Massachusetts Chapter 40B (1969-present)
Massachusetts passed Chapter 40B in 1969, allowing affordable housing developers to bypass local zoning when a town has less than 10% affordable housing. It was the first state law of its kind in the nation.
The law enabled construction of affordable housing in suburban communities that had used zoning to exclude it.
Chapter 40B remains controversial but has produced tens of thousands of units and set a precedent for state intervention in local housing decisions.
The Affordable Homes Act, which funds this round, extends that precedent through zoning reforms and the MBTA Communities law requiring housing near transit stations.
