A developer is trying to boot an elderly concentration-camp survivor from his rent-stabilized Manhattan pad by claiming that the man really still lives in Romania — in the small shack seized from his family in the 1940s.

But tenant Lucien Orasel Tomberg, 73, says he hasn’t set foot in his family’s home since Romania’s Communist government took it over in 1948 and sent him, his three brothers and parents to a concentration camp.

Tomberg was the only one who survived.

“It is no small irony that the landlord has seized on the Banul Manta property as a basis for attempting to evict me from my apartment,” Tomberg says in Manhattan Supreme Court papers.

“It is vaguely reminiscent of a very dark episode in human history, of which I and my family were most unfortunate victims.”

At stake is Tomberg’s sprawling two-bedroom apartment at 1200 Fifth Ave., which its owner wants to convert to a million-dollar condo.

The longtime tenant pays $800 a month for the pad, which comes with views of Central Park; a similar unit is on the market for $1.7 million.

The Chetrit Group — the real-estate empire involved in the $1.3 billion sale of Chicago’s Willis Tower — owns the pre-war building through a subsidiary, 1200 Fifth Associates LLC, city property records show. The company began converting the apartments to condos in 2007.

The landlord claims that Tomberg should be kicked out because the cheap pad is not “his primary residence.”

The suit says Tomberg really lives at Banul Manta NR 79 Sector 1 in Bucharest.

But Tomberg said he was just 4 years old in 1948 when the Romanian government confiscated all his family’s property, including the shanty, because they were Jewish. A year later, Tomberg and his family were sent to a concentration camp.

After being orphaned, Tomberg was adopted by a New York couple. They moved into 1200 Fifth Avenue in 1984. Tomberg has lived there ever since, his lawyer, Andrew Borsen, told The Post.

“This is my home. I have never been back to Romania,” Tomberg said.

Tomberg said that about five years ago, developer Michael Chetrit wanted to lower the ceiling in his kitchen to accommodate piping for the renovation of an upstairs unit. Tomberg refused to allow the changes.

“Mr. Chetrit promised he would not forget and would get even with me,” Tomberg says in court papers.

But the landlord’s lawyer, Lawrence Wolf, told The Post, “I don’t think [Tomberg] lives there,’’ adding that building staff said they only see him a few times a year.

The lawyer said the Chetrit Group no longer owns the building, anyway, and that it was a sold to an outside investor. But a property transfer is not recorded in city property records, and a rep for Chetrit said she was looking into the matter but never responded.