Temporary signs shall be erected in accordance with the use, area, height and placement regulations of Section 1143.11 (Schedule of Regulations for Temporary Signs). Permits for such signs shall specify the maximum continuous length of time such sign may be used and such sign shall thereafter be removed by the permitted sign owner unless such time is extended by the Director of Public Safety upon finding that such sign is not detrimental to the surrounding area. Fees for temporary signs shall be required as directed by ordinance of City Council.