5. 2 World Trade Center
Estimated Cost: $4 Billion
Since September 11, the area where the World Trade Centers used to stand, has been a constant construction zone. Though the long-awaited One World Trade Center is completed, the entire development still has a ways to go. With its complicated design, developers estimate the costs of 2 World Trade Center will surpass those of its Freedom Tower neighbor. Once completed, it will be home to 80 floors and nearly three million square feet of office, retail and amenity space.
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