20401 Blue Mountain Drive
Walnut, CA 91789
Listing broker / agent: Exp Commercial of California, Inc. · Mercedes Barba · CRMLS
MLS # 26106361 · Last checked Nov 14, 2026 18:48 UTC
About this property
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.
Property details
- MLS number
- 26106361
- Status
- Active
- Type
- Residential
- Subtype
- Single Family Residence
- Beds / baths
- 6 Beds • 5 Baths
- Living area
- 6,623 (area; units unconfirmed)
- Lot size
- 5.598 acres
- County
- Los Angeles
- Year built
- 1987
- Stories
- 2
More property detailsCollapse
Listing
- Days on market
- 8
Building
- Year built
- 1987
- Architectural style
- Spanish
- Stories
- 2
- Building stories
- 2
- Levels
- Two
- Construction
- Stucco
- Roof
- Tile
- Foundation
- Slab
- Condition
- Fixer, Repairs Major
- Living area source
- Other
Bathrooms
- Full bathrooms
- 5
- Half bathrooms
- 0
- Three-quarter bathrooms
- 0
- Quarter bathrooms
- 0
Rooms & interior
- Rooms
- Atrium, Guest Quarters, Living Room
- Appliances
- Refrigerator
- Interior features
- Eat In Kitchen, Atrium
- Heating
- Central
- Fireplace
- Dining Room, Guest Accommodations, Library, See Through
- Laundry
- In Garage
- Furnishing
- Unfurnished
- Accessibility features
- None
Exterior & parking
- Total parking spaces
- 0
- Garage spaces
- 3
- Parking
- Door Multi, Driveway, Garage
- Pool
- In Ground, Private
- Spa
- In Ground, Private
- Lot features
- Horse Property
- Lot size source
- Other
- Property outlook
- Hills, Mountains, Valley
Utilities & community
- Sewer
- Septic Type Unknown
Fees & lease terms
- Association
- No
Schools reported in the listing
- High school district
- Walnut Valley Unified
School information is supplied with the listing. Confirm current attendance boundaries and enrollment eligibility directly with the school district.
Nearby public schools
Nearby does not mean assigned. These are approximate straight-line distances from the property, not walking or driving routes. Confirm attendance boundaries, enrollment eligibility, grades and current school status directly with the district.
| School / district | Grades | Distance |
|---|---|---|
| Collegewood Elementary (school website, opens in a new tab) Walnut Valley Unified · Walnut Valley | K–5 | 0.3 mi |
| Leonard G. Westhoff Elementary (school website, opens in a new tab) Walnut Valley Unified · Walnut | K–5 | 0.9 mi |
| South Hills High (school website, opens in a new tab) Covina-Valley Unified · West Covina | 9–12 | 1.6 mi |
| Mesa Elementary (school website, opens in a new tab) Covina-Valley Unified · West Covina | K–5 | 1.7 mi |
| Suzanne Middle (school website, opens in a new tab) Walnut Valley Unified · Walnut | 6–8 | 1.9 mi |
| Stanley G. Oswalt Academy Rowland Unified · Walnut | K–8 | 2.1 mi |
| Walnut High (school website, opens in a new tab) Walnut Valley Unified · Walnut | 9–12 | 2.1 mi |
| Barranca Elementary (school website, opens in a new tab) Covina-Valley Unified · Covina | K–5 | 2.1 mi |
Source: California Department of Education · 2025-26 school locations. Downloaded Oct 2, 2026 UTC. This annual snapshot may not reflect later changes. Public schools only; not a complete list of education options. No ratings or attendance assignments are provided.
Check the California School Directory ↗Price and tax history
Asking price
- Current asking price
- $2,800,000
- MLS-reported original asking price
- $2,800,000
| Observed (UTC) | Asking price |
|---|---|
| Nov 11, 2026 23:48 | $2,800,000 |
MLS values are reported for this listing, not prior sales. Observation dates show when our importer saw an asking price, not when the MLS changed it. Up to 24 observations are retained; changes between refreshes may be missed. This is not a complete price or sales history.
Property taxes
Tax history is not available from the imported listing data.
Source: MLS feed. Only supplied tax years are shown, up to 10 years; this is not a county tax archive. Amounts may be corrected and taxes may change after purchase. Verify assessments and current taxes with the county. These values do not automatically fill the payment calculator.
Market trends in Walnut
Active residential homes for sale in Walnut, CA, available through this website's authorized feed. Includes residential subtypes; excludes rentals. Not the entire market or a valuation of this property.
Observed price activity · past 30 days
20 currently active listings have an observed price-change pair ending in this period. A listing can appear in both counts.
Calculated 2026-11-14 20:10 UTC. Source: this website's authorized MLS inventory. Import progress, freshness rules and coverage affect the figures. Medians exclude missing/invalid values; price per sq ft is the median of individual listing ratios. Price observations are limited to the last 24 per listing and may miss changes between refreshes. This is not a complete 30-day market report, historical inventory trend, appreciation measure, or sold-price analysis.
Payment calculator
Explore a fixed-rate loan scenario. The price comes from this listing; a 20% down payment and 30-year term are starting assumptions, not requirements. Enter your own interest rate—not APR—and estimated costs.
Illustration only—not a rate quote, preapproval, lending offer or affordability determination. Assumes equal monthly payments on a fully amortizing fixed-rate loan; no adjustable rates, interest-only periods or balloon payments. Excludes closing costs, utilities, maintenance, special assessments and other unentered costs. Actual payments and escrow can differ. Review a Loan Estimate with your lender.
Understanding homeownership costs — CFPB ↗