Subject to the provisions of this chapter, a nonconforming use or structure may be continued and maintained in reasonable repair but shall not be altered or extended, except that:
A.
The extension of a nonconforming use to a portion of a structure that was provided for the nonconforming use prior to the effective date of this ordinance shall be permitted.
B.
A structure conforming as to use but nonconforming with respect to height, setback or coverage may be altered or extended if the alteration or extension does not further deviate from the standards of this title.
(Ord. 747 § 1 (part), 1997)