UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q/A

(Amendment No. 1)

For the Quarterly Period Ended June 30, 2015

For the transition period from                      to                     

Commission File Number: 001-36105

EMPIRE STATE REALTY TRUST, INC.

(Exact name of Registrant as specified in its charter) 

One Grand Central Place

60 East 42nd Street

New York, New York 10165

(Address of principal executive offices) (Zip Code)

(212) 687-8700

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definition of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Explanatory Note

This Amendment No. 1 amends the registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 (the “Original Form 10-Q”) solely for the purpose of filing updated officer certifications required by Section 302 of the Sarbanes-Oxley Act of 2002, in conformity with Item 601(b)(31)(i) of Regulation S-K, including certain required language from paragraph 4 that was inadvertently omitted from the versions of the certifications filed with the Original Form 10-Q. In accordance with applicable Securities and Exchange Commission guidance, this Form 10-Q/A contains only the cover page, this explanatory note, a signature page, and the revised officer certifications, which are filed as Exhibits 31.1 and 31.2 herewith.

Except as described above and except for Exhibits 31.1 and 31.2 filed herewith, the disclosures presented in the Original Form 10-Q filed on August 5, 2015 have not been amended or updated and this report speaks only as of such filing date. Therefore, you should refer to the registrant’s Current Reports on Form 8-K and other reports subsequently filed with or furnished to the Securities and Exchange Commission for information about the registrant since August 5, 2015.

2

The exhibit index below lists the exhibits that are being filed with this Form 10-Q/A.

3

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

EMPIRE STATE REALTY TRUST, INC.

4

Exhibit Index

5