Good deal Leonardo Cadenazzi! I'm a newbie as well, but from what I have read, renovation prices are not easy to estimate. If you have some RE connections in the area, I would try to find someone who is or knows a contractor or find a knowledgeable investor that can walk through the property with you (for some sort of compensation, of course). This can help eliminate problems with finding a buyer and the buyer projecting higher repair costs that you were not aware of and you not being able to close the deal.
As far as the 70% rule, I think it depends on the margin your buyer wants and your market, but the majority seem to want 70% or better. The lower the better like Brian T. said.
I saw a formula on here somewhere that said a good idea for your assignment fee is 10% of the buyer's profit assuming the buyer makes 20% profit off of your ARV, but I cannot say whether or not this applies to any or all buyers and I would think the assignment fee would be totally up to you. Just an idea.
For instance, in your case of the ARV $268,000, assuming a buyer's profit of 20% = $53,600, your assignment fee would be $53,600 x 10% = $5,360.
Good luck!
If you don't mind me asking, what criteria was your YL campaign targeting?
