One Canada Square the recycling of waste heat to cool and warm the building. Aggregates used in the office build were from predominantly recycled sources, part of a strategy to integrate sustainable products and materials throughout the site, delivering both affordable and sustainable environmentally friendly features to the building. One Canada Square energy performance has improved by decreasing 30% from 2007 to 2016 by initiatives such as installing LEDs and upgrading HVAC and water services. The ground floor, foyer area and basement levels of One Canada Square are open to the general public, having an underground retail area and a transport interchange from
Citigroup Centre, London both Canada Square and Upper Bank Street, Citigroup Centre is also accessible via underground walkways from Canada Place shopping mall and Canary Wharf London Underground station - served by the Jubilee line. The Centre is also close to DLR stations Canary Wharf and Heron Quays, which provide connections with the City, London City Airport and surrounding areas. Citigroup Centre, London The Citigroup Centre is a building complex in London. It houses Citigroup's EMEA headquarters and is located in Canary Wharf in the city's Docklands. The centre provides of floor space across two merged buildings - 33 Canada Square (known as