Flatiron District

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.

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Rendering of One Madison Avenue Expansion. Designed by Kohn Pedersen Fox

One Madison Avenue’s Concrete Core Begins Ascent in Flatiron District, Manhattan

Construction is set to begin on the new floors at One Madison Avenue, a 27-story office tower expansion in Manhattan’s Flatiron District. Designed by Kohn Pedersen Fox for SL Green, the project involves the gut renovation of the existing eight-story building and structural addition above its roof level, bringing the structure up to 1.4 million square feet of Class A office space. The National Pension Service of Korea and Hines are also part of the development team and acquired $1.25 billion in construction financing for the property, which occupies a full block bound by East 23rd and 24th Streets and Madison Avenue and Park Avenue South.

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Rendering of One Madison Avenue Expansion. Designed by Kohn Pedersen Fox

One Madison Avenue’s Vertical Expansion Set to Begin in Flatiron District, Manhattan

A construction crane is now in position and ready for vertical progress on One Madison Avenue, a 27-story office tower expansion in Manhattan’s Flatiron District. Designed by Kohn Pedersen Fox and developed by SL Green, the project involves the gut renovation of an existing eight-story building and structural addition above its roof level, bringing the structure up to 1.4 million square feet of Class A office space. The National Pension Service of Korea and Hines are also part of the development team and recently acquired $1.25 billion in construction financing for the property, which occupies a full block bound by East 23rd and 24th Streets and Madison Avenue and Park Avenue South. The project team is aiming for both WELL and LEED Gold certification.


Rendering of One Madison Avenue Expansion. Designed by Kohn Pedersen Fox

IBM Confirmed as Anchor Tenant for One Madison Avenue in Flatiron District, Manhattan

IBM will consolidate its New York City offices and relocate to One Madison Avenue, a commercial office tower renovation and expansion currently underway in the Flatiron District. Designed by Kohn Pedersen Fox and developed by SL Green Realty Corp, the project involves the construction of a 530,000-square-foot addition atop the original eight-story building, for a total of 1.4 million square feet of Class A office space.

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Flatiron House At 39 West 23rd Street Launches Sales, Nears Completion, In Flatiron District, Manhattan

NYC-based real estate development firm Anbau, together with Corcoran Sunshine Marketing Group, today announced the launch of sales at Flatiron House, a new luxury condominium located at 39 West 23rd Street. With architecture and interiors by COOKFOX Architects, a leader in biophilic design, the development comprises two distinct buildings connected by a shared interior garden with a total of 44 residences. The Tower features 37 one-to four-bedroom residences with a separate entrance on 23rd Street, while the Loft offers a collection of seven one- to five-bedroom residences and an entrance on 24th Street, many of which are full-floors with direct elevator entry.

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