RIVERSIDE PARK ASSOCIATES LP
SC 14D1/A, 1999-06-30
OPERATORS OF APARTMENT BUILDINGS
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 29549

                              -------------------
                                AMENDMENT NO. 1
                                       TO
                                 SCHEDULE 14D-1
              TENDER OFFER STATEMENT PURSUANT TO SECTION 14(d)(1)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                                      AND
                                  SCHEDULE 13D
                   UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 1)


                 RIVERSIDE PARK ASSOCIATES LIMITED PARTNERSHIP
                           (Name of Subject Company)

                             AIMCO PROPERTIES, L.P.
                                    (Bidder)

                     UNITS OF LIMITED PARTNERSHIP INTEREST
                         (Title of Class of Securities)

                                      NONE
                     (CUSIP Number of Class of Securities)



                                PATRICK J. FOYE
                  APARTMENT INVESTMENT AND MANAGEMENT COMPANY
                     1873 SOUTH BELLAIRE STREET, 17TH FLOOR
                             DENVER, COLORADO 80222
                                 (303) 757-8101
            (Name, Address and Telephone Number of Person Authorized
           to Receive Notices and Communications on Behalf of Bidder)


                                    COPY TO:

                              JONATHAN L. FRIEDMAN
                    SKADDEN, ARPS, SLATE, MEAGHER & FLOM LLP
                          300 SOUTH GRAND, 34TH FLOOR
                         LOS ANGELES, CALIFORNIA 90071
                                 (213) 687-5000

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


<PAGE>   2


                           CALCULATION OF FILING FEE

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

Transaction Valuation*     $3,194,660              Amount of Filing Fee: $638.93

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

*        For purposes of calculating the fee only. This amount assumes the
         purchase of 168.14 units of limited partnership interest of the
         subject partnership for $19,000 per unit. The amount of the filing
         fee, calculated in accordance with Section 14(g)(1)(B)(3) and Rule 0-
         11(d) under the Securities Exchange Act of 1934, as amended, equals
         1/50th of one percent of the aggregate of the cash offered by the
         bidder.

[ ]      Check box if any part of the fee is offset as provided by Rule
         0-11(a)(2) and identify the filing with which the offsetting fee was
         previously paid. Identify the previous filing by registration
         statement number or the form or schedule and the date of its filing.


Amount Previously Paid:   $429.97       Filing Parties:   AIMCO Properties, L.P.


Form or Registration No.: Schedule 14D  Date Filed:       May 14, 1999




                                   Page 1 of 4

<PAGE>   3


       AMENDMENT NO. 1 TO SCHEDULE 14D-1/AMENDMENT NO. 1 TO SCHEDULE 13D


                  This Statement (the "Statement") constitutes (a) Amendment
No. 1 to the initial Schedule 14D-1 of AIMCO Properties, L.P. (the "AIMCO OP"),
relating to AIMCO OP's offer to purchase units of limited partnership interest
("Units") of Riverside Park Associates Limited Partnership (the "Partnership");
and (b) Amendment No. 1 to the Schedule 13D (the "Schedule 13D") of Apartment
Investment and Management Company ("AIMCO"), originally filed with the
Securities and Exchange Commission on May 14, 1999, by AIMCO, AIMCO-GP, Inc.
("AIMCO-GP") and AIMCO OP. The item numbers and responses thereto are set forth
below in accordance with the requirements of Schedule 14D-1.

ITEM 11.          MATERIAL TO BE FILED AS EXHIBITS.

<TABLE>
<S>                        <C>
                  (a)(1)   Offer to Purchase, dated May 13, 1999 (previously filed).
                  (a)(2)   Letter of Transmittal and related Instructions.
                  (a)(3)   Letter, dated May 13, 1999, from AIMCO OP to the Limited Partners of the
                           Partnership (previously filed).
                  (a)(4)   Supplement to Offer to Purchase, dated June 29, 1999.
                  (a)(5)   Letter, dated June 29, 1999, from AIMCO OP to the Limited Partners of the
                           Partnership.
                  (b)      Amended and Restated Credit Agreement (Unsecured
                           Revolver-to-Term Facility), dated as of October 1,
                           1998, among AIMCO OP, Bank of America National Trust
                           and Savings Association, and BankBoston, N.A.
                           (Exhibit 10.1 to AIMCO's Current Report on Form 8-K,
                           dated October l, 1998, is incorporated herein by
                           this reference).
                  (b)(2)   First Amendment to Credit Agreement, dated as of
                           November 6, 1998, by and among AIMCO OP, the
                           financial institutions listed on the signature pages
                           thereof and Bank of America National Trust and
                           Savings Association (Exhibit 10.2 to AIMCO's Annual
                           Report on Form 10-K for the fiscal year ended
                           December 31, 1998, is incorporated herein by this
                           reference).
                  (c)      Not applicable.
                  (d)      Not applicable.
                  (e)      Not applicable.
                  (f)      Not applicable.
                  (z)(1)   Agreement of Joint Filing, dated May 13, 1999, among
                           AIMCO, AIMCO-GP and AIMCO OP (previously filed).
</TABLE>



                                  Page 2 of 4

<PAGE>   4


                                   SIGNATURE

                  After due inquiry and to the best of my knowledge and belief,
I certify that the information set forth in this statement is true, complete
and correct.

Dated:  June 29, 1999
                                        AIMCO PROPERTIES, L.P.

                                        By: AIMCO-GP, INC.
                                             (General Partner)

                                        By: /s/ Patrick J. Foye
                                            ----------------------------------
                                             Executive Vice President

                                        AIMCO-GP, INC.

                                        By: /s/ Patrick J. Foye
                                            ----------------------------------
                                             Executive Vice President

                                        APARTMENT INVESTMENT
                                        AND MANAGEMENT COMPANY

                                        By: /s/ Patrick J. Foye
                                            ----------------------------------
                                             Executive Vice President



                                  Page 3 of 4

<PAGE>   5


                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
EXHIBIT NO.                                 DESCRIPTION
- -----------                                 -----------


<S>               <C>
         (a)(1)   Offer to Purchase, dated May 13, 1999 (previously filed).
         (a)(2)   Letter of Transmittal and related Instructions.
         (a)(3)   Letter, dated May 13, 1999, from AIMCO OP to the Limited Partners of the
                  Partnership (previously filed).
         (a)(4)   Supplement to Offer to Purchase, dated June 29, 1999.
         (a)(5)   Letter, dated June 29, 1999, from AIMCO OP to the Limited Partners of the
                  Partnership.
         (b)      Amended and Restated Credit Agreement (Unsecured
                  Revolver-to-Term Facility), dated as of October 1, 1998,
                  among AIMCO OP, Bank of America National Trust and Savings
                  Association, and BankBoston, N.A. (Exhibit 10.1 to AIMCO's
                  Current Report on Form 8-K, dated October l, 1998, is
                  incorporated herein by this reference).
         (b)(2)   First Amendment to Credit Agreement, dated as of November 6,
                  1998, by and among AIMCO OP, the financial institutions
                  listed on the signature pages thereof and Bank of America
                  National Trust and Savings Association (Exhibit 10.2 to
                  AIMCO's Annual Report on Form 10-K for the fiscal year ended
                  December 31, 1998, is incorporated herein by this reference).
         (c)      Not applicable.
         (d)      Not applicable.
         (e)      Not applicable.
         (f)      Not applicable.
         (z)(1)   Agreement of Joint Filing, dated May 13, 1999, among AIMCO,
                  AIMCO-GP and AIMCO OP (previously filed).
</TABLE>


                                  Page 4 of 4

<PAGE>   1
                                                                EXHIBIT 99(a)(2)



                             LETTER OF TRANSMITTAL

                   TO TENDER UNITS OF LIMITED PARTNERSHIP IN
                 RIVERSIDE PARK ASSOCIATES LIMITED PARTNERSHIP
                        PURSUANT TO AN OFFER TO PURCHASE
                               DATED MAY 13, 1999
                                       BY
                             AIMCO PROPERTIES, L.P.

- --------------------------------------------------------------------------------
                      THE OFFER AND WITHDRAWAL RIGHTS WILL
                      EXPIRE AT 5:00 P.M., NEW YORK TIME,
                       ON JULY 13, 1999, UNLESS EXTENDED.
- --------------------------------------------------------------------------------

                     The Information Agent for the offer is:

                      RIVER OAKS PARTNERSHIP SERVICES, INC.

     By Mail:            By Overnight Courier:                 By Hand:
  P.O. Box 2065            111 Commerce Road              111 Commerce Road
S. Hackensack, N.J.      Carlstadt, N.J. 07072          Carlstadt, N.J. 07072
    07606-2065        Attn.: Reorganization Dept.    Attn.: Reorganization Dept.


