Nigel and Wayne are right: you need to fight the foreclosure in court (I am assuming you are in a judicial state where foreclosures go through the court system).

One suggestion I heard was to base it off net rather than gross rent, but I suspect that would be a fight.

If/when they get into a fight, and she's on the lease, he gets the boot when the cops show up on a domestic (he may get the boot anyway the other way, but she won't be able to prove legal residency so easily).

Make sure you check everywhere for possible issues, I had to fight with a previous landlord over there being mouse droppings hidden in a couch.Aside from that, I would just make sure prospective tenants understand what you mean by clean. 

The consumer just says the charge was fraudulent, and you can fight it, but you won't always win.

These first two items I am not as worried about since she did accept these costs, although if she does take me to court she will probably try to fight these as well.  

EVERY eviction was preceded by a series of steps, usually starting with a "pay or quit" or "cure or quit" notice, a court date, and numerous times when the tenant could have just left rather than continue to fight.  

You can never undo that loss when you sign over the $30k at close but you can fight like heck to manage that property as efficiently as possible and get the best rent that the market will bear.

Yet, a lot of what people have posted here makes sense, you usually want to insulate the floor of the attic, not right below the roof (assuming its the common pitched roof like we usually have around here) so your attic furnace would be sitting above the insulation and thus be in a very cold space when its cold outside and thus fighting a lot of extra cold as it attempts to heat the air for the unit below-doesn't sound very sensible, yet I've seen it done before.Do you know any HVAC guys you could just call and ask about it?

The beauty of that approach is you're not fighting everyone else for the property like you would be with a foreclosure.