This page says that you can:
http://www.myrealestateira.com/SelfDirectedIRAFAQs.html
In general, for IRA investment in real estate, you have to find a custodian that will work with you to do it.
Check with the folks at http://www.myrealestateira.com and see what they say. But, before doing it, I would have a CPA review whatever it is you are going to do.
For more info, you can google IRA "real estate" purchase