Petronas Twin Towers, pair of skyscraper office buildings in Kuala Lumpur, Malaysia, that are among the world’s tallest buildings. The Twin Towers, built to house the headquarters of Petronas, the national petroleum company of Malaysia, were designed by the Argentine-born American architect Cesar Pelli; they were completed in 1998. The plan for each tower is identical: an eight-lobed circular structure that contains 88 stories of occupiable space and a pyramid-shaped pinnacle surmounted by a slender steel spire. Both rise to a height of 1,483 feet (451.9 metres), which includes 242 feet (73.6 metres) for pinnacle and spire. Each building is supported by 16 large columns around its perimeter, which, along with the rest of the frame, are made of high-strength, steel-reinforced concrete rather than of structural steel; the exterior sheathing consists of stainless steel and glass. A skybridge two stories tall links the two towers between the 41st and 42nd stories.
In 1996, after the spires had been attached to the buildings (and each had thus reached its full height), the Petronas Twin Towers were declared the world’s tallest buildings, eclipsing the former record holder, the 110-story Sears (now Willis) Tower in Chicago. The roof of the Sears Tower was actually more than 200 feet (60 metres) higher than those of the Twin Towers, but the spires on the towers’ pinnacles were regarded as integral parts of the overall architectural structure (see Researcher’s Note: Heights of buildings). The Twin Towers, in turn, lost their preeminent status in 2003 after a spire was put in place atop the Taipei 101 (Taipei Financial Center) building, in Taipei, Taiwan, and that structure reached a height of 1,667 feet (508 metres).
Due to the huge cost of importing steel, the towers were constructed on a cheaper radical design of super high-strength reinforced concrete. High-strength concrete is a material familiar to Asian contractors and twice as effective as steel in sway reduction; however, it makes the building twice as heavy on its foundation as a comparable steel building. Supported by 23-by-23 metre concrete cores and an outer ring of widely spaced super columns, the towers use a sophisticated structural system that accommodates its slender profile and provides 560,000 square metres of column-free office space. Below the twin towers is Suria KLCC, a shopping mall, and Petronas Philharmonic Hall, the home of the Malaysian Philharmonic Orchestra.
No trip to KL would be complete without a visit to the world’s tallest twin towers. The skyscrapers are utterly stunning, particularly when illuminated at night. The Twin Towers Visit Operations is open Tuesday through Sunday and tickets are released at 8:30 a.m. on a first-come, first-served basis. To avoid disappointment, you can purchase your ticket in advance via online ticketing or at the Ticketing Counter, Concourse Level.
Notable events
On 15 April 1999, Felix Baumgartner set the world record for BASE jumping (since broken) by jumping off a window cleaning crane on the Petronas Towers.
- Thousands of people were evacuated on 12 September 2001 after a bomb threat the day after the September 11 attacks destroyed the World Trade Center towers in New York City. Bomb Disposal squads found no bomb in the Petronas towers but they evacuated everyone. Workers and shoppers were allowed to return three hours later, around noon. No one was hurt during the evacuation.
- On the evening of 4 November 2005, a fire broke out in the cinema complex of the Suria KLCC shopping centre below the Petronas Towers, triggering panic among patrons. There were no reports of injuries. The buildings were largely empty, except the shopping mall, Suria KLCC, because of the late hour; the only people involved were moviegoers and some diners in restaurants.
- On the morning of 1 September 2009, French urban climber Alain “Spiderman” Robert, using only his bare hands and feet and with no safety devices, scaled to the top of Tower Two in just under 2 hours after two previous efforts had ended in arrest. In his first attempt on 20 March 1997, police arrested him at the 60th floor, 28 floors away from the “summit”. The second attempt on 20 March 2007, exactly 10 years later, was also stopped on the same floor, though on the other tower.