21018 Cornerstone Dr, Walnut, CA 91789
Property image
Property image
OFF MARKET

21018 Cornerstone Dr
Walnut, CA 91789

  • 3 Beds
  • 4 Baths
  • 1,760 sqft (on 0.40 acres)

$892,400

Trulia Estimate
as of Aug 11, 2026
Est. Refi. Payment $5,480/mo*
Refinance Your Home

$892,400

Trulia Estimate
as of Aug 11, 2026
Est. Refi. Payment $5,480/mo*
Refinance Your Home
3 Beds
4 Baths
1,760 sqft
(on 0.40 acres)

Local Information

  • Map ViewExplore the area around 21018 Cornerstone Dr.
  • Schools1 Elementary School1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

Home Highlights

Property Type
Townhouse
Year Built
2018
Lot Size
0.4 acres
Living Area
1,760 sqft
Price/Sqft
$507
Parking
Garage

About this House

This townhouse is located at 21018 Cornerstone Dr, Walnut, CA. 21018 Cornerstone Dr is in Walnut, CA and in ZIP code 91789. This property has 3 bedrooms, 4 bathrooms and approximately 1,760 sqft of floor space. This property has a lot size of 0.40 acres and was built in 2018.
21018 Cornerstone Dr, Walnut, CA 91789 is a 3 bedroom, 4 bathroom, 1,760 sqft townhouse built in 2018. It last sold for $765,000 on Jul 12, 2021. More recently, it was listed as a rental in August 2023 with an asking price of $3,850 per month. That rental listing was removed on September 11, 2023. It is currently off market. The Trulia Estimate is $892,400, with a rent estimate of $3,911/month.

Home Details for 21018 Cornerstone Dr

Interior Features

Heating & Cooling
Heating: Forced Air, ElectricAir ConditioningCooling System: OtherHeating Fuel: Forced Air
Interior Details
Types of Rooms: Walk In Closet, Dining Room, Family Room
Appliances & Utilities
Dishwasher
Levels, Entrance, & Accessibility
Floors: Tile, Carpet, Laminate

Exterior Features

Exterior Home Features
Roof: Tile
Parking & Garage
GarageParking: Garage Detached

Property Information

Year Built
Year Built: 2018
Property Type / Style
Property Type: TownhouseArchitecture: Spanish

Community

Units in Building: 1

Lot Information

Lot Area: 0.40 acres

Price History for 21018 Cornerstone Dr

DatePriceEventSource
09/11/2023ListingRemovedZillow Rentals
09/06/2023$3,600PriceChange
Zillow Rentals
08/31/2023$3,850Listed For RentZillow Rentals
08/21/2023ListingRemovedZillow Rentals
07/31/2023$3,950Listed For RentZillow Rentals
08/01/2021ListingRemovedZillow Rental Manager
07/22/2021$3,650Listed For RentZillow Rental Manager
07/12/2021$765,000Sold
N/A
06/21/2021$756,800PendingCRMLS #TR21127443
10/14/2019$735,800ListingRemovedAgent Provided
08/23/2019$735,800Listed For SaleAgent Provided
08/31/2017$680,000Sold
CRMLS #OC17084084

Market trends in Walnut

Last updated June 2026
Buyer'sMarketSeller'sMarket
Avg. sale price
—
Sale-to-List Price
—
Price per sq ft
—
Available listings
75
16MoM
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Property Tax and Assessment

Year2025
Tax$10,098
Assessment$811,822
Home facts updated by county records

Comparable Sales for 21018 Cornerstone Dr

Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
20956 Cornerstone Dr, Walnut, CA
0.08
Townhouse
$888,000
10/16/25
3
3.5
1,760
923 Terrace Ln W #1, Diamond Bar, CA
1.82
Townhouse
$1,060,000
03/09/26
3
3
1,809
873 Terrace Ln W #4, Diamond Bar, CA
1.83
Townhouse
$1,350,000
09/04/25
4
4.5
2,420
1253 Porto Grande #2, Diamond Bar, CA
1.98
Townhouse
$798,800
07/14/26
3
3
1,485
1217 Porto Grande #1, Diamond Bar, CA
2.05
Townhouse
$770,000
01/23/26
3
3
1,642
1221 Porto Grande #4, Diamond Bar, CA
2.05
Townhouse
$792,000
12/15/25
3
3
1,642
22966 Estoril Dr #1, Diamond Bar, CA
2.02
Townhouse
$828,800
06/12/26
3
3
1,570
817 Terrace Ln E #7, Diamond Bar, CA
1.87
Townhouse
$1,390,000
07/28/26
4
5
2,430
22905 Colombard Ln #5, Diamond Bar, CA
2.21
Townhouse
$849,000
02/27/26
3
2.5
1,685
22933 Estoril Dr #1, Diamond Bar, CA
2.15
Townhouse
$803,000
09/04/25
3
2.5
1,468

Nearby homes

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Assigned Schools

These are the assigned schools for 21018 Cornerstone Dr.
View nearby schools on GreatSchools
The GreatSchools Rating compares schools on a variety of school quality indicators including test scores, college readiness, equity and more. Learn more.

