Seattle did not ban technology companies or rental software generally. On June 24, 2025, the Seattle City Council approved Council Bill 121000, later enacted as Ordinance 127241. Mayor Bruce Harrell signed it on July 1, 2025. The measure targets a narrower practice: services that combine nonpublic data from multiple landlords and use automated systems to recommend rents, renewal terms, or occupancy levels to more than one landlord.
The ordinance creates Seattle Municipal Code Chapter 7.34, titled Algorithmic Rent Fixing. It is not traditional rent control, does not impose a citywide rent ceiling, and does not automatically lower a renter’s existing rent.
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The short version
- What Seattle banned: Certain algorithmic rent-coordination services used across multiple landlords.
- Who is covered: Landlords that contract for the prohibited services and providers that supply them to multiple landlords.
- What is not banned: Technology generally, ordinary property-management software, every automated rent calculation, or all public rental estimates.
- Maximum penalty: Up to $7,500 per violation in a City Attorney action.
- Private remedy: An injured person may bring a civil action and seek up to $7,500 per violation plus actual damages, subject to the ordinance’s requirements.
- Immediate effect on leases: The ordinance does not automatically change the rent in an existing lease or require landlords to reduce rents.
The complete ordinance is available in the Seattle legislative record.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsWhat conduct does the ordinance prohibit?
The law focuses on “coordination.” In general terms, a service provider is covered when it does both of the following:
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- Collects historical, anticipated, or current information—such as rents, rent changes, supply, occupancy, lease terminations, or renewals—from at least two landlords or databases; and
- Processes that information through an algorithmic or automated system to recommend rental prices, renewal terms, or occupancy levels to more than one landlord.
The ordinance makes it unlawful for a landlord to contract with, or exchange anything of value for, those coordinating services. It also prohibits a service provider from providing coordinating services to two or more landlords.
That means the law is aimed at a particular combination of shared landlord data, automated analysis, and recommendations distributed across competing properties. A landlord’s use of an algorithm by itself does not establish a violation, and a rent increase by itself is not proof that prohibited software was involved.
How the disputed pricing model is supposed to work
Critics of algorithmic pricing systems say the risk arises when competing landlords contribute sensitive information to a common service. The system analyzes data about rents, vacancies, occupancy, renewals, and other market conditions, then recommends prices or related terms for multiple properties.
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Critics allege that this arrangement can make it easier for landlords to coordinate indirectly rather than negotiating openly with one another. The city’s legislative findings connect the concern to the national controversy surrounding RealPage and similar software.
Those allegations remain distinct from a legal finding that every customer, recommendation, or rent increase was unlawful. RealPage has argued that its system primarily uses publicly available data and provides market analysis with suggested prices. The company has denied that its software encourages landlords to keep units off the market or simply select higher rents. Industry representatives also objected that Seattle’s process moved too quickly and could sweep in ordinary market analysis.
What remains legal?
Seattle’s measure is not a prohibition on all landlord technology. The ordinance includes important boundaries and exclusions.
Publicly available rental estimates
A tool using only publicly available information may fall outside the definition when that information is equally available to everyone and is obtained without a contract or agreement that gives the user special access. A public estimate is not automatically exempt in every circumstance; the ordinance’s specific conditions matter.
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Basic software used to store lease records or maintain property records is expressly excluded when it is not being used for otherwise prohibited conduct. The law therefore does not prevent landlords from using software for routine administrative functions.
Other property-management functions
The ordinance does not prohibit software used for every property-management task. Tools for maintenance requests, accounting, communications, document storage, or other operational functions are not automatically covered merely because they are digital or automated.
Hotels and short-term rentals
Hotels and short-term rentals are excluded from this chapter. The measure addresses the specified rental-housing conduct covered by the ordinance, not every form of lodging pricing.
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Why did Seattle pass the measure?
Seattle officials framed the ordinance as a housing-affordability and renter-displacement measure. The council’s legislative findings cite a claimed 32% inflation-adjusted increase in average monthly rents between 2012 and 2022. They also cite a Washington Attorney General estimate that approximately 800,000 Washington leases were priced using RealPage software between 2017 and 2024.
