Flatiron District

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.

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

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.

Rendering of One Madison Avenue Expansion

New Photos Reveal Demolition Progress at One Madison Avenue in Manhattan’s Flatiron District

7:30 am on July 15, 2021 By Sebastian Morris

Construction is currently ahead of schedule on One Madison Avenue, a 1.4-million-square-foot, 27-story office tower expansion in Manhattan’s historic Flatiron District. As of today, 100 percent of demolition work is complete and structural reinforcement is underway.

Flatiron Building’s Limestone and Terracotta Façade Renovation Progresses in Flatiron District, Manhattan

8:00 am on March 20, 2021 By Michael Young

Renovation work is continuing to progress on the Flatiron Building, one of Manhattan’s most famous buildings. The Flatiron District project is developed by GFP Real Estate and involves restoration of the commercial building’s limestone and terracotta envelope, the replacement of its window-hung air conditioning units with central heating and cooling, and the installation of a new sprinkler system, a second egress staircase, upgraded elevators, rooftop solar panels, and rain reclamation tanks. Designed by Daniel Burhnam and officially addressed as 175 Fifth Avenue, the 119-year-old steel-framed office building was one of the first skyscrapers to be constructed in the 20th century and rises on a thin triangular parcel wedged between Broadway and Fifth Avenue and West 22nd and West 23rd Streets. YIMBY last reported that the restoration is expected to cost between $60 and $80 million.

Aerial Rendering of proposed alterations and rooftop pavilion at 122 Fifth Avenue - Studios Architecture

Updated Renderings Reveal Renovation Project at 122 Fifth Avenue in Union Square, Manhattan

7:00 am on January 24, 2021 By Sebastian Morris

The Landmarks Preservation Commission (LPC) is reviewing updated proposals to renovate and expand a ten-story commercial building at 122 Fifth Avenue near Union Square, Manhattan. Renderings from Studios Architecture reveal a new rooftop pavilion and extensive updates to the building’s facade at each elevation along Fifth Avenue, 17th Street, and 18th Street.

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