Construction has reached the first office levels of JP Morgan Chase‘s new 1,388-foot supertall headquarters at 270 Park Avenue in Midtown East. Steel assembly on the gargantuan ground floor has reached the eastern end of the rectangular parcel, while the rest of the flaring diagonal columns complete the outline of the base. This week, workers began to weld the first set of vertical columns and diagonal beams above the ground floor, which will become trading floors in the first tier of floor plates in the 2.5-million-square-foot behemoth. Tishman Construction is the general contractor for the project, located between Park and Madison Avenues and 47th and 48th Streets.
Photos looking west from Park Avenue reveal the latest assembly of steel, marking the next big step in the construction of the superstructure. This first set of office levels will encompass the largest floor plates in the entire building, above which the massing will feature a series of relatively shallow setbacks on the eastern and western sides, and ultimately, a staggered crown.
The first portion of the steel diagrid pattern has begun formation, as seen in the following photos. These diagonal components will continue outward to the edges of the tower, then return to the center, forming a diamond pattern that will be repeated four times on both the eastern and western elevations.
Since our last update in August, the deep trapezoidal trusses that run parallel from east to west down the center of 270 Park Avenue now span the full block between Park and Madison Avenues. This assembly and the multiple multi-story columns had to be erected first before any work on the office floors above could commence. Metal decking can be spotted being laid down across the start of the first office trading floor.
Crews have created many temporary platforms around the connective joints for welding.
A cascade of sparks comes out as a welder works below the elevated second floor.
A teaser rendering spotted on site depicts a view of the ground floor looking south along the sidewalks lining Park Avenue. Here we see a dense array of trees, seating, and a bronze-colored canopy covering an entrance flanked by two giant vertical walls of dark marble. The outward sloping geometry of the steel-framed structure is subtly shown behind the foliage and appears to be enclosed in an earth-toned paneling system.
No completion date or set of official renderings have been disclosed for the project.