Price tag for World Trade Centre rises alongside building

Cost for Ground Zero tower estimated at more than $3.8bn, making it worlds priciest office tower
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One World Trade Center, the central skyscraper at Ground Zero, stands under construction (All images courtesy of Getty Images)
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The price tag for One World Trade has recently been valued at $3.8bn, making it the world's most expensive new office tower
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The new figure is up $700m from the latest public estimate
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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
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To offset the costs of One World Trade Center, higher bridge and tunnel tolls have been instated and there has been a reduction in spending on transportation infrastructure
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The 1,776-foot skyscraper is expected to be completed at the end of 2013
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The One World Trade Center is being built by the Port Authority of New York and New Jersey
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Continuing delays also have caused the site in the middle of Lower Manhattan to be boarded up for more than ten years