21000 Cornerstone Dr, Walnut, CA 91789 Property Records

Los Angeles County property record for 21000 Cornerstone Dr, Walnut, CA 91789

Property Summary

Property Type	Condominium
Details	4 bd · 3 ba · 1,830 sqft · built 2018
Owner	Individual Name on Record
Last Sale	$720,000 (Aug 2019)
Tax Bill	$9,835 (2025)
Deeds & Mortgages	Aug 2019 Sale Jan 2019 Transfer + 1 more
Flood Zone	Zone X (minimal risk)
APN	`8720-047-084`

Property Details

APN / Parcel Number

Primary APN	`8720-047-084`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Building Area	1,830 sqft Living Area

Exterior

Year Built	Built 2018
Effective Year Built	Effective 2018
Architectural Style	Condo/Apartment
Construction Type	Wood

Utilities, Heating & Cooling

Cooling System	HVAC
Heating System	Central

Location & Zoning

Street Address	21000 CORNERSTONE DR
City	WALNUT
State	CA
Zip	91789-2571
Property Category	Residential
Property Type	Residential > Condominium / Townhouse > Condominium
Local Zoning Code	WAC3*
Legal Description	TR=73294 LOT 42 PH 4 CONDO UNIT 43 (AIRSPACE AND 1/9 INT IN COMMON AREA)
Legal Subdivision	GALLERY AT CORNERSTONE
Legal Tract	73294
Legal Block	2
Legal Lot Number	42
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	2
Census Block	2011
Census Tract	403402

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	Individual Name on Record
Mailing Address	19498 JUNIPER BND, WALNUT, CA 91789-5373
Owner Type	Individual

Deeds, Mortgages & Sale History

Date	Document
Aug 27, 2019	Grant Deed, Transfer STEWART TITLE
Jan 7, 2019	Quit Claim Deed, Transfer Quitclaim
Jan 7, 2019	Quit Claim Deed, Transfer Quitclaim

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Aug 27, 2019 · Amount on Record
Deed Sale	Aug 27, 2019 · Amount on Record
Prior Sale	Oct 17, 2017 · Amount on Record
Deed Document Number	2019865016
Prior Transfer Date	Oct 19, 2018
Prior Transfer Doc	0000018007
Record Updated	Oct 29, 2026

August 2019: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	LOS ANGELES CA
Recording Date	Aug 27, 2019
Property Address	21000 CORNERSTONE DR, WALNUT, CA 91789-2571
Document Number	0000865016
Instrument Date	Aug 15, 2019
Instrument	865016
Transaction Type	Transfer
Record Updated	Aug 30, 2019
Title Company	STEWART TITLE

Transaction

Amount	Amount Recorded
Tax	$792.00
Amount Accuracy	Full Value
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	19498 JUNIPER BND WALNUT CA 917895373, WALNUT, CA 91789-5373

January 2019: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	LOS ANGELES CA
Recording Date	Jan 7, 2019
Property Address	21000 CORNERSTONE DR, WALNUT, CA 91789-2571
Document Number	0000018006
Instrument Date	Oct 19, 2018
Instrument	18006
Transaction Type	Transfer
Record Updated	Jan 18, 2019

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Separate Estate/Property
Address	21000 CORNERSTONE DR WALNUT CA 917892571, WALNUT, CA 91789-2571

January 2019: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	LOS ANGELES CA
Recording Date	Jan 7, 2019
Property Address	21000 CORNERSTONE DR, WALNUT, CA 91789-2571
Document Number	0000018007
Instrument Date	Oct 19, 2018
Instrument	18007
Transaction Type	Transfer
Record Updated	Jan 18, 2019

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Separate Estate/Property
Address	21000 CORNERSTONE DR WALNUT CA 917892571, WALNUT, CA 91789-2571

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	Walnut City
Unified School District	Walnut Valley Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$803,168 (+2%) Land $467,623 Building $335,545
2025	$9,835.00 (+7.8%)	$787,420 (+4.04%) Land $458,454 Building $328,966
2023	$9,123.00 (+2.12%)	$756,845 Land $440,652 Building $316,193
2022	$8,934.00

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

Provider	Max Down / Up (Mbps)
Frontier Fiber	7,000 / 7,000
Spectrum Cable · Fiber in parts of the area	1,000 / 1,000
Verizon Fixed Wireless	300 / 20
T-Mobile Fixed Wireless	100 / 20
AT&T Fixed Wireless	100 / 20

May also be available: GeoLinks.

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