Buttressed core

A buttressed core is a structural system for high buildings, consisting of a hexagonal core reinforced by three buttresses that form a Y shape.

The buttressed core was invented by the Skidmore, Owings & Merrill engineer Bill Baker. It was first used in Tower Palace III in Seoul, South Korea, completed in 2004. Its ability to support higher buildings than ever before was demonstrated by the Burj Khalifa in Dubai, completed in 2009. Jeddah Tower in Jeddah, Saudi Arabia, is under construction as of January 2025, and estimated to be completed in 2028 or 2029. It was planned for the never-built Crown Las Vegas in Las Vegas.

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