One "Simple Fix" for cities, albeit with limited scope: Force your Planning Commission, Zoning Board, etc. to keep track of the vacancy rates for commercial space. Then use their powers to strongly discourage the construction of yet more vacant commercial space. And/or renovation of such space to other uses.
EDIT:
- Please do not assume some trivial straw-man implementation of this idea. That includes City organization being hopelessly corrupt or incompetent.