Willis Tower vs Torre Cepsa

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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 Cepsa (renamed in June 2014, before was Torre Bankia)(English: Cepsa Tower) is a skyscraper located in the Cuatro Torres Business Area in Madrid, Spain.

With a height of 248.3 m (815 ft) and 45 floors, it is the second tallest of the four structures at the Cuatro Torres Business Area complex, surpassed by Torre de Cristal by less than a metre. It's the second tallest building in Spain and the 4th tallest building in the European Union. Designed by Lord Foster, it was initially known as Torre Repsol and would have served as headquarters for Repsol YPF oil and gas company. During the building of the tower, Repsol decided to change the location of its future headquarters and the financial institution Caja Madrid purchased the building for $815 million in August 2007. In 2016 it was bought by Amancio Ortega, Europe's richest man and founder of global fashion group and Zara proprietor Inditex (ITX.MC), for $490 million euros through his property investment arm, Pontegadea Inmobiliaria, among the biggest property companies in Spain. He purchased the tower from Abu Dhabi tycoon Khadem al-Qubaisi, whose fund had exercised a last-minute buy option from Spanish lender Bankia (BKIA.MC), its previous owner.It was built by a joint venture of Dragados and Fomento de Construcciones y Contratas.

Source: Wikipedia