How much is too much for an assignment fee

[Christopher Haynes]

Hello I'm am new to real estate investing and I'm located in the Maryland I have a quick question about assignment fees , I have a friend , an old high school football coach actually who's pretty much going to sell me his home he pretty much 40 thousand off the deal and that's it he really doesn't care because he sees it as me doing him a favor taking it off his hands this property could easily sell for 185k in a relatively good time period I wanted to know what would be too much for an assignment fee I've seen and heard of that buyers tend to have issues with assignments over 10k or is this something I should handle with a double close , I'm new to this, so new that I don't even have the documents need (I'm going to see a lawyer in January to see if you can draw something up for me lol)so any feedback would be greatly appreciated