Within any Class B District no building, structure or premises shall be used or arranged or designed to be used, except for one or more of the following uses:
   (a)   Any principal use or accessory use permitted in Class A and A-l Districts under the same regulations and restrictions that are applicable to it in Class A and A-l Districts;
   (b)   Multiple-family units or apartments^
   (c)   Accessory uses customarily incident to the foregoing permitted use.
(Ord. 1953-29. Passed 6-1-53.)