Okla. Stat. tit. 73 § 62.2
The Director of the Office of Management and Enterprise Services is hereby authorized to enter into a written agreement with the Post Office Department of the United States permitting said Department to occupy and use adequate quarters in the State Capitol for a post office free of cost to the United States. If additional space is needed, the Director of the Office of Management and Enterprise Services is hereby authorized to enter into written agreements providing such additional space in the State Capitol. The Office of Management and Enterprise Services shall also be authorized to agree to furnish light, heat, water, janitor service for said post office, and a safe receptacle in which to keep property of the United States.
Okla. Stat. tit. 73, § 62.2