This summer, Los Altos finished a piece of paperwork that had been drifting for three decades. The city's fire contract with Santa Clara County Fire, in place since 1996, is set to expire at the end of 2026, so in June the county's Local Agency Formation Commission approved the city's application to become a permanent member of the fire district instead of a renewing customer. A 21-day protest period followed the vote. Barring a reversal, Los Altos will close out 2026 belonging to one more countywide agency than it started the year with.
Two miles south, in the hills between Foothill Expressway and Rancho San Antonio Open Space Preserve, a different jurisdictional question has sat open since 1941 and still hasn't closed. Roughly 1,125 homes carry a Los Altos mailing address in a neighborhood most locals call San Antonio Hills, or Country Club-Loyola, after the 100-year-old golf course at its center. About 150 of those homes, 14 percent, sit inside the Town of Los Altos Hills. The rest sit in unincorporated Santa Clara County. None of them are inside the City of Los Altos, no matter what the mail says.
One Neighborhood, Three Governments
The neighborhood covers a little over a square mile, bounded by Foothill Expressway, Magdalena Avenue, Ravensbury Avenue, Rancho San Antonio Open Space Preserve, and Permanente Creek. Interstate 280 cuts through the middle, splitting it into a lower section holding about two-thirds of residents and an upper section with the rest. The homeowners' association that has represented the area since 1941, San Antonio Hills Inc., still administers its own deed restrictions through an Approval Committee, which means an exterior renovation here can face two separate reviews. One is whichever government actually holds zoning authority over that parcel. The other is a private board enforcing covenants that predate the interstate running through the neighborhood.
None of that shows up on a listing sheet. A buyer sees "Los Altos" in the address field, assumes City of Los Altos zoning and permit rules apply, and finds out otherwise only after a contractor pulls the parcel number and comes back with a different building department's name on it.
Why the Address Never Changed
The neighborhood has voted on this before. A 1997 survey of San Antonio Hills residents found a majority favored annexing to Los Altos Hills, with annexing to the City of Los Altos as the second choice. Neither happened. Ted Brown, who led the association's annexation committee at the time, described the neighborhood as being "under considerable pressure from developers taking lots a half-acre or less." That line points to the real obstacle: Los Altos Hills requires one-acre minimum lots, and a wholesale annexation would have instantly made much of San Antonio Hills nonconforming under the town it was trying to join.
The gap in services is not hypothetical. One resident on Frontero Road, a street running parallel to Foothill Expressway, wanted a sound wall like the ones protecting Los Altos properties along the same road. The county told her it was too expensive. She later described dealing with the county as "a whole different ball of wax than dealing with the city." Whether that's still literally true today matters less than what it illustrates: two households on the same expressway, under two different governments, can end up with two different outcomes on the same request.
The private layer adds its own history. In 1992, a builder working with Bayhill Development Company bought a parcel on Plateau and Magdalena avenues and built three houses on it. The homeowners' association sued, arguing the project violated the neighborhood's covenants by not maintaining separate lots. A Santa Clara County Superior Court judge ruled in the builder's favor in 1993. That outcome came from a civil courtroom, not a city planning commission, because the enforcement mechanism in this pocket is a private HOA contract, not a municipal zoning code. For a buyer, that distinction changes where a land-use dispute gets resolved and who has standing to bring it.
What Actually Differs, Side by Side
| City of Los Altos | Town of Los Altos Hills | Unincorporated pocket (San Antonio Hills) | |
|---|---|---|---|
| Permit authority | City of Los Altos Building Division | Town of Los Altos Hills Planning & Building | Santa Clara County Department of Planning and Development |
| Lot size context | Varies by zone | One-acre minimum | Often half-acre or smaller |
| Fire service | Contracted with Santa Clara County Fire, moving to full district membership by year-end 2026 | Los Altos Hills County Fire District, itself contracted through Santa Clara County Fire | Covered directly by Santa Clara County Fire's unincorporated service area |
| Extra private review | City design guidelines | Mandatory pre-application meeting with a planner, plus town design review | San Antonio Hills, Inc. Approval Committee under 1941 CC&Rs |
The fire line is worth sitting with for a second. Every household in this comparison ends up served by the same fire department, Santa Clara County Fire, whether directly, through the town's contract, or soon through the city's own membership. The agency answering the call doesn't change much across these three columns. The permit process, the lot rules, and who reviews your remodel plans change quite a bit.
What This Means If You're Bidding on a "Los Altos" Address
If your plan involves a remodel, an ADU, or any project with a timeline tied to a school year or a lease expiration, the jurisdiction behind the address matters more than the address itself. A county plan check for a residential addition typically runs four to six weeks for the initial review. The Town of Los Altos Hills adds its own step before that clock even starts, requiring a pre-application meeting with a planner and a filing fee reported at $410 for that meeting alone. Neither of those timelines is the one most buyers picture when they see "Los Altos" on a disclosure packet.
Before writing an offer on a home in or near San Antonio Hills, a few checks are worth doing early rather than after you're in contract:
- Pull the Assessor's Parcel Number and confirm jurisdiction through the county's property lookup tools before assuming which building department applies. A mailing address is not proof of anything.
- Ask whether the parcel carries recorded CC&Rs tied to San Antonio Hills, Inc. That board's Approval Committee reviews exterior changes on top of whatever government permit you also need.
- If the parcel sits in the Town of Los Altos Hills, budget time and a few hundred dollars for the mandatory pre-application meeting before you draw up ADU or major remodel plans.
- If the parcel sits in unincorporated county territory, plan around a four-to-six week initial plan check window rather than whatever timeline a neighboring city posts.
- Don't spend time worrying about fire response. Santa Clara County Fire already covers the pocket and the town under contract, and is on track to cover the city itself as a full member once its current agreement expires.
Frequently Asked Questions
Is San Antonio Hills the only pocket like this near Los Altos? No. Santa Clara County's own LAFCO annexation program groups Los Altos with Mountain View, San Jose, and Saratoga as cities that have made only partial progress absorbing their remaining unincorporated islands, a different bucket than Campbell, Cupertino, and Morgan Hill, which the program credits with annexing most or all of theirs. Los Altos has closed some of these gaps before. In 2006, the city council formally annexed the Blue Oak Lane neighborhood specifically to extend municipal services already available next door. San Antonio Hills has never received that same resolution, in part because the numbers involved are far larger and the political incentives split three ways instead of one.
Does any of this affect what a home here is worth? Nothing in the historical record ties jurisdiction to price. What it does affect is how long a renovation-contingent purchase takes to close out and which office you call when something goes wrong. Those are timeline and process questions, not value questions, but they're the kind that catch relocating families off guard when a permit takes longer than the moving truck's lease.
Buying or renovating in a pocket with more than one government attached to it isn't a reason to walk away. It's a reason to ask the parcel-specific question before you're under contract instead of after. That's the kind of due diligence Michal Amodai built her practice around, combining a background as a real estate attorney with more than a decade of local relocation work to help buyers spot exactly this kind of friction before it becomes a delay. If you're looking at a property anywhere near Foothill Expressway, Loyola, or the Los Altos Hills line, reach out for a straight answer on what governs it, or start with a free home valuation to see where your own search should focus next.
