Community Preservation Act. The CPA was established by the state in 2000 to permit communities to levy a property tax surcharge of up to three percent for the purpose of creating a local community preservation fund which qualifies for matching state funds. CPA funds can be used to acquire and protect open space, preserve historic buildings and landscapes, and create and maintain affordable housing. Annually, at least ten percent of the funds must be used for each of these purposes; the remaining 70 percent may be allocated among the three areas or may be set aside for future spending. Harvard voted to adopt the CPA in 2001, and the surcharge amount was set at 1.1%.