21485 Cold Spring Ln, Diamond Bar, CA 91765

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Off Market Jul 2009 for $575K

$1,252,440

Est. refi paymentEst. refi $3,453/mo

•

2,037

sq ft

21485 Cold Spring Ln, Diamond Bar, CA 91765

About this home

Lovely 3 bed/ 2 bath, high ceiling, one story home with a den (has closet & can easily be used as a bedroom). Cozy Living room with fireplace; formal dining room adjacent to a bright, upgraded kitchen with maple cabinets and granite countertops. Family room opens into a well manicured backyard with a gazebo; great for entertainment. Close to shopping centers and private community of "The Country. "

Single-familyProperty Type

1977Year Built

0.3 acresLot Size

$615Est. Price/Sq.Ft.

3 car garageParking

Listed by Marina Andres •DRE #01025689 • Royal Pacific MTG & Realty

Bought with Helene Chen •DRE #01804401 • A + Realty & Mortgage

Redfin checked: a minute ago

•Source:CRMLS #H09042298

Redfin Estimate

$1,252,440

$677K since sold in July 2009$5,000 since August

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 1.7% higher than the average sale price ($1.23M) of 5 comparable homes.

SOLD MAY 14, 2026
$1,330,000
A
4 beds3 baths2,037 sq ft
3357 Bent Twig, Diamond Bar, CA 91765
SOLD FEB 26, 2026
$1,180,000
B
3 beds2 baths1,752 sq ft
21465 Running Br, Diamond Bar, CA 91765
SOLD AUG 14, 2026
$977,308
C
3 beds2 baths1,527 sq ft
20206 Evening Breeze Dr, Walnut, CA 91789
SOLD AUG 10, 2026
$1,163,000
D
4 beds2 baths1,780 sq ft
1934 Ano Nuevo, Diamond Bar, CA 91765
Pinnacle Real Estate Group
SOLD MAY 28, 2026
$1,505,000
E
4 beds3 baths2,712 sq ft
3249 Hawkwood Rd, Diamond Bar, CA 91765

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Earn from this home

Sell

$921,509

Est. take-home

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Refinance

Est. cash available

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Rent

$3,436/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

98.5%

0.6% MoM

Median sale price

$1.1M

$10K MoM

Avg. days on market

43d

1 days MoM

Recently sold homes

100

5 MoM

New listings for sale

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OPEN SAT, 11AM TO 2PM
$949,979
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227 N Pintado Dr, Diamond Bar, CA 91765
OPEN SAT, 1PM TO 4PM
$1,380,000
4 beds3 baths2,074 sq ft
1553 High Blf, Diamond Bar, CA 91765
NEW 18 HRS AGO
$1,699,000
4 beds3 baths3,802 sq ft
24030 Shotgun Ln, Diamond Bar, CA 91765
NEW 19 HRS AGO
$1,299,000
5 beds4 baths2,116 sq ft
1537 Meadow Gln, Diamond Bar, CA 91765
FOR SALE BY OWNER
$425,000
2 beds1 bath850 sq ft
22801 Hilton Head Dr, Diamond Bar, CA 91765
OPEN SAT, 12PM TO 4PM
$1,680,000
5 beds4 baths3,100 sq ft
20949 Ambushers St, Diamond Bar, CA 91765
OPEN SAT, 11AM TO 2PM
$946,000
3 beds4 baths1,700 sq ft
3199 Marigold, Diamond Bar, CA 91765
$1,195,000
3 beds2.5 baths2,031 sq ft
24237 Seagreen Dr, Diamond Bar, CA 91765
$1,350,000
5 beds3 baths2,585 sq ft
24435 Nan Ct, Diamond Bar, CA 91765
See all

Provided by Redfin

Sale history for 21485 Cold Spring Ln

Date

Event

Price

CRMLS #H09042298

Jul 8, 2009

Sold

$575,000

$282/sq ft

Jun 5, 2009

Listing Removed

—

May 27, 2009

Price Changed

$575,000

$282/sq ft

Apr 14, 2009

Listed

$595,000

$292/sq ft

CRMLS #H309095

Oct 6, 2003

Sold

$453,000

$222/sq ft

Aug 20, 2003

Listed

$459,888

$226/sq ft

Public Records

Dec 23, 1986

Sold

$176,500

$87/sq ft

Year

Property tax

Land + Additions

Assessment*

2025

$9,499 (+5.0%)

$369,038 + $373,170

$742,208

2024

$9,046 (+2.4%)

$369,038 + $373,170

$742,208

2023

$8,830 (+2.1%)

$361,802 + $365,853

$727,655

2022

$8,646 (+1.9%)

$354,708 + $358,680

$713,388

2021

$8,485 (+1.3%)

$347,753 + $351,648

$699,401

2020

$8,377 (+2.0%)

$340,935 + $344,753

$685,688

2019

$8,216 (+4.3%)

$337,440 + $341,218

$678,658

2018

$7,876 (+4.8%)

$330,824 + $334,528

$665,352

2017

$7,516 (+3.0%)

$317,979 + $321,539

$639,518

2016

$7,295 (−0.6%)

$317,979 + $321,539

$639,518

2015

$7,338 (−0.1%)

