Arnold Ventures is a philanthropy dedicated to improving the lives of all Americans through evidence-based solutions that maximize opportunity and minimize injustice. This program seeks letters of interest to evaluate the impact of recent state and local policy reforms that legalize or encourage new housing supply, including effects on early development activity, housing production, and housing market outcomes. This RFP focuses exclusively on the measurement and evaluation of housing supply policies at the state or local level. OFR Contact: Catherine Cotter. Amount: $200,000 to $400,000. Deadline: 3/27/26 (LOI).