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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