In 1970, the Brixton School of Building (founded in 1904), the City of Westminster College (founded in 1918 – and not the same institution as the current City of Westminster College) and the National College of Heating, Ventilating, Refrigeration and Fan Engineering (founded in 1947) merged with the Polytechnic to become the Polytechnic of the South Bank. The new institution adopted a coat of arms designed to include two Thames barges set above a pentagon surrounded by five other pentagons. An official designation service took place the following year, at which Margaret Thatcher was the guest speaker. In 1972 the purpose-built Wandsworth Road site opened, providing space for the Polytechnic's Faculty of the Built Environment, which at the time was the biggest and most comprehensive faculty in Europe for teaching built environment subjects such as surveying, town planning, architecture and other property related professional disciplines. In 1975, the extensive London Road building was opened, providing space for expanding business courses and the library. In 1976, part of Rachel MacMillan College of Education merged with the Polytechnic along with the Battersea College of Education bringing with them sites at Manresa House, Roehampton and Manor House, Clapham Common.