Within any Class HB 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-1 Districts under the same regulations and restrictions that are applicable to it in Class A and A-1 Districts;
   (b)   Multiple-family units or apartments;
   (c)   Accessory uses customarily incident to the foregoing permitted uses.
(Ord. 1962-2. Passed 1-8-62.)