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Segments (Capital Expenditures) (Detail) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 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 $ 16,810,985 $ 15,774,855 $ 23,667,535 67,852,592
Capital expenditures and tenant improvements 3,156,986 3,713,626 4,150,213 2,854,939
Total real estate investments 19,967,971 19,488,481 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 3,115,489 3,629,586 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 16,810,985 15,774,855 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 $ 41,497 $ 84,040 $ 57,338 $ 54,839