The Alloy Block

1,500-unit Downtown Brooklyn complex to enter public review next month

Renderings courtesy of Alloy Development

June 29, 2026

1,500-unit Downtown Brooklyn complex to enter public review next month

A proposed four-building development in Downtown Brooklyn with roughly 1,500 apartments is set to enter public review next month. The Department of City Planning (DCP) on Friday issued a 30-day certification notice for 240 Nassau Street, a mixed-use development near the Brooklyn Navy Yard with 1,500 homes, a new K–8 public school, a community center, a cultural center, retail space, and public open space. The development team, consisting of NYC Educational Construction Fund (ECF), Alloy Development, and GFB Development, is looking to rezone the site to allow for the 1.4 million-square-foot mixed-use development. The uniform land use review procedure (ULURP) will begin in July, with construction anticipated to start in 2027.
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World’s tallest Passive House building in Brooklyn secures $535M in financing

All renderings courtesy of Alloy Development

August 27, 2025

World’s tallest Passive House building in Brooklyn secures $535M in financing

By Aaron Ginsburg

The future tallest Passive House building in the world is moving ahead in Downtown Brooklyn. Alloy Development and the Vistria Group on Tuesday announced the closing of $535 million in capital for the construction of One Third Avenue, a 730-foot mixed-use project with 583 apartments, retail, and office space. The tower is the final piece of the Alloy Block, a five-building complex that includes more than 1,000 homes, the city’s first all-electric skyscraper, and two Passive House public schools.
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NYC’s first Passive House public schools open in Downtown Brooklyn

Credit: James Ewing / JBSA

November 21, 2024

NYC’s first Passive House public schools open in Downtown Brooklyn

By Aaron Ginsburg

New York City's first Passive House-certified public schools have opened in Downtown Brooklyn, setting the bar for sustainable education. Designed by Architecture Research Office (ARO), the ultra-low-energy-use building houses two schools: the Khalil Gibran International Academy, the nation’s first English-Arabic public high school, and the Elizabeth Jennings School for Bold Explorers (aka P.S. 456). Part of the mixed-use development Alloy Block, the facility consumes less than a third of the energy of a typical NYC public school.
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Architecture And Design

Leasing begins at Brooklyn’s all-electric skyscraper 505 State Street, from $3,475/month

Photo: Matthew Williams

January 23, 2024

Leasing begins at Brooklyn’s all-electric skyscraper 505 State Street, from $3,475/month

By Aaron Ginsburg

Leasing officially launched on Monday at New York City's first all-electric skyscraper. Developed by Alloy Development, 505 State Street (formerly called 100 Flatbush) is a 44-story tower with 441 apartments in Downtown Brooklyn. The building, which replaces all functions that would normally run on gas with electricity, is part of Alloy Block, a mixed-use development of five old and new buildings that will bring residential, office, retail, and the city's first two Passive House-certified public schools to the neighborhood. Available rentals at the building start at $3,475/month for a studio and go up to $11,200/month for a three-bedroom.
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New Developments

Live in NYC’s first all-electric skyscraper in Downtown Brooklyn, from $763/month

Photos courtesy of Pavel Bendov Photos

October 10, 2023

Live in NYC’s first all-electric skyscraper in Downtown Brooklyn, from $763/month

By Aaron Ginsburg

New York City's first all-electric skyscraper launched a housing lottery on Tuesday for 45 mixed-income apartments. The 44-story residential tower in Downtown Brooklyn, previously 100 Flatbush Avenue and now called 505 State Street, will run totally off electricity instead of natural gas and apartments will have sustainable features. New Yorkers earning 40, 60, and 100 percent of the area median income can apply for the apartments, which include studios ranging from $763 to $2,017/month, one-bedrooms from $812 to $2,155/month, two-bedrooms from $965 to $1,502/month, and three-bedrooms from $1,105 to 1,725/month.
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Affordable Housing

NYC’s first all-electric skyscraper tops out in Downtown Brooklyn

Image courtesy of Selvon Ramsawak

January 18, 2023

NYC’s first all-electric skyscraper tops out in Downtown Brooklyn

By Aaron Ginsburg

New York City's first fully electric skyscraper topped out in Downtown Brooklyn this week. The 44-story building 100 Flatbush is part of the first phase of Alloy Block, a mixed-use five-building development designed by Alloy Development to have 850 apartments, 200,000 square feet of office space, and two public schools. 100 Flatbush will contain 441 mixed-income residences, 396 of which will be market-rate rentals and 45 separate affordable residences, and 30,000 square feet of retail space.
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Construction set to begin on five-building Alloy Block development in Downtown Brooklyn

Renderings courtesy of Alloy

July 19, 2021

Construction set to begin on five-building Alloy Block development in Downtown Brooklyn

By Devin Gannon

After securing $240 million in financing, Alloy Development announced construction will kick off this month on its huge mixed-use, multi-building project in Downtown Brooklyn. Formerly known as 80 Flatbush, Alloy Block includes five buildings with 850 apartments, 200,000 square feet of office space, 40,000 square feet of retail, and two public schools designed to meet Passive House standards. Since first announcing the project roughly four years ago, developers have cut the height of the residential towers, swapped out planned office space for additional residences, and pushed back the expected completion date.
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