478 S Rock River Rd, Diamond Bar, CA 91765 Property Records

Los Angeles County property record for 478 S Rock River Rd, Diamond Bar, CA 91765

Property Summary

Property Type	Single Family Home
Details	4 bd · 2 ba · 1,476 sqft · built 1971
Lot Size	0.206 acres (8,974 sqft)
Owner	2 Company Names on Record
Tax Bill	$4,794 (2025)
Deeds & Mortgages	Aug 2023 Transfer
Flood Zone	Zone X (minimal risk)
APN	`8718-027-014`

Property Details

APN / Parcel Number

Primary APN	`8718-027-014`

Interior

Bedrooms	4 Beds
Full Baths	2 Baths
Total Rooms	10 Rooms
Stories	1 Story
Building Area	1,476 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1971
Effective Year Built	Effective 1971
Architectural Style	Conventional
Exterior Material	Stucco
Construction Type	Wood
Roof Type	Gable
Roof Material	Wood Shingle
Lot Area	8,974 sqft (0.206 acres)
Lot Dimensions	152 ft deep x 60 ft wide

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	478 S ROCK RIVER RD
City	DIAMOND BAR
State	CA
Zip	91765-1561
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	LCR18000*
Legal Description	TRACT NO 28058 LOT 29
Legal Subdivision	28058
Legal Tract	28058
Legal Block	1
Legal Lot Number	29
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	1
Census Block	1018
Census Tract	403327

Owner

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

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

Owner of Record	2 Company Names on Record
Mailing Address	20115 LAKE CANYON DR, WALNUT, CA 91789-3546
Owner Type	Company
Vesting	Life Tenant

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Transfer Date	Aug 15, 2023
Transfer Doc	0000558638
Record Updated	Oct 29, 2026

August 2023: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	LOS ANGELES CA
Recording Date	Aug 22, 2023
Property Address	478 S ROCK RIVER RD, DIAMOND BAR, CA 91765-1561
Document Number	0000558638
Map Reference	MB 796 PG 4-6
Instrument Date	Aug 15, 2023
Instrument	23-0558638
Transaction Type	Transfer
Record Updated	Sep 5, 2023

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Living Trust
Address	20115 LAKE CANYON DR, WALNUT, CA 91789-3546

Tax Assessment & Valuation

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

Property Jurisdictions

Type	Name
State	California
County	Los Angeles County
Municipality	Diamond Bar City
Unified School District	Pomona Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$317,132 (+2%) Land $125,740 Building $191,392
2025	$4,794.00 (+13.39%)	$310,915 (+4.04%) Land $123,275 Building $187,640
2023	$4,228.00 (+2.85%)	$298,843 Land $118,489 Building $180,354
2022	$4,111.00

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

Flood

Source: FEMA National Flood Hazard Layer, effective September 30, 2026

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not 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 Risk	Low lower than 65% of the US · lower than 79% of California
Wildfire Likelihood	0.05% annual chance
Exposure	None 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 System	WALNUT VALLEY WATER DISTRICT serves 100,941 people · EPA ID CA1910234
Water Source	Purchased surface water from several systems
Last State Inspection	Jun 2023
Lead	Under 1 ppb (2022–2024) action level 15 ppb

Violations Reported to EPA

Water Quality	None last 10 years
Treatment and Procedure	None last 10 years
Monitoring and Reporting	None 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 69 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Spectrum Cable	1,000 / 35
Starlink Satellite	280 / 30
T-Mobile Fixed Wireless	100 / 20

May also be available: AT&T, Verizon.

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