If anything, most of them should have enough "free" money to pay a month or two ahead or sock away some savings.But we all know the majority of them will throw that money right down the drain on cars, vacations, new flat-screens, the latest iPhone, or some cool kicks.

Like for iPhone?

One additional possibility, IF you have hot water pipes in or under a slab, you could also have a hot water leak that is not apparent within the unit.

i run ceramiic/porcelain tiles under the cabinets mainly due to the height difference for the dishwasher. i run vinyl up to the cabinets because if there is a leak, the vinyl will trap water and rot the wood.if you dont have it under the cabinet you will get water in the basement and it will tell you there is a leak. if i was to put vinyl under the cabinets, i'd do a few long cuts with a saw to allow water to leak out if there was ever a leak.

On a couple of houses that I've had there were (IIRC) 4" X 12 with 1" X 6" laid diagonally over those.On one of those I had bad 1" X 6" but everything above those was good because we had replaced them a few years before when we replaced a leaking shower pan.

It has an active leak in the roof, but is a much higher quality house and will generate great rents as a short term rental.  

To Jerome:  That roof looks a mess, but ... it may not be leaking!

You’ll want to make sure the roof hasn’t developed leaks, the basement isn’t flooded, and that the lights turn on, the appliances work, and the HVAC and plumbing systems are functional.

Also plumbing is expensive and expect about 75% of stuff to leak from any house you purchase.

There was leaking from the roof down to the seal plate in the basement which rotted one of the walls in the lower bedroom.