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Equity Investments in Ground Leases (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2024
Dec. 31, 2021
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Jul. 31, 2024
Jun. 30, 2022
Feb. 28, 2022
Nov. 30, 2021
Jun. 30, 2021
Schedule of Equity Method Investments [Line Items]                        
Carrying value [1]     $ 261,107   $ 261,107   $ 250,034          
Earnings (losses) from equity method investments     4,912 $ 6,469 9,904 $ 13,381            
Ground Lease acquisition purchase price         54,948 110,206            
Land and Related Ground Lease                        
Schedule of Equity Method Investments [Line Items]                        
Leasehold improvement allowance, funded amount     51,800   51,800              
Ground Lease Plus Fund                        
Schedule of Equity Method Investments [Line Items]                        
Ground Lease acquisition purchase price $ 38,300                      
iStar Inc.                        
Schedule of Equity Method Investments [Line Items]                        
Value of land acquired                     $ 33,300  
iStar Inc. | Ground Lease Plus Fund                        
Schedule of Equity Method Investments [Line Items]                        
Gain (loss) from sale of Ground Lease   $ 0                    
425 Park Avenue | Equity Method Venture                        
Schedule of Equity Method Investments [Line Items]                        
Carrying value     138,629   138,629   137,348          
Earnings (losses) from equity method investments     $ 887 856 $ 1,772 1,735            
Ownership percentage     54.80%   54.80%              
32 Old Slip                        
Schedule of Equity Method Investments [Line Items]                        
Carrying value     $ 65,858   $ 65,858   57,574          
Earnings (losses) from equity method investments     1,323 1,417 2,754 2,842            
Ownership percentage                       29.20%
Ground Lease Plus Fund                        
Schedule of Equity Method Investments [Line Items]                        
Carrying value     30,340   30,340   30,103          
Earnings (losses) from equity method investments     330 453 814 1,342            
Basis difference in equity investment to be amortized     19,600   19,600              
Amortization of basis difference in equity investments     $ (100) (100) $ (200) 100            
Weighted average remaining term         105 years 1 month 6 days              
Ownership percentage     53.20%   53.20%              
Leasehold Loan Fund                        
Schedule of Equity Method Investments [Line Items]                        
Carrying value     $ 26,280   $ 26,280   $ 25,009          
Earnings (losses) from equity method investments     2,372 3,743 4,564 7,462            
Basis difference in equity investment to be amortized     5,100   5,100              
Amortization of basis difference in equity investments     $ 700 $ 2,200 $ 1,400 $ 3,200            
Weighted average remaining term         1 year 9 months 18 days              
Ownership percentage     53.20%   53.20%              
Leasehold Loan Fund | Life science property                        
Schedule of Equity Method Investments [Line Items]                        
Commitment to provide loan to Ground lessee                   $ 130,000    
Leasehold improvement allowance, funded amount     $ 11,000   $ 11,000              
Leasehold Loan Fund | Mixed-use property                        
Schedule of Equity Method Investments [Line Items]                        
Commitment to provide loan to Ground lessee                 $ 105,000      
Loan commitment to Ground lessee that has been funded     43,700   43,700              
Leasehold Loan Fund | Student housing project                        
Schedule of Equity Method Investments [Line Items]                        
Commitment to provide loan to Ground lessee               $ 31,500        
Leasehold improvement allowance, funded amount     $ 4,900   $ 4,900              
[1] Refer to Note 2 for details on the Company’s consolidated variable interest entities (“VIEs”).