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, 2022 ft² property
Real Estate Properties [Line Items]
Number of Properties | property	78
Rentable area (in square feet) | ft²	13,664,209
Core Properties
Real Estate Properties [Line Items]
Number of Properties | property	72
Rentable area (in square feet) | ft²	12,791,041
Office properties
Real Estate Properties [Line Items]
Number of Properties | property	67
Rentable area (in square feet) | ft²	11,848,707
Mixed-use properties
Real Estate Properties [Line Items]
Number of Properties | property	5
Rentable area (in square feet) | ft²	942,334
Development property
Real Estate Properties [Line Items]
Number of Properties | property	1
Rentable area (in square feet) | ft²	144,685
Redevelopment properties
Real Estate Properties [Line Items]
Number of Properties | property	3
Rentable area (in square feet) | ft²	436,659
Recently completed - not stabilized property
Real Estate Properties [Line Items]
Number of Properties | property	1
Rentable area (in square feet) | ft²	205,803
Held for sale properties
Real Estate Properties [Line Items]
Number of Properties | property	1
Rentable area (in square feet) | ft²	86,021