SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                   ----------

                                  SCHEDULE TO/A

                                 (Rule 14d-100)
            TENDER OFFER STATEMENT UNDER SECTION 14(d)(1) OR 13(e)(1)
                     OF THE SECURITIES EXCHANGE ACT OF 1934

                                (Amendment No. 1)

                        REAL ESTATE ASSOCIATES LIMITED IV
- --------------------------------------------------------------------------------
                       (Name of Subject Company (Issuer))

                        AIMCO PROPERTIES, L.P. - OFFEROR
- --------------------------------------------------------------------------------
            (Names of Filing Persons (Identifying Status as Offeror,
                            Issuer or Other Person)

                            LIMITED PARTNERSHIP UNITS
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                      NONE
- --------------------------------------------------------------------------------
                      (CUSIP Number of Class of Securities)

                                 Patrick J. Foye
                            Executive Vice President
                   Apartment Investment and Management Company
                           Colorado Center, Tower Two
                   2000 South Colorado Boulevard, Suite 2-1000
                             Denver, Colorado 80222
                                 (303) 757-8081
- --------------------------------------------------------------------------------
                  (Name Address and Telephone Number of Person
  Authorized to Receive Notices and Communications on Behalf of Filing Persons)

                                    Copy To:
                                Gregory M. Chait
                                  Robert Barker
                     Powell, Goldstein, Frazer & Murphy LLP
                   191 Peachtree Street, N.E., Sixteenth Floor
                             Atlanta, Georgia 30303
                                 (404) 572-6600

                            CALCULATION OF FILING FEE

<Table>
<Caption>
  Transaction Valuation*                                Amount of Filing Fee**
  ----------------------                                ----------------------
                                                     
       $1,069,250                                              $98.37
</Table>

*        For purposes of calculating the fee only.

**       Previously paid.

[ ]      Check the 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.

<Table>
                                                         
         Amount Previously Paid:                            Filing Party:
                                -----------------------                  ---------------------
         Form or Registration No.:                          Date Filed:
                                  ---------------------                -----------------------
</Table>

[ ]      Check the box if the filing relates solely to preliminary
         communications made before the commencement of a tender offer.



         Check the appropriate boxes below to designate any transactions to
which the statement relates:

<Table>
                                                                     
          [X]  third-party tender offer subject to Rule 14d-1.          [ ]  going-private transaction subject to Rule 13e-3.

          [ ]  issuer tender offer subject to Rule 13e-4.               [ ]  amendment to Schedule 13D under Rule 13d-2.
</Table>

         Check the following box if the filing is a final amendment reporting
the results of the tender offer: [ ]



                                       2







                             TENDER OFFER STATEMENT

         This amendment amends the Tender Offer Statement on Schedule TO filed
by AIMCO Properties, L.P., a Delaware limited partnership ("AIMCO Properties"),
in connection with its tender offer to purchase outstanding units of limited
partnership interest of Real Estate Associates Limited IV, a California limited
partnership, at a price of $325.00 per unit in cash, subject to the conditions
set forth in the Offer to Purchase, dated August 19, 2002 (the "Offer to
Purchase"), and in the related Letter of Transmittal and Acknowledgment and
Agreement, which, as amended and supplemented from time to time, together
constitute the tender offer. Copies of the Offer to Purchase, Letter of
Transmittal and Acknowledgment and Agreement are filed with this Schedule TO as
Exhibits (a)(1), (a)(2) and (a)(3), respectively. The item numbers and responses
thereto below are in accordance with the requirements of Schedule TO.

ITEM 1. SUMMARY TERM SHEET.

         The information set forth under "Summary Term Sheet" in the Offer to
Purchase is incorporated herein by reference.

         The bullet point entitled "No General Partner Recommendation" is hereby
replaced in its entirety with the following:

         o        NO GENERAL PARTNER RECOMMENDATION. The general partner makes
                  no recommendation as to whether you should tender or refrain
                  from tendering your units, and each limited partner should
                  make his or her own decision whether or not to tender. See
                  "The Offer--Section 10. Position of the General Partner of
                  your Partnership with respect to the Offer." But your
                  partnership is the limited partner of the Local Partnerships,
                  and as a result does not control the management of the Local
                  Partnerships, your general partner does not have the ability
                  to cause the Local Partnerships to sell all or substantially
                  all of the Properties. Moreover, to the extent that your
                  general partner could cause such a sale, at this time your
                  general partner does not believe that selling all or
                  substantially all of the Properties or liquidating the
                  partnership would be in the best interest of the unitholders.
                  See "The Offer--Section 9. Background and Reasons for the
                  Offer."

