The Zoning Officer shall issue a zoning certificate, upon request
of the property owner, recognizing the status of a nonconforming use
as a legal nonconforming use. It shall be the burden of the property
owner to provide sufficient proof that the use was legally operated
or constructed prior to adoption of current ordinance provisions rendering
said use, structure, or lot nonconforming and that, in the case of
uses, such have not been abandoned.