Segment Reporting - Components of Segment Net Income (Loss) for Each Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Revenues:
Rental revenue	$ 154,603	$ 149,339	$ 294,694	$ 296,853
Intercompany rental revenue	0	0	0	0
Observatory revenue	33,433	27,368	55,587	40,609
Lease termination fees	0	18,859	0	20,032
Third-party management and other fees	381	326	808	636
Other revenue and fees	2,125	2,130	4,075	3,926
Total revenues	190,542	198,022	355,164	362,056
Operating expenses:
Property operating expenses	39,519	37,433	81,563	76,077
Intercompany rent expense	0	0	0	0
Ground rent expenses	2,332	2,332	4,663	4,663
General and administrative expenses	16,075	15,876	31,783	29,562
Observatory expenses	8,657	7,776	16,512	13,991
Real estate taxes	31,490	29,802	63,278	59,806
Depreciation and amortization	46,280	58,304	93,688	125,410
Total operating expenses	144,353	151,523	291,487	309,509
Total operating income (loss)	46,189	46,499	63,677	52,547
Other income (expense):
Interest income	3,339	431	5,934	580
Interest expense	(25,405)	(25,042)	(50,709)	(50,056)
Gain on disposition of property	13,565	27,170	29,261	27,170
Income (loss) before income taxes	37,688	49,058	48,163	30,241
Income tax (expense) benefit	(733)	(363)	486	1,233
Net income	36,955	48,695	48,649	31,474
Segment assets	4,184,768	4,217,231	4,184,768	4,217,231	$ 4,163,594
Expenditures for segment assets	32,908	13,115	35,634	52,290
Intersegment Elimination
Revenues:
Rental revenue	0	0	0	0
Intercompany rental revenue	(20,942)	(17,109)	(36,856)	(27,729)
Observatory revenue	0	0	0	0
Lease termination fees		0		0
Third-party management and other fees	0	0	0	0
Other revenue and fees	0	0	0	0
Total revenues	(20,942)	(17,109)	(36,856)	(27,729)
Operating expenses:
Property operating expenses	0	0	0	0
Intercompany rent expense	(20,942)	(17,109)	(36,856)	(27,729)
Ground rent expenses	0	0	0	0
General and administrative expenses	0	0	0	0
Observatory expenses	0	0	0	0
Real estate taxes	0	0	0	0
Depreciation and amortization	0	0	0	0
Total operating expenses	(20,942)	(17,109)	(36,856)	(27,729)
Total operating income (loss)	0	0	0	0
Other income (expense):
Interest income	0	0	0	0
Interest expense	0	0	0	0
Gain on disposition of property	0	0	0	0
Income (loss) before income taxes	0	0	0	0
Income tax (expense) benefit	0	0	0	0
Net income	0	0	0	0
Segment assets	0	0	0	0
Expenditures for segment assets	0	0	0	0
Real Estate | Operating Segments
Revenues:
Rental revenue	154,603	149,339	294,694	296,853
Intercompany rental revenue	20,942	17,109	36,856	27,729
Observatory revenue	0	0	0	0
Lease termination fees		18,859		20,032
Third-party management and other fees	381	326	808	636
Other revenue and fees	2,125	2,130	4,075	3,926
Total revenues	178,051	187,763	336,433	349,176
Operating expenses:
Property operating expenses	39,519	37,433	81,563	76,077
Intercompany rent expense	0	0	0	0
Ground rent expenses	2,332	2,332	4,663	4,663
General and administrative expenses	16,075	15,876	31,783	29,562
Observatory expenses	0	0	0	0
Real estate taxes	31,490	29,802	63,278	59,806
Depreciation and amortization	46,237	58,254	93,601	125,325
Total operating expenses	135,653	143,697	274,888	295,433
Total operating income (loss)	42,398	44,066	61,545	53,743
Other income (expense):
Interest income	3,289	426	5,847	575
Interest expense	(25,405)	(25,042)	(50,709)	(50,056)
Gain on disposition of property	13,565	27,170	29,261	27,170
Income (loss) before income taxes	33,847	46,620	45,944	31,432
Income tax (expense) benefit	(197)	(38)	(395)	(182)
Net income	33,650	46,582	45,549	31,250
Segment assets	3,928,943	3,969,257	3,928,943	3,969,257
Expenditures for segment assets	32,908	13,115	35,576	51,999
Observatory | Operating Segments
Revenues:
Rental revenue	0	0	0	0
Intercompany rental revenue	0	0	0	0
Observatory revenue	33,433	27,368	55,587	40,609
Lease termination fees		0		0
Third-party management and other fees	0	0	0	0
Other revenue and fees	0	0	0	0
Total revenues	33,433	27,368	55,587	40,609
Operating expenses:
Property operating expenses	0	0	0	0
Intercompany rent expense	20,942	17,109	36,856	27,729
Ground rent expenses	0	0	0	0
General and administrative expenses	0	0	0	0
Observatory expenses	8,657	7,776	16,512	13,991
Real estate taxes	0	0	0	0
Depreciation and amortization	43	50	87	85
Total operating expenses	29,642	24,935	53,455	41,805
Total operating income (loss)	3,791	2,433	2,132	(1,196)
Other income (expense):
Interest income	50	5	87	5
Interest expense	0	0	0	0
Gain on disposition of property	0	0	0	0
Income (loss) before income taxes	3,841	2,438	2,219	(1,191)
Income tax (expense) benefit	(536)	(325)	881	1,415
Net income	3,305	2,113	3,100	224
Segment assets	255,825	247,974	255,825	247,974
Expenditures for segment assets	$ 0	$ 0	$ 58	$ 291