21020 Cornerstone Dr
Walnut, CA 91789
4 Beds
3.5 Baths
1,873 sqft
4 Beds
3.5 Baths
1,873 sqft
Local Information
- Map ViewExplore the area around 21020 Cornerstone Dr.
- Schools1 Elementary School1 Middle School1 High School
- Shop & Eat
-- mins to
Description
4 beds, 3.5 baths, and 1873 sq ft
No smoking inside this property
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 January 2019 with an asking price of $3,000 per month. That rental listing was removed on March 11, 2019. It is currently off market. The Trulia Estimate is $1,018,000, with a rent estimate of $4,112/month.
Home Highlights
Parking
Attached Garage
Outdoor
No Info
A/C
Cooling only
HOA
None
Price/Sqft
No Info
Listed
41 days ago
Home Details for 21020 Cornerstone Dr
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Property Type / Style Property Type: Apartment |
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Lease Term: 1 YearAvailable: now |
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Appliances & Utilities DishwasherDryerRefrigeratorWasher |
Heating & Cooling Air ConditioningCooling System: Central Air |
Room & Shared Space Room is not furnished |
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Parking & Garage Parking: Attached, On Site |
Price History for 21020 Cornerstone Dr
| Date | Price | Event | Source |
|---|---|---|---|
| 03/11/2019 | $3,000 | ListingRemoved | Agent Provided |
| 01/22/2019 | $3,000 | Listed For Rent | Agent Provided |
| 08/04/2017 | $3,000 | Sold | N/A |
Market trends in Walnut
Last updated May 2026
Avg. sale price
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Sale-to-List Price
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Price per sq ft
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Available listings
59
14MoM
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Property Tax and Assessment
| Year | 2025 |
|---|---|
| Tax | $10,150 |
| Assessment | $823,430 |
Home facts updated by county records
Comparable Sales for 21020 Cornerstone Dr
Address | Distance | Property Type | Sold Price | Sold Date | Bed | Bath | Sqft |
|---|---|---|---|---|---|---|---|
2.23 | Multi-Family Home | $1,588,168 | 01/09/26 | 1 | 1 | 300 | |
2.36 | Apartment | $320,000 | 08/29/25 | 2 | 2 | 949 | |
2.59 | Apartment | $638,500 | 06/17/26 | 2 | 1.5 | 1,048 | |
2.36 | Apartment | $310,000 | 07/10/25 | 2 | 1 | 807 | |
2.36 | Apartment | $310,000 | 10/22/25 | 1 | 1 | 768 | |
3.91 | Apartment | $679,000 | 05/27/26 | 3 | 3 | 1,442 | |
3.77 | Apartment | $400,000 | 02/05/26 | 2 | 1 | 968 | |
5.23 | Apartment | $1,260,000 | 12/05/25 | 3 | 2 | 1,202 | |
5.53 | - | - | - | 2 | 3 | 1,215 | |
5.79 | Apartment | $255,000 | 12/10/25 | 3 | 2 | 1,140 |
Home facts updated by county records
Nearby homes
Get a sense of prices in the area by checking nearby homes.
SOLDAPR 2, 2026HomeSmart, Evergreen Realty
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Assigned Schools
These are the assigned schools for 21020 Cornerstone Dr.
- Suzanne Middle School
- 6-8
- Public
- 1190 Students
10/10GreatSchools RatingParent Rating AverageAbsolutely atrocious. Students were not taught the difference between right and wrong. Teachers do absolutely nothing to stop bullying. Also, according to the office manager, my kid- along with a few others are the only ones that passed the state tests.Parent Review7y ago - Vejar Elementary School
- K-5
- Public
- 631 Students
8/10GreatSchools RatingParent Rating AverageThis is our 3rd year at this school (k-2nd) two of our children currently attend. We love the staff, we love how involved the principal is, and have had some great luck with teachers. My children are truly cared for and we are looking forward to my daughter starting TK next year.Parent Review4y ago - Walnut High School
- 9-12
- Public
- 2148 Students
10/10GreatSchools RatingParent Rating AverageThis is my last year in high school for me but that doesn’t mean I can forget about walnut high school. Through out my years at walnut high school I have learned a lot from them and that is because of the counselors, our teachers and principal. Without them we as students wouldn’t have gone far in high school. All of the sports and really good because of the couches we have and there dedication to the team and to the school. So I would definitely recommend walnut high school for your kids.Student Review5y ago 
Check out schools near 21020 Cornerstone Dr.
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
80 % Say yards are well-kept
80 % Say it's dog friendly
74 % 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 kids play outside
43 % Say it's walkable to restaurants
29 % Say there are community events
Sourced by Trulia users. Learn more about our methodology.
LGBTQ Local Legal Protections
LGBTQ Local Legal Protections
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