In a central location on Düsseldorf’s upmarket shopping boulevard Königsallee, David Chipperfield Architects Berlin is transforming the former headquarters of the HSBC Bank into a contemporary office building. The 19th-century avenue is framed by a perimeter block development comprising diverse architecture of different scales and eras, including the 1970s bank building originally designed by Düsseldorf architects HPP. The project aims to sensitively integrate the converted building into its urban context while at the same time creating a new distinctive identity. With a clear focus on sustainable project development, the existing building is used as a valuable resource and a strategy of adaptive re-use is systematically pursued.
The robust reinforced concrete shell of the first four storeys will be retained and extended by three new set-back storeys, correlating in height with the immediate urban context. The new programmatic concept of the client and project developer, the Hamburg-based Momeni Group, envisages upscale offices on the upper floors with public uses, such as restaurant and retail facilities, at ground floor level. A primary premise for the design and organisation concept is maximising daylight. A new central atrium enhances the attractiveness of the adjoining office areas, while floor-to-ceiling glazing on all floors optimises the relationship to outdoor areas.
The original principle of the curtain wall is maintained and forms the conceptual starting point for the new building envelope: a sculptural façade made of high-quality, light-coloured pre-cast concrete. The slightly increasing façade depths and the tapered pilaster strips give the building an overall light and elegant appearance.
The preservation of over 70% of the building shell significantly reduces upfront embodied carbon emissions. In collaboration with Concular, valuable resources from the existing building were repurposed, following a circular construction strategy. All granite slabs from the existing façade will be re-used as aggregate in the prefabricated concrete elements of the future building envelope. With the aim of optimising sustainable operations, the building mass will be energetically activated. Blue roofs harvest water in the event of heavy rainfall and provide space for photovoltaic panels. Leafy terraces at different levels extend the workplaces, creating biodiverse areas within the urban fabric and providing an organic contrast to the geometric rhythm of the architecture.