

		Principal Balance as of December 31,
Unsecured Floating Rate Debt ⁽¹⁾	Maturity	2019		2018
Revolving credit facility ⁽²⁾	January 2022	$	537,500	$	139,000
Unsecured term loan ⁽³⁾	January 2020	—		350,000
Unsecured term loan	June 2020	250,000		—
Unsecured term loan	September 2022	200,000		200,000
Total unsecured floating rate debt		$	987,500	$	689,000



				December 31, 2019				December 31, 2018
Senior Unsecured Notes ⁽¹⁾	Coupon		Maturity	Face Amount		Unamortized Discount		Face Amount		Unamortized Discount
Senior unsecured notes	3.250	%	May 2019	$	—	$	—	$	400,000	$	19
Senior unsecured notes	6.750	%	April 2020	200,000		59		200,000		274
Senior unsecured notes	6.750	%	December 2021	300,000		1,024		300,000		1,558
Senior unsecured notes	4.750	%	May 2024	250,000		342		250,000		421
Senior unsecured notes	4.750	%	February 2028	500,000		6,857		500,000		7,702
Senior unsecured notes	5.625	%	August 2042	350,000		—		350,000		—
Senior unsecured notes	6.250	%	February 2046	250,000		—		250,000		—
Total senior unsecured notes				$	1,850,000	$	8,282	$	2,250,000	$	9,974



	Principal Balance as of December 31,							Number of Properties as Collateral	Net Book Value of Collateral as of December 31,
	Principal Balance as of December 31,							Number of Properties as Collateral	Net Book Value of Collateral as of December 31,
Secured and Other Debt	2019 ⁽¹⁾		2018 ⁽¹⁾		Interest Rate		Maturity	At December 31, 2019	2019		2018
Mortgage note ⁽²⁾	$	—	$	42,618	3.79	%	July 2019	—	$	—	$	61,199
Mortgage note ⁽³⁾	1,426		2,037		7.49	%	January 2022	1	11,469		14,602
Mortgage note	12,513		13,146		6.28	%	July 2022	1	23,662		24,064
Mortgage note	10,958		11,180		4.85	%	October 2022	1	20,139		20,602
Mortgage note	16,131		16,441		5.75	%	October 2022	2	19,751		20,342
Mortgage note	16,056		16,442		6.64	%	June 2023	1	22,854		20,538
Mortgage notes ⁽⁴⁾	620,000		620,000		3.53	%	August 2026	1	724,715		745,079
Mortgage note ^{(3) (5)}	1,589		1,983		6.25	%	March 2026	1	4,226		4,402
Mortgage note	10,688		10,901		4.44	%	July 2043	1	13,756		13,816
Capital Leases	8,874		9,832		7.70	%	April 2026	2	18,432		17,970
Total secured	$	698,235	$	744,580				11	$	859,004	$	942,614

We have a $1,000,000 revolving credit facility that is available for general business purposes, including acquisitions. The maturity date of our revolving credit facility is January 2022, and, subject to the payment of an extension fee and meeting other conditions, we have the option to extend the maturity date of the facility for an additional year. Our revolving credit facility provides that we can borrow, repay and re-borrow funds available under our revolving credit facility until maturity, and no principal repayment is due until maturity. Our revolving credit facility requires annual interest to be paid on borrowings at the rate of LIBOR plus a premium of 120 basis points per annum, and a facility fee of 25 basis points per annum on the total amount of lending commitments under the facility. The interest rate premium and facility fee are each subject to adjustment based upon changes to our credit ratings. The facility also includes a feature pursuant to which in certain circumstances maximum borrowings under the facility may be increased to up to $2,000,000.

As of December 31, 2019, the annual interest rate payable on borrowings under our revolving credit facility was 2.8%. The weighted average annual interest rates for borrowings under our revolving credit facility were 3.4%, 3.0% and 2.4% for the years ended December 31, 2019, 2018 and 2017, respectively. As of December 31, 2019, we had $537,500 outstanding and $462,500 available for borrowing, and as of February 28, 2020, we had $593,000 outstanding and $407,000 available for borrowing under our revolving credit facility.

We have a $250,000 term loan that matures in June 2020 and is prepayable without penalty at any time. Subject to the satisfaction of certain conditions, including the payment of an extension fee, we have the option to extend the maturity date by six months. We obtained this term loan in December 2019. This term loan requires annual interest to be paid at the rate of LIBOR plus a premium of 125 basis points that is subject to adjustment based upon changes to our credit ratings. At December 31, 2019, the annual interest rate payable on amounts outstanding under this term loan was 2.9%. The weighted average annual interest rate for amounts outstanding under this term loan was 2.9% for the year ended December 31, 2019.

