The Taipei 101 or Taipei World Financial Center is with a height of 509 meters (1,670 feet) the fifth tallest building in the world. (After the Burj Khalifa, the Shanghai Tower, the Abraj Al Bait Towers and the One World Trade Center). But it is the tallest office block in the world (after the One World Trade Center). The Taipei 101 stands in Taipei, Taiwan and was built between 1999 and 2004.