Louisville, Ky., is dotted with vacant lots and buildings that are ripe for redevelopment. The city, in fact, owns hundreds of such properties. But potential buyers can’t even start bidding on those sites if they lack basic information about what’s available. “Most cities don’t know what they own,” says Cristina Garmendia, cofounder of Opportunity Space, a Bostonbased start-up that has developed an online platform that makes data about surplus government property more open and more...

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