Research and tools
Public research for people who file commercial appeals.
County rules, filing playbooks, benchmarks and calculators. Free to use and cite.
National county tax database
55 counties: windows, assessment levels, value standards and boards. CSV export.
| Maricopa County, AZ | 60d |
| Pima County, AZ | 60d |
| Alameda County, CA | fixed |
| Los Angeles County, CA | fixed |
| Orange County, CA | fixed |
County appeal guides
31 step-by-step filing playbooks with forms and evidence rules.
2026 Benchmark Report
Tax burden, CAMA drift, appeal success and the NOI value of a reduction.
Latest from the blog
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- Strategy · August 20, 2026Contingency Fees in Property Tax Consulting: Defining Savings and Staying Compliant
- Benchmarks · July 16, 2026Why CAMA Mass Appraisal Over-Assesses Commercial Property, and How to Show It
- Valuation · July 9, 2026Cap Rate Selection for Property Tax Appeals: Extraction, Band of Investment and Loading
The Ad Valorem Advisor
Bi-weekly notes on county assessment trends, millage rates and commercial appeal strategy.
Stop overpaying commercial property tax on a flawed mass appraisal.
Upload an assessment notice. ATALI ELECTRIC returns a valuation audit and comp analysis in about two minutes.