ORGANIZATION OF THE PARENT COMPANY AND THE OPERATING PARTNERSHIP - Summary of Core Portfolio of Operating Properties and Excludes Development, Redevelopment and Held for Sale (Details)	Sep. 30, 2023 ft² property
Real Estate Properties [Line Items]
Number of Properties | property	74
Rentable Square Feet | ft²	13,179,875
Core Properties
Real Estate Properties [Line Items]
Number of Properties | property	70
Rentable Square Feet | ft²	12,598,531
Office properties
Real Estate Properties [Line Items]
Number of Properties | property	65
Rentable Square Feet | ft²	11,656,197
Mixed-use properties
Real Estate Properties [Line Items]
Number of Properties | property	5
Rentable Square Feet | ft²	942,334
Development property
Real Estate Properties [Line Items]
Number of Properties | property	1
Rentable Square Feet | ft²	144,685
Redevelopment properties
Real Estate Properties [Line Items]
Number of Properties | property	2
Rentable Square Feet | ft²	268,365
Recently completed - not stabilized property
Real Estate Properties [Line Items]
Number of Properties | property	1
Rentable Square Feet | ft²	168,294