etronas tower is a symbol of Malaysia. It is at a famous of the twin skyscrapers located in Malaysia’s capital city, Kuala Lumpur. Based on the rank, it has been the tallest tower in the world from 1998 to 2004. It is built for Petronas headquarters. Its circle structure contains about 88 stories of occupied space and the pyramid-shaped in its peach covered by flat steels. The service building in the east of Petronas contains many services that are needed for the operational building, by spouting heat from the air conditioning system for all 88 levels in both towers. From the shape, there is a little bridge in the middle of both towers which function as an evacuation route in damage situation. That bridge is called Double-decked sky bridge.