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3507 Keystone Loop, Discovery Bay, CA 94505 Property Records

Contra Costa County property record for 3507 Keystone Loop, Discovery Bay, CA 94505 · Last verified July 2026

Property Summary

Property TypeSingle Family Home
Details4 bd · 2.5 ba · 3,030 sqft · built 2003
Lot Size0.149 acres (6,500 sqft)
Owner2 Individual Names on File
Last Sale$725,000 (Oct 2025)
Tax Bill$6,314 (2025)
Deeds & MortgagesOct 2025 Sale & Mortgage
Flood ZoneZone X (moderate risk)
APN011-421-018

Property Details

APN / Parcel Number

Primary APN011-421-018
Alternative APN
  • 011-421-018-0

Interior

Bedrooms4 Beds
Full Baths2.5 Baths
Half Baths1 Half Bath
Total Rooms10 Rooms
Stories2 Stories
Building Area3,030 sqft Living Area
1st Floor Area1,952 sqft
2nd Floor Area1,078 sqft

Exterior

Year BuiltBuilt 2003
Effective Year BuiltEffective 2004
Architectural StyleCluster
Lot Area6,500 sqft (0.149 acres)
View / LotLake
Garage TypeAttached
Garage Area615 sqft
Parking Spaces2 Parking Spaces

Utilities, Heating & Cooling

Cooling SystemCentral

Location & Zoning

Street Address3507 KEYSTONE LOOP
CityDISCOVERY BAY
StateCA
Zip94505-2322
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionT8430 L18
Legal SubdivisionLAKESHORE 4
Legal Tract8430
Legal Lot Number18
JurisdictionCONTRA COSTA CA
Township / Civil DivisionEAST CONTRA COSTA
Census Block Group3
Census Block3001
Census Tract304007

Owner

Source: Contra Costa County records · APN 011-421-018

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 Record2 Individual Names on File
Mailing Address3507 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
OccupancyOwner Occupied
Owner TypeIndividual
VestingCommunity Property

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names2 Verified Names on Deed
Last SaleOct 24, 2025 · Amount on Record
Deed SaleOct 24, 2025 · Amount on Record
Prior SaleOct 20, 2011 · Amount on Record
Deed Document Number2025112412
Prior Transfer DateOct 16, 2002
Prior Transfer Doc0000401496
Record UpdatedSep 20, 2026

October 2025: Grant Deed, Transfer

Document TypeGrant Deed
JurisdictionCONTRA COSTA CA
Recording DateOct 24, 2025
Property Address3507 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
Document Number0000112412
Map ReferenceMB 436 PG 17
Instrument DateOct 21, 2025
Instrument2025- 112412
Transaction TypeTransfer
Record UpdatedApr 02, 2026
Title CompanyCHICAGO TITLE COMPANY

Transaction

AmountAmount Recorded
DownpaymentDownpayment on File
Loan-to-Value (LTV)LTV on Record
Tax$0.00
Amount AccuracyRounded by County
Additional
  • Arm's Length

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipRight of Survivorship
Address3507 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322

Mortgage

Document Number0000112413
DateOct 24, 2025
Instrument2025- 112413
Lender
NameUNITED WHOLESALE MORTGAGE
TypeMortgage Company
Agreement
TypeFHA Mortgage
AmountAmount Recorded
Term361 Months
DueNov 01, 2055

Tax Assessment & Valuation

Source: Contra Costa County records · Assessment roll updated July 14, 2026 · Last verified July 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 and assessed market value are set for property tax purposes, not market price estimates; both are a fraction of this property's market value.

YearTax BillAssessed Value
2026$725,000 (+92.41%) Land $150,000 Building $575,000
2025$6,314.00 (+7.47%)$376,807 (+4.04%) Land $37,676 Building $339,131
2023$5,875.00 (+1.68%)$362,177 Land $36,214 Building $325,963
2022$5,778.00

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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