California Code, Public Contract Code - PCC § 20450

If a resolution required under Section 20449 proposes to include additional territory in the assessment district, at least 15 days prior to the hearing fixed therein, the clerk shall mail a copy of the resolution to all persons owning real property within the additional territory whose names and addresses appear on the last equalized assessment roll or as known to the clerk.  This section shall not apply if the hearing of objections is not required pursuant to Section 20449.