He and wife Hilary Geary Ross had listed the 5,573-square-foot apartment for $21 million in 2015 before lowering it to $18.5 million last year. Located on West 57th Street - a section of New York that's been dubbed "Billionaires' Row" - the duplex penthouse has four bedrooms, five and a half baths, and a terrace with more than 1,800 square feet of space.
Let's take a look inside the billionaire investor's lavish spread.