CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows from Operating Activities:
Net (loss) income	$ (371,303,000)	$ (28,197,000)	$ 2,059,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	250,644,000	232,517,000	232,487,000
Straight-lining of rental revenue	(4,874,000)	(13,602,000)	(2,495,000)
Amortization of stock-based compensation expense	20,321,000	19,003,000	18,612,000
Amortization of deferred financing costs	6,219,000	6,156,000	9,127,000	[1]
Loss from unconsolidated joint ventures	20,126,000	21,566,000	24,896,000
Real estate impairment losses on unconsolidated joint ventures	250,172,000	31,685,000
Distributions of earnings from unconsolidated joint ventures	17,096,000	1,324,000	7,278,000
Realized and unrealized losses on real estate related fund investments	107,722,000
Loss (Income) from unconsolidated real estate related funds	822,000	1,239,000	(782,000)
Distributions of earnings from unconsolidated real estate related funds	117,000	1,318,000	676,000
Amortization of above and below-market leases, net	(5,376,000)	(1,748,000)	(3,070,000)
Loss recognized upon consolidation of real estate related fund investments that were previously unconsolidated		2,627,000
Realized and unrealized gains on marketable securities			(1,535,000)
Other non-cash adjustments	669,000	1,188,000	3,146,000
Changes in operating assets and liabilities:
Real estate related fund investments	(3,128,000)
Accounts and other receivables	5,813,000	(8,284,000)	1,920,000
Deferred charges	(12,200,000)	(15,083,000)	(18,438,000)
Other assets	(3,542,000)	(7,545,000)	(8,283,000)
Accounts payable and accrued expenses	(13,663,000)	3,658,000	16,246,000
Other liabilities	12,224,000	(1,185,000)	(37,538,000)
Net cash provided by operating activities	277,859,000	246,637,000	244,306,000
Cash Flows from Investing Activities:
Additions to real estate	(100,526,000)	(125,805,000)	(112,001,000)
Investments in and contributions of capital to unconsolidated joint ventures	(40,715,000)	(15,812,000)	(11,750,000)
Advances to a partner in One Steuart Lane	(35,715,000)
Repayment of advances by a partner in One Steuart Lane	38,935,000
Investment in a mezzanine loan	(20,000,000)
Contributions of capital to unconsolidated real estate related funds	(2,077,000)	(5,018,000)	(3,324,000)
Due from affiliates		(59,000,000)
Repayment of amounts due from affiliates		59,000,000
Distributions of capital from unconsolidated real estate related funds		1,506,000	4,926,000
Investment in real estate related funds		(7,454,000)
Sales of marketable securities			40,228,000
Purchases of marketable securities			(21,562,000)
Net cash used in investing activities	(160,098,000)	(152,583,000)	(103,483,000)
Cash Flows from Financing Activities:
Repayment of notes and mortgages payable	(273,000,000)		(850,000,000)
Proceeds from notes and mortgages payable	232,050,000		888,566,000
Contributions from noncontrolling interests in consolidated real estate related funds	55,837,000	3,257,000
Distributions to noncontrolling interests in consolidated real estate related funds	(8,828,000)
Dividends paid to common stockholders	(48,873,000)	(67,062,000)	(61,297,000)
Distributions paid to common unitholders	(3,808,000)	(5,962,000)	(6,182,000)
Contributions from noncontrolling interests in consolidated joint ventures			121,000
Distributions to noncontrolling interests in consolidated joint ventures	(8,657,000)	(40,699,000)	(30,539,000)
Settlement of accounts payable in connection with repurchases of common shares	(1,847,000)
Debt issuance costs	(648,000)		(16,915,000)
Repurchase of shares related to stock compensation agreements and related tax withholdings	(205,000)	(284,000)	(235,000)
Repurchases of common shares		(63,153,000)
Net cash used in financing activities	(57,979,000)	(173,903,000)	(76,481,000)
Net increase (decrease) in cash and cash equivalents and restricted cash	59,782,000	(79,849,000)	64,342,000
Cash and cash equivalents and restricted cash at beginning of period	449,817,000	529,666,000	465,324,000
Cash and cash equivalents and restricted cash at end of period	509,599,000	449,817,000	529,666,000
Reconciliation of Cash and Cash Equivalents and Restricted Cash:
Cash and cash equivalents at beginning of period	408,905,000	524,900,000	434,530,000
Restricted cash at beginning of period	40,912,000	4,766,000	30,794,000
Cash and cash equivalents and restricted cash at beginning of period	449,817,000	529,666,000	465,324,000
Cash and cash equivalents at end of period	428,208,000	408,905,000	524,900,000
Restricted cash at end of period	81,391,000	40,912,000	4,766,000
Cash and cash equivalents and restricted cash at end of period	509,599,000	449,817,000	529,666,000
Supplemental Disclosure of Cash Flow Information:
Cash payments for interest	144,388,000	139,332,000	132,476,000
Cash payments for income taxes, net of refunds	893,000	2,711,000	1,762,000
Non-Cash Transactions:
Common shares issued upon redemption of common units	11,871,000	128,743,000	961,000
Dividends and distributions declared but not yet paid	8,360,000	18,026,000	16,895,000
Change in value of interest rate swaps and interest rate caps	(25,444,000)	31,839,000	6,857,000
Write-off of fully amortized and/or depreciated assets	34,317,000	11,386,000	46,594,000
Additions to real estate included in accounts payable and accrued expenses	$ 21,815,000	14,595,000	12,177,000
Transfer of deposit to investment in unconsolidated joint ventures		6,230,000	$ 6,230,000
Repurchases of common shares included in accounts payable and accrued expenses		1,847,000
Increase (decrease) due to consolidation of real estate related fund investments that were previously unconsolidated:
Real estate related fund investments		100,500,000
Investments in unconsolidated real estate related funds		(8,965,000)
Noncontrolling interests in consolidated real estate related funds		$ 91,535,000

[1] Includes $761 of expense from the non-cash write-off of deferred financing costs in connection with the $860,000 refinancing of 1301 Avenue of the Americas in July 2021.