Segment Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Revenues:
Revenue, excluding third-party management and other fees	$ 766,787	$ 766,753	$ 738,221
Intercompany rental revenue	0	0	0
Total revenues, excluding third-party management and other fees	766,787	766,753	738,221
Segment operating expenses:
Property operating expenses	184,714	179,175	167,324
Observatory expenses	38,237	36,834	35,265
Other segment expenses	142,066	138,152	136,427
Total segment operating expenses	365,017	354,161	339,016
Total operating income	401,770	412,592	399,205
Segment assets	4,468,961	4,510,287	4,219,333
Intersegment Elimination
Revenues:
Revenue, excluding third-party management and other fees	0	0	0
Intercompany rental revenue	(76,306)	(83,477)	(80,514)
Total revenues, excluding third-party management and other fees	(76,306)	(83,477)	(80,514)
Segment operating expenses:
Property operating expenses	0	0	0
Observatory expenses	0	0	0
Other segment expenses	(76,306)	(83,477)	(80,514)
Total segment operating expenses	(76,306)	(83,477)	(80,514)
Total operating income	0	0	0
Segment assets	0	0	0
Real Estate \| Operating segments
Revenues:
Revenue, excluding third-party management and other fees	638,458	630,376	608,855
Intercompany rental revenue	76,306	83,477	80,514
Total revenues, excluding third-party management and other fees	714,764	713,853	689,369
Segment operating expenses:
Property operating expenses	184,714	179,175	167,324
Observatory expenses	0	0	0
Other segment expenses	142,066	138,152	136,427
Total segment operating expenses	326,780	317,327	303,751
Total operating income	387,984	396,526	385,618
Segment assets	4,199,686	4,242,953	3,957,659
Observatory \| Operating segments
Revenues:
Revenue, excluding third-party management and other fees	128,329	136,377	129,366
Intercompany rental revenue	0	0	0
Total revenues, excluding third-party management and other fees	128,329	136,377	129,366
Segment operating expenses:
Property operating expenses	0	0	0
Observatory expenses	38,237	36,834	35,265
Other segment expenses	76,306	83,477	80,514
Total segment operating expenses	114,543	120,311	115,779
Total operating income	13,786	16,066	13,587
Segment assets	$ 269,275	$ 267,334	$ 261,674