Ask investors what they want in their portfolios these days and a growing number of them will say the same thing: sustainability. A 2017 report by EY, formerly Ernst & Young, determined that sustainable investing strategies have grown 107.4 percent annually since 2012, currently representing 18 percent of assets under management in the U.S. The sustainability model is increasingly being applied to real estate, led by a solid crop of sustainable real estate investment trusts. Consider these real estate investment trusts if you’re interested in expanding your real estate holdings while taking a socially responsible stance.