21426 Running River Ct, Diamond Bar, CA 91765 Property Records

Los Angeles County property record for 21426 Running River Ct, Diamond Bar, CA 91765

Property Summary

Property Type	Single Family Home
Details	4 bd · 2 ba · 1,708 sqft · built 1977
Lot Size	0.174 acres (7,561 sqft)
Owner	2 Trust Names on File
Last Sale	$717,500 (Mar 2017)
Tax Bill	$10,482 (2025)
Deeds & Mortgages	Jan 2023 Transfer Apr 2018 Mortgage + 3 more
Flood Zone	Zone X (minimal risk)
APN	`8292-020-030`

Property Details

APN / Parcel Number

Primary APN	`8292-020-030`

Interior

Bedrooms	4 Beds
Full Baths	2 Baths
Total Rooms	10 Rooms
Stories	1 Story
Building Area	1,708 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1977
Effective Year Built	Effective 1977
Architectural Style	Conventional
Exterior Material	Stucco
Construction Type	Wood
Roof Type	Gable
Roof Material	Wood Shingle
Lot Area	7,561 sqft (0.174 acres)
Lot Dimensions	110 ft deep x 66 ft wide

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	21426 RUNNING RIVER CT
City	DIAMOND BAR
State	CA
Zip	91765-2753
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	LCR1*
Legal Description	*TR=28579 LOT 81
Legal Subdivision	28579
Legal Tract	28579
Legal Block	2
Legal Lot Number	81
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	2
Census Block	2002
Census Tract	403328

Owner

21426 Running River Ct is owner-occupied and held in a trust since January 2023.

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

Owner of Record	2 Trust Names on File
Mailing Address	21426 RUNNING RIVER CT, DIAMOND BAR, CA 91765-2753
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

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

Date	Document
Jan 26, 2023	Intrafamily Transfer, Transfer CALIFORNIA BEST TITLE
Apr 25, 2018	Deed of Trust, Mortgage · Conventional Mortgage PAUL YANG & CO INC
Apr 14, 2020	Deed of Trust, Mortgage · Conventional Mortgage PAUL YANG & CO INC
Mar 29, 2017	Quit Claim Deed, Transfer FIRST AMERICAN TITLE
Mar 29, 2017	Grant Deed, Transfer · ARM CATHAY BANK

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Mar 29, 2017 · Amount on File
Deed Sale	Mar 29, 2017 · Amount on File
Prior Sale	Oct 28, 2005 · Amount on File
Deed Document Number	2017347824
Last Transfer Date	Jan 18, 2023
Transfer Doc	0000053268
Record Updated	Oct 29, 2026

January 2023: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	LOS ANGELES CA
Recording Date	Jan 26, 2023
Property Address	21426 RUNNING RIVER CT, DIAMOND BAR, CA 91765-2753
Document Number	0000053268
Map Reference	MB 862 PG 40-46
Instrument Date	Jan 18, 2023
Instrument	23-0053268
Transaction Type	Transfer
Record Updated	Jun 7, 2023
Title Company	CALIFORNIA BEST TITLE

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	Revocable Trust
Address	21426 RUNNING RIVER CT, DIAMOND BAR, CA 91765-2753

April 2018: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	21426 RUNNING RIVER CT, DIAMOND BAR, CA 91765-2753
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	STEWART TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000399887
Date	Apr 25, 2018
Instrument	18-0399887

Lender

Name	PAUL YANG & CO INC
Type	Non-Lending Institution
Address	ROWLAND HEIGHTS, CA 91748

Agreement

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

April 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	21426 RUNNING RIVER CT, DIAMOND BAR, CA 91765-2753
Transaction Type	Mortgage
Record Updated	Feb 5, 2021

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000415254
Date	Apr 14, 2020
Instrument	20-0415254

Lender

Name	PAUL YANG & CO INC
Type	Non-Lending Institution
Address	ROWLAND HEIGHTS, CA 91748

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	361 Months
Due	May 1, 2050

March 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	LOS ANGELES CA
Recording Date	Mar 29, 2017
Property Address	21426 RUNNING RIVER CT, DIAMOND BAR, CA 91765-2753
Document Number	0000347823
Instrument Date	Feb 21, 2017
Instrument	347823
Transaction Type	Transfer
Record Updated	Apr 4, 2017
Title Company	FIRST AMERICAN TITLE

Transaction

Tax	$0.00
Amount Accuracy	Full Value
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Separate Estate/Property
Address	2657 TUSCANY WAY FULLERTON CA 928354222, FULLERTON, CA 92835-4222

March 2017: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	LOS ANGELES CA
Recording Date	Mar 29, 2017
Property Address	21426 RUNNING RIVER CT, DIAMOND BAR, CA 91765-2753
Document Number	0000347824
Map Reference	MB862 PG40-46
Instrument Date	Feb 21, 2017
Instrument	17-0347824
Transaction Type	Transfer
Record Updated	Sep 22, 2021
Title Company	FIRST AMERICAN TITLE COMPANY

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
Relationship	Community Property with Right of Survivorship
Address	21426 RUNNING RIVER CT, DIAMOND BAR, CA 91765-2753

Mortgage

Document Number	0000347825
Date	Mar 29, 2017
Instrument	17-0347825

Lender

Name	CATHAY BANK
Type	Bank

Agreement

Type	ARM
Amount	Amount on Record
Term	361 Months
Due	Apr 1, 2047

Interest

Rate Type	Adjustable Rate
Rate	4.25%
Adjustable	Adjustable Rate Rider
Type Change Date	Apr 1, 2020
Change Frequency	Annually
Min Rate At Change	3.75%
Max Rate At Change	10.2%
Index	1-Year CMT
Max Rate	10.2%

Tax Assessment & Valuation

The 2025 property tax bill for 21426 Running River Ct was $10,482 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		$849,366 (+2%) Land $537,203 Building $312,163
2025	$10,482.00 Homeowner's exemption	$832,713 Land $526,670 Building $306,043
2023	$9,751.00 (+2.14%) Homeowner's exemption	$800,380 Land $506,220 Building $294,160
2022	$9,547.00

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

Flood

FEMA maps place 21426 Running River Ct 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

The area around 21426 Running River Ct has no burnable land within ember reach, so its wildfire risk is not rated.

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

Wildfire Risk	Not rated no burnable land 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 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 441 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Spectrum Cable	1,000 / 35

May also be available: Frontier, T-Mobile, Verizon.

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