Say you're under contract on a new build at Bishop Ranch. Three weeks into escrow, a document lands in your inbox called a Notice of Special Tax. California law requires the seller or developer to hand it over within 14 days of opening escrow, and if they miss that window, you have the right to walk away within three days of finally receiving it. Most buyers have never heard of this document until it appears, and by the time they read the number on it, they've already picked paint colors.
That number is Mello-Roos, and in San Ramon it doesn't show up evenly. It concentrates almost entirely in the same places where new construction is happening, which means the neighborhoods marketed as the freshest, most amenity-rich option in the city are also the ones quietly carrying the highest add-on tax. Understanding why changes how you should compare a new build against an older resale home in San Ramon, because the sticker price and the real monthly cost are answering two different questions.
The City Isn't Pricing the Same Everywhere
San Ramon's headline numbers tell a story of a cooling market. Zillow's home value index put the typical San Ramon home at $1,536,120 as of June 2026, down 8.1 percent over the prior year. Redfin's trailing three-month figure through May 2026 showed a median sale price of $1.6 million, down 2.5 percent year over year, with homes moving faster than they did last year, in around 14 days on average.
But that citywide number blends neighborhoods that are behaving nothing alike. Southern San Ramon's median sale price sat at $1.3 million in February 2026, down 10.2 percent year over year. Central San Ramon told the opposite story: a median of $1.5 million through May 2026, up 1.3 percent, with price per square foot climbing 16.6 percent as buyers compete for a shrinking supply of older, smaller-lot homes closer to the original town core.
Meanwhile the established Dougherty Valley communities of Gale Ranch and Windemere have held their $2 million-plus pricing with only modest softening, moving in 12 to 18 days. These are gated, fully built-out, master-planned neighborhoods with no new supply coming. Scarcity alone explains part of that resilience. But scarcity is only half the story, because the other half is a financing structure baked into the land itself.
The Line Item Buyers Watch Isn't the One That Moves
When people compare a new townhome to an older detached house, they usually start with HOA dues, assuming new construction means a bigger monthly bill for amenities. In San Ramon, that assumption often runs backward.
SummerHill Homes' own disclosures for City Village at Bishop Ranch, a 404-home community of detached houses and attached townhomes, break the HOA dues out by product line:
| City Village product | Homes | HOA at buildout |
|---|---|---|
| The Towns (attached, 3-4 bed) | 136 | $373 to $410 per month |
| The Rows (detached, 3-4 bed) | 114 | $121 to $140 per month |
| The Courts (detached, 4 bed) | 154 | $121 to $140 per month |
Compare that to Gale Ranch, the established master-planned community built out across seven named neighborhoods (Avanti, Belvedere, Coronado, Gallery, Monarch, Solaire, and Terravista). Its average HOA runs around $122 a month, and some of the smaller Windemere sub-associations charge as little as $155 a year, closer to $13 a month, for tracts with minimal shared amenities.
In other words, the newest, most heavily amenitized product in the city can carry an HOA bill that's comparable to or higher than a resale home in an older, fully mature community. If HOA dues were the whole story, new construction wouldn't look like the pricier long-term hold. It's the next line down the tax bill that actually separates the two.
The Line Item That Actually Moves: Mello-Roos
Mello-Roos is a special tax authorized under California's 1982 Community Facilities Act, created to let cities fund the roads, schools, and infrastructure a new development needs without waiting on regular property tax revenue, which Proposition 13 caps at 1 percent of assessed value and limits to 2 percent annual growth. A Community Facilities District, or CFD, is a fixed dollar charge per parcel, not a percentage of the home's value, so it doesn't shrink relative to a cheaper home the way ad valorem tax does.
In San Ramon, the charge concentrates almost entirely in Dougherty Valley, meaning Gale Ranch and Windemere, and in the newer Bishop Ranch tracts. Many parcels there carry more than one overlapping CFD stacked on top of each other, so the total has to be read off the specific parcel's tax bill or preliminary title report rather than assumed from a neighbor's number. At the $2 million-plus tier in Gale Ranch and Windemere, combined HOA and Mello-Roos obligations have been documented running $800 to $1,200 or more a month on top of the mortgage. Just over the hill in Dublin's comparable master-planned tracts, single-family CFD assessments have run $3,900 to $5,800 a year, with one parcel owing just over $5,000 across two stacked districts in fiscal year 2025-26. San Ramon's own Dougherty Valley taxes are built on the identical structure.
