Colorado Revised Statutes Title 39. Taxation § 39-12-113. Redemption of proportionate interest

(1) Any person who has or claims an interest in or a lien upon all or any part of any undivided or divided estate or interest in any piece or parcel of land or lot for which a tax lien was sold pursuant to article 11 of this title may redeem such undivided or divided estate or interest by paying to the treasurer his proportionate part of the amount required to redeem the whole. In such case the treasurer shall issue to such party a certificate of redemption for his interest in such land or lot, as provided by law.

(2) In the event that the treasurer cannot definitely ascertain the amount required to redeem the portion sought to be redeemed, he shall request the assessor to determine the valuation for assessment on such portion sought to be redeemed as of the original assessment date for the tax upon which the sale of the tax lien was based. Such assessor shall furnish such valuation for assessment to the treasurer forthwith. The treasurer shall thereupon ascertain such proportionate redemption amount as that amount which bears the same proportion to the amount required to redeem the entire piece or parcel of land or lot for which a tax lien was sold as such valuation for assessment so furnished bears to the original valuation for assessment of the entire piece or parcel of land or lot for which a tax lien was sold.