NORWEST ASSET SECURTIES CORP
424B5, 1996-06-11
ASSET-BACKED SECURITIES
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<PAGE>
INFORMATION  CONTAINED  HEREIN  IS  SUBJECT TO  COMPLETION  OR  AMENDMENT. THESE
SECURITIES MAY NOT BE SOLD NOR MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME A
FINAL PROSPECTUS SUPPLEMENT IS DELIVERED.  THIS PROSPECTUS SUPPLEMENT SHALL  NOT
CONSTITUTE  AN OFFER TO  SELL OR THE SOLICITATION  OF AN OFFER  TO BUY NOR SHALL
THERE BE  ANY  SALE OF  THESE  SECURITIES IN  ANY  STATE IN  WHICH  SUCH  OFFER,
SOLICITATION  OR SALE WOULD  BE UNLAWFUL PRIOR  TO REGISTRATION OR QUALIFICATION
UNDER THE SECURITIES LAWS OF ANY SUCH STATE.
<PAGE>
                   SUBJECT TO COMPLETION, DATED JUNE 10, 1996
 
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED JULY   , 1996)
 
                           $373,217,000 (APPROXIMATE)
 
                      NORWEST ASSET SECURITIES CORPORATION
                                   ("NASCOR")
 
                                     SELLER
 
               MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 1996-1
       PRINCIPAL AND INTEREST PAYABLE MONTHLY, COMMENCING IN AUGUST 1996
                             ---------------------
 
    The Series  1996-1 Mortgage  Pass-Through Certificates  (the "Series  1996-1
Certificates")  will consist of  one class of senior  certificates (the "Class A
Certificates")  and  one  class  of  subordinated  certificates  (the  "Class  B
Certificates").  The Class  A Certificates are  entitled to  a certain priority,
relative to the Class B Certificates, in right of distributions on the  Mortgage
Loans.  The  Class  A  Certificates will  consist  of  twenty-one  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-17, Class A-18,
Class A-19, Class A-R and Class A-LR Certificates. The Class B Certificates will
consist of six  subclasses of Certificates  designated as the  Class B-1,  Class
B-2,  Class B-3, Class B-4, Class B-5  and Class B-6 Certificates, none of which
is offered hereby. Each subclass of Class A Certificates or Class B Certificates
is referred to herein as a "Subclass." The Class A Certificates, other than  the
Class  A-7 Certificates, are  the only Series  1996-1 Certificates being offered
hereby and are referred to herein collectively as the "Offered 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>
                                             Initial Subclass
                                                Principal       Pass-Through      Price to     Underwriting Proceeds to
           Subclass Designation                 Balance(1)          Rate         Public(2)      Discount     Seller(3)
<S>                                          <C>               <C>             <C>             <C>          <C>
Class A-1..................................    $ 28,468,000           6.70%               %             %    $
Class A-2..................................    $ 23,379,000           7.00%               %             %    $
Class A-3..................................    $ 25,984,000           7.15%               %             %    $
Class A-4..................................    $ 20,111,000           7.30%               %             %    $
Class A-5..................................    $ 43,850,000           7.40%               %             %    $
Class A-6..................................    $ 25,738,000           7.50%               %             %    $
Class A-8..................................    $ 40,187,000           7.50%               %             %    $
Class A-9..................................    $ 26,999,800           7.50%               %             %    $
Class A-10.................................    $ 12,943,000           7.50%               %             %    $
Class A-11.................................    $ 12,444,000           7.50%               %             %    $
Class A-12.................................    $ 16,074,000           7.50%               %             %    $
Class A-13.................................    $ 11,882,000           7.50%               %             %    $
Class A-14.................................    $ 10,957,000           7.50%               %             %    $
Class A-15.................................    $ 22,008,000           7.50%               %             %    $
Class A-16.................................    $ 14,192,000           7.50%               %             %    $
Class A-17.................................    $ 22,500,000               %               %             %    $
Class A-18.................................    $    500,000         (4)                      %          %   $
Class A-19.................................  $   15,000,000          7.50    %               %          %   $
Class A-R..................................  $          100          7.50    %      (5)            N/A          (5)
Class A-LR.................................  $          100          7.50    %      (5)            N/A          (5)
    Total..................................  $  373,217,000         N/A        $               $            $
</TABLE>
 
(1) Approximate.   The  initial  Subclass  Principal  Balances  are  subject  to
    adjustment as described herein.
(2) Plus accrued interest  from July  1, 1996 to  (but not  including) July  25,
    1996.
(3) Before deducting expenses payable by the Seller estimated to be $          .
(4) The  Class A-18 Certificates are principal-only certificates and will not be
    entitled to distributions in respect of interest.
(5) The Class A-R and Class A-LR Certificates will be offered by Lehman Brothers
    Inc. from time to time in  negotiated transactions and otherwise at  varying
    prices  to be determined at the time of  sale. The Seller is not expected to
    receive proceeds with respect to the Class A-R and Class A-LR Certificates.
                          ---------------------------
    PROSPECTIVE INVESTORS  IN  THE  OFFERED  CERTIFICATES  SHOULD  CONSIDER  THE
FACTORS  DISCUSSED UNDER  "RISK FACTORS" IN  THIS PROSPECTUS  SUPPLEMENT ON PAGE
S-32 AND IN THE PROSPECTUS ON PAGE 13.
    The  Offered  Certificates  (other  than  the  Class  A-R  and  Class   A-LR
Certificates)  are offered by Lehman Brothers Inc., Bear, Stearns & Co. Inc. and
Salomon Brothers  Inc  (the  "Underwriters"),  the  Class  A-R  and  Class  A-LR
Certificates are offered by Lehman Brothers Inc. and the Class A-17 Certificates
are  also offered by Edward D. Jones & Co. (the "Dealer") subject to prior sale,
when, as and if accepted by the Underwriters and subject to certain  conditions.
It  is expected  that the  Offered Certificates  will be  available for delivery
through the facilities of The  Depository Trust Company or,  in the case of  the
Class  A-18, Class  A-R and  Class A-LR Certificates,  at the  offices of Lehman
Brothers Inc., New York, New York, in each case, on or about July 25, 1996.
                          ---------------------------
LEHMAN BROTHERS
                BEAR, STEARNS & CO. INC.
                                SALOMON BROTHERS INC
                                                                    EDWARD JONES
 
JULY   , 1996
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
    The Class A-1, Class  A-2, Class A-3, Class  A-4 and Class A-5  Certificates
are  referred to herein collectively as  the "Scheduled Certificates." The Class
A-6, Class A-7  and Class A-8  Certificates will  each be deemed  to consist  of
multiple  components. The Class  A-6 Certificates will  consist of two scheduled
components (each, a "Class  A-6 Component" and, individually,  the "Class A-6  A
Scheduled  Component" and the "Class A-6  B Scheduled Component"). The Class A-7
Certificates, which are not  offered hereby, will be  deemed to consist of  four
components  (each,  a "Class  A-7 Component"),  consisting of  two interest-only
components (the "Class A-7 IO A Component" and the "Class A-7 IO B  Component"),
an  accrual component (the  "Class A-7 Accrual  Component") and a principal-only
component (the "Class  A-7 PO Component").  The Class A-8  Certificates will  be
deemed  to  consist  of  two  components  (each  a  "Class  A-8  Component" and,
individually, the "Class A-8 A Component" and the "Class A-8 B Component"). Each
Class A-6  Component,  Class A-7  Component  and  Class A-8  Component  is  also
referred  to herein as a "Component." THE BENEFICIAL OWNER OF A CLASS A-6, CLASS
A-7 OR CLASS A-8 CERTIFICATE WILL NOT HAVE A SEVERABLE INTEREST IN ANY COMPONENT
BUT WILL HAVE AN UNDIVIDED INTEREST IN THE ENTIRE SUBCLASS.
 
    The Scheduled Certificates, the Class A-6 Components, the Class A-7  Accrual
Component,  the Class A-8 Components and the Class A-9, Class A-R and Class A-LR
Certificates are referred to  herein collectively as  the "Group I  Certificates
and Components." The Class A-10, Class A-11, Class A-12, Class A-13, Class A-14,
Class  A-15, Class A-16, Class A-17, Class  A-18 and Class A-19 Certificates are
referred to herein collectively as the "Group II Certificates."
 
    The credit  enhancement  for  the Series  1996-1  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-7 Certificates with respect  to the Class A-7 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 1996-1  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"), 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 1996-1
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 remaining
approximate  6.00% undivided interest  in the principal  balance of the Mortgage
Loans will be evidenced by the Class B 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 August  1996, to  the
holders  of Offered  Certificates, as  described herein.  The Class  A-7 Accrual
Component will accrete interest  as described herein. Holders  of the Class  A-7
Certificates  will not  be entitled  to current  distributions of  interest with
respect to the Class A-7 Accrual  Component until the Cross-Over Date.  Instead,
on  each Distribution Date prior to the  Cross-Over Date, an amount equal to the
accrued and unpaid interest on the Class A-7 Accrual Component will be added  to
the  Component Principal Balance thereof and will be distributed in reduction of
the principal balances and Component Principal Balances of certain of the  Group
I  Certificates and  Components as  described herein  under "Description  of the
Certificates -- Principal (Including Prepayments) -- Allocation of Amount to  be
Distributed."  The  amount  of  interest  accrued  on  any  Subclass  of Offered
Certificates (other than the Class A-18 Certificates) will
 
                                      S-2
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
be  reduced  by  certain  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."
The Class A-17 Certificates are entitled to  the benefit of a reserve fund  (the
"Reserve  Fund") as protection against  Non-Supported Interest Shortfalls, up to
the amount  of  the initial  deposit  into such  Reserve  Fund. The  Class  A-17
Certificates  will also be  entitled to the benefit  of an irrevocable financial
guaranty insurance  policy (the  "Policy") to  be issued  by Financial  Security
Assurance  Inc. ("Financial Security") pursuant to which Financial Security will
unconditionally and irrevocably guarantee the current payment of interest, other
than Non-Supported Interest Shortfalls that are covered by the Reserve Fund, and
the payment of any losses of principal allocated to the Class A-17 Certificates.
See "Description of the Certificates -- The Financial Guaranty Insurance Policy"
herein. Once the Reserve Fund has  been reduced to zero, Non-Supported  Interest
Shortfalls  allocated  to the  Class A-17  Certificates will  be covered  by the
Policy. See "Description of the Certificates -- Interest" herein.  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  (other than the Class A-7  Certificates) and the Class A-7 Accrual
Component in the manner described herein under "Description of the  Certificates
- -- Principal (Including Prepayments)." Distributions to each Subclass of Offered
Certificates,  other than  the Class  A-17 Certificates,  will be  made pro rata
among Certificateholders of such Subclass. On any Distribution Date on which the
Class A-17 Certificates are  entitled to receive  distributions in reduction  of
the  principal  balance  of  such  Subclass,  except  as  described  below, such
distributions  will  be  made  to  the  Beneficial  Owners  of  the  Class  A-17
Certificates  in accordance with the following  priorities: (i) any request by a
Deceased Holder, in  an amount up  to but not  exceeding an aggregate  principal
balance  of $100,000 per request and (ii) any  request by a Living Holder, in an
amount up to  but not exceeding  an aggregate principal  balance of $10,000  per
request.  Thereafter, distributions will  be made as provided  in clause (i) and
(ii) above up to a second  $100,000 and $10,000, respectively. This sequence  of
priorities will be repeated for each request for principal distributions made by
the  Certificateholders  of  such Subclass  until  all such  requests  have been
honored. After all such requests have  been honored, distributions will be  made
to  Beneficial Owners of the  Subclass selected by random  lot, to the extent of
any remaining funds. In  each case, distributions of  principal will be made  in
lots  of $1,000. On each Distribution Date following the first Distribution Date
on which any principal losses are  allocated to the Class A  Certificateholders,
principal  distributions on  the Class A-17  Certificates will be  made pro rata
among the  holders of  the  Class A-17  Certificates.  See "Description  of  the
Certificates  -- Distributions  in Reduction of  the Class  A Subclass Principal
Balance of the Class A-17 Certificates" herein.
 
    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 Subclasses 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, in particular,
      the Class  A-17 Certificates  would 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  (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,
PARTICULARLY  THE  CLASS  A-18  CERTIFICATES,  THE  RISK  THAT  A  SLOWER   THAN
ANTICIPATED    RATE   OF   PAYMENTS   IN   RESPECT   OF   PRINCIPAL   (INCLUDING
 
                                      S-3
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
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.  SEE
"DESCRIPTION   OF  THE  CERTIFICATES  --  INTEREST,"  "--  PRINCIPAL  (INCLUDING
PREPAYMENTS)" AND  "PREPAYMENT  AND  YIELD CONSIDERATIONS"  HEREIN  AND  IN  THE
PROSPECTUS.
 
    THE WEIGHTED AVERAGE LIFE OF THE CLASS A-8 CERTIFICATES WILL BE PARTICULARLY
SENSITIVE  TO THE RATE OF PREPAYMENTS ON THE MORTGAGE LOANS. SEE "DESCRIPTION OF
THE CERTIFICATES -- PRINCIPAL (INCLUDING PREPAYMENTS) -- ALLOCATION OF AMOUNT TO
BE DISTRIBUTED" AND "PREPAYMENT AND YIELD CONSIDERATIONS" HEREIN.
 
    The Offered Certificates,  other than the  Class A-18, Class  A-R and  Class
A-LR  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  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  Underwriters and, with  respect to the Class  A-17 Certificates, the Dealer
intend to  act  as  market  makers  in  the  Offered  Certificates,  subject  to
applicable  provisions of federal and state securities laws and other regulatory
requirements, but are 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 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 and Class A-LR 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 and Class A-6 Certificates, the Class A-7 Accrual Component,  the
Class  A-7  IO A  Component, the  Class A-7  IO  B Component,  the Class  A-7 PO
Component, the 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-17, Class A-18 and Class A-19
Certificates and the Class B-1, Class B-2,  Class B-3, Class B-4, Class B-5  and
Class  B-6 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-7 Certificates)  represent
twenty  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  July
  ,
 
                                      S-4
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
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.
 
    IN CONNECTION WITH THIS OFFERING, THE UNDERWRITERS MAY OVER-ALLOT OR  EFFECT
TRANSACTIONS  WHICH  STABILIZE  OR MAINTAIN  THE  MARKET PRICES  OF  THE OFFERED
CERTIFICATES (OTHER THAN THE  CLASS A-R AND CLASS  A-LR CERTIFICATES) AT  LEVELS
ABOVE  THOSE WHICH MIGHT OTHERWISE PREVAIL IN THE OPEN MARKET. SUCH STABILIZING,
IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                            ------------------------
 
    UNTIL OCTOBER    , 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-32
  General................................................................................................       S-32
  Distribution in Reduction of the Class A Subclass Principal Balance of the Class A-17 Certificates.....       S-32
  Book-Entry System for Certain Classes and Subclasses of Certificates...................................       S-32
Description of the Certificates..........................................................................       S-33
  Denominations..........................................................................................       S-33
  Definitive Form........................................................................................       S-33
  Book-Entry Form........................................................................................       S-33
  Distributions..........................................................................................       S-33
  Interest...............................................................................................       S-36
  Principal (Including Prepayments)......................................................................       S-44
    Calculation of Amount to be Distributed to the Class A Certificates..................................       S-44
    Calculation of Amount to be Distributed to the Class A-7 PO Component................................       S-47
    Allocation of Amount to be Distributed...............................................................       S-48
  Distribution in Reduction of the Class A Subclass Principal Balance of the Class A-17 Certificates.....       S-59
    General..............................................................................................       S-59
    Priority of Requested Distributions..................................................................       S-60
    Procedure for Requested Distributions................................................................       S-60
    Mandatory Distributions of Principal on Class A-17 Certificates......................................       S-61
  Additional Rights of the Class A-R and Class A-LR Certificateholders...................................       S-62
  Periodic Advances......................................................................................       S-62
  The Financial Guaranty Insurance Policy................................................................       S-62
  Financial Security Assurance Inc.......................................................................       S-64
  Restrictions on Transfer of the Class A-R and Class A-LR Certificates..................................       S-66
  Reports................................................................................................       S-67
  Subordination of Class B Certificates..................................................................       S-67
    Allocation of Losses.................................................................................       S-68
Description of the Mortgage Loans........................................................................       S-72
  General................................................................................................       S-72
  Mortgage Loan Data.....................................................................................       S-75
  Mandatory Repurchase or Substitution of Mortgage Loans.................................................       S-81
  Optional Repurchase of Defaulted Mortgage Loans........................................................       S-82
Delinquency and Foreclosure Experience...................................................................       S-82
Prepayment and Yield Considerations......................................................................       S-88
  Sensitivity of the Class A-18 Certificates.............................................................      S-100
Pooling and Servicing Agreement..........................................................................      S-101
  General................................................................................................      S-101
  Distributions..........................................................................................      S-101
  Voting.................................................................................................      S-101
  Trustee................................................................................................      S-102
  Trust Administrator....................................................................................      S-102
  Master Servicer........................................................................................      S-102
  Special Servicing Agreements...........................................................................      S-102
  Optional Termination...................................................................................      S-103
</TABLE>
 
                                      S-6
<PAGE>
<TABLE>
<CAPTION>
                                                                                                             PAGE
                                                                                                           ---------
<S>                                                                                                        <C>
Servicing of the Mortgage Loans..........................................................................      S-103
  The Servicers..........................................................................................      S-103
  Servicer Custodial Accounts............................................................................      S-104
  Unscheduled Principal Receipts.........................................................................      S-104
  Anticipated Changes in Servicing.......................................................................      S-105
  Servicing Compensation and Payment of Expenses.........................................................      S-106
  Servicer Defaults......................................................................................      S-106
Federal Income Tax Considerations........................................................................      S-106
  Regular Certificates...................................................................................      S-107
  Residual Certificates..................................................................................      S-107
ERISA Considerations.....................................................................................      S-109
Legal Investment.........................................................................................      S-110
Secondary Market.........................................................................................      S-110
Underwriting.............................................................................................      S-111
Legal Matters............................................................................................      S-112
Experts..................................................................................................      S-112
Use of Proceeds..........................................................................................      S-112
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    1996-1
                                  Certificates  (the  "Series  1996-1  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  from  The   Prudential  Home  Mortgage
                                  Company, Inc.  ("PHMC") or  various other  entities  (each
                                  other  such  entity, a  "Norwest  Mortage 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.........................  Firstar Trust  Company,  a banking  corporation  organized
                                  under  the laws of Wisconsin (the "Trustee"). See "Pooling
                                  and Serviceing Agreement  -- Trustee"  in this  Prospectus
                                  Supplement.
Trust Administrator.............  First   Bank  National  Association,  a  national  banking
                                  association  (the   "Trust  Administrator").   The   Trust
                                  Administrator    will   perform   certain   administrative
                                  functions on behalf  of the  Trustee and will  act as  the
                                  initial paying agent, certificate registrar and custodian.
                                  The Trust Administrator 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  --  Trust  Administrator"  in  this  Prospectus
                                  Supplement.
Rating of Certificates..........  It   is  a  condition  to  the  issuance  of  the  Offered
                                  Certificates that  they shall  have  been rated  "AAA"  by
                                  Fitch Investors Service, L.P. ("Fitch"). It is a condition
                                  to  the issuance  of the Offered  Certificates, other than
                                  the Class  A-18 Certificates,  that they  shall have  been
                                  rated "AAA" by Standard and Poor's ("S&P"). It is a condi-
                                  tion  to the issuance of  the Class A-18 Certificates that
                                  they shall have been rated "AAAr" by S&P. S&P assigns  the
                                  additional   rating  of   "r"  to   highlight  classes  of
                                  securities  that   S&P   believes  may   experience   high
                                  volatility  or high variability in expected returns due to
                                  non-credit  risks.  The  ratings  of  Fitch  on   mortgage
                                  pass-through  certificates 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 "Rat-
                                  ings" in this Prospectus Supplement.
</TABLE>
 
                                      S-9
<PAGE>
 
<TABLE>
<S>                               <C>
Description of Certificates.....  The Series 1996-1 Certificates will consist of the Class A
                                  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  B
                                  Certificates  represent a type of  interest referred to in
                                  the Prospectus  as "Subordinated  Certificates." As  these
                                  designations   suggest,  the  Class   A  Certificates  are
                                  entitled to a  certain priority, relative  to the Class  B
                                  Certificates,  in right  of distributions  on the mortgage
                                  loans  underlying  the  Series  1996-1  Certificates  (the
                                  "Mortgage  Loans"). See "-- Distributions of Principal and
                                  Interest" below.
                                  The  Class  A  Certificates  will  consist  of  twenty-one
                                  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-17,
                                  Class   A-18,  Class  A-19,  Class   A-R  and  Class  A-LR
                                  Certificates. The Class B Certificates will consist of six
                                  Subclasses, designated as the Class B-1, Class B-2,  Class
                                  B-3,  Class B-4, Class B-5 and Class B-6 Certificates. The
                                  Class  A   Certificates   (other  than   the   Class   A-7
                                  Certificates),   are  referred   to  in   this  Prospectus
                                  Supplement as the  "Offered Certificates."  The Class  A-7
                                  Certificates  and the Class B 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 Certificates as
                                  of  the date of issuance of the Series 1996-1 Certificates
                                  and the approximate initial aggregate principal balance of
                                  such  Subclasses  as  of  the  date  of  this   Prospectus
                                  Supplement  will not  exceed 5%  of the  initial aggregate
                                  principal balance of the Offered Certificates as stated on
                                  the cover of this Prospectus Supplement plus the  expected
                                  initial  principal balance of  the Class A-7 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  Class A  Certificates will initially  evidence in the
                                  aggregate an approximate 94.00% undivided interest in  the
                                  principal  balance  of the  Mortgage Loans.  The remaining
                                  approximate 6.00%  undivided  interest  in  the  principal
                                  balance  of the  Mortgage Loans  will be  evidenced by the
                                  Class B Certificates.  The Class  A-7 Certificates,  which
                                  are  not offered hereby, consist in  part of the Class A-7
                                  PO  Component  (as  defined  below).  The  Class  A-7   PO
                                  Component  will evidence  an interest  in portions  of the
                                  principal balances of Mortgage  Loans that have Net  Mort-
                                  gage  Interest Rates, as  defined on page  S-40, less than
                                  7.50%  (the  "Discount  Mortgage  Loans"),  such   initial
                                  interest  in  the  aggregate  representing  an approximate
                                  1.50% interest by principal balance of the Mortgage  Loans
                                  (the "Pool Balance (PO Portion)") and an approximate 4.10%
                                  initial  interest in the principal balance of the Discount
                                  Mortgage Loans.  By virtue  of  the subordination  of  the
                                  Class B Certificates, it is possible that the Class A-7 PO
                                  Component   may   also   receive   support   from  certain
</TABLE>
 
                                      S-10
<PAGE>
 
<TABLE>
<S>                               <C>
                                  payments made with respect to the other Mortgage Loans  in
                                  the Trust Estate. The Class A Certificates (other than the
                                  Class  A-7 PO Component) 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)"). Initially,  the  Class A  Certificates  (other
                                  than  the  Class A-7  PO Component)  will evidence  in the
                                  aggregate   an   approximate   93.91   %    (approximately
                                  $513,236,000)  undivided interest in the initial Pool Bal-
                                  ance (Non-PO Portion)  and the Class  B Certificates  will
                                  evidence   in   the   aggregate   an   approximate   6.09%
                                  (approximately  $33,291,970)  undivided  interest  in  the
                                  initial   Pool  Balance  (Non-PO  Portion).  The  relative
                                  interests in  the initial  Pool Balance  (Non-PO  Portion)
                                  represented  by the  Class A Certificates  (other than the
                                  Class A-7 PO Component) 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-7 PO Component) for a specified period and the
                                  allocation of certain losses and certain shortfalls to the
                                  Class  B Certificates in reverse numerical order, prior to
                                  the allocation of such losses and shortfalls to the  Class
                                  A Certificates (other than the Class A-7 PO Component), as
                                  discussed  in "-- Distributions of Principal and Interest"
                                  and "-- Credit Enhancement" below.
                                  Solely  for  purposes  of  determining  distributions   in
                                  reduction  of principal  balance, the Class  A-6 and Class
                                  A-8 Certificates will  each be  deemed to  consist of  two
                                  components.  The components of  the Class A-6 Certificates
                                  are referred  to  herein as  the  "Class A-6  A  Scheduled
                                  Component"  and the "Class A-6 B Scheduled Component" and,
                                  collectively,  as   the   "Class  A-6   Components."   The
                                  components  of the Class A-8  Certificates are referred to
                                  herein as the "Class A-8 A Component" and the "Class A-8 B
                                  Component"  and,   collectively,   as   the   "Class   A-8
                                  Components."
                                  The  Class A-7 Certificates, which are not offered hereby,
                                  will be deemed to consist  of four components (the  "Class
                                  A-7   Components"),   consisting   of   two  interest-only
                                  components (the "Class A-7 IO A Component" and the  "Class
                                  A-7 IO B Component"), an accrual component (the "Class A-7
                                  Accrual  Component") and  a principal-only  component (the
                                  "Class A-7  PO Component").  Each of  the Class  A-7 IO  A
                                  Component   and  the  Class  A-7  IO  B  Component  is  an
                                  interest-only component  and  has no  component  principal
                                  balance.  Unless  the aggregate  principal balance  of the
                                  Class  B  Certificates  has  been  reduced  to  zero,  the
                                  interest  that accrues on  the component principal balance
                                  of the Class A-7 Accrual  Component will not be paid  cur-
                                  rently  as  interest  to  the  holders  of  the  Class A-7
                                  Certificates on any Distribution  Date but, instead,  such
                                  amounts  will be added to  the component principal balance
                                  of such component. On  each Distribution Date, unless  the
                                  aggregate  principal balance  of the  Class B Certificates
                                  has been reduced to zero,  an amount equal to the  accrued
                                  and   unpaid   interest   on   the   Class   A-7   Accrual
</TABLE>
 
                                      S-11
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Component  will  be  distributed   in  reduction  of   the
                                  principal  balances  and component  principal  balances of
                                  certain of  the Group  I Certificates  and Components,  as
                                  described   under   the   heading   "Description   of  the
                                  Certificates  --  Principal  (Including  Prepayments)   --
                                  Allocation of Amount to be Distributed" in this Prospectus
                                  Supplement.
</TABLE>
 
- --------------------------------------------------------------------------------
 
                COMPONENT PRINCIPAL BALANCES AND COMPONENT RATES
 
<TABLE>
<CAPTION>
                                                                          APPROXIMATE
                                                                  INITIAL COMPONENT PRINCIPAL         COMPONENT
                          COMPONENT                                         BALANCE                     RATE
- -------------------------------------------------------------  ---------------------------------  -----------------
<S>                                                            <C>                                <C>
Class A-6 A Component........................................          $       2,500,000                 (1)
Class A-6 B Component........................................          $      23,238,000                 (1)
Class A-7 Accrual Component..................................          $     140,019,000                  7.50%
Class A-7 PO Component.......................................          $       8,323,682                 (2)
Class A-7 IO A Component.....................................                 (3)                         7.50%
Class A-7 IO B Component.....................................                 (4)                      (5)
Class A-8 A Component........................................  $                20,094,000             (1)
Class A-8 B Component........................................  $                20,093,000             (1)
</TABLE>
 
- ------------------------------
(1)  The  Class A-6 and  Class A-8 Certificates  accrue interest at  the rate of
     7.50% per annum on the sum of the component prinicpal balances of the Class
     A-6 and Class A-8 Certificates, respectively.
 
(2)  The Class  A-7 PO  Component is  a principal-only  component and  will  not
     accrue interest on its component principal balance.
 
(3)  The  Class  A-7  IO  A  Component is  an  interest-only  component,  has no
     principal balance and will  bear interest on the  Class A-7 IO A  Component
     Notional Amount (as defined herein) (initially approximately $6,928,733).
 
(4)  The  Class  A-7  IO  B  Component is  an  interest-only  component,  has no
     principal balance and will  bear interest on the  Class A-7 IO B  Component
     Notional Amount (as defined herein) (initially approximately $351,638,280).
 
(5)  Interest  will accrue on  the Class A-7  IO B Component  as described under
     "Description  of  the   Certificates  --  Interest"   in  this   Prospectus
     Supplement.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                               <C>
                                  The  principal balances  of the  Class A-6,  Class A-7 and
                                  Class A-8  Certificates will  equal the  sum of  component
                                  principal  balances  of their  respective  components. The
                                  holder of a Class A-6, Class A-7 or Class A-8  Certificate
                                  will  not have a  severable interest in  any component but
                                  will have an undivided interest in the entire Subclass.
                                  The Class A-1, Class A-2,  Class A-3, Class A-4 and  Class
                                  A-5  Certificates are  referred to  herein collectively as
                                  the "Scheduled Certificates." The Scheduled  Certificates,
                                  the Class A-6 Components, the Class A-7 Accrual Component,
                                  the  Class A-8 Components and the Class A-9, Class A-R and
                                  Class   A-LR   Certificates   are   referred   to   herein
                                  collectively as the "Group I Certificates and Components."
                                  The  Class A-10, Class A-11, Class A-12, Class A-13, Class
                                  A-14, Class A-15, Class A-16,  Class A-17, Class A-18  and
                                  Class   A-19   Certificates   are   referred   to   herein
                                  collectively as the "Group II Certificates."
                                  The Class A-17 Certificates are entitled to the benefit of
                                  a reserve fund (the "Reserve Fund") as protection  against
                                  Non-Supported  Interest Shortfalls up to the amount of the
                                  initial
</TABLE>
 
                                      S-12
<PAGE>
 
<TABLE>
<S>                               <C>
                                  deposit into such  reserve fund. See  "Description of  the
                                  Certificates  -- Interest" in  this Prospectus Supplement.
                                  The Class A-17 Certificates will  also be entitled to  the
                                  benefit  of  an irrevocable  financial  guaranty insurance
                                  policy (the "Policy") to  be issued by Financial  Security
                                  Assurance  Inc. ("Financial Security"),  pursuant to which
                                  Financial Security  will unconditionally  and  irrevocably
                                  guarantee  the  current  payment of  interest,  other than
                                  Non-Supported Interest Shortfalls that are covered by  the
                                  Reserve  Fund, and the payment  of any losses of principal
                                  allocated to the Class A-17 Certificates. Once the Reserve
                                  Fund has been reduced to zero, the Policy will also  cover
                                  any  Non-Supported  Interest Shortfalls  allocated  to the
                                  Class  A-17   Certificates.   See  "Description   of   the
                                  Certificates  -- The Financial  Guaranty Insurance Policy"
                                  in this Prospectus Supplement.
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>
 
- --------------------------------------------------------------------------------
 
                 FORM AND DENOMINATIONS OF OFFERED CERTIFICATES
 
<TABLE>
<CAPTION>
                                                             ORIGINAL CERTIFICATE       MINIMUM      INCREMENTAL
                         SUBCLASS                                    FORM            DENOMINATION   DENOMINATION
- ----------------------------------------------------------  -----------------------  -------------  -------------
<S>                                                         <C>                      <C>            <C>
Classes A-1, A-2, A-3, A-4, A-5, A-9*, A-10, A-11, A-12,
 A-13, A-14, A-15 and A-16................................  Book-Entry                $    25,000     $   1,000
Classes A-6, A-8 and A-19.................................  Book-Entry                $   100,000     $   1,000
Class A-17................................................  Book-Entry                $     1,000     $   1,000
Class A-18................................................  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 the  Class A-9
     Certificates, one  of the  Class A-9  Certificates will  be issued  in  any
     denomination in excess of $25,000 initial principal balance.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                 <C>
 
                                    BOOK-ENTRY  FORM. The  Offered Certificates,  other than
                                    the Class A-18, Class  A-R and Class A-LR  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
 
</TABLE>
                                      S-13
 
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    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-18,  Class A-R  and Class
                                    A-LR 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  1996-1
                                    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>
 
- --------------------------------------------------------------------------------
 
SELECTED MORTGAGE LOAN DATA(1)
(AS OF THE CUT-OFF DATE)
 
<TABLE>
<S>                                                               <C>
Cut-Off Date:                                                     July 1, 1996
Number of Mortgage Loans:                                         2,042
Aggregate Unpaid Principal Balance(2):                            $554,851,652
Range of Unpaid Principal Balances(2):                            $19,957 to $1,951,167
Average Unpaid Principal Balance(2):                              $271,720
Range of Mortgage Interest Rates:                                 6.250% to 9.750%
Weighted Average Mortgage Interest Rate(2):                       8.008%
Range of Remaining Terms to Stated Maturity:                      227 months to 360 months
Weighted Average Remaining Term to Stated Maturity(2):            356 months
Range of Original Loan-to-Value Ratios(2):                        9.17% to 95.00%
Weighted Average Original Loan-to-Value Ratio(2):                 75.94%
Geographic Concentration of Mortgaged Properties
 Securing Mortgage Loans in Excess of 5% of the
 Aggregate Unpaid Principal Balance(2):                           California         35.93%
                                                                  New York          9.58%
                                                                  New Jersey        7.52%
Maximum Five-Digit Zip Code Concentration(1):                     0.97%
</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
 
</TABLE>
                                      S-14
<PAGE>
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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 1996-1
                                  Certificates (which is expected to occur on or about  July
                                  25, 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 issuance of  the Series  1996-1 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   1996-1
                                  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  1996-1
                                  Certificates.  See  "Pooling  and  Servicing  Agreement --
                                  Optional Termination" in this Prospectus Supplement.
Underwriting Standards..........  Approximately 97.14% (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
</TABLE>
 
                                      S-15
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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. Approximately 0.04% and 0.89% (by Cut-Off
                                  Date Aggregate Principal  Balance) of  the Mortgage  Loans
                                  were  reviewed  by  General  Electric  Mortgage  Insurance
                                  Corporation ("GEMICO")  and  United  Guaranty  Residential
                                  Insurance   Company  ("UGRIC"),  respectively,  to  ensure
                                  compliance with  their  respective credit,  appraisal  and
                                  underwriting    standards    (the    "Pool   Certification
                                  Underwritten   Loans").   Neither   the   Series    1996-1
                                  Certificates   nor  the  Mortgage  Loans  are  insured  or
                                  guaranteed under a mortgage  pool insurance policy  issued
                                  by  GEMICO or  UGRIC. The  Pool Certification Underwritten
                                  Loans were evaluated using credit scoring as described  in
                                  the  Prospectus  under  "The  Mortgage  Loan  Programs  --
                                  Mortgage   Loan   Underwriting   --   Pool   Certification
                                  Underwriting"  and,  based on  the  credit scores  of such
                                  Mortgage Loans,  some  of  such Mortgage  Loans  were  re-
                                  underwritten.  The remaining approximate 1.93% (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
                                  1996-1  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  "Distribution  Date"),
                                  commencing  in August  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 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-7  PO  Component Deferred
                                  Amount, as defined on page S-47) before any  distributions
                                  are made to holders of the
</TABLE>
 
