Assessor

The Los Angeles County CA Assessor is responsible for identifying taxable property, maintaining assessment records, and determining assessed values for real estate and business property throughout the county. This guide explains how to search for a parcel, understand assessed land and improvement values, correct property characteristics, handle ownership changes, review new construction assessments, claim available exemptions, request a decline-in-value review, and contact the appropriate Assessor office.

Start With the Los Angeles County Assessor Property Search

Most property-related questions begin with the Assessor’s property records. Before calling an office or submitting a form, use the official Los Angeles County Assessor property search to locate the parcel and review the available assessment information.

A property record may include an Assessor Identification Number, commonly called an AIN or parcel number, along with the situs address, legal description information, assessed land value, assessed improvement value, property characteristics, and other details used for assessment purposes. The information available online can help homeowners, prospective buyers, real estate professionals, estate representatives, and business owners identify the correct property before requesting assistance.

Search by the most accurate information available

An exact parcel number generally produces the most precise result because street addresses can be formatted in different ways. If the AIN is unavailable, start with the property address and check that the displayed parcel matches the location you intended to research.

Pay close attention to the following details:

The street number, street name, unit number, and ZIP Code
The Assessor Identification Number assigned to the parcel
The listed land and improvement values
The property type and recorded use
Building characteristics, such as square footage or year built
Any recent assessment activity associated with ownership or construction

A single street address can sometimes involve more than one parcel. Condominiums, commercial developments, vacant lots, combined parcels, and properties with separate ownership interests may require additional attention. Confirm the AIN before relying on a record or submitting a request.

Know what the online record does not prove

The Assessor’s records are maintained for property assessment purposes. They should not automatically be treated as a title report, boundary survey, building permit approval, zoning determination, or guarantee of legal ownership. California law also restricts the online publication of identifying information such as a homeowner’s name without the owner’s written permission.

When ownership documents are needed, a recorded deed or other real estate record may have to be obtained through the appropriate county recording office. When exact lot lines are in dispute, a property owner may need to review recorded maps and consult a qualified surveyor. The Assessor can explain assessment records, but the office does not replace every agency involved with land use, permitting, taxation, or recorded documents.

Understand What the Assessor Actually Does

The Assessor determines taxable values. The office does not set every tax rate, collect property tax payments, or issue every tax bill. Several county departments participate in the property tax system, and each performs a different function.

The Assessor generally:

Locates and identifies taxable real and personal property
Establishes assessed values under California property tax law
Reviews recorded ownership transfers
Reviews permits and completed construction
Processes qualifying property tax exemption claims
Maintains assessment maps and property characteristics
Prepares the assessment roll used by other county departments
Assesses taxable business personal property

After the assessed value is established, other county offices calculate tax amounts, apply tax rates and direct assessments, issue bills, collect payments, and distribute revenue. A question about the value assigned to land or improvements belongs with the Assessor. A question about payment status, penalties, or the amount due generally belongs with the county tax collector.

Read Land, Improvement, and Assessed Values Correctly

The official explanation of real property assessment in Los Angeles County describes how land and improvements are valued under state law. Property tax records normally separate the assessed value into two broad categories:

Land value: The assessed value assigned to the parcel of land.

Improvement value: The assessed value assigned to assessable buildings, structures, fixtures, and other qualifying improvements on the land.

The term “improvements” does not necessarily mean the owner recently remodeled the property. It is an assessment term that can refer to a home, garage, commercial building, apartment structure, or another assessable addition to the land.

Follow the Proposition 13 value framework

California’s Proposition 13 generally limits the basic property tax levy to 1% of assessed value, plus voter-approved bonded indebtedness and direct assessment charges. It also limits annual increases in a property’s assessed value to no more than 2% unless an event such as a change in ownership or qualifying new construction creates a new assessment.

This system is based largely on acquisition value rather than automatically reassessing every property to current market value each year. As a result, two similar neighboring homes can have very different assessed values because they were purchased at different times or experienced different reassessment events.

Do not confuse assessed value with market value

Market value is an estimate of what a property would sell for in an open-market transaction. Assessed value is the value placed on the assessment roll under property tax law. After a purchase, the market value at the time of the transfer may become the new base-year value if no exclusion applies. In later years, the taxable value may increase under the annual inflation adjustment even when the property’s actual market value rises more quickly.

Assessed value can also temporarily decrease when the market value as of January 1 falls below the property’s factored base-year value. This temporary adjustment is commonly called a decline-in-value assessment.

