The lawful use of land existing at the time of the adoption of this chapter, although such use does not conform to the regulations herein specified for the district in which such land is located, may be continued, provided that no such use shall be enlarged or increased, nor be extended to occupy a greater area than that occupied by such use at the time of the adoption of this title, and shall be in conformity to the regulations specified for the district in which such land is located, provided, however, that a building or structure occupied by a nonconforming use or building or structure nonconforming as to height area, or yard regulations may be added to or enlarged, remodeled or moved to a new location on the lot only upon a permit authorized by the Planning Commission, which may issue such permit provided that the Commission, after a public hearing, shall find:
(A) The proposed change does not impose any unreasonable burden upon the lands located in the vicinity of the nonconforming use or structure.
(B) Will not under the circumstances of the particular case be detrimental to the health, safety, and general welfare of people in the area or the city in general.
(C) Is logically and reasonably related to the existing use and that the size and/or intensity of the enlargement, expansion, restoration or change is not such that it would more appropriately be moved to a zone district in which it is permitted.
(`67 Code, § 10-14-1)