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SIGNIFICANT ACCOUNTING POLICIES (Details 4) | 12 Months Ended
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Dec. 31, 2019 USD ($) a Integer | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Number of Reportable Segments | Integer | 1 |  |
Length of Time After Project Completion When Development Cost Ceased Being Capitalized | 1 year |  |
Development properties [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
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, Plant and Equipment [Line Items] |  |  |
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, Plant and Equipment [Line Items] |  |  |
Length of Time After Project Completion When Development Cost Ceased Being Capitalized | 1 year |  |
Percentage of Occupation When Development & Value-add Cost Ceased Being Capitalized | 90.00% |  |
Otay Mesa Land | Real Estate Properties [Domain] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
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, Plant and Equipment [Line Items] |  |  |
Intangibles acquired associated with purchase of Real Estate | $ 593,000 |  |
Miramar Land [Member] | Real Estate Properties [Domain] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Size (in acres) of land acquired | a | 6.5 |  |
Total cost of properties purchased | $ 13,386,000 |  |
Book value of land based on third party valuations | $ 13,979,000 |  |
Yosemite Land | Real Estate Properties [Domain] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Size (in acres) of land acquired | a | 0.5 |  |
Total cost of properties purchased | $ 472,000 |  |
2019 Acquisitions [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total cost of properties purchased | 205,841,000 |  |
2019 Acquisitions [Member] | Above Market Leases [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Intangibles acquired associated with purchase of Real Estate | 344,000 |  |
2019 Acquisitions [Member] | Leases, Acquired-in-Place [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Intangibles acquired associated with purchase of Real Estate | 10,020,000 |  |
2019 Acquisitions [Member] | Below market lease [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Intangibles acquired associated with purchase of Real Estate | 2,092,000 |  |
2019 Acquisitions [Member] | Development and value-add properties [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total amount allocated to real estate properties | 92,268,000 |  |
2019 Acquisitions [Member] | Land and Land Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total purchase price allocated to land | 46,778,000 |  |
2019 Acquisitions [Member] | Real estate properties [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total amount allocated to real estate properties | $ 105,301,000 |  |
2018 Acquisitions [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total cost of properties purchased |  | $ 71,086,000 |
2018 Acquisitions [Member] | Above Market Leases [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Intangibles acquired associated with purchase of Real Estate |  | 21,000 |
2018 Acquisitions [Member] | Leases, Acquired-in-Place [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Intangibles acquired associated with purchase of Real Estate |  | 4,350,000 |
2018 Acquisitions [Member] | Below market lease [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Intangibles acquired associated with purchase of Real Estate |  | 1,756,000 |
2018 Acquisitions [Member] | Development and value-add properties [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total amount allocated to real estate properties |  | 13,934,000 |
2018 Acquisitions [Member] | Land and Land Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total purchase price allocated to land |  | 23,263,000 |
2018 Acquisitions [Member] | Real Estate Properties [Domain] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total amount allocated to real estate properties |  | $ 54,537,000 |
2017 Acquisitions |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total cost of properties purchased |  |  | $ 65,243,000
2017 Acquisitions | Above Market Leases [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Intangibles acquired associated with purchase of Real Estate |  |  | 115,000
2017 Acquisitions | Leases, Acquired-in-Place [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Intangibles acquired associated with purchase of Real Estate |  |  | 3,662,000
2017 Acquisitions | Below market lease [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Intangibles acquired associated with purchase of Real Estate |  |  | 385,000
2017 Acquisitions | Development and value-add properties [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total amount allocated to real estate properties |  |  | 10,312,000
2017 Acquisitions | Land and Land Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total purchase price allocated to land |  |  | 11,281,000
2017 Acquisitions | Real estate properties [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Total amount allocated to real estate properties |  |  | $ 51,539,000

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