SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person* Lara Gustavo (Last) (First) (Middle) 116 HUNTINGTON AVENUE (Street) BOSTON MA 02116 (City) (State) (Zip)	2. Date of Event Requiring Statement (Month/Day/Year) 11/12/2004	3. Issuer Name and Ticker or Trading Symbol AMERICAN TOWER CORP /MA/ [ AMT ]
		4. Relationship of Reporting Person(s) to Issuer (Check all applicable) X Director 10% Owner Officer (give title below) Other (specify below)	5. If Amendment, Date of Original Filed (Month/Day/Year)
			6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

No securities are beneficially owned.

	Nathaniel Sisitsky (as attorney-in-fact)	11/22/2004
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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LIMITED POWER OF ATTORNEY
FOR SECTION 16 REPORTING OBLIGATIONS

Know all by these presents, that the undersigned
hereby makes, constitutes and appoints each of
William H. Hess, Bradley E. Singer and Nathaniel B.
Sisitsky, signing singly and each acting individually,
as the undersigned's true and lawful attorney-in-fact
with full power and authority as hereinafter described to:

(1)	execute for and on behalf of the undersigned,
in the undersigned's capacity as a director of American
Tower Corporation (the "Company"), Form ID, Forms 3, 4,
and 5 (including any amendments thereto) in accordance
with Section 16(a) of the Securities Exchange
Act of 1934 and the rules thereunder (the "Exchange Act");

(2)	do and perform any and all acts for
and on behalf of the undersigned which may be necessary
or desirable to prepare, complete and execute any such
Form ID, Form 3, 4, or 5, prepare, complete and execute
any amendment or amendments thereto, and timely deliver
and file such form with the United States Securities and
Exchange Commission and any stock exchange or similar
authority;

(3)	seek or obtain, as the undersigned's
representative and on the undersigned's behalf, information
regarding transactions in the Company's securities from
any third party, including brokers, employee benefit plan
administrators and trustees, and the undersigned hereby
authorizes any such person to release any such information
to such attorney-in-fact and approves and ratifies any such
release of information; and

(4)	take any other action of any type whatsoever
in connection with the foregoing which, in the opinion
of such attorney-in-fact, may be of benefit to, in the
best interest of, or legally required by, the undersigned,
it being understood that the documents executed by such
attorney-in-fact on behalf of the undersigned pursuant to
this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact
may approve in such attorney-in-fact's discretion.

The undersigned hereby grants to each such attorney-in-
fact full power and authority to do and perform any and
every act and thing whatsoever requisite, necessary,
or proper to be done in the exercise of any of the
rights and powers herein granted, as fully to all intents
and purposes as the undersigned might or could do if
personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that
such attorney-in-fact, or such attorney-in-fact's substitute
or substitutes, shall lawfully do or cause to be
done by virtue of this power of attorney and the
rights and powers herein granted.  The undersigned
acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned,
are not assuming nor relieving, nor is the Company assuming
nor relieving, any of the undersigned's responsibilities to
comply with Section 16 of the Exchange Act.

The undersigned acknowledges that neither the Company
nor the foregoing attorneys-in-fact assume (i) any liability
for the undersigned's responsibility to comply with the
requirement of the Exchange Act, (ii) any liability of the
undersigned for any failure to comply with such requirements,
or (iii) any obligation or liability of the undersigned for
profit disgorgement under Section 16(b) of the Exchange Act.

This Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3,
4, and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, unless
earlier revoked by the undersigned in a signed writing delivered
to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power
of Attorney to be executed as of this 16th day of November, 2004.

/s/  Gustavo Lara
Gustavo Lara