With an area of 3.99 square kilometres (sq.km), Central Business District (CBD) Chaoyang is home to around 3,000 domestic and foreign companies. Like other world-famous districts such as Manhattan in New York City and Zhonghuan in Hong Kong, CBD provides an excellent investment environment, convenient transportation, and a high-speed telecommunications system. Office towers, hotels, first-class apartments and multiple service organizations involved in finance, IT and intermediary service industries make Chaoyang Beijing's biggest and most rapidly developing economic area. CBD has become a symbol of modern Beijing.