Making my list of properties to protest my taxes, same as last year.   

Our realtor is going to get us copies of the leases if we want to protest them or change them.She could not define our options as she stated that any sort of legal action would require an attorney, just as you said @Fred Heller.

Is the area in demand enough where you can increase the rent without your tenants protesting?

In Cook County, Illinois, the courts do allow a protest after the tax buyer has started the process of acquiring the property.

Most were around 40-60%.Has anyone else had the same problem and would you be interested in a coordinated effort to protest the assessments?

I am obviously protesting these appraisals.

Does anyone try to protest their property tax assessment using the Zestimate, in cases where they underestimate the value?

I filed a protest.

In places like CA, the owner has a time period after the lien is sold in which the have a certain time period to protest the taxes, but not in IL.  

Lock arms with my brothers and sisters and march in the street protesting the injustice of making me get a license.