NORWEST CORP
424B5, 1996-07-17
NATIONAL COMMERCIAL BANKS
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<PAGE>
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED JULY 16, 1996)
                                                                          [LOGO]
                           $408,871,000 (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(3)  Seller(2)(4)
<S>                                      <C>               <C>             <C>          <C>          <C>
Class A-1..............................    $ 30,936,000          6.700%    $30,863,486   $  61,872   $30,801,614
Class A-2..............................    $ 24,555,000          7.000%    $24,501,298   $  49,110   $24,452,188
Class A-3..............................    $ 29,100,000          7.200%    $28,995,415   $  58,200   $28,937,215
Class A-4..............................    $ 20,993,000          7.375%    $20,938,838   $  41,986   $20,896,852
Class A-5..............................    $ 48,393,000          7.500%    $48,098,093   $ 120,983   $47,977,110
Class A-6..............................    $ 27,634,000          7.500%    $27,245,411   $  55,268   $27,190,143
Class A-8..............................    $ 15,230,000          7.500%    $13,981,338   $  38,075   $13,943,263
Class A-9..............................    $ 10,156,000          8.500%    $ 9,323,340   $  25,390   $ 9,297,950
Class A-10.............................    $ 20,312,000          7.000%    $18,646,680   $  50,780   $18,595,900
Class A-11.............................    $ 28,499,800          7.500%    $26,090,683   $  71,250   $26,019,433
Class A-12.............................    $ 13,820,000          7.500%    $13,852,394   $  27,640   $13,824,754
Class A-13.............................    $ 56,764,000          7.500%    $56,173,087   $ 113,528   $56,059,559
Class A-14.............................    $ 24,475,000          7.500%    $23,419,516   $  48,950   $23,370,566
Class A-15.............................    $ 12,003,000          7.500%    $11,299,696   $  30,008   $11,269,688
Class A-16.............................    $  4,000,000          7.750%        (5)          N/A      $ 3,813,748
Class A-17.............................  $      449,000         (6)            (5)          N/A      $   177,355
Class A-18.............................  $   16,000,000          7.500   % $15,265,008  $   40,000   $15,225,008
Class A-19.............................  $   25,551,000          7.500   %     (5)          N/A      $23,782,385
Class A-R..............................  $          100          7.500   %     (5)          N/A          (5)
Class A-LR.............................  $          100          7.500   %     (5)          N/A          (5)
    Total..............................  $  408,871,000         N/A        $368,694,283 $  833,040   $395,634,731
</TABLE>
 
(1) Approximate.  The  initial  Subclass  Principal  Balances  are  subject   to
    adjustment as described herein.
(2) Approximate.  Plus accrued interest from July 1, 1996 to (but not including)
    July 25, 1996.
(3) Approximate.
(4) Before deducting expenses payable by the Seller estimated to be $860,000.
(5) The  Class  A-16,  Class  A-17,  Class  A-19,  Class  A-R  and  Class   A-LR
    Certificates  will be offered by Lehman Brothers Inc. and the Class A-16 and
    Class A-19 Certificates will also be offered  by Edward D. Jones & Co.  (the
    "Dealer")  from  time to  time in  negotiated  transactions or  otherwise at
    varying prices to be  determined at the  time of sale.  The Seller will  not
    receive  any  proceeds  with  respect  to  the  Class  A-R  and  Class  A-LR
    Certificates.
(6) The Class A-17 Certificates are principal-only certificates and will not  be
    entitled to distributions in respect of interest.
                          ---------------------------
    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-16, Class A-17, Class A-19,
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-16, Class A-17, Class  A-19, Class A-R and  Class A-LR Certificates are
offered by Lehman Brothers Inc. and  the Class A-16 and Class A-19  Certificates
are  also offered by 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-17, 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 D. JONES & CO.
 
JULY 16, 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, Class A-8,  Class A-9 and Class  A-10 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"). The Class  A-9 Certificates will be deemed to  consist
of  two components (each  a "Class A-9 Component"  and, individually, the "Class
A-9 A Component" and the "Class  A-9 B Component"). The Class A-10  Certificates
will  be deemed to consist of two components (each a "Class A-10 Component" and,
individually, the "Class A-10  A Component" and the  "Class A-10 B  Component").
Each  Class A-6 Component,  Class A-7 Component, Class  A-8 Component, Class A-9
Component and Class A-10 Component is also referred to herein as a  "Component."
THE  BENEFICIAL OWNER OF A  CLASS A-6, CLASS A-7, CLASS  A-8, CLASS A-9 OR CLASS
A-10 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, the Class A-9  Components, the Class  A-10
Components  and  the  Class A-11,  Class  A-R  and Class  A-LR  Certificates are
referred to herein collectively  as the "Group  I Certificates and  Components."
The  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
 
                                      S-2
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
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-17 Certificates) will 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-16 and  Class A-19 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-16 and Class A-19 Certificates will
also each  be entitled  to  the benefit  of  an irrevocable  financial  guaranty
insurance  policy (together,  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-16 or Class A-19
Certificates.  See "Description  of the  Certificates --  The Financial Guaranty
Insurance Policies" herein.  Once the  Reserve Fund  has been  reduced to  zero,
Non-Supported  Interest Shortfalls  allocated to  the Class  A-16 or  Class A-19
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 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-16 and Class A-19 Certificates, will be made pro rata among Certificateholders
of such Subclass. On any Distribution Date on which the Class A-16 or Class A-19
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 Certificates of such Subclass 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 applicable  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-16  and Class A-19
Certificates will be made pro rata among the holders of the Class A-16 and Class
A-19  Certificates,  respectively.  See  "Description  of  the  Certificates  --
Distributions  in Reduction  of the  Class A  Subclass Principal  Balance of the
Class A-16 and Class A-19 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-16  and  Class  A-19  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
 
                                      S-3
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
 
    - 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-17  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. SEE "DESCRIPTION OF
THE CERTIFICATES  --  INTEREST,"  "--  PRINCIPAL  (INCLUDING  PREPAYMENTS)"  AND
"PREPAYMENT AND YIELD CONSIDERATIONS" HEREIN AND IN THE PROSPECTUS.
 
    THE  WEIGHTED  AVERAGE LIVES  OF THE  CLASS  A-8, CLASS  A-9 AND  CLASS A-10
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-17, 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-16  and  Class   A-19
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
 
                                      S-4
<PAGE>
(CONTINUED FROM PREVIOUS PAGE)
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
16, 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.
 
    THIS PROSPECTUS  SUPPLEMENT  AND THE  PROSPECTUS  CONTAIN CHANGES  FROM  AND
SUPERCEDE  THE PRELIMINARY PROSPECTUS SUPPLEMENT  AND PROSPECTUS EACH DATED JUNE
10, 1996.
 
    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-16,  CLASS A-17, CLASS A-19, 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 16, 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-16 and Class A-19
   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-16 and Class A-19
   Certificates..........................................................................................       S-60
    General..............................................................................................       S-60
    Priority of Requested Distributions..................................................................       S-61
    Procedure for Requested Distributions................................................................       S-62
    Mandatory Distributions of Principal on Class A-16 and Class A-19 Certificates.......................       S-62
  Additional Rights of the Class A-R and Class A-LR Certificateholders...................................       S-63
  Periodic Advances......................................................................................       S-63
  The Financial Guaranty Insurance Policies..............................................................       S-64
  Financial Security Assurance Inc.......................................................................       S-65
  Restrictions on Transfer of the Class A-R and Class A-LR Certificates..................................       S-67
  Reports................................................................................................       S-68
  Subordination of Class B Certificates..................................................................       S-68
    Allocation of Losses.................................................................................       S-69
Description of the Mortgage Loans........................................................................       S-73
  General................................................................................................       S-73
  Mortgage Loan Data.....................................................................................       S-76
  Mandatory Repurchase or Substitution of Mortgage Loans.................................................       S-82
  Optional Repurchase of Defaulted Mortgage Loans........................................................       S-83
Delinquency and Foreclosure Experience...................................................................       S-83
Prepayment and Yield Considerations......................................................................       S-89
  Sensitivity of the Class A-17 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-104
  Servicer Custodial Accounts............................................................................      S-104
  Unscheduled Principal Receipts.........................................................................      S-105
  Anticipated Changes in Servicing.......................................................................      S-105
  Servicing Compensation and Payment of Expenses.........................................................      S-106
  Servicer Defaults......................................................................................      S-107
Federal Income Tax Considerations........................................................................      S-107
  Regular Certificates...................................................................................      S-108
  Residual Certificates..................................................................................      S-108
ERISA Considerations.....................................................................................      S-109
Legal Investment.........................................................................................      S-110
Secondary Market.........................................................................................      S-111
Underwriting.............................................................................................      S-112
Legal Matters............................................................................................      S-113
Experts..................................................................................................      S-113
Use of Proceeds..........................................................................................      S-113
Ratings..................................................................................................      S-114
Index of Significant Prospectus Supplement Definitions...................................................      S-115
</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-17 Certificates,  that they  shall have  been
                                  rated  "AAA"  by  Standard  and Poor's  ("S&P").  It  is a
                                  condition to the issuance  of the Class A-17  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
                                  "Ratings" 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
                                  1.39% interest by principal balance of the Mortgage  Loans
                                  (the "Pool Balance (PO Portion)") and an approximate 4.02%
                                  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 93.92% (approximately
                                  $560,798,000) undivided interest in the initial Pool  Bal-
                                  ance  (Non-PO Portion)  and the Class  B Certificates will
                                  evidence   in   the   aggregate   an   approximate   6.08%
                                  (approximately  $36,335,059)  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, Class  A-8,
                                  Class  A-9 and Class A-10 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 components of  the Class A-9
                                  Certificates are referred  to herein as  the "Class A-9  A
                                  Component"   and   the  "Class   A-9  B   Component"  and,
                                  collectively,  as   the   "Class  A-9   Components."   The
                                  components  of the Class A-10 Certificates are referred to
                                  herein as the "Class A-10 A Component" and the "Class A-10
                                  B  Component"  and,  collectively,  as  the  "Class   A-10
                                  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
</TABLE>
 
                                      S-11
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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  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........................................          $       2,409,000                 (1)
Class A-6 B Component........................................          $      25,225,000                 (1)
Class A-7 Accrual Component..................................          $     151,927,000                  7.50%
Class A-7 PO Component.......................................          $       8,443,821                 (2)
Class A-7 IO A Component.....................................                 (3)                         7.50%
Class A-7 IO B Component.....................................                 (4)                      (5)
Class A-8 A Component........................................  $                 7,615,000             (1)
Class A-8 B Component........................................  $                 7,615,000             (1)
Class A-9 A Component........................................  $                 5,078,000             (6)
Class A-9 B Component........................................  $                 5,078,000             (6)
Class A-10 A Component.......................................  $                10,156,000             (7)
Class A-10 B Component.......................................  $                10,156,000             (7)
</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 principal 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 $6,450,723).
 
(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 $395,402,438).
 
(5)  Interest  will accrue on  the Class A-7  IO B Component  as described under
     "Description  of  the   Certificates  --  Interest"   in  this   Prospectus
     Supplement.
 
(6)  The  Class A-9 Certificates accrue interest at  the rate of 8.50% per annum
     on  the  sum  of  the  component  principal  balances  of  the  Class   A-9
     Certificates.
 
(7)  The  Class A-10 Certificates accrue interest at the rate of 7.00% per annum
     on  the  sum  of  the  component  principal  balances  of  the  Class  A-10
     Certificates.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                               <C>
                                  The  principal balances of the Class A-6, Class A-7, Class
                                  A-8, Class A-9 and Class A-10 Certificates will equal  the
                                  sum  of component  principal balances  of their respective
                                  components. The holder  of a Class  A-6, Class A-7,  Class
                                  A-8,  Class A-9 or Class A-10  Certificate will not have a
                                  severable interest  in  any  component but  will  have  an
                                  undivided interest in the entire Subclass.
</TABLE>
 
                                      S-12
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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, the Class  A-9 Components,  the
                                  Class  A-10 Components and  the Class A-11,  Class A-R and
                                  Class   A-LR   Certificates   are   referred   to   herein
                                  collectively as the "Group I Certificates and Components."
                                  The  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-16 and Class A-19 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.
                                  See "Description of the Certificates -- Interest" in  this
                                  Prospectus  Supplement.  The  Class  A-16  and  Class A-19
                                  Certificates will also each be entitled to the benefit  of
                                  an   irrevocable   financial  guaranty   insurance  policy
                                  (together,  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-16  and Class A-19
                                  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-16 or  Class
                                  A-19 Certificates. See "Description of the Certificates --
                                  The   Financial  Guaranty  Insurance   Policies"  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-11*, A-12, A-13, A-14
 and A-15.................................................  Book-Entry                $    25,000     $   1,000
Classes A-6, A-8, A-9, A-10 and A-18......................  Book-Entry                $   100,000     $   1,000
Classes A-16 and A-19.....................................  Book-Entry                $     1,000     $   1,000
Class A-17................................................  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-11
     Certificates, one of  the Class  A-11 Certificates  will be  issued in  any
     denomination in excess of $25,000 initial principal balance.
 
                                      S-13
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    BOOK-ENTRY  FORM. The  Offered Certificates,  other than
                                    the Class A-17, 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
                                    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-17,  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>
 
                                      S-14
<PAGE>
SELECTED MORTGAGE LOAN DATA(1)
(AS OF THE CUT-OFF DATE)
 
<TABLE>
<S>                                                               <C>
Cut-Off Date:                                                     July 1, 1996
Number of Mortgage Loans:                                         2,219
Aggregate Unpaid Principal Balance(2):                            $605,576,880
Range of Unpaid Principal Balances(2):                            $19,957 to $1,951,167
Average Unpaid Principal Balance(2):                              $272,905
Range of Mortgage Interest Rates:                                 6.250% to 9.750%
Weighted Average Mortgage Interest Rate(2):                       8.030%
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):                 76.04%
Geographic Concentration of Mortgaged Properties
 Securing Mortgage Loans in Excess of 5% of the
 Aggregate Unpaid Principal Balance(2):                           California         34.94%
                                                                  New York          9.60%
                                                                  New Jersey        7.39%
Maximum Five-Digit Zip Code Concentration(2):                     0.88%
</TABLE>
 
- ------------------------------
(1)  Information concerning  the Discount  Mortgage Loans  and Premium  Mortgage
     Loans is set forth under "Description of the Mortgage Loans -- General."
 
(2)  Approximate.
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                               <C>
                                  PHMC  ACQUISITION.  On May 7, 1996 Norwest Mortgage and an
                                  affiliate acquired from PHMC certain mortgage loans and  a
                                  substantial portion of PHMC's mortgage servicing portfolio
                                  (such  transaction the  "PHMC Acquisition").  The Mortgage
                                  Loans included in the Trust Estate consist of (i) Mortgage
                                  Loans originated by  Norwest Mortgage or  an affiliate  or
                                  purchased   by  Norwest  Mortgage  or  an  affiliate  from
                                  originators  other  than  PHMC  and  (ii)  Mortgage  Loans
                                  originated  or purchased  by PHMC and  acquired by Norwest
                                  Mortgage or an  affiliate from  PHMC as part  of the  PHMC
                                  Acquisition. See "Norwest Mortgage" in the prospectus.
                                  CHANGES  TO POOL.  Mortgage Loans  may be removed from the
                                  pool, or a substitution may  be made for certain  Mortgage
                                  Loans,  in advance  of the  issuance of  the Series 1996-1
                                  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
</TABLE>
 
                                      S-15
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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  97.25% (by Cut-Off Date Aggregate Principal
                                  Balance) of the Mortgage  Loans were generally  originated
                                  in conformity with the underwriting standards described in
                                  the  Prospectus  under  the  heading  "The  Mortgage  Loan
                                  Programs -- Mortgage Loan Underwriting -- Norwest Mortgage
                                  Underwriting" (the "Underwriting  Standards"). In  certain
                                  instances,  exceptions to  the Underwriting  Standards may
                                  have been granted  by Norwest Mortgage  or PHMC. See  "The
                                  Mortgage  Loan Programs --  Mortgage Loan Underwriting" in
                                  the Prospectus. Approximately 0.04% and 0.82% (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 1.89% (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
</TABLE>
 
                                      S-16
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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 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 pay the principal due to 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
</TABLE>
 
                                      S-17
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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-16 or Class A-19 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 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-17 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-17
                                  Certificates will not
</TABLE>
 
                                      S-18
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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 and Class A-4 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 and Class
                                  A-4 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-17  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 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 sum of
                                  the  outstanding principal balances of  the Class A-16 and
                                  Class   A-19   Certificates,   less   (B)   a   pro   rata
</TABLE>
 
                                      S-19
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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 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-16  and  Class  A-19  Certificates  that  are
                                  covered  by the Reserve Fund and will not cover any losses
                                  with respect to any  other Subclass of Certificates.  Once
                                  the  Reserve Fund has been  reduced to zero, Non-Supported
                                  Interest Shortfalls allocated to  the Class A-16 or  Class
                                  A-19  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-16  and  Class A-19  Certificates  against Non-Supported
                                  Interest Shortfalls, the Reserve Fund will be  established
                                  for the Class A-16 and Class A-19 Certificates at the time
                                  of   issuance   of  such   Certificates.  At   such  time,
                                  approximately $2,000 will  be deposited  into the  Reserve
                                  Fund.  No additional  amounts will  be deposited  into the
                                  Reserve Fund  after  the  initial  deposit.  If  any  Non-
</TABLE>
 
                                      S-20
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Supported  Interest  Shortfall is  allocated to  the Class
                                  A-16 or  Class  A-19  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  Certificates  of such  Subclass  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-16 and Class A-19
                                  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 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 A-16 and Class A-19 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
</TABLE>
 
                                      S-21
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<S>                               <C>
                                  "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 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
</TABLE>
 
                                      S-22
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<S>                               <C>
                                  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-16  and  Class  A-19
                                  Certificates" in this Prospectus Supplement.
Distributions of Principal with
 Respect to the Class A-16 and
 Class A-19 Certificates........  The receipt by  any beneficial  owner of a  Class A-16  or
                                  Class  A-19 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-16  and Class  A-19  Certificates  are
                                  subject.
                                  Authorized representatives of Deceased Holders (as defined
                                  on  page S-60 of this  Prospectus Supplement) of the Class
                                  A-16 and Class  A-19 Certificates and  Living Holders  (as
                                  defined on page S-60 of this Prospectus Supplement) of the
                                  Class  A-16 and Class A-19  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
</TABLE>
 
                                      S-23
<PAGE>
 
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<S>                               <C>
                                  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
                                  Certificates of such Subclass 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 Certificates of such Subclass, 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 re-
                                  spect 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-16 or Class A-19
                                  Certificates on any Distribution Date exceeds all requests
                                  for distribution of  principal on  such Subclass,  certain
                                  holders  of  Certificates  of such  Subclass  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-16 and Class A-19  Certificates (including amounts  paid
                                  in  respect of such losses under  the Policy) will be made
                                  pro rata among  the holders  of the Class  A-16 and  Class
                                  A-19 Certificates.
                                  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-16
                                  or Class  A-19 Certificates,  as applicable,  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  Certificates
                                  of  such Subclass who have not requested a distribution of
                                  principal  on   their   Certificates  will   not   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 Certificates of such Subclass.
                                  For a further discussion of the procedures, priorities and
                                  limitations applicable to the distribution of principal to
                                  the   Class   A-16  and   Class  A-19   Certificates,  see
                                  "Description  of  the  Certificates  --  Distributions  in
                                  Reduction of the Class A Subclass Principal Balance of the
                                  Class A-16 and Class A-19 Certificates" in this Prospectus
                                  Supplement.
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                                      S-24
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<S>                               <C>
                                  THE  CLASS  A-16 AND  CLASS A-19  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-16 OR CLASS
                                  A-19  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 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
</TABLE>
 
                                      S-25
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<S>                               <C>
                                  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  $36,335,059)  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-16  and  Class  A-19
                                  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  Balance of the Mortgage
                                  Loans (approximately $6,055,769, $12,111,538 and $228,460,
                                  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-16  and
                                  Class  A-19 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
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                                      S-26
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<S>                               <C>
                                  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  lesser  of the  then-outstanding  component principal
                                  balance of the Class A-7 Accrual Component or the  initial
                                  component  principal  balance  of  the  Class  A-7 Accrual
                                  Component. 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-16 and Class A-19 Certificates.
                                  FINANCIAL GUARANTY INSURANCE  POLICY.  Financial  Security
                                  will  issue the Policy as  a means of providing additional
                                  credit enhancement  to  the  Class  A-16  and  Class  A-19
                                  Certificates  only. Under  the Policy,  Financial Security
                                  will pay  the  Trust  Administrator, for  the  benefit  of
                                  holders of Class A-16 and Class A-19 Certificates, on each
                                  Distribution  Date, (i) the excess,  if any, of the amount
                                  of interest accrued with respect to each of the Class A-16
                                  and Class  A-19  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-16  and Class A-19 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  Guar-
                                  anty   Insurance  Policies"  and  "--  Financial  Security
                                  Assurance Inc." in this  Prospectus Supplement. A copy  of
                                  the  Policy may  be obtained from  the Trust Administrator
                                  upon request.
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
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                                      S-27
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<TABLE>
<S>                               <C>
                                  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 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-17 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-17 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-17 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  AND SHOULD  CONSIDER THE
</TABLE>
 
                                      S-28
<PAGE>
 
<TABLE>
<S>                               <C>
                                  RISK THAT  A  RAPID  RATE OF  PRINCIPAL  PAYMENTS  ON  THE
                                  MORTGAGE  LOANS  COULD  RESULT  IN  THE  FAILURE  OF  SUCH
                                  INVESTOR TO FULLY RECOVER ITS INITIAL INVESTMENT.
                                  REINVESTMENT  RISK.    As  stated  above,  if  an  Offered
                                  Certificate  is purchased at par, fluctuations in the rate
                                  of distributions of  principal will  generally not  affect
                                  the  yield to  maturity of that  Certificate. However, the
                                  total return on  any investor's  investment, including  an
                                  investor  who  purchases at  par, will  be reduced  to the
                                  extent  that  principal  distributions  received  on   its
                                  Certificate  cannot be reinvested at a rate as high as the
                                  stated interest rate of the Certificate or, in the case of
                                  the Class A-17 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 avail-
                                  able  to  an  investor   for  reinvestment  at  such   low
                                  prevailing   interest  rates  may   be  relatively  large.
                                  Conversely, slow  rates  of prepayments  on  the  Mortgage
                                  Loans  may coincide with periods of high prevailing market
                                  interest rates.  During such  periods, it  is less  likely
                                  that mortgagors will elect to prepay 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
</TABLE>
 
                                      S-29
<PAGE>
 
<TABLE>
<S>                               <C>
                                  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 LIVES OF THE CLASS A-8, CLASS A-9 AND
                                  CLASS A-10 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 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 Certifi-
                                  cates will  constitute  the  "residual  interest"  in  the
                                  Upper-Tier REMIC and Lower-Tier REMIC, respectively.
                                  The  Regular  Certificates (as  defined  herein) generally
                                  will be treated as  newly originated debt instruments  for
                                  federal  income  tax  purposes. Beneficial  owners  of the
                                  Regular Certificates  will be  required to  report  income
                                  thereon   in  accordance   with  the   accrual  method  of
                                  accounting. The  Class A-17  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-6,  Class
                                  A-8,  Class A-9, Class A-10, Class A-11, Class A-14, Class
                                  A-15 and  Class  A-18  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  (including  accrued interest).  It  is also
                                  anticipated that  the Class  A-1,  Class A-2,  Class  A-3,
                                  Class  A-4, Class A-12 and Class A-16 Certificates will be
                                  issued at a premium and that the Class A-5, Class A-13 and
                                  Class A-19  Certificates will  be issued  with DE  MINIMIS
                                  original  issue discount for  federal income tax purposes.
                                  It is further anticipated that  the Class A-7, Class  B-1,
</TABLE>
 
                                      S-30
<PAGE>
 
<TABLE>
<S>                               <C>
                                  Class  B-2, Class B-3, Class B-4,  Class B-5 and Class B-6
                                  Certificates, which are not offered hereby, will be issued
                                  with  original  issue  discount  for  federal  income  tax
                                  purposes.
                                  Holders  of the Class A-R and Class A-LR Certificates will
                                  be required to include the  taxable income or loss of  the
                                  Upper-Tier  REMIC and  Lower-Tier REMIC,  respectively, in
                                  determining  their   federal   taxable   income.   It   is
                                  anticipated  that  all  or a  substantial  portion  of the
                                  taxable income  of  the Upper-Tier  REMIC  and  Lower-Tier
                                  REMIC   includible  by  the  Class   A-R  and  Class  A-LR
                                  Certificateholders will be  treated as "excess  inclusion"
                                  income  subject to special  limitations for federal income
                                  tax purposes. AS A RESULT, THE EFFECTIVE AFTER-TAX  RETURN
                                  OF  THE  CLASS  A-R  AND CLASS  A-LR  CERTIFICATES  MAY BE
                                  SIGNIFICANTLY LOWER THAN  WOULD BE THE  CASE IF THE  CLASS
                                  A-R  AND  CLASS  A-LR  CERTIFICATES  WERE  TAXED  AS  DEBT
                                  INSTRUMENTS, OR  MAY  BE  NEGATIVE.  FURTHER,  SIGNIFICANT
                                  RESTRICTIONS  APPLY TO THE  TRANSFER OF THE  CLASS A-R AND
                                  CLASS A-LR  CERTIFICATES. THE  CLASS  A-R AND  CLASS  A-LR
                                  CERTIFICATES  WILL  BE  CONSIDERED  "NONECONOMIC  RESIDUAL
                                  INTERESTS," CERTAIN TRANSFERS OF WHICH MAY BE  DISREGARDED
                                  FOR FEDERAL INCOME TAX PURPOSES.
                                  See  "Description of  the Certificates  -- Restrictions on
                                  Transfer of the Class A-R 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 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  permissible  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-17 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-16 AND CLASS A-19 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-16 and  Class A-19 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-16 or Class A-19 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-16 or Class A-19 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
 
                                      S-32
<PAGE>
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.
 
                        DESCRIPTION OF THE CERTIFICATES
 
DENOMINATIONS
 
    The Offered Certificates, other  than the Class A-6,  Class A-8, Class  A-9,
Class  A-10, Class A-11, Class  A-16, 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-6, Class A-8, Class A-9,  Class
A-10,  Class  A-17  and  Class  A-18  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-11 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-11 Certificates  may be issued  in any denomination  in
excess  of  $25,000 initial  principal balance.  The Class  A-16 and  Class A-19
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-17, 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's entitlement thereto, on the 25th  day of each month or, if such
day  is  not  a  business  day,   on  the  succeeding  business  day  (each,   a
 
                                      S-33
<PAGE>
"Distribution  Date"), beginning in  August 1996. The  "Determination Date" with
respect to each Distribution Date will be the 17th day of each month, or if such
day is not  a business day,  the preceding business  day. Distributions will  be
made  on each Distribution Date to holders of  record (which, in the case of the
Book-Entry Certificates,  will be  Cede, as  nominee for  DTC) at  the close  of
business  on  the last  business day  of  the preceding  month (each,  a "Record
Date"), except that the  final distribution in respect  of any Certificate  will
only  be made upon presentation and surrender  of such Certificate at the office
or agency appointed by  the 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  over
    the  unpaid  principal  balance  of such  substituted  Mortgage  Loan  on or
    following the Due Date in the month in which such Distribution Date occurs;
 
                                      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,  except  as  described below  under  "Servicing  of  the
Mortgage  Loans -- Anticipated  Changes in Servicing,"  be the 24th  day of each
month, or if any such day is not a business day, the preceding business day.
 
    "Partial Liquidation  Proceeds"  are  Liquidation  Proceeds  received  by  a
Servicer  on a Mortgage Loan  prior to such Mortgage  Loan becoming a Liquidated
Loan and "net  Partial Liquidation  Proceeds" are  Partial Liquidation  Proceeds
less expenses incurred with respect to such liquidation.
 
    Each  Servicer  is required  to deposit  in the  Certificate Account  on the
Remittance Date certain amounts  in respect of the  Mortgage Loans as set  forth
herein under "Servicing of the Mortgage Loans -- Custodial Accounts." The Master
Servicer  is  required to  remit to  the  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-17 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-17 Certificates) and to Financial Security, pro rata based on their respective
unpaid  Class A Subclass Interest Shortfall Amounts and unpaid Premium Shortfall
Amounts,   as   the   case   may   be,   in   an   aggregate   amount   up    to
 
                                      S-35
<PAGE>
the sum of the previously unpaid Class A Subclass Interest Shortfall Amounts and
unpaid  Premium Shortfall 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-17  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-17 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-17 Certificates.
 
    On each  Distribution Date  an amount  equal to  any Non-Supported  Interest
Shortfall  allocable  to the  Class  A-16 and  Class  A-19 Certificates  will be
distributed from the Reserve  Fund to the  holders of the  Class A-16 and  Class
A-19  Certificates, as applicable,  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-16 and Class A-19 Certificates will
be covered by  the Policy,  together with any  Non-Supported Interest  Shortfall
allocable  to the Class A-16  and Class A-19 Certificates  once the Reserve Fund
has been reduced  to zero. See  "-- The Financial  Guaranty Insurance  Policies"
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 and  Class A-4 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 and Class A-4 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  or Class A-4 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 $6,450,723.
 
    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 $395,402,438.
 
    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 sum of the outstanding  Class A Subclass Principal Balances of the
Class A-16  and Class  A-19  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,  Class A-8,  Class A-9  and
Class  A-10 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's pro rata  share of the  principal portion of
Excess Special Hazard Losses, Excess  Fraud Losses and Excess Bankruptcy  Losses
previously  allocated to  the holders  of Class  A Certificates  (other than the
Class A-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's pro rata share  of the difference,  if any, between  (a) the Class  A
Non-PO  Principal Balance as  of such Determination Date  without regard to this
provision and (b) the  difference between (i) the  Adjusted Pool Amount for  the
preceding  Distribution Date and (ii) the  Adjusted Pool Amount (PO Portion) for
the preceding Distribution Date. Any pro rata allocation among the Subclasses of
Class A  Certificates  described  in  this paragraph  will  be  made  among  the
Subclasses  of Class A Certificates (other than  the Class A-6, Class A-7, Class
A-8, Class A-9 and Class A-10 Certificates), the Class A-6 Components, the Class
A-7 Accrual Component, the  Class A-8 Components, the  Class A-9 Components  and
the
 
                                      S-38
<PAGE>
Class  A-10 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 Class A Subclass  Principal Balance of the  Class A-6, Class A-8,  Class
A-9 or Class A-10 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, Class A-8, Class A-9 and Class A-10 Certificates), the Class A-6
Components, the Class A-7 Accrual Component, the Class A-8 Components, the Class
A-9   Components  and  the   Class  A-10  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
 
                                      S-39
<PAGE>
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)  the 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.
 
    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
 
                                      S-40
<PAGE>
Servicing Agreements. With  respect to  the Mortgage Loans  serviced by  Norwest
Mortgage,  "Month End Interest" for each Distribution  Date will be equal to the
lesser of (i) the aggregate Prepayment  Interest Shortfalls with respect to  the
Mortgage  Loans serviced by Norwest  Mortgage and (ii) the  product of 1/12th of
0.20% and  the  aggregate scheduled  principal  balance (as  determined  in  the
applicable  Underlying Servicing  Agreement) of  the Mortgage  Loans serviced by
Norwest Mortgage. With  respect to  the Mortgage  Loans serviced  by each  Other
Servicer,  "Month End Interest" for each Distribution  Date will be equal to the
lesser of  (i) the  sum  of the  aggregate  Prepayment Interest  Shortfalls  and
aggregate  Curtailment Interest  Shortfalls with  respect to  the Mortgage Loans
serviced by such Other Servicer and (ii) the sum of (X) the product of 1/12th of
0.25% and  the  aggregate scheduled  principal  balance (as  determined  in  the
applicable  Underlying Servicing  Agreement) of  the Mortgage  Loans serviced by
such Other  Servicer  and (Y)  reinvestment  earnings on  payments  received  in
respect  of the  Mortgage Loans or  on other  amounts on deposit  in the related
Servicer  Custodial  Account  pursuant  to  the  related  Underlying   Servicing
Agreement  on such  Distribution Date (other  than with respect  to the Mortgage
Loans serviced  by  Countrywide Home  Loans,  Inc.). As  described  below  under
"Servicing  of the Mortgage  Loans -- Anticipated Changes  in Servicing," any or
all of the Servicers may  be required to begin to  remit to the Master  Servicer
Unscheduled  Principal Receipts in full for deposit into the Certificate Account
daily on a specified business day following receipt thereof which will generally
result in  a deposit  earlier than  on  the following  Remittance Date  and,  in
conjunction  therewith, may  be relieved  of its  obligation to  remit Month End
Interest. Any  such change  may have  an impact  on the  amount of  Compensating
Interest  by increasing the amount described in  clause (b) of the definition of
Available Master Servicing Compensation and  decreasing the amount described  in
clause (c) of the definition thereof. No assurance can be given as to the timing
of any such changes or that any such changes will occur.
 
    As  to any Distribution  Date, Prepayment Interest  Shortfalls to the extent
that they exceed Compensating Interest are referred to herein as  "Non-Supported
Interest  Shortfalls" and will be allocated to  (i) the Class A Certificates 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
that are not Prepayments in Full and any interest shortfalls resulting from  the
timing   of  the  receipt   of  partial  principal   prepayments  by  mortgagors
("Curtailment Interest Shortfalls")  or of other  partial Unscheduled  Principal
Receipts  with respect to the Mortgage Loans  will not be offset by Compensating
Interest, but instead will be borne first by the 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,
 
                                      S-41
<PAGE>
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  Class A-16  or
Class  A-19  Certificates  will be  offset  to  the extent  funds  are available
therefor, from amounts on deposit in the Reserve Fund. Once the Reserve Fund has
been reduced to zero, such shortfalls will be covered by the Policy.
 
    A single reserve fund will be established at the time of the issuance of the
Class A-16  and Class  A-19  Certificates (the  "Reserve  Fund") by  an  initial
deposit  into  a  separate  account maintained  by  the  Trust  Administrator of
approximately $2,000. 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-16 or  Class A-19 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  Subclasses  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-16 and Class A-19 Certificates.
 
    The balance of any amount remaining in the Reserve Fund on the  Distribution
Date  on which  the Class A  Subclass Principal  Balances of the  Class A-16 and
Class A-19  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-16 and  Class A-19 Certificates. See "-- The  Financial
Guaranty Insurance Policies" 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-16 and Class A-19 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's 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.
 
                                      S-42
<PAGE>
    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 Subclasses of
Class A Certificates  and Financial Security  pro rata in  accordance with  each
such   Subclass's  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-17
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 (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-16 and  Class A-19
Certificates. See  "--  The Financial  Guaranty  Insurance Policies"  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
 
                                      S-43
<PAGE>
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  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
$160,370,821.
 
    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  prior  to the
Cross-Over 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. On  and after  the
Cross-Over  Date the  Class A-7  Accrual Component  Distribution Amount  will be
zero. 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,
 
                                      S-44
<PAGE>
    (ii) the Class A Prepayment Percentage of all Unscheduled Principal Receipts
       that  were  received by  a Servicer  with respect  to such  Mortgage Loan
       during  the  Unscheduled  Principal  Receipt  Period  relating  to   such
       Distribution  Date  for  each applicable  type  of  Unscheduled Principal
       Receipt,
 
    (iii) the Class A Prepayment  Percentage of the Scheduled Principal  Balance
       of such Mortgage Loan which, during the month preceding the month of such
       Distribution  Date was repurchased by the  Seller, as described under the
       heading "Description of  the Mortgage  Loans --  Mandatory Repurchase  or
       Substitution of Mortgage Loans" herein, and
 
    (iv) the Class A Percentage of the excess of the unpaid principal balance of
       any  defective Mortgage  Loan for which  a Mortgage  Loan was substituted
       during the  month preceding  the month  in which  such Distribution  Date
       occurs  over the  unpaid principal  balance of  such 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, to  the  payment  of
principal due on such Due Date irrespective of any delinquency in payment by the
mortgagor  and to any Unscheduled Principal  Receipts received or applied during
the applicable Unscheduled Principal Receipt Period for the Distribution Date in
the month preceding such Distribution Date.
 
    A "Realized Loss" is any Liquidated Loan Loss (including any Special  Hazard
Loss  and  any Fraud  Loss) or  any Bankruptcy  Loss. A  "Liquidated Loan"  is a
defaulted Mortgage  Loan  as to  which  the  Servicer has  determined  that  all
recoverable liquidation and insurance proceeds have been received. A "Liquidated
Loan  Loss" on  a Liquidated Loan  is equal  to the excess,  if any,  of (i) the
unpaid principal balance of such Liquidated Loan, plus accrued interest  thereon
in  accordance with the amortization schedule  at the Net Mortgage Interest Rate
through the last day of  the month in which  such Mortgage Loan was  liquidated,
over  (ii) net Liquidation  Proceeds. For purposes of  calculating the amount of
any Liquidated Loan Loss, all  net Liquidation Proceeds (after reimbursement  of
any  previously unreimbursed Periodic Advance) will  be applied first to accrued
interest and then  to the  unpaid principal balance  of the  Liquidated Loan.  A
"Special  Hazard Loss"  is (A)  a Liquidated Loan  Loss suffered  by a Mortgaged
Property on account of direct physical loss exclusive of (i) any loss covered by
a standard hazard insurance policy or,  if the Mortgaged Property is located  in
an  area identified in the Federal  Register by the Federal Emergency Management
Agency as having special flood hazards,  a flood insurance policy, of the  types
described  in  the Prospectus  under  "The Trust  Estates  -- Mortgage  Loans --
Insurance Policies" and  (ii) any loss  caused by or  resulting from (a)  normal
wear  and tear, (b) dishonest acts of  the Trustee, the 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
 
                                      S-45
<PAGE>
part thereof ensues or (B)  a Liquidated Loan Loss  arising from or relating  to
the  presence  or suspected  presence  of hazardous  wastes  or substances  on a
Mortgaged Property.  A "Fraud  Loss" is  a Liquidated  Loan Loss  incurred on  a
Liquidated  Loan as to which there was fraud in the origination of such Mortgage
Loan. A "Bankruptcy Loss" is a loss attributable to certain actions which may be
taken by a  bankruptcy court  in connection with  a Mortgage  Loan, including  a
reduction by a bankruptcy court of the principal balance of or the interest rate
on  a Mortgage Loan or an extension  of its maturity. A "Debt Service Reduction"
means a reduction in  the amount of monthly  payments due to certain  bankruptcy
proceedings,  but does  not include  any permanent  forgiveness of  principal. A
"Deficient Valuation" with  respect to a  Mortgage Loan means  a valuation by  a
court  of  the  Mortgaged  Property  in  an  amount  less  than  the outstanding
indebtedness under the Mortgage Loan or  any reduction in the amount of  monthly
payments  that results in a permanent  forgiveness of principal, which valuation
or reduction results from a bankruptcy proceeding.
 
    The "Class A Percentage" for any Distribution Date occurring on or prior  to
the  Cross-Over Date is the percentage (subject  to rounding), which in no event
will exceed 100%, obtained by dividing  the Class A Non-PO Principal Balance  as
of such date (before taking into account distributions in reduction of principal
balance  on such date) by  the Pool Balance (Non-PO  Portion). The "Pool Balance
(Non-PO Portion)" is the sum for  each outstanding Mortgage Loan of the  product
of  (i)  the Non-PO  Fraction  for such  Mortgage  Loan and  (ii)  the Scheduled
Principal Balance of such Mortgage Loan as of such Distribution Date. The  Class
A  Percentage for the first Distribution  Date will be approximately 93.92%. The
Class A  Percentage will  decrease as  a  result of  the allocation  of  certain
unscheduled payments in respect of principal according to the Class A Prepayment
Percentage  for a specified period  to the Class A  Certificates (other than the
Class A-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
 
                                      S-46
<PAGE>
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 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
 
                                      S-47
<PAGE>
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  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 (a) concurrently, to  the Class A-8  A Component, the  Class
       A-9   A  Component  and  the  Class  A-10  A  Component,  pro  rata,  (b)
       concurrently, to the Class A-8 B Component, the Class A-9 B Component and
       the Class  A-10  B Component,  pro  rata, and  (c)  to 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;
 
                                      S-48
<PAGE>
    (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; 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 (a) concurrently, to  the Class A-8  A Component, the  Class
       A-9  A Component and the Class A-10 A Component, pro rata, and (b) to 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)
       concurrently, to the Class A-8 B Component, the Class A-9 B Component and
       the  Class A-10  B Component, pro  rata, until  their Component Principal
       Balances have 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;
 
                                      S-49
<PAGE>
        (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, without regard to its Scheduled
           Amount  for  such Distribution  Date,  until its  Component Principal
           Balance has been reduced to zero;
 
        (v) sequentially (a)  concurrently, to  the Class A-8  A Component,  the
           Class  A-9 A Component and the Class  A-10 A Component, pro rata, (b)
           concurrently, to the Class A-8 B Component, the Class A-9 B Component
           and the Class A-10 B Component, pro rata, and (c) to 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;
 
        (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 (a)  concurrently, to  the Class A-8  A Component,  the
           Class  A-9 A Component and the Class  A-10 A Component, pro rata, (b)
           concurrently, to the Class A-8 B Component, the Class A-9 B Component
           and the Class A-10 B Component, pro rata, and (c) to 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;
 
                                      S-50
<PAGE>
    SECOND, to the Class A-11 Certificates, until the Class A Subclass Principal
Balance thereof has been reduced to zero; and
 
    THIRD, concurrently, to the Class A-R and Class A-LR Certificates, pro rata,
until the Class  A Subclass  Principal Balance of  each such  Subclass has  been
reduced to zero.
 
    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-18 Certificates, up to the Class A-18 Priority Amount;
 
    SECOND,  on each  Distribution Date  on and  after the  Distribution Date in
August 1999,  concurrently,  to  the  Class A-16,  Class  A-17  and  Class  A-19
Certificates,  pro  rata,  an  amount  up $30,000  until  the  Class  A Subclass
Principal Balance of each such Subclass has been reduced to zero;
 
    THIRD, sequentially, to  the Class A-12,  Class A-13, Class  A-14 and  Class
A-15  Certificates, until  the Class A  Subclass Principal Balance  of each such
Subclass has been reduced to zero;
 
    FOURTH,  concurrently,  to  the  Class  A-16,  Class  A-17  and  Class  A-19
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-18 Certificates, until the Class A Subclass  Principal
Balance hereof has been reduced to zero.
 
    The  "Group I Percentage"  is equal to  approximately 72.7063933894% and the
"Group II Percentage" is equal to approximately 27.2936066106%.
 
    The "Class A-18 Priority Amount" for any Distribution Date means the  lesser
of (i) the Class A Subclass Principal Balance of the Class A-18 Certificates and
(ii)  the sum of (A) the product of (1) the Class A-18 Percentage, (2) the Class
A-18 Scheduled Percentage  and (3) the  Scheduled Principal Amount  and (B)  the
product  of (1) the Class  A-18 Percentage, (2) the  Class A-18 Prepayment Shift
Percentage, and (3) the Unscheduled Principal Amount.
 
    The "Class A-18 Percentage" means the Class A Subclass Principal Balance  of
the Class A-18 Certificates divided by the Pool Balance (Non-PO Portion).
 
    The  "Class A-18 Scheduled Percentage" for any Distribution Date will be the
percentage indicated below:
 
<TABLE>
<CAPTION>
DISTRIBUTION DATE OCCURING IN:                                                       CLASS A-18 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.
 
                                      S-51
<PAGE>
    The  "Class A-18 Prepayment Shift Percentage" for any Distribution Date will
be the percentage indicated below:
 
<TABLE>
<CAPTION>
                                                                                   CLASS A-18 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-55 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 beginning on page S-92 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 beginning on page S-92 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.
 
    Except as described herein under "-- Distributions in Reduction of the Class
A Subclass Principal Balance of the Class A-16 and Class A-19 Certificates" with
respect to the Class A-16 and  Class A-19 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..........     99.66248549       99.81492264
September 1996.......     99.25822681       99.60054776
October 1996.........     98.78743883       99.35695107
November 1996........     98.25047376       99.08423457
December 1996........     97.64782178       98.78252654
January 1997.........     96.98011117       98.45198155
February 1997........     96.24810810       98.09278034
March 1997...........     95.45271584       97.70512975
April 1997...........     94.59497357       97.28926252
May 1997.............     93.67607689       96.84544642
June 1997............     92.69732987       96.37396521
July 1997............     91.66016594       95.87512789
August 1997..........     90.56615700       95.34927355
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------  ----------------
<S>                    <C>               <C>
                                     %                 %
September 1997.......     89.41698478       94.79676057
October 1997.........     88.21448579       94.21798715
November 1997........     86.96057246       93.61335922
December 1997........     85.65730157       92.98332139
January 1998.........     84.30686423       92.32835514
February 1998........     82.91165065       91.64901017
March 1998...........     81.47407894       90.94583234
April 1998...........     79.99695280       90.21952499
May 1998.............     78.48294310       89.47072420
June 1998............     76.93528190       88.70031072
July 1998............     75.35689844       87.90903086
August 1998..........     73.75163645       87.09804550
September 1998.......     72.12357325       86.26863887
</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>
October 1998.........     70.48010178       85.42363081
November 1998........     68.84075437       84.57146743
December 1998........     67.22783434       83.72215170
January 1999.........     65.65134467       82.88040646
February 1999........     64.11140911       82.04659302
March 1999...........     62.60718650       81.22063790
April 1999...........     61.13785493       80.40246830
May 1999.............     59.70261135       79.59201208
June 1999............     58.30067103       78.78919775
July 1999............     56.93126726       77.99395452
August 1999..........     55.59365087       77.20621223
September 1999.......     54.28708985       76.42590135
October 1999.........     53.01086893       75.65295303
November 1999........     51.76428926       74.88729902
December 1999........     50.54666799       74.12887171
January 2000.........     49.35733789       73.37760413
February 2000........     48.19564705       72.63342991
March 2000...........     47.06095847       71.89628328
April 2000...........     45.95264976       71.16609912
May 2000.............     44.87011280       70.44281286
June 2000............     43.81275340       69.72636056
July 2000............     42.77999098       69.01667885
August 2000..........     41.77125829       68.31370496
September 2000.......     40.78600107       67.61737669
October 2000.........     39.82367777       66.92763242
November 2000........     38.88375926       66.24441108
December 2000........     37.96572856       65.56765219
January 2001.........     37.06908052       64.89729581
February 2001........     36.19332159       64.23328255
March 2001...........     35.33796954       63.57555359
April 2001...........     34.50255321       62.92405062
May 2001.............     33.68661224       62.27871590
June 2001............     32.88969684       61.63949221
July 2001............     32.11136755       61.00632284
August 2001..........     31.35119497       60.37915163
September 2001.......     30.60875958       59.75792293
October 2001.........     29.88365149       59.14258159
November 2001........     29.17547022       58.53307299
December 2001........     28.48382446       57.92934299
January 2002.........     27.80833191       57.33133798
February 2002........     27.14861906       56.73900481
March 2002...........     26.50432096       56.15229084
April 2002...........     25.87508103       55.57114393
May 2002.............     25.26055092       54.99551238
June 2002............     24.66039025       54.42534500
July 2002............     24.07426649       53.86059107
August 2002..........     23.50185472       53.30120032
September 2002.......     22.94283751       52.74712297
October 2002.........     22.39690472       52.19830966
November 2002........     21.86375334       51.65471154
December 2002........     21.34308733       51.11628015
January 2003.........     20.83461745       50.58296753
February 2003........     20.33806112       50.05472613
March 2003...........     19.85314226       49.53150885
April 2003...........     19.37959113       49.01326901
May 2003.............     18.91714420       48.49996040
June 2003............     18.46554400       47.99153720
July 2003............     18.02453900       47.48795401
August 2003..........     17.59388344       46.98916588
September 2003.......     17.17333723       46.49512824
October 2003.........     16.76266580       46.00579696
November 2003........     16.36163997       45.52112831
December 2003........     15.97003587       45.04107894
January 2004.........     15.58763474       44.56560594
February 2004........     15.21422289       44.09466676
March 2004...........     14.84959155       43.62821927
April 2004...........     14.49353675       43.16622170
May 2004.............     14.14585922       42.70863270
<CAPTION>
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------  ----------------
<S>                    <C>               <C>
                                     %                 %
June 2004............     13.80636429       42.25541127
July 2004............     13.47486176       41.80651681
August 2004..........     13.15116584       41.36190908
September 2004.......     12.83509499       40.92154823
October 2004.........     12.52647188       40.48539475
November 2004........     12.22512327       40.05340952
December 2004........     11.93087990       39.62555378
January 2005.........     11.64357642       39.20178910
February 2005........     11.36305130       38.78207744
March 2005...........     11.08914672       38.36638110
April 2005...........     10.82170853       37.95466270
May 2005.............     10.56058612       37.54688525
June 2005............     10.30563235       37.14301207
July 2005............     10.05670348       36.74300684
August 2005..........      9.81365910       36.34683355
September 2005.......      9.57636204       35.95445654
October 2005.........      9.34467829       35.56584048
November 2005........      9.11847693       35.18095036
December 2005........      8.89763008       34.79975150
January 2006.........      8.68201280       34.42220953
February 2006........      8.47150306       34.04829040
March 2006...........      8.26598163       33.67796038
April 2006...........      8.06533203       33.31118606
May 2006.............      7.86944049       32.94793430
June 2006............      7.67819588       32.58817232
July 2006............      7.49148960       32.23186760
August 2006..........      7.30921561       31.87898795
September 2006.......      7.13127029       31.52950145
October 2006.........      6.95755242       31.18337650
November 2006........      6.78796315       30.84058176
December 2006........      6.62240588       30.50108623
January 2007.........      6.46078628       30.16485914
February 2007........      6.30301217       29.83187003
March 2007...........      6.14899354       29.50208874
April 2007...........      5.99864244       29.17548536
May 2007.............      5.85187297       28.85203027
June 2007............      5.70860121       28.53169411
July 2007............      5.56874519       28.21444781
August 2007..........      5.43222485       27.90026255
September 2007.......      5.29896197       27.58910980
October 2007.........      5.16888015       27.28096126
November 2007........      5.04190476       26.97578894
December 2007........      4.91796290       26.67356505
January 2008.........      4.79698337       26.37426210
February 2008........      4.67889661       26.07785283
March 2008...........      4.56363468       25.78431026
April 2008...........      4.45113123       25.49360762
May 2008.............      4.34132142       25.20571843
June 2008............      4.23414193       24.92061641
July 2008............      4.12953094       24.63827557
August 2008..........      4.02742801       24.35867012
September 2008.......      3.92777414       24.08177452
October 2008.........      3.83051171       23.80756349
November 2008........      3.73558441       23.53601195
December 2008........      3.64293726       23.26709506
January 2009.........      3.55251654       23.00078823
February 2009........      3.46426980       22.73706708
March 2009...........      3.37814580       22.47590745
April 2009...........      3.29409449       22.21728542
May 2009.............      3.21206699       21.96117727
June 2009............      3.13201555       21.70755953
July 2009............      3.05389355       21.45640891
August 2009..........      2.97765542       21.20770237
September 2009.......      2.90325669       20.96141705
October 2009.........      2.83065390       20.71753033
November 2009........      2.75980463       20.47601978
December 2009........      2.69066741       20.23686320
January 2010.........      2.62320176       20.00003855
</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 2010........      2.55736816       19.76552406
March 2010...........      2.49312797       19.53329809
April 2010...........      2.43044349       19.30333926
May 2010.............      2.36927787       19.07562635
June 2010............      2.30959515       18.85013835
July 2010............      2.25136018       18.62685445
August 2010..........      2.19453864       18.40575402
September 2010.......      2.13909704       18.18681663
October 2010.........      2.08500262       17.97002202
November 2010........      2.03222343       17.75535016
December 2010........      1.98072824       17.54278115
January 2011.........      1.93048656       17.33229531
February 2011........      1.88146862       17.12387315
March 2011...........      1.83364533       16.91749532
April 2011...........      1.78698829       16.71314269
May 2011.............      1.74146978       16.51079628
June 2011............      1.69706269       16.31043731
July 2011............      1.65374057       16.11204714
August 2011..........      1.61147761       15.91560733
September 2011.......      1.57024855       15.72109960
October 2011.........      1.53002877       15.52850585
November 2011........      1.49079421       15.33780812
December 2011........      1.45252136       15.14898866
January 2012.........      1.41518729       14.96202984
February 2012........      1.37876959       14.77691422
March 2012...........      1.34324637       14.59362452
April 2012...........      1.30859627       14.41214359
May 2012.............      1.27479842       14.23245449
June 2012............      1.24183244       14.05454039
July 2012............      1.20967844       13.87838465
August 2012..........      1.17831699       13.70397075
September 2012.......      1.14772910       13.53128235
October 2012.........      1.11789626       13.36030326
November 2012........      1.08880037       13.19101743
December 2012........      1.06042377       13.02340895
January 2013.........      1.03274919       12.85746208
February 2013........      1.00575980       12.69316121
March 2013...........      0.97943916       12.53049089
April 2013...........      0.95377118       12.36943578
May 2013.............      0.92874020       12.20998071
June 2013............      0.90433090       12.05211066
July 2013............      0.88052833       11.89581071
August 2013..........      0.85731788       11.74106612
September 2013.......      0.83468531       11.58786226
October 2013.........      0.81261669       11.43618464
November 2013........      0.79109842       11.28601892
December 2013........      0.77011724       11.13735086
January 2014.........      0.74966020       10.99016639
February 2014........      0.72971464       10.84445155
March 2014...........      0.71026821       10.70019251
April 2014...........      0.69130884       10.55737556
May 2014.............      0.67282477       10.41598713
June 2014............      0.65480450       10.27601378
July 2014............      0.63723681       10.13744219
August 2014..........      0.62011072       10.00025915
September 2014.......      0.60341556        9.86445158
October 2014.........      0.58714086        9.73000654
November 2014........      0.57127643        9.59691118
December 2014........      0.55581232        9.46515278
January 2015.........      0.54073880        9.33471876
February 2015........      0.52604639        9.20559661
March 2015...........      0.51172581        9.07777399
April 2015...........      0.49776803        8.95123863
May 2015.............      0.48416422        8.82597840
June 2015............      0.47090574        8.70198126
July 2015............      0.45798551        8.57926270
August 2015..........      0.44539394        8.45778321
September 2015.......      0.43312301        8.33753109
<CAPTION>
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------  ----------------
<S>                    <C>               <C>
                                     %                 %
October 2015.........      0.42116490        8.21849476
November 2015........      0.40951197        8.10066275
December 2015........      0.39815674        7.98402368
January 2016.........      0.38709195        7.86856629
February 2016........      0.37631048        7.75427941
March 2016...........      0.36580540        7.64115200
April 2016...........      0.35556993        7.52917310
May 2016.............      0.34560592        7.41851445
June 2016............      0.33591063        7.30925038
July 2016............      0.32647528        7.20132373
August 2016..........      0.31728282        7.09449475
September 2016.......      0.30832731        6.98875305
October 2016.........      0.29960291        6.88408836
November 2016........      0.29110394        6.78049048
December 2016........      0.28282484        6.67794933
January 2017.........      0.27476021        6.57645491
February 2017........      0.26690474        6.47599733
March 2017...........      0.25925329        6.37656675
April 2017...........      0.25180082        6.27815347
May 2017.............      0.24454240        6.18074786
June 2017............      0.23747325        6.08434036
July 2017............      0.23058867        5.98892154
August 2017..........      0.22388409        5.89448202
September 2017.......      0.21735506        5.80101252
October 2017.........      0.21099722        5.70850386
November 2017........      0.20480632        5.61694692
December 2017........      0.19877822        5.52633269
January 2018.........      0.19290886        5.43665222
February 2018........      0.18719429        5.34789666
March 2018...........      0.18163067        5.26005723
April 2018...........      0.17621422        5.17312525
May 2018.............      0.17094128        5.08709210
June 2018............      0.16580827        5.00194924
July 2018............      0.16081168        4.91768824
August 2018..........      0.15594811        4.83430071
September 2018.......      0.15121422        4.75177836
October 2018.........      0.14660677        4.67011296
November 2018........      0.14212259        4.58929638
December 2018........      0.13775857        4.50932055
January 2019.........      0.13351231        4.43020107
February 2019........      0.12938023        4.35190616
March 2019...........      0.12536045        4.27446842
April 2019...........      0.12145147        4.19793504
May 2019.............      0.11765020        4.12228810
June 2019............      0.11395184        4.04743220
July 2019............      0.11035376        3.97335981
August 2019..........      0.10685345        3.90006347
September 2019.......      0.10344885        3.82755409
October 2019.........      0.10013760        3.75582838
November 2019........      0.09691684        3.68485627
December 2019........      0.09378498        3.61466383
January 2020.........      0.09073905        3.54521030
February 2020........      0.08777684        3.47648863
March 2020...........      0.08489624        3.40849185
April 2020...........      0.08209515        3.34121304
May 2020.............      0.07937156        3.27464535
June 2020............      0.07672348        3.20878200
July 2020............      0.07414898        3.14361627
August 2020..........      0.07164617        3.07914149
September 2020.......      0.06921323        3.01535106
October 2020.........      0.06684834        2.95223846
November 2020........      0.06454978        2.88979720
December 2020........      0.06231583        2.82802086
January 2021.........      0.06014482        2.76690309
February 2021........      0.05803514        2.70643760
March 2021...........      0.05598520        2.64661815
April 2021...........      0.05399345        2.58743854
May 2021.............      0.05205840        2.52889267
</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>
June 2021............      0.05017895        2.47099324
July 2021............      0.04835327        2.41371523
August 2021..........      0.04657997        2.35705269
September 2021.......      0.04485769        2.30099973
October 2021.........      0.04318508        2.24555050
November 2021........      0.04156087        2.19069922
December 2021........      0.03998378        2.13644016
January 2022.........      0.03845259        2.08276763
February 2022........      0.03696608        2.02967601
March 2022...........      0.03552309        1.97715973
April 2022...........      0.03412248        1.92521326
May 2022.............      0.03276313        1.87383113
June 2022............      0.03144395        1.82300793
July 2022............      0.03016388        1.77273828
August 2022..........      0.02892189        1.72301686
September 2022.......      0.02771698        1.67383841
October 2022.........      0.02654815        1.62519770
November 2022........      0.02541446        1.57708956
December 2022........      0.02431520        1.52952670
January 2023.........      0.02324921        1.48248602
February 2023........      0.02221562        1.43596248
March 2023...........      0.02121355        1.38995111
April 2023...........      0.02024216        1.34444697
May 2023.............      0.01930063        1.29944517
June 2023............      0.01838815        1.25494087
July 2023............      0.01750395        1.21092928
August 2023..........      0.01664726        1.16740565
September 2023.......      0.01581733        1.12436526
October 2023.........      0.01501359        1.08181519
November 2023........      0.01423519        1.03973894
December 2023........      0.01348272        0.99824632
January 2024.........      0.01275418        0.95721705
<CAPTION>
    DISTRIBUTION           400% SPA          175% SPA
        DATE           TARGETED BALANCE  TARGETED BALANCE
- ---------------------  ----------------  ----------------
<S>                    <C>               <C>
                                     %                 %
February 2024........      0.01204891        0.91664665
March 2024...........      0.01136628        0.87653068
April 2024...........      0.01070566        0.83686475
May 2024.............      0.01006647        0.79764451
June 2024............      0.00944810        0.75886564
July 2024............      0.00884998        0.72052387
August 2024..........      0.00827156        0.68261497
September 2024.......      0.00771228        0.64513474
October 2024.........      0.00717163        0.60807904
November 2024........      0.00664919        0.57145451
December 2024........      0.00614434        0.53524620
January 2025.........      0.00565660        0.49945005
February 2025........      0.00518554        0.46406804
March 2025...........      0.00473064        0.42909017
April 2025...........      0.00429185        0.39455276
May 2025.............      0.00386832        0.36041122
June 2025............      0.00345990        0.32669262
July 2025............      0.00306612        0.29338845
August 2025..........      0.00268736        0.26057871
September 2025.......      0.00232269        0.22820806
October 2025.........      0.00197318        0.19643336
November 2025........      0.00163745        0.16514680
December 2025........      0.00131737        0.13459354
January 2026.........      0.00101092        0.10459868
February 2026........      0.00072193        0.07562243
March 2026...........      0.00045075        0.04775602
April 2026...........      0.00021149        0.02261205
May 2026.............      0.00005739        0.00617526
June 2026............      0.00000450        0.00048588
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
                       ----------------%
                          98.29640160
DISTRIBUTION DATE         96.37308540
- ---------------------     94.23054833
                          91.86940086
August 1996..........     89.29036708
September 1996.......     86.49428436
October 1996.........     83.48210302
November 1996........     80.25488606
December 1996........     76.81380854
January 1997.........   PERCENTAGE OF
February 1997........  INITIAL CLASS A
March 1997...........      SUBCLASS
April 1997...........     PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
May 1997.............     73.16022595
June 1997............     69.29553462
July 1997............     65.22124082
August 1997..........     60.93899880
September 1997.......     56.45053158
October 1997.........     51.75778397
November 1997........     46.86269004
December 1997........     41.76740471
January 1998.........     36.47429390
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
DISTRIBUTION DATE          BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
February 1998........     30.98617640
March 1998...........     25.30578449
April 1998...........     19.43695969
May 1998.............     13.38302043
June 1998............      7.14909568
July 1998............      0.73927815
August 1998
 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-2 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
    DISTRIBUTION       ----------------%
        DATE
- ---------------------    100.00000000
                          92.07047888
Up to and including       82.91894909
July 1998............     73.57596286
August 1998..........   PERCENTAGE OF
September 1998.......  INITIAL CLASS A
October 1998.........      SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
November 1998........     64.12540631
December 1998........     54.66913969
January 1999.........     45.25609811
February 1999........     35.89052551
March 1999...........     26.57218171
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
April 1999...........     17.30082769
May 1999.............      8.07622578
June 1999
 and thereafter......      0.00000000
</TABLE>
 
                             CLASS A-3 CERTIFICATES
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
                          PRINCIPAL
                           BALANCE
    DISTRIBUTION       ----------------%
        DATE
- ---------------------    100.00000000
                          99.07023430
Up to and including       91.36468488
May 1999.............     83.69799031
June 1999............     76.06995423
July 1999............   PERCENTAGE OF
August 1999..........  INITIAL CLASS A
September 1999.......      SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
October 1999.........     68.48038137
November 1999........     60.92907749
December 1999........     53.41584945
January 2000.........     45.94050498
February 2000........     38.50285306
March 2000...........     31.10270351
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
April 2000...........     23.73986722
May 2000.............     16.41415615
June 2000............      9.12538316
July 2000............      1.87336223
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
                          92.59491878
Up to and including       82.64346025
July 2000............     72.74218097
August 2000..........   PERCENTAGE OF
September 2000.......  INITIAL CLASS A
October 2000.........      SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
November 2000........     62.89082851
December 2000........     53.08915172
January 2001.........     43.33690092
February 2001........     33.63382770
March 2001...........     23.97968499
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
April 2001...........     14.37422708
May 2001.............      4.81720945
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
                          97.96476790
Up to and including       93.86062193
May 2001.............     89.85702852
June 2001............     85.87373217
July 2001............     81.91062856
August 2001..........     77.96761385
September 2001.......     74.04458477
October 2001.........     70.14143864
November 2001........   PERCENTAGE OF
December 2001........  INITIAL CLASS A
January 2002.........      SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
February 2002........     66.25807328
March 2002...........     62.39438698
April 2002...........     58.55027870
May 2002.............     54.72564782
June 2002............     50.92039427
July 2002............     47.13441855
August 2002..........     43.39339446
September 2002.......     39.67129597
October 2002.........     35.96802513
November 2002........     32.28348443
 
<CAPTION>
                        PERCENTAGE OF
                       INITIAL CLASS A
                           SUBCLASS
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
December 2002........     28.61757686
January 2003.........     24.97020598
February 2003........     21.34127578
March 2003...........     17.73069080
April 2003...........     14.13835606
May 2003.............     10.56417709
June 2003............      7.00805988
July 2003............      3.46991098
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              98.29640141
- ---------------------     96.37308551
                          94.23054836
August 1996..........     91.86940100
September 1996.......     89.29036696
October 1996.........     86.49428435
November 1996........     83.48210295
December 1996........     80.25488584
January 1997.........     76.81380863
February 1997........   PERCENTAGE OF
March 1997...........      INITIAL
April 1997...........     COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
May 1997.............     73.16022582
June 1997............     69.29553466
July 1997............     65.22124076
August 1997..........     60.93899875
September 1997.......     56.45053176
October 1997.........     51.75778414
November 1997........     46.86268991
December 1997........     41.76740473
January 1998.........     36.47429390
 
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
February 1998........     30.98617642
March 1998...........     25.30578456
April 1998...........     19.43695973
May 1998.............     13.38302034
June 1998............      7.14909589
July 1998............      0.73927812
August 1998
 and thereafter......      0.00000000
</TABLE>
 
                        CLASS A-6 B SCHEDULED COMPONENT
                                   SCHEDULE I
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
                          PRINCIPAL
                           BALANCE
                       ----------------%
    DISTRIBUTION
        DATE              99.71499001
- ---------------------     99.35899005
                          98.93220484
August 1996..........     98.43492163
September 1996.......     97.86751025
October 1996.........     97.23042295
November 1996........     96.52419425
December 1996........     95.74944044
January 1997.........     94.90685919
February 1997........     93.99725233
March 1997...........     93.02147758
April 1997...........     91.98047195
May 1997.............     90.87526363
June 1997............     89.70694458
July 1997............     88.47672087
August 1997..........     87.18583389
September 1997.......     85.83563655
October 1997.........     84.42758803
November 1997........     82.96333102
December 1997........     81.44451152
January 1998.........     79.87316836
February 1998........     78.25119409
March 1998...........     76.58109427
April 1998...........     74.86505257
May 1998.............     73.10627378
June 1998............     71.30825296
July 1998............     69.47818827
August 1998..........     67.63677851
September 1998.......     65.80864301
October 1998.........   PERCENTAGE OF
November 1998........      INITIAL
December 1998........     COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
January 1999.........     64.00543112
February 1999........     62.22799758
March 1999...........     60.47611754
April 1999...........     58.74956801
May 1999.............     57.04812757
June 1999............     55.37157673
July 1999............     53.71969764
August 1999..........     52.09227421
September 1999.......     50.48909205
October 1999.........     48.90993855
November 1999........     47.35460262
December 1999........     45.82287500
January 2000.........     44.31454799
February 2000........     42.82941566
March 2000...........     41.36727362
April 2000...........     39.92791909
May 2000.............     38.51115100
June 2000............     37.11676983
July 2000............     35.74457764
August 2000..........     34.39437804
September 2000.......     33.06597633
October 2000.........     31.75917923
November 2000........     30.47379504
December 2000........     29.20963370
January 2001.........     27.96650648
February 2001........     26.74422632
March 2001...........     25.54260757
April 2001...........     24.36146612
May 2001.............     23.20061935
 
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
June 2001............     22.05988599
July 2001............     20.93908638
August 2001..........     19.87774133
September 2001.......     18.83574969
October 2001.........     17.81293602
November 2001........     16.80912618
December 2001........     15.82414751
January 2002.........     14.85782870
February 2002........     13.90999988
March 2002...........     12.98049249
April 2002...........     12.06913931
May 2002.............     11.17577451
June 2002............     10.30023354
July 2002............      9.44235326
August 2002..........      8.61448634
September 2002.......      7.80382482
October 2002.........      7.01020999
November 2002........      6.23348440
December 2002........      5.47349193
January 2003.........      4.73007766
February 2003........      4.00308793
March 2003...........      3.29237039
April 2003...........      2.59777384
May 2003.............      1.91914838
June 2003............      1.25634525
July 2003............      0.60921705
August 2003
 and thereafter......      0.00000000
</TABLE>
 
                                      S-57
<PAGE>
                     SCHEDULED COMPONENT PRINCIPAL BALANCES
        AS PERCENTAGE OF INITIAL COMPONENT PRINCIPAL BALANCE (CONTINUED)
 
                        CLASS A-6 B SCHEDULED COMPONENT
                                  SCHEDULE II
<TABLE>
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
                          PRINCIPAL
                           BALANCE
    DISTRIBUTION       ----------------%
        DATE
- ---------------------     100.0000000
                          99.99841074
Up to and including       93.37333312
July 2003............     86.78145613
August 2003..........     80.22260555
September 2003.......     73.69660789
October 2003.........   PERCENTAGE OF
November 2003........      INITIAL
December 2003........     COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
January 2004.........     67.20329062
February 2004........     60.74248222
March 2004...........     54.31401185
April 2004...........     47.91770973
May 2004.............     41.55340694
June 2004............     35.22093530
July 2004............     28.92012765
 
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
August 2004..........     22.74087909
September 2004.......     16.59205280
October 2004.........     10.47348797
November 2004........      4.38502446
December 2004
 and thereafter......      0.00000000
</TABLE>
 
                                      S-58
<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              99.90492017
- ---------------------     99.78622036
                          99.64397364
August 1996..........     99.47828960
September 1996.......     99.28931431
October 1996.........     99.07723035
November 1996........     98.84225670
December 1996........     98.58464853
January 1997.........     98.30469701
February 1997........     98.00273683
March 1997...........     97.67912977
April 1997...........     97.33427239
May 1997.............     96.96859995
June 1997............     96.58257684
July 1997............     96.17671316
August 1997..........     95.75153814
September 1997.......     95.30762514
October 1997.........     94.84558948
November 1997........     94.36611328
December 1997........     93.86988522
January 1998.........     93.35772850
February 1998........     92.83042164
March 1998...........     92.28894833
April 1998...........     91.73418764
May 1998.............     91.16735535
June 1998............     90.58975983
July 1998............     90.00391739
August 1998..........     89.41674153
September 1998.......     88.83635530
October 1998.........     88.26655234
November 1998........     87.70755548
December 1998........     87.15923162
January 1999.........     86.62144904
February 1999........     86.09407752
March 1999...........     85.57698818
April 1999...........     85.07005357
May 1999.............     84.57314762
June 1999............     84.08614562
July 1999............     83.60892420
August 1999..........     83.14136136
September 1999.......     82.68333641
October 1999.........     82.23472996
November 1999........     81.79542393
December 1999........     81.36530152
January 2000.........     80.94424721
February 2000........     80.53214674
March 2000...........     80.12888709
April 2000...........     79.73435647
May 2000.............     79.34844431
June 2000............     78.97104127
July 2000............     78.60203918
August 2000..........     78.24133107
September 2000.......     77.88881113
October 2000.........     77.54437473
November 2000........     77.20791836
December 2000........     76.87933966
January 2001.........   PERCENTAGE OF
February 2001........      INITIAL
March 2001...........     COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
April 2001...........     76.55853741
May 2001.............     76.24541148
June 2001............     75.93986286
July 2001............     75.64179360
August 2001..........     75.36458919
September 2001.......     75.09457868
October 2001.........     74.83166747
November 2001........     74.57576202
December 2001........     74.32676983
January 2002.........     74.08459941
February 2002........     73.84916031
March 2002...........     73.62036304
April 2002...........     73.39811913
May 2002.............     73.18234110
June 2002............     72.97294242
July 2002............     72.76983753
August 2002..........     72.57712936
September 2002.......     72.39049010
October 2002.........     72.20983738
November 2002........     72.03508974
December 2002........     71.86616665
January 2003.........     71.70298846
February 2003........     71.54547645
March 2003...........     71.39355273
April 2003...........     71.24714033
May 2003.............     71.10616312
June 2003............     70.97054585
July 2003............     70.84021410
August 2003..........     70.72261782
September 2003.......     69.41164208
October 2003.........     68.11357805
November 2003........     66.82830374
December 2003........     65.55569836
January 2004.........     64.29564218
February 2004........     63.04801663
March 2004...........     61.81270422
April 2004...........     60.58958857
May 2004.............     59.37855439
June 2004............     58.17948744
July 2004............     56.99227457
August 2004..........     55.84191160
September 2004.......     54.70278345
October 2004.........     53.57478392
November 2004........     52.45780781
December 2004........     51.35175090
January 2005.........     50.25650994
February 2005........     49.17198266
March 2005...........     48.09806772
April 2005...........     47.03466475
May 2005.............     45.98167431
June 2005............     44.93899789
July 2005............     43.90653790
August 2005..........     42.90675875
September 2005.......     41.91655804
October 2005.........     40.93584661
 
<CAPTION>
                        PERCENTAGE OF
                           INITIAL
                          COMPONENT
    DISTRIBUTION          PRINCIPAL
        DATE               BALANCE
- ---------------------  ----------------
<S>                    <C>
                                     %
November 2005........     39.96453616
December 2005........     39.00253916
January 2006.........     38.04976894
February 2006........     37.10613957
March 2006...........     36.17156598
April 2006...........     35.24596384
May 2006.............     34.32924961
June 2006............     33.42134051
July 2006............     32.52215455
August 2006..........     31.63161048
September 2006.......     30.74962781
October 2006.........     29.87612678
November 2006........     29.01102838
December 2006........     28.15425431
January 2007.........     27.30572702
February 2007........     26.46536966
March 2007...........     25.63310609
April 2007...........     24.80886087
May 2007.............     23.99255928
June 2007............     23.18412726
July 2007............     22.38349144
August 2007..........     21.59057915
September 2007.......     20.80531837
October 2007.........     20.02763774
November 2007........     19.25746659
December 2007........     18.49473487
January 2008.........     17.73937319
February 2008........     16.99131281
March 2008...........     16.25048560
April 2008...........     15.51682409
May 2008.............     14.79026142
June 2008............     14.07073134
July 2008............     13.35816822
August 2008..........     12.65250703
September 2008.......     11.95368336
October 2008.........     11.26163337
November 2008........     10.57629383
December 2008........      9.89760207
January 2009.........      9.22549603
February 2009........      8.55991420
March 2009...........      7.90079565
April 2009...........      7.24808001
May 2009.............      6.60170746
June 2009............      5.96161876
July 2009............      5.32775518
August 2009..........      4.70005855
September 2009.......      4.07847125
October 2009.........      3.46293617
November 2009........      2.85339675
December 2009........      2.24979694
January 2010.........      1.65208120
February 2010........      1.06019452
March 2010...........      0.47408239
April 2010
 and thereafter......      0.00000000
</TABLE>
 
                                      S-59
<PAGE>
DISTRIBUTIONS IN REDUCTION OF THE CLASS A SUBCLASS PRINCIPAL BALANCE OF THE
CLASS A-16 AND CLASS A-19 CERTIFICATES
 
    GENERAL.  As to  distributions of principal among  holders of Class A-16  or
Class A-19 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-16  or Class A-19 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
Certificates  of such Subclass. 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-16  Certificate" or  "Individual Class  A-19 Certificate,"  as applicable) 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 Certificates of  such
Subclass  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 Certificates of such Subclass by random lot, as described below  under
"--   Mandatory  Distributions  of  Principal  on  Class  A-16  and  Class  A-19
Certificates."
 
