Deeds of Trust: Which may outline an Assignment of Rents as part of the security interest. In real estate transactions, a trust deed transfers the legal title of a property to a third party until the borrower repays their debt to the lender.What is the purpose of the assignment of rents clause in a deed of trust and who benefits? Assignment of rents; perfection. Typically, an Assignment of Deed of Trust is recorded in the county recorder's office where the property is located. The specific warranties are set out in the Selling Guide. In general, I agree with the prior answer. However, a deed of trust is recorded (not filed) in the county recorder's office.