Kigali Rwanda's highest buildings, including the 20-storey Kigali City Tower, are located in the CBD, as are the headquarters of the country's largest banks and businesses. Other buildings in the CBD include the upmarket Serena, Marriott and Mille Collines hotels, the University Teaching Hospital of Kigali, the national university's College of Science and Technology, and government buildings such as the National Bank of Rwanda and the Ministry of Finance and Economic Planning. To the south west of the CBD, and also on the Nyarugenge Hill, is the suburb of Nyamirambo. This was the second part of the city to be settled,
Kigali it remained a relatively small city until the 1970s due to government policies restricting rural-to-urban migration. The population reached 115,000 by 1978, and 235,000 by 1991. The city lost a large fraction of its population during the 1994 genocide, including those killed and those who fled to neighbouring countries. From 1995, however, the economy began to recover and large numbers of long-term Tutsi refugees returned from Uganda. Many of these refugees settled in Kigali and other urban areas, due to difficulty in obtaining land in other parts of the country. This phenomenon, coupled with a high birth rate and increased