Sts. & Hy. Code, § 8730

If any lot or parcel of land upon which there is an unpaid assessment against which a bond has been issued under this division, is divided, including a division into condominium interests as defined in Section 783 of the Civil Code, or the ownership of a portion of such lot or parcel of land is transferred to another person, the legislative body may order the street superintendent to file with the clerk an amended assessment of the original parcel of land affected by such division or transfer of ownership, segregating and apportioning the unpaid installments of the original assessment in accordance with the benefits to the several parts of the original lot or parcel plus costs and fees of making the apportionment. The legislative body shall, at the time of ordering the amended assessment, fix the amount of costs and fees for preparing the amended assessment, the notices, and the amended assessment diagram.