(a) The lowest story, or the ground story, or first story of any building is the lowest story, the floor of which is not more than three and one-half feet below the average contact ground level at the exterior walls of the building; except that any basement used for residence purposes, other than for a janitor or caretaker or his family, shall be deemed a ground or first story.
(b) A mezzanine story shall be deemed a full-story in case it covers more than one-third of the area of the ground story.
(Ord. 11-71. Passed 5-25-71.)