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Segment Information (Schedule Of Segment Reporting By Geographic Area And Property Type) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Rental Revenue: Office $ 828,996 $ 808,122
Rental Revenue: Residential 12,348 12,684
Rental Revenue Total $ 850,941 $ 828,992
Rental Revenue: % of Grand Totals 100.00% 100.00%
Rental Expenses: Office $ 325,681 $ 308,471
Rental Expenses: Residential 5,897 5,686
Rental Expenses: Total $ 339,143 $ 320,172
Rental Expenses: % Of Grand Totals 100.00% 100.00%
Net Operating Income $ 511,798 $ 508,820
Net Operating Income: % of Grand Totals 100.00% 100.00%
Company's Share of Net Operating Income: % of Grand Totals 100.00% 100.00%
Boston [Member]    
Segment Reporting Information [Line Items]    
Rental Revenue: Office $ 305,289 $ 280,466
Rental Revenue: Residential 4,129 4,196
Rental Revenue Total $ 319,015 $ 292,848
Rental Revenue: % of Grand Totals 37.48% 35.33%
Rental Expenses: Office $ 116,885 $ 105,171
Rental Expenses: Residential 1,808 1,593
Rental Expenses: Total $ 126,258 $ 112,779
Rental Expenses: % Of Grand Totals 37.23% 35.23%
Net Operating Income $ 192,757 $ 180,069
Net Operating Income: % of Grand Totals 37.66% 35.39%
Company's Share of Net Operating Income: % of Grand Totals 37.58% 35.71%
Los Angeles [Member]    
Segment Reporting Information [Line Items]    
Rental Revenue: Office $ 17,165 $ 20,401
Rental Revenue: Residential 0 0
Rental Revenue Total $ 17,165 $ 20,401
Rental Revenue: % of Grand Totals 2.02% 2.46%
Rental Expenses: Office $ 6,496 $ 6,567
Rental Expenses: Residential 0 0
Rental Expenses: Total $ 6,496 $ 6,567
Rental Expenses: % Of Grand Totals 1.92% 2.05%
Net Operating Income $ 10,669 $ 13,834
Net Operating Income: % of Grand Totals 2.08% 2.72%
Company's Share of Net Operating Income: % of Grand Totals 3.64% 4.24%
New York [Member]    
Segment Reporting Information [Line Items]    
Rental Revenue: Office $ 263,425 $ 260,809
Rental Revenue: Residential 0 0
Rental Revenue Total $ 263,425 $ 260,809
Rental Revenue: % of Grand Totals 30.96% 31.46%
Rental Expenses: Office $ 109,961 $ 107,481
Rental Expenses: Residential 0 0
Rental Expenses: Total $ 109,961 $ 107,481
Rental Expenses: % Of Grand Totals 32.42% 33.57%
Net Operating Income $ 153,464 $ 153,328
Net Operating Income: % of Grand Totals 29.99% 30.13%
Company's Share of Net Operating Income: % of Grand Totals 24.77% 24.88%
San Francisco [Member]    
Segment Reporting Information [Line Items]    
Rental Revenue: Office $ 125,808 $ 132,614
Rental Revenue: Residential 3,503 3,958
Rental Revenue Total $ 129,311 $ 136,572
Rental Revenue: % of Grand Totals 15.20% 16.47%
Rental Expenses: Office $ 48,552 $ 46,942
Rental Expenses: Residential 2,140 2,218
Rental Expenses: Total $ 50,692 $ 49,160
Rental Expenses: % Of Grand Totals 14.95% 15.35%
Net Operating Income $ 78,619 $ 87,412
Net Operating Income: % of Grand Totals 15.36% 17.18%
Company's Share of Net Operating Income: % of Grand Totals 16.82% 18.60%
Seattle    
Segment Reporting Information [Line Items]    
Rental Revenue: Office $ 11,991 $ 10,910
Rental Revenue: Residential 0 0
Rental Revenue Total $ 11,991 $ 10,910
Rental Revenue: % of Grand Totals 1.41% 1.32%
Rental Expenses: Office $ 2,996 $ 3,081
Rental Expenses: Residential 0 0
Rental Expenses: Total $ 2,996 $ 3,081
Rental Expenses: % Of Grand Totals 0.88% 0.96%
Net Operating Income $ 8,995 $ 7,829
Net Operating Income: % of Grand Totals 1.76% 1.54%
Company's Share of Net Operating Income: % of Grand Totals 2.27% 1.95%
Washington, DC [Member]    
Segment Reporting Information [Line Items]    
Rental Revenue: Office $ 105,318 $ 102,922
Rental Revenue: Residential 4,716 4,530
