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Investments in Apartment/Mixed Use Joint Ventures as of September 30, 2021 (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in real estate, net | $ 444,485 |  |  | $ 451,767
Cash and cash equivalents | 2,752 |  |  | 21,649
Unrealized rents & receivables | 3,374 |  |  | 1,102
Deferred costs | 3,813 |  |  | 4,038
Total Assets | 678,753 |  |  | 536,360
Secured notes payable | 193,433 |  |  | 180,890
Other liabilities | 29,137 |  |  | 34,126
Capital – Third Parties | 396,990 |  |  | 367,654
Total Liabilities and Capital | 678,753 |  |  | 536,360
Real Estate Total Assets [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Assets | 454,424 |  |  | 478,556
Real Estate Partnership F R P [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital - FRP | 141,147 |  |  | 174,792
Real Estate Partnership Third Parties [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital – Third Parties | 90,707 |  |  | 88,748
Real Estate Partnership Total Liabilities And Capital [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Liabilities and Capital | 454,424 |  |  | 478,556
Riverfront Holdings I I L L C [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in real estate, net | 0 |  |  | 105,737
Cash and cash equivalents | 0 |  |  | 2,626
Unrealized rents & receivables | 0 |  |  | 13
Deferred costs | 0 |  |  | 162
Total Assets |  |  | $ 150,082 |
Secured notes payable | 0 |  |  | 64,982
Other liabilities | 0 |  |  | 4,189
Capital - FRP |  |  | 18,513 |
Capital – Third Parties |  |  | 44,200 |
Total Liabilities and Capital |  |  | $ 150,082 |
Riverfront Holdings I I L L C [Member] | Real Estate Total Assets [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Assets | 0 | [1] |  | 108,538
Riverfront Holdings I I L L C [Member] | Real Estate Partnership F R P [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital - FRP | 0 |  |  | 34,667
Riverfront Holdings I I L L C [Member] | Real Estate Partnership Third Parties [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital – Third Parties | 0 |  |  | 4,700
Riverfront Holdings I I L L C [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Liabilities and Capital | 0 |  |  | 108,538
Bryant Street Partnerships [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in real estate, net | 198,039 |  |  | 173,560
Cash and cash equivalents | 848 |  |  | 111
Unrealized rents & receivables | 1,892 |  |  | 58
Deferred costs | 365 |  |  | 85
Secured notes payable | 116,705 |  |  | 72,471
Other liabilities | 7,620 |  |  | 22,952
Bryant Street Partnerships [Member] | Real Estate Total Assets [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Assets | 201,144 |  |  | 173,814
Bryant Street Partnerships [Member] | Real Estate Partnership F R P [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital - FRP | 58,014 |  |  | 58,559
Bryant Street Partnerships [Member] | Real Estate Partnership Third Parties [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital – Third Parties | 18,805 |  |  | 19,832
Bryant Street Partnerships [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Liabilities and Capital | 201,144 |  |  | 173,814
D S T Hickory Creek [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in real estate, net | 44,224 |  |  | 45,379
Cash and cash equivalents | 978 |  |  | 1,202
Unrealized rents & receivables | 1,004 |  |  | 775
Deferred costs | 354 |  |  | 405
Secured notes payable | 29,325 |  |  | 29,291
Other liabilities | 162 |  |  | 107
D S T Hickory Creek [Member] | Real Estate Total Assets [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Assets | 46,560 |  |  | 47,761
D S T Hickory Creek [Member] | Real Estate Partnership F R P [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital - FRP | 4,550 |  |  | 4,894
D S T Hickory Creek [Member] | Real Estate Partnership Third Parties [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital – Third Parties | 12,523 |  |  | 13,469
D S T Hickory Creek [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Liabilities and Capital | 46,560 |  |  | 47,761
Half St Owner L L C [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in real estate, net | 73,580 |  |  | 37,452
Cash and cash equivalents | 439 |  |  | 14,011
Unrealized rents & receivables | 0 |  |  | 2
Deferred costs | 2,810 |  |  | 2,810
Secured notes payable | 0 |  |  | 0
Other liabilities | 15,766 |  |  | 1,953
Half St Owner L L C [Member] | Real Estate Total Assets [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Assets | 76,829 |  |  | 54,275
Half St Owner L L C [Member] | Real Estate Partnership F R P [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital - FRP | 37,483 |  |  | 37,466
Half St Owner L L C [Member] | Real Estate Partnership Third Parties [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital – Third Parties | 23,580 |  |  | 14,856
Half St Owner L L C [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Liabilities and Capital | 76,829 |  |  | 54,275
Greenville Woodfield Partnerships [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in real estate, net | 80,261 |  |  | 42,668
Cash and cash equivalents | 207 |  |  | 3,554
Unrealized rents & receivables | 8 |  |  | 0
Deferred costs | 0 |  |  | 235
Secured notes payable | 35,879 |  |  | 1,776
Other liabilities | 5,370 |  |  | 4,774
Greenville Woodfield Partnerships [Member] | Real Estate Total Assets [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Assets | 80,476 |  |  | 46,457
Greenville Woodfield Partnerships [Member] | Real Estate Partnership F R P [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital - FRP | 15,691 |  |  | 15,963
Greenville Woodfield Partnerships [Member] | Real Estate Partnership Third Parties [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital – Third Parties | 23,536 |  |  | 23,944
Greenville Woodfield Partnerships [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Liabilities and Capital | 80,476 |  |  | 46,457
Apartment Mixed Use [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Investments in real estate, net | 396,104 |  |  | 404,796
Cash and cash equivalents | 2,472 |  |  | 21,504
Unrealized rents & receivables | 2,904 |  |  | 848
Deferred costs | 3,529 |  |  | 3,697
Secured notes payable | 181,909 |  |  | 168,520
Other liabilities | 28,918 |  |  | 33,975
Apartment Mixed Use [Member] | Real Estate Total Assets [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Assets | 405,009 |  |  | 430,845
Apartment Mixed Use [Member] | Real Estate Partnership F R P [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital - FRP | 115,738 |  |  | 151,549
Apartment Mixed Use [Member] | Real Estate Partnership Third Parties [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Capital – Third Parties | 78,444 |  |  | 76,801
Apartment Mixed Use [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Total Liabilities and Capital | $ 405,009 |  |  | $ 430,845
[1] | Riverfront Holdings II, LLC was consolidated on March 31, 2021. Bryant Street Partnerships includes $674,000 in 2021 and $1,146,000 in 2020 for the Company’s share of preferred interest and $354,000 in 2021 and $471,000 in 2020 for amortization of guarantee liability related to the Bryant Street loan.

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