Editor’s note: This story has been updated with information about the proportion of Puerto Rico’s territory that is covered by the opportunity zone program.

When Daniel Zelonker, a South Florida broker who specializes in the sale of industrial buildings, looks for properties to recommend to clients, he confronts a challenge familiar to commercial real estate practitioners. While his clients often have a long time horizon for their investments, they want a solid return down the road in exchange for their patience—but the bite of taxes can stand in the way of achieving that goal.

“They have income they don’t need today, and they want to see their funds grow,” says Zelonker, the owner of Z Miami Commercial Real Estate LLC. “I have to give them something [attractive] to do with their money.”