The 22-storey Grosspeter Tower stands at the south-east entrance to Basel, with access to the A2/A3 motorway in the immediate vicinity and the Basel SBB railway station nearby. Beside the streets and tracks, this high-rise projects upwards to a height of 78 m and provides 18,000 m² of floor space for a hotel and offices.

Its shape comes from the concept of two interlocking volumes. The ground floor accommodates spacious lobby and reception areas for the offices in the tower and for the hotel in the base section, which were built according to a core-and-shell principle.

Underneath, in the four underground levels below the tower and the hotel, there is a multi-storey car park with a total of 153 parking spaces, as well as the hotel’s delivery zone. Some of the parking spaces are rented out to the tenants of the office space in the tower, while others are public and accessible to the hotel guests.

To enable the interior space to be used as efficiently and unrestrictedly as possible, the support structure is integrated into the facade layer. As a steel Vierendeel truss in the form of a building-sized square tube, it braces the whole building, carries the accumulated loads and also enables extensive projections on the lower floors.