Bank of Oklahoma

BOK Tower (formerly known as One Williams Center) is a skyscraper in Downtown Tulsa, Oklahoma. At 203 m (667 ft) in height, the 52-story tower was the tallest building in any of the five "Plains States": Oklahoma, Kansas, Nebraska, North Dakota, and South Dakota, as well as the surrounding states of Missouri, Arkansas and New Mexico, until surpassed by Devon Tower in 2011. It was built in 1976 and designed by Minoru Yamasaki & Associates, the same architect who designed the World Trade Center's Twin Towers in New York City. This structure is very similar to the WTC towers in appearance and construction.