power for the building. 349 Cancelled after Imperial College purchased site. 318 Clapham Junction Towers 1 2 127 / Bishops Place Building 1 126 / London Street 125 / The 'Paddington Pole'. Name Height metres / ft Floors Year (est.) Primary Use Location Notes The Tulip 305 / Observation Tower City of London Approved 1 Undershaft 300 / Office City of London Planning application submitted in February 2016. Wardian London (East Tower) 187 / Residential Isle of Dogs Application 2013/01/17 181 Approved Nov Core rising. Elephant and Castle Town Centre Tower 1 121 / Tallest tower of Elephant and Castle Town Centre redevelopment. "Building boom: the London developments revamping the skyline". Retrieved "South Bank Tower - The Skyscraper Center". Retrieved 1 maint: Archived copy as title ( link ) "Archived copy".