The Willis building (originally the Willis Faber and Dumas Headquarters) in Ipswich, England, is one of the earliest buildings designed by Norman Foster after establishing Foster Associates. Constructed between 1970 and 1975 for the insurance firm now known as Willis Group Holdings, it is now seen as a landmark in the development of the 'high tech' architectural style. The building houses some 1,300 office staff in open plan offices spread over three floors.