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San Diego County · La MesaLa Mesa property taxes. A flat year. Recent buyers, look closely.
The typical home in La Mesa, in San Diego County, was worth about $874,000 in January 2026, 2.5% less than a year earlier. Assessed values can still rise up to 2% a year, so a flat market can quietly push an assessment above what a home would sell for.
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What La Mesa home values did
La Mesa values were essentially flat into January 2026, sitting 2.5% under the February 2025 high. Across San Diego County, the typical value was 2.3% below its own peak at the same point, so La Mesa saw about the same drop as the county as a whole.
Values have recovered 1.3% since January, through August 2026. That doesn't weaken a 2026 claim, which is judged as of January 1, 2026, but it may narrow any gap on the 2027 roll.
| Measure | Value |
|---|---|
| January 2026 (2026 lien date month) | $874,000 |
| Peak since 2021 | $896,000 in February 2025 |
| January 2026 vs. peak | -2.5% |
| January 2026 vs. January 2025 | -2.5% |
| Latest (August 2026) | $885,000 |
Which La Mesa owners may be over-assessed
Under Prop 13, your assessment starts at your purchase price and can rise up to 2% a year. Under Prop 8, it must drop to market value whenever market value as of January 1 is lower. The table compares a typical purchase in each year with the January 2026 typical value of $874,000.
| Bought in | Typical price that year | Rough 2026 assessment | vs. January 2026 value |
|---|---|---|---|
| 2021 | $709,000 | $782,000 | Below market |
| 2022 | $812,000 | $878,000 | Close to market |
| 2023 | $815,000 | $864,000 | Below market |
| 2024 | $886,000 | $922,000 | Possibly over-assessed by about $48,000 |
| 2025 | $881,000 | $899,000 | Possibly over-assessed by about $25,000 |
The buyers most likely to be over-assessed are those who bought in 2024 and 2025. A typical 2024 purchase would carry a 2026 assessment of roughly $922,000 after the 2% annual increases, about $48,000 more than the January 2026 typical value. At California's 1% base tax rate, that's on the order of $480 a year before local voter-approved add-ons.
This is an illustration built on citywide typical values, not an estimate of your home. Your assessment notice shows your actual assessed value, and some assessors lower values on their own in a falling market, so check it first. If you do appeal, your evidence has to show your home's market value.
San Diego County deadlines
- 2026 regular filing period: July 2 through November 30, 2026. If you think the 2026 value is too high, this is the window.
- Informal review: the San Diego County Assessor may review a decline-in-value request informally. File the formal application anyway if the deadline is close; an informal review doesn't extend it.
- Supplemental or escape assessments: these have their own deadline, generally 60 days from the notice date. Check the notice.
Where La Mesa owners file
La Mesa assessments are set by the San Diego County Assessor. Formal appeals go to the county's assessment appeals board, not to the city.
| Form | BOE-305-AH, the state Assessment Appeal Application |
|---|---|
| Filing deadline | November 30 (regular window) |
| Where to file | Clerk of the Assessment Appeals Board, 1600 Pacific Hwy Rm 402, San Diego, CA 92101 |
| Filing fee | No fee listed by the county |
| Appeals office | sandiegocounty.gov |
| Assessor | arcc.sandiegocounty.gov · 619-236-3771 |
Confirm the current form, fee and address with the county before you file. The San Diego County guide lists step-by-step instructions and official links.
Building a La Mesa case
A citywide index shows the trend. Your appeal needs your house. Look for sales of similar homes in La Mesa that closed near January 1, 2026. The BOE treats comparable sales as the strongest evidence for a home, and the appeals board can't consider sales more than 90 days after the valuation date. Match living area, age, condition, lot and location as closely as you can, and write down every difference you can't adjust for.
La Mesa sits in the San Diego-Chula Vista-Carlsbad metro, but neighborhood differences matter more than metro trends. A sale across town can be a weaker comparison than one a few streets away.
A Vulorean report pulls comparable sales and a January 1 value opinion into one document you can file with. Eligible self-file reports are free during launch, with no payment card required. Review every comparison before you use it; you know your home's condition better than any dataset.
Check your La Mesa property for free
Start with your address. Eligible self-file reports are free during launch; an account and available report allowance are required. County filing fees are separate.
Start my free property check →Home values: Zillow Home Value Index (ZHVI), all homes, mid-tier, smoothed and seasonally adjusted, through August 2026, from Zillow Research. Purchase-year rows use each year's average typical value and assume the maximum 2% annual increase. Deadlines: California BOE county filing periods. Vulorean is an independent service, not a government office.