NOT LISTED FOR SALE

1749 Alameda Diablo Diablo, CA 94528

Diablo Area

Estimated Value: $5,645,000 - $10,132,000

6 Beds
9.5 Baths
8,010 Sq Ft
$1,030/Sq Ft Est. Value

Sale Details

Date Sold: February 12, 2026

Last sale price $11,250,000 $1,404 Per Sq Ft

Est. 27% decrease in value since last sale

Current estimated payment $50,176 / mo

4 Days on Market

Highlights

  • Gas Heated Pool
  • Custom Home
  • 36,020 Sq Ft lot
  • Green Valley Elementary School Rated A
  • Updated Kitchen
  • Family Room with Fireplace

About This Home

As of February 2026

An iconic gated estate on prestigious Alameda Diablo, offering timeless craftsmanship and refined country club living. Backing directly to the fairways of Diablo Country Club with a private entry with fountain, manicured lawn, and pergola-framed porch sets the tone. Inside, soaring 12-foot ceilings and curated interiors blend warmth and elegance. The chef’s kitchen features marble surfaces and premium appliances, opening to the family room and custom bar, ideal for entertaining. Resort-style grounds include a pool and spa, pool house with sauna, pavilion with full kitchen and fireplace, fire pit, potting shed, and expansive golf course views. The home also offers a custom wine cellar, media room, playroom, bonus room, and private office. The primary suite includes patio access, walk-in closet, and spa-like bath. An upstairs au pair suite with separate entrance provides flexibility. Prime location near Diablo Country Club, trails, downtown Danville, top-rated schools, and freeway access.

Last Agent to Sell the Property

Mary Bonham

The Agency License #01203856 Listed on: 01/28/2026

The Agency

Co-Listed By

Erin Carrigg

The Agency License #02020465

Last Buyer's Agent

Elise Fornaci

Compass License #01221087

Compass

Home Details

Home Type

  • Single Family

Year Built

  • Built in 2003

Lot Details

  • 36,020 Sq Ft Lot
  • Front Yard

Parking

  • 6 Car Direct Access Garage

Home Design

  • Custom Home
  • Composition Shingle Roof
  • Wood Shingle Exterior

Interior Spaces

  • 2-Story Property
  • Fireplace With Gas Starter
  • Family Room with Fireplace
  • 2 Fireplaces
  • Living Room with Fireplace
  • Security Gate

Kitchen

  • Updated Kitchen
  • Double Oven
  • Gas Range
  • Microwave
  • Dishwasher

Flooring

  • Wood
  • Carpet

Bedrooms and Bathrooms

  • 6 Bedrooms

Laundry

  • Dryer
  • Washer

Pool

  • Gas Heated Pool
  • Pool Cover

Utilities

  • Zoned Heating and Cooling System
  • Well
  • Gas Water Heater

Community Details

  • No Home Owners Association
  • Diablo C.C. Subdivision

Listing and Financial Details

  • Assessor Parcel Number 1951920121

Home Details

Home Type

Single Family

Year Built

Built in 2003

Lot Details

0.83 Acres

Parking

6

Listing Details

  • Stories: 2
  • Year Built: 2003
  • Property Sub Type: Detached
  • Prop. Type: Residential
  • Co List Office Mls Id: CCTHEAG
  • Subdivision Name: Diablo C.C.
  • Directions: Diablo Road to Alameda Diablo
  • Architectural Style: Custom
  • Garage Yn: Yes
  • Unit Levels: Two Story
  • New Construction: No
  • Special Features: None

Interior Features

  • Flooring: Hardwood, Carpet
  • Spa Features: Heated
  • Appliances: Dishwasher, Double Oven, Gas Range, Microwave, Refrigerator, Dryer, Washer, Gas Water Heater
  • Full Bathrooms: 9
  • Total Bedrooms: 6
  • Fireplace Features: Family Room, Gas Starter, Living Room
  • Fireplaces: 2
  • Fireplace: Yes
  • Room Kitchen Features: Dishwasher, Double Oven, Eat-in Kitchen, Gas Range/Cooktop, Kitchen Island, Microwave, Pantry, Refrigerator, Updated Kitchen

Exterior Features

  • Roof: Composition Shingles
  • Lot Features: On Golf Course, Level, Front Yard, Landscaped, Security Gate
  • Pool Features: Gas Heat, Pool Cover, Outdoor Pool
  • Pool Private: Yes
  • Construction Type: Wood Shingles
  • Property Condition: Existing

Garage/Parking

  • Garage Spaces: 6
  • Parking Features: Attached, Int Access From Garage, Side Yard Access

Utilities

  • Heating: Zoned
  • Cooling: Central Air
  • Laundry Features: Dryer, Laundry Room, Washer, Cabinets, Sink
  • Cooling Y N: Yes
  • Heating Yn: Yes
  • Electric: No Solar
  • Water Source: Public, Well

Condo/Co-op/Association

  • Association: No

Lot Info

  • Lot Size Sq Ft: 36020
  • Parcel Number: 1951920121

Ownership History

We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.

