21504 Cold Spring Ln, Diamond Bar, CA 91765

Sold on sep 2026

$1,380,000

•

2,712

sq ft

21504 Cold Spring Ln, Diamond Bar, CA 91765

Track this home’s value and nearby sales activity

About this home

PAID OFF Solar System with 32 Panasonic Panels. Two Tesla EV charging stations, 2025 AO Smith electric water heater, a whole-house water softener system, newer roof, and newer A/C. Enjoy beautiful mountain views by day and sparkling city lights by night from this lovely home nestled in the desirable hills of Diamond Bar, complete with a private pool perfect for relaxing or entertaining. The bright and airy layout features soaring high ceilings in the living room, abundant natural light, a desirable downstairs bedroom, and a spacious 3-car garage. Located within the award-winning Walnut Valley Unified School District with top-rated 10/10 schools, and just minutes from Diamond Hills Plaza featuring H Mart, popular dining, shopping, and everyday conveniences. NO HOA.

Single-familyProperty Type

1977Year Built

0.33 acresLot Size

$509Price/Sq.Ft.

3 car garageParking

Listed by ALLEN SHI •DRE #02045433 • Wetrust Realty

Contact: 626-202-8703

Bought with YAMING WU •DRE #02167052 • First Team Real Estate

Redfin checked: 4 minutes ago

•Source:CRMLS #WS26113219

Redfin Estimate

$1,458,332

$78K since sold in September 2026$41K since September

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 4% higher than the average sale price ($1.40M) of 6 comparable homes.

SOLD MAY 28, 2026
$1,505,000
A
4 beds3 baths2,712 sq ft
3249 Hawkwood Rd, Diamond Bar, CA 91765
SOLD SEP 4, 2026
$1,265,000
B
4 beds2.5 baths2,640 sq ft
3106 Cherrydale, Diamond Bar, CA 91765
New Star Realty & Inv.
SOLD MAY 12, 2026
$1,680,000
C
4 beds3 baths2,697 sq ft
21535 Chirping Sparrow, Diamond Bar, CA 91765
BOUGHT WITH REDFIN SEP 14, 2026
$1,360,000
D
4 beds3 baths2,404 sq ft
20111 Evening Breeze Dr, Walnut, CA 91789
SOLD OCT 6, 2026
$1,275,000
E
4 beds3 baths3,019 sq ft
3581 Hawkwood, Diamond Bar, CA 91765
The Agency
SOLD MAY 14, 2026
$1,330,000
F
4 beds3 baths2,037 sq ft
3357 Bent Twig, Diamond Bar, CA 91765

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Market trends in 91765, CA

Last updated September 2026

Buyer's Market

Seller's Market

Balanced market

Sale-to-list price

97.8%

0.8% MoM

Median sale price

$1.1M

$12K MoM

Avg. days on market

61d

18 days MoM

Recently sold homes

3 MoM

New listings for sale

OPEN SAT, 1PM TO 4PM
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OPEN SAT, 1PM TO 4PM
$1,099,900
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305 N Prospectors Rd, Diamond Bar, CA 91765
$370,000
1 bed1 bath827 sq ft
356 S Prospectors #83, Diamond Bar, CA 91765
$948,888
3 beds3 baths2,082 sq ft
24127 Willow Crk, Diamond Bar, CA 91765
OPEN SAT, 12PM TO 3PM
$878,000
4 beds2 baths1,540 sq ft
23718 Meadow Fls, Diamond Bar, CA 91765
COMING SOON
$1,450,000
3 beds3.5 baths2,716 sq ft
23843 Gold Rush Dr, Diamond Bar, CA 91765
$849,900
3 beds2 baths1,553 sq ft
22709 Dry Creek Rd, Diamond Bar, CA 91765
$949,888
3 beds2 baths1,535 sq ft
1936 Ano Nuevo, Diamond Bar, CA 91765
$750,000
4 beds3 baths1,619 sq ft
2119 Dublin Ln #2, Diamond Bar, CA 91765
$399,000
2 beds1 bath850 sq ft
22801 Hilton Head Dr #17, Diamond Bar, CA 91765
See all

