Neukölln (German pronunciation: [nɔʏˈkœln]) is one of the twelve boroughs of Berlin. It is located in the southeastern part from the city centre towards Berlin Schönefeld Airport. It was part of the former American sector under the Four-Power occupation of the city. It features many Gründerzeit buildings and is characterized by having one of the highest percentage of immigrants in Berlin. In recent years an influx of students and creative types has led to gentrification.