No person, firm or corporation shall erect or maintain any sign, signboard, poster or rigid canopy over any street, sidewalk, alley or on other public property without having first obtain a permit therefor. Permits for signs, canopies, posters and signboards shall be issued by the City Clerk or Building Official, subject to the approval of the Building Official, upon the payment of a fee set by resolution of the City Council. All signs and canopies extending over any public sidewalk, street, alley or other public place must be securely fastened and constructed so that there will be no danger of the same being dislodged by ordinary winds or falling from other causes. No sign or canopy shall be erected or maintained which extends over any public sidewalk, street, alley or other public place in such a location as to obstruct the view of any traffic light, sign or signal. Upon the written order of the City Council, any person owning or occupying the premises where such a sign, canopy, poster or signboard is located shall cause the same to be removed within the time limit specified on such notice.