I own land and a park model trailer in a condo resort park in Seneca, Illinois. There are 6 levels of association fees. All the lot sizes are the same at approx. 5000 sq ft. The county taxes are the same for each lot at approx. $197.00. Our electric, water and sewers are included in the assessment. The 6 categories range from $674.00 to $1218.00 per year. We can't get a answer why the difference except that that is what was setup years ago. There isn't any difference in the land or location in the park. Is this OK for the association board to charge 6 different categories for association fees?