The Metropolitan Planning Commission (MPC) is in the process of preparing an updated zoning ordinance for the city of Savannah. This process is the second phase of the Tri-centennial Plan. The first phase was to prepare a unified comprehensive plan for the city of Savannah and unincorporated Chatham County (Chatham County-Savannah Comprehensive Plan). The plan was adopted by the City Mayor and Aldermen and Board of County Commissioners in November 2006 and updated by both, respectively, in 2016 and 2017.