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Segment Information (Schedule Of Reconciliation Of Net Operating Income To Net Income) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Net income attributable to the Company's common shareholders / unitholders $ 862,227,000 $ 511,034,000 $ 572,347,000
Preferred dividends / distributions (10,500,000) (10,500,000) (10,500,000)
Noncontrolling interest-common units of the Operating Partnership (97,704,000) (59,345,000) (66,807,000)
Noncontrolling interest in property partnerships (48,260,000) (71,120,000) (62,909,000)
Interest expense (431,717,000) (412,717,000) (378,168,000)
Loss from early extinguishment of debt 0 29,540,000 16,490,000
Company's share of net operating income from joint ventures (1,694,075,000) (1,826,123,000) (1,649,314,000)
Depreciation and amortization expense (683,751,000) (677,764,000) (645,649,000)
Transaction costs (1,531,000) (1,984,000) (1,604,000)
General and administrative expense (133,112,000) (140,777,000) (121,722,000)
Gains (losses) from investments in securities (5,261,000) (6,417,000) 1,865,000
Interest and other income (loss) (5,953,000) (18,939,000) (10,823,000)
Gains on sales of real estate (618,982,000) (709,000) (182,356,000)
Income (loss) from unconsolidated joint ventures 85,110,000 (46,592,000) (2,222,000)
Business Intersegment, Eliminations [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Net income attributable to the Company's common shareholders / unitholders 862,227,000 511,034,000 572,347,000
Preferred dividends / distributions 10,500,000 10,500,000 10,500,000
Noncontrolling interest-common units of the Operating Partnership 97,704,000 59,345,000 66,807,000
Noncontrolling interest in property partnerships 48,260,000 71,120,000 62,909,000
Interest expense 431,717,000 412,717,000 378,168,000
Loss from early extinguishment of debt 0 29,540,000 16,490,000
Impairment loss 0 24,038,000 11,812,000
Depreciation and amortization expense 683,751,000 677,764,000 645,649,000
Transaction costs 1,531,000 1,984,000 1,604,000
Operating expense 11,626,000 10,386,000 9,590,000
General and administrative expense 133,112,000 140,777,000 121,722,000
Gains (losses) from investments in securities 5,261,000 6,417,000 (1,865,000)
Interest and other income (loss) 5,953,000 18,939,000 10,823,000
Gains on sales of real estate 618,982,000 709,000 182,356,000
Income (loss) from unconsolidated joint ventures (85,110,000) 46,592,000 2,222,000
Other revenue 11,626,000 10,386,000 9,590,000
Company's share of Net Operating Income 1,626,131,000 1,739,850,000 1,551,842,000
Unconsolidated Joint Ventures [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Interest expense (98,051,000) (84,409,000) (71,308,000)
Company's share of net operating income from joint ventures (94,943,000) (97,716,000) (79,893,000)
Depreciation and amortization expense (141,853,000) (102,296,000) (103,079,000) [1]
Transaction costs (1,027,000) (1,000,000) 0
Gains on sales of real estate (11,737,000) (32,706,000) [2] (16,951,000)
Income (loss) from unconsolidated joint ventures 85,110,000 (46,592,000) (2,222,000)
Unconsolidated Joint Ventures [Member] | Business Intersegment, Eliminations [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Company's share of net operating income from joint ventures 94,943,000 97,716,000 79,893,000
Boston Properties Limited Partnership      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Net income attributable to the Company's common shareholders / unitholders 979,979,000 580,102,000 656,903,000
Preferred dividends / distributions (10,500,000) (10,500,000) (10,500,000)
Noncontrolling interest in property partnerships (48,260,000) (71,120,000) (62,909,000)
Interest expense (431,717,000) (412,717,000) (378,168,000)
Loss from early extinguishment of debt 0 29,540,000 16,490,000
Depreciation and amortization expense (676,666,000) (669,956,000)  
Transaction costs (1,531,000) (1,984,000) (1,604,000)
General and administrative expense (133,112,000) (140,777,000) (121,722,000)
Gains (losses) from investments in securities (5,261,000) (6,417,000) 1,865,000
Interest and other income (loss) (5,953,000) (18,939,000) (10,823,000)
Gains on sales of real estate (631,945,000) (858,000) (190,716,000)
Income (loss) from unconsolidated joint ventures 85,110,000 (46,592,000) (2,222,000)
Boston Properties Limited Partnership | Business Intersegment, Eliminations [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Net income attributable to the Company's common shareholders / unitholders 979,979,000 580,102,000 656,903,000
Preferred dividends / distributions 10,500,000 10,500,000 10,500,000
Noncontrolling interest in property partnerships 48,260,000 71,120,000 62,909,000
Interest expense 431,717,000 412,717,000 378,168,000
Loss from early extinguishment of debt 0 29,540,000 16,490,000
Impairment loss 0 22,272,000 10,181,000
Depreciation and amortization expense 676,666,000 669,956,000 637,891,000
Transaction costs 1,531,000 1,984,000 1,604,000
Operating expense 11,626,000 10,386,000 9,590,000
General and administrative expense 133,112,000 140,777,000 121,722,000
Gains (losses) from investments in securities 5,261,000 6,417,000 (1,865,000)
Interest and other income (loss) 5,953,000 18,939,000 10,823,000
Gains on sales of real estate 631,945,000 858,000 190,716,000
Income (loss) from unconsolidated joint ventures (85,110,000) 46,592,000 2,222,000
Other revenue 11,626,000 10,386,000 9,590,000
Company's share of Net Operating Income 1,626,131,000 1,739,850,000 1,551,842,000
Management Service [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Other revenue (29,641,000) (40,039,000) (45,158,000)
Management Service [Member] | Business Intersegment, Eliminations [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Other revenue 29,641,000 40,039,000 45,158,000
Management Service [Member] | Boston Properties Limited Partnership      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Other revenue (29,641,000) (40,039,000) (45,158,000)
Management Service [Member] | Boston Properties Limited Partnership | Business Intersegment, Eliminations [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Other revenue 29,641,000 40,039,000 45,158,000
Noncontrolling interest - property partnerships [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Company's share of net operating income from joint ventures 162,887,000 183,989,000 177,365,000
Noncontrolling interest - property partnerships [Member] | Business Intersegment, Eliminations [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Company's share of net operating income from joint ventures 162,887,000 183,989,000 177,365,000
Noncontrolling interest - property partnerships [Member] | Boston Properties Limited Partnership | Business Intersegment, Eliminations [Member]      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Company's share of net operating income from joint ventures $ 162,887,000 $ 183,989,000 $ 177,365,000
[1] During the year ended December 31, 2018, the joint venture that owns Metropolitan Square in Washington, DC, commenced a renovation project and recorded accelerated depreciation expense of approximately $22.4 million related to the remaining book value of the assets to be replaced. The Company’s share of the accelerated depreciation expense totaled approximately $4.5 million.
[2] For the year ended December 31, 2019, represents the gain on sale of 540 Madison Avenue recognized by the joint venture. During 2008, the Company recognized an other-than-temporary impairment loss on its investment in the unconsolidated joint venture resulting in a basis differential between the carrying value of the Company’s investment in the joint venture and the joint venture’s basis in the assets and liabilities of the property. As a result of the historical basis difference, the Company recognized a gain on sale of real estate totaling approximately $47.2 million for the year ended December 31, 2019, which consists of its share of the gain on sale reported by the joint venture as well as an adjustment for the basis differential. The gain on sale of real estate is included in Income from Unconsolidated Joint Ventures in the Company’s Consolidated Statements of Operations.