                                  By Telephone:
                            TOLL FREE (888) 349-2005



                          DESCRIPTION OF UNITS TENDERED

<TABLE>
<CAPTION>
Name(s) and Address(es) of Registered Holder(s) (Please      Units in Riverside Park Associates Limited Partnership
 indicate changes or corrections to the name, address
    and tax identification number printed below.)
- -------------------------------------------------------      ------------------------------------------------------
                                                                                    2. Number of        3. Total
                                                             1. Total Number of    Units Tendered      Number of
                                                                  Units Owned         for Cash       Units Tendered
                                                                      (#)               (#)               (#)
- -----------------------------------------------------------  ------------------    --------------    --------------
<S>                                                          <C>                   <C>               <C>


                                                             ------------------    --------------    --------------
</TABLE>

<PAGE>   2

To participate in the offer, you must send a duly completed and executed copy of
this Letter of Transmittal and any other documents required by this Letter of
Transmittal so that such documents are received by River Oaks Partnership
Services, Inc., the Information Agent, on or prior to July 13, 1999, unless
extended (the "Expiration Date"). THE METHOD OF DELIVERY OF THIS LETTER OF
TRANSMITTAL AND ALL OTHER REQUIRED DOCUMENTS IS AT YOUR OPTION AND RISK, AND
DELIVERY WILL BE DEEMED MADE ONLY WHEN ACTUALLY RECEIVED BY THE INFORMATION
AGENT. IF DELIVERY IS BY MAIL, REGISTERED MAIL WITH RETURN RECEIPT REQUESTED IS
RECOMMENDED. IN ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO ASSURE TIMELY
DELIVERY. DELIVERY OF THIS LETTER OF TRANSMITTAL OR ANY OTHER REQUIRED DOCUMENTS
TO AN ADDRESS OTHER THAN AS SET FORTH ABOVE DOES NOT CONSTITUTE VALID DELIVERY.


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

         IF YOU HAVE THE CERTIFICATE ORIGINALLY ISSUED TO REPRESENT YOUR
          INTEREST IN THE PARTNERSHIP PLEASE SEND IT TO THE INFORMATION
                     AGENT WITH THIS LETTER OF TRANSMITTAL.

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

     FOR INFORMATION OR ASSISTANCE IN CONNECTION WITH THE OFFER OR THE
COMPLETION OF THIS LETTER OF TRANSMITTAL, PLEASE CONTACT THE INFORMATION AGENT
AT (888) 349-2005 (TOLL FREE).

     THE INSTRUCTIONS ACCOMPANYING THIS LETTER OF TRANSMITTAL SHOULD BE READ
CAREFULLY BEFORE THIS LETTER OF TRANSMITTAL IS COMPLETED.


                          SPECIAL PAYMENT INSTRUCTIONS
                         (See Instructions 2, 4 and 9)

     To be completed ONLY if the consideration for the purchase price of Units
accepted for payment is to be issued in the name of someone other than the
undersigned.

[ ] Issue consideration to:

Name
    ---------------------------------------------------------------------------
                             (Please Type or Print)

Address
       ------------------------------------------------------------------------

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

- --------------------------------------------------------------------------------
                               (Include Zip Code)


- --------------------------------------------------------------------------------
                   (Tax Identification or Social Security No.)
                            (See Substitute Form W-9)


                         SPECIAL DELIVERY INSTRUCTIONS
                         (See Instructions 2, 4 and 9)

     To be completed ONLY if the consideration for the purchase price of Units
accepted for payment is to be sent to someone other than the undersigned or to
the undersigned at an address other than that shown above.

[ ] Mail consideration to:

Name
    ---------------------------------------------------------------------------
                             (Please Type or Print)

Address
       ------------------------------------------------------------------------

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

- --------------------------------------------------------------------------------
                               (Include Zip Code)


                     NOTE: SIGNATURES MUST BE PROVIDED BELOW
               PLEASE READ THE ACCOMPANYING INSTRUCTIONS CAREFULLY


                                       2
<PAGE>   3

Ladies and Gentlemen:

    The undersigned hereby acknowledges that he or she has received and reviewed
(i) the Purchaser's Offer to Purchase, dated May 13, 1999 (the "Offer Date")
relating to the offer by AIMCO Properties, L.P. (the "Purchaser") to purchase
Limited Partnership Interests (the "Units") in Riverside Park Associates Limited
Partnership, a Delaware limited partnership (the "Partnership"), (ii) the
Supplement to the Offer to Purchase, dated June 29, 1999, and (iii) this Letter
of Transmittal and the Instructions hereto, as each may be supplemented or
amended from time to time (collectively, the "Offer").

    Upon the terms and subject to the conditions set forth in the Offer to
Purchase, and this Letter of Transmittal, the undersigned hereby tenders to the
Purchaser the Units set forth in the box above entitled "Description of Units
Tendered," including all interests in any limited partnership represented by
such units (collectively, the "Units"), at the price of $19,000 per Unit, less
the amount of distributions, if any, made by the Partnership from the Offer Date
until the Expiration Date (the "Offer Price"), net to the undersigned in cash,
without interest.

    Subject to and effective upon acceptance for payment of any of the Units
tendered hereby in accordance with the terms of the Offer, the undersigned
hereby irrevocably sells, assigns, transfers, conveys and delivers to, or upon
the order of, the Purchaser all right, title and interest in and to such Units
tendered hereby that are accepted for payment pursuant to the Offer, including,
without limitation, (i) all of the undersigned's interest in the capital of the
Partnership, and the undersigned's interest in all profits, losses and
distributions of any kind to which the undersigned shall at any time be entitled
in respect of the Units; (ii) all other payments, if any, due or to become due
to the undersigned in respect of the Units, under or arising out of the
agreement of limited partnership of the Partnership (the "Partnership
Agreement"), or any agreement pursuant to which the Units were sold (the
"Purchase Agreement"), whether as contractual obligations, damages, insurance
proceeds, condemnation awards or otherwise; (iii) all of the undersigned's
claims, rights, powers, privileges, authority, options, security interests,
liens and remedies, if any, under or arising out of the Partnership Agreement or
Purchase Agreement or the undersigned's ownership of the Units, including,
without limitation, all voting rights, rights of first offer, first refusal or
similar rights, and rights to be substituted as a limited partner of the
Partnership; and (iv) all present and future claims, if any, of the undersigned
against the Partnership, the other partners of the Partnership, or the general
partner and its affiliates, including the Purchaser, under or arising out of the
Partnership Agreement, the Purchase Agreement, the undersigned's status as a
limited partner, or the terms or conditions of the Offer, for monies loaned or
advanced, for services rendered, for the management of the Partnership or
otherwise.

    The undersigned hereby irrevocably constitutes and appoints the Purchaser
and any designees of the Purchaser as the true and lawful agent and
attorney-in-fact of the undersigned with respect to such Units, with full power
of substitution (such power of attorney being deemed to be an irrevocable power
coupled with an interest), to vote or act in such manner as any such attorney
and proxy or substitute shall, in its sole discretion, deem proper with respect
to such Units, to do all such acts and things necessary or expedient to deliver
such Units and transfer ownership of such Units on the partnership books
maintained by the general partner of the Partnership, together with all
accompanying evidence of transfer and authenticity to, or upon the order of, the
Purchaser, to sign any and all documents necessary to authorize the transfer of
the Units to the Purchaser including, without limitation, the "Transferor's
(Seller's) Application for Transfer" created by the National Association of
Securities Dealers, Inc., if required, and upon receipt by the Information Agent
(as the undersigned's agent) of the Offer Price, to become a substitute limited
partner, to receive any and all distributions made by the Partnership from and
after the Expiration Date of the Offer (regardless of the record date for any
such distribution), and to receive all benefits and otherwise exercise all
rights of beneficial ownership of such Units, all in accordance with the terms
of the Offer. This appointment is effective upon the purchase of the Units by
the Purchaser as provided in the Offer. Upon the purchase of Units pursuant to
the Offer, all prior proxies and consents given by the undersigned with respect
to such Units will be revoked and no subsequent proxies or consents may be given
(and if given will not be deemed effective).

