For such a large deal, I personally think it will be highly unlikely for you to find a lender who will do it without some form of commitment fee. There will be massive underwriting and massive investment of time, and if he backs out, then it was time and money spent not able to do anything.

Awesome work finding the client, but my experience has been in deals like this that they don't go very far without some DD fee.

What is the size of the DD fees you've been asked for so far?