Can I appeal property taxes on a San Francisco condo?

Yes. Condo owners have the same appeal rights as single-family owners, and file the same Prop 8 decline-in-value appeal with the Assessment Appeals Board between July 2 and September 15. The key difference is that your comparable sales must be other condos.

Why are SF condos more likely to be over-assessed than houses?

Condo values diverged downward from single-family values, many downtown units were purchased near market peaks setting high base year values, and Prop 13 assessments rise up to 2% a year without falling automatically when the market does. The gap only closes if the owner files a Prop 8 appeal.

What are the best comparable sales for a condo appeal?

Recent arms-length sales in your own building or complex. They hold location, HOA, construction, and amenities constant, leaving only floor, view, and condition to adjust for — cleaner evidence than a single-family owner can usually obtain.

Can I use this spring's sales for my condo appeal?

Often not. Comparables must be near the January 1 lien date, and under Revenue & Taxation Code §402.5 a sale more than 90 days after the lien date cannot be used. In a declining market that excludes many of the lowest recent sales, so build your case working backward from January 1.

Do HOA dues and special assessments affect my assessed value?

They affect market value, which is what your appeal is about. A documented special assessment, unusually high dues, or HOA litigation that limits financing all suppress what a unit can sell for — worth submitting alongside your comparable sales.

Why San Francisco Condos Are the Most Over-Assessed Homes in the City

If you own a San Francisco condo, you are statistically the most likely homeowner in the city to be paying tax on a value your unit couldn't sell for. The reason is structural, and it means condo owners have both the strongest cases and the hardest evidence problem.

Two markets, one assessment roll

San Francisco's condo market and its single-family market stopped moving together. Detached homes in the west and south of the city held up comparatively well; condos — especially downtown, SoMa, Mission Bay, and Rincon Hill high-rises — did not. Layer on rising HOA dues, insurance costs, and special assessments, and the same nominal price buys a materially worse asset than it did at purchase.

Assessments don't track any of that on their own. Under Prop 13, your assessed value ratchets up as much as 2% a year and does not fall automatically when the market does. A Prop 8 appeal is the mechanism that forces the comparison — and it only happens if you ask. (Why assessments stay high while values fall.)

So the gap that opened between condo market values and condo assessed values is, for most owners, still sitting on the roll.

Why condo owners specifically get stuck

Purchases clustered at the top. Many downtown units transacted in the peak years, which set high base year values that have been factored upward every year since — from a starting point the market has never returned to.

New construction set a base at a developer's price. If you bought from a developer, your base year value reflects a first-sale premium that doesn't survive resale.

Automated estimates mislead in both directions. Public valuation models handle detached homes reasonably and condos badly — they can't see floor, exposure, view, layout, or which stack a unit is in. Owners talk themselves out of appealing because a website shows a number that isn't real.

The comp problem — and why it's actually an advantage

The rule condo owners break most often: comparing to single-family homes. A condo must be compared to other condos, and this is where selection gets genuinely technical. Within one building, two units of identical square footage can differ 20% or more in value based on:

Floor and exposure — a high floor with a view versus a low floor facing a light well
View type and whether it's protected by zoning or an adjacent development
Parking — deeded space, valet, or none, which in SF is a large dollar amount
Layout efficiency — a true two-bedroom versus a den marketed as one
HOA dues and any special assessment, which capitalize directly into value
Rental restrictions or litigation affecting the HOA, which suppress lender appetite and price

That complexity is why condo owners are over-assessed. It's also why they win: sales inside your own building or complex are the strongest comparable evidence available in residential appeals. Same location, same HOA, same construction, same amenities — the only variables left are floor, view, and condition, and those are adjustments a board can follow. A single-family owner never gets evidence that clean.

If your building has recent arms-length sales, lead with them. Then adjust for floor and view explicitly rather than hoping nobody asks.

What to watch on the valuation date

Comps must sit near the January 1 lien date, and under §402.5 a sale dated more than 90 days after the lien date can't be used at all. In a falling market this cuts the wrong way: the most recent sales — the lowest ones, the ones that best show the decline — are often the ones you're barred from using. Owners lose otherwise-strong appeals by building a case on spring and summer sales that are inadmissible for a January 1 valuation. Work backward from the lien date, not forward from today.

Two more things worth including if they apply: a special assessment your HOA has levied (documented, with the dollar amount and scope of work), and any litigation or FHA/lender ineligibility affecting the building — both are real, documentable drags on market value that comparable sales alone may not capture.

CompFinder was built for exactly this selection problem: it pulls condo sales near the lien date and screens them on type, size, floor, view, and parking, so you're comparing units to comparable units rather than to the building's best sale.

Filing

San Francisco's regular filing period is July 2 – September 15, with a $120 fee; the free informal review window closed March 31. (Which door to use.) If your unit is your principal residence with the homeowners' exemption, the burden of proof at the hearing runs in your favor.

Start with the step-by-step SF appeal guide, and check your county's exact date — in SF, September 15 arrives sooner than most people assume.