23138 Rio Lobos Rd, Diamond Bar, CA 91765 Property Records

Los Angeles County property record for 23138 Rio Lobos Rd, Diamond Bar, CA 91765

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 1,747 sqft · built 1984
Lot Size	0.152 acres (6,628 sqft)
Owner	2 Individual Names on File
Last Sale	$539,000 (Dec 2012)
Tax Bill	$8,462 (2025)
Deeds & Mortgages	Feb 2022 Mortgage Jul 2021 Mortgage + 2 more
Flood Zone	Zone X (minimal risk)
APN	`8717-029-039`

Property Details

APN / Parcel Number

Primary APN	`8717-029-039`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Total Rooms	11 Rooms
Stories	2 Stories
Building Area	1,747 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1984
Effective Year Built	Effective 1984
Architectural Style	Conventional
Exterior Material	Stucco
Construction Type	Wood
Roof Type	Gable
Roof Material	Tile
Lot Area	6,628 sqft (0.152 acres)

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	23138 RIO LOBOS RD
City	DIAMOND BAR
State	CA
Zip	91765-4134
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	LCR3800025
Legal Description	*TR=37034 LOT 28
Legal Subdivision	37034
Legal Tract	37034
Legal Block	2
Legal Lot Number	28
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	2
Census Block	2009
Census Tract	403319

Owner

23138 Rio Lobos Rd is owned and occupied by two individuals who bought it in December 2012.

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

Owner of Record	2 Individual Names on File
Mailing Address	23138 RIO LOBOS RD, DIAMOND BAR, CA 91765-4134
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

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
Feb 3, 2022	Deed of Trust, Mortgage · Conventional Mortgage SUMMIT MORTGAGE BANKERS INC
Jul 2, 2021	Deed of Trust, Mortgage · Conventional Mortgage SUMMIT MORTGAGE BANKERS INC
Aug 1, 2017	Deed of Trust, Mortgage · Conventional Mortgage SUMMIT MORTGAGE BANKERS INC
Jul 24, 2020	Deed of Trust, Mortgage · Conventional Mortgage SUMMIT MORTGAGE BANKERS INC

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Dec 31, 2012 · Amount on File
Deed Sale	Dec 31, 2012 · Amount on File
Prior Sale	Sep 12, 1994 · Amount on File
Deed Document Number	20122033303
Prior Transfer Date	Sep 8, 1994
Prior Transfer Doc	0001666613
Record Updated	Oct 29, 2026

February 2022: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	23138 RIO LOBOS RD, DIAMOND BAR, CA 91765-4134
Transaction Type	Mortgage
Record Updated	Feb 10, 2022
Title Company	WFT NATIONAL TITLE, WFG NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	23138 RIO LOBOS RD, DIAMOND BAR, CA 91765-4134

Mortgage

Document Number	0000139556
Date	Feb 3, 2022
Instrument	22-0139556

Lender

Name	SUMMIT MORTGAGE BANKERS INC
Type	Mortgage Company
Address	FLUSHING, NY 11354

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	181 Months
Due	Mar 1, 2037

July 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	23138 RIO LOBOS RD, DIAMOND BAR, CA 91765-4134
Transaction Type	Mortgage
Record Updated	Jul 21, 2021
Title Company	WFG NATIONAL TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	23138 RIO LOBOS RD, DIAMOND BAR, CA 91765-4134

Mortgage

Document Number	0001038921
Date	Jul 2, 2021
Instrument	21-1038921

Lender

Name	SUMMIT MORTGAGE BANKERS INC
Type	Mortgage Company
Address	FLUSHING, NY 11354

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	360 Months
Due	Jul 1, 2051

August 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	23138 RIO LOBOS RD, DIAMOND BAR, CA 91765-4134
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	WFG NATIONAL TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000867309
Date	Aug 1, 2017
Instrument	17-0867309

Lender

Name	SUMMIT MORTGAGE BANKERS INC
Type	Mortgage Company
Address	FLUSHING, NY 11354

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	180 Months
Due	Aug 1, 2032

July 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	23138 RIO LOBOS RD, DIAMOND BAR, CA 91765-4134
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	WFG NATIONAL TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000829298
Date	Jul 24, 2020
Instrument	20-0829298

Lender

Name	SUMMIT MORTGAGE BANKERS INC
Type	Mortgage Company
Address	FLUSHING, NY 11354

Agreement

Type	Conventional Mortgage
Amount	Amount on Record
Term	181 Months
Due	Aug 1, 2035

Tax Assessment & Valuation

The 2025 property tax bill for 23138 Rio Lobos Rd was $8,462 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		$676,999 (+2%) Land $358,598 Building $318,401
2025	$8,462.00 Homeowner's exemption	$663,725 Land $351,567 Building $312,158
2023	$7,865.00 (+2.14%) Homeowner's exemption	$637,954 Land $337,916 Building $300,038
2022	$7,700.00

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

Flood

FEMA maps place 23138 Rio Lobos Rd 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

Wildfire risk around 23138 Rio Lobos Rd is moderate, ranking above 52% of the US, with a 0.09% annual chance of wildfire.

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

Wildfire Risk	Moderate above 52% of the US · lower than 69% of California
Wildfire Likelihood	0.09% annual chance
Exposure	Direct burnable vegetation

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

Provider	Max Down / Up (Mbps)
Spectrum Cable · Fiber in parts of the area	1,000 / 1,000
Verizon Fixed Wireless	300 / 20
Starlink Satellite	280 / 30
T-Mobile Fixed Wireless	100 / 20
AT&T Fixed Wireless	100 / 20

May also be available: Frontier, GeoLinks.

Cell Coverage

5G (outdoors only) and 4G LTE

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