Property Loans, Net of Loan Loss Allowances - Summary of Partnership's Remaining Property Loan Commitments (Parenthetical) (Details)	Sep. 30, 2021
LIBOR [Member]
Accounts Notes And Loans Receivable [Line Items]
Floor interest rate	0.50%
SOFR [Member]
Accounts Notes And Loans Receivable [Line Items]
Floor interest rate	0.50%
SOFR [Member] | Willow Place Apartments [Member]
Accounts Notes And Loans Receivable [Line Items]
Floor interest rate	0.25%