Listed by Julie Cheng •DRE #02014396 • Universal Elite Inc.

Contact: julielynncheng@gmail.com

For sale

$3,070,000

Est. $20,502/mo —

•

7,884

sq ft

23240 Ridge Line, Diamond Bar, CA 91765

About this home

Highly motivated seller ready to make a quick sale-bring your serios offers today! Located within Diamond Bar’s prestigious guard-gated community of "The Country, " this magnificent custom estate offers an extraordinary blend of luxury, scale, and breathtaking mountain views. Spanning an expansive '7,884 sq. ft. "' of living space, the residence features "6 bedrooms and 8 bathrooms", along with a convenient elevator servicing all 4 levels plus an upper loft. Designed for grand entertaining and modern living, the home highlights " a rare indoor basketball court with high ceilings"—easily adaptable into a grand game room, home theater, or entertainment hall. Step outside to your private resort-style oasis complete with " an infinity pool "overlooking stunning canyon and mountain vistas. Zoned for the highly acclaimed Walnut Valley Unified School District, this exceptional property delivers ultimate privacy and prestige. Exceptional value and priced for a quick sale.

Single-familyProperty Type

1987Year Built

1.1 acresLot Size

$389Price/Sq.Ft.

$264/moHOA Dues

3 car garageParking

Listing updated: Oct 23, 2026 at 08:01am

Redfin checked: a few seconds ago

•Source:CRMLS #TR26225673

Payment calculator

$20,502 per month

Principal and interest$16,323

Property taxes

HOA dues

Home insurance

Utilities

5 minutes to get started. No credit impact.

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See this home in person

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Next available date: Wednesday, November 11

Open houses

No upcoming open houses.

Nearby open houses (10)

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1135 Loxley Pl, Walnut, CA 91789
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OPEN SAT, 12PM TO 2PM
$799,000
3 beds2 baths1,282 sq ft
3228 La Puente Rd, West Covina, CA 91792
8,461 sq ft lot • 2 garage spots • Built 1964
KELLER WILLIAMS REALTY COLLEGE PARK
OPEN SAT, 12PM TO 3PM
$499,000
1 bed1 bath881 sq ft
1631 S Pomona Unit D26, Fullerton, CA 92832
$443 HOA • Garage • Community pool
OPEN SAT, 12PM TO 2PM
$149,999
3 beds2 baths1,040 sq ft
201 E Arrow Hwy #21, Glendora, CA 91740
2 parking spots • Community pool • Built 2004
OPEN SAT, 12PM TO 3PM3D WALKTHROUGH
$3,200,000
5 beds4 baths5,500 sq ft
5321 Mountain View Ave, Yorba Linda, CA 92886
0.76 acre lot • 3 garage spots • Pool
Coldwell Banker Realty
OPEN SAT, 12PM TO 3PM
$1,299,999
4 beds2 baths1,570 sq ft
1807 Canard Ave, Placentia, CA 92870
7,140 sq ft lot • 2 garage spots • Built 1963
REDFIN OPEN SAT, 1PM TO 4PM3D WALKTHROUGH
$640,000
3 beds2.5 baths1,660 sq ft
15980 Aventurine Ln, Chino, CA 91708
$456 HOA • 2 garage spots • Pool
OPEN SAT, 1PM TO 4PM3D WALKTHROUGH
$899,888
4 beds2 baths1,512 sq ft
18499 La Guardia, Rowland Heights, CA 91748
9,561 sq ft lot • 2 garage spots • Built 1960
REDFIN OPEN SUN, 12PM TO 3PM3D WALKTHROUGH
$850,000
3 beds2 baths1,442 sq ft
2020 Baja Ave, La Habra, CA 90631
6,039 sq ft lot • 2 garage spots • Built 1958

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Around this home

Schools

K - 12
Preschool & daycare

Evergreen Elementary School

Public K-5 • Assigned • 1.3mi

9/10

Chaparral Middle School

Public 6-8 • Assigned • 0.6mi

10/10

Diamond Bar High School

Public 9-12 • Assigned • 1.6mi

10/10

Provided by GreatSchools

Lifestyle

Provided by Walk Score and Local Logic

Offer insights

23240 Ridge Line · $3,070,000

Strong offer

$3.1M and above

75% chance or better to win

Why $3.1M+ is a strong offer

DAYS ON MARKET

The average home goes pending in 48 days.

SALE-TO-LIST

Most homes are selling 1% below list price.

