It would depend on whether the ordinance's terms--what it means; what it prohibits; the substance of it--was changed last year, or if the "rewriting" was more cosmetic, to clear up some inconsistencies or outdated references. If the same things are restricted new as were restricted pre-June 2011, those restrictions will still stand and are grandfathered in; if the restrictions or substance of the ordinance is new, than it is not grandfathered in.