We study the diversification benefits of REIT preferred and common stock using a utility‐based framework in which investors segment based on risk aversion. We examine optimal mean‐variance portfolios of investors with different levels of risk aversion given access to different classes of assets and establish three main results. First, REIT common stock helps low risk aversion investors attain portfolios with higher returns, while REIT preferred stock helps high risk aversion investors by providing a venue for risk reduction. Second, REIT preferred stock has a risk‐return profile not easily replicated by other asset classes. Finally, conclusions drawn from the empirical analysis are markedly different under these constraints compared to the classical unconstrained setting.