Question, has the foreclosure process began yet? If not he may not be in as dire circumstances as he believes. With the numbers provided, a rehabber is looking at $25,000-$30,000 profit, which some would jump on and some wouldn’t touch with a ten foot pole. If you lock it up under contract, and can’t move it to a rehabber, you may have to inform the seller that the spread isn’t enough, and start talking about a short sale option. I know in my state, Texas, short sales can not be assigned. I don’t know if that’s standard in every state, but I’d check to make sure in your state. If that’s the case, and it comes to a short sale being the only method you can use to attract a buyer, you could still birddog the property, even if you can’t assign it. It would be a shame to put as much effort into the deal as you have, and have to walk away.
PS: you may even consider purchasing the property yourself with hard money, or private investor money, but only if you think you’re comfortable handling a flip on your own. If that idea interests you but you’re still a little skidish of running your own flip, you may be able to partner with a more experienced investor and do a profit split of some sort.