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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office $ 812,944 [1] $ 776,464 [1] $ 1,621,066 [2] $ 1,545,622 [2]
Rental Revenue: Residential 12,226 [1] 12,253 [1] 24,910 [2] 23,979 [2]
Rental Revenue Total $ 839,982 [1] $ 802,686 [1] $ 1,668,974 [2] $ 1,591,671 [2]
Rental Revenue: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Rental Expenses: Class A Office $ 315,687 $ 285,253 $ 624,158 $ 571,098
Rental Expenses: Residential 5,739 5,783 11,425 11,246
Rental Expenses: Total $ 331,265 $ 299,197 $ 651,437 $ 597,176
Rental Expenses: % Of Grand Totals 100.00% 100.00% 100.00% 100.00%
Net Operating Income $ 508,717 $ 503,489 $ 1,017,537 $ 994,495
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: Class A Office $ 285,352 [1] $ 269,464 [1] $ 565,818 [2] $ 539,415 [2]
Rental Revenue: Residential 4,272 [1] 4,124 [1] 8,468 [2] 8,173 [2]
Rental Revenue Total $ 304,436 [1] $ 287,557 [1] $ 597,284 [2] $ 569,658 [2]
Rental Revenue: % of Grand Totals 36.25% 35.83% 35.80% 35.79%
Rental Expenses: Class A Office $ 108,908 $ 95,597 $ 214,079 $ 195,646
Rental Expenses: Residential 1,543 1,601 3,136 3,153
Rental Expenses: Total $ 120,290 $ 105,359 $ 233,069 $ 213,631
Rental Expenses: % Of Grand Totals 36.31% 35.21% 35.77% 35.78%
Net Operating Income $ 184,146 $ 182,198 $ 364,215 $ 356,027
Net Operating Income: % of Grand Totals 36.20% 36.19% 35.80% 35.80%
Company's Share of Net Operating Income: % of Grand Totals 36.91% 36.08% 36.31% 35.75%
Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office $ 18,472 [1] $ 0 [1] $ 38,873 [2] $ 0 [2]
Rental Revenue: Residential 0 [1] 0 [1] 0 [2] 0 [2]
Rental Revenue Total $ 18,472 [1] $ 0 [1] $ 38,873 [2] $ 0 [2]
Rental Revenue: % of Grand Totals 2.20% 0.00% 2.33% 0.00%
Rental Expenses: Class A Office $ 6,767 $ 0 $ 13,334 $ 0
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Total $ 6,767 $ 0 $ 13,334 $ 0
Rental Expenses: % Of Grand Totals 2.04% 0.00% 2.05% 0.00%
Net Operating Income $ 11,705 $ 0 $ 25,539 $ 0
Net Operating Income: % of Grand Totals 2.30% 0.00% 2.51% 0.00%
Company's Share of Net Operating Income: % of Grand Totals 3.80% 2.56% 4.02% 2.65%
New York [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office $ 261,805 [1] $ 262,979 [1] $ 522,614 [2] $ 521,171 [2]
Rental Revenue: Residential 0 [1] 0 [1] 0 [2] 0 [2]
Rental Revenue Total $ 261,805 [1] $ 262,979 [1] $ 522,614 [2] $ 521,171 [2]
Rental Revenue: % of Grand Totals 31.17% 32.76% 31.31% 32.74%
Rental Expenses: Class A Office $ 108,476 $ 102,948 $ 215,957 $ 205,433
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Total $ 108,476 $ 102,948 $ 215,957 $ 205,433
Rental Expenses: % Of Grand Totals 32.75% 34.41% 33.15% 34.40%
Net Operating Income $ 153,329 $ 160,031 $ 306,657 $ 315,738
Net Operating Income: % of Grand Totals 30.14% 31.78% 30.14% 31.75%
Company's Share of Net Operating Income: % of Grand Totals 24.35% 25.47% 24.61% 25.43%
San Francisco [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office $ 131,709 [1] $ 136,241 [1] $ 264,323 [2] $ 272,334 [2]
Rental Revenue: Residential 3,318 [1] 3,864 [1] 7,276 [2] 7,506 [2]
Rental Revenue Total $ 135,027 [1] $ 140,105 [1] $ 271,599 [2] $ 279,840 [2]
Rental Revenue: % of Grand Totals 16.07% 17.45% 16.27% 17.58%
Rental Expenses: Class A Office $ 48,668 $ 48,197 $ 95,610 $ 94,282
Rental Expenses: Residential 2,169 2,215 4,387 4,388
Rental Expenses: Total $ 50,837 $ 50,412 $ 99,997 $ 98,670
Rental Expenses: % Of Grand Totals 15.35% 16.85% 15.35% 16.52%
Net Operating Income $ 84,190 $ 89,693 $ 171,602 $ 181,170
Net Operating Income: % of Grand Totals 16.55% 17.81% 16.86% 18.22%
Company's Share of Net Operating Income: % of Grand Totals 17.97% 18.69% 18.29% 19.13%
Seattle        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office $ 10,520 [1] $ 17,060 [1] $ 21,430 [2] $ 31,318 [2]
Rental Revenue: Residential 0 [1] 0 [1] 0 [2] 0 [2]
Rental Revenue Total $ 10,520 [1] $ 17,060 [1] $ 21,430 [2] $ 31,318 [2]
Rental Revenue: % of Grand Totals 1.25% 2.13% 1.28% 1.97%
Rental Expenses: Class A Office $ 3,290 $ 3,082 $ 6,371 $ 6,042
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Total $ 3,290 $ 3,082 $ 6,371 $ 6,042
