421 W 4th St, San Dimas, CA 91773 Property Records

Los Angeles County property record for 421 W 4th St, San Dimas, CA 91773

Property Summary

Property Type	Single Family Home
Details	3 bd · 2 ba · 1,410 sqft · built 1965
Lot Size	0.158 acres (6,899 sqft)
Owner	2 Individual Names on Record
Last Sale	$580,000 (Sep 2020)
Tax Bill	$7,946 (2025)
Deeds & Mortgages	May 2021 Mortgage Sep 2020 Sale & Mortgage
Flood Zone	Zone X (minimal risk)
APN	`8386-012-018`

Property Details

APN / Parcel Number

Primary APN	`8386-012-018`

Interior

Bedrooms	3 Beds
Full Baths	2 Baths
Total Rooms	10 Rooms
Stories	1 Story
Building Area	1,410 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1965
Effective Year Built	Effective 1965
Architectural Style	Conventional
Exterior Material	Stucco
Construction Type	Wood
Roof Type	Hip
Roof Material	Gravel
Lot Area	6,899 sqft (0.158 acres)
Lot Dimensions	140 ft deep x 50 ft wide

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central
Water Source	Commercial

Location & Zoning

Street Address	421 W 4TH ST
City	SAN DIMAS
State	CA
Zip	91773-2009
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	SDMFD*
Legal Description	TRACT # 383 LOT 19
Legal Subdivision	383
Legal Tract	383
Legal Block	2
Legal Lot Number	19
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	2
Census Block	2008
Census Tract	401311

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	421 W 4TH ST, SAN DIMAS, CA 91773-2009
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

Deeds, Mortgages & Sale History

Date	Document
May 21, 2021	Deed of Trust, Mortgage · Conventional Mortgage SUMMIT FUNDING INC
Sep 4, 2020	Grant Deed, Transfer · FHA Mortgage SUMMIT FUNDING INC

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Sep 4, 2020 · Amount on Record
Deed Sale	Sep 4, 2020 · Amount on Record
Deed Document Number	20201062755
Record Updated	Oct 29, 2026

May 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	421 W 4TH ST, SAN DIMAS, CA 91773-2009
Transaction Type	Mortgage
Record Updated	Jun 3, 2021
Title Company	E-CHICAGO TITLE, CHICAGO TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	421W W 4TH ST, SAN DIMAS, CA 91773-2009

Mortgage

Document Number	0000823070
Date	May 21, 2021
Instrument	21-0823070

Lender

Name	SUMMIT FUNDING INC
Type	Mortgage Company
Address	SACRAMENTO, CA 95815

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Jun 1, 2051

September 2020: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	LOS ANGELES CA
Recording Date	Sep 4, 2020
Property Address	421 W 4TH ST, SAN DIMAS, CA 91773-2009
Document Number	0001062755
Map Reference	MB 15 PG 125
Instrument Date	Aug 6, 2020
Instrument	20-1062755
Transaction Type	Transfer
Record Updated	Sep 22, 2021
Title Company	PROVIDENT TITLE COMPANY

Transaction

Amount	Amount Recorded
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	Joint Tenants
Address	421 W 4TH ST, SAN DIMAS, CA 91773-2009

Mortgage

Document Number	0001062756
Date	Sep 4, 2020
Instrument	20-1062756

Lender

Name	SUMMIT FUNDING INC
Type	Mortgage Company

Agreement

Type	FHA Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Oct 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	San Dimas City
Unified School District	Bonita Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$640,362 (+2%) Land $497,056 Building $143,306
2025	$7,946.00 (+7.44%)	$627,807 (+4.04%) Land $487,310 Building $140,497
2023	$7,396.00 (+1.65%)	$603,431 Land $468,388 Building $135,043
2022	$7,276.00

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	GSWC-SAN DIMAS private · serves 56,564 people · EPA ID CA1910142
Water Source	Purchased surface water from several systems
Last State Inspection	May 2025
Also Mapped Here	METROPOLITAN WATER DIST. OF SO. CAL.
Lead	2 ppb (2024–2026) 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 517 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 / 1,000
Verizon Fixed Wireless	300 / 20
T-Mobile Fixed Wireless	100 / 20

May also be available: GeoLinks.

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