THIRTEEN years after two hijacked passenger airplanes brought down the twin towers that soared over the New York skyline, the World Trade Center once again opened for business Monday.

    The 104-story building’s opening marks an emotional milestone for the United States.

    One World Trade Center is designed to be the safest commercial structure in the world and the premier commercial business address in New York.

    On Monday, publishing giant Conde Nast started operations from its new global headquarters at the 22nd floor of the western hemisphere’s new tallest building.

    Conde Nast occupies nearly 1.2 million square feet (111,480 sqm) to house its headquarters, along with the Vantone China Center, which has leased 190,000 square feet.

    The U.S. General Services Administration will lease more than 270,000 square feet of space under a 20-year agreement.

    Currently, One World Trade Center is more than 60 percent leased, with another 80,000 square feet going to the advertising firm Kids Creative, stadium operator Legends Hospitality, investment adviser BMB Group and Servcorp.

    Floors 100 to 102 will house an observation deck. The deck, called One World Observatory, will take visitors on an inspirational journey about the history of this iconic structure. The spectacular sightseeing venue is projected to draw an estimated 3.8 million annual visitors to the top of the fourth-tallest building in the world. The deck is approximately 1,250 feet (381 meters) above street level.

    One World Trade Center will also serve over 200,000 daily commuters and millions of annual visitors from around the world.(SD-Agencies)