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One of the principal market risks facing us is interest rate risk on our variable rate indebtedness.
−Removed: As of December 31, 2019 , we had no variable rate debt as the LIBOR rate on our unsecured term loan facility of $265.0 million was fixed at 2.1485% under a variable to fixed interest rate swap agreement.
+Added: As of December 31, 2020, our floating rate debt of $125.0 million represented 2.6% of our total enterprise value.
Subject to maintaining ESRT's qualification as a REIT for U.S.
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We do not enter into derivative or interest rate transactions for speculative purposes.
−Removed: As of December 31, 2019 , we had interest rate LIBOR swap agreements with an aggregate notional value of $390.0 million, which fix LIBOR interest rates between 2.1485% and 2.9580% and mature between August 24, 2022 and July 1, 2026.
−Removed: All interest rate swaps have been designated as cash flow hedges and are deemed highly effective with a fair value of ($13.3 million) which is included in accounts payable and accrued expenses on the consolidated balance sheet as of December 31, 2019 .
+Added: As of December 31, 2020, we have an interest rate LIBOR swap agreement with an aggregate notional value of $265.0 million, which fixes the LIBOR interest rate at 2.1485% and matures on August 24, 2022.
+Added: This interest rate swap has been designated as a cash flow hedge and is deemed highly effective with a fair value of ($8.8) million which is included in accounts payable and accrued expenses on the consolidated balance sheet as of December 31, 2020.
+Added: Based on our variable balances, interest expense would have increased by approximately $1.3 million for the year ended December 31, 2020, if short-term interest rates had been 1% higher.
As of December 31, 2020, the weighted average interest rate on the $2.0 billion of fixed-rate indebtedness outstanding was 3.91% per annum, each with maturities at various dates through March 17, 2035.
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However, due to the uncertainty of the specific actions that would be taken and their possible effects, these analyses assume no changes in our financial structure.
−Removed: In the event that LIBOR is discontinued, the interest rates for our unsecured revolving credit facility and our unsecured term loan facility and the swap rate for our interest rate swaps following such event will be based on an alternative variable rate as specified in the applicable documentation governing such debt or swaps or as otherwise agreed upon with our bankers.
−Removed: Such an event would not affect our ability to borrow or maintain already outstanding borrowings or our ability to maintain our outstanding swaps, but the alternative variable rate could be higher and more volatile
−Removed: than LIBOR prior to its discontinuance.
−Removed: We understand that LIBOR is expected to remain available through the end of 2021 but may be discontinued or otherwise become unavailable thereafter.
+Added: In July 2017, the Financial Conduct Authority (“FCA”) that regulates LIBOR announced it intends to stop compelling banks to submit rates for the calculation of LIBOR after 2021.
+Added: As a result, the Federal Reserve Board and the Federal Reserve Bank of New York organized the Alternative Reference Rates Committee ("ARRC"), which identified the Secured Overnight Financing Rate ("SOFR") as its preferred alternative rate for USD LIBOR in derivatives and other financial contracts.
+Added: Subsequently, in November 2020, the Intercontinental Exchange (“ICE”) Benchmark Administration Limited (“IBA”), the administrator of LIBOR, announced that it would consult on its intention to cease the publication of the one-week and two-month USD LIBOR settings immediately following December 31, 2021, and the remaining USD LIBOR settings immediately following the LIBOR publication on June 30, 2023.
+Added: We are not able to predict when LIBOR will cease to be available or when there will be sufficient liquidity in the SOFR markets.
+Added: Any changes adopted by the FCA or other governing bodies in the method used for determining LIBOR may result in a sudden or prolonged increase or decrease in reported LIBOR.
+Added: If that were to occur, our interest payments could change.
+Added: In addition, uncertainty about the extent and manner of future changes may result in interest rates and/or payments that are higher or lower than if LIBOR were to remain available in its current form.
+Added: We have contracts that are indexed to LIBOR and are monitoring and evaluating the related risks, which include interest on loans and amounts received and paid on derivative instruments.
+Added: These risks arise in connection with transitioning contracts to an alternative rate, including any resulting value transfer that may occur, and are likely to vary by contract.
+Added: The value of loans or derivative instruments tied to LIBOR, as well as interest rates on our unsecured revolving credit facility and our unsecured term loan facilities and the swap rate for our interest rate swap, may also be impacted if LIBOR is limited or discontinued.
+Added: For some instruments the method of transitioning to an alternative reference rate may be challenging, especially if we cannot agree with the respective counterparty about how to make the transition.
+Added: While we expect LIBOR to be available in substantially its current form until at least the end of 2021, it is possible that LIBOR will become unavailable prior to that point.
+Added: This could result, for example, if sufficient banks decline to make submissions to the LIBOR administrator.
+Added: In that case, the risks associated with the transition to an alternative reference rate will be accelerated and magnified.
+Added: Alternative rates and other market changes related to the replacement of LIBOR, including the introduction of financial products and changes in market practices, may lead to risk modeling and valuation challenges, such as adjusting interest rate accrual calculations and building a term structure for an alternative rate.
+Added: The introduction of an alternative rate also may create additional basis risk and increased volatility as alternative rates are phased in and utilized in parallel with LIBOR.
+Added: Adjustments to systems and mathematical models to properly process and account for alternative rates will be required, which may strain the model risk management and information technology functions and result in substantial incremental costs for the company.
Our exposures to market risk have not changed materially since December 31, 2020.
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Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.