Construction has topped out on 100 Flatbush Avenue, a 44-story residential tower at Alloy Block in Downtown Brooklyn. Designed and developed by Alloy Development, the 482-foot-tall structure will be powered entirely by electricity and will yield 441 units with 396 at market rate and 45 dedicated to affordable housing, the latter of which are being developed with Fifth Avenue Committee. The full five-building Alloy Block masterplan will encompass 850 units with 200 permanently affordable apartments, 100,000 square feet of Class A office space, 50,000 square feet of retail space, 500 parking spaces for bikes, two Passive House public schools designed by Architecture Research Office, and space for a local cultural institution. Urban Atelier Group is the general contractor for the property, which is bound by Flatbush Avenue to the northeast, Third Avenue to the northwest, and State Street to the southwest.
The reinforced concrete superstructure was roughly three-quarters complete at the time of our last update in early December. Since then, crews have reached the flat parapet and the glass and metal curtain wall has continued to follow quickly behind. Only the final few floors above the last setback remain to be enclosed, along with the gap on the northeastern elevation where the construction elevator is attached. Cladding Concepts is supplying the GFRC façade and rainscreen attchment system
“The Alloy Block is a transformative vision for Downtown Brooklyn and will set a new standard for sustainable development for New York,” said Alloy CEO Jared Della Valle. “As the city’s first fully electrified skyscraper, 100 Flatbush not only serves as a model for sustainable urban development but it also delivers for the community by providing much-needed housing, along with retail along Flatbush Avenue. We thank our construction team for its hard work toward reaching this exciting milestone.”
Additional progress has also been made on the two grade schools on the northern side of the property. Recent photos show the dark gray brick façade taking shape on the northern face of the Khalil Gibran International Academy High School (KGIA), the city’s first Arabic language-focused high school. The rest of the masonry walls should be completed over the next several months.
The following photo looking south from Flatbush Avenue Extension shows a central mechanical bulkhead subtly protruding above the flat roofline of the northern elevation.
Below is a street-level rendering of the entrance to the Khallil Gibran International Academy High School (KGIA) at 380 Schermerhorn Street, which will have a cafeteria, a gymnasium, and a library. The adjacent elementary school at 489 State Street will feature a separate gymnasium and an auditorium accessible to the community. Both are the city’s first two public schools designed to meet Passive House standards.
100 Flatbush Avenue’s units will feature induction cooktops, heat pump dryers, and base-building systems like hot water heating and HVACs designed to make the structure carbon neutral. Alloy also recently issued a Request for Proposals that seeks to partner with a community solar developer to enroll 100 Flatbush Avenue in projects that will secure a 100-percent local renewable energy supply for the building. The developer is the first to pursue such a program following a recent rule issuance by the New York City Department of Buildings around compliance with Local Law 97, which enabled developers to comply through off-site solar programs.
Homes will occupy the third through 41st floors of 100 Flatbush Avenue. Most of the amenities are housed within the multi-story podium and include a fitness center, flexible workspaces, and an outdoor rooftop swimming pool. The retail space at Alloy Block will have 20-foot ceiling spans that face Flatbush Avenue Extension.
100 Flatbush Avenue and the two schools are on track to be completed in the first half of 2024. The second tower at 80 Flatbush Avenue has an estimated completion date of 2027, but has yet to begin construction.