7. Unsecured Senior Notes

The following summarizes the unsecured senior notes outstanding as of December 31, 2018 (dollars in thousands):



	Coupon/ Stated Rate		Effective Rate(1)		Principal Amount			Maturity Date(2)
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
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
Total principal					7,600,000
Net unamortized discount					(18,722		)
Deferred financing costs, net					(36,581		)
Total					$	7,544,697

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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 November 28, 2018, Boston Properties Limited Partnership completed a public offering of $1.0 billion in aggregate principal amount of its 4.500% unsecured senior notes due 2028. The notes were priced at 99.641% of the principal amount to yield an effective rate (including financing fees) of approximately 4.628% per annum to maturity. The notes will mature on December 1, 2028, unless earlier redeemed. The aggregate net proceeds from the offering were approximately $988.1 million after deducting underwriting discounts and transaction expenses.

On December 13, 2018, Boston Properties Limited Partnership completed the redemption of $700.0 million in aggregate principal amount of its 5.875% senior notes due October 15, 2019. The redemption price was approximately $722.6 million. The redemption price included approximately $6.6 million of accrued and unpaid interest to, but not including, the redemption date. Excluding the accrued and unpaid interest, the redemption price was approximately 102.28% of the principal amount being redeemed. The Company recognized a loss from early extinguishment of debt totaling approximately $16.5 million, which amount included the payment of the redemption premium totaling approximately $16.0 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 December 31, 2018, Boston Properties Limited Partnership was in compliance with each of these financial restrictions and requirements.