Elections for the City Assembly of Belgrade, capital of Serbia, had to be set by the end of April 2018 and scheduled by the end of February 2018, since this is when the mandate of the current City Assembly and City government expires.
Parties and coalitions will run for 110 seats in the Assembly, with 5% election threshold required to win seats.
Voters in Belgrade determine the composition of the City Assembly, which in turn elects the Mayor. This means that the Mayor is only indirectly elected by the voters. Only parties which reach an electoral threshold of 5% may enter the Assembly. The Mayor may or may not be a councilor of the Assembly. Assembly’s composition is subject to a 4-year election cycle.
Sources and Further Reading
Race Starts to Become Serbian Capital’s Next Mayor
Belgrade election to take place on 11th March
http://serbianmonitor.com/en/featured/38165/belgrade-election-to-take-place-11th-march/#.Wo1NkKjFKM8