In the State of Colorado, an Improvement Survey Plat is a “monumented land survey” showing all visible improvements situated on a particular parcel and within five feet of the boundaries of said parcel. A “monumented land survey” is a boundary survey in which all monuments are either found or set. If monuments are set in a platted subdivision older than 20 years old, a surveyor must also file a “Land Survey Plat” with the County Clerk Recorder’s office.