This is why the HOA comparison above is misleading on its own. A City Village Rows home with a $130 monthly HOA might still carry a CFD assessment that an equivalent Central San Ramon resale, built before Dougherty Valley's CFDs were formed, simply doesn't have. Two homes at a similar list price can have meaningfully different total monthly cost, and the gap is invisible until you pull the tax bill.
Why the City Chose This Structure on Purpose
San Ramon didn't back into Mello-Roos by accident. In 2013, the city's planning commission required a developer building a 48-unit townhouse project to fund the fiscal impact that new development would otherwise place on city services. The developer formed a CFD voluntarily rather than pay differently, the city council adopted it in 2014, and when the Building Industry Association sued to invalidate the tax, a California court of appeal upheld San Ramon's authority to use CFDs this way in 2016, a decision both the California Supreme Court and the U.S. Supreme Court declined to review.
That legal groundwork matters now because San Ramon is in the middle of its largest residential buildout in decades. Sunset Development, the longtime owner of the Bishop Ranch office campus, has laid out plans for roughly 8,400 new homes across the property over the next 20 years, accelerated by Chevron's decision to relocate its corporate leadership out of San Ramon. As of early 2026, 367 units were already completed, 1,055 were under construction, and approvals were in place for another 4,547. Lennar is building 255 detached single-family homes at a new 27-acre neighborhood called Canopy, replacing the former BR8 office site near Executive Parkway and Bishop Drive, with construction expected to begin in mid-to-late 2027. AvalonBay is building a 456-unit rental community on 5.7 acres inside the same district.
Every one of these projects sits inside the fiscal structure the city built for exactly this scale of growth. City Center Bishop Ranch, opened in 2018 with tenants like Pottery Barn, Sephora, and the Slanted Door, already functions as the city's de facto downtown. The CFD mechanism is how San Ramon pays for the roads, parks, and services that keep pace with 8,000-plus new households, and it means every new phase of construction at Bishop Ranch is likely to carry some version of the same charge that already applies across Dougherty Valley.
What to Actually Ask For Before You Offer
The comparison that matters isn't new versus resale on price alone. It's the full monthly number once every line item is accounted for. Before writing an offer in San Ramon, ask for:
- The current year's county property tax bill, so you can see any CFD or special tax line item by name
- The Notice of Special Tax, which lists the current amount, the maximum authorized amount, and the year the tax expires
- The Rate and Method of Apportionment, or RMA, which governs how the tax is calculated and whether it escalates annually
- The preliminary title report, which will show any recorded special assessment liens the seller's disclosure might miss on an older CFD
- The HOA resale package for the specific sub-association, since dues and coverage vary by tract even within the same master-planned community
None of this shows up in a portal's list price. It shows up in escrow, usually later than buyers would like.
A Few Questions Worth Asking First
Does Mello-Roos ever go away? Most CFDs run 20 to 40 years from the date bonds were issued and are retired once those bonds are paid off. Some CFDs fund ongoing services rather than one-time infrastructure, and those can continue indefinitely under their formation documents.
Is Mello-Roos deductible? Deductibility depends on how a specific CFD is structured and current tax law. This is worth a direct conversation with a tax professional rather than a general assumption either way.
Can I negotiate the price down if a home carries a high CFD? Some buyers do factor a high special tax into their offer, treating it the way they would a lower comp. Whether it moves a specific negotiation depends on the comp pool and how transparent the listing has been about the charge from the start.
San Ramon's new construction and its established master-planned resale inventory both have real advantages. The mistake is comparing them on list price and HOA dues alone, when the number that actually separates a $1.4 million new build from a $1.3 million resale home might be sitting on a tax bill neither number mentions.
If you're weighing a new build at Bishop Ranch against a resale home in Gale Ranch or Central San Ramon, Cindy Alaimo can pull the actual tax and HOA documents for specific addresses before you write an offer, not after. Schedule a Complimentary Local Market & Home Presentation Plan to see the full monthly picture, not just the list price.
