Argued May 5, 1981 Decided June 16, 1981 Appeal from the Appellate Division of the Supreme Court in the Fourth Judicial Department, EDWARD F. McLAUGHLIN, J. John C. Setright for appellants. James F. Dwyer for Village Board of Village of Fayetteville, respondent. Chief Judge COOKE. Dispositive on this appeal is the well-established rule that a landowner who seeks a use variance must demonstrate factually, by dollars and cents proof, an inability to realize a reasonable return under existing permissible