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SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 a Integer | Dec. 31, 2020 | Dec. 31, 2018
Controlling interest joint ventures & equity method investees |  |  |
Percentage of assets, liabilities, revenues, and expenses of the buildings held in joint ventures with the noncontrolling interests |  | 100.00% |
Number of new joint venture agreements | Integer | 2 |  |
University Business Center 120 and 130 [Member] |  |  |
Controlling interest joint ventures & equity method investees |  |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage |  |  | 80.00%
University Business Center 120 [Member] |  |  |
Controlling interest joint ventures & equity method investees |  |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage | 80.00% |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage |  | 80.00% |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage Sold |  | 80.00% |
Industry Distribution Center II - undivided tenant-in-common interest [Member] |  |  |
Controlling interest joint ventures & equity method investees |  |  |
Tenant-in-common interest in Industry Distribution Center II (in hundredths) |  | 50.00% |
Real Estate Properties [Domain] | Miramar Land [Member] |  |  |
Controlling interest joint ventures & equity method investees |  |  |
Size (in acres) of land acquired | 6.5 |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage | 95.00% | 95.00% |
Real Estate Properties [Domain] | Otay Mesa Land |  |  |
Controlling interest joint ventures & equity method investees |  |  |
Size (in acres) of land acquired | 41.6 |  |
Less Than Wholly Owned Joint Venture Investment Ownership Percentage | 99.00% | 99.00% |

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