OFF MARKET

Off market may 2020 for $609K

$847,667

Est. refi paymentEst. refi $4,018/mo

•

4 ba

•

4,011

sq ft

3435 Keystone Loop, Discovery Bay, CA 94505

About this home

3435 Keystone Loop is a 4,011 square foot house on a 7,300 square foot lot with 5 bedrooms and 4 bathrooms. - it last sold on May 01, 2020 for $609,000. Based on Redfin's Discovery Bay data, we estimate the home's value is $847,667.

Single-familyProperty Type

2003Year Built

7,300 sq ftLot Size

$211Est. Price/Sq.Ft.

2 car garageParking

Source:Public Records

Redfin Estimate

$847,667

$239K since sold in May 2020$5,000 since October

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 1.4% higher than the average sale price ($836K) of 6 comparable homes.

SOLD BY REDFIN APR 14, 2026
$818,000
A
5 beds4 baths4,011 sq ft
3432 Keystone Loop, Discovery Bay, CA 94505
SOLD OCT 7, 2026
$765,000
B
5 beds4 baths3,953 sq ft
6217 Crystal Springs Cir, Discovery Bay, CA 94505
SOLD SEP 22, 2026
$945,000
C
6 beds4.5 baths4,679 sq ft
5671 Arcadia Cir, Discovery Bay, CA 94505
SOLD JUL 20, 2026
$849,900
D
6 beds4 baths4,088 sq ft
3438 Keystone Loop, Discovery Bay, CA 94505
SOLD OCT 30, 2026
$760,000
E
4 beds3.5 baths3,102 sq ft
6391 Crystal Springs Cir, Discovery Bay, CA 94505
SOLD APR 21, 2026
$879,000
F
5 beds3 baths3,139 sq ft
5647 Arcadia Cir, Discovery Bay, CA 94505

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Earn from this home

Sell

$378,758

Est. take-home

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Refinance

Est. cash available

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Rent

$4,148/mo

Redfin rental estimate

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Market trends in 94505, CA

Last updated October 2026

Buyer's Market

Seller's Market

Seller's market

Sale-to-list price

97.8%

+0.1% MoM

Median sale price

$745K

$20K MoM

Avg. days on market

46d

13 days MoM

Recently sold homes

2 MoM

New listings for sale

$949,000
3 beds2 baths1,773 sq ft
1814 Dune Point Way, Discovery Bay, CA 94505
$1,350,000
4 beds2.5 baths2,865 sq ft
2043 Windward Pt, Discovery Bay, CA 94505
$689,000
4 beds3 baths2,528 sq ft
3158 Castle Rock Loop, Discovery Bay, CA 94505
$1,399,988
3 beds3 baths2,823 sq ft
3973 Bolinas Pl, Discovery Bay, CA 94505
VIDEO TOUR
$1,045,000
3 beds3 baths1,524 sq ft
1466 Marlin Pl, Discovery Bay, CA 94505
$949,000
5 beds3 baths3,016 sq ft
5510 Lanai Ct, Discovery Bay, CA 94505
$629,000
3 beds2.5 baths1,706 sq ft
3729 Catamaran Ct, Discovery Bay, CA 94505
LISTED BY REDFIN
$775,000
4 beds3 baths2,695 sq ft
8586 Pinehollow Cir, Discovery Bay, CA 94505
$599,000
3 beds2 baths1,484 sq ft
3583 Sailboat Dr, Discovery Bay, CA 94505
See all

Provided by Redfin

Sale history for 3435 Keystone Loop

Year

Property tax

Land + Additions

Assessment*

2026

$9,784 (+3.1%)

$100,394 + $578,952

$679,346

2025

$9,486 (+5.0%)

$100,394 + $578,952

$679,346

2024

$9,036 (+1.6%)

$98,426 + $567,600

$666,026

2023

$8,897 (+1.7%)

$96,497 + $556,471

$652,968

2022

$8,752 (+2.4%)

$94,605 + $545,560

$640,165

2021

$8,547 (+0.2%)

$92,750 + $534,863

$627,613

2020

$8,527 (+1.2%)

$90,932 + $524,376

$615,308

2019

$8,424 (+6.8%)

$162,500 + $454,881

$617,381

2018

$7,889 (+4.2%)

$159,314 + $445,962

$605,276

2017

$7,572 (+6.7%)

