One Canada Square is a skyscraper in Canary Wharf, London. It is the third tallest building in the United Kingdom at 770 feet above ground level, and contains 50 storeys. It achieved the title of the tallest building in the UK upon completion in 1991 and held the title for 21 years until the completion of The Shard in 2012. One Canada Square was designed by César Pelli with Adamson Associates and Frederick Gibberd Coombes. The building is clad with stainless steel.