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3508 Keystone Loop, Discovery Bay, CA 94505 Property Records

Contra Costa County property record for 3508 Keystone Loop, Discovery Bay, CA 94505 · Last verified August 2026

Property Summary

Property TypeSingle Family Home
Details3 bd · 3 ba · 2,562 sqft · built 2003
Lot Size0.156 acres (6,800 sqft)
OwnerCompany Name on File
Last Sale$463,500 (Mar 2004)
Tax Bill$9,329 (2025)
Deeds & MortgagesApr 2023 Transfer
Flood ZoneZone X (moderate risk)
APN011-421-034-7

Property Details

APN / Parcel Number

Primary APN011-421-034-7
Alternative APN
  • 011-421-034

Interior

Bedrooms3 Beds
Full Baths3 Baths
Total Rooms9 Rooms
Stories1 Story
Building Area2,562 sqft Living Area
1st Floor Area2,562 sqft

Exterior

Year BuiltBuilt 2003
Effective Year BuiltEffective 2004
Architectural StyleCluster
Lot Area6,800 sqft (0.156 acres)
View / LotLake
Garage TypeAttached
Garage Area495 sqft
Parking Spaces2 Parking Spaces

Utilities, Heating & Cooling

Cooling SystemCentral

Location & Zoning

Street Address3508 KEYSTONE LOOP
CityDISCOVERY BAY
StateCA
Zip94505-2321
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionT8430 L34
Legal SubdivisionSUBDIVISION 8430
Legal Tract8430
Legal Lot Number34
JurisdictionCONTRA COSTA CA
Township / Civil DivisionEAST CONTRA COSTA
Census Block Group3
Census Block3003
Census Tract304007

Owner

Source: Contra Costa County records · APN 011-421-034-7

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

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

Owner of RecordCompany Name on File
Mailing Address3508 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2321
OccupancyOwner Occupied
Owner TypeCompany
VestingTrust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed NamesVerified Name on Deed
Last SaleMar 22, 2004 · Amount on Record
Deed SaleMar 22, 2004 · Amount on Record
Deed Document Number200494234
Last Transfer DateMar 06, 2023
Transfer Doc0000030442
Record UpdatedSep 20, 2026

April 2023: Intrafamily Transfer, Transfer

Document TypeIntrafamily Transfer
JurisdictionCONTRA COSTA CA
Recording DateApr 03, 2023
Property Address3508 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2321
Document Number0000030442
Map ReferenceMB 436 PG 17
Instrument DateMar 06, 2023
Instrument2023-030442
Transaction TypeTransfer
Record UpdatedJun 07, 2023

Transaction

Tax$0.00
Amount AccuracyTransfer Tax Exempt
Additional
  • Intrafamily Transfer

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipRevocable Living Trust
Address3508 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2321

Tax Assessment & Valuation

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

Property Jurisdictions

TypeName
StateCalifornia
CountyContra Costa County
Elementary School DistrictByron Union Elementary School District (KG - 08)
Secondary School DistrictLiberty 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.

YearTax BillAssessed Value
2026$672,002 (+2%) Land $159,515 Building $512,487
2025$9,329.00 (+6.67%) Homeowner's exemption$658,827 (+4.04%) Land $156,388 Building $502,439
2023$8,746.00 (+1.69%) Homeowner's exemption$633,246 Land $150,316 Building $482,930
2022$8,601.00

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 ZoneZone X
Special Flood Hazard AreaNo
Flood HazardModerate
500-Year FloodplainYes
Nearest Special Flood Hazard AreaZone AE, within 500 ft
Community Rating SystemClass 6 (20% premium discount)
Nearby Flood Policies2 in force

Wildfire

Wildfire RiskNot rated
no burnable land in reach
Wildfire LikelihoodNegligible
ExposureNone
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

ProviderTechnologyDownload / Upload (Mbps)
XfinityCable2,000 / 250
UnwiredFixed Wireless300 / 25
VerizonFixed Wireless300 / 20

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

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