21509 Running Branch Rd, Diamond Bar, CA 91765

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Off Market Aug 2014 for $890K

$1,428,141

Est. refi paymentEst. refi $5,769/mo

•

2,695

sq ft

21509 Running Branch Rd, Diamond Bar, CA 91765

About this home

Get the best of both worlds! This house is located in between busy lifestyle of Downtown and relaxing beach getaway. Serene home with plenty of upgrades from floorings to countertops and bathrooms, and a charming private backyard for those lazy afternoon teas on the patio or s’more roasting night with a dip in the jacuzzi. This house boasts a magnificent view directly from the master suite balcony! This house is also walking distance to the most sought out Walnut District schools. This is a true hidden gem in Diamond Bar, you wouldn’t want to miss the opportunity to see this beauty!

Single-familyProperty Type

1979Year Built

7,836 sq ftLot Size

$530Est. Price/Sq.Ft.

3 car garageParking

Listed by Jenny Wu •DRE #01817291 • ReMax 2000 Realty

Listed by Kevin Wang •DRE #01873617 • ReMax 2000 Realty

Bought with Anne Ku •DRE #01780804 • Redfin Corporation

Redfin checked: a minute ago

•Source:CRMLS #TR14073552

Redfin Estimate

$1,428,141

$538K since sold in August 2014$5,000 since August

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 0% lower than the average sale price ($1.43M) of 5 comparable homes.

SOLD APR 15, 2026
$1,379,000
A
4 beds3 baths2,697 sq ft
3424 Hawkwood Rd, Diamond Bar, CA 91765
Vimvi California
SOLD MAY 12, 2026
$1,680,000
B
4 beds3 baths2,697 sq ft
21535 Chirping Sparrow, Diamond Bar, CA 91765
SOLD MAY 28, 2026
$1,505,000
C
4 beds3 baths2,712 sq ft
3249 Hawkwood Rd, Diamond Bar, CA 91765
SOLD MAR 25, 2026
$1,250,000
D
4 beds3 baths2,380 sq ft
3396 Hawkwood, Diamond Bar, CA 91765
SOLD MAY 14, 2026
$1,330,000
E
4 beds3 baths2,037 sq ft
3357 Bent Twig, Diamond Bar, CA 91765

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Earn from this home

Sell

$829,696

Est. take-home

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Refinance

Est. cash available

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Rent

$4,110/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

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First Team Real Estate
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2828 Water Course Dr, Diamond Bar, CA 91765
OPEN SUN, 1PM TO 3PM
$1,199,999
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23308 Quail Smt, Diamond Bar, CA 91765
$818,800
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22935 Estoril Dr #6, Diamond Bar, CA 91765
OPEN SUN, 1AM TO 3PM
$1,690,000
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1515 Sunbluff Dr, Diamond Bar, CA 91765
OPEN SUN, 1PM TO 4PM
$538,000
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800 Grand Ave Unit D1, Diamond Bar, CA 91765
$1,070,000
4 beds2.5 baths1,893 sq ft
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OPEN SUN, 1PM TO 4PM
$1,150,000
4 beds3 baths1,747 sq ft
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See all

Provided by Redfin

Sale history for 21509 Running Branch Rd

Date

Event

Price

CRMLS #TR14073552

Aug 20, 2014

Sold

$890,000

$330/sq ft

May 14, 2014

Price Changed

$899,000

$334/sq ft

May 14, 2014

Pending

—

May 14, 2014

Price Changed

$899,900

$334/sq ft

May 14, 2014

Pending

—

May 1, 2014

Price Changed

$948,000

$352/sq ft

Apr 10, 2014

Listed

$899,900

$334/sq ft

CRMLS #H611310

Dec 1, 2006

Listing Removed

—

Aug 14, 2006

Listed

$788,800

$293/sq ft

CRMLS #H610952

Sep 19, 2006

Listing Removed

—

Aug 7, 2006

Listed

$788,800

$293/sq ft

CRMLS #H608326

Sep 19, 2006

Listing Removed

—

Jun 20, 2006

Listed

$818,000

$304/sq ft

Public Records

Jun 14, 1996

Sold

$270,000

$100/sq ft

Public Records

Apr 18, 1980

Sold

$154,000

$57/sq ft

Year

Property tax

Land + Additions

Assessment*

2025

$13,494 (+4.9%)

$515,347 + $554,287

$1,069,634

2024

$12,866 (+2.5%)

$515,347 + $554,287

$1,069,634

2023

$12,557 (+2.1%)

$505,243 + $543,419

$1,048,662

2022

$12,298 (+1.9%)

$495,337 + $532,764

$1,028,101

2021

$12,071 (+1.3%)

$485,625 + $522,318

$1,007,943

2020

$11,917 (+2.0%)

$476,103 + $512,077

$988,180

2019

$11,688 (+4.1%)

$471,222 + $506,827

$978,049

2018

$11,230 (+4.8%)

$461,983 + $496,890

$958,873

2017

$10,712 (+3.0%)

$444,045 + $477,597

$921,642

2016

$10,399 (−0.6%)

$444,045 + $477,597

$921,642

2015

$10,465 (+122.8%)

$435,339 + $468,233

$903,572

2014

$4,696 (+3.0%)

$109,899 + $255,988

$365,887

2012

$4,560 (+3.0%)

$109,403 + $254,832

$364,235

2011

$4,428 (+0.8%)

$107,258 + $249,836

$357,094

2010

$4,392 (+0.5%)

