Segment Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Revenues:
Rental revenue	$ 153,882	$ 140,091
Intercompany rental revenue	0	0
Observatory revenue	24,596	22,154
Third-party management and other fees	265	427
Other revenue and fees	2,436	1,950
Total revenues	181,179	164,622
Operating expenses:
Property operating expenses	45,060	42,044
Intercompany rent expense	0	0
Ground rent expenses	2,331	2,331
General and administrative expenses	15,972	15,708
Observatory expenses	8,431	7,855
Real estate taxes	32,241	31,788
Depreciation and amortization	46,081	47,408
Total operating expenses	150,116	147,134
Total operating income (loss)	31,063	17,488
Other income (expense):
Interest income	4,178	2,595
Interest expense	(25,128)	(25,304)
Loss on early extinguishment of debt	(553)	0
Gain on sale of property	0	15,696
Income (loss) before income taxes	9,560	10,475
Income tax (expense) benefit	655	1,219
Net income (loss)	10,215	11,694
Segment assets	4,190,587	4,157,363	$ 4,219,333
Expenditures for segment assets	47,684	34,594
Intersegment Elimination
Revenues:
Rental revenue	0	0
Intercompany rental revenue	(16,067)	(15,914)
Observatory revenue	0	0
Third-party management and other fees	0	0
Other revenue and fees	0	0
Total revenues	(16,067)	(15,914)
Operating expenses:
Property operating expenses	0	0
Intercompany rent expense	(16,067)	(15,914)
Ground rent expenses	0	0
General and administrative expenses	0	0
Observatory expenses	0	0
Real estate taxes	0	0
Depreciation and amortization	0	0
Total operating expenses	(16,067)	(15,914)
Total operating income (loss)	0	0
Other income (expense):
Interest income	0	0
Interest expense	0	0
Loss on early extinguishment of debt	0
Gain on sale of property		0
Income (loss) before income taxes	0	0
Income tax (expense) benefit	0	0
Net income (loss)	0	0
Segment assets	0	0
Expenditures for segment assets	0	0
Real Estate | Operating Segments
Revenues:
Rental revenue	153,882	140,091
Intercompany rental revenue	16,067	15,914
Observatory revenue	0	0
Third-party management and other fees	265	427
Other revenue and fees	2,436	1,950
Total revenues	172,650	158,382
Operating expenses:
Property operating expenses	45,060	42,044
Intercompany rent expense	0	0
Ground rent expenses	2,331	2,331
General and administrative expenses	15,972	15,708
Observatory expenses	0	0
Real estate taxes	32,241	31,788
Depreciation and amortization	46,044	47,364
Total operating expenses	141,648	139,235
Total operating income (loss)	31,002	19,147
Other income (expense):
Interest income	4,140	2,558
Interest expense	(25,128)	(25,304)
Loss on early extinguishment of debt	(553)
Gain on sale of property		15,696
Income (loss) before income taxes	9,461	12,097
Income tax (expense) benefit	(113)	(198)
Net income (loss)	9,348	11,899
Segment assets	3,931,685	3,903,661
Expenditures for segment assets	47,645	34,536
Observatory | Operating Segments
Revenues:
Rental revenue	0	0
Intercompany rental revenue	0	0
Observatory revenue	24,596	22,154
Third-party management and other fees	0	0
Other revenue and fees	0	0
Total revenues	24,596	22,154
Operating expenses:
Property operating expenses	0	0
Intercompany rent expense	16,067	15,914
Ground rent expenses	0	0
General and administrative expenses	0	0
Observatory expenses	8,431	7,855
Real estate taxes	0	0
Depreciation and amortization	37	44
Total operating expenses	24,535	23,813
Total operating income (loss)	61	(1,659)
Other income (expense):
Interest income	38	37
Interest expense	0	0
Loss on early extinguishment of debt	0
Gain on sale of property		0
Income (loss) before income taxes	99	(1,622)
Income tax (expense) benefit	768	1,417
Net income (loss)	867	(205)
Segment assets	258,902	253,702
Expenditures for segment assets	$ 39	$ 58