    In addition to and without limiting the generality of the foregoing, the
undersigned hereby irrevocably (i) requests and authorizes (subject to and
effective upon acceptance for payment of any Unit tendered hereby) the
Partnership and its general partners to take any and all actions as may be
required to effect the transfer of the undersigned's Units to the Purchaser (or
its designee) and to admit the Purchaser as a substitute limited partner in the
Partnership under the


                                       3
<PAGE>   4

terms of the Partnership Agreement; (ii) empowers the Purchaser and its agent to
execute and deliver to each general partner a change of address form instructing
the general partner to send any and all future distributions to the address
specified in the form, and to endorse any check payable to or upon the order of
such unitholder representing a distribution to which the Purchaser is entitled
pursuant to the terms of the offer, in each case, in the name and on behalf of
the tendering unitholder; (iii) agrees not to exercise any rights pertaining to
the Units without the prior consent of the Purchaser; and (iv) requests and
consents to the transfer of the Units, to be effective on the books and records
of the Partnership as of March 1, 1999.

    NOTWITHSTANDING ANY PROVISION IN A PARTNERSHIP AGREEMENT OR ANY PURCHASE
AGREEMENT TO THE CONTRARY, THE UNDERSIGNED HEREBY DIRECTS EACH GENERAL PARTNER
OF THE PARTNERSHIP TO MAKE ALL DISTRIBUTIONS AFTER THE PURCHASER ACCEPTS THE
TENDERED UNITS FOR PAYMENT TO THE PURCHASER OR ITS DESIGNEE. Subject to and
effective upon acceptance for payment of any Unit tendered hereby, the
undersigned hereby requests that the Purchaser be admitted to the Partnership as
a substitute limited partner under the terms of the Partnership Agreement. Upon
request, the undersigned will execute and deliver additional documents deemed by
the Information Agent or the Purchaser to be necessary or desirable to complete
the assignment, transfer and purchase of Units tendered hereby and will hold any
distributions received from the Partnership after the Expiration Date in trust
for the benefit of the Purchaser and, if necessary, will promptly forward to the
Purchaser any such distributions immediately upon receipt. The Purchaser
reserves the right to transfer or assign, in whole or in part, from time to
time, to one or more of its affiliates, the right to purchase Units tendered
pursuant to the Offer, but any such transfer or assignment will not relieve the
Purchaser of its obligations under the Offer or prejudice the rights of
tendering unitholders to receive payment for Units validly tendered and accepted
for payment pursuant to the Offer.

    By executing this Letter of Transmittal, the undersigned represents that
either (i) the undersigned is not a plan subject to Title I of the Employee
Retirement Income Security Act of 1974, as amended ("ERISA"), or Section 4975 of
the Internal Revenue Code of 1986, as amended (the "Code"), or an entity deemed
to hold "plan assets" within the meaning of 29 C.F.R. Section 2510.3-101 of any
such plan, or (ii) the tender and acceptance of Units pursuant to the Offer will
not result in a nonexempt prohibited transaction under Section 406 of ERISA or
Section 4975 of the Code.

    The undersigned understands that a tender of Units to the Purchaser will
constitute a binding agreement between the undersigned and the Purchaser upon
the terms and subject to the conditions of the Offer. The undersigned recognizes
that under certain circumstances set forth in the Offer, the Purchaser may not
be required to accept for payment any of the Units tendered hereby. In such
event, the undersigned understands that any Letter of Transmittal for Units not
accepted for payment may be destroyed by the Purchaser (or its agent). EXCEPT AS
STATED IN THE OFFER, THIS TENDER IS IRREVOCABLE, PROVIDED THAT UNITS TENDERED
PURSUANT TO THE OFFER MAY BE WITHDRAWN AT ANY TIME PRIOR TO THE EXPIRATION DATE,
OR UNLESS ALREADY ACCEPTED FOR PAYMENT, ANY TIME AFTER JULY 11, 1999.

    THE UNDERSIGNED HAS BEEN ADVISED THAT THE PURCHASER IS AN AFFILIATE OF THE
GENERAL PARTNER OF THE PARTNERSHIP AND NO SUCH GENERAL PARTNER MAKES ANY
RECOMMENDATION AS TO WHETHER TO TENDER OR REFRAIN FROM TENDERING UNITS IN THE
OFFER. THE UNDERSIGNED HAS MADE HIS OR HER OWN DECISION TO TENDER UNITS.

    The undersigned hereby represents and warrants for the benefit of the
Partnership and the Purchaser that the undersigned owns the Units tendered
hereby and has full power and authority and has taken all necessary action to
validly tender, sell, assign, transfer, convey and deliver the Units tendered
hereby and that when the same are accepted for payment by the Purchaser, the
Purchaser will acquire good, marketable and unencumbered title thereto, free and
clear of all liens, restrictions, charges, encumbrances, conditional sales
agreements or other obligations relating to the sale or transfer thereof, and
such Units will not be subject to any adverse claims and that the transfer and
assignment contemplated herein are in compliance with all applicable laws and
regulations.

    Our records indicate that the undersigned owns the number of Units set forth
in the box above entitled "Description of Units Tendered" under the column
entitled "Total Number of Units Owned." If you would like to tender only a
portion of your Units, please so indicate in the space provided in the box above
entitled "Description of Units Tendered."


                                       4
<PAGE>   5

    All authority herein conferred or agreed to be conferred shall survive the
death or incapacity of the undersigned, and any obligations of the undersigned
shall be binding upon the heirs, personal representatives, trustees in
bankruptcy, legal representatives, and successors and assigns of the
undersigned.

    The undersigned further represents and warrants that, to the extent a
certificate evidencing the Units tendered hereby (the "original certificate") is
not delivered by the undersigned together with this Letter of Transmittal, (i)
the undersigned represents and warrants to the Purchaser that the undersigned
has not sold, transferred, conveyed, assigned, pledged, deposited or otherwise
disposed of any portion of the Units, (ii) the undersigned has caused a diligent
search of its records to be taken and has been unable to locate the original
certificate, (iii) if the undersigned shall find or recover the original
certificate evidencing the Units, the undersigned will immediately and without
consideration surrender it to the Purchaser; and (iv) the undersigned shall at
all times indemnify, defend, and save harmless the Purchaser and the
Partnership, its successors, and its assigns from and against any and all
claims, actions, and suits whether groundless or otherwise, and from and against
any and all liabilities, losses, damages, judgments, costs, charges, counsel
fees, and other expenses of every nature and character by reason of honoring or
refusing to honor the original certificate when presented by or on behalf of a
holder in due course of a holder appearing to or believed by the partnership to
be such, or by issuance or delivery of a replacement certificate, or the making
of any payment, delivery, or credit in respect of the original certificate
without surrender thereof, or in respect of the replacement certificate.


                                       5

<PAGE>   6

                                 SIGNATURE BOX
                              (See Instruction 2)

     Please sign exactly as your name is printed on the front of this Letter of
Transmittal. For joint owners, each joint owner must sign. (See Instruction 2).

     TRUSTEES, EXECUTORS, ADMINISTRATORS, GUARDIANS, ATTORNEYS-IN-FACT, OFFICERS
OF A CORPORATION OR OTHER PERSONS ACTING IN A FIDUCIARY OR REPRESENTATIVE
CAPACITY, PLEASE COMPLETE THIS BOX AND SEE INSTRUCTION 2.

     The signatory hereto hereby tenders the Units indicated in this Letter of
Transmittal to the Purchaser pursuant to the terms of the Offer, and certifies
under penalties of perjury that the statements in Box A, Box B and, if
applicable, Box C and Box D are true.


     X
       ------------------------------------------------------------------------
                            (Signature of Owner)

     X
       ------------------------------------------------------------------------
                            (Signature of Joint Owner)

     Name and Capacity (if other than individuals).
                                                    ---------------------------

     Title:
           --------------------------------------------------------------------

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


     --------------------------------------------------------------------------
     (City)                              (State)            (Zip)

     Area Code and Telephone No. (Day):
                                        ---------------------------------------

                                 (Evening):
                                            -----------------------------------

                        SIGNATURE GUARANTEE (IF REQUIRED)
                               (SEE INSTRUCTION 2)

     Name and Address of Eligible Institution:
                                              ---------------------------------

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

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

     Authorized Signature: X
                             --------------------------------------------------
     Name:
          ---------------------------------------------------------------------

     Title:                                               Date:
           -----------------------------------------           ----------------


                                       6
<PAGE>   7

                               TAX CERTIFICATIONS
                              (See Instruction 4)

     By signing the Letter of Transmittal in the Signature Box, the unitholder
certifies as true under penalty of perjury, the representations in Boxes A, B
and C below. Please refer to the attached Instructions for completing this
Letter of Transmittal and Boxes A, B and C below.