    On each Distribution Date on  which amounts are available for  distributions
in  reduction  of  the  principal  balance  of  the  Class  A-16  or  Class A-19
Certificates, the  aggregate amount  allocable to  such distributions  for  such
Subclass  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-16  or Class A-19 Certificates  are made by withdrawing,
from a non-interest bearing  account to be established  on the Closing Date  for
such  Subclasses  with a  $1,999.98 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 each Subclass upward to the next
higher  integral multiple  of $1,000.  On each  succeeding Distribution  Date on
which
 
- ------------------------
((1)) A "Deceased Holder" is a  Beneficial Owner of a  Class A-16 or Class  A-19
      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-16 or Class A-19
      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-16 or Class  A-19 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-16  or Class  A-19 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-16  Certificates or  Individual
      Class  A-19 Certificates greater than the  number of Individual Class A-16
      Certificates or  Individual Class  A-19  Certificates, as  applicable,  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-16 or Class
      A-19 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-16  or Class A-19  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-16 or  Class A-19  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-16 or  Class A-19 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-60
<PAGE>
distributions  in reduction of the principal balance  of the Class A-16 or Class
A-19 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 for such Subclass on the prior Distribution Date, and then the remainder
of such  allocable amount,  if any,  will be  similarly rounded  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 balances  of the Class  A-16
and  Class  A-19 Certificates  has  been reduced  to  zero. Thus,  the aggregate
distribution made in  reduction of the  principal balance of  each of the  Class
A-16  and Class A-19 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 each 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-16  or  Class  A-19
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-16 or Class  A-19
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
Certificates  of such Subclass 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-16 or  Class
A-19  Certificates  exceed the  aggregate amount  of distributions  requested by
Beneficial Owners of  Certificates of such  Subclass, 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-16 or Class A-19 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
balances of the Class A-16 and  Class A-19 Certificates (including amounts  paid
in  respect of  such losses under  the Policy) will  be made pro  rata among the
holders of Certificates  of each such  Subclass, respectively, 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-16 and Class  A-19 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-16  or  Class  A-19
Certificates  are made,  such distributions will  be made, with  respect to such
Subclass, 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 Certificates of such Subclass until all such requests  have
been honored.
 
                                      S-61
<PAGE>
    PROCEDURE  FOR REQUESTED DISTRIBUTIONS.  A Beneficial Owner may request that
distributions in reduction of the principal  balance of its Class A-16 or  Class
A-19 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-16  or Class  A-19 Certificates,  as applicable,  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 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-16  or Class  A-19 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-16 Certificate or  Individual Class A-19 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-16 or Class A-19 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-16 or Class  A-19 Certificates  are required to  forward such  notices to  the
Beneficial  Owners of such  Certificates. Individual Class  A-16 Certificates or
Individual Class A-19 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-16 or Class  A-19 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-16  AND  CLASS  A-19
CERTIFICATES.  To  the extent, if  any, that distributions  in reduction of  the
Class  A Subclass Principal Balance of the Class A-16 or Class A-19 Certificates
on a  Distribution  Date  exceed  the  outstanding  principal  balance  of  such
 
                                      S-62
<PAGE>
Subclass  with respect to which distribution  requests have been received by the
applicable date,  additional Certificates  of  such Subclass  in lots  equal  to
Individual  Class A-16  Certificates or  Individual Class  A-19 Certificates, as
applicable, 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-16  or  Class  A-19
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.
 
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.
 
                                      S-63
<PAGE>
THE FINANCIAL GUARANTY INSURANCE POLICIES
 
    The following summary of the provisions of the financial guaranty  insurance
policies  (one covering the  Class A-16 Certificates and  one covering the Class
A-19 Certificates) to be issued  by Financial Security (together, the  "Policy")
does not purport to be complete and is qualified in its entirety by reference to
the Policy.
 
    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-16  or Class  A-19  Certificates.  Under  the Policy,
Financial Security unconditionally and irrevocably guarantees to the Trustee for
the benefit of each holder of Class A-16 or Class A-19 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, 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
Certificate of such Subclass which distribution subsequently is avoided in whole
or in part as a preference payment under applicable law.
 
    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-16 or Class A-19 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-16  or  Class  A-19
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-16 or Class A-19 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-16  or  Class  A-19  Certificateholders  by  Financial  Security,  irrevocably
assigning  to Financial Security all rights  and claims of the Certificateholder
relating to or  arising under  the Certificates of  such Subclass  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-16  or
Class   A-19  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
 
                                      S-64
<PAGE>
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.
 
    "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-16  or Class  A-19 Certificates, as
applicable, is reduced to zero, (ii) any period during which any payment on  the
Class A-16 or Class A-19 Certificates, as applicable, 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-16 or Class A-19 Certificate to receive distributions on the Class A-16
or Class  A-19 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-16 or Class A-19 Certificates, as applicable. 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
 
                                      S-65
<PAGE>
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
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 March 31, 1996 (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
 
                                      S-66
<PAGE>
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 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
 
                                      S-67
<PAGE>
"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  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, the Class A-8 B Component, the Class A-9 A Component, the
Class A-9  B  Component,  the Class  A-10  A  Component and  the  Class  A-10  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 Unscheduled
Principal Receipts received after  the applicable Unscheduled Principal  Receipt
Period   for  the  current  Distribution  Date  that  are  applied  during  such
Unscheduled Principal  Receipt Period),  and (vi)  the amount  of the  remaining
Special Hazard Loss Amount, the Fraud Loss Amount and the Bankruptcy Loss Amount
as  of the close  of business on  such Distribution Date.  See "Servicing of the
Mortgage Loans -- Reports to Certificateholders" in the Prospectus.
 
    Copies of the foregoing  reports are available upon  written request to  the
Trust  Administrator at its  corporate trust office.  See "Pooling and Servicing
Agreement -- Trustee" herein.
 
SUBORDINATION OF CLASS 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.
 
                                      S-68
<PAGE>
    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 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 Unscheduled Principal Receipts (other than Prepayments
in Full)  with  respect to  Mortgage  Loans will  result  from the  priority  of
distributions  of the Pool Distribution Amount first to the holders of the Class
A Certificates 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
 
                                      S-69
<PAGE>
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, Class A-8,  Class
A-9 and Class A-10 Certificates) the Class A-6 Components, the Class A-7 Accrual
Component, the Class A-8 Components, the Class A-9 Components and the Class A-10
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 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,  Class A-8,  Class A-9 and
Class A-10  Certificates)  the  Class  A-6 Components,  the  Class  A-7  Accrual
Component, the Class A-8 Components, the Class A-9 Components and the Class A-10
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-17
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.
 
                                      S-70
<PAGE>
    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  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  $6,055,769) 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  $12,111,538) 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
 
                                      S-71
<PAGE>
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  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
$228,460) 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 $36,335,059, 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-72
<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  2,219
promissory  notes,  to have  an  aggregate unpaid  principal  balance as  of the
Cut-Off Date (the "Cut-Off Date  Aggregate Principal Balance") of  approximately
$605,576,880  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 0.03%  of the  Cut-Off Date Aggregate
Principal Balance of the Mortgage Loans will be secured by Co-op Shares and that
15 of the Mortgage Loans, representing  approximately 0.74% 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  $272,905. 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,  2,122 of  the Mortgaged  Properties, which secure
approximately 96.05%  of the  Cut-Off Date  Aggregate Principal  Balance of  the
Mortgage  Loans, are expected to be owner occupied primary residences, 96 of the
Mortgaged Properties,  which  secure approximately  3.94%  of the  Cut-Off  Date
Aggregate   Principal  Balance  of  the  Mortgage  Loans,  are  expected  to  be
 
- ------------------------
(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-73
<PAGE>
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
0.41% 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 717 Discount  Mortgage Loans having  an
aggregate  unpaid principal  balance of  approximately $210,174,442,  a range of
unpaid principal balances of approximately $19,957 to approximately $647,927, an
average unpaid principal balance of approximately $293,130, a range of  Mortgage
Interest  Rates from  6.250% to  7.750% per  annum, a  weighted average Mortgage
Interest Rate of approximately 7.469% per  annum, a range of remaining terms  to
stated  maturity of 237 months to 360  months, a weighted average remaining term
to  stated  maturity  of   approximately  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  74.41%  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 31.72% in California, 9.36% in New York and 8.24% in New Jersey.
 
    As of the Cut-Off  Date, there were 1,502  Premium Mortgage Loans having  an
aggregate  unpaid principal  balance of  approximately $395,402,438,  a range of
unpaid principal balances of approximately $29,961 to approximately  $1,951,167,
an  average  unpaid  principal balance  of  approximately $263,251,  a  range of
Mortgage Interest Rates  from 7.875%  to 9.750%  per annum,  a weighted  average
Mortgage  Interest Rate of approximately 8.329%  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  76.90%  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 36.66% in California, 9.73% in New York,
6.94% in New Jersey and 5.44% in Florida.
 
                                      S-74
<PAGE>
    The Mortgage  Loans will  have  been acquired  by  the Seller  from  Norwest
Mortgage.  On May 7, 1996  Norwest Mortgage and an  affiliate acquired from PHMC
certain mortgage loans and  a substantial portion  of PHMC's mortgage  servicing
portfolio  (such  transaction,  the  "PHMC  Acquisition").  The  Mortgage  Loans
included in the Trust Estate consist of (i) Mortgage Loans originated by Norwest
Mortgage or an affiliate or purchased  by Norwest Mortgage or an affiliate  from
originators  other than PHMC and (ii)  Mortgage Loans originated or purchased by
PHMC and acquired by Norwest Mortgage or  an affiliate from PHMC as part of  the
PHMC  Acquisition. See "Norwest Mortgage" in  the Prospectus. The Mortgage Loans
that were not  originated by Norwest  Mortgage or acquired  by Norwest  Mortgage
from  PHMC  were  acquired by  Norwest  Mortgage  or an  affiliate  from various
entities (each, a "Norwest Correspondent") which either originated the  Mortgage
Loans or acquired the Mortgage Loans pursuant to mortgage loan purchase programs
operated  by such Norwest Correspondents. The Mortgage Loans acquired by Norwest
Mortgage from PHMC that were not originated  by PHMC were acquired by PHMC  from
various  entities  (each a  "PHMC  Correspondent") which  either  originated the
Mortgage Loans or acquired the Mortgage Loans pursuant to mortgage loan purchase
programs operated by such PHMC Correspondents. Approximately 97.25% (by  Cut-Off
Date  Aggregate  Principal Balance)  of the  Mortgage  Loans were  originated in
conformity with the underwriting standards described in the Prospectus under the
heading "The Mortgage  Loan Programs  -- Mortgage Loan  Underwriting --  Norwest
Mortgage  Underwriting" (the "Underwriting Standards") and as applied by Norwest
Mortgage, PHMC, or by eligible originators to whom Norwest Mortgage or PHMC  had
delegated  all underwriting functions.  In certain instances,  exceptions to the
Underwriting Standards may have been granted by Norwest Mortgage or by PHMC. See
"The Mortgage Loan Programs  -- Mortgage Loan  Underwriting" in the  Prospectus.
Approximately  0.04% and 0.82% (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 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"  and, based on the  credit scores of such  Mortgage Loans, some of
such Mortgage Loans  were re-underwritten. The  remaining approximate 1.89%  (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  71.92%  (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
28.08%  (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-75
<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       $    295,062.73        0.05   %
6.500%.............................        3            815,573.48        0.13
6.875%.............................       15          3,626,087.98        0.60
7.000%.............................       21          5,760,650.49        0.95
7.125%.............................       53         14,822,104.59        2.45
7.250%.............................       87         27,622,092.87        4.56
7.375%.............................      111         32,330,345.73        5.34
7.500%.............................      145         43,059,257.82        7.11
7.625%.............................      114         33,649,901.21        5.56
7.750%.............................      167         48,193,365.48        7.96
7.875%.............................      206         62,566,249.78       10.34
8.000%.............................      163         43,475,044.68        7.18
8.125%.............................      130         36,628,235.64        6.05
8.250%.............................      217         58,634,866.74        9.68
8.375%.............................      187         51,170,821.48        8.45
8.500%.............................      183         47,989,962.56        7.92
8.625%.............................      141         35,473,004.58        5.86
8.750%.............................      107         26,528,024.52        4.38
8.875%.............................       76         15,665,118.92        2.59
9.000%.............................       43          8,446,390.53        1.39
9.125%.............................       17          3,122,116.14        0.52
9.250%.............................       17          3,400,339.13        0.56
9.375%.............................        8          1,171,351.06        0.19
9.500%.............................        5            573,172.45        0.09
9.750%.............................        2            557,739.67        0.09
                                       -----       ---------------     -------
        Total......................    2,219       $605,576,880.26      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    As of the Cut-Off Date, the  weighted average Mortgage Interest Rate of  the
Mortgage  Loans  is  expected to  be  approximately  8.030% 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 7.760% per annum.
 
                                      S-76
<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        0.02   %
237................................        4          1,126,609.54        0.19
238................................        6          1,555,969.33        0.26
239................................        5          1,339,132.27        0.22
269................................        1            206,043.38        0.03
271................................        1            386,807.63        0.06
272................................        3            894,375.12        0.15
273................................        3            827,635.16        0.14
277................................        1            188,396.24        0.03
278................................        1            232,313.83        0.04
280................................        1            342,590.89        0.06
298................................        1            220,972.83        0.04
316................................        1            249,546.22        0.04
326................................        1            203,144.32        0.03
328................................        1          1,951,166.86        0.32
339................................        1            187,529.05        0.03
342................................        1            107,055.06        0.02
344................................        3            726,349.31        0.12
346................................        3            574,974.64        0.09
347................................        3            488,203.48        0.08
348................................        8          2,105,502.65        0.35
349................................        7          1,139,232.42        0.19
350................................       14          4,394,911.91        0.73
351................................        9          2,346,284.83        0.39
352................................       27          7,301,879.94        1.21
353................................       15          3,903,205.20        0.64
354................................       59         13,223,672.57        2.18
355................................       60         15,684,374.93        2.59
356................................      185         49,288,290.54        8.14
357................................      644        172,354,285.80       28.46
358................................      752        211,185,411.45       34.87
359................................      365        101,351,101.88       16.74
360................................       32          9,341,250.00        1.54
                                       -----       ---------------     -------
        Total......................    2,219       $605,576,880.26      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-77
<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        0.03   %
1989...............................       10          2,872,118.87        0.47
1992...............................        1            249,546.22        0.04
1993...............................        2          2,154,311.18        0.36
1994...............................        3            553,279.05        0.09
1995...............................      142         34,694,992.21        5.73
1996...............................    2,060        564,846,589.35       93.28
                                       -----       ---------------     -------
        Total......................    2,219       $605,576,880.26      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
June 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........................       94       $ 27,689,202.38        4.57   %
50.01-55.00%.......................       48         12,800,779.84        2.11
55.01-60.00%.......................       72         20,178,097.12        3.33
60.01-65.00%.......................      100         28,861,140.90        4.77
65.01-70.00%.......................      188         56,294,840.40        9.30
70.01-75.00%.......................      286         78,466,485.97       12.96
75.01-80.00%.......................      944        253,201,655.71       41.80
80.01-85.00%.......................       57         15,907,886.26        2.63
85.01-90.00%.......................      335         89,171,261.13       14.73
90.01-95.00%.......................       95         23,005,530.55        3.80
                                       -----       ---------------     -------
        Total......................    2,219       $605,576,880.26      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 76.04%. 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 125 of the Mortgage
Loans having Loan-to-Value Ratios at origination in excess of 80%,  representing
approximately  5.68%  (by  Cut-Off  Date  Aggregate  Principal  Balance)  of the
Mortgage Loans, were originated without primary mortgage insurance.
 
                                      S-78
<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.................    1,449       $439,456,466.12       72.57   %
Asset and Mortgage Verification....      460         76,290,822.68       12.60
Income and Mortgage Verification...       81         22,948,555.01        3.79
Asset Verification.................       29          9,031,698.50        1.49
Income Verification................        0                  0.00        0.00
Mortgage Verification..............      186         55,012,628.12        9.08
Preferred Processing...............       14          2,836,709.83        0.47
                                       -----       ---------------     -------
        Total......................    2,219       $605,576,880.26      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    Documentation levels  vary depending  upon several  factors, including  loan
amount,  Loan-to-Value  Ratio and  the type  and purpose  of the  Mortgage Loan.
Asset, income  and  mortgage  verifications were  obtained  for  Mortgage  Loans
processed  with  "full documentation."  In the  case of  "preferred processing,"
neither  asset,  income  nor  mortgage  verifications  were  obtained.  In  most
instances,  a verification of  the borrower's employment  was obtained. However,
for all of the Mortgage  Loans, a credit report on  the borrower and a  property
appraisal  were  obtained.  See "The  Mortgage  Loan Programs  --  Mortgage Loan
Underwriting" in the Prospectus.
 
                   ORIGINAL MORTGAGE LOAN PRINCIPAL BALANCES
 
<TABLE>
<CAPTION>
                                                                    PERCENTAGE OF
                                                      AGGREGATE      CUT-OFF DATE
                                       NUMBER          UNPAID         AGGREGATE
ORIGINAL MORTGAGE LOAN PRINCIPAL     OF MORTGAGE      PRINCIPAL       PRINCIPAL
BALANCE                                 LOANS          BALANCE         BALANCE
- -----------------------------------  -----------   ---------------  --------------
<S>                                  <C>           <C>              <C>
Less than or equal to $200,000.....      379       $ 43,354,544.52        7.16   %
$200,001-$250,000..................      582        134,360,050.34       22.19
$250,001-$300,000..................      567        154,815,218.50       25.56
$300,001-$350,000..................      291         94,386,074.77       15.59
$350,001-$400,000..................      180         67,361,098.21       11.12
$400,001-$450,000..................       83         35,259,341.90        5.82
$450,001-$500,000..................       67         32,259,021.07        5.33
$500,001-$550,000..................       26         13,720,339.92        2.27
$550,001-$600,000..................       26         14,965,983.40        2.47
$600,001-$650,000..................        9          5,706,453.48        0.94
$700,001-$750,000..................        1            749,533.83        0.12
$850,001-$900,000..................        2          1,746,123.79        0.29
$900,001-$950,000..................        1            948,261.20        0.16
$950,001-$1,000,000................        4          3,993,668.47        0.66
Over $ 1 Million...................        1          1,951,166.86        0.32
                                       -----       ---------------     -------
        Total......................    2,219       $605,576,880.26      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
    As of the Cut-Off Date, the average unpaid principal balance of the Mortgage
Loans is expected  to be  approximately $272,905. 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 61.72%
and  80.00%,  respectively. See  "The Trust  Estates --  Mortgage Loans"  in the
Prospectus.
 
                                      S-79
<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.............    2,090       $577,656,863.02       95.39   %
Two- to four-family units..........        7          1,970,781.68        0.33
Condominiums
  High-rise (greater than four
   stories)........................       16          3,914,949.91        0.65
  Low-rise (four stories or
   less)...........................       73         13,579,726.93        2.24
Planned unit developments..........       28          7,218,749.28        1.19
Townhouses.........................        4          1,028,959.27        0.17
Cooperative Units..................        1            206,850.17        0.03
                                       -----       ---------------     -------
        Total......................    2,219       $605,576,880.26      100.00   %
                                       -----       ---------------     -------
                                       -----       ---------------     -------
</TABLE>
 
                                      S-80
<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        0.23   %
Arizona............................       48         12,018,775.84        1.98
Arkansas...........................        7          1,965,576.69        0.32
California.........................      727        211,616,179.68       34.94
Colorado...........................       72         17,903,237.62        2.96
Connecticut........................       50         13,532,438.15        2.23
Delaware...........................        8          2,236,095.92        0.37
District of Columbia...............        7          1,905,129.31        0.31
Florida............................      118         26,870,421.95        4.44
Georgia............................       50         12,301,769.30        2.03
Hawaii.............................       28         11,924,089.70        1.97
Idaho..............................        8          1,726,230.93        0.29
Illinois...........................       37         11,454,967.16        1.89
Indiana............................        3            768,429.59        0.13
Iowa...............................        5          1,564,221.26        0.26
Kansas.............................        1            238,090.98        0.04
Kentucky...........................        3            852,443.15        0.14
Louisiana..........................       12          3,473,678.90        0.57
Maine..............................        2            499,015.14        0.08
Maryland...........................       65         18,234,208.05        3.01
Massachusetts......................       70         17,221,679.08        2.84
Michigan...........................       12          3,849,682.62        0.64
Minnesota..........................       58         16,098,704.86        2.66
Mississippi........................        4            939,180.48        0.16
Missouri...........................        3            898,825.31        0.15
Montana............................        5          1,475,943.60        0.24
Nebraska...........................        5          1,000,478.42        0.17
Nevada.............................       27          7,015,020.36        1.16
New Hampshire......................        2            452,356.68        0.07
New Jersey.........................      167         44,743,654.76        7.39
New Mexico.........................       13          3,495,930.91        0.58
New York...........................      233         58,157,513.19        9.60
North Carolina.....................       23          6,090,075.13        1.01
North Dakota.......................        1            141,655.00        0.02
Ohio...............................       15          3,913,695.05        0.65
Oklahoma...........................        9          2,011,931.77        0.33
Oregon.............................       39         10,539,065.57        1.74
Pennsylvania.......................       49         11,256,450.45        1.86
Rhode Island.......................        9          2,205,573.43        0.36
South Carolina.....................        5          1,111,779.23        0.18
South Dakota.......................        1            284,653.46        0.05
Tennessee..........................       20          6,045,614.93        1.00
Texas..............................       73         19,693,203.90        3.25
Utah...............................       23          6,821,252.08        1.13
Vermont............................        3            831,319.02        0.14
Virginia...........................       58         16,669,872.20        2.75
Washington.........................       31          9,089,436.98        1.50
Wisconsin..........................        3            542,065.93        0.09
Wyoming............................        2            523,116.58        0.09
                                     -----------   ---------------     -------
        Total......................    2,219       $605,576,880.26      100.00   %
                                     -----------   ---------------     -------
                                     -----------   ---------------     -------
</TABLE>
 
    No more than  approximately 0.88%  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-81
<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............    1,201       $341,056,697.73       56.32   %
Other Originators..................    1,018        264,520,182.53       43.68
                                       -----       ---------------     -------
        Total......................    2,219       $605,576,880.26      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...........................    1,292       $330,366,960.81       54.55   %
Equity Take Out Refinance..........      183         50,843,071.76        8.40
Rate/Term Refinance................      744        224,366,847.69       37.05
                                       -----       ---------------     -------
        Total......................    2,219       $605,576,880.26      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        0.16
  (less than five years)...........        5          1,538,856.79        0.25
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        0.41   %
                                           -
                                           -
                                                   ---------------         ---
                                                   ---------------         ---
</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-82
<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
 
    Subject  to certain  limitations, the  Seller may,  in its  sole discretion,
repurchase any defaulted Mortgage Loan, or any Mortgage Loan as to which default
is reasonably foreseeable, from the Trust Estate at a price equal to the  unpaid
principal  balance of  such Mortgage Loan,  together with accrued  interest at a
rate equal to the Mortgage  Interest Rate through the last  day of the month  in
which  such  repurchase  occurs. See  "The  Pooling and  Servicing  Agreement --
Optional Purchases" in the Prospectus. A  Servicer may, in its sole  discretion,
allow  the assumption  of a defaulted  Mortgage Loan serviced  by such Servicer,
subject to certain conditions specified  in the applicable Underlying  Servicing
Agreement,  or  encourage  the refinancing  of  a defaulted  Mortgage  Loan. See
"Prepayment and  Yield Considerations"  herein and  "Servicing of  the  Mortgage
Loans -- Enforcement of Due-on-Sale Clauses; Realization Upon Defaulted Mortgage
Loans" in the Prospectus.
 
                     DELINQUENCY AND FORECLOSURE EXPERIENCE
 
    The  following  tables  set  forth  certain  information  concerning  recent
delinquency, foreclosure  and  loan  loss experience  on  (i)  the  conventional
mortgage  loans included in Norwest Mortgage's mortgage loan servicing portfolio
which were originated by Norwest Mortgage for its own account or the account  of
an affiliate, which were acquired by Norwest Mortgage for its own account or for
the  account  of an  affiliate  or as  to  which Norwest  Mortgage  acquired the
servicing rights  (other  than from  PHMC)  (the "NMI  Portfolio  Loans"),  (ii)
conventional mortgage loans included in PHMC's mortgage loan servicing portfolio
prior  to  the PHMC  Acquisition (the  "PHMC Portfolio  Loans"), (iii)  the PHMC
Portfolio Loans  which  are fixed  interest  rate mortgage  loans  ("Fixed  PHMC
Portfolio  Loans"),  including,  in  both cases,  mortgage  loans  originated in
connection with the purchases of residences by relocated employees  ("Relocation
Mortgage  Loans")  and  (iv)  the  Fixed PHMC  Portfolio  Loans  other  than the
Relocation Mortgage Loans  ("Fixed Non-relocation PHMC  Portfolio Loans"). As  a
consequence  of the  PHMC Acquisition,  all of  the PHMC  Portfolio Loans became
serviced or subserviced by Norwest Mortgage on May 7, 1996. See "Description  of
the  Mortgage Loans"  herein and  "The Mortgage  Loan Programs  -- Mortgage Loan
Underwriting" in  the Prospectus.  The delinquency,  foreclosure and  loan  loss
experience  represents the recent experience of Norwest Mortgage and PHMC. There
can be no assurance that the  delinquency, foreclosure and loan loss  experience
set forth with respect to the PHMC Portfolio Loans or NMI Portfolio Loans, which
include  both fixed and adjustable interest rate mortgage loans and loans having
a variety of  original terms  to stated maturity  including Relocation  Mortgage
Loans  and non-relocation mortgage loans, and  the Fixed PHMC Portfolio Loans or
Fixed Non-relocation PHMC Portfolio Loans, each of which includes loans having a
variety of payment characteristics,  such as Subsidy  Loans, Buy-Down Loans  and
Balloon  Loans, will  be representative of  the results that  may be experienced
with respect to the Mortgage Loans included in the Trust Estate.
 
    Historically, Relocation  Mortgage  Loans, which  constitute  a  significant
percentage  of the PHMC Portfolio Loans,  have experienced a significantly lower
rate of delinquency and  foreclosure than other mortgage  loans included in  the
PHMC  Portfolio Loans and Fixed PHMC Portfolio  Loans. There can be no assurance
that the future experience on the Mortgage Loans contained in the Trust  Estate,
all  of which are  fixed interest rate  mortgage loans having  original terms to
stated maturity ranging from approximately 20 to approximately 30 years and none
of which are Relocation Mortgage  Loans, will be comparable  to that of the  NMI
Portfolio Loans, the PHMC Portfolio Loans, the Fixed PHMC Portfolio Loans or the
Fixed Non-relocation PHMC Portfolio Loans.
 
    The  following tables reflect rapid growth  during recent periods in Norwest
Mortgage's mortgage loan servicing  portfolio as a  result of the  substantially
higher volume of new loan originations and
 
                                      S-83
<PAGE>
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-84
<PAGE>
                           TOTAL NMI PORTFOLIO LOANS
<TABLE>
<CAPTION>
                                                          BY NO.       BY NO.       BY NO.
                                                         OF LOANS     OF LOANS     OF LOANS
                                                        -----------  -----------  -----------
                                                           AS OF        AS OF
                                                         DECEMBER     DECEMBER       AS OF
                                                            31,          31,       MARCH 31,
                                                           1994         1995         1996
                                                        -----------  -----------  -----------
<S>                                                     <C>          <C>          <C>
Total NMI Portfolio Loans.............................     391,838      555,855      594,028
                                                        -----------  -----------  -----------
                                                        -----------  -----------  -----------
 
Period of Delinquency (1)
  30 to 59 days.......................................       5,271        8,397        7,076
  60 to 89 days.......................................         924        1,653        1,459
  90 days or more.....................................         778        1,476        1,303
                                                        -----------  -----------  -----------
Total Delinquent Loans................................       6,973       11,526        9,838
                                                        -----------  -----------  -----------
                                                        -----------  -----------  -----------
 
Percent of NMI Portfolio Loans........................        1.78%        2.07%        1.66%
 
<CAPTION>
 
                                                           AS OF        AS OF        AS OF
                                                         DECEMBER     DECEMBER     MARCH 31,
                                                         31, 1994     31, 1995       1996
                                                        -----------  -----------  -----------
<S>                                                     <C>          <C>          <C>
Foreclosures (2)......................................       1,717        2,312        2,656
Foreclosure Ratio (3).................................        0.44%        0.42%        0.45%
<CAPTION>
 
                                                                                     THREE
                                                                                    MONTHS
                                                        YEAR ENDED   YEAR ENDED      ENDED
                                                         DECEMBER     DECEMBER     MARCH 31,
                                                         31, 1994     31, 1995       1996
                                                        -----------  -----------  -----------
                                                            (DOLLAR AMOUNTS IN THOUSANDS)
<S>                                                     <C>          <C>          <C>
Net Gain (Loss) (4)...................................   $  (2,693)   $  (4,699)   $    (975)
Net Gain (Loss) Ratio (5).............................      (0.008)%     (0.009)%     (0.002)%
</TABLE>
 
- ------------------------
(1) The  indicated periods of delinquency  are based on the  number of days past
    due, based on a 30-day month. No mortgage loan is considered delinquent  for
    these  purposes until one month has passed since its contractual due date. A
    mortgage  loan  is   no  longer  considered   delinquent  once   foreclosure
    proceedings have commenced.
 
(2) Includes loans in the applicable portfolio for which foreclosure proceedings
    had  been instituted or with respect to  which the related property had been
    acquired as of the dates indicated.
 
(3) Foreclosures as a percentage of total  loans in the applicable portfolio  at
    the end of each period.
 
(4) Does  not  include gain  or loss  with  respect to  loans in  the applicable
    portfolio for  which foreclosure  proceedings had  been instituted  but  not
    completed  as of  the dates indicated,  or for which  the related properties
    have been acquired in foreclosure proceedings but not yet sold.
 
(5) Net gain (loss) as a percentage  of total loans in the applicable  portfolio
    at the end of each period.
 
                                      S-85
<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-86
<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-87
<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-88
<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-89
<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-90
<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-17  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 is 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-91
<PAGE>
carefully consider the associated risks, including, in the case of any  Subclass
of  Offered Certificates  purchased at a  discount, particularly  the Class A-17
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-17 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  on  the  basis  of  the
characteristics  of the Mortgage Loans  that are expected to  be included in the
Trust Estate, as described above under "Description of the Mortgage Loans."  The
tables  assume, among other things, that (i) the scheduled payment in each month
for each Mortgage Loan has been based on its outstanding balance as of the first
day of the month preceding the month of such payment, its Mortgage Interest Rate
and its remaining term to stated maturity, so that such scheduled payments would
amortize the remaining balance by its
 
                                      S-92
<PAGE>
remaining term to  maturity, (ii)  scheduled monthly payments  of principal  and
interest  on the Mortgage Loans will be timely received on the first day of each
month (with no defaults), commencing in  August 1996, (iii) the Seller does  not
repurchase  any Mortgage Loan,  as described under  "Description of the Mortgage
Loans -- Mandatory Repurchase or Substitution of Mortgage Loans" herein, and the
Seller does not exercise its option  to purchase the Mortgage Loans and  thereby
cause  a termination of the Trust Estate,  (iv) principal prepayments in full on
the Mortgage Loans will be received on the last day of each month commencing  in
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,  (v) the Series 1996-1 Certificates will be issued on July 25, 1996,
(vi) distributions to Certificateholders  will be made on  the 25th day of  each
month,  commencing in August 1996 and (vii)  distributions on the Class A-16 and
Class A-19 Certificates on each Distribution Date  will be made pro rata to  the
holders  of the Class A-16 or Class  A-19 Certificates based on their respective
Percentage Interests in such Subclass and without rounding or the benefit of the
Rounding Account.
 
    IT IS HIGHLY UNLIKELY  THAT THE MORTGAGE LOANS  WILL PREPAY AT ANY  CONSTANT
RATE,  THAT ALL OF THE MORTGAGE  LOANS WILL PREPAY AT THE  SAME RATE OR THAT THE
MORTGAGE LOANS  WILL  NOT EXPERIENCE  ANY  LOSSES.  In addition,  there  may  be
differences  between  the  characteristics  of  the  mortgage  loans  ultimately
included in the  Trust Estate and  the Mortgage  Loans which are  assumed to  be
included,  as described above. Any difference may have an effect upon the actual
percentages of initial Class A Subclass  Principal Balance of the Subclasses  of
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-93
<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            1            1            1            0
                                                                                                              100          100
July 1999...........................           0            0            0            0            0
                                                                                                               51            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         1.25         1.25         1.25         1.23         3.06         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           48
                                                                                    100          100          100          100
July 1999...........................
                                               0            0            0
                                                                                    100           91           91           35
July 2000...........................
                                               0            0            0
                                                                                     78            2            2            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         2.42         2.04         4.45         3.50         3.50         2.96
 
<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)..................        2.34
</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-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          94
July 2002...........................           7            0            0            0            0
                                                                                                              100          47
July 2003...........................           0            0            0            0            0
                                                                                                               54           3
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)..................        5.64         4.49         4.49         3.47         2.63         7.11        5.99
 
<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          90           90
July 1998...........................
                                             100          100          100
                                                                                    93         91          68           40
July 1999...........................
                                             100          100           59
                                                                                    91         91          49            0
July 2000...........................
                                             100           70            0
                                                                                    91         91          33            0
July 2001...........................
                                              94            0            0
                                                                                    91         91          19            0
July 2002...........................
                                              47            0            0
                                                                                    91         91           9            0
July 2003...........................
                                               3            0            0
                                                                                    91         91           1            0
July 2004...........................
                                               0            0            0
                                                                                    91         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)..................        5.99         4.29         3.11        7.90       7.20        3.23         1.83
 
<CAPTION>
 
            DISTRIBUTION
                DATE                     500%
- ------------------------------------
Initial.............................
 
                                             100
July 1997...........................
 
                                              90
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)..................        1.52
</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-95
<PAGE>
       PERCENTAGE OF INITIAL SUBCLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                 CLASS A-8, CLASS A-9 AND CLASS A-10                       CLASS A-11
                                                         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          78           42
                                                                                                       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          42            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         94           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         23           0            0
                                                                                                       100        100        100
July 2015...........................        100        100         10           0            0
                                                                                                       100        100        100
July 2016...........................        100         96          0           0            0
                                                                                                       100        100         97
July 2017...........................        100         76          0           0            0
                                                                                                       100        100         81
July 2018...........................        100         57          0           0            0
                                                                                                       100        100         66
July 2019...........................        100         39          0           0            0
                                                                                                       100        100         53
July 2020...........................        100         22          0           0            0
                                                                                                       100        100         42
July 2021...........................        100          5          0           0            0
                                                                                                       100        100         32
July 2022...........................        100          0          0           0            0
                                                                                                       100         84         24
July 2023...........................        100          0          0           0            0
                                                                                                       100         60         16
July 2024...........................         66          0          0           0            0
                                                                                                       100         38         10
July 2025...........................          0          0          0           0            0
                                                                                                        93         16          4
July 2026...........................          0          0          0           0            0
                                                                                                         0          0          0
Weighted Average
  Life (years) (1)..................      28.27      22.49      16.45        3.17         0.90       29.42      27.53      23.80
 
<CAPTION>
                                                                                        CLASS A-12
                                                                                    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
                                                                      90           68           52           24            0
 
July 1998...........................
                                            100         100
                                                                      80           10            0            0            0
 
July 1999...........................
                                            100         100
                                                                      69            0            0            0            0
 
July 2000...........................
                                            100         100
                                                                      59            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         100
                                                                      28            0            0            0            0
 
July 2004...........................
                                            100          64
                                                                      15            0            0            0            0
 
July 2005...........................
                                            100          41
                                                                       2            0            0            0            0
 
July 2006...........................
                                            100          28
                                                                       0            0            0            0            0
 
July 2007...........................
                                            100          19
                                                                       0            0            0            0            0
 
July 2008...........................
                                            100          13
                                                                       0            0            0            0            0
 
July 2009...........................
                                             93           9
                                                                       0            0            0            0            0
 
July 2010...........................
                                             74           6
                                                                       0            0            0            0            0
 
July 2011...........................
                                             58           4
                                                                       0            0            0            0            0
 
July 2012...........................
                                             46           3
                                                                       0            0            0            0            0
 
July 2013...........................
                                             36           2
                                                                       0            0            0            0            0
 
July 2014...........................
                                             28           1
                                                                       0            0            0            0            0
 
July 2015...........................
                                             22           1
                                                                       0            0            0            0            0
 
July 2016...........................
                                             17           1
                                                                       0            0            0            0            0
 
July 2017...........................
                                             13           *
                                                                       0            0            0            0            0
 
July 2018...........................
                                             10           *
                                                                       0            0            0            0            0
 
July 2019...........................
                                              7           *
                                                                       0            0            0            0            0
 
July 2020...........................
                                              5           *
                                                                       0            0            0            0            0
 
July 2021...........................
                                              4           *
                                                                       0            0            0            0            0
 
July 2022...........................
                                              2           *
                                                                       0            0            0            0            0
 
July 2023...........................
                                              2           *
                                                                       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)..................      16.72        9.44         4.85         1.33         1.01         0.76         0.57
 
</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-96
<PAGE>
       PERCENTAGE OF INITIAL SUBCLASS PRINCIPAL BALANCE OUTSTANDING FOR:
<TABLE>
<CAPTION>
                                                                                                          CLASS A-14
                                                               CLASS A-13                            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           95
                                                                                                           100        100
July 1998...........................        100         100           90           70           39
                                                                                                           100        100
July 1999...........................        100          84           62           27            0
                                                                                                           100        100
July 2000...........................        100          68           37            0            0
                                                                                                           100        100
July 2001...........................        100          52           15            0            0
                                                                                                           100        100
July 2002...........................        100          39            0            0            0
                                                                                                           100        100
July 2003...........................        100          27            0            0            0
                                                                                                           100        100
July 2004...........................        100          16            0            0            0
                                                                                                           100        100
July 2005...........................        100           6            0            0            0
                                                                                                           100        100
July 2006...........................         97           0            0            0            0
                                                                                                           100         93
July 2007...........................         93           0            0            0            0
                                                                                                           100         74
July 2008...........................         89           0            0            0            0
                                                                                                           100         56
July 2009...........................         84           0            0            0            0
                                                                                                           100         39
July 2010...........................         79           0            0            0            0
                                                                                                           100         24
July 2011...........................         73           0            0            0            0
                                                                                                           100          9
July 2012...........................         67           0            0            0            0
                                                                                                           100          0
July 2013...........................         60           0            0            0            0
                                                                                                           100          0
July 2014...........................         52           0            0            0            0
                                                                                                           100          0
July 2015...........................         44           0            0            0            0
                                                                                                           100          0
July 2016...........................         36           0            0            0            0
                                                                                                           100          0
July 2017...........................         26           0            0            0            0
                                                                                                           100          0
July 2018...........................         16           0            0            0            0
                                                                                                           100          0
July 2019...........................          5           0            0            0            0
                                                                                                           100          0
July 2020...........................          0           0            0            0            0
                                                                                                            83          0
July 2021...........................          0           0            0            0            0
                                                                                                            53          0
July 2022...........................          0           0            0            0            0
                                                                                                            20          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)..................      17.73        5.45         3.58         2.50         1.84       25.10      12.49
 
<CAPTION>
 
                                                                                              CLASS A-15
                                                                                         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           49
                                                                                   100        100        100         100
July 2000...........................
                                             100           81            0
                                                                                   100        100        100         100
July 2001...........................
                                             100           15            0
                                                                                   100        100        100         100
July 2002...........................
                                              92            0            0
                                                                                   100        100        100          37
July 2003...........................
                                              57            0            0
                                                                                   100        100        100           0
July 2004...........................
                                              28            0            0
                                                                                   100        100        100           0
July 2005...........................
                                               5            0            0
                                                                                   100        100        100           0
July 2006...........................
                                               0            0            0
                                                                                   100        100         71           0
July 2007...........................
                                               0            0            0
                                                                                   100        100         36           0
July 2008...........................
                                               0            0            0
                                                                                   100        100          6           0
July 2009...........................
                                               0            0            0
                                                                                   100        100          0           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         89          0           0
July 2013...........................
                                               0            0            0
                                                                                   100         62          0           0
July 2014...........................
                                               0            0            0
                                                                                   100         37          0           0
July 2015...........................
                                               0            0            0
                                                                                   100         13          0           0
July 2016...........................
                                               0            0            0
                                                                                   100          0          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
                                                                                    67          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)..................        7.37         4.51         3.04       27.26      17.55      10.67        5.90
 
<CAPTION>
 
            DISTRIBUTION
                DATE                     500%
- ------------------------------------
Initial.............................
 
                                             100
July 1997...........................
 
                                             100
July 1998...........................
 
                                             100
July 1999...........................
 
                                             100
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)..................        3.75
</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-16(2), CLASS A-17
                                                         AND CLASS A-19(2)                               CLASS A-18
                                                        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          98
                                                                                                     100        100        100
July 2001...........................         98         98         98         98          42
                                                                                                     100        100        100
July 2002...........................         96         96         96         96          12
                                                                                                      99         97         95
July 2003...........................         95         95         95         82           0
                                                                                                      97         93         90
July 2004...........................         94         94         94         61           0
                                                                                                      96         88         83
July 2005...........................         93         93         93         47           0
                                                                                                      94         82         74
July 2006...........................         92         92         92         38           0
                                                                                                      92         76         65
July 2007...........................         90         90         90         30           0
                                                                                                      90         70         57
July 2008...........................         89         89         89         24           0
                                                                                                      88         64         50
July 2009...........................         88         88         80         19           0
                                                                                                      85         59         43
July 2010...........................         87         87         69         15           0
                                                                                                      83         53         38
July 2011...........................         86         86         60         12           0
                                                                                                      80         49         33
July 2012...........................         84         84         52         10           0
                                                                                                      77         44         28
July 2013...........................         83         83         44          8           0
                                                                                                      74         40         24
July 2014...........................         82         82         38          6           0
                                                                                                      70         35         21
July 2015...........................         81         81         32          5           0
                                                                                                      66         31         17
July 2016...........................         80         76         27          4           0
                                                                                                      62         28         15
July 2017...........................         78         66         22          3           0
                                                                                                      58         24         12
July 2018...........................         77         57         18          2           0
                                                                                                      53         21         10
July 2019...........................         76         48         15          1           0
                                                                                                      48         18          8
July 2020...........................         75         40         12          1           0
                                                                                                      42         15          6
July 2021...........................         74         32          9          1           0
                                                                                                      36         12          5
July 2022...........................         72         25          7          1           0
                                                                                                      30          9          4
July 2023...........................         71         18          5          *           0
                                                                                                      23          7          2
July 2024...........................         65         11          3          *           0
                                                                                                      15          4          1
July 2025...........................         30          5          1          *           0
                                                                                                       7          2          1
July 2026...........................          0          0          0          0           0
                                                                                                       0          0          0
Weighted Average
  Life (years) (1)..................      24.88      21.70      16.92      10.19        5.03       21.20      15.74      13.36
 
<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          69
                                                                    100        100        100        100        100
July 2004...........................
                                             74          43
                                                                    100        100        100        100        100
July 2005...........................
                                             62          27
                                                                    100        100        100        100        100
July 2006...........................
                                             50          19
                                                                    100        100        100        100        100
July 2007...........................
                                             40          13
                                                                    100        100        100        100        100
July 2008...........................
                                             32           9
                                                                    100        100        100        100        100
July 2009...........................
                                             26           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        8.40       30.00      30.00      30.00      29.98      29.71
</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-16  or  Class  A-19
    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-16 or Class A-19 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 beginning on page
S-92, 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,   August   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 beginning on page S-92. 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 LIVES  OF THE  CLASS  A-8, CLASS  A-9 AND  CLASS  A-10
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, the Class A-8 B Component, the Class A-9 A Component, the Class A-9 B
Component,  the Class A-10  A Component and  the Class A-10  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, the
Class A-8 B Component, the Class A-9 A Component, the Class A-9 B Component, the
Class A-10 A Component and the Class A-10 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, Class A-9 and Class A-10 Certificates support the Class A-7
Accrual  Component. In addition, under relatively slow prepayment scenarios, the
Class A-8 A Component, the Class A-8 B Component, the Class A-9 A Component, the
Class A-9 B Component, the Class A-10 A Component and the Class A-10 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,  Class A-9 and Class  A-10
Certificates support the Scheduled Certificates and the Class A-6 Components.
 
    THE   CLASS  A-16  AND  CLASS  A-19  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
 
                                      S-99
<PAGE>
PRINCIPAL  PAYMENTS. THERE IS NO ASSURANCE THAT  ANY INVESTOR IN A CLASS A-16 OR
CLASS A-19 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-16 AND  CLASS A-19 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 -- 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 beginning on page  S-92
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-17 CERTIFICATES
 
    THE YIELD  TO AN  INVESTOR IN  THE CLASS  A-17 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-17 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-17 Certificates. Such calculations  are
based on distributions made in accordance with "Description of the Certificates"
above,  on the  assumptions described  in clauses (i)  through (vi)  of the last
paragraph beginning on  page S-92 and  on the further  assumptions that (i)  the
Class  A-17 Certificates  will be  purchased on  July 25,  1996 at  an aggregate
purchase price of 40% of the initial  Class A Subclass Principal Balance of  the
Class  A-17 Certificates  and (ii)  distributions to  holders of  the Class A-17
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-17 CERTIFICATES TO PREPAYMENTS
 
<TABLE>
<CAPTION>
                                               PERCENTAGES OF SPA
                                ------------------------------------------------
 
                                   0%       100%      175%      300%      500%
                                --------  --------  --------  --------  --------
<S>                             <C>       <C>       <C>       <C>       <C>
Pre-Tax Yield (CBE)...........     3.91 %    4.46 %    5.78 %    9.86 %   19.29 %
</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-17  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-17  Certificates   of
approximately  40% 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-17
Certificates and consequently  does not  purport to  reflect the  return on  any
investment  in  the Class  A-17 Certificates  when  such reinvestment  rates are
considered.
 
                                     S-100
<PAGE>
    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 Mortgage Loans initially included in the Trust Estate may
differ  from those  currently expected  to be included  in the  Trust Estate 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-17 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.
 
                        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  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
 
                                     S-101
<PAGE>
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 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
 
                                     S-102
<PAGE>
instruct  the Servicers,  to the  extent provided  in the  applicable Underlying
Servicing Agreement to commence or delay foreclosure proceedings with respect to
delinquent Mortgage Loans. Such commencement or delay at such holder's direction
will be taken by the Master Servicer only after such holder deposits a specified
amount of  cash  with the  Master  Servicer. Such  cash  will be  available  for
distribution  to Certificateholders if  Liquidation Proceeds are  less than they
otherwise may  have  been had  the  Servicers  acted pursuant  to  their  normal
servicing procedures.
 
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  Lower-Tier  REMIC will  be  distributed to  the  holder of  the  Class A-LR
Certificate. See "Description of  the Certificates --  Additional Rights of  the
Class  A-R  and  Class  A-LR Certificateholders"  herein  and  "The  Pooling and
Servicing  Agreement  --  Termination;  Purchase  of  Mortgage  Loans"  in   the
Prospectus.  The exercise of the  foregoing option will be  in the Seller's sole
discretion. Without limitation, the Seller may enter into agreements with  third
parties to (i) exercise such option at the direction of such third party or (ii)
forbear from the exercise of such option.
 
                        SERVICING OF THE MORTGAGE LOANS
 
    Norwest   Mortgage  will  service  approximately  91.92%  (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.
 
                                     S-103
<PAGE>
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................................................                  91.92%
HomeSide Lending.....................................................                   2.13
FBS Mortgage Corporation.............................................                   1.88
Countrywide Home Loans, Inc..........................................                   1.54
Barnett Mortgage Company.............................................                   1.16
National City Mortgage Company.......................................                   1.03
Bank of Hawaii.......................................................                   0.22
GMAC Mortgage Corporation of P.A.....................................                   0.08
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."
 
    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 1,481 of the Mortgage  Loans in the Trust Estate, representing
approximately 63.84%  of the  Cut-Off Date  Aggregate Principal  Balance of  the
Mortgage  Loans will be Norwest Frederick-Serviced Loans and 551 of the Mortgage
Loans in the Trust Estate, representing approximately 28.08% 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";
 
                                     S-104
<PAGE>
        (d)  all  amounts  representing  scheduled  payments  of  principal  and
    interest due  after  the Due  Date  occurring in  the  month in  which  such
    Distribution Date occurs;
 
        (e)  unless the  applicable Underlying Servicing  Agreement provides for
    daily remittances  of Unscheduled  Principal  Receipts, as  described  below
    under  "--  Anticipated  Changes in  Servicing,"  all  Unscheduled Principal
    Receipts  received  by  such  Servicer  after  the  applicable   Unscheduled
    Principal  Receipt Period with  respect thereto specified  in the applicable
    Underlying Servicing Agreement, and all related payments of interest on such
    amounts;
 
        (f) all  amounts  representing  certain expenses  reimbursable  to  such
    Servicer  and any other amounts permitted to be retained by such Servicer or
    withdrawn by such Servicer from  the Servicer Custodial Account pursuant  to
    the applicable Underlying Servicing Agreement;
 
        (g)  all amounts in the nature of late fees, assumption fees, prepayment
    fees and  similar  fees  which  such  Servicer  is  entitled  to  retain  as
    additional servicing compensation; and
 
        (h)  reinvestment  earnings  on  payments  received  in  respect  of the
    Mortgage Loans  or on  other  amounts on  deposit  in the  related  Servicer
    Custodial Account.
 
UNSCHEDULED PRINCIPAL RECEIPTS
 
    The   Pooling  and  Servicing  Agreement  specifies,  as  to  each  type  of
Unscheduled Principal  Receipt,  a  period  (as  to  each  type  of  Unscheduled
Principal  Receipt, the "Unscheduled Principal Receipt Period") during which all
Unscheduled Principal Receipts  of such type  received by the  Servicer will  be
distributed  to  Certificateholders  on  the  related  Distribution  Date.  Each
Unscheduled Principal Receipt  Period will either  be (i) the  one month  period
ending  on the last day  of the calendar month preceding  the month in which the
applicable Remittance Date occurs (such  period a "Prior Month Receipt  Period")
or  (ii) the one month period ending on the day preceding the Determination Date
preceding the  applicable  Remittance Date  (such  period a  "Mid-Month  Receipt
Period").
 
    With  respect  to  the  Norwest  Frederick-Serviced  Loans,  the Unscheduled
Principal Receipt  Period with  respect to  all types  of Unscheduled  Principal
Receipts   is  a  Mid-Month   Receipt  Period.  With   respect  to  the  Norwest
Non-Frederick-Serviced Loans and Mortgage Loans serviced by Other Servicers, the
Unscheduled Principal Receipt Period  with respect to  all types of  Unscheduled
Principal Receipts is a Prior Month Receipt Period.
 
ANTICIPATED CHANGES IN SERVICING
 
    CHANGES  IN TIMING OF REMITTANCES OF  UNSCHEDULED PRINCIPAL RECEIPTS IN FULL
AND ELIMINATION OF MONTH END INTEREST.  The Pooling and Servicing Agreement will
provide that the Master Servicer  may (but is not  required), from time to  time
and  without  the consent  of any  Certificateholder, the  Trustee or  the Trust
Administrator, require Norwest Mortgage as Servicer under the related Underlying
Servicing Agreement to, or enter into an amendment to any applicable  Underlying
Servicing  Agreement  to  require  any  Other  Servicer  to,  remit  Unscheduled
Principal Receipts  in  full  to  the  Master  Servicer  for  deposit  into  the
Certificate  Account daily on a specified business day following receipt thereof
which will  generally  result  in  a  deposit  earlier  than  on  the  following
Remittance  Date. In conjunction  with any such  change, the applicable Servicer
would be relieved  of its  obligation to remit  Month End  Interest and  certain
other  conforming changes may be made. Such  changes would have an effect on the
amount  of  Compensating  Interest  as   described  herein  under  the   heading
"Description  of  the  Certificates  --  Interest."  Further,  the  Pooling  and
Servicing Agreement  will provide  that  the Master  Servicer  may (but  is  not
required  to), without the consent of  any Certificateholder, the Trustee or the
Trust Administrator, require Norwest Mortgage or any successor thereto under the
applicable Underlying Servicing Agreement to make remittances to the Certificate
Account (other than any remittances which are required to be made daily) on  the
18th  day of  each month,  or if  such 18th day  is not  a business  day, on the
preceding business day. No assurance can be  given as to the timing of any  such
changes or that any such changes will occur.
 
                                     S-105
<PAGE>
    CHANGES  IN UNSCHEDULED PRINCIPAL RECEIPT PERIOD.  The Pooling and Servicing
Agreement will provide that  the Master Servicer may  (but is not required  to),
from  time to time and without the consent of any Certificateholder, the Trustee
or the Trust Administrator,  (i) direct Norwest Mortgage  as Servicer under  the
related  Underlying  Servicing  Agreement to  change  the  Unscheduled Principal
Receipt Period applicable to  any type of  Unscheduled Principal Receipt  within
the  parameters described in (i),  (ii) and (iii) below  or (ii) with respect to
any Other  Servicer,  enter  into  an amendment  to  any  applicable  Underlying
Servicing  Agreement  for  the  purpose of  changing  the  Unscheduled Principal
Receipt Period applicable to  any type of  Unscheduled Principal Receipt  within
the  parameters  described in  (iv) below  and  making any  necessary conforming
changes incident thereto. In connection therewith, (i) the Unscheduled Principal
Receipt Period for the Norwest  Non-Frederick-Serviced Loans may be changed  (to
achieve  consistency with the  Norwest Frederick-Serviced Loans)  to a Mid-Month
Receipt Period with respect to all types of Unscheduled Principal Receipts; (ii)
the Unscheduled Principal Receipt Period for the Norwest  Non-Frederick-Serviced
Loans  may be changed to achieve  an Unscheduled Principal Receipt Period regime
(the "Target Regime") under which the Unscheduled Principal Receipt Period  with
respect to partial Unscheduled Principal Receipts would be a Prior Month Receipt
Period  and the Unscheduled Principal Receipt Period with respect to Unscheduled
Principal Receipts  in full  would  be a  Mid-Month  Receipt Period;  (iii)  the
Unscheduled  Principal Receipt  Period for the  Norwest Frederick-Serviced Loans
may be changed to the Target Regime; and (iv) the Unscheduled Principal  Receipt
Periods for the Mortgage Loans serviced by Other Servicers may be changed to the
Target Regime.
 
    Because Unscheduled Principal Receipts will result in interest shortfalls to
the  extent that they are not distributed  to Certificateholders in the month in
which they  are received  by the  applicable Servicer,  changing the  applicable
Unscheduled  Principal Receipt Period from a Mid-Month Receipt 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 (as  defined in  the
Underlying  Servicing Agreements) of such  Mortgage Loan as of  the first day of
each month.  The Servicing  Fee Rate  for each  Mortgage Loan  will be  a  fixed
percentage  rate per  annum. The  Servicing Fee Rate  for each  Mortgage Loan is
0.25% per annum.  In addition  to the Servicing  Fees, late  payment fees,  loan
assumption  fees and prepayment fees with respect to the Mortgage Loans, and any
interest or other  income earned  on collections  with respect  to the  Mortgage
Loans  pending  remittance  to the  Certificate  Account,  will be  paid  to, or
retained by, the Servicers as additional servicing compensation.
 
    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
 
                                     S-106
<PAGE>
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  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.
 
                                     S-107
<PAGE>
    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-17 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-6, Class A-8, Class  A-9,
Class  A-10, Class A-11, Class A-14, Class A-15 and Class A-18 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-1,
Class A-2, Class A-3, Class A-4, Class A-12 and Class A-16 Certificates will  be
issued  at  a  premium  and  that  the Class  A-5,  Class  A-13  and  Class A-19
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  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
 
                                     S-108
<PAGE>
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.
 
