Reportable Segments - NOI from Our Rental Real Estate for Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Segment Reporting Information [Line Items]
Rental income	$ 782,411	$ 748,348	$ 2,312,048	$ 2,213,329
Operating expenses	256,454	241,175	760,785	716,801
NOI	525,957	507,173	1,551,263	1,496,528
Same Store
Segment Reporting Information [Line Items]
Rental income	727,555	706,135	2,145,055	2,090,438
Operating expenses	234,572	226,494	691,712	665,731
NOI	492,983	479,641	1,453,343	1,424,707
Los Angeles \| Same Store
Segment Reporting Information [Line Items]
Rental income	122,414	120,210	364,899	359,596
Operating expenses	38,867	37,415	115,456	111,101
NOI	83,547	82,795	249,443	248,495
Orange County \| Same Store
Segment Reporting Information [Line Items]
Rental income	32,216	31,487	96,026	93,760
Operating expenses	7,486	7,306	21,707	21,111
NOI	24,730	24,181	74,319	72,649
San Diego \| Same Store
Segment Reporting Information [Line Items]
Rental income	21,482	20,802	63,874	62,172
Operating expenses	4,748	4,518	14,055	13,121
NOI	16,734	16,284	49,819	49,051
Subtotal - Southern California \| Same Store
Segment Reporting Information [Line Items]
Rental income	176,112	172,499	524,799	515,528
Operating expenses	51,101	49,239	151,218	145,333
NOI	125,011	123,260	373,581	370,195
San Francisco \| Same Store
Segment Reporting Information [Line Items]
Rental income	116,271	109,811	337,075	322,643
Operating expenses	34,509	33,550	101,315	97,285
NOI	81,762	76,261	235,760	225,358
New York \| Same Store
Segment Reporting Information [Line Items]
Rental income	129,940	123,506	384,057	369,642
Operating expenses	52,099	49,949	156,931	151,404
NOI	77,841	73,557	227,126	218,238
Washington D.C. \| Same Store
Segment Reporting Information [Line Items]
Rental income	113,992	110,288	332,425	319,579
Operating expenses	37,791	36,122	107,042	101,973
NOI	76,201	74,166	225,383	217,606
Boston \| Same Store
Segment Reporting Information [Line Items]
Rental income	80,416	79,872	240,793	238,308
Operating expenses	24,599	22,732	72,807	68,678
NOI	55,817	57,140	167,986	169,630
Seattle \| Same Store
Segment Reporting Information [Line Items]
Rental income	70,742	68,519	209,873	204,493
Operating expenses	20,279	19,784	59,936	58,647
NOI	50,463	48,735	149,937	145,846
Denver \| Same Store
Segment Reporting Information [Line Items]
Rental income	18,878	19,649	57,246	59,339
Operating expenses	5,893	6,117	17,702	17,952
NOI	12,985	13,532	39,544	41,387
Other Expansion Markets \| Same Store
Segment Reporting Information [Line Items]
Rental income	21,204	21,991	58,787	60,906
Operating expenses	8,301	9,001	24,761	24,459
NOI	12,903	12,990	34,026	36,447
Non-same store
Segment Reporting Information [Line Items]
Rental income	51,872	17,287	149,440	43,763
Operating expenses	18,962	6,160	54,171	18,623
NOI	32,910	11,127	95,269	25,140
Same and Non-same Store
Segment Reporting Information [Line Items]
Rental income	779,427	723,422	2,294,495	2,134,201
Operating expenses	253,534	232,654	745,883	684,354
NOI	525,893	490,768	1,548,612	1,449,847
Other
Segment Reporting Information [Line Items]
Rental income	2,984	24,926	17,553	79,128
Operating expenses	2,920	8,521	14,902	32,447
NOI	$ 64	$ 16,405	$ 2,651	$ 46,681