Look for any walls or areas of prior water issues, including the attic, roof, bathrooms.

Your time is valuable, and if the buyers are serious, they should have no issue and realize this is standard.

Would I be able to issue a pay or vacate if she pays on the 2nd again? 

I'm holding onto my cash for any unseen issues..  

That's why you screen them...Would rather lower the price or improve the space to find a higher quality tenant, of course if those things don't help then likely it is the area that is the issue when it comes to finding higher quality tenants. 

It could be something legit like a single mom fleeing a domestic violence situation and staying in a shelter,  but I think more often its an indicator the tenant has other issues a landlord wants no part of. 

Would any lender be ready to issue cashiers check for an amount which I request for ( to be used during the day of the foreclosure), with a lien on the property which we buy (the property is subjective to what we bid for and not definite). 

While they don't look at your DTI, they will, at least initially while building a relationship with the lender, check your credit score which will affect your rate.Business Line of Credit - Most banks will want to see you in business for 12-18 months before issuing you a Business LOC.

One issue is that many places have open listings, so that means compensation to the agent goes to whatever agent brings the buyer, so you'll get 10 or 100 agents all posting the same listing, so can be difficult for buyers to sort through. 

It's important to pull the emotions out of it!