Monday marks one week since the tragedy and it isn't an easy day for employees who returned to work.
Some stood outside for quite some time while others shared a hug.
On Monday night, St. Bartholomew's Episcopal Church hosted a non-denominational service to pray for the victims, and for employees returning to work.
"It so obviously touched our community," said Rev. Peter Thompson of St. Bartholomew's Church. "A lot of people are grieving, they're struggling, they're in fear and we thought it was important to come together. So, that was why I think we had to come together and make sure the memory isn't forgotten and that we can go on every single day to do the things we come here to do."
Not every office is reopening yet. The NFL, which is headquartered in the building, told employees to work remotely through at least Friday.
Blackstone employees have the choice to return to the office Monday or to work remotely.
"You think about your family, your loved ones, you think about the lives that were lost, and all the fear that came to us on Monday, but we are here and we are happy to be together," said Blackstone employee Erma Hernandez.
Blackstone real estate executive Wesley LePatner was among those who were killed in the attack. While Hernandez said she didn't know LePatner personally, her loss is keenly felt.
"Of course we are feeling sadness, we lost a dear colleague, but we are so grateful that we have each other," Hernandez said.
Hernandez said she felt safe Monday, which was a sentiment echoed by others.
"The security is there, but not overwhelming," said businessman Michael Zaoui. "I came early for my meeting because I thought there would be a lot more, but everything went really smoothly."
Blackstone told Eyewitness News in a statement:
"We have been working with Rudin (the building's owners), the NYPD and outside security contractors to further enhance our security measures at 345 Park Avenue and our other offices globally. These measures go beyond the upgrades already made over the last two years."
The owner of the food truck that has sat in the shadow of 345 Park for 16 years said business was slow on Monday.
"I feel a little sad because I don't see a lot of my customers, they are like family, they come every day," said Maribel Macedo, the owner of Eggstravaganza food truck.
Macedo drove her truck away last Monday just about an hour before police say shooter Shane Tamura drove his black Series 3 BMW to the building.
"We had a deranged person who drove across the country with an automatic weapon with one intention, and that was to create death and destruction," said NYC Mayor Eric Adams.
Authorities say he began his deadly rampage around 6:30 p.m. and fired 47 rounds.
LePatner was killed in the lobby, along with security guard Aland Etienne and NYPD Officer Didarul Islam.
Rudin employee Julia Hyman was killed on the 33rd floor where Tamura shot and killed himself.
A person close to Tamura's family says the gunman had for years sought medical help for frequent debilitating headaches. He even received injections in the back of his head.
In a suicide note, Tamura claimed he suffered from CTE from playing football, and requested that his brain be studied.
Meanwhile funeral services for Etienne were just announced. He will be laid to rest on Saturday, August 9 in Canarsie, Brooklyn.
----------
* Get Eyewitness News Delivered
* More Manhattan news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube
Submit a tip or story idea to Eyewitness News
Have a breaking news tip or an idea for a story we should cover? Send it to Eyewitness News using the form below. If attaching a video or photo, terms of use apply.