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REAL ESTATE PROPERTIES - Summary (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Real Estate Properties [Line Items]    
Land $ 502,739,000 $ 452,698,000
Buildings and building improvements 2,120,731,000 1,907,963,000
Tenant and other mprovements 524,954,000 471,909,000
Right-of-Use Assets - Ground Leases (operating) 11,073,000 11,997,000
Development and value-add properties [1] 359,588,000 419,999,000
Real estate, development and value-add properties 3,519,085,000 3,264,566,000
Real Estate Investment Property, Accumulated Depreciation 955,328,000 871,139,000
Real Estate Investment Property, Net $ 2,563,757,000 $ 2,393,427,000
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] 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.