Need Help With Pre-Construction situation

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Hi, Well heres the situation; A good friend went into 2 pre-constructions, and put down a down payment. He now is looking to get out cause he need his down payment back for personal finacial reasons. I have a house in the area where he has this Pre-construction deal and theres a good 20,000 diffrence from contracted price to market value..... Is there anyway being creative where i can buy his binding agreement contract... then Sell my contract while its under construction? Im trying to avoid all fees, and make the dividends. The house is worth 150,000 .... The contract price is 130,000. Even if i made out on 5,000 it would be worth it.

Please insight needed

Thanks
Joe