"Person with disabilities" means a natural person, who, as determined by a licensed physician: (1) cannot walk two hundred feet without stopping to rest; (2) cannot walk without the use of, or assistance from, a brace, cane, crutch, another person, prosthetic device, wheelchair, or other assistive device; (3) is restricted by lung disease to such an extent that his or her forced (respiratory) expiratory volume for one second, when measured by spirometry, is less than one liter, or the arterial oxygen tension is less than 60 mm/hg on room air at rest; (4) uses portable oxygen; (5) has a cardiac condition to the extent that the person’s functional limitations are classified in severity as Class III or Class IV, according to standards set by the American Heart Association; or (6) is severely limited in the person’s ability to walk due to an arthritic, neurological, or orthopedic condition. (Ord. 1998-1 § 1, 1998)