In a residential zone district one nonilluminated sign advertising the prospective sale or rental of the premises on which it is located, not exceeding four square feet in area, either attached to the wall of the building or a ground sign set back a minimum of 10 feet from the street, provided that it shall be maintained and removed within seven days after the completion of a sale or lease of the premises.

In any nonresidential zone district a maximum of two nonilluminated signs advertising the prospective sale or rental of the premises on which they are located, not exceeding 10 square feet in area, six feet in height, either attached to the wall of the building or a ground sign, set back a minimum of 10 feet from the street, provided that they shall be maintained and removed within seven days after the completion of a sale or lease of the premises.

A maximum of two nonilluminated signs on sites where construction is in progress pursuant to a Planning Board approved site plan or major subdivision, not exceeding 25 square feet in area, and provided that they shall be maintained and removed within seven days after completion of the construction work.

Signs for public and charitable purposes not exceeding 25 square feet in area, provided the same do not otherwise violate the provisions of this chapter for a period not exceeding one month.

Signs for political purposes provided the same are removed within seven days after the election date applicable to such sign.

A temporary sign pending approval of a permanent sign shall be granted at the discretion of the Board. Permission to use a temporary sign in no way implies approval, and the temporary sign may be required to be removed if the permanent sign is not approved.