CO_Canton of Solothurn Administrative Building

The building’s placement enhances the legibility of the open space. This creates a clear sequence of spaces that engage with, connect to, and can flexibly respond to future developments. The guiding principle behind the open-space design is the integration of the perimeter into its immediate surroundings.

Via the new west-east axis, the new Rötihof extension - and thus the entire complex - is connected both to the neighborhood and, via the existing green belt, to the Old Town. Along this axis, the Rötihof extension is open to the public during the day. The Stadthaus expansion creates a new arrival point at the Baselktor intersection for the entire St. Joseph neighborhood. An attractive plaza featuring existing trees and a fountain connects the pedestrian pathways to the bus and streetcar stops. From here, the entrances to all city and cantonal administrative buildings, as well as the St. Joseph neighborhood, are within easy reach.

A balanced ratio of green and hard surfaces, as well as the use of species-rich vegetation, has a significant impact on the existing microclimate.

An attractive buffer zone is created along the street, designed to accommodate high foot traffic. Additional trees are planted in mineral inlays and provide welcome shade. Together with a drinking fountain and seating areas, they subtly enhance the pedestrian zone.

The rooftop terraces are enlivened by a variety of recreational spaces. An interplay between intensive and extensive vegetation areas creates ecologically valuable habitats for flora and fauna. Attractive gathering spaces, as well as niches and quiet retreats, reflect the building’s intended use.

The selection of trees, shrubs, and perennials suited to the site creates a cohesive atmosphere throughout the entire grounds. Selective splashes of color, in interplay with evergreen conifers and deciduous trees, produce a magnificent interplay of colors and enhance the experience of the changing seasons. Rainwater is collected in specific areas of the green spaces, creating valuable water cycles. As a result, the site serves as an important stepping stone in the large-scale connectivity of habitats.