                                      S-16
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Class  B Certificates on that Distribution Date. The Class
                                  A-7 Certificates, with respect to Class A-7 PO  Component,
                                  will  be entitled  to receive  the Class  A-7 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 balance  of  the  Class  A-7  Certificates  with
                                  respect  to  the  Class  A-7  Accrual  Component)  and the
                                  amounts required  to be  paid as  a premium  to  Financial
                                  Security   and   then,   if  the   amount   available  for
                                  distribution exceeds the amount of interest due holders of
                                  the Class A Certificates and  any such premium, to  reduce
                                  the   outstanding  principal  balances   of  the  Class  A
                                  Certificates.   As    described   under    "--    Interest
                                  Distributions"   below,  unless  the  aggregate  principal
                                  balance of the  Class B Certificates  has been reduced  to
                                  zero,  an amount equal to the amount accrued in respect of
                                  interest on the Class A-7 Certificates with respect to the
                                  Class A-7  Accrual  Component  will be  distributed  as  a
                                  reduction   of  the   principal  balances   and  component
                                  principal balances of certain of the Group I  Certificates
                                  and  Components as 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-7 Certificates with
                                  respect to the Class A-7 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  and, in  the
                                  case  of  the Class  A-17 Certificates,  on the  number of
                                  requests for distribution of  principal made on behalf  of
                                  deceased  owners  with respect  to  such Subclass,  on the
                                  number of requests for distributions of principal made  by
                                  living  owners with  respect to  such Subclass  and on the
                                  random lot selection for distributions in reduction of the
                                  principal balance of such Subclass.
                                  After all amounts due on  the Class A Certificates  (other
                                  than the Class A-7 PO Component Deferred Amount), together
                                  with  the premium payment due  to Financial Security, have
                                  been paid, the  amount remaining will  be distributed,  in
                                  the following order, to (i) pay any Class A-7 PO Component
                                  Deferred Amount first 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-6
                                  Certificates, then from amounts otherwise distributable as
                                  principal on the  Class B-5 Certificates,  and so on)  and
                                  (ii)  pay  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
</TABLE>
 
                                      S-17
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Subclasses  of Class B  Certificates with higher numerical
                                  designations receive any payments  in respect of  interest
                                  or  principal, provided  that the  principal due  any such
                                  Subclass will be  reduced by  any amount used  to pay  the
                                  Class  A-7 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  Trust
                                  Administrator 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 of  Offered Certificates, other
                                  than the Class  A-18 Certificates, will  be entitled  each
                                  month  is  calculated based  on the  outstanding principal
                                  balance of such Subclass,  as of the related  Distribution
                                  Date.  Interest  will  accrue  each  month  on  each  such
                                  Subclass according to the following formula: 1/12th of the
                                  Pass-Through Rate  for  such Subclass  multiplied  by  the
                                  outstanding  principal balance of such  Subclass as of the
                                  related Distribution  Date.  Holders  of  the  Class  A-18
                                  Certificates will not be entitled to receive distributions
                                  of  interest. The "Pass-Through Rate" for each Subclass of
                                  Offered Certificates is  the percentage set  forth on  the
                                  cover of this Prospectus Supplement.
                                  Interest  will accrue  on the Class  A-7 Certificates each
                                  month in  an  amount equal  to  the sum  of  the  interest
                                  accrued  on the Class A-7 Accrual Component, the Class A-7
                                  IO A Component and the Class A-7 IO B Component.  Interest
                                  will accrue on the Class A-7 Accrual Component at the rate
                                  of  1/12th of the Component Rate for such component on the
                                  outstanding component principal balance of such component.
                                  Interest will accrue on  the Class A-7  IO A Component  at
                                  the  rate  of  1/12th  of  the  Component  Rate  for  such
                                  component on the Class A-7 IO A Component Notional  Amount
                                  for such component. The "Class A-7 IO A Component Notional
                                  Amount"  for the Class  A-7 IO A Component  on any date is
                                  equal to the product of (i)  (a) the excess of 7.50%  over
                                  the  weighted  average of  the  Pass-Through Rates  of the
                                  Class A-1, Class A-2, Class  A-3, Class A-4 and Class  A-5
                                  Certificates  divided by (b) 7.50% and (ii) the sum of the
                                  principal balances of the Class A-1, Class A-2, Class A-3,
                                  Class A-4 and Class A-5 Certificates. Interest will accrue
                                  on the Class A-7 IO B Component as described on page  S-37
                                  herein.
                                  Holders  of each Subclass of  Certificates (other than the
                                  Class A-18  Certificates)  will  be  entitled  to  receive
                                  distributions  of  interest  on  each  Distribution  Date.
                                  Holders of  the Class  A-7 Certificates  (i) will  not  be
                                  entitled to receive distributions of
</TABLE>
 
                                      S-18
<PAGE>
 
<TABLE>
<S>                               <C>
                                  interest  with respect to  the Class A-7  PO Component and
                                  (ii) will  not be  entitled  to receive  distributions  of
                                  interest  with respect to the  Class A-7 Accrual Component
                                  until the  aggregate  principal  balance of  the  Class  B
                                  Certificates has been reduced to zero. See "Description of
                                  the   Certificates   --  Interest"   in   this  Prospectus
                                  Supplement. Until the aggregate  principal balance of  the
                                  Class  B Certificates has been reduced to zero, the amount
                                  of  interest  to  which  the  holders  of  the  Class  A-7
                                  Certificates   with  respect  to  the  Class  A-7  Accrual
                                  Component are entitled will not be distributed as interest
                                  to such holders but instead will be added to the component
                                  principal balance of the  Class A-7 Accrual Component.  An
                                  amount  equal to the  amount of interest  that has accrued
                                  but is  not  currently  distributable  on  the  Class  A-7
                                  Certificates   with  respect  to  the  Class  A-7  Accrual
                                  Component will instead be distributed in reduction of  the
                                  principal  balances  and component  principal  balances of
                                  certain of  the Group  I  Certificates and  Components  as
                                  described   under   the   heading   "Description   of  the
                                  Certificates  --  Principal  (Including  Prepayments)   --
                                  Allocation of Amount to be Distributed" in this Prospectus
                                  Supplement.
                                  On  each  Distribution  Date, Financial  Security  will be
                                  entitled to receive,  as payment  of the  premium for  the
                                  financial  guaranty insurance  policy, an  amount equal to
                                  (A) the  product  of (i)  1/12th  of 0.08%  and  (ii)  the
                                  outstanding   principal   balances  of   the   Class  A-17
                                  Certificates, less  (B) a  pro rata  portion of  the  Non-
                                  Supported    Interest   Shortfalls    and   other   losses
                                  attributable to  interest  allocable  to  such  amount  as
                                  described below for each such Distribution Date.
                                  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 between  the Classes  of  the
                                  Series 1996-1 Certificates based on their then-outstanding
                                  principal balances (after subtracting, with respect to the
                                  Class  A Certificates, the  component principal balance of
                                  the  Class  A-7  PO   Component).  The  amount   allocated
</TABLE>
 
                                      S-19
<PAGE>
 
<TABLE>
<S>                               <C>
                                  to  the Class  A Certificates  will be  allocated pro rata
                                  among the Subclasses of Class A Certificates and Financial
                                  Security, based on  interest accrued  in the  case of  the
                                  Subclasses of Class A Certificates and the premium payment
                                  described  above in  the case  of Financial  Security. The
                                  Policy will  not cover  Non-Supported Interest  Shortfalls
                                  allocated  to the Class A-17 Certificates that are covered
                                  by the  Reserve  Fund.  Once the  Reserve  Fund  has  been
                                  reduced   to   zero,  Non-Supported   Interest  Shortfalls
                                  allocated to the Class  A-17 Certificates will be  covered
                                  by  the Policy.  See "Description  of the  Certificates --
                                  Interest" herein.
                                  Interest  shortfalls  resulting  from  partial   principal
                                  prepayments  will not  be covered by  the Master Servicer,
                                  but  instead  will   be  borne  first   by  the  Class   B
                                  Certificates   and  then,   pro  rata   by  the   Class  A
                                  Certificates and the premium  otherwise payable to  Finan-
                                  cial  Security.  See "Description  of the  Certificates --
                                  Subordination  of  the  Class  B  Certificates"  in   this
                                  Prospectus Supplement.
                                  In order to provide protection to the holders of the Class
                                  A-17    Certificates   against    Non-Supported   Interest
                                  Shortfalls, the Reserve Fund  will be established for  the
                                  Class  A-17 Certificates at  the time of  issuance of such
                                  Certificates. At such time,  approximately $      will  be
                                  deposited  into  the Reserve  Fund. No  additional amounts
                                  will be deposited into the Reserve Fund after the  initial
                                  deposit.   If  any  Non-Supported  Interest  Shortfall  is
                                  allocated to the  Class A-17 Certificates,  the amount  of
                                  such   shortfall,  to  the   extent  funds  are  available
                                  therefor, will  be withdrawn  from  the Reserve  Fund  and
                                  distributed  to the holders of the Class A-17 Certificates
                                  on such  Distribution  Date.  The  Reserve  Fund  will  be
                                  beneficially   owned  by  Lehman  Brothers  Inc.  ("Lehman
                                  Brothers") and will not be an asset of the Trust Estate or
                                  the Upper-Tier  or Lower-Tier  REMIC. The  balance of  any
                                  amount  remaining in the Reserve  Fund on the Distribution
                                  Date on which the principal  balance of each of the  Class
                                  A-17  Certificates is reduced to  zero will be distributed
                                  to Lehman Brothers.
                                  In  addition,  the  amount  of  interest  required  to  be
                                  distributed  to holders of  the Series 1996-1 Certificates
                                  and the premium payment required  to be paid to  Financial
                                  Security  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 component principal balance of the Class A-7
                                  Accrual  Component)  and  to  make  the  required  premium
                                  payment  to Financial  Security (net  of any Non-Supported
                                  Interest Shortfall, other shortfalls and losses  allocable
                                  to  the Class  A Certificates  and the  premium payment as
                                  described above), the amount of interest to be distributed
                                  will
</TABLE>
 
                                      S-20
<PAGE>
 
<TABLE>
<S>                               <C>
                                  be allocated among the  outstanding Subclasses of Class  A
                                  Certificates  and the premium payment  required to be paid
                                  to Financial Security  pro rata in  accordance with  their
                                  respective  entitlements to interest and the amount of the
                                  premium payment.  The amount  of  any deficiency  will  be
                                  added  to the amount of  interest and premium payment that
                                  the  Class   A   Certificates  and   Financial   Security,
                                  respectively,   are  entitled  to  receive  on  subsequent
                                  Distribution  Dates.  No  interest  will  accrue  on  such
                                  deficiencies.  The Policy will cover any such deficiencies
                                  allocated to the Class-17 Certificates.
                                  Interest on the Class A 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-7 Certificates with
                                  respect  to the Class A-7  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 lesser of
                                  (a) 1.0 and (b)  the Net Mortgage  Interest Rate for  such
                                  Mortgage  Loan divided  by 7.50%.  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-7 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 Class B Certificates. As a result,  the
                                  percentage   of  certain  unscheduled  principal  payments
                                  otherwise distributable  to the  holders  of the  Class  B
                                  Certificates  that is instead distributable to the holders
                                  of the Class A Certificates  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 it is equal to zero. On each Distribution Date,
                                  the  Class B Certificates will collectively 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
</TABLE>
 
                                      S-21
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Fraction of such  Mortgage Loan  equal, in  each case,  to
                                  100%  less  the  applicable  percentage  for  the  Class A
                                  Certificates described above.
                                  The aggregate amount of principal to which holders of  the
                                  Class  A-7  Certificates  are  entitled  each  month  with
                                  respect to the Class A-7  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.  In addition,  the Class  A-7 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-7  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-7 Certificates  will also be
                                  entitled each month to an amount equal to the Class A-7 PO
                                  Component Deferred  Amount.  The Class  A-7  PO  Component
                                  Deferred  Amount will be paid to  holders of the Class A-7
                                  Certificates only from amounts otherwise distributable  as
                                  principal  to the  Subclasses of Class  B Certificates. No
                                  interest  will  accrue  on  any  Class  A-7  PO  Component
                                  Deferred Amount.
                                  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-7 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 component  principal balance  of the
                                  Class A-7 Accrual Component)  and the premium required  to
                                  be  paid  to  Financial  Security  from  the  total amount
                                  collected that is available  to be distributed to  holders
                                  of  the  Series 1996-1  Certificates on  such Distribution
                                  Date and (ii) the amount of interest, if any, added to the
                                  component principal  balance  of  the  Class  A-7  Accrual
                                  Component   with  respect   to  such   Distribution  Date.
                                  Accordingly, even though the Class A Certificates may  not
                                  receive  all accrued  interest and  Financial Security may
                                  not receive the entire premium  payment to which they  are
                                  entitled  on  a given  Distribution  Date, certain  of the
                                  Group  I   Certificates   and   Components   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"
                                  and "-- Distributions in Reduction of the Class A Subclass
                                  Principal  Balance of the Class A-17 Certificates" in this
                                  Prospectus Supplement.
</TABLE>
 
                                      S-22
<PAGE>
 
<TABLE>
<S>                               <C>
Distributions of Principal with
 Respect to the Class A-17
 Certificates...................  The receipt  by  any  beneficial owner  of  a  Class  A-17
                                  Certificate  of  distributions in  reduction  of principal
                                  balance  is  not  only  dependent  upon  such   Subclass's
                                  entitlement to receive principal payments relative to that
                                  of  other  Subclasses, and  upon  the rate  and  timing of
                                  principal payments  (including  prepayments) made  on  the
                                  Mortgage  Loans,  but also  upon  a special  procedure for
                                  allocation of principal distributions  to which the  Class
                                  A-17 Certificates are subject.
                                  Authorized representatives of Deceased Holders (as defined
                                  on  page S-59 of this  Prospectus Supplement) of the Class
                                  A-17 Certificates and Living  Holders (as defined on  page
                                  S-59  of  this Prospectus  Supplement)  of the  Class A-17
                                  Certificates have the  right to  request distributions  of
                                  principal  on  their Certificates,  in minimum  amounts of
                                  $1,000 and integral multiples  thereof. Such requests  for
                                  distribution of principal will be honored, with respect to
                                  such  Subclass,  to the  extent  the amount  available for
                                  distribution with respect to  such Subclass is  sufficient
                                  therefor, in accordance with the following priorities: (i)
                                  any  request by a Deceased Holder,  in an amount up to but
                                  not exceeding an aggregate  principal balance of  $100,000
                                  per  request; and (ii) any request  by a Living Holder, in
                                  an amount up to but  not exceeding an aggregate  principal
                                  balance  of $10,000 per request. Thereafter, distributions
                                  will be made as provided in clauses (i) and (ii) above  up
                                  to  a  second  $100,000  and  $10,000,  respectively. This
                                  sequence of priorities will  be repeated for each  request
                                  for  principal distributions made by the beneficial owners
                                  of the  Class A-17  Certificates until  all such  requests
                                  have  been honored. If  amounts available for distribution
                                  on any Distribution Date with respect to such Subclass are
                                  insufficient to fulfill the requests for distributions  of
                                  principal  on  the  Class  A-17  Certificates,  or  if any
                                  requests are not timely received, the unsatisfied requests
                                  will be treated as requests  for distribution on the  next
                                  succeeding   Distribution  Date  and  on  each  succeeding
                                  Distribution Date  thereafter,  until  all  requests  with
                                  respect to such Subclass are either honored or withdrawn.
                                  To  the extent that the  amount available for distribution
                                  in respect of principal of the Class A-17 Certificates  on
                                  any   Distribution   Date   exceeds   all   requests   for
                                  distribution  of  principal  on  such  Subclass,   certain
                                  holders  of Class A-17 Certificates will receive mandatory
                                  distributions of principal.  Such mandatory  distributions
                                  of  principal  will be  made  in $1,000  lots,  rounded as
                                  necessary, to  beneficial  owners selected  in  accordance
                                  with specified random lot procedures.
                                  Notwithstanding   the   foregoing   procedures,   on  each
                                  Distribution Date following the first Distribution Date on
                                  which any  principal  losses  are  allocated  to  Class  A
                                  Certificateholders,  principal distributions  on the Class
                                  A-17 Certificates (including  amounts paid  in respect  of
                                  such  losses under the Policy) will be made pro rata among
                                  the holders of the Class A-17 Certificates.
</TABLE>
 
                                      S-23
<PAGE>
 
<TABLE>
<S>                               <C>
                                  There can be no assurance that funds will be available  to
                                  make   distributions  of   principal  on   any  particular
                                  Distribution Date  to  those  Deceased  Holders  on  whose
                                  behalf  requests have  been submitted  or to  those Living
                                  Holders who have submitted requests or, even if funds  are
                                  available   to   make   such   distributions,   that  such
                                  distributions will be made with respect to the Class  A-17
                                  Certificates  held  by  any  particular  beneficial owner.
                                  Accordingly, such requests may not be honored  immediately
                                  upon  submission and may, in  fact, remain outstanding for
                                  some period of  time. In addition,  because of the  random
                                  lot  procedure, there is also no assurance that beneficial
                                  owners of Class A-17 Certificates who have not requested a
                                  distribution  of  principal  on  their  Certificates  will
                                  receive  distributions  of  principal  on  any  particular
                                  Distribution  Date  on  which  the  amount  available  for
                                  distribution  in  respect  of principal  to  such Subclass
                                  exceeds the aggregate amount requested for distribution of
                                  principal on the Class A-17 Certificates.
                                  For a further discussion of the procedures, priorities and
                                  limitations applicable to the distribution of principal to
                                  the Class  A-17  Certificates,  see  "Description  of  the
                                  Certificates  -- Distributions in Reduction of the Class A
                                  Subclass Principal Balance of the Class A-17 Certificates"
                                  in this Prospectus Supplement.
                                  THE  CLASS  A-17  CERTIFICATES  MAY  NOT  BE   APPROPRIATE
                                  INVESTMENTS  FOR ANY  INVESTOR WHO REQUIRES  A SINGLE LUMP
                                  SUM PAYMENT  ON  A  PREDETERMINED  DATE  OR  AN  OTHERWISE
                                  PREDICTABLE  STREAM  OF  PRINCIPAL PAYMENTS.  THERE  IS NO
                                  ASSURANCE THAT ANY  INVESTOR IN A  CLASS A-17  CERTIFICATE
                                  WILL  RECEIVE A DISTRIBUTION IN REDUCTION OF ITS PRINCIPAL
                                  BALANCE ON A PARTICULAR DISTRIBUTION DATE.
Credit Enhancement..............  DESCRIPTION OF  "SHIFTING-INTEREST"  SUBORDINATION.    The
                                  rights  of  the holders  of  the Class  B  Certificates to
                                  receive distributions will be  subordinated to the  rights
                                  of  the holders of the  Class A Certificates and Financial
                                  Security 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 B  Certifi-
                                  cates) against delays in the receipt of scheduled payments
                                  of  interest and  principal and  against losses associated
                                  with the  liquidation  of  defaulted  Mortgage  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 made on any Distribution Date in
                                  respect of  the  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  B Certificates  and  (ii)  by the
                                  allocation  to  the  Class   B  Certificates,  until   the
                                  principal  balance thereof  has been  reduced to  zero, of
                                  certain  losses   resulting   from  the   liquidation   of
</TABLE>
 
                                      S-24
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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 addition, in order to increase the period during  which
                                  the  principal balance of the Class B Certificates remains
                                  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.   This   allocation   has   the   effect  of
                                  accelerating the amortization of the Class A  Certificates
                                  (other than the Class A-7 Certificates with respect to the
                                  Class A-7 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 B Certificates.
                                  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  B  Certificates  (which
                                  aggregate    balance   is   expected   initially   to   be
                                  approximately $33,291,970) has been reduced to zero.  Such
                                  losses  will be allocated among  the Subclasses of Class B
                                  Certificates, in reverse numerical order (that is, to  the
                                  Class  B-6, Class B-5, Class B-4, Class B-3, Class B-2 and
                                  Class B-1  Certificates,  respectively). The  Policy  will
                                  cover  any losses of principal allocated to the Class A-17
                                  Certificates.
                                  With respect to  any Distribution Date  subsequent to  the
                                  first  Distribution Date,  the availability  of the credit
                                  enhancement provided by the  Class B Certificates will  be
                                  affected  by the prior reduction  of the principal balance
                                  of the Class  B Certificates. Reduction  of the  principal
                                  balance  of the 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   1996-1
                                  Certificates, the amount of losses attributable to special
                                  hazards, fraud and bankruptcy that will be absorbed solely
                                  by  the  holders  of  the  Class  B  Certificates  will be
                                  approximately 1.00%, 2.00% and 0.04%, respectively, of the
                                  Cut-Off Date Aggregate Principal
</TABLE>
 
                                      S-25
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Balance of the  Mortgage Loans (approximately  $5,548,517,
                                  $11,097,033  and $206,884, respectively). If losses due to
                                  special hazards, fraud  or bankruptcy exceed  any of  such
                                  amounts  prior  to the  principal balance  of the  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-7
                                  Certificates with respect to  the Class A-7 PO  Component)
                                  and  the Class B Certificates and  (ii) to the extent such
                                  losses arise with respect to Discount Mortgage Loans,  the
                                  Class  A-7 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 and  Class B Certificates  and Financial Security
                                  based on their respective interest accrual amounts and  by
                                  the  premium otherwise payable  to Financial Security. The
                                  Policy will cover any such  losses allocated to the  Class
                                  A-17 Certificates. Under certain circumstances, the limits
                                  set   forth  above  may  be  reduced  as  described  under
                                  "Description of the Certificates -- Subordination of Class
                                  B Certificates -- Allocation of Losses" in this Prospectus
                                  Supplement.
                                  After the principal  balance of the  Class B  Certificates
                                  has  been reduced  to zero,  the principal  portion of all
                                  losses (other than the  portion attributable to the  Class
                                  A-7  PO Component of  the Class A-7  Certificates, if any)
                                  will be allocated to the Class A Certificates (other  than
                                  the  Class A-7 Certificates with  respect to the Class A-7
                                  PO Component).  To  the  extent  such  losses  arise  with
                                  respect  to Discount  Mortgage Loans, such  losses will be
                                  shared among the Class A Certificates, according to  their
                                  respective  interests  in  such  Mortgage  Loans,  and the
                                  interest portion of such losses will be borne by the Class
                                  A  Certificates  and  the  premium  otherwise  payable  to
                                  Financial  Security. The  principal portion  of any losses
                                  borne by the Class A Certificates (other than losses borne
                                  by the Class  A-7 Certificates with  respect to the  Class
                                  A-7   PO  Component)  will  be  shared  pro  rata  by  the
                                  Subclasses  of  Class  A   Certificates  based  on   their
                                  then-outstanding principal balances or, in the case of the
                                  Class  A-7 Certificates,  the sum  of the then-outstanding
                                  component principal balances of  the Class A-7  Components
                                  (other  than the Class A-7  PO Component) or, with respect
                                  to the Class A-7 Accrual Component, the initial  component
                                  principal  balance of the Class  A-7 Accrual Component, 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   B  Certificates  --
                                  Allocation of Losses" in  this Prospectus Supplement.  The
                                  Policy  will cover any such  losses allocated to the Class
                                  A-17 Certificates.
                                  FINANCIAL GUARANTY INSURANCE  POLICY.  Financial  Security
                                  will  issue the Policy as  a means of providing additional
                                  credit enhancement to  the Class  A-17 Certificates  only.
                                  Under  the Policy,  Financial Security will  pay the Trust
                                  Administrator, for the
</TABLE>
 
                                      S-26
<PAGE>
 
<TABLE>
<S>                               <C>
                                  benefit of  holders of  Class A-17  Certificates, on  each
                                  Distribution  Date, (i) the excess,  if any, of the amount
                                  of interest accrued with respect to each of the Class A-17
                                  Certificates  over  the  amount  actually  available   for
                                  distribution  to such  Subclass, net  of any Non-Supported
                                  Interest Shortfalls allocated  to such  Subclass that  are
                                  covered by the Reserve Fund, on such Distribution Date and
                                  (ii)  the portion of any  losses of principal allocated to
                                  such Subclass in respect  of such Distribution Date.  Once
                                  the  Reserve  Fund  has been  reduced  to  zero, Financial
                                  Security  will   also  pay   any  Non-Supported   Interest
                                  Shortfalls  allocated  to  the  Class  A-17  Certificates.
                                  Financial Security is a New York insurance company engaged
                                  in the business of  writing financial guaranty  insurance,
                                  principally  in  respect  of  securities  offered  in  the
                                  domestic  and   foreign  markets.   Financial   Security's
                                  claims-paying  ability is rated "Aaa" by Moody's Investors
                                  Service, Inc. ("Moody's") and "AAA" by each of S&P, Nippon
                                  Investors Service, Inc. and Standard & Poor's  (Australia)
                                  Pty.  Ltd.  See "Description  of  the Certificates  -- The
                                  Financial Guaranty  Insurance  Policy" and  "--  Financial
                                  Security Assurance Inc." 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  Class  B
                                  Certificates  due  to the  disproportionate  allocation of
                                  such prepayments to investors in the Class A  Certificates
                                  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  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
</TABLE>
 
                                      S-27
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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. The yield experienced by  an investor in the  Class
                                  A-18 Certificates, which do not bear interest, is solely a
                                  function  of the price paid by such investor, the rate and
                                  timing of  principal payments  on the  Mortgage Loans  and
                                  losses  incurred  on and  after  the Cross-Over  Date. The
                                  particular sensitivity of the  Class A-18 Certificates  is
                                  displayed   in  a   table  appearing   under  the  heading
                                  "Prepayment and Yield  Considerations" in this  Prospectus
                                  Supplement.   AN  INVESTOR  THAT   PURCHASES  ANY  OFFERED
                                  CERTIFICATES AT A  DISCOUNT, PARTICULARLY  THE CLASS  A-18
                                  CERTIFICATES,  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 PAY-
                                  MENTS 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 an amount equal to its  unpaid
                                  principal balance (that is, 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 or, in the case of
                                  the Class A-18 Certificates, the expected yield, which  is
                                  based  on the price  paid by the investor  and the rate of
                                  prepayments anticipated by such investor. 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
</TABLE>
 
                                      S-28
<PAGE>
 
<TABLE>
<S>                               <C>
                                  interest  rates. During  such periods,  it is  less likely
                                  that mortgagors will elect to prepay 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.
                                  The principal  payment  priorities and  principal  payment
                                  schedules  for  the Scheduled  Certificates and  Class A-6
                                  Components set forth herein under the heading "Description
                                  of the Certificates  -- Principal (Including  Prepayments)
                                  --  Allocation of Amount to  be Distributed" were designed
                                  to provide a certain amount  of protection to the  holders
                                  of   the   Scheduled  Certificates   and  the   Class  A-6
                                  Certificates against  extension  of the  weighted  average
                                  lives thereof due to low rates of prepayment under certain
                                  prepayment  scenarios. No prediction can be made as to the
                                  actual level of  prepayments that will  be experienced  on
                                  the  Mortgage Loans and no assurance can be given that the
                                  principal  payment   priorities  and   principal   payment
                                  schedules  of  the  Scheduled Certificates  and  Class A-6
                                  Components will provide  protection against the  extension
                                  of  the  weighted  average lives  of  such  Subclasses and
                                  Components.  See  "Description  of  the  Certificates   --
                                  Principal  (Including Prepayments) -- Allocation of Amount
                                  to   be   Distributed"    and   "Prepayment   and    Yield
                                  Considerations" herein.
                                  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  LIFE OF THE  CLASS A-8 CERTIFICATES
                                  WILL BE PARTICULARLY SENSITIVE TO THE RATE OF  PREPAYMENTS
                                  ON   THE   MORTGAGE   LOANS.  SEE   "DESCRIPTION   OF  THE
                                  CERTIFICATES  --  PRINCIPAL  (INCLUDING  PREPAYMENTS)   --
                                  ALLOCATION  OF AMOUNT  TO BE  DISTRIBUTED" AND "PREPAYMENT
                                  AND YIELD CONSIDERATIONS" HEREIN.
                                  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 and Class  A-6 Certificates, the Class A-7
                                  Accrual Component, the
</TABLE>
 
                                      S-29
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Class A-7 IO A  Component, the Class  A-7 IO B  Component,
                                  the  Class  A-7 PO  Component, the  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-17, Class A-18 and
                                  Class A-19  Certificates and  the  Class B-1,  Class  B-2,
                                  Class B-3, Class B-4, Class B-5 and Class B-6 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.
                                  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. The  Class A-18  Certificates will  be  issued
                                  with  original issue  discount in  an amount  equal to the
                                  excess of the initial principal balance thereof over their
                                  issue  price.   It   is   anticipated   that   the   Class
                                  Certificates  will be issued  with original issue discount
                                  in  an  amount  equal  to  the  excess  of  their  initial
                                  principal  balances over their respective issue prices. It
                                  is also  anticipated  that  the  Class  A-  and  Class  A-
                                  Certificates  will  be issued  at a  premium and  that the
                                  Class      Certificates  will be  issued with  DE  MINIMIS
                                  original  issue discount for  federal income tax purposes.
                                  It is further anticipated that  the Class B-1, Class  B-2,
                                  Class B-3, Class B-4, Class B-5 and Class B-6 Certificates
                                  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 and Class A-LR 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
</TABLE>
 
                                      S-30
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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  could  give
                                  rise  to a  transaction prohibited  or not  otherwise per-
                                  missible under ERISA, the Code or Similar Law. NEITHER THE
                                  CLASS A-R CERTIFICATE NOR  THE CLASS A-LR CERTIFICATE  MAY
                                  BE  PURCHASED  BY OR  TRANSFERRED  TO A  PLAN.  See "ERISA
                                  Considerations" in this Prospectus  Supplement and in  the
                                  Prospectus.
Legal Investment................  The Offered 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 Offered Certificates are legal
                                  investments for certain entities to the extent provided in
                                  such 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.  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-31
<PAGE>
                                  RISK FACTORS
 
GENERAL
 
    The  rate  of distributions  in reduction  of the  principal balance  of any
Subclass of  Offered  Certificates, the  aggregate  amount of  distributions  of
principal  and interest on any Subclass of Offered Certificates and the yield to
maturity of any Subclass 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,
particularly the Class A-18 Certificates, 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.
 
DISTRIBUTIONS IN REDUCTION OF THE CLASS A SUBCLASS PRINCIPAL BALANCE OF THE
CLASS A-17 CERTIFICATES
 
    Although, as described herein, there can be  no assurance as to the rate  at
which   principal  distributions  will  be  made  on  any  Subclass  of  Offered
Certificates, the Class A-17 Certificates, in particular, would 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 is no assurance  that funds available for distributions  of
principal  will  be  sufficient  to  permit  the  distributions  requested  by a
Beneficial Owner of  a Class  A-17 Certificate to  be made  within any  specific
period  of  time  after  distribution  is  requested.  During  periods  in which
prevailing interest rates are  generally higher than  the Pass-Through Rate  for
the   Class  A-17  Certificates,   greater  numbers  of   Beneficial  Owners  of
Certificates of  such  Subclass may  be  expected to  request  distributions  of
principal  in respect of their  Certificates in order to  take advantage of such
prevailing interest  rates.  During  such  periods  there  may,  however,  be  a
concurrent  reduction in  the rate  of prepayments  of the  Mortgage Loans, thus
limiting the funds available for such distributions.
 
BOOK-ENTRY SYSTEM FOR CERTAIN CLASSES AND SUBCLASSES OF CERTIFICATES
 
    Transactions in  the 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  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-32
<PAGE>
                        DESCRIPTION OF THE CERTIFICATES
 
DENOMINATIONS
 
    The Offered Certificates, other  than the Class A-6,  Class A-8, Class  A-9,
Class  A-17, Class A-18, Class A-19, Class A-R and Class A-LR Certificates, will
be issued  in minimum  denominations of  $25,000 initial  principal balance  and
integral  multiples of $1,000  initial principal balance  in excess thereof. The
Class A-9  Certificates  will be  issued  in minimum  denominations  of  $25,000
initial  principal balance  and integral  multiples of  $1,000 initial principal
balance in excess thereof, except that one of the Class A-9 Certificates may  be
issued  in any denomination in excess  of $25,000 initial principal balance. The
Class A-6, Class A-8, Class A-18 and  Class A-19 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. The Class  A-17
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-18, Class A-R, and
Class A-LR Certificates will be issued as Definitive Certificates. Distributions
of principal of, and  interest on, the Definitive  Certificates will be made  by
the  Trust Administrator 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  Trust Administrator  or other  certificate
registrar. No service charge will be imposed for any registration of transfer or
exchange, but the Trust Administrator 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  the Class A and Class B Certificates  will be made monthly, to the extent of
each Subclass' 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 August  1996. With  respect to  the Class  A Certificates
(other than  the  Class  A-7 Certificates  with  respect  to the  Class  A-7  PO
Component),  such distributions  will be made,  to the extent  of each Subclass'
entitlement thereto,  in  an  aggregate  amount equal  to  the  Class  A  Non-PO
Distribution   Amount.  With  respect  to  the  Class  A-7  PO  Component,  such
distributions will  be made,  to the  extent  of the  Class A-7  PO  Component's
entitlement  thereto, on each Distribution Date in  an amount equal to the Class
A-7   PO    Component   Principal    Distribution   Amount    after   all    the
 
                                      S-33
<PAGE>
following  amounts have been paid: interest due  on the Class A Certificates for
such Distribution Date including all previously unpaid Class A Subclass Interest
Shortfall Amounts with  respect to  any Subclass  of Class  A Certificates,  the
Premium  Payment  due to  Financial Security  and  any unpaid  Premium Shortfall
Amounts.  See  "Description  of  the  Certificates  --  Interest"  herein.   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  Trust Administrator and
specified in the notice of final distribution in respect of such Certificate.
 
    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  and (ii) the  Master
    Servicing Fee;
 
        (d)  all  amounts  representing  scheduled  payments  of  principal  and
    interest due  after  the Due  Date  occurring in  the  month in  which  such
    Distribution Date occurs;
 
        (e)   all  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 on or
    following the Due Date in the month in which such Distribution Date occurs;
 
                                      S-34
<PAGE>
        (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
    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;
 
        (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
    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 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  Trust Administrator  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 Trust
Administrator 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 (other  than the  Class
A-18 Certificates) and to Financial Security, pro rata based on their respective
Class  A Subclass Interest Accrual Amounts and  the Premium Payment, as the case
may be, in an aggregate  amount up to the sum  of the Class A Subclass  Interest
Accrual  Amounts and the Premium Payment with respect to such Distribution Date;
provided, that prior to the Cross-Over Date, an amount equal to the amount  that
would  otherwise  be  distributable in  respect  of  interest of  the  Class A-7
Certificates by  virtue of  the Class  A-7 Accrual  Component pursuant  to  this
provision  will be  distributed in reduction  of the Class  A Subclass Principal
Balances and Component Principal Balances of certain of the Group I Certificates
and Components as set forth below under "-- Principal (Including Prepayments) --
Allocation of Amount to be Distributed;"
 
      SECOND, to the Subclasses  of Class A Certificates  (other than the  Class
A-18 Certificates) and to Financial Security, pro rata based on their respective
unpaid  Class A Subclass Interest Shortfall Amounts and unpaid Premium Shortfall
Amounts, in an aggregate amount up to  the sum of the previously unpaid Class  A
Subclass    Interest   Shortfall   Amounts    and   unpaid   Premium   Shortfall
 
                                      S-35
<PAGE>
Amounts; provided, that  prior to the  Cross-Over Date, an  amount equal to  the
amount  that would otherwise be distributable  in respect of interest shortfalls
to the  Class A-7  Certificates by  virtue of  the Class  A-7 Accrual  Component
pursuant  to this  provision will  be distributed  in reduction  of the  Class A
Subclass Principal Balances and Component  Principal Balances of certain of  the
Group  I  Certificates and  Components as  set forth  below under  "-- Principal
(Including Prepayments) -- Allocation of Amount to be Distributed;"
 
      THIRD, concurrently, to the Class A Certificates (other than the Class A-7
Certificates with  respect to  the Class  A-7 PO  Component) and  the Class  A-7
Certificates  with respect to the Class A-7 PO Component, pro rata, based on the
Class A Non-PO Optimal Principal Amount  and the Class A-7 PO Component  Optimal
Principal Amount, (A) to the Subclasses of Class A Certificates, (other than the
Class  A-7  Certificates with  respect to  the  Class A-7  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-7 Certificates
with respect to the Class A-7 PO Component  in an amount up to the Class A-7  PO
Component Optimal Principal Amount;
 
      FOURTH,  to the Class  A-7 Certificates with  respect to the  Class A-7 PO
Component in an amount  up to the  Class A-7 PO  Component Deferred Amount,  but
only  from amounts otherwise distributable (without  regard to this priority) to
the Subclasses of Class B Certificates pursuant to priority FIFTH clause (C)  of
this Pool Distribution Amount Allocation; and
 
      FIFTH,  sequentially, to the  Class B-1, Class B-2,  Class B-3, Class B-4,
Class B-5 and Class  B-6 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 interest
shortfall  amount and (C) finally, an amount  up to its 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 FIFTH 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-7 PO
Component Deferred Amount in accordance with priority FOURTH.
 