Rental Expenses: % Of Grand Totals 0.99% 1.03% 0.98% 1.01%
Net Operating Income $ 7,230 $ 13,978 $ 15,059 $ 25,276
Net Operating Income: % of Grand Totals 1.42% 2.78% 1.48% 2.54%
Company's Share of Net Operating Income: % of Grand Totals 1.86% 3.19% 1.91% 2.95%
Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office $ 105,086 [1] $ 90,720 [1] $ 208,008 [2] $ 181,384 [2]
Rental Revenue: Residential 4,636 [1] 4,265 [1] 9,166 [2] 8,300 [2]
Rental Revenue Total $ 109,722 [1] $ 94,985 [1] $ 217,174 [2] $ 189,684 [2]
Rental Revenue: % of Grand Totals 13.06% 11.83% 13.01% 11.92%
Rental Expenses: Class A Office $ 39,578 $ 35,429 $ 78,807 $ 69,695
Rental Expenses: Residential 2,027 1,967 3,902 3,705
Rental Expenses: Total $ 41,605 $ 37,396 $ 82,709 $ 73,400
Rental Expenses: % Of Grand Totals 12.56% 12.50% 12.70% 12.29%
Net Operating Income $ 68,117 $ 57,589 $ 134,465 $ 116,284
Net Operating Income: % of Grand Totals 13.39% 11.44% 13.21% 11.69%
Company's Share of Net Operating Income: % of Grand Totals 15.11% 14.01% 14.86% 14.09%
Hotel [Member]        
Segment Reporting Information [Line Items]        
Other revenue $ 14,812 [1] $ 13,969 [1] $ 22,998 [2] $ 22,070 [2]
Operating expense 9,839 8,161 15,854 14,832
Hotel [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Other revenue 14,812 [1] 13,969 [1] 22,998 [2] 22,070 [2]
Operating expense 9,839 8,161 15,854 14,832
Hotel [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Other revenue 0 [1] 0 [1] 0 [2] 0 [2]
Operating expense 0 0 0 0
Hotel [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Other revenue 0 [1] 0 [1] 0 [2] 0 [2]
Operating expense 0 0 0 0
Hotel [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Other revenue 0 [1] 0 [1] 0 [2] 0 [2]
Operating expense 0 0 0 0
Hotel [Member] | Seattle        
Segment Reporting Information [Line Items]        
Other revenue 0 [1] 0 [1] 0 [2] 0 [2]
Operating expense 0 0 0 0
Hotel [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Other revenue 0 [1] 0 [1] 0 [2] 0 [2]
Operating expense 0 0 0 0
Noncontrolling interest - property partnerships [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income (47,391) (47,958) (93,961) (95,055)
Noncontrolling interest - property partnerships [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income (10,924) (11,343) (21,980) (22,160)
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 (36,467) (36,615) (71,981) (72,895)
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 31,587 42,254 67,017 83,010
Unconsolidated Joint Ventures [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 8,691 8,771 17,448 17,348
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 7,035 12,768 14,283 25,993
Unconsolidated Joint Ventures [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 3,158 3,363 9,142 7,013
Unconsolidated Joint Ventures [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 4,411 3,332 9,565 6,796
Unconsolidated Joint Ventures [Member] | Seattle        
Segment Reporting Information [Line Items]        
Net Operating Income 1,938 1,878 3,814 3,724
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 6,354 12,142 12,765 22,136
Company's Share [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 492,913 497,785 990,593 982,450
Company's Share [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 181,913 179,626 359,683 351,215
Company's Share [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 18,740 12,768 39,822 25,993
Company's Share [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 120,020 126,779 243,818 249,856
Company's Share [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 88,601 93,025 181,167 187,966
Company's Share [Member] | Seattle        
Segment Reporting Information [Line Items]        
Net Operating Income 9,168 15,856 18,873 29,000
Company's Share [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income $ 74,471 $ 69,731 $ 147,230 $ 138,420
[1] Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.
[2] Rental Revenue is equal to Total Revenue per the Company’s Consolidated Statements of Operations, less Development and Management Services Revenue and Direct Reimbursements of Payroll and Related Costs from Management Services Contracts Revenue per the Consolidated Statements of Operations.