On the Hauptstrasse in Berlin Schöneberg GRAFT revitalized the historical post office premises, expanding it with two new buildings and converting the original rooftops for commercial purposes. In accordance with the existing building structure, the previously unused rooftops were renovated by GRAFT according to the historical model and in compliance with the regulations for the protection of historical monuments. The roofs were fitted with additional DER windows, while the striking roof gables were kept to provide the interior with a homey atmosphere. All commercial units are barrier-free. The interventions in the structure of the historically protected rooftops serve to preserve the building, and its ongoing utilization contributes to the identity of the Berlin district.