Provided by Redfin

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Rental estimate

Est. $4,033 per month, based on comparable rentals

Sale and tax history for 21504 Cold Spring Ln

Sale History
Tax History

Date

Event

Price

CRMLS #WS26113219

Sep 28, 2026

Sold

$1,380,000

$509/sq ft

Sep 10, 2026

Pending

—

Aug 25, 2026

Contingent

—

Aug 20, 2026

Price Changed

$1,460,000

$538/sq ft

Jul 29, 2026

Price Changed

$1,540,000

$568/sq ft

May 30, 2026

Listed

$1,580,000

$583/sq ft

CRMLS #C11114133

Jan 20, 2012

Sold

$700,000

$258/sq ft

Dec 9, 2011

Pending

—

Sep 9, 2011

Price Changed

$738,888

$272/sq ft

Aug 29, 2011

Listed

$748,888

$276/sq ft

WOW!!! GORGEOUS ESTATE SITUATED IN A SECLUDED HILLSIDE OF DIAMOND RIDGE VILLAGE IN SOUTH DIAMOND BAR. FEATURING SPECTACULAR PANORAMIC VIEW AND RESORT-LIKE PARADISE BACK YARD WITH POOL & SPA. THE MAGNIFICENT DOUBLE DOOR ENTRY GREETS YOU INTO A LARGE ENTRY, AN OPEN FLOOR PLAN & A GRAND ROUNDED STAIRCASE. MAIN FLOOR FEATURES A SPACIOUS LIVING ROOM WITH HIGH CEILINGS & FORMAL DINING ROOM, FAMILY ROOM WITH FIREPLACE, BREAKFAST NOOK & BEAUTIFUL KITCHEN WITH GRANITE COUNTER TOP & WALK-IN PANTRY. ALSO, A BEDROOM DOWNSTAIRS WITH DOUBLE DOOR ENTRY, A FULL BATH & LAUNDRY ROOM. * * * NEW ROOF, NEW FRONT DOOR & NEW TILE FLOOR * * * SECOND FLOOR FEATURES A GRAND MASTER SUITE WITH RETREAT & BALCONY WITH A SPECTACULAR VIEW! MASTER BATH HAS BEEN REMODELED WITH NEW TILE FLOORS, NEW CABINETS, SINK AND NEW LUXURIOUS JACUZZI TUB. ALSO, JACK & JILL BEDROOMS & FULL BATH. THE IMPRESSIVE VIEW OF THE HILLS AND CITY LIGHTS CAN BE ENJOYED FROM THE BACK YARD, KITCHEN, BREAKFAST NOOK, FAMILY ROOM, DINING ROOM, MASTER SUITE BATH & BALCONY. THE BACK YARD IS A TRUE PARADISE WITH STUNNING VIEW, SPARKLING POOL & SPA AND COVERED PATIO. YOU NEED TO SEE TO APPRECIATE! YOU WILL NOT BE DISAPPOINTED!

Public Records

Sep 26, 1995

Sold

$294,500

$109/sq ft

Public Records

Jul 19, 1991

Sold

$350,000

$129/sq ft

Public Records

Nov 16, 1988

Sold

$377,000

$139/sq ft

Year

Property tax

Land + Additions

Assessment*

2025

$11,512 (+5.6%)

$439,950 + $461,428

$901,378

2024

$10,906 (+2.9%)

$431,324 + $452,386

$883,710

2023

$10,599 (+2.6%)

$422,867 + $443,516

$866,383

2022

$10,333 (+1.9%)

$414,576 + $434,820

$849,396

2021

$10,140 (+1.3%)

$406,448 + $426,295

$832,743

2020

$10,012 (+1.9%)

$398,479 + $417,937

$816,416

2019

$9,822 (+4.4%)

$394,394 + $413,652

$808,046

2018

$9,412 (+4.8%)

$386,661 + $405,542

$792,203

2017

$8,982 (+3.1%)

$371,648 + $389,796

$761,444

2016

$8,715 (−0.6%)

$371,648 + $389,796

$761,444

2015

$8,769 (−0.1%)

$364,361 + $382,153

$746,514

2014

$8,779 (+76.6%)

$351,858 + $369,040

$720,898

2012

$4,972 (+3.0%)

$350,268 + $367,373

$717,641

2011

$4,829 (+0.8%)

$124,846 + $264,651

$389,497

2010

$4,791 (+0.4%)

$122,399 + $259,462

$381,861

2009

$4,771 (+2.8%)

$121,485 + $257,523

$379,008

2008

$4,641

$121,774 + $258,135

$379,909

Public record

Public record
Zoning

Beds

Baths

Stories

—

Lot width

—

Lot depth

—

Lot size

0.33 Acres

Year renovated

1977

Sq. Ft.

