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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 704,873 $ 673,283 $ 2,090,997 $ 2,032,605
Rental Revenue: Residential [1] 10,894 9,718 29,832 29,076
Rental Revenue Total [1] $ 720,956 $ 683,091 $ 2,128,211 $ 2,068,695
Rental Revenue: % of Grand Totals 100.00% [1] 100.00% [1] 100.00% [1] 100.00%
Rental Expenses: Class A Office $ 252,236 $ 253,306 $ 746,273 $ 748,030
Rental Expenses: Residential 6,045 4,955 18,100 12,984
Rental Expenses: Total $ 262,227 $ 261,425 $ 772,366 $ 772,972
Rental Expenses: % Of Grand Totals 100.00% 100.00% 100.00% 100.00%
Net Operating Income $ 458,729 $ 421,666 $ 1,355,845 $ 1,295,723
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 $ 730,056 $ 693,268 $ 2,157,558 $ 2,100,597
Boston [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] 236,080 225,652 696,054 683,501
Rental Revenue: Residential [1] 3,418 3,043 9,594 10,512
Rental Revenue Total [1] $ 244,687 $ 228,785 $ 713,030 $ 701,027
Rental Revenue: % of Grand Totals 33.93% [1] 33.48% [1] 33.50% [1] 33.89%
Rental Expenses: Class A Office $ 82,697 $ 81,890 $ 240,743 $ 240,129
Rental Expenses: Residential 1,396 1,350 4,286 3,925
Rental Expenses: Total $ 88,039 $ 86,404 $ 253,022 $ 256,012
Rental Expenses: % Of Grand Totals 33.57% 33.05% 32.76% 33.12%
Net Operating Income $ 156,648 $ 142,381 $ 460,008 $ 445,015
Net Operating Income: % of Grand Totals 34.15% 33.77% 33.93% 34.35%
Company's Share of Net Operating Income: % of Grand Totals 34.30% 33.35% 33.88% 33.63%
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 0.00% [1] 0.00% [1] 0.00% [1] 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 2.78% 2.96% 2.98% 3.42%
New York [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 257,656 $ 239,535 $ 760,002 $ 699,063
Rental Revenue: Residential [1] 0 0 0 0
Rental Revenue Total [1] $ 257,656 $ 239,535 $ 760,002 $ 699,063
Rental Revenue: % of Grand Totals 35.74% [1] 35.07% [1] 35.71% [1] 33.79%
Rental Expenses: Class A Office $ 94,338 $ 97,904 $ 286,385 $ 285,411
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Total $ 94,338 $ 97,904 $ 286,385 $ 285,411
Rental Expenses: % Of Grand Totals 35.98% 37.46% 37.08% 36.92%
Net Operating Income $ 163,318 $ 141,631 $ 473,617 $ 413,652
Net Operating Income: % of Grand Totals 35.60% 33.58% 34.93% 31.92%
Company's Share of Net Operating Income: % of Grand Totals 29.06% 27.26% 28.35% 25.89%
San Francisco [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 125,340 $ 128,165 $ 382,119 $ 393,137
Rental Revenue: Residential [1] 806 23 1,817 23
Rental Revenue Total [1] $ 126,146 $ 128,188 $ 383,936 $ 393,160
Rental Revenue: % of Grand Totals 17.50% [1] 18.77% [1] 18.04% [1] 19.01%
Rental Expenses: Class A Office $ 43,582 $ 41,518 $ 124,785 $ 123,168
Rental Expenses: Residential 1,688 740 4,918 740
Rental Expenses: Total $ 45,270 $ 42,258 $ 129,703 $ 123,908
Rental Expenses: % Of Grand Totals 17.26% 16.16% 16.79% 16.03%
Net Operating Income $ 80,876 $ 85,930 $ 254,233 $ 269,252
Net Operating Income: % of Grand Totals 17.63% 20.38% 18.75% 20.78%
Company's Share of Net Operating Income: % of Grand Totals 19.39% 22.26% 20.50% 22.36%
Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 85,797 $ 79,931 $ 252,822 $ 256,904
Rental Revenue: Residential [1] 6,670 6,652 18,421 18,541
Rental Revenue Total [1] $ 92,467 $ 86,583 $ 271,243 $ 275,445
Rental Revenue: % of Grand Totals 12.83% [1] 12.68% [1] 12.75% [1] 13.31%
Rental Expenses: Class A Office $ 31,619 $ 31,994 $ 94,360 $ 99,322
Rental Expenses: Residential 2,961 2,865 8,896 8,319
Rental Expenses: Total $ 34,580 $ 34,859 $ 103,256 $ 107,641
