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Concentration of Credit Risk (Details)
ft² in Millions
Jun. 30, 2019
a
ft²
property
Northern New Jersey/New York City  
Real Estate Properties [Line Items]  
Percentage accounted by properties of its annualized base rent 28.50%
Los Angeles  
Real Estate Properties [Line Items]  
Percentage accounted by properties of its annualized base rent 16.30%
Office building | Northern New Jersey/New York City  
Real Estate Properties [Line Items]  
Number of buildings 59
Area of real estate property | ft² 3.3
Office building | Los Angeles  
Real Estate Properties [Line Items]  
Number of buildings 35
Area of real estate property | ft² 2.4
Land parcels | Northern New Jersey/New York City  
Real Estate Properties [Line Items]  
Number of buildings 8
Area of real estate property | a 46.7
Land parcels | Los Angeles  
Real Estate Properties [Line Items]  
Number of buildings 5
Area of real estate property | a 10.1