to
protect the Trustee's  interest in the  Mortgage Loan against  the claim of  any
subsequent  transferee or  any successor to  or creditor of  the Seller, Norwest
Mortgage or the originator of such Mortgage Loan.
 
    The Trustee or custodian will hold  such documents in trust for the  benefit
of  Certificateholders  of the  related Series  and  will review  such documents
within 180 days of the date  of the applicable Pooling and Servicing  Agreement.
If  any document is  not delivered or is  found to be  defective in any material
respect, or  if the  Seller  is in  breach of  any  of its  representations  and
warranties,  and such breach  materially and adversely  affects the interests of
the Certificateholders in a  Mortgage Loan, and the  Seller cannot deliver  such
document  or cure  such defect  or breach  within 60  days after  written notice
thereof, the Seller will, within 60  days of such notice, either repurchase  the
related  Mortgage Loan  from the  Trustee at  a price  equal to  the then unpaid
principal balance thereof, plus  accrued and unpaid  interest at the  applicable
Mortgage  Interest Rate (minus any Fixed Retained Yield) through the last day of
the month in which such repurchase takes place, or (in the case of a Series  for
which  one or more REMIC elections have been or will be made, unless the maximum
period as  may  be  provided  by  the Code  or  applicable  regulations  of  the
Department of the Treasury ("Treasury Regulations") shall have elapsed since the
execution of the applicable Pooling and Servicing Agreement) substitute for such
Mortgage  Loan  a  new  mortgage  loan  having  characteristics  such  that  the
representations and warranties  of the  Seller made pursuant  to the  applicable
Pooling and Servicing Agreement (except for representations and warranties as to
the  correctness of  the applicable schedule  of mortgage loans)  would not have
been incorrect  had such  substitute Mortgage  Loan originally  been a  Mortgage
Loan.  In the case  of a repurchased  Mortgage Loan, the  purchase price will be
deposited by the Seller  in the related  Certificate Account. In  the case of  a
substitute  Mortgage Loan, the mortgage file  relating thereto will be delivered
to the Trustee or the custodian and  the Seller will deposit in the  Certificate
Account,  an amount equal to  the excess of (i)  the unpaid principal balance of
the Mortgage  Loan which  is substituted  for, over  (ii) the  unpaid  principal
balance  of the substitute Mortgage Loan,  together with interest on such excess
at the  Mortgage Interest  Rate (minus  any Fixed  Retained Yield)  to the  next
scheduled  Due Date of the  Mortgage Loan which is  being substituted for. In no
event will any substitute Mortgage Loan have an unpaid principal balance greater
than  the  scheduled  principal  balance  calculated  in  accordance  with   the
amortization  schedule (the "Scheduled Principal  Balance") of the Mortgage Loan
for which it  is substituted  (after giving  effect to  the scheduled  principal
payment  due in the month of substitution on the Mortgage Loan substituted for),
or a term greater than, a Mortgage Interest Rate less than, a Mortgage  Interest
Rate  more than  one percent  per annum  greater than  or a  Loan-to-Value Ratio
greater than, the Mortgage Loan for which it is substituted. If substitution  is
to  be made for an  adjustable rate Mortgage Loan,  the substitute Mortgage Loan
will have an unpaid  principal balance no greater  than the Scheduled  Principal
Balance of the Mortgage Loan for which it is substituted (after giving effect to
the scheduled principal payment due in the month of substitution on the Mortgage
Loan  substituted  for), a  Loan-to-Value Ratio  less  than or  equal to,  and a
Mortgage Interest Rate at least equal to, that of the Mortgage Loan for which it
is substituted,  and will  bear interest  based on  the same  index, margin  and
frequency  of  adjustment  as  the  substituted  Mortgage  Loan.  The repurchase
obligation and the mortgage substitution  referred to above will constitute  the
sole remedies available to the Certificateholders or the Trustee with respect to
missing  or defective  documents or breach  of the  Seller's representations and
warranties.
 
    If no custodian is named in the Pooling and Servicing Agreement, the Trustee
will be  authorized  to  appoint  a custodian  to  maintain  possession  of  the
documents  relating to  the Mortgage  Loans and  to conduct  the review  of such
documents described above. Any custodian so appointed will keep and review  such
documents as the Trustee's agent under a custodial agreement.
 
                                       54
<PAGE>
OPTIONAL PURCHASES
 
    Subject to the provisions of the applicable Pooling and Servicing Agreement,
the  Seller or the Master  Servicer may, at such  party's option, repurchase any
Mortgage Loan  which  is  in  default  or as  to  which  default  is  reasonably
foreseeable  if, in the Seller's or  the Master Servicer's judgment, the related
default is not likely to be cured by the borrower or default is not likely to be
averted, at a price equal to  the unpaid principal balance thereof plus  accrued
interest thereon and under the conditions set forth in the applicable Prospectus
Supplement.
 
REPORTS TO CERTIFICATEHOLDERS
 
    Unless  otherwise specified or modified in the related Pooling and Servicing
Agreement for each Series, the Master Servicer will prepare and the Trustee will
include with each distribution to Certificateholders of record of such Series  a
statement setting forth the following information, if applicable:
 
           (i)
           the amount of such distribution allocable to principal of the related
           Mortgage  Loans, separately  identifying the aggregate  amount of any
    principal prepayments  included therein,  the  amount of  such  distribution
    allocable to interest on the related Mortgage Loans and the aggregate unpaid
    principal balance of the Mortgage Loans evidenced by each Class after giving
    effect to the principal distributions on such Distribution Date;
 
          (ii)
           the  amount  of servicing  compensation with  respect to  the related
           Trust Estate and such other  customary information as is required  to
    enable Certificateholders to prepare their tax returns;
 
         (iii)
           the  amount by which  the Servicing Fee  for the related Distribution
           Date has been reduced by interest shortfalls due to prepayments;
 
          (iv)
           the aggregate amount of  any Periodic Advances  by the Servicer,  the
           Master  Servicer  or the  Trustee  included in  the  amounts actually
    distributed to the Certificateholders;
 
           (v)
           to each holder of a Certificate entitled to the benefits of  payments
           under any form of credit enhancement or from any Reserve Fund:
 
              (a)
               the  amounts  so  distributed  under  any  such  form  of  credit
               enhancement or  from  any such  Reserve  Fund on  the  applicable
       Distribution Date; and
 
              (b)
               the  amount of coverage  remaining under any  such form of credit
               enhancement and  the  balance in  any  such Reserve  Fund,  after
       giving  effect  to  any  payments thereunder  and  other  amounts charged
       thereto on the Distribution Date;
 
          (vi)
           in the case of a Series of Certificates with a variable  Pass-Through
           Rate, such Pass-Through Rate;
 
         (vii)
           the book value of any collateral acquired by the Trust Estate through
           foreclosure or otherwise;
 
        (viii)
           the  unpaid principal  balance of any  Mortgage Loan as  to which the
           Servicer has  notified the  Master Servicer  that such  Servicer  has
    determined  not  to  foreclose  because it  believes  the  related Mortgaged
    Property may  be  contaminated  with  or affected  by  hazardous  wastes  or
    hazardous substances; and
 
          (ix)
           the  number  and aggregate  principal  amount of  Mortgage  Loans one
           month, two months and three or more months delinquent.
 
    In addition,  within a  reasonable period  of  time after  the end  of  each
calendar  year, the Master Servicer will furnish either directly, or through the
Trustee, a report to  each Certificateholder of record  at any time during  such
calendar   year  such  information  as  required  by  the  Code  and  applicable
regulations  thereunder  to  enable  Certificateholders  to  prepare  their  tax
returns.  In the event that an election has  been made to treat the Trust Estate
(or   one    or    more    segregated    pools    of    assets    therein)    as
 
                                       55
<PAGE>
a  REMIC, the Trustee will be required  to sign the federal and applicable state
and local income tax returns of the REMIC (which will be prepared by the  Master
Servicer).  See  "Certain  Federal  Income  Tax  Consequences  -- Administrative
Matters."
 
LIST OF CERTIFICATEHOLDERS
 
    The Pooling and Servicing Agreement for each Series will require the Trustee
to  provide  access  to  the  most  current  list  of  names  and  addresses  of
Certificateholders   of   such   Series   to  any   group   of   five   or  more
Certificateholders who  advise  the  Trustee  in writing  that  they  desire  to
communicate with other Certificateholders with respect to their rights under the
Pooling and Servicing Agreement or under the Certificates.
 
EVENTS OF DEFAULT
 
    Events  of Default under the Pooling and Servicing Agreement for each Series
include (i) any failure by the Master Servicer to make a required deposit  which
continues  unremedied for three business days after the giving of written notice
of such failure to the Master Servicer by the Trustee for such Series, or to the
Master Servicer and the  Trustee by the holders  of Certificates of such  Series
having  voting  rights  allocated  to  such  Certificates  ("Voting  Interests")
aggregating not  less  than  25%  of  the  Voting  Interests  allocated  to  all
Certificates  for such Series; (ii)  any failure by the  Master Servicer duly to
observe or  perform  in any  material  respect any  other  of its  covenants  or
agreements in the Pooling and Servicing Agreement which continues unremedied for
60  days (or 30  days in the  case of a  failure to maintain  any pool insurance
policy  required  to  be  maintained  pursuant  to  the  Pooling  and  Servicing
Agreement)  after the  giving of  written notice of  such failure  to the Master
Servicer by  the Trustee,  or to  the Master  Servicer and  the Trustee  by  the
holders  of Certificates aggregating not less  than 25% of the Voting Interests;
(iii) certain events of insolvency,  readjustment of debt, marshaling of  assets
and liabilities or similar proceedings and certain action by the Master Servicer
indicating  its insolvency, reorganization  or inability to  pay its obligations
and (iv) it and any subservicer  appointed by it becoming ineligible to  service
for both FNMA and FHLMC (unless remedied within 90 days). (Section 7.01).
 
RIGHTS UPON EVENT OF DEFAULT
 
    So  long as  an Event  of Default remains  unremedied under  the Pooling and
Servicing Agreement for  a Series,  the Trustee for  such Series  or holders  of
Certificates  of such  Series evidencing  not less  than 66  2/3% of  the Voting
Interests in the Trust Estate  for such Series may  terminate all of the  rights
and obligations of the Master Servicer under the Pooling and Servicing Agreement
and  in and  to the Mortgage  Loans (other  than the Master  Servicer's right to
recovery of  the  aggregate Master  Servicing  Fees due  prior  to the  date  of
termination,  and other expenses  and amounts advanced pursuant  to the terms of
the Pooling  and Servicing  Agreement,  which rights  the Master  Servicer  will
retain  under all circumstances), whereupon the  Trustee will succeed to all the
responsibilities, duties  and  liabilities  of the  Master  Servicer  under  the
Pooling and Servicing Agreement and will be entitled to monthly compensation not
to   exceed  the  aggregate  Master  Servicing  Fees  together  with  the  other
compensation to which  the Master  Servicer is  entitled under  the Pooling  and
Servicing  Agreement. In the event that the Trustee is unwilling or unable so to
act, it  may select,  pursuant to  the  public bid  procedure described  in  the
applicable  Pooling and  Servicing Agreement, or  petition a  court of competent
jurisdiction to  appoint,  a  housing  and home  finance  institution,  bank  or
mortgage  servicing institution with a net worth  of at least $10,000,000 to act
as successor to  the Master  Servicer under the  provisions of  the Pooling  and
Servicing  Agreement;  provided  however,  that until  such  a  successor Master
Servicer  is  appointed  and  has  assumed  the  responsibilities,  duties   and
liabilities  of the Master  Servicer under the  Pooling and Servicing Agreement,
the Trustee shall continue as the successor to the Master Servicer as  described
above.  In the event such public bid  procedure is utilized, the successor would
be entitled to compensation in an amount equal to the aggregate Master Servicing
Fees, together  with the  other compensation  to which  the Master  Servicer  is
entitled  under the  Pooling and  Servicing Agreement,  and the  Master Servicer
would be entitled to receive the net profits, if any, realized from the sale  of
its  rights and obligations under the Pooling and Servicing Agreement. (Sections
7.01 and 7.05).
 
                                       56
<PAGE>
    During  the  continuance  of any  Event  of  Default under  the  Pooling and
Servicing Agreement for  a Series,  the Trustee for  such Series  will have  the
right  to take  action to  enforce its  rights and  remedies and  to protect and
enforce the rights and  remedies of the Certificateholders  of such Series,  and
holders of Certificates evidencing not less than 25% of the Voting Interests for
such Series 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.  However,
the  Trustee will not  be under any obligation  to pursue any  such remedy or to
exercise any  of  such trusts  or  powers unless  such  Certificateholders  have
offered  the Trustee reasonable security or indemnity against the cost, expenses
and liabilities which may be incurred by the Trustee thereby. Also, the  Trustee
may  decline to  follow any  such direction if  the Trustee  determines that the
action or proceeding so directed may not  lawfully be taken or would involve  it
in   personal  liability  or  be   unjustly  prejudicial  to  the  non-assenting
Certificateholders. (Sections 7.02 and 7.03).
 
    No Certificateholder of a Series, solely  by virtue of such holder's  status
as  a Certificateholder,  will have  any right  under the  Pooling and Servicing
Agreement for  such Series  to  institute any  proceeding  with respect  to  the
Pooling  and Servicing Agreement, unless such holder previously has given to the
Trustee for such  Series written  notice of default  and unless  the holders  of
Certificates  evidencing  not less  than 25%  of the  Voting Interests  for such
Series have made written request upon  the Trustee to institute such  proceeding
in its own name as Trustee thereunder and have offered to the Trustee reasonable
indemnity  and the Trustee for 60 days has neglected or refused to institute any
such proceeding. (Section 10.03).
 
AMENDMENT
 
    Each Pooling  and Servicing  Agreement may  be amended  by the  Seller,  the
Master  Servicer and the Trustee without  the consent of the Certificateholders,
(i) to  cure  any  ambiguity or  mistake,  (ii)  to correct  or  supplement  any
provision  therein that  may be inconsistent  with any  other provision 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 (or one or
more segregated  pools of  assets therein)  as a  REMIC at  all times  that  any
Certificates  are outstanding or to avoid or minimize the risk of the imposition
of any tax  on the  Trust Estate  pursuant to  the Code  that would  be a  claim
against  the Trust Estate, provided that 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  such action will  not, as  evidenced by such  opinion of  counsel,
adversely affect in any material respect the interests of any Certificateholder,
(iv)  to  change  the timing  and/or  nature  of deposits  into  the Certificate
Account, provided  that such  change will  not, as  evidenced by  an opinion  of
counsel,  adversely  affect  in  any  material  respect  the  interests  of  any
Certificateholder and  that  such change  will  not adversely  affect  the  then
current  rating assigned to any Certificates, as evidenced by a letter from each
Rating Agency to such effect, (v) to add to, modify or eliminate any  provisions
therein  restricting transfers of residual  Certificates to certain disqualified
organizations described below under "Certain Federal Income Tax Consequences  --
Federal  Income Tax Consequences for REMIC  Certificates -- Taxation of Residual
Certificates -- Tax-Related Restrictions on Transfer of Residual  Certificates,"
(vi)  to make certain provisions  with respect to the  denominations of, and the
manner of payments on, certain  Classes or Subclasses of Certificates  initially
retained  by the Seller or  an affiliate, or (vii)  to make any other provisions
with respect to matters  or questions arising under  such Pooling and  Servicing
Agreement  that are not inconsistent with  the provisions thereof, provided that
such action will not, as evidenced by an opinion of counsel, adversely affect in
any material  respect the  interests of  the Certificateholders  of the  related
Series.  The Pooling and Servicing Agreement may  also be amended by the Seller,
the Master  Servicer  and  the  Trustee  with the  consent  of  the  holders  of
Certificates  evidencing  interests aggregating  not less  than  66 2/3%  of the
Voting Interests  evidenced  by  the  Certificates of  each  Class  or  Subclass
affected thereby, for the purpose of adding any provisions to or changing in any
manner  or  eliminating any  of  the provisions  of  such Pooling  and Servicing
Agreement or of modifying  in any manner the  rights of the  Certificateholders;
provided,  however, that  no such  amendment may  (i) reduce  in any  manner the
amount of, or delay the timing of, any payments
 
                                       57
<PAGE>
received on  or  with  respect  to  Mortgage  Loans  that  are  required  to  be
distributed  on  any Certificates,  without the  consent of  the holder  of such
Certificate, (ii) adversely affect in any material respect the interests of  the
holders  of a Class  or Subclass of Certificates  of a Series  in a manner other
than that  set  forth  in (i)  above  without  the consent  of  the  holders  of
Certificates aggregating not less than 66 2/3% of the Voting Interests evidenced
by  such  Class  or  Subclass,  or  (iii)  reduce  the  aforesaid  percentage of
Certificates of any  Class or  Subclass, the holders  of which  are required  to
consent   to  such  amendment,  without  the  consent  of  the  holders  of  all
Certificates  of   such   Class   or   Subclass   affected   then   outstanding.
Notwithstanding  the  foregoing,  the  Trustee  will  not  consent  to  any such
amendment if such amendment  would subject the Trust  Estate (or any  segregated
pool of assets therein) to tax or cause the Trust Estate (or any segregated pool
of assets therein) to fail to qualify as a REMIC.
 
TERMINATION; OPTIONAL PURCHASE OF MORTGAGE LOANS
 
    The  obligations created by the Pooling and Servicing Agreement for a Series
of Certificates  will terminate  on the  Distribution Date  following the  final
payment  or other liquidation of the last  Mortgage Loan subject thereto and the
disposition of all property acquired upon foreclosure of any such Mortgage Loan.
In no  event, however,  will the  trust  created by  the Pooling  and  Servicing
Agreement  continue beyond the expiration of 21 years from the death of the last
survivor of certain persons named in  such Pooling and Servicing Agreement.  For
each Series of Certificates, the Trustee will give written notice of termination
of  the Pooling and Servicing Agreement to each Certificateholder, and the final
distribution  will  be  made  only  upon  surrender  and  cancellation  of   the
Certificates at an office or agency appointed by the Seller and specified in the
notice of termination.
 
    If  so provided  in the  applicable Prospectus  Supplement, the  Pooling and
Servicing Agreement  for  each  Series  of Certificates  will  permit,  but  not
require, the Seller, Norwest Mortgage or such other party as is specified in the
applicable  Prospectus Supplement,  to purchase from  the Trust  Estate for such
Series all  remaining Mortgage  Loans at  the time  subject to  the Pooling  and
Servicing  Agreement at a price specified  in such Prospectus Supplement. In the
event that such  party has caused  the related Trust  Estate (or any  segregated
pool  of assets  therein) to be  treated as a  REMIC, any such  purchase will be
effected only pursuant to a "qualified  liquidation" as defined in Code  Section
860F(a)(4)(A)  and the receipt by the Trustee  of an opinion of counsel or other
evidence that such purchase will  not (i) result in the  imposition of a tax  on
"prohibited  transactions" under Code Section 860F(a)(1), (ii) otherwise subject
the Trust Estate to tax, or (iii) cause the Trust Estate (or any segregated pool
of assets) to fail to qualify as a REMIC. The exercise of such right will effect
early retirement  of  the Certificates  of  that Series,  but  the right  so  to
purchase  may be  exercised only  after the  aggregate principal  balance of the
Mortgage Loans for such Series at the time of purchase is less than a  specified
percentage  of  the aggregate  principal  balance at  the  Cut-Off Date  for the
Series, or after the date set forth in the applicable Prospectus Supplement.
 
THE TRUSTEE
 
    The Trustee under each Pooling and Servicing Agreement (the "Trustee")  will
be  named in the applicable Prospectus  Supplement. The commercial bank or trust
company serving as Trustee may have normal banking relationships with the Seller
or any of its affiliates.
 
    The Trustee may resign at any time, in which event the Master Servicer  will
be obligated to appoint a successor trustee. The Master Servicer may also remove
the  Trustee if the  Trustee ceases to be  eligible to act  as Trustee under the
Pooling and Servicing Agreement, if the Trustee becomes insolvent or in order to
change the situs of the Trust Estate for state tax reasons. Upon becoming  aware
of  such circumstances, the  Master Servicer will become  obligated to appoint a
successor trustee. The Trustee may also be removed at any time by the holders of
Certificates evidencing not less than 51%  of the Voting Interests in the  Trust
Estate,  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 Interest in the Trust Estate necessary
to effect any such removal has been obtained. Any resignation and removal of the
Trustee, and the appointment of a  successor trustee, will not become  effective
until   acceptance   of  such   appointment  by   the  successor   trustee.  The
 
                                       58
<PAGE>
Trustee, and any successor trustee, will have a combined capital and surplus  of
at  least  $50,000,000,  or will  be  a member  of  a bank  holding  system, the
aggregate combined  capital  and  surplus  of which  is  at  least  $50,000,000,
provided  that the Trustee's  and any such  successor trustee's 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, and will be subject to supervision
or examination by federal or state authorities.
 
                  CERTAIN LEGAL ASPECTS OF THE MORTGAGE LOANS
 
    The  following  discussion contains  summaries of  certain legal  aspects of
mortgage loans  which are  general in  nature. Because  such legal  aspects  are
governed  by applicable  state law  (which laws  may differ  substantially), the
summaries do not purport to be complete or to reflect the laws of any particular
state, nor to encompass  the laws of  all states in which  the security for  the
Mortgage  Loans is  situated. The summaries  are qualified in  their entirety by
reference to the applicable federal and state laws governing the Mortgage Loans.
 
GENERAL
 
    The Mortgage Loans will, in general, be secured by either first mortgages or
first deeds of  trust, depending upon  the prevailing practice  in the state  in
which  the underlying property  is located. A  mortgage creates a  lien upon the
real property described in  the mortgage. There are  two parties to a  mortgage:
the  mortgagor, who is the borrower (or, in  the case of a Mortgage Loan secured
by a property  that has been  conveyed to  an INTER VIVOS  revocable trust,  the
settlor  of such  trust); and the  mortgagee, who  is the lender.  In a mortgage
instrument state,  the  mortgagor delivers  to  the  mortgagee a  note  or  bond
evidencing  the loan and the mortgage. Although a  deed of trust is similar to a
mortgage, a  deed of  trust has  three parties:  a borrower  called the  trustor
(similar  to  a  mortgagor),  a  lender called  the  beneficiary  (similar  to a
mortgagee), and a third-party grantee called the trustee. Under a deed of trust,
the borrower grants the property, irrevocably until the debt is paid, in  trust,
generally  with a power of  sale, to the trustee to  secure payment of the loan.
The trustee's authority  under a  deed of  trust and  the mortgagee's  authority
under  a mortgage are governed by the express provisions of the deed of trust or
mortgage, applicable law, and, in some cases, with respect to the deed of trust,
the directions of the beneficiary.
 
FORECLOSURE
 
    Foreclosure of  a mortgage  is generally  accomplished by  judicial  action.
Generally,  the action is initiated  by the service of  legal pleadings upon all
parties having an interest of record in the real property. Delays in  completion
of  the  foreclosure  occasionally  may  result  from  difficulties  in locating
necessary parties  defendant.  When  the mortgagee's  right  of  foreclosure  is
contested,  the  legal  proceedings  necessary  to  resolve  the  issue  can  be
time-consuming. After the completion of  a judicial foreclosure proceeding,  the
court  may  issue a  judgment of  foreclosure  and appoint  a receiver  or other
officer to conduct the sale of the property. In some states, mortgages may  also
be  foreclosed by  advertisement, pursuant  to a power  of sale  provided in the
mortgage. Foreclosure of a mortgage  by advertisement is essentially similar  to
foreclosure of a deed of trust by non-judicial power of sale.
 
    Foreclosure  of a deed of trust  is generally accomplished by a non-judicial
trustee's sale under a specific provision  in the deed of trust that  authorizes
the  trustee to  sell the  property to  a third  party upon  any default  by the
borrower under the terms of the note  or deed of trust. In certain states,  such
foreclosure  also may be accomplished by  judicial action in the manner provided
for foreclosure of mortgages. In some  states, the trustee must record a  notice
of  default and send  a copy to the  borrower-trustor and to  any person who has
recorded a request  for a copy  of a notice  of default and  notice of sale.  In
addition, the trustee must provide notice in some states to any other individual
having  an  interest  of  record  in the  real  property,  including  any junior
lienholders. If the deed of trust  is not reinstated within any applicable  cure
period,  a notice of sale must be posted  in a public place and, in most states,
published for a specified period of time in one or more newspapers. In addition,
some state laws  require that  a copy of  the notice  of sale be  posted on  the
property and sent to all parties having an interest of record in the property.
 
                                       59
<PAGE>
    In  some states, the borrower-trustor has the right to reinstate the loan at
any time following default until shortly before the trustee's sale. In  general,
the  borrower,  or any  other person  having  a junior  encumbrance on  the real
estate, may,  during a  reinstatement period,  cure the  default by  paying  the
entire  amount in arrears plus the costs  and expenses incurred in enforcing the
obligation. Certain state laws  control the amount  of foreclosure expenses  and
costs, including attorneys' fees, which may be recovered by a lender.
 
