If the buyer elects to return the immovable he must also return to the seller the fruits of the immovable from the time a demand for rescission was made. In such a case, the seller must return to the buyer the price with interest from the same time.
If the buyer elects to keep the immovable he must also pay to the seller interest on the supplement from the time a demand for rescission was made.
La. C.C. § 2592