2,712

Year built

1977

Style

Single Family Residential

County

Los Angeles County

APN

8714002003

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Oct 7, 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
# of Parking Spaces: 3

Interior

Laundry Information
Has Laundry
Gas Dryer Hookup, Individual Room, Washer Hookup

Bathroom Information
# of Baths (Full): 3

Cooling Information
Central
Has Cooling

Room Information
Jack & Jill, Walk-In Closet, Primary Bedroom, Walk-In Pantry, Laundry, Foyer, Kitchen, Living Room, Main Floor Bedroom, Family Room, Primary Bathroom

Fireplace Information
Family Room
Has Fireplace

Heating Information
Central Furnace
Has Heating

Interior Features
Entry Level: 1
Entry Location: 1
Levels: Two
Main Level Bathrooms: 1
Main Level Bedrooms: 1

Exterior

Exterior Information
Structure Type: House

Exterior Features
Pool Features: In Ground, Private
Has Pool

Lot Information
Elevation Units: Feet
Lot Size Source: Assessor's Data
Lot Features: Front Yard, Back Yard

Property Information
Total # of Units: 1
Common Walls: No Common Walls
Living Area Source: Assessor's Data
Parcel Number: 8714002003
Total # of Stories: 2
Has View
Year Built Source: Public Records
Property ADU: No

Financial

Assesments Information
Assessments: Special Assessments

Utilities

Utilities Information
Sewer: Public Sewer
Water Source: District/Public

Location

Neighborhood Information
Community Features: Sidewalks

School Information
Elementary School: Castle Rock
Middle Or Junior School: South Pointe
High School: Diamond Bar
High School District: Walnut Valley Unified
Elementary School 2: CASROC
Middle Or Junior School 2: SOUPOI
High School 2: DIABAR

Location Information
Latitude: 33.96675600
Longitude: -117.84107200
Directions: Diamond bar blvd and cold spring lane

Public facts

Beds: 3
Baths: 3.0
Sq. Ft.: 2,712
Stories: —
Lot Size: 0.33 acres
Style: Single Family Residential
Year Built: 1977
Year Renovated: 1977
County: Los Angeles County
APN: 8714002003

Home facts updated by county records on Oct 7, 2026

Other

Listing Information
IDX Contact Info: 626-202-8703
Days Active in MLS: 87
Continuous Days Active in MLS: 87

Listing Agent Information
List Agent First Name: ALLEN
List Agent Last Name: SHI

Listing Office Information
List Office Name: Wetrust Realty

Selling Agent Information
Buyer Agent First Name: YAMING
Buyer Agent Last Name: WU

Selling Office Information
Buyer Office Name: First Team Real Estate

Around this home

Schools

Castle Rock Elementary School

Public K-5 • Assigned • 0.4mi

10/10

South Pointe Middle School

Public 6-8 • Assigned • 1.8mi

10/10

Diamond Bar High School

Public 9-12 • Assigned • 1.0mi

10/10

Provided by GreatSchools

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, 17 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

81/ 100

Very good sunlight

Sunscore

This home receives average direct sun exposure in Diamond Bar. There appears to be minimal shading by surrounding buildings, terrain, and vegetation.

8.8 hrs

5.5 hrs

JuneDecember

Provided by Shadowmap

Estimated sale price

$1.39M – $1.68M

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New listings for sale in 91765

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22709 Dry Creek Rd, Diamond Bar, CA 91765

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1936 Ano Nuevo, Diamond Bar, CA 91765

Corner lot • Living room • Cozy fireplace

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2119 Dublin Ln #2, Diamond Bar, CA 91765

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Home values near 21504 Cold Spring Ln

Data from public records.

Address	Redfin Estimate
21502 Cold Spring Lane, Diamond Bar, CA 3 Beds \| 3 Baths \| 2321 Sq. Ft.	$1,281,300
21494 Cold Spring Lane, Diamond Bar, CA 3 Beds \| 2 Baths \| 2037 Sq. Ft.	$1,194,419

Address	Redfin Estimate
21498 Cold Spring Lane, Diamond Bar, CA 5 Beds \| 3 Baths \| 2796 Sq. Ft.	$1,390,917
21492 Cold Spring Lane, Diamond Bar, CA 4 Beds \| 3 Baths \| 2378 Sq. Ft.	$1,391,875

Address	Redfin Estimate
21496 Cold Spring Lane, Diamond Bar, CA 4 Beds \| 3 Baths \| 2712 Sq. Ft.	$1,618,348
21490 Cold Spring Lane, Diamond Bar, CA 4 Beds \| - Baths \| 2712 Sq. Ft.	$1,437,168

Property information provided by CRMLS when last listed in 2026. This data may not match . Learn more.

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GreatSchools Ratings provided by GreatSchools.org.

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21504 Cold Spring Ln, Diamond Bar, CA 91765

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About this home

Redfin Estimate

Market trends in 91765, CA

Homeowner tools

Sale and tax history for 21504 Cold Spring Ln

Public record

Property details

Parking

Interior

Exterior

Financial

Utilities

Location

Public facts

Other

Around this home

Schools

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 91765

Home values near 21504 Cold Spring Ln

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