                              ERISA CONSIDERATIONS
 
    Neither the Class  A-R Certificate  nor the  Class A-LR  Certificate may  be
purchased  by or  transferred to  any person which  is an  employee benefit plan
within the meaning of  Section 3(3) of the  Employee Retirement Income  Security
Act  of  1974, as  amended  ("ERISA"), and  which  is subject  to  the fiduciary
responsibility rules  of Sections  401-414 of  ERISA or  Code Section  4975  (an
"ERISA  Plan") or which is  a governmental plan, as  defined in Section 3(32) of
ERISA, subject to any federal, state or local law ("Similar Law") which is, to a
material extent,  similar to  the  foregoing provisions  of  ERISA or  the  Code
(collectively, with an ERISA Plan, a "Plan"), or any person utilizing the assets
of  such Plan. Accordingly, the following discussion does not purport to discuss
the considerations under ERISA, Code Section 4975 or Similar Law with respect to
the purchase, acquisition or resale of  the Class A-R or Class A-LR  Certificate
and  for  purposes of  the following  discussion all  references to  the Offered
Certificates are deemed to exclude the Class A-R and Class A-LR Certificates.
 
    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
 
                                     S-109
<PAGE>
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.
 
                                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.
 
                                     S-110
<PAGE>
                                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-16 and Class
A-19 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-111
<PAGE>
                                  UNDERWRITING
 
    Subject  to the terms and conditions  of the underwriting agreement dated as
of June  19, 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 approximate 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.           SALOMON BROTHERS INC
- -------------------------------------------------  ----------------  ----------------------  --------------------
<S>                                                <C>               <C>                     <C>
A-1..............................................   $   10,312,000      $     10,312,000       $     10,312,000
A-2..............................................        8,185,000             8,185,000              8,185,000
A-3..............................................        9,700,000             9,700,000              9,700,000
A-4..............................................        6,997,667             6,997,667              6,997,667
A-5..............................................       16,131,000            16,131,000             16,131,000
A-6..............................................        9,211,333             9,211,333              9,211,333
A-8..............................................        5,076,667             5,076,667              5,076,667
A-9..............................................        3,385,333             3,385,333              3,385,333
A-10.............................................        6,770,667             6,770,667              6,770,667
A-11.............................................        9,499,933             9,499,933              9,499,933
A-12.............................................        4,606,667             4,606,667              4,606,667
A-13.............................................       18,921,333            18,921,333             18,921,333
A-14.............................................        8,158,333             8,158,333              8,158,333
A-15.............................................        4,001,000             4,001,000              4,001,000
A-16.............................................        4,000,000                     0                      0
A-17.............................................          449,000                     0                      0
A-18.............................................        5,333,333             5,333,333              5,333,333
A-19.............................................       25,551,000                     0                      0
A-R..............................................              100                     0                      0
A-LR.............................................              100                     0                      0
    Total........................................   $  156,290,467      $    126,290,267       $    126,290,267
</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 propose  initially
to  offer the Offered Certificates (other than the Class A-16, Class A-17, Class
A-19, Class  A-R  and Class  A-LR  Certificates) to  the  public at  the  public
offering  prices set forth on the cover  page of this Prospectus Supplement, and
to certain securities  dealers at  such prices  less the  concessions set  forth
below.  The Underwriters  may allow,  and such  dealers may  reallow, to certain
brokers and dealers concessions  not in excess of  those set forth below.  After
the  initial public offering, the public offering prices and other selling terms
may be changed.
 
                                     S-112
<PAGE>
 
<TABLE>
<CAPTION>
                                                           SELLING CONCESSION (PERCENT
                                                            OF CERTIFICATE PRINCIPAL        REALLOWANCE (PERCENT OF
SUBCLASS OF OFFERED CERTIFICATES                                     AMOUNT)             CERTIFICATE PRINCIPAL AMOUNT)
- --------------------------------------------------------  -----------------------------  -----------------------------
<S>                                                       <C>                            <C>
A-1.....................................................               0.120%                         0.060%
A-2.....................................................               0.120%                         0.060%
A-3.....................................................               0.120%                         0.060%
A-4.....................................................               0.120%                         0.060%
A-5.....................................................               0.150%                         0.075%
A-6.....................................................               0.120%                         0.060%
A-8.....................................................               0.150%                         0.075%
A-9.....................................................               0.150%                         0.075%
A-10....................................................               0.150%                         0.075%
A-11....................................................               0.150%                         0.075%
A-12....................................................               0.120%                         0.060%
A-13....................................................               0.120%                         0.060%
A-14....................................................               0.120%                         0.060%
A-15....................................................               0.150%                         0.075%
A-18....................................................               0.150%                         0.075%
</TABLE>
 
    The  Class  A-16,  Class  A-17,  Class  A-19,  Class  A-R  and  Class   A-LR
Certificates  will be offered  by Lehman Brothers  and the Class  A-16 and Class
A-19 Certificates  will also  be offered  by the  Dealer from  time to  time  in
negotiated  transactions or otherwise at varying  prices to be determined at the
time of sale. Lehman Brothers, the Dealer and any dealers that participate  with
Lehman  Brothers in the distribution of the  Class A-16, Class A-17, Class A-19,
Class A-R or Class A-LR Certificates may  be deemed to be underwriters, and  any
discounts  or commissions received by them and any profit on the resale of Class
A-16, Class A-17, Class A-19, Class A-R  or Class A-LR 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 LLP, New York, New York.
 
                                    EXPERTS
 
    The consolidated balance  sheets 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.
 
                                    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
 
                                     S-113
<PAGE>
(other than the Class A-17 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-17
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-114
<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-71
Aggregate Current Bankruptcy Losses......................................................................  S-72
Aggregate Current Fraud Losses...........................................................................  S-71
Aggregate Current Special Hazard Losses..................................................................  S-71
Available Master Servicing Compensation..................................................................  S-40
Bankruptcy Loss..........................................................................................  S-46
Bankruptcy Loss Amount...................................................................................  S-72
Bear Stearns Exemption...................................................................................  S-110
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-44
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-22
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-9 Component......................................................................................  S-2
</TABLE>
 
                                     S-115
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Class A-9 A Component....................................................................................  S-2
Class A-9 B Component....................................................................................  S-2
Class A-10 Component.....................................................................................  S-2
Class A-10 A Component...................................................................................  S-2
Class A-10 B Component...................................................................................  S-2
Class A-18 Percentage....................................................................................  S-51
Class A-18 Prepayment Shift Percentage...................................................................  S-52
Class A-18 Priority Amount...............................................................................  S-51
Class A-18 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-31
Compensating Interest....................................................................................  S-20
Component Interest Accrual Amount........................................................................  S-37
Component Interest Shortfall Amount......................................................................  S-43
Component Principal Balance..............................................................................  S-39
Component Rate...........................................................................................  S-37
Cooperatives.............................................................................................  S-73
Co-op Shares.............................................................................................  S-73
Cross-Over Date..........................................................................................  S-69
Curtailment Interest Shortfalls..........................................................................  S-41
Cut-Off Date Aggregate Principal Balance.................................................................  S-73
Dealer...................................................................................................  Cover
Debt Service Reduction...................................................................................  S-46
Deceased Holders.........................................................................................  S-60
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-14
Enhancement Act..........................................................................................  S-31
ERISA....................................................................................................  S-31
ERISA Plan...............................................................................................  S-109
Excess Bankruptcy Losses.................................................................................  S-72
Excess Fraud Losses......................................................................................  S-71
Excess Special Hazard Losses.............................................................................  S-71
Exchange Act.............................................................................................  S-67
Exemption................................................................................................  S-110
Exemptions...............................................................................................  S-110
Financial Security.......................................................................................  S-3
Fitch....................................................................................................  S-9
Fixed Non-relocation PHMC Portfolio Loans................................................................  S-83
Fixed PHMC Portfolio Loans...............................................................................  S-83
Fraud Loss...............................................................................................  S-46
</TABLE>
 
                                     S-116
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Fraud Loss Amount........................................................................................  S-71
GEMICO...................................................................................................  S-16
Group I Certificates and Components......................................................................  S-2
Group I Percentage.......................................................................................  S-51
Group I Principal Distribution Amount....................................................................  S-48
Group II Certificates....................................................................................  S-2
Group II Percentage......................................................................................  S-51
Guaranteed Distributions.................................................................................  S-64
Holdings.................................................................................................  S-65
Individual Class A-16 Certificate........................................................................  S-60
Individual Class A-19 Certificate........................................................................  S-60
Lehman Brothers..........................................................................................  S-21
Lehman Brothers Exemption................................................................................  S-110
Liquidated Loan..........................................................................................  S-45
Liquidated Loan Loss.....................................................................................  S-45
Living Holder............................................................................................  S-60
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-41
Moody's..................................................................................................  S-27
Mortgage Loans...........................................................................................  S-2
Mortgaged Properties.....................................................................................  S-73
Mortgages................................................................................................  S-73
NASCOR...................................................................................................  Cover
Net Foreclosure Profits..................................................................................  S-63
Net Mortgage Interest Rate...............................................................................  S-40
Net Partial Liquidation Proceeds.........................................................................  S-35
NMI Portfolio Loans......................................................................................  S-83
Non-PO Fraction..........................................................................................  S-22
Non-PO Voting Interest...................................................................................  S-101
Non-Supported Interest Shortfalls........................................................................  S-20
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-64
Original Subordinated Principal Balance..................................................................  S-46
Other Servicers..........................................................................................  S-103
Partial Liquidation Proceeds.............................................................................  S-35
Pass-Through Rate........................................................................................  S-19
Percentage Interest......................................................................................  S-36
Periodic Advance.........................................................................................  S-63
PHMC.....................................................................................................  S-2
PHMC Acquisition.........................................................................................  S-15
PHMC Correspondent.......................................................................................  S-8
</TABLE>
 
                                     S-117
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
PHMC Portfolio Loans.....................................................................................  S-83
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
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-110
Realized Loss............................................................................................  S-45
Record Date..............................................................................................  S-34
Regular Certificates.....................................................................................  S-107
Relocation Mortgage Loans................................................................................  S-83
REMIC....................................................................................................  S-4
Remittance Date..........................................................................................  S-35
REO Property.............................................................................................  S-103
Reserve Fund.............................................................................................  S-3
Residual Certificate.....................................................................................  S-107
Rounding Account.........................................................................................  S-60
S&P......................................................................................................  S-9
Salomon Brothers Exemption...............................................................................  S-110
Scheduled Amount.........................................................................................  S-52
Scheduled Certificates...................................................................................  S-2
Scheduled Principal Amount...............................................................................  S-51
Scheduled Principal Balance..............................................................................  S-45
Securities Act...........................................................................................  S-110
Seller...................................................................................................  S-2
Senior Optimal Amount....................................................................................  S-44
Series 1996-1 Certificates...............................................................................  Cover
Servicer.................................................................................................  S-2
Servicer Custodial Account...............................................................................  S-104
Servicing Fee Rate.......................................................................................  S-106
Similar Law..............................................................................................  S-31
SPA......................................................................................................  S-92
Special Hazard Loss......................................................................................  S-45
Special Hazard Loss Amount...............................................................................  S-71
Subclass.................................................................................................  Cover
Subsidy Account..........................................................................................  S-74
Subsidy Loan.............................................................................................  S-74
Target Regime............................................................................................  S-105
Trust Administrator......................................................................................  S-9
Trust Estate.............................................................................................  S-2
</TABLE>
 
                                     S-118
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                         PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Trustee..................................................................................................  S-9
U.S. Person..............................................................................................  S-68
UGRIC....................................................................................................  S-16
Underlying Servicing Agreement...........................................................................  S-8
Underwriters.............................................................................................  Cover
Underwriting Agreement...................................................................................  S-112
Underwriting Standards...................................................................................  S-16
Unscheduled Principal Amount.............................................................................  S-51
Unscheduled Principal Receipt Period.....................................................................  S-105
Unscheduled Principal Receipts...........................................................................  S-34
Upper-Tier Certificates..................................................................................  S-107
Upper-Tier REMIC.........................................................................................  S-4
400% SPA Targeted Balance................................................................................  S-52
175% SPA Targeted Balance................................................................................  S-52
</TABLE>
 
                                     S-119
<PAGE>
                 (This page has been left blank intentionally.)
<PAGE>
                      NORWEST ASSET SECURITIES CORPORATION
                                   ("NASCOR")
 
                                     SELLER
 
                       MORTGAGE PASS-THROUGH CERTIFICATES
                              (ISSUABLE IN SERIES)
                             ---------------------
 
    Norwest  Asset Securities  Corporation (the  "Seller" or  "NASCOR") may sell
from time to time, under this Prospectus and applicable Prospectus  Supplements,
Mortgage  Pass-Through  Certificates  (the "Certificates"),  issuable  in series
(each, a  "Series") consisting  of one  or  more classes  (each, a  "Class")  of
Certificates.  Any  Class  of  Certificates  may be  divided  into  two  or more
subclasses (each, a "Subclass").
 
    The Certificates of a Series  will represent beneficial ownership  interests
in  a separate trust formed by the Seller.  The property of each such trust (for
each Series,  the  "Trust Estate")  will  be  comprised primarily  of  fixed  or
adjustable  interest  rate, conventional,  first  mortgage loans  (the "Mortgage
Loans"), secured by  one- to  four-family residential  properties. The  Mortgage
Loans  will  have  been  acquired  by the  Seller  from  its  affiliate, Norwest
Mortgage, Inc. ("Norwest Mortgage"), and  will have been underwritten either  to
Norwest  Mortgage's underwriting standards,  to the underwriting  standards of a
Pool Insurer (as defined herein) or to such other standards as are described  in
the applicable Prospectus Supplement. All of the Mortgage Loans will be serviced
by  Norwest Mortgage individually  or together with one  or more other servicers
(each, a  "Servicer"). Norwest  Bank Minnesota,  National Association  ("Norwest
Bank"),  an  affiliate of  Norwest Mortgage,  will act  as master  servicer with
respect to each Trust Estate (in such capacity, the "Master Servicer").
 
    Each Series of Certificates may include one or more Classes of  Certificates
(the "Subordinated Certificates") that are subordinate in right of distributions
or  otherwise to one  or more of the  other Classes of  such Series (the "Senior
Certificates"). If  specified  in  the  applicable  Prospectus  Supplement,  the
relative  interests of the Senior Certificates and the Subordinated Certificates
of a Series in the Trust Estate may  be subject to adjustment from time to  time
on  the basis of distributions received  in respect thereof and losses allocated
to the  Subordinated  Certificates.  If  and to  the  extent  specified  in  the
Prospectus  Supplement,  credit  support  may  be  provided  for  any  Series of
Certificates, or any  Classes or Subclasses  thereof, in the  form of a  limited
guarantee,  financial guaranty insurance policy,  surety bond, letter of credit,
mortgage pool insurance  policy, reserve  fund, cross-support or  other form  of
credit enhancement as described herein or therein.
 
    Except  for  the Seller's  limited  obligations in  connection  with certain
breaches  of  its  representations  and  warranties,  certain  undertakings  and
obligations  of  the  Master  Servicer  and  Norwest  Mortgage's  obligations as
Servicer, the Certificates  will not  represent obligations of  the Seller,  the
Master  Servicer or Norwest Mortgage, or any affiliate of the Seller, the Master
Servicer or Norwest Mortgage.
 
    If specified in the  applicable Prospectus Supplement,  an election will  be
made  to  treat the  Trust Estate  (or one  or more  segregated pools  of assets
therein) underlying  a  Series  of  Certificates  as  a  "real  estate  mortgage
investment  conduit" (a "REMIC")  for federal income  tax purposes. See "Certain
Federal Income Tax Consequences."
 
    There will have  been no public  market for the  Certificates of any  Series
prior to the offering thereof. No assurance can be given that such a market will
develop,   or   that  if   such  a   market  does   develop,  it   will  provide
Certificateholders with liquidity of investment or will continue for the life of
the Certificates.
                            ------------------------
 
THESE SECURITIES HAVE  NOT BEEN APPROVED  OR DISAPPROVED BY  THE SECURITIES  AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
   AND  EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON
      THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO
            THE                  CONTRARY IS A CRIMINAL OFFENSE.
                            ------------------------
 
    The Certificates may be sold from time to time through one or more different
methods, including through underwriting syndicates  led by one or more  managing
underwriters  or through  one or  more underwriters  acting alone.  See "Plan of
Distribution." Affiliates of the Seller may from  time to time act as agents  or
underwriters in connection with the sale of the Certificates.
 
    This  Prospectus may not be used  to consummate sales of Certificates unless
accompanied by  the  Prospectus Supplement  relating  to the  offering  of  such
Certificates.
                            ------------------------
 
                  THE DATE OF THIS PROSPECTUS IS JULY 16, 1996
<PAGE>
 
                                    REPORTS
 
    The  Master Servicer  will prepare,  and the  Trustee or  other Paying Agent
appointed  for  each  Series  by  the  Master  Servicer  will  forward  to   the
Certificateholders of each Series statements containing information with respect
to  principal and interest  payments and the related  Trust Estate, as described
herein  and  in  the  applicable  Prospectus  Supplement  for  such  Series.  No
information  contained in such reports will  have been examined or reported upon
by an independent public accountant. See "The Pooling and Servicing Agreement --
Reports to Certificateholders." In addition, each Servicer for each Series  will
furnish  to the Master Servicer (who will be required to furnish promptly to the
Trustee for  such  Series),  a  statement from  a  firm  of  independent  public
accountants  with respect  to the examination  of certain  documents and records
relating to a random sample of mortgage loans serviced by such Servicer pursuant
to the related Underlying Servicing  Agreement and/or other similar  agreements.
See  "Servicing of the Mortgage  Loans -- Evidence as  to Compliance." Copies of
the statements provided by the Master Servicer to the Trustee will be  furnished
to  Certificateholders of each Series upon  request addressed to the Trustee for
the applicable Series  or to  the Master  Servicer c/o  Norwest Bank  Minnesota,
National  Association, 11000 Broken Land Parkway, Columbia, Maryland 21044-3562,
Attention: Securities Administration Services Manager.
 
                             ADDITIONAL INFORMATION
 
    This Prospectus contains, and the  Prospectus Supplement for each Series  of
Certificates  will contain,  a summary  of the  material terms  of the documents
referred to herein and therein, but neither contains nor will contain all of the
information set forth in the Registration Statement of which this Prospectus  is
a  part.  For  further  information,  reference  is  made  to  such Registration
Statement and  the  exhibits  thereto  which  the  Seller  has  filed  with  the
Securities  and Exchange Commission (the  "Commission"), Washington, D.C., under
the Securities  Act  of 1933,  as  amended (the  "Securities  Act").  Statements
contained in this Prospectus and any Prospectus Supplement as to the contents of
any  contract or other document referred to are summaries and, in each instance,
reference is made  to the copy  of the contract  or other document  filed as  an
exhibit  to the Registration  Statement, each such  statement being qualified in
all respects by  such reference.  Copies of  the Registration  Statement may  be
obtained  from the Public Reference Section  of the Commission, Washington, D.C.
20549 upon payment of the prescribed charges, or may be examined free of  charge
at the Commission's offices, 450 Fifth Street N.W., Washington, D.C. 20549 or at
the  regional offices of the Commission located at Room 1400, 75 Park Place, New
York, New York 10007 and 14th Floor, 500 West Madison Street, Chicago,  Illinois
60661.  The Commission also maintains  a site on the  World Wide Web at "http://
www.sec.gov" at which users can view  and download copies of reports, proxy  and
information  statements and  other information filed  electronically through the
Electronic Data Gathering, Analysis and  Retrieval ("EDGAR") system. The  Seller
has  filed the Registration  Statement, including all  exhibits thereto, through
the EDGAR system  and therefore such  materials should be  available by  logging
onto  the  Commission's Web  site. The  Commission maintains  computer terminals
providing access to the EDGAR system at  each of the offices referred to  above.
Copies  of any  documents incorporated herein  by reference will  be provided to
each person  to whom  a Prospectus  is delivered  upon written  or oral  request
directed   to  Norwest  Asset  Securities   Corporation,  5325  Spectrum  Drive,
Frederick, Maryland 21701, telephone number (301) 846-8881.
 
                        ADDITIONAL DETAILED INFORMATION
 
    The  Seller  intends  to  offer  by  subscription  detailed  mortgage   loan
information in machine readable format updated on a monthly basis (the "Detailed
Information")  with  respect to  each  outstanding Series  of  Certificates. The
Detailed Information  will  reflect payments  made  on the  individual  mortgage
loans, including prepayments in full and in part made on such mortgage loans, as
well  as the liquidation of  any such mortgage loans,  and will identify various
characteristics of the mortgage loans.  Subscribers of the Detailed  Information
are  expected to include a number of major investment brokerage firms as well as
financial information  service  firms. Some  of  such firms,  including  certain
 
                                       2
<PAGE>
investment   brokerage  firms  as  well  as  Bloomberg  L.P.  through  the  "The
Bloomberg-Registered Trademark-" service and Merrill Lynch Mortgage Capital Inc.
through the "CMO  Passport -Registered Trademark-"  service, may, in  accordance
with  their  individual  business  practices and  fee  schedules,  if  any, make
portions of, or summaries of portions of, the Detailed Information available  to
their  customers  and subscribers.  The Seller,  the  Master Servicer  and their
respective affiliates have no  control over and take  no responsibility for  the
actions   of  such  firms   in  processing,  analyzing   or  disseminating  such
information. For  further information  regarding  the Detailed  Information  and
subscriptions thereto, please contact Norwest Asset Securities Corporation, 5325
Spectrum Drive, Frederick, Maryland 21701, telephone number (301) 846-8881.
 
               INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
 
    There  are incorporated herein by reference  all documents and reports filed
or caused to  be filed  by NASCOR  with respect to  a Trust  Estate pursuant  to
Section  13(a), 13(c), 14 or 15(d) of the Exchange Act, prior to the termination
of an offering of Certificates  evidencing interests therein. Upon request,  the
Master  Servicer will  provide or  cause to be  provided without  charge to each
person to whom this Prospectus is  delivered in connection with the offering  of
one  or more Classes of Certificates a list identifying all filings with respect
to a Trust Estate pursuant to Section 13(a), 13(c), 14 or 15(d) of the  Exchange
Act  since NASCOR's latest fiscal year covered by its annual report on Form 10-K
and a copy of any or all documents or reports incorporated herein by  reference,
in  each case to the extent  such documents or reports relate  to one or more of
such Classes of  such Certificates, other  than the exhibits  to such  documents
(unless  such  exhibits  are  specifically  incorporated  by  reference  in such
documents). Requests to the Master Servicer should be directed to: Norwest Asset
Securities  Corporation,  5325  Spectrum   Drive,  Frederick,  Maryland   21701,
telephone number (301) 846-8881.
 
                                       3
<PAGE>
                               TABLE OF CONTENTS
                                   PROSPECTUS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
Reports....................................................................................................          2
Additional Information.....................................................................................          2
Additional Detailed Information............................................................................          2
Incorporation of Certain Information by Reference..........................................................          3
Summary of Prospectus......................................................................................          8
  Title of Securities......................................................................................          8
  Seller...................................................................................................          8
  Servicers................................................................................................          8
  Master Servicer..........................................................................................          8
  The Trust Estates........................................................................................          8
  Description of the Certificates..........................................................................          9
  Distributions on the Certificates........................................................................          9
  Cut-Off Date.............................................................................................          9
  Distribution Dates.......................................................................................          9
  Record Dates.............................................................................................         10
  Credit Enhancement.......................................................................................         10
  Periodic Advances........................................................................................         10
  Forms of Certificates....................................................................................         11
  Optional Purchase of Defaulted Mortgage Loans............................................................         11
  Optional Purchase of All Mortgage Loans..................................................................         11
  ERISA Limitations........................................................................................         11
  Tax Status...............................................................................................         12
  Legal Investment.........................................................................................         12
  Rating...................................................................................................         12
Risk Factors...............................................................................................         13
  Limited Liquidity........................................................................................         13
  Limited Obligations......................................................................................         13
  Limitations, Reduction and Substitution of Credit Enhancement............................................         13
  Risks of the Mortgage Loans..............................................................................         14
  Yield and Prepayment Considerations......................................................................         14
  Book-Entry System for Certain Classes and Subclasses of Certificates.....................................         15
The Trust Estates..........................................................................................         15
  General..................................................................................................         15
  Mortgage Loans...........................................................................................         15
    Fixed Rate Loans.......................................................................................         16
    Adjustable Rate Loans..................................................................................         17
    Graduated Payment Loans................................................................................         17
    Subsidy Loans..........................................................................................         17
    Buy-Down Loans.........................................................................................         18
    Balloon Loans..........................................................................................         19
The Seller.................................................................................................         19
Norwest Mortgage...........................................................................................         19
Norwest Bank...............................................................................................         20
The Mortgage Loan Programs.................................................................................         20
  Mortgage Loan Production Sources.........................................................................         20
  Acquisition of Mortgage Loans from Correspondents........................................................         21
  Mortgage Loan Underwriting...............................................................................         21
    Norwest Mortgage Underwriting..........................................................................         21
</TABLE>
 
                                       4
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
    Pool Certification Underwriting........................................................................         25
  Representations and Warranties...........................................................................         27
Description of the Certificates............................................................................         30
  General..................................................................................................         30
  Definitive Form..........................................................................................         31
  Book-Entry Form..........................................................................................         32
  Distributions to Certificateholders......................................................................         33
    General................................................................................................         33
    Distributions of Interest..............................................................................         35
    Distributions of Principal.............................................................................         35
  Other Credit Enhancement.................................................................................         37
    Limited Guarantee......................................................................................         37
    Financial Guaranty Insurance Policy or Surety Bond.....................................................         37
    Letter of Credit.......................................................................................         37
    Pool Insurance Policies................................................................................         38
    Special Hazard Insurance Policies......................................................................         38
    Mortgagor Bankruptcy Bond..............................................................................         38
    Reserve Fund...........................................................................................         38
    Cross Support..........................................................................................         38
Prepayment and Yield Considerations........................................................................         39
  Pass-Through Rates.......................................................................................         39
  Scheduled Delays in Distributions........................................................................         39
  Effect of Principal Prepayments..........................................................................         39
  Weighted Average Life of Certificates....................................................................         40
Servicing of the Mortgage Loans............................................................................         41
  The Master Servicer......................................................................................         41
  The Servicers............................................................................................         42
  Payments on Mortgage Loans...............................................................................         43
  Periodic Advances and Limitations Thereon................................................................         46
  Collection and Other Servicing Procedures................................................................         47
  Enforcement of Due-on-Sale Clauses; Realization Upon Defaulted Mortgage Loans............................         47
  Insurance Policies.......................................................................................         49
  Fixed Retained Yield, Servicing Compensation and Payment of Expenses.....................................         50
  Evidence as to Compliance................................................................................         51
Certain Matters Regarding the Master Servicer..............................................................         52
The Pooling and Servicing Agreement........................................................................         53
  Assignment of Mortgage Loans to the Trustee..............................................................         53
  Optional Purchases.......................................................................................         54
  Reports to Certificateholders............................................................................         55
  List of Certificateholders...............................................................................         56
  Events of Default........................................................................................         56
  Rights Upon Event of Default.............................................................................         56
  Amendment................................................................................................         57
  Termination; Optional Purchase of Mortgage Loans.........................................................         58
  The Trustee..............................................................................................         58
Certain Legal Aspects of the Mortgage Loans................................................................         59
  General..................................................................................................         59
  Foreclosure..............................................................................................         59
  Foreclosure on Shares of Cooperatives....................................................................         60
  Rights of Redemption.....................................................................................         61
  Anti-Deficiency Legislation and Other Limitations on Lenders.............................................         61
</TABLE>
 
                                       5
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
  Soldiers' and Sailors' Civil Relief Act and Similar Laws.................................................         63
  Environmental Considerations.............................................................................         63
  "Due-on-Sale" Clauses....................................................................................         64
  Applicability of Usury Laws..............................................................................         65
  Enforceability of Certain Provisions.....................................................................         65
Certain Federal Income Tax Consequences....................................................................         66
  Federal Income Tax Consequences for REMIC Certificates...................................................         66
  General..................................................................................................         66
  Status of REMIC Certificates.............................................................................         67
  Qualification as a REMIC.................................................................................         67
  Taxation of Regular Certificates.........................................................................         69
    General................................................................................................         69
    Original Issue Discount................................................................................         69
    Acquisition Premium....................................................................................         72
    Variable Rate Regular Certificates.....................................................................         72
    Market Discount........................................................................................         73
    Premium................................................................................................         74
    Election to Treat All Interest Under the Constant Yield Method.........................................         74
    Treatment of Losses....................................................................................         75
    Sale or Exchange of Regular Certificates...............................................................         75
  Taxation of Residual Certificates........................................................................         76
    Taxation of REMIC Income...............................................................................         76
    Basis and Losses.......................................................................................         76
    Treatment of Certain Items of REMIC Income and Expense.................................................         78
    Original Issue Discount and Premium....................................................................         78
    Market Discount........................................................................................         78
    Premium................................................................................................         78
    Limitations on Offset or Exemption of REMIC Income.....................................................         79
    Tax-Related Restrictions on Transfer of Residual Certificates..........................................         80
    Disqualified Organizations.............................................................................         80
    Noneconomic Residual Interests.........................................................................         81
    Foreign Investors......................................................................................         81
    Sale or Exchange of a Residual Certificate.............................................................         82
    Mark to Market Regulations.............................................................................         82
  Taxes That May Be Imposed on the REMIC Pool..............................................................         83
    Prohibited Transactions................................................................................         83
    Contributions to the REMIC Pool After the Startup Day..................................................         83
    Net Income from Foreclosure Property...................................................................         83
  Liquidation of the REMIC Pool............................................................................         83
  Administrative Matters...................................................................................         83
  Limitations on Deduction of Certain Expenses.............................................................         84
  Taxation of Certain Foreign Investors....................................................................         84
    Regular Certificates...................................................................................         84
    Residual Certificates..................................................................................         85
  Backup Withholding.......................................................................................         85
  Reporting Requirements...................................................................................         85
</TABLE>
 
                                       6
<PAGE>
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
  Federal Income Tax Consequences for Certificates as to Which No REMIC Election is Made...................         86
    General................................................................................................         86
    Tax Status.............................................................................................         87
    Premium and Discount...................................................................................         87
    Premium................................................................................................         88
    Original Issue Discount................................................................................         88
    Market Discount........................................................................................         88
    Recharacterization of Servicing Fees...................................................................         88
    Sale or Exchange of Certificates.......................................................................         89
  Stripped Certificates....................................................................................         89
    General................................................................................................         89
    Status of Stripped Certificates........................................................................         91
    Taxation of Stripped Certificates......................................................................         91
    Original Issue Discount................................................................................         91
    Sale or Exchange of Stripped Certificates..............................................................         92
    Purchase of More Than One Class of Stripped Certificates...............................................         92
    Possible Alternative Characterizations.................................................................         92
  Reporting Requirements and Backup Withholding............................................................         92
  Taxation of Certain Foreign Investors....................................................................         93
ERISA Considerations.......................................................................................         93
  General..................................................................................................         93
  Certain Requirements Under ERISA.........................................................................         93
    General................................................................................................         93
    Parties in Interest/Disqualified Persons...............................................................         93
    Delegation of Fiduciary Duty...........................................................................         94
  Administrative Exemptions................................................................................         94
    Individual Administrative Exemptions...................................................................         94
    PTE 83-1...............................................................................................         96
  Exempt Plans.............................................................................................         96
  Unrelated Business Taxable Income -- Residual Certificates...............................................         97
Legal Investment...........................................................................................         97
Plan of Distribution.......................................................................................         98
Use of Proceeds............................................................................................         99
Legal Matters..............................................................................................         99
Rating.....................................................................................................        100
Index of Significant Definitions...........................................................................        101
</TABLE>
 
                                       7
<PAGE>
                             SUMMARY OF PROSPECTUS
 
    THE  FOLLOWING IS  QUALIFIED IN  ITS ENTIRETY  BY REFERENCE  TO THE DETAILED
INFORMATION APPEARING  ELSEWHERE IN  THIS PROSPECTUS,  AND BY  REFERENCE TO  THE
INFORMATION  WITH  RESPECT  TO  EACH SERIES  OF  CERTIFICATES  CONTAINED  IN THE
APPLICABLE  PROSPECTUS  SUPPLEMENT.  CERTAIN  CAPITALIZED  TERMS  USED  AND  NOT
OTHERWISE  DEFINED  HEREIN  SHALL  HAVE THE  MEANINGS  GIVEN  ELSEWHERE  IN THIS
PROSPECTUS.
 
<TABLE>
<CAPTION>
Title of Securities...............  Mortgage Pass-Through Certificates (Issuable in Series).
<S>                                 <C>
Seller............................  Norwest Asset Securities  Corporation (the "Seller"),  a
                                    direct,  wholly-owned  subsidiary  of  Norwest Mortgage,
                                    Inc.  ("Norwest  Mortgage"),   which  is  an   indirect,
                                    wholly-owned subsidiary of Norwest Corporation ("Norwest
                                    Corporation"). See "The Seller."
Servicers.........................  Norwest  Mortgage and,  to the  extent specified  in the
                                    applicable Prospectus  Supplement,  one  or  more  other
                                    entities  identified therein  (each, a  "Servicer") will
                                    service the  Mortgage  Loans  contained  in  each  Trust
                                    Estate.  Each  Servicer will  perform  certain servicing
                                    functions with respect to the Mortgage Loans serviced by
                                    it pursuant to a  related Servicing Agreement (each,  an
                                    "Underlying Servicing Agreement"). See "Servicing of the
                                    Mortgage Loans."
Master Servicer...................  Norwest  Bank Minnesota,  National Association ("Norwest
                                    Bank" and,  in such  capacity, the  "Master  Servicer").
                                    Norwest  Bank  is a  direct, wholly-owned  subsidiary of
                                    Norwest Corporation and an affiliate of the Seller.  The
                                    Master  Servicer  will  perform  certain administration,
                                    calculation and reporting functions with respect to each
                                    Trust Estate and will  supervise the Servicers, in  each
                                    case,  pursuant to a Pooling and Servicing Agreement. In
                                    addition, the Master Servicer will generally be required
                                    to make  Periodic  Advances  (to  the  extent  described
                                    herein) with respect to the Mortgage Loans in each Trust
                                    Estate  to the  extent that the  related Servicer (other
                                    than Norwest Mortgage) fails to make a required Periodic
                                    Advance. See  "Servicing of  the Mortgage  Loans --  The
                                    Master   Servicer"   and  "--   Periodic   Advances  and
                                    Limitations Thereon."
The Trust Estates.................  Each Trust  Estate will  be formed  and each  Series  of
                                    Certificates  will be  issued pursuant to  a pooling and
                                    servicing agreement  (each,  a  "Pooling  and  Servicing
                                    Agreement")  among the  Seller, the  Master Servicer and
                                    the  Trustee  specified  in  the  applicable  Prospectus
                                    Supplement.  Each  Trust  Estate  will  consist  of  the
                                    related Mortgage Loans  (other than  the Fixed  Retained
                                    Yield  (as defined  herein), if  any) and  certain other
                                    related  property,  as   specified  in  the   applicable
                                    Prospectus   Supplement.  The  Mortgage  Loans  will  be
                                    conventional,  fixed   or  adjustable   interest   rate,
                                    mortgage  loans  secured  by  first  liens  on  one-  to
                                    four-family residential properties.
                                    The Mortgage Loans will have been acquired by the Seller
                                    from its affiliate Norwest Mortgage. The Mortgage  Loans
                                    will  have  been originated  by  Norwest Mortgage  or an
                                    affiliate or will have been acquired by Norwest Mortgage
                                    directly  or   indirectly  from   other  mortgage   loan
                                    originators.  All of  the Mortgage Loans  will have been
                                    underwritten either to Norwest
</TABLE>
 
                                       8
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    Mortgage's standards,  to the  extent specified  in  the
                                    applicable  Prospectus Supplement, to the standards of a
                                    Pool Insurer or to standards otherwise specified in  the
                                    Prospectus  Supplement. See "The Trust Estates" and "The
                                    Mortgage Loan Programs -- Mortgage Loan Underwriting."
                                    The particular characteristics or expected
                                    characteristics of the Mortgage Loans and a  description
                                    of  the  other property,  if  any, included  in  a Trust
                                    Estate will be  set forth in  the applicable  Prospectus
                                    Supplement.
Description of the Certificates...  Each  Series of  Certificates will  include one  or more
                                    Classes,  any   of  which   may  consist   of   multiple
                                    Subclasses.  A Class or Subclass of Certificates will be
                                    entitled, to the  extent of funds  available, to  either
                                    (i)  principal and  interest payments in  respect of the
                                    related Mortgage  Loans, (ii)  principal  distributions,
                                    with   no   interest   distributions,   (iii)   interest
                                    distributions, with no  principal distributions or  (iv)
                                    such   other  distributions  as  are  described  in  the
                                    applicable Prospectus Supplement.
Distributions on the
Certificates......................  INTEREST. With respect to  each Series of  Certificates,
                                    interest  on the related Mortgage  Loans at the weighted
                                    average  of  the  applicable  Mortgage  Interest   Rates
                                    thereof (net of servicing fees and certain other amounts
                                    as  described  herein  or in  the  applicable Prospectus
                                    Supplement), will be  passed through to  holders of  the
                                    related  Classes  of Certificates  in the  aggregate, in
                                    accordance with the particular terms of each such  Class
                                    of Certificates. See "Description of the Certificates --
                                    Distributions  to Certificateholders -- Distributions of
                                    Interest" herein. Except as  otherwise specified in  the
                                    applicable Prospectus Supplement, interest on each Class
                                    and  Subclass of Certificates of each Series will accrue
                                    at the  pass-through rate  for each  Class and  Subclass
                                    indicated in the applicable Prospectus Supplement (each,
                                    a  "Pass-Through  Rate")  on  the  outstanding principal
                                    balance or notional amount thereof.
                                    PRINCIPAL. With  respect to  a Series  of  Certificates,
                                    principal   payments  (including  prepayments)  will  be
                                    passed through to holders of the related Certificates or
                                    otherwise applied in accordance with the related Pooling
                                    and  Servicing  Agreement  on  each  Distribution  Date.
                                    Distributions  in reduction of principal balance will be
                                    allocated  among   the   Classes   and   Subclasses   of
                                    Certificates  of a Series in the manner specified in the
                                    applicable Prospectus  Supplement. See  "Description  of
                                    the  Certificates -- Distributions to Certificateholders
                                    -- Distributions of Principal."
Cut-Off Date......................  The  date   specified  in   the  applicable   Prospectus
                                    Supplement.
Distribution Dates................  Distributions on the Certificates will generally be made
                                    on  the 25th day (or, if such day is not a business day,
                                    the business day following the 25th day) of each  month,
                                    commencing  with the month following  the month in which
                                    the   applicable   Cut-Off   Date   occurs   (each,    a
                                    "Distribution  Date"). If so specified in the applicable
                                    Prospectus Supplement, distributions on
</TABLE>
 
                                       9
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    Certificates may  be made  on a  different day  of  each
                                    month or may be made quarterly, or semi-annually, on the
                                    dates specified in such Prospectus Supplement.
Record Dates......................  Distributions  will be made on each Distribution Date to
                                    Certificateholders of record at the close of business on
                                    (unless a different date is specified in the  applicable
                                    Prospectus  Supplement)  the  last business  day  of the
                                    month preceding  the month  in which  such  Distribution
                                    Date occurs (each, a "Record Date").
Credit Enhancement................  A Series of Certificates may include one or more Classes
                                    of  Senior  Certificates  and  one  or  more  Classes of
                                    Subordinated Certificates. The rights of the holders  of
                                    Subordinated   Certificates  of  a   Series  to  receive
                                    distributions with respect to the related Mortgage Loans
                                    will be subordinated  to such rights  of the holders  of
                                    the Senior Certificates of the same Series to the extent
                                    and  in the manner specified  in the applicable Prospec-
                                    tus  Supplement.  This  subordination  is  intended   to
                                    enhance  the  likelihood of  the  timely receipt  by the
                                    Senior Certificateholders of  their proportionate  share
                                    of  scheduled monthly principal and interest payments on
                                    the related Mortgage Loans  and to protect them  against
                                    losses.  This  protection will  be  effected by  (i) the
                                    preferential right of  the Senior Certificateholders  to
                                    receive, prior to any distribution being made in respect
                                    of  the related  Subordinated Certificates  on each Dis-
                                    tribution Date,  current  distributions on  the  related
                                    Mortgage  Loans of  principal and  interest due  them on
                                    each Distribution Date  out of the  funds available  for
                                    distributions  on such date,  (ii) by the  right of such
                                    holders to receive future distributions on the  Mortgage
                                    Loans  that  would otherwise  have  been payable  to the
                                    holders of Subordinated Certificates and/or (iii) by the
                                    prior allocation to the Subordinated Certificate of  all
                                    or  a  portion  of  losses  realized  on  the underlying
                                    Mortgage Loans.
                                    If so specified in the applicable Prospectus Supplement,
                                    the Certificates  of  any Series,  or  any one  or  more
                                    Classes  thereof, may be  entitled to the  benefits of a
                                    limited guarantee, financial guaranty insurance  policy,
                                    surety  bond, letter of  credit, mortgage pool insurance
                                    policy, reserve  fund, cross-support  or other  form  of
                                    credit   enhancement  as  specified  in  the  applicable
                                    Prospectus Supplement. See "Description of the  Certifi-
                                    cates -- Other Credit Enhancement."
Periodic Advances.................  In  the  event  of  delinquencies  in  payments  on  any
                                    Mortgage Loan, the Servicer servicing such Mortgage Loan
                                    will be obligated  to make advances  of cash  ("Periodic
                                    Advances") to the Servicer Custodial Account (as defined
                                    herein) to the extent that such Servicer determines such
                                    Periodic  Advances  would  be  recoverable  from  future
                                    payments and collections on such Mortgage Loan. Any such
                                    Periodic Advances will be reimbursable to such  Servicer
                                    as  described  herein and  in the  applicable Prospectus
                                    Supplement.  The  Master   Servicer  or  Trustee   will,
</TABLE>
 
                                       10
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    in  certain circumstances, be  required to make Periodic
                                    Advances upon a Servicer default. See "Servicing of  the
                                    Mortgage  Loans  --  Periodic  Advances  and Limitations
                                    Thereon."
Forms of Certificates.............  The Certificates will be issued either (i) in book-entry
                                    form ("Book-Entry Certificates") through the  facilities
                                    of The Depository Trust Company ("DTC") or (ii) in fully
                                    registered, certificated form ("Definitive
                                    Certificates").
                                    An  investor  in  a  Class  or  Subclass  of  Book-Entry
                                    Certificates will  not  receive a  physical  certificate
                                    representing  its ownership interest  in such Book-Entry
                                    Certificates, except  under extraordinary  circumstances
                                    which  are discussed in "Description of the Certificates
                                    -- Definitive  Form" in  this Prospectus.  Instead,  DTC
                                    will  effect  payments  and transfers  by  means  of its
                                    electronic  recordkeeping   services,   acting   through
                                    certain  participating organizations. This may result in
                                    certain  delays  in  receipt  of  distributions  by   an
                                    investor  and  may  restrict  an  investor's  ability to
                                    pledge its securities.  The rights of  investors in  the
                                    Book-Entry  Certificates may generally only be exercised
                                    through DTC  and  its participating  organizations.  See
                                    "Description  of the Certificates -- Book-Entry Form" in
                                    this Prospectus.
Optional Purchase of Defaulted
Mortgage Loans....................  The Seller or the Master  Servicer, may, subject to  the
                                    terms of the applicable Pooling and Servicing Agreement,
                                    purchase  any  defaulted Mortgage  Loan or  any Mortgage
                                    Loan as to which default is reasonably foreseeable  from
                                    the  related  Trust Estate.  See "Pooling  and Servicing
                                    Agreement -- Optional Purchases."
Optional Purchase of All Mortgage
Loans.............................  If  so  specified  in  the  Prospectus  Supplement  with
                                    respect  to a Series, all, but not less than all, of the
                                    Mortgage Loans  in  the  related Trust  Estate  and  any
                                    property acquired in respect thereof at the time, may be
                                    purchased  by the Seller, Norwest Mortgage or such other
                                    party as  is  specified  in  the  applicable  Prospectus
                                    Supplement,  in the manner and at the price specified in
                                    such  Prospectus  Supplement.  In  the  event  that   an
                                    election  is made to treat  the related Trust Estate (or
                                    one or more  segregated pools  of assets  therein) as  a
                                    REMIC,  any such purchase will be effected only pursuant
                                    to a "qualified liquidation,"  as defined under  Section
                                    860F(a)(4)(A)  of the Internal Revenue  Code of 1986, as
                                    amended (the "Code"). Exercise of the right of  purchase
                                    will  effect the early retirement of the Certificates of
                                    that Series. See "Prepayment and Yield Considerations."
ERISA Limitations.................  A fiduciary of any employee benefit plan subject to  the
                                    fiduciary  responsibility  provisions  of  the  Employee
                                    Retirement Income  Security  Act  of  1974,  as  amended
                                    ("ERISA"),  including the "prohibited transaction" rules
                                    thereunder, and to the  corresponding provisions of  the
                                    Code,   should  carefully  review  with  its  own  legal
                                    advisors   whether   the   purchase   or   holding    of
</TABLE>
 
                                       11
<PAGE>
 
<TABLE>
<S>                                 <C>
                                    Certificates could give rise to a transaction prohibited
                                    or  otherwise impermissible under ERISA or the Code. See
                                    "ERISA Considerations."
Tax Status........................  The treatment of the Certificates for federal income tax
                                    purposes will be determined by whether a REMIC  election
                                    is made with respect to a Series of Certificates and, if
                                    a  REMIC election  is made, by  whether the Certificates
                                    are  Regular  Interests   or  Residual  Interests.   See
                                    "Certain Federal Income Tax Consequences."
Legal Investment..................  The   applicable  Prospectus   Supplement  will  specify
                                    whether the  Class or  Classes of  Certificates  offered
                                    will   constitute  "mortgage   related  securities"  for
                                    purposes of  the Secondary  Mortgage Market  Enhancement
                                    Act  of  1984. Investors  whose investment  authority is
                                    subject to legal restrictions  should consult their  own
                                    legal  advisors to determine whether  and to what extent
                                    such Certificates constitute legal investments for them.
                                    See "Legal  Investment"  herein and  in  the  applicable
                                    Prospectus Supplement.
Rating............................  It is a condition to the issuance of the Certificates of
                                    any  Series offered  pursuant to  this Prospectus  and a
                                    Prospectus Supplement  that each  Class or  Subclass  be
                                    rated in one of the four highest rating categories by at
                                    least   one  nationally  recognized  statistical  rating
                                    organization (a "Rating Agency").  A security rating  is
                                    not   a  recommendation   to  buy,  sell   or  hold  the
                                    Certificates of any Series and is subject to revision or
                                    withdrawal at any time  by the assigning rating  agency.
                                    Further,  such  ratings  do not  address  the  effect of
                                    prepayments on the yield anticipated by an investor.
</TABLE>
 
                                       12
<PAGE>
                                  RISK FACTORS
 
    INVESTORS  SHOULD  CONSIDER, AMONG  OTHER THINGS,  THE FOLLOWING  FACTORS IN
CONNECTION WITH THE PURCHASE OF CERTIFICATES.
 
LIMITED LIQUIDITY
 
    There can be no  assurance that a secondary  market for the Certificates  of
any  Series  will  develop  or,  if  it  does  develop,  that  it  will  provide
Certificateholders with liquidity of investment or that it will continue for the
life of the Certificates of any Series. The Prospectus Supplement for any Series
of Certificates may indicate  that an underwriter  specified therein intends  to
establish  a secondary market in such  Certificates, however no underwriter will
be obligated to do so. Unless specified in the applicable Prospectus Supplement,
the Certificates will not be listed on any securities exchange.
 
LIMITED OBLIGATIONS
 
    Except for any  related insurance policies  and any reserve  fund or  credit
enhancement  described in  the applicable Prospectus  Supplement, Mortgage Loans
included in the related Trust Estate will be the sole source of payments on  the
Certificates  of a Series. The Certificates of  any Series will not represent an
interest in or obligation of NASCOR, Norwest Mortgage, Norwest Bank, the Trustee
or any of their affiliates, except for NASCOR's limited obligations with respect
to certain breaches  of its representations  and warranties, Norwest  Mortgage's
obligations  as  Servicer and  Norwest  Bank's obligations  as  Master Servicer.
Neither the Certificates of  any Series nor the  related Mortgage Loans will  be
guaranteed  or insured  by any  governmental agency  or instrumentality, NASCOR,
Norwest Mortgage, Norwest  Bank, the  Trustee, any  of their  affiliates or  any
other person. Consequently, in the event that payments on the Mortgage Loans are
insufficient  or  otherwise unavailable  to make  all  payments required  on the
Certificates, there will  be no  recourse to NASCOR,  Norwest Mortgage,  Norwest
Bank,  the  Trustee  or,  except  as  specified  in  the  applicable  Prospectus
Supplement, any other entity.
 
LIMITATIONS, REDUCTION AND SUBSTITUTION OF CREDIT ENHANCEMENT
 
    With respect  to each  Series  of Certificates,  credit enhancement  may  be
provided  in limited amounts to cover certain  types of losses on the underlying
Mortgage Loans. Credit enhancement will be provided in one or more of the  forms
referred  to  herein,  including, but  not  limited to:  subordination  of other
Classes of Certificates  of the same  Series; a limited  guarantee; a  financial
guaranty  insurance policy; a surety bond; a  letter of credit; a pool insurance
policy; a  special  hazard insurance  policy;  a mortgagor  bankruptcy  bond;  a
reserve  fund; cross-support; and  any combination thereof.  See "Description of
the Certificates -- Other Credit Enhancement" herein. Regardless of the form  of
credit  enhancement provided, the  amount of coverage will  be limited in amount
and in most cases  will be subject  to periodic reduction  in accordance with  a
schedule or formula. Furthermore, such credit enhancements may provide only very
limited  coverage as to certain types of  losses, and may provide no coverage as
to certain other types of losses. All or a portion of the credit enhancement for
any Series of Certificates will generally be permitted to be reduced, terminated
or substituted  for, in  the sole  discretion of  the Master  Servicer, if  each
applicable Rating Agency indicates that the then current rating thereof will not
be  adversely  affected.  In the  event  losses  exceed the  amount  of coverage
provided by any credit enhancement or losses of a type not covered by any credit
enhancement occur,  such losses  will be  borne by  the holders  of the  related
Certificates  (or  certain  Classes  thereof).  The  rating  of  any  Series  of
Certificates by  any  applicable Rating  Agency  may be  lowered  following  the
initial  issuance thereof as a  result of the downgrading  of the obligations of
any applicable credit support provider, or as a result of losses on the  related
Mortgage Loans in excess of the levels contemplated by such Rating Agency at the
time  of its initial rating analysis.  Neither NASCOR, Norwest Mortgage, Norwest
Bank, nor  any  of their  affiliates  will have  any  obligation to  replace  or
supplement  any credit enhancement, or to take  any other action to maintain any
rating of any  Class of Certificates.  See "Description of  the Certificates  --
Other Credit Enhancement."
 
                                       13
<PAGE>
RISKS OF THE MORTGAGE LOANS
 
    An  investment  in  securities  such as  the  Certificates,  which generally
represent interests in pools of residential mortgage loans, may be affected  by,
among  other  things,  a  decline  in real  estate  values  and  changes  in the
mortgagor's financial condition. No  assurance can be given  that the values  of
the  Mortgaged  Properties  (as  defined  herein)  securing  the  Mortgage Loans
underlying any Series  of Certificates  have remained  or will  remain at  their
levels  on  the dates  of  origination of  the  related Mortgage  Loans.  If the
residential real estate market should experience an overall decline in  property
values  such that the outstanding balances of  the Mortgage Loans contained in a
particular  Trust  Estate,  and  any   secondary  financing  on  the   Mortgaged
Properties,  become  equal  to  or  greater  than  the  value  of  the Mortgaged
Properties, the actual rates of delinquencies, foreclosures and losses could  be
higher than those now generally experienced in the mortgage lending industry and
those   experienced  in   Norwest  Mortgage's  or   other  Servicers'  servicing
portfolios. In addition to risk factors  related to the residential real  estate
market  generally, certain geographic regions of  the United States from time to
time will experience weaker regional economic conditions and housing markets  or
be  directly or indirectly  affected by natural  disasters or civil disturbances
such as earthquakes, hurricanes, floods,  eruptions or riots and,  consequently,
will  experience higher  rates of  loss and  delinquency than  on mortgage loans
generally. Although  Mortgaged Properties  located in  certain identified  flood
zones  will be required to be covered, to the maximum extent available, by flood
insurance, as  described under  "Servicing of  the Mortgage  Loans --  Insurance
Policies,"  no Mortgaged  Properties will  otherwise be  required to  be insured
against earthquake  damage of  any other  loss not  covered by  Standard  Hazard
Insurance  Policies,  as described  under "Servicing  of  the Mortgage  Loans --
Insurance  Policies."  Adverse  economic  conditions  generally,  in  particular
geographic  areas  or  industries,  or  affecting  particular  segments  of  the
borrowing community  (such  as  mortgagors  relying  on  commission  income  and
self-employed  mortgagors) and  other factors which  may or may  not affect real
property values (including the purposes for  which the Mortgage Loans were  made
and  the uses  of the  Mortgaged Properties)  may affect  the timely  payment by
mortgagors of scheduled payments of principal and interest on the Mortgage Loans
and, accordingly, the  actual rates  of delinquencies,  foreclosures and  losses
with  respect to any Trust Estate.  The Mortgage Loans underlying certain Series
of Certificates may be concentrated  in certain regions, and such  concentration
may  present  risk considerations  in addition  to  those generally  present for
similar mortgage-backed securities without such concentration. See "The Mortgage
Loan  Programs  --  Mortgage  Loan  Underwriting"  and  "Prepayment  and   Yield
Considerations  -- Weighted Average Life of  Certificates" herein. To the extent
that such losses are not covered  by the applicable credit enhancement,  holders
of  Certificates of the Series evidencing  interests in the related Trust Estate
will bear all risk of loss resulting from default by mortgagors and will have to
look primarily to  the value  of the Mortgaged  Properties for  recovery of  the
outstanding  principal and unpaid interest on  the defaulted Mortgage Loans. See
"The Trust  Estates  -- Mortgage  Loans"  and  "The Mortgage  Loan  Programs  --
Mortgage Loan Underwriting."
 
YIELD AND PREPAYMENT CONSIDERATIONS
 
    The yield of the Certificates of each Series will depend in part on the rate
of  principal payment on the Mortgage Loans (including prepayments, liquidations
due to defaults  and mortgage  loan repurchases).  Such yield  may be  adversely
affected,  depending upon  whether a  particular Certificate  is purchased  at a
premium or  discount  price, by  a  higher or  lower  than anticipated  rate  of
prepayments  on the related Mortgage Loans.  In particular, the yield on Classes
of Certificates  entitling  the  holders thereof  primarily  or  exclusively  to
payments  of interest or primarily or  exclusively to payments of principal will
be extremely sensitive to the rate of prepayments on the related Mortgage Loans.
In addition, the yield on certain Classes of Certificates may be relatively more
sensitive to  the rate  of prepayment  of specified  Mortgage Loans  than  other
Classes  of Certificates. In particular, prepayments  are influenced by a number
of factors,  including  prevailing mortgage  market  interest rates,  local  and
national  economic conditions and homeowner mobility.  In addition, the yield to
investors may be adversely affected by interest shortfalls which may result from
the timing of the receipt of prepayments or liquidations to the extent that such
interest shortfalls  are  not  covered  by aggregate  Servicing  Fees  or  other
mechanisms  specified  in the  applicable  Prospectus Supplement.  The  yield to
 
                                       14
<PAGE>
investors in Classes of  Certificates will be adversely  affected to the  extent
that  losses on the Mortgage Loans in  the related Trust Estate are allocated to
such Classes  and  may  be  adversely  affected  to  the  extent  of  unadvanced
delinquencies  on the  Mortgage Loans  in the  related Trust  Estate. Classes of
Certificates identified in the applicable Prospectus Supplement as  Subordinated
Certificates  are more  likely to be  affected by delinquencies  and losses than
other Classes of Certificates. See "Prepayment and Yield Considerations."
 
BOOK-ENTRY SYSTEM FOR CERTAIN CLASSES AND SUBCLASSES OF CERTIFICATES
 
    Since transactions in the Classes and Subclasses of Book-Entry  Certificates
of  any Series generally can be effected  only through DTC, DTC Participants and
Indirect  DTC  Participants,  the  ability  of  a  Beneficial  Owner  to  pledge
Book-Entry  Certificates to persons  or entities that do  not participate in the
DTC system, or to  otherwise act with respect  to such Book-Entry  Certificates,
may  be limited due  to the lack  of a physical  certificate for such Book-Entry
Certificates. In  addition, under  a book-entry  format, Beneficial  Owners  may
experience delays in their receipt of payments, since distributions will be made
by  the Master Servicer, or a Paying Agent  on behalf of the Master Servicer, to
Cede, as  nominee for  DTC. Also,  issuance of  the Book-Entry  Certificates  in
book-entry form may reduce the liquidity thereof in any secondary trading market
that  may  develop  therefor  because investors  may  be  unwilling  to purchase
securities for which they cannot  obtain delivery of physical certificates.  See
"Description of the Certificates -- Book-Entry Form" herein.
 
                               THE TRUST ESTATES
 
GENERAL
 
    The  Trust Estate for each Series  of Certificates will consist primarily of
Mortgage Loans evidenced by promissory  notes (the "Mortgage Notes") secured  by
mortgages,  deeds  of  trust  or other  instruments  creating  first  liens (the
"Mortgages") on  some or  all of  the following  six types  of property  (as  so
secured,  the "Mortgaged Properties"), to the extent set forth in the applicable
Prospectus  Supplement:  (i)  one-  to  four-family  detached  residences,  (ii)
townhouses,   (iii)   condominium  units,   (iv)   units  within   planned  unit
developments, (v) long-term  leases with respect  to any of  the foregoing,  and
(vi)  shares issued by private  non-profit housing corporations ("cooperatives")
and the related  proprietary leases or  occupancy agreements granting  exclusive
rights to occupy specified units in such cooperatives' buildings. In addition, a
Trust Estate will also include (i) amounts held from time to time in the related
Certificate  Account,  (ii)  the  Seller's  interest  in  any  primary  mortgage
insurance,  hazard  insurance,  title  insurance  or  other  insurance  policies
relating  to  a Mortgage  Loan,  (iii) any  property  which initially  secured a
Mortgage Loan and which  has been acquired by  foreclosure or trustee's sale  or
deed  in lieu of foreclosure  or trustee's sale, (iv)  if applicable, and to the
extent set forth in  the applicable Prospectus Supplement,  any reserve fund  or
funds,  (v)  if  applicable, and  to  the  extent set  forth  in  the applicable
Prospectus Supplement, contractual obligations of any person to make payments in
respect of any form of credit enhancement or any interest subsidy agreement  and
(vi)  such  other  assets  as  may be  specified  in  the  applicable Prospectus
Supplement. The Trust  Estate will not  include the portion  of interest on  the
Mortgage  Loans  which  constitutes  the  Fixed  Retained  Yield,  if  any.  See
"Servicing of the Mortgage Loans -- Fixed Retained Yield, Servicing Compensation
and Payment of Expenses."
 
MORTGAGE LOANS
 
    The Mortgage Loans will have been acquired by the Seller from its affiliate,
Norwest Mortgage.  The  Mortgage Loans  will  have been  originated  by  Norwest
Mortgage or will have been acquired by Norwest Mortgage from other affiliated or
unaffiliated  mortgage  loan  originators.  Each Mortgage  Loan  will  have been
underwritten either to Norwest Mortgage's standards, to the extent specified  in
the  applicable Prospectus Supplement, to the standards  of a Pool Insurer or to
such other standards set forth in the applicable Prospectus Supplement. See "The
Mortgage Loan Programs --  Mortgage Loan Production Sources"  and " --  Mortgage
Loan Underwriting." The Prospectus Supplement for each Series will set forth the
respective number and principal amounts of Mortgage Loans
 
                                       15
<PAGE>
(i)  originated  by Norwest  Mortgage  or its  affiliate  and (ii)  purchased by
Norwest Mortgage or its affiliates  from unaffiliated mortgage loan  originators
through Norwest Mortgage's mortgage loan purchase programs.
 
    Each  of the  Mortgage Loans will  be secured  by a Mortgage  on a Mortgaged
Property located in any of the 50 states or the District of Columbia. Generally,
the land underlying a Mortgaged Property will consist of five acres or less  but
may consist of greater acreage in Norwest Mortgage's discretion.
 
    If specified in the applicable Prospectus Supplement, the Mortgage Loans may
be  secured by leases on real property under circumstances that Norwest Mortgage
determines in its discretion are  commonly acceptable to institutional  mortgage
investors. A Mortgage Loan secured by a lease on real property is secured not by
a  fee simple  interest in the  Mortgaged Property  but rather by  a lease under
which the mortgagor has the right, for a specified term, to use the related real
estate and the residential dwelling located thereon. Generally, a Mortgage  Loan
will  be secured by a lease only if the use of leasehold estates as security for
mortgage loans is customary in the area,  the lease is not subject to any  prior
lien  that could result  in termination of the  lease and the  term of the lease
ends at least five years beyond the maturity date of the related Mortgage  Loan.
The  provisions of each lease securing a Mortgage Loan will expressly permit (i)
mortgaging of the  leasehold estate, (ii)  assignment of the  lease without  the
lessor's consent and (iii) acquisition by the holder of the Mortgage, in its own
or  its  nominee's  name,  of  the rights  of  the  lessee  upon  foreclosure or
assignment in lieu of foreclosure,  unless alternative arrangements provide  the
holder  of the  Mortgage with substantially  similar protections.  No lease will
contain provisions which (i) provide  for termination upon the lessee's  default
without  the holder of the Mortgage being entitled to receive written notice of,
and opportunity to cure, such default, (ii) provide for termination in the event
of damage  or destruction  as long  as the  Mortgage is  in existence  or  (iii)
prohibit  the  holder  of  the  Mortgage from  being  insured  under  the hazard
insurance policy or policies related to the premises.
 
    The Prospectus  Supplement will  set forth  the geographic  distribution  of
Mortgaged  Properties and the number and  aggregate unpaid principal balances of
the Mortgage Loans by category of Mortgaged Property. The Prospectus  Supplement
for  each Series will also set forth the  range of original terms to maturity of
the Mortgage Loans in the Trust  Estate, the weighted average remaining term  to
stated  maturity at the  Cut-Off Date of  such Mortgage Loans,  the earliest and
latest months  of origination  of such  Mortgage Loans,  the range  of  Mortgage
Interest Rates borne by such Mortgage Loans, if such Mortgage Loans have varying
Net  Mortgage Interest Rates, the weighted average Net Mortgage Interest Rate at
the Cut-Off Date of  such Mortgage Loans, the  range of Loan-to-Value Ratios  at
the  time  of origination  of such  Mortgage  Loans and  the range  of principal
balances at origination of such Mortgage Loans.
 
    The information with respect to the Mortgage Loans and Mortgaged  Properties
described  in the  preceding two paragraphs  may be presented  in the Prospectus
Supplement for a Series  as ranges in which  the actual characteristics of  such
Mortgage Loans and Mortgaged Properties are expected to fall. In all such cases,
information  as to the final characteristics of the Mortgage Loans and Mortgaged
Properties will be available in a Current Report on Form 8-K which will be filed
with the  Commission within  15 days  of  the initial  issuance of  the  related
Series.
 
    The  Mortgage Loans in  a Trust Estate will  generally have monthly payments
due on the first of each month (each, a "Due Date") but may, if so specified  in
the  applicable Prospectus Supplement,  have payments due on  a different day of
each month and will be of one of the following types of mortgage loans:
 
    A. FIXED  RATE  LOANS.    If  so  specified  in  the  applicable  Prospectus
Supplement,  a Trust  Estate may  contain fixed-rate,  fully-amortizing mortgage
loans providing for level monthly payments  of principal and interest and  terms
at  origination or modification of  not more than 30  years. If specified in the
applicable Prospectus Supplement, fixed rates  on certain Mortgage Loans may  be
converted  to adjustable rates after origination of such Mortgage Loans and upon
the satisfaction  of other  conditions specified  in the  applicable  Prospectus
Supplement. If so specified in the applicable Prospectus
 
                                       16
<PAGE>
Supplement,  the  Pooling and  Servicing Agreement  will  require the  Seller or
another party to repurchase each such  converted Mortgage Loan at the price  set
forth  in the applicable Prospectus Supplement.  A Trust Estate containing fixed
rate Mortgage Loans may contain convertible Mortgage Loans which have  converted
from  an adjustable interest rate prior to the formation of the Trust Estate and
which are subject to no further conversions.
 
    B. ADJUSTABLE RATE  LOANS.   If so  specified in  the applicable  Prospectus
Supplement, a Trust Estate may contain fully-amortizing adjustable-rate mortgage
loans  having an original or modified term to maturity of not more than 30 years
with a related Mortgage Interest  Rate which generally adjusts initially  either
six  months, one,  three, five,  seven or  ten years  subsequent to  the initial
payment date, and thereafter  at either six-month,  one-year or other  intervals
over  the term of the mortgage loan to equal the sum of a fixed margin set forth
in the related Mortgage Note and an index. The applicable Prospectus  Supplement
will  set forth the relevant index and  the highest, lowest and weighted average
margin with respect to the adjustable  rate mortgage loans in the related  Trust
Estate.  The applicable Prospectus Supplement will also indicate any periodic or
lifetime limitations on changes in  any per annum Mortgage  Rate at the time  of
any adjustment.
 
