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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Rental Revenue: Office | $ 821,609 | [1] | $ 785,820 | [1] | $ 2,442,675 | [2] | $ 2,331,442 | [2]
Rental Revenue: Residential | 12,117 | [1] | 11,789 | [1] | 37,027 | [2] | 35,768 | [2]
Rental Revenue Total | $ 848,808 | [1] | $ 811,093 | [1] | $ 2,517,782 | [2] | $ 2,402,764 | [2]
Rental Revenue: % of Grand Totals | 100.00% |  | 100.00% |  | 100.00% |  | 100.00% |
Rental Expenses: Office | $ 321,909 |  | $ 294,454 |  | $ 946,067 |  | $ 865,552 |
Rental Expenses: Residential | 5,988 |  | 5,738 |  | 17,413 |  | 16,984 |
Rental Expenses: Total | $ 337,730 |  | $ 309,212 |  | $ 989,167 |  | $ 906,388 |
Rental Expenses: % Of Grand Totals | 100.00% |  | 100.00% |  | 100.00% |  | 100.00% |
Net Operating Income | $ 511,078 |  | $ 501,881 |  | $ 1,528,615 |  | $ 1,496,376 |
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 | $ 300,613 | [1] | $ 276,153 | [1] | $ 866,431 | [2] | $ 815,568 | [2]
Rental Revenue: Residential | 4,219 | [1] | 4,198 | [1] | 12,687 | [2] | 12,371 | [2]
Rental Revenue Total | $ 319,914 | [1] | $ 293,835 | [1] | $ 917,198 | [2] | $ 863,493 | [2]
Rental Revenue: % of Grand Totals | 37.69% |  | 36.23% |  | 36.42% |  | 35.95% |
Rental Expenses: Office | $ 107,876 |  | $ 97,358 |  | $ 321,955 |  | $ 293,004 |
Rental Expenses: Residential | 1,621 |  | 1,629 |  | 4,757 |  | 4,782 |
Rental Expenses: Total | $ 119,330 |  | $ 108,007 |  | $ 352,399 |  | $ 321,638 |
Rental Expenses: % Of Grand Totals | 35.34% |  | 34.94% |  | 35.62% |  | 35.49% |
Net Operating Income | $ 200,584 |  | $ 185,828 |  | $ 564,799 |  | $ 541,855 |
Net Operating Income: % of Grand Totals | 39.25% |  | 37.03% |  | 36.96% |  | 36.22% |
Company's Share of Net Operating Income: % of Grand Totals | 39.89% |  | 37.07% |  | 37.51% |  | 36.19% |
Los Angeles [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Rental Revenue: Office | $ 18,661 | [1] | $ 0 | [1] | $ 57,534 | [2] | $ 0 | [2]
Rental Revenue: Residential | 0 | [1] | 0 | [1] | 0 | [2] | 0 | [2]
Rental Revenue Total | $ 18,661 | [1] | $ 0 | [1] | $ 57,534 | [2] | $ 0 | [2]
Rental Revenue: % of Grand Totals | 2.20% |  | 0.00% |  | 2.29% |  | 0.00% |
Rental Expenses: Office | $ 7,344 |  | $ 0 |  | $ 20,678 |  | $ 0 |
Rental Expenses: Residential | 0 |  | 0 |  | 0 |  | 0 |
Rental Expenses: Total | $ 7,344 |  | $ 0 |  | $ 20,678 |  | $ 0 |
Rental Expenses: % Of Grand Totals | 2.17% |  | 0.00% |  | 2.09% |  | 0.00% |
Net Operating Income | $ 11,317 |  | $ 0 |  | $ 36,856 |  | $ 0 |
Net Operating Income: % of Grand Totals | 2.21% |  | 0.00% |  | 2.41% |  | 0.00% |
Company's Share of Net Operating Income: % of Grand Totals | 3.64% |  | 2.55% |  | 3.89% |  | 2.61% |
New York [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Rental Revenue: Office | $ 258,295 | [1] | $ 268,680 | [1] | $ 780,909 | [2] | $ 789,851 | [2]
Rental Revenue: Residential | 0 | [1] | 0 | [1] | 0 | [2] | 0 | [2]
Rental Revenue Total | $ 258,295 | [1] | $ 268,680 | [1] | $ 780,909 | [2] | $ 789,851 | [2]
Rental Revenue: % of Grand Totals | 30.43% |  | 33.13% |  | 31.02% |  | 32.87% |
Rental Expenses: Office | $ 111,419 |  | $ 107,462 |  | $ 327,376 |  | $ 312,895 |
