One Canada Square of London."" One Canada Square was originally designed to be high at 55 storeys, but that penetrated the permitted projection height of the flight obstruction area of the airport approach district to London City Airport, but this was extended to a height of above kerb level in consideration of the fact that One Canada Square was on the external zone of the airport approach. To comply with air traffic safety regulations, the architects took five floors off the tower. The final height of was permitted, otherwise, the developers would have had to dismantle what was necessary to fit the height
Citigroup Centre, London to the owners. The east facing side of 25 Canada Square up to level 40 is configured for use by tenants. 33 Canada Square, or Citigroup Centre 1, is the smaller of the two buildings in the complex, designed by Norman Foster and completed in 1999, two years before its neighbour. At tall, the building is made up of eighteen floors, all of which are adjoined to their equivalent floors in 25 Canada Square. The building is owned by Citigroup, and was built before the completion of the Jubilee line extension in late 1999. In addition to main entrances from