Chapter 40B (1969)
Massachusetts passed Chapter 40B, allowing developers to bypass local zoning if at least 20-25% of units are income-restricted. The law was designed to overcome suburban exclusionary zoning that blocked affordable housing.
Enabled thousands of affordable units to be built across the state, often over local opposition.
Created ongoing tension between local control and state housing policy that continues today.
Like the current BPDA approvals, 40B is a mechanism to add housing supply in the face of local resistance. It shows how state and city policies can work to overcome zoning barriers.
