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DEBT - Mortgages Payable and Secured Borrowings Government Guaranteed Loans (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Outstanding balance $ 481,513  
Mortgage Payable    
Debt Instrument [Line Items]    
Outstanding balance 250,700 $ 250,700
Mortgage Payable | Fixed Rate Mortgage Payable    
Debt Instrument [Line Items]    
Outstanding balance 163,700 163,700
Mortgage Payable | Fixed Rate Mortgage Payable | One Kaiser Plaza, Oakland, California    
Debt Instrument [Line Items]    
Outstanding balance $ 97,100  
Mortgage Payable | Fixed Rate Mortgage Payable Due July 1, 2026    
Debt Instrument [Line Items]    
Fixed interest rate 4.14%  
Mortgage Payable | Fixed Rate Mortgage Payable Due July 7, 2025    
Debt Instrument [Line Items]    
Fixed interest rate 6.25%  
Maturity extension option 1 year  
Mortgage Payable | Variable Rate Mortgages Payable    
Debt Instrument [Line Items]    
Outstanding balance $ 87,000 $ 87,000
Interest rate margin 3.36%  
Secured borrowing principal on SBA 7(a) loans sold for a premium and excess spread    
Debt Instrument [Line Items]    
Excess spread $ 355  
Weighted average rate 9.21%  
Secured borrowing principal on SBA 7(a) loans sold for excess spread    
Debt Instrument [Line Items]    
Excess spread $ 1,500  
Weighted average rate 6.87%