Your question leads to the presumption that you want to enter into a $10,000,000 commercial deal pursuant to a contract to Purchase on which you will be obligated unless you find a ready, willing and able investor to assign the contract to; this could be risky on several levels and not such a good idea.
You also mention the use of an LOI which I believe would be much less risky. However, an LOI is intended as a device by which a serious buyer shows an interest in purchasing property but wants a non-binding agreement with the seller for time in which to do due diligence and would probably not suit your purpose.
I am a Real Estate lawyer in Chicago and if you would like to discuss please call me.
Brian Y. Hamilton
May 31, 2016