DETAILS

270 Park Avenue is one of the most significant construction projects in recent New York history, a 60-story tower designed by Foster + Partners, standing above Grand Central Terminal and serving as the global headquarters of JPMorgan Chase. Opened in late 2025 at an estimated cost of $3 billion, the building's structural logic pushed its load-bearing system to just a handful of fan columns at grade, freeing the base to deliver 52,000 square feet of public plaza, more than twice the footprint of the previous building on the site.

Across approximately 52,000 square feet of exterior ground plane, multiple feature types include paving, site walls, stairs, curbs, fan column cladding, benches, and storefront. All these elements were fabricated from Giallo Ornamental, a species of granite quarried and milled in Carrara, Italy then shipped to New York for installation. The full count totaled over 14,000 individual parts, nearly 3,000 of them unique.

Galbraith Design Studio joined the project as project lead, project manager, and computational designer mid-delivery, inheriting a scope that required both technical remediation and forward momentum. Errors and omissions in the existing work were identified and resolved. Much of the of the project geometry was reworked and recoordinated before fabrication documents could proceed. GDS was responsible for ensuring that every deliverable, fabrication model, shop drawings, fabrication tickets, set-out drawings, and general coordination documentation, was technically accurate, fully vetted, and delivered on schedule to the stone setter, Berardi Stone Setting, and site contractor, John Civetta & Sons.

An additional scope item emerged during delivery that fell outside the original brief but proved critical to the project's success. Working backward from the completed stone model, the surface geometry was used to derive a concrete substrate model at the correct finished elevations, producing spot coordinate drawings with elevations that Civetta could use directly to set the concrete subbase. The parametric model that had been built for fabrication made this possible quickly and precisely, in a way that would have been prohibitively labor-intensive by conventional means.

Managing the delivery required coordinating an international digital team including Paul Wintour of Parametric Monkey in Australia, who developed and maintained the parametric geometry and fabrication automation workflows in Rhino 8 and Grasshopper, and a production team at Slantis in Uruguay, who handled the manual drawing refinement and documentation output that automation alone couldn't fully resolve. Across time zones and disciplines, GDS held accountability for what left the studio.

The geometry across each feature type presented its own set of challenges. Pavers that read as straightforward in plan required careful classification and individual resolution depending on grade changes, tolerance requirements, and design intent, some needed full 3D documentation and CNC fabrication from a single piece of stone. Site walls, stairs, curbs, and fan column cladding each carried unique geometric conditions that compounded the part count and documentation burden considerably. Custom Python scripting supplemented the Grasshopper workflows where needed. Project data, part numbers, revision tracking, submittal status, was all managed through a custom built cloud database that linked part lists to the fabrication schedule and team coordination.

The result is a plaza whose apparent simplicity is a product of geometric precision held at manufacturing tolerances, the kind of outcome that only becomes possible when the gap between design intent and fabrication reality is closed before a single piece of stone is cut.