21719 Lost River Dr, Diamond Bar, CA 91765 Property Records

Los Angeles County property record for 21719 Lost River Dr, Diamond Bar, CA 91765

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,624 sqft · built 1963
Lot Size	0.206 acres (8,972 sqft)
Owner	2 Individual Names on Record
Last Sale	$650,000 (Oct 2016)
Tax Bill	$9,660 (2025)
Deeds & Mortgages	Oct 2019 Mortgage Nov 2020 Mortgage
Flood Zone	Zone X (minimal risk)
APN	`8285-007-026`

Property Details

APN / Parcel Number

Primary APN	`8285-007-026`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	9 Rooms
Stories	1 Story
Building Area	1,624 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1963
Effective Year Built	Effective 1972
Architectural Style	Conventional
Exterior Material	Stucco
Construction Type	Wood
Roof Type	Gable
Roof Material	Wood Shingle
Lot Area	8,972 sqft (0.206 acres)
Lot Dimensions	117 ft deep x 76 ft wide

Utilities, Heating & Cooling

Heating System	Central

Location & Zoning

Street Address	21719 LOST RIVER DR
City	DIAMOND BAR
State	CA
Zip	91765-3130
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	LCR171/2
Legal Description	TRACT NO 25987 LOT 99
Legal Subdivision	25987
Legal Tract	25987
Legal Block	1
Legal Lot Number	99
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	1
Census Block	1003
Census Tract	403325

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 Individual Names on Record
Mailing Address	2913 EL CAMINO REAL, TUSTIN, CA 92782-8909
Owner Type	Individual
Vesting	Community Property

Deeds, Mortgages & Sale History

Date	Document
Oct 8, 2019	Deed of Trust, Mortgage · Conventional Mortgage OWNING CORPORATION
Nov 18, 2020	Deed of Trust, Mortgage · Conventional Mortgage OWNING CORPORATION

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Oct 7, 2016 · Amount on Record
Deed Sale	Oct 7, 2016 · Amount on Record
Deed Document Number	20161233187
Prior Transfer Date	Oct 15, 2013
Prior Transfer Doc	0001517887
Record Updated	Oct 29, 2026

October 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	21719 LOST RIVER DR, DIAMOND BAR, CA 91765-3130
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	ORANGE COAST TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0001059959
Date	Oct 8, 2019
Instrument	19-1059959

Lender

Name	OWNING CORPORATION
Type	Non-Lending Institution
Address	ORANGE, CA 92868

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Nov 1, 2049

November 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	21719 LOST RIVER DR, DIAMOND BAR, CA 91765-3130
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	FIRST AMERICAN TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	21719 LOST RIVER DR, DIAMOND BAR, CA 91765-3130

Mortgage

Document Number	0001474184
Date	Nov 18, 2020
Instrument	20-1474184

Lender

Name	OWNING CORPORATION
Type	Non-Lending Institution
Address	ORANGE, CA 92868

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Dec 1, 2050

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	Walnut Valley Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$769,460 (+2%) Land $530,101 Building $239,359
2025	$9,660.00 (+7.13%)	$754,373 (+4.04%) Land $519,707 Building $234,666
2023	$9,017.00 (+2.11%)	$725,081 Land $499,527 Building $225,554
2022	$8,831.00

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 80% of the US · lower than 88% of California
Wildfire Likelihood	0.02% 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 437 locations within half a mile, as of December 31, 2025

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

May also be available: GeoLinks, Verizon.

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