SEGMENT INFORMATION - Schedule of Net Operating Income of Company's Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Total revenue	$ 121,516	$ 126,484
Operating expenses	(47,591)	(47,414)
Net operating income	73,925	79,070
Operating Segments | Philadelphia CBD
Segment Reporting Information [Line Items]
Total revenue	55,388	55,988
Operating expenses	(20,631)	(19,882)
Net operating income	34,757	36,106
Operating Segments | Pennsylvania Suburbs
Segment Reporting Information [Line Items]
Total revenue	31,931	32,019
Operating expenses	(10,055)	(9,359)
Net operating income	21,876	22,660
Operating Segments | Austin, Texas
Segment Reporting Information [Line Items]
Total revenue	18,151	23,255
Operating expenses	(7,767)	(9,013)
Net operating income	10,384	14,242
Operating Segments | Other
Segment Reporting Information [Line Items]
Total revenue	10,523	10,968
Operating expenses	(5,224)	(5,462)
Net operating income	5,299	5,506
Corporate
Segment Reporting Information [Line Items]
Total revenue	5,523	4,254
Operating expenses	(3,914)	(3,698)
Net operating income	$ 1,609	$ 556