21223 Fountain Spgs, Diamond Bar, CA 91765

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Off market nov 2025 for $900K

$1,002,463

Est. refi paymentEst. refi $6,214/mo

•

1,300

sq ft

21223 Fountain Spgs, Diamond Bar, CA 91765

About this home

Welcome to this smartly designed and efficient 3-bedroom, 2-bathroom home located in one of Diamond Bar’s most sought-after neighborhoods. Perfectly situated just steps from Diamond Bar High School, this 1,300 sq ft home sits on a generous 7,987 sq ft lot, offering the ideal blend of comfort, convenience, and outdoor enjoyment. Step inside to a warm and inviting family room featuring a cozy fireplace — perfect for relaxing evenings. The home also includes an upgraded electrical panel, giving you peace of mind and added value. Outdoors, enjoy the California lifestyle with your private swimming pool, perfect for entertaining or unwinding under the sun. With a prime location, a spacious layout, and key upgrades, this home is a rare opportunity in the heart of Diamond Bar. Don’t miss your chance to make it yours! Great location near freeways, shopping, schools and parks, come see today.

Single-familyProperty Type

1962Year Built

7,987 sq ftLot Size

$771Est. Price/Sq.Ft.

2 car garageParking

Listed by Mark Sapienza •DRE #01733198 • BERKSHIRE HATH HM SVCS CA PROP

Contact: 909-518-3234

Bought with Joshua McIntyre •DRE #01991751 • BERKSHIRE HATH HM SVCS CA PROP

Redfin checked: 2 minutes ago

•Source:CRMLS #CV25238010

Redfin Estimate

$1,002,463

$102K since sold in November 2025$45K since September

Recently sold homes
Estimate history
Homes for sale

This home's estimate is 7.1% higher than the average sale price ($936K) of 6 comparable homes.

SOLD SEP 17, 2026
$930,000
A
3 beds2 baths1,300 sq ft
2726 Castle Rock, Diamond Bar, CA 91765
SOLD JUL 31, 2026
$875,000
B
3 beds2 baths1,300 sq ft
21245 Cold Spg, Diamond Bar, CA 91765
SOLD JUL 31, 2026
$975,000
C
3 beds2 baths1,300 sq ft
2606 Castle Rock Rd, Diamond Bar, CA 91765
Synergy Real Estate
SOLD JUL 16, 2026
$958,600
D
3 beds2 baths1,372 sq ft
2127 Evergreen Springs Dr, Diamond Bar, CA 91765
Keller Williams Premier Prop
SOLD FEB 26, 2026
$880,000
E
3 beds2 baths1,280 sq ft
2632 Castle Rock, Diamond Bar, CA 91765
SOLD DEC 5, 2025
$999,999
F
3 beds2 baths1,300 sq ft
2968 Crooked Creek Dr, Diamond Bar, CA 91765

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Earn from this home

Sell

$239,068

Est. take-home

List your home with Redfin and save $5,012

Refinance

Est. cash available

Get cash now or lower your monthly rate

Rent

$3,249/mo

Redfin rental estimate

List your home for rent

Market trends in 91765, CA

Last updated September 2026

Buyer's Market

Seller's Market

Balanced 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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$1,170,000
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FOR SALE BY OWNER
$1,200,000
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512 Armitos Pl, Diamond Bar, CA 91765
COMING SOON
$899,000
3 beds2 baths1,274 sq ft
22922 Dry Crk, Diamond Bar, CA 91765
OPEN SAT, 2PM TO 5PM
$1,499,900
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24215 Delta Dr, Diamond Bar, CA 91765
$468,000
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22871 Hilton Head Dr #230, Diamond Bar, CA 91765
$1,363,000
4 beds5 baths2,430 sq ft
883 Terrace W, Pomona, CA 91765
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See all

Provided by Redfin

Sale history for 21223 Fountain Spgs

Year

Property tax

Land + Additions

Assessment*

2025

$4,225 (+6.9%)

$674,900 + $225,100

$900,000

2024

$3,952 (+2.3%)

$166,322 + $134,655

$300,977

2023

$3,861 (+2.2%)

$163,061 + $132,015

$295,076

2022

$3,779 (+2.0%)

$159,864 + $129,427

$289,291

2021

$3,704 (+1.3%)

$156,730 + $126,890

$283,620

2020

$3,659 (+1.9%)

$153,657 + $124,402

$278,059

2019

$3,590 (+5.2%)

$152,082 + $123,127

$275,209

2018

$3,413 (+4.6%)

$149,100 + $120,713

$269,813

2017

$3,262 (+3.1%)

$143,311 + $116,027

$259,338

2016

$3,163 (−0.5%)

$143,311 + $116,027

$259,338

2015

$3,178 (−0.2%)

$140,501 + $113,752

$254,253

2014

$3,185 (+1.4%)

$135,681 + $109,850

$245,531

2012

$3,141 (+3.0%)

$135,068 + $109,354

$244,422

2011

$3,051 (+0.9%)

$132,420 + $107,210

$239,630

2010

$3,024 (+0.6%)

$129,824 + $105,108

$234,932

2009

$3,006 (+3.0%)

$128,854 + $104,323

$233,177

2008

$2,918

$129,161 + $104,571

$233,732

Tax history for 21223 Fountain Spgs

Year

Property tax

Land + Additions

Assessment*

2025

$4,225 (+6.9%)

$674,900 + $225,100

$900,000

2024

$3,952 (+2.3%)

$166,322 + $134,655

$300,977

2023

$3,861 (+2.2%)

