Fifteen years after the 9/11 attacks, tens of thousands of people are again working at the site of the World Trade Center in the new skyscrapers that have been built. NY1's Michael Scotto takes a look at what it's like to work in them and filed the following report.

Jesse Comart's desk on the 45th floor of 4 World Trade Center overlooks the September 11th memorial. 

His view is a daily reminder of the horror that happened here 15 years ago.  

"I've been here for 11 months and, you know, that feeling hasn't faded," he says.

For the people who work at the World Trade Center site, it's hard to escape that September day.

When the Media company Mic moved to the 83rd floor of One World Trade Center a few weeks ago, many millennial staffers confessed their parents were concerned. 

"Folks here are young and their parents were nervous," says Mic Co-Founder Jake Horowitz.

Some of the employees at the technology company MediaMath, where Comart works, were nervous, too. 

When the company said it might move from its Midtown location, workers were polled about the possible change.

Seventy percent, Comart says, didn't want to go, in part because of security concerns.

The opposition disappeared once those workers got to tour the space MediaMath was thinking of renting.

Now, Comart says, they're enjoying the open floor plan and modern amenities. They are not alone.

The people who work here say they've been reassured by the massive security presence both inside and outside the buildings.    

NY1 encountered that security just trying to shoot video outside One World Trade Center.

The Port Authority, which owns the site, has 1,000 employees across 11 floors in 4 World Trade Center.

About 500 of them worked here 15 years ago including Glenn Guzi. 

He says returning to an office there full-time feels right. 

"We needed to fix what happened to us and part of that in fixing what happened to us is just coming back home," says Guzi.

Jake Horowitz of Mic was in ninth grade on 9/11.

"You're never going to forget what happened but it also feels like we've turned a chapter," he says.

That new chapter is bringing workers and life back to the World Trade Center.