Rezoning triplex into a quad in Parma Ohio.

Any experience with rezoning in Parma, OH?

I own a triplex (lot is zoned as a multi unit) that has a 4th basement unit already built by the previous owner (they occupy). It currently lacks egress but I would be happy to install if it would make sense to convert.

Has anyone been through the rezoning process in this area? I will talk to my lawyer to discuss, but I was curious if anyone has dealt with this issue before.