Be sure to check out the free tools BP provides to help analyze deals you may have and also market insights.

I'd suggest checking in with some social service organizations within a few miles of the property to see if they work with people/populations in the area looking for this type of house.

We often mail out the first check when we encounter these situations. 

And how often do you go back to check on your properties? 

For that you probably need a check valve or something similar to stop the sewage from coming in when the city sewer fills up. 

@Cameron Porter If you're looking at MLS properties, try focusing on ones that have been listed for 90 days or more, or check out expired listings—those are properties that were listed by agents but didn’t sell.

As others have said, you need to check the regs in the area you are looking to make sure STRs aren't severely restricted.

I didn't even think to check my local govt on the regulations about rental property.

@Tim Thompson  it could get tricky,  check your states laws on evicting victims of domestic violence.

Notified them and checked back every day.