Date Name Owned For Owner Type

Purchase Details

Listed on
Jan 28, 2026
Closed on
Feb 5, 2026
Sold by
Bought by
Seller's Agent
Mary Bonham
The Agency
Buyer's Agent
Elise Fornaci
Compass
List Price
$9,750,000
Sold Price
$11,250,000
Premium/Discount to List
$1,500,000
15.38%
Views
85
Current Estimated Value
$8,249,835

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Estimated Appreciation
-$3,000,165
Avg. Annual Appreciation
-52.22%

Purchase Details

Closed on
Aug 1, 2015
Sold by
Bought by

Purchase Details

Closed on
Nov 24, 2014
Sold by
Bought by

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$990,000
Interest Rate
0.0287%
Mortgage Type
New Conventional

Purchase Details

Closed on
Mar 25, 2011
Sold by
Bought by

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$1,076,000
Interest Rate
0.0365%
Mortgage Type
Adjustable Rate Mortgage/ARM

Purchase Details

Closed on
Sep 15, 2009
Sold by
Bought by

Purchase Details

Closed on
Mar 4, 2008
Sold by
Bought by

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$1,100,000
Interest Rate
0.0562%
Mortgage Type
New Conventional

Purchase Details

Closed on
Feb 14, 2007
Sold by
Bought by

Purchase Details

Closed on
Sep 8, 2006
Sold by
Bought by

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$20,000
Interest Rate
0.0651%
Mortgage Type
Credit Line Revolving

Purchase Details

Closed on
Aug 28, 2006
Sold by
Bought by

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$20,000
Interest Rate
0.0651%
Mortgage Type
Credit Line Revolving

Purchase Details

Closed on
Aug 12, 2005
Sold by
Bought by

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$2,750,000
Interest Rate
0.0512%
Mortgage Type
New Conventional

Purchase Details

Closed on
Mar 25, 2005
Sold by
Bought by

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$3,500,000
Interest Rate
0.055%
Mortgage Type
New Conventional

Purchase Details

Closed on
Nov 30, 2004
Sold by
Bought by

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$3,000,000
Interest Rate
0.035%
Mortgage Type
New Conventional

Purchase Details

Closed on
Apr 28, 2004
Sold by
Bought by

Purchase Details

Closed on
Jan 30, 2004
Sold by
Bought by

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$3,250,000
Interest Rate
0.055%
Mortgage Type
New Conventional

Purchase Details

Closed on
Apr 16, 2002
Sold by
Bought by

Home Financials for this Owner

Home Financials are based on the most recent Mortgage that was taken out on this home.
Original Mortgage
$2,156,250
Interest Rate
0.0687%
Mortgage Type
Stand Alone First
Source: Public Records

Range of Values:

--
Value Increase
--
Percent Increase
--
Adjusted for Inflation
Collateral Analytics

Collateral Analytics Collateral Analytics AVMs (Automated Valuation Model) employ a number of statistical approaches combined with neighborhood-specific comparable selection guarantees the most up-to-date and precise valuations.

Not Available

Collateral Analytics does not have data for the current month. Please view the chart for historical values.

ICE

ICE Mortgage Technology ICE Mortgage Technology’s AVM (Automated Valuation Model) is a state-of-the-art online residential property valuation tool that provides a quick and accurate estimate of the value of almost any home in the U.S.

Not Available

ICE Mortgage Technology does not have data for the current month. Please view the chart for historical values.

First American

First American First American Data & Analytics’ next-generation AVM combines unrivaled data assets with a blended ensemble of valuation models to produce highly accurate, reliable valuations you can trust.

Not Available

First American does not have data for the current month. Please view the chart for historical values.

Quantarium

Quantarium Quantarium’s valuation service, repeatedly proven the industry’s most accurate and comprehensive, is supercharged with a self-learning and auto-tuning AI engine that continually becomes smarter and more accurate as it processes daily inputs from the industry’s leading RE data lake.

Not Available

Quantarium does not have data for the current month. Please view the chart for historical values.

