Construction and steelwork has begun on the fourth tier of JPMorgan Chase‘s 1,388-foot supertall headquarters at 270 Park Avenue in Midtown East. Designed by Lord Norman Foster of Foster + Partners with Adamsom Associates as the architect of record and developed by Tishman Speyer, the 60-story skyscraper will yield 2.5 million square feet of office space with a capacity of 15,000 employees, and will become the tallest structure in New York completely powered by hydroelectric energy. AECOM Tishman is the general contractor for the full-block property, which is bound by East 48th Street to the north, East 47th Street to the south, Park Avenue to the east, and Madison Avenue to the west.

Recent photographs show another handful of floors added to the steel superstructure since our last update in mid-July, when crews were on the precipice of crossing the 984-foot supertall threshold. Now, construction is beginning on the fourth and penultimate tier of the stepped massing. These final two tiers make up the crown, which is shown illuminated at night in the main rendering.

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