This act shall not apply to municipalities, counties, school districts, and other agencies of local government; nor to specialized agencies, authorities, and entities created by the legislature, performing essentially local functions, such as, but not limited to, Urban Renewal Authorities, Port Authorities, City and City-County Planning Commissions, Conservancy and other Districts, and public trusts having a municipality or county, or agency thereof, as beneficiary; but this act shall apply to public trusts having the state, or any department or agency thereof, as beneficiary.
Okla. Stat. tit. 75, § 250.5