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1720 Alameda Diablo, 
Diablo, CA 94528

$6,995,000


7

Beds


9

Baths


8,190

Sq Ft


Single Family

Active

Listed by

Margaret Combs

The Agency

925-575-8000

Last updated:

September 19, 2026, 12:06 AM

MLS#

41148397

Source:

CRMLS

About This Home

1720 Alameda Diablo

THE WHITE CASTLE | A RARE DIABLO LEGACY ESTATE An exceptional offering rarely seen in Diablo. Positioned on one of the community’s most coveted streets near the prestigious Diablo Country Club entrance, “The White Castle” occupies 1.44 acres of nearly flat, park-like grounds wrapped in privacy and timeless grandeur. This extraordinary 8,190 SF estate has been thoughtfully reimagined by Jacobs & Co. and Badger Construction, blending architectural scale with highly curated design and modern livability. The predominantly single-level floor plan unfolds across two private wings, offering seven bedrooms—including five en-suites—and an exceptional environment for sophisticated entertaining and multigenerational living. Highlights include a dramatic expanded entry, expansive great room, formal dining, elegant bar lounge, curated wine room, prep kitchen, redesigned mud room, tech center and two laundry rooms. The primary suite has been elevated with a newly designed bath and expanded closets. Beyond the interiors, the estate delivers a true private resort experience with a pool, spa, outdoor fireplace seating, manicured grounds, new sod, substantial storage structures and a charming children’s playhouse. A four-car garage caters beautifully to automotive enthusiasts. Owned solar serves both the home and pool, complemented by a whole-house generator.

Home Facts

Single Family

9 Baths

7 Bedrooms

Built in 1941

Subdivision & Development:

DIABLO C.C.

Price Summary

6,995,000

$854 per Sq. Ft.

MLS #:

41148397

Last Updated:

September 19, 2026, 12:06 AM

Added:

3 day(s) ago


Rooms & Interior

Bedrooms

Total Bedrooms:

7

Bathrooms

Total Bathrooms:

9

Full Bathrooms:

6

Interior

Living Area:

8,190 Sq. Ft.


Structure

Structure

Architectural Style:

Traditional

Building Area:

8,190 Sq. Ft.

Year Built:

1941


Lot

Lot Size (Sq. Ft):

62,900


Finances & Disclosures

Finances

Price:

$6,995,000

Price per Sq. Ft:

$854 per Sq. Ft.

Source:CRMLS
The information being provided by California Regional MLS (Southern California) is for the consumer's personal, non-commercial use and may not be used for any purpose other than to identify prospective properties consumer may be interested in purchasing. Any information relating to real estate for sale referenced on this web site comes from the Internet Data Exchange (IDX) program of the California Regional MLS (Southern California). Coldwell Banker Home Source is not a Multiple Listing Service (MLS), nor does it offer MLS access. This website is a service of Coldwell Banker Home Source, a broker participant of California Regional MLS (Southern California). 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. The accuracy of all information, regardless of source, including but not limited to open house information, square footages and lot sizes, is deemed reliable but not guaranteed and should be personally verified through personal inspection by and/or with the appropriate professionals. The data contained herein is copyrighted by California Regional MLS (Southern California) and is protected by all applicable copyright laws. Any unauthorized dissemination of this information is in violation of copyright laws and is strictly prohibited. Copyright 2021 California Regional MLS (Southern California). All rights reserved.
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