Within the Districts and Overlays established by this Zoning Regulation there exist lots, structures, and uses of land and structures which were lawful before this Zoning Regulation was passed but, which would be prohibited, regulated, or restricted under the terms of this Zoning Regulation or subsequent amendments thereto. These non-conformities may continue as they exist at the time of this Regulation's adoption, but shall not be permitted to expand or be altered except in conformance to this Zoning Regulation. Such uses are declared by this Zoning Regulation to be incompatible with permitted uses in the districts or overlays involved. It is the intent of this Regulation that such non-conformities shall be allowed to continue, but not be enlarged upon, expanded and extended, nor be used as grounds for adding other structures or uses prohibited elsewhere in the same district, unless otherwise approved by the Board of Zoning Appeals according to Section 1137.03.