Some readers expressed a concern that redevelopment of that long-blighted area would lead to “gentrification,” or an influx of middle-class or affluent people. Now, I would share that concern if the area formerly known as the Superblock were inhabited. But since it’s vacant — a common condition throughout a city that once had 300,000 more residents than it does today — I don’t think gentrification is a thing there. I want to ask the people who are worried about an invasion of the middle-class horde: What do you want? Baltimore has plenty of Maryland’s poor, and the poor need affordable housing, and developers should be required to include it when they build. But don’t tell me we should at the same time be fending off the more affluent.