A new affordable housing proposal has ignited debate over the role of single-family homes in Cambridge. Titled the âMissing Middle Housing Petition,â the proposal is sponsored by the affordable housing nonprofit A Better Cambridge and the Boston Sunrise Movement, and calls for zoning changes to allow for the construction of more multi-family âmiddle housing,â or four-plexes, triple-deckers, and townhouses. Over the last week, the petition has been met with mixed responses from City Councilors and residents. At an April 8 Ordinance Committee meeting, the City Council voted to keep the petition in committee pending further review and feedback from the Community Development Department, the cityâs planning agency.