The professional fire brigade in Aachen will get a new building at the crossing Robert-Schumann-Straße / Siegelallee with the new Fire Department South. The plot is the transition point of a forest tothe city. The goal of the design is to create a compact functional body in order to enable fast functional processes and to preserve the tree population. Two massive blocks, reduced in their basic form, build a bold sculpture that creates a dialogue between city and forest. The appearance is formed by a tower and a horizontal structure, which seems to be floating on a vehicle hall of glass. The hall of glass expands the clearing with views of the city as well as interesting insights into the activities of the firefighters. The brick wall, which completely covers the two massive cuboids, hides the private functions of the fire department from the public glade. The compact floor area is achieved by a layering of functions.