East 231st St. BronxA three-story, 15-unit building in the Williamsbridge section of the Bronx, built in 2011 under HPD’s Third Party Transfer Program.
Lemle & Wolff constructed this building using Insulated Concrete Forms (ICF). ICF is a system of formwork for concrete that stays in place as permanent building insulation for energy-efficient, cast-in-place, reinforced concrete walls, floors, and roofs. The forms are interlocking modular units that are dry-stacked without mortar and filled with concrete. ICF systems are not yet commonly used in the Northeast region and this building is one of the few affordable housing projects in New York City that used the technology in the building design.
The building has other green features including corner window units, glass-enclosed exterior stairways to maximize sunlight, and the placement of the heating plant on the roof of the building.
Total units: 15
Construction contract: $3.9 million