Photos show how New York City built the Freedom Tower in the wake of 9/11

In 2009, Port Authority officials announced the signatory of the building's first lease: the Chinese property developer Vantone Industrial Co. The tower is now home to Condé Nast, Moody’s, and Ameriprise Financial, among other organizations.

In an interview with Project Rebirth, Childs addressed the criticism of the project. "The discourse about Freedom Tower has often been limited to the symbolic, formal and aesthetic aspects, but we recognize that if this building doesn't function well, if people don't want to work and visit there, then we will have failed as architects," he said.

In 2012, there was some controversy about whether the building's spire qualified as part of its overall height. Without the spire, the tower stands at 1,368 feet — below 432 Park Avenue in New York and the Willis Tower and Trump International Hotel & Tower in Chicago.

By 2013, the Council on Tall Buildings and Urban Habitat had determined that the spire was indeed an architectural element, and therefore could be counted. At night, the spire emits a beam of light that stretches more than 1,000 feet into the sky.

The above image shows a view from inside the Freedom Tower, looking out. The building features the highest panoramic views in all of New York City.

In addition to gazing down at Manhattan, viewers can interact with LED displays and dine at a host of cafés and restaurants at the building's observation deck.

For Woolhead, who also photographed the city in the immediate aftermath of 9/11, capturing the rebuilding process was a source of deep pride.

"I feel a profound sense of obligation to produce work that will stand the test of time," he said, "much like the buildings that now stand as monuments, and as symbols of our age."