Recently Viewed Properties
See This Home
Save This Listing
Close

View All Photos

$948,000 Just Listed

  • For Sale
  • Active
  • Condo
  • 4 Beds
  • 3 Full Baths
  • 1,830 Sq. Ft.
  • 2 Car Garage
  • Updated 1 hour ago
See This Home
Save This Home
See This Home
Save This Home
Welcome to 21010 Cornerstone, nestled in a highly sought-after neighborhood in Walnut. This spacious 4-bedroom, 3-bathroom home offers a wonderful blend of comfort, functionality, and inviting living spaces, making it an ideal place to call home. The thoughtfully designed interior features an updated kitchen that opens seamlessly into a spacious living room, creating an open and welcoming atmosphere perfect for entertaining guests or enjoying everyday living. The expansive main living area provides plenty of room to gather with family and friends, while a beautiful private balcony just off the living space offers the perfect spot to enjoy the fresh air, unwind, and relax. The generously sized primary suite serves as a comfortable retreat, complete with a walk-in closet and an en-suite bathroom featuring a dual-sink vanity and walk-in shower. Additional conveniences include a dedicated laundry room and an attached two-car garage, providing practical storage and everyday ease. Beyond the home itself, residents can enjoy a desirable community lifestyle with access to a swimming pool, neighborhood park, and BBQ area-ideal for outdoor recreation, gatherings, and making lasting memories. Located within a community surrounded by award-winning schools, this property offers an appealing combination of space, convenience, and lifestyle in the heart of Walnut. With its inviting layout, desirable amenities, and sought-after location, 21010 Cornerstone presents a wonderful opportunity to enjoy comfortable living in a welcoming community.

Full Property Details for 21010 Cornerstone

General

  • Price: $948,000
  • HOA FEE: $306/month
  • Status: Active
  • Type: Condo
  • Source: MRMLS
  • MLS ID: PW26223459
  • Updated: 10/15/2026
  • Added to Site: 1 day(s) ago

Interior

  • Rooms/Areas: Walk-In Closet, Primary Bedroom, Laundry, Foyer, Living Room, Primary Bathroom
  • Interior Features: 2 Staircases, Stone Counters, Granite Counters
  • Fireplace(s): None
  • Eating Areas: Dining Room, In Kitchen
  • Appliances: Microwave, Refrigerator, Gas Range, Dishwasher
  • Flooring: Laminate

Rooms

Bathrooms

  • Total Bathrooms: 3
  • Full Bathrooms: 3

Bedrooms

  • Total Bedrooms: 4

Other Rooms

  • Laundry: Inside, Individual Room, Washer Included, Dryer Included

Additional Information

  • Shared Amenities: Playground, Dog Park, Barbecue, Picnic Area
  • Pool Description: Community
  • Spa Description: Association

Exterior

  • Deck/Patio: Deck

Parking

  • Garage: Yes
  • Garage Spaces: 2
  • Parking: Garage

Location

  • County: Los Angeles
  • Driving Directions: Off Valley Blvd and Suzanne

School Information

  • School District: Walnut Valley Unified

Community

  • Community Features: Gutters, Dog Park, Sidewalks, Park
  • Assoc. Name: The Management Trust

Heating & Cooling

  • Cooling Type: Central Air
  • Heating Type: Central

Utilities

  • Sewer: Public Sewer
  • Water: Public

Structural Information

  • Structure Type: Condominium
  • Construction: Stucco
  • Roof: Tile
  • Common Walls: 2 Common Walls (or More)
  • Windows: Double-Pane Windows
  • Entry Location: Front
  • Stories/Levels: Three Or More,Two
  • Stories Description: Three Or More, Two
  • Square Feet: 1,830
  • Sq. Ft. Source: Assessor
  • Year Built: 2018
  • Year Built Source: Public Records
  • Property Condition: Turnkey

Unit Information

  • Units in Complex: 98

Lot Features

  • Property View: Neighborhood
  • Lot Size (Acres): 0.4011
  • Lot Size (Sq. Ft.): 17,474
  • Lot Size Source: Assessor

Financial Considerations

  • Price Per Sq. Ft.: $518.03
  • Association Fee: $306
  • Assoc Fee Freq.: Monthly

Disclosures and Reports

  • Special Conditions: Standard

Listed by Seven Gables Real Estate, AJ Hoover

Quickly Find Out More

* Indicates a required field

Yes, I would like more information. Please use and/or share my information with a Coldwell Banker ® affiliated agent to contact me about my real estate needs. By clicking Send Message, I request to be contacted by phone or text message and consent to being contacted by automated means. I understand that my consent to receive calls or texts is not a condition of purchasing any property, goods, or services. Alternatively, I understand that I can access real estate services by email or I can contact the agent myself.

If an Coldwell Banker affiliated agent is not available in the area where I need assistance, I agree to be contacted by a real estate agent affiliated with another brand owned or licensed by Anywhere Real Estate (BHGRE®, CENTURY 21®, Corcoran®, ERA®, or Sotheby’s International Realty®). I acknowledge that I have read and agree to the Terms of Use and Privacy Notice.

We Value Your Privacy

Listing agent

— 21010 Cornerstone —

  • AJ Hoover

    Seven Gables Real Estate

ajh@sevengables.com

Get Pre-Approved Today

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Price & Sales History for 21010 Cornerstone Get Price Alerts and Save Property

Date
Details
Price
Change
Source
10/14/2026
Listed
$948,000
11.92%
MLS
11/29/2021
Sold
$847,000
—
Public Record
Get Price Alerts and Save Property
Disclaimer: Historical sales information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Tax History for 21010 Cornerstone

Year
Property Taxes
Change
Tax Assessment
Change
2025
$11,140
—
$916,817
2%
2025
$11,140
8%
$898,841
4%
2023
$10,354
2%
$863,940
2%
2022
$10,139
7%
$847,000
7%
2021
$9,487
4%
$790,000
3%
2020
$9,096
1%
$766,774
2%
2019
$8,967
4%
$751,740
2%
2018
$8,624
—
$737,000
—
Disclaimer: Historical tax information is derived from public records provided by the county offices. Information is not guaranteed and should be independently verified.

