It shall be unlawful for any person to erect any sign which will project or extend over any street, alley, sidewalk or other public property, or which will be supported by a pole, pipe, or other support located or set on any street, alley, sidewalk, or other public property, without first obtaining a permit to do so from the City Secretary. Application for such permit shall be filed with the City Secretary and shall set forth the proposed location of such sign, the material out of which same is to be constructed, its dimensions, the exact location of the pole, pipe, or other support, if located on city property, and the height of such sign, measured from the bottom of the sign to the ground. No such permit shall be issued unless the application is approved by the Mayor.