One Madison

One Madison Avenue’s Renovation and Expansion Progresses in The Flatiron District, Manhattan

Work continues to progress on One Madison Avenue, a 1.4-million-square-foot, 27-story office tower expansion in Midtown, Manhattan’s Flatiron District. Designed by Kohn Pedersen Fox and developed by SL Green, the project involves the construction of a steel-framed structure atop the current eight-story building, which was partially demolished and is in the process of being excavated and gutted. The property takes up a full block bound by East 23rd and 24th Streets and Madison Avenue and Park Avenue South, and sits directly adjacent to the 112-year-old Metropolitan Life Insurance Company Tower. The developers, which also include the National Pension Service of Korea and Hines, successfully acquired $1.25 billion in construction financing and are aiming to achieve both WELL and LEED Gold certification, as well as incorporating state-of-the-art HVAC and circulation systems to improve interior air quality and overall cleanliness. AECOM Tishman is serving as the general contractor.

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One Madison Avenue’s Renovation and Expansion Project Ramps Up in the Flatiron District, Manhattan

Construction activity is underway at One Madison Avenue in the Flatiron District, where the 13-story full-block structure is being renovated and expanded with a new 18-story addition. Designed by Kohn Pedersen Fox and developed by SL Green, the project will stand 27 stories and yield 1.4 million square feet of Class A office space. Helping to develop and finance One Madison Avenue’s future are the National Pension Service of Korea and Hines, contributing a grand total of $1.25 billion in construction financing. The property is bound by East 23rd Street to the south, Madison Avenue and Madison Square Park to the west, East 24th Street to the north, and Park Avenue South to the east.

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