Where side yards are narrower than required for the district in which the building and lot are located and which was owned separately from all other tracts of land on the effective date of this Zoning Ordinance or any amendment thereto, and is still so owned, the building may be maintained or altered but may not be enlarged in width unless the total width of the side yards complies with the regulations of this Zoning Ordinance. (Ord. 1166. Passed 9-24-01.)