Step 1: Prepare and file the following forms (you will need to provide the original and at least one photocopy of each form). The application for letters of administration is Form DE150 submitted with the petition and order for probate at the time the petition is filed with the court.Public Administrator. For More Information Please Contact: Assessor Property Transfer Unit County Government Center East Wing, 5th Floor 70 West Hedding Street You need to retain a probate lawyer is Santa Clara to advise you. Agent Authorization. Use this form to be designated an authorized agent for assessment purposes for the owners of real and business personal property. Birth and Death Certificates, Santa Clara County. Departments: Non City Facilities. Public Administrator.