Offered as a rare presale opportunity with the ability to personalize select finishes, this modern architectural masterpiece is estimated for completion in Q3 2027. Privately situated on a level half-acre cul-de-sac lot, the residence offers approximately 4,924 square feet of refined living space, including an attached JADU. A dramatic double-height foyer with a full-height porcelain slab feature wall and statement chandelier creates a striking first impression. Soaring ceilings, premium engineered oak flooring, a dramatic floating staircase, and walls of glass create a striking sense of scale and effortless indoor-outdoor living. The showpiece kitchen features custom European-inspired cabinetry with warm natural wood finishes, natural quartzite surfaces, a waterfall island, and premium Miele appliances. A private balcony, spa-inspired primary bath, custom wine display, Control4 automation, and beautifully landscaped grounds complete the residence. Buy early for preferred pricing and design personalization.
Property Details
Price:
$12,000,000
MLS #:
ML82059857
Status:
Active
Beds:
7
Baths:
7
Type:
Single Family
Subtype:
Single Family Residence
Neighborhood:
699notdefined
Listed Date:
Sep 2, 2026
Finished Sq Ft:
4,924
Lot Size:
21,787 sqft / 0.50 acres (approx)
Year Built:
2026
See this Listing
Schools
School District:
Other
Elementary School:
Other
Middle School:
Other
High School:
Burlingame
Interior
Appliances
DW, FZ, GD, RF, HOD
Bathrooms
6 Full Bathrooms, 1 Half Bathroom
Cooling
CA
Flooring
WOOD
Heating
HP
Exterior
Architectural Style
CNT, MOD
Attached Garage YN
1
Common Walls
NCW
Construction Materials
STL, CON
Garage Spaces
3
Parking Spots
3
Parking Total
3
Roof
MTL
Spa Features
IG
View
HI, WA, NE
Financial
Map
Community
- Address20 Castle CT Hillsborough CA
- CityHillsborough
- CountySan Mateo
- Zip Code94010
Market Summary
Current real estate data for Single Family in Hillsborough as of Sep 26, 2026
27
Single Family Listed
110
Avg DOM
1,744
Avg $ / SqFt
$11,271,315
Avg List Price
Property Summary
- 20 Castle CT Hillsborough CA is a Single Family for sale in Hillsborough, CA, 94010. It is listed for $12,000,000 and features 7 beds, 7 baths, and has approximately 4,924 square feet of living space, and was originally constructed in 2026. The current price per square foot is $2,437. The average price per square foot for Single Family listings in Hillsborough is $1,744. The average listing price for Single Family in Hillsborough is $11,271,315.
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20 Castle CT
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