The Petronas Twin Towers (88 floors) was considered the world’s tallest building when completed in 1998. And remained so till 2004 when Taipei surpassed it with 101 floors. Now the tallest building of the world is ‘Burj Khalifa‘. The other comparable towers were the Willis Towers and the World Trade Center Twin-Towers with 110 floors. Moreover, quite often tall pinnacles or antennas are erected at the top to increase height rating. It was firstly built for National Petroleum Company of Malaysia.