Willis Tower vs Torre Colpatria

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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 Torre Colpatria (English: Colpatria tower) is a 50-story skyscraper in the downtown area of Bogotá, Colombia. It's the third largest building in the nation and the fifth-tallest in South America. Constructed from 1973 to 1978 and opened in 1979, it has a complete height of 196 metres (643 ft), becoming the tallest skyscraper of Colombia and holding this title until 2016, when the south tower of the BD Bacatá was topped off. The main headquarters of the Colpatria Bank are located in the building, in addition to a large number of other banks and financial corporations have offices in it. The building lies at the intersection of 26th street and 7th avenue, in the heart of the city's downtown. Since 1998 the Colpatria Tower was illuminated nightly with thirty-six color changing Xenon lights. But, in 2012, the Dutch lighting company Philips replaced the old lights with a 120-meters-high LED system to enhance the lighting of the construction and project high-definition pictures. . Due to that, and also because it was the tallest skyscraper in Colombia for almost 40 years, the building is a landmark in the nation and dominates Bogota's skyline along with other structures like the BD Bacatá, the World Trade Center, FONADE and Colseguros buildings.

Source: Wikipedia