Some cant go to sleep unless it is handled.

If you find anything bad, you can cancel the deal or negotiate a lower price, or make the sale conditional on the seller fixing the deficiencies.The point is the seller and seller's agent does not want to go to the trouble of disturbing the tenants and arranging an inspection unless they know you are a serious buyer.

If ithe critter gets loud or disturbs others, send a notice.

If the latter, it seems to create an application for each "sleeping room." 

Place was trashed when they moved out and the one tenant that had been evicted kept breaking back into the property at night to sleep. 

Some Mexicans (guys from Mexico) have crazy experience in rock work and know how to do this stuff in their sleep.

If your husband will lose sleep over this at night, then lock it up and don't let anyone use it.

A majority of wholesalers and a disturbingly high amount of agents do not know about this. 

Asbestos - apparently is not an issue if you don’t disturb it, but most people don’t want it there and it’s expensive to coordinate professional removal. 4.  

Once their need of importance is satisfied, you should be able to go about your business without further disturbance.