No person shall place, affix, erect, extend, project over, suspend or maintain or cause to be placed, affixed, erected, extended, suspended or maintained any unauthorized sign in, over or on public property, public utility poles, light poles, public rights-of-way, trees in the public right-of-way, or on publicly owned or maintained land unless:
1. The prior approval by the owner of the public property for placement of the sign appears on the sign or has otherwise been provided to the City of San Bernardino, in writing, proor to such placement; or
2. The public property is a traditional public forum such as the park or the sidewalk, and the sign is held or personally attended to by one or more persons.
"personally attended" means that the person is in such control of the sign as to prevent the infliction of damage upon the sign or the infliction of physical damage by the sign; or
3. Placement is otherwise permitted by the Development Code or other applicable law of the City of San Bernardino.