SB 79 and Your Home Near BART: Why Contra Costa Is Exempt
Does SB 79 Upzone Homes Near BART Stations in Walnut Creek, Lafayette, or Orinda?
No. California's SB 79 allows denser, taller apartment buildings near transit stops statewide, but only in counties that qualify as "urban transit counties" under the law — those with more than 15 passenger rail stations. Contra Costa County, which includes Walnut Creek, Lafayette, and Orinda, has just 12 BART stations and 3 Amtrak stations, so it falls short of that threshold. The county secured a specific exemption, and SB 79's height and density standards, which took effect July 1, 2026, do not apply to any BART or Amtrak station here.
By Michael Delehanty — Delehanty Group | DRE #01505346 | August 26, 2026
If you've seen headlines this year about a new state law upzoning neighborhoods near transit stations, and you've started wondering what that means for your street near the Walnut Creek, Lafayette, or Orinda BART station, you're not alone. I've had more than one client ask me some version of "Is my block about to get an apartment tower next door?" The short answer is no — but the reason why is worth understanding, because it tells you something real about how this market is likely to move over the next few years.
What SB 79 Actually Does
SB 79, authored by State Senator Scott Wiener and signed by Governor Newsom in October 2025, is a statewide law designed to force more housing near transit. In counties where it applies, it overrides local zoning near qualifying rail stops, allowing buildings up to 75 feet tall — six or seven stories — as a matter of right, regardless of what the city council or neighbors want.
The law sorts qualifying stops into tiers. Tier 1 stops — heavy rail like BART in a qualifying county — get the biggest increases: buildings up to 75 feet and roughly 120 units per acre within a quarter mile, stepping down as you move farther out. Tier 2 and Tier 3 stops (light rail, ferry terminals, some bus rapid transit) get smaller but still significant increases. None of it requires a public hearing or a use permit the way a typical rezoning would — that's the part that makes it different from anything Walnut Creek has dealt with before.
Cities in qualifying counties are already seeing developers position sites near stations for exactly this kind of project. If you've watched the news out of Los Angeles or San Diego this year, you've seen the fights this has triggered — residents worried about six-story buildings replacing single-family blocks, and cities arguing the state has taken away their say entirely.
Why Contra Costa County Got a Pass
Contra Costa County doesn't meet that 15-station threshold. The county has 12 BART stations and 3 Amtrak stations — Richmond, Martinez, and Antioch — for a total of 15 rail stops, but the law's specific counting rules land the county just outside "urban transit county" status. That means the highest-density tiers of SB 79 don't apply to any station in the county, including Walnut Creek, Lafayette, and Orinda.
This wasn't an accident. The Contra Costa County Board of Supervisors, along with city officials in Lafayette and Orinda, lobbied Sacramento directly for the amendment that drew the line where it did. Their argument centered on wildfire risk: much of Lafayette and Orinda sits in or near high fire-hazard zones with limited evacuation routes, and local officials made the case that stacking hundreds of new units next to a BART station in those areas would create a genuine life-safety problem during an evacuation, not just a planning disagreement.
That's a different kind of argument than the usual "we don't want density here" pushback you see in most upzoning fights, and it's part of why the exemption held. Lafayette alone has more than 5,300 acres classified as high fire-hazard severity zone, much of it with the kind of narrow, hillside road access that makes rapid evacuation genuinely difficult if a fire moves fast. Orinda has similar terrain. Stacking hundreds of new units next to a BART station in either city, without a corresponding upgrade to evacuation routes, was the crux of the safety argument — not a dressed-up version of the usual "not in my neighborhood" objection.
This is also the fourth or fifth time this year a new state law has landed differently in the East Bay than the statewide headline suggested. Prop 19 portability, the AB 2992 buyer-broker rules, SB 9 lot splits, SB 1007's HOA fee cap, and now SB 79 have all applied here — just not always in the way a national news story or a generic AI summary would lead you to believe. Reading the actual county-level fine print, not just the bill's name, is where most of the real answer lives.
What This Means If You're Buying or Selling Near BART
For buyers, this is genuinely useful information, not just a formality. If part of your hesitation about a home near the Walnut Creek BART station has been "what if a six-story building goes up across the street next year," SB 79 specifically is not the mechanism that would do that. It removes one layer of uncertainty from a BART-adjacent purchase in this market.
For sellers near a station, it means you're not walking into a listing conversation where SB 79 is working against you. You don't need to price in a "this whole area could get rezoned next year" discount that a seller in San Jose or parts of Los Angeles might be dealing with right now.