    If  specified in the  applicable Prospectus Supplement,  adjustable rates on
certain Mortgage Loans may be converted to fixed rates after origination of such
Mortgage Loans and  upon the  satisfaction of  the conditions  specified in  the
applicable  Prospectus  Supplement. If  specified  in the  applicable Prospectus
Supplement, the Seller or another party will generally be required to repurchase
each such  converted Mortgage  Loan at  the price  set forth  in the  applicable
Prospectus  Supplement. A Trust Estate containing adjustable rate Mortgage Loans
may contain  convertible  Mortgage  Loans  which have  converted  from  a  fixed
interest rate prior to the formation of the Trust Estate.
 
    If  so specified in  the applicable Prospectus  Supplement, the Trust Estate
may contain adjustable-rate  mortgage loans which  have Mortgage Interest  Rates
that  generally adjust monthly or may adjust  at other intervals as specified in
the applicable  Prospectus Supplement.  The scheduled  monthly payment  will  be
adjusted  as  and when  described in  the  applicable Prospectus  Supplement (at
intervals different from those at which the Mortgage Interest Rate is  adjusted)
to an amount that would fully amortize the Mortgage Loan over its remaining term
on  a level debt service basis; provided that increases in the scheduled monthly
payment may be  subject to certain  limitations as specified  in the  applicable
Prospectus  Supplement, thereby resulting in negative amortization of principal.
If an adjustment to the  Mortgage Interest Rate on  such a Mortgage Loan  causes
the  amount  of interest  accrued thereon  in  any month  to exceed  the current
scheduled monthly  payment  on  such  mortgage loan,  the  resulting  amount  of
interest  that has accrued but is not then payable ("Deferred Interest") will be
added to the principal balance of such Mortgage Loan.
 
    C. GRADUATED PAYMENT LOANS.   If so specified  in the applicable  Prospectus
Supplement,  a Trust Estate  may contain fixed-rate,  graduated payment mortgage
loans having original or modified  terms to maturity of  not more than 30  years
with  monthly  payments during  the first  year  calculated on  the basis  of an
assumed interest rate which is a specified percentage below the Mortgage Rate on
such mortgage  loan. Such  monthly payments  increase at  the beginning  of  the
second  year  by  a  specified  percentage of  the  monthly  payment  during the
preceding year and  each year specified  thereafter to the  extent necessary  to
amortize the mortgage loan over the remainder of its term. Deferred Interest, if
any, will be added to the principal balance of such mortgage loans.
 
    D.  SUBSIDY LOANS.  If so specified in the applicable Prospectus Supplement,
a Trust Estate may contain Mortgage Loans subject to temporary interest  subsidy
agreements  ("Subsidy Loans") pursuant to which the monthly payments made by the
related mortgagors will  be less  than the  scheduled monthly  payments on  such
Mortgage  Loans with  the present value  of the resulting  difference in payment
("Subsidy Payments") being provided by the employer of the mortgagor,  generally
on  an annual basis.  Subsidy Payments will  generally be placed  in a custodial
account ("Subsidy Account")
 
                                       17
<PAGE>
by the related Servicer. Despite the existence of a subsidy program, a mortgagor
remains primarily liable for making all scheduled payments on a Subsidy Loan and
for all other obligations provided for in the related Mortgage Note and Mortgage
Loan.
 
    Subsidy Loans are offered by employers generally through either a  graduated
or  fixed  subsidy loan  program, or  a  combination thereof.  The terms  of the
subsidy agreements relating  to Subsidy Loans  generally range from  one to  ten
years.  The subsidy agreements relating to  Subsidy Loans made under a graduated
program generally will  provide for  subsidy payments that  result in  effective
subsidized  interest rates between  three percentage points  and five percentage
points below  the Mortgage  Interest  Rates specified  in the  related  Mortgage
Notes.  Generally, under a graduated program, the subsidized rate for a Mortgage
Loan will increase approximately one percentage  point per year until it  equals
the full Mortgage Interest Rate. For example, if the initial subsidized interest
rate is five percentage points below the Mortgage Interest Rate in year one, the
subsidized  rate  will increase  to four  percentage  points below  the Mortgage
Interest Rate in year two, and likewise until year six, when the subsidized rate
will equal the Mortgage Interest Rate. Where the subsidy agreements relating  to
Subsidy  Loans are in effect for longer than five years, the subsidized interest
rates generally increase  at smaller  percentage increments for  each year.  The
subsidy  agreements  relating  to  Subsidy  Loans  made  under  a  fixed program
generally will  provide  for  subsidized interest  rates  at  fixed  percentages
(generally  one percentage  point to two  percentage points)  below the Mortgage
Interest Rates for  specified periods,  generally not  in excess  of ten  years.
Subsidy Loans are also offered pursuant to combination fixed/graduated programs.
The subsidy agreements relating to such Subsidy Loans generally will provide for
an  initial fixed  subsidy of  up to  five percentage  points below  the related
Mortgage Interest Rate for up  to five years, and  then a periodic reduction  in
the  subsidy for up to  five years, at an equal  fixed percentage per year until
the subsidized rate equals the Mortgage Interest Rate.
 
    Generally, employers may terminate subsidy programs in the event of (i)  the
mortgagor's  death, retirement,  resignation or termination  of employment, (ii)
the full prepayment  of the Subsidy  Loan by  the mortgagor, (iii)  the sale  or
transfer by the mortgagor of the related Mortgaged Property as a result of which
the  mortgagee  is  entitled to  accelerate  the  Subsidy Loan  pursuant  to the
"due-on-sale" clause  contained in  the Mortgage,  or (iv)  the commencement  of
foreclosure  proceedings or the acceptance of a  deed in lieu of foreclosure. In
addition, some  subsidy programs  provide  that if  prevailing market  rates  of
interest  on mortgage loans similar to a Subsidy Loan are less than the Mortgage
Interest Rate of such Subsidy Loan, the employer may request that the  mortgagor
refinance  such Subsidy Loan and may  terminate the related subsidy agreement if
the mortgagor fails to refinance such  Subsidy Loan. In the event the  mortgagor
refinances  such Subsidy Loan,  the new loan  will not be  included in the Trust
Estate. See "Prepayment and Yield Considerations" herein. In the event a subsidy
agreement is terminated,  the amount remaining  in the Subsidy  Account will  be
returned  to the employer, and the mortgagor  will be obligated to make the full
amount of  all remaining  scheduled payments,  if any.  The mortgagor's  reduced
monthly  housing expense as a consequence  of payments under a subsidy agreement
is used  by Norwest  Mortgage in  determining certain  expense-to-income  ratios
utilized  in underwriting  a Subsidy  Loan. See  "The Mortgage  Loan Programs --
Mortgage Loan Underwriting."
 
    E. BUY-DOWN LOANS.  If so specified in the applicable Prospectus Supplement,
a Trust Estate may  contain Mortgage Loans subject  to temporary buy-down  plans
("Buy-Down  Loans") pursuant to which the monthly payments made by the mortgagor
during the early  years of the  Mortgage Loan  will be less  than the  scheduled
monthly  payments on the Mortgage Loan. The resulting difference in payment will
be compensated  for from  an amount  contributed by  the seller  of the  related
Mortgaged  Property or another source, including  the originator of the Mortgage
Loan (generally on a present value basis) and, if so specified in the applicable
Prospectus Supplement, placed in  a custodial account  (the "Buy-Down Fund")  by
the  related Servicer. If the mortgagor on a Buy-Down Loan prepays such Mortgage
Loan in  its entirety,  or defaults  on  such Mortgage  Loan and  the  Mortgaged
Property is sold in liquidation thereof, during the period when the mortgagor is
not obligated, on account of the buy-
 
                                       18
<PAGE>
down  plan, to  pay the  full monthly  payment otherwise  due on  such loan, the
unpaid principal balance of  such Buy-Down Loan will  be reduced by the  amounts
remaining  in the  Buy-Down Fund  with respect to  such Buy-Down  Loan, and such
amounts will be deposited in the  Servicer Custodial Account or the  Certificate
Account,  net of  any amounts  paid with  respect to  such Buy-Down  Loan by any
insurer, guarantor or other person pursuant to a credit enhancement  arrangement
described in the applicable Prospectus Supplement.
 
    F.  BALLOON LOANS.  If so specified in the applicable Prospectus Supplement,
a Trust  Estate may  include Mortgage  Loans which  are amortized  over a  fixed
period  not exceeding 30  years but which  have shorter terms  to maturity (each
such Mortgage  Loan, a  "Balloon Loan")  that causes  the outstanding  principal
balance  of the  related Mortgage Loan  to be  due and payable  at the  end of a
certain specified period (the  "Balloon Period"). The  borrower of such  Balloon
Loan  will be obligated to  pay the entire outstanding  principal balance of the
Balloon Loan at  the end of  the related  Balloon Period. In  the event  Norwest
Mortgage  refinances a mortgagor's  Balloon Loan at maturity,  the new loan will
not be included in the Trust  Estate. See "Prepayment and Yield  Considerations"
herein.
 
    A  Trust  Estate may  also include  other types  of first  lien, residential
Mortgage Loans to the extent set forth in the applicable Prospectus Supplement.
 
                                   THE SELLER
 
    Norwest Asset Securities Corporation (the "Seller" or "NASCOR") is a direct,
wholly owned subsidiary of Norwest Mortgage, Inc. and an indirect, wholly  owned
subsidiary  of Norwest  Corporation, a corporation  organized under  the laws of
Delaware ("Norwest Corporation"). The  Seller was incorporated  in the State  of
Delaware on March 28, 1996.
 
    The limited purposes of the Seller are, in general, to acquire, own and sell
mortgage  loans; to  issue, acquire,  own, hold  and sell  mortgage pass-through
securities which represent  ownership interests in  mortgage loans,  collections
thereon  and related properties; and to engage  in any acts which are incidental
to, or necessary, suitable or convenient to accomplish, the foregoing.
 
    The Seller maintains its principal office at 5325 Spectrum Drive, Frederick,
Maryland 21701. Its telephone number is (301) 846-8881.
 
    At the time of  the formation of  any Trust Estate, the  Seller will be  the
sole  owner of all the related Mortgage Loans. The Seller will have acquired the
Mortgage Loans included in any Trust Estate from Norwest Mortgage. Except to the
extent otherwise specified in the applicable Prospectus Supplement, the Seller's
only obligation  with respect  to the  Certificates  of any  Series will  be  to
repurchase  or substitute for Mortgage  Loans in a Trust  Estate in the event of
defective documentation  or  upon  the breach  of  certain  representations  and
warranties  made  by the  Seller. See  "The Pooling  and Servicing  Agreement --
Assignment of Mortgage Loans to the Trustee."
 
                                NORWEST MORTGAGE
 
    Norwest Mortgage, Inc. ("Norwest Mortgage") was originally incorporated as a
Minnesota corporation on July 1, 1983. On August 30, 1995, Norwest Mortgage  and
Directors  Mortgage  Loan  Corporation, a  California  corporation,  completed a
statutory merger.  As  a result  of  the  merger, Norwest  became  a  California
corporation  as of September 1, 1995. Norwest Mortgage is engaged principally in
the business of (i) originating and purchasing residential mortgage loans in its
own name and through its affiliates,  Norwest Funding, Inc. and Norwest  Funding
II,  Inc.  (collectively,  "Norwest  Funding")  and  (ii)  servicing residential
mortgage loans  for  its own  account  or for  the  account of  others.  Norwest
Mortgage  is a  direct, wholly  owned subsidiary  of Norwest  Nova, Inc.  and an
indirect, wholly owned subsidiary of Norwest Corporation. The executive  offices
of  Norwest Mortgage are located  at 405 Southwest 5th  Street, Des Moines, Iowa
50309-4603, and its telephone number is (515) 221-7300.
 
    On May 7,  1996 Norwest  Mortgage and Norwest  Funding acquired  all of  the
mortgage  origination,  servicing  and  secondary  marketing  operations  of The
Prudential Home Mortgage Company, Inc.
 
                                       19
<PAGE>
("PHMC"), an  indirect,  wholly owned  subsidiary  of The  Prudential  Insurance
Company  of  America,  and purchased  certain  mortgage  loans from  PHMC  and a
substantial portion of  PHMC's mortgage servicing  portfolio (such  transaction,
the  "PHMC  Acquisition").  The  Mortgage Loans  included  in  any  Trust Estate
underlying a Series of Certificates may consist of (i) Mortgage Loans originated
by Norwest  Mortgage or  Norwest Funding  or purchased  by Norwest  Mortgage  or
Norwest  Funding from  originators other  than PHMC  ("Norwest Mortgage Loans"),
(ii) Mortgage Loans  originated or  purchased by  PHMC and  acquired by  Norwest
Mortgage  or Norwest Funding  from PHMC as  part of the  PHMC Acquisition ("PHMC
Mortgage Loans")  or (iii)  a combination  of Norwest  Mortgage Loans  and  PHMC
Mortgage Loans.
 
    Norwest  Mortgage is an approved servicer  of FNMA, FHLMC and the Government
National Mortgage Association. As of December  31, 1995, Norwest Mortgage had  a
net worth of approximately $314.8 million.
 
                                  NORWEST BANK
 
    Norwest  Bank Minnesota, National  Association ("Norwest Bank")  will act as
Master Servicer with respect  to each Series. Norwest  Bank is a direct,  wholly
owned  subsidiary of  Norwest Corporation.  Norwest Bank  is a  national banking
association originally  chartered in  1872 and  is engaged  in a  wide range  of
activities typical of a national bank.
 
    Norwest  Bank's principal  office is  located at  Norwest Center,  Sixth and
Marquette, Minneapolis,  Minnesota  55479.  Norwest  Bank  conducts  its  master
servicing  and securities  administration services  at its  offices in Columbia,
Maryland. Its address  there is  11000 Broken Land  Parkway, Columbia,  Maryland
21044-3662 and its telephone number is (410) 884-2000.
 
                           THE MORTGAGE LOAN PROGRAMS
 
MORTGAGE LOAN PRODUCTION SOURCES
 
    Norwest  Mortgage  conducts  a  significant  portion  of  its  mortgage loan
originations through more than 700  loan production offices (the "Loan  Stores")
located  throughout all 50 states. Norwest  Mortgage also conducts a significant
portion of its mortgage loan originations through centralized production offices
located  in  Springfield,   Illinois,  Frederick,   Maryland  and   Minneapolis,
Minnesota.  At the latter locations,  Norwest Mortgage receives applications for
home mortgage  loans on  toll-free telephone  numbers that  can be  called  from
anywhere in the United States.
 
    The  following  are  Norwest  Mortgage's primary  sources  of  mortgage loan
originations: (i) direct contact with prospective borrowers (including borrowers
with mortgage loans currently serviced by Norwest Mortgage or borrowers referred
by borrowers with mortgage loans  currently serviced by Norwest Mortgage),  (ii)
referrals by realtors, other real estate professionals and prospective borrowers
to  the  Loan  Stores, (iii)  referrals  from selected  corporate  clients, (iv)
referrals from  the  private  mortgage  banking group,  a  division  of  Norwest
Funding,  Inc.,  which specializes  in  mortgage loans  with  original principal
balances in excess of the limits of  FNMA and FHLMC, (v) several joint  ventures
into  which  Norwest  Mortgage,  through its  wholly  owned  subsidiary, Norwest
Mortgage Ventures, Inc., has entered with realtors and banking institutions (the
"Joint Ventures") and (vi) referrals from mortgage brokers and similar entities.
In addition to  its own  mortgage loan originations,  Norwest Mortgage  acquires
qualifying mortgage loans from other unaffiliated originators
("Correspondents").  See " -- Acquisition of Mortgage Loans from Correspondents"
below. The relative contribution of each of these sources to Norwest  Mortgage's
business,  measured by  the volume of  loans generated, tends  to fluctuate over
time.
 
    Norwest Mortgage Ventures, Inc. owns at least a 50% interest in each of  the
Joint  Ventures, with the remaining ownership interest  in each being owned by a
realtor or  a  banking institution  having  significant contact  with  potential
borrowers. Mortgage loans that are originated by Joint Ventures in which Norwest
Mortgage's  partners are realtors are generally  made to finance the acquisition
of
 
                                       20
<PAGE>
properties marketed by  such Joint Venture  partners. Applications for  mortgage
loans  originated through  Joint Ventures are  generally taken  by Joint Venture
employees and underwritten by Norwest  Mortgage in accordance with its  standard
underwriting criteria. Such mortgage loans are then closed by the Joint Ventures
in  their own  names and subsequently  purchased by Norwest  Mortgage or Norwest
Funding.
 
    Norwest Mortgage  may  directly  contact  prospective  borrowers  (including
borrowers  with mortgage loans  currently serviced by  Norwest Mortgage) through
general and targeted solicitations. Such  solicitations are made through  direct
mailings,  mortgage  loan  statement  inserts and  television,  radio  and print
advertisements and by telephone.  Norwest Mortgage's targeted solicitations  may
be  based on characteristics such as  the borrower's mortgage loan interest rate
or payment history and  the geographic location of  the mortgaged property.  See
"Prepayment and Yield Considerations" herein.
 
    A  majority  of  Norwest  Mortgage's corporate  clients  are  companies that
sponsor relocation programs  for their  employees and in  connection with  which
Norwest  Mortgage provides mortgage financing. Eligibility for a relocation loan
is based, in  general, on an  employer's providing financial  assistance to  the
relocating  employee in  connection with  a job-required  move. Although Subsidy
Loans are  typically generated  through such  corporate-sponsored programs,  the
assistance extended by the employer need not necessarily take the form of a loan
subsidy.  (Not all  relocation loans are  generated by  Norwest Mortgage through
referrals from its corporate clients; some  relocation loans are generated as  a
result  of referrals from  mortgage brokers and similar  entities and others are
generated through Norwest  Mortgage's acquisition of  mortgage loans from  other
originators.)  Also  among  Norwest  Mortgage's  corporate  clients  are various
professional associations. These  associations, as well  as the other  corporate
clients,  promote the availability of a broad range of Norwest Mortgage mortgage
products to their members or  employees, including refinance loans,  second-home
loans and investment-property loans.
 
ACQUISITION OF MORTGAGE LOANS FROM CORRESPONDENTS
 
    In  order to qualify  for participation in  Norwest Mortgage's mortgage loan
purchase programs, lending institutions must  (i) meet and maintain certain  net
worth  and other financial standards, (ii) demonstrate experience in originating
residential  mortgage  loans,  (iii)  meet  and  maintain  certain   operational
standards,  (iv) evaluate each loan offered  to Norwest Mortgage for consistency
with Norwest  Mortgage's underwriting  guidelines  or the  standards of  a  Pool
Insurer and represent that each loan was underwritten in accordance with Norwest
Mortgage  standards  or the  standards of  a  Pool Insurer  and (v)  utilize the
services of qualified appraisers.
 
    The contractual arrangements with Correspondents may involve the  commitment
by  Norwest Mortgage to accept  delivery of a certain  dollar amount of mortgage
loans over a period of time; this commitment may be satisfied either by delivery
of mortgage  loans  one  at  a  time  or  in  multiples  as  aggregated  by  the
Correspondent. The contractual arrangements with Correspondents may also involve
the  delegation of all underwriting functions to such Correspondents ("Delegated
Underwriting"), which  will  result  in  Norwest  Mortgage  not  performing  any
underwriting  functions prior to acquisition of  the loan but instead relying on
such originators' representations, and Norwest Mortgage's post-purchase  reviews
of  samplings of  mortgage loans  acquired from  such originators  regarding the
originators' compliance with Norwest  Mortgage's underwriting standards. In  all
instances,  however, acceptance by Norwest Mortgage is contingent upon the loans
being found to satisfy Norwest Mortgage's program standards or the standards  of
a  Pool Insurer. Norwest Mortgage may  also acquire portfolios of seasoned loans
in negotiated transactions.
 
MORTGAGE LOAN UNDERWRITING
 
    NORWEST MORTGAGE UNDERWRITING.   Norwest  Mortgage's underwriting  standards
are  applied by  or on  behalf of Norwest  Mortgage to  evaluate the applicant's
credit standing and ability to repay the loan, as well as the value and adequacy
of the mortgaged property as  collateral. The underwriting standards that  guide
the  determination represent a balancing of  several factors that may affect the
ultimate recovery of the loan amount, including, among others, the amount of the
loan, the ratio of the
 
                                       21
<PAGE>
loan amount to the property value (i.e., the lower of the appraised value of the
mortgaged property and the purchase price), the borrower's means of support  and
the  borrower's credit  history. Norwest Mortgage's  guidelines for underwriting
may vary according  to the nature  of the borrower  or the type  of loan,  since
differing  characteristics may  be perceived  as presenting  different levels of
risk. With respect to certain Mortgage Loans, the originators of such loans  may
have  contracted  with unaffiliated  third parties  to perform  the underwriting
process. Except as described  below, Mortgage Loans were  underwritten by or  on
behalf  of  Norwest Mortgage  or,  in the  case  of PHMC  Mortgage  Loans, PHMC,
generally in accordance with the standards and procedures described herein.
 
    Norwest Mortgage utilizes  various systems of  credit scoring as  a tool  to
supplement  the  mortgage  loan  underwriting  process.  Credit  scoring assists
Norwest Mortgage in the mortgage loan approval process by providing  consistent,
objective  measures  of  borrower  credit and  loan  attributes.  Such objective
measures are used to  evaluate loan applications and  assign each application  a
"Credit  Score." The Credit Score is used  to determine the type of underwriting
process  and  which  level  of  underwriter  will  review  the  loan  file.  For
transactions  which are determined  to be low-risk  transactions, based upon the
Credit Score  and  other  parameters (including  the  mortgage  loan  production
source),  the lowest underwriting authority  is generally required. For moderate
and higher risk transactions, higher level underwriters and a full review of the
mortgage file are generally required.  Borrowers who have a satisfactory  Credit
Score  (based upon the mortgage loan production source) are generally subject to
streamlined credit  review  (which relies  on  the credit  scoring  process  for
various  elements of the  underwriting assessments). Such  borrowers may also be
eligible for  a limited  documentation  program and  are generally  permitted  a
greater latitude in the application of borrower debt-to-income ratios.
 
    With respect to all mortgage loans underwritten by Norwest Mortgage, Norwest
Mortgage's  underwriting of  a mortgage  loan may be  based on  data obtained by
parties other than Norwest Mortgage that  are involved at various stages in  the
mortgage  origination  or  acquisition  process.  This  typically  occurs  under
circumstances in which loans are subject  to more than one approval process,  as
when correspondents, certain mortgage brokers or similar entities that have been
approved  by Norwest  Mortgage to  process loans  on its  behalf, or independent
contractors hired by Norwest  Mortgage to perform  underwriting services on  its
behalf   ("contract  underwriters")  make  initial   determinations  as  to  the
consistency  of  loans  with  Norwest  Mortgage  underwriting  guidelines.   The
underwriting  of  mortgage  loans acquired  by  Norwest Mortgage  pursuant  to a
Delegated Underwriting arrangement with a Correspondent is not reviewed prior to
acquisition of the mortgage loan by Norwest Mortgage although the mortgage  loan
file  is  reviewed by  Norwest Mortgage  to confirm  that certain  documents are
included  in   the  file.   Instead,  Norwest   Mortgage  relies   on  (i)   the
Correspondent's  representations  that such  mortgage  loan was  underwritten in
accordance  with   Norwest  Mortgage's   underwriting  standards   and  (ii)   a
post-purchase  review of  a sampling  of all  mortgage loans  acquired from such
originator. In  addition, in  order to  be eligible  to sell  mortgage loans  to
Norwest   Mortgage  pursuant  to  a   Delegated  Underwriting  arrangement,  the
originator must meet certain requirements including, among other things, certain
quality, operational and financial guidelines.
 
    A prospective borrower applying for a mortgage loan is required to  complete
a detailed application. The loan application elicits pertinent information about
the  applicant,  with particular  emphasis on  the applicant's  financial health
(assets, liabilities, income and expenses), the property being financed and  the
type of loan desired. A self-employed applicant may be required to submit his or
her  most  recent  signed federal  income  tax  returns. With  respect  to every
applicant, credit  reports  are  obtained from  commercial  reporting  services,
summarizing   the  applicant's  credit  history   with  merchants  and  lenders.
Significant unfavorable credit information reported by the applicant or a credit
reporting agency must be explained by  the applicant. The credit review  process
generally is streamlined for borrowers with a qualifying Credit Score.
 
    Verifications  of employment,  income, assets  or mortgages  may be  used to
supplement  the  loan  application   and  the  credit   report  in  reaching   a
determination  as  to  the  applicant's  ability  to  meet  his  or  her monthly
obligations on the proposed mortgage loan, as well as his or her other  mortgage
 
                                       22
<PAGE>
payments  (if  any),  living  expenses  and  financial  obligations.  A mortgage
verification involves  obtaining information  regarding the  borrower's  payment
history  with  respect to  any existing  mortgage the  applicant may  have. This
verification is  accomplished by  either having  the present  lender complete  a
verification  of mortgage form, evaluating the  information on the credit report
concerning  the  applicant's   payment  history  for   the  existing   mortgage,
communicating,  either  verbally or  in  writing, with  the  applicant's present
lender or analyzing cancelled checks provided by the applicant. Verifications of
income, assets or  mortgages may  be waived  under certain  programs offered  by
Norwest  Mortgage, but  Norwest Mortgage's  underwriting guidelines  require, in
most instances, a verbal or written  verification of employment to be  obtained.
In  some cases, 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 interest accruing from the  date
    of  the related Mortgage Note  or date of disbursement  of the Mortgage Loan
    proceeds, whichever is  later, to  the date which  precedes by  30 days  the
    first Due Date under the related Mortgage Note;
 
                                       27
<PAGE>
          (vi)
           the  Mortgaged Property  is undamaged  by water,  fire, earthquake or
           earth  movement,  windstorm,  flood,  tornado  or  similar   casualty
    (excluding  casualty  from the  presence  of hazardous  wastes  or hazardous
    substances, as to which the Seller makes no representation), so as to affect
    adversely the value of the Mortgaged  Property as security for the  Mortgage
    Loan  or the use for which the premises were intended and to the best of the
    Seller's knowledge, there  is no  proceeding pending or  threatened for  the
    total or partial condemnation of the Mortgaged Property;
 
         (vii)
           the  Mortgaged  Property  is free  and  clear of  all  mechanics' and
           materialmen's  liens  or  liens  in  the  nature  thereof;  provided,
    however,  that this warranty  shall be deemed  not to have  been made at the
    time of  the  initial  issuance  of  the  Certificates  if  a  title  policy
    affording,  in substance, the  same protection afforded  by this warranty is
    furnished to the Trustee by the Seller;
 
        (viii)
           except for  Mortgage Loans  secured by  shares in  cooperatives,  the
           Mortgaged  Property consists of  a fee simple  or leasehold estate in
    real property, all of the improvements which are included for the purpose of
    determining the appraised value of the Mortgaged Property lie wholly  within
    the  boundaries  and  building restriction  lines  of such  property  and no
    improvements on adjoining  properties encroach upon  the Mortgaged  Property
    (unless  insured against under an applicable title insurance policy) and, to
    the  best  of  the  Seller's  knowledge,  the  Mortgaged  Property  and  all
    improvements  thereon comply with all  requirements of any applicable zoning
    and subdivision laws and ordinances;
 
          (ix)
           the Mortgage  Loan meets,  or  is exempt  from, applicable  state  or
           federal laws, regulations and other requirements pertaining to usury,
    and the Mortgage Loan is not usurious;
 
           (x)
           to  the best of the Seller's knowledge, all inspections, licenses and
           certificates required  to  be made  or  issued with  respect  to  all
    occupied portions of the Mortgaged Property and, with respect to the use and
    occupancy  of  the  same, including,  but  not limited  to,  certificates of
    occupancy and fire  underwriting certificates,  have been  made or  obtained
    from the appropriate authorities;
 
          (xi)
           all  payments  required to  be made  up to  the Due  Date immediately
           preceding the Cut-Off Date for such Mortgage Loan under the terms  of
    the  related Mortgage Note have been made and no Mortgage Loan had more than
    one delinquency in the 13 months preceding the Cut-Off Date;
 
         (xii)
           the Mortgage Note, the related Mortgage and other agreements executed
           in connection therewith are genuine, and each is the legal, valid and
    binding obligation of the maker thereof, enforceable in accordance with  its
    terms  except as such enforcement may  be limited by bankruptcy, insolvency,
    reorganization or other similar laws affecting the enforcement of creditors'
    rights generally and  by general  equity principles  (regardless of  whether
    such enforcement is considered in a proceeding in equity or at law); and, to
    the best of the Seller's knowledge, all parties to the Mortgage Note and the
    Mortgage  had legal capacity  to execute the Mortgage  Note and the Mortgage
    and each Mortgage Note and Mortgage  has been duly and properly executed  by
    the mortgagor;
 
        (xiii)
           any  and all  requirements of  any federal,  state or  local law with
           respect to the origination of  the Mortgage Loans including,  without
    limitation,  truth-in-lending, real  estate settlement  procedures, consumer
    credit protection, equal credit opportunity or disclosure laws applicable to
    the Mortgage Loans have been complied with;
 
         (xiv)
           the proceeds of the Mortgage  Loans have been fully disbursed,  there
           is  no requirement  for future  advances thereunder  and any  and all
    requirements as to completion of any on-site or off-site improvements and as
    to disbursements  of any  escrow  funds therefor  have been  complied  with,
    except  for escrow funds for exterior items which could not be completed due
    to weather; and all costs, fees and expenses incurred in making, closing  or
    recording  the  Mortgage Loan  have been  paid,  except recording  fees with
    respect to  Mortgages  not  recorded as  of  the  date of  the  Pooling  and
    Servicing Agreement;
 
                                       28
<PAGE>
          (xv)
           the  Mortgage Loan (except a T.O.P. Loan as described above under "--
           Mortgage  Loan  Underwriting"  and  any  Mortgage  Loan  secured   by
    Mortgaged Property located in Iowa, as to which an opinion of counsel of the
    type  customarily  rendered in  such  State in  lieu  of title  insurance is
    instead received) is covered by an ALTA mortgagee title insurance policy  or
    other generally acceptable form of policy or insurance acceptable to FNMA or
    FHLMC,  issued by a title  insurer acceptable to FNMA  or FHLMC insuring the
    originator, its successors and assigns, as to the first priority lien of the
    Mortgage in the original principal amount  of the Mortgage Loan and  subject
    only  to (A) the lien of current real property taxes and assessments not yet
    due and payable, (B) covenants, conditions and restrictions,  rights-of-way,
    easements  and other matters of public record as of the date of recording of
    such Mortgage acceptable  to mortgage  lending institutions in  the area  in
    which  the Mortgaged Property is located  or specifically referred to in the
    appraisal performed  in  connection  with the  origination  of  the  related
    Mortgage  Loan, (C)  liens created pursuant  to any federal,  state or local
    law, regulation or ordinance  affording liens for the  costs of clean-up  of
    hazardous   substances  or  hazardous  wastes  or  for  other  environmental
    protection purposes and (D) such other matters to which like properties  are
    commonly  subject which do not individually, or in the aggregate, materially
    interfere with the benefits of the  security intended to be provided by  the
    Mortgage;  the Seller is the sole  insured of such mortgagee title insurance
    policy, the  assignment to  the Trustee  of the  Seller's interest  in  such
    mortgagee  title  insurance  policy  does  not  require  any  consent  of or
    notification to  the insurer  which  has not  been  obtained or  made,  such
    mortgagee  title insurance policy is in full force and effect and will be in
    full force and effect and inure to the benefit of the Trustee and no  claims
    have  been made  under such mortgagee  title insurance policy,  and no prior
    holder of the related  Mortgage, including the Seller,  has done, by act  or
    omission,  anything which would impair the  coverage of such mortgagee title
    insurance policy;
 
         (xvi)
           the Mortgaged Property securing each  Mortgage Loan is insured by  an
           insurer  acceptable to  FNMA or FHLMC  against loss by  fire and such
    hazards as are covered under a standard extended coverage endorsement, in an
    amount which is not less than the  lesser of 100% of the insurable value  of
    the Mortgaged Property and the outstanding principal balance of the Mortgage
    Loan,  but  in no  event less  than  the minimum  amount necessary  to fully
    compensate for  any damage  or loss  on  a replacement  cost basis;  if  the
    Mortgaged  Property is a condominium unit, it is included under the coverage
    afforded by a  blanket policy for  the project; if  upon origination of  the
    Mortgage  Loan, the improvements  on the Mortgaged Property  were in an area
    identified in  the  Federal Register  by  the Federal  Emergency  Management
    Agency as having special flood hazards, a flood insurance policy meeting the
    requirements   of   the  current   guidelines   of  the   Federal  Insurance
    Administration is in effect with  a generally acceptable insurance  carrier,
    in  an  amount representing  coverage not  less  than the  least of  (A) the
    outstanding principal balance of the  Mortgage Loan, (B) the full  insurable
    value  of the  Mortgaged Property  and (C)  the maximum  amount of insurance
    which was available  under the Flood  Disaster Protection Act  of 1973;  and
    each  Mortgage  obligates  the  mortgagor thereunder  to  maintain  all such
    insurance at the mortgagor's cost and expense;
 
        (xvii)
           to the best of the Seller's  knowledge, there is no default,  breach,
           violation or event of acceleration existing under any Mortgage or the
    related  Mortgage Note and no event which,  with the passage of time or with
    notice and the expiration  of any grace or  cure period, would constitute  a
    default,  breach, violation or event of acceleration; and the Seller has not
    waived  any  default,  breach,  violation  or  event  of  acceleration;   no
    foreclosure  action is threatened or has  been commenced with respect to the
    Mortgage Loan;
 
       (xviii)
           no Mortgage Note or Mortgage is  subject to any right of  rescission,
           set-off, counterclaim or defense, including the defense of usury, nor
    will  the operation of any of the terms of the Mortgage Note or Mortgage, or
    the   exercise   of   any    right   thereunder,   render   such    Mortgage
 
                                       29
<PAGE>
    unenforceable,  in  whole  or  in  part,  or  subject  it  to  any  right of
    rescission, set-off,  counterclaim  or  defense, including  the  defense  of
    usury, and no such right of rescission, set-off, counterclaim or defense has
    been asserted with respect thereto;
 
         (xix)
           each  Mortgage  Note is  payable  in monthly  payments,  resulting in
           complete amortization of the  Mortgage Loan over a  term of not  more
    than 360 months;
 
          (xx)
           each  Mortgage contains customary and  enforceable provisions such as
           to render the rights and remedies of the holder thereof adequate  for
    the  realization  against  the Mortgaged  Property  of the  benefits  of the
    security, including  realization by  judicial  foreclosure (subject  to  any
    limitation  arising from  any bankruptcy,  insolvency or  other law  for the
    relief of debtors), and there is  no homestead or other exemption  available
    to the mortgagor which would interfere with such right of foreclosure;
 
         (xxi)
           to  the best of the  Seller's knowledge, no mortgagor  is a debtor in
           any state or federal bankruptcy or insolvency proceeding;
 
        (xxii)
           each Mortgaged Property is located in the United States and  consists
           of  a one- to four-unit single  family residential property which may
    include a detached home, townhouse, condominium unit, unit in a planned unit
    development or a leasehold interest with respect to any of the foregoing or,
    in the case of Mortgage Loans  secured by shares of cooperatives, leases  or
    occupancy agreements;
 
       (xxiii)
           with  respect  to  each Buy-Down  Loan,  the funds  deposited  in the
           Buy-Down Fund, if  any, will  be sufficient,  together with  interest
    thereon  at  the rate  customarily  received by  the  Seller on  such funds,
    compounded monthly,  and adding  the  amounts required  to  be paid  by  the
    mortgagor,  to make the  scheduled payments stated in  the Mortgage Note for
    the term of the buy-down agreement; and
 
        (xxiv)
           each Mortgage Loan is  a "Qualified Mortgage"  within the meaning  of
           Section 860G of the Code.
 
    No  representations or warranties are made by  the Seller or any other party
as to the absence or effect of  hazardous wastes or hazardous substances on  any
of  the Mortgaged Properties or  on the lien of any  Mortgage or with respect to
the absence or effect of fraud in the origination of any Mortgage Loan, and  any
loss  or  liability resulting  from  the presence  or  effect of  such hazardous
wastes,   hazardous   substances   or   fraud   will   be   borne   solely    by
Certificateholders.  See  "Certain  Legal  Aspects  of  the  Mortgage  Loans  --
Environmental Considerations" below.
 
    See "The Pooling and Servicing Agreement -- Assignment of Mortgage Loans  to
the  Trustee" for a description of  the limited remedies available in connection
with breaches of the foregoing representations and warranties.
 
                        DESCRIPTION OF THE CERTIFICATES
 
GENERAL
 
    Each Series of Certificates will include one or more Classes, each of  which
may  be  divided into  two  or more  Subclasses.  Any references  herein  to the
characteristics of a Class of Certificates may also describe the characteristics
of  a  Subclass  of  Certificates.  In  addition,  any  Class  or  Subclass   of
Certificates  may consist of two or more non-severable components, each of which
may exhibit any of the  principal or interest payment characteristics  described
herein with respect to a Class of Certificates. A Series may include one or more
Classes  of  Certificates entitled,  to the  extent of  funds available,  to (i)
principal and interest distributions in  respect of the related Mortgage  Loans,
(ii)  principal distributions,  with no  interest distributions,  (iii) interest
distributions, with no principal distributions or (iv) such other  distributions
as are described in the applicable Prospectus Supplement.
 
                                       30
<PAGE>
    Each  Series  of  Certificates will  be  issued  pursuant to  a  Pooling and
Servicing Agreement (the  "Pooling and Servicing  Agreement") among the  Seller,
Norwest  Bank, as the Master  Servicer, and the Trustee  named in the applicable
Prospectus Supplement. An illustrative form  of Pooling and Servicing  Agreement
has  been  filed as  an  exhibit to  the  Registration Statement  of  which this
Prospectus is a part. The following summaries describe certain provisions common
to the Certificates and to each  Pooling and Servicing Agreement. The  summaries
do  not purport to  be complete and are  subject to, and  are qualified in their
entirety by reference  to, all of  the provisions of  the Pooling and  Servicing
Agreement  for  each  Series  of  Certificates  and  the  applicable  Prospectus
Supplement. Wherever particular  sections or  defined terms of  the Pooling  and
Servicing  Agreement are referred to, such sections or defined terms are thereby
incorporated herein  by  reference  from  the  form  of  Pooling  and  Servicing
Agreement filed as an exhibit to the Registration Statement.
 
    Unless   otherwise  specified  in   the  applicable  Prospectus  Supplement,
distributions  to  Certificateholders  of  all  Series  (other  than  the  final
distribution  in retirement of the Certificates) will be made by check mailed to
the address of  the person  entitled thereto (which  in the  case of  Book-Entry
Certificates  will be  DTC) as  it appears  on the  certificate register, except
that, with respect to  any holder of  a Certificate evidencing  not less than  a
certain  minimum denomination set forth in the applicable Prospectus Supplement,
distributions will  be made  by wire  transfer in  immediately available  funds,
provided  that the Master Servicer  or the Paying Agent  acting on behalf of the
Master Servicer shall have been  furnished with appropriate wiring  instructions
not  less than seven business  days prior to the  related Distribution Date. The
final distribution  in  retirement  of  Certificates  will  be  made  only  upon
presentation  and  surrender  of  the  Certificates  at  the  office  or  agency
maintained by the Trustee or other entity for such purpose, as specified in  the
final distribution notice to Certificateholders.
 
    Each  Series  of  Certificates  will represent  ownership  interests  in the
related Trust Estate. An election may be made to treat the Trust Estate (or  one
or  more  segregated  pools of  assets  therein)  with respect  to  a  Series of
Certificates as a REMIC. If such an  election is made, such Series will  consist
of  one or more Classes of  Certificates that will represent "regular interests"
within  the  meaning  of  Code   Section  860G(a)(1)  (such  Class  or   Classes
collectively  referred  to  as  the "Regular  Certificates")  and  one  Class or
Subclass of Certificates with respect to  each REMIC that will be designated  as
the  "residual  interest" within  the meaning  of  Code Section  860G(a)(2) (the
"Residual Certificates")  representing the  right  to receive  distributions  as
specified  in the  Prospectus Supplement for  such Series.  See "Certain Federal
Income Tax Consequences" herein.
 
    The Seller may sell certain Classes  or Subclasses of the Certificates of  a
Series, including one or more Classes of Subordinated Certificates, in privately
negotiated  transactions  exempt  from registration  under  the  Securities Act.
Alternatively, if  so specified  in  a Prospectus  Supplement relating  to  such
Subordinated  Certificates,  the Seller  may offer  one or  more Classes  of the
Subordinated Certificates  of a  Series by  means of  this Prospectus  and  such
Prospectus Supplement.
 
DEFINITIVE FORM
 
    Certificates  of a Series that are  issued in fully registered, certificated
form are  referred  to herein  as  "Definitive Certificates."  Distributions  of
principal of, and interest on, the Definitive Certificates will be made directly
to  holders of  Definitive Certificates  in accordance  with the  procedures set
forth in the Pooling and Servicing  Agreement. The Definitive Certificates of  a
Series offered hereby and by means of the applicable Prospectus Supplements will
be  transferable  and exchangeable  at the  office or  agency maintained  by the
Trustee or  such other  entity for  such  purpose set  forth in  the  applicable
Prospectus  Supplement.  No service  charge  will be  made  for any  transfer or
exchange of Definitive Certificates,  but the Trustee or  such other entity  may
require  payment of  a sum  sufficient to  cover any  tax or  other governmental
charge in connection with such transfer or exchange.
 
    In the event that an election is made  to treat the Trust Estate (or one  or
more  segregated pools  of assets therein)  as a REMIC,  the "residual interest"
thereof will  be issued  as a  Definitive Certificate.  No legal  or  beneficial
interest  in all or  any portion of  any "residual interest"  may be transferred
without the receipt by the transferor and the Trustee of an affidavit signed  by
the transferee stating,
 
                                       31
<PAGE>
among  other things, that the transferee  (i) is not a disqualified organization
within the meaning  of Code  Section 860E(e) or  an agent  (including a  broker,
nominee,  or  middleman) thereof  and  (ii) understands  that  it may  incur tax
liabilities in excess  of any  cash flows  generated by  the residual  interest.
Further, the transferee must state in the affidavit that it (x) historically has
paid  its debts as they have come due, (y) intends to pay its debts as they come
due in the  future and  (z) intends  to pay  taxes associated  with holding  the
residual interest as they become due. The transferor must certify to the Trustee
that, as of the time of the transfer, it has no actual knowledge that any of the
statements made in the transferee affidavit are false and no reason to know that
the  statements made by the  transferee pursuant to clauses  (x), (y) and (z) of
the preceding sentence are false.  See "Certain Federal Income Tax  Consequences
- --  Federal  Income  Tax  Consequences for  REMIC  Certificates  --  Taxation of
Residual Certificates  --  Tax-Related  Restrictions  on  Transfer  of  Residual
Certificates."
 
BOOK-ENTRY FORM
 
    Each  Class or Subclass of the Book-Entry Certificates of a Series initially
will be represented by one or more physical certificates registered in the  name
of  Cede  & Co.  ("Cede"), as  nominee of  DTC,  which will  be the  "holder" or
"Certificateholder" of  such Certificates,  as such  terms are  used herein.  No
person  acquiring an interest in a Book-Entry Certificate (a "Beneficial Owner")
will be entitled to receive a Definitive Certificate representing such  person's
interest  in the Book-Entry  Certificate, except as set  forth below. Unless and
until  Definitive  Certificates  are  issued  under  the  limited  circumstances
described  herein,  all references  to  actions taken  by  Certificateholders or
holders shall, in  the case  of the  Book-Entry Certificates,  refer to  actions
taken  by DTC  upon instructions from  its DTC Participants,  and all references
herein to distributions, notices,  reports and statements to  Certificateholders
or  holders  shall,  in  the  case  of  the  Book-Entry  Certificates,  refer to
distributions, notices, reports and statements to DTC or Cede, as the registered
holder of the Book-Entry Certificates, as  the case may be, for distribution  to
Beneficial Owners in accordance with DTC procedures.
 
    DTC is a limited purpose trust company organized under the laws of the State
of  New York, a member  of the Federal Reserve  System, a "clearing corporation"
within the  meaning of  the New  York Uniform  Commercial Code  and a  "clearing
agency"  registered pursuant  to Section 17A  of the Securities  Exchange Act of
1934, as  amended. DTC  was created  to hold  securities for  its  participating
organizations   ("DTC  Participants")  and  to   facilitate  the  clearance  and
settlement of securities transactions among DTC Participants through  electronic
book-entries,   thereby   eliminating  the   need   for  physical   movement  of
certificates. DTC Participants include securities brokers and dealers (which may
include any underwriter  identified in the  Prospectus Supplement applicable  to
any  Series), banks, trust companies  and clearing corporations. Indirect access
to the DTC system also is available to banks, brokers, dealers, trust  companies
and  other institutions that clear through  or maintain a custodial relationship
with  a  DTC   Participant,  either  directly   or  indirectly  ("Indirect   DTC
Participants").
 
    Under  the rules, regulations and procedures  creating and affecting DTC and
its operations (the "Rules"),  DTC is required to  make book-entry transfers  of
Book-Entry  Certificates among  DTC Participants  on whose  behalf it  acts with
respect to the Book-Entry Certificates and to receive and transmit distributions
of principal of and  interest on the  Book-Entry Certificates. DTC  Participants
and  Indirect DTC Participants  with which Beneficial  Owners have accounts with
respect to the Book-Entry Certificates similarly are required to make book-entry
transfers and receive and transmit such  payments on behalf of their  respective
Beneficial Owners.
 
    Beneficial Owners that are not DTC Participants or Indirect DTC Participants
but  desire  to purchase,  sell  or otherwise  transfer  ownership of,  or other
interests in, Book-Entry Certificates  may do so  only through DTC  Participants
and  Indirect DTC Participants. In addition,  Beneficial Owners will receive all
distributions of principal and  interest from the Master  Servicer, or a  Paying
Agent  on  behalf of  the Master  Servicer, through  DTC Participants.  DTC will
forward such  distributions  to  its DTC  Participants,  which  thereafter  will
forward  them  to Indirect  DTC  Participants or  Beneficial  Owners. Beneficial
Owners will not  be recognized  by the  Trustee or  the Master  Servicer or  any
paying
 
                                       32
<PAGE>
agent  as Certificateholders, as such term is  used in the Pooling and Servicing
Agreement, and Beneficial  Owners will be  permitted to exercise  the rights  of
Certificateholders only indirectly through DTC and its DTC Participants.
 
    Because  DTC can only act on behalf of  DTC Participants, who in turn act on
behalf of  Indirect  DTC  Participants  and certain  banks,  the  ability  of  a
Beneficial  Owner to pledge Book-Entry Certificates  to persons or entities that
do not participate in the DTC system,  or to otherwise act with respect to  such
Book-Entry  Certificates,  may  be  limited  due  to  the  lack  of  a  physical
certificate for such  Book-Entry Certificates. In  addition, under a  book-entry
format,  Beneficial Owners may  experience delays in  their receipt of payments,
since distributions will be made  by the Master Servicer,  or a paying agent  on
behalf of the Master Servicer, to Cede, as nominee for DTC.
 
    DTC  has advised  the Seller that  it will  take any action  permitted to be
taken by a Certificateholder under the  Pooling and Servicing Agreement only  at
the  direction of one  or more DTC  Participants to whose  accounts with DTC the
Book-Entry Certificates are credited. Additionally,  DTC has advised the  Seller
that  it will take such actions with  respect to specified Voting Interests only
at the  direction  of  and on  behalf  of  DTC Participants  whose  holdings  of
Book-Entry  Certificates evidence such specified  Voting Interests. DTC may take
conflicting actions with  respect to  Voting Interests  to the  extent that  DTC
Participants  whose  holdings of  Book-Entry  Certificates evidence  such Voting
Interests authorize divergent action.
 
    Neither the  Seller, the  Master  Servicer nor  the  Trustee will  have  any
responsibility  for any aspect  of the records  relating to or  payments made on
account of beneficial ownership interests of the Book-Entry Certificates held by
Cede, as  nominee for  DTC, or  for maintaining,  supervising or  reviewing  any
records  relating to  such beneficial ownership  interests. In the  event of the
insolvency of DTC,  a DTC Participant  or an Indirect  DTC Participant in  whose
name  Book-Entry  Certificates are  registered,  the ability  of  the Beneficial
Owners of such  Book-Entry Certificates  to obtain  timely payment  and, if  the
limits  of applicable insurance  coverage by the  Securities Investor Protection
Corporation are exceeded or if such coverage is otherwise unavailable,  ultimate
payment,  of amounts distributable with  respect to such Book-Entry Certificates
may be impaired.
 
    The Book-Entry Certificates will be converted to Definitive Certificates and
reissued to  Beneficial Owners  or their  nominees, rather  than to  DTC or  its
nominee,  only if (i)  the Trustee is advised  in writing that  DTC is no longer
willing or able to  discharge properly its  responsibilities as depository  with
respect  to the Book-Entry  Certificates and the  Trustee is unable  to locate a
qualified successor,  (ii)  the  Master  Servicer,  at  its  option,  elects  to
terminate  the book-entry system through DTC or  (iii) after the occurrence of a
dismissal or resignation of the Master Servicer under the Pooling and  Servicing
Agreement,  Beneficial  Owners  representing not  less  than 51%  of  the Voting
Interests of the outstanding Book-Entry Certificates advise the Trustee  through
DTC,  in writing, that the continuation of a book-entry system through DTC (or a
successor thereto) is no longer in the Beneficial Owners' best interest.
 
    Upon the  occurrence of  any event  described in  the immediately  preceding
paragraph,  the Trustee will be required to notify all Beneficial Owners through
DTC Participants of the availability of Definitive Certificates. Upon  surrender
by DTC of the physical certificates representing the Book-Entry Certificates and
receipt  of instructions for re-registration, the Trustee will reissue the Book-
Entry  Certificates  as  Definitive  Certificates  to  Beneficial  Owners.   The
procedures  relating to payment on and transfer of Certificates initially issued
as  Definitive   Certificates  will   thereafter  apply   to  those   Book-Entry
Certificates that have been reissued as Definitive Certificates.
 
DISTRIBUTIONS TO CERTIFICATEHOLDERS
 
    GENERAL.  On each Distribution Date, each holder of a Certificate of a Class
will be entitled to receive its Certificate's Percentage Interest of the portion
of  the Pool Distribution Amount (as defined below) allocated to such Class. The
undivided percentage  interest (the  "Percentage Interest")  represented by  any
Certificate  of a  Subclass or  any Class in  distributions to  such Subclass or
Class will be
 
                                       33
<PAGE>
equal to the percentage obtained by  dividing the initial principal balance  (or
notional  amount) of such Certificate by the aggregate initial principal balance
(or notional amount) of all Certificates of such Subclass or Class, as the  case
may be.
 
    In  general, the funds available for distribution to Certificateholders of a
Series of Certificates with  respect to each Distribution  Date for such  Series
(the "Pool Distribution Amount") will be the sum of all previously undistributed
payments  or  other  receipts  on  account  of  principal  (including  principal
prepayments and Liquidation Proceeds, if any)  and interest on or in respect  of
the  related Mortgage Loans  received by the related  Servicer after the Cut-Off
Date (except for amounts due  on or prior to the  Cut-Off Date), or received  by
the  related Servicer on or prior to the  Cut-Off Date but due after the Cut-Off
Date, in either  case received on  or prior  to the business  day preceding  the
Determination Date in the month in which such Distribution Date occurs, plus all
Periodic  Advances with respect to  payments due to be  received on the Mortgage
Loans on  the Due  Date  preceding such  Distribution  Date, but  excluding  the
following:
 
           (a)
           amounts received as late payments of principal or interest respecting
           which one or more unreimbursed Periodic Advances has been made;
 
           (b)
           that  portion of Liquidation Proceeds with respect to a Mortgage Loan
           which represents any unreimbursed Periodic Advances;
 
           (c)
           those portions of each payment  of interest on a particular  Mortgage
           Loan  which represent (i) the Fixed  Retained Yield, if any, (ii) the
    applicable Servicing Fee,  (iii) the applicable  Master Servicing Fee,  (iv)
    the  Trustee's fee  and (v)  any other  amounts described  in the applicable
    Prospectus Supplement;
 
           (d)
           all amounts representing scheduled payments of principal and interest
           due after  the  Due  Date  occurring  in  the  month  in  which  such
    Distribution Date occurs;
 
           (e)
           all  proceeds (including Liquidation Proceeds  other than, in certain
           cases  as  specified   in  the   applicable  Prospectus   Supplement,
    Liquidation  Proceeds which  were received  prior to  the related Servicer's
    determination that no further recoveries  on a defaulted Mortgage Loan  will
    be  forthcoming ("Partial Liquidation Proceeds"))  of any Mortgage Loans, or
    property acquired  in respect  thereof,  that were  liquidated,  foreclosed,
    purchased  or repurchased pursuant  to the applicable  Pooling and Servicing
    Agreement, which proceeds were received on  or after the Due Date  occurring
    in  the  month in  which  such Distribution  Date  occurs and  all principal
    prepayments in full, partial  principal prepayments and Partial  Liquidation
    Proceeds received by the related Servicer on or after the Determination Date
    (or,  in certain cases as specified in the applicable Prospectus Supplement,
    the Due Date) occurring in the month in which such Distribution Date occurs,
    and all related payments of interest on such amounts;
 
           (f)
           that portion  of Liquidation  Proceeds  which represents  any  unpaid
           Servicing  Fees, Master Servicing Fee or any Trustee Fee to which the
    related Servicer,  the  Trustee or  the  Master Servicer,  respectively,  is
    entitled and any unpaid Fixed Retained Yield;
 
           (g)
           if  an election has been made to treat the applicable Trust Estate as
           a  REMIC,  any   Net  Foreclosure  Profits   with  respect  to   such
    Distribution Date;
 
           (h)
           all  amounts representing certain expenses reimbursable to the Master
           Servicer or any Servicer and other amounts permitted to be  withdrawn
    by  the Master Servicer from the  Certificate Account, in each case pursuant
    to the applicable Pooling and Servicing Agreement;
 
           (i)
           all amounts in the nature  of late fees, assumption fees,  prepayment
           fees  and similar fees and payments  of interest related to principal
    prepayments received on  or after  the first  day of  the month  in which  a
    Distribution Date occurs and prior to the Determination Date in the month of
    such  Distribution Date  which the  related Servicer  is entitled  to retain
    pursuant to the applicable Underlying Servicing Agreement;
 
                                       34
<PAGE>
           (j)
           reinvestment earnings on payments received in respect of the Mortgage
           Loans; and
 
           (k)
           any  recovery  of  an  amount  in  respect  of  principal  which  had
           previously  been  allocated  as a  realized  loss to  such  Series of
    Certificates.
 
    The  applicable  Prospectus  Supplement  for  a  Series  will  describe  any
variation in the calculation of the Pool Distribution Amount for such Series.
 
    "Net  Foreclosure Profits" with  respect to a Distribution  Date will be the
excess of (i) the portion of aggregate net Liquidation Proceeds which represents
the amount by which aggregate profits on Liquidated Loans with respect to  which
net  Liquidation  Proceeds  exceed  the unpaid  principal  balance  thereof plus
accrued interest  thereon at  the  Mortgage Interest  Rate over  (ii)  aggregate
realized  losses  on  Liquidated Loans  with  respect to  which  net Liquidation
Proceeds are  less  than  the  unpaid principal  balance  thereof  plus  accrued
interest thereon at the Mortgage Interest Rate.
 
    DISTRIBUTIONS  OF INTEREST.   With respect  to each  Series of Certificates,
interest on the related Mortgage Loans at the weighted average of the applicable
Net Mortgage Interest Rates thereof, will  be passed through monthly to  holders
of  the related Classes of Certificates in the aggregate, in accordance with the
particular terms of each such Class of Certificates. The "Net Mortgage  Interest
Rate"  for each Mortgage Loan in a given period will equal the mortgage interest
rate for such Mortgage Loan in such period, as specified in the related mortgage
note (the  "Mortgage Interest  Rate"), less  the portion  thereof, if  any,  not
contained  in the  Trust Estate (the  "Fixed Retained Yield"),  and less amounts
payable to the Servicers for servicing the Mortgage Loan (the "Servicing  Fee"),
the  fee payable to  the Master Servicer  (the "Master Servicing  Fee"), the fee
payable to the Trustee (the "Trustee Fee") and any related expenses specified in
the applicable Prospectus.
 
    Interest will  accrue  on the  principal  balance (or  notional  amount,  as
described  below)  of each  Class of  Certificates entitled  to interest  at the
Pass-Through  Rate  for  such  Class  indicated  in  the  applicable  Prospectus
Supplement  (which may be a fixed rate or  an adjustable rate) from the date and
for the periods specified in such Prospectus Supplement. To the extent the  Pool
Distribution  Amount is  available therefor,  interest accrued  during each such
specified period on each Class of Certificates entitled to interest (other  than
a  Class that provides for interest that  accrues, but is not currently payable,
referred to hereafter as  "Accrual Certificates") will  be distributable on  the
Distribution  Dates specified in the  applicable Prospectus Supplement until the
principal balance (or notional amount) of  such Class has been reduced to  zero.
Distributions  allocable to interest on each Certificate that is not entitled to
distributions allocable to principal will  generally be calculated based on  the
notional  amount of such Certificate. The  notional amount of a Certificate will
not evidence  an  interest  in  or entitlement  to  distributions  allocable  to
principal  but will be  solely for convenience in  expressing the calculation of
interest and for certain other purposes.
 
    With respect to  any Class of  Accrual Certificates, any  interest that  has
accrued  but is  not paid  on a  given Distribution  Date will  be added  to the
principal balance  of such  Class  of Certificates  on that  Distribution  Date.
Distributions  of interest on  each Class of  Accrual Certificates will commence
only after the  occurrence of the  events or the  existence of the  circumstance
specified  in such  Prospectus Supplement  and, prior  to such  time, or  in the
absence of such circumstances, the principal balance of such Class will increase
on each Distribution Date by the amount  of interest that accrued on such  Class
during  the preceding interest  accrual period but  that was not  required to be
distributed to such Class on such  Distribution Date. Any such Class of  Accrual
Certificates  will  thereafter  accrue  interest  on  its  outstanding principal
balance as so adjusted.
 
    DISTRIBUTIONS  OF  PRINCIPAL.    The  principal  balance  of  any  Class  of
Certificates  entitled  to  distributions  of principal  will  generally  be the
original  principal  balance  of  such   Class  specified  in  such   Prospectus
Supplement,  reduced  by  all  distributions reported  to  the  holders  of such
Certificates as allocable to  principal and any losses  on the related  Mortgage
Loans  allocated to such  Class of Certificates  and (i) in  the case of Accrual
Certificates, increased by all  interest accrued but  not then distributable  on
such  Accrual Certificates  and (ii)  in the  case of  a Series  of Certificates
representing
 
                                       35
<PAGE>
interests in a Trust Estate containing adjustable rate Mortgage Loans, increased
by any Deferred  Interest allocable to  such Class. The  principal balance of  a
Class  or Subclass  of Certificates  generally represents  the maximum specified
dollar amount (exclusive of (i)  any interest that may  accrue on such Class  or
Subclass  to which  the holder  thereof is  entitled from  the cash  flow on the
related Mortgage  Loans  at  such  time)  and will  decline  to  the  extent  of
distributions  in  reduction of  the principal  balance  of, and  allocations of
losses to such Class  or Subclass. Certificates with  no principal balance  will
not  receive distributions  in respect  of principal.  The applicable Prospectus
Supplement will  specify the  method by  which  the amount  of principal  to  be
distributed on the Certificates on each Distribution Date will be calculated and
the  manner  in  which  such  amount will  be  allocated  among  the  Classes of
Certificates entitled to distributions of principal.
 
    If so provided in the applicable Prospectus Supplement, one or more  Classes
of  Senior Certificates  will be entitled  to receive all  or a disproportionate
percentage of the  payments of  principal that  are received  from borrowers  in
advance  of  their  scheduled  due  dates and  are  not  accompanied  by amounts
representing scheduled interest  due after  the months  of such  payments or  of
other  unscheduled principal receipts or recoveries in the percentages and under
the circumstances or for  the periods specified  in such Prospectus  Supplement.
Any  such allocation of  principal prepayments or  other unscheduled receipts or
recoveries  in  respect  of  principal  to  such  Class  or  Classes  of  Senior
Certificates  will  have the  effect of  accelerating  the amortization  of such
Senior Certificates while increasing the interests evidenced by the Subordinated
Certificates in the Trust Estate.  Increasing the interests of the  Subordinated
Certificates relative to that of the Senior Certificates is intended to preserve
the availability of the subordination provided by the Subordinated Certificates.
 
    If  specified in  the applicable  Prospectus Supplement,  the rights  of the
holders of the Subordinated Certificates of  a Series of Certificates for  which
credit  enhancement is  provided through subordination  to receive distributions
with respect  to  the  Mortgage  Loans  in the  related  Trust  Estate  will  be
subordinated  to such rights  of the holders  of the Senior  Certificates of the
same Series to the extent described below, except as otherwise set forth in such
Prospectus Supplement. This subordination is intended to enhance the  likelihood
of  regular receipt  by holders  of Senior  Certificates of  the full  amount of
scheduled monthly payments  of principal and  interest due them  and to  provide
limited  protection to the holders of the Senior Certificates against losses due
to mortgagor defaults.
 
    The protection afforded to the holders of Senior Certificates of a Series of
Certificates for which credit enhancement  is provided through subordination  by
the   subordination  feature  described  above  will  be  effected  by  (i)  the
preferential right of such holders to  receive, prior to any distribution  being
made  in respect of  the related Subordinated  Certificates on each Distribution
Date, current  distributions on  the  related Mortgage  Loans of  principal  and
interest  due them  on each  Distribution Date  out of  the funds  available for
distribution on such date in the related Certificate Account, (ii) by the  right
of such holders to receive future distributions on the Mortgage Loans that would
otherwise  have been payable to the  holders of Subordinated Certificates and/or
(iii) by  the prior  allocation to  the Subordinated  Certificates of  all or  a
portion of losses realized on the related Mortgage Loans.
 
    Losses  realized  on liquidated  Mortgage Loans  (other than  Excess Special
Hazard Losses, Excess  Fraud Losses  and Excess Bankruptcy  Losses as  described
below)  will be allocated to the  holders of Subordinated Certificates through a
reduction of the  amount of principal  payments on the  Mortgage Loans to  which
such  holders are entitled before any corresponding reduction is made in respect
of the Senior Certificate.
 
    A "Special Hazard Loss" is a loss on a liquidated Mortgage Loan occurring as
a result  of a  hazard not  insured against  under a  standard hazard  insurance
policy  of the type described herein under  "The Trust Estates -- Mortgage Loans
- -- Insurance Policies." A "Fraud Loss" is  a loss on a liquidated Mortgage  Loan
as  to  which  there was  fraud  in the  origination  of such  Mortgage  Loan. A
"Bankruptcy Loss"  is a  loss  on a  liquidated  Mortgage Loan  attributable  to
certain  actions which may be  taken by a bankruptcy  court in connection with a
Mortgage Loan, including  a reduction  by a  bankruptcy court  of the  principal
balance  of or  the interest  rate on  a Mortgage  Loan or  an extension  of its
maturity. Special
 
                                       36
<PAGE>
Hazard Losses in  excess of the  amount specified in  the applicable  Prospectus
Supplement  (the  "Special  Hazard  Loss  Amount")  are  "Excess  Special Hazard
Losses." Fraud  Losses in  excess  of the  amount  specified in  the  applicable
Prospectus  Supplement  (the "Fraud  Loss  Amount") are  "Excess  Fraud Losses."
Bankruptcy losses in excess of the amount specified in the applicable Prospectus
Supplement (the "Bankruptcy  Loss Amount") are  "Excess Bankruptcy Losses."  Any
Excess  Special Hazard Losses,  Excess Fraud Losses  or Excess Bankruptcy Losses
with respect to a Series will be allocated on a pro rata basis among the related
Classes of Senior and  Subordinated Certificates. An allocation  of a loss on  a
"pro  rata basis" among two or more  Classes of Certificates means an allocation
on a pro rata  basis to each such  Class of Certificates on  the basis of  their
then-outstanding  principal balances in  the case of the  principal portion of a
loss or based on the accrued interest thereon in the case of an interest portion
of a loss.
 
    Since the amounts of the Special  Hazard Loss Amount, Fraud Loss Amount  and
Bankruptcy Loss Amount for a Series of Certificates are each expected to be less
than the amount of principal payments on the Mortgage Loans to which the holders
of  the Subordinated  Certificates of such  Series are  initially entitled (such
amount being subject to reduction, as described above, as a result of allocation
of losses on liquidated Mortgage Loans that are not Special Hazard Losses, Fraud
Losses or Bankruptcy Losses), the  holders of Subordinated Certificates of  such
Series  will bear the risk of Special Hazard Losses, Fraud Losses and Bankruptcy
Losses to  a  lesser extent  than  they will  bear  other losses  on  liquidated
Mortgage Loans.
 
    Although  the subordination feature  described above is  intended to enhance
the likelihood of  timely payment of  principal and interest  to the holders  of
Senior  Certificates,  shortfalls  could result  in  certain  circumstances. For
example, a shortfall in  the payment of principal  otherwise due the holders  of
Senior  Certificates could occur if  losses realized on the  Mortgage Loans in a
Trust Estate  were exceptionally  high  and were  concentrated in  a  particular
month.
 
