Quarterly report pursuant to Section 13 or 15(d)

Real Estate - Schedule of Acquisitions (Details)

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Real Estate - Schedule of Acquisitions (Details) - Arlington Tower [Member]
$ in Thousands
Mar. 31, 2018
USD ($)
ft²
Real Estate [Line Items]  
Net Rentable Square Feet | ft² 396,000
Contract Purchase Price | $ $ 250,000