The governing board of any school district may appropriate money to pay assessments, for the improvement of streets or other public places, levied against any real property owned by, or under the control of the board, when the property is included within an assessment district formed in pursuance of any general law of the state or under the charter of any municipality. The assessments may be paid out of any funds belonging to the school district, except funds derived from the sale of bonds or required by law to be used for teachers’ salaries.