$105,155 + $244,938

$350,093

2009

$4,372 (+2.8%)

$104,370 + $243,108

$347,478

2008

$4,251

$104,618 + $243,686

$348,304

Tax history for 21509 Running Branch Rd

Year

Property tax

Land + Additions

Assessment*

2025

$13,494 (+4.9%)

$515,347 + $554,287

$1,069,634

2024

$12,866 (+2.5%)

$515,347 + $554,287

$1,069,634

2023

$12,557 (+2.1%)

$505,243 + $543,419

$1,048,662

2022

$12,298 (+1.9%)

$495,337 + $532,764

$1,028,101

2021

$12,071 (+1.3%)

$485,625 + $522,318

$1,007,943

2020

$11,917 (+2.0%)

$476,103 + $512,077

$988,180

2019

$11,688 (+4.1%)

$471,222 + $506,827

$978,049

2018

$11,230 (+4.8%)

$461,983 + $496,890

$958,873

2017

$10,712 (+3.0%)

$444,045 + $477,597

$921,642

2016

$10,399 (−0.6%)

$444,045 + $477,597

$921,642

2015

$10,465 (+122.8%)

$435,339 + $468,233

$903,572

2014

$4,696 (+3.0%)

$109,899 + $255,988

$365,887

2012

$4,560 (+3.0%)

$109,403 + $254,832

$364,235

2011

$4,428 (+0.8%)

$107,258 + $249,836

$357,094

2010

$4,392 (+0.5%)

$105,155 + $244,938

$350,093

2009

$4,372 (+2.8%)

$104,370 + $243,108

$347,478

2008

$4,251

$104,618 + $243,686

$348,304

*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

7,838 Sq. Ft.

Year renovated

1979

Sq. Ft.

2,695

Year built

1979

Style

Single Family Residential

County

Los Angeles County

APN

8714010024

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
# of Garage Spaces: 3
# of Parking Spaces: 3

Interior

Kitchen Information
Breakfast Counter / Bar, Breakfast Nook, Formal Dining Room

Bathroom Information
# of Baths (Full): 3

Cooling Information
Central
Has Cooling

Room Information
Dressing Area, Entry, Family Room, Jack & Jill, Living Room, Primary Bedroom, Primary Suite, Walk-In Pantry, Office

Fireplace Information
Family Room
Has Fireplace

Interior Features
Balcony, High Ceilings (9 Feet+)
Levels: Two
Spa Features: In Ground
Has Spa

Exterior

Exterior Features
Pool Features: None

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

Property Information
Total # of Units: 1
Common Walls: No Common Walls
Living Area Source: Assessor's Data
Parcel Number: 8714010024
Has View
Year Built Source: Assessor

Financial

Assesments Information
Assessments: Unknown

Utilities

Utilities Information
Sewer: Sewer or Septic - Unknown
Water Source: District/Public

Location

Multi-Unit Information
# of Units In Community: 1

Neighborhood Information
Community Features: Curbs, Sidewalks, Street Lighting, Storm Drains

School Information
High School District: Walnut Valley Unified

Location Information
Latitude: 33.96512200
Longitude: -117.83989000

Public facts

Beds: 4
Baths: 3.0
Sq. Ft.: 2,695
Stories: —
Lot Size: 7,838 square feet
Style: Single Family Residential
Year Built: 1979
Year Renovated: 1979
County: Los Angeles County
APN: 8714010024

Home facts updated by county records on Aug 30, 2026

Other

Listing Information
Days Active in MLS: 58
Continuous Days Active in MLS: 125

Listing Agent Information
List Agent First Name: Jenny
List Agent Last Name: Wu
Co-List Agent First Name: Kevin
Co-List Agent Last Name: Wang

Listing Office Information
List Office Name: ReMax 2000 Realty
Co-List Office Name: ReMax 2000 Realty

Selling Agent Information
Buyer Agent First Name: Anne
Buyer Agent Last Name: Ku

Selling Office Information
Buyer Office Name: Redfin Corporation

Around this home

Schools

Castle Rock Elementary School

Public K-5 • Assigned • 0.5mi

10/10

South Pointe Middle School

Public 6-8 • Assigned • 1.9mi

10/10

Diamond Bar High School

Public 9-12 • Assigned • 1.1mi

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

6% chance of being in a wildfire in next 30 years

5/10 Heat Factor

5 days above 98° expected this year, 15 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

$1.36M – $1.64M

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Home values near 21509 Running Branch Rd

Data from public records.

Address	Redfin Estimate
21577 Running Branch Road, Diamond Bar, CA 4 Beds \| 3 Baths \| 2695 Sq. Ft.	$1,396,801
21521 Running Branch Road, Diamond Bar, CA 3 Beds \| 2 Baths \| 1752 Sq. Ft.	$1,069,921

Address	Redfin Estimate
21555 Running Branch Road, Diamond Bar, CA 3 Beds \| 3 Baths \| 2380 Sq. Ft.	$1,240,236
21485 Running Branch Road, Diamond Bar, CA 4 Beds \| 3 Baths \| 2798 Sq. Ft.	$1,207,668

Address	Redfin Estimate
21543 Running Branch Road, Diamond Bar, CA 4 Beds \| 3 Baths \| 2697 Sq. Ft.	$1,365,806
21475 Running Branch Road, Diamond Bar, CA 4 Beds \| - Baths \| 2695 Sq. Ft.	$1,485,599

Property information provided by CRMLS when last listed in 2014. This data may not match . Learn more.

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