The current owners of the apartment where alleged sex torturer Howard Rubin built his fetish “dungeon” told The Post they were shocked to find out who it used to belong to.

The home at the top of the Metropolitan Tower Condominium on 57th Street right by Central Park is prime real estate, and had been rented by Rubin for $18,000-a-month. After civil cases against the married ex-financer were filed, he moved out and it didn’t stay empty for long.

“It’s pretty creepy [to realize]. I feel sorry for the women,” said Mary “Rishy” Studer, who bought the luxury two-bedroom with her husband, Quint Studer, in 2019.

In fact, the Studers only realized the $5.4 million apartment’s dark past when approached by The Post.

“I’m learning more every minute,” Quint said. “I’ve learned more in the las

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