Variable Interest Entity (Schedules) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Property	$ 81,777	$ 80,564
Accumulated depreciation	(1,492)	(150)
Total real estate assets	80,285	80,414
Cash and cash equivalents	2,184	1,243
Escrows and acquisition deposits	1,442	2,274
Accrued rents and accounts receivable, net of allowance for doubtful accounts	487	213
Receivable due from related party	1,769	2,818
Unamortized lease commissions and deferred legal costs, net	1,117	1,150
Prepaid expenses and other assets	269	149
Total assets	87,553	88,261
Notes payable	64,900	65,474
Accounts payable and accrued expenses	2,568	3,509
Payable due to related party	785	265
Tenants' security deposits	1,074	996
Total liabilities	69,557	70,464
Pillarstone Variable Interest Entity [Member]
Schedule of Equity Method Investments [Line Items]
Property	81,777	80,564
Accumulated depreciation	(1,492)	(150)
Total real estate assets	80,285	80,414
Cash and cash equivalents	2,088	1,236
Escrows and acquisition deposits	1,442	2,274
Accrued rents and accounts receivable, net of allowance for doubtful accounts	487	213
Receivable due from related party	1,769	2,818
Unamortized lease commissions and deferred legal costs, net	1,117	1,150
Prepaid expenses and other assets	265	134
Total assets	87,453	88,239
Notes payable	64,900	65,474
Accounts payable and accrued expenses	2,550	3,481
Payable due to related party	785	265
Tenants' security deposits	1,074	996
Total liabilities	69,309	70,216
Accounts receivable related party	$ 300	$ 300