Combining singles into a duplex.

[Jesse Schafer]

If this is elsewhere on the site I apologize, I wasn't sure how to even search for it. If not than awesome. Lol I recently picked up half of a duplex being sold as a single family residence, I'm considering buying the other half, I'm curious if it's possible and how I would go about having it "rezoned" as a duplex instead of 2 single family residences. Also if it would be possible to remortgage as duplex if I owned both but was unable rezone.