399 Hawthorne Avenue

Explore the potential of this approx. 10,044 SF flat lot in sought-after Los Altos, offered as land only for $4.99M or as a completed new construction home for $8.5M. The proposed two-story residence offers approx. 3,086 SF, 3 bed and 3.5 bath, plus an attached approx. 1,195 SF ADU with 2 bed and 2 bath, totaling approx. 4,281 SF of living space. The proposed plan features a dramatic two-story foyer and an open layout where the kitchen with large island, dining and living areas flow to an expansive rear deck for indoor-outdoor entertaining. The main level also offers a den with closet for a home office or guest room. The attached ADU has its own entrance, living room, kitchen, laundry, a primary suite with walk-in closet and private bath, plus a second bedroom and bath, ideal for multigenerational living or guests. Close to downtown Los Altos Village and its shops, restaurants and cafés, with easy commute access and acclaimed Los Altos schools. Buyers can personalize select design elements or enjoy the convenience of a completed home, which includes a builder warranty. Proposed plans, renderings, square footage and specifications are subject to change and final approval.

Days on Market

2 days

Current Status

Active

Original Price

$4,990,000

List Price

$4,990,000

On Market Date

Oct 30, 2026

Property Type

Single Family Home

Area

211 - North Los Altos

Zip Code

94022

MLS ID

ML82066177

APN

170-35-029

Year Built

2026

Stories in Building

2

Possession

Unavailable

Data Source

MLSL

Origin MLS System

MLSListings, Inc.

Bed

5

Bath

6 (5/1)

Parking

2

Attached Garage

SQ FT

4,281

SQ FT Source

Unavailable

Lot SQ FT

10,044.0

Lot Acres

0.230579 Acres

Cooling

Central AC

Dining Room

Dining Area

Disclosures

Natural Hazard Disclosure

Family Room

No Family Room

Foundation

Concrete Slab

Fire Place

Other

Heating

Heat Pump

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.