Rental Expenses: Residential | 0 |  | 0 |  | 0 |  | 0 |
Rental Expenses: Total | $ 111,419 |  | $ 107,462 |  | $ 327,376 |  | $ 312,895 |
Rental Expenses: % Of Grand Totals | 32.99% |  | 34.75% |  | 33.10% |  | 34.52% |
Net Operating Income | $ 146,876 |  | $ 161,218 |  | $ 453,533 |  | $ 476,956 |
Net Operating Income: % of Grand Totals | 28.74% |  | 32.12% |  | 29.67% |  | 31.87% |
Company's Share of Net Operating Income: % of Grand Totals | 23.41% |  | 25.84% |  | 24.21% |  | 25.57% |
San Francisco [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Rental Revenue: Office | $ 128,929 | [1] | $ 135,839 | [1] | $ 393,252 | [2] | $ 408,173 | [2]
Rental Revenue: Residential | 3,152 | [1] | 3,214 | [1] | 10,428 | [2] | 10,720 | [2]
Rental Revenue Total | $ 132,081 | [1] | $ 139,053 | [1] | $ 403,680 | [2] | $ 418,893 | [2]
Rental Revenue: % of Grand Totals | 15.56% |  | 17.14% |  | 16.03% |  | 17.43% |
Rental Expenses: Office | $ 52,410 |  | $ 50,450 |  | $ 148,020 |  | $ 144,732 |
Rental Expenses: Residential | 2,346 |  | 2,221 |  | 6,733 |  | 6,609 |
Rental Expenses: Total | $ 54,756 |  | $ 52,671 |  | $ 154,753 |  | $ 151,341 |
Rental Expenses: % Of Grand Totals | 16.21% |  | 17.03% |  | 15.64% |  | 16.70% |
Net Operating Income | $ 77,325 |  | $ 86,382 |  | $ 248,927 |  | $ 267,552 |
Net Operating Income: % of Grand Totals | 15.13% |  | 17.21% |  | 16.28% |  | 17.88% |
Company's Share of Net Operating Income: % of Grand Totals | 16.37% |  | 18.41% |  | 17.65% |  | 18.89% |
Seattle |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Rental Revenue: Office | $ 10,821 | [1] | $ 13,660 | [1] | $ 32,251 | [2] | $ 44,978 | [2]
Rental Revenue: Residential | 0 | [1] | 0 | [1] | 0 | [2] | 0 | [2]
Rental Revenue Total | $ 10,821 | [1] | $ 13,660 | [1] | $ 32,251 | [2] | $ 44,978 | [2]
Rental Revenue: % of Grand Totals | 1.27% |  | 1.68% |  | 1.28% |  | 1.87% |
Rental Expenses: Office | $ 3,382 |  | $ 2,971 |  | $ 9,753 |  | $ 9,013 |
Rental Expenses: Residential | 0 |  | 0 |  | 0 |  | 0 |
Rental Expenses: Total | $ 3,382 |  | $ 2,971 |  | $ 9,753 |  | $ 9,013 |
Rental Expenses: % Of Grand Totals | 1.00% |  | 0.96% |  | 0.99% |  | 0.99% |
Net Operating Income | $ 7,439 |  | $ 10,689 |  | $ 22,498 |  | $ 35,965 |
Net Operating Income: % of Grand Totals | 1.46% |  | 2.13% |  | 1.47% |  | 2.40% |
Company's Share of Net Operating Income: % of Grand Totals | 1.87% |  | 2.56% |  | 1.89% |  | 2.82% |
Washington, DC [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Rental Revenue: Office | $ 104,290 | [1] | $ 91,488 | [1] | $ 312,298 | [2] | $ 272,872 | [2]
Rental Revenue: Residential | 4,746 | [1] | 4,377 | [1] | 13,912 | [2] | 12,677 | [2]
Rental Revenue Total | $ 109,036 | [1] | $ 95,865 | [1] | $ 326,210 | [2] | $ 285,549 | [2]
Rental Revenue: % of Grand Totals | 12.85% |  | 11.82% |  | 12.96% |  | 11.88% |
Rental Expenses: Office | $ 39,478 |  | $ 36,213 |  | $ 118,285 |  | $ 105,908 |
Rental Expenses: Residential | 2,021 |  | 1,888 |  | 5,923 |  | 5,593 |
Rental Expenses: Total | $ 41,499 |  | $ 38,101 |  | $ 124,208 |  | $ 111,501 |
Rental Expenses: % Of Grand Totals | 12.29% |  | 12.32% |  | 12.56% |  | 12.30% |
