One Canada Square of the building, designed by Cesar Pelli and Koetter Kim. The extension replaced the stainless steel columns, car parking spaces and road leading to Canada Square. The extension was made to create more retail space at street level, where five tenants were chosen to occupy the space: four restaurants and Lloyds Bank. The extension's roof terrace is open to diners and contains a green roof having sedum moss. The name given to the building by the developers is 'One Canada Square', but it is often incorrectly called 'Canary Wharf Tower' or simply 'Canary Wharf'. The Civil Aviation Authority shows the
Centre Square (building) works of contemporary art. Until the company left in the mid-1980s, Arco Chemical Co., whose headquarters was in Centre Square, had a large collection of contemporary art displayed throughout the complex. Philadelphia has a percent for art program, which requires that a percentage of construction costs be allocated for art. A fan and collector of contemporary art, developer Jack Wolgin had three pieces commissioned to fulfill the ordinance. The most famous piece is Claes Oldenburg's Cor-Ten and stainless steel sculpture, "Clothespin". Located atop the subway entrance in the plaza in front of the building, Centre Square is best known because