Although you could prepare the correct legal paperwork, given the history of such lease to own arrangements in Louisiana it is likely worth the money to pay an attorney to prepare the documents. A mistake in the documents could have very serious unintended consequences, such as inadvertently transferring ownership before intended, attempting to enforce illegal lease to own terms which might void the deal, or other similar problems. As you have the terms fully negotiated, it should not take much time for a good real estate attorney to prepare the documentation. The security and piece of mind you will have from knowing that your rights as the seller are protected is worth the small fee for document preparation in this type of situation.
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