OFF MARKET

Off Market Nov 2010 for $281K

$675,299

Est. refi paymentEst. refi $1,858/mo

•

2,562

sq ft

3447 Keystone Loop, Discovery Bay, CA 94514

About this home

Single-familyProperty Type

2003Year Built

6,500 sq ftLot Size

$264Est. Price/Sq.Ft.

2 car garageParking

Listed by Maureen Prince •DRE #01196634 • Marples & Associates REALTORS

Bought with Esther Kennedy •DRE #01483022 • Homesmart Optima Realty

Redfin checked: a minute ago

•Source:bridgeMLS, Bay East AOR, or Contra Costa AOR #40454462

Redfin Estimate

$675,299

$394K since sold in November 2010$8,000 since August

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 7.6% lower than the average sale price ($731K) of 6 comparable homes.

SOLD JUN 18, 2026
$690,000
A
4 beds3 baths2,302 sq ft
2072 Bridgeport Loop, Discovery Bay, CA 94505
SOLD AUG 18, 2026
$680,000
B
4 beds2.5 baths2,613 sq ft
2466 Yosemite Way, Discovery Bay, CA 94505
SOLD MAY 19, 2026
$800,000
C
4 beds3 baths2,913 sq ft
2350 Winchester Loop, Discovery Bay, CA 94505
SOLD MAR 5, 2026
$730,000
D
4 beds3 baths2,913 sq ft
2342 Winchester Loop, Discovery Bay, CA 94505
SOLD SEP 4, 2026
$745,000
E
4 beds3 baths2,704 sq ft
1525 Coleridge Way, Discovery Bay, CA 94505
BOUGHT WITH REDFIN JUN 15, 2026
$740,000
F
4 beds3.5 baths3,097 sq ft
327 Mendocino Way, Discovery Bay, CA 94505
Iron Valley Real Estate NorCal, Iron Valley Real Estate NorCal

Claim this home to receive a free report every month with insights on the changing estimate.

Earn from this home

Sell

$500,319

Est. take-home

List your home with Redfin and save $3,376

Refinance

Est. cash available

Get cash now or lower your monthly rate

Rent

$3,642/mo

Redfin rental estimate

List your home for rent

Market trends in 94505, CA

Last updated August 2026

Buyer's Market

Seller's Market

Seller's market

Sale-to-List Price

97.7%

0.6% MoM

Median sale price

$792K

$8K MoM

Avg. days on market

34d

7 days MoM

Recently sold homes

2 MoM

New listings for sale

OPEN SAT, 1PM TO 4PM
$835,000
3 beds2.5 baths2,330 sq ft
7364 Bay Harbor Way, Discovery Bay, CA 94505
OPEN SAT, 1PM TO 4PM
$849,000
4 beds3 baths3,367 sq ft
453 Emerson Ct, Discovery Bay, CA 94505
OPEN SAT, 1PM TO 4PM
$979,000
4 beds3 baths2,263 sq ft
9133 Calypso Ct, Discovery Bay, CA 94505
Coldwell Banker Realty, Coldwell Banker Realty
COMING SOON
$799,000
3 beds2 baths2,168 sq ft
4681 Spinnaker Way, Discovery Bay, CA 94505
$818,000
4 beds2.5 baths2,340 sq ft
7295 Keyesport Way, Discovery Bay, CA 94505
OPEN SAT, 12PM TO 3:30PM
$745,000
4 beds3 baths2,432 sq ft
3694 Otter Brook Loop, Discovery Bay, CA 94505
$1,250,000
4 beds3 baths2,636 sq ft
4880 Discovery Pt, Discovery Bay, CA 94505
OPEN SAT, 1PM TO 3PM
$685,000
4 beds2.5 baths1,706 sq ft
3524 Sailboat Dr, Discovery Bay, CA 94505
$689,000
4 beds3 baths2,562 sq ft
6171 Seneca Cir, Discovery Bay, CA 94505
$682,500
4 beds2 baths1,760 sq ft
2419 Imperial Ct, Discovery Bay, CA 94505
See all

Provided by Redfin

Sale history for 3447 Keystone Loop

Date

Event

Price

bridgeMLS, Bay East AOR, or Contra Costa AOR #40454462

Dec 14, 2010

Sold

$281,000

$110/sq ft

Sep 2, 2010

Pending

—

Jul 18, 2010

Relisted

—

Jun 23, 2010

Pending

—

May 24, 2010

Price Changed

$275,000

$107/sq ft

May 24, 2010

Relisted

—

Mar 8, 2010

Listing Removed

—

Mar 8, 2010

Listed

$259,900

$101/sq ft

bridgeMLS, Bay East AOR, or Contra Costa AOR #40313565

Feb 6, 2008

Sold

$395,000

$154/sq ft

Dec 23, 2007

Listing Removed

—

Dec 12, 2007

Listed

$397,500

$155/sq ft

bridgeMLS, Bay East AOR, or Contra Costa AOR #40231475

Jan 11, 2007

Listing Removed

—

Dec 27, 2006

Listed

Year

Property tax

Land + Additions

Assessment*

2025

$6,054 (+5.9%)

