Organization and Basis of Presentation (Details) - Mar. 31, 2016	ft²	Total	project	tenant	building
Stabilized Office Properties [Member]
Real Estate Properties [Line Items]
Number of properties			10		103
Rentable square feet	13,671,730
Number of Tenants | tenant				523
Percentage Occupied		94.90%
Development projects in lease-up [Member]
Real Estate Properties [Line Items]
Number of properties | project			2
Rentable square feet	443,000
Development projects under construction [Member]
Real Estate Properties [Line Items]
Number of properties | project			2
Rentable square feet	905,000