    In  case of foreclosure under either a mortgage or a deed of trust, the sale
by the receiver  or other designated  officer, or  by the trustee,  is a  public
sale.  However, because of  the difficulty a  potential buyer at  the sale would
have in determining the exact status of title and because the physical condition
of the property may have deteriorated during the foreclosure proceedings, it  is
uncommon  for a third  party to purchase  the property at  the foreclosure sale.
Rather, it is common for the lender to purchase the property from the trustee or
receiver for an amount equal to the unpaid principal amount of the note, accrued
and unpaid interest and the expenses of foreclosure. Thereafter, subject to  the
right  of  the  borrower in  some  states  to remain  in  possession  during the
redemption period, the lender  will assume the  burdens of ownership,  including
obtaining  hazard insurance and  making such repairs  at its own  expense as are
necessary to render  the property suitable  for sale. The  lender commonly  will
obtain  the services of a real estate broker  and pay the broker a commission in
connection with the sale of the property. Depending upon market conditions,  the
ultimate  proceeds  of the  sale  of the  property  may not  equal  the lender's
investment in the property. Any loss may  be reduced by the receipt of  mortgage
insurance  proceeds, if any, or by judicial  action against the borrower for the
deficiency, if  such  action  is  permitted  by  law.  See  "--  Anti-Deficiency
Legislation and Other Limitations on Lenders" below.
 
FORECLOSURE ON SHARES OF COOPERATIVES
 
    The  cooperative shares owned  by the tenant-stockholder  and pledged to the
lender are, in  almost all  cases, subject to  restrictions on  transfer as  set
forth  in the cooperative's Certificate of Incorporation and By-laws, as well as
in the proprietary  lease or occupancy  agreement, and may  be cancelled by  the
cooperative  for  failure  by  the  tenant-stockholder  to  pay  rent  or  other
obligations or  charges owed  by such  tenant-stockholder, including  mechanics'
liens   against   the   cooperative   apartment   building   incurred   by  such
tenant-stockholder. The  proprietary  lease  or  occupancy  agreement  generally
permits  the cooperative to  terminate such lease  or agreement in  the event an
obligor fails  to make  payments or  defaults in  the performance  of  covenants
required  thereunder. Typically,  the lender  and the  cooperative enter  into a
recognition agreement  which  establishes the  rights  and obligations  of  both
parties  in the event of a default  by the tenant-stockholder on its obligations
under  the  proprietary  lease  or   occupancy  agreement.  A  default  by   the
tenant-stockholder  under  the  proprietary lease  or  occupancy  agreement will
usually constitute a default under the security agreement between the lender and
the tenant-stockholder.
 
    The recognition agreement  generally provides  that, in the  event that  the
tenant-stockholder  has  defaulted  under  the  proprietary  lease  or occupancy
agreement, the  cooperative will  take  no action  to  terminate such  lease  or
agreement until the lender has been provided an opportunity to cure the default.
The  recognition agreement typically  provides that if  the proprietary lease or
occupancy agreement is terminated, the  cooperative will recognize the  lender's
lien  against  proceeds  from  a sale  of  the  cooperative  apartment, subject,
however, to the cooperative's right to sums due under such proprietary lease  or
occupancy  agreement. The  total amount owed  to the cooperative  by the tenant-
stockholder, which the lender  generally cannot restrict  and does not  monitor,
could reduce the value of the collateral below the outstanding principal balance
of the cooperative loan and accrued and unpaid interest thereon.
 
    Recognition  agreements also provide that in the event of a foreclosure on a
cooperative loan,  the  lender  must  obtain the  approval  or  consent  of  the
cooperative  as  required  by  the  proprietary  lease  before  transferring the
cooperative shares or assigning the proprietary lease. Generally, the lender  is
not  limited  by the  agreement  in any  rights it  may  have to  dispossess the
tenant-stockholders.
 
                                       60
<PAGE>
    Foreclosure  on  the  cooperative  shares  is  accomplished  by  a  sale  in
accordance  with the provisions of Article 9 of the Uniform Commercial Code (the
"UCC") and the security agreement relating to those shares. Article 9 of the UCC
requires that a sale be conducted in a "commercially reasonable" manner. Whether
a foreclosure sale has been conducted in a "commercially reasonable" manner will
depend on the facts  in each case. In  determining commercial reasonableness,  a
court  will look to  the notice given  the debtor and  the method, manner, time,
place and terms of the foreclosure. Generally, a sale conducted according to the
usual practice of banks selling similar collateral will be considered reasonably
conducted.
 
    Article 9 of the UCC provides that the proceeds of the sale will be  applied
first  to  pay the  costs  and expenses  of  the sale  and  then to  satisfy the
indebtedness  secured  by  the  lender's  security  interest.  The   recognition
agreement,  however, generally provides that the lender's right to reimbursement
is subject to the right of the cooperative corporation to receive sums due under
the proprietary lease or occupancy  agreement. If there are proceeds  remaining,
the  lender must account to the  tenant-stockholder for the surplus. Conversely,
if a  portion of  the  indebtedness remains  unpaid, the  tenant-stockholder  is
generally  responsible for  the deficiency. See  "-- Anti-Deficiency Legislation
and Other Limitations on Lenders" below.
 
RIGHTS OF REDEMPTION
 
    In some states, after sale pursuant to a deed of trust and/or foreclosure of
a mortgage,  the borrower  and certain  foreclosed junior  lienors are  given  a
statutory  period in which to redeem the  property from the foreclosure sale. In
most states where the right of redemption is available, statutory redemption may
occur upon  payment of  the  foreclosure purchase  price, accrued  interest  and
taxes.  In some states, the right to redeem is an equitable right. The effect of
a right  of redemption  is  to delay  the  ability of  the  lender to  sell  the
foreclosed  property. The  exercise of  a right  of redemption  would defeat the
title of any  purchaser at  a foreclosure  sale, or  of any  purchaser from  the
lender  subsequent  to  judicial foreclosure  or  sale  under a  deed  of trust.
Consequently, the  practical effect  of the  redemption right  is to  force  the
lender  to maintain  the property  and pay the  expenses of  ownership until the
redemption period has run.
 
ANTI-DEFICIENCY LEGISLATION AND OTHER LIMITATIONS ON LENDERS
 
    Certain states have imposed statutory  restrictions that limit the  remedies
of  a beneficiary under a deed of trust or a mortgagee under a mortgage. In some
states, statutes limit  the right of  the beneficiary or  mortgagee to obtain  a
deficiency  judgment against the borrower following  foreclosure or sale under a
deed of trust. A deficiency judgment  is a personal judgment against the  former
borrower  equal in most  cases to the  difference between the  amount due to the
lender and the net amount realized upon the foreclosure sale.
 
    Some state statutes may require the beneficiary or mortgagee to exhaust  the
security afforded under a deed of trust or mortgage by foreclosure in an attempt
to satisfy the full debt before bringing a personal action against the borrower.
In certain other states, the lender has the option of bringing a personal action
against  the  borrower  on  the debt  without  first  exhausting  such security;
however, in  some  of these  states,  the  lender, following  judgment  on  such
personal  action, may be  deemed to have  elected a remedy  and may be precluded
from exercising  remedies  with  respect  to  the  security.  Consequently,  the
practical  effect of the election requirement,  when applicable, is that lenders
will usually proceed first against the security rather than bringing a  personal
action against the borrower.
 
    Other  statutory provisions  may limit  any deficiency  judgment against the
former borrower following a  foreclosure sale to the  excess of the  outstanding
debt  over the fair market value  of the property at the  time of such sale. The
purpose of  these statutes  is to  prevent  a beneficiary  or a  mortgagee  from
obtaining a large deficiency judgment against the former borrower as a result of
low or no bids at the foreclosure sale.
 
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<PAGE>
    In  some states, exceptions to the anti-deficiency statutes are provided for
in certain instances where the value of the lender's security has been  impaired
by  acts or omissions of the borrower, for example, in the event of waste of the
property.
 
    Generally, Article 9 of  the UCC governs  foreclosure on cooperative  shares
and  the related proprietary lease or occupancy agreement and foreclosure on the
beneficial interest in a land trust. Some courts have interpreted Section  9-504
of  the UCC to prohibit a deficiency  award unless the creditor establishes that
the sale of the  collateral (which, in  the case of a  Mortgage Loan secured  by
shares  of a cooperative, would be such shares and the related proprietary lease
or occupancy agreement) was conducted in a commercially reasonable manner.
 
    A Servicer generally will  not be required  under the applicable  Underlying
Servicing Agreement to pursue deficiency judgments on the Mortgage Loans even if
permitted by law.
 
    In  addition  to  anti-deficiency and  related  legislation,  numerous other
federal and state  statutory provisions, including  the federal bankruptcy  laws
and  state laws affording  relief to debtors,  may interfere with  or affect the
ability of a secured mortgage lender to realize upon its security. For  example,
numerous statutory provisions under the United States Bankruptcy Code, 11 U.S.C.
Sections  101 ET SEQ., (the "Bankruptcy Code")  may interfere with or affect the
ability of the  Seller to obtain  payment of  a Mortgage Loan,  to realize  upon
collateral  and/or  enforce a  deficiency judgment.  For example,  under federal
bankruptcy  law,  virtually  all  actions  (including  foreclosure  actions  and
deficiency  judgment proceedings) are automatically stayed  upon the filing of a
bankruptcy petition, and often no interest or principal payments are made during
the course of the  bankruptcy proceeding. In a  case under the Bankruptcy  Code,
the  secured party is precluded from  foreclosing without authorization from the
bankruptcy court. In addition, a court with federal bankruptcy jurisdiction  may
permit  a debtor  through his or  her Chapter  11 or Chapter  13 plan  to cure a
monetary default in  respect of a  Mortgage Loan by  paying arrearages within  a
reasonable  time  period  and  reinstating the  original  mortgage  loan payment
schedule even though the lender accelerated the mortgage loan and final judgment
of foreclosure had been entered in state court (provided no foreclosure sale had
yet occurred) prior  to the filing  of the debtor's  petition. Some courts  with
federal  bankruptcy jurisdiction  have approved  plans, based  on the particular
facts of the case, that effected the curing of a mortgage loan default by paying
arrearages over a number of years.
 
    If a  Mortgage Loan  is secured  by property  NOT consisting  solely of  the
debtor's  principal residence,  the Bankruptcy  Code also  permits such Mortgage
Loan to be modified. Such modifications may include reducing the amount of  each
monthly payment, changing the rate of interest, altering the repayment schedule,
and  reducing the lender's security interest to  the value of the property, thus
leaving the  lender in  the position  of a  general unsecured  creditor for  the
difference  between the value of the property and the outstanding balance of the
Mortgage Loan. Some courts have  permitted such modifications when the  Mortgage
Loan  is  secured  both by  the  debtor's  principal residence  and  by personal
property.
 
    If a court relieves a borrower's  obligation to repay amounts otherwise  due
on  a Mortgage Loan, the Servicer will  not be required to advance such amounts,
and any loss in respect thereof will be borne by the Certificateholders.
 
    The Internal Revenue Code of 1986, as amended, provides priority to  certain
tax  liens over  the lien of  the mortgage  or deed of  trust. The  laws of some
states provide priority to certain  tax liens over the  lien of the mortgage  or
deed  of trust. Numerous federal and  some state consumer protection laws impose
substantive  requirements  upon   mortgage  lenders  in   connection  with   the
origination, servicing and enforcement of mortgage loans. These laws include the
federal  Truth  in Lending  Act, Real  Estate  Settlement Procedures  Act, Equal
Credit Opportunity Act, Fair Credit Billing Act, Fair Credit Reporting Act,  and
related  statutes  and regulations.  These federal  laws  and state  laws impose
specific statutory liabilities  upon lenders who  originate or service  mortgage
loans and who fail to comply with the provisions of the law. In some cases, this
liability may affect assignees of the mortgage loans.
 
                                       62
<PAGE>
SOLDIERS' AND SAILORS' CIVIL RELIEF ACT AND SIMILAR LAWS
 
    Generally, under the terms of the Soldiers' and Sailors' Civil Relief Act of
1940,  as amended  (the "Relief  Act"), a  borrower who  enters military service
after the origination of such borrower's Mortgage Loan (including a borrower who
is a member of  the National Guard or  is in reserve status  at the time of  the
origination  of the Mortgage Loan and is later called to active duty) may not be
charged interest above an annual rate of 6% during the period of such borrower's
active duty status,  unless a  court orders  otherwise upon  application of  the
lender.  It  is  possible  that  such  action  could  have  an  effect,  for  an
indeterminate period of  time, on the  ability of the  Servicer to collect  full
amounts  of interest  on certain of  the Mortgage  Loans in a  Trust Estate. Any
shortfall in interest collections resulting  from the application of the  Relief
Act  could result in  losses to the  holders of the  Certificates of the related
Series. Further,  the Relief  Act  imposes limitations  which would  impair  the
ability  of the Servicer  to foreclose on  an affected Mortgage  Loan during the
borrower's period of active duty status. Thus, in the event that such a Mortgage
Loan goes  into  default, there  may  be delays  and  losses occasioned  by  the
inability  to realize upon  the Mortgaged Property in  a timely fashion. Certain
states have enacted comparable  legislation which may  interfere with or  affect
the ability of the Servicer to timely collect payments of principal and interest
on,  or to  foreclose on,  Mortgage Loans  of borrowers  in such  states who are
active or reserve members of the armed services.
 
ENVIRONMENTAL CONSIDERATIONS
 
    Under the  federal  Comprehensive Environmental  Response  Compensation  and
Liability  Act, as amended ("CERCLA"), and under  state law in certain states, a
secured party which takes a deed  in lieu of foreclosure, purchases a  mortgaged
property  at  a foreclosure  sale or  operates a  mortgaged property  may become
liable in  certain circumstances  for  the costs  of remedial  action  ("Cleanup
Costs")  if  hazardous  wastes or  hazardous  substances have  been  released or
disposed of on the  property. Such Cleanup Costs  may be substantial. Under  the
laws  of certain states, failure to perform the remediation required or demanded
by the state of any condition or  circumstance that (i) may pose an imminent  or
substantial  endangerment to  the public health  or welfare  or the environment,
(ii) may result in a release or threatened release of any hazardous  substances,
or  (iii) may give rise to any environmental  claim or demand may give rise to a
lien  on  the  property  to  ensure  the  reimbursement  of  Cleanup  Costs   (a
"Superlien").  All subsequent  liens on such  property are  subordinated to such
Superlien and, in  some states, even  prior recorded liens  are subordinated  to
such Superliens. In the latter states, the security interest of the Trustee in a
property that is subject to such a Superlien could be adversely affected.
 
    The  state of  the law  is currently  unclear as  to whether  and under what
circumstances Cleanup Costs, or the  obligation to take remedial actions,  could
be  imposed on a secured lender such as the Trust Estate. Under the laws of some
states and under CERCLA, a  lender may be liable as  an "owner or operator"  for
costs of addressing releases or threatened releases of hazardous substances on a
mortgaged  property if such lender or  its agents or employees have participated
in  the  management  of  the  operations  of  the  borrower,  even  though   the
environmental  damage or threat was caused by  a prior owner or current owner or
operator or other third  party. Excluded from CERCLA's  definition of "owner  or
operator,"  however, is a person "who without participating in the management of
the facility,  holds indicia  of  ownership primarily  to protect  his  security
interest"  (the "secured-creditor exemption").  This exemption for  holders of a
security interest such as a secured lender applies only when the lender seeks to
protect its security interest in the contaminated facility or property. Thus, if
a lender's  activities  begin to  encroach  on  the actual  management  of  such
facility  or  property, the  lender faces  potential liability  as an  "owner or
operator" under CERCLA. Similarly, when a lender forecloses and takes title to a
contaminated facility  or  property,  the  lender  may  incur  potential  CERCLA
liability  in various circumstances,  including among others,  when it holds the
facility or  property  as  an  investment (including  leasing  the  facility  or
property  to a third party), fails to market the property in a timely fashion or
fails to properly address environmental conditions at the property or facility.
 
                                       63
<PAGE>
    A decision  in May  1990  of the  United States  Court  of Appeals  for  the
Eleventh Circuit in UNITED STATES V. FLEET FACTORS CORP. very narrowly construed
CERCLA's  secured-creditor exemption. The court's opinion suggests that a lender
need not have involved  itself in the day-to-day  operations of the facility  or
participated in decisions relating to hazardous waste to be liable under CERCLA;
rather,  liability  could  attach  to  a  lender  if  its  involvement  with the
management of the  facility is broad  enough to support  the inference that  the
lender  had  the capacity  to influence  the  borrower's treatment  of hazardous
waste. The court  added that  a lender's  capacity to  influence such  decisions
could be inferred from the extent of its involvement in the facility's financial
management.  A subsequent decision by the United States Court of Appeals for the
Ninth Circuit in IN RE BERGSOE METAL CORP., apparently disagreeing with, but not
expressly contradicting, the FLEET FACTORS court, held that a secured lender had
no liability absent "some actual management of the facility" on the part of  the
lender.  On April  29, 1992, the  United States  Environmental Protection Agency
(the  "EPA")  issued  a  final   rule  interpreting  and  delineating   CERCLA's
secured-creditor  exemption and  the range  of permissible  actions that  may be
undertaken by a holder of a  contaminated facility without exceeding the  bounds
of  the secured-creditor exemption. On February 4, 1994, the United States Court
of Appeals for the District of Columbia Circuit in KELLEY V. EPA invalidated the
EPA rule. As a result of the KELLEY  case, the state of the law with respect  to
the  secured creditor  exemption remains unclear.  In addition, even  if the EPA
rule or a replacement  were to be  reinstated, the EPA  rule or its  replacement
would  not necessarily affect the potential for liability in actions by either a
state or a private party under CERCLA or in actions under other federal or state
laws which may impose liability on "owners or operators" but do not  incorporate
the secured-creditor exemption. Traditionally, residential mortgage lenders have
not taken steps to evaluate whether hazardous wastes or hazardous substances are
present  with respect to any mortgaged property  prior to the origination of the
mortgage  loan  or  prior  to   foreclosure  or  accepting  a  deed-in-lieu   of
foreclosure.  Accordingly,  neither  the Seller,  Norwest  Mortgage  nor Norwest
Funding has  made such  evaluations prior  to the  origination of  the  Mortgage
Loans,   nor  does  Norwest  Mortgage  or  Norwest  Funding  require  that  such
evaluations be made by originators who  have sold the Mortgage Loans to  Norwest
Mortgage.  Neither the Seller nor Norwest  Mortgage is required to undertake any
such  evaluations  prior   to  foreclosure  or   accepting  a  deed-in-lieu   of
foreclosure.   Neither   the  Seller   nor   the  Master   Servicer   makes  any
representations or  warranties or  assumes  any liability  with respect  to  the
absence  or effect of hazardous wastes  or hazardous substances on any Mortgaged
Property or any  casualty resulting  from the  presence or  effect of  hazardous
wastes  or hazardous  substances. See  "The Trust  Estates --  Mortgage Loans --
Representations  and  Warranties"  and  "Servicing  of  the  Mortgage  Loans  --
Enforcement  of Due-on-Sale Clauses; Realization  Upon Defaulted Mortgage Loans"
above.
 
"DUE-ON-SALE" CLAUSES
 
    The forms  of note,  mortgage and  deed of  trust relating  to  conventional
Mortgage Loans may contain a "due-on-sale" clause permitting acceleration of the
maturity  of a loan if  the borrower transfers its  interest in the property. In
recent  years,  court  decisions  and  legislative  actions  placed  substantial
restrictions  on the right  of lenders to  enforce such clauses  in many states.
However, effective  October  15,  1982, Congress  enacted  the  Garn-St  Germain
Depository  Institutions Act of 1982 (the  "Garn Act") which purports to preempt
state laws which prohibit the enforcement of "due-on-sale" clauses by  providing
among  other matters, that  "due-on-sale" clauses in  certain loans (which loans
may include the Mortgage Loans)  made after the effective  date of the Garn  Act
are enforceable, within certain limitations as set forth in the Garn Act and the
regulations  promulgated thereunder. "Due-on-sale" clauses contained in mortgage
loans originated by  federal savings  and loan associations  or federal  savings
banks  are fully  enforceable pursuant  to regulations  of the  Office of Thrift
Supervision ("OTS"), as successor to the Federal Home Loan Bank Board ("FHLBB"),
which preempt  state  law  restrictions  on the  enforcement  of  such  clauses.
Similarly,  "due-on-sale" clauses in  mortgage loans made  by national banks and
federal  credit  unions  are  now  fully  enforceable  pursuant  to   preemptive
regulations  of the  Comptroller of the  Currency and the  National Credit Union
Administration, respectively.
 
                                       64
<PAGE>
    The  Garn  Act  created  a  limited  exemption  from  its  general  rule  of
enforceability  for  "due-on-sale" clauses  in  certain mortgage  loans ("Window
Period Loans") which were originated by non-federal lenders and made or  assumed
in  certain states ("Window Period States")  during the period, prior to October
15, 1982,  in  which that  state  prohibited the  enforcement  of  "due-on-sale"
clauses  by constitutional provision,  statute or statewide  court decision (the
"Window Period"). Though neither the Garn  Act nor the OTS regulations  actually
names  the Window Period States, the  Federal Home Loan Mortgage Corporation has
taken the  position,  in  prescribing mortgage  loan  servicing  standards  with
respect  to mortgage loans which it has purchased, that the Window Period States
were:  Arizona,  Arkansas,  California,   Colorado,  Georgia,  Iowa,   Michigan,
Minnesota,  New Mexico, Utah and Washington. Under the Garn Act, unless a Window
Period State took action by October 15,  1985, the end of the Window Period,  to
further  regulate enforcement of  "due-on-sale" clauses in  Window Period Loans,
"due-on-sale" clauses would become enforceable even in Window Period Loans. Five
of the Window Period States (Arizona, Minnesota, Michigan, New Mexico and  Utah)
have taken actions which restrict the enforceability of "due-on-sale" clauses in
Window  Period Loans beyond October 15, 1985.  The actions taken vary among such
states.
 
    By virtue  of  the  Garn Act,  a  Servicer  may generally  be  permitted  to
accelerate  any conventional Mortgage Loan which contains a "due-on-sale" clause
upon transfer of an interest in the property subject to the mortgage or deed  of
trust.  With respect to any Mortgage Loan  secured by a residence occupied or to
be occupied  by the  borrower, this  ability  to accelerate  will not  apply  to
certain  types of transfers, including (i)  the granting of a leasehold interest
which has a term of three years or less and which does not contain an option  to
purchase,  (ii) a transfer to a relative resulting from the death of a borrower,
or a transfer where the  spouse or children become an  owner of the property  in
each  case where  the transferee(s) will  occupy the property,  (iii) a transfer
resulting from a decree of  dissolution of marriage, legal separation  agreement
or  from an incidental property settlement agreement by which the spouse becomes
an owner of  the property,  (iv) the  creation of  a lien  or other  encumbrance
subordinate  to  the lender's  security instrument  which does  not relate  to a
transfer of rights  of occupancy  in the property  (provided that  such lien  or
encumbrance  is not created pursuant to a  contract for deed), (v) a transfer by
devise, descent or operation of law on the death of a joint tenant or tenant  by
the entirety, (vi) a transfer into an INTER VIVOS trust in which the borrower is
the  beneficiary and which does not relate to a transfer of rights of occupancy;
and (vii) other  transfers as  set forth  in the  Garn Act  and the  regulations
thereunder.  The extent of the  effect of the Garn Act  on the average lives and
delinquency rates of the Mortgage Loans cannot be predicted. See "Prepayment and
Yield Considerations."
 
APPLICABILITY OF USURY LAWS
 
    Title V of the Depository Institutions Deregulation and Monetary Control Act
of  1980,  enacted  in  March  1980  ("Title  V"),  provides  that  state  usury
limitations shall not apply to certain types of residential first mortgage loans
originated  by certain lenders after March 31, 1980. The OTS as successor to the
FHLBB  is   authorized  to   issue  rules   and  regulations   and  to   publish
interpretations governing implementation of Title V.  The statute authorized any
state  to reimpose interest rate limits by  adopting before April 1, 1983, a law
or constitutional provision which expressly  rejects application of the  federal
law.  Fifteen  states have  adopted laws  reimposing or  reserving the  right to
reimpose interest  rate  limits. In  addition,  even where  Title  V is  not  so
rejected,  any state is  authorized to adopt a  provision limiting certain other
loan charges.
 
    The Seller will represent and warrant in the Pooling and Servicing Agreement
to the Trustee for the benefit of Certificateholders that all Mortgage Loans are
originated in full compliance with applicable state laws, including usury  laws.
See  "The Pooling and Servicing Agreement -- Assignment of Mortgage Loans to the
Trustee."
 
ENFORCEABILITY OF CERTAIN PROVISIONS
 
    Standard forms  of  note,  mortgage  and deed  of  trust  generally  contain
provisions  obligating the  borrower to  pay a late  charge if  payments are not
timely made and in some circumstances may provide
 
                                       65
<PAGE>
for prepayment fees or penalties if the obligation is paid prior to maturity. In
certain states, there are or may be specific limitations upon late charges which
a lender may  collect from a  borrower for delinquent  payments. Certain  states
also  limit  the  amounts  that a  lender  may  collect from  a  borrower  as an
additional charge  if the  loan  is prepaid.  Under  the Pooling  and  Servicing
Agreement,  late charges and prepayment fees (to the extent permitted by law and
not waived  by the  Servicer) will  be retained  by the  Servicer as  additional
servicing compensation.
 
