Ideally, you could borrow the money at an agreed upon interest rate, buy the house, and pay them back when you sell it. Then it is your deal, and only financed by them. The profit once they are paid back is yours.
However, you may not find an investor willing to accept those terms, and you'll have to negotiate. It depends on which party needs the other more. If you can provide them expertise and security that they cannot just go out and replace easily, then you have more power to get better terms. If they are the only party willing to lend you money, and you can't get it thru a bank or other investors who will agree to more favorable terms for you, then they will be in a position of strength, and you will have to accept their terms or get out of the deal.
There's my two cents...
However, you may not find an investor willing to accept those terms, and you'll have to negotiate. It depends on which party needs the other more. If you can provide them expertise and security that they cannot just go out and replace easily, then you have more power to get better terms. If they are the only party willing to lend you money, and you can't get it thru a bank or other investors who will agree to more favorable terms for you, then they will be in a position of strength, and you will have to accept their terms or get out of the deal.
There's my two cents...