Blank walls shall not be permitted along any exterior wall facing a street, parking area, or sidewalk, and all walls visible from a street, parking area, or sidewalk shall be designed to create the appearance of an occupied building, including a minimum of 30% window/door area, except that:
(1)
Ground floor front facades of buildings facing a street shall be transparent (i.e., consisting of clear glass windows and doors) between the height of three feet and eight feet above the walkway grade for at least 50% of the horizontal length of the structure. Notwithstanding the foregoing, medical offices and medical clinics may use windows with frosted glazing or other transparency alternatives for no more than 25% of the horizontal length of said building, if necessary to protect patient privacy.