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Assets and Liabilities of Disposal Group Held for Sale - Narrative (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2025
USD ($)
jointVenture
Sep. 30, 2024
jointVenture
Jun. 30, 2024
jointVenture
Sep. 30, 2025
USD ($)
jointVenture
Sep. 30, 2024
USD ($)
jointVenture
Jun. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
jointVenture
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
jointVenture
Dec. 31, 2024
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Net payments made on mortgages payable on real estate               $ 97,729,000 $ 33,262,000  
Gains on sale of real estate               8,592,000 0  
Loss on extinguishment of collateralized debt obligations and mortgages payable on real estate       $ 448,000 $ 1,699,000     448,000 2,391,000  
Net income attributable to noncontrolling interest       (5,035,000) (2,383,000)     (14,231,000) (33,034,000)  
Net income       44,820,000 42,849,000     95,522,000 (30,640,000)  
Impairment of real estate       1,619,000 7,823,000     9,437,000 48,142,000  
VIE, Primary Beneficiary                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Net income attributable to noncontrolling interest       (4,241,000) (565,000)     (11,966,000) (19,543,000)  
VIE, Primary Beneficiary | Disposal Group, Held-for-Sale, Not Discontinued Operations                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Noncontrolling interest in VIE       $ 600,000       600,000   $ 2,000,000.0
Multifamily                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of joint ventures owned, no longer held for sale | jointVenture             1      
Loss on transfer of real estate to held for sale           $ 1,800,000        
Multifamily | Disposal Group, Held-for-Sale, Not Discontinued Operations                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Number of joint ventures, classified as held for sale during period | jointVenture 2 2 5              
Loss on transfer of real estate to held for sale         2,000,000.0          
Impairment of real estate         $ 3,800,000     7,200,000 $ 25,800,000  
Multifamily | VIE, Primary Beneficiary                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Loss on sale of real estate             $ (14,600,000)      
Number of joint ventures, classified as held for sale during period | jointVenture                 2  
Number of equity investments sold | jointVenture         4       6  
Realized loss on de-consolidation of multi-family loans held in securitization trusts and multi-family collateralized debt obligations, net         $ (3,400,000)       $ (3,700,000)  
Net payments made on mortgages payable on real estate         (24,100,000)          
Gains on sale of real estate         6,600,000          
Loss on extinguishment of collateralized debt obligations and mortgages payable on real estate         (100,000)          
Impairment of real estate         $ 4,600,000     $ 0 $ 18,400,000  
Multifamily | VIE, Primary Beneficiary | Disposal Group, Held-for-Sale, Not Discontinued Operations                    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                    
Loss on transfer of real estate to held for sale $ 0                  
Number of joint ventures, classified as held for sale, real estate sold | jointVenture       2 1          
Proceeds from sale of real estate       $ 108,600,000 $ 56,400,000          
Net payments made on mortgages payable on real estate       89,600,000 31,800,000          
Gains on sale of real estate       600,000 11,400,000          
Loss on extinguishment of collateralized debt obligations and mortgages payable on real estate       400,000 1,600,000          
Net income attributable to noncontrolling interest       13,500 1,100,000          
Net income       100,000 $ 8,700,000          
Gain (loss) on sale of ownership interests       $ 0