    The  holders of Subordinated Certificates will not be required to refund any
amounts previously properly distributed to them, regardless of whether there are
sufficient funds on a subsequent Distribution  Date to make a full  distribution
to holders of each Class of Senior Certificates of the same Series.
 
OTHER CREDIT ENHANCEMENT
 
    In  addition to, or in substitution  for, the subordination discussed above,
credit enhancement may be provided with respect to any Series of Certificates in
any other manner which may be described in the applicable Prospectus Supplement,
including, but not limited to, credit enhancement through an alternative form of
subordination and/or one or more of the methods described below.
 
    LIMITED GUARANTEE
 
    If so specified  in the Prospectus  Supplement with respect  to a Series  of
Certificates,  credit  enhancement may  be  provided in  the  form of  a limited
guarantee issued by a guarantor named therein.
 
    FINANCIAL GUARANTY INSURANCE POLICY OR SURETY BOND
 
    If so specified  in the Prospectus  Supplement with respect  to a Series  of
Certificates  credit  enhancement may  be provided  in the  form of  a financial
guaranty insurance policy or a surety bond issued by an insurer named therein.
 
    LETTER OF CREDIT
 
    Alternative credit support with respect to  a Series of Certificates may  be
provided  by  the  issuance of  a  letter of  credit  by the  bank  or financial
institution specified  in the  applicable Prospectus  Supplement. The  coverage,
amount and frequency of any reduction in coverage provided by a letter of credit
issued  with  respect to  a  Series of  Certificates will  be  set forth  in the
Prospectus Supplement relating to such Series.
 
                                       37
<PAGE>
    POOL INSURANCE POLICIES
 
    If so  specified  in the  Prospectus  Supplement  relating to  a  Series  of
Certificates,  the Seller will  obtain a pool insurance  policy for the Mortgage
Loans in the related Trust Estate. The pool insurance policy will cover any loss
(subject to the limitations described  in the applicable Prospectus  Supplement)
by reason of default to the extent a related Mortgage Loan is not covered by any
primary  mortgage insurance policy.  The amount and principal  terms of any such
coverage will be set forth in the Prospectus Supplement.
 
    SPECIAL HAZARD INSURANCE POLICIES
 
    If so specified in the applicable Prospectus Supplement, for each Series  of
Certificates  as to which a  pool insurance policy is  provided, the Seller will
also obtain a special  hazard insurance policy for  the related Trust Estate  in
the amount set forth in such Prospectus Supplement. The special hazard insurance
policy  will, subject to the limitations  described in the applicable Prospectus
Supplement, protect against  loss by  reason of damage  to Mortgaged  Properties
caused  by certain hazards not insured against under the standard form of hazard
insurance policy for the respective states in which the Mortgaged Properties are
located. The amount and principal terms of  any such coverage will be set  forth
in the Prospectus Supplement.
 
    MORTGAGOR BANKRUPTCY BOND
 
    If  so specified in  the applicable Prospectus  Supplement, losses resulting
from a  bankruptcy proceeding  relating to  a mortgagor  affecting the  Mortgage
Loans in a Trust Estate with respect to a Series of Certificates will be covered
under  a mortgagor bankruptcy bond (or any other instrument that will not result
in a downgrading of  the rating of  the Certificates of a  Series by the  Rating
Agency or Rating Agencies that rated such Series). Any mortgagor bankruptcy bond
or  such other  instrument will  provide for coverage  in an  amount meeting the
criteria of the Rating Agency or Rating Agencies rating the Certificates of  the
related  Series, which  amount will  be set  forth in  the applicable Prospectus
Supplement. The amount  and principal  terms of any  such coverage  will be  set
forth in the Prospectus Supplement.
 
    RESERVE FUND
 
    If  so specified in the applicable Prospectus Supplement, credit enhancement
with respect to a Series of Certificates may be provided by the establishment of
one or more reserve funds (each, a "Reserve Fund") for such Series.
 
    The Reserve Fund for a  Series may be funded (i)  by the deposit therein  of
cash,  U.S. Treasury securities or instruments evidencing ownership of principal
or interest payments thereon, letters  of credit, demand notes, certificates  of
deposit  or  a combination  thereof  in the  aggregate  amount specified  in the
applicable Prospectus Supplement, (ii) by the deposit therein from time to  time
of  certain amounts,  as specified in  the applicable  Prospectus Supplement, to
which the certain Classes of Certificates  would otherwise be entitled or  (iii)
in  such  other  manner  as  may  be  specified  in  the  applicable  Prospectus
Supplement.
 
    CROSS SUPPORT
 
    If  specified  in  the  applicable  Prospectus  Supplement,  the  beneficial
ownership of separate groups of Mortgage Loans included in a Trust Estate may be
evidenced  by separate Classes of Certificates. In such case, credit support may
be provided by a cross support feature which requires that distributions be made
with respect to certain Classes from mortgage loan payments that would otherwise
be distributed to  Subordinated Certificates evidencing  a beneficial  ownership
interest  in  other loan  groups within  the same  Trust Estate.  The applicable
Prospectus Supplement for a  Series that includes a  cross support feature  will
describe the specific operation of any such cross support feature.
 
                                       38
<PAGE>
                      PREPAYMENT AND YIELD CONSIDERATIONS
 
PASS-THROUGH RATES
 
    Any Class of Certificates of a Series may have a fixed Pass-Through Rate, or
a  Pass-Through  Rate which  varies based  on changes  in an  index or  based on
changes with respect  to the underlying  Mortgage Loans (such  as, for  example,
varying  on the basis of  changes in the weighted  average Net Mortgage Interest
Rate of the underlying Mortgage Loans).
 
    The Prospectus Supplement  for each Series  will specify the  range and  the
weighted average of the Mortgage Interest Rates and, if applicable, Net Mortgage
Interest  Rates for the Mortgage Loans underlying  such Series as of the Cut-Off
Date. If the Trust  Estate includes adjustable-rate  Mortgage Loans or  includes
Mortgage  Loans with different Net Mortgage Interest Rates, the weighted average
Net Mortgage Interest Rate may  vary from time to time  as set forth below.  See
"The  Trust Estates." The  Prospectus Supplement for a  Series will also specify
the initial weighted average Pass-Through Rate for each Class of Certificates of
such Series and will specify whether each such Pass-Through Rate is fixed or  is
variable.
 
    The  Net Mortgage Interest  Rate for any  adjustable-rate Mortgage Loan will
change with any  changes in  the index  specified in  the applicable  Prospectus
Supplement  on which such Mortgage Interest  Rate adjustments are based, subject
to any applicable periodic or aggregate  caps or floors on the related  Mortgage
Interest  Rate. The weighted average Net  Mortgage Interest Rate with respect to
any Series  may vary  due  to changes  in the  Net  Mortgage Interest  Rates  of
adjustable-rate  Mortgage Loans,  to the  timing of  the Mortgage  Interest Rate
readjustments of  such Mortgage  Loans  and to  different  rates of  payment  of
principal  of fixed or adjustable-rate Mortgage Loans bearing different Mortgage
Interest Rates.
 
SCHEDULED DELAYS IN DISTRIBUTIONS
 
    At the date of initial issuance  of the Certificates of each Series  offered
hereby, the initial purchasers of a Class of Certificates may be required to pay
accrued  interest at  the applicable Pass-Through  Rate for such  Class from the
Cut-Off Date for such Series  to, but not including,  the date of issuance.  The
effective yield to Certificateholders will be below the yield otherwise produced
by  the applicable Pass-Through  Rate because the  distribution of principal and
interest which is due on each Due Date  will not be made until the 25th day  (or
if  such 25th day is not a  business day, the business day immediately following
such 25th day) of the month in which  such Due Date occurs (or until such  other
Distribution Date specified in the applicable Prospectus Supplement).
 
EFFECT OF PRINCIPAL PREPAYMENTS
 
    When  a Mortgage Loan is prepaid in full, the mortgagor pays interest on the
amount prepaid only to  the date of prepayment  and not thereafter.  Liquidation
Proceeds  (as defined  herein) and amounts  received in  settlement of insurance
claims are  also likely  to include  interest only  to the  time of  payment  or
settlement.  When a  Mortgage Loan is  prepaid in  full or in  part, an interest
shortfall may result depending  on the timing of  the receipt of the  prepayment
and   the   timing   of   when  those   prepayments   are   passed   through  to
Certificateholders.  To  partially  mitigate   this  reduction  in  yield,   the
Underlying  Servicing Agreements relating to a Series may provide, to the extent
specified in the applicable Prospectus Supplement, that with respect to  certain
principal  prepayments received on or, the Master Servicer will be obligated, on
or before each Distribution Date,  to pay an amount equal  to the lesser of  (i)
the  aggregate  interest  shortfall  with  respect  to  such  Distribution  Date
resulting from principal prepayments in full by mortgagors and (ii) the  portion
of  the Master  Servicer's master  servicing compensation  for such Distribution
Date specified in the applicable  Prospectus Supplement. No comparable  interest
shortfall  coverage  will be  provided by  the Master  Servicer with  respect to
liquidations of any Mortgage Loans  or partial principal payments. Any  interest
shortfall  arising from prepayments not so  covered or from liquidations will be
covered  by  means  of   the  subordination  of   the  rights  of   Subordinated
Certificateholders or any other credit support arrangements.
 
                                       39
<PAGE>
    A  lower  rate of  principal prepayments  than anticipated  would negatively
affect the total return to  investors in any Certificates  of a Series that  are
offered  at a discount to their principal  amount and a higher rate of principal
prepayments than  anticipated  would  negatively  affect  the  total  return  to
investors in the Certificates of a Series that are offered at a premium to their
principal  amount.  The  yield  on  Certificates  that  are  entitled  solely or
disproportionately to distributions of principal or interest may be particularly
sensitive to prepayment rates, and further information with respect to yield  on
such Certificates will be included in the applicable Prospectus Supplement.
 
WEIGHTED AVERAGE LIFE OF CERTIFICATES
 
    The  Mortgage Loans may be prepaid in full  or in part at any time. Mortgage
Loan generally will not provide for a  prepayment penalty but may so provide  if
indicated  in  the  related  Prospectus Supplement.  Fixed  rate  Mortgage Loans
generally  will  contain  due-on-sale   clauses  permitting  the  mortgagee   to
accelerate  the maturities of the Mortgage  Loans upon conveyance of the related
Mortgaged Properties, and adjustable-rate  Mortgage Loans generally will  permit
creditworthy  borrowers  to  assume  the  then-outstanding  indebtedness  on the
Mortgage Loans.
 
    Prepayments on Mortgage Loans are commonly measured relative to a prepayment
standard or model. The Prospectus Supplement for each Series of Certificates may
describe one or  more such  prepayment standards  or models  and contain  tables
setting  forth the weighted average life of each Class and the percentage of the
original aggregate principal balance of each Class that would be outstanding  on
specified  Distribution  Dates  for  such Series  and  the  projected  yields to
maturity on  certain Classes  thereof, in  each case  based on  the  assumptions
stated  in such Prospectus Supplement, including assumptions that prepayments on
the Mortgage Loans are made at rates corresponding to various percentages of the
prepayment standard or model specified in such Prospectus Supplement.
 
    There is no  assurance that prepayment  of the Mortgage  Loans underlying  a
Series  of Certificates will conform to any  level of the prepayment standard or
model specified in the  applicable Prospectus Supplement.  A number of  factors,
including  but not limited  to homeowner mobility,  economic conditions, natural
disasters, changes in mortgagors' housing needs, job transfers, unemployment or,
in the  case  of  borrowers  relying  on  commission  income  and  self-employed
borrowers,  significant fluctuations  in income or  adverse economic conditions,
mortgagors' net equity in the  properties securing the mortgages, including  the
use  of second or "home  equity" mortgage loans by mortgagors  or the use of the
properties as second or vacation  homes, servicing decisions, enforceability  of
due-on-sale  clauses, mortgage market interest  rates, mortgage recording taxes,
competition among  mortgage loan  originators resulting  in reduced  refinancing
costs,  reduction in documentation requirements and willingness to accept higher
loan-to-value ratios,  and  the  availability  of  mortgage  funds,  may  affect
prepayment  experience. In general,  however, if prevailing  interest rates fall
below the  Mortgage Interest  Rates borne  by the  Mortgage Loans  underlying  a
Series  of Certificates, the prepayment rates  of such Mortgage Loans are likely
to be higher than if prevailing rates remain at or above the rates borne by such
Mortgage Loans. Conversely, if prevailing interest rates rise above the Mortgage
Interest Rates borne  by the Mortgage  Loans, the Mortgage  Loans are likely  to
experience  a lower prepayment rate than if  prevailing rates remain at or below
such  Mortgage  Interest  Rates.  However,  there  can  be  no  assurance   that
prepayments  will rise or fall  according to such changes  in interest rates. It
should be noted  that Certificates of  a Series  may evidence an  interest in  a
Trust Estate with different Mortgage Interest Rates. Accordingly, the prepayment
experience  of such Certificates will to some extent be a function of the mix of
interest rates of the Mortgage Loans.  In addition, the terms of the  Underlying
Servicing   Agreements  will  require  the   related  Servicer  to  enforce  any
due-on-sale clause  to the  extent it  has knowledge  of the  conveyance or  the
proposed  conveyance of  the underlying  Mortgaged Property;  provided, however,
that any enforcement action  that the Servicer  determines would jeopardize  any
recovery  under  any  related  primary mortgage  insurance  policy  will  not be
required and provided, further, that the  Servicer may permit the assumption  of
defaulted Mortgage Loans. See "Servicing of the Mortgage Loans -- Enforcement of
Due-on-Sale Clauses; Realization Upon Defaulted Mortgage
 
                                       40
<PAGE>
Loans"  and "Certain Legal Aspects of the Mortgage Loans -- Due-On-Sale Clauses"
for a description of certain provisions of each Pooling and Servicing  Agreement
and  certain legal developments that may affect the prepayment experience on the
Mortgage Loans.
 
    At the request of the mortgagor, a Servicer, including Norwest Mortgage, may
allow the refinancing of a  Mortgage Loan in any  Trust Estate serviced by  such
Servicer by accepting prepayments thereon and permitting a new loan secured by a
Mortgage  on the same property. Upon such  refinancing, the new loan will not be
included in the Trust Estate. A mortgagor may be legally entitled to require the
Servicer to allow such  a refinancing. Any such  refinancing will have the  same
effect  as a prepayment in  full of the related Mortgage  Loan. In this regard a
Servicer may,  from  time to  time,  implement programs  designed  to  encourage
refinancing  through  such Servicer,  including but  not  limited to  general or
targeted solicitations, or  the offering of  pre-approved applications,  reduced
origination fees or closing costs, or other financial incentives. A Servicer may
also encourage refinancing of defaulted Mortgage Loans, including Mortgage Loans
that would permit creditworthy borrowers to assume the outstanding indebtedness.
 
    The  Seller will  be obligated,  under certain  circumstances, to repurchase
certain of  the Mortgage  Loans. In  addition, if  specified in  the  applicable
Prospectus  Supplement, the Pooling and Servicing Agreement will permit, but not
require, the  Seller or  Master Servicer,  and the  terms of  certain  insurance
policies  relating to the  Mortgage Loans may permit  the applicable insurer, to
purchase any  Mortgage Loan  which  is in  default or  as  to which  default  is
reasonably  foreseeable. The proceeds of any such purchase or repurchase will be
deposited in the  related Certificate  Account and such  purchase or  repurchase
will  have the same effect as a prepayment in full of the related Mortgage Loan.
See "The Pooling and Servicing Agreement -- Assignment of Mortgage Loans to  the
Trustee"  and "  -- Optional  Purchases." In  addition, if  so specified  in the
applicable  Prospectus  Supplement,  the  Master  Servicer  or  another   person
identified  therein will have the option to purchase all, but not less than all,
of the Mortgage Loans in any Trust Estate under the limited conditions specified
in such  Prospectus Supplement.  For any  Series of  Certificates for  which  an
election  has been  made to treat  the Trust  Estate (or one  or more segregated
pools of assets  therein) as a  REMIC, any  such purchase or  repurchase may  be
effected  only pursuant to a "qualified liquidation," as defined in Code Section
860F(a)(4)(A). See "The Pooling and Servicing Agreement -- Termination; Optional
Purchase of Mortgage Loans."
 
                        SERVICING OF THE MORTGAGE LOANS
 
    The following  is  a summary  of  certain provisions  of  the forms  of  the
Underlying Servicing Agreement and the Pooling and Servicing Agreement that have
been  filed as exhibits  to the Registration Statement  of which this Prospectus
forms a part. The summaries  do not purport to be  complete and are subject  to,
and  are qualified in their  entirety by reference to,  all of the provisions of
the Pooling and Servicing Agreement and Underlying Servicing Agreements for each
Series of Certificates and the applicable Prospectus Supplement.
 
THE MASTER SERVICER
 
    The Master Servicer  with respect  to each  Series of  Certificates will  be
Norwest  Bank. See "Norwest Bank" above.  The Master Servicer generally will (a)
be responsible under each Pooling and Servicing Agreement for providing  general
administrative  services for  the Trust Estate  for any  such Series, including,
among other things, (i) for administering and supervising the performance by the
Servicers of their  duties and responsibilities  under the Underlying  Servicing
Agreements,  (ii)  oversight  of  payments  received  on  Mortgage  Loans, (iii)
monitoring the amounts on deposit in various trust accounts, (iv) calculation of
the amounts  payable  to  Certificateholders  on  each  Distribution  Date,  (v)
preparation  of periodic reports  to the Trustee  or the Certificateholders with
respect to the  foregoing matters,  (vi) preparation of  federal and  applicable
state  and local tax  and information returns; (vii)  preparation of reports, if
any,  required   under   the  Securities   and   Exchange  Act   of   1934,   as
 
                                       41
<PAGE>
amended  and  (viii)  performing  certain  of  the  servicing  obligations  of a
terminated Servicer as described  below under "--  The Servicers"; (b)  maintain
any  mortgage pool insurance  policy, mortgagor bankruptcy  bond, special hazard
insurance policy  or other  form of  credit support  that may  be required  with
respect  to any Series and (c) make advances of delinquent payments of principal
and interest on the Mortgage Loans to the limited extent described herein  under
the  heading "Servicing of  Mortgage Loans --  Periodic Advances and Limitations
Thereon," if such  amounts are not  advanced by a  Servicer (other than  Norwest
Mortgage).  The Master Servicer will also perform additional duties as described
in the applicable Pooling and Servicing  Agreement. The Master Servicer will  be
entitled  to receive a  portion of the  interest payments on  the Mortgage Loans
included in the  Trust Estate  for such  a Series to  cover its  fees as  Master
Servicer. The Master Servicer may subcontract with Norwest Mortgage or any other
entity  the obligations of  the Master Servicer under  any Pooling and Servicing
Agreement. The  Master  Servicer  will  remain primarily  liable  for  any  such
contractor's performance in accordance with the applicable Pooling and Servicing
Agreement.  The Master Servicer may be  released from its obligations in certain
circumstances. See "Certain Matters Regarding the Master Servicer."
 
    The Master Servicer will generally be required to pay all expenses  incurred
in  connection with the  administration of the  Trust Estate, including, without
limitation, fees or other amounts  payable pursuant to any applicable  agreement
for  the  provision  of  credit  enhancement  for  such  Series,  the  fees  and
disbursements of the  Trustee and  any custodian,  fees due  to the  independent
accountants  and expenses incurred in  connection with distributions and reports
to Certificateholders.  Certain of  these expenses  may be  reimbursable to  the
Master  Servicer pursuant to  the terms of the  applicable Pooling and Servicing
Agreement.
 
    Each Prospectus Supplement relating  to such a  Series of Certificates  will
contain  information concerning  recent delinquency,  foreclosure and  loan loss
experience on  the  mortgage  loans included  in  Norwest  Mortgage's  servicing
portfolio  which were  originated or  acquired by  Norwest Mortgage  for its own
account or  for  the  account  of its  affiliates  ("Program  Loans"),  and,  if
available,  on those  Program Loans  having payment  terms generally  similar to
those of the Mortgage Loans  in the related Trust  Estate. If the related  Trust
Estate  contains  PHMC Mortgage  Loans,  the related  Prospectus  Supplement may
contain information concerning  PHMC's delinquency, foreclosure  and loans  loss
experience  prior to  the PHMC  Acquisition. Norwest  Mortgage's total servicing
portfolio of Program  Loans as  of any date  may include  (and PHMC's  servicing
portfolio included) loans having a variety of payment characteristics, including
adjustable  rate mortgage loans and loans subject to subsidy agreements, and the
overall delinquency, foreclosure and loan  loss experience of the Program  Loans
(or  PHMC-serviced mortgage loans) taken as a  whole may differ from that of the
Mortgage Loans contained  in any given  Trust Estate and  from that of  mortgage
servicers generally.
 
THE SERVICERS
 
    For  each  Series,  Norwest Mortgage  and,  if specified  in  the applicable
Prospectus  Supplement,  one  or  more  other  Servicers  will  provide  certain
customary  servicing  functions  with  respect  to  Mortgage  Loans  pursuant to
separate servicing  agreements  ("Underlying  Servicing  Agreements")  with  the
Seller or an affiliate thereof. The rights of the Seller or such affiliate under
the  applicable Underlying Servicing Agreements in respect of the Mortgage Loans
included in the Trust Estate for any  such Series will be assigned (directly  or
indirectly)  to the Trustee  for such Series.  The Servicers may  be entitled to
withhold  their  Servicing  Fees  and  certain  other  fees  and  charges   from
remittances of payments received on Mortgage Loans serviced by them.
 
    Each  Servicer generally will be approved by  FNMA or FHLMC as a servicer of
mortgage loans  and must  be approved  by the  Master Servicer.  In  determining
whether to approve a Servicer, the Master Servicer will review the credit of the
Servicer,  including capitalization  ratios, liquidity,  profitability and other
similar items that  indicate financial  ability to perform  its obligations.  In
addition, the
 
                                       42
<PAGE>
Master  Servicer's  mortgage  servicing  personnel  will  review  the Servicer's
servicing record  and evaluate  the  ability of  the  Servicer to  conform  with
required  servicing procedures. Once a Servicer is approved, the Master Servicer
will continue to monitor on an annual basis the financial position and servicing
performance of the Servicer.
 
    The  duties  to  be  performed  by  each  Servicer  include  collection  and
remittance   of  principal  and   interest  payments  on   the  Mortgage  Loans,
administration of  mortgage escrow  accounts,  collection of  insurance  claims,
foreclosure  procedures, and, if  necessary, the advance of  funds to the extent
certain payments are not made by the  mortgagor and have not been determined  by
the  Servicer to be not recoverable under the applicable insurance policies with
respect to such Series, from proceeds  of liquidation of such Mortgage Loans  or
otherwise.  Each  Servicer  also  will  provide  such  accounting  and reporting
services as are  necessary to  enable the  Master Servicer  to provide  required
information  to the Trustee with  respect to the Mortgage  Loans included in the
Trust Estate for such Series. Each Servicer is entitled to a periodic  Servicing
Fee equal to a specified percentage of the outstanding principal balance of each
Mortgage  Loan  serviced  by  such  Servicer. With  the  consent  of  the Master
Servicer, any of  the servicing obligations  of a Servicer  may be delegated  to
another  person approved  by the Master  Servicer. In  addition, certain limited
duties of a Servicer may be delegated without consent.
 
    The Trustee, or if  so provided in the  applicable Servicing Agreement,  the
Master  Servicer, may  terminate a  Servicer who has  failed to  comply with its
covenants or breached  one of  its representations contained  in the  Underlying
Servicing  Agreement or  in certain other  circumstances. Upon  termination of a
Servicer by  the  Master  Servicer,  the Master  Servicer  will  assume  certain
servicing obligations of the terminated Servicer, or, at its option, may appoint
a  substitute Servicer acceptable to the  Trustee (which substitute Servicer may
be Norwest  Mortgage) to  assume  the servicing  obligations of  the  terminated
Servicer.  The Master Servicer's obligations to  act as a servicer following the
termination of an Underlying Servicing Agreement will not, however, require  the
Master  Servicer to (i) purchase a Mortgage Loan  from the Trust Estate due to a
breach by  such Servicer  of a  representation or  warranty in  respect of  such
Mortgage Loan or (ii) with respect to a default by Norwest Mortgage as Servicer,
advance payments of principal and interest on a delinquent Mortgage Loan.
 
PAYMENTS ON MORTGAGE LOANS
 
    The  Master Servicer will, as to  each Series of Certificates, establish and
maintain a separate trust account in  the name of the Trustee (the  "Certificate
Account").  Such  account may  be established  at Norwest  Bank or  an affiliate
thereof. Each  such account  must be  maintained with  a depository  institution
("Depository") either (i) whose long-term debt obligations (or, in the case of a
depository  institution  which  is  part of  a  holding  company  structure, the
long-term debt obligations of such parent  holding company) are, at the time  of
any  deposit therein rated in at least  one of the two highest rating categories
by each nationally  recognized statistical  rating organization  that rated  the
related  Series of  Certificates, or  (ii) that  is otherwise  acceptable to the
Rating Agency or Rating Agencies rating the Certificates of such Series and,  if
a  REMIC election has been  made, that would not  cause the related Trust Estate
(or one or  more segregated pools  of assets therein)  to fail to  qualify as  a
REMIC.  To the  extent that  the portion of  funds deposited  in the Certificate
Account at any time exceeds the  limit of insurance coverage established by  the
Federal  Deposit Insurance Corporation (the "FDIC"), such excess will be subject
to loss in the event of the  failure of the Depository. Such insurance  coverage
will  be based on the number of  holders of Certificates, rather than the number
of underlying mortgagors. Holders of  the Subordinated Certificates of a  Series
will  bear any such loss  up to the amount of  principal payments on the related
Mortgage Loans to which such holders are entitled.
 
    Pursuant to the applicable Underlying Servicing Agreements with respect to a
Series, each Servicer  will be required  to establish and  maintain one or  more
accounts  (collectively,  the  "Servicer  Custodial  Account")  into  which  the
Servicer will be  required to  deposit on a  daily basis  amounts received  with
respect to Mortgage Loans serviced by such Servicer included in the Trust Estate
for  such Series, as more fully described below. Each Servicer Custodial Account
must be a separate custodial account insured to the available limits by the FDIC
and limited  to funds  held with  respect  to a  particular Series,  unless  the
Underlying   Servicing  Agreement  specifies  that   a  Servicer  may  establish
 
                                       43
<PAGE>
an account  which  is  an  eligible account  meeting  the  requirements  of  the
applicable  Rating  Agencies (an  "Eligible Custodial  Account")  to serve  as a
unitary Servicer Custodial Account both for such Series and for other Series  of
Certificates  for which Norwest Bank is the  Master Servicer and having the same
financial institution acting as Trustee and to be maintained in the name of such
financial institution, in  its respective  capacities as Trustee  for each  such
Series.
 
    Each  Servicer will  be required to  deposit in the  Certificate Account for
each Series of Certificates on the date the Certificates are issued any  amounts
representing  scheduled payments of principal and interest on the Mortgage Loans
serviced by such Servicer due after the applicable Cut-Off Date but received  on
or  prior  thereto,  and  except  as specified  in  the  applicable  Pooling and
Servicing Agreement  or  Underlying Servicing  Agreement,  will deposit  in  the
Servicer  Custodial Account on receipt and,  thereafter, not later than the 24th
calendar day  of each  month or  such earlier  day as  may be  specified in  the
Underlying Servicing Agreement (the "Remittance Date"), will remit to the Master
Servicer  for deposit  in the  Certificate Account,  the following  payments and
collections received or made by such Servicer with respect to the Mortgage Loans
serviced by such Servicer subsequent to the applicable Cut-Off Date (other  than
(x)  payments due on or before the Cut-Off  Date and (y) amounts held for future
distribution):
 
           (i)
           all payments  on account  of  principal, including  prepayments,  and
           interest;
 
          (ii)
           all   amounts  received  by  the  Servicer  in  connection  with  the
           liquidation of  defaulted  Mortgage  Loans or  property  acquired  in
    respect  thereof, whether  through foreclosure sale  or otherwise, including
    payments in  connection  with defaulted  Mortgage  Loans received  from  the
    mortgagor  other than amounts required to  be paid to the mortgagor pursuant
    to the terms of  the applicable Mortgage Loan  or otherwise pursuant to  law
    ("Liquidation  Proceeds") less, to the extent permitted under the applicable
    Underlying Servicing  Agreement,  the amount  of  any expenses  incurred  in
    connection with the liquidation of such Mortgage Loans;
 
         (iii)
           all  proceeds received  by the  Servicer under  any title,  hazard or
           other insurance policy  covering any such  Mortgage Loan, other  than
    proceeds  to be applied to the restoration or repair of the property subject
    to the related Mortgage or released to the mortgagor in accordance with  the
    Underlying Servicing Agreement;
 
          (iv)
           all Periodic Advances made by the Servicer;
 
           (v)
           all  amounts withdrawn from Buy-Down Funds  or Subsidy Funds, if any,
           with respect to such Mortgage Loans, in accordance with the terms  of
    the respective agreements applicable thereto;
 
          (vi)
           all  proceeds  of any  such Mortgage  Loans  or property  acquired in
           respect thereof purchased or repurchased pursuant to the Pooling  and
    Servicing Agreement or the Underlying Servicing Agreement; and
 
         (vii)
           all  other amounts required  to be deposited  therein pursuant to the
           applicable  Pooling  and  Servicing   Agreement  or  the   Underlying
    Servicing Agreement.
 
    Notwithstanding  the foregoing, if at any time  the sums in (x) any Servicer
Custodial Account, other than any Eligible Custodial Account, exceed $100,000 or
(y) any such Servicer Custodial  Account, in certain circumstances, exceed  such
amount  less than $100,000 as shall have  been specified by the Master Servicer,
the Servicer will be  required within one business  day to withdraw such  excess
funds from such account and remit such amounts to the Certificate Account.
 
    Notwithstanding  the  foregoing,  each  Servicer will  be  entitled,  at its
election, either (a)  to withhold and  pay itself the  applicable Servicing  Fee
from  any payment or other recovery on account of interest as received and prior
to deposit  in  the Servicer  Custodial  Account or  (b)  to withdraw  from  the
Servicer Custodial Account the applicable Servicing Fee after the entire payment
or recovery has been deposited in such account.
 
                                       44
<PAGE>
    The  Master Servicer or Trustee will  deposit in the Certificate Account any
Periodic Advances made  by the  Master Servicer  or Trustee  in the  event of  a
Servicer  default not later than the Distribution Date on which such amounts are
required to  be  distributed.  All  other  amounts  will  be  deposited  in  the
Certificate  Account not later than  the business day next  following the day of
receipt and posting by the Master Servicer. On or before each Distribution Date,
the Master Servicer will withdraw from the Certificate Account and remit to  the
Trustee for distribution to Certificateholders all amounts allocable to the Pool
Distribution Amount for such Distribution Date.
 
    If  a  Servicer,  the  Master  Servicer  or  the  Trustee  deposits  in  the
Certificate Account  for  a Series  any  amount  not required  to  be  deposited
therein,  the Master  Servicer may  at any time  withdraw such  amount from such
account for  itself  or for  remittance  to such  Servicer  or the  Trustee,  as
applicable.  Funds  on deposit  in the  Certificate Account  may be  invested in
certain investments acceptable to  the Rating Agencies ("Eligible  Investments")
maturing  in  general  not  later  than  the  business  day  preceding  the next
Distribution Date. In  the event that  an election  has been made  to treat  the
Trust Estate (or one or more segregated pools of assets therein) with respect to
a Series as a REMIC, no such Eligible Investments will be sold or disposed of at
a  gain prior to maturity unless the  Master Servicer has received an opinion of
counsel or other evidence satisfactory to it that such sale or disposition  will
not  cause the Trust Estate (or segregated pool  of assets) to be subject to the
tax on "prohibited transactions" imposed  by Code Section 860F(a)(1),  otherwise
subject  the Trust Estate  (or segregated pool  of assets) to  tax, or cause the
Trust Estate (or any segregated  pool of assets) to fail  to qualify as a  REMIC
while  any  Certificates  of the  Series  are outstanding.  Except  as otherwise
specified in the applicable Prospectus Supplement, all income and gain  realized
from  any such  investment will  be for  the account  of the  Master Servicer as
additional compensation  and  all  losses  from  any  such  investment  will  be
deposited by the Master Servicer out of its own funds to the Certificate Account
immediately as realized.
 
    The  Master Servicer  is permitted, from  time to time,  to make withdrawals
from the Certificate Account for the following purposes, to the extent permitted
in the applicable Pooling and Servicing Agreement (and, in the case of  Servicer
reimbursements  by  the  Master  Servicer,  only  to  the  extent  funds  in the
respective Servicer Custodial Account are not sufficient therefor):
 
           (i)
           to reimburse the  Master Servicer,  the Trustee or  any Servicer  for
           Advances;
 
          (ii)
           to  reimburse any Servicer  for liquidation expenses  and for amounts
           expended by itself or any Servicer, as applicable, in connection with
    the restoration of damaged property;
 
         (iii)
           to pay to itself  the applicable Master Servicing  Fee and any  other
           amounts constituting additional master servicing compensation, to pay
    the  Trustee the applicable Trustee Fee, to  pay any other fees described in
    the applicable Prospectus Supplement;  and to pay to  the owner thereof  any
    Fixed Retained Yield;
 
          (iv)
           to  reimburse itself or any  Servicer for certain expenses (including
           taxes paid on behalf of the Trust Estate) incurred by and recoverable
    by or reimbursable to itself or the Servicer, as applicable;
 
           (v)
           to pay  to the  Seller, a  Servicer or  itself with  respect to  each
           Mortgage  Loan or property acquired in  respect thereof that has been
    repurchased by the Seller or purchased by a Servicer or the Master  Servicer
    all  amounts received thereon and not distributed as of the date as of which
    the purchase price of such Mortgage Loan was determined;
 
          (vi)
           to pay to itself any interest  earned on or investment income  earned
           with  respect to funds in the  Certificate Account (all such interest
    or income to be withdrawn not later than the next Distribution Date);
 
                                       45
<PAGE>
         (vii)
           to pay to itself, the Servicer  and the Trustee from net  Liquidation
           Proceeds  allocable  to interest,  the  amount of  any  unpaid Master
    Servicing Fee,  Servicing Fees  or Trustee  Fees and  any unpaid  assumption
    fees,  late  payment  charges  or other  mortgagor  charges  on  the related
    Mortgage Loan;
 
        (viii)
           to withdraw from the Certificate Account any amount deposited in such
           account that was not required to be deposited therein; and
 
          (ix)
           to clear and terminate the Certificate Account.
 
    The Master  Servicer will  be  authorized to  appoint  a paying  agent  (the
"Paying  Agent") to  make distributions,  as agent  for the  Master Servicer, to
Certificateholders of a Series. If the Paying Agent for a Series is the  Trustee
of  such Series, such Paying  Agent will be authorized  to make withdrawals from
the Certificate Account in order to make distributions to Certificateholders. If
the Paying Agent for  a Series is  not the Trustee for  such Series, the  Master
Servicer will, on each Distribution Date, deposit in immediately available funds
in  an account  designated by any  such Paying  Agent the amount  required to be
distributed to the Certificateholders on such Distribution Date.
 
    The Master Servicer will cause any Paying  Agent that is not the Trustee  to
execute  and deliver  to the  Trustee an instrument  in which  such Paying Agent
agrees with the Trustee that such Paying Agent will:
 
       (1) hold all  amounts  deposited  with  it by  the  Master  Servicer  for
           distribution  to  Certificateholders  in  trust  for  the  benefit of
    Certificateholders until such amounts are distributed to  Certificateholders
    or otherwise disposed of as provided in the applicable Pooling and Servicing
    Agreement;
 
       (2) give  the Trustee notice of any default by the Master Servicer in the
           making of such deposit; and
 
       (3) at any time during the continuance of any such default, upon  written
           request to the Trustee, forthwith pay to the Trustee all amounts held
    in trust by such Paying Agent.
 
PERIODIC ADVANCES AND LIMITATIONS THEREON
 
    Generally  each Servicer will  be required to make  (i) Periodic Advances to
cover delinquent payments of  principal and interest on  such Mortgage Loan  and
(ii)  other advances of  cash ("Other Advances"  and, collectively with Periodic
Advances, "Advances")  to  cover (x)  delinquent  payments of  taxes,  insurance
premiums,   and  other  escrowed  items  and  (y)  rehabilitation  expenses  and
foreclosure costs, including reasonable attorneys'  fees, in either case  unless
such  Servicer has determined that any subsequent payments on that Mortgage Loan
or from the borrower will ultimately not be available to reimburse such Servicer
for such amounts.  The failure  of the Servicer  to make  any required  Periodic
Advances or Other Advances under an Underlying Servicing Agreement constitutes a
default  under such  agreement for which  the Servicer will  be terminated. Upon
default by a Servicer, other than Norwest Mortgage, the Master Servicer may, and
upon default by Norwest Mortgage the Trustee may, in each case if so provided in
the Pooling and Servicing  Agreement, be required to  make Periodic Advances  to
the  extent necessary to make required  distributions on certain Certificates or
certain Other  Advances,  provided  that  the Master  Servicer  or  Trustee,  as
applicable,  determines that funds will ultimately be available to reimburse it.
In the  case of  Certificates of  any  Series for  which credit  enhancement  is
provided  in the form of a mortgage pool insurance policy, the Seller may obtain
an endorsement to the  mortgage pool insurance policy  which obligates the  Pool
Insurer  to  advance delinquent  payments of  principal  and interest.  The Pool
Insurer would  only  be obligated  under  such  endorsement to  the  extent  the
mortgagor fails to make such payment and the Master Servicer or Trustee fails to
make a required advance.
 
    The  advance obligation  of the Master  Servicer and Trustee  may be further
limited to an amount specified by the Rating Agency rating the Certificates. Any
such Periodic Advances by  the Servicers or the  Master Servicer or Trustee,  as
the   case   may   be,  must   be   deposited  into   the   applicable  Servicer
 
                                       46
<PAGE>
Custodial Account or the Certificate Account and  will be due no later than  the
business  day  before the  Distribution Date  to  which such  delinquent payment
relates. Advances by  the Servicers or  the Master Servicer  or Trustee, as  the
case  may  be, will  be reimbursable  out of  insurance proceeds  or Liquidation
Proceeds of, or,  except for Other  Advances, future payments  on, the  Mortgage
Loans  for which such amounts  were advanced. If an  Advance made by a Servicer,
the Master Servicer  or the Trustee  later proves,  or is deemed  by the  Master
Servicer or the Trustee, to be unrecoverable, such Servicer, the Master Servicer
or the Trustee, as the case may be, will be entitled to reimbursement from funds
in  the  Certificate  Account  prior  to the  distribution  of  payments  to the
Certificateholders  to  the  extent  provided  in  the  Pooling  and   Servicing
Agreement.
 
    Any Periodic Advances made by a Servicer, the Master Servicer or the Trustee
with  respect to Mortgage Loans included in  the Trust Estate for any Series are
intended to  enable  the  Trustee  to  make  timely  payment  of  the  scheduled
distributions  of principal  and interest  on the  Certificates of  such Series.
However, neither the Master  Servicer, the Trustee, any  Servicer nor any  other
person  will,  except  as  otherwise  specified  in  the  applicable  Prospectus
Supplement, insure or guarantee the Certificates  of any Series or the  Mortgage
Loans included in the Trust Estate for any Certificates.
 
COLLECTION AND OTHER SERVICING PROCEDURES
 
    Each Servicer will be required by the related Underlying Servicing Agreement
to make reasonable efforts to collect all payments called for under the Mortgage
Loans and, consistent with the applicable Underlying Servicing Agreement and any
applicable  agreement governing any  form of credit  enhancement, to follow such
collection procedures as it follows with  respect to mortgage loans serviced  by
it  that are comparable  to the Mortgage  Loans. Consistent with  the above, the
Servicer may, in  its discretion,  (i) waive any  prepayment charge,  assumption
fee,  late payment charge or any other  charge in connection with the prepayment
of a  Mortgage  Loan and  (ii)  arrange with  a  mortgagor a  schedule  for  the
liquidation  of deficiencies running for not more  than 180 days (or such longer
period to which the Master Servicer  and any applicable Pool Insurer or  primary
mortgage insurer have consented) after the applicable Due Date.
 
    Under  each  Underlying Servicing  Agreement, each  Servicer, to  the extent
permitted by law, will establish and maintain one or more escrow accounts  (each
such  account,  a  "Servicing Account")  in  which  each such  Servicer  will be
required to  deposit any  payments  made by  mortgagors  in advance  for  taxes,
assessments,  primary mortgage (if applicable) and hazard insurance premiums and
other similar  items. Withdrawals  from the  Servicing Account  may be  made  to
effect  timely payment of taxes, assessments,  mortgage and hazard insurance, to
refund to  mortgagors amounts  determined to  be overages,  to pay  interest  to
mortgagors  on balances in the Servicing Account,  if required, and to clear and
terminate such account. Each Servicer will be responsible for the administration
of its  Servicing Account.  A  Servicer will  be  obligated to  advance  certain
amounts  which are  not timely  paid by  the mortgagors,  to the  extent that it
determines, in  good faith,  that  they will  be  recoverable out  of  insurance
proceeds,   liquidation  proceeds,  or  otherwise.  Alternatively,  in  lieu  of
establishing a Servicing Account, a Servicer  may procure a performance bond  or
other form of insurance coverage, in an amount acceptable to the Master Servicer
and  each Rating Agency rating the related Series of Certificates, covering loss
occasioned by the failure to escrow such amounts.
 
ENFORCEMENT OF DUE-ON-SALE CLAUSES; REALIZATION UPON DEFAULTED MORTGAGE LOANS
 
    With respect  to  each Mortgage  Loan  having  a fixed  interest  rate,  the
applicable  Underlying Servicing Agreement will generally provide that, when any
Mortgaged Property is about to be conveyed by the mortgagor, the Servicer  will,
to  the extent  it has  knowledge of  such prospective  conveyance, exercise its
rights to accelerate the maturity of such Mortgage Loan under the  "due-on-sale"
clause applicable thereto, if any, unless it is not exercisable under applicable
law  or if such exercise would result in loss of insurance coverage with respect
to such Mortgage Loan or would, in the Servicer's judgment, be reasonably likely
to result in litigation by the mortgagor and such Servicer has not obtained  the
Master  Servicer's consent  to such  exercise. In  either case,  the Servicer is
authorized to take or enter into  an assumption and modification agreement  from
or with the person to whom such
 
                                       47
<PAGE>
Mortgaged  Property has been or is about  to be conveyed, pursuant to which such
person becomes  liable  under  the  Mortgage  Note  and,  unless  prohibited  by
applicable  state law, the  mortgagor remains liable  thereon, provided that the
Mortgage Loan will continue to be covered  by any pool insurance policy and  any
related  primary mortgage insurance  policy and the  Mortgage Interest Rate with
respect to such Mortgage Loan and the payment terms shall remain unchanged.  The
Servicer  will also be authorized,  with the prior approval  of the pool insurer
and the  primary mortgage  insurer, if  any,  to enter  into a  substitution  of
liability  agreement with such person, pursuant  to which the original mortgagor
is released  from liability  and such  person is  substituted as  mortgagor  and
becomes liable under the Mortgage Note.
 
    Each Underlying Servicing Agreement and Pooling and Servicing Agreement with
respect  to a Series  will require the  Servicer or the  Master Servicer, as the
case may  be,  to present  claims  to the  insurer  under any  insurance  policy
applicable  to the Mortgage Loans  included in the Trust  Estate for such Series
and to take such reasonable steps as are necessary to permit recovery under such
insurance policies with respect  to defaulted Mortgage Loans,  or losses on  the
Mortgaged Property securing the Mortgage Loans.
 
    Each  Servicer  is  obligated  under  the  applicable  Underlying  Servicing
Agreement for each Series to realize upon defaulted Mortgage Loans in accordance
with its normal servicing  practices, which will conform  generally to those  of
prudent  mortgage lending institutions which service  mortgage loans of the same
type in the same jurisdictions.  Notwithstanding the foregoing, the Servicer  is
authorized  under the  applicable Underlying  Servicing Agreement  to permit the
assumption of a  defaulted Mortgage Loan  rather than to  foreclose or accept  a
deed-in-lieu  of  foreclosure if,  in the  Servicer's  judgment, the  default is
unlikely to  be  cured  and  the  assuming  borrower  meets  Norwest  Mortgage's
applicable  underwriting guidelines. In connection with any such assumption, the
Mortgage Interest Rate and the payment  terms of the related Mortgage Note  will
not be changed. Each Servicer may also, with the consent of the Master Servicer,
modify  the payment terms of Mortgage Loans that  are in default, or as to which
default is reasonably foreseeable, that remain  in the Trust Estate rather  than
foreclose  on  such Mortgage  Loans; provided  that  no such  modification shall
forgive principal  owing under  such  Mortgage Loan  or permanently  reduce  the
interest  rate on such  Mortgage Loan. Any  such modification will  be made only
upon the  determination  by the  Servicer  and  the Master  Servicer  that  such
modification  is likely to increase the proceeds  of such Mortgage Loan over the
amount expected to be collected pursuant  to foreclosure. See also "The  Pooling
and  Servicing  Agreement --  Optional Purchases,"  above,  with respect  to the
Seller's right to repurchase Mortgage Loans that are in default, or as to  which
default  is  reasonably  foreseeable.  Further,  a  Servicer  may  encourage the
refinancing of  such defaulted  Mortgage Loans,  including Mortgage  Loans  that
would permit creditworthy borrowers to assume the outstanding indebtedness.
 
    In  the case  of foreclosure or  of damage  to a Mortgaged  Property from an
uninsured cause, the Servicer will  not be required to  expend its own funds  to
foreclose  or restore any damaged property,  unless it reasonably determines (i)
that  such   foreclosure  or   restoration  will   increase  the   proceeds   to
Certificateholders  of such  Series of  liquidation of  the Mortgage  Loan after
reimbursement to  the related  Servicer  for its  expenses  and (ii)  that  such
expenses  will  be  recoverable  to  it  through  Liquidation  Proceeds  or  any
applicable insurance policy in respect of such Mortgage Loan. In the event  that
Servicer  has  expended its  own  funds for  foreclosure  or to  restore damaged
property, it will be entitled to be reimbursed from the Certificate Account  for
such Series an amount equal to all costs and expenses incurred by it.
 
    Norwest  Mortgage will not be obligated to,  and any other Servicer will not
(except with the express written approval of the Master Servicer), foreclose  on
any Mortgaged Property which it believes may be contaminated with or affected by
hazardous  wastes or  hazardous substances.  See "Certain  Legal Aspects  of the
Mortgage  Loans  --  Environmental  Considerations."  If  a  Servicer  does  not
foreclose  on a Mortgaged Property, the Certificateholders of the related Series
may experience a  loss on  the related  Mortgage Loan.  A Servicer  will not  be
liable  to  the  Certificateholders if  it  fails  to foreclose  on  a Mortgaged
Property which it  believes may  be so contaminated  or affected,  even if  such
 
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<PAGE>
Mortgaged  Property is, in fact, not  so contaminated or affected. Conversely, a
Servicer will not be  liable to the Certificateholders  if, based on its  belief
that  no  such contamination  or  effect exists,  the  Servicer forecloses  on a
Mortgaged Property and takes  title to such  Mortgaged Property, and  thereafter
such Mortgaged Property is determined to be so contaminated or affected.
 
    The  Servicer may foreclose  against property securing  a defaulted Mortgage
Loan either by foreclosure, by sale or by strict foreclosure and in the event  a
deficiency  judgment is  available against  the mortgagor  or other  person (see
"Certain Legal Aspects of the Mortgage Loans -- Anti-Deficiency Legislation  and
Other Limitations on Lenders" for a discussion of the availability of deficiency
judgments), may proceed for the deficiency. It is anticipated that in most cases
the  Servicer will not seek deficiency judgments, and will not be required under
the applicable Underlying Servicing Agreement  to seek deficiency judgments.  In
lieu  of foreclosure, each Servicer may arrange  for the sale by the borrower of
the Mortgaged Property related  to a defaulted Mortgage  Loan to a third  party,
rather than foreclosing upon and selling such Mortgaged Property.
 
    With respect to a Trust Estate (or any segregated pool of assets therein) as
to  which a REMIC election  has been made, if  the Trustee acquires ownership of
any Mortgaged  Property as  a  result of  a  default or  reasonably  foreseeable
default  of any Mortgage Loan secured by such Mortgaged Property, the Trustee or
Master Servicer will be  required to dispose of  such property within two  years
following its acquisition by the Trust Estate unless the Trustee (a) receives an
opinion  of counsel to the effect that  the holding of the Mortgaged Property by
the Trust Estate will  not cause the Trust  Estate to be subject  to the tax  on
"prohibited  transactions" imposed by Code Section 860F(a)(1) or cause the Trust
Estate (or any segregated pool of assets  therein as to which one or more  REMIC
elections  have been made or will be made) to  fail to qualify as a REMIC or (b)
applies for and is  granted an extension  of the two-year  period in the  manner
contemplated  by Code Section  856(e)(3). The Servicer also  will be required to
administer the Mortgaged Property in a manner which does not cause the Mortgaged
Property to fail to qualify as "foreclosure property" within the meaning of Code
Section 860G(a)(8) or  result in the  receipt by  the Trust Estate  of any  "net
income from foreclosure property" within the meaning of Code Section 860G(c)(2),
respectively.  In  general, this  would preclude  the  holding of  the Mortgaged
Property by a party acting as a dealer in such property or the receipt of rental
income based on the profits of the lessee of such property. See "Certain Federal
Income Tax Consequences."
 
INSURANCE POLICIES
 
    Each Underlying Servicing  Agreement will  require the  related Servicer  to
cause to be maintained for each Mortgage Loan a standard hazard insurance policy
issued  by  a  generally acceptable  insurer  insuring the  improvements  on the
Mortgaged Property  underlying such  Mortgage Loan  against loss  by fire,  with
extended  coverage  (a  "Standard  Hazard  Insurance  Policy").  The  Underlying
Servicing Agreements will require that such Standard Hazard Insurance Policy  be
in  an amount at least equal to the lesser of 100% of the insurable value of the
improvements on the Mortgaged Property or the principal balance of such Mortgage
Loan; provided, however, that  such insurance may not  be less than the  minimum
amount required to fully compensate for any damage or loss on a replacement cost
basis.  Each Servicer will also maintain  on property acquired upon foreclosure,
or deed  in  lieu  of foreclosure,  of  any  Mortgage Loan,  a  Standard  Hazard
Insurance  Policy in an amount that  is at least equal to  the lesser of 100% of
the insurable value of the improvements which are a part of such property or the
principal balance of such  Mortgage Loan plus  accrued interest and  liquidation
expenses;  provided,  however, that  such  insurance may  not  be less  than the
minimum amount  required  to  fully compensate  for  any  damage or  loss  on  a
replacement  cost basis.  Any amounts collected  under any  such policies (other
than amounts  to  be applied  to  the restoration  or  repair of  the  Mortgaged
Property  or  released  to  the borrower  in  accordance  with  normal servicing
procedures) will be deposited in  the Servicer Custodial Account for  remittance
to the Certificate Account by a Servicer.
 
    The Standard Hazard Insurance Policies covering the Mortgage Loans generally
will  cover  physical damage  to,  or destruction  of,  the improvements  on the
Mortgaged Property caused by fire, lightning, explosion, smoke, windstorm, hail,
riot, strike  and civil  commotion,  subject to  the conditions  and  exclusions
particularized  in each policy.  Because the Standard  Hazard Insurance Policies
 
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<PAGE>
relating to such Mortgage Loans will  be underwritten by different insurers  and
will  cover Mortgaged Properties  located in various  states, such policies will
not contain identical terms and conditions. The most significant terms  thereof,
however,  generally  will  be determined  by  state  law and  generally  will be
similar. Most  such  policies  typically  will not  cover  any  physical  damage
resulting  from the following: war, revolution, governmental actions, floods and
other water-related causes,  earth movement  (including earthquakes,  landslides
and  mudflows), nuclear  reaction, wet or  dry rot, vermin,  rodents, insects or
domestic animals,  hazardous  wastes  or hazardous  substances,  theft  and,  in
certain  cases, vandalism.  The foregoing list  is merely  indicative of certain
kinds of uninsured risks and is not all-inclusive.
 
    In general, if the  improvements on a Mortgaged  Property are located in  an
area  identified in  the Federal  Register by  the Federal  Emergency Management
Agency as having special flood hazards  (and such flood insurance has been  made
available) each Underlying Servicing Agreement will require the related Servicer
to  cause to be maintained a flood  insurance policy meeting the requirements of
the current guidelines of the Federal Insurance Administration with a  generally
acceptable insurance carrier. Generally, the Underlying Servicing Agreement will
require that such flood insurance be in an amount not less than the least of (i)
the  outstanding principal balance of the Mortgage Loan, (ii) the full insurable
value of the  improvements, or (iii)  the maximum amount  of insurance which  is
available  under the Flood Disaster Protection  Act of 1973, as amended. Norwest
Mortgage does  not  provide  financing  for flood  zone  properties  located  in
communities  not participating  in the  National Flood  Insurance Program  or if
available insurance coverage is, in its judgment, unrealistically low.
 
    Each Servicer may maintain a  blanket policy insuring against hazard  losses
on  all of the Mortgaged Properties in lieu of maintaining the required Standard
Hazard Insurance Policies  and may  maintain a blanket  policy insuring  against
special  hazards  in  lieu of  maintaining  any required  flood  insurance. Each
Servicer will be liable for the amount of any deductible under a blanket  policy
if  such amount would have been covered  by a required Standard Hazard Insurance
Policy or flood insurance, had it been maintained.
 
    Any losses incurred with  respect to Mortgage Loans  due to uninsured  risks
(including  earthquakes,  mudflows,  floods and  hazardous  wastes  or hazardous
substances) or  insufficient hazard  insurance  proceeds will  adversely  affect
distributions to the Certificateholders.
 
FIXED RETAINED YIELD, SERVICING COMPENSATION AND PAYMENT OF EXPENSES
 
    Fixed  Retained Yield with respect to any  Mortgage Loan is that portion, if
any, of interest  at the  Mortgage Interest  Rate that  is not  included in  the
related  Trust  Estate.  The Prospectus  Supplement  for a  Series  will specify
whether there is any Fixed Retained Yield with respect to the Mortgage Loans  of
such  Series.  If  so,  the  Fixed  Retained  Yield  will  be  established  on a
loan-by-loan basis  and will  be specified  in the  schedule of  Mortgage  Loans
attached  as  an  exhibit to  the  applicable Pooling  and  Servicing Agreement.
Norwest Mortgage as Servicer may deduct the Fixed Retained Yield from  mortgagor
payments  as received  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
 
                                       50
<PAGE>
(b) withdrawing the Servicing Fee from the Servicer Custodial Account after  the
entire  interest payment has been deposited in such account. A Servicer may also
pay itself  out  of  the  Liquidation  Proceeds of  a  Mortgage  Loan  or  other
recoveries with respect thereto, or withdraw from the Servicer Custodial Account
or  request the  Master Servicer  to withdraw  from the  Certificate Account for
remittance to  the Servicer  such  amounts after  the  deposit thereof  in  such
accounts,  or if such Liquidation Proceeds or other recoveries are insufficient,
from Net Foreclosure Profits with respect  to the related Distribution Date  the
Servicing  Fee in respect  of such Mortgage  Loan to the  extent provided in the
applicable Pooling and Servicing  Agreement. The Servicing Fee  or the range  of
Servicing Fees with respect to the Mortgage Loans underlying the Certificates of
a  Series will be specified in  the applicable Prospectus Supplement. Additional
servicing compensation in the form of prepayment charges, assumption fees,  late
payment charges or otherwise will be retained by the Servicers.
 
    Each  Servicer  will  pay  all  expenses  incurred  in  connection  with the
servicing of the Mortgage Loans serviced  by such Servicer underlying a  Series,
including,  without limitation, payment of the hazard insurance policy premiums.
The Servicer will be entitled,  in certain circumstances, to reimbursement  from
the  Certificate Account of Periodic  Advances, of Other Advances  made by it to
pay taxes, insurance premiums  and similar items with  respect to any  Mortgaged
Property  or for expenditures incurred by it in connection with the restoration,
foreclosure  or  liquidation  of  any  Mortgaged  Property  (to  the  extent  of
Liquidation  Proceeds or insurance policy proceeds  in respect of such Mortgaged
Property) and of  certain losses against  which it is  indemnified by the  Trust
Estate.
 
    As  set forth  in the  preceding paragraph,  a Servicer  may be  entitled to
reimbursement for certain  expenses incurred  by it, and  payment of  additional
fees  for certain extraordinary services rendered by it (provided that such fees
do not  exceed  those  which would  be  charged  by third  parties  for  similar
services)  in connection  with the liquidation  of defaulted  Mortgage Loans and
related Mortgaged Properties. In  the event that claims  are either not made  or
are  not fully paid from any applicable  form of credit enhancement, the related
Trust Estate will suffer a loss  to the extent that Liquidation Proceeds,  after
reimbursement  of the Servicing Fee  and the expenses of  the Servicer, are less
than the principal balance of the related Mortgage Loan.
 
EVIDENCE AS TO COMPLIANCE
 
    Each Servicer will deliver  annually to the Trustee  or Master Servicer,  as
applicable,  on  or  before  the date  specified  in  the  applicable Underlying
Servicing Agreement, an Officer's Certificate stating  that (i) a review of  the
activities   of  such  Servicer  during  the  preceding  calendar  year  and  of
performance under the  applicable Underlying Servicing  Agreement has been  made
under  the supervision of such  officer, and (ii) to  the best of such officer's
knowledge, based on such review, such Servicer has fulfilled all its obligations
under the applicable Underlying Servicing Agreement throughout such year, or, if
there has been a default in  the fulfillment of any such obligation,  specifying
each  such default known to such officer and the nature and status thereof. Such
Officer's Certificate  shall  be  accompanied  by  a  statement  of  a  firm  of
independent  public  accountants  to  the  effect  that,  on  the  basis  of  an
examination of certain documents and records relating to a random sample of  the
mortgage  loans  being serviced  by such  Servicer  pursuant to  such Underlying
Servicing Agreement and/or other similar agreements, conducted substantially  in
compliance  with  the Uniform  Single Audit  Program  for Mortgage  Bankers, the
servicing of such mortgage loans was conducted in compliance with the provisions
of the applicable Underlying Servicing  Agreement and other similar  agreements,
except  for (i) such exceptions as such  firm believes to be immaterial and (ii)
such other exceptions as are set forth in such statement.
 
    The Master Servicer will deliver annually  to the Trustee, on or before  the
date  specified in the applicable Pooling  and Servicing Agreement, an Officer's
Certificate stating  that  such  officer  has received,  with  respect  to  each
Servicer,  the Officer's Certificate and accountant's statement described in the
preceding paragraph, and,  that on the  basis of such  officer's review of  such
information, each
 
                                       51
<PAGE>
Servicer  has  fulfilled all  its  obligations under  the  applicable Underlying
Servicing Agreement throughout such year, or, if there has been a default in the
fulfillment of any such obligation, specifying  each such default known to  such
officer and the nature and status thereof.
 
                 CERTAIN MATTERS REGARDING THE MASTER SERVICER
 
    The Master Servicer may not resign from its obligations and duties under the
Pooling  and  Servicing Agreement  for each  Series without  the consent  of the
Trustee, except upon its determination that its duties thereunder are no  longer
permissible  under  applicable law  or  are in  material  conflict by  reason of
applicable law with any other activities of a type and nature carried on by  it.
No such resignation will become effective until the Trustee for such Series or a
successor  master  servicer has  assumed the  Master Servicer's  obligations and
duties under the Pooling and Servicing Agreement. If the Master Servicer resigns
for any of  the foregoing  reasons and  the Trustee  is unable  or unwilling  to
assume  responsibility for its duties under the Pooling and Servicing Agreement,
it may appoint another institution to so act as described under "The Pooling and
Servicing Agreement -- Rights Upon Event of Default" below.
 
    The Pooling  and Servicing  Agreement  will also  provide that  neither  the
Master  Servicer  nor any  subcontractor,  nor any  partner,  director, officer,
employee or agent  of any  of them,  will be under  any liability  to the  Trust
Estate or the Certificateholders, for the taking of any action or for refraining
from  the  taking  of any  action  in good  faith  pursuant to  the  Pooling and
Servicing Agreement, or for errors in judgment; provided, however, that  neither
the  Master Servicer, any  subcontractor, nor any such  person will be protected
against any  liability that  would otherwise  be imposed  by reason  of  willful
misfeasance,  bad faith  or gross  negligence in the  performance of  his or its
duties or by reason of reckless disregard  of his or its obligations and  duties
thereunder.  The Pooling and  Servicing Agreement will  further provide that the
Master Servicer, any subcontractor, and any partner, director, officer, employee
or agent of either  of them shall  be entitled to  indemnification by the  Trust
Estate and will be held harmless against any loss, liability or expense incurred
in  connection  with any  legal  action relating  to  the Pooling  and Servicing
Agreement or  the  Certificates,  other  than any  loss,  liability  or  expense
incurred  by reason of willful misfeasance, bad faith or gross negligence in the
performance of his or its duties  thereunder or by reason of reckless  disregard
of  his or its obligations  and duties thereunder. In  addition, the Pooling and
Servicing Agreement will provide that the Master Servicer will not be under  any
obligation  to  appear in,  prosecute or  defend  any legal  action that  is not
incidental to its duties under the  Pooling and Servicing Agreement and that  in
its opinion may involve it in any expense or liability. The Master Servicer may,
however,  in its discretion, undertake any such action deemed by it necessary or
desirable with respect to the Pooling and Servicing Agreement and the rights and
duties of  the  parties thereto  and  the interests  of  the  Certificateholders
thereunder.  In such event, the legal expenses  and costs of such action and any
liability resulting therefrom  will be  expenses, costs and  liabilities of  the
Trust  Estate and the Master Servicer will be entitled to be reimbursed therefor
out of the Certificate Account,  and any loss to  the Trust Estate arising  from
such  right  of  reimbursement  will  be  allocated  first  to  the Subordinated
Certificate  of  a  Series  before   being  allocated  to  the  related   Senior
Certificates,  or if such Series does not contain Subordinated Certificates, pro
rata among the various Classes of Certificates unless otherwise specified in the
applicable Pooling and Servicing Agreement.
 
    Any person into which the Master Servicer may be merged or consolidated,  or
any  person resulting from any merger,  conversion or consolidation to which the
Master Servicer is a party, or any person succeeding to the business through the
transfer of  substantially all  of its  assets or  all assets  relating to  such
business,  or otherwise,  of the  Master Servicer will  be the  successor of the
Master Servicer  under  the Pooling  and  Servicing Agreement  for  each  Series
provided  that such successor  or resulting entity  has a net  worth of not less
than $15,000,000 and is qualified to service mortgage loans for FNMA or FHLMC.
 
    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
 
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<PAGE>
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  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
 
                                       53
<PAGE>
will be delivered promptly upon receipt. The assignment of each Mortgage will be
recorded promptly after  the initial  issuance of Certificates  for the  related
Trust  Estate, except in states  where, in the opinion  of counsel acceptable to
the Trustee, such recording is not required to protect the Trustee's interest in
the Mortgage  Loan  against  the  claim of  any  subsequent  transferee  or  any
successor  to or creditor of  the Seller, Norwest Mortgage  or the originator of
such Mortgage Loan.
 
    The Trustee or custodian will hold  such documents in trust for the  benefit
of  Certificateholders  of the  related Series  and  will review  such documents
within 180 days of the date  of the applicable Pooling and Servicing  Agreement.
If  any document is  not delivered or is  found to be  defective in any material
respect, or  if the  Seller  is in  breach of  any  of its  representations  and
warranties,  and such breach  materially and adversely  affects the interests of
the Certificateholders in a  Mortgage Loan, and the  Seller cannot deliver  such
document  or cure  such defect  or breach  within 60  days after  written notice
thereof, the Seller will, within 60  days of such notice, either repurchase  the
related  Mortgage Loan  from the  Trustee at  a price  equal to  the then unpaid
principal balance thereof, plus  accrued and unpaid  interest at the  applicable
Mortgage  Interest Rate (minus any Fixed Retained Yield) through the last day of
the month in which such repurchase takes place, or (in the case of a Series  for
which  one or more REMIC elections have been or will be made, unless the maximum
period as  may  be  provided  by  the Code  or  applicable  regulations  of  the
Department of the Treasury ("Treasury Regulations") shall have elapsed since the
execution of the applicable Pooling and Servicing Agreement) substitute for such
Mortgage  Loan  a  new  mortgage  loan  having  characteristics  such  that  the
representations and warranties  of the  Seller made pursuant  to the  applicable
Pooling and Servicing Agreement (except for representations and warranties as to
the  correctness of  the applicable schedule  of mortgage loans)  would not have
been incorrect  had such  substitute Mortgage  Loan originally  been a  Mortgage
Loan.  In the case  of a repurchased  Mortgage Loan, the  purchase price will be
deposited by the Seller  in the related  Certificate Account. In  the case of  a
substitute  Mortgage Loan, the mortgage file  relating thereto will be delivered
to the Trustee or the custodian and  the Seller will deposit in the  Certificate
Account,  an amount equal to  the excess of (i)  the unpaid principal balance of
the Mortgage  Loan which  is substituted  for, over  (ii) the  unpaid  principal
balance  of the substitute Mortgage Loan,  together with interest on such excess
at the  Mortgage Interest  Rate (minus  any Fixed  Retained Yield)  to the  next
scheduled  Due Date of the  Mortgage Loan which is  being substituted for. In no
event will any substitute Mortgage Loan have an unpaid principal balance greater
than  the  scheduled  principal  balance  calculated  in  accordance  with   the
amortization  schedule (the "Scheduled Principal  Balance") of the Mortgage Loan
for which it  is substituted  (after giving  effect to  the scheduled  principal
payment  due in the month of substitution on the Mortgage Loan substituted for),
or a term greater than, a Mortgage Interest Rate less than, a Mortgage  Interest
Rate  more than  one percent  per annum  greater than  or a  Loan-to-Value Ratio
greater than, the Mortgage Loan for which it is substituted. If substitution  is
to  be made for an  adjustable rate Mortgage Loan,  the substitute Mortgage Loan
will have an unpaid  principal balance no greater  than the Scheduled  Principal
Balance of the Mortgage Loan for which it is substituted (after giving effect to
the scheduled principal payment due in the month of substitution on the Mortgage
Loan  substituted  for), a  Loan-to-Value Ratio  less  than or  equal to,  and a
Mortgage Interest Rate at least equal to, that of the Mortgage Loan for which it
is substituted,  and will  bear interest  based on  the same  index, margin  and
frequency  of  adjustment  as  the  substituted  Mortgage  Loan.  The repurchase
obligation and the mortgage substitution  referred to above will constitute  the
sole remedies available to the Certificateholders or the Trustee with respect to
missing  or defective  documents or breach  of the  Seller's representations and
warranties.
 
