Flatiron District

One Madison Avenue’s New Glass Curtain Wall Begins Installation in Flatiron District, Manhattan

8:00 am on February 13, 2023 By Michael Young

The new glass curtain wall has begun installation 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 of an eight-story structure and the construction of a new steel-framed addition above its parapet, and will yield 1.4 million square feet of office space and ground-floor retail. NYC Constructors is building the expansion and AECOM Tishman is the construction manager for the property, which occupies a full block at the southeast corner of Madison Square Park between Madison Avenue, Park Avenue South, East 23rd and 24th Streets.

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

SL Green Announces Two Culinary Destinations at One Madison Avenue in Flatiron District, Manhattan

7:30 am on December 21, 2022 By Sebastian Morris

Developer SL Green has again partnered with Michelin-starred chef Daniel Bolud on a dining concept in Manhattan. This time, the venture will launch a European-style marketplace and a steakhouse at One Madison Avenue, a new Class A office building currently under construction in Manhattan’s Flatiron District.

One Madison Avenue’s Tower Expansion Tops Out in Flatiron District, Manhattan

7:30 am on December 19, 2022 By Michael Young

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.

One Madison Avenue’s Tower Expansion Begins Steel Assembly in Flatiron District, Manhattan

8:00 am on September 20, 2022 By Michael Young

Construction is rising on One Madison Avenue, a 27-story commercial expansion 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. AECOM Tishman is the general contractor for the property, which occupies a full block bound by East 23rd and 24th Streets and Madison Avenue and Park Avenue South.

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

8:00 am on June 11, 2022 By Michael Young

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.

YIMBY Scopes Views From Flatiron House at 39 West 23rd Street in Flatiron District, Manhattan

7:30 am on June 9, 2022 By Michael Young

YIMBY went on a tour of Flatiron House, a two-tower residential development at 39 West 23rd Street in the Flatiron District. Designed by COOKFOX Architects for NYC-based real estate development firm Anbau Enterprises, the structure will yield 44 condominium units with sales and marketing led by Corcoran Sunshine Marketing Group. The taller portion of Flatiron House is called the Tower and features 37 one- to four-bedroom homes with an entrance on West 23rd Street, while the shorter annex is dubbed the Loft and comes with seven one- to five-bedroom residences and its own entrance to the north on 24th Street. Ryder Construction is the general contractor for the property, which is located between Fifth and Sixth Avenues.

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.

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.

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.

YIMBY Ad Partner

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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