In business and industrial districts, temporary signs shall not exceed 32 square feet in area per face. Permits therefor shall be issued by the Code Enforcement Officer upon payment of a fee as provided for in the fee schedule in Part Two - Title Twelve, Chapter 298 of these Codified Ordinances. Such temporary signs are limited to one sign for a period not to exceed 90 days in any calendar year. Temporary signs shall be placed no closer than five feet from the lot line or the public right-of-way and shall not obstruct the view of any public street, alley or private driveway.