21055 Stonybrook DR
Walnut, CA, 91789
$2,200,000
5 Beds
3 Baths
3,216 SqFt
1.07 Acres
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MLS #CV26120174 image #0
Welcome to 21055 Stonybrook Rd, Walnut, CA 91789 — a rare private estate located in one of Walnut’s most desirable neighborhoods and served by the highly acclaimed Westhoff Elementary School in the award-winning Walnut Valley Unified School District.

This beautifully upgraded home features 5 spacious bedrooms, 3 bathrooms, one enormous bedroom can be either bedroom or playroom perfect for a game room, home theater, gym, or children’s entertainment space. Thoughtfully updated throughout, the home offers both comfort and functionality with an ideal layout for modern living and entertaining.

Situated behind gates for added privacy and security, the property welcomes you with a long private driveway leading to the home, creating a peaceful estate-like setting. Nestled on an expansive 1.07-acre lot, this exceptional property offers incredible space and future potential, including room for an ADU or guest house.

The resort-style backyard is truly an entertainer’s dream, featuring a large sparkling pool and spa surrounded by mature landscaping and open space. Whether hosting gatherings, relaxing with family, or enjoying the serene setting, this backyard offers endless possibilities for indoor-outdoor California living.

Rarely does a property combine privacy, acreage, luxury amenities, top-rated schools, and future expansion potential all in one exceptional offering.

Conveniently located near parks, shopping, dining, and easy freeway access, this Walnut gem truly has it all.

Don’t miss this extraordinary opportunity to own a private estate in the heart of Walnut!

Property Details

Price:
$2,200,000
MLS #:
CV26120174
Status:
Active
Beds:
5
Baths:
3
Type:
Single Family
Subtype:
Single Family Residence
Neighborhood:
668walnut
Listed Date:
Jun 16, 2026
Finished Sq Ft:
3,216
Lot Size:
46,552 sqft / 1.07 acres (approx)
Year Built:
1988
Pool668 – Walnut668walnutWalnut Valley UnifiedBack Bay

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Schools

School District:
Walnut Valley Unified

Interior

Appliances
DW, GR
Bathrooms
3 Full Bathrooms
Cooling
CA
Flooring
LAM, CARP
Heating
CF
Interior Features
CF
Laundry Features
DINC, WINC
Levels
U
Main Level Bathrooms
1
Main Level Bedrooms
1

Exterior

Attached Garage YN
1
Common Walls
NCW
Community Features
CRB
Fencing
FAIR
Garage Spaces
3
Parking Spots
3
Parking Total
3
Patio And Porch Features
NO
Security Features
AG
Spa Features
PVT
View
BK

Financial

Map

Community

Market Summary

Current real estate data for Single Family in Walnut as of Jun 17, 2026
93
Single Family Listed
71
Avg DOM
483
Avg $ / SqFt
$1,413,994
Avg List Price

Property Summary

    21055 Stonybrook DR Walnut CA is a Single Family for sale in Walnut, CA, 91789. It is listed for $2,200,000 and features 5 beds, 3 baths, and has approximately 3,216 square feet of living space, and was originally constructed in 1988. The current price per square foot is $684. The average price per square foot for Single Family listings in Walnut is $483. The average listing price for Single Family in Walnut is $1,413,994.

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21055 Stonybrook DR
Walnut, CA