A four-level "quadplex" penthouse located in the skinniest skyscraper on Manhattan 's Billionaires Row just hit the market ...

The mansion-size quadplex penthouse on the 80th through 83rd floors has multiple terraces and views across the city ...

The four-story “quadplex” of Steinway Tower overlooks Central Park and offers 360-degree views of New York City.

or “quadplex,” spans floors 80 to 83 of the 1,428-foot-tall building 111 W 57th Street and overlooks Central Park. With interiors designed by Studio Sofield, the suggested floor plans features ...

A newly listed penthouse along Manhattan’s Billionaires’ Row made a grand entrance to the local residential market on Thursday.

A luxury penthouse atop the fourth-tallest residential building in the US, located in Manhattan, is now on the market for ...