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Equity (Details)
 9 Months Ended
Sep. 30, 2023
class
shares
Mar. 31, 2023
shares
Dec. 31, 2022
shares
Sep. 30, 2022
shares
Equity        
Percentage of common shares of beneficial interest distributed at Spin-off   100.00%    
Pro rata distribution of common shares issued for each outstanding share of iStar common share at Spin-off. 0.153 0.153   0.153
Number of classes of common stock | class 1      
Common Stock, shares outstanding (in shares) 13,319,552   0