Katherine Rushton of The Telegraph  shares her experience touring the new One World Trade Center, the tallest building in the Americas, prior to its opening.
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| One World Trade Centre, left, and the view from the top, right | 
 
It is the coldest day Manhattan has seen for more than 70 years, but it is not 
  the biting, whipping, whistling wind that brings tears to my eyes. All of 
  New York is laid out before me.
The Empire State Building, once the tallest structure in the world, pokes up 
  above the rest of Manhattan looking like one of the thousands of plastic 
  replicas sold in the tourist shops below. The building I stand on, at the 
  southern tip of the island, casts a dark shadow that stretches to the other 
  side of Houston, two and a half miles north.
This is One World Trade Center, or the "Freedom Tower" as it used to be known, 
  erected close to the site of the original World Trade Center complex which 
  was destroyed in the terrorist attacks of September 11 2001.
It has taken 26,000 people eight years to build the new complex, which has 
  gone over schedule and over budget several times. The tower itself was 
  originally expected to cost around $3bn, but that figure now stands just shy 
  of $4bn.
The building is close to completion, however. It was topped out in August 
  2012, and a “spire” was later attached, taking its overall height to 1776 
  feet –a good 400 feet more than the original Twin Towers. 
Last year, it was officially recognised as the tallest building in the Western 
  Hemisphere, following considerable controversy over whether the spire was an 
  adornment or “integral” to the building.
The first tenants have now started to move into their offices. The mirrored, 
  cubist edifice is expected to open later this year, finally restoring to the 
  public a part of the city that has been out of bounds since 9/11.
“It’s a huge step — it’s no longer ground zero, it’s the World Trade Center 
  now,” said Douglas Durst, whose company, the Durst Organization, has bought 
  a stake in the building from the Port Authority of New York and New Jersey.
“It’s been surrounded for 12 years by barricades, inaccessible. This is going 
  to make a dramatic difference.”
Around 55pc of the building has been let so far, to tenants including Conde 
  Nast, the publisher of magazines such as Vogue and Wired and Vantone 
  Industrial, the Chinese property group.
Talks with finance and media companies are still ongoing, and Durst estimates 
  it will reach around 70pc occupancy by the time the building opens.
Legends Hospitality Group has taken the observatory desk on the 101st and 
  102nd floors, around 1,300 feet above ground. The whole building promises to 
  be a big business - the Empire State Building made $63m in profits last 
  year.
But of course, One World Trade Center will attract tourists for more than just 
  its spectacular view.
The building is inextricably linked with one of the most horrific acts of 
  terrorism in the world, and is likely to become a place of pilgrimage for 
  Americans who want to pay tribute to those that died in the atrocity.
There are delicate nods to the Twin Towers throughout the building. In the 
  cavernous entrance hall, the walls are lined with white marble slabs from 
  the same quarry used to decorate the first World Trade Center.
With the nostalgia, however, comes a fear that the new building could become a 
  target once again. Its design has been through a number of revisions with 
  this in mind. 
The original architect, Daniel Libeskind, proposed dedicating the upper floors 
  to a series of “sky gardens”, so that offices would be restricted to the 
  lower floors. The eventual structure, adapted and designed by David Childs, 
  includes a 57m concrete pedestal to ward off terrorist attacks from ground 
  level.
Inside, the walls and floors are very thick: 14,000lbs of concrete per square 
  inch, compared to the 900lbs that is standard for skyscrapers. There is a 
  waterproof fire lift, and lifts and multiple stairways are housed in a 
  reinforced column “like a bunker”.
Wall Street gossips claim there are missile launchers on the roof, although 
  the building’s developers are quick to scotch that rumour.
“The safest place to be in any incident in New York will be One World Trade 
  Center. It is the safest building on the planet,” says Mr Durst.
What about if another plane is hijacked? “There is no building safe from a 
  plane,” he says, adding that tight security on aircrafts means the odds of 
  anyone emulating the attack that destroyed the Twin Towers are very slim 
  indeed.
Even so, the building’s developers are offering tenants an extra carrot. The 
  rate for the lower two thirds of the building is $75 per square foot per 
  year, but the city and state of New York are offering incentives that reduce 
  that figure to $69.
Larry Silverstein, the property developer who owned the lease on the World 
  Trade Center complex in 2001, has recouped his money from the insurers. It 
  now falls to the publicly-funded Port Authority, which long ago gave up hope 
  that this would be a money-spinner, even in the medium term.
If it was fully occupied, at market rate, One World Trade Center would garner 
  around $120m a year, and take around 35 years to recoup the costs of 
  construction.
But, as one of the workers on site says, that’s hardly the point. “This 
  building wasn’t built to make money. It was built to demonstrate something 
  to the world.”
Peter Forchetti heads Pleasant Village Estates Inc., a construction and development company headquartered in New York. Learn more about Mr. Forchetti and his firm here.