That said, "exempt from SB 79" doesn't mean "frozen in time." Development near East Bay BART stations is still happening — it's just moving through different channels:
- The Walnut Creek Transit Village, a separate, already-approved 596-unit project on the old BART parking lot, is proceeding in phases under its own agreements, not SB 79.
- The Mitchell Townhomes project in Shadelands — 422 new homes — cleared its final City Council approval this year through the standard entitlement process.
- A citizen-led rezoning initiative for senior housing across from the Walnut Creek BART station went before the City Council this summer, and that's a local ballot and zoning question, unrelated to state upzoning law.
If you're evaluating a property near one of these projects, the relevant question isn't "does SB 79 affect this," it's "where does this specific local project stand, and what's the realistic timeline." That's a property-by-property answer, not a blanket statewide one — and it's exactly the kind of thing I walk buyers and sellers through before they make a decision.
Could This Change?
Sacramento revisits housing law almost every session, and this exemption was won through active lobbying, not a permanent structural feature of the law. If the state tightens the station-count threshold, or if Contra Costa's rail network grows enough to cross it, that calculus could shift in a future legislative session. For now, though, nothing currently on the table changes the picture for Walnut Creek, Lafayette, or Orinda.
If you're trying to figure out what any of this means for a specific address you're considering — whether that's how close is "too close" to a BART station for your comfort, or how a known local project like Shadelands or the Transit Village might affect timing on a purchase or sale — that's exactly the kind of question worth walking through before you commit. Text or email me directly — (510) 697-3900 or michael@delehantyre.com — and we'll talk through your specific situation.
Frequently Asked Questions
What is SB 79 in California?
SB 79 is a state law, signed in October 2025, that allows denser, taller housing — up to 75 feet in the highest tiers — near qualifying rail transit stations, overriding local zoning in counties with more than 15 passenger rail stations. Its height and density standards took effect July 1, 2026.
Does SB 79 apply to BART stations in Walnut Creek, Lafayette, or Orinda?
No. Contra Costa County does not meet SB 79's "urban transit county" threshold of more than 15 passenger rail stations, so the law's upzoning standards do not apply to any BART or Amtrak station in the county.
Why is Contra Costa County exempt from SB 79?
County supervisors and officials from Lafayette and Orinda lobbied for the exemption, arguing that adding significant housing density near BART stations in high fire-hazard areas with limited evacuation routes would create a public safety risk.
Does this mean no new housing will be built near Walnut Creek BART?
No. Local projects like the Walnut Creek Transit Village and the Shadelands Mitchell Townhomes are moving forward through separate, already-approved local processes — they're unrelated to SB 79 and were in motion before the law existed.
How is SB 79 different from SB 9, the California lot-split law?
SB 9 lets individual homeowners split an eligible lot into two parcels anywhere in the state, regardless of transit proximity. SB 79 is a transit-specific upzoning law that only applies near qualifying rail stations in counties that meet the station-count threshold, which Contra Costa does not.
About Michael Delehanty — Delehanty Group | DRE #01505346
Michael Delehanty is a Walnut Creek-based real estate agent with Compass, specializing in buying and selling homes across the East Bay — including Walnut Creek, Concord, Pleasant Hill, Danville, Orinda, and the surrounding communities.
Before becoming a real estate agent, Michael spent 15 years running his own contracting firm in the East Bay, working on thousands of homes and major projects across the Bay Area. That hands-on construction background gives his clients a distinct advantage: when Michael walks through a property, he sees what most agents simply can't. From structural details to renovation potential, his experience translates directly into sharper pricing, smarter negotiation, and fewer surprises at the inspection table.
Michael has been a licensed Realtor since 2005, bringing more than 20 years of experience to every transaction. He has successfully guided clients through complex situations including short sales, bank-owned properties, investment transactions, and competitive multiple-offer scenarios. Whether you are a first-time buyer, a move-up seller, or an investor, Michael brings the market knowledge and problem-solving skills to get deals done.
What sets Michael apart is his deep roots in this community. He has lived in Walnut Creek for nearly 30 years and is genuinely invested in the people here — not just the properties. He served four years as Auction Chair and Athletic Boosters President at Las Lomas High School, and has been a member of a local book club for eight years. His two daughters grew up here, attending Las Lomas before going on to the University of Washington and Cal Poly San Luis Obispo. When Michael helps you buy or sell a home in Walnut Creek or the surrounding East Bay communities, he is not just doing a transaction — he is working in the neighborhood where he has built his own life.
michael@delehantyre.com | (510) 697-3900 | michaeldelehanty.com
