The mayor of Baltimore is the head of the executive branch of the government of the City of Baltimore, Maryland. The Mayor has the duty to enforce city laws, and the power to either approve or veto bills, ordinances, or resolutions passed by the unicameral Baltimore City Council. In addition, the Mayor oversees all city services, public property, police and fire protection, most public agencies, and shares with the Governor of Maryl responsibilities for the public school system within the city limits. As of May 2, 2019, the Office of the mayor of the City of Baltimore has changed hands 62 times with 53 different individuals in assuming office in the 220 years of city government, 1797–2017. The Office of the Mayor is located in the historic Baltimore City Hall located at 100 Holliday Street in downtown Baltimore.