2. 21010 Cornerstone Dr Walnut CA
21010 Cornerstone Dr Walnut CA

Report Results for

21010 Cornerstone Dr Walnut, CA

21010 Cornerstone Dr Walnut, CA 91789 was built in 2018 and last sold for $677,000. The property has recorded lot details and is listed as a Condominium. The property is currently not for sale. Current estimates place the value near 970,000, reflecting a -2% change over the past year, with 4 beds, 3 baths, and approximately 1,830 sq ft of living space. If you are looking to buy or rent a property, use USPhoneBook's property database to avoid rental scams, understand tax liabilities, and get a sense of the property's value over time. You can also check out the neighborhood section and see nearby homes, last sold for prices, tax records and more.
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Public Facts

$677,000
Last sold Mar 10, 2026
4
Beds
3
Baths
1,830
Sqft
Off Market
$970,000 estimated value
Built in 2018
$530/sqft
$305 HOA fees

Property characteristics

Property type
Residential
Zoning type
Condominium
APN
8720-047-080
Subdivision
Cornerstone Homeowners
Heating
Central
Cooling
Yes

Property History

Over the last 12 months, the sales price of 21010 Cornerstone Dr Walnut, CA 91789 has decreased by -2%, and the tax increased by 4%.

Price History

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Year Price Price/Sq Ft
2026 $ 943,000 -2 % $ 515
2025 $ 968,000 0 % $ 529
2024 $ 965,000 3 % $ 527
2023 $ 930,000 5 % $ 508
2022 $ 883,000 7 % $ 483
2021 $ 820,000 ---- $ 448

Tax History

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Year Taxes Assesments
2025 $ 11,140 4 % $ 898,841
2024 $ 10,617 2 % $ 881,218
2023 $ 10,354 2 % $ 863,940
2022 $ 10,139 6 % $ 847,000
2021 $ 9,487 ---- $ 790,000
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Owner

Guangshen Si Guangshen S Si , Age 36

Lives at 21010 Cornerstone Dr, Walnut, CA 91789-2571
Relatives: Chengke Tan, Meng Tan, Mengson Tan, Steven Si, Annie Yu, Betty Yu, Caddie Yu, Chia Yuchia, David Yu
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People Living at 21010 Cornerstone Dr Walnut, CA

Guangshen Si Guangshen S Si , Age 36

Lives at 21010 Cornerstone Dr, Walnut, CA 91789-2571 Walnut CA 91789 21010 Cornerstone Dr
Prior addresses: 328 Sefton Ave, Apt A, Monterey Park, CA 91755-3425 Monterey Park CA 91755 328 Sefton Ave, Apt A 257 S De Lacey Ave, Unit 2131, Pasadena, CA 91105-4516 Pasadena CA 91105 257 S De Lacey Ave, Unit 2131 515 John Muir Dr, Apt A616, San Francisco, CA 94132-6045 San Francisco CA 94132 515 John Muir Dr, Apt A616
Relatives: Chengke Tan, Meng Tan, Mengson Tan, Steven Si, Annie Yu, Betty Yu, Caddie Yu, Chia Yuchia, David Yu
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David Chung David H Chung , Age 40

Lives at 2519 Glen Hastings Ct, San Jose, CA 95148-4119 San Jose CA 95148 2519 Glen Hastings Ct
Prior addresses: 21010 Cornerstone DR, Walnut, CA 91789-2571 Walnut CA 91789 21010 Cornerstone DR
Relatives: Dung Chung, Howard Chung, Kevin Chung, Lucy Chung, Luong Chung, Nese Chung, Nhi Chung, Belinda Chong, Caleb Chung
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Ehteram Shamtoub Ehteram Shamtoub , Age 92

Lives at 21010 Cornerstone DR, Walnut, CA 91789-2571 Walnut CA 91789 21010 Cornerstone DR
Prior addresses: 5300 Newcastle Ave, Apt 80, Encino, CA 91316-3010 Encino CA 91316 5300 Newcastle Ave, Apt 80 17637 Bessemer ST, Encino, CA 91316-1212 Encino CA 91316 17637 Bessemer ST
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Fong Ching Fong Hung Ching , Age 54