ITEM 2. SUBJECT COMPANY INFORMATION.

         (a) - (c) The information set forth under "THE OFFER--Section 13.
Certain Information Concerning Your Partnership" in the Offer to Purchase is
incorporated herein by reference.

ITEM 3. IDENTITY AND BACKGROUND OF FILING PERSON.

         (a) - (c) This Schedule TO is being filed by AIMCO Properties.
AIMCO-GP, Inc., a Delaware corporation ("AIMCO-GP"), is the general partner of
AIMCO Properties and a wholly owned subsidiary of Apartment Investment and
Management Company ("AIMCO"). The principal business of AIMCO, AIMCO-GP and
AIMCO Properties is the ownership, acquisition,



                                       1



development, expansion and management of multi-family apartment properties. The
business address of AIMCO Properties is 2000 South Colorado Boulevard, Suite
2-1000, Denver, Colorado 80222, and its telephone number is (303) 757-8101.

         The information set forth under "THE OFFER--Section 8. Information
Concerning Us and Certain of Our Affiliates" in the Offer to Purchase is
incorporated herein by reference.

         During the past five years, none of AIMCO, AIMCO-GP or AIMCO
Properties, nor, to the best of their knowledge, any of the persons listed in
Annex I to the Offer to Purchase (i) has been convicted in a criminal proceeding
(excluding traffic violations or similar misdemeanors) or (ii) was a party to a
civil proceeding of a judicial or administrative body of competent jurisdiction
and as a result of such proceeding was or is subject to a judgment, decree or
final order enjoining future violations of, or prohibiting activities subject
to, federal or state securities laws, or finding any violation with respect to
such laws.

ITEM 4. TERMS OF THE TRANSACTION.

         (a) The information set forth under "SUMMARY TERM SHEET" and "THE
OFFER" in the Offer to Purchase and the information set forth in the related
Letter of Transmittal is incorporated herein by reference.

         AIMCO Properties is seeking to acquire the maximum amount of units
allowed to be purchased under the partnership agreement, given its prohibition
on transferring units that exceed 50% of all transfers during the preceding
twelve months. Approximately 2.8% of the units of the partnership have been
transferred in the preceding 12 months.

         The subsection entitled "Determination of Validity; Rejection of Units;
Waiver of Defects; No Obligation to Give Notice of Defects" in Section 3.
Procedure for Tendering Units is hereby replaced in its entirety by the
following:

          All questions as to the validity, form, eligibility (including time of
          receipt) and acceptance for payment of any tender of units pursuant to
          our offer will be determined by us, in our reasonable discretion,
          which determination shall be final and binding on all parties. We
          reserve the absolute right to reject any or all tenders of any
          particular unit determined by us not to be in proper form or if the
          acceptance of or payment for that unit may, in the opinion of our
          counsel, be unlawful. We also reserve the absolute right to waive any
          defect or irregularity in any tender with respect to any particular
          unit of any particular limited partner, and to waive or amend any of
          the conditions of the offer that we are legally permitted to waive as
          to the tender of any particular unit, provided that if we waive any
          condition with respect to one unit, we will waive such condition as to
          all units. Our interpretation of the terms and conditions of the offer
          (including the acknowledgment and agreement and the letter of
          transmittal) will be final and binding on all parties. No tender of
          units will be deemed to have been validly made unless and until all
          defects and irregularities have been cured or waived.



                                       2



         Neither we, the Information Agent, nor any other person will be under
         any duty to give notification of any defects or irregularities in the
         tender of any unit or will incur any liability for failure to give any
         such notification.

