1,408 Sq. Ft.
$4,190 / Sq. Ft.
1,408
Sq. Ft.
$4,190
per Sq. Ft.

Description

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...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.
  1. Listed by Owen Halliday • DRE #01453658 • Brokerage DRE #02101181 • Christie's International Real Estate Sereno • 650-492-0062

Property Details for 643 Jay Street

MLS City Name
LOS ALTOS
Building Type
Detached
Style
Ranch
Garage Spaces
2
Parking Spaces
2
Cross Street
N. Clark Ave
LISTING UPDATED: 02/18/2026 11:04 AM

Property Details for 643 Jay Street

StatusSold
MLS #ML82031048
Days on Compass8
Taxes-
HOA Fees-
Condo/Co-op Fees-
Compass TypeSingle Family
MLS TypeSingle-Family Homes / Detached
Year Built1950
Lot Size0.46 AC / 19,900 SF
CountySanta Clara County

Location

Listing Courtesy of Christie's International Real Estate Sereno, Owen Halliday, DRE #01453658

Sold By Compass, Xin Jiang, DRE #01961451

Add your commute

Building Information for 643 Jay Street

Stories1Year Built1950Building Size-Lot Size0.46 AC / 19,900 SF

Payment Calculator

$28,999 per month

30 year fixed, 6.15% Interest

Principal and Interest

$28,756

Property Taxes

$243

HOA Dues

$0

The Payment Calculator is for illustrative purposes only.

Property Information for 643 Jay Street

Features
External Links
Room Information
  • Dining Room: Dining Area
  • Family Room: Separate Family Room
  • Number of Full Bathrooms: 2
  • Number of Half Bathrooms: 1
Features
  • Fireplace: Yes
  • Fireplaces: Living Room, Wood Burning, Other
  • Fireplaces Min: 2
  • Flooring: Carpet, Other
  • Living SqFt: 1408
  • Pool: No
Utilities
  • Cooling: None
  • Heating: Central Forced Air
  • Sewer Septic: Sewer - Public
  • Utilities: Public Utilities
  • Water: Public
Garage
  • Garage and Parking: Attached Garage, Gate / Door Opener
  • Garage Max: 2
  • Garage Min: 2
Property Details
Homeowners Association
  • HOA Exists: 0
  • HOA Fee: $0
Property Details
  • Property Condition: Fixer Upper
  • Area Text: North Los Altos
  • Roof: Wood Shakes / Shingles
  • Stories: One Story
  • Subclass: Single Family Home
  • Year Built Source: Assessor
  • Street Number: 643
  • Street Name: Jay
  • Street Suffix: Street
  • Area ID: 211
Lot / Property Details
Building Information
  • Number Of Stories: 1
  • Structure SqFt: 1408
  • Structure SqFt Source: Other
  • Age: 76
Development Information
  • Zoning Detail: R1
Location Information
  • City Limits: Yes
  • Incorporated: Yes
  • Parcel Number: 170-20-056
  • County Name: Santa Clara
  • City Name: LOS ALTOS
  • City Postal ID: 28
  • Postal Code: 94022
  • Elementary School: 128
  • Elementary School District: 460
  • Middle School Text: Ardis G. Egan Intermediate
  • High School District Text: Mountain View-Los Altos Union High
  • High School Text: Los Altos High
Lot Information
  • Fencing: Fenced Back
  • Foundation: Concrete Perimeter, Concrete Slab
  • Horse Property: No
  • Lot Description: Grade - Level
  • Lot Size Area Maximum Units: Square Feet
  • Lot Size Area Minimum Units: Square Feet
  • Lot Size Source: Assessor
  • Yard Grounds: Back Yard, Balcony / Patio, Fenced

Property History for 643 Jay Street

DateEvent & SourcePriceAppreciation
Feb 17, 2026

Sold

EBRD #ML82031048

$5,900,000
Feb 17, 2026

Sold

MLSListings #ML82031048

$5,900,000
Jan 21, 2026

Pending

EBRD #ML82031048

Jan 21, 2026

Pending

MLSListings #ML82031048

Jan 14, 2026

Listed (Active)

EBRD #ML82031048

$4,995,000
Jan 13, 2026

Listed (Active)

MLSListings #ML82031048

$4,995,000
DateEvent & SourcePrice
02/17/2026

Sold

EBRD #ML82031048

$5,900,000
02/17/2026

Sold

MLSListings #ML82031048

$5,900,000
01/21/2026

Pending

EBRD #ML82031048

01/21/2026

Pending

MLSListings #ML82031048

01/14/2026

Listed (Active)

EBRD #ML82031048

$4,995,000
01/13/2026

Listed (Active)

MLSListings #ML82031048

$4,995,000

For completeness, Compass often displays two records for one sale: the MLS record and the public record.

Public Records for 643 Jay Street

Taxable ValueLand$63,733Additions$78,519Total$142,252
Tax Record2025$2,919 ($243 / month)
Home Facts
Beds3Total Finished SqFt1,408 SqFtAbove Grade Finished SqFt1,408 SqFtStories1Lot Size19,900 SqFtStyleSingle Family ResidenceYear Built1950ZoningR1CountySANTA CLARAAPN170-20-056Fireplace TypeHas Fireplace

Schools near 643 Jay Street

This home is within Los Altos Elementary School District.
Rating
School
Type
Grades
Distance
Public - K to 6
Public - 7 to 8
Public - 9 to 12
Public - 9 to 12
Rating
School
Distance
Almond Elementary School
PublicK to 6

Ardis G. Egan Junior High School
Public7 to 8

Los Altos High School
Public9 to 12

Alta Vista High School
Public9 to 12

School ratings and boundaries are provided by GreatSchools.org and Pitney Bowes. This information should only be used as a reference. Proximity or boundaries shown here are not a guarantee of enrollment. Please reach out to schools directly to verify all information and enrollment eligibility.

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Listing Courtesy of Christie's International Real Estate Sereno, Owen Halliday, DRE #01453658

Based on information from one of the following Multiple Listing Services: San Francisco Association of Realtors, the MLSListings MLS, the BAREIS MLS, the EBRD MLS, Shasta Association of REALTORS® Information being provided is for the visitor’s personal, noncommercial use and may not be used for any purpose other than to identify prospective properties visitor may be interested in purchasing. The data contained herein is copyrighted by San Francisco Association of Realtors, the MLSListings MLS, the BAREIS MLS, the EBRD MLS, Shasta Association of REALTORS® is protected by all applicable copyright laws. Any dissemination of this information is in violation of copyright laws and is strictly prohibited. Property information referenced on this web site comes from the Internet Data Exchange (IDX) program of the MLS. This web site may reference real estate listing(s) held by a brokerage firm other than the broker and/or agent who owns this web site. For the avoidance of doubt, the accuracy of all information, regardless of source, is deemed reliable but not guaranteed and should be personally verified through personal inspection by and/or with the appropriate professionals.