1 SECURITIES AND EXCHANGE COMMISSION WASHINGTON, DC 20549 SCHEDULE TO TENDER OFFER STATEMENT UNDER SECTION 14(d)(1) OR 13(e)(1) OF THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. 3) (FINAL AMENDMENT) AND SCHEDULE 13D UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. 20) National Property Investors 4 ----------------------------- (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 Securities) None ---- (CUSIP Number of Class Securities) Patrick J. Foye Apartment Investment And Management Company Colorado Center, Tower Two 2000 South Colorado Boulevard, Suite 2-1000 Denver, Colorado 80222 (303) 757-8101 (Name, address, and telephone numbers of person authorized to receive notices and communications on behalf of filing persons) Copy To: Jonathan L. Friedman Skadden, Arps, Slate, Meagher & Flom LLP 300 South Grand Avenue, 34th Floor Los Angeles, California 90071 (213) 687-5000 2 Calculation of Filing Fee Transaction valuation* Amount of filing fee $4,553,342 $910.67 * For purposes of calculating the fee only. This amount assumes the purchase of 16,802 units of limited partnership interest of the subject partnership for $271 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. [X] 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. Amount Previously Paid: $910.67 Filing Party: AIMCO Properties, L.P. Form or Registration No.: Schedule TO Date Filed: August 8, 2000 [ ] 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: [X] third-party tender offer subject to Rule 14d-1 [ ] issuer tender offer subject to Rule 13e-4 [ ] going-private transaction subject to Rule 13e-3 [X] amendment to Schedule 13D under Rule 13d-2 Check the following box if the filing is a final amendment reporting the results of the tender offer: [X] 2 3 CUSIP No. NONE 1. NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) AIMCO PROPERTIES, L.P. 84-1275721 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (a) [ ] (b) [X] 3. SEC USE ONLY 4. SOURCE OF FUNDS WC, BK 5. (CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)) [ ] 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON 7. SOLE VOTING POWER -- 8. SHARED VOTING POWER 11,111 Units 9. SOLE DISPOSITIVE POWER -- 10. SHARED DISPOSITIVE POWER 11,111 Units 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 11,111 Units 12. CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Approximately 18.52% 14. TYPE OF REPORTING PERSON PN 3 4 CUSIP No. NONE 1. NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) AIMCO-GP, INC. 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (a) [ ] (b) [X] 3. SEC USE ONLY 4. SOURCE OF FUNDS Not Applicable 5. (CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)) [ ] 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON 7. SOLE VOTING POWER -- 8. SHARED VOTING POWER 11,111 Units 9. SOLE DISPOSITIVE POWER -- 10. SHARED DISPOSITIVE POWER 11,111 Units 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 11,111 Units 12. CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Approximately 18.52% 14. TYPE OF REPORTING PERSON CO 4 5 CUSIP No. NONE 1. NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) APARTMENT INVESTMENT AND MANAGEMENT COMPANY 84-129577 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (a) [ ] (b) [X] 3. SEC USE ONLY 4. SOURCE OF FUNDS Not Applicable 5. (CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)) [ ] 6. CITIZENSHIP OR PLACE OF ORGANIZATION Maryland NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON 7. SOLE VOTING POWER -- 8. SHARED VOTING POWER 43,636 Units 9. SOLE DISPOSITIVE POWER -- 10. SHARED DISPOSITIVE POWER 43,636 Units 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 43,636 Units 12. CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Approximately 72.21% 14. TYPE OF REPORTING PERSON CO 5 6 CUSIP No. NONE 1. NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) INSIGNIA PROPERTIES, L.P. 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (a) [ ] (b) [X] 3. SEC USE ONLY 4. SOURCE OF FUNDS Not Applicable 5. (CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)) [ ] 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON 7. SOLE VOTING POWER -- 8. SHARED VOTING POWER 32,525 Units 9. SOLE DISPOSITIVE POWER -- 10. SHARED DISPOSITIVE POWER 32,525 Units 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 32,525 Units 12. CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Approximately 54.20% 14. TYPE OF REPORTING PERSON PN 6 7 CUSIP No. NONE 1. NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) AIMCO/IPT, INC. 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (a) [ ] (b) [X] 3. SEC USE ONLY 4. SOURCE OF FUNDS Not Applicable 5. (CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)) [ ] 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON 7. SOLE VOTING POWER -- 8. SHARED VOTING POWER 32,525 Units 9. SOLE DISPOSITIVE POWER -- 10. SHARED DISPOSITIVE POWER 32,525 Units 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 32,525 Units 12. CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Approximately 54.20% 14. TYPE OF REPORTING PERSON CO 7 8 CUSIP No. NONE 1. NAME OF REPORTING PERSONS S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (entities only) IPLP ACQUISITION I, L.L.C. 2. CHECK THE APPROPRIATE BOX IF A MEMBER OF GROUP (a) [ ] (b) [X] 3. SEC USE ONLY 4. SOURCE OF FUNDS Not Applicable 5. (CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)) [ ] 6. CITIZENSHIP OR PLACE OF ORGANIZATION Delaware NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON 7. SOLE VOTING POWER -- 8. SHARED VOTING POWER 4,452 Units 9. SOLE DISPOSITIVE POWER -- 10. SHARED DISPOSITIVE POWER 4,452 Units 11. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 4,452 Units 12. CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES [ ] 13. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) Approximately 7.42% 14. TYPE OF REPORTING PERSON OO 8 9 AMENDMENT NO. 3 TO TENDER OFFER STATEMENT/ AMENDMENT NO. 20 TO SCHEDULE 13D This Statement (the "Statement") constitutes (a) Amendment No. 3 to the Tender Offer Statement on Schedule TO of AIMCO Properties, L.P. (the "AIMCO OP"), relating to an offer to purchase units of limited partnership interest ("Units") of National Property Investors 4 (the "Partnership"); and (b) Amendment No. 20 to the Schedule 13D (the "Schedule 13D") originally filed with the Securities and Exchange Commission (the "Commission") on August 29, 1995, by Insignia Financial Group, Inc. ("Insignia"), IFGP Corporation ("IFGP"), Insignia NPI, L.L.C. ("NPI"), Riverside Drive, L.L.C. ("Riverside") and Andrew L. Farkas, as amended by (i) Amendment No. 1, filed with the Commission on January 30, 1996, by Insignia, IFGP, NPI, Riverside, Insignia Commercial Group, Inc. ("Commercial"), Insignia Properties Corporation ("IPC") and Andrew L. Farkas, (ii) Amendment No. 2, filed with the Commission on February 28, 1996, by Insignia, IFGP, NPI, Riverside, Commercial, IPC and Andrew L. Farkas, (iii) Amendment No. 3, filed with the Commission on January 16, 1997, by Insignia, Insignia Properties, L.P. ("IPLP"), Insignia Properties Trust ("IPT") and Andrew L. Farkas, (iv) Amendment No. 4, filed with the Commission on August 28, 1997, by IPLP Acquisition I, L.L.C. ("IPLP Acquisition"), IPLP, IPT, Insignia and Andrew L. Farkas, (v) Amendment No. 5, filed with the Commission on September 26, 1997, by IPLP Acquisition, IPLP, IPT, Insignia and Andrew L. Farkas, (vi) Amendment No. 6, filed with the Commission on October 1, 1997, by IPLP Acquisition, IPLP, IPT, Insignia and Andrew L. Farkas, (vii) Amendment No. 7, filed with the Commission on October 3, 1997, by IPLP Acquisition, IPLP, IPT, Insignia and Andrew L. Farkas, (viii) Amendment No. 8, filed with the Commission on October 7, 1997, by IPLP Acquisition, IPLP, IPT, Insignia and Andrew L. Farkas, (ix) Amendment No. 9, filed with the Commission on November 10, 1997, by IPLP Acquisition, IPLP, IPT, Insignia and Andrew L. Farkas, (x) Amendment No. 10, filed with the Commission on October 26, 1998, by IPLP Acquisition, IPLP, IPT, AIMCO OP, AIMCO-GP, Inc. ("AIMCO-GP") and Apartment Investment and Management Company ("AIMCO"), (xi) Amendment No. 11, filed with the Commission on June 10, 1999, by IPLP Acquisition, AIMCO/IPT, Inc. ("AIMCO/IPT"), IPLP, AIMCO OP, AIMCO-GP and AIMCO, (xii) Amendment No. 12, filed with the Commission on July 1, 1999, by IPLP Acquisition, AIMCO/IPT, IPLP, AIMCO OP, AIMCO-GP and AIMCO, (xiii) Amendment No. 13, filed with the Commission on August 6, 1999, by IPLP Acquisition, AIMCO/IPT, IPLP, AIMCO OP, AIMCO-GP and AIMCO, (xiv) Amendment No. 14, filed with the Commission on November 17, 1999, by IPLP Acquisition, AIMCO/IPT, IPLP, AIMCO OP, AIMCO-GP and AIMCO, (xv) Amendment No. 15, dated December 16, 1999, by IPLP Acquisition, AIMCO/IPT, IPLP, AIMCO OP, AIMCO-GP and AIMCO, (xvi) Amendment No. 16, dated January 10, 2000, by IPLP Acquisition, AIMCO/IPT, IPLP, AIMCO OP, AIMCO-GP and AIMCO, (xvii) Amendment No. 17, dated August 7, 2000, by IPLP Acquisition, AIMCO/IPT, IPLP, AIMCO OP, AIMCO-GP and AIMCO, (xviii) Amendment No. 18, dated September 6, 2000, by IPLP Acquisition, AIMCO/IPT, IPLP, AIMCO OP, AIMCO-GP and AIMCO and (xix) Amendment No. 19, dated September 21, 2000, by IPLP Acquisition, AIMCO/IPT, IPLP, AIMCO OP, AIMCO-GP and AIMCO. ---------- 9 10 Item 8. Interest in Securities of the Subject Company At 5:00 p.m., New York time, on Thursday, September 28, 2000, the offer expired pursuant to its terms. A total of 709 Units, representing approximately 1.2% of the outstanding Units, were validly tendered and not withdrawn pursuant to the offer. AIMCO OP has accepted for payment all of those Units for $271 per Unit. Since July 1, 2000, AIMCO OP has purchased in privately negotiated transactions or through the facilities of the American Partnership Board, the following Units in the Partnership: DATE NUMBER OF UNITS SALE PRICE PER UNIT ---- -------------------------- -------------------- 8/1 3 $ 250.84 9/29 73 (1) - ---------- (1) The Units were purchased as part of a group purchase of 3,507.65 units in various partnerships for an aggregate price of $950,000. 10 11 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. Date: October 18, 2000 AIMCO PROPERTIES, L.P. By: AIMCO-GP, INC. (General Partner) By: /s/ Patrick J. Foye ------------------------------- Executive Vice President IPLP ACQUISITION I, L.L.C. By: /s/ Patrick J. Foye ------------------------------- Executive Vice President AIMCO/IPT, INC. By: /s/ Patrick J. Foye ------------------------------- Executive Vice President INSIGNIA PROPERTIES, L.P. By: AIMCO/IPT, 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 11