         The fifth bullet point under "The Offer - Section 13. Conditions of the
Offer" is hereby modified in its entirety to read:

         o        your partnership shall have, due to events beyond our direct
                  or indirect control, (i) changed, or authorized a change of,
                  the units or your partnership's capitalization, (ii) issued,
                  distributed, sold or pledged, or authorized, proposed or
                  announced the issuance, distribution, sale or pledge of (A)
                  any equity interests (including, without limitation, units),
                  or securities convertible into any such equity interests or
                  any rights, warrants or options to acquire any such equity
                  interests or convertible securities, or (B) any other
                  securities in respect of, in lieu of, or in substitution for
                  units outstanding on the date hereof, (iii) purchased or
                  otherwise acquired, or proposed or offered to purchase or
                  otherwise acquire, any outstanding units or other securities,
                  (iv) declared or paid any dividend or distribution on any
                  units or issued, authorized, recommended or proposed the
                  issuance of any other distribution in respect of the units,
                  whether payable in cash, securities or other property, (v)
                  authorized, recommended, proposed or announced an agreement,
                  or intention to enter into an agreement, with respect to any
                  merger, consolidation, liquidation or business combination,
                  any acquisition or disposition of a material amount of assets
                  or securities, or any release or relinquishment of any
                  material contract rights, or any comparable event, not in the
                  ordinary course of business, (vi) taken any action to
                  implement such a transaction previously authorized,
                  recommended, proposed or publicly announced, (vii) issued, or
                  announced its intention to issue, any debt securities, or
                  securities convertible into, or rights, warrants or options to
                  acquire, any debt securities, or incurred, or announced its
                  intention to incur, any debt other than in the ordinary course
                  of business and consistent with past practice, (viii)
                  authorized, recommended or proposed, or entered into, any
                  transaction which, in our reasonable judgment, has or could
                  have an adverse affect on the value of your partnership or the
                  units, (ix) proposed, adopted or authorized any amendment of
                  its organizational documents, (x) agreed in writing or
                  otherwise to take any of the foregoing actions or (xi) been
                  notified that any debt of your partnership or any of its
                  subsidiaries secured by any of its or their assets is in
                  default or has been accelerated;

ITEM 5. PAST CONTACTS, TRANSACTIONS, NEGOTIATIONS AND AGREEMENTS.

         (a) and (b) The information set forth under "SUMMARY TERM
SHEET--Conflicts of Interest," "THE OFFER--Section 9. Background and Reasons for
the Offer" and "THE OFFER--Section 11. Conflicts of Interest and Transactions
with Affiliates" in the Offer to Purchase is incorporated herein by reference.



                                       3



ITEM 6. PURPOSES OF THE TRANSACTION AND PLANS OR PROPOSALS.

         (a), (c)(1) - (7) The information set forth under "SUMMARY TERM
SHEET--The Offer, "THE OFFER--Section 9. Background and Reasons for the Offer"
and "The Offer--Section 12. Future Plans of the Purchaser" in the Offer to
Purchase is incorporated herein by reference.

ITEM 7. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         (a), (b) and (d) The information set forth under "SUMMARY TERM
SHEET--Availability of Funds," "THE OFFER--Section 15. Source of Funds" and "THE
OFFER--Section 19. Fees and Expenses" in the Offer to Purchase is incorporated
herein by reference.

ITEM 8. INTEREST IN SECURITIES OF THE SUBJECT COMPANY.

         The information set forth under "THE OFFER--Certain Information
Concerning Your Partnership" in the Offer to Purchase is incorporated herein by
reference.

ITEM 9. PERSONS/ASSETS, RETAINED, EMPLOYED, COMPENSATED OR USED.

         The information set forth under "THE OFFER--Section 19. Fees and
Expenses" in the Offer to Purchase is incorporated herein by reference.

ITEM 10. FINANCIAL STATEMENTS.

         (a) The financial statements included in AIMCO Properties' Annual
Report on Form 10-K for the year ended December 31, 2001, which are listed on
the Index to Financial Statements on page F-1 of such report, and the unaudited
financial statements for the six months ended June 30, 2002 and June 30, 2001
set forth in Part I, Item 1 of AIMCO Properties' Quarterly Report on Form 10-Q
for the quarter ended June 30, 2002, are incorporated herein by reference. Such
reports may be inspected at the Securities and Exchange Commission's public
reference room in Washington, D.C. A copy can also be obtained from the
Commission's web site at www.sec.gov.

         (b)  Not Applicable.

ITEM 11. ADDITIONAL INFORMATION.

         The information set forth in the Offer to Purchase and in the related
Letter of Transmittal is incorporated herein by reference.

