Empire State Realty OP (FISK) 10-K 28 Feb 24 2023 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2023	Feb. 22, 2024	Jun. 30, 2023
Document Information [Line Items]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-36106
Entity Registrant Name	EMPIRE STATE REALTY OP, L.P.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-4685158
Entity Address, Address Line One	111 West 33rd Street
Entity Address, Address Line Two	12th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10120
City Area Code	212
Local Phone Number	687-8700
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Documents Incorporated by Reference	Our sole general partner is Empire State Realty Trust, Inc. Portions of Empire State Realty Trust, Inc.'s Proxy Statement for its 2023 Annual Stockholders' Meeting (which is scheduled to be held on May 9, 2024 in-person and virtually via a live webcast) to be filed within 120 days after the end of Empire State Realty Trust, Inc.'s fiscal year are incorporated by reference into Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0001553079
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Public Float			$ 0
Series ES Operating Partnership Units Limited Partners
Document Information [Line Items]
Title of 12(b) Security	Series ES operating partnership units
Trading Symbol	ESBA
Security Exchange Name	NYSEArca
Entity Common Stock, Shares Outstanding		19,504,737
Series 60 Operating Partnership Units Limited Partners
Document Information [Line Items]
Title of 12(b) Security	Series 60 operating partnership units
Trading Symbol	OGCP
Security Exchange Name	NYSEArca
Entity Common Stock, Shares Outstanding		5,036,429
Series 250 Operating Partnership Units Limited Partners
Document Information [Line Items]
Title of 12(b) Security	Series 250 operating partnership units
Trading Symbol	FISK
Security Exchange Name	NYSEArca
Entity Common Stock, Shares Outstanding		2,588,428

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2023
Audit Information [Abstract]
Auditor Name	Ernst & Young LLP
Auditor Location	New York, New York
Auditor Firm ID	42

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Commercial real estate properties, at cost:
Land	$ 366,357	$ 365,540
Development costs	8,178	8,166
Building and improvements	3,280,657	3,177,743
Commercial real estate properties, at cost, gross	3,655,192	3,551,449
Less: accumulated depreciation	(1,250,062)	(1,137,267)
Commercial real estate properties, net	2,405,130	2,414,182
Assets held for sale	0	35,538
Cash and cash equivalents	346,620	264,434
Restricted cash	60,336	50,244
Tenant and other receivables	39,836	24,102
Deferred rent receivables	255,628	240,188
Prepaid expenses and other assets	98,167	98,114
Deferred costs, net	172,457	187,570
Acquired below-market ground leases, net	321,241	329,073
Right of use assets	28,439	28,670
Goodwill	491,479	491,479
Total assets	4,219,333	4,163,594
Liabilities:
Mortgage notes payable, net	877,388	883,705
Senior unsecured notes, net	973,872	973,659
Unsecured term loan facilities, net	389,286	388,773
Unsecured revolving credit facility	0	0
Accounts payable and accrued expenses	99,756	80,729
Acquired below-market leases, net	13,750	17,849
Ground lease liabilities	28,439	28,670
Deferred revenue and other liabilities	70,298	76,091
Tenants’ security deposits	35,499	25,084
Liabilities related to assets held for sale	0	5,943
Total liabilities	2,488,288	2,480,503
Commitments and contingencies
Capital:
Total Empire State Realty OP, L.P.'s capital	1,715,638	1,667,625
Non-controlling interest in other partnerships	15,407	15,466
Total capital	1,731,045	1,683,091
Total liabilities and capital	4,219,333	4,163,594
Private Perpetual Preferred Units, Series 2019
Capital:
Private perpetual preferred units	21,936	21,936
Private Perpetual Preferred Units, Series 2014
Capital:
Private perpetual preferred units	8,004	8,004
Series PR Operating Partnership Units
Capital:
ESRT partners' capital (2,709 and 2,710 general partner operating partnership units and 160,337 and 158,420 limited partner operating partnership units outstanding at December 31, 2023 and 2022, respectively)	985,518	954,375
Limited partner operating partnership units	694,512	681,827
Series ES Operating Partnership Units Limited Partners
Capital:
Limited partner operating partnership units	4,427	1,391
Series 60 Operating Partnership Units Limited Partners
Capital:
Limited partner operating partnership units	779	16
Series 250 Operating Partnership Units Limited Partners
Capital:
Limited partner operating partnership units	$ 462	$ 76

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2023	Dec. 31, 2022
Capital:
Private perpetual preferred units, issued (in shares)	4,664,000
Private perpetual preferred units, outstanding (in shares)	4,664,000
Private Perpetual Preferred Units, Series 2019
Capital:
Private perpetual preferred units, liquidation preference per share (in dollars per share)	$ 13.52	$ 13.52
Private perpetual preferred units, issued (in shares)	4,664,038	4,664,000
Private perpetual preferred units, outstanding (in shares)		4,664,000
Private Perpetual Preferred Units, Series 2014
Capital:
Private perpetual preferred units, liquidation preference per share (in dollars per share)	$ 16.62	$ 16.62
Private perpetual preferred units, issued (in shares)	1,560,000	1,560,000
Private perpetual preferred units, outstanding (in shares)	1,560,000	1,560,000
Series PR Operating Partnership Units
Capital:
Limited partner operating partnership units, outstanding (in shares)	80,189,000	80,475,000
Series PR Operating Partnership Units | ESRT
Capital:
General partner operating partnership units, outstanding (in shares)	2,709,000	2,710,000
Limited partner operating partnership units, outstanding (in shares)	160,337,000	158,420,000
Series ES Operating Partnership Units Limited Partners
Capital:
Limited partner operating partnership units, outstanding (in shares)	19,947,000	21,081,000
Series 60 Operating Partnership Units Limited Partners
Capital:
Limited partner operating partnership units, outstanding (in shares)	5,144,000	5,558,000
Series 250 Operating Partnership Units Limited Partners
Capital:
Limited partner operating partnership units, outstanding (in shares)	2,619,000	2,789,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Rental revenue	$ 597,319	$ 591,048	$ 559,690
Observatory revenue	129,366	105,978	41,474
Lease termination fees	0	20,032	16,230
Third-party management and other fees	1,351	1,361	1,219
Other revenue and fees	11,536	8,622	5,481
Total revenues	739,572	727,041	624,094
Operating expenses:
Property operating expenses	167,324	157,935	126,986
Ground rent expenses	9,326	9,326	9,326
General and administrative expenses	63,939	61,765	55,947
Observatory expenses	35,265	31,036	23,206
Real estate taxes	127,101	123,057	119,967
Impairment charges	0	0	7,723
Depreciation and amortization	189,911	216,894	201,806
Total operating expenses	592,866	600,013	544,961
Total operating income	146,706	127,028	79,133
Other income (expense):
Interest income	15,136	4,948	704
Interest expense	(101,484)	(101,206)	(94,394)
Gain on sale/disposition of properties	26,764	33,988	0
Loss on early extinguishment of debt	0	0	(214)
Income (loss) before income taxes	87,122	64,758	(14,771)
Income tax (expense) benefit	(2,715)	(1,546)	1,734
Net income (loss)	84,407	63,212	(13,037)
Private perpetual preferred unit distributions	(4,201)	(4,201)	(4,201)
Net (income) loss attributable to non-controlling interest in other partnerships	(68)	243	17
Net income (loss) attributable to common unitholders	$ 80,138	$ 59,254	$ (17,221)
Total weighted average units:
Basic (in shares)	263,226	268,337	277,420
Diluted (in shares)	265,633	269,948	277,420
Earnings (loss) per unit:
Basic (in dollars per share)	$ 0.30	$ 0.22	$ (0.06)
Diluted (in dollars per share)	$ 0.30	$ 0.22	$ (0.06)

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 84,407	$ 63,212	$ (13,037)
Other comprehensive income (loss):
Unrealized gain on valuation of interest rate swap agreements	5,581	40,044	348
Amount reclassified into interest expense	(7,819)	7,230	11,653
Other comprehensive income (loss)	(2,238)	47,274	12,001
Comprehensive income (loss)	$ 82,169	$ 110,486	$ (1,036)

Consolidated Statements of Capi

Consolidated Statements of Capital - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	$ 1,683,091	$ 1,684,332	$ 1,731,307
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital	$ 0	0	0
Repurchase of common units (in shares)	(2,150,857)
Repurchases of common units	$ (13,105)	(90,176)	(46,704)
Contributions to consolidated joint venture interests	187	224	13,269
Equity compensation	20,026	21,011	20,260
Distributions	(41,323)	(42,786)	(32,764)
Net income (loss)	84,407	63,212	(13,037)
Other comprehensive income (loss)	(2,238)	47,274	12,001
Ending balance	$ 1,731,045	$ 1,683,091	$ 1,684,332
General Partner | Series PR Operating Partnership Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in shares)	161,129,000	170,217,000	171,565,000
Beginning balance	$ 954,375	$ 998,128	$ 1,055,249
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital (in shares)	3,756,000	2,298,000	3,498,000
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital	$ 17,671	$ 4,495	$ 10,426
Repurchase of common units (in shares)	(2,151,000)	(11,571,000)	(4,887,000)
Repurchases of common units	$ (13,105)	$ (90,176)	$ (46,704)
Equity compensation (in shares)	312,000	185,000	41,000
Equity compensation	$ 1,395	$ 894	$ 513
Distributions	(22,684)	(23,109)	(18,110)
Net income (loss)	49,044	36,442	(10,711)
Other comprehensive income (loss)	$ (1,178)	$ 27,701	$ 7,465
Ending balance (in shares)	163,046,000	161,129,000	170,217,000
Ending balance	$ 985,518	$ 954,375	$ 998,128
Limited Partners | Series PR Operating Partnership Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in shares)	80,475,000	79,820,000	80,355,000
Beginning balance	$ 681,827	$ 649,157	$ 648,543
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital (in shares)	(2,038,000)	(551,000)	(1,317,000)
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital	$ (17,380)	$ (4,563)	$ (10,643)
Equity compensation (in shares)	1,752,000	1,206,000	782,000
Equity compensation	$ 18,631	$ 20,117	$ 19,747
Distributions	(10,466)	(11,251)	(7,121)
Net income (loss)	22,439	16,116	(4,513)
Other comprehensive income (loss)	$ (539)	$ 12,251	$ 3,144
Ending balance (in shares)	80,189,000	80,475,000	79,820,000
Ending balance	$ 694,512	$ 681,827	$ 649,157
Limited Partners | Series ES Operating Partnership Units Limited Partners
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in shares)	21,081,000	22,321,000	23,678,000
Beginning balance	$ 1,391	$ (4,058)	$ (1,348)
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital (in shares)	(1,134,000)	(1,240,000)	(1,357,000)
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital	$ (215)	$ 26	$ 105
Distributions	(2,850)	(3,025)	(2,382)
Net income (loss)	6,251	4,800	(1,429)
Other comprehensive income (loss)	$ (150)	$ 3,648	$ 996
Ending balance (in shares)	19,947,000	21,081,000	22,321,000
Ending balance	$ 4,427	$ 1,391	$ (4,058)
Limited Partners | Series 60 Operating Partnership Units Limited Partners
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in shares)	5,558,000	5,884,000	6,424,000
Beginning balance	$ 16	$ (1,395)	$ (721)
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital (in shares)	(414,000)	(326,000)	(540,000)
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital	$ (53)	$ 21	$ 73
Distributions	(749)	(800)	(632)
Net income (loss)	1,603	1,244	(379)
Other comprehensive income (loss)	$ (38)	$ 946	$ 264
Ending balance (in shares)	5,144,000	5,558,000	5,884,000
Ending balance	$ 779	$ 16	$ (1,395)
Limited Partners | Series 250 Operating Partnership Units Limited Partners
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in shares)	2,789,000	2,970,000	3,255,000
Beginning balance	$ 76	$ (692)	$ (356)
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital (in shares)	(170,000)	(181,000)	(285,000)
Conversion of operating partnership units and Class B shares to ESRT Partner's Capital	$ (23)	$ 21	$ 39
Distributions	(373)	(400)	(318)
Net income (loss)	801	652	(189)
Other comprehensive income (loss)	$ (19)	$ 495	$ 132
Ending balance (in shares)	2,619,000	2,789,000	2,970,000
Ending balance	$ 462	$ 76	$ (692)
Private Perpetual Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (in shares)	6,224,000	6,224,000	6,224,000
Beginning balance	$ 29,940	$ 29,940	$ 29,940
Distributions	(4,201)	(4,201)	(4,201)
Net income (loss)	$ 4,201	$ 4,201	$ 4,201
Ending balance (in shares)	6,224,000	6,224,000	6,224,000
Ending balance	$ 29,940	$ 29,940	$ 29,940
Non-controlling Interest in Other Partnerships
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	15,466	13,252	0
Contributions to consolidated joint venture interests	187	224	13,269
Net income (loss)	68	(243)	(17)
Other comprehensive income (loss)	(314)	2,233
Ending balance	$ 15,407	$ 15,466	$ 13,252

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows From Operating Activities
Net income (loss)	$ 84,407	$ 63,212	$ (13,037)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	189,911	216,894	201,806
Gain on sale/disposition of properties	(26,764)	(33,988)	0
Impairment charges	0	0	7,723
Amortization of non-cash items within interest expense	9,089	9,799	10,862
Amortization of acquired above- and below-market leases, net	(2,415)	(4,759)	(5,896)
Amortization of acquired below-market ground leases	7,831	7,831	7,831
Straight-lining of rental revenue	(19,563)	(24,562)	(21,078)
Equity based compensation	20,026	21,011	20,260
Loss on early extinguishment of debt	0	0	214
Increase (decrease) in cash flows due to changes in operating assets and liabilities:
Security deposits	10,486	(828)	(1,052)
Tenant and other receivables	(15,643)	(5,306)	2,894
Deferred leasing costs	(17,669)	(36,909)	(16,090)
Prepaid expenses and other assets	(5,186)	(2,263)	5,814
Accounts payable and accrued expenses	746	4,705	(99)
Deferred revenue and other liabilities	(2,765)	(3,664)	12,334
Net cash provided by operating activities	232,491	211,173	212,486
Cash Flows From Investing Activities
Acquisition of real estate property	(26,910)	(115,593)	(117,540)
Net proceeds from disposition of real estate	88,910	11,005	0
Additions to building and improvements	(139,328)	(126,268)	(95,037)
Development costs	(12)	(35)	(165)
Net cash used in investing activities	(77,340)	(230,891)	(212,742)
Cash Flows From Financing Activities
Repayment of mortgage notes payable	(8,632)	(7,504)	(4,091)
Contributions from consolidated joint ventures	187	224	0
Deferred financing costs	0	0	(9,486)
Repurchases of common units	(13,105)	(90,176)	(46,704)
Private perpetual preferred unit distributions	(4,201)	(4,201)	(4,201)
Distributions	(37,122)	(38,585)	(28,563)
Net cash used in financing activities	(62,873)	(140,242)	(93,045)
Net increase (decrease) in cash and cash equivalents and restricted cash	92,278	(159,960)	(93,301)
Cash and cash equivalents and restricted cash—beginning of period	314,678	474,638	567,939
Cash and cash equivalents and restricted cash—end of period	406,956	314,678	474,638
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	264,434	423,695	526,714
Restricted cash at beginning of period	50,244	50,943	41,225
Cash and cash equivalents at end of period	346,620	264,434	423,695
Restricted cash at end of period	60,336	50,244	50,943
Cash and cash equivalents and restricted cash	406,956	314,678	474,638
Supplemental disclosures of cash flow information:
Cash paid for interest	92,000	91,012	77,610
Cash paid for income taxes	1,390	200	644
Non-cash investing and financing activities:
Building and improvements included in accounts payable and accrued expenses	51,815	44,293	49,247
Write-off of fully depreciated assets	33,391	35,124	31,341
Derivative instruments at fair values included in prepaid expenses and other assets	11,800	17,902	0
Derivative instruments at fair values included in accounts payable and accrued expenses	85	0	25,308
Conversion of operating partnership units and Class B shares to Class A shares	17,671	4,495	10,426
Transfer of assets related to assets held for sale	0	35,538	0
Transfer of liabilities related to assets held for sale	0	5,943	0
Mortgage assumed in connection with sale of real estate	0	30,117	0
Debt assumed with the acquisition of real estate properties	0	0	177,453
Contribution from other partnerships	$ 0	$ 0	$ 13,269

Description of Business and Org

Description of Business and Organization	12 Months Ended
	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Organization	Description of Business and Organization As used in these consolidated financial statements, unless the context otherwise requires, “we,” “us,” "our," and the "Company,” mean Empire State Realty OP, L.P. and its consolidated subsidiaries. Empire State Realty OP, L.P. (the "Operating Partnership") is the entity through which Empire State Realty Trust, Inc. (NYSE: ESRT), a NYC-focused REIT that owns and operates a portfolio of modernized, amenitized, and well-located office, retail, and multifamily assets, conducts all of its business and owns (either directly or through subsidiaries) substantially all of its assets. The Company is a recognized leader in energy efficiency and indoor environmental quality. ESRT’s flagship Empire State Building – the “World’s Most Famous Building” – includes its Observatory, the #1 attraction in the U.S. in Tripadvisor’s Travelers’ Choice Awards: Best of the Best for two consecutive years . As of December 31, 2023, ESRT’s portfolio was comprised of approximately 8.6 million rentable square feet of office space, 0.7 million rentable square feet of retail space and 727 residential units. Our office portfolio included 11 properties (including three long-term ground leasehold interests) encompassing approximately 8.6 million rentable square feet. Nine of these office properties are located in midtown Manhattan and encompass approximately 7.6 million rentable square feet, including the Empire State Building. The remaining two office properties encompass approximately 1.1 million rentable square feet and are located in Stamford, Connecticut, with immediate access to mass transportation. Additionally, we have entitled land adjacent to one of the Stamford office properties that can support the development of either office or residential per local zoning. Our multifamily portfolio included 727 residential units in New York City. We were organized as a Delaware limited partnership on November 28, 2011, and commenced operations upon completion of the initial public offering of ESRT’s Class A common stock and related formation transactions on October 7, 2013 (the "IPO"). ESRT's Class A common stock, par value $0.01 per share, is listed on the New York Stock Exchange under the symbol "ESRT." ESRT, as the sole general partner in our Company, has responsibility and discretion in the management and control of our Company, and our limited partners, in such capacity, have no authority to transact business for, or participate in the management activities, of our Company. As of December 31, 2023, ESRT owned approximately 60.2% of our operating partnership units.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation The accompanying consolidated financial statements prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP") and with the rules and regulations of the SEC, represent our assets and liabilities and operating results. The consolidated financial statements include our accounts and our partially owned and wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. We consolidate entities in which we have a controlling financial interest. In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, authority to make decisions, and contractual and substantive participating rights of the partners/members. For variable interest entities ("VIE"), we consolidate the entity if we are deemed to have a variable interest in the entity and through that interest we are deemed the primary beneficiary. The primary beneficiary of a VIE is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. The primary beneficiary is required to consolidate the VIE. At December 31, 2022, we were the primary beneficiary of a variable interest in the intermediary entity which held title to 298 Mulberry Street, the multifamily asset acquired in December 2022. The intermediary entity was utilized to execute a like-kind exchange and subsequent to March 31, 2023, the like-kind exchange was completed and we took title to 298 Mulberry Street. Therefore, we had no VIEs at December 31, 2023. We will assess the accounting treatment for each investment we may have in the future. This assessment will include a review of each entity’s organizational agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we will review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity’s economic performance and benefit. In situations where we or our partner could approve, among other things, the annual budget, or leases that cover more than a nominal amount of space relative to the total rentable space at each property, we would not consolidate the investment as we consider these to be substantive participation rights that result in shared power of the activities that would most significantly impact the performance and benefit of such joint venture investment. A non-controlling interest in a consolidated subsidiary is defined as the portion of the equity (net assets) in a subsidiary not attributable, directly or indirectly, to a parent. Non-controlling interests are required to be presented as a separate component of equity in the consolidated balance sheets and in the consolidated statements of income by requiring earnings and other comprehensive income to be attributed to controlling and non-controlling interests. Accounting Estimates The preparation of the consolidated financial statements in accordance with GAAP requires management to use estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported revenues and expenses. Significant items subject to such estimates and assumptions include allocation of the purchase price of acquired real estate properties among tangible and intangible assets, determination of the useful life of real estate properties and other long-lived assets, valuation and impairment analysis of commercial real estate properties, goodwill, right-of-use assets and other long-lived and indefinite-lived assets, estimate of tenant expense reimbursements, valuation of the allowance for doubtful accounts, and valuation of derivative instruments, ground lease liabilities, senior unsecured notes, mortgage notes payable, unsecured revolving credit and term loan facilities, and equity based compensation. These estimates are prepared using management’s best judgment, after considering past, current, and expected events and economic conditions. Actual results could differ from those estimates. Revenue Recognition Rental Revenue Rental revenue includes base rents that each tenant pays in accordance with the terms of its respective lease and is reported on a straight-line basis over the non-cancellable term of the lease which includes the effects of rent steps and rent abatements under the leases. In general, we commence rental revenue recognition when the tenant takes possession of the leased space or controls the physical use of the leased space and the leased space is substantially ready for its intended use. We account for all of our leases as operating leases. Deferred rent receivables, including free rental periods and leasing arrangements allowing for increased base rent payments, are accounted for in a manner that provides an even amount of fixed lease revenues over the respective non-cancellable lease terms. Differences between rental income recognized and amounts due under the respective lease agreements are recognized as an increase or decrease to deferred rent receivables. In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in an index such as the Consumer Price Index over the index value in effect during a base year, or contain fixed percentage increases over the base rent to cover escalations. We recognize rental revenue of acquired in-place above- and below-market leases at their fair values over the terms of the respective leases, including, for below-market leases, fixed option renewal periods, if any. Lease termination fees are recognized when the fees are determinable, tenant vacancy has occurred, collectability is reasonably assured, we have no continuing obligation to provide services to such former tenants and the payment is not subject to any conditions that must be met or waived. Observatory Revenue Revenues from the sale of Observatory tickets are recognized upon admission or ticket expirations. Deferred revenue related to unused and unexpired tickets as of December 31, 2023 and 2022 was $1.7 million and $1.4 million, respectively, and is included in deferred revenue and other liabilities on the consolidated balance sheets. Gains on Sale/Disposition of Real Estate We record a gain on sale of real estate pursuant to provisions under Accounting Standards Codification (ASC) 610-20, Gains and Losses from the Derecognition of Nonfinancial Assets. Under ASC 610-20, we must first determine whether the transaction is a sale to a customer or non-customer. We do not sell real estate within the ordinary course of our business and therefore, expect that sale transactions will not be contracts with customers. We will next determine whether we would have a controlling financial interest in the property after the sale. If we determine that we do not have a controlling financial interest in the real estate, we would evaluate whether a contract exists under ASC 606 Revenue from Contracts with Customers and whether the buyer has obtained control of the asset that was sold. We recognize the full gain on sale of real estate when the derecognition criteria under ASC 610-20 have been met. Third-Party Management and Other Fees We earn revenue arising from contractual agreements with related party entities for asset and property management services. This revenue is recognized as the related services are performed under the respective agreements in place. Other Revenues and Fees Other revenues and fees includes parking income, legal, tax and insurance settlements, demand response energy use earnings and sales from our restaurant at the Empire State Building. Advertising and Marketing Costs Advertising and marketing costs are expensed as incurred. The expense for the years ended December 31, 2023, 2022, and 2021 was $10.9 million, $10.8 million and $7.9 million, respectively, and is included within operating expenses in our consolidated statements of operations. Real Estate Properties and Related Intangible Assets Land and buildings and improvements are recorded at cost less accumulated depreciation and amortization. The recorded cost includes cost of acquisitions, development and construction and tenant allowances and improvements. Expenditures for ordinary repairs and maintenance are charged to property operating expense as incurred. Significant replacements and betterments which improve or extend the life of the asset are capitalized. Tenant improvements which improve or extend the life of the asset are capitalized. If a tenant vacates its space prior to the contractual termination of its lease, the unamortized balance of any tenant improvements are written off if they are replaced or have no future value. For developed properties, direct and indirect costs that clearly relate to projects under development are capitalized. Costs include construction costs, professional services such as architectural and legal costs, capitalized interest and direct payroll costs. We begin capitalization when the project is probable. The assets relating to the project are stated at cost and are not depreciated. Once construction is completed and the assets are placed in service, the assets are reclassified to the appropriate asset class and depreciated in accordance with the useful lives as indicated below. Capitalization of interest ceases when the asset is ready for its intended use, which is generally near the date that a certificate of occupancy is obtained. There was no capitalized interest for the years ended December 31, 2023 and 2022. Depreciation and amortization are computed using the straight-line method for financial reporting purposes. Buildings and improvements are depreciated over the shorter of 39 years, the useful life, or the remaining term of any leasehold interest. Tenant improvement costs, which are included in building and improvements in the consolidated balance sheets, are depreciated over the shorter of (i) the related remaining lease term or (ii) the life of the improvement. Corporate and other equipment is depreciated over three Acquisitions of properties are accounted for utilizing the acquisition method and accordingly the purchase cost is allocated to tangible and intangible assets and liabilities based on their fair values. The fair value of tangible assets acquired is determined by valuing the property as if it were vacant, applying methods similar to those used by independent appraisers of income-producing property. The resulting value is then allocated to land, buildings and improvements, and tenant improvements based on our determination of the fair value of these assets. The assumptions used in the allocation of fair values to assets acquired are based on our best estimates at the time of evaluation. Fair value is assigned to above-market and below-market leases based on the difference between (a) the contractual amounts to be paid by the tenant based on the existing lease and (b) our estimate of current market lease rates for the corresponding in-place leases, over the remaining terms of the in-place leases. Capitalized above-market lease amounts are amortized as a decrease to rental revenue over the remaining terms of the respective leases. Capitalized below-market lease amounts are amortized as an increase to rental revenue over the remaining terms of the respective leases. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The aggregate value of other acquired intangible assets consists of acquired ground leases and acquired in-place leases and tenant relationships. The fair value allocated to acquired in-place leases consists of a variety of components including, but not necessarily limited to: (a) the value associated with avoiding the cost of originating the acquired in-place leases (i.e. the market cost to execute a lease, including leasing commissions, if any); (b) the value associated with lost revenue related to tenant reimbursable operating costs estimated to be incurred during the assumed lease-up period (i.e. real estate taxes, insurance and other operating expenses); (c) the value associated with lost rental revenue from existing leases during the assumed lease-up period; and (d) the value associated with any other inducements to secure a tenant lease. We assess the potential for impairment of our long-lived assets, including real estate properties, annually or whenever events occur or a change in circumstances indicate that the recorded value might not be fully recoverable. We determine whether impairment in value has occurred by comparing the estimated future undiscounted cash flows expected from the use and eventual disposition of the asset to its carrying value. If the undiscounted cash flows do not exceed the carrying value, the real estate is adjusted to fair value and an impairment loss is recognized. Assets held for sale are recorded at the lower of cost or fair value less costs to sell and depreciation expense is no longer recorded. During the fourth quarter 2021, we concluded that the cost basis of 383 Main Avenue, Norwalk, Connecticut exceeded its fair value when we reduced our hold period given our intent to transfer property ownership to the lender. As such, we incurred a $7.7 million i mpairment charge in the year ended December 31, 2021. Our methodology to calculate the fair value of the property involved a combination of the discounted cash flow method, utilizing Level 3 unobservable inputs such as market capitalization rates obtained from external sources, and the market-based approach utilizing recent sales comparables. In April 2022, we transferred this asset back to the lender in a consensual foreclosure. Refer to Note 3 Acquisitions and Dispositions. We do not believe that the value of any of our other properties and intangible assets were impaired during the years ended December 31, 2023, 2022 and 2021. Cash and Cash Equivalents Cash and cash equivalents consist of cash on hand, government money markets, demand deposits with financial institutions and short-term liquid investments with original maturities of three months or less when purchased. Cash and cash equivalents held at major commercial banks may at times exceed the Federal Deposit Insurance Corporation limit. To date, we have not experienced any losses on our invested cash. Restricted Cash Restricted cash consists of amounts held for tenants in accordance with lease agreements such as security deposits and amounts held by lenders and/or escrow agents to provide for future real estate tax expenditures and insurance expenditures, tenant vacancy related costs and debt service obligations. Short-term Investments Short-term investments include time deposits with original maturities of greater than three months and remaining maturities of less than one year. Tenant and Other Receivables Tenant and other receivables, other than deferred rent receivable, are generally expected to be collected within one year. Deferred Leasing Costs Deferred leasing costs consist of fees incurred to initiate and renew leases, are amortized on a straight-line basis over the related lease term and the expense is included in depreciation and amortization in our consolidated statements of income. Upon the early termination of a lease, unamortized deferred leasing costs are charged to expense. Deferred Financing Costs Fees and costs incurred to obtain long-term financing have been deferred and are amortized as a component of interest expense in our consolidated statements of income over the life of the respective long-term financing on the straight-line method which approximates the effective interest method. Unamortized deferred financing costs are expensed when the associated debt is refinanced or repaid before maturity. Costs incurred in seeking debt, which do not close, are expensed in the period in which it is determined that the financing will not close. Equity Method Investments We account for investments under the equity method of accounting where we do not have control but have the ability to exercise significant influence. Under this method, investments are recorded at cost, and the investment accounts are adjusted for our share of the entities’ income or loss and for distributions and contributions. Equity income (loss) is allocated based on the portion of the ownership interest that is controlled by us. The agreements may designate different percentage allocations among investors for profits and losses; however, our recognition of the entity’s income or loss generally follows the entity’s distribution priorities, which may change upon the achievement of certain investment return thresholds. To the extent that we contributed assets to an entity, our investment in the entity is recorded at cost basis in the assets that were contributed to the entity. Upon contributing assets to an entity, we make a judgment as to whether the economic substance of the transaction is a sale. In accordance with the provisions of ASC 610-20, we will recognize a full gain on both the retained and sold portions of real estate contributed or sold to an entity by recognizing our new equity method investment interest at fair value. To the extent that the carrying amount of these investments on our combined balance sheets is different than the basis reflected at the entity level, the basis difference would be amortized over the life of the related asset and included in our share of equity in net income of the entity. On a periodic basis, we assess whether there are any indicators that the carrying value of our investments in entities may be impaired on an other than temporary basis. An investment is impaired only if management’s estimate of the fair value of the investment is less than the carrying value of the investment on an other than temporary basis. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying value of the investment over the fair value of the investment. As of December 31, 2023 and 2022, we had no equity method investments. Goodwill Goodwill is tested annually for impairment and more frequently if events and circumstances indicate that the asset might be impaired. An impairment loss is recognized to the extent that the carrying amount, including goodwill, exceeds the reporting unit’s fair value and the implied fair value of goodwill is less than the carrying amount of that goodwill. Non-amortizing intangible assets, such as trade names and trademarks, are subject to an annual impairment test based on fair value and amortizing intangible assets are tested whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Fair Value Fair value is a market-based measurement, not an entity-specific measurement, and should be determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair value measurements, the FASB guidance establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within levels one and two of the hierarchy) and the reporting entity's own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). The methodologies used for valuing financial instruments have been categorized into three broad levels as follows: Level 1 - Quoted prices in active markets for identical instruments. Level 2 - Valuations based principally on other observable market parameters, including: • Quoted prices in active markets for similar instruments; • Quoted prices in less active or inactive markets for identical or similar instruments; • Other observable inputs (such as risk free interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates); and • Market corroborated inputs (derived principally from or corroborated by observable market data). Level 3 - Valuations based significantly on unobservable inputs, including: • Valuations based on third-party indications (broker quotes or counterparty quotes) which were, in turn, based significantly on unobservable inputs or were otherwise not supportable; and • Valuations based on internal models with significant unobservable inputs. These levels form a hierarchy. We follow this hierarchy for our financial instruments measured or disclosed at fair value on a recurring and nonrecurring basis and other required fair value disclosures. The classifications are based on the lowest level of input that is significant to the fair value measurement. We use the following methods and assumptions in estimating fair value disclosures for financial instruments. Cash and cash equivalents, restricted cash, short term investments, tenant and other receivables, prepaid expenses and other assets, deferred revenue, tenant security deposits, accounts payable and accrued expenses carrying values approximate their fair values due to the short term maturity of these instruments. The fair value of derivative instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Although the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by ourselves and our counterparties. The impact of such credit valuation adjustments, determined based on the fair value of each individual contract, was not significant to the overall valuation. As a result, all of our derivatives were classified as Level 2 of the fair value hierarchy. The fair value of our mortgage notes payable, senior unsecured notes (Series A, B, C, D, E, F, G and H), unsecured term loan facilities and unsecured revolving credit facility which are determined using Level 3 inputs are estimated by discounting the future cash flows using current interest rates at which similar borrowings could be made by us. Derivative Instruments We are exposed to the effect of interest rate changes and manage these risks by following policies and procedures including the use of derivatives. To manage exposure to interest rates, derivatives are used primarily to fix the rate on debt based on floating-rate indices. We record all derivatives on the balance sheet at fair value. We incorporate credit valuation adjustments to appropriately reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. We measure the credit risk of our derivative instruments that are subject to master netting agreements on a net basis by counterparty portfolio. For derivatives that qualify as cash flow hedges, we report the gain or loss on the derivative designated as a hedge as part of other comprehensive income (loss) and subsequently reclassify the gain or loss into income in the period that the hedged transaction affects income. Income Taxes We are generally not subject to federal and state income taxes as our taxable income or loss is reportable by our partners. Accordingly, no provision has been made for federal and state income taxes. ESRT has elected, together with ESRT Observatory TRS, L.L.C., our subsidiary that holds our Observatory operations, to treat ESRT Observatory TRS, L.L.C. as a TRS. ESRT has elected, together with ESRT Holdings TRS, L.L.C., our subsidiary that holds our third-party management, restaurant, cafeterias, health clubs and certain cleaning operations, to treat ESRT Holdings TRS, L.L.C. as a TRS. TRSs may participate in non-real estate activities and/or perform non-customary services for tenants and their operations are generally subject to regular corporate income taxes. Our TRSs account for their income taxes in accordance with GAAP, which includes an estimate of the amount of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our consolidated financial statements or tax returns. The calculation of the TRSs' tax provisions may require interpreting tax laws and regulations and could result in the use of judgments or estimates which could cause its recorded tax liability to differ from the actual amount due. Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The TRSs periodically assess the realizability of deferred tax assets and the adequacy of deferred tax liabilities, including the results of local, state, or federal statutory tax audits or estimates and judgments used. We apply provisions for measuring and recognizing tax benefits associated with uncertain income tax positions. Penalties and interest, if incurred, would be recorded as a component of income tax expense. As of December 31, 2023 and 2022, we do not have a liability for uncertain tax positions. As of December 31, 2023, the tax years ended December 31, 2020 through December 31, 2023 remain open for an audit by the Internal Revenue Service, state or local authorities. Share-Based Compensation Share-based compensation for time-based equity awards is measured at the fair value of the award on the date of grant and recognized as an expense on a straight-line basis over the shorter of (i) the stated vesting period, which is generally three four three The determination of fair value of these awards is subjective and involves significant estimates and assumptions including expected volatility of ESRT stock, expected dividend yield, expected term, and assumptions of whether these awards will achieve parity with other operating partnership units or achieve performance thresholds. We believe that the assumptions and estimates utilized are appropriate based on the information available to management at the time of grant. Per Unit Data Basic and diluted earnings per unit are computed based upon the weighted average number of shares outstanding during the respective period. Segment Reporting We have identified two reportable segments: (1) Real Estate and (2) Observatory. Our real estate segment includes all activities related to the ownership, management, operation, acquisition, repositioning and disposition of our real estate assets. Our Observatory segment operates the 86th and 102nd floor observatories at the Empire State Building. These two lines of businesses are managed separately because each business requires different support infrastructures, provides different services and has dissimilar economic characteristics such as investments needed, stream of revenues and different marketing strategies. We account for intersegment sales and rent as if the sales or rent were to third parties, that is, at current market prices. Recently Issued or Adopted Accounting Standards During March 2020, the FASB issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848). ASU 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance in ASU 2020-04 is optional and may be elected over time as reference rate reform activities occur. During the first quarter 2020, we elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives consistent with past presentation. In December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848) Deferral of the Sunset Date of Topic 848 which deferred the sunset date of ASU 2022-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform to December 31, 2024. As of December 31, 2023, we have transitioned all of our LIBOR-indexed debt and derivatives to SOFR and applied the practical expedient allowed under the guidance. During November 2023, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU") No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, to improve the disclosures about reportable segments and add more detailed information about a reportable segment’s expenses. The amendments in the ASU require public entities to disclose on an annual and interim basis significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss, other segment items and a description of its composition by reportable segment, the title and position of the CODM, and an explanation of how the CODM uses the reported measures of segment profit or loss in assessing segment performance and deciding how to allocate resources. The ASU does not change the definition of a segment, the method for determining segments, the criteria for aggregating operating segments into reportable segments, or the current specifically enumerated segment expenses that are required to be disclosed. The amendments in this ASU are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

