What was a low-slung corner of 4th Avenue and 25th Street in Sunset Park now has a new neighbor: One Sunset, a 14-story mixed-use building that brings 187 apartments and a top-floor rooftop into the mix. The project drops roughly 6,200 square feet of ground-floor retail into the block, adding a fresh street-level presence to a stretch that has been slowly creeping upward.
“This is where, sort of, old Brooklyn meets new Brooklyn in a way that feels real and unforced,” Elizabeth Canela, director of development for Ailanthus, said. As reported by News12, the team is pitching One Sunset as a building that respects the neighborhood’s Battle Hill topography while delivering modern, all-electric one, two and three-bedroom apartments. Canela said the design is meant to strengthen the pedestrian experience along 25th Street and help bolster nearby retail corridors.
Design And Rooftop Views
Bhaskar Srivastava, founder of dencityworks | architecture, said the architecture “steps up to give people living in the building various vantage points,” a move he described as a direct response to the site’s landform that created terraces and sightlines, as quoted in News12. Listings for the property highlight a 3,500 square foot landscaped rooftop deck on the 14th floor that frames views toward New York Harbor and the Verrazzano, while a nearly finished mural at roof level pays tribute to Sunset Park itself. Together, those pieces are meant to give residents private outdoor space and public-facing views of the waterfront that feel very Brooklyn and very high-rise at the same time.
Affordable Units And Leasing
The roughly 193,000 square foot development includes 187 apartments, with 48 permanently affordable homes at an average of about 50 percent of Area Median Income, according to the developer’s project page. Ailanthus also notes that construction wrapped up in the first quarter of 2026 and that marketing for the affordable units was coordinated with local partners. Coverage from NewYorkYIMBY details the Housing Connect listing and the lottery that opened last fall.
Amenities Retail And Micromobility
Residents tapping through the building’s amenity list will find a double-height gym, co-working lounge, private dining rooms, media spaces, a pet spa and landscaped terraces, according to One Sunset. On the sidewalk level the project brings about 6,200 square feet of retail space, with some storefronts already spoken for, as reported by NYREJ. Inside, a secure indoor bike hub run by Oonee is set to offer parking, charging and repair services for micromobility vehicles, according to coverage of the deal by 6sqft.
Community Benefits And Context
Developers say One Sunset is backed by a Community Benefits Agreement with local organizations, including the Fifth Avenue Committee, that commits to local hiring, M/WBE contracting and green infrastructure improvements, according to the project page. Supporters argue those commitments help keep some of the economic upside in the neighborhood even as new development rolls in, while housing advocates continue to push for deeper affordability across Brooklyn.
One Sunset joins a growing list of higher-density, mixed-income projects clustering along transit-rich corridors near the R train. Leasing for market-rate units is being handled by Corcoran New Development, and listings are already live on aggregator sites like StreetEasy, which shows a range of available one to three-bedroom rentals at the address. For renters chasing affordable apartments, the Housing Connect listing and reporting from NewYorkYIMBY remain the clearest public record of the last lottery. As the retail spaces build out and the rooftop mural gets its final touches, nearby residents say they will be watching closely to see whether the tower brings not just skyline views but real benefits at street level.
