New York City's new One World Trade Center, nicknamed the "Freedom Tower," cost $4 billion and took eight years to build between the start of construction in 2006 and the first tenants moving in 2014.

Four years after opening its doors to the first tenants, about 8,000 people now work in the building for companies that include Condé Nast,

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Here's what the inside of One World Trade Center looks like, four years after the first tenants moved in.

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