During the construction period of a development, a temporary sign which identifies the architects, engineers, contractors, and other individuals or firms involved with the construction and announces the character of the building, enterprise or the purpose for which the building is intended, but not including any advertisement of any product; providing, however, that there is only one (1) sign erected for each street frontage. The area of the sign for any one (1) firm shall not exceed nine (9) square feet in area or five (5) feet in height in residential districts, and fifteen (15) square feet in area or ten (10) feet in height in commercial and industrial districts. The sign shall be confined to the site of the construction and shall be removed within fourteen (14) days of the issuance of an occupancy permit for the structure with which the sign is associated.