KO Appraisal
Commercial service

Commercial Tax Appeals

Valuation evidence to challenge a commercial assessment before a county assessment appeals board.

What makes this assignment different Income-producing property is assessed on income, so the appeal is won or lost on the income approach: actual rent roll, market vacancy, and a capitalization rate the board will accept.

Who orders this appraisal

  • Commercial owners
  • Asset managers
  • Property tax consultants
  • Attorneys

What the engagement covers

  • Assessment review support
  • Comparable sales analysis
  • Income approach documentation
  • Expert witness testimony

The rules that govern it

Cal. Rev. & Tax. Code §1603: the filing window, and it is strict, The regular appeal period runs July 2 to September 15 in counties where the assessor sends every assessee a value notice by August 1 under §619. Where the county does not, the period extends to November 30. San Diego County has published a July 2 to November 30 window. Confirm the current date with the clerk of the board before relying on it, because a deadline falling on a weekend or holiday rolls. Miss it and you generally wait a year.

Cal. Rev. & Tax. Code §167, and why it does not help commercial owners, This section creates a rebuttable presumption affecting the burden of proof in favour of the taxpayer, but only for an owner-occupied single-family dwelling that is the owner’s principal residence and qualifies for the homeowners’ exemption, and in escape assessment appeals. It does not apply to commercial property. On a commercial appeal the burden is yours, which is exactly why the evidence has to be strong.

Proposition 8 decline in value versus Proposition 13 base year, Two different challenges. A Proposition 13 challenge disputes the base year value set when the property changed hands. A Proposition 8 challenge argues that current market value has fallen below the factored base year value, producing a temporary reduction reviewed annually and restorable as values recover, never above the factored base year value. Most commercial appeals are Proposition 8 appeals.

The lien date is the valuation date, The board is asking what the property was worth on the January 1 lien date for the year under appeal. An appraisal with today’s effective date does not answer that question, and a report that capitalises current income rather than income as of the lien date will not survive the assessor’s review.

What makes a cap rate defensible before a board, Extraction from verified comparable sales, as of the lien date, with the income behind each sale verified rather than assumed. A rate taken from a published survey where real comparables existed invites the assessor to produce their own survey, and the board is then choosing between two assertions rather than weighing evidence.

How it works

  1. Confirm the filing window with the clerk of the assessment appeals board for the county: the statutory rule turns on whether the assessor sends §619 notices, and dates roll off weekends.
  2. Obtain the assessor’s record and check it for factual error first. Overstated square footage or improvements that do not exist are the cleanest wins and need no valuation argument.
  3. Establish the correct valuation date: the January 1 lien date for the year under appeal.
  4. Reconstruct income and expenses as of the lien date, including a reserve for replacement and a reassessed property tax figure where relevant.
  5. Extract capitalisation rates from verified comparable sales near the lien date, not from survey data.
  6. Prepare the report for the board as the audience. It must be followable by someone who is not an appraiser.

What you receive

Appraisal prepared as appeal evidence, with testimony available. Standard turnaround is 1–3 weeks. Rush appraisals available for urgent deadlines.

AppraiserKevin O'Brien, MAI, SRA
LicenseCA Certified General Real Estate Appraiser #3005065
StandardsUSPAP compliant
Turnaround1–3 weeks standard; rush available
TestimonyDeposition and expert witness testimony available

Common questions

Who has the burden of proof in a commercial assessment appeal?
You do. The presumption in Revenue and Taxation Code §167 that shifts the burden to the assessor applies to owner-occupied single-family dwellings that qualify for the homeowners’ exemption, and to escape assessments, not to commercial property. On a commercial appeal you are asking the board to prefer your evidence to the assessor’s, so the quality of the support is what decides it.
When can I file a commercial property tax appeal in California?
The regular period opens July 2. It closes September 15 in counties whose assessor sends every assessee a value notice by August 1, and November 30 in counties that do not. San Diego County has published a July 2 to November 30 window. Confirm the current year’s date with the clerk of the board, since a deadline falling on a weekend or holiday rolls to the next business day.
Will an appraisal guarantee a reduction?
No. It is evidence, and the board decides. What a well-supported appraisal does is give the board something it can rely on. A value as of the correct lien date, built on verified data, with reasoning it can follow. Appeals fail more often on the wrong valuation date or unverified income than on the conclusion itself.
Is it worth appealing?
It is arithmetic. Compare the likely tax saving, over the years a Proposition 8 reduction would realistically apply, against the cost of supporting the appeal. On a substantial commercial property the saving usually justifies proper evidence; on a marginal case it may not.
Can the assessment go up if I appeal?
A board reviews the value and is not bound to your figure, so it can determine a value higher than the assessor’s. In practice this is uncommon, but it is a real reason to establish that you have a genuine case before filing rather than appealing speculatively.
By location

Commercial Tax Appeals across San Diego County

Comparable selection and market evidence differ by submarket. These pages cover what changes locally for this assignment.

Next step

Tell me about the property.

Most assignments start with a short call, property type, the purpose of the appraisal, and the deadline you are working against. You get a fixed quote before any engagement, never contingent on the value reached.

Typical commercial fees range $2,000–$4,000. Residential and simpler assignments quote lower. Every engagement is quoted in advance, so the figure is known before work begins.