GE CAPITAL MORTGAGE SERVICES INC
424B5, 1999-03-26
ASSET-BACKED SECURITIES
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<PAGE>   1
                                               Filed Pursuant to Rule 424(b)(5)
                                               Registration No. 333-68951
 
PROSPECTUS SUPPLEMENT
(TO PROSPECTUS DATED MARCH 12, 1999)
 
                GE CAPITAL MORTGAGE SERVICES, INC. 1999-3 TRUST
 
                                     Issuer
 
                       GE CAPITAL MORTGAGE SERVICES, INC.
 
                             Depositor and Servicer
 
                                  $494,623,500
                                 (Approximate)
 
            REMIC MORTGAGE PASS-THROUGH CERTIFICATES, SERIES 1999-3
        PRINCIPAL AND INTEREST PAYABLE MONTHLY, BEGINNING APRIL 26, 1999
 
                          THE TRUST WILL ISSUE:
 
                               - 18 classes of Class A senior certificates;
                               - 6 classes of junior certificates; and
                               - 1 class of residual certificates.
 
For a description of the classes of certificates offered by this prospectus
supplement, see "Securities Offered" on page S-3.
 
The assets of the trust will include a pool of conventional, fixed-rate,
first-lien, fully-amortizing, one- to four-family residential mortgage loans.
The stated maturities of the mortgage loans will range from 20 to 30 years.
 
                           -------------------------
 
CONSIDER CAREFULLY THE RISK FACTORS BEGINNING ON PAGE S-8 OF THIS PROSPECTUS
SUPPLEMENT.
 
                           -------------------------
 
NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR PASSED UPON THE
ADEQUACY OR ACCURACY OF THIS PROSPECTUS SUPPLEMENT. ANY REPRESENTATION TO THE
CONTRARY IS A CRIMINAL OFFENSE.
 
Salomon Smith Barney Inc. will purchase the senior certificates and PaineWebber
Incorporated will purchase the junior certificates offered by this prospectus
supplement. These underwriters will sell the certificates to investors at
varying prices determined at the time of sale. The proceeds to the depositor
from the sale of the offered certificates will be approximately 99.4419287% of
the total principal balance of those certificates plus accrued interest, before
deducting expenses. Each underwriter's commission will be the difference between
the price it pays for the certificates and the amount it receives from their
sale to the public. The certificates will be available for delivery to investors
on or about March 25, 1999.
                           -------------------------
SALOMON SMITH BARNEY                                    PAINEWEBBER INCORPORATED

THE DATE OF THIS PROSPECTUS SUPPLEMENT IS MARCH 23, 1999.
<PAGE>   2
 
IMPORTANT NOTICE ABOUT INFORMATION PRESENTED IN THIS
 
PROSPECTUS SUPPLEMENT AND THE ACCOMPANYING PROSPECTUS
 
     We provide information to you about the certificates offered by this
prospectus supplement and the underlying trust in two separate documents: (1)
the accompanying prospectus, which provides general information, some of which
may not apply to your certificates or trust, and (2) this prospectus supplement,
which describes the specific terms of your certificates and the assets in your
trust. You should read both of these documents together.
 
     This prospectus supplement will supplement and enhance the disclosure in
the prospectus for purposes of your certificates.
 
                                       S-2
<PAGE>   3
 
SUMMARY OF TERMS
 
     This summary highlights selected information from this document and does
not contain all of the information that you need to consider in making your
investment decision. This summary contains an overview of certain concepts and
other information to aid your understanding. All of the information contained in
this summary is qualified by the more detailed explanation described in other
parts of this prospectus supplement and the accompanying prospectus.
 
THE ISSUER
 
     The issuer of the certificates will be GE Capital Mortgage Services, Inc.
1999-3 Trust. The trust was created for the sole purpose of issuing the
certificates.
 
     We will sell the mortgage loans underlying the certificates to the trust.
 
SECURITIES OFFERED
 
     The total original principal balance of the certificates will be
approximately $500,082,531. The following table shows the approximate initial
principal balance, annual certificate interest rate and minimum denomination of
each class of certificates offered by this prospectus supplement:
 
<TABLE>
<CAPTION>
                                 CLASS CERTIFICATE       CERTIFICATE         MINIMUM
                                PRINCIPAL BALANCE(1)    INTEREST RATE      DENOMINATION
SENIOR CERTIFICATES             --------------------    -------------      ------------
<S>                             <C>                     <C>                <C>
Class A1......................      $134,000,000            6.50%            $ 25,000
Class A2......................         5,456,000            6.50               25,000
Class A3......................        21,053,083             (2)               25,000
Class A4......................         8,475,917             (2)               25,000
Class A5......................        50,000,000            6.50               25,000
Class A6......................         3,000,000            6.50                1,000
Class A7......................         3,000,000            6.50                1,000
Class A8......................         2,000,000            6.50                1,000
Class A9......................         2,000,000            6.50                1,000
Class A10.....................         2,461,000            6.75                1,000
Class A11.....................         1,968,000            6.75                1,000
Class A12.....................         1,968,000            6.75                1,000
Class A13.....................         1,968,000            6.75                1,000
Class A14.....................         1,478,000            6.75                1,000
Class A15.....................       127,000,000            6.50               25,000
Class A16.....................        76,424,000            6.50               25,000
Class A17.....................        12,119,000            6.50               25,000
Class A18.....................        25,000,000            6.50               25,000
RESIDUAL CERTIFICATES
Class R.......................               100            6.50                  100
</TABLE>
 
                         (table continues on next page)
                                       S-3
<PAGE>   4
 
<TABLE>
<CAPTION>
                                 CLASS CERTIFICATE       CERTIFICATE         MINIMUM
                                PRINCIPAL BALANCE(1)    INTEREST RATE      DENOMINATION
JUNIOR CERTIFICATES             --------------------    -------------      ------------
<S>                             <C>                     <C>                <C>
Class M.......................      $  9,251,500            6.50%            $100,000
Class B1......................         3,750,600            6.50              100,000
Class B2......................         2,250,300            6.50              100,000
</TABLE>
 
- -------------------------
(1) Approximate, subject to adjustment as described in this prospectus
    supplement.
 
(2) The Class A3 and Class A4 Certificates will accrue interest at the floating
    rates described in this prospectus supplement. You should refer to
    "Description of the Certificates -- Distributions on the
    Certificates -- Interest" for a description of these rates.
 
     The Class A1 through Class A18 Certificates, Class R, Class PO and Class S
Certificates are the senior certificates. The Class M and the Class B1 through
Class B5 Certificates are the junior certificates.
 
     The Class PO, Class S, Class B3, Class B4 and Class B5 Certificates are not
offered by this prospectus supplement. We will initially retain the Class PO and
the Class S Certificates but may sell them later.
 
     Depending on the final composition of the pool of mortgage loans sold to
the trust, the principal balance of each class of certificates may increase or
decrease from the amount listed above. The total original principal balance of
the certificates will not be less than $475,000,000 or greater than
$525,000,000.
 
     Certificates with principal balances in excess of the minimum denominations
shown in the table above will be issued in multiples of $1,000 above the minimum
denomination. The Class R Certificates will be issued as a single certificate.
 
THE MORTGAGE LOANS
 
     We originated or acquired all of the mortgage loans. The mortgage loans
expected to be sold to the trust have the following characteristics as of March
1, 1999:
 
<TABLE>
<S>                                       <C>
- - Total original principal balance(1):    $500,082,531
- - Original terms to maturity:             20 to 30 years
- - Weighted average maturity:              between 355 and 357 months
- - Weighted average annual interest rate:  between 7.15% and 7.19%
- - Largest geographic concentration:       no more than 50% of the mortgage
                                          loans are secured by properties
                                          located in California
</TABLE>
 
- -------------------------
 
(1) Approximate, after deducting payments of principal due or received on or
    before March 1, 1999, and subject to the variance described in this
    prospectus supplement.
                                       S-4
<PAGE>   5
 
THE SERVICER
 
     We will directly service approximately 92% of the mortgage loans in the
trust and will supervise the servicing of the remainder of the mortgage loans by
third party servicers.
 
     As servicer, we must make reasonable efforts to collect payments due on the
mortgage loans. In addition, we must advance delinquent payments on mortgage
loans to the extent described in this prospectus supplement. We will reduce our
servicing compensation, to the extent described in this prospectus supplement,
to reimburse certificateholders for shortfalls of interest payments.
 
     You should refer to "GE Capital Mortgage Services, Inc." and "The Pooling
and Servicing Agreement -- Servicing Arrangement with Respect to the Mortgage
Loans" and "-- Servicing Compensation, Compensating Interest and Payment of
Expenses" in this prospectus supplement.
 
DISTRIBUTIONS ON THE CERTIFICATES
 
     The trustee will make distributions on the certificates on the 25th day of
each month. If the 25th is not a business day, the trustee will make
distributions on the next business day. The first distribution date will be
April 26, 1999.
 
     On each distribution date, the trustee will first pay to the senior
certificates the amounts of interest and principal distributable to them from
available funds. The trustee will then pay interest and principal to the junior
certificates from the remaining available funds.
 
INTEREST PAYMENTS
 
     - The actual amount of interest you receive on your certificates on each
       distribution date will depend on:
 
      -- the amount of interest accrued on your certificates;
 
      -- the total amount of funds available for distribution; and
 
      -- the amount of any accrued interest not paid on earlier distribution
         dates.
 
     - If you are the holder of a senior certificate entitled to interest
       payments, the amount of interest payable to you will be in proportion to
       the interest payable on all of the senior certificates together. All of
       the senior certificates entitled to interest payments will receive these
       payments at the same time.
 
     - If you are the holder of a junior certificate, you will receive interest
       payments only after the trustee has paid interest and principal to:
 
      -- all of the senior certificates, and
 
      -- each class of junior certificates that ranks higher to your
         certificates.
 
     - The trustee will calculate interest on the basis of a 360-day year
       consisting of twelve 30-day months.
 
PRINCIPAL PAYMENTS
 
     - After interest payments have been made on all senior certificates
       entitled to interest, each class of senior certificates -- other than the
       Class S Certificates -- will also receive a payment of principal. You
       should refer to "Description of the
                                       S-5
<PAGE>   6
 
       Certificates -- Distribution on the Certificates" for a description of
       the amount of principal payable to you and the priority in which it will
       be paid.
 
     - The amount of principal you receive on your certificates will depend on:
 
      -- the various formulas described in this prospectus supplement that
         determine the allocation of principal payments to your certificates;
         and
 
      -- the amounts actually available for distribution as principal.
 
     - Because of the principal allocation formulas described in this prospectus
       supplement, the senior certificates -- other than the Class PO and the
       Class S Certificates -- will receive principal payments at a faster rate
       than the junior certificates for at least the first nine years after
       issuance of the certificates. The Class A5 Certificates will not benefit
       from this accelerated repayment. You should refer to "Description of the
       Certificates -- Distributions on the Certificates -- Allocation of
       Available Funds."
 
OPTIONAL TERMINATION
 
     We will have the option to repurchase all the mortgage loans and thereby
effect the early retirement of the certificates when the aggregate principal
balance of the mortgage loans is less than 10% of the aggregate principal
balance of the mortgage loans as of March 1, 1999. See "The Pooling and
Servicing Agreement -- Optional Termination" in this prospectus supplement.
 
CREDIT ENHANCEMENT
 
     Your certificates will benefit from credit enhancement in the form of
subordination. The subordination of the junior certificates will benefit the
senior certificates in two ways:
 
     - The senior certificates will have a preferential right over the junior
       certificates to receive funds available for distribution.
 
     - The junior certificates will absorb all losses on the mortgage loans up
       to the level described in this prospectus supplement.
 
     If you are the holder of a senior certificate, you should keep in mind,
however, that the subordination of the junior certificates offers only limited
protection against the loss of your investment. See the risk factor on page
S-10.
 
FEDERAL INCOME TAX CONSEQUENCES
 
     The trust will be treated as a single REMIC for federal income tax
purposes. As a result, the certificates other than the Class R Certificates will
be treated as regular interests in the REMIC, and the Class R Certificates will
be treated as residual interests in the REMIC. All of the regular interest
certificates will be treated as debt for tax purposes. In addition, unless you
are the holder of the Class R Certificates, you will be required to report
income on your certificates under the accrual method of accounting. Under the
accrual method of accounting, you may be required to report income for federal
income tax purposes in advance of receiving a corresponding cash distribution.
                                       S-6
<PAGE>   7
 
     The particular federal income tax consequences of your investment will
depend upon the class of certificates you buy. You should consider carefully the
tax consequences of an investment in the following classes of certificates:
 
     - the Class R Certificates, which will be subject to special rules that
       could significantly reduce their after-tax yield;
 
     - the junior certificates, whose reported income may exceed the amount of
       cash actually received; and
 
     - certain classes of certificates which may be issued with original issue
       discount.
 
     You should refer to "Federal Income Tax Consequences" in this prospectus
supplement and "Federal Income Tax Consequences -- REMIC Certificates" in the
accompanying prospectus to determine the tax consequences to you of an
investment in the certificates.
 
LEGAL INVESTMENT
 
     The senior certificates and the Class M Certificates will be "mortgage
related securities" for purposes of the Secondary Mortgage Market Enhancement
Act of 1984 for so long as they satisfy the criteria described in "Legal
Investment Matters" in this prospectus supplement. No other certificates will be
mortgage related securities. You should consult your own legal advisors to
determine whether, and to what extent, you can invest in senior certificates and
the Class M Certificates. See "Legal Investment Matters" in this prospectus
supplement and in the accompanying prospectus for important information
concerning possible restrictions on the ownership of the certificates by
regulated institutions.
 
ERISA CONSIDERATIONS
 
     If you are investing the assets of an employee benefit plan that is subject
to ERISA or to Section 4975 of the federal income tax code, you may not acquire
the Class M, Class B1, Class B2 and Class R Certificates. In addition, you
should consider carefully the information presented in "ERISA Considerations" in
this prospectus supplement and in the accompanying prospectus.
 
CERTIFICATE RATINGS
 
     The certificates must receive the ratings indicated under "Certificate
Ratings" from Fitch IBCA and/or Standard and Poor's Ratings Services at the time
of their initial issuance. You should refer to "Certificate Ratings" in this
prospectus supplement to learn more about the significance and limitation of
ratings.
                                       S-7
<PAGE>   8
 
RISK FACTORS
 
AN INVESTMENT IN THE
CERTIFICATES MAY NOT BE
SUITABLE FOR YOU                    The certificates are not suitable
                                    investments for all investors. In
                                    particular, you should not purchase any
                                    class of offered certificates unless you
                                    understand the prepayment, credit, liquidity
                                    and market risks associated with that class.
 
                                    The certificates are complex securities. You
                                    should possess, either alone or together
                                    with an investment advisor, the expertise
                                    necessary to evaluate the information
                                    contained in this prospectus supplement and
                                    the accompanying prospectus in the context
                                    of your financial situation and tolerance
                                    for risk.
 
                                    You should carefully consider, among other
                                    things, the factors described below before
                                    purchasing the certificates.
 
LOSSES AND DELINQUENT PAYMENTS ON
THE MORTGAGE LOANS MAY REDUCE THE
YIELD ON YOUR CERTIFICATES          Payments on the mortgage loans will not be
                                    insured by the government or any other
                                    person. Moreover, we, as servicer, have a
                                    limited obligation to make advances for
                                    delinquent installments of principal or
                                    interest, as described in "The Pooling and
                                    Servicing Agreement -- Advances."
                                    Consequently, the certificates will absorb
                                    the losses resulting from delinquent
                                    payments, and the yield on your certificates
                                    could be lower than you expect.
 
                                    In addition, if you are buying a class of
                                    certificates that ranks junior to another
                                    class of certificates, you will be more
                                    likely than the holder of a certificate
                                    senior to you to experience losses as a
                                    result of payment defaults or liquidation
                                    losses on the underlying mortgage loans.
                                    This is because payment defaults and
                                    liquidation losses are first allocated to
                                    junior certificates, as described in
                                    "Description of the
                                    Certificates -- Allocation of Realized
                                    Losses on the Certificates" and "--
                                    Distributions on the
                                    Certificates -- Allocation of Available
                                    Funds" in this prospectus supplement.
 
WE CANNOT GUARANTEE YOU REGULAR
PAYMENTS ON YOUR CERTIFICATES       The amounts you receive on your certificates
                                    will depend on the amount of the payments
                                    borrowers make on the mortgage loans.
                                    Because we cannot predict the rate at which
                                    borrowers will repay their loans, you may
                                    receive distributions on your certificates
                                    in amounts that are larger or smaller than
                                    you expect. In addition, the life of your
                                    certificates may be longer or shorter than
                                    anticipated. Because of this, we cannot
                                    guarantee that
 
                                       S-8
<PAGE>   9
 
                                    you will receive distributions at any
                                    specific future date or in any specific
                                    amount.
 
PREPAYMENT RATES THAT ARE
FASTER OR SLOWER THAN YOU EXPECT
MAY REDUCE THE YIELD ON
YOUR CERTIFICATES                   The yield to maturity on your certificates
                                    will depend primarily on the purchase price
                                    of your certificates and the rate of
                                    principal payments on the mortgage loans in
                                    the trust. Unexpected changes in prepayment
                                    rates could have the following negative
                                    effects:
 
                                         - If you bought your certificates for
                                           more than their face amount, the
                                           yield on your certificates will drop
                                           if principal payments occur at a rate
                                           faster than you expect.
 
                                         - If you bought your certificates for
                                           less than their face amount, the
                                           yield on your certificates will drop
                                           if principal payments occur at a rate
                                           slower than you expect.
 
                                    For a more detailed discussion of the
                                    sensitivity of certain classes to prepayment
                                    rates and a description of the factors that
                                    may influence prepayments, see "Yield and
                                    Weighted Average Life Considerations" in
                                    this prospectus supplement and "Yield,
                                    Maturity and Weighted Average Life
                                    Considerations" in the prospectus.
 
IF YOU ARE THE HOLDER OF A
CLASS A3 OR CLASS A4 CERTIFICATE,
THE LEVEL OF LIBOR WILL GREATLY
INFLUENCE THE YIELD ON YOUR
CERTIFICATES                        The amount of interest payable on the Class
                                    A3 and Class A4 Certificates is calculated
                                    by reference to the London Interbank Offered
                                    Rate, known as LIBOR. If LIBOR falls, the
                                    yield on the Class A3 Certificates will be
                                    lower. By contrast, if LIBOR rises, the
                                    yield on the Class A4 Certificates will be
                                    lower. The interest rate payable on both the
                                    Class A3 and Class A4 Certificates will not
                                    exceed a specified rate, regardless of LIBOR
                                    levels. See "Yield and Weighted Average Life
                                    Considerations -- Sensitivity of the LIBOR
                                    Certificates" in this prospectus supplement
                                    for more information on the yield
                                    sensitivity of these certificates.
 
YOU MAY BE UNABLE TO REINVEST
DISTRIBUTIONS FROM THE CERTIFICATES
IN COMPARABLE INVESTMENTS           Rapid prepayment rates on the mortgage loans
                                    are likely to coincide with periods of low
                                    prevailing interest rates. During these
                                    periods, the yield at which you may be able
                                    to reinvest amounts received as payments on
                                    your certificates may be lower than the
                                    yield on your certificates. Conversely, slow
                                    prepayment rates on the mortgage loans are
                                    likely to coincide with periods of high
                                    interest rates. During these periods, the
                                    amount of payments available to you for
                                    reinvestment at high rates may be relatively
                                    low.
 
                                       S-9
<PAGE>   10
 
                                    See "Yield and Weighted Average Life
                                    Considerations" in this prospectus
                                    supplement and "Yield, Maturity and Weighted
                                    Average Life Considerations" in the
                                    prospectus for more discussion of the effect
                                    of prepayments.
 
PREPAYMENTS MAY CAUSE REDUCTIONS
IN INTEREST DISTRIBUTIONS ON
YOUR CERTIFICATES                   The actual interest rate on your certificate
                                    may be less than the interest rate stated in
                                    this prospectus supplement. Your
                                    certificates will be allocated any interest
                                    shortfalls that we do not compensate for as
                                    described in this prospectus supplement. The
                                    circumstances under which these interest
                                    shortfalls will occur are described in
                                    "Description of the
                                    Certificates -- Distributions on the
                                    Certificates" in this prospectus supplement.
 
THE CONCENTRATION OF MORTGAGE
LOANS IN SPECIFIC GEOGRAPHIC AREAS
MAY INCREASE THE RISK OF LOSS ON
THOSE MORTGAGE LOANS AND REDUCE
THE YIELD ON YOUR CERTIFICATES      A significant percentage of the mortgage
                                    loans in the trust are secured by properties
                                    located in California, Massachusetts and
                                    Florida. Any deterioration in the real
                                    estate market or economy of any of these
                                    states could result in higher rates of loss
                                    and delinquency than expected on the
                                    mortgage loans. In addition, these states or
                                    regions may experience natural disasters,
                                    such as earthquakes, fires, floods and
                                    hurricanes, which may not be fully insured
                                    against and which may result in property
                                    damage and losses on the mortgage loans.
                                    These events may in turn have a
                                    disproportionate impact on funds available
                                    to the trust, which will reduce the yield on
                                    your certificates.
 
                                    See "Description of the Mortgage Pool and
                                    the Mortgaged Properties" in this prospectus
                                    supplement for more information on the
                                    location of the mortgage loans.
 
LOSSES ON THE MORTGAGE LOANS MAY
BE HIGHER THAN EXPECTED, WHICH
MAY LOWER THE YIELD ON YOUR
CERTIFICATES                        A decline in real estate values or in
                                    economic conditions generally could increase
                                    the rates of delinquencies, foreclosures and
                                    losses on the mortgage loans to a level that
                                    is significantly higher than those
                                    experienced currently. This in turn will
                                    reduce the yield on your certificates, if
                                    the credit enhancement described in this
                                    prospectus supplement is not enough to
                                    protect your certificates from these losses.
 
THE SUBORDINATION PROVIDED BY THE
JUNIOR CERTIFICATES MAY NOT BE
ADEQUATE TO PROTECT THE SENIOR
CERTIFICATES FROM ALL LOSSES        As described in "Description of the
                                    Certificates -- Allocation of Realized
                                    Losses," losses will be allocated first to
                                    the junior certificates. Losses may be
                                    severe enough, however, to reduce the
                                    aggregate principal balance of the Class M
                                    and Class B Certificates to zero. If that
                                    occurs, the senior certificates will bear
                                    their share of losses thereafter.
 
                                      S-10
<PAGE>   11
 
IF WE EXERCISE OUR OPTION TO
TERMINATE THE TRUST, THE YIELD
ON YOUR CERTIFICATES COULD BE
LOWER THAN EXPECTED                 We may, at our option, terminate the trust
                                    under the circumstances described in "The
                                    Pooling and Servicing
                                    Agreement -- Termination" in this prospectus
                                    supplement. If the proceeds realized upon
                                    termination are less than the outstanding
                                    principal balance on the certificates and
                                    accrued interest thereon, your certificates
                                    may bear their share of the resulting
                                    shortfall. As a result, you may not fully
                                    recover your investment and could
                                    potentially suffer losses. In addition,
                                    termination of the trust will result in the
                                    early retirement of your certificates, which
                                    will shorten the average life of the
                                    certificates and potentially lower their
                                    yield.
 
                                    You should refer to "The Pooling and
                                    Servicing Agreement -- Termination" for a
                                    discussion of additional consequences of the
                                    trust's early termination.
 
YOU MAY NOT BE ABLE TO RESELL
YOUR CERTIFICATES                   The certificates will not be listed on any
                                    securities exchange, and a resale market for
                                    the certificates may not develop. Although
                                    the underwriters of this offering intend to
                                    create a resale market for the certificates
                                    they are offering, they have no obligation
                                    to do so. If a market for the certificates
                                    does develop, it may not continue. Moreover,
                                    this market may not be liquid enough to
                                    allow you to resell your certificates or to
                                    resell them at the price you desire.
 
YOU WILL NOT RECEIVE PHYSICAL
CERTIFICATES, WHICH CAN CAUSE
DELAYS IN DISTRIBUTIONS AND HAMPER
YOUR ABILITY TO PLEDGE OR RESELL
YOUR CERTIFICATES                   Unless you are the purchaser of the Class R
                                    Certificates, your ownership of the
                                    certificates will be registered
                                    electronically with DTC. The lack of
                                    physical certificates could:
 
                                         - result in payment delays on the
                                           certificates because the trustee will
                                           be sending distributions on the
                                           certificates to DTC instead of
                                           directly to you;
 
                                         - make it difficult for you to pledge
                                           your certificates if physical
                                           certificates are required by the
                                           party demanding the pledge; and
 
                                         - could hinder your ability to resell
                                           the certificates because some
                                           investors may be unwilling to buy
                                           certificates that are not in physical
                                           form.
 
OUR FAILURE OR THAT OF THIRD
PARTIES TO BE YEAR 2000 COMPUTER
READY COULD DISRUPT THE
DISTRIBUTIONS ON YOUR CERTIFICATES  Many computer systems and microprocessors
                                    with data functions, including those in
                                    non-information technology equipment and
                                    systems, use only two digits to identify a
                                    year in the date field with the assumption
                                    that the first two digits of the year are
 
                                      S-11
<PAGE>   12
 
                                    always "19." Consequently, on January 1,
                                    2000, computers that are not year 2000
                                    compliant may read the year as 1900 and
                                    malfunction.
 
