Los Angeles County  »  21057 Topaz Ln

21057 Topaz Lane, Diamond Bar, CA 91765 - Property report

Also known as: 21057 Topaz Ln

Property image for 21057 Topaz Lane, Diamond Bar, CA 91765
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Property type

Single Family Residence (0100)

Year built

1998

Acreage

0.192

Sale price

$1,120,011

General Information

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Access up-to-date information from property owner names to sales history, deeds, tax info, mortgages, development data, planimetric maps and more.

Address
Primary address
21057 Topaz Ln
Diamond Bar, CA 91765
Zip code
91765
County
Los Angeles
Municipality
Diamond Bar

Owner

Find out who owns 21057 Topaz Lane, Diamond Bar, CA 91765. Uncover corporate and individual owners with a free account.

Building
Property type
Single Family Residence
Building sq. ft.
4,521
Buildings on lot
1
Year built
1998
Last altered
Bedrooms
5
Bathrooms
5
HVAC
Central refrigeration & heating
Sales
Sale date
12/29/2010
Sale price
$1,120,011
Arm's length
Tax
Tax year
2025-2026
Property tax
$17,140
Tax per sq. ft.
$4
Zoning & use
Zoning
Low Density Residential (RL)
Units
1
Lot
Acreage
0.192

Area overview

Walk score
26 /100.  Car-Dependent
Transit score
0 /100.  Minimal Transit
Bike score
20 /100.  Somewhat Bikeable
School district
Walnut Valley Unified School District
Weed hazard
No
Ownership

Ownership information for 21057 Topaz Lane, Diamond Bar, CA

Property owner name
Registered owner
Source
Deed
Owner contact information
Phone number
Owner address
Documents

Sales history for 21057 Topaz Lane, Diamond Bar, CA 91765

Sale date Sale price Buyer name Seller name
12/29/2010 $1,120,011 XXXX XXX XXXX XXXX XXXXXXXXXX
02/26/1999 $537,500 XXXX, XXXXXX & XXXXXXXXXX

*Most recent sales on record for this property.

More about Los Angeles County property records.

Title documents

Date Type Amount Party 1 Party 2
10/17/2025 Interspousal Transfer Grant Deed XX XXX-XXXX XXXX XXXXX XXXX
10/17/2025 Grant Deed
(File correction)		 XXXX XXX-XXXX XXXX XXXXX XXXX
12/29/2010 Deed
(Sale for consideration - full DTT - Single parcel sale)		 XXXX XXXXXXXXXX XXXX XXX XXXX
02/12/2008 Request Notice Default XXXX XXXXXXXXXX
02/12/2008 Assignment of Rents
Financing Statement
Trust Deed		 XXXX XXXXXXXXXX XXX XXXX XXXXXXXX XXXX
02/12/2008 Deed XXXX XXXXXX XXXX XXXXXXXXXX
02/11/2008 Deed XXXX, XXXXXX XXXX, XXXXXX & XXXXXXXXXX
01/23/2003 Deed
(File correction - Single parcel sale)		 XXXX, XXXXXX & XXXXXXXXXX XXXX, XXXXXX
02/26/1999 Deed XXXX, XXXXXX & XXXXXXXXXX

*Most recent recorded documents on file for this property.

R: Recorded date
D: Document date

Tax

Property taxes for 21057 Topaz Lane, Diamond Bar, CA

Property tax data includes tax amount, market value and assessed value, exemptions, abatements and assessment history.

Current property tax
Tax year
2025-2026
Base tax
$17,140
Current property tax
$18,169
Tax per sq. ft.
$4
Recent tax assessments
Market value
$1,463,600
Land value
$459,594
Building value
$1,004,006

More about Los Angeles County property taxes

Assessment history

See the assessment and property tax history, including the evolution of the total tax rate and corresponding property tax amount.

Tax year Assessed value Tax rate Property tax Y-o-Y change
2025-2026 $1,463,600 1.1711 $17,140 +3.43%
2024-2025 $1,434,903 1.1549 $16,572 +2.57%
2023-2024 $1,406,769 1.1485 $16,157 +2.10%
2022-2023 $1,379,187 1.1474 $15,825 +1.75%
2021-2022 $1,352,146 1.1502 $15,552 +1.31%
2020-2021 $1,338,282 1.147016 $15,350 +4.07%
2019-2020 $1,286,317 1.146694 $14,750 +3.17%
2018-2019 $1,261,096 1.1337 $14,297 +5.02%
2017-2018 $1,236,370 1.1011 $13,614 +2.71%
2016-2017 $1,212,129 1.0935 $13,255 -0.69%

Special assessments & penalties for 21057 Topaz Lane, Diamond Bar, CA

Code Description Tax levied
06221 County Sanitation District #21
14651 Diamond Bar District #38
06181 Greater L.A. County Vector Control District
03694 La County Regional Park And Open Space District
00744 Los Angeles County Fire Department
03071 Los Angeles County Flood Control
04000 Los Angeles County Sewer Maintenance
00170 Los Angeles County Trauma/Emerg Srvs
33011 Mwd Water Standby Charge #2
00177 Safe, Clean Water Program Funding Measure W
36551 Three Valleys Mwd Standby Charge
37092 Walnut Valley Water Standby
Permits

Permit information for 21057 Topaz Lane, Diamond Bar, CA

No recently recorded permits for this property.

