When property sold or otherwise alienated by the original debtor or his legal successor has been seized and is about to be sold under executory process, a person who has acquired the property subject to the mortgage or privilege thereon and who has not assumed the payment of the indebtedness secured thereby may:
(1) Pay the balance due on the indebtedness, in principal, interest, attorney's fees, and costs;
(2) Arrest the seizure and sale on any of the grounds mentioned in Article 2751, or on the ground that the mortgage or privilege was not recorded, or that the inscription of the recordation thereof had perempted; or,
(3) Intervene in the executory proceeding to assert any claim which he has to the enhanced value of the property due to improvements placed on the property by him, or by any prior third possessor through whom he claims ownership of the property. This intervention shall be a summary proceeding initiated by a petition complying with Article 891.