No building or structure shall be constructed or enlarged unless the following yards are provided and maintained in connection with such building.

    A.    Front Yard. No front yard shall be required when all frontage between two intersecting streets lies within this district. However, when lots within this district are adjacent to and adjoining lots in an R district, all of which front upon the same street between the two intersecting streets, there shall be established the same front yard setback for all of the frontage as has been established in the abutting R district.

    B.    Side Yard. No side yard shall be required, except for a corner lot which abuts upon an R district, or upon an alley separating this district from an R district. There shall then be provided a side yard equal to one-half of the front yard required in the abutting R district, but in no case, more than ten feet. The same setback shall apply also if business buildings front the intersecting street, commonly referred to as the side street.

    C.    Rear Yard. There shall be a rear yard of not less than twenty (20) feet; provided, however, that a one-story accessory building may be located thereon, except for the five feet adjacent and parallel to the rear lot line or alley line, for the parking of motor vehicles and the unloading and loading of vehicles under roof. (Ord. 741 § 1 (part), 1989: prior code § 40-7-2(D))