Khalil Gibran International Academy and PS 456

This new 146,000 SF ultra-low energy use building designed to the rigorous Passive House standards will be a first for a NYC public school.

Photograph of the new public high school at 100 Flatbush under construction, showing street and traffic in the foreground
The high school faces the more active Flatbush Avenue intersection.

The building houses PS 456, a New York City public primary school, and Khalil Gibran International Academy, an Arabic language public high school. The Flatbush project is a part of Alloy Development’s The Alloy Block, a mixed-use development in Downtown Brooklyn. This community-oriented project includes units of mixed-income housing, office space, retail space, and a new cultural facility in a preserved historic structure.

rendering of kids approaching primary school entrance
State Street facade of the new primary school.

The smaller scale new primary school, PS 456, opens onto a brownstone-lined street while the Khalil Gibran International Academy’s larger scale is situated on Flatbush Avenue, a major thoroughfare with large scale commercial, cultural and residential development. It is located near Atlantic Terminal, the Brooklyn Cultural District, and Barclays Center.

flexible gymnatorium in use for a lecture
The gymnatorium double functions as both a gym and gathering space.

The existing high school will have a new and expanded state-of-the-art home and increased school capacity for students. It will share facilities – such as a new cafeteria, gymnasium, and library – with the new public primary school.

Passive House strategies at 100 Flatbush
Passive House strategies for the school building.

Learn more about the development here.

Watch the team present the project at Building Energy Exchange Archtober 2019:




Photograph of Dominic Griffin against a gray backdrop
Watch – Dominic Griffin Presents Flatbush Ave Primary and High School at 2023 Passive House Network Conference
Rendering of the entry to the primary school at 100 Flatbush
7/19 ARO and Alloy Join the Urban Design Forum for a Tour of the Alloy Block
Photograph of new public school building under construction in Downtown Brooklyn
Khalil Gibran International Academy and PS 456 in The New York Times
Rendering of the primary school entrance at 100 Flatbush
100 Flatbush in Bloomberg Citylab
Photo of two toddlers playing on a slide
Barnard College CSCD, 100 Flatbush Public Schools, and Launch School in Oculus
Rendering of the entrance to 100 Flatbush
100 Flatbush in the Brooklyn Daily Eagle
100 Flatbush in Bklyner
100 Flatbush in Curbed
100 Flatbush in The Architect’s Newspaper