Those numbers are legislative findings and attributed estimates, not proof that the ordinance has reduced rents or that software caused every increase. Housing costs also reflect supply, construction expenses, interest rates, insurance, taxes, operating costs, local regulations, and demand.
The ordinance also cites a 2022 ProPublica investigation reporting that, in one Seattle neighborhood, 70% of apartments were overseen by 10 property managers and all used RealPage pricing software. That is a reported observation included in the city’s legislative record—not proof that RealPage caused every rent increase in that neighborhood.
Who sponsored the legislation?
Councilmember Cathy Moore introduced the legislation. Alexis Mercedes Rinck and Dan Strauss are listed as sponsors in the legislative record. The council’s introduction announcement and passage announcement described the measure as an effort to prevent anti-competitive rent hikes and renter displacement.
When did the ban take effect?
The Council passed the amended bill on June 24, 2025. The council’s release described the vote as 7–0 with one abstention. The measure became Ordinance 127241 after Mayor Harrell signed it on July 1, 2025. Its effective date is governed by the ordinance’s own effective-date provisions, so the ordinance text—not the original vote-day headlines—controls the timing.
Penalties and enforcement
The ordinance is enforceable rather than merely advisory. It allows the City Attorney to seek civil penalties of up to $7,500 per violation. Each instance of providing coordinating services for each dwelling unit can be treated as a separate violation.
The law also creates a private civil remedy. A person injured by a violation may sue and seek up to $7,500 per violation in addition to actual damages, with possible attorneys’ fees and costs for prevailing parties as provided by the ordinance.
The phrase “up to” matters: the maximum penalty is not an automatic fine imposed in every case. Liability, the number of violations, available damages, and procedural requirements would depend on the facts and the applicable legal process.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the ordinance means for Seattle renters
The law does not automatically change an existing lease, cancel a rent increase, or require a landlord to reduce rent. It also does not guarantee that rents will fall. Instead, it attempts to remove one alleged source of anti-competitive pricing pressure.
A renter who believes prohibited coordination affected a rental decision should preserve relevant evidence, including:
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- Rental advertisements and screenshots showing the listed price;
- Lease and renewal documents;
- Rent-increase notices;
- Communications with the landlord or property manager; and
- Records showing dates, unit details, and any changes in offered terms.
Evidence of a rent increase alone does not establish a violation. A renter considering a private lawsuit should obtain legal advice about the ordinance, available evidence, deadlines, and whether the facts satisfy its requirements. Questions about city enforcement should be directed to the Seattle City Attorney or the relevant city office; the available record does not establish that Seattle has already imposed particular penalties or ordered refunds.
What it means for landlords and software providers
Landlords and property managers operating in Seattle need to distinguish routine property-management tools from services that collect competitively sensitive information from multiple landlords and generate recommendations for multiple landlords.
Software providers face a separate restriction: even if a landlord does not personally develop the system, the provider may not supply covered coordinating services to two or more landlords. Providers and customers should examine data sources, contractual arrangements, the users receiving recommendations, the types of outputs produced, and whether the service covers Seattle dwelling units.
The ordinance does not resolve the broader question of whether a particular algorithmic-pricing practice violates federal or state antitrust law. It creates a Seattle-specific prohibition with its own definitions, exclusions, remedies, and enforcement provisions.
Does this amount to rent control?
No. Traditional rent control generally sets or limits the amount a landlord may charge or the size of permitted increases. Seattle’s ordinance does not establish a maximum rent, prescribe a permitted annual increase, or require a rent reduction.
It regulates a pricing practice instead: the use of certain cross-landlord algorithmic coordination services. Whether that change ultimately affects rents, vacancies, housing supply, or software adoption is an empirical question rather than an automatic result of enactment.
What remains unknown
The ordinance’s long-term effect cannot be determined from its passage alone. Important questions include whether covered services were widely used in Seattle, how providers change their products, how landlords replace the services, whether enforcement actions occur, and whether rents or vacancy patterns change.
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