The purpose of this chapter is to regulate the use, maintenance, alteration, repair, extension and restoration of buildings and land which lawfully existed at the time of adoption of the ordinance codified in this chapter, but which do not conform to the regulations for the district in which they are located. (Ord. No. 360, §§ 1, 3, 4-6-93; Ord. No. 2009-08, §§ 1, 2, 6-2-09. 1976 Code § 15-1-43(A))