Permitted uses and legal nonconforming uses, but not including home occupations, may display signs pertaining to the use of the property, having an aggregate total face area of not more than four square feet and not projecting beyond the principal building of such use to which they are attached more than 18 inches, or one sign may be erected in the ground, provided that such ground signs shall not exceed 15 square feet in total face area, shall not exceed five feet in height as measured from the ground to the top of the sign, shall be parallel to the lot frontage and shall be no closer than 10 feet to any property line. If such freestanding signs face other than parallel to the lot frontage or display in more than one direction, they shall have a face area of not more than eight square feet per side, with no more than two sides.