Okla. Stat. tit. 70 § 23-108
Whenever a reasonable price cannot be agreed upon, or whenever the owner is legally incapacitated, or is absent, unknown, or unable to convey valid title, the Authority is hereby authorized and empowered to acquire by condemnation proceedings in the same manner as land is condemned for railroad purposes any land, property, rights, rights-of-way, franchises, easements, or other property deemed necessary or convenient for the construction or the efficient operation of any facilities, or necessary in the restoration of public or private property damaged or destroyed. No act or obligation of the Authority shall impose any liability upon the state or the Authority except such as may be paid from the funds provided under the authority of the article.
Okla. Stat. tit. 70, § 23-108