Acquisitions and Dispositions

Acquisitions and Dispositions	12 Months Ended
	Dec. 31, 2023
Business Combination and Dispositions [Abstract]
Acquisitions and Dispositions	Acquisitions and Dispositions Property Acquisitions On September 14, 2023, we closed on the acquisition of a retail property in Williamsburg, Brooklyn, located on the corner of North 6 th Street and Wythe Avenue for a purchase price of $26.4 million. The property has three retail tenants and six residential units and was fully leased as of December 31, 2023. The transaction was executed as an exchange under Section 1031 of the Internal Revenue Code of 1986, as amended. The purchase price is the fair value at the date of acquisition. On December 20, 2022, we closed on the acquisition of a multifamily asset located at 298 Mulberry Street in Manhattan for a purchase price of $114.9 million. In addition to the 96 residential units, the property also contains retail space leased to CVS and a garage. The purchase price is the fair value at the date of acquisition. On December 22, 2021, we acquired 90% of two multifamily assets located in Manhattan, the Victory (561 10th Avenue) and 345 East 94th Street. The total transaction value was $307.0 million, inclusive of $134.0 million of debt on the Victory, that matures in 2033 and has an effective interest rate of 3.85%, and $52.0 million of debt on 345 East 94th Street, that matures in 2030 and has an effective interest rate of 3.56%. The previous owner retained a 10% equity stake. We asset manage the properties and have control over all decision making through our voting interests in each entity. We currently use a third-party manager, but we have the right to assume day-to-day property management for no additional consideration. The fair value of the non-controlling interest was equivalent to 10% of the gross purchase price less the pro-rata share of the debt assumed. The purchase price of the non-controlling interest is its fair value at the date of acquisition. The Victory is a 417 unit, 45-story apartment building with an 11,000 square foot retail space leased to CVS through 2040. It is a participant in an extendable 421a tax abatement program. 345 East 94th Street is a 208 unit, 30-story, apartment building. It is a participant in an extendable 421a tax abatement program. The following table summarizes properties acquired during the years ended December 31, 2023, 2022 and 2021 (amounts in thousands): Intangibles Property Date Acquired Land Building and Improvements Assets Liabilities Total* Williamsburg Retail, Brooklyn 9/14/2023 $ 4,851 $ 20,936 $ 1,573 $ (300) $ 27,060 298 Mulberry Street, Manhattan 12/20/2022 $ 40,935 $ 69,508 $ 5,300 $ (150) $ 115,593 The Victory 12/21/2021 91,437 124,997 13,573 (19,895) $ 210,112 345 East 94th St. 12/21/2021 44,228 55,766 4,824 (5,491) $ 99,327 *Includes total capitalized transaction costs of $3.8 million. Property Dispositions The following table summarizes properties disposed of during the years ended December 31, 2023 and 2022 (amounts in thousands): Property Date of Disposal Sales Price Gain on Disposition 500 Mamaroneck Avenue, Harrison, New York* 4/5/2023 $ 53,000 $ 11,075 69-97 and 103-107 Main Street, Westport, Connecticut 2/1/2023 $ 40,000 $ 15,689 10 Bank Street, White Plains, New York 12/7/2022 $ 42,000 $ 6,818 383 Main Avenue, Norwalk, Connecticut** 4/1/2022 $ 30,000 $ 27,170 *The gain is net of approximately $4.5 million of post-closing costs we accrued related to expected contaminated soil remediation costs and our commitment to reimburse the buyer for a delay in rent commencement from a tenant impacted by the soil remediation efforts. Subsequent to December 31, 2023, we funded the buyer for these costs and we have no further obligations or contingencies that relate to this property. **We transferred the property, which was encumbered by a $30.0 million mortgage, back to the lender in a consensual foreclosure and recognized a non-cash gain upon the disposition. There were no property dispositions for the year ended December 31, 2021.

Deferred Costs, Acquired Lease

Deferred Costs, Acquired Lease Intangibles and Goodwill	12 Months Ended
	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred Costs, Acquired Lease Intangibles and Goodwill	Deferred Costs, Acquired Lease Intangibles and Goodwill Deferred costs, net, consisted of the following at December 31, 2023 and 2022 (amounts in thousands): 2023 2022 Leasing costs $ 224,295 $ 218,707 Acquired in-place lease value and deferred leasing costs 158,267 160,683 Acquired above-market leases 23,918 27,833 406,480 407,223 Less: accumulated amortization (236,900) (223,246) Total deferred costs, net, excluding net deferred financing costs $ 169,580 $ 183,977 At December 31, 2023 and 2022, $2.9 million and $5.0 million, respectively, of net deferred financing costs associated with the unsecured revolving credit facility was included in deferred costs, net on the consolidated balance sheets. Amortization expense related to deferred leasing and acquired deferred leasing costs was $23.6 million, $25.4 million, and $28.6 million, for the years ended December 31, 2023, 2022, and 2021, respectively. Amortization expense related to acquired lease intangibles was $7.4 million, $11.8 million and $10.5 million for the years ended December 31, 2023, 2022 and 2021, respectively. Amortizing acquired intangible assets and liabilities consisted of the following at December 31, 2023 and 2022 (amounts in thousands): 2023 2022 Acquired below-market ground leases $ 396,916 $ 396,916 Less: accumulated amortization (75,675) (67,843) Acquired below-market ground leases, net $ 321,241 $ 329,073 2023 2022 Acquired below-market leases $ (55,155) $ (64,656) Less: accumulated amortization 41,405 46,807 Acquired below-market leases, net $ (13,750) $ (17,849) Rental revenue related to the amortization of below market leases, net of above market leases was $2.4 million, $4.8 million and $5.9 million for the years ended December 31, 2023, 2022 and 2021, respectively. The remaining weighted-average amortization period as of December 31, 2023 is 22.2 years, 3.4 years, 3.5 years and 2.9 years for below-market ground leases, in-place leases and deferred leasing costs, above-market leases and below-market leases, respectively. We expect to recognize amortization expense and rental revenue from the acquired intangible assets and liabilities as follows (amounts in thousands): For the year ending: Future Ground Rent Amortization Future Amortization Expense Future Rental Revenue (Expense) 2024 $ 7,831 $ 7,430 $ 1,977 2025 7,831 6,481 1,914 2026 7,831 5,593 1,116 2027 7,831 4,930 882 2028 7,831 4,297 854 Thereafter 282,086 4,110 (124) $ 321,241 $ 32,841 $ 6,619 As of December 31, 2023, we had goodwill of $491.5 million. In 2013, we acquired the interests in Empire State Building Company, L.L.C. and 501 Seventh Avenue Associates, L.L.C. for an amount in excess of their net tangible and identified intangible assets and liabilities and as a result we recorded goodwill related to the transaction. Goodwill was allocated $227.5 million to the Observatory operations of the Empire State Building, $250.8 million to Empire State Building, and $13.2 million to 501 Seventh Avenue. We performed our annual goodwill testing in October 2023, where we bypassed the optional qualitative goodwill impairment assessment and proceeded directly to a quantitative assessment of the Observatory reportable segment and engaged a third-party valuation consulting firm to perform the valuation process. The quantitative analysis used a combination of the discounted cash flow method (a form of the income approach) utilizing Level 3 unobservable inputs and the guideline company method (a form of the market approach). Significant assumptions under the former included revenue and cost projections, weighted average cost of capital, long-term growth rate and income tax considerations while the latter included guideline company enterprise values, revenue multiples, EBITDA multiples and control premium rates. Our methodology to review goodwill impairment, which included a significant amount of judgment and estimates, provided a reasonable basis to determine whether impairment had occurred. The quantitative analysis performed concluded the fair value of the reporting unit exceeds its carrying value. Many of the factors employed in determining whether or not goodwill is impaired are outside of our control, and it is reasonably likely that assumptions and estimates will change in future periods. We will continue to assess the impairment of the Observatory reporting unit goodwill going forward.

Debt

Debt	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Debt	Debt Debt consisted of the following as of December 31, 2023 and 2022 (amounts in thousands): As of December 31, 2023 Principal Balance as Principal Balance as Stated Effective (1) Maturity (2) Fixed rate mortgage debt Metro Center $ 80,070 $ 82,596 3.59 % 3.67 % 11/5/2024 10 Union Square 50,000 50,000 3.70 % 3.97 % 4/1/2026 1542 Third Avenue 30,000 30,000 4.29 % 4.53 % 5/1/2027 First Stamford Place (3) 175,860 178,823 4.28 % 4.73 % 7/1/2027 1010 Third Avenue and 77 West 55th Street 34,958 35,831 4.01 % 4.21 % 1/5/2028 250 West 57th Street 180,000 180,000 2.83 % 3.21 % 12/1/2030 1333 Broadway 160,000 160,000 4.21 % 4.29 % 2/5/2033 345 East 94th Street - Series A 43,600 43,600 70.0% of SOFR plus 0.95% 3.56 % 11/1/2030 345 East 94th Street - Series B 7,209 7,865 SOFR plus 2.24% 3.56 % 11/1/2030 561 10th Avenue - Series A 114,500 114,500 70.0% of SOFR plus 1.07% 3.85 % 11/1/2033 561 10th Avenue - Series B 15,801 17,415 SOFR plus 2.45% 3.85 % 11/1/2033 Total fixed rate mortgage debt 891,998 900,630 Senior unsecured notes: (4) Series A 100,000 100,000 3.93 % 3.96 % 3/27/2025 Series B 125,000 125,000 4.09 % 4.12 % 3/27/2027 Series C 125,000 125,000 4.18 % 4.21 % 3/27/2030 Series D 115,000 115,000 4.08 % 4.11 % 1/22/2028 Series E 160,000 160,000 4.26 % 4.27 % 3/22/2030 Series F 175,000 175,000 4.44 % 4.45 % 3/22/2033 Series G 100,000 100,000 3.61 % 4.89 % 3/17/2032 Series H 75,000 75,000 3.73 % 5.00 % 3/17/2035 Unsecured revolving credit facility (4) — — SOFR plus 1.30% — % 3/31/2025 Unsecured term loan facility (4) 215,000 215,000 SOFR plus 1.20% 4.22 % 3/19/2025 Unsecured term loan facility (4) 175,000 175,000 SOFR plus 1.50% 4.51 % 12/31/2026 Total principal 2,256,998 2,265,630 Deferred financing costs, net (9,488) (11,748) Unamortized debt discount (6,964) (7,745) Total $ 2,240,546 $ 2,246,137 _____________ (1) The effective rate is the yield as of December 31, 2023 and includes the stated interest rate, deferred financing cost amortization and interest associated with variable to fixed interest rate swap agreements. (2) Pre-payment is generally allowed for each loan upon payment of a customary pre-payment penalty. (3) Represents a $164.0 million mortgage loan bearing interest of 4.09% and a $11.9 million loan bearing interest at 6.25%. (4) At December 31, 2023, we were in compliance with all debt covenants. Principal Payments Aggregate required principal payments at December 31, 2023 are as follows (amounts in thousands): Year Amortization Maturities Total 2024 $ 8,861 $ 77,675 $ 86,536 2025 6,893 315,000 321,893 2026 7,330 225,000 232,330 2027 6,461 319,000 325,461 2028 3,556 146,092 149,648 Thereafter 18,523 1,122,607 1,141,130 Total principal maturities $ 51,624 $ 2,205,374 $ 2,256,998 Deferred Financing Costs Deferred financing costs, net, consisted of the following at December 31, 2023 and 2022 (amounts in thousands): 2023 2022 Financing costs $ 43,473 $ 43,473 Less: accumulated amortization (31,108) (26,753) Total deferred financing costs, net $ 12,365 $ 16,720 Amortization expense related to deferred financing costs was $4.4 million, $4.9 million, and $4.5 million, for the years ended December 31, 2023, 2022 and 2021, respectively, and was included in interest expense. Unsecured Revolving Credit and Term Loan Facilities On August 29, 2022, we entered into a third amendment to our amended and restated credit agreement dated August 29, 2017 with Bank of America, N.A., as administrative agent and the other lenders party thereto, which governs our senior unsecured revolving credit facility and term loan facility (collectively, the “BofA Credit Facility”). The BofA Credit Facility is in the initial maximum principal amount of up to $1.065 billion, which consists of a $850.0 million revolving credit facility that matures on March 31, 2025, and a $215.0 million term loan facility that matures on March 19, 2025. The third amendment revised the terms of the BofA Credit Facility to (i) replace LIBOR with SOFR given the phase out of LIBOR and (ii) permit the addition of multifamily assets as Unencumbered Eligible Property (as defined therein) and add a capitalization rate for such assets. As of December 31, 2023 , we had no borrowings under the revolving credit facility and $215.0 million under the term loan facility. On August 29, 2022, we entered into a second amendment to our credit agreement dated March 19, 2020 with Wells Fargo Bank, National Association, as administrative agent, and the other lenders party thereto, which governs a senior unsecured term loan facility (the “Wells Term Loan Facility”). The Wells Term Loan Facility is in the original principal amount of $175 million and matures on December 31, 2026. The second amendment revised the terms of the Wells Term Loan Facility to (i) replace LIBOR with SOFR given the phase out of LIBOR and (ii) permit the addition of multifamily assets as Unencumbered Eligible Property (as defined therein) and add a capitalization rate for such assets. We may request the Wells Term Loan Facility be increased through one or more increases or the addition of new pari passu term loan tranches, for a maximum aggregate principal amount not to exceed $225 million. As of December 31, 2023 , our borrowings amounted to $175.0 million under the Wells Term Loan Facility. The terms of both the BofA Credit Facility and the Wells Term Loan Facility include customary covenants, including limitations on liens, investment, distributions, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. Both facilities also require compliance with financial ratios including a maximum leverage ratio, a maximum secured leverage ratio, a minimum fixed charge coverage ratio, a minimum unencumbered interest coverage ratio, and a maximum unsecured leverage ratio. The agreements governing both facilities also contain customary events of default (subject in certain cases to specified cure periods), including but not limited to non-payment, breach of covenants, representations or warranties, cross defaults, bankruptcy or other insolvency events, judgments, ERISA events, invalidity of loan documents, loss of real estate investment trust qualification, and occurrence of a change of control. As of December 31, 2023, we were in compliance with these covenants. Senior Unsecured Notes The terms of the senior unsecured notes include customary covenants, including limitations on liens, investment, distributions, debt, fundamental changes, and transactions with affiliates and require certain customary financial reports. It also requires compliance with financial ratios including a maximum leverage ratio, a maximum secured leverage ratio, a minimum fixed charge coverage ratio, a minimum unencumbered interest coverage ratio, and a maximum unsecured leverage ratio. The agreements also contain customary events of default (subject in certain cases to specified cure periods), including but not limited to non-payment, breach of covenants, representations or warranties, cross defaults, bankruptcy or other insolvency events, judgments, ERISA events, the occurrence of certain change of control transactions and loss of real estate investment trust qualification. As of December 31, 2023, we were in compliance with these covenants.

