Eight Months of SB 346: How California Cities Are Using Airbnb Data to Find Unlicensed Hosts at Scale

On August 21, 2026, Los Angeles City Attorney Hydee Feldstein Soto announced a civil lawsuit against four operators running at least 30 residential properties as unauthorized short-term rentals across the city (LA City Attorney). The defendants, identified as Dylan Abekasis, Arie Abekasis, Rajaa Chraibi, and Marcelle Melka, allegedly used expired registration numbers, falsely listed properties as being outside Los Angeles jurisdiction, and advertised unlicensed units on Airbnb, VRBO, and Booking.com. The complaint also alleged post-wildfire price gouging, pushing the action into California consumer protection law territory.

The city had first sent cease-and-desist letters and served subpoenas, which the defendants allegedly ignored (LA City Attorney). It did not revoke a permit. It filed a civil lawsuit.

That choice matters. And it is directly connected to the legal framework California put in place eight months ago.

What SB 346 Actually Does

California Senate Bill 346, the Short-Term Rental Facilitator Act of 2025, was signed by Governor Newsom on October 13, 2025, and took effect January 1, 2026. Authored by Senator Maria Elena Durazo, the law adds Sections 50990 through 50996 to the California Government Code.

The core mechanism is data transparency. Under SB 346, any California city or county that adopts a conforming local ordinance can formally demand the following from any short-term rental platform operating in its jurisdiction:

• The physical address (including the 9-digit ZIP code) of every STR listing within the city during the reporting period, no more often than quarterly (Gov. Code 50993)
• Upon request: the assessor’s parcel number (APN), the exact listing URL, and any unit-specific information needed to identify individual units at shared addresses
• Monthly reporting if the local agency requires monthly tax remittance

Platforms must also display the host’s local license number and any transient occupancy tax certification directly in the listing. Failure to comply triggers administrative penalties under Government Code Section 53069.4. Published legal analyses widely cite a maximum fine of up to $10,000 per day for non-compliant platforms, though investors should verify against the enrolled bill text for their specific compliance planning.

The Mechanism Cities Are Building Toward

Here is what eight months of SB 346 actually looks like in practice. Honest answer: we do not yet have documented cases of a California city using SB 346 data to build a prosecution. No city has published a press release confirming it formally invoked the law to obtain platform records. The law exists. The data pipeline exists. The trigger has not been publicly pulled.

This is not unusual. SB 346 is not self-executing. Each California city must first adopt its own local ordinance specifically invoking the law before the platform reporting obligation activates. As of the most recent available information, most California cities have not taken that step publicly.

What cities have instead is what they already built before January 1, 2026: their own enforcement infrastructure. Los Angeles has required monthly platform data reporting for years. San Diego has run its Short-Term Residential Occupancy program with its own data-sharing arrangements since 2023. Santa Monica has maintained aggressive independent enforcement since long before SB 346 existed.

The story of those pre-existing systems is also the story of where SB 346 is headed.

Los Angeles: From Permit Revocation to Civil Lawsuits

The August 2026 enforcement action was not the first time LA City Attorney Feldstein Soto reached for civil litigation to address illegal STR operators. It was not even the largest such action in the past two years.

In March 2025, the city filed a $62 million civil lawsuit against nine defendants, including Akiva Nourollah, Micah Hiller, and several related entities, for operating dozens of properties as unpermitted STRs, including rent-stabilized units, over thousands of rental nights. That case (25STCV07712, Los Angeles County Superior Court) alleged fake host identities and false advertising claiming properties were located in Beverly Hills and West Hollywood to circumvent local registration rules.

In July 2025, the City Attorney filed a separate action against Airbnb itself, alleging the platform raised prices above legal limits on thousands of properties following the January 2025 wildfire emergency declarations. Airbnb moved to dismiss. The court denied the motion. The case proceeded into 2026.

Then came August 21, 2026.

Three enforcement actions in roughly 17 months. Each one civil. Each one targeting multi-property operators, rent-stabilized unit violations, and platform-facilitated evasion. Documents show a consistent enforcement strategy: identify the networks first, then litigate the full scope of violations rather than chasing individual permit appeals.

SB 346 did not cause these actions. But SB 346 is the reason the next round will be easier to execute.

Santa Monica: $18 Million and 62 Units

On January 22, 2026, the Santa Monica City Attorney filed civil proceedings in Los Angeles County Superior Court against Hamid Enayati, Nicole Massarat, Jaleh Forouhar, Nina Enayati, Nina Property Management Inc., and numerous controlled LLCs.

The lawsuit alleged that the Enayati family enterprise converted at least 62 rent-controlled residential units across 25 properties into short-term rentals, completing approximately 3,000 illegal reservations through Airbnb and related platforms. Santa Monica sought disgorgement of approximately $18 million in profits plus civil penalties of $2,500 per violation.

Sources confirm Santa Monica used its own Residential Leasing Requirements Ordinance to build the case, not SB 346. The city’s enforcement infrastructure did not need the state law to identify the violations. What SB 346 enables, when cities formalize their ordinances under it, is running that same identification process at scale across far more operators simultaneously, with platform-delivered data rather than city-conducted investigations.

