The new headquarters of the Chamber of Commerce of the Grand Duchy of Luxemburg was completed in 2004. It is located on the Kirchberg plateau of Luxembourg and comprises a fully renovated existing building of 5,000 m2 and new buildings providing an additional 20,000 m2 of office space. The new buildings form a succession of four distinct wings linked together by glass footbridges. They have a steel primary frame with glass and steel façades, and the floors are designed as composite slabs using stainless steel panels profiled in a sinusoidal shape. Within the composite floor slab, water-carrying plastic pipes are placed to provide heating and cooling through the exposed stainless steel ceilings, leading to significant energy savings.