Investment in Unconsolidated Ventures - Income Statement Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues:
Rental and other revenue	$ 14,683,000	$ 6,958,000	$ 26,113,000	$ 14,053,000
Total revenues	14,685,000	6,961,000	26,119,000	14,060,000
Expenses:
Real estate operating expenses	6,348,000	3,166,000	11,101,000	6,283,000
Interest expense	2,912,000	1,609,000	4,933,000	3,269,000
Depreciation	5,010,000	1,416,000	8,616,000	2,953,000
Total expenses	17,803,000	9,865,000	31,816,000	19,293,000
Total revenues less total expenses	(3,118,000)	(2,904,000)	(5,697,000)	(5,233,000)
Impairment of assets	0	(520,000)	0	(520,000)
Gain on sale of real estate	0	7,279,000	6,000	7,279,000
Loss on extinguishment of debt	(563,000)	0	(563,000)	0
BRT's equity in (loss) earnings and equity in earnings from sale of unconsolidated joint venture properties	35,607,000	6,027,000	47,115,000	2,262,000
Unconsolidated Joint Ventures
Revenues:
Rental and other revenue	22,107,000	33,005,000	47,338,000	65,677,000
Total revenues	22,107,000	33,005,000	47,338,000	65,677,000
Expenses:
Real estate operating expenses	9,842,000	15,233,000	21,011,000	30,936,000
Interest expense	4,893,000	8,472,000	10,919,000	16,994,000
Depreciation	5,208,000	9,791,000	11,844,000	20,176,000
Total expenses	19,943,000	33,496,000	43,774,000	68,106,000
Total revenues less total expenses	2,164,000	(491,000)	3,564,000	(2,429,000)
Other equity earnings	22,000	5,000	77,000	14,000
Impairment of assets	0	(490,000)	0	(2,813,000)
Insurance recoveries	0	490,000	0	2,813,000
Gain on insurance recoveries	52,000	0	567,000	0
Gain on sale of real estate	77,681,000	0	101,333,000	0
Loss on extinguishment of debt	(2,888,000)	0	(2,918,000)	0
Net income (loss) from joint ventures	77,031,000	(486,000)	102,623,000	(2,415,000)
BRT's equity in (loss) earnings and equity in earnings from sale of unconsolidated joint venture properties	$ 40,048,000	$ (492,000)	$ 54,239,000	$ (1,837,000)