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Research Finds That Even After the Bubble, Real Estate Remains Part of a Strong Portfolio

Home prices have been in a funk since 2006, but a new study by University of Iowa researchers shows that real estate is still an important part of a diversified and stable long-term investment portfolio, even after the bubble burst.

Jay Sa-Aadu and Ashish Tiwari, finance professors in the Tippie College of Business, and Jim Shilling, a finance professor at DePaul University, analyzed the performance of diversified investment portfolios that included domestic and international stocks, real estate, commodities and precious metals between 1972 and December 2008. That period, they note, includes the 2006 real estate meltdown and the first year of the recession that began in 2007.

Yet, despite the poor performance of real estate recently, those portfolios that included investments in real estate investment trusts (REIT) performed better than those that did not.

"In a long-term investment strategy, our research suggests that real estate provides stability to a portfolio during bad times," said Sa-Aadu.

In their study, Sa-Aadu and Tiwari started with a portfolio that was made up of large and medium cap stocks and Treasury bonds, then added various other asset classes to see how they affected performance over time from 1972 through December 2008. They found that the addition of REITs, corporate bonds, small cap stocks, international stocks and commodities and precious metals resulted in significant diversification gains. However, the various asset classes differed in important respects in terms of the timeliness of the gains.

A key result of the research is that the benefit of real estate and commodities and precious metals is most pronounced during a poor economy. Even when real estate does poorly, they said, it does less poorly than other asset classes, providing the portfolio stability.

"We found that real estate and commodities and precious metals are the two asset classes the deliver portfolio gains when consumption growth is low or volatile, when investors really care for such benefits," said Sa-Aadu and Tiwari in their paper, "On the Portfolio Properties of Real Estate in Good Times and Bad Times." The paper is forthcoming in the journal Real Estate Economics.

They said their findings on the performance of real estate in good economic times and bad suggest that the typical institutional allocation to real estate may be underweighted.

Their research suggests that during their study period, the optimal portfolio during good economic times would hold mostly domestic stocks (34 percent), with international stocks (25 percent), government bonds (22 percent) and real estate (15 percent) also included.

In contrast, an optimal portfolio during poor economic times would be mostly government bonds (53 percent), and also include precious metals (28 percent) and real estate (19 percent).

Sa-Aadu and Tiwari note that most institutional investors hold only 4 to 7 percent of their portfolios in real estate. Since a significant investment in real estate appeared in both of their optimal portfolios, they suggest that institutional investors consider increasing their real estate allocation for more stable portfolios long-term in both good and bad times.

They also said their study pertains to a long-term investment horizon in portfolios holding REITs, which invest mostly in multi-family housing and commercial property. It does not apply to a speculative investment strategy of purchasing single-family homes and selling them quickly.

Ashish Tiwari, 319-353-2185,

Tom Snee | Newswise Science News
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