The Alloy- 505 Street

New York City's first all-electric and passive house skyscraper. A mixed use tower with 440 market rate and affordable homes and retail spaces along Flatbush Avenue. The building is the first tower of phase 1 of The Alloy Block and was completed in Spring of 2024

Part of the first phase of a larger full block development in Downtown Brooklyn that is on track to become the most sustainable block in Brooklyn, powered by local renewable energy.

Architect: Alloy LLC

Contractor: Alloy LLC

Developer Alloy LLC

Website: https://www.alloyllc.com

added on June 19, 2025

Passive House in New York City

"Passive House" is an important building standard that brings efficiency and comfort together. New York City has a growing number of these new, state of the art buildings that save money and the climate. Also known as Passivehaus (this standard has German roots), several of the newest buildings came from this national database, Passive House Projects. This map is made by Green Map System's own local Green Map NYC project. We created our first Passive House Green Map in 2013, and in summer 2025, 50 buildings were added and/or updated by Simone Reckhaus, our intern from University of Bologna in Italy. Share this Green Map at bit.ly/PHBldg-NYC. Add new buildings to this map at bit.ly/AddBldg

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