Accounts Payable and Accrued Ex

Accounts Payable and Accrued Expenses	12 Months Ended
	Dec. 31, 2023
Payables and Accruals [Abstract]
Accounts Payable and Accrued Expenses	Accounts Payable and Accrued Expenses Accounts payable and accrued expenses consist of the following as of December 31, 2023 and 2022 (amounts in thousands): 2023 2022 Accrued capital expenditures $ 51,815 $ 44,293 Accounts payable and accrued expenses 44,169 32,927 Interest rate swap agreements liability 85 — Accrued interest payable 3,687 3,509 Total accounts payable and accrued expenses $ 99,756 $ 80,729

Financial Instruments and Fair

Financial Instruments and Fair Values	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Financial Instruments and Fair Values	Financial Instruments and Fair Values Derivative Financial Instruments We use derivative financial instruments primarily to manage interest rate risk and such derivatives are not considered speculative. These derivative instruments are typically in the form of interest rate swap and forward agreements, and the primary objective is to minimize interest rate risks associated with investing and financing activities. The counterparties of these arrangements are major financial institutions with which we may also have other financial relationships. We are exposed to credit risk in the event of non-performance by these counterparties; however, we currently do not anticipate that any of the counterparties will fail to meet their obligations. We have agreements with our derivative counterparties that contain a provision where if we either default or are capable of being declared in default on any of our indebtedness, then we could also be declared in default on our derivative obligations. As of December 31, 2023, the fair value of derivatives in a net liability position, which includes accrued interest but excludes any adjustment for nonperformance risk, related to these agreements was $0.1 million. If we had breached any of these provisions at December 31, 2023, we could have been required to settle our obligations under the agreements at their termination value of $0.1 million. As of December 31, 2023 and 2022, we had interest rate swaps and caps with an aggregate notional value of $573.2 million and $574.8 million, respectively. The notional value does not represent exposure to credit, interest rate or market risks. As of December 31, 2023, the fair values of our derivative instruments amounted to $11.8 million which is included in prepaid expenses and other assets, and ($0.1 million) which is included in accounts payable and accrued expenses on the consolidated balance sheet. As of December 31, 2022, the fair value of our derivative instruments amounted to $17.9 million which is included in prepaid expenses and other assets on the consolidated balance sheet. These interest rate swaps have been designated as cash flow hedges and hedge the variability in future cash flows associated with our existing variable-rate term loan facilities. Interest rate caps not designated as hedges are not speculative and are used to manage our exposure to interest rate movements, but do not meet the strict hedge accounting requirements. As of December 31, 2023 and 2022, our cash flow hedges are deemed highly effective and for the years ended December 31, 2023 and 2022, net unrealized gains (losses) of $(2.2) million and $47.3 million, respectively, are reflected in the consolidated statements of comprehensive income (loss) relating to both active and terminated cash flow hedges of interest rate risk. Amounts reported in accumulated other comprehensive income (loss) related to derivatives will be reclassified to interest expense as interest payments are made on the debt. We estimate that $5.6 million net gain of the current balance held in accumulated other comprehensive income (loss) will be reclassified into interest expense within the next 12 months. The table below summarizes the terms of agreement and the fair value of our derivative financial instruments as of December 31, 2023 and 2022 (dollar amounts in thousands): December 31, 2023 December 31, 2022 Derivative Notional Amount Receive Rate Pay Rate Effective Date Expiration Date Asset Liability Asset Liability Interest rate swap $ 36,820 70% of 1 Month SOFR 2.5000 % December 1, 2021 November 1, 2030 $ 64 $ — $ 256 $ — Interest rate swap 103,790 70% of 1 Month SOFR 2.5000 % December 1, 2021 November 1, 2033 — (85) 365 — Interest rate swap 10,710 70% of 1 Month SOFR 1.7570 % December 1, 2021 November 1, 2033 546 — 643 — Interest rate swap 15,942 1 Month SOFR 2.2540 % December 1, 2021 November 1, 2030 782 — 1,070 — Interest rate cap 6,780 70% of 1 Month SOFR 4.5000 % December 1, 2021 October 1, 2024 — — 8 — Interest rate cap 9,188 1 Month SOFR 5.5000 % December 1, 2021 October 1, 2024 4 — 26 — Interest rate swap 175,000 SOFR Compound 2.5620 % August 31, 2022 December 31, 2026 5,637 — 8,040 — Interest rate swap 107,500 SOFR Compound 2.6260 % August 19, 2022 March 19, 2025 2,384 — 3,766 — Interest rate swap 107,500 SOFR OIS Compound 2.6280 % August 19, 2022 March 19, 2025 2,383 — 3,762 — $ 11,800 $ (85) $ 17,936 $ — The table below shows the effect of our derivative financial instruments designated as cash flow hedges on accumulated other comprehensive income (loss) for the years ended December 31, 2023, 2022 and 2021 (amounts in thousands): Effects of Cash Flow Hedges December 31, 2023 December 31, 2022 December 31, 2021 Amount of gain recognized in other comprehensive income (loss) $ 5,581 $ 40,044 $ 348 Amount of loss (gain) reclassified from accumulated other comprehensive income (loss) into interest expense 7,819 (7,230) (11,653) The table below shows the effect of our derivative financial instruments designated as cash flow hedges on the consolidated statements of operations for the years ended December 31, 2023, 2022 and 2021 (amounts in thousands): Effects of Cash Flow Hedges December 31, 2023 December 31, 2022 December 31, 2021 Total interest expense presented on the consolidated statements of income in which the effects of cash flow hedges are recorded $ (101,484) (101,206) (94,394) Amount of loss (gain) reclassified from accumulated other comprehensive income (loss) into interest expense 7,819 (7,230) (11,653) Fair Valuation The estimated fair values at December 31, 2023 and 2022 were determined by management, using available market information and appropriate valuation methodologies. Considerable judgment is necessary to interpret market data and develop estimated fair value. Accordingly, the estimates presented herein are not necessarily indicative of the amounts we could realize on disposition of the financial instruments. The use of different market assumptions and/or estimation methodologies may have a material effect on the estimated fair value amounts. The following tables summarize the carrying and estimated fair values of our financial instruments as of December 31, 2023 and 2022 (amounts in thousands): December 31, 2023 Carrying Value Estimated Fair Value Total Level 1 Level 2 Level 3 Interest rate swaps included in prepaid expenses and other assets $ 11,800 $ 11,800 $ — $ 11,800 $ — Interest rate swaps included in accounts payable and accrued expenses 85 85 — 85 — Mortgage notes payable 877,388 774,280 — — 774,280 Senior unsecured notes - Series A, B, C, D, E, F, G and H 973,872 882,242 — — 882,242 Unsecured term loan facilities 389,286 390,000 — — 390,000 December 31, 2022 Carrying Value Estimated Fair Value Total Level 1 Level 2 Level 3 Interest rate swaps included in prepaid expenses and other assets $ 17,936 $ 17,936 $ — $ 17,936 $ — Mortgage notes payable 883,705 783,648 — — 783,648 Senior unsecured notes - Series A, B, C, D, E, F, G and H 973,659 865,292 — — 865,292 Unsecured term loan facility 388,773 390,000 — — 390,000

Leases

Leases	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Leases	Leases Lessor We lease various commercial spaces to tenants over terms ranging from one Rental revenue includes fixed and variable payments. Fixed payments primarily relate to base rent and variable payments primarily relate to tenant expense reimbursements for certain property operating costs. The components of rental revenue for the years ended December 31, 2023, 2022 and 2021 are as follows (amounts in thousands): Year Ended December 31, Rental revenue 2023 2022 2021 Fixed payments $ 529,965 $ 531,740 $ 500,847 Variable payments 67,354 59,308 58,843 Total rental revenue $ 597,319 $ 591,048 $ 559,690 As of December 31, 2023, we were entitled to the following future contractual minimum lease payments (excluding operating expense reimbursements) on non-cancellable operating leases to be received which expire on various dates through 2040 (amounts in thousands): 2024 $ 513,589 2025 499,154 2026 453,645 2027 434,447 2028 395,858 Thereafter 1,646,769 $ 3,943,462 The above future minimum lease payments exclude tenant recoveries and the net accretion of above-market leases and below-market lease intangibles. Some leases are subject to termination options generally upon payment of a termination fee. The preceding table is prepared assuming such options are not exercised. Lessee We determine if an arrangement is a lease at inception. Our operating lease agreements relate to three ground lease assets and are reflected in right-of-use assets of $28.4 million and lease liabilities of $28.4 million in our consolidated balance sheets as of December 31, 2023. Right-of-use assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Right-of-use assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. Variable lease payments are excluded from the right-of-use assets and lease liabilities and are recognized in the period in which the obligation for those payments is incurred. The ground leases are due to expire between the years 2050 and 2077, inclusive of extension options, and have no variable payments or residual value guarantees. As our leases do not provide an implicit rate, we determined our incremental borrowing rate based on information available at the date of adoption of ASU No. 2016-02, Leases (Topic 842), in determining the present value of lease payments. The weighted average incremental borrowing rate used to calculate the right-of-use assets and lease liabilities as of December 31, 2023 was 4.5%. Rent expense for lease payments related to our operating leases is recognized on a straight-line basis over the non-cancellable term of the leases. The weighted average remaining lease term as of December 31, 2023 was 46.5 years. As of December 31, 2023, the following table summarizes our future minimum lease payments discounted by our incremental borrowing rates to calculate the lease liabilities of our leases (amounts in thousands): 2024 $ 1,518 2025 1,518 2026 1,503 2027 1,482 2028 1,482 Thereafter 60,795 Total undiscounted lease payments 68,298 Present value discount (39,859) Ground lease liabilities $ 28,439
Leases	Leases Lessor We lease various commercial spaces to tenants over terms ranging from one Rental revenue includes fixed and variable payments. Fixed payments primarily relate to base rent and variable payments primarily relate to tenant expense reimbursements for certain property operating costs. The components of rental revenue for the years ended December 31, 2023, 2022 and 2021 are as follows (amounts in thousands): Year Ended December 31, Rental revenue 2023 2022 2021 Fixed payments $ 529,965 $ 531,740 $ 500,847 Variable payments 67,354 59,308 58,843 Total rental revenue $ 597,319 $ 591,048 $ 559,690 As of December 31, 2023, we were entitled to the following future contractual minimum lease payments (excluding operating expense reimbursements) on non-cancellable operating leases to be received which expire on various dates through 2040 (amounts in thousands): 2024 $ 513,589 2025 499,154 2026 453,645 2027 434,447 2028 395,858 Thereafter 1,646,769 $ 3,943,462 The above future minimum lease payments exclude tenant recoveries and the net accretion of above-market leases and below-market lease intangibles. Some leases are subject to termination options generally upon payment of a termination fee. The preceding table is prepared assuming such options are not exercised. Lessee We determine if an arrangement is a lease at inception. Our operating lease agreements relate to three ground lease assets and are reflected in right-of-use assets of $28.4 million and lease liabilities of $28.4 million in our consolidated balance sheets as of December 31, 2023. Right-of-use assets represent our right to use an underlying asset for the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. Right-of-use assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. Variable lease payments are excluded from the right-of-use assets and lease liabilities and are recognized in the period in which the obligation for those payments is incurred. The ground leases are due to expire between the years 2050 and 2077, inclusive of extension options, and have no variable payments or residual value guarantees. As our leases do not provide an implicit rate, we determined our incremental borrowing rate based on information available at the date of adoption of ASU No. 2016-02, Leases (Topic 842), in determining the present value of lease payments. The weighted average incremental borrowing rate used to calculate the right-of-use assets and lease liabilities as of December 31, 2023 was 4.5%. Rent expense for lease payments related to our operating leases is recognized on a straight-line basis over the non-cancellable term of the leases. The weighted average remaining lease term as of December 31, 2023 was 46.5 years. As of December 31, 2023, the following table summarizes our future minimum lease payments discounted by our incremental borrowing rates to calculate the lease liabilities of our leases (amounts in thousands): 2024 $ 1,518 2025 1,518 2026 1,503 2027 1,482 2028 1,482 Thereafter 60,795 Total undiscounted lease payments 68,298 Present value discount (39,859) Ground lease liabilities $ 28,439

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings Litigation Except as described below, as of December 31, 2023, we were not involved in any material litigation, nor, to our knowledge, was any material litigation threatened against us or our properties, other than routine litigation arising in the ordinary course of business such as disputes with tenants. We believe that the costs and related liabilities, if any, which may result from such actions will not materially affect our consolidated financial position, operating results or liquidity. As previously disclosed, in October 2014, 12 former investors (the "Claimants") in Empire State Building Associates L.L.C. (“ESBA”), which prior to the initial public offering of our Company (the "Offering"), owned the fee title to the Empire State Building, filed an arbitration with the American Arbitration Association against Peter L. Malkin, Anthony E. Malkin, Thomas N. Keltner, Jr., and our subsidiary ESRT MH Holdings LLC, the former supervisor of ESBA, (the "Respondents"). The statement of claim (also filed later in federal court in New York for the expressed purpose of tolling the statute of limitations) alleged breach of fiduciary duty and related claims in connection with the Offering and formation transactions and sought monetary damages and declaratory relief. Claimants had opted out of a prior class action bringing similar claims that was settled with court approval. Respondents filed an answer and counterclaims. In March 2015, the federal court action was stayed on consent of all parties pending the arbitration. Arbitration hearings started in May 2016 and concluded in August 2018. On August 26, 2020, the arbitration panel issued an award that denied all Claimants’ claims with one exception, on which it awarded Claimants approximately $1.2 million, inclusive of seven years of interest through October 2, 2020. This amount was recorded as an IPO litigation expense in the consolidated statement of operations for the year ended December 31, 2020. Respondents believe that such award in favor of the Claimants is entirely without merit and sought to vacate that portion of the award. On September 27, 2021, a federal district court denied Respondents' petition to vacate and entered judgement in the aforementioned amount, inclusive of accumulated interest. Respondents appealed that ruling. On May 10, 2022, Respondents moved to dismiss the appeal and judgment on the grounds that a recent decision of the United States Supreme Court held that the federal courts have no subject matter jurisdiction over the case. On April 20, 2023, the federal appeals court granted the motion and the federal court action challenging the award was dismissed. On April 21, 2023, the Respondents filed a petition to vacate in part and otherwise confirm in New York State court. On April 28, 2023, the Claimants filed a petition to confirm in that same court. On July 31, 2023, the New York State court denied the Respondents’ petition to vacate in part and confirmed the award. On January 22, 2024, that court entered judgment in favor of the Claimants (save for one Claimant, whose petition to confirm is still pending in New York state court) in an amount of approximately $1.26 million, inclusive of interest. The Respondents believe those rulings are incorrect and have appealed them. In addition, certain of the Claimants in the federal court action brought to toll the statute of limitations sought to pursue claims in that case against Respondents. Respondents believe that any such claims are meritless. The magistrate judge assigned to the action issued a Report and Recommendation rejecting Claimants’ claims; the district judge will decide whether to adopt the Report and Recommendation. Pursuant to indemnification agreements which were made with our directors, executive officers and chairman emeritus as part of our formation transactions, Anthony E. Malkin, Peter L. Malkin and Thomas N. Keltner, Jr. have defense and indemnity rights from us with respect to this arbitration. Unfunded Capital Expenditures At December 31, 2023, we estimate that we will incur approximately $101.2 million of capital expenditures (including tenant improvements and leasing commissions) on our properties pursuant to existing lease agreements. We expect to fund these capital expenditures with operating cash flow, cash on hand and other borrowings. Future property acquisitions may require substantial capital investments for refurbishment and leasing costs. We expect that these financing requirements will be met in a similar fashion. Concentration of Credit Risk Financial instruments that subject us to credit risk consist primarily of cash and cash equivalents, restricted cash, short-term investments, tenant and other receivables and deferred rent receivables. At December 31, 2023, we held on deposit at various major financial institutions cash and cash equivalents and restricted cash balances in excess of amounts insured by the Federal Deposit Insurance Corporation . Real Estate Investments Our properties are located in Manhattan and Brooklyn, New York; and Stamford, Connecticut. The ability of the tenants to honor the terms of their respective leases is dependent upon the economic, regulatory and social factors affecting the markets in which the tenants operate. We perform ongoing credit evaluations of our tenants for potential credit losses. Tenant Credit Evaluations Our investments in real estate properties are subject to risks incidental to the ownership and operation of commercial real estate. These risks include, among others, the risks normally associated with changes in general economic conditions, trends in the real estate industry, creditworthiness of tenants, competition of tenants and customers, changes in tax laws, interest rate levels, the availability and cost of financing, and potential liability under environmental and other laws. We may require tenants to provide some form of credit support such as corporate guarantees and/or other financial guarantees and we perform ongoing credit evaluations of tenants. Although the tenants operate in a variety of industries, to the extent we have a significant concentration of rental revenue from any single tenant, the inability of that tenant to make its lease payments could have an adverse effect on our Company. Major Customers and Other Concentrations For the year ended December 31, 2023, other than four tenants who accounted fo r 6.8%, 2.5%, 2.1%, and 2.1% of rental revenues, no other tenant in our portfolio accounted for more than 2.0% of rental revenues. For the year ended December 31, 2022, other than two tenants who accounted fo r 6.4% and 2.0% of rental revenues, no other tenant in our portfolio accounted for more than 2.0% of rental revenues. For the year ended December 31, 2021, other than four tenants who accounted for 4.6%, 3.3%, 2.8% and 2.1% of rental revenues, no other tenant in our commercial portfolio accounted for more than 2.0% of rental revenues. For the years ended December 31, 2023, 2022 and 2021, the three properties listed below each exceeded 10% of total rental revenues. Year Ended December 31, 2023 2022 2021 Empire State Building 29.6 % 29.9 % 31.7 % One Grand Central Place 12.8 % 12.4 % 12.6 % 111 West 33rd Street 10.8 % 11.2 % 11.3 % Asset Retirement Obligations We are required to accrue costs that we are legally obligated to incur on retirement of our properties which result from acquisition, construction, development and/or normal operation of such properties. Retirement includes sale, abandonment or disposal of a property. Under that standard, a conditional asset retirement obligation represents a legal obligation to perform an asset retirement activity in which the timing and/or method of settlement is conditional on a future event that may or may not be within a company’s control and a liability for a conditional asset retirement obligation must be recorded if the fair value of the obligation can be reasonably estimated. Environmental site assessments and investigations have identified asbestos or asbestos-containing building materials in certain of our properties. As of December 31, 2023, management has no plans to remove or alter these properties in a manner that would trigger federal and other applicable regulations for asbestos removal, and accordingly, the obligations to remove the asbestos or asbestos-containing building materials from these properties have indeterminable settlement dates. As such, we are unable to reasonably estimate the fair value of the associated conditional asset retirement obligation. However ongoing asbestos abatement, maintenance programs and other required documentation are carried out as required and related costs are expensed as incurred. Other Environmental Matters Under various federal, state and/or local laws, ordinances and regulations, as a current or former owner or operator of real property, we may be liable for costs and damages resulting from the presence or release of hazardous substances, waste, or petroleum products at, on, in, under or from such property, including costs for investigation or remediation, natural resource damages, or third-party liability for personal injury or property damage. These laws often impose liability without regard to whether the owner or operator knew of, or was responsible for, the presence or release of such materials, and the liability may be joint and several. Some of our properties have been or may be impacted by contamination arising from current or prior uses of the property or adjacent properties for commercial, industrial or other purposes. Such contamination may arise from spills of petroleum or hazardous substances or releases from tanks used to store such materials. We also may be liable for the costs of remediating contamination at off-site disposal or treatment facilities when we arrange for disposal or treatment of hazardous substances at such facilities, without regard to whether we comply with environmental laws in doing so. The presence of contamination or the failure to remediate contamination on our properties may adversely affect our ability to attract and/or retain tenants, and our ability to develop or sell or borrow against those properties. In addition to potential liability for cleanup costs, private plaintiffs may bring claims for personal injury, property damage or for similar reasons. Environmental laws also may create liens on contaminated sites in favor of the government for damages and costs it incurs to address such contamination. Moreover, if contamination is discovered on our properties, environmental laws may impose restrictions on the manner in which that property may be used or how businesses may be operated on that property. Some of our properties are adjacent to or near other properties which are used for industrial or commercial purposes or have contained or currently contain underground storage tanks used to store petroleum products or other hazardous or toxic substances. Releases from these properties could impact our properties. In addition, some of our properties have previously been used by former owners or tenants for commercial or industrial activities, e.g., gas stations and dry cleaners, and a portion of the Metro Tower site is currently used for automobile parking and was formerly leased to a fueling facility that may release petroleum products or other hazardous or toxic substances at such properties or to surrounding properties. While certain properties contain or contained uses that could have or have impacted our properties, we are not aware of any liabilities related to environmental contamination that we believe will have a material adverse effect on our operations. We have post-closing obligations related to the 69-97 and 103-107 Main Street, Westport, Connecticut properties that we sold in February 2023 to (i) close out a voluntary remediation program at 69-97 Main Street to address residual impacts of prior presence of underground storage tanks and (ii) comply with a consent order issued by the Connecticut Department of Environmental Protection to investigate soil conditions at 103-107 Main Street. We believe any expenses incurred to close out and comply with the remediation program and consent order, respectively, will be immaterial to the results of our operations. Our property situated at 500 Mamaroneck Avenue in Harrison, New York was the subject of a voluntary remedial action work cleanup plan under an agreement with the New York State Department of Environmental Conservation, but we sold this property in April 2023 and the obligations have been transferred to the buyer. Refer to Note 3 Acquisitions and Dispositions. In addition, our properties are subject to various federal, state and local environmental and health and safety laws and regulations. Noncompliance with these laws and regulations could subject us or our tenants to liability. These liabilities could affect a tenant’s ability to make rental payments to us. Moreover, changes in laws could increase the potential costs of compliance with such laws and regulations or increase liability for noncompliance. This may result in significant unanticipated expenditures. We sometimes require our tenants to comply with environmental and health and safety laws and regulations and to indemnify us for any related liabilities in our leases with them. But in the event of the bankruptcy or inability of any of our tenants to satisfy such obligations, we may be required to satisfy such obligations. We are not presently aware of any instances of material non-compliance with environmental or health and safety laws or regulations at our properties, and we believe that we and/or our tenants have all material permits and approvals necessary under current laws and regulations to operate our properties. In addition, we may become subject to new compliance requirements and/or new costs or taxes associated with natural resource or energy usage and related emissions (such as a carbon tax), which could increase our operating costs. In particular, as the owner of large commercial buildings in New York City, we are subject to Local Law 97 passed by the New York City Council in April 2019, which for each such building establishes annual limits for greenhouse gas emissions, requires yearly emissions reports beginning in May 2025, and imposes penalties for emissions above such limits. Based upon our present understanding of the law and calculations related thereto, we expect to pay no fine on any building in our commercial portfolio in the 2024-2029 first period of enforcement. As the owner or operator of real property, we may also incur liability based on various building conditions. For example, environmental site assessments and investigations have identified asbestos or asbestos-containing material ("ACM") in certain of our properties, and it is possible that other properties that we currently own or operate or those we acquire or operate in the future contain, may contain, or may have contained ACM. Environmental and health and safety laws require that ACM be properly managed and maintained and may impose fines or penalties on owners, operators or employers for non-compliance with those requirements. These requirements include special precautions, such as removal, abatement or air monitoring, if ACM would be disturbed during maintenance, redevelopment or demolition of a building, potentially resulting in substantial costs. In addition, we may be subject to liability for personal injury or property damage sustained as a result of releases of ACM into the environment. We are not presently aware of any material liabilities related to building conditions, including any instances of material non-compliance with asbestos requirements or any material liabilities related to asbestos. Our properties may contain or develop harmful mold or suffer from other indoor air quality issues, which could lead to liability for adverse health effects or property damage or costs for remediation. When excessive moisture accumulates in buildings or on building materials, mold growth may occur, particularly if the moisture problem remains undiscovered or is not addressed over a period of time. Some molds may produce airborne toxins or irritants. Indoor air quality issues can also stem from inadequate ventilation, chemical contamination from indoor or outdoor sources, and other biological contaminants such as pollen, viruses and bacteria. Indoor exposure to airborne toxins or irritants above certain levels can be alleged to cause a variety of adverse health effects and symptoms, including allergic or other reactions. As a result, the presence of significant mold or other airborne contaminants at any of our properties could require us to undertake a costly remediation program to contain or remove the mold or other airborne contaminants from the affected property or increase indoor ventilation. In addition, the presence of significant mold or other airborne contaminants could expose us to liability from our tenants, employees of our tenants or others if property damage or personal injury occurs. We are not presently aware of any material adverse indoor air quality issues at our properties. As of December 31, 2023, with the exception of the Westport assets, management believes that there are no obligations related to environmental remediation other than maintaining the affected sites in conformity with the relevant authority’s mandates and filing the required documents. All such maintenance costs are expensed as incurred. However, we cannot be certain that we have identified all environmental liabilities at our properties, that all necessary remediation actions have been or will be undertaken at our properties or that we will be indemnified, in full or at all, in the event that such environmental liabilities arise. Insurance Coverage We carry insurance coverage on our properties of types and in amounts with deductibles that we believe are in line with coverage customarily obtained by owners of similar properties. Multiemployer Pension and Defined Contribution Plans We contribute to a number of multiemployer defined benefit pension plans under the terms of collective bargaining agreements that cover our union-represented employees. The risks of participating in these multiemployer plans are different from single-employer plans in the following respects: • Assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers. • If a participating employer stops contributing to the plan, the unfunded obligations of the plan may be borne by the remaining participating employers. • If we no longer employ union members, we may be required to pay those plans an amount based on the underfunded status of the plan, referred to as a withdrawal liability. We participate in various unions. The union in which we have significant employees and costs is 32BJ. 32BJ We participate in the Building Service 32BJ ("Union") Pension Plan and Health Plan. The Pension Plan is a multi-employer, non-contributory defined benefit pension plan that was established under the terms of collective bargaining agreements between the Service Employees International Union, Local 32BJ, the Realty Advisory Board on Labor Relations, Inc. and certain other employers. This Pension Plan is administered by a joint board of trustees consisting of union trustees and employer trustees and operates under employer identification number 13-1879376. The Pension Plan year runs from July 1 to June 30. Employers contribute to the Pension Plan at a fixed rate on behalf of each covered employee. Separate actuarial information regarding such pension plans is not made available to the contributing employers by the union administrators or trustees, since the plans do not maintain separate records for each reporting unit. On September 28, 2021, the actuary certified that for the plan year beginning July 1, 2021, the Pension Plan was in critical status under the Pension Protection Act of 2006. The Pension Plan trustees adopted a rehabilitation plan consistent with this requirement. However, on September 28, 2022 and September 28, 2023, the actuary certified that for the plan year beginning July 1, 2022 and July 1, 2023, respectively, the Pension Plan was in endangered status under the Pension Protection Act of 2006. The Pension Plan trustees adopted a funding improvement plan consistent with this requirement. For the plan years ended June 30, 2021, 2022 and 2023, the Pension Plan received contributions from employers totaling $290.1 million, $305.7 million and $317.9 million, respectively. The Health Plan was established under the terms of collective bargaining agreements between the Union, the Realty Advisory Board on Labor Relations, Inc. and certain other employers. The Health Plan provides health and other benefits to eligible participants employed in the building service industry who are covered under collective bargaining agreements, or other written agreements, with the Union. The Health Plan is administered by a Board of Trustees with equal representation by the employers and the Union and operates under employer identification number 13-2928869. The Health Plan receives contributions in accordance with collective bargaining agreements or participation agreements. Generally, these agreements provide that the employers contribute to the Health Plan at a fixed rate on behalf of each covered employee. For the plan years ended June 30, 2021, 2022 and 2023, the Health Plan received contributions from employers totaling $1.5 billion, $1.6 billion and $1.9 billion, respectively. Term of Collective Bargaining Agreements Our collective bargaining agreement for Service Employees International Union Local 32BJ relating to commercial properties in New York City was renewed and commenced effective January 1, 2024 through December 31, 2027. We are in the process of negotiating a successor agreement to the collective bargaining agreement for Service Employees International Union Local 32BJ relating to our operations in the greater New York metropolitan area. We are also a signatory to another collective bargaining agreement for Service Employees International Union Local 32BJ with a term from April 21, 2022 through April 20, 2026 for our residential properties. Contributions Contributions we made to the multi-employer plans for the years ended December 31, 2023 , 2022 and 2021 are included in the table below (amounts in thousands): For the Year Ended December 31, Benefit Plan 2023 2022 2021 Pension Plans (pension and annuity)* $ 3,671 $ 2,958 $ 2,165 Health Plans** 8,812 8,618 6,214 Other*** 434 460 305 Total plan contributions $ 12,917 $ 12,036 $ 8,684 * Pension plans include $0.8 million, $0.8 million and $0.7 million for the years ended 2023, 2022 and 2021, respectively, to multiemployer plans not discussed above. ** Health plans include $1.6 million, $1.5 million and $1.4 million for the years ended 2023, 2022 and 2021, respectively, to multiemployer plans not discussed above. *** Other consists of union costs which were not itemized between pension and health plans. Other includes $0.3 million, $0.2 million and $0.2 million for the years ended 2023, 2022 and 2021, respectively, in connection with other multiemployer plans not discussed above.

