This document summarizes the Portland-Vancouver Metro Area Smokefree Housing Project. The project aims to increase smokefree multi-unit housing policies through a systems change approach. This involves educating landlords on the business benefits of smokefree policies and making smokefree housing a social norm. The project has advisory boards, conducts research, develops educational materials, pursues media strategies, and sees successes like policy adoptions and over 24,000 renters now protected from secondhand smoke.