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Related Party Transactions (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Related Party Transaction [Line Items]        
Management fees     $ 5,199,000 $ 20,252,000
Manager | General and Administrative Expense | Management Fees        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction     5,200,000 20,300,000
Affiliated entity | iStar Inc.        
Related Party Transaction [Line Items]        
Management fee, percent, threshold one 1.00%      
Management fee, percent, threshold two 1.25%      
Management fee, percent, threshold three 1.375%      
Management fee, percent, threshold four 1.50%      
Management fee, transaction share price (in dollars per share) $ 20      
Management fee paid with common stock, period of restriction from selling stock 2 years      
Termination fee, percent of prior years management fee 300.00%      
Affiliated entity | Manager | iStar Inc. | General and Administrative Expense | Incentive Fee        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction $ 0      
Affiliated entity | Minimum | iStar Inc.        
Related Party Transaction [Line Items]        
Management fee, shareholders' equity, incremental threshold amount two 1,500,000,000      
Management fee, shareholders' equity, incremental threshold amount three 3,000,000,000      
Management fee, shareholders' equity, incremental threshold amount four 5,000,000,000      
Affiliated entity | Maximum | iStar Inc.        
Related Party Transaction [Line Items]        
Management fee, shareholders' equity, incremental threshold amount one 1,500,000,000      
Management fee, shareholders' equity, incremental threshold amount two 3,000,000,000      
Management fee, shareholders' equity, incremental threshold amount three $ 5,000,000,000      
iStar Inc. | General and Administrative Expense        
Related Party Transaction [Line Items]        
Related Party Transaction, Amounts of Transaction     $ 3,100,000 $ 12,500,000
iStar, Inc. | Minimum        
Related Party Transaction [Line Items]        
Number of years as active real estate investor   20 years