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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Class A Office | [1] | $ 3,119,999 | $ 2,968,412 | $ 2,792,160
Rental Revenue: Residential | [1] | 47,592 | 57,181 | 42,668
Rental Revenue Total | [1] | $ 3,214,948 | $ 3,065,075 | $ 2,848,437
Rental Revenue: % of Grand Totals |  | 100.00% | 100.00% | 100.00%
Rental Expenses: Class A Office |  | $ 1,160,697 | $ 1,078,487 | $ 996,707
Rental Expenses: Residential |  | 23,250 | 29,583 | 24,444
Rental Expenses: Total |  | $ 1,216,172 | $ 1,135,548 | $ 1,034,149
Rental Expenses: % Of Grand Totals |  | 100.00% | 100.00% | 100.00%
Net Operating Income |  | $ 1,998,776 | $ 1,929,527 | $ 1,814,288
Net Operating Income: % of Grand Totals |  | 100.00% | 100.00% | 100.00%
Company's Share of Net Operating Income: % of Grand Totals |  | 100.00% | 100.00% | 100.00%
Boston [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Class A Office | [1] | $ 1,093,840 | $ 1,005,156 | $ 930,560
Rental Revenue: Residential | [1] | 16,452 | 15,086 | 13,397
Rental Revenue Total | [1] | $ 1,157,649 | $ 1,059,724 | $ 957,566
Rental Revenue: % of Grand Totals |  | 36.01% | 34.58% | 33.62%
Rental Expenses: Class A Office |  | $ 393,339 | $ 360,218 | $ 322,298
Rental Expenses: Residential |  | 6,378 | 5,961 | 5,811
Rental Expenses: Total |  | $ 431,942 | $ 393,657 | $ 341,107
Rental Expenses: % Of Grand Totals |  | 35.51% | 34.66% | 32.98%
Net Operating Income |  | $ 725,707 | $ 666,067 | $ 616,459
Net Operating Income: % of Grand Totals |  | 36.31% | 34.52% | 33.98%
Company's Share of Net Operating Income: % of Grand Totals |  | 36.35% | 34.75% | 33.98%
Los Angeles [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Class A Office | [1] | $ 3,890 | $ 0 | $ 0
Rental Revenue: Residential | [1] | 0 | 0 | 0
Rental Revenue Total | [1] | $ 3,890 | $ 0 | $ 0
Rental Revenue: % of Grand Totals |  | 0.12% | 0.00% | 0.00%
Rental Expenses: Class A Office |  | $ 1,431 | $ 0 | $ 0
Rental Expenses: Residential |  | 0 | 0 | 0
Rental Expenses: Total |  | $ 1,431 | $ 0 | $ 0
Rental Expenses: % Of Grand Totals |  | 0.12% | 0.00% | 0.00%
Net Operating Income |  | $ 2,459 | $ 0 | $ 0
Net Operating Income: % of Grand Totals |  | 0.12% | 0.00% | 0.00%
Company's Share of Net Operating Income: % of Grand Totals |  | 2.61% | 2.81% | 2.98%
New York [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Class A Office | [1] | $ 1,053,615 | $ 1,031,479 | $ 1,012,172
Rental Revenue: Residential | [1] | 0 | 0 | 0
Rental Revenue Total | [1] | $ 1,053,615 | $ 1,031,479 | $ 1,012,172
Rental Revenue: % of Grand Totals |  | 32.77% | 33.65% | 35.53%
Rental Expenses: Class A Office |  | $ 415,831 | $ 391,293 | $ 379,267
Rental Expenses: Residential |  | 0 | 0 | 0
Rental Expenses: Total |  | $ 415,831 | $ 391,293 | $ 379,267
Rental Expenses: % Of Grand Totals |  | 34.19% | 34.46% | 36.67%
Net Operating Income |  | $ 637,784 | $ 640,186 | $ 632,905
Net Operating Income: % of Grand Totals |  | 31.91% | 33.18% | 34.88%
Company's Share of Net Operating Income: % of Grand Totals |  | 25.62% | 26.32% | 28.18%
San Francisco [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Class A Office | [1] | $ 539,904 | $ 534,397 | $ 508,620
Rental Revenue: Residential | [1] | 14,102 | 14,769 | 3,892
Rental Revenue Total | [1] | $ 554,006 | $ 549,166 | $ 512,512
Rental Revenue: % of Grand Totals |  | 17.23% | 17.92% | 17.99%
Rental Expenses: Class A Office |  | $ 194,205 | $ 183,353 | $ 168,040
Rental Expenses: Residential |  | 9,255 | 11,371 | 6,717
Rental Expenses: Total |  | $ 203,460 | $ 194,724 | $ 174,757
Rental Expenses: % Of Grand Totals |  | 16.73% | 17.15% | 16.90%
Net Operating Income |  | $ 350,546 | $ 354,442 | $ 337,755
Net Operating Income: % of Grand Totals |  | 17.54% | 18.37% | 18.62%
Company's Share of Net Operating Income: % of Grand Totals |  | 18.66% | 19.49% | 20.27%
Seattle |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Class A Office | [1] | $ 63,830 | $ 31,978 | $ 0
Rental Revenue: Residential | [1] | 0 | 0 | 0
Rental Revenue Total | [1] | $ 63,830 | $ 31,978 | $ 0
Rental Revenue: % of Grand Totals |  | 1.99% | 1.04% | 0.00%
Rental Expenses: Class A Office |  | $ 12,387 | $ 8,386 | $ 0
Rental Expenses: Residential |  | 0 | 0 | 0
Rental Expenses: Total |  | $ 12,387 | $ 8,386 | $ 0
Rental Expenses: % Of Grand Totals |  | 1.02% | 0.74% | 0.00%
Net Operating Income |  | $ 51,443 | $ 23,592 | $ 0
Net Operating Income: % of Grand Totals |  | 2.57% | 1.22% | 0.00%
Company's Share of Net Operating Income: % of Grand Totals |  | 3.00% | 1.66% | 0.14%
