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Indebtedness (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Schedule of additional outstanding debt | At December 31, 2021 and 2020, our outstanding indebtedness consisted of the following:
|  |  |  | Principal Balance as of December 31,
Floating Rate Debt (1) |  | Maturity |  | 2021 |  | 2020
Revolving credit facility (2) |  | January 2023 |  | $ | 800,000 |  |  | $ | — |
Term loan |  | September 2022 |  | — |  |  | 200,000 |
Total floating rate debt |  |  |  | $ | 800,000 |  |  | $ | 200,000 |
(1)As of December 31, 2021 and 2020, the unamortized net debt issuance costs on certain of these debts were $0 and $951, respectively. (2)Outstanding borrowings under our revolving credit facility. In February 2022, we exercised our option to extend the maturity date of our revolving credit facility by one year to January 2024.
|  |  |  |  |  | December 31, 2021 |  | December 31, 2020
Senior Unsecured Notes (1) |  | Coupon |  | Maturity |  | Face Amount |  | Unamortized Discount |  | Face Amount |  | Unamortized Discount
Senior unsecured notes |  | 6.750 | % |  | December 2021 |  | $ | — |  |  | $ | — |  |  | $ | 300,000 |  |  | $ | 490 |
Senior unsecured notes |  | 4.750 | % |  | May 2024 |  | 250,000 |  |  | 184 |  |  | 250,000 |  |  | 263 |
Senior unsecured notes |  | 9.750 | % |  | June 2025 |  | 1,000,000 |  |  | — |  |  | 1,000,000 |  |  | — |
Senior unsecured notes |  | 4.750 | % |  | February 2028 |  | 500,000 |  |  | 5,169 |  |  | 500,000 |  |  | 6,013 |
Senior unsecured notes |  | 4.375 | % |  | March 2031 |  | 500,000 |  |  | — |  |  | — |  |  | — |
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 |  |  |  |  |  | $ | 2,850,000 |  |  | $ | 5,353 |  |  | $ | 2,650,000 |  |  | $ | 6,766 |
(1)As of December 31, 2021 and 2020, the unamortized net debt issuance costs on certain of these notes were $37,836 and $35,045, respectively.
Schedule of secured and other debt |
|  | Principal Balance as of December 31, |  |  |  |  |  | Number of Properties as Collateral |  | Net Book Value of Collateral as of December 31,
Secured and Other Debt |  | 2021 (1) |  | 2020 (1) |  | Interest Rate |  | Maturity |  | At December 31, 2021 |  | 2021 |  | 2020
Mortgage note |  | $ | 11,120 |  |  | $ | 11,838 |  |  | 6.28 | % |  | July 2022 |  | 1 |  |  | $ | 23,525 |  |  | $ | 23,500 |
Mortgage note |  | 10,479 |  |  | 10,724 |  |  | 4.85 | % |  | October 2022 |  | 1 |  |  | 19,211 |  |  | 19,675 |
Mortgage note |  | 15,456 |  |  | 15,805 |  |  | 5.75 | % |  | October 2022 |  | 2 |  |  | 19,099 |  |  | 19,180 |
Mortgage note |  | 15,204 |  |  | 15,646 |  |  | 6.64 | % |  | June 2023 |  | 1 |  |  | 24,593 |  |  | 23,023 |
Mortgage notes (2) |  | — |  |  | 620,000 |  |  | 3.53 | % |  | August 2026 |  | — |  |  | — |  |  | 705,096 |
Mortgage note |  | 10,240 |  |  | 10,470 |  |  | 4.44 | % |  | July 2043 |  | 1 |  |  | 13,387 |  |  | 13,582 |
Finance Leases |  | 6,636 |  |  | 7,811 |  |  | 7.70 | % |  | April 2026 |  | 2 |  |  | 18,527 |  |  | 18,097 |
Total secured |  | $ | 69,135 |  |  | $ | 692,294 |  |  |  |  |  |  | 8 |  |  | $ | 118,342 |  |  | $ | 822,153 |
(1)The principal balances are the amounts stated in the contracts. In accordance with GAAP, our carrying values and recorded interest expense may be different because of market conditions at the time we assumed certain of these debts. As of December 31, 2021 and 2020, the unamortized net premiums and debt issuance costs on certain of these mortgages were $(578) and $721, respectively. (2)The property encumbered by these mortgages is located in Boston, Massachusetts and was contributed in the first quarter of 2017 to a joint venture, which we deconsolidated in December 2021 and in which we currently own a 20% equity interest. As of December 31, 2020, this property was consolidated into our financial statements. See Note 3 for further information regarding this joint venture.
Schedule of required principal payments on outstanding debt | Required principal payments on our outstanding debt as of December 31, 2021, are as follows:
Year |  | Principal Payment |
2022 |  | $ | 39,067 |  |
2023 |  | 816,413 |  |
2024 |  | 251,834 |  |
2025 |  | 1,002,001 |  |
2026 |  | 904 |  |
Thereafter |  | 1,608,916 |  | (1)
(1) The carrying value of our total debt outstanding as of December 31, 2021, including unamortized debt issuance costs, premiums and discounts was $3,676,524.

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