 Designed by the Richard Rogers Partnership with structural engineering by Ove Arup & Partners, its 15,000 square metres architecture follows on from – but is more restrained than – the Lloyd's building in the City of London, and was constructed between 1990 and 1994.Twin four-storey office blocks arranged in an L shape are connected by a curved front with a dramatic concave glazed wall.Despite nearly all Channel 4 programmes being commissioned from independent production companies, the Channel 4 headquarters originally contained a studio and post-production facility, marketed as 124 Facilities.