    If no custodian is named in the Pooling and Servicing Agreement, the Trustee
will be  authorized  to  appoint  a custodian  to  maintain  possession  of  the
documents  relating to  the Mortgage  Loans and  to conduct  the review  of such
documents described above. Any custodian so appointed will keep and review  such
documents as the Trustee's agent under a custodial agreement.
 
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
 
                                       54
<PAGE>
which default  is reasonably  foreseeable  if, in  the  Seller's or  the  Master
Servicer's  judgment,  the related  default is  not  likely to  be cured  by the
borrower or default is not likely to be averted, at a price equal to the  unpaid
principal balance thereof plus accrued interest thereon and under the conditions
set forth in the applicable Prospectus Supplement.
 
REPORTS TO CERTIFICATEHOLDERS
 
    Unless  otherwise specified or modified in the related Pooling and Servicing
Agreement for each Series, the Master Servicer will prepare and the Trustee will
include with each distribution to Certificateholders of record of such Series  a
statement setting forth the following information, if applicable:
 
           (i)
           the amount of such distribution allocable to principal of the related
           Mortgage  Loans, separately  identifying the aggregate  amount of any
    principal prepayments  included therein,  the  amount of  such  distribution
    allocable to interest on the related Mortgage Loans and the aggregate unpaid
    principal balance of the Mortgage Loans evidenced by each Class after giving
    effect to the principal distributions on such Distribution Date;
 
          (ii)
           the  amount  of servicing  compensation with  respect to  the related
           Trust Estate and such other  customary information as is required  to
    enable Certificateholders to prepare their tax returns;
 
         (iii)
           the  amount by which  the Servicing Fee  for the related Distribution
           Date has been reduced by interest shortfalls due to prepayments;
 
          (iv)
           the aggregate amount of  any Periodic Advances  by the Servicer,  the
           Master  Servicer  or the  Trustee  included in  the  amounts actually
    distributed to the Certificateholders;
 
           (v)
           to each holder of a Certificate entitled to the benefits of  payments
           under any form of credit enhancement or from any Reserve Fund:
 
              (a)
               the  amounts  so  distributed  under  any  such  form  of  credit
               enhancement or  from  any such  Reserve  Fund on  the  applicable
       Distribution Date; and
 
              (b)
               the  amount of coverage  remaining under any  such form of credit
               enhancement and  the  balance in  any  such Reserve  Fund,  after
       giving  effect  to  any  payments thereunder  and  other  amounts charged
       thereto on the Distribution Date;
 
          (vi)
           in the case of a Series of Certificates with a variable  Pass-Through
           Rate, such Pass-Through Rate;
 
         (vii)
           the book value of any collateral acquired by the Trust Estate through
           foreclosure or otherwise;
 
        (viii)
           the  unpaid principal  balance of any  Mortgage Loan as  to which the
           Servicer has  notified the  Master Servicer  that such  Servicer  has
    determined  not  to  foreclose  because it  believes  the  related Mortgaged
    Property may  be  contaminated  with  or affected  by  hazardous  wastes  or
    hazardous substances; and
 
          (ix)
           the  number  and aggregate  principal  amount of  Mortgage  Loans one
           month, two months and three or more months delinquent.
 
    In addition,  within a  reasonable period  of  time after  the end  of  each
calendar  year, the Master Servicer will furnish either directly, or through the
Trustee, a report to  each Certificateholder of record  at any time during  such
calendar   year  such  information  as  required  by  the  Code  and  applicable
regulations  thereunder  to  enable  Certificateholders  to  prepare  their  tax
returns.  In the event that an election has  been made to treat the Trust Estate
(or one or more segregated pools of assets therein) as 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."
 
                                       55
<PAGE>
LIST OF CERTIFICATEHOLDERS
 
    The Pooling and Servicing Agreement for each Series will require the Trustee
to  provide  access  to  the  most  current  list  of  names  and  addresses  of
Certificateholders   of   such   Series   to  any   group   of   five   or  more
Certificateholders who  advise  the  Trustee  in writing  that  they  desire  to
communicate with other Certificateholders with respect to their rights under the
Pooling and Servicing Agreement or under the Certificates.
 
EVENTS OF DEFAULT
 
    Events  of Default under the Pooling and Servicing Agreement for each Series
include (i) any failure by the Master Servicer to make a required deposit  which
continues  unremedied for three business days after the giving of written notice
of such failure to the Master Servicer by the Trustee for such Series, or to the
Master Servicer and the  Trustee by the holders  of Certificates of such  Series
having  voting  rights  allocated  to  such  Certificates  ("Voting  Interests")
aggregating not  less  than  25%  of  the  Voting  Interests  allocated  to  all
Certificates  for such Series; (ii)  any failure by the  Master Servicer duly to
observe or  perform  in any  material  respect any  other  of its  covenants  or
agreements in the Pooling and Servicing Agreement which continues unremedied for
60  days (or 30  days in the  case of a  failure to maintain  any pool insurance
policy  required  to  be  maintained  pursuant  to  the  Pooling  and  Servicing
Agreement)  after the  giving of  written notice of  such failure  to the Master
Servicer by  the Trustee,  or to  the Master  Servicer and  the Trustee  by  the
holders  of Certificates aggregating not less  than 25% of the Voting Interests;
(iii) certain events of insolvency,  readjustment of debt, marshaling of  assets
and liabilities or similar proceedings and certain action by the Master Servicer
indicating  its insolvency, reorganization  or inability to  pay its obligations
and (iv) it and any subservicer  appointed by it becoming ineligible to  service
for both FNMA and FHLMC (unless remedied within 90 days). (Section 7.01).
 
RIGHTS UPON EVENT OF DEFAULT
 
    So  long as  an Event  of Default remains  unremedied under  the Pooling and
Servicing Agreement for  a Series,  the Trustee for  such Series  or holders  of
Certificates  of such  Series evidencing  not less  than 66  2/3% of  the Voting
Interests in the Trust Estate  for such Series may  terminate all of the  rights
and obligations of the Master Servicer under the Pooling and Servicing Agreement
and  in and  to the Mortgage  Loans (other  than the Master  Servicer's right to
recovery of  the  aggregate Master  Servicing  Fees due  prior  to the  date  of
termination,  and other expenses  and amounts advanced pursuant  to the terms of
the Pooling  and Servicing  Agreement,  which rights  the Master  Servicer  will
retain  under all circumstances), whereupon the  Trustee will succeed to all the
responsibilities, duties  and  liabilities  of the  Master  Servicer  under  the
Pooling and Servicing Agreement and will be entitled to monthly compensation not
to   exceed  the  aggregate  Master  Servicing  Fees  together  with  the  other
compensation to which  the Master  Servicer is  entitled under  the Pooling  and
Servicing  Agreement. In the event that the Trustee is unwilling or unable so to
act, it  may select,  pursuant to  the  public bid  procedure described  in  the
applicable  Pooling and  Servicing Agreement, or  petition a  court of competent
jurisdiction to  appoint,  a  housing  and home  finance  institution,  bank  or
mortgage  servicing institution with a net worth  of at least $10,000,000 to act
as successor to  the Master  Servicer under the  provisions of  the Pooling  and
Servicing  Agreement;  provided  however,  that until  such  a  successor Master
Servicer  is  appointed  and  has  assumed  the  responsibilities,  duties   and
liabilities  of the Master  Servicer under the  Pooling and Servicing Agreement,
the Trustee shall continue as the successor to the Master Servicer as  described
above.  In the event such public bid  procedure is utilized, the successor would
be entitled to compensation in an amount equal to the aggregate Master Servicing
Fees, together  with the  other compensation  to which  the Master  Servicer  is
entitled  under the  Pooling and  Servicing Agreement,  and the  Master Servicer
would be entitled to receive the net profits, if any, realized from the sale  of
its  rights and obligations under the Pooling and Servicing Agreement. (Sections
7.01 and 7.05).
 
    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,
 
                                       56
<PAGE>
method  and place of conducting  any proceeding for any  remedy available to the
Trustee or exercising any  trust or power conferred  upon the Trustee.  However,
the  Trustee will not  be under any obligation  to pursue any  such remedy or to
exercise any  of  such trusts  or  powers unless  such  Certificateholders  have
offered  the Trustee reasonable security or indemnity against the cost, expenses
and liabilities which may be incurred by the Trustee thereby. Also, the  Trustee
may  decline to  follow any  such direction if  the Trustee  determines that the
action or proceeding so directed may not  lawfully be taken or would involve  it
in   personal  liability  or  be   unjustly  prejudicial  to  the  non-assenting
Certificateholders. (Sections 7.02 and 7.03).
 
    No Certificateholder of a Series, solely  by virtue of such holder's  status
as  a Certificateholder,  will have  any right  under the  Pooling and Servicing
Agreement for  such Series  to  institute any  proceeding  with respect  to  the
Pooling  and Servicing Agreement, unless such holder previously has given to the
Trustee for such  Series written  notice of default  and unless  the holders  of
Certificates  evidencing  not less  than 25%  of the  Voting Interests  for such
Series have made written request upon  the Trustee to institute such  proceeding
in its own name as Trustee thereunder and have offered to the Trustee reasonable
indemnity  and the Trustee for 60 days has neglected or refused to institute any
such proceeding. (Section 10.03).
 
AMENDMENT
 
    Each Pooling  and Servicing  Agreement may  be amended  by the  Seller,  the
Master  Servicer and the Trustee without  the consent of the Certificateholders,
(i) to  cure  any  ambiguity or  mistake,  (ii)  to correct  or  supplement  any
provision  therein that  may be inconsistent  with any  other provision therein,
(iii) to modify, eliminate  or add to  any of its provisions  to such extent  as
shall  be necessary to maintain the qualification of the Trust Estate (or one or
more segregated  pools of  assets therein)  as a  REMIC at  all times  that  any
Certificates  are outstanding or to avoid or minimize the risk of the imposition
of any tax  on the  Trust Estate  pursuant to  the Code  that would  be a  claim
against  the Trust Estate, provided that the  Trustee has received an opinion of
counsel to the  effect that such  action is necessary  or desirable to  maintain
such  qualification or to  avoid or minimize  the risk of  the imposition of any
such tax and  such action will  not, as  evidenced by such  opinion of  counsel,
adversely affect in any material respect the interests of any Certificateholder,
(iv)  to  change  the timing  and/or  nature  of deposits  into  the Certificate
Account, provided  that such  change will  not, as  evidenced by  an opinion  of
counsel,  adversely  affect  in  any  material  respect  the  interests  of  any
Certificateholder and  that  such change  will  not adversely  affect  the  then
current  rating assigned to any Certificates, as evidenced by a letter from each
Rating Agency to such effect, (v) to add to, modify or eliminate any  provisions
therein  restricting transfers of residual  Certificates to certain disqualified
organizations described below under "Certain Federal Income Tax Consequences  --
Federal  Income Tax Consequences for REMIC  Certificates -- Taxation of Residual
Certificates -- Tax-Related Restrictions on Transfer of Residual  Certificates,"
(vi)  to make certain provisions  with respect to the  denominations of, and the
manner of payments on, certain  Classes or Subclasses of Certificates  initially
retained  by the Seller or  an affiliate, or (vii)  to make any other provisions
with respect to matters  or questions arising under  such Pooling and  Servicing
Agreement  that are not inconsistent with  the provisions thereof, provided that
such action will not, as evidenced by an opinion of counsel, adversely affect in
any material  respect the  interests of  the Certificateholders  of the  related
Series.  The Pooling and Servicing Agreement may  also be amended by the Seller,
the Master  Servicer  and  the  Trustee  with the  consent  of  the  holders  of
Certificates  evidencing  interests aggregating  not less  than  66 2/3%  of the
Voting Interests  evidenced  by  the  Certificates of  each  Class  or  Subclass
affected thereby, for the purpose of adding any provisions to or changing in any
manner  or  eliminating any  of  the provisions  of  such Pooling  and Servicing
Agreement or of modifying  in any manner the  rights of the  Certificateholders;
provided,  however, that  no such  amendment may  (i) reduce  in any  manner the
amount of, or delay the timing of,  any payments 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
 
                                       57
<PAGE>
the Voting Interests evidenced  by such Class or  Subclass, or (iii) reduce  the
aforesaid  percentage of Certificates  of any Class or  Subclass, the holders of
which are required  to consent  to such amendment,  without the  consent of  the
holders of all Certificates of such Class or Subclass affected then outstanding.
Notwithstanding  the  foregoing,  the  Trustee  will  not  consent  to  any such
amendment if such amendment  would subject the Trust  Estate (or any  segregated
pool of assets therein) to tax or cause the Trust Estate (or any segregated pool
of assets therein) to fail to qualify as a REMIC.
 
TERMINATION; OPTIONAL PURCHASE OF MORTGAGE LOANS
 
    The  obligations created by the Pooling and Servicing Agreement for a Series
of Certificates  will terminate  on the  Distribution Date  following the  final
payment  or other liquidation of the last  Mortgage Loan subject thereto and the
disposition of all property acquired upon foreclosure of any such Mortgage Loan.
In no  event, however,  will the  trust  created by  the Pooling  and  Servicing
Agreement  continue beyond the expiration of 21 years from the death of the last
survivor of certain persons named in  such Pooling and Servicing Agreement.  For
each Series of Certificates, the Trustee will give written notice of termination
of  the Pooling and Servicing Agreement to each Certificateholder, and the final
distribution  will  be  made  only  upon  surrender  and  cancellation  of   the
Certificates at an office or agency appointed by the Seller and specified in the
notice of termination.
 
    If  so provided  in the  applicable Prospectus  Supplement, the  Pooling and
Servicing Agreement  for  each  Series  of Certificates  will  permit,  but  not
require, the Seller, Norwest Mortgage or such other party as is specified in the
applicable  Prospectus Supplement,  to purchase from  the Trust  Estate for such
Series all  remaining Mortgage  Loans at  the time  subject to  the Pooling  and
Servicing  Agreement at a price specified  in such Prospectus Supplement. In the
event that such  party has caused  the related Trust  Estate (or any  segregated
pool  of assets  therein) to be  treated as a  REMIC, any such  purchase will be
effected only pursuant to a "qualified  liquidation" as defined in Code  Section
860F(a)(4)(A)  and the receipt by the Trustee  of an opinion of counsel or other
evidence that such purchase will  not (i) result in the  imposition of a tax  on
"prohibited  transactions" under Code Section 860F(a)(1), (ii) otherwise subject
the Trust Estate to tax, or (iii) cause the Trust Estate (or any segregated pool
of assets) to fail to qualify as a REMIC. The exercise of such right will effect
early retirement  of  the Certificates  of  that Series,  but  the right  so  to
purchase  may be  exercised only  after the  aggregate principal  balance of the
Mortgage Loans for such Series at the time of purchase is less than a  specified
percentage  of  the aggregate  principal  balance at  the  Cut-Off Date  for the
Series, or after the date set forth in the applicable Prospectus Supplement.
 
THE TRUSTEE
 
    The Trustee under each Pooling and Servicing Agreement (the "Trustee")  will
be  named in the applicable Prospectus  Supplement. The commercial bank or trust
company serving as Trustee may have normal banking relationships with the Seller
or any of its affiliates.
 
    The Trustee may resign at any time, in which event the Master Servicer  will
be obligated to appoint a successor trustee. The Master Servicer may also remove
the  Trustee if the  Trustee ceases to be  eligible to act  as Trustee under the
Pooling and Servicing Agreement, if the Trustee becomes insolvent or in order to
change the situs of the Trust Estate for state tax reasons. Upon becoming  aware
of  such circumstances, the  Master Servicer will become  obligated to appoint a
successor trustee. The Trustee may also be removed at any time by the holders of
Certificates evidencing not less than 51%  of the Voting Interests in the  Trust
Estate,  except that, any Certificate registered in  the name of the Seller, the
Master Servicer  or any  affiliate thereof  will not  be taken  into account  in
determining  whether the requisite Voting Interest in the Trust Estate necessary
to effect any such removal has been obtained. Any resignation and removal of the
Trustee, and the appointment of a  successor trustee, will not become  effective
until  acceptance of such appointment by the successor trustee. The 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
 
                                       58
<PAGE>
least $50,000,000, provided that the Trustee's and any such successor  trustee's
separate capital and surplus shall at all times be at least the amount specified
in  Section 310(a)(2) of the Trust Indenture Act of 1939, and will be subject to
supervision or examination by federal or state authorities.
 
                  CERTAIN LEGAL ASPECTS OF THE MORTGAGE LOANS
 
    The following  discussion contains  summaries of  certain legal  aspects  of
mortgage  loans  which are  general in  nature. Because  such legal  aspects are
governed by  applicable state  law (which  laws may  differ substantially),  the
summaries do not purport to be complete or to reflect the laws of any particular
state,  nor to encompass  the laws of all  states in which  the security for the
Mortgage Loans is  situated. The summaries  are qualified in  their entirety  by
reference to the applicable federal and state laws governing the Mortgage Loans.
 
GENERAL
 
    The Mortgage Loans will, in general, be secured by either first mortgages or
first  deeds of trust,  depending upon the  prevailing practice in  the state in
which the underlying  property is located.  A mortgage creates  a lien upon  the
real  property described in the  mortgage. There are two  parties to a mortgage:
the mortgagor, who is the borrower (or,  in the case of a Mortgage Loan  secured
by  a property  that has been  conveyed to  an INTER VIVOS  revocable trust, the
settlor of such  trust); and the  mortgagee, who  is the lender.  In a  mortgage
instrument  state,  the  mortgagor delivers  to  the  mortgagee a  note  or bond
evidencing the loan and the mortgage. Although  a deed of trust is similar to  a
mortgage,  a deed  of trust  has three  parties: a  borrower called  the trustor
(similar to  a  mortgagor),  a  lender called  the  beneficiary  (similar  to  a
mortgagee), and a third-party grantee called the trustee. Under a deed of trust,
the  borrower grants the property, irrevocably until the debt is paid, in trust,
generally with a power of  sale, to the trustee to  secure payment of the  loan.
The  trustee's authority  under a  deed of  trust and  the mortgagee's authority
under a mortgage are governed by the express provisions of the deed of trust  or
mortgage, applicable law, and, in some cases, with respect to the deed of trust,
the directions of the beneficiary.
 
FORECLOSURE
 
    Foreclosure  of  a mortgage  is generally  accomplished by  judicial action.
Generally, the action is  initiated by the service  of legal pleadings upon  all
parties  having an interest of record in the real property. Delays in completion
of the  foreclosure  occasionally  may  result  from  difficulties  in  locating
necessary  parties  defendant.  When  the mortgagee's  right  of  foreclosure is
contested,  the  legal  proceedings  necessary  to  resolve  the  issue  can  be
time-consuming.  After the completion of  a judicial foreclosure proceeding, the
court may  issue a  judgment of  foreclosure  and appoint  a receiver  or  other
officer  to conduct the sale of the property. In some states, mortgages may also
be foreclosed by  advertisement, pursuant  to a power  of sale  provided in  the
mortgage.  Foreclosure of a mortgage by  advertisement is essentially similar to
foreclosure of a deed of trust by non-judicial power of sale.
 
    Foreclosure of a deed of trust  is generally accomplished by a  non-judicial
trustee's  sale under a specific provision in  the deed of trust that authorizes
the trustee  to sell  the property  to a  third party  upon any  default by  the
borrower  under the terms of the note or  deed of trust. In certain states, such
foreclosure also may be accomplished by  judicial action in the manner  provided
for  foreclosure of mortgages. In some states,  the trustee must record a notice
of default and send  a copy to  the borrower-trustor and to  any person who  has
recorded  a request for  a copy of  a notice of  default and notice  of sale. In
addition, the trustee must provide notice in some states to any other individual
having an  interest  of  record  in the  real  property,  including  any  junior
lienholders.  If the deed of trust is  not reinstated within any applicable cure
period, a notice of sale must be posted  in a public place and, in most  states,
published for a specified period of time in one or more newspapers. In addition,
some  state laws  require that a  copy of  the notice of  sale be  posted on the
property and sent to all parties having an interest of record in the property.
 
    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
 
                                       59
<PAGE>
junior encumbrance on the real estate, may, during a reinstatement period,  cure
the  default by paying the entire amount  in arrears plus the costs and expenses
incurred in enforcing the obligation. Certain  state laws control the amount  of
foreclosure  expenses  and  costs,  including  attorneys'  fees,  which  may  be
recovered by a lender.
 
    In case of foreclosure under either a mortgage or a deed of trust, the  sale
by  the receiver  or other designated  officer, or  by the trustee,  is a public
sale. However, because  of the difficulty  a potential buyer  at the sale  would
have in determining the exact status of title and because the physical condition
of  the property may have deteriorated during the foreclosure proceedings, it is
uncommon for a  third party to  purchase the property  at the foreclosure  sale.
Rather, it is common for the lender to purchase the property from the trustee or
receiver for an amount equal to the unpaid principal amount of the note, accrued
and  unpaid interest and the expenses of foreclosure. Thereafter, subject to the
right of  the  borrower  in some  states  to  remain in  possession  during  the
redemption  period, the lender  will assume the  burdens of ownership, including
obtaining hazard insurance  and making such  repairs at its  own expense as  are
necessary  to render  the property suitable  for sale. The  lender commonly will
obtain the services of a real estate  broker and pay the broker a commission  in
connection  with the sale of the property. Depending upon market conditions, the
ultimate proceeds  of  the sale  of  the property  may  not equal  the  lender's
investment  in the property. Any loss may  be reduced by the receipt of mortgage
insurance proceeds, if any, or by  judicial action against the borrower for  the
deficiency,  if  such  action  is  permitted  by  law.  See  "-- Anti-Deficiency
Legislation and Other Limitations on Lenders" below.
 
FORECLOSURE ON SHARES OF COOPERATIVES
 
    The cooperative shares owned  by the tenant-stockholder  and pledged to  the
lender  are, in  almost all  cases, subject to  restrictions on  transfer as set
forth in the cooperative's Certificate of Incorporation and By-laws, as well  as
in  the proprietary lease  or occupancy agreement,  and may be  cancelled by the
cooperative  for  failure  by  the  tenant-stockholder  to  pay  rent  or  other
obligations  or charges  owed by  such tenant-stockholder,  including mechanics'
liens  against   the   cooperative   apartment   building   incurred   by   such
tenant-stockholder.  The  proprietary  lease  or  occupancy  agreement generally
permits the cooperative  to terminate such  lease or agreement  in the event  an
obligor  fails  to make  payments or  defaults in  the performance  of covenants
required thereunder.  Typically, the  lender and  the cooperative  enter into  a
recognition  agreement  which establishes  the  rights and  obligations  of both
parties in the event of a  default by the tenant-stockholder on its  obligations
under   the  proprietary  lease  or  occupancy   agreement.  A  default  by  the
tenant-stockholder under  the  proprietary  lease or  occupancy  agreement  will
usually constitute a default under the security agreement between the lender and
the tenant-stockholder.
 
    The  recognition agreement  generally provides that,  in the  event that the
tenant-stockholder has  defaulted  under  the  proprietary  lease  or  occupancy
agreement,  the  cooperative will  take  no action  to  terminate such  lease or
agreement until the lender has been provided an opportunity to cure the default.
The recognition agreement typically  provides that if  the proprietary lease  or
occupancy  agreement is terminated, the  cooperative will recognize the lender's
lien against  proceeds  from  a  sale of  the  cooperative  apartment,  subject,
however,  to the cooperative's right to sums due under such proprietary lease or
occupancy agreement. The  total amount owed  to the cooperative  by the  tenant-
stockholder,  which the lender  generally cannot restrict  and does not monitor,
could reduce the value of the collateral below the outstanding principal balance
of the cooperative loan and accrued and unpaid interest thereon.
 
    Recognition agreements also provide that in the event of a foreclosure on  a
cooperative  loan,  the  lender  must  obtain the  approval  or  consent  of the
cooperative as  required  by  the  proprietary  lease  before  transferring  the
cooperative  shares or assigning the proprietary lease. Generally, the lender is
not limited  by the  agreement  in any  rights it  may  have to  dispossess  the
tenant-stockholders.
 
    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
 
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<PAGE>
those  shares. Article  9 of  the UCC  requires that  a sale  be conducted  in a
"commercially reasonable" manner. Whether a foreclosure sale has been  conducted
in  a "commercially reasonable" manner will depend on the facts in each case. In
determining commercial reasonableness, a court will look to the notice given the
debtor and  the  method, manner,  time,  place  and terms  of  the  foreclosure.
Generally,  a sale  conducted according to  the usual practice  of banks selling
similar collateral will be considered reasonably conducted.
 
    Article 9 of the UCC provides that the proceeds of the sale will be  applied
first  to  pay the  costs  and expenses  of  the sale  and  then to  satisfy the
indebtedness  secured  by  the  lender's  security  interest.  The   recognition
agreement,  however, generally provides that the lender's right to reimbursement
is subject to the right of the cooperative corporation to receive sums due under
the proprietary lease or occupancy  agreement. If there are proceeds  remaining,
the  lender must account to the  tenant-stockholder for the surplus. Conversely,
if a  portion of  the  indebtedness remains  unpaid, the  tenant-stockholder  is
generally  responsible for  the deficiency. See  "-- Anti-Deficiency Legislation
and Other Limitations on Lenders" below.
 
RIGHTS OF REDEMPTION
 
    In some states, after sale pursuant to a deed of trust and/or foreclosure of
a mortgage,  the borrower  and certain  foreclosed junior  lienors are  given  a
statutory  period in which to redeem the  property from the foreclosure sale. In
most states where the right of redemption is available, statutory redemption may
occur upon  payment of  the  foreclosure purchase  price, accrued  interest  and
taxes.  In some states, the right to redeem is an equitable right. The effect of
a right  of redemption  is  to delay  the  ability of  the  lender to  sell  the
foreclosed  property. The  exercise of  a right  of redemption  would defeat the
title of any  purchaser at  a foreclosure  sale, or  of any  purchaser from  the
lender  subsequent  to  judicial foreclosure  or  sale  under a  deed  of trust.
Consequently, the  practical effect  of the  redemption right  is to  force  the
lender  to maintain  the property  and pay the  expenses of  ownership until the
redemption period has run.
 
ANTI-DEFICIENCY LEGISLATION AND OTHER LIMITATIONS ON LENDERS
 
    Certain states have imposed statutory  restrictions that limit the  remedies
of  a beneficiary under a deed of trust or a mortgagee under a mortgage. In some
states, statutes limit  the right of  the beneficiary or  mortgagee to obtain  a
deficiency  judgment against the borrower following  foreclosure or sale under a
deed of trust. A deficiency judgment  is a personal judgment against the  former
borrower  equal in most  cases to the  difference between the  amount due to the
lender and the net amount realized upon the foreclosure sale.
 
    Some state statutes may require the beneficiary or mortgagee to exhaust  the
security afforded under a deed of trust or mortgage by foreclosure in an attempt
to satisfy the full debt before bringing a personal action against the borrower.
In certain other states, the lender has the option of bringing a personal action
against  the  borrower  on  the debt  without  first  exhausting  such security;
however, in  some  of these  states,  the  lender, following  judgment  on  such
personal  action, may be  deemed to have  elected a remedy  and may be precluded
from exercising  remedies  with  respect  to  the  security.  Consequently,  the
practical  effect of the election requirement,  when applicable, is that lenders
will usually proceed first against the security rather than bringing a  personal
action against the borrower.
 
    Other  statutory provisions  may limit  any deficiency  judgment against the
former borrower following a  foreclosure sale to the  excess of the  outstanding
debt  over the fair market value  of the property at the  time of such sale. The
purpose of  these statutes  is to  prevent  a beneficiary  or a  mortgagee  from
obtaining a large deficiency judgment against the former borrower as a result of
low or no bids at the foreclosure sale.
 
    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.
 
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<PAGE>
    Generally, Article 9 of  the UCC governs  foreclosure on cooperative  shares
and  the related proprietary lease or occupancy agreement and foreclosure on the
beneficial interest in a land trust. Some courts have interpreted Section  9-504
of  the UCC to prohibit a deficiency  award unless the creditor establishes that
the sale of the  collateral (which, in  the case of a  Mortgage Loan secured  by
shares  of a cooperative, would be such shares and the related proprietary lease
or occupancy agreement) was conducted in a commercially reasonable manner.
 
    A Servicer generally will  not be required  under the applicable  Underlying
Servicing Agreement to pursue deficiency judgments on the Mortgage Loans even if
permitted by law.
 
    In  addition  to  anti-deficiency and  related  legislation,  numerous other
federal and state  statutory provisions, including  the federal bankruptcy  laws
and  state laws affording  relief to debtors,  may interfere with  or affect the
ability of a secured mortgage lender to realize upon its security. For  example,
numerous statutory provisions under the United States Bankruptcy Code, 11 U.S.C.
Sections  101 ET SEQ., (the "Bankruptcy Code")  may interfere with or affect the
ability of the  Seller to obtain  payment of  a Mortgage Loan,  to realize  upon
collateral  and/or  enforce a  deficiency judgment.  For example,  under federal
bankruptcy  law,  virtually  all  actions  (including  foreclosure  actions  and
deficiency  judgment proceedings) are automatically stayed  upon the filing of a
bankruptcy petition, and often no interest or principal payments are made during
the course of the  bankruptcy proceeding. In a  case under the Bankruptcy  Code,
the  secured party is precluded from  foreclosing without authorization from the
bankruptcy court. In addition, a court with federal bankruptcy jurisdiction  may
permit  a debtor  through his or  her Chapter  11 or Chapter  13 plan  to cure a
monetary default in  respect of a  Mortgage Loan by  paying arrearages within  a
reasonable  time  period  and  reinstating the  original  mortgage  loan payment
schedule even though the lender accelerated the mortgage loan and final judgment
of foreclosure had been entered in state court (provided no foreclosure sale had
yet occurred) prior  to the filing  of the debtor's  petition. Some courts  with
federal  bankruptcy jurisdiction  have approved  plans, based  on the particular
facts of the case, that effected the curing of a mortgage loan default by paying
arrearages over a number of years.
 
    If a  Mortgage Loan  is secured  by property  NOT consisting  solely of  the
debtor's  principal residence,  the Bankruptcy  Code also  permits such Mortgage
Loan to be modified. Such modifications may include reducing the amount of  each
monthly payment, changing the rate of interest, altering the repayment schedule,
and  reducing the lender's security interest to  the value of the property, thus
leaving the  lender in  the position  of a  general unsecured  creditor for  the
difference  between the value of the property and the outstanding balance of the
Mortgage Loan. Some courts have  permitted such modifications when the  Mortgage
Loan  is  secured  both by  the  debtor's  principal residence  and  by personal
property.
 
    If a court relieves a borrower's  obligation to repay amounts otherwise  due
on  a Mortgage Loan, the Servicer will  not be required to advance such amounts,
and any loss in respect thereof will be borne by the Certificateholders.
 
    The Internal Revenue Code of 1986, as amended, provides priority to  certain
tax  liens over  the lien of  the mortgage  or deed of  trust. The  laws of some
states provide priority to certain  tax liens over the  lien of the mortgage  or
deed  of trust. Numerous federal and  some state consumer protection laws impose
substantive  requirements  upon   mortgage  lenders  in   connection  with   the
origination, servicing and enforcement of mortgage loans. These laws include the
federal  Truth  in Lending  Act, Real  Estate  Settlement Procedures  Act, Equal
Credit Opportunity Act, Fair Credit Billing Act, Fair Credit Reporting Act,  and
related  statutes  and regulations.  These federal  laws  and state  laws impose
specific statutory liabilities  upon lenders who  originate or service  mortgage
loans and who fail to comply with the provisions of the law. In some cases, this
liability may affect assignees of the mortgage loans.
 
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<PAGE>
SOLDIERS' AND SAILORS' CIVIL RELIEF ACT AND SIMILAR LAWS
 
    Generally, under the terms of the Soldiers' and Sailors' Civil Relief Act of
1940,  as amended  (the "Relief  Act"), a  borrower who  enters military service
after the origination of such borrower's Mortgage Loan (including a borrower who
is a member of  the National Guard or  is in reserve status  at the time of  the
origination  of the Mortgage Loan and is later called to active duty) may not be
charged interest above an annual rate of 6% during the period of such borrower's
active duty status,  unless a  court orders  otherwise upon  application of  the
lender.  It  is  possible  that  such  action  could  have  an  effect,  for  an
indeterminate period of  time, on the  ability of the  Servicer to collect  full
amounts  of interest  on certain of  the Mortgage  Loans in a  Trust Estate. Any
shortfall in interest collections resulting  from the application of the  Relief
Act  could result in  losses to the  holders of the  Certificates of the related
Series. Further,  the Relief  Act  imposes limitations  which would  impair  the
ability  of the Servicer  to foreclose on  an affected Mortgage  Loan during the
borrower's period of active duty status. Thus, in the event that such a Mortgage
Loan goes  into  default, there  may  be delays  and  losses occasioned  by  the
inability  to realize upon  the Mortgaged Property in  a timely fashion. Certain
states have enacted comparable  legislation which may  interfere with or  affect
the ability of the Servicer to timely collect payments of principal and interest
on,  or to  foreclose on,  Mortgage Loans  of borrowers  in such  states who are
active or reserve members of the armed services.
 
ENVIRONMENTAL CONSIDERATIONS
 
    Under the  federal  Comprehensive Environmental  Response  Compensation  and
Liability  Act, as amended ("CERCLA"), and under  state law in certain states, a
secured party which takes a deed  in lieu of foreclosure, purchases a  mortgaged
property  at  a foreclosure  sale or  operates a  mortgaged property  may become
liable in  certain circumstances  for  the costs  of remedial  action  ("Cleanup
Costs")  if  hazardous  wastes or  hazardous  substances have  been  released or
disposed of on the  property. Such Cleanup Costs  may be substantial. Under  the
laws  of certain states, failure to perform the remediation required or demanded
by the state of any condition or  circumstance that (i) may pose an imminent  or
substantial  endangerment to  the public health  or welfare  or the environment,
(ii) may result in a release or threatened release of any hazardous  substances,
or  (iii) may give rise to any environmental  claim or demand may give rise to a
lien  on  the  property  to  ensure  the  reimbursement  of  Cleanup  Costs   (a
"Superlien").  All subsequent  liens on such  property are  subordinated to such
Superlien and, in  some states, even  prior recorded liens  are subordinated  to
such Superliens. In the latter states, the security interest of the Trustee in a
property that is subject to such a Superlien could be adversely affected.
 
    The  state of  the law  is currently  unclear as  to whether  and under what
circumstances Cleanup Costs, or the  obligation to take remedial actions,  could
be  imposed on a secured lender such as the Trust Estate. Under the laws of some
states and under CERCLA, a  lender may be liable as  an "owner or operator"  for
costs of addressing releases or threatened releases of hazardous substances on a
mortgaged  property if such lender or  its agents or employees have participated
in  the  management  of  the  operations  of  the  borrower,  even  though   the
environmental  damage or threat was caused by  a prior owner or current owner or
operator or other third  party. Excluded from CERCLA's  definition of "owner  or
operator,"  however, is a person "who without participating in the management of
the facility,  holds indicia  of  ownership primarily  to protect  his  security
interest"  (the "secured-creditor exemption").  This exemption for  holders of a
security interest such as a secured lender applies only when the lender seeks to
protect its security interest in the contaminated facility or property. Thus, if
a lender's  activities  begin to  encroach  on  the actual  management  of  such
facility  or  property, the  lender faces  potential liability  as an  "owner or
operator" under CERCLA. Similarly, when a lender forecloses and takes title to a
contaminated facility  or  property,  the  lender  may  incur  potential  CERCLA
liability  in various circumstances,  including among others,  when it holds the
facility or  property  as  an  investment (including  leasing  the  facility  or
property  to a third party), fails to market the property in a timely fashion or
fails to properly address environmental conditions at the property or facility.
 
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<PAGE>
    A decision  in May  1990  of the  United States  Court  of Appeals  for  the
Eleventh Circuit in UNITED STATES V. FLEET FACTORS CORP. very narrowly construed
CERCLA's  secured-creditor exemption. The court's opinion suggests that a lender
need not have involved  itself in the day-to-day  operations of the facility  or
participated in decisions relating to hazardous waste to be liable under CERCLA;
rather,  liability  could  attach  to  a  lender  if  its  involvement  with the
management of the  facility is broad  enough to support  the inference that  the
lender  had  the capacity  to influence  the  borrower's treatment  of hazardous
waste. The court  added that  a lender's  capacity to  influence such  decisions
could be inferred from the extent of its involvement in the facility's financial
management.  A subsequent decision by the United States Court of Appeals for the
Ninth Circuit in IN RE BERGSOE METAL CORP., apparently disagreeing with, but not
expressly contradicting, the FLEET FACTORS court, held that a secured lender had
no liability absent "some actual management of the facility" on the part of  the
lender.  On April  29, 1992, the  United States  Environmental Protection Agency
(the  "EPA")  issued  a  final   rule  interpreting  and  delineating   CERCLA's
secured-creditor  exemption and  the range  of permissible  actions that  may be
undertaken by a holder of a  contaminated facility without exceeding the  bounds
of  the secured-creditor exemption. On February 4, 1994, the United States Court
of Appeals for the District of Columbia Circuit in KELLEY V. EPA invalidated the
EPA rule. As a result of the KELLEY  case, the state of the law with respect  to
the  secured creditor  exemption remains unclear.  In addition, even  if the EPA
rule or a replacement  were to be  reinstated, the EPA  rule or its  replacement
would  not necessarily affect the potential for liability in actions by either a
state or a private party under CERCLA or in actions under other federal or state
laws which may impose liability on "owners or operators" but do not  incorporate
the secured-creditor exemption. Traditionally, residential mortgage lenders have
not taken steps to evaluate whether hazardous wastes or hazardous substances are
present  with respect to any mortgaged property  prior to the origination of the
mortgage  loan  or  prior  to   foreclosure  or  accepting  a  deed-in-lieu   of
foreclosure.  Accordingly,  neither  the Seller,  Norwest  Mortgage  nor Norwest
Funding has  made such  evaluations prior  to the  origination of  the  Mortgage
Loans,   nor  does  Norwest  Mortgage  or  Norwest  Funding  require  that  such
evaluations be made by originators who  have sold the Mortgage Loans to  Norwest
Mortgage.  Neither the Seller nor Norwest  Mortgage is required to undertake any
such  evaluations  prior   to  foreclosure  or   accepting  a  deed-in-lieu   of
foreclosure.   Neither   the  Seller   nor   the  Master   Servicer   makes  any
representations or  warranties or  assumes  any liability  with respect  to  the
absence  or effect of hazardous wastes  or hazardous substances on any Mortgaged
Property or any  casualty resulting  from the  presence or  effect of  hazardous
wastes  or hazardous  substances. See  "The Trust  Estates --  Mortgage Loans --
Representations  and  Warranties"  and  "Servicing  of  the  Mortgage  Loans  --
Enforcement  of Due-on-Sale Clauses; Realization  Upon Defaulted Mortgage Loans"
above.
 
"DUE-ON-SALE" CLAUSES
 
    The forms  of note,  mortgage and  deed of  trust relating  to  conventional
Mortgage Loans may contain a "due-on-sale" clause permitting acceleration of the
maturity  of a loan if  the borrower transfers its  interest in the property. In
recent  years,  court  decisions  and  legislative  actions  placed  substantial
restrictions  on the right  of lenders to  enforce such clauses  in many states.
However, effective  October  15,  1982, Congress  enacted  the  Garn-St  Germain
Depository  Institutions Act of 1982 (the  "Garn Act") which purports to preempt
state laws which prohibit the enforcement of "due-on-sale" clauses by  providing
among  other matters, that  "due-on-sale" clauses in  certain loans (which loans
may include the Mortgage Loans)  made after the effective  date of the Garn  Act
are enforceable, within certain limitations as set forth in the Garn Act and the
regulations  promulgated thereunder. "Due-on-sale" clauses contained in mortgage
loans originated by  federal savings  and loan associations  or federal  savings
banks  are fully  enforceable pursuant  to regulations  of the  Office of Thrift
Supervision ("OTS"), as successor to the Federal Home Loan Bank Board ("FHLBB"),
which preempt  state  law  restrictions  on the  enforcement  of  such  clauses.
Similarly,  "due-on-sale" clauses in  mortgage loans made  by national banks and
federal  credit  unions  are  now  fully  enforceable  pursuant  to   preemptive
regulations  of the  Comptroller of the  Currency and the  National Credit Union
Administration, respectively.
 
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<PAGE>
    The  Garn  Act  created  a  limited  exemption  from  its  general  rule  of
enforceability  for  "due-on-sale" clauses  in  certain mortgage  loans ("Window
Period Loans") which were originated by non-federal lenders and made or  assumed
in  certain states ("Window Period States")  during the period, prior to October
15, 1982,  in  which that  state  prohibited the  enforcement  of  "due-on-sale"
clauses  by constitutional provision,  statute or statewide  court decision (the
"Window Period"). Though neither the Garn  Act nor the OTS regulations  actually
names  the Window Period States, the  Federal Home Loan Mortgage Corporation has
taken the  position,  in  prescribing mortgage  loan  servicing  standards  with
respect  to mortgage loans which it has purchased, that the Window Period States
were:  Arizona,  Arkansas,  California,   Colorado,  Georgia,  Iowa,   Michigan,
Minnesota,  New Mexico, Utah and Washington. Under the Garn Act, unless a Window
Period State took action by October 15,  1985, the end of the Window Period,  to
further  regulate enforcement of  "due-on-sale" clauses in  Window Period Loans,
"due-on-sale" clauses would become enforceable even in Window Period Loans. Five
of the Window Period States (Arizona, Minnesota, Michigan, New Mexico and  Utah)
have taken actions which restrict the enforceability of "due-on-sale" clauses in
Window  Period Loans beyond October 15, 1985.  The actions taken vary among such
states.
 
    By virtue  of  the  Garn Act,  a  Servicer  may generally  be  permitted  to
accelerate  any conventional Mortgage Loan which contains a "due-on-sale" clause
upon transfer of an interest in the property subject to the mortgage or deed  of
trust.  With respect to any Mortgage Loan  secured by a residence occupied or to
be occupied  by the  borrower, this  ability  to accelerate  will not  apply  to
certain  types of transfers, including (i)  the granting of a leasehold interest
which has a term of three years or less and which does not contain an option  to
purchase,  (ii) a transfer to a relative resulting from the death of a borrower,
or a transfer where the  spouse or children become an  owner of the property  in
each  case where  the transferee(s) will  occupy the property,  (iii) a transfer
resulting from a decree of  dissolution of marriage, legal separation  agreement
or  from an incidental property settlement agreement by which the spouse becomes
an owner of  the property,  (iv) the  creation of  a lien  or other  encumbrance
subordinate  to  the lender's  security instrument  which does  not relate  to a
transfer of rights  of occupancy  in the property  (provided that  such lien  or
encumbrance  is not created pursuant to a  contract for deed), (v) a transfer by
devise, descent or operation of law on the death of a joint tenant or tenant  by
the entirety, (vi) a transfer into an INTER VIVOS trust in which the borrower is
the  beneficiary and which does not relate to a transfer of rights of occupancy;
and (vii) other  transfers as  set forth  in the  Garn Act  and the  regulations
thereunder.  The extent of the  effect of the Garn Act  on the average lives and
delinquency rates of the Mortgage Loans cannot be predicted. See "Prepayment and
Yield Considerations."
 
APPLICABILITY OF USURY LAWS
 
    Title V of the Depository Institutions Deregulation and Monetary Control Act
of  1980,  enacted  in  March  1980  ("Title  V"),  provides  that  state  usury
limitations shall not apply to certain types of residential first mortgage loans
originated  by certain lenders after March 31, 1980. The OTS as successor to the
FHLBB  is   authorized  to   issue  rules   and  regulations   and  to   publish
interpretations governing implementation of Title V.  The statute authorized any
state  to reimpose interest rate limits by  adopting before April 1, 1983, a law
or constitutional provision which expressly  rejects application of the  federal
law.  Fifteen  states have  adopted laws  reimposing or  reserving the  right to
reimpose interest  rate  limits. In  addition,  even where  Title  V is  not  so
rejected,  any state is  authorized to adopt a  provision limiting certain other
loan charges.
 
    The Seller will represent and warrant in the Pooling and Servicing Agreement
to the Trustee for the benefit of Certificateholders that all Mortgage Loans are
originated in full compliance with applicable state laws, including usury  laws.
See  "The Pooling and Servicing Agreement -- Assignment of Mortgage Loans to the
Trustee."
 
ENFORCEABILITY OF CERTAIN PROVISIONS
 
    Standard forms  of  note,  mortgage  and deed  of  trust  generally  contain
provisions  obligating the  borrower to  pay a late  charge if  payments are not
timely made and in some circumstances may provide
 
                                       65
<PAGE>
for prepayment fees or penalties if the obligation is paid prior to maturity. In
certain states, there are or may be specific limitations upon late charges which
a lender may  collect from a  borrower for delinquent  payments. Certain  states
also  limit  the  amounts  that a  lender  may  collect from  a  borrower  as an
additional charge  if the  loan  is prepaid.  Under  the Pooling  and  Servicing
Agreement,  late charges and prepayment fees (to the extent permitted by law and
not waived  by the  Servicer) will  be retained  by the  Servicer as  additional
servicing compensation.
 
    Courts  have imposed  general equitable  principles upon  foreclosure. These
equitable principles are  generally designed  to relieve the  borrower from  the
legal effect of defaults under the loan documents. Examples of judicial remedies
that  may be fashioned  include judicial requirements  that the lender undertake
affirmative and expensive  actions to  determine the causes  for the  borrower's
default and the likelihood that the borrower will be able to reinstate the loan.
In  some cases, courts have substituted their judgment for the lender's judgment
and have required  lenders to  reinstate loans  or recast  payment schedules  to
accommodate  borrowers who are suffering from temporary financial disability. In
some cases, courts have limited the right of lenders to foreclose if the default
under the mortgage instrument is not  monetary, such as the borrower failing  to
adequately  maintain the property or the borrower executing a second mortgage or
deed of trust  affecting the  property. In other  cases, some  courts have  been
faced  with  the issue  of whether  federal  or state  constitutional provisions
reflecting due process concerns for adequate notice require that borrowers under
the deeds of  trust receive  notices in addition  to the  statutorily-prescribed
minimum  requirements. For  the most  part, these  cases have  upheld the notice
provisions as being reasonable or have found that the sale by a trustee under  a
deed  of trust  or under  a mortgage  having a  power of  sale does  not involve
sufficient state action to afford constitutional protections to the borrower.
 
                    CERTAIN FEDERAL INCOME TAX CONSEQUENCES
 
    The following  general  discussion  represents the  opinion  of  Cadwalader,
Wickersham & Taft as to the anticipated material federal income tax consequences
of the purchase, ownership and disposition of Certificates. The discussion below
does  not purport  to address  all federal income  tax consequences  that may be
applicable to particular categories of investors,  some of which may be  subject
to  special rules. The authorities on which this discussion is based are subject
to change or differing  interpretations, and any  such change or  interpretation
could apply retroactively. This discussion reflects the applicable provisions of
the  Code, as well  as regulations (the "REMIC  Regulations") promulgated by the
U.S. Department of the Treasury on  December 23, 1992. Investors should  consult
their  own tax advisors in  determining the federal, state,  local and any other
tax  consequences  to  them  of  the  purchase,  ownership  and  disposition  of
Certificates.
 
    For  purposes of this discussion, where the applicable Prospectus Supplement
provides for a  Fixed Retained Yield  with respect  to the Mortgage  Loans of  a
Series of Certificates, references to the Mortgage Loans will be deemed to refer
to  that portion of  the Mortgage Loans held  by the Trust  Estate that does not
include   the   Fixed   Retained   Yield.   References   to   a   "Holder"    or
"Certificateholder"  in this discussion generally mean the beneficial owner of a
Certificate.
 
             FEDERAL INCOME TAX CONSEQUENCES FOR REMIC CERTIFICATES
 
GENERAL
 
    With respect to a particular Series of Certificates, an election may be made
to treat the Trust Estate or one  or more segregated pools of assets therein  as
one  or more REMICs within the meaning of Code Section 860D. A Trust Estate or a
portion or portions thereof as to which one or more REMIC elections will be made
will be  referred  to  as a  "REMIC  Pool."  For purposes  of  this  discussion,
Certificates  of a Series as  to which one or more  REMIC elections are made are
referred to as "REMIC Certificates" and will  consist of one or more Classes  of
"Regular  Certificates" and one Class of  "Residual Certificates" in the case of
each REMIC  Pool. Qualification  as  a REMIC  requires ongoing  compliance  with
certain   conditions.  With  respect  to  each  Series  of  REMIC  Certificates,
Cadwalader,
 
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<PAGE>
Wickersham & Taft, counsel  to the Seller,  has advised the  Seller that in  the
firm's  opinion,  assuming  (i)  the making  of  an  appropriate  election, (ii)
compliance with the Pooling and  Servicing Agreement, and (iii) compliance  with
any  changes in  the law,  including any  amendments to  the Code  or applicable
Treasury regulations thereunder,  each REMIC Pool  will qualify as  a REMIC.  In
such case, the Regular Certificates will be considered to be "regular interests"
in  the REMIC Pool and generally will be treated for federal income tax purposes
as if they were newly originated debt instruments, and the Residual Certificates
will be considered to be "residual interests" in the REMIC Pool. The  Prospectus
Supplement  for each  Series of Certificates  will indicate whether  one or more
REMIC elections with respect to the related Trust Estate will be made, in  which
event  references to "REMIC" or "REMIC Pool"  herein shall be deemed to refer to
each such REMIC Pool.
 
STATUS OF REMIC CERTIFICATES
 
    REMIC Certificates held by a mutual savings bank or a domestic building  and
loan  association will  constitute "qualifying  real property  loans" within the
meaning of Code Section 593(d)(1) in the same proportion that the assets of  the
REMIC  Pool would be so treated. REMIC  Certificates held by a domestic building
and loan association will constitute "a regular or residual interest in a REMIC"
within the meaning  of Code  Section 7701(a)(19)(C)(xi) in  the same  proportion
that  the assets of  the REMIC Pool  would be treated  as "loans...secured by an
interest in real property" within the meaning of Code Section  7701(a)(19)(C)(v)
or  as other assets described in Code Section 7701(a)(19)(C). REMIC Certificates
held by a  real estate  investment trust  will constitute  "real estate  assets"
within  the meaning  of Code Section  856(c)(5)(A), and interest  on the Regular
Certificates and income with respect to Residual Certificates will be considered
"interest on obligations secured by mortgages  on real property or on  interests
in  real property" within the  meaning of Code Section  856(c)(3)(B) in the same
proportion that, for both  purposes, the assets  of the REMIC  Pool would be  so
treated. If at all times 95% or more of the assets of the REMIC Pool qualify for
each  of the foregoing  treatments, the REMIC Certificates  will qualify for the
corresponding status in their entirety. For purposes of Code Sections  593(d)(1)
and  856(c)(5)(A), payments of principal and interest on the Mortgage Loans that
are reinvested pending distribution to holders of REMIC Certificates qualify for
such treatment. Where two REMIC Pools are a part of a tiered structure they will
be treated as  one REMIC for  purposes of the  tests described above  respecting
asset  ownership of  more or less  than 95%. In  addition, if the  assets of the
REMIC include Buy-Down Loans, it is possible that the percentage of such  assets
constituting "qualifying real property loans" or "loans...secured by an interest
in real property" for purposes of Code Sections 593(d)(1) and 7701(a)(19)(C)(v),
respectively,  may  be required  to  be reduced  by  the amount  of  the related
Buy-Down Funds. REMIC Certificates held  by a regulated investment company  will
not  constitute  "Government  securities"  within the  meaning  of  Code Section
851(b)(4)(A)(i). REMIC Certificates held by certain financial institutions  will
constitute  an "evidence  of indebtedness"  within the  meaning of  Code Section
582(c)(1).
 
QUALIFICATION AS A REMIC
 
    In order for the  REMIC Pool to  qualify as a REMIC,  there must be  ongoing
compliance  on the part of the REMIC Pool with the requirements set forth in the
Code. The REMIC Pool  must fulfill an  asset test, which  requires that no  more
than  a DE MINIMIS portion of  the assets of the REMIC  Pool, as of the close of
the third calendar month beginning after  the "Startup Day" (which for  purposes
of this discussion is the date of issuance of the REMIC Certificates) and at all
times  thereafter, may  consist of assets  other than  "qualified mortgages" and
"permitted investments." The REMIC Regulations provide a safe harbor pursuant to
which the DE  MINIMIS requirement  will be  met if  at all  times the  aggregate
adjusted  basis of  the nonqualified  assets is  less than  1% of  the aggregate
adjusted basis of all the REMIC Pool's assets. An entity that fails to meet  the
safe harbor may nevertheless demonstrate that it holds no more than a DE MINIMIS
amount  of  nonqualified  assets. A  REMIC  Pool also  must  provide "reasonable
arrangements" to prevent its residual interests from being held by "disqualified
organizations" or agents thereof and must furnish applicable tax information  to
transferors  or agents that violate this  requirement. See "Taxation of Residual
Certificates -- Tax-Related Restrictions on Transfer of Residual Certificates --
Disqualified Organizations."
 
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<PAGE>
    A qualified mortgage  is any obligation  that is principally  secured by  an
interest  in real property and  that is either transferred  to the REMIC Pool on
the Startup Day or is  purchased by the REMIC  Pool within a three-month  period
thereafter  pursuant to  a fixed  price contract in  effect on  the Startup Day.
Qualified mortgages include whole  mortgage loans, such  as the Mortgage  Loans,
and,  generally, certificates  of beneficial  interest in  a grantor  trust that
holds mortgage loans and regular interests in another REMIC, such as  lower-tier
regular  interests in a  tiered REMIC. The REMIC  Regulations specify that loans
secured by timeshare  interests and  shares held by  a tenant  stockholder in  a
cooperative housing corporation can be qualified mortgages. A qualified mortgage
includes a qualified replacement mortgage, which is any property that would have
been treated as a qualified mortgage if it were transferred to the REMIC Pool on
the  Startup Day and that  is received either (i)  in exchange for any qualified
mortgage within  a three-month  period  thereafter or  (ii)  in exchange  for  a
"defective  obligation"  within  a  two-year  period  thereafter.  A  "defective
obligation" includes  (i)  a mortgage  in  default or  as  to which  default  is
reasonably  foreseeable, (ii) a mortgage as  to which a customary representation
or warranty made at the  time of transfer to the  REMIC Pool has been  breached,
(iii)  a mortgage that  was fraudulently procured  by the mortgagor,  and (iv) a
mortgage that was not in fact principally secured by real property (but only  if
such  mortgage is disposed of within 90 days of discovery). A Mortgage Loan that
is "defective" as described in  clause (iv) that is not  sold or, if within  two
years of the Startup Day, exchanged, within 90 days of discovery, ceases to be a
qualified mortgage after such 90-day period.
 
    Permitted  investments  include  cash  flow  investments,  qualified reserve
assets, and  foreclosure property.  A  cash flow  investment is  an  investment,
earning  a return  in the  nature of  interest, of  amounts received  on or with
respect to qualified mortgages for a temporary period, not exceeding 13  months,
until the next scheduled distribution to holders of interests in the REMIC Pool.
A qualified reserve asset is any intangible property held for investment that is
part  of any reasonably required reserve maintained by the REMIC Pool to provide
for payments of  expenses of the  REMIC Pool or  amounts due on  the regular  or
residual  interests in  the event of  defaults (including  delinquencies) on the
qualified  mortgages,  lower  than  expected  reinvestment  returns,  prepayment
interest  shortfalls and certain  other contingencies. The  reserve fund will be
disqualified if more than 30% of the  gross income from the assets in such  fund
for  the year is derived from the sale or other disposition of property held for
less than three  months, unless  required to prevent  a default  on the  regular
interests caused by a default on one or more qualified mortgages. A reserve fund
must  be reduced "promptly and appropriately"  as payments on the Mortgage Loans
are received. Foreclosure property is real  property acquired by the REMIC  Pool
in  connection with the default or imminent  default of a qualified mortgage and
generally held  for not  more than  two years,  with extensions  granted by  the
Internal Revenue Service.
 
    In  addition to the foregoing requirements, the various interests in a REMIC
Pool also must meet certain requirements. All  of the interests in a REMIC  Pool
must be either of the following: (i) one or more classes of regular interests or
(ii)  a single class of  residual interests on which  distributions, if any, are
made pro rata. A regular interest is an interest in a REMIC Pool that is  issued
on  the Startup Day with  fixed terms, is designated  as a regular interest, and
unconditionally entitles the holder to receive a specified principal amount  (or
other  similar amount),  and provides that  interest payments  (or other similar
amounts), if any, at or before maturity either are payable based on a fixed rate
or a qualified variable rate, or  consist of a specified, nonvarying portion  of
the  interest  payments on  qualified mortgages.  Such  a specified  portion may
consist of a  fixed number  of basis  points, a  fixed percentage  of the  total
interest,  or a  qualified variable  rate, inverse  variable rate  or difference
between two fixed or qualified  variable rates on some  or all of the  qualified
mortgages.  The specified principal  amount of a  regular interest that provides
for interest payments consisting of a specified, nonvarying portion of  interest
payments  on qualified mortgages may be zero. A residual interest is an interest
in a REMIC Pool other than a regular interest that is issued on the Startup  Day
and  that is designated as a residual interest.  An interest in a REMIC Pool may
be treated as a regular interest even  if payments of principal with respect  to
such  interest are  subordinated to payments  on other regular  interests or the
residual interest  in  the REMIC  Pool,  and are  dependent  on the  absence  of
defaults or delinquencies on
 
                                       68
<PAGE>
qualified  mortgages or  permitted investments,  lower than  reasonably expected
returns on permitted investments, unanticipated  expenses incurred by the  REMIC
Pool or prepayment interest shortfalls. Accordingly, the Regular Certificates of
a  Series will  constitute one  or more  classes of  regular interests,  and the
Residual Certificates with respect to that Series will constitute a single class
of residual interests on which distributions are made pro rata.
 
    If an entity, such as  the REMIC Pool, fails to  comply with one or more  of
the  ongoing requirements of the Code for  REMIC status during any taxable year,
the Code provides that the entity will not  be treated as a REMIC for such  year
and  thereafter. In  this event,  an entity  with multiple  classes of ownership
interests may be  treated as  a separate  association taxable  as a  corporation
under  Treasury  regulations, and  the Regular  Certificates  may be  treated as
equity interests therein. The Code, however, authorizes the Treasury  Department
to  issue regulations that address situations where  failure to meet one or more
of the requirements for REMIC status occurs inadvertently and in good faith, and
disqualification of  the  REMIC  Pool  would  occur  absent  regulatory  relief.
Investors  should be aware, however, that the Conference Committee Report to the
Tax Reform  Act of  1986  (the "1986  Act") indicates  that  the relief  may  be
accompanied  by sanctions, such as the imposition of a corporate tax on all or a
portion of  the  REMIC  Pool's income  for  the  period of  time  in  which  the
requirements for REMIC status are not satisfied.
 
TAXATION OF REGULAR CERTIFICATES
 
    GENERAL
 
    In  general, interest,  original issue  discount, and  market discount  on a
Regular Certificate  will be  treated as  ordinary  income to  a holder  of  the
Regular Certificate (the "Regular Certificateholder"), and principal payments on
a  Regular Certificate will be  treated as a return of  capital to the extent of
the Regular  Certificateholder's  basis  in the  Regular  Certificate  allocable
thereto.  Regular Certificateholders must  use the accrual  method of accounting
with regard  to Regular  Certificates, regardless  of the  method of  accounting
otherwise used by such Regular Certificateholders.
 
    ORIGINAL ISSUE DISCOUNT
 
    Compound  Interest  Certificates  will  be,  and  other  classes  of Regular
Certificates may be, issued with "original issue discount" within the meaning of
Code Section 1273(a). Holders of any  Class or Subclass of Regular  Certificates
having original issue discount generally must include original issue discount in
ordinary  income for  federal income tax  purposes as it  accrues, in accordance
with a  constant interest  method that  takes into  account the  compounding  of
interest,  in advance of  receipt of the  cash attributable to  such income. The
following  discussion  is  based  in  part  on  temporary  and  final   Treasury
regulations  issued on February 2, 1994, as  amended on June 14, 1996, (the "OID
Regulations") under Code Sections 1271 through 1273 and 1275 and in part on  the
provisions of the 1986 Act. Regular Certificateholders should be aware, however,
that  the OID Regulations  do not adequately address  certain issues relevant to
prepayable securities,  such as  the Regular  Certificates. To  the extent  such
issues  are not addressed in  such regulations, the Seller  intends to apply the
methodology described in  the Conference Committee  Report to the  1986 Act.  No
assurance  can be  provided that  the Internal Revenue  Service will  not take a
different position  as to  those  matters not  currently  addressed by  the  OID
Regulations.  Moreover, the OID Regulations  include an anti-abuse rule allowing
the Internal Revenue Service to apply  or depart from the OID Regulations  where
necessary  or appropriate  to ensure  a reasonable  tax result  in light  of the
applicable  statutory  provisions.   A  tax  result   will  not  be   considered
unreasonable under the anti-abuse rule in the absence of a substantial effect on
the  present  value of  a  taxpayer's tax  liability.  Investors are  advised to
consult their own tax advisors as  to the discussion herein and the  appropriate
method  for reporting interest  and original issue discount  with respect to the
Regular Certificates.
 
    Each Regular Certificate (except to the extent described below with  respect
to  a  Regular  Certificate  on  which  principal  is  distributed  in  a single
installment or by  lots of  specified principal amounts  upon the  request of  a
Certificateholder  or  by random  lot (a  "Non-Pro  Rata Certificate"))  will be
treated as  a single  installment  obligation for  purposes of  determining  the
original issue discount
 
                                       69
<PAGE>
includible in a Regular Certificateholder's income. The total amount of original
issue  discount on a Regular Certificate is the excess of the "stated redemption
price at maturity" of the Regular Certificate over its "issue price." The  issue
price  of a  Class of Regular  Certificates offered pursuant  to this Prospectus
generally is the first price at which a substantial amount of such Class is sold
to the  public  (excluding  bond houses,  brokers  and  underwriters).  Although
unclear  under the OID Regulations, the Seller  intends to treat the issue price
of a Class as to which there is no substantial sale as of the issue date or that
is retained by the Seller as the fair market value of that Class as of the issue
date. The issue price of a Regular Certificate also includes any amount paid  by
an  initial Regular  Certificateholder for  accrued interest  that relates  to a
period prior to the  issue date of the  Regular Certificate, unless the  Regular
Certificateholder elects on its federal income tax return to exclude such amount
from  the issue  price and  to recover  it on  the first  Distribution Date. The
stated redemption price at maturity of a Regular Certificate always includes the
original principal amount  of the  Regular Certificate, but  generally will  not
include  distributions of  interest if such  distributions constitute "qualified
stated interest." Under the OID Regulations, qualified stated interest generally
means interest payable at a single fixed  rate or a qualified variable rate  (as
described  below)  provided  that  such  interest  payments  are unconditionally
payable at intervals of one year or  less during the entire term of the  Regular
Certificate.  Because  there is  no penalty  or  default remedy  in the  case of
nonpayment of interest  with respect to  a Regular Certificate,  it is  possible
that  no  interest on  any  Class of  Regular  Certificates will  be  treated as
qualified stated interest. However,  except as provided  in the following  three
sentences  or in  the applicable  Prospectus Supplement,  because the underlying
Mortgage Loans provide for remedies in the event of default, the Seller  intends
to  treat interest with respect to  the Regular Certificates as qualified stated
interest. Distributions of interest  on a Compound  Interest Certificate, or  on
other  Regular Certificates with respect to which deferred interest will accrue,
will not  constitute  qualified  stated  interest,  in  which  case  the  stated
redemption   price  at  maturity  of  such  Regular  Certificates  includes  all
distributions of interest  as well  as principal thereon.  Likewise, the  Seller
intends  to  treat  an interest-only  Class  or  a Class  on  which  interest is
substantially  disproportionate   to   its   principal   amount   (a   so-called
"super-premium"  Class)  as  having  no  qualified  stated  interest.  Where the
interval between the  issue date and  the first Distribution  Date on a  Regular
Certificate  is shorter than the interval between subsequent Distribution Dates,
the interest attributable to the additional days will be included in the  stated
redemption price at maturity.
 
