As of January 1, 2018, California is imposing a $75 tax on recording documents relating to real property. There are a few exemptions, including when a Deed of Reconveyance is being recorded in connection with a Grant Deed on which Documentary Transfer Tax is being paid.
A Substitution of Trustee and Full Reconveyance is actually two documents, so two assessments of the SB2 tax in the amount of $150 are assessed.