We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

That doesn't mean you don't give a little (eg a tenant has an issue with a pay cheque and asks to pay the rent 2 days late), but don't make it a habit and don't do it repeatedly for the same tenant. 

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

Maybe they can post notice on the building that it is not habitable. 

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.

But it’s the invisible harm to the people who can’t get a new rental that are harmed.

The best thing you can do to protect yourself is to have the basement tested for mold by a company that does only mold testing and not an abatement company.At the same time, you can send your tenant a letter warning them that they will be liable for mold testing if no harmful mold is found and you will pay for testing if any harmful mold is found.The very next thing we do is; send your tenant a certified letter telling them that if they suspect their health is at risk for any reason that relates to their rental unit then your tenant should not reside in your unit for one more minute and should move to a place they feel is safe because you will not assume liability for exacerbating their health issues, if any health issue in regards to mold exists.At this stage, all communications must be in writing and well-thought before communicating.Your situation has happened to us several times and we had a tenant who lived in a brand new unit for only 10 days and he told us he was vomiting and had nose bleeds that resulted from mold.

I don't think there is  harm in filing a report but I doubt it will help much assuming you have photos. 

While, technically, it might be at risk, it's possible a judge may not enforce the surrendering of the entire deposit, since the sellers would not be too harmed, having so many buyers waiting in the wings to take over your position.You are also not necessarily tied to just one appraisal, unless it is an FHA loan.

We don’t know any PMCs to recommend in the area mentioned, but since selecting the wrong PMC is usually more harmful than selecting a bad tenant, you might want to read our series about “How to Screen a PMC Better than a Tenant”:https://www.biggerpockets.com/member-blogs/3094/91877-how-to-screen-a-pmc-better-than-a-tenant-part-1-services-and-processesWe recommend you get management contracts from several PMCs and compare the services they cover and, more importantly, what they each DO NOT cover.