Article 726 of the Civil Code stipulates that if the lessor sells the leased house, it shall notify the lessee within a reasonable period before the sale, and the lessee shall have the preemptive right under the same conditions; Except that the house is preempted by the owner or the lessor sells the house to a close relative. After the lessor performs the notification obligation, if the lessee fails to explicitly express the purchase within fifteen days, it shall be deemed that the lessee waives the preemptive right.