21036 Cornerstone Dr, Walnut, CA 91789 Property Records

Los Angeles County property record for 21036 Cornerstone Dr, Walnut, CA 91789

Property Summary

Property Type	Condominium
Details	4 bd · 3 ba · 1,760 sqft · built 2018
Owner	2 Company Names on File
Last Sale	$710,000 (May 2017)
Tax Bill	$10,240 (2025)
Deeds & Mortgages	Dec 2025 Transfer
Flood Zone	Zone X (minimal risk)
APN	`8720-047-091`

Property Details

APN / Parcel Number

Primary APN	`8720-047-091`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Building Area	1,760 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	21036 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 43 PH 2 CONDO UNIT 50 (AIRSPACE AND 1/9 INT IN COMMON AREA)
Legal Subdivision	GALLERY AT CORNERSTONE
Legal Tract	73294
Legal Block	2
Legal Lot Number	43
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 · APN 8720-047-091

Assessment roll updated May 21, 2026 · Last verified June 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 File
Mailing Address	1238 SADDLEHORN WAY, WALNUT, CA 91789-5349
Owner Type	Company
Vesting	Trust, Family Trust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	2 Verified Names on Deed
Last Sale	May 17, 2017 · Amount on Record
Deed Sale	May 17, 2017 · Amount on Record
Deed Document Number	2017547650
Record Updated	Sep 20, 2026

December 2025: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	LOS ANGELES CA
Recording Date	Dec 23, 2025
Property Address	21036 CORNERSTONE DR, WALNUT, CA 91789-2571
Document Number	0000932941
Map Reference	MB 1390 PG 37-44
Instrument Date	Dec 11, 2025
Instrument	25-0932941
Transaction Type	Transfer
Record Updated	Jan 08, 2026

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	Family Trust
Address	1238 SADDLEHORN WAY, WALNUT, CA 91789-5349

Tax Assessment & Valuation

Source: Los Angeles County records · Assessment roll updated May 21, 2026 · Last verified June 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

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

Year	Tax Bill	Assessed Value
2025	$10,240.00 (+7.7%)	$824,012 (+4.04%) Land $243,720 Building $580,292
2023	$9,508.00 (+2.14%)	$792,016 Land $234,257 Building $557,759
2022	$9,309.00

Flood & Wildfire

Source: FEMA National Flood Hazard Layer as of September 30, 2026 · USDA Forest Service Wildfire Risk to Communities as of 2024 · Last verified October 2026

Flood

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it

Wildfire

Wildfire Risk	Not rated no burnable land within ember reach

Values are read at the parcel center point; lenders make the official flood determination.

Internet Providers

Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026

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 USA Fixed Wireless	100 / 20
AT&T Fixed Wireless	100 / 20

May also be available: California Internet.

Based on FCC filings for 549 locations within half a mile of this property.

Drinking Water

Source: EPA Safe Drinking Water Information System as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026

Water System	WALNUT VALLEY WATER DISTRICT serves 100,941 people
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 as reported to EPA, not water tested at this address; lead at the tap also depends on the building's own pipes. The full violation and enforcement history is in the system's EPA record.