$29,396 + $337,802

$367,198

2024

$5,715 (+1.6%)

$28,820 + $331,179

$359,999

2023

$5,624 (+1.7%)

$28,255 + $324,686

$352,941

2022

$5,529 (+2.4%)

$27,701 + $318,320

$346,021

2021

$5,402 (+0.6%)

$27,158 + $312,079

$339,237

2020

$5,368 (+1.4%)

$26,626 + $305,960

$332,586

2019

$5,294 (+4.2%)

$26,353 + $302,823

$329,176

2018

$5,083 (+0.8%)

$25,837 + $296,886

$322,723

2017

$5,041 (+6.3%)

$24,835 + $285,358

$310,193

2016

$4,744 (+3.3%)

$24,835 + $285,358

$310,193

2015

$4,591 (+2.0%)

$24,349 + $279,763

$304,112

2014

$4,502 (+5.8%)

$23,515 + $270,164

$293,679

2013

$4,256 (−2.6%)

$23,515 + $270,164

$293,679

2012

$4,368 (+1.4%)

$21,940 + $252,060

$274,000

2011

$4,309 (+3.4%)

$22,820 + $262,180

$285,000

2010

$4,167 (+1.2%)

$22,500 + $258,500

$281,000

2009

$4,116 (−25.3%)

$47,335 + $229,665

$277,000

2008

$5,510

$47,592 + $230,908

$278,500

Tax history for 3447 Keystone Loop

Year

Property tax

Land + Additions

Assessment*

2025

$6,054 (+5.9%)

$29,396 + $337,802

$367,198

2024

$5,715 (+1.6%)

$28,820 + $331,179

$359,999

2023

$5,624 (+1.7%)

$28,255 + $324,686

$352,941

2022

$5,529 (+2.4%)

$27,701 + $318,320

$346,021

2021

$5,402 (+0.6%)

$27,158 + $312,079

$339,237

2020

$5,368 (+1.4%)

$26,626 + $305,960

$332,586

2019

$5,294 (+4.2%)

$26,353 + $302,823

$329,176

2018

$5,083 (+0.8%)

$25,837 + $296,886

$322,723

2017

$5,041 (+6.3%)

$24,835 + $285,358

$310,193

2016

$4,744 (+3.3%)

$24,835 + $285,358

$310,193

2015

$4,591 (+2.0%)

$24,349 + $279,763

$304,112

2014

$4,502 (+5.8%)

$23,515 + $270,164

$293,679

2013

$4,256 (−2.6%)

$23,515 + $270,164

$293,679

2012

$4,368 (+1.4%)

$21,940 + $252,060

$274,000

2011

$4,309 (+3.4%)

$22,820 + $262,180

$285,000

2010

$4,167 (+1.2%)

$22,500 + $258,500

$281,000

2009

$4,116 (−25.3%)

$47,335 + $229,665

$277,000

2008

$5,510

$47,592 + $230,908

$278,500

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Public record

Public record
Zoning
Permits

Beds

Baths

Stories

Lot width

—

Lot depth

—

Lot size

6,500 Sq. Ft.

Year renovated

2003

Sq. Ft.

2,562

Year built

2003

Style

Single Family Residential

County

Contra Costa County

APN

0114210081

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Jul 13, 2026.

P-1

Planned Unit District

A large-scale integrated development or a general plan special area of concern provides an opportunity for, and requires cohesive design when flexible regulations are applied; whereas the application of conventional regulation, designed primarily for individual lot development, to a large-scale development or special area may create a monotonous and inappropriate neighborhood. The planned unit district is intended to allow diversification in the relationship of various uses, buildings, structures, lot sizes and open space while insuring substantial compliance with the general plan and the intent of the county code in requiring adequate standards necessary to satisfy the requirements of the public health, safety and general welfare. These standards shall be observed without unduly inhibiting the advantages of large-scale site or special area planning.

Permitted uses

Include but are not limited to:

Housing-Single unit

Jan 3, 2008 • Final

Building - residential plumbing

Install gas safety flow valves.

Gas

Feb 20, 2003 • Final

Building/residential/r/new single family-duplex

Construct a new single-family home based on plan number two.

New construction

Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.