Capital

Capital	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Capital	Capital Shares and Units As of December 31, 2023, there were 162,061,947 shares of Class A common stock, 984,317 shares of Class B common stock and 107,900,200 operating partnership units outstanding. The controlling interest of 60.2% is owned by ESRT. The other 39.8% noncontrolling interest in the OP is diversified among various limited partners, some of whom include Company directors, senior management and employees. ESRT has two classes of common stock as a means to give its OP Unit holders voting rights in the public company that correspond to their economic interest in the combined entity. A one-time option was created at our formation transactions for any pre-IPO OP Unit holder to exchange one OP Unit out of every 50 OP Units they owned for one Class B share, and such Class B share carries 50 votes per share. Stock and Publicly Traded Operating Partnership Unit Repurchase Program ESRT's Board of Directors authorized the repurchase of up to $500 million of ESRT Class A common stock and the Operating Partnership’s Series ES, Series 250 and Series 60 operating partnership units from January 1, 2022 through December 31, 2023. Upon expiration of this program, ESRT's Board of Directors authorized the repurchase of up to $500 million of ESRT's Class A common stock and our Series ES, Series 250 and Series 60 operating partnership units during the period from January 1, 2024 through December 31, 2025. Under the program, ESRT may purchase ESRT Class A common stock and we may purchase our Series ES, Series 250 and Series 60 operating partnership units in accordance with applicable securities laws from time to time in the open market or in privately negotiated transactions. The timing, manner, price and amount of any repurchases will be determined by ESRT and us at our discretion and will be subject to stock price, availability, trading volume, general market conditions, and applicable securities laws. The authorization does not obligate ESRT or us to acquire any particular amount of securities, and the program may be suspended or discontinued at ESRT's and our discretion without prior notice. At December 31, 2023, we had used approximately $103.3 million of the authorized repurchase amount for the 2022-2023 period. The following table summarizes our purchases of equity securities for the year ended December 31, 2023 under the previous repurchase program. Period Total Number of Shares Purchased Average Price Paid Per Share Total Number of Shares Purchased as Part of Publicly Announced Plan Maximum Approximate Dollar Value Available for Future Purchases Year ended December 31, 2023 2,150,857 $ 6.09 2,150,857 $500,000,000 (a) (a) Represents the new board authorization for the January 1, 2024 - December 31, 2025 period. As of the date of this filing, we have used $0 of such $500 million authorization. Private Perpetual Preferred Units As of December 31, 2023, there were 4,664,038 Series 2019 Preferred Units ("Series 2019 Preferred Units") and 1,560,360 Series 2014 Private Perpetual Preferred Units ("Series 2014 Preferred Units"). The Series 2019 Preferred Units have a liquidation preference of $13.52 per unit and are entitled to receive cumulative preferential annual cash distributions of $0.70 per unit payable in arrears on a quarterly basis. The Series 2014 Preferred Units which have a liquidation preference of $16.62 per unit and are entitled to receive cumulative preferential annual cash distributions of $0.60 per unit payable in arrears on a quarterly basis. Both series are not redeemable at the option of the holders and are redeemable at our option only in the case of specific defined events. Distributions The following table summarizes the distributions paid on our operating partnership units for the years ended December 31, 2023, 2022 and 2021: Record Date Payment Date Amount per Operating Partnership Unit December 18, 2023 December 29, 2023 $0.035 September 15, 2023 September 29, 2023 $0.035 June 15, 2023 June 30, 2023 $0.035 March 15, 2023 March 31, 2023 $0.035 December 19, 2022 December 31, 2022 $0.035 September 15, 2022 September 30, 2022 $0.035 June 15, 2022 June 30, 2022 $0.035 March 15, 2022 March 31, 2022 $0.035 December 20, 2021 December 31, 2021 $0.035 September 15, 2021 September 30, 2021 $0.035 June 15, 2021 June 30, 2021 $0.035 Total distributions paid to OP unitholders and Preferred unitholders during 2023, 2022 and 2021 totaled $41.3 million, $42.8 million and $32.8 million, respectively. Incentive and Share-Based Compensation On May 16, 2019, the Empire State Realty Trust, Inc. Empire State Realty OP, L.P. 2019 Equity Incentive Plan (“2019 Plan”) was approved by our shareholders. The 2019 Plan provides for grants to directors, employees and consultants of our Company and Operating Partnership, including options, restricted stock, restricted stock units, stock appreciation rights, performance awards, dividend equivalents and other equity-based awards, and replaced the First Amended and Restated Empire State Realty Trust, Inc. and Empire State Realty OP, L.P. 2013 Equity Incentive Plan ("2013 Plan", and collectively with the 2019 Plan, "the Plans"). The shares of Class A common stock underlying any awards under the 2019 Plan and the 2013 Plan that are forfeited, canceled or otherwise terminated, other than by exercise, will be added back to the shares of Class A common stock available for issuance under the 2019 Plan. Shares tendered or held back upon exercise of a stock option or settlement of an award under the 2019 Plan or the 2013 Plan to cover the exercise price or tax withholding and shares subject to a stock appreciation right that are not issued in connection with the stock settlement of the stock appreciation right upon exercise thereof, will not be added back to the shares of Class A common stock available for issuance under the 2019 Plan. In addition, shares of Class A common stock repurchased on the open market will not be added back to the shares of Class A common stock available for issuance under the 2019 Plan. An aggregate of approximately 11.0 million shares of our common stock was authorized for issuance under awards granted pursuant to the 2019 Plan, and as of December 31, 2023, approximately 4.2 million shares of common stock remain available for future issuance under the Plans. Long-term incentive plan ("LTIP") units are a special class of partnership interests in the Operating Partnership. Each LTIP unit awarded will be deemed equivalent to an award of one share of stock under the Plans, reducing the availability for other equity awards on a one-for-one basis. The vesting period for LTIP units, if any, will be determined at the time of issuance. Under the terms of the LTIP units, the Operating Partnership will revalue for tax purposes its assets upon the occurrence of certain specified events, and any increase in valuation from the time of one such event to the next such event will be allocated first to the holders of LTIP units to equalize the capital accounts of such holders with the capital accounts of OP unitholders. Subject to any agreed upon exceptions, once vested and having achieved parity with OP unitholders, LTIP units are convertible into OP Units in the Operating Partnership on a one-for-one basis. LTIP units subject to time-based vesting, whether vested or not, receive the same per unit distributions as OP Units, which equal per share dividends (both regular and special) on our common stock. Market and performance-based LTIPs receive 10% of such distributions currently, unless and until such LTIP units are earned based on performance, at which time they will receive the accrued and unpaid 90% and will commence receiving 100% of such distributions thereafter. In March 2023, we made grants of LTIP units to executive officers under the 2019 Plan, including a total of 552,412 LTIP units that are subject to time-based vesting, 834,456 LTIP units that are subject to market-based vesting and 679,969 units that are subject to performance-based vesting with fair market values of $3.2 million, $3.9 million and $3.9 million, respectively. In March 2023, we made grants of LTIP units and restricted stock to certain other employees under the 2019 Plan, including a total of 229,308 LTIP units and 370,465 shares of restricted stock that are subject to time-based vesting, 111,942 LTIP units that are subject to market-based vesting and 91,211 LTIP units that are subject to performance-based vesting, with fair market values of $1.5 million and $2.6 million, respectively, for the time-based vesting awards, $0.6 million for the market-based vesting awards and $0.6 million for the performance-based vesting awards. The awards subject to time-based vesting vest ratably over four years, subject generally to the grantee's continued employment, with the first installment vesting on January 1, 2024. The vesting of the LTIP units subject to market-based vesting is based on the achievement of relative total stockholder return hurdles over a three -year performance period, commencing on January 1, 2023. The vesting of the LTIP units subject to performance-based vesting is based on the achievement of (i) operational metrics over a one -year performance period, subject to a three -year absolute TSR modifier, and (ii) environmental, social and governance metrics over a three -year performance period, in each case, commencing on January 1, 2023. Following the completion of the respective performance periods, our Compensation and Human Capital Committee will determine the number of LTIP units to which the grantee is entitled based on our performance relative to the performance hurdles set forth in the LTIP unit award agreements the grantee entered in connection with the award grant. These LTIP units then vest in two equal installments, on January 1, 2025 and December 31, 2026, subject generally to the grantee's continued employment on those dates. In March 2023, we also made one-time additional grants of LTIP units to certain non-executive employees under the 2019 Plan. At such time, we granted to certain other employees a total of 152,542 LTIP units that are subject to time-based vesting, with a fair market value of $1.0 million that vest over four five In 2023, our named executive officers could elect to receive their annual incentive bonus in any combination of (i) cash or vested LTIPs at the face amount of such bonus or (ii) time-vesting LTIPs which would vest over three years, subject to continued employment, at a premium over such face amount (120% for awards granted in 2021, 2022, and 2023; 125% for years prior to 2021). In March 2023, we made grants of LTIP units to executive officers under the 2019 Plan in connection with the 2022 bonus election program. We granted to executive officers a total of 521,571 LTIP units that are subject to time-based vesting with a fair market value of $3.0 million. Of these LTIP units, 446,376 LTIP units vest ratably over three years from January 1, 2023, subject generally to the grantee's continued employment. The first installment vests on January 1, 2024, and the remainder will vest thereafter in two equal annual installments on January 1, 2025 and January 1, 2026. We also granted to our retired general counsel 75,195 LTIP units that vested immediately on the grant date. Annually, we make grants of LTIP units to our non-employee directors under the 2019 Plan. In May 2023, each of our directors received 60% of their $200,000 annual base retainer in the form of equity vesting ratably over four years, and could elect to receive the remaining 40% of such base retainer in (i) cash at the face value of the award, (ii) immediately vesting equity at the face value of the award, or (iii) equity vesting ratably over three years at 120% of the face amount. Each director could elect to receive any equity portion of the base retainer in either (i) LTIP units or (ii) restricted shares of our Class A common stock. In accordance with each director's election, in May 2023, we granted a total of 237,856 LTIP units that are subject to time-based vesting with fair market values of $1.2 million. The LTIP units vest ratably over three four During July 2023, we granted our two new directors, Christina Van Tassell and Hannah Yang, a total of 27,000 LTIP units which are subject to time-based vesting with a combined fair market value of $0.2 million. One-fourth of the units will vest on May 12, 2024, and the remainder shall vest in substantially equal installments on each subsequent anniversary for a period of three Share-based compensation for time-based equity awards is measured at the fair value of the award on the date of grant and recognized as an expense on a straight-line basis over the shorter of (i) the stated vesting period, which is generally three four three For the market-based LTIP units, the fair value of the awards was estimated using a Monte Carlo Simulation model and discounted for the restriction period during which the LTIP units cannot be redeemed or transferred and the uncertainty regarding if, and when, the book capital account of the LTIP units will equal that of the common units. Our stock price, along with the prices of the comparative indexes, is assumed to follow the Geometric Brownian Motion Process. Geometric Brownian Motion is a common assumption when modeling in financial markets, as it allows the modeled quantity (in this case the stock price) to vary randomly from its current value and take any value greater than zero. The volatilities of the returns on our stock price and the comparative indexes were estimated based on implied volatilities and historical volatilities using an appropriate look-back period. The expected growth rate of the stock prices over the performance period is determined with consideration of the risk-free rate as of the grant date. For LTIP unit awards that are time or performance based, the fair value of the awards was estimated based on the fair value of our stock at the grant date discounted for the restriction period during which the LTIP units cannot be redeemed or transferred and the uncertainty regarding if, and when, the book capital account of the LTIP units will equal that of the common units. For restricted stock awards, the fair value of the awards are based on the market price of ESRT stock at the grant date. LTIP units and ESRT restricted stock issued during the year ended December 31, 2023, 2022 and 2021 were valued at $21.7 million, $22.4 million and $20.0 million, respectively. The weighted-average per unit or share fair value was $5.67, $7.21 and $8.52 for grants issued in 2023, 2022 and 2021, respectively. The fair value per unit or share granted in 2023 was estimated on the respective dates of grant using the following assumptions: an expected life from 2.0 to 5.3 years, a dividend rate of 1.7%, a risk-free interest rate from 4.4% to 5.0%, and an expected price volatility from 35.0% to 46.0%. The fair value per unit or share granted in 2022 was estimated on the respective dates of grant using the following assumptions: an expected life from 2.0 to 5.3 years, a dividend rate of 2.0%, a risk-free interest rate from 1.4% to 2.0%, and an expected price volatility from 37.0% to 53.0%. The fair value per unit or share granted in 2021 was estimated on the respective dates of grant using the following assumptions: an expected life from 2.0 to 5.3 years, a dividend rate of 2.60%, a risk-free interest rate from 0.12% to 0.32%, and an expected price volatility from 36.0% to 53.0%. No other stock options, dividend equivalents, or stock appreciation rights were issued or outstanding in 2023, 2022 and 2021. The following is a summary of ESRT restricted stock and LTIP unit activity for the year ended December 31, 2023: ESRT Restricted Stock Time-based LTIPs Market-based LTIPs Performance-based LTIPs Weighted Average Grant Fair Value Unvested balance at December 31, 2022 359,293 2,713,522 4,070,537 510,989 $ 6.69 Vested (121,128) (1,148,987) (582,800) (2,011) 7.17 Granted 370,465 1,733,015 946,398 771,180 5.67 Forfeited or unearned (10,341) — (1,695,323) (3,795) 4.30 Unvested balance at December 31, 2023 598,289 3,297,550 2,738,812 1,276,363 $ 6.60 The total fair value of LTIP units and restricted stock that vested during 2023, 2022 and 2021 was $13.3 million, $14.1 million and $12.3 million, respectively. The time-based LTIPs and restricted stock awards are treated for accounting purposes as immediately vested upon the later of (i) the date the grantee attains the age of 60 or 65, as applicable, and (ii) the date on which grantee has first completed the requisite years of continuous service with our Company or its affiliates. For award agreements that qualify, we recognize noncash compensation expense on the grant date for the time-based awards and ratably over the vesting period for the market-based and performance-based awards, and accordingly, we recognized $2.8 million, $2.3 million and $1.3 million for the years ended December 31, 2023, 2022 and 2021, respectively. Unrecognized compensation expense was $3.2 million at December 31, 2023, which will be recognized over a weighted average period of 2.4 years. For the remainder of the LTIP unit awards, we recognized noncash compensation expense ratably over the vesting period, and accordingly, we recognized $17.2 million, $18.7 million and $19.0 million in noncash compensation expense for the years ended December 31, 2023, 2022 and 2021, respectively. Unrecognized compensation expense was $24.1 million at December 31, 2023, which will be recognized over a weighted average period of 2.4 years. Earnings Per Unit Earnings per unit is calculated by dividing the net income attributable to common unitholders by the weighted average number of units outstanding during the respective period. Unvested share-based payment awards that contain non-forfeitable rights to dividends, whether paid or unpaid, are accounted for as participating securities. Share-based payment awards are included in the calculation of diluted income using the treasury stock method if dilutive. Earnings per unit for the years ended December 31, 2023, 2022 and 2021 is computed as follows (amounts in thousands, except per share amounts): For the Year Ended December 31, 2023 2022 2021 Numerator: Net income (loss) $ 84,407 $ 63,212 $ (13,037) Private perpetual preferred unit distributions (4,201) (4,201) (4,201) Net (income) loss attributable to non-controlling interests in other partnerships (68) 243 — Earnings allocated to unvested shares — — (340) Net income (loss) attributable to common unitholders - basic and diluted $ 80,138 $ 59,254 $ (17,578) Denominator: Weighted average units outstanding - basic 263,226 268,337 277,420 Effect of dilutive securities: Stock-based compensation plans 2,407 1,611 — Weighted average shares outstanding - diluted 265,633 269,948 277,420 Earnings per unit - basic and diluted $ 0.30 $ 0.22 $ (0.06) There were zero antidilutive shares for the years ended December 31, 2023 and 2022, respectively. There were 1,052,390 antidilutive shares for the year ended December 31, 2021.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2023
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Sale of Westport Retail Properties On February 1, 2023, we closed on the disposition of our retail assets located at 69-97 and 103-107 Main Street in Westport, Connecticut, for total consideration of $40.0 million, to an entity affiliated with our Chairman and Chief Executive Officer, Anthony E. Malkin (the “Westport Transaction”). The Company determined to make the sale to the related party entity after a marketed sale process conducted from February 2022 through August 2022 through a broker in which it received several third-party bids. Deals with third-party purchasers failed to materialize due to adverse changes in capital market conditions during that time. The Westport Transaction materialized due to timing because the related party entity had recently completed a sale of property and was in the market for exchange property to defer tax in a 1031 exchange, and the Company recently executed on the acquisition of 298 Mulberry Street. The $40.0 million valuation for the Westport Transaction is in the range of the bids the Company received during the marketed sale process. In connection with the Westport Transaction, we advanced a loan to the buyer to facilitate closing with a maximum principal amount of up to $1.0 million, which bore interest at SOFR plus 3.5% and required repayment of principal to the extent of available cash flow of the property. As of December 31, 2023, the loan has been fully paid. The Company has a written Related Party Transactions Policy (the “Policy”) which requires the Nominating and Corporate Governance Committee to review the material facts of all related party transactions and consider all relevant factors in approving any related party transaction. Further, the Policy provides that a director or executive officer shall not participate in any consideration, discussion or approval of such related party transaction in which he or she is a related party. The Westport Transaction process was completed in compliance with the Policy. The independent members of the Nominating and Corporate Governance Committee conducted an independent review under the guidance of outside counsel and then approved the transaction. The Company reviewed with outside counsel best practices for the specific Westport Transaction and took additional precautions to ensure an arms-length process. There were separate counsels and appraisals for both buyer and seller. Tax Protection Agreements In 2013, we and ESRT entered into a tax protection agreement with Anthony E. Malkin and Peter L. Malkin that is intended to protect to a limited extent the Malkin Group and an additional third-party investor in Metro Center (who was one of the original landowners and was involved in the development of the property) against certain tax consequences arising from a transaction involving one of four properties, which we refer to in this section as the protected assets. First, this agreement provides that we will not sell, exchange, transfer or otherwise dispose of such protected assets, or any interest in a protected asset, until (i) October 7, 2025, with respect to one protected asset, First Stamford Place, and (ii) the later of (x) October 7, 2021 and (y) the death of both Peter L. Malkin and Isabel W. Malkin, who are 90 and 87 years old, respectively, for the three other protected assets, Metro Center, 298 Mulberry Street (“substituted basis property” as contemplated by the tax protection agreement for 10 Bank Street, which was sold on December 7, 2022) and 1542 Third Avenue, unless: (1) Anthony E. Malkin consents to the sale, exchange, transfer or other disposition; or (2) we deliver to each protected party thereunder a cash payment intended to approximate the tax liability arising from the recognition of the pre-contribution built-in gain resulting from the sale, exchange, transfer or other disposition of such protected asset (with the pre-contribution “built-in gain” being not more than the taxable gain that would have been recognized by such protected party if the protected asset been sold for fair market value in a taxable transaction at the time of the consolidation) plus an additional amount so that, after the payment of all taxes on amounts received pursuant to the agreement (including any tax liability incurred as a result of receiving such payment), the protected party retains an amount equal to such protected party’s total tax liability incurred as a result of the recognition of the pre-contribution built-in gain pursuant to such sale, exchange, transfer or other disposition; or (3) the disposition does not result in a recognition of any built-in gain by the protected party. Second, with respect to the Malkin Group, including Anthony E. Malkin and Peter L. Malkin, and one additional third-party investor in Metro Center (who was one of the original landowners and was involved in the development of the property), to protect against gain recognition resulting from a reduction in such continuing investor’s share of our liabilities, the agreement provides that during the period from October 7, 2013 until such continuing investor owns less than the aggregate number of operating partnership units and shares of ESRT common stock equal to 50% of the aggregate number of such units and shares such investor received in the formation transactions, which we refer to in this section as the tax protection period, we will (i) refrain from prepaying any amounts outstanding under any indebtedness secured by the protected assets and (ii) use our commercially reasonable efforts to refinance such indebtedness at or prior to maturity at its current principal amount, or, if we are unable to refinance such indebtedness at its current principal amount, at the highest principal amount possible. The agreement also provides that, during the tax protection period, we will make available to such continuing investors the opportunity (i) to enter into a “bottom dollar” guarantee of their allocable share of $160.0 million of our aggregate indebtedness meeting certain requirements or (ii) in the event we have recourse debt outstanding and such a continuing investor agrees, in lieu of guaranteeing debt pursuant to clause (i) above, to enter into a deficit restoration obligation, in each case, in a manner intended to provide an allocation of our liabilities to the continuing investor. In the event that a continuing investor guarantees our debt, such continuing investor will be responsible, under certain circumstances, for the repayment of the guaranteed amount to the lender in the event that the lender would otherwise recognize a loss on the loan, such as, for example, if property securing the loan was foreclosed and the value was not sufficient to repay a certain amount of the debt. A deficit restoration obligation is a continuing investor’s obligation, under certain circumstances, to contribute a designated amount of capital to us upon our liquidation in the event that our assets are insufficient to repay our liabilities. Because we expect that we will at all times have sufficient liabilities to allow us to meet our obligations to allocate liabilities to our partners that are protected parties under the tax protection agreement, our indemnification obligation with respect to “certain tax liabilities” would generally arise only in the event that we dispose in a taxable transaction of a protected asset within the period specified above in a taxable transaction. In the event of such a disposition, the amount of our indemnification obligation would depend on several factors, including the amount of “built-in gain,” if any, recognized and allocated to the indemnified partners with respect to such disposition and the effective tax rate to be applied to such gain at the time of such disposition. Our disposition of the 10 Bank Street asset on December 7, 2022 did not trigger any obligation of payment pursuant to the tax protection agreement. Our partnership agreement requires that allocations with respect to such acquired property be made in a manner consistent with Section 704(c) of the Code. Treasury Regulations issued under Section 704(c) of the Code provide partnerships with a choice of several methods of allocating book-tax differences. Under the tax protection agreement, we have agreed to use the “traditional method” for accounting for book-tax differences for the properties acquired by us in the consolidation. Under the traditional method, which is the least favorable method from our perspective, the carryover basis of the acquired properties in our hands (i) may cause us to be allocated lower amounts of depreciation and other deductions for tax purposes than would be allocated to us if all of the acquired properties were to have a tax basis equal to their fair market value at the time of acquisition and (ii) in the event of a sale of such properties, could cause us to be allocated gain in excess of its corresponding economic or book gain (or taxable loss that is less than its economic or book loss), with a corresponding benefit to the partners transferring such properties to us for interests in us. In 2016, we entered into a tax protection agreement with Q REIT Holding LLC, a Qatar Financial Centre limited liability company and a wholly owned subsidiary of the Qatar Investment Authority, a governmental authority of the State of Qatar ("QREIT", and together with any eligible transferee, "QIA"). Subject to certain minimum thresholds and conditions, ESRT will indemnify QIA for certain applicable U.S. federal and state taxes payable by QIA in connection with dividends paid by ESRT on the QIA shares that are attributable to capital gains from the sale or exchange of any U.S. real property interests. ESRT's obligation to indemnify QIA will terminate one year following the date on which the sum of the QIA shares then owned by QIA falls below 10% of ESRT outstanding common shares. Registration Rights We entered into a registration rights agreement with certain persons receiving shares of ESRT common stock or operating partnership units in the formation transactions, including certain members of ESRT's senior management team and our other continuing investors. In connection therewith, we have filed, and are obligated to maintain the effectiveness of, an automatically effective shelf registration statement, along with a prospectus supplement, with respect to, among other things, shares of ESRT Class A common stock that may be issued upon redemption of operating partnership units or issued upon conversion of shares of ESRT Class B common stock to continuing investors in the public existing entities. Pursuant to the registration rights agreement, under certain circumstances, ESRT will also be required to undertake an underwritten offering upon the written request of the Malkin Group, which we refer to as the holder, provided (i) the registrable shares to be registered in such offering will have a market value of at least $150.0 million, (ii) ESRT will not be obligated to effect more than two underwritten offerings during any 12-month period; and (iii) the holder will not have the ability to effect more than four underwritten offerings. In addition, if ESRT files a registration statement with respect to an underwritten offering for its own account or on behalf of the holder, the holder will have the right, subject to certain limitations, to register such number of registrable shares held by him, her or it as each such holder requests. With respect to underwritten offerings on behalf of the holder, ESRT will have the right to register such number of primary shares as it requests; provided, however, that if cut backs are required by the managing underwriters of such an offering, ESRT's primary shares shall be cutback first (but in no event will our shares be cut back to less than $25.0 million). ESRT has also agreed to indemnify the persons receiving rights against specified liabilities, including certain potential liabilities arising under the Securities Act, or to contribute to the payments such persons may be required to make in respect thereof. ESRT has agreed to pay all of the expenses relating to the registration and any underwritten offerings of such securities, including, without limitation, all registration, listing, filing and stock exchange or FINRA fees, all fees and expenses of complying with securities or “blue sky” laws, all printing expenses and all fees and disbursements of counsel and independent public accountants retained by ESRT, but excluding underwriting discounts and commissions, any out-of-pocket expenses (except ESRT will pay any holder’s out-of-pocket fees (including disbursements of such holder’s counsel, accountants and other advisors) up to $25,000 in the aggregate for each underwritten offering and each filing of a resale shelf registration statement or demand registration statement), and any transfer taxes. Employment Agreement and Change in Control Severance Agreements ESRT entered into an employment agreement with Anthony E. Malkin, which provides for salary, bonuses and other benefits, including among other things, severance benefits upon a termination of employment under certain circumstances and the issuance of equity awards. In addition, ESRT entered into change in control severance agreements with Thomas P. Durels and Christina Chiu. Indemnification of Our Directors and Officers We entered into indemnification agreements with each of ESRT's directors, executive officers, chairman emeritus and certain other parties, providing for the indemnification by us for certain liabilities and expenses incurred as a result of actions brought, or threatened to be brought, against (i) ESRT's directors, executive officers and chairman emeritus and (ii) ESRT's executive officers, chairman emeritus and certain other parties who are former members, managers, securityholders, directors, limited partners, general partners, officers or controlling persons of our predecessor in such capacities. Excluded Properties and Businesses The Malkin Group, including Anthony E. Malkin, our Chairman and Chief Executive Officer, owns non-controlling interests in, and Anthony E. Malkin and Peter L. Malkin control the general partners or managers of, the entities that own interests in seven multi-family properties and five net leased retail properties, (including one single tenant retail property in Greenwich, Connecticut). The Malkin Group also owns non-controlling interests in one Manhattan office property, two Manhattan retail properties and several retail properties outside of Manhattan, none of which were contributed to us in the formation transactions, and two retail properties in Westport, Connecticut acquired from ESRT in February 2023 (see Sale of Westport Retail Properties above). We refer to the non-controlling interests described above collectively as the excluded properties. In addition, the Malkin Group owns interests in one senior equity fund and three property managers, which we refer to collectively as the excluded businesses. We do not believe that the excluded properties or the excluded businesses are consistent with our current commercial portfolio or strategic direction. Pursuant to management and/or service agreements with the owners of interests in those excluded properties and businesses, we are designated as the asset manager (supervisor) and/or property manager of the excluded properties, provide services to certain of the excluded properties and the other excluded businesses. As the manager or service provider, we are paid a management or other fee with respect to those excluded properties and businesses where our predecessor had previously received a management fee, and reimbursed for our costs in providing the management and other services to those excluded properties and businesses where our predecessor had not previously received a management fee. Our management of the excluded properties and provision of services to the three residential property managers and the existing managers of the other excluded businesses represent a minimal portion of our overall business. There is no established time period in which we will continue to provide such services; and Peter L. Malkin and Anthony E. Malkin expect to sell certain properties or unwind these businesses over time. We are not precluded from acquiring all or certain interests in the excluded properties or businesses. If we were to attempt any such acquisition, we anticipate that Anthony E. Malkin, our Chairman and Chief Executive Officer, will not participate in the negotiation process on our behalf with respect to our potential acquisition of any of these excluded properties or businesses, and the approval of a majority of our independent directors will be required to approve any such acquisition. Services are and were provided by us to excluded properties and businesses. These transactions are reflected in our consolidated statements of operations as third-party management and other fees. We earned asset management (supervisory) and service fees from excluded properties and businesses of $0.9 million, $1.0 million and $1.0 million during the years ended December 31, 2023, 2022 and 2021, respectively. We earned property management fees from excluded properties of $0.3 million, $0.3 million and $0.2 million during the years ended December 31, 2023, 2022 and 2021, respectively. Other

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Holdings TRS and Observatory TRS are taxable entities and their consolidated provision for income taxes consisted of the following for the years ended December 31, 2023, 2022 and 2021 (amounts in thousands): For the Year Ended December 31, 2023 2022 2021 Current: Federal $ (783) $ (319) $ (266) State and local (695) (227) (347) Total current (1,478) (546) (613) Deferred: Federal (710) (264) 1,206 State and local (527) (736) 1,141 Total deferred (1,237) (1,000) 2,347 Income tax (expense) benefit $ (2,715) $ (1,546) $ 1,734 As of December 31, 2023, Empire State Realty Trust, Inc. had $103.0 million of NOL carryforwards that may be used in the future to reduce the amount otherwise required to be distributed by ESRT to meet REIT requirements. However, for federal income tax purposes, the NOL will not be able to offset more than 80% of ESRT’s REIT taxable income and may not be able to reduce the amount required to be distributed by ESRT to meet REIT requirements to zero. The federal NOL may be carried forward indefinitely. Other limitations may apply to ESRT’s ability to use its NOL to offset taxable income. As of December 31, 2023, the Observatory TRS had a federal income tax receivable of $2.5 million. This receivable reflects an anticipated refund resulting from the carryback of 2020 NOL to previous tax years. The Observatory TRS has $1.5 million of federal NOL carryforward that may be used to offset future taxable income, if any. The federal NOL may be carried forward indefinitely. We measure deferred tax assets using enacted tax rates that will apply in the years in which the temporary differences are expected to be recovered or paid. The effective income tax rate is 44.5%, 33.6% and 26.0% for the years ended December 31, 2023, 2022 and 2021, respectively. The actual tax provision differed from that computed at the federal statutory corporate rate as follows (amounts in thousands): For the Year Ended December 31, 2023 2022 2021 Federal tax benefit (expense) at statutory rate $ (1,494) $ (583) $ 940 State income tax benefit (expense), net of federal benefit (1,221) (963) 794 Income tax (expense) benefit $ (2,715) $ (1,546) $ 1,734 The income tax effects of temporary differences that give rise to deferred tax assets are presented below as of December 31, 2023, 2022 and 2021 (amounts in thousands): 2023 2022 2021 Deferred tax assets: Deferred revenue on unredeemed Observatory admission ticket sales $ 616 $ 535 $ 383 Federal net operating loss carryforward credit 328 969 1,393 New York State net operating loss carryforward credit — 250 612 New York City net operating loss carryforward credit — 233 704 Other deferred tax assets 161 261 — Deferred tax assets $ 1,105 $ 2,248 $ 3,092 Deferred tax assets at December 31, 2023, 2022 and 2021 are included in prepaid expenses and other assets on the consolidated balance sheets. The deferred tax assets at December 31, 2023 are mainly attributable to a timing difference in recognizing income on unredeemed Observatory admission tickets and the inclusion of the Federal net operating loss to be carried forward and utilized during income years indefinitely. No valuation allowance has been recorded against the deferred tax asset because the Company believes it is more likely than not that the deferred tax asset will be realized. This determination is based on the Observatory TRS’s anticipated future taxable income and the reversal of the deferred tax asset.

