Recently Listed Open House 10/6 5pm - 6pm
4321 Edison Street
San Mateo, CA, 94403 $ 3,595,000
Bedrooms8 Baths9.0 Sq 3,839 Monthly Estimate*
$ 22,699
Listed by Patrick Lam, CENTURY 21 Masters, patricksold@gmail.com
for $3,595,000 with 8 bedrooms and 9 full baths. This 3,839 square foot home was built in 1949 on a lot size of 0.218.
Sophisticated modern living in desirable Westwood Knolls! Situated on a quiet cul-de-sac, extensively renovated and expanded, this exceptional residence offers approx. 3,839 sq. ft. of living space with 8BD/9BA, including a newly constructed two-story rear extension, on an expansive 9,496 sq. ft. lot. The main residence features dramatic 12-ft ceilings, White Oak hardwood floors, an electric fireplace, and accordion glass doors opening to a view deck with breathtaking city and Bay views. The chefs kitchen showcases a waterfall island, quartz countertops, sleek cabinetry, and high-end Thermador appliances, including a built-in wine refrigerator. The main level offers 5BD/6BA, including 4 en-suites, plus a sunroom and family room with fireplace and wet bar. Additional highlights include multi-zone A/C and heating, ceiling speakers, and 3 decks. The downstairs legal ADU (4321A Edison St) offers separate entrance, 3BD/3BA, including 2 en-suites, an open living area, kitchen with eat-in island, sunroom, and a spacious deck. 2-car garage, tankless water heaters, plus an oversized lot with parking for 10+ vehicles, RV, & boat/trailer. Conveniently located near Hillsdale shopping, dining, Caltrain, and major freeways. A rare combination of space, views, modern luxury, and versatility!
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Open House
10/6/2026 5:00 PM - 6:00 PM
10/10/2026 2:00 PM - 4:00 PM
10/11/2026 2:00 PM - 4:00 PM
4321 Edison Street San Mateo, CA
* Some states or local ordinances may prohibit Open Houses at this time, please confirm with your Weichert agent or local rep to confirm
FeaturesGeneralLiving Area 3839
Sewer Public Sewer
Heating Central Heat Pump
Utilities Natural Gas Available
Roof Flat Shingle
Appliances Dishwasher Disposal Microwave Refrigerator Range Hood Dryer Washer
Zoning R10006
Garage Spaces 2
Patio/Porch Features Deck
Architectural Style Contemporary Modern
Construction Materials Stone
Year Built 1949
View Bay City Lights Mountain(s)
Property Subtype Single Family Residence
Accessibility None
County San Mateo
New Construction false
Property Type Residential
HOA false
Attached Garage true
Garage Y/N true
Full Baths 9
Special Listing Conditions Standard
Status Active
Directions Cross Street: 43rd Ave
City San Mateo
High School District Other
MLS Area 699 - Not Defined
Lot Size Units Square Feet
Lot Size Square Feet 9496
Property Attached Y/N false
Standard Status Active
Occupancy Type Vacant
Year Built Source Assessor
Virtual Tour https://youtu.be/L_Lt5P1OLiM
Property Sub Type Additional Single Family Residence
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InteriorInterior Amenities Breakfast Bar
Flooring Tile Wood
Fireplace Features Living Room
Total Stories 1
Common Walls No Common Walls
Air Conditioning Y/N true
Heating Y/N true
Window Features Skylight(s)
Fireplace Y/N true
Laundry Features Gas Dryer Hookup
Total Bedrooms 8
Total Baths 9
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ExteriorFencing Wood
Lot Features Sloped Down
Water Source Public
Total Parking 10
Lot Size Area 9496
Lot Size Acres 0.218
Lot Size Source Assessor
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* Excluded FeaturesList Bypatricksold@gmail.comEmail
Affordability Calculator
- Monthly Principal & Interest
- $22,699
- Monthly Property Taxes
- --
- Monthly Home Insurance
- --
Default based on a 30-year fixed rate of 6.49% 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.
Learn more about how to save NearbySingle family listings in San Mateo, CA
Average List Price $2,528,571
Percent of Sale Price 30%
About San Mateo, CA 105,907 Population
14% Since 2002
$ 102,688 Median Income
41.09 Median Age
27% Households with Children
Trends Information provided by ATTOM Data Solutions.
4827338 Elementary School
4827337 Middle School
Unknown High School High School
Pricing History| Date | Price | Price Change | Description |
|---|
| 10/4/2026 | $3,595,000 | | Listed Price |