Uses in any C-3 District outside of an Historic District shall be permitted one major sign, either freestanding, attached, or projecting. If freestanding, the sign shall be set back from all street and property lines a distance equivalent to one linear foot for each two square feet of sign area, shall not exceed 20 square feet in area and a maximum height of five feet. If projecting, the sign shall not extend more than five feet from the building and shall not exceed 12 square feet in area, 15 feet to its highest point and no closer than eight feet at its lowest point to the walkway or finished surface below. Attached signs shall not exceed 12 square feet in area, 15 feet in height and a minimum of eight feet at its lowest point. Where a principal use occupying at least 750 square feet of segregated area has direct access from the outside, a sign not exceeding four square feet in area, identifying the name of the activity, may also be attached to the building at the entrance or suspended from a pent roof or a porch ceiling.