Original: The bulk of the investigation of 7 World Trade Center was delayed until after reports were completed on the collapse of the World Trade Center twin towers.
Simplified: 7 World Trade Center is a building in New York City located across from the World Trade Center site in Lower Manhattan. The building you see in the photo is the new 7 World Trade Center the original 7 World Trade Center was completed in 1987 and destroyed on September 11, 2001 along with the rest of the buildings in the World Trade Center plaza.