ยง  1536-a.  County  appraisal  service. 1. Types of property. Upon the
  adoption of a local law by a county providing therefor, the  county  may
  provide  to the cities, towns and villages therein to which this article
  applies, upon written request of the chief executive officer or assessor
  of such cities, towns and villages, appraisals of real property.
2. County appraisal personnel. The county shall employ appraisers  and
  other  technical personnel to make the appraisals of such properties and
  provide expert testimony thereto. No person shall  be  employed  by  the
  county  and  assigned  professional appraisal duties which relate to the
  valuation of real property for  purposes  of  determining  market  value
  unless  he  or she meets the minimum qualification standards established
  by the commissioner. Such appraisal personnel shall  attend  courses  of
  training  and  education  prescribed  by  the  commissioner  under  this
  article.
3. County appraisal reports.  Upon completion of an appraisal of  real
  property pursuant to this section, the county director shall file a copy
  of  the  appraisal  with  the  assessor of the city or town in which the
  property is located, and where such property is located in a  village  a
  copy  shall  be  filed  with  the  assessor of the village. The original
  appraisal report shall be filed in the office of the  director  of  real
  property tax services and shall be a public record after the exchange of
  appraisals pursuant to court rules or regulations.
4.  Apportionment  of  expense  of  county  appraisals. The expense of
  making appraisals under this section  may  be  charged  to  the  several
  cities,  towns and villages in the county in accordance with the cost of
  the appraisals of properties located in such cities, towns  or  villages
  respectively  and  such charges to the cities, towns and villages in the
  county shall be deemed to be a municipal purpose.
5. Appraisals not binding on assessors. Appraisals furnished  pursuant
  to this section shall be considered by the assessor of the city, town or
  village in determining market value but shall not be binding upon him or
  her.
Structure New York Laws
Article 15-A - County and State Assessment Services
Title 1 - County Services to Cities and Towns
1530 - County Real Property Tax Service Agency; Director.
1532 - Powers and Duties of Director of Real Property Tax Services.
1536 - County Advisory Appraisal Service.
1536-A - County Appraisal Service.