You either treat it like a business (or hire a professional PM if you are unable) or you will fail. 

The HOA decided to hire a water mitigation or cleaning company that basically went to all the homes affected and cleaned up.

Would be happy to provide any additional information as needed.

I think this is informative for investors looking at the downtown business district, as well as the surrounding neighborhoods. 

but there are missing pieces of information that would make this a great or not-so-great idea, like your skill set, the amount of time you can dedicate to RE weekly..

Everything is just very general information with no details. 

hire an appraise4 specializing in land and zoning. 

Thank you for replying to my post and sharing information I am very appreciative. 

Quote from @Kevin Zheng: Hire an attorney immediately and get them out.The tenant can tell your parents are at a loss of how to proceed, so the tenant is taking advantage of that weakness.

If you would like more information feel free to reach out.