Groton, Massachusetts has implemented several inclusionary zoning policies since 1982 to increase its stock of affordable housing units. As of 2008, Groton had 208 affordable units, or 5.2% of its total housing. Groton's zoning bylaw requires developers to provide affordable units for projects over a certain size threshold. For example, flexible developments over 10 units must provide 15% affordable units. The Town Center Overlay District also requires 15% affordable units for projects over 6 units. Groton faces ongoing challenges like increasing accessible and rental units, and addressing temporary housing needs on a regional level.