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Investments in Apartment/Mixed Use Joint Ventures as of June 30, 2022 (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | $ 492,952 | $ 472,317 |
Cash and cash equivalents | 4,924 | 2,987 |
Unrealized rents & receivables | 6,485 | 4,342 |
Deferred costs | 936 | 898 |
Total Assets | 677,040 | 678,190 |
Secured notes payable | 267,426 | 222,635 |
Other liabilities | 18,705 | 28,253 |
Capital – Third Parties | 397,802 | 396,423 |
Total Liabilities and Capital | 677,040 | 678,190 |
Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 505,297 | 480,544 |
Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 131,892 | 139,981 |
Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital – Third Parties | 87,274 | 89,675 |
Real Estate Partnership Total Liabilities And Capital [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Liabilities and Capital | 505,297 | 480,544 |
Riverfront Holdings I I L L C [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 | 0 | 0 |
Total Assets |  |  | $ 150,082
Secured notes payable | 0 | 0 |
Other liabilities | 0 | 0 |
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 | 0 |
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 | 0 |
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 | 0 |
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 | 0 |
Bryant Street Partnerships [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | 195,633 | 199,730 |
Cash and cash equivalents | 2,831 | 1,123 |
Unrealized rents & receivables | 4,859 | 2,925 |
Deferred costs | 157 | 304 |
Secured notes payable | 128,697 | 119,201 |
Other liabilities | 3,077 | 9,066 |
Bryant Street Partnerships [Member] | Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 203,480 | 204,082 |
Bryant Street Partnerships [Member] | Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 54,814 | 57,555 |
Bryant Street Partnerships [Member] | Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital – Third Parties | 16,892 | 18,260 |
Bryant Street Partnerships [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Liabilities and Capital | 203,480 | 204,082 |
D S T Hickory Creek [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | 43,124 | 43,840 |
Cash and cash equivalents | 579 | 827 |
Unrealized rents & receivables | 1,181 | 1,044 |
Deferred costs | 302 | 337 |
Secured notes payable | 29,360 | 29,337 |
Other liabilities | 144 | 115 |
D S T Hickory Creek [Member] | Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 45,186 | 46,048 |
D S T Hickory Creek [Member] | Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 4,179 | 4,423 |
D S T Hickory Creek [Member] | Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital – Third Parties | 11,503 | 12,173 |
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 | 45,186 | 46,048 |
Half St Owner L L C [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | 119,311 | 93,504 |
Cash and cash equivalents | 646 | 428 |
Unrealized rents & receivables | 0 | 0 |
Deferred costs | 0 | 0 |
Secured notes payable | 47,128 | 18,404 |
Other liabilities | 11,876 | 14,470 |
Half St Owner L L C [Member] | Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 119,957 | 93,932 |
Half St Owner L L C [Member] | Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 37,414 | 37,478 |
Half St Owner L L C [Member] | Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital – Third Parties | 23,539 | 23,580 |
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 | 119,957 | 93,932 |
Greenville Woodfield Partnerships [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | 92,149 | 87,421 |
Cash and cash equivalents | 466 | 279 |
Unrealized rents & receivables | 14 | 5 |
Deferred costs | 318 | 26 |
Secured notes payable | 51,148 | 44,309 |
Other liabilities | 3,402 | 4,462 |
Greenville Woodfield Partnerships [Member] | Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 92,947 | 87,731 |
Greenville Woodfield Partnerships [Member] | Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 15,359 | 15,584 |
Greenville Woodfield Partnerships [Member] | Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital – Third Parties | 23,038 | 23,376 |
Greenville Woodfield Partnerships [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Liabilities and Capital | 92,947 | 87,731 |
Apartment Mixed Use [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | 450,217 | 424,495 |
Cash and cash equivalents | 4,522 | 2,657 |
Unrealized rents & receivables | 6,054 | 3,974 |
Deferred costs | 777 | 667 |
Secured notes payable | 256,333 | 211,251 |
Other liabilities | 18,499 | 28,113 |
Apartment Mixed Use [Member] | Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 461,570 | 431,793 |
Apartment Mixed Use [Member] | Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 111,766 | 115,040 |
Apartment Mixed Use [Member] | Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital – Third Parties | 74,972 | 77,389 |
Apartment Mixed Use [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Liabilities and Capital | $ 461,570 | $ 431,793 |

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