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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 735,333 $ 692,544 $ 1,462,221 $ 1,386,124
Rental Revenue: Residential [1] 16,912 9,763 29,878 18,938
Rental Revenue Total [1] $ 764,334 $ 703,868 $ 1,508,745 $ 1,407,255
Rental Revenue: % of Grand Totals 100.00% 100.00% 100.00% 100.00%
Rental Expenses: Class A Office $ 264,030 $ 242,775 $ 527,853 $ 494,037
Rental Expenses: Residential 9,818 5,928 16,250 12,055
Rental Expenses: Total $ 280,292 $ 250,699 $ 555,387 $ 510,139
Rental Expenses: % Of Grand Totals 100.00% 100.00% 100.00% 100.00%
Net Operating Income $ 484,042 $ 453,169 $ 953,358 $ 897,116
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%
Boston [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 244,936 $ 229,571 $ 487,014 $ 459,974
Rental Revenue: Residential [1] 3,748 3,131 7,344 6,176
Rental Revenue Total [1] $ 260,773 $ 234,263 $ 511,004 $ 468,343
Rental Revenue: % of Grand Totals 34.11% 33.28% 33.87% 33.28%
Rental Expenses: Class A Office $ 87,027 $ 78,165 $ 177,555 $ 158,046
Rental Expenses: Residential 1,492 1,435 2,929 2,890
Rental Expenses: Total $ 94,963 $ 81,596 $ 191,768 $ 164,983
Rental Expenses: % Of Grand Totals 33.88% 32.55% 34.53% 32.34%
Net Operating Income $ 165,810 $ 152,667 $ 319,236 $ 303,360
Net Operating Income: % of Grand Totals 34.25% 33.69% 33.49% 33.82%
Company's Share of Net Operating Income: % of Grand Totals 34.44% 33.70% 33.70% 33.68%
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% 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 2.81% 2.84% 2.90% 3.09%
New York [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 254,264 $ 252,182 $ 511,134 $ 502,346
Rental Revenue: Residential [1] 0 0 0 0
Rental Revenue Total [1] $ 254,264 $ 252,182 $ 511,134 $ 502,346
Rental Revenue: % of Grand Totals 33.27% 35.84% 33.88% 35.70%
Rental Expenses: Class A Office $ 95,363 $ 92,662 $ 191,703 $ 192,047
Rental Expenses: Residential 0 0 0 0
Rental Expenses: Total $ 95,363 $ 92,662 $ 191,703 $ 192,047
Rental Expenses: % Of Grand Totals 34.02% 36.96% 34.52% 37.65%
Net Operating Income $ 158,901 $ 159,520 $ 319,431 $ 310,299
Net Operating Income: % of Grand Totals 32.83% 35.20% 33.51% 34.59%
Company's Share of Net Operating Income: % of Grand Totals 25.95% 28.68% 26.57% 27.99%
San Francisco [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 133,707 $ 126,181 $ 266,082 $ 256,779
Rental Revenue: Residential [1] 5,850 690 8,241 1,011
Rental Revenue Total [1] $ 139,557 $ 126,871 $ 274,323 $ 257,790
Rental Revenue: % of Grand Totals 18.26% 18.02% 18.18% 18.32%
Rental Expenses: Class A Office $ 45,201 $ 40,954 $ 88,609 $ 81,203
Rental Expenses: Residential 5,145 1,544 7,013 3,230
Rental Expenses: Total $ 50,346 $ 42,498 $ 95,622 $ 84,433
Rental Expenses: % Of Grand Totals 17.96% 16.95% 17.22% 16.55%
Net Operating Income $ 89,211 $ 84,373 $ 178,701 $ 173,357
Net Operating Income: % of Grand Totals 18.43% 18.62% 18.74% 19.32%
Company's Share of Net Operating Income: % of Grand Totals 19.58% 20.35% 19.87% 21.06%
Seattle        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 6,472   $ 6,472  
Rental Revenue: Residential [1] 0   0  
Rental Revenue Total [1] $ 6,472   $ 6,472  
Rental Revenue: % of Grand Totals 0.85%   0.43%  
Rental Expenses: Class A Office $ 1,680   $ 1,680  
Rental Expenses: Residential 0   0  
Rental Expenses: Total $ 1,680   $ 1,680  
Rental Expenses: % Of Grand Totals 0.60%   0.30%  
Net Operating Income $ 4,792   $ 4,792  
Net Operating Income: % of Grand Totals 0.99%   0.50%  
Company's Share of Net Operating Income: % of Grand Totals 1.43%   0.93%  
Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Rental Revenue: Class A Office [1] $ 95,954 $ 84,610 $ 191,519 $ 167,025
Rental Revenue: Residential [1] 7,314 5,942 14,293 11,751
Rental Revenue Total [1] $ 103,268 $ 90,552 $ 205,812 $ 178,776
Rental Revenue: % of Grand Totals 13.51% 12.86% 13.64% 12.70%
Rental Expenses: Class A Office $ 34,759 $ 30,994 $ 68,306 $ 62,741
Rental Expenses: Residential 3,181 2,949 6,308 5,935
Rental Expenses: Total $ 37,940 $ 33,943 $ 74,614 $ 68,676
Rental Expenses: % Of Grand Totals 13.54% 13.54% 13.43% 13.46%
Net Operating Income $ 65,328 $ 56,609 $ 131,198 $ 110,100
Net Operating Income: % of Grand Totals 13.50% 12.49% 13.76% 12.27%
Company's Share of Net Operating Income: % of Grand Totals 15.79% 14.43% 16.03% 14.18%
Hotel [Member]        
Segment Reporting Information [Line Items]        
Other revenue [1] $ 12,089 $ 1,561 $ 16,646 $ 2,193
Operating expense 6,444 1,996 11,284 4,047
Hotel [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Other revenue [1] 12,089 1,561 16,646 2,193
Operating expense 6,444 1,996 11,284 4,047
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] | Seattle        
Segment Reporting Information [Line Items]        
Other revenue [1] 0   0  
Operating expense 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 (47,862) (46,287) (94,917) (90,663)
Noncontrolling interest - property partnerships [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income (11,377) (10,576) (23,112) (20,800)
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 (36,485) (35,711) (71,805) (69,863)
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] | Seattle        
Segment Reporting Information [Line Items]        
Net Operating Income 0   0  
Noncontrolling interest - property partnerships [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 0 0 0 0
Unconsolidated Joint Ventures [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 8,134 3,624 17,827 5,905
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 13,247 12,265 27,004 26,457
Unconsolidated Joint Ventures [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 18 172 (138) (621)
Unconsolidated Joint Ventures [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 3,183 3,580 6,364 7,060
Unconsolidated Joint Ventures [Member] | Seattle        
Segment Reporting Information [Line Items]        
Net Operating Income 1,944   3,899  
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 9,184 5,776 18,075 11,411
Company's Share [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 471,890 432,299 931,472 856,665
Company's Share [Member] | Boston [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 162,567 145,715 313,951 288,465
Company's Share [Member] | Los Angeles [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 13,247 12,265 27,004 26,457
Company's Share [Member] | New York [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 122,434 123,981 247,488 239,815
Company's Share [Member] | San Francisco [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income 92,394 87,953 185,065 180,417
Company's Share [Member] | Seattle        
Segment Reporting Information [Line Items]        
Net Operating Income 6,736   8,691  
Company's Share [Member] | Washington, DC [Member]        
Segment Reporting Information [Line Items]        
Net Operating Income $ 74,512 $ 62,385 $ 149,273 $ 121,511
[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.