Alloy Block’s 100 Flatbush Avenue Begins Rise in Downtown Brooklyn

Construction is currently ramping up at 100 Flatbush Avenue, a 44-story residential building in the Alloy Block multi-tower complex in downtown Brooklyn. Designed and developed by Alloy Development, the 482-foot-tall structure will produce 441 units, including 45 earmarked for affordable housing. The project was originally supposed to have 100,000 square feet of office space, but that was scrapped in favor of an additional 184 apartments. Urban Atelier Group is the contractor for the property, which is located on a trapezoidal lot bounded by Flatbush Avenue to the northeast, State Street to the southwest, and Third Avenue to the northwest.

At the time of our last update in mid-April, foundation work was progressing while excavation was still underway on portions of the property. Now the reinforced concrete superstructure is two stories above street level, with projecting rebar for the columns in preparation for the formation of subsequent levels.

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

The construction crane has been assembled and dominates the project site. Large metal scaffolding temporarily sits between the first and second floors while the concrete settles.

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

The following two photographs were taken in early June.

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Ave. Photo by Michael Young

100 Flatbush Avenue features a Flatiron-like massing that includes three shallow setbacks on the path to its flat parapet. We could probably see the edifice reach a quarter of its total height by the end of the summer and approach the midpoint by the end of the year. Every step back and every slight reduction in floor space should help speed up the pace of work.

The project is expected to become New York’s first all-electric tower with all functions powered by electricity, including the use of induction cooktops, heat pump dryers, hot water and HVAC. The houses are located from the third to the 41st floor, with the majority of residential equipment being housed in the podium. These include a fitness center, flexible workspace, and outdoor rooftop pool.

The alloy block. As seen on The Alloy Block main site

Alongside 100 Flatbush Avenue and the larger 80 Flatbush Avenue are two elementary schools: the KGIA at 380 Schermerhorn Street with a new cafeteria, gymnasium and library; and an elementary school at 489 State Street with its own community-accessible gymnasium and auditorium.

The second phase of the master plan will be led by Architecture Research Office as design architect, Ismael Leyva Architects as official architect, Silman Associates and Magnussen Klemenic as structural engineers, Cosentini & Associates as MEP Engineer, Front Inc. the Façade Consultant, Nelson Byrd Woltz as the Landscape Architect, Thornton Tomasetti as the Sustainability Consultant, Lighting Workshop as the Lighting Consultant, Langan as the Geotechnical Engineer and AKRF as the as a civil engineer.

Khalil Gibran International Academy high school. As seen on The Alloy Block main site

YIMBY last reported that 100 Flatbush Avenue and the two on-site schools are expected to be completed in the first half of 2024, while 80 Flatbush Avenue is expected to take three years to build and possibly be fully completed by 2027.

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