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Concentration of Credit Risk (Details)
ft² in Millions
Sep. 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 29.50%
Los Angeles  
Real Estate Properties [Line Items]  
Percentage accounted by properties of its annualized base rent 16.20%
Office building | Northern New Jersey/New York City  
Real Estate Properties [Line Items]  
Number of properties 61
Area of real estate property | ft² 3.5
Office building | Los Angeles  
Real Estate Properties [Line Items]  
Number of properties 42
Area of real estate property | ft² 2.5
Land parcels | Northern New Jersey/New York City  
Real Estate Properties [Line Items]  
Number of properties 9
Area of real estate property | a 48.7
Land parcels | Los Angeles  
Real Estate Properties [Line Items]  
Number of properties 5
Area of real estate property | a 10.1