Advantax, founded in 1994, is one of the leading firms in property tax consulting, offering a comprehensive range of services. Its property consulting services include revaluation analysis, expansion planning, obsolescence studies, site selection analysis and litigation support. It also offers data preparation, compliance processing, real and personal property management, payment processing and analysis and budgeting. Its additional services include appraisal, valuation and property tax compliance services. The company has clients in various industries, including Kraft, Tyson, McDonald s, Saint-Gobain, Marconi, EDS and BellSouth. Advantax is based in St. Charles, Ill.