BG

1720 Alameda Diablo

Diablo, CA 94528

$6,995,000 $854 / sqft Est. $35,371/mo

7
Beds
9
Baths
8,190
Sq Ft

Active 3 days on market

Listed By Margaret CombsDRE #01361329

The Agency

Your inquiry will go to Brenda Geraci, who is not the listing agent for this property.

Lot Size
62,901 sqft
Year Built
1941
Property Type
Residential
Property Subtype
Single-family home
Levels
One
Stories
1
Garage Spaces
4
Pool
No
HOA
No
Days on Market
3 days
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.

Estimate a monthly payment

/mo

Principal and interest only. Property taxes, insurance and any HOA dues are not included and will increase this amount.

Estimates only, for your own planning. Not a loan offer, a pre-qualification, or a quote from any lender.

Features

Interior Features

Interior
  • Breakfast Bar
  • Breakfast Area
  • Eat In Kitchen
  • Workshop
Appliances
  • Gas Water Heater
Cooling
  • Central Air
  • Whole House Fan
Heating
  • Forced Air
  • Natural Gas
Fireplace
  • Gas
  • Gas Starter
  • Living Room
  • Primary Bedroom
Flooring
  • Carpet
  • Tile
  • Wood

Exterior Features

Lot
  • Back Yard
  • Front Yard
  • Garden
  • Sprinklers Timer
  • Street Level
Pool
  • Gas Heat
  • In Ground
  • Solar Heat
Parking
  • Garage
  • Garage Door Opener
Roof
  • Shingle

Market insights

Computed from CRMLS data for Diablo.

Property history

No prior MLS sale records.

Based on information from California Regional Multiple Listing Service, Inc. as of September 21, 2026 at 12:00 AM PDT and /or other sources. All data, including all measurements and calculations of area, is obtained from various sources and has not been, and will not be, verified by broker or MLS. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information. Any amount of compensation or commission stated is made only to participants of CRMLS or an MLS that has entered into a datashare agreement with CRMLS.

Where it is