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Real Estate (Narrative) (Details) $ in Thousands |  |  |  |  |  | 5 Months Ended | 7 Months Ended | 10 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Dec. 14, 2021 USD ($) ft² shares | Oct. 25, 2021 USD ($) ft² Buildings | Aug. 02, 2021 USD ($) ft² a Buildings | Jun. 02, 2021 USD ($) ft² Buildings | Apr. 19, 2021 USD ($) a ft² | Dec. 31, 2021 USD ($) | Dec. 31, 2021 USD ($) | Oct. 24, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 15, 2021 | Dec. 08, 2021 ft² | Dec. 03, 2021 ft² | Oct. 19, 2021 ft² | Apr. 16, 2021 ft² | Feb. 25, 2021 ft² | Feb. 01, 2021 ft²
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumption of mortgage notes payable |  |  |  |  |  |  |  |  | $ 200,311 | $ 0 | $ 0 |  |  |  |  |  |  |
Issuance of operating partnership units for 360 Park Avenue South |  |  |  |  |  |  |  |  | 99,689 | 0 | 0 |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  | $ 3,267,914 | $ 3,267,914 |  | 3,267,914 | 2,909,081 |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 2,888,621 | 2,765,686 | 2,960,562 |  |  |  |  |  |  |
Proceeds from sales of real estate |  |  |  |  |  |  |  |  | 179,887 | 519,303 | 90,824 |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 631,932 | 1,018,691 | 651,999 |  |  |  |  |  |  |
153 & 211 Second Avenue [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate |  |  |  | $ 100,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | Buildings |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leased percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  | 137,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  | 5,500 |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |  | (2,100) |  |  |  |  |  |  |  |  |  |  |
Shady Grove Innovation District [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Real Estate |  |  | $ 118,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  | 435,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of buildings | Buildings |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  | 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  | 1,200 |  |  |  |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  | (1,500) |  |  |  |  |  |  |  |  |  |  |  |
360 Park South Avenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² | 450,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of floors | 20 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisition, Value of Assets Acquired | $ 300,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumption of mortgage notes payable | 200,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of operating partnership units for 360 Park Avenue South | 99,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
number of investors |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  | 42.21% |  |  |  |  |  |
Debt - Total loan amount | $ 220,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
11251 Roger Bacon Drive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leased percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  | 65,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Area of Land | a |  |  |  |  | 2.6 |  |  |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition, Price of Acquisition, Expected |  |  |  |  | $ 5,600 |  |  |  |  |  |  |  |  |  |  |  |  |
One Five Nine East 53rd Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 220,000
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55.00%
3625 - 3635 Peterson Way |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 218,000 |  |
Reston Next |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100,000 |  |  |
200 West Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  | 138,000 |  |  |  |
6595 Springfield Center Drive |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  |  |  |  |  |  |  |  | 8,100 |  |  |  |  |  |  |  |  |
181, 191 and 201 Spring Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties | Buildings |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  | 333,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Sales Price |  | $ 191,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sales of real estate |  | 179,900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  | 115,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  | $ 5,700 |  | 7,200 | 7,000 |  |  |  |  |  |  |
Construction in Progress | 180 CityPoint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 329,000 |
Construction in Progress | 880 Winter Street [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 224,000 |
Construction in Progress | The Prudential Center Observatory |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 59,000 |
Construction in Progress | 103 CityPoint |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Rentable Area (in sf) | ft² |  |  |  |  |  |  |  |  |  |  |  |  | 113,000 |  |  |  |  |
Boston Properties Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assumption of mortgage notes payable |  |  |  |  |  |  |  |  | 200,311 | 0 | 0 |  |  |  |  |  |  |
Issuance of operating partnership units for 360 Park Avenue South |  |  |  |  |  |  |  |  | 99,689 | 0 | 0 |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  | $ 3,267,914 | $ 3,267,914 |  | 3,267,914 | 2,909,081 |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  | 2,888,621 | 2,765,686 | 2,960,562 |  |  |  |  |  |  |
Proceeds from sales of real estate |  |  |  |  |  |  |  |  | 179,887 | 519,303 | 90,824 |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | $ 641,771 | $ 1,038,739 | $ 661,722 |  |  |  |  |  |  |
Boston Properties Limited Partnership | 360 Park South Avenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued | shares | 866,503 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Boston Properties Limited Partnership | 181, 191 and 201 Spring Street |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Sales of Investment Real Estate |  | $ 117,100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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