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643 Jay Street, 
Los Altos, CA 94022

$4,995,000


5

Beds


3

Baths


1,408

Sq Ft


Single Family


Virtual Tour

Active

Listed by

Owen Halliday

Christie'S International Real Estate Sereno

650-947-2900

Last updated:

January 18, 2026, 08:10 PM

MLS#

ML82031048

Source:

CRMLS

About This Home

643 Jay Street

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.

Home Facts

Single Family

3 Baths

5 Bedrooms

Built in 1950

Price Summary

4,995,000

$3,547 per Sq. Ft.

MLS #:

ML82031048

Last Updated:

January 18, 2026, 08:10 PM

Added:

5 day(s) ago


Rooms & Interior

Bedrooms

Total Bedrooms:

5

Bathrooms

Total Bathrooms:

3

Full Bathrooms:

2

Interior

Living Area:

1,408 Sq. Ft.


Structure

Structure

Architectural Style:

Ranch

Building Area:

1,408 Sq. Ft.

Year Built:

1950


Lot

Lot Size (Sq. Ft):

19,898


Finances & Disclosures

Finances

Price:

$4,995,000

Price per Sq. Ft:

$3,547 per Sq. Ft.

Source:CRMLS
Based on information from California Regional Multiple Listing Service, Inc. as of January 18, 2026 . This information is for your personal, non-commercial use and may not be used for any purpose other than to identify prospective properties you may be interested in purchasing. Display of MLS data is usually deemed reliable but is NOT guaranteed accurate by the MLS. Buyers are responsible for verifying the accuracy of all information and should investigate the data themselves or retain appropriate professionals. Information from sources other than the Listing Agent may have been included in the MLS data. Unless otherwise specified in writing, Broker/Agent has not and will not verify any information obtained from other sources. The Broker/Agent providing the information contained herein may or may not have been the Listing and/or Selling Agent. The information provided is for consumers' personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing. All properties are subject to prior sale or withdrawal. All information provided is deemed reliable but is not guaranteed accurate, and should be independently verified.

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Contact an Agent

Yes, I would like more information. Please use and/or share my information with a Coldwell Banker ® affiliated agent to contact me about my real estate needs. By clicking Contact, I request to be contacted by phone or text message and consent to being contacted by automated means. I understand that my consent to receive calls or texts is not a condition of purchasing any property, goods, or services. Alternatively, I understand that I can access real estate services by email or I can contact the agent myself.

If a Coldwell Banker affiliated agent is not available in the area where I need assistance, I agree to be contacted by a real estate agent affiliated with another brand owned or licensed by Anywhere Real Estate (BHGRE®, CENTURY 21®, Corcoran®, ERA®, or Sotheby's International Realty®). I acknowledge that I have read and agree to the terms of use and privacy notice.