    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 undivided percentage interest (the "Percentage Interest") represented by
any  Offered Certificate of a Subclass in distributions to such Subclass 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.
 
INTEREST
 
    The amount  of  interest  that will  accrue  on  each Subclass  of  Class  A
Certificates,  other than the Class A-18  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-7 and Class A-18 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,
 
                                      S-36
<PAGE>
allocable to such  Subclass on or  after the Cross-Over  Date. The  pass-through
rate  for each Subclass of Offered Certificates (the "Pass-Through Rate") is the
percentage set forth on the cover of this Prospectus Supplement.
 
    No interest will accrue on the Class A-18 Certificates.
 
    On each  Distribution Date  an amount  equal to  any Non-Supported  Interest
Shortfall  allocable to the Class A-17 Certificates will be distributed from the
Reserve Fund  to  the holders  of  the Class  A-17  Certificates to  the  extent
described  below.  The interest  portion of  any  Excess Special  Hazard Losses,
Excess Fraud Losses  and Excess Bankruptcy  Losses allocable to  the Class  A-17
Certificates  will be  covered by  the Policy,  together with  any Non-Supported
Interest Shortfall allocable  to the  Class A-17 Certificates  once the  Reserve
Fund  has been reduced to zero. See "-- The Financial Guaranty Insurance Policy"
below.
 
    The Class A Subclass Interest Accrual Amount for the Class A-7  Certificates
will  equal the sum of the Component  Interest Accrual Amounts for the Class A-7
Accrual Component, Class A-7 IO  A Component and Class  A-7 IO B 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-7 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-7 Certificates, (ii) the interest  portion of any Excess Special Hazard
Losses, Excess Fraud Losses and Excess Bankruptcy Losses allocable to the  Class
A-7  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-7 Certificates on
or after the Cross-Over Date.
 
    The Component Interest Accrual Amount for the Class A-7 IO A Component  will
equal the difference between (a) the product of (i) 1/12th of the Component Rate
for such Component and (ii) the Class A-7 IO A Component Notional Amount 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-7 Certificates,  (ii)
the  interest portion of  any Excess Special Hazard  Losses, Excess Fraud Losses
and Excess Bankruptcy Losses allocable to  the Class A-7 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-7 Certificates on or after the Cross-Over Date.
 
    The  Component Interest Accrual Amount for the Class A-7 IO B Component will
equal the difference  between (a) the  product of (i)  1/12th of the  difference
between  (A) the  weighted average  of the  Net Mortgage  Interest Rates  of the
Mortgage Loans that have Net Mortgage  Interest Rates (as defined on page  S-40)
greater  than 7.50% (the  "Premium Mortgage Loans")  as of the  first day of the
month preceding the month in which  the applicable Distribution Date occurs  and
(B)  7.50% and (ii) the Class A-7 IO B Component Notional Amount and (b) the sum
of such  Component's pro  rata share  based  upon interest  accrued of  (i)  any
Non-Supported  Interest Shortfall allocable to  the Class A-7 Certificates, (ii)
the interest portion of  any Excess Special Hazard  Losses, Excess Fraud  Losses
and  Excess Bankruptcy Losses allocable to  the Class A-7 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-7 Certificates on or after the Cross-Over Date.
 
    The "Component Rate" for  each of the Class  A-7 Components (other than  the
Class A-7 IO B Component and the Class A-7 PO Component) is 7.50%.
 
                                      S-37
<PAGE>
    The  Class  A-7 IO  A Component  is  an interest-only  Component and  has no
principal balance. The "Class A-7 IO  A Component Notional Amount" with  respect
to  each Distribution Date will be equal to  the product of (i)(a) the excess of
7.50% over the  weighted average  of the Pass-Through  Rates of  the Class  A-1,
Class  A-2, Class A-3, Class A-4 and Class A-5 Certificates divided by (b) 7.50%
and (ii) the sum of  the Class A Subclass Principal  Balances of the Class  A-1,
Class  A-2, Class  A-3, Class A-4  and Class A-5  Certificates. Accordingly, 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-1,  Class A-2, Class A-3, Class A-4 or Class A-5 Certificates will result in a
reduction in the  Class A-7 IO  A Component Notional  Amount. See "--  Principal
(Including  Prepayments)"  and  "--  Subordination of  Class  B  Certificates --
Allocation of Losses" herein. The Class A-7 IO A Component Notional Amount  with
respect to the first Distribution Date will be approximately $6,928,733.
 
    The  Class  A-7 IO  B Component  is  an interest-only  Component and  has no
principal balance. The "Class A-7 IO  B Component Notional Amount" with  respect
to  each Distribution  Date will be  equal to the  aggregate Scheduled Principal
Balance of the Premium  Mortgage Loans as of  such Distribution Date. The  Class
A-7  IO B Component Notional Amount with  respect to the first Distribution Date
will be approximately $351,638,280.
 
    No interest will  accrue on  the Class  A-7 PO  Component of  the Class  A-7
Certificates.
 
    On each Distribution Date, Financial Security will be entitled to receive an
amount  (the "Premium Payment") equal to (A)  the product of (i) 1/12th of 0.08%
and (ii) the outstanding  Class A Subclass Principal  Balance of the Class  A-17
Certificates, less (B) the sum of the pro rata portions of (i) any Non-Supported
Interest  Shortfall, (ii) the interest portion  of Excess Special Hazard Losses,
Excess Fraud Losses and Excess Bankruptcy Losses for such Distribution Date  and
(iii)  on or  after the  Cross-Over Date, 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.
 
    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
Class,  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 7.50% 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-6, Class A-7 and Class A-8 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, 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' 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-7 Certificates with  respect to the  Class
A-7  PO Component)  in the  manner described  herein under  "-- Subordination of
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' 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-6, Class A-7 and Class A-8 Certificates), the Class  A-6
Components,  the Class A-7 Accrual Component and the Class A-8 Components on the
basis of their then-outstanding Class A Subclass Principal Balances or Component
Principal Balances or in the case of the Class A-7 Accrual Component its initial
Component Principal  Balance,  if  lower, immediately  prior  to  the  preceding
Distribution Date.
 
                                      S-38
<PAGE>
    The  Class  A Subclass  Principal  Balance of  the  Class A-6  or  Class A-8
Certificates as  of any  Determination Date  will be  equal to  the sum  of  the
Component  Principal  Balances  of their  Components  and the  Class  A Subclass
Principal Balance of  the Class A-7  Certificates as of  any Determination  Date
will  be the sum  of the Component  Principal Balances of  the Class A-7 Accrual
Component and the Class A-7 PO Component.
 
    The "Component Principal Balance"  of each Component  (other than the  Class
A-7  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 plus,
in the case of the Class A-7 Accrual Component, the Class A-7 Accrual  Component
Distribution  Amount, as described under  "-- Principal (Including Prepayments)"
below, previously added  to the  Component Principal  Balance of  the Class  A-7
Accrual  Component, less  (i) all amounts  previously distributed  to holders of
such Subclass 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-7 Certificates
with respect to the Class A-7 PO Component) in the manner described herein under
"-- Subordination of Class  B Certificates -- Allocation  of Losses." After  the
Cross-Over  Date,  the  Component Principal  Balance  of each  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   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-6, Class A-7 and Class A-8 Certificates), the Class A-6 Components, the  Class
A-7  Accrual  Component and  the  Class A-8  Components  on the  basis  of their
then-outstanding Class  A Subclass  Principal  Balances or  Component  Principal
Balances  or,  in the  case  of the  Class  A-7 Accrual  Component,  its initial
Component Principal  Balance,  if  lower, immediately  prior  to  the  preceding
Distribution Date.
 
    The  "Component Principal Balance" of  the Class A-7 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-7 Certificates in respect of the Class
A-7 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-7 PO Component in the manner described herein under "--
Subordination  of  Class  B Certificates  --  Allocation of  Losses."  After the
Cross-Over Date, the Component Principal Balance  of the Class A-7 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-7 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-7 Certificates) and the Component
Principal Balance of the Class A-7 Accrual Component as of such 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 B Certificates -- Allocation
of Losses" and  (b) the Adjusted  Pool Amount as  of the preceding  Distribution
Date  less the sum of  (i) Class A Non-PO  Principal Balance, (ii) the Component
Principal Balance of the Class A-7 PO Component, and (iii) the Class B  Subclass
Principal  Balances  of  the  Subclasses  of  Class  B  Certificates  with lower
numerical designations, each as of such Determination Date.
 
                                      S-39
<PAGE>
    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
the  Series  1996-1  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  1996-1 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 and (ii) the
Master Servicing Fee Rate  as set forth in  the Pooling and Servicing  Agreement
for  such  Mortgage Loan.  See  "Servicing of  the  Mortgage Loans  -- 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 Trust  Administrator  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.
 
                                      S-40
<PAGE>
"Month End Interest"  for each Distribution  Date with respect  to the  Mortgage
Loans serviced by each Other Servicer 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
Account  pursuant  to  the  related  Underlying  Servicing  Agreement  on   such
Distribution  Date (other  than with respect  to the Mortgage  Loans serviced by
Countrywide Funding Corporation).  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  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 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  and
the  Premium  Payment  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  and Class B Principal Balance and
(ii) the Subclasses of Class B Certificates according to the percentage obtained
by dividing the then-outstanding Class B Subclass Principal Balance of each such
Subclass by the sum of the then-outstanding Class A Non-PO 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-7 Certificates  with respect to  the Class  A-7
Accrual  Component  prior to  the  Cross-Over Date,  will  reduce the  amount of
interest accrued on and added to  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 B  Certificates.
Any  such reduction in respect of interest allocable to the Class A Certificates
and Financial  Security  will be  allocated  among  the Subclasses  of  Class  A
Certificates  and the Premium Payment pro rata  on the basis of their respective
Class A  Subclass  Interest Accrual  Amounts  and  the amount  of  such  Premium
Payment,  as the case may  be, without regard to  any reduction pursuant to this
paragraph, for  such Distribution  Date.  Any Non-Supported  Interest  Shortfall
allocated  to the Class A-7  Certificates will be allocated  among the Class A-7
Components (other than  the Class A-7  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,
other than 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 Class B Certificates, and then,
pro rata by the Class A Certificates and Financial Security. See "Description of
the Certificates --  Subordination of  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 and  the  Premium
Payment payable to Financial Security. However, such shortfalls allocated to the
 
                                      S-41
<PAGE>
Class  A-17  Certificates  will be  offset  to  the extent  funds  are available
therefor, from amounts  on deposit in  Reserve Fund. Once  the Reserve Fund  has
been reduced to zero, such shortfalls will be covered by the Policy.
 
    A  reserve fund will be established at the time of the issuance of the Class
A-17 Certificates (the  "Reserve Fund") by  an initial deposit  into a  separate
account  maintained  by the  Trust  Administrator of  approximately $       . No
additional amounts will  be deposited into  the Reserve Fund  after the  initial
deposit. The Reserve Fund will be beneficially owned by Lehman Brothers and will
not be an asset of the Trust Estate or the Upper-Tier or Lower-Tier REMIC.
 
    A  withdrawal will  be made  on each  Distribution Date  from the  amount on
deposit in the Reserve Fund, to the extent available, to cover any Non-Supported
Interest Shortfalls allocated to the Class A-17 Certificates. A withdrawal  from
the Reserve Fund may only be made, to the extent funds are available therein, to
cover  any Non-Supported Interest  Shortfall allocated to  such Subclass and may
not be made to cover any Non-Supported Interest Shortfall allocated to any other
Subclass. Once the Reserve Fund has been reduced to zero, the Policy will  cover
any Non-Supported Interest Shortfalls allocated to the Class A-17 Certificates.
 
    The  balance of any amount remaining in the Reserve Fund on the Distribution
Date on  which  the  Class  A  Subclass Principal  Balance  of  the  Class  A-17
Certificates are reduced to zero will be distributed to Lehman Brothers.
 
    The  interest  portion of  any Excess  Special  Hazard Losses,  Excess Fraud
Losses or Excess Bankruptcy Losses will be allocated among the Class A and Class
B Certificates and the Premium Payment pro rata based on the interest accrued on
each such Class or the amount of  such Premium Payment and among the  Subclasses
of  Class  A Certificates  pro rata  on the  basis of  their respective  Class A
Subclass Interest Accrual Amounts, without  regard to any reduction pursuant  to
this  paragraph, for such  Distribution Date. Any amount  allocated to the Class
A-7 Certificates will be  allocated among the Class  A-7 Components (other  than
the  Class A-7 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. The  Policy will cover  any such losses
allocated to  the  Class  A-17  Certificates. See  "--  The  Financial  Guaranty
Insurance Policy" below.
 
    Allocations  of the interest  portion of Realized  Losses (other than Excess
Special Hazard Losses, Excess Fraud Losses or Excess Bankruptcy Losses) first to
the Class B Certificates will result from the priority of distributions first to
the holders  of the  Class A  Certificates and  Financial Security  of the  Pool
Distribution Amount as described above under "Description of the Certificates --
Distributions."  The  Policy  will  cover  any  such  losses  which,  after  the
Cross-Over Date, are allocated to the Class A-17 Certificates.
 
    On each Distribution Date  on which the Pool  Distribution Amount equals  or
exceeds the sum of the Class A Subclass Interest Accrual Amounts and the Premium
Payment,  distributions  in respect  of  interest to  each  Subclass of  Class A
Certificates will equal such Subclass' Class A Subclass Interest Accrual  Amount
and  the  amount  distributable to  Financial  Security will  equal  the Premium
Payment. On each Distribution Date, interest in an amount equal to the Component
Interest Accrual Amount of the Class A-7 Accrual Component will accrue  thereon,
but  such  amount  will  not  be  distributed  as  interest  to  the  Class  A-7
Certificates until the Cross-Over Date. Prior  to such time, an amount equal  to
the  Component Interest Accrual Amount for  the Class A-7 Accrual Component will
instead be distributed in reduction of  the Class A Subclass Principal  Balances
and  Component Principal  Balances of  certain of  the Group  I Certificates and
Components as described under "-- Principal (Including Prepayments)" below,  and
the  Component  Principal Balance  of the  Class A-7  Accrual Component  will be
increased by a corresponding amount.
 
    If, on any Distribution Date, the Pool Distribution Amount is less than  the
sum  of the Class A  Subclass Interest Accrual Amounts  and the Premium Payment,
the amount of interest currently distributed on the Class A Certificates and the
amount of the Premium Payment  currently distributed to Financial Security  will
equal   the  Pool   Distribution  Amount  and   will  be   allocated  among  the
 
                                      S-42
<PAGE>
Subclasses of Class A Certificates and Financial Security pro rata in accordance
with each such Subclass' Class A Subclass Interest Accrual Amount and  Financial
Security's  Premium Payment. Amounts so allocated will be distributed in respect
of interest to each Subclass of Class A Certificates (other than the Class  A-18
Certificates  and the Class A-7 Certificates in respect of the Class A-7 Accrual
Component prior to the Cross-Over Date)  and to Financial Security with  respect
to  its  Premium  Payment.  Any  difference  between  the  portion  of  the Pool
Distribution Amount  distributed in  respect of  current interest  to each  such
Subclass  of Class A Certificates or, in  the case of the Class A-7 Certificates
with respect to the  Class A-7 Accrual Component  prior to the Cross-Over  Date,
accrued  on  and  added  to  the Component  Principal  Balance  thereof,  and to
Financial Security in respect  of the Premium Payment  and the Class A  Subclass
Interest  Accrual Amount for such Subclass and  the Premium Payment, as the case
may be, with respect to  the related Distribution Date net,  in the case of  the
Class  A-17 Certificates, of any amounts paid  pursuant to the Policy in respect
of interest  for such  Distribution Date  (as  to each  Subclass, the  "Class  A
Subclass  Interest Shortfall Amount" and as  to Financial Security, the "Premium
Shortfall Amount") will be added to  the amount to be distributed on  subsequent
Distribution Dates to the extent that the Pool Distribution Amount is sufficient
therefor.  The Policy will cover any Class A Subclass Interest Shortfall Amounts
which may be  allocated to the  Class A-17 Certificates.  See "-- The  Financial
Guaranty  Insurance Policy" below. No interest will accrue on the unpaid Class A
Subclass Interest Shortfall  Amounts or  unpaid Premium  Shortfall Amounts.  The
Class  A Subclass Interest  Shortfall Amount of the  Class A-7 Certificates with
respect to  any  Distribution  Date  will  be  allocated  among  the  Class  A-7
Components  (other than  the Class  A-7 PO  Component) based  on their Component
Interest Accrual  Amounts  (such  shortfall  allocated  to  any  Component,  the
"Component  Interest Shortfall Amount").  In the event  that on any Distribution
Date prior to the Cross-Over Date the Pool Distribution Amount is less than  the
sum  of the Class A  Subclass Interest Accrual Amounts  and the Premium Payment,
resulting in Class A Subclass  Interest Shortfall Amounts and Premium  Shortfall
Amounts,  as described above, an amount equal to the Class A-7 Accrual Component
Distribution Amount would be distributed to certain of the Group I  Certificates
and  Components, notwithstanding that the holders of the Class A Certificates of
the Subclasses then entitled to receive distributions of interest and  Financial
Security  have received  less than  their respective  Class A  Subclass Interest
Accrual Amounts and Premium Payment 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  and Premium Payment, any
excess will then be  allocated first to pay  previously unpaid Class A  Subclass
Interest  Shortfall Amounts and  unpaid Premium Shortfall  Amounts. Such amounts
will be allocated among  the Subclasses of Class  A Certificates and the  amount
due Financial Security pro rata in accordance with the respective unpaid Class A
Subclass  Interest  Shortfall  Amounts  and  unpaid  Premium  Shortfall  Amounts
immediately prior to such Distribution Date.  Any amount allocated to the  Class
A-7  Certificates will be  allocated among the Class  A-7 Components (other than
the Class A-7 PO Component) based  on their unpaid Component Interest  Shortfall
Amounts.  Prior to the Cross-Over Date, the amount so allocated to the Class A-7
Accrual Component will  not be  distributed as interest  to the  holders of  the
Class  A-7 Certificates,  but will  instead be  distributed in  reduction of the
Class A Subclass Principal Balances and Component Principal Balances of  certain
of  the Group  I Certificates  and Components  as described  under "-- Principal
(Including Prepayments) -- Allocation  of Amount to  be Distributed" below,  and
the  Component  Principal Balance  of the  Class A-7  Accrual Component  will be
increased by a corresponding amount.
 
    Subject to the  payment of any  Class A-7 PO  Component Deferred 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 each  Subclass of  Class A
Certificates and  the  Premium Payment,  (ii)  the sum  of  the unpaid  Class  A
Subclass  Interest Shortfall  Amounts with respect  to each Subclass  of Class A
Certificates and the  unpaid Premium  Shortfall Amounts  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")  and  (B)  the
 
                                      S-43
<PAGE>
Class  A-7 PO Component  Optimal Principal Amount  (collectively with the amount
described in  clause (A),  the  "Senior Optimal  Amount"),  any excess  will  be
allocated to make distributions in respect of interest and then principal on the
Subclasses of Class B Certificates.
 
    On  any Distribution Date on which the Pool Distribution Amount is less than
the Senior Optimal Amount,  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  Certificate of any Subclass at any time
is equal  to the  product of  the Class  A Subclass  Principal Balance  of  such
Subclass, 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  Component  Principal
Balance of the Class A-7 Accrual Component and (ii) in the case of the Class A-R
and Class A-LR Certificates, any additional amounts to which the holders of such
Certificates  may be entitled as described  below under "-- Additional Rights of
the Class A-R and Class A-LR Certificateholders") 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  approximate initial  Class A
Subclass Principal Balance of each Subclass of Offered Certificates is set forth
on the  cover  of this  Prospectus  Supplement.  The initial  Class  A  Subclass
Principal   Balance  of  the  Class   A-7  Certificates  will  be  approximately
$148,342,682.
 
    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-7 Certificates with  respect to the Class
A-7 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 Principal  Distribution  Amount.  The  "Class  A
Principal  Distribution Amount"  with respect to  any Distribution  Date will be
equal to the sum of (i) the Class A-7 Accrual Component Distribution Amount,  if
any,  with respect  to such  Distribution Date  and (ii)  the Class  A Principal
Amount with respect to such Distribution Date. The "Class A-7 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-7 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-7
Accrual Component on such Distribution  Date in accordance with priority  SECOND
of  the Pool Distribution Amount Allocation. The "Class A 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,
 
                                      S-44
<PAGE>
    (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 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 (other than the Class A-7 Certificates) or the Class A-7 Accrual
Component, each Subclass of Class  A Certificates or Component then  outstanding
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  or
Component  Principal Balance of such  Component 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 7.50% but shall not be
greater than 1.0.
 
    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  and to  the payment  of
principal  due on such Due Date, and  irrespective of any delinquency in payment
by the mortgagor and any net Partial Liquidation Proceeds applied as of such Due
Date and any principal prepayments in  full received prior to the  Determination
Date in the month of such Due 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 Trust Administrator,  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
 
                                      S-45
<PAGE>
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 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 93.91%.  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-7 Certificates  with respect  to the Class  A-7 PO  Component) and will
increase as  a result  of  the allocation  of Realized  Losses  to the  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>
August 1996 through July 2001..........  100%;
August 2001 through July 2002..........  the Class A Percentage, plus 70% of the Class B Percentage;
August 2002 through July 2003..........  the Class A Percentage, plus 60% of the Class B Percentage;
August 2003 through July 2004..........  the Class A Percentage, plus 40% of the Class B Percentage;
August 2004 through July 2005..........  the Class A Percentage, plus 20% of the Class B Percentage; and
August 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 then-outstanding Class B Principal Balance, or  (ii)
cumulative  Realized Losses with respect to the Mortgage Loans exceed (a) 30% of
the principal balance of the  Class B Certificates as  of the Cut-Off Date  (the
"Original  Subordinated  Principal Balance")  if  such Distribution  Date occurs
between and  including  August 2001  and  July 2002,  (b)  35% of  the  Original
Subordinated  Principal  Balance if  such Distribution  Date occurs  between and
including August  2002 and  July  2003, (c)  40%  of the  Original  Subordinated
Principal  Balance if such Distribution Date occurs between and including August
2003 and July 2004,  (d) 45% of the  Original Subordinated Principal Balance  if
such  Distribution Date occurs between and  including August 2004 and July 2005,
and (e) 50% of the Original Subordinated Principal Balance if such  Distribution
Date  occurs during  or after August  2005. 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-7 Certificates with respect to the
 
                                      S-46
<PAGE>
Class A-7 PO Component) while, in the absence of Realized Losses, increasing the
interest in the principal balance of the Mortgage Loans evidenced by the Class B
Certificates. Increasing the interest  of the Class  B Certificates relative  to
that  of the Class  A Certificates (other  than the Class  A-7 Certificates with
respect to the Class A-7 PO Component) is intended to preserve the  availability
of the subordination provided by the Class B Certificates. See "-- Subordination
of  Class B Certificates"  below. The "Class B  Percentage" for any Distribution
Date will  be  calculated  as  the  difference between  100%  and  the  Class  A
Percentage   for  such  date.  The  "Class  B  Prepayment  Percentage"  for  any
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-7 PO COMPONENT
 
    Distributions in reduction of the  Component Principal Balance of the  Class
A-7  PO Component will be made on  each Distribution Date in an aggregate amount
equal to the Class  A-7 PO Component Principal  Distribution Amount. The  "Class
A-7 PO Component Principal 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-7 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-7 PO Component  Deferred
Amount.
 
    The  "Class A-7 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-7 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-7 PO Component  Optimal Principal  Amount for all
prior Distribution  Dates  exceeds the  amounts  distributed to  the  Class  A-7
Certificates in respect of the Class A-7 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-7 PO Component
 
                                      S-47
<PAGE>
as  described  in "--  Subordination of  Class B  Certificates --  Allocation of
Losses" below and (ii) the  sum of the product  for each Discount Mortgage  Loan
which  became a Liquidated Loan in any  month preceding the month of 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-7
PO Component on prior Distribution Dates pursuant to priority FOURTH of the Pool
Distribution  Amount Allocation. On or after  the Cross-Over Date, the Class A-7
PO Component Deferred Amount will be zero. No interest will accrue on any  Class
A-7 PO Component Deferred Amount.
 
    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-7 PO Component, such Component if outstanding will be entitled to its share of
such  recovery in an  amount up to  the amount by  which the Component Principal
Balance of the Class A-7 PO Component  was reduced as a result of such  Realized
Loss.
 
    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 Mortgage Loan and  the
PO Fraction for such Mortgage Loan.
 
    ALLOCATION OF AMOUNT TO BE DISTRIBUTED
 
    On  each Distribution Date prior to the  Cross-Over Date, the sum of (a) the
product of (A) the Group I Percentage  and (B) the Class A Principal Amount  and
(b)  the Class A-7 Accrual Component Distribution Amount (such sum, the "Group I
Principal Distribution  Amount")  will be  allocated  among and  distributed  in
reduction  of the  Class A Subclass  Principal Balances  and Component Principal
Balances of the Group I Certificates and Components as follows:
 
    FIRST, (A) if  the Pool  Scheduled Principal Balance  for such  Distribution
Date  is less than the 400% SPA Targeted Balance for such Distribution Date, the
Group I Principal Distribution Amount will be allocated sequentially as follows:
 
    (i)concurrently, to the Class A-1 Certificates and the Class A-6 A Scheduled
       Component, pro  rata,  up  to their  respective  Scheduled  Amounts  with
       respect to such Distribution Date;
 
    (ii)
       sequentially  to  the  Class A-2,  Class  A-3,  Class A-4  and  Class A-5
       Certificates, up to  their respective Scheduled  Amounts with respect  to
       such Distribution Date;
 
    (iii)
       to  the Class A-6 B  Scheduled Component, up to  its Scheduled Amount for
       such Distribution Date determined in accordance with Schedule I;
 
    (iv)
       to the Class A-7 Accrual Component,  up to its Scheduled Amount for  such
       Distribution Date;
 
    (v)sequentially  to the Class A-8 A Component, the Class A-8 B Component and
       the Class A-6 B Scheduled Component,  without regard, in the case of  the
       Class  A-6 B Scheduled Component, to  its applicable Scheduled Amount for
       such Distribution Date,  until the  Component Principal  Balance of  each
       such Component has been reduced to zero;
 
    (vi)
       concurrently, to the Class A-1 Certificates and the Class A-6 A Scheduled
       Component, pro rata, without regard to their respective Scheduled Amounts
       for  such Distribution Date, until the Class A Subclass Principal Balance
       of such Subclass and  the Component Principal  Balance of such  Component
       have been reduced to zero;
 
                                      S-48
<PAGE>
    (vii)
       sequentially  to  the  Class A-2,  Class  A-3,  Class A-4  and  Class A-5
       Certificates, without regard  to their respective  Scheduled Amounts  for
       such  Distribution Date, until the Class  A Subclass Principal Balance of
       each such Subclass has been reduced to zero; and
 
    (viii)
       to the  Class A-7  Accrual  Component, without  regard to  its  Scheduled
       Amount, until its Component Principal Balance has been reduced to zero.
 
(B)  if  the Pool  Scheduled  Principal Balance  for  such Distribution  Date is
    greater than or equal  to the 400%  SPA Targeted Balance  but less than  the
    175%  SPA Targeted Balance for such Distribution Date, the Group I Principal
    Distribution Amount will be allocated sequentially as follows:
 
    (i)concurrently, to the Class A-1 Certificates and the Class A-6 A Scheduled
       Component, pro  rata,  up  to their  respective  Scheduled  Amounts  with
       respect to such Distribution Date;
 
    (ii)
       sequentially  to  the  Class A-2,  Class  A-3,  Class A-4  and  Class A-5
       Certificates, up to  their respective Scheduled  Amounts with respect  to
       such Distribution Date;
 
    (iii)
       to  the Class A-6 B  Scheduled Component, up to  its Scheduled Amount for
       such Distribution Date determined in accordance with Schedule I;
 
    (iv)
       to the Class A-7 Accrual Component,  up to its Scheduled Amount for  such
       Distribution Date;
 
    (v)sequentially  to the Class A-8 A Component  and the Class A-6 B Scheduled
       Component, without  regard, in  the case  of the  Class A-6  B  Scheduled
       Component, to its applicable Scheduled Amount for such Distribution Date,
       until  the Component  Principal Balance of  each such  Component has been
       reduced to zero;
 
    (vi)
       concurrently, to the Class A-1 Certificates and the Class A-6 A Scheduled
       Component, pro rata, without regard to their respective Scheduled Amounts
       for such Distribution Date, until the Class A Subclass Principal  Balance
       of  such Subclass and  the Component Principal  Balance of such Component
       have been reduced to zero;
 
    (vii)
       sequentially to  the  Class A-2,  Class  A-3,  Class A-4  and  Class  A-5
       Certificates,  without regard  to their respective  Scheduled Amounts for
       such Distribution Date, until the  Class A Subclass Principal Balance  of
       each such Subclass has been reduced to zero;
 
    (viii)
       to  the Class A-8 B Component,  until its Component Principal Balance has
       been reduced to zero; and
 
    (ix)
       to the  Class A-7  Accrual  Component, without  regard to  its  Scheduled
       Amount, until its Component Principal Balance has been reduced to zero.
 
(C)  if  the Pool  Scheduled  Principal Balance  for  such Distribution  Date is
    greater than or equal to the 175% SPA Targeted Balance for such Distribution
    Date, the  Group  I  Principal  Distribution Amount  will  be  allocated  as
    follows:
 
        (a)  FIRST, the  Group I Principal  Distribution Amount  (other than the
    Class  A-7  Accrual  Component   Distribution  Amount)  will  be   allocated
    sequentially as follows:
 
        (i)  concurrently, to  the Class  A-1 Certificates  and the  Class A-6 A
           Scheduled Component,  pro  rata,  up to  their  respective  Scheduled
           Amounts with respect to such Distribution Date;
 
        (ii)  sequentially to the Class A-2, Class  A-3, Class A-4 and Class A-5
           Certificates, up to their  respective Scheduled Amounts with  respect
           to such Distribution Date;
 
        (iii) to the Class A-6 B Scheduled Component, up to its Scheduled Amount
           for such Distribution Date determined in accordance with Schedule I;
 
                                      S-49
<PAGE>
        (iv) to the Class A-7 Accrual Component, without regard to its Scheduled
           Amount  for  such Distribution  Date,  until its  Component Principal
           Balance has been reduced to zero;
 
        (v) sequentially to the Class A-8 A Component, the Class A-8 B Component
           and the Class A-6 B Scheduled Component, without regard, in the  case
           of  the Class A-6 B Scheduled  Component, to its applicable Scheduled
           Amount for  such Distribution  Date,  until the  Component  Principal
           Balance of each such Component has been reduced to zero;
 
        (vi)  concurrently, to  the Class A-1  Certificates and the  Class A-6 A
           Scheduled Component,  pro rata,  without regard  to their  respective
           Scheduled  Amounts  for such  Distribution  Date, until  the  Class A
           Subclass  Principal  Balance  of  such  Subclass  and  the  Component
           Principal Balance of such Component have been reduced to zero; and
 
        (vii)  sequentially to the Class A-2, Class A-3, Class A-4 and Class A-5
           Certificates, without regard  to their  respective Scheduled  Amounts
           for  such  Distribution Date,  until the  Class A  Subclass Principal
           Balance of each such Subclass has been reduced to zero;
 
        (b) SECOND, the Class A-7 Accrual Component Distribution Amount will  be
    allocated sequentially as follows:
 
        (i)  concurrently, to  the Class  A-1 Certificates  and the  Class A-6 A
           Scheduled Component,  pro  rata,  up to  their  respective  Scheduled
           Amounts with respect to such Distribution Date;
 
        (ii)  sequentially to the Class A-2, Class  A-3, Class A-4 and Class A-5
           Certificates, up to their  respective Scheduled Amounts with  respect
           to such Distribution Date;
 
        (iii) to the Class A-6 B Scheduled Component, up to its Scheduled Amount
           for such Distribution Date determined in accordance with Schedule II;
           and
 
        (iv) to the Class A-7 Accrual Component, without regard to its Scheduled
           Amount  for  such Distribution  Date,  until its  Component Principal
           Balance has been reduced to zero.
 
    SECOND, to the Class A-9 Certificates, until the Class A Subclass  Principal
Balance thereof has been reduced to zero; and
 
    THIRD,  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.
 
    On  each Distribution Date prior to the  Cross-Over Date, the product of (A)
the Group II Percentage and (B) the  Class A Principal Amount will be  allocated
among and distributed in reduction of the Class A Subclass Principal Balances of
the Group II Certificates as follows:
 
    FIRST, to the Class A-19 Certificates, up to the Class A-19 Priority Amount;
 
    SECOND,  on each  Distribution Date  on and  after the  Distribution Date in
August 1999, concurrently, to  the Class A-17 and  Class A-18 Certificates,  pro
rata,  an amount up to the  product of (i) 0.1% and  (ii) the sum of the initial
Class  A  Subclass  Principal  Balances  of  the  Class  A-17  and  Class   A-18
Certificates, until the Class A Subclass Principal Balance of each such Subclass
has been reduced to zero;
 
    THIRD,  sequentially, to the Class A-10, Class A-11, Class A-12, Class A-13,
Class A-14, Class A-15 and Class  A-16 Certificates, until the Class A  Subclass
Principal Balance of each such Subclass has been reduced to zero;
 
    FOURTH,  concurrently, to  the Class A-17  and Class  A-18 Certificates, pro
rata, until the  Class A Subclass  Principal Balance of  each such Subclass  has
been reduced to zero; and
 
    FIFTH,  to the Class A-19 Certificates, until the Class A Subclass Principal
Balance hereof has been reduced to zero.
 
    The "Group I Percentage"  is equal to  approximately 73.0143637625% and  the
"Group II Percentage" is equal to approximately 26.9856362375%.
 
                                      S-50
<PAGE>
    The  "Class A-19 Priority Amount" for any Distribution Date means the lesser
of (i) the Class A Subclass Principal Balance of the Class A-19 Certificates and
(ii) the sum of (A) the product of (1) the Class A-19 Percentage, (2) the  Class
A-19  Scheduled Percentage  and (3) the  Scheduled Principal Amount  and (B) the
product of (1) the  Class A-19 Percentage, (2)  the Class A-19 Prepayment  Shift
Percentage, and (3) the Unscheduled Principal Amount.
 
    The  "Class A-19 Percentage" means the Class A Subclass Principal Balance of
the Class A-19 Certificates divided by the Pool Balance (Non-PO Portion).
 
    The "Class A-19 Scheduled Percentage" for any Distribution Date will be  the
percentage indicated below:
 
<TABLE>
<CAPTION>
DISTRIBUTION DATE OCCURING IN:                                                       CLASS A-19 SCHEDULED PERCENTAGE
- ----------------------------------------------------------------------------------  ---------------------------------
<S>                                                                                 <C>
August 1996 through July 2001.....................................................                      0%
August 2001 and thereafter........................................................                    100%
</TABLE>
 
    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-44, 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-44,  but
without that amount being multiplied by the Class A Prepayment Percentage.
 
