A short walk from the home where long-time Wall Street financier Howard Rubin lived with his wife and three children in Manhattan, he kept a second apartment.

The $18,000 a month penthouse at Metropolitan Tower Condominium on 57 th street, just below Central Park, has excellent views — but most of his visitors never got to see them.

According to prosecutors Rubin converted the place into a seedy “built-in” sex dungeon where he allegedly tortured dozens of women with savage beatings, rape and even electrocutions. 10

Rubin and his assistant Jennifer Powers now stand accused of running a $1 million bondage and masochism sex-trafficking scheme between 2009 and 2019, with much of the activity taking place in the sound-proofed apartment.

The Post this week reported how Rubin – worth

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