A helicopter crash-landed atop a Midtown Manhattan office building Monday afternoon, officials told The Post.

At least one man was killed, the NYPD said, and staffers from the city Medical Examiner’s Office were seen entering the building.

The victim’s body remains inside the mangled wreckage of the chopper, which burst into flames but was quickly extinguished by firefighters, FDNY sources said.

The victim appears to be the pilot, NYPD sources said, and the FAA said preliminary information indicated that “only the pilot was aboard.”

There are no signs of terrorism and the crash is believed to be an accident, a senior NYPD official said.

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The incident at 787 Seventh Ave. occurred around 1:45 p.m. during heavy rain and fog.

There is no landing pad on top of the building, officials said, and it was unclear why the pilot tried to land there.

The chopper is an Agusta 109E that was not being handled by air traffic controllers, the FAA said.

The Agusta 109E is a two-engine model that can carry two crew members and as many as seven passengers, according to the online GlobalAir aviation marketplace.

President Trump tweeted that he’d been briefed on the crash.

“Phenomenal job by our GREAT First Responders who are currently on the scene. THANK YOU for all you do 24/7/365! The Trump Administration stands ready should you need anything at all,” he wrote.

The 54-floor skyscraper, known as the AXA Equitable Center, is home to Le Bernardin, the acclaimed French seafood restaurant.

Zach Escalante, a computer programmer who works on the third floor, said, “We felt the building move.”

“It felt like something hit or impacted the building,” he said.