O'Brien Law, P.C. Share: ATTORNEYS O'Brien Law, P.C. 462 Sagamore Ave East Williston , NY 11596 (516) 253-1850 About Rep Info Map About A full service civil and commercial law firm specializing in zoning and land use. Whom to Contact Kevin O'Brien What's Nearby? Distance: 5 10 15 20 25 50 mi.