================================================================================
                                     BOX A
                              SUBSTITUTE FORM W-9
                          (See Instruction 4 - Box A)
- --------------------------------------------------------------------------------
     The unitholder hereby certifies the following to the Purchaser under
penalties of perjury:

         (i) The Taxpayer Identification No. ("TIN") printed (or corrected) on
the front of this Letter of Transmittal is the correct TIN of the unitholder,
unless the Units are held in an Individual Retirement Account ("IRA"); or if
this box [ ] is checked, the unitholder has applied for a TIN. If the unitholder
has applied for a TIN, a TIN has not been issued to the unitholder, and either
(a) the unitholder has mailed or delivered an application to receive a TIN to
the appropriate IRS Center or Social Security Administration Office, or (b) the
unitholder intends to mail or deliver an application in the near future (it
being understood that if the unitholder does not provide a TIN to the Purchaser,
31% of all reportable payments made to the unitholder will be withheld); and

         (ii) Unless this box [ ] is checked, the unitholder is not subject to
backup withholding either because the unitholder: (a) is exempt from backup
withholding; (b) has not been notified by the IRS that the unitholder is subject
to backup withholding as a result of a failure to report all interest or
dividends; or (c) has been notified by the IRS that such unitholder is no longer
subject to backup withholding.

     Note: Place an "X" in the box in (ii) above, only if you are unable to
certify that the unitholder is not subject to backup withholding.
================================================================================

================================================================================
                                      BOX B
                                FIRPTA AFFIDAVIT
                           (See Instruction 4 - Box B)
- --------------------------------------------------------------------------------
     Under Section 1445(e)(5) of the Internal Revenue Code and Treas. Reg.
1.1445-11T(d), a transferee must withhold tax equal to 10% of the amount
realized with respect to certain transfers of an interest in a partnership if
50% or more of the value of its gross assets consists of U.S. real property
interests and 90% or more of the value of its gross assets consists of U.S. real
property interests plus cash equivalents, and the holder of the partnership
interest is a foreign person. To inform the Purchaser that no withholding is
required with respect to the unitholder's Units in the Partnership, the person
signing this Letter of Transmittal hereby certifies the following under
penalties of perjury:

         (i) Unless this box [ ] is checked, the unitholder, if an individual,
is a U.S. citizen or a resident alien for purposes of U.S. income taxation, and
if other than an individual, is not a foreign corporation, foreign partnership,
foreign estate or foreign trust (as those terms are defined in the Internal
Revenue Code and Income Tax Regulations);

         (ii) The unitholder's U.S. social security number (for individuals) or
employer identification number (for non-individuals) is correct as furnished in
the blank provided for that purpose on the front of the Letter of Transmittal;

         (iii) The unitholder's home address (for individuals), or office
address (for non-individuals), is correctly printed (or corrected) on the front
of this Letter of Transmittal.

         The person signing this Letter of Transmittal understands that this
certification may be disclosed to the IRS by the Purchaser and that any false
statements contained herein could be punished by fine, imprisonment, or both.
================================================================================

================================================================================
                                      BOX C
                               SUBSTITUTE FORM W-8
                           (See Instruction 4 - Box C)
- --------------------------------------------------------------------------------
     By checking this box [ ], the person signing this Letter of Transmittal
hereby certifies under penalties of perjury that the unitholder is an "exempt
foreign person" for purposes of the Backup Withholding rules under the U.S.
Federal income tax laws, because the unitholder has the following
characteristics:

         (i)   Is a nonresident alien individual or a foreign corporation,
               partnership, estate or trust;

         (ii)  If an individual, has not been and plans not to be present in the
               U.S. for a total of 183 days or more during the calendar year;
               and

         (iii) Neither engages, nor plans to engage, in a U.S. trade or business
               that has effectively connected gains from transactions with a
               broker or barter exchange.
================================================================================


                                       7
<PAGE>   8

                                  INSTRUCTIONS
                      FOR COMPLETING LETTER OF TRANSMITTAL

1.   REQUIREMENTS OF TENDER. To be effective, a duly completed and signed Letter
     of Transmittal (or facsimile thereof) and any other required documents must
     be received by the Information Agent at one of its addresses (or its
     facsimile number) set forth herein before 5:00 p.m., New York Time, on the
     Expiration Date, unless extended. To ensure receipt of the Letter of
     Transmittal and any other required documents, it is suggested that you use
     overnight courier delivery or, if the Letter of Transmittal and any other
     required documents are to be delivered by United States mail, that you use
     certified or registered mail, return receipt requested.

   WHEN TENDERING, YOU MUST SEND ALL PAGES OF THE LETTER OF TRANSMITTAL,
   INCLUDING TAX CERTIFICATIONS (BOXES A, B, AND C).

   THE METHOD OF DELIVERY OF THE LETTER OF TRANSMITTAL AND ALL OTHER REQUIRED
   DOCUMENTS IS AT THE OPTION AND RISK OF THE TENDERING UNITHOLDER AND DELIVERY
   WILL BE DEEMED MADE ONLY WHEN ACTUALLY RECEIVED BY THE INFORMATION AGENT. IN
   ALL CASES, SUFFICIENT TIME SHOULD BE ALLOWED TO ASSURE TIMELY DELIVERY.

2.   SIGNATURE REQUIREMENTS.

   INDIVIDUAL AND JOINT OWNERS -- After carefully reading and completing the
   Letter of Transmittal, to tender Units, unitholders must sign at the "X" in
   the Signature Box of the Letter of Transmittal. The signature(s) must
   correspond exactly with the names printed (or corrected) on the front of the
   Letter of Transmittal. If the Letter of Transmittal is signed by the
   unitholder (or beneficial owner in the case of an IRA), no signature
   guarantee on the Letter of Transmittal is required. If any tendered Units are
   registered in the names of two or more joint owners, all such owners must
   sign this Letter of Transmittal.

   IRAS/ELIGIBLE INSTITUTIONS -- For Units held in an IRA account, the
   beneficial owner should sign in the Signature Box and no signature guarantee
   is required. Similarly, if Units are tendered for the account of a member
   firm of a registered national security exchange, a member firm of the
   National Association of Securities Dealers, Inc. or a commercial bank,
   savings bank, credit union, savings and loan association or trust company
   having an office, branch or agency in the United States (each an "Eligible
   Institution"), no signature guarantee is required.

   TRUSTEES, CORPORATIONS, PARTNERSHIP AND FIDUCIARIES -- Trustees, executors,
   administrators, guardians, attorneys-in-fact, officers of a corporation,
   authorized partners of a partnership or other persons acting in a fiduciary
   or representative capacity must sign at the "X" in the Signature Box and have
   their signatures guaranteed by an Eligible Institution by completing the
   signature guarantee set forth in the Signature Box of the Letter of
   Transmittal. If the Letter of Transmittal is signed by trustees,
   administrators, guardians, attorneys-in-fact, officers of a corporation,
   authorized partners of a partnership or others acting in a fiduciary or
   representative capacity, such persons should, in addition to having their
   signatures guaranteed, indicate their title in the Signature Box and must
   submit proper evidence satisfactory to the Purchaser of their authority to so
   act (see Instruction 3 below).

3.   DOCUMENTATION REQUIREMENTS. In addition to the information required to be
     completed on the Letter of Transmittal, additional documentation may be
     required by the Purchaser under certain circumstances including, but not
     limited to, those listed below. Questions on documentation should be
     directed to the Information Agent at its telephone number set forth herein.

   DECEASED OWNER (JOINT TENANT)      --    Copy of death certificate.

   DECEASED OWNER (OTHERS)            --    Copy of death certificate (see also
                                            Executor/Administrator/Guardian
                                            below).

   EXECUTOR/ADMINISTRATOR/GUARDIAN    --    Copy of court appointment documents
                                            for executor or administrator; and


                                       8
<PAGE>   9

                                           (a) a copy of applicable provisions
                                           of the will (title page, executor(s)'
                                           powers, asset distribution); or (b)
                                           estate distribution documents.

   ATTORNEY-IN-FACT                   --   Current power of attorney.

   CORPORATION/PARTNERSHIP            --   Corporate resolution(s) or other
                                           evidence of authority to act.
                                           Partnership should furnish a copy of
                                           the partnership agreement.

   TRUST/PENSION PLANS                --   Unless the trustee(s) are named in
                                           the registration, a copy of the cover
                                           page of the trust or pension plan,
                                           along with a copy of the section(s)
                                           setting forth names and powers of
                                           trustee(s) and any amendments to such
                                           sections or appointment of successor
                                           trustee(s).