Segment Reporting

Segment Reporting	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting We have identified two reportable segments: (1) real estate and (2) Observatory. Our real estate segment includes all activities related to the ownership, management, operation, acquisition, redevelopment, repositioning and disposition of our traditional real estate assets. Our Observatory segment operates the 86th and 102nd floor observatories at the Empire State Building. These two lines of businesses are managed separately because each business requires different support infrastructures, provides different services and has dissimilar economic characteristics such as investments needed, stream of revenues and marketing strategies. We account for intersegment sales and rents as if the sales or rents were to third parties, that is, at current market prices. The following tables provide components of segment profit for each segment for the years ended December 31, 2023, 2022 and 2021 (amounts in thousands): 2023 Real Estate Observatory Intersegment Elimination Total Revenues: Rental revenue $ 597,319 $ — $ — $ 597,319 Intercompany rental revenue 80,514 — (80,514) — Observatory revenue — 129,366 — 129,366 Lease termination fees — — — — Third-party management and other fees 1,351 — — 1,351 Other revenue and fees 11,536 — — 11,536 Total revenues 690,720 129,366 (80,514) 739,572 Operating expenses: Property operating expenses 167,324 — — 167,324 Intercompany rent expense — 80,514 (80,514) — Ground rent expenses 9,326 — — 9,326 General and administrative expenses 63,939 — — 63,939 Observatory expenses — 35,265 — 35,265 Real estate taxes 127,101 — — 127,101 Depreciation and amortization 189,762 149 — 189,911 Total operating expenses 557,452 115,928 (80,514) 592,866 Total operating income 133,268 13,438 — 146,706 Other income (expense): Interest income 14,936 200 — 15,136 Interest expense (101,484) — — (101,484) Gain on sale/disposition of properties 26,764 — — 26,764 Income before income taxes 73,484 13,638 — 87,122 Income tax expense (552) (2,163) — (2,715) Net income $ 72,932 $ 11,475 $ — $ 84,407 Segment assets $ 3,957,659 $ 261,674 $ — $ 4,219,333 Expenditures for segment assets $ 169,044 $ 111 $ — $ 169,155 2022 Real Estate Observatory Intersegment Elimination Total Revenues: Rental revenue $ 591,048 $ — $ — $ 591,048 Intercompany rental revenue 65,005 — (65,005) — Observatory revenue — 105,978 — 105,978 Lease termination fees 20,032 — — 20,032 Third-party management and other fees 1,361 — — 1,361 Other revenue and fees 8,622 — — 8,622 Total revenues 686,068 105,978 (65,005) 727,041 Operating expenses: Property operating expenses 157,935 — — 157,935 Intercompany rent expense — 65,005 (65,005) — Ground rent expenses 9,326 — — 9,326 General and administrative expenses 61,765 — — 61,765 Observatory expenses — 31,036 — 31,036 Real estate taxes 123,057 — — 123,057 Impairment charge — — — — Depreciation and amortization 216,707 187 — 216,894 Total operating expenses 568,790 96,228 (65,005) 600,013 Total operating income (loss) 117,278 9,750 — 127,028 Other income (expense): Interest income 4,901 47 — 4,948 Interest expense (101,206) — — (101,206) Gain on sale/disposition of properties 33,988 — — 33,988 Income before income taxes 54,961 9,797 — 64,758 Income tax (expense) benefit (584) (962) — (1,546) Net income $ 54,377 $ 8,835 $ — $ 63,212 Segment assets $ 3,909,299 $ 254,295 $ — $ 4,163,594 Expenditures for segment assets $ 85,646 $ 315 $ — $ 85,961 2021 Real Estate Observatory Intersegment Elimination Total Revenues: Rental revenue $ 559,690 $ — $ — $ 559,690 Intercompany rental revenue 23,413 — (23,413) — Observatory revenue — 41,474 — 41,474 Lease termination fees 16,230 — — 16,230 Third-party management and other fees 1,219 — — 1,219 Other revenue and fees 5,343 138 — 5,481 Total revenues 605,895 41,612 (23,413) 624,094 Operating expenses: Property operating expenses 126,986 — — 126,986 Intercompany rent expense — 23,413 (23,413) — Ground rent expenses 9,326 — — 9,326 General and administrative expenses 55,947 — — 55,947 Observatory expenses — 23,206 — 23,206 Real estate taxes 119,967 — — 119,967 Impairment charges 7,723 — — 7,723 Depreciation and amortization 201,676 130 — 201,806 Total operating expenses 521,625 46,749 (23,413) 544,961 Total operating income (loss) 84,270 (5,137) — 79,133 Other income (expense): Interest income 701 3 — 704 Interest expense (94,292) (102) — (94,394) Loss on early extinguishment of debt (214) — — (214) Loss before income taxes (9,535) (5,236) — (14,771) Income tax (expense) benefit (613) 2,347 — 1,734 Net loss $ (10,148) $ (2,889) $ — $ (13,037) Segment assets $ 4,037,122 $ 245,325 $ — $ 4,282,447 Expenditures for segment assets $ 398,368 $ 4 $ — $ 398,372

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2023
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events None.

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2023
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III - Real Estate and Accumulated Depreciation	Schedule III—Real Estate and Accumulated Depreciation (amounts in thousands) Initial Cost to Cost Capitalized Gross Amount at which Carried at 12/31/23 Development Type Encumbrances Land and Development Costs Building & Improvements Carrying Land and Development Costs Buildings & Total Accumulated Date of Date Life on 111 West 33rd Street, New York, NY office / $ — $ 13,630 $ 244,461 $ 129,859 n/a $ 13,630 $ 374,320 $ 387,950 $ (118,371) 1954 2014 various 1400 Broadway, New York, NY office / — — 96,338 102,241 n/a — 198,579 198,579 (72,907) 1930 2014 various 1333 Broadway, New York, NY office / 159,039 91,434 120,190 17,239 n/a 91,435 137,429 228,864 (43,811) 1915 2013 various 1350 Broadway, New York, NY office / — — 102,518 48,815 n/a — 151,333 151,333 (55,169) 1929 2013 various 250 West 57th Street, New York, NY office/ 175,755 2,117 5,041 179,876 n/a 2,117 184,917 187,034 (74,936) 1921 1953 various 501 Seventh Avenue, New York, NY office/ — 1,100 2,600 107,812 n/a 1,100 110,412 111,512 (58,775) 1923 1950 various 1359 Broadway, New York, NY office/ — 1,233 1,809 83,221 n/a 1,233 85,029 86,262 (33,438) 1924 1953 various 350 Fifth Avenue (Empire State Building), New York, NY office/ — 21,551 38,934 1,060,121 n/a 21,551 1,099,055 1,120,606 (428,926) 1930 2013 various One Grand Central Place, office/ — 7,240 17,490 310,522 n/a 7,222 328,030 335,252 (164,248) 1930 1954 various First Stamford Place, Stamford, CT office 177,181 22,952 122,738 86,494 n/a 24,860 207,324 232,184 (113,916) 1986 2001 various One Station Place, Stamford, CT (Metro Center) office 80,117 5,313 28,602 40,955 n/a 5,313 69,557 74,870 (41,494) 1987 1984 various 10 Union Square, New York, NY retail 49,762 5,003 12,866 5,742 n/a 5,003 18,608 23,611 (10,102) 1987 1996 various 1542 Third Avenue, New York, NY retail 29,804 2,239 15,266 485 n/a 2,239 15,751 17,990 (9,937) 1991 1999 various 1010 Third Avenue, New York, NY and 77 West 55th Street, New York, NY retail 34,697 4,462 15,819 4,211 n/a 4,462 20,030 24,492 (10,937) 1962 1998 various 345 E 94th Street, New York, NY multi-family 48,646 44,228 55,766 4,237 n/a 44,228 60,003 104,231 (3,485) 2000 2021 various Victory 561 10th Ave, New York, NY multi-family 124,194 91,437 124,997 3,461 n/a 91,437 128,458 219,895 (7,491) 2004 2021 various 298 Mulberry, New York, NY multi-family — 40,935 69,509 1,475 n/a 41,125 70,794 111,919 (1,923) 1986 2022 various Williamsburg Retail, Brooklyn, NY retail — 4,851 20,936 101 n/a 4,860 21,028 25,888 (196) 1910, 1945 2023 various Property for development at the Transportation Hub in Stamford, CT land — 4,541 — 8,179 n/a 12,720 — 12,720 — n/a n/a n/a Totals $ 879,195 $ 364,266 $ 1,095,880 $ 2,195,046 $ — $ 374,535 $ 3,280,657 $ 3,655,192 $ (1,250,062) Empire State Realty OP, L.P. Notes to Schedule III—Real Estate and Accumulated Depreciation (amounts in thousands) 1 . Reconciliation of Investment Properties The changes in our investment properties for the years ended December 31, 2023, 2022 and 2021 are as follows: 2023 2022 2021 Balance, beginning of year $ 3,551,449 $ 3,500,917 $ 3,133,966 Acquisition of new properties 25,787 110,444 316,428 Improvements 106,792 79,070 89,426 Property classified as held for sale — (61,965) — Disposals (28,836) (77,017) (38,903) Balance, end of year $ 3,655,192 $ 3,551,449 $ 3,500,917 The unaudited aggregate cost of investment properties for federal income tax purposes as of December 31, 2023 was $3.8 billion. 2 . Reconciliation of Accumulated Depreciation The changes in our accumulated depreciation for the years ended December 31, 2023, 2022 and 2021 are as follows: 2023 2022 2021 Balance, beginning of year $ 1,137,267 $ 1,072,938 $ 941,612 Depreciation expense 158,879 179,872 162,667 Property classified as held for sale — (30,315) — Disposals (46,084) (85,228) (31,341) Balance, end of year $ 1,250,062 $ 1,137,267 $ 1,072,938 Depreciation of investment properties reflected in the combined statements of income is calculated over the estimated original lives of the assets as follows: Buildings 39 years or useful life Building improvements 39 years or useful life Tenant improvements Term of related lease

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	The accompanying consolidated financial statements prepared in conformity with accounting principles generally accepted in the United States of America ("GAAP") and with the rules and regulations of the SEC, represent our assets and liabilities and operating results. The consolidated financial statements include our accounts and our partially owned and wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
Principles of Consolidation for Variable Interest Entities	We consolidate entities in which we have a controlling financial interest. In determining whether we have a controlling financial interest in a partially owned entity and the requirement to consolidate the accounts of that entity, we consider factors such as ownership interest, board representation, management representation, authority to make decisions, and contractual and substantive participating rights of the partners/members. For variable interest entities ("VIE"), we consolidate the entity if we are deemed to have a variable interest in the entity and through that interest we are deemed the primary beneficiary. The primary beneficiary of a VIE is the entity that has (i) the power to direct the activities that most significantly impact the entity's economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could be significant to the VIE. The primary beneficiary is required to consolidate the VIE. At December 31, 2022, we were the primary beneficiary of a variable interest in the intermediary entity which held title to 298 Mulberry Street, the multifamily asset acquired in December 2022. The intermediary entity was utilized to execute a like-kind exchange and subsequent to March 31, 2023, the like-kind exchange was completed and we took title to 298 Mulberry Street. Therefore, we had no VIEs at December 31, 2023. We will assess the accounting treatment for each investment we may have in the future. This assessment will include a review of each entity’s organizational agreement to determine which party has what rights and whether those rights are protective or participating. For all VIEs, we will review such agreements in order to determine which party has the power to direct the activities that most significantly impact the entity’s economic performance and benefit. In situations where we or our partner could approve, among other things, the annual budget, or leases that cover more than a nominal amount of space relative to the total rentable space at each property, we would not consolidate the investment as we consider these to be substantive participation rights that result in shared power of the activities that would most significantly impact the performance and benefit of such joint venture investment.
Accounting Estimates	The preparation of the consolidated financial statements in accordance with GAAP requires management to use estimates and assumptions that in certain circumstances affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities, and the reported revenues and expenses. Significant items subject to such estimates and assumptions include allocation of the purchase price of acquired real estate properties among tangible and intangible assets, determination of the useful life of real estate properties and other long-lived assets, valuation and impairment analysis of commercial real estate properties, goodwill, right-of-use assets and other long-lived and indefinite-lived assets, estimate of tenant expense reimbursements, valuation of the allowance for doubtful accounts, and valuation of derivative instruments, ground lease liabilities, senior unsecured notes, mortgage notes payable, unsecured revolving credit and term loan facilities, and equity based compensation. These estimates are prepared using management’s best judgment, after considering past, current, and expected events and economic conditions. Actual results could differ from those estimates.
Revenue Recognition and Other Revenues and Fees	Rental Revenue Rental revenue includes base rents that each tenant pays in accordance with the terms of its respective lease and is reported on a straight-line basis over the non-cancellable term of the lease which includes the effects of rent steps and rent abatements under the leases. In general, we commence rental revenue recognition when the tenant takes possession of the leased space or controls the physical use of the leased space and the leased space is substantially ready for its intended use. We account for all of our leases as operating leases. Deferred rent receivables, including free rental periods and leasing arrangements allowing for increased base rent payments, are accounted for in a manner that provides an even amount of fixed lease revenues over the respective non-cancellable lease terms. Differences between rental income recognized and amounts due under the respective lease agreements are recognized as an increase or decrease to deferred rent receivables. In addition to base rent, our tenants also generally will pay their pro rata share of increases in real estate taxes and operating expenses for the building over a base year. In some leases, in lieu of paying additional rent based upon increases in building operating expenses, the tenant will pay additional rent based upon increases in an index such as the Consumer Price Index over the index value in effect during a base year, or contain fixed percentage increases over the base rent to cover escalations. We recognize rental revenue of acquired in-place above- and below-market leases at their fair values over the terms of the respective leases, including, for below-market leases, fixed option renewal periods, if any. Lease termination fees are recognized when the fees are determinable, tenant vacancy has occurred, collectability is reasonably assured, we have no continuing obligation to provide services to such former tenants and the payment is not subject to any conditions that must be met or waived. Observatory Revenue Revenues from the sale of Observatory tickets are recognized upon admission or ticket expirations. Deferred revenue related to unused and unexpired tickets as of December 31, 2023 and 2022 was $1.7 million and $1.4 million, respectively, and is included in deferred revenue and other liabilities on the consolidated balance sheets. Gains on Sale/Disposition of Real Estate We record a gain on sale of real estate pursuant to provisions under Accounting Standards Codification (ASC) 610-20, Gains and Losses from the Derecognition of Nonfinancial Assets. Under ASC 610-20, we must first determine whether the transaction is a sale to a customer or non-customer. We do not sell real estate within the ordinary course of our business and therefore, expect that sale transactions will not be contracts with customers. We will next determine whether we would have a controlling financial interest in the property after the sale. If we determine that we do not have a controlling financial interest in the real estate, we would evaluate whether a contract exists under ASC 606 Revenue from Contracts with Customers and whether the buyer has obtained control of the asset that was sold. We recognize the full gain on sale of real estate when the derecognition criteria under ASC 610-20 have been met. Third-Party Management and Other Fees Other revenues and fees includes parking income, legal, tax and insurance settlements, demand response energy use earnings and sales from our restaurant at the Empire State Building.
Advertising and Marketing Costs	Advertising and marketing costs are expensed as incurred.
Real Estate Properties and Related Intangible Assets	Land and buildings and improvements are recorded at cost less accumulated depreciation and amortization. The recorded cost includes cost of acquisitions, development and construction and tenant allowances and improvements. Expenditures for ordinary repairs and maintenance are charged to property operating expense as incurred. Significant replacements and betterments which improve or extend the life of the asset are capitalized. Tenant improvements which improve or extend the life of the asset are capitalized. If a tenant vacates its space prior to the contractual termination of its lease, the unamortized balance of any tenant improvements are written off if they are replaced or have no future value. For developed properties, direct and indirect costs that clearly relate to projects under development are capitalized. Costs include construction costs, professional services such as architectural and legal costs, capitalized interest and direct payroll costs. We begin capitalization when the project is probable. The assets relating to the project are stated at cost and are not depreciated. Once construction is completed and the assets are placed in service, the assets are reclassified to the appropriate asset class and depreciated in accordance with the useful lives as indicated below. Capitalization of interest ceases when the asset is ready for its intended use, which is generally near the date that a certificate of occupancy is obtained. There was no capitalized interest for the years ended December 31, 2023 and 2022. Depreciation and amortization are computed using the straight-line method for financial reporting purposes. Buildings and improvements are depreciated over the shorter of 39 years, the useful life, or the remaining term of any leasehold interest. Tenant improvement costs, which are included in building and improvements in the consolidated balance sheets, are depreciated over the shorter of (i) the related remaining lease term or (ii) the life of the improvement. Corporate and other equipment is depreciated over three Acquisitions of properties are accounted for utilizing the acquisition method and accordingly the purchase cost is allocated to tangible and intangible assets and liabilities based on their fair values. The fair value of tangible assets acquired is determined by valuing the property as if it were vacant, applying methods similar to those used by independent appraisers of income-producing property. The resulting value is then allocated to land, buildings and improvements, and tenant improvements based on our determination of the fair value of these assets. The assumptions used in the allocation of fair values to assets acquired are based on our best estimates at the time of evaluation. Fair value is assigned to above-market and below-market leases based on the difference between (a) the contractual amounts to be paid by the tenant based on the existing lease and (b) our estimate of current market lease rates for the corresponding in-place leases, over the remaining terms of the in-place leases. Capitalized above-market lease amounts are amortized as a decrease to rental revenue over the remaining terms of the respective leases. Capitalized below-market lease amounts are amortized as an increase to rental revenue over the remaining terms of the respective leases. If a tenant vacates its space prior to the contractual termination of the lease and no rental payments are being made on the lease, any unamortized balance of the related intangible will be written off. The aggregate value of other acquired intangible assets consists of acquired ground leases and acquired in-place leases and tenant relationships. The fair value allocated to acquired in-place leases consists of a variety of components including, but not necessarily limited to: (a) the value associated with avoiding the cost of originating the acquired in-place leases (i.e. the market cost to execute a lease, including leasing commissions, if any); (b) the value associated with lost revenue related to tenant reimbursable operating costs estimated to be incurred during the assumed lease-up period (i.e. real estate taxes, insurance and other operating expenses); (c) the value associated with lost rental revenue from existing leases during the assumed lease-up period; and (d) the value associated with any other inducements to secure a tenant lease. We assess the potential for impairment of our long-lived assets, including real estate properties, annually or whenever events occur or a change in circumstances indicate that the recorded value might not be fully recoverable. We determine whether impairment in value has occurred by comparing the estimated future undiscounted cash flows expected from the use and eventual disposition of the asset to its carrying value. If the undiscounted cash flows do not exceed the carrying value, the real estate is adjusted to fair value and an impairment loss is recognized. Assets held for sale are recorded at the lower of cost or fair value less costs to sell and depreciation expense is no longer recorded.
Cash and Cash Equivalents	Cash and cash equivalents consist of cash on hand, government money markets, demand deposits with financial institutions and short-term liquid investments with original maturities of three months or less when purchased. Cash and cash equivalents held at major commercial banks may at times exceed the Federal Deposit Insurance Corporation limit. To date, we have not experienced any losses on our invested cash.
Restricted Cash	Restricted cash consists of amounts held for tenants in accordance with lease agreements such as security deposits and amounts held by lenders and/or escrow agents to provide for future real estate tax expenditures and insurance expenditures, tenant vacancy related costs and debt service obligations.
Short-term Investments	Short-term investments include time deposits with original maturities of greater than three months and remaining
Tenant and Other Receivables	Tenant and other receivables, other than deferred rent receivable, are generally expected to be collected within one year.
Deferred Leasing Costs and Deferred Financing Costs	Deferred leasing costs consist of fees incurred to initiate and renew leases, are amortized on a straight-line basis over the related lease term and the expense is included in depreciation and amortization in our consolidated statements of income. Upon the early termination of a lease, unamortized deferred leasing costs are charged to expense.Fees and costs incurred to obtain long-term financing have been deferred and are amortized as a component of interest expense in our consolidated statements of income over the life of the respective long-term financing on the straight-line method which approximates the effective interest method. Unamortized deferred financing costs are expensed when the associated debt is refinanced or repaid before maturity. Costs incurred in seeking debt, which do not close, are expensed in the period in which it is determined that the financing will not close.
Equity Method Investments	We account for investments under the equity method of accounting where we do not have control but have the ability to exercise significant influence. Under this method, investments are recorded at cost, and the investment accounts are adjusted for our share of the entities’ income or loss and for distributions and contributions. Equity income (loss) is allocated based on the portion of the ownership interest that is controlled by us. The agreements may designate different percentage allocations among investors for profits and losses; however, our recognition of the entity’s income or loss generally follows the entity’s distribution priorities, which may change upon the achievement of certain investment return thresholds. To the extent that we contributed assets to an entity, our investment in the entity is recorded at cost basis in the assets that were contributed to the entity. Upon contributing assets to an entity, we make a judgment as to whether the economic substance of the transaction is a sale. In accordance with the provisions of ASC 610-20, we will recognize a full gain on both the retained and sold portions of real estate contributed or sold to an entity by recognizing our new equity method investment interest at fair value. To the extent that the carrying amount of these investments on our combined balance sheets is different than the basis reflected at the entity level, the basis difference would be amortized over the life of the related asset and included in our share of equity in net income of the entity. On a periodic basis, we assess whether there are any indicators that the carrying value of our investments in entities may be impaired on an other than temporary basis. An investment is impaired only if management’s estimate of the fair value of the investment is less than the carrying value of the investment on an other than temporary basis. To the extent impairment has occurred, the loss shall be measured as the excess of the carrying value of the investment over the fair value of the investment.
Goodwill	Goodwill is tested annually for impairment and more frequently if events and circumstances indicate that the asset might be impaired. An impairment loss is recognized to the extent that the carrying amount, including goodwill, exceeds the reporting unit’s fair value and the implied fair value of goodwill is less than the carrying amount of that goodwill. Non-amortizing intangible assets, such as trade names and trademarks, are subject to an annual impairment test based on fair value and amortizing intangible assets are tested whenever events or changes in circumstances indicate that the carrying amount may not be recoverable.
Fair Value	Fair value is a market-based measurement, not an entity-specific measurement, and should be determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair value measurements, the FASB guidance establishes a fair value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within levels one and two of the hierarchy) and the reporting entity's own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). The methodologies used for valuing financial instruments have been categorized into three broad levels as follows: Level 1 - Quoted prices in active markets for identical instruments. Level 2 - Valuations based principally on other observable market parameters, including: • Quoted prices in active markets for similar instruments; • Quoted prices in less active or inactive markets for identical or similar instruments; • Other observable inputs (such as risk free interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks and default rates); and • Market corroborated inputs (derived principally from or corroborated by observable market data). Level 3 - Valuations based significantly on unobservable inputs, including: • Valuations based on third-party indications (broker quotes or counterparty quotes) which were, in turn, based significantly on unobservable inputs or were otherwise not supportable; and • Valuations based on internal models with significant unobservable inputs. These levels form a hierarchy. We follow this hierarchy for our financial instruments measured or disclosed at fair value on a recurring and nonrecurring basis and other required fair value disclosures. The classifications are based on the lowest level of input that is significant to the fair value measurement. We use the following methods and assumptions in estimating fair value disclosures for financial instruments. Cash and cash equivalents, restricted cash, short term investments, tenant and other receivables, prepaid expenses and other assets, deferred revenue, tenant security deposits, accounts payable and accrued expenses carrying values approximate their fair values due to the short term maturity of these instruments. The fair value of derivative instruments is determined using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Although the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by ourselves and our counterparties. The impact of such credit valuation adjustments, determined based on the fair value of each individual contract, was not significant to the overall valuation. As a result, all of our derivatives were classified as Level 2 of the fair value hierarchy. The fair value of our mortgage notes payable, senior unsecured notes (Series A, B, C, D, E, F, G and H), unsecured term loan facilities and unsecured revolving credit facility which are determined using Level 3 inputs are estimated by discounting the future cash flows using current interest rates at which similar borrowings could be made by us.
Derivative Instruments	We are exposed to the effect of interest rate changes and manage these risks by following policies and procedures including the use of derivatives. To manage exposure to interest rates, derivatives are used primarily to fix the rate on debt based on floating-rate indices. We record all derivatives on the balance sheet at fair value. We incorporate credit valuation adjustments to appropriately reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. We measure the credit risk of our derivative instruments that are subject to master netting agreements on a net basis by counterparty portfolio. For derivatives that qualify as cash flow hedges, we report the gain or loss on the derivative designated as a hedge as part of other comprehensive income (loss) and subsequently reclassify the gain or loss into income in the period that the hedged transaction affects income.
Income Taxes	We are generally not subject to federal and state income taxes as our taxable income or loss is reportable by our partners. Accordingly, no provision has been made for federal and state income taxes. ESRT has elected, together with ESRT Observatory TRS, L.L.C., our subsidiary that holds our Observatory operations, to treat ESRT Observatory TRS, L.L.C. as a TRS. ESRT has elected, together with ESRT Holdings TRS, L.L.C., our subsidiary that holds our third-party management, restaurant, cafeterias, health clubs and certain cleaning operations, to treat ESRT Holdings TRS, L.L.C. as a TRS. TRSs may participate in non-real estate activities and/or perform non-customary services for tenants and their operations are generally subject to regular corporate income taxes. Our TRSs account for their income taxes in accordance with GAAP, which includes an estimate of the amount of taxes payable or refundable for the current year and deferred tax liabilities and assets for the future tax consequences of events that have been recognized in our consolidated financial statements or tax returns. The calculation of the TRSs' tax provisions may require interpreting tax laws and regulations and could result in the use of judgments or estimates which could cause its recorded tax liability to differ from the actual amount due. Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. The TRSs periodically assess the realizability of deferred tax assets and the adequacy of deferred tax liabilities, including the results of local, state, or federal statutory tax audits or estimates and judgments used.
Share-Based Compensation	Share-based compensation for time-based equity awards is measured at the fair value of the award on the date of grant and recognized as an expense on a straight-line basis over the shorter of (i) the stated vesting period, which is generally three four three The determination of fair value of these awards is subjective and involves significant estimates and assumptions including expected volatility of ESRT stock, expected dividend yield, expected term, and assumptions of whether these awards will achieve parity with other operating partnership units or achieve performance thresholds. We believe that the assumptions and estimates utilized are appropriate based on the information available to management at the time of grant.
Per Unit Data	Basic and diluted earnings per unit are computed based upon the weighted average number of shares outstanding during the respective period.
Segment Reporting	We have identified two reportable segments: (1) Real Estate and (2) Observatory. Our real estate segment includes all activities related to the ownership, management, operation, acquisition, repositioning and disposition of our real estate assets. Our Observatory segment operates the 86th and 102nd floor observatories at the Empire State Building. These two lines of businesses are managed separately because each business requires different support infrastructures, provides different services and has dissimilar economic characteristics such as investments needed, stream of revenues and different marketing strategies. We account for intersegment sales and rent as if the sales or rent were to third parties, that is, at current market prices.
Recently Issued or Adopted Accounting Standards	During March 2020, the FASB issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848). ASU 2020-04 contains practical expedients for reference rate reform related activities that impact debt, leases, derivatives and other contracts. The guidance in ASU 2020-04 is optional and may be elected over time as reference rate reform activities occur. During the first quarter 2020, we elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions will be based matches the index on the corresponding derivatives. Application of these expedients preserves the presentation of derivatives consistent with past presentation. In December 2022, the FASB issued ASU 2022-06, Reference Rate Reform (Topic 848) Deferral of the Sunset Date of Topic 848 which deferred the sunset date of ASU 2022-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform to December 31, 2024. As of December 31, 2023, we have transitioned all of our LIBOR-indexed debt and derivatives to SOFR and applied the practical expedient allowed under the guidance. During November 2023, the Financial Accounting Standards Board issued Accounting Standards Update ("ASU") No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, to improve the disclosures about reportable segments and add more detailed information about a reportable segment’s expenses. The amendments in the ASU require public entities to disclose on an annual and interim basis significant segment expenses that are regularly provided to the chief operating decision maker (“CODM”) and included within each reported measure of segment profit or loss, other segment items and a description of its composition by reportable segment, the title and position of the CODM, and an explanation of how the CODM uses the reported measures of segment profit or loss in assessing segment performance and deciding how to allocate resources. The ASU does not change the definition of a segment, the method for determining segments, the criteria for aggregating operating segments into reportable segments, or the current specifically enumerated segment expenses that are required to be disclosed. The amendments in this ASU are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. We are evaluating the impact of adopting this new accounting standard on our consolidated financial statements.

