Investment in Unconsolidated Ventures - Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
ASSETS
Real estate properties, net of accumulated depreciation of $75,768 and $69,970	$ 626,291		$ 635,836
Cash and cash equivalents	18,946		23,512	$ 31,336
Other assets	16,730		15,741
Total Assets	694,713		709,963
Liabilities:
Mortgages payable, net of deferred costs of $986 and $1,135	421,250		422,427
Accounts payable and accrued liabilities	21,636		21,948
Total Liabilities	480,039		481,518
Commitments and contingencies
Equity:
Total unconsolidated joint venture equity	214,674	$ 220,614	228,445	$ 245,746	$ 243,334	$ 250,070
Total Liabilities and Equity	694,713		709,963
Real estate accumulated depreciation	93,400		80,499
Deferred costs	3,831		4,266
Asset under Construction
ASSETS
Real estate properties, net of accumulated depreciation of $75,768 and $69,970			46,508
Unconsolidated Joint Ventures
ASSETS
Real estate properties, net of accumulated depreciation of $75,768 and $69,970	324,214		275,874
Cash and cash equivalents	5,374		6,447
Other assets	7,418		54,715
Total Assets	337,006		337,036
Liabilities:
Mortgages payable, net of deferred costs of $986 and $1,135	250,584		246,966
Accounts payable and accrued liabilities	10,657		8,751
Total Liabilities	261,241		255,717
Commitments and contingencies
Equity:
Total unconsolidated joint venture equity	75,765		81,319
Total Liabilities and Equity	337,006		337,036
BRT's interest in joint venture equity	32,178		34,242
Real estate accumulated depreciation	75,768		69,970
Mortgages payable | Unconsolidated Joint Ventures
Equity:
Deferred costs	$ 986		$ 1,135