OFF MARKET

Off Market Apr 2022 for $900K

$855,199

Est. refi paymentEst. refi $5,938/mo

•

4 ba

•

4,088

sq ft

3521 Keystone Loop, Discovery Bay, CA 94505

About this home

Stunning 5bd, 4bth over 4000sqft Lakeshore community home! Enjoy family gatherings in the large, open floorplan with formal dining room, family/kitchen combo and separate living room! Hardwood flooring welcomes you as you enter through the front doors and lead you throughout the downstairs area. Upgraded kitchen with stone flooring, granite countertops, recessed lighting, stainless steel appliances, center island and plenty of storage. Downstairs has 1 bedroom and bath, upstairs includes 4 bedrooms plus loft/theater/game room! Master bedroom with fireplace and retreat. Custom upgraded master closet with storage for all your favorites! Relax in jetted tub in your private, upgraded master bath. Enjoy evenings outside sitting around your firepit, entertaining at your backyard BBQ island or just enjoying the shade and quiet! This is the home you have been waiting for.....take a 3D tour at https://my.matterport.com/show/?m=hDsE3a6K5rt. Dont miss out on this great home!

Single-familyProperty Type

2003Year Built

6,500 sq ftLot Size

$209Est. Price/Sq.Ft.

3 car garageParking

Listed by Andy Lovick •DRE #01382837 • Adeta R.E., Funding & Invest.

Bought with Bradford Huang •DRE #01367344 • RE/MAX Gold Daly City

Source:bridgeMLS, Bay East AOR, or Contra Costa AOR #40909966

Redfin Estimate

$855,199

$45K since sold in April 2022$3,000 since August

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 12.2% higher than the average sale price ($762K) of 6 comparable homes.

SOLD JUL 20, 2026
$849,900
A
6 beds4 baths4,088 sq ft
3438 Keystone Loop, Discovery Bay, CA 94505
BOUGHT WITH REDFIN JUN 15, 2026
$740,000
B
4 beds3.5 baths3,097 sq ft
327 Mendocino Way, Discovery Bay, CA 94505
Iron Valley Real Estate NorCal, Iron Valley Real Estate NorCal
SOLD JUL 7, 2026
$740,000
C
5 beds3 baths3,092 sq ft
6372 Crystal Springs Cir, Discovery Bay, CA 94505
SOLD JUL 10, 2026
$675,000
D
5 beds3.5 baths3,333 sq ft
5141 Fern Ridge Cir, Discovery Bay, CA 94505
SOLD APR 30, 2026
$750,000
E
4 beds3 baths3,517 sq ft
716 Seminole Ct, Discovery Bay, CA 94505
SOLD BY REDFIN APR 14, 2026
$818,000
F
5 beds4 baths4,011 sq ft
3432 Keystone Loop, Discovery Bay, CA 94505

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Earn from this home

Sell

$149,900

Est. take-home

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Refinance

Est. cash available

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Rent

$4,119/mo

Redfin rental estimate

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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

$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
$699,999
2 beds2 baths1,370 sq ft
825 Discovery Bay Blvd, Discovery Bay, CA 94505
$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
$689,000
4 beds3 baths2,698 sq ft
2652 Crescent Way, Discovery Bay, CA 94505
LISTED BY REDFIN
$849,000
4 beds3 baths2,455 sq ft
1280 Saint Andrews Dr, Discovery Bay, CA 94505
COMING SOON
$574,900
3 beds2 baths1,484 sq ft
3733 Catamaran Ct, Discovery Bay, CA 94505
$850,000
5 beds4 baths3,917 sq ft
3159 Castle Rock Loop, Discovery Bay, CA 94505
See all

Provided by Redfin

Sale history for 3521 Keystone Loop

Date

Event

Price

Public Records

Apr 29, 2022

Sold

$900,000

$220/sq ft

San Francisco MLS #422640414

Apr 30, 2022

Delisted

—

Mar 26, 2022

Contingent

—

Mar 19, 2022

Listed

bridgeMLS, Bay East AOR, or Contra Costa AOR #40909966

Aug 6, 2020

Sold

$700,000

$171/sq ft

Jun 30, 2020

Pending

—

Jun 26, 2020

Listed

$644,950

$158/sq ft

+20

Public Records

Nov 22, 2019

Sold

$585,000

$143/sq ft

Public Records

Nov 12, 2010

Sold

$440,000

$108/sq ft

Year

Property tax

Land + Additions

Assessment*

2025

$11,404 (+3.0%)

$184,666 + $646,334

$831,000

2024

$11,070 (+0.3%)

$186,889 + $654,111

$841,000

2023

$11,037 (+13.8%)

$186,889 + $654,111

$841,000

2022

$9,695 (+2.4%)

$186,000 + $651,000

$837,000

2021

$9,466 (+9.0%)

$102,000 + $612,000

$714,000

2020

$8,687 (+33.8%)

$100,000 + $600,000

$700,000

2019

$6,491 (+4.1%)

$150,000 + $475,000

$625,000

2018

$6,238 (+2.2%)

$25,837 + $397,954

$423,791

2017

$6,104 (+5.9%)

$24,835 + $382,501

$407,336

2016

$5,766 (+2.8%)

$24,835 + $382,501

$407,336

2015

$5,608 (+1.9%)

