The director of the department of building services shall perform the following duties:
(1) Supervise and administer the department of building services.
(2) Have responsibility for the design, construction, operation, maintenance, repair, renovation, and expansion of all public buildings belonging to or used by the city, except as otherwise provided by the city manager, the city charter, or ordinance or resolution of the city council.
(3) Provide for the maintenance and upkeep of the grounds around all public buildings, except as otherwise provided by the city manager, the city charter, or ordinance or resolution of the city council.