4.   SPECIAL PAYMENT AND DELIVERY INSTRUCTIONS. If consideration is to be issued
     in the name of a person other than the person signing the Signature Box of
     the Letter of Transmittal or if consideration is to be sent to someone
     other than such signer or to an address other than that set forth on the
     Letter of Transmittal in the box entitled "Description of Units Tendered,"
     the appropriate boxes on the Letter of Transmittal should be completed.

5.   TAX CERTIFICATIONS. The unitholder(s) tendering Units to the Purchaser
     pursuant to the Offer must furnish the Purchaser with the unitholder(s)'
     taxpayer identification number ("TIN") and certify as true, under penalties
     of perjury, the representations in Box A, Box B and, if applicable, Box C.
     By signing the Signature Box, the unitholder(s) certifies that the TIN as
     printed (or corrected) on this Letter of Transmittal in the box entitled
     "Description of Units Tendered" and the representations made in Box A, Box
     B and, if applicable, Box C, are correct. See attached Guidelines for
     Certification of Taxpayer Identification Number on Substitute Form W-9 for
     guidance in determining the proper TIN to give the Purchaser.

   U.S. PERSONS. A unitholder that is a U.S. citizen or a resident alien
   individual, a domestic corporation, a domestic partnership, a domestic trust
   or a domestic estate (collectively, "U.S. Persons"), as those terms are
   defined in the Code, should follow the instructions below with respect to
   certifying Box A and Box B.

   BOX A - SUBSTITUTE FORM W-9.

   Part (i), Taxpayer Identification Number -- Tendering unitholders must
   certify to the Purchaser that the TIN as printed (or corrected) on this
   Letter of Transmittal in the box entitled "Description of Units Tendered" is
   correct. If a correct TIN is not provided, penalties may be imposed by the
   Internal Revenue Service (the "IRS"), in addition to the unitholder being
   subject to backup withholding.

   Part (ii), Backup Withholding -- In order to avoid 31% Federal income tax
   backup withholding, the tendering unitholder must certify, under penalty of
   perjury, that such unitholder is not subject to backup withholding. Certain
   unitholders (including, among others, all corporations and certain exempt
   non-profit organizations) are not subject to backup withholding. Backup
   withholding is not an additional tax. If withholding results in an
   overpayment of taxes, a refund may be obtained from the IRS. DO NOT CHECK THE
   BOX IN BOX A, PART (ii), UNLESS YOU HAVE BEEN NOTIFIED BY THE IRS THAT YOU
   ARE SUBJECT TO BACKUP WITHHOLDING.

   When determining the TIN to be furnished, please refer to the following as a
   guide:

   Individual accounts - should reflect owner's TIN.
   Joint accounts - should reflect the TIN of the owner whose name appears
      first.
   Trust accounts - should reflect the TIN assigned to the trust.
   IRA custodial accounts - should reflect the TIN of the custodian (not
      necessary to provide).
   Custodial accounts for the benefit of minors - should reflect the TIN of the
      minor.
   Corporations, partnership or other business entities - should reflect the
      TIN assigned to that entity.


                                       9
<PAGE>   10

   By signing the Signature Box, the unitholder(s) certifies that the TIN as
   printed (or corrected) on the front of the Letter of Transmittal is correct.

   BOX B - FIRPTA AFFIDAVIT -- Section 1445 of the Code requires that each
   unitholder transferring interests in a partnership with real estate assets
   meeting certain criteria certify under penalty of perjury the representations
   made in Box B, or be subject to withholding of tax equal to 10% of the
   purchase price for interests purchased. Tax withheld under Section 1445 of
   the Code is not an additional tax. If withholding results in an overpayment
   of tax, a refund may be obtained from the IRS. PART (i) SHOULD BE CHECKED
   ONLY IF THE TENDERING UNITHOLDER IS NOT A U.S. PERSON, AS DESCRIBED THEREIN.

   BOX C - FOREIGN PERSONS -- In order for a tendering unitholder who is a
   Foreign Person (i.e., not a U.S. Person, as defined above) to qualify as
   exempt from 31% backup withholding, such foreign Unitholder must certify,
   under penalties of perjury, the statement in Box C of this Letter of
   Transmittal, attesting to that Foreign Person's status by checking the box
   preceding such statement. UNLESS THE BOX IS CHECKED, SUCH UNITHOLDER WILL BE
   SUBJECT TO 31% WITHHOLDING OF TAX.

6.   VALIDITY OF LETTER OF TRANSMITTAL. All questions as to the validity, form,
     eligibility (including time of receipt) and acceptance of a Letter of
     Transmittal and other required documents will be determined by the
     Purchaser and such determination will be final and binding. The Purchaser's
     interpretation of the terms and conditions of the Offer (including these
     Instructions for this Letter of Transmittal) will be final and binding. The
     Purchaser will have the right to waive any irregularities or conditions as
     to the manner of tendering. Any irregularities in connection with tenders,
     unless waived, must be cured within such time as the Purchaser shall
     determine. This Letter of Transmittal will not be valid until any
     irregularities have been cured or waived. Neither the Purchaser nor the
     Information Agent are under any duty to give notification of defects in a
     Letter of Transmittal and will incur no liability for failure to give such
     notification.

7.   ASSIGNEE STATUS. Assignees must provide documentation to the Information
     Agent which demonstrates, to the satisfaction of the Purchaser, such
     person's status as an assignee.

8.   TRANSFER TAXES. The amount of any transfer taxes (whether imposed on the
     registered holder or such person) payable on account of the transfer to
     such person will be deducted from the purchase price unless satisfactory
     evidence of the payment of such taxes or exemption therefrom is submitted.

9.   MINIMUM TENDERS. A unitholder may tender any or all of his, her or its
     Units.

10.  CONDITIONAL TENDERS. No alternative, conditional or contingent tenders will
     be accepted.


                                       10
<PAGE>   11

             GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                          NUMBER ON SUBSTITUTE FORM W-9


     GUIDELINES FOR DETERMINING THE PROPER IDENTIFICATION NUMBER TO GIVE THE
PAYER -- Social Security numbers have nine digits separated by two hyphens:
i.e., 000-00-0000. Employer identification numbers have nine digits separated by
only one hyphen: i.e., 00-0000000. The table below will help determine the
number to give the payer.

<TABLE>
<CAPTION>
                                                           GIVE THE
                                                           TAXPAYER
                                                           IDENTIFICATION
FOR THIS TYPE OF ACCOUNT:                                  NUMBER OF - -
- ---------------------------------------------------------- -------------------------------------------------
<S>                                                        <C>

1.       An individual account                             The individual

2.       Two or more individuals (joint account)           The actual owner of the account or, if combined
                                                           funds, the first individual on the account

3.       Husband and wife (joint account)                  The actual owner of the account or, if joint funds,
                                                           either person

4.       Custodian account of a minor (Uniform Gift        The minor (2)
         to Minors Act)

5.       Adult and minor (joint account)                   The adult or, if the minor is the only contributor,
                                                           the minor (1)

6.       Account in the name of guardian or                The ward, minor or incompetent person (3)
         committee for a designated ward, minor or
         incompetent person (3)

7.    a. The usual revocable savings trust account         The grantor trustee (1)
         (grantor is also trustee)

      b. So-called trust account that is not a legal       The actual owner (1)
         or valid trust under state law

8.    Sole proprietorship account                          The owner (4)

9.    A valid trust, estate or pension trust               The legal entity (Do not furnish the
                                                           identifying number of the personal representative
                                                           or trustee unless the legal entity itself is not
                                                           designated in the account title.)(5)

10.   Corporate account                                    The corporation

11.   Religious, charitable, or educational                The organization
      organization account

12.   Partnership account held in the name of the          The partnership
      business

13.   Association, club, or other tax-exempt               The organization
      organization

14.   A broker or registered nominee                       The broker or nominee
</TABLE>


                                       11
<PAGE>   12

<TABLE>
<S>                                                        <C>

15.   Account with the Department of Agriculture           The public entity
      in the name of a public entity (such as a
      State or local government, school district,
      or prison) that receives agricultural program
      payments
</TABLE>

(1)  List first and circle the name of the person whose number you furnish.

(2)  Circle the minor's name and furnish the minor's social security number.

(3)  Circle the ward's or incompetent person's name and furnish such person's
     social security number or employer identification number.

(4)  Show your individual name. You may also enter your business name. You may
     use your social security number or employer identification number.

(5)  List first and circle the name of the legal trust, estate, or pension
     trust.

NOTE: If no name is circled when there is more than one name, the number will be
      considered to be that of the first name listed.