$163,061 + $132,015

$295,076

2022

$3,779 (+2.0%)

$159,864 + $129,427

$289,291

2021

$3,704 (+1.3%)

$156,730 + $126,890

$283,620

2020

$3,659 (+1.9%)

$153,657 + $124,402

$278,059

2019

$3,590 (+5.2%)

$152,082 + $123,127

$275,209

2018

$3,413 (+4.6%)

$149,100 + $120,713

$269,813

2017

$3,262 (+3.1%)

$143,311 + $116,027

$259,338

2016

$3,163 (−0.5%)

$143,311 + $116,027

$259,338

2015

$3,178 (−0.2%)

$140,501 + $113,752

$254,253

2014

$3,185 (+1.4%)

$135,681 + $109,850

$245,531

2012

$3,141 (+3.0%)

$135,068 + $109,354

$244,422

2011

$3,051 (+0.9%)

$132,420 + $107,210

$239,630

2010

$3,024 (+0.6%)

$129,824 + $105,108

$234,932

2009

$3,006 (+3.0%)

$128,854 + $104,323

$233,177

2008

$2,918

$129,161 + $104,571

$233,732

*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

7,987 Sq. Ft.

Year renovated

1963

Sq. Ft.

1,300

Year built

1962

Style

Single Family Residential

County

Los Angeles County

APN

8285002021

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Oct 6, 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
# of Parking Spaces: 2

Interior

Laundry Information
Has Laundry
Individual Room

Kitchen Information
Appliances: Garbage Disposal
Has Appliances
Breakfast Counter / Bar
Tile Counters

Bathroom Information
# of Baths (Full): 2
Walk-in shower

Cooling Information
Central
Has Cooling

Room Information
All Bedrooms Down

Fireplace Information
Family Room
Has Fireplace

Flooring Information
Carpet, Tile

Heating Information
Central Furnace
Has Heating

Interior Features
Entry Level: 1
Entry Location: 1
Block Walls
Levels: One
Main Level Bathrooms: 2
Main Level Bedrooms: 3

Exterior

Exterior Information
Structure Type: House
Roof: Shingle

Exterior Features
Patio And Porch Features: Concrete, Covered
Has Patio
Pool Features: Private
Has Pool

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

Property Information
Total # of Units: 1
Accessibility Features: None
Common Walls: No Common Walls
Living Area Source: Assessor's Data
Parcel Number: 8285002021
Total # of Stories: 1
Has View
Year Built Source: Assessor
Property ADU: No

Financial

Assesments Information
Assessments: Unknown

Utilities

Utilities Information
Electric: Standard
Sewer: Sewer or Septic - Unknown
Cable Available, Electricity Available, Natural Gas Available, Sewer Connected, Water Available
Water Source: District/Public

Location

Neighborhood Information
Community Features: Suburban

School Information
High School District: Walnut Valley Unified

Location Information
Latitude: 33.97912500
Longitude: -117.84004200
Directions: Diamond Bar Blvd to Fountain Springs RD

Public facts

Beds: 3
Baths: 2.0
Sq. Ft.: 1,300
Stories: —
Lot Size: 7,987 square feet
Style: Single Family Residential
Year Built: 1962
Year Renovated: 1963
County: Los Angeles County
APN: 8285002021

Home facts updated by county records on Oct 6, 2026

Other

Listing Information
IDX Contact Info: 909-518-3234
Days Active in MLS: 3
Continuous Days Active in MLS: 3

Listing Agent Information
List Agent First Name: Mark
List Agent Last Name: Sapienza

Listing Office Information
List Office Name: BERKSHIRE HATH HM SVCS CA PROP

Selling Agent Information
Buyer Agent First Name: Joshua
Buyer Agent Last Name: McIntyre

Selling Office Information
Buyer Office Name: BERKSHIRE HATH HM SVCS CA PROP

Around this home

Schools

Evergreen Elementary School

Public K-5 • Assigned • 0.3mi

9/10

Chaparral Middle School

Public 6-8 • Assigned • 1.7mi

10/10

Diamond Bar High School

Public 9-12 • Assigned • 0.2mi

10/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Climate risks

1/10 Flood Factor

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

5/10 Fire Factor

3% 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

$953,000 – $1.15M

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Home values near 21223 Fountain Spgs

Data from public records.

Address	Redfin Estimate
21237 Fountain Springs Rd, Diamond Bar, CA 3 Beds \| 2 Baths \| 1300 Sq. Ft.	$857,294
21209 Fountain Springs Rd, Diamond Bar, CA 3 Beds \| 2 Baths \| 1280 Sq. Ft.	$848,922

Address	Redfin Estimate
21231 Fountain Springs Rd, Diamond Bar, CA 4 Beds \| 2 Baths \| 1576 Sq. Ft.	$1,052,359
21307 Fountain Springs Rd, Diamond Bar, CA 3 Beds \| 2 Baths \| 1760 Sq. Ft.	$1,108,318

Address	Redfin Estimate
21217 Fountain Springs Rd, Diamond Bar, CA 4 Beds \| 2 Baths \| 1475 Sq. Ft.	$893,270
21204 Fountain Springs Rd, Diamond Bar, CA 3 Beds \| 2 Baths \| 1300 Sq. Ft.	$941,680

Property information provided by CRMLS when last listed in 2025. 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 21223 Fountain Spgs

Tax history for 21223 Fountain Spgs

Public record

Property details

Around this home

Schools

Lifestyle

Climate risks

Historical weather

Sun exposure

Nearby similar homes

New listings for sale in 91765

Home values near 21223 Fountain Spgs

More real estate resources