At the time of levy or promptly thereafter, the levying officer shall serve a copy of the writ and a notice of levy on one occupant of the real property. Service on the occupant shall be made by leaving the copy of the writ and notice with the occupant personally or, in the occupant’s absence, with a person of suitable age and discretion found upon the real property when service is attempted who is either an employee or agent of the occupant or a member of the occupant’s household. If unable to serve such an occupant at the time service is attempted, the levying officer shall post the copy of the writ and notice in a conspicuous place on the real property. If the real property described in the notice consists of more than one distinct lot, parcel, or governmental subdivision and any of the lots, parcels, or governmental subdivisions lies with relation to any of the others so as to form one or more continuous, unbroken tracts, only one service or posting need be made as to each continuous, unbroken tract. (CCP 700.015(c)
The number of services or postings required, where several lots or tracts are attached, depends upon the number of continuous, unbroken parcels. Remember that a street would break the continuity, and an alley between lots would probably do likewise.