Segments - Schedule of NOI for Each Reportable Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Property-related revenues		$ 188,123	$ 184,608	$ 553,856	$ 536,211
Property-related operating expenses		(80,316)	(75,502)	(226,248)	(216,889)
NOI attributable to noncontrolling interests in consolidated joint ventures		(23,723)	(22,275)	(70,532)	(67,551)
NOI from unconsolidated joint ventures	[1]	5,384	5,240	16,611	16,048
Paramount's share of NOI	[2]	89,468	92,071	273,687	267,819
New York [Member]
Segment Reporting Information [Line Items]
Property-related revenues		116,383	118,749	347,669	342,812
Property-related operating expenses		(55,612)	(52,470)	(156,992)	(150,676)
NOI attributable to noncontrolling interests in consolidated joint ventures		(2,424)	(3,049)	(7,600)	(8,415)
NOI from unconsolidated joint ventures	[1]	3,407	3,376	10,442	10,143
Paramount's share of NOI	[2]	61,754	66,606	193,519	193,864
San Francisco [Member]
Segment Reporting Information [Line Items]
Property-related revenues		71,523	66,252	206,337	194,564
Property-related operating expenses		(23,498)	(22,447)	(66,391)	(64,529)
NOI attributable to noncontrolling interests in consolidated joint ventures		(21,299)	(19,226)	(62,932)	(59,136)
NOI from unconsolidated joint ventures	[1]	2,018	1,865	6,128	5,847
Paramount's share of NOI	[2]	28,744	26,444	83,142	76,746
Other [Member]
Segment Reporting Information [Line Items]
Property-related revenues		217	(393)	(150)	(1,165)
Property-related operating expenses		(1,206)	(585)	(2,865)	(1,684)
NOI attributable to noncontrolling interests in consolidated joint ventures		0	0	0	0
NOI from unconsolidated joint ventures	[1]	(41)	(1)	41	58
Paramount's share of NOI	[2]	$ (1,030)	$ (979)	$ (2,974)	$ (2,791)

[1] Excludes NOI from One Steuart Lane, a for-sale residential condominium project, and “non-core” assets (Market Center and 111 Sutter Street).

[2] NOI is used to measure the operating performance of our properties. NOI consists of rental revenue (which includes property rentals, tenant reimbursements and lease termination income) and certain other property-related revenue less operating expenses (which include property-related expenses such as cleaning, security, repairs and maintenance, utilities, property administration and real estate taxes). We use NOI internally as a performance measure and believe it provides useful information to investors regarding our financial condition and results of operations because it reflects only those income and expense items that are incurred at the property level. Other real estate companies may use different methodologies for calculating NOI and, accordingly, our presentation of NOI may not be comparable to other real estate companies.