In 1978, California voters passed Proposition 8, a constitutional amendment that allows a temporary reduction in assessed value when real property suffers a decline in value. A decline in value occurs when the current market value of real property is less than the current assessed (taxable) factored base year value as of the lien date, January 1.

Real property may decline in market value from one lien date to the next lien date; however, it will not benefit from a lower assessment unless its market value falls below the current factored base year value.  The decline in value is typically temporary and may be the result of changes in the real estate market, the neighborhood, or the property itself.

A property that has been reassessed under Proposition 8 is then reviewed annually to determine its lien date value. The assessed value of a property with a Proposition 8 value in place may increase each lien date (January 1) by more than the standard two percent maximum allowed for properties assessed under Proposition 13; however, unless there is a change in ownership or new construction, a property’s assessed value can never increase above its factored Proposition 13 base year value after adjusting for the annual increase.

Note that once your property is reassessed to a lower value under Prop 8, it is only temporary for that lien date; and does not permanently reduce your original base year taxable value. Your assessment may go back up to its factored base year value the next lien-date immediately following a Prop 8 reduction.  This will happen if the market value of your property now exceeds its factored base year value.

Request an Informal Assessment Review

(single family dwellings, residential condominiums, townhouses, live-work lofts and cooperative units only)
From January 2 to March 31 of each year, the Assessor will accept requests to review the market value of your property. You must submit your written request either online or in-person at our office, with supporting evidence of your opinion of value. If you were granted a temporary reduction for the preceding year, we will automatically review the assessed value for the next tax year.  A Notification of Assessed Value will be sent to you in July, which will indicate our findings. Online submissions are preferable, but alternately you may send your request to:

San Francisco Assessor-Recorder’s Office
ATTN: Informal Review
1 Dr. Carlton B. Goodlett Place
City Hall, Room 190
San Francisco, CA 94102

Mail-in requests for an informal review must be U.S. postmarked by the March deadline. By Fax: (415) 554-7915 or email: Be sure to keep a copy for your records.

File an Assessment Appeal

(All property types)
If you disagree with the Assessor’s findings, you may file an Assessment Appeal Application with the Assessment Appeals Board (AAB), an independent body established to hear and resolve valuation disputes between the Assessor’s Office and property owners from July 2 through September 15 of each year. A non-refundable filing fee is due at the time of application and a hearing will be scheduled for you by the AAB at a later date. An Assessment Appeal Application and filing fee information may be obtained by contacting the Assessment Appeals Board – Clerk of the Board:

1 Dr. Carlton B. Goodlett Place
City Hall, Room 405
San Francisco, CA 94102
Phone: (415) 554-6778

Market value is the price a property would sell for when it is put up for sale in a competitive and open market.
The Assessor is required to enroll the lesser of your factored base year value (assessed value) or the market value. For example, if the market value of your property (what you could sell your house for) as of January 1st lien date is $500,000 and your assessed value is $600,000, the Assessor would enroll the $500,000 as your taxable value for that year only.

You will need to submit sales information and/or an appraisal performed by a licensed real estate appraiser to support your claim. The sales information or appraisal’s date of valuation should be as close to the January 1st lien date as possible, but no later than March 31st of the year under appeal.

No. The reduction is temporary and only applies to the tax year being appealed. Any reduction to the assessed value is automatically reviewed annually as of the lien date to determine if market conditions indicate that the assessed value should be maintained, lowered, or increased.
Unlike residential condominiums and cooperative units, TICs do not have separate parcel numbers. A review of a single TIC unit is more complex. TIC owners can appeal their property assessed values by filing an Application for Changed Assessment with the Assessment Appeals Board beginning July 2 through September 15 each year.
Property owners will be notified of the results of their informal assessment review in the annual Notice of Assessed Value which will be mailed at the end of July each year.