                                    We have developed a plan, which is described
                                    in "Year 2000 Computer Readiness" in the
                                    prospectus, to become year 2000 compliant by
                                    mid-1999. We cannot guarantee, however, that
                                    our efforts to achieve year 2000 readiness
                                    will be fully effective. Moreover, we cannot
                                    guarantee that any of our third-party
                                    service providers, such as trustees,
                                    borrowers' banks, loan servicers and DTC,
                                    will be year 2000 ready. We also cannot
                                    assure you that any future developments in
                                    connection with our year 2000 readiness or
                                    the readiness of third parties will be those
                                    that we have anticipated.
 
                                    Our failure, or the failure of our
                                    third-party servicers, to become fully year
                                    2000 ready could disrupt, at least
                                    temporarily, our ability to carry out the
                                    servicing duties described in this
                                    prospectus supplement, including the
                                    calculation of amounts distributable to you
                                    and the timely transfer of funds to the
                                    trustee for your benefit. Your investment in
                                    the certificates could consequently suffer.
 
                                      S-12
<PAGE>   13
 
INDEX OF DEFINITIONS
 
     You can find a list of capitalized terms used in this prospectus
supplement, and the pages on which they are defined, under the caption "Index of
Certain Prospectus Supplement Definitions" beginning on page S-70 of this
prospectus supplement. Any capitalized terms that are not defined in the
prospectus supplement are defined in the accompanying prospectus. See "Index of
Certain Prospectus Definitions" on page 91 of the accompanying prospectus.
 
DESCRIPTION OF THE MORTGAGE POOL AND THE MORTGAGED PROPERTIES
 
GENERAL
 
     The certificates described in this prospectus supplement will represent the
entire beneficial ownership interest in the trust that is issuing these
certificates. The assets of the trust will consist primarily of a pool of
conventional, fixed-rate, fully-amortizing mortgage loans. The mortgage loans
are secured by mortgages, deeds of trust or other security instruments creating
first liens on one- to four-family residential properties or first liens on
rights to own and occupy apartments in cooperative buildings. GE Capital
Mortgage Services, Inc. ("GECMSI") is depositing the mortgage loans in the
trust.
 
     Certain data with respect to the mortgage loans expected to be included in
the trust are set forth below. A description of the final mortgage loan pool on
a Current Report on Form 8-K will be available to purchasers of the certificates
at or before, and will be filed by GECMSI with the SEC within fifteen days
after, the initial delivery of the certificates. This definitive description
will specify the precise aggregate Scheduled Principal Balance (as defined in
this prospectus supplement) of the mortgage loans as of the first day of the
month of the creation of the trust (the "Cut-off Date") and will also include
statistical data relating to the final mortgage loans comparable in scope to
that set forth with respect to the expected mortgage loan pool on pages S-16
through S-20 of this prospectus supplement. It also will specify the original
principal balance of each class of certificates and the notional principal
balance of the Class S Certificates on the date of issuance of the certificates,
the initial Senior Percentage, the initial Class A5 Percentage, the initial
Junior Percentage, the Bankruptcy Loss Amount, the Fraud Loss Amount and the
Special Hazard Loss Amount, each as defined herein, as of the Cut-off Date. The
Pooling and Servicing Agreement and its exhibits will be filed as an exhibit to
the definitive description of the final mortgage loan pool.
 
     The "Scheduled Principal Balance" of a mortgage loan as of the Cut-off Date
is the then outstanding principal balance thereof, after deducting payments of
principal due or received on or before such date. 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 or similar proceeding or any moratorium or similar waiver or grace
period) as of the first day of the month preceding the month of such
Distribution Date, after giving effect to any previously applied partial
principal prepayments, the payment of principal due on such first day of the
month and Deficient Valuations occurring after the Bankruptcy Coverage
Termination Date (as such terms are defined herein), irrespective of any
delinquency in payment by the related borrower.
 
     The "Pool Scheduled Principal Balance" as of any Distribution Date is equal
to the aggregate Scheduled Principal Balances of all of the mortgage loans that
were Outstanding Mortgage Loans on the first day of the month preceding the
month of such Distribution
 
                                      S-13
<PAGE>   14
 
Date (or such other date as is specified). An "Outstanding Mortgage Loan" is any
mortgage loan which has not been prepaid in full, has not become a Liquidated
Mortgage Loan and has not been repurchased.
 
     We expect that the mortgage loans (by Scheduled Principal Balance as of the
Cut-off Date) will have been originated under the following documentation
programs:
 
     - At least 95% of the mortgage loans and substantially all of the mortgage
       loans with loan-to-value ratios in excess of 80% will have been
       originated under GECMSI's full or alternative documentation program or
       other full or alternative documentation programs acceptable to GECMSI.
 
     - No more than 4.50% of the mortgage loans will have been originated under
       GECMSI's no income verification programs.
 
     - No more than 0.50% of the mortgage loans will have been originated under
       GECMSI's "Enhanced Streamlined Refinance Program" or other streamlined
       refinance programs acceptable to GECMSI.
 
     - No more than 0.50% of the mortgage loans will have been originated under
       GECMSI's "No Ratio Program" or other no ratio programs acceptable to
       GECMSI.
 
     - No more than 0.50% of the mortgage loans will have been originated under
       GECMSI's "No Income, No Asset Verification Program" or other no income,
       no asset verification programs acceptable to GECMSI.
 
     - No more than 0.40% of the mortgage loans will have been acquired under
       GECMSI's "Relocation Loan" program or other relocation programs
       acceptable to GECMSI.
 
     See "The Trusts -- The Mortgage Loans -- Loan Underwriting Policies" in the
accompanying prospectus for a description of these documentation programs.
 
     Each mortgage loan other than a Cooperative Loan, as defined below, is
required to be covered by a standard hazard insurance policy. Each mortgage loan
which had a loan-to-value ratio at origination in excess of 80% also will be
covered by a private mortgage insurance policy. See "Servicing of the Mortgage
Loans -- Hazard Insurance" and "-- Private Mortgage Insurance" in the
prospectus.
 
     All payments due on each mortgage loan on which at least one payment of
principal and interest was due prior to the Cut-off Date will have been paid
through the first day of the month preceding the Cut-off Date. The mortgage pool
will include a substantial number of recently originated loans on which the
first monthly payments are not due until the Cut-off Date or on a date
subsequent to the initial issuance of the certificates.
 
     For a description of the underwriting standards generally applicable to the
mortgage loans, see "The Trust Fund -- The Mortgage Loans -- Loan Underwriting
Policies" in the prospectus.
 
THE MORTGAGE LOANS
 
     The mortgage loans will have an aggregate Scheduled Principal Balance as of
the Cut-off Date, after deducting payments of principal due on or before such
date, of approximately $500,082,531. This amount is subject to a permitted
variance such that the aggregate Scheduled Principal Balance thereof will not be
less than $475,000,000 or greater than $525,000,000.
                                      S-14
<PAGE>   15
 
     Prior to issuance of the certificates, we will not remove from the expected
mortgage pool more than 5% of the mortgage loans, measured by Scheduled
Principal Balance as of the Cut-off Date, unless a revised prospectus supplement
is delivered to prospective investors. In addition, prior to issuance of the
certificates, we will not add mortgage loans to the mortgage pool if this would
result in more than a 5% increase in the size of the mortgage pool, measured by
Scheduled Principal Balance as of the Cut-off Date, unless a revised prospectus
supplement is delivered to prospective investors.
 
     The interest rates borne by the mortgage loans are expected to range from
5.875% to 9.000% per annum, and the weighted average mortgage interest rate as
of the Cut-off Date of such mortgage loans is expected to be between 7.15% and
7.19% per annum. The original principal balances of the mortgage loans are
expected to range from $238,000 to $1,000,000 and, as of the Cut-off Date, the
average Scheduled Principal Balance of the mortgage loans is not expected to
exceed $347,000 after application of payments due on or before the Cut-off Date.
It is expected that the month and year of the earliest origination date of any
mortgage loan will be November 1997, and the month and year of the latest
scheduled maturity date of any such mortgage loan will be February 2029. All of
the mortgage loans will have original terms to maturity of 20 to 30 years, and
it is expected that the weighted average scheduled remaining term to maturity of
the mortgage loans will be between 355 and 357 months as of the Cut-off Date.
 
     The mortgage loans are expected to have the following additional
characteristics (by Scheduled Principal Balance of all the mortgage loans) as of
the Cut-off Date:
 
     - No more than 12% of such mortgage loans will have a Scheduled Principal
       Balance of more than $500,000 and up to and including $750,000. No more
       than 3% of the mortgage loans will have a Scheduled Principal Balance of
       more than $750,000 and up to and including $1,000,000. None of the
       mortgage loans will have a Scheduled Principal Balance of more than
       $1,000,000.
 
     - No more than 12% of the mortgage loans will have a loan-to-value ratio at
       origination in excess of 80%, no more than 4% of the mortgage loans will
       have a loan-to-value ratio at origination in excess of 90%, and none of
       the mortgage loans will have a loan-to-value ratio at origination in
       excess of 95%. As of the Cut-off Date, the weighted average loan-to-value
       ratio at origination of the mortgage loans is expected to be between 72%
       and 74%.
 
     - No more than 0.50% of the mortgage loans had a loan-to-value ratio at
       origination calculated based on an appraisal conducted more than one year
       before the origination date thereof.
 
     - The proceeds of at least 35% of the mortgage loans will have been used to
       acquire the related mortgaged property. The proceeds of the remainder of
       the mortgage loans will have been used to refinance an existing loan. No
       more than 19% of such mortgage loans will have been the subject of
       "cash-out" refinancings.
 
     - None of the mortgage loans will be temporary buy-down mortgage loans.
 
     - No more than 2% of such mortgage loans will be secured by mortgaged
       properties located in any one postal zip code area.
 
     - No more than 50% of the mortgage loans will be secured by mortgaged
       properties located in California. The majority of the mortgage loans will
       be secured by mortgaged properties located in California, Massachusetts,
       Florida, Maryland, Washington, New Jersey and Colorado.
 
                                      S-15
<PAGE>   16
 
     - No more than 3% of the mortgage loans will be secured by mortgaged
       properties located in any one state except the states specified in the
       preceding sentence.
 
     - At least 96% of such mortgage loans will be secured by mortgaged
       properties determined by GECMSI to be the primary residence of the
       mortgagor. The basis for the determination will be the making of a
       representation by the mortgagor at origination that the underlying
       property will be used as the mortgagor's primary residence.
 
     - At least 91% of the mortgage loans will be secured by single-family,
       detached residences.
 
     - No more than 5% of the mortgage loans will be secured by condominiums.
 
     - No more than 1% of the mortgage loans will be secured by shares of stock
       in cooperative housing corporations and assignments of the proprietary
       leases to occupy cooperative apartment units therein (each, a
       "Cooperative Loan").
 
     Set forth below is a description of certain characteristics of the mortgage
pool and the mortgage loans expected to be included therein, subject to the
variance described herein (the sum of the percentages may not equal 100% due to
rounding):
 
               ORIGINAL PRINCIPAL BALANCES AS OF THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
                                                       AGGREGATE SCHEDULED    PERCENTAGE OF POOL BY
                                                        PRINCIPAL BALANCE      AGGREGATE SCHEDULED
RANGE OF ORIGINAL                    NUMBER OF              AS OF THE         PRINCIPAL BALANCE AS
PRINCIPAL BALANCE                  MORTGAGE LOANS         CUT-OFF DATE         OF THE CUT-OFF DATE
- -----------------                ------------------    -------------------    ---------------------
<S>                              <C>                   <C>                    <C>
$227,151- 250,000..............           62             $ 15,229,534.14                3.05%
 250,001- 300,000..............          576              158,981,621.89               31.79
 300,001- 350,000..............          343              111,376,593.91               22.27
 350,001- 400,000..............          180               67,550,831.69               13.51
 400,001- 450,000..............          105               44,931,737.98                8.98
 450,001- 600,000..............          139               70,479,250.75               14.09
 600,001- 650,000..............           29               18,415,634.87                3.68
 650,001-1,000,000.............           16               13,117,325.71                2.62
                                       -----             ---------------            --------
     Total.....................        1,450             $500,082,530.94              100.00%
                                       =====             ===============            ========
</TABLE>
 
                                      S-16
<PAGE>   17
 
                 MORTGAGE INTEREST RATES AS OF THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
                                                    AGGREGATE SCHEDULED    PERCENTAGE OF POOL BY
                                                     PRINCIPAL BALANCE      AGGREGATE SCHEDULED
                                    NUMBER OF            AS OF THE         PRINCIPAL BALANCE AS
MORTGAGE INTEREST RATE            MORTGAGE LOANS       CUT-OFF DATE         OF THE CUT-OFF DATE
- ----------------------            --------------    -------------------    ---------------------
<S>                               <C>               <C>                    <C>
5.8750%.........................          1           $    397,940.80               0.08%
6.1250..........................          1                247,017.65               0.05
6.2500..........................          1                258,009.29               0.05
6.3750..........................          8              2,317,470.14               0.46
6.5000..........................         32             11,369,873.81               2.27
6.6250..........................         33             11,564,529.41               2.31
6.7500..........................         87             31,564,959.63               6.31
6.8750..........................        175             59,519,895.83              11.90
6.9000..........................          3                899,954.15               0.18
7.0000..........................        238             83,631,779.50              16.72
7.0500..........................          4              1,779,659.23               0.36
7.1000..........................          7              2,557,786.82               0.51
7.1250..........................        190             62,876,040.12              12.57
7.1500..........................          2                602,060.24               0.12
7.2500..........................        205             68,359,428.67              13.67
7.3000..........................          3                840,861.02               0.17
7.3250..........................          1                363,438.79               0.07
7.3500..........................          2                618,085.98               0.12
7.3750..........................        174             60,370,430.00              12.07
7.4000..........................          1                299,083.00               0.06
7.4500..........................          1                288,025.65               0.06
7.5000..........................        134             46,496,462.58               9.30
7.5500..........................          1                283,353.99               0.06
7.6000..........................          1                317,460.83               0.06
7.6250..........................         72             24,619,477.06               4.92
7.7500..........................         43             15,944,276.33               3.19
7.8750..........................         13              4,313,868.13               0.86
8.0000..........................          7              2,623,588.20               0.52
8.1250..........................          4              1,714,071.18               0.34
8.2500..........................          3                974,014.57               0.19
8.3750..........................          1                586,467.51               0.12
8.6250..........................          1                746,114.77               0.15
9.0000..........................          1                737,046.06               0.15
                                      -----           ---------------             ------
     Total......................      1,450           $500,082,530.94             100.00%
                                      =====           ===============             ======
</TABLE>
 
                                      S-17
<PAGE>   18
 
     GEOGRAPHIC DISTRIBUTION OF MORTGAGED PROPERTIES AS OF THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
                                                    AGGREGATE SCHEDULED    PERCENTAGE OF POOL BY
                                                     PRINCIPAL BALANCE      AGGREGATE SCHEDULED
                                    NUMBER OF            AS OF THE         PRINCIPAL BALANCE AS
STATE                             MORTGAGE LOANS       CUT-OFF DATE         OF THE CUT-OFF DATE
- -----                             --------------    -------------------    ---------------------
<S>                               <C>               <C>                    <C>
Alabama.........................          7           $  2,376,359.47               0.48%
Arizona.........................         42             13,609,950.94               2.72
Arkansas........................          1                274,547.86               0.05
California......................        719            248,148,241.13              49.62
Colorado........................         50             16,182,372.17               3.24
Connecticut.....................         11              4,603,100.12               0.92
Delaware........................          2                546,473.05               0.11
District of Columbia............          3                842,320.45               0.17
Florida.........................         53             20,260,816.85               4.05
Georgia.........................         26              8,349,884.99               1.67
Hawaii..........................          6              3,287,297.38               0.66
Idaho...........................          2                524,949.28               0.10
Illinois........................         44             14,612,649.37               2.92
Indiana.........................          8              2,595,847.67               0.52
Kentucky........................          2                652,055.49               0.13
Louisiana.......................          1                256,617.35               0.05
Maine...........................          1                246,719.33               0.05
Maryland........................         54             18,195,515.23               3.64
Massachusetts...................         84             28,837,297.30               5.77
Michigan........................         27              8,669,448.83               1.73
Minnesota.......................         10              3,828,616.58               0.77
Missouri........................          4              1,692,730.76               0.34
Montana.........................          1                343,788.66               0.07
Nevada..........................          5              1,491,856.17               0.30
New Hampshire...................          3                859,807.10               0.17
New Jersey......................         45             16,822,452.23               3.36
New Mexico......................          4              1,878,156.15               0.38
New York........................         28             10,582,654.63               2.12
North Carolina..................         24              7,953,329.84               1.59
Ohio............................          8              2,186,774.35               0.44
Oklahoma........................          2                627,890.20               0.13
Oregon..........................          7              2,239,207.15               0.45
Pennsylvania....................         15              5,444,601.74               1.09
Rhode Island....................          3              1,255,226.40               0.25
South Carolina..................          6              1,849,770.37               0.37
Tennessee.......................          4              1,356,659.53               0.27
Texas...........................         32             10,679,755.55               2.14
Utah............................          8              2,360,529.39               0.47
Vermont.........................          2                625,950.42               0.13
Virginia........................         39             13,344,251.94               2.67
Washington......................         52             18,140,778.62               3.63
Wisconsin.......................          5              1,445,278.90               0.29
                                      -----           ---------------             ------
     Total......................      1,450           $500,082,530.94             100.00%
                                      =====           ===============             ======
</TABLE>
 
                                      S-18
<PAGE>   19
 
                   YEAR OF ORIGINATION AS OF THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
                                                    AGGREGATE SCHEDULED    PERCENTAGE OF POOL BY
                                                     PRINCIPAL BALANCE      AGGREGATE SCHEDULED
                                    NUMBER OF            AS OF THE         PRINCIPAL BALANCE AS
      YEAR OF ORIGINATION         MORTGAGE LOANS       CUT-OFF DATE         OF THE CUT-OFF DATE
      -------------------         --------------    -------------------    ---------------------
<S>                               <C>               <C>                    <C>
1997............................          1           $    260,310.76               0.05%
1998............................      1,089            373,937,987.40              74.78
1999............................        360            125,884,232.78              25.17
                                      -----           ---------------             ------
     Total......................      1,450           $500,082,530.94             100.00%
                                      =====           ===============             ======
</TABLE>
 
                    YEAR OF MATURITY AS OF THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
                                                    AGGREGATE SCHEDULED    PERCENTAGE OF POOL BY
                                                     PRINCIPAL BALANCE      AGGREGATE SCHEDULED
                                    NUMBER OF            AS OF THE         PRINCIPAL BALANCE AS
        YEAR OF MATURITY          MORTGAGE LOANS       CUT-OFF DATE         OF THE CUT-OFF DATE
        ----------------          --------------    -------------------    ---------------------
<S>                               <C>               <C>                    <C>
2018............................          9           $  2,695,885.03               0.54%
2019............................          3                966,053.45               0.19
2022............................          1                286,202.91               0.06
2023............................          3              1,119,381.69               0.22
2024............................          5              1,510,421.09               0.30
2026............................          2                598,889.66               0.12
2027............................          7              2,255,106.62               0.45
2028............................        670            230,467,261.73              46.09
2029............................        750            260,183,328.76              52.03
                                      -----           ---------------             ------
     Total......................      1,450           $500,082,530.94             100.00%
                                      =====           ===============             ======
</TABLE>
 
              TYPES OF MORTGAGED PROPERTIES AS OF THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
                                                    AGGREGATE SCHEDULED    PERCENTAGE OF POOL BY
                                                     PRINCIPAL BALANCE      AGGREGATE SCHEDULED
                                    NUMBER OF            AS OF THE         PRINCIPAL BALANCE AS
TYPE OF DWELLING                  MORTGAGE LOANS       CUT-OFF DATE         OF THE CUT-OFF DATE
- ----------------                  --------------    -------------------    ---------------------
<S>                               <C>               <C>                    <C>
Single-family detached..........      1,346           $465,021,174.77              92.99%
Single-family attached..........         39             13,261,598.32               2.65
Condominium.....................         49             15,825,992.52               3.16
2-4 family units................         15              5,710,360.96               1.14
Co-op...........................          1                263,404.37               0.05
                                      -----           ---------------             ------
     Total......................      1,450           $500,082,530.94             100.00%
                                      =====           ===============             ======
</TABLE>
 
        OCCUPANCY STATUS OF MORTGAGED PROPERTIES AS OF THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
                                                    AGGREGATE SCHEDULED    PERCENTAGE OF POOL BY
                                                     PRINCIPAL BALANCE      AGGREGATE SCHEDULED
                                    NUMBER OF            AS OF THE         PRINCIPAL BALANCE AS
OCCUPANCY                         MORTGAGE LOANS       CUT-OFF DATE         OF THE CUT-OFF DATE
- ---------                         --------------    -------------------    ---------------------
<S>                               <C>               <C>                    <C>
Owner Occupied..................      1,424           $491,672,835.98              98.32%
Vacation........................         23              7,472,865.02               1.49
Investment......................          3                936,829.94               0.19
                                      -----           ---------------             ------
     Total......................      1,450           $500,082,530.94             100.00%
                                      =====           ===============             ======
</TABLE>
 
                                      S-19
<PAGE>   20
 
              PURPOSE OF THE MORTGAGE LOANS AS OF THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
                                                    AGGREGATE SCHEDULED    PERCENTAGE OF POOL BY
                                                     PRINCIPAL BALANCE      AGGREGATE SCHEDULED
                                    NUMBER OF            AS OF THE         PRINCIPAL BALANCE AS
PURPOSE OF THE LOAN               MORTGAGE LOANS       CUT-OFF DATE         OF THE CUT-OFF DATE
- -------------------               --------------    -------------------    ---------------------
<S>                               <C>               <C>                    <C>
Purchase........................        557           $186,378,049.47              37.27%
Rate Term/Refinance.............        664            231,133,440.07              46.22
Cash-out Refinance..............        229             82,571,041.40              16.51
                                      -----           ---------------             ------
     Total......................      1,450           $500,082,530.94             100.00%
                                      =====           ===============             ======
</TABLE>
 
                  LOAN-TO-VALUE RATIOS AS OF THE CUT-OFF DATE
 
<TABLE>
<CAPTION>
                                                    AGGREGATE SCHEDULED    PERCENTAGE OF POOL BY
                                                     PRINCIPAL BALANCE      AGGREGATE SCHEDULED
LOAN-TO-VALUE RATIO                 NUMBER OF            AS OF THE         PRINCIPAL BALANCE AS
AT ORIGINATION                    MORTGAGE LOANS       CUT-OFF DATE         OF THE CUT-OFF DATE
- -------------------               --------------    -------------------    ---------------------
<S>                               <C>               <C>                    <C>
 00.001-50.00%..................         69           $ 26,970,485.26               5.39%
 50.001-60.00...................         93             34,991,833.73               7.00
 60.001-70.00...................        238             89,269,401.12              17.85
 70.001-75.00...................        245             85,928,644.60              17.18
 75.001-80.00...................        617            207,341,355.39              41.46
 80.001-85.00...................         23              7,285,737.68               1.46
 85.001-90.00...................        115             35,002,271.84               7.00
 90.001-95.00...................         50             13,292,801.32               2.66
                                      -----           ---------------             ------
     Total......................      1,450           $500,082,530.94             100.00%
                                      =====           ===============             ======
</TABLE>
 
DESCRIPTION OF THE CERTIFICATES
 
GENERAL
 
     The certificates will be issued pursuant to a Pooling and Servicing
Agreement (the "Agreement") to be dated as of the Cut-off Date between GECMSI,
as depositor of the mortgage loans and servicer, and State Street Bank and Trust
Company, as trustee (the "Trustee"). See the prospectus for important additional
information regarding the terms and conditions of the Agreement and the
certificates. The certificates will be issued in the classes offered by this
prospectus supplement, together with the Class PO, Class S, Class B3, Class B4
and Class B5 Certificates, none of which are offered hereby. The certificates
will be issued in the aggregate original principal balance of approximately
$500,082,531, subject to a permitted variance such that the aggregate original
principal balance will not be less than $475,000,000 or greater than
$525,000,000. Any such variance will be allocated so as to approximate the
material characteristics of the classes of certificates described herein.
 
     As described below, each class of certificates offered hereby, other than
the Class R Certificates, which are referred to as the "residual certificates",
will be issued in book-entry form. Beneficial interests in the certificates will
be held by investors through the book-entry facilities of The Depository Trust
Company, as described below, in the minimum denominations described in the
summary of this prospectus supplement. Notwithstanding the integral multiple
requirements described in the summary, one certificate of each class other than
the residual certificates may evidence an additional amount equal to the
remaining principal balance thereof.
 
                                      S-20
<PAGE>   21
 
BOOK-ENTRY CERTIFICATES
 
     Each class of the certificates offered hereby other than the residual
certificates (the "Book-Entry Certificates") will be registered as a single
certificate held by a nominee of The Depository Trust Company, which is known as
DTC. For purposes of this discussion, the term DTC also refers to any successor
depository selected by DTC. GECMSI has been informed by DTC that its nominee
will be Cede & Co. Accordingly, Cede & Co. is expected to be the holder of
record of the Book-Entry Certificates. Except as described below, no person
acquiring a Book-Entry Certificate (each, a "beneficial owner") will be entitled
to receive a definitive physical certificate representing such certificate.
 
