Colo. Rev. Stat. § 37-48-152
All special improvement assessments against appraised benefits and interest thereon and penalties for default of payment thereof, together with the cost of collecting the same, from the date of the filing of the construction fund special assessment record in the office of the treasurer of the county wherein the lands and property are situate shall constitute a perpetual lien in an amount not in excess of the benefits severally appraised upon the land and other property against which said special improvement assessments have been levied and such benefits appraised; and no sale of said property to enforce any general state, county, city, town, or school tax or other lien shall extinguish the perpetual lien of said special improvement assessment. At any time, any landowner may pay the full amount of said special improvement assessment, and thereafter the property of any such landowner shall be clear and free from said lien and shall not be subject to special improvement assessment for and on account of benefits appraised against any other land or default in the payment of special improvement assessments made against any other land.
C.R.S. § 37-48-152