Just prior to the 4 o'clock hour, Sussex EOC alerted Station 85 for a fire alarm activation at Luther Towers in Milton. Deputy Chief Millman responded in 85-8, arriving shortly after dispatch to find a three story multi family with evacuation in progress and an audible alarm. Engine 85-4 arrived next and investigated an alarm activation on the first and third floor. Ladder 85 arrived and assisted the crew from Engine 4. Crews found a faulty smoke detector and Command placed the situation under control. Units responding 85-8, Engines 4, 5, Ladder 85, Tanker 85, A-85, DSFP, MPD.