As always double check with your trustee. As long as your IRA can afford the payments and you can structure a non recourse contract with the seller, ie. no personal liability/no problem. The property itself is the recourse and if the IRA can't pay the seller gets the property back by mutual consent. If the seller has to sue, he will have to sue the IRA and not you personally.
Some folks take this a step further and structure the contract with the seller that allows the IRA to rent or lease option the property to a third party. This builds cash flow into the deal that can help both the IRA and the seller!!!
Always, always, always get your trustees approval and bounce the whole deal off of them prior to proceeding. Seek competent legal advice when in doubt.
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Marc