     The beneficial owner's ownership of a Book-Entry Certificate will be
recorded on the records of the brokerage firm, bank, thrift institution or other
financial intermediary (each, a "Financial Intermediary") that maintains the
beneficial owner's account for such purpose. In turn, the Financial
Intermediary's ownership of such Book-Entry Certificate will be recorded on the
records of DTC (or of a participating firm that acts as agent for the Financial
Intermediary, whose interest will in turn be recorded on the records of DTC, if
the beneficial owner's Financial Intermediary is not a DTC participant).
Therefore, the beneficial owner must rely on the foregoing procedures to
evidence its beneficial ownership of a Book-Entry Certificate. Beneficial
ownership of a Book-Entry Certificate may only be transferred by compliance with
the procedures of such Financial Intermediaries and DTC participants.
 
     DTC, which is a New York-chartered limited purpose trust company, performs
services for its participants, some of which (and/or their representatives) own
DTC. In accordance with its normal procedures, DTC is expected to record the
positions held by each of its participants in the Book-Entry Certificates,
whether held for its own account or as a nominee for another person. In general,
beneficial ownership of Book-Entry Certificates will be subject to the rules,
regulations and procedures governing DTC and its participants as in effect from
time to time.
 
     Distributions of principal of and interest on the Book-Entry Certificates
will be made on each Distribution Date by the Trustee to DTC. DTC will be
responsible for crediting the amount of such payments to the accounts of the
applicable participants in accordance with DTC's normal procedures. Each DTC
participant will be responsible for disbursing such payments to the beneficial
owners of the Book-Entry Certificates that it represents and to each Financial
Intermediary for which it acts as agent. Each such Financial Intermediary will
be responsible for disbursing funds to the beneficial owners of the Book-Entry
Certificates that it represents.
 
     As a result, under a book-entry format, beneficial owners of the Book-Entry
Certificates may experience some delay in their receipt of payments. Because DTC
can only act on behalf of Financial Intermediaries, the ability of a beneficial
owner to pledge Book-Entry Certificates to persons or entities that do not
participate in the DTC system, or otherwise take actions in respect of such
Book-Entry Certificates, may be limited due to the lack of physical certificates
for such Book-Entry Certificates. In addition, issuance of the Book-Entry
Certificates in book-entry form may reduce the liquidity of such certificates in
the secondary market since certain potential investors may be unwilling to
purchase certificates for which they cannot obtain physical certificates.
 
     DTC has advised GECMSI and the Trustee that, unless and until definitive
physical certificates are issued, DTC will take any action permitted to be taken
by a holder of a certificate under the Agreement only at the direction of one or
more Financial
 
                                      S-21
<PAGE>   22
 
Intermediaries to whose DTC accounts the Book-Entry Certificates are credited.
DTC may take conflicting actions with respect to other Book-Entry Certificates
to the extent that such actions are taken on behalf of Financial Intermediaries
whose holdings include such Book-Entry Certificates.
 
     Definitive physical certificates will be issued to beneficial owners of the
related Book-Entry Certificates, or their nominees, rather than to DTC, only if
(a) DTC or GECMSI advises the Trustee in writing that DTC is no longer willing,
qualified or able to discharge properly its responsibilities as nominee and
depository with respect to the certificates and GECMSI or the Trustee is unable
to locate a qualified successor, (b) GECMSI, at its sole option, elects to
terminate the book-entry system through DTC or (c) after the occurrence of an
Event of Default as described in the accompanying prospectus, beneficial owners
of the Book-Entry Certificates aggregating not less than 51% of the aggregate
voting rights allocated thereto advise the Trustee and DTC through the Financial
Intermediaries in writing that the continuation of a book-entry system through
DTC (or a successor thereto) is no longer in the best interests of beneficial
owners of the certificates.
 
     Upon the occurrence of any of the events described in the immediately
preceding paragraph, the Trustee will be required to notify all beneficial
owners of the occurrence of such event and the availability through DTC of
definitive physical certificates. Upon surrender by DTC of the global
certificate or certificates representing the certificates and instructions for
registration, the Trustee will issue definitive physical certificates, and
thereafter the Trustee will recognize the holders of such certificates as
certificateholders under the Agreement. Following the issuance of definitive
physical certificates, distribution of principal and interest on the
certificates will be made by the Trustee directly to holders of these
certificates in accordance with the procedures set forth in the Agreement.
 
     The Agreement will provide that, if definitive physical certificates are
issued in respect of the Class M, Class B1 or Class B2 Certificates, no transfer
of such a certificate may be made unless the Trustee has received (1) a
certificate to the effect that the proposed transferee is not an ERISA Plan (as
defined herein) or that the transferee is an insurance company investing assets
of its general account and the exemption provided by Section III(a) of the
Department of Labor Prohibited Transaction Class Exemption 95-60, 60 Fed. Reg.
35925 (July 12, 1995), applies to such transferee's acquisition and holding of
such certificate or (2) an opinion of counsel relating to such transfer in form
and substance satisfactory to the Trustee and GECMSI. See "ERISA Considerations"
herein.
 
NON-BOOK-ENTRY CERTIFICATES
 
     The residual certificates (the "Non-Book-Entry Certificates") will be
issued in fully-registered, certificated form. The Non-Book-Entry Certificates
will be transferable and exchangeable on a certificate register to be maintained
at the corporate trust office in the city in which the Trustee is located or
such other office or agency maintained for such purposes by the Trustee in New
York City. Under the Agreement, the Trustee will initially be appointed as the
certificate registrar. No service charge will be made for any registration of
transfer or exchange of the residual certificates, but payment of a sum
sufficient to cover any tax or other governmental charge may be required by the
Trustee. The residual certificates will be subject to certain restrictions on
transfer. See "-- Restrictions on Transfer of the Residual Certificates" herein.
 
     Distributions of principal and interest, if any, on each Distribution Date
on the Non-Book-Entry Certificates will be made to the persons in whose names
such certificates are registered at the close of business on the last business
day of the month immediately
                                      S-22
<PAGE>   23
 
preceding the month of such Distribution Date (the "Record Date"). Distributions
will be made by check or money order mailed to the person entitled thereto at
the address appearing in the certificate register or, upon written request by
the certificateholder to the Trustee, by wire transfer to a United States
depository institution designated by such certificateholder and acceptable to
the Trustee or by such other means of payment as such certificateholder and the
Trustee may agree; provided, however, that the final distribution in retirement
of the Non-Book-Entry Certificates will be made only upon presentation and
surrender of such certificates at the office or agency of the Trustee specified
in the notice to the holders thereof of such final distribution.
 
AVAILABLE FUNDS
 
     The amount of funds ("Available Funds") in respect of the mortgage pool
that will be available for distribution to holders of the certificates on each
Distribution Date is described in the accompanying prospectus under "Servicing
of the Mortgage Loans -- Loan Payment Record."
 
DISTRIBUTIONS ON THE CERTIFICATES
 
Allocation of Available Funds
 
     Interest and principal on the certificates will be distributed monthly on
the 25th day of each month or, if such 25th day is not a business day, on the
succeeding business day (each, a "Distribution Date"), commencing in April 1999.
These distributions will be in an aggregate amount equal to the Available Funds
for such Distribution Date. Distributions will be made to holders of record on
the Record Date.
 
     On each Distribution Date, the Available Funds will be distributed in the
following order of priority among the certificates:
 
          first, to the classes of senior certificates (other than the Class PO
     Certificates), the Accrued Certificate Interest on each such class for such
     Distribution Date, any shortfall in available amounts being allocated among
     such classes in proportion to the amount of Accrued Certificate Interest
     otherwise distributable thereon;
 
          second, to the classes of senior certificates (other than the Class PO
     Certificates), any Accrued Certificate Interest thereon remaining
     undistributed from previous Distribution Dates, to the extent of remaining
     Available Funds, any shortfall in available amounts being allocated among
     such classes in proportion to the amount of such Accrued Certificate
     Interest remaining undistributed for each such class for such Distribution
     Date;
 
          third, to the classes of senior certificates entitled to principal
     distributions, in reduction of the aggregate class certificate principal
     balances (the "Class Certificate Principal Balances") thereof, to the
     extent of remaining Available Funds, concurrently as follows:
 
             (1) to the senior certificates designated in consecutive numerical
        order from Class A1 through Class A18 and the Class R Certificates, the
        Senior Optimal Principal Amount for such Distribution Date, in the
        following order of priority:
 
                  (a) to the Class A5 Certificates, the Class A5 Principal
             Distribution Amount (as defined herein) for such Distribution Date,
             until the Class Certificate Principal Balance thereof has been
             reduced to zero; and
 
                                      S-23
<PAGE>   24
 
                  (b) to the Class A1, Class A2, Class A3, Class A4, Class A6,
             Class A7, Class A8, Class A9, Class A10, Class A11, Class A12,
             Class A13, Class A14, Class A15, Class A16, Class A17, Class A18
             and Class R Certificates (together the "Group I Senior
             Certificates"), the Senior Optimal Principal Amount for such
             Distribution Date, less the Class A5 Principal Distribution Amount
             for such Distribution Date, in the following order of priority:
 
                       (I) to the Class R Certificates, until the Class
                  Certificate Principal Balance thereof has been reduced to
                  zero;
 
                       (II) to the Class A1, Class A15, Class A16, Class A17 and
                  Class A18 Certificates, concurrently, as follows:
 
                           (A) approximately 38.89209765% of the amount
                      distributable under this clause (1)(b)(II) to the Class A1
                      Certificates, until the Class Certificate Principal
                      Balance thereof has been reduced to zero;
 
                           (B) approximately 30.17736538% of the amount
                      distributable under this clause (1)(b)(II) to the Class
                      A15 Certificates;
 
                           (C) approximately 20.15713568% of the amount
                      distributable under this clause (1)(b)(II) to the Class
                      A16 Certificates; and
 
                           (D) approximately 10.77340129% of the amount
                      distributable under this clause (1)(b)(II) to the Class
                      A17 and Class A18 Certificates, in the following order of
                      priority:
 
                               (i) to the Class A17 Certificates, until the
                          Class Certificate Principal Balance thereof has been
                          reduced to zero; and
 
                               (ii) to the Class A18 Certificates, until the
                          Class Certificate Principal Balance thereof has been
                          reduced to zero;
 
                       (III) to the Class A2, Class A6, Class A7, Class A8,
                  Class A9, Class A15 and Class A16 Certificates, concurrently,
                  as follows:
 
                           (A) approximately 12.00281591% of the amount
                      distributable under this clause (1)(b)(III) to the Class
                      A2 Certificates, until the Class Certificate Principal
                      Balance thereof has been reduced to zero;
 
                           (B) approximately 21.99929602% of the amount
                      distributable under this clause (1)(b)(III) to the Class
                      A6, Class A7, Class A8 and Class A9 Certificates, in the
                      following order of priority:
 
                               (i) to the Class A6 Certificates, until the Class
                          Certificate Principal Balance thereof has been reduced
                          to zero;
 
                               (ii) to the Class A7 Certificates, until the
                          Class Certificate Principal Balance thereof has been
                          reduced to zero;
 
                               (iii) to the Class A8 Certificates, until the
                          Class Certificate Principal Balance thereof has been
                          reduced to zero; and
 
                               (iv) to the Class A9 Certificates, until the
                          Class Certificate Principal Balance thereof has been
                          reduced to zero;
 
                                      S-24
<PAGE>   25
 
                       (C) approximately 50.65557902% of the amount
                  distributable under this clause (1)(b)(III) to the Class A15
                  Certificates, until the Class Certificate Principal Balance
                  thereof has been reduced to zero; and
 
                       (D) approximately 15.34230905% of the amount
                  distributable under this clause (1)(b)(III) to the Class A16
                  Certificates, until the Class Certificate Principal Balance
                  thereof has been reduced to zero; and
 
                  (IV) to the Class A3, Class A4, Class A10, Class A11, Class
             A12, Class A13 and Class A14 Certificates, concurrently, as
             follows:
 
                       (A) approximately 53.47222138% of the amount
                  distributable under this clause (1)(b)(IV) to the Class A3
                  Certificates, until the Class Certificate Principal Balance
                  thereof has been reduced to zero;
 
                       (B) approximately 21.52777862% of the amount
                  distributable under this clause (1)(b)(IV) to the Class A4
                  Certificates, until the Class Certificate Principal Balance
                  thereof has been reduced to zero; and
 
                       (C) approximately 25.00000000% of the amount
                  distributable under this clause (1)(b)(IV) to the Class A10,
                  Class A11, Class A12, Class A13 and Class A14 Certificates as
                  a group, in the following order of priority:
 
                           (i) to the Class A10 Certificates, until the Class
                      Certificate Principal Balance thereof has been reduced to
                      zero;
 
                           (ii) to the Class A11 Certificates, until the Class
                      Certificate Principal Balance thereof has been reduced to
                      zero;
 
                           (iii) to the Class A12 Certificates, until the Class
                      Certificate Principal Balance thereof has been reduced to
                      zero;
 
                           (iv) to the Class A13 Certificates, until the Class
                      Certificate Principal Balance thereof has been reduced to
                      zero; and
 
                           (v) to the Class A14 Certificates, until the Class
                      Certificate Principal Balance thereof has been reduced to
                      zero; and
 
          (2) to the Class PO Certificates, the Class PO Principal Distribution
     Amount for such Distribution Date, until the Class Certificate Principal
     Balance thereof has been reduced to zero;
 
          fourth, to the Class PO Certificates, to the extent of remaining
     Available Funds, the Class PO Deferred Amount for such Distribution Date,
     until the Class Certificate Principal Balance thereof has been reduced to
     zero; provided that, (i) on any Distribution Date, distributions pursuant
     to this priority fourth shall not exceed the Junior Optimal Principal
     Amount for such Distribution Date, (ii) such distributions shall not reduce
     the Class Certificate Principal Balance of the Class PO Certificates and
     (iii) no distribution will be made in respect of the Class PO Deferred
     Amount after the Distribution Date on which the respective Class
     Certificate Principal Balances of the junior certificates have been reduced
     to zero (the "Cross-Over Date");
 
                                      S-25
<PAGE>   26
 
          fifth, to the Class M Certificates, to the extent of remaining
     Available Funds, in the following order: (a) the Accrued Certificate
     Interest thereon for such Distribution Date, (b) any Accrued Certificate
     Interest thereon remaining undistributed from previous Distribution Dates
     and (c) such Class's Allocable Share (as defined under "-- Principal"
     below) for such Distribution Date;
 
          sixth, to the Class B1 Certificates, to the extent of remaining
     Available Funds, in the following order: (a) the Accrued Certificate
     Interest thereon for such Distribution Date, (b) any Accrued Certificate
     Interest thereon remaining undistributed from previous Distribution Dates
     and (c) such Class's Allocable Share for such Distribution Date;
 
          seventh, to the Class B2 Certificates, to the extent of remaining
     Available Funds, in the following order: (a) the Accrued Certificate
     Interest thereon for such Distribution Date, (b) any Accrued Certificate
     Interest thereon remaining undistributed from previous Distribution Dates
     and (c) such Class's Allocable Share for such Distribution Date; and
 
          eighth, to each of the Class B3, Class B4 and Class B5 Certificates,
     to the extent of remaining Available Funds: (a) the Accrued Certificate
     Interest thereon for such Distribution Date, (b) any Accrued Certificate
     Interest thereon remaining undistributed from previous Distribution Dates
     and (c) such Classes' Allocable Share for such Distribution Date.
 
     The percentages set forth in priority third above were calculated on the
basis of the Class Certificate Principal Balances of the related certificates
described herein. If these Class Certificate Principal Balances are increased or
decreased in accordance with the variance permitted hereby, the applicable
percentages will be increased or decreased substantially correspondingly.
 
     On each Distribution Date after the Cross-Over Date, distributions of
principal on the outstanding senior certificates entitled to principal
distributions (other than the Class PO Certificates) will be made pro rata among
all such certificates, regardless of the allocation, or sequential nature, of
principal payments described in priority third above.
 
     "Pro rata" distributions among classes of certificates will be made in
proportion to the then-current Class Certificate Principal Balances of such
classes.
 
     If, after distributions have been made under priorities first and second
above on any Distribution Date, the remaining Available Funds are less than the
sum of the Senior Optimal Principal Amount and the Class PO Principal
Distribution Amount for such Distribution Date, the amounts distributable under
priority third above shall be proportionately reduced, and such remaining
Available Funds will be distributed on the senior certificates entitled to
principal distributions in accordance with the applicable clauses of priority
third above on the basis of such reduced amounts. Notwithstanding such
allocation, Realized Losses will be allocated to the certificates as described
under "-- Allocation of Realized Losses on the Certificates" herein.
 
Interest
 
     Interest will accrue on the certificates offered hereby entitled to
interest distributions, other than the Class A3 and Class A4 Certificates
(together, the "LIBOR Certificates"), at the respective interest rates set forth
in the summary of this prospectus supplement during each Interest Accrual
Period. The "Interest Accrual Period" for each class of certificates entitled to
distributions of interest, other than the LIBOR Certificates, will be the
one-month period ending on the last day of the month preceding the month in
which a Distribution Date occurs. The "Interest Accrual Period" for the LIBOR
Certificates will
                                      S-26
<PAGE>   27
 
be the one-month period commencing on the 25th day of the month preceding the
month in which a Distribution Date occurs and ending on the 24th day of the
month of such Distribution Date. Interest will be calculated on the basis of a
360-day year consisting of twelve 30-day months.
 
     The interest rate on the Class A3 and Class A4 Certificates will be
determined by reference to LIBOR.
 
     Interest will accrue on the Class A3 Certificates at an annual rate of
5.700% for the first Interest Accrual Period, and thereafter, with respect to
each Interest Accrual Period, at an annual rate equal to the lesser of (1)
0.750% plus LIBOR, and (2) 9.000%, subject to a minimum rate of 0.750%.
 
     Interest will accrue on the Class A4 Certificates at the annual rate of
8.196774098% for the first Interest Accrual Period, and thereafter, with respect
to each Interest Accrual Period, at an annual rate equal to the lesser of (1)
20.4919353% - (2.48387095 x LIBOR) and (2) 20.4919353%, subject to a minimum
rate of 0.000%.
 
     The Trustee will determine LIBOR in accordance with the methods described
under "-- Determination of LIBOR" below.
 
     Interest will accrue on the Class B3, Class B4 and Class B5 Certificates at
the interest rate of 6.50% per annum during each Interest Accrual Period.
 
     Interest will accrue on the Class S Certificates during each Interest
Accrual Period at a variable per annum rate equal to the excess of (1) the
weighted average (by Scheduled Principal Balance) carried to six decimal places,
rounded down, of the Net Mortgage Rates of the Outstanding Mortgage Loans which
are Non-discount Mortgage Loans as of the first day of such Interest Accrual
Period (or as of the Cut-off Date, in the case of the first Interest Accrual
Period) over (2) 6.50%. However, this calculation will not include any mortgage
loan that was the subject of a voluntary prepayment in full received by GECMSI,
or in the case of a mortgage loan master-serviced by GECMSI, of which GECMSI
receives notice, on or after the first day but on or before the fifteenth day of
the related Interest Accrual Period. The per annum interest rate on the Class S
Certificates for the first Interest Accrual Period is expected to be
approximately 0.4297%.
 
     The Class PO Certificates are principal-only certificates and will not
accrue interest.
 
     The "Accrued Certificate Interest" for any certificate entitled to
distributions of interest for any Distribution Date will equal the interest
accrued during the related Interest Accrual Period at the applicable Certificate
Interest Rate on the Certificate Principal Balance (or, in the case of a Class S
Certificate, the Notional Principal Balance) of such certificate immediately
prior to such Distribution Date, less such certificate's share of any Net
Interest Shortfall (as defined below), the interest portion of any Excess Losses
(as defined herein) through the Cross-Over Date and, after the Cross-Over Date,
the interest portion of Realized Losses, including Excess Losses.
 
     The "Certificate Principal Balance" of any certificate as of any
Distribution Date will equal such certificate's Certificate Principal Balance on
the Closing Date as reduced by;
 
     - all amounts distributed on previous Distribution Dates on such
       certificate on account of principal;
 
     - the principal portion of all Realized Losses previously allocated to such
       certificate; and
 
                                      S-27
<PAGE>   28
 
    - in the case of a junior certificate, such certificate's pro rata share, if
      any, of the Junior Certificate Writedown Amount (as defined below) and the
      Class PO Deferred Payment Writedown Amount (as defined below) for previous
      Distribution Dates.
 
     As of any Distribution Date, the "Junior Certificate Writedown Amount" will
equal the amount by which (a) the sum of the Class Certificate Principal
Balances of all of the certificates, after giving effect to the distribution of
principal and the application of Realized Losses in reduction of the Certificate
Principal Balances of the certificates on such Distribution Date, exceeds (b)
the Pool Scheduled Principal Balance on the first day of the month of such
Distribution Date less any Deficient Valuations occurring on or prior to the
Bankruptcy Coverage Termination Date.
 
     For any Distribution Date, the "Class PO Deferred Payment Writedown Amount"
will equal the amount, if any, distributed on such date in respect of the Class
PO Deferred Amount pursuant to priority fourth under "-- Allocation of Available
Funds" above. The Junior Certificate Writedown Amount and the Class PO Deferred
Payment Writedown Amount will be allocated to the classes of junior certificates
in inverse order of priority until the Class Certificate Principal Balance of
each such class has been reduced to zero.
 
     The aggregate "Notional Principal Balance" of the Class S Certificates as
of any Distribution Date will equal the aggregate Scheduled Principal Balance of
the Outstanding Mortgage Loans which are Non-discount Mortgage Loans as of the
first day of the calendar month preceding such Distribution Date. The initial
aggregate Notional Principal Balance of the Class S Certificates is expected to
be approximately $473,927,690.
 
     With respect to any Distribution Date, the "Net Interest Shortfall" will
equal the aggregate Interest Shortfalls with respect to such Distribution Date
less the Compensating Interest Payment, if any, for such Distribution Date. See
"The Pooling and Servicing Agreement -- Servicing Compensation, Compensating
Interest and Payment of Expenses" herein for a definition of "Compensating
Interest Payment."
 
     With respect to any Distribution Date, an "Interest Shortfall" in respect
of a mortgage loan will result from:
 
          (1) any voluntary prepayment of principal in full on such mortgage
     loan received from the sixteenth day (or, in the case of the first
     Distribution Date, from the Cut-off Date) through the last day of the month
     preceding such Distribution Date;
 
          (2) any partial prepayment of principal on such mortgage loan by the
     mortgagor during the month preceding such Distribution Date; or
 
          (3) a reduction in the interest rate on such mortgage loan due to the
     application of the Soldiers' and Sailors' Civil Relief Act of 1940 whereby,
     in general, members of the Armed Forces who entered into mortgages prior to
     the commencement of military service may have the interest rates on those
     mortgage loans reduced for the duration of their active military service.
 
See "Certain Legal Aspects of the Mortgage Loans -- The Mortgage
Loans -- Soldiers' and Sailors' Civil Relief Act" in the prospectus. As to any
Distribution Date and any mortgage loan with respect to which a prepayment in
full has occurred as described above, the resulting "Interest Shortfall"
generally will equal the difference between (a) one month's interest at the
mortgage interest rate net of the applicable servicing fee (the "Net Mortgage
Rate") on the Scheduled Principal Balance of such mortgage loan, and (b) the
amount of interest at the Net Mortgage Rate actually received with respect to
such
 
                                      S-28
<PAGE>   29
 
mortgage loan. In the case of a partial prepayment, the resulting "Interest
Shortfall" will equal one month's interest at the applicable Net Mortgage Rate
on the amount of such prepayment.
 
     Any Net Interest Shortfall, the interest portion of any Excess Losses
through the Cross-Over Date and, after the Cross-Over Date, the interest portion
of any Realized Losses (see "-- Allocation of Realized Losses on the
Certificates") will, on each Distribution Date, be allocated among all the
outstanding certificates entitled to distributions of interest in proportion to
the amount of Accrued Certificate Interest that would have been allocated
thereto in the absence of such shortfall and losses. See "The Pooling and
Servicing Agreement -- Servicing Compensation, Compensating Interest and Payment
of Expenses" herein.
 
     The interest portion of any Realized Losses (other than Excess Losses)
occurring prior to the Cross-Over Date will not be allocated among any
certificates, but will reduce the amount of Available Funds on the related
Distribution Date. As a result of the subordination of the junior certificates
in right of distribution, such losses will be borne first by the outstanding
junior certificates in inverse order of priority.
 
     If Available Funds are insufficient on any Distribution Date to distribute
the aggregate Accrued Certificate Interest on the senior certificates entitled
to distributions of interest to their certificateholders, any shortfall in
available amounts will be allocated among such classes of senior certificates in
proportion to the amounts of Accrued Certificate Interest otherwise
distributable thereon. The amount of any such undistributed Accrued Certificate
Interest will be added to the amount of interest to be distributed on the senior
certificates entitled to distributions of interest on subsequent Distribution
Dates in accordance with priority second under "-- Allocation of Available
Funds" above. No interest will accrue on any Accrued Certificate Interest
remaining undistributed from previous Distribution Dates.
 
Determination of LIBOR
 
     LIBOR will be determined on the second London banking day immediately
preceding the beginning of each Interest Accrual Period, other than the first
Interest Accrual Period. A London banking day is a date on which banks are open
for dealing in foreign currency and exchange in London. Each date on which LIBOR
is calculated is a "LIBOR Determination Date."
 
