21230 Cold Spring Ln, Diamond Bar, CA 91765

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Off Market Jul 2011 for $460K

$1,005,947

Est. refi paymentEst. refi $2,992/mo

•

1,720

sq ft

21230 Cold Spring Ln, Diamond Bar, CA 91765

About this home

Upgraded home in Diamond Bar with Newer Wood Flooring, Granite counter top, Newer Paint, Upgrade Bathroom, Shower Booth, Lighting Fixtures, Ceiling Fans, and Much More. Updated A/C, Heater, Electric System, and Plumbing. Great Floor Plan with Living Room, Dining Area, Huge family room, Master Bedroom, Master Bathroom, and Covered Patio. Easy Access to 60 and 57 freeway, Walking distance to Elementary school, Diamond Bar High and Market place. Beautiful House, you must see!

Single-familyProperty Type

1962Year Built

7,800 sq ftLot Size

$585Est. Price/Sq.Ft.

2 car garageParking

Listed by Brian Yang •DRE #01856389 • New Star Realty & Inv.

Bought with Lishia Wang •DRE #01346210 • Re/Max Premier Realty

Redfin checked: 2 minutes ago

•Source:CRMLS #H11073693

Redfin Estimate

$1,005,947

$546K since sold in July 2011$5,000 since August

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 7.4% higher than the average sale price ($936K) of 6 comparable homes.

SOLD JUL 31, 2026
$875,000
A
3 beds2 baths1,300 sq ft
21245 Cold Spg, Diamond Bar, CA 91765
SOLD JUL 31, 2026
$975,000
B
3 beds2 baths1,300 sq ft
2606 Castle Rock Rd, Diamond Bar, CA 91765
Synergy Real Estate
SOLD FEB 27, 2026
$1,030,000
C
4 beds2 baths1,756 sq ft
2710 Castle Rock Rd, Diamond Bar, CA 91765
SOLD FEB 26, 2026
$880,000
D
3 beds2 baths1,280 sq ft
2632 Castle Rock, Diamond Bar, CA 91765
SOLD JUL 16, 2026
$958,600
E
3 beds2 baths1,372 sq ft
2127 Evergreen Springs Dr, Diamond Bar, CA 91765
Keller Williams Premier Prop
SOLD NOV 6, 2025
$900,000
F
3 beds2 baths1,300 sq ft
21223 Fountain Spgs, Diamond Bar, CA 91765

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Earn from this home

Sell

$716,363

Est. take-home

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Refinance

Est. cash available

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Rent

$3,227/mo

Redfin rental estimate

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Market trends in 91765, CA

Last updated August 2026

Buyer's Market

Seller's Market

Seller's market

Sale-to-List Price

99.1%

0.2% MoM

Median sale price

$1.1M

$48K MoM

Avg. days on market

42d

0 days MoM

Recently sold homes

108

17 MoM

New listings for sale

COMING SOON
$585,000
2 beds2.5 baths1,012 sq ft
1109 Golden Springs Dr Unit D, Diamond Bar, CA 91765
OPEN TODAY, 12PM TO 4PM
$1,648,000
4 beds3 baths3,212 sq ft
3315 Hawkwood, Diamond Bar, CA 91765
First Team Real Estate
$5,380,000
6 beds7 baths9,038 sq ft
2828 Water Course Dr, Diamond Bar, CA 91765
OPEN TODAY, 1PM TO 3PM
$1,199,999
4 beds2.5 baths1,915 sq ft
23308 Quail Smt, Diamond Bar, CA 91765
$818,800
3 beds3 baths1,570 sq ft
22935 Estoril Dr #6, Diamond Bar, CA 91765
OPEN TODAY, 1PM TO 3PM
$1,690,000
4 beds3 baths2,587 sq ft
1515 Sunbluff Dr, Diamond Bar, CA 91765
OPEN TODAY, 2PM TO 5PM
$538,000
3 beds2 baths1,047 sq ft
800 Grand Ave Unit D1, Diamond Bar, CA 91765
$1,070,000
4 beds2.5 baths1,893 sq ft
24126 Silver Spray, Diamond Bar, CA 91765
OPEN TODAY, 11AM TO 2PM
$1,150,000
4 beds3 baths1,747 sq ft
1036 Cogburn Ln, Diamond Bar, CA 91765
$625,000
3 beds2.5 baths1,420 sq ft
1030 Golden Springs Dr Unit B, Diamond Bar, CA 91765
See all

