comparable steel building. Supported by 23-by-23 metre concrete cores[14] 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.[15] Below the twin towers is Suria KLCC, a shopping mall, and Dewan Filharmonik Petronas, the home of theMalaysian Philharmonic Orchestra