Argued April 30, 1997; Decided June 12, 1997 Appeal from Appellate Division of the Supreme Court, Third Judicial Department, Albany County Dennis C. Vacco, Attorney-General, Albany ( Patrick Barnett-Mulligan, Barbara G. Billet and Peter H. Schiff of counsel), for New York State Office of Mental Health and another, appellants. Stein Schonfeld, Garden City ( Robert L. Schonfeld, Seth P. Stein and Beth Pepper of counsel), for Rehabilitation Support Services, Inc., appellant. Vincent J. McArdle, Jr.