@Lance Dacy
There are limitations surrounding the use of an IRA. The money is tax-sheltered, which means it is not "your money" until you take it out and eventually pay taxes. An IRA or 401(k) is your future self's money. However, by not paying taxes up front and on earnings along the way, the plan is to accumulate a much large amount of savings that if the money were taxed and in your hands today.
The same limitations apply to an IRA in the stock market, but of course nobody thinks about swinging hammers on their IRA's stock portfolio.
The "Should I keep the SDIRA?" questions to think through are pretty simple. Can you better protect and grow this portion of your savings in a mix of alternative assets than you can in conventional stocks in funds? And, if you are still contributing to an IRA or 401(k) that likely is in the market, do you want to be diversified with this portion being in something other than the market?
The "What to invest the SDIRA in?" piece is a bit trickier, because you will achieve the desired "protect and grow" goal for this money best by investing in something you know and understand best. What is that... within the confines of the IRS rules? There are lots of good real estate related choices, including:
- A simple long-term rental property as you mention
- Private lending to builders, flippers, or other investors
- Private REITs & Real Estate focused funds
- Real Estate Syndications
A lot of people come to a self-directed IRA with the misconception that "I am going to invest in real estate and get access to this pile of tax-sheltered savings I have in my retirement plan". Well, that is not what a self-directed IRA is, any more than what a conventional IRA is. The better way to think about it is from the perspective of the IRA as I indicated above. How can you best put this money to work so there will be more of it sitting there when you reach retirement age?