Park Tower, located at 800 North Michigan Avenue in Chicago, in the U.S. state of Illinois, is a skyscraper that was completed in 2000. At 844 feet tall with 70 floors — 67 floors for practical use, it is the twelfth-tallest building in Chicago, the 43rd-tallest building in the United States, and the 83rd-tallest in the world by architectural detail. It is one of the world's tallest buildings to be clad with architectural precast concrete . It is one of the tallest non-steel framed structures in the world—it is a cast-in-place concrete framed structure. This building was originally intended to be 650 ft tall. But later, the ceiling heights were increased allowing it to reach 844 ft .
The building occupies a footprint of 28,000 square feet . Because of the small footprint and the fact that it is a non-steel-framed concrete building, this is the first building in the United States to be designed with a tuned mass damper from the outset. While other skyscrapers in America have anti-sway systems, they were always added later. A tuned mass damper counteracts wind effects on the structure. Because of its massive weight, the damper has inertia that helps stabilize the building from swaying in the wind.
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