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Organization and Background	9 Months Ended
Organization and Background	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Background	Organization and Background BRT Realty Trust (“BRT” or the “Trust”) is a business trust organized in Massachusetts. BRT owns, operates and develops multi‑family properties and owns and operates other assets, including real estate and a real estate loan. Generally, the multi‑family properties are acquired with venture partners in transactions in which the Trust contributes 65% to 80% of the equity. At June 30, 2016, the Trust owns 31 multi-family properties with 8,973 units located in 11 states (including 271 units at a property under construction and 350 units at a property in the lease up stage). At June 30, 2016, the net book value of the multi family assets (including real estate asset held for sale) was $685,537,000. The Trust also owns and operates various other real estate assets. At June 30, 2016, the net book value of the real property included in these other real estate assets was $29,968,000, including a real estate loan of $19,500,000. BRT conducts its operations to qualify as a real estate investment trust, or REIT, for federal income tax purposes.