Okla. Stat. tit. 60, § 60-178.5: Ad valorem taxation

Those assets of any trust, now being used or engaged in any

activity or function prohibited by Sections 9, 10 and 11 of this

act, and which would be subject to ad valorem taxation if not held

by public trust, shall be subject to ad valorem assessment and

taxation, and no trust created hereafter shall circumvent the

prohibition herein.