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SIGNIFICANT ACCOUNTING POLICIES (Details 4) | 12 Months Ended
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Dec. 31, 2020 USD ($) Integer | Dec. 31, 2019 USD ($) a | Dec. 31, 2018 USD ($)
Property Acquisitions |  |  |
Number of Reportable Segments | Integer | 1 |  |
Development properties [Member] |  |  |
Property Acquisitions |  |  |
Percentage of Occupation when property transfers from the development and value-add program to real estate properties | 90.00% |  |
Length of Time After Project Acquisition (for Value-add) or Shell Completion (for Developments) When Project Transfers to Real Estate Properties | 1 year |  |
Value-add properties [Member] |  |  |
Property Acquisitions |  |  |
Percentage of Occupation when property transfers from the development and value-add program to real estate properties | 90.00% |  |
Length of Time After Project Acquisition (for Value-add) or Shell Completion (for Developments) When Project Transfers to Real Estate Properties | 1 year |  |
Development and value-add properties [Member] |  |  |
Property Acquisitions |  |  |
Percentage of Occupation When Costs Ceased Being Capitalized for development and value-add properties | 90.00% |  |
Length of Time After Project Completion When Development Cost Ceased Being Capitalized | 1 year |  |
Otay Mesa Land | Real Estate Properties [Domain] |  |  |
Property Acquisitions |  |  |
Size (in acres) of land acquired | a |  | 41.6 |
Total cost of properties purchased |  | $ 15,282,000 |
Miramar Land [Member] | Below market lease [Member] |  |  |
Property Acquisitions |  |  |
Intangibles acquired associated with purchase of Real Estate |  | 593,000 |
Miramar Land [Member] | Land and Land Improvements [Member] |  |  |
Property Acquisitions |  |  |
Book value of land based on third party valuations |  | $ 13,979,000 |
Miramar Land [Member] | Real Estate Properties [Domain] |  |  |
Property Acquisitions |  |  |
Size (in acres) of land acquired | a |  | 6.5 |
Total cost of properties purchased |  | $ 13,386,000 |
Yosemite Land | Real Estate Properties [Domain] |  |  |
Property Acquisitions |  |  |
Size (in acres) of land acquired | a |  | 0.5 |
Total cost of properties purchased |  | $ 472,000 |
2019 Acquisitions [Member] |  |  |
Property Acquisitions |  |  |
Total cost of properties purchased |  | 205,841,000 |
2019 Acquisitions [Member] | Above Market Leases [Member] |  |  |
Property Acquisitions |  |  |
Intangibles acquired associated with purchase of Real Estate |  | 344,000 |
2019 Acquisitions [Member] | Leases, Acquired-in-Place [Member] |  |  |
Property Acquisitions |  |  |
Intangibles acquired associated with purchase of Real Estate |  | 10,020,000 |
2019 Acquisitions [Member] | Below market lease [Member] |  |  |
Property Acquisitions |  |  |
Intangibles acquired associated with purchase of Real Estate |  | 2,092,000 |
2019 Acquisitions [Member] | Development and value-add properties [Member] |  |  |
Property Acquisitions |  |  |
Total amount allocated to real estate properties |  | 92,268,000 |
2019 Acquisitions [Member] | Land and Land Improvements [Member] |  |  |
Property Acquisitions |  |  |
Book value of land based on third party valuations |  | 46,778,000 |
2019 Acquisitions [Member] | Real Estate Properties [Domain] |  |  |
Property Acquisitions |  |  |
Total amount allocated to real estate properties |  | $ 105,301,000 |
2018 Acquisitions [Member] |  |  |
Property Acquisitions |  |  |
Total cost of properties purchased |  |  | $ 71,086,000
2018 Acquisitions [Member] | Above Market Leases [Member] |  |  |
Property Acquisitions |  |  |
Intangibles acquired associated with purchase of Real Estate |  |  | 21,000
2018 Acquisitions [Member] | Leases, Acquired-in-Place [Member] |  |  |
Property Acquisitions |  |  |
Intangibles acquired associated with purchase of Real Estate |  |  | 4,350,000
2018 Acquisitions [Member] | Below market lease [Member] |  |  |
Property Acquisitions |  |  |
Intangibles acquired associated with purchase of Real Estate |  |  | 1,756,000
2018 Acquisitions [Member] | Development and value-add properties [Member] |  |  |
Property Acquisitions |  |  |
Total amount allocated to real estate properties |  |  | 13,934,000
2018 Acquisitions [Member] | Land and Land Improvements [Member] |  |  |
Property Acquisitions |  |  |
Book value of land based on third party valuations |  |  | 23,263,000
2018 Acquisitions [Member] | Real Estate Properties [Domain] |  |  |
Property Acquisitions |  |  |
Total amount allocated to real estate properties |  |  | $ 54,537,000
2020 Acquisitions [Member] |  |  |
Property Acquisitions |  |  |
Total cost of properties purchased | $ 76,518,000 |  |
2020 Acquisitions [Member] | Above Market Leases [Member] |  |  |
Property Acquisitions |  |  |
Intangibles acquired associated with purchase of Real Estate | 104,000 |  |
2020 Acquisitions [Member] | Leases, Acquired-in-Place [Member] |  |  |
Property Acquisitions |  |  |
Intangibles acquired associated with purchase of Real Estate | 3,257,000 |  |
2020 Acquisitions [Member] | Below market lease [Member] |  |  |
Property Acquisitions |  |  |
Intangibles acquired associated with purchase of Real Estate | 403,000 |  |
2020 Acquisitions [Member] | Development and value-add properties [Member] |  |  |
Property Acquisitions |  |  |
Total amount allocated to real estate properties | 27,320,000 |  |
2020 Acquisitions [Member] | Land and Land Improvements [Member] |  |  |
Property Acquisitions |  |  |
Book value of land based on third party valuations | 23,565,000 |  |
2020 Acquisitions [Member] | Real Estate Properties [Domain] |  |  |
Property Acquisitions |  |  |
Total amount allocated to real estate properties | $ 46,240,000 |  |

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