The stiff core forms a rigid backbone up the center of the skyscraper. This design gives the owners plenty of space to arrange apartments, movie theaters, and shops on each floor. Plus, the stiff inner core acts like the spine of the human body and provides extra structural support for the skyscraper against heavy winds. It also creates space for an elevator shaft. After all, who wants to climb 1,000 feet of stairs?
One of the world's tallest skyscrapers, the Chrysler Building in New York City, is strengthened by a stiff inner core. Super job!