A. 
Within the districts established by this chapter or amendments thereto, there exist lots, structures and uses of land which were lawful before this chapter was passed or amended, but which will not comply with one or more of the provisions of this chapter. Such land, buildings and structures, and the uses thereof, which do not conform to the zoning regulations prescribed for the district in which they are situated, are referred to in this article as "nonconforming." The purpose of this article is to regulate nonconforming uses, structures, and lots in a manner consistent with sound planning and zoning principles and in accordance with applicable laws.
B. 
The general intent is that, over time, nonconforming uses, structures, and lots should not be expanded or enlarged except in conformance with this chapter. However, it is also recognized that nonconforming uses, structures, and lots need not be entirely static, and that under certain circumstances, nonconforming uses, buildings, structures, and lots may change, in accordance with the provisions of this chapter.