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Investments in Apartment/Mixed-use as of December 31, 2022 (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Investments in real estate, net | $ 498,119 | $ 493,324
Cash and cash equivalents | 8,814 | 7,937
Unrealized rents & receivables | 6,990 | 5,577
Deferred costs | 5,838 | 3,802
Total Assets | 701,157 | 701,084
Secured notes payable | 273,938 | 276,801
Other liabilities | 6,635 | 11,023
Capital – Third Parties | 410,790 | 407,145
Total Liabilities and Capital | 701,157 | 701,084
Real Estate Total Assets [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Assets | 519,761 | 510,640
Real Estate Partnership F R P [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital - FRP | 148,740 | 135,333
Real Estate Partnership Third Parties [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital – Third Parties | 90,448 | 87,483
Real Estate Partnership Total Liabilities And Capital [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Liabilities and Capital | 519,761 | 510,640
Buzzard Point Sponsor Partnership [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in real estate, net | 0 | 0
Cash and cash equivalents | 0 | 0
Unrealized rents & receivables | 0 | 0
Deferred costs | 4,584 | 2,906
Secured notes payable | 0 | 0
Other liabilities | 0 | 0
Buzzard Point Sponsor Partnership [Member] | Real Estate Total Assets [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Assets | 4,584 | 2,906
Buzzard Point Sponsor Partnership [Member] | Real Estate Partnership F R P [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital - FRP | 2,292 | 1,453
Buzzard Point Sponsor Partnership [Member] | Real Estate Partnership Third Parties [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital – Third Parties | 2,292 | 1,453
Buzzard Point Sponsor Partnership [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Liabilities and Capital | 4,584 | 2,906
Bryant Street Partnerships [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in real estate, net | 187,693 | 192,904
Cash and cash equivalents | 1,661 | 1,349
Unrealized rents & receivables | 6,141 | 5,128
Deferred costs | 420 | 393
Secured notes payable | 116,922 | 129,263
Other liabilities | 2,786 | 2,338
Bryant Street Partnerships [Member] | Real Estate Total Assets [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Assets | 195,915 | 199,774
Bryant Street Partnerships [Member] | Real Estate Partnership F R P [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital - FRP | 59,132 | 53,553
Bryant Street Partnerships [Member] | Real Estate Partnership Third Parties [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital – Third Parties | 17,075 | 14,620
Bryant Street Partnerships [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Liabilities and Capital | 195,915 | 199,774
Estero Partnership [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in real estate, net | 34,416 | 33,008
Cash and cash equivalents | 4,287 | 5,497
Unrealized rents & receivables | 0 | 0
Deferred costs | 0 | 0
Secured notes payable | 16,000 | 16,000
Other liabilities | 174 | 5
Estero Partnership [Member] | Real Estate Total Assets [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Assets | 38,703 | 38,505
Estero Partnership [Member] | Real Estate Partnership F R P [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital - FRP | 3,605 | 3,600
Estero Partnership [Member] | Real Estate Partnership Third Parties [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital – Third Parties | 18,924 | 18,900
Estero Partnership [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Liabilities and Capital | 38,703 | 38,505
Verge [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in real estate, net | 129,145 | 130,616
Cash and cash equivalents | 1,170 | 359
Unrealized rents & receivables | 309 | 14
Deferred costs | 354 | 139
Secured notes payable | 72,402 | 66,584
Other liabilities | 1,102 | 5,328
Verge [Member] | Real Estate Total Assets [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Assets | 130,978 | 131,128
Verge [Member] | Real Estate Partnership F R P [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital - FRP | 35,261 | 36,348
Verge [Member] | Real Estate Partnership Third Parties [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital – Third Parties | 22,213 | 22,868
Verge [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Liabilities and Capital | 130,978 | 131,128
Greenville Partnerships [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in real estate, net | 96,834 | 95,883
Cash and cash equivalents | 1,595 | 567
Unrealized rents & receivables | 83 | 13
Deferred costs | 105 | 88
Secured notes payable | 67,414 | 64,954
Other liabilities | 2,243 | 3,014
Greenville Partnerships [Member] | Real Estate Total Assets [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Assets | 98,617 | 96,551
Greenville Partnerships [Member] | Real Estate Partnership F R P [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital - FRP | 10,858 | 11,087
Greenville Partnerships [Member] | Real Estate Partnership Third Parties [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital – Third Parties | 18,102 | 17,496
Greenville Partnerships [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Liabilities and Capital | 98,617 | 96,551
Apartment Mixed Use [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in real estate, net | 448,088 | 452,411
Cash and cash equivalents | 8,713 | 7,772
Unrealized rents & receivables | 6,533 | 5,155
Deferred costs | 5,463 | 3,526
Secured notes payable | 272,738 | 276,801
Other liabilities | 6,305 | 10,685
Apartment Mixed Use [Member] | Real Estate Total Assets [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Assets | 468,797 | 468,864
Apartment Mixed Use [Member] | Real Estate Partnership F R P [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital - FRP | 111,148 | 106,041
Apartment Mixed Use [Member] | Real Estate Partnership Third Parties [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Capital – Third Parties | 78,606 | 75,337
Apartment Mixed Use [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |
Schedule of Equity Method Investments [Line Items] |  |
Total Liabilities and Capital | $ 468,797 | $ 468,864

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