Petronas (Twin) Towers, Kuala Lumpur, Malaysia

Height (Architectural): 452 mHeight (Occupied): 375 mFloors: 88Observation Decks: 370 m

Construction of the Petronas Towers started in 1992 and completed in 1998. They were the tallest buildings in the world 6 years - from 1998 to 2004, and now remain the world's tallest twin buildings. Buildings are designed by Argentine Cesar Pelli & Associates. Because of the depth of the bedrock, the buildings were built on the world's deepest -120-meter foundations. Tower 1 was built by a Japanese consortium led by the Hazama Corporation while Tower 2 was built by Samsung C&T and Kukdong Engineering & Construction. The towers are constructed largely of reinforced concrete, facade material is stainless steel, aluminum and glass. The towers feature a sky bridge between the two towers on 41st and 42nd floors, which is the highest 2-story bridge in the world. The bridge is 170 m (558 ft) above the ground and 58 m (190 ft) long. Each building gross floor area is 197,500 m2 / 2,125,872 ft2. Tower One is fully occupied by Petronas ( Malaysian oil and gas company), while the office spaces in Tower Two are mostly available for lease to other companies.