A fence or wall may be erected, placed or maintained along a lot line on residentially zoned property to a height not exceeding eight feet above ground, except that no such fence or wall exceeding 2 1/2 feet in height except as specified under § 365-3D shall be permitted in a required front or corner side yard. The design and material of all fences or walls shall be subject to the approval of the Zoning Administrator, who, upon granting such approval, shall issue a permit therefor.