 A succession of skyscrapers were built throughout the 1970s, culminating with Houston's tallest, the 75-floor, tall JPMorgan Chase Tower (formerly the Texas Commerce Tower), designed by I. M. Pei and completed in 1982.As of 2010, it is the tallest man-made structure in Texas, the 12th-tallest building in the United States and the 48th-tallest skyscraper in the world.Pennzoil Place, designed by Philip Johnson and built in 1976, is Houston's most award-winning skyscraper and is known for its innovative design.