Cal. Sts. & High. Code § 5022.5

“Lot,” “portion of lot,” “land,” “piece,” or “parcel of land,” whether used singly or in combination, may, in the discretion of the superintendent of streets, for purposes of spreading assessments and calculating benefits include any contiguous real property under the same ownership as it appears on the last equalized assessment roll used by the assessing entity in which the property is situated, whether consisting of unsubdivided land or land subdivided into blocks or lots and blocks or the superintendent of streets may if requested by such owner make separate assessments against portions of such lots or parcels of land.