4. A business may affix to any existing lawful sign or on the exterior wall of its
4. A business may affix to any existing lawful sign or on the exterior wall of its building a sign advertising available employee positions. The particular employee positions available may be altered without specific authorization for each alteration. Such sign shall not exceed fifty (50) square feet. No such sign shall be erected until a permit has been obtained from the Building Commissioner pursuant to Section 6.3.8. Said permit shall expire on the ninety-first day following the date it was issued, provided, however one extension may be granted, in the discretion of the Building Commissioner, for good cause, for not more than an additional ninety (90) days.