COST IMPLICATION ON DESIGN AND METHOD OF BUILDING ELEMENTS Most high-rise building in the world use steel elements on their construction. In this case, reinforced concrete was used instead of conventional steel the decision was made to use reinforced concrete for the superstructure, rather than the more conventional steel framework found in most skyscrapers. The rationale was that Malaysia had far more workers experienced in concrete construction methods and the material was locally available. Importing the vast amounts of steel that the Petronas Towers would have required looked to be far more expensive, as well. So though a concrete skeleton was roughly half the cost of steel, it was also twice the weight. Moreover, reinforced concrete also has twice the ability of steel to withstand vibrations. The polishing faade is done with stainless steel extrusions and laminated glass covering or cladding the walls. This feature is able to minimize heat gain by reflecting harmful UV light and unwanted solar radiation. PLAN SHAPEThe plan shape of a building has an important effect on its costs. The circle is the most efficient enclosure of space, but the cost of building circular work makes it too expensive. Thedesign of thePetronas Twin Towersadopted on Islamic geometric forms and traditions. They chose a distinctive postmodern style to create a 21st-century icon for Kuala Lumpur. From an bird eye's view, the two interlocked squares creates an eight-pointed star and superimposing 8 circular arcs in inner angles of the star, hence, creating a 16-branched form. In each of the 16 inner angles are smaller curved column covers expressing the main structural columns of the building.

TOTAL HEIGHT Construction cost of a high rise building with increase in their height but this additional cost can be partly offset by the utilization of highly priced land and the reduced cost of external circulation works. Implication on cost of the total height of the Petronas Twin Towers is expensive than any low rise building because they need; to provide crane for construction purposes to provide expensive services such as lifts throughout the building the higher cost of related elements such as the footings, staircases, etc the increase in fire regulation requirements the increase in requirements for circulation areas (ie lifts) Increase maintenance cost (eg: cleaning and maintenance)

Service BuildingThe service building is to the east of the Petronas Tower and contains the services required to keep the building operational, such as dissipating the heat from the air-conditioning system for all 88 levels in both towers.

Elevator SystemIn office buildings the size of the Petronas Towers, it is important that there be an efficient elevator system that can handle the large numbers of people that use the elevators simultaneously. Since the towers are each 88 stories high, it is inefficient in terms of money, space, and time to have single elevators traveling directly from the bottom to the top of the building. This prompted the builders to design high-speed double-deck elevators.

STOREY HEIGHTThe Malaysian tallest twin building - Petronas Twin Towers is the anchor project of Kuala lumpur City Center or KLCC. Standing at 451.9M high, it has two towers of 88-storey office building. The Towers were recorded as the world's tallest towers from 1998 to 2004. The towers foundationis is about 120-meter depth and were built by Bachy Soletanche with massive amounts of concrete. This is because the depth of the bedrock, the buildings were built on the world's deepest foundations.With this features, KLCC is truly strong in feature and everything needs to be comply with its strong features especially the storey height of the building. Basically, the storey height of the building is largely determined by the needs of the user of the building. For a building many storeys like KLCC, it is important to make sure the storey height of each levels are the same. For the lower ground floor or the lobby, it needs to be taller than other floors for aesthetic value purposes. Besides that, as for the cost, it will be higher as the building has a lot of stories.

http://illumin.usc.edu/printer/181/the-petronas-towers/