If it were my deal and I wanted it I would figure that he should contribute what the regular finders fee would be plus if he is going to manage the property he would get an additional managment fee of 10%. He can want 50% or 70% but that does not mean anyone will give it to him. The only one that can lose here is you
What can he do with this deal if you do not underwrite it? That's why he is wholesaleing it because he as no money. Is this man in your town and is the property in your area?
In addition you should be running all the numbers by BP or thru the BP calculator Just because you think this is your cash flow does not mean it is correct. It could be less.
Where did you get this renovation figure from? Who did the inspection on this property and where did the renovation numbers come from? Has everything come from your friend? I hope the renovation numbers were not from your friend because it could be far more and it usually is far more. Are the tenants in place and currently paying the rent you have listed and how do you know that?