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$4,995,000
4 Days On Site

643 Jay Street
LOS ALTOS, CA 94022

For Sale|Single Family Residence|Active
5
Beds
2.5
Total Baths
2
Full Baths
1
Partial Bath
1,408
SqFt
$3,548
/SqFt
1950
Built
County:
Santa Clara
Listed by of Owen Halliday of Christie's International Real Estate Sereno (650) 492-0062
Upcoming Open Houses
Sat, Jan 17, 12:00 PM - 2:00 PM
Sat, Jan 17, 2:00 PM - 4:00 PM
Sun, Jan 18, 2:00 PM - 4:00 PM
643 Jay Street643 Jay Street643 Jay Street643 Jay Street
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Monthly Payment (Est.)

$22,789
Calculator powered by Showcase IDX, a Constellation1 Company. Copyright ©2026 Information is deemed reliable but not guaranteed.

First time on the market in more than 50 years. An exceptional land-value opportunity in one of Los Altos most coveted neighborhoods. Set on an impressive 19,900 (appr.) SF parcel, this tranquil property offers a rare canvas for builders, investors, or visionary buyers seeking to create a custom estate in a truly special location. The existing residence consists of a 3-bedroom, 1.5-bath main home, complemented by an independent in-law unit with 2 bedrooms, a full bath, a generous living area, and a kitchenette - for a total of 5 bedrooms, 2 full and 1 half baths. While the structures are ready for transformation, the true value lies in the expansive lot, tranquil setting, and exceptional location. The oversized grounds present abundant possibilities for new construction, thoughtful expansion, or a complete reimagining of the property, subject to buyer verification. Mature surroundings and a spacious footprint provide the ideal foundation for a future luxury residence with ample outdoor living. Just minutes from top-rated Los Altos schools (Almond Elementary, Egan Middle, and Los Altos High), downtown shops and dining, parks, and major Silicon Valley commute routes, this is a rare opportunity to secure a large parcel in a premier location and bring a bold vision to life.

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Listing Snapshot
Price 
$4,995,000
Days On Site 
4 Days
Bedrooms 
5
Inside Area (SqFt) 
1,408 sqft
Total Baths 
2.5
Full Baths 
2
Partial Baths 
1
Lot Size 
N/A
Year Built 
1950
MLS® Number 
ML82031048
Status 
Active
Property Tax 
N/A
HOA/Condo/Coop Fees 
N/A
Sq Ft Source 
N/A
Friends & Family
Recent Activity
12 hours agoListing updated with changes from the MLS®
4 days agoListing first seen on site
General Features
Attached Garage 
Yes
Cross Street 
N. Clark Ave
Disclosures 
Natural Hazard DisclosureNHDS Report
Foundation 
Concrete Perimeter
Garage 
Yes
Garage Spaces 
2
Number Of Stories 
1
Parking 
AttachedGarage Door Opener
Parking Spaces 
2
Property Condition 
Fixer
Property Sub Type 
Single Family Residence
Sewer 
Public Sewer
SqFt Total 
1408
Style 
Ranch
Water Source 
Public
Zoning 
R1
Interior Features
Fireplace 
Yes
Fireplace Features 
Living RoomWood BurningOther
Fireplaces 
2
Flooring 
CarpetOther
Heating 
Forced AirCentral
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Exterior Features
Exterior 
Balcony
Fencing 
FencedBack Yard
Lot Features 
LevelBack Yard
Patio And Porch 
Patio
Pool Features 
None
Roof 
Wood
Community Features
School District 
Mountain View-Los Altos Union High
Schools
School District
Mountain View-Los Altos Union High
Elementary School
Almond Elementary
Middle School
Ardis G. Egan Intermediate
High School
Los Altos High
Listed by of Owen Halliday of Christie's International Real Estate Sereno (650) 492-0062



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: 2026-01-17 08:21 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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