For each city, village or incorporated town having a population of 500,000 or more inhabitants, there is established a license appeal commission consisting of the chairman of the Illinois Liquor Control Commission, the most senior member of the Illinois Liquor Control Commission who is not of the same political party as the chairman, and one person who is a resident of the particular city, village or incorporated town selected by the council or president and board of trustees, as the case may be, who shall serve for a term of 4 years and until his successor is selected and takes office. Neither the mayor, president of the board of trustees, nor any member of the council or board of trustees shall be eligible for membership on a license appeal commission. Each of the 2 members of the Illinois Liquor Control Commission shall receive a $200 per diem for their work on the license appeal commission, and the other member shall receive an annual salary which shall be paid by the particular city, village or incorporated town. The secretary of the Illinois Liquor Control Commission shall be ex-officio the secretary for each license appeal commission.