San Diego County Certificate of Trust Form. Fill in the blank form formatted to comply with all recording and content requirements.San Diego County Deed of Trust Form. These trusts are called testamentary trusts and are usually irrevocable. A deed of trust is a three-party way of securing a real estate deal: a lender, a borrower, and a third-party trustee. Sign up now to receive the executive summary. Create an estate plan today! If you file a new deed now, you will only need to file another in the future to update the old Certificate of Trust and Deed. They may even be willing to fill out the form for you or to give you an example. • Fill in only case caption.