We used the net proceeds from our $250,000 term loan, together with proceeds from our dispositions, borrowings under our revolving credit facility and cash on hand, to prepay in full our $350,000 senior unsecured term loan that was scheduled to mature on January 15, 2020. The interest rate on the new term loan is LIBOR plus 125 basis points. As a result of this prepayment, we recorded a loss on early extinguishment of debt of $27 for the year ended December 31, 2019.

We also have a $200,000 term loan that matures in September 2022 and is prepayable without penalty at any time. This term loan requires annual interest to be paid at the rate of LIBOR plus a premium of 135 basis points that is subject to adjustment based upon changes to our credit ratings. At December 31, 2019, the annual interest rate payable on amounts outstanding under this term loan was 3.2%. The weighted average annual interest rate for amounts outstanding under this term loan was 3.7%, 3.4% and 2.7% and for the years ended December 31, 2019, 2018 and 2017, respectively. This term loan includes an accordion feature under which maximum borrowings may be increased to up to $400,000 in certain circumstances.

Interest on our senior unsecured notes are payable either semi-annually or quarterly in arrears; however, no principal repayments are due until maturity. Required monthly payments on our mortgages include principal and interest. Payments under our capital leases are due monthly. We include amortization of capital lease assets in depreciation and amortization expense.

Our revolving credit facility and term loan agreements and our senior unsecured notes indentures and their supplements provide for acceleration of payment of all amounts due thereunder upon the occurrence and continuation of certain events of default, such as, in the case of our revolving credit facility and term loan agreements, a change of control of us, as defined, which includes RMR LLC ceasing to act as our business and property manager. Our revolving credit facility and term loan agreements and our senior unsecured notes indentures and their supplements also contain covenants, including covenants that restrict our ability to incur debts, and generally require us to maintain certain financial ratios, and our revolving credit facility and term loan agreements restrict our ability to make distributions under certain circumstances. We believe we were in compliance with the terms and conditions of the respective covenants under our revolving credit facility and term loan agreements and our senior unsecured notes indentures and their supplements at December 31, 2019.

In May 2019, we redeemed at par all of our outstanding 3.25% senior notes due 2019 for a redemption price equal to the principal amount of $400,000, plus accrued and unpaid interest of $6,500. We funded this redemption with cash on hand and borrowings under our revolving credit facility.

Also in May 2019, we prepaid, at par plus accrued interest, a mortgage note secured by four of our senior living communities with an outstanding principal balance of approximately $42,211, a maturity date in July 2019 and an annual interest rate of 3.79%. As a result of this prepayment, we recorded a loss on early extinguishment of debt of $17 for the year ended December 31, 2019. We prepaid this mortgage using cash on hand and borrowings under our revolving credit facility.

In February 2020, we prepaid, at par plus accrued interest, a mortgage note secured by one of our senior living communities with an outstanding principal balance of approximately $1,554, a maturity date in March 2026 and an annual interest rate of 6.25%. We prepaid this mortgage using cash on hand and borrowings under our revolving credit facility.

In January 2018, we prepaid, at par plus accrued interest, a mortgage note secured by one of our properties with an outstanding principal balance of approximately $4,338, a maturity date in September 2043 and an annual interest rate of 4.4%. In July 2018, we prepaid, at par plus accrued interest, mortgage notes secured by 12 of our properties with an aggregate outstanding principal balance of approximately $90,602, maturity dates in October 2018 and a weighted average annual interest rate of 5.0%. In September 2018, we prepaid, at par plus accrued interest, a mortgage note secured by one of our properties with an outstanding principal balance of approximately $6,325, a maturity date in January 2019 and an annual interest rate of 4.7%. As a result of these prepayments, we recorded a loss on early extinguishment of debt of $22 for the year ended December 31, 2018. We prepaid these mortgages using cash on hand and borrowings under our revolving credit facility.

In April 2017, we prepaid, at par plus accrued interest, a mortgage note secured by 17 of our properties with an outstanding principal balance of approximately $277,837 plus an aggregate premium of $5,449, a maturity date in September 2019 and an annual interest rate of 6.71%. In May 2017, we prepaid, at par plus accrued interest, a mortgage note secured by one of our properties with an outstanding principal balance of approximately $10,579, a maturity date in August 2017 and an annual interest rate of 6.15%. In June 2017, we prepaid, at par plus accrued interest, a mortgage note secured by one of our properties with an outstanding principal balance of approximately $8,807, a maturity date in August 2037 and an annual interest rate of 5.95%. In December 2017, we prepaid, at par plus accrued interest, a mortgage note secured by one of our properties with an outstanding principal balance of approximately $8,403, a maturity date in April 2018 and an annual interest rate of 6.73%. As a result of these prepayments, we recorded a loss on early extinguishment of debt of $7,627 for the year ended December 31, 2017. We prepaid these mortgages using cash on hand and borrowings under our revolving credit facility.