N.Y. Vill. Law § 3-303

§ 3-303 Additional village justices in certain villages. At least one\nhundred fifty days prior to any village general election and subject to\na permissive referendum, as provided by article nine of this title, the\nboard of trustees of the following villages may adopt a resolution\ndetermining that such village shall have three village justices with the\nthird village justice to be elected by the electors at the next village\ngeneral election to begin serving a term of office beginning at the\nstart of the official year next succeeding such village general\nelection:\n The village of Spring Valley in Rockland county.\n