California Code, Revenue and Taxation Code - RTC § 4131

(a) The satisfaction and removal of any lien secured to any parcel of tax-defaulted property, and if the right of redemption has not been terminated, to any parcel of tax-defaulted property subject to a power of sale pursuant to Section 3691.

(b) The redemption of any parcel of tax-defaulted property and, if the right of redemption has not been terminated, any parcel of tax-defaulted property subject to a power of sale pursuant to Section 3691, separately from the whole parcel which originally became tax defaulted, if the parcel sought to be redeemed (1) is described in any duly executed and recorded deed, purchase contract, deed of trust, mortgage, or final decree of court; (2) had a separate valuation on the roll of the year for which it became tax defaulted; or (3) has a separate valuation on the current roll.