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Unsecured Senior Notes | 9 Months Ended
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Sep. 30, 2019
Debt Disclosure [Abstract] |
Unsecured Senior Notes | 6. Unsecured Senior Notes The following summarizes the unsecured senior notes outstanding as of September 30, 2019 (dollars in thousands):
| Coupon/Stated Rate |  | Effective Rate(1) |  | Principal Amount |  | Maturity Date(2)
10 Year Unsecured Senior Notes | 4.125 | % |  | 4.289 | % |  | $ | 850,000 |  |  | May 15, 2021
11 Year Unsecured Senior Notes | 3.850 | % |  | 3.954 | % |  | 1,000,000 |  |  | February 1, 2023
10.5 Year Unsecured Senior Notes | 3.125 | % |  | 3.279 | % |  | 500,000 |  |  | September 1, 2023
10.5 Year Unsecured Senior Notes | 3.800 | % |  | 3.916 | % |  | 700,000 |  |  | February 1, 2024
7 Year Unsecured Senior Notes | 3.200 | % |  | 3.350 | % |  | 850,000 |  |  | January 15, 2025
10 Year Unsecured Senior Notes | 3.650 | % |  | 3.766 | % |  | 1,000,000 |  |  | February 1, 2026
10 Year Unsecured Senior Notes | 2.750 | % |  | 3.495 | % |  | 1,000,000 |  |  | October 1, 2026
10 Year Unsecured Senior Notes | 4.500 | % |  | 4.628 | % |  | 1,000,000 |  |  | December 1, 2028
10 Year Unsecured Senior Notes | 3.400 | % |  | 3.505 | % |  | 850,000 |  |  | June 21, 2029
10.5 Year Unsecured Senior Notes | 2.900 | % |  | 2.984 | % |  | 700,000 |  |  | March 15, 2030
Total principal |  |  |  |  | 8,450,000 |  |  |
Net unamortized discount |  |  |  |  | (18,232 | ) |  |
Deferred financing costs, net |  |  |  |  | (43,855 | ) |  |
Total |  |  |  |  | $ | 8,387,913 |  |  |
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(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.
On June 21, 2019, Boston Properties Limited Partnership completed a public offering of $850.0 million in aggregate principal amount of its 3.400% unsecured senior notes due 2029. The notes were priced at 99.815% of the principal amount to yield an effective rate (including financing fees) of approximately 3.505% per annum to maturity. The notes will mature on June 21, 2029, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $841.4 million after deducting underwriting discounts and transaction expenses. On September 3, 2019, Boston Properties Limited Partnership completed a public offering of $700.0 million in aggregate principal amount of its 2.900% unsecured senior notes due 2030. The notes were priced at 99.954% of the principal amount to yield an effective rate (including financing fees) of approximately 2.984% per annum to maturity. The notes will mature on March 15, 2030, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $693.8 million after deducting underwriting discounts and transaction expenses. On September 18, 2019, Boston Properties Limited Partnership completed the redemption of $700.0 million in aggregate principal amount of its 5.625% senior notes due November 15, 2020. The redemption price was approximately $740.7 million. The redemption price included approximately $13.5 million of accrued and unpaid interest to, but not including, the redemption date. Excluding the accrued and unpaid interest, the redemption price was approximately 103.90% of the principal amount being redeemed. The Company recognized a loss from early extinguishment of debt totaling approximately $28.0 million, which amount included the payment of the redemption premium totaling approximately $27.3 million. The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50 and (4) an unencumbered asset value of not less than 150% of unsecured debt. At September 30, 2019, Boston Properties Limited Partnership was in compliance with each of these financial restrictions and requirements.

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- Definition The entire disclosure for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -URI http://asc.fasb.org/topic&trid=2208564 + Details
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