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September 11, 2001 changed the United States of America forever.

About 3,000 people died, including men, women and children.

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Americans at home watched in horror as two planes hijacked by terrorists crashed into the towers of the World Trade Center, falling or killing those inside.

Wall Street firm devastated by 9/11 and flourishes 2 decades later

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completed in 1973 As the tallest buildings in New York City, the north tower rose to 1,730 feet with a large antenna and the south tower rose to 1,362 feet high.

Each massive tower weighed over 250,000 tons and had 110 stories.

Inside there were 99 lifts, 21,800 windows and the size of each floor was one acre.

The North Tower and South Tower provided approximately 10 million square feet of office space for approximately 35,000 people and 430 companies.

The World Trade Center complex also had its own zip code, 10048, and was surrounded by five other buildings, including a police desk at Twin Towers 5 WTC.

The towers attracted about 70,000 tourists and commuters every day.

Before 11 September, the Twin Towers were the symbol of the city.

However, when the minarets fell, the city fell with them.

However, life in the Big Apple did not stop, and just hours after the attack, then-Mayor Rudy Giuliani. promised to rebuild.

Four months later, newly appointed Mayor Michael Bloomberg Mortgage that “devotion” [himself] To build a better New York.”

Giuliani encouraged buildings to be built lower, according to quartz, and the US Model Building and Fire Code was amended pending an investigation.

according to a NIST (National Institute of Standards and Technology) release, the new codes “increased structural resistance to building collapse from fire and other incidents,” “requirement of third exit stairway for tall buildings,” “50 percent increase in width of all stairways in new high-rise buildings,” “Strengthened Addresses areas including making. Bonding of sprayed fire-resistant materials, criteria for proper installation and inspection, “Improving the reliability of active fire protection systems,” “Strong elevators for use by emergency responders in lieu of an additional ladder.” A new class is needed to “make exit path markings more prevalent and more visible” and “ensure effective coverage in a building for emergency response radio communications.”

In a recent op-ed, Michael Lewis of the Wall Street Journal has noted the importance of 2007 FEMA ‘Design for Site and Urban Security: Guidance against Potential Terrorist Attacks,’ Which promoted a strategy of “three layers of defence”, similar to those surrounding medieval castles.

He writes that, at the same time, many measures endorsed by FEMA are invisible to prevent users of buildings from feeling unsafe.

Security is woven into urban development especially in New York.

And yet, Lewis says, 20 years later skyscrapers and supertall buildings still fill the city’s skies.

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NS Council Report on Tall Buildings and Urban Housing 84 percent of the world’s skyscrapers over 200 meters have been built in the past two decades – although most are now outside the US

According to many experts in the field, this is because of better building science and increased confidence over the past 20 years.

Carl Galliotto, president of global design and architecture firm HOK, “There is a direct link between developments in building science related to high-rise construction and the notion of improved safety that allowed Supertall towers in New York to be commercially viable.” Quartz said.