Transforming existing buildings is especially challenging with public-owned affordable housing buildings that rely on public funding and grants and must continue to house residents during major renovations. This session will share the successes of the Cambridge Housing Authority (CHA), which in 2014 vowed to reduce energy intensity by 20% in a decade.  CHA met that goal in only four years, and continues to improve their portfolio. Speakers will discuss incentives, strategies, priorities and certifications integrated into the design and planning process. Case studies, including Manning Apartments, Burns Apartments and Putnam Gardens, will highlight funding strategies and sustainable design/energy choices, current design/construction challenges, and lessons learned.