S.D. Codified Laws § 9-9-20
If any municipality is governed by a board consisting of five commissioners, the mayor may exercise all the powers and perform all the duties provided by the laws of this state or the ordinances of the municipality not in conflict with the laws of the state. The mayor is the chief executive officer of the municipality, presides at all meetings of the board, and has general supervision over all departments and officers. In the absence or inability of a commissioner, the mayor shall temporarily take charge of the department of that commissioner. The mayor shall enforce all the laws of the municipality and require that the conditions of the grant of any franchise or privilege are faithfully complied with and performed. The mayor shall grant all licenses or permits, except as are required by ordinance to be granted by the board or by some other department or officer. The mayor shall supervise each public building of the municipality and each city park except in any municipality that has a park board, and the lighting of the streets, alleys, and public buildings of the municipality. The mayor shall annually and from time to time give the board information relative to the affairs of the municipality and shall recommend for the board's consideration any measure the mayor deems expedient.
SDCL 9-9-20