The World Trade Center site refers to the 16 acres (65,000 m2) area of land in Lower Manhattan in New York City, that hosted both the original and new World Trade Centers. The land was originally underwater. The first World Trade Center complex of buildings stood on the site until it was destroyed in the September 11 attacks. The new World Trade Center complex is mostly complete and is built on the site. The Port Authority of New York and New Jersey owns most of the land. The site is overseen by Studio Daniel Libeskind, Silverstein Properties, and the Lower Manhattan Development Corporation.