Before erecting, remodeling, or replacing any sign that will extend over any street, avenue, sidewalk, or sidewalk area, a written permit therefor shall be obtained from the City Planner. In order to obtain such a permit, the person, firm, or corporation wishing to erect remodel or replace the sign shall file with the official a written application for a permit, which application shall provide full information as to size, weight, and character of the sign, its height above the surface of the sidewalk or sidewalk area, and the distance of its outer edge from the rear line of the curb or, if there is no curb, from an extension of the rear line of the nearest curb together with drawings or other data showing the nature and location of the building to which the sign will be attached, and the method of securing and fastening the sign. If the City Planner shall find that the sign will comply with all of the requirements of this article, he or she may issue the permit; otherwise, he or she shall deny the application. Any such permit, if issued, shall be revocable by the City Planner at any time, upon a determination by him or her that the sign does not comply with all the requirements of this article as then existing.