     LIBOR will be the rate, expressed as an annual percentage, for deposits in
U.S. Dollars for a period of one month that appears on Telerate Page 3750 as of
11:00 a.m., London time, on the relevant LIBOR Determination Date. This rate is
referred to as the British Bankers' Association Interest Settlement Rate. If a
rate does not appear on Telerate Page 3750 as of 11:00 a.m., London time, on the
applicable LIBOR Determination Date, the Trustee will request the principal
London office of each of four major reference banks in the London interbank
market selected by the Trustee to provide such banks' respective offered
quotations (expressed as a percentage per annum) to prime banks in the London
interbank market for deposits in U.S. Dollars for a period of one month as of
11:00 a.m., London time, on such LIBOR Determination Date. If at least two such
offered quotations are so provided, LIBOR will be the arithmetic mean of such
quotations. If fewer than two such quotations are so provided, the Trustee will
request each of three major banks in New York City selected by the Trustee to
provide such banks' respective rates (expressed as a percentage per annum) for
loans in U.S. Dollars to leading European banks for a period of one month as of
approximately 11:00 a.m., New York City time, on the first day of the Interest
Accrual Period. If on any LIBOR Determination
                                      S-29
<PAGE>   30
 
Date the Trustee is required but is unable to determine LIBOR in the manner
provided in the immediately preceding sentence, LIBOR for the related Interest
Accrual Period will be LIBOR as determined on the previous LIBOR Determination
Date, or, in the case of the first LIBOR Determination Date, 4.950% per annum.
 
     The establishment of LIBOR by the Trustee and the Trustee's subsequent
calculation of the rates of interest applicable to the LIBOR Certificates for
the relevant Interest Accrual Period, in the absence of manifest error, will be
final and binding. The interest rates on the LIBOR Certificates for any Interest
Accrual Period may be obtained by calling the Trustee at (617) 664-5500.
 
Principal
 
     Distributions in reduction of the principal balance of each certificate
other than the Class S Certificates will be made on each Distribution Date.
 
     All payments and other amounts received in respect of principal of the
mortgage loans will be allocated between (1) the senior certificates (other than
the Class PO and Class S Certificates) and the junior certificates, on the one
hand, and (2) the Class PO Certificates, on the other, in each case based on the
applicable Non-PO Percentage and the applicable PO Percentage, respectively, of
such amounts.
 
     The "Non-PO Percentage" with respect to any mortgage loan with a Net
Mortgage Rate ("NMR") less than 6.50% per annum (each such mortgage loan, a
"Discount Mortgage Loan") will be the fraction, expressed as a percentage, equal
to NMR / 6.50%. The "Non-PO Percentage" with respect to any mortgage loan with a
Net Mortgage Rate equal to or greater than 6.50% (each such mortgage loan, a
"Non-discount Mortgage Loan") will be 100%. The "PO Percentage" with respect to
any Discount Mortgage Loan will be the fraction, expressed as a percentage,
equal to (6.50% - NMR) / 6.50%. The "PO Percentage" with respect to any
Non-discount Mortgage Loan will be 0%.
 
     The initial Class Certificate Principal Balance of the Class PO
Certificates, which are not offered hereby, will be approximately $707,230,
subject to the variance described herein.
 
     Distributions in reduction of the Class Certificate Principal Balance of
each class of senior certificates entitled to principal distributions will be
made on each Distribution Date under priority third under "-- Allocation of
Available Funds" above. In accordance with priority third, the Available Funds
remaining after the distribution of interest will be allocated to such senior
certificates in an aggregate amount not to exceed the sum of the Senior Optimal
Principal Amount and the Class PO Principal Distribution Amount for such
Distribution Date. Distributions in reduction of the Class Certificate Principal
Balances of the Class M, Class B1 and Class B2 Certificates will be made
pursuant to priorities fifth, sixth and seventh, respectively, under
"-- Allocation of Available Funds" above. In accordance with each such priority,
the Available Funds, if any, remaining after distributions of principal and
interest on the senior certificates and payments in respect of the Class PO
Deferred Amount on such Distribution Date will be allocated to the Class M,
Class B1 and Class B2 Certificates in an amount equal to each such class's
Allocable Share for such Distribution Date, provided that no distribution of
principal will be made on any such class until any class ranking prior thereto
has received distributions of interest and principal, and such class has
received distributions of interest, on such Distribution Date. The Class A5
Certificates will not receive any distributions in respect of scheduled
payments, prepayments or other unscheduled recoveries of principal on the
 
                                      S-30
<PAGE>   31
 
mortgage loans during the first five years after the date of initial issuance of
the certificates, except as otherwise described herein on or following the
earlier of the Group I Final Distribution Date and the Cross-Over Date.
 
     The "Senior Optimal Principal Amount" with respect to each Distribution
Date will be an amount equal to the sum of:
 
          (1) the Senior Percentage (as defined herein) of the applicable Non-PO
     Percentage of all scheduled payments of principal due on each mortgage loan
     on the first day of the month in which the Distribution Date occurs, as
     specified in the amortization schedule at the time applicable thereto,
     after adjustment for previous principal prepayments and the principal
     portion of Debt Service Reductions after the Bankruptcy Coverage
     Termination Date, but before any adjustment to such amortization schedule
     by reason of any other bankruptcy or similar proceeding or any moratorium
     or similar waiver or grace period;
 
          (2) the Senior Prepayment Percentage (as defined herein) of the
     applicable Non-PO Percentage of the Scheduled Principal Balance of each
     mortgage loan which was the subject of a prepayment in full received by
     GECMSI, or, in the case of a mortgage loan master-serviced by GECMSI, of
     which GECMSI receives notice, during the applicable Prepayment Period (as
     defined below);
 
          (3) the Senior Prepayment Percentage of the applicable Non-PO
     Percentage of all partial prepayments of principal received during the
     applicable Prepayment Period;
 
          (4) the lesser of:
 
             (a) the Senior Prepayment Percentage of the applicable Non-PO
        Percentage of the sum of (w) the net liquidation proceeds allocable to
        principal on each mortgage loan which became a Liquidated Mortgage Loan
        during the related Prepayment Period, other than mortgage loans
        described in clause (x), and (x) the principal balance of each mortgage
        loan that was purchased by a private mortgage insurer during the related
        Prepayment Period as an alternative to paying a claim under the related
        insurance policy; and
 
             (b) the Senior Percentage of the applicable Non-PO Percentage of
        the sum of (w) the Scheduled Principal Balance of each mortgage loan
        which became a Liquidated Mortgage Loan during the related Prepayment
        Period, other than mortgage loans described in clause (x), and (x) the
        Scheduled Principal Balance of each mortgage loan that was purchased by
        a private mortgage insurer during the related Prepayment Period as an
        alternative to paying a claim under the related insurance policy minus
        (y) the Senior Percentage of the applicable Non-PO Percentage of the
        principal portion of Excess Losses (other than Debt Service Reductions)
        during the related Prepayment Period; and
 
          (5) the Senior Prepayment Percentage of the applicable Non-PO
     Percentage of the sum of (a) the Scheduled Principal Balance of each
     mortgage loan which was repurchased by GECMSI in connection with such
     Distribution Date and (b) the difference, if any, between the Scheduled
     Principal Balance of a mortgage loan that has been replaced by GECMSI with
     a substitute mortgage loan pursuant to the Agreement in connection with
     such Distribution Date and the Scheduled Principal Balance of such
     substitute mortgage loan.
 
     With respect to any mortgage loan that was the subject of a voluntary
prepayment in full and any Distribution Date, the "Prepayment Period" is the
period from the sixteenth
 
                                      S-31
<PAGE>   32
 
day of the month preceding the month of such Distribution Date (or, in the case
of the first Distribution Date, from the Cut-off Date) through the fifteenth day
of the month of such Distribution Date. With respect to any other unscheduled
prepayment of principal of any mortgage loan and any Distribution Date, the
"Prepayment Period" is the month preceding the month of such Distribution Date.
 
     The "Class A5 Principal Distribution Amount" for any Distribution Date will
equal the product of (1) the Senior Optimal Principal Amount for such date
multiplied by (2) the Class A5 Percentage for such date multiplied by (3) the
Class A5 Distribution Percentage for such date. Notwithstanding the foregoing,
on the Group I Final Distribution Date, the Class A5 Principal Distribution
Amount will be increased by any Senior Optimal Principal Amount remaining after
distributions of principal have been made on the Group I Senior Certificates,
and following the Group I Final Distribution Date, the Class A5 Principal
Distribution Amount will equal the Senior Optimal Principal Amount.
 
     The "Class A5 Percentage" for any Distribution Date will equal the
percentage obtained by dividing (1) the aggregate Certificate Principal Balance
of the Class A5 Certificates immediately preceding such Distribution Date by (2)
the aggregate Certificate Principal Balance of all the senior certificates
(other than the Class PO Certificates) immediately preceding such Distribution
Date. The initial Class A5 Percentage is expected to be approximately 10.01%.
 
     The "Class A5 Distribution Percentage" for any Distribution Date will equal
0% through the Distribution Date in March 2004; 30% thereafter through the
Distribution Date in March 2005; 40% thereafter through the Distribution Date in
March 2006; 60% thereafter through the Distribution Date in March 2007; 80%
thereafter through the Distribution Date in March 2008; and 100% thereafter.
 
     The "Group I Final Distribution Date" is the Distribution Date on which the
Class Certificate Principal Balance of each of the Group I Senior Certificates
has been reduced to zero.
 
     The "Senior Percentage" on any Distribution Date will equal the lesser of
100% and the percentage (carried to six places rounded up) obtained by dividing
the aggregate Certificate Principal Balances of all the senior certificates
(other than the Class PO Certificates) immediately preceding such Distribution
Date by the aggregate Certificate Principal Balances of all the certificates
(other than the Class PO Certificates) immediately preceding such Distribution
Date. The initial Senior Percentage is expected to be approximately 95.99%.
 
                                      S-32
<PAGE>   33
 
     The "Senior Prepayment Percentage" on any Distribution Date occurring
during the periods set forth below will be as follows:
 
<TABLE>
<CAPTION>
PERIOD (DATES INCLUSIVE)         SENIOR PREPAYMENT PERCENTAGE
- ------------------------         -----------------------------
<S>                              <C>
April 1999 -- March 2004.....    100%
April 2004 -- March 2005.....    Senior Percentage plus 70% of
                                 the Junior Percentage
April 2005 -- March 2006.....    Senior Percentage plus 60% of
                                 the Junior Percentage
April 2006 -- March 2007.....    Senior Percentage plus 40% of
                                 the Junior Percentage
April 2007 -- March 2008.....    Senior Percentage plus 20% of
                                 the Junior Percentage
April 2008 and thereafter....    Senior Percentage
</TABLE>
 
     Notwithstanding the foregoing, if the Senior Percentage on any Distribution
Date exceeds the initial Senior Percentage, the Senior Prepayment Percentage for
such Distribution Date will equal 100%.
 
     In addition, no reduction of the Senior Prepayment Percentage below the
level in effect for the most recent prior period specified in the table above
shall be effective on any Distribution Date (such limitation being the "Senior
Prepayment Percentage Stepdown Limitation") unless, as of the last day of the
month preceding such Distribution Date, either:
 
          (A) (1) the aggregate Scheduled Principal Balance of mortgage loans
     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) does not exceed 50% of
     the aggregate Class Certificate Principal Balance of the junior
     certificates as of such date; and
 
               (2) cumulative Realized Losses do not exceed:
 
                  (a) 30% of the aggregate Class Certificate Principal Balance
             of the junior certificates as of the date of issuance of the
             certificates (the "Original Junior Principal Balance") if such
             Distribution Date occurs between and including April 2004 and March
             2005;
 
                  (b) 35% of the Original Junior Principal Balance if such
             Distribution Date occurs between and including April 2005 and March
             2006;
 
                  (c) 40% of the Original Junior Principal Balance if such
             Distribution Date occurs between and including April 2006 and March
             2007;
 
                  (d) 45% of the Original Junior Principal Balance if such
             Distribution Date occurs between and including April 2007 and March
             2008; and
 
                  (e) 50% of the Original Junior Principal Balance if such
             Distribution Date occurs during or after April 2008; or
 
          (B) (1) the aggregate Scheduled Principal Balance of mortgage loans
     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), averaged over the last
     three months, as a percentage of the
 
                                      S-33
<PAGE>   34
 
     aggregate Scheduled Principal Balance of all mortgage loans averaged over
     the last three months, does not exceed 4%; and
 
               (2) cumulative Realized Losses do not exceed:
 
                  (a) 10% of the Original Junior Principal Balance if such
             Distribution Date occurs between and including April 2004 and March
             2005;
 
                  (b) 15% of the Original Junior Principal Balance if such
             Distribution Date occurs between and including April 2005 and March
             2006;
 
                  (c) 20% of the Original Junior Principal Balance if such
             Distribution Date occurs between and including April 2006 and March
             2007;
 
                  (d) 25% of the Original Junior Principal Balance if such
             Distribution Date occurs between and including April 2007 and March
             2008; and
 
                  (e) 30% of the Original Junior Principal Balance if such
             Distribution Date occurs during or after April 2008.
 
     The "Class PO Principal Distribution Amount" with respect to each
Distribution Date will be an amount equal to the sum of:
 
          (1) the applicable PO Percentage of all scheduled payments of
     principal due on each mortgage loan on the first day of the month in which
     the Distribution Date occurs, as specified in the amortization schedule at
     the time applicable thereto, after adjustment for previous principal
     prepayments and the principal portion of Debt Service Reductions after the
     Bankruptcy Coverage Termination Date, but before any adjustment to such
     amortization schedule by reason of any other bankruptcy or similar
     proceeding or any moratorium or similar waiver or grace period;
 
          (2) the applicable PO Percentage of the Scheduled Principal Balance of
     each mortgage loan which was the subject of a prepayment in full received
     by GECMSI, or, in the case of a mortgage loan master-serviced by GECMSI, of
     which GECMSI receives notice, during the related Prepayment Period;
 
          (3) the applicable PO Percentage of all partial prepayments of
     principal received during the related Prepayment Period;
 
          (4) the applicable PO Percentage of the sum of (a) the net liquidation
     proceeds allocable to principal on each mortgage loan which became a
     Liquidated Mortgage Loan during the related Prepayment Period, other than
     mortgage loans described in clause (b), and (b) the principal balance of
     each mortgage loan that was purchased by a private mortgage insurer during
     the related Prepayment Period as an alternative to paying a claim under the
     related insurance policy; and
 
          (5) the applicable PO Percentage of the sum of (a) the Scheduled
     Principal Balance of each mortgage loan which was repurchased by GECMSI in
     connection with such Distribution Date and (b) the difference, if any,
     between the Scheduled Principal Balance of a mortgage loan that has been
     replaced by GECMSI with a substitute mortgage loan pursuant to the
     Agreement in connection with such Distribution Date and the Scheduled
     Principal Balance of such substitute mortgage loan.
 
                                      S-34
<PAGE>   35
 
For purposes of clauses (2) and (5) above, the Scheduled Principal Balance of a
mortgage loan will be reduced by the amount of any Deficient Valuation that
occurred on or before the Bankruptcy Coverage Termination Date.
 
     The "Junior Percentage" on any Distribution Date will equal 100% minus the
Senior Percentage. The "Junior Prepayment Percentage" will equal 100% minus the
Senior Prepayment Percentage, except that on any Distribution Date after the
respective Class Certificate Principal Balances of the senior certificates
(other than the Class PO Certificates) have each been reduced to zero (the
"Senior Final Distribution Date"), the Junior Prepayment Percentage will equal
100%. The initial Junior Percentage is expected to be approximately 4.01%.
 
     The "Junior Optimal Principal Amount" with respect to each Distribution
Date will be an amount equal to the sum of the following (but in no event
greater than the aggregate Class Certificate Principal Balances of the junior
certificates immediately prior to such Distribution Date):
 
          (1) the Junior Percentage of the applicable Non-PO Percentage of all
     scheduled payments of principal due on each outstanding mortgage loan on
     the first day of the month in which the Distribution Date occurs, as
     specified in the amortization schedule at the time applicable thereto,
     after adjustment for previous principal prepayments and the principal
     portion of Debt Service Reductions after the Bankruptcy Coverage
     Termination Date, but before any adjustment to such amortization schedule
     by reason of any other bankruptcy or similar proceeding or any moratorium
     or similar waiver or grace period;
 
          (2) the Junior Prepayment Percentage of the applicable Non-PO
     Percentage of the Scheduled Principal Balance of each mortgage loan which
     was the subject of a prepayment in full received by GECMSI, or, in the case
     of a mortgage loan master-serviced by GECMSI, of which GECMSI receives
     notice, during the related Prepayment Period;
 
          (3) the Junior Prepayment Percentage of the applicable Non-PO
     Percentage of all partial prepayments of principal received during the
     related Prepayment Period, plus, on the Senior Final Distribution Date,
     100% of any Senior Optimal Principal Amount remaining undistributed on such
     date;
 
          (4) the amount, if any, by which the sum of (a) the applicable Non-PO
     Percentage of the net liquidation proceeds allocable to principal received
     during the related Prepayment Period in respect of each Liquidated Mortgage
     Loan, other than mortgage loans described in clause (b), and (b) the
     applicable Non-PO Percentage of the principal balance of each mortgage loan
     that was purchased by a private mortgage insurer during the related
     Prepayment Period as an alternative to paying a claim under the related
     insurance policy exceeds (c) the sum of the amounts distributable to senior
     certificateholders (other than the holders of the Class PO Certificates)
     under clause (4) of the definition of Senior Optimal Principal Amount on
     such Distribution Date; and
 
          (5) the Junior Prepayment Percentage of the applicable Non-PO
     Percentage of the sum of (a) the Scheduled Principal Balance of each
     mortgage loan which was repurchased by GECMSI in connection with such
     Distribution Date and (b) the difference, if any, between the Scheduled
     Principal Balance of a mortgage loan that has been replaced by GECMSI with
     a substitute mortgage loan pursuant to the
 
                                      S-35
<PAGE>   36
 
     Agreement in connection with such Distribution Date and the Scheduled
     Principal Balance of such substitute mortgage loan.
 
     The "Allocable Share" with respect to any class of junior certificates on
any Distribution Date will generally equal such class's pro rata share (based on
the class Certificate Principal Balance of each class entitled thereto) of each
of the components of the Junior Optimal Principal Amount described above;
provided, that, except as described in the second succeeding sentence, no Class
B1, Class B2, Class B3, Class B4 or Class B5 Certificate (together, the "Class B
Certificates") shall be entitled on any Distribution Date to receive
distributions pursuant to clauses (2), (3) and (5) of the definition of Junior
Optimal Principal Amount unless the Class Prepayment Distribution Trigger for
the related class is satisfied for such Distribution Date.
 
     The "Class Prepayment Distribution Trigger" for a class of Class B
Certificates for any Distribution Date is satisfied if the fraction (expressed
as a percentage), the numerator of which is the aggregate Class Certificate
Principal Balance of such class and each class subordinate thereto, if any, and
the denominator of which is the Pool Scheduled Principal Balance with respect to
such Distribution Date, equals or exceeds such percentage calculated as of the
date of issuance of the certificates. If, on any Distribution Date, the Class
Certificate Principal Balance of the Class M Certificates or of any class of
Class B Certificates for which the related Class Prepayment Distribution Trigger
was satisfied on such Distribution Date is reduced to zero, any amounts
distributable to such class under clauses (2), (3) and (5) of the definition of
Junior Optimal Principal Amount, to the extent of such class's remaining
Allocable Share, shall be distributed to the remaining classes of junior
certificates in reduction of their respective Class Certificate Principal
Balances in order of priority. If the Class Prepayment Distribution Trigger is
not satisfied for any class of Class B Certificates on any Distribution Date,
this may have the effect of accelerating the amortization of more senior ranking
classes of junior certificates because the amount otherwise distributable to
such class under clauses (2), (3) and (5) of the definition of Junior Optimal
Principal Amount will be distributable among the outstanding Class M
Certificates and each class of the Class B Certificates as to which the related
Class Prepayment Distribution Trigger has been satisfied on a pro rata basis
subject to the priority of payments described herein. On any Distribution Date,
any reduction in funds available for distribution to the classes of junior
certificates resulting from a distribution of the Class PO Deferred Amount to
the Class PO Certificates will be allocated to the classes of junior
certificates, in reduction of the Allocable Shares thereof, in inverse order of
priority.
 
Example of Distributions
 
     For an example of hypothetical distributions on the certificates for a
particular Distribution Date, see "Description of the Certificates -- Example of
Distributions" in the accompanying prospectus.
 
ALLOCATION OF REALIZED LOSSES ON THE CERTIFICATES
 
     A "Realized Loss" with respect to a mortgage loan is either:
 
          - a Bankruptcy Loss (as defined below) or
 
          - as to any Liquidated Mortgage Loan, the unpaid principal balance
     thereof plus accrued and unpaid interest thereon at the Net Mortgage Rate
     through the last day of the month of liquidation, less the net proceeds
     from the liquidation of, and any insurance proceeds from, such mortgage
     loan and the related mortgaged property. A
                                      S-36
<PAGE>   37
 
     "Liquidated Mortgage Loan" is any defaulted mortgage loan as to which
     GECMSI has determined that all amounts which it expects to recover from or
     on account of such mortgage loan have been recovered.
 
     In the event of a personal bankruptcy of a mortgagor, the bankruptcy court
may establish the value of the mortgaged property at an amount less than the
then outstanding principal balance of the mortgage loan secured by such
mortgaged property and could reduce the secured debt to such value. In such
case, the trust, as the holder of such mortgage loan, would become an unsecured
creditor to the extent of the difference between the outstanding principal
balance of such mortgage loan and such reduced secured debt (such difference, a
"Deficient Valuation"). In addition, certain other modifications of the terms of
a mortgage loan can result from a bankruptcy proceeding, including the reduction
of the amount of the monthly payment on the related mortgage loan (a "Debt
Service Reduction").
 
     A "Bankruptcy Loss" with respect to any mortgage loan is a Deficient
Valuation or Debt Service Reduction.
 
     A "Fraud Loss" is any Realized Loss attributable to fraud in the
origination of the related mortgage loan.
 
     A "Special Hazard Loss" is a Realized Loss attributable to damage or a
direct physical loss suffered by a mortgaged property -- including any Realized
Loss due to the presence or suspected presence of hazardous wastes or substances
on a mortgaged property -- other than any such damage or loss covered by a
hazard policy or a flood insurance policy required to be maintained in respect
of such mortgaged property under the Agreement or any loss due to normal wear
and tear or certain other causes.
 
     On each Distribution Date, the applicable PO Percentage of the principal
portion of any Realized Loss (including any Excess Loss, but not including any
Debt Service Reduction) on a Discount Mortgage Loan will be allocated to the
Class PO Certificates until the Class Certificate Principal Balance thereof is
reduced to zero. With respect to any Distribution Date through the Cross-Over
Date, the aggregate of all amounts so allocable to the Class PO Certificates on
such date in respect of Realized Losses other than Excess Losses in respect of
the Discount Mortgage Loans and all amounts previously allocated in respect of
such losses to the Class PO Certificates and not distributed on prior
Distribution Dates will be the "Class PO Deferred Amount."
 
     To the extent funds are available therefor on any Distribution Date through
the Cross-Over Date, distributions in respect of the Class PO Deferred Amount
will be made on the Class PO Certificates in accordance with priority fourth
under "-- Distributions on the Certificates -- Allocation of Available Funds"
above. Any distribution of Available Funds in respect of the Class PO Deferred
Amount will not reduce the Class Certificate Principal Balance of the Class PO
Certificates. No interest will accrue on the Class PO Deferred Amount. On each
Distribution Date through the Cross-Over Date, the Class Certificate Principal
Balance of the lowest ranking class of junior certificates then outstanding will
be reduced by the amount of any distributions in respect of the Class PO
Deferred Amount on such Distribution Date, through the operation of the Class PO
Deferred Payment Writedown Amount. After the Cross-Over Date, no distributions
will be made in respect of, and losses allocated to the Class PO Certificates
will not be added to, the Class PO Deferred Amount. Any distribution of
Unanticipated Recoveries (as defined in the accompanying prospectus) on the
Class PO Certificates will be adjusted to take into account the Class PO
Deferred Amount previously paid to such class as specified in the
 
                                      S-37
<PAGE>   38
 
Agreement. See "Servicing of the Mortgage Loans -- Unanticipated Recoveries of
Losses on the Mortgage Loans" in the accompanying prospectus.
 
     The applicable Non-PO Percentage of the principal portion of any Realized
Loss (other than an Excess Loss or a Debt Service Reduction) on a mortgage loan
for any Distribution Date will not be allocated to any senior certificates until
the Cross-Over Date. Prior to the Cross-Over Date (and on such date under
certain circumstances), the applicable Non-PO Percentage of the principal
portion of any such Realized Loss will be allocated among the outstanding
classes of junior certificates, in inverse order of priority, until the Class
Certificate Principal Balance of each such class has been reduced to zero (i.e.,
such Realized Losses will be allocated first to the Class B5 Certificates while
such certificates are outstanding, second to the Class B4 Certificates, and so
on). The applicable Non-PO Percentage of the principal portion of any Excess
Loss (other than a Debt Service Reduction) on a mortgage loan for any
Distribution Date will be allocated pro rata among all outstanding classes of
certificates entitled to principal distributions (other than the Class PO
Certificates) based on their Class Certificate Principal Balances.
 
