The valuation date for a market value base survey, subsequent to the 1983 survey, is January 1, of the year designating the survey. Sample parcels shall be appraised as of the valuation date according to their physical condition and ownership as of the taxable status date of the base year roll.
N.Y. Comp. Codes R. & Regs. Tit. 20 §§ 8186-26.3