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SIGNIFICANT ACCOUNTING POLICIES (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 a Integer | Dec. 31, 2018 | Dec. 31, 2017 Integer
Controlling interest Joint ventures [Abstract] |  |  |
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 | 2 |  |
University Business Center 120 and 130 [Member] |  |  |
Controlling interest Joint ventures [Abstract] |  |  |
Controlling interest in joint ventures (in hundredths) |  | 80.00% | 80.00%
University Business Center [Member] |  |  |
Controlling interest Joint ventures [Abstract] |  |  |
Noncontrolling Interest in Joint Venture Investment Ownership Percentage |  |  | 20.00%
Number of buildings owned in a joint venture agreement |  |  | 2
Total number of buildings |  |  | 4
University Business Center 125 and 175 [Member] |  |  |
Controlling interest Joint ventures [Abstract] |  |  |
Controlling interest in joint ventures (in hundredths) |  |  | 100.00%
University Business Center 120 [Member] |  |  |
Controlling interest Joint ventures [Abstract] |  |  |
Controlling interest in joint ventures (in hundredths) | 80.00% |  |
Industry Distribution Center II - undivided tenant [Member] |  |  |
Tenant-in-common interest [Abstract] |  |  |
Equity method of accounting is used for undivided tenant-in-common interest in Industry Distribution Center II (in hundredths) | 50.00% |  |
Real Estate Properties [Domain] | Miramar Land [Member] |  |  |
Controlling interest Joint ventures [Abstract] |  |  |
Size (in acres) of land acquired | a | 6.5 |  |
Controlling interest in joint ventures (in hundredths) | 95.00% |  |
Real Estate Properties [Domain] | Otay Mesa Land |  |  |
Controlling interest Joint ventures [Abstract] |  |  |
Size (in acres) of land acquired | a | 41.6 |  |
Controlling interest in joint ventures (in hundredths) | 99.00% |  |

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