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Investments in Joint Ventures as of December 31, 2021 (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | $ 472,317 | $ 451,767 |
Cash and cash equivalents | 2,987 | 21,649 |
Unrealized rents & receivables | 4,342 | 1,102 |
Deferred costs | 898 | 4,038 |
Total Assets | 678,190 | 536,360 | $ 538,148
Secured notes payable | 222,635 | 180,890 |
Other liabilities | 28,253 | 34,126 |
Capital - Third Parties | 396,423 | 367,654 |
Total Liabilities and Capital | 678,190 | 536,360 |
Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 480,544 | 478,556 |
Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 139,981 | 174,792 |
Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - Third Parties | 89,675 | 88,748 |
Real Estate Partnership Total Liabilities And Capital [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Liabilities and Capital | 480,544 | 478,556 |
Brooksville Quarry L L C [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | 14,281 | 14,287 |
Cash and cash equivalents | 18 | 55 |
Unrealized rents & receivables | 0 | 0 |
Deferred costs | 2 | 5 |
Secured notes payable | 0 | 0 |
Other liabilities | 0 | 28 |
Brooksville Quarry L L C [Member] | Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 14,301 | 14,347 |
Brooksville Quarry L L C [Member] | Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 7,488 | 7,499 |
Brooksville Quarry L L C [Member] | Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - Third Parties | 6,813 | 6,820 |
Brooksville Quarry L L C [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Liabilities and Capital | 14,301 | 14,347 |
B C F R P Realty L L C [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | 21,561 | 22,067 |
Cash and cash equivalents | 312 | 90 |
Unrealized rents & receivables | 368 | 254 |
Deferred costs | 229 | 336 |
Secured notes payable | 11,384 | 12,370 |
Other liabilities | 140 | 123 |
B C F R P Realty L L C [Member] | Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 22,470 | 22,747 |
B C F R P Realty L L C [Member] | Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 5,473 | 5,127 |
B C F R P Realty L L C [Member] | Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - Third Parties | 5,473 | 5,127 |
B C F R P Realty L L C [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Liabilities and Capital | 22,470 | 22,747 |
Aberdeen Station [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | 514 |  |
Cash and cash equivalents | 0 |  |
Unrealized rents & receivables | 0 |  |
Deferred costs | 0 |  |
Secured notes payable | 0 |  |
Other liabilities | 0 |  |
Aberdeen Station [Member] | Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 514 |  |
Aberdeen Station [Member] | Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 514 |  |
Aberdeen Station [Member] | Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - Third Parties | 0 |  |
Aberdeen Station [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Liabilities and Capital | 514 |  |
Amber Ridge Loan [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | 11,466 | 10,026 |
Cash and cash equivalents | 0 | 0 |
Unrealized rents & receivables | 0 | 0 |
Deferred costs | 0 | 0 |
Secured notes payable | 0 | 0 |
Other liabilities | 0 | 0 |
Amber Ridge Loan [Member] | Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 11,466 | 10,026 |
Amber Ridge Loan [Member] | Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 11,466 | 10,026 |
Amber Ridge Loan [Member] | Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - Third Parties | 0 | 0 |
Amber Ridge Loan [Member] | Real Estate Partnership Total Liabilities And Capital [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Liabilities and Capital | 11,466 | 10,026 |
Apartment Mixed Use [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in real estate, net | 424,495 | 404,796 |
Cash and cash equivalents | 2,657 | 21,504 |
Unrealized rents & receivables | 3,974 | 848 |
Deferred costs | 667 | 3,697 |
Secured notes payable | 211,251 | 168,520 |
Other liabilities | 28,113 | 33,975 |
Apartment Mixed Use [Member] | Real Estate Total Assets [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total Assets | 431,793 | 430,845 |
Apartment Mixed Use [Member] | Real Estate Partnership F R P [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - FRP | 115,040 | 151,549 |
Apartment Mixed Use [Member] | Real Estate Partnership Third Parties [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Capital - Third Parties | 77,389 | 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 | $ 431,793 | $ 430,845 |

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