@Timothy Riley
I would suggest focusing on the big picture of holding real estate in an IRA before you go looking to understand the complexities of investing IRA funds through an LLC.
While I can't give you advice, I'd like to paint a quick mental picture and let you make sense of it. For starters, picture your IRA as a separate person other than yourself. Your "IRA" money has already been set aside in an account and withdrawing the funds at this point would mean a taxable event and possibily early withdrawal penalties (10% extra). Since withdrawing the money is typically not very ideal, the alternative is the use the structure that you already have put in place. Consider the tax-advantages associated with your specific account type when choosing which deals work well in an IRA. The next big question becomes, what would you like to invest in and feel confident about?
Look into leveraging the IRA and using that ordinary deductions to offset UBIT. Many people frown at UBIT and holding real estate in an IRA with leverage but crunch the numbers for yourself and see what makes the most sense. Check out my recent BP blog on common UBIT questions/answers.
Best of luck to you Tim!