FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the Quarterly Period Ended June 30, 2026 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period fromto Commission File Number: 001-36105 EMPIRE STATE REALTY TRUST, INC. (Exact name of Registrant as specified in its charter) Maryland37-1645259(State or other jurisdiction of incorporation or organization)(I.R.S. Employer Identification No.) 111 West 33rd Street, 12th FloorNew York, New York 10120(Address of principal executive offices) (Zip Code)(212) 687-8700(Registrant's telephone number, including area code) Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d) of the Securities ExchangeAct 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 subjectto such filing requirements for the past 90 days.Yes☒No☐ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant toRule 405 of RegulationS-T during the preceding 12 months (or for such shorter period that the registrant was required to submit suchfiles).Yes☒No☐ Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reportingcompany, or an emerging growth company. See definition of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and"emerging growth company" in Rule12b-2 of the Exchange Act. Large accelerated filer☒Acceleratedfiler☐Non-accelerated filer☐Smallerreportingcompany☐Emerging growthcompany☐ If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complyingwith any new or revised financial accounting standards provided pursuant to Section 13(a) 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☒ As of August4, 2026, there were 172,165,643 shares of Class A Common Stock, $0.01 par value per share, outstanding and 967,006 sharesof Class B Common Stock, $0.01 par value per share, outstanding. Empire State Realty Trust, Inc.Consolidated Statements of Cash Flows(unaudited) Empire State Realty Trust, Inc.Consolidated Statements of Cash Flows (continued)(unaudited) Empire State Realty Trust, Inc.Notes to Consolidated Financial Statements(unaudited) 1. Description of Business and Organization As used in these consolidated financial statements, unless the context otherwise requires, “we,” “us,” “our,” the “Company,”and "ESRT" mean Empire State Realty Trust, Inc. and its consolidated subsidiaries. Empire State Realty Trust, Inc. (NYSE: ESRT) is a NYC-focused real estate investment trust ("REIT") that owns andoperates a portfolio of well-leased, top of tier, modernized, amenitized, and well-located office, retail, and multifamily assets. ESRT’sflagship Empire State Building, the “World's Most Famous Building,” features its iconic Observation Deck. The Company is arecognized leader in energy efficiency and indoor environmental quality. As of June30, 2026, our portfolio was comprised of approximately 7.5million rentable square feet of office space,0.8million rentable square feet of retail space and 743 residential units, which are located in New York City. Our office portfolioincluded 9 properties (including one long-term ground leasehold interest), all of which are located in Manhattan. Additionally, we haveentitled land in Stamford, Connecticut that can support the development of either office or residential per local zoning. We were organized as a Maryland corporation on July 29, 2011 and commenced operations upon completion of our initialpublic offering and related formation transactions on October 7, 2013 (the "Offering"). Our operating partnership, Empire State RealtyOP, L.P. (the "Operating Partnership"), holds substantially all of our assets and conducts substantially all of our business. As ofJune30, 2026, we owned approximately 61.0% of the aggregate operating partnership units in the Operating Partnership.We, as thesole general partner in the Operating Partnership, have responsibility and discretion in the management and control of the OperatingPartnership, and the limited partners in the Operating Partnership, in such capacity, have no authority to transact business for, orparticipate in the management activities of, the Operating Partnership. Accordingly, the Operating Partnership has been consolidatedby us. We elected to be subject to tax as a REIT for U.S. federal income tax purposes commencing with our taxable year endedDecember 31, 2013. 2. Summary of Significant Accounting Policies There have been no material changes