I had no idea Illinois was that bad. Seems almost as bad as NJ, which usually ranks first (or last) on the lists for property taxes.
I work with people that pay north of $50k/yr on their homes.
Montclair, Chatham.
NJ is typically #1 worst. Chicagoland is typically a very close #2.
I grew up in Lake County, IL, which is really bad. I grew up in Mundelein. My friends live in Mundelein, Gurnee, Libertville, Grayslake. I don't know the exact formula to calculate property taxes, but it's corrupt.
When you have a more expensive home, you pay a lower percentage in property taxes. Houses that are over 1 million will pay around 1.5%. When you are at the median, you are around 3%.
Lake Forest has the lowest property taxes (as a percentage of house value). They have the most expensive houses.
One of my friends sold his house about 18 months ago. I think he bought for 300K and sold for 365K. I think he owned it for about 4 years. In his neighborhood, there are two different types of floor plans. Medium size house (1,800 sq. ft.) and big house (2,400 sq. ft.). The taxes for the medium houses are typically 12K and the big houses are 16K. His medium size house had taxes for 10K, which is really low for the area. He got a deal on the house when he bought. Based on the lower than average purchase price, he was able to appeal and get his taxes lowered from 12K to 10K.
When he sold, his house sold for 10K more than the big houses. It should normally be 30K less. The person who bought was thinking that they would rather pay 10K/year in taxes than 16K/year, which makes sense. However, based on the new purchase price their taxes will probably adjust/increase to 13K.