One World Trade Center under construction

One World Trade Center, the central skyscraper at Ground Zero, stands under construction on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

One World Trade Center, the central skyscraper at Ground Zero,...

One World Trade Center, the central skyscraper at Ground Zero, stands under construction on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

One World Trade Center, the central skyscraper at Ground Zero,...

One World Trade Center, the central skyscraper at Ground Zero, stands under construction on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

One World Trade Center, the central skyscraper at Ground Zero,...

One World Trade Center, the central skyscraper at Ground Zero, stands under construction on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

One World Trade Center, the central skyscraper at Ground Zero,...

One World Trade Center, the central skyscraper at Ground Zero, stands under construction on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

One World Trade Center, the central skyscraper at Ground Zero,...

Two men look up at One World Trade Center, the central skyscraper under construction at Ground Zero on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

Two men look up at One World Trade Center, the central skyscraper...

A construction worker takes a break outside of One World Trade Center, the central skyscraper under construction at Ground Zero, on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

A construction worker takes a break outside of One World Trade...

One World Trade Center, the central skyscraper at Ground Zero, stands under construction on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

One World Trade Center, the central skyscraper at Ground Zero,...

People walk past One World Trade Center, the central skyscraper under construction at Ground Zero, on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

People walk past One World Trade Center, the central skyscraper...

A construction worker looks up at One World Trade Center, the central skyscraper under construction at Ground Zero, on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

A construction worker looks up at One World Trade Center, the...

One World Trade Center, the central skyscraper at Ground Zero, stands under construction on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

One World Trade Center, the central skyscraper at Ground Zero,...

One World Trade Center, the central skyscraper at Ground Zero, stands under construction on January 30, 2012 in New York City. The price tag for One World Trade has recently been valued at $3.8 billion, which would make it the world's most expensive new office tower. Most of the cost overruns are due to the security measures being taken in the design of the building which sits on a site that has been bombed twice by terrorists. To offset the costs of One World Trade Center, which is being built by the Port Authority of New York and New Jersey, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure. The 1,776-foot skyscraper is expected to be completed at the end of 2013. Photo: Spencer Platt, Getty Images / 2012 Getty Images

One World Trade Center, the central skyscraper at Ground Zero,...

One World Trade Center, now up to 90 floors, rises above the lower Manhattan skyline and the Hudson River, Tuesday, Jan. 24, 2012 in New York. The tower is scheduled to be completed in 2013. Photo: Mark Lennihan, Associated Press / AP

One World Trade Center, now up to 90 floors, rises above the lower...

One World Trade Center, now up to 90 floors, rises above the lower Manhattan skyline and the Hudson River, Tuesday, Jan. 24, 2012 in New York. The tower is scheduled to be completed in 2013. Photo: Mark Lennihan, Associated Press / AP

One World Trade Center, now up to 90 floors, rises above the lower...

One World Trade Center glows in the lower Manhattan skyline, Monday, Jan. 16, 2012 in New York. When completed the skyscraper will be 105 floors and 1776 feet (541 meters). (AP Photo/Mark Lennihan) Photo: Mark Lennihan, Associated Press / AP

One World Trade Center glows in the lower Manhattan skyline,...

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One World Trade Center under construction