A structure that houses a conforming use, but that does not conform with height, setback, lot coverage, or structural requirements, may be altered or extended, if the alteration or extension does not deviate further from the standards of this title. If a structure that does not meet minimum setback requirements is altered or extended under this provision, special construction standards may be required for fire safety, pursuant to the building code. [Ord. 817 § 8-3M.230, 2006.]