To learn more about the prohibited transaction rules, see the following. https://www.irs.gov/retirement-plans/retirement-plan-investments-faqsIf you decide to invest your IRA in real estate, IRA Services Trust Company is in your area so it may be worth reaching out to them so that they can explain what their requirements are to hold IRAs for investing in real estate, as most big banks like Wells Fargo and Chase  don't offer IRAs that allow for investing in real estate.For the most part, the types of investments that cannot be held inside an IRA are:Artwork,Rugs,Antiques,Metals - with exceptions for certain kinds of bullion,Gems,Stamps,Coins - (but there are exceptions for certain coins),Alcoholic beverages, andCertain other tangible personal property.

I figured they were painted onto regular coins.

Hey @Tom Evans I do SEO for my 9-5 for about 5 years specifically for Real Estate Investors....after I saw all the money I was making them I decided to jump to the other side of the REI coin myself.  

I've been investing in crypto for over 6 years which is why I have a lot of capital.

@Joe Splitrock I am shocked that no one has exclaimed the magnificent power of cryptos yet lol :)

It has a 15 washer/15 dryer laundromat on site, as well as a 3 bay coin op car wash with 6 vacuums.

Just spent a decent amount of coin doing a make ready during a vacancy.  

Depending on your market and ease of instillation, run the numbers as both coin-op in the basement or individual hook-ups (assumes you'll get more rent).Your CoC ROI is pretty bad at 5% (after reno).

I am looking for a payment system for my laundry system to avoid the administration of and money-kept-in-physical-coin-form risk of coin operated laundry machines.  

The Landlord opens himself up to litigation if he lets the wrong person in or the family decides to fight over who was supposed to get Dad's rare coin collection or mom's $5,000 engagement ring.You also don't want to let someone in that fails to remove everything.