$12,000,000

beds

baths

half bath

5,722

square ft

20 Castle Court

Hillsborough, California 94010

New / MLS #82059857 / Single Family / Hillsborough

Listing information updated 9/3/2026 at 6:04pm

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 5,722 square feet of refined living space, including an attached JADU and detached ADU . 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 Thermador 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.

Full Features

Architecture Style:

Contemporary, ModernHighTech

Beds Above Grade:

Cooling System:

CentralForcedAir

Heating System:

Heat Pump

Appliances:

Dishwasher, Freezer, Garbage Disposal, Hood Over Range, Refrigerator, Wine Refrigerator

Main Level Primary Bedroom:

Fireplace:

Pool:

Yes

Age:

NEW

Roof Type:

Metal

Parking Type:

Garage - Attached Garage, Gate Door Opener

Parking Spaces:

Garage:

Garage - 3 Car(s)

Square Feet:

5,722

Lot Size:

21787 SquareFeet

Acreage:

0.5

Internal Features:

High Ceiling, Vaulted Ceiling, Walkin Closet

Taxes & Assessments

Tax Amount:

N/A

Tax Year:

N/A

Location

Zip Code:

94010

City:

Hillsborough

County:

San Mateo

Schools

School District(s):

Hillsborough City Elementary, San Mateo Union High

Elementary School:

West Hillsborough

Middle School:

Crocker Middle

High School:

Burlingame High

Architecture Style:

Contemporary, ModernHighTech

Beds Above Grade:

Cooling System:

CentralForcedAir

Heating System:

Heat Pump

Appliances:

Dishwasher, Freezer, Garbage Disposal, Hood Over Range, Refrigerator, Wine Refrigerator

Main Level Primary Bedroom:

Fireplace:

Pool:

Yes

Age:

NEW

Roof Type:

Metal

Parking Type:

Garage - Attached Garage, Gate Door Opener

Parking Spaces:

Garage:

Garage - 3 Car(s)

Square Feet:

5,722

Lot Size:

21787 SquareFeet

Acreage:

0.5

Internal Features:

High Ceiling, Vaulted Ceiling, Walkin Closet

Tax Amount:

N/A

Tax Year:

N/A

Zip Code:

94010

City:

Hillsborough

County:

San Mateo

School District(s):

Hillsborough City Elementary, San Mateo Union High

Elementary School:

West Hillsborough

Middle School:

Crocker Middle

High School:

Burlingame High

Listing Agent: Phil Chen

Listing Office: Christie's International Real Estate Sereno

Disclaimer: The data relating to real estate for sale on this display comes in part from the Internet Data Exchange program of the MLSListings MLS system. Real estate listings held by brokerage firms other than Christie’s International Real Estate Sereno are marked with the Internet Data Exchange icon (a stylized house inside a circle) and detailed information about them includes the names of the listing brokers and listing agents. Based on information from the MLSListings MLS as of 9/3/2026 at 6:04pm (date the MLS data was obtained). All data, including all measurements and calculations of area, is obtained from various sources and has not been, and will not be, verified by broker or MLS. All information should be independently reviewed and verified for accuracy.