When it comes to development and the balance between commercial, industrial, and residential projects, zoning laws may be everything. So when it comes to assessing the candidates for Mayor, zoning policy matters. Vicki Been, director of the Furman Center for Real Estate and Urban Policy at NYU explains zoning basics. Then, Julia Vitullo-Martin, director of the Center for Urban Innovation at the Regional Plan Association, and Adam Friedman, director of the Pratt Center for Community Development, discuss re-zonings and how they've affected development in the city.