N.Y. RPT Law § 738

§ 738. Residential assessment ratio. 1. (a) For the purposes of this\ntitle, sixty days prior to the date for the filing of the tentative\nassessment roll of an assessing unit, the commissioner shall determine\nthe residential assessment ratio for such assessing unit. The\nresidential assessment ratio shall be equal to the level of assessment\nof residential property in the assessing unit as determined in the\nmarket value survey used or to be used to calculate the state\nequalization rate for that assessment roll pursuant to article twelve of\nthis chapter, subject to the provisions of paragraph (b) of this\nsubdivision.\n (b) The commissioner shall increase or decrease the residential\nassessment ratio to account for a change in level of assessment in the\ntotal assessed value of residential real property or, if not available,\nof all taxable real property. For purposes of this section, "change in\nlevel of assessment" has the meaning set forth in section twelve hundred\ntwenty of this chapter except that a change in level of assessment shall\nbe determined with reference only to residential real property if the\nnecessary information is available.\n (c) The residential assessment ratio shall be made available at the\noffice of the county director of real property tax services, the office\nof the county clerk and the office of the assessor or, in a city with a\npopulation of one million or more, the office of the tax commissioner of\nsuch city. Such ratio shall be provided to the office of court\nadministration for distribution to small claims hearing officers.\n 2. For purposes of this section, assessing units participating in a\ncoordinated assessing program pursuant to section five hundred\nseventy-nine of this chapter shall be considered to be a single\nassessing unit.\n