In an emblematic moment 13 years after the 9/11 attacks that brought down the original Twin Towers, the One World Trade Center reopened for business on Monday, Nov. 3. Known as America's tallest building, it welcomed it first new tenants including publishing giant, Conde Nast.

The reopening of the World Trade Center after the terrorist attack 13 years ago manifested a poignant breakthrough for both New Yorkers and the United States as a whole. BBC News reported employees of the publishing group, Conde Nast moved into the 104-storey One World Trade Center.

The new $3.9 billion World Trade Center skyscraper now dominates the Manhattan skyline. According to USA Today, it is the centerpiece of the 16-acre five-tower complex where the destroyed Twin Towers formerly built. It is also the place where more than 2,700 people died on Sept. 11, 2001, buried under smoldering mounds of scorching wreckages.

Approximately 175 executives of the publishing group that circulates magazines like "The New Yorker" and "Vanity Fair," filed through the doors of the building on Vesey Street, just steps from the memorial and museums established at the site where the Twin Towers once built. Conde Nast Vice President and spokeswoman Patricia Rockenwagner said that by early 2015, about 3,000 more employees will arrive.

The iconic Manhattan milestone, World Trade Center, collapsed 13 years ago after being struck by hijacked airliners flown by Al-Qaeda militants. As reported by Rappler, the new tower is 1,776 feet tall, a height representing the year the United States declared its independence from Britain.

"The New York City skyline is whole again, as One World Trade Center takes its place in Lower Manhattan," the Port Authority of New York and New Jersey Executive Director Patrick Foye, the owner of both the building and the World Trade Center site.

"One World Trade Center sets new standards of design, construction, prestige and sustainability; the opening of this iconic building is a major milestone in the transformation Lower Manhattan into a thriving 24/7 neighborhood," Foye continued.

Conde Nast CEO Charles Townsend considered America's tallest building as the "most secure office building in America." According to Fox News, publishing giant Conde Nast will take over five floors of the building. And in January, the company will spread across floors 20 to 44 of the building.

Conde Nast Director of Policies and Controls John Duffy, who worked in the World Trade Center in the '80s, recognized that some people will be anxious and feel they could be "potential targets again." However, he said authorities have worked hard to make a new building that is "probably indestructible."

"Some people are nervous, some people are just excited to move downtown and start a transformation for the company, to help revitalize lower Manhattan," Duffy stated.

Architect David Childs designed One World Trade Center that opened Monday. It has become a Big Apple landmark of its own, with simple lines, a needle-like tip and reflected windows that sparkle luminously in the sunlight. It is operated by the Durst Organization and owned by a governmental agency, Port Authority of New York and New Jersey.

According to Agence France-Presse, Durst Organization spokesperson Jordan Barowitz said 60 percent of the office space in the building is already leased. The new World Trade Center is open for other tenants as well, including the China Center New York, Legends Hospital Group and the General Services Administration, which supports the basic functions of federal agencies.

The reopening of the World Trade Center is considered as a "great day" for New York. It is an outstanding beacon for New York's business district. The One World Trade Center has a sustainable design at its core that incorporates renewable energy, interior day illumination, the reuse of rainwater and recycled construction materials.

The first new World Trade Center structure that opened this November has remarkable safety constructions. The building features dense fireproofing, biochemical filters, extra-wide pressurized stairs, multiple backup emergency lighting and concrete protection for all sprinklers.

The first World Trade Center building is part of the Four World Trade designed by Japanese architect Fumihiko Maki. Two other others are also rising on the site's southeast end. The buildings are Four World Trade Center whose anchor tenant is the Port Authority and the Three World Trade Center that is gradually going up.    

After years of political, financial and legal internal strife that threatened to disrupt the project, the eight-year construction of the new World Trade Center building came.