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Equity Investments, at Fair Value (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) from equity investments | $ 10,607 | $ 4,112 | $ 14,006 | $ 4,606 |
Preferred Equity Ownership Interests |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) from equity investments | 800 | 200 | 900 | 4,100 |
Investment in unconsolidated entities | Morrocroft Neighborhood Stabilization Fund II, LP |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Change in fair value, gain (loss) | 998 | 347 | 2,186 | 565 |
Investment in unconsolidated entities | Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I) (1) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Change in fair value, gain (loss) | 3,273 | 1,051 | (15) | 2,051 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Fair Value | 189,746 |  | 189,746 |  | $ 182,765
Change in fair value, gain (loss) | $ 6,336 | 4,024 | $ 11,835 | 3,062 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | BBA-EP320 II, L.L.C., BBA-Ten10 II, L.L.C., and Lexington on the Green Apartments, L.L.C. (collectively) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 45.00% |  | 45.00% |  | 45.00%
Fair Value | $ 12,145 |  | $ 12,145 |  | $ 11,441
Change in fair value, gain (loss) | $ 357 | 358 | $ 704 | 603 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Somerset Deerfield Investor, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 45.00% |  | 45.00% |  | 45.00%
Fair Value | $ 19,373 |  | $ 19,373 |  | $ 18,792
Change in fair value, gain (loss) | $ 675 | 627 | $ 1,141 | 787 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | 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) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 43.00% |  | 43.00% |  | 43.00%
Fair Value | $ 5,438 |  | $ 5,438 |  | $ 5,140
Change in fair value, gain (loss) | $ 174 | 158 | $ 298 | 92 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Audubon Mezzanine Holdings, L.L.C. (Series A) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 57.00% |  | 57.00% |  | 57.00%
Fair Value | $ 12,078 |  | $ 12,078 |  | $ 11,456
Change in fair value, gain (loss) | $ 357 | 284 | $ 721 | 175 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | EP 320 Growth Fund, L.L.C. (Series A) and Turnbury Park Apartments - BC, L.L.C. (Series A) (collectively) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 46.00% |  | 46.00% |  | 46.00%
Fair Value | $ 7,426 |  | $ 7,426 |  | $ 7,234
Change in fair value, gain (loss) | $ 240 | 225 | $ 419 | 124 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Walnut Creek Properties Holdings, L.L.C. |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 36.00% |  | 36.00% |  | 36.00%
Fair Value | $ 9,063 |  | $ 9,063 |  | $ 8,803
Change in fair value, gain (loss) | $ 263 | 216 | $ 541 | 122 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Towers Property Holdings, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 37.00% |  | 37.00% |  | 37.00%
Fair Value | $ 12,529 |  | $ 12,529 |  | $ 12,119
Change in fair value, gain (loss) | $ 361 | 284 | $ 740 | 122 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Mansions Property Holdings, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 34.00% |  | 34.00% |  | 34.00%
Fair Value | $ 12,073 |  | $ 12,073 |  | $ 11,679
Change in fair value, gain (loss) | $ 348 | 273 | $ 713 | 118 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Sabina Montgomery Holdings, LLC - Series B and Oakley Shoals Apartments, LLC - Series A (collectively) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 43.00% |  | 43.00% |  | 43.00%
Fair Value | $ 4,446 |  | $ 4,446 |  | $ 4,320
Change in fair value, gain (loss) | $ 131 | 107 | $ 266 | 53 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Gen1814, LLC - Series A, Highlands - Mtg. Holdings, LLC - Series A, and Polos at Hudson Investments, LLC - Series A (collectively) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 37.00% |  | 37.00% |  | 37.00%
Fair Value | $ 10,256 |  | $ 10,256 |  | $ 9,966
Change in fair value, gain (loss) | $ 302 | 245 | $ 616 | 114 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | 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) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 53.00% |  | 53.00% |  | 53.00%
Fair Value | $ 12,679 |  | $ 12,679 |  | $ 12,337
Change in fair value, gain (loss) | $ 374 | 304 | $ 762 | 135 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | DCP Gold Creek, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 44.00% |  | 44.00% |  | 44.00%
Fair Value | $ 6,546 |  | $ 6,546 |  | $ 6,357
Change in fair value, gain (loss) | $ 197 | 222 | $ 400 | 102 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | 1122 Chicago DE, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 53.00% |  | 53.00% |  | 53.00%
Fair Value | $ 7,465 |  | $ 7,465 |  | $ 7,222
Change in fair value, gain (loss) | $ 225 | 296 | $ 446 | 236 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Rigsbee Ave Holdings, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 56.00% |  | 56.00% |  | 56.00%
Fair Value | $ 11,150 |  | $ 11,150 |  | $ 10,222
Change in fair value, gain (loss) | $ 896 | 425 | $ 1,215 | 279 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Bighaus, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 42.00% |  | 42.00% |  | 42.00%
Fair Value | $ 14,984 |  | $ 14,984 |  | $ 14,525
Change in fair value, gain (loss) | $ 443 | 0 | $ 879 | 0 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | FF/RMI 20 Midtown, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 51.00% |  | 51.00% |  | 51.00%
Fair Value | $ 24,649 |  | $ 24,649 |  | $ 23,936
Change in fair value, gain (loss) | $ 758 | 0 | $ 1,504 | 0 |
Investment in unconsolidated entities | Multi-Family Preferred Equity Ownership Interests | Lurin-RMI, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 38.00% |  | 38.00% |  | 38.00%
Fair Value | $ 7,446 |  | $ 7,446 |  | $ 7,216
Change in fair value, gain (loss) | 235 | 0 | 470 | 0 |
Investment in unconsolidated entities | Single-Family Equity Ownership Interests |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Fair Value | 14,951 |  | 14,951 |  | $ 76,330
Change in fair value, gain (loss) | $ 4,271 | 1,398 | $ 2,171 | 2,616 |
Investment in unconsolidated entities | Single-Family Equity Ownership Interests | Morrocroft Neighborhood Stabilization Fund II, LP |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 11.00% |  | 11.00% |  | 11.00%
Fair Value | $ 14,951 |  | $ 14,951 |  | $ 13,040
Investment in unconsolidated entities | Single-Family Equity Ownership Interests | Headlands Asset Management Fund III (Cayman), LP (Headlands Flagship Opportunity Fund Series I) (1) |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership Interest | 0.00% |  | 0.00% |  | 49.00%
Fair Value | $ 0 |  | $ 0 |  | $ 63,290
Investment in unconsolidated entities | Preferred Equity Ownership Interests |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Fair Value | 204,697 |  | 204,697 |  | $ 259,095
Investment in unconsolidated entities | Joint Venture Equity Investments In Multi-family Properties |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Gain (loss) from equity investments |  | (1,300) |  | (1,100) |
Change in fair value, gain (loss) | 0 | (1,310) | 0 | (1,071) |
Investment in unconsolidated entities | Joint Venture Equity Investments In Multi-family Properties | The Preserve at Port Royal Venture, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Change in fair value, gain (loss) | $ 0 | $ (1,310) | $ 0 | $ (1,071) |

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