21080 Running Branch Rd, Diamond Bar, CA 91765 Property Records

Los Angeles County property record for 21080 Running Branch Rd, Diamond Bar, CA 91765

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 3,032 sqft · built 1982
Lot Size	0.291 acres (12,690 sqft)
Owner	2 Company Names on File
Last Sale	$1,188,000 (Jun 2018)
Tax Bill	$16,951 (2025)
Deeds & Mortgages	Jun 2018 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`8714-020-032`

Property Details

APN / Parcel Number

Primary APN	`8714-020-032`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Total Rooms	12 Rooms
Stories	2 Stories
Building Area	3,032 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1982
Effective Year Built	Effective 1982
Architectural Style	Conventional
Exterior Material	Stucco
Construction Type	Wood
Roof Type	Gable
Roof Material	Tile
Lot Area	12,690 sqft (0.291 acres)
Lot Dimensions	204 ft deep x 64 ft wide

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	21080 RUNNING BRANCH RD
City	DIAMOND BAR
State	CA
Zip	91765-3767
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	LCR19000*
Legal Description	*TR=29053 LOT 38
Legal Subdivision	29053
Legal Tract	29053
Legal Block	2
Legal Lot Number	38
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	2
Census Block	2012
Census Tract	403325

Owner

21080 Running Branch Rd is owned by a company that bought it in June 2018 and is owner-occupied.

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

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

Owner of Record	2 Company Names on File
Mailing Address	21080 RUNNING BRANCH RD, DIAMOND BAR, CA 91765-3767
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Borrower in Default

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Jun 12, 2018 · Amount on File
Deed Sale	Jun 12, 2018 · Amount on File
Prior Sale	Aug 2, 2013 · Amount on File
Deed Document Number	2018579540
Prior Transfer Date	Jul 15, 2013
Prior Transfer Doc	0001137853
Record Updated	Oct 29, 2026

June 2018: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	LOS ANGELES CA
Recording Date	Jun 12, 2018
Property Address	21080 RUNNING BRANCH RD, DIAMOND BAR, CA 91765-3767
Document Number	0000579540
Map Reference	MB 909 PG 9-13
Instrument Date	May 11, 2018
Instrument	18-0579540
Transaction Type	Transfer
Record Updated	Sep 22, 2021
Title Company	STEWART TITLE

Transaction

Amount	Amount on Record
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	21080 RUNNING BRANCH RD, DIAMOND BAR, CA 91765-3767
Investor	Possibly a Property Investor

Mortgage

Document Number	0000579541
Date	Jun 12, 2018
Instrument	18-0579541

Lender

Name	WELLS FARGO BANK NA
Type	Bank

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	Jul 1, 2048

Tax Assessment & Valuation

The 2025 property tax bill for 21080 Running Branch Rd was $16,951 with a homeowner's exemption.

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	Walnut Valley Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$1,378,771 (+2%) Land $580,291 Building $798,480
2025	$16,951.00 Homeowner's exemption	$1,351,737 Land $568,913 Building $782,824
2023	$15,659.00 (+2.11%) Homeowner's exemption	$1,299,249 Land $546,822 Building $752,427
2022	$15,336.00

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

Flood

FEMA maps place 21080 Running Branch Rd in Zone X, an area of minimal flood risk.

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

Wildfire risk around 21080 Running Branch Rd is moderate, ranking above 62% of the US, with a 0.2% annual chance of wildfire.

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

Wildfire Risk	Moderate above 62% of the US · lower than 62% of California
Wildfire Likelihood	0.2% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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 565 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Spectrum Cable · Fiber in parts of the area	1,000 / 1,000
T-Mobile Fixed Wireless	100 / 20
AT&T Fixed Wireless	100 / 20

May also be available: Frontier, Verizon.

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