The City Council (Gemeinderat) constitutes the executive government of the City of Bern and operates as a collegiate authority. It is composed of five councilors (German: Gemeinderat/-rätin), each presiding over a directorate (Direktion) comprising several departments and bureaus. The president of the executive department acts as mayor (Stadtpräsident). In the mandate period 2013–2016 (Legislatur) the City Council is presided by Stadtpräsident Alexander Tschäppät. Departmental tasks, coordination measures and implementation of laws decreed by the City Parliament are carried by the City Council. The regular election of the City Council by any inhabitant valid to vote is held every four years. Any resident of Bern allowed to vote can be elected as a member of the City Council. The delegates are selected by means of a system of Majorz. The mayor is elected as such as well by public election while the heads of the other directorates are assigned by the collegiate. The executive body holds its meetings in the Erlacherhof, built by architect Albrecht Stürler after 1747.