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Real Estate Assets (Properties) (Details)
12 Months Ended
Dec. 31, 2018
ft²
Property
Oct. 31, 2017
Property
Real Estate And Accumulated Depreciation [Line Items]    
Number of properties   1
Industrial Properties [Member]    
Real Estate And Accumulated Depreciation [Line Items]    
Number of properties 1  
Single Family Homes [Member]    
Real Estate And Accumulated Depreciation [Line Items]    
Term of non-cancelable lease agreements 18 months  
Term of option to extend lease agreements 6 months  
Description for option to extend lease agreements six month increments  
Office Properties [Member]    
Real Estate And Accumulated Depreciation [Line Items]    
Number of properties 14  
Office/Industrial Properties [Member]    
Real Estate And Accumulated Depreciation [Line Items]    
Rentable square feet | ft² 1,300,653  
Retail Properties [Member]    
Real Estate And Accumulated Depreciation [Line Items]    
Number of properties 4  
Rentable square feet | ft² 131,010  
Residential Properties [Member]    
Real Estate And Accumulated Depreciation [Line Items]    
Number of properties 144  
Number of Limited Liability Companies 1