Prop 8 Decline-in-Value Appeals for California Commercial Property

The lesser-of test in Section 51

Revenue and Taxation Code §51(a) sets the rule. For each lien date after the base year, the taxable value of real property is the lesser of its factored base year value (FBYV) or its full cash value as defined in §110, taking into account reductions caused by damage, destruction, depreciation, obsolescence, removal of property or other factors causing a decline in value. The lien date is January 1. A Prop 8 claim therefore asks one question: what would this property have sold for, in its current condition and leasing position, on January 1 of the year under appeal?

Two details matter for commercial owners. First, the comparison is made on the appraisal unit that buyers and sellers commonly trade as a unit (§51(e)), which for most commercial property means land and improvements together. A shortfall in the building cannot be offset against land that the assessor thinks has gained value, or the reverse, unless the market trades them separately. Second, a Prop 8 value is a one-year value. It does not replace the base year. The FBYV keeps compounding in the background, and the enrolled value snaps back toward it as the market improves.

Taxable value on the lien date = lesser of (Factored base year value, Full cash value on January 1)

Informal review first, formal application in parallel

Most county assessors accept an informal decline-in-value review request during the same window as formal appeals. In Los Angeles County, the Assessor's decline-in-value review and the Assessment Appeals Board filing period both run from July 2 to November 30. The informal route costs nothing and resolves many straightforward cases, but it is not an appeal. If the Assessor denies the request or offers a partial reduction after the filing period closes, the owner has no remaining right to a hearing for that year.

That is why experienced consultants file the formal Application for Changed Assessment with the county board alongside the informal request, especially for large or complicated assets. The application can be withdrawn if the informal review produces an acceptable value. In Los Angeles County the filing fee is $46 per application, and an agent other than a California attorney retained by the owner must include the owner's written authorization with each application at the time of filing.

Statewide, Revenue and Taxation Code §1603 sets the regular filing period. It opens July 2 and closes September 15 in counties where the assessor mails assessment notices to all taxpayers by August 1, and November 30 in counties that do not. Check each county's published window every year rather than assuming last year's date.

Building the value for an income property

For office, retail, industrial and multifamily property, the income approach usually carries the case. Boards want the same discipline they would expect from any appraisal: market rent rather than contract rent, a stabilized vacancy allowance, normalized operating expenses, reserves, and a capitalization rate drawn from the market. Because the property tax line is what is being contested, use a loaded cap rate that adds the effective tax rate to the base rate and leave taxes out of the expense deduction.

The example below is Lakewood Plaza East, a 64,000 sq ft multi-tenant office building in the South Bay purchased in 2019. Its FBYV on the January 1, 2026 roll is $23,450,000. Submarket asking rents have fallen, concessions have grown and the building is 74% leased. The analysis values the property stabilized at market vacancy, which is the stronger position in front of a board than capitalizing actual occupancy into perpetuity.

The indicated value of about $18,510,000 sits $4,940,000 (21%) below the FBYV. At a 1.18% effective tax rate, that is roughly $58,290 of tax for the 2026-27 year. An additional below-the-line deduction for lease-up costs on the space above market vacancy would push the value lower, provided the owner can document the leasing plan.

Evidence the board will ask for

Assessment Appeals Boards hear many income property cases each session and tend to test the same points. Prepare for them before the hearing rather than at the table.

• A rent roll as of January 1 and leases signed in the 12 to 18 months around the lien date, with free rent and tenant improvement packages stated so effective rent can be calculated.
• Operating statements for the prior three years, with debt service, depreciation, income taxes and capital items removed and explained.
• Lease comparables and sales from the submarket close to January 1. Sales well after the lien date carry less weight, and the board may exclude data the owner could not have known on the valuation date.
• Cap rate support from closed transactions and published investor surveys, with the effective tax rate shown separately so the load is transparent.
• A short narrative reconciling the income approach with the sales comparison approach, and an explanation of any gap between them.
• The assessor's own valuation, requested in advance, so the presentation can address the specific assumptions the county used.

Timing: the two-year rule and annual refiling

Under Revenue and Taxation Code §1604(c), if the board does not make a final determination within two years of a timely filed application, the applicant's opinion of value stated on the application is enrolled, unless the applicant agrees in writing or on the record to extend the time. Boards with heavy calendars routinely ask applicants to sign waivers. Signing is common and often sensible, but it should be a decision rather than a reflex, and the opinion of value on the application should always be a number you can support.

A Prop 8 appeal covers one lien date. If the market is still soft the following January, a new application is needed for the next year, and pending applications for the same parcel are usually heard together. Track each roll year separately: a missed year cannot be recovered by winning the year before or after it.

Recapture: what happens when the market recovers

Once a property is enrolled at a Prop 8 value, the assessor reviews it each year until market value again exceeds the FBYV. The increase back toward the FBYV is not limited to 2% a year. A building reduced to $18.5 million in 2026 could be enrolled at $21.5 million in 2027 if the market supports it, an increase of more than 16% in one year, and that is lawful as long as the enrolled value does not exceed the FBYV.

Asset managers should budget for that recapture rather than treating a Prop 8 reduction as permanent. The same logic works in the owner's favor in a falling market: a reduction that the assessor carries forward from the prior year is still reviewed annually, and the owner can file again if the assessor's restored value moves ahead of the market.

ATALI ELECTRIC tracks FBYV, the enrolled value and the indicated market value for each California parcel by roll year, flags parcels where the gap justifies a filing, and builds the income and sales evidence for the application. The Deadline Tracker holds each county's July 2 to September 15 or November 30 window, and the consultant or attorney who files the application decides the opinion of value and presents the case.