A coalition of pro-housing groups is suing San Francisco and the state to unwind the city's exemption of roughly 1,900 SoMa, Bayview and Bayshore parcels from SB 79 — and the strongest thread they pull is a provision California's own housing regulators already flagged as unlawful before signing off on the city's plan anyway.

SB 79, state Sen. Scott Wiener's transit-oriented density law, took effect July 1 and overrides local zoning to allow taller housing near major transit. It lets cities adopt "alternative plans" and carve out narrow "industrial employment hubs." San Francisco did both — and three housing advocates (YIMBY Law, Californians for Homeownership and the California Housing Defense Fund) say the city stretched those escape hatches past the breaking point. The suit is a test of whether the law's local off-ramps are real or, as the plaintiffs argue, a way to neutralize the statute from inside.

San Francisco spent the spring building itself a door out of California's newest housing mandate. In May, Mayor Daniel Lurie signed an ordinance carving big stretches of the Bayshore, Bayview and SoMa out of the reach of SB 79, the transit-density law that took effect July 1. On Thursday, a coalition of housing groups sued to slam that door shut, filing a petition in San Francisco Superior Court (external source, opens in a new tab) that names two defendants: the city itself and the state's housing regulator, HCD.

The Reddit-level version of this fight is about timing — did the city label its industrial zones early enough to qualify? The real complaint is narrower and more damaging. To wall off an "employment hub," a jurisdiction has to clear four separate bars: the zone must be a contiguous stretch of at least 250 acres; it must have appeared as "employment lands" in the general plan no later than Jan. 1, 2025; it must be mostly industrial; and it can't allow homes on any parcel it shields. The plaintiffs contend the city's hubs clear none of the four (external source, opens in a new tab) — that several of the zoning districts folded inside already allow some housing (in-law units, below-market projects, teacher housing), and that once state-owned land and housing-eligible lots are subtracted, the SoMa and Bayview zones shrink under the 250-acre minimum.

That contradiction is the case's spine. The city has spent years funding and building affordable and supportive homes in SoMa, then turned around and told Sacramento the neighborhood is closed to new ones. Sonja Trauss, who runs YIMBY Law, said San Francisco "can't have it both ways," calling the designation an effort to choke off supply even as one-bedroom rents push past $4,000 a month.

The second claim is the one that should rattle City Hall most, because the state raised it first. The city's ordinance wrote a new provision, Planning Code Section 207.11, that the housing groups say stops projects from stacking the State Density Bonus Law on top of SB 79 density — a combination SB 79 spells out as allowed. Regulators caught it. Reviewing the plan on July 1, HCD concluded the section illegally blocks qualifying projects from tapping the density bonus, then handed the city conditional approval anyway — on the understanding that SF would leave the offending language unenforced. That fix doesn't hold, the plaintiffs argue: if the city's capacity math depends on rules that can't legally stop qualifying projects, the alternative plan collapses and SB 79 governs directly.

Sonja Trauss, who runs YIMBY Law, said San Francisco "can't have it both ways," calling the designation an effort to choke off supply even as one-bedroom rents push past $4,000 a month.

The city, said Dylan Casey, who leads the California Housing Defense Fund, is bending the statute past recognition to blunt its affordability impact.

YIMBY Law attorney Ryan Patterson was blunter. San Francisco, he said, is counting capacity already pledged under Lurie's Family Zoning Plan and the density bonus law a second time, as if SB 79 had generated it — "effectively triple-dipping."

The city attorney's office said it would review the complaint and answer in court; spokesperson Alex Barrett-Shorter declined further comment. Neither the mayor's office nor Supervisor Matt Dorsey, whose district covers SoMa, answered the Standard's requests for comment.

The stakes run past the city line. SB 79 was built to strip zoning power from local governments near transit; if a city can fence off 1,900 parcels by branding them employment hubs, every jurisdiction in the state gets the same escape hatch. A ruling against San Francisco would shrink it. This is the second time in 2026 that YIMBY Law has taken the city to court — in February it went after the Family Zoning Plan (external source, opens in a new tab) as too thin to hit SF's state target of 82,000 units by 2031 — and at this rate, residents may learn what SB 79 actually demands from a judge before the city finishes putting it into effect.