A motion to convene a closed meeting must identify the subject to be discussed, the purpose of the discussion, and cite an appropriate exemption. There are two requirements set forth in the exemption allowing public bodies to hold closed meetings to discuss real property matters: (1) that the discussion concern the acquisition of real property for a public purpose, or the disposition of publicly held real property, and (2) that discussion in an open meeting would adversely affect the bargaining position or negotiating strategy of the public body.