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643 Jay St
For Sale $4,995,000 ($3,547.59 per Sq Ft)
$4,995,000 ($3,547.59 per Sq Ft)
- 5 Bedrooms
- 3 Bathrooms
- 1,408 Sq Ft
- 19,900 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 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.
Amenities
Garage
Pool
Garden
Security System
Internet
Telephone
Heating
Fireplace
Balcony & Patio
TV / Cable
Laundry
Hardwood Floors
Spa
Air Conditioning
Solar Power
Floor Plan
Great Views
Natural Light
Quiet
Water View
Elevator
Guest Unit(s)
Furnished
220 Volt
Property Details
| List Price | $4,995,000 |
| Property Type | Single Family Homes |
| Usable Sqft | 1,408 |
| Number of Stories | 1 stories |
| Parking Spots | 2 spots |
| Year Built | 1950 |
| Last Sold | Unknown |
| Sold Price | Unknown |
| APN # | 17020056 |
| MLS # | ML82031048 |
| Property ID | 322509469 |
| Lot Sqft | 19,900 |
| Zoning | R1 |
| Days on Market | 8 |
| Original List Price | $4,995,000 |
| Date Updated | January 19, 2026 |
| Date Created | January 13, 2026 |
Listing Provided By
Owen Halliday an agent of . Lic #01453658
© 2026 CRMLS. All rights reserved. Some listings on this website are from CRMLS as of January 19, 2026 The information being 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.
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Robert Crawford
REAL ESTATE AGENT