    The  "Class A-19 Prepayment Shift Percentage" for any Distribution Date will
be the percentage indicated below:
 
<TABLE>
<CAPTION>
                                                                                   CLASS A-19 PREPAYMENT SHIFT
DISTRIBUTION DATE OCCURRING IN                                                             PERCENTAGE
- ----------------------------------------------------------------------------  -------------------------------------
<S>                                                                           <C>
August 1996 through July 2001...............................................                       0%
August 2001 through July 2002...............................................                      30%
August 2002 through July 2003...............................................                      40%
August 2003 through July 2004...............................................                      60%
August 2004 through July 2005...............................................                      80%
August 2005 and thereafter..................................................                     100%
</TABLE>
 
    As used above, the "Scheduled Amount" for any Distribution Date and for  any
Subclass  of Scheduled Certificates,  the Class A-6 Components  or the Class A-7
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 initial Component Principal Balance shown in the tables beginning on
page S-52 for such Distribution Date.
 
    As used above,  the "400% SPA  Targeted Balance" for  any Distribution  Date
means the amount equal to the percentage for such Distribution Date shown in the
following  table of the Cut-Off Date Aggregate Principal Balance of the Mortgage
Loans. The percentages set forth in the table were derived using the assumptions
described in the  last paragraph on  page S-91 and  assuming the Mortgage  Loans
prepay at a constant rate of 400% SPA.
 
    As  used above,  the "175% SPA  Targeted Balance" for  any Distribution Date
means the amount equal to the percentage for such Distribution Date shown in the
following table of the Cut-Off Date Aggregate Principal Balance of the  Mortgage
Loans. The percentages set forth in the table were derived using the assumptions
described  in the last  paragraph on page  S-91 and assuming  the Mortgage Loans
prepay at a constant rate of 175% SPA.
 
    Notwithstanding the foregoing,  on each  Distribution Date  occurring on  or
after  the Cross-Over  Date, the Class  A Principal Distribution  Amount will be
distributed among the Subclasses of Class A Certificates pro rata in  accordance
with  their respective outstanding  Class A Subclass  Principal Balances without
regard to either the proportions or the priorities set forth above.
 
                                      S-51
<PAGE>
    Except as described herein under "-- Distributions in Reduction of the Class
A Subclass Principal Balance of the Class A-17 Certificates" with respect to the
Class  A-17 Certificates, any amounts distributed  on a Distribution Date to the
holders of  Class A  Certificates  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.
 
    The  following  table sets  forth for  each Distribution  Date the  400% SPA
Targeted Balance and 175% SPA Targeted  Balance, each expressed as a  percentage
of the Cut-Off Date Aggregate Principal Balance of the Mortgage Loans.
                               TARGETED BALANCES
          AS A PERCENTAGE OF CUT-OFF DATE AGGREGATE PRINCIPAL BALANCE
 
<TABLE>
<CAPTION>
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------% ----------------%
August 1996..........     99.64072839       99.80514250
September 1996.......     99.21466044       99.58099664
October 1996.........     98.72204922       99.32764601
November 1996........     98.16328597       99.04520055
December 1996........     97.53890062       98.73379651
January 1997.........     96.84956180       98.39359647
February 1997........     96.09607651       98.02478917
March 1997...........     95.27938917       97.62758948
April 1997...........     94.40058030       97.20223816
May 1997.............     93.46086470       96.74900168
June 1997............     92.46158908       96.26817201
July 1997............     91.40422937       95.76006630
August 1997..........     90.29038736       95.22502657
September 1997.......     89.12178706       94.66341939
October 1997.........     87.90027045       94.07563540
November 1997........     86.62779290       93.46208897
December 1997........     85.30641805       92.82321767
January 1998.........     83.93831240       92.15948177
February 1998........     82.52573934       91.47136372
March 1998...........     81.07105298       90.75936755
April 1998...........     79.57669146       90.02401828
May 1998.............     78.04517001       89.26586125
June 1998............     76.47907371       88.48546145
July 1998............     74.88104992       87.68340283
August 1998..........     73.25380053       86.86028755
September 1998.......     71.60007389       86.01673522
October 1998.........     69.92265668       85.15338208
November 1998........     68.28344180       84.29785878
December 1998........     66.68222320       83.45039416
January 1999.........     65.11812684       82.61091360
February 1999........     63.59030444       81.77934582
March 1999...........     62.09792116       80.95561749
April 1999...........     60.64016128       80.13965597
May 1999.............     59.21622775       79.33138929
June 1999............     57.82534178       78.53074615
July 1999............     56.46674241       77.73765589
August 1999..........     55.13968610       76.95204851
September 1999.......     53.84344635       76.17385467
October 1999.........     52.57731330       75.40300564
November 1999........     51.34059335       74.63943335
December 1999........     50.13260879       73.88307035
January 2000.........     48.95269744       73.13384981
February 2000........     47.80021228       72.39170551
March 2000...........     46.67452113       71.65657185
April 2000...........     45.57500631       70.92838383
May 2000.............     44.50106427       70.20707705
June 2000............     43.45210532       69.49258771
July 2000............     42.42755326       68.78485259
August 2000..........     41.42684514       68.08380906
September 2000.......     40.44943089       67.38939506
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------  ----------------
<S>                    <C>               <C>
                                     %                 %
October 2000.........     39.49477305       66.70154912
November 2000........     38.56234651       66.02021030
December 2000........     37.65163818       65.34531827
January 2001.........     36.76214675       64.67681321
February 2001........     35.89338242       64.01463589
March 2001...........     35.04486661       63.35872761
April 2001...........     34.21613172       62.70903020
May 2001.............     33.40672090       62.06548605
June 2001............     32.61618777       61.42803806
July 2001............     31.84409620       60.79662968
August 2001..........     31.09002007       60.17120485
September 2001.......     30.35354304       59.55170806
October 2001.........     29.63425832       58.93808429
November 2001........     28.93176849       58.33027904
December 2001........     28.24568523       57.72823830
January 2002.........     27.57562914       57.13190857
February 2002........     26.92122955       56.54123684
March 2002...........     26.28212429       55.95617059
April 2002...........     25.65795952       55.37665777
May 2002.............     25.04838953       54.80264685
June 2002............     24.45307654       54.23408672
July 2002............     23.87169055       53.67092678
August 2002..........     23.30390913       53.11311690
September 2002.......     22.74941728       52.56060739
October 2002.........     22.20790723       52.01334901
November 2002........     21.67907828       51.47129302
December 2002........     21.16263667       50.93439109
January 2003.........     20.65829536       50.40259535
February 2003........     20.16577393       49.87585837
March 2003...........     19.68479843       49.35413315
April 2003...........     19.21510118       48.83737314
May 2003.............     18.75642067       48.32553220
June 2003............     18.30850142       47.81856464
July 2003............     17.87109381       47.31642518
August 2003..........     17.44395398       46.81906893
September 2003.......     17.02684368       46.32645147
October 2003.........     16.61953015       45.83852874
November 2003........     16.22178597       45.35525711
December 2003........     15.83338899       44.87659336
January 2004.........     15.45412214       44.40249465
February 2004........     15.08377337       43.93291855
March 2004...........     14.72213552       43.46782300
April 2004...........     14.36900620       43.00716635
May 2004.............     14.02418766       42.55090734
June 2004............     13.68748675       42.09900507
July 2004............     13.35871474       41.65141902
August 2004..........     13.03768726       41.20810906
September 2004.......     12.72422418       40.76903541
October 2004.........     12.41814956       40.33415868
November 2004........     12.11929147       39.90343983
</TABLE>
 
                                      S-52
<PAGE>
                               TARGETED BALANCES
    AS A PERCENTAGE OF CUT-OFF DATE AGGREGATE PRINCIPAL BALANCE (CONTINUED)
<TABLE>
<CAPTION>
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------  ----------------
                                     %                 %
<S>                    <C>               <C>
December 2004........     11.82748198       39.47684017
January 2005.........     11.54255702       39.05432138
February 2005........     11.26435631       38.63584551
March 2005...........     10.99272325       38.22137492
April 2005...........     10.72750489       37.81087236
May 2005.............     10.46855178       37.40430090
June 2005............     10.21571794       37.00162394
July 2005............      9.96886073       36.60280526
August 2005..........      9.72784085       36.20780892
September 2005.......      9.49252218       35.81659936
October 2005.........      9.26277176       35.42914131
November 2005........      9.03845969       35.04539986
December 2005........      8.81945909       34.66534040
January 2006.........      8.60564600       34.28892865
February 2006........      8.39689932       33.91613063
March 2006...........      8.19310077       33.54691269
April 2006...........      7.99413477       33.18124149
May 2006.............      7.79988845       32.81908399
June 2006............      7.61025153       32.46040747
July 2006............      7.42511629       32.10517949
August 2006..........      7.24437749       31.75336792
September 2006.......      7.06793233       31.40494094
October 2006.........      6.89568040       31.05986701
November 2006........      6.72752360       30.71811487
December 2006........      6.56336611       30.37965357
January 2007.........      6.40311432       30.04445244
February 2007........      6.24667680       29.71248109
March 2007...........      6.09396422       29.38370941
April 2007...........      5.94488934       29.05810756
May 2007.............      5.79936693       28.73564601
June 2007............      5.65731373       28.41629546
July 2007............      5.51864843       28.10002690
August 2007..........      5.38329158       27.78681159
September 2007.......      5.25116558       27.47662105
October 2007.........      5.12219465       27.16942707
November 2007........      4.99630473       26.86520169
December 2007........      4.87342352       26.56391722
January 2008.........      4.75348036       26.26554622
February 2008........      4.63640625       25.97006151
March 2008...........      4.52213379       25.67743614
April 2008...........      4.41059715       25.38764343
May 2008.............      4.30173200       25.10065694
June 2008............      4.19547555       24.81645048
July 2008............      4.09176644       24.53499809
August 2008..........      3.99054472       24.25627406
September 2008.......      3.89175187       23.98025292
October 2008.........      3.79533071       23.70690942
November 2008........      3.70122539       23.43621856
December 2008........      3.60938136       23.16815555
January 2009.........      3.51974534       22.90269587
February 2009........      3.43226529       22.63981517
March 2009...........      3.34689038       22.37948938
April 2009...........      3.26357096       22.12169461
May 2009.............      3.18225855       21.86640722
June 2009............      3.10290577       21.61360377
July 2009............      3.02546637       21.36326104
August 2009..........      2.94989516       21.11535603
September 2009.......      2.87614802       20.86986596
October 2009.........      2.80418183       20.62676824
November 2009........      2.73395452       20.38604051
December 2009........      2.66542495       20.14766060
<CAPTION>
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------  ----------------
<S>                    <C>               <C>
                                     %                 %
January 2010.........      2.59855298       19.91160655
February 2010........      2.53329938       19.67785661
March 2010...........      2.46962584       19.44638922
April 2010...........      2.40749496       19.21718303
May 2010.............      2.34687019       18.99021688
June 2010............      2.28771584       18.76546982
July 2010............      2.22999708       18.54292106
August 2010..........      2.17367985       18.32255004
September 2010.......      2.11873091       18.10433637
October 2010.........      2.06511779       17.88825986
November 2010........      2.01280880       17.67430049
December 2010........      1.96177295       17.46243844
January 2011.........      1.91198001       17.25265406
February 2011........      1.86340044       17.04492790
March 2011...........      1.81600539       16.83924068
April 2011...........      1.76976670       16.63557329
May 2011.............      1.72465685       16.43390681
June 2011............      1.68064898       16.23422249
July 2011............      1.63771685       16.03650176
August 2011..........      1.59583484       15.84072620
September 2011.......      1.55497792       15.64687758
October 2011.........      1.51512166       15.45493785
November 2011........      1.47624219       15.26488909
December 2011........      1.43831622       15.07671358
January 2012.........      1.40132098       14.89039375
February 2012........      1.36523424       14.70591219
March 2012...........      1.33003432       14.52325166
April 2012...........      1.29570000       14.34239507
May 2012.............      1.26221061       14.16332549
June 2012............      1.22954593       13.98602615
July 2012............      1.19768622       13.81048044
August 2012..........      1.16661222       13.63667189
September 2012.......      1.13630511       13.46458420
October 2012.........      1.10674651       13.29420120
November 2012........      1.07791847       13.12550690
December 2012........      1.04980349       12.95848541
January 2013.........      1.02238445       12.79312105
February 2013........      0.99564464       12.62939822
March 2013...........      0.96956775       12.46730152
April 2013...........      0.94413785       12.30681565
May 2013.............      0.91933940       12.14792548
June 2013............      0.89515719       11.99061601
July 2013............      0.87157642       11.83487238
August 2013..........      0.84858259       11.68067986
September 2013.......      0.82616156       11.52802387
October 2013.........      0.80429955       11.37688995
November 2013........      0.78298306       11.22726379
December 2013........      0.76219894       11.07913120
January 2014.........      0.74193434       10.93247812
February 2014........      0.72217671       10.78729064
March 2014...........      0.70291381       10.64355496
April 2014...........      0.68413368       10.50125741
May 2014.............      0.66582464       10.36038444
June 2014............      0.64797528       10.22092265
July 2014............      0.63057449       10.08285875
August 2014..........      0.61361140        9.94617956
September 2014.......      0.59707539        9.81087204
October 2014.........      0.58095610        9.67692326
November 2014........      0.56524344        9.54432042
December 2014........      0.54992751        9.41305084
January 2015.........      0.53499869        9.28310194
</TABLE>
 
                                      S-53
<PAGE>
                               TARGETED BALANCES
    AS A PERCENTAGE OF CUT-OFF DATE AGGREGATE PRINCIPAL BALANCE (CONTINUED)
<TABLE>
<CAPTION>
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------  ----------------
                                     %                 %
<S>                    <C>               <C>
February 2015........      0.52044757        9.15446128
March 2015...........      0.50626495        9.02711650
April 2015...........      0.49244187        8.90105540
May 2015.............      0.47896958        8.77626586
June 2015............      0.46583953        8.65273589
July 2015............      0.45304337        8.53045359
August 2015..........      0.44057296        8.40940720
September 2015.......      0.42842034        8.28958504
October 2015.........      0.41657776        8.17097556
November 2015........      0.40503763        8.05356731
December 2015........      0.39379257        7.93734894
January 2016.........      0.38283534        7.82230921
February 2016........      0.37215890        7.70843698
March 2016...........      0.36175637        7.59572123
April 2016...........      0.35162103        7.48415101
May 2016.............      0.34174633        7.37371552
June 2016............      0.33215995        7.26513969
July 2016............      0.32282023        7.15766837
August 2016..........      0.31372112        7.05129112
September 2016.......      0.30485669        6.94599759
October 2016.........      0.29622118        6.84177754
November 2016........      0.28780896        6.73862080
December 2016........      0.27961451        6.63651732
January 2017.........      0.27163248        6.53545713
February 2017........      0.26385763        6.43543035
March 2017...........      0.25628484        6.33642721
April 2017...........      0.24890912        6.23843800
May 2017.............      0.24172560        6.14145312
June 2017............      0.23472952        6.04546306
July 2017............      0.22791624        5.95045840
August 2017..........      0.22128124        5.85642980
September 2017.......      0.21482008        5.76336800
October 2017.........      0.20852847        5.67126384
November 2017........      0.20240218        5.58010824
December 2017........      0.19643711        5.48989220
January 2018.........      0.19062925        5.40060681
February 2018........      0.18497468        5.31224325
March 2018...........      0.17946959        5.22479275
April 2018...........      0.17411024        5.13824666
May 2018.............      0.16889299        5.05259639
June 2018............      0.16381431        4.96783344
July 2018............      0.15887072        4.88394937
August 2018..........      0.15405885        4.80093583
September 2018.......      0.14937538        4.71878456
October 2018.........      0.14481712        4.63748736
November 2018........      0.14038091        4.55703611
December 2018........      0.13606368        4.47742276
January 2019.........      0.13186246        4.39863935
February 2019........      0.12777431        4.32067799
March 2019...........      0.12379639        4.24353085
April 2019...........      0.11992593        4.16719018
May 2019.............      0.11616021        4.09164831
June 2019............      0.11249658        4.01689763
July 2019............      0.10893247        3.94293061
August 2019..........      0.10546536        3.86973978
September 2019.......      0.10209278        3.79731775
October 2019.........      0.09881235        3.72565718
November 2019........      0.09562172        3.65475083
December 2019........      0.09251861        3.58459150
January 2020.........      0.08950388        3.51531609
February 2020........      0.08657215        3.44677179
<CAPTION>
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------  ----------------
<S>                    <C>               <C>
                                     %                 %
March 2020...........      0.08372131        3.37895162
April 2020...........      0.08094929        3.31184866
May 2020.............      0.07825409        3.24545608
June 2020............      0.07563373        3.17976708
July 2020............      0.07308629        3.11477496
August 2020..........      0.07060992        3.05047305
September 2020.......      0.06820279        2.98685476
October 2020.........      0.06586311        2.92391355
November 2020........      0.06358916        2.86164295
December 2020........      0.06137924        2.80003656
January 2021.........      0.05923170        2.73908801
February 2021........      0.05714493        2.67879102
March 2021...........      0.05511736        2.61913934
April 2021...........      0.05314746        2.56012680
May 2021.............      0.05123373        2.50174729
June 2021............      0.04937472        2.44399473
July 2021............      0.04756901        2.38686313
August 2021..........      0.04581520        2.33034652
September 2021.......      0.04411195        2.27443902
October 2021.........      0.04246352        2.21948101
November 2021........      0.04086283        2.16511643
December 2021........      0.03930862        2.11133957
January 2022.........      0.03779969        2.05814480
February 2022........      0.03633484        2.00552654
March 2022...........      0.03491292        1.95347924
April 2022...........      0.03353281        1.90199743
May 2022.............      0.03219339        1.85107567
June 2022............      0.03089360        1.80070859
July 2022............      0.02963240        1.75089085
August 2022..........      0.02840875        1.70161716
September 2022.......      0.02722167        1.65288230
October 2022.........      0.02607019        1.60468109
November 2022........      0.02495336        1.55700838
December 2022........      0.02387025        1.50985908
January 2023.........      0.02281998        1.46322817
February 2023........      0.02180166        1.41711065
March 2023...........      0.02081444        1.37150156
April 2023...........      0.01985748        1.32639601
May 2023.............      0.01892998        1.28178915
June 2023............      0.01803114        1.23767616
July 2023............      0.01716019        1.19405228
August 2023..........      0.01631637        1.15091279
September 2023.......      0.01549897        1.10825302
October 2023.........      0.01470725        1.06606832
November 2023........      0.01394053        1.02435411
December 2023........      0.01319812        0.98310585
January 2024.........      0.01247936        0.94231903
February 2024........      0.01178360        0.90198919
March 2024...........      0.01111023        0.86211191
April 2024...........      0.01045862        0.82268280
May 2024.............      0.00982818        0.78369754
June 2024............      0.00921833        0.74515181
July 2024............      0.00862849        0.70704137
August 2024..........      0.00805812        0.66936200
September 2024.......      0.00750667        0.63210952
October 2024.........      0.00697363        0.59527978
November 2024........      0.00645848        0.55886869
December 2024........      0.00596072        0.52287219
January 2025.........      0.00547987        0.48728625
February 2025........      0.00501545        0.45210688
March 2025...........      0.00456700        0.41733013
</TABLE>
 
                                      S-54
<PAGE>
                               TARGETED BALANCES
    AS A PERCENTAGE OF CUT-OFF DATE AGGREGATE PRINCIPAL BALANCE (CONTINUED)
<TABLE>
<CAPTION>
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------  ----------------
                                     %                 %
<S>                    <C>               <C>
April 2025...........      0.00413408        0.38295209
May 2025.............      0.00371624        0.34896889
June 2025............      0.00331306        0.31537668
July 2025............      0.00292412        0.28217167
August 2025..........      0.00254903        0.24935007
September 2025.......      0.00218738        0.21690816
October 2025.........      0.00183879        0.18484224
November 2025........      0.00150290        0.15314865
December 2025........      0.00117932        0.12182375
<CAPTION>
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------  ----------------
<S>                    <C>               <C>
                                     %                 %
January 2026.........      0.00086771        0.09086395
February 2026........      0.00056773        0.06026569
March 2026...........      0.00027903        0.03002544
April 2026...........      0.00000130        0.00013971
May 2026.............      0.00000006        0.00000658
June 2026............      0.00000003        0.00000327
July 2026
 and thereafter......      0.00000000        0.00000000
</TABLE>
 
    The  following tables  set forth  for each  Distribution Date  the scheduled
Class  A  Subclass  Principal  Balance  for  each  Subclass  of  the   Scheduled
Certificates  and the  Scheduled Component Principal  Balance of  each Class A-6
Component and the Class A-7 Accrual Component, each expressed as a percentage of
the initial Class A Subclass  Principal Balance or Component Principal  Balance,
as the case may be.
                 SCHEDULED CLASS A SUBCLASS PRINCIPAL BALANCES
        AS PERCENTAGE OF THE INITIAL CLASS A SUBCLASS PRINCIPAL BALANCE
 
                             CLASS A-1 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
                       ----------------%
                          98.23882317
DISTRIBUTION DATE         96.26034158
- ---------------------     94.06508247
                          91.65368555
August 1996..........     89.02690300
September 1996.......     86.18559904
October 1996.........     83.13074981
November 1996........     79.86344272
December 1996........     76.38487616
January 1997.........   PERCENTAGE OF
February 1997........  INITIAL CLASS A
March 1997...........      SUBCLASS
April 1997...........     PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
May 1997.............     72.69635869
June 1997............     68.79930842
July 1997............     64.69525213
August 1997..........     60.38582446
September 1997.......     55.87276682
October 1997.........     51.15792631
November 1997........     46.24325462
December 1997........     41.13080657
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
January 1998.........     35.82273892
February 1998........     30.32130880
March 1998...........     24.62887219
April 1998...........     18.74788223
May 1998.............     12.68088769
June 1998............      6.43053081
July 1998
 and thereafter......      0.00000000
</TABLE>
 
                             CLASS A-2 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
    DISTRIBUTION       ----------------%
        DATE
- ---------------------    100.00000000
                          99.99939835
Up to and including       91.24534621
June 1998............     82.25963014
July 1998............     73.04622041
August 1998..........   PERCENTAGE OF
September 1998.......  INITIAL CLASS A
October 1998.........      SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
November 1998........     63.87630604
December 1998........     54.75262783
January 1999.........     45.67495188
February 1999........     36.64307233
March 1999...........     27.65675739
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
April 1999...........     18.71577672
May 1999.............      9.81990107
June 1999............      0.96890243
July 1999
 and thereafter......      0.00000000
</TABLE>
 
                                      S-55
<PAGE>
                 SCHEDULED CLASS A SUBCLASS PRINCIPAL BALANCES
  AS PERCENTAGE OF THE INITIAL CLASS A SUBCLASS PRINCIPAL BALANCE (CONTINUED)
 
                             CLASS A-3 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
    DISTRIBUTION       ----------------%
        DATE
- ---------------------    100.00000000
                          92.94828933
Up to and including       85.06478352
June 1999............     77.22104676
July 1999............     69.41687819
August 1999..........   PERCENTAGE OF
September 1999.......  INITIAL CLASS A
October 1999.........      SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
November 1999........     61.65207820
December 1999........     53.92644801
January 2000.........     46.23979010
February 2000........     38.59190790
March 2000...........     30.98260591
April 2000...........     23.41168969
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
May 2000.............     15.87896583
June 2000............      8.38424196
July 2000............      0.92732674
August 2000
 and thereafter......      0.00000000
</TABLE>
 
                             CLASS A-4 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
    DISTRIBUTION       ----------------%
        DATE
- ---------------------    100.00000000
                          91.61218477
Up to and including       82.07459569
July 2000............     72.58512272
August 2000..........   PERCENTAGE OF
September 2000.......  INITIAL CLASS A
October 2000.........      SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
November 2000........     63.14352399
December 2000........     53.74955880
January 2001.........     44.40298777
February 2001........     35.10357282
March 2001...........     25.85107717
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
April 2001...........     16.64526533
May 2001.............      7.48590299
June 2001
 and thereafter......      0.00000000
</TABLE>
 
                             CLASS A-5 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
    DISTRIBUTION       ----------------%
        DATE
- ---------------------    100.00000000
                          99.25369487
Up to and including       95.09520741
May 2001.............     91.03876449
June 2001............     87.00289715
July 2001............     82.98749966
August 2001..........     78.99246682
September 2001.......     75.01769400
October 2001.........     71.06307710
November 2001........   PERCENTAGE OF
December 2001........  INITIAL CLASS A
January 2002.........      SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
February 2002........     67.12851261
March 2002...........     63.21389749
April 2002...........     59.31912930
May 2002.............     55.44410609
June 2002............     51.58872650
July 2002............     47.75288965
August 2002..........     43.96265521
September 2002.......     40.19160600
October 2002.........     36.43964269
November 2002........     32.70666650
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
December 2002........     28.99257918
January 2003.........     25.29728292
February 2003........     21.62068048
March 2003...........     17.96267512
April 2003...........     14.32317060
May 2003.............     10.70207117
June 2003............      7.09928162
July 2003............      3.51470716
August 2003
 and thereafter......      0.00000000
</TABLE>
 
                                      S-56
<PAGE>
                     SCHEDULED COMPONENT PRINCIPAL BALANCES
              AS PERCENTAGE OF INITIAL COMPONENT PRINCIPAL BALANCE
 
                        CLASS A-6 A SCHEDULED COMPONENT
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
                          PRINCIPAL
                           BALANCE
                       ----------------%
    DISTRIBUTION
        DATE              98.23882317
- ---------------------     96.26034158
                          94.06508247
August 1996..........     91.65368555
September 1996.......     89.02690300
October 1996.........     86.18559904
November 1996........     83.13074981
December 1996........     79.86344272
January 1997.........     76.38487616
February 1997........   PERCENTAGE OF
March 1997...........      INITIAL
April 1997...........     COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
May 1997.............     72.69635869
June 1997............     68.79930842
July 1997............     64.69525213
August 1997..........     60.38582446
September 1997.......     55.87276682
October 1997.........     51.15792631
November 1997........     46.24325462
December 1997........     41.13080657
 
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
January 1998.........     35.82273892
February 1998........     30.32130880
March 1998...........     24.62887219
April 1998...........     18.74788223
May 1998.............     12.68088769
June 1998............      6.43053081
July 1998
 and thereafter......      0.00000000
</TABLE>
 
                        CLASS A-6 B SCHEDULED COMPONENT
                                   SCHEDULE I
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
                          PRINCIPAL
                           BALANCE
                       ----------------%
    DISTRIBUTION
        DATE              99.69244414
- ---------------------     99.31407109
                          98.86510999
August 1996..........     98.34587258
September 1996.......     97.75675295
October 1996.........     97.09822764
November 1996........     96.37085511
December 1996........     95.57527567
January 1997.........     94.71221056
February 1997........     93.78246170
March 1997...........     92.78691075
April 1997...........     91.72651816
May 1997.............     90.60232236
June 1997............     89.41543863
July 1997............     88.16705775
August 1997..........     86.85844475
September 1997.......     85.49093739
October 1997.........     84.06594479
November 1997........     82.58494552
December 1997........     81.04948593
January 1998.........     79.46117824
February 1998........     77.82169860
March 1998...........     76.13278496
April 1998...........     74.39623492
May 1998.............     72.61390339
June 1998............     70.78770036
July 1998............     68.91958830
August 1998..........     67.07707019
September 1998.......     65.26065888
October 1998.........   PERCENTAGE OF
November 1998........      INITIAL
December 1998........     COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
January 1999.........     63.47012708
February 1999........     61.70525566
March 1999...........     59.96582077
April 1999...........     58.25160009
May 1999.............     56.56237331
June 1999............     54.89792164
July 1999............     53.25802819
August 1999..........     51.64247767
September 1999.......     50.05105663
October 1999.........     48.48355315
November 1999........     46.93975708
December 1999........     45.41945998
January 2000.........     43.92245499
February 2000........     42.44853692
March 2000...........     40.99750228
April 2000...........     39.56914902
May 2000.............     38.16327696
June 2000............     36.77968724
July 2000............     35.41818280
August 2000..........     34.07856804
September 2000.......     32.76064894
October 2000.........     31.46423307
November 2000........     30.18912949
December 2000........     28.93514881
January 2001.........     27.70210315
February 2001........     26.48980614
March 2001...........     25.29807290
April 2001...........     24.12671998
May 2001.............     22.97556550
 
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
June 2001............     21.84442900
July 2001............     20.73313142
August 2001..........     19.68113284
September 2001.......     18.64839414
October 2001.........     17.63474047
November 2001........     16.63999841
December 2001........     15.66399604
January 2002.........     14.70656270
February 2002........     13.76752913
March 2002...........     12.84672752
April 2002...........     11.94399131
May 2002.............     11.05915526
June 2002............     10.19205556
July 2002............      9.34252961
August 2002..........      8.52291032
September 2002.......      7.72041084
October 2002.........      6.93487314
November 2002........      6.16614037
December 2002........      5.41405698
January 2003.........      4.67846872
February 2003........      3.95922252
March 2003...........      3.25616667
April 2003...........      2.56915053
May 2003.............      1.89802479
June 2003............      1.24264136
July 2003............      0.60285326
August 2003
 and thereafter......      0.00000000
</TABLE>
 
                        CLASS A-6 B SCHEDULED COMPONENT
                                  SCHEDULE II
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
                          PRINCIPAL
                           BALANCE
    DISTRIBUTION       ----------------%
        DATE
- ---------------------     100.0000000
                          99.99722128
Up to and including       93.39548352
July 2003............     86.82684852
August 2003..........     80.29114253
September 2003.......     73.78819266
October 2003.........   PERCENTAGE OF
November 2003........      INITIAL
December 2003........     COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
January 2004.........     67.31782705
February 2004........     60.87987460
March 2004...........     54.47416516
April 2004...........     48.10052943
May 2004.............     41.75879908
June 2004............     35.44880652
 
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
July 2004............     29.17038515
August 2004..........     23.01326762
September 2004.......     16.88648081
October 2004.........     10.78986436
November 2004........      4.72325876
December 2004........      0.00000000
</TABLE>
 
                                      S-57
<PAGE>
                     SCHEDULED COMPONENT PRINCIPAL BALANCES
        AS PERCENTAGE OF INITIAL COMPONENT PRINCIPAL BALANCE (CONTINUED)
 
                          CLASS A-7 ACCRUAL COMPONENT
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
                          PRINCIPAL
                           BALANCE
                       ----------------%
    DISTRIBUTION
        DATE              99.89747921
- ---------------------     99.77139690
                          99.62183676
August 1996..........     99.44891897
September 1996.......     99.25280021
October 1996.........     99.03367359
November 1996........     98.79176860
December 1996........     98.52735082
January 1997.........     98.24072174
February 1997........     97.93221840
March 1997...........     97.60221294
April 1997...........     97.25111220
May 1997.............     96.87935714
June 1997............     96.48742220
July 1997............     96.07581467
August 1997..........     95.64507390
September 1997.......     95.19577049
October 1997.........     94.72850542
November 1997........     94.24390912
December 1997........     93.74264040
January 1998.........     93.22538544
February 1998........     92.69285666
March 1998...........     92.14579152
April 1998...........     91.58495129
May 1998.............     91.01111976
June 1998............     90.42510194
July 1998............     89.82772264
August 1998..........     89.24123889
September 1998.......     88.66575923
October 1998.........     88.10114845
November 1998........     87.54727496
December 1998........     87.00400638
January 1999.........     86.47121174
February 1999........     85.94876153
March 1999...........     85.43652761
April 1999...........     84.93438323
May 1999.............     84.44220302
June 1999............     83.95986296
July 1999............     83.48724040
August 1999..........     83.02421399
September 1999.......     82.57066373
October 1999.........     82.12647090
November 1999........     81.69151808
December 1999........     81.26568912
January 2000.........     80.84886916
February 2000........     80.44094456
March 2000...........     80.04180296
April 2000...........     79.65133318
May 2000.............     79.26942529
June 2000............     78.89597053
July 2000............     78.53086138
August 2000..........     78.17399145
September 2000.......     77.82525554
October 2000.........     77.48454959
November 2000........     77.15177070
December 2000........     76.82681707
January 2001.........   PERCENTAGE OF
February 2001........      INITIAL
March 2001...........     COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
April 2001...........     76.50958805
May 2001.............     76.19998409
June 2001............     75.89790671
July 2001............     75.60325856
August 2001..........     75.32939897
September 2001.......     75.06268419
October 2001.........     74.80302018
November 2001........     74.55031394
December 2001........     74.30447347
January 2002.........     74.06540782
February 2002........     73.83302704
March 2002...........     73.60724217
April 2002...........     73.38796524
May 2002.............     73.17510925
June 2002............     72.96858818
July 2002............     72.76831696
August 2002..........     72.57839035
September 2002.......     72.39448970
October 2002.........     72.21653314
November 2002........     72.04443968
December 2002........     71.87812925
January 2003.........     71.71752266
February 2003........     71.56254163
March 2003...........     71.41310874
April 2003...........     71.26914746
May 2003.............     71.13058210
June 2003............     70.99733784
July 2003............     70.86934069
August 2003..........     70.75396938
September 2003.......     69.45080421
October 2003.........     68.16048126
November 2003........     66.88287920
December 2003........     65.61787783
January 2004.........     64.36535805
February 2004........     63.12520189
March 2004...........     61.89729247
April 2004...........     60.68151401
May 2004.............     59.47775180
June 2004............     58.28589219
July 2004............     57.10582262
August 2004..........     55.96248302
September 2004.......     54.83031580
October 2004.........     53.70921532
November 2004........     52.59907694
December 2004........     51.49979698
January 2005.........     50.41127276
February 2005........     49.33340252
March 2005...........     48.26608550
April 2005...........     47.20922182
May 2005.............     46.16271260
June 2005............     45.12645983
July 2005............     44.10036645
August 2005..........     43.10684421
September 2005.......     42.12284501
October 2005.........     41.14828021
November 2005........     40.18306198
 
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
December 2005........     39.22710331
January 2006.........     38.28031798
February 2006........     37.34262057
March 2006...........     36.41392647
April 2006...........     35.49415182
May 2006.............     34.58321354
June 2006............     33.68102935
July 2006............     32.78751770
August 2006..........     31.90259778
September 2006.......     31.02618957
October 2006.........     30.15821375
November 2006........     29.29859175
December 2006........     28.44724572
January 2007.........     27.60409852
February 2007........     26.76907376
March 2007...........     25.94209571
April 2007...........     25.12308937
May 2007.............     24.31198040
June 2007............     23.50869520
July 2007............     22.71316080
August 2007..........     21.92530492
September 2007.......     21.14505595
October 2007.........     20.37234295
November 2007........     19.60709562
December 2007........     18.84924432
January 2008.........     18.09872006
February 2008........     17.35545445
March 2008...........     16.61937978
April 2008...........     15.89042893
May 2008.............     15.16853543
June 2008............     14.45363341
July 2008............     13.74565759
August 2008..........     13.04454333
September 2008.......     12.35022655
October 2008.........     11.66264378
November 2008........     10.98173216
December 2008........     10.30742936
January 2009.........      9.63967368
February 2009........      8.97840395
March 2009...........      8.32355957
April 2009...........      7.67508052
May 2009.............      7.03290733
June 2009............      6.39698107
July 2009............      5.76724335
August 2009..........      5.14363633
September 2009.......      4.52610271
October 2009.........      3.91458571
November 2009........      3.30902907
December 2009........      2.70937708
January 2010.........      2.11557449
February 2010........      1.52756662
March 2010...........      0.94529926
April 2010...........      0.36871871
May 2010
 and thereafter......      0.00000000
</TABLE>
 
                                      S-58
<PAGE>
DISTRIBUTIONS IN REDUCTION OF THE CLASS A SUBCLASS PRINCIPAL BALANCE OF THE
CLASS A-17 CERTIFICATES
 
    GENERAL.    As to  distributions of  principal among  holders of  Class A-17
Certificates, Deceased Holders((1)) of such  Subclass will be entitled to  first
priority  and  Beneficial  Owners  other  than  Deceased  Holders  (the  "Living
Holders") of such  Subclass will be  entitled to a  second priority.  Beneficial
Owners   of  the  Class  A-17  Certificates  have  the  right  to  request  that
distributions in reduction of  principal balance be made  with respect to  their
Certificates  on each Distribution  Date on which  distributions in reduction of
the Class A Subclass Principal Balance are  made with respect to the Class  A-17
Certificates. All such requested distributions with respect to such Subclass are
subject  to  the  priorities described  below  under "--  Priority  of Requested
Distributions" and are further subject to the limitations that they be made  (i)
only  in lots equal to integral multiples of $1,000 of initial principal balance
(each $1,000 initial principal balance, an "Individual Class A-17  Certificate")
and  (ii)  only  to  the  extent  that the  portion  of  the  Class  A Principal
Distribution Amount allocated  to such Subclass  on the applicable  Distribution
Date  (plus any amounts  available from the Rounding  Account for such Subclass)
provides sufficient funds for such  requested distributions. To the extent  that
amounts  available for distributions  in respect of principal  of the Class A-17
Certificates on any Distribution Date exceed the aggregate requests by  Deceased
Holders  and  Living  Holders  for principal  distributions  applicable  to such
Distribution Date, such  excess amounts  will be distributed  to the  Beneficial
Owners  of Class A-17 Certificates  by random lot, as  described below under "--
Mandatory Distributions of Principal on Class A-17 Certificates."
 