What Locals Say about Walnut

At least 124 Trulia users voted on each feature.

  • 88 % Say there are sidewalks

  • 88 % Say parking is easy

  • 81 % Say car is needed

  • 81 % Say yards are well-kept

  • 80 % Say it's dog friendly

  • 75 % Say it's quiet

  • 72 % Say streets are well-lit

  • 68 % Say people would walk alone at night

  • 63 % Say it's walkable to grocery stores

  • 63 % Say there's holiday spirit

  • 62 % Say there's wildlife

  • 62 % Say they plan to stay for at least 5 years

  • 47 % Say neighbors are friendly

  • 44 % Say it's walkable to restaurants

  • 44 % Say kids play outside

  • 29 % Say there are community events

Sourced by Trulia users. Learn more about our methodology.
  • Nicholas R.
    "Very quiet neighborhood, not too much traffic, friendly neighbors. very nice and clean parks, that are close by. "
    4
    Flag
  • Angie.duran323
    "There’re lots of trails and long sidewalks in neighborhoods you can walk your dogs along. Sometimes all the dogs start barking at random times of day which is the only annoyance but other than that it’s great!"
    3
    Flag
  • T
    "City Walnut is known to have one the the best hiking trail in Southern California for adults, kids and pets"
    5
    Flag
  • Ronald G.
    "Public transportation is not very good. Especially for seniors living in the city. Stores are not really in walking distance and if you carry items, you will need to stop several times before getting home."
    1
    Flag
  • Ronald G.
    "The neighborhood is nice and people a generally nice. Easy to get around to stores and small shopping in the areas. If you want real shopping you have to leave the city."
    3
    Flag
  • sme2101
    "There are many families in our neighborhood, we have great parks, everyone is friendly and it’s a safe town"
    1
    Flag
  • Leslie a.
    "I lived here for about 6 years and I really enjoy the nature feel, the birds singing and the trails to walk on."
    2
    Flag
  • Fermin L.
    "I have lived here for the past 7 years and is a safe quiet neighborhood, great parks and city wide activities for children and adults, lots of trails to walk."
    1
    Flag
  • Needeposit
    "Living in the area for the last 20 years and in the same home for 12 years. Very safe area and one of the best school systems."
    1
    Flag
  • Ray
    "Great walking trails, very good schools and parks."
    1
    Flag

LGBTQ Local Legal Protections

Apartments for Rent

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Explore by feature - Pet Friendly

10 pet-friendly rentals in Walnut, CA

Explore by feature - Garage

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Explore by feature - Air Conditioning

20 rentals with air conditioning in Walnut, CA

Explore by feature - Pool

Explore by feature - Washer/dryer

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Explore by feature - Outdoor Space

13 rentals with an outdoor space in Walnut, CA

Homes for sale near 21018 Cornerstone Dr

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Off Market Homes Near 21018 Cornerstone Dr

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Frequently asked questions about 21018 Cornerstone Dr

  • What is 21018 Cornerstone Dr estimated to be worth?
    Trulia's estimated value for 21018 Cornerstone Dr in Walnut, CA is $892,400.
  • What is the price history for 21018 Cornerstone Dr?
    21018 Cornerstone Dr in Walnut, CA last sold for $765,000 in July 2021.
  • Is Walnut a buyer's or seller's market?
    Walnut is currently a seller's market, based on recent for-sale activity.
  • What do residents say about Walnut?
    Residents describe Walnut, CA as pedestrian-friendly, easy to park in, and well-kept. See recently sold homes in Walnut, CA.
  • Does 21018 Cornerstone Dr have air conditioning?
    Yes, 21018 Cornerstone Dr in Walnut, CA has air conditioning.
  • Does 21018 Cornerstone Dr have a garage?
    Yes, 21018 Cornerstone Dr in Walnut, CA has a garage.