Real Estate Signs. One non-illuminated real estate "for sale" or "for rent" sign, not exceeding an area of 18 inches by 24 inches, along with name strip sign(s) located either above or below the real estate sign, which name strip shall also not exceed an area larger than 12 inches by 24 inches, shall be allowed on the premises for the sole purpose of advertising the legally-divided parcel, tract, lot or site and improvements for sale or rental. Boxes may be fastened to the temporary sign to hold fliers describing the real estate, but such boxes may be no larger than reasonably required to hold 8.5-inch by 11-inch sheets of paper. Real estate signs shall be removed from the premises no later than five days after closing of the sale. An additional real estate sign meeting the requirements set forth above may be located in the right-of-way with the written permission of the owner of the property immediately adjacent thereto, or on other private property with the written permission from the property owner. However, this additional sign shall only be allowed in these locations where the property advertised for sale does not front on a right-of-way and is not visible from a right-of-way;