    On each Distribution Date on  which amounts are available for  distributions
in  reduction  of the  principal  balance of  the  Class A-17  Certificates, the
aggregate amount allocable to such distributions will be rounded, as  necessary,
to  an amount equal to an integral multiple of $1,000, except as provided below,
in accordance  with  the  priorities  and limitations  set  forth  herein.  Such
rounding   will  be  accomplished  on  the  first  Distribution  Date  on  which
distributions  in  reduction  of  the  principal  balance  of  the  Class   A-17
Certificates  are made by withdrawing, from a non-interest bearing account to be
established on the  Closing Date  for such Subclass  with a  $999.99 deposit  by
Lehman Brothers (the "Rounding Account"), the amount of funds, if any, needed to
round  the amount otherwise available for such distribution with respect to such
Subclass upward  to  the  next  higher integral  multiple  of  $1,000.  On  each
succeeding  Distribution  Date  on  which  distributions  in  reduction  of  the
principal balance of the Class A-17  Certificates are to be made, the  aggregate
amount  allocable to  such Subclass  will be  applied first  to repay  any funds
withdrawn from the Rounding Account on the prior Distribution Date, and then the
remainder  of  such  allocable  amount,  if  any,  will  be  similarly   rounded
 
- ------------------------
((1)) A  "Deceased Holder" is a Beneficial Owner of a Class A-17 Certificate who
      was living at the  time such interest was  acquired and whose executor  or
      other  authorized representative causes to be furnished to DTC evidence of
      death  satisfactory  to  the  Trust  Administrator  and  any  tax  waivers
      requested by the Trust Administrator. Class A-17 Certificates beneficially
      owned  by tenants by the entirety, joint tenants or tenants in common will
      be considered to be beneficially owned by  a single owner. The death of  a
      tenant by the entirety, joint tenant or tenant in common will be deemed to
      be  the death of the Beneficial Owner,  and the Class A-17 Certificates so
      beneficially  owned  will  be  eligible  for  priority  with  respect   to
      distributions   in  reduction   of  principal  balance,   subject  to  the
      limitations stated herein. The Class A-17 Certificates beneficially  owned
      by a trust will be considered to be beneficially owned by each beneficiary
      of  the  trust to  the extent  of  such beneficiary's  beneficial interest
      therein, but  in no  event will  a trust's  beneficiaries collectively  be
      deemed  to  be Beneficial  Owners  of a  number  of Individual  Class A-17
      Certificates greater than the number of Individual Class A-17 Certificates
      of which such trust is  the owner. The death of  a beneficiary of a  trust
      will  be deemed to  be the death of  a Beneficial Owner  of the Class A-17
      Certificates beneficially  owned  by  the  trust to  the  extent  of  such
      beneficiary's   beneficial  interest  in  such  trust.  The  death  of  an
      individual who was  a tenant by  the entirety, joint  tenant or tenant  in
      common  in a tenancy which is the beneficiary of a trust will be deemed to
      be the death of the beneficiary of  the trust. The death of a person  who,
      during  his  or her  lifetime, was  entitled to  substantially all  of the
      beneficial ownership interests in Class  A-17 Certificates will be  deemed
      to be the death of the Beneficial Owner of such Certificates regardless of
      the  registration  of  ownership,  if  such  beneficial  interest  can  be
      established  to  the  satisfaction   of  the  Trust  Administrator.   Such
      beneficial  interest will  be deemed to  exist in typical  cases of street
      name or nominee  ownership, ownership  by a trustee,  ownership under  the
      Uniform  Gifts  to  Minors  Act  and  community  property  or  other joint
      ownership arrangements  between a  husband and  wife. Beneficial  interest
      shall  include the power to sell, transfer or otherwise dispose of a Class
      A-17 Certificate and the right to receive the proceeds therefrom, as  well
      as  interest and distributions  in reduction of  principal balance payable
      with respect thereto. As used in this Prospectus Supplement, a request for
      a distribution  in reduction  of the  principal balance  of a  Class  A-17
      Certificate  by a  Deceased Holder  shall mean  a request  by the personal
      representative, surviving tenant by  the entirety, surviving joint  tenant
      or a surviving tenant in common of the Deceased Holder.
 
                                      S-59
<PAGE>
upward  through another withdrawal from the  Rounding Account and distributed in
reduction of the principal balance of such Subclass. This process will  continue
on  succeeding Distribution Dates until the outstanding principal balance of the
Class  A-17  Certificates  has  been  reduced  to  zero.  Thus,  the   aggregate
distribution  made  in reduction  of  the principal  balance  of the  Class A-17
Certificates on each Distribution Date may  be slightly more or less than  would
be the case in the absence of such rounding procedures, but such difference will
be  no more than $999.99  for such Subclass on  such Distribution Date. Under no
circumstances will  the  sum of  all  distributions  made in  reduction  of  the
principal balance of the Class A-17 Certificates, through any Distribution Date,
be  less than the sum for such Subclass  that would have resulted in the absence
of such rounding procedures.
 
    There is no assurance  that a Beneficial Owner  of a Class A-17  Certificate
who has submitted a request for such distribution will receive such distribution
at  any particular time after such distribution is requested, since there can be
no assurance that funds will be  available for making such distributions on  any
particular  Distribution Date, or,  even if funds are  available for making such
distributions in reduction  of the Class  A Subclass Principal  Balance of  such
Subclass,  that such distributions with respect to Class A-17 Certificates owned
by any particular Beneficial Owner will be made. Also, due to the procedure  for
mandatory  distributions described below, there can  be no assurance that on any
Distribution Date on which  the funds available for  distribution in respect  of
principal  of  the  Class  A-17  Certificates  exceed  the  aggregate  amount of
distributions requested by  Beneficial Owners  of Class  A-17 Certificates,  any
particular  Beneficial  Owner will  receive a  principal distribution  from such
excess funds. Thus, the  timing of distributions in  reduction of the  principal
balance  with  respect  to  any  particular  Class  A-17  Certificate  is highly
uncertain and may be made earlier or later than the date that may be desired  by
a Beneficial Owner of such Certificate.
 
    Notwithstanding  any provisions herein to the contrary, on each Distribution
Date following the  first Distribution Date  on which any  principal losses  are
allocated  to the Class A Certificateholders  occurring on or after the earliest
to occur of  (i) the  Cross-Over Date,  (ii) the  date on  which Special  Hazard
Losses  exceed the  Special Hazard  Loss Amount, (iii)  the date  on which Fraud
Losses exceed the Fraud Loss Amount and (iv) the date on which Bankruptcy Losses
exceed the Bankruptcy Loss Amount,  distributions in reduction of the  principal
balance  of the  Class A-17 Certificates  (including amounts paid  in respect of
such losses under the Policy) will be  made pro rata among the holders of  Class
A-17  Certificates  and will  not be  made  in integral  multiples of  $1,000 or
pursuant to requested distributions or mandatory distributions by random lot.
 
    PRIORITY OF REQUESTED DISTRIBUTIONS.   Subject to the limitations  described
herein,  including the order of the receipt  of the request for distributions as
described below  under "--  Procedure for  Requested Distributions."  Beneficial
Owners   of  the  Class  A-17  Certificates  have  the  right  to  request  that
distributions  be  made  in  reduction  of  the  principal  balances  of   their
Certificates.  On each Distribution Date on  which distributions in reduction of
the Class A Subclass Principal Balance of the Class A-17 Certificates are  made,
such  distributions will  be made  in the following  order of  priority: (i) any
request by a Deceased Holder, in an amount up to but not exceeding an  aggregate
principal  balance of  $100,000 per  request; and (ii)  any request  by a Living
Holder, in an amount up to but  not exceeding an aggregate principal balance  of
$10,000  per  request. Thereafter,  distributions will  be  made as  provided in
clauses (i) and (ii)  above up to a  second $100,000 and $10,000,  respectively.
This  sequence of  priorities will  be repeated  for each  request for principal
distributions made by the Beneficial Owners of Class A-17 Certificates until all
such requests have been honored.
 
    PROCEDURE FOR REQUESTED DISTRIBUTIONS.  A Beneficial Owner may request  that
distributions   in  reduction  of  the  principal  balance  of  its  Class  A-17
Certificates be made  on a  Distribution Date  by delivering  a written  request
therefor,  to the Participant or Indirect Participant that maintains its account
in the Class A-17  Certificates such that the  request for such distribution  is
received  by  the Trust  Administrator on  or  before the  Record Date  for such
Distribution Date. In  the case of  a request  on behalf of  a Deceased  Holder,
appropriate  evidence of death and any tax  waivers are required to be forwarded
to the Trust Administrator under  separate cover. Furthermore, such requests  of
Deceased  Holders  which  are  incomplete  may  not  be  honored  by  the  Trust
Administrator. The Participant should
 
                                      S-60
<PAGE>
in turn make the  request of DTC  (or, in the case  of an Indirect  Participant,
such firm must notify the related Participant of such request, which Participant
should  make the request of DTC)  on a form required by  DTC and provided to the
Participant. Upon receipt  of such request,  DTC will date  and time stamp  such
request  and forward such request to  the Trust Administrator. DTC may establish
such procedures as it deems fair and equitable to establish the order of receipt
of requests for such distributions received by  it on the same day. Neither  the
Master Servicer, the Trustee nor the Trust Administrator shall be liable for any
delay  by DTC, any  Participant or any  Indirect Participant in  the delivery of
requests for distributions to the Trust Administrator. The Master Servicer  will
instruct  the  Trust Administrator  that requests  for  distributions are  to be
honored in  the order  of their  receipt (subject  to the  priorities  described
above).  The  exact procedures  to be  followed by  the Trust  Administrator for
purposes of determining  the order  of receipt of  such requests  will be  those
established  from time to time by the Trust Administrator, acting in conjunction
with DTC. Requests for distributions in reduction of principal balance  received
by  DTC and forwarded to the Trust  Administrator after the Record Date for such
Distribution Date and requests for distributions received in a timely manner but
not accepted  with respect  to a  given Distribution  Date, will  be treated  as
requests  for distributions  on the next  succeeding Distribution  Date and each
succeeding Distribution Date  thereafter until  each request is  accepted or  is
withdrawn as described below. Each request for distributions in reduction of the
principal balance of a Class A-17 Certificate submitted by a Beneficial Owner of
such  Certificate will be held by the Trust Administrator until such request has
been accepted  or has  been withdrawn  in writing.  Each Individual  Class  A-17
Certificate  Certificate covered by such request  will continue to bear interest
at the related Pass-Through Rate through  the Record Date for such  Distribution
Date.
 
    With  respect to Class A-17 Certificates  as to which Beneficial Owners have
requested distributions on a particular Distribution Date on which distributions
in reduction of  the Class  A Subclass Principal  Balance of  such Subclass  are
being made, DTC and its Participants will be notified prior to such Distribution
Date  whether, and the extent to which, such Certificates have been accepted for
distributions.  Participants  and  Indirect  Participants  holding  Class   A-17
Certificates  are required to  forward such notices to  the Beneficial Owners of
such Certificates. Individual Class A-17 Certificates or Certificates which have
been accepted  for a  distribution will  be due  and payable  on the  applicable
Distribution Date and will cease to bear interest after the Record Date for such
Distribution Date.
 
    Any  Beneficial  Owner of  a Class  A-17 Certificate  which has  requested a
distribution may withdraw its request by so notifying in writing the Participant
or Indirect Participant that maintains  such Beneficial Owner's account. In  the
event  that such account is maintained by an Indirect Participant, such Indirect
Participant must notify the related Participant  which in turn must forward  the
withdrawal   of  such  request,  on  a  form  required  by  DTC,  to  the  Trust
Administrator. If such notice  of withdrawal of a  request for distribution  has
not  been received by the  Trust Administrator on or  before the Record Date for
such Distribution Date,  the previously  made request for  distribution will  be
irrevocable  with respect  to the  making of  distributions in  reduction of the
principal balance of such Subclass on the applicable Distribution Date.
 
    MANDATORY DISTRIBUTIONS OF  PRINCIPAL ON  CLASS A-17 CERTIFICATES.   To  the
extent,  if  any,  that  distributions  in reduction  of  the  Class  A Subclass
Principal Balance of the Class A-17  Certificates on a Distribution Date  exceed
the  outstanding  principal  balance  of such  Subclass  with  respect  to which
distribution requests  have been  received by  the applicable  date,  additional
Class A-17 Certificates in lots equal to Individual Class A-17 Certificates will
be   selected  to  receive  principal   distributions  in  accordance  with  the
then-applicable  established   random   lot   procedures   of   DTC,   and   the
then-applicable   established  procedures  of   the  Participants  and  Indirect
Participants, which may  or may not  be by  random lot. Investors  may ask  such
Participants  or  Indirect  Participants what  allocation  procedures  they use.
Participants and Indirect Participants holding Class A-17 Certificates  selected
for  mandatory distributions in reduction of  the principal balance are required
to provide notice  of such  mandatory distributions to  the affected  Beneficial
Owners.
 
                                      S-61
<PAGE>
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 1996-1 Certificates,  after distributions in respect of  any
accrued  but  unpaid  interest  on  the  Series  1996-1  Certificates  and after
distributions in  reduction  of principal  balance  have reduced  the  principal
balances  of the Series 1996-1 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 1996-1 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 1996-1  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  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
Trust Administrator,  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 Trust
Administrator, 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  Trust Administrator,  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.
 
THE FINANCIAL GUARANTY INSURANCE POLICY
 
    The  following summary of the provisions of the financial guaranty insurance
policy covering the Class A-17 Certificates  to be issued by Financial  Security
(the  "Policy") does not purport to be complete and is qualified in its entirety
by reference to  the Policy,  a copy  of which may  be obtained  from the  Trust
Administrator upon request.
 
    Simultaneously   with  the  issuance  of  the  Series  1996-1  Certificates,
Financial Security will  deliver the Policy  to the Trustee  for the benefit  of
each  holder of  Class A-17 Certificates.  Under the  Policy, Financial Security
unconditionally and irrevocably  guarantees to  the Trustee for  the benefit  of
each  holder of Class A-17 Certificates the full and complete payment of (i) the
Class A Subclass Interest Accrual Amount determined without regard to clause (b)
of the definition thereof for such Subclass,
 
                                      S-62
<PAGE>
net of any Non-Supported Interest Shortfalls allocated to such Subclass that are
covered by the Reserve Fund and (ii)  any losses of principal allocated to  such
Subclass (clauses (i) and (ii) collectively, the "Guaranteed Distributions") and
(iii) the amount of any distribution of principal or interest to any holder of a
Class A-17 Certificate which distribution subsequently is avoided in whole or in
part as a preference payment under applicable law.
 
    If,  on the second  Business Day preceding any  Distribution Date, the Trust
Administrator determines that funds expected to be in the Certificate Account on
such Distribution Date will be insufficient to make the Guaranteed Distributions
on  the  Class  A-17  Certificates   for  that  Distribution  Date,  the   Trust
Administrator is required to make a claim under the Policy in the amount of such
deficiency.  Payment  of  claims under  the  Policy  will be  made  by Financial
Security following Receipt by Financial  Security of the appropriate notice  for
payment  on the later  to occur of  (a) 12:00 noon,  New York City  time, on the
second Business Day following Receipt of  such notice for payment and (b)  12:00
noon,  New York City time, on the  date on which such Guaranteed Distribution is
due to be distributed on the Class A-17 Certificates.
 
    If  payment  of  any  amount  avoided  as  a  preference  under   applicable
bankruptcy, insolvency, receivership or similar law is required to be made under
the Policy, Financial Security shall cause such payment to be made on the latter
of  (a) the date when due to be paid  pursuant to the Order referred to below or
(b) the first  to occur  of (i)  the fourth  Business Day  following Receipt  by
Financial  Security from the Trust Administrator of  (A) a certified copy of the
order (the "Order")  of the  court or  other governmental  body which  exercised
jurisdiction  to the effect that the  relevant Class A-17 Certificateholders are
required to  return  principal or  interest  distributed with  respect  to  such
Subclass during the term of the Policy because such distributions were avoidable
preferences  under applicable bankruptcy law, (B) a certificate of each relevant
Class A-17 Certificateholder that the Order has been entered and is not  subject
to  any stay and (C) an assignment  duly executed and delivered by each relevant
Certificateholder, in such form as is reasonably required by Financial  Security
and  provided  to  the  relevant  Class  A-17  Certificateholders  by  Financial
Security, irrevocably assigning to Financial  Security all rights and claims  of
the  Certificateholder relating to or arising  under the Class A-17 Certificates
held by such  Certificateholder against  the debtor which  made such  preference
payment or otherwise with respect to such preference payment or (ii) the date of
Receipt by Financial Security from the Trust Administrator of the items referred
to  in clauses (A), (B) and  (C) above if, at least  four Business Days prior to
such date of Receipt, Financial Security shall have Received written notice from
the Trust Administrator that such  items were to be  delivered on such date  and
such  date was specified in such notice.  Such payment shall be disbursed to the
receiver, conservator, debtor-in-possession  or trustee in  bankruptcy named  in
the  Order and  not to the  Trustee, the  Trust Administrator or  any Class A-17
Certificateholder directly (unless  such Certificateholder  has previously  paid
such  amount to  the receiver,  conservator, debtor-in-possession  or trustee in
bankruptcy named in the Order, in which case such payment shall be disbursed  to
the Trust Administrator for distribution to such Certificateholder upon proof of
such  payment reasonably satisfactory to Financial Security). In connection with
the foregoing, Financial Security  shall have certain  rights of subrogation  as
described in the Pooling and Servicing Agreement.
 
    The  terms "Receipt" and "Received," with respect to the Policy, mean actual
delivery to Financial Security and to Financial Security's fiscal agent, if any,
prior to 12:00 noon, New York City time, on a Business Day; delivery either on a
day that is not a Business Day or after 12:00 noon, New York City time, will  be
deemed  to be  Receipt on  the next  succeeding Business  Day. If  any notice or
certificate given under the Policy by  the Trust Administrator is not in  proper
form  or is not properly completed, executed or delivered, it will be deemed not
to have been Received, and Financial Security or its fiscal agent will  promptly
so  advise the  Trust Administrator  and the  Trust Administrator  may submit an
amended notice.
 
    Under the Policy, "Business Day" means any day other than (i) a Saturday  or
Sunday  or (ii) a day on which banking institutions in the City of New York, New
York or St.  Paul, Minnesota  are authorized or  obligated by  law or  executive
order to be closed.
 
                                      S-63
<PAGE>
    "Term  of  the Policy"  means  the period  from  and including  the  date of
issuance of  the Policy  to and  including the  date on  which (i)  the Class  A
Subclass  Principal Balance of  the Class A-17 Certificates  is reduced to zero,
(ii) any period during  which any payment on  the Class A-17 Certificates  could
have  been avoided in whole or in  part as a preference payment under applicable
bankruptcy, insolvency, receivership or  similar law has  expired, and (iii)  if
any  proceedings  requisite  to  avoidance as  a  preference  payment  have been
commenced prior to  the occurrence of  (i) and (ii),  a final and  nonappealable
order in resolution of each such proceeding has been entered.
 
    Financial  Security's obligations under the  Policy in respect of Guaranteed
Distributions will be  discharged to  the extent  funds are  transferred to  the
Trust  Administrator as  provided in  the Policy whether  or not  such funds are
properly applied by the Trust Administrator.
 
    Financial Security will  be subrogated  to the rights  of each  holder of  a
Class  A-17 Certificate to receive distributions on the Class A-17 Certificates,
as applicable, to  the extent  of any payment  by Financial  Security under  the
Policy.
 
    Claims  under  the Policy  will rank  equally with  any other  unsecured and
unsubordinated obligations of Financial Security except for certain  obligations
in  respect  of tax  and other  payments to  which preference  is or  may become
afforded by statute. The terms  of the Policy cannot  be modified or altered  by
any   other  agreement  or  instrument,  or  by  the  merger,  consolidation  or
dissolution of the Seller. The Policy may  not be cancelled or revoked prior  to
payment in full of the Class A-17 Certificates. The Policy is not covered by the
property/casualty  insurance security  fund specified in  Article 76  of the New
York Insurance Law. The Policy is governed by the laws of the State of New York.
 
FINANCIAL SECURITY ASSURANCE INC.
 
    GENERAL.   Financial Security  Assurance Inc.  ("Financial Security")  is  a
monoline  insurance company incorporated in 1984 under  the laws of the State of
New York.  Financial  Security  is  licensed to  engage  in  financial  guaranty
insurance business in all 50 states, the District of Columbia and Puerto Rico.
 
    Financial  Security  and its  subsidiaries are  engaged  in the  business of
writing financial  guaranty  insurance,  principally in  respect  of  securities
offered  in  domestic  and  foreign  markets.  In  general,  financial  guaranty
insurance consists of  the issuance of  a guaranty of  scheduled payments of  an
issuer's  securities -- thereby enhancing the  credit rating of those securities
- -- in  consideration for  the payment  of a  premium to  the insurer.  Financial
Security  and its  subsidiaries principally  insure asset-backed, collateralized
and municipal  securities. Asset-backed  securities are  generally supported  by
residential  mortgage loans, consumer or  trade receivables, securities or other
assets having  an  ascertainable  cash  flow  or  market  value.  Collateralized
securities  include  public  utility  first  mortgage  bonds  and sale/leaseback
obligation bonds.  Municipal securities  consist largely  of general  obligation
bonds,  special revenue bonds  and other special obligations  of state and local
governments. Financial Security insures both newly issued securities sold in the
primary market  and outstanding  securities sold  in the  secondary market  that
satisfy Financial Security's underwriting criteria.
 
    Financial  Security  is  a  wholly owned  subsidiary  of  Financial Security
Assurance Holdings Ltd. ("Holdings"), a New York Stock Exchange listed  company.
Major shareholders of Holdings include Fund American Enterprises Holdings, Inc.,
U.S.  WEST Capital Corporation and The Tokio Marine and Fire Insurance Co., Ltd.
No shareholder of Holdings is obligated to pay any debt of Financial Security or
any claim under any insurance policy issued by Financial Security or to make any
additional contribution to the capital of Financial Security.
 
    The principal executive  offices of  Financial Security are  located at  350
Park Avenue, New York, New York 10022, and its telephone number at that location
is (212) 826-0100.
 
    REINSURANCE.     Pursuant  to  an  intercompany  agreement,  liabilities  on
financial  guaranty  insurance  written  or  reinsured  from  third  parties  by
Financial   Security  or  any  of   its  domestic  operating  insurance  company
subsidiaries are reinsured  among such  companies on  an agreed-upon  percentage
 
                                      S-64
<PAGE>
substantially  proportional to  their respective capital,  surplus and reserves,
subject  to  applicable  statutory  risk  limitations.  In  addition,  Financial
Security  reinsures a portion of its  liabilities under certain of its financial
guaranty insurance  policies with  other reinsurers  under various  quota  share
treaties and on a transaction-by-transaction basis. Such reinsurance is utilized
by  Financial Security as  a risk management  device and to  comply with certain
statutory and rating agency requirements; it  does not alter or limit  Financial
Security's obligations under any financial guaranty insurance policy.
 
    RATING OF CLAIMS-PAYING ABILITY.  Financial Security's claims-paying ability
is  rated "Aaa"  by Moody's  Investors Services, Inc.  and "AAA"  by S&P, Nippon
Investors Service Inc. and Standard & Poor's (Australia) Pty. Ltd. Such  ratings
reflect   only  the   views  of   the  respective   rating  agencies,   are  not
recommendations to buy, sell or hold  securities and are subject to revision  or
withdrawal at any time by such rating agencies.
 
    CAPITALIZATION.    The  following  table sets  forth  the  capitalization of
Financial Security and its wholly owned  subsidiaries on the basis of  generally
accepted accounting principles as of December 31, 1995 (in thousands):
 
<TABLE>
<CAPTION>
                                                                MARCH 31, 1996
                                                              ------------------
                                                                 (UNAUDITED)
<S>                                                           <C>
Unearned Premium Reserve (net of prepaid reinsurance
 premiums)..................................................       $340,226
                                                              ------------------
Shareholder's Equity:
  Common Stock..............................................         15,000
  Additional Paid-In Capital................................        681,470
  Unrealized Loss on Investments (net of deferred income
   taxes)...................................................           (737)
  Accumulated Earnings......................................         83,444
                                                              ------------------
Total Shareholder's Equity..................................       $779,177
                                                              ------------------
Total Unearned Premium Reserve and Shareholder's Equity.....      1$,119,403
                                                              ------------------
                                                              ------------------
</TABLE>
 
    For  further information concerning Financial Security, see the Consolidated
Financial Statements  of  Financial Security  and  Subsidiaries, and  the  notes
thereto, incorporated by reference herein. Copies of the statutory quarterly and
annual  statements  filed with  the State  of New  York Insurance  Department by
Financial Security are available upon request to the State of New York Insurance
Department.
 
    INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE.  The consolidated financial
statements of  Financial  Security  and  its subsidiaries  for  the  year  ended
December  31, 1995 included as an exhibit to  the Annual Report on Form 10-K for
the year  ended December  31, 1995  and the  unaudited financial  statements  of
Financial  Security for the three month period  ended March 31, 1996 included as
an exhibit to the Quarterly Report on Form 10-Q for the quarter ended March  31,
1996,  each of which has been filed  with the Securities and Exchange Commission
by Holdings, are hereby incorporated by reference in this Prospectus Supplement.
 
    All financial statements of Financial Security and subsidiaries included  in
documents filed by Holdings pursuant to Section 13(a), 13(c), 14 or 15(d) of the
Securities  Exchange Act of 1934, as amended (the "Exchange Act"), subsequent to
the date  of this  Prospectus Supplement  and prior  to the  termination of  the
offering  of the  Certificates shall be  deemed to be  incorporated by reference
into this Prospectus  Supplement and  to be a  part hereof  from the  respective
dates of filing such documents.
 
    INSURANCE  REGULATION.    Financial  Security  is  licensed  and  subject to
regulation as a financial guaranty insurance  corporation under the laws of  the
State  of New York, its  state of domicile. In  addition, Financial Security and
its insurance subsidiaries are  subject to regulation by  insurance laws of  the
various  other jurisdictions  in which  they are licensed  to do  business. As a
financial guaranty insurance corporation licensed to do business in the State of
New York, Financial Security is subject to Article 69 of the New York  Insurance
Law  which, among  other things,  limits the  business of  each such  insurer to
financial guaranty  insurance  and related  lines,  requires that  each  insurer
maintain a
 
                                      S-65
<PAGE>
minimum  surplus to  policyholders, establishes  contingency, loss  and unearned
premium reserve  requirements for  each such  insurer, and  limits the  size  of
individual   transactions  ("single  risks")  and  the  volume  of  transactions
("aggregate risks")  that  may  be  underwritten by  each  such  insurer.  Other
provisions  of  the New  York Insurance  Law,  applicable to  non-life insurance
companies such as  Financial Security, regulate,  among other things,  permitted
investments,  payment  of  dividends,  transactions  with  affiliates,  mergers,
consolidations, acquisitions or sales of assets and incurrence of liability  for
borrowings.
 
RESTRICTIONS ON TRANSFER OF THE CLASS A-R AND CLASS A-LR 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 Trust Administrator an affidavit (or, to  the
extent  acceptable to  the Trust  Administrator, 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 Trust Administrator
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 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.
 
    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  Trust  Administrator with  an  effective  Internal  Revenue
Service Form 4224 or (ii) the transferee delivers to both the transferor and the
Trust  Administrator 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 transferee.  Any transferor  or
agent  to whom the Trust Administrator provides information as to any applicable
tax imposed on  such transferor or  agent may be  required to bear  the cost  of
computing or
 
                                      S-66
<PAGE>
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.
 
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  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
Certificates,  any  Class  A  Subclass Interest  Shortfall  Amount  arising with
respect to each Subclass on such Distribution Date, any remaining unpaid Class A
Subclass Interest Shortfall Amount with  respect to each Subclass, after  giving
effect  to such  distribution and  any Non-Supported  Interest Shortfall  or the
interest portion of Realized Losses allocable  to such Subclass 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
Balances  of the  Class A-6  A Scheduled  Component, the  Class A-6  B Scheduled
Component, the Class  A-7 Accrual  Component, the  Class A-7  PO Component,  the
Class  A-8  A Component  and the  Class A-8  B Component,  the Class  A Subclass
Principal Balance of each Subclass of  Class A Certificates after giving  effect
to  the distribution of principal and the allocation of the principal portion of
Realized Losses to such Subclass 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 for the  following Distribution Date (without
giving effect  to  partial  prepayments and  net  Partial  Liquidation  Proceeds
received  after the Determination Date in the  current month that are applied as
of the Due Date occurring in such  month), 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 B 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
Financial  Security, 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 B  Certificates)
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 B  Certificates) protection against Realized  Losses,
as  more fully  described below.  If Realized  Losses exceed  the credit support
provided through subordination to the Class A 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 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  and Financial Security to receive, prior to any distribution being made
on a Distribution Date in  respect of the Class  B Certificates, the amounts  of
principal  and  interest  due the  Class  A Certificateholders  and  the Premium
Payment due  Financial  Security on  each  Distribution  Date out  of  the  Pool
Distribution Amount with respect to such date and, if necessary, by the right of
such  holders  and Financial  Security to  receive  future distributions  on the
Mortgage   Loans   that   would   otherwise    have   been   payable   to    the
 
                                      S-67
<PAGE>
holders  of 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   Subclasses  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 Senior Optimal  Amount and the Class
A-7 PO Component Deferred Amount 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 Class B Certificates are entitled
has been reduced to zero as a result of the allocation of losses to the Class  B
Certificates, i.e., the date on which the Class B 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.
 
    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  the adjustment  of  the  principal
balance  of  the  most  subordinate  Subclass  of  Class  B  Certificates  then-
outstanding in such  amount as  is necessary  to cause the  sum of  the Class  A
Subclass Principal Balances and the Class B Subclass Principal Balances to equal
the Adjusted Pool Amount.
 
    Allocations to the 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 Trust Administrator 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  partial  principal  prepayments  and  net  Partial
Liquidation Proceeds  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 as described above under "-- Distributions."
 
    Solely for the purpose  of allocating the interest  portion of any  Realized
Loss, including any Excess Special Hazard Losses, Excess Fraud Losses and Excess
Bankruptcy  Losses, to the Class A Certificates as described herein, the Premium
Payment will be  treated as  though it represented  the interest  accrued on  an
additional  Subclass of Class  A Certificates. Accordingly,  the Premium Payment
will be reduced by its pro rata portion of any such loss allocated to the  Class
A Certificates.
 
    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-7 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-7 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-6, Class A-7  and Class A-8 Certificates) the Class  A-6
Components, the Class A-7 Accrual Component and the Class A-8 Components will be
allocated  to  such  outstanding Subclasses  of  Class A  Certificates  and such
Components pro rata in accordance with their Class A Subclass Principal Balances
or Component Principal Balances or, in the
 
                                      S-68
<PAGE>
case of  the  Class  A-7  Accrual Component,  the  initial  Component  Principal
Balance,  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-7 Certificates  will be
allocated among the Class A-7 Components (other than the Class A-7 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-7 Certificates with respect to the Class A-7 PO Component) and 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-7 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 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-7 Certificates  with  respect  to the  Class  A-7  PO
Component)  will  be  allocated  among the  outstanding  Subclasses  of  Class A
Certificates (other than the  Class A-6, Class A-7  and Class A-8  Certificates)
the  Class A-6  Components, the  Class A-7 Accrual  Component and  the Class A-8
Components pro rata in accordance  with their then-outstanding Class A  Subclass
Principal  Balances or Component Principal Balances or, in the case of the Class
A-7 Accrual Component, the  initial Component Principal  Balance, 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-7  and  Class  A-18
Certificates)  and  the  Class  A-7  Components (other  than  the  Class  A-7 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 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 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-7 Certificates) and the Class A-7 Certificates to the extent of  the
Class  A-7 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 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  Class B Certificates  until the the  Class B Principal
Balance has been reduced to zero. 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-7 PO Component)  and Class B  Certificates and (ii)  to the extent  such
Excess  Special Hazard Losses arise with respect to Discount Mortgage Loans, the
Class A-7 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
 
                                      S-69
<PAGE>
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 1996-1 Certificates, the "Special Hazard Loss Amount" with respect
thereto  will be equal to approximately  1.00% (approximately $5,548,517) 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  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
Certificates,  as evidenced by letters to that effect delivered by Fitch and S&P
to the Master Servicer and the Trust Administrator. 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 Class B Certificates until the Class B Principal Balance has been reduced to
zero. Fraud Losses in excess of the Fraud Loss Amount are "Excess Fraud Losses."
Excess Fraud Losses will be allocated among (i) the Class A Certificates  (other
than the Class A-7 PO Component) and Class B Certificates and (ii) to the extent
such  Excess Fraud  Losses arise  with respect  to Discount  Mortgage Loans, the
Class A-7 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 1996-1
Certificates, the "Fraud  Loss Amount"  with respect  thereto will  be equal  to
approximately  2.00% (approximately  $11,097,033) 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 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 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 Class B Certificates until the Class B Principal Balance has been
reduced to zero. 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-7 PO  Component) and Class B
Certificates and (ii)  to the extent  such Excess Bankruptcy  Losses arise  with
respect to Discount Mortgage Loans, the Class A-7 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
 
                                      S-70
<PAGE>
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  1996-1 Certificates, the  "Bankruptcy Loss Amount" with
respect thereto will be equal to approximately 0.04% (approximately $206,884) 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
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  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 Certificates by Fitch and S&P. 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 Trust Administrator 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  initial principal  balance of  the Class  B Certificates  in the
aggregate will be approximately $33,291,970, the risk of Special Hazard  Losses,
Fraud  Losses and  Bankruptcy Losses  will be  separately borne  by the  Class B
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 they will bear to the full extent of  their
initial  principal  balance.  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-71
<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  2,042
promissory  notes,  to have  an  aggregate unpaid  principal  balance as  of the
Cut-Off Date (the "Cut-Off Date  Aggregate Principal Balance") of  approximately
$554,851,652  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 one of the Mortgage Loans in the
Trust  Estate, representing  approximately 0.04%  of the  Cut-Off Date Aggregate
Principal Balance of the Mortgage Loans will be secured by Co-op Shares and that
12 of the Mortgage Loans, representing  approximately 0.66% of the Cut-Off  Date
Aggregate  Principal Balance of the Mortgage  Loans, will be Buy-Down 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  $19,957  or  more   than
approximately  $1,951,167,  and  the  average unpaid  principal  balance  of the
Mortgage Loans  is expected  to  be approximately  $271,720. The  latest  stated
maturity  date of  any of  the Mortgage Loans  is expected  to be  July 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,  1,950 of  the Mortgaged  Properties, which secure
approximately 95.91%  of the  Cut-Off Date  Aggregate Principal  Balance of  the
Mortgage  Loans, are expected to be owner occupied primary residences, 91 of the
Mortgaged Properties,  which  secure approximately  4.08%  of the  Cut-Off  Date
Aggregate  Principal  Balance of  the Mortgage  Loans, are  expected to  be non-
 
- ------------------------
(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 1996-1 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
    1996-1 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-72
<PAGE>
owner  occupied  or second  homes  and one  of  the Mortgaged  Properties, which
secures approximately 0.01% of the  Cut-Off Date Aggregate Principal Balance  of
the  Mortgage Loans, is expected  to be an investor  property. See "The Mortgage
Loan Programs -- Mortgage Loan Underwriting" in the Prospectus.
 
