The purpose of the R-3 zone is to provide appropriate locations where apartment house neighborhoods of varying degrees of density may be established, maintained, and protected. The regulations of this district are designed to promote and encourage an intensively developed residential environment, with appropriate environmental amenities such as open areas, landscaping and off-street parking. To this end, the regulations permit, in accordance with the respective density districts, multiple dwellings ranging from garden apartments to multi-story apartment houses, and necessary public services and activities subject to proper controls. Also permitted, subject to special control, are certain retail and service activities intended for the convenience and service of the residents of the district. (Ord. 3153 § 2 (Exh. A), 2010; Ord. 1212 § 1, 1969; prior code § 33.505(A)).