Revenue Recognition (Schedule of Revenues by Segment ) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Total revenues	Total revenues
Lease income	$ 375,599	$ 381,877
Total revenues	436,375	445,923
New York
Disaggregation of Revenue [Line Items]
Total revenues	358,234	363,814
Other
Disaggregation of Revenue [Line Items]
Total revenues	78,141	82,109
Rental revenues
Disaggregation of Revenue [Line Items]
Total revenues	389,278	396,793
Rental revenues | New York
Disaggregation of Revenue [Line Items]
Total revenues	311,735	319,516
Rental revenues | Other
Disaggregation of Revenue [Line Items]
Total revenues	77,543	77,277
Lease revenues
Disaggregation of Revenue [Line Items]
Lease income	375,599	381,877
Lease revenues | New York
Disaggregation of Revenue [Line Items]
Lease income	301,531	307,722
Lease revenues | Other
Disaggregation of Revenue [Line Items]
Lease income	74,068	74,155
Property rentals
Disaggregation of Revenue [Line Items]
Lease income	369,883	376,829
Property rentals | New York
Disaggregation of Revenue [Line Items]
Lease income	301,531	307,722
Property rentals | Other
Disaggregation of Revenue [Line Items]
Lease income	68,352	69,107
Trade shows
Disaggregation of Revenue [Line Items]
Lease income	5,716	5,048
Trade shows | New York
Disaggregation of Revenue [Line Items]
Lease income	0	0
Trade shows | Other
Disaggregation of Revenue [Line Items]
Lease income	5,716	5,048
Tenant services
Disaggregation of Revenue [Line Items]
Revenue	9,028	9,769
Tenant services | New York
Disaggregation of Revenue [Line Items]
Revenue	6,547	7,582
Tenant services | Other
Disaggregation of Revenue [Line Items]
Revenue	2,481	2,187
Parking revenues
Disaggregation of Revenue [Line Items]
Revenue	4,651	5,147
Parking revenues | New York
Disaggregation of Revenue [Line Items]
Revenue	3,657	4,212
Parking revenues | Other
Disaggregation of Revenue [Line Items]
Revenue	994	935
Fee and other income
Disaggregation of Revenue [Line Items]
Revenue	47,097	49,130
Total revenues	47,097	49,130
Fee and other income | New York
Disaggregation of Revenue [Line Items]
Revenue	46,499	44,298
Fee and other income | Other
Disaggregation of Revenue [Line Items]
Revenue	598	4,832
BMS cleaning fees
Disaggregation of Revenue [Line Items]
Revenue	35,780	35,328
BMS cleaning fees | New York
Disaggregation of Revenue [Line Items]
Revenue	38,640	37,678
BMS cleaning fees | Other
Disaggregation of Revenue [Line Items]
Revenue	(2,860)	(2,350)
Management and leasing fees
Disaggregation of Revenue [Line Items]
Revenue	2,611	3,049
Management and leasing fees | New York
Disaggregation of Revenue [Line Items]
Revenue	2,712	3,173
Management and leasing fees | Other
Disaggregation of Revenue [Line Items]
Revenue	(101)	(124)
Other income
Disaggregation of Revenue [Line Items]
Revenue	8,706	10,753
Other income | New York
Disaggregation of Revenue [Line Items]
Revenue	5,147	3,447
Other income | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 3,559	$ 7,306