“…Beside investments in raw materials like oil, precious and industrial metals, real estate investments show low correlation with stocks and bonds and therefore, have appropriate characteristics contributing to portfolio optimization. A summary of former research on the benefits from investing in real estate is presented by Sirmans and Worzala (2003) and Worzala and Sirmans (2003). Further analyses were conducted by Steinert and Crowe (2001), Conover et al (2002), Bond et al (2003), Brounen and Eichholtz (2003), Lee (2005), Lee and Stevenson (2005), Waggle and Agrrawal (2006), Cheng and Roulac (2007), Idzorek et al (2007), Jin et al (2007), Fugazza et al (2008), Yat-Hung et al (2008), and Sebastian and Sturm (2009).…”