Willis Tower vs The Shard

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The Willis Tower (formerly and informally: Sears Tower, its title until 2009) is a 110-story, 1,450-foot (442.1 m) skyscraper in Chicago. At completion in 1973, it surpassed the World Trade Center in New York City to become the tallest building in the world, a title that it held for nearly 25 years; it was also the tallest building in the Western Hemisphere for 41 years, before the new One World Trade Center surpassed it in 2013. While it held the title of'Tallest Office Building' before 2013, it dropped the title of'Tallest Man-Made Construction' after only 3 decades. The CN Tower in Toronto, which functions as a communications tower, took over the title in 1976. The Willis Tower is considered a seminal accomplishment for engineer Fazlur Rahman Khan. It is currently the third-tallest construction in the USA and the Western hemisphere -- and the 23rd-tallest in the world.

Annually, several million people visit its observation deck, the highest in the USA, which makes it one of Chicago's most popular tourist destinations. The arrangement was renamed in 2009 by the Willis Group as a term of its lease. As of April 2018, the building's largest tenant is United Airlines, which moved its corporate headquarters in 77 West Wacker Drive (then the United Building) in 2012, occupying around 20 flooring. Other major tenants include the building's namesake Willis Towers Watson and law firms Schiff Hardin and Seyfarth Shaw. Morgan Stanley plans to move into the construction in 2019 and become its fourth-largest tenant by 2020.

Source: Wikipedia

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The Shard, also referred to as the Shard of Glass, Shard London Bridge and Previously London Bridge Tower, is a 95-storey skyscraper, designed by the Italian architect Renzo Piano, in Southwark, London, that forms a Part of the Shard Quarter development.

Standing 309.6 metres (1,016 feet) high, the Shard is the tallest building in the United Kingdom, and the sixth-tallest construction in Europe. It is also the second-tallest free-standing structure in the United Kingdom, after the concrete tower of the Emley Moor transmitting station. It replaced Southwark Towers, a 24-storey office block constructed on the website in 1975. The Shard's construction began in March 2009; it was topped out on 30 March 2012 and inaugurated on 5 July 2012. Practical completion was achieved in November 2012. The tower's privately operated observation deck, The View from The Shard, was opened to the general public on 1 February 2013. The glass-clad pyramidal tower includes 72 habitable floors, with a viewing gallery and open observation deck on the 72nd floor, at a height of 244 metres (801 ft). The Shard was developed by Sellar Property Group on behalf of LBQ Ltd and is collectively owned by Sellar Property (5%) and the State of Qatar (95%). The Shard is managed by Real Estate Management (UK) Limited on behalf of the owners.

Source: Wikipedia