Estimate the Cost for 21010 Cornerstone

$
Down Payment
%
$
%

$
$
$

*These costs are estimates, and the interest rates assume exceptional credit standing.

Be ready to buy your new home!

with our affiliated lender
NMLS#: 1598647

Get Pre-Approved

Listed by Seven Gables Real Estate, AJ Hoover

Just Listed near 21010 Cornerstone

This is a carousel with tiles that activate property listing cards. Use the previous and next buttons to navigate.

800 Grand Ave, Diamond Bar, CA 91765 - Photo 1 Just Listed
$509,000

800 Grand Ave  #A15  Diamond Bar, CA 91765

  • Condo
  • Active
  • Updated 21 hours ago
  • 2
    Beds
  • 2
    Total Baths
  • 828
    Sq. Ft.
3125 S Ridge Point Dr, Diamond Bar, CA 91765 - Photo 1 Just Listed
$1,780,000
Open House

3125 S Ridge Point Dr  Diamond Bar, CA 91765

  • Single Family
  • Active
  • Updated 2 days ago
  • 5
    Beds
  • 4
    Total Baths
  • 3,453
    Sq. Ft.
23553 Canyon Vista Ct, Diamond Bar, CA 91765 - Photo 1 Just Listed
$2,068,000

23553 Canyon Vista Ct  Diamond Bar, CA 91765

  • Single Family
  • Active
  • Updated 1 day ago
  • 5
    Beds
  • 5
    Total Baths
  • 4,725
    Sq. Ft.
1123 Cleghorn, Diamond Bar, CA 91765 - Photo 1 Just Listed
$999,999

1123 Cleghorn  Diamond Bar, CA 91765

  • Single Family
  • Active
  • Updated 14 hours ago
  • 4
    Beds
  • 2
    Total Baths
  • 1,771
    Sq. Ft.

Price Reduced near 21010 Cornerstone

This is a carousel with tiles that activate property listing cards. Use the previous and next buttons to navigate.

1313 Fairlance, Diamond Bar, CA 91789 - Photo 1 Price Reduced
-$100,000 (-8%)
$1,150,000
Open House

1313 Fairlance  Diamond Bar, CA 91789

  • Single Family
  • Active
  • Updated 1 hour ago
  • 5
    Beds
  • 3
    Total Baths
  • 2,304
    Sq. Ft.
23450 Amberwick Pl, Diamond Bar, CA 91765 - Photo 1 Price Reduced
-$20,000 (-1.33%)
$1,479,900
Open House

23450 Amberwick Pl  Diamond Bar, CA 91765

  • Single Family
  • Active
  • Updated 1 day ago
  • 4
    Beds
  • 3
    Total Baths
  • 2,344
    Sq. Ft.
24435 Nan Ct, Diamond Bar, CA 91765 - Photo 1 Price Reduced
-$27,000 (-2.04%)
$1,298,000

24435 Nan Ct  Diamond Bar, CA 91765

  • Single Family
  • Active
  • Updated 8 hours ago
  • 5
    Beds
  • 3
    Total Baths
  • 2,585
    Sq. Ft.
20977 E Canyon Ridge Ln, Diamond Bar, CA 91789 - Photo 1 Price Reduced
-$40,000 (-3.1%)
$1,250,000

20977 E Canyon Ridge Ln  Diamond Bar, CA 91789

  • Single Family
  • Active
  • Updated 1 day ago
  • 3
    Beds
  • 3
    Total Baths
  • 2,120
    Sq. Ft.

Recent Sales near 21010 Cornerstone

This is a carousel with tiles that activate property listing cards. Use the previous and next buttons to navigate.

6 Skyline, Phillips Ranch, CA 91766 - Photo 1 Sold
$868,000

6 Skyline  Phillips Ranch, CA 91766

  • Single Family
  • Closed
  • 4
    Beds
  • 3
    Total Baths
  • 2,020
    Sq. Ft.
8 Quiet Hollow Rd, Phillips Ranch, CA 91766 - Photo 1 Sold
$878,000

8 Quiet Hollow Rd  Phillips Ranch, CA 91766

  • Single Family
  • Closed
  • 3
    Beds
  • 3
    Total Baths
  • 1,948
    Sq. Ft.
5 Navajo Trail Ln, Phillips Ranch, CA 91766 - Photo 1 Sold
$915,000

5 Navajo Trail Ln  Phillips Ranch, CA 91766

  • Single Family
  • Closed
  • 4
    Beds
  • 3
    Total Baths
  • 2,020
    Sq. Ft.
34 Mesa Ridge Dr, Phillips Ranch, CA 91766 - Photo 1 Sold
$925,000

34 Mesa Ridge Dr  Phillips Ranch, CA 91766

  • Single Family
  • Closed
  • 3
    Beds
  • 3
    Total Baths
  • 2,360
    Sq. Ft.

21010 Cornerstone, Walnut, CA 91789 (MLS# PW26223459) is a Condo property with 4 bedrooms and 3 full bathrooms. 21010 Cornerstone is currently listed for $948,000 and was received on October 14, 2026. Want to learn more about 21010 Cornerstone? Do you have questions about finding other Condo real estate for sale in Walnut? You can browse all Walnut real estate or contact a Coldwell Banker agent to request more information.

Tour this property