Okla. Stat. tit. 68 § 2887.1
A charitable institution requesting an exemption pursuant to the provisions of paragraph 8 of Section 2887 of Title 68 of the Oklahoma Statutes shall be required to file an application initially with the county assessor of the county in which the property is located, and, if the information contained in such application complies with the requirements of paragraph 8 of Section 2887 of Title 68 of the Oklahoma Statutes, the property shall be exempt from the date of acquisition thereof by the charitable institution until the earlier of the date of disposition of the property or the date of cessation of compliance with the requirements of paragraph 8 of Section 2887 of Title 68 of the Oklahoma Statutes. The charitable institution annually shall evidence the continuing compliance with such requirements by filing an affidavit with the county assessor, stating whether and the extent to which the property continues to qualify for the exemption.
Okla. Stat. tit. 68, § 2887.1