At the end of a quiet cul-de-sac in Hillsborough, California sits a new construction opportunity unlike anything else currently on the market: 20 Castle Ct, a modern architectural masterpiece now offered in presale, with an estimated completion of Q3 2027.
Hillsborough's reputation for privacy and prestige isn't marketing language — it's a century of history. The town has been home to entertainer Bing Crosby, publishing magnate William Randolph Hearst, Tonga's King George Tupou V, and wellness entrepreneur Jenny Craig, alongside former MLB stars J.T. Snow, Rickey Henderson, and Greg Maddux. Today that legacy continues: Franklin Resources chairman Charles B. Johnson, among the wealthiest people on the Peninsula, calls Hillsborough home as well. With no commercial zoning, some of the largest minimum lot sizes on the Peninsula, Hillsborough remains one of the few places within twenty minutes of Silicon Valley and San Francisco where true privacy is still possible.
The Residence
Privately situated on a level half-acre lot at the end of the cul-de-sac — a position that shields the estate from through-traffic and affords a rare degree of seclusion even by Hillsborough standards — 20 Castle Ct offers approximately 5,722 square feet of refined living space across 7 bedrooms and 7 bathrooms.
A dramatic double-height foyer, anchored by a full-height porcelain slab feature wall and a statement chandelier, sets the tone from the moment you step inside. Soaring ceilings, premium engineered oak flooring, a floating staircase, and walls of glass carry that same sense of scale through the home, blurring the line between indoor and outdoor living.
The kitchen is the heart of the home: custom European-inspired cabinetry in warm natural wood, natural quartzite surfaces, a waterfall island, and a full suite of premium Miele appliances make it as functional as it is striking. A private balcony, spa-inspired primary bath, custom wine display, and whole-home Control4 automation complete a residence built for both everyday living and effortless entertaining.
Built for the Way Modern Families Actually Live
What sets 20 Castle Ct apart from most new construction at this level is its living arrangement: the home includes both an attached junior ADU (JADU) and a fully detached ADU, in addition to the main residence. For families who employ a live-in nanny or housekeeper, host extended family for long stretches, or simply want guests to have their own private space and entrance, this is a rare configuration — true multigenerational or staffed-household living, without anyone feeling like a guest in someone else's home.
A Presale Opportunity, With Real Advantages
Because 20 Castle Ct is still in its presale stage, qualified buyers have the opportunity to personalize select finishes — a level of input almost never available once a luxury new-construction home is complete. Buyers who commit early also secure preferred presale pricing ahead of the Q3 2027 completion date.
For a private tour, floor plans, or to discuss presale terms and finish personalization for 20 Castle Ct, contact Buyer Specialist in San Francisco Bay Area: Vicki Wong at vickiwongrealtor@gmail.com or (650) 394-5303.
Vicki Wong, DRE #02234809, eXp Realty of California