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Organization and Background	3 Months Ended
Organization and Background	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Background	Organization and Background BRT Apartments Corp. (the "Company"), a Maryland corporation, owns, operates and develops multi-family properties. The Company conducts its operations to qualify as a real estate investment trust, or REIT, for federal income tax purposes. Generally, the multi-family properties are acquired with joint venture partners in transactions in which the Company contributes a significant portion of the equity. At December 31, 2018, the Company owns: (a) 35 multi-family properties with 9,696 units (including 402 units at a property under development), located in 11 states with a carrying value of $1,018,874,000; and (b) interests in three unconsolidated multi-family joint ventures with 687 units (including 339 units in lease-up) located in two states with a carrying value of $19,635,000.