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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] $ 2,678,795 $ 2,824,634 $ 2,590,659
Rental Revenue: Residential [1] 38,146 36,914 22,551
Rental Revenue Total [1] $ 2,724,419 $ 2,910,137 $ 2,662,328
Rental Revenue: % of Grand Totals [1] 100.00% 100.00% 100.00%
Rental Expenses: Class A Office $ 998,469 $ 1,034,025 $ 966,547
Rental Expenses: Residential 18,739 15,985 12,604
Rental Expenses: Total $ 1,030,344 $ 1,084,014 $ 1,013,014
Rental Expenses: % Of Grand Totals 100.00% 100.00% 100.00%
Net Operating Income $ 1,694,075 $ 1,826,123 $ 1,649,314
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%
Total revenue $ 2,765,686 $ 2,960,562 $ 2,717,076
Boston [Member]      
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] 897,915 895,098 838,341
Rental Revenue: Residential [1] 13,616 13,786 6,694
Rental Revenue Total [1] $ 919,009 $ 957,473 $ 894,153
Rental Revenue: % of Grand Totals [1] 33.73% 32.90% 33.59%
Rental Expenses: Class A Office $ 318,509 $ 322,282 $ 315,653
Rental Expenses: Residential 5,378 5,071 3,632
Rental Expenses: Total $ 337,023 $ 361,357 $ 353,148
Rental Expenses: % Of Grand Totals 32.71% 33.34% 34.86%
Net Operating Income $ 581,986 $ 596,116 $ 541,005
Net Operating Income: % of Grand Totals 34.35% 32.64% 32.80%
Company's Share of Net Operating Income: % of Grand Totals 33.88% 32.27% 32.86%
Los Angeles [Member]      
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] $ 0 $ 0 $ 0
Rental Revenue: Residential [1] 0 0 0
Rental Revenue Total [1] $ 0 $ 0 $ 0
Rental Revenue: % of Grand Totals [1] 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 3.56% 3.53% 2.75%
New York [Member]      
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] $ 935,966 $ 1,011,912 $ 959,050
Rental Revenue: Residential [1] 0 0 0
Rental Revenue Total [1] $ 935,966 $ 1,011,912 $ 959,050
Rental Revenue: % of Grand Totals [1] 34.36% 34.78% 36.02%
Rental Expenses: Class A Office $ 384,753 $ 389,532 $ 377,992
Rental Expenses: Residential 0 0 0
Rental Expenses: Total $ 384,753 $ 389,532 $ 377,992
Rental Expenses: % Of Grand Totals 37.35% 35.93% 37.32%
Net Operating Income $ 551,213 $ 622,380 $ 581,058
Net Operating Income: % of Grand Totals 32.54% 34.09% 35.23%
Company's Share of Net Operating Income: % of Grand Totals 26.12% 27.77% 28.63%
San Francisco [Member]      
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] $ 508,327 $ 533,189 $ 397,180
Rental Revenue: Residential [1] 155 0 0
Rental Revenue Total [1] $ 508,482 $ 533,189 $ 397,180
Rental Revenue: % of Grand Totals [1] 18.66% 18.32% 14.92%
Rental Expenses: Class A Office $ 163,156 $ 177,994 $ 130,016
Rental Expenses: Residential 2,261 0 0
Rental Expenses: Total $ 165,417 $ 177,994 $ 130,016
Rental Expenses: % Of Grand Totals 16.05% 16.42% 12.83%
Net Operating Income $ 343,065 $ 355,195 $ 267,164
Net Operating Income: % of Grand Totals 20.25% 19.45% 16.20%
Company's Share of Net Operating Income: % of Grand Totals 22.02% 20.39% 17.22%
Washington, DC [Member]      
Segment Reporting Information [Line Items]      
Rental Revenue: Class A Office [1] $ 336,587 $ 384,435 $ 396,088
Rental Revenue: Residential [1] 24,375 23,128 15,857
Rental Revenue Total [1] $ 360,962 $ 407,563 $ 411,945
Rental Revenue: % of Grand Totals [1] 13.25% 14.00% 15.47%
Rental Expenses: Class A Office $ 132,051 $ 144,217 $ 142,886
Rental Expenses: Residential 11,100 10,914 8,972
Rental Expenses: Total $ 143,151 $ 155,131 $ 151,858
Rental Expenses: % Of Grand Totals 13.89% 14.31% 14.99%
Net Operating Income $ 217,811 $ 252,432 $ 260,087
Net Operating Income: % of Grand Totals 12.86% 13.82% 15.77%
Company's Share of Net Operating Income: % of Grand Totals 14.42% 16.04% 18.54%
Hotel [Member]      
Segment Reporting Information [Line Items]      
Other revenue [1] $ 7,478 $ 48,589 $ 49,118
Operating expense 13,136 34,004 33,863
Hotel [Member] | Boston [Member]      
Segment Reporting Information [Line Items]      
Other revenue [1] 7,478 48,589 49,118
Operating expense 13,136 34,004 33,863
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] | 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 (162,887) (183,989) (177,365)
Noncontrolling interest - property partnerships [Member] | Boston [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income (41,849) (40,109) (33,862)
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 (121,038) (143,432) (143,562)
Noncontrolling interest - property partnerships [Member] | San Francisco [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 0 (448) 59
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 94,943 97,716 79,893
Total revenue [2] 319,560 322,817 271,951
Unconsolidated Joint Ventures [Member] | Boston [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 10,765 5,494 2,866
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 57,907 61,338 42,750
Unconsolidated Joint Ventures [Member] | New York [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income (5,326) 4,174 6,590
Unconsolidated Joint Ventures [Member] | San Francisco [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 14,928 0 0
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 16,669 26,710 27,687
Company's Share [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 1,626,131 1,739,850 1,551,842
Company's Share [Member] | Boston [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 550,902 561,501 510,009
Company's Share [Member] | Los Angeles [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 57,907 61,338 42,750
Company's Share [Member] | New York [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 424,849 483,122 444,086
Company's Share [Member] | San Francisco [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income 357,993 354,747 267,223
Company's Share [Member] | Washington, DC [Member]      
Segment Reporting Information [Line Items]      
Net Operating Income $ 234,480 $ 279,142 $ 287,774
[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] Includes straight-line rent adjustments of approximately $(10.1) million, $32.4 million and $15.9 million for the years ended December 31, 2020, 2019 and 2018, respectively. Due primarily to the impact of COVID-19, for the year ended December 31, 2020, write-offs of accounts receivable and accrued rent balances totaled approximately $51.7 million.