$24,349 + $375,001

$399,350

2014

$5,503 (+0.8%)

$23,515 + $362,134

$385,649

2013

$5,458 (+9.4%)

$23,515 + $362,134

$385,649

2012

$4,987 (−5.5%)

$23,409 + $360,498

$383,907

2011

$5,276 (+2.4%)

$20,823 + $320,677

$341,500

2010

$5,150 (+1.2%)

$22,500 + $417,500

$440,000

2009

$5,089 (−23.9%)

$69,123 + $297,377

$366,500

2008

$6,687

$69,218 + $297,782

$367,000

Tax history for 3521 Keystone Loop

Year

Property tax

Land + Additions

Assessment*

2025

$11,404 (+3.0%)

$184,666 + $646,334

$831,000

2024

$11,070 (+0.3%)

$186,889 + $654,111

$841,000

2023

$11,037 (+13.8%)

$186,889 + $654,111

$841,000

2022

$9,695 (+2.4%)

$186,000 + $651,000

$837,000

2021

$9,466 (+9.0%)

$102,000 + $612,000

$714,000

2020

$8,687 (+33.8%)

$100,000 + $600,000

$700,000

2019

$6,491 (+4.1%)

$150,000 + $475,000

$625,000

2018

$6,238 (+2.2%)

$25,837 + $397,954

$423,791

2017

$6,104 (+5.9%)

$24,835 + $382,501

$407,336

2016

$5,766 (+2.8%)

$24,835 + $382,501

$407,336

2015

$5,608 (+1.9%)

$24,349 + $375,001

$399,350

2014

$5,503 (+0.8%)

$23,515 + $362,134

$385,649

2013

$5,458 (+9.4%)

$23,515 + $362,134

$385,649

2012

$4,987 (−5.5%)

$23,409 + $360,498

$383,907

2011

$5,276 (+2.4%)

$20,823 + $320,677

$341,500

2010

$5,150 (+1.2%)

$22,500 + $417,500

$440,000

2009

$5,089 (−23.9%)

$69,123 + $297,377

$366,500

2008

$6,687

$69,218 + $297,782

$367,000

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

Zoning and permits

Zoning
Permits

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

Property details

Interior

Room Information
# of Rooms: 11

Exterior

Property Information
Subdivision Name: SUBDIVISION 8430
Living Sq. Ft: 4,088
Ground Floor Sq. Ft: 1,991
Building Sq. Ft: 4,088
# of Stories: 2
Legal Description: T8430 POR LOT 20

Parking & Garage Information
Garage/Parking Sq. Ft: 715

Lot Information
# of Buildings: 1
Land Sq. Ft: 6,500
Legal Lot Number: 20
Acres: 0.1492
Zoning Code: P-1
County Use Description: SINGLE FAMILY DETACHED WITH MA

Financial

Assessor Information
Assessment Year: 2026

Public facts

Beds: 5
Baths: 4.0
Sq. Ft.: 4,088
Stories: 2.0
Lot Size: 6,500 square feet
Style: Single Family Residential
Year Built: 2003
Year Renovated: 2004
County: Contra Costa County
APN: 0114210206

Home facts updated by county records on Jul 13, 2026

Around this home

Schools

Timber Point Elementary School

Public K-5 • Assigned • 0.4mi

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 • 94505

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

$813,000 – $984,000

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Nearby similar homes

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NEW CONSTRUCTION

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VIDEO TOUR

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New listings for sale in 94505

$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

$699,999

2 beds2 baths1,370 sq ft

825 Discovery Bay Blvd, Discovery Bay, CA 94505

$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

$689,000

4 beds3 baths2,698 sq ft

2652 Crescent Way, Discovery Bay, CA 94505

LISTED BY REDFIN3D WALKTHROUGH

$849,000

4 beds3 baths2,455 sq ft

1280 Saint Andrews Dr, Discovery Bay, CA 94505

COMING SOON

$574,900

3 beds2 baths1,484 sq ft

3733 Catamaran Ct, Discovery Bay, CA 94505

Home values near 3521 Keystone Loop

Data from public records.

Address	Redfin Estimate
3501 Keystone Loop, Discovery Bay, CA 3 Beds \| 3 Baths \| 2562 Sq. Ft.	$744,873
3527 Keystone Loop, Discovery Bay, CA 5 Beds \| 4 Baths \| 4011 Sq. Ft.	$866,281

Address	Redfin Estimate
3507 Keystone Loop, Discovery Bay, CA 4 Beds \| 2.5 Baths \| 3030 Sq. Ft.	$801,284
3533 Keystone Loop, Discovery Bay, CA 5 Beds \| 3 Baths \| 2562 Sq. Ft.	$781,617

Address	Redfin Estimate
3515 Keystone Loop, Discovery Bay, CA 4 Beds \| 4 Baths \| 3518 Sq. Ft.	$823,463
3539 Keystone Loop, Discovery Bay, CA 4 Beds \| 2 Baths \| 2033 Sq. Ft.	$709,671

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GreatSchools Ratings provided by GreatSchools.org.

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About this home

Redfin Estimate

Earn from this home

Market trends in 94505, CA

Sale history for 3521 Keystone Loop

Tax history for 3521 Keystone Loop

Zoning and permits

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 3521 Keystone Loop

More real estate resources