Check Ownership Changes Before Assuming Reassessment Is Final

Recorded transfers are reviewed by the Assessor to determine whether a change in ownership has occurred under state law. The change-in-ownership guidance from the Assessor explains that properties are generally reassessed as of the date of a qualifying ownership change, but exclusions may be available in certain situations.

The Assessor receives recorded deeds and examines the transaction to determine whether reappraisal is required. The effective date is commonly the recording date of the deed. For property inherited from an estate or living trust, however, the relevant date may be the date of the previous owner’s death rather than the later distribution date.

Review exclusions before filing a dispute

Not every transfer produces a reassessment. Examples identified by the Assessor include certain transfers between spouses or registered domestic partners. These may involve transfers resulting from death, divorce, or termination of a domestic partnership. The addition of a joint tenant also may not result in immediate reappraisal in many circumstances.

Other transactions can be more complicated. Transfers involving trusts, legal entities, inherited property, percentage ownership changes, or family transfers may require detailed review. Some exclusions are automatic, while others require a timely claim form and supporting documentation.

Property owners should not rely solely on the wording placed on a deed. The Assessor applies the Revenue and Taxation Code and determines whether the legal and beneficial ownership interests changed. When an exclusion requires a claim, failing to file the proper form can delay processing or cause the property to be reassessed until eligibility is established.

Watch for Proposition 19 requirements

Proposition 19 changed several property tax rules affecting inherited homes, transfers between parents and children, transfers between grandparents and grandchildren, and base-year value transfers for eligible homeowners. The official Proposition 19 information from the Assessor outlines the principal-residence and filing requirements.

For qualifying parent-child or grandparent-grandchild transfers occurring under Proposition 19, the transferred property generally must have been the transferor’s principal residence and must become the recipient’s principal residence within the required period. The recipient must also file for a qualifying Homeowners’ Exemption or Disabled Veterans’ Exemption within the applicable deadline.

Proposition 19 also allows certain homeowners who are at least 55 years old, severely disabled, or victims of a qualifying wildfire or natural disaster to transfer a base-year value to a replacement principal residence located elsewhere in California. The replacement property, transaction dates, value difference, occupancy, and claim filing all affect the calculation.

Prepare for New Construction and Remodeling Reviews

Local permitting agencies send building permit information to the Assessor. The office reviews each project to decide whether the work represents assessable new construction, non-assessable repair, routine maintenance, or a mixture of both. The Assessor’s new construction and remodeling guidance provides examples of work that may affect assessed value.

Recognize projects that commonly add assessed value

Assessable new construction can include substantial additions to land or buildings, alterations that make an improvement substantially equivalent to new, changes in use, and major rehabilitation that extends the economic life of the property.

Common examples include:

Adding a new floor or level
Building a room or garage addition
Increasing the property’s square footage
Converting unfinished attic or basement space into living space
Adding a bathroom where none existed
Constructing an accessory dwelling unit
Adding an elevator
Changing a building from one use to another
Completing a major renovation that leaves little of the original structure

Separate normal repairs from substantial renovation

Routine maintenance and repairs generally do not create a new assessment when they merely preserve the existing property. Examples can include roof replacement, termite repair, dry-rot repair, or replacing worn fixtures with items of similar quality.

A remodel may become assessable when it changes the floor plan, increases the size of the building, upgrades major plumbing or electrical capacity, changes the property’s use, or renovates the structure to a substantially new condition. A kitchen project that only replaces cabinets and countertops with similar materials may be treated differently from a project that removes walls, relocates plumbing, expands the room, and installs substantially upgraded systems.

The permit description alone may not settle the issue. The Assessor can review plans, inspection records, owner statements, construction costs, photographs, and the actual condition of the property. Owners should keep contracts, permits, plans, invoices, and records showing which portions of a project were repairs and which portions added new space or utility.

Expect Supplemental Assessments After Major Taxable Events

A qualifying ownership change or completed new construction can produce a supplemental assessment. This assessment accounts for the difference between the prior assessed value and the new assessed value for the remaining portion of the fiscal year.

The county fiscal year runs from July 1 through June 30. When a reassessable event occurs, the Assessor establishes the new value and sends a notice of assessed value change before the supplemental tax bill is issued. The supplemental bill is separate from the regular annual property tax bill.

Understand why two supplemental bills may arrive

A change in ownership or completion of new construction between January 1 and May 31 can result in two supplemental assessments. One applies to the remainder of the current fiscal year, and the second applies to the following fiscal year. This can surprise new owners who expected only the regular annual bill.

