C.R.S. § 7-47-103: Land surveyed and platted.

Such corporation shall cause its land, or such portion thereof as may, from time to time, become necessary for that purpose, to be surveyed into lots, avenues, and walks, and to be platted. The plat of ground as surveyed shall be acknowledged by some officer of the corporation and filed in the office of the recorder of the county in which the land is situated. Each lot shall be regularly numbered by the surveyor, and such number shall be marked on the plat.