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Investment in Real Estate - Real Estate Held For Sale (Details)
 3 Months Ended 9 Months Ended
Mar. 31, 2017
property
Sep. 30, 2017
USD ($)
Sep. 14, 2017
USD ($)
Dec. 31, 2016
USD ($)
property
ASSETS        
Investment in real estate, net   $ 302,992,000   $ 371,422,000
Accounts receivable, net   11,000   357,000
Straight-line rent receivables, net   5,220,000   5,949,000
Deferred leasing costs and lease intangible assets, net   13,204,000   17,798,000
Prepaid expenses and other assets, net   10,000   959,000
Assets associated with real estate held for sale   321,437,000   396,485,000
LIABILITIES        
Notes payable, net   214,818,000   214,687,000
Accounts payable and accrued liabilities   3,229,000   6,517,000
Lease intangible liabilities, net   5,316,000   6,588,000
Security deposits and prepaid rent   669,000   2,643,000
Liabilities associated with real estate held for sale   224,032,000   $ 230,435,000
Real Estate [Line Items]        
Number of properties held for sale | property       4
Number of properties sold during the period | property 2      
Long-lived asset impairment charges   0    
Not Discontinued Operations        
Real Estate [Line Items]        
Principal Amount of debt included in held-for-sale balances   $ 216,000,000   $ 216,000,000
Joint Venture That Owns Pinnacle I and II | Not Discontinued Operations        
Real Estate [Line Items]        
Disposal group, consideration     $ 350,000,000  
Principal Amount of debt included in held-for-sale balances     $ 216,000,000