One Canada Square 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
above ground level and containing 50 storeys. In late 2010, it was surpassed in construction height by the Shard London Bridge, which is currently under construction and will become the tallest completed building in the United Kingdom in mid 2012. One Canada Square was designed by principal architect Cesar Pelli, 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 building is recognised as a London landmark and it has gained much attention through film, television and other media because of its status as one of the tallest buildings in the United Kingdom.