         The Risk Factor entitled "You may be unable to transfer your units for
a 12-month period" is hereby replaced in its entirety by the following:

         Your partnership's agreement of limited partnership prohibits any
         transfer of an interest if such transfer, together with all other
         transfers during the preceding 12



                                       4



         months, would cause 50% or more of the total interest in capital and
         profits of your partnership to be transferred within such 12-month
         period. During the last 12 months, approximately 2.8% of the total
         interest in capital and profits of your partnership has been
         transferred. If more units are validly tendered and not withdrawn, that
         would cause more than 50% of the total interest in capital and profits
         of your partnership to be transferred within a 12-month period, we will
         accept for payment and pay for those units so tendered pro rata
         according to the number of units so tendered, with appropriate
         adjustments to avoid purchases of fractional units. If we acquire a
         significant percentage of the interest in your partnership, you may not
         be able to transfer your units for a 12-month period following our
         offer.

         The Risk Factor entitled "Continuation of the partnership; no time
frame regarding sale of partnership interests" is hereby supplemented by adding
the following new paragraph as the second paragraph:

         If the partnership liquidated before the Local Partnerships liquidated,
         the general partner is of the opinion that the distribution of limited
         partnership interests held by the partnership would decrease the
         benefits of holding a portfolio of different properties, and could
         increase expenses of ownership of the Local Partnerships, for example,
         by causing the Local Partnerships to be held directly by the limited
         partners, with separate reporting obligations, including potential
         reporting obligations with the Securities and Exchange Commission. The
         general partner has concluded that it would be neither feasible nor in
         the limited partners' best interest to force the liquidation of the
         partnership.

         "Section 9. Background and Reasons for the Offer - Alternatives
Considered by your General Partner" is hereby supplemented by adding the same
paragraph listed above.

         The Selected Financial Information contained in "Section 13. Certain
Information Concerning Your Partnership - Financial Date" is replaced with the
following:

         FINANCIAL DATA. The selected financial information of your partnership
set forth below for the years ended December 31, 2001 and 2000 is based on
audited financial statements. The selected financial information set forth below
for the six months ended June 30, 2002 and 2001 is based on unaudited financial
statements. This information should be read in conjunction with such financial
statements, including notes thereto, and "Management's Discussion and Analysis
of Financial Condition and Results of Operations of Your Partnership" in the
Annual Report on Form 10-K405 of your partnership for the year ended December
31, 2001, and the Quarterly Report on Form 10-Q for the quarter ended June 30,
2002.



                                       5






                        REAL ESTATE ASSOCIATES LIMITED IV
                      (IN THOUSANDS, EXCEPT PER UNIT DATA)

<Table>
<Caption>
                                                                  FOR THE YEAR ENDED           FOR THE SIX MONTHS
                                                                      DECEMBER 31,               ENDED JUNE 30,
                                                                -----------------------     -----------------------
                                                                  2001          2000          2002          2001
                                                                ---------     ---------     ---------     ---------
                                                                                              

Operating Data:

Total Revenues                                                  $     193     $     292     $      41     $     112
Net Income (Loss)                                                     (59)            3           (77)           27
Net Income per limited partnership unit                                10            14            (6)            2
Distributions per limited partnership unit                             --            --            --            --

Balance Sheet Data:

Cash & Cash Equivalents                                             5,476         5,328         5,460         5,353
Real Estate, Net of Accumulated Depreciation                           --            --            --            --
Total Assets                                                        5,498         5,328         5,493         5,353
Notes Payable                                                          --            --            --            --
General Partners' Capital (Deficit)                                  (218)         (219)         (218)         (219)
Limited Partners' Capital (Deficit)                                 5,660         5,532         5,583         5,559
Partners' Capital (Deficit)                                         5,442         5,313         5,365         5,340
Total Distributions                                                    --            --            --            --
Net increase (decrease) in cash and cash equivalents                  148           159           (16)           25
Net cash provided by operating activities                       $     170     $     159     $     (53)    $      25
</Table>

ITEM 12. EXHIBITS.

(a)(1)   Offer to Purchase limited partnership units of Real Estate Associates
         Limited IV, dated August 19, 2002. (Previously filed)

(a)(2)   Letter of Transmittal and related instructions, dated August 19, 2002
         (included as Annex II to the Offer to Purchase attached as Exhibit
         (a)(1)).

