U.S. SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                     FORM 5

               ANNUAL STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

    Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934,
       Section 17(a) of the Public Utility Holding Company Act of 1935 or
               Section 30(f) of the Investment Company Act of 1940

[_]  Check box if no longer  subject to Section 16. Form 4 or Form 5 obligations
     may continue. See Instruction 1(b).

[_]  Form 3 Holdings Reported

[_]  Form 4 Transactions Reported

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1.   Name and Address of Reporting Person*

Chavkin                                 Arnold                  L.
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   (Last)                            (First)              (Middle)

c/o J.P. Morgan Partners, LLC
1221 Avenue of the Americas-40th Floor
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                                    (Street)

New York                             New York                   10020
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   (City)                            (State)                (Zip)
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2.   Issuer Name and Ticker or Trading Symbol


American Tower Corporation ("AMT")
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3.   IRS Identification Number of Reporting Person, if an Entity (Voluntary)



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4.   Statement for Month/Year


12/31/2000
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5.   If Amendment, Date of Original (Month/Year)



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6.   Relationship of Reporting Person to Issuer
     (Check all applicable)

     [X]  Director                             [_]  10% Owner
     [_]  Officer (give title below)           [_]  Other (specify below)

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7.   Individual or Joint/Group Filing
     (Check applicable line)

     [X]  Form filed by one Reporting Person
     [_]  Form filed by more than one Reporting Person
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           Table I -- Non-Derivative Securities Acquired, Disposed of,
                             or Beneficially Owned
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5. 6. 4. Amount of Owner- Securities Acquired (A) or Securities ship Disposed of (D) Beneficially Form: 7. (Instr. 3, 4 and 5) Owned at End Direct Nature of 2. 3. ----------------------------- of Issuer's (D) or Indirect 1. Transaction Transaction (A) Fiscal Year Indirect Beneficial Title of Security Date Code Amount or Price (Instr. 3 (I) Ownership (Instr. 3) (mm/dd/yy) (Instr. 8) (D) and 4) (Instr.4) (Instr. 4) - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ ====================================================================================================================================
* If the form is filed by more than one Reporting Person, see Instruction 4(b)(v). Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly. (Over) (Form 5-07/99) FORM 5 (continued) Table II -- Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities) ================================================================================
9. 10. Number Owner- of ship 2. Deriv- of Conver- 5. 7. ative Deriv- 11. sion Number of Title and Amount Secur- ative Nature or Derivative 6. of Underlying 8. ities Secur- of Exer- Securities Date Securities Price Bene- ity: In- cise 3. Acquired (A) Exercisable and (Instr. 3 and 4) of ficially Direct direct Price Trans- 4. or Disposed Expiration Date ---------------- Deriv- Owned (D) or Bene- 1. of action Trans- of (D) (Month/Day/Year) Amount ative at End In- ficial Title of Deriv- Date action (Instr. 3, ---------------- or Secur- of direct Owner- Derivative ative (Month/ Code 4 and 5) Date Expira- Number ity Year (I) ship Security Secur- Day/ (Instr. ------------ Exer- tion of (Instr. (Instr. (Instr. (Instr. (Instr. 3) ity Year) 8) (A) (D) cisable Date Title Shares 5) 4) 4) 4) - ------------------------------------------------------------------------------------------------------------------------------------ Option to Class purchase Class A A Common Common Stock (FN 1) $30.63 9/21/00 A 15,000 9/21/00 9/21/10 Stock 15,000 15,000 D - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ - ------------------------------------------------------------------------------------------------------------------------------------ ====================================================================================================================================
Explanation of Responses: (1) Stock option grant for non-employee directors issued pursuant to the 1997 American Tower Stock Option Plan. The reporting person is obligated to exercise these options at the request of, and to transfer the shares issued thereunder to, J.P. Morgan Partners (BHCA), LLC. The reporting person disclaims beneficial ownership of the options and any shares issuable upon their exercise to the extent such ownership exceeds his pecuniary interest therein. /s/ Arnold L. Chavkin 2/14/01 - --------------------------------------------- ----------------------- Arnold L. Chavkin Date ** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a). Note: File three copies of this form, one of which must be manually signed. If space provided is insufficient, see Instruction 6 for procedure. Page 2 Derivative Securities Codes (Except For Transactions Exempt Pursuant to Rule 16b-3) C--Conversion of derivative security E--Expiration of short derivative position H--Expiration (or cancellation) of long derivative position with value received O--Exercise of out-of-the-money derivative security X--Exercise of in-the-money or at-the-money derivative security Other Section 16(b) Exempt Transaction and Small Acquisition Codes (Except For Rule 16b-3 Codes Above) G--Bona fide gift L--Small acquisition under Rule 16a-6 W--Acquisition or disposition by will or the laws of descent and distribution Z--Deposit into or withdrawal from voting trust Other Transaction Codes J--Other acquisition or disposition (describe transaction) K--Transaction in equity swap or instrument with similar characteristics U--Disposition pursuant to a tender of shares in a change of control transaction To indicate that a holding should have been reported previously on Form 3, place a "3" in Table I, column 3 or Table II, column 4, as appropriate. Indicate in the space provided for explanation of responses the event triggering the Form 3 filing obligation. To indicate that a transaction should have been reported previously on Form 4, place a "4" next to the transaction code reported in Table I, column 3 or Table II, column 4 (e.g., an open market purchase of a non-derivative security that should have been reported previously on Form 4 should be designated as "P4"). To indicate that a transaction should have been reported on a previous Form 5, place a "5" in Table I, column 3 or Table II, column 4, as appropriate. In addition, the appropriate box on the front page of the form should be checked. FORM 3 OR FORM 4 HOLDINGS OR TRANSACTIONS NOT PREVIOUSLY REPORTED To indicate that a holding should have been reported previously on a Form 3, place a "3" in Table I, column 3 or Table II, column 4, as appropriate. Indicate in the space provided for explanation of responses the event triggering the Form 3 filing obligation. To indicate that a transaction should have been reported previously on Form 4, place a "4" next to the transaction code reported in Table I, column 3 or Table II, column 4 (e.g., an open market purchase of a non-derivative security that should have been reported previously on Form 4 should be designated as "P4"). In addition, the appropriate box on the front page of the form should be checked.