$311,745 + $315,235

$626,980

2014

$7,346 (+1.1%)

$301,049 + $304,418

$605,467

2012

$7,268 (+2.9%)

$261,000 + $264,000

$525,000

2011

$7,059 (+0.8%)

$293,813 + $297,101

$590,914

2010

$7,007 (+14.6%)

$288,052 + $291,276

$579,328

2009

$6,116 (+2.8%)

$285,900 + $289,100

$575,000

2008

$5,952

$304,725 + $195,420

$500,145

Tax history for 21485 Cold Spring Ln

Year

Property tax

Land + Additions

Assessment*

2025

$9,499 (+5.0%)

$369,038 + $373,170

$742,208

2024

$9,046 (+2.4%)

$369,038 + $373,170

$742,208

2023

$8,830 (+2.1%)

$361,802 + $365,853

$727,655

2022

$8,646 (+1.9%)

$354,708 + $358,680

$713,388

2021

$8,485 (+1.3%)

$347,753 + $351,648

$699,401

2020

$8,377 (+2.0%)

$340,935 + $344,753

$685,688

2019

$8,216 (+4.3%)

$337,440 + $341,218

$678,658

2018

$7,876 (+4.8%)

$330,824 + $334,528

$665,352

2017

$7,516 (+3.0%)

$317,979 + $321,539

$639,518

2016

$7,295 (−0.6%)

$317,979 + $321,539

$639,518

2015

$7,338 (−0.1%)

$311,745 + $315,235

$626,980

2014

$7,346 (+1.1%)

$301,049 + $304,418

$605,467

2012

$7,268 (+2.9%)

$261,000 + $264,000

$525,000

2011

$7,059 (+0.8%)

$293,813 + $297,101

$590,914

2010

$7,007 (+14.6%)

$288,052 + $291,276

$579,328

2009

$6,116 (+2.8%)

$285,900 + $289,100

$575,000

2008

$5,952

$304,725 + $195,420

$500,145

*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

0.3 Acres

Year renovated

1977

Sq. Ft.

2,037

Year built

1977

Style

Single Family Residential

County

Los Angeles County

APN

8714004009

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Aug 30, 2026.

Low Density Residential District

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

Permitted uses

Include but are not limited to:

Livestock production
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: 3
Direct Garage Access
Has Parking

Interior

Bathroom Information
# of Baths (Full): 2

Cooling Information
Central
Has Cooling

Room Information
Den, Family Room

Fireplace Information
Living Room
Has Fireplace

Interior Features
Levels: One

Exterior

Exterior Information
Has Fence

Exterior Features
Pool Features: None
Has Sprinklers

Lot Information
Lot Size Source: Assessor's Data
Lot Features: Sprinklers In Front, Sprinklers In Rear

Property Information
Living Area Source: Assessor's Data
Parcel Number: 8714004009

Location

Location Information
Latitude: 33.96825400
Longitude: -117.84064000

Public facts

Beds: 4
Baths: 2.0
Sq. Ft.: 2,037
Stories: —
Lot Size: 0.3 acres
Style: Single Family Residential
Year Built: 1977
Year Renovated: 1977
County: Los Angeles County
APN: 8714004009

Home facts updated by county records on Aug 30, 2026

Other

Listing Information
Days Active in MLS: 55
Continuous Days Active in MLS: 55

Listing Agent Information
List Agent First Name: Marina
List Agent Last Name: Andres

Listing Office Information
List Office Name: Royal Pacific MTG & Realty

Selling Agent Information
Buyer Agent First Name: Helene
Buyer Agent Last Name: Chen

Selling Office Information
Buyer Office Name: A + Realty & Mortgage

Around this home

Schools

Castle Rock Elementary School

Public K-5 • Assigned • 0.3mi

10/10

South Pointe Middle School

Public 6-8 • Assigned • 1.7mi

10/10

Diamond Bar High School

Public 9-12 • Assigned • 0.9mi

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

5% chance of being in a wildfire in next 30 years

5/10 Heat Factor

6 days above 98° expected this year, 18 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

$1.19M – $1.44M

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Home values near 21485 Cold Spring Ln

Data from public records.

Address	Redfin Estimate
21478 Cold Spring Lane, Diamond Bar, CA 3 Beds \| 3 Baths \| 2712 Sq. Ft.	$1,336,002
21472 Cold Spring Lane, Diamond Bar, CA 4 Beds \| - Baths \| 2712 Sq. Ft.	$1,478,600

Address	Redfin Estimate
21476 Cold Spring Lane, Diamond Bar, CA 3 Beds \| 3 Baths \| 2796 Sq. Ft.	$1,460,093
21494 Cold Spring Lane, Diamond Bar, CA 3 Beds \| 2 Baths \| 2037 Sq. Ft.	$1,198,405

Address	Redfin Estimate
21474 Cold Spring Lane, Diamond Bar, CA 4 Beds \| 2 Baths \| 2037 Sq. Ft.	$1,378,239
21492 Cold Spring Lane, Diamond Bar, CA 4 Beds \| 3 Baths \| 2378 Sq. Ft.	$1,391,560

Property information provided by CRMLS when last listed in 2009. This data may not match . Learn more.

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