A Release of Deed of Trust is a document signed and executed by the current beneficiary of a Deed of Trust. The release form is submitted to the Public Trustee's Office in the county in which the property is located. The purpose of the release is to remove all (Full) or a portion (Partial) of the property from the lien created by the Deed of Trust.
A recorded (by the County Clerk and Recorder) Deed of Trust is a legal record of the lien against the owner's property. When recorded a Deed of Trust creates a lien against the Grantor's property. When the terms of the Deed of Trust are satisfied, a request of Release of Deed of Trust must be recorded to remove the lien from the property.
Requirements for a Release of Deed of Trust are described in Colorado Revised Statutes § 38-39-102, and must be precisely followed by the Public Trustee in the county in which the property is located.