In addition to any other general or special powers vested in counties, school districts, community college districts, highway districts, fire districts, irrigation districts, drainage districts, sewer districts, hospital districts, health districts, cemetery maintenance districts, recreation districts, and airports for the performance of their respective functions, powers or duties on an individual, cooperative, joint or contract basis, said units of the government or districts shall have the power to convey or transfer real or personal property to another such unit or to the United States, state of Idaho, any city or village with or without consideration. Such conveyance or transfer may be made without consideration or payment when it is in the best interest of the public in the judgment of the governing body of the granting unit.