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Old Posted Apr 23, 2024, 4:16 AM
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One important analysis considered the impact One Vanderbilt would have on sky exposure, which is the percentage of sky visible at a given point and is a measurement of ambient daylight access. We quantified ambient daylight and compared the results against the buildings that One Vanderbilt would replace. While the tower has more than twice the floor area of existing buildings, its negative impact on sky exposure was comparable, being even slightly better, given the tapering of the design.

Concurrent to the design of One Vanderbilt, the New York City Department of City Planning was revising zoning regulations, which included increasing the allowable density, or Floor Area Ratio (FAR), for portions of East Midtown. Existing regulations to control the bulk of a building were originally design to accommodate a maximum of 15 FAR, whereas the proposed zoning changes would increase FAR to as much as 24 for certain sites.

KPFui assisted the city in studying the rezoning issue, developing digital versions of bulk regulations for Midtown and testing thousands of massing options under the proposed 24 FAR density. It was determined that commercially viable 24 FAR office buildings that complied with current bulk regulations were impossible, necessitating the revision of zoning regulations. KPFui worked with the city to develop and test a series of revisions to bulk regulations that would achieve the desired density while minimizing negative impacts.













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