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1720 Alameda DiabloDiablo, CA 94528

DIABLO C.C. · Contra Costa County

$6,995,000List price
7Beds
7.5Baths
8,190Sq Ft
1941Year built
1.44Acre lot
4Garage
2 days agoOn market

Description

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.

Property Information

Property type
Residential
Sub-type
Single Family Residence
Style
Traditional
Year built
1941
Living area
8,190 Sq Ft
Lot size
1.44 acres
Garage spaces
4
Parking spaces
4
Days on market
2
MLS® Listing#
41148397

Property Features

Interior
Breakfast Bar · Eat-in Kitchen
Exterior
Garden
Appliances
Gas Water Heater
Cooling
Central Air · Whole House Fan
Heating
Forced Air · Natural Gas
Flooring
Carpet · Tile · Wood
Fireplace
Gas · Gas Starter · Living Room · Master Bedroom
Pool
Gas Heat · In Ground · Solar Heat
Parking
Attached · Garage · Garage Door Opener
Patio
Patio
Lot features
Back Yard · Front Yard · Garden
Construction
Wood Siding
Roof
Shingle
Other structures
Storage · Workshop

Rooms

  • Bathroom
  • Bonus Room
  • Family Room
  • Kitchen
  • Office
  • Workshop

Financial Details

HOA
None
Parcel number
1951520038

Directions

Cross Street: Diablo Road.

Open Houses

Listing Courtesy: The Agency - 9255758000

Presented by: Margaret Combs

Based on information from California Regional Multiple Listing Service, Inc. as of 2026-09-16T00:00:00.000Z 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.

Licensed in the state of California.

Diablo Market Statistics

How this home compares to 16 active listings in Diablo, CA

Diablo medianThis listing
Median listing price$1,000,000+$6,995,000
Median days on market262
Median Sq Ft5,0848,190
Median price / Sq Ft$968$854

Market statistics compiled from active EXIT Realty® and MLS listings in Diablo, CA.

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