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Bettesworth Construction
BIG

How BIG’s Spiral Tower Brings Green Terraces into the New York Skyline

The Spiral is BIG’s completed 66-story New York office tower, with planted terraces that step upward around the building and extend the High Line’s greenery toward the skyline.

By Bettesworth Construction Team 2 min read
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BIG’s stepped skyscraper is The Spiral, a completed 66-story office tower at West 34th Street and 10th Avenue in New York City. Its terraces climb around the building in a continuous sequence of planted outdoor spaces, extending the nearby High Line’s greenery toward the skyline. The architect reports a height of 1,031.5 feet and 2.8 million square feet of area.

Why The Spiral has a stepped form

The Spiral’s outline is not simply a sculptural gesture: BIG says the massing follows the site’s zoning envelope. A series of setbacks creates terraces that wrap around the tower, giving office floors access to outdoor space. The result combines the broad, stepped profile of a ziggurat with the slender proportions and floor layouts of a modern high-rise, as BIG describes it.

The design draws on the High Line, the elevated park near the tower. BIG frames the terraces as a green ribbon that continues upward from the linear park. Rather than placing greenery only at ground level, the scheme carries planted spaces around the building’s exterior and links them to office floors.

How the terraces and planting are designed

BIG describes accessible terraces at office floors, as well as double-height amenity spaces on selected levels and options to connect adjacent floors. These features are intended to bring outdoor access and visual connections into the workplace; the project description does not establish how tenants use them in practice.

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The landscape strategy varies planting with elevation and exposure. BIG describes ground cover, shrubs and taller bushes lower down, followed by trees and climbing ivy at higher levels. The architect says the planting palette responds to daylight, wind and temperature conditions at different floors and orientations.

BIG reports approximately 13,000 square feet of outdoor space and says a landscape of this size had not previously been installed at or above 300 feet in New York City. Those figures and the comparison are the architect’s claims; the project page does not give a publication year for them. It also describes collecting and redistributing rainwater for irrigation, but provides no operating data establishing water savings.

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Project scale and construction team

Project detail Reported information
Height 1,031.5 feet, according to BIG; no publication year is stated on its project page.
Stories 66, according to BIG; no publication year is stated on its project page.
Area 2.8 million square feet (260,129 square metres), according to BIG; no publication year is stated on its project page.
Status and certification BIG lists the project as completed and reports LEED Gold certification. Its project page does not state a certification date or provide performance measurements.
Development and construction Developed by Tishman Speyer and built by Turner, according to BIG.
Design and engineering collaborators Adamson Associates is listed as a design collaborator; WSP Cantor Seinuk is listed as structural engineer by BIG.
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What the green design claims do—and do not—show

The terraces, planting plan and rainwater system describe design features and intentions, not independently measured environmental or workplace outcomes. BIG’s project page reports LEED Gold, but does not provide a certification date, post-occupancy findings, water-use results or evidence of changes in biodiversity. The architect’s descriptions establish what the building was designed to provide; they do not by themselves show how those features perform over time.

For the project’s dimensions, design description and team, see BIG’s project page for The Spiral.

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