             GUIDELINES FOR CERTIFICATION OF TAXPAYER IDENTIFICATION
                          NUMBER ON SUBSTITUTE FORM W-9

     OBTAINING A NUMBER

     If you do not have a taxpayer identification number or you do not know your
number, obtain Form SS-5, Application for a Social Security Number Card (for
individuals), or Form SS-4, Application for Employer Identification Number (for
businesses and all other entities), at the local office of the Social Security
Administration or the Internal Revenue Service and apply for a number.

     PAYEES EXEMPT FROM BACKUP WITHHOLDING

     Payees specifically exempted from backup withholding on ALL payments
include the following:

     -    A corporation.
     -    A financial institution.
     -    An organization exempt from tax under section 501(a) of the Internal
          Revenue Code of 1986, as amended (the "Code"), or an individual
          retirement plan.
     -    The United States or any agency or instrumentality thereof.
     -    A State, the District of Columbia, a possession of the United States,
          or any subdivision or instrumentality thereof.
     -    A foreign government, a political subdivision of a foreign government,
          or any agency or instrumentality thereof.
     -    An international organization or any agency or instrumentality
          thereof.
     -    A registered dealer in securities or commodities registered in the
          U.S. or a possession of the U.S.
     -    A real estate investment trust.
     -    A common trust fund operated by a bank under section 584(a) of the
          Code.
     -    An exempt charitable remainder trust, or a non-exempt trust described
          in section 4947 (a)(1).
     -    An entity registered at all times under the Investment Company Act of
          1940.
     -    A foreign central bank of issue.
     -    A futures commission merchant registered with the Commodity Futures
          Trading Commission.

     Payments of dividends and patronage dividends not generally subject to
backup withholding include the following:

     -    Payments to nonresident aliens subject to withholding under section
          1441 of the Code.
     -    Payments to Partnerships not engaged in a trade or business in the
          U.S. and which have at least one nonresident partner.
     -    Payments of patronage dividends where the amount received is not paid
          in money.


                                       12
<PAGE>   13

     -    Payments made by certain foreign organizations.
     -    Payments made to an appropriate nominee.
     -    Section 404(k) payments made by an ESOP.

     Payments of interest not generally subject to backup withholding include
the following:

     -    Payments of interest on obligations issued by individuals.
          NOTE: You may be subject to backup withholding if this interest is
          $600 or more and is paid in the course of the payer's trade or
          business and you have not provided your correct taxpayer
          identification number to the payer. Payments of tax exempt interest
          (including exempt interest dividends under section 852 of the Code).
     -    Payments described in section 6049(b)(5) of the Code to nonresident
          aliens.
     -    Payments on tax-free covenant bonds under section 1451 of the Code.
     -    Payments made by certain foreign organizations.
     -    Payments of mortgage interest to you.
     -    Payments made to an appropriate nominee.

     Exempt payees described above should file a substitute Form W-9 to avoid
possible erroneous backup withholding. FILE THIS FORM WITH THE PAYER. FURNISH
YOUR TAXPAYER IDENTIFICATION NUMBER, WRITE "EXEMPT" ON THE FACE OF THE FORM, AND
RETURN IT TO THE PAYER. IF THE PAYMENTS ARE INTEREST, DIVIDENDS, OR PATRONAGE
DIVIDENDS, ALSO SIGN AND DATE THE FORM. IF YOU ARE A NONRESIDENT ALIEN OR A
FOREIGN ENTITY NOT SUBJECT TO BACKUP WITHHOLDING, FILE WITH PAYER A COMPLETED
INTERNAL REVENUE FORM W-8 (CERTIFICATE OF FOREIGN STATUS).

     Certain payments other than interest, dividends, and patronage dividends,
that are not subject to information reporting are also not subject to backup
withholding. For details, see the regulations under sections 6041, 6041A(A),
6045, and 6050A of the Code.

     PRIVACY ACT NOTICE -- Section 6109 of the Code requires most recipients of
dividend, interest, or other payments to give correct taxpayer identification
numbers to payers who must report the payments to the IRS. The IRS uses the
numbers for identification purposes. Payers must be given the numbers whether or
not recipients are required to file a tax return. Payers must generally withhold
31% of taxable interest, dividend, and certain other payments to a payee who
does not furnish a correct taxpayer identification number to a payer. Certain
penalties may also apply.

     PENALTIES

     (1) PENALTY FOR FAILURE TO FURNISH TAXPAYER IDENTIFICATION NUMBER -- If
you fail to furnish your correct taxpayer identification number to a payer, you
are subject to a penalty of $50 for each such failure unless your failure is due
to reasonable cause and not to willful neglect.

     (2) CIVIL PENALTY FOR FALSE INFORMATION WITH RESPECT TO WITHHOLDING -- If
you make a false statement with no reasonable basis that results in no
imposition of backup withholding, you are subject to a penalty of $500.

     (3) CRIMINAL PENALTY FOR FALSIFYING INFORMATION -- Willfully falsifying
certifications or affirmations may subject you to criminal penalties including
fines and/or imprisonment.

     FOR ADDITIONAL INFORMATION CONTACT YOUR TAX CONSULTANT OR THE INTERNAL
REVENUE SERVICE.


                                       13
<PAGE>   14

                     The Information Agent for the offer is:

                      RIVER OAKS PARTNERSHIP SERVICES, INC.

     By Mail:            By Overnight Courier:                 By Hand:
  P.O. Box 2065            111 Commerce Road              111 Commerce Road
S. Hackensack, N.J.      Carlstadt, N.J. 07072          Carlstadt, N.J. 07072
    07606-2065        Attn.: Reorganization Dept.    Attn.: Reorganization Dept.


                                  By Telephone:
                            TOLL FREE (888) 349-2005


                                       14

<PAGE>   1

                                                                EXHIBIT 99(a)(4)

                                 SUPPLEMENT TO
                              OFFER TO PURCHASE BY
                             AIMCO PROPERTIES, L.P.
            OF UP TO 168.14 UNITS OF LIMITED PARTNERSHIP INTEREST OF
                 RIVERSIDE PARK ASSOCIATES LIMITED PARTNERSHIP
                          FOR $19,000 PER UNIT IN CASH

        AIMCO PROPERTIES, L.P. HAS INCREASED ITS OFFER PRICE TO PURCHASE
             UNITS OF YOUR PARTNERSHIP TO $19,000 PER UNIT IN CASH

We will only accept a maximum of 168.14 units in response to our offer. If more
units are tendered to us, we will generally accept units on a pro rata basis
according to the number of units tendered by each person.

Our offer price will be reduced for any distributions made by your partnership
since the date of the Offer to Purchase and prior to the expiration of our
offer.

As extended, our offer and your withdrawal rights will rights expire at 5:00
p.m., New York City time, on July 13, 1999, unless we further extend the
deadline.

YOU WILL NOT PAY ANY FEES OR COMMISSIONS IF YOU TENDER YOUR UNITS.

Our offer is not subject to any minimum number of units being tendered


     SEE "RISK FACTORS" BEGINNING ON PAGE 1 OF THE OFFER TO PURCHASE AND ON PAGE
1 HEREIN FOR A DESCRIPTION OF RISK FACTORS THAT YOU SHOULD CONSIDER IN
CONNECTION WITH OUR OFFER, INCLUDING THE FOLLOWING:

     o   We determined the offer price of $19,000 per unit without any
         arms-length negotiations. Accordingly, our offer price may not reflect
         the fair market value of your units.

     o   Your general partner and the property manager of the residential
         property are affiliates of ours and, therefore, the general partner has
         substantial conflicts of interest with respect to our offer.

     o   We are making this offer with a view to making a profit and, therefore,
         there is a conflict between our desire to purchase your units at a low
         price and your desire to sell your units at a high price.

     o   Continuation of your partnership will result in our affiliates
         continuing to receive management fees from your partnership. Such fees
         would not be payable if your partnership was liquidated.

     o    It is possible that we may conduct a subsequent offer at a higher
          price.

     o   For any units that we acquire from you, you will not receive any future
         distributions from operating cash flow of your partnership or upon a
         sale or refinancing of property owned by your partnership.

     o   If we acquire a substantial number of units, we will increase our
         ability to influence voting decisions with respect to your partnership
         and may control such voting decisions, including but not limited to the
         removal of the general partner, most amendments to the partnership
         agreement and the sale of all or substantially all of your
         partnership's assets.

     If you desire to accept our offer, you should complete and sign the Letter
of Transmittal in accordance with the instructions thereto and mail or deliver
the signed Letter of Transmittal and any other required documents to River Oaks
Partnership Services, Inc., which is acting as Information Agent in connection
with our offer, at one of its addresses set forth on the back cover of this
Supplement. QUESTIONS AND REQUESTS FOR ASSISTANCE OR FOR ADDITIONAL COPIES OF
THE OFFER TO PURCHASE, THIS SUPPLEMENT OR THE LETTER OF TRANSMITTAL MAY ALSO BE
DIRECTED TO THE INFORMATION AGENT AT (888) 349-2005.

