premise: The Burj Khalifa is a tall building with 163 floors.
hypothesis: The Burj Khalifa ( برج خليفة , Arabic for `` Khalifa Tower '' ; pronounced [ langˈbɝdʒ_kə ` li : fə ] ) , known as the Burj Dubai before its inauguration , is a megatall skyscraper in Dubai , United Arab Emirates . With a total height of 829.8 m including the antenna and a roof height of 828 m , the Burj Khalifa is currently the tallest structure in the world since topping out in late 2008 .