The executor did not properly probate her share in the Union County court.

For background info, this is going to be a rental to students at a local grad school who will prioritize function over aesthetic. 

There is also a building that was previously used as a recording studio with a half bath (that isn’t currently functional).It needs some work.

She might not be understanding something or explaining it to officials properly and that is where an estate attorney can help.

Mini splits are notorious for leaking at the joints if not properly installed.

But, if all you have is a tax certificate, you MUST prove the tax sale was done properly, even if the other side does not raise that issue.

The key is doing a proper screening.

I'd just send them a move out list of what they need to do and if your lease states that you can show the place (with proper notice), I'd remind them of that and try to book showings as close together as possible to minimize the disturbance to the tenants. 

@Greg DevlinIf you go the passive investment route, you may check out this website that has a database of Opportunity Funds:https://opportunitydb.com/funds/If you do your own project, just make sure you have proper advice and planning before you make any purchase or investment.

And with the laws changing in many states its going to get to the point that a license is required and proper disclosures.