643 Jay Street

• Fri Jan 16, 9:30 am - 1:00 pm

  Exceptional Land-Value Opportunity. Expansive 19,900 (appr.) Sq Ft lot.

• Fri Jan 16, 4:00 pm - 6:00 pm

  Twilight Tour: Exceptional Land-Value Opportunity. Expansive 19,900 (appr.) Sq Ft lot.

• Sat Jan 17, 2:00 pm - 4:00 pm

  Exceptional Land-Value Opportunity. Expansive 19,900 (appr.) Sq Ft lot.

• Sun Jan 18, 2:00 pm - 4:00 pm

  Exceptional Land-Value Opportunity. Expansive 19,900 (appr.) Sq Ft lot.

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.

Days on Market

2 days

Current Status

Active

Original Price

$4,995,000

List Price

$4,995,000

On Market Date

Jan 13, 2026

Property Type

Single Family Home

Area

211 - North Los Altos

Zip Code

94022

MLS ID

ML82031048

APN

170-20-056

Year Built

1950

Stories in Building

1

Possession

COE

Data Source

MLSL

Origin MLS System

MLSListings, Inc.

Bed

5

Bath

3 (2/1)

Parking

4

Attached Garage, Gate / Door Opener

SQ FT

1,408

SQ FT Source

Unavailable

Lot SQ FT

19,900.0

Lot Acres

0.456841 Acres

Cooling

None

Dining Room

Dining Area

Disclosures

Natural Hazard Disclosure, NHDS Report

Family Room

Separate Family Room

Flooring

Carpet, Other

Foundation

Concrete Perimeter, Concrete Slab

Fire Place

Living Room, Wood Burning, Other

Heating

Central Forced Air

Possession

COE

Architectural Style

Ranch

Fee

Unavailable

MLS and other Information regarding properties for sale as shown in Theo have been obtained from various sources such as sellers, public records, agents and other third parties. This information may relate to the condition of the property, permitted or unpermitted uses, zoning, square footage, lot size/acreage or other matters affecting value or desirability. Unless otherwise indicated in writing, neither brokers, agents nor Theo have verified, or will verify, such information. If any such information is important to buyer in determining whether to buy, the price to pay or intended use of the property, buyer is urged to conduct their own investigation with qualified professionals, satisfy themselves with respect to that information, and to rely solely on the results of that investigation.

School data provided by GreatSchools. School service boundaries are intended to be used as reference only. To verify enrollment eligibility for a property, contact the school directly.