Net Operating Income | $ 67,537 |  | $ 57,764 |  | $ 202,002 |  | $ 174,048 |
Net Operating Income: % of Grand Totals | 13.21% |  | 11.51% |  | 13.21% |  | 11.63% |
Company's Share of Net Operating Income: % of Grand Totals | 14.82% |  | 13.57% |  | 14.85% |  | 13.92% |
Hotel [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Other revenue | $ 15,082 | [1] | $ 13,484 | [1] | $ 38,080 | [2] | $ 35,554 | [2]
Operating expense | 9,833 |  | 9,020 |  | 25,687 |  | 23,852 |
Hotel [Member] | Boston [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Other revenue | 15,082 | [1] | 13,484 | [1] | 38,080 | [2] | 35,554 | [2]
Operating expense | 9,833 |  | 9,020 |  | 25,687 |  | 23,852 |
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 | (44,487) |  | (50,047) |  | (138,448) |  | (145,102) |
Noncontrolling interest - property partnerships [Member] | Boston [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | (10,823) |  | (11,786) |  | (32,803) |  | (33,946) |
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 | (33,664) |  | (38,261) |  | (105,645) |  | (111,156) |
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 | 31,919 |  | 39,165 |  | 98,936 |  | 122,175 |
Unconsolidated Joint Ventures [Member] | Boston [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 9,099 |  | 7,946 |  | 26,547 |  | 25,294 |
Unconsolidated Joint Ventures [Member] | Los Angeles [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 6,835 |  | 12,508 |  | 21,118 |  | 38,501 |
Unconsolidated Joint Ventures [Member] | New York [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 3,472 |  | 3,938 |  | 12,614 |  | 10,951 |
Unconsolidated Joint Ventures [Member] | San Francisco [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 4,285 |  | 4,023 |  | 13,850 |  | 10,819 |
Unconsolidated Joint Ventures [Member] | Seattle |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 1,899 |  | 1,874 |  | 5,713 |  | 5,598 |
Unconsolidated Joint Ventures [Member] | Washington, DC [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 6,329 |  | 8,876 |  | 19,094 |  | 31,012 |
Company's Share [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 498,510 |  | 490,999 |  | 1,489,103 |  | 1,473,449 |
Company's Share [Member] | Boston [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 198,860 |  | 181,988 |  | 558,543 |  | 533,203 |
Company's Share [Member] | Los Angeles [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 18,152 |  | 12,508 |  | 57,974 |  | 38,501 |
Company's Share [Member] | New York [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 116,684 |  | 126,895 |  | 360,502 |  | 376,751 |
Company's Share [Member] | San Francisco [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 81,610 |  | 90,405 |  | 262,777 |  | 278,371 |
Company's Share [Member] | Seattle |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | 9,338 |  | 12,563 |  | 28,211 |  | 41,563 |
Company's Share [Member] | Washington, DC [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Net Operating Income | $ 73,866 |  | $ 66,640 |  | $ 221,096 |  | $ 205,060 |
[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.

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