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Equity Investments in Ground Leases (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2024
USD ($)
Jan. 31, 2022
USD ($)
lease
Dec. 31, 2021
USD ($)
Jun. 30, 2021
agreement
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2022
USD ($)
Feb. 28, 2022
USD ($)
Nov. 30, 2021
USD ($)
Schedule of Equity Method Investments [Line Items]                    
Carrying value [1]         $ 310,320 $ 180,388        
Earnings from equity method investments         24,229 9,055 $ 6,279      
Ground lease acquisition purchase price         225,840          
Ground Lease Plus Fund | Subsequent Events                    
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
Gain (loss) from sale of Ground Lease     $ 0              
Number of agreements entered into to acquire land and related Ground Lease | agreement       2            
iStar Inc. | Ground Lease Plus Fund                    
Schedule of Equity Method Investments [Line Items]                    
Gain (loss) from sale of Ground Lease   $ 500                
Number of Ground Leases sold | lease   2                
425 Park Avenue                    
Schedule of Equity Method Investments [Line Items]                    
Carrying value         135,288 133,118        
Earnings from equity method investments         $ 3,536 3,403 3,348      
Ownership percentage         54.80%          
32 Old Slip                    
Schedule of Equity Method Investments [Line Items]                    
Carrying value         $ 52,425 47,270        
Earnings from equity method investments         5,670 $ 5,652 $ 2,931      
Ownership percentage       29.20%            
Ground Lease Plus Fund                    
Schedule of Equity Method Investments [Line Items]                    
Carrying value         73,428          
Earnings from equity method investments         5,415          
Basis difference in equity investment to be amortized         19,400          
Amortization of basis difference in equity investments         $ 2,400          
Weighted average remaining term         105 years          
Ownership percentage         53.00%          
Leasehold Loan Fund                    
Schedule of Equity Method Investments [Line Items]                    
Carrying value         $ 49,179          
Earnings from equity method investments         9,608          
Basis difference in equity investment to be amortized         11,200          
Amortization of basis difference in equity investments         $ 3,000          
Weighted average remaining term         3 years 1 month 6 days          
Leasehold Loan Fund | Life science property                    
Schedule of Equity Method Investments [Line Items]                    
Commitment to provide loan to Ground lessee                 $ 130,000  
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         $ 40,300          
[1] Refer to Note 2 for details on the Company’s consolidated variable interest entities ("VIEs").