Acquisitions and Dispositions (

Acquisitions and Dispositions (Tables)	12 Months Ended
	Dec. 31, 2023
Business Combination and Dispositions [Abstract]
Schedule of Properties Acquired	The following table summarizes properties acquired during the years ended December 31, 2023, 2022 and 2021 (amounts in thousands): Intangibles Property Date Acquired Land Building and Improvements Assets Liabilities Total* Williamsburg Retail, Brooklyn 9/14/2023 $ 4,851 $ 20,936 $ 1,573 $ (300) $ 27,060 298 Mulberry Street, Manhattan 12/20/2022 $ 40,935 $ 69,508 $ 5,300 $ (150) $ 115,593 The Victory 12/21/2021 91,437 124,997 13,573 (19,895) $ 210,112 345 East 94th St. 12/21/2021 44,228 55,766 4,824 (5,491) $ 99,327 *Includes total capitalized transaction costs of $3.8 million.
Schedule of Properties Disposed	The following table summarizes properties disposed of during the years ended December 31, 2023 and 2022 (amounts in thousands): Property Date of Disposal Sales Price Gain on Disposition 500 Mamaroneck Avenue, Harrison, New York* 4/5/2023 $ 53,000 $ 11,075 69-97 and 103-107 Main Street, Westport, Connecticut 2/1/2023 $ 40,000 $ 15,689 10 Bank Street, White Plains, New York 12/7/2022 $ 42,000 $ 6,818 383 Main Avenue, Norwalk, Connecticut** 4/1/2022 $ 30,000 $ 27,170 *The gain is net of approximately $4.5 million of post-closing costs we accrued related to expected contaminated soil remediation costs and our commitment to reimburse the buyer for a delay in rent commencement from a tenant impacted by the soil remediation efforts. Subsequent to December 31, 2023, we funded the buyer for these costs and we have no further obligations or contingencies that relate to this property. **We transferred the property, which was encumbered by a $30.0 million mortgage, back to the lender in a consensual foreclosure and recognized a non-cash gain upon the disposition.

Deferred Costs, Acquired Leas_2

Deferred Costs, Acquired Lease Intangibles and Goodwill (Tables)	12 Months Ended
	Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Deferred Costs, Net	Deferred costs, net, consisted of the following at December 31, 2023 and 2022 (amounts in thousands): 2023 2022 Leasing costs $ 224,295 $ 218,707 Acquired in-place lease value and deferred leasing costs 158,267 160,683 Acquired above-market leases 23,918 27,833 406,480 407,223 Less: accumulated amortization (236,900) (223,246) Total deferred costs, net, excluding net deferred financing costs $ 169,580 $ 183,977 Deferred financing costs, net, consisted of the following at December 31, 2023 and 2022 (amounts in thousands): 2023 2022 Financing costs $ 43,473 $ 43,473 Less: accumulated amortization (31,108) (26,753) Total deferred financing costs, net $ 12,365 $ 16,720
Schedule of Amortizing Acquired Intangible Assets and Liabilities	Amortizing acquired intangible assets and liabilities consisted of the following at December 31, 2023 and 2022 (amounts in thousands): 2023 2022 Acquired below-market ground leases $ 396,916 $ 396,916 Less: accumulated amortization (75,675) (67,843) Acquired below-market ground leases, net $ 321,241 $ 329,073 2023 2022 Acquired below-market leases $ (55,155) $ (64,656) Less: accumulated amortization 41,405 46,807 Acquired below-market leases, net $ (13,750) $ (17,849)
Schedule of Future Amortization Expense and Rental Revenue from Acquired Intangible Assets	We expect to recognize amortization expense and rental revenue from the acquired intangible assets and liabilities as follows (amounts in thousands): For the year ending: Future Ground Rent Amortization Future Amortization Expense Future Rental Revenue (Expense) 2024 $ 7,831 $ 7,430 $ 1,977 2025 7,831 6,481 1,914 2026 7,831 5,593 1,116 2027 7,831 4,930 882 2028 7,831 4,297 854 Thereafter 282,086 4,110 (124) $ 321,241 $ 32,841 $ 6,619

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of Debt	Debt consisted of the following as of December 31, 2023 and 2022 (amounts in thousands): As of December 31, 2023 Principal Balance as Principal Balance as Stated Effective (1) Maturity (2) Fixed rate mortgage debt Metro Center $ 80,070 $ 82,596 3.59 % 3.67 % 11/5/2024 10 Union Square 50,000 50,000 3.70 % 3.97 % 4/1/2026 1542 Third Avenue 30,000 30,000 4.29 % 4.53 % 5/1/2027 First Stamford Place (3) 175,860 178,823 4.28 % 4.73 % 7/1/2027 1010 Third Avenue and 77 West 55th Street 34,958 35,831 4.01 % 4.21 % 1/5/2028 250 West 57th Street 180,000 180,000 2.83 % 3.21 % 12/1/2030 1333 Broadway 160,000 160,000 4.21 % 4.29 % 2/5/2033 345 East 94th Street - Series A 43,600 43,600 70.0% of SOFR plus 0.95% 3.56 % 11/1/2030 345 East 94th Street - Series B 7,209 7,865 SOFR plus 2.24% 3.56 % 11/1/2030 561 10th Avenue - Series A 114,500 114,500 70.0% of SOFR plus 1.07% 3.85 % 11/1/2033 561 10th Avenue - Series B 15,801 17,415 SOFR plus 2.45% 3.85 % 11/1/2033 Total fixed rate mortgage debt 891,998 900,630 Senior unsecured notes: (4) Series A 100,000 100,000 3.93 % 3.96 % 3/27/2025 Series B 125,000 125,000 4.09 % 4.12 % 3/27/2027 Series C 125,000 125,000 4.18 % 4.21 % 3/27/2030 Series D 115,000 115,000 4.08 % 4.11 % 1/22/2028 Series E 160,000 160,000 4.26 % 4.27 % 3/22/2030 Series F 175,000 175,000 4.44 % 4.45 % 3/22/2033 Series G 100,000 100,000 3.61 % 4.89 % 3/17/2032 Series H 75,000 75,000 3.73 % 5.00 % 3/17/2035 Unsecured revolving credit facility (4) — — SOFR plus 1.30% — % 3/31/2025 Unsecured term loan facility (4) 215,000 215,000 SOFR plus 1.20% 4.22 % 3/19/2025 Unsecured term loan facility (4) 175,000 175,000 SOFR plus 1.50% 4.51 % 12/31/2026 Total principal 2,256,998 2,265,630 Deferred financing costs, net (9,488) (11,748) Unamortized debt discount (6,964) (7,745) Total $ 2,240,546 $ 2,246,137 _____________ (1) The effective rate is the yield as of December 31, 2023 and includes the stated interest rate, deferred financing cost amortization and interest associated with variable to fixed interest rate swap agreements. (2) Pre-payment is generally allowed for each loan upon payment of a customary pre-payment penalty. (3) Represents a $164.0 million mortgage loan bearing interest of 4.09% and a $11.9 million loan bearing interest at 6.25%. (4) At December 31, 2023, we were in compliance with all debt covenants.
Schedule of Aggregate Required Principal Payments	Aggregate required principal payments at December 31, 2023 are as follows (amounts in thousands): Year Amortization Maturities Total 2024 $ 8,861 $ 77,675 $ 86,536 2025 6,893 315,000 321,893 2026 7,330 225,000 232,330 2027 6,461 319,000 325,461 2028 3,556 146,092 149,648 Thereafter 18,523 1,122,607 1,141,130 Total principal maturities $ 51,624 $ 2,205,374 $ 2,256,998
Schedule of Deferred Costs, Net	Deferred costs, net, consisted of the following at December 31, 2023 and 2022 (amounts in thousands): 2023 2022 Leasing costs $ 224,295 $ 218,707 Acquired in-place lease value and deferred leasing costs 158,267 160,683 Acquired above-market leases 23,918 27,833 406,480 407,223 Less: accumulated amortization (236,900) (223,246) Total deferred costs, net, excluding net deferred financing costs $ 169,580 $ 183,977 Deferred financing costs, net, consisted of the following at December 31, 2023 and 2022 (amounts in thousands): 2023 2022 Financing costs $ 43,473 $ 43,473 Less: accumulated amortization (31,108) (26,753) Total deferred financing costs, net $ 12,365 $ 16,720

Accounts Payable and Accrued _2

Accounts Payable and Accrued Expenses (Tables)	12 Months Ended
	Dec. 31, 2023
Payables and Accruals [Abstract]
Schedule of Accounts Payable and Accrued Expenses	Accounts payable and accrued expenses consist of the following as of December 31, 2023 and 2022 (amounts in thousands): 2023 2022 Accrued capital expenditures $ 51,815 $ 44,293 Accounts payable and accrued expenses 44,169 32,927 Interest rate swap agreements liability 85 — Accrued interest payable 3,687 3,509 Total accounts payable and accrued expenses $ 99,756 $ 80,729

Financial Instruments and Fai_2

Financial Instruments and Fair Values (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of the Terms of Agreements and Fair Values of Derivative Financial Instruments	The table below summarizes the terms of agreement and the fair value of our derivative financial instruments as of December 31, 2023 and 2022 (dollar amounts in thousands): December 31, 2023 December 31, 2022 Derivative Notional Amount Receive Rate Pay Rate Effective Date Expiration Date Asset Liability Asset Liability Interest rate swap $ 36,820 70% of 1 Month SOFR 2.5000 % December 1, 2021 November 1, 2030 $ 64 $ — $ 256 $ — Interest rate swap 103,790 70% of 1 Month SOFR 2.5000 % December 1, 2021 November 1, 2033 — (85) 365 — Interest rate swap 10,710 70% of 1 Month SOFR 1.7570 % December 1, 2021 November 1, 2033 546 — 643 — Interest rate swap 15,942 1 Month SOFR 2.2540 % December 1, 2021 November 1, 2030 782 — 1,070 — Interest rate cap 6,780 70% of 1 Month SOFR 4.5000 % December 1, 2021 October 1, 2024 — — 8 — Interest rate cap 9,188 1 Month SOFR 5.5000 % December 1, 2021 October 1, 2024 4 — 26 — Interest rate swap 175,000 SOFR Compound 2.5620 % August 31, 2022 December 31, 2026 5,637 — 8,040 — Interest rate swap 107,500 SOFR Compound 2.6260 % August 19, 2022 March 19, 2025 2,384 — 3,766 — Interest rate swap 107,500 SOFR OIS Compound 2.6280 % August 19, 2022 March 19, 2025 2,383 — 3,762 — $ 11,800 $ (85) $ 17,936 $ —
Schedule of Effect of Derivative Financial Instruments Designated as Cash Flow Hedges	The table below shows the effect of our derivative financial instruments designated as cash flow hedges on accumulated other comprehensive income (loss) for the years ended December 31, 2023, 2022 and 2021 (amounts in thousands): Effects of Cash Flow Hedges December 31, 2023 December 31, 2022 December 31, 2021 Amount of gain recognized in other comprehensive income (loss) $ 5,581 $ 40,044 $ 348 Amount of loss (gain) reclassified from accumulated other comprehensive income (loss) into interest expense 7,819 (7,230) (11,653) The table below shows the effect of our derivative financial instruments designated as cash flow hedges on the consolidated statements of operations for the years ended December 31, 2023, 2022 and 2021 (amounts in thousands): Effects of Cash Flow Hedges December 31, 2023 December 31, 2022 December 31, 2021 Total interest expense presented on the consolidated statements of income in which the effects of cash flow hedges are recorded $ (101,484) (101,206) (94,394) Amount of loss (gain) reclassified from accumulated other comprehensive income (loss) into interest expense 7,819 (7,230) (11,653)
Schedule of Carrying and Estimated Fair Values of Financial Instruments	The following tables summarize the carrying and estimated fair values of our financial instruments as of December 31, 2023 and 2022 (amounts in thousands): December 31, 2023 Carrying Value Estimated Fair Value Total Level 1 Level 2 Level 3 Interest rate swaps included in prepaid expenses and other assets $ 11,800 $ 11,800 $ — $ 11,800 $ — Interest rate swaps included in accounts payable and accrued expenses 85 85 — 85 — Mortgage notes payable 877,388 774,280 — — 774,280 Senior unsecured notes - Series A, B, C, D, E, F, G and H 973,872 882,242 — — 882,242 Unsecured term loan facilities 389,286 390,000 — — 390,000 December 31, 2022 Carrying Value Estimated Fair Value Total Level 1 Level 2 Level 3 Interest rate swaps included in prepaid expenses and other assets $ 17,936 $ 17,936 $ — $ 17,936 $ — Mortgage notes payable 883,705 783,648 — — 783,648 Senior unsecured notes - Series A, B, C, D, E, F, G and H 973,659 865,292 — — 865,292 Unsecured term loan facility 388,773 390,000 — — 390,000

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2023
Leases [Abstract]
Schedule of Components of Rental Revenue	The components of rental revenue for the years ended December 31, 2023, 2022 and 2021 are as follows (amounts in thousands): Year Ended December 31, Rental revenue 2023 2022 2021 Fixed payments $ 529,965 $ 531,740 $ 500,847 Variable payments 67,354 59,308 58,843 Total rental revenue $ 597,319 $ 591,048 $ 559,690
Schedule of Future Contractual Minimum Lease Payments On Non-Cancellable Operating Leases To Be Received	As of December 31, 2023, we were entitled to the following future contractual minimum lease payments (excluding operating expense reimbursements) on non-cancellable operating leases to be received which expire on various dates through 2040 (amounts in thousands): 2024 $ 513,589 2025 499,154 2026 453,645 2027 434,447 2028 395,858 Thereafter 1,646,769 $ 3,943,462
Schedule of Future Minimum Lease Payments	As of December 31, 2023, the following table summarizes our future minimum lease payments discounted by our incremental borrowing rates to calculate the lease liabilities of our leases (amounts in thousands): 2024 $ 1,518 2025 1,518 2026 1,503 2027 1,482 2028 1,482 Thereafter 60,795 Total undiscounted lease payments 68,298 Present value discount (39,859) Ground lease liabilities $ 28,439

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments and Contingencies Disclosure [Abstract]
Schedule of Percent of Total Rental Revenue	For the years ended December 31, 2023, 2022 and 2021, the three properties listed below each exceeded 10% of total rental revenues. Year Ended December 31, 2023 2022 2021 Empire State Building 29.6 % 29.9 % 31.7 % One Grand Central Place 12.8 % 12.4 % 12.6 % 111 West 33rd Street 10.8 % 11.2 % 11.3 %
Schedule of Contributions to Multiemployer Plans	Contributions we made to the multi-employer plans for the years ended December 31, 2023 , 2022 and 2021 are included in the table below (amounts in thousands): For the Year Ended December 31, Benefit Plan 2023 2022 2021 Pension Plans (pension and annuity)* $ 3,671 $ 2,958 $ 2,165 Health Plans** 8,812 8,618 6,214 Other*** 434 460 305 Total plan contributions $ 12,917 $ 12,036 $ 8,684 * Pension plans include $0.8 million, $0.8 million and $0.7 million for the years ended 2023, 2022 and 2021, respectively, to multiemployer plans not discussed above. ** Health plans include $1.6 million, $1.5 million and $1.4 million for the years ended 2023, 2022 and 2021, respectively, to multiemployer plans not discussed above.

Capital (Tables)

Capital (Tables)	12 Months Ended
	Dec. 31, 2023
Equity [Abstract]
Schedule of Purchases of Equity Securities	The following table summarizes our purchases of equity securities for the year ended December 31, 2023 under the previous repurchase program. Period Total Number of Shares Purchased Average Price Paid Per Share Total Number of Shares Purchased as Part of Publicly Announced Plan Maximum Approximate Dollar Value Available for Future Purchases Year ended December 31, 2023 2,150,857 $ 6.09 2,150,857 $500,000,000 (a) (a) Represents the new board authorization for the January 1, 2024 - December 31, 2025 period. As of the date of this filing, we have used $0 of such $500 million authorization.
Schedule of Distributions Paid on Operating Partnership Units	The following table summarizes the distributions paid on our operating partnership units for the years ended December 31, 2023, 2022 and 2021: Record Date Payment Date Amount per Operating Partnership Unit December 18, 2023 December 29, 2023 $0.035 September 15, 2023 September 29, 2023 $0.035 June 15, 2023 June 30, 2023 $0.035 March 15, 2023 March 31, 2023 $0.035 December 19, 2022 December 31, 2022 $0.035 September 15, 2022 September 30, 2022 $0.035 June 15, 2022 June 30, 2022 $0.035 March 15, 2022 March 31, 2022 $0.035 December 20, 2021 December 31, 2021 $0.035 September 15, 2021 September 30, 2021 $0.035 June 15, 2021 June 30, 2021 $0.035
Schedule of ESRT Restricted Stock and LTIP Unit Activity	The following is a summary of ESRT restricted stock and LTIP unit activity for the year ended December 31, 2023: ESRT Restricted Stock Time-based LTIPs Market-based LTIPs Performance-based LTIPs Weighted Average Grant Fair Value Unvested balance at December 31, 2022 359,293 2,713,522 4,070,537 510,989 $ 6.69 Vested (121,128) (1,148,987) (582,800) (2,011) 7.17 Granted 370,465 1,733,015 946,398 771,180 5.67 Forfeited or unearned (10,341) — (1,695,323) (3,795) 4.30 Unvested balance at December 31, 2023 598,289 3,297,550 2,738,812 1,276,363 $ 6.60
Schedule of Earnings Per Unit	Earnings per unit for the years ended December 31, 2023, 2022 and 2021 is computed as follows (amounts in thousands, except per share amounts): For the Year Ended December 31, 2023 2022 2021 Numerator: Net income (loss) $ 84,407 $ 63,212 $ (13,037) Private perpetual preferred unit distributions (4,201) (4,201) (4,201) Net (income) loss attributable to non-controlling interests in other partnerships (68) 243 — Earnings allocated to unvested shares — — (340) Net income (loss) attributable to common unitholders - basic and diluted $ 80,138 $ 59,254 $ (17,578) Denominator: Weighted average units outstanding - basic 263,226 268,337 277,420 Effect of dilutive securities: Stock-based compensation plans 2,407 1,611 — Weighted average shares outstanding - diluted 265,633 269,948 277,420 Earnings per unit - basic and diluted $ 0.30 $ 0.22 $ (0.06)

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Schedule of Components of Income Tax Expense (Benefit)	Holdings TRS and Observatory TRS are taxable entities and their consolidated provision for income taxes consisted of the following for the years ended December 31, 2023, 2022 and 2021 (amounts in thousands): For the Year Ended December 31, 2023 2022 2021 Current: Federal $ (783) $ (319) $ (266) State and local (695) (227) (347) Total current (1,478) (546) (613) Deferred: Federal (710) (264) 1,206 State and local (527) (736) 1,141 Total deferred (1,237) (1,000) 2,347 Income tax (expense) benefit $ (2,715) $ (1,546) $ 1,734
Schedule of Actual Tax Provision Differed From Federal Statutory Corporate Rate	For the Year Ended December 31, 2023 2022 2021 Federal tax benefit (expense) at statutory rate $ (1,494) $ (583) $ 940 State income tax benefit (expense), net of federal benefit (1,221) (963) 794 Income tax (expense) benefit $ (2,715) $ (1,546) $ 1,734
Schedule of Deferred Tax Assets and Liabilities	The income tax effects of temporary differences that give rise to deferred tax assets are presented below as of December 31, 2023, 2022 and 2021 (amounts in thousands): 2023 2022 2021 Deferred tax assets: Deferred revenue on unredeemed Observatory admission ticket sales $ 616 $ 535 $ 383 Federal net operating loss carryforward credit 328 969 1,393 New York State net operating loss carryforward credit — 250 612 New York City net operating loss carryforward credit — 233 704 Other deferred tax assets 161 261 — Deferred tax assets $ 1,105 $ 2,248 $ 3,092

Segment Reporting (Tables)

Segment Reporting (Tables)	12 Months Ended
	Dec. 31, 2023
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following tables provide components of segment profit for each segment for the years ended December 31, 2023, 2022 and 2021 (amounts in thousands): 2023 Real Estate Observatory Intersegment Elimination Total Revenues: Rental revenue $ 597,319 $ — $ — $ 597,319 Intercompany rental revenue 80,514 — (80,514) — Observatory revenue — 129,366 — 129,366 Lease termination fees — — — — Third-party management and other fees 1,351 — — 1,351 Other revenue and fees 11,536 — — 11,536 Total revenues 690,720 129,366 (80,514) 739,572 Operating expenses: Property operating expenses 167,324 — — 167,324 Intercompany rent expense — 80,514 (80,514) — Ground rent expenses 9,326 — — 9,326 General and administrative expenses 63,939 — — 63,939 Observatory expenses — 35,265 — 35,265 Real estate taxes 127,101 — — 127,101 Depreciation and amortization 189,762 149 — 189,911 Total operating expenses 557,452 115,928 (80,514) 592,866 Total operating income 133,268 13,438 — 146,706 Other income (expense): Interest income 14,936 200 — 15,136 Interest expense (101,484) — — (101,484) Gain on sale/disposition of properties 26,764 — — 26,764 Income before income taxes 73,484 13,638 — 87,122 Income tax expense (552) (2,163) — (2,715) Net income $ 72,932 $ 11,475 $ — $ 84,407 Segment assets $ 3,957,659 $ 261,674 $ — $ 4,219,333 Expenditures for segment assets $ 169,044 $ 111 $ — $ 169,155 2022 Real Estate Observatory Intersegment Elimination Total Revenues: Rental revenue $ 591,048 $ — $ — $ 591,048 Intercompany rental revenue 65,005 — (65,005) — Observatory revenue — 105,978 — 105,978 Lease termination fees 20,032 — — 20,032 Third-party management and other fees 1,361 — — 1,361 Other revenue and fees 8,622 — — 8,622 Total revenues 686,068 105,978 (65,005) 727,041 Operating expenses: Property operating expenses 157,935 — — 157,935 Intercompany rent expense — 65,005 (65,005) — Ground rent expenses 9,326 — — 9,326 General and administrative expenses 61,765 — — 61,765 Observatory expenses — 31,036 — 31,036 Real estate taxes 123,057 — — 123,057 Impairment charge — — — — Depreciation and amortization 216,707 187 — 216,894 Total operating expenses 568,790 96,228 (65,005) 600,013 Total operating income (loss) 117,278 9,750 — 127,028 Other income (expense): Interest income 4,901 47 — 4,948 Interest expense (101,206) — — (101,206) Gain on sale/disposition of properties 33,988 — — 33,988 Income before income taxes 54,961 9,797 — 64,758 Income tax (expense) benefit (584) (962) — (1,546) Net income $ 54,377 $ 8,835 $ — $ 63,212 Segment assets $ 3,909,299 $ 254,295 $ — $ 4,163,594 Expenditures for segment assets $ 85,646 $ 315 $ — $ 85,961 2021 Real Estate Observatory Intersegment Elimination Total Revenues: Rental revenue $ 559,690 $ — $ — $ 559,690 Intercompany rental revenue 23,413 — (23,413) — Observatory revenue — 41,474 — 41,474 Lease termination fees 16,230 — — 16,230 Third-party management and other fees 1,219 — — 1,219 Other revenue and fees 5,343 138 — 5,481 Total revenues 605,895 41,612 (23,413) 624,094 Operating expenses: Property operating expenses 126,986 — — 126,986 Intercompany rent expense — 23,413 (23,413) — Ground rent expenses 9,326 — — 9,326 General and administrative expenses 55,947 — — 55,947 Observatory expenses — 23,206 — 23,206 Real estate taxes 119,967 — — 119,967 Impairment charges 7,723 — — 7,723 Depreciation and amortization 201,676 130 — 201,806 Total operating expenses 521,625 46,749 (23,413) 544,961 Total operating income (loss) 84,270 (5,137) — 79,133 Other income (expense): Interest income 701 3 — 704 Interest expense (94,292) (102) — (94,394) Loss on early extinguishment of debt (214) — — (214) Loss before income taxes (9,535) (5,236) — (14,771) Income tax (expense) benefit (613) 2,347 — 1,734 Net loss $ (10,148) $ (2,889) $ — $ (13,037) Segment assets $ 4,037,122 $ 245,325 $ — $ 4,282,447 Expenditures for segment assets $ 398,368 $ 4 $ — $ 398,372

Description of Business and O_2

Description of Business and Organization (Details) ft² in Millions	12 Months Ended
	Dec. 31, 2023 ft² office_property property_unit parcel entity $ / shares
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of entities to be treated as taxable REIT subsidiary of ESRT | entity	2
Empire State Realty OP | Empire State Realty Trust
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
OP units owned by the company (as a percent)	60.20%
ESRT | Common Class A
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Par value (in dollars per share) | $ / shares	$ 0.01
Office Building
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	8.6
Number of offices and properties | office_property	11
Office Building | Manhattan
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	7.6
Number of offices and properties | office_property	9
Office Building | Stamford, Connecticut
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	1.1
Number of offices and properties | office_property	2
Retail Site
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Area of real estate property (in square feet)	0.7
multi-family
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of property units | property_unit	727
multi-family | New York City
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of property units | property_unit	727
Development Parcel
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of offices and properties | parcel	3

