Each tool or structure in use needs repair and care. For instance, the car you drive also needs some care, or when you are the owner of a house and you rent it, you should repair it every two or three years; sometimes the main parts of the house needs repair and sometimes you should only take care of the appearance.
Since Tehran Beautification Organization has achieved permission for renting advertisement billboards in the city, it is responsible to repair and color them once in a while. Therefore, this organization aims to recruit companies to repair these structures through a tender. The companies should repair and color the billboards with high quality materials and erase visual pollution.