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Investments in Real Estate - Investments in Existing Properties (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Investments in Real Estate    
Capitalized costs on existing properties $ 9,500,000 $ 5,300,000
Re-leasing costs 1,200,000 564,000
Recurring capital expenditures 536,000 486,000
Nonrecurring capital expenditures $ 7,800,000 $ 4,200,000