I believe this is why it's called an illegal split.I called the listing agent and he was very pessimistic about the property and didn't even want to discuss how to proceed with remedying the situation.

A Living Trust is not expensive to set up. 1. decide who is in charge 2. decide who gets what percent of the assets when you die 3. list the asset. 

What a good website to post a listing for office spaces?

Gutters, downspout repair, siding etc-good reviews on angis list, has his company registered as a LLC, referred to me by a local contact -can provide proof of insurance but will not add me to it as additionally insured. 

The list will not be accurate so I would use this as a list of potential sources to investigate. 

Just not sure how much I should emphasize it in my listing or in messages prior to their stay.

Make a list and start looking closely at each one to see if they are an option.If you can't find someone within your network, expand your network.

When we go to buy a property we make a list.  13 on the last list.  

The ones that match your criteria are listed/sold at $735,000 on the low end and up to $1.5M. 

I have used Rentredi to send the listing to Realtor.com and used Zillow Rental Manager for syndicating to Zillow and Hotpads.