Neighbors of the New York City architect arrested in connection with the grisly “Gilgo Four” murders say the Long Island resident seemed “regular” — though others recalled long being spooked by his dilapidated house and said they were “not surprised” that he was arrested for the killings.

“I’ve seen him. He looks regular, like an everyday guy. I’ve seen him when I take my wife to the train — he takes the train to his office in the city,” Barry Auslander, 72, told The Post of Rex Heuermann, 59, a Massapequa Park resident who was taken into custody Thursday night at his office in Manhattan.

“He seemed like a regular neighbor,” Auslander, who lives down the block from the home on 1st Avenue, insisted early Friday.

“He grew up here. I never thought he was anything but a businessman. Average guy who had a family and went to work.”

Shortly before 9:30 a.m., at least eight investigators dressed in forensic gear were still milling around Heuermann’s house on the quiet suburban street.

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Heuermann — who is married with two children — worked as an architect at his eponymous firm in Manhattan.

“He’s an architect but has real estate interests. And the first review I saw said, ‘If you’re going to hire him, be very careful, it’s a genuine risk,’” Auslander said.

Another neighbor, who asked not to be named, was still trying to process the news of Heuermann’s arrest.

“You don’t expect something like this to happen in a town like Massapequa. This is as suburban as it gets,” he told The Post.

“It’s a little scary. It can be anywhere. It could be your neighbor and you would never know,” agreed Cheryl Lombardi, who has lived down the street from Heuermann’s address since 1989.

Who is Gilgo Beach serial killer suspect Rex Heuermann?

A suspected serial killer has been arrested over the notorious Gilgo Beach murders in Long Island, The Post can confirm.

Rex Heuermann, 59, a married dad of two and architect at a New York City firm, has a home on 1st Avenue in Massapequa Park, sources told The Post.

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His arrest is tied to the “Gilgo Four,” four women — Melissa Barthelemy, 24, Megan Waterman, 22, Amber Lynn Costello, 27, and Maureen Brainard-Barnes, 25 — found wrapped in burlap within days of each other in 2010. 

The body of Barthelemy was first found along Ocean Parkway on Dec. 11, 2010, sparking fears of a serial killer in the area.

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By spring 2011, the number of bodies had climbed to 10, including eight women as well as an unidentified man and toddler.

Heuermann’s arrest comes after Suffolk County’s new police commissioner created a special Gilgo Beach Homicide Investigation Task Force in February 2022.

“I never seen anyone come out that house. My daughter called me and told me to come out here and see what was going on,” she said, referring to Heuermann’s disheveled, red-painted home.

“We’ve walked past it for years and I always ask myself when is someone going to fix up that house.”

One woman, who said she has been in the neighborhood for 34 years, did not want to share her name but admitted that she was shaken by Heuermann’s possible connection to the infamous killings.

“We could’ve been in the grocery with him and just never know. I’m getting chills,” she said.

“My husband has seen him before sitting on his step. It’s a quiet neighborhood so it’s just surprising. 

“All the victims’ families are living through it again. That’s who I feel bad for,” she continued.

“It kind of makes sense — hotshot city guy. He has money. I’m not surprised.”