     An "Excess Loss" is any Bankruptcy Loss, Fraud Loss and Special Hazard Loss
(each a type of Realized Loss) occurring after the Bankruptcy Coverage
Termination Date, Fraud Coverage Termination Date and Special Hazard Termination
Date, respectively, as described more fully below. Commencing on the Cross-Over
Date, the applicable Non-PO Percentage of the principal portion of any Realized
Loss (other than a Debt Service Reduction) will be allocated among the
outstanding classes of senior certificates entitled to principal distributions
(other than the Class PO Certificates) pro rata based upon their Class
Certificate Principal Balances.
 
     No reduction of the Class Certificate Principal Balance of any class shall
be made on any Distribution Date on account of any Realized Loss to the extent
that such reduction would have the effect of reducing the aggregate Certificate
Principal Balance of all of the certificates as of such Distribution Date to an
amount less than the Pool Scheduled Principal Balance as of the first day of the
month of such Distribution Date, less any Deficient Valuations occurring on or
prior to the Bankruptcy Coverage Termination Date (such limitation being the
"Loss Allocation Limitation").
 
     The principal portion of Debt Service Reductions will not be allocated in
reduction of the Certificate Principal Balance of any certificate. However,
after the Bankruptcy Coverage Termination Date, the amounts distributable under
clause (1) of the definitions of Senior Optimal Principal Amount, Class PO
Principal Distribution Amount and Junior Optimal Principal Amount will be
reduced by the amount of the principal portion of any Debt Service Reductions.
Regardless of when they occur, Debt Service Reductions may reduce the amount of
Available Funds otherwise available for distribution on a Distribution Date. As
a result of the subordination of the junior certificates in right of
distribution, any Debt Service Reductions prior to the Bankruptcy Coverage
Termination Date will be borne by the junior certificates (to the extent then
outstanding) in inverse order of priority. All allocations of Realized Losses to
a class of certificates will be accomplished on a Distribution Date by reducing
the applicable Class Certificate Principal Balance by the appropriate pro rata
share of any such losses occurring during the month preceding the month of such
Distribution Date and, accordingly, will be taken into account in determining
the distributions of principal and interest on the certificates commencing on
the following Distribution Date, except that the aggregate amount of the
principal portion of any Realized Losses (other than Excess Losses and Debt
Service Reductions) to be allocated to the Class PO Certificates on any
Distribution Date through the Cross-Over
 
                                      S-38
<PAGE>   39
 
Date will also be taken into account in determining distributions in respect of
the Class PO Deferred Amount for such Distribution Date.
 
     The interest portion of all Realized Losses will be allocated among the
outstanding classes of certificates that are entitled to distributions of
interest to the extent described under "-- Distributions on the
Certificates -- Interest" above.
 
     The applicable Non-PO Percentage of any Deficient Valuation will on each
Distribution Date be allocated solely to the outstanding junior certificates
until the Bankruptcy Coverage Termination Date. The "Bankruptcy Coverage
Termination Date" is the Distribution Date upon which the Bankruptcy Loss Amount
has been reduced to zero or a negative number (or the Cross-Over Date, if
earlier). On each Distribution Date, the "Bankruptcy Loss Amount" will equal
approximately $157,753 (approximately 0.03% of the aggregate Scheduled Principal
Balances of the mortgage loans as of the Cut-off Date), subject to reduction as
described in the Agreement, minus the aggregate amount of previous Bankruptcy
Losses. The Bankruptcy Loss Amount and the manner of reduction thereof described
in the Agreement may be reduced or modified upon written confirmation from Fitch
and S&P (each as defined herein) that such reduction or modification will not
adversely affect the then current ratings of the senior certificates by Fitch
and S&P. Such reduction may adversely affect the coverage provided by
subordination with respect to Bankruptcy Losses.
 
     The applicable Non-PO Percentage of any Fraud Loss will on each
Distribution Date be allocated solely to the outstanding junior certificates
until the Fraud Coverage Termination Date. The "Fraud Coverage Termination Date"
is the Distribution Date upon which the Fraud Loss Amount has been reduced to
zero or a negative number (or the Cross-Over Date, if earlier). Upon the initial
issuance of the certificates, the "Fraud Loss Amount" will equal approximately
$5,000,825 (approximately 1.00% of the aggregate Scheduled Principal Balances of
the mortgage loans as of the Cut-off Date). As of any Distribution Date prior to
the first anniversary of the Cut-off Date, the Fraud Loss Amount will equal
approximately $5,000,825, minus the aggregate amount of Fraud Losses that would
have been allocated to the junior certificates in the absence of the Loss
Allocation Limitation since the Cut-off Date.
 
     As of any Distribution Date from the first to the fifth anniversaries of
the Cut-off Date, the Fraud Loss Amount will equal (1) the lesser of (a) the
Fraud Loss Amount as of the most recent anniversary of the Cut-off Date and (b)
1% (from the first to but excluding the third anniversaries of the Cut-off Date)
or 0.5% (from and including the third to but excluding the fifth anniversaries
of the Cut-off Date) of the aggregate outstanding principal balance of all of
the mortgage loans as of the most recent anniversary of the Cut-off Date minus
(2) the Fraud Losses that would have been allocated to the junior certificates
in the absence of the Loss Allocation Limitation since the most recent
anniversary of the Cut-off Date. As of any Distribution Date on or after the
fifth anniversary of the Cut-off Date, the Fraud Loss Amount shall be zero.
 
     The applicable Non-PO Percentage of any Special Hazard Loss will on each
Distribution Date be allocated solely to the outstanding junior certificates
until the Special Hazard Termination Date. The "Special Hazard Termination Date"
is the Distribution Date upon which the Special Hazard Loss Amount has been
reduced to zero or a negative number (or the Cross-Over Date, if earlier). Upon
the initial issuance of the certificates, the "Special Hazard Loss Amount" will
equal approximately $6,352,015 (approximately 1.27% of the aggregate Scheduled
Principal Balances of the mortgage loans as of the Cut-off Date). As of any
Distribution Date, the Special Hazard Loss Amount will equal
                                      S-39
<PAGE>   40
 
approximately $6,352,015 minus the sum of (1) the aggregate amount of Special
Hazard Losses that would have been previously allocated to the junior
certificates in the absence of the Loss Allocation Limitation and (2) the
Adjustment Amount. For each anniversary of the Cut-off Date, the "Adjustment
Amount" shall be equal to the amount, if any, by which the Special Hazard Loss
Amount (without giving effect to the deduction of the Adjustment Amount for such
anniversary) exceeds the lesser of:
 
          (a) an amount calculated by GECMSI and approved by each of Fitch and
     S&P, which amount shall not be less than $500,000; and
 
          (b) the greater of (x) 1% (or if greater than 1%, the highest
     percentage of mortgage loans by principal balance secured by mortgaged
     properties in any California zip code) of the outstanding principal balance
     of all the mortgage loans on the Distribution Date immediately preceding
     such anniversary and (y) twice the outstanding principal balance of the
     mortgage loan which has the largest outstanding principal balance on the
     Distribution Date immediately preceding such anniversary.
 
ADDITIONAL RIGHTS OF THE RESIDUAL CERTIFICATEHOLDERS
 
     In addition to distributions of principal and interest, the holders of the
Class R Certificates will be entitled to receive:
 
          (1) the amount, if any, of Available Funds remaining in the REMIC on
     any Distribution Date after distributions of interest and principal and in
     respect of the Class PO Deferred Amount are made on the certificates on
     such date;
 
          (2) the amount of any unanticipated recoveries received by GECMSI in
     the calendar month preceding the month of a Distribution Date and not
     otherwise allocated to the other classes of certificates as described in
     "Servicing of the Mortgage Loans -- Unanticipated Recoveries of Losses on
     the Mortgage Loans" in the accompanying prospectus; and
 
          (3) the proceeds, if any, of the assets of the trust remaining in the
     REMIC after the Class Certificate Principal Balances of all classes of
     certificates have each been reduced to zero.
 
     It is not anticipated that any material assets will be remaining for such
distributions on the Class R Certificates at any such time. See "Federal Income
Tax Consequences -- Residual Certificates" herein.
 
SUBORDINATION
 
Priority of Senior Certificates
 
     As of the date of the initial issuance of the certificates, the aggregate
Certificate Principal Balance of the junior certificates will equal
approximately 4.00% of the aggregate Certificate Principal Balance of all the
classes of certificates. The rights of the holders of the junior certificates to
receive distributions with respect to the mortgage loans will be
 
                                      S-40
<PAGE>   41
 
subordinate to such rights of the holders of the senior certificates, to the
extent described above. The subordination of the junior certificates is
intended:
 
          (1) to enhance the likelihood of timely receipt by the holders of the
     senior certificates (to the extent of the subordination of the junior
     certificates) of the full amount of the scheduled monthly distributions of
     principal and interest allocable to the senior certificates; and
 
          (2) to afford the holders of the senior certificates (to the extent of
     the subordination of the junior certificates) protection against Realized
     Losses, to the extent described above.
 
     If Realized Losses exceed the credit support provided to the senior
certificates through subordination, or if Excess Losses occur, all or a portion
of such losses will be borne by the senior certificates.
 
     The protection afforded to the holders of senior certificates by means of
the subordination feature will be accomplished by:
 
          (1) the preferential right of such holders to receive, prior to any
     distribution being made on a Distribution Date in respect of the junior
     certificates, in accordance with the paydown rules specified above under
     "-- Distributions on the Certificates -- Allocation of Available Funds,"
     the amounts due to the senior certificateholders on each Distribution Date
     out of the Available Funds with respect to such date and, if necessary, by
     the right of such holders to receive future distributions on the mortgage
     loans that would otherwise have been payable to the holders of the junior
     certificates;
 
          (2) the allocation to the junior certificates of the principal portion
     of the applicable Non-PO Percentage of any Realized Loss (other than an
     Excess Loss or a Debt Service Reduction) to the extent set forth herein;
     and
 
          (3) the allocation to the junior certificates of the applicable PO
     Percentage of the principal portion of any Realized Loss (other than an
     Excess Loss or a Debt Service Reduction) to the extent set forth herein
     through the operation of the Class PO Deferred Payment Writedown Amount.
 
     The allocation of the principal portion of Realized Losses (as set forth
herein) to the junior certificates on any Distribution Date will decrease the
protection provided to the senior certificates then outstanding on future
Distribution Dates by reducing the aggregate Certificate Principal Balance of
the junior certificates then outstanding.
 
     In addition, in order to extend the period during which the junior
certificates remain available as credit enhancement for the senior certificates,
the entire amount of the applicable Non-PO Percentage of any prepayment or other
unscheduled recovery of principal with respect to a mortgage loan will be
allocated to the senior certificates entitled to principal distributions (other
than the Class PO Certificates) during at least the first five years after the
date of initial issuance of the certificates, with such allocation being subject
to reduction thereafter as described herein. This allocation has the effect of
accelerating the amortization of such senior certificates as a group while, in
the absence of losses in respect of the mortgage loans, increasing the
percentage interest in the principal balance of the mortgage loans evidenced by
the junior certificates. Among such senior certificates, such amounts will be
allocated to the outstanding Group I Senior Certificates during the first five
years after the date of initial issuance of the certificates (except as
otherwise described herein on or following the Group I Final Distribution Date)
with such allocation being subject to reduction thereafter as described herein,
except that such
 
                                      S-41
<PAGE>   42
 
amounts will be allocated pro rata among all of the outstanding senior
certificates (other than the Class PO and Class S Certificates) on each
Distribution Date after the Cross-Over Date.
 
     After the payment of amounts distributable in respect of the senior
certificates on each Distribution Date, the junior certificates will be entitled
on such date to the remaining portion, if any, of the Available Funds in an
aggregate amount equal to the Accrued Certificate Interest on the junior
certificates for such date, any remaining undistributed Accrued Certificate
Interest thereon from previous Distribution Dates and the sum of the Allocable
Shares of the classes of junior certificates. Amounts so distributed to junior
certificateholders will not be available to cover any delinquencies or any
Realized Losses in respect of subsequent Distribution Dates.
 
Priority Among Junior Certificates
 
     As of the date of the initial issuance of the certificates, the aggregate
Certificate Principal Balance of the Class B3, Class B4 and Class B5
Certificates, all of which are subordinate in right of distribution to the
junior certificates offered hereby, will equal approximately 0.95% of the
initial aggregate Certificate Principal Balance of all of the certificates and
approximately 23.75% of the initial aggregate Certificate Principal Balance of
all of the junior certificates. On each Distribution Date, the holders of any
particular class of junior certificates, other than the Class B5 Certificates,
will have a preferential right to receive the amounts due them on such
Distribution Date out of Available Funds, prior to any distribution being made
on such date on each class of certificates ranking junior to such class. In
addition, except as described herein, the applicable Non-PO Percentage of the
principal portion of any Realized Loss with respect to a mortgage loan (other
than a Debt Service Reduction or an Excess Loss) and any Class PO Deferred
Payment Writedown Amount will be allocated, to the extent set forth herein, in
reduction of the Class Certificate Principal Balances of the junior certificates
in inverse order of priority of such certificates. The effect of the allocation
of such Realized Losses and of the Class PO Deferred Payment Writedown Amount to
a class of junior certificates will be to reduce future distributions allocable
to such class and increase the relative portion of distributions allocable to
more senior classes of certificates.
 
     In order to maintain the relative levels of subordination among the junior
certificates, the applicable Non-PO Percentage of prepayments and certain other
unscheduled recoveries of principal in respect of the mortgage loans (which will
not be distributable to such certificates for at least the first five years
after the date of initial issuance of the certificates, except as otherwise
described herein on or following the Senior Final Distribution Date) will not be
distributable to the holders of any class of Class B Certificates on any
Distribution Date for which the related Class Prepayment Distribution Trigger is
not satisfied, except as described above. See "-- Distributions on the
Certificates -- Principal." If the Class Prepayment Distribution Trigger is not
satisfied with respect to any class of Class B Certificates, the amortization of
more senior ranking classes of junior certificates may occur more rapidly than
would otherwise have been the case and, in the absence of losses in respect of
the mortgage loans, the percentage interest in the principal balance of the
mortgage loans evidenced by such Class B Certificates may increase.
 
     As a result of the subordination of any class of certificates, such class
of certificates will be more sensitive than more senior ranking classes of
certificates to the rate of
 
                                      S-42
<PAGE>   43
 
delinquencies and defaults on the mortgage loans, and under certain
circumstances investors in such certificates may not recover their initial
investment.
 
RESTRICTIONS ON TRANSFER OF THE RESIDUAL CERTIFICATES
 
     The residual certificates will be subject to the restrictions on transfer
described in the prospectus under "Federal Income Tax Consequences -- REMIC
Certificates -- Transfers of Residual Certificates-- Disqualified
Organizations," "-- Foreign Investors" and "-- Noneconomic Residual Interests."
In addition, the Agreement provides that the residual certificates may not be
acquired by an ERISA Plan. The residual certificates will contain a legend
describing the foregoing restrictions.
 
YIELD AND WEIGHTED AVERAGE LIFE CONSIDERATIONS
 
YIELD
 
     The effective yield on the certificates will depend upon, among other
things, the price at which the certificates are purchased and the rate and
timing of payments of principal (including both scheduled and unscheduled
payments) of the mortgage loans underlying the certificates. You should refer to
"Yield, Maturity and Weighted Average Life Considerations" in the prospectus and
the following text for a discussion of the factors that could affect the yield
of your certificates.
 
PREPAYMENTS
 
     The rate of distribution of principal of the certificates (and the
aggregate amount of interest payable on the Class S Certificates) will be
affected primarily by the amount and timing of principal payments received on or
in respect of the mortgage loans. Such principal payments will include scheduled
payments as well as voluntary prepayments by borrowers (such as, for example,
prepayments in full due to refinancings, including refinancings made by GECMSI
in the ordinary course of conducting its mortgage banking business, some of
which refinancings may be solicited by GECMSI, or prepayments in connection with
biweekly payment programs, participation in which may be solicited by GECMSI)
and prepayments resulting from foreclosure, condemnation and other dispositions
of the mortgaged properties, from repurchase by GECMSI of any mortgage loan as
to which there has been a material breach of warranty or defect in documentation
(or deposit of certain amounts in respect of delivery of a substitute mortgage
loan therefor) and from an exercise by GECMSI of its option to repurchase a
Defaulted Mortgage Loan.
 
     Mortgagors are permitted to prepay the mortgage loans, in whole or in part,
at any time without penalty. In addition, as a result of the fact that
certificateholders (other than holders of Class S Certificates) will generally
be entitled on any Distribution Date to receive from Available Funds
distributions of amounts based on clause (4) of each of the definitions of
Senior Optimal Principal Amount, Class PO Principal Distribution Amount or
Junior Optimal Principal Amount, as the case may be, the occurrence of defaults
on the mortgage loans may produce the same effect on the certificates receiving
such distributions as an early receipt of principal. See "Yield, Maturity and
Weighted Average Life Considerations" in the prospectus for a discussion of the
factors that may influence prepayment rates.
 
     Voluntary prepayments in full of principal on the mortgage loans received
by GECMSI (or, in the case of mortgage loans master-serviced by GECMSI, of which
GECMSI receives notice) from the first day through the fifteenth day of each
month (other than the month of the Cut-off Date) are passed through to the
certificateholders in
                                      S-43
<PAGE>   44
 
the month of receipt or payment. Voluntary prepayments of principal in full
received from the sixteenth day (or, in the case of the month of the Cut-off
Date, from the Cut-off Date) through the last day of each month, and all
voluntary partial prepayments of principal on the mortgage loans are passed
through to the certificateholders in the month following the month of receipt or
payment. Any prepayment of a mortgage loan or liquidation of a mortgage loan (by
foreclosure proceedings or by virtue of the purchase of a mortgage loan in
advance of its stated maturity as required or permitted by the Agreement) will
generally have the effect of passing through to the certificateholders principal
amounts (or, in the case of Class S Certificates, reducing the Notional
Principal Balance thereof) which would otherwise be passed through (or reduced)
in amortized increments over the remaining term of such mortgage loan.
 
     The entire amount of the applicable Non-PO Percentage of any prepayments
and other unscheduled recoveries of principal with respect to a mortgage loan
will be allocated solely to the outstanding senior certificates (other than the
Class PO and Class S Certificates) during at least the first five years after
the date of initial issuance of the certificates, with such allocation being
subject to reduction thereafter as described herein. Among such senior
certificates, such amounts will be allocated solely to the outstanding Group I
Senior Certificates during the first five years after the date of initial
issuance of the certificates (except as otherwise described herein on or
following the Group I Final Distribution Date), with such allocation being
subject to reduction thereafter as described herein, provided that such amounts
will be allocated pro rata among all the outstanding senior certificates (other
than the Class PO and Class S Certificates) on each Distribution Date after the
Cross-Over Date. The resulting allocation between the Group I Senior
Certificates and the Class A5 Certificates is designed to accelerate the
allocation of principal prepayments and certain other unscheduled recoveries of
principal on the mortgage loans to holders of the Group I Senior Certificates
relative to the Class A5 Certificates through the earlier of the Group I Final
Distribution Date and the Cross-Over Date. In addition, the Class A5
Certificates will not receive any distributions of scheduled principal payments
during the first five years after the date of initial issuance of the
certificates, except as otherwise described herein on or following the earlier
of the Group I Final Distribution Date and the Cross-Over Date. Notwithstanding
the foregoing, all distributions of principal on the outstanding senior
certificates (other than the Class PO and Class S Certificates) will be made pro
rata among such certificates on each Distribution Date after the Cross-Over
Date. See "Description of the Certificates -- Distributions on the
Certificates -- Principal" herein.
 
     When a full prepayment is made on a mortgage loan, the mortgagor is charged
interest ("Prepayment Interest") on the days in the month actually elapsed up to
the date of such prepayment, at a daily interest rate (determined by dividing
the mortgage interest rate by 360) which is applied to the principal amount of
the loan so prepaid. When such a prepayment is made during the period from the
sixteenth day through the last day of any month (and from the Cut-off Date
through the fifteenth day of the month of the Cut-off Date), such Prepayment
Interest is passed through to the certificateholders in the month following its
receipt and the amount of interest thus distributed to certificateholders, to
the extent not supplemented by a Compensating Interest Payment (as defined
herein), will be less than the amount which would have been distributed in the
absence of such prepayment. The payment of a claim under certain insurance
policies or the purchase of a defaulted mortgage loan by a private mortgage
insurer may also cause a reduction in the amount of interest passed through.
Shortfalls described in this paragraph will be borne by
 
                                      S-44
<PAGE>   45
 
certificateholders to the extent described herein. See "Description of the
Certificates -- Distributions on the Certificates -- Interest" herein.
 
     Any partial prepayment will be applied to the balance of the related
mortgage loan as of the first day of the month of receipt, will be passed
through to the certificateholders in the following month and, to the extent not
supplemented by a Compensating Interest Payment, will reduce the aggregate
amount of interest distributable to the certificateholders in such month in an
amount equal to 30 days of interest at the related Net Mortgage Rate on the
amount of such prepayment.
 
     The yield on certain classes of the certificates also may be affected by
any repurchase by GECMSI of the mortgage loans as described under "The Pooling
and Servicing Agreement -- Termination" herein.
 
SENSITIVITY OF THE LIBOR CERTIFICATES
 
     The yield to investors in the LIBOR Certificates will be highly sensitive
to the level of LIBOR. Investors in the Class A3 Certificates should consider
(1) the risk that lower than anticipated levels of LIBOR could result in actual
yields that are lower than anticipated yields on such certificates and (2) the
fact that the interest rate on the Class A3 Certificates cannot exceed 9.00%
(which would occur whenever LIBOR equals or exceeds 8.25% for any relevant
Interest Accrual Period other than the first such period). Conversely, investors
in the Class A4 Certificates should consider (1) the risk that higher than
anticipated levels of LIBOR could result in actual yields that are lower than
anticipated yields on such certificates and (2) the fact that the rate of
interest on the Class A4 Certificates can fall as low as 0.0% (which will occur
whenever LIBOR equals or exceeds 8.25% for any relevant Interest Accural Period
other than the first such period).
 
     Levels of LIBOR may have little or no correlation to levels of prevailing
mortgage interest rates. It is possible that lower prevailing mortgage interest
rates, which might be expected to result in faster prepayments, could occur
concurrently with an increased level of LIBOR. Conversely, higher prevailing
mortgage interest rates, which might be expected to result in slower
prepayments, could occur concurrently with a decreased level of LIBOR. In
addition, the timing of changes in the level of LIBOR may affect the actual
yield to maturity to an investor in the LIBOR Certificates even if the average
level is consistent with such investor's expectation. In general, the earlier a
change in the level of LIBOR, the greater the effect on such investor's yield to
maturity. As a result, the effect on such investor's yield to maturity of a
level of LIBOR that is higher (or lower) than the rate anticipated by such
investor during the period immediately following the issuance of the
certificates is not likely to be offset by a subsequent like reduction (or
increase) in the level of LIBOR.
 
     To illustrate the significance of prepayments and changes in LIBOR on the
distributions on the Class A4 Certificates, the following table indicates the
pre-tax yields to maturity (on a corporate bond-equivalent basis) under the
specified assumptions at the different constant percentages of the Prepayment
Assumption (as defined herein) and the different levels of LIBOR indicated. The
yields were calculated by determining the applicable monthly discount rate
which, when applied to the related assumed stream of cash flows to be paid on
the Class A4 Certificates, would cause the discounted present value of such cash
flows to equal the assumed purchase price for such certificates stated in such
table and converting the applicable monthly discount rate to a corporate bond-
equivalent rate. Implicit in the use of any discounted present value or internal
rate of return calculations such as these is the assumption that intermediate
cash flows are
                                      S-45
<PAGE>   46
 
reinvested at the discount rate or internal rate of return. Thus, these
calculations do not take into account the different interest rates at which
investors may be able to reinvest funds received by them as distributions on the
Class A4 Certificates, and, consequently, do not reflect the return on any
investment when such reinvestment rates are considered. It is unlikely that the
mortgage loans will prepay at a constant level of the Prepayment Assumption
until maturity, that all of the mortgage loans will prepay at the same rate or
that LIBOR will not vary. The timing of changes in the rate of prepayments may
significantly affect the total distributions received, the date of receipt of
such distributions and the actual yield to maturity to any investor, even if the
average rate of principal prepayments is consistent with an investor's
expectation. In general, the earlier the payment of principal of the mortgage
loans, the greater the effect on an investor's yield to maturity. As a result,
the effect on an investor's yield of principal prepayments occurring at a rate
higher (or lower) than the rate anticipated by the investor during the period
immediately following the issuance of the certificates will not be equally
offset by a subsequent like reduction (or increase) in the rate of principal
prepayments. Moreover, as noted above, the timing of changes in the level of
LIBOR may affect the actual yield to maturity to an investor in a Class A4
Certificate.
 
     The following table has been prepared based on the Modeling Assumptions and
the additional assumptions that:
 
     - the assumed purchase price of a Class A4 Certificate is the product of
       the assumed purchase price percentage specified below and the initial
       Class Certificate Principal Balance thereof;
 
     - on the LIBOR Determination Date occurring in April 1999 and on each LIBOR
       Determination Date thereafter, LIBOR is the level specified; and
 
     - such purchase price is paid on March 25, 1999.
 
