![]() The tower structure is composed of a “hybrid” system combining a robust concrete core with a perimeter ductile steel moment frame. It provides a world-class model of life safety and security, energy efficiency and environmental sustainability. It also includes a 50-foot high lobby, tenant amenity spaces, a two-level observation deck at 1,242 feet (379m) above ground, a “sky” restaurant, parking, retail facilities and access to public transportation networks. The tower consists of 71 levels of office space and eight levels of MEP space. One World Trade Center’s program includes 3 million square feet of new construction above ground and 500,000 square feet of construction of subterranean levels. The addition of a 408 feet (124m) tall spire rising from the main roof completes the tower as it soars to its symbolic height. With its main roof at 1368 feet (417m) above ground, it is designed to reach the same height as the original towers. One WTC rises from a footprint that, at 200 feet by 200 feet, is the same size as those of the original Twin Towers. ![]() One World Trade Center serves as a national monument as well as a tribute to the “freedoms” emanating from the Declaration of Independence adopted by the United States of America in the year 1776. Standing at 1,776 feet (541 m), One WTC is the tallest building in the country. WSP was an Award Winner for the One World Trade Center project in the 2013 NCSEA Annual Excellence in Structural Engineering awards program (Category – New Buildings over $100M).
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