Where at the time of passage of this Zoning Code or any amendments thereto lawful use of land and/or structures exists which would not be permitted by this Zoning Code, the use may be continued so long as it remains otherwise lawful, provided:
(a) No such non-conforming use and/or structure shall be enlarged or increased nor extended to occupy a greater area of land than was occupied at the effective date of adoption or amendment of this Zoning Code unless said enlargement does not result in an increase in non-conformity or results in a change to a use permitted in the district.
(b) No such non-conforming use and/or structure shall be moved in whole or in part to any portion of the lot or parcel other than that occupied by such use and/or structure at the effective date of adoption or amendment of this Zoning Code unless said move results in decreasing the degree of non-conformity or results in conformity with the requirement for the district.
(c) No additional structure not conforming to the requirements of this Zoning Code shall be erected in connection with such non-conforming use of land. No additional uses of a nature which would be prohibited generally in the district involved shall be permitted.
(d) Any non-conforming use may be extended throughout any parts of a building which were arranged or designed for such use at the time of adoption or amendment of this Zoning Code, but no such use shall be extended to occupy any land outside such building.
(e) If no structural alterations are made, any non-conforming use of a structure, or structure and premises, may as a special exception be changed to another nonconforming use provided that the Planning Commission, either by general rule or by making findings in the specific area, shall find that the proposed use is equally appropriate or more appropriate to the district than the existing nonconforming use. In permitting such change, the Planning Commission may require appropriate conditions and safeguards in accord with the provisions of this Zoning Code.
(f) When any non-conforming use, or structure and use in combination, is superseded by a permitted use and/or structure, the use shall thereafter conform to the regulations for the district, and no non-conforming use and/or structure shall thereafter be resumed;
(g) Where non-conforming status applies to a use and/or structure, removal or destruction of the structure shall eliminate the non-conforming status of the land. Destruction for the purpose of this subsection is defined as damage to an extent of more than 50 percent of the replacement cost at a time of destruction. No non- conforming use shall be established after said destruction;
(h) If any such non-conforming use and/or structure of land ceases for any reason for a period of more than one year (except when government action impedes access to the premises) any subsequent use of such land and/or structure shall conform to the regulations specified by this Zoning Code for the district in which such land is located.
(1969 Code 150.303)