Dattner Architects will present a progress report on 3 affordable multifamily buildings in various stages of construction. Project teams will share lessons learned from each building which have informed the firm’s ability to deliver high-performance housing within the constraints of limited construction budgets and difficult sites. 425 Grand Concourse is the largest Passive House project planned for North America to date. This new mixed-use and mixed-income development will create 277 units of affordable housing. The two-story base will house a medical facility, supermarket, community support space, and a new student services center for CUNY Hostos. Chestnut Commons is a 14-story building is being designed to Passive House standards and in compliance with NYC Active Design Guidelines and will exceed NYC Energy Code and Enterprise Green Community requirements. One of the first developments stemming from the East New York Neighborhood Plan, Chestnut Commons will provide affordable housing for formerly homeless and low-income households and integrates a satellite Community College campus, a food manufacturing incubator that will provide job training, and a credit union. Vital Brookdale will create 160 affordable housing units and approximately 25,000 sf of health-focused community space in the Brownsville neighborhood of Brooklyn. The project will be comprised of 32 studios, 63 one-bedroom, 59 two-bedroom, and six three-bedroom units. 133 of the apartments will be reserved for households earning between 30- 60% of area median income (AMI) and 26 households earning 80% AMI.