               PRE-TAX YIELD* TO MATURITY OF THE CLASS A4 CERTIFICATES
                      (ASSUMED PURCHASE PRICE PERCENTAGE = 100%)
 
<TABLE>
<CAPTION>
                                                   PREPAYMENT ASSUMPTION
                                       ----------------------------------------------
LEVELS OF LIBOR                          0%      100 %     275 %     400 %     500 %
- ---------------                        ------    ------    ------    ------    ------
<S>                                    <C>       <C>       <C>       <C>       <C>
2.95%................................  13.473%   13.472%   13.464%   13.448%   13.427%
3.95%................................  10.897%   10.897%   10.892%   10.884%   10.873%
4.95%................................   8.338%    8.338%    8.338%    8.338%    8.338%
5.95%................................   5.796%    5.797%    5.802%    5.811%    5.823%
6.95%................................   3.273%    3.274%    3.286%    3.304%    3.327%
8.25% and above......................   0.024%    0.026%    0.044%    0.074%    0.113%
</TABLE>
 
- ---------------
* Corporate bond equivalent basis
 
     The mortgage loans may not have all of the characteristics assumed and
there can be no assurance:
 
     - that the mortgage loans will prepay at any of the constant rates shown in
       the tables or at any particular rate;
 
     - that the pre-tax yields to maturity on the Class A4 Certificates will
       correspond to any of the amounts shown herein;
 
                                      S-46
<PAGE>   47
 
     - that the levels of LIBOR will correspond to the levels shown herein; or
 
     - that the purchase price of a Class A4 Certificate will be as assumed.
 
     The table does not constitute a representation as to the correlation of any
level of LIBOR and the rate of prepayments on the mortgage loans. Each investor
must make its own decision as to the appropriate prepayment assumptions to be
used and the appropriate levels of LIBOR to be assumed in deciding whether or
not to purchase a Class A4 Certificate.
 
     Because the Interest Accrual Period for the LIBOR Certificates will run
from the 25th day of the month preceding the month in which a Distribution Date
occurs to the 24th day of the month of such Distribution Date, the effective
yield on such certificates will not be reduced as a result of any delay between
the end of the Interest Accrual Period and the distribution of interest
(assuming such Distribution Date occurs on the 25th day of the month).
 
THE CLASS M, CLASS B1 AND CLASS B2 CERTIFICATES
 
     The rate of payment of principal, the aggregate amount of distributions and
the yield to maturity of the Class M, Class B1 and Class B2 Certificates will be
affected by the rate of prepayments on the mortgage loans, as well as the rate
of mortgagor defaults resulting in Realized Losses, by the severity of those
losses and by the timing thereof. See "Description of the
Certificates -- Allocation of Realized Losses on the Certificates" herein for a
description of the manner in which such losses are borne by the holders of the
certificates. If the purchaser of a Class M, Class B1 or Class B2 Certificate
calculates its anticipated yield based on an assumed rate of default and amount
of Realized Losses that is lower than the default rate and the amount of losses
actually incurred, its actual yield to maturity may be lower than that so
calculated and could be negative. The timing of defaults and losses will also
affect an investor's actual yield to maturity, even if the average rate of
defaults and severity of losses are consistent with an investor's expectations.
In general, the earlier a loss occurs, the greater the effect on an investor's
yield to maturity.
 
     The yields to maturity on the classes of Class B Certificates with higher
numerical designations will be more sensitive to losses due to liquidations of
defaulted mortgage loans than will the yields on such classes with lower
numerical designations, and the yields to maturity on all of the Class B
Certificates will be more sensitive to such losses than will the yields on the
other classes of certificates. The yields to maturity on the Class M
Certificates will be more sensitive to such losses than will the yields on the
senior certificates and less sensitive than the yields on the Class B
Certificates. The junior certificates will be more sensitive to losses due to
liquidations of defaulted mortgage loans because the entire amount of such
losses will be allocable to such certificates in inverse order of priority,
either directly or through the allocation of the Class PO Deferred Payment
Writedown Amount, except as provided herein. To the extent not covered by
 
                                      S-47
<PAGE>   48
 
GECMSI's advances of delinquent monthly payments of principal and interest,
delinquencies on the mortgage loans may also have a relatively greater effect:
 
     - on the yields to investors in the Class B Certificates with higher
       numerical designations than on the yields to investors in those Class B
       Certificates with lower numerical designations;
 
     - on the yields to investors in the Class B Certificates than on the yields
       to investors in the other classes of the certificates; and
 
     - on the yields to investors in the Class M Certificates than on the yields
       to investors in the senior certificates.
 
     As described above under "Description of the Certificates -- Distributions
on the Certificates -- Interest" and "-- Principal," "-- Allocation of Realized
Losses on the Certificates" and "-- Subordination," amounts otherwise
distributable to holders of any class of Class B Certificates will be made
available to protect the holders of the more senior ranking classes of the
certificates against interruptions in distributions due to certain mortgagor
delinquencies. Amounts otherwise distributable to holders of the Class M
Certificates will be made available to protect the holders of the senior
certificates against interruptions in distributions due to certain mortgagor
delinquencies. Such delinquencies, even if subsequently cured, may affect the
timing of the receipt of distributions by the holders of the junior
certificates.
 
     To the extent that the Class M, Class B1 or Class B2 Certificates are being
purchased at discounts from their initial Class Certificate Principal Balances,
if the purchaser of such a certificate calculates its yield to maturity based on
an assumed rate of payment of principal faster than that actually received on
such certificate, its actual yield to maturity may be lower than that so
calculated.
 
FINAL PAYMENT CONSIDERATIONS
 
     The rate of payment of principal of the certificates will depend on the
rate of payment of principal of the mortgage loans (including prepayments,
defaults, delinquencies and liquidations) which, in turn, will depend on the
characteristics of the mortgage loans, the level of prevailing interest rates
and other economic, geographic, social and other factors, and no assurance can
be given as to the actual payment experience. As of the Cut-off Date, the month
and year of the latest scheduled maturity of a mortgage loan is expected to be
February 2029. In addition, to the extent delinquencies and defaults are not
covered by advances made by GECMSI or offset by the effect of the subordination
of the junior certificates, delinquencies and defaults could affect the actual
maturity of the certificates offered hereby.
 
WEIGHTED AVERAGE LIVES OF THE CERTIFICATES
 
     The weighted average life of a certificate is determined by:
 
     - multiplying the reduction, if any, in the principal balance thereof on
       each Distribution Date by the number of years from the date of issuance
       to such Distribution Date;
 
     - summing the results; and
 
     - dividing the sum by the aggregate reductions in the principal balance of
       such certificate.
 
                                      S-48
<PAGE>   49
 
     The weighted average lives of the certificates will be affected, to varying
degrees, by the rate of principal payments on the mortgage loans, the timing of
changes in such rate of payments and the priority sequence of distributions of
principal of such certificates. The interaction of the foregoing factors may
have different effects on the various classes of the certificates and the
effects on any class may vary at different times during the life of such class.
Further, to the extent the prices of a class of certificates represent discounts
or premiums to their respective original principal balances, variability in the
weighted average lives of such classes of certificates could result in
variability in the related yields to maturity.
 
     Prepayments on mortgage loans are commonly measured relative to a
prepayment standard or model. The model used in this prospectus supplement (the
"Prepayment Assumption") represents an assumed rate of prepayment each month
relative to the then outstanding principal balance of a pool of mortgage loans.
The Prepayment Assumption does not purport to be either a historical description
of the prepayment experience of any pool of mortgage loans or a prediction of
the anticipated rate of prepayment of any pool of mortgage loans, including the
mortgage loans in the mortgage pool. A prepayment assumption of 100% of the
Prepayment Assumption assumes 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 increasing by 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% of the
Prepayment Assumption assumes a constant prepayment rate of 6.0% per annum.
 
Tables of Certificate Principal Balances
 
     The following tables set forth the percentages of the initial Class
Certificate Principal Balance of each class of certificates offered hereby that
would be outstanding after each of the dates shown at the specified constant
percentages of the Prepayment Assumption and the corresponding weighted average
life of each such class of certificates. For purposes of calculations under the
columns at the indicated percentages of the Prepayment Assumption set forth in
the table, it is assumed with respect to the mortgage loans (the "Modeling
Assumptions") that:
 
      (1) the distributions in respect of the certificates are made and received
          in cash on the 25th day of each month commencing in April 1999;
 
      (2) such mortgage loans prepay at the specified constant percentages of
          the Prepayment Assumption;
 
      (3) the aggregate outstanding Scheduled Principal Balance of such mortgage
          loans as of the Cut-off Date is $500,082,530.94;
 
      (4) no defaults or delinquencies in the payment by mortgagors of principal
          of and interest on such mortgage loans are experienced and GECMSI does
          not repurchase any such mortgage loans as permitted or required by the
          Agreement;
 
      (5) GECMSI does not exercise its option to repurchase all the mortgage
          loans in the trust as described under the caption "The Pooling and
          Servicing Agreement -- Termination" herein;
 
      (6) scheduled monthly payments on such mortgage loans are received on the
          first day of each month commencing in April 1999, and are computed
          prior to giving effect to prepayments received in the prior month;
 
                                      S-49
<PAGE>   50
 
      (7) prepayments representing payment in full of individual mortgage loans
          are received on the last day of each month commencing in March 1999,
          and include 30 days' interest thereon, and no Interest Shortfalls
          occur in respect of the mortgage loans;
 
      (8) the scheduled monthly payment for each such mortgage loan has been
          calculated based on its outstanding balance, interest rate and
          remaining term to maturity such that such mortgage loan will amortize
          in amounts sufficient to repay the remaining balance of such mortgage
          loan by its remaining term to maturity;
 
      (9) the initial Class Certificate Principal Balance and interest rate on
          the certificates for each class of certificates offered hereby are as
          indicated on page S-3 hereof, except that LIBOR is assumed to remain
          constant at 4.95%;
 
     (10) the date of the initial issuance of the certificates is March 25,
          1999;
 
     (11) the amount distributable to certificateholders is not reduced by the
          incurrence of any expenses by the trust; and
 
     (12) the mortgage loans are divided into groups (each a "Mortgage Loan
          Group") and the mortgage loans in each Mortgage Loan Group have the
          respective characteristics described below:
 
<TABLE>
<CAPTION>
                           AGGREGATE                                                       STATED
                           SCHEDULED                                                      REMAINING
      MORTGAGE             PRINCIPAL          MORTGAGE            NET                      TERM TO
        LOAN           BALANCE AS OF THE      INTEREST         MORTGAGE         AGE       MATURITY
        GROUP            CUT-OFF DATE           RATE             RATE         (MONTHS)    (MONTHS)
- ---------------------  -----------------    -------------    -------------    --------    ---------
<S>                    <C>                  <C>              <C>              <C>         <C>
Discount.............    $26,154,841.10       6.528676735%     6.324239032%      3          357
Non-discount.........   473,927,689.84        7.205548230      6.953457001       3          356
</TABLE>
 
     It is not likely that the mortgage loans will prepay at a constant level of
the Prepayment Assumption. In addition, because certain of such mortgage loans
will have remaining terms to maturity and will bear interest at rates that are
different from those assumed, the actual Class Certificate Principal Balance of
each class of certificates outstanding at any time and the actual weighted
average life of each class of such certificates may differ from the
corresponding information in the table for each indicated percentage of the
Prepayment Assumption. Furthermore, even if all the mortgage loans prepay at the
indicated percentages of the Prepayment Assumption and the weighted average
mortgage interest rate and weighted average remaining term to maturity of such
mortgage loans were to equal the weighted average mortgage interest rate and
weighted average remaining term to maturity of the assumed mortgage loans, due
to the actual distribution of remaining terms to maturity and interest rates
among the mortgage loans, the actual principal balance of each class of
certificates outstanding at any time and the actual weighted average life of
each class of such certificates would differ (which difference could be
material) from the corresponding information set forth in the following tables.
 
                                      S-50
<PAGE>   51
 
            PERCENT OF ORIGINAL CLASS CERTIFICATE PRINCIPAL BALANCE
                        OUTSTANDING OF THE CERTIFICATES
 
<TABLE>
<CAPTION>
                                        CLASS A1                          CLASS A2                    CLASS A3 AND CLASS A4
                             -------------------------------   -------------------------------   --------------------------------
DISTRIBUTION DATE            0%    100%   275%   400%   500%   0%    100%   275%   400%   500%    0%    100%   275%   400%   500%
- -----------------            ---   ----   ----   ----   ----   ---   ----   ----   ----   ----   ----   ----   ----   ----   ----
<S>                          <C>   <C>    <C>    <C>    <C>    <C>   <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>
Initial Percentage.........  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2000.................   99    96     91     88     85    100   100    100    100    100     100   100    100    100    100
March 2001.................   97    88     74     64     56    100   100    100    100    100     100   100    100    100    100
March 2002.................   95    79     53     37     25    100   100    100    100    100     100   100    100    100    100
March 2003.................   94    70     36     17      4    100   100    100    100    100     100   100    100    100    100
March 2004.................   92    62     22      1      0    100   100    100    100     14     100   100    100    100    100
March 2005.................   90    54     11      0      0    100   100    100     36      0     100   100    100    100     47
March 2006.................   88    48      3      0      0    100   100    100      0      0     100   100    100     85      8
March 2007.................   86    42      0      0      0    100   100     77      0      0     100   100    100     52      0
March 2008.................   83    36      0      0      0    100   100     44      0      0     100   100    100     34      0
March 2009.................   81    31      0      0      0    100   100     20      0      0     100   100    100     25      0
March 2010.................   79    27      0      0      0    100   100      0      0      0     100   100    100     19      0
March 2011.................   76    22      0      0      0    100   100      0      0      0     100   100     81     14      0
March 2012.................   73    18      0      0      0    100   100      0      0      0     100   100     66     10      0
March 2013.................   70    14      0      0      0    100   100      0      0      0     100   100     53      8      0
March 2014.................   66    11      0      0      0    100   100      0      0      0     100   100     43      6      0
March 2015.................   63     7      0      0      0    100   100      0      0      0     100   100     34      4      0
March 2016.................   59     4      0      0      0    100   100      0      0      0     100   100     27      3      0
March 2017.................   55     1      0      0      0    100   100      0      0      0     100   100     22      2      0
March 2018.................   50     0      0      0      0    100    85      0      0      0     100   100     17      2      0
March 2019.................   45     0      0      0      0    100    64      0      0      0     100   100     13      1      0
March 2020.................   40     0      0      0      0    100    44      0      0      0     100   100     10      1      0
March 2021.................   34     0      0      0      0    100    26      0      0      0     100   100      8      1      0
March 2022.................   28     0      0      0      0    100     9      0      0      0     100   100      6      0      0
March 2023.................   22     0      0      0      0    100     0      0      0      0     100    91      4      0      0
March 2024.................   15     0      0      0      0    100     0      0      0      0     100    73      3      0      0
March 2025.................    8     0      0      0      0    100     0      0      0      0     100    56      2      0      0
March 2026.................    0     0      0      0      0     98     0      0      0      0     100    39      1      0      0
March 2027.................    0     0      0      0      0     33     0      0      0      0     100    24      1      0      0
March 2028.................    0     0      0      0      0      0     0      0      0      0      57     9      0      0      0
March 2029.................    0     0      0      0      0      0     0      0      0      0       0     0      0      0      0
Weighted Average Life (in
  years)(1)................  17.4  7.6    3.4    2.6    2.2    27.8  20.8   9.0    5.9    4.7    29.1   26.5   15.5   9.2    6.1
</TABLE>
 
- -------------------------
(1) The weighted average life is determined as described on page S-48 of this
    prospectus supplement.
 
                                      S-51
<PAGE>   52
 
            PERCENT OF ORIGINAL CLASS CERTIFICATE PRINCIPAL BALANCE
                        OUTSTANDING OF THE CERTIFICATES
 
<TABLE>
<CAPTION>
                                        CLASS A5                          CLASS A6                           CLASS A7
                             -------------------------------   -------------------------------   --------------------------------
DISTRIBUTION DATE            0%    100%   275%   400%   500%   0%    100%   275%   400%   500%    0%    100%   275%   400%   500%
- -----------------            ---   ----   ----   ----   ----   ---   ----   ----   ----   ----   ----   ----   ----   ----   ----
<S>                          <C>   <C>    <C>    <C>    <C>    <C>   <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>
Initial Percentage.........  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
    March 2000.............  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
    March 2001.............  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
    March 2002.............  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
    March 2003.............  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
    March 2004.............  100   100    100    100    100    100   100    100    100      0     100   100    100    100      0
    March 2005.............  100    98     94     91     88    100   100    100      0      0     100   100    100      0      0
    March 2006.............   99    95     86     80     74    100   100    100      0      0     100   100    100      0      0
    March 2007.............   98    90     76     66     52    100   100     23      0      0     100   100    100      0      0
    March 2008.............   96    84     65     52     35    100   100      0      0      0     100   100     12      0      0
    March 2009.............   94    77     53     39     24    100   100      0      0      0     100   100      0      0      0
    March 2010.............   92    71     43     29     16    100   100      0      0      0     100   100      0      0      0
    March 2011.............   89    65     35     21     11    100   100      0      0      0     100   100      0      0      0
    March 2012.............   87    59     28     16      8    100   100      0      0      0     100   100      0      0      0
    March 2013.............   84    54     23     11      5    100   100      0      0      0     100   100      0      0      0
    March 2014.............   81    49     18      8      3    100   100      0      0      0     100   100      0      0      0
    March 2015.............   78    44     15      6      2    100   100      0      0      0     100   100      0      0      0
    March 2016.............   74    40     12      4      2    100   100      0      0      0     100   100      0      0      0
    March 2017.............   71    35      9      3      1    100   100      0      0      0     100   100      0      0      0
    March 2018.............   67    31      7      2      1    100    49      0      0      0     100   100      0      0      0
    March 2019.............   62    28      6      2      0    100     0      0      0      0     100    80      0      0      0
    March 2020.............   58    24      4      1      0    100     0      0      0      0     100    15      0      0      0
    March 2021.............   53    21      3      1      0    100     0      0      0      0     100     0      0      0      0
    March 2022.............   47    17      3      1      0    100     0      0      0      0     100     0      0      0      0
    March 2023.............   42    14      2      0      0    100     0      0      0      0     100     0      0      0      0
    March 2024.............   35    12      1      0      0    100     0      0      0      0     100     0      0      0      0
    March 2025.............   29     9      1      0      0    100     0      0      0      0     100     0      0      0      0
    March 2026.............   22     6      1      0      0     93     0      0      0      0     100     0      0      0      0
    March 2027.............   14     4      0      0      0      0     0      0      0      0       0     0      0      0      0
    March 2028.............    6     1      0      0      0      0     0      0      0      0       0     0      0      0      0
    March 2029.............    0     0      0      0      0      0     0      0      0      0       0     0      0      0      0
Weighted Average Life
  (in years)(1)............  21.3  15.8   11.4   9.9    8.8    27.2  19.0   7.9    5.3    4.4    27.7   20.5   8.7    5.8    4.6
</TABLE>
 
- -------------------------
(1) The weighted average life is determined as described on page S-48 of this
    prospectus supplement.
 
                                      S-52
<PAGE>   53
 
            PERCENT OF ORIGINAL CLASS CERTIFICATE PRINCIPAL BALANCE
                        OUTSTANDING OF THE CERTIFICATES
 
<TABLE>
<CAPTION>
                                        CLASS A8                          CLASS A9                          CLASS A10
                             -------------------------------   -------------------------------   --------------------------------
DISTRIBUTION DATE            0%    100%   275%   400%   500%   0%    100%   275%   400%   500%    0%    100%   275%   400%   500%
- -----------------            ---   ----   ----   ----   ----   ---   ----   ----   ----   ----   ----   ----   ----   ----   ----
<S>                          <C>   <C>    <C>    <C>    <C>    <C>   <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>
Initial Percentage.........  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2000.................  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2001.................  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2002.................  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2003.................  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2004.................  100   100    100    100      0    100   100    100    100     72     100   100    100    100    100
March 2005.................  100   100    100     81      0    100   100    100    100      0     100   100    100    100      0
March 2006.................  100   100    100      0      0    100   100    100      0      0     100   100    100     39      0
March 2007.................  100   100    100      0      0    100   100    100      0      0     100   100    100      0      0
March 2008.................  100   100    100      0      0    100   100    100      0      0     100   100    100      0      0
March 2009.................  100   100      0      0      0    100   100     99      0      0     100   100    100      0      0
March 2010.................  100   100      0      0      0    100   100      1      0      0     100   100    100      0      0
March 2011.................  100   100      0      0      0    100   100      0      0      0     100   100     26      0      0
March 2012.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2013.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2014.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2015.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2016.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2017.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2018.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2019.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2020.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2021.................  100    30      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2022.................  100     0      0      0      0    100    43      0      0      0     100   100      0      0      0
March 2023.................  100     0      0      0      0    100     0      0      0      0     100    63      0      0      0
March 2024.................  100     0      0      0      0    100     0      0      0      0     100     0      0      0      0
March 2025.................  100     0      0      0      0    100     0      0      0      0     100     0      0      0      0
March 2026.................  100     0      0      0      0    100     0      0      0      0     100     0      0      0      0
March 2027.................   64     0      0      0      0    100     0      0      0      0     100     0      0      0      0
March 2028.................    0     0      0      0      0      0     0      0      0      0       0     0      0      0      0
March 2029.................    0     0      0      0      0      0     0      0      0      0       0     0      0      0      0
Weighted Average Life (in
  years)(1)................  28.1  21.8   9.6    6.2    4.9    28.4  23.0   10.5   6.5    5.1    28.7   24.2   11.7   7.0    5.4
</TABLE>
 
- -------------------------
(1) The weighted average life is determined as described on page S-48 of this
    prospectus supplement.
 
                                      S-53
<PAGE>   54
 
            PERCENT OF ORIGINAL CLASS CERTIFICATE PRINCIPAL BALANCE
                        OUTSTANDING OF THE CERTIFICATES
 
<TABLE>
<CAPTION>
                                        CLASS A11                         CLASS A12                         CLASS A13
                             -------------------------------   -------------------------------   --------------------------------
DISTRIBUTION DATE            0%    100%   275%   400%   500%   0%    100%   275%   400%   500%    0%    100%   275%   400%   500%
- -----------------            ---   ----   ----   ----   ----   ---   ----   ----   ----   ----   ----   ----   ----   ----   ----
<S>                          <C>   <C>    <C>    <C>    <C>    <C>   <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>
Initial Percentage.........  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2000.................  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2001.................  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2002.................  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2003.................  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2004.................  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2005.................  100   100    100    100      0    100   100    100    100     59     100   100    100    100    100
March 2006.................  100   100    100    100      0    100   100    100    100      0     100   100    100    100      0
March 2007.................  100   100    100      0      0    100   100    100     83      0     100   100    100    100      0
March 2008.................  100   100    100      0      0    100   100    100      0      0     100   100    100     95      0
March 2009.................  100   100    100      0      0    100   100    100      0      0     100   100    100     51      0
March 2010.................  100   100    100      0      0    100   100    100      0      0     100   100    100     18      0
March 2011.................  100   100    100      0      0    100   100    100      0      0     100   100    100      0      0
March 2012.................  100   100     55      0      0    100   100    100      0      0     100   100    100      0      0
March 2013.................  100   100      0      0      0    100   100     92      0      0     100   100    100      0      0
March 2014.................  100   100      0      0      0    100   100     40      0      0     100   100    100      0      0
March 2015.................  100   100      0      0      0    100   100      0      0      0     100   100     97      0      0
March 2016.................  100   100      0      0      0    100   100      0      0      0     100   100     62      0      0
March 2017.................  100   100      0      0      0    100   100      0      0      0     100   100     34      0      0
March 2018.................  100   100      0      0      0    100   100      0      0      0     100   100     11      0      0
March 2019.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2020.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2021.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2022.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2023.................  100   100      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2024.................  100    88      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2025.................  100     3      0      0      0    100   100      0      0      0     100   100      0      0      0
March 2026.................  100     0      0      0      0    100    21      0      0      0     100   100      0      0      0
March 2027.................  100     0      0      0      0    100     0      0      0      0     100    45      0      0      0
March 2028.................   12     0      0      0      0    100     0      0      0      0     100     0      0      0      0
March 2029.................    0     0      0      0      0      0     0      0      0      0       0     0      0      0      0
Weighted Average Life
  (in years) (1)...........  28.9  25.5   13.1   7.6    5.7    29.2  26.7   14.9   8.4    6.1    29.4   28.0   17.6   10.2   6.5
</TABLE>
 
- -------------------------
(1) The weighted average life is determined as described on page S-48 of this
    prospectus supplement.
 
