v3.25.2
Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (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 Revenue: Office $ 828,202 $ 812,944 $ 1,657,198 $ 1,621,066
Rental Revenue: Residential 12,532 12,226 24,880 24,910
Rental Revenue Total $ 855,507 $ 839,982 $ 1,706,448 $ 1,668,974
Rental Revenue: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Rental Expenses: Office $ 325,484 $ 315,687 $ 651,165 $ 624,158
Rental Expenses: Residential 6,578 5,739 12,475 11,425
Rental Expenses: Total $ 341,427 $ 331,265 $ 680,570 $ 651,437
Rental Expenses: % Of Grand Totals 100.00% 100.00% 100.00% 100.00%
Net Operating Income $ 514,080 $ 508,717 $ 1,025,878 $ 1,017,537
Net Operating Income: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Company's Share of Net Operating Income: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Boston [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 303,822 $ 285,352 $ 609,111 $ 565,818
Rental Revenue: Residential 4,400 4,272 8,529 8,468
Rental Revenue Total $ 322,995 $ 304,436 $ 642,010 $ 597,284
Rental Revenue: % of Grand Totals 37.75% 36.25% 37.63% 35.80%
Rental Expenses: Office $ 111,235 $ 108,908 $ 228,120 $ 214,079
Rental Expenses: Residential 1,673 1,543 3,481 3,136
Rental Expenses: Total $ 122,273 $ 120,290 $ 248,531 $ 233,069
Rental Expenses: % Of Grand Totals 35.81% 36.31% 36.51% 35.77%
Net Operating Income $ 200,722 $ 184,146 $ 393,479 $ 364,215
Net Operating Income: % of Grand Totals 39.05% 36.20% 38.36% 35.80%
Company's Share of Net Operating Income: % of Grand Totals 39.32% 36.91% 38.44% 36.31%
Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 17,616 $ 18,472 $ 34,781 $ 38,873
Rental Revenue: Residential 0 0 0 0
Rental Revenue Total $ 17,616 $ 18,472 $ 34,781 $ 38,873
Rental Revenue: % of Grand Totals 2.06% 2.20% 2.04% 2.33%
Rental Expenses: Office $ 6,950 $ 6,767 $ 13,446 $ 13,334
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Total $ 6,950 $ 6,767 $ 13,446 $ 13,334
Rental Expenses: % Of Grand Totals 2.04% 2.04% 1.98% 2.05%
Net Operating Income $ 10,666 $ 11,705 $ 21,335 $ 25,539
Net Operating Income: % of Grand Totals 2.07% 2.30% 2.08% 2.51%
Company's Share of Net Operating Income: % of Grand Totals 3.59% 3.80% 3.62% 4.02%
New York [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 264,089 $ 261,805 $ 527,514 $ 522,614
Rental Revenue: Residential 0 0 0 0
Rental Revenue Total $ 264,089 $ 261,805 $ 527,514 $ 522,614
Rental Revenue: % of Grand Totals 30.87% 31.17% 30.91% 31.31%
Rental Expenses: Office $ 114,676 $ 108,476 $ 224,637 $ 215,957
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Total $ 114,676 $ 108,476 $ 224,637 $ 215,957
Rental Expenses: % Of Grand Totals 33.59% 32.75% 33.01% 33.15%
Net Operating Income $ 149,413 $ 153,329 $ 302,877 $ 306,657
Net Operating Income: % of Grand Totals 29.06% 30.14% 29.52% 30.14%
Company's Share of Net Operating Income: % of Grand Totals 23.32% 24.35% 24.05% 24.61%
San Francisco [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 125,380 $ 131,709 $ 251,188 $ 264,323
Rental Revenue: Residential 3,355 3,318 6,858 7,276
Rental Revenue Total $ 128,735 $ 135,027 $ 258,046 $ 271,599
Rental Revenue: % of Grand Totals 15.05% 16.07% 15.12% 16.27%
Rental Expenses: Office $ 49,632 $ 48,668 $ 98,184 $ 95,610
Rental Expenses: Residential 2,804 2,169 4,944 4,387
Rental Expenses: Total $ 52,436 $ 50,837 $ 103,128 $ 99,997
Rental Expenses: % Of Grand Totals 15.36% 15.35% 15.15% 15.35%
Net Operating Income $ 76,299 $ 84,190 $ 154,918 $ 171,602
Net Operating Income: % of Grand Totals 14.84% 16.55% 15.10% 16.86%
Company's Share of Net Operating Income: % of Grand Totals 16.31% 17.97% 16.56% 18.29%
Seattle        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 12,112 $ 10,520 $ 24,103 $ 21,430
Rental Revenue: Residential 0 0 0 0
Rental Revenue Total $ 12,112 $ 10,520 $ 24,103 $ 21,430
Rental Revenue: % of Grand Totals 1.42% 1.25% 1.41% 1.28%
Rental Expenses: Office $ 2,986 $ 3,290 $ 5,982 $ 6,371
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Total $ 2,986 $ 3,290 $ 5,982 $ 6,371
Rental Expenses: % Of Grand Totals 0.87% 0.99% 0.88% 0.98%
Net Operating Income $ 9,126 $ 7,230 $ 18,121 $ 15,059
