Four World Trade Center (also known by its street address, 150 Greenwich Street) is a skyscraper under construction as part of the new World Trade Center complex in New York City. It is located on the southeast corner of the 16-acre World Trade Center site, where the original nine-story 4 World Trade Center stood. Pritzker Prize-winning architect Fumihiko Maki was awarded the contract to design the building, which will be 978 feet (298 m) tall. As of right now it is the second tallest skyscraper on the rebuilt World Trade Center site behind One World Trade Center, although Two World Trade Center and Three World Trade Center are planned to surpass the building's height upon completion. The total floor space of the building is expected to include 1.8 million square feet (167,000 square meter) of office and retail space. The building's groundbreaking took place in January 2008, and it is scheduled to be completed by 2013. The structural engineer for the building is Leslie E. Robertson Associates, New York City.