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Agreements and Transactions with Related Parties - Other Related Party (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2026
USD ($)
entity
shares
Mar. 31, 2025
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
property
loan
Dec. 31, 2025
USD ($)
Nov. 30, 2025
USD ($)
Agreements and Transactions with Related Parties              
Due from related party $ 35,251         $ 6,534  
Due to related party 1,758         $ 501  
Other Related Party Transactions | Related Party              
Agreements and Transactions with Related Parties              
Reimbursement for flights chartered by the company's executives $ 200 $ 300          
Other Related Party Transactions | Related Party | ACM Acquisition | ACM              
Agreements and Transactions with Related Parties              
Number of shares held by related party (in shares) | shares 2,535,870            
Number of operating units held by related party (in shares) | shares 10,483,930            
Aggregate percentage of voting power held by related party 6.20%            
Other Related Party Transactions | Related Party | Bridge loans              
Agreements and Transactions with Related Parties              
Principal amount             $ 67,900
Base spread, percentage             2.50%
Other Related Party Transactions | Related Party | Maturity Date Of June 2021 | Bridge loans              
Agreements and Transactions with Related Parties              
Number of bridge loans originated | loan         12    
Principal amount         $ 280,500    
Number of multifamily properties renovated | property         72    
Other Related Party Transactions | Related Party | Maturity date of March 2030 | Private Label | Lexford Portfolio              
Agreements and Transactions with Related Parties              
Fixed rate of interest     3.30%        
Other Related Party Transactions | Related Party | Maturity date December 2029 | Bridge loans | Lexford Portfolio              
Agreements and Transactions with Related Parties              
Maximum exposure under guaranty $ 296,000            
Other Related Party Transactions | Chief executive officer              
Agreements and Transactions with Related Parties              
Percentage of our former manager's outstanding membership interest of related party in another related party 35.00%            
Other Related Party Transactions | Chief executive officer | Minimum              
Agreements and Transactions with Related Parties              
Ownership percentage limit of our common stock under company charter 5.00%            
Other Related Party Transactions | Director              
Agreements and Transactions with Related Parties              
Number of Kaufman entities | entity 2            
Lexford Portfolio | Other Related Party Transactions | Related Party              
Agreements and Transactions with Related Parties              
Management fee, percentage of gross revenues of underlying properties 4.75%            
Lexford Portfolio | Other Related Party Transactions | Related Party | Maturity Date Of June 2021 | Bridge loans              
Agreements and Transactions with Related Parties              
Base spread, percentage         4.00%    
Payoffs and partial paydowns of principal       $ 250,000      
Unsecured financing provided by an unsecured lender to certain parent entities of the property owners         $ 50,000    
Lexford Portfolio | Other Related Party Transactions | Related Party | Maturity date of March 2030 | Private Label              
Agreements and Transactions with Related Parties              
Principal amount     $ 34,600