                                  June 29, 1999


<PAGE>   2


     We are offering to purchase up to 168.14 units, representing approximately
29.59% of the outstanding units of limited partnership interest in your
partnership, for the purchase price of $19,000 per unit, net to the seller in
cash, without interest, less the amount of distributions, if any, made by your
partnership in respect of any unit from May 13, 1999 until the expiration date.
Our offer is made upon the terms and subject to the conditions set forth in the
Offer to Purchase, dated May 13, 1999, this Supplement and in the accompanying
letter of transmittal.

     If you tender your units in response to our offer you will not be obligated
to pay any commissions or partnership transfer fees but will be obligated to pay
any transfer taxes (see Instruction 8 to the letter of transmittal). We have
retained River Oaks Partnership Services, Inc. to act as the Information Agent
in connection with our offer. We will pay all charges and expenses in connection
with the services of the Information Agent. The offer is not conditioned on any
minimum number of units being tendered. However, certain other conditions do
apply. See "The Offer Section 17. Conditions of the Offer" in the Offer to
Purchase.

     Our offer will expire at 5:00 P.M., New York City time, on July 13, 1999,
unless extended. We will pay for units tendered pursuant to the offer within ten
business day of our acceptance of such units for payment. If you desire to
accept our offer, you must complete and sign the letter of transmittal in
accordance with the instructions contained therein and forward or hand deliver
it, together with any other required documents, to the Information Agent. You
may withdraw your tender of units pursuant to the offer at any time prior to the
expiration date of our offer and, if we have not accepted such units for
payment, on or after July 11, 1999.

     On June 24, 1999, MP Income Fund 15, LLC; MP Income Fund 12, LLC;
Accelerated High Yield Institutional Investors, Ltd.; Accelerated High Yield
Institutional Fund, Ltd.; Moraga Fund 1, L.P.; and Moraga Gold, LLC commenced a
tender offer for 60 units at $18,000 per unit.

     On June 29, 1999, we raised our offer price from $12,786 to $19,000. Our
higher price will be paid for all units accepted for purchase regardless of when
the units are tendered, whether or not the units were tendered prior to the
increase in offer price.

                                      * * *

     Our Offer to Purchase is amended and supplemented as follows:

     1. The text under "Risk Factors-Recognition of Taxable Gain on Your Sale of
Your Units" set forth under "Risk Factors" of the Offer to Purchase is hereby
replaced in its entirety by inserting the following in lieu thereof:

     Your sale of units for cash will be a taxable sale, with the result that
you will recognize taxable gain or loss measured by the difference between the
amount realized on the sale and your adjusted tax basis in the units of limited
partnership interest of your partnership you transfer to us. The "amount
realized" with respect to a unit of limited partnership interest of your
partnership you transfer to us will be equal to the sum of the amount of cash
received by you for the unit sold pursuant to the offer plus the amount of
partnership liabilities allocable to the unit. The particular tax consequences
for you of our offer will depend upon a number of factors related to your tax
situation, including your tax basis in your units of limited partnership
interest of your partnership you transfer to us, whether you dispose of all of
your units and whether you have available suspended passive losses, credits or
other tax items to offset any gain recognized as a result of your sale of your
units of limited partnership interest of your partnership. Therefore, depending
on your basis in the units and your tax position, your taxable gain and any tax
liability resulting from a sale of units to us pursuant to the offer could
exceed our offer price. Because the income tax consequences of tendering units
will not be the same for everyone, you should consult your own tax advisor to
determine the tax consequences of the offer to you.

     2. The text under "Risk Factors-Possible Increase in Control of Your
Partnership by Us" is hereby replaced in its entirety by inserting the following
in lieu thereof:



                                       2
<PAGE>   3


     Decisions with respect to the day-to-day management of your partnership are
the responsibility of the general partner. Because the general partner of your
partnership is our affiliate, we control the management of your partnership.
Under your partnership's agreement of limited partnership, limited partners
holding a majority of the outstanding units must approve certain extraordinary
transactions, including the removal of the general partner, the addition of a
new general partner, most amendments to the partnership agreement and the sale
of all or substantially all of your partnership's assets. If we acquire all the
units we are tendering for we will own a majority of the outstanding units and
will have the ability to control any vote of the limited partners.

     3. The following is added as the fifth paragraph under "The Offer - Section
1. Terms of the Offer - Expiration Date; Proration:"

     Notwithstanding the above, if less than 168.14 units are validly tendered
and not properly withdrawn prior to the expiration date in accordance with the
procedures set forth in "The Offer-Section 4" and the purchase of all such units
would result in there being less than 320 unitholders, we will purchase only 99%
of the total number of units so tendered by each limited partner. By purchasing
only 99% of the units tendered by each limited partner, such limited partner
would continue to be a limited partner and received K-ls. See "The Offer-Section
7. Effects of the Offer-Effect on Trading Market; Registration Under 12(g) of
the Exchange Act."

     4. The first sentence under "The Offer - Section 5. Extension of Tender
Period; Termination; Amendment" is hereby amended to read as follows:

     We expressly reserve the right, in our reasonable discretion, at any time
and from time to time, (i) to extend the period of time during which our offer
is open and thereby delay acceptance for payment of, and payment for, any unit,
(ii) to terminate the offer and not accept any units not theretofore accepted
for payment or paid for if any of the conditions to the offer are not satisfied
or if any event occurs that might reasonably be expected to result in a failure
to satisfy such conditions, (iii) upon the occurrence of any of the conditions
specified in "The Offer - Section 17," to delay the acceptance for payment of,
or payment for, any units not already accepted for payment or paid for, and (iv)
to amend our offer in any respect (including, without limitation, by increasing
the consideration offered, increasing or decreasing the units being sought, or
both).

     5. The last sentence of the second paragraph under "The Offer-Section 7.
Effects of the Offer-Effect on Trading Market; Registration Under Section 12(g)
of the Exchange Act of 1934" is hereby amended to read as follows:

         Your partnership currently has 666 unitholders of record. While we
believe that, even if we purchase the maximum number of units pursuant to the
offer, the units will be held by more than 300 persons. If units are tendered
which would result in less than 320 unitholders, we will purchase no more than
99% of the units tendered by each unitholder. See "The Offer-Section 1. Terms of
the Offer; Expiration Date; Proration."

     6. The second paragraph under "The Offer - Section 9. Background and
Reasons for the Offer - Alternatives Considered by Your General Partner -
Liquidation" is hereby amended to read as follows:

     However, in the opinion of your general partner (which is our subsidiary),
the present time may not be the most desirable time to sell the residential real
estate assets of your partnership in a private transaction, and the proceeds
realized from any such sale would be uncertain. Your general partner believes it
currently is in the best interest of your partnership to continue holding its
residential real estate assets. Although there might be a prepayment penalty of
approximately 1 to 2% of the outstanding balance of the mortgage depending on
when and under what circumstances it is prepaid, such prepayment penalty is not
a significant factor in determining when the property may be sold. See "The
Offer - Section 13. Certain Information Concerning Your Partnership - Investment
Objectives and Policies; Sale or Financing of Investments."


                                       3
<PAGE>   4


     7. The text under "The Offer - Section 9. Background and Reasons for the
Offer - Comparison of Consideration to Alternative Consideration-Prices on
Secondary Market" is hereby replaced in its entirety by inserting the following
in lieu thereof:

     Secondary market sales information is not a reliable measure of value
because of the lack of any known trades. At present, privately negotiated sales
and sales through intermediaries are the only means which may be available to a
limited partner to liquidate an investment in units (other than our offer)
because the units are not listed or traded on any exchange or quoted on NASDAQ,
on the Electronic Bulletin Board, or in "pink sheets." Secondary sales activity
for the units, including privately negotiated sales, has been limited and
sporadic.

     According to information obtained from your general partner relating to the
ownership of units in your partnership, no sales of partnership units occurred
from January 1, 1996 to March 31, 1999.

     The Partnership Spectrum, which is an independent, third-party source of
information regarding sales of partnership units, reported no sales of your
partnership units for the years ended December 31, 1996, 1997 and 1998 or for
the first two months of 1999. The American Partnership Board, which is an
independent, third-party source of information regarding sales of partnership
units, reported no sales of your partnership units for the year ended December
31, 1998, the first quarter of 1999 or the two months ended May 31, 1999.

