Related Companies have released photos of the 6856′ SqFt penthouse atop 520 West 28th, both designed by our friends at Zaha Hadid Architects; the property features notably a sculptural white staircase and expansive rooftop terrace with views of the High Line. It occupies the top three floors of ZHA’s 11-storey luxury condo and it, the unit, is listed for $50M, making it the most expensive of the 39 condos in the building which was completed earlier this year. The interiors boast floor-to-ceiling windows with expansive views of the High Line park next to which the building stands; there is an open-plan lounge and dining room, as well as a library and five bedrooms spread out across the first two levels. The third is slightly smaller and gives onto the rooftop patio. The palette for the interiors is minimal, offering relief for the centerpiece, a curving white staircase designed by the late Zaha Hadid, who herself led this project.