                                      S-54
<PAGE>   55
 
            PERCENT OF ORIGINAL CLASS CERTIFICATE PRINCIPAL BALANCE
                        OUTSTANDING OF THE CERTIFICATES
 
<TABLE>
<CAPTION>
                                        CLASS A14                         CLASS A15                         CLASS A16
                             -------------------------------   -------------------------------   --------------------------------
DISTRIBUTION DATE            0%    100%   275%   400%   500%   0%    100%   275%   400%   500%    0%    100%   275%   400%   500%
- -----------------            ---   ----   ----   ----   ----   ---   ----   ----   ----   ----   ----   ----   ----   ----   ----
<S>                          <C>   <C>    <C>    <C>    <C>    <C>   <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>
Initial Percentage.........  100   100    100    100    100    100   100    100    100    100     100   100    100    100    100
March 2000.................  100   100    100    100    100     99    97     93     90     88      99    96     92     89     86
March 2001.................  100   100    100    100    100     98    91     78     70     64      97    89     76     67     60
March 2002.................  100   100    100    100    100     96    83     62     48     39      96    81     57     43     32
March 2003.................  100   100    100    100    100     95    76     48     32     21      94    73     42     24     12
March 2004.................  100   100    100    100    100     93    69     36     19      3      93    65     29     10      1
March 2005.................  100   100    100    100    100     92    63     27      7      0      91    59     19      3      0
March 2006.................  100   100    100    100     54     90    57     21      0      0      89    52     12      0      0
March 2007.................  100   100    100    100      0     88    52     14      0      0      87    47      7      0      0
March 2008.................  100   100    100    100      0     86    48      8      0      0      85    42      4      0      0
March 2009.................  100   100    100    100      0     85    44      4      0      0      83    37      2      0      0
March 2010.................  100   100    100    100      0     82    40      0      0      0      80    33      0      0      0
March 2011.................  100   100    100     92      0     80    36      0      0      0      78    29      0      0      0
March 2012.................  100   100    100     68      0     78    33      0      0      0      75    26      0      0      0
March 2013.................  100   100    100     50      0     75    30      0      0      0      72    22      0      0      0
March 2014.................  100   100    100     37      0     72    27      0      0      0      69    19      0      0      0
March 2015.................  100   100    100     27      0     69    24      0      0      0      66    16      0      0      0
March 2016.................  100   100    100     19      0     66    21      0      0      0      63    13      0      0      0
March 2017.................  100   100    100     14      0     63    19      0      0      0      59    10      0      0      0
March 2018.................  100   100    100     10      0     59    15      0      0      0      55     8      0      0      0
March 2019.................  100   100     89      7      0     55    12      0      0      0      50     6      0      0      0
March 2020.................  100   100     69      5      0     51     8      0      0      0      46     4      0      0      0
March 2021.................  100   100     53      3      0     46     5      0      0      0      40     2      0      0      0
March 2022.................  100   100     39      2      0     41     2      0      0      0      35     1      0      0      0
March 2023.................  100   100     29      2      0     36     0      0      0      0      29     0      0      0      0
March 2024.................  100   100     21      1      0     31     0      0      0      0      23     0      0      0      0
March 2025.................  100   100     14      1      0     24     0      0      0      0      16     0      0      0      0
March 2026.................  100   100      9      0      0     18     0      0      0      0       9     0      0      0      0
March 2027.................  100   100      5      0      0      6     0      0      0      0       3     0      0      0      0
March 2028.................  100    62      2      0      0      0     0      0      0      0       0     0      0      0      0
March 2029.................    0     0      0      0      0      0     0      0      0      0       0     0      0      0      0
Weighted Average Life
  (in years) (1)...........  29.6  29.2   22.8   14.9   7.1    19.3  10.0   4.4    3.2    2.7    18.4   8.8    3.9    2.9    2.5
</TABLE>
 
- -------------------------
(1) The weighted average life is determined as described on page S-48 of this
    prospectus supplement.
 
                                      S-55
<PAGE>   56
 
            PERCENT OF ORIGINAL CLASS CERTIFICATE PRINCIPAL BALANCE
                        OUTSTANDING OF THE CERTIFICATES
 
<TABLE>
<CAPTION>
                                       CLASS A17                         CLASS A18                     CLASSES M, B1 AND B2
                            -------------------------------   --------------------------------   --------------------------------
DISTRIBUTION DATE           0%    100%   275%   400%   500%    0%    100%   275%   400%   500%    0%    100%   275%   400%   500%
- -----------------           ---   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----   ----
<S>                         <C>   <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>    <C>
Initial Percentage........  100   100    100    100    100     100   100    100    100    100     100   100    100    100    100
March 2000................   96    87     73     62     54     100   100    100    100    100      99    99     99     99     99
March 2001................   91    64     19      0      0     100   100    100     94     83      98    98     98     98     98
March 2002................   86    36      0      0      0     100   100     79     55     37      97    97     97     97     97
March 2003................   81     9      0      0      0     100   100     54     25      5      95    95     95     95     95
March 2004................   75     0      0      0      0     100    92     32      2      0      94    94     94     94     94
March 2005................   69     0      0      0      0     100    81     17      0      0      93    91     88     85     83
March 2006................   63     0      0      0      0     100    71      4      0      0      91    87     80     75     71
March 2007................   56     0      0      0      0     100    62      0      0      0      89    83     71     63     56
March 2008................   49     0      0      0      0     100    54      0      0      0      88    77     60     49     42
March 2009................   42     0      0      0      0     100    46      0      0      0      86    71     49     37     29
March 2010................   34     0      0      0      0     100    39      0      0      0      84    65     40     27     19
March 2011................   26     0      0      0      0     100    33      0      0      0      81    59     33     20     13
March 2012................   17     0      0      0      0     100    27      0      0      0      79    54     26     15      9
March 2013................    7     0      0      0      0     100    21      0      0      0      77    49     21     11      6
March 2014................    0     0      0      0      0      98    16      0      0      0      74    45     17      8      4
March 2015................    0     0      0      0      0      93    11      0      0      0      71    40     14      6      3
March 2016................    0     0      0      0      0      87     6      0      0      0      68    36     11      4      2
March 2017................    0     0      0      0      0      81     1      0      0      0      64    32      9      3      1
March 2018................    0     0      0      0      0      74     0      0      0      0      61    29      7      2      1
March 2019................    0     0      0      0      0      67     0      0      0      0      57    25      5      2      1
March 2020................    0     0      0      0      0      59     0      0      0      0      52    22      4      1      0
March 2021................    0     0      0      0      0      51     0      0      0      0      48    19      3      1      0
March 2022................    0     0      0      0      0      42     0      0      0      0      43    16      2      1      0
March 2023................    0     0      0      0      0      33     0      0      0      0      38    13      2      0      0
March 2024................    0     0      0      0      0      22     0      0      0      0      32    11      1      0      0
March 2025................    0     0      0      0      0      11     0      0      0      0      26     8      1      0      0
March 2026................    0     0      0      0      0       0     0      0      0      0      20     6      1      0      0
March 2027................    0     0      0      0      0       0     0      0      0      0      13     3      0      0      0
March 2028................    0     0      0      0      0       0     0      0      0      0       5     1      0      0      0
March 2029................    0     0      0      0      0       0     0      0      0      0       0     0      0      0      0
Weighted Average Life (in
  years)(1)...............  8.5   2.5    1.4    1.2    1.0    21.8   10.1   4.4    3.3    2.8    19.8   14.8   10.8   9.5    8.8
</TABLE>
 
- -------------------------
(1) The weighted average life is determined as described on page S-48 of this
    prospectus supplement.
 
                                      S-56
<PAGE>   57
 
            PERCENT OF ORIGINAL CLASS CERTIFICATE PRINCIPAL BALANCE
                        OUTSTANDING OF THE CERTIFICATES
 
<TABLE>
<CAPTION>
                                                                          CLASS R
                                                              -------------------------------
DISTRIBUTION DATE                                             0%    100%   275%   400%   500%
- -----------------                                             ---   ----   ----   ----   ----
<S>                                                           <C>   <C>    <C>    <C>    <C>
Initial Percentage..........................................  100   100    100    100    100
March 2000..................................................    0     0      0      0      0
March 2001..................................................    0     0      0      0      0
March 2002..................................................    0     0      0      0      0
March 2003..................................................    0     0      0      0      0
March 2004..................................................    0     0      0      0      0
March 2005..................................................    0     0      0      0      0
March 2006..................................................    0     0      0      0      0
March 2007..................................................    0     0      0      0      0
March 2008..................................................    0     0      0      0      0
March 2009..................................................    0     0      0      0      0
March 2010..................................................    0     0      0      0      0
March 2011..................................................    0     0      0      0      0
March 2012..................................................    0     0      0      0      0
March 2013..................................................    0     0      0      0      0
March 2014..................................................    0     0      0      0      0
March 2015..................................................    0     0      0      0      0
March 2016..................................................    0     0      0      0      0
March 2017..................................................    0     0      0      0      0
March 2018..................................................    0     0      0      0      0
March 2019..................................................    0     0      0      0      0
March 2020..................................................    0     0      0      0      0
March 2021..................................................    0     0      0      0      0
March 2022..................................................    0     0      0      0      0
March 2023..................................................    0     0      0      0      0
March 2024..................................................    0     0      0      0      0
March 2025..................................................    0     0      0      0      0
March 2026..................................................    0     0      0      0      0
March 2027..................................................    0     0      0      0      0
March 2028..................................................    0     0      0      0      0
March 2029..................................................    0     0      0      0      0
Weighted Average Life (in years)(1).........................  0.1   0.1    0.1    0.1    0.1
</TABLE>
 
- -------------------------
(1) The weighted average life is determined as described on page S-48 of this
    prospectus supplement.
 
                                      S-57
<PAGE>   58
 
GE CAPITAL MORTGAGE SERVICES, INC.
 
     GECMSI, a wholly-owned subsidiary of GE Capital Mortgage Corporation, is a
New Jersey corporation originally incorporated in 1949. The principal executive
office of GECMSI is located at Three Executive Campus, Cherry Hill, New Jersey
08002, telephone (609) 661-6100. For a general description of GECMSI and its
activities, see "GE Capital Mortgage Services, Inc." in the accompanying
prospectus.
 
     GECMSI currently maintains an electronic bulletin board, accessible by
computer modem, which provides certain information about loans included in
various series of mortgage pass-through securities that GECMSI has publicly
offered. GECMSI makes no representation or warranty that such information will
be suitable for any particular purpose and GECMSI assumes no responsibility for
the accuracy or completeness of any information that is generated by others
using such information. GECMSI has no obligation to maintain the bulletin board
and may stop maintaining it at any time. For further information concerning the
bulletin board, you should call 800-544-3466, extension 5515.
 
DELINQUENCY AND FORECLOSURE EXPERIENCE OF GECMSI
 
     The following delinquency tables set forth certain information concerning
the delinquency and foreclosure experience on one- to four-family conventional
residential mortgage loans serviced directly by GECMSI, excluding Home Equity
Loans (as defined in the prospectus) and special loan portfolios which, upon
GECMSI's commencement of servicing responsibilities, consisted of significant
numbers of mortgage loans that were seriously delinquent or in foreclosure. The
servicing portfolio does not include mortgage loans that were serviced or
subserviced by others.
 
<TABLE>
<CAPTION>
                             AS OF DECEMBER 31,      AS OF DECEMBER 31,      AS OF DECEMBER 31,
                                    1996                    1997                    1998
                            ---------------------   ---------------------   ---------------------
                            BY NO.     BY DOLLAR    BY NO.     BY DOLLAR    BY NO.     BY DOLLAR
                              OF       AMOUNT OF      OF       AMOUNT OF      OF       AMOUNT OF
                             LOANS       LOANS       LOANS       LOANS       LOANS       LOANS
                            -------   -----------   -------   -----------   -------   -----------
                                                (DOLLAR AMOUNTS IN THOUSANDS)
<S>                         <C>       <C>           <C>       <C>           <C>       <C>
Total portfolio...........  785,928   $88,188,662   726,869   $83,535,531   622,179   $75,039,774
                            =======   ===========   =======   ===========   =======   ===========
Period of delinquency(1)
  30 to 59 days...........    3,362   $   353,209     2,687   $   281,657     2,314   $   242,342
  60 to 89 days...........    1,177       135,668       632        71,245       526        56,889
  90 days or more(2)......    6,867       892,643     5,442       662,342     4,561       512,734
                            -------   -----------   -------   -----------   -------   -----------
Total delinquent loans....   11,406   $ 1,381,520     8,761   $ 1,051,244     7,401   $   811,965
                            =======   ===========   =======   ===========   =======   ===========
Percent of portfolio......     1.45%         1.57%     1.21%         1.22%     1.19%         1.08%
</TABLE>
 
- -------------------------
 
(1) The indicated periods of delinquency are based on the number of days past
    due on a contractual basis, based on a 30-day month. No mortgage loan is
    considered delinquent for these purposes until the monthly anniversary of
    its contractual due date (e.g., a mortgage loan with a payment due on
    January 1 would first be considered delinquent on February 1). The
    delinquencies reported above were determined as of the dates indicated.
 
(2) Includes pending foreclosures.
 
                                      S-58
<PAGE>   59
 
<TABLE>
<CAPTION>
                                           AS OF DECEMBER 31,
                                -----------------------------------------
                                   1996           1997           1998
                                -----------    -----------    -----------
                                      (DOLLAR AMOUNTS IN THOUSANDS)
<S>                             <C>            <C>            <C>
Total portfolio...............  $88,188,662    $83,535,531    $75,039,774
Foreclosures(1)...............      372,800        271,046        189,421
Foreclosure ratio.............         0.42%          0.32%          0.25%
</TABLE>
 
- -------------------------
 
(1) Foreclosures represent the principal balance of mortgage loans secured by
    mortgaged properties, the title to which has been acquired by GECMSI, by
    investors or by an insurer following foreclosure or delivery of a deed in
    lieu of foreclosure and which had not been liquidated at the end of the
    period indicated. The length of time necessary to complete the liquidation
    of such mortgaged properties may be affected by prevailing economic
    conditions and the marketability of the mortgaged properties.
 
     We are not currently aware of specific trends that have affected our recent
delinquency and loss experience, nor are we currently aware of any trends that
are likely to affect the future performance of our servicing portfolio.
 
     The delinquency and foreclosure experience set forth above is historical
and is based on the servicing of mortgage loans that may not be representative
of the mortgage loans in the trust. Consequently, there can be no assurance that
the delinquency and foreclosure experience on the mortgage loans in the trust
will be consistent with the data set forth above. The servicing portfolio, for
example, includes mortgage loans having a wide variety of payment
characteristics (e.g., fixed rate mortgage loans, adjustable rate mortgage loans
and graduated payment mortgage loans) and mortgage loans secured by mortgaged
properties in geographic locations that may not be representative of the
geographic locations of the mortgage loans in the trust. The servicing portfolio
also includes mortgage loans originated in accordance with GECMSI's then
applicable underwriting policies as well as mortgage loans not originated in
accordance with such policies but as to which GECMSI had acquired the related
servicing rights.
 
     The servicing portfolio includes many mortgage loans which have not been
outstanding long enough to have seasoned to a point where delinquencies would be
fully reflected. In the absence of such substantial continuous additions of
servicing for recently originated mortgage loans to the servicing portfolio, it
is possible that the delinquency and foreclosure percentages experienced in the
future could be significantly higher than those indicated in the tables above.
Investors should further note that a number of social, economic, tax,
geographic, demographic, legal and other factors may adversely affect the timely
payment by borrowers of scheduled payments of principal and interest on the
mortgage loans in the servicing portfolio, which could, in turn, cause an
increase in delinquency and foreclosure rates. These factors include economic
conditions, either nationally or in geographic areas where GECMSI's servicing
portfolio tends to be concentrated, the age of the mortgage loans in the trust,
the geographic distribution of the mortgaged properties, the payment terms of
the mortgages, the characteristics of the mortgagors, enforceability of
due-on-sale clauses and servicing decisions.
 
USE OF PROCEEDS
 
     The net proceeds from the sale of the certificates offered hereby will be
general funds used by GECMSI for general corporate purposes, including the
acquisition of residential mortgage loans and servicing rights.
 
                                      S-59
<PAGE>   60
 
THE POOLING AND SERVICING AGREEMENT
 
     The certificates will be issued pursuant to the Agreement. The following
summaries describe the material provisions of the Agreement that are unique to
this offering of certificates. See "The Pooling and Servicing Agreement" in the
accompanying prospectus for summaries of the other material provisions of the
Agreement. The summaries below do not purport to be complete and are subject to,
and qualified in their entirety by reference to, the provisions of the
Agreement. Where particular provisions or terms used in the Agreement are
referred to, those provisions or terms are as specified in the Agreement.
 
SERVICING ARRANGEMENT WITH RESPECT TO THE MORTGAGE LOANS
 
     It is expected that GECMSI will directly service approximately 92% (by
aggregate Scheduled Principal Balance as of the Cut-off Date) of the mortgage
loans and will function as master servicer with respect to the remaining
mortgage loans pursuant to a Direct Master Servicing Arrangement (as defined in
the accompanying prospectus). Such master-serviced loans will be directly
serviced by the entities which originated or acquired those loans and sold them
to GECMSI. The Agreement permits GECMSI to use other primary servicing agents
from time to time. See "Servicing of the Mortgage Loans" in the accompanying
prospectus.
 
COLLECTION ACCOUNT
 
     The Agreement provides that if GECMSI or the Trustee obtains actual notice
or knowledge of the occurrence of a Trigger Event or the downgrade by Standard
and Poor's Ratings Services, a division of The McGraw-Hill Companies, Inc.
("S&P") of GE Capital's short term unsecured rating below A-1+, GECMSI will, in
lieu of the Loan Payment Record described under the caption "Servicing of the
Mortgage Loans -- Loan Payment Record" in the accompanying prospectus, establish
and maintain or cause to be established and maintained a separate account (the
"Collection Account") for the certificates for the collection of payments on the
mortgage loans; provided, however, that such action will not be required if
GECMSI delivers to the Trustee a letter from each rating agency which originally
rated the certificates to the effect that the failure to take such action would
not cause such rating agency to withdraw or reduce its then current rating of
such certificates. If established, such Collection Account would be:
 
     - maintained with a depository institution the debt obligations of which
       are, at the time of any deposit therein, rated by each of Fitch IBCA Inc.
       ("Fitch") and S&P in one of its two highest long-term rating categories
       and by S&P in its highest short-term rating category;
 
     - an account or accounts the deposits in which are fully insured by either
       the Bank Insurance Fund (the "BIF") of the Federal Deposit Insurance
       Corporation (the "FDIC") or the Savings Association Insurance Fund (as
       successor to the Federal Savings and Loan Insurance Corporation) of the
       FDIC (the "SAIF");
 
     - an account or accounts with a depository institution, which accounts are
       insured by the BIF or SAIF (to the limits established by the FDIC), and
       which uninsured deposits are invested in United States government
       securities or other high quality investments, or are otherwise secured to
       the extent required by Fitch and S&P such that, as evidenced by an
       opinion of counsel, the holders of the certificates have a claim with
       respect to the funds in the account or a perfected first security
       interest against any collateral securing such funds that is superior to
       claims of any other
 
                                      S-60
<PAGE>   61
 
       depositors or creditors of the depository institution with which the
       account is maintained;
 
     - a trust account maintained with the corporate trust department of a
       federal or state chartered depository institution or trust company with
       trust powers and acting in its fiduciary capacity for the benefit of the
       Trustee; or
 
     - an account as will not cause either Fitch or S&P to downgrade or withdraw
       its then current ratings assigned to the certificates.
 
If a Collection Account is established for the certificates, all amounts
credited or debited to the Loan Payment Record in the manner described under the
caption "Servicing of the Mortgage Loans -- Loan Payment Record" will instead be
deposited or withdrawn from the Collection Account. See "Servicing of the
Mortgage Loans -- Loan Payment Record" in the accompanying prospectus.
 
     Prior to the occurrence of a Trigger Event, GECMSI will transfer to the
Certificate Account, in next day funds, the Available Funds for the related
Distribution Date on the business day immediately preceding such Distribution
Date.
 
ADVANCES
 
     In the event that any mortgagor fails to make any payment of principal or
interest required under the terms of a mortgage loan, GECMSI will advance the
entire amount of such payment, net of the applicable servicing fee, less the
amount of any such payment that GECMSI reasonably believes will not be
recoverable out of liquidation proceeds or otherwise. See "Servicing of the
Mortgage Loans -- Advances" in the accompanying prospectus for more information.
 
     The Trustee will make advances of delinquent principal and interest
payments in the event of a failure by GECMSI to perform its obligation to do so,
provided that the Trustee will not make such advance to the extent that it
reasonably believes the payment will not be recoverable to it out of related
liquidation or insurance proceeds or otherwise. The Trustee will be entitled to
reimbursement for advances in a manner similar to GECMSI's entitlement as
described in the accompanying prospectus.
 
     As a result of the subordination of the junior certificates, the effect of
reimbursements to GECMSI or the Trustee of previous advances from liquidation or
insurance proceeds and of nonrecoverable advances will generally be borne by the
holders of the junior certificates (to the extent then outstanding) in inverse
order of priority before they are borne by holders of the senior certificates.
 
PURCHASES OF DEFAULTED MORTGAGE LOANS
 
     Under the Agreement, GECMSI will have the option (but not the obligation)
to purchase any mortgage loan as to which the mortgagor has failed to make
unexcused payment in full of three or more scheduled payments of principal and
interest (a "Defaulted Mortgage Loan"). Any such purchase will be for a price
equal to 100% of the outstanding principal balance of such mortgage loan, plus
accrued and unpaid interest thereon at the Net Mortgage Rate (less any amounts
representing previously unreimbursed advances). The purchase price for any
Defaulted Mortgage Loan will be deposited in the Certificate Account on the
business day prior to the Distribution Date on which the proceeds of such
purchase are to be distributed to the certificateholders.
 
                                      S-61
<PAGE>   62
 
SERVICING COMPENSATION, COMPENSATING INTEREST AND PAYMENT OF EXPENSES
 
     GECMSI's primary compensation for its servicing activities will come from
the payment to it, with respect to each interest payment on any mortgage loan,
of the servicing fee at the rate described below. As to each mortgage loan, the
servicing fee rate will be a fixed rate per annum of the outstanding principal
balance of such mortgage loan, expected to range from approximately 0.20% to
0.29%, with an anticipated initial weighted average rate of between
approximately 0.23% and 0.27%. The aggregate servicing compensation to GECMSI
could vary depending on the prepayment experience of the mortgage loans. The
servicing compensation of any direct servicer of any mortgage loan will be paid
out of the related servicing fee, and GECMSI will retain the balance of the
servicing fee as part of its servicing compensation (subject to its obligation
to make Compensating Interest Payments, as described below).
 
     To the extent any voluntary prepayment results in an Interest Shortfall (as
described in clauses (1) and (2) of the definition thereof) with respect to any
Distribution Date, GECMSI will be obligated to remit an amount (such amount, a
"Compensating Interest Payment") sufficient to pass through to
certificateholders the full amount of interest to which they would have been
entitled in the absence of such prepayments, but in no event greater than the
lesser of (a) 1/12th of 0.125% of the Pool Scheduled Principal Balance for such
Distribution Date and (b) the aggregate amount received by GECMSI on account of
its servicing fees (net of any servicing compensation paid to any direct
servicer) in connection with such Distribution Date. Because the net amount
received by GECMSI on account of its servicing fee is generally less in the case
of mortgage loans master-serviced by GECMSI than in the case of mortgage loans
GECMSI services directly, the amounts available for any Compensating Interest
Payment with respect to any Distribution Date will generally decrease to the
extent the proportion of Outstanding Mortgage Loans master-serviced by GECMSI
increases, and increase to the extent the proportion of such mortgage loans
decreases. It is expected that no more than 8% of the mortgage loans (by
aggregate Scheduled Principal Balance as of the Cut-off Date) will be
master-serviced by GECMSI. This percentage could vary over time, however, if
mortgage loans directly serviced by GECMSI experience a disproportionately high
or low level of prepayments or defaults relative to mortgage loans
master-serviced by GECMSI. In addition, the proportion of master-serviced
mortgage loans could be affected as a result of (1) the exercise by GECMSI of
its right under the Agreement to contract with third parties to directly service
mortgage loans, with GECMSI becoming the master servicer of such mortgage loans,
or (2) the substitution of any mortgage loans under the Agreement.
 
     GECMSI will retain, as additional servicing compensation, amounts in
respect of interest paid by borrowers in connection with any principal
prepayment in full received by GECMSI (or, with respect to mortgage loans
master-serviced by GECMSI, of which GECMSI receives notice) from the first day
through the fifteenth day of each month, other than the month of the Cut-off
Date.
 
     GECMSI will pay expenses incurred in connection with its responsibilities
under the Agreement, subject to limited reimbursement as described herein and in
the accompanying prospectus. See "Servicing of the Mortgage Loans -- Servicing
and Other Compensation and Payment of Expenses" in the accompanying prospectus
for information regarding other possible compensation to GECMSI.
 
                                      S-62
<PAGE>   63
 
TRUSTEE
 
     The Trustee for the certificates offered hereby will be State Street Bank
and Trust Company, a Massachusetts banking corporation organized and existing
under the laws of the Commonwealth of Massachusetts. The Corporate Trust Office
of the Trustee is located at Two International Place, Boston, Massachusetts.
 
OPTIONAL TERMINATION
 
     GECMSI may, at its option, repurchase all of the mortgage loans underlying
the certificates and thereby effect the early retirement of the certificates and
cause the termination of the trust and the REMIC constituted by the trust on any
Distribution Date after the aggregate Scheduled Principal Balance of the
mortgage loans is less than 10% of the aggregate Scheduled Principal Balance
thereof as of the Cut-off Date. Under the Agreement, the Trustee will provide
notice to certificateholders of this final distribution. This notice will state:
 
          (1) the Distribution Date on which the final distribution will be
     made;
 
          (2) the amount of the final distribution; and
 
          (3) that the final distribution on each certificate will be paid only
     upon surrender of such certificate.
 
