Prevu by reAlpha
BuySellBlogBrowse Listings

321 Castle Crest RdAlamo, CA 94507

For Sale

$2,524,900

Smart Buyer Rebate $25,249

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.

Listed by Carolyn Gwynn

·

License #01888136

·

Compass

·

925-336-7525

Last updated September 12, 2026

·

Source: bridgeMLS #41141765

Listing Facts

  • TypeSingle-family
  • NeighborhoodWestside
  • Bedrooms5
  • Bathrooms5
  • Days on Prevu62
  • Size3,962 sqft
  • Price per sqft$637

Amenities

  • Dishwasher
  • Private Outdoor Space
  • Washer/Dryer
  • Air Conditioning
  • Parking
  • Swimming Pool

Location

Mortgage Calculator

Listing History

09/05/2026
Price Decreased
$2,524,900
08/08/2026
Price Decreased
$2,688,000
07/15/2026
Listed by Compass
$2,798,000
  1. 09/05/2026$2,524,900
    Price Decreased
  2. 08/08/2026$2,688,000
    Price Decreased
  3. 07/15/2026$2,798,000
    Listed by Compass

Property Details for 321 Castle Crest Rd

Exterior

Construction

  • Roof: Shingle
  • Stories: 2
  • Window Features: Double Pane Windows
  • Year Built: 1991
  • Architectural Style: Contemporary
  • Construction Materials: Wood Siding
  • Exterior Features: Front Yard

Features

  • Patio And Porch Features: Deck
  • View: Las Trampas Foothills, Mt Diablo, Panoramic

Measurements

  • Building Area Total: 3,962
  • Lot Features: Cul-De-Sac, Sloped Down
  • Lot Size Acres: 1.17
  • Lot Size Area: 1
  • Lot Size Square Feet: 50,965
  • Lot Size Units: Acres

Financial

Taxes

  • Parcel Number: 1883920181

Interior

Features

  • Appliances: Dishwasher, Double Oven, Gas Range, Microwave, Oven, Refrigerator, Dryer, Washer, Gas Water Heater
  • Flooring: Hardwood Flrs Throughout
  • Interior Features: Family Room, Formal Dining Room, Pantry, Updated Kitchen

Measurements

  • Living Area: 3,962
  • Living Area Units: Square Feet

Rooms

  • Bathrooms Full: 4
  • Bathrooms Partial: 1
  • Bathrooms Total Integer: 5
  • Bedrooms Total: 5
  • Rooms Total: 12

Other

Location

  • Subdivision Name: WEST SIDE ALAMO

Parking

Parking

  • Covered Spaces: 4
  • Garage Spaces: 4
  • Parking Features: Attached

Utilities

Equipment

  • Cooling: Central Air
  • Electric: Photovoltaics Seller Owned
  • Heating: Zoned
  • Has Heating: Yes
  • Laundry Features: Dryer, Laundry Room, Washer
  • Sewer: Public Sewer
  • Water Source: Public

Frequently Asked Questions

How many bedrooms and bathrooms does this single-family home have?

There are 5 bedrooms and 5 bathrooms in this single-family home at 321 Castle Crest Rd.

Does this single-family home have parking?

Yes, there are 4 parking spaces available for 321 Castle Crest Rd.

How does 321 Castle Crest Rd compare to other single-family homes in Westside?

This single-family home is listed 42% below the average price for single-family homes in Westside and has been on the market for 6 less days than the typical home in this area.

What is the square footage on this single-family home?

According to the MLS, this listing is 3,962 sqft.

321 Castle Crest Rd is a 5-bedroom, 5-bath single-family home for sale in Alamo CA 94507. Available on Prevu for 62 days at $2,524,900. This includes a recent price decrease of $163,100. This home features 3,962 square feet of living space, located in Westside. The median listing price for single-family homes in this area is $3,199,000. Additional amenities include private outdoor space, dishwasher, air conditioning, parking, swimming pool, and washer/dryer. Browse more single-family home listings in Contra Costa County.

Based on information from bridgeMLS 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 Prevu or the MLS. Information is provided exclusively for 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.

Full MLS Disclaimers

Rebate estimate is indicative only and based on listing price and estimated buyer's agent commission paid by owner, if applicable. Final rebates are subject to Terms of Use and may vary due to final negotiated transaction terms.