Fast forward 2 years: one of the condos developed a leak at the piping in the bathroom, the tenant was gone for a long weekend, and water had destroyed the commercial condos one floor below and ruined $250,000 worth of computer related equipment.  

The new roof leaked water into the dining room ruining the dining room wood floor.

Many good people have had their credit ruined through divorce or medical bills.

The rare few ruin it for all but make sure in the future you do your due diligence!  

It is something they took non chalantly and stated, maybe your get paid this week but maybe not.Realize they are doing technical changes which will in long run really ruin them. 

Not only that, but they sometimes use the wrong products and end up ruining surfaces.

I haven’t had any carpet ruined by peeing so far. 

What is the toilet floods and ruins the carpet?"

and if the house is relatively new or thoroughly remodeled, that could be lower as well, but a tenant can ruin even a new house rather quickly.

I would hate to have to do this as it would likely ruin our friendship, I'm having a hard time finding other options.