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

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

The apartment atop 111 West 57th Street on Billionaire's Row occupies the 80th to 83rd floors of what's been dubbed the ...

Arranged over four floors, the pad "quadplex" is designed to make the most of the unrivalled views of New York City. The property boasts two terraces and a multitude of floor-to-ceiling windows ...

The penthouse consists of a four-floor home or a "quadplex" spanning the 80 to 83 floors of the 1,400-foot-tall building. The luxury quadplex spans floors 80 to 83 of Steinway Tower in Manhattan.( ...

Spanning 11,480 square feet across the 80th to 83rd floors, the quadplex residence offers sweeping ... building's residences occupies at least a full floor, but Penthouse 80 takes up four entire ...

A partnership between The Roxborough Group and Camden Pacific Partners LCC invested in The Union Flats in Union City, Calif.

A quadplex penthouse in Manhattan's Steinway Tower, the world's skinniest skyscraper is on sale for $110 million.

Quadplex' Penthouse on New York's Billionaire's Row Lists for $110 Million—and Tops List of Most Expensive Homes ...