And, likely, it's that the root problem of the place not being able to maintain a reasonable temperature has not been resolved.

Don't try to name every scenario, just state that if the clog isn't caused by roots or a collapsed sewer line then tenant will be charged for cost + admin fee. 

They will get married have kids want to plant roots  will understand that rent is throwing money down the tubes and will go looking for housing to buy. 

(Hey I was rooting for Denver!

This is a family that has lived in Oregon FOR DECADES and has a lot of roots in the area.

The property is in an older part of Colorado Srpings with mature trees and the roots have breached the pipe creating a hole.

@Geoffrey HoffmanI am rooting with Geoffrey here.

there has to be some kind of force pushing the wall in, it takes a lot of time to move a wall that far, the last one I ran into was tree roots pushing the wall in, it could also be a stone foundation that is crumbling and has been scratch coated to cover it up, I would suggest getting a pro to come out and dig up outside footing and wall....done mostly by hand due to the fact that you could cause a cave in with heavy equipment.

It has been great but I am excited to get back closer to my roots again, at least for a while.

@John Pruner .....poking you to remind you we're all rooting for you and curious how it turns out!