    Courts  have imposed  general equitable  principles upon  foreclosure. These
equitable principles are  generally designed  to relieve the  borrower from  the
legal effect of defaults under the loan documents. Examples of judicial remedies
that  may be fashioned  include judicial requirements  that the lender undertake
affirmative and expensive  actions to  determine the causes  for the  borrower's
default and the likelihood that the borrower will be able to reinstate the loan.
In  some cases, courts have substituted their judgment for the lender's judgment
and have required  lenders to  reinstate loans  or recast  payment schedules  to
accommodate  borrowers who are suffering from temporary financial disability. In
some cases, courts have limited the right of lenders to foreclose if the default
under the mortgage instrument is not  monetary, such as the borrower failing  to
adequately  maintain the property or the borrower executing a second mortgage or
deed of trust  affecting the  property. In other  cases, some  courts have  been
faced  with  the issue  of whether  federal  or state  constitutional provisions
reflecting due process concerns for adequate notice require that borrowers under
the deeds of  trust receive  notices in addition  to the  statutorily-prescribed
minimum  requirements. For  the most  part, these  cases have  upheld the notice
provisions as being reasonable or have found that the sale by a trustee under  a
deed  of trust  or under  a mortgage  having a  power of  sale does  not involve
sufficient state action to afford constitutional protections to the borrower.
 
                    CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
    The following  general  discussion  represents the  opinion  of  Cadwalader,
Wickersham & Taft as to the anticipated material federal income tax consequences
of the purchase, ownership and disposition of Certificates. The discussion below
does  not purport  to address  all federal income  tax consequences  that may be
applicable to particular categories of investors,  some of which may be  subject
to  special rules. The authorities on which this discussion is based are subject
to change or differing  interpretations, and any  such change or  interpretation
could apply retroactively. This discussion reflects the applicable provisions of
the  Code, as well  as regulations (the "REMIC  Regulations") promulgated by the
U.S. Department of the Treasury on  December 23, 1992. Investors should  consult
their  own tax advisors in  determining the federal, state,  local and any other
tax  consequences  to  them  of  the  purchase,  ownership  and  disposition  of
Certificates.
 
    For  purposes of this discussion, where the applicable Prospectus Supplement
provides for a  Fixed Retained Yield  with respect  to the Mortgage  Loans of  a
Series of Certificates, references to the Mortgage Loans will be deemed to refer
to  that portion of  the Mortgage Loans held  by the Trust  Estate that does not
include   the   Fixed   Retained   Yield.   References   to   a   "Holder"    or
"Certificateholder"  in this discussion generally mean the beneficial owner of a
Certificate.
 
             FEDERAL INCOME TAX CONSEQUENCES FOR REMIC CERTIFICATES
 
GENERAL
 
    With respect to a particular Series of Certificates, an election may be made
to treat the Trust Estate or one  or more segregated pools of assets therein  as
one  or more REMICs within the meaning of Code Section 860D. A Trust Estate or a
portion or portions thereof as to which one or more REMIC elections will be made
will be  referred  to  as a  "REMIC  Pool."  For purposes  of  this  discussion,
Certificates  of a Series as  to which one or more  REMIC elections are made are
referred to as "REMIC Certificates" and will  consist of one or more Classes  of
"Regular  Certificates" and one Class of  "Residual Certificates" in the case of
each REMIC  Pool. Qualification  as  a REMIC  requires ongoing  compliance  with
certain   conditions.  With  respect  to  each  Series  of  REMIC  Certificates,
Cadwalader,
 
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<PAGE>
Wickersham & Taft, counsel  to the Seller,  has advised the  Seller that in  the
firm's  opinion,  assuming  (i)  the making  of  an  appropriate  election, (ii)
compliance with the Pooling and  Servicing Agreement, and (iii) compliance  with
any  changes in  the law,  including any  amendments to  the Code  or applicable
Treasury regulations thereunder,  each REMIC Pool  will qualify as  a REMIC.  In
such case, the Regular Certificates will be considered to be "regular interests"
in  the REMIC Pool and generally will be treated for federal income tax purposes
as if they were newly originated debt instruments, and the Residual Certificates
will be considered to be "residual interests" in the REMIC Pool. The  Prospectus
Supplement  for each  Series of Certificates  will indicate whether  one or more
REMIC elections with respect to the related Trust Estate will be made, in  which
event  references to "REMIC" or "REMIC Pool"  herein shall be deemed to refer to
each such REMIC Pool.
 
STATUS OF REMIC CERTIFICATES
 
    REMIC Certificates held by a mutual savings bank or a domestic building  and
loan  association will  constitute "qualifying  real property  loans" within the
meaning of Code Section 593(d)(1) in the same proportion that the assets of  the
REMIC  Pool would be so treated. REMIC  Certificates held by a domestic building
and loan association will constitute "a regular or residual interest in a REMIC"
within the meaning  of Code  Section 7701(a)(19)(C)(xi) in  the same  proportion
that  the assets of  the REMIC Pool  would be treated  as "loans...secured by an
interest in real property" within the meaning of Code Section  7701(a)(19)(C)(v)
or  as other assets described in Code Section 7701(a)(19)(C). REMIC Certificates
held by a  real estate  investment trust  will constitute  "real estate  assets"
within  the meaning  of Code Section  856(c)(5)(A), and interest  on the Regular
Certificates and income with respect to Residual Certificates will be considered
"interest on obligations secured by mortgages  on real property or on  interests
in  real property" within the  meaning of Code Section  856(c)(3)(B) in the same
proportion that, for both  purposes, the assets  of the REMIC  Pool would be  so
treated. If at all times 95% or more of the assets of the REMIC Pool qualify for
each  of the foregoing  treatments, the REMIC Certificates  will qualify for the
corresponding status in their entirety. For purposes of Code Sections  593(d)(1)
and  856(c)(5)(A), payments of principal and interest on the Mortgage Loans that
are reinvested pending distribution to holders of REMIC Certificates qualify for
such treatment. Where two REMIC Pools are a part of a tiered structure they will
be treated as  one REMIC for  purposes of the  tests described above  respecting
asset  ownership of  more or less  than 95%. In  addition, if the  assets of the
REMIC include Buy-Down Loans, it is possible that the percentage of such  assets
constituting "qualifying real property loans" or "loans...secured by an interest
in real property" for purposes of Code Sections 593(d)(1) and 7701(a)(19)(C)(v),
respectively,  may  be required  to  be reduced  by  the amount  of  the related
Buy-Down Funds. REMIC Certificates held  by a regulated investment company  will
not  constitute  "Government  securities"  within the  meaning  of  Code Section
851(b)(4)(A)(i). REMIC Certificates held by certain financial institutions  will
constitute  an "evidence  of indebtedness"  within the  meaning of  Code Section
582(c)(1).
 
QUALIFICATION AS A REMIC
 
    In order for the  REMIC Pool to  qualify as a REMIC,  there must be  ongoing
compliance  on the part of the REMIC Pool with the requirements set forth in the
Code. The REMIC Pool  must fulfill an  asset test, which  requires that no  more
than  a DE MINIMIS portion of  the assets of the REMIC  Pool, as of the close of
the third calendar month beginning after  the "Startup Day" (which for  purposes
of this discussion is the date of issuance of the REMIC Certificates) and at all
times  thereafter, may  consist of assets  other than  "qualified mortgages" and
"permitted investments." The REMIC Regulations provide a safe harbor pursuant to
which the DE  MINIMIS requirement  will be  met if  at all  times the  aggregate
adjusted  basis of  the nonqualified  assets is  less than  1% of  the aggregate
adjusted basis of all the REMIC Pool's assets. An entity that fails to meet  the
safe harbor may nevertheless demonstrate that it holds no more than a DE MINIMIS
amount  of  nonqualified  assets. A  REMIC  Pool also  must  provide "reasonable
arrangements" to prevent its residual interests from being held by "disqualified
organizations" or agents thereof and must furnish applicable tax information  to
transferors  or agents that violate this  requirement. See "Taxation of Residual
Certificates -- Tax-Related Restrictions on Transfer of Residual Certificates --
Disqualified Organizations."
 
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<PAGE>
    A qualified mortgage  is any obligation  that is principally  secured by  an
interest  in real property and  that is either transferred  to the REMIC Pool on
the Startup Day or is  purchased by the REMIC  Pool within a three-month  period
thereafter  pursuant to  a fixed  price contract in  effect on  the Startup Day.
Qualified mortgages include whole  mortgage loans, such  as the Mortgage  Loans,
and,  generally, certificates  of beneficial  interest in  a grantor  trust that
holds mortgage loans and regular interests in another REMIC, such as  lower-tier
regular  interests in a  tiered REMIC. The REMIC  Regulations specify that loans
secured by timeshare  interests and  shares held by  a tenant  stockholder in  a
cooperative housing corporation can be qualified mortgages. A qualified mortgage
includes a qualified replacement mortgage, which is any property that would have
been treated as a qualified mortgage if it were transferred to the REMIC Pool on
the  Startup Day and that  is received either (i)  in exchange for any qualified
mortgage within  a three-month  period  thereafter or  (ii)  in exchange  for  a
"defective  obligation"  within  a  two-year  period  thereafter.  A  "defective
obligation" includes  (i)  a mortgage  in  default or  as  to which  default  is
reasonably  foreseeable, (ii) a mortgage as  to which a customary representation
or warranty made at the  time of transfer to the  REMIC Pool has been  breached,
(iii)  a mortgage that  was fraudulently procured  by the mortgagor,  and (iv) a
mortgage that was not in fact principally secured by real property (but only  if
such  mortgage is disposed of within 90 days of discovery). A Mortgage Loan that
is "defective" as described in  clause (iv) that is not  sold or, if within  two
years of the Startup Day, exchanged, within 90 days of discovery, ceases to be a
qualified mortgage after such 90-day period.
 
    Permitted  investments  include  cash  flow  investments,  qualified reserve
assets, and  foreclosure property.  A  cash flow  investment is  an  investment,
earning  a return  in the  nature of  interest, of  amounts received  on or with
respect to qualified mortgages for a temporary period, not exceeding 13  months,
until the next scheduled distribution to holders of interests in the REMIC Pool.
A qualified reserve asset is any intangible property held for investment that is
part  of any reasonably required reserve maintained by the REMIC Pool to provide
for payments of  expenses of the  REMIC Pool or  amounts due on  the regular  or
residual  interests in  the event of  defaults (including  delinquencies) on the
qualified  mortgages,  lower  than  expected  reinvestment  returns,  prepayment
interest  shortfalls and certain  other contingencies. The  reserve fund will be
disqualified if more than 30% of the  gross income from the assets in such  fund
for  the year is derived from the sale or other disposition of property held for
less than three  months, unless  required to prevent  a default  on the  regular
interests caused by a default on one or more qualified mortgages. A reserve fund
must  be reduced "promptly and appropriately"  as payments on the Mortgage Loans
are received. Foreclosure property is real  property acquired by the REMIC  Pool
in  connection with the default or imminent  default of a qualified mortgage and
generally held  for not  more than  two years,  with extensions  granted by  the
Internal Revenue Service.
 
    In  addition to the foregoing requirements, the various interests in a REMIC
Pool also must meet certain requirements. All  of the interests in a REMIC  Pool
must be either of the following: (i) one or more classes of regular interests or
(ii)  a single class of  residual interests on which  distributions, if any, are
made pro rata. A regular interest is an interest in a REMIC Pool that is  issued
on  the Startup Day with  fixed terms, is designated  as a regular interest, and
unconditionally entitles the holder to receive a specified principal amount  (or
other  similar amount),  and provides that  interest payments  (or other similar
amounts), if any, at or before maturity either are payable based on a fixed rate
or a qualified variable rate, or  consist of a specified, nonvarying portion  of
the  interest  payments on  qualified mortgages.  Such  a specified  portion may
consist of a  fixed number  of basis  points, a  fixed percentage  of the  total
interest,  or a  qualified variable  rate, inverse  variable rate  or difference
between two fixed or qualified  variable rates on some  or all of the  qualified
mortgages.  The specified principal  amount of a  regular interest that provides
for interest payments consisting of a specified, nonvarying portion of  interest
payments  on qualified mortgages may be zero. A residual interest is an interest
in a REMIC Pool other than a regular interest that is issued on the Startup  Day
and  that is designated as a residual interest.  An interest in a REMIC Pool may
be treated as a regular interest even  if payments of principal with respect  to
such  interest are  subordinated to payments  on other regular  interests or the
residual interest  in  the REMIC  Pool,  and are  dependent  on the  absence  of
defaults or delinquencies on
 
                                       68
<PAGE>
qualified  mortgages or  permitted investments,  lower than  reasonably expected
returns on permitted investments, unanticipated  expenses incurred by the  REMIC
Pool or prepayment interest shortfalls. Accordingly, the Regular Certificates of
a  Series will  constitute one  or more  classes of  regular interests,  and the
Residual Certificates with respect to that Series will constitute a single class
of residual interests on which distributions are made pro rata.
 
    If an entity, such as  the REMIC Pool, fails to  comply with one or more  of
the  ongoing requirements of the Code for  REMIC status during any taxable year,
the Code provides that the entity will not  be treated as a REMIC for such  year
and  thereafter. In  this event,  an entity  with multiple  classes of ownership
interests may be  treated as  a separate  association taxable  as a  corporation
under  Treasury  regulations, and  the Regular  Certificates  may be  treated as
equity interests therein. The Code, however, authorizes the Treasury  Department
to  issue regulations that address situations where  failure to meet one or more
of the requirements for REMIC status occurs inadvertently and in good faith, and
disqualification of  the  REMIC  Pool  would  occur  absent  regulatory  relief.
Investors  should be aware, however, that the Conference Committee Report to the
Tax Reform  Act of  1986  (the "1986  Act") indicates  that  the relief  may  be
accompanied  by sanctions, such as the imposition of a corporate tax on all or a
portion of  the  REMIC  Pool's income  for  the  period of  time  in  which  the
requirements for REMIC status are not satisfied.
 
TAXATION OF REGULAR CERTIFICATES
 
    GENERAL
 
    In  general, interest,  original issue  discount, and  market discount  on a
Regular Certificate  will be  treated as  ordinary  income to  a holder  of  the
Regular Certificate (the "Regular Certificateholder"), and principal payments on
a  Regular Certificate will be  treated as a return of  capital to the extent of
the Regular  Certificateholder's  basis  in the  Regular  Certificate  allocable
thereto.  Regular Certificateholders must  use the accrual  method of accounting
with regard  to Regular  Certificates, regardless  of the  method of  accounting
otherwise used by such Regular Certificateholders.
 
    ORIGINAL ISSUE DISCOUNT
 
    Compound  Interest  Certificates  will  be,  and  other  classes  of Regular
Certificates may be, issued with "original issue discount" within the meaning of
Code Section 1273(a). Holders of any  Class or Subclass of Regular  Certificates
having original issue discount generally must include original issue discount in
ordinary  income for  federal income tax  purposes as it  accrues, in accordance
with a  constant interest  method that  takes into  account the  compounding  of
interest,  in advance of  receipt of the  cash attributable to  such income. The
following  discussion  is  based  in  part  on  temporary  and  final   Treasury
regulations  issued on February 2, 1994, as  amended on June 14, 1996, (the "OID
Regulations") under Code Sections 1271 through 1273 and 1275 and in part on  the
provisions of the 1986 Act. Regular Certificateholders should be aware, however,
that  the OID Regulations  do not adequately address  certain issues relevant to
prepayable securities,  such as  the Regular  Certificates. To  the extent  such
issues  are not addressed in  such regulations, the Seller  intends to apply the
methodology described in  the Conference Committee  Report to the  1986 Act.  No
assurance  can be  provided that  the Internal Revenue  Service will  not take a
different position  as to  those  matters not  currently  addressed by  the  OID
Regulations.  Moreover, the OID Regulations  include an anti-abuse rule allowing
the Internal Revenue Service to apply  or depart from the OID Regulations  where
necessary  or appropriate  to ensure  a reasonable  tax result  in light  of the
applicable  statutory  provisions.   A  tax  result   will  not  be   considered
unreasonable under the anti-abuse rule in the absence of a substantial effect on
the  present  value of  a  taxpayer's tax  liability.  Investors are  advised to
consult their own tax advisors as  to the discussion herein and the  appropriate
method  for reporting interest  and original issue discount  with respect to the
Regular Certificates.
 
    Each Regular Certificate (except to the extent described below with  respect
to  a  Regular  Certificate  on  which  principal  is  distributed  in  a single
installment or by  lots of  specified principal amounts  upon the  request of  a
Certificateholder  or  by random  lot (a  "Non-Pro  Rata Certificate"))  will be
treated as  a single  installment  obligation for  purposes of  determining  the
original issue discount
 
                                       69
<PAGE>
includible in a Regular Certificateholder's income. The total amount of original
issue  discount on a Regular Certificate is the excess of the "stated redemption
price at maturity" of the Regular Certificate over its "issue price." The  issue
price  of a  Class of Regular  Certificates offered pursuant  to this Prospectus
generally is the first price at which a substantial amount of such Class is sold
to the  public  (excluding  bond houses,  brokers  and  underwriters).  Although
unclear  under the OID Regulations, the Seller  intends to treat the issue price
of a Class as to which there is no substantial sale as of the issue date or that
is retained by the Seller as the fair market value of that Class as of the issue
date. The issue price of a Regular Certificate also includes any amount paid  by
an  initial Regular  Certificateholder for  accrued interest  that relates  to a
period prior to the  issue date of the  Regular Certificate, unless the  Regular
Certificateholder elects on its federal income tax return to exclude such amount
from  the issue  price and  to recover  it on  the first  Distribution Date. The
stated redemption price at maturity of a Regular Certificate always includes the
original principal amount  of the  Regular Certificate, but  generally will  not
include  distributions of  interest if such  distributions constitute "qualified
stated interest." Under the OID Regulations, qualified stated interest generally
means interest payable at a single fixed  rate or a qualified variable rate  (as
described  below)  provided  that  such  interest  payments  are unconditionally
payable at intervals of one year or  less during the entire term of the  Regular
Certificate.  Because  there is  no penalty  or  default remedy  in the  case of
nonpayment of interest  with respect to  a Regular Certificate,  it is  possible
that  no  interest on  any  Class of  Regular  Certificates will  be  treated as
qualified stated interest. However,  except as provided  in the following  three
sentences  or in  the applicable  Prospectus Supplement,  because the underlying
Mortgage Loans provide for remedies in the event of default, the Seller  intends
to  treat interest with respect to  the Regular Certificates as qualified stated
interest. Distributions of interest  on a Compound  Interest Certificate, or  on
other  Regular Certificates with respect to which deferred interest will accrue,
will not  constitute  qualified  stated  interest,  in  which  case  the  stated
redemption   price  at  maturity  of  such  Regular  Certificates  includes  all
distributions of interest  as well  as principal thereon.  Likewise, the  Seller
intends  to  treat  an interest-only  Class  or  a Class  on  which  interest is
substantially  disproportionate   to   its   principal   amount   (a   so-called
"super-premium"  Class)  as  having  no  qualified  stated  interest.  Where the
interval between the  issue date and  the first Distribution  Date on a  Regular
Certificate  is shorter than the interval between subsequent Distribution Dates,
the interest attributable to the additional days will be included in the  stated
redemption price at maturity.
 
    Under  a DE MINIMIS  rule, original issue discount  on a Regular Certificate
will be considered to be zero if such original issue discount is less than 0.25%
of the stated redemption price at maturity of the Regular Certificate multiplied
by the weighted average maturity of  the Regular Certificate. For this  purpose,
the  weighted average maturity of the Regular Certificate is computed as the sum
of the  amounts  determined by  multiplying  the  number of  full  years  (I.E.,
rounding  down partial  years) from  the issue  date until  each distribution in
reduction of stated redemption price  at maturity is scheduled  to be made by  a
fraction,  the numerator of which is the amount of each distribution included in
the stated  redemption price  at maturity  of the  Regular Certificate  and  the
denominator  of which is the stated redemption  price at maturity of the Regular
Certificate. The Conference Committee Report to  the 1986 Act provides that  the
schedule  of  such distributions  should be  determined  in accordance  with the
assumed rate of prepayment of  the Mortgage Loans (the "Prepayment  Assumption")
and  the  anticipated  reinvestment  rate,  if  any,  relating  to  the  Regular
Certificates. The  Prepayment Assumption  with respect  to a  Series of  Regular
Certificates  will be set forth in the applicable Prospectus Supplement. Holders
generally must report DE MINIMIS original  issue discount pro rata as  principal
payments  are received,  and such  income will  be capital  gain if  the Regular
Certificate is held  as a  capital asset.  Under the  OID Regulations,  however,
Regular  Certificateholders may  elect to accrue  all DE  MINIMIS original issue
discount as well as market discount and market premium, under the constant yield
method. See "Election to Treat All Interest Under the Constant Yield Method."
 
    A Regular Certificateholder generally must  include in gross income for  any
taxable  year the sum of the "daily portions," as defined below, of the original
issue discount on the Regular Certificate  accrued during an accrual period  for
each  day  on which  it holds  the  Regular Certificate,  including the  date of
purchase but  excluding the  date  of disposition.  The  Seller will  treat  the
monthly period ending
 
                                       70
<PAGE>
on  the day before each Distribution Date as the accrual period. With respect to
each Regular  Certificate, a  calculation will  be made  of the  original  issue
discount  that accrues  during each successive  full accrual  period (or shorter
period from the date of original issue) that ends on the day before the  related
Distribution Date on the Regular Certificate. The Conference Committee Report to
the  1986 Act  states that  the rate  of accrual  of original  issue discount is
intended to be based on the Prepayment Assumption. Other than as discussed below
with respect to a Non-Pro Rata Certificate, the original issue discount accruing
in a full accrual period would be the excess, if any, of (i) the sum of (a)  the
present  value of all of  the remaining distributions to  be made on the Regular
Certificate as of the end of that accrual period, and (b) the distributions made
on the Regular Certificate  during the accrual period  that are included in  the
Regular  Certificate's  stated  redemption  price  at  maturity,  over  (ii) the
adjusted issue price of the Regular Certificate at the beginning of the  accrual
period.  The present  value of  the remaining  distributions referred  to in the
preceding sentence  is calculated  based on  (i) the  yield to  maturity of  the
Regular   Certificate  at  the   issue  date,  (ii)   events  (including  actual
prepayments) that have  occurred prior  to the end  of the  accrual period,  and
(iii) the Prepayment Assumption. For these purposes, the adjusted issue price of
a  Regular Certificate at the  beginning of any accrual  period equals the issue
price of the Regular Certificate, increased by the aggregate amount of  original
issue discount with respect to the Regular Certificate that accrued in all prior
accrual  periods  and reduced  by the  amount of  distributions included  in the
Regular Certificate's stated redemption price at maturity that were made on  the
Regular  Certificate in such prior periods. The original issue discount accruing
during any accrual period (as determined in this paragraph) will then be divided
by the number of days in the  period to determine the daily portion of  original
issue  discount for each day  in the period. With  respect to an initial accrual
period shorter than a full accrual period, the daily portions of original  issue
discount  must be  determined according to  an appropriate  allocation under any
reasonable method.
 
    Under the  method described  above,  the daily  portions of  original  issue
discount  required  to  be included  in  income by  a  Regular Certificateholder
generally will  increase  to  take  into  account  prepayments  on  the  Regular
Certificates  as a result of  prepayments on the Mortgage  Loans that exceed the
Prepayment Assumption, and generally will decrease  (but not below zero for  any
period)  if  the  prepayments  are slower  than  the  Prepayment  Assumption. An
increase in  prepayments on  the Mortgage  Loans  with respect  to a  Series  of
Regular  Certificates can result in  both a change in  the priority of principal
payments with respect to certain Classes  of Regular Certificates and either  an
increase  or  decrease in  the daily  portions of  original issue  discount with
respect to such Regular Certificates.
 
    In the case of a Non-Pro  Rata Certificate, the Seller intends to  determine
the  yield to  maturity of such  Certificate based upon  the anticipated payment
characteristics of the  Class as  a whole  under the  Prepayment Assumption.  In
general,  the original issue discount accruing  on each Non-Pro Rata Certificate
in a full  accrual period would  be its  allocable share of  the original  issue
discount  with respect to the entire Class, as determined in accordance with the
preceding paragraph. However, in the case of a distribution in retirement of the
entire unpaid principal balance of any  Non-Pro Rata Certificate (or portion  of
such  unpaid  principal balance),  (a)  the remaining  unaccrued  original issue
discount allocable to such Certificate (or  to such portion) will accrue at  the
time  of  such distribution,  and  (b) the  accrual  of original  issue discount
allocable to each remaining Certificate of  such Class (or the remaining  unpaid
principal  balance  of a  partially redeemed  Non-Pro  Rata Certificate  after a
distribution of principal has  been received) will be  adjusted by reducing  the
present  value of the  remaining payments on  such Class and  the adjusted issue
price of such  Class to the  extent attributable  to the portion  of the  unpaid
principal  balance thereof  that was distributed.  The Seller  believes that the
foregoing treatment is consistent  with the "pro rata  prepayment" rules of  the
OID  Regulations,  but  with the  rate  of  accrual of  original  issue discount
determined based  on  the  Prepayment  Assumption for  the  Class  as  a  whole.
Investors are advised to consult their tax advisors as to this treatment.
 
                                       71
<PAGE>
    ACQUISITION PREMIUM
 
    A  purchaser of a Regular  Certificate at a price  greater than its adjusted
issue price  but less  than its  stated  redemption price  at maturity  will  be
required  to include in  gross income the  daily portions of  the original issue
discount on  the  Regular  Certificate  reduced pro  rata  by  a  fraction,  the
numerator  of which is the excess of its purchase price over such adjusted issue
price and  the  denominator of  which  is the  excess  of the  remaining  stated
redemption  price at maturity over the adjusted issue price. Alternatively, such
a subsequent purchaser may elect to treat all such acquisition premium under the
constant yield method, as described below  under the heading "Election to  Treat
All Interest Under the Constant Yield Method."
 
