NY Real Prop Tax L § 1200 (2021)
2021 New York Laws RPT - Real Property Tax Article 12 - State Equalization Title 1 - State Equalization Rates 1200 - Studies for Establishing State Equalization Rates.

§ 1200. Studies for establishing state equalization rates. 1. At least   once  in  every  three  years  in all cities and towns, the commissioner   shall, as part of its  procedure  for  establishing  state  equalization   rates  pursuant  to  this  article,  sample  the ratio of assessments to   market values for each major type of taxable real  property  as  of  the   same  date  or  period  of time. In each special assessing unit and each   approved assessing unit which has  adopted  the  provisions  of  section   nineteen  hundred  three  of  this  chapter  the commissioner shall also   sample the ratio of assessments to market values for each class and each   class in each portion as those terms are  defined  in  section  eighteen   hundred  two  and  section  nineteen  hundred  one of this chapter. Upon   completion of each such study, the results thereof shall be filed in the   office  of  the  commissioner  as  a  public  record,  but  until   such   completion,  the  study  shall  not  be a public record and shall not be   subject to the provisions of article six of the public officers law.2. A study conducted pursuant to subdivision one of this section shall   be known as a "market value survey". Each market value survey  shall  be   identified by the year containing the date as of which the full value of   taxable  real  property  is  estimated for purposes of that market value   survey, which date shall be known as the "valuation date" of that market   value survey.3. A market value survey conducted pursuant to this section  shall  be   based  upon  any  data  collected  or  maintained  by  the commissioner,   including sales data, data made available by local assessors  concerning   physical  characteristics  of  parcels, the value of such parcels or the   aggregate full value of some or all of the parcels within the  assessing   unit.  The  commissioner  shall  promulgate  rules  to  provide that the   quality and accuracy of the data concerning physical characteristics  of   the  parcels  and  any  other  data  provided  by  local  assessors  are   sufficient for use in the conduct of the market value survey. Where  the   commissioner determines that the local data is of sufficient quality and   accuracy  for  use  in the market value survey, the assessing unit shall   provide such data to the commissioner at the commissioner's request.4. The commissioner shall prepare and submit a report to the governor,   the president pro tem of the senate and  the  speaker  of  the  assembly   concerning  the  quality of local assessment practices found through the   market value survey. Such  report  shall  be  presented  no  later  than   December  thirty-first  of the second year following the year in which a   new market value survey is first utilized in the establishment of  state   equalization  rates  pursuant  to  section  twelve  hundred  two of this   article.5. For purposes of this article, and any  procedure  required  herein,   the commissioner may determine the aggregate full value of any assessing   unit,  portion of an assessing unit or class within an assessing unit in   determining the ratio of assessments to market value in the  calculation   of any rate or ratio.