Well, there goes that idea. Any chance your property was reassessed? In my county, they reassessed all properties recently for the first time in 20+ years. Some properties saw significant changes in their taxes as a result of this. I’ve heard some places will reassess upon the sale of the property which can cause severe changes if the property hadn’t sold in a long time. Depending on where you live, Zillow can be a good resource for determining historical taxes and assessed value.