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7 Beds
6 Baths
5,722 sqft

$12,000,000

20 Castle CT, Hillsborough CA, 94010

Price per sqft$2,097.17
Property size5,722 sqft
Property typeResidential

Overview

Active

Listed Sep 2, 2026

Updated 4 days ago

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 ADU & pool. 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.

$79,836/mo

Est. mortgage payment based on a $12,000,000 home price.

All estimates are provided by Luxury Presence for informational purposes only. Actual amounts may vary.

Additional information

MLS® ID
82059857ML

Interior Features

Bedrooms
7
Bathrooms
6
Fireplace
Yes
Cooling
Yes
Heating
Yes
Basement
No

Exterior Features

Lot Size
0.5 Acres

Other Property Details

Association Fee Frequency
Monthly
Garage
Yes
View
Yes
Pool
Yes

Listed by Phil Chen with Christie's International Real Estate Sereno
Listing Contact: 415-271-1920 

Based on information from The MLSTM / Combined LA/Westside Multiple Listing Service, Inc. IDX information is provided exclusively for consumers' personal, non-commercial use, it may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. All information is deemed reliable but not guaranteed and should be independently reviewed and verified. Property locations as displayed on any map are best approximations only and exact locations should be independently verified. All properties are subject to prior sale, change or withdrawal, and may or may not be listed by the office/agent presenting the information. Neither listing broker(s) nor Hartleigh Haus shall be responsible for any typographical errors, misinformation, misprints and shall be held totally harmless. 

©2026 Combined L.A./Westside MLS. All rights reserved.

Data last updated 10/4/2026

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