Some institutions hold income producing properties directly as part of an investment portfolio. These properties are subject to interest rate risk. The two widely used measures of interest rate risk are modified duration and convexity. These measures can be difficult to calculate directly for income properties when net operating income and cash flows are not constant or when they are functions of the underlying yield. A numerical technique using sensitivity analysis is developed to provide estimates of modified duration and convexity. These estimates can then be used, along with corresponding values for debt, to determine the modified duration and convexity of the equity of the property. This can be extended to a portfolio of properties. The measurement of the interest rate risk of the equity of a portfolio of properties, using conventional interest rate risk measures, has a number of useful applications.



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