My brother is currently in an assisted living facility , but still has a home near by. His property tax increased from $800. last year to 3,000. this year. He is a 91 year old WWII Vet . and the reason given was he is not living at home. If he was living in a nursing home instead of an Assisted living home it would be different. This is in Hancock county, IL. They said it is the law. Is there anyplace to get help. I am his sister and have Durable Power over him. I have been taking care of his bills ect. for the past 3 years. His property tax actually gone from $400 to $800 and this year $3,000.
Some places have discounts for disabled seniors, but, it seems you have explored that.
You could consult with an attorney about appealing the matter.