"The World Trade Center was unique in its structure. Both towers were an unprecedented 110 stories tall. The South Tower stood at 1,368 feet, while North Tower was slightly shorter at 1,362 feet. From the observation deck of the South Tower, it was possible to see 45 miles in every direction (building big). Available on each of the 110 floors was 43200 square feet of office space, almost an acre of land. There were also seven levels underground that included shopping, services, and three major New York subway stations, the IRT, BMT, and IND. The WTC also used an elevator system that involved two unique sky lobbies on the 44th and 78th floor." -- Revitalization of Lower Manhattan: The World Trade Center