Provided by Redfin

Sale history for 21230 Cold Spring Ln

Date

Event

Price

Public Records

Jul 1, 2011

Sold

$460,000

$267/sq ft

CRMLS #H11073693

Jul 1, 2011

Pending

—

Jul 1, 2011

Sold

$460,000

$267/sq ft

Jun 22, 2011

Pending

—

Jun 10, 2011

Listed

$458,900

$267/sq ft

Public Records

Jun 22, 2001

Sold

$250,000

$145/sq ft

CRMLS #H215637

Jul 16, 2001

Listing Removed

—

Apr 26, 2001

Listed

$258,000

$150/sq ft

Public Records

May 15, 1997

Sold

$177,000

$103/sq ft

Public Records

Dec 6, 1985

Sold

$110,000

$64/sq ft

Public Records

Aug 29, 1980

Sold

$91,000

$53/sq ft

Year

Property tax

Land + Additions

Assessment*

2025

$7,557 (+5.2%)

$345,408 + $232,365

$577,773

2024

$7,186 (+2.4%)

$345,408 + $232,365

$577,773

2023

$7,016 (+2.1%)

$338,636 + $227,809

$566,445

2022

$6,870 (+1.9%)

$331,997 + $223,343

$555,340

2021

$6,742 (+1.3%)

$325,488 + $218,964

$544,452

2020

$6,657 (+1.9%)

$319,106 + $214,671

$533,777

2019

$6,530 (+4.7%)

$315,834 + $212,470

$528,304

2018

$6,237 (+4.8%)

$309,642 + $208,304

$517,946

2017

$5,952 (+3.0%)

$297,619 + $200,216

$497,835

2016

$5,777 (−0.6%)

$297,619 + $200,216

$497,835

2015

$5,812

$291,784 + $196,291

$488,075

2014

$5,815 (+1.1%)

$281,773 + $189,556

$471,329

2012

$5,751 (+51.9%)

$280,500 + $188,700

$469,200

2011

$3,785 (+0.8%)

$275,000 + $185,000

$460,000

2010

$3,754 (+0.5%)

$183,709 + $110,317

$294,026

2009

$3,735 (+2.9%)

$182,337 + $109,493

$291,830

2008

$3,630

$182,771 + $109,754

$292,525

Tax history for 21230 Cold Spring Ln

Year

Property tax

Land + Additions

Assessment*

2025

$7,557 (+5.2%)

$345,408 + $232,365

$577,773

2024

$7,186 (+2.4%)

$345,408 + $232,365

$577,773

2023

$7,016 (+2.1%)

$338,636 + $227,809

$566,445

2022

$6,870 (+1.9%)

$331,997 + $223,343

$555,340

2021

$6,742 (+1.3%)

$325,488 + $218,964

$544,452

2020

$6,657 (+1.9%)

$319,106 + $214,671

$533,777

2019

$6,530 (+4.7%)

$315,834 + $212,470

$528,304

2018

$6,237 (+4.8%)

$309,642 + $208,304

$517,946

2017

$5,952 (+3.0%)

$297,619 + $200,216

$497,835

2016

$5,777 (−0.6%)

$297,619 + $200,216

$497,835

2015

$5,812

$291,784 + $196,291

$488,075

2014

$5,815 (+1.1%)

$281,773 + $189,556

$471,329

2012

$5,751 (+51.9%)

$280,500 + $188,700

$469,200

2011

$3,785 (+0.8%)

$275,000 + $185,000

$460,000

2010

$3,754 (+0.5%)

$183,709 + $110,317

$294,026

2009

$3,735 (+2.9%)

$182,337 + $109,493

$291,830

2008

$3,630

$182,771 + $109,754

$292,525

*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.

Public record

Public record
Zoning

Beds

Baths

Stories

—

Lot width

—

Lot depth

—

Lot size

7,757 Sq. Ft.

Year renovated

1963

Sq. Ft.

1,720

Year built

1962

Style

Single Family Residential

County

Los Angeles County

APN

8285025005

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Aug 31, 2026.

RLM

Low/Medium Density Residential District

The RLM zoning district is intended primarily for existing subdivided areas developed with detached single-family dwellings. The maximum allowed density for new residential subdivisions within this zoning district will be five dwellings per gross acre. The RLM zoning district is consistent with the low density residential land use category of the general plan.

