They paid around $150k in rent during these years.The mold report is from February 2017.I do not know if the seller gave the tenants a copy of the lab report.

Because if you read their contract, you will see that they will charge you through the nose first to rent to this tenant, then for fees for every single possible maintenance problem they can conjure up, and they will not only charge you exhorbitant fees for the maintenance, but also for supervising the maintenance.  

I wouldn't call losing 1/3rd of your living space, having strangers making a lot of noise in your home at random hours, having to take off work to supervise those strangers to make sure they don't steal anything, and having an area unsafe for kids when you have kids an inconvenience.If you aren't providing a habitable unit the tenants are not required to pay rent regardless of if you say so in your lease.

They also won't guarantee that the tenant won't park on the lawn, have loud parties, create a meth lab, on and on.I learned quickly to just say no to co-signers.  

However, real service dogs are virtually always highly "trainable" breeds, such as labs, golden retrievers, labradoodles, and herding breeds (border collies, corgis, etc.)

Do they charge you a supervision fee for supervising the workers every time one goes to your property - in addition to the actual charge for the plumber? 

They charge separate fees for supervising maintenance issues, they charge you separate fees for their maintenance workers to do anything.My daughter, for instance, had a contract where the PM could do any maintenance under $250 without getting her permission first, or for emergencies. 

We use studies by Berkeley Labs, Zillow and the NAR as well as DofE and HUD.

Pet Addendum to contract that includes that the pet must be on leash at all time when outside the unit.Don't be fooled by a pet's size; I'm a dog parent to a Lab who think she owns the world.

Ok....here's the full fledged list of preparations:First be sure to wear one of those white lab suits with hood and footsies just to make sure you don't shed any dna containing cells.