They are not interested in lending the money but rather are interested in a percentage of the cut.

I'm trying to protect myself to make sure the potential cash buyer just doesn't go behind my back and cut me out of the deal completely.

Start with your local building and safety department.

Even concrete floors can be cut and polished, so with the correct tools to cut the surface back I'd assume this could be repaired as well.

Yes, they now make a laminate that can do a square edge without the brown line that makes it look like laminate!

My grandmothers family will be using a probate attorney to review my offer.. they want to cut down on all fees.

I also don't care about the employment history either because if they get lose their job or get their hours cut they simply send an email to me and the Housing Authority and the housing authority starts covering 100% of their rent until they get another job. 

It is not like land is in some high demand where it sells quickly and dealing with land is a very specialized field since there are thousands of issues that need to be ironed out before a lot sells e.g. nobody wants to buy a lot where you can't build what you want on the lot because the last blue butterfly in the world lives in a bush on the lot, or the lot is on an earthquake fault, or there is the county will not let you build a structure on the lot more than 10 feet tall, or you cannot cut down a 100-year old tree right where you want your building to go and the list goes on and on.

The power and all other utilities are off, grass not cut (we had it cut twice) and cobwebs are covering all points of entry.

They offer levels of safety because they offer other "exit" plans.I agree that The Book on Estimating Rehab Costs, together with the calculator in the tools section can be very helpful.