Average Value
Not Available
List Price
Sold Price
Create a Home Valuation Report for This Property
The Home Valuation Report is an in-depth analysis detailing your home's value as well as a comparison with similar homes in the area

Home Values in the Area

Source: Public Records

Average Home Value in this Area

Source: Public Records

Purchase History

We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.

Date Buyer Sale Price Title Company
$11,250,000 Fidelity National Title Compan
-- None Available
-- Old Republic Title Company
-- Fidelity National Title Co
-- Fidelity National Title Co
-- Fidelity National Title Co
-- Fidelity National Title Co
-- Fidelity National Title Co
-- First American Title Company
-- First American Title Company
-- First American Title Co
-- First American Title Co
-- First American Title Co
-- First American Title
-- First American Title
-- First American Title
-- First American Title
-- First American Title
-- First American Title
-- First American Title Co
-- First American Title
$2,350,000 First American Title Company
Source: Public Records

Mortgage History

We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.

Date Status Borrower Loan Amount
Previous Owner $5,000,000
Previous Owner $990,000
Previous Owner $900,000
Previous Owner $1,076,000
Previous Owner $900,000
Previous Owner $1,100,000
Previous Owner $20,000
Previous Owner $2,980,000
Previous Owner $2,750,000
Previous Owner $3,500,000
Previous Owner $3,000,000
Previous Owner $3,250,000
Previous Owner $250,000
Previous Owner $2,156,250
Previous Owner $100,000
Source: Public Records

Property History

We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.

Date Event Price List to Sale Price per Sq Ft
02/12/2026 02/12/26 Sold $11,250,000 +15.4% $1,404 / Sq Ft
02/01/2026 02/01/26 Pending -- -- --
01/28/2026 01/28/26 For Sale $9,750,000 -- $1,217 / Sq Ft
Source: Contra Costa Association of REALTORS®

Tax History

We collect this data history from publicly available records. To have your information removed, we recommend requesting removal directly through your county’s website.

Year Tax Paid Tax Assessment Tax Assessment Total Assessment is a certain percentage of the fair market value that is determined by local assessors to be the total taxable value of land and additions on the property. Land Improvement
2026 $64,277 $6,943,999 $2,733,166 $4,210,833
2025 $64,277 $5,779,000 $2,274,621 $3,504,379
2024 $60,596 $5,686,000 $2,238,016 $3,447,984
2023 $60,596 $5,421,000 $2,133,712 $3,287,288
2022 $56,615 $4,995,500 $1,966,235 $3,029,265
2021 $54,753 $4,836,000 $1,800,000 $3,036,000
2019 $48,719 $4,241,000 $1,669,263 $2,571,737
2018 $47,499 $4,212,000 $1,657,849 $2,554,151
2017 $44,818 $4,045,000 $1,592,118 $2,452,882
2016 $43,641 $3,900,000 $1,535,046 $2,364,954
2015 -- $3,590,000 $1,413,029 $2,176,971
2014 $40,408 $3,369,000 $1,326,044 $2,042,956
Source: Public Records

Agents Affiliated with this Home

  • Mary Bonham

    Seller's Agent in 2026

    Mary Bonham

    The Agency

    (925) 997-1787

    82 Total Sales

    Mary Bonham
    Section Image
  • Erin Carrigg

    Seller Co-Listing Agent in 2026

    Erin Carrigg

    The Agency

    (925) 360-4420

    61 Total Sales

    Erin Carrigg
    Section Image
  • Elise Fornaci

    Buyer's Agent in 2026

    Elise Fornaci

    Compass

    (925) 708-0700

    64 Total Sales

    Elise Fornaci
    Section Image
See All Agents

Map

Source: Contra Costa Association of REALTORS®

MLS Number: 41122305

Contra Costa Association of REALTORS®

APN: 195-192-012-1

California Contra Costa County Diablo 94506

1749 Alameda Diablo, Diablo, CA

Disclaimer: Certain information contained herein is derived from information provided by parties other than Homes.com. All information provided is deemed reliable, but is not guaranteed to be accurate and should be independently verified.

Contra Costa Association of REALTORS® Bay East ©2026. BridgeMLS ©2026, CCAR ©2026. Information Deemed Reliable But Not Guaranteed. This information is being provided by the Bay East MLS, BridgeMLS or CCAR MLS. The listings presented here may or may not be listed by the Broker/Agent operating this website. This information is intended for the personal use of consumers, and may not be used for any purpose other than to identify prospective properties consumers may be interested in purchasing.

Nearby Homes
Your Personal Tour Guide

Ask me questions while you tour the home.