An 80-story office building set to open at the World Trade Center will be the third completed skyscraper at the site where the twin towers stood.
Monday's ribbon-cutting for the 1,079-foot 3 World Trade Center marks a major step in the rebuilding of the site.
The new $2.7 billion building, designed by Pritzker Prize-winning architect Richard Rogers, is the fifth-tallest building in New York City.
Its 62-foot lobby faces the National Sept. 11 Museum. It consists of an 80-story tower straddling a 17-story "podium."
Tenants will include the advertising firm GroupM and consultants McKinsey & Co.
Construction of the building was stalled for years by lack of financing and disputes between developer Larry Silverstein and the Port Authority of New York and New Jersey.
The ribbon-cutting will be around 11 a.m.