FILE - In this April 2, 2014, file photo, the Willis Tower, in downtown Chicago is seen through the window of an Osprey helicopter traveling with President Barack Obama. The famed skyscraper on Thursday, Dec. 19, 2019, became the largest building in the nation to earn the highest level of energy efficiency. Building owner Equity Office, the U.S. office arm of private-equity giant Blackstone Group, made the announcement that the 110-story skyscraper reached the Leadership in Energy and Environmental Design, or LEED, Platinum certification, the Chicago Tribune reported. (AP Photo/Carolyn Kaster, File)
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