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Accounting Policies [Line Items]
Deferred revenue	$ 1,700,000	$ 1,400,000
Advertising and marketing expense	10,900,000	10,800,000	$ 7,900,000
Capitalized interest	0	0
Equity method investments	$ 0	$ 0
Number of reportable segments | segment	2
Granted In 2020 And After
Accounting Policies [Line Items]
Retirement age (in years)	65 years
Granted Before 2020
Accounting Policies [Line Items]
Retirement age (in years)	60 years
Minimum | Time-based LTIPs
Accounting Policies [Line Items]
Award vesting period (in years)	3 years
Minimum | Market-based LTIPs
Accounting Policies [Line Items]
Award vesting period (in years)	3 years
Maximum | Time-based LTIPs
Accounting Policies [Line Items]
Award vesting period (in years)	5 years
Maximum | Market-based LTIPs
Accounting Policies [Line Items]
Award vesting period (in years)	4 years
Median | Time-based LTIPs
Accounting Policies [Line Items]
Award vesting period (in years)	4 years
Building and Building Improvements
Accounting Policies [Line Items]
Useful life (in years)	39 years
Impairment charges			$ 7,700,000
Corporate Equipment | Minimum
Accounting Policies [Line Items]
Useful life (in years)	3 years
Corporate Equipment | Maximum
Accounting Policies [Line Items]
Useful life (in years)	7 years

Acquisitions and Dispositions -

Acquisitions and Dispositions - Narrative (Details) $ in Millions	Sep. 14, 2023 USD ($) property	Dec. 20, 2022 USD ($) property_unit	Dec. 22, 2021 USD ($) multifamily_asset property_unit	Dec. 31, 2023 ft²	Dec. 21, 2021 ft²
Victory (561 10th Avenue) and 345 East 94th Street | Previous Owner
Business Acquisition [Line Items]
Ownership retention percentage (as a percent)			10%
Retail Site
Business Acquisition [Line Items]
Area of real estate property (in square feet) | ft²				700,000
Williamsburg Retail
Business Acquisition [Line Items]
Consideration paid	$ 26.4
Williamsburg Retail | Retail Site
Business Acquisition [Line Items]
Number of businesses acquired | property	3
Williamsburg Retail | Residential
Business Acquisition [Line Items]
Number of businesses acquired | property	6
298 Mulberry
Business Acquisition [Line Items]
Consideration paid		$ 114.9
Number of property units | property_unit		96
Victory (561 10th Avenue) and 345 East 94th Street
Business Acquisition [Line Items]
Consideration paid			$ 307
Number of businesses acquired | multifamily_asset			2
Proportion of interest acquired (as a percent)			90%
The Victory
Business Acquisition [Line Items]
Debt assumed			$ 134
Effective rate (as a percent)			3.85%
Number of units | property_unit			417
Area of real estate property (in square feet) | ft²					11,000
345 East 94th St.
Business Acquisition [Line Items]
Debt assumed			$ 52
Effective rate (as a percent)			3.56%
Number of units | property_unit			208

Acquisitions and Dispositions_2

Acquisitions and Dispositions - Schedule of Properties Acquired (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 14, 2023	Dec. 20, 2022	Dec. 21, 2021
Business Acquisition [Line Items]
Capitalized transaction costs	$ 3,800
Williamsburg Retail, Brooklyn
Business Acquisition [Line Items]
Land		$ 4,851
Building and Improvements		20,936
Intangible Assets		1,573
Intangible Liabilities		(300)
Total		$ 27,060
298 Mulberry Street, Manhattan
Business Acquisition [Line Items]
Land			$ 40,935
Building and Improvements			69,508
Intangible Assets			5,300
Intangible Liabilities			(150)
Total			$ 115,593
The Victory
Business Acquisition [Line Items]
Land				$ 91,437
Building and Improvements				124,997
Intangible Assets				13,573
Intangible Liabilities				(19,895)
Total				210,112
345 East 94th St.
Business Acquisition [Line Items]
Land				44,228
Building and Improvements				55,766
Intangible Assets				4,824
Intangible Liabilities				(5,491)
Total				$ 99,327

Acquisitions and Dispositions_3

Acquisitions and Dispositions - Schedule of Properties Disposed (Details) - USD ($) $ in Thousands					12 Months Ended
	Apr. 05, 2023	Feb. 01, 2023	Dec. 07, 2022	Apr. 01, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Gain on Disposition					$ 26,764	$ 33,988	$ 0
Mortgage notes payable, net					$ 877,388	$ 883,705
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 500 Mamaroneck Avenue, Harrison, New York
Business Acquisition [Line Items]
Sales Price	$ 53,000
Gain on Disposition	11,075
Estimated post-closing obligations	$ 4,500
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 69-97 and 103-107 Main Street, Westport, Connecticut
Business Acquisition [Line Items]
Sales Price		$ 40,000
Gain on Disposition		$ 15,689
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 10 Bank Street, White Plains, New York
Business Acquisition [Line Items]
Sales Price			$ 42,000
Gain on Disposition			$ 6,818
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 383 Main Avenue, Norwalk, Connecticut
Business Acquisition [Line Items]
Sales Price				$ 30,000
Gain on Disposition				27,170
Mortgage notes payable, net				$ 30,000

Deferred Costs, Acquired Leas_3

Deferred Costs, Acquired Lease Intangibles and Goodwill - Schedule of Deferred Costs, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Leasing costs	$ 224,295	$ 218,707
Total deferred costs, gross amount	406,480	407,223
Less: accumulated amortization	(236,900)	(223,246)
Total deferred costs, net, excluding net deferred financing costs	169,580	183,977
Acquired in-place lease value and deferred leasing costs
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets	158,267	160,683
Acquired above-market leases
Finite-Lived Intangible Assets [Line Items]
Acquired finite-lived intangible assets	$ 23,918	$ 27,833

Deferred Costs, Acquired Leas_4

Deferred Costs, Acquired Lease Intangibles and Goodwill - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2013
Deferred Costs [Line Items]
Amortization of deferred leasing and acquired deferred leasing costs	$ 23,600	$ 25,400	$ 28,600
Amortization of acquired above and below-market leases, net	2,415	4,759	5,896
Goodwill	491,479	491,479
Empire State Building observatory operations
Deferred Costs [Line Items]
Goodwill				$ 227,500
Empire State Building
Deferred Costs [Line Items]
Goodwill				250,800
501 Seventh Avenue
Deferred Costs [Line Items]
Goodwill				$ 13,200
Future Amortization Expense
Deferred Costs [Line Items]
Amortization expense related to acquired lease intangibles	$ 7,400	11,800	$ 10,500
Future Ground Rent Amortization
Deferred Costs [Line Items]
Weighted-average amortization period (in years)	22 years 2 months 12 days
In-place leases and deferred leasing costs
Deferred Costs [Line Items]
Weighted-average amortization period (in years)	3 years 4 months 24 days
Above-market leases
Deferred Costs [Line Items]
Weighted-average amortization period (in years)	3 years 6 months
Below-market Lease
Deferred Costs [Line Items]
Weighted-average amortization period (in years)	2 years 10 months 24 days
Revolving Credit Facility | Credit Facility - Revolving Credit Facility
Deferred Costs [Line Items]
Net deferred financing costs	$ 2,900	$ 5,000

Deferred Costs, Acquired Leas_5

Deferred Costs, Acquired Lease Intangibles and Goodwill - Acquired Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Acquired below-market ground leases, net
Acquired below-market ground leases	$ 396,916	$ 396,916
Less: accumulated amortization	(75,675)	(67,843)
Acquired below-market ground leases, net	321,241	329,073
Acquired below-market leases, net
Acquired below-market leases	(55,155)	(64,656)
Less: accumulated amortization	41,405	46,807
Acquired below-market leases, net	$ (13,750)	$ (17,849)

Deferred Costs, Acquired Leas_6

Deferred Costs, Acquired Lease Intangibles and Goodwill - Future Amortization Expense and Rental Revenue (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Future Rental Revenue (Expense)
2024	$ 1,977
2025	1,914
2026	1,116
2027	882
2028	854
Thereafter	(124)
Future Rental Revenue (Expense)	6,619
Future Ground Rent Amortization
Future Amortization Expense [Abstract]
2024	7,831
2025	7,831
2026	7,831
2027	7,831
2028	7,831
Thereafter	282,086
Future Amortization Expense	321,241
Future Amortization Expense
Future Amortization Expense [Abstract]
2024	7,430
2025	6,481
2026	5,593
2027	4,930
2028	4,297
Thereafter	4,110
Future Amortization Expense	$ 32,841

Debt - Schedule of Debt (Detail

Debt - Schedule of Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 0	$ 0
Total principal	2,256,998,000
Deferred financing costs, net	(12,365,000)	(16,720,000)
Mortgages, senior notes, and unsecured term loan facilities, not including unsecured revolving credit facility
Debt Instrument [Line Items]
Total principal	2,256,998,000	2,265,630,000
Deferred financing costs, net	(9,488,000)	(11,748,000)
Unamortized debt discount	(6,964,000)	(7,745,000)
Total	2,240,546,000	2,246,137,000
Metro Center | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 80,070,000	82,596,000
Stated rate (as a percent)	3.59%
Effective rate (as a percent)	3.67%
10 Union Square | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 50,000,000	50,000,000
Stated rate (as a percent)	3.70%
Effective rate (as a percent)	3.97%
1542 Third Avenue | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 30,000,000	30,000,000
Stated rate (as a percent)	4.29%
Effective rate (as a percent)	4.53%
First Stamford Place | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 175,860,000	178,823,000
Stated rate (as a percent)	4.28%
Effective rate (as a percent)	4.73%
First Stamford Place - First Lien | Fixed rate mortgage debt
Debt Instrument [Line Items]
Stated rate (as a percent)	4.09%
Face amount	$ 164,000,000
First Stamford Place - Second Lien | Fixed rate mortgage debt
Debt Instrument [Line Items]
Stated rate (as a percent)	6.25%
Face amount	$ 11,900,000
1010 Third Avenue and 77 West 55th Street | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 34,958,000	35,831,000
Stated rate (as a percent)	4.01%
Effective rate (as a percent)	4.21%
250 West 57th Street | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 180,000,000	180,000,000
Stated rate (as a percent)	2.83%
Effective rate (as a percent)	3.21%
1333 Broadway | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 160,000,000	160,000,000
Stated rate (as a percent)	4.21%
Effective rate (as a percent)	4.29%
345 East 94th Street - Series A | Revolving Credit Facility | SOFR
Debt Instrument [Line Items]
Variable rate, effective percentage (as a percent)	70%
Basis spread on variable rate (as a percent)	0.95%
345 East 94th Street - Series A | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 43,600,000	43,600,000
Effective rate (as a percent)	3.56%
345 East 94th Street - Series B | Revolving Credit Facility | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.24%
345 East 94th Street - Series B | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 7,209,000	7,865,000
Effective rate (as a percent)	3.56%
561 10th Avenue - Series A | Revolving Credit Facility | SOFR
Debt Instrument [Line Items]
Variable rate, effective percentage (as a percent)	70%
Basis spread on variable rate (as a percent)	1.07%
561 10th Avenue - Series A | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 114,500,000	114,500,000
Effective rate (as a percent)	3.85%
561 10th Avenue - Series B | Revolving Credit Facility | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	2.45%
561 10th Avenue - Series B | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 15,801,000	17,415,000
Effective rate (as a percent)	3.85%
Total fixed rate mortgage debt | Fixed rate mortgage debt
Debt Instrument [Line Items]
Fixed rate debt	$ 891,998,000	900,630,000
Series A | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 100,000,000	100,000,000
Stated rate (as a percent)	3.93%
Effective rate (as a percent)	3.96%
Series B | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 125,000,000	125,000,000
Stated rate (as a percent)	4.09%
Effective rate (as a percent)	4.12%
Series C | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 125,000,000	125,000,000
Stated rate (as a percent)	4.18%
Effective rate (as a percent)	4.21%
Series D | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 115,000,000	115,000,000
Stated rate (as a percent)	4.08%
Effective rate (as a percent)	4.11%
Series E | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 160,000,000	160,000,000
Stated rate (as a percent)	4.26%
Effective rate (as a percent)	4.27%
Series F | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 175,000,000	175,000,000
Stated rate (as a percent)	4.44%
Effective rate (as a percent)	4.45%
Series G | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 100,000,000	100,000,000
Stated rate (as a percent)	3.61%
Effective rate (as a percent)	4.89%
Series H | Senior unsecured notes
Debt Instrument [Line Items]
Total	$ 75,000,000	75,000,000
Stated rate (as a percent)	3.73%
Effective rate (as a percent)	5%
Unsecured revolving credit facility | Revolving Credit Facility
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 0	0
Effective rate (as a percent)	0%
Unsecured revolving credit facility | Revolving Credit Facility | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.30%
Unsecured term loan facility | Revolving Credit Facility
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 215,000,000	215,000,000
Effective rate (as a percent)	4.22%
Unsecured term loan facility | Revolving Credit Facility | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.20%
Unsecured term loan facilities | Revolving Credit Facility
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 175,000,000	$ 175,000,000
Effective rate (as a percent)	4.51%
Unsecured term loan facilities | Revolving Credit Facility | SOFR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.50%

Debt - Schedule of Aggregate Re

Debt - Schedule of Aggregate Required Principal Payments (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Amortization
2024	$ 8,861
2025	6,893
2026	7,330
2027	6,461
2028	3,556
Thereafter	18,523
Total principal maturities	51,624
Maturities
2024	77,675
2025	315,000
2026	225,000
2027	319,000
2028	146,092
Thereafter	1,122,607
Total principal maturities	2,205,374
Total
2024	86,536
2025	321,893
2026	232,330
2027	325,461
2028	149,648
Thereafter	1,141,130
Total principal maturities	$ 2,256,998

Debt - Schedule of Deferred Fin

Debt - Schedule of Deferred Financing Costs, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
Financing costs	$ 43,473	$ 43,473
Less: accumulated amortization	(31,108)	(26,753)
Total deferred financing costs, net	12,365	16,720
Amortization expense related to deferred financing costs	$ 4,400	$ 4,900	$ 4,500

Debt - Unsecured Revolving Cred

Debt - Unsecured Revolving Credit and Term Loan Facilities (Narrative) (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022	Aug. 29, 2022
Debt Instrument [Line Items]
Outstanding borrowings	$ 0	$ 0
Unsecured term loan facility | Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	1,065,000,000
Unsecured term loan facility | Credit Facility - Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	850,000,000
Outstanding borrowings	0
Unsecured term loan facility | Unsecured term loan facility
Debt Instrument [Line Items]
Maximum borrowing capacity	215,000,000
Outstanding borrowings	215,000,000	215,000,000
Unsecured term loan facility | Unsecured term loan facilities
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 175,000,000
Outstanding borrowings	$ 175,000,000	$ 175,000,000
Accordion feature, new maximum borrowing capacity			$ 225,000,000

Accounts Payable and Accrued _3

Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Accrued capital expenditures	$ 51,815	$ 44,293
Accounts payable and accrued expenses	44,169	32,927
Interest rate swap agreements liability	85	0
Accrued interest payable	3,687	3,509
Total accounts payable and accrued expenses	$ 99,756	$ 80,729

Financial Instruments and Fai_3

Financial Instruments and Fair Values - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Interest rate swap agreements liability	$ 85	$ 0
Termination value	100
Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Loss expected to be reclassified within twelve months	5,600
Interest Rate Swap and Interest Rate Cap
Derivative [Line Items]
Interest rate swap agreements liability	100
Interest Rate Swap and Interest Rate Cap | Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Interest rate swap agreements liability	100	17,900
Aggregate notional value	573,200	574,800
Interest rate swaps included in prepaid expenses and other assets	11,800
Net unrealized gains (losses) on valuation of interest rate swap agreements	$ (2,200)	$ 47,300

Financial Instruments and Fai_4

Financial Instruments and Fair Values - Schedule of the Terms of Agreements and Fair Values of Derivative Financial Instruments (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Asset	$ 11,800,000	$ 17,936,000
Liability	(85,000)	0
SOFR | Interest Rate Swap, 70% of 1 Month SOFR, 2.5000%, Swap-1
Derivatives, Fair Value [Line Items]
Notional Amount	$ 36,820,000
Receive Rate (as a percent)	70%
Pay rate (as a percent)	2.50%
Asset	$ 64,000	256,000
Liability	0	0
SOFR | Interest Rate Swap, 70% of 1 Month SOFR, 2.5000%, Swap-2
Derivatives, Fair Value [Line Items]
Notional Amount	$ 103,790,000
Receive Rate (as a percent)	70%
Pay rate (as a percent)	2.50%
Asset	$ 0	365,000
Liability	(85,000)	0
SOFR | Interest Rate Swap, 70% of 1 Month SOFR, 1.7570%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 10,710,000
Receive Rate (as a percent)	70%
Pay rate (as a percent)	1.757%
Asset	$ 546,000	643,000
Liability	0	0
SOFR | Interest Rate Swap, One Month SOFR, 2.2540%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 15,942,000
Pay rate (as a percent)	2.254%
Asset	$ 782,000	1,070,000
Liability	0	0
SOFR | Interest Rate Cap, 70% of 1 Month SOFR, 4.5000%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 6,780,000
Receive Rate (as a percent)	70%
Pay rate (as a percent)	4.50%
Asset	$ 0	8,000
Liability	0	0
SOFR | Interest Rate Cap, One Month SOFR, 5.5000%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 9,188,000
Pay rate (as a percent)	5.50%
Asset	$ 4,000	26,000
Liability	0	0
SOFR | Interest Rate Swap, SOFR Compound, 2.5620%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 175,000,000
Pay rate (as a percent)	2.562%
Asset	$ 5,637,000	8,040,000
Liability	0	0
SOFR | Interest Rate Swap, SOFR Compound, 2.6260%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 107,500,000
Pay rate (as a percent)	2.626%
Asset	$ 2,384,000	3,766,000
Liability	0	0
SOFR | Interest Rate Swap, SOFR Compound, 2.6280%
Derivatives, Fair Value [Line Items]
Notional Amount	$ 107,500,000
Pay rate (as a percent)	2.628%
Asset	$ 2,383,000	3,762,000
Liability	$ 0	$ 0

Financial Instruments and Fai_5

Financial Instruments and Fair Values - Schedule of Effect of Derivative Financial Instruments Designated as Cash Flow Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain recognized in other comprehensive income (loss)	$ 5,581	$ 40,044	$ 348
Amount of loss (gain) reclassified from accumulated other comprehensive income (loss) into interest expense	7,819	(7,230)	(11,653)
Interest expense	(101,484)	(101,206)	(94,394)
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain recognized in other comprehensive income (loss)	5,581	40,044	348
Amount of loss (gain) reclassified from accumulated other comprehensive income (loss) into interest expense	7,819	(7,230)	(11,653)
Interest rate swaps | Reclassification out of Accumulated Other Comprehensive Income | Accumulated other comprehensive income (loss)
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ 7,819	$ (7,230)	$ (11,653)

Financial Instruments and Fai_6

Financial Instruments and Fair Values - Schedule of Carrying and Estimated Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in accounts payable and accrued expenses	$ 85	$ 0
Carrying Value | Unsecured term loan facilities | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	389,286	388,773
Carrying Value | Mortgage notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	877,388	883,705
Carrying Value | Senior notes | Senior unsecured notes - Series A, B, C, D, E, F, G and H
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	973,872	973,659
Carrying Value | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	11,800	17,936
Interest rate swaps included in accounts payable and accrued expenses	85
Estimated Fair Value | Unsecured term loan facilities | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	390,000	390,000
Estimated Fair Value | Mortgage notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	774,280	783,648
Estimated Fair Value | Senior notes | Senior unsecured notes - Series A, B, C, D, E, F, G and H
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	882,242	865,292
Estimated Fair Value | Level 1 | Unsecured term loan facilities | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Estimated Fair Value | Level 1 | Mortgage notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Estimated Fair Value | Level 1 | Senior notes | Senior unsecured notes - Series A, B, C, D, E, F, G and H
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Estimated Fair Value | Level 2 | Unsecured term loan facilities | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Estimated Fair Value | Level 2 | Mortgage notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Estimated Fair Value | Level 2 | Senior notes | Senior unsecured notes - Series A, B, C, D, E, F, G and H
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	0	0
Estimated Fair Value | Level 3 | Unsecured term loan facilities | Revolving Credit Facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	390,000	390,000
Estimated Fair Value | Level 3 | Mortgage notes payable
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	774,280	783,648
Estimated Fair Value | Level 3 | Senior notes | Senior unsecured notes - Series A, B, C, D, E, F, G and H
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, fair value	882,242	865,292
Estimated Fair Value | Interest rate swaps
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	11,800	17,936
Interest rate swaps included in accounts payable and accrued expenses	85
Estimated Fair Value | Interest rate swaps | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	0	0
Interest rate swaps included in accounts payable and accrued expenses	0
Estimated Fair Value | Interest rate swaps | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	11,800	17,936
Interest rate swaps included in accounts payable and accrued expenses	85
Estimated Fair Value | Interest rate swaps | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps included in prepaid expenses and other assets	0	$ 0
Interest rate swaps included in accounts payable and accrued expenses	$ 0

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands	Dec. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($)
Operating Leases [Line Items]
Number of properties subject to ground leases | property	3
Operating lease, right-of-use assets	$ 28,439	$ 28,670
Lease liabilities	$ 28,439	$ 28,670
Weighted average discount rate (as a percent)	4.50%
Weighted average remaining lease term (in years)	46 years 6 months
Minimum
Operating Leases [Line Items]
Term of lease (in years)	1 year
Maximum
Operating Leases [Line Items]
Term of lease (in years)	22 years

Leases - Components of Rental R

Leases - Components of Rental Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Fixed payments	$ 529,965	$ 531,740	$ 500,847
Variable payments	67,354	59,308	58,843
Total rental revenue	$ 597,319	$ 591,048	$ 559,690

Leases - Future Contractual Min

Leases - Future Contractual Minimum Lease Payments On Non-Cancellable Operating Leases To Be Received, Current Year (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Leases [Abstract]
2024	$ 513,589
2025	499,154
2026	453,645
2027	434,447
2028	395,858
Thereafter	1,646,769
Total future minimum lease payments on non-cancellable operating leases to be received	$ 3,943,462

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments on Ground Leases, Current Year (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
2024	$ 1,518
2025	1,518
2026	1,503
2027	1,482
2028	1,482
Thereafter	60,795
Total undiscounted lease payments	68,298
Present value discount	(39,859)
Ground lease liabilities	$ 28,439	$ 28,670

Commitments and Contingencies -

Commitments and Contingencies - Litigation (Narrative) (Details) - New York State Supreme Court, New York County $ in Thousands			1 Months Ended
	Jan. 22, 2024 USD ($)	Aug. 26, 2020 USD ($)	Oct. 31, 2014 participant
Loss Contingencies [Line Items]
Number of plaintiffs opting out of settlement (participant) | participant			12
Amount awarded to claimants		$ 1,200
Interest period (in years)		7 years
Subsequent Event
Loss Contingencies [Line Items]
Amount awarded to claimants	$ 1,260

Commitments and Contingencies_2

Commitments and Contingencies - Unfunded Capital Expenditures (Narrative) (Details) $ in Millions	Dec. 31, 2023 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Unfunded capital expenditures	$ 101.2

Commitments and Contingencies_3

Commitments and Contingencies - Major Customers and Other Concentrations (Narrative) (Details) - Customer concentration risk - Rental revenue - property	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Concentration Risk [Line Items]
Number of properties	3	3	3
Tenant 1
Concentration Risk [Line Items]
Concentration risk percentage (as a percent)	6.80%	6.40%	4.60%
Tenant 2
Concentration Risk [Line Items]
Concentration risk percentage (as a percent)	2.50%	2%	3.30%
Tenant 3
Concentration Risk [Line Items]
Concentration risk percentage (as a percent)	2.10%		2.80%
Tenant 4
Concentration Risk [Line Items]
Concentration risk percentage (as a percent)	2.10%		2.10%

Commitments and Contingencies_4

Commitments and Contingencies - Schedule of Percent of Total Rental Revenue (Details) - Rental revenue - Customer concentration risk	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Empire State Building
Concentration Risk [Line Items]
Concentration risk percentage (as a percent)	29.60%	29.90%	31.70%
One Grand Central Place
Concentration Risk [Line Items]
Concentration risk percentage (as a percent)	12.80%	12.40%	12.60%
111 West 33rd Street
Concentration Risk [Line Items]
Concentration risk percentage (as a percent)	10.80%	11.20%	11.30%

Commitments and Contingencies_5

Commitments and Contingencies - 32BJ ("Union") Pension Plan and Health Plan (Narrative) (Details) - Building Service 32BJ - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Pension Plans
Multiemployer Plans [Line Items]
Plan contributions	$ 317.9	$ 305.7	$ 290.1
Health Plans
Multiemployer Plans [Line Items]
Plan contributions	$ 1,900	$ 1,600	$ 1,500

Commitments and Contingencies_6

Commitments and Contingencies - Schedule of Contributions to Multiemployer Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Multiemployer Plans [Line Items]
Contributions	$ 12,917	$ 12,036	$ 8,684
Pension Plans
Multiemployer Plans [Line Items]
Contributions	3,671	2,958	2,165
Contributions, insignificant	800	800	700
Health Plans
Multiemployer Plans [Line Items]
Contributions	8,812	8,618	6,214
Contributions, insignificant	1,600	1,500	1,400
Other
Multiemployer Plans [Line Items]
Contributions	434	460	305
Contributions, insignificant	$ 300	$ 200	$ 200

Capital - Shares and Units (Nar

Capital - Shares and Units (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023 vote class shares
Other partners, certain directors, officers and other members of executive management
Shares and Units [Abstract]
OP units not owned by the company (in shares)	107,900,200
Other partners, certain directors, officers and other members of executive management | Empire State Realty OP
Shares and Units [Abstract]
OP units not owned by the company (as a percent)	39.80%
Empire State Realty Trust
Shares and Units [Abstract]
Number of classes of stock | class	2
Exchange ratio	0.020
Number of voting rights | vote	50
Empire State Realty Trust | Empire State Realty OP
Shares and Units [Abstract]
OP units owned by the company (as a percent)	60.20%
Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock outstanding (in shares)	162,061,947
Common Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock outstanding (in shares)	984,317

Capital - Schedule of Purchases

Capital - Schedule of Purchases of Equity Securities (Details) - USD ($)		12 Months Ended
	Feb. 27, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total Number of Shares Purchased (in shares)		2,150,857
Average Price Paid Per Share (in dollars per share)		$ 6.09
Maximum Approximate Dollar Value Available for Future Purchases		$ 500,000,000
January 2022 Through December 2023 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authorized amount		500,000,000
Remaining of authorized repurchase amount		103,300,000
January 2024 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase authorized amount		$ 500,000,000
January 2024 Plan | Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining of authorized repurchase amount	$ 0

Capital - Private Perpetual Pre

Capital - Private Perpetual Preferred Units (Narrative) (Details) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Partners' Capital [Line Items]
Private perpetual preferred units, issued (in shares)	4,664,000
Private Perpetual Preferred Units, Series 2019
Partners' Capital [Line Items]
Private perpetual preferred units, issued (in shares)	4,664,038	4,664,000
Private perpetual preferred units, liquidation preference per share (in dollars per share)	$ 13.52	$ 13.52
Cumulative cash distributions (in dollars per share)	$ 0.70
Private Perpetual Preferred Units, Series 2014
Partners' Capital [Line Items]
Private perpetual preferred units, issued (in shares)	1,560,000	1,560,000
Private perpetual preferred units (in shares)	1,560,360
Private perpetual preferred units, liquidation preference per share (in dollars per share)	$ 16.62	$ 16.62
Dividend declared (in dollars per share)	$ 0.60

Capital - Schedule of Distribut

Capital - Schedule of Distributions Paid on Operating Partnership Units (Details) - USD ($) $ / shares in Units, $ in Millions												12 Months Ended
	Dec. 29, 2023	Sep. 29, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Equity [Abstract]
Dividends declared and paid on operating partnership units (in dollars per share)	$ 0.035	$ 0.035	$ 0.035	$ 0.035	$ 0.035	$ 0.035	$ 0.035	$ 0.035	$ 0.035	$ 0.035	$ 0.035
Distributions paid to OP unit holders												$ 41.3	$ 42.8	$ 32.8

