Every American buyer I meet arrives fluent in one number: price per square foot. It is the shorthand of the U.S. luxury market, the figure that lets a founder in Atherton compare a teardown on Selby Lane to a glass estate in Silicon Valley without ever setting foot inside. So when those same buyers begin looking at Super Cannes, the hillside above the Croisette where villas gaze down over the bay and the Estérel massif, the first question is almost always the same: how does the math compare?

Having spent years living in the Atherton area before returning home to the Riviera, I've learned that this is one of the most revealing questions a buyer can ask, and also one of the easiest to get wrong. The two markets don't just carry different prices. They measure differently, value different things, and reward different instincts.

First, a translation problem

France does not think in square feet. Every listing, every valuation, every notaire's file is expressed in square meters, and one square meter is roughly 10.76 square feet. That single conversion trips up more American buyers than any tax rule. A villa advertised at €18,000 per square meter sounds astronomical until you divide by 10.76 and arrive at something closer to €1,670 per square foot, a figure that suddenly feels familiar to anyone who has shopped the Peninsula.

There is a second subtlety. In France, the surface that matters legally is the surface Carrez, the enclosed livable area measured under specific rules that exclude terraces, basements below a certain height, and much of the outdoor space. In a region where you buy for the terrace, the pool deck, and the olive-shaded garden as much as for the interior, the official square-meter count can understate what you're actually acquiring. A Super Cannes property's real value often lives outside its Carrez surface.

Atherton: the land is the asset

Atherton is consistently ranked among the most expensive zip codes in the United States, and its pricing behaves accordingly. Entry into the market comfortably runs into eight figures, and on a per-square-foot basis the finished home frequently trades at several thousand dollars. But the number that Americans quote so confidently is, in Atherton, almost a fiction. You are rarely paying for the house. You are paying for the acre.

Much of Atherton's value is land value: proximity to Sand Hill Road, top public schools, and a one-acre-minimum zoning code that keeps the town leafy and scarce. Buyers routinely purchase a perfectly livable home and demolish it, because the dirt beneath it is the appreciating asset. Price per square foot, in that context, measures the wrapper more than the gift.

Super Cannes: buying the view, the climate, and the light

Super Cannes, together with the neighboring Californie district, is Cannes' answer to a hillside enclave: gated properties, mature Mediterranean gardens, infinity pools, and the kind of sea views that don't need a marketing brochure. Prime villas here can reach the upper tiers of the Riviera market, and the very best addresses command per-square-meter figures that, once converted, sit in a range broadly comparable to ultra-prime American markets, sometimes below them.

The crucial difference is what the price includes. In Super Cannes, that per-square-foot figure typically buys you generous land, a pool, panoramic exposure, and a climate that delivers close to three hundred days of sunshine a year. The outdoor living that an Atherton owner might build at great expense is simply the baseline expectation here. So while the headline numbers can look similar, the buyer is often acquiring a materially different lifestyle for the same math.

What a comparable budget tends to deliver

Neither is "cheaper" in a way that fits on a spreadsheet. They are simply pricing different dreams.

The currency layer most buyers overlook

For an American purchasing in euros, the exchange rate quietly rewrites every price-per-square-foot comparison. A favorable dollar can shift the effective cost of a Riviera villa by a meaningful margin between the day you make an offer and the day you sign the acte de vente. I always encourage clients to speak with a currency specialist about forward contracts rather than leaving a large cross-border purchase exposed to the spot market. It is one of the simplest ways to protect a budget, and one of the most frequently ignored.

Carrying costs change the picture again

A price-per-square-foot comparison captures the purchase, not the ownership. The two markets diverge sharply on what comes after closing. French acquisition costs, notary fees, and the annual property taxes attached to a second home follow their own logic, and the wealth-related considerations that can apply to high-value French real estate deserve careful, personalized planning well before you bid.

I keep my guidance here directional on purpose. Tax thresholds, rates, and residency rules shift, and they apply differently depending on your citizenship, your days of presence, and how you hold the property. Before you translate an Atherton budget into a Super Cannes offer, sit down with a licensed French notaire and a cross-border tax advisor who understands both systems. The right structure, decided early, can matter more to your long-term return than the per-square-foot figure that first caught your eye.

So which market wins?

It is the wrong question, and my Atherton clients are often the first to see why. In Silicon Valley, real estate is frequently a bet on scarcity and land, an asset you optimize. On the Riviera, it is a bet on how you want to live, an asset you inhabit. When the per-square-foot numbers land in the same neighborhood, as they increasingly do at the top of both markets, the real comparison isn't financial at all. It's the difference between a lot you'll rebuild and a terrace you'll never want to leave.

My job is to make that translation honest, in both directions. If you're weighing an Atherton budget against a Super Cannes address, I'd be glad to walk you through recent comparable sales in the hills above Cannes and show you exactly what your number buys here.