A Deed of Trust should be filed with the County Clerk in the county where the property is located. (6) "Security instrument" means a deed of trust, mortgage, or other contract lien on an interest in real property.(7) "Substitute trustee" means a person. Collin County Certificate of Trust Form. Fill in the blank form formatted to comply with all recording and content requirements. Other real estate documents discussed herein include: Deed of Trust; Real Estate Lien Note (Promissory Note); Deed of Trust to Secure Assumption. 1. The name of the current owner (this is the grantor). 2. The name of the new owner (this is the grantee). 3. Insert the property description information and the address in the Short Form Deed of Trust. The release form is submitted to the Public Trustee's Office in the county in which the property is located.