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$3,595,000
10 Days On Site

4321 Edison Street
San Mateo, CA 94403

For Sale|Single Family Residence|Active
8
Beds
9
Total Baths
9
Full Baths
3,839
SqFt
$936
/SqFt
1949
Built
County:
San Mateo
Listed by of Patrick Lam of CENTURY 21 Masters (415) 710-3704
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4321 Edison Street4321 Edison Street4321 Edison Street4321 Edison Street
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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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Listing Snapshot
Price 
$3,595,000
Days On Site 
10 Days
Bedrooms 
8
Inside Area (SqFt) 
3,839 sqft
Total Baths 
9
Full Baths 
9
Partial Baths 
N/A
Lot Size 
0.218 Acres
Year Built 
1949
MLS® Number 
ML82063527
Status 
Active
Property Tax 
N/A
HOA/Condo/Coop Fees 
N/A
Sq Ft Source 
N/A
Friends & Family
Recent Activity
14 hours agoListing updated with changes from the MLS®
2 weeks agoListing first seen on site
General Features
Acres 
0.218
Attached Garage 
Yes
Cross Street 
43rd Ave
Disclosures 
Natural Hazard Disclosure
Foundation 
Concrete Perimeter
Garage 
Yes
Garage Spaces 
2
Number Of Stories 
1
Parking 
AttachedEnclosedOversized
Parking Spaces 
10
Property Sub Type 
Single Family Residence
Security 
Closed Circuit Camera(s)
Sewer 
Public Sewer
SqFt Total 
3839
Style 
ContemporaryModern / High Tech
Utilities 
Natural Gas Available
Water Source 
Public
Zoning 
R10006
Interior Features
Appliances 
DryerDisposalDishwasherMicrowaveRefrigeratorRange HoodElectric RangeWasher
Cooling 
Zoned
Electric 
220 Volts in Kitchen
Fireplace 
Yes
Fireplace Features 
See ThroughLiving RoomOther
Fireplaces 
1
Flooring 
VinylHardwoodTile
Heating 
Forced AirZonedHeat PumpCentral
Interior 
Breakfast BarMaster Downstairs
Laundry Features 
Gas Dryer HookupSink
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Exterior Features
Construction Details 
Stone
Exterior 
Balcony
Fencing 
FencedOtherWood
Lot Features 
SlopedViewsSloped DownBack Yard
Patio And Porch 
DeckPatio
Pool Features 
None
Roof 
FlatShingle
View 
BayMountain(s)City Lights
Waterview 
BayMountain(s)City Lights
Community Features
School District 
San Mateo Union High
Schools
School District
San Mateo Union High
Elementary School
Unknown
Middle School
Unknown
High School
Unknown
Listed by of Patrick Lam of CENTURY 21 Masters (415) 710-3704



The data relating to real estate for sale on this display comes in part from the Internet Data Exchange program of the MLSListings™ MLS system. Real estate listings held by brokerage firms other than eXp Realty are marked with the Internet Data Exchange icon and detailed information about them includes the names of the listing brokers and listing agents. IDX information is provided exclusively for personal, non-commercial use, and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. Information is deemed reliable but not guaranteed. Copyright 2026, MLS Listings, Inc..
Last checked: 2026-10-14 05:36 PM UTC

Neighborhood & Commute
Source: Walkscore
Disclosure: Community information and market data powered by Constellation Data Labs. Information is deemed reliable but not guaranteed.
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