Supplemental bills are generally sent directly to the property owner rather than to a mortgage impound account. A buyer with an escrow account should not assume the lender will automatically receive or pay the supplemental bill. Owners should review mailed notices and communicate with their mortgage servicer when necessary.

Claim the Homeowners’ Exemption for a Principal Residence

A homeowner who owns and occupies a property as a principal residence on January 1 may qualify for a $7,000 reduction in taxable assessed value. The Assessor’s Homeowners’ Exemption instructions explain how to submit the claim.

At an approximate 1% tax rate, the exemption commonly reduces the annual property tax by about $70, although the exact effect can vary because a tax bill may contain other charges. New owners generally receive a claim form, but they should confirm that the form was completed and processed rather than assuming the exemption was applied automatically.

Check eligibility and occupancy carefully

The property must be the claimant’s principal place of residence. A vacation home, rental property, or second residence generally does not qualify as the owner’s principal residence. The exemption may also apply to a supplemental assessment when the previous owner did not claim it.

Supporting documents may be required. When a property is held in a trust, owned by multiple parties, occupied by only one co-owner, or involved in a recent transfer, the Assessor may request information showing ownership and principal-residence status.

Homeowners’ Exemption should not be confused with homestead protection. The exemption reduces taxable assessed value. Homestead protection is a separate civil-law concept involving protection of home equity from certain creditors and does not determine the assessed value.

Correct Building and Land Details in the Assessor Record

Property records can contain outdated or disputed details, including building area, room count, land characteristics, property use, or construction information. Owners who identify a possible error should gather documentation and submit a property data change request rather than assuming the online display will update on its own.

The Assessor provides an official library of assessment forms and filing instructions. The Property Data Change Request, identified as Form ASSR-129, can be used to request corrections to official property characteristics.

Support the request with clear records

Useful documentation may include:

Building permits and final inspection records
Recorded maps or legal descriptions
Construction plans
Photographs showing the disputed feature
Reports identifying square footage or building configuration
Documents showing demolition or removal of an improvement
Prior correspondence from the Assessor

A correction to property characteristics does not always reduce the assessed value. The Assessor must determine whether the record was inaccurate, when the change occurred, and whether the corrected information affects the taxable assessment. A physical characteristic can be wrong while the enrolled value remains correct under the applicable base-year rules.

Challenge an Assessed Value Without Missing a Deadline

Property owners who disagree with an assessment can request an informal review from the Assessor and may also file a formal appeal with the Assessment Appeals Board. These are separate processes. Requesting an informal review does not automatically extend or preserve the deadline for a formal appeal.

The official page for contesting a Los Angeles County assessed value explains the available review and appeal procedures.

Use an informal review for explanations and possible corrections

An informal review can help an owner understand how the Assessor calculated a value following a purchase, ownership transfer, or new construction project. The owner can provide information about the transaction, property condition, comparable sales, construction scope, or claimed exclusion.

For an annual assessment that appears higher than the property’s market value, an owner may request a decline-in-value review. A decline in value occurs when the property’s current market value as of January 1 is below its factored base-year value.

Follow the 2026 decline-in-value filing period

The Assessor began accepting decline-in-value applications for the 2026–2027 tax year on July 2, 2026. The stated filing deadline is November 30, 2026. Owners should submit the application with evidence relevant to the property’s market value as of January 1, 2026, rather than relying only on current asking prices or later market conditions.

Helpful evidence can include recent comparable sales, information about the property’s physical condition, location differences, lot characteristics, and features that distinguish it from nearby properties. Comparable sales should be genuinely similar and should relate to the appropriate valuation date.

Protect formal appeal rights separately

For a supplemental assessment, adjusted supplemental assessment, escaped assessment, or certain other notices, the formal appeal period is generally 60 days from the applicable mailing date stated on the notice or tax bill. For regular annual assessments, the filing period generally runs from July 2 through November 30.

The Assessment Appeals Board acts as an impartial decision-making body in disputes between property owners and the Assessor. Filing with the Board is separate from requesting an Assessor review. Owners should preserve the formal deadline even when Assessor staff are reviewing the matter informally.

Handle Business Property Assessment Requirements

The Assessor also values taxable business personal property. The official business property assessment guidance covers machinery, equipment, fixtures, leasehold improvements, supplies, and other taxable assets used in a trade or business.

Unlike most real property, business personal property is generally reassessed each year because businesses continually acquire, move, sell, or dispose of assets. Business owners may receive a Business Property Statement requiring them to report the cost and acquisition year of property located at each business location.

