Freestanding signs and mounted wall signs for institutional uses. For each parcel with a permitted institutional use, there may be one permanent freestanding identification sign that does not exceed 24 square feet in size (sign area) and not exceeding eight feet in height; if the parcel fronts along Route 57 or Route 22, the freestanding identification sign may be 12 feet in height. For each parcel with a permitted institutional use, there may be one permanent wall identification sign that does not exceed 24 square feet in size (sign area).