CSSI Services is an engineering-based consulting firm providing specialty tax services for commercial buildings and innovation-driven businesses. Founded in 2003, CSSI has completed more than 65,000 studies nationwide. Core services include Cost Segregation, R&D Tax Credits, and 179D Deductions, grounded in engineering analysis and tax law review. CSSI works with real estate investors, businesses, and the CPAs and tax advisors alongside them.