(a) The commissioner shall have the professional jurisdiction, supervision, and control of the office and all department facilities for the mentally ill.

(b) The commissioner shall control the organization of the office and may continue, establish, discontinue, expand, and contract facilities under his jurisdiction. The facilities set forth in section 7.17 may not be discontinued by the commissioner. Units and facilities shall have such functions, duties, and responsibilities as may be assigned to them by the commissioner.

(c) The commissioner may, within the amounts appropriated therefor, lease space or facilities in which services for the mentally ill are to be provided. He may delegate this authority to the facilities development corporation.