About 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.
Open House
Features of 1720 Alameda Diablo
| MLS® # | 41148397 |
|---|---|
| Price | $6,995,000 |
| Bedrooms | 7 |
| Bathrooms | 9.00 |
| Full Baths | 6 |
| Half Baths | 3 |
| Square Footage | 8,190 |
| Acres | 1.44 |
| Year Built | 1941 |
| Type | Residential |
| Sub-Type | Single Family Residence |
| Style | Traditional |
| Status | Active |
Community Information
| Address | 1720 Alameda Diablo |
|---|---|
| Subdivision | DIABLO C.C. |
| City | Diablo |
| County | Contra Costa |
| State | CA |
| Zip Code | 94528 |
Amenities
| Parking | Attached, Garage Door Opener |
|---|---|
| # of Garages | 4 |
| Is Waterfront | No |
| Has Pool | Yes |
| Pool | Fenced, Gas Heat, In Ground, Solar Heat, Pool/Spa Combo, Outdoor Pool |
Interior
| Interior Features | Dining Area, Family Room, Formal Dining Room, Office, Storage, Workshop, Breakfast Bar, Breakfast Nook, Pantry, Updated Kitchen, Solar Tube(s) |
|---|---|
| Appliances | Dishwasher, Double Oven, Gas Range, Microwave, Oven, Range, Refrigerator, Self Cleaning Oven, Gas Water Heater |
| Heating | Zoned, Natural Gas |
| Cooling | Central Air, Whole House Fan |
| Fireplace | No |
| # of Fireplaces | 3 |
| Fireplaces | Gas, Gas Starter, Living Room, Other, Master Bedroom |
| # of Stories | 1 |
| Stories | One Story |
Exterior
| Exterior Features | Back Yard, Front Yard, Garden/Play, Sprinklers Automatic, Storage, Landscape Back, Landscape Front |
|---|---|
| Lot Description | Level, Premium Lot |
| Windows | Skylight(s) |
| Roof | Shingle |
| Construction | Wood Siding |
Additional Information
| Date Listed | September 16th, 2026 |
|---|---|
| Foreclosure | No |
| Short Sale | No |
| RE / Bank Owned | No |
Listing Details
| Agent | Margaret Combs |
|---|---|
| Office | The Agency |