Module 3: The History of the World Trade Center - 911 Memorial
Classic Manhattan skyscrapers, dictated by the 1916 Zoning Resolution, traditionally followed a proportion where the upper tower occupied roughly half the footprint of the base (or respected tiered setback ratios). Architect Minoru Yamasaki disregarded this entirely. The Twin Towers rose as perfectly sheer vertical tubes, maintaining a constant 209-foot by 209-foot square floor plan from bedrock to roof. This introduced a massive, unprecedented volume of scale that dwarfed everything around it. III. Structural Engineering as an Enabler of Form
To build foundations in the wet soil adjacent to the Hudson River, engineers constructed a 3,500-foot-long concrete underground "bathtub". This prevented the Hudson from flooding the excavation site and became a marvel of civil engineering. IV. Economic Symbiosis and the Globalized City
The Port Authority razed 16 acres of active, small-scale industrial and electronic shops (the famous "Radio Row") to create a singular massive superblock. This permanently de-mapped several historical streets, detaching the complex from the traditional Manhattan street grid.
The pure scale of the towers necessitated engineering breakthroughs that altered skyscraper design forever:
The dedication of the World Trade Center on April 4, 1973, marked a physical and psychological shift in the skyline of New York City. Standing at 1,368 feet (North Tower/1 WTC) and 1,362 feet (South Tower/2 WTC), the Twin Towers were briefly the tallest buildings in the world. However, their true impact lay in their relationship with Manhattan. Spearheaded by David Rockefeller and the Port Authority of New York and New Jersey, the project was designed to aggressively pull the economic gravity of the city back to Lower Manhattan. II. Architectural Scale and the Grid Disruption
