The downtown area is highly congested, polluted, and expensive, and urbanization is sprawling at a rapid pace within a radius of . The largest urbanized area now lies on the southern bank of the Niger River. A modern central business district is rapidly developing immediately west of the downtown area in the ACI-2000 district, taking advantage of a well-designed geometric layout, legacy of the old airport runways and taxiways. A large administrative area is being developed at the junction between ACI-2000 and the King Fadh Bridge, containing most of the state departments (ministries) and administrative services in a central location. Bamako is also the headquarters of many large companies and administrative institutions. Air Mali (formerly Compagnie Aérienne du Mali) has its head office in Bamako. Bamako received much investment by Saudi Arabia for decades which saw a number of important structures being built. In recent years, China has become an important investor in Bamako, developing its infrastructure and facilities.