578 Topside Pl, Diamond Bar, CA 91765 Property Records

Los Angeles County property record for 578 Topside Pl, Diamond Bar, CA 91765

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 2,405 sqft · built 1988
Lot Size	0.185 acres (8,046 sqft)
Owner	2 Individual Names on Record
Tax Bill	$5,010 (2025)
Deeds & Mortgages	Nov 2021 Mortgage Aug 2020 Mortgage + 1 more
Flood Zone	Zone X (minimal risk)
APN	`8281-035-097`

Property Details

APN / Parcel Number

Primary APN	`8281-035-097`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Building Area	2,405 sqft Living Area

Exterior

Year Built	Built 1988
Effective Year Built	Effective 1988
Construction Type	Wood
Lot Area	8,046 sqft (0.185 acres)
Lot Dimensions	84 ft deep x 96 ft wide

Utilities, Heating & Cooling

Cooling System	Central
Heating System	Central

Location & Zoning

Street Address	578 TOPSIDE PL
City	DIAMOND BAR
State	CA
Zip	91765-1878
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	LCR115000-
Legal Description	TR=36813 LOT 52
Legal Subdivision	36813
Legal Tract	36813
Legal Block	1
Legal Lot Number	52
Jurisdiction	LOS ANGELES CA
Township / Civil Division	EAST SAN GABRIEL VALLEY
Census Block Group	1
Census Block	1000
Census Tract	403321

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	578 TOPSIDE PL, DIAMOND BAR, CA 91765-1878
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Joint Tenants

Deeds, Mortgages & Sale History

Date	Document
Nov 18, 2021	Deed of Trust, Mortgage · Commercial Mortgage SPRING EQ LLC
Aug 31, 2020	Deed of Trust, Mortgage · Conventional Mortgage QUICKEN LOANS LLC
May 15, 2017	Quit Claim Deed, Transfer · Conventional Mortgage QUICKEN LNS

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Transfer Date	May 3, 2017
Transfer Doc	0000536030
Record Updated	Oct 29, 2026

November 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	578 TOPSIDE PL, DIAMOND BAR, CA 91765-1878
Transaction Type	Mortgage
Record Updated	Dec 1, 2021

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	578 TOPSIDE PL, DIAMOND BAR, CA 91765-1878

Mortgage

Document Number	0001716529
Date	Nov 18, 2021
Instrument	21-1716529

Lender

Name	SPRING EQ LLC
Type	Mortgage Company
Address	PHILADELPHIA, PA 19104

Agreement

Type	Commercial Mortgage
Amount	Amount Recorded
Term	360 Months
Due	Nov 10, 2051

August 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	LOS ANGELES CA
Property Address	578 TOPSIDE PL, DIAMOND BAR, CA 91765-1878
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	OLD REPUBLIC TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	578 TOPSIDE PL, DIAMOND BAR, CA 91765-1878

Mortgage

Document Number	0001023460
Date	Aug 31, 2020
Instrument	20-1023460

Lender

Name	QUICKEN LOANS LLC
Type	Mortgage Company
Address	DETROIT, MI 48226

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	349 Months
Due	Sep 1, 2049

May 2017: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	LOS ANGELES CA
Recording Date	May 15, 2017
Property Address	578 TOPSIDE PL, DIAMOND BAR, CA 91765-1878
Document Number	0000536030
Instrument Date	May 3, 2017
Instrument	536030
Transaction Type	Transfer
Record Updated	May 19, 2017
Title Company	OLD REPUBLIC TITLE

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants with Right of Survivorship
Address	578 TOPSIDE PL DIAMOND BAR CA 917651878, DIAMOND BAR, CA 91765-1878

Mortgage

Document Number	536031
Date	May 15, 2017
Instrument	536031

Lender

Name	QUICKEN LNS
Type	Funding / Finance Company
Address	DETROIT, MI 48226-1906

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	360 Months
Due	May 14, 2047

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	Diamond Bar City
Unified School District	Pomona Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$339,479 (+2%) Land $101,892 Building $237,587
2025	$5,010.00 (+13.4%) Homeowner's exemption	$332,824 (+4.04%) Land $99,895 Building $232,929
2023	$4,418.00 (+1.63%) Homeowner's exemption	$319,902 Land $96,017 Building $223,885
2022	$4,347.00

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	Moderate above 57% of the US · lower than 66% of California
Wildfire Likelihood	0.1% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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 487 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
AT&T Fixed Wireless	100 / 20

May also be available: GeoLinks.

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