    It is expected that eight  of the Mortgage Loans representing  approximately
0.46% of the Cut-Off Date Aggregate Principal Balance of the Mortgage Loans will
be   subject  to  subsidy  agreements,   which,  except  under  certain  limited
circumstances, require the employers of the related mortgagors to make a portion
of the  payments on  the related  Mortgage Loans  (each, a  "Subsidy Loan")  for
specified  periods. The  Subsidy Loans  were underwritten  by PHMC.  The subsidy
agreements relating to  the Subsidy  Loans generally will  provide that  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  payments being  provided by  the employer  of the  mortgagors in
advance, generally on an  annual basis. Subsidy Loans  are offered by  employers
generally  through  either  a graduated  or  fixed  subsidy loan  program,  or a
combination thereof. The effective subsidized  rates under the various  programs
offered  generally range from  one to five percentage  points below the interest
rate specified in the related mortgage note. These subsidized rates are used  to
calculate  the applicable  debt-to-income ratios that  are used  to evaluate the
creditworthiness of  prospective borrowers.  This procedure  may enable  certain
mortgagors  who otherwise would  not meet the  Underwriting Guidelines to obtain
mortgage loans. See "Prepayment and Yield Considerations" herein.
 
    Subsidy amounts paid by the employer  will be deposited by Norwest  Mortgage
in an account (the "Subsidy Account") maintained by Norwest Mortgage, which will
not  be part of the Trust Estate or the REMIC. Funds in the Subsidy Account with
respect to each Subsidy Loan will be withdrawn by Norwest Mortgage and deposited
in the Servicer Custodial Account on  the business day following the receipt  by
Norwest  Mortgage of the mortgagor's monthly payment to which such funds relate.
Funds in  the  Subsidy Account  with  respect to  a  Subsidy Loan  will  not  be
withdrawn  by Norwest Mortgage,  and are not  permitted to be  applied under the
related subsidy agreement, during  any period in which  such Subsidy Loan is  in
default.  Despite the existence of the  subsidy agreement, the mortgagor remains
liable for making all scheduled payments on  a Subsidy Loan. From time to  time,
the amount of a subsidy payment or the term of a subsidy agreement may, upon the
request of a corporate employer, be modified.
 
    As  of the Cut-Off  Date, there were  692 Discount Mortgage  Loans having an
aggregate unpaid principal  balance of  approximately $203,213,372,  a range  of
unpaid principal balances of approximately $19,957 to approximately $647,958, an
average  unpaid principal balance of approximately $293,661, a range of interest
rates from  6.250% to  7.750% per  annum, a  weighted average  interest rate  of
approximately 7.463% per annum, a range of remaining terms to stated maturity of
237  months to 359 months, a weighted  average remaining term to stated maturity
of approximately 355 months, a range  of original Loan-to-Value Ratios of  9.17%
to  95.00%,  a weighted  average original  Loan-to-Value Ratio  of approximately
74.38% 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 32.39%  in  California,
9.48% in New York and 8.24% in New Jersey.
 
    As  of the Cut-Off Date,  there were 1,350 Premium  Mortgage Loans having an
aggregate unpaid principal  balance of  approximately $351,638,280,  a range  of
unpaid  principal balances of approximately $29,961 to approximately $1,951,167,
an average  unpaid  principal balance  of  approximately $260,473,  a  range  of
interest rates from 7.875% to 9.750% per annum, a weighted average interest rate
of approximately 8.324% per annum, a range of remaining terms to stated maturity
of  227  months to  360  months, a  weighted  average remaining  term  to stated
maturity of approximately 356 months,  a range of original Loan-to-Value  Ratios
of  26.67%  to  95.00%,  a  weighted  average  original  Loan-to-Value  Ratio of
approximately 76.85%  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  37.97% in California, 9.64% in New  York, 7.09% in New Jersey and
5.55% in Florida.
 
                                      S-73
<PAGE>
    The Mortgage Loans 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  97.14% (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") 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.
Approximately 0.04% and 0.89% (by  Cut-Off Date Aggregate Principal Balance)  of
the  Mortgage Loans (the "Pool Certification Underwritten Loans") will have been
reviewed by  GEMICO and  UGRIC,  respectively, to  ensure compliance  with  such
company's  credit,  appraisal  and underwriting  standards.  Neither  the Series
1996-1 Certificates nor  any of  the Mortgage  Loans are  insured or  guaranteed
under  a mortgage  pool insurance  policy issued by  GEMICO and  UGRIC. The Pool
Certification  Underwritten  Loans  were  evaluated  using  credit  scoring   as
described  in the Prospectus under "The  Mortgage Loan Programs -- Mortgage Loan
Underwriting" and, based on  the credit scores of  such Mortgage Loans, some  of
such  Mortgage Loans were  re-underwritten. The remaining  approximate 1.93% (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 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 73.19%  (by  Cut-Off  Date Aggregate  Principal  Balance)  of  the
Mortgage  Loans were generally underwritten  in accordance with the Underwriting
Standards used by PHMC, underwriting guidelines  of the originators of the  Bulk
Purchase  Underwritten Loans or the standards  of GEMICO or UGRIC. Approximately
26.81% (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.
 
                                      S-74
<PAGE>
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>
6.250%.............................        1       $    295,163.25        0.05   %
6.500%.............................        3            815,573.48        0.15
6.875%.............................       15          3,626,481.50        0.65
7.000%.............................       22          6,038,560.71        1.09
7.125%.............................       53         14,825,623.40        2.67
7.250%.............................       87         27,624,855.96        4.98
7.375%.............................      109         31,737,981.19        5.72
7.500%.............................      138         41,326,355.90        7.45
7.625%.............................      106         31,098,179.46        5.60
7.750%.............................      158         45,824,596.67        8.26
7.875%.............................      193         58,871,531.70       10.61
8.000%.............................      151         40,250,135.83        7.25
8.125%.............................      115         31,880,853.95        5.75
8.250%.............................      192         51,185,788.59        9.23
8.375%.............................      158         42,102,371.85        7.59
8.500%.............................      167         42,870,043.84        7.73
8.625%.............................      125         31,404,665.99        5.66
8.750%.............................       99         24,112,985.99        4.35
8.875%.............................       67         13,323,759.32        2.40
9.000%.............................       40          7,979,825.74        1.44
9.125%.............................       16          2,632,230.38        0.47
9.250%.............................       14          2,894,705.63        0.52
9.375%.............................        7          1,061,440.07        0.19
9.500%.............................        5            573,172.45        0.10
9.750%.............................        1            494,769.06        0.09
                                       -----       ---------------     -------
        Total......................    2,042       $554,851,651.91      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    As  of the Cut-Off Date, the weighted  average Mortgage Interest Rate of the
Mortgage Loans  is  expected to  be  approximately  8.008% 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 as  set forth in the
Pooling and  Servicing Agreement,  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 7.738% per annum.
 
                                      S-75
<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>
227................................        1       $    148,660.98        0.03   %
237................................        4          1,126,609.54        0.20
238................................        5          1,400,957.66        0.25
239................................        5          1,339,132.27        0.24
269................................        1            206,043.38        0.04
271................................        1            386,807.63        0.07
272................................        3            894,375.12        0.16
273................................        3            827,635.16        0.15
277................................        1            188,597.51        0.03
278................................        1            232,313.83        0.04
280................................        1            342,590.89        0.06
298................................        1            220,706.85        0.04
316................................        1            249,546.22        0.04
326................................        1            203,144.32        0.04
328................................        1          1,951,166.86        0.35
339................................        1            187,529.05        0.03
342................................        1            107,055.06        0.02
344................................        3            726,500.16        0.13
346................................        2            316,279.70        0.06
347................................        3            488,203.48        0.09
348................................        7          1,861,346.90        0.34
349................................        6          1,061,167.47        0.19
350................................       14          4,395,823.94        0.79
351................................        9          2,408,242.72        0.43
352................................       27          7,305,352.74        1.32
353................................       15          3,674,934.76        0.66
354................................       57         12,787,047.01        2.30
355................................       61         15,788,289.23        2.85
356................................      185         49,444,215.60        8.91
357................................      626        165,467,245.35       29.82
358................................      698        196,787,461.75       35.48
359................................      296         82,273,668.77       14.83
360................................        1             53,000.00        0.01
                                       -----       ---------------     -------
        Total......................    2,042       $554,851,651.91      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-76
<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>
1988...............................        1       $    206,043.38        0.04   %
1989...............................       10          2,872,320.14        0.52
1992...............................        1            249,546.22        0.04
1993...............................        2          2,154,311.18        0.39
1994...............................        3            617,149.22        0.11
1995...............................      143         34,701,235.23        6.25
1996...............................    1,882        514,051,046.54       92.65
                                       -----       ---------------     -------
        Total......................    2,042       $554,851,651.91      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    It  is  expected that  the earliest  month  and year  of origination  of any
Mortgage Loan was November 1988 and the latest month and year of origination was
May 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........................       88       $ 25,790,091.28        4.65   %
50.01- 55.00%......................       44         11,558,948.57        2.08
55.01- 60.00%......................       68         18,916,974.95        3.41
60.01- 65.00%......................       95         27,610,978.76        4.98
65.01- 70.00%......................      177         52,576,450.14        9.48
70.01- 75.00%......................      266         73,591,270.64       13.26
75.01- 80.00%......................      854        226,363,041.52       40.79
80.01- 85.00%......................       56         15,792,474.72        2.85
85.01- 90.00%......................      303         80,597,923.09       14.53
90.01- 95.00%......................       91         22,053,498.24        3.97
                                       -----       ---------------     -------
        Total......................    2,042       $554,851,651.91      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  9.17%  and 95.00%,
respectively, and the weighted average Loan-to-Value Ratio at origination of the
Mortgage Loans is expected to  be approximately 75.94%. 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 120 of the  Mortgage
Loans  having Loan-to-Value Ratios at origination in excess of 80%, representing
approximately 5.94%  (by  Cut-Off  Date  Aggregate  Principal  Balance)  of  the
Mortgage Loans, were originated without primary mortgage insurance.
 
                                      S-77
<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.................    1,295       $392,821,228.02       70.80   %
Asset and Mortgage Verification....      443         74,254,252.73       13.38
Income and Mortgage Verification...       81         22,952,927.26        4.14
Asset Verification.................       28          8,698,054.02        1.57
Income Verification................        0                  0.00        0.00
Mortgage Verification..............      181         53,288,480.05        9.60
Preferred Processing...............       14          2,836,709.83        0.51
                                       -----       ---------------     -------
        Total......................    2,042       $554,851,651.91      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."
 
                   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.....      362       $ 41,469,990.30        7.47   %
$200,001-$250,000..................      541        124,747,859.89       22.48
$250,001-$300,000..................      510        139,152,155.64       25.09
$300,001-$350,000..................      259         84,092,032.25       15.16
$350,001-$400,000..................      165         61,776,359.75       11.13
$400,001-$450,000..................       75         31,917,526.29        5.75
$450,001-$500,000..................       66         31,784,740.12        5.73
$500,001-$550,000..................       24         12,643,940.81        2.28
$550,001-$600,000..................       24         13,758,948.07        2.48
$600,001-$650,000..................        8          5,066,987.07        0.91
$700,001-$750,000..................        1            749,533.83        0.14
$850,001-$900,000..................        2          1,746,123.79        0.31
$950,001-$1,000,000................        4          3,994,287.24        0.72
Over $ 1 Million...................        1          1,951,166.86        0.35
                                       -----       ---------------     -------
        Total......................    2,042       $554,851,651.91      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    As of the Cut-Off Date, the average unpaid principal balance of the Mortgage
Loans is expected  to be  approximately $271,720. 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 60.51%
and  80.00%,  respectively. See  "The Trust  Estates --  Mortgage Loans"  in the
Prospectus.
 
                                      S-78
<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.............    1,922       $529,296,731.31       95.39   %
Two- to four-family units..........        7          1,971,383.78        0.36
Condominiums
  High-rise (greater than four
   stories)........................       20          4,844,498.58        0.87
  Low-rise (four stories or
   less)...........................       64         11,496,761.86        2.07
Planned unit developments..........       24          6,006,466.94        1.08
Townhouses.........................        4          1,028,959.27        0.19
Cooperative Units..................        1            206,850.17        0.04
                                       -----       ---------------     -------
        Total......................    2,042       $554,851,651.91      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
                                      S-79
<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............................        5       $  1,372,149.96        0.25   %
Arizona............................       47         11,935,920.24        2.15
Arkansas...........................        3          1,002,152.09        0.18
California.........................      687        199,334,130.83       35.93
Colorado...........................       64         15,509,892.14        2.80
Connecticut........................       49         13,305,134.52        2.40
Delaware...........................        7          1,849,168.73        0.33
District of Columbia...............        7          1,905,129.31        0.34
Florida............................      108         24,751,301.83        4.46
Georgia............................       44         10,641,474.85        1.92
Hawaii.............................       27         11,528,193.06        2.08
Idaho..............................        8          1,726,246.55        0.31
Illinois...........................       34         10,641,411.59        1.92
Indiana............................        4          1,232,771.08        0.22
Iowa...............................        4          1,304,871.26        0.24
Kansas.............................        1            238,090.98        0.04
Kentucky...........................        2            567,826.88        0.10
Louisiana..........................        7          2,198,588.49        0.40
Maine..............................        2            499,015.14        0.09
Maryland...........................       59         16,771,718.03        3.02
Massachusetts......................       66         16,256,224.35        2.93
Michigan...........................       12          3,849,783.05        0.69
Minnesota..........................       50         13,599,997.41        2.45
Mississippi........................        3            721,515.86        0.13
Missouri...........................        2            493,558.67        0.09
Montana............................        4          1,133,740.60        0.20
Nebraska...........................        5          1,000,478.42        0.18
Nevada.............................       26          6,722,673.88        1.21
New Hampshire......................        2            452,356.68        0.08
New Jersey.........................      156         41,702,331.61        7.52
New Mexico.........................       12          3,190,276.26        0.57
New York...........................      217         53,174,911.02        9.58
North Carolina.....................       19          5,001,301.55        0.90
North Dakota.......................        1            141,655.00        0.03
Ohio...............................       13          3,444,517.13        0.62
Oklahoma...........................        7          1,708,651.06        0.31
Oregon.............................       33          8,877,959.06        1.60
Pennsylvania.......................       45         10,372,640.59        1.87
Rhode Island.......................        9          2,205,573.43        0.40
South Carolina.....................        5          1,111,779.24        0.20
South Dakota.......................        1            284,653.46        0.05
Tennessee..........................       16          4,966,834.96        0.90
Texas..............................       65         17,524,817.37        3.16
Utah...............................       21          5,630,375.63        1.01
Vermont............................        3            831,968.38        0.15
Virginia...........................       52         14,597,808.37        2.63
Washington.........................       23          6,472,898.80        1.17
Wisconsin..........................        3            542,065.93        0.10
Wyoming............................        2            523,116.58        0.09
                                     -----------   ---------------     -------
        Total......................    2,042       $554,851,651.91      100.00   %
                                     -----------   ---------------     -------
                                     -----------   ---------------     -------
</TABLE>
 
    No more than  approximately 0.97%  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-80
<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 Affiliates............    1,122       $317,447,250.57       57.21   %
Other Originators..................      920        237,404,401.34       42.79
                                       -----       ---------------     -------
        Total......................    2,042       $554,851,651.91      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    No single "Other  Originator" is expected  to have accounted  for more  than
5.00% of the Mortgage Loan 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...........................    1,154       $291,431,033.69       52.52   %
Equity Take Out Refinance..........      174         47,695,414.96        8.60
Rate/Term Refinance................      714        215,725,203.26       38.88
                                       -----       ---------------     -------
        Total......................    2,042       $554,851,651.91      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.
 
                             SUBSIDY LOAN PROGRAMS
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
                                     OF MORTGAGE      PRINCIPAL       PRINCIPAL
PROGRAM AND TERM                        LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Fixed (five years or longer).......        0       $          0.00        0.00   %
  (less than five years)...........        0                  0.00        0.00
Graduated (five years or longer)...        3            992,678.47        0.18
  (less than five years)...........        5          1,538,856.79        0.28
Combination (five years or
 longer)...........................        0                  0.00        0.00
  (less than five years)...........        0                  0.00        0.00
                                           -
                                                   ---------------         ---
        Total......................        8       $  2,531,535.26        0.46   %
                                           -
                                           -
                                                   ---------------         ---
                                                   ---------------         ---
</TABLE>
 
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 1996-1
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
 
                                      S-81
<PAGE>
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.
 
OPTIONAL REPURCHASE OF DEFAULTED MORTGAGE LOANS
 
    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.  Furthermore,
there  can be  no assurance  that the  future experience  on the  Mortgage Loans
generally or the Mortgage Loans serviced  by Norwest Mortgage, all of which  are
fixed  interest rate mortgage loans having  original terms to stated maturity of
ranging from approximately 20 to approximately 30 years.
 
    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
 
                                      S-82
<PAGE>
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  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-83
<PAGE>
                           TOTAL NMI PORTFOLIO LOANS
<TABLE>
<CAPTION>
                                                       BY NO.       BY NO.       BY NO.
                                                      OF LOANS     OF LOANS     OF LOANS
                                                     -----------  -----------  -----------
                                                        AS OF        AS OF        AS OF
                                                      DECEMBER     DECEMBER     MARCH 31
                                                      31, 1994     31, 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-84
<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-85
<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-86
<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-87
<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 of the Offered Certificates,  the aggregate amount of distributions  on
any  Subclass  of the  Offered Certificates  and  the yield  to maturity  of any
Subclass 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-7  Certificates  with  respect to  the  Class  A-7 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-7 Certificates  in proportion to  the interest of  the Class A-7 PO
Component in  such  Discount  Mortgage  Loan represented  by  the  PO  Fraction.
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
 
                                      S-88
<PAGE>
under "Prepayment and Yield  Considerations"), no assurance can  be given as  to
such  rate or  the rate  of principal  payments on  any Subclass  of the Offered
Certificates or the  aggregate amount of  distributions on any  Subclass 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.
 
    The effect of subsidy agreements on the rate of prepayment of Subsidy  Loans
is  uncertain. The rate of  prepayment on Subsidy Loans  may be affected by such
factors as the relationship between prevailing mortgage rates and the  effective
interest  rates  on  such  Subsidy  Loans, the  remaining  term  of  the subsidy
agreements, and requests by the related employers for refinance or modification.
The subsidy agreement  relating to  a Subsidy  Loan generally  provides that  if
prevailing  market rates of  interest on mortgage loans  similar to such Subsidy
Loan decline relative to the Mortgage Interest Rate of such Subsidy Loan by  the
percentage set forth in the subsidy agreement, the employer may request that the
mortgagor  refinance such  Subsidy Loan. In  the event  the mortgagor refinances
such Subsidy Loan, the Subsidy Loan will  be prepaid, and the new loan will  not
be  included  in the  Trust Estate.  If  the mortgagor  fails to  refinance such
Subsidy Loan,  the employer  may  terminate the  related subsidy  agreement.  In
addition,  the termination of  the subsidy agreement relating  to a Subsidy Loan
for any  reason  (whether  due  to  the  mortgagor's  failure  to  refinance  or
otherwise)  may increase the financial burden of the mortgagor, who may not have
otherwise qualified  for  a  mortgage under  Norwest  Mortgage's  mortgage  loan
underwriting  guidelines, and may consequently increase the risk of default with
respect to the related Mortgage Loan. See "The Trust Estates -- Mortgage  Loans"
and   "The  Mortgage  Loan  Programs  --  Mortgage  Loan  Underwriting"  in  the
Prospectus. From time to time, the amount of the subsidy payment or the term  of
the  subsidy  agreement may,  upon  the request  of  the corporate  employer, be
modified.
 
    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,
 
                                      S-89
<PAGE>
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 1996-1
Certificates. See "Prepayment and Yield Considerations" in the Prospectus.
 
    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,
PARTICULARLY   THE  CLASS  A-18  CERTIFICATES,  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 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  the  Class   B
Certificates. See "Description of the Certificate -- Interest" and "Servicing of
the Mortgage Loans -- Anticipated Changes in Servicing."
 
    The  yield to maturity  on the Offered  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 and  floods, which may  adversely affect property  values.
Any  deterioration in housing prices in California,  as well as in New York, New
Jersey 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.
 
    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  of Offered
Certificates. An investor is urged to  make an investment decision with  respect
to  any  Subclass of  Offered  Certificates based  on  the anticipated  yield to
maturity of such Subclass  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
of  Offered Certificates are purchased at a discount or a premium and the degree
to which such Subclass is sensitive to the timing of prepayments will  determine
the  extent to which  the yield to maturity  of such Subclass  may vary from the
anticipated yield. An investor should
 
                                      S-90
<PAGE>
carefully consider the associated risks, including, in the case of any  Subclass
of  Offered Certificates  purchased at a  discount, particularly  the Class A-18
Certificates, 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 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 or, in the case of the Class A-18 Certificates,
the  anticipated yield thereon.  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.
 
    As  referred  to herein,  the weighted  average  life of  a Subclass  of the
Offered Certificates refers to the average amount of time that will elapse  from
the  date of  issuance of such  Subclass until  each dollar in  reduction of the
principal balance of such Subclass is distributed to the investor. The  weighted
average life of each Subclass 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.
 
    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,  "175%  SPA"  assumes
prepayment  rates equal to 175% 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 assuming, among other  things,
that  (i)  that  the  Trust  Estate  consists  of  11  Mortgage  Loans  with the
characteristics set forth below,  (ii) 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,  (iii)
scheduled monthly payments of principal and interest
 
                                      S-91
<PAGE>
on  the Mortgage Loans  will be timely received  on the first  day of each month
(with no  defaults),  commencing  in  August 1996,  (iv)  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, (v) principal  prepayments in full on
the Mortgage Loans will be received on the last day of each month commencing  in
July  1996 at the respective constant percentages of SPA set forth in the tables
and  there  are  no  partial   principal  prepayments  or  Prepayment   Interest
Shortfalls, (vi) the Series 1996-1 Certificates will be issued on July 25, 1996,
(vii)  distributions to Certificateholders will be made  on the 25th day of each
month, commencing in  August 1996  and (viii)  distributions on  the Class  A-17
Certificates  on each Distribution Date will be  made pro rata to the holders of
the Class A-17 Certificates  based on their  respective Percentage Interests  in
such Subclass and without rounding or the benefit of the Rounding Account.
 
                     ASSUMED MORTGAGE LOAN CHARACTERISTICS
 
<TABLE>
<CAPTION>
                                                                                               REMAINING       ORIGINAL
                                                                                                TERM TO         TERM TO
                              PRINCIPAL BALANCE                                   MASTER        STATED          STATED
                              AS OF THE CUT-OFF      MORTGAGE       SERVICING    SERVICING     MATURITY        MATURITY
                                     DATE          INTEREST RATE       FEE          FEE       (IN MONTHS)     (IN MONTHS)
                              ------------------  ---------------  -----------  -----------  -------------  ---------------
<S>                           <C>                 <C>              <C>          <C>          <C>            <C>
Mortgage Loan 1.............  $     1,842,869.43     7.3459550000%       0.25%        0.02%          238             240
Mortgage Loan 2.............        2,172,491.02     8.0401834141        0.25         0.02           238             240
Mortgage Loan 3.............       52,432,362.39     7.1446005788        0.25         0.02           357             360
Mortgage Loan 4.............      147,529,251.45     7.5751067821        0.25         0.02           357             360
Mortgage Loan 5.............        1,408,888.25     7.6972202506        0.25         0.02           281             360
Mortgage Loan 6.............      177,205,365.10     8.0554491718        0.25         0.02           357             360
Mortgage Loan 7.............        4,073,332.67     8.0920924803        0.25         0.02           302             360
Mortgage Loan 8.............      139,666,391.65     8.5330893772        0.25         0.02           357             360
Mortgage Loan 9.............       26,391,318.37     8.9788618225        0.25         0.02           357             360
Mortgage Loan 10............           53,000.00     9.3750000000        0.25         0.02           360             360
Mortgage Loan 11............        2,076,381.58     9.4988620860        0.25         0.02           358             360
</TABLE>
 
    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  will be
differences between the characteristics of the actual Mortgage Loans  ultimately
included  in  the Trust  Estate  and the  characteristics  which are  assumed in
preparing the tables, as described above. Any difference may have an effect upon
the actual percentages  of initial  Class A  Subclass Principal  Balance of  the
Subclasses  of Offered  Certificates, the actual  weighted average  lives of the
Subclasses of Offered Certificates  and the date on  which the Class A  Subclass
Principal Balance of any Subclass of Offered Certificates is reduced to zero.
 
    Based  upon  the foregoing  assumptions, the  following tables  indicate the
weighted average life of  each Subclass of Offered  Certificates, and set  forth
the  percentages of the initial Class A  Subclass Principal Balance of each such
Subclass that would  be outstanding after  each of the  dates shown at  constant
percentages of SPA presented.
 
                                      S-92
<PAGE>
       PERCENTAGE OF INITIAL SUBCLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                                 CLASS A-1                                    CLASS A-2
                                                            CERTIFICATES AT THE                          CERTIFICATES AT THE
                                                           FOLLOWING PERCENTAGES                        FOLLOWING PERCENTAGES
                                                                  OF SPA                                        OF SPA
            DISTRIBUTION              ---------------------------------------------------------------  ------------------------
                DATE                      0%          100%         175%         300%         500%          0%          100%
<S>                                   <C>          <C>          <C>          <C>          <C>          <C>          <C>
- ------------------------------------  ---------------------------------------------------------------  ------------------------
Initial.............................         100          100          100          100          100
                                                                                                              100          100
July 1997...........................          65           65           65           65           65
                                                                                                              100          100
July 1998...........................          17            0            0            0            0
                                                                                                              100          100
July 1999...........................           0            0            0            0            0
                                                                                                               53            0
July 2000...........................           0            0            0            0            0
                                                                                                                0            0
July 2001...........................           0            0            0            0            0
                                                                                                                0            0
July 2002...........................           0            0            0            0            0
                                                                                                                0            0
July 2003...........................           0            0            0            0            0
                                                                                                                0            0
July 2004...........................           0            0            0            0            0
                                                                                                                0            0
July 2005...........................           0            0            0            0            0
                                                                                                                0            0
July 2006...........................           0            0            0            0            0
                                                                                                                0            0
July 2007...........................           0            0            0            0            0
                                                                                                                0            0
July 2008...........................           0            0            0            0            0
                                                                                                                0            0
July 2009...........................           0            0            0            0            0
                                                                                                                0            0
July 2010...........................           0            0            0            0            0
                                                                                                                0            0
July 2011...........................           0            0            0            0            0
                                                                                                                0            0
July 2012...........................           0            0            0            0            0
                                                                                                                0            0
July 2013...........................           0            0            0            0            0
                                                                                                                0            0
July 2014...........................           0            0            0            0            0
                                                                                                                0            0
July 2015...........................           0            0            0            0            0
                                                                                                                0            0
July 2016...........................           0            0            0            0            0
                                                                                                                0            0
July 2017...........................           0            0            0            0            0
                                                                                                                0            0
July 2018...........................           0            0            0            0            0
                                                                                                                0            0
July 2019...........................           0            0            0            0            0
                                                                                                                0            0
July 2020...........................           0            0            0            0            0
                                                                                                                0            0
July 2021...........................           0            0            0            0            0
                                                                                                                0            0
July 2022...........................           0            0            0            0            0
                                                                                                                0            0
July 2023...........................           0            0            0            0            0
                                                                                                                0            0
July 2024...........................           0            0            0            0            0
                                                                                                                0            0
July 2025...........................           0            0            0            0            0
                                                                                                                0            0
July 2026...........................           0            0            0            0            0
                                                                                                                0            0
Weighted Average
  Life (years) (1)..................        1.33         1.24         1.24         1.24         1.22         3.08         2.50
 
<CAPTION>
                                                                                                 CLASS A-3
                                                                                            CERTIFICATES AT THE
                                                                                           FOLLOWING PERCENTAGES
                                                                                                   OF SPA
            DISTRIBUTION                                                     --------------------------------------------------
                DATE                     175%         300%         500%          0%          100%         175%         300%
<S>                                   <C>
- ------------------------------------                                         --------------------------------------------------
Initial.............................
                                             100          100          100
                                                                                    100          100          100          100
July 1997...........................
                                             100          100          100
                                                                                    100          100          100          100
July 1998...........................
                                             100          100           34
                                                                                    100          100          100          100
July 1999...........................
                                               0            0            0
                                                                                    100           93           93           29
July 2000...........................
                                               0            0            0
                                                                                     80            1            1            0
July 2001...........................
                                               0            0            0
                                                                                      8            0            0            0
July 2002...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2003...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2004...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2005...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2006...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2007...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2008...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2009...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2010...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2011...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2012...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2013...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2014...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2015...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2016...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2017...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2018...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2019...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2020...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2021...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2022...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2023...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2024...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2025...........................
                                               0            0            0
                                                                                      0            0            0            0
July 2026...........................
                                               0            0            0
                                                                                      0            0            0            0
Weighted Average
 
  Life (years) (1)..................        2.50         2.40         2.00         4.47         3.50         3.50         2.92
 
<CAPTION>
 
            DISTRIBUTION
                DATE                     500%
- ------------------------------------
Initial.............................
 
                                             100
July 1997...........................
 
                                             100
July 1998...........................
 
                                             100
July 1999...........................
 
                                               0
July 2000...........................
 
                                               0
July 2001...........................
 
                                               0
July 2002...........................
 
                                               0
July 2003...........................
 
                                               0
July 2004...........................
 
                                               0
July 2005...........................
 
                                               0
July 2006...........................
 
                                               0
July 2007...........................
 
                                               0
July 2008...........................
 
                                               0
July 2009...........................
 
                                               0
July 2010...........................
 
                                               0
July 2011...........................
 
                                               0
July 2012...........................
 
                                               0
July 2013...........................
 
                                               0
July 2014...........................
 
                                               0
July 2015...........................
 
                                               0
July 2016...........................
 
                                               0
July 2017...........................
 
                                               0
July 2018...........................
 
                                               0
July 2019...........................
 
                                               0
July 2020...........................
 
                                               0
July 2021...........................
 
                                               0
July 2022...........................
 
                                               0
July 2023...........................
 
                                               0
July 2024...........................
 
                                               0
July 2025...........................
 
                                               0
July 2026...........................
 
                                               0
Weighted Average
 
  Life (years) (1)..................        2.29
</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).
 
                                      S-93
<PAGE>
       PERCENTAGE OF INITIAL SUBCLASS 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%          100%         175%         300%         500%          0%         100%
<S>                                   <C>          <C>          <C>          <C>          <C>          <C>          <C>
- ------------------------------------  ---------------------------------------------------------------  ----------------------
Initial.............................         100          100          100          100          100
                                                                                                              100         100
July 1997...........................         100          100          100          100          100
                                                                                                              100         100
July 1998...........................         100          100          100          100          100
                                                                                                              100         100
July 1999...........................         100          100          100          100            0
                                                                                                              100         100
July 2000...........................         100          100          100            0            0
                                                                                                              100         100
July 2001...........................         100            0            0            0            0
                                                                                                              100          95
July 2002...........................           9            0            0            0            0
                                                                                                              100          48
July 2003...........................           0            0            0            0            0
                                                                                                               54           4
July 2004...........................           0            0            0            0            0
                                                                                                                1           0
July 2005...........................           0            0            0            0            0
                                                                                                                0           0
July 2006...........................           0            0            0            0            0
                                                                                                                0           0
July 2007...........................           0            0            0            0            0
                                                                                                                0           0
July 2008...........................           0            0            0            0            0
                                                                                                                0           0
July 2009...........................           0            0            0            0            0
                                                                                                                0           0
July 2010...........................           0            0            0            0            0
                                                                                                                0           0
July 2011...........................           0            0            0            0            0
                                                                                                                0           0
July 2012...........................           0            0            0            0            0
                                                                                                                0           0
July 2013...........................           0            0            0            0            0
                                                                                                                0           0
July 2014...........................           0            0            0            0            0
                                                                                                                0           0
July 2015...........................           0            0            0            0            0
                                                                                                                0           0
July 2016...........................           0            0            0            0            0
                                                                                                                0           0
July 2017...........................           0            0            0            0            0
                                                                                                                0           0
July 2018...........................           0            0            0            0            0
                                                                                                                0           0
July 2019...........................           0            0            0            0            0
                                                                                                                0           0
July 2020...........................           0            0            0            0            0
                                                                                                                0           0
July 2021...........................           0            0            0            0            0
                                                                                                                0           0
July 2022...........................           0            0            0            0            0
                                                                                                                0           0
July 2023...........................           0            0            0            0            0
                                                                                                                0           0
July 2024...........................           0            0            0            0            0
                                                                                                                0           0
July 2025...........................           0            0            0            0            0
                                                                                                                0           0
July 2026...........................           0            0            0            0            0
                                                                                                                0           0
Weighted Average
  Life (years) (1)..................        5.65         4.49         4.49         3.44         2.59         7.11        6.01
 
<CAPTION>
                                                                                               CLASS A-6
                                                                                          CERTIFICATES AT THE
                                                                                         FOLLOWING PERCENTAGES
                                                                                                 OF SPA
            DISTRIBUTION                                                     ----------------------------------------------
                DATE                     175%         300%         500%         0%        100%        175%         300%
<S>                                   <C>
- ------------------------------------                                         ----------------------------------------------
Initial.............................
                                             100          100          100
                                                                                   100        100         100          100
July 1997...........................
                                             100          100          100
                                                                                    97         97          89           89
July 1998...........................
                                             100          100          100
                                                                                    92         90          67           33
July 1999...........................
                                             100          100           53
                                                                                    90         90          48            0
July 2000...........................
                                             100           68            0
                                                                                    90         90          32            0
July 2001...........................
                                              95            0            0
                                                                                    90         90          19            0
July 2002...........................
                                              48            0            0
                                                                                    90         90           8            0
July 2003...........................
                                               4            0            0
                                                                                    90         90           1            0
July 2004...........................
                                               0            0            0
                                                                                    90         26           0            0
July 2005...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2006...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2007...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2008...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2009...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2010...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2011...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2012...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2013...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2014...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2015...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2016...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2017...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2018...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2019...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2020...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2021...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2022...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2023...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2024...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2025...........................
                                               0            0            0
                                                                                     0          0           0            0
July 2026...........................
                                               0            0            0
                                                                                     0          0           0            0
Weighted Average
 
  Life (years) (1)..................        6.01         4.26         3.07        7.82       7.14        3.19         1.77
 
<CAPTION>
 
            DISTRIBUTION
                DATE                     500%
- ------------------------------------
Initial.............................
 
