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3531 Castle Rock Rd, Diamond Bar, CA 91765 Property Records

Los Angeles County property record for 3531 Castle Rock Rd, Diamond Bar, CA 91765

Property Summary

Property TypeSingle Family Home
Details3 bd · 2 ba · 1,448 sqft · built 1963
Lot Size0.172 acres (7,502 sqft)
Owner2 Individual Names on File
Last Sale$540,000 (Jul 2015)
Tax Bill$8,327 (2025)
Deeds & MortgagesFeb 2021 Mortgage
Jul 2020 Mortgage
Flood ZoneZone X (minimal risk)
APN8714-016-005

Property Details

APN / Parcel Number

Primary APN8714-016-005

Interior

Bedrooms3 Beds
Full Baths2 Baths
Building Area1,448 sqft Living Area

Exterior

Year BuiltBuilt 1963
Effective Year BuiltEffective 1963
Construction TypeWood
Lot Area7,502 sqft (0.172 acres)

Utilities, Heating & Cooling

Heating SystemCentral

Location & Zoning

Street Address3531 CASTLE ROCK RD
CityDIAMOND BAR
StateCA
Zip91765-3712
Property CategoryResidential
Property TypeResidential > Single Family > Home
Local Zoning CodeLCR17500*
Legal DescriptionTRACT NO 27577 LOT 54
Legal Subdivision27577
Legal Tract27577
Legal Block2
Legal Lot Number54
JurisdictionLOS ANGELES CA
Township / Civil DivisionEAST SAN GABRIEL VALLEY
Census Block Group2
Census Block2014
Census Tract403325

Owner

3531 Castle Rock Rd is owned and occupied by two individuals who bought it in July 2015.

Source: Los Angeles County records, as of August 25, 2026

Owner of Record2 Individual Names on File
Mailing Address3531 CASTLE ROCK RD, DIAMOND BAR, CA 91765-3712
OccupancyOwner Occupied
Owner TypeIndividual
VestingCommunity Property

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Deeds, Mortgages & Sale History

DateDocument
Feb 19, 2021Deed of Trust, Mortgage · Conventional Mortgage
ONY GLO INC
Jul 2, 2020Deed of Trust, Mortgage · Conventional Mortgage
CAPITALEND HM LOANS

Assessor's Deed Record

Deed Names2 Names on Deed
Last SaleJul 7, 2015 · Amount on File
Deed SaleJul 7, 2015 · Amount on File
Deed Document Number2015809400
Prior Transfer DateJan 28, 1994
Prior Transfer Doc0000259328
Record UpdatedOct 29, 2026

February 2021: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionLOS ANGELES CA
Property Address3531 CASTLE ROCK RD, DIAMOND BAR, CA 91765-3712
Transaction TypeMortgage
Record UpdatedMar 3, 2021
Title CompanyWESTERN RESOURCES TITLE, WESTERN RESOURCES TTL & SYNR

Transferred To (Grantee/Buyer)

NameVerified Name
Address3531 CASTLE ROCK RD, DIAMOND BAR, CA 91765-3712

Mortgage

Document Number0000283510
DateFeb 19, 2021
Instrument21-0283510
Lender
NameONY GLO INC
TypeMortgage Company
AddressSANTA ANA, CA 92707
Agreement
TypeConventional Mortgage
AmountAmount on Record
Term361 Months
DueMar 1, 2051

July 2020: Deed of Trust, Mortgage

Document TypeDeed of Trust
JurisdictionLOS ANGELES CA
Property Address3531 CASTLE ROCK RD, DIAMOND BAR, CA 91765-3712
Document Number0000756971
Instrument DateJul 2, 2020
Transaction TypeMortgage
Record UpdatedJul 17, 2020
Title CompanySTEWART TITLE, STEWART TITLE/CA

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipCommunity Property
Address3531 CASTLE ROCK RD DIAMOND BAR CA 917653712, DIAMOND BAR, CA 91765-3712

Mortgage

Document Number0000756971
DateJul 10, 2020
Instrument756971
Lender
NameCAPITALEND HM LOANS
AddressSANTA ANA, CA 92707
Agreement
TypeConventional Mortgage
AmountAmount on Record
Term360 Months
DueJul 9, 2050

Tax Assessment & Valuation

The 2025 property tax bill for 3531 Castle Rock Rd was $8,327 with a homeowner's exemption.

Source: Los Angeles County assessment roll, as of August 25, 2026

Property Jurisdictions

TypeName
StateCalifornia
CountyLos Angeles County
MunicipalityDiamond Bar City
Unified School DistrictWalnut Valley Unified School District (KG - 12)

Tax Bill & Assessment History

YearTax BillAssessed Value
2026$652,027 (+2%) Land $515,949 Building $136,078
2025$8,327.00 Homeowner's exemption$639,243 Land $505,833 Building $133,410
2023$7,588.00 (+2.15%) Homeowner's exemption$614,423 Land $486,192 Building $128,231
2022$7,428.00

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

Flood

FEMA maps place 3531 Castle Rock Rd in Zone X, an area of minimal flood risk.

Source: FEMA National Flood Hazard Layer, effective September 30, 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

Wildfire risk around 3531 Castle Rock Rd is moderate, ranking above 59% of the US, with a 0.1% annual chance of wildfire.

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

Wildfire RiskModerate
above 59% of the US · lower than 64% of California
Wildfire Likelihood0.1% annual chance
ExposureIndirect
within 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 SystemWALNUT VALLEY WATER DISTRICT
serves 100,941 people · EPA ID CA1910234
Water SourcePurchased surface water from several systems
Last State InspectionJun 2023
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 153 locations within half a mile, as of December 31, 2025

ProviderMax Down / Up (Mbps)
Frontier
Fiber		7,000 / 7,000
Spectrum
Cable		1,000 / 35
Verizon
Fixed Wireless		300 / 20
T-Mobile
Fixed Wireless		100 / 20
AT&T
Fixed Wireless		100 / 20

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