San Francisco's first-in-the-nation ban on landlords' rent-setting algorithms has produced exactly zero lawsuits in the two years since it passed — a record of non-enforcement that has less to do with landlord compliance than with how the ordinance was drafted to be enforced.

In September 2024 the Board of Supervisors made it illegal to use "algorithmic devices" like RealPage and Yardi to price rentals, with fines reaching roughly a thousand dollars for each violation. As the San Francisco Standard's Maggie Angst first reported this month, neither the City Attorney's office nor the San Francisco Anti-Displacement Coalition is aware of a single civil action ever filed under it. That silence is easy to read as failure. But the law leans on private tenants to sue over software they cannot see, and it took effect just before the AI investment boom overwhelmed exactly the supply-starved market it was meant to cool. The result is a headline policy that was structurally unlikely to ever be tested in court.

San Francisco moved fast on the algorithm. It has moved much slower on everything the algorithm was blamed for.

The ordinance, authored by then-Board President Aaron Peskin and co-authored by Supervisor Connie Chan, cleared the Board of Supervisors in September 2024 (external source, opens in a new tab) with almost no floor debate. It grew out of a 2022 ProPublica investigation (external source, opens in a new tab) into RealPage's YieldStar product that pushed the practice onto the national agenda. San Francisco went first; other cities and states later copied the idea.

The catch is in the enforcement design. A violation can cost a landlord roughly a thousand dollars apiece, on top of damages, restitution and legal fees — but collecting any of it generally requires someone to bring a case. In practice that means a tenant, or the City Attorney, must first prove a landlord used covert pricing software fed by nonpublic competitor data. Renters rarely know which tool set their rent, and the data behind it is, by design, hidden. A ban that hinges on detecting a secret is a ban that is hard to litigate. Chan, who later expanded the measure, told the San Francisco Standard she is not convinced every landlord has stopped, and pointed renters who suspect they were harmed toward the City Attorney or tenant groups — a tacit admission the city is depending on tenants to surface cases it cannot detect itself.

Peskin now frames the ban as a naming-and-shaming win rather than a courtroom one. He told the Standard it helped hold rents down in its first year — but that, he added, was before what he described as a "trillion dollars" of AI money washed back over the city.

That money is the second reason the ban reads as toothless. City economic analysts declared this month that San Francisco has entered "an accelerating period of economic growth" they tie to the artificial-intelligence surge. Asking rents for vacant apartments climbed 14% between March and July (external source, opens in a new tab), per ApartmentList, which ranked San Francisco's July rent growth the fastest of any major U.S. city. Office vacancy, tracked by JLL, slid to 32% from more than 35% a year earlier. Demand snapped back faster than any ordinance could move.

He told the Standard it helped hold rents down in its first year — but that, he added, was before what he described as a "trillion dollars" of AI money washed back over the city.

Even RealPage's critics grant the mechanics. The likelier engine of the current spike is a demand shock rather than collusion, UC Davis management professor Hemant Bhargava told the Standard, noting that demand can shift far faster than housing supply can respond. His blunt read on the ban: it is "barking up the wrong tree."

The software's makers were never the whole story, but they weren't a phantom either. In November 2025 the Department of Justice settled its antitrust case against RealPage (external source, opens in a new tab), barring the company from using rivals' nonpublic data in its rent recommendations and ordering it to retrain its models — a federal remedy that reached further than San Francisco's untested local statute. RealPage, which put its own San Francisco footprint at 10% of units against Peskin's office's estimate of up to 70%, called blaming pricing tools "a distraction from the real opportunity to address housing affordability."

Two years in, the tally is stark: one novel law, zero suits, and rents at record highs. The ordinance may yet shame the practice into retreat. What it was never built to do was outrun a boom.