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.
For sale
Price cut: $163.1K (9/5)
$2,524,900
321 Castle Crest Rd, Alamo, CA 94507
5beds
3,962sqft
Single Family Residence
Built in 1991
1.17 Acres Lot
$2,438,500 Zestimate®
$637/sqft
$-- HOA
What's special
Floating maple stair treadsQuartzite islandStunning kitchenExpansive windowsMaple hardwoodHuge view-framing windowExpansive fleetwood windows
- 62 days
- 2,486
- 136
Zillow last checked:
Listing updated:
Listed by:
Carolyn Gwynn DRE #01888136 925-336-7525,
Compass
Source: CCAR,MLS#: 41141765
Facts & features
Interior
Bedrooms & bathrooms
- Bedrooms: 5
- Bathrooms: 5
- Full bathrooms: 4
- Partial bathrooms: 1
Rooms
- Room types: 3 Bedrooms, 3 Baths, Main Entry, 1 Bedroom, 0.5 Bath, Primary Bedrm Suite - 1, Family Room
Kitchen
- Features: Stone Counters, Dishwasher, Double Oven, Eat-in Kitchen, Disposal, Gas Range/Cooktop, Kitchen Island, Microwave, Oven Built-in, Pantry, Refrigerator, Updated Kitchen
Heating
- Zoned
Cooling
- Central Air
Appliances
- Included: Dishwasher, Double Oven, Gas Range, Microwave, Oven, Refrigerator, Dryer, Washer, Gas Water Heater
- Laundry: Laundry Room
Features
- Formal Dining Room, Pantry, Updated Kitchen
- Flooring: Hardwood
- Windows: Double Pane Windows
- Has fireplace: No
- Fireplace features: None
Interior area
- Total structure area: 3,962
- Total interior livable area: 3,962 sqft
Property
Parking
- Total spaces: 4
- Parking features: Attached
- Attached garage spaces: 4
Features
- Levels: Two
- Stories: 2
- Pool features: None
- Has view: Yes
- View description: Las Trampas Foothills, Mountain(s), Panoramic
Lot
- Size: 1.17 Acres
- Features: Cul-De-Sac, Sloped Down, Front Yard
Details
- Parcel number: 1883920181
- Special conditions: Standard
Construction
Type & style
- Home type: SingleFamily
- Architectural style: Contemporary
- Property subtype: Single Family Residence
Materials
- Wood Siding
- Foundation: Raised
- Roof: Composition
Condition
- Existing
- New construction: No
- Year built: 1991
Utilities & green energy
- Electric: Photovoltaics Seller Owned
- Sewer: Public Sewer
- Water: Public
Community & HOA
Community
- Subdivision: West Side Alamo
HOA
- Has HOA: No
Location
- Region: Alamo
Financial & listing details
- Price per square foot: $637/sqft
- Tax assessed value: $1,700,679
- Date on market: 7/15/2026
Estimated market value
$2,438,500
$2.32M - $2.56M
Not available
Price history
| Date | Event | Price |
|---|---|---|
| 9/5/2026 | Price change | $2,524,900-6.1%$637/sqft |
Source:  CCAR #41141765 Report a problem | ||
| 8/8/2026 | Price change | $2,688,000-3.9%$678/sqft |
Source: CCAR #41141765 Report a problem | ||
| 7/16/2026 | Listed for sale | $2,798,000+89.7%$706/sqft |
Source: CCAR #41141765 Report a problem | ||
| 7/27/2020 | Sold | $1,475,000-6.3%$372/sqft |
Source: CCAR #40903940 Report a problem | ||
| 6/25/2020 | Pending sale | $1,575,000$398/sqft |
Source: Better Homes Realty #40903940 Report a problem | ||
| 6/3/2020 | Price change | $1,575,000-4.5%$398/sqft |
Source: Better Homes Realty #40903940 Report a problem | ||
| 5/7/2020 | Price change | $1,649,8000%$416/sqft |
Source: Better Homes Realty #40903940 Report a problem | ||
| 2/5/2020 | Price change | $1,650,000-5.7%$416/sqft |
Source: Owner Report a problem | ||
| 1/22/2020 | Price change | $1,750,000-5.4%$442/sqft |
Source: Owner Report a problem | ||
| 1/10/2020 | Listed for sale | $1,850,000+12.1%$467/sqft |
Source: Owner Report a problem | ||
| 11/22/2019 | Listing removed | $1,650,000$416/sqft |
Source: Rose Team #40853537 Report a problem | ||
| 11/12/2019 | Price change | $1,650,000+8.2%$416/sqft |
Source: Rose Team #40853537 Report a problem | ||
| 9/14/2019 | Price change | $1,525,000-2.9%$385/sqft |
Source: Rose Team #40853537 Report a problem | ||
| 7/18/2019 | Price change | $1,570,000-1.9%$396/sqft |
Source: Rose Team #40853537 Report a problem | ||
| 6/27/2019 | Price change | $1,600,000-1.5%$404/sqft |
Source: Rose Team #40853537 Report a problem | ||
| 6/7/2019 | Price change | $1,625,000-3%$410/sqft |
Source: Rose Team #40853537 Report a problem | ||
| 5/3/2019 | Price change | $1,675,000-2.9%$423/sqft |
Source: Rose Team #40853537 Report a problem | ||
| 4/10/2019 | Price change | $1,725,000-1.4%$435/sqft |
Source: Rose Team #40853537 Report a problem | ||
| 3/20/2019 | Price change | $1,749,000-2.6%$441/sqft |
Source: Rose Team #40853537 Report a problem | ||
| 2/8/2019 | Price change | $1,795,000-3%$453/sqft |
Source: Owner Report a problem | ||
| 9/25/2018 | Listed for sale | $1,850,000$467/sqft |
Source: Owner Report a problem | ||
Public tax history
| Year | Property taxes | Tax assessment |
|---|---|---|
| 2026 | -- | $1,700,679 +2% |
| 2025 | $19,389 +1.4% | $1,667,333 +2% |
| 2024 | $19,129 +2.4% | $1,634,641 +2% |
| 2023 | $18,675 +6.5% | $1,602,590 +6.5% |
| 2022 | $17,527 +2.7% | $1,504,500 +2% |
| 2021 | $17,068 +42.8% | $1,475,000 +46.8% |
| 2020 | $11,955 +1.1% | $1,004,851 +2% |
| 2019 | $11,823 +3.5% | $985,149 +2% |
| 2018 | $11,424 +1.9% | $965,833 +2% |
| 2017 | $11,216 +1.9% | $946,896 +2% |
| 2016 | $11,008 +3.5% | $928,331 +1.5% |
| 2015 | $10,637 | $914,388 +2% |
| 2014 | $10,637 | $896,477 +0.5% |
| 2013 | -- | $892,427 +2% |
| 2012 | -- | $874,929 +2% |
| 2011 | -- | $857,774 +0.8% |
| 2010 | -- | $851,364 -0.2% |
| 2009 | -- | $853,387 +2% |
| 2008 | -- | $836,655 +2% |
| 2007 | -- | $820,251 +2% |
| 2006 | -- | $804,169 +2% |
| 2005 | -- | $788,402 +2% |
| 2004 | -- | $772,944 +1.9% |
| 2003 | -- | $758,779 +2% |
| 2002 | -- | $743,902 +2% |
| 2001 | -- | $729,316 |
Find assessor info on the county website
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Neighborhood: 94507
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