Nairobi has grown around its central business district. It takes a rectangular shape, around the Uhuru Highway, Haille Selassie Avenue, Moi Avenue and University Way. It features many of Nairobi's important buildings, including the City Hall and Parliament Building. The city square is also located within the perimeter.
Most of the skyscrapers in this region are the headquarters of businesses and corporations, such as I&M and the Kenyatta international Conference Center. The United States Embassy bombing took place in this district, prompting a new embassy building to be built in the suburbs.
In 2011, the city was considered to be about 4 million residents. A large beautification project took place in the Central Business District, as the city prepared to host the 2006 Afri-Cities summit. Iconic buildings such as the Kenyatta International Conference Centre had their exteriors cleaned and repainted.
Nairobi downtown area or central business district is bordered to the southwest by Uhuru Park and Central Park. The Mombasa to Kampala railway runs to the southeast of the district.