Parking minimums and street width minimums are a huge issue. They are an active barrier to building an old fashioned, walkable, mixed use downtown and actively

Parking minimums and street width minimums are a huge issue. They are an active barrier to building an old fashioned, walkable, mixed use downtown and actively undermine the health of such places that still do exist in some areas. There's lots of literature on that fact. Set backs and other zoning changes also mean you often cannot build townhomes right up to the lot line, even if older townhomes right up against the lot line dominate the street in question. They are grandfathered in and don't have to be torn down, but you can't build more like it. This typically makes such homes highly prized and expensive and out of the reach of most people.