PRINCIPLES OF CONSOLIDATION (Details)	Jun. 30, 2020	Dec. 31, 2019
Controlling interest joint ventures and equity method investees [Line Items]
Percentage of assets, liabilities, revenues, and expenses of the buildings held in joint ventures with the noncontrolling interests	100.00%	100.00%
Industry Distribution Center II - undivided tenant-in-common interest [Member]
Controlling interest joint ventures and equity method investees [Line Items]
Tenant-in-common interest	50.00%	50.00%
Controlling Interest Joint Ventures [Domain] | University Business Center 120 [Member]
Controlling interest joint ventures and equity method investees [Line Items]
Less Than Wholly Owned Joint Venture Investment Ownership Percentage	80.00%	80.00%
Controlling Interest Joint Ventures [Domain] | Miramar Land [Member]
Controlling interest joint ventures and equity method investees [Line Items]
Less Than Wholly Owned Joint Venture Investment Ownership Percentage	95.00%	95.00%
Controlling Interest Joint Ventures [Domain] | Otay Mesa Land [Member]
Controlling interest joint ventures and equity method investees [Line Items]
Less Than Wholly Owned Joint Venture Investment Ownership Percentage	99.00%	99.00%