The following regulations shall also apply in R-3 districts:

    A.    At least one side yard shall have a width not less than fifteen (15) feet in the case of a four-family dwelling and no multiple dwelling shall be so oriented upon a lot as to have its main or living room entrance opening into a side yard less than twenty (20) feet wide;

    B.    No dwelling shall be located in the rear of another dwelling on the same building site unless one side yard is at least fifteen (15) feet wide, except in the case of a dwelling group arranged around three sides, or on two opposite sides of an open unoccupied space other than a side yard, having a width not less than twenty-five (25) feet and extending to the front lot line;

    C.    No dwelling shall be located less than twenty (20) feet from any other dwelling on the lot, and none of such minimum required space shall be used as parking space;

    D.    The minimum width of access driveway shall be as required by Section 17.52.790;

    E.    The minimum setback from access driveway shall be as required by Section 17.52.800. (See also Section 17.52.470) (Prior gen. code § 8-29.8)