Transformation of high-rise building "Zur Schanze" Zurich, 2014

The high architectural quality of the building constructed by Werner Stücheli and René Herter in 1960 and its relevancy regarding urban development were important factors when it came to the decision to preserve its architectural appearance. An interpretive reconstruction of the original front took place in 2000. Its elements were skilfully adjusted and optimised in order to ensure the energetic optimisation required and maintaining the building in the long run while at the same time keeping its appearance.
The stunning view of the city and its architectural potential as well as the intended use as a restaurant were decisive for the concept of adding a storey. It was realised in 2002 as a transparent cube on the floor plan geometry of the existing attic rooftop. The restaurant and its roof terraces were distributed on two levels. The two-storey, connecting wing was replaced in 2014 due to utilisation reserves and a structural need for renewal. The location and its relevancy regarding urban development as well as the roof edge’s geometry were preserved, the skyscraper freed from the connecting structure on the first floor. The ground floor with stores and restaurants remains public. A new courtyard creates a connection to the upper floor.