1 Undershaft is a skyscraper planned for the City of London financial district. The scheme is being developed by Aroland Holdings and designed by Eric Parry Architects. It is set to replace the St Helen's tower, and if built will be the second-tallest building in London and the United Kingdom at 294 metres. Its height above sea level will match that of the Shard at just shy of 310 metres, making them appear the same height on the skyline.