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.
Property Details
Price:
$4,995,000
MLS #:
ML82031048
Status:
Active
Beds:
5
Baths:
3
Type:
Single Family
Subtype:
Single Family Residence
Neighborhood:
699notdefined
Listed Date:
Jan 13, 2026
Finished Sq Ft:
1,408
Lot Size:
19,900 sqft / 0.46 acres (approx)
Year Built:
1950
See this Listing
Schools
School District:
Other
Elementary School:
Other
Middle School:
Other
High School:
Los Altos
Interior
Bathrooms
2 Full Bathrooms, 1 Half Bathroom
Cooling
NO
Flooring
CARP
Heating
CF
Exterior
Architectural Style
RAN
Parking Spots
2
Roof
SHN
Financial
Map
Community
- Address643 Jay ST Los Altos CA
- CityLos Altos
- CountySanta Clara
- Zip Code94022
Market Summary
Current real estate data for Single Family in Los Altos as of Jan 21, 2026
14
Single Family Listed
194
Avg DOM
1,963
Avg $ / SqFt
$5,860,921
Avg List Price
Property Summary
- 643 Jay ST Los Altos CA is a Single Family for sale in Los Altos, CA, 94022. It is listed for $4,995,000 and features 5 beds, 3 baths, and has approximately 1,408 square feet of living space, and was originally constructed in 1950. The current price per square foot is $3,548. The average price per square foot for Single Family listings in Los Altos is $1,963. The average listing price for Single Family in Los Altos is $5,860,921.
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