An assignment sale refers to the process where a buyer who has already entered into a contract to purchase a property transfers their rights and obligations under that contract to a third party before the transaction is completed. In this sale, the original buyer (assignor) sells their contractual rights to another buyer (assignee) without actually taking possession of the property. Assignment sales are common in pre-construction real estate, where the assignee steps into the shoes of the original buyer, often at a premium price.