You don't have to nuke anything. Every street is fixed/rebuild from time to time (30-40 years). The steps to follow are: 1) Allow mixed use zones. 2) Update t

You don't have to nuke anything. Every street is fixed/rebuild from time to time (30-40 years). The steps to follow are: 1) Allow mixed use zones. 2) Update the specs how the roads/streets are supposed to look like. After that, grab a pint and watch how your neighborhood transforms.