For facilities subject to the standards in §102-76.65(a), if the costs of alterations to provide an accessible path of travel to an altered area containing a primary function are disproportionate to the costs of the overall alterations, the path of travel must be made accessible to the extent possible without exceeding 20 percent of the costs of the alterations to the primary function area. Priority should be given to those elements that will provide the greatest access in the following order:

(a) An accessible route and an accessible entrance;

(b) At least one accessible restroom for each sex or a single unisex restroom;

(c) Accessible telephones;

(d) Accessible drinking fountains; and

(e) Accessible parking spaces.