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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 2,792,160 | $ 2,678,795 | $ 2,824,634
Rental Revenue: Residential | 42,668 | 38,146 | 36,914
Rental Revenue Total | $ 2,848,437 | $ 2,724,419 | $ 2,910,137
Rental Revenue: % of Grand Totals | 100.00% | 100.00% | 100.00%
Rental Expenses: Class A Office | $ 996,707 | $ 998,469 | $ 1,034,025
Rental Expenses: Residential | 24,444 | 18,739 | 15,985
Rental Expenses: Total | $ 1,034,149 | $ 1,030,344 | $ 1,084,014
Rental Expenses: % Of Grand Totals | 100.00% | 100.00% | 100.00%
Net Operating Income | $ 1,814,288 | $ 1,694,075 | $ 1,826,123
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%
Segment Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Other revenue | $ (12,487) | $ (11,626) | $ (10,386)
Operating expense | (12,487) | (11,626) | (10,386)
Boston [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | 930,560 | 897,915 | 895,098
Rental Revenue: Residential | 13,397 | 13,616 | 13,786
Rental Revenue Total | $ 957,566 | $ 919,009 | $ 957,473
Rental Revenue: % of Grand Totals | 33.62% | 33.73% | 32.90%
Rental Expenses: Class A Office | $ 322,298 | $ 318,509 | $ 322,282
Rental Expenses: Residential | 5,811 | 5,378 | 5,071
Rental Expenses: Total | $ 341,107 | $ 337,023 | $ 361,357
Rental Expenses: % Of Grand Totals | 32.98% | 32.71% | 33.34%
Net Operating Income | $ 616,459 | $ 581,986 | $ 596,116
Net Operating Income: % of Grand Totals | 33.98% | 34.35% | 32.64%
Company's Share of Net Operating Income: % of Grand Totals | 33.98% | 33.88% | 32.27%
Los Angeles [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 0 | $ 0 | $ 0
Rental Revenue: Residential | 0 | 0 | 0
Rental Revenue Total | $ 0 | $ 0 | $ 0
Rental Revenue: % of Grand Totals | 0.00% | 0.00% | 0.00%
Rental Expenses: Class A Office | $ 0 | $ 0 | $ 0
Rental Expenses: Residential | 0 | 0 | 0
Rental Expenses: Total | $ 0 | $ 0 | $ 0
Rental Expenses: % Of Grand Totals | 0.00% | 0.00% | 0.00%
Net Operating Income | $ 0 | $ 0 | $ 0
Net Operating Income: % of Grand Totals | 0.00% | 0.00% | 0.00%
Company's Share of Net Operating Income: % of Grand Totals | 2.98% | 3.56% | 3.53%
New York [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 1,012,172 | $ 935,966 | $ 1,011,912
Rental Revenue: Residential | 0 | 0 | 0
Rental Revenue Total | $ 1,012,172 | $ 935,966 | $ 1,011,912
Rental Revenue: % of Grand Totals | 35.53% | 34.36% | 34.78%
Rental Expenses: Class A Office | $ 379,267 | $ 384,753 | $ 389,532
Rental Expenses: Residential | 0 | 0 | 0
Rental Expenses: Total | $ 379,267 | $ 384,753 | $ 389,532
Rental Expenses: % Of Grand Totals | 36.67% | 37.35% | 35.93%
Net Operating Income | $ 632,905 | $ 551,213 | $ 622,380
Net Operating Income: % of Grand Totals | 34.88% | 32.54% | 34.09%
Company's Share of Net Operating Income: % of Grand Totals | 28.18% | 26.12% | 27.77%
San Francisco [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 508,620 | $ 508,327 | $ 533,189
Rental Revenue: Residential | 3,892 | 155 | 0
Rental Revenue Total | $ 512,512 | $ 508,482 | $ 533,189
Rental Revenue: % of Grand Totals | 17.99% | 18.66% | 18.32%
Rental Expenses: Class A Office | $ 168,040 | $ 163,156 | $ 177,994
Rental Expenses: Residential | 6,717 | 2,261 | 0
Rental Expenses: Total | $ 174,757 | $ 165,417 | $ 177,994
Rental Expenses: % Of Grand Totals | 16.90% | 16.05% | 16.42%
Net Operating Income | $ 337,755 | $ 343,065 | $ 355,195
Net Operating Income: % of Grand Totals | 18.62% | 20.25% | 19.45%
Company's Share of Net Operating Income: % of Grand Totals | 20.27% | 22.02% | 20.39%
Seattle |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 0 |  |
Rental Revenue: Residential | 0 |  |
Rental Revenue Total | $ 0 |  |
Rental Revenue: % of Grand Totals | 0.00% |  |
Rental Expenses: Class A Office | $ 0 |  |
Rental Expenses: Residential | 0 |  |
Rental Expenses: Total | $ 0 |  |
Rental Expenses: % Of Grand Totals | 0.00% |  |
Net Operating Income | $ 0 |  |
Net Operating Income: % of Grand Totals | 0.00% |  |
Company's Share of Net Operating Income: % of Grand Totals | 0.14% |  |
Washington, DC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Rental Revenue: Class A Office | $ 340,808 | $ 336,587 | $ 384,435
