Addition or alteration of floor area may be made to existing Group R buildings within the sixty (60) CNEL noise contour but outside the seventy-five (75) CNEL contour without making the entire building comply with all the requirements of this chapter for new construction unless the cost of improvements is seventy-five (75) percent or more of the total assessed value of the structure, in which case the entire building shall be made to comply. No addition of habitable space shall be made to existing Group R buildings inside the seventy-five (75) CNEL contour unless the entire building is made to comply. All additions of separable habitable rooms, and all separable habitable rooms or areas that result from an expansion of the building, including both the newly expanded area and the pre-existing room or area, shall fully comply with the design and construction procedures and standards set forth in this Code.
(§ 2, Ord. 2616, eff. June 20, 1996)