20401 Blue Mountain Drive Walnut, CA ^$ 2,800,000

20401 Blue Mountain Drive

^$ 2,800,000

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Recently Listed

20401 Blue Mountain Drive

Walnut, CA, 91789

^$ 2,800,000

Bedrooms6 Baths5.0 Sq 6,623

Monthly Estimate*

^$ 19,339

Listed by Mercedes Barba, Exp Commercial of California, Inc., barba.mercedes@gmail.com

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Single Family Home for sale in Walnut, CA

for $2,800,000 with 6 bedrooms and 5 full baths. This 6,623 square foot home was built in 1987 on a lot size of 5.598.

Located in the Walnut Valley Unified School District and close to Mt. San Antonio College and Cal Poly Pomona, this extremely private 5.6-acre hillside estate in Walnut sits at the end of a long driveway with valley and mountain views. The two-story Spanish-style main home offers about 5,471 sq ft with 4 bedrooms, 4 baths, a dramatic atrium, formal dining room, entertainment room, billiards room, and sweeping tile throughout. A separate 1,152 sq ft guest house adds 2 bedrooms and 1 bath. Pool and spa. No HOA. Offered as-is.

Single Family Active

Price

^$ 2,800,000

Bedrooms

Full Bath

Property Type

Single Family

Taxes

^$ 0

Style

Lot Size

5.598

Year Built

1987

Town/City

Walnut

County/Region

Los Angeles

MLS | Web ID

26106361

Days on Market

Features

General

Living Area 6623

Sewer Septic Type Unknown

Heating Central

Roof Tile

Appliances Refrigerator

Zoning WAR110000*

Garage Spaces 3

Architectural Style Spanish

Pool Features In Ground Private

Construction Materials Stucco

Year Built 1987

View Hills Mountain(s) Valley

Stories Count 2

Levels Two

Property Subtype Single Family Residence

Accessibility None

County Los Angeles

New Construction false

Property Type Residential

HOA false

Garage Y/N true

Other Structures Guest House

Full Baths 5

Special Listing Conditions Standard

Status Active

Directions Take Blue Mountain Dr to the long private driveway leading up to the property.

City Walnut

Entry Location Foyer

Senior Community Y/N false

High School District Walnut Valley Unified

Lot Size Units Square Feet

Lot Size Square Feet 243849

Spa Features In Ground Private

Property Attached Y/N false

Property Condition Fixer Repairs Major

Standard Status Active

Occupancy Type Owner

Property Sub Type Additional Single Family Residence

Interior

Interior Amenities Eat-in Kitchen Atrium

Furnished Y/N Unfurnished

Fireplace Features Dining Room Guest Accommodations Library See Through

Total Stories 2

Common Walls No Common Walls

Heating Y/N true

Fireplace Y/N true

Half Baths 0

1/4 Baths 0

3/4 Baths 0

Laundry Features In Garage

Total Bedrooms 6

Total Baths 5

Exterior

Parking Features Door-Multi Driveway Garage

Lot Features Horse Property

Total Parking 0

Lot Size Area 243849

Foundation Details Slab

Spa true

Building Area Total 6623

Lot Size Acres 5.598

Private Pool true

Lot Size Source Other

Horse Y/N true

* Excluded Features

List By

Mercedes Barba

Listing Agent

Exp Commercial Of California, Inc.

Broker

barba.mercedes@gmail.com

Affordability Calculator

$19,339

Per Month

Monthly Principal & Interest: $19,339
Monthly Property Taxes: --
Monthly Home Insurance: --

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Yearly Home Insurance

Default based on a 30-year fixed rate of 7.375% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.

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Nearby

Trends
Schools

Single family listings in Walnut, CA

Average List Price ^$1,584,252

Percent of Sale Price 43%

About Walnut, CA

30,121 Population

0% Since 2002

^$98,564 Median Income

44.26 Median Age

32% Households with Children

View more area information

Trends Information provided by ATTOM Data Solutions.

4827338 Elementary School

4827337 Middle School

Unknown High School High School

See complete school information

Pricing History

Date	Price	Price Change	Description
11/11/2026	$2,800,000		Listed Price

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20401 Blue Mountain Drive, Walnut, CA, 91789 is a Single Family Home for sale at $2,800,000 with 6,623 sqft and a lot size of 5.598. 20401 Blue Mountain Drive has 6 bedrooms, 5.0 baths, and was built in 1987. The property's zip code is 91789 which is in Walnut, CA

*Information deemed reliable but not guaranteed.

Financial calculator disclaimer: Default based on a 30-year fixed rate of 7.375% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.

Listing data provided courtesy of the Internet Data Exchange Program of the California Regional Multiple Listing Service, Inc..

Based on information from California Regional Multiple Listing Service, Inc. as of 11/13/2026. This information is for your personal, non-commercial use and may not be used for any purpose other than to identify prospective properties you may be interested in purchasing. Display of MLS data is usually deemed reliable but is NOT guaranteed accurate by the MLS. Buyers are responsible for verifying the accuracy of all information and should investigate the data themselves or retain appropriate professionals. Information from sources other than the Listing Agent may have been included in the MLS data. Unless otherwise specified in writing, Broker/Agent has not and will not verify any information obtained from other sources. The Broker/Agent providing the information contained herein may or may not have been the Listing and/or Selling Agent.

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20401 Blue Mountain Drive

Single Family Home for sale in Walnut, CA

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