3515 Keystone Loop, Discovery Bay, CA 94505 Property Records

Contra Costa County property record for 3515 Keystone Loop, Discovery Bay, CA 94505 · Last verified July 2026

Property Summary

Property Type	Single Family Home
Details	4 bd · 4 ba · 3,518 sqft · built 2003
Lot Size	0.149 acres (6,500 sqft)
Owner	Individual Name on File
Last Sale	$799,000 (Sep 2023)
Tax Bill	$11,118 (2025)
Deeds & Mortgages	Sep 2023 Sale & Mortgage Mar 2022 Mortgage + 1 more
Flood Zone	Zone X (moderate risk)
APN	`011-421-019-8`

Property Details

APN / Parcel Number

Primary APN	`011-421-019-8`
Alternative APN	`011-421-019`

Interior

Bedrooms	4 Beds
Full Baths	4 Baths
Total Rooms	11 Rooms
Stories	2 Stories
Building Area	3,518 sqft Living Area
1st Floor Area	1,719 sqft
2nd Floor Area	1,799 sqft

Exterior

Year Built	Built 2003
Effective Year Built	Effective 2004
Architectural Style	Cluster
Lot Area	6,500 sqft (0.149 acres)
View / Lot	Lake
Garage Type	Attached
Garage Area	596 sqft
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central

Location & Zoning

Street Address	3515 KEYSTONE LOOP
City	DISCOVERY BAY
State	CA
Zip	94505-2322
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	T8430 L19
Legal Subdivision	SUBDIVISION 8430
Legal Tract	8430
Legal Lot Number	19
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	EAST CONTRA COSTA
Census Block Group	3
Census Block	3001
Census Tract	304007

Owner

Source: Contra Costa County records · APN 011-421-019-8

Assessment roll updated July 14, 2026 · Last verified July 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record	Individual Name on File
Mailing Address	3515 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Date	Document
Sep 29, 2023	Grant Deed, Transfer · Conventional Mortgage PREMIERONE CU
Mar 01, 2022	Deed of Trust, Mortgage · Conventional Mortgage GENHOME MORTGAGE CORP
Jan 25, 2021	Grant Deed, Transfer · Conventional with PMI BECKAM FNDG CORP

Assessor's Deed Record

Deed Names	Verified Name on Deed
Last Sale	Sep 29, 2023 · Amount on Record
Deed Sale	Sep 29, 2023 · Amount on Record
Prior Sale	Jan 25, 2021 · Amount on Record
Deed Document Number	202394362
Prior Transfer Date	Oct 16, 2002
Prior Transfer Doc	0000401496
Record Updated	Sep 20, 2026

September 2023: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Sep 29, 2023
Property Address	3515 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
Document Number	0000094362
Map Reference	MB 436 PG 17
Instrument Date	Aug 29, 2023
Instrument	2023-094362
Transaction Type	Transfer
Record Updated	Oct 10, 2023
Title Company	STEWART TITLE, STEWART TITLE OF CA INC

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on File
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	39430 CIVIC CENTER DR APT 309, 309, FREMONT, CA 94538-6709

Mortgage

Document Number	0000094363
Date	Sep 29, 2023
Instrument	2023-094363

Lender

Name	PREMIERONE CU
Type	Credit Union

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Oct 01, 2053

March 2022: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	3515 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
Transaction Type	Mortgage
Record Updated	Nov 03, 2022
Title Company	OLD REPUBLIC TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	3515 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322

Mortgage

Document Number	0000036514
Date	Mar 01, 2022
Instrument	2022-036514

Lender

Name	GENHOME MORTGAGE CORP
Type	Mortgage Company
Address	IRVINE, CA 92614

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	Mar 01, 2052

January 2021: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	CONTRA COSTA CA
Recording Date	Jan 25, 2021
Property Address	3515 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
Document Number	0000023209
Instrument Date	Jan 19, 2021
Instrument	23209
Transaction Type	Transfer
Record Updated	Feb 03, 2021
Title Company	CHICAGO TITLE COMPANY, CHICAGO TITLE CO

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on File
Loan-to-Value (LTV)	LTV on Record
Tax	$820.00
Amount Accuracy	Full Value
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	3515 KEYSTONE LOOP DISCOVERY BAY CA 945052322, DISCOVERY BAY, CA 94505-2322

Mortgage

Document Number	23210
Date	Jan 25, 2021
Instrument	23210

Lender

Name	BECKAM FNDG CORP
Address	SANTA ANA, CA 92705

Agreement

Type	Conventional with PMI
Amount	Amount Recorded
Term	360 Months
Due	Jan 24, 2051

Tax Assessment & Valuation

Source: Contra Costa County records · Assessment roll updated July 14, 2026 · Last verified July 2026

Property Jurisdictions

Type	Name
State	California
County	Contra Costa County
Elementary School District	Byron Union Elementary School District (KG - 08)
Secondary School District	Liberty Union High School District (09 - 12)

Tax Bill & Assessment History

Assessed value is set for property tax purposes and is not a market price estimate.

Year	Tax Bill	Assessed Value
2026		$831,279 (+2%) Land $208,080 Building $623,199
2025	$11,118.00 (+7.28%)	$814,980 (+5.15%) Land $204,000 Building $610,980
2023	$10,364.00 (+1.66%)	$775,098 Land $156,060 Building $619,038
2022	$10,195.00

Flood & Wildfire

Source: FEMA National Flood Hazard Layer, Contra Costa County (06013C), updated October 12, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060133040073, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026

Flood

FEMA Flood Zone	Zone X
Special Flood Hazard Area	No
Flood Hazard	Moderate
500-Year Floodplain	Yes
Nearest Special Flood Hazard Area	Zone AE, within 500 ft
Community Rating System	Class 6 (20% premium discount)
Nearby Flood Policies	2 in force

Wildfire

Wildfire Risk	Not rated no burnable land in reach
Wildfire Likelihood	Negligible
Exposure	None beyond ember reach

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Internet Providers

Source: FCC Broadband Data Collection, availability as of December 31, 2025 · Published October 2026 · based on 226 locations within about half a mile of this property

Provider	Technology	Download / Upload (Mbps)
Xfinity	Cable	2,000 / 250
Unwired	Fixed Wireless	300 / 25
Verizon	Fixed Wireless	300 / 20

May also be available at this address: AT&T, T-Mobile USA. Availability varies by address; speeds are provider-advertised maximums, not measured.

Mobile Coverage

5G and 4G LTE

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