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REAL ESTATE PROPERTIES REAL ESTATE PROPERTIES 1 (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Property, Plant and Equipment [Line Items] |  |  |
Land |  | $ 452,698,000 | $ 380,684,000
Buildings and building improvements |  | 1,907,963,000 | 1,732,592,000
Tenant and other mprovements |  | 471,909,000 | 440,205,000
Right-of-Use Assets - Ground Leases (operating) | [1] | 11,997,000 | 0
Development and value-add properties | [2] | 419,999,000 | 263,664,000
Real estate, development and value-add properties |  | 3,264,566,000 | 2,817,145,000
Real Estate Investment Property, Accumulated Depreciation |  | (871,139,000) | (814,915,000)
Real Estate Investment Property, Net |  | $ 2,393,427,000 | $ 2,002,230,000
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% |
[1] | See Ground Leases discussion below and in Note 1(o) for information regarding the Company's right of use assets for ground leases.
[2] | 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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