Having said that, there are still some great options out there which may be able to help you keep everything in one place (listing the property to 10+ major rental listing sites, managing listing responses + scheduling viewing times, tenant screening w/ a fully comprehensive application, digital lease creation, online rent collection, and maintenance request tracking).

Expensive, but comprehensive.  

This usually occurs when a political argument can be made that a given solution will enhance the neighborhood but doesn't comply with the zone.