How hard is it to get a property rezoned in Philadelphia county?

[Kevin Coleman]

Hey guys, this is my first post to BP! So my fiancé are looking for a duplex now but we're finding that they are a hard find in our price range. Then ones we find are going to give us the proper ROi we'd like. My question is this...we found a great single famly that has all the workings of a duplex but is zoned single family. As a single family the REturn is minimal for cash flow but for duplex (2 single units) it would be a killer find. How hard is it to get a property rezoned in Philadelphia? Any other suggestions? Any other locations that are good for a rental? We'd live in for about 1 year before my transfer to DC for 18 months. Kevin