First wish on my list would be to bring back enough employment opportunities to bring the city back financially and, bring more people/small businesses into the city.
My second wish would be to completely rid the city of its current city council staff and, have Detroit go about a different approach of how city council people are elected. (the city should be broke down into districts where each city council person lives in each district so each area of the city has fair representation).
Third, enforce strict zoning laws in the city so ...