It shall be unlawful for any person to paste, post, paint, print or nail any handbill, sign, poster, advertisement or notice of any kind on any public property, curbstone, flagstone or any other portion or part of any sidewalk, or upon any tree, lamppost, hitchpost, telegraph pole, hydrant or upon any private wall, door or gate, without the consent in writing of the owner of the wall, door or gate; provided, however, that this Section shall not prevent posting by proper Village and County officials of election signs, polling place signs and other signs or placards necessary under the law to the conduct of elections.