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Unsecured Senior Notes Unsecured Senior Notes | 3 Months Ended
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Mar. 31, 2016
Debt Disclosure [Abstract] |
Unsecured Senior Notes | 5. Unsecured Senior Notes The following summarizes the unsecured senior notes outstanding as of March 31, 2016 (dollars in thousands):
| Coupon/ Stated Rate |  | Effective Rate(1) |  | Principal Amount |  | Maturity Date(2) |
10 Year Unsecured Senior Notes | 5.875 | % |  | 5.967 | % |  | $ | 700,000 |  |  | October 15, 2019 |
10 Year Unsecured Senior Notes | 5.625 | % |  | 5.708 | % |  | 700,000 |  |  | November 15, 2020 |
10 Year Unsecured Senior Notes | 4.125 | % |  | 4.289 | % |  | 850,000 |  |  | May 15, 2021 |
7 Year Unsecured Senior Notes | 3.700 | % |  | 3.853 | % |  | 850,000 |  |  | November 15, 2018 |
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 |
10 Year Unsecured Senior Notes | 3.650 | % |  | 3.766 | % |  | 1,000,000 |  |  | February 1, 2026 |
Total principal |  |  |  |  | 6,300,000 |  |  |  |
Net unamortized discount |  |  |  |  | (13,148 | ) |  |  |
Deferred financing costs, net |  |  |  |  | (31,250 | ) |  |  |
Total |  |  |  |  | $ | 6,255,602 |  |  |  |
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(1) | Yield on issuance date including the effects of discounts on the notes and the amortization of financing costs.
(2) | No principal amounts are due prior to maturity.
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 March 31, 2016, Boston Properties Limited Partnership was in compliance with each of these financial restrictions and requirements. On January 20, 2016, Boston Properties Limited Partnership completed a public offering of $1.0 billion in aggregate principal amount of its 3.650% senior unsecured notes due 2026. The notes were priced at 99.708% of the principal amount to yield an effective rate (including financing fees) of 3.766% to maturity. The notes will mature on February 1, 2026, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $988.9 million after deducting underwriting discounts and transaction expenses.

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