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The office complex is situated on a historical ­urban axis, not far from Königsplatz. Two ­existing buildings laid out at right angles to each other have been complemented by a new tract set on the diagonal. As a result of this layout, two new open spaces have been created: a garden, and a 950-square-metre courtyard covered by a transparent membrane roof. Along the side of the existing building, the roof is supported by 19-metre-high columns. The other edge is borne by the new development. The roof structure consists of steel valley girders with inflated cushions spanned between them. The cushions, 3.70 metres wide and up to 30 metres in length, consist of 0.2 mm fire-resistant ethylene sheeting ­welded together and filled with air from compressors. The smooth surfaces of the membrane are regarded as self-cleaning. The cushions can support foot traffic for maintenance purposes and have a light-transmission rate of 94 per cent. The hall is ventilated via glass louvred windows. Additional ventilation is provided by 8-metre-high stelae in which lighting is also integrated.