(a)(3)   Acknowledgement and Agreement, dated August 19, 2002. (Previously
         filed)

(a)(4)   Letter, dated August 19, 2002, from AIMCO Properties to the limited
         partners of Real Estate Associates Limited IV. (Previously filed)

(a)(5)   Annual Report of AIMCO Properties for the year ended December 31, 2001
         filed on Form 10-K405 on April 1, 2002 is incorporated herein by
         reference.

(a)(6)   Quarterly Report of AIMCO Properties for the period ended June 30, 2002
         filed on Form 10-Q on August 14, 2002 is incorporated herein by
         reference.



                                       6



(b)(1)   Fourth Amended and Restated Credit Agreement, dated as of March 11,
         2002, by and among AIMCO Properties, AIMCO/Bethesda Holdings, Inc., NHP
         Management Company, Bank of America, N.A., Fleet National Bank, First
         Union National Bank, and the other financial institutions party thereto
         (Exhibit 10.29 to AIMCO's Annual Report on Form 10-K for the year ended
         December 31, 2001 is incorporated herein by reference).

(b)(2)   Second Amendment to Fourth Amended and Restated Credit Agreement, dated
         as of August 2, 2002, by and among Apartment Investment and Management
         Company, AIMCO Properties, L.P., AIMCO/Bethesda Holdings, Inc., NHP
         Management Company, Bank of America, N.A. and the Lenders listed
         therein (Exhibit 10.2 to AIMCO's Quarterly Report on Form 10-Q for the
         quarterly period ended June 30, 2002 is incorporated herein by
         reference).

(d)      Not applicable

(g)      None.

(h)      None.

ITEM 13. INFORMATION REQUIRED BY SCHEDULE 13E-3.

         Not Applicable.



                                       7




                                    SIGNATURE

         After due inquiry and to the best of its knowledge and belief, the
undersigned hereby certifies that the information set forth in this statement is
true, complete and correct.

Dated: September 5, 2002
                                               AIMCO PROPERTIES, L.P.

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

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



                                       8








                                  EXHIBIT INDEX


<Table>
<Caption>
EXHIBIT NO.                DESCRIPTION
- -----------                -----------
                        
(a)(1)                     Offer to Purchase limited partnership units of Real
                           Estate Associates Limited IV, dated August 19, 2002.
                           (Previously filed)

(a)(2)                     Letter of Transmittal and related instructions, dated
                           August 19, 2002 (included as Annex II to the Offer to
                           Purchase attached as Exhibit (a)(1)).

(a)(3)                     Acknowledgement and Agreement, dated August 19, 2002.
                           (Previously filed)

(a)(4)                     Letter, dated August 19, 2002, from AIMCO Properties
                           to the limited partners of Real Estate Associates
                           Limited IV. (Previously filed)

(a)(5)                     Annual Report of AIMCO Properties for the year ended
                           December 31, 2001 filed on Form 10-K405 on April 1,
                           2002 is incorporated herein by reference.

(a)(6)                     Quarterly Report of AIMCO Properties for the period
                           ended June 30, 2002 filed on Form 10-Q on August 14,
                           2002 is incorporated herein by reference.

(b)(1)                     Fourth Amended and Restated Credit Agreement, dated
                           as of March 11, 2002, by and among AIMCO Properties,
                           AIMCO/Bethesda Holdings, Inc., NHP Management
                           Company, Bank of America, N.A., Fleet National Bank,
                           First Union National Bank, and the other financial
                           institutions party thereto (Exhibit 10.29 to AIMCO's
                           Annual Report on Form 10-K for the year ended
                           December 31, 2001 is incorporated herein by
                           reference).

(b)(2)                     Second Amendment to Fourth Amended and Restated
                           Credit Agreement, dated as of August 2, 2002, by and
                           among Apartment Investment and Management Company,
                           AIMCO Properties, L.P., AIMCO/Bethesda Holdings,
                           Inc., NHP Management Company, Bank of America, N.A.
                           and the Lenders listed therein (Exhibit 10.2 to
                           AIMCO's Quarterly Report on Form 10-Q for the
                           quarterly period ended June 30, 2002 is incorporated
                           herein by reference).

(e)                        Not applicable

(i)                        None.

(j)                        None.
</Table>