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New York-based RKTB Architects has completed One Sullivan Place, a 12-story mixed-income apartment tower that cantilevers over the roof of an adjacent building.
The building is located in the Crown Heights neighborhood, close to Prospect Park and the Brooklyn Botanic Garden.
One Sullivan Place has a total area of 60,000 square feet (5,574 square meters) and contains 52 rental apartments, 16 of which are classified as affordable housing.
Of the 16 rooms, three are designated for elderly residents. The remaining units are calculated at market prices.
The 12-storey building, with a roughly rectangular ground plan, rises from a vacant corner lot. The site fronts Sullivan Square and Washington Avenue.
The developer of One Sullivan Place owns the corner lot and the adjacent buildings surrounding it.
The adjacent building has six floors and houses apartments. The structure looks like two different buildings, with its front facade along Sullivan Square and its front facade along Washington Avenue.
For the vacant site, the team sought to “leverage the air rights of adjacent buildings to maximize the buildable floor area of the small corner site.”
This meant designing a building that extended into the open space above adjacent buildings.
“Our team’s aim was to reconcile the smaller site size with the large amount of developable floor space,” said Peter Bafitis, managing principal at RKTB Architects.
“The team ultimately settled on a cantilever strategy that would theoretically allow them to build over neighboring buildings, but the narrow building fronts posed a significant challenge.”
The architects worked closely with engineers to design a building with “dramatically cantilevered upper floors that extend over the narrow site and onto the roofs of neighboring buildings”.
Located on the north and east sides of One Sullivan Square, these cantilevered volumes are supported by two-story steel trusses that are 30 feet (9 meters) long.
“The trusses occupy the ninth and 10th floors, acting as tabletops to support the 11th and 12th floors above,” said Nelson Vega, vice-chancellor of RKTB.
The building’s exterior is clad in red brick and metal panels. The upper four floors are wrapped with an Exterior Insulation Finishing System (EIFS), commonly known as synthetic stucco.
Expanses of glass animate the facade and provide occupants with expansive city views.
The team said these perspectives are important to “help achieve competitive market rental rates – an important component of incorporating affordable housing and senior rental units”.
One Sullivan Place is one of a handful of projects developed under a now-defunct city program called Privately Financed Affordable Senior Housing (PFASH), the team added.
The program, which ends in 2021, promotes the inclusion of affordable housing for seniors in housing plans through increased zoning allowances.
Other new residential buildings in Brooklyn include a sail-shaped tower with a concrete and glass exterior by Hill West Architects and an affordable housing development with brightly colored facades by Gluck+.
Photography is by Albert Vecerka of ESTO (exterior) and United Management (interior).
Project credits:
architect: RKTB Architects
structural engineer: GACE Structural Engineer
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