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Segment Reporting - Schedule of Components of Segment Net Income for Each Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Revenues:      
Revenue, excluding third-party management and other fees $ 190,048 $ 179,635  
Intercompany rental revenue 0 0  
Total revenues, excluding third-party management and other fees 190,048 179,635  
Segment operating expenses:      
Property operating expenses 47,744 45,060  
Observatory expenses 7,868 8,118  
Other segment expenses 36,944 35,381  
Total segment operating expenses 92,556 88,559  
Net operating income (loss) 97,492 91,076  
Segment assets 4,405,724 4,114,380 $ 4,468,961
Operating Segments | Real Estate      
Revenues:      
Revenue, excluding third-party management and other fees 171,538 156,474  
Intercompany rental revenue 12,821 15,160  
Total revenues, excluding third-party management and other fees 184,359 171,634  
Segment operating expenses:      
Property operating expenses 47,744 45,060  
Observatory expenses 0 0  
Other segment expenses 36,944 35,381  
Total segment operating expenses 84,688 80,441  
Net operating income (loss) 99,671 91,193  
Segment assets 4,142,347 3,851,216  
Operating Segments | Observatory      
Revenues:      
Revenue, excluding third-party management and other fees 18,510 23,161  
Intercompany rental revenue 0 0  
Total revenues, excluding third-party management and other fees 18,510 23,161  
Segment operating expenses:      
Property operating expenses 0 0  
Observatory expenses 7,868 8,118  
Other segment expenses 12,821 15,160  
Total segment operating expenses 20,689 23,278  
Net operating income (loss) (2,179) (117)  
Segment assets 263,377 263,164  
Intersegment Elimination      
Revenues:      
Revenue, excluding third-party management and other fees 0 0  
Intercompany rental revenue (12,821) (15,160)  
Total revenues, excluding third-party management and other fees (12,821) (15,160)  
Segment operating expenses:      
Property operating expenses 0 0  
Observatory expenses 0 0  
Other segment expenses (12,821) (15,160)  
Total segment operating expenses (12,821) (15,160)  
Net operating income (loss) 0 0  
Segment assets $ 0 $ 0