One Madison Avenue’s Tower Expansion Tops Out in Flatiron District, Manhattan
Construction has topped out on One Madison Avenue, a 27-story commercial building in the Flatiron District. Designed by Kohn Pedersen Fox and developed by SL Green, the National Pension Service of Korea, and Hines, the project involves the gut renovation and expansion of a former eight-story structure and will yield 1.4 million square feet of office space as well as retail space and a slate of amenities. Banker Steel provided the steelwork, NYC Constructors is assembling the new expansion, and AECOM Tishman is the construction manager for the property, which occupies a full block at the southeast corner of Madison Square Park.