California Code, Labor Code - LAB § 2504

(b) The successor grocery employer shall maintain a preferential hiring list of eligible grocery workers identified by the incumbent grocery employer or collective bargaining representative pursuant to subdivision (a) and shall hire from that list for a period beginning upon the execution of the transfer document and continuing for 90 days after the grocery establishment is fully operational and open to the public under the successor grocery employer.

(c) If the successor grocery employer extends an offer of employment to an eligible grocery worker pursuant to this part, the successor grocery employer shall retain written verification of that offer for at least three years after the date of the offer. The verification shall include the name, address, date of hire, and employment occupation classification of each eligible grocery worker.