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Segment Reporting - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Revenues:          
Revenue, excluding third-party management and other fees $ 197,326 $ 199,328 $ 567,803 $ 569,409  
Intercompany rental revenue 0 0 0 0  
Total revenues, excluding third-party management and other fees 197,326 199,328 567,803 569,409  
Segment operating expenses:          
Property operating expenses 46,957 45,954 136,897 132,530  
Observatory expenses 9,510 9,715 27,450 27,104  
Other segment expenses 35,572 34,313 105,892 103,100  
Total segment operating expenses 92,039 89,982 270,239 262,734  
Net operating income 105,287 109,346 297,564 306,675  
Segment assets 4,106,279 4,436,937 4,106,279 4,436,937 $ 4,510,287
Intersegment Elimination          
Revenues:          
Revenue, excluding third-party management and other fees 0 0 0 0  
Intercompany rental revenue (20,185) (23,461) (56,011) (60,508)  
Total revenues, excluding third-party management and other fees (20,185) (23,461) (56,011) (60,508)  
Segment operating expenses:          
Property operating expenses 0 0 0 0  
Observatory expenses 0 0 0 0  
Other segment expenses (20,185) (23,461) (56,011) (60,508)  
Total segment operating expenses (20,185) (23,461) (56,011) (60,508)  
Net operating income 0 0 0 0  
Segment assets 0 0 0 0  
Real Estate | Operating Segments          
Revenues:          
Revenue, excluding third-party management and other fees 161,289 159,946 474,706 471,307  
Intercompany rental revenue 20,185 23,461 56,011 60,508  
Total revenues, excluding third-party management and other fees 181,474 183,407 530,717 531,815  
Segment operating expenses:          
Property operating expenses 46,957 45,954 136,897 132,530  
Observatory expenses 0 0 0 0  
Other segment expenses 35,572 34,313 105,892 103,100  
Total segment operating expenses 82,529 80,267 242,789 235,630  
Net operating income 98,945 103,140 287,928 296,185  
Segment assets 3,840,603 4,174,754 3,840,603 4,174,754  
Observatory | Operating Segments          
Revenues:          
Revenue, excluding third-party management and other fees 36,037 39,382 93,097 98,102  
Intercompany rental revenue 0 0 0 0  
Total revenues, excluding third-party management and other fees 36,037 39,382 93,097 98,102  
Segment operating expenses:          
Property operating expenses 0 0 0 0  
Observatory expenses 9,510 9,715 27,450 27,104  
Other segment expenses 20,185 23,461 56,011 60,508  
Total segment operating expenses 29,695 33,176 83,461 87,612  
Net operating income 6,342 6,206 9,636 10,490  
Segment assets $ 265,676 $ 262,183 $ 265,676 $ 262,183