During the summer of 2015, planning permission was submitted for the tallest building in the City of London, designed to reach a mammoth 309.6m in height. 1 Undershaft will have 73 storeys, with a square footprint, a free viewing gallery for the public at the top and a 150m x 10m public space under the tower. The core of the tower will be to the west in a bid to improve the public experience on the ground. This will create an impressive, red cross-gartered, slender shaft.