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
London Guarantee Building Beaux Arts tower. From the 1960s through the 1980s, the studios of Chicago's WLS (AM) radio were located on the fifth floor of the building. For several decades, Paul Harvey performed his daily syndicated radio show from studios on the fourth floor. The building was also famous from the 1950s through the early 1970s for The London House, a famous Chicago jazz nightclub and steakhouse that was located on the west side of the building's first floor; it had its own entrance on Wacker Drive. It was one of the foremost jazz clubs in the country, once home to such