The ‘Solitär’ is also characterised by an innovative architectural concrete façade that has been realised with Hering Architectural Concrete. betoShell® NEO30 elements in sizes of up to 3.60 x 2.40 metres were used by the slapa oberholz pszczulny (sop) firm of architects, which is based in Düsseldorf. These façade elements possess two carbon-reinforced layers that allow a single element thickness of only three centimetres to be realised. With its white acidified finish, the corner of the building creates a sophisticated highlight for this modern area of the City.