Specifications include, but are not limited to: One of the critical functions of city government is the collection of property taxes and other sources of revenue. Property tax collection accounts for 70% of revenue collected by the City of Boston (“the City”). The property tax levy has always been the City’s largest and most dependable source of revenue. While property tax remains the primary revenue source for all City services and departments, in Massachusetts, Proposition 2 ½ constrains the amount of property tax revenue that the City can raise each year from its existing tax base to a 2.5% annual increase. It is important for the financial health of the City that the property tax levy continues to grow, combined with diversification of the City’s revenue sources. Efforts continue to reduce the City’s reliance on the property tax through increasing existing or establishing new local revenue sources.