Section 67.456 - Neighborhood improvement districts - duration of bond maturity - maintenance provisions required, when - assessed costs on divided property recalculated, how, restrictions1. The average maturity of bonds or notes issued under the neighborhood improvement district act after August 28, 2004, shall not exceed one hundred twenty percent of the average economic life of the improvements for which the bonds or notes are issued.2. Any improvement for which a petition is filed or an election is held under section 67.457 after August 28, 2004, including improvements to or located on property owned by a city or county, shall include provisions for maintenance of the project during the term of the bonds or notes.3. In the event that, after August 28, 2004, any parcel of property within the neighborhood improvement district is divided into more than one parcel of property after the final costs of the improvement are assessed, all unpaid final costs of the improvement assessed to the original parcel that was divided shall be recalculated and reassessed proportionally to each of the parcels resulting from the division of the original parcel, based on the assessed valuation of each resulting parcel. No parcel of property which has had the assessment against it paid in full by the property owner shall be reassessed under this section. No parcel of property shall have the initial assessment against it changed, except for any changes for special, supplemental, or additional assessments authorized under the state neighborhood improvement district act.