    Under  a DE MINIMIS  rule, original issue discount  on a Regular Certificate
will be considered to be zero if such original issue discount is less than 0.25%
of the stated redemption price at maturity of the Regular Certificate multiplied
by the weighted average maturity of  the Regular Certificate. For this  purpose,
the  weighted average maturity of the Regular Certificate is computed as the sum
of the  amounts  determined by  multiplying  the  number of  full  years  (I.E.,
rounding  down partial  years) from  the issue  date until  each distribution in
reduction of stated redemption price  at maturity is scheduled  to be made by  a
fraction,  the numerator of which is the amount of each distribution included in
the stated  redemption price  at maturity  of the  Regular Certificate  and  the
denominator  of which is the stated redemption  price at maturity of the Regular
Certificate. The Conference Committee Report to  the 1986 Act provides that  the
schedule  of  such distributions  should be  determined  in accordance  with the
assumed rate of prepayment of  the Mortgage Loans (the "Prepayment  Assumption")
and  the  anticipated  reinvestment  rate,  if  any,  relating  to  the  Regular
Certificates. The  Prepayment Assumption  with respect  to a  Series of  Regular
Certificates  will be set forth in the applicable Prospectus Supplement. Holders
generally must report DE MINIMIS original  issue discount pro rata as  principal
payments  are received,  and such  income will  be capital  gain if  the Regular
Certificate is held  as a  capital asset.  Under the  OID Regulations,  however,
Regular  Certificateholders may  elect to accrue  all DE  MINIMIS original issue
discount as well as market discount and market premium, under the constant yield
method. See "Election to Treat All Interest Under the Constant Yield Method."
 
    A Regular Certificateholder generally must  include in gross income for  any
taxable  year the sum of the "daily portions," as defined below, of the original
issue discount on the Regular Certificate  accrued during an accrual period  for
each  day  on which  it holds  the  Regular Certificate,  including the  date of
purchase but  excluding the  date  of disposition.  The  Seller will  treat  the
monthly period ending
 
                                       70
<PAGE>
on  the day before each Distribution Date as the accrual period. With respect to
each Regular  Certificate, a  calculation will  be made  of the  original  issue
discount  that accrues  during each successive  full accrual  period (or shorter
period from the date of original issue) that ends on the day before the  related
Distribution Date on the Regular Certificate. The Conference Committee Report to
the  1986 Act  states that  the rate  of accrual  of original  issue discount is
intended to be based on the Prepayment Assumption. Other than as discussed below
with respect to a Non-Pro Rata Certificate, the original issue discount accruing
in a full accrual period would be the excess, if any, of (i) the sum of (a)  the
present  value of all of  the remaining distributions to  be made on the Regular
Certificate as of the end of that accrual period, and (b) the distributions made
on the Regular Certificate  during the accrual period  that are included in  the
Regular  Certificate's  stated  redemption  price  at  maturity,  over  (ii) the
adjusted issue price of the Regular Certificate at the beginning of the  accrual
period.  The present  value of  the remaining  distributions referred  to in the
preceding sentence  is calculated  based on  (i) the  yield to  maturity of  the
Regular   Certificate  at  the   issue  date,  (ii)   events  (including  actual
prepayments) that have  occurred prior  to the end  of the  accrual period,  and
(iii) the Prepayment Assumption. For these purposes, the adjusted issue price of
a  Regular Certificate at the  beginning of any accrual  period equals the issue
price of the Regular Certificate, increased by the aggregate amount of  original
issue discount with respect to the Regular Certificate that accrued in all prior
accrual  periods  and reduced  by the  amount of  distributions included  in the
Regular Certificate's stated redemption price at maturity that were made on  the
Regular  Certificate in such prior periods. The original issue discount accruing
during any accrual period (as determined in this paragraph) will then be divided
by the number of days in the  period to determine the daily portion of  original
issue  discount for each day  in the period. With  respect to an initial accrual
period shorter than a full accrual period, the daily portions of original  issue
discount  must be  determined according to  an appropriate  allocation under any
reasonable method.
 
    Under the  method described  above,  the daily  portions of  original  issue
discount  required  to  be included  in  income by  a  Regular Certificateholder
generally will  increase  to  take  into  account  prepayments  on  the  Regular
Certificates  as a result of  prepayments on the Mortgage  Loans that exceed the
Prepayment Assumption, and generally will decrease  (but not below zero for  any
period)  if  the  prepayments  are slower  than  the  Prepayment  Assumption. An
increase in  prepayments on  the Mortgage  Loans  with respect  to a  Series  of
Regular  Certificates can result in  both a change in  the priority of principal
payments with respect to certain Classes  of Regular Certificates and either  an
increase  or  decrease in  the daily  portions of  original issue  discount with
respect to such Regular Certificates.
 
    In the case of a Non-Pro  Rata Certificate, the Seller intends to  determine
the  yield to  maturity of such  Certificate based upon  the anticipated payment
characteristics of the  Class as  a whole  under the  Prepayment Assumption.  In
general,  the original issue discount accruing  on each Non-Pro Rata Certificate
in a full  accrual period would  be its  allocable share of  the original  issue
discount  with respect to the entire Class, as determined in accordance with the
preceding paragraph. However, in the case of a distribution in retirement of the
entire unpaid principal balance of any  Non-Pro Rata Certificate (or portion  of
such  unpaid  principal balance),  (a)  the remaining  unaccrued  original issue
discount allocable to such Certificate (or  to such portion) will accrue at  the
time  of  such distribution,  and  (b) the  accrual  of original  issue discount
allocable to each remaining Certificate of  such Class (or the remaining  unpaid
principal  balance  of a  partially redeemed  Non-Pro  Rata Certificate  after a
distribution of principal has  been received) will be  adjusted by reducing  the
present  value of the  remaining payments on  such Class and  the adjusted issue
price of such  Class to the  extent attributable  to the portion  of the  unpaid
principal  balance thereof  that was distributed.  The Seller  believes that the
foregoing treatment is consistent  with the "pro rata  prepayment" rules of  the
OID  Regulations,  but  with the  rate  of  accrual of  original  issue discount
determined based  on  the  Prepayment  Assumption for  the  Class  as  a  whole.
Investors are advised to consult their tax advisors as to this treatment.
 
                                       71
<PAGE>
    ACQUISITION PREMIUM
 
    A  purchaser of a Regular  Certificate at a price  greater than its adjusted
issue price  but less  than its  stated  redemption price  at maturity  will  be
required  to include in  gross income the  daily portions of  the original issue
discount on  the  Regular  Certificate  reduced pro  rata  by  a  fraction,  the
numerator  of which is the excess of its purchase price over such adjusted issue
price and  the  denominator of  which  is the  excess  of the  remaining  stated
redemption  price at maturity over the adjusted issue price. Alternatively, such
a subsequent purchaser may elect to treat all such acquisition premium under the
constant yield method, as described below  under the heading "Election to  Treat
All Interest Under the Constant Yield Method."
 
    VARIABLE RATE REGULAR CERTIFICATES
 
    Regular  Certificates may  provide for  interest based  on a  variable rate.
Under the OID Regulations, interest is treated as payable at a variable rate if,
generally, (i) the issue price does not exceed the original principal balance by
more than a specified amount  and (ii) the interest  compounds or is payable  at
least  annually at current values of (a) one or more "qualified floating rates,"
(b) a single fixed rate and one  or more qualified floating rates, (c) a  single
"objective rate," or (d) a single fixed rate and a single objective rate that is
a  "qualified inverse  floating rate." A  floating rate is  a qualified floating
rate  if  variations  in  the  rate  can  reasonably  be  expected  to   measure
contemporaneous  variations in the cost of newly borrowed funds, where such rate
is subject to a fixed multiple that is greater than 0.65 but not more than 1.35.
Such rate may also be increased or decreased  by a fixed spread or subject to  a
fixed  cap or floor, or a cap or floor that is not reasonably expected as of the
issue date to  affect the yield  of the instrument  significantly. An  objective
rate is any rate (other than a qualified floating rate) that is determined using
a  single fixed  formula and  that is based  on objective  financial or economic
information, provided that such information is not (i) within the control of the
issuer or a related party or (ii) unique to the circumstances of the issuer or a
related party. A qualified inverse floating rate is a rate equal to a fixed rate
minus  a  qualified  floating  rate  that  inversely  reflects   contemporaneous
variations in the cost of newly borrowed funds; an inverse floating rate that is
not  a qualified inverse floating rate may  nevertheless be an objective rate. A
Class of Regular Certificates may be issued under this Prospectus that does  not
have  a variable rate under the foregoing rules, for example, a Class that bears
different rates at different times during the period it is outstanding such that
it is  considered  significantly  "front-loaded"  or  "back-loaded"  within  the
meaning  of  the  OID Regulations.  It  is possible  that  such a  Class  may be
considered  to  bear  "contingent  interest"  within  the  meaning  of  the  OID
Regulations.  The OID Regulations, as they relate to the treatment of contingent
interest, are by their terms not applicable to Regular Certificates. However, if
final regulations  dealing  with contingent  interest  with respect  to  Regular
Certificates  apply the same principles as the OID Regulations, such regulations
may lead to different timing  of income inclusion than  would be the case  under
the  OID Regulations. Furthermore, application of  such principles could lead to
the characterization  of  gain  on  the  sale  of  contingent  interest  Regular
Certificates  as ordinary  income. Investors  should consult  their tax advisors
regarding the appropriate treatment of any Regular Certificate that does not pay
interest at a fixed rate or variable rate as described in this paragraph.
 
    Under the REMIC Regulations, a Regular  Certificate (i) bearing a rate  that
qualifies  as a variable rate under the  OID Regulations that is tied to current
values of a  variable rate (or  the highest, lowest  or average of  two or  more
variable  rates, including a rate  based on the average cost  of funds of one or
more financial institutions), or a positive or negative multiple of such a  rate
(plus  or  minus a  specified  number of  basis  points), or  that  represents a
weighted average of rates on some or all of the Mortgage Loans, including such a
rate that is subject to one or more caps or floors, or (ii) bearing one or  more
such  variable rates for one or more periods, or one or more fixed rates for one
or more periods, and a different variable rate or fixed rate for other  periods,
qualifies  as  a  regular interest  in  a REMIC.  Accordingly,  unless otherwise
indicated in the applicable Prospectus  Supplement, the Seller intends to  treat
Regular  Certificates that qualify  as regular interests under  this rule in the
same manner as obligations bearing a  variable rate for original issue  discount
reporting purposes.
 
                                       72
<PAGE>
    The  amount of original issue discount with respect to a Regular Certificate
bearing a variable rate  of interest will accrue  in the manner described  above
under  "Original Issue Discount," with the yield to maturity and future payments
on such Regular Certificate generally to be determined by assuming that interest
will be payable for  the life of  the Regular Certificate  based on the  initial
rate  (or, if  different, the value  of the  applicable variable rate  as of the
pricing date) for the  relevant Class. Unless  required otherwise by  applicable
final  regulations,  the  Seller  intends to  treat  such  variable  interest as
qualified stated interest, other than  variable interest on an interest-only  or
super-premium  Class,  which will  be treated  as non-qualified  stated interest
includible  in  the  stated  redemption  price  at  maturity.  Ordinary   income
reportable  for any period will  be adjusted based on  subsequent changes in the
applicable interest rate index.
 
    Although unclear under  the OID  Regulations, unless  required otherwise  by
applicable  final regulations, the Seller  intends to treat Regular Certificates
bearing an interest rate that is a weighted average of the net interest rates on
Mortgage Loans as having  qualified stated interest, except  to the extent  that
initial  "teaser" rates cause sufficiently "back-loaded" interest to create more
than DE MINIMIS original issue discount. The yield on such Regular  Certificates
for  purposes of accruing  original issue discount will  be a hypothetical fixed
rate based on the  fixed rates, in  the case of fixed  rate Mortgage Loans,  and
initial  "teaser  rates"  followed  by  fully  indexed  rates,  in  the  case of
adjustable rate Mortgage Loans. In the  case of adjustable rate Mortgage  Loans,
the applicable index used to compute interest on the Mortgage Loans in effect on
the  pricing date (or  possibly the issue date)  will be deemed  to be in effect
beginning with the period  in which the first  weighted average adjustment  date
occurring  after the issue date occurs. Adjustments will be made in each accrual
period either increasing or decreasing the amount of ordinary income  reportable
to reflect the actual Pass-Through Rate on the Regular Certificates.
 
    MARKET DISCOUNT
 
    A  purchaser of  a Regular  Certificate also  may be  subject to  the market
discount rules of Code Sections 1276 through 1278. Under these sections and  the
principles  applied  by the  OID Regulations  in the  context of  original issue
discount, "market  discount" is  the amount  by which  the purchaser's  original
basis  in the Regular Certificate (i)  is exceeded by the then-current principal
amount of the Regular Certificate, or (ii) in the case of a Regular  Certificate
having  original issue discount, is exceeded by the adjusted issue price of such
Regular Certificate at the  time of purchase. Such  purchaser generally will  be
required  to recognize ordinary income to  the extent of accrued market discount
on such Regular Certificate as distributions includible in the stated redemption
price at maturity  thereof are  received, in an  amount not  exceeding any  such
distribution.  Such market discount would  accrue in a manner  to be provided in
Treasury regulations and should take into account the Prepayment Assumption. The
Conference Committee Report to the 1986 Act provides that until such regulations
are issued, such  market discount  would accrue  either (i)  on the  basis of  a
constant interest rate, or (ii) in the ratio of stated interest allocable to the
relevant  period to the sum  of the interest for  such period plus the remaining
interest as of the end of such period,  or in the case of a Regular  Certificate
issued  with original  issue discount, in  the ratio of  original issue discount
accrued for  the relevant  period to  the  sum of  the original  issue  discount
accrued for such period plus the remaining original issue discount as of the end
of  such  period. Such  purchaser also  generally  will be  required to  treat a
portion of any gain on a sale or exchange of the Regular Certificate as ordinary
income to the extent of the market  discount accrued to the date of  disposition
under  one of the foregoing methods, less any accrued market discount previously
reported as ordinary income as partial distributions in reduction of the  stated
redemption  price at maturity were received.  Such purchaser will be required to
defer deduction of a portion  of the excess of the  interest paid or accrued  on
indebtedness  incurred  to  purchase or  carry  a Regular  Certificate  over the
interest distributable thereon. The deferred portion of such interest expense in
any taxable year generally  will not exceed the  accrued market discount on  the
Regular  Certificate for  such year. Any  such deferred interest  expense is, in
general, allowed as a  deduction not later  than the year  in which the  related
market  discount income is recognized or the Regular Certificate is disposed of.
As an alternative to the inclusion of market discount in income on the foregoing
basis, the Regular Certificateholder may elect
 
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to include  market discount  in income  currently as  it accrues  on all  market
discount  instruments acquired by such Regular Certificateholder in that taxable
year or thereafter, in which case the interest deferral rule will not apply. See
"Election to Treat All Interest Under the Constant Yield Method" below regarding
an alternative manner in which such election may be deemed to be made.
 
    By analogy to the OID Regulations, market discount with respect to a Regular
Certificate will be considered to be zero  if such market discount is less  than
0.25%  of  the remaining  stated redemption  price at  maturity of  such Regular
Certificate  multiplied  by  the  weighted  average  maturity  of  the   Regular
Certificate  (determined  as  described  above  in  the  third  paragraph  under
"Original Issue Discount") remaining after the date of purchase. It appears that
DE MINIMIS market discount would be reported  in a manner similar to DE  MINIMIS
original   issue  discount.  See  "Original   Issue  Discount"  above.  Treasury
regulations implementing the market discount rules have not yet been issued, and
therefore  investors  should  consult  their  own  tax  advisors  regarding  the
application  of  these rules.  Investors should  also consult  Revenue Procedure
92-67 concerning the elections  to include market  discount in income  currently
and to accrue market discount on the basis of the constant yield method.
 
    PREMIUM
 
    A  Regular Certificate purchased at a cost greater than its remaining stated
redemption price  at maturity  generally  is considered  to  be purchased  at  a
premium.  If the Regular  Certificateholder holds such  Regular Certificate as a
"capital  asset"  within  the  meaning   of  Code  Section  1221,  the   Regular
Certificateholder  may elect  under Code  Section 171  to amortize  such premium
under  the  constant  yield  method.  Such  election  will  apply  to  all  debt
obligations  acquired by the Regular Certificateholder at a premium held in that
taxable year or thereafter, unless revoked  with the permission of the  Internal
Revenue  Service. The  Conference Committee Report  to the 1986  Act indicates a
Congressional intent that  the same rules  that apply to  the accrual of  market
discount  on installment obligations will also  apply to amortizing bond premium
under  Code  Section  171  on  installment  obligations  such  as  the   Regular
Certificates,  although it is  unclear whether the  alternatives to the constant
interest  method  described  above   under  "Market  Discount"  are   available.
Amortizable  bond premium will be  treated as an offset  to interest income on a
Regular Certificate, rather than as a separate deduction item. See "Election  to
Treat  All  Interest  Under  the  Constant  Yield  Method"  below  regarding  an
alternative manner in which the  Code Section 171 election  may be deemed to  be
made.
 
    ELECTION TO TREAT ALL INTEREST UNDER THE CONSTANT YIELD METHOD
 
    A  holder of a  debt instrument such  as a Regular  Certificate may elect to
treat all  interest that  accrues on  the instrument  using the  constant  yield
method,  with none of  the interest being treated  as qualified stated interest.
For purposes of applying the constant yield method to a debt instrument  subject
to  such an  election, (i) "interest"  includes stated  interest, original issue
discount, DE MINIMIS  original issue  discount, market discount  and DE  MINIMIS
market  discount, as  adjusted by  any amortizable  bond premium  or acquisition
premium and (ii) the debt instrument is treated as if the instrument were issued
on the holder's acquisition  date in the amount  of the holder's adjusted  basis
immediately  after acquisition.  It is  unclear whether,  for this  purpose, the
initial Prepayment Assumption  would continue to  apply or if  a new  prepayment
assumption  as of  the date  of the holder's  acquisition would  apply. A holder
generally may make such an election on an instrument by instrument basis or  for
a  class or  group of  debt instruments.  However, if  the holder  makes such an
election with respect to a debt instrument with amortizable bond premium or with
market discount, the holder  is deemed to have  made elections to amortize  bond
premium  or to report market  discount income currently as  it accrues under the
constant yield  method,  respectively, for  all  premium bonds  held  or  market
discount  bonds acquired by the  holder in the same  taxable year or thereafter.
The election is made on the holder's  federal income tax return for the year  in
which  the  debt  instrument is  acquired  and  is irrevocable  except  with the
approval of the Internal Revenue Service. Investors should consult their own tax
advisors regarding the advisability of making such an election.
 
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<PAGE>
    TREATMENT OF LOSSES
 
    Regular Certificateholders will be required to report income with respect to
Regular Certificates on the accrual method of accounting, without giving  effect
to   delays  or  reductions   in  distributions  attributable   to  defaults  or
delinquencies on the Mortgage Loans, except to the extent it can be  established
that  such  losses  are  uncollectible. Accordingly,  the  holder  of  a Regular
Certificate, particularly a  Subordinated Certificate, may  have income, or  may
incur a diminution in cash flow as a result of a default or delinquency, but may
not  be  able to  take a  deduction (subject  to the  discussion below)  for the
corresponding loss until a  subsequent taxable year.  In this regard,  investors
are  cautioned that while they may generally  cease to accrue interest income if
it reasonably  appears that  the interest  will be  uncollectible, the  Internal
Revenue Service may take the position that original issue discount must continue
to  be accrued  in spite  of its uncollectibility  until the  debt instrument is
disposed of in a taxable transaction or becomes worthless in accordance with the
rules of Code Section 166. To the extent the rules of Code Section 166 regarding
bad debts are applicable,  it appears that  Regular Certificateholders that  are
corporations  or that otherwise hold the Regular Certificates in connection with
a trade or business should in general  be allowed to deduct as an ordinary  loss
such loss with respect to principal sustained during the taxable year on account
of  any such  Regular Certificates becoming  wholly or  partially worthless, and
that, in general, Regular  Certificateholders that are  not corporations and  do
not  hold the Regular Certificates in connection with a trade or business should
be allowed to deduct as a short-term capital loss any loss sustained during  the
taxable  year on account of a portion  of any such Regular Certificates becoming
wholly worthless. Although the matter is not free from doubt, such non-corporate
Regular Certificateholders should be allowed a  bad debt deduction at such  time
as  the principal  balance of  such Regular  Certificates is  reduced to reflect
losses resulting  from  any  liquidated Mortgage  Loans.  The  Internal  Revenue
Service,  however, could  take the position  that non-corporate  holders will be
allowed a bad debt deduction to reflect such losses only after all the  Mortgage
Loans remaining in the Trust Estate have been liquidated or the applicable Class
of Regular Certificates has been otherwise retired. The Internal Revenue Service
could  also assert that losses on  the Regular Certificates are deductible based
on some other method  that may defer  such deductions for  all holders, such  as
reducing  future cash  flow for purposes  of computing  original issue discount.
This may have the  effect of creating "negative"  original issue discount  which
would  be deductible  only against  future positive  original issue  discount or
otherwise upon termination of the Class. Regular Certificateholders are urged to
consult their  own tax  advisors regarding  the appropriate  timing, amount  and
character of any loss sustained with respect to such Regular Certificates. While
losses  attributable  to  interest  previously  reported  as  income  should  be
deductible as ordinary losses by  both corporate and non-corporate holders,  the
Internal  Revenue  Service may  take the  position  that losses  attributable to
accrued original issue discount  may only be deducted  as capital losses in  the
case  of  non-corporate holders  who  do not  hold  the Regular  Certificates in
connection with a trade or business. Special loss rules are applicable to  banks
and  thrift institutions, including rules regarding reserves for bad debts. Such
taxpayers are advised to consult their  tax advisors regarding the treatment  of
losses on Regular Certificates.
 
    SALE OR EXCHANGE OF REGULAR CERTIFICATES
 
    If a Regular Certificateholder sells or exchanges a Regular Certificate, the
Regular  Certificateholder will recognize gain or  loss equal to the difference,
if any,  between the  amount received  and  its adjusted  basis in  the  Regular
Certificate.  The adjusted basis  of a Regular  Certificate generally will equal
the cost of  the Regular Certificate  to the seller,  increased by any  original
issue  discount or  market discount  previously included  in the  seller's gross
income with respect to the Regular  Certificate and reduced by amounts  included
in  the stated redemption price at maturity of the Regular Certificate that were
previously received  by  the  seller,  by  any  amortized  premium  and  by  any
recognized losses.
 
    Except  as described  above with respect  to market discount,  and except as
provided in  this paragraph,  any gain  or loss  on the  sale or  exchange of  a
Regular Certificate realized by an investor who holds the Regular Certificate as
a  capital  asset  will  be  capital  gain or  loss  and  will  be  long-term or
 
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<PAGE>
short-term depending on whether  the Regular Certificate has  been held for  the
long-term capital gain holding period (currently, more than one year). Such gain
will  be treated as ordinary income (i) if a Regular Certificate is held as part
of a "conversion  transaction" as  defined in Code  Section 1258(c),  up to  the
amount  of interest that  would have accrued  on the Regular Certificateholder's
net investment  in  the  conversion  transaction  at  120%  of  the  appropriate
applicable  Federal rate under  Code Section 1274(d)  in effect at  the time the
taxpayer entered into  the transaction  minus any amount  previously treated  as
ordinary  income with respect to any prior disposition of property that was held
as part of such transaction,  (ii) in the case  of a non-corporate taxpayer,  to
the  extent such taxpayer has  made an election under  Code Section 163(d)(4) to
have net capital gains taxed as  investment income at ordinary income rates,  or
(iii)  to the extent that such  gain does not exceed the  excess, if any, of (a)
the amount that would have been includible in the gross income of the holder  if
its  yield on such Regular Certificate were  110% of the applicable Federal rate
as of the date of purchase, over (b) the amount of income actually includible in
the gross income  of such holder  with respect to  such Regular Certificate.  In
addition,  gain or  loss recognized  from the sale  of a  Regular Certificate by
certain banks or thrift institutions will be treated as ordinary income or  loss
pursuant  to Code Section 582(c). Pursuant  to the Revenue Reconciliation Act of
1993, capital gains of  certain non-corporate taxpayers are  subject to a  lower
maximum  tax rate than ordinary  income of such taxpayers.  The maximum tax rate
for corporations is the  same with respect to  both ordinary income and  capital
gains.
 
TAXATION OF RESIDUAL CERTIFICATES
 
    TAXATION OF REMIC INCOME
 
    Generally,  the "daily portions" of REMIC taxable income or net loss will be
includible as ordinary income or loss in determining the federal taxable  income
of  holders of Residual Certificates ("Residual Holders"), and will not be taxed
separately to the REMIC Pool. The daily portions of REMIC taxable income or  net
loss  of a Residual Holder are determined by allocating the REMIC Pool's taxable
income or net loss for each calendar quarter ratably to each day in such quarter
and by allocating such daily portion among the Residual Holders in proportion to
their respective holdings  of Residual Certificates  in the REMIC  Pool on  such
day.  REMIC taxable  income is  generally determined in  the same  manner as the
taxable income of an individual using  the accrual method of accounting,  except
that  (i) the  limitations on deductibility  of investment  interest expense and
expenses for the production of income do  not apply, (ii) all bad loans will  be
deductible  as business bad debts, and (iii) the limitation on the deductibility
of interest and  expenses related  to tax-exempt  income will  apply. The  REMIC
Pool's  gross  income includes  interest,  original issue  discount  income, and
market discount income, if any, on  the Mortgage Loans, reduced by  amortization
of  any premium on  the Mortgage Loans,  plus income from  amortization of issue
premium, if any,  on the Regular  Certificates, plus income  on reinvestment  of
cash flows and reserve assets, plus any cancellation of indebtedness income upon
allocation  of realized  losses to  the Regular  Certificates. The  REMIC Pool's
deductions include interest and original  issue discount expense on the  Regular
Certificates,  servicing  fees  on  the  Mortgage  Loans,  other  administrative
expenses of  the REMIC  Pool and  realized  losses on  the Mortgage  Loans.  The
requirement  that Residual Holders report their pro rata share of taxable income
or net loss of the REMIC Pool  will continue until there are no Certificates  of
any class of the related Series outstanding.
 
    The  taxable income recognized by a Residual Holder in any taxable year will
be affected by,  among other  factors, the  relationship between  the timing  of
recognition of interest and original issue discount or market discount income or
amortization of premium with respect to the Mortgage Loans, on the one hand, and
the  timing of  deductions for interest  (including original  issue discount) or
income from amortization of  issue premium on the  Regular Certificates, on  the
other  hand. In the event that an interest  in the Mortgage Loans is acquired by
the REMIC Pool at a discount, and one or more of such Mortgage Loans is prepaid,
the Residual  Holder may  recognize  taxable income  without being  entitled  to
receive a corresponding amount of cash because (i) the prepayment may be used in
whole  or in  part to  make distributions  in reduction  of principal  or Stated
Amount on the Regular Certificates, and (ii) the discount on the Mortgage  Loans
which  is  includible  in income  may  exceed  the deduction  allowed  upon such
distributions on those Regular Certificates on account of any unaccrued original
 
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<PAGE>
issue discount relating to those Regular  Certificates. When there is more  than
one  Class  of Regular  Certificates that  distribute  principal or  payments in
reduction  of  Stated  Amount  sequentially,  this  mismatching  of  income  and
deductions is particularly likely to occur in the early years following issuance
of  the Regular  Certificates when  distributions in  reduction of  principal or
Stated  Amount  are  being  made  in  respect  of  earlier  Classes  of  Regular
Certificates  to the  extent that such  Classes are not  issued with substantial
discount or are issued at  a premium. If taxable  income attributable to such  a
mismatching  is realized, in general, losses would  be allowed in later years as
distributions on the later  maturing Classes of  Regular Certificates are  made.
Taxable  income may also  be greater in earlier  years than in  later years as a
result of the fact that interest  expense deductions, expressed as a  percentage
of  the outstanding principal  amount of such a  Series of Regular Certificates,
may increase over  time as  distributions in  reduction of  principal or  Stated
Amount  are made on the lower yielding Classes of Regular Certificates, whereas,
to the extent  the REMIC Pool  consists of fixed  rate Mortgage Loans,  interest
income with respect to any given Mortgage Loan will remain constant over time as
a  percentage of  the outstanding principal  amount of  that loan. Consequently,
Residual Holders must have sufficient other sources of cash to pay any  federal,
state,  or local income taxes  due as a result  of such mismatching or unrelated
deductions against which  to offset such  income, subject to  the discussion  of
"excess  inclusions" below under "-- Limitations on Offset or Exemption of REMIC
Income." The timing of  such mismatching of income  and deductions described  in
this  paragraph, if present with respect to a Series of Certificates, may have a
significant adverse effect upon a Residual Holder's after-tax rate of return. In
addition, a Residual Holder's taxable  income during certain periods may  exceed
the income reflected by such Residual Holder for such periods in accordance with
generally  accepted accounting  principles. Investors  should consult  their own
accountants concerning the accounting treatment of their investment in  Residual
Certificates.
 
    BASIS AND LOSSES
 
    The  amount of any net loss of the REMIC Pool that may be taken into account
by the  Residual  Holder  is limited  to  the  adjusted basis  of  the  Residual
Certificate  as  of the  close of  the quarter  (or time  of disposition  of the
Residual Certificate if earlier), determined without taking into account the net
loss for the quarter. The  initial adjusted basis of  a purchaser of a  Residual
Certificate  is the  amount paid  for such  Residual Certificate.  Such adjusted
basis will  be increased  by the  amount of  taxable income  of the  REMIC  Pool
reportable  by the Residual Holder  and will be decreased  (but not below zero),
first, by a cash distribution from the REMIC Pool and, second, by the amount  of
loss  of the  REMIC Pool  reportable by  the Residual  Holder. Any  loss that is
disallowed on account of this limitation  may be carried over indefinitely  with
respect  to the Residual Holder  as to whom such loss  was disallowed and may be
used by such Residual  Holder only to  offset any income  generated by the  same
REMIC Pool.
 
    A Residual Holder will not be permitted to amortize directly the cost of its
Residual  Certificate as  an offset to  its share  of the taxable  income of the
related REMIC Pool. However, that taxable income will not include cash  received
by  the REMIC Pool that  represents a recovery of the  REMIC Pool's basis in its
assets. Such  recovery of  basis  by the  REMIC Pool  will  have the  effect  of
amortization  of the issue  price of the Residual  Certificates over their life.
However, in view of the possible acceleration of the income of Residual  Holders
described  above under "Taxation of REMIC Income," the period of time over which
such issue price is effectively amortized  may be longer than the economic  life
of the Residual Certificates.
 
    A Residual Certificate may have a negative value if the net present value of
anticipated tax liabilities exceeds the present value of anticipated cash flows.
The  REMIC  Regulations appear  to  treat the  issue  price of  such  a residual
interest as zero rather  than such negative amount  for purposes of  determining
the  REMIC Pool's  basis in  its assets. The  preamble to  the REMIC Regulations
states that the  Internal Revenue  Service may  provide future  guidance on  the
proper  tax  treatment of  payments  made by  a  transferor of  such  a residual
interest to induce the transferee to acquire the interest, and Residual  Holders
should consult their own tax advisors in this regard.
 
                                       77
<PAGE>
    Further,  to the extent that the initial adjusted basis of a Residual Holder
(other than an original holder) in the Residual Certificate is greater than  the
corresponding  portion  of the  REMIC Pool's  basis in  the Mortgage  Loans, the
Residual Holder will not  recover a portion of  such basis until termination  of
the   REMIC  Pool  unless  future  Treasury  regulations  provide  for  periodic
adjustments to the REMIC income otherwise  reportable by such holder. The  REMIC
Regulations  currently in effect do not so provide. See "-- Treatment of Certain
Items of REMIC Income and Expense -- Market Discount" below regarding the  basis
of  Mortgage  Loans  to the  REMIC  Pool and  "Sale  or Exchange  of  a Residual
Certificate" below regarding possible  treatment of a  loss upon termination  of
the REMIC Pool as a capital loss.
 
    TREATMENT OF CERTAIN ITEMS OF REMIC INCOME AND EXPENSE
 
    Although  the  Seller  intends  to  compute  REMIC  income  and  expense  in
accordance with the Code and  applicable regulations, the authorities  regarding
the  determination  of  specific items  of  income  and expense  are  subject to
differing interpretations. The Seller makes no representation as to the specific
method that it will use for reporting income with respect to the Mortgage  Loans
and  expenses with  respect to  the Regular  Certificates and  different methods
could result in different timing of reporting  of taxable income or net loss  to
Residual Holders or differences in capital gain versus ordinary income.
 
    ORIGINAL ISSUE DISCOUNT AND PREMIUM.  Generally, the REMIC Pool's deductions
for  original issue discount and income  from amortization of issue premium will
be determined in the  same manner as original  issue discount income on  Regular
Certificates  as  described above  under  "Taxation of  Regular  Certificates --
Original Issue Discount"  and "-- Variable  Rate Regular Certificates,"  without
regard to the DE MINIMIS rule described therein, and "-- Premium."
 
    MARKET DISCOUNT.  The REMIC Pool will have market discount income in respect
of  Mortgage Loans if, in general, the basis  of the REMIC Pool in such Mortgage
Loans is exceeded by their unpaid principal balances. The REMIC Pool's basis  in
such  Mortgage Loans is  generally the fair  market value of  the Mortgage Loans
immediately after the transfer thereof to the REMIC Pool. The REMIC  Regulations
provide  that such basis  is equal in the  aggregate to the  issue prices of all
regular and residual interests  in the REMIC Pool.  The accrued portion of  such
market discount would be recognized currently as an item of ordinary income in a
manner  similar  to original  issue discount.  Market discount  income generally
should  accrue  in  the  manner  described  above  under  "Taxation  of  Regular
Certificates -- Market Discount."
 
    PREMIUM.   Generally, if the  basis of the REMIC  Pool in the Mortgage Loans
exceeds the unpaid principal balances thereof, the REMIC Pool will be considered
to have acquired such Mortgage  Loans at a premium equal  to the amount of  such
excess.  As stated above, the  REMIC Pool's basis in  Mortgage Loans is the fair
market value of the Mortgage Loans, based  on the aggregate of the issue  prices
of  the regular and residual  interests in the REMIC  Pool immediately after the
transfer thereof to  the REMIC  Pool. In a  manner analogous  to the  discussion
above under "Taxation of Regular Certificates -- Premium," a person that holds a
Mortgage  Loan as a capital  asset under Code Section  1221 may elect under Code
Section 171 to amortize premium on Mortgage Loans originated after September 27,
1985 under the constant yield method.  Amortizable bond premium will be  treated
as an offset to interest income on the Mortgage Loans, rather than as a separate
deduction  item. Because  substantially all  of the  mortgagors on  the Mortgage
Loans are expected to be individuals, Code Section 171 will not be available for
premium on Mortgage Loans originated on or prior to September 27, 1985.  Premium
with  respect to  such Mortgage  Loans may  be deductible  in accordance  with a
reasonable method regularly employed  by the holder  thereof. The allocation  of
such premium pro rata among principal payments should be considered a reasonable
method; however, the Internal Revenue Service may argue that such premium should
be  allocated in a different manner, such as allocating such premium entirely to
the final payment of principal.
 
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<PAGE>
    LIMITATIONS ON OFFSET OR EXEMPTION OF REMIC INCOME
 
    Except in the case of certain thrift institutions, a portion (or all) of the
REMIC taxable income includible in determining the federal income tax  liability
of  a  Residual  Holder will  be  subject  to special  treatment.  That portion,
referred to as the "excess inclusion," is  equal to the excess of REMIC  taxable
income  for the  calendar quarter allocable  to a Residual  Certificate over the
daily accruals for such quarterly period of (i) 120% of the long-term applicable
Federal rate that would have applied to  the Residual Certificate (if it were  a
debt  instrument) on the  Startup Day under Code  Section 1274(d), multiplied by
(ii) the adjusted issue price of  such Residual Certificate at the beginning  of
such  quarterly period. For this purpose, the adjusted issue price of a Residual
Certificate at the beginning  of a quarter  is the issue  price of the  Residual
Certificate, plus the amount of such daily accruals of REMIC income described in
this  paragraph for all prior quarters, decreased by any distributions made with
respect to such Residual  Certificate prior to the  beginning of such  quarterly
period. Accordingly, the portion of the REMIC Pool's taxable income that will be
treated  as excess  inclusions will be  a larger  portion of such  income as the
adjusted issue price of the Residual Certificates diminishes.
 
    The portion of a  Residual Holder's REMIC taxable  income consisting of  the
excess inclusions generally may not be offset by other deductions, including net
operating  loss carryforwards, on such Residual Holder's return. Further, if the
Residual Holder is  an organization  subject to  the tax  on unrelated  business
income imposed by Code Section 511, the Residual Holder's excess inclusions will
be  treated as  unrelated business  taxable income  of such  Residual Holder for
purposes of Code Section  511. In addition, REMIC  taxable income is subject  to
30% withholding tax with respect to certain persons who are not U.S. Persons (as
defined   below  under   "Tax-Related  Restrictions  on   Transfer  of  Residual
Certificates -- Foreign  Investors"), and  the portion  thereof attributable  to
excess  inclusions is not eligible for any  reduction in the rate of withholding
tax (by treaty  or otherwise).  See "Taxation  of Certain  Foreign Investors  --
Residual  Certificates" below. Finally,  if a real estate  investment trust or a
regulated investment company owns a  Residual Certificate, a portion  (allocated
under  Treasury regulations  yet to  be issued)  of dividends  paid by  the real
estate investment trust or regulated investment  company could not be offset  by
net  operating losses of  its shareholders, would  constitute unrelated business
taxable  income  for  tax-exempt  shareholders,  and  would  be  ineligible  for
reduction of withholding to certain persons who are not U.S. Persons.
 
    An  exception  to  the  inability  of a  Residual  Holder  to  offset excess
inclusions with unrelated deductions  and net operating  losses applies to  Code
Section  593 institutions ("thrift institutions"). For purposes of applying this
rule, all  members of  an  affiliated group  filing  a consolidated  return  are
treated  as one taxpayer, except that  thrift institutions to which Code Section
593 applies,  together  with their  subsidiaries  formed to  issue  REMICs,  are
treated   as  separate   corporations.  Furthermore,  the   Code  provides  that
regulations may disallow the ability of  a thrift institution to use  deductions
to offset excess inclusions if necessary or appropriate to prevent the avoidance
of  tax. A thrift institution may not so offset its excess inclusions unless the
Residual Certificates  have "significant  value," which  requires that  (i)  the
Residual  Certificates have an issue  price that is at least  equal to 2% of the
aggregate  of  the  issue  prices  of  all  Residual  Certificates  and  Regular
Certificates  with respect to the REMIC  Pool, and (ii) the anticipated weighted
average life of  the Residual Certificates  is at least  20% of the  anticipated
weighted  average life of the REMIC  Pool. The anticipated weighted average life
of the Residual  Certificates is based  on all distributions  anticipated to  be
received with respect thereto (using the Prepayment Assumption). The anticipated
weighted  average life of the REMIC Pool  is the aggregate weighted average life
of  all  classes   of  interests   therein  (computed   using  all   anticipated
distributions  on a regular interest with  nominal or no principal). Finally, an
ordering rule under the REMIC Regulations provides that a thrift institution may
only offset  its excess  inclusion income  with deductions  after it  has  first
applied  its deductions against  income that is not  excess inclusion income. If
applicable, the Prospectus Supplement  with respect to a  Series will set  forth
whether  the  Residual Certificates  are  expected to  have  "significant value"
within the meaning of the REMIC Regulations.
 
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    TAX-RELATED RESTRICTIONS ON TRANSFER OF RESIDUAL CERTIFICATES
 
    DISQUALIFIED ORGANIZATIONS.    If any  legal  or beneficial  interest  in  a
Residual  Certificate is transferred to  a Disqualified Organization (as defined
below), a tax  would be imposed  in an amount  equal to the  product of (i)  the
present  value of the  total anticipated excess inclusions  with respect to such
Residual Certificate  for  periods  after  the transfer  and  (ii)  the  highest
marginal   federal  income  tax  rate  applicable  to  corporations.  The  REMIC
Regulations provide that the anticipated  excess inclusions are based on  actual
prepayment  experience to the date of  the transfer and projected payments based
on the  Prepayment Assumption.  The  present value  rate equals  the  applicable
Federal  rate under Code  Section 1274(d) as of  the date of  the transfer for a
term ending  with the  last  calendar quarter  in  which excess  inclusions  are
expected  to accrue. Such  rate is applied to  the anticipated excess inclusions
from the end of the remaining calendar quarters in which they arise to the  date
of  the transfer. Such a tax generally would be imposed on the transferor of the
Residual Certificate,  except  that where  such  transfer is  through  an  agent
(including   a  broker,  nominee,   or  other  middleman)   for  a  Disqualified
Organization, the  tax  would instead  be  imposed  on such  agent.  However,  a
transferor  of a Residual Certificate  would in no event  be liable for such tax
with respect to  a transfer  if the transferee  furnishes to  the transferor  an
affidavit stating that the transferee is not a Disqualified Organization and, as
of  the time of the transfer, the transferor does not have actual knowledge that
such affidavit is  false. The tax  also may  be waived by  the Internal  Revenue
Service  if  the Disqualified  Organization  promptly disposes  of  the Residual
Certificate and the transferor pays income tax at the highest corporate rate  on
the excess inclusion for the period the Residual Certificate is actually held by
the Disqualified Organization.
 
    In  addition,  if  a "Pass-Through  Entity"  (as defined  below)  has excess
inclusion income with respect  to a Residual Certificate  during a taxable  year
and  a Disqualified Organization is  the record holder of  an equity interest in
such entity, then a tax  is imposed on such entity  equal to the product of  (i)
the  amount  of excess  inclusions that  are  allocable to  the interest  in the
Pass-Through Entity during the period such interest is held by such Disqualified
Organization, and (ii) the highest  marginal federal corporate income tax  rate.
Such  tax would be deductible from the ordinary gross income of the Pass-Through
Entity for the  taxable year. The  Pass-Through Entity would  not be liable  for
such  tax if it has received an affidavit from such record holder that it is not
a Disqualified  Organization or  stating such  holder's taxpayer  identification
number  and, during the period such person  is the record holder of the Residual
Certificate, the Pass-Through Entity  does not have  actual knowledge that  such
affidavit is false.
 
    For these purposes, (i) "Disqualified Organization" means the United States,
any  state  or  political  subdivision  thereof,  any  foreign  government,  any
international  organization,  any  agency  or  instrumentality  of  any  of  the
foregoing  (provided, that such term does  not include an instrumentality if all
of its activities are subject to tax and a majority of its board of directors is
not selected  by any  such governmental  entity), any  cooperative  organization
furnishing  electric energy or  providing telephone service  to persons in rural
areas as described in  Code Section 1381(a)(2)(C),  and any organization  (other
than  a farmers' cooperative described in Code  Section 521) that is exempt from
taxation under  the Code  unless such  organization  is subject  to the  tax  on
unrelated  business income imposed  by Code Section  511, and (ii) "Pass-Through
Entity" means any  regulated investment company,  real estate investment  trust,
common  trust  fund,  partnership,  trust  or  estate  and  certain corporations
operating on  a  cooperative  basis.  Except as  may  be  provided  in  Treasury
regulations,  any  person holding  an  interest in  a  Pass-Through Entity  as a
nominee for  another  will, with  respect  to such  interest,  be treated  as  a
Pass-Through Entity.
 
    The  Pooling and Servicing  Agreement with respect to  a Series will provide
that  no  legal  or  beneficial  interest  in  a  Residual  Certificate  may  be
transferred  or registered unless  (i) the proposed  transferee furnishes to the
Seller and the Trustee an affidavit providing its taxpayer identification number
and stating  that  such transferee  is  the  beneficial owner  of  the  Residual
Certificate  and is not  a Disqualified Organization and  is not purchasing such
Residual Certificate  on  behalf of  a  Disqualified Organization  (I.E.,  as  a
broker,  nominee  or  middleman  thereof) and  (ii)  the  transferor  provides a
 
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statement in  writing to  the  Seller and  the Trustee  that  it has  no  actual
knowledge  that such  affidavit is  false. Moreover,  the Pooling  and Servicing
Agreement will provide that any attempted or purported transfer in violation  of
these transfer restrictions will be null and void and will vest no rights in any
purported  transferee. Each Residual  Certificate with respect  to a Series will
bear a legend  referring to  such restrictions  on transfer,  and each  Residual
Holder  will be deemed to  have agreed, as a  condition of ownership thereof, to
any amendments to the related Pooling and Servicing Agreement required under the
Code  or   applicable  Treasury   regulations   to  effectuate   the   foregoing
restrictions.  Information necessary to compute an applicable excise tax must be
furnished to the Internal Revenue Service and to the requesting party within  60
days  of  the request,  and  the Seller  or  the Trustee  may  charge a  fee for
computing and providing such information.
 
    NONECONOMIC RESIDUAL  INTERESTS.    The REMIC  Regulations  would  disregard
certain  transfers of Residual Certificates, in  which case the transferor would
continue to be treated as the owner of the Residual Certificates and thus  would
continue  to be subject to tax on its allocable portion of the net income of the
REMIC Pool. Under the REMIC Regulations,  a transfer of a "noneconomic  residual
interest"  (as defined below) to a Residual Holder (other than a Residual Holder
who is  not  a U.S.  Person,  as defined  below  under "Foreign  Investors")  is
disregarded  for all federal income tax purposes if a significant purpose of the
transferor is to impede the assessment or collection of tax. A residual interest
in a REMIC (including a residual interest with a positive value at issuance)  is
a  "noneconomic residual interest" unless, at the  time of the transfer, (i) the
present value of the expected future  distributions on the residual interest  at
least  equals  the  product  of  the present  value  of  the  anticipated excess
inclusions and the highest corporate income tax  rate in effect for the year  in
which  the transfer occurs, and (ii)  the transferor reasonably expects that the
transferee will receive  distributions from the  REMIC at or  after the time  at
which  taxes accrue on the anticipated excess inclusions in an amount sufficient
to satisfy the accrued  taxes on each excess  inclusion. The anticipated  excess
inclusions  and the present value rate are  determined in the same manner as set
forth above under  "Disqualified Organizations." The  REMIC Regulations  explain
that  a significant purpose to impede the assessment or collection of tax exists
if the transferor, at the time of the transfer, either knew or should have known
that the transferee would be unwilling or  unable to pay taxes due on its  share
of  the  taxable income  of the  REMIC. A  safe  harbor is  provided if  (i) the
transferor conducted, at the time of the transfer, a reasonable investigation of
the financial  condition  of  the  transferee  and  found  that  the  transferee
historically  had  paid its  debts as  they  came due  and found  no significant
evidence to indicate that the transferee would not continue to pay its debts  as
they  came  due  in  the  future, and  (ii)  the  transferee  represents  to the
transferor that it understands that, as the holder of the non-economic  residual
interest,  the transferee may incur tax liabilities  in excess of any cash flows
generated by  the  interest  and  that  the  transferee  intends  to  pay  taxes
associated  with holding the  residual interest as they  become due. The Pooling
and Servicing Agreement with respect to each Series of Certificates will require
the transferee  of a  Residual Certificate  to  certify to  the matters  in  the
preceding  sentence as part  of the affidavit described  above under the heading
"Disqualified Organizations."
 
    FOREIGN INVESTORS.   The REMIC Regulations  provide that the  transfer of  a
Residual  Certificate that has  "tax avoidance potential"  to a "foreign person"
will be disregarded for all federal tax purposes. This rule appears intended  to
apply to a transferee who is not a "U.S. Person" (as defined below), unless such
transferee's  income is  effectively connected  with the  conduct of  a trade or
business within the United States. A Residual Certificate is deemed to have  tax
avoidance potential unless, at the time of the transfer, (i) the future value of
expected  distributions equals at least 30% of the anticipated excess inclusions
after the  transfer,  and  (ii)  the  transferor  reasonably  expects  that  the
transferee will receive sufficient distributions from the REMIC Pool at or after
the  time at which the excess inclusions accrue and prior to the end of the next
succeeding taxable  year for  the accumulated  withholding tax  liability to  be
paid.  If the non-U.S. Person transfers the  Residual Certificate back to a U.S.
Person, the  transfer  will  be  disregarded and  the  foreign  transferor  will
continue  to be treated  as the owner  unless arrangements are  made so that the
transfer does not have  the effect of  allowing the transferor  to avoid tax  on
accrued excess inclusions.
 
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<PAGE>
    The  Prospectus  Supplement relating  to the  Certificates  of a  Series may
provide that a Residual  Certificate may not be  purchased by or transferred  to
any  person that  is not  a U.S.  Person or  may describe  the circumstances and
restrictions pursuant  to which  such a  transfer may  be made.  The term  "U.S.
Person"  means  a  citizen or  resident  of  the United  States,  a corporation,
partnership or other entity  created or organized  in or under  the laws of  the
United  States or any political subdivision thereof,  or an estate or trust that
is subject to U.S. federal income tax regardless of the source of its income.
 
    SALE OR EXCHANGE OF A RESIDUAL CERTIFICATE
 
    Upon the sale  or exchange of  a Residual Certificate,  the Residual  Holder
will  recognize gain or loss equal to the excess, if any, of the amount realized
over the  adjusted  basis  (as  described  above  under  "Taxation  of  Residual
Certificates  -- Basis  and Losses")  of such  Residual Holder  in such Residual
Certificate at the time of  the sale or exchange.  In addition to reporting  the
taxable  income of the REMIC Pool, a Residual Holder will have taxable income to
the extent that any  cash distribution to  it from the  REMIC Pool exceeds  such
adjusted  basis on that Distribution  Date. Such income will  be treated as gain
from the sale or exchange of the  Residual Certificate. It is possible that  the
termination of the REMIC Pool may be treated as a sale or exchange of a Residual
Holder's  Residual Certificate,  in which  case, if  the Residual  Holder has an
adjusted basis in its  Residual Certificate remaining when  its interest in  the
REMIC  Pool terminates, and if  it holds such Residual  Certificate as a capital
asset under Code Section  1221, then it  will recognize a  capital loss at  that
time in the amount of such remaining adjusted basis.
 
    Any  gain on the sale of a  Residual Certificate will be treated as ordinary
income (i)  if  a  Residual  Certificate  is  held  as  part  of  a  "conversion
transaction"  as defined in Code  Section 1258(c), up to  the amount of interest
that would have accrued  on the Residual  Certificateholder's net investment  in
the conversion transaction at 120% of the appropriate applicable Federal rate in
effect  at the time the  taxpayer entered into the  transaction minus any amount
previously treated as ordinary income with  respect to any prior disposition  of
property  that was held as a  part of such transaction or  (ii) in the case of a
non-corporate taxpayer, to the extent such  taxpayer has made an election  under
Code  Section 163(d)(4) to have net capital  gains taxed as investment income at
ordinary income rates. In addition, gain or  loss recognized from the sale of  a
Residual  Certificate by certain banks or thrift institutions will be treated as
ordinary income or loss pursuant to Code Section 582(c).
 
    The Conference Committee  Report to the  1986 Act provides  that, except  as
provided  in Treasury regulations yet to be  issued, the wash sale rules of Code
Section 1091  will apply  to  dispositions of  Residual Certificates  where  the
seller  of  the Residual  Certificate, during  the  period beginning  six months
before the sale or disposition of the Residual Certificate and ending six months
after such sale or disposition, acquires  (or enters into any other  transaction
that  results in the application of Code  Section 1091) any residual interest in
any REMIC or  any interest in  a "taxable  mortgage pool" (such  as a  non-REMIC
owner trust) that is economically comparable to a Residual Certificate.
 
    MARK TO MARKET REGULATIONS
 
    Prospective  purchasers of the Residual Certificates should be aware that on
January 3, 1995, the Internal Revenue Service released proposed regulations (the
"Proposed Mark to Market  Regulations") under Code Section  475 relating to  the
requirement  that a securities dealer mark to market securities held for sale to
customers. This  mark-to-market  requirement  applies to  all  securities  of  a
dealer,  except  to the  extent that  the dealer  has specifically  identified a
security as held for investment. The Proposed Mark to Market Regulations provide
that, for purposes of this mark-to-market requirement, a Residual Certificate is
not treated as a  security and thus  may not be marked  to market. The  Proposed
Mark  to Market  Regulations apply to  all Residual Certificates  acquired on or
after January 4, 1995.
 
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TAXES THAT MAY BE IMPOSED ON THE REMIC POOL
 
    PROHIBITED TRANSACTIONS
 
    Income from  certain  transactions  by the  REMIC  Pool,  called  prohibited
transactions,  will not be part of the  calculation of income or loss includible
in the federal income tax returns of Residual Holders, but rather will be  taxed
directly  to the  REMIC Pool at  a 100% rate.  Prohibited transactions generally
include (i)  the  disposition  of  a  qualified  mortgage  other  than  for  (a)
substitution  within two years of  the Startup Day for  a defective (including a
defaulted) obligation  (or repurchase  in lieu  of substitution  of a  defective
(including  a defaulted) obligation  at any time) or  for any qualified mortgage
within three months of  the Startup Day, (b)  foreclosure, default, or  imminent
default of a qualified mortgage, (c) bankruptcy or insolvency of the REMIC Pool,
or  (d)  a qualified  (complete) liquidation,  (ii) the  receipt of  income from
assets that are not the type of mortgages or investments that the REMIC Pool  is
permitted  to hold, (iii) the receipt of  compensation for services, or (iv) the
receipt of gain from disposition of cash flow investments other than pursuant to
a qualified liquidation. Notwithstanding  (i) and (iv), it  is not a  prohibited
transaction  to  sell  REMIC  Pool  property to  prevent  a  default  on Regular
Certificates as a result of a default on qualified mortgages or to facilitate  a
clean-up  call (generally, an optional  termination to save administrative costs
when no more than  a small percentage of  the Certificates is outstanding).  The
REMIC  Regulations indicate that  the modification of  a Mortgage Loan generally
will not  be treated  as a  disposition  if it  is occasioned  by a  default  or
reasonably  foreseeable default, an assumption of  the Mortgage Loan, the waiver
of a due-on-sale or due-on-encumbrance clause, or the conversion of an  interest
rate  by a  mortgagor pursuant  to the  terms of  a convertible  adjustable rate
Mortgage Loan.
 
    CONTRIBUTIONS TO THE REMIC POOL AFTER THE STARTUP DAY
 
    In general, the REMIC Pool will  be subject to a tax  at a 100% rate on  the
value  of any  property contributed  to the  REMIC Pool  after the  Startup Day.
Exceptions are provided for cash contributions to the REMIC Pool (i) during  the
three months following the Startup Day, (ii) made to a qualified reserve fund by
a Residual Holder, (iii) in the nature of a guarantee, (iv) made to facilitate a
qualified  liquidation  or  clean-up call,  and  (v) as  otherwise  permitted in
Treasury regulations yet to be issued. It is not anticipated that there will  be
any contributions to the REMIC Pool after the Startup Day.
 
    NET INCOME FROM FORECLOSURE PROPERTY
 
    The  REMIC  Pool  will be  subject  to  federal income  tax  at  the highest
corporate  rate  on  "net  income  from  foreclosure  property,"  determined  by
reference  to the rules applicable to  real estate investment trusts. Generally,
property  acquired  by  deed  in  lieu  of  foreclosure  would  be  treated   as
"foreclosure  property" for a period of two years, with possible extensions. Net
income from  foreclosure  property generally  means  gain  from the  sale  of  a
foreclosure   property  that  is  inventory   property  and  gross  income  from
foreclosure property other than qualifying rents and other qualifying income for
a real estate investment trust. It is  not anticipated that the REMIC Pool  will
have any taxable net income from foreclosure property.
 
LIQUIDATION OF THE REMIC POOL
 
    If a REMIC Pool adopts a plan of complete liquidation, within the meaning of
Code  Section 860F(a)(4)(A)(i), which may be  accomplished by designating in the
REMIC Pool's final tax return a date on which such adoption is deemed to  occur,
and  sells all of its assets (other  than cash) within a 90-day period beginning
on such date, the REMIC Pool will  not be subject to the prohibited  transaction
rules  on  the sale  of  its assets,  provided that  the  REMIC Pool  credits or
distributes in liquidation all  of the sale proceeds  plus its cash (other  than
amounts retained to meet claims) to holders of Regular Certificates and Residual
Holders within the 90-day period.
 
ADMINISTRATIVE MATTERS
 
    The  REMIC Pool will  be required to  maintain its books  on a calendar year
basis and to file federal income tax returns for federal income tax purposes  in
a  manner similar to a partnership. The form  for such income tax return is Form
1066,   U.S.   Real    Estate   Mortgage   Investment    Conduit   Income    Tax
 
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Return.  The Trustee will be required to sign the REMIC Pool's returns. Treasury
regulations provide that, except where there is a single Residual Holder for  an
entire  taxable  year, the  REMIC Pool  will  be subject  to the  procedural and
administrative rules  of  the Code  applicable  to partnerships,  including  the
determination by the Internal Revenue Service of any adjustments to, among other
things,  items of REMIC  income, gain, loss,  deduction, or credit  in a unified
administrative proceeding. The Master Servicer will be obligated to act as  "tax
matters  person," as defined in applicable Treasury regulations, with respect to
the REMIC  Pool, in  its capacity  as either  Residual Holder  or agent  of  the
Residual  Holders. If the Code or  applicable Treasury regulations do not permit
the Master Servicer to act as tax matters person in its capacity as agent of the
Residual Holders, the  Residual Holder chosen  by the Residual  Holders or  such
other  person specified pursuant to Treasury regulations will be required to act
as tax matters person.
 
LIMITATIONS ON DEDUCTION OF CERTAIN EXPENSES
 
    An investor  who is  an individual,  estate,  or trust  will be  subject  to
limitation with respect to certain itemized deductions described in Code Section
67, to the extent that such itemized deductions, in the aggregate, do not exceed
2%  of  the  investor's adjusted  gross  income.  In addition,  Code  Section 68
provides that itemized deductions otherwise allowable  for a taxable year of  an
individual  taxpayer will be reduced  by the lesser of (i)  3% of the excess, if
any, of adjusted gross income  over $100,000 ($50,000 in  the case of a  married
individual  filing a separate return) (subject  to adjustment for inflation), or
(ii) 80% of the amount of itemized deductions otherwise allowable for such year.
In the case of a REMIC Pool,  such deductions may include deductions under  Code
Section  212 for  the Servicing  Fee and  all administrative  and other expenses
relating to the REMIC Pool, or any similar expenses allocated to the REMIC  Pool
with respect to a regular interest it holds in another REMIC. Such investors who
hold  REMIC  Certificates either  directly or  indirectly through  certain pass-
through entities may  have their pro  rata share of  such expenses allocated  to
them  as  additional gross  income, but  may  be subject  to such  limitation on
deductions. In addition, such expenses are not deductible at all for purposes of
computing the  alternative minimum  tax,  and may  cause  such investors  to  be
subject  to significant additional tax liability. Temporary Treasury regulations
provide that the additional  gross income and  corresponding amount of  expenses
generally  are to be allocated entirely  to the holders of Residual Certificates
in the case of a REMIC Pool that  would not qualify as a fixed investment  trust
in  the absence of a  REMIC election. However, such  additional gross income and
limitation on deductions will apply to the allocable portion of such expenses to
holders of Regular Certificates,  as well as  holders of Residual  Certificates,
where  such  Regular Certificates  are issued  in  a manner  that is  similar to
pass-through  certificates  in  a  fixed  investment  trust.  Unless   indicated
otherwise  in the  applicable Prospectus Supplement,  all such  expenses will be
allocable to the Residual Certificates. In general, such allocable portion  will
be  determined  based  on the  ratio  that a  REMIC  Certificateholder's income,
determined on a  daily basis,  bears to  the income  of all  holders of  Regular
Certificates  and  Residual Certificates  with  respect to  a  REMIC Pool.  As a
result, individuals,  estates  or  trusts  holding  REMIC  Certificates  (either
directly  or  indirectly through  a grantor  trust, partnership,  S corporation,
REMIC, or  certain  other  pass-through  entities  described  in  the  foregoing
temporary  Treasury  regulations)  may  have taxable  income  in  excess  of the
interest income at the pass-through rate on Regular Certificates that are issued
in a single class or otherwise  consistently with fixed investment trust  status
or  in  excess  of  cash  distributions  for  the  related  period  on  Residual
Certificates.
 
TAXATION OF CERTAIN FOREIGN INVESTORS
 
    REGULAR CERTIFICATES
 
    Interest,  including  original  issue  discount,  distributable  to  Regular
Certificateholders  who are non-resident aliens,  foreign corporations, or other
Non-U.S. Persons (as  defined below),  will be  considered "portfolio  interest"
and,  therefore, generally will not be  subject to 30% United States withholding
tax, provided that such  Non-U.S. Person (i) is  not a "10-percent  shareholder"
within  the  meaning  of  Code  Section  871(h)(3)(B)  or  a  controlled foreign
corporation described  in  Code  Section  881(c)(3)(C)  and  (ii)  provides  the
Trustee,    or    the   person    who   would    otherwise   be    required   to
 
                                       84
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withhold tax from such  distributions under Code Section  1441 or 1442, with  an
appropriate  statement,  signed  under  penalties  of  perjury,  identifying the
beneficial owner and stating, among other  things, that the beneficial owner  of
the  Regular Certificate is a  Non-U.S. Person. If such  statement, or any other
required statement, is not provided,  30% withholding will apply unless  reduced
or eliminated pursuant to an applicable tax treaty or unless the interest on the
Regular  Certificate is  effectively connected  with the  conduct of  a trade or
business within the United States by  such Non-U.S. Person. In the latter  case,
such  Non-U.S. Person  will be  subject to United  States federal  income tax at
regular rates. Investors who are Non-U.S.  Persons should consult their own  tax
advisors  regarding the  specific tax consequences  to them of  owning a Regular
Certificate. The  term "Non-U.S.  Person" means  any person  who is  not a  U.S.
Person.
 
    RESIDUAL CERTIFICATES
 
    The  Conference Committee Report to the 1986 Act indicates that amounts paid
to Residual Holders  who are  Non-U.S. Persons  generally should  be treated  as
interest  for  purposes  of  the  30%  (or  lower  treaty  rate)  United  States
withholding tax.  Treasury  regulations  provide  that  amounts  distributed  to
Residual  Holders may qualify as "portfolio interest," subject to the conditions
described in "Regular Certificates" above, but  only to the extent that (i)  the
Mortgage  Loans were  issued after July  18, 1984  and (ii) the  Trust Estate or
segregated pool of assets therein (as to which a separate REMIC election will be
made), to which the Residual Certificate relates, consists of obligations issued
in "registered form" within  the meaning of  Code Section 163(f)(1).  Generally,
Mortgage Loans will not be, but regular interests in another REMIC Pool will be,
considered obligations issued in registered form. Furthermore, a Residual Holder
will  not be entitled  to any exemption  from the 30%  withholding tax (or lower
treaty rate)  to  the  extent of  that  portion  of REMIC  taxable  income  that
constitutes  an "excess  inclusion." See  "Taxation of  Residual Certificates --
Limitations on Offset  or Exemption  of REMIC Income."  If the  amounts paid  to
Residual  Holders who  are Non-U.S. Persons  are effectively  connected with the
conduct of  a  trade or  business  within the  United  States by  such  Non-U.S.
Persons,  30% (or  lower treaty rate)  withholding will not  apply. Instead, the
amounts paid to such Non-U.S. Persons  will be subject to United States  federal
income  tax  at regular  rates. If  30%  (or lower  treaty rate)  withholding is
applicable, such amounts generally  will be taken into  account for purposes  of
withholding  only  when  paid or  otherwise  distributed (or  when  the Residual
Certificate is disposed of) under rules similar to withholding upon  disposition
of  debt  instruments  that  have  original  issue  discount.  See  "Tax-Related
Restrictions on Transfer  of Residual Certificates  -- Foreign Investors"  above
concerning  the disregard of certain transfers having "tax avoidance potential."
Investors who  are  Non-U.S.  Persons  should consult  their  own  tax  advisors
regarding the specific tax consequences to them of owning Residual Certificates.
 
BACKUP WITHHOLDING
 
    Distributions  made on the Regular Certificates,  and proceeds from the sale
of the Regular Certificates to or through  certain brokers, may be subject to  a
"backup" withholding tax under Code Section 3406 of 31% on "reportable payments"
(including  interest distributions, original issue  discount, and, under certain
circumstances, principal  distributions)  unless the  Regular  Certificateholder
complies  with certain reporting and/or  certification procedures, including the
provision of its taxpayer identification number to the Trustee, its agent or the
broker  who   effected  the   sale   of  the   Regular  Certificate,   or   such
Certificateholder  is otherwise an exempt  recipient under applicable provisions
of the  Code.  Any amounts  to  be withheld  from  distribution on  the  Regular
Certificates  would be refunded by the Internal  Revenue Service or allowed as a
credit against the Regular Certificateholder's federal income tax liability.
 
