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4023 Boulder Dr, Antioch, CA 94509 Property Records

Contra Costa County property record for 4023 Boulder Dr, Antioch, CA 94509

Property Summary

Property TypeSingle Family Home
Details4 bd · 2.5 ba · 2,175 sqft · built 1978
Lot Size0.331 acres (14,400 sqft)
Owner2 Individual Names on Record
Last Sale$245,000 (Jan 2012)
Tax Bill$4,015 (2025)
Deeds & MortgagesFeb 2019 Mortgage
Oct 2018 Mortgage
+ 1 more
Flood ZoneZone X (minimal risk)
APN072-103-005-4

Property Details

APN / Parcel Number

Primary APN072-103-005-4
Alternative APN
  • 072-103-005

Interior

Bedrooms4 Beds
Full Baths2.5 Baths
Half Baths1 Half Bath
Total Rooms10 Rooms
Stories2 Stories
Building Area2,175 sqft Living Area
1st Floor Area1,186 sqft
2nd Floor Area989 sqft

Exterior

Year BuiltBuilt 1978
Effective Year BuiltEffective 1978
Lot Area14,400 sqft (0.331 acres)
Garage TypeAttached
Garage Area653 sqft
Parking Spaces2 Parking Spaces

Utilities, Heating & Cooling

Heating SystemCentral

Location & Zoning

Street Address4023 BOULDER DR
CityANTIOCH
StateCA
Zip94509-6234
Property CategoryResidential
Property TypeResidential > Single Family > Home
Local Zoning CodeR1
Legal DescriptionT04693 L0178 B EX 1/4 MR
Legal SubdivisionSUBDIVISION 4693
Legal Tract04693
Legal Lot Number178
JurisdictionCONTRA COSTA CA
Township / Civil DivisionANTIOCH-PITTSBURG
Census Block Group1
Census Block1011
Census Tract355109

Owner

Source: Contra Costa County records, as of July 14, 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 Record
Mailing Address908 BLUEROCK DR, ANTIOCH, CA 94509-6936
Owner TypeIndividual
VestingJoint Tenants

Deeds, Mortgages & Sale History

DateDocument
Feb 20, 2019Deed of Trust, Mortgage · FHA Mortgage
GUILD MORTGAGE CO
Oct 10, 2018Deed of Trust, Mortgage · FHA Mortgage
GUILD MORTGAGE CO
Mar 12, 2021Deed of Trust, Mortgage · Conventional Mortgage
GUILD MORTGAGE CO

Assessor's Deed Record

Deed Names2 Names on Deed
Last SaleJan 27, 2012 · Amount on Record
Deed SaleJan 27, 2012 · Amount on Record
Prior SaleNov 8, 2011 · Amount on Record
Deed Document Number201219623
Prior Transfer DateDec 22, 1998
Prior Transfer Doc0000325911
Record UpdatedSep 20, 2026

February 2019: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionCONTRA COSTA CA
Property Address4023 BOULDER DR, ANTIOCH, CA 94509-6234
Transaction TypeMortgage
Record UpdatedNov 3, 2022
Title CompanyOLD REPUBLIC TITLE

Transferred To (Grantee/Buyer)

NameVerified Name

Mortgage

Document Number0000022269
DateFeb 20, 2019
Instrument2019-022269
Lender
NameGUILD MORTGAGE CO
TypeMortgage Company
AddressSAN DIEGO, CA 92111
Agreement
TypeFHA Mortgage
AmountAmount Recorded
Term361 Months
DueMar 1, 2049

October 2018: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionCONTRA COSTA CA
Property Address4023 BOULDER DR, ANTIOCH, CA 94509-6234
Transaction TypeMortgage
Record UpdatedNov 3, 2022
Title CompanyOLD REPUBLIC TITLE COMPANY

Transferred To (Grantee/Buyer)

NameVerified Name

Mortgage

Document Number0000161063
DateOct 10, 2018
Instrument2018-161063
Lender
NameGUILD MORTGAGE CO
TypeMortgage Company
AddressSAN DIEGO, CA 92111
Agreement
TypeFHA Mortgage
AmountAmount Recorded
Term361 Months
DueNov 1, 2048

March 2021: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionCONTRA COSTA CA
Property Address4023 BOULDER DR, ANTIOCH, CA 94509-6234
Transaction TypeMortgage
Record UpdatedNov 3, 2022
Title CompanyOLD REPUBLIC TITLE CO

Transferred To (Grantee/Buyer)

NameVerified Name
Address4023 BOULDER DR, ANTIOCH, CA 94509-6234

Mortgage

Document Number0000076491
DateMar 12, 2021
Instrument2021-076491
Lender
NameGUILD MORTGAGE CO
TypeMortgage Company
AddressSAN DIEGO, CA 92111
Agreement
TypeConventional Mortgage
AmountAmount Recorded
Term361 Months
DueApr 1, 2051

Tax Assessment & Valuation

Source: Contra Costa County assessment roll, as of July 14, 2026

Property Jurisdictions

TypeName
StateCalifornia
CountyContra Costa County
MunicipalityAntioch City
Unified School DistrictAntioch Unified School District (KG - 12)

Tax Bill & Assessment History

YearTax BillAssessed Value
2026$313,873 (+2%) Land $51,239 Building $262,634
2025$4,015.00 (+5.46%)$307,720 (+4.04%) Land $50,235 Building $257,485
2023$3,807.00 (+1.52%)$295,773 Land $48,285 Building $247,488
2022$3,750.00

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

Flood

Source: FEMA National Flood Hazard Layer, effective October 12, 2026

FEMA Flood ZoneZone X
minimal risk
Flood Insurance RequirementNot required
lenders may require it

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

Wildfire

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire RiskLow
lower than 80% of the US · lower than 88% of California
Wildfire Likelihood0.01% annual chance
ExposureNone
beyond ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water SystemCITY OF ANTIOCH
serves 116,781 people · EPA ID CA0710001
Water SourceSurface water
Last State InspectionJan 2024
LeadUnder 1 ppb (2022–2024)
action level 15 ppb

Violations Reported to EPA

Water QualityNone
last 10 years
Treatment and ProcedureNone
last 10 years
Monitoring and ReportingNone
last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 645 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Xfinity
Cable		2,000 / 250
Unwired
Fixed Wireless		300 / 25
AT&T
DSL		100 / 20

May also be available: Verizon.

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