California Code, Streets and Highways Code - SHC § 36636

(a) Upon the written request of the owners' association, the city council may modify the management district plan after conducting one public hearing on the proposed modifications.  The city council may modify the improvements and activities to be funded with the revenue derived from the levy of the assessments by adopting a resolution determining to make the modifications after holding a public hearing on the proposed modifications.  If the modification includes the levy of a new or increased assessment, the city council shall comply with Section 36623.  Notice of all other public hearings pursuant to this section shall comply with both of the following:

(b) The city council shall adopt a resolution of intention which states the proposed modification prior to the public hearing required by this section.  The public hearing shall be held not more than 90 days after the adoption of the resolution of intention.