Property details

Parking

Parking Information
Has Attached Garage
Garage Spaces: 2
Covered Spaces: 2
Parking Features: Attached, Garage Door Opener

Interior

Bathroom Information
# of Bathrooms Total: 3
# of Bathrooms Full: 3
Other Bathrooms Included Features: Shower Over Tub
Primary Bathroom Included Features: Stall Shower, Sunken Tub, Tile

Interior Features
Interior Features: Kitchen/Family Combo, Breakfast Bar, Breakfast Nook, Stone Counters
Appliances: Gas Range
Laundry Features: Laundry Room
Street Level Features: 4 Bedrooms, 3 Baths
Fireplaces Total: 1
Has Fireplace
Flooring: Laminate, Tile, Carpet

Room Information
Kitchen Features: Breakfast Bar,Breakfast Nook,Counter - Stone,Gas Range/Cooktop
Rooms Total: 9
Fireplace Features: Family Room

Exterior

Building Information
Construction Materials: Stucco
Building Area Total: 2,562
Builder Name: KIPER

Exterior Features
Fencing: Fenced

Property Information
Living Area: 2562
Living Area Units: Square Feet
Property Type: Residential
Property Sub Type: Single Family Residence
Year Built: 2003

Lot Information
Lot Size Square Feet: 6500
Lot Size Area: 0.15
Lot Size Units: Acres
Lot Size Acres: 0.15
Lot Features: Level
Zoning: P-1

Utilities

Utility Information
Sewer: Public Sewer

Heating & Cooling
Has Heating
Heating: Forced Air
Cooling: Central Air

Location

Homeowners Association Information
Pets Allowed: Number Limit
Has Association
Association Amenities: Greenbelt, Pool, Gated
Association Name: LAKESHORE HOA
Association Fee: $156
Association Fee Includes: Common Area Maint, Management Fee
Association Fee Frequency: Monthly

School Information
High School District: Byron (925) 634-6644

Public facts

Beds: 4
Baths: 3.0
Sq. Ft.: 2,562
Stories: 1.0
Lot Size: 6,500 square feet
Style: Single Family Residential
Year Built: 2003
Year Renovated: 2003
County: Contra Costa County
APN: 0114210081

Home facts updated by county records on Jul 13, 2026

Around this home

Schools

Timber Point Elementary School

Public K-5 • Assigned • 0.5mi

6/10

Excelsior Middle School

Public 6-8 • Assigned • 2.8mi

4/10

Liberty High School

Public 9-12 • Assigned • 4.5mi

7/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Climate risks

1/10 Flood Factor

Minimal risk of a flood reaching the building in the next 30 years

2/10 Fire Factor

0.00% chance of being in a wildfire in next 30 years

6/10 Heat Factor

7 days above 102° expected this year, 15 days in 30 years

1/10 Wind Factor

Minimal risk of severe winds over next 30 years

9/10 Air Factor

20 unhealthy days expected this year, 21 days in 30 years

Provided by First Street

Historical weather

Discovery Bay, CA • 94514

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

In this area, properties receive around 12.6 hours in June and 4.7 hours in December, placing it above the U.S. average for solar exposure.

12.6 hrs

4.7 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$642,000 – $777,000

Reach more buyers when you sell with Redfin. Save up to $6,753 in fees. 3 minutes to get started.

Need the cash from your home fast? Sell to .