About offer insights

Property details

Interior
Exterior
Finance

Kitchen

Bathroom

Bedroom

Living

Interior features
Fireplaces in the bonus room, living room, and family room

Bedrooms
4 bedrooms on the main level

Bathrooms
8 full bathrooms
5 bathrooms on the main level

Laundry & utility
Inside laundry room

Heating & cooling
Central furnace
Dual central cooling

Sale and tax history for 23240 Ridge Line

Sale History
Tax History

Date

Event

Price

CRMLS #TR26225673

Oct 18, 2026

Listed

$3,070,000

$389/sq ft

CRMLS #TR21136588

Apr 1, 2022

Sold

$2,400,000

$304/sq ft

Mar 18, 2022

Pending

—

Feb 24, 2022

Contingent

—

Sep 23, 2021

Relisted

—

Sep 10, 2021

Contingent

—

Jul 1, 2021

Listed

$2,580,000

$327/sq ft

Located in Diamond Bar's prestigious community “The Country”, this luxurious 7,884 sq. ft. custom built estate is situated on a 47,729 sq. ft. lot and offers 6 exquisite bedroom suites, 7 full bathrooms, 2 partial bathrooms, an elevator, a 3-car garage, a majestic heated infinity swimming pool and private spa, an indoor sports court, and a huge balcony with stunning 180 degree views overlooking the canyon and the city. The grand master suite features a walk-in closet, dual sinks, jetted-soaking bathtub, separate shower, sauna, and bidet. Upon entering the spacious living room, you are greeted by amazing high ceilings, a beautiful fireplace, and a wet bar that are perfect for relaxing or entertaining guests. The gourmet kitchen features granite countertops, center island, and a spacious pantry. The home office/library has a beautiful custom built-in desk and bookshelves. Conveniently located near shopping centers, parks, schools, restaurants, and 57 and 60 freeway, this elegant estate is in the excellent Walnut School District.

CRMLS #TR20187388

May 18, 2021

Listing Removed

—

Sep 9, 2020

Listed

$2,780,000

$353/sq ft

CRMLS #TR20094199

Aug 31, 2020

Listing Removed

—

Aug 21, 2020

Price Changed

$2,780,000

$353/sq ft

May 18, 2020

Listed

$2,880,000

$365/sq ft

CRMLS #TR19129248

Dec 4, 2019

Listing Removed

—

Jun 3, 2019

Listed

$2,980,000

$378/sq ft

Public Records

Feb 13, 2014

Sold

$1,830,000

$232/sq ft

CRMLS #TR14026203

Feb 13, 2014

Listing Removed

—

Feb 13, 2014

Sold

$1,830,000

$232/sq ft

Feb 7, 2014

Listing Removed

—

Feb 5, 2014

Listed

$1,790,000

$227/sq ft

CRMLS #S587619

Nov 6, 2009

Sold

$1,072,000

$136/sq ft

Nov 3, 2009

Pending

—

Oct 28, 2009

Pending

—

Aug 31, 2009

Listed

$1,215,700

$154/sq ft

CRMLS #H09033531

Jun 1, 2009

Listing Removed

—

Mar 21, 2009

Listed

$1,650,000

$209/sq ft

CRMLS #12095959

Jun 29, 2009

Listing Removed

—

Jul 16, 2007

Listed

$1,695,000

$215/sq ft

CRMLS #H08130823

Mar 10, 2009

Listing Removed

—

Sep 11, 2008

Listed

$1,650,000

$209/sq ft

CRMLS #Z07107730

Nov 1, 2007

Listing Removed

—

Jul 24, 2007

Listed

$1,695,000

$215/sq ft

CRMLS #12096073

Oct 30, 2007

Listing Removed

—

Jul 16, 2007

Listed

$1,695,000

$215/sq ft

CRMLS #C101170

Nov 4, 2007

Listing Removed

—

Jun 1, 2007

Listed

$1,695,000

$215/sq ft

CRMLS #Z07106557

Jul 20, 2007

Listing Removed

—

Jul 17, 2007

Listed

$1,695,000

$215/sq ft

CRMLS #C415440

Jan 2, 2005

Listing Removed

—

Aug 27, 2004

Listed

$1,198,000

$152/sq ft

CRMLS #H403042

Aug 25, 2004

Listing Removed

—

Mar 24, 2004

Listed

$1,170,000

$148/sq ft

Public Records

Apr 19, 1995

Sold

$630,000

$80/sq ft

Public Records

Jun 30, 1988

Sold

$610,000

$77/sq ft

Public Records

Sep 1, 1983

Sold

$125,000

$16/sq ft

Year

Property tax

Land + Additions

Assessment*

2025

$35,883 (+18.5%)

$1,877,512 + $1,068,255

$2,945,767

2024

$30,292 (+2.6%)

$1,840,699 + $1,047,310

$2,888,009

2023

$29,514 (+15.4%)

$1,456,560 + $1,040,400

$2,496,960

2022

$25,581 (+1.9%)

$1,428,000 + $1,020,000

$2,448,000

2021

$25,097 (+1.3%)

$958,777 + $1,155,155

$2,113,932

2020

$24,775 (+1.9%)

