Loc has good reason to look at balloons as a future disaster, most all are very poorly underwritten, usually just agreed to, without any due diligence and yes, those collapse.

I don't think a collapse will be headed our way, but I do believe that we will see home prices begin to plateau until rent values come up and encourage investors to push towards SFR's instead of multi family.

It seems that most of the contractors left the state with the housing collapse and are slowing coming back but the handyman is hard to find.

You sewer collapses?

As an added bonus; the tenant broke into the property a few days after her lease wasn’t extended, poured cement down the kitchen sink and turned the water on causing the entire floor to collapse in that section of the building.

I was there in 2007-2008 and watched my real estate investor friend's portfolios collapse one by one.

If we start implementing laws like they have in Florida after the mid-rise collapse, that will make selling even more troublesome.#4  As time goes on if you don't have a very proactive HOA board, this also creates issues. 

Also, if you wait, you can find some decent deals in down markets next time things collapse, one of our Rittenhouse condos we picked up in 2013 has appreciated 40% since then, so no complaints there.

Euro collapse.  

The market collapse after that left us upside down on the home (not even counting the thousand of dollars we put into the home from cash).