REPORTING REQUIREMENTS
 
    Reports  of  accrued  interest,  original  issue  discount  and  information
necessary to compute the accrual of market discount will be made annually to the
Internal   Revenue  Service   and  to   individuals,  estates,   non-exempt  and
non-charitable trusts,  and partnerships  who are  either holders  of record  of
Regular Certificates or beneficial owners who own Regular Certificates through a
broker  or middleman as nominee. All  brokers, nominees and all other non-exempt
holders of record of Regular
 
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Certificates (including corporations, non-calendar year taxpayers, securities or
commodities dealers, real estate investment trusts, investment companies, common
trust funds,  thrift  institutions  and  charitable  trusts)  may  request  such
information  for any calendar  quarter by telephone or  in writing by contacting
the person designated in Internal  Revenue Service Publication 938 with  respect
to  a particular Series  of Regular Certificates.  Holders through nominees must
request such information from the nominee.
 
    The Internal Revenue  Service's Form  1066 has an  accompanying Schedule  Q,
Quarterly  Notice to  Residual Interest Holders  of REMIC Taxable  Income or Net
Loss Allocation. Treasury regulations  require that Schedule  Q be furnished  by
the  REMIC Pool to  each Residual Holder by  the end of  the month following the
close of  each calendar  quarter  (41 days  after the  end  of a  quarter  under
proposed Treasury regulations) in which the REMIC Pool is in existence.
 
    Treasury   regulations   require  that,   in   addition  to   the  foregoing
requirements, information  must  be  furnished quarterly  to  Residual  Holders,
furnished annually, if applicable, to holders of Regular Certificates, and filed
annually  with the Internal Revenue Service  concerning Code Section 67 expenses
(see "Limitations on  Deduction of  Certain Expenses" above)  allocable to  such
holders.  Furthermore,  under such  regulations,  information must  be furnished
quarterly  to  Residual  Holders,  furnished  annually  to  holders  of  Regular
Certificates,  and filed annually  with the Internal  Revenue Service concerning
the percentage of  the REMIC  Pool's assets  meeting the  qualified asset  tests
described above under "Status of REMIC Certificates."
 
FEDERAL INCOME TAX CONSEQUENCES FOR CERTIFICATES AS TO WHICH NO REMIC ELECTION
IS MADE
 
    GENERAL
 
    In  the  event that  no  election is  made  to treat  a  Trust Estate  (or a
segregated pool of assets therein) with respect to a Series of Certificates as a
REMIC, the Trust Estate will be classified  as a grantor trust under subpart  E,
Part  1 of  subchapter J  of the  Code and  not as  an association  taxable as a
corporation or a  "taxable mortgage  pool" within  the meaning  of Code  Section
7701(i).  Where there is  no Fixed Retained  Yield with respect  to the Mortgage
Loans underlying the Certificates of a  Series, and where such Certificates  are
not  designated as "Stripped Certificates," the  holder of each such Certificate
in such Series will be treated as the owner of a pro rata undivided interest  in
the  ordinary income and corpus portions of  the Trust Estate represented by its
Certificate and will be considered the beneficial owner of a pro rata  undivided
interest  in each of the  Mortgage Loans, subject to  the discussion below under
"Recharacterization of Servicing Fees." Accordingly, the holder of a Certificate
of a particular  Series will be  required to  report on its  federal income  tax
return  its  pro  rata  share  of the  entire  income  from  the  Mortgage Loans
represented by its Certificate,  including interest at the  coupon rate on  such
Mortgage  Loans, original issue  discount (if any),  prepayment fees, assumption
fees, and late payment charges received by the Servicer, in accordance with such
Certificateholder's method of accounting. A Certificateholder generally will  be
able  to deduct its share of the  Servicing Fee and all administrative and other
expenses of  the Trust  Estate  in accordance  with  its method  of  accounting,
provided  that such amounts are reasonable compensation for services rendered to
that Trust Estate. However, investors who are individuals, estates or trusts who
own Certificates,  either directly  or indirectly  through certain  pass-through
entities,  will  be  subject  to limitation  with  respect  to  certain itemized
deductions described in Code Section 67, including deductions under Code Section
212 for the Servicing Fee and all such administrative and other expenses of  the
Trust  Estate, to  the extent  that such  deductions, in  the aggregate,  do not
exceed two percent  of an investor's  adjusted gross income.  In addition,  Code
Section  68 provides that itemized deductions  otherwise allowable for a taxable
year of an individual taxpayer  will be reduced by the  lesser of (i) 3% of  the
excess, if any, of adjusted gross income over $100,000 ($50,000 in the case of a
married  individual filing  a separate  return) (in  each case,  as adjusted for
inflation), or (ii) 80% of the amount of itemized deductions otherwise allowable
for such year.  As a result,  such investors holding  Certificates, directly  or
indirectly  through a pass-through entity, may  have aggregate taxable income in
excess of  the aggregate  amount  of cash  received  on such  Certificates  with
respect  to interest  at the  pass-through rate  or as  discount income  on such
Certificates. In addition, such expenses are not deductible at all for  purposes
of
 
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computing  the  alternative minimum  tax,  and may  cause  such investors  to be
subject to significant additional tax liability. Moreover, where there is  Fixed
Retained  Yield  with  respect to  the  Mortgage  Loans underlying  a  Series of
Certificates or where the servicing fees  are in excess of reasonable  servicing
compensation,  the  transaction  will  be  subject  to  the  application  of the
"stripped bond" and  "stripped coupon"  rules of  the Code,  as described  below
under  "Stripped  Certificates"  and  "Recharacterization  of  Servicing  Fees,"
respectively.
 
    TAX STATUS
 
    Cadwalader, Wickersham  &  Taft  has  advised the  Seller  that,  except  as
described below with respect to Stripped Certificates:
 
       1.  A  Certificate owned  by a  "domestic building  and loan association"
           within the meaning of Code Section 7701(a)(19) will be considered  to
    represent  "loans...secured  by an  interest  in real  property"  within the
    meaning of Code Section 7701(a)(19)(C)(v),  provided that the real  property
    securing  the Mortgage Loans represented by  that Certificate is of the type
    described in such section of the Code.
 
       2.  A Certificate  owned by  a financial  institution described  in  Code
           Section  593(a)  will  be considered  to  represent  "qualifying real
    property loans" within the meaning of Code Section 593(d)(1), provided  that
    the   real  property  securing  the   Mortgage  Loans  represented  by  that
    Certificate is of the type described in such section of the Code.
 
       3.  A Certificate  owned  by  a  real estate  investment  trust  will  be
           considered  to represent "real  estate assets" within  the meaning of
    Code Section 856(c)(5)(A) to the extent that the assets of the related Trust
    Estate consist of qualified assets, and interest income on such assets  will
    be  considered  "interest  on  obligations  secured  by  mortgages  on  real
    property" to such extent within the meaning of Code Section 856(c)(3)(B).
 
       4.  A Certificate owned  by a REMIC  will be considered  to represent  an
           "obligation (including any participation or certificate of beneficial
    ownership  therein)  which is  principally secured  by  an interest  in real
    property" within the  meaning of  Code Section 860G(a)(3)(A)  to the  extent
    that the assets of the related Trust Estate consist of "qualified mortgages"
    within the meaning of Code Section 860G(a)(3).
 
    An  issue arises as to whether Buy-Down  Loans may be characterized in their
entirety under  the  Code  provisions  cited  in clauses  1,  2  and  3  of  the
immediately  preceding paragraph.  Code Section  593(d)(1)(C) provides  that the
term "qualifying real  property loan"  does not include  a loan  "to the  extent
secured  by a  deposit in  or share  of the  taxpayer." The  application of this
provision to a  Buy-Down Fund is  uncertain, but may  require that a  taxpayer's
investment  in  a Buy-Down  Loan  be reduced  by the  Buy-Down  Fund. As  to the
treatment of  Buy-Down Loans  as  "qualifying real  property loans"  under  Code
Section 593(d)(1) if the exception of Code Section 593(d)(1)(C) is inapplicable,
as  "loans...secured  by  an  interest  in  real  property"  under  Code Section
7701(a)(19)(C)(v) or as  "real estate assets"  under Code Section  856(c)(5)(A),
there  is indirect authority supporting treatment of an investment in a Buy-Down
Loan as entirely secured by real property  if the fair market value of the  real
property  securing the loan exceeds the principal amount of the loan at the time
of issuance or acquisition, as the case  may be. There is no assurance that  the
treatment  described above is proper.  Accordingly, Certificateholders are urged
to consult their own tax advisors concerning the effects of such arrangements on
the characterization of such  Certificateholder's investment for federal  income
tax purposes.
 
    PREMIUM AND DISCOUNT
 
    Certificateholders  are advised to consult with their tax advisors as to the
federal income tax treatment of premium and discount arising either upon initial
acquisition of Certificates or thereafter.
 
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<PAGE>
    PREMIUM.   The  treatment  of  premium  incurred  upon  the  purchase  of  a
Certificate  will  be determined  generally  as described  above  under "Federal
Income  Tax  Consequences  for  REMIC  Certificates  --  Taxation  of   Residual
Certificates -- Premium."
 
    ORIGINAL ISSUE DISCOUNT.  The original issue discount rules of Code Sections
1271  through 1275 will be applicable to a Certificateholder's interest in those
Mortgage Loans as to which the conditions for the application of those  sections
are  met. Rules regarding  periodic inclusion of  original issue discount income
are applicable  to mortgages  of  corporations originated  after May  27,  1969,
mortgages  of noncorporate mortgagors (other  than individuals) originated after
July 1, 1982, and mortgages of individuals originated after March 2, 1984. Under
the OID Regulations, such original issue discount could arise by the charging of
points by  the  originator  of the  mortgages  in  an amount  greater  than  the
statutory  DE MINIMIS exception, including a payment of points that is currently
deductible by the borrower  under applicable Code  provisions or, under  certain
circumstances,  by the presence of "teaser" rates on the Mortgage Loans. See "--
Stripped Certificates"  below  regarding  original issue  discount  on  Stripped
Certificates.
 
    Original  issue discount generally must be reported as ordinary gross income
as it  accrues under  a constant  interest method  that takes  into account  the
compounding  of interest,  in advance of  the cash attributable  to such income.
Unless  indicated  otherwise  in   the  applicable  Prospectus  Supplement,   no
prepayment  assumption will  be assumed for  purposes of  such accrual. However,
Code Section  1272 provides  for a  reduction in  the amount  of original  issue
discount includible in the income of a holder of an obligation that acquires the
obligation  after its initial  issuance at a  price greater than  the sum of the
original issue price and  the previously accrued  original issue discount,  less
prior  payments of principal. Accordingly, if  such Mortgage Loans acquired by a
Certificateholder are purchased at  a price equal to  the then unpaid  principal
amount  of such Mortgage  Loans, no original issue  discount attributable to the
difference between the  issue price and  the original principal  amount of  such
Mortgage Loans (I.E., points) will be includible by such holder.
 
    MARKET  DISCOUNT.   Certificateholders also  will be  subject to  the market
discount rules  to the  extent  that the  conditions  for application  of  those
sections  are met. Market discount on the  Mortgage Loans will be determined and
will be reported  as ordinary  income generally  in the  manner described  above
under  "Federal Income  Tax Consequences for  REMIC Certificates  -- Taxation of
Regular Certificates  --  Market  Discount," except  that  the  ratable  accrual
methods  described therein will not apply. Rather, the holder will accrue market
discount pro rata over the life of the Mortgage Loans, unless the constant yield
method is  elected.  Unless indicated  otherwise  in the  applicable  Prospectus
Supplement,  no  prepayment  assumption will  be  assumed for  purposes  of such
accrual.
 
    RECHARACTERIZATION OF SERVICING FEES
 
    If the servicing fees  paid to a Servicer  were deemed to exceed  reasonable
servicing compensation, the amount of such excess would represent neither income
nor   a  deduction  to   Certificateholders.  In  this   regard,  there  are  no
authoritative guidelines  for  federal income  tax  purposes as  to  either  the
maximum  amount of servicing  compensation that may  be considered reasonable in
the context of  this or  similar transactions  or whether,  in the  case of  the
Certificate,  the reasonableness of servicing  compensation should be determined
on a  weighted  average  or  loan-by-loan basis.  If  a  loan-by-loan  basis  is
appropriate,  the likelihood that such  amount would exceed reasonable servicing
compensation as  to some  of the  Mortgage Loans  would be  increased.  Recently
issued  Internal  Revenue Service  guidance indicates  that  a servicing  fee in
excess of reasonable compensation ("excess  servicing") will cause the  Mortgage
Loans to be treated under the "stripped bond" rules. Such guidance provides safe
harbors  for  servicing  deemed  to  be  reasonable  and  requires  taxpayers to
demonstrate that the value of  servicing fees in excess  of such amounts is  not
greater than the value of the services provided.
 
    Accordingly,  if  the  Internal  Revenue  Service's  approach  is  upheld, a
Servicer who receives a servicing fee in excess of such amounts would be  viewed
as  retaining an ownership interest in a portion of the interest payments on the
Mortgage Loans.  Under  the  rules  of Code  Section  1286,  the  separation  of
ownership  of the right  to receive some or  all of the  interest payments on an
obligation
 
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from the  right  to  receive some  or  all  of the  principal  payments  on  the
obligation  would  result  in  treatment of  such  Mortgage  Loans  as "stripped
coupons" and "stripped bonds."  Subject to the DE  MINIMIS rule discussed  below
under "-- Stripped Certificates," each stripped bond or stripped coupon could be
considered  for this purpose as a  non-interest bearing obligation issued on the
date of issue of the Certificates, and the original issue discount rules of  the
Code  would apply to the holder thereof. While Certificateholders would still be
treated as owners of beneficial interests in a grantor trust for federal  income
tax  purposes, the corpus of such trust could be viewed as excluding the portion
of the Mortgage Loans the ownership of  which is attributed to the Servicer,  or
as  including such portion  as a second class  of equitable interest. Applicable
Treasury regulations  treat such  an arrangement  as a  fixed investment  trust,
since  the  multiple classes  of  trust interests  should  be treated  as merely
facilitating direct  investments  in  the  trust assets  and  the  existence  of
multiple  classes  of  ownership interests  is  incidental to  that  purpose. In
general, such a recharacterization should  not have any significant effect  upon
the  timing or amount of income reported by a Certificateholder, except that the
income reported  by  a cash  method  holder  may be  slightly  accelerated.  See
"Stripped  Certificates" below for  a further description  of the federal income
tax treatment of stripped bonds and stripped coupons.
 
    SALE OR EXCHANGE OF CERTIFICATES
 
    Upon sale or exchange of  a Certificate, a Certificateholder will  recognize
gain or loss equal to the difference between the amount realized on the sale and
its  aggregate adjusted basis in the Mortgage Loans and other assets represented
by the Certificate.  In general,  the aggregate  adjusted basis  will equal  the
Certificateholder's  cost for  the Certificate, increased  by the  amount of any
income previously reported with respect to the Certificate and decreased by  the
amount of any losses previously reported with respect to the Certificate and the
amount  of any  distributions received  thereon. Except  as provided  above with
respect to  market  discount on  any  Mortgage  Loans, and  except  for  certain
financial  institutions subject  to the provisions  of Code  Section 582(c), any
such gain or loss generally would be capital gain or loss if the Certificate was
held as a  capital asset. However,  gain on the  sale of a  Certificate will  be
treated as ordinary income (i) if a Certificate is held as part of a "conversion
transaction"  as defined in Code  Section 1258(c), up to  the amount of interest
that would  have  accrued  on  the Certificateholder's  net  investment  in  the
conversion  transaction at  120% of the  appropriate applicable  Federal rate in
effect at the time  the taxpayer entered into  the transaction minus any  amount
previously  treated as ordinary income with  respect to any prior disposition of
property that was held as a  part of such transaction or  (ii) in the case of  a
non-corporate  taxpayer, to the extent such  taxpayer has made an election under
Code Section 163(d)(4) to have net  capital gains taxed as investment income  at
ordinary  income  rates.  Pursuant to  the  Revenue Reconciliation  Act  of 1993
capital gains of certain noncorporate taxpayers  are subject to a lower  maximum
tax  rate  than ordinary  income of  such  taxpayers. The  maximum tax  rate for
corporations is the same with respect to both ordinary income and capital gains.
 
STRIPPED CERTIFICATES
 
    GENERAL
 
    Pursuant to Code Section 1286, the  separation of ownership of the right  to
receive some or all of the principal payments on an obligation from ownership of
the  right  to receive  some  or all  of the  interest  payments results  in the
creation of "stripped bonds"  with respect to  principal payments and  "stripped
coupons"  with respect  to interest payments.  For purposes  of this discussion,
Certificates that are subject  to those rules will  be referred to as  "Stripped
Certificates." The Certificates will be subject to those rules if (i) the Seller
or  any  of its  affiliates  retains (for  its own  account  or for  purposes of
resale), in the form of Fixed Retained Yield or otherwise, an ownership interest
in a portion of the  payments on the Mortgage Loans,  (ii) the Seller or any  of
its  affiliates is treated as having an ownership interest in the Mortgage Loans
to   the   extent   it   is    paid   (or   retains)   servicing    compensation
 
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in  an amount greater  than reasonable consideration  for servicing the Mortgage
Loans (see "Certificates  -- Recharacterization of  Servicing Fees" above),  and
(iii)  a Class of Certificates  are issued in two  or more Classes or Subclasses
representing the right to non-pro-rata percentages of the interest and principal
payments on the Mortgage Loans.
 
    In general, a  holder of a  Stripped Certificate will  be considered to  own
"stripped  bonds" with respect to its pro rata  share of all or a portion of the
principal payments on each Mortgage Loan and/or "stripped coupons" with  respect
to  its pro  rata share of  all or  a portion of  the interest  payments on each
Mortgage Loan,  including  the Stripped  Certificate's  allocable share  of  the
servicing  fees  paid to  a Servicer,  to  the extent  that such  fees represent
reasonable compensation for  services rendered. See  the discussion above  under
"Certificates  -- Recharacterization of Servicing  Fees." Although not free from
doubt, for purposes of reporting  to Stripped Certificateholders, the  servicing
fees  will  be  allocated to  the  Stripped  Certificates in  proportion  to the
respective entitlements to distributions of each Class (or Subclass) of Stripped
Certificates for  the  related period  or  periods.  The holder  of  a  Stripped
Certificate  generally will be entitled  to a deduction each  year in respect of
the servicing fees, as described above under "Certificates -- General,"  subject
to the limitation described therein.
 
    Code  Section 1286 treats a stripped bond  or a stripped coupon generally as
an obligation  issued  at an  original  issue discount  on  the date  that  such
stripped  interest is purchased. Although the treatment of Stripped Certificates
for federal income tax purposes is not  clear in certain respects at this  time,
particularly  where  such Stripped  Certificates are  issued  with respect  to a
Mortgage Pool  containing  variable-rate Mortgage  Loans,  the Seller  has  been
advised  by counsel that (i) the Trust Estate will be treated as a grantor trust
under subpart E, Part I  of subchapter J of the  Code and not as an  association
taxable as a corporation or a "taxable mortgage pool" within the meaning of Code
Section  7701(i),  and (ii)  each Stripped  Certificate should  be treated  as a
single  installment  obligation  for  purposes  of  calculating  original  issue
discount  and  gain or  loss  on disposition.  This  treatment is  based  on the
interrelationship of Code Section 1286, Code Sections 1272 through 1275, and the
OID Regulations.  Although it  is  possible that  computations with  respect  to
Stripped  Certificates could be  made in one  of the ways  described below under
"Taxation of Stripped Certificates  -- Possible Alternative  Characterizations,"
the  OID Regulations state, in general, that two or more debt instruments issued
by a  single issuer  to a  single investor  in a  single transaction  should  be
treated as a single debt instrument. Accordingly, for OID purposes, all payments
on  any Stripped  Certificates should be  aggregated and treated  as though they
were made on a single debt instrument. The Pooling and Servicing Agreement  will
require  that the Trustee make and report all computations described below using
this aggregate approach, unless substantial legal authority requires otherwise.
 
    Furthermore, Treasury  regulations  issued  December 28,  1992  provide  for
treatment  of a Stripped Certificate  as a single debt  instrument issued on the
date it is purchased for purposes of calculating any original issue discount. In
addition, under  these regulations,  a Stripped  Certificate that  represents  a
right  to payments of both interest and principal may be viewed either as issued
with original issue discount  or market discount (as  described below), at a  DE
MINIMIS  original issue discount,  or, presumably, at  a premium. This treatment
indicates that the interest  component of such a  Stripped Certificate would  be
treated  as qualified stated interest under  the OID Regulations, assuming it is
not an interest-only or super-premium Stripped Certificate. Further, these final
regulations provide that the  purchaser of such a  Stripped Certificate will  be
required  to account  for any discount  as market discount  rather than original
issue discount if either (i) the  initial discount with respect to the  Stripped
Certificate  was treated as zero under the DE MINIMIS rule, or (ii) no more than
100 basis points in excess of  reasonable servicing is stripped off the  related
Mortgage  Loans. Any such market discount would be reportable as described above
under "Federal Income  Tax Consequences  for REMIC Certificates  -- Taxation  of
Regular  Certificates -- Market Discount," without regard to the DE MINIMIS rule
therein, assuming that a prepayment assumption is employed in such computation.
 
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    STATUS OF STRIPPED CERTIFICATES
 
    No specific  legal authority  exists  as to  whether  the character  of  the
Stripped Certificates, for federal income tax purposes, will be the same as that
of  the Mortgage Loans. Although  the issue is not  free from doubt, counsel has
advised the Seller that Stripped Certificates owned by applicable holders should
be considered to represent "qualifying  real property loans" within the  meaning
of  Code  Section 593(d)(1),  "real estate  assets" within  the meaning  of Code
Section 856(c)(5)(A),  "obligation[s]...principally secured  by an  interest  in
real   property"  within  the   meaning  of  Code   Section  860G(a)(3)(A),  and
"loans...secured by an  interest in real  property" within the  meaning of  Code
Section  7701(a)(19)(C)(v),  and  interest (including  original  issue discount)
income attributable to Stripped Certificates  should be considered to  represent
"interest  on  obligations secured  by mortgages  on  real property"  within the
meaning of Code Section  856(c)(3)(B), provided that in  each case the  Mortgage
Loans  and  interest on  such  Mortgage Loans  qualify  for such  treatment. The
application of  such  Code  provisions  to  Buy-Down  Loans  is  uncertain.  See
"Certificates -- Tax Status" above.
 
    TAXATION OF STRIPPED CERTIFICATES
 
    ORIGINAL  ISSUE DISCOUNT.   Except as described  above under "General," each
Stripped Certificate will be considered to have been issued at an original issue
discount for federal income tax  purposes. Original issue discount with  respect
to  a Stripped Certificate must be included in ordinary income as it accrues, in
accordance  with  a  constant  interest  method  that  takes  into  account  the
compounding  of  interest,  which  may  be prior  to  the  receipt  of  the cash
attributable to  such income.  Based in  part  on the  OID Regulations  and  the
amendments  to the original issue discount sections of the Code made by the 1986
Act, the amount of original issue discount required to be included in the income
of a holder  of a  Stripped Certificate  (referred to  in this  discussion as  a
"Stripped  Certificateholder")  in  any  taxable year  likely  will  be computed
generally as described above  under "Federal Income  Tax Consequences for  REMIC
Certificates -- Taxation of Regular Certificates -- Original Issue Discount" and
"-- Variable Rate Regular Certificates." However, with the apparent exception of
a  Stripped  Certificate  issued  with DE  MINIMIS  original  issue  discount as
described above under "General," the issue price of a Stripped Certificate  will
be  the purchase price  paid by each  holder thereof, and  the stated redemption
price at maturity will include the aggregate  amount of the payments to be  made
on the Stripped Certificate to such Stripped Certificateholder, presumably under
the Prepayment Assumption, other than qualified stated interest.
 
    If  the Mortgage Loans  prepay at a  rate either faster  or slower than that
under the Prepayment Assumption,  a Stripped Certificateholder's recognition  of
original issue discount will be either accelerated or decelerated and the amount
of  such original issue discount will be either increased or decreased depending
on the  relative interests  in  principal and  interest  on each  Mortgage  Loan
represented by such Stripped Certificateholder's Stripped Certificate. While the
matter  is not free from  doubt, the holder of  a Stripped Certificate should be
entitled in the year that it  becomes certain (assuming no further  prepayments)
that  the  holder will  not  recover a  portion of  its  adjusted basis  in such
Stripped Certificate to recognize a loss (which may be a capital loss) equal  to
such portion of unrecoverable basis.
 
    As  an alternative to the method described  above, the fact that some or all
of the interest payments with respect  to the Stripped Certificates will not  be
made  if the Mortgage  Loans are prepaid  could lead to  the interpretation that
such  interest  payments  are  "contingent"  within  the  meaning  of  the   OID
Regulations.  The OID Regulations, as they relate to the treatment of contingent
interest, are by their terms not applicable to prepayable securities such as the
Stripped Certificates.  However, if  final regulations  dealing with  contingent
interest  with respect to the Stripped Certificates apply the same principles as
the OID Regulations,  such regulations may  lead to different  timing of  income
inclusion  than  would  be  the case  under  the  OID  Regulations. Furthermore,
application of such principles could lead to the characterization of gain on the
sale of contingent interest Stripped Certificates as ordinary income.  Investors
should  consult their  tax advisors regarding  the appropriate  tax treatment of
Stripped Certificates.
 
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    SALE OR EXCHANGE OF STRIPPED CERTIFICATES.   Sale or exchange of a  Stripped
Certificate  prior to  its maturity  will result  in gain  or loss  equal to the
difference,  if   any,   between   the  amount   received   and   the   Stripped
Certificateholder's  adjusted basis  in such Stripped  Certificate, as described
above under "Federal Income Tax Consequences for REMIC Certificates --  Taxation
of  Regular Certificates  -- Sale or  Exchange of Regular  Certificates." To the
extent that a subsequent purchaser's purchase price is exceeded by the remaining
payments on  the  Stripped  Certificates,  such  subsequent  purchaser  will  be
required  for federal income tax purposes to accrue and report such excess as if
it were original issue discount in the  manner described above. It is not  clear
for  this purpose whether the assumed prepayment rate  that is to be used in the
case  of  a   Stripped  Certificateholder  other   than  an  original   Stripped
Certificateholder should be the Prepayment Assumption or a new rate based on the
circumstances at the date of subsequent purchase.
 
    PURCHASE  OF MORE THAN ONE CLASS OF STRIPPED CERTIFICATES.  When an investor
purchases more than one Class of Stripped Certificates, it is currently  unclear
whether  for federal income  tax purposes such  Classes of Stripped Certificates
should be treated separately or aggregated  for purposes of the rules  described
above.
 
    POSSIBLE  ALTERNATIVE  CHARACTERIZATIONS.    The  characterizations  of  the
Stripped Certificates discussed above are not the only possible  interpretations
of  the applicable Code provisions.  For example, the Stripped Certificateholder
may be treated as the owner of (i) one installment obligation consisting of such
Stripped Certificate's pro rata share of the payments attributable to  principal
on  each Mortgage  Loan and a  second installment obligation  consisting of such
Stripped Certificate's pro rata share  of the payments attributable to  interest
on  each Mortgage Loan, (ii) as many stripped bonds or stripped coupons as there
are scheduled payments of  principal and/or interest on  each Mortgage Loan,  or
(iii) a separate installment obligation for each Mortgage Loan, representing the
Stripped  Certificate's pro rata share of  payments of principal and/or interest
to be  made with  respect thereto.  Alternatively,  the holder  of one  or  more
Classes  of Stripped  Certificates may  be treated  as the  owner of  a pro rata
fractional undivided interest  in each  Mortgage Loan  to the  extent that  such
Stripped  Certificate,  or Classes  of Stripped  Certificates in  the aggregate,
represent the  same pro  rata portion  of principal  and interest  on each  such
Mortgage  Loan, and  a stripped bond  or stripped  coupon (as the  case may be),
treated as an installment obligation or contingent payment obligation, as to the
remainder. Final  regulations issued  on December  28, 1992  regarding  original
issue  discount on stripped obligations  make the foregoing interpretations less
likely to be applicable. The preamble to those regulations states that they  are
premised  on  the assumption  that an  aggregation  approach is  appropriate for
determining whether  original issue  discount  on a  stripped bond  or  stripped
coupon is DE MINIMIS, and solicits comments on appropriate rules for aggregating
stripped bonds and stripped coupons under Code Section 1286.
 
    Because of these possible varying characterizations of Stripped Certificates
and   the  resultant   differing  treatment  of   income  recognition,  Stripped
Certificateholders are urged  to consult  their own tax  advisors regarding  the
proper treatment of Stripped Certificates for federal income tax purposes.
 
REPORTING REQUIREMENTS AND BACKUP WITHHOLDING
 
    The  Master Servicer will furnish, within a reasonable time after the end of
each calendar year, to each  Certificateholder or Stripped Certificateholder  at
any  time during  such year, such  information (prepared on  the basis described
above) as  is  necessary to  enable  such Certificateholders  to  prepare  their
federal income tax returns. Such information will include the amount of original
issue   discount   accrued  on   Certificates   held  by   persons   other  than
Certificateholders exempted from the reporting requirements. The amount required
to be reported by the Master Servicer may  not be equal to the proper amount  of
original  issue  discount  required  to  be  reported  as  taxable  income  by a
Certificateholder, other than  an original Certificateholder  that purchased  at
the  issue price.  In particular, in  the case of  Stripped Certificates, unless
provided otherwise in the applicable Prospectus Supplement, such reporting  will
be  based upon a representative initial offering price of each Class of Stripped
Certificates. The Master Servicer  will also file  such original issue  discount
information with the
 
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Internal  Revenue Service.  If a Certificateholder  fails to  supply an accurate
taxpayer identification number or  if the Secretary  of the Treasury  determines
that  a  Certificateholder has  not reported  all  interest and  dividend income
required to be shown  on his federal income  tax return, 31% backup  withholding
may  be required in respect of any reportable payments, as described above under
"Federal Income Tax Consequences for REMIC Certificates -- Backup Withholding."
 
TAXATION OF CERTAIN FOREIGN INVESTORS
 
    To the extent that a Certificate evidences ownership in Mortgage Loans  that
are  issued on or before July 18, 1984, interest or original issue discount paid
by the  person required  to withhold  tax under  Code Section  1441 or  1442  to
nonresident  aliens, foreign  corporations, or other  non-U.S. persons ("foreign
persons") generally will  be subject to  30% United States  withholding tax,  or
such  lower rate as  may be provided  for interest by  an applicable tax treaty.
Accrued original issue discount recognized by the Certificateholder on the  sale
or  exchange of such a Certificate also will be subject to federal income tax at
the same rate.
 
    Treasury regulations provide that interest  or original issue discount  paid
by  the  Trustee  or other  withholding  agent  to a  foreign  person evidencing
ownership interest  in  Mortgage  Loans  issued after  July  18,  1984  will  be
"portfolio interest" and will be treated in the manner, and such persons will be
subject  to the same certification  requirements, described above under "Federal
Income Tax Consequences for  REMIC Certificates --  Taxation of Certain  Foreign
Investors -- Regular Certificates."
 
                              ERISA CONSIDERATIONS
 
GENERAL
 
    The  Employee Retirement Income Security Act  of 1974, as amended ("ERISA"),
imposes certain requirements on those employee benefit plans to which it applies
("Plans") and on those persons who  are fiduciaries with respect to such  Plans.
The  following  is  a  general  discussion  of  such  requirements,  and certain
applicable exceptions to and  administrative exemptions from such  requirements.
For  purposes of this discussion, a person  investing on behalf of an individual
retirement account established under Code Section 408 (an "IRA") is regarded  as
a fiduciary and the IRA as a Plan.
 
    Before purchasing any Certificates, a Plan fiduciary should consult with its
counsel  and determine  whether there  exists any  prohibition to  such purchase
under the requirements of ERISA, whether prohibited transaction exemptions  such
as  PTE 83-1  or any  individual administrative  exemption (as  described below)
applies, including whether the appropriate conditions set forth therein would be
met, or whether  any statutory prohibited  transaction exemption is  applicable,
and further should consult the applicable Prospectus Supplement relating to such
Series of Certificates.
 
CERTAIN REQUIREMENTS UNDER ERISA
 
    GENERAL.   In  accordance with  ERISA's general  fiduciary standards, before
investing in a Certificate a Plan fiduciary should determine whether to do so is
permitted under the governing Plan instruments  and is appropriate for the  Plan
in view of its overall investment policy and the composition and diversification
of  its  portfolio.  A  Plan  fiduciary  should  especially  consider  the ERISA
requirement of investment  prudence and  the sensitivity  of the  return on  the
Certificates  to the rate of principal repayments (including prepayments) on the
Mortgage Loans, as discussed in "Prepayment and Yield Considerations" herein.
 
    PARTIES IN INTEREST/DISQUALIFIED  PERSONS.  Other  provisions of ERISA  (and
corresponding  provisions of  the Code) prohibit  certain transactions involving
the assets of a Plan and persons who have certain specified relationships to the
Plan  (so-called  "parties  in  interest"   within  the  meaning  of  ERISA   or
"disqualified  persons" within the meaning of  the Code). The Seller, the Master
Servicer or Master Servicer or the  Trustee or certain affiliates thereof  might
be  considered or might  become "parties in  interest" or "disqualified persons"
with   respect   to   a    Plan.   If   so,    the   acquisition   or    holding
 
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<PAGE>
of Certificates by or on behalf of such Plan could be considered to give rise to
a  "prohibited transaction" within the  meaning of ERISA and  the Code unless an
administrative exemption described below or some other exemption is available.
 
    Special caution should be exercised before  the assets of a Plan  (including
assets  that may be held in an  insurance company's separate or general accounts
where assets in such accounts may be  deemed Plan assets for purposes of  ERISA)
are  used to purchase a Certificate if, with respect to such assets, the Seller,
the Master Servicer or  Master Servicer or the  Trustee or an affiliate  thereof
either:  (a) has  investment discretion with  respect to the  investment of such
assets of  such  Plan;  or (b)  has  authority  or responsibility  to  give,  or
regularly  gives, investment advice  with respect to  such assets for  a fee and
pursuant to  an agreement  or understanding  that such  advice will  serve as  a
primary basis for investment decisions with respect to such assets and that such
advice will be based on the particular investment needs of the Plan.
 
    DELEGATION  OF FIDUCIARY DUTY.   Further, if the assets  included in a Trust
Estate were  deemed to  constitute Plan  assets, it  is possible  that a  Plan's
investment in the Certificates might be deemed to constitute a delegation, under
ERISA,  of the duty to manage Plan assets by the fiduciary deciding to invest in
the Certificates,  and certain  transactions involved  in the  operation of  the
Trust  Estate might be deemed to  constitute prohibited transactions under ERISA
and the Code. Neither ERISA nor the Code define the term "plan assets."
 
    The U.S. Department of Labor (the "Department") has issued regulations  (the
"Regulations")  concerning whether  or not  a Plan's  assets would  be deemed to
include an interest  in the  underlying assets  of an  entity (such  as a  Trust
Estate)  for  purposes of  the reporting  and  disclosure and  general fiduciary
responsibility provisions of ERISA,  as well as  for the prohibited  transaction
provisions  of ERISA  and the  Code, if the  Plan acquires  an "equity interest"
(such as a Certificate) in such an entity.
 
    Certain exceptions  are provided  in the  Regulations whereby  an  investing
Plan's assets would be deemed merely to include its interest in the Certificates
instead  of being deemed to include an interest in the assets of a Trust Estate.
However, it  cannot be  predicted in  advance nor  can there  be any  continuing
assurance  whether such exceptions may be met,  because of the factual nature of
certain of the  rules set  forth in  the Regulations.  For example,  one of  the
exceptions  in the  Regulations states that  the underlying assets  of an entity
will not  be considered  "plan assets"  if less  than 25%  of the  value of  all
classes  of equity  interests are  held by  "benefit plan  investors," which are
defined as Plans,  IRAs, and employee  benefit plans not  subject to ERISA  (for
example,  governmental plans),  but this  exception is  tested immediately after
each acquisition  of an  equity  interest in  the  entity whether  upon  initial
issuance or in the secondary market.
 
ADMINISTRATIVE EXEMPTIONS
 
    INDIVIDUAL    ADMINISTRATIVE   EXEMPTIONS.       Several   underwriters   of
mortgage-backed securities  have  applied  for  and  obtained  ERISA  prohibited
transaction  exemptions (each, an  "Underwriter's Exemption") which  are in some
respects broader  than Prohibited  Transaction Class  Exemption 83-1  (described
below).  Such  exemptions can  only apply  to mortgage-backed  securities which,
among other  conditions, are  sold in  an offering  with respect  to which  such
underwriter  serves as the  sole or a  managing underwriter, or  as a selling or
placement agent. If  such an Underwriter's  Exemption might be  applicable to  a
Series  of Certificates, the applicable Prospectus Supplement will refer to such
possibility.
 
    Among the conditions that must  be satisfied for an Underwriter's  Exemption
to apply are the following:
 
       (1) The  acquisition of Certificates by a Plan is on terms (including the
           price for the  Certificates) that are  at least as  favorable to  the
    Plan  as they  would be  in an  arm's length  transaction with  an unrelated
    party;
 
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<PAGE>
       (2) The rights and  interests evidenced by  Certificates acquired by  the
           Plan  are not subordinated  to the rights  and interests evidenced by
    other Certificates of the Trust Estate;
 
       (3) The Certificates acquired by the Plan  have received a rating at  the
           time  of such  acquisition that is  one of the  three highest generic
    rating categories from either Standard  & Poor's ("S&P"), Moody's  Investors
    Service,  Inc. ("Moody's"), Duff & Phelps Credit Rating Co. ("DCR") or Fitch
    Investors Service, L.P. ("Fitch");
 
       (4) The Trustee  must not  be an  affiliate of  any other  member of  the
           Restricted Group (as defined below);
 
       (5) The  sum of all payments  made to and retained  by the underwriter in
           connection with the distribution of Certificates represents not  more
    than  reasonable compensation for underwriting  the Certificates. The sum of
    all payments made to and retained  by the Seller pursuant to the  assignment
    of  the Mortgage Loans to the Trust Estate represents not more than the fair
    market value of such  Mortgage Loans. The  sum of all  payments made to  and
    retained  by the Servicer (and any  other servicer) represents not more than
    reasonable compensation for  such person's  services under  the Pooling  and
    Servicing  Agreement and reimbursement of  such person's reasonable expenses
    in connection therewith; and
 
       (6) The Plan investing in the Certificates is an "accredited investor" as
           defined in  Rule 501(a)(1)  of  Regulation D  of the  Securities  and
    Exchange Commission under the Securities Act of 1933.
 
    The Trust Estate must also meet the following requirements:
 
              (i)
               the  assets of the Trust Estate  must consist solely of assets of
               the type that have been included in other investment pools in the
       marketplace;
 
             (ii)
               certificates in such other investment pools must have been  rated
               in  one of the  three highest rating  categories of S&P, Moody's,
       Fitch or DCR for at least one year prior to the Plan's acquisition of the
       Certificates; and
 
            (iii)
               certificates evidencing interests in such other investment  pools
               must  have been  purchased by investors  other than  Plans for at
       least one year prior to any Plan's acquisition of the Certificates.
 
    If the conditions to  an Underwriter's Exemption are  met, whether or not  a
Plan's  assets would be deemed to include  an ownership interest in the Mortgage
Loans  in  a  mortgage  pool,  the  acquisition,  holding  and  resale  of   the
Certificates by Plans would be exempt from the prohibited transaction provisions
of ERISA and the Code.
 
    Moreover,  an  Underwriter's  Exemption  can  provide  relief  from  certain
self-dealing/conflict of interest  prohibited transactions that  may occur if  a
Plan  fiduciary causes a Plan to acquire Certificates in a Trust Estate in which
the fiduciary (or its affiliate) is an obligor on the Mortgage Loans held in the
Trust Estate provided  that, among  other requirements: (i)  in the  case of  an
acquisition  in connection with  the initial issuance  of Certificates, at least
fifty percent of  each class  of Certificates in  which Plans  have invested  is
acquired  by  persons independent  of the  Restricted Group  and at  least fifty
percent of the  aggregate interest in  the Trust Estate  is acquired by  persons
independent  of the Restricted Group (as defined below); (ii) such fiduciary (or
its affiliate) is an obligor  with respect to five percent  or less of the  fair
market  value of  the Mortgage  Loans contained in  the Trust  Estate; (iii) the
Plan's investment  in Certificates  of  any Class  does not  exceed  twenty-five
percent  of all of the Certificates of that Class outstanding at the time of the
acquisition and (iv) immediately after the acquisition no more than  twenty-five
percent  of  the assets  of the  Plan with  respect  to which  such person  is a
fiduciary are invested in Certificates representing  an interest in one or  more
trusts containing assets sold or served by the same entity.
 
                                       95
<PAGE>
    An  Underwriter's Exemption does not apply to Plans sponsored by the Seller,
the underwriter specified  in the applicable  Prospectus Supplement, the  Master
Servicer,  the Trustee, the Servicer, any obligor with respect to Mortgage Loans
included in  the  Trust  Estate  constituting more  than  five  percent  of  the
aggregate  unamortized principal balance  of the assets in  the Trust Estate, or
any affiliate of such parties (the "Restricted Group").
 
    PTE  83-1.    Prohibited  Transaction  Class  Exemption  83-1  for   Certain
Transactions  Involving  Mortgage Pool  Investment  Trusts ("PTE  83-1") permits
certain transactions  involving the  creation,  maintenance and  termination  of
certain  residential mortgage pools  and the acquisition  and holding of certain
residential mortgage pool pass-through certificates by Plans, whether or not the
Plan's assets would be deemed to include an ownership interest in the  mortgages
in  such mortgage pools, and whether or not such transactions would otherwise be
prohibited under ERISA.
 
    The term "mortgage pool pass-through certificate" is defined in PTE 83-1  as
"a  certificate  representing a  beneficial undivided  fractional interest  in a
mortgage pool and  entitling the holder  of such a  certificate to  pass-through
payment  of principal and interest from the pooled mortgage loans, less any fees
retained by the pool sponsor."  It appears that, for  purposes of PTE 83-1,  the
term  "mortgage pool pass-through certificate" would include Certificates issued
in a single Class or in multiple Classes that evidence the beneficial  ownership
of  both a  specified percentage  of future  interest payments  (after permitted
deductions) and a specified percentage of  future principal payments on a  Trust
Estate.
 
    However,  it appears that PTE  83-1 does or might  not apply to the purchase
and holding of (a) Certificates that evidence the beneficial ownership only of a
specified percentage of future interest payments (after permitted deductions) on
a Trust Estate or only of a specified percentage of future principal payments on
a Trust Estate, (b) Residual Certificates, (c) Certificates evidencing ownership
interests in a Trust Estate which includes Mortgage Loans secured by multifamily
residential properties or shares issued by cooperative housing corporations,  or
(d) Certificates which are subordinated to other Classes of Certificates of such
Series.  Accordingly, unless exemptive relief other than PTE 83-1 applies, Plans
should not purchase any such Certificates.
 
    PTE 83-1 sets forth  "general conditions" and  "specific conditions" to  its
applicability.  Section  II  of  PTE  83-1  sets  forth  the  following  general
conditions to the application of the exemption: (i) the maintenance of a  system
of  insurance or other protection for the  pooled mortgage loans or the property
securing such loans, and for indemnifying certificateholders against  reductions
in  pass-through payments due  to property damage or  defaults in loan payments;
(ii) the  existence of  a pool  trustee  who is  not an  affiliate of  the  pool
sponsor;  and  (iii) a  requirement that  the sum  of all  payments made  to and
retained by the pool sponsor, and all  funds inuring to the benefit of the  pool
sponsor  as a result of the administration  of the mortgage pool, must represent
not more  than  adequate  consideration  for selling  the  mortgage  loans  plus
reasonable  compensation for services provided by  the pool sponsor to the pool.
The system  of insurance  or protection  referred to  in clause  (i) above  must
provide  such protection and indemnification  up to an amount  not less than the
greater of one percent of the  aggregate unpaid principal balance of the  pooled
mortgages  or the unpaid principal balance of  the largest mortgage in the pool.
It should be noted that in promulgating PTE 83-1 (and a predecessor  exemption),
the  Department did not have  under its consideration interests  in pools of the
exact nature as some of the Certificates described herein.
 
EXEMPT PLANS
 
    Employee benefit plans which are  governmental plans (as defined in  Section
3(32) of ERISA), and certain church plans (as defined in Section 3(33) of ERISA)
are  not subject to ERISA requirements and  assets of such plans may be invested
in Certificates without regard to  the ERISA considerations described above  but
such  plans may  be subject  to the provisions  of other  applicable federal and
state law.
 
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<PAGE>
UNRELATED BUSINESS TAXABLE INCOME -- RESIDUAL CERTIFICATES
 
    The purchase  of  a  Residual  Certificate  by  any  employee  benefit  plan
qualified  under Code Section 401(a) and exempt from taxation under Code Section
501(a), including most  varieties of ERISA  Plans, may give  rise to  "unrelated
business  taxable  income"  as  described in  Code  Sections  511-515  and 860E.
Further,  prior  to  the  purchase  of  Residual  Certificates,  a   prospective
transferee  may be required to  provide an affidavit to  a transferor that it is
not, nor is it purchasing a  Residual Certificate on behalf of, a  "Disqualified
Organization,"  which term as defined above includes certain tax-exempt entities
not subject to Code Section 511 such as certain governmental plans, as discussed
above under  the caption  "Certain Federal  Income Tax  Consequences --  Federal
Income   Tax  Consequences  for  REMIC  Certificates  --  Taxation  of  Residual
Certificates -- Tax-Related Restrictions on Transfer of Residual Certificates --
Disqualified Organizations."
 
    DUE TO THE COMPLEXITY OF THESE RULES AND THE PENALTIES IMPOSED UPON  PERSONS
INVOLVED IN PROHIBITED TRANSACTIONS, IT IS PARTICULARLY IMPORTANT THAT POTENTIAL
INVESTORS  WHO ARE  PLAN FIDUCIARIES  CONSULT WITH  THEIR COUNSEL  REGARDING THE
CONSEQUENCES UNDER ERISA OF THEIR ACQUISITION AND OWNERSHIP OF CERTIFICATES.
 
    THE SALE OF CERTIFICATES TO A PLAN IS IN NO RESPECT A REPRESENTATION BY  THE
SELLER  OR THE  APPLICABLE UNDERWRITER THAT  THIS INVESTMENT  MEETS ALL RELEVANT
LEGAL REQUIREMENTS  WITH  RESPECT  TO  INVESTMENTS BY  PLANS  GENERALLY  OR  ANY
PARTICULAR  PLAN, OR THAT THIS INVESTMENT  IS APPROPRIATE FOR PLANS GENERALLY OR
ANY PARTICULAR PLAN.
 
                                LEGAL INVESTMENT
 
    As will  be  specified  in the  applicable  Prospectus  Supplement,  certain
Classes  of  Certificates  will  constitute  "mortgage  related  securities" for
purposes of the Secondary Mortgage Market  Enhancement Act of 1984 ("SMMEA")  so
long  as they are rated in one of  the two highest rating categories by at least
one Rating Agency. As "mortgage related securities" such Classes will constitute
legal investments for persons, trusts, corporations, partnerships, associations,
business  trusts  and   business  entities   (including  but   not  limited   to
state-chartered  savings banks, commercial banks,  savings and loan associations
and insurance  companies, as  well  as trustees  and state  government  employee
retirement systems) created pursuant to or existing under the laws of the United
States  or of  any state  (including the District  of Columbia  and Puerto Rico)
whose authorized investments are subject to state regulation to the same  extent
that,  under applicable law, obligations issued by or guaranteed as to principal
and interest  by the  United States  or any  agency or  instrumentality  thereof
constitute  legal investments for such entities.  Pursuant to SMMEA, a number of
states enacted legislation, on  or before the October  3, 1991 cut-off for  such
enactments,  limiting to  varying extents  the ability  of certain  entities (in
particular, SMMEA insurance companies) to invest in mortgage related securities,
in most cases by requiring the  affected investors to rely solely upon  existing
state   law,  and  not  SMMEA.  Accordingly,  the  investors  affected  by  such
legislation will be authorized to invest in the Certificates only to the  extent
provided in such legislation.
 
    SMMEA  also amended  the legal  investment authority  of federally-chartered
depository institutions as  follows: federal savings  and loan associations  and
federal  savings  banks may  invest  in, sell  or  otherwise deal  with mortgage
related securities  without limitation  as  to the  percentage of  their  assets
represented  thereby,  federal  credit  unions may  invest  in  mortgage related
securities, and  national banks  may purchase  mortgage related  securities  for
their  own account  without regard  to the  limitations generally  applicable to
investment securities set forth  in 12 U.S.C. Section  24 (Seventh), subject  in
each case to such regulations as the applicable federal regulatory authority may
prescribe.  In  this connection,  federal credit  unions should  review National
Credit Union Administration ("NCUA") Letter to Credit Unions No. 96, as modified
by Letter to Credit Unions No. 108, which includes guidelines to assist  federal
credit  unions in making  investment decisions for  mortgage related securities.
The NCUA has adopted  rules, codified as 12  C.F.R. Section 703.5(f)-(k),  which
prohibit  federal  credit  unions  from investing  in  certain  mortgage related
securities (such as  the Residual Certificates  and the Stripped  Certificates),
except under limited circumstances.
 
                                       97
<PAGE>
    All  depository institutions  considering an investment  in the Certificates
should review the "Supervisory Policy Statement on Securities Activities"  dated
January  28, 1992,  as revised  April 15, 1994  (the "Policy  Statement") of the
Federal Financial Institutions Examination Council. The Policy Statement,  which
has  been adopted by the  Board of Governors of  the Federal Reserve System, the
Federal Deposit Insurance Corporation, the  Comptroller of the Currency and  the
Office  of  Thrift Supervision  and by  the  NCUA (with  certain modifications),
prohibits depository institutions from investing in certain "high-risk  mortgage
securities"  (including securities  such as  certain Series  and Classes  of the
Certificates), except  under  limited  circumstances,  and  sets  forth  certain
investment practices deemed to be unsuitable for regulated institutions.
 
    Institutions  whose  investment  activities  are  subject  to  regulation by
federal or  state  authorities  should review  rules,  policies  and  guidelines
adopted  from time  to time  by such  authorities before  purchasing any  of the
Certificates, as certain  Series or Classes  (in particular, Certificates  which
are  entitled  solely or  disproportionately  to distributions  of  principal or
interest) may be deemed unsuitable investments, or may otherwise be  restricted,
under  such rules, policies or guidelines  (in certain instances irrespective of
SMMEA).
 
    The  foregoing  does  not  take  into  consideration  the  applicability  of
statutes,   rules,  regulations,  orders,  guidelines  or  agreements  generally
governing investments made by a particular investor, including, but not  limited
to, "prudent investor" provisions, percentage-of-assets limits, provisions which
may   restrict   or   prohibit   investment   in   securities   which   are  not
"interest-bearing" or  "income-paying," and,  with  regard to  any  Certificates
issued in book-entry form, provisions which may restrict or prohibit investments
in securities which are issued in book-entry form.
 
    Except  as to  the status  of certain  Classes of  Certificates as "mortgage
related securities," no representation is made as to the proper characterization
of  the  Certificates  for  legal  investment  purposes,  financial  institution
regulatory  purposes,  or other  purposes, or  as to  the ability  of particular
investors  to   purchase   Certificates  under   applicable   legal   investment
restrictions.  The  uncertainties described  above  (and any  unfavorable future
determinations concerning legal investment  or financial institution  regulatory
characteristics  of the Certificates) may adversely  affect the liquidity of the
Certificates.
 
    All investors should consult  with their own  legal advisors in  determining
whether  and to  what extent the  Certificates constitute  legal investments for
such investors.
 
                              PLAN OF DISTRIBUTION
 
    The Certificates are being offered hereby  in Series through one or more  of
the  methods  described below.  The  applicable Prospectus  Supplement  for each
Series will describe the method of  offering being utilized for that Series  and
will  state the public offering or purchase  price of each Class of Certificates
of such Series, or the method by which  such price is to be determined, and  the
net proceeds to the Seller from such sale.
 
    The  Certificates will be offered through the following methods from time to
time and  offerings may  be made  concurrently through  more than  one of  these
methods  or  an offering  of a  particular  Series of  Certificates may  be made
through a combination of two or more of these methods:
 
       1.  By negotiated firm commitment underwriting and public re-offering  by
           underwriters specified in the applicable Prospectus Supplement;
 
       2.  By placements by the Seller with investors through dealers; and
 
       3.  By direct placements by the Seller with investors.
 
    If  underwriters are used  in a sale of  any Certificates, such Certificates
will be acquired by  the underwriters for  their own account  and may be  resold
from   time  to  time   in  one  or   more  transactions,  including  negotiated
transactions, at  a fixed  public offering  price  or at  varying prices  to  be
determined  at the  time of  sale or  at the  time of  commitment therefor. Firm
commitment underwriting and public
 
                                       98
<PAGE>
reoffering by  underwriters  may  be done  through  underwriting  syndicates  or
through  one or  more firms acting  alone. The specific  managing underwriter or
underwriters, if any, with respect to the offer and sale of a particular  Series
of  Certificates will  be set  forth on the  cover of  the Prospectus Supplement
applicable to such Series and the members of the underwriting syndicate, if any,
will be  named in  such Prospectus  Supplement. The  Prospectus Supplement  will
describe  any discounts and commissions  to be allowed or  paid by the Seller to
the underwriters, any other items constituting underwriting compensation and any
discounts and commissions to be allowed or paid to the dealers. The  obligations
of  the  underwriters  will  be subject  to  certain  conditions  precedent. The
underwriters with  respect  to a  sale  of any  Class  of Certificates  will  be
obligated  to purchase all  such Certificates if any  are purchased. The Seller,
and, if specified  in the  applicable Prospectus  Supplement, Norwest  Mortgage,
will  indemnify the  applicable underwriters against  certain civil liabilities,
including liabilities under the Securities Act.
 
    The Prospectus Supplement with respect to any Series of Certificates offered
other than through underwriters will contain information regarding the nature of
such offering  and any  agreements to  be entered  into between  the Seller  and
dealers and/or the Seller and purchasers of Certificates of such Series.
 
    Purchasers  of Certificates, including dealers,  may, depending on the facts
and circumstances of such purchases, be  deemed to be "underwriters" within  the
meaning  of the Securities Act in connection  with reoffers and sales by them of
Certificates. Certificateholders  should consult  with their  legal advisors  in
this regard prior to any such reoffer or sale.
 
    If   specified  in  the  Prospectus  Supplement  relating  to  a  Series  of
Certificates, the Seller or  any affiliate thereof may  purchase some or all  of
one  or more  Classes of  Certificates of  such Series  from the  underwriter or
underwriters at a price  specified or described  in such Prospectus  Supplement.
Such purchaser may thereafter from time to time offer and sell, pursuant to this
Prospectus,  some or all of such Certificates so purchased directly, through one
or more  underwriters to  be designated  at the  time of  the offering  of  such
Certificates  or through dealers acting as agent and/or principal. Such offering
may be restricted in  the matter specified in  such Prospectus Supplement.  Such
transactions may be effected at market prices prevailing at the time of sale, at
negotiated prices or at fixed prices. The underwriters and dealers participating
in  such purchaser's offering  of such Certificates  may receive compensation in
the form of underwriting discounts or  commissions from such purchaser and  such
dealers  may receive commissions from the investors purchasing such Certificates
for whom they may act as agent  (which discounts or commissions will not  exceed
those  customary  in  those types  of  transactions involved).  Any  dealer that
participates in the  distribution of such  Certificates may be  deemed to be  an
"underwriter"  within the meaning of the Securities Act, and any commissions and
discounts received  by  such  dealer  and  any profit  on  the  resale  of  such
Certificates  by such  dealer might be  deemed to be  underwriting discounts and
commissions under the Securities Act.
 
                                USE OF PROCEEDS
 
    The net proceeds from the sale of  each Series of Certificates will be  used
by  the  Seller  for the  purchase  of  the Mortgage  Loans  represented  by the
Certificates of such Series from Norwest  Mortgage. It is expected that  Norwest
Mortgage will use the proceeds from the sale of the Mortgage Loans to the Seller
for   its  general   business  purposes,  including,   without  limitation,  the
origination or acquisition of new mortgage loans and the repayment of borrowings
incurred to finance the origination or acquisition of mortgage loans,  including
the Mortgage Loans underlying the Certificates of such Series.
 
                                 LEGAL MATTERS
 
    Certain  legal  matters, including  the federal  income tax  consequences to
Certificateholders of an  investment in the  Certificates of a  Series, will  be
passed upon for the Seller by Cadwalader, Wickersham & Taft, New York.
 
                                       99
<PAGE>
                                     RATING
 
    It  is a condition to the issuance of the Certificates of any Series offered
pursuant to this Prospectus  and a Prospectus Supplement  that they be rated  in
one of the four highest categories by at least one Rating Agency.
 
    A  securities rating is not a recommendation to buy, sell or hold securities
and may be subject to revision or withdrawal at any time by the assigning Rating
Agency. Each securities rating  should be evaluated  independently of any  other
rating.
 
                                      100
<PAGE>
                        INDEX OF SIGNIFICANT DEFINITIONS
 
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
<S>                                                                                                        <C>
Accrual Certificates.....................................................................................         35
Act......................................................................................................          2
Advances.................................................................................................         46
ALTA.....................................................................................................         25
Balloon Loan.............................................................................................         19
Balloon Period...........................................................................................         19
Bankruptcy Code..........................................................................................         62
Bankruptcy Loss..........................................................................................         37
Bankruptcy Loss Amount...................................................................................         37
Beneficial Owner.........................................................................................         32
Book-Entry Certificates..................................................................................         11
Buy-Down Fund............................................................................................         18
Buy-Down Loans...........................................................................................         18
Cede.....................................................................................................         32
CERCLA...................................................................................................         63
Certificate Account......................................................................................         43
Certificateholder........................................................................................         32
Certificates.............................................................................................      cover
Class....................................................................................................      cover
Cleanup Costs............................................................................................         63
Code.....................................................................................................         11
Commission...............................................................................................          2
Correspondents...........................................................................................         20
Credit Score.............................................................................................         22
DCR......................................................................................................         95
Deferred Interest........................................................................................         17
Definitive Certificates..................................................................................         11
Delegated Underwriting...................................................................................         21
Department...............................................................................................         94
Depository...............................................................................................         43
Detailed Information.....................................................................................          2
Disqualified Organization................................................................................         81
Distribution Date........................................................................................          9
DTC......................................................................................................         11
DTC Participants.........................................................................................         32
Due Date.................................................................................................         16
Due on Sale..............................................................................................         64
EDGAR....................................................................................................          2
Eligible Custodial Account...............................................................................         44
ERISA....................................................................................................         11
Excess Bankruptcy Losses.................................................................................         37
Excess Fraud Losses......................................................................................         37
Excess Special Hazard Losses.............................................................................         37
FDIC.....................................................................................................         44
FHLBB....................................................................................................         65
FHLMC....................................................................................................         25
Fitch....................................................................................................         95
Fixed Retained Yield.....................................................................................         35
FNMA.....................................................................................................         25
Fraud Loss...............................................................................................         37
</TABLE>
 
                                      101
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
Fraud Loss Amount........................................................................................         37
<S>                                                                                                        <C>
Garn Act.................................................................................................         65
GEMICO...................................................................................................         25
Indirect DTC Participants................................................................................         32
IRA......................................................................................................         93
Joint Ventures...........................................................................................         20
Liquidation Proceeds.....................................................................................         44
Loan Stores..............................................................................................         20
Master Servicer..........................................................................................      cover
Master Servicing Fee.....................................................................................         35
Moody's..................................................................................................         95
Mortgage Interest Rate...................................................................................         35
Mortgage Loans...........................................................................................      cover
Mortgage Notes...........................................................................................         15
Mortgaged Properties.....................................................................................         15
Mortgages................................................................................................         15
NASCOR...................................................................................................      cover
NCUA.....................................................................................................         98
Net Foreclosure Profits..................................................................................         35
1986 Act.................................................................................................         69
Non-Pro Rata Certificate.................................................................................         70
Non-U.S. Person..........................................................................................         85
Norwest Bank.............................................................................................      cover
Norwest Corporation......................................................................................         19
Norwest Funding..........................................................................................         19
Norwest Mortgage.........................................................................................      cover
Norwest Mortgage Loan....................................................................................         19
Norwest Mortgage Sale Agreement..........................................................................         53
OID Regulations..........................................................................................         70
Other Advances...........................................................................................         46
OTS......................................................................................................         65
Partial Liquidation Proceeds.............................................................................         34
Pass-Through Rate........................................................................................          9
Pass-Through Entity......................................................................................         81
Paying Agent.............................................................................................         46
Percentage Interest......................................................................................         34
Periodic Advances........................................................................................         10
PHMC.....................................................................................................         19
PHMC Mortgage Loans......................................................................................         19
Plans....................................................................................................         93
Policy Statement.........................................................................................         98
Pool Distribution Amount.................................................................................         34
Pool Insurers............................................................................................         25
Pooling and Servicing Agreement..........................................................................          8
Prepayment Assumption....................................................................................         71
Program Loans............................................................................................         42
Proposed Mark to Market Regulations......................................................................         83
PTE 83-1.................................................................................................         96
Qualified Mortgage.......................................................................................         30
Rating Agency............................................................................................         12
Record Date..............................................................................................         10
Regular Certificateholder................................................................................         69
</TABLE>
 
                                      102
<PAGE>
<TABLE>
<CAPTION>
TERM                                                                                                            PAGE
- ---------------------------------------------------------------------------------------------------------  ---------
Regular Certificates.....................................................................................         31
<S>                                                                                                        <C>
Regulations..............................................................................................         94
Relief Act...............................................................................................         63
REMIC....................................................................................................      cover
REMIC Certificates.......................................................................................         67
REMIC Pool...............................................................................................         67
REMIC Regulations........................................................................................         67
Remittance Date..........................................................................................         44
Reserve Fund.............................................................................................         38
Residual Certificates....................................................................................         31
Residual Holders.........................................................................................         76
Restricted Group.........................................................................................         96
Rules....................................................................................................         32
S&P......................................................................................................         95
Securities Act...........................................................................................          2
Seller...................................................................................................      cover
Senior Certificates......................................................................................      cover
Series...................................................................................................      cover
Servicer.................................................................................................      cover
Servicer Custodial Account...............................................................................         44
Servicing Account........................................................................................         47
Servicing Fee............................................................................................         35
SMMEA....................................................................................................         97
Special Hazard Loss......................................................................................         37
Special Hazard Loss Amounts..............................................................................         37
Standard Hazard Insurance Policy.........................................................................         49
Startup Day..............................................................................................         68
Stripped Certificateholder...............................................................................         91
Stripped Certificates....................................................................................         90
Subclass.................................................................................................      cover
Subordinated Certificates................................................................................      cover
Subsidy Account..........................................................................................         17
Subsidy Loans............................................................................................         17
Subsidy Payments.........................................................................................         17
Superlien................................................................................................         64
Title V..................................................................................................         66
T.O.P. Loans.............................................................................................         25
Treasury Regulations.....................................................................................         54
Trust Estate.............................................................................................      cover
Trustee..................................................................................................         59
Trustee Fee..............................................................................................         35
U.S. Person..............................................................................................         82
UCC......................................................................................................         61
UGRIC....................................................................................................         25
Underlying Servicing Agreement...........................................................................          8
Underwriter's Exemption..................................................................................         95
Voting Interests.........................................................................................         56
Window Period............................................................................................         65
Window Period Loans......................................................................................         65
Window Period States.....................................................................................         65
</TABLE>
 
                                      103
<PAGE>
- ---------------------------------------------------------
                       ---------------------------------------------------------
- ---------------------------------------------------------
                       ---------------------------------------------------------
 
    NO  DEALER, SALESMAN  OR ANY  OTHER PERSON HAS  BEEN AUTHORIZED  TO GIVE ANY
INFORMATION OR  TO MAKE  ANY 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-73
Delinquency and Foreclosure
  Experience......................................       S-83
Prepayment and Yield Considerations...............       S-89
Pooling and Servicing Agreement...................      S-101
Servicing of the Mortgage Loans...................      S-103
Federal Income Tax Considerations.................      S-107
ERISA Considerations..............................      S-109
Legal Investment..................................      S-110
Secondary Market..................................      S-111
Underwriting......................................      S-112
Legal Matters.....................................      S-113
Experts...........................................      S-113
Use of Proceeds...................................      S-113
Ratings...........................................      S-114
Index of Significant Prospectus Supplement
  Definitions.....................................      S-115
 
                         PROSPECTUS
Reports...........................................          2
Additional Information............................          2
Additional Detailed Information...................          2
Incorporation of Certain Information by
  Reference.......................................          3
Table of Contents.................................          4
Summary of Prospectus.............................          8
Risk Factors......................................         13
The Trust Estates.................................         15
The Seller........................................         19
Norwest Mortgage..................................         19
Norwest Bank......................................         20
The Mortgage Loan Programs........................         20
Description of the Certificates...................         30
Prepayment and Yield Considerations...............         39
Servicing of the Mortgage Loans...................         41
Certain Matters Regarding the Master Servicer.....         52
The Pooling and Servicing Agreement...............         53
Certain Legal Aspects of the Mortgage Loans.......         59
Certain Federal Income Tax Consequences...........         66
ERISA Considerations..............................         93
Legal Investment..................................         97
Plan of Distribution..............................         98
Use of Proceeds...................................         99
Legal Matters.....................................         99
Rating............................................        100
Index of Significant Definitions..................        101
</TABLE>
 
                                     [LOGO]
 
                                  $408,871,000
                                 (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 D. JONES & CO.
 
                                 July 16, 1996
 
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