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$12,000,000 Just Listed

  • For Sale
  • Active
  • Single Family
  • 7 Beds
  • 6 Full Baths
  • 1 Partial Bath
  • 5,722 Sq. Ft.
  • 3 Car Garage
  • Updated 6 hours ago
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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 Property Details for 20 Castle Ct

General

  • Price: $12,000,000
  • Status: Active
  • Type: Single Family
  • Source: RE_Infolink
  • MLS ID: ML82059857
  • Updated: 9/2/2026
  • Added to Site: Today

Interior

  • Rooms/Areas: Laundry Room, Mud Room
  • Interior Features: High Ceiling , Vaulted Ceiling , Walk-In Closet
  • Fireplace(s): Other
  • Flooring: Hardwood, Wood

Rooms

Bathrooms

  • Total Bathrooms: 7
  • Full Bathrooms: 6
  • Half Bathrooms: 1
  • Bathroom Features: Double Sinks, Skylight

Bedrooms

  • Total Bedrooms: 7
  • Bedroom Features: Walk-In Closet

Other Rooms

  • Family Room: Separate Family Room
  • Kitchen: Other Countertop, Dishwasher, Freezer, Garbage Disposal, Hood over Range, Island, Pantry, Refrigerator, Wine Refrigerator
  • Laundry: Inside, Tub/Sink
  • Guest Quarters: ADU and JADU

Additional Information

  • Pool: Yes
  • Pool Description: Pool - In Ground, Pool / Spa Combo
  • Extras: Not Applicable

Parking

  • Garage Spaces: 3
  • Parking Features: Attached Garage, Gate / Door Opener

Location

  • Area: Carolands Etc.
  • County: San Mateo
  • Cross Streets: Remillard

Heating & Cooling

  • Cooling Type: Central AC
  • Heating Type: Heat Pump

Utilities

  • Sewer: Public Sewer
  • Water: Public
  • Utility Description: Natural Gas, Public Utilities, Solar Panels - Owned

Structural Information

  • Architectural Style: Contemporary, Modern / High Tech
  • Construction: Detached, Concrete , Steel, Wood Frame
  • Foundation: Concrete Perimeter and Slab, Crawlspace
  • Roof: Metal
  • Square Feet: 5,722
  • Year Built: 2026

Lot Features

  • Property View: Hills, Neighborhood, Water
  • Lot Size (Acres): 0.5002
  • Minimum Lot Size: 21787
  • Lot Size (Sq. Ft.): 21,787
  • Zoning: R10025

Green Features

  • Energy Efficient: Solar Power

Listed by Christie's International Real Estate Sereno, Phil Chen and Aspire Homes

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Listing agents

— 20 Castle Ct —

  • Phil Chen

    Christie's International Real Estate Sereno

  • Aspire Homes

Get Pre-Approved Today

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Schools serving 20 Castle Ct

School Districts:Hillsborough City Elementary School District, San Mateo Union High School District
NameGradesDistance
West Hillsborough School
376 Barbara Way, Hillsborough, CA 94010
K-50.5 mi
Crocker Middle School
2600 Ralston Avenue, Hillsborough, CA 94010
6-80.8 mi
Burlingame High School
1 Mangini Way, Burlingame, CA 94010
9-122.2 mi
Disclaimer: School attendance boundaries provided by ATTOM Data Solutions and are for reference only. Contact the school directly to verify enrollment eligibility.

Price & Sales History for 20 Castle Ct Get Price Alerts and Save Property

Date
Details
Price
Change
Source
9/02/2026
Listed
$12,000,000
160.87%
MLS
4/11/2025
Sold
$4,600,000
—
Public Record
Get Price Alerts and Save Property
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Tax History for 20 Castle Ct

Year
Property Taxes
Change
Tax Assessment
Change
2025
$51,329
—
$4,692,000
16%
2025
$51,329
7%
$4,047,000
-7%
2024
$47,815
13%
$4,350,952
2%
2023
$42,232
-18%
$4,265,640
2%
2022
$51,471
2%
$4,182,000
2%
2021
$50,415
606%
$4,100,000
1520%
2020
$7,144
4%
$253,042
2%
2019
$6,857
4%
$248,082
2%
2018
$6,565
5%
$243,218
2%
2017
$6,254
5%
$238,450
2%
2016
$5,928
5%
$233,776
2%
2015
$5,671
4%
$230,266
2%
2014
$5,460
3%
$225,756
—
2013
$5,316
—
$224,737
—
View All
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

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*These costs are estimates, and the interest rates assume exceptional credit standing.

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NMLS#: 1598647

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Listed by Christie's International Real Estate Sereno, Phil Chen and Aspire Homes

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20 Castle Ct, Hillsborough, CA 94010 (MLS# ML82059857) is a Single Family property with 7 bedrooms, 6 full bathrooms and 1 partial bathroom. 20 Castle Ct is currently listed for $12,000,000 and was received on September 02, 2026. Want to learn more about 20 Castle Ct? Do you have questions about finding other Single Family real estate for sale in Hillsborough? You can browse all Hillsborough real estate or contact a Coldwell Banker agent to request more information.

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