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Workers stand in a shaft of sunlight on the 105th floor of the One World Trade Center after the final piece of the building's spire was attached in New York May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks. REUTERS/Lucas Jackson ( USA-WORLDTRADECENTER/ )

A view of fog over the New York skyline as seen from the One World Trade Center during sunrise in New York May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks. REUTERS/Lucas Jackson ( USA-WORLDTRADECENTER/ )

Iron workers look at names signed inside of the final piece of the spire on top of the One World Trade Center in New York May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks. REUTERS/Lucas Jackson ( USA-WORLDTRADECENTER/ )

Iron workers lean out as they watch a crane lift the final piece of the spire to the top of the One World Trade Center in New York May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks. REUTERS/Lucas Jackson ( USA-WORLDTRADECENTER/ )

Iron workers take photographs as they watch a crane lift the final piece of the spire to the top of the One World Trade Center in New York May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks. REUTERS/Lucas Jackson ( USA-WORLDTRADECENTER/ )

People walk along the Hudson River across from New York's One World Trade Center in Jersey City, New Jersey, May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet (541 meters) and helping fill a void in the skyline left by the Sept. 11, 2001 attacks. REUTERS/Gary Hershorn ( USA-WORLDTRADECCENTER/ )

The final piece of the One World Trade Center spire is attached to the building by ironworkers in New York May 10, 2013. The tower now rises to a symbolic 1,776 feet, making it the tallest building in the western hemisphere. Gary He/INSIDER IMAGES/Handout via Reuters ( USA-WORLDTRADECENTER/ )

The New York skyline stretches into the horizon as seen from the One World Trade Center in New York May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks. REUTERS/Lucas Jackson ( USA-WORLDTRADECENTER/ )

New York Harbor stretches out as seen from the One World Trade Center in New York May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks. REUTERS/Lucas Jackson ( USA-WORLDTRADECENTER/ )

An iron worker leans on a safety fence to look at the New York skyline after watching a crane lift the final piece of the spire to the top of the One World Trade Center in New York May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks. REUTERS/Lucas Jackson ( USA-WORLDTRADECENTER/ )

The final piece of the One World Trade Center spire is attached to the building by ironworkers in New York May 10, 2013. REUTERS/Gary Hershorn ( USA-WORLDTRADECENTER/ )

Graffiti is written on a steel girder on the 105th floor of One World Trade Center after the final piece of the building's spire was attached in New York May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks. REUTERS/Lucas Jackson ( USA-WORLDTRADECENTER/ )

NEW YORK, NY - MAY 10: The Manhattan skyline with One World Trade Center, now the tallest building in the United States, is viewed on May 10, 2013 in New York City. After more than 11 years of construction and planning, One World Trade Center reached its final height Friday morning of 1,776 feet. When it opens for business in 2014, One World Trade centerwill be home to companies including Conde Nast and Vantone Holdings China Center. One World Trade Center is built on the site where the September 11, 2001 attacks toppled the original World Trade Center towers. (Photo by Spencer Platt/Getty Images) ( 168501538 )

The final section of the spire sits on top of One World Trade Center on May 10, 2013 in New York after it was fully installed on the building's roof. With the spire now in place, One WTC will stand 1,776 feet (541 meters) high, making it the tallest building in the Western Hemisphere. TIMOTHY A. CLARY/AFP/Getty Images ( 519616895 )

Iron workers pose for photos on the roof of One World Trade center before the final piece of spire is hoisted in place, Friday, May 10, 2013 in New York. The addition of the spire, and its raising of the buildingís height to 1,776 feet, would make One World Trade Center the tallest structure in the U.S. and third-tallest in the world. (AP photo/Mark Lennihan) ( World Trade Center Spire )

NEW YORK, NY - MAY 10: One World Trade Center, now the tallest building in the United States, is viewed on May 10, 2013 in New York City. After more than 11 years of construction and planning, One World Trade Center reached its final height Friday morning of 1,776 feet. When it opens for business in 2014, One World Trade center will be home to companies including Conde Nast and Vantone Holdings China Center. One World Trade Center is built on the site where the September 11, 2001 attacks toppled the original World Trade Center towers. (Photo by Spencer Platt/Getty Images) ( 168501333 )

New York's One World Trade Center stands tall on the skyline of Lower Manhattan as people play in a park in Hoboken, New Jersey, May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet (541 meters) and helping fill a void in the skyline left by the Sept. 11, 2001 attacks. REUTERS/Gary Hershorn ( USA-WORLDTRADECCENTER/ )

The One World Trade Center casts shadow over the Hudson River as the final piece of spire is attached to the building by ironworkers in New York May 10, 2013. The tower now rises to a symbolic 1,776 feet, making it the tallest building in the western hemisphere. Gary He/INSIDER IMAGES/Handout via Reuters ( USA-WORLDTRADECENTER/ )

A view of fog over the New York skyline as seen from the One World Trade Center during sunrise in New York May 10, 2013. Workers cheered and whistled as they completed the spire on New York's One World Trade Center on Friday, raising the building to its full height of 1,776 feet and helping fill a void in the skyline left by the September 11, 2001 attacks. REUTERS/Lucas Jackson ( USA-WORLDTRADECENTER/ )

Two people look out at One World Trade Center in New York as seen across the Hudson River in Jersey City, New Jersey, May 10, 2013. The final piece of the building's spire will be attached later this morning. REUTERS/Gary Hershorn ( USA-WORLDTRADECCENTER/ )