Net Operating Income: % of Grand Totals 1.78% 1.42% 1.77% 1.48%
Company's Share of Net Operating Income: % of Grand Totals 2.31% 1.86% 2.29% 1.91%
Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Office $ 105,183 $ 105,086 $ 210,501 $ 208,008
Rental Revenue: Residential 4,777 4,636 9,493 9,166
Rental Revenue Total $ 109,960 $ 109,722 $ 219,994 $ 217,174
Rental Revenue: % of Grand Totals 12.85% 13.06% 12.89% 13.01%
Rental Expenses: Office $ 40,005 $ 39,578 $ 80,796 $ 78,807
Rental Expenses: Residential 2,101 2,027 4,050 3,902
Rental Expenses: Total $ 42,106 $ 41,605 $ 84,846 $ 82,709
Rental Expenses: % Of Grand Totals 12.33% 12.56% 12.47% 12.70%
Net Operating Income $ 67,854 $ 68,117 $ 135,148 $ 134,465
Net Operating Income: % of Grand Totals 13.20% 13.39% 13.17% 13.21%
Company's Share of Net Operating Income: % of Grand Totals 15.15% 15.11% 15.04% 14.86%
Hotel [Member]        
Segment Reporting Information [Line Items]        
Other revenue $ 14,773 $ 14,812 $ 24,370 $ 22,998
Operating expense 9,365 9,839 16,930 15,854
Hotel [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Other revenue 14,773 14,812 24,370 22,998
Operating expense 9,365 9,839 16,930 15,854
Hotel [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Other revenue 0 0 0 0
Operating expense 0 0 0 0
Hotel [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Other revenue 0 0 0 0
Operating expense 0 0 0 0
Hotel [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Other revenue 0 0 0 0
Operating expense 0 0 0 0
Hotel [Member] | Seattle        
Segment Reporting Information [Line Items]        
Other revenue 0 0 0 0
Operating expense 0 0 0 0
Hotel [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Other revenue 0 0 0 0
Operating expense 0 0 0 0
Noncontrolling interest - property partnerships [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income (51,562) (47,391) (101,264) (93,961)
Noncontrolling interest - property partnerships [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income (15,728) (10,924) (31,029) (21,980)
Noncontrolling interest - property partnerships [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 0 0 0 0
Noncontrolling interest - property partnerships [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income (35,834) (36,467) (70,235) (71,981)
Noncontrolling interest - property partnerships [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 0 0 0 0
Noncontrolling interest - property partnerships [Member] | Seattle        
Segment Reporting Information [Line Items]        
Net Operating Income 0 0 0 0
Noncontrolling interest - property partnerships [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 0 0 0 0
Unconsolidated Joint Ventures [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 31,029 31,587 63,711 67,017
Unconsolidated Joint Ventures [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 9,070 8,691 17,521 17,448
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 7,053 7,035 14,405 14,283
Unconsolidated Joint Ventures [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 1,511 3,158 5,024 9,142
Unconsolidated Joint Ventures [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 4,198 4,411 8,779 9,565
Unconsolidated Joint Ventures [Member] | Seattle        
Segment Reporting Information [Line Items]        
Net Operating Income 2,277 1,938 4,534 3,814
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 6,920 6,354 13,448 12,765
Company's Share [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 493,547 492,913 988,325 990,593
Company's Share [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 194,064 181,913 379,971 359,683
Company's Share [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 17,719 18,740 35,740 39,822
Company's Share [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 115,090 120,020 237,666 243,818
Company's Share [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 80,497 88,601 163,697 181,167
Company's Share [Member] | Seattle        
Segment Reporting Information [Line Items]        
Net Operating Income 11,403 9,168 22,655 18,873
Company's Share [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income $ 74,774 $ 74,471 $ 148,596 $ 147,230