Nonconforming structures.
A structure that was lawful when constructed, but which no longer conforms to the requirements of this article for development regulations shall be considered nonconforming. Repairs and alterations may be made to an undamaged nonconforming structure, provided that no structural alterations shall be made except those required by law or ordinance to preserve the building in a structurally sound condition, unless the structure is brought into conformity with the provisions of this article. A nonconforming structure shall not be enlarged, changed, expanded, extended, or the footprint of the building changed except to be brought into compliance with the currently adopted ordinance.