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Unsecured Senior Notes Schedule of Unsecured Senior Notes (Details) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2019

Sep. 03, 2019

Jun. 21, 2019

Dec. 31, 2018

Debt Instrument [Line Items]

Deferred finance costs, net

$ (26,700)

Total

8,390,459

$ 7,544,697

Boston Properties Limited Partnership

Debt Instrument [Line Items]

Deferred finance costs, net

(26,700)

Total

8,390,459

$ 7,544,697

Boston Properties Limited Partnership | Senior Notes [Member]

Debt Instrument [Line Items]

Principal Amount

8,450,000

Net unamortized discount

(17,451)

Deferred finance costs, net

(42,090)

Total

$ 8,390,459

Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 4.289%

Debt Instrument [Line Items]

Coupon/Stated Rate

4.125%

Effective Rate

^[1]

4.289%

Principal Amount

$ 850,000

Maturity date

^[2]

May 15, 2021

Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.954%

Debt Instrument [Line Items]

Coupon/Stated Rate

3.85%

Effective Rate

^[1]

3.954%

Principal Amount

$ 1,000,000

Maturity date

^[2]

Feb. 01, 2023

Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.279%

Debt Instrument [Line Items]

Coupon/Stated Rate

3.125%

Effective Rate

^[1]

3.279%

Principal Amount

$ 500,000

Maturity date

^[2]

Sep. 01, 2023

Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.916%

Debt Instrument [Line Items]

Coupon/Stated Rate

3.80%

Effective Rate

^[1]

3.916%

Principal Amount

$ 700,000

Maturity date

^[2]

Feb. 01, 2024

Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Notes 3.35%

Debt Instrument [Line Items]

Coupon/Stated Rate

3.20%

Effective Rate

^[1]

3.35%

Principal Amount

$ 850,000

Maturity date

^[2]

Jan. 15, 2025

Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Note 3.766%

Debt Instrument [Line Items]

Coupon/Stated Rate

3.65%

Effective Rate

^[1]

3.766%

Principal Amount

$ 1,000,000

Maturity date

^[2]

Feb. 01, 2026

Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Note 3.495%

Debt Instrument [Line Items]

Coupon/Stated Rate

2.75%

Effective Rate

^[1]

3.495%

Principal Amount

$ 1,000,000

Maturity date

^[2]

Oct. 01, 2026

Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Note 4.628%

Debt Instrument [Line Items]

Coupon/Stated Rate

4.50%

Effective Rate

^[1]

4.628%

Principal Amount

$ 1,000,000

Maturity date

^[2]

Dec. 01, 2028

Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Note 3.505%

Debt Instrument [Line Items]

Coupon/Stated Rate

3.40%

3.40%

Effective Rate

3.505%

^[1]

3.505%

Principal Amount

$ 850,000

$ 850,000

Maturity date

^[2]

Jun. 21, 2029

Boston Properties Limited Partnership | Senior Notes [Member] | Unsecured Senior Note 2.984%

Debt Instrument [Line Items]

Coupon/Stated Rate

2.90%

2.90%

Effective Rate

2.984%

^[1]

2.984%

Principal Amount

$ 700,000

$ 700,000

Maturity date

^[2]

Mar. 15, 2030

[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.

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