(1) Residential sidewalks shall be five feet in width, inclusive of the curb.
(2) Commercial sidewalks shall be seven feet in width, inclusive of the curb. Where a commercial sidewalk is offset from the curb by a landscaped planting strip of three feet or more, a commercial sidewalk may be five feet in width. The Public Works Director or designee is authorized to permit the construction of commercial sidewalks at variance with the seven-foot standard, but in no case less than five feet, under the following circumstances:
(a) Where existing conditions may make it impracticable;
(b) Where there is insufficient right-of-way;
(c) Where surrounding land uses may require an altered standard.