Item 3. Quantitative and Qualitative Disclosures About Market Risk
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
Our future income, cash flows and fair values relevant to financial instruments are dependent upon prevalent market interest rates. We are exposed to interest rate changes primarily on our unsecured revolving credit facility and debt refinancings. In order to mitigate our interest rate risk, we may borrow at fixed rates or may enter into derivative financial instruments such as interest rate swaps or caps on floating rate financial instruments. We are not subject to foreign currency risk and we do not enter into derivative or interest rate transactions for speculative purposes.
As of March 31, 2023, we have interest rate LIBOR swap and cap agreements and SOFR swap agreements with an aggregate notional value of $574.4 million and which mature between October 1, 2024 and November 1, 2033. The "variable to fixed" interest rate swaps have been designated as cash flow hedges and are deemed highly effective with fair values in an asset and liability position of $12.5 million and $(2.2) million, respectively, and are included in prepaid expenses and other assets and in accounts payable and accrued expenses, respectively, on the condensed consolidated balance sheet as of March 31, 2023. Given the phasing out of LIBOR, we have entered into SOFR swap agreements to begin the replacement of our LIBOR swap agreements. We will continue to work with our lenders and counterparties to replace or modify, as appropriate, the interest rate provisions in our other LIBOR swap and cap agreements.
As of March 31, 2023, the weighted average interest rate on the $2.3 billion of fixed-rate indebtedness outstanding was 3.9% per annum, with maturities at various dates through March 17, 2035.
As of March 31, 2023, the fair value of our outstanding debt was approximately $2.1 billion, which was approximately $180.9 million less than the book value as of such date. Interest risk amounts were determined by considering the impact of hypothetical interest rates on our financial instruments. These analyses do not consider the effect of any change in overall economic activity that could occur in that environment. Further, in the event of a change of that magnitude, we may take actions to further mitigate our exposure to the change. 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.
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