A.
Continuation. Any lawful building or structure and any lawful use of a building or land existing or authorized by a building permit which is valid at the effective date of this Part 3, or any amendment thereto, may be continued although such use does not conform to the provisions of this Part 3, or any amendment thereto.
B.
Extension. A nonconforming use of a building or land may be extended only as a variance by the Board of Adjustment. It is the policy of the City that any such extension or enlargement shall be immediately adjacent to the existing nonconforming use and shall conform to the area and height regulations of the district in which it is situated.
C.
Changes. A nonconforming use of a building or land may be changed to a nonconforming use of the same or more restricted classification. Whenever a nonconforming use of a building or land has been changed to a use of a more restricted classification or to a conforming use, such use shall not thereafter be changed to a use of a less restricted classification.
D.
Restoration. A nonconforming building, wholly or partially destroyed by fire, explosion, food or other phenomenon or legally condemned, may be reconstructed, repaired and used for the same nonconforming use, provided that building reconstruction shall be commenced within one year from the date the building was destroyed or condemned and shall be carried on without interruption.