    VARIABLE RATE REGULAR CERTIFICATES
 
    Regular  Certificates may  provide for  interest based  on a  variable rate.
Under the OID Regulations, interest is treated as payable at a variable rate if,
generally, (i) the issue price does not exceed the original principal balance by
more than a specified amount  and (ii) the interest  compounds or is payable  at
least  annually at current values of (a) one or more "qualified floating rates,"
(b) a single fixed rate and one  or more qualified floating rates, (c) a  single
"objective rate," or (d) a single fixed rate and a single objective rate that is
a  "qualified inverse  floating rate." A  floating rate is  a qualified floating
rate  if  variations  in  the  rate  can  reasonably  be  expected  to   measure
contemporaneous  variations in the cost of newly borrowed funds, where such rate
is subject to a fixed multiple that is greater than 0.65 but not more than 1.35.
Such rate may also be increased or decreased  by a fixed spread or subject to  a
fixed  cap or floor, or a cap or floor that is not reasonably expected as of the
issue date to  affect the yield  of the instrument  significantly. An  objective
rate is any rate (other than a qualified floating rate) that is determined using
a  single fixed  formula and  that is based  on objective  financial or economic
information, provided that such information is not (i) within the control of the
issuer or a related party or (ii) unique to the circumstances of the issuer or a
related party. A qualified inverse floating rate is a rate equal to a fixed rate
minus  a  qualified  floating  rate  that  inversely  reflects   contemporaneous
variations in the cost of newly borrowed funds; an inverse floating rate that is
not  a qualified inverse floating rate may  nevertheless be an objective rate. A
Class of Regular Certificates may be issued under this Prospectus that does  not
have  a variable rate under the foregoing rules, for example, a Class that bears
different rates at different times during the period it is outstanding such that
it is  considered  significantly  "front-loaded"  or  "back-loaded"  within  the
meaning  of  the  OID Regulations.  It  is possible  that  such a  Class  may be
considered  to  bear  "contingent  interest"  within  the  meaning  of  the  OID
Regulations.  The OID Regulations, as they relate to the treatment of contingent
interest, are by their terms not applicable to Regular Certificates. However, if
final regulations  dealing  with contingent  interest  with respect  to  Regular
Certificates  apply the same principles as the OID Regulations, such regulations
may lead to different timing  of income inclusion than  would be the case  under
the  OID Regulations. Furthermore, application of  such principles could lead to
the characterization  of  gain  on  the  sale  of  contingent  interest  Regular
Certificates  as ordinary  income. Investors  should consult  their tax advisors
regarding the appropriate treatment of any Regular Certificate that does not pay
interest at a fixed rate or variable rate as described in this paragraph.
 
    Under the REMIC Regulations, a Regular  Certificate (i) bearing a rate  that
qualifies  as a variable rate under the  OID Regulations that is tied to current
values of a  variable rate (or  the highest, lowest  or average of  two or  more
variable  rates, including a rate  based on the average cost  of funds of one or
more financial institutions), or a positive or negative multiple of such a  rate
(plus  or  minus a  specified  number of  basis  points), or  that  represents a
weighted average of rates on some or all of the Mortgage Loans, including such a
rate that is subject to one or more caps or floors, or (ii) bearing one or  more
such  variable rates for one or more periods, or one or more fixed rates for one
or more periods, and a different variable rate or fixed rate for other  periods,
qualifies  as  a  regular interest  in  a REMIC.  Accordingly,  unless otherwise
indicated in the applicable Prospectus  Supplement, the Seller intends to  treat
Regular  Certificates that qualify  as regular interests under  this rule in the
same manner as obligations bearing a  variable rate for original issue  discount
reporting purposes.
 
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<PAGE>
    The  amount of original issue discount with respect to a Regular Certificate
bearing a variable rate  of interest will accrue  in the manner described  above
under  "Original Issue Discount," with the yield to maturity and future payments
on such Regular Certificate generally to be determined by assuming that interest
will be payable for  the life of  the Regular Certificate  based on the  initial
rate  (or, if  different, the value  of the  applicable variable rate  as of the
pricing date) for the  relevant Class. Unless  required otherwise by  applicable
final  regulations,  the  Seller  intends to  treat  such  variable  interest as
qualified stated interest, other than  variable interest on an interest-only  or
super-premium  Class,  which will  be treated  as non-qualified  stated interest
includible  in  the  stated  redemption  price  at  maturity.  Ordinary   income
reportable  for any period will  be adjusted based on  subsequent changes in the
applicable interest rate index.
 
    Although unclear under  the OID  Regulations, unless  required otherwise  by
applicable  final regulations, the Seller  intends to treat Regular Certificates
bearing an interest rate that is a weighted average of the net interest rates on
Mortgage Loans as having  qualified stated interest, except  to the extent  that
initial  "teaser" rates cause sufficiently "back-loaded" interest to create more
than DE MINIMIS original issue discount. The yield on such Regular  Certificates
for  purposes of accruing  original issue discount will  be a hypothetical fixed
rate based on the  fixed rates, in  the case of fixed  rate Mortgage Loans,  and
initial  "teaser  rates"  followed  by  fully  indexed  rates,  in  the  case of
adjustable rate Mortgage Loans. In the  case of adjustable rate Mortgage  Loans,
the applicable index used to compute interest on the Mortgage Loans in effect on
the  pricing date (or  possibly the issue date)  will be deemed  to be in effect
beginning with the period  in which the first  weighted average adjustment  date
occurring  after the issue date occurs. Adjustments will be made in each accrual
period either increasing or decreasing the amount of ordinary income  reportable
to reflect the actual Pass-Through Rate on the Regular Certificates.
 
    MARKET DISCOUNT
 
    A  purchaser of  a Regular  Certificate also  may be  subject to  the market
discount rules of Code Sections 1276 through 1278. Under these sections and  the
principles  applied  by the  OID Regulations  in the  context of  original issue
discount, "market  discount" is  the amount  by which  the purchaser's  original
basis  in the Regular Certificate (i)  is exceeded by the then-current principal
amount of the Regular Certificate, or (ii) in the case of a Regular  Certificate
having  original issue discount, is exceeded by the adjusted issue price of such
Regular Certificate at the  time of purchase. Such  purchaser generally will  be
required  to recognize ordinary income to  the extent of accrued market discount
on such Regular Certificate as distributions includible in the stated redemption
price at maturity  thereof are  received, in an  amount not  exceeding any  such
distribution.  Such market discount would  accrue in a manner  to be provided in
Treasury regulations and should take into account the Prepayment Assumption. The
Conference Committee Report to the 1986 Act provides that until such regulations
are issued, such  market discount  would accrue  either (i)  on the  basis of  a
constant interest rate, or (ii) in the ratio of stated interest allocable to the
relevant  period to the sum  of the interest for  such period plus the remaining
interest as of the end of such period,  or in the case of a Regular  Certificate
issued  with original  issue discount, in  the ratio of  original issue discount
accrued for  the relevant  period to  the  sum of  the original  issue  discount
accrued for such period plus the remaining original issue discount as of the end
of  such  period. Such  purchaser also  generally  will be  required to  treat a
portion of any gain on a sale or exchange of the Regular Certificate as ordinary
income to the extent of the market  discount accrued to the date of  disposition
under  one of the foregoing methods, less any accrued market discount previously
reported as ordinary income as partial distributions in reduction of the  stated
redemption  price at maturity were received.  Such purchaser will be required to
defer deduction of a portion  of the excess of the  interest paid or accrued  on
indebtedness  incurred  to  purchase or  carry  a Regular  Certificate  over the
interest distributable thereon. The deferred portion of such interest expense in
any taxable year generally  will not exceed the  accrued market discount on  the
Regular  Certificate for  such year. Any  such deferred interest  expense is, in
general, allowed as a  deduction not later  than the year  in which the  related
market  discount income is recognized or the Regular Certificate is disposed of.
As an alternative to the inclusion of market discount in income on the foregoing
basis, the Regular Certificateholder may elect
 
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<PAGE>
to include  market discount  in income  currently as  it accrues  on all  market
discount  instruments acquired by such Regular Certificateholder in that taxable
year or thereafter, in which case the interest deferral rule will not apply. See
"Election to Treat All Interest Under the Constant Yield Method" below regarding
an alternative manner in which such election may be deemed to be made.
 
    By analogy to the OID Regulations, market discount with respect to a Regular
Certificate will be considered to be zero  if such market discount is less  than
0.25%  of  the remaining  stated redemption  price at  maturity of  such Regular
Certificate  multiplied  by  the  weighted  average  maturity  of  the   Regular
Certificate  (determined  as  described  above  in  the  third  paragraph  under
"Original Issue Discount") remaining after the date of purchase. It appears that
DE MINIMIS market discount would be reported  in a manner similar to DE  MINIMIS
original   issue  discount.  See  "Original   Issue  Discount"  above.  Treasury
regulations implementing the market discount rules have not yet been issued, and
therefore  investors  should  consult  their  own  tax  advisors  regarding  the
application  of  these rules.  Investors should  also consult  Revenue Procedure
92-67 concerning the elections  to include market  discount in income  currently
and to accrue market discount on the basis of the constant yield method.
 
    PREMIUM
 
    A  Regular Certificate purchased at a cost greater than its remaining stated
redemption price  at maturity  generally  is considered  to  be purchased  at  a
premium.  If the Regular  Certificateholder holds such  Regular Certificate as a
"capital  asset"  within  the  meaning   of  Code  Section  1221,  the   Regular
Certificateholder  may elect  under Code  Section 171  to amortize  such premium
under  the  constant  yield  method.  Such  election  will  apply  to  all  debt
obligations  acquired by the Regular Certificateholder at a premium held in that
taxable year or thereafter, unless revoked  with the permission of the  Internal
Revenue  Service. The  Conference Committee Report  to the 1986  Act indicates a
Congressional intent that  the same rules  that apply to  the accrual of  market
discount  on installment obligations will also  apply to amortizing bond premium
under  Code  Section  171  on  installment  obligations  such  as  the   Regular
Certificates,  although it is  unclear whether the  alternatives to the constant
interest  method  described  above   under  "Market  Discount"  are   available.
Amortizable  bond premium will be  treated as an offset  to interest income on a
Regular Certificate, rather than as a separate deduction item. See "Election  to
Treat  All  Interest  Under  the  Constant  Yield  Method"  below  regarding  an
alternative manner in which the  Code Section 171 election  may be deemed to  be
made.
 
    ELECTION TO TREAT ALL INTEREST UNDER THE CONSTANT YIELD METHOD
 
    A  holder of a  debt instrument such  as a Regular  Certificate may elect to
treat all  interest that  accrues on  the instrument  using the  constant  yield
method,  with none of  the interest being treated  as qualified stated interest.
For purposes of applying the constant yield method to a debt instrument  subject
to  such an  election, (i) "interest"  includes stated  interest, original issue
discount, DE MINIMIS  original issue  discount, market discount  and DE  MINIMIS
market  discount, as  adjusted by  any amortizable  bond premium  or acquisition
premium and (ii) the debt instrument is treated as if the instrument were issued
on the holder's acquisition  date in the amount  of the holder's adjusted  basis
immediately  after acquisition.  It is  unclear whether,  for this  purpose, the
initial Prepayment Assumption  would continue to  apply or if  a new  prepayment
assumption  as of  the date  of the holder's  acquisition would  apply. A holder
generally may make such an election on an instrument by instrument basis or  for
a  class or  group of  debt instruments.  However, if  the holder  makes such an
election with respect to a debt instrument with amortizable bond premium or with
market discount, the holder  is deemed to have  made elections to amortize  bond
premium  or to report market  discount income currently as  it accrues under the
constant yield  method,  respectively, for  all  premium bonds  held  or  market
discount  bonds acquired by the  holder in the same  taxable year or thereafter.
The election is made on the holder's  federal income tax return for the year  in
which  the  debt  instrument is  acquired  and  is irrevocable  except  with the
approval of the Internal Revenue Service. Investors should consult their own tax
advisors regarding the advisability of making such an election.
 
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<PAGE>
    TREATMENT OF LOSSES
 
    Regular Certificateholders will be required to report income with respect to
Regular Certificates on the accrual method of accounting, without giving  effect
to   delays  or  reductions   in  distributions  attributable   to  defaults  or
delinquencies on the Mortgage Loans, except to the extent it can be  established
that  such  losses  are  uncollectible. Accordingly,  the  holder  of  a Regular
Certificate, particularly a  Subordinated Certificate, may  have income, or  may
incur a diminution in cash flow as a result of a default or delinquency, but may
not  be  able to  take a  deduction (subject  to the  discussion below)  for the
corresponding loss until a  subsequent taxable year.  In this regard,  investors
are  cautioned that while they may generally  cease to accrue interest income if
it reasonably  appears that  the interest  will be  uncollectible, the  Internal
Revenue Service may take the position that original issue discount must continue
to  be accrued  in spite  of its uncollectibility  until the  debt instrument is
disposed of in a taxable transaction or becomes worthless in accordance with the
rules of Code Section 166. To the extent the rules of Code Section 166 regarding
bad debts are applicable,  it appears that  Regular Certificateholders that  are
corporations  or that otherwise hold the Regular Certificates in connection with
a trade or business should in general  be allowed to deduct as an ordinary  loss
such loss with respect to principal sustained during the taxable year on account
of  any such  Regular Certificates becoming  wholly or  partially worthless, and
that, in general, Regular  Certificateholders that are  not corporations and  do
not  hold the Regular Certificates in connection with a trade or business should
be allowed to deduct as a short-term capital loss any loss sustained during  the
taxable  year on account of a portion  of any such Regular Certificates becoming
wholly worthless. Although the matter is not free from doubt, such non-corporate
Regular Certificateholders should be allowed a  bad debt deduction at such  time
as  the principal  balance of  such Regular  Certificates is  reduced to reflect
losses resulting  from  any  liquidated Mortgage  Loans.  The  Internal  Revenue
Service,  however, could  take the position  that non-corporate  holders will be
allowed a bad debt deduction to reflect such losses only after all the  Mortgage
Loans remaining in the Trust Estate have been liquidated or the applicable Class
of Regular Certificates has been otherwise retired. The Internal Revenue Service
could  also assert that losses on  the Regular Certificates are deductible based
on some other method  that may defer  such deductions for  all holders, such  as
reducing  future cash  flow for purposes  of computing  original issue discount.
This may have the  effect of creating "negative"  original issue discount  which
would  be deductible  only against  future positive  original issue  discount or
otherwise upon termination of the Class. Regular Certificateholders are urged to
consult their  own tax  advisors regarding  the appropriate  timing, amount  and
character of any loss sustained with respect to such Regular Certificates. While
losses  attributable  to  interest  previously  reported  as  income  should  be
deductible as ordinary losses by  both corporate and non-corporate holders,  the
Internal  Revenue  Service may  take the  position  that losses  attributable to
accrued original issue discount  may only be deducted  as capital losses in  the
case  of  non-corporate holders  who  do not  hold  the Regular  Certificates in
connection with a trade or business. Special loss rules are applicable to  banks
and  thrift institutions, including rules regarding reserves for bad debts. Such
taxpayers are advised to consult their  tax advisors regarding the treatment  of
losses on Regular Certificates.
 
    SALE OR EXCHANGE OF REGULAR CERTIFICATES
 
    If a Regular Certificateholder sells or exchanges a Regular Certificate, the
Regular  Certificateholder will recognize gain or  loss equal to the difference,
if any,  between the  amount received  and  its adjusted  basis in  the  Regular
Certificate.  The adjusted basis  of a Regular  Certificate generally will equal
the cost of  the Regular Certificate  to the seller,  increased by any  original
issue  discount or  market discount  previously included  in the  seller's gross
income with respect to the Regular  Certificate and reduced by amounts  included
in  the stated redemption price at maturity of the Regular Certificate that were
previously received  by  the  seller,  by  any  amortized  premium  and  by  any
recognized losses.
 
    Except  as described  above with respect  to market discount,  and except as
provided in  this paragraph,  any gain  or loss  on the  sale or  exchange of  a
Regular Certificate realized by an investor who holds the Regular Certificate as
a  capital  asset  will  be  capital  gain or  loss  and  will  be  long-term or
 
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<PAGE>
short-term depending on whether  the Regular Certificate has  been held for  the
long-term capital gain holding period (currently, more than one year). Such gain
will  be treated as ordinary income (i) if a Regular Certificate is held as part
of a "conversion  transaction" as  defined in Code  Section 1258(c),  up to  the
amount  of interest that  would have accrued  on the Regular Certificateholder's
net investment  in  the  conversion  transaction  at  120%  of  the  appropriate
applicable  Federal rate under  Code Section 1274(d)  in effect at  the time the
taxpayer entered into  the transaction  minus any amount  previously treated  as
ordinary  income with respect to any prior disposition of property that was held
as part of such transaction,  (ii) in the case  of a non-corporate taxpayer,  to
the  extent such taxpayer has  made an election under  Code Section 163(d)(4) to
have net capital gains taxed as  investment income at ordinary income rates,  or
(iii)  to the extent that such  gain does not exceed the  excess, if any, of (a)
the amount that would have been includible in the gross income of the holder  if
its  yield on such Regular Certificate were  110% of the applicable Federal rate
as of the date of purchase, over (b) the amount of income actually includible in
the gross income  of such holder  with respect to  such Regular Certificate.  In
addition,  gain or  loss recognized  from the sale  of a  Regular Certificate by
certain banks or thrift institutions will be treated as ordinary income or  loss
pursuant  to Code Section 582(c). Pursuant  to the Revenue Reconciliation Act of
1993, capital gains of  certain non-corporate taxpayers are  subject to a  lower
maximum  tax rate than ordinary  income of such taxpayers.  The maximum tax rate
for corporations is the  same with respect to  both ordinary income and  capital
gains.
 
TAXATION OF RESIDUAL CERTIFICATES
 
    TAXATION OF REMIC INCOME
 
    Generally,  the "daily portions" of REMIC taxable income or net loss will be
includible as ordinary income or loss in determining the federal taxable  income
of  holders of Residual Certificates ("Residual Holders"), and will not be taxed
separately to the REMIC Pool. The daily portions of REMIC taxable income or  net
loss  of a Residual Holder are determined by allocating the REMIC Pool's taxable
income or net loss for each calendar quarter ratably to each day in such quarter
and by allocating such daily portion among the Residual Holders in proportion to
their respective holdings  of Residual Certificates  in the REMIC  Pool on  such
day.  REMIC taxable  income is  generally determined in  the same  manner as the
taxable income of an individual using  the accrual method of accounting,  except
that  (i) the  limitations on deductibility  of investment  interest expense and
expenses for the production of income do  not apply, (ii) all bad loans will  be
deductible  as business bad debts, and (iii) the limitation on the deductibility
of interest and  expenses related  to tax-exempt  income will  apply. The  REMIC
Pool's  gross  income includes  interest,  original issue  discount  income, and
market discount income, if any, on  the Mortgage Loans, reduced by  amortization
of  any premium on  the Mortgage Loans,  plus income from  amortization of issue
premium, if any,  on the Regular  Certificates, plus income  on reinvestment  of
cash flows and reserve assets, plus any cancellation of indebtedness income upon
allocation  of realized  losses to  the Regular  Certificates. The  REMIC Pool's
deductions include interest and original  issue discount expense on the  Regular
Certificates,  servicing  fees  on  the  Mortgage  Loans,  other  administrative
expenses of  the REMIC  Pool and  realized  losses on  the Mortgage  Loans.  The
requirement  that Residual Holders report their pro rata share of taxable income
or net loss of the REMIC Pool  will continue until there are no Certificates  of
any class of the related Series outstanding.
 
    The  taxable income recognized by a Residual Holder in any taxable year will
be affected by,  among other  factors, the  relationship between  the timing  of
recognition of interest and original issue discount or market discount income or
amortization of premium with respect to the Mortgage Loans, on the one hand, and
the  timing of  deductions for interest  (including original  issue discount) or
income from amortization of  issue premium on the  Regular Certificates, on  the
other  hand. In the event that an interest  in the Mortgage Loans is acquired by
the REMIC Pool at a discount, and one or more of such Mortgage Loans is prepaid,
the Residual  Holder may  recognize  taxable income  without being  entitled  to
receive a corresponding amount of cash because (i) the prepayment may be used in
whole  or in  part to  make distributions  in reduction  of principal  or Stated
Amount on the Regular Certificates, and (ii) the discount on the Mortgage  Loans
which  is  includible  in income  may  exceed  the deduction  allowed  upon such
distributions on those Regular Certificates on account of any unaccrued original
 
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<PAGE>
issue discount relating to those Regular  Certificates. When there is more  than
one  Class  of Regular  Certificates that  distribute  principal or  payments in
reduction  of  Stated  Amount  sequentially,  this  mismatching  of  income  and
deductions is particularly likely to occur in the early years following issuance
of  the Regular  Certificates when  distributions in  reduction of  principal or
Stated  Amount  are  being  made  in  respect  of  earlier  Classes  of  Regular
Certificates  to the  extent that such  Classes are not  issued with substantial
discount or are issued at  a premium. If taxable  income attributable to such  a
mismatching  is realized, in general, losses would  be allowed in later years as
distributions on the later  maturing Classes of  Regular Certificates are  made.
Taxable  income may also  be greater in earlier  years than in  later years as a
result of the fact that interest  expense deductions, expressed as a  percentage
of  the outstanding principal  amount of such a  Series of Regular Certificates,
may increase over  time as  distributions in  reduction of  principal or  Stated
Amount  are made on the lower yielding Classes of Regular Certificates, whereas,
to the extent  the REMIC Pool  consists of fixed  rate Mortgage Loans,  interest
income with respect to any given Mortgage Loan will remain constant over time as
a  percentage of  the outstanding principal  amount of  that loan. Consequently,
Residual Holders must have sufficient other sources of cash to pay any  federal,
state,  or local income taxes  due as a result  of such mismatching or unrelated
deductions against which  to offset such  income, subject to  the discussion  of
"excess  inclusions" below under "-- Limitations on Offset or Exemption of REMIC
Income." The timing of  such mismatching of income  and deductions described  in
this  paragraph, if present with respect to a Series of Certificates, may have a
significant adverse effect upon a Residual Holder's after-tax rate of return. In
addition, a Residual Holder's taxable  income during certain periods may  exceed
the income reflected by such Residual Holder for such periods in accordance with
generally  accepted accounting  principles. Investors  should consult  their own
accountants concerning the accounting treatment of their investment in  Residual
Certificates.
 
    BASIS AND LOSSES
 
    The  amount of any net loss of the REMIC Pool that may be taken into account
by the  Residual  Holder  is limited  to  the  adjusted basis  of  the  Residual
Certificate  as  of the  close of  the quarter  (or time  of disposition  of the
Residual Certificate if earlier), determined without taking into account the net
loss for the quarter. The  initial adjusted basis of  a purchaser of a  Residual
Certificate  is the  amount paid  for such  Residual Certificate.  Such adjusted
basis will  be increased  by the  amount of  taxable income  of the  REMIC  Pool
reportable  by the Residual Holder  and will be decreased  (but not below zero),
first, by a cash distribution from the REMIC Pool and, second, by the amount  of
loss  of the  REMIC Pool  reportable by  the Residual  Holder. Any  loss that is
disallowed on account of this limitation  may be carried over indefinitely  with
respect  to the Residual Holder  as to whom such loss  was disallowed and may be
used by such Residual  Holder only to  offset any income  generated by the  same
REMIC Pool.
 
    A Residual Holder will not be permitted to amortize directly the cost of its
Residual  Certificate as  an offset to  its share  of the taxable  income of the
related REMIC Pool. However, that taxable income will not include cash  received
by  the REMIC Pool that  represents a recovery of the  REMIC Pool's basis in its
assets. Such  recovery of  basis  by the  REMIC Pool  will  have the  effect  of
amortization  of the issue  price of the Residual  Certificates over their life.
However, in view of the possible acceleration of the income of Residual  Holders
described  above under "Taxation of REMIC Income," the period of time over which
such issue price is effectively amortized  may be longer than the economic  life
of the Residual Certificates.
 
    A Residual Certificate may have a negative value if the net present value of
anticipated tax liabilities exceeds the present value of anticipated cash flows.
The  REMIC  Regulations appear  to  treat the  issue  price of  such  a residual
interest as zero rather  than such negative amount  for purposes of  determining
the  REMIC Pool's  basis in  its assets. The  preamble to  the REMIC Regulations
states that the  Internal Revenue  Service may  provide future  guidance on  the
proper  tax  treatment of  payments  made by  a  transferor of  such  a residual
interest to induce the transferee to acquire the interest, and Residual  Holders
should consult their own tax advisors in this regard.
 
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<PAGE>
    Further,  to the extent that the initial adjusted basis of a Residual Holder
(other than an original holder) in the Residual Certificate is greater than  the
corresponding  portion  of the  REMIC Pool's  basis in  the Mortgage  Loans, the
Residual Holder will not  recover a portion of  such basis until termination  of
the   REMIC  Pool  unless  future  Treasury  regulations  provide  for  periodic
adjustments to the REMIC income otherwise  reportable by such holder. The  REMIC
Regulations  currently in effect do not so provide. See "-- Treatment of Certain
Items of REMIC Income and Expense -- Market Discount" below regarding the  basis
of  Mortgage  Loans  to the  REMIC  Pool and  "Sale  or Exchange  of  a Residual
Certificate" below regarding possible  treatment of a  loss upon termination  of
the REMIC Pool as a capital loss.
 
