A 1960 Mid-Century Modern house at 3907 Happy Valley Road in Lafayette — where the swimming pool originates inside the dining room and flows into the backyard — has listed for the first time since 1967, asking $4,450,000. Its current property taxes: $3,485 a year.

At the end of a private cul-de-sac on Happy Valley Road in Lafayette, a house is for sale for the first time since 1967. The asking price is $4,450,000. The annual property taxes are $3,485.

The number is worth sitting with. The house at 3907 Happy Valley Road last changed hands nearly six decades ago, when Proposition 13 did not yet exist and Contra Costa County's assessed values were calibrated to a different Bay Area. The current owner has been paying a tax bill anchored to that era ever since. Whoever buys the property next will pay — for the first time since the Johnson administration — an assessment set closer to what the land is actually worth.

The house was built in 1960 and listed on May 18 as MLS #41135177, held by Ann Newton Cane of Golden Gate Sotheby's International Realty (DRE #02084093). Five bedrooms, four bathrooms, 3,890 square feet of living space on 0.75 acres. A detached 665-square-foot ADU and a three-car garage on the grounds. A year-round creek, two garden courtyards, and mature oak and redwood trees — grounds that the listing says have appeared in Sunset, Better Homes and Gardens, and HGTV, with a trailhead into Briones Regional Park at the end of the road.

And a pool that begins inside the dining room.

It runs beneath a walkway and continues out into the backyard, functioning as both an indoor and outdoor pool from a single body of water. Whether this was original to the 1960 design or added later — Redfin records a 1965 alteration; no other source corroborates that date — is unclear from any available public document. The original architect is not named in the listing or in any county record found online. What is verifiable: the pool is in the dining room, it passes beneath a walkway, and it exits through the back of the house.

At $4,450,000, the ask comes to $1,144 per square foot — roughly 71 percent above Lafayette's overall median of $667. The Happy Valley neighborhood median sale price hit $2,795,000 in January 2026, up 23.8 percent year over year; Upper Happy Valley reached $3.8 million in March. The property carries APN 2461200145 in Contra Costa County records.

As of late June, MLS #41135177 remains active. The cul-de-sac ends at the property line.