Starting July 1: state law makes dense housing near transit stops by-right in eight California counties

Three weeks from now, a California housing law takes effect that every property owner near a Bay Area BART or Caltrain station should understand. Senate Bill 79 (Wiener), signed by Governor Newsom on October 10, 2025, becomes operative on July 1, 2026. On that date, qualifying high-density housing near major transit stops becomes a by-right use in eight California counties — regardless of what local zoning says.

Eight counties, two tiers, two distances

SB 79 applies to "urban transit counties" — defined as counties with at least 15 passenger rail stations. Eight currently qualify: Alameda, San Francisco, San Mateo, Santa Clara, and Sacramento in Northern California, plus Los Angeles, Orange, and San Diego in the south. (Contra Costa has BART stations but does not reach the 15-station threshold under this definition.)

The law divides qualifying transit stops into two tiers. A Tier 1 stop serves heavy rail or very high-frequency commuter rail — BART, major Caltrain stations, LA Metro Rail. Projects within one-quarter mile of a Tier 1 stop get the law's most permissive development standards. A Tier 2 stop serves light rail, high-frequency commuter rail, or qualifying Bus Rapid Transit, with a one-half mile qualifying zone.

What 'by-right' actually means on these sites

A qualifying project — at least five units at a minimum density of 30 dwelling units per acre — is entitled to ministerial approval. The planning commission cannot reject it on discretionary grounds. California HCD's implementation guidance confirms the law permits housing up to 95 feet in height and up to 160 units per acre near qualifying Tier 1 stops, with density bonuses available on top. The critical phrase throughout the statute is "regardless of" — regardless of the local general plan, regardless of zoning.

The affordability floor that comes with it

Projects of more than ten units must include income-restricted units: 7% for extremely low-income households, 10% for very low-income, or 13% for lower-income. The affordability commitment is long-term and runs with the property. It applies whether or not the city has its own inclusionary housing rules.

Cities can redirect it — they can't reduce it

Local governments aren't powerless. SB 79 lets a city adopt its own alternative Transit-Oriented Development plan that adjusts which sites the law covers or how standards apply. The condition: the alternative must allow at least as much total housing capacity as SB 79's defaults. Redirect the density, yes. Lower the ceiling on total units, no. CalMatters reported in April 2026 that cities across the covered counties are scrambling — some adopting alternatives, others still in resistance — ahead of the July 1 date.

You can redirect it. You cannot reduce it.

My read for clients: if you own land — or are evaluating a site — within a half-mile of a BART, Caltrain, VTA Light Rail, or BRT stop in the Bay Area, the legal ceiling on what can be built there just changed. That affects site value, comparable sales, and what counts as a reasonable offer. And if you live near a transit stop and have been tracking what might rise next door, the answer after July 1 is: more, and taller. I'd rather you hear this with three weeks to act on it than find out when a neighbor's permit application lands.