However, I made the argument to listing agent that they should want to spend the money at the very least to simply drain the basement water out since it's still an asset that is slowly deteriorating and losing value every day that the water sits there and investors/buyers will not want to take a risk on a property with a question mark like that.

Is there a risk to the end buyer (C) when doing a double closing where they are using the end buyers (C) money to close on the A-B transaction?

Buyers do not typically pay their agents.

Not all buyers are created equal. 

Would anyone care to share a really good lease option tenant buyer application form?

The buyer was insistent on getting a working heater, didn't want a $5,000 credit, and there were no standard replacement because of the age and the size of the unit.

By 2020, its going to be a GREAT BUYERS market. 

How difficult do you think it would be for me to find a buyer that would agree to a long-term (1-2 year) lease back?  

To things in perspective, this is not a distressed property with tons of chipped paint, it actually has a solid, intact paint job that I think would pass the eye test for any buyer. 

Since 3 bed/2baths are the most desirable among buyers, I have hired a contractor to turn the bonus space on the bottom level of my home to a 3rd bedroom (an option offered by the builder, but I didn't need it at the time).