     GECMSI may not exercise the foregoing option unless the Trustee has
received an opinion of counsel that the exercise of such option will not subject
the trust to a tax on prohibited transactions or result in the failure of the
trust to qualify as a REMIC.
 
     In accordance with the Agreement, any such repurchase by GECMSI of the
assets included in the trust will be at a price equal to the sum of:
 
          (1) 100% of the unpaid principal balance of each mortgage loan in the
     trust, other than a mortgage loan described in clause (2) below, as of the
     first day of the month of such repurchase, plus accrued and unpaid interest
     thereon to the first day of the month of such repurchase at the related Net
     Mortgage Rate, less any amounts representing previously unreimbursed
     advances; and
 
          (2) the appraised value of any property acquired in respect of a
     related mortgage loan, less any amounts representing previously
     unreimbursed advances in respect thereof and a good faith estimate of
     liquidation expenses.
 
     The Available Funds on the final Distribution Date will be allocated to
each class of certificates in accordance with the priorities described under
"Description of the Certificates -- Distributions on the
Certificates -- Allocation of Available Funds." Accordingly, if the Available
Funds on the final Distribution Date are less than the aggregate principal
balance of all outstanding certificates plus accrued and unpaid interest
thereon, then in the event that such Distribution Date occurs:
 
     - prior to the Cross-Over Date, the resulting shortfall will be borne by
       the certificates in inverse order of their related payment priorities;
       and
 
     - on or after the Cross-Over Date, such shortfall will be borne pro rata
       among such certificates.
 
     No holder of any certificates will be entitled to any unanticipated
recoveries received with respect to any mortgage loan after the termination of
the trust. See "Servicing of the
 
                                      S-63
<PAGE>   64
 
Mortgage Loans -- Unanticipated Recoveries of Losses on the Mortgage Loans" in
the prospectus.
 
VOTING RIGHTS
 
     The Class S Certificates will be allocated 1% of the votes and the other
classes of certificates in the aggregate will be allocated 99% of the votes
eligible to be cast in connection with any vote of all certificateholders under
the Agreement.
 
     Votes allocated to the certificates (other than the Class S Certificates)
under the Agreement will be allocated among the classes (and among the
certificates within each such class) in proportion to their Class Certificate
Principal Balances or Certificate Principal Balances, as the case may be.
 
FEDERAL INCOME TAX CONSEQUENCES
 
     The following discussion, insofar as it states conclusions of law,
represents the opinion of Cleary, Gottlieb, Steen & Hamilton, special counsel to
GECMSI.
 
     An election will be made to treat the trust as a REMIC for federal income
tax purposes.
 
     The certificates other than the residual certificates (the "Regular
Certificates") will be designated as "regular interests" in the REMIC and the
residual certificates will be designated as the "residual interest" in the
REMIC.
 
Regular Certificates
 
     The Regular Certificates generally will be treated as debt instruments
issued by the REMIC for federal income tax purposes. Income on Regular
Certificates must be reported under an accrual method of accounting. Certain
classes of Regular Certificates may be issued with original issue discount in an
amount equal to the excess of their initial respective Class Certificate
Principal Balances (plus accrued interest from the last day preceding the issue
date corresponding to a Distribution Date through the issue date), over their
issue prices (including all accrued interest). The prepayment assumption that is
to be used in determining the rate of accrual of original issue discount and
whether the original issue discount is considered de minimis, and that may be
used by a holder of a Regular Certificate to amortize premium, will be 275% of
the Prepayment Assumption. No representation is made as to the actual rate at
which the mortgage loans will prepay. See "Federal Income Tax
Consequences -- REMIC Certificates -- Income from Regular Certificates" in the
accompanying prospectus.
 
     The requirement to report income on a Regular Certificate under an accrual
method may result in the inclusion of amounts in income that are not currently
distributed in cash. In the case of a junior certificate, accrued income may
exceed cash distributions as a result of the preferential right of classes of
senior certificates to receive cash distributions in the event of losses or
delinquencies on mortgage loans. Prospective purchasers of junior certificates
should consult their tax advisors regarding the timing of income from those
certificates and the timing and character of any deductions that may be
available with respect to principal or accrued interest that is not paid. See
"Federal Income Tax Consequences -- REMIC Certificates -- Income from Regular
Certificates" in the accompanying prospectus.
 
                                      S-64
<PAGE>   65
 
Residual Certificates
 
     The holders of the residual certificates must include the taxable income of
the REMIC in their federal taxable income. The resulting tax liability of the
holders may exceed cash distributions to such holders during certain periods.
All or a portion of the taxable income from a residual certificate recognized by
a holder may be treated as "excess inclusion" income, which with limited
exceptions is subject to U.S. federal income tax in all events.
 
     Under Treasury regulations, the residual certificates may be considered to
be "noneconomic residual interests" at the time they are issued, in which event
certain transfers thereof would be disregarded for federal income tax purposes.
 
     Prospective purchasers of a residual certificate should consider carefully
the tax consequences of an investment in residual certificates discussed in the
prospectus and should consult their own tax advisors with respect to those
consequences. See "Federal Income Tax Consequences -- REMIC
Certificates -- Income from Residual Certificates -- Taxation of Certain Foreign
Investors -- Servicing Compensation and Other REMIC Pool Expense -- Transfers of
Residual Certificates."
 
ERISA CONSIDERATIONS
 
     As described in the prospectus under "ERISA Considerations," the Employee
Retirement Income Security Act of 1974, as amended ("ERISA"), and the Internal
Revenue Code of 1986 (the "Code") impose certain duties and restrictions on any
person which is an employee benefit plan within the meaning of Section 3(3) of
ERISA or a plan subject to Section 4975 of the Code or any person utilizing the
assets of such employee benefit plan or other plan (an "ERISA Plan") and certain
persons who perform services for ERISA Plans. For example, unless exempted, an
investment by an ERISA Plan in the certificates offered hereby may constitute or
give rise to a prohibited transaction under ERISA or Section 4975 of the Code.
 
     The United States Department of Labor (the "DOL") has issued to Salomon
Smith Barney Inc. ("Salomon Smith Barney") an individual administrative
exemption, Prohibited Transaction Exemption 89-89 (55 Fed. Reg. 42589, October
17, 1989), as amended (the "Exemption"), from certain of the prohibited
transaction provisions 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 senior
certificates offered hereby 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 senior certificates offered
hereby are the following:
 
     - Salomon Smith Barney is the sole underwriter or the manager or co-manager
       of the underwriting syndicate, for such certificates;
 
     - the certificates are rated in one of the three highest generic rating
       categories by Fitch, Moody's Investors Service, Inc., S&P or Duff &
       Phelps Credit Rating Co. at the time of the acquisition of such
       certificates by the ERISA Plan;
 
     - the certificates represent a beneficial ownership interest in, among
       other things, obligations that bear interest or are purchased at a
       discount and which are secured by single-family residential, multifamily
       residential or commercial real property
 
                                      S-65
<PAGE>   66
 
       (including obligations secured by leasehold interests on commercial real
       property), or fractional undivided interests in such obligations;
 
     - the certificates are not subordinated to other certificates issued by the
       trust in respect of the mortgage pool;
 
     - the ERISA Plan investing in such 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 acquisition of the certificates is on terms that are at least as
       favorable to the ERISA Plan as they would be in an arm's length
       transaction with an unrelated third party;
 
     - the Trustee is not an affiliate of any member of the "Restricted Group"
       (as defined below); and
 
     - the compensation to Salomon Smith Barney represents not more than
       reasonable compensation for underwriting the certificates, the proceeds
       to GECMSI pursuant to the assignment of the mortgage loans (or interests
       therein) to the Trustee represent not more than the fair market value of
       such mortgage loans (or interests) and the sum of all payments made to
       and retained by GECMSI represents not more than reasonable compensation
       for GECMSI's services under the Agreement and reimbursement of GECMSI's
       reasonable expenses in connection therewith.
 
     In addition, if certain additional conditions specified in the Exemption
are satisfied, the Exemption may provide an exemption from the prohibited
transaction provisions of ERISA relating to possible self-dealing transactions
by fiduciaries who have discretionary authority, or render investment advice,
with respect to ERISA Plan assets used to purchase the senior certificates
offered hereby if the fiduciary (or its affiliate) is an obligor on any of the
mortgage loans.
 
     The Exemption would not be available with respect to ERISA Plans sponsored
by any of the following entities (or any affiliate of any such entity):
 
     - GECMSI;
 
     - Salomon Smith Barney or PaineWebber Incorporated ("PaineWebber");
 
     - the Trustee;
 
     - any entity that provides insurance or other credit enhancement to the
       trust in respect of the mortgage pool; or
 
     - any obligor with respect to mortgage loans included in the mortgage pool
       constituting more than five percent of the aggregate unamortized
       principal balance of the assets in such mortgage loan pool (the
       "Restricted Group").
 
     Before purchasing any certificate offered hereby, 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, and whether the conditions of any such exemption will be
applicable to such certificate.
 
     A substantially identical administrative exemption has been issued by the
DOL to PaineWebber. However, the Exemption does not apply to the initial
purchase, the holding or the subsequent resale of the Class M, Class B1 and
Class B2 Certificates because such certificates are subordinate to certain other
classes of certificates. ACCORDINGLY, ERISA PLANS MAY NOT PURCHASE THE CLASS M,
CLASS B1 OR CLASS B2 CERTIFICATES, except that any
 
                                      S-66
<PAGE>   67
 
insurance company may purchase such certificates with assets of its general
account if the exemptive relief granted by the DOL for transactions involving
insurance company general accounts in Prohibited Transaction Exemption 95-60, 60
Fed. Reg. 35925 (July 12, 1995) is available with respect to such investment.
Any insurance company proposing to purchase such certificates for its general
account should consider whether such relief would be available.
 
     Any fiduciary of an ERISA Plan considering whether to purchase any
certificate offered hereby should not only consider the applicability of
exemptive relief, but should also carefully review with its own legal advisors
the applicability of the fiduciary duty and prohibited transaction provisions of
ERISA and the Code to such investment. See "ERISA Considerations" in the
accompanying prospectus.
 
     A qualified pension plan or other entity that is exempt from federal income
taxation pursuant to Section 501 of the Code (a "Tax-Exempt Investor")
nonetheless will be subject to federal income taxation to the extent that its
income is "unrelated business taxable income" within the meaning of Section 512
of the Code. The residual certificates constitute the residual interest in the
REMIC constituted by the trust, and all "excess inclusions" allocated to the
residual certificates, if held by a Tax-Exempt Investor, will be considered
"unrelated business taxable income" and thus will be subject to federal income
tax. See "Federal Income Tax Consequences -- Residual Certificates" herein and
"Federal Income Tax Consequences -- Federal Income Tax Consequences for REMIC
Certificates -- Taxation of Residual Certificates" in the prospectus.
 
     The Agreement will contain certain restrictions on the transferability of
the Class M, Class B1 and Class B2 Certificates. See "Description of the
Certificates -- Book-Entry Certificates" herein. The Agreement provides that the
residual certificates may not be acquired by or transferred to an ERISA Plan.
See "Description of the Certificates -- Restrictions on Transfer of the Residual
Certificates" herein.
 
LEGAL INVESTMENT MATTERS
 
     The senior certificates offered hereby and the Class M Certificates will
constitute "mortgage related securities" for purposes of the Secondary Mortgage
Market Enhancement Act of 1984 ("SMMEA") so long as such certificates are rated
in one of the two highest rating categories by at least one nationally
recognized rating agency. As such, such certificates are legal investments for
certain entities to the extent provided in SMMEA. 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 certificates, as certain classes may be deemed to be
unsuitable investments under one or more of these rules, policies and guidelines
and certain restrictions may apply to investments in other classes. It should
also be noted that certain states have enacted 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 the certificates
constitute legal investments for such investors. See "Legal Investment Matters"
in the accompanying prospectus.
 
     The Class B1 and Class B2 Certificates will not constitute "mortgage
related securities" under SMMEA. The appropriate characterization of the Class
B1 and Class B2
 
                                      S-67
<PAGE>   68
 
Certificates under various legal investment restrictions, and thus the ability
of investors subject to these restrictions to purchase Class B1 or Class B2
Certificates, may be subject to significant interpretive uncertainties. All
investors whose investment authority is subject to legal restrictions should
consult their own legal advisors to determine whether, and to what extent, the
Class B1 or Class B2 Certificates will constitute legal investments for them.
 
     GECMSI makes no representation as to the proper characterization of the
Class B1 or Class B2 Certificates for legal investment of financial institution
regulatory purposes, or as to the ability of particular investors to purchase
the Class B1 or Class B2 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 Class B1 or Class B2 Certificates) may adversely affect
the liquidity of the Class B1 and Class B2 Certificates.
 
PLAN OF DISTRIBUTION
 
     Subject to the terms and conditions set forth in the respective
Underwriting Agreements between GECMSI and Salomon Smith Barney and GECMSI and
PaineWebber, the senior certificates offered hereby are being purchased from
GECMSI by Salomon Smith Barney, and the junior certificates offered hereby are
being purchased from GECMSI by PaineWebber, upon issuance. Distribution of the
certificates offered hereby will be made by the respective underwriters from
time to time in negotiated transactions or otherwise at varying prices to be
determined at the time of sale.
 
     Proceeds to GECMSI from the sale of the certificates offered hereby will be
approximately 99.4419287% of the aggregate initial Class Certificate Principal
Balance of the certificates offered hereby, plus accrued interest thereon from
the Cut-off Date to but excluding the date of initial issuance of the
certificates, but before deducting issuance expenses payable by GECMSI. In
connection with the purchase and sale of the certificates offered hereby,
Salomon Smith Barney and PaineWebber may be deemed to have received compensation
from GECMSI in the form of underwriting discounts.
 
     GECMSI has agreed to indemnify the underwriters against, or make
contributions to the underwriters with respect to, certain liabilities,
including liabilities under the Securities Act of 1933, as amended.
 
     PaineWebber has entered into an agreement with GECMSI to purchase the Class
B3, Class B4 and Class B5 Certificates simultaneously with the purchase of the
certificates offered hereby, subject to certain conditions.
 
CERTIFICATE RATINGS
 
     It is a condition of issuance of the certificates that the senior
certificates offered hereby, other than the Class A4 Certificates, be rated
"AAA" by each of Fitch and S&P, that the Class A4 Certificates be rated "AAA" by
Fitch and "AAAr" by S&P and that the Class M, Class B1 and Class B2 Certificates
be rated "AA," "A" and "BBB," respectively, by Fitch.
 
                                      S-68
<PAGE>   69
 
     The ratings assigned by Fitch to mortgage pass-through certificates address
the likelihood of the receipt by certificateholders of all distributions to
which such certificateholders are entitled. Fitch's ratings address the
structural and legal aspects associated with the certificates, including the
nature of the underlying mortgage loans. Fitch's ratings on mortgage
pass-through certificates do not represent any assessment of the likelihood or
rate of principal prepayments. The ratings do not address the possibility that
certificateholders might suffer a lower than anticipated yield.
 
     S&P's ratings on mortgage pass-through certificates address the likelihood
of receipt by certificateholders of payments required under the operative
agreements. S&P's ratings take into consideration the credit quality of the
mortgage pool including any credit support providers, structural and legal
aspects associated with the certificates, and the extent to which the payment
stream of the mortgage pool is adequate to make payment required under the
certificates. S&P's ratings on the certificates do not, however, constitute a
statement regarding the 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. The "r" symbol is appended to the rating by S&P of those
certificates that S&P believes may experience high volatility or high
variability in expected returns due to non-credit risks. The absence of the "r"
symbol in the ratings of other certificates offered hereby should not be taken
as an indication that such certificates will exhibit no volatility or
variability in return.
 
     The ratings of the certificates should be evaluated independently from
similar ratings on other types of securities. 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.
 
     GECMSI has not requested a rating of the certificates offered hereby by any
rating agency other than Fitch and S&P and GECMSI has not provided information
relating to the certificates offered hereby or the mortgage loans to any rating
agency other than Fitch and S&P. However, there can be no assurance as to
whether any other rating agency will rate the certificates offered hereby or, if
another rating agency rates such certificates, what rating would be assigned to
such certificates by such rating agency. Any such unsolicited rating assigned by
another rating agency to the certificates offered hereby may be lower than the
rating assigned to such certificates by either, or both, of Fitch and S&P.
 
LEGAL MATTERS
 
     Certain legal matters in respect of the certificates will be passed upon
for GECMSI by Cleary, Gottlieb, Steen & Hamilton, New York, New York, and for
the underwriters by Brown & Wood LLP, Washington, D.C.
 
                                      S-69
<PAGE>   70
 
INDEX OF CERTAIN PROSPECTUS SUPPLEMENT DEFINITIONS
 
<TABLE>
<CAPTION>
DEFINED TERM                        PAGE
- ------------                     ----------
<S>                              <C>
Accrued Certificate Interest...        S-27
Adjustment Amount..............        S-40
Agreement......................        S-20
Allocable Share................        S-36
Available Funds................        S-23
Bankruptcy Coverage Termination
  Date.........................        S-39
Bankruptcy Loss................        S-37
Bankruptcy Loss Amount.........        S-39
beneficial owner...............        S-21
BIF............................        S-60
Book-Entry Certificates........        S-21
Certificate Principal
  Balance......................        S-27
Class A5 Distribution
  Percentage...................        S-32
Class A5 Percentage............        S-32
Class A5 Principal Distribution
  Amount.......................        S-32
Class B Certificates...........        S-36
Class Certificate Principal
  Balances.....................        S-23
Class PO Deferred Amount.......        S-37
Class PO Deferred Payment
  Writedown Amount.............        S-28
Class PO Principal Distribution
  Amount.......................        S-34
Class Prepayment Distribution
  Trigger......................        S-36
Code...........................        S-65
Collection Account.............        S-60
Compensating Interest
  Payment......................        S-62
Cooperative Loan...............        S-16
Cross-Over Date................        S-25
Cut-off Date...................        S-13
Debt Service Reduction.........        S-37
Defaulted Mortgage Loan........        S-61
Deficient Valuation............        S-36
Discount Mortgage Loan.........        S-30
Distribution Date..............        S-23
DOL............................        S-65
</TABLE>
 
<TABLE>
<CAPTION>
DEFINED TERM                        PAGE
- ------------                     ----------
<S>                              <C>
ERISA..........................        S-65
ERISA Plan.....................        S-65
Excess Loss....................        S-38
Exemption......................        S-65
FDIC...........................        S-60
Financial Intermediary.........        S-21
Fitch..........................        S-60
Fraud Coverage Termination
  Date.........................        S-39
Fraud Loss.....................        S-37
Fraud Loss Amount..............        S-39
GECMSI.........................        S-13
Group I Final Distribution
  Date.........................        S-32
Group I Senior Certificates....        S-24
Interest Accrual Period........        S-26
Interest Shortfall.............        S-28
Junior Certificate Writedown
  Amount.......................        S-28
Junior Optimal Principal
  Amount.......................        S-35
Junior Percentage..............        S-35
Junior Prepayment Percentage...        S-35
LIBOR Certificates.............        S-26
LIBOR Determination Date.......        S-29
Liquidated Mortgage Loan.......        S-37
Loss Allocation Limitation.....        S-38
Modeling Assumptions...........        S-49
Mortgage Loan Group............        S-50
mortgage related securities....         S-7
Net Interest Shortfall.........        S-28
Notional Principal Balance.....        S-28
NMR............................        S-30
Non-Book-Entry Certificates....        S-22
Non-discount Mortgage Loan.....        S-30
Non-PO Percentage..............        S-30
noneconomic residual
  interests....................        S-65
Original Junior Principal
  Balance......................        S-33
Outstanding Mortgage Loan......        S-14
</TABLE>
 
                                      S-70
<PAGE>   71
 
<TABLE>
<CAPTION>
DEFINED TERM                        PAGE
- ------------                     ----------
<S>                              <C>
PaineWebber....................        S-66
PO Percentage..................        S-30
Pool Scheduled Principal
  Balance......................        S-13
Prepayment Assumption..........        S-48
Prepayment Interest............        S-44
Prepayment Period..............        S-31
Realized Loss..................        S-36
Record Date....................        S-23
Regular Certificates...........        S-64
regular interests..............        S-64
residual interest..............        S-64
Restricted Group...............        S-66
S&P............................        S-60
SAIF...........................        S-60
</TABLE>
 
<TABLE>
<CAPTION>
DEFINED TERM                        PAGE
- ------------                     ----------
<S>                              <C>
Salomon Smith Barney...........        S-65
Scheduled Principal Balance....        S-13
Senior Final Distribution
  Date.........................        S-35
Senior Optional Principal
  Amount.......................        S-31
Senior Percentage..............        S-32
Senior Prepayment Percentage...        S-33
Senior Prepayment Percentage
  Stepdown Limitation..........        S-33
SMMEA..........................        S-67
Special Hazard Loss............        S-37
Special Hazard Loss Amount.....        S-39
Special Hazard Termination
  Date.........................        S-39
Tax-Exempt Investor............        S-67
Trustee........................        S-20
</TABLE>
 
                                      S-71
<PAGE>   72
 
- ------------------------------------------------------
- ------------------------------------------------------
 
    NO PERSON HAS BEEN AUTHORIZED TO GIVE ANY INFORMATION OR TO MAKE ANY
REPRESENTATIONS OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS SUPPLEMENT OR
PROSPECTUS. ANY INFORMATION OR REPRESENTATIONS GIVEN OR MADE OUTSIDE OF THIS
PROSPECTUS SUPPLEMENT AND PROSPECTUS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED. THIS PROSPECTUS SUPPLEMENT AND PROSPECTUS DO NOT CONSTITUTE AN OFFER
TO SELL OR THE SOLICITATION OF AN OFFER TO BUY ANY SECURITIES OTHER THAN THE
SECURITIES DESCRIBED IN THIS PROSPECTUS SUPPLEMENT OR AN OFFER TO SELL OR A
SOLICITATION OF AN OFFER TO BUY IN ANY CIRCUMSTANCES IN WHICH SUCH OFFER OR
SOLICITATION IS UNLAWFUL. THE INFORMATION CONTAINED IN THE PROSPECTUS SUPPLEMENT
AND PROSPECTUS IS CORRECT ONLY AS OF THE DATE RELATING TO SUCH INFORMATION, AND
DELIVERY OF THIS PROSPECTUS SUPPLEMENT OR PROSPECTUS, OR ANY SALE MADE
THEREUNDER, SUBSEQUENT TO THE DATE OF THIS PROSPECTUS SUPPLEMENT SHALL NOT,
UNDER ANY CIRCUMSTANCES, CREATE AN IMPLICATION THAT THE INFORMATION IS CORRECT
AS OF THAT SUBSEQUENT DATE.
 
                                ---------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                  PAGE
<S>                                               <C>
                PROSPECTUS SUPPLEMENT
Summary of Terms................................   S-3
Risk Factors....................................   S-8
Description of the Mortgage Pool and the
  Mortgaged Properties..........................  S-13
Description of the Certificates.................  S-20
Yield and Weighted Average Life
  Considerations................................  S-43
GE Capital Mortgage Services, Inc. .............  S-58
Delinquency and Foreclosure Experience of
  GECMSI........................................  S-58
Use of Proceeds.................................  S-59
The Pooling and Servicing Agreement.............  S-60
Federal Income Tax Consequences.................  S-64
ERISA Considerations............................  S-65
Legal Investment Matters........................  S-67
Plan of Distribution............................  S-68
Certificate Ratings.............................  S-68
Legal Matters...................................  S-69
Index of Certain Prospectus Supplement
  Definitions...................................  S-70
                      PROSPECTUS
Description of the Certificates.................     1
The Trusts......................................     9
Credit Enhancement..............................    19
Yield, Maturity and Weighted Average Life
  Considerations................................    27
Servicing of the Mortgage Loans.................    31
The Pooling and Servicing Agreement.............    44
GE Capital Mortgage Services, Inc. .............    56
GE Capital Mortgage Funding Corporation.........    57
Where You Can Find More Information About GE
  Capital Mortgage Services, Inc. and GE Capital
  Mortgage Funding Corporation..................    58
The Guarantor...................................    59
Certain Legal Aspects of the Mortgage Loans.....    59
Legal Investment Matters........................    68
ERISA Considerations............................    70
Federal Income Tax Consequences.................    71
Plan of Distribution............................    89
Use of Proceeds.................................    90
Legal Matters...................................    90
Financial Information...........................    90
Index of Certain Prospectus Definitions.........    91
</TABLE>
 
    Until June 21, 1999, all dealers that effect transactions in these
securities, whether or not participating in this offering, 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.
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
- ------------------------------------------------------
 
                       GE CAPITAL MORTGAGE SERVICES, INC.
                                  1999-3 TRUST
                                    (ISSUER)
 
                       GE CAPITAL MORTGAGE SERVICES, INC.
                            (DEPOSITOR AND SERVICER)
 
                                  $494,623,500
                                 (APPROXIMATE)
 
                                 REMIC MORTGAGE
                           PASS-THROUGH CERTIFICATES,
                                 SERIES 1999-3
                                  ------------
                             PROSPECTUS SUPPLEMENT
                                  ------------
                              SALOMON SMITH BARNEY
                            PAINEWEBBER INCORPORATED
                                 March 23, 1999
- ------------------------------------------------------
- ------------------------------------------------------


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