                                             100
July 1997...........................
 
                                              89
July 1998...........................
 
                                               0
July 1999...........................
 
                                               0
July 2000...........................
 
                                               0
July 2001...........................
 
                                               0
July 2002...........................
 
                                               0
July 2003...........................
 
                                               0
July 2004...........................
 
                                               0
July 2005...........................
 
                                               0
July 2006...........................
 
                                               0
July 2007...........................
 
                                               0
July 2008...........................
 
                                               0
July 2009...........................
 
                                               0
July 2010...........................
 
                                               0
July 2011...........................
 
                                               0
July 2012...........................
 
                                               0
July 2013...........................
 
                                               0
July 2014...........................
 
                                               0
July 2015...........................
 
                                               0
July 2016...........................
 
                                               0
July 2017...........................
 
                                               0
July 2018...........................
 
                                               0
July 2019...........................
 
                                               0
July 2020...........................
 
                                               0
July 2021...........................
 
                                               0
July 2022...........................
 
                                               0
July 2023...........................
 
                                               0
July 2024...........................
 
                                               0
July 2025...........................
 
                                               0
July 2026...........................
 
                                               0
Weighted Average
 
  Life (years) (1)..................        1.46
</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).
 
                                      S-94
<PAGE>
       PERCENTAGE OF INITIAL SUBCLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                              CLASS A-8                                     CLASS A-9
                                                         CERTIFICATES AT THE                           CERTIFICATES AT THE
                                                        FOLLOWING PERCENTAGES                         FOLLOWING PERCENTAGES
                                                               OF SPA                                        OF SPA
            DISTRIBUTION              ---------------------------------------------------------  -------------------------------
                DATE                     0%        100%       175%        300%         500%         0%        100%       175%
<S>                                   <C>        <C>        <C>        <C>          <C>          <C>        <C>        <C>
- ------------------------------------  ---------------------------------------------------------  -------------------------------
Initial.............................        100        100        100         100          100
                                                                                                       100        100        100
July 1997...........................        100        100        100          76           37
                                                                                                       100        100        100
July 1998...........................        100        100        100          50            0
                                                                                                       100        100        100
July 1999...........................        100        100        100          50            0
                                                                                                       100        100        100
July 2000...........................        100        100        100          50            0
                                                                                                       100        100        100
July 2001...........................        100        100        100          39            0
                                                                                                       100        100        100
July 2002...........................        100        100        100           0            0
                                                                                                       100        100        100
July 2003...........................        100        100        100           0            0
                                                                                                       100        100        100
July 2004...........................        100        100        100           0            0
                                                                                                       100        100        100
July 2005...........................        100        100        100           0            0
                                                                                                       100        100        100
July 2006...........................        100        100        100           0            0
                                                                                                       100        100        100
July 2007...........................        100        100        100           0            0
                                                                                                       100        100        100
July 2008...........................        100        100        100           0            0
                                                                                                       100        100        100
July 2009...........................        100        100        100           0            0
                                                                                                       100        100        100
July 2010...........................        100        100         95           0            0
                                                                                                       100        100        100
July 2011...........................        100        100         73           0            0
                                                                                                       100        100        100
July 2012...........................        100        100         54           0            0
                                                                                                       100        100        100
July 2013...........................        100        100         37           0            0
                                                                                                       100        100        100
July 2014...........................        100        100         21           0            0
                                                                                                       100        100        100
July 2015...........................        100        100          8           0            0
                                                                                                       100        100        100
July 2016...........................        100         98          0           0            0
                                                                                                       100        100         93
July 2017...........................        100         77          0           0            0
                                                                                                       100        100         78
July 2018...........................        100         57          0           0            0
                                                                                                       100        100         64
July 2019...........................        100         38          0           0            0
                                                                                                       100        100         51
July 2020...........................        100         20          0           0            0
                                                                                                       100        100         41
July 2021...........................        100          3          0           0            0
                                                                                                       100        100         31
July 2022...........................        100          0          0           0            0
                                                                                                       100         80         23
July 2023...........................        100          0          0           0            0
                                                                                                       100         58         16
July 2024...........................         65          0          0           0            0
                                                                                                       100         36          9
July 2025...........................          0          0          0           0            0
                                                                                                        88         15          4
July 2026...........................          0          0          0           0            0
                                                                                                         0          0          0
Weighted Average
  Life (years) (1)..................      28.24      22.45      16.42        3.12         0.86       29.37      27.43      23.64
 
<CAPTION>
                                                                                        CLASS A-10
                                                                                    CERTIFICATES AT THE
                                                                                   FOLLOWING PERCENTAGES
                                                                                          OF SPA
            DISTRIBUTION                                      ---------------------------------------------------------------
 
                DATE                    300%        500%          0%          100%         175%         300%         500%
 
<S>                                   <C>        <C>          <C>          <C>          <C>          <C>          <C>
- ------------------------------------                          ---------------------------------------------------------------
 
Initial.............................
                                            100         100
                                                                     100          100          100          100          100
 
July 1997...........................
                                            100         100
                                                                      91           69           52           25            0
 
July 1998...........................
                                            100         100
                                                                      81           12            0            0            0
 
July 1999...........................
                                            100         100
                                                                      70            0            0            0            0
 
July 2000...........................
                                            100         100
                                                                      60            0            0            0            0
 
July 2001...........................
                                            100         100
                                                                      49            0            0            0            0
 
July 2002...........................
                                            100         100
                                                                      39            0            0            0            0
 
July 2003...........................
                                            100          98
                                                                      28            0            0            0            0
 
July 2004...........................
                                            100          60
                                                                      16            0            0            0            0
 
July 2005...........................
                                            100          39
                                                                       3            0            0            0            0
 
July 2006...........................
                                            100          27
                                                                       0            0            0            0            0
 
July 2007...........................
                                            100          18
                                                                       0            0            0            0            0
 
July 2008...........................
                                            100          12
                                                                       0            0            0            0            0
 
July 2009...........................
                                             89           8
                                                                       0            0            0            0            0
 
July 2010...........................
                                             71           6
                                                                       0            0            0            0            0
 
July 2011...........................
                                             56           4
                                                                       0            0            0            0            0
 
July 2012...........................
                                             44           3
                                                                       0            0            0            0            0
 
July 2013...........................
                                             35           2
                                                                       0            0            0            0            0
 
July 2014...........................
                                             27           1
                                                                       0            0            0            0            0
 
July 2015...........................
                                             21           1
                                                                       0            0            0            0            0
 
July 2016...........................
                                             16           1
                                                                       0            0            0            0            0
 
July 2017...........................
                                             12           *
                                                                       0            0            0            0            0
 
July 2018...........................
                                              9           *
                                                                       0            0            0            0            0
 
July 2019...........................
                                              7           *
                                                                       0            0            0            0            0
 
July 2020...........................
                                              5           *
                                                                       0            0            0            0            0
 
July 2021...........................
                                              3           *
                                                                       0            0            0            0            0
 
July 2022...........................
                                              2           *
                                                                       0            0            0            0            0
 
July 2023...........................
                                              1           *
                                                                       0            0            0            0            0
 
July 2024...........................
                                              1           *
                                                                       0            0            0            0            0
 
July 2025...........................
                                              *           *
                                                                       0            0            0            0            0
 
July 2026...........................
                                              0           0
                                                                       0            0            0            0            0
 
Weighted Average
 
  Life (years) (1)..................      16.56        9.32         4.90         1.34         1.01         0.76         0.56
 
</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.
 
                                      S-95
<PAGE>
       PERCENTAGE OF INITIAL SUBCLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                               CLASS A-11                                  CLASS A-12
                                                           CERTIFICATES AT THE                        CERTIFICATES AT THE
                                                          FOLLOWING PERCENTAGES                      FOLLOWING PERCENTAGES
                                                                 OF SPA                                      OF SPA
            DISTRIBUTION              -------------------------------------------------------------  ----------------------
                DATE                     0%         100%         175%         300%         500%         0%         100%
<S>                                   <C>        <C>          <C>          <C>          <C>          <C>        <C>
- ------------------------------------  -------------------------------------------------------------  ----------------------
Initial.............................        100         100          100          100          100
                                                                                                           100         100
July 1997...........................        100         100          100          100           80
                                                                                                           100         100
July 1998...........................        100         100           59            0            0
                                                                                                           100         100
July 1999...........................        100          37            0            0            0
                                                                                                           100         100
July 2000...........................        100           0            0            0            0
                                                                                                           100          76
July 2001...........................        100           0            0            0            0
                                                                                                           100          25
July 2002...........................        100           0            0            0            0
                                                                                                           100           0
July 2003...........................        100           0            0            0            0
                                                                                                           100           0
July 2004...........................        100           0            0            0            0
                                                                                                           100           0
July 2005...........................        100           0            0            0            0
                                                                                                           100           0
July 2006...........................         87           0            0            0            0
                                                                                                           100           0
July 2007...........................         71           0            0            0            0
                                                                                                           100           0
July 2008...........................         52           0            0            0            0
                                                                                                           100           0
July 2009...........................         32           0            0            0            0
                                                                                                           100           0
July 2010...........................         10           0            0            0            0
                                                                                                           100           0
July 2011...........................          0           0            0            0            0
                                                                                                            90           0
July 2012...........................          0           0            0            0            0
                                                                                                            69           0
July 2013...........................          0           0            0            0            0
                                                                                                            47           0
July 2014...........................          0           0            0            0            0
                                                                                                            23           0
July 2015...........................          0           0            0            0            0
                                                                                                             0           0
July 2016...........................          0           0            0            0            0
                                                                                                             0           0
July 2017...........................          0           0            0            0            0
                                                                                                             0           0
July 2018...........................          0           0            0            0            0
                                                                                                             0           0
July 2019...........................          0           0            0            0            0
                                                                                                             0           0
July 2020...........................          0           0            0            0            0
                                                                                                             0           0
July 2021...........................          0           0            0            0            0
                                                                                                             0           0
July 2022...........................          0           0            0            0            0
                                                                                                             0           0
July 2023...........................          0           0            0            0            0
                                                                                                             0           0
July 2024...........................          0           0            0            0            0
                                                                                                             0           0
July 2025...........................          0           0            0            0            0
                                                                                                             0           0
July 2026...........................          0           0            0            0            0
                                                                                                             0           0
Weighted Average
  Life (years) (1)..................      12.06        2.88         2.11         1.58         1.19       16.86        4.56
 
<CAPTION>
                                                                                                CLASS A-13
                                                                                           CERTIFICATES AT THE
                                                                                          FOLLOWING PERCENTAGES
                                                                                                  OF SPA
            DISTRIBUTION                                                     ------------------------------------------------
                DATE                     175%         300%         500%         0%         100%         175%         300%
<S>                                   <C>
- ------------------------------------                                         ------------------------------------------------
Initial.............................
                                             100          100          100
                                                                                   100         100          100          100
July 1997...........................
                                             100          100          100
                                                                                   100         100          100          100
July 1998...........................
                                             100           80            0
                                                                                   100         100          100          100
July 1999...........................
                                              55            0            0
                                                                                   100         100          100           22
July 2000...........................
                                               0            0            0
                                                                                   100         100           67            0
July 2001...........................
                                               0            0            0
                                                                                   100         100            0            0
July 2002...........................
                                               0            0            0
                                                                                   100          76            0            0
July 2003...........................
                                               0            0            0
                                                                                   100          23            0            0
July 2004...........................
                                               0            0            0
                                                                                   100           0            0            0
July 2005...........................
                                               0            0            0
                                                                                   100           0            0            0
July 2006...........................
                                               0            0            0
                                                                                   100           0            0            0
July 2007...........................
                                               0            0            0
                                                                                   100           0            0            0
July 2008...........................
                                               0            0            0
                                                                                   100           0            0            0
July 2009...........................
                                               0            0            0
                                                                                   100           0            0            0
July 2010...........................
                                               0            0            0
                                                                                   100           0            0            0
July 2011...........................
                                               0            0            0
                                                                                   100           0            0            0
July 2012...........................
                                               0            0            0
                                                                                   100           0            0            0
July 2013...........................
                                               0            0            0
                                                                                   100           0            0            0
July 2014...........................
                                               0            0            0
                                                                                   100           0            0            0
July 2015...........................
                                               0            0            0
                                                                                    96           0            0            0
July 2016...........................
                                               0            0            0
                                                                                    58           0            0            0
July 2017...........................
                                               0            0            0
                                                                                    17           0            0            0
July 2018...........................
                                               0            0            0
                                                                                     0           0            0            0
July 2019...........................
                                               0            0            0
                                                                                     0           0            0            0
July 2020...........................
                                               0            0            0
                                                                                     0           0            0            0
July 2021...........................
                                               0            0            0
                                                                                     0           0            0            0
July 2022...........................
                                               0            0            0
                                                                                     0           0            0            0
July 2023...........................
                                               0            0            0
                                                                                     0           0            0            0
July 2024...........................
                                               0            0            0
                                                                                     0           0            0            0
July 2025...........................
                                               0            0            0
                                                                                     0           0            0            0
July 2026...........................
                                               0            0            0
                                                                                     0           0            0            0
Weighted Average
 
  Life (years) (1)..................        3.11         2.25         1.69       20.23        6.54         4.21         2.88
 
<CAPTION>
 
            DISTRIBUTION
                DATE                     500%
- ------------------------------------
Initial.............................
 
                                             100
July 1997...........................
 
                                             100
July 1998...........................
 
                                              71
July 1999...........................
 
                                               0
July 2000...........................
 
                                               0
July 2001...........................
 
                                               0
July 2002...........................
 
                                               0
July 2003...........................
 
                                               0
July 2004...........................
 
                                               0
July 2005...........................
 
                                               0
July 2006...........................
 
                                               0
July 2007...........................
 
                                               0
July 2008...........................
 
                                               0
July 2009...........................
 
                                               0
July 2010...........................
 
                                               0
July 2011...........................
 
                                               0
July 2012...........................
 
                                               0
July 2013...........................
 
                                               0
July 2014...........................
 
                                               0
July 2015...........................
 
                                               0
July 2016...........................
 
                                               0
July 2017...........................
 
                                               0
July 2018...........................
 
                                               0
July 2019...........................
 
                                               0
July 2020...........................
 
                                               0
July 2021...........................
 
                                               0
July 2022...........................
 
                                               0
July 2023...........................
 
                                               0
July 2024...........................
 
                                               0
July 2025...........................
 
                                               0
July 2026...........................
 
                                               0
Weighted Average
 
  Life (years) (1)..................        2.11
</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).
 
                                      S-96
<PAGE>
       PERCENTAGE OF INITIAL SUBCLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                                                                          CLASS A-15
                                                               CLASS A-14                            CERTIFICATES AT THE
                                                           CERTIFICATES AT THE                            FOLLOWING
                                                          FOLLOWING PERCENTAGES                          PERCENTAGES
                                                                 OF SPA                                     OF SPA
            DISTRIBUTION              -------------------------------------------------------------  --------------------
                DATE                     0%         100%         175%         300%         500%         0%        100%
<S>                                   <C>        <C>          <C>          <C>          <C>          <C>        <C>
- ------------------------------------  -------------------------------------------------------------  --------------------
Initial.............................        100         100          100          100          100
                                                                                                           100        100
July 1997...........................        100         100          100          100          100
                                                                                                           100        100
July 1998...........................        100         100          100          100          100
                                                                                                           100        100
July 1999...........................        100         100          100          100            0
                                                                                                           100        100
July 2000...........................        100         100          100            0            0
                                                                                                           100        100
July 2001...........................        100         100           68            0            0
                                                                                                           100        100
July 2002...........................        100         100            0            0            0
                                                                                                           100        100
July 2003...........................        100         100            0            0            0
                                                                                                           100        100
July 2004...........................        100          73            0            0            0
                                                                                                           100        100
July 2005...........................        100          27            0            0            0
                                                                                                           100        100
July 2006...........................        100           0            0            0            0
                                                                                                           100         93
July 2007...........................        100           0            0            0            0
                                                                                                           100         74
July 2008...........................        100           0            0            0            0
                                                                                                           100         56
July 2009...........................        100           0            0            0            0
                                                                                                           100         39
July 2010...........................        100           0            0            0            0
                                                                                                           100         23
July 2011...........................        100           0            0            0            0
                                                                                                           100          8
July 2012...........................        100           0            0            0            0
                                                                                                           100          0
July 2013...........................        100           0            0            0            0
                                                                                                           100          0
July 2014...........................        100           0            0            0            0
                                                                                                           100          0
July 2015...........................        100           0            0            0            0
                                                                                                           100          0
July 2016...........................        100           0            0            0            0
                                                                                                           100          0
July 2017...........................        100           0            0            0            0
                                                                                                           100          0
July 2018...........................         70           0            0            0            0
                                                                                                           100          0
July 2019...........................         18           0            0            0            0
                                                                                                           100          0
July 2020...........................          0           0            0            0            0
                                                                                                            80          0
July 2021...........................          0           0            0            0            0
                                                                                                            49          0
July 2022...........................          0           0            0            0            0
                                                                                                            16          0
July 2023...........................          0           0            0            0            0
                                                                                                             0          0
July 2024...........................          0           0            0            0            0
                                                                                                             0          0
July 2025...........................          0           0            0            0            0
                                                                                                             0          0
July 2026...........................          0           0            0            0            0
                                                                                                             0          0
Weighted Average
  Life (years) (1)..................      22.42        8.56         5.26         3.47         2.45       24.99      12.47
 
<CAPTION>
 
                                                                                              CLASS A-16
                                                                                         CERTIFICATES AT THE
                                                                                        FOLLOWING PERCENTAGES
                                                                                                OF SPA
            DISTRIBUTION                                                     --------------------------------------------
                DATE                     175%         300%         500%         0%        100%       175%        300%
<S>                                   <C>
- ------------------------------------                                         --------------------------------------------
Initial.............................
                                             100          100          100
                                                                                   100        100        100         100
July 1997...........................
                                             100          100          100
                                                                                   100        100        100         100
July 1998...........................
                                             100          100          100
                                                                                   100        100        100         100
July 1999...........................
                                             100          100           47
                                                                                   100        100        100         100
July 2000...........................
                                             100           80            0
                                                                                   100        100        100         100
July 2001...........................
                                             100           14            0
                                                                                   100        100        100         100
July 2002...........................
                                              92            0            0
                                                                                   100        100        100          51
July 2003...........................
                                              57            0            0
                                                                                   100        100        100           0
July 2004...........................
                                              28            0            0
                                                                                   100        100        100           0
July 2005...........................
                                               4            0            0
                                                                                   100        100        100           0
July 2006...........................
                                               0            0            0
                                                                                   100        100         77           0
July 2007...........................
                                               0            0            0
                                                                                   100        100         51           0
July 2008...........................
                                               0            0            0
                                                                                   100        100         28           0
July 2009...........................
                                               0            0            0
                                                                                   100        100          8           0
July 2010...........................
                                               0            0            0
                                                                                   100        100          0           0
July 2011...........................
                                               0            0            0
                                                                                   100        100          0           0
July 2012...........................
                                               0            0            0
                                                                                   100         90          0           0
July 2013...........................
                                               0            0            0
                                                                                   100         69          0           0
July 2014...........................
                                               0            0            0
                                                                                   100         50          0           0
July 2015...........................
                                               0            0            0
                                                                                   100         31          0           0
July 2016...........................
                                               0            0            0
                                                                                   100         14          0           0
July 2017...........................
                                               0            0            0
                                                                                   100          0          0           0
July 2018...........................
                                               0            0            0
                                                                                   100          0          0           0
July 2019...........................
                                               0            0            0
                                                                                   100          0          0           0
July 2020...........................
                                               0            0            0
                                                                                   100          0          0           0
July 2021...........................
                                               0            0            0
                                                                                   100          0          0           0
July 2022...........................
                                               0            0            0
                                                                                   100          0          0           0
July 2023...........................
                                               0            0            0
                                                                                    69          0          0           0
July 2024...........................
                                               0            0            0
                                                                                     9          0          0           0
July 2025...........................
                                               0            0            0
                                                                                     0          0          0           0
July 2026...........................
                                               0            0            0
                                                                                     0          0          0           0
Weighted Average
 
  Life (years) (1)..................        7.36         4.50         3.03       27.36      18.11      11.17        6.09
 
<CAPTION>
 
            DISTRIBUTION
                DATE                     500%
- ------------------------------------
Initial.............................
 
                                             100
July 1997...........................
 
                                             100
July 1998...........................
 
                                             100
July 1999...........................
 
                                             100
July 2000...........................
 
                                              21
July 2001...........................
 
                                               0
July 2002...........................
 
                                               0
July 2003...........................
 
                                               0
July 2004...........................
 
                                               0
July 2005...........................
 
                                               0
July 2006...........................
 
                                               0
July 2007...........................
 
                                               0
July 2008...........................
 
                                               0
July 2009...........................
 
                                               0
July 2010...........................
 
                                               0
July 2011...........................
 
                                               0
July 2012...........................
 
                                               0
July 2013...........................
 
                                               0
July 2014...........................
 
                                               0
July 2015...........................
 
                                               0
July 2016...........................
 
                                               0
July 2017...........................
 
                                               0
July 2018...........................
 
                                               0
July 2019...........................
 
                                               0
July 2020...........................
 
                                               0
July 2021...........................
 
                                               0
July 2022...........................
 
                                               0
July 2023...........................
 
                                               0
July 2024...........................
 
                                               0
July 2025...........................
 
                                               0
July 2026...........................
 
                                               0
Weighted Average
 
  Life (years) (1)..................        3.82
</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).
 
                                      S-97
<PAGE>
       PERCENTAGE OF INITIAL SUBCLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                   CLASS A-17(2) AND CLASS A-18                          CLASS A-19
                                                        CERTIFICATES AT THE                          CERTIFICATES AT THE
                                                       FOLLOWING PERCENTAGES                        FOLLOWING PERCENTAGES
                                                              OF SPA                                       OF SPA
            DISTRIBUTION              -------------------------------------------------------  -------------------------------
                DATE                     0%        100%       175%       300%        500%         0%        100%       175%
<S>                                   <C>        <C>        <C>        <C>        <C>          <C>        <C>        <C>
- ------------------------------------  -------------------------------------------------------  -------------------------------
Initial.............................        100        100        100        100         100
                                                                                                     100        100        100
July 1997...........................        100        100        100        100         100
                                                                                                     100        100        100
July 1998...........................        100        100        100        100         100
                                                                                                     100        100        100
July 1999...........................        100        100        100        100         100
                                                                                                     100        100        100
July 2000...........................         99         99         99         99          99
                                                                                                     100        100        100
July 2001...........................         98         98         98         98          46
                                                                                                     100        100        100
July 2002...........................         96         96         96         96          12
                                                                                                      99         97         95
July 2003...........................         95         95         95         93           0
                                                                                                      97         93         90
July 2004...........................         94         94         94         70           0
                                                                                                      96         88         83
July 2005...........................         93         93         93         54           0
                                                                                                      94         82         74
July 2006...........................         92         92         92         43           0
                                                                                                      92         76         65
July 2007...........................         90         90         90         34           0
                                                                                                      90         70         57
July 2008...........................         89         89         89         28           0
                                                                                                      88         64         50
July 2009...........................         88         88         88         22           0
                                                                                                      85         59         43
July 2010...........................         87         87         80         18           0
                                                                                                      83         53         38
July 2011...........................         86         86         70         14           0
                                                                                                      80         48         33
July 2012...........................         84         84         60         11           0
                                                                                                      77         44         28
July 2013...........................         83         83         51          9           0
                                                                                                      74         39         24
July 2014...........................         82         82         44          7           0
                                                                                                      70         35         20
July 2015...........................         81         81         37          5           0
                                                                                                      66         31         17
July 2016...........................         80         80         31          4           0
                                                                                                      62         28         15
July 2017...........................         78         77         26          3           0
                                                                                                      58         24         12
July 2018...........................         77         66         21          2           0
                                                                                                      53         21         10
July 2019...........................         76         56         17          2           0
                                                                                                      48         18          8
July 2020...........................         75         47         14          1           0
                                                                                                      42         15          6
July 2021...........................         74         38         10          1           0
                                                                                                      36         12          5
July 2022...........................         72         29          8          1           0
                                                                                                      30          9          4
July 2023...........................         71         21          5          *           0
                                                                                                      23          7          2
July 2024...........................         70         13          3          *           0
                                                                                                      15          4          1
July 2025...........................         34          5          1          *           0
                                                                                                       7          2          1
July 2026...........................          0          0          0          0           0
                                                                                                       0          0          0
Weighted Average
  Life (years) (1)..................      24.96      22.23      17.66      10.67        5.10       21.17      15.72      13.35
 
<CAPTION>
                                                                            CLASS A-R AND CLASS A-LR
                                                                               CERTIFICATES AT THE
                                                                              FOLLOWING PERCENTAGES
                                                                                     OF SPA
            DISTRIBUTION                                      -----------------------------------------------------
                DATE                    300%        500%         0%        100%       175%       300%       500%
<S>                                   <C>        <C>          <C>        <C>        <C>        <C>        <C>
- ------------------------------------                          -----------------------------------------------------
Initial.............................
                                            100         100
                                                                    100        100        100        100        100
July 1997...........................
                                            100         100
                                                                    100        100        100        100        100
July 1998...........................
                                            100         100
                                                                    100        100        100        100        100
July 1999...........................
                                            100         100
                                                                    100        100        100        100        100
July 2000...........................
                                            100         100
                                                                    100        100        100        100        100
July 2001...........................
                                            100         100
                                                                    100        100        100        100        100
July 2002...........................
                                             93          89
                                                                    100        100        100        100        100
July 2003...........................
                                             85          65
                                                                    100        100        100        100        100
July 2004...........................
                                             74          40
                                                                    100        100        100        100        100
July 2005...........................
                                             62          26
                                                                    100        100        100        100        100
July 2006...........................
                                             50          18
                                                                    100        100        100        100        100
July 2007...........................
                                             40          12
                                                                    100        100        100        100        100
July 2008...........................
                                             32           8
                                                                    100        100        100        100        100
July 2009...........................
                                             25           6
                                                                    100        100        100        100        100
July 2010...........................
                                             20           4
                                                                    100        100        100        100        100
July 2011...........................
                                             16           3
                                                                    100        100        100        100        100
July 2012...........................
                                             13           2
                                                                    100        100        100        100        100
July 2013...........................
                                             10           1
                                                                    100        100        100        100        100
July 2014...........................
                                              8           1
                                                                    100        100        100        100        100
July 2015...........................
                                              6           1
                                                                    100        100        100        100        100
July 2016...........................
                                              5           *
                                                                    100        100        100        100        100
July 2017...........................
                                              4           *
                                                                    100        100        100        100        100
July 2018...........................
                                              3           *
                                                                    100        100        100        100        100
July 2019...........................
                                              2           *
                                                                    100        100        100        100        100
July 2020...........................
                                              1           *
                                                                    100        100        100        100        100
July 2021...........................
                                              1           *
                                                                    100        100        100        100        100
July 2022...........................
                                              1           *
                                                                    100        100        100        100        100
July 2023...........................
                                              *           *
                                                                    100        100        100        100        100
July 2024...........................
                                              *           *
                                                                    100        100        100        100        100
July 2025...........................
                                              *           *
                                                                    100        100        100        100        100
July 2026...........................
                                              0           0
                                                                      0          0          0          0          0
Weighted Average
 
  Life (years) (1)..................      11.03        8.30       30.00      29.89      29.85      29.77      29.64
</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).
(2)The  weighted average life  shown for the Class  A-17 Certificates applies to
   such Subclass taken as  a whole. As a  result of the distribution  priorities
   and allocations described herein, the weighted average life of any Class A-17
   Certificate   beneficially  owned   by  an   individual  investor   may  vary
   significantly from  the weighted  average life  of the  Subclass taken  as  a
   whole.
 *  Indicates  a percentage greater than zero but  less than 0.5% of the initial
    principal balance of such Subclass.
 
                                      S-98
<PAGE>
    Based on the assumptions set forth in  the last paragraph on page S-91,  but
assuming  that no prepayments  are experienced on the  Mortgage Loans, the final
Distribution Date for the Class A-1, Class  A-2, Class A-3, Class A-4 and  Class
A-5  Certificates  would occur  in November  1998,  April 2000,  September 2001,
September 2002 and August 2004,  respectively. Depending on the  characteristics
and performance of the Mortgage Loans, the actual final Distribution Date of the
Class  A-1, Class A-2,  Class A-3, Class  A-4 and Class  A-5 Certificates may be
earlier or  later (perhaps  substantially)  than the  date  referred to  in  the
preceding sentence.
 
    The  principal payment priorities  and principal payment  schedules for each
Subclass  of  Scheduled  Certificates  set   forth  herein  under  the   heading
"Description  of  the  Certificates  --  Principal  (Including  Prepayments)  --
Allocation of  Amount to  be Distributed"  were designed  to provide  a  certain
amount  of protection to the holders to such Subclasses against extension of the
weighted average  lives thereof  due  to constant  rates  of prepayment  on  the
Mortgage  Loans  below  175%  SPA  but above  100%  SPA.  The  principal payment
priorities and principal payment schedule for the Class A-6 Components set forth
herein  under  the  heading  "Description  of  the  Certificates  --   Principal
(Including Prepayments) -- Allocation of Amount to be Distributed" were designed
to  provide a certain amount of protection to  the holders of such the Class A-6
Certificates against  extension of  the  weighted average  life thereof  due  to
constant rates of prepayment on the Mortgage Loans below 175% SPA but above 125%
SPA.  The percentages  of the  initial Class  A Subclass  Principal Balances and
Component Principal Balances  of the  Scheduled Certificates and  the Class  A-6
Components  set forth in the tables beginning on page S-55 were calculated using
the assumptions set forth in the last paragraph on page S-91. Because, as  noted
above,  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  and because  the characteristics  of  the Mortgage  Loans ultimately
included in  the Trust  Estate and  the characteristics  which were  assumed  in
preparing  such tables are  likely to vary,  there can be  no assurance that the
principal payment priorities  and principal payment  schedules of the  Scheduled
Certificates  and the Class  A-6 Components will  provide protection against the
extension of the weighted average lives of such Subclasses and Components.
 
    THE WEIGHTED AVERAGE LIFE OF THE CLASS A-8 CERTIFICATES WILL BE PARTICULARLY
SENSITIVE TO THE  RATE OF PREPAYMENTS  ON THE MORTGAGE  LOANS. Under  relatively
fast  prepayment  scenarios, the  Class  A-8 A  Component  and the  Class  A-8 B
Component  receive  certain  distributions  in  respect  of  principal  on  each
Distribution  Date  after the  Class A-7  Accrual  Component has  been allocated
principal up to its Scheduled Amount  until the Component Principal Balances  of
the  Class A-8 A Component  and Class A-8 B Component  have been reduced to zero
before the Class A-7 Accrual Component  is allocated any principal in excess  of
its Scheduled Amount. This is intended to decrease the likelihood that the Class
A-7  Accrual Component will be allocated principal in reduction of its Component
Principal Balance on any Distribution Date in excess of its Scheduled Amount. As
such, the Class  A-8 Certificates support  the Class A-7  Accrual Component.  In
addition,  under relatively slow prepayment scenarios, the Class A-8 A Component
and the Class A-8 B Component  receive no distributions in respect of  principal
until  the Scheduled Certificates and the Class A-6 Components receive principal
payments in the amount of their Scheduled Amounts. This is intended to  increase
the likelihood that the Scheduled Certificates and the Class A-6 Components will
be allocated principal in reduction of their Class A Subclass Principal Balances
and Component Principal Balances on any Distribution Date in the amount of their
Scheduled  Principal Amounts.  As such, the  Class A-8  Certificates support the
Scheduled Certificates and the Class A-6 Components.
 
    THE CLASS  A-17 CERTIFICATES  MAY  NOT BE  APPROPRIATE INVESTMENTS  FOR  ANY
INVESTOR  WHO REQUIRES A SINGLE  LUMP SUM PAYMENT ON  A PREDETERMINED DATE OR AN
OTHERWISE PREDICTABLE STREAM OF PRINCIPAL  PAYMENTS. THERE IS NO ASSURANCE  THAT
ANY  INVESTOR  IN  A  CLASS  A-17 CERTIFICATE  WILL  RECEIVE  A  DISTRIBUTION IN
REDUCTION OF  ITS  PRINCIPAL BALANCE  ON  A PARTICULAR  DISTRIBUTION  DATE.  SEE
"DESCRIPTION OF THE CERTIFICATES -- DISTRIBUTIONS IN REDUCTION OF THE CLASS A-17
CERTIFICATES" HEREIN.
 
    Interest  accrued on the Class A 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 --
 
                                      S-99
<PAGE>
Interest"  herein. The yield on  the Class A 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  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 Underwriters 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  (vii) of the last  paragraph on page S-91  hereof.
Accordingly,  such  tables  and  other  materials  may  not  be  relevant  to or
appropriate for investors other than those specifically requesting them.
 
SENSITIVITY OF THE CLASS A-18 CERTIFICATES
 
    THE YIELD  TO AN  INVESTOR IN  THE CLASS  A-18 CERTIFICATES  WILL BE  HIGHLY
SENSITIVE  TO THE RATE AND TIMING  OF PRINCIPAL PAYMENTS (INCLUDING PREPAYMENTS)
OF THE MORTGAGE LOANS, WHICH RATE MAY FLUCTUATE SIGNIFICANTLY FROM TIME TO TIME.
AN INVESTOR SHOULD FULLY CONSIDER THE ASSOCIATED RISKS, INCLUDING THE RISK  THAT
A  RELATIVELY SLOW  RATE OF  PRINCIPAL PAYMENTS  (INCLUDING PREPAYMENTS)  ON THE
MORTGAGE LOANS WILL HAVE A  NEGATIVE EFFECT ON THE YIELD  TO AN INVESTOR IN  THE
CLASS A-18 CERTIFICATES.
 
    The following table indicates the sensitivity to various rates of prepayment
on  the Mortgage  Loans of the  pre-tax yields  to maturity on  a corporate bond
equivalent ("CBE") basis of the  Class A-18 Certificates. Such calculations  are
based on distributions made in accordance with "Description of the Certificates"
above,  on the assumptions  described in clauses  (i) through (vii)  of the last
paragraph on page S-91 and  on the further assumptions  that (i) the Class  A-18
Certificates  will be purchased on July 25,  1996 at an aggregate purchase price
of     % of the  initial Class A  Subclass Principal Balance  of the Class  A-18
Certificates  and (ii) distributions  to holders of  the Class A-18 Certificates
will be made on the 25th day of each month commencing in August 1996.
 
 SENSITIVITY OF THE PRE-TAX YIELD ON THE CLASS A-18 CERTIFICATES TO PREPAYMENTS
 
<TABLE>
<CAPTION>
                                                         PERCENTAGES OF SPA
                                --------------------------------------------------------------------
 
                                   0%        %         %         %         %         %         %
                                --------  --------  --------  --------  --------  --------  --------
<S>                             <C>       <C>       <C>       <C>       <C>       <C>       <C>
Pre-Tax Yield (CBE)...........          %         %         %         %         %         %         %
</TABLE>
 
    The pre-tax yields set forth in  the preceding table were calculated by  (i)
determining the monthly discount rates which, when applied to the assumed stream
of  cash  flows to  be  paid on  the Class  A-18  Certificates, would  cause the
discounted present  value of  such assumed  stream  of cash  flows to  equal  an
assumed   aggregate  purchase   price  for   the  Class   A-18  Certificates  of
approximately    % of their initial Class A Subclass Principal Balance and  (ii)
converting   such  monthly  rates  to  corporate  bond  equivalent  rates.  Such
calculation does not take into account the interest rates at which investors may
be able to reinvest funds  received by them as  distributions on the Class  A-18
Certificates  and consequently  does not  purport to  reflect the  return on any
investment in  the Class  A-18  Certificates when  such reinvestment  rates  are
considered.
 