$144,371 + $404,129

$548,500

2016

$7,094 (+14.3%)

$144,371 + $404,129

$548,500

2015

$6,206 (−8.4%)

$139,501 + $390,499

$530,000

2014

$6,776 (+26.5%)

$134,106 + $375,394

$509,500

2013

$5,355 (+0.1%)

$134,106 + $375,394

$509,500

2012

$5,348 (+12.2%)

$100,415 + $281,085

$381,500

2011

$4,765 (−4.9%)

$100,415 + $281,085

$381,500

2010

$5,013 (+1.3%)

$86,729 + $242,771

$329,500

2009

$4,947 (−24.8%)

$95,020 + $265,980

$361,000

2008

$6,579

$95,020 + $265,980

$361,000

Tax history for 3435 Keystone Loop

Year

Property tax

Land + Additions

Assessment*

2026

$9,784 (+3.1%)

$100,394 + $578,952

$679,346

2025

$9,486 (+5.0%)

$100,394 + $578,952

$679,346

2024

$9,036 (+1.6%)

$98,426 + $567,600

$666,026

2023

$8,897 (+1.7%)

$96,497 + $556,471

$652,968

2022

$8,752 (+2.4%)

$94,605 + $545,560

$640,165

2021

$8,547 (+0.2%)

$92,750 + $534,863

$627,613

2020

$8,527 (+1.2%)

$90,932 + $524,376

$615,308

2019

$8,424 (+6.8%)

$162,500 + $454,881

$617,381

2018

$7,889 (+4.2%)

$159,314 + $445,962

$605,276

2017

$7,572 (+6.7%)

$144,371 + $404,129

$548,500

2016

$7,094 (+14.3%)

$144,371 + $404,129

$548,500

2015

$6,206 (−8.4%)

$139,501 + $390,499

$530,000

2014

$6,776 (+26.5%)

$134,106 + $375,394

$509,500

2013

$5,355 (+0.1%)

$134,106 + $375,394

$509,500

2012

$5,348 (+12.2%)

$100,415 + $281,085

$381,500

2011

$4,765 (−4.9%)

$100,415 + $281,085

$381,500

2010

$5,013 (+1.3%)

$86,729 + $242,771

$329,500

2009

$4,947 (−24.8%)

$95,020 + $265,980

$361,000

2008

$6,579

$95,020 + $265,980

$361,000

*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

Aug 22, 2023 • Final

Building - residential mechanical

Upgrade the furnace, evaporator coil, thermal expansion valve, and air conditioning unit. A HERS report may be required at the final inspection.

HVAC

Jan 10, 2020 • Final

Building - residential mechanical

Replace the furnace in the attic of a residential building.

HVAC

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

Interior

Room Information
# of Rooms: 12

Exterior

Property Information
Subdivision Name: SUB 8430
Living Sq. Ft: 4,011
Ground Floor Sq. Ft: 1,984
Building Sq. Ft: 4,011
# of Stories: 2
Legal Description: T8430 POR LOT 6

Parking & Garage Information
Garage/Parking Sq. Ft: 438

Lot Information
# of Buildings: 1
Land Sq. Ft: 7,300
Legal Lot Number: 6
Acres: 0.1676
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.: 4,011
Stories: 2.0
Lot Size: 7,300 square feet
Style: Single Family Residential
Year Built: 2003
Year Renovated: 2003
County: Contra Costa County
APN: 0114210065

Home facts updated by county records on Oct 30, 2026

Around this home

Schools

K - 12
Preschool & daycare

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 • 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

$806,000 – $975,000

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Nearby similar homes

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Solar energy • Remote boat covers • 8,400 sq ft lot

NEW CONSTRUCTION

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Wood flooring • Plantation shutters • Spacious kitchen

