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3521 Keystone Loop, Discovery Bay, CA 94505 Property Records

Contra Costa County property record for 3521 Keystone Loop, Discovery Bay, CA 94505 · Last verified July 2026

Property Highlights

Property TypeResidential > Single Family > Home
Bedrooms5 Beds
Bathrooms4 Baths
Year BuiltBuilt 2004
Square Footage4,088 sqft Living Area
Lot Size6,500 sqft (0.149 acres)
OccupancyOwner Occupied
Last Sale$900,000 (2022)
Tax Bill$11,404.00 (2025)

Property Details

APN / Parcel Number

Primary APN011-421-020-6
Alternative APN
  • 011-421-020

Interior

Bedrooms5 Beds
Full Baths4 Baths
Total Rooms11 Rooms
Building Area4,088 sqft Living Area
1st Floor1,991 sqft 1st Floor
2nd Floor2,097 sqft 2nd Floor
Stories2 Stories

Exterior

Year BuiltBuilt 2003
Effective Year BuiltEffective 2004
Architectural StyleCluster Style
Lot Area6,500 sqft (0.149 acres)
Parking Spaces2 Parking Spaces
Garage TypeAttached Garage
Garage Area715 sqft Garage

Utilities and HVAC

Cooling SystemCentral Cooling

Location & Zoning

Street Address3521 KEYSTONE LOOP
CityDISCOVERY BAY
StateCA
Zip94505-2322
Property UsageResidential Property Usage
TypeResidential > Single Family > Home
Legal DescriptionT8430 POR LOT 20
Legal SubdivisionSUBDIVISION 8430
Legal Tract8430
Legal Lot Number20
JurisdictionCONTRA COSTA CA
Minor Civil DivisionEAST CONTRA COSTA
Census Blockgroup3
Census Block3001
Census Tract304007

Owner

Source: Contra Costa County records · APN 011-421-020-6

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 RecordIndividual Name on File
Mailing Address3521 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
OccupancyOwner Occupied
Owner TypeOwner is an Individual, Couple or Unincorporated Entity

Deeds, Mortgages & Sale History

DateDocument
May 29, 2026Transfer on Death Deed, Transfer
NONE LISTED ON DOCUMENT
May 29, 2026Transfer on Death Deed, Transfer
NONE LISTED ON DOCUMENT
Apr 29, 2022Grant Deed, Transfer · Conventional Mortgage
MUFG UNION BANK NA
Aug 06, 2020Grant Deed, Transfer · Conventional Mortgage
DIVINE MTG CAP
Nov 22, 2019Grant Deed, Transfer · Conventional Mortgage
MUFG UNION BANK NA
May 21, 2018Affidavit of Death, Transfer

Assessor's Deed Record

Deed NamesVerified Name on Deed
Last SaleApr 29, 2022 · Amount on Record
Deed SaleApr 29, 2022 · Amount on Record
Prior SaleAug 06, 2020 · Amount on Record
Deed Doc Number202274338
Prior Transfer DateMay 01, 2013
Prior Transfer Doc0000190733
Record RefreshedSep 20, 2026

May 2026: Transfer on Death Deed, Transfer

Document TypeTransfer on Death Deed
JurisdictionCONTRA COSTA CA
Recording DateMay 29, 2026
Property Address3521 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
Document Number0000056642
Instrument DateMay 28, 2026
Instrument202656642
Transaction TypeTransfer
Record UpdatedJul 12, 2026
Title CompanyNONE LISTED ON DOCUMENT

Transaction

Tax$0.00
Amount AccuracyFull Amount Stated

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
Address3521 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322

May 2026: Transfer on Death Deed, Transfer

Document TypeTransfer on Death Deed
JurisdictionCONTRA COSTA CA
Recording DateMay 29, 2026
Property Address3521 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
Document Number0000056643
Instrument DateMay 28, 2026
Instrument202656643
Transaction TypeTransfer
Record UpdatedJul 12, 2026
Title CompanyNONE LISTED ON DOCUMENT

Transaction

Tax$0.00
Amount AccuracyFull Amount Stated

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
Address3521 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322

April 2022: Grant Deed, Transfer

Document TypeGrant Deed
JurisdictionCONTRA COSTA CA
Recording DateApr 29, 2022
Property Address3521 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
Document Number0000074338
Map ReferenceMB 436 PG 17
Instrument DateApr 20, 2022
Instrument2022-074338
Transaction TypeTransfer
Record UpdatedNov 03, 2022
Title CompanyOLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY

