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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 673,283 $ 707,811 $ 2,032,605 $ 2,101,762
Rental Revenue: Residential [1] 9,718 9,996 29,076 26,710
Rental Revenue Total [1] $ 683,091 $ 730,821 $ 2,068,695 $ 2,165,268
Rental Revenue: % of Grand Totals [1] 100.00% 100.00% 100.00% 100.00%
Rental Expenses: Class A Office $ 253,306 $ 261,592 $ 748,030 $ 769,184
Rental Expenses: Residential 4,955 4,011 12,984 11,907
Rental Expenses: Total $ 261,425 $ 274,346 $ 772,972 $ 806,777
Rental Expenses: % Of Grand Totals 100.00% 100.00% 100.00% 100.00%
Net Operating Income $ 421,666 $ 456,475 $ 1,295,723 $ 1,358,491
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%
Total revenue $ 693,268 $ 743,553 $ 2,100,597 $ 2,203,061
Boston [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] 225,652 224,345 683,501 659,717
Rental Revenue: Residential [1] 3,043 3,809 10,512 9,732
Rental Revenue Total [1] $ 228,785 $ 241,168 $ 701,027 $ 706,245
Rental Revenue: % of Grand Totals [1] 33.48% 33.00% 33.89% 32.62%
Rental Expenses: Class A Office $ 81,890 $ 81,278 $ 240,129 $ 238,438
Rental Expenses: Residential 1,350 1,244 3,925 3,729
Rental Expenses: Total $ 86,404 $ 91,265 $ 256,012 $ 267,853
Rental Expenses: % Of Grand Totals 33.05% 33.27% 33.12% 33.20%
Net Operating Income $ 142,381 $ 149,903 $ 445,015 $ 438,392
Net Operating Income: % of Grand Totals 33.77% 32.84% 34.35% 32.27%
Company's Share of Net Operating Income: % of Grand Totals 33.35% 32.60% 33.63% 31.87%
Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 0 $ 0 $ 0 $ 0
Rental Revenue: Residential [1] 0 0 0 0
Rental Revenue Total [1] $ 0 $ 0 $ 0 $ 0
Rental Revenue: % of Grand Totals [1] 0.00% 0.00% 0.00% 0.00%
Rental Expenses: Class A Office $ 0 $ 0 $ 0 $ 0
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Total $ 0 $ 0 $ 0 $ 0
Rental Expenses: % Of Grand Totals 0.00% 0.00% 0.00% 0.00%
Net Operating Income $ 0 $ 0 $ 0 $ 0
Net Operating Income: % of Grand Totals 0.00% 0.00% 0.00% 0.00%
Company's Share of Net Operating Income: % of Grand Totals 2.96% 3.39% 3.42% 3.55%
New York [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 239,535 $ 251,806 $ 699,063 $ 761,993
Rental Revenue: Residential [1] 0 0 0 0
Rental Revenue Total [1] $ 239,535 $ 251,806 $ 699,063 $ 761,993
Rental Revenue: % of Grand Totals [1] 35.07% 34.45% 33.79% 35.19%
Rental Expenses: Class A Office $ 97,904 $ 98,698 $ 285,411 $ 292,478
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Total $ 97,904 $ 98,698 $ 285,411 $ 292,478
Rental Expenses: % Of Grand Totals 37.46% 35.97% 36.92% 36.26%
Net Operating Income $ 141,631 $ 153,108 $ 413,652 $ 469,515
Net Operating Income: % of Grand Totals 33.58% 33.54% 31.92% 34.56%
Company's Share of Net Operating Income: % of Grand Totals 27.26% 27.05% 25.89% 28.18%
San Francisco [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 128,165 $ 136,290 $ 393,137 $ 391,851
Rental Revenue: Residential [1] 23 0 23 0
Rental Revenue Total [1] $ 128,188 $ 136,290 $ 393,160 $ 391,851
Rental Revenue: % of Grand Totals [1] 18.77% 18.65% 19.01% 18.10%
Rental Expenses: Class A Office $ 41,518 $ 45,900 $ 123,168 $ 130,733
Rental Expenses: Residential 740 0 740 0
Rental Expenses: Total $ 42,258 $ 45,900 $ 123,908 $ 130,733
Rental Expenses: % Of Grand Totals 16.16% 16.73% 16.03% 16.20%
Net Operating Income $ 85,930 $ 90,390 $ 269,252 $ 261,118
Net Operating Income: % of Grand Totals 20.38% 19.80% 20.78% 19.22%
Company's Share of Net Operating Income: % of Grand Totals 22.26% 20.86% 22.36% 20.16%
Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 79,931 $ 95,370 $ 256,904 $ 288,201
Rental Revenue: Residential [1] 6,652 6,187 18,541 16,978
Rental Revenue Total [1] $ 86,583 $ 101,557 $ 275,445 $ 305,179
Rental Revenue: % of Grand Totals [1] 12.68% 13.90% 13.31% 14.09%
Rental Expenses: Class A Office $ 31,994 $ 35,716 $ 99,322 $ 107,535
Rental Expenses: Residential 2,865 2,767 8,319 8,178
Rental Expenses: Total $ 34,859 $ 38,483 $ 107,641 $ 115,713
Rental Expenses: % Of Grand Totals 13.33% 14.03% 13.93% 14.34%
Net Operating Income $ 51,724 $ 63,074 $ 167,804 $ 189,466
Net Operating Income: % of Grand Totals 12.27% 13.82% 12.95% 13.95%
Company's Share of Net Operating Income: % of Grand Totals 14.17% 16.10% 14.70% 16.24%
Hotel [Member]        
Segment Reporting Information [Line Items]        
Other revenue [1] $ 90 $ 13,014 $ 7,014 $ 36,796
Operating expense 3,164 8,743 11,958 25,686
Hotel [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Other revenue [1] 90 13,014 7,014 36,796
Operating expense 3,164 8,743 11,958 25,686
Hotel [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Other revenue [1] 0 0 0 0
Operating expense 0 0 0 0
Hotel [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Other revenue [1] 0 0 0 0
Operating expense 0 0 0 0
Hotel [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Other revenue [1] 0 0 0 0
Operating expense 0 0 0 0
Hotel [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Other revenue [1] 0 0 0 0
Operating expense 0 0 0 0
Noncontrolling interest - property partnerships [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income (42,160) (46,249) (122,248) (138,896)
Noncontrolling interest - property partnerships [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income (10,228) (10,379) (31,467) (29,783)
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 (31,932) (35,870) (90,781) (108,665)
Noncontrolling interest - property partnerships [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 0 0 0 (448)
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 24,938 23,065 81,607 73,129
Total revenue [2] 87,724 75,940 270,490 239,099
Unconsolidated Joint Ventures [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 2,764 1,686 8,490 3,276
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 11,953 14,702 42,909 45,864
Unconsolidated Joint Ventures [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 539 (27) 2,110 3,455
Unconsolidated Joint Ventures [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 4,098 0 11,384 0
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 5,584 6,704 16,714 20,534
Company's Share [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 404,444 433,291 1,255,082 1,292,724
Company's Share [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 134,917 141,210 422,038 411,885
Company's Share [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 11,953 14,702 42,909 45,864
Company's Share [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 110,238 117,211 324,981 364,305
Company's Share [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 90,028 90,390 280,636 260,670
Company's Share [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income $ 57,308 $ 69,778 $ 184,518 $ 210,000
[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 $3.8 million and $5.3 million for the three months ended September 30, 2020 and 2019, respectively, and $22.0 million and $18.7 million for the nine months ended September 30, 2020 and 2019, respectively.