Lives at 2021 Bluff Rd, Chino Hills, CA 91709-1733 Chino Hills CA 91709 2021 Bluff Rd
Prior addresses: 21010 Cornerstone DR, Walnut, CA 91789-2571 Walnut CA 91789 21010 Cornerstone DR 19362 Alcona ST, Rowland Hghts, CA 91748-3910 Rowland Hghts CA 91748 19362 Alcona ST
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Mo Chen Mo Chen , Age 44

Lives at 21010 Cornerstone DR, Walnut, CA 91789-2571 Walnut CA 91789 21010 Cornerstone DR
Prior addresses: 845 S Burnside Ave, Los Angeles, CA 90036-4744 Los Angeles CA 90036 845 S Burnside Ave 2840 Francis Ave, Apt 205, Los Angeles, CA 90005-4068 Los Angeles CA 90005 2840 Francis Ave, Apt 205 19520 93rd PL NE, Bothell, WA 98011-2379 Bothell WA 98011 19520 93rd PL NE
Relatives: James Chen, Jiang Jiang, Maggie Chen, Meiyu Chen, Ruobing Chen, Yan Chen, Yu Chen, Alvin Chen, Andrew Chen
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Ruoheng Wang Ruoheng Wang , Age 45

Lives at 3154 Payne Ranch Rd, Chino Hills, CA 91709-1500 Chino Hills CA 91709 3154 Payne Ranch Rd
Prior addresses: 21010 Cornerstone Dr, Walnut, CA 91789-2571 Walnut CA 91789 21010 Cornerstone Dr 8956 SW 171st AVE, Beaverton, OR 97007-6455 Beaverton OR 97007 8956 SW 171st AVE
Relatives: Juan Wang, Shiyun Wang, Yukang Wang, Tao Wang, Wang C, Xiuyun Wang, Yi Lin, Chen Lin, Chun Wang
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Yukang Wang Yukang Wang , Age 42

Lives at 21010 Cornerstone DR, Walnut, CA 91789-2571 Walnut CA 91789 21010 Cornerstone DR
Prior addresses: 3154 Payne Ranch RD, Chino Hills, CA 91709-1500 Chino Hills CA 91709 3154 Payne Ranch RD
Relatives: Juan Wang, Ruoheng Wang, Shiyun Wang, Tao Wang, Wang C, Xiuyun Wang, Yi Lin, Chen Lin, Chun Wang
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Corissa Hung Corissa Hung

Lives at 21010 Cornerstone DR, Walnut, CA 91789-2571 Walnut CA 91789 21010 Cornerstone DR
Prior addresses: 1834 David CT, West Covina, CA 91790-1126 West Covina CA 91790 1834 David CT
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Chengke Tan Chengke X Tan , Age 33

Lives at 1877 Benedict Way, Pomona, CA 91767-3507 Pomona CA 91767 1877 Benedict Way
Prior addresses: 3723 S Dulisse AVE, Ontario, CA 91761-5098 Ontario CA 91761 3723 S Dulisse AVE 21010 Cornerstone DR, Walnut, CA 91789-2571 Walnut CA 91789 21010 Cornerstone DR 11284 Terra Vista PKWY, Apt 117, Rancho Cucamonga, CA 91730-7443 Rancho Cucamonga CA 91730 11284 Terra Vista PKWY, Apt 117
Relatives: Guangshen Si, Meng Tan, Mengson Tan, Steven Si, Allyson Yu, Alvin Kwan, Annie Yu, Betty Yu, Derrick Chappell
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Neighbors

21000 Cornerstone Dr
Walnut, CA
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20988 Cornerstone Dr
Walnut, CA
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21006 Cornerstone Dr
Walnut, CA
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20990 Cornerstone Dr
Walnut, CA
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FAQs

Who lives at 21010 Cornerstone Dr, Walnut, CA 91789?
According to our records, the current person living in 21010 Cornerstone Dr is Guangshen Si.
Is this property currently for sale?
The property is not for sale and last sold for $677,000 on Mar 10, 2026. Use USPhoneBook to review nearby listings or compare similar homes in the area.
What is the estimated value of this property?
The estimated value is $970,000, reflecting a -2% change over the past year. You can explore price history and tax records to see how the value has changed over time.
How big is this property?
Complete property size and structural details are currently unavailable.
What nearby properties can I compare this to?
Nearby homes include 21000 Cornerstone Dr, 20988 Cornerstone Dr, and 21006 Cornerstone Dr, each with its own property report to help compare size, value, and residents.