637 Mount St, Diamond Bar, CA 91765 Property Records

Los Angeles County property record for 637 Mount St, Diamond Bar, CA 91765

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 2,324 sqft · built 1972
Lot Size	0.312 acres (13,569 sqft)
Owner	2 Company Names on File
Last Sale	$409,000 (May 2003)
Tax Bill	$8,373 (2025)
Deeds & Mortgages	May 2019 Mortgage Jun 2020 Line of Credit + 1 more
Flood Zone	Zone X (minimal risk)
APN	`8717-021-018`

Property Details

APN / Parcel Number

Primary APN	`8717-021-018`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Total Rooms	12 Rooms
Stories	2 Stories
Building Area	2,324 sqft Living Area
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1972
Effective Year Built	Effective 1972
Architectural Style	Conventional
Exterior Material	Stucco
Construction Type	Wood
Roof Type	Gable
Roof Material	Wood Shingle
Lot Area	13,569 sqft (0.312 acres)
Lot Dimensions	141 ft deep x 94 ft wide
Garage Type	Attached

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central
Water Source	Commercial

Location & Zoning

Street Address	637 MOUNT ST
City	DIAMOND BAR
State	CA
Zip	91765-1939
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	LCR18000*
Legal Description	TRACT NO 31139 LOT 18
Legal Subdivision	31139
Legal Tract	31139
Legal Block	2
Legal Lot Number	18
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	2
Census Block	2001
Census Tract	403319

Owner

637 Mount St is owned by a company that bought it in May 2003.

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

Owner of Record	2 Company Names on File
Mailing Address	637 MOUNT ST, DIAMOND BAR, CA 91765-1939
Owner Type	Company
Vesting	Borrower in Default

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
May 30, 2019	Deed of Trust, Mortgage · ARM JPMORGAN CHASE BANK NA
Jun 5, 2020	Deed of Trust, Mortgage · Line of Credit WELLS FARGO BANK NA
Jul 26, 2019	Quit Claim Deed, Transfer NOT AVAILABLE

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	May 9, 2003 · Amount on File
Deed Sale	May 9, 2003 · Amount on File
Prior Sale	Dec 4, 1995 · Amount on File
Deed Document Number	20031322035
Prior Transfer Date	Nov 29, 1995
Prior Transfer Doc	0001917224
Record Updated	Oct 29, 2026

May 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	637 MOUNT ST, DIAMOND BAR, CA 91765-1939
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	AMROCK TITLE CALIFORNIA INC

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000495773
Date	May 30, 2019
Instrument	19-0495773

Lender

Name	JPMORGAN CHASE BANK NA
Type	Bank
Address	COLUMBUS, OH 43240

Agreement

Type	ARM
Amount	Amount on Record
Term	361 Months
Due	Jun 1, 2049

Interest

Rate Type	Adjustable Rate
Rate	3.87%
Type Change Date	Jun 1, 2029
Change Frequency	Annually
Min Rate At Change	2.25%
Max Rate At Change	8.87%
Index	1-Year LIBOR
Max Rate	8.87%

June 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	637 MOUNT ST, DIAMOND BAR, CA 91765-1939
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	ACCURATE GROUP LLC

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000614743
Date	Jun 5, 2020
Instrument	20-0614743

Lender

Name	WELLS FARGO BANK NA
Type	Bank
Address	SIOUX FALLS, SD 57104

Agreement

Type	Line of Credit
Amount	Amount on Record
Term	360 Months
Due	Jun 26, 2050

July 2019: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	LOS ANGELES CA
Recording Date	Jul 26, 2019
Property Address	637 MOUNT ST, DIAMOND BAR, CA 91765-1939
Document Number	0000733817
Instrument Date	Jun 20, 2019
Instrument	733817
Transaction Type	Transfer
Record Updated	Aug 16, 2019
Title Company	NOT AVAILABLE

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Revocable Trust
Address	637 MOUNT ST DIAMOND BAR CA 917651939, DIAMOND BAR, CA 91765-1939

Tax Assessment & Valuation

The 2025 property tax bill for 637 Mount St was $8,373.

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	Pomona Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$604,194 (+2%) Land $384,235 Building $219,959
2025	$8,373.00	$592,348 Land $376,701 Building $215,647
2023	$7,462.00 (+1.57%)	$569,348 Land $362,074 Building $207,274
2022	$7,347.00

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

Flood

FEMA maps place 637 Mount St 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

The area around 637 Mount St has no burnable land within ember reach, so its wildfire risk is not rated.

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

Provider	Max Down / Up (Mbps)
Spectrum Cable	1,000 / 1,000
AT&T Fixed Wireless	100 / 20

May also be available: GeoLinks, T-Mobile, Verizon.

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