Quote from @Jules Aton:I have no clue what infestation is considered but it sounds to me like the guests caused significant damage to your property and business.  

You fire a PM based on risk control, not calendar timing.A few things to think through:Health & habitability issues change the mathAn unresolved rat infestation for months is not a minor miss.

They have the right tools, treatments, and expertise to fully eliminate the infestation and prevent it from coming back. 

The suit alleges that the defendant has allowed severe property deterioration, including pest infestations, security breaches and maintenance issues.

I don't like D neighborhoods which would stand for Drug infested, Dangrrous, Dilapidated neighborhoods.

Bring in a licensed pest control company for an official inspection.For situations like this, I always lean on a 3rd-party professional.Their report does two things:• Verifies whether there’s actually a carcass or active infestation• Shields you from liability (“per licensed pest tech, no odor/no access/no retrieval possible”)If there is an odor from decomposition, a pro will know exactly where it is and the safest way to address it.3.

I've also had people in a nice house on acreage skip out and leave it infested with roaches. haha. 

Uneven or slippery surfaces, rickety stairs and railings, placement of outdoor grill, electrical wiring, insect infestations, etc.Yes, you do have linability insurance, but you still have a duty to mitigate risk.  

These types of infestations will have a direct effect on the value of your property and the way it performs, so continue to take preventative action.Once lease renewals come up, I'd just non renew the tenants that you think are responsible. 

Dispose of all rubbish, garbage, and waste in a clean and sanitary manner – at reasonable intervals – and assume all costs of extermination and fumigation for infestation caused by tenant; not feed straying pets or animals; not temporarily host pets.