    TREATMENT OF CERTAIN ITEMS OF REMIC INCOME AND EXPENSE
 
    Although  the  Seller  intends  to  compute  REMIC  income  and  expense  in
accordance with the Code and  applicable regulations, the authorities  regarding
the  determination  of  specific items  of  income  and expense  are  subject to
differing interpretations. The Seller makes no representation as to the specific
method that it will use for reporting income with respect to the Mortgage  Loans
and  expenses with  respect to  the Regular  Certificates and  different methods
could result in different timing of reporting  of taxable income or net loss  to
Residual Holders or differences in capital gain versus ordinary income.
 
    ORIGINAL ISSUE DISCOUNT AND PREMIUM.  Generally, the REMIC Pool's deductions
for  original issue discount and income  from amortization of issue premium will
be determined in the  same manner as original  issue discount income on  Regular
Certificates  as  described above  under  "Taxation of  Regular  Certificates --
Original Issue Discount"  and "-- Variable  Rate Regular Certificates,"  without
regard to the DE MINIMIS rule described therein, and "-- Premium."
 
    MARKET DISCOUNT.  The REMIC Pool will have market discount income in respect
of  Mortgage Loans if, in general, the basis  of the REMIC Pool in such Mortgage
Loans is exceeded by their unpaid principal balances. The REMIC Pool's basis  in
such  Mortgage Loans is  generally the fair  market value of  the Mortgage Loans
immediately after the transfer thereof to the REMIC Pool. The REMIC  Regulations
provide  that such basis  is equal in the  aggregate to the  issue prices of all
regular and residual interests  in the REMIC Pool.  The accrued portion of  such
market discount would be recognized currently as an item of ordinary income in a
manner  similar  to original  issue discount.  Market discount  income generally
should  accrue  in  the  manner  described  above  under  "Taxation  of  Regular
Certificates -- Market Discount."
 
    PREMIUM.   Generally, if the  basis of the REMIC  Pool in the Mortgage Loans
exceeds the unpaid principal balances thereof, the REMIC Pool will be considered
to have acquired such Mortgage  Loans at a premium equal  to the amount of  such
excess.  As stated above, the  REMIC Pool's basis in  Mortgage Loans is the fair
market value of the Mortgage Loans, based  on the aggregate of the issue  prices
of  the regular and residual  interests in the REMIC  Pool immediately after the
transfer thereof to  the REMIC  Pool. In a  manner analogous  to the  discussion
above under "Taxation of Regular Certificates -- Premium," a person that holds a
Mortgage  Loan as a capital  asset under Code Section  1221 may elect under Code
Section 171 to amortize premium on Mortgage Loans originated after September 27,
1985 under the constant yield method.  Amortizable bond premium will be  treated
as an offset to interest income on the Mortgage Loans, rather than as a separate
deduction  item. Because  substantially all  of the  mortgagors on  the Mortgage
Loans are expected to be individuals, Code Section 171 will not be available for
premium on Mortgage Loans originated on or prior to September 27, 1985.  Premium
with  respect to  such Mortgage  Loans may  be deductible  in accordance  with a
reasonable method regularly employed  by the holder  thereof. The allocation  of
such premium pro rata among principal payments should be considered a reasonable
method; however, the Internal Revenue Service may argue that such premium should
be  allocated in a different manner, such as allocating such premium entirely to
the final payment of principal.
 
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<PAGE>
    LIMITATIONS ON OFFSET OR EXEMPTION OF REMIC INCOME
 
    Except in the case of certain thrift institutions, a portion (or all) of the
REMIC taxable income includible in determining the federal income tax  liability
of  a  Residual  Holder will  be  subject  to special  treatment.  That portion,
referred to as the "excess inclusion," is  equal to the excess of REMIC  taxable
income  for the  calendar quarter allocable  to a Residual  Certificate over the
daily accruals for such quarterly period of (i) 120% of the long-term applicable
Federal rate that would have applied to  the Residual Certificate (if it were  a
debt  instrument) on the  Startup Day under Code  Section 1274(d), multiplied by
(ii) the adjusted issue price of  such Residual Certificate at the beginning  of
such  quarterly period. For this purpose, the adjusted issue price of a Residual
Certificate at the beginning  of a quarter  is the issue  price of the  Residual
Certificate, plus the amount of such daily accruals of REMIC income described in
this  paragraph for all prior quarters, decreased by any distributions made with
respect to such Residual  Certificate prior to the  beginning of such  quarterly
period. Accordingly, the portion of the REMIC Pool's taxable income that will be
treated  as excess  inclusions will be  a larger  portion of such  income as the
adjusted issue price of the Residual Certificates diminishes.
 
    The portion of a  Residual Holder's REMIC taxable  income consisting of  the
excess inclusions generally may not be offset by other deductions, including net
operating  loss carryforwards, on such Residual Holder's return. Further, if the
Residual Holder is  an organization  subject to  the tax  on unrelated  business
income imposed by Code Section 511, the Residual Holder's excess inclusions will
be  treated as  unrelated business  taxable income  of such  Residual Holder for
purposes of Code Section  511. In addition, REMIC  taxable income is subject  to
30% withholding tax with respect to certain persons who are not U.S. Persons (as
defined   below  under   "Tax-Related  Restrictions  on   Transfer  of  Residual
Certificates -- Foreign  Investors"), and  the portion  thereof attributable  to
excess  inclusions is not eligible for any  reduction in the rate of withholding
tax (by treaty  or otherwise).  See "Taxation  of Certain  Foreign Investors  --
Residual  Certificates" below. Finally,  if a real estate  investment trust or a
regulated investment company owns a  Residual Certificate, a portion  (allocated
under  Treasury regulations  yet to  be issued)  of dividends  paid by  the real
estate investment trust or regulated investment  company could not be offset  by
net  operating losses of  its shareholders, would  constitute unrelated business
taxable  income  for  tax-exempt  shareholders,  and  would  be  ineligible  for
reduction of withholding to certain persons who are not U.S. Persons.
 
    An  exception  to  the  inability  of a  Residual  Holder  to  offset excess
inclusions with unrelated deductions  and net operating  losses applies to  Code
Section  593 institutions ("thrift institutions"). For purposes of applying this
rule, all  members of  an  affiliated group  filing  a consolidated  return  are
treated  as one taxpayer, except that  thrift institutions to which Code Section
593 applies,  together  with their  subsidiaries  formed to  issue  REMICs,  are
treated   as  separate   corporations.  Furthermore,  the   Code  provides  that
regulations may disallow the ability of  a thrift institution to use  deductions
to offset excess inclusions if necessary or appropriate to prevent the avoidance
of  tax. A thrift institution may not so offset its excess inclusions unless the
Residual Certificates  have "significant  value," which  requires that  (i)  the
Residual  Certificates have an issue  price that is at least  equal to 2% of the
aggregate  of  the  issue  prices  of  all  Residual  Certificates  and  Regular
Certificates  with respect to the REMIC  Pool, and (ii) the anticipated weighted
average life of  the Residual Certificates  is at least  20% of the  anticipated
weighted  average life of the REMIC  Pool. The anticipated weighted average life
of the Residual  Certificates is based  on all distributions  anticipated to  be
received with respect thereto (using the Prepayment Assumption). The anticipated
weighted  average life of the REMIC Pool  is the aggregate weighted average life
of  all  classes   of  interests   therein  (computed   using  all   anticipated
distributions  on a regular interest with  nominal or no principal). Finally, an
ordering rule under the REMIC Regulations provides that a thrift institution may
only offset  its excess  inclusion income  with deductions  after it  has  first
applied  its deductions against  income that is not  excess inclusion income. If
applicable, the Prospectus Supplement  with respect to a  Series will set  forth
whether  the  Residual Certificates  are  expected to  have  "significant value"
within the meaning of the REMIC Regulations.
 
                                       79
<PAGE>
    TAX-RELATED RESTRICTIONS ON TRANSFER OF RESIDUAL CERTIFICATES
 
    DISQUALIFIED ORGANIZATIONS.    If any  legal  or beneficial  interest  in  a
Residual  Certificate is transferred to  a Disqualified Organization (as defined
below), a tax  would be imposed  in an amount  equal to the  product of (i)  the
present  value of the  total anticipated excess inclusions  with respect to such
Residual Certificate  for  periods  after  the transfer  and  (ii)  the  highest
marginal   federal  income  tax  rate  applicable  to  corporations.  The  REMIC
Regulations provide that the anticipated  excess inclusions are based on  actual
prepayment  experience to the date of  the transfer and projected payments based
on the  Prepayment Assumption.  The  present value  rate equals  the  applicable
Federal  rate under Code  Section 1274(d) as of  the date of  the transfer for a
term ending  with the  last  calendar quarter  in  which excess  inclusions  are
expected  to accrue. Such  rate is applied to  the anticipated excess inclusions
from the end of the remaining calendar quarters in which they arise to the  date
of  the transfer. Such a tax generally would be imposed on the transferor of the
Residual Certificate,  except  that where  such  transfer is  through  an  agent
(including   a  broker,  nominee,   or  other  middleman)   for  a  Disqualified
Organization, the  tax  would instead  be  imposed  on such  agent.  However,  a
transferor  of a Residual Certificate  would in no event  be liable for such tax
with respect to  a transfer  if the transferee  furnishes to  the transferor  an
affidavit stating that the transferee is not a Disqualified Organization and, as
of  the time of the transfer, the transferor does not have actual knowledge that
such affidavit is  false. The tax  also may  be waived by  the Internal  Revenue
Service  if  the Disqualified  Organization  promptly disposes  of  the Residual
Certificate and the transferor pays income tax at the highest corporate rate  on
the excess inclusion for the period the Residual Certificate is actually held by
the Disqualified Organization.
 
    In  addition,  if  a "Pass-Through  Entity"  (as defined  below)  has excess
inclusion income with respect  to a Residual Certificate  during a taxable  year
and  a Disqualified Organization is  the record holder of  an equity interest in
such entity, then a tax  is imposed on such entity  equal to the product of  (i)
the  amount  of excess  inclusions that  are  allocable to  the interest  in the
Pass-Through Entity during the period such interest is held by such Disqualified
Organization, and (ii) the highest  marginal federal corporate income tax  rate.
Such  tax would be deductible from the ordinary gross income of the Pass-Through
Entity for the  taxable year. The  Pass-Through Entity would  not be liable  for
such  tax if it has received an affidavit from such record holder that it is not
a Disqualified  Organization or  stating such  holder's taxpayer  identification
number  and, during the period such person  is the record holder of the Residual
Certificate, the Pass-Through Entity  does not have  actual knowledge that  such
affidavit is false.
 
    For these purposes, (i) "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  (provided, that such term does  not include an instrumentality if all
of its activities are subject to tax and a majority of its board of directors is
not selected  by any  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),  and 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, and (ii) "Pass-Through
Entity" means any  regulated investment company,  real estate investment  trust,
common  trust  fund,  partnership,  trust  or  estate  and  certain corporations
operating on  a  cooperative  basis.  Except as  may  be  provided  in  Treasury
regulations,  any  person holding  an  interest in  a  Pass-Through Entity  as a
nominee for  another  will, with  respect  to such  interest,  be treated  as  a
Pass-Through Entity.
 
    The  Pooling and Servicing  Agreement with respect to  a Series will provide
that  no  legal  or  beneficial  interest  in  a  Residual  Certificate  may  be
transferred  or registered unless  (i) the proposed  transferee furnishes to the
Seller and the Trustee an affidavit providing its taxpayer identification number
and stating  that  such transferee  is  the  beneficial owner  of  the  Residual
Certificate  and is not  a Disqualified Organization and  is not purchasing such
Residual Certificate  on  behalf of  a  Disqualified Organization  (I.E.,  as  a
broker,  nominee  or  middleman  thereof) and  (ii)  the  transferor  provides a
 
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statement in  writing to  the  Seller and  the Trustee  that  it has  no  actual
knowledge  that such  affidavit is  false. Moreover,  the Pooling  and Servicing
Agreement will provide that any attempted or purported transfer in violation  of
these transfer restrictions will be null and void and will vest no rights in any
purported  transferee. Each Residual  Certificate with respect  to a Series will
bear a legend  referring to  such restrictions  on transfer,  and each  Residual
Holder  will be deemed to  have agreed, as a  condition of ownership thereof, to
any amendments to the related Pooling and Servicing Agreement required under the
Code  or   applicable  Treasury   regulations   to  effectuate   the   foregoing
restrictions.  Information necessary to compute an applicable excise tax must be
furnished to the Internal Revenue Service and to the requesting party within  60
days  of  the request,  and  the Seller  or  the Trustee  may  charge a  fee for
computing and providing such information.
 
    NONECONOMIC RESIDUAL  INTERESTS.    The REMIC  Regulations  would  disregard
certain  transfers of Residual Certificates, in  which case the transferor would
continue to be treated as the owner of the Residual Certificates and thus  would
continue  to be subject to tax on its allocable portion of the net income of the
REMIC Pool. Under the REMIC Regulations,  a transfer of a "noneconomic  residual
interest"  (as defined below) to a Residual Holder (other than a Residual Holder
who is  not  a U.S.  Person,  as defined  below  under "Foreign  Investors")  is
disregarded  for all federal income tax purposes if a significant purpose of the
transferor is to impede the assessment or collection of tax. A residual interest
in a REMIC (including a residual interest with a positive value at issuance)  is
a  "noneconomic residual interest" unless, at the  time of the transfer, (i) the
present value of the expected future  distributions on the residual interest  at
least  equals  the  product  of  the present  value  of  the  anticipated excess
inclusions and the highest corporate income tax  rate in effect for the year  in
which  the transfer occurs, and (ii)  the transferor reasonably expects that the
transferee will receive  distributions from the  REMIC at or  after the time  at
which  taxes accrue on the anticipated excess inclusions in an amount sufficient
to satisfy the accrued  taxes on each excess  inclusion. The anticipated  excess
inclusions  and the present value rate are  determined in the same manner as set
forth above under  "Disqualified Organizations." The  REMIC Regulations  explain
that  a significant purpose to impede the assessment or collection of tax exists
if the transferor, at the time of the transfer, either knew or should have known
that the transferee would be unwilling or  unable to pay taxes due on its  share
of  the  taxable income  of the  REMIC. A  safe  harbor is  provided if  (i) the
transferor conducted, at the time of the transfer, a reasonable investigation of
the financial  condition  of  the  transferee  and  found  that  the  transferee
historically  had  paid its  debts as  they  came due  and found  no significant
evidence to indicate that the transferee would not continue to pay its debts  as
they  came  due  in  the  future, and  (ii)  the  transferee  represents  to the
transferor that it understands that, as the holder of the non-economic  residual
interest,  the transferee may incur tax liabilities  in excess of any cash flows
generated by  the  interest  and  that  the  transferee  intends  to  pay  taxes
associated  with holding the  residual interest as they  become due. The Pooling
and Servicing Agreement with respect to each Series of Certificates will require
the transferee  of a  Residual Certificate  to  certify to  the matters  in  the
preceding  sentence as part  of the affidavit described  above under the heading
"Disqualified Organizations."
 
    FOREIGN INVESTORS.   The REMIC Regulations  provide that the  transfer of  a
Residual  Certificate that has  "tax avoidance potential"  to a "foreign person"
will be disregarded for all federal tax purposes. This rule appears intended  to
apply to a transferee who is not a "U.S. Person" (as defined below), unless such
transferee's  income is  effectively connected  with the  conduct of  a trade or
business within the United States. A Residual Certificate is deemed to have  tax
avoidance potential unless, at the time of the transfer, (i) the future value of
expected  distributions equals at least 30% of the anticipated excess inclusions
after the  transfer,  and  (ii)  the  transferor  reasonably  expects  that  the
transferee will receive sufficient distributions from the REMIC Pool at or after
the  time at which the excess inclusions accrue and prior to the end of the next
succeeding taxable  year for  the accumulated  withholding tax  liability to  be
paid.  If the non-U.S. Person transfers the  Residual Certificate back to a U.S.
Person, the  transfer  will  be  disregarded and  the  foreign  transferor  will
continue  to be treated  as the owner  unless arrangements are  made so that the
transfer does not have  the effect of  allowing the transferor  to avoid tax  on
accrued excess inclusions.
 
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<PAGE>
    The  Prospectus  Supplement relating  to the  Certificates  of a  Series may
provide that a Residual  Certificate may not be  purchased by or transferred  to
any  person that  is not  a U.S.  Person or  may describe  the circumstances and
restrictions pursuant  to which  such a  transfer may  be made.  The term  "U.S.
Person"  means  a  citizen or  resident  of  the United  States,  a corporation,
partnership or other entity  created or organized  in or under  the laws of  the
United  States or any political subdivision thereof,  or an estate or trust that
is subject to U.S. federal income tax regardless of the source of its income.
 
    SALE OR EXCHANGE OF A RESIDUAL CERTIFICATE
 
    Upon the sale  or exchange of  a Residual Certificate,  the Residual  Holder
will  recognize gain or loss equal to the excess, if any, of the amount realized
over the  adjusted  basis  (as  described  above  under  "Taxation  of  Residual
Certificates  -- Basis  and Losses")  of such  Residual Holder  in such Residual
Certificate at the time of  the sale or exchange.  In addition to reporting  the
taxable  income of the REMIC Pool, a Residual Holder will have taxable income to
the extent that any  cash distribution to  it from the  REMIC Pool exceeds  such
adjusted  basis on that Distribution  Date. Such income will  be treated as gain
from the sale or exchange of the  Residual Certificate. It is possible that  the
termination of the REMIC Pool may be treated as a sale or exchange of a Residual
Holder's  Residual Certificate,  in which  case, if  the Residual  Holder has an
adjusted basis in its  Residual Certificate remaining when  its interest in  the
REMIC  Pool terminates, and if  it holds such Residual  Certificate as a capital
asset under Code Section  1221, then it  will recognize a  capital loss at  that
time in the amount of such remaining adjusted basis.
 
    Any  gain on the sale of a  Residual Certificate will be treated as ordinary
income (i)  if  a  Residual  Certificate  is  held  as  part  of  a  "conversion
transaction"  as defined in Code  Section 1258(c), up to  the amount of interest
that would have accrued  on the Residual  Certificateholder's net investment  in
the conversion transaction at 120% of the appropriate applicable Federal rate in
effect  at the time the  taxpayer entered into the  transaction minus any amount
previously treated as ordinary income with  respect to any prior disposition  of
property  that was held as a  part of such transaction or  (ii) in the case of a
non-corporate taxpayer, to the extent such  taxpayer has made an election  under
Code  Section 163(d)(4) to have net capital  gains taxed as investment income at
ordinary income rates. In addition, gain or  loss recognized from the sale of  a
Residual  Certificate by certain banks or thrift institutions will be treated as
ordinary income or loss pursuant to Code Section 582(c).
 
    The Conference Committee  Report to the  1986 Act provides  that, except  as
provided  in Treasury regulations yet to be  issued, the wash sale rules of Code
Section 1091  will apply  to  dispositions of  Residual Certificates  where  the
seller  of  the Residual  Certificate, during  the  period beginning  six months
before the sale or disposition of the Residual Certificate and ending six months
after such sale or disposition, acquires  (or enters into any other  transaction
that  results in the application of Code  Section 1091) any residual interest in
any REMIC or  any interest in  a "taxable  mortgage pool" (such  as a  non-REMIC
owner trust) that is economically comparable to a Residual Certificate.
 
    MARK TO MARKET REGULATIONS
 
    Prospective  purchasers of the Residual Certificates should be aware that on
January 3, 1995, the Internal Revenue Service released proposed regulations (the
"Proposed Mark to Market  Regulations") under Code Section  475 relating to  the
requirement  that a securities dealer mark to market securities held for sale to
customers. This  mark-to-market  requirement  applies to  all  securities  of  a
dealer,  except  to the  extent that  the dealer  has specifically  identified a
security as held for investment. The Proposed Mark to Market Regulations provide
that, for purposes of this mark-to-market requirement, a Residual Certificate is
not treated as a  security and thus  may not be marked  to market. The  Proposed
Mark  to Market  Regulations apply to  all Residual Certificates  acquired on or
after January 4, 1995.
 
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TAXES THAT MAY BE IMPOSED ON THE REMIC POOL
 
    PROHIBITED TRANSACTIONS
 
    Income from  certain  transactions  by the  REMIC  Pool,  called  prohibited
transactions,  will not be part of the  calculation of income or loss includible
in the federal income tax returns of Residual Holders, but rather will be  taxed
directly  to the  REMIC Pool at  a 100% rate.  Prohibited transactions generally
include (i)  the  disposition  of  a  qualified  mortgage  other  than  for  (a)
substitution  within two years of  the Startup Day for  a defective (including a
defaulted) obligation  (or repurchase  in lieu  of substitution  of a  defective
(including  a defaulted) obligation  at any time) or  for any qualified mortgage
within three months of  the Startup Day, (b)  foreclosure, default, or  imminent
default of a qualified mortgage, (c) bankruptcy or insolvency of the REMIC Pool,
or  (d)  a qualified  (complete) liquidation,  (ii) the  receipt of  income from
assets that are not the type of mortgages or investments that the REMIC Pool  is
permitted  to hold, (iii) the receipt of  compensation for services, or (iv) the
receipt of gain from disposition of cash flow investments other than pursuant to
a qualified liquidation. Notwithstanding  (i) and (iv), it  is not a  prohibited
transaction  to  sell  REMIC  Pool  property to  prevent  a  default  on Regular
Certificates as a result of a default on qualified mortgages or to facilitate  a
clean-up  call (generally, an optional  termination to save administrative costs
when no more than  a small percentage of  the Certificates is outstanding).  The
REMIC  Regulations indicate that  the modification of  a Mortgage Loan generally
will not  be treated  as a  disposition  if it  is occasioned  by a  default  or
reasonably  foreseeable default, an assumption of  the Mortgage Loan, the waiver
of a due-on-sale or due-on-encumbrance clause, or the conversion of an  interest
rate  by a  mortgagor pursuant  to the  terms of  a convertible  adjustable rate
Mortgage Loan.
 
    CONTRIBUTIONS TO THE REMIC POOL AFTER THE STARTUP DAY
 
    In general, the REMIC Pool will  be subject to a tax  at a 100% rate on  the
value  of any  property contributed  to the  REMIC Pool  after the  Startup Day.
Exceptions are provided for cash contributions to the REMIC Pool (i) during  the
three months following the Startup Day, (ii) made to a qualified reserve fund by
a Residual Holder, (iii) in the nature of a guarantee, (iv) made to facilitate a
qualified  liquidation  or  clean-up call,  and  (v) as  otherwise  permitted in
Treasury regulations yet to be issued. It is not anticipated that there will  be
any contributions to the REMIC Pool after the Startup Day.
 
    NET INCOME FROM FORECLOSURE PROPERTY
 
    The  REMIC  Pool  will be  subject  to  federal income  tax  at  the highest
corporate  rate  on  "net  income  from  foreclosure  property,"  determined  by
reference  to the rules applicable to  real estate investment trusts. Generally,
property  acquired  by  deed  in  lieu  of  foreclosure  would  be  treated   as
"foreclosure  property" for a period of two years, with possible extensions. Net
income from  foreclosure  property generally  means  gain  from the  sale  of  a
foreclosure   property  that  is  inventory   property  and  gross  income  from
foreclosure property other than qualifying rents and other qualifying income for
a real estate investment trust. It is  not anticipated that the REMIC Pool  will
have any taxable net income from foreclosure property.
 
LIQUIDATION OF THE REMIC POOL
 
    If a REMIC Pool adopts a plan of complete liquidation, within the meaning of
Code  Section 860F(a)(4)(A)(i), which may be  accomplished by designating in the
REMIC Pool's final tax return a date on which such adoption is deemed to  occur,
and  sells all of its assets (other  than cash) within a 90-day period beginning
on such date, the REMIC Pool will  not be subject to the prohibited  transaction
rules  on  the sale  of  its assets,  provided that  the  REMIC Pool  credits or
distributes in liquidation all  of the sale proceeds  plus its cash (other  than
amounts retained to meet claims) to holders of Regular Certificates and Residual
Holders within the 90-day period.
 
ADMINISTRATIVE MATTERS
 
    The  REMIC Pool will  be required to  maintain its books  on a calendar year
basis and to file federal income tax returns for federal income tax purposes  in
a  manner similar to a partnership. The form  for such income tax return is Form
1066,   U.S.   Real    Estate   Mortgage   Investment    Conduit   Income    Tax
 
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Return.  The Trustee will be required to sign the REMIC Pool's returns. Treasury
regulations provide that, except where there is a single Residual Holder for  an
entire  taxable  year, the  REMIC Pool  will  be subject  to the  procedural and
administrative rules  of  the Code  applicable  to partnerships,  including  the
determination by the Internal Revenue Service of any adjustments to, among other
things,  items of REMIC  income, gain, loss,  deduction, or credit  in a unified
administrative proceeding. The Master Servicer will be obligated to act as  "tax
matters  person," as defined in applicable Treasury regulations, with respect to
the REMIC  Pool, in  its capacity  as either  Residual Holder  or agent  of  the
Residual  Holders. If the Code or  applicable Treasury regulations do not permit
the Master Servicer to act as tax matters person in its capacity as agent of the
Residual Holders, the  Residual Holder chosen  by the Residual  Holders or  such
other  person specified pursuant to Treasury regulations will be required to act
as tax matters person.
 
