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REAL ESTATE PROPERTIES (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) Integer | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Percentage of occupancy to qualify as value-add property |  |  |  |  | 75.00% |  |
Percentage of acquisition price to be spent on capital items to qualify as value-add property |  |  |  |  | 20.00% |  |
Number of properties impacted by involuntary conversion | Integer |  |  | 2 |  |  |  |
Amortization expense for lease intangibles |  | $ 1,157,000 |  | $ 1,101,000 | $ 3,202,000 | $ 3,455,000 |
Depreciation Expense During the Period |  | 18,960,000 |  | 17,323,000 | 55,785,000 | 51,070,000 |
Real Estate Properties |  |  |  |  |  |  |
Land |  | 376,658,000 |  |  | 376,658,000 |  | $ 345,424,000
Building and building improvements |  | 1,703,237,000 |  |  | 1,703,237,000 |  | 1,587,130,000
Tenant and other improvements |  | 431,751,000 |  |  | 431,751,000 |  | 404,180,000
Development and value-add properties | [1] | 244,761,000 |  |  | 244,761,000 |  | 242,014,000
Real estate, development and value-add properties |  | 2,756,407,000 |  |  | 2,756,407,000 |  | 2,578,748,000
Less accumulated depreciation |  | (796,037,000) |  |  | (796,037,000) |  | (749,601,000)
Real estate, net |  | 1,960,370,000 |  |  | 1,960,370,000 |  | 1,829,147,000
Rental Income Increase Decrease For Amortization Of Acquired In Place Lease Intangibles |  | (217,000) |  | $ (129,000) | (477,000) | (406,000) |
Gain on casualties and involuntary conversion |  |  | $ 1,150,000 |  | $ 1,150,000 | $ 0 |
Building [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 40 years |  |
Minimum [Member] | Improvements [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 3 years |  |
Maximum [Member] | Improvements [Member] |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |
Property, Plant and Equipment, Useful Life |  |  |  |  | 15 years |  |
2018 Acquisitions [Member] |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |
Total cost of properties purchased |  |  |  |  | $ 66,868,000 |  |
Amount of total cost allocated to land |  | 22,461,000 |  |  | 22,461,000 |  |
2017 Acquisitions [Member] |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |
Total cost of properties purchased |  |  |  |  |  |  | 65,243,000
Amount of total cost allocated to land |  |  |  |  |  |  | 11,281,000
Below market lease [Member] | 2018 Acquisitions [Member] |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 1,618,000 |  |  | 1,618,000 |  |
Below market lease [Member] | 2017 Acquisitions [Member] |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  | 385,000
Above Market Leases [Member] | 2018 Acquisitions [Member] |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  | 21,000 |  |  | 21,000 |  |
Above Market Leases [Member] | 2017 Acquisitions [Member] |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  | 115,000
Industrial Development [Member] | 2018 Acquisitions [Member] |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |
Amount of total cost allocated to real estate properties |  | $ 13,934,000 |  |  | $ 13,934,000 |  |
Industrial Development [Member] | 2017 Acquisitions [Member] |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |
Amount of total cost allocated to real estate properties |  |  |  |  |  |  | $ 10,312,000
[1] | Value-add properties are defined as properties that are either acquired but not stabilized or can be converted to a higher and better use. Acquired properties meeting either of the following two conditions are considered value-add properties: (1) Less than 75% occupied as of the acquisition date (or will be less than 75% occupied within one year of acquisition date based on near term lease roll), or (2) 20% or greater of the acquisition cost will be spent to redevelop the property.

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