I don't know how this purchase fits into your overall investments.
Is this 2-5% of your investments? In that case, if one company goes bankrupt you have a limited risk of loss. Sometimes people need to play with a small part of their portfolio.
Or is this about 20% of your investments? Then you should aim for something like VNQ, which holds ~200 different real estate companies. If any one of them experiences a problem, it's not that significant to your holdings. It's diverse within real estate, but lacks any investment in 97% of the U.S. stock market. (real estate stocks are only ~3% of the U.S. market)
And if you're pondering what to do with 100% of your investments, none of the above are diverse enough. You'd want to start with a passive total stock market index fund. I'll use Vanguard again because they have low costs: Vanguard Total Stock Market holds ~3800 stocks in it, and charges 0.04% / year in fees. If you invest $10,000 they use $4/year to keep it running. And that fund is passive, so it tends to beat all the active managers (overall they cancel each other out - some do better, some worse - but all of them spend too much money in their efforts). For example, if you look at SPIVA data, the S&P 500 beats ~80-90% of active funds.
So my advice depends on what percent of your portfolio is involved... if it's 2%, sure you could buy EQIX (the larger REIT)... if it's 20%, I personally don't emphasize real estate, but you could buy VNQ (Vanguard REIT). And if this is 100% of your investment, buy a total stock market fund like VTI (Vanguard Total Stock Market ETF).
