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HomeModern House PlanThe Westly juts over its Higher West Aspect neighbors with a gravity-defying...

The Westly juts over its Higher West Aspect neighbors with a gravity-defying triple cantilever


Actual property in New York Metropolis is a notoriously dear commodity, and builders have lengthy pushed buildings ever upward in a frantic bid to maximise their investments. However zoning legal guidelines place limits on these skyward thrusts, so in response, architects and engineers are compelled to seek out new options that enhance floor-area ratios whereas reaching aesthetic dynamism. Few are as dynamic because the Westly, a gravity-defying new residential improvement on Manhattan’s Higher West Aspect.

The roughly 140,000-square-foot venture is the handiwork of native structure agency ODA, which has accomplished quite a few initiatives throughout town that, of their massing, resemble Jenga constructs ensconced in glass, concrete, or stone. The Westly follows on this vein: The bottom of the tower rises from a 50-foot-wide lot at 251 West 91st Avenue and cantilevers thrice over its northerly neighbor.

an inverted cantilevering tower
Every of the cantilevered flooring plates required between three and 4 weeks of building. (Courtesy ODA)

The constructing broke floor in September 2019 and was anticipated to open its doorways in late 2021. However social distancing necessities enacted in March 2020 threw a spanner within the works. After building crews set the muse, which incorporates rock anchors to stabilize the topsy-turvy construction, building continued at a charge of roughly one flooring per week, till employees hit the eighth flooring, the place the primary cantilever juts 25 toes outward. The 2 successive cantilevers on the eleventh and 14th flooring protrude 40 and 55 toes, respectively.

Not like with peer initiatives that depend on diagrid trusses, ODA, in collaboration with structural engineer WSP, opted for a concrete Vierendeel system. The choice ensured a rectilinear profile, which permits for nonobstructed and standardized window openings. Nonetheless, the incorporation of these bigger spans introduced building challenges that required particular allowing.

A stepped massing diagram of the westly
(Courtesy ODA)

Kris Levine, ODA’s technical director, defined what this entailed: “When the primary cantilever was erected, we needed to acquire an After Hours Work Variance Allow from the NYC Division of Buildings with a purpose to most effectively and safely use the cranes wanted to hoist the metal beams over the constructing and lay the muse. Throughout this time, the development crew had been permitted by town to work for 61 hours straight.”

Every cantilever was constructed atop a brief metal platform that branched off from the tower’s superstructure. The three cantilevered flooring plates required between three and 4 weeks of building apiece. “To be able to safe the construction of the cantilevers, metal cross-bracings had been put in place earlier than the concrete of every flooring was poured,” continued Levine. “These diagonal beams served as non permanent help, and as soon as the concrete kind was set and floating, they had been torched out and the constructing was left with the concrete.”

three section diagrams of soffits
A diagram of soffit cladding on the Westley (Courtesy ODA)

This being the Higher West Aspect, it was essential to the design staff to mix the brand new constructing into its historic context. To that finish, the concrete construction was clad with a limestone-veneered rainscreen suspended from a typical girt system. The panels prolong over 1 foot from the superstructure to the property line in a chevron-like sample at each spandrel and beam to evoke close by masonry massing. The rainscreen is backed by 3 inches of wool mineral insulation and a 6-inch stud wall with closed cell spray foam insulation.

The Westly is predicted to open later this spring.



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