Capital - Incentive and Share-B

Capital - Incentive and Share-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands		1 Months Ended		12 Months Ended
	May 31, 2023 USD ($) shares	Jul. 31, 2023 USD ($) director shares	Mar. 31, 2023 USD ($) vesting_installment shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares	Dec. 31, 2021 USD ($) $ / shares	May 16, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
LTIP unit, share of stock equivalent (in shares)				1
Conversion rate tor LTIP units to OP units				1
Dividends on common stock received until performance criteria met for LTIP units (as a percent)				10%
Dividends on common stock received after performance criteria met for LTIP units (as a percent)				90%
Dividends on common stock received in periods after performance criteria met for LTIP units (as a percent)				100%
Granted (in dollars per share) | $ / shares				$ 5.67
Awards that Meet Age and Service Requirements for Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncash share-based compensation expense recognized | $				$ 2,800	$ 2,300	$ 1,300
Unrecognized compensation expense | $				$ 3,200
Unrecognized compensation expense, period for recognition (in years)				2 years 4 months 24 days
Awards that Do Not Meet Age and Service Requirements for Vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncash share-based compensation expense recognized | $				$ 17,200	18,700	19,000
Unrecognized compensation expense | $				$ 24,100
Unrecognized compensation expense, period for recognition (in years)				2 years 4 months 24 days
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Age of grantee at which LTIP unit and restricted stock awards immediately vest (in years)				60 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Age of grantee at which LTIP unit and restricted stock awards immediately vest (in years)				65 years
Long-Term Incentive Plan Units and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of share-based awards granted in period | $				$ 21,700	$ 22,400	$ 20,000
Granted (in dollars per share) | $ / shares				$ 5.67	$ 7.21	$ 8.52
Dividend rate (as a percent)				1.70%	2%	2.60%
Risk free interest rate, minimum (as a percent)				4.40%	1.40%	0.12%
Risk free interest rate, maximum (as a percent)				5%	2%	0.32%
Expected price volatility, minimum (as a percent)				35%	37%	36%
Expected price volatility, maximum (as a percent)				46%	53%	53%
Fair value vested in period | $				$ 13,300	$ 14,100	$ 12,300
Long-Term Incentive Plan Units and Restricted Stock | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)				2 years	2 years	2 years
Long-Term Incentive Plan Units and Restricted Stock | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)				5 years 3 months 18 days	5 years 3 months 18 days	5 years 3 months 18 days
Time-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				1,733,015
Time-based LTIPs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Time-based LTIPs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				5 years
Time-based LTIPs | Median
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				4 years
Market-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				946,398
Market-based LTIPs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Market-based LTIPs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				4 years
Performance-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)				771,180
March 2023 Awards | Time-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			229,308
Fair value of share-based awards granted in period | $			$ 1,500
Award vesting period (in years)			4 years
March 2023 Awards | Market-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			111,942
Fair value of share-based awards granted in period | $			$ 600
Performance period (in years)			3 years
Number of vesting installments | vesting_installment			2
March 2023 Awards | Performance-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			91,211
Fair value of share-based awards granted in period | $			$ 600
Performance period (in years)			1 year
TSR modifier period (in years)			3 years
March 2023 Awards | Time Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			370,465
Fair value of share-based awards granted in period | $			$ 2,600
Granted In 2020 And After
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retirement age (in years)				65 years
Granted Before 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retirement age (in years)				60 years
Executive Officer | Time-based LTIPs | 2019 Plan Units, Connected With Bonus Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			521,571
Fair value of share-based awards granted in period | $			$ 3,000
Executive Officer | Time-based LTIPs | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			446,376
Award vesting period (in years)			3 years
Executive Officer | Time-based LTIPs | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of vesting installments | vesting_installment			2
Executive Officer | March 2023 Awards | Time-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			552,412
Fair value of share-based awards granted in period | $			$ 3,200
Executive Officer | March 2023 Awards | Market-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			834,456
Fair value of share-based awards granted in period | $			$ 3,900
Executive Officer | March 2023 Awards | Performance-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			679,969
Fair value of share-based awards granted in period | $			$ 3,900
Executive Officer | Awards Granted In 2023 | Time-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Executive Officer | Awards Granted In 2021, 2022 and 2023 | Time-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage of award face amount (as a percent)				120%
Executive Officer | Awards Granted In 2021 | Time-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage of award face amount (as a percent)				125%
Certain Other Employees | March 2023 Awards | Time-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			152,542
Fair value of share-based awards granted in period | $			$ 1,000
Certain Other Employees | March 2023 Awards | Time-based LTIPs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)			4 years
Certain Other Employees | March 2023 Awards | Time-based LTIPs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)			5 years
Retired General Counsel | March 2023 Awards | Time-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			75,195
Director | Time-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of directors granted | director		2
Director | Time-based LTIPs | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		27,000
Vesting rights (as a percent)		25%
Fair value of share-based awards granted in period | $		$ 200
Director | Time-based LTIPs | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan (in shares)							11,000,000
Number of shares that remain available for future issuance (in shares)				4,200,000
2019 Plan | Director | Time-based LTIPs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	237,856
Award vesting percentage of award face amount (as a percent)	120%
Annual base retainer | $	$ 200
Fair value of share-based awards granted in period | $	$ 1,200
2019 Plan | Director | Time-based LTIPs | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	4 years
Vesting rights (as a percent)	60%
2019 Plan | Director | Time-based LTIPs | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
Vesting rights (as a percent)	40%
2019 Plan | Director | Time-based LTIPs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	3 years
2019 Plan | Director | Time-based LTIPs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)	4 years

Capital - Schedule of ESRT Rest

Capital - Schedule of ESRT Restricted Stock and LTIP Unit Activity (Details)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Weighted Average Grant Fair Value
Unvested, beginning balance (in dollars per share) | $ / shares	$ 6.69
Vested (in dollars per share) | $ / shares	7.17
Granted (in dollars per share) | $ / shares	5.67
Forfeited or unearned (in dollars per share) | $ / shares	4.30
Unvested, ending balance (in dollars per share) | $ / shares	$ 6.60
ESRT Restricted Stock
Restricted Stock and LTIP Units
Unvested, beginning balance (in shares)	359,293
Vested (in shares)	(121,128)
Granted (in shares)	370,465
Forfeited or unearned (in shares)	(10,341)
Unvested, ending balance (in shares)	598,289
Time-based LTIPs
Restricted Stock and LTIP Units
Unvested, beginning balance (in shares)	2,713,522
Vested (in shares)	(1,148,987)
Granted (in shares)	1,733,015
Forfeited or unearned (in shares)	0
Unvested, ending balance (in shares)	3,297,550
Market-based LTIPs
Restricted Stock and LTIP Units
Unvested, beginning balance (in shares)	4,070,537
Vested (in shares)	(582,800)
Granted (in shares)	946,398
Forfeited or unearned (in shares)	(1,695,323)
Unvested, ending balance (in shares)	2,738,812
Performance-based LTIPs
Restricted Stock and LTIP Units
Unvested, beginning balance (in shares)	510,989
Vested (in shares)	(2,011)
Granted (in shares)	771,180
Forfeited or unearned (in shares)	(3,795)
Unvested, ending balance (in shares)	1,276,363

Capital - Schedule of Earnings

Capital - Schedule of Earnings Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net income (loss)	$ 84,407	$ 63,212	$ (13,037)
Private perpetual preferred unit distributions	(4,201)	(4,201)	(4,201)
Net (income) loss attributable to non-controlling interests in other partnerships	(68)	243	0
Earnings allocated to unvested shares - basic	0	0	(340)
Earnings allocated to unvested shares - diluted	0	0	(340)
Net income (loss) attributable to common unitholders - basic	80,138	59,254	(17,578)
Net income (loss) attributable to common unitholders - diluted	$ 80,138	$ 59,254	$ (17,578)
Denominator:
Weighted average units outstanding - basic (in shares)	263,226,000	268,337,000	277,420,000
Effect of dilutive securities:
Stock-based compensation plans (in shares)	2,407,000	1,611,000	0
Weighted average shares outstanding - diluted (in shares)	265,633,000	269,948,000	277,420,000
Earnings per unit
Earnings per unit - basic (in dollars per share)	$ 0.30	$ 0.22	$ (0.06)
Earnings per unit - diluted (in dollars per share)	$ 0.30	$ 0.22	$ (0.06)
Antidilutive securities (in shares)	0	0	1,052,390

Related Party Transactions - Sa

Related Party Transactions - Sale of Westport Retail Properties (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Feb. 01, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Received during marketed sale process	$ 0		$ 35,538
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 69-97 and 103-107 Main Street, Westport, Connecticut
Related Party Transaction [Line Items]
Consideration from sale of property		$ 40,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 69-97 and 103-107 Main Street, Westport, Connecticut | Affiliated Entity
Related Party Transaction [Line Items]
Consideration from sale of property		40,000
Received during marketed sale process		40,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | 69-97 and 103-107 Main Street, Westport, Connecticut | Affiliated Entity | SOFR
Related Party Transaction [Line Items]
Maximum principal amount		$ 1,000
Basis spread on loan		3.50%

Related Party Transactions - Ta

Related Party Transactions - Tax Protection Agreements (Details) $ in Millions		12 Months Ended
	Oct. 07, 2013 USD ($)	Dec. 31, 2013 property	Aug. 23, 2016
Q REIT Holding LLC
Related Party Transaction [Line Items]
Threshold to indemnify (as a percent)			10%
Affiliated Entity
Related Party Transaction [Line Items]
Number of properties protected | property		4
Aggregate number of operating partnership units and common stock threshold during tax protection period (as a percent)	50%
Bottom dollar guarantee of aggregate indebtedness during tax protection period | $	$ 160

Related Party Transactions - Re

Related Party Transactions - Registration Rights (Details) - Registration rights agreement	12 Months Ended
	Dec. 31, 2023 USD ($) underwritten_offering
Related Party Transaction [Line Items]
Number of underwritten offerings, maximum, during 12-month period following shelf effective date | underwritten_offering	2
Primary shares cutback value, minimum	$ 25,000,000
Payments for fees and registration per underwritten offering, maximum (up to)	25,000
Certain persons receiving common stock or operating partnership units in formation transactions
Related Party Transaction [Line Items]
Registrable shares market value, minimum	$ 150,000,000
Number of underwritten offerings, maximum | underwritten_offering	4

Related Party Transactions - Ex

Related Party Transactions - Excluded Properties and Businesses (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) office_property interest property	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items]
Revenues | $	$ 739,572	$ 727,041	$ 624,094
Office Building
Related Party Transaction [Line Items]
Number of properties | office_property	11
Office Building | Manhattan
Related Party Transaction [Line Items]
Number of properties | office_property	9
Malkin Group | Mezzanine and Senior Equity Funds
Related Party Transaction [Line Items]
Number of interests owned | interest	1
Malkin Group | Residential Property Manager
Related Party Transaction [Line Items]
Number of properties	3
Number of interests owned | interest	3
Malkin Group | Multi-family Property | Greenwich, Connecticut
Related Party Transaction [Line Items]
Number of properties	7
Malkin Group | Retail Site | Greenwich, Connecticut
Related Party Transaction [Line Items]
Number of properties	5
Malkin Group | Retail Site | Manhattan
Related Party Transaction [Line Items]
Number of properties	2
Malkin Group | Retail Site | Westport, Connecticut | Disposal Group, Disposed of by Sale, Not Discontinued Operations | 69-97 and 103-107 Main Street, Westport, Connecticut
Related Party Transaction [Line Items]
Number of properties	2
Malkin Group | Former Post Office | Greenwich, Connecticut
Related Party Transaction [Line Items]
Number of properties	1
Malkin Group | Office Building | Manhattan
Related Party Transaction [Line Items]
Number of properties	1
Affiliated Entity | Supervisory fee revenue
Related Party Transaction [Line Items]
Revenues | $	$ 900	1,000	1,000
Affiliated Entity | Property management fee revenue
Related Party Transaction [Line Items]
Revenues | $	$ 300	$ 300	$ 200

Related Party Transactions - Ot

Related Party Transactions - Other (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) ft² property	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Related Party Transaction [Line Items]
Revenues	$ 739,572	$ 727,041	$ 624,094
Undivided Interest
Related Party Transaction [Line Items]
Area of real estate property (in square feet) | ft²	5,447
Affiliated Entity | Leased space rental
Related Party Transaction [Line Items]
Number of properties | property	1
Lease cancellation, period of notice (in days)	90 days
Revenues	$ 200	$ 300	$ 300
Chairman emeritus | Leased space rental
Related Party Transaction [Line Items]
Percentage of lease space occupied by Chairman emeritus and employee (as a percent)	15%

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ (783)	$ (319)	$ (266)
State and local	(695)	(227)	(347)
Total current	(1,478)	(546)	(613)
Deferred:
Federal	(710)	(264)	1,206
State and local	(527)	(736)	1,141
Total deferred	(1,237)	(1,000)	2,347
Income tax (expense) benefit	$ (2,715)	$ (1,546)	$ 1,734

Income Taxes - Narrative (Detai

Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Effective income tax rate (as a percent)	44.50%	33.60%	26%
Valuation allowance	$ 0	$ 0	$ 0
Unrecognized tax benefits	0	$ 0	$ 0
Empire State Realty Trust
Operating Loss Carryforwards [Line Items]
NOL carryforwards	103,000,000
Observatory | Operating Segments
Operating Loss Carryforwards [Line Items]
NOL carryforwards	1,500,000
Income tax receivable	$ 2,500,000

Income Taxes - Schedule of Actu

Income Taxes - Schedule of Actual Tax Provision Differed From Federal Statutory Corporate Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Federal tax benefit (expense) at statutory rate	$ (1,494)	$ (583)	$ 940
State income tax benefit (expense), net of federal benefit	(1,221)	(963)	794
Income tax (expense) benefit	$ (2,715)	$ (1,546)	$ 1,734

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Deferred revenue on unredeemed Observatory admission ticket sales	$ 616	$ 535	$ 383
Federal net operating loss carryforward credit	328	969	1,393
New York State net operating loss carryforward credit	0	250	612
New York City net operating loss carryforward credit	0	233	704
Other deferred tax assets	161	261	0
Deferred tax assets	$ 1,105	$ 2,248	$ 3,092

Segment Reporting - Narrative (

Segment Reporting - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment		2
Impairment charges		$ 0	$ 0	$ 7,723
Real Estate
Segment Reporting Information [Line Items]
Impairment charges	$ 7,700

Segment Reporting - Segment Rev

Segment Reporting - Segment Revenue and Profit or Loss Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues:
Rental revenue		$ 597,319	$ 591,048	$ 559,690
Intercompany rental revenue		0	0	0
Observatory revenue		129,366	105,978	41,474
Lease termination fees		0	20,032	16,230
Third-party management and other fees		1,351	1,361	1,219
Other revenue and fees		11,536	8,622	5,481
Total revenues		739,572	727,041	624,094
Operating expenses:
Property operating expenses		167,324	157,935	126,986
Intercompany rent expense		0	0	0
Ground rent expenses		9,326	9,326	9,326
General and administrative expenses		63,939	61,765	55,947
Observatory expenses		35,265	31,036	23,206
Real estate taxes		127,101	123,057	119,967
Impairment charges		0	0	7,723
Depreciation and amortization		189,911	216,894	201,806
Total operating expenses		592,866	600,013	544,961
Total operating income		146,706	127,028	79,133
Other income (expense):
Interest income		15,136	4,948	704
Interest expense		(101,484)	(101,206)	(94,394)
Gain on sale/disposition of properties		26,764	33,988	0
Loss on early extinguishment of debt		0	0	(214)
Income (loss) before income taxes		87,122	64,758	(14,771)
Income tax (expense) benefit		(2,715)	(1,546)	1,734
Net income (loss)		84,407	63,212	(13,037)
Segment assets	$ 4,282,447	4,219,333	4,163,594	4,282,447
Expenditures for segment assets		169,155	85,961	398,372
Intersegment Elimination
Revenues:
Rental revenue		0	0	0
Intercompany rental revenue		(80,514)	(65,005)	(23,413)
Observatory revenue		0	0	0
Lease termination fees		0	0	0
Third-party management and other fees		0	0	0
Other revenue and fees		0	0	0
Total revenues		(80,514)	(65,005)	(23,413)
Operating expenses:
Property operating expenses		0	0	0
Intercompany rent expense		(80,514)	(65,005)	(23,413)
Ground rent expenses		0	0	0
General and administrative expenses		0	0	0
Observatory expenses		0	0	0
Real estate taxes		0	0	0
Impairment charges			0	0
Depreciation and amortization		0	0	0
Total operating expenses		(80,514)	(65,005)	(23,413)
Total operating income		0	0	0
Other income (expense):
Interest income		0	0	0
Interest expense		0	0	0
Gain on sale/disposition of properties		0	0
Loss on early extinguishment of debt				0
Income (loss) before income taxes		0	0	0
Income tax (expense) benefit		0	0	0
Net income (loss)		0	0	0
Segment assets	0	0	0	0
Expenditures for segment assets		0	0	0
Real Estate
Operating expenses:
Impairment charges	7,700
Real Estate | Operating Segments
Revenues:
Rental revenue		597,319	591,048	559,690
Intercompany rental revenue		80,514	65,005	23,413
Observatory revenue		0	0	0
Lease termination fees		0	20,032	16,230
Third-party management and other fees		1,351	1,361	1,219
Other revenue and fees		11,536	8,622	5,343
Total revenues		690,720	686,068	605,895
Operating expenses:
Property operating expenses		167,324	157,935	126,986
Intercompany rent expense		0	0	0
Ground rent expenses		9,326	9,326	9,326
General and administrative expenses		63,939	61,765	55,947
Observatory expenses		0	0	0
Real estate taxes		127,101	123,057	119,967
Impairment charges			0	7,723
Depreciation and amortization		189,762	216,707	201,676
Total operating expenses		557,452	568,790	521,625
Total operating income		133,268	117,278	84,270
Other income (expense):
Interest income		14,936	4,901	701
Interest expense		(101,484)	(101,206)	(94,292)
Gain on sale/disposition of properties		26,764	33,988
Loss on early extinguishment of debt				(214)
Income (loss) before income taxes		73,484	54,961	(9,535)
Income tax (expense) benefit		(552)	(584)	(613)
Net income (loss)		72,932	54,377	(10,148)
Segment assets	4,037,122	3,957,659	3,909,299	4,037,122
Expenditures for segment assets		169,044	85,646	398,368
Observatory | Operating Segments
Revenues:
Rental revenue		0	0	0
Intercompany rental revenue		0	0	0
Observatory revenue		129,366	105,978	41,474
Lease termination fees		0	0	0
Third-party management and other fees		0	0	0
Other revenue and fees		0	0	138
Total revenues		129,366	105,978	41,612
Operating expenses:
Property operating expenses		0	0	0
Intercompany rent expense		80,514	65,005	23,413
Ground rent expenses		0	0	0
General and administrative expenses		0	0	0
Observatory expenses		35,265	31,036	23,206
Real estate taxes		0	0	0
Impairment charges			0	0
Depreciation and amortization		149	187	130
Total operating expenses		115,928	96,228	46,749
Total operating income		13,438	9,750	(5,137)
Other income (expense):
Interest income		200	47	3
Interest expense		0	0	(102)
Gain on sale/disposition of properties		0	0
Loss on early extinguishment of debt				0
Income (loss) before income taxes		13,638	9,797	(5,236)
Income tax (expense) benefit		(2,163)	(962)	2,347
Net income (loss)		11,475	8,835	(2,889)
Segment assets	$ 245,325	261,674	254,295	245,325
Expenditures for segment assets		$ 111	$ 315	$ 4

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Details) $ in Thousands	Dec. 31, 2023 USD ($)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 879,195
Initial Cost to the Company
Land and Development Costs	364,266
Building & Improvements	1,095,880
Cost Capitalized Subsequent to Acquisition
Improvements	2,195,046
Gross Amount at which Carried
Land and Development Costs	374,535
Buildings & Improvements	3,280,657
Total	3,655,192
Accumulated Depreciation	(1,250,062)
111 West 33rd Street, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	13,630
Building & Improvements	244,461
Cost Capitalized Subsequent to Acquisition
Improvements	129,859
Gross Amount at which Carried
Land and Development Costs	13,630
Buildings & Improvements	374,320
Total	387,950
Accumulated Depreciation	(118,371)
1400 Broadway, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	0
Building & Improvements	96,338
Cost Capitalized Subsequent to Acquisition
Improvements	102,241
Gross Amount at which Carried
Land and Development Costs	0
Buildings & Improvements	198,579
Total	198,579
Accumulated Depreciation	(72,907)
1333 Broadway, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	159,039
Initial Cost to the Company
Land and Development Costs	91,434
Building & Improvements	120,190
Cost Capitalized Subsequent to Acquisition
Improvements	17,239
Gross Amount at which Carried
Land and Development Costs	91,435
Buildings & Improvements	137,429
Total	228,864
Accumulated Depreciation	(43,811)
1350 Broadway, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	0
Building & Improvements	102,518
Cost Capitalized Subsequent to Acquisition
Improvements	48,815
Gross Amount at which Carried
Land and Development Costs	0
Buildings & Improvements	151,333
Total	151,333
Accumulated Depreciation	(55,169)
250 West 57th Street, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	175,755
Initial Cost to the Company
Land and Development Costs	2,117
Building & Improvements	5,041
Cost Capitalized Subsequent to Acquisition
Improvements	179,876
Gross Amount at which Carried
Land and Development Costs	2,117
Buildings & Improvements	184,917
Total	187,034
Accumulated Depreciation	(74,936)
501 Seventh Avenue, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	1,100
Building & Improvements	2,600
Cost Capitalized Subsequent to Acquisition
Improvements	107,812
Gross Amount at which Carried
Land and Development Costs	1,100
Buildings & Improvements	110,412
Total	111,512
Accumulated Depreciation	(58,775)
1359 Broadway, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	1,233
Building & Improvements	1,809
Cost Capitalized Subsequent to Acquisition
Improvements	83,221
Gross Amount at which Carried
Land and Development Costs	1,233
Buildings & Improvements	85,029
Total	86,262
Accumulated Depreciation	(33,438)
350 Fifth Avenue (Empire State Building), New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	21,551
Building & Improvements	38,934
Cost Capitalized Subsequent to Acquisition
Improvements	1,060,121
Gross Amount at which Carried
Land and Development Costs	21,551
Buildings & Improvements	1,099,055
Total	1,120,606
Accumulated Depreciation	(428,926)
One Grand Central Place, New York, NY | office/ retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	7,240
Building & Improvements	17,490
Cost Capitalized Subsequent to Acquisition
Improvements	310,522
Gross Amount at which Carried
Land and Development Costs	7,222
Buildings & Improvements	328,030
Total	335,252
Accumulated Depreciation	(164,248)
First Stamford Place, Stamford, CT | office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	177,181
Initial Cost to the Company
Land and Development Costs	22,952
Building & Improvements	122,738
Cost Capitalized Subsequent to Acquisition
Improvements	86,494
Gross Amount at which Carried
Land and Development Costs	24,860
Buildings & Improvements	207,324
Total	232,184
Accumulated Depreciation	(113,916)
One Station Place, Stamford, CT (Metro Center) | office
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	80,117
Initial Cost to the Company
Land and Development Costs	5,313
Building & Improvements	28,602
Cost Capitalized Subsequent to Acquisition
Improvements	40,955
Gross Amount at which Carried
Land and Development Costs	5,313
Buildings & Improvements	69,557
Total	74,870
Accumulated Depreciation	(41,494)
10 Union Square, New York, NY | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	49,762
Initial Cost to the Company
Land and Development Costs	5,003
Building & Improvements	12,866
Cost Capitalized Subsequent to Acquisition
Improvements	5,742
Gross Amount at which Carried
Land and Development Costs	5,003
Buildings & Improvements	18,608
Total	23,611
Accumulated Depreciation	(10,102)
1542 Third Avenue, New York, NY | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	29,804
Initial Cost to the Company
Land and Development Costs	2,239
Building & Improvements	15,266
Cost Capitalized Subsequent to Acquisition
Improvements	485
Gross Amount at which Carried
Land and Development Costs	2,239
Buildings & Improvements	15,751
Total	17,990
Accumulated Depreciation	(9,937)
1010 Third Avenue, New York, NY and 77 West 55th Street, New York, NY | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	34,697
Initial Cost to the Company
Land and Development Costs	4,462
Building & Improvements	15,819
Cost Capitalized Subsequent to Acquisition
Improvements	4,211
Gross Amount at which Carried
Land and Development Costs	4,462
Buildings & Improvements	20,030
Total	24,492
Accumulated Depreciation	(10,937)
345 E 94th Street, New York, NY | multi-family
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	48,646
Initial Cost to the Company
Land and Development Costs	44,228
Building & Improvements	55,766
Cost Capitalized Subsequent to Acquisition
Improvements	4,237
Gross Amount at which Carried
Land and Development Costs	44,228
Buildings & Improvements	60,003
Total	104,231
Accumulated Depreciation	(3,485)
Victory 561 10th Ave, New York, NY | multi-family
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	124,194
Initial Cost to the Company
Land and Development Costs	91,437
Building & Improvements	124,997
Cost Capitalized Subsequent to Acquisition
Improvements	3,461
Gross Amount at which Carried
Land and Development Costs	91,437
Buildings & Improvements	128,458
Total	219,895
Accumulated Depreciation	(7,491)
298 Mulberry, New York, NY | multi-family
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	40,935
Building & Improvements	69,509
Cost Capitalized Subsequent to Acquisition
Improvements	1,475
Gross Amount at which Carried
Land and Development Costs	41,125
Buildings & Improvements	70,794
Total	111,919
Accumulated Depreciation	(1,923)
Williamsburg Retail, Brooklyn, NY | retail
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	4,851
Building & Improvements	20,936
Cost Capitalized Subsequent to Acquisition
Improvements	101
Gross Amount at which Carried
Land and Development Costs	4,860
Buildings & Improvements	21,028
Total	25,888
Accumulated Depreciation	(196)
Property for development at the Transportation Hub in Stamford, CT | land
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost to the Company
Land and Development Costs	4,541
Building & Improvements	0
Cost Capitalized Subsequent to Acquisition
Improvements	8,179
Gross Amount at which Carried
Land and Development Costs	12,720
Buildings & Improvements	0
Total	12,720
Accumulated Depreciation	$ 0

Schedule III - Real Estate an_3

Schedule III - Real Estate and Accumulated Depreciation - Reconciliation of Investment Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]
Balance, beginning of year	$ 3,551,449	$ 3,500,917	$ 3,133,966
Acquisition of new properties	25,787	110,444	316,428
Improvements	106,792	79,070	89,426
Property classified as held for sale	0	(61,965)	0
Disposals	(28,836)	(77,017)	(38,903)
Balance, end of year	3,655,192	$ 3,551,449	$ 3,500,917
Aggregate cost of investment properties for federal income tax purpose	$ 3,800,000

Schedule III - Real Estate an_4

Schedule III - Real Estate and Accumulated Depreciation - Reconciliation of Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance, beginning of year	$ 1,137,267	$ 1,072,938	$ 941,612
Depreciation expense	158,879	179,872	162,667
Property classified as held for sale	0	(30,315)	0
Disposals	(46,084)	(85,228)	(31,341)
Balance, end of year	$ 1,250,062	$ 1,137,267	$ 1,072,938

Schedule III - Real Estate an_5

Schedule III - Real Estate and Accumulated Depreciation - Schedule of Estimated Useful Lives of Investment Properties (Details)	Dec. 31, 2023
Buildings
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Estimated original useful lives (in years)	39 years
Building improvements
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate and Accumulated Depreciation [Line Items]
Estimated original useful lives (in years)	39 years