This chapter providing for business improvement districts shall not be deemed or construed to affect any existing act, or any part thereof, relating to special assessments or other powers of counties, and cities, but shall be supplemental thereto and concurrent therewith.
The purposes and functions of business improvement districts as set forth by the provisions of this chapter may be accomplished in part by the establishment of a district pursuant to this chapter and in part by any other method otherwise provided by law, including provisions for local improvements.