Organization of The Parent Company and The Operating Partnership (Textual) (Details) ft² in Millions	Dec. 31, 2015 ft² a property Real_Estate_Investments
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	179
Och Ziff Properties [Member] | Held for Sale Properties Included in Continuing Operations [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	59
Office Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	106
Industrial Facilities [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	6
Mixed Use Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	3
Retail Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	1
Core Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	116
Development Property [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	2
Redevelopment Property [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	1
Re-entitlement Property [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Number of Properties	1
Parent Company [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Ownership in the Operating Partnership	99.10%
Net Rentable Square Feet | ft²	23.0
Area Owned by Company of Undeveloped Parcels Of Land | a	412
Area Of Additional Undeveloped Parcels Of Land With Option to Purchase | a	50
Total Potential Development Capacity | ft²	7.1
Undeveloped Land Held for Sale. | a	120
Unconsolidated Real Estate Ventures [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet | ft²	4.3
Number of Unconsolidated Real Estate Ventures | Real_Estate_Investments	16
Subsidiaries [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Ownership in the Operating Partnership	100.00%
Wholly-owned Management Company Subsidiaries [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet | ft²	29.5
Wholly-owned Management Company Subsidiaries [Member] | Wholly Owned Properties [Member]
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet | ft²	23.0
Wholly-owned Management Company Subsidiaries [Member] | Partially Owned Properties
Organization of The Parent Company and The Operating Partnership [Line Items]
Net Rentable Square Feet | ft²	6.5