The district requirements with respect to yards and other open spaces shall not apply in cases where the conversion is a part of a dwelling group meeting the requirements specified in Chapter 1187. Such yard and other open-space requirements shall also not apply in cases where the conversion will not involve any major exterior structural changes and:
(a) There is a shortage in the required dimensional area of each of not more than two said requirements as to yards and other open spaces; or
(b) In case the conversion will result in a lot area per dwelling unit or family at least twenty percent (20%) greater than required for new buildings in the district.
(Ord. 12-1966. Passed 10-10-66.)