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Equity Investments, at Fair Value - Schedule of Gain (Loss) on Equity Instruments (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |
Other income (losses) | $ 16,289,000 | $ 5,515,000 | $ 678,000
Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other income (losses) | 2,900,000 | 2,800,000 |
Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other income (losses) | (3,600,000) | 400,000 | 300,000
Joint Venture Equity Investments in Multi-Family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other income (losses) | (1,400,000) | 200,000 | (9,700,000)
Realized gains (losses), net | 0 | 0 | 8,800,000
Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 18,670,000 | 24,633,000 | 16,587,000
Equity investments | Single-Family Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | (2,166,000) | 9,113,000 | 11,032,000
Equity investments | Joint Venture Equity Investments in Multi-Family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | (1,430,000) | 150,000 | (949,000)
Somerset Deerfield Investor, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 1,944,000 | 2,295,000 | 2,168,000
RS SWD Owner, LLC, RS SWD Mitchell Owner, LLC, RS SWD IF Owner, LLC, RS SWD Mullis Owner, LLC, RS SWD JH Mullis Owner, LLC and RS SWD Saltzman Owner, LLC (collectively) | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 529,000 | 585,000 | 551,000
Walnut Creek Properties Holdings, L.L.C. | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | (153,000) | 1,240,000 | 928,000
DCP Gold Creek, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 254,000 | 780,000 | 701,000
1122 Chicago DE, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 959,000 | 908,000 | 835,000
Rigsbee Ave Holdings, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | (174,000) | 1,683,000 | 1,148,000
Bighaus, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 1,852,000 | 1,786,000 | 1,002,000
FF/RMI 20 Midtown, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 2,904,000 | 3,059,000 | 686,000
Lurin-RMI, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 558,000 | 931,000 | 81,000
Palms at Cape Coral, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 554,000 | 342,000 | 0
America Walks at Port St. Lucie, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 3,140,000 | 1,678,000 | 0
EHOF-NYMT Sunset Apartments Preferred, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 1,939,000 | 661,000 | 0
Lucie at Tradition Holdings, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 2,008,000 | 484,000 | 0
Syracuse Apartments and Townhomes, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 1,816,000 | 0 | 0
Hudson Bridge Apartments, LLC - Series A, Briar Hill Apartments, LLC, Kings Glen Apartments, LLC, Flagstone Apartments, LLC, Brookfield Apartments II, LLC - Series B, and Silber JBSM Properties, LLC (collectively) | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 540,000 | 0 | 0
BBA-EP320 II, L.L.C., BBA-Ten10 II, L.L.C., and Lexington on the Green Apartments, L.L.C. (collectively) | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | 1,304,000 | 1,260,000
Audubon Mezzanine Holdings, L.L.C. (Series A) | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | 1,251,000 | 1,213,000
EP 320 Growth Fund, L.L.C. (Series A) and Turnbury Park Apartments - BC, L.L.C. (Series A) (collectively) | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | 735,000 | 782,000
Towers Property Holdings, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | 1,192,000 | 1,243,000
Mansions Property Holdings, LLC | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | 1,148,000 | 1,198,000
Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively) | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | 412,000 | 454,000
Gen1814, LLC - Series A, Highlands - Mtg. Holdings, LLC - Series A, and Polos at Hudson Investments, LLC - Series A (collectively) | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | 966,000 | 1,044,000
Axis Apartments Holdings, LLC, Arbor-Stratford Holdings II, LLC - Series B, Highlands - Mtg. Holdings, LLC - Series B, Oakley Shoals Apartments, LLC - Series C, and Woodland Park Apartments II, LLC (collectively) | Equity investments | Multi-Family Preferred Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | 1,193,000 | 1,293,000
Morrocroft Neighborhood Stabilization Fund II, LP | Equity investments | Single-Family Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | (416,000) | 6,378,000 | 1,519,000
Constructive Loans, LLC | Equity investments | Single-Family Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Other income (losses) | (1,800,000) | 2,800,000 |
Changes in fair value, gain (loss) | (1,750,000) | 2,750,000 | 0
Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I) | Equity investments | Single-Family Equity Ownership Interests |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | 0 | (15,000) | 9,513,000
GWR Cedars Partners, LLC | Equity investments | Joint Venture Equity Investments in Multi-Family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | (1,050,000) | 60,000 | 0
GWR Gateway Partners, LLC | Equity investments | Joint Venture Equity Investments in Multi-Family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | (380,000) | 90,000 | 0
The Preserve at Port Royal Venture, LLC | Equity investments | Joint Venture Equity Investments in Multi-Family Properties |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Changes in fair value, gain (loss) | $ 0 | $ 0 | $ (949,000)

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