Investment in Unconsolidated Ventures - Income Statement Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenues:
Rental and other revenue	$ 21,691,000	$ 7,709,000	$ 47,804,000	$ 21,762,000
Total revenues	21,697,000	7,714,000	47,816,000	21,774,000
Expenses:
Real estate operating expenses	9,195,000	3,404,000	20,296,000	9,687,000
Interest expense	5,061,000	1,535,000	9,994,000	4,804,000
Depreciation	8,165,000	1,787,000	16,781,000	4,740,000
Total expenses	26,094,000	9,840,000	57,910,000	29,133,000
Total revenues less total expenses	(4,397,000)	(2,126,000)	(10,094,000)	(7,359,000)
Impairment of assets	0	0	0	(520,000)
Gain on sale of real estate	0	414,000	6,000	7,693,000
Loss on extinguishment of debt	0	(902,000)	(563,000)	(902,000)
BRT's equity in (loss) earnings and equity in earnings from sale of unconsolidated joint venture properties	7,059,000	28,106,000	54,174,000	30,368,000
Unconsolidated Joint Ventures
Revenues:
Rental and other revenue	13,502,000	29,818,000	60,840,000	95,495,000
Total revenues	13,502,000	29,818,000	60,840,000	95,495,000
Expenses:
Real estate operating expenses	6,512,000	14,587,000	27,523,000	45,523,000
Interest expense	2,843,000	7,568,000	13,762,000	24,562,000
Depreciation	3,113,000	8,288,000	14,957,000	28,464,000
Total expenses	12,468,000	30,443,000	56,242,000	98,549,000
Total revenues less total expenses	1,034,000	(625,000)	4,598,000	(3,054,000)
Other equity earnings	12,000	7,000	89,000	21,000
Impairment of assets	0	0	0	(2,813,000)
Insurance recoveries	0	0	0	2,813,000
Gain on insurance recoveries	0	1,246,000	567,000	1,246,000
Gain on sale of real estate	16,937,000	83,984,000	118,270,000	83,984,000
Loss on extinguishment of debt	(573,000)	(9,401,000)	(3,491,000)	(9,401,000)
Net income from joint ventures	17,410,000	75,211,000	120,033,000	72,796,000
BRT's equity in (loss) earnings and equity in earnings from sale of unconsolidated joint venture properties	$ 11,607,000	$ 30,786,000	$ 65,846,000	$ 28,949,000