The Petronas Twin Towers in Kuala Lumpur Malaysia were the world's tallest towers from 1998 to 2004, if measured from the level of the main entrance to the structural top. Designed by Cesar Pelli, an Argentine-American architect, the 88-floor towers are constructed largely of reinforced concrete, with a steel and glass facade designed to resemble motifs found in Islamic art, a reflection of Malaysia's dominant Muslim religion. Petronas, Malaysia's national oil company, set out to build the world's tallest building in 1992, containing 395,000 sq.m (4.25 million sq.ft) of office space plus a shopping mall below. In 2004, it has been surpassed in height by the Taipei 101 (508m-1667ft) tower. A marvellous achievement of engineering and architecture!