21020 Cornerstone Dr, Walnut, CA 91789
OFF MARKET

$988,100

Trulia Estimate
as of Oct 10, 2026
  • 4 Beds
  • 3.5 Baths
  • 1,873 sqft

21020 Cornerstone Dr, Walnut, CA 91789

Home Highlights

Apartment
1,873 sqft
$528/sqft
Attached Garage

Local Information

  • Map ViewExplore the area around 21020 Cornerstone Dr.
  • Schools1 Elementary School1 Middle School1 High School
  • Shop & Eat
-- mins to
Commute Destination

About this House

What's unique:Attached two-car garageGourmet kitchenLarge center islandThoughtful designer finishes throughoutRemote-controlled motorized shadesAmple cabinetry
4 beds, 3.5 baths, and 1873 sq ft

No smoking inside this property
21020 Cornerstone Dr, Walnut, CA 91789 is a 4 bedroom, 4 bathroom, 1,873 sqft apartment. It last sold for $3,000 on Aug 4, 2017 (24% below the $3,950 asking price). More recently, it was listed as a rental in July 2026 with an asking price of $3,850 per month. That rental listing was removed on July 15, 2026. This property is not currently displayed as for sale or rent on Trulia. The Trulia Estimate is $988,100, with a rent estimate of $4,049/month.

Home Details for 21020 Cornerstone Dr

Property Information

Property Type / Style
Property Type: Apartment

Rental Terms, Policies & Fees

Lease Term: 1 YearAvailable: now

Interior Features

Appliances & Utilities
DishwasherDryerRefrigeratorWasher
Heating & Cooling
Air ConditioningCooling System: Central Air
Room & Shared Space
Room is not furnished

Exterior Features

Parking & Garage
Parking: Attached, On Site

Comparable Sales for 21020 Cornerstone Dr

Address
Distance
Property Type
Sold Price
Sold Date
Bed
Bath
Sqft
23635 Golden Springs Dr #10B, Diamond Bar, CA
2.36
Apartment
$295,000
10/02/26
2
2
949 sqft
23601 Golden Springs Dr #A-10, Diamond Bar, CA
2.36
Apartment
$331,000
07/07/26
2
2
949 sqft
1104 Cleghorn Dr #F, Diamond Bar, CA
2.59
Apartment
$638,500
06/17/26
2
1.5
1,048 sqft
2350 S Diamond Bar Blvd #L, Diamond Bar, CA
2.72
Apartment
$520,000
07/22/26
2
2
916 sqft
23617 Golden Springs Dr #K-1, Diamond Bar, CA
2.36
Apartment
$310,000
10/22/25
1
1
768 sqft
1521 Rose Ct, West Covina, CA
3.91
Apartment
$679,000
05/27/26
3
3
1,442 sqft
2145 E Aroma Dr #88, West Covina, CA
3.77
Apartment
$400,000
02/05/26
2
1
968 sqft
13133 Le Parc Blvd #709, Chino, CA
5.61
Apartment
$588,000
09/08/26
2
3
1,125 sqft
1030 Kent Dr, San Dimas, CA
5.79
Apartment
$255,000
12/10/25
3
2
1,140 sqft
16360 Canon Ln, Chino Hills, CA
6.22
Apartment
$740,000
06/30/26
3
2
1,216 sqft
Home facts updated by county records

Nearby homes

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Around this home

What Locals Say about Walnut

This October

Trick-or-Treat Score

Built from what locals say about this neighborhood.
  • 88% say there are sidewalks
  • 63% say there's holiday spirit
  • 47% say neighbors are friendly
Trulia Trick or TreatStart Ghost Hunt
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

  • 30 % 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

Price and Tax history

DateEventPrice
Jul 15, 2026
Source: CRMLS #TR26146812
ListingRemoved
$3,850
Jul 7, 2026
Source: CRMLS #TR26146812
Listed For Rent
$3,850
Mar 11, 2019
Source: Agent Provided
ListingRemoved
$3,000
Jan 22, 2019
Source: Agent Provided
Listed For Rent
$3,000
Aug 4, 2017
Source: N/A
Sold
$3,000

Frequently asked questions about 21020 Cornerstone Dr

  • What is 21020 Cornerstone Dr estimated to be worth?
    Trulia's estimated value for 21020 Cornerstone Dr in Walnut, CA is $988,100.
  • What is the price history for 21020 Cornerstone Dr?
    21020 Cornerstone Dr in Walnut, CA last sold for $3,000 in August 2017.
  • 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 21020 Cornerstone Dr have air conditioning?
    Yes, 21020 Cornerstone Dr in Walnut, CA has air conditioning.
  • Does 21020 Cornerstone Dr have laundry facilities?
    Yes, 21020 Cornerstone Dr in Walnut, CA has in-unit laundry.

Homes for rent near 21020 Cornerstone Dr

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Affordability

TIP:Try to keep your rent within a third of your gross household income. Learn why in our Renter's Guide.
For this property
PER YEAR
is the suggested income
Win over prospective landlords with your smart budgeting. As a good rule of thumb, ideally you would have at least three times your monthly rent in combined household income.
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