Existing buildings shall have at least one habitable room within each live/work quarter with natural light by a window or skylight with a minimum area equal to one-tenth of the floor area of the room in which it is located or ten (10) square feet which ever is greater. The windows in the habitable rooms shall face upon courts, yards, or onto similar unobstructed open area which is at least seven feet in every horizontal dimension for the floor at which the unit in question is located and at all levels of the building above. All habitable rooms in newly constructed buildings shall comply with the provisions of UBC, Section 1205 for light and ventilation. (Prior code § 9.29.1316)