Rental Revenue: Residential | 25,379 | 24,375 | 23,128
Rental Revenue Total | $ 366,187 | $ 360,962 | $ 407,563
Rental Revenue: % of Grand Totals | 12.86% | 13.25% | 14.00%
Rental Expenses: Class A Office | $ 127,102 | $ 132,051 | $ 144,217
Rental Expenses: Residential | 11,916 | 11,100 | 10,914
Rental Expenses: Total | $ 139,018 | $ 143,151 | $ 155,131
Rental Expenses: % Of Grand Totals | 13.45% | 13.89% | 14.31%
Net Operating Income | $ 227,169 | $ 217,811 | $ 252,432
Net Operating Income: % of Grand Totals | 12.52% | 12.86% | 13.82%
Company's Share of Net Operating Income: % of Grand Totals | 14.45% | 14.42% | 16.04%
Hotel [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other revenue | $ 13,609 | $ 7,478 | $ 48,589
Operating expense | 12,998 | 13,136 | 34,004
Hotel [Member] | Boston [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other revenue | 13,609 | 7,478 | 48,589
Operating expense | 12,998 | 13,136 | 34,004
Hotel [Member] | Los Angeles [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other revenue | 0 | 0 | 0
Operating expense | 0 | 0 | 0
Hotel [Member] | New York [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other revenue | 0 | 0 | 0
Operating expense | 0 | 0 | 0
Hotel [Member] | San Francisco [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other revenue | 0 | 0 | 0
Operating expense | 0 | 0 | 0
Hotel [Member] | Seattle |  |  |
Segment Reporting Information [Line Items] |  |  |
Other revenue | 0 |  |
Operating expense | 0 |  |
Hotel [Member] | Washington, DC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Other revenue | 0 | 0 | 0
Operating expense | 0 | 0 | 0
Noncontrolling interest - property partnerships [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | (186,304) | (162,887) | (183,989)
Noncontrolling interest - property partnerships [Member] | Segment Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | (186,304) | (162,887) | (183,989)
Noncontrolling interest - property partnerships [Member] | Boston [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | (43,232) | (41,849) | (40,109)
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 | (143,072) | (121,038) | (143,432)
Noncontrolling interest - property partnerships [Member] | San Francisco [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 0 | 0 | (448)
Noncontrolling interest - property partnerships [Member] | Seattle |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 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 Reconciling Items |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | (107,756) | (94,943) | (97,716)
Unconsolidated Joint Ventures [Member] | Boston [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 16,551 | 10,765 | 5,494
Unconsolidated Joint Ventures [Member] | Los Angeles [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 51,641 | 57,907 | 61,338
Unconsolidated Joint Ventures [Member] | New York [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | (664) | (5,326) | 4,174
Unconsolidated Joint Ventures [Member] | San Francisco [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 14,152 | 14,928 | 0
Unconsolidated Joint Ventures [Member] | Seattle |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 2,498 |  |
Unconsolidated Joint Ventures [Member] | Washington, DC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 23,578 | 16,669 | 26,710
Company's Share [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 1,735,740 | 1,626,131 | 1,739,850
Company's Share [Member] | Boston [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 589,778 | 550,902 | 561,501
Company's Share [Member] | Los Angeles [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 51,641 | 57,907 | 61,338
Company's Share [Member] | New York [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 489,169 | 424,849 | 483,122
Company's Share [Member] | San Francisco [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 351,907 | 357,993 | 354,747
Company's Share [Member] | Seattle |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | 2,498 |  |
Company's Share [Member] | Washington, DC [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Net Operating Income | $ 250,747 | $ 234,480 | $ 279,142

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