Overall I do believe it's going to be a great stepping stone and learning experience as well as friendship and partnership.

What I'd be leary of is the friendship ending if they can't pay in future.

You will have to learn when to turn off friendship and turn on business. 

But in this situation, I got a friendship that is more valuable and important.

for us being friends, she said this is already a friendship discount, since she normally charges 25-35% for other clients (which I don't think she even has other clients, because she started her own company and used foreign investment money to flip places and pay back the investment capital + interest)Her current estimate of 100k is only her guesses, without really having anyone or any real contractor giving her a solid quote.

The outcome was a positive cash gain, longterm connections/friendships, and inspiration to move the next deal.

Your friendship and positively is a blessing I appreciate. :)

Add value to someone else for free education and building a friendship/relationship. 9.

*I do know the sellers son so remember that as I don't want to mar any friendships with them *I need help applying these numbers to a calculator as I believe that is the next step if there is anyway I can get someone to help with    that. 

(We can debate alcohol as a social lubricant another time and whether or not it really makes me more charming).After a while, I would talk to the same 3-4 people each time and eventually friendships - and later, business partnerships - blossomed.