Designed by David du Aberdeen, the Grade II* listed Congress House was built in the late 1950s and is one of the most important British buildings of the decade. The main assembly hall is in the basement with a large lightwell consisting of glazed hexagons situated in the middle of the square site. On three sides of the building are offices and meeting rooms. The fourth side of the building consists of the memorial wall with its imposing relief sculpture by Sir Jacob Epstein, carved from a single ten-ton block of Roman stone. Outside the building is a bronze sculpture by Bernard Meadows representing the spirit of trade unionism with the strong helping the weak. The offices have open plan space and there are large conference rooms wooden floors; mixture of high-tech and wood-panelled rooms. Underground car park. In 2018, an extensive redevelopment of the rear of the building was carried out, creating a new entrance, reception, offices and staff facilities, and a public artwork by German artist Eva Berendes.