$939,978 + $1,132,505

$2,072,483

2019

$24,301 (+4.2%)

$930,340 + $1,120,893

$2,051,233

2018

$23,320 (+4.8%)

$912,099 + $1,098,915

$2,011,014

2017

$22,242 (+3.2%)

$876,682 + $1,056,244

$1,932,926

2016

$21,558 (−0.6%)

$876,682 + $1,056,244

$1,932,926

2015

$21,699 (+9.0%)

$859,493 + $1,035,534

$1,895,027

2014

$19,915 (+18.4%)

$526,495 + $1,145,898

$1,672,393

2012

$16,826 (+18.6%)

$524,116 + $894,472

$1,418,588

2011

$14,190 (+9.6%)

$513,840 + $876,934

$1,390,774

2010

$12,951 (−5.6%)

$503,765 + $676,357

$1,180,122

2009

$13,712 (+2.6%)

$500,000 + $572,000

$1,072,000

2008

$13,367

$573,591 + $562,118

$1,135,709

Public record

Public record
Zoning

Beds

Baths

Stories

—

Lot width

—

Lot depth

—

Lot size

1.1 Acres

Year renovated

1992

Finished Sq. Ft.

7,884

Unfinished Sq. Ft.

—

Total Sq. Ft.

7,884

Year built

1987

Style

Single Family Residential

County

Los Angeles County

APN

8713031006

Parking Spaces

—

Basement

—

Accessible

—

HOA Dues

—

Garage

—

Features

—

Last updated by owner on Oct 29, 2026.

Rural Residential District

The RR zoning district identifies hillside areas intended for rural living, including the keeping of animals, with supporting accessory structures. The maximum allowed density for new residential subdivisions within this zoning district will be one dwelling unit per gross acre, or lower densities where required by chapter 22.22 (Hillside Management). The RR zoning district is consistent with the rural 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

Local insights from Redfin agents

The Diamond Bar market is shifting, creating new opportunities for both buyers and sellers. Buyers have a bit more negotiating room, while well-priced, well-maintained homes can still attract strong interest. If you’re considering a move, I’d be...
2 weeks ago • Diamond Bar
Sang Ur
Redfin Premier agent
124 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

5/10 Heat Factor

4 days above 98° expected this year, 11 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

84/ 100

Very good sunlight

Sunscore

This home ranks in the top 20% for direct sun exposure in Diamond Bar. There appears to be minimal shading by surrounding buildings, terrain, and vegetation.

8.5 hrs

5.6 hrs

JuneDecember

Provided by Shadowmap

Redfin Estimate for 23240 Ridge Line

$2,963,831

$106K under list price of $3.07M

Nearby comparable homes

The Redfin Estimate uses 6 recent nearby sales, priced between $1.2M to $2.6M.

SOLD OCT 16, 2026
$1,688,888 Last sold price
5 beds3.5 baths4,375 sq ft
2169 Rocky Vw, Diamond Bar, CA 91765
$3/sq ft
10 years older
SOLD OCT 16, 2026
$1,179,999 Last sold price
4 beds2.5 baths1,915 sq ft
23308 Quail Smt, Diamond Bar, CA 91765
$227/sq ft
smaller lot
12 years older
SOLD SEP 24, 2026
$1,450,000 Last sold price
5 beds3 baths2,806 sq ft
1590 Deer Crossing Dr, Diamond Bar, CA 91765
Re/Max Premier Properties
$128/sq ft
smaller lot
9 years older
SOLD APR 30, 2026
$2,650,000 Last sold price
5 beds4.5 baths4,850 sq ft
2501 Reata Pl, Diamond Bar, CA 91765
$157/sq ft
smaller lot
SOLD SEP 29, 2026
$1,358,000 Last sold price
4 beds2.5 baths2,587 sq ft
22060 Cedardale Dr, Diamond Bar, CA 91765
$136/sq ft
smaller lot
4 years older
SOLD NOV 2, 2026
$1,435,000 Last sold price
5 beds3 baths3,203 sq ft
24222 Brookwood Dr, Diamond Bar, CA 91765
Rubio Real Estate
$59/sq ft
smaller lot
1 year older

Rental earnings

Est. $5,407 per month, based on comparable rentals

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Details provided by CRMLS and may not match the public record. Learn more.

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GreatSchools Ratings provided by GreatSchools.org.

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About this home

Payment calculator

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See this home in person

Nearby open houses (10)

Interested in buying?

Around this home

Schools

Lifestyle

Offer insights

Property details

Sale and tax history for 23240 Ridge Line

Public record

Local insights from Redfin agents

Climate risks

Historical weather

Sun exposure

Redfin Estimate for 23240 Ridge Line

Early Access listings

Nearby similar homes

New listings for sale in 91765

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