New listings for sale in 94505

$949,000

3 beds2 baths1,773 sq ft

1814 Dune Point Way, Discovery Bay, CA 94505

Waterfront retreat • Low maintenance yard • New gutters

$1,350,000

4 beds2.5 baths2,865 sq ft

2043 Windward Pt, Discovery Bay, CA 94505

Waterfront deck • Private dock • Boat hoist

$689,000

4 beds3 baths2,528 sq ft

3158 Castle Rock Loop, Discovery Bay, CA 94505

Gated community • Two-way fireplace • Eat-in kitchen

$1,399,988

3 beds3 baths2,823 sq ft

3973 Bolinas Pl, Discovery Bay, CA 94505

Premium lot • Open floor plan • Custom fireplace

VIDEO TOUR

$1,045,000

3 beds3 baths1,524 sq ft

1466 Marlin Pl, Discovery Bay, CA 94505

Open-concept living • 2 garage spots • Built 1981

$949,000

5 beds3 baths3,016 sq ft

5510 Lanai Ct, Discovery Bay, CA 94505

Gated community • Lower level bedroom • Gourmet kitchen

$629,000

3 beds2.5 baths1,706 sq ft

3729 Catamaran Ct, Discovery Bay, CA 94505

Two story home • Dramatic entry • Expansive windows

LISTED BY REDFIN3D WALKTHROUGH

$775,000

4 beds3 baths2,695 sq ft

8586 Pinehollow Cir, Discovery Bay, CA 94505

Wood flooring • Plantation shutters • Spacious kitchen

$599,000

3 beds2 baths1,484 sq ft

3583 Sailboat Dr, Discovery Bay, CA 94505

Single-story home • Local parks • Shopping

Home values near 3435 Keystone Loop

Data from public records.

Address	Redfin Estimate
3411 Keystone Loop, Discovery Bay, CA 5 Beds \| 4 Baths \| 4011 Sq. Ft.	$771,582
3429 Keystone Loop, Discovery Bay, CA 6 Beds \| 4 Baths \| 4285 Sq. Ft.	$904,065
3453 Keystone Loop, Discovery Bay, CA 3 Beds \| 3 Baths \| 3518 Sq. Ft.	$781,029
3520 Keystone Loop, Discovery Bay, CA 4 Beds \| 3 Baths \| 3030 Sq. Ft.	$764,039
3444 Keystone Loop, Discovery Bay, CA 5 Beds \| 4 Baths \| 3517 Sq. Ft.	$803,270
3424 Keystone Loop, Discovery Bay, CA 4 Beds \| 4 Baths \| 3517 Sq. Ft.	$833,286
3317 Lookout Point Loop, Discovery Bay, CA 4 Beds \| 3 Baths \| 2110 Sq. Ft.	$732,950

Address	Redfin Estimate
3417 Keystone Loop, Discovery Bay, CA 4 Beds \| 3 Baths \| 2562 Sq. Ft.	$729,365
3441 Keystone Loop, Discovery Bay, CA 4 Beds \| 2 Baths \| 2033 Sq. Ft.	$742,163
3459 Keystone Loop, Discovery Bay, CA 4 Beds \| 2.5 Baths \| 3030 Sq. Ft.	$779,917
3516 Keystone Loop, Discovery Bay, CA 5 Beds \| 4 Baths \| 4011 Sq. Ft.	$742,763
3438 Keystone Loop, Discovery Bay, CA 6 Beds \| 4 Baths \| 4088 Sq. Ft.	$866,777
3416 Keystone Loop, Discovery Bay, CA 4 Beds \| 3 Baths \| 4088 Sq. Ft.	$726,268
3323 Lookout Point Loop, Discovery Bay, CA 4 Beds \| 2.5 Baths \| 2778 Sq. Ft.	$765,364

Address	Redfin Estimate
3423 Keystone Loop, Discovery Bay, CA 5 Beds \| 4 Baths \| 3517 Sq. Ft.	$812,081
3447 Keystone Loop, Discovery Bay, CA 4 Beds \| 3 Baths \| 2562 Sq. Ft.	$659,738
3526 Keystone Loop, Discovery Bay, CA 5 Beds \| 4 Baths \| 4088 Sq. Ft.	$811,050
3450 Keystone Loop, Discovery Bay, CA 5 Beds \| 2.5 Baths \| 3030 Sq. Ft.	$814,925
3432 Keystone Loop, Discovery Bay, CA 5 Beds \| 4 Baths \| 4011 Sq. Ft.	$857,977
3311 Lookout Point Loop, Discovery Bay, CA 4 Beds \| 3 Baths \| 2778 Sq. Ft.	$744,300
3329 Lookout Point Loop, Discovery Bay, CA 4 Beds \| 3 Baths \| 3362 Sq. Ft.	$794,461

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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 3435 Keystone Loop

Tax history for 3435 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 3435 Keystone Loop

More real estate resources