321 Castle Crest Rd
Alamo, CA, 94507 $ 2,524,900
Bedrooms5 Baths4.1 Sq 3,962 Monthly Estimate*
$ 15,942
for $2,524,900 with 5 bedrooms and 4 full baths, 1 half bath. This 3,962 square foot home was built in 1991 on a lot size of 1.17.
A comprehensive transformation by Alamo-based RSR Development, bringing together sophisticated design, significant structural engineering, and high-quality construction. Direct Mt. Diablo views, expansive windows, and energy efficiency. The entry pivot door sets the tone immediately, opening to the huge view-framing window capturing the mountain through floating maple stair treads. A striking architectural moment designed by noted Architect Martin Hammer. The main living level centers around an open gathering area with soaring vaulted wood ceilings, stunning kitchen representing sea, earth and sky, formal dining, exposed beams, expansive Fleetwood windows, and access to an outdoor seating area overlooking Mt. Diablo. The kitchen anchors the home with quartzite island, Wolf/Sub-Zero appliances, steam oven, custom hood and walk-in pantry. A refined mix of stone, glass, metal, and natural warmth. Extensively remodeled with an emphasis on architecture, systems, and symmetry, the home includes steel beams, double shear, owned solar, updated HVAC, maple hardwood, modern railings, upgraded lighting, and a media room / 5th bedroom. Set on 1.17 acres on one of Alamo’s friendliest streets, the flexible floor plan offers two ensuite bedrooms with one on the main level, two living areas, and easy access to two 2-car garages (total 4). Close to downtown WC, BART, Iron Horse Trail, and 680.
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FeaturesGeneralLiving Area 3962
Heating Forced Air
Cooling Central Air
Possession Close Of Escrow
Roof Shingle
Appliances Gas Water Heater Dryer Washer
Garage Spaces 4
Patio/Porch Features Deck
Architectural Style Contemporary
Pool Features None
Construction Materials Wood Siding
Year Built 1991
View Hills Mountain(s) Panoramic
Stories Count 2
Levels Two
Property Subtype Single Family Residence
County Contra Costa
New Construction false
Property Type Residential
HOA false
Attached Garage true
Subdivision Name WEST SIDE ALAMO
Garage Y/N true
Full Baths 4
Status Active
Directions Cross Street: Crest Ave.
City Alamo
Lot Size Units Square Feet
Lot Size Square Feet 50965
Listing Terms Cash Conventional
Standard Status Active
Occupancy Type Owner
Property Sub Type Additional Single Family Residence
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InteriorInterior Amenities Eat-in Kitchen
Flooring Wood
Fireplace Features None
Air Conditioning Y/N true
Heating Y/N true
Fireplace Y/N false
Half Baths 1
Total Bedrooms 5
Total Baths 5
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ExteriorParking Features Garage
Lot Features Cul-De-Sac Sloped Down Front Yard
Total Parking 4
Lot Size Area 50965
Foundation Details Raised
Lot Size Acres 1.17
Private Pool false
Lot Size Source Public Records
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* Excluded FeaturesList Bycarolyngwynn@compass.comEmail
Affordability Calculator
- Monthly Principal & Interest
- $15,942
- Monthly Property Taxes
- --
- Monthly Home Insurance
- --
Default based on a 30-year fixed rate of 6.49% with 20% down. The estimated payment is offered for convenience and is not an offer of credit. Due to market fluctuations, interest rates are subject to change at any time and without notice. Your individual rate may vary. Rates may differ for FHA, VA or jumbo loans.
Learn more about how to save NearbySingle family listings in Alamo, CA
Average List Price $4,134,975
Percent of Sale Price 64%
About Alamo, CA 14,761 Population
6% Since 2002
$ 169,385 Median Income
51.62 Median Age
37% Households with Children
Trends Information provided by ATTOM Data Solutions.
4827338 Elementary School
4827337 Middle School
Unknown High School High School
Pricing History| Date | Price | Price Change | Description |
|---|
| 9/5/2026 | $2,524,900 | -6.07% | Price Down |
| 8/8/2026 | $2,688,000 | -3.93% | Price Down |
| 7/16/2026 | $2,798,000 | | Listed Price |