The yard requirements in C-N districts shall be as follows, subject to the general provisions of Section 17.52.330:

    A.    Depth of front yard: not less than twenty (20) feet;

    B.    Depth of rear yard: none, except that where the abutting lot at the rear is in an R district there shall be rear yard having a depth not less than fifteen (15) feet;

    C.    Width of side yard: none, except that where the abutting lot at the side is in any R district, there shall be side yard having a width not less than the minimum required in such R district and the side yard on the street side of a corner lot shall be not less than ten feet. (Prior gen. code § 8-47.3)