SEC FORM 3 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*
Lieblein Grace

(Last) (First) (Middle)
116 HUNTINGTON AVENUE

(Street)
BOSTON MA 02116

(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
06/13/2017
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.
/s/ Mneesha O. Nahata, as attorney-in-fact 06/16/2017
** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
LIMITED POWER OF ATTORNEY
FOR SECTION 16 REPORTING OBLIGATIONS

       Know all by these presents, that the undersigned hereby makes,
constitutes and appoints each of Thomas A. Bartlett, Edmund DiSanto,
Michael J. McCormack and Mneesha O. Nahata, 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, including other documents necessary to obtain
EDGAR codes and passwords enabling the undersigned to make
electronic filings with the Securities and Exchange Commission,
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 14 day of June, 2017.
/s/ Grace D. Lieblein
Name: Grace D.
Lieblein



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