Flatiron District

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

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

8:00 am on March 24, 2022 By Michael Young

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

7:30 am on March 23, 2022 By Sebastian Morris

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

8:00 am on February 2, 2022 By Michael Young

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

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

8:00 am on October 25, 2021 By Michael Young

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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