That distinction is the point. SB 346 is a force multiplier for cities that already know how to enforce. Los Angeles and Santa Monica have demonstrated they know how to enforce.

What Platform Data Actually Reveals

To understand why SB 346 matters beyond headline enforcement actions, consider what the data pipeline actually delivers when a city invokes it.

Every address. Every APN. Every listing URL. Delivered no more often than quarterly, or monthly where the city requires monthly tax remittance (Gov. Code 50993). Cross-referenced against the city’s permit database, a jurisdiction instantly identifies which active listings have no corresponding permit, which registered addresses appear on rent-stabilized unit rolls, and which hosts are running multi-property operations without commercial registration.

That is the kind of audit that previously took months of investigator time to assemble. Under SB 346, with a conforming ordinance in place, it becomes a data import exercise.

Cities with large unlicensed STR populations are watching Los Angeles and Santa Monica. San Francisco, Sacramento, San Diego, Oakland, Palm Springs, and Santa Barbara all have regulatory frameworks in place. Some have enforcement track records. What most have lacked is a scalable way to turn listing data into enforcement targets. SB 346 is that bridge.

The question for California STR investors is not whether cities will use this mechanism. It is when, and whether your portfolio will be compliant when they do.

What California Operators Need to Do Now

Data indicates that across California, a significant share of active STR listings operate without valid local registration. Senator Durazo cited estimates of 25 to 70 percent unlicensed activity at the time of SB 346’s passage (Assembly committee analysis). The enforcement actions in Los Angeles and Santa Monica targeted the most visible corner of that problem: multi-property operators using rent-stabilized housing.

But the data request, when cities formally invoke it, will not filter for size. It will return every address.

Here is what operators should be doing right now:

Verify your registration is current and accurate. LA enforcement documents show a pattern of operators using expired registration numbers, voided permits, or registration numbers that belong to different addresses. A permit that existed two years ago is not the same as a permit that is current today. Confirm the status directly with your city’s STR licensing office, not through the platform dashboard.

Check your property’s rent stabilization status. The August 2026 lawsuit, the March 2025 lawsuit, and the Santa Monica action all centered on rent-stabilized units. Every one of these cases shows a civil enforcement team specifically looking for this violation. If you are uncertain whether your property carries rent stabilization obligations under the LA RSO or similar frameworks, get a clear answer now.

Do not assume pre-existing compliance exempts you from SB 346 data sharing. Platforms must provide data when a city formally requests it under SB 346. Any gap in your compliance status, a lapsed permit, an unlisted property, an address listed differently on the platform than in city records, is now potentially discoverable at scale.

Multi-property operators face the highest exposure. The enforcement pattern from LA is consistent: investigators identify networks, not individual listings. If you operate three or more properties in any California market, your operational footprint is the kind that enforcement actions have specifically targeted. Document your compliance, maintain records of each property’s permit history, and review your listing metadata against city records regularly.

The StaySTRA Analyzer can help you assess the regulatory environment in specific California markets before you make portfolio decisions. For a broader overview of California market performance and regulatory risk by city, the California STR market data page covers 275 cities. For the full legal framework context, our earlier deep-dive on how SB 346 works and which cities were positioned to use it provides important background.

What Operators in Smaller California Markets Should Expect

Los Angeles and Santa Monica have the enforcement capacity to use SB 346 data at scale. Most California cities do not, yet. Palm Springs, Santa Barbara, Sonoma, and Sacramento have all shown interest in STR compliance but have not matched the civil litigation tempo of LA or Santa Monica.

That gap will close. Here is why.

SB 346 does not require cities to build enforcement departments from scratch. It requires them to adopt an ordinance and submit a data request. The platform delivers the file. A city with two code enforcement officers and a spreadsheet can cross-reference hundreds of active listings against valid permits in an afternoon.

The cities watching LA and Santa Monica are not watching to decide whether to enforce. They are watching to learn the fastest way to do it without the years of infrastructure those cities built. SB 346 is the shortcut they have been waiting for.

Legislative records show Airbnb, Booking Holdings, and VRBO parent Expedia Group were registered in opposition to SB 346 unless amended (Assembly committee analysis). The platforms will comply. They were planning to from the moment the bill passed.

For operators in markets that have not yet issued SB 346 data requests, the window to get compliant is open. It will not stay open indefinitely. The pattern from every major enforcement ramp-up in US STR history, New York, New Orleans, Austin, Houston, is that operators caught in the first enforcement wave face the harshest consequences. The second and third waves find a market that has largely self-regulated.

California is in the pre-ramp period. Eight months in, the infrastructure is in place. The first formal data requests are a policy decision away. For a comprehensive guide to STR laws by city and state, see our STR regulations guide.

We do our best to keep our reporting accurate and up to date, but situations evolve and we are only human. Always verify current details directly with local officials and sources before making decisions.

Assess your California STR compliance exposure now. Use the StaySTRA Analyzer to evaluate regulatory risk and revenue potential in specific California markets before SB 346 enforcement scales.