Nearby similar homes

OPEN SAT, 1PM TO 4PM

$849,000

4 beds3 baths3,367 sq ft

453 Emerson Ct, Discovery Bay, CA 94505

NEW CONSTRUCTION

$499,000

4 beds2.5 baths3,111 sq ft

1133 Bradbury Dr, Discovery Bay, CA 94505

$735,000

4 beds3 baths1,867 sq ft

1732 Dolphin Pl, Discovery Bay, CA 94505

OPEN SAT, 12PM TO 3PM

$1,095,000

3 beds2 baths2,271 sq ft

1056 Discovery Bay Blvd, Discovery Bay, CA 94505

OPEN SEP 27, 2PM TO 4PM

$719,000

4 beds2.5 baths2,136 sq ft

2158 Newport Ct, Discovery Bay, CA 94505

$1,400,000

4 beds2.5 baths2,700 sq ft

5450 Beaver Ln, Discovery Bay, CA 94505

New listings for sale in 94505

OPEN SAT, 1PM TO 4PM

$835,000

3 beds2.5 baths2,330 sq ft

7364 Bay Harbor Way, Discovery Bay, CA 94505

OPEN SAT, 1PM TO 4PM

$849,000

4 beds3 baths3,367 sq ft

453 Emerson Ct, Discovery Bay, CA 94505

OPEN SAT, 1PM TO 4PM

$979,000

4 beds3 baths2,263 sq ft

9133 Calypso Ct, Discovery Bay, CA 94505

Coldwell Banker Realty, Coldwell Banker Realty

COMING SOON

$799,000

3 beds2 baths2,168 sq ft

4681 Spinnaker Way, Discovery Bay, CA 94505

$818,000

4 beds2.5 baths2,340 sq ft

7295 Keyesport Way, Discovery Bay, CA 94505

OPEN SAT, 12PM TO 3:30PM

$745,000

4 beds3 baths2,432 sq ft

3694 Otter Brook Loop, Discovery Bay, CA 94505

$1,250,000

4 beds3 baths2,636 sq ft

4880 Discovery Pt, Discovery Bay, CA 94505

OPEN SAT, 1PM TO 3PM

$685,000

4 beds2.5 baths1,706 sq ft

3524 Sailboat Dr, Discovery Bay, CA 94505

$689,000

4 beds3 baths2,562 sq ft

6171 Seneca Cir, Discovery Bay, CA 94505

Home values near 3447 Keystone Loop

Data from public records.

Address	Redfin Estimate
3423 Keystone Loop, Discovery Bay, CA 5 Beds \| 4 Baths \| 3517 Sq. Ft.	$815,482
3441 Keystone Loop, Discovery Bay, CA 4 Beds \| 2 Baths \| 2033 Sq. Ft.	$748,095

Address	Redfin Estimate
3429 Keystone Loop, Discovery Bay, CA 6 Beds \| 4 Baths \| 4285 Sq. Ft.	$923,012
3453 Keystone Loop, Discovery Bay, CA 3 Beds \| 3 Baths \| 3518 Sq. Ft.	$794,985

Address	Redfin Estimate
3435 Keystone Loop, Discovery Bay, CA 5 Beds \| 4 Baths \| 4011 Sq. Ft.	$853,496
3459 Keystone Loop, Discovery Bay, CA 4 Beds \| 2.5 Baths \| 3030 Sq. Ft.	$788,846

Property information provided by bridgeMLS, Bay East AOR, or Contra Costa AOR when last listed in 2010. This data may not match . Learn more.

Download the Redfin App on the Apple App Store

Download the Redfin App from the Google Play Store

Join us

Become an Agent

Get referrals

Careers

Find homes faster

About us

Find us

Subsidiaries

Affiliated Business

Countries

United States

Canada

Updated September 2025: By searching, you agree to the Terms of Use, and Privacy Policy.

Do not sell or share my personal information.

REDFIN and all REDFIN variants, WALK SCORE, and the R logos, are trademarks of Redfin Corporation, registered or pending in the USPTO.

California DRE #01521930

Redfin is licensed to do business in New York as Redfin Real Estate. NY Standard Operating Procedures

New Mexico Real Estate Licenses

TREC: Info About Brokerage Services, Consumer Protection Notice

All mortgage lending products and information are provided by Rocket Mortgage, LLC | NMLS #3030; www.NMLSConsumerAccess.org. Licensed in 50 states. This site is not authorized by the New York State Department of Financial Services for mortgage solicitation or loan applications activities related to properties located in the State of New York.

Redfin Corporation is an affiliated business of Rocket Limited Partnership. Each company, and their subsidiaries, are separate legal entities operated and managed through its own management and governance structures.

If you are using a screen reader, or having trouble reading this website, please call Redfin Customer Support for help at 1-844-759-7732.

REDFIN IS COMMITTED TO AND ABIDES BY THE FAIR HOUSING ACT AND EQUAL OPPORTUNITY ACT. READ REDFIN'S FAIR HOUSING POLICY AND THE NEW YORK STATE FAIR HOUSING NOTICE.

GreatSchools Ratings provided by GreatSchools.org.

94513 homes for sale
95219 homes for sale
94514 homes for sale
94505 homes for sale

Houses for rent in Discovery Bay	Agents near me	Irvine, CA homes for sale	Discovery Bay Housing Market
Houses for sale near me	San Diego, CA homes for sale	Fremont, CA homes for sale
Land for sale near me	San Francisco, CA homes for sale	Sacramento, CA homes for sale
Open Houses near me	Los Angeles, CA homes for sale	Discovery Bay Property Records
Condos for sale near me	San Jose, CA homes for sale	CA New Listings

Dublin homes for sale
Pleasanton homes for sale
San Ramon homes for sale

About this home

Redfin Estimate

Earn from this home

Market trends in 94505, CA

Sale history for 3447 Keystone Loop

Tax history for 3447 Keystone Loop

Public record

Property details

Around this home

Schools

Lifestyle

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 94505

Home values near 3447 Keystone Loop

More real estate resources