AT&T Corporate Center vs Sapphire of Istanbul

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The Franklin Center is a 60-story supertall skyscraper completed in 1989 as the AT&T Corporate Center to consolidate the fundamental place headquarters of the American Telephone & Telegraph Company (AT&T). It stands at a height of 1,007 feet (307 m) and comprises 1.7 million sq ft (160,000 m2) in the Loop area of downtown Chicago. It's located northeast of the Willis Tower and two blocks east of the Chicago River with a main address of 227 West Monroe Street and an address of 100 South Franklin Street.

From the Loop community area of Chicago that is downtown. The building is the tallest built in the 20th century's last quarter in Chicago. It's the 5th tallest building in Chicago and the tallest in america. It contains office and retail space and a 350-space garage.Tishman Speyer acquired the property in 2004 and renamed the adjoining USG Building as Franklin Center in 2007 after USG relocated its offices. The name was afterwards applied to the complex.

Source: Wikipedia

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Istanbul Sapphire, or Sapphire, is a skyscraper located in the central business district of Levent in Istanbul, Turkey.

It was Istanbul's and Turkey's tallest skyscraper between 2010 and 2016, and the 4th tallest building in Europe when its construction was finished in 2010. Sapphire rises 54 floors above ground level, and contains an above-ground roof height of 238 meters: the construction has an overall structural height of 261 meters including its spire, which is part of the design rather than a radio antenna. Designed by Tabanl?o?lu Architects, it's a luxury and shopping residence mixed-use development managed by Kiler GYO. It's also the nation's first ecological skyscraper. As of 2020, Istanbul Sapphire is the 4th tallest skyscraper in Istanbul and Turkey, behind Metropol Istanbul Tower 1 (70 flooring / 301 metres including its twin spires) from the Ata?ehir district on the Asian side of the city; and the Skyland Istanbul Towers 1 and 2 (2 x 70 flooring / 293 metres), located adjacent to Türk Telekom Stadium at the Seyrantepe quarter of the Sar?yer district, on the European side.

Source: Wikipedia