LIMITATIONS ON DEDUCTION OF CERTAIN EXPENSES
 
    An investor  who is  an individual,  estate,  or trust  will be  subject  to
limitation with respect to certain itemized deductions described in Code Section
67, to the extent that such itemized deductions, in the aggregate, do not exceed
2%  of  the  investor's adjusted  gross  income.  In addition,  Code  Section 68
provides that itemized deductions otherwise allowable  for a taxable year of  an
individual  taxpayer will be reduced  by the lesser of (i)  3% of the excess, if
any, of adjusted gross income  over $100,000 ($50,000 in  the case of a  married
individual  filing a separate return) (subject  to adjustment for inflation), or
(ii) 80% of the amount of itemized deductions otherwise allowable for such year.
In the case of a REMIC Pool,  such deductions may include deductions under  Code
Section  212 for  the Servicing  Fee and  all administrative  and other expenses
relating to the REMIC Pool, or any similar expenses allocated to the REMIC  Pool
with respect to a regular interest it holds in another REMIC. Such investors who
hold  REMIC  Certificates either  directly or  indirectly through  certain pass-
through entities may  have their pro  rata share of  such expenses allocated  to
them  as  additional gross  income, but  may  be subject  to such  limitation on
deductions. In addition, such expenses are not deductible at all for purposes of
computing the  alternative minimum  tax,  and may  cause  such investors  to  be
subject  to significant additional tax liability. Temporary Treasury regulations
provide that the additional  gross income and  corresponding amount of  expenses
generally  are to be allocated entirely  to the holders of Residual Certificates
in the case of a REMIC Pool that  would not qualify as a fixed investment  trust
in  the absence of a  REMIC election. However, such  additional gross income and
limitation on deductions will apply to the allocable portion of such expenses to
holders of Regular Certificates,  as well as  holders of Residual  Certificates,
where  such  Regular Certificates  are issued  in  a manner  that is  similar to
pass-through  certificates  in  a  fixed  investment  trust.  Unless   indicated
otherwise  in the  applicable Prospectus Supplement,  all such  expenses will be
allocable to the Residual Certificates. In general, such allocable portion  will
be  determined  based  on the  ratio  that a  REMIC  Certificateholder's income,
determined on a  daily basis,  bears to  the income  of all  holders of  Regular
Certificates  and  Residual Certificates  with  respect to  a  REMIC Pool.  As a
result, individuals,  estates  or  trusts  holding  REMIC  Certificates  (either
directly  or  indirectly through  a grantor  trust, partnership,  S corporation,
REMIC, or  certain  other  pass-through  entities  described  in  the  foregoing
temporary  Treasury  regulations)  may  have taxable  income  in  excess  of the
interest income at the pass-through rate on Regular Certificates that are issued
in a single class or otherwise  consistently with fixed investment trust  status
or  in  excess  of  cash  distributions  for  the  related  period  on  Residual
Certificates.
 
TAXATION OF CERTAIN FOREIGN INVESTORS
 
    REGULAR CERTIFICATES
 
    Interest,  including  original  issue  discount,  distributable  to  Regular
Certificateholders  who are non-resident aliens,  foreign corporations, or other
Non-U.S. Persons (as  defined below),  will be  considered "portfolio  interest"
and,  therefore, generally will not be  subject to 30% United States withholding
tax, provided that such  Non-U.S. Person (i) is  not a "10-percent  shareholder"
within  the  meaning  of  Code  Section  871(h)(3)(B)  or  a  controlled foreign
corporation described  in  Code  Section  881(c)(3)(C)  and  (ii)  provides  the
Trustee,    or    the   person    who   would    otherwise   be    required   to
 
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withhold tax from such  distributions under Code Section  1441 or 1442, with  an
appropriate  statement,  signed  under  penalties  of  perjury,  identifying the
beneficial owner and stating, among other  things, that the beneficial owner  of
the  Regular Certificate is a  Non-U.S. Person. If such  statement, or any other
required statement, is not provided,  30% withholding will apply unless  reduced
or eliminated pursuant to an applicable tax treaty or unless the interest on the
Regular  Certificate is  effectively connected  with the  conduct of  a trade or
business within the United States by  such Non-U.S. Person. In the latter  case,
such  Non-U.S. Person  will be  subject to United  States federal  income tax at
regular rates. Investors who are Non-U.S.  Persons should consult their own  tax
advisors  regarding the  specific tax consequences  to them of  owning a Regular
Certificate. The  term "Non-U.S.  Person" means  any person  who is  not a  U.S.
Person.
 
    RESIDUAL CERTIFICATES
 
    The  Conference Committee Report to the 1986 Act indicates that amounts paid
to Residual Holders  who are  Non-U.S. Persons  generally should  be treated  as
interest  for  purposes  of  the  30%  (or  lower  treaty  rate)  United  States
withholding tax.  Treasury  regulations  provide  that  amounts  distributed  to
Residual  Holders may qualify as "portfolio interest," subject to the conditions
described in "Regular Certificates" above, but  only to the extent that (i)  the
Mortgage  Loans were  issued after July  18, 1984  and (ii) the  Trust Estate or
segregated pool of assets therein (as to which a separate REMIC election will be
made), to which the Residual Certificate relates, consists of obligations issued
in "registered form" within  the meaning of  Code Section 163(f)(1).  Generally,
Mortgage Loans will not be, but regular interests in another REMIC Pool will be,
considered obligations issued in registered form. Furthermore, a Residual Holder
will  not be entitled  to any exemption  from the 30%  withholding tax (or lower
treaty rate)  to  the  extent of  that  portion  of REMIC  taxable  income  that
constitutes  an "excess  inclusion." See  "Taxation of  Residual Certificates --
Limitations on Offset  or Exemption  of REMIC Income."  If the  amounts paid  to
Residual  Holders who  are Non-U.S. Persons  are effectively  connected with the
conduct of  a  trade or  business  within the  United  States by  such  Non-U.S.
Persons,  30% (or  lower treaty rate)  withholding will not  apply. Instead, the
amounts paid to such Non-U.S. Persons  will be subject to United States  federal
income  tax  at regular  rates. If  30%  (or lower  treaty rate)  withholding is
applicable, such amounts generally  will be taken into  account for purposes  of
withholding  only  when  paid or  otherwise  distributed (or  when  the Residual
Certificate is disposed of) under rules similar to withholding upon  disposition
of  debt  instruments  that  have  original  issue  discount.  See  "Tax-Related
Restrictions on Transfer  of Residual Certificates  -- Foreign Investors"  above
concerning  the disregard of certain transfers having "tax avoidance potential."
Investors who  are  Non-U.S.  Persons  should consult  their  own  tax  advisors
regarding the specific tax consequences to them of owning Residual Certificates.
 
BACKUP WITHHOLDING
 
    Distributions  made on the Regular Certificates,  and proceeds from the sale
of the Regular Certificates to or through  certain brokers, may be subject to  a
"backup" withholding tax under Code Section 3406 of 31% on "reportable payments"
(including  interest distributions, original issue  discount, and, under certain
circumstances, principal  distributions)  unless the  Regular  Certificateholder
complies  with certain reporting and/or  certification procedures, including the
provision of its taxpayer identification number to the Trustee, its agent or the
broker  who   effected  the   sale   of  the   Regular  Certificate,   or   such
Certificateholder  is otherwise an exempt  recipient under applicable provisions
of the  Code.  Any amounts  to  be withheld  from  distribution on  the  Regular
Certificates  would be refunded by the Internal  Revenue Service or allowed as a
credit against the Regular Certificateholder's federal income tax liability.
 
REPORTING REQUIREMENTS
 
    Reports  of  accrued  interest,  original  issue  discount  and  information
necessary to compute the accrual of market discount will be made annually to the
Internal   Revenue  Service   and  to   individuals,  estates,   non-exempt  and
non-charitable trusts,  and partnerships  who are  either holders  of record  of
Regular Certificates or beneficial owners who own Regular Certificates through a
broker  or middleman as nominee. All  brokers, nominees and all other non-exempt
holders of record of Regular
 
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Certificates (including corporations, non-calendar year taxpayers, securities or
commodities dealers, real estate investment trusts, investment companies, common
trust funds,  thrift  institutions  and  charitable  trusts)  may  request  such
information  for any calendar  quarter by telephone or  in writing by contacting
the person designated in Internal  Revenue Service Publication 938 with  respect
to  a particular Series  of Regular Certificates.  Holders through nominees must
request such information from the nominee.
 
    The Internal Revenue  Service's Form  1066 has an  accompanying Schedule  Q,
Quarterly  Notice to  Residual Interest Holders  of REMIC Taxable  Income or Net
Loss Allocation. Treasury regulations  require that Schedule  Q be furnished  by
the  REMIC Pool to  each Residual Holder by  the end of  the month following the
close of  each calendar  quarter  (41 days  after the  end  of a  quarter  under
proposed Treasury regulations) in which the REMIC Pool is in existence.
 
    Treasury   regulations   require  that,   in   addition  to   the  foregoing
requirements, information  must  be  furnished quarterly  to  Residual  Holders,
furnished annually, if applicable, to holders of Regular Certificates, and filed
annually  with the Internal Revenue Service  concerning Code Section 67 expenses
(see "Limitations on  Deduction of  Certain Expenses" above)  allocable to  such
holders.  Furthermore,  under such  regulations,  information must  be furnished
quarterly  to  Residual  Holders,  furnished  annually  to  holders  of  Regular
Certificates,  and filed annually  with the Internal  Revenue Service concerning
the percentage of  the REMIC  Pool's assets  meeting the  qualified asset  tests
described above under "Status of REMIC Certificates."
 
FEDERAL INCOME TAX CONSEQUENCES FOR CERTIFICATES AS TO WHICH NO REMIC ELECTION
IS MADE
 
    GENERAL
 
    In  the  event that  no  election is  made  to treat  a  Trust Estate  (or a
segregated pool of assets therein) with respect to a Series of Certificates as a
REMIC, the Trust Estate will be classified  as a grantor trust under subpart  E,
Part  1 of  subchapter J  of the  Code and  not as  an association  taxable as a
corporation or a  "taxable mortgage  pool" within  the meaning  of Code  Section
7701(i).  Where there is  no Fixed Retained  Yield with respect  to the Mortgage
Loans underlying the Certificates of a  Series, and where such Certificates  are
not  designated as "Stripped Certificates," the  holder of each such Certificate
in such Series will be treated as the owner of a pro rata undivided interest  in
the  ordinary income and corpus portions of  the Trust Estate represented by its
Certificate and will be considered the beneficial owner of a pro rata  undivided
interest  in each of the  Mortgage Loans, subject to  the discussion below under
"Recharacterization of Servicing Fees." Accordingly, the holder of a Certificate
of a particular  Series will be  required to  report on its  federal income  tax
return  its  pro  rata  share  of the  entire  income  from  the  Mortgage Loans
represented by its Certificate,  including interest at the  coupon rate on  such
Mortgage  Loans, original issue  discount (if any),  prepayment fees, assumption
fees, and late payment charges received by the Servicer, in accordance with such
Certificateholder's method of accounting. A Certificateholder generally will  be
able  to deduct its share of the  Servicing Fee and all administrative and other
expenses of  the Trust  Estate  in accordance  with  its method  of  accounting,
provided  that such amounts are reasonable compensation for services rendered to
that Trust Estate. However, investors who are individuals, estates or trusts who
own Certificates,  either directly  or indirectly  through certain  pass-through
entities,  will  be  subject  to limitation  with  respect  to  certain itemized
deductions described in Code Section 67, including deductions under Code Section
212 for the Servicing Fee and all such administrative and other expenses of  the
Trust  Estate, to  the extent  that such  deductions, in  the aggregate,  do not
exceed two percent  of an investor's  adjusted gross income.  In addition,  Code
Section  68 provides that itemized deductions  otherwise allowable for a taxable
year of an individual taxpayer  will be reduced by the  lesser of (i) 3% of  the
excess, if any, of adjusted gross income over $100,000 ($50,000 in the case of a
married  individual filing  a separate  return) (in  each case,  as adjusted for
inflation), or (ii) 80% of the amount of itemized deductions otherwise allowable
for such year.  As a result,  such investors holding  Certificates, directly  or
indirectly  through a pass-through entity, may  have aggregate taxable income in
excess of  the aggregate  amount  of cash  received  on such  Certificates  with
respect  to interest  at the  pass-through rate  or as  discount income  on such
Certificates. In addition, such expenses are not deductible at all for  purposes
of
 
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computing  the  alternative minimum  tax,  and may  cause  such investors  to be
subject to significant additional tax liability. Moreover, where there is  Fixed
Retained  Yield  with  respect to  the  Mortgage  Loans underlying  a  Series of
Certificates or where the servicing fees  are in excess of reasonable  servicing
compensation,  the  transaction  will  be  subject  to  the  application  of the
"stripped bond" and  "stripped coupon"  rules of  the Code,  as described  below
under  "Stripped  Certificates"  and  "Recharacterization  of  Servicing  Fees,"
respectively.
 
    TAX STATUS
 
    Cadwalader, Wickersham  &  Taft  has  advised the  Seller  that,  except  as
described below with respect to Stripped Certificates:
 
       1.  A  Certificate owned  by a  "domestic building  and loan association"
           within the meaning of Code Section 7701(a)(19) will be considered  to
    represent  "loans...secured  by an  interest  in real  property"  within the
    meaning of Code Section 7701(a)(19)(C)(v),  provided that the real  property
    securing  the Mortgage Loans represented by  that Certificate is of the type
    described in such section of the Code.
 
       2.  A Certificate  owned by  a financial  institution described  in  Code
           Section  593(a)  will  be considered  to  represent  "qualifying real
    property loans" within the meaning of Code Section 593(d)(1), provided  that
    the   real  property  securing  the   Mortgage  Loans  represented  by  that
    Certificate is of the type described in such section of the Code.
 
       3.  A Certificate  owned  by  a  real estate  investment  trust  will  be
           considered  to represent "real  estate assets" within  the meaning of
    Code Section 856(c)(5)(A) to the extent that the assets of the related Trust
    Estate consist of qualified assets, and interest income on such assets  will
    be  considered  "interest  on  obligations  secured  by  mortgages  on  real
    property" to such extent within the meaning of Code Section 856(c)(3)(B).
 
       4.  A Certificate owned  by a REMIC  will be considered  to represent  an
           "obligation (including any participation or certificate of beneficial
    ownership  therein)  which is  principally secured  by  an interest  in real
    property" within the  meaning of  Code Section 860G(a)(3)(A)  to the  extent
    that the assets of the related Trust Estate consist of "qualified mortgages"
    within the meaning of Code Section 860G(a)(3).
 
    An  issue arises as to whether Buy-Down  Loans may be characterized in their
entirety under  the  Code  provisions  cited  in clauses  1,  2  and  3  of  the
immediately  preceding paragraph.  Code Section  593(d)(1)(C) provides  that the
term "qualifying real  property loan"  does not include  a loan  "to the  extent
secured  by a  deposit in  or share  of the  taxpayer." The  application of this
provision to a  Buy-Down Fund is  uncertain, but may  require that a  taxpayer's
investment  in  a Buy-Down  Loan  be reduced  by the  Buy-Down  Fund. As  to the
treatment of  Buy-Down Loans  as  "qualifying real  property loans"  under  Code
Section 593(d)(1) if the exception of Code Section 593(d)(1)(C) is inapplicable,
as  "loans...secured  by  an  interest  in  real  property"  under  Code Section
7701(a)(19)(C)(v) or as  "real estate assets"  under Code Section  856(c)(5)(A),
there  is indirect authority supporting treatment of an investment in a Buy-Down
Loan as entirely secured by real property  if the fair market value of the  real
property  securing the loan exceeds the principal amount of the loan at the time
of issuance or acquisition, as the case  may be. There is no assurance that  the
treatment  described above is proper.  Accordingly, Certificateholders are urged
to consult their own tax advisors concerning the effects of such arrangements on
the characterization of such  Certificateholder's investment for federal  income
tax purposes.
 
    PREMIUM AND DISCOUNT
 
    Certificateholders  are advised to consult with their tax advisors as to the
federal income tax treatment of premium and discount arising either upon initial
acquisition of Certificates or thereafter.
 
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<PAGE>
    PREMIUM.   The  treatment  of  premium  incurred  upon  the  purchase  of  a
Certificate  will  be determined  generally  as described  above  under "Federal
Income  Tax  Consequences  for  REMIC  Certificates  --  Taxation  of   Residual
Certificates -- Premium."
 
    ORIGINAL ISSUE DISCOUNT.  The original issue discount rules of Code Sections
1271  through 1275 will be applicable to a Certificateholder's interest in those
Mortgage Loans as to which the conditions for the application of those  sections
are  met. Rules regarding  periodic inclusion of  original issue discount income
are applicable  to mortgages  of  corporations originated  after May  27,  1969,
mortgages  of noncorporate mortgagors (other  than individuals) originated after
July 1, 1982, and mortgages of individuals originated after March 2, 1984. Under
the OID Regulations, such original issue discount could arise by the charging of
points by  the  originator  of the  mortgages  in  an amount  greater  than  the
statutory  DE MINIMIS exception, including a payment of points that is currently
deductible by the borrower  under applicable Code  provisions or, under  certain
circumstances,  by the presence of "teaser" rates on the Mortgage Loans. See "--
Stripped Certificates"  below  regarding  original issue  discount  on  Stripped
Certificates.
 
    Original  issue discount generally must be reported as ordinary gross income
as it  accrues under  a constant  interest method  that takes  into account  the
compounding  of interest,  in advance of  the cash attributable  to such income.
Unless  indicated  otherwise  in   the  applicable  Prospectus  Supplement,   no
prepayment  assumption will  be assumed for  purposes of  such accrual. However,
Code Section  1272 provides  for a  reduction in  the amount  of original  issue
discount includible in the income of a holder of an obligation that acquires the
obligation  after its initial  issuance at a  price greater than  the sum of the
original issue price and  the previously accrued  original issue discount,  less
prior  payments of principal. Accordingly, if  such Mortgage Loans acquired by a
Certificateholder are purchased at  a price equal to  the then unpaid  principal
amount  of such Mortgage  Loans, no original issue  discount attributable to the
difference between the  issue price and  the original principal  amount of  such
Mortgage Loans (I.E., points) will be includible by such holder.
 
    MARKET  DISCOUNT.   Certificateholders also  will be  subject to  the market
discount rules  to the  extent  that the  conditions  for application  of  those
sections  are met. Market discount on the  Mortgage Loans will be determined and
will be reported  as ordinary  income generally  in the  manner described  above
under  "Federal Income  Tax Consequences for  REMIC Certificates  -- Taxation of
Regular Certificates  --  Market  Discount," except  that  the  ratable  accrual
methods  described therein will not apply. Rather, the holder will accrue market
discount pro rata over the life of the Mortgage Loans, unless the constant yield
method is  elected.  Unless indicated  otherwise  in the  applicable  Prospectus
Supplement,  no  prepayment  assumption will  be  assumed for  purposes  of such
accrual.
 
    RECHARACTERIZATION OF SERVICING FEES
 
    If the servicing fees  paid to a Servicer  were deemed to exceed  reasonable
servicing compensation, the amount of such excess would represent neither income
nor   a  deduction  to   Certificateholders.  In  this   regard,  there  are  no
authoritative guidelines  for  federal income  tax  purposes as  to  either  the
maximum  amount of servicing  compensation that may  be considered reasonable in
the context of  this or  similar transactions  or whether,  in the  case of  the
Certificate,  the reasonableness of servicing  compensation should be determined
on a  weighted  average  or  loan-by-loan basis.  If  a  loan-by-loan  basis  is
appropriate,  the likelihood that such  amount would exceed reasonable servicing
compensation as  to some  of the  Mortgage Loans  would be  increased.  Recently
issued  Internal  Revenue Service  guidance indicates  that  a servicing  fee in
excess of reasonable compensation ("excess  servicing") will cause the  Mortgage
Loans to be treated under the "stripped bond" rules. Such guidance provides safe
harbors  for  servicing  deemed  to  be  reasonable  and  requires  taxpayers to
demonstrate that the value of  servicing fees in excess  of such amounts is  not
greater than the value of the services provided.
 
    Accordingly,  if  the  Internal  Revenue  Service's  approach  is  upheld, a
Servicer who receives a servicing fee in excess of such amounts would be  viewed
as  retaining an ownership interest in a portion of the interest payments on the
Mortgage Loans.  Under  the  rules  of Code  Section  1286,  the  separation  of
ownership  of the right  to receive some or  all of the  interest payments on an
obligation
 
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from the  right  to  receive some  or  all  of the  principal  payments  on  the
obligation  would  result  in  treatment of  such  Mortgage  Loans  as "stripped
coupons" and "stripped bonds."  Subject to the DE  MINIMIS rule discussed  below
under "-- Stripped Certificates," each stripped bond or stripped coupon could be
considered  for this purpose as a  non-interest bearing obligation issued on the
date of issue of the Certificates, and the original issue discount rules of  the
Code  would apply to the holder thereof. While Certificateholders would still be
treated as owners of beneficial interests in a grantor trust for federal  income
tax  purposes, the corpus of such trust could be viewed as excluding the portion
of the Mortgage Loans the ownership of  which is attributed to the Servicer,  or
as  including such portion  as a second class  of equitable interest. Applicable
Treasury regulations  treat such  an arrangement  as a  fixed investment  trust,
since  the  multiple classes  of  trust interests  should  be treated  as merely
facilitating direct  investments  in  the  trust assets  and  the  existence  of
multiple  classes  of  ownership interests  is  incidental to  that  purpose. In
general, such a recharacterization should  not have any significant effect  upon
the  timing or amount of income reported by a Certificateholder, except that the
income reported  by  a cash  method  holder  may be  slightly  accelerated.  See
"Stripped  Certificates" below for  a further description  of the federal income
tax treatment of stripped bonds and stripped coupons.
 
    SALE OR EXCHANGE OF CERTIFICATES
 
    Upon sale or exchange of  a Certificate, a Certificateholder will  recognize
gain or loss equal to the difference between the amount realized on the sale and
its  aggregate adjusted basis in the Mortgage Loans and other assets represented
by the Certificate.  In general,  the aggregate  adjusted basis  will equal  the
Certificateholder's  cost for  the Certificate, increased  by the  amount of any
income previously reported with respect to the Certificate and decreased by  the
amount of any losses previously reported with respect to the Certificate and the
amount  of any  distributions received  thereon. Except  as provided  above with
respect to  market  discount on  any  Mortgage  Loans, and  except  for  certain
financial  institutions subject  to the provisions  of Code  Section 582(c), any
such gain or loss generally would be capital gain or loss if the Certificate was
held as a  capital asset. However,  gain on the  sale of a  Certificate will  be
treated as ordinary income (i) if a Certificate is held as part of a "conversion
transaction"  as defined in Code  Section 1258(c), up to  the amount of interest
that would  have  accrued  on  the Certificateholder's  net  investment  in  the
conversion  transaction at  120% of the  appropriate applicable  Federal rate in
effect at the time  the taxpayer entered into  the transaction minus any  amount
previously  treated as ordinary income with  respect to any prior disposition of
property that was held as a  part of such transaction or  (ii) in the case of  a
non-corporate  taxpayer, to the extent such  taxpayer has made an election under
Code Section 163(d)(4) to have net  capital gains taxed as investment income  at
ordinary  income  rates.  Pursuant to  the  Revenue Reconciliation  Act  of 1993
capital gains of certain noncorporate taxpayers  are subject to a lower  maximum
tax  rate  than ordinary  income of  such  taxpayers. The  maximum tax  rate for
corporations is the same with respect to both ordinary income and capital gains.
 
STRIPPED CERTIFICATES
 
    GENERAL
 
    Pursuant to Code Section 1286, the  separation of ownership of the right  to
receive some or all of the principal payments on an obligation from ownership of
the  right  to receive  some  or all  of the  interest  payments results  in the
creation of "stripped bonds"  with respect to  principal payments and  "stripped
coupons"  with respect  to interest payments.  For purposes  of this discussion,
Certificates that are subject  to those rules will  be referred to as  "Stripped
Certificates." The Certificates will be subject to those rules if (i) the Seller
or  any  of its  affiliates  retains (for  its own  account  or for  purposes of
resale), in the form of Fixed Retained Yield or otherwise, an ownership interest
in a portion of the  payments on the Mortgage Loans,  (ii) the Seller or any  of
its  affiliates is treated as having an ownership interest in the Mortgage Loans
to   the   extent   it   is    paid   (or   retains)   servicing    compensation
 
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<PAGE>
in  an amount greater  than reasonable consideration  for servicing the Mortgage
Loans (see "Certificates  -- Recharacterization of  Servicing Fees" above),  and
(iii)  a Class of Certificates  are issued in two  or more Classes or Subclasses
representing the right to non-pro-rata percentages of the interest and principal
payments on the Mortgage Loans.
 
    In general, a  holder of a  Stripped Certificate will  be considered to  own
"stripped  bonds" with respect to its pro rata  share of all or a portion of the
principal payments on each Mortgage Loan and/or "stripped coupons" with  respect
to  its pro  rata share of  all or  a portion of  the interest  payments on each
Mortgage Loan,  including  the Stripped  Certificate's  allocable share  of  the
servicing  fees  paid to  a Servicer,  to  the extent  that such  fees represent
reasonable compensation for  services rendered. See  the discussion above  under
"Certificates  -- Recharacterization of Servicing  Fees." Although not free from
doubt, for purposes of reporting  to Stripped Certificateholders, the  servicing
fees  will  be  allocated to  the  Stripped  Certificates in  proportion  to the
respective entitlements to distributions of each Class (or Subclass) of Stripped
Certificates for  the  related period  or  periods.  The holder  of  a  Stripped
Certificate  generally will be entitled  to a deduction each  year in respect of
the servicing fees, as described above under "Certificates -- General,"  subject
to the limitation described therein.
 