    NOTWITHSTANDING  THE  ASSUMED PREPAYMENT  RATES  REFLECTED IN  THE PRECEDING
TABLE, IT IS HIGHLY UNLIKELY THAT THE  MORTGAGE LOANS WILL PREPAY AT A  CONSTANT
RATE  UNTIL MATURITY OR THAT  ALL OF THE MORTGAGE LOANS  WILL PREPAY AT THE SAME
RATE. In addition, the  actual characteristics of  the Mortgage Loans  initially
included  in the Trust Estate will  differ from those characteristics assumed in
preparing the preceding  table, and  thereafter may be  changed as  a result  of
permitted substitutions. As a result of these factors, the pre-tax yields on the
Class  A-18 Certificates are  likely to differ  from those shown  in such table,
even if all of the Mortgage Loans prepay at the indicated percentages of SPA.
 
                                     S-100
<PAGE>
                        POOLING AND SERVICING AGREEMENT
GENERAL
 
    The Series 1996-1  Certificates will  be issued  pursuant to  a Pooling  and
Servicing Agreement to be dated as of the date of initial issuance of the Series
1996-1  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 Underlying  Servicing Agreement  and the  Series
1996-1  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 Trust Administrator  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  Class
A  Certificates of each 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 Subclass of Offered  Certificates will be  made
only upon presentation and surrender of the related Certificate at the office or
agency  appointed by  the Trust Administrator  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 Trust  Administrator  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  Trust
Administrator 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
1996-1  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  1996-1 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)  and the holders of
the Class B  Certificates will collectively  be entitled to  the balance of  the
aggregate  Voting Interest  represented by  all Series  1996-1 Certificates. The
aggregate Voting Interests of each Subclass of Class A Certificates on any  date
will  be equal to the  product of (a) 99%  of the portion of  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 Subclass
less, in the case of the Class A-7 Certificates, the Component Principal Balance
of the Class A-7 PO Component on such date by the
 
                                     S-101
<PAGE>
Class  A  Non-PO Principal  Balance  on such  date.  In addition  to  the Voting
Interest of  the  Class  A-7  Certificates determined  in  accordance  with  the
preceding  sentence the Class A-7 Certificates will be entitled to an additional
1% of the Class A Voting Interest represented by clause (A) above and the  Class
A  Voting Interest represented by clause  (B) above. Each Certificateholder of a
Subclass will have a Voting Interest equal to the product of the Voting Interest
to which such Subclass is collectively  entitled and the Percentage Interest  in
such  Subclass represented  by such holder's  Certificates. With  respect to any
provisons of the Pooling and  Servicing Agreement providing for action,  consent
or  approval  of  each  Subclass  of  Certificates  or  specified  Subclasses of
Certificates, each Certificateholder of a  Subclass will have a Voting  Interest
in  such Subclass equal  to such holder's Percentage  Interest in such 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  1996-1 Certificates  will  be  Firstar  Trust
Company,  a  banking  corporation  organized  under the  laws  of  the  state of
Wisconsin. The Corporate  Trust Office  of the Trustee  is located  at 615  East
Michigan  Street,  Lewis  Center,  4th Floor,  Milwaukee,  Wisconsin  53202. 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.
 
TRUST ADMINISTRATOR
 
    First Bank National Association, a national banking association, will act as
Trust Administrator  for the  Series 1996-1  Certificates. The  corporate  trust
office of the Trust Administrator is located at 180 East Fifth Street, St. Paul,
Minnesota  55101. The  Trust Administrator  will perform  certain administrative
functions on behalf of  the Trustee and  will act as  the initial paying  agent,
certificate  registrar and custodian. In  addition, the Trust Administrator 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  Trust
Administrator  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
 
                                     S-102
<PAGE>
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.
 
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 1996-1
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 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  93.73%  (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  Trust
Administrator, 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................................................                  93.73%
FBS Mortgage Corporation.............................................                   2.13
Countrywide Funding Corporation......................................                   1.72
Barnett Mortgage Company.............................................                   1.14
National City Mortgage Company.......................................                   0.91
Bank of Hawaii.......................................................                   0.24
GMAC Mortgage Corporation of P.A.....................................                   0.09
Great Financial Federal, a Savings and Loan Association..............                   0.04
                                                                                     -------
    Total............................................................                 100.00%
                                                                                     -------
                                                                                     -------
</TABLE>
 
    Certain information with respect to the loan servicing experience of Norwest
Mortgage is set forth under "Delinquency and Foreclosure Experience."
 
                                     S-103
<PAGE>
    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 1,563 of the Mortgage  Loans in the Trust Estate, representing
approximately 73.19%  of the  Cut-Off Date  Aggregate Principal  Balance of  the
Mortgage  Loans will be Norwest Frederick-Serviced Loans and 479 of the Mortgage
Loans in the Trust Estate, representing approximately 26.81% 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
 
    Each   Underlying  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
 
                                     S-104
<PAGE>
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 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-Federick-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, require Norwest Mortgage,  as
Servicer  under the related Underlying Servicing Agreement to, or enter into and
direct the  Trustee to  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 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), without the consent
of any  Certificateholder, 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),  from
time  to time  and without  the consent of  any Certificateholder,  (i) direct a
Servicer to change the  Unscheduled Principal Receipt  Period applicable to  any
type  of Unscheduled Principal Receipt within  the parameters described below or
(ii) enter  into and  direct  the Trustee  to 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 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-105
<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.
 
SERVICING COMPENSATION AND PAYMENT OF EXPENSES
 
    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 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, as of  the
Cut-Off  Date, is expected to  be approximately 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.
 
    There will  be  no Fixed  Retained  Yield  (as defined  in  the  Prospectus)
retained  on any Mortgage  Loan. See "Servicing  of the Mortgage  Loans -- Fixed
Retained  Yield,  Servicing  Compensation  and  Payment  of  Expenses"  in   the
Prospectus  for information regarding other possible compensation to a Servicer.
The servicing fees and other expenses of the Trust Fund will be allocated to the
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  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
 
                                     S-106
<PAGE>
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) 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-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-17, Class A-18 and Class
A-19  Certificates (collectively, the "Regular Certificates"), together with the
Class A-7 Accrual Component, the  Class A-7 IO A Component,  the Class A-7 IO  B
Component,  the Class A-7 PO Component and  the Class B-1, Class B-2, Class B-3,
Class B-4, Class B-5 and Class  B-6 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.
 
    The Class A-18 Certificates will be  issued with original issue discount  in
an  amount equal  to the  excess of the  initial principal  balance thereof over
their issue price. It is anticipated that the Class A- and Class A- Certificates
will be issued with original issue discount in an amount equal to the excess  of
the  initial principal balances  of such Subclasses  over their respective issue
prices (including accrued interest).  It is further  anticipated that the  Class
A-  and Class A- Certificates will be issued  at a premium and that the Class A-
Certificates will be issued with DE MINIMIS original issue discount for  federal
income tax purposes. The Class A-7 Certificates and each Subclass of the Class B
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 175% 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
 
                                     S-107
<PAGE>
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  and  Class  A-LR  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,  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.
 
                                     S-108
<PAGE>
                              ERISA CONSIDERATIONS
 
    Neither  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.
 
    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  Plan. 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 February  22, 1991,  the  DOL issued  to  Lehman Brothers  an  individual
administrative  exemption, Prohibited Transaction Exemption  91-14, 56 Fed. Reg.
7413 (the "Lehman Brothers Exemption"), on May 24, 1990, the DOL issued to Bear,
Stearns  &  Co.   Inc.  an  individual   administrative  exemption,   Prohibited
Transaction  Exemption 90-30, 55 Fed. Reg. 21461 (the "Bear Stearns Exemption"),
and, on October 17, 1989, the DOL  issued to Salomon Brothers Inc an  individual
administrative  exemption, Prohibited Transaction Exemption  89-89, 54 Fed. Reg.
42589 (the "Salomon Brothers Exemption,"  and together with the Lehman  Brothers
Exemption  and  the  Bear  Stearns  Exemption,  the  "Exemptions"  and  each, an
"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,  other than  the  Class  A-R
Certificate, 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.
 
                                     S-109
<PAGE>
                                LEGAL INVESTMENT
 
    The  Offered  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  Offered 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 Offered Certificates, as certain Subclasses of the
Class A 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.  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 Offered  Certificates constitute  legal
investments for such investors. See "Legal Investment" in the Prospectus.
 
                                SECONDARY MARKET
 
    There  will not  be any  market for  the Offered  Certificates prior  to the
issuance  thereof.  The  Underwriters  and,  with  respect  to  the  Class  A-17
Certificates,  the  Dealer  intend  to  act  as  market  makers  in  the Offered
Certificates, subject to applicable provisions  of federal and state  securities
laws  and other regulatory requirements,  but are 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 Trust Administrator at the Corporate Trust Office.
 
                                     S-110
<PAGE>
                                  UNDERWRITING
 
    Subject to the terms and conditions  of the underwriting agreement dated  as
of  June    ,  1996 (the "Underwriting  Agreement") among  Norwest Mortgage, the
Seller and Lehman Brothers,  as representative of  the Underwriters, the  Seller
has  agreed to sell to the Underwriters, and the Underwriters have severally but
not jointly agreed to purchase from the Seller, the respective Class A  Subclass
Principal Balance (subject to a permitted variance of plus or minus 5%), of each
Subclass of the Offered Certificates set forth opposite their names below:
 
<TABLE>
<CAPTION>
                                                                      BEAR, STEARNS & CO.
SUBCLASS                                       LEHMAN BROTHERS INC.           INC.           SALOMON BROTHERS INC
- ---------------------------------------------  --------------------  ----------------------  --------------------
<S>                                            <C>                   <C>                     <C>
A-1..........................................       $                      $                      $
A-2..........................................
A-3..........................................
A-4..........................................
A-5..........................................
A-6..........................................
A-8..........................................
A-9..........................................
A-10.........................................
A-11.........................................
A-12.........................................
A-13.........................................
A-14.........................................
A-15.........................................
A-16.........................................
A-17.........................................
A-18.........................................
A-19.........................................
A-R..........................................              100                      0                      0
A-LR.........................................              100                      0                      0
    Total....................................
</TABLE>
 
    In  the  Underwriting  Agreement, the  Underwriters  have  severally agreed,
subject to  the terms  and conditions  set forth  therein, to  purchase all  the
Offered  Certificates if any Offered Certificates are purchased. In the event of
a default  by any  Underwriter,  the Underwriting  Agreement provides  that,  in
certain circumstances, purchase commitments of the nondefaulting Underwriter may
be increased or the underwriting may be terminated.
 
    The  Seller has been  advised by the  Underwriters that they  and the Dealer
propose initially to offer the Offered Certificates to the public at the  public
offering prices set forth on the cover page of this Prospectus Supplement. After
the initial public offering, the public offering prices may be changed.
 
                                     S-111
<PAGE>
    The  compensation paid to  the Underwriters varies by  Subclass as set forth
below:
 
<TABLE>
<CAPTION>
                                                                                            DISCOUNT (PERCENT OF
SUBCLASS OF OFFERED CERTIFICATES                                                        CERTIFICATE PRINCIPAL AMOUNT)
- -------------------------------------------------------------------------------------  -------------------------------
<S>                                                                                    <C>
A-1..................................................................................                     %
A-2..................................................................................
A-3..................................................................................
A-4..................................................................................
A-5..................................................................................
A-6..................................................................................
A-8..................................................................................
A-9..................................................................................
A-10.................................................................................
A-11.................................................................................
A-12.................................................................................
A-13.................................................................................
A-14.................................................................................
A-15.................................................................................
A-16.................................................................................
A-17.................................................................................
A-18.................................................................................
A-19.................................................................................
A-R..................................................................................                  (1)
A-LR.................................................................................                  (1)
</TABLE>
 
- ------------------------------
(1)  The Class  A-R  and Class  A-LR  Certificates  will be  offered  by  Lehman
     Brothers  from  time to  time in  negotiated  transactions or  otherwise at
     varying prices to be determined at the time of sale.
 
    The Underwriters and any dealers  that participate with the Underwriters  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  Underwriters  against   certain  civil  liabilities  under   the
Securities  Act or contribute to payments which the Underwriters 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, New York, New York.
 
                                    EXPERTS
 
    The  consolidated  balance sheet  of Financial  Security Assurance  Inc. and
Subsidiaries as of  December 31,  1995 and December  31, 1994,  and the  related
consolidated  statements of  income, changes  in shareholder's  equity, and cash
flows for  each of  the  three years  in the  period  ended December  31,  1995,
incorporated  by reference in this  Prospectus Supplement have been incorporated
herein, in reliance  on the  report of  Coopers &  Lybrand, L.L.P.,  independent
accountants,  given on  the authority  of that firm  as experts  in auditing and
accounting.
 
                                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 1996-1 Certificates.
 
                                     S-112
<PAGE>
                                    RATINGS
 
    It is a condition to the issuance of the Offered Certificates that they will
have been  rated "AAA"  by Fitch  Investors  Service, L.P.  ("Fitch"). It  is  a
condition to the issuance of the Offered Certificates (other than the Class A-18
Certificates)  that  they will  have  been rated  "AAA"  by Standard  and Poor's
("S&P"). It is a condition to the  issuance of the Class A-18 Certificates  that
they  will have been rated  "AAAr" by S&P. S&P  assigns the additional rating of
"r" to highlight  classes of securities  that S&P believes  may experience  high
volatility  or high variability  in expected returns due  to non-credit risks. 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 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>
Adjusted Pool Amount.....................................................................................  S-40
Adjusted Pool Amount (PO Portion)........................................................................  S-40
Adjustment Amount........................................................................................  S-70
Aggregate Current Bankruptcy Losses......................................................................  S-70
Aggregate Current Fraud Losses...........................................................................  S-70
Aggregate Current Special Hazard Losses..................................................................  S-69
Available Master Servicing Compensation..................................................................  S-40
Bankruptcy Loss..........................................................................................  S-45
Bankruptcy Loss Amount...................................................................................  S-71
Bear Stearns Exemption...................................................................................  S-109
Beneficial Owner.........................................................................................  S-33
Book-Entry Certificates..................................................................................  S-4
Bulk Purchase Underwritten Loans.........................................................................  S-16
CBE......................................................................................................  S-100
Cede.....................................................................................................  S-33
Certificate Account......................................................................................  S-107
Certificateholder........................................................................................  S-4
Certificates.............................................................................................  S-8
Class A Certificates.....................................................................................  Cover
Class A Non-PO Distribution Amount.......................................................................  S-36
Class A Non-PO Optimal Amount............................................................................  S-43
Class A Non-PO Optimal Principal Amount..................................................................  S-44
Class A Non-PO Principal Balance.........................................................................  S-39
Class A Percentage.......................................................................................  S-21
Class A Prepayment Percentage............................................................................  S-21
Class A Principal Amount.................................................................................  S-44
Class A Principal Distribution Amount....................................................................  S-44
Class A Subclass Interest Accrual Amount.................................................................  S-36
Class A Subclass Interest Shortfall Amount...............................................................  S-43
Class A Subclass Principal Balance.......................................................................  S-38
Class A Voting Interest..................................................................................  S-101
Class A-6 A Scheduled Component..........................................................................  S-2
Class A-6 B Scheduled Component..........................................................................  S-2
Class A-6 Component......................................................................................  S-2
Class A-7 Accrual Component..............................................................................  S-2
Class A-7 Accrual Component Distribution Amount..........................................................  S-44
Class A-7 Component......................................................................................  S-2
Class A-7 IO A Component.................................................................................  S-2
Class A-7 IO A Component Notional Amount.................................................................  S-38
Class A-7 IO B Component.................................................................................  S-2
Class A-7 IO B Component Notional Amount.................................................................  S-38
Class A-7 PO Component...................................................................................  S-2
Class A-7 PO Component Deferred Amount...................................................................  S-47
Class A-7 PO Component Optimal Principal Amount..........................................................  S-47
Class A-7 PO Component Principal Distribution Amount.....................................................  S-47
Class A-8 Component......................................................................................  S-2
Class A-8 A Component....................................................................................  S-2
Class A-8 B Component....................................................................................  S-2
Class A-19 Percentage....................................................................................  S-51
</TABLE>
 
                                     S-114
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Class A-19 Prepayment Shift Percentage...................................................................  S-51
Class A-19 Priority Amount...............................................................................  S-51
Class A-19 Scheduled Percentage..........................................................................  S-51
Class B Certificates.....................................................................................  Cover
Class B Percentage.......................................................................................  S-47
Class B Prepayment Percentage............................................................................  S-47
Class B Principal Balance................................................................................  S-40
Class B Subclass Interest Accrual Amount.................................................................  S-38
Class B Subclass Principal Balance.......................................................................  S-39
Closing Date.............................................................................................  S-15
Code.....................................................................................................  S-30
Compensating Interest....................................................................................  S-19
Component Interest Accrual Amount........................................................................  S-37
Component Interest Shortfall Amount......................................................................  S-43
Component Principal Balance..............................................................................  S-39
Component Rate...........................................................................................  S-37
Cooperatives.............................................................................................  S-72
Co-op Shares.............................................................................................  S-72
Cross-Over Date..........................................................................................  S-68
Curtailment Interest Shortfalls..........................................................................  S-41
Cut-Off Date Aggregate Principal Balance.................................................................  S-72
Dealer...................................................................................................  Cover
Debt Service Reduction...................................................................................  S-46
Deceased Holders.........................................................................................  S-59
Deficient Valuation......................................................................................  S-46
Definitive Certificates..................................................................................  S-13
Determination Date.......................................................................................  S-34
Discount Mortgage Loans..................................................................................  S-10
Distribution Date........................................................................................  S-2
DOL......................................................................................................  S-109
DTC......................................................................................................  S-13
Enhancement Act..........................................................................................  S-31
ERISA....................................................................................................  S-30
ERISA Plan...............................................................................................  S-109
Excess Bankruptcy Losses.................................................................................  S-70
Excess Fraud Losses......................................................................................  S-70
Excess Special Hazard Losses.............................................................................  S-69
Exchange Act.............................................................................................  S-65
Exemption................................................................................................  S-109
Exemptions...............................................................................................  S-109
Financial Security.......................................................................................  S-3
Fitch....................................................................................................  S-9
Fixed Non-relocation PHMC Portfolio Loans................................................................  S-82
Fixed PHMC Portfolio Loans...............................................................................  S-82
Fraud Loss...............................................................................................  S-45
Fraud Loss Amount........................................................................................  S-70
GEMICO...................................................................................................  S-16
Group I Certificates and Components......................................................................  S-2
Group I Percentage.......................................................................................  S-50
Group II Certificates....................................................................................  S-2
Guaranteed Distributions.................................................................................  S-63
</TABLE>
 
                                     S-115
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Holdings.................................................................................................  S-64
Individual Class A-17 Certificate........................................................................  S-59
Lehman Brothers..........................................................................................  S-20
Lehman Brothers Exemption................................................................................  S-109
Liquidated Loan..........................................................................................  S-45
Liquidated Loan Loss.....................................................................................  S-45
Living Holder............................................................................................  S-59
Lower-Tier REMIC.........................................................................................  S-4
Lower-Tier REMIC Regular Interest........................................................................  S-107
Master Servicer..........................................................................................  S-2
Master Servicing Fee.....................................................................................  S-102
Master Servicing Fee Rate................................................................................  S-102
Mid-Month Receipt Period.................................................................................  S-105
Month End Interest.......................................................................................  S-40
Moody's..................................................................................................  S-27
Mortgage Loans...........................................................................................  S-2
Mortgaged Properties.....................................................................................  S-72
Mortgages................................................................................................  S-72
NASCOR...................................................................................................  Cover
Net Foreclosure Profits..................................................................................  S-62
Net Mortgage Interest Rate...............................................................................  S-40
Net Partial Liquidation Proceeds.........................................................................  S-35
NMI Portfolio Loans......................................................................................  S-82
Non-PO Fraction..........................................................................................  S-21
Non-PO Voting Interest...................................................................................  S-101
Non-Supported Interest Shortfalls........................................................................  S-19
Norwest Bank.............................................................................................  S-2
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
Order....................................................................................................  S-63
Original Subordinated Principal Balance..................................................................  S-46
Other Servicers..........................................................................................  S-103
Partial Liquidation Proceeds.............................................................................  S-35
Pass-Through Rate........................................................................................  S-18
Percentage Interest......................................................................................  S-36
Periodic Advance.........................................................................................  S-62
PHMC.....................................................................................................  S-2
PHMC Acquisition.........................................................................................  S-74
PHMC Correspondent.......................................................................................  S-8
PHMC Portfolio Loans.....................................................................................  S-82
Plan.....................................................................................................  S-31
PO Fraction..............................................................................................  S-22
Policy...................................................................................................  S-3
Pool Balance (Non-PO Portion)............................................................................  S-11
Pool Balance (PO Portion)................................................................................  S-10
Pool Certification Underwritten Loans....................................................................  S-16
Pool Distribution Amount.................................................................................  S-34
Pool Distribution Amount Allocation......................................................................  S-35
</TABLE>
 
                                     S-116
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Pooling and Servicing Agreement..........................................................................  S-101
Premium Mortgage Loans...................................................................................  S-37
Premium Payment..........................................................................................  S-38
Premium Shortfall Amount.................................................................................  S-43
Prepayments in Full......................................................................................  S-40
Prepayment Interest Shortfalls...........................................................................  S-40
Prior Month Receipt Period...............................................................................  S-105
Prospectus...............................................................................................  S-8
PTE 83-1.................................................................................................  S-109
Realized Loss............................................................................................  S-45
Record Date..............................................................................................  S-34
Regular Certificates.....................................................................................  S-107
Relocation Mortgage Loans................................................................................  S-82
REMIC....................................................................................................  S-4
Remittance Date..........................................................................................  S-35
REO Property.............................................................................................  S-103
Reserve Fund.............................................................................................  S-3
Residual Certificate.....................................................................................  S-107
Rounding Account.........................................................................................  S-59
S&P......................................................................................................  S-9
Salomon Brothers Exemption...............................................................................  S-109
Scheduled Certificates...................................................................................  S-2
Scheduled Principal Amount...............................................................................  S-51
Scheduled Principal Balance..............................................................................  S-45
Securities Act...........................................................................................  S-109
Seller...................................................................................................  S-2
Series 1996-1 Certificates...............................................................................  Cover
Servicer.................................................................................................  S-2
Servicer Custodial Account...............................................................................  S-104
Servicing Fee Rate.......................................................................................  S-106
Similar Law..............................................................................................  S-31
SPA......................................................................................................  S-91
Special Hazard Loss......................................................................................  S-45
Special Hazard Loss Amount...............................................................................  S-70
Subclass.................................................................................................  Cover
Subsidy Account..........................................................................................  S-73
Subsidy Loan.............................................................................................  S-73
Target Regime............................................................................................  S-105
Trust Administrator......................................................................................  S-9
Trust Estate.............................................................................................  S-2
Trustee..................................................................................................  S-9
U.S. Person..............................................................................................  S-66
UGRIC....................................................................................................  S-16
Underlying Servicing Agreement...........................................................................  S-8
Underwriters.............................................................................................  Cover
Underwriting Agreement...................................................................................  S-111
Underwriting Standards...................................................................................  S-16
Unscheduled Principal Amount.............................................................................  S-51
Unscheduled Principal Receipt Period.....................................................................  S-104
Unscheduled Principal Receipts...........................................................................  S-34
Upper-Tier Certificates..................................................................................  S-107
</TABLE>
 
                                     S-117
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Upper-Tier REMIC.........................................................................................  S-4
400% SPA Targeted Balance................................................................................  S-51
175% SPA Targeted Balance................................................................................  S-51
</TABLE>
 
                                     S-118
<PAGE>
INFORMATION  CONTAINED  HEREIN  IS  SUBJECT TO  COMPLETION  OR  AMENDMENT. THESE
SECURITIES MAY NOT BE SOLD NOR MAY OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME A
FINAL PROSPECTUS IS DELIVERED. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER  TO
SELL OR THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE
SECURITIES  IN ANY  STATE IN  WHICH SUCH  OFFER, SOLICITATION  OR SALE  WOULD BE
UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY
SUCH STATE.
<PAGE>
             PROSPECTUS, SUBJECT TO COMPLETION, DATED MAY 28, 1996
                      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 JULY   , 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.
 
                                       2
<PAGE>
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 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......................................................................         34
    General................................................................................................         34
    Distributions of Interest..............................................................................         35
    Distributions of Principal.............................................................................         36
  Other Credit Enhancement.................................................................................         37
    Limited Guarantee......................................................................................         37
    Financial Guaranty Insurance Policy or Surety Bond.....................................................         37
    Letter of Credit.......................................................................................         38
    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............................................................................................         43
  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............................         48
  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.......................................................................................         55
  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..............................................................................................         59
Certain Legal Aspects of the Mortgage Loans................................................................         59
  General..................................................................................................         59
  Foreclosure..............................................................................................         60
  Foreclosure on Shares of Cooperatives....................................................................         61
  Rights of Redemption.....................................................................................         61
  Anti-Deficiency Legislation and Other Limitations on Lenders.............................................         62
</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....................................................................................         65
  Applicability of Usury Laws..............................................................................         66
  Enforceability of Certain Provisions.....................................................................         66
Certain Federal Income Tax Consequences....................................................................         66
  Federal Income Tax Consequences for REMIC Certificates...................................................         67
  General..................................................................................................         67
  Status of REMIC Certificates.............................................................................         67
  Qualification as a REMIC.................................................................................         68
  Taxation of Regular Certificates.........................................................................         69
    General................................................................................................         69
    Original Issue Discount................................................................................         70
    Acquisition Premium....................................................................................         72
    Variable Rate Regular Certificates.....................................................................         72
    Market Discount........................................................................................         74
    Premium................................................................................................         74
    Election to Treat All Interest Under the Constant Yield Method.........................................         75
    Treatment of Losses....................................................................................         75
    Sale or Exchange of Regular Certificates...............................................................         76
  Taxation of Residual Certificates........................................................................         76
    Taxation of REMIC Income...............................................................................         76
    Basis and Losses.......................................................................................         78
    Treatment of Certain Items of REMIC Income and Expense.................................................         78
    Original Issue Discount and Premium....................................................................         78
    Market Discount........................................................................................         79
    Premium................................................................................................         79
    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......................................................................................         82
    Sale or Exchange of a Residual Certificate.............................................................         82
    Mark to Market Regulations.............................................................................         83
  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...................................................................         84
  Liquidation of the REMIC Pool............................................................................         84
  Administrative Matters...................................................................................         84
  Limitations on Deduction of Certain Expenses.............................................................         84
  Taxation of Certain Foreign Investors....................................................................         85
    Regular Certificates...................................................................................         85
    Residual Certificates..................................................................................         85
  Backup Withholding.......................................................................................         86
  Reporting Requirements...................................................................................         86
</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...................................................................................         88
    Premium................................................................................................         88
    Original Issue Discount................................................................................         88
    Market Discount........................................................................................         88
    Recharacterization of Servicing Fees...................................................................         89
    Sale or Exchange of Certificates.......................................................................         89
  Stripped Certificates....................................................................................         90
    General................................................................................................         90
    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............................................................         93
  Taxation of Certain Foreign Investors....................................................................         93
ERISA Considerations.......................................................................................         93
  General..................................................................................................         93
  Certain Requirements Under ERISA.........................................................................         94
    General................................................................................................         94
    Parties in Interest/Disqualified Persons...............................................................         94
    Delegation of Fiduciary Duty...........................................................................         94
  Administrative Exemptions................................................................................         95
    Individual Administrative Exemptions...................................................................         95
    PTE 83-1...............................................................................................         96
  Exempt Plans.............................................................................................         97
  Unrelated Business Taxable Income -- Residual Certificates...............................................         97
Legal Investment...........................................................................................         97
Plan of Distribution.......................................................................................         99
Use of Proceeds............................................................................................        100
Legal Matters..............................................................................................        100
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, in lieu of  a verification of employment, employment information
may be obtained  through V.I.E., Inc.,  an affiliate of  Norwest Mortgage,  that
obtains  employment  data  from  state  unemployment  insurance  departments. 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, all borrowers applying for loans generally 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 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 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
 
                                       23
<PAGE>
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 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
 
                                       24
<PAGE>
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
 
                                       27
<PAGE>
    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;
 
          (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
 
                                       28
<PAGE>
    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;
 
          (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;
 
                                       29
<PAGE>
       (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 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
 
                                       30
<PAGE>
(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.
 
    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.
 
                                       31
<PAGE>
    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,  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
 
                                       32
<PAGE>
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 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.
 
                                       33
<PAGE>
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 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;
 
                                       34
<PAGE>
           (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;
 
           (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.
 
                                       35
<PAGE>
    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 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.
 
                                       36
<PAGE>
    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  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.
 
                                       37
<PAGE>
    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.
 
    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
 
                                       38
<PAGE>
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.
 
                      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
 
                                       39
<PAGE>
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.
 
    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,
 
                                       40
<PAGE>
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  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
 
                                       41
<PAGE>
returns; (vii) preparation of reports, if any, required under the Securities and
Exchange  Act of 1934, as 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.
 
                                       42
<PAGE>
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 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
 
                                       43
<PAGE>
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 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
 
                                       44
<PAGE>
         (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.
 
    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;
 
                                       45
<PAGE>
          (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);
 
         (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
 
                                       46
<PAGE>
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 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
 
                                       47
<PAGE>
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 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.
 
                                       48
<PAGE>
    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
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
 
                                       49
<PAGE>
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
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
 
                                       50
<PAGE>
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  and prior  to deposit  of such  payments in  the Servicer
Custodial Account or Certificate  Account for such Series  or may withdraw  from
the  Servicer Custodial  Account or Certificate  Account, or  request the Master
Servicer to  withdraw from  the Certificate  Account for  remittance to  Norwest
Mortgage as Servicer, the Fixed Retained Yield after the entire payment has been
deposited  in such account.  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 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
or  foreclosure 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. 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
 
                                       51
<PAGE>
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.
 
    Each  year the Master Servicer will review each Servicer's performance under
its Underlying  Servicing Agreement  and the  status of  any fidelity  bond  and
errors and omissions policy required to be maintained by such Servicer under the
Underlying Servicing Agreement.
 
                 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
 
                                       52
<PAGE>
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.
 
    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 is
discovered at any  time not to  be in conformance  with the representations  and
warranties  Norwest Mortgage has made to  the Seller, 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
 
                                       53
<PAGE>
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 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
 
                                       54
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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.
 
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;
 
                                       55
<PAGE>
        (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 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
 
                                       56
<PAGE>
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).
 
    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
 
                                       57
<PAGE>
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 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
 
                                       58
<PAGE>
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 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
 
                                       59
<PAGE>
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.
 
    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.
 
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<PAGE>
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.
 
    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
 
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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.
 
    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
 
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<PAGE>
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.
 
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
 
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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.
 
    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
 
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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.
 
    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
 
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<PAGE>
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 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
 
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<PAGE>
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,  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
 
                                       67
<PAGE>
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."
 
    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
 
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<PAGE>
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 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.
 
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<PAGE>
    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 (the  "OID Regulations")  and proposed
Treasury  regulations  issued   on  December   16,  1994   (the  "Proposed   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 and  the Proposed  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  and the  Proposed 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 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
 
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<PAGE>
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 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.
 
                                       71
<PAGE>
    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.
 
    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 multiple of not less than zero nor 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 includes  a
rate  determined using a single  fixed formula and that is  based on one or more
qualified floating rates or the yield or changes in the price of actively traded
personal property. The Proposed OID  Regulations would expand the definition  of
objective  rate to include 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
 
                                       72
<PAGE>
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 and the Proposed
OID  Regulations. The Proposed 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  Proposed
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.
 
    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.
 
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    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 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
 
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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.
 
    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
 
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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 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
 
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<PAGE>
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
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.
 
                                       77
<PAGE>
    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.
 
    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."
 
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<PAGE>
    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.
 
    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
 
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<PAGE>
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.
 
    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
 
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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
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
 
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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.
 
    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
 
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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.
 
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.
 
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<PAGE>
    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  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
 
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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 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)
 
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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 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
 
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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 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
 
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    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.
 
    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
 
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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  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
 
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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 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
 
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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. 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.
 
    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.
 
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    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 and the Proposed OID  Regulations. The Proposed 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 Proposed 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.
 
    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
 
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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 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,
 
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<PAGE>
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 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,
 
                                       94
<PAGE>
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;
 
       (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.
 
                                       95
<PAGE>
    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.
 
    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
 
                                       96
<PAGE>
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.
 
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,
 
                                       97
<PAGE>
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.
 
    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.
 
                                       98
<PAGE>
                              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  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
 
                                       99
<PAGE>
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.
 
                                     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
Proposed OID Regulations.................................................................................         70
PTE 83-1.................................................................................................         96
Qualified Mortgage.......................................................................................         30
Rating Agency............................................................................................         12
Record Date..............................................................................................         10
</TABLE>
 
                                      102
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
Regular Certificateholder................................................................................         69
<S>                                                                                                        <C>
Regular Certificates.....................................................................................         31
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 REPRESENTATIONS  NOT CONTAINED  IN THIS  PROSPECTUS
SUPPLEMENT  OR  THE  PROSPECTUS  AND,  IF GIVEN  OR  MADE,  SUCH  INFORMATION OR
REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE  SELLER
OR  THE  UNDERWRITERS.  THIS PROSPECTUS  SUPPLEMENT  AND THE  PROSPECTUS  DO NOT
CONSTITUTE 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 OR  SOLICITATION IN SUCH JURISDICTION. THE  DELIVERY
OF THIS PROSPECTUS SUPPLEMENT AND THE PROSPECTUS AT ANY TIME DOES NOT IMPLY THAT
INFORMATION  CONTAINED HEREIN IS CORRECT  AS OF ANY TIME  SUBSEQUENT TO THE DATE
HEREOF.
 
                            ------------------------
 
                                     INDEX
 
                             PROSPECTUS SUPPLEMENT
 
<TABLE>
<CAPTION>
                                                      Page
                                                    ---------
<S>                                                 <C>
Table of Contents.................................        S-6
Summary Information...............................        S-8
Risk Factors......................................       S-32
Description of the Certificates...................       S-33
Description of Mortgage Loans.....................       S-72
Delinquency and Foreclosure
  Experience......................................       S-82
Prepayment and Yield Considerations...............       S-88
Pooling and Servicing Agreement...................      S-101
Servicing of the Mortgage Loans...................      S-103
Federal Income Tax Considerations.................      S-106
ERISA Considerations..............................      S-109
Legal Investment..................................      S-110
Secondary Market..................................      S-110
Underwriting......................................      S-111
Legal Matters.....................................      S-112
Experts...........................................      S-112
Use of Proceeds...................................      S-112
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..............................         99
Use of Proceeds...................................        100
Legal Matters.....................................        100
Rating............................................        100
Index of Significant Definitions..................        101
</TABLE>
 
                                  $373,217,000
                                 (APPROXIMATE)
 
                                 NORWEST ASSET
                             SECURITIES CORPORATION
                                   ("NASCOR")
                                     SELLER
 
                      MORTGAGE PASS-THROUGH CERTIFICATES,
                                 SERIES 1996-1
 
                            ------------------------
 
                             PROSPECTUS SUPPLEMENT
                              -------------------
 
                                LEHMAN BROTHERS
 
                            BEAR, STEARNS & CO. INC.
 
                              SALOMON BROTHERS INC
 
                                  EDWARD JONES
 
                                 July   , 1996
 
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