Detroit would be a good city to experiment with urban restoration. Make it a Federal tax-exempt enterprise zone for 10 to 20 years. Also make it exempt from many federal regulations.
The problem with the above is the utterly corrupt Detroit city council. The above would only work if the city is manged by a bankruptcy board of trustees.
Also, for all non-criminal residents, give them firearms and train them in their use and permit concealed carry.
only after the city council is gutted