1. (a) The base year roll is the assessment roll of the village assessing unit identified by the calendar year following the base year roll of the town or towns.

2. (b) The total estimated market value on the base year roll is determined as follows:

   1. (1) Obtain the estimated market value of the village assessing unit from the survey data used in the computation of the prior year's final State equalization rate of the corresponding town or towns by summing the market values of the appropriate survey units.

   2. (2) Apportion the percent net nonequalization change from the roll immediately preceding the base year roll of the village to the base year roll of the village, as determined from the assessor's report, as follows:

      1. (i) multiply the percent net nonequalization change, expressed in decimal form, by the number of months between the taxable status date of the base year assessment roll of the town and the base year assessment roll of the village;
      2. (ii) divide by 12; and
      3. (iii) add the whole number one to the quotient obtained in subparagraph (ii) of this paragraph to produce the net nonequalization change factor.
   3. (3) The estimated market value of locally assessed property is computed by multiplying the estimated market value for the village obtained in paragraph (1) of this subdivision by the net nonequalization change factor determined in subparagraph (2)(iii) of this subdivision.
3. (c) The estimated market value ratio on the base year roll is determined by dividing the total assessed value of locally assessed properties obtained from the assessor's report for the village assessing unit by the total estimated market value determined in subdivision (b) of this section.

The estimated market value ratio for a non-homestead village assessing unit in Nassau County shall be determined as provided in this section.