Debt

Debt consisted of the following as of March 31, 2019 and December 31, 2018 (amounts in thousands):



	Principal Balance						As of March 31, 2019
	March 31, 2019			December 31, 2018			Stated Rate		Effective Rate⁽¹⁾		Maturity Date⁽²⁾
Mortgage debt collateralized by:
Fixed rate mortgage debt
Metro Center	$	91,298		$	91,838		3.59	%	3.68	%	11/5/2024
10 Union Square	50,000			50,000			3.70	%	3.97	%	4/1/2026
1542 Third Avenue	30,000			30,000			4.29	%	4.53	%	5/1/2027
First Stamford Place⁽³⁾	180,000			180,000			4.28	%	4.39	%	7/1/2027
1010 Third Avenue and 77 West 55th Street	38,812			38,995			4.01	%	4.22	%	1/5/2028
10 Bank Street	33,568			33,779			4.23	%	4.36	%	6/1/2032
383 Main Avenue	30,000			30,000			4.44	%	4.55	%	6/30/2032
1333 Broadway	160,000			160,000			4.21	%	4.29	%	2/5/2033
Total mortgage debt	613,678			614,612
Senior unsecured notes - exchangeable	250,000			250,000			2.63	%	3.93	%	8/15/2019
Senior unsecured notes:⁽⁶⁾
Series A	100,000			100,000			3.93	%	3.96	%	3/27/2025
Series B	125,000			125,000			4.09	%	4.12	%	3/27/2027
Series C	125,000			125,000			4.18	%	4.21	%	3/27/2030
Series D	115,000			115,000			4.08	%	4.11	%	1/22/2028
Series E	160,000			160,000			4.26	%	4.27	%	3/22/2030
Series F	175,000			175,000			4.44	%	4.45	%	3/22/2033
Unsecured revolving credit facility⁽⁶⁾	—			—			⁽⁴⁾		⁽⁴⁾		8/29/2021
Unsecured term loan facility⁽⁶⁾	265,000			265,000			⁽⁵⁾		⁽⁵⁾		8/29/2022
Total principal	1,928,678			1,929,612
Unamortized discount, net of unamortized premium	(980		)	(1,647		)
Deferred financing costs, net	(8,526		)	(9,032		)
Total	$	1,919,172		$	1,918,933

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(1)	The effective rate is the yield as of March 31, 2019, including the effects of debt issuance costs and the amortization of the fair value of debt adjustment.


(2)	Pre-payment is generally allowed for each loan upon payment of a customary pre-payment penalty.


(3)	Represents a $164 million mortgage loan bearing interest at 4.09% and a $16 million loan bearing interest at 6.25%.


(4)	At March 31, 2019, the unsecured revolving credit facility bears a floating rate at 30 day LIBOR plus 1.10%. The rate at March 31, 2019 was 3.59%.


(5)	The unsecured term loan facility bears a floating rate at 30 day LIBOR plus 1.20%. Pursuant to an interest rate swap agreement, the LIBOR rate is fixed at 2.1485% through maturity. The rate at March 31, 2019 was 3.35%.


(6)	At March 31, 2019, we were in compliance with all debt covenants.

Principal Payments

Aggregate required principal payments at March 31, 2019 are as follows (amounts in thousands):



Year	Amortization		Maturities		Total
2019	$	2,856	$	250,000	$	252,856
2020	3,938		—		3,938
2021	4,090		—		4,090
2022	5,628		265,000		270,628
2023	7,876		—		7,876
Thereafter	33,868		1,355,422		1,389,290
Total	$	58,256	$	1,870,422	$	1,928,678

Deferred Financing Costs

Deferred financing costs, net, consisted of the following at March 31, 2019 and December 31, 2018 (amounts in thousands):



	March 31, 2019			December 31, 2018
Financing costs	$	25,315		$	25,315
Less: accumulated amortization	(11,047		)	(10,027		)
Total deferred financing costs, net	$	14,268		$	15,288

At March 31, 2019 and December 31, 2018, $5.7 million and $6.3 million, respectively, of net deferred financing costs associated with the unsecured revolving credit facility was included in deferred costs, net on the condensed consolidated balance sheet.

Amortization expense related to deferred financing costs was $1.0 million and $1.0 million for the three months ended March 31, 2019 and 2018, respectively.

Unsecured Revolving Credit and Term Loan Facility

During August 2017, through the Operating Partnership, we entered into an amended and restated senior unsecured revolving credit and term loan facility (the “Facility”) with Bank of America, N.A., as administrative agent, Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC as Joint Lead Arrangers and Joint Bookrunners, Wells Fargo, National Association and Capital One, National Association, as co-syndication agents, and the lenders party thereto.

The Facility is in the original principal amount of up to $1.365 billion, which consists of a $1.1 billion revolving credit facility and a $265 million term loan facility. We may request the Facility be increased through one or more increases in the revolving credit facility or one or more increases in the term loan facility or the addition of new pari passu term loan tranches, for a maximum aggregate principal amount not to exceed $1.75 billion.

The initial maturity of the unsecured revolving credit facility is August 2021. We have the option to extend the initial term for up to two additional 6-month periods, subject to certain conditions, including the payment of an extension fee equal to 0.0625% and 0.075% of the then outstanding commitments under the unsecured revolving credit facility on the first and the second extensions, respectively. The term loan facility matures on August 2022. We may prepay the loans under the Facility at any time, subject to reimbursement of the lenders’ breakage and redeployment costs in the case of prepayment of Eurodollar Rate borrowings.

Exchangeable Senior Notes

Issued in August 2014, the $250.0 million 2.625% Exchangeable Senior Notes (“2.625% Exchangeable Senior Notes”) are due August 15, 2019. The 2.625% Exchangeable Senior Notes will be exchangeable into cash, shares of Class A common stock or a combination of cash and shares of Class A common stock, at our election. We have asserted that it is our intent and ability to settle the principal amount of the 2.625% Exchangeable Senior Notes in cash. As of March 31, 2019, the exchange rate of the 2.625% Exchangeable Senior Notes was 52.0764 shares per $1,000 principal amount of notes (equivalent to an initial exchange price of approximately $19.20 per share of Class A common stock), subject to adjustment, as described in the related indenture governing the 2.625% Exchangeable Senior Notes.

For the three months ended March 31, 2019, total interest expense related to the 2.625% Exchangeable Senior Notes was $2.4 million, consisting of (i) the contractual interest expense of $1.6 million, (ii) the additional non-cash interest expense of $0.7 million relating to the accretion of the debt discount and (iii) the amortization of deferred financing costs of $0.1 million. For the three months ended March 31, 2018, total interest expense related to the 2.625% Exchangeable Senior Notes was $2.4 million, consisting of (i) the contractual interest expense of $1.6 million, (ii) the additional non-cash interest expense of $0.7 million relating to the accretion of the debt discount, and (iii) the amortization of deferred financing costs of $0.1 million.