More about Los Angeles County property records

Neighborhood

Diamond Bar residential market stats

Access a detailed real estate market overview of Diamond Bar so you can assess current trends, home values, types of properties sold and transaction volume. View the median home sale price in Diamond Bar and compare it to other neighborhoods in Los Angeles.

Median sale price

$1,012,500

10.3% Y-o-Y

Median price/sq. ft.

$566

0.4% Y-o-Y

Los Angeles county median sale price

$870,000

-0.6% Y-o-Y

Check out recently sold homes in Diamond Bar and see how their prices compare.

Risk

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FEMA flood zones

FEMA flood zones
X
Landslides and liquefaction map

Fire hazard zones

Faults and tsunami inundation zones map
Crime incidents map

Transportation

Daily traffic map
View daily traffic map

Access the detailed traffic volume map for 21057 Topaz Lane, Diamond Bar, CA 91765 to see estimated average daily traffic on streets surrounding the property as well as the types of properties in its vicinity.

Schools

Nearest elementary schools

Name Rating Type Grade range No of students Distance (miles)
Institute Of Knowledge NR Private K-8 127 0.61
Institute of Knowledge NR Private K-10 265 0.67
Discovery World Montessori School NR Private K-6 70 0.78
Discovery World Montessori NR Private K-4 19 0.78
Walnut Valley Adult NR Public 0 0.81
Walnut Elementary School 8 Public K-5 671 0.90
Dbc Children's Center NR Private PK-K 48 1.01
Evergreen Elementary School 9 Public K-5 719 1.03
Maple Hill Elementary School 9 Public K-5 562 1.17
Castle Rock Elementary School 7 Public K-5 646 1.31
Nearest middle schools

Name Rating Type Grade range No of students Distance (miles)
South Pointe Middle School 8 Public 6-8 879 0.24
Institute Of Knowledge NR Private K-8 127 0.61
Institute of Knowledge NR Private K-10 265 0.67
Walnut Valley Adult NR Public 0 0.81
International Cross Academy NR Private 1-12 0 1.01
Wisdom Kids College NR Private K-8 0 1.50
Elite Open School NR Private 5-12 43 1.57
Ybarra Academy For The Arts And Technology 7 Public K-8 596 1.61
Chaparral Middle School 9 Public 6-8 1,133 1.61
Suzanne Middle School 8 Public 6-8 1,120 2.31
Nearest high schools

Name Rating Type Grade range No of students Distance (miles)
Institute of Knowledge NR Private K-10 265 0.67
Walnut Valley Adult NR Public 0 0.81
Diamond Bar High School 10 Public 9-12 2,557 0.85
International Cross Academy NR Private 1-12 0 1.01
Ron Hockwalt Academies (Continuation) School NR Public 9-12 41 1.36
Elite Open School NR Private 5-12 43 1.57
Walnut High School 10 Public 9-12 2,158 2.12
Aims Academy NR Private 1-12 0 2.28
John A. Rowland High School 8 Public 9-12 2,025 2.42
Rowland Unified Community Day School NR Public 7-12 31 2.58

Data provided by GreatSchools.org © 2026. All rights reserved.

Neighbors for 21057 Topaz Lane, Diamond Bar, CA

1549 Ruby CT, Diamond Bar 1538 Emerald Ln, Diamond Bar 1518 Emerald Ln, Diamond Bar 1511 Ruby CT, Diamond Bar 1578 Emerald Ln, Diamond Bar 1548 Emerald Ln, Diamond Bar 1500 Ruby CT, Diamond Bar 1548 Ruby CT, Diamond Bar 1508 Emerald Ln, Diamond Bar 1538 Ruby CT, Diamond Bar 1535 Ruby CT, Diamond Bar 1528 Ruby CT, Diamond Bar 1588 Emerald Ln, Diamond Bar 21083 Topaz Ln, Diamond Bar 1508 Ruby CT, Diamond Bar 1518 Ruby CT, Diamond Bar 1558 Emerald Ln, Diamond Bar 21019 Topaz Ln, Diamond Bar 1568 Emerald Ln, Diamond Bar 1528 Emerald Ln, Diamond Bar

Nearby ZIP codes for 21057 Topaz Lane, Diamond Bar, CA

91722, Los Angeles County, CA 91723, Los Angeles County, CA 91724, Los Angeles County, CA 91744, Los Angeles County, CA 91748, Los Angeles County, CA 91768, Los Angeles County, CA 91773, Los Angeles County, CA 92821, Orange County, CA

Frequently asked questions

What is the year built for 21057 Topaz Lane, Diamond Bar, CA 91765?

The development at 21057 Topaz Lane, Diamond Bar, CA 91765 was built in 1998.

What is the total square footage of 21057 Topaz Lane, Diamond Bar, CA 91765?

21057 Topaz Lane, Diamond Bar, CA 91765 has a total of 4,521 square feet.

When was 21057 Topaz Lane, Diamond Bar, CA 91765 last sold and what was the sale price?

21057 Topaz Lane, Diamond Bar, CA 91765 was last sold on 12/29/2010 for $1,120,011.

What is the assessed value of 21057 Topaz Lane, Diamond Bar, CA 91765?

21057 Topaz Lane, Diamond Bar, CA 91765 is currently assessed at $1,463,600.

What are the property taxes for 21057 Topaz Lane, Diamond Bar, CA 91765?

The property taxes for 21057 Topaz Lane, Diamond Bar, CA 91765 total $17,140.

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