I am a community planner working in PA. One of the communities I work with is interested in a complete overhaul of its existing zoning ordinance. It is an older industrial community that is mostly developed. Like many older communities it has developed in somewhat of a mixed-use fashion although currently has more of a traditional ordinance. Our goals are to maintain the historic character while allowing for more varied uses, specifically with respect to infill development. The community is also willing to be somewhat innovative in its efforts. I have been tossing around the idea of performance zoning, at various levels. Has any one had any experience with these types of issues in older communities and can point me in the direction of some successful communities?