Investment in Unconsolidated Ventures - Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
ASSETS
Real estate properties, net of accumulated depreciation of $125,930 and $133,615	$ 328,334	$ 293,550
Cash and cash equivalents	29,688	32,339	$ 19,406
Other assets	12,410	10,341
Total Assets	483,000	459,538
Liabilities:
Mortgages payable, net of deferred costs of $3,244 and $3,423	211,565	199,877
Accounts payable and accrued liabilities	20,125	19,607
Total Liabilities	268,798	256,587
Commitments and contingencies
Equity:
Total unconsolidated joint venture equity	214,171	202,956
Total Liabilities and Equity	483,000	459,538
Deferred mortgage costs	1,589	1,277
Mortgages payable
Equity:
Deferred mortgage costs	1,297	980
Unconsolidated Joint Ventures
ASSETS
Real estate properties, net of accumulated depreciation of $125,930 and $133,615	675,246	734,247
Cash and cash equivalents	11,567	13,741
Other assets	25,944	25,535
Total Assets	712,757	773,523
Liabilities:
Mortgages payable, net of deferred costs of $3,244 and $3,423	531,246	584,479
Accounts payable and accrued liabilities	10,266	17,064
Total Liabilities	541,512	601,543
Commitments and contingencies
Equity:
Total unconsolidated joint venture equity	171,245	171,980
Total Liabilities and Equity	712,757	773,523
BRT's interest in joint venture equity	106,025	112,347
Real estate properties, net of accumulated depreciation	125,930	133,615
Unconsolidated Joint Ventures | Mortgages payable
Equity:
Deferred mortgage costs	$ 3,244	$ 3,423