In the city center of Neunkirchen in Saarland the former Karstadt building needs to be reconfigured to make it an attractive center for the city again. Therefore we change the facades for diversifying the building parts, in order to break the scale down to the surrounding city structure. for establishing a new function a core will be created inside the building. The new functions foresee retail in the lower floors, office above it and student housing in the top floors. This way a new functional diversity should help to to revive the struggling city center.