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RELATED-PARTY TRANSACTIONS - Affiliate Investments and Other Narrative (Details)	1 Months Ended			3 Months Ended			9 Months Ended
	Oct. 31, 2023 USD ($) ft²	Feb. 28, 2023 USD ($) ft²	Feb. 28, 2022 USD ($)	Sep. 30, 2024 USD ($) ft²	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2024 USD ($) ft²	Sep. 30, 2023 USD ($) asset	Aug. 07, 2019 ft²	May 15, 2019 ft²
Related Party Transaction [Line Items]
Payments to acquire equity method investment							$ 1,463,000	$ 7,218,000
Rental and other property income				$ 18,150,000	$ 17,061,000		56,172,000	49,999,000
Income from unconsolidated entities				$ (1,239,000)	1,189,000		$ (442,000)	$ 1,053,000
Acquisition of Four Assets
Related Party Transaction [Line Items]
Number of assets from entities | asset								4
Payment for interest acquired								$ 282,900,000
Corporate Joint Venture | Eleven Year Lease
Related Party Transaction [Line Items]
Lease, term of contract with related party										11 years
Rentable area (square feet) | ft²									30,000	32,000
Rental and other property income						$ 194,000
1910 Sunset Boulevard
Related Party Transaction [Line Items]
Payments to acquire equity method investment			$ 22,400,000
Ownership Interest				44.20%			44.20%
Income from unconsolidated entities				$ (763,000)	(402,000)		$ (764,000)	(683,000)
1910 Sunset Boulevard | Office Building
Related Party Transaction [Line Items]
Rentable area (square feet) | ft²				104,764			104,764
1910 Sunset Boulevard | Corporate Joint Venture
Related Party Transaction [Line Items]
Payments to acquire equity method investment			$ 51,000,000
1902 Park Avenue
Related Party Transaction [Line Items]
Ownership Interest				50.00%			50.00%
1902 Park Avenue | Corporate Joint Venture
Related Party Transaction [Line Items]
Purchase price		$ 19,100,000
Ownership Interest		50.00%
Income from unconsolidated entities				$ (405,000)	(422,000)		$ (929,000)	216,000
1902 Park JV
Related Party Transaction [Line Items]
Payments to acquire equity method investment		$ 6,600,000
1902 Park JV | Corporate Joint Venture | Mortgage Payable
Related Party Transaction [Line Items]
Aggregate principal amount		$ 9,600,000
1015 N Mansfield Avenue
Related Party Transaction [Line Items]
Ownership Interest				28.80%			28.80%
1015 N Mansfield Avenue | Office Building
Related Party Transaction [Line Items]
Rentable area (square feet) | ft²				44,141			44,141
1015 N Mansfield Avenue | Corporate Joint Venture
Related Party Transaction [Line Items]
Purchase price	$ 18,000,000
Ownership Interest	28.80%
Percentage of ownership acquired	100.00%
Income from unconsolidated entities				$ 0			$ 1,100,000
1015 N Mansfield Avenue | Corporate Joint Venture | Office Building
Related Party Transaction [Line Items]
Area of land (square feet) | ft²	44,141
4750 Wilshire Boulevard
Related Party Transaction [Line Items]
Ownership Interest				20.00%			20.00%
4750 Wilshire Boulevard | Office Building
Related Party Transaction [Line Items]
Rentable area (square feet) | ft²		30,335		30,335			30,335
4750 Wilshire Boulevard | Eleven Year Lease
Related Party Transaction [Line Items]
Ownership percentage sold		80.00%
4750 Wilshire JV
Related Party Transaction [Line Items]
Ownership Interest				20.00%			20.00%
4750 Wilshire JV | Eleven Year Lease
Related Party Transaction [Line Items]
Ownership Interest		20.00%
4750 Wilshire JV | Corporate Joint Venture
Related Party Transaction [Line Items]
Income from unconsolidated entities				$ (71,000)	2,000,000		$ 123,000	1,500,000
4750 Wilshire JV | Corporate Joint Venture | Eleven Year Lease
Related Party Transaction [Line Items]
Income from unconsolidated entities				$ 84,000	$ 80,000		$ 248,000	$ 170,000

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