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v3.20.4

Schedule of Unsecured Senior Notes (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | May 05, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Debt Issuance Costs, Net |  | $ (22,905) |  |  |
Senior Notes |  | 9,639,287 |  |  | $ 8,390,459
Boston Properties Limited Partnership |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Issuance Costs, Net |  | (22,900) |  |  |
Senior Notes |  | 9,639,287 |  |  | $ 8,390,459
Boston Properties Limited Partnership | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt |  | 9,700,000 |  |  |
Debt Instrument, Unamortized Discount |  | (16,034) |  |  |
Debt Issuance Costs, Net |  | (44,679) |  |  |
Senior Notes |  | $ 9,639,287 |  |  |
Boston Properties Limited Partnership | Senior Notes | 4.289% unsecured senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.125% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [1] | 4.289% |  |  |
Debt |  | $ 850,000 |  |  |
Long-term Debt, Maturity Date | [2],[3] | May 15, 2021 |  |  |
Boston Properties Limited Partnership | Senior Notes | 3.954% unsecured senior notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.85% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [1] | 3.954% |  |  |
Debt |  | $ 1,000,000 |  |  |
Long-term Debt, Maturity Date | [2] | Feb. 01, 2023 |  |  |
Boston Properties Limited Partnership | Senior Notes | 3.279% unsecured senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.125% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [1] | 3.279% |  |  |
Debt |  | $ 500,000 |  |  |
Long-term Debt, Maturity Date | [2] | Sep. 01, 2023 |  |  |
Boston Properties Limited Partnership | Senior Notes | 3.916% unsecured senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.80% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [1] | 3.916% |  |  |
Debt |  | $ 700,000 |  |  |
Long-term Debt, Maturity Date | [2] | Feb. 01, 2024 |  |  |
Boston Properties Limited Partnership | Senior Notes | 3.350% unsecured senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.20% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [1] | 3.35% |  |  |
Debt |  | $ 850,000 |  |  |
Long-term Debt, Maturity Date | [2] | Jan. 15, 2025 |  |  |
Boston Properties Limited Partnership | Senior Notes | 3.766% unsecured senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.65% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [1] | 3.766% |  |  |
Debt |  | $ 1,000,000 |  |  |
Long-term Debt, Maturity Date | [2] | Feb. 01, 2026 |  |  |
Boston Properties Limited Partnership | Senior Notes | 3.495% unsecured senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.75% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [1] | 3.495% |  |  |
Debt |  | $ 1,000,000 |  |  |
Long-term Debt, Maturity Date | [2] | Oct. 01, 2026 |  |  |
Boston Properties Limited Partnership | Senior Notes | 4.628% unsecured senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.50% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [1] | 4.628% |  |  |
Debt |  | $ 1,000,000 |  |  |
Long-term Debt, Maturity Date | [2] | Dec. 01, 2028 |  |  |
Boston Properties Limited Partnership | Senior Notes | 3.505% unsecured senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.40% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [1] | 3.505% |  |  |
Debt |  | $ 850,000 |  |  |
Long-term Debt, Maturity Date | [2] | Jun. 21, 2029 |  |  |
Boston Properties Limited Partnership | Senior Notes | 2.984% unsecured senior notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 2.90% |  |  |
Debt Instrument, Interest Rate, Effective Percentage | [1] | 2.984% |  |  |
Debt |  | $ 700,000 |  |  |
Long-term Debt, Maturity Date | [2] | Mar. 15, 2030 |  |  |
Boston Properties Limited Partnership | Senior Notes | 3.343 % unsecured senior notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.25% |  | 3.25% |
Debt Instrument, Interest Rate, Effective Percentage |  | 3.343% | [1] | 3.343% |
Debt |  | $ 1,250,000 |  | $ 1,250,000 |
Long-term Debt, Maturity Date | [2] | Jan. 30, 2031 |  |  |
[1] | Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.
[2] | No principal amounts are due prior to maturity.
[3] | See Note 18

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