The best way to implement that is with a local income tax credit, at least for cities with an income tax. That is, double the property tax but offer half of it

The best way to implement that is with a local income tax credit, at least for cities with an income tax. That is, double the property tax but offer half of it as a rebate to, and only to, people paying the local income tax (i.e. residents)—-including owner-residents and renters on a pro rata basis.