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Investment in Unconsolidated Joint Venture - Narrative (Details)
2 Months Ended 12 Months Ended
Nov. 10, 2017
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
apartment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Schedule of Equity Method Investments [Line Items]          
Number of units in real estate property (in number of units or apartments) | apartment     744    
Cash distributions from unconsolidated joint venture     $ 530,100 $ 0 $ 0
BREIT Steadfast MF JV LP [Member]          
Schedule of Equity Method Investments [Line Items]          
Noncash or Part Noncash Acquisition, Interest Acquired 10.00%        
Book value of joint venture   $ 8,133,156 14,085,399 8,133,156  
Outside difference   5,515,754 7,640,166 5,515,754  
Amortization of the basis difference   $ 106,519 $ 594,886 $ 106,519  
BREIT LP [Member] | BREIT Steadfast MF JV LP [Member]          
Schedule of Equity Method Investments [Line Items]          
Noncash or Part Noncash Acquisition, Interest Acquired 90.00%