With Haus 24, the architects von Gerkan, Marg and Partners (gmp) expand the existing ensemble on the site of Norddeutscher Rundfunk (NDR) in Lokstedt. The new U-shaped building is the first module of a larger extension project and, with its position at the main gate, creates a new entrance situation to the NDR site. The extension features flexibly adjustable office and production areas with much daylight, sustainable low-tech service installations, and a high proportion of recyclable construction materials.