Some people here are quick to blame the complaining tenant for clogged drains, but, in a multi-family with one sewer connection, it could be the fault of some other tenant (or a collapsed line or tree roots, etc).  

The economy can collapse and cash flow property still works.  

The roof could be ready to collapse any minute.

When he moved the TV the drywall collapsed - it was soaking wet from a poorly installed window AC.I removed the damaged drywall plus a little more to ensure I had removed everything that got wet and discovered that this 1937 plank-sheathed house does not have a vapor barrier at the exterior wall...Is this a serious concern?

The trust which owned my loan was dissolved and/or no longer reported to the SEC 1/25/2008 prior to their collapse and takeover by FDIC/JP Morgan Chase 9/2008.  

As we know, that ended in the almost collapse of the entire world's economy.

I’m with you... everyone keeps wondering when we are going to hit the top of this market, but we keep climbing at a much healthier pace than before the housing collapse.  

The bricks within the house may be removed (sort of expensive) if they are at risk of collapse.) 

@Mandi Baxter in NJ  a  few years ago we paid 30k for a repair of a single basement block wall collapse in a house that was flooded.

It may be a bad deal, but it's not going to collapse tomorrow.