The Sullivan County Property Assessor’s Office Is Extending The Deadline For Informal Appeal Hearings Through This Week. Residents Are Still Attempting To Schedule Appointments Following Significant Property Value Increases. The County’s Average Property Value Increased By 64 Percent. Appointments Can Be Made By Calling Or Visiting The Office During Regular Business Hours. Those Seeking To Appeal Should Bring Documentation Such As Recent Appraisals Or Comparable Sales.