Article 594

If the owner should make the extraordinary repairs, he shall have a right to demand of the usufructuary the legal interest on the amount expended for the time that the usufruct lasts.

Should he not make them when they are indispensable for the preservation of the thing, the usufructuary may make them; but he shall have a right to demand of the owner, at the termination of the usufruct, the increase in value which the immovable may have acquired by reason of the repairs. (502a)