The Risk Adjusted Return (RAR) allows property investors to compare investment opportunities with different return and risk profiles. This investment performance measure, which is also often referred to as the Sharpe Ratio is calculated as follows:
Risk Adjusted Return = (Expected Return – Risk-Free Return)/ Risk
This formula actually calculates the expected return in excess of the risk-free rate per unit of risk. In this formula, expected return is the return expected to be achieved by the particular property investment, the risk-free return is the return achieved in the marketplace by risk-free investments and risk is the perceived risk for the particular property investment opportunity. The risk-free rate typically used for property investments is the 10-year T-bill rate.
Assessing the risk of a particular real estate investment is not easy and is usually done through Monte Carlo simulations of random future cash flows of the property based on a set of plausible ranges for the major income and expense items determining such cash flows.
The Risk Adjusted Return is often used at the asset class or property-type level, where historical return data can be used to calculate average historical returns, which are considered to represent the expected return for each property type, and their volatility (standard deviation), which is considered to measure the risk associated with such returns. In such a context, the RAR formula can be written as:
RAR = (Average Return – Risk-Free Return)/ Standard Deviation
Notice that the average return for a property type and its standard deviation may vary depending on the historical period that is used to calculate such measures. For example, using the data for office returns published on the site of the National Council of Real Estate Investment Fiduciaries (NCREIF) for the period 1990-2010 the average return is 6.4% and the standard deviation is 11.4%. However, if we use the period 2000-2010 for the calculation of the same measures, the average office return comes to 7.7% and the standard deviation to 12.2%.
Calculation of risk-adjusted returns for the four major property types for the period 2000-2010, points to retail as the property type with the highest RAR and office the property type with the lowest RAR.
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