Concentration of Credit Risk (Details) ft² in Millions	Mar. 31, 2022 a ft² property
Real Estate Properties
Percentage accounted by properties of its annualized base rent	27.40%
Office building | Northern New Jersey/New York City
Real Estate Properties
Number of properties (property)	62
Area of real estate property | ft²	3.4
Improved Land parcels | Northern New Jersey/New York City
Real Estate Properties
Number of properties (property)	10
Area of real estate property | a	54.2