As used in this chapter:
Where, after the creation of a new municipality or school district in a city, or after a consolidated school district shall have been created by the consolidation of a school district in a city and one or more other school districts.
Where, after the boundaries of a municipality or school district in a city shall have been altered so that real estate subject to taxation for municipal or school district purposes, as the case may be, shall have been thereby added to or subtracted from the area of the municipality or school district, 1. There is no completed assessment roll of the municipality or school district as so altered, the average full valuation of the taxable real estate of the municipality or school district shall be determined from the last completed assessment roll or rolls and the four preceding assessment rolls upon which the real estate included in the municipality or school district after such alteration was assessed prior to such alteration for city, town or school district purposes, as the case may be, or 2. There are assessment rolls of the municipality or school district as so altered which have been completed for at least one year but less than five years, the average full valuation of taxable real estate of the municipality or school district shall be determined from the last completed assessment roll or rolls and the four preceding assessment rolls upon which the real estate included in the municipality or school district after such alteration was assessed prior to such alteration for city, town or school district purposes, as the case may be.
For the purpose of contracting indebtedness or for the purpose of preparing debt statements, the assessment rolls referred to in this subdivision shall mean such assessment rolls as completed, verified and filed by the assessors.
N.Y. Local Fin. Law § 2.00