Most people don't see that as viable because American cities don't have the public transit needed to make that viable, and equally important, don't have condos built that are the size of a family home. And there's a big push among suburban parents to judge their kids for living in cities, even if they're not as dangerous as the parents think.

If we modeled Spain, we could have more condos. That would require good, safe transit, condos with green space and multiple rooms at a SFH price point, and a cultural change among the older generation to view cities as having less crime.