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Segments (Capital Expenditures) (Detail) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract]        
Acquisition of retail properties       $ 2,908,176
Acquisition of operating properties, net $ 9,694,785 $ 7,768,755 $ 23,667,535 67,852,592
Capital expenditures and tenant improvements 1,819,591 2,331,329 4,150,213 2,854,939
Total real estate investments 11,514,376 10,100,084 27,817,748 70,707,531
Office/Industrial Properties [Member]        
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract]        
Acquisition of operating properties, net       59,223,876
Capital expenditures and tenant improvements 1,783,814 2,309,976 4,092,875 2,800,100
Residential Properties [Member]        
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract]        
Acquisition of operating properties, net 9,694,785 7,768,755 23,667,535 5,720,540
Retail Properties [Member]        
Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Abstract]        
Capital expenditures and tenant improvements $ 35,777 $ 21,353 $ 57,338 $ 54,839