I put quotes around them because they aren't actually planned. They're officially and canonically called "planning" codes but no real long term urban planning i

I put quotes around them because they aren't actually planned. They're officially and canonically called "planning" codes but no real long term urban planning is involved. It's more short term satisfaction planning and not the kind of actual planning that goes on in other places like say China or Tokyo. Now you know why. >Part of the problem is that presently walkable cities don't have walkable codes, so as they expand or even replace old buildings they become more car centric Unlikely a city doesn't convert a high density building into a low density building because of a remodel. People really need to leave the city in droves for this to happen. What you're referring to is NEW cities or new expansions. Somerville is like a one off. It's also not really a walkable city like Tokyo or Hong Kong is. It's more like a walkable town or village.