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Notes Receivable, Net - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Accounts Notes And Loans Receivable [Line Items] |  |  |
Increase in allowance for credit loss |  | $ 500 |
Notes receivable |  | $ 159,638 | $ 102,100
OP Units in settlement of note receivable |  | 21,109 |
Settlement amount of note receivable in OP units |  | $ 500 |
Note receivable accrued interest |  | 19,208 | 13,917
Notes Receivable |  | 158,468 | 101,450
Credit loss reserve |  | 1,170 | 650
Notes receivable, net |  | $ 158,468 | 101,450
Interest Rate |  | 9.00% |
Additional credit loss reserve |  |  | 300
Aggregate loans |  | $ 158,468 | 101,450
LUF Portfolio |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Note receivable accrued interest |  |  | $ 5,000
Interest Rate |  |  | 8.00%
Percentage of mortgage loan collateralized |  |  | 5000.00%
Core Note |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Notes receivable modified, subsequent payment default |  | 21,600 | $ 21,600
850 Third Avenue Brooklyn, NY |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Notes Receivable |  |  | 54,000
Notes receivable, net |  |  | $ 54,000
Interest Rate |  |  | 9.00%
Fund II |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Notes receivable |  |  | $ 33,800
Note receivable accrued interest |  |  | 600
Notes Receivable |  |  | 33,800
Notes receivable, net |  |  | 33,800
Fund III |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Notes receivable modified, subsequent payment default |  | $ 10,000 |
ASU 2016-13 |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Credit loss reserve |  |  | 400
Maximum |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Interest Rate |  | 12.00% |
Minimum |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Interest Rate |  | 5.00% |
Core Portfolio |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Notes receivable | [1] | $ 154,332 | 96,794
Core Portfolio | Silver Spring, Maryland |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Notes Receivable |  | 16,000 |
Notes receivable, net |  | 16,000 |
Core Portfolio | Soho, New York |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Notes Receivable |  | 43,000 |
Notes receivable, net |  | $ 43,000 |
Core Portfolio | Maximum |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Interest Rate | [1] | 12.00% |
Core Portfolio | Minimum |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Interest Rate | [1] | 5.00% |
Core Portfolio | Three Tranches |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Notes Receivable |  | $ 42,000 |
Notes receivable, net |  | 42,000 |
Structured Financing |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Note receivable accrued interest |  | 8,800 |
Aggregate loans |  | 37,900 |
Structured Financing | Non-Collateral Dependent Loans |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Note receivable accrued interest |  | 10,400 |
Credit loss reserve |  | 1,200 |
Loans amortized cost |  | $ 140,900 |
Brandywine Portfolio | Core Portfolio |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Notes receivable |  |  | 38,700
Note receivable accrued interest |  |  | $ 2,000
Equity method investment, ownership percentage by third party |  |  | 24.78%
[1] | Includes one and two notes receivable from OP Unit holders, with balances totaling $6.0 million and $6.5 million at September 30, 2021 and December 31, 2020, respectively

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