La. Stat. tit. 33 § 3724
The municipality may determine the damages to the owners of the lands under the law of eminent domain. The owners of the land may likewise institute in any court of competent jurisdiction their actions to have assessed the damages sustained by them. No action shall be brought by any owner of property affected by the ordinance for damages by reason of the taking of the servitude, unless the action has been brought within twelve months of the final passage of the ordinance establishing the line. This prescription shall not apply to any person under disability whose right to bring action is regulated or governed by any other law of Louisiana.
The measure of damage for the taking of the servitude under the ordinance shall be the difference between the value of the land at the time of the taking, without the servitude, and the value of the land at the time of the taking, subject to the servitude of the municipality. Nothing herein contained shall give any municipality any right, title, or interest to any building or improvement now existing on any land over which the municipality acquires a servitude or to the use or possession of any land within the line so established until the actual acquisition of the land as hereinafter provided.
La. R.S. § 33:3724