Canary Wharf Main Tower
It is a skyscraper in Canary Wharf in the London Borough of Tower Hamlets. It is the tallest completed building in the United Kingdom since 1991, standing at 235 metres (770 ft) above ground level and containing 50 storeys. One Canada Square was designed by principal architect Cesar Pelli in 1986, who based the design and shape mainly on the World Financial Center and Big Ben. One of the predominant features of the building is the pyramid roof which contains a flashing aircraft warning light, a rare feature for buildings in the United Kingdom. The distinctive pyramid pinnacle is at 240 metres (800 ft) above sea level. Cesar Pelli chose the marble Fior di Pesco Carnico
, one of his favourite marble, for the flooring and facings.