Investment in Unconsolidated Ventures - Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
ASSETS
Real estate properties, net of accumulated depreciation of $85,591 and $81,843	$ 611,519	$ 615,915
Cash and cash equivalents	24,366	27,856	$ 21,252
Other assets	16,499	17,460
Total Assets	703,913	713,463
Liabilities:
Mortgages payable, net of deferred costs of $763 and $837	445,711	446,471
Accounts payable and accrued liabilities	22,645	24,915
Total Liabilities	505,524	508,549
Commitments and contingencies
Equity:
Total unconsolidated joint venture equity	198,389	204,914	$ 220,614	$ 228,445
Total Liabilities and Equity	703,913	713,463
Real estate accumulated depreciation	112,966	106,425
Deferred costs	3,998	4,247
Unconsolidated Joint Ventures
ASSETS
Real estate properties, net of accumulated depreciation of $85,591 and $81,843	315,771	318,594
Cash and cash equivalents	5,531	5,549
Other assets	6,626	5,567
Total Assets	327,928	329,710
Liabilities:
Mortgages payable, net of deferred costs of $763 and $837	250,358	251,112
Accounts payable and accrued liabilities	5,502	5,148
Total Liabilities	255,860	256,260
Commitments and contingencies
Equity:
Total unconsolidated joint venture equity	72,068	73,450
Total Liabilities and Equity	327,928	329,710
BRT's interest in joint venture equity	30,834	31,344
Real estate accumulated depreciation	85,591	81,843
Unconsolidated Joint Ventures | Mortgages payable
Equity:
Deferred costs	$ 763	$ 837