Driving down Lake Street on the city's west side Monday, I stopped to take a look at the former Dett Elementary School. Dett was one of the 49 schools closed by Mayor Rahm Emanuel in 2013 for "underutilization" after its population dropped precipitously. Instead of being re-purposed, now, eight years later, the building still sits boarded-up and graffitied, a costly, dangerous blight on the neighborhood.