Investment in Unconsolidated Ventures - Income Statement Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenues:
Rental and other revenue	$ 11,430,000	$ 7,095,000
Total revenues	11,434,000	7,099,000
Expenses:
Real estate operating expenses	4,753,000	3,117,000
Interest expense	2,021,000	1,660,000
Depreciation and amortization	3,606,000	1,537,000
Total expenses	14,013,000	9,428,000
Total revenues less total expenses	(2,579,000)	(2,329,000)
Impairment of assets	0	0
Gain on sale of real estate	6,000	0
BRT's equity in earnings (loss) and equity in earnings from sale of unconsolidated joint venture properties	11,508,000	(3,765,000)
Unconsolidated Joint Ventures
Revenues:
Rental and other revenue	25,231,000	32,672,000
Total revenues	25,231,000	32,672,000
Expenses:
Real estate operating expenses	11,169,000	15,703,000
Interest expense	6,026,000	8,522,000
Depreciation and amortization	6,636,000	10,385,000
Total expenses	23,831,000	34,610,000
Total revenues less total expenses	1,400,000	(1,938,000)
Other equity earnings	55,000	9,000
Impairment of assets	0	(2,323,000)
Insurance recoveries	0	2,323,000
Gain on insurance recoveries	515,000	0
Gain on sale of real estate	23,652,000	0
Loss on extinguishment of debt	(30,000)	0
Net income (loss) from joint ventures	25,592,000	(1,929,000)
BRT's equity in earnings (loss) and equity in earnings from sale of unconsolidated joint venture properties	$ 14,191,000	$ (1,345,000)