Permits. No sign, billboard or other advertising device shall be erected on the exterior of any building or any land, and no sign shall be altered or enlarged, until an application, on appropriate forms furnished by the Building Department, has been filed with the Building Commissioner and the Planning Department, or their successors, with such information, including photographs, plans and scaled drawings, as may be required; and a permit shall be issued by the Building Commissioner or designee and Planning Department, or their successors, for such erection, alteration or enlargement. The fee for such permits shall be determined from time to time by the Town Council. The provisions of this subsection shall not apply to:
(3) One (1) real estate sign, advertising the premises for sale or rent, of not over ten (10) square feet in area [five (5) square feet per side] located on the premises in question.
(4) Nonaccessory signs located within the Sanitary Facility Zoning District and Industrial Zoning District, provided they shall first have obtained a permit from the Town Council for construction of said structure.