Colo. Rev. Stat. § 31-23-216
Whoever, being the owner or agent of the owner of any land located within a subdivision, transfers or sells, agrees to sell, or negotiates to sell any land by reference to or exhibition of or by use of a plat of a subdivision before such plat has been approved by the commission and recorded or filed in the office of the appropriate county clerk and recorder shall pay a penalty of one hundred dollars to the municipality for each lot or parcel so transferred, or sold, or agreed or negotiated to be sold. The description of such lot or parcel by metes and bounds in the instrument of transfer or other document used in the process of selling or transferring shall not exempt the transaction from such penalties or from the remedies provided in this section. The municipality may enjoin such transfer or sale or agreement by action for injunction brought in any court of competent jurisdiction and may recover the penalty by civil action in any court of competent jurisdiction.
C.R.S. § 31-23-216
This section is similar to former § 31-23-116 as it existed prior to 1975.
For the requirements of monumentation of external boundaries of all subdivisions prior to recording of a plat, see § 38-51-105.