    Code  Section 1286 treats a stripped bond  or a stripped coupon generally as
an obligation  issued  at an  original  issue discount  on  the date  that  such
stripped  interest is purchased. Although the treatment of Stripped Certificates
for federal income tax purposes is not  clear in certain respects at this  time,
particularly  where  such Stripped  Certificates are  issued  with respect  to a
Mortgage Pool  containing  variable-rate Mortgage  Loans,  the Seller  has  been
advised  by counsel that (i) the Trust Estate will be treated as a grantor trust
under subpart E, Part I  of subchapter J of the  Code and not as an  association
taxable as a corporation or a "taxable mortgage pool" within the meaning of Code
Section  7701(i),  and (ii)  each Stripped  Certificate should  be treated  as a
single  installment  obligation  for  purposes  of  calculating  original  issue
discount  and  gain or  loss  on disposition.  This  treatment is  based  on the
interrelationship of Code Section 1286, Code Sections 1272 through 1275, and the
OID Regulations.  Although it  is  possible that  computations with  respect  to
Stripped  Certificates could be  made in one  of the ways  described below under
"Taxation of Stripped Certificates  -- Possible Alternative  Characterizations,"
the  OID Regulations state, in general, that two or more debt instruments issued
by a  single issuer  to a  single investor  in a  single transaction  should  be
treated as a single debt instrument. Accordingly, for OID purposes, all payments
on  any Stripped  Certificates should be  aggregated and treated  as though they
were made on a single debt instrument. The Pooling and Servicing Agreement  will
require  that the Trustee make and report all computations described below using
this aggregate approach, unless substantial legal authority requires otherwise.
 
    Furthermore, Treasury  regulations  issued  December 28,  1992  provide  for
treatment  of a Stripped Certificate  as a single debt  instrument issued on the
date it is purchased for purposes of calculating any original issue discount. In
addition, under  these regulations,  a Stripped  Certificate that  represents  a
right  to payments of both interest and principal may be viewed either as issued
with original issue discount  or market discount (as  described below), at a  DE
MINIMIS  original issue discount,  or, presumably, at  a premium. This treatment
indicates that the interest  component of such a  Stripped Certificate would  be
treated  as qualified stated interest under  the OID Regulations, assuming it is
not an interest-only or super-premium Stripped Certificate. Further, these final
regulations provide that the  purchaser of such a  Stripped Certificate will  be
required  to account  for any discount  as market discount  rather than original
issue discount if either (i) the  initial discount with respect to the  Stripped
Certificate  was treated as zero under the DE MINIMIS rule, or (ii) no more than
100 basis points in excess of  reasonable servicing is stripped off the  related
Mortgage  Loans. Any such market discount would be reportable as described above
under "Federal Income  Tax Consequences  for REMIC Certificates  -- Taxation  of
Regular  Certificates -- Market Discount," without regard to the DE MINIMIS rule
therein, assuming that a prepayment assumption is employed in such computation.
 
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<PAGE>
    STATUS OF STRIPPED CERTIFICATES
 
    No specific  legal authority  exists  as to  whether  the character  of  the
Stripped Certificates, for federal income tax purposes, will be the same as that
of  the Mortgage Loans. Although  the issue is not  free from doubt, counsel has
advised the Seller that Stripped Certificates owned by applicable holders should
be considered to represent "qualifying  real property loans" within the  meaning
of  Code  Section 593(d)(1),  "real estate  assets" within  the meaning  of Code
Section 856(c)(5)(A),  "obligation[s]...principally secured  by an  interest  in
real   property"  within  the   meaning  of  Code   Section  860G(a)(3)(A),  and
"loans...secured by an  interest in real  property" within the  meaning of  Code
Section  7701(a)(19)(C)(v),  and  interest (including  original  issue discount)
income attributable to Stripped Certificates  should be considered to  represent
"interest  on  obligations secured  by mortgages  on  real property"  within the
meaning of Code Section  856(c)(3)(B), provided that in  each case the  Mortgage
Loans  and  interest on  such  Mortgage Loans  qualify  for such  treatment. The
application of  such  Code  provisions  to  Buy-Down  Loans  is  uncertain.  See
"Certificates -- Tax Status" above.
 
    TAXATION OF STRIPPED CERTIFICATES
 
    ORIGINAL  ISSUE DISCOUNT.   Except as described  above under "General," each
Stripped Certificate will be considered to have been issued at an original issue
discount for federal income tax  purposes. Original issue discount with  respect
to  a Stripped Certificate must be included in ordinary income as it accrues, in
accordance  with  a  constant  interest  method  that  takes  into  account  the
compounding  of  interest,  which  may  be prior  to  the  receipt  of  the cash
attributable to  such income.  Based in  part  on the  OID Regulations  and  the
amendments  to the original issue discount sections of the Code made by the 1986
Act, the amount of original issue discount required to be included in the income
of a holder  of a  Stripped Certificate  (referred to  in this  discussion as  a
"Stripped  Certificateholder")  in  any  taxable year  likely  will  be computed
generally as described above  under "Federal Income  Tax Consequences for  REMIC
Certificates -- Taxation of Regular Certificates -- Original Issue Discount" and
"-- Variable Rate Regular Certificates." However, with the apparent exception of
a  Stripped  Certificate  issued  with DE  MINIMIS  original  issue  discount as
described above under "General," the issue price of a Stripped Certificate  will
be  the purchase price  paid by each  holder thereof, and  the stated redemption
price at maturity will include the aggregate  amount of the payments to be  made
on the Stripped Certificate to such Stripped Certificateholder, presumably under
the Prepayment Assumption, other than qualified stated interest.
 
    If  the Mortgage Loans  prepay at a  rate either faster  or slower than that
under the Prepayment Assumption,  a Stripped Certificateholder's recognition  of
original issue discount will be either accelerated or decelerated and the amount
of  such original issue discount will be either increased or decreased depending
on the  relative interests  in  principal and  interest  on each  Mortgage  Loan
represented by such Stripped Certificateholder's Stripped Certificate. While the
matter  is not free from  doubt, the holder of  a Stripped Certificate should be
entitled in the year that it  becomes certain (assuming no further  prepayments)
that  the  holder will  not  recover a  portion of  its  adjusted basis  in such
Stripped Certificate to recognize a loss (which may be a capital loss) equal  to
such portion of unrecoverable basis.
 
    As  an alternative to the method described  above, the fact that some or all
of the interest payments with respect  to the Stripped Certificates will not  be
made  if the Mortgage  Loans are prepaid  could lead to  the interpretation that
such  interest  payments  are  "contingent"  within  the  meaning  of  the   OID
Regulations.  The OID Regulations, as they relate to the treatment of contingent
interest, are by their terms not applicable to prepayable securities such as the
Stripped Certificates.  However, if  final regulations  dealing with  contingent
interest  with respect to the Stripped Certificates apply the same principles as
the OID Regulations,  such regulations may  lead to different  timing of  income
inclusion  than  would  be  the case  under  the  OID  Regulations. Furthermore,
application of such principles could lead to the characterization of gain on the
sale of contingent interest Stripped Certificates as ordinary income.  Investors
should  consult their  tax advisors regarding  the appropriate  tax treatment of
Stripped Certificates.
 
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    SALE OR EXCHANGE OF STRIPPED CERTIFICATES.   Sale or exchange of a  Stripped
Certificate  prior to  its maturity  will result  in gain  or loss  equal to the
difference,  if   any,   between   the  amount   received   and   the   Stripped
Certificateholder's  adjusted basis  in such Stripped  Certificate, as described
above under "Federal Income Tax Consequences for REMIC Certificates --  Taxation
of  Regular Certificates  -- Sale or  Exchange of Regular  Certificates." To the
extent that a subsequent purchaser's purchase price is exceeded by the remaining
payments on  the  Stripped  Certificates,  such  subsequent  purchaser  will  be
required  for federal income tax purposes to accrue and report such excess as if
it were original issue discount in the  manner described above. It is not  clear
for  this purpose whether the assumed prepayment rate  that is to be used in the
case  of  a   Stripped  Certificateholder  other   than  an  original   Stripped
Certificateholder should be the Prepayment Assumption or a new rate based on the
circumstances at the date of subsequent purchase.
 
    PURCHASE  OF MORE THAN ONE CLASS OF STRIPPED CERTIFICATES.  When an investor
purchases more than one Class of Stripped Certificates, it is currently  unclear
whether  for federal income  tax purposes such  Classes of Stripped Certificates
should be treated separately or aggregated  for purposes of the rules  described
above.
 
    POSSIBLE  ALTERNATIVE  CHARACTERIZATIONS.    The  characterizations  of  the
Stripped Certificates discussed above are not the only possible  interpretations
of  the applicable Code provisions.  For example, the Stripped Certificateholder
may be treated as the owner of (i) one installment obligation consisting of such
Stripped Certificate's pro rata share of the payments attributable to  principal
on  each Mortgage  Loan and a  second installment obligation  consisting of such
Stripped Certificate's pro rata share  of the payments attributable to  interest
on  each Mortgage Loan, (ii) as many stripped bonds or stripped coupons as there
are scheduled payments of  principal and/or interest on  each Mortgage Loan,  or
(iii) a separate installment obligation for each Mortgage Loan, representing the
Stripped  Certificate's pro rata share of  payments of principal and/or interest
to be  made with  respect thereto.  Alternatively,  the holder  of one  or  more
Classes  of Stripped  Certificates may  be treated  as the  owner of  a pro rata
fractional undivided interest  in each  Mortgage Loan  to the  extent that  such
Stripped  Certificate,  or Classes  of Stripped  Certificates in  the aggregate,
represent the  same pro  rata portion  of principal  and interest  on each  such
Mortgage  Loan, and  a stripped bond  or stripped  coupon (as the  case may be),
treated as an installment obligation or contingent payment obligation, as to the
remainder. Final  regulations issued  on December  28, 1992  regarding  original
issue  discount on stripped obligations  make the foregoing interpretations less
likely to be applicable. The preamble to those regulations states that they  are
premised  on  the assumption  that an  aggregation  approach is  appropriate for
determining whether  original issue  discount  on a  stripped bond  or  stripped
coupon is DE MINIMIS, and solicits comments on appropriate rules for aggregating
stripped bonds and stripped coupons under Code Section 1286.
 
    Because of these possible varying characterizations of Stripped Certificates
and   the  resultant   differing  treatment  of   income  recognition,  Stripped
Certificateholders are urged  to consult  their own tax  advisors regarding  the
proper treatment of Stripped Certificates for federal income tax purposes.
 
REPORTING REQUIREMENTS AND BACKUP WITHHOLDING
 
    The  Master Servicer will furnish, within a reasonable time after the end of
each calendar year, to each  Certificateholder or Stripped Certificateholder  at
any  time during  such year, such  information (prepared on  the basis described
above) as  is  necessary to  enable  such Certificateholders  to  prepare  their
federal income tax returns. Such information will include the amount of original
issue   discount   accrued  on   Certificates   held  by   persons   other  than
Certificateholders exempted from the reporting requirements. The amount required
to be reported by the Master Servicer may  not be equal to the proper amount  of
original  issue  discount  required  to  be  reported  as  taxable  income  by a
Certificateholder, other than  an original Certificateholder  that purchased  at
the  issue price.  In particular, in  the case of  Stripped Certificates, unless
provided otherwise in the applicable Prospectus Supplement, such reporting  will
be  based upon a representative initial offering price of each Class of Stripped
Certificates. The Master Servicer  will also file  such original issue  discount
information with the
 
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Internal  Revenue Service.  If a Certificateholder  fails to  supply an accurate
taxpayer identification number or  if the Secretary  of the Treasury  determines
that  a  Certificateholder has  not reported  all  interest and  dividend income
required to be shown  on his federal income  tax return, 31% backup  withholding
may  be required in respect of any reportable payments, as described above under
"Federal Income Tax Consequences for REMIC Certificates -- Backup Withholding."
 
TAXATION OF CERTAIN FOREIGN INVESTORS
 
    To the extent that a Certificate evidences ownership in Mortgage Loans  that
are  issued on or before July 18, 1984, interest or original issue discount paid
by the  person required  to withhold  tax under  Code Section  1441 or  1442  to
nonresident  aliens, foreign  corporations, or other  non-U.S. persons ("foreign
persons") generally will  be subject to  30% United States  withholding tax,  or
such  lower rate as  may be provided  for interest by  an applicable tax treaty.
Accrued original issue discount recognized by the Certificateholder on the  sale
or  exchange of such a Certificate also will be subject to federal income tax at
the same rate.
 
    Treasury regulations provide that interest  or original issue discount  paid
by  the  Trustee  or other  withholding  agent  to a  foreign  person evidencing
ownership interest  in  Mortgage  Loans  issued after  July  18,  1984  will  be
"portfolio interest" and will be treated in the manner, and such persons will be
subject  to the same certification  requirements, described above under "Federal
Income Tax Consequences for  REMIC Certificates --  Taxation of Certain  Foreign
Investors -- Regular Certificates."
 
                              ERISA CONSIDERATIONS
 
GENERAL
 
    The  Employee Retirement Income Security Act  of 1974, as amended ("ERISA"),
imposes certain requirements on those employee benefit plans to which it applies
("Plans") and on those persons who  are fiduciaries with respect to such  Plans.
The  following  is  a  general  discussion  of  such  requirements,  and certain
applicable exceptions to and  administrative exemptions from such  requirements.
For  purposes of this discussion, a person  investing on behalf of an individual
retirement account established under Code Section 408 (an "IRA") is regarded  as
a fiduciary and the IRA as a Plan.
 
    Before purchasing any Certificates, a Plan fiduciary should consult with its
counsel  and determine  whether there  exists any  prohibition to  such purchase
under the requirements of ERISA, whether prohibited transaction exemptions  such
as  PTE 83-1  or any  individual administrative  exemption (as  described below)
applies, including whether the appropriate conditions set forth therein would be
met, or whether  any statutory prohibited  transaction exemption is  applicable,
and further should consult the applicable Prospectus Supplement relating to such
Series of Certificates.
 
CERTAIN REQUIREMENTS UNDER ERISA
 
    GENERAL.   In  accordance with  ERISA's general  fiduciary standards, before
investing in a Certificate a Plan fiduciary should determine whether to do so is
permitted under the governing Plan instruments  and is appropriate for the  Plan
in view of its overall investment policy and the composition and diversification
of  its  portfolio.  A  Plan  fiduciary  should  especially  consider  the ERISA
requirement of investment  prudence and  the sensitivity  of the  return on  the
Certificates  to the rate of principal repayments (including prepayments) on the
Mortgage Loans, as discussed in "Prepayment and Yield Considerations" herein.
 
    PARTIES IN INTEREST/DISQUALIFIED  PERSONS.  Other  provisions of ERISA  (and
corresponding  provisions of  the Code) prohibit  certain transactions involving
the assets of a Plan and persons who have certain specified relationships to the
Plan  (so-called  "parties  in  interest"   within  the  meaning  of  ERISA   or
"disqualified  persons" within the meaning of  the Code). The Seller, the Master
Servicer or Master Servicer or the  Trustee or certain affiliates thereof  might
be  considered or might  become "parties in  interest" or "disqualified persons"
with   respect   to   a    Plan.   If   so,    the   acquisition   or    holding
 
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<PAGE>
of Certificates by or on behalf of such Plan could be considered to give rise to
a  "prohibited transaction" within the  meaning of ERISA and  the Code unless an
administrative exemption described below or some other exemption is available.
 
    Special caution should be exercised before  the assets of a Plan  (including
assets  that may be held in an  insurance company's separate or general accounts
where assets in such accounts may be  deemed Plan assets for purposes of  ERISA)
are  used to purchase a Certificate if, with respect to such assets, the Seller,
the Master Servicer or  Master Servicer or the  Trustee or an affiliate  thereof
either:  (a) has  investment discretion with  respect to the  investment of such
assets of  such  Plan;  or (b)  has  authority  or responsibility  to  give,  or
regularly  gives, investment advice  with respect to  such assets for  a fee and
pursuant to  an agreement  or understanding  that such  advice will  serve as  a
primary basis for investment decisions with respect to such assets and that such
advice will be based on the particular investment needs of the Plan.
 
    DELEGATION  OF FIDUCIARY DUTY.   Further, if the assets  included in a Trust
Estate were  deemed to  constitute Plan  assets, it  is possible  that a  Plan's
investment in the Certificates might be deemed to constitute a delegation, under
ERISA,  of the duty to manage Plan assets by the fiduciary deciding to invest in
the Certificates,  and certain  transactions involved  in the  operation of  the
Trust  Estate might be deemed to  constitute prohibited transactions under ERISA
and the Code. Neither ERISA nor the Code define the term "plan assets."
 
    The U.S. Department of Labor (the "Department") has issued regulations  (the
"Regulations")  concerning whether  or not  a Plan's  assets would  be deemed to
include an interest  in the  underlying assets  of an  entity (such  as a  Trust
Estate)  for  purposes of  the reporting  and  disclosure and  general fiduciary
responsibility provisions of ERISA,  as well as  for the prohibited  transaction
provisions  of ERISA  and the  Code, if the  Plan acquires  an "equity interest"
(such as a Certificate) in such an entity.
 
    Certain exceptions  are provided  in the  Regulations whereby  an  investing
Plan's assets would be deemed merely to include its interest in the Certificates
instead  of being deemed to include an interest in the assets of a Trust Estate.
However, it  cannot be  predicted in  advance nor  can there  be any  continuing
assurance  whether such exceptions may be met,  because of the factual nature of
certain of the  rules set  forth in  the Regulations.  For example,  one of  the
exceptions  in the  Regulations states that  the underlying assets  of an entity
will not  be considered  "plan assets"  if less  than 25%  of the  value of  all
classes  of equity  interests are  held by  "benefit plan  investors," which are
defined as Plans,  IRAs, and employee  benefit plans not  subject to ERISA  (for
example,  governmental plans),  but this  exception is  tested immediately after
each acquisition  of an  equity  interest in  the  entity whether  upon  initial
issuance or in the secondary market.
 
ADMINISTRATIVE EXEMPTIONS
 
    INDIVIDUAL    ADMINISTRATIVE   EXEMPTIONS.       Several   underwriters   of
mortgage-backed securities  have  applied  for  and  obtained  ERISA  prohibited
transaction  exemptions (each, an  "Underwriter's Exemption") which  are in some
respects broader  than Prohibited  Transaction Class  Exemption 83-1  (described
below).  Such  exemptions can  only apply  to mortgage-backed  securities which,
among other  conditions, are  sold in  an offering  with respect  to which  such
underwriter  serves as the  sole or a  managing underwriter, or  as a selling or
placement agent. If  such an Underwriter's  Exemption might be  applicable to  a
Series  of Certificates, the applicable Prospectus Supplement will refer to such
possibility.
 
    Among the conditions that must  be satisfied for an Underwriter's  Exemption
to apply are the following:
 
       (1) The  acquisition of Certificates by a Plan is on terms (including the
           price for the  Certificates) that are  at least as  favorable to  the
    Plan  as they  would be  in an  arm's length  transaction with  an unrelated
    party;
 
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<PAGE>
       (2) The rights and  interests evidenced by  Certificates acquired by  the
           Plan  are not subordinated  to the rights  and interests evidenced by
    other Certificates of the Trust Estate;
 
       (3) The Certificates acquired by the Plan  have received a rating at  the
           time  of such  acquisition that is  one of the  three highest generic
    rating categories from either Standard  & Poor's ("S&P"), Moody's  Investors
    Service,  Inc. ("Moody's"), Duff & Phelps Credit Rating Co. ("DCR") or Fitch
    Investors Service, L.P. ("Fitch");
 
       (4) The Trustee  must not  be an  affiliate of  any other  member of  the
           Restricted Group (as defined below);
 
       (5) The  sum of all payments  made to and retained  by the underwriter in
           connection with the distribution of Certificates represents not  more
    than  reasonable compensation for underwriting  the Certificates. The sum of
    all payments made to and retained  by the Seller pursuant to the  assignment
    of  the Mortgage Loans to the Trust Estate represents not more than the fair
    market value of such  Mortgage Loans. The  sum of all  payments made to  and
    retained  by the Servicer (and any  other servicer) represents not more than
    reasonable compensation for  such person's  services under  the Pooling  and
    Servicing  Agreement and reimbursement of  such person's reasonable expenses
    in connection therewith; and
 
       (6) The Plan investing in the Certificates is an "accredited investor" as
           defined in  Rule 501(a)(1)  of  Regulation D  of the  Securities  and
    Exchange Commission under the Securities Act of 1933.
 
    The Trust Estate must also meet the following requirements:
 
              (i)
               the  assets of the Trust Estate  must consist solely of assets of
               the type that have been included in other investment pools in the
       marketplace;
 
             (ii)
               certificates in such other investment pools must have been  rated
               in  one of the  three highest rating  categories of S&P, Moody's,
       Fitch or DCR for at least one year prior to the Plan's acquisition of the
       Certificates; and
 
            (iii)
               certificates evidencing interests in such other investment  pools
               must  have been  purchased by investors  other than  Plans for at
       least one year prior to any Plan's acquisition of the Certificates.
 
    If the conditions to  an Underwriter's Exemption are  met, whether or not  a
Plan's  assets would be deemed to include  an ownership interest in the Mortgage
Loans  in  a  mortgage  pool,  the  acquisition,  holding  and  resale  of   the
Certificates by Plans would be exempt from the prohibited transaction provisions
of ERISA and the Code.
 
    Moreover,  an  Underwriter's  Exemption  can  provide  relief  from  certain
self-dealing/conflict of interest  prohibited transactions that  may occur if  a
Plan  fiduciary causes a Plan to acquire Certificates in a Trust Estate in which
the fiduciary (or its affiliate) is an obligor on the Mortgage Loans held in the
Trust Estate provided  that, among  other requirements: (i)  in the  case of  an
acquisition  in connection with  the initial issuance  of Certificates, at least
fifty percent of  each class  of Certificates in  which Plans  have invested  is
acquired  by  persons independent  of the  Restricted Group  and at  least fifty
percent of the  aggregate interest in  the Trust Estate  is acquired by  persons
independent  of the Restricted Group (as defined below); (ii) such fiduciary (or
its affiliate) is an obligor  with respect to five percent  or less of the  fair
market  value of  the Mortgage  Loans contained in  the Trust  Estate; (iii) the
Plan's investment  in Certificates  of  any Class  does not  exceed  twenty-five
percent  of all of the Certificates of that Class outstanding at the time of the
acquisition and (iv) immediately after the acquisition no more than  twenty-five
percent  of  the assets  of the  Plan with  respect  to which  such person  is a
fiduciary are invested in Certificates representing  an interest in one or  more
trusts containing assets sold or served by the same entity.
 
                                       95
<PAGE>
    An  Underwriter's Exemption does not apply to Plans sponsored by the Seller,
the underwriter specified  in the applicable  Prospectus Supplement, the  Master
Servicer,  the Trustee, the Servicer, any obligor with respect to Mortgage Loans
included in  the  Trust  Estate  constituting more  than  five  percent  of  the
aggregate  unamortized principal balance  of the assets in  the Trust Estate, or
any affiliate of such parties (the "Restricted Group").
 
    PTE  83-1.    Prohibited  Transaction  Class  Exemption  83-1  for   Certain
Transactions  Involving  Mortgage Pool  Investment  Trusts ("PTE  83-1") permits
certain transactions  involving the  creation,  maintenance and  termination  of
certain  residential mortgage pools  and the acquisition  and holding of certain
residential mortgage pool pass-through certificates by Plans, whether or not the
Plan's assets would be deemed to include an ownership interest in the  mortgages
in  such mortgage pools, and whether or not such transactions would otherwise be
prohibited under ERISA.
 
    The term "mortgage pool pass-through certificate" is defined in PTE 83-1  as
"a  certificate  representing a  beneficial undivided  fractional interest  in a
mortgage pool and  entitling the holder  of such a  certificate to  pass-through
payment  of principal and interest from the pooled mortgage loans, less any fees
retained by the pool sponsor."  It appears that, for  purposes of PTE 83-1,  the
term  "mortgage pool pass-through certificate" would include Certificates issued
in a single Class or in multiple Classes that evidence the beneficial  ownership
of  both a  specified percentage  of future  interest payments  (after permitted
deductions) and a specified percentage of  future principal payments on a  Trust
Estate.
 
    However,  it appears that PTE  83-1 does or might  not apply to the purchase
and holding of (a) Certificates that evidence the beneficial ownership only of a
specified percentage of future interest payments (after permitted deductions) on
a Trust Estate or only of a specified percentage of future principal payments on
a Trust Estate, (b) Residual Certificates, (c) Certificates evidencing ownership
interests in a Trust Estate which includes Mortgage Loans secured by multifamily
residential properties or shares issued by cooperative housing corporations,  or
(d) Certificates which are subordinated to other Classes of Certificates of such
Series.  Accordingly, unless exemptive relief other than PTE 83-1 applies, Plans
should not purchase any such Certificates.
 
