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Multi-family Loans, at Fair Value - Preferred Equity and Mezzanine Loan Investments (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Investment amount | $ 95,434 | $ 88,249
Unrealized gains (losses) | 358 | (715)
Total, at Fair Value | $ 95,792 | $ 87,534

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