The county board may by ordinance appoint a preservation commission from names submitted by the presiding officers of the county board. The preservation commission shall consist of at least five members. All members shall be residents of the county and may be residents of incorporated cities, villages and towns within the county. The chief executive officer of the county board shall make every reasonable effort to nominate to the preservation commission at least one attorney, one historian or architectural historian, one architect/engineer and one real estate professional knowledgeable in preservation, and the other members shall be persons with a demonstrated interest in pre-history, history, or architecture. Terms of the initial members shall be staggered so that at least five serve respectively for the following terms: one for one year; one for two years; one for three years; one for four years; and one for five years. Any additional initial members shall also serve terms staggered in the same sequence. Successors to initial members so appointed shall serve for five year terms. One of the members so appointed shall be named as chairman at the time of appointment and other officers may be elected by the preservation commission. Vacancies shall be filled by the county board from names submitted by the presiding officer of the county board. Any preservation commission member may be removed by the county board for cause, after public hearing.