Ray I am not positive about this but I believe your IRA has to be self directed.
This is a huge CPA question and I bet our friend FSD, while not a CPA will have insightful commentary here.
That said, my uninformed opinion is that in order for a property or trust deed or anything of that sort to be held by the IRA you need to find an entity that will allow you to move your IRA into a self directed IRA. Thus the title is actually held by the IRA. It is pretty complex but I think you get the idea of what I am talking about.
Now if you are talking about using some of the IRA money to help with a downpayment or something of that nature then it is an entirely different conversation. Basically you are taking a loan out. There are tax laws and implications as well as interest to payback but again, this is a CPA question even though there will most likely be many helpful responses to your post.