Permitted uses

Include but are not limited to:

Housing-Single unit
Housing-Senior
Housing-Other
Infrastructure
Fire house
Police station
Park & open space

Property details

Parking

Parking / Garage Information
Attached Garage
# of Garage Spaces: 2

Interior

Laundry Information
Has Laundry
Inside

Kitchen Information
Appliances: Dishwasher, Garbage Disposal, Microwave, Oven, Stove
Has Appliances
Area

Bathroom Information
# of Baths (Full): 2

Cooling Information
Central
Has Cooling

Room Information
Living Room, Primary Bedroom, Separate Family Room

Fireplace Information
Living Room
Has Fireplace

Flooring Information
Carpet, Wood

Heating Information
Forced Air
Has Heating

Interior Features
Levels: One

Exterior

Exterior Information
Fencing: Brick Wall
Has Fence

Exterior Features
Patio And Porch Features: Patio
Has Patio
Pool Features: None

Lot Information
Lot Size Source: Estimated

Property Information
Living Area Source: Assessor's Data
Parcel Number: 8285025005
Property Condition: Turnkey
Year Built Source: See Remarks

Financial

Assesments Information
Assessments: Unknown

Utilities

Utilities Information
Water Source: District/Public

Location

Neighborhood Information
Community Features: Sidewalks

School Information
High School District: Walnut Valley Unified

Location Information
Latitude: 33.97461300
Longitude: -117.84191400

Public facts

Beds: 3
Baths: 2.0
Sq. Ft.: 1,720
Stories: —
Lot Size: 7,757 square feet
Style: Single Family Residential
Year Built: 1962
Year Renovated: 1963
County: Los Angeles County
APN: 8285025005

Home facts updated by county records on Aug 31, 2026

Other

Listing Information
Days Active in MLS: 24
Continuous Days Active in MLS: 24

Listing Agent Information
List Agent First Name: Brian
List Agent Last Name: Yang

Listing Office Information
List Office Name: New Star Realty & Inv.

Selling Agent Information
Buyer Agent First Name: Lishia
Buyer Agent Last Name: Wang

Around this home

Schools

Castle Rock Elementary School

Public K-5 • Assigned • 0.2mi

10/10

South Pointe Middle School

Public 6-8 • Assigned • 1.2mi

10/10

Diamond Bar High School

Public 9-12 • Assigned • 0.5mi

10/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Local insights from Redfin agents

The real estate market is becoming more balanced. Buyers have more inventory, more data, and more time to make informed decisions than they did a year ago. Well-priced homes are still moving quickly, but today’s market rewards preparation, strategy,...
2 months ago • Los Angeles County
Peter Santos
Redfin Premier agent
82 deals
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Climate risks

1/10 Flood Factor

Minimal risk of a flood reaching the building in the next 30 years

5/10 Fire Factor

4% chance of being in a wildfire in next 30 years

6/10 Heat Factor

7 days above 98° expected this year, 21 days in 30 years

1/10 Wind Factor

Minimal risk of severe winds over next 30 years

6/10 Air Factor

10 unhealthy days expected this year, 13 days in 30 years

Provided by First Street

Historical weather

Diamond Bar, CA • 91765

Average low and high temperatures (°F)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Sun exposure

In this area, properties receive around 9.5 hours in June and 6.9 hours in December, placing it above the U.S. average for solar exposure.

9.5 hrs

6.9 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$956,000 – $1.16M

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Home values near 21230 Cold Spring Ln

Data from public records.

Address	Redfin Estimate
21259 Cold Spring Lane, Diamond Bar, CA 3 Beds \| - Baths \| 1300 Sq. Ft.	$942,440
21239 Cold Spring Lane, Diamond Bar, CA 3 Beds \| 2 Baths \| 1280 Sq. Ft.	$887,621

Address	Redfin Estimate
21253 Cold Spring Lane, Diamond Bar, CA 3 Beds \| 2 Baths \| 1252 Sq. Ft.	$916,992
21231 Cold Spring Lane, Diamond Bar, CA 3 Beds \| 2 Baths \| 1280 Sq. Ft.	$887,791

Address	Redfin Estimate
21245 Cold Spring Lane, Diamond Bar, CA 3 Beds \| 2 Baths \| 1300 Sq. Ft.	$899,708
21225 Cold Spring Lane, Diamond Bar, CA 3 Beds \| 2 Baths \| 1415 Sq. Ft.	$881,052

Property information provided by CRMLS when last listed in 2011. This data may not match . Learn more.

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GreatSchools Ratings provided by GreatSchools.org.

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About this home

Redfin Estimate

Earn from this home

Market trends in 91765, CA

Sale history for 21230 Cold Spring Ln

Tax history for 21230 Cold Spring Ln

Public record

Property details

Around this home

Schools

Lifestyle

Local insights from Redfin agents

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 91765

Home values near 21230 Cold Spring Ln

More real estate resources