Rental Revenue Total $ 110,034 $ 107,452
Rental Revenue: % of Grand Totals 12.93% 12.96%
Rental Expenses: Office $ 40,791 $ 39,229
Rental Expenses: Residential 1,949 1,875
Rental Expenses: Total $ 42,740 $ 41,104
Rental Expenses: % Of Grand Totals 12.60% 12.84%
Net Operating Income $ 67,294 $ 66,348
Net Operating Income: % of Grand Totals 13.15% 13.04%
Company's Share of Net Operating Income: % of Grand Totals 14.92% 14.62%
Hotel [Member]    
Segment Reporting Information [Line Items]    
Other revenue $ 9,597 $ 8,186
Operating expense 7,565 6,015
Hotel [Member] | Boston [Member]    
Segment Reporting Information [Line Items]    
Other revenue 9,597 8,186
Operating expense 7,565 6,015
Hotel [Member] | Los Angeles [Member]    
Segment Reporting Information [Line Items]    
Other revenue 0 0
Operating expense 0 0
Hotel [Member] | New York [Member]    
Segment Reporting Information [Line Items]    
Other revenue 0 0
Operating expense 0 0
Hotel [Member] | San Francisco [Member]    
Segment Reporting Information [Line Items]    
Other revenue 0 0
Operating expense 0 0
Hotel [Member] | Seattle    
Segment Reporting Information [Line Items]    
Other revenue 0 0
Operating expense 0 0
Hotel [Member] | Washington, DC [Member]    
Segment Reporting Information [Line Items]    
Other revenue 0 0
Operating expense 0 0
Noncontrolling interest - property partnerships [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income (49,702) (46,570)
Noncontrolling interest - property partnerships [Member] | Boston [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income (15,301) (11,056)
Noncontrolling interest - property partnerships [Member] | Los Angeles [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 0 0
Noncontrolling interest - property partnerships [Member] | New York [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income (34,401) (35,514)
Noncontrolling interest - property partnerships [Member] | San Francisco [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 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
Unconsolidated Joint Ventures [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 32,682 35,430
Unconsolidated Joint Ventures [Member] | Boston [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 8,451 8,757
Unconsolidated Joint Ventures [Member] | Los Angeles [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 7,352 7,248
Unconsolidated Joint Ventures [Member] | New York [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 3,513 5,984
Unconsolidated Joint Ventures [Member] | San Francisco [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 4,581 5,154
Unconsolidated Joint Ventures [Member] | Seattle    
Segment Reporting Information [Line Items]    
Net Operating Income 2,257 1,876
Unconsolidated Joint Ventures [Member] | Washington, DC [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 6,528 6,411
Company's Share [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 494,778 497,680
Company's Share [Member] | Boston [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 185,907 177,770
Company's Share [Member] | Los Angeles [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 18,021 21,082
Company's Share [Member] | New York [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 122,576 123,798
Company's Share [Member] | San Francisco [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income 83,200 92,566
Company's Share [Member] | Seattle    
Segment Reporting Information [Line Items]    
Net Operating Income 11,252 9,705
Company's Share [Member] | Washington, DC [Member]    
Segment Reporting Information [Line Items]    
Net Operating Income $ 73,822 $ 72,759