La. Stat. tit. 9 § 5804
Any municipal corporation owning alienable immovable property may prevent the running of prescription acquirendi causa against it in favor of any third possessor, by recording a notice with the clerk of court of the parish where the property is situated, or with the register of conveyances in the Parish of Orleans insofar as property in that parish is concerned. This notice shall contain a description of the property and a declaration that it is public property belonging to the municipality and the recording shall suspend the running of prescription during the time the ownership of the property shall remain vested in the name of the municipality.
The recordation of the written act by which a municipal corporation shall acquire alienable immovable property likewise shall be deemed sufficient notice in order to suspend the term of prescription.
La. R.S. § 9:5804