On what day of which month were the two buildings in Lower Manhattan, developed by the American businessman Larry Silverstein, destroyed?
7 World Trade Center: 7 World Trade Center (7 WTC) refers to two buildings that have existed at the same location within the World Trade Center site in Lower Manhattan, New York City. 7 World Trade Center:  The original structure, part of the original World Trade Center, was completed in 1987 and was destroyed in the September 11 attacks. 7 World Trade Center:  Both buildings were developed by Larry Silverstein, who holds a ground lease for the site from the Port Authority of New York and New Jersey. Larry Silverstein: Larry A. Silverstein (born May 30, 1931) is an American businessman.
September 11