Sts. & Hy. Code, § 8348

(a) Within 30 days after receipt of the notice of the vacation proceeding, the public body may:

(1) Determine that public convenience and necessity require a public easement to maintain, operate, replace, remove, or renew its existing works installed in the street or highway that is the subject of the vacation proceeding.

(2) File for record in the office of the recorder in the county in which the vacated street or highway is located, a verified notice of its public easement so determined over the street or highway, or part thereof, that is particularly described in the notice.

(b) Failure to record the notice of public easement within 30 days after receipt of the notice of the vacation proceeding extinguishes the right of the public body to a public easement.

(c) If the local agency fails to give the required notice of the vacation proceeding, the public body may determine and record notice of its public easement at any time within 180 days after recordation of the resolution of vacation. The failure of the public body to record its notice within the 180-day period extinguishes the right of the public body to a public easement over the vacated street or highway.