Rental Expenses: % Of Grand Totals 13.19% 13.33% 13.37% 13.93%
Net Operating Income $ 57,887 $ 51,724 $ 167,987 $ 167,804
Net Operating Income: % of Grand Totals 12.62% 12.27% 12.39% 12.95%
Company's Share of Net Operating Income: % of Grand Totals 14.32% 14.17% 14.24% 14.70%
Seattle        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 0   $ 0  
Rental Revenue: Residential [1] 0   0  
Rental Revenue Total [1] $ 0   $ 0  
Rental Revenue: % of Grand Totals [1] 0.00%   0.00%  
Rental Expenses: Class A Office $ 0   $ 0  
Rental Expenses: Residential 0   0  
Rental Expenses: Total $ 0   $ 0  
Rental Expenses: % Of Grand Totals 0.00%   0.00%  
Net Operating Income $ 0   $ 0  
Net Operating Income: % of Grand Totals 0.00%   0.00%  
Company's Share of Net Operating Income: % of Grand Totals 0.15%   0.05%  
Hotel [Member]        
Segment Reporting Information [Line Items]        
Other revenue [1] $ 5,189 $ 90 $ 7,382 $ 7,014
Operating expense 3,946 3,164 7,993 11,958
Hotel [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Other revenue [1] 5,189 90 7,382 7,014
Operating expense 3,946 3,164 7,993 11,958
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
Hotel [Member] | Seattle        
Segment Reporting Information [Line Items]        
Other revenue [1] 0   0  
Operating expense 0   0  
Noncontrolling interest - property partnerships [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income (47,800) (42,160) (138,463) (122,248)
Noncontrolling interest - property partnerships [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income (10,841) (10,228) (31,641) (31,467)
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 (36,959) (31,932) (106,822) (90,781)
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] | Washington, DC [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  
Unconsolidated Joint Ventures [Member]        
Segment Reporting Information [Line Items]        
Total revenue [2] 90,009 87,724 268,501 270,490
Unconsolidated Joint Ventures [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 3,464 2,764 9,369 8,490
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 12,078 11,953 38,535 42,909
Unconsolidated Joint Ventures [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 104 539 (517) 2,110
Unconsolidated Joint Ventures [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 3,502 4,098 10,562 11,384
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 4,447 5,584 15,858 16,714
Unconsolidated Joint Ventures [Member] | Seattle        
Segment Reporting Information [Line Items]        
Net Operating Income 671   671  
Company's Share [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 435,195 404,444 1,291,860 1,255,082
Company's Share [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 149,271 134,917 437,736 422,038
Company's Share [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 12,078 11,953 38,535 42,909
Company's Share [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 126,463 110,238 366,278 324,981
Company's Share [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 84,378 90,028 264,795 280,636
Company's Share [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 62,334 $ 57,308 183,845 $ 184,518
Company's Share [Member] | Seattle        
Segment Reporting Information [Line Items]        
Net Operating Income $ 671   $ 671  
[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 $5.5 million and $3.8 million for the three months ended September 30, 2021 and 2020, respectively, and approximately $11.6 million and $22.0 million for the nine months ended September 30, 2021 and 2020, respectively.