[REVERSE OF SECURITY]
AMERICAN TOWER CORPORATION
3.000% Senior Notes due 2023
1. Interest. American Tower Corporation, a Delaware corporation (the
Company), promises to pay interest on the principal amount of this Security at the rate per annum shown above. The Company will pay interest, payable semi-annually in arrears, on June 15 and
December 15 of each year, with the first payment to be made on June 15, 2018. Interest on the Securities will accrue on the principal amount from, and including, the most recent date to which interest has been paid or provided for or, if
no interest has been paid, from, and including, December 8, 2017, in each case to, but excluding, the next Interest Payment Date or the Stated Maturity for the payment of principal on the Securities, as the case may be; provided that if
there is no existing Default in the payment of interest, the Company shall pay interest (including post-petition interest in any proceeding under any Bankruptcy Law) on overdue principal and premium, if any, from time to time on demand at a rate
that is 1% per annum in excess of the rate then in effect; it shall pay interest (including post-petition interest in any proceeding under any Bankruptcy Law) on overdue installments of interest (without regard to any applicable grace periods)
from time to time on demand at the same rate to the extent lawful. Interest shall be computed on the basis of a 360-day year of twelve 30-day months.
2. Maturity. The Securities will mature on June 15, 2023.
3. Method of Payment. Except as provided in the Indenture (as defined below), the Company shall pay interest on the
Securities to the persons who are Holders of record of Securities at the close of business on the Regular Record Date set forth on the face of this Security next preceding the applicable Interest Payment Date. Holders must surrender Securities to a
Paying Agent to collect the principal amount. The Company shall pay, in money of the United States that at the time of payment is legal tender for payment of public and private debts, all amounts due in cash with respect to the Securities, which
amounts shall be paid (A) in the case this Security is a Global Security, by wire transfer of immediately available funds to the account designated by the Depository for the Securities or its nominee; and (B) in the case this Security is a
Physical Security, by mailing a check to the address of the relevant Holder set forth in the Security Register for the Securities. The Company shall pay, in cash, interest on any overdue amount (including, to the extent permitted by applicable law,
overdue interest) at the rate borne by the Securities.
4. Paying Agent and Registrar. Initially, U.S. Bank National
Association (the Trustee) shall act as Paying Agent and Registrar. The Company may change any Paying Agent or Registrar upon prior written notice to the Trustee. The Company or any of its Subsidiaries may act in any such capacity.
5. Indenture. The Company issued the Securities under an indenture dated as of May 23, 2013 (as amended, supplemented or
otherwise modified from time to time prior to the date hereof, the Base Indenture) between the Company and the Trustee, as amended, supplemented or otherwise modified by the Supplemental Indenture No. 9 (the
Supplemental Indenture), dated as of December 8, 2017, between the Company and the Trustee (the Base Indenture, as amended, supplemented or otherwise modified by the Supplemental Indenture, the Indenture).
The terms of the Securities include those stated in the Indenture and those made part of the Indenture by reference to the Trust Indenture Act of 1939 (15 U.S. Code §§ 77aaa-77bbbb) (the TIA) as amended and in effect
from time to time. The Securities are subject to all such terms, and Holders are referred to the Indenture and the TIA for a statement of such terms. To the extent any provision of this Security conflicts with the express provisions of the
Indenture, the provisions of the Indenture shall govern and be controlling. The Securities are general unsecured senior obligations of the Company. The Original Securities are limited to $700,000,000 aggregate principal amount, except as otherwise
provided in the Indenture (except for Securities issued in substitution for destroyed, mutilated, lost or stolen Securities). Subject to the conditions set forth in the Indenture and without the consent of the Holders, the Company may issue
Additional Securities. All Securities, including any