In my state Iowa after the quit or cure is up, there is no turning back even if they pay in full.

If you don't notify them that you cured the problem they will condemn the house. 

You will want REAL cost to cure, not just a round number like 20k.You will want a REAL ARV apprasial showing what the value will be, along with pictures and dates sold with the price of comp. homes in the area.

The cure is often worse than the disease and the success rate is very low. 

You must inform the tenant that they can cure default by paying within this time frame.

Credit is viewed as to the situation, BK due to medical bills is almost ignored in reality, foreclosure is still an issue but understood and, what ever the issue was must have been cured, such as a death or cancer cured.

We have already been through foreclosure once this year and the buyer came in at the last minute and cured.

If the appraiser does raise concerns about the property's condition, then the underwriter will determine what needs to be cured prior to closing.

The seller has a second mortgage of 53k (HELOC) that has been charged off.So the total payoff to me to cure would be 64k and I'd need another 6 in rehab costs to put me at 70k into the deal and the property would be worth 310 at that point.

One cure for such issues is for parties to use attorneys.