The reform, championed by Councilors Burhan Azeem and Sumbul Siddiqui, is one of the most ambitious changes to any city’s zoning in decades.

Cambridge will now allow buildings up to six stories to be built in neighborhoods across the city, a plan designed to help put a dent in the region's housing crisis.

The Cambridge City Council Monday approved a measure that eliminates single family zoning and clears the way for increased density as the state seeks to address its housing crunch.

Cambridge has enacted one of the most aggressive pro-housing zoning measures undertaken by a U.S. city in recent years: It will now allow the construction of four-story residential buildings citywide.