Pay attention to the annual filing threshold

Businesses with personal property and fixtures costing $100,000 or more are generally required to file a Business Property Statement each year by April 1. The filing obligation can also apply when the Assessor sends a request, even when the business believes its property falls below the threshold.

Business inventory held for sale is generally exempt from property taxation, but equipment used to operate the business is not automatically exempt. Office furniture, computers, manufacturing equipment, restaurant equipment, commercial fixtures, tools, and leasehold improvements may be assessable.

A business should maintain accurate asset schedules showing acquisition dates, original costs, disposals, transfers between locations, and leased equipment. Reporting the current resale value instead of the requested historical cost can lead to an inaccurate assessment.

Choose the Right Assessor Service Before Visiting an Office

Different Assessor units handle ownership, residential valuation, commercial valuation, exemptions, mapping, business property, aircraft, vessels, manufactured homes, and other specialized matters. Preparing the AIN, property address, notice date, form number, and a brief description of the issue can make the inquiry more efficient.

Appointments may be available for in-person or remote service depending on the subject. The Assessor also accepts online inquiries, and the referenced contact information states that general inquiries are typically answered within one to three business days.

Confirm the North District service location

The North District–Sylmar office closed effective March 26, 2026. North District public services and operations were temporarily moved to the Assessor’s downtown headquarters. North District property owners may also use the temporary Castaic Library satellite service on its designated operating days.

Because locations and service arrangements can change, review the official Los Angeles County Assessor office locations before traveling. Some offices have different public hours or line-closing times, and the Beverly Hills Courthouse office follows a shorter weekly schedule than the full-service regional offices.

Los Angeles County Assessor Offices

Main Office
Kenneth Hahn Hall of Administration
500 W. Temple Street, Room 225
Los Angeles, CA 90012
(213) 974-3211
1 (888) 807-2111

North District Office
Kenneth Hahn Hall of Administration
500 W. Temple Street, Room 225
Room 293, Mailing Address
Los Angeles, CA 90012-2770
(818) 833-6000

North District Castaic Library Satellite Site
Castaic Library
27971 Sloan Canyon Road
Castaic, CA 91384
(818) 833-6000

East District Office
1190 Durfee Avenue
South El Monte, CA 91733
(626) 258-6001

South District Office
1401 E. Willow Street
Signal Hill, CA 90755
(562) 256-1701

West Regional Office
6167 Bristol Parkway, Suite 100
Culver City, CA 90230
(310) 665-5300

Beverly Hills Courthouse Office
9355 Burton Way, Suite 400
Beverly Hills, CA 90210
(310) 665-5300

Lancaster Regional Office
251 E. Avenue K-6
Lancaster, CA 93535
(661) 940-6700

Assessment Appeals Board
Kenneth Hahn Hall of Administration, Room B-4
500 W. Temple Street
Los Angeles, CA 90012-2770
(213) 974-1471

Los Angeles County Assessor FAQs

How can I check the status of a misfortune or calamity claim?

Property owners who have already filed a misfortune or calamity claim can check its status through the Los Angeles County Assessor website. The status search accepts either the property’s Assessor Identification Number, also called an AIN or parcel number, or the property address. Enter the same property information used on the original claim to reduce the chance of a mismatched result. If the claim does not appear, verify the AIN and address formatting before submitting a separate inquiry.

Which form should I use to change the mailing address on an assessment record?

Use Form ASSR-451, Change of Mailing Address, to update where assessment notices and related correspondence are sent. The form can be downloaded or submitted electronically through the official Los Angeles County Assessor forms page. Changing an Assessor mailing address does not necessarily update records maintained by other county departments, mortgage companies, homeowner associations, or utilities. Review the form instructions carefully and provide the correct AIN for every parcel affected by the request.

Can a Homeowners’ Exemption application in Spanish be submitted online?

The Assessor’s e-file service does not currently support online submission of the Spanish Homeowners’ Exemption form. A claimant using the Spanish version must download the form and submit it by mail according to the instructions provided with the application. Supporting documents may be required, particularly when ownership, occupancy, a trust, or multiple owners are involved. Filing the English version online remains available for eligible applicants.

Can I schedule an appointment for a specialized assessment issue?

Yes. The Assessor offers Microsoft Teams and in-person appointments for several service areas, including ownership changes, residential or commercial valuation, exemptions, mapping, manufactured homes, aircraft, vessels, major commercial properties, and business personal property. Use the official Assessor appointment scheduling page and select the service category that most closely matches the issue. Prepare the AIN, property address, relevant notice, form number, and supporting documents before the appointment.