     8. The text under "The Offer - Section 10. Position of the General Partner
of Your Partnership with Respect to the Offer" is hereby replaced in its
entirety by inserting the following in lieu thereof:

     The general partner of your partnership believes the offer price and the
structure of the transaction are fair to the limited partners. In making such
determination, the general partner considered all of the factors and information
set forth below, but did not quantify or otherwise attach particular weight to
any such factors or information:

     o    The offer gives you an opportunity to make an individual decision on
          whether to tender your units or to continue to hold them.

     o    Our offer price, and the method we used to determine our offer price.

     o    The fact that the price offered for your units is based on an
          estimated value of your partnership's properties that has been
          determined using a method believed to reflect the valuation of such
          assets by buyers in the market for similar assets.

     o    Prices at which the units have recently sold, to the extent such
          information is available.

     o    The absence of an established trading market for your units.

     o    An analysis of possible alternative transactions, including a property
          sale or refinancing, or a liquidation of the partnership.

     o    An evaluation of the financial condition and results of operations of
          your partnership including the increase in property income of your
          partnership from a loss of $1,003,000 for the year ended December 31,
          1997 to a loss of $1,094,000 for the year ended December 31, 1998.

     o    The tender offer filed on June 24, 1999 by MP Income Fund 15, LLC, MP
          Income Fund 12, LLC, Accelerated High Yield Institutional Investors,
          Ltd., Accelerated High Yield Institutional Fund, Ltd., Moraga Fund 1,
          L.P., and Moraga Gold, LLC for only 60 units at $18,000 per unit,
          which is at a lower price and for less units than our offer.



                                       4
<PAGE>   5


     The general partner of your partnership makes no recommendation as to
whether you should tender or refrain from tendering your units. Although the
general partner believes the offer is fair, you must make your own decision
whether or not to participate in the offer, based upon a number of factors,
including your financial position, your need or desire for liquidity, other
financial opportunities available to you, and your tax position and the tax
consequences to you of selling your units.

     The general partner is not taking a position as to whether or not you
should tender units in connection with offer by MP Income Fund 15, LLC, MP
income Fund 12, LLC, Accelerated High Yield Institutional Investors, Ltd.,
Accelerated High Yield Institutional Fund Ltd., Moraga Fund 1, L.P., and Moraga
Gold, LLC, since it believes that each limited partner must make its own
decision based upon the factors set forth above. However, the general partner
notes that such offer is for a lower price and for less units than our offer.

     9. The text under "The Offer - Section 14. Voting Power" is hereby replaced
in its entirety by inserting the following in lieu thereof:

     Decisions with respect to the day-to-day management of your partnership are
the responsibility of the general partner. Because the general partner of your
partnership is our affiliate, we control the management of your partnership.
Under your partnership's agreement of limited partnership, limited partners
holding a majority of the outstanding units must approve certain extraordinary
transactions, including the removal of the general partner, the addition of a
new general partner, most amendments to the partnership agreement and the sale
of all or substantially all of your partnership's assets. If we acquire all the
units we are offering to purchase, we will own a majority of the outstanding
units and will have the ability to control any vote of the limited partners.

     10. The text under "The Offer -- Section 15. Source of Funds" is hereby
replaced in its entirety by inserting the following in lieu thereof:

     We expect that approximately $3,194,660 will be required to purchase all of
the 168.14 limited partnership units that we are seeking in this offer
(exclusive of fees and expenses estimated to be $12,000). For more information
regarding fees and expenses, see "The Offer --Section 19. Fees and Expenses" in
the Offer to Purchase.

     In addition to this offer, we are concurrently making offers to acquire
interests in approximately 100 other limited partnerships. If all such offers
were fully subscribed for cash, we would be required to pay approximately $260
million for all such units. If for some reason we did not have such funds
available we might extend this offer for a period of time sufficient for us to
obtain additional funds, or we might terminate this offer. However, based on our
past experience with similar offers, we do not expect all such offers to be
fully subscribed. Also, in some offers, investors have been offered a choice of
cash or securities. As a result, we expect that the funds that will be necessary
to consummate all the offers will be substantially less than $200 million. We
believe that we have sufficient cash on hand and available sources of financing
to pay such amounts. As of March 31, 1999, we had $38,000,000 of cash on hand
and $145,000,000 available for borrowing under our existing lines of credit.

     Under our $145 million revolving credit facility with Bank of America
National Trust and Savings Association ("Bank of America") and BankBoston, N.A.,
AIMCO Properties, L.P. is the borrower and all obligations thereunder are
guaranteed by AIMCO and certain of its subsidiaries. The annual interest rate
under the credit facility is based on either LIBOR or Bank of America's
reference rate, at our election, plus, an applicable margin. We elect which
interest rate will be applicable to particular borrowings under the credit
facility. The margin ranges between 2.25% and 2.75% in the case of LIBOR-based
loans and between 0.75% and 1.25% in the case of base rate loans, depending upon
a ratio of our consolidated unsecured indebtedness to the value of certain
unencumbered assets. The credit facility matures on September 30, 1999 unless
extended, at the discretion of the lenders. The credit facility provides for the
conversion of the revolving facility into a three year term loan. The
availability of funds to us under the credit facility is subject to certain
borrowing base restrictions and other customary restrictions, including
compliance with financial and other covenants thereunder. The financial
covenants require us to maintain a ratio of



                                       5
<PAGE>   6

debt to gross asset value of no more than 0.55 to 1.0, an interest coverage
ratio of 2.25 to 1.0 and a fixed charge coverage ratio of at least 1.7 to 1.0
from January 1, 1999 through June 30, 1999, and 1.8 to 1.0 thereafter. In
addition, the credit facility limits us from distributing more than 80% of our
Funds From Operations (as defined) to holders of our units, imposes minimum net
worth requirements and provides other financial covenants related to certain
unencumbered assets.


                                       6
<PAGE>   7

     The letter of transmittal and any other required documents should be sent
or delivered by each unitholder or such unitholder's broker, dealer, bank, trust
company or other nominee to the Information Agent at one of its addresses set
forth below.


                     THE INFORMATION AGENT FOR THE OFFER IS:

                      RIVER OAKS PARTNERSHIP SERVICES, INC.

<TABLE>
<CAPTION>
                By Mail:                         By Overnight Courier:                        By Hand:
<S>                                        <C>                                       <C>
             P.O. Box 2065                         111 Commerce Road                      111 Commerce Road
     S. Hackensack, N.J. 07606-2065              Carlstadt, N.J. 07072                  Carlstadt, N.J. 07072
                                              Attn.: Reorganization Dept.            Attn.: Reorganization Dept.

                                           For information, please call:

                                             TOLL FREE: (888) 349-2005
</TABLE>

<PAGE>   1
                                                                EXHIBIT 99(a)(5)

                      [AIMCO PROPERTIES, L.P. LETTERHEAD]

                                 June 29, 1999

Dear Limited Partner,

         AIMCO Properties, L.P. has increased its offer price to acquire 168.14
units of Riverside Park Associates Limited Partnership (the "Partnership") to
$19,000 per unit. Our price increase is effective immediately and will apply to
all units tendered pursuant to our offer. You may receive from a group of real
estate partnership investors an offer to purchase up to 60 units of limited
partnership interest at $18,000 per unit.

         You should note that our offer is at a higher price and for more units
than the other offer. Under our offer, because we are attempting to purchase
more units than the other offer, there is a greater likelihood that all of your
tendered units will be purchased by us and not returned to you unpurchased as a
result of proration. Accordingly, if we acquired all of your units, you would
no longer receive Schedule K-1s for tax reporting purposes as a limited partner
of the Partnership.

         Our offer will expire on July 13, 1999 while the other offer expires on
July 29, 1999, so if you tender to us, you would receive cash for your units
earlier and at a higher price than under the other offer.

         If you have already tendered your units pursuant to our offer, you will
automatically receive the higher offer price if your units are accepted for
payment. If you have not already sent in your Letter of Transmittal, you should
complete and sign the enclosed Letter of Transmittal in accordance with the
instructions thereto and mail or deliver the signed Letter of Transmittal and
any other required documents to River Oaks Partnership Services, Inc., which is
acting as Information Agent in connection with our offer, at one of its
addresses set forth on the back cover of the attached Supplement. QUESTIONS AND
REQUESTS FOR ASSISTANCE OR FOR ADDITIONAL COPIES OF THE OFFER TO PURCHASE, THE
SUPPLEMENT OR THE LETTER OF TRANSMITTAL MAY ALSO BE DIRECTED TO THE INFORMATION
AGENT AT (888) 349-2005.

                                                Sincerely,


                                                AIMCO PROPERTIES, L.P.


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