Developer Related Companies has recently put this penthouse atop Zaha Hadid Architects' 520 West 28th in New York on the market for a cool $50 million. The residence takes over three floors of the 11-story condo, as it is the most expensive condo in the building completed by Zaha Hadid Architects.

The penthouse features floor-to-ceiling windows that offer nearly unobstructed views along Chelsea's elevated High Line park, while the kitchen, an open-plan lounge and dining room, a library, and five bedrooms reside on the first two levels. The third then calls home to an expansive rooftop patio.

Complementing the condo's wooden floors and muted walls is a gorgeous white staircase designed by the late Zaha Hadid.

"Within the penthouse, this centerpiece is manifest as the sculptural staircase that extends all three floors, connecting its interior with the large outdoor terrace," says ZHA project director Johannes Schafelner. "An evolution of the flowing spiral staircases within Zaha Hadid's cultural buildings, this staircase is designed with multiple perspectives that engage perception and draw the eye from the horizontal to vertical – uniting the penthouse's three levels with the fluid design language of the building's facade."

The penthouse also comes with 2,552 square feet of outdoor space, including the aforementioned rooftop patio which is outfitted with an outdoor kitchen, dining area and lounge, and beds for sunbathing.

For more on the $50 million property, head on over to Related Companies.

In other design news, this underground hotel in Shanghai is the world's first.

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