I attempted to access and delete the fake listing but was unable to, as Zillow indicated that I am not the owner of the property.

I attempted to provide the most transparent and up to date information on this site. 

At this point, I simply want to move on and feel the exit interview is a final attempt to have me sign things that I don't agree to.

Yeah, I think you may be missing an attempt at humor here....but then you are an accountant..... :-)

Attempted to report him to state agencies but there was no clear jurisdiction.

He also doesn't control regulations in the states/cities, but his attempts to cut regulations may trickle down and impact personal property rights and people's ability to use their properties as they see fit.

Even with a completed sale often times you might need/want to pay a lawyer to do a quiet title action to quell any possibly attempts to reverse the sale by an interested party.

Their pivot to ADUs more recently is an attempt to increase affordable housing in many of those same areas. 

Both screen doors upstairs do not function correctly.Plumbing problems-The garbage disposal in the kitchen was not cleaned, is smelly and the rubber is flipped outwards.The bathroom sink in the smaller bedroom does not drain correctly despite us using an entire bottle of drain cleaner on it.Common areas that are not kept clean or have garbage-There was no attempt to clear the patio of years of accumulated debris and filth.

Definitely follow the regulations in the area and if permissible I would offer to attempt to find an acceptable tenant and terminate their lease when that happens but in the meantime they will need to continue to pay.