    PTE 83-1 sets forth  "general conditions" and  "specific conditions" to  its
applicability.  Section  II  of  PTE  83-1  sets  forth  the  following  general
conditions to the application of the exemption: (i) the maintenance of a  system
of  insurance or other protection for the  pooled mortgage loans or the property
securing such loans, and for indemnifying certificateholders against  reductions
in  pass-through payments due  to property damage or  defaults in loan payments;
(ii) the  existence of  a pool  trustee  who is  not an  affiliate of  the  pool
sponsor;  and  (iii) a  requirement that  the sum  of all  payments made  to and
retained by the pool sponsor, and all  funds inuring to the benefit of the  pool
sponsor  as a result of the administration  of the mortgage pool, must represent
not more  than  adequate  consideration  for selling  the  mortgage  loans  plus
reasonable  compensation for services provided by  the pool sponsor to the pool.
The system  of insurance  or protection  referred to  in clause  (i) above  must
provide  such protection and indemnification  up to an amount  not less than the
greater of one percent of the  aggregate unpaid principal balance of the  pooled
mortgages  or the unpaid principal balance of  the largest mortgage in the pool.
It should be noted that in promulgating PTE 83-1 (and a predecessor  exemption),
the  Department did not have  under its consideration interests  in pools of the
exact nature as some of the Certificates described herein.
 
EXEMPT PLANS
 
    Employee benefit plans which are  governmental plans (as defined in  Section
3(32) of ERISA), and certain church plans (as defined in Section 3(33) of ERISA)
are  not subject to ERISA requirements and  assets of such plans may be invested
in Certificates without regard to  the ERISA considerations described above  but
such  plans may  be subject  to the provisions  of other  applicable federal and
state law.
 
                                       96
<PAGE>
UNRELATED BUSINESS TAXABLE INCOME -- RESIDUAL CERTIFICATES
 
    The purchase  of  a  Residual  Certificate  by  any  employee  benefit  plan
qualified  under Code Section 401(a) and exempt from taxation under Code Section
501(a), including most  varieties of ERISA  Plans, may give  rise to  "unrelated
business  taxable  income"  as  described in  Code  Sections  511-515  and 860E.
Further,  prior  to  the  purchase  of  Residual  Certificates,  a   prospective
transferee  may be required to  provide an affidavit to  a transferor that it is
not, nor is it purchasing a  Residual Certificate on behalf of, a  "Disqualified
Organization,"  which term as defined above includes certain tax-exempt entities
not subject to Code Section 511 such as certain governmental plans, as discussed
above under  the caption  "Certain Federal  Income Tax  Consequences --  Federal
Income   Tax  Consequences  for  REMIC  Certificates  --  Taxation  of  Residual
Certificates -- Tax-Related Restrictions on Transfer of Residual Certificates --
Disqualified Organizations."
 
    DUE TO THE COMPLEXITY OF THESE RULES AND THE PENALTIES IMPOSED UPON  PERSONS
INVOLVED IN PROHIBITED TRANSACTIONS, IT IS PARTICULARLY IMPORTANT THAT POTENTIAL
INVESTORS  WHO ARE  PLAN FIDUCIARIES  CONSULT WITH  THEIR COUNSEL  REGARDING THE
CONSEQUENCES UNDER ERISA OF THEIR ACQUISITION AND OWNERSHIP OF CERTIFICATES.
 
    THE SALE OF CERTIFICATES TO A PLAN IS IN NO RESPECT A REPRESENTATION BY  THE
SELLER  OR THE  APPLICABLE UNDERWRITER THAT  THIS INVESTMENT  MEETS ALL RELEVANT
LEGAL REQUIREMENTS  WITH  RESPECT  TO  INVESTMENTS BY  PLANS  GENERALLY  OR  ANY
PARTICULAR  PLAN, OR THAT THIS INVESTMENT  IS APPROPRIATE FOR PLANS GENERALLY OR
ANY PARTICULAR PLAN.
 
                                LEGAL INVESTMENT
 
    As will  be  specified  in the  applicable  Prospectus  Supplement,  certain
Classes  of  Certificates  will  constitute  "mortgage  related  securities" for
purposes of the Secondary Mortgage Market  Enhancement Act of 1984 ("SMMEA")  so
long  as they are rated in one of  the two highest rating categories by at least
one Rating Agency. As "mortgage related securities" such Classes will constitute
legal investments for persons, trusts, corporations, partnerships, associations,
business  trusts  and   business  entities   (including  but   not  limited   to
state-chartered  savings banks, commercial banks,  savings and loan associations
and insurance  companies, as  well  as trustees  and state  government  employee
retirement systems) created pursuant to or existing under the laws of the United
States  or of  any state  (including the District  of Columbia  and Puerto Rico)
whose authorized investments are subject to state regulation to the same  extent
that,  under applicable law, obligations issued by or guaranteed as to principal
and interest  by the  United States  or any  agency or  instrumentality  thereof
constitute  legal investments for such entities.  Pursuant to SMMEA, a number of
states enacted legislation, on  or before the October  3, 1991 cut-off for  such
enactments,  limiting to  varying extents  the ability  of certain  entities (in
particular, SMMEA insurance companies) to invest in mortgage related securities,
in most cases by requiring the  affected investors to rely solely upon  existing
state   law,  and  not  SMMEA.  Accordingly,  the  investors  affected  by  such
legislation will be authorized to invest in the Certificates only to the  extent
provided in such legislation.
 
    SMMEA  also amended  the legal  investment authority  of federally-chartered
depository institutions as  follows: federal savings  and loan associations  and
federal  savings  banks may  invest  in, sell  or  otherwise deal  with mortgage
related securities  without limitation  as  to the  percentage of  their  assets
represented  thereby,  federal  credit  unions may  invest  in  mortgage related
securities, and  national banks  may purchase  mortgage related  securities  for
their  own account  without regard  to the  limitations generally  applicable to
investment securities set forth  in 12 U.S.C. Section  24 (Seventh), subject  in
each case to such regulations as the applicable federal regulatory authority may
prescribe.  In  this connection,  federal credit  unions should  review National
Credit Union Administration ("NCUA") Letter to Credit Unions No. 96, as modified
by Letter to Credit Unions No. 108, which includes guidelines to assist  federal
credit  unions in making  investment decisions for  mortgage related securities.
The NCUA has adopted  rules, codified as 12  C.F.R. Section 703.5(f)-(k),  which
prohibit  federal  credit  unions  from investing  in  certain  mortgage related
securities (such as  the Residual Certificates  and the Stripped  Certificates),
except under limited circumstances.
 
                                       97
<PAGE>
    All  depository institutions  considering an investment  in the Certificates
should review the "Supervisory Policy Statement on Securities Activities"  dated
January  28, 1992,  as revised  April 15, 1994  (the "Policy  Statement") of the
Federal Financial Institutions Examination Council. The Policy Statement,  which
has  been adopted by the  Board of Governors of  the Federal Reserve System, the
Federal Deposit Insurance Corporation, the  Comptroller of the Currency and  the
Office  of  Thrift Supervision  and by  the  NCUA (with  certain modifications),
prohibits depository institutions from investing in certain "high-risk  mortgage
securities"  (including securities  such as  certain Series  and Classes  of the
Certificates), except  under  limited  circumstances,  and  sets  forth  certain
investment practices deemed to be unsuitable for regulated institutions.
 
    Institutions  whose  investment  activities  are  subject  to  regulation by
federal or  state  authorities  should review  rules,  policies  and  guidelines
adopted  from time  to time  by such  authorities before  purchasing any  of the
Certificates, as certain  Series or Classes  (in particular, Certificates  which
are  entitled  solely or  disproportionately  to distributions  of  principal or
interest) may be deemed unsuitable investments, or may otherwise be  restricted,
under  such rules, policies or guidelines  (in certain instances irrespective of
SMMEA).
 
    The  foregoing  does  not  take  into  consideration  the  applicability  of
statutes,   rules,  regulations,  orders,  guidelines  or  agreements  generally
governing investments made by a particular investor, including, but not  limited
to, "prudent investor" provisions, percentage-of-assets limits, provisions which
may   restrict   or   prohibit   investment   in   securities   which   are  not
"interest-bearing" or  "income-paying," and,  with  regard to  any  Certificates
issued in book-entry form, provisions which may restrict or prohibit investments
in securities which are issued in book-entry form.
 
    Except  as to  the status  of certain  Classes of  Certificates as "mortgage
related securities," no representation is made as to the proper characterization
of  the  Certificates  for  legal  investment  purposes,  financial  institution
regulatory  purposes,  or other  purposes, or  as to  the ability  of particular
investors  to   purchase   Certificates  under   applicable   legal   investment
restrictions.  The  uncertainties described  above  (and any  unfavorable future
determinations concerning legal investment  or financial institution  regulatory
characteristics  of the Certificates) may adversely  affect the liquidity of the
Certificates.
 
    All investors should consult  with their own  legal advisors in  determining
whether  and to  what extent the  Certificates constitute  legal investments for
such investors.
 
                              PLAN OF DISTRIBUTION
 
    The Certificates are being offered hereby  in Series through one or more  of
the  methods  described below.  The  applicable Prospectus  Supplement  for each
Series will describe the method of  offering being utilized for that Series  and
will  state the public offering or purchase  price of each Class of Certificates
of such Series, or the method by which  such price is to be determined, and  the
net proceeds to the Seller from such sale.
 
    The  Certificates will be offered through the following methods from time to
time and  offerings may  be made  concurrently through  more than  one of  these
methods  or  an offering  of a  particular  Series of  Certificates may  be made
through a combination of two or more of these methods:
 
       1.  By negotiated firm commitment underwriting and public re-offering  by
           underwriters specified in the applicable Prospectus Supplement;
 
       2.  By placements by the Seller with investors through dealers; and
 
       3.  By direct placements by the Seller with investors.
 
    If  underwriters are used  in a sale of  any Certificates, such Certificates
will be acquired by  the underwriters for  their own account  and may be  resold
from   time  to  time   in  one  or   more  transactions,  including  negotiated
transactions, at  a fixed  public offering  price  or at  varying prices  to  be
determined  at the  time of  sale or  at the  time of  commitment therefor. Firm
commitment underwriting and public
 
                                       98
<PAGE>
reoffering by  underwriters  may  be done  through  underwriting  syndicates  or
through  one or  more firms acting  alone. The specific  managing underwriter or
underwriters, if any, with respect to the offer and sale of a particular  Series
of  Certificates will  be set  forth on the  cover of  the Prospectus Supplement
applicable to such Series and the members of the underwriting syndicate, if any,
will be  named in  such Prospectus  Supplement. The  Prospectus Supplement  will
describe  any discounts and commissions  to be allowed or  paid by the Seller to
the underwriters, any other items constituting underwriting compensation and any
discounts and commissions to be allowed or paid to the dealers. The  obligations
of  the  underwriters  will  be subject  to  certain  conditions  precedent. The
underwriters with  respect  to a  sale  of any  Class  of Certificates  will  be
obligated  to purchase all  such Certificates if any  are purchased. The Seller,
and, if specified  in the  applicable Prospectus  Supplement, Norwest  Mortgage,
will  indemnify the  applicable underwriters against  certain civil liabilities,
including liabilities under the Securities Act.
 
    The Prospectus Supplement with respect to any Series of Certificates offered
other than through underwriters will contain information regarding the nature of
such offering  and any  agreements to  be entered  into between  the Seller  and
dealers and/or the Seller and purchasers of Certificates of such Series.
 
    Purchasers  of Certificates, including dealers,  may, depending on the facts
and circumstances of such purchases, be  deemed to be "underwriters" within  the
meaning  of the Securities Act in connection  with reoffers and sales by them of
Certificates. Certificateholders  should consult  with their  legal advisors  in
this regard prior to any such reoffer or sale.
 
    If   specified  in  the  Prospectus  Supplement  relating  to  a  Series  of
Certificates, the Seller or  any affiliate thereof may  purchase some or all  of
one  or more  Classes of  Certificates of  such Series  from the  underwriter or
underwriters at a price  specified or described  in such Prospectus  Supplement.
Such purchaser may thereafter from time to time offer and sell, pursuant to this
Prospectus,  some or all of such Certificates so purchased directly, through one
or more  underwriters to  be designated  at the  time of  the offering  of  such
Certificates  or through dealers acting as agent and/or principal. Such offering
may be restricted in  the matter specified in  such Prospectus Supplement.  Such
transactions may be effected at market prices prevailing at the time of sale, at
negotiated prices or at fixed prices. The underwriters and dealers participating
in  such purchaser's offering  of such Certificates  may receive compensation in
the form of underwriting discounts or  commissions from such purchaser and  such
dealers  may receive commissions from the investors purchasing such Certificates
for whom they may act as agent  (which discounts or commissions will not  exceed
those  customary  in  those types  of  transactions involved).  Any  dealer that
participates in the  distribution of such  Certificates may be  deemed to be  an
"underwriter"  within the meaning of the Securities Act, and any commissions and
discounts received  by  such  dealer  and  any profit  on  the  resale  of  such
Certificates  by such  dealer might be  deemed to be  underwriting discounts and
commissions under the Securities Act.
 
                                USE OF PROCEEDS
 
    The net proceeds from the sale of  each Series of Certificates will be  used
by  the  Seller  for the  purchase  of  the Mortgage  Loans  represented  by the
Certificates of such Series from Norwest  Mortgage. It is expected that  Norwest
Mortgage will use the proceeds from the sale of the Mortgage Loans to the Seller
for   its  general   business  purposes,  including,   without  limitation,  the
origination or acquisition of new mortgage loans and the repayment of borrowings
incurred to finance the origination or acquisition of mortgage loans,  including
the Mortgage Loans underlying the Certificates of such Series.
 
                                 LEGAL MATTERS
 
    Certain  legal  matters, including  the federal  income tax  consequences to
Certificateholders of an  investment in the  Certificates of a  Series, will  be
passed upon for the Seller by Cadwalader, Wickersham & Taft, New York.
 
                                       99
<PAGE>
                                     RATING
 
    It  is a condition to the issuance of the Certificates of any Series offered
pursuant to this Prospectus  and a Prospectus Supplement  that they be rated  in
one of the four highest categories by at least one Rating Agency.
 
    A  securities rating is not a recommendation to buy, sell or hold securities
and may be subject to revision or withdrawal at any time by the assigning Rating
Agency. Each securities rating  should be evaluated  independently of any  other
rating.
 
                                      100
<PAGE>
                        INDEX OF SIGNIFICANT DEFINITIONS
 
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Accrual Certificates.....................................................................................         35
Act......................................................................................................          2
Advances.................................................................................................         46
ALTA.....................................................................................................         25
Balloon Loan.............................................................................................         19
Balloon Period...........................................................................................         19
Bankruptcy Code..........................................................................................         62
Bankruptcy Loss..........................................................................................         37
Bankruptcy Loss Amount...................................................................................         37
Beneficial Owner.........................................................................................         32
Book-Entry Certificates..................................................................................         11
Buy-Down Fund............................................................................................         18
Buy-Down Loans...........................................................................................         18
Cede.....................................................................................................         32
CERCLA...................................................................................................         63
Certificate Account......................................................................................         43
Certificateholder........................................................................................         32
Certificates.............................................................................................      cover
Class....................................................................................................      cover
Cleanup Costs............................................................................................         63
Code.....................................................................................................         11
Commission...............................................................................................          2
Correspondents...........................................................................................         20
Credit Score.............................................................................................         22
DCR......................................................................................................         95
Deferred Interest........................................................................................         17
Definitive Certificates..................................................................................         11
Delegated Underwriting...................................................................................         21
Department...............................................................................................         94
Depository...............................................................................................         43
Detailed Information.....................................................................................          2
Disqualified Organization................................................................................         81
Distribution Date........................................................................................          9
DTC......................................................................................................         11
DTC Participants.........................................................................................         32
Due Date.................................................................................................         16
Due on Sale..............................................................................................         64
EDGAR....................................................................................................          2
Eligible Custodial Account...............................................................................         44
ERISA....................................................................................................         11
Excess Bankruptcy Losses.................................................................................         37
Excess Fraud Losses......................................................................................         37
Excess Special Hazard Losses.............................................................................         37
FDIC.....................................................................................................         44
FHLBB....................................................................................................         65
FHLMC....................................................................................................         25
Fitch....................................................................................................         95
Fixed Retained Yield.....................................................................................         35
FNMA.....................................................................................................         25
Fraud Loss...............................................................................................         37
</TABLE>
 
                                      101
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
Fraud Loss Amount........................................................................................         37
<S>                                                                                                        <C>
Garn Act.................................................................................................         65
GEMICO...................................................................................................         25
Indirect DTC Participants................................................................................         32
IRA......................................................................................................         93
Joint Ventures...........................................................................................         20
Liquidation Proceeds.....................................................................................         44
Loan Stores..............................................................................................         20
Master Servicer..........................................................................................      cover
Master Servicing Fee.....................................................................................         35
Moody's..................................................................................................         95
Mortgage Interest Rate...................................................................................         35
Mortgage Loans...........................................................................................      cover
Mortgage Notes...........................................................................................         15
Mortgaged Properties.....................................................................................         15
Mortgages................................................................................................         15
NASCOR...................................................................................................      cover
NCUA.....................................................................................................         98
Net Foreclosure Profits..................................................................................         35
1986 Act.................................................................................................         69
Non-Pro Rata Certificate.................................................................................         70
Non-U.S. Person..........................................................................................         85
Norwest Bank.............................................................................................      cover
Norwest Corporation......................................................................................         19
Norwest Funding..........................................................................................         19
Norwest Mortgage.........................................................................................      cover
Norwest Mortgage Loan....................................................................................         19
Norwest Mortgage Sale Agreement..........................................................................         53
OID Regulations..........................................................................................         70
Other Advances...........................................................................................         46
OTS......................................................................................................         65
Partial Liquidation Proceeds.............................................................................         34
Pass-Through Rate........................................................................................          9
Pass-Through Entity......................................................................................         81
Paying Agent.............................................................................................         46
Percentage Interest......................................................................................         34
Periodic Advances........................................................................................         10
PHMC.....................................................................................................         19
PHMC Mortgage Loans......................................................................................         19
Plans....................................................................................................         93
Policy Statement.........................................................................................         98
Pool Distribution Amount.................................................................................         34
Pool Insurers............................................................................................         25
Pooling and Servicing Agreement..........................................................................          8
Prepayment Assumption....................................................................................         71
Program Loans............................................................................................         42
Proposed Mark to Market Regulations......................................................................         83
PTE 83-1.................................................................................................         96
Qualified Mortgage.......................................................................................         30
Rating Agency............................................................................................         12
Record Date..............................................................................................         10
Regular Certificateholder................................................................................         69
</TABLE>
 
                                      102
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
Regular Certificates.....................................................................................         31
<S>                                                                                                        <C>
Regulations..............................................................................................         94
Relief Act...............................................................................................         63
REMIC....................................................................................................      cover
REMIC Certificates.......................................................................................         67
REMIC Pool...............................................................................................         67
REMIC Regulations........................................................................................         67
Remittance Date..........................................................................................         44
Reserve Fund.............................................................................................         38
Residual Certificates....................................................................................         31
Residual Holders.........................................................................................         76
Restricted Group.........................................................................................         96
Rules....................................................................................................         32
S&P......................................................................................................         95
Securities Act...........................................................................................          2
Seller...................................................................................................      cover
Senior Certificates......................................................................................      cover
Series...................................................................................................      cover
Servicer.................................................................................................      cover
Servicer Custodial Account...............................................................................         44
Servicing Account........................................................................................         47
Servicing Fee............................................................................................         35
SMMEA....................................................................................................         97
Special Hazard Loss......................................................................................         37
Special Hazard Loss Amounts..............................................................................         37
Standard Hazard Insurance Policy.........................................................................         49
Startup Day..............................................................................................         68
Stripped Certificateholder...............................................................................         91
Stripped Certificates....................................................................................         90
Subclass.................................................................................................      cover
Subordinated Certificates................................................................................      cover
Subsidy Account..........................................................................................         17
Subsidy Loans............................................................................................         17
Subsidy Payments.........................................................................................         17
Superlien................................................................................................         64
Title V..................................................................................................         66
T.O.P. Loans.............................................................................................         25
Treasury Regulations.....................................................................................         54
Trust Estate.............................................................................................      cover
Trustee..................................................................................................         59
Trustee Fee..............................................................................................         35
U.S. Person..............................................................................................         82
UCC......................................................................................................         61
UGRIC....................................................................................................         25
Underlying Servicing Agreement...........................................................................          8
Underwriter's Exemption..................................................................................         95
Voting Interests.........................................................................................         56
Window Period............................................................................................         65
Window Period Loans......................................................................................         65
Window Period States.....................................................................................         65
</TABLE>
 
                                      103
<PAGE>
- ---------------------------------------------------------
                       ---------------------------------------------------------
- ---------------------------------------------------------
                       ---------------------------------------------------------
 
    NO  DEALER, SALESMAN, OR  ANY OTHER PERSON  HAS BEEN AUTHORIZED  TO GIVE ANY
INFORMATION OR  TO MAKE  ANY  REPRESENTATION NOT  CONTAINED IN  THIS  PROSPECTUS
SUPPLEMENT  OR  THE  ACCOMPANYING  PROSPECTUS,  AND,  IF  GIVEN  OR  MADE,  SUCH
INFORMATION OR REPRESENTATION MUST NOT BE RELIED UPON AS HAVING BEEN  AUTHORIZED
BY THE SELLER, OR BY THE UNDERWRITER. NEITHER THIS PROSPECTUS SUPPLEMENT NOR THE
ACCOMPANYING  PROSPECTUS CONSTITUTES  AN OFFER TO  SELL OR A  SOLICITATION OF AN
OFFER TO BUY ANY  OF THE SECURITIES  OFFERED HEREBY IN  ANY JURISDICTION TO  ANY
PERSON  TO WHOM IT IS UNLAWFUL TO  MAKE SUCH OFFER IN SUCH JURISDICTION. NEITHER
THE DELIVERY OF THIS  PROSPECTUS SUPPLEMENT OR  THE ACCOMPANYING PROSPECTUS  NOR
ANY  SALE MADE HEREUNDER  SHALL, UNDER ANY  CIRCUMSTANCES, CREATE AN IMPLICATION
THAT THE INFORMATION HEREIN  IS CORRECT AS  OF ANY TIME  SUBSEQUENT TO THE  DATE
HEREOF  OR THAT THERE HAS BEEN NO CHANGE IN THE AFFAIRS OF THE SELLER SINCE SUCH
DATE.
 
                            ------------------------
 
                                     INDEX
 
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                                      Page
                                                    ---------
<S>                                                 <C>
TABLE OF CONTENTS.................................        S-6
SUMMARY INFORMATION...............................        S-8
RISK FACTORS......................................       S-33
DESCRIPTION OF THE CERTIFICATES...................       S-34
DESCRIPTION OF MORTGAGE LOANS.....................       S-71
DELINQUENCY AND FORECLOSURE
  EXPERIENCE......................................       S-80
PREPAYMENT AND YIELD CONSIDERATIONS...............       S-86
POOLING AND SERVICING AGREEMENT...................      S-102
SERVICING OF THE MORTGAGE LOANS...................      S-104
FEDERAL INCOME TAX CONSIDERATIONS.................      S-108
ERISA CONSIDERATIONS..............................      S-110
LEGAL INVESTMENT..................................      S-111
SECONDARY MARKET..................................      S-112
UNDERWRITING......................................      S-112
LEGAL MATTERS.....................................      S-112
USE OF PROCEEDS...................................      S-113
RATINGS...........................................      S-113
INDEX OF SIGNIFICANT PROSPECTUS SUPPLEMENT
  DEFINITIONS.....................................      S-114
 
                         PROSPECTUS
REPORTS...........................................          2
ADDITIONAL INFORMATION............................          2
ADDITIONAL DETAILED INFORMATION...................          2
INCORPORATION OF CERTAIN INFORMATION BY
  REFERENCE.......................................          3
TABLE OF CONTENTS.................................          4
SUMMARY OF PROSPECTUS.............................          8
RISK FACTORS......................................         13
THE TRUST ESTATES.................................         15
THE SELLER........................................         19
NORWEST MORTGAGE..................................         19
NORWEST BANK......................................         20
THE MORTGAGE LOAN PROGRAMS........................         20
DESCRIPTION OF THE CERTIFICATES...................         30
PREPAYMENT AND YIELD CONSIDERATIONS...............         39
SERVICING OF THE MORTGAGE LOANS...................         41
CERTAIN MATTERS REGARDING THE MASTER SERVICER.....         52
THE POOLING AND SERVICING AGREEMENT...............         53
CERTAIN LEGAL ASPECTS OF THE MORTGAGE LOANS.......         59
CERTAIN FEDERAL INCOME TAX CONSEQUENCES...........         66
ERISA CONSIDERATIONS..............................         93
LEGAL INVESTMENT..................................         97
PLAN OF DISTRIBUTION..............................         98
USE OF PROCEEDS...................................         99
LEGAL MATTERS.....................................         99
RATING............................................        100
INDEX OF SIGNIFICANT DEFINITIONS..................        101
</TABLE>
 
                                      [LOGO]
 
                                  $344,016,157
                                 (APPROXIMATE)
 
                                 NORWEST ASSET
                             SECURITIES CORPORATION
                                   ("NASCOR")
                                     SELLER
 
                      MORTGAGE PASS-THROUGH CERTIFICATES,
                                 SERIES 1996-4
 
                            ------------------------
 
                             PROSPECTUS SUPPLEMENT
                              -------------------
 
                          DONALDSON, LUFKIN & JENRETTE
                             SECURITIES CORPORATION
 
                                August 22, 1996
 
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                       ---------------------------------------------------------
- ---------------------------------------------------------
                       ---------------------------------------------------------


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