The Twin Towers were the centerpieces of the World Trade Center complex. At 110 stories each, 1 WTC (North Tower) and 2 WTC (South Tower) provided nearly 10-million-square feet of office space for about 35,000 people and 430 companies. They were the tallest buildings in New York City, and for a brief period upon their completion, they were the tallest buildings in the world. They attracted roughly 70,000 tourists and commuters every day.