If property is sold subject to the right of redemption, promptly after the sale the levying officer or trustee who conducted the sale shall serve notice of the right of redemption on the judgment debtor. Service shall be made personally or by mail. The notice of the right of redemption shall indicate the applicable redemption period.
Source:
Section 729.050, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CCP§ionNum=729.050..