A deed of trust is a security instrument, just like a mortgage. In this section, you can find information and answers to the following questions: 1.Essentially, a deed of trust provides a lender with security for the repayment of the loan and effectively functions similarly to a mortgage. Alameda County Deed of Trust Form. Fill in the blank form formatted to comply with all recording and content requirements. Record the deed at the county recorder's office. Notify the relevant parties, such as your mortgage lender and insurance provider. Below you will find information about the services we offer and addresses to our Oakland and Tri-Valley office locations. A trust deed is always used together with a promissory note (also called "prom note") that sets out the amount and terms of the loan. Check and complete as applicable.