Transaction

AmountAmount Recorded
DownpaymentDownpayment on File
Loan-to-Value (LTV)LTV on Record
Tax$0.00
Amount AccuracyRounded Values by County
Additional
  • Arms Length Transaction

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipCommunity Property (Marital Community) with Rights of Survivorship
Address3521 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322

Mortgage

Document Number0000074339
DateApr 29, 2022
Instrument2022-074339
Lender
NameMUFG UNION BANK NA
TypeBank
Agreement
TypeConventional Mortgage
AmountAmount Recorded
Term361 Months
DueMay 01, 2052

August 2020: Grant Deed, Transfer

Document TypeGrant Deed
JurisdictionCONTRA COSTA CA
Recording DateAug 06, 2020
Property Address3521 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
Document Number0000163993
Instrument DateJul 29, 2020
Instrument163993
Transaction TypeTransfer
Record UpdatedAug 24, 2020
Title CompanyFIRST AMERICAN TITLE

Transaction

AmountAmount Recorded
DownpaymentDownpayment on File
Loan-to-Value (LTV)LTV on Record
Tax$770.00
Amount AccuracyFull Value
Additional
  • Arms Length Transaction

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
Address3521 KEYSTONE LOOP DISCOVERY BAY CA 945052322, DISCOVERY BAY, CA 94505-2322

Mortgage

Document Number163994
DateAug 06, 2020
Instrument163994
Lender
NameDIVINE MTG CAP
AddressCITY OF INDUSTRY, CA 91748
Agreement
TypeConventional Mortgage
AmountAmount Recorded
Term360 Months
DueAug 05, 2050

November 2019: Grant Deed, Transfer

Document TypeGrant Deed
JurisdictionCONTRA COSTA CA
Recording DateNov 22, 2019
Property Address3521 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
Document Number0000210098
Map ReferenceMB 436 PG 17
Instrument DateNov 06, 2019
Instrument2019-210098
Transaction TypeTransfer
Record UpdatedNov 03, 2022
Title CompanyCHICAGO TITLE COMPANY

Transaction

AmountAmount Recorded
DownpaymentDownpayment on File
Loan-to-Value (LTV)LTV on Record
Tax$0.00
Amount AccuracyRounded Values by County
Additional
  • Arms Length Transaction

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipCommunity Property (Marital Community) with Rights of Survivorship
Address3521 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322

Mortgage

Document Number0000210099
DateNov 22, 2019
Instrument2019-210099
Lender
NameMUFG UNION BANK NA
TypeBank
Agreement
TypeConventional Mortgage
AmountAmount Recorded
Term361 Months
DueDec 01, 2049
Interest
Rate TypeAdjustable Rate
Rate3.25%
Type Change DateDec 01, 2024
Change FrequencyAnnually
Min Rate At Change2.25%
Max Rate At Change5.25%
Index1-Year LIBOR
Max Rate9.25%

May 2018: Affidavit of Death, Transfer

Document TypeAffidavit of Death
JurisdictionCONTRA COSTA CA
Recording DateMay 21, 2018
Property Address3521 KEYSTONE LOOP, DISCOVERY BAY, CA 94505-2322
Document Number0000079374
Instrument DateJan 12, 2018
Instrument79374
Transaction TypeTransfer
Record UpdatedJun 04, 2018

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipPersonal Trust
Address3739 AURORA LOOP ROCKLIN CA 956774768, ROCKLIN, CA 95677-4768

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

YearTax BillAssessed Value
2026$831,000 (-1.19%) Land $184,666 Building $646,334
2025$11,404.00 (+3.33%)$841,000 (+0.48%) Land $186,889 Building $654,111
2023$11,036.00 (+13.84%)$837,000 Land $186,000 Building $651,000
2022$9,694.00

Flood & Wildfire

Source: FEMA National Flood Hazard Layer, Contra Costa County (06013C), updated October 12, 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026

Flood

FEMA Flood ZoneZone X
Flood HazardModerate
500-Year FloodplainYes
Special Flood Hazard AreaNo
Nearest Special Flood Hazard AreaZone AE, within 500 ft

Wildfire

Wildfire RiskNot rated
no burnable land in reach
Wildfire LikelihoodNegligible
ExposureNone
beyond ember reach

Values are read at the parcel center point; lenders make the official flood determination.

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