Washington, DC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Rental Revenue: Class A Office | [1] | $ 364,920 | $ 365,402 | $ 340,808
Rental Revenue: Residential | [1] | 17,038 | 27,326 | 25,379
Rental Revenue Total | [1] | $ 381,958 | $ 392,728 | $ 366,187
Rental Revenue: % of Grand Totals |  | 11.88% | 12.81% | 12.86%
Rental Expenses: Class A Office |  | $ 143,504 | $ 135,237 | $ 127,102
Rental Expenses: Residential |  | 7,617 | 12,251 | 11,916
Rental Expenses: Total |  | $ 151,121 | $ 147,488 | $ 139,018
Rental Expenses: % Of Grand Totals |  | 12.43% | 12.99% | 13.45%
Net Operating Income |  | $ 230,837 | $ 245,240 | $ 227,169
Net Operating Income: % of Grand Totals |  | 11.55% | 12.71% | 12.52%
Company's Share of Net Operating Income: % of Grand Totals |  | 13.76% | 14.97% | 14.45%
Hotel [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other revenue | [1] | $ 47,357 | $ 39,482 | $ 13,609
Operating expense |  | 32,225 | 27,478 | 12,998
Hotel [Member] | Boston [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other revenue | [1] | 47,357 | 39,482 | 13,609
Operating expense |  | 32,225 | 27,478 | 12,998
Hotel [Member] | Los Angeles [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other revenue | [1] | 0 | 0 | 0
Operating expense |  | 0 | 0 | 0
Hotel [Member] | New York [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other revenue | [1] | 0 | 0 | 0
Operating expense |  | 0 | 0 | 0
Hotel [Member] | San Francisco [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other revenue | [1] | 0 | 0 | 0
Operating expense |  | 0 | 0 | 0
Hotel [Member] | Seattle |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other revenue | [1] | 0 | 0 | 0
Operating expense |  | 0 | 0 | 0
Hotel [Member] | Washington, DC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other revenue | [1] | 0 | 0 | 0
Operating expense |  | 0 | 0 | 0
Noncontrolling interest - property partnerships [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | (194,365) | (191,812) | (186,304)
Noncontrolling interest - property partnerships [Member] | Boston [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | (45,730) | (45,822) | (43,232)
Noncontrolling interest - property partnerships [Member] | Los Angeles [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 0 | 0 | 0
Noncontrolling interest - property partnerships [Member] | New York [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | (148,635) | (145,990) | (143,072)
Noncontrolling interest - property partnerships [Member] | San Francisco [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 0 | 0 | 0
Noncontrolling interest - property partnerships [Member] | Seattle |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 0 | 0 | 0
Noncontrolling interest - property partnerships [Member] | Washington, DC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 0 | 0 | 0
Unconsolidated Joint Ventures [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  |  |  | 107,756
Unconsolidated Joint Ventures [Member] | Boston [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 34,376 | 34,233 | 16,551
Unconsolidated Joint Ventures [Member] | Los Angeles [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 48,818 | 53,023 | 51,641
Unconsolidated Joint Ventures [Member] | New York [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 14,314 | 1,594 | (664)
Unconsolidated Joint Ventures [Member] | San Francisco [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 16,203 | 12,785 | 14,152
Unconsolidated Joint Ventures [Member] | Seattle |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 7,494 | 7,690 | 2,498
Unconsolidated Joint Ventures [Member] | Washington, DC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 39,490 | 36,756 | 23,578
Company's Share [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 1,965,106 | 1,883,796 | 1,735,740
Company's Share [Member] | Boston [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 714,353 | 654,478 | 589,778
Company's Share [Member] | Los Angeles [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 51,277 | 53,023 | 51,641
Company's Share [Member] | New York [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 503,463 | 495,790 | 489,169
Company's Share [Member] | San Francisco [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 366,749 | 367,227 | 351,907
Company's Share [Member] | Seattle |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | 58,937 | 31,282 | 2,498
Company's Share [Member] | Washington, DC [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net Operating Income |  | $ 270,327 | $ 281,996 | $ 250,747
[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.

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