O’Connor is one of the top property tax consulting firms in the United States. O’Connor’s group of experts possess the resources and unparalleled market expertise in the areas of property tax, cost segregation, and commercial and residential real estate appraisals. The firm was established in 1974 and employs in excess of 550 experts around the world. We facilitate more lawsuits and settle more binding arbitration cases than any other tax consulting firm in the country. O’Connor provides its customers with property tax protest values ranging from $5,000 to $100 million.