What you explained in your post is kind of my fear and I don't want to fear it so much to where it prevents me from acting. 

See: LLC vs UmbrellaLLC's does not prevent people from suing you personally, and for this reason if you are insured under an LLC, you should also get an endorsement that covers you personally.

Their process typically consists of using a drylock type paint to cover the mold to kill/prevent it from spreading and they use a portable ventilation system to vent out the air containing mold.

The seller's agent should most definitely limit the exposure to prevent a conscious or unconscious discrimination based on a protected class. 

The ONE exception to this would be if there is a court order, such as an Order of Protection issued by a Judge and the property was listed as a "protected address" then she would be prevented, by court order to be there, however that is highly unlikely for a rental property.

If you are remaining in the deal long term, such as when doing a sandwich lease, you need to protect your position and cloud the title to prevent a homeowner from selling the property behind your back. 

The high cost of loans and mortgage as well prevents the middle class from owning homes.

Make it part of the renewal addendum then put everything into place.This is one of those "ounce of prevention is worth a pound of cure" instances. 

How many of you actively pay for preventative maintenance for the HVAC system and or other appliances (washer/dryer/etc)?

Gutters will help prevent more water from splashing up on the siding I am guessing.