La. Civ. Code art. 2492
Current with operative changes from the 2024 Third Special Legislative Session
If the sale of an immovable has been made with indication of the extent of the premises at the rate of so much per measure, but the seller is unable to deliver the full extent specified in the contract, the price must be proportionately reduced.
If the extent delivered by the seller is greater than that specified in the contract, the buyer must pay to the seller a proportionate supplement of the price. The buyer may recede from the sale when the actual extent of the immovable sold exceeds by more than one twentieth the extent specified in the contract.
La. C.C. § 2492