The original 2 World Trade Center (also known as the South Tower, Tower 2, Building Two, or 2 WTC) was one of the Twin Towers in the original World Trade Center in New York City. The Tower was completed and opened in 1973 at a height of 415 meters (1,362 ft) to the roof, distinguishable from its twin, the North Tower (1 World Trade Center), by its outdoor observation deck and the absence of a television antenna. Both the South Tower and the North Tower had mechanical floors, and the same type of walls. On the 107th floor of this building was a popular tourist attraction called "Top of the World Trade Center Observatories," and on the roof was an observation deck accessible to the public and a disused helipad at the center. The address of this building was 2 World Trade Center with the WTC