La. Stat. tit. 33 § 3624
The sum assessed against the real estate shall be due within thirty days after the completion of the work and its acceptance by the governing authority, and, if not paid by that time, the governing authority may proceed by suit against the owners and the real estate to collect the delinquent assessment. The said municipality or village shall have a special privilege on the abutting property to secure the payment of the sum assessed against it, with six per cent interest per annum from the date due, until paid. The governing authority, instead of enforcing the assessment as above provided, may upon the payment in cash by the property owner of twenty per cent of the amount due by him authorize the mayor to sign and issue certificates showing the amounts respectively due by the persons and properties on the sidewalks or curbing paved or improved, which shall be payable in one, two, three, four, and five years, (or sooner, at the option of the owner of the property), with maximum rate of six per cent interest per annum, interest payable annually, which certificates duly paraphed by the clerk of the municipality or village as being secured by the special privilege and recorded in the mortgage office of the parish shall constitute a privilege on the property, and may be transferred, carrying the lien and privilege of the transferee at their face value, to the contractor in payment of the work on sidewalk, or curbing, or portions thereof. Where the work is done by the municipality or village, as provided in R.S. 33:3622, the certificate may be transferred to other persons, and shall also enjoy the lien and privilege.
La. R.S. § 33:3624