Okla. Stat. tit. 60, § 60-175.5
Trustee's title, when not divested by preceding section
The last preceding section does not divest the estate of any
trustee in a trust heretofore existing, where the title of such
trustee is not merely nominal, but is connected with some power of
actual disposition or management in relation to the real property,
which is the subject of the trust.