Granted, he has owned it about 20 year now, if I recall correctly.  

We did provide comps from the neighborhood, but they refused to correct the appraisal.

Redfin and zillow should give this data freely..correct?

I’d recommend consulting with attorneys experienced in both Illinois and Wyoming laws to ensure everything is set up correctly.

so after reading all the posts, it sounds like his best bet is just to move on and walk away finding another place maybe coming back in future to keep contact with that person if he really wants that location… Correct me if I’m wrong, but my analysis from all this is that hiring a squatter would only be applicable in situations where the person who is occupying the residence never had a lease or contract therefore it is a rare circumstance where it would be a viable option. 

So if this is correct..

I agree with @Brandon Rizzo I think the supply will normalize as the migration to Texas has not slowed down and as builders make correction to a more balanced supply and demand (along with interest rate improvement) housing market will be better.

., the person living in the property.Let's assume I'm correct with the above (please set me straight if that's not the general case).

We are at an oversupply.But now we're seeing the correction. 

I saw that depreciation can be corrected on a single form.Also I do not understand how/where to do a partial asset disposition in turbotax.