Colo. Rev. Stat. § 38-30-141
The board of county commissioners of any county, or the common council of any city, or the board of trustees of any town may, by order to be entered of record among the proceedings of any such board or council, appoint a commissioner to sell and convey any real estate belonging to such county, city, or town and to affix to any conveyance thereof the seal of such county, city, or town. Any such conveyance, executed in accordance with such order, shall have the effect of transferring to the grantee named all the estate of such county, city, or town in the real estate so conveyed. Nothing in this section shall be so construed as to prevent any such board of county commissioners from selling and conveying any such real estate belonging to such county by deed or conveyance signed and acknowledged by each member of said board and attested by the signature of the county clerk and recorder and the official seal of said county. Nothing in this section shall be so construed as to prevent any such board of trustees or city council from conveying any real estate belonging to such town or city by deed or conveyance signed and acknowledged by the mayor of said town or city, attested by the signature of the town or city clerk and by the official seal of such town or city, when any such mayor and clerk are authorized to do so by ordinance or by a vote of the residents thereof, as the case may be.
C.R.S. § 38-30-141