Reportable Segments - NOI from Our Rental Real Estate for Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Rental income	$ 768,827	$ 734,163	$ 1,529,637	$ 1,464,981
Operating expenses	248,606	232,069	504,331	475,626
NOI	520,221	502,094	1,025,306	989,355
Same Store
Segment Reporting Information [Line Items]
Rental income	727,043	707,750	1,433,835	1,399,994
Operating expenses	229,434	221,318	462,051	444,398
NOI	497,609	486,432	971,784	955,596
Los Angeles | Same Store
Segment Reporting Information [Line Items]
Rental income	121,545	120,118	242,484	239,386
Operating expenses	37,782	35,856	76,589	73,686
NOI	83,763	84,262	165,895	165,700
Orange County | Same Store
Segment Reporting Information [Line Items]
Rental income	31,964	31,171	63,811	62,272
Operating expenses	6,964	6,908	14,221	13,805
NOI	25,000	24,263	49,590	48,467
San Diego | Same Store
Segment Reporting Information [Line Items]
Rental income	21,287	20,746	42,392	41,370
Operating expenses	4,622	4,257	9,307	8,604
NOI	16,665	16,489	33,085	32,766
Subtotal - Southern California | Same Store
Segment Reporting Information [Line Items]
Rental income	174,796	172,035	348,687	343,028
Operating expenses	49,368	47,021	100,117	96,095
NOI	125,428	125,014	248,570	246,933
Washington D.C. | Same Store
Segment Reporting Information [Line Items]
Rental income	116,496	111,280	226,463	216,933
Operating expenses	36,016	35,360	71,768	68,319
NOI	80,480	75,920	154,695	148,614
San Francisco | Same Store
Segment Reporting Information [Line Items]
Rental income	114,497	109,549	223,067	214,833
Operating expenses	33,201	31,330	67,254	64,258
NOI	81,296	78,219	155,813	150,575
New York | Same Store
Segment Reporting Information [Line Items]
Rental income	127,960	122,172	254,116	246,136
Operating expenses	51,832	50,077	104,832	101,455
NOI	76,128	72,095	149,284	144,681
Boston | Same Store
Segment Reporting Information [Line Items]
Rental income	82,917	82,081	164,613	162,532
Operating expenses	24,184	23,266	49,663	47,354
NOI	58,733	58,815	114,950	115,178
Seattle | Same Store
Segment Reporting Information [Line Items]
Rental income	69,769	68,427	139,131	135,974
Operating expenses	19,912	19,632	39,657	38,863
NOI	49,857	48,795	99,474	97,111
Denver | Same Store
Segment Reporting Information [Line Items]
Rental income	19,199	19,937	38,367	39,690
Operating expenses	5,753	5,801	11,808	11,835
NOI	13,446	14,136	26,559	27,855
Other Expansion Markets | Same Store
Segment Reporting Information [Line Items]
Rental income	21,409	22,269	39,391	40,868
Operating expenses	9,168	8,831	16,952	16,219
NOI	12,241	13,438	22,439	24,649
Non-same store
Segment Reporting Information [Line Items]
Rental income	40,934	4,920	91,124	20,162
Operating expenses	15,376	2,477	33,292	9,509
NOI	25,558	2,443	57,832	10,653
Same and Non-same Store
Segment Reporting Information [Line Items]
Rental income	767,977	712,670	1,524,959	1,420,156
Operating expenses	244,810	223,795	495,343	453,907
NOI	523,167	488,875	1,029,616	966,249
Other
Segment Reporting Information [Line Items]
Rental income	850	21,493	4,678	44,825
Operating expenses	3,796	8,274	8,988	21,719
NOI	$ (2,946)	$ 13,219	$ (4,310)	$ 23,106