Real estate, work-in-progress, and garage sale signs. One sign shall be permitted without a permit so long as same does not exceed four square feet pertaining to the lease or sale of, or work-in-progress on, or a garage sale at, the lot or building, which sign shall be placed no nearer to the street than three feet from the sidewalk or, if there is no sidewalk, no nearer to the street than three feet from the front line of the property. Any such sign shall be removed after the approval of a CCO for the purchase of the premises, or completion of the work-in-progress, or completion of the garage sale. A garage sale sign may be displayed for no more than three days per property lot every six months and one work-in-progress sign per property lot for no more than 30 days every year.