Where side yards of a lot are narrower than required for the district in which the building is located, and if the lot was owned separately from all other parcels of land on the effective date of this Zoning Ordinance or a relevant amendment thereto, and is still so owned, the building may be maintained, repaired, modernized or altered but may not be enlarged in ground floor area unless the enlarged part complies with the regulations of this Zoning Ordinance.
(Ord. 1961-103. Passed 12-29-61)