Access restricted at ‘highly secured’ NYC building following Monday’s deadly shooting spree

Barriers were erected in front of the ritzy Midtown Manhattan office building where a crazed gunman killed four people Monday, with access being restricted even to some who work there.

“I’m a contractor, I work in the building. My tools are in there, I came today to get them, they told me it’s an active crime scene. I can’t go,” a worker who was turned away at the entrance told The Post Tuesday.

Even before the horrific rampage, the 44-story skyscraper was “highly secured” and featured a multi-step process both for entry and elevator access, according to a former NFL player.

“It is a massive building, one of the most highly secured that I’ve ever been in,” CNN sports anchor and ex-NFL player Coy Wire told the outlet, describing the lengthy check-in process required for entry and locked security gates restricting access to the elevators.

But Shane Tamura, 27, of Las Vegas, somehow gained entry to 345 Park Ave. — which houses Blackstone, NFL Headquarters, Rudin Management and other businesses — armed with an AR-style assault rifle.

Wire said friends who work in the building were “scared” and “shocked” even before they knew an NFL employee had been shot.

Tamura began his massacre in the lobby of the 44-story building, shooting and killing police officer Didarul Islam, 36, as well as married mom and Blackstone executive Wesley LePatner, who was hiding behind a pillar.

He unleashed a barrage of bullets on his way to the elevators, killing a security guard who was crouching at his desk.

Tamura then rode an elevator to the 33rd floor and opened fire as he stalked the office, killing Julia Hyman of Rudin Management before turning the gun on himself.

Bystanders near the building described hearing shots emanating from the skyscraper lobby, and spotting Tamura toting a “big ass gun” as they swiftly walked out of the gunman’s path.

“I heard a gunshot. I wasn’t really looking at his face, but I saw the gun. He was holding it like this,” AB, 17, who works at Taste of Delicatessen on Lexington Ave., told The Post, standing with his feet apart while mimicking holding a long gun.

“It was a big ass gun. I didn’t want to be in the danger zone so I walked out of the way and left it alone,” he said, describing people running for their lives amid the chaotic scene.

“It was crazy.”

He said he wasn’t nervous because he lives in Red Hook and has heard gunshots there — but not in Midtown in broad daylight.

“God was with me, so if he told me to walk out of the way, I did it. It is what it is.”

Jason Matza, 35, a stock trader, said he lives in the area and passes 345 Park Ave. on a regular basis on his way to and from work.

“I was gonna walk by here last night before I heard about the shooting. I could have been right here,” he told The Post.

Matza’s father was in town to see his new apartment when he got an alert on the Citizen app about the shooting in progress.

“I was like holy s–t. You got Grand Central literally down the street so he could’ve had access to any form of transportation. It could’ve been an uncontained situation,” he said.

“I’m glad it wasn’t a terrorist attack.”

Griffin Harblin, 22, an intern at a building across the street from the scene of the massacre, said it was “a bit scary” but praised the NYPD, which he said did “a good job” handling the incident.

“Obviously I feel for the families and the people affected by this, but obviously it could have been a lot worse. So yeah, I’m feeling very thankful on this Tuesday morning.”