The Plenary Hall in Bonn was completed in 1992 and used by the German Bundestag until 1999.
The 2-storey basement was designed in jointless reinforced concrete structure. The 80 cm strong bottom-plate does ensure watertightness and safety against uplift. The first floors are made of steel structure with welded, concrete-poured columns, girders and composite steel decks. For the roof structure a steel grid system, composed out of welded girders was used. The building complex is stiffened by crosswise fixed stainless steel cables.