Alteration or completion of any nonconforming use or related structure may be permitted as follows:
A. When necessary to reasonably continue the use.
B. When necessary to comply with any lawful requirement for alteration in the use.
C. When alteration or extension of a nonconforming use does not cause the structure to deviate further from the standards of this title.
D. When a structure is determined to be suitable for only nonconforming uses, and proposed new uses are determined to be no more detrimental to surrounding properties than the use to be replaced. (Ord. 86, 12-7-1993)