Taipei 101 is a landmark supertall skyscraper in Xinyi District, Taipei, Taiwan. The building was officially classified as the world's tallest in 2004, and remained such until the opening of Burj Khalifa in Dubai in 2010. In 2011, the building was awarded the LEED platinum certification, the highest award according the Leadership in Energy and Environmental Design (LEED) rating system, and became the tallest and largest green building in the world.