Every dwelling unit shall have not less than one means of exit, with at least one doorway having a minimum head room of six feet eight inches, leading to safe and open space at ground level. Every dwelling unit in a multiple dwelling of three stories or more shall have immediate access from its doorway to two or more approved passageways with minimum head room of seven feet, six inches and a minimum width of three feet, leading to safe and open space at ground level. (Ord. 1977-14 § 11-11, 1977)