Within the districts established by this chapter or amendments, there exists lots, buildings, uses of land and characteristics of use which were lawful before this chapter or amendments were passed, but which would be prohibited, regulated or restricted under terms of this chapter or future amendments. Regulations for the continuance, maintenance, repair, restoration and discontinuance of nonconforming lots, buildings, land and uses are established for the following purposes:
A. To permit these nonconformities to continue, but to minimize any adverse effect on adjoining properties and development.
B. To regulate their maintenance and repair.
C. To restrict their rebuilding if substantially destroyed.
D. To require their permanent discontinuance if not operate for certain periods.
E. To require conformity if they are discontinued and to bring about the eventual compliance with the objectives of the Future Land Use Plan and this chapter.