California Code, Government Code - GOV § 53928

After satisfaction of the amounts distributed under Sections 53926 and 53927, any excess in the proceeds shall be deposited by the agency conducting the sale in a delinquent tax sale trust fund.  The excess proceeds shall be retained in such fund on account of, and may be claimed by, parties of interest in the property as provided in Section 53929.  At the expiration of one year following the execution of the deed to the purchaser, any excess proceeds not claimed under Section 53929 shall be distributed as provided in paragraph (2) of subdivision (a) of Section 53927.