2. 21036 Cornerstone Dr Walnut CA
21036 Cornerstone Dr Walnut CA

Report Results for

21036 Cornerstone Dr Walnut, CA

21036 Cornerstone Dr Walnut, CA 91789 was built in 2018 and last sold for $710,000. 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 962,000, reflecting a -1% change over the past year, with 4 beds, 3 baths, and approximately 1,760 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

$710,000
Last sold Dec 11, 2025
4
Beds
3
Baths
1,760
Sqft
Off Market
$962,000 estimated value
Built in 2018
$547/sqft
$276 HOA fees

Property characteristics

Property type
Residential
Zoning type
Condominium
APN
8720-047-091
Subdivision
Gallery At Cornerstone
Heating
Central
Cooling
Yes

Property History

Over the last 12 months, the sales price of 21036 Cornerstone Dr Walnut, CA 91789 has decreased by -1%, and the tax increased by 5%.

Price History

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Year Price Price/Sq Ft
2026 $ 952,000 -1 % $ 541
2025 $ 963,000 -12 % $ 547
2024 $ 1,098,000 19 % $ 624
2023 $ 915,000 5 % $ 520
2022 $ 871,000 12 % $ 495
2021 $ 771,000 ---- $ 438

Tax History

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Year Taxes Assesments
2025 $ 10,240 5 % $ 824,012
2024 $ 9,750 2 % $ 807,856
2023 $ 9,508 2 % $ 792,016
2022 $ 9,310 1 % $ 776,487
2021 $ 9,137 ---- $ 761,262
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Owner

Mars Shaw Mars Shaw , Age 52

Lives at 21036 Cornerstone Dr, Walnut, CA 91789-2571
Relatives: Ming Hsiao, David Huang, Grace Huang, Hui Chang, Hung Chang, James Chiang, Lisa Chang, Yin Chang, Yu Chang
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People Living at 21036 Cornerstone Dr Walnut, CA

Mars Shaw Mars Shaw , Age 52

Lives at 21036 Cornerstone Dr, Walnut, CA 91789-2571 Walnut CA 91789 21036 Cornerstone Dr
Prior addresses: 174 W Lincoln Ave, Anaheim, CA 92805-2901 Anaheim CA 92805 174 W Lincoln Ave 9962 Bixby Cir, Villa Park, CA 92861-4107 Villa Park CA 92861 9962 Bixby Cir
Relatives: Ming Hsiao, David Huang, Grace Huang, Hui Chang, Hung Chang, James Chiang, Lisa Chang, Yin Chang, Yu Chang
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Chung Tong Chung Kwong Tong , Age 64

Lives at 1238 Saddlehorn Way, Walnut, CA 91789-5349 Walnut CA 91789 1238 Saddlehorn Way
Prior addresses: 3047 E Via Corvina, Ontario, CA 91764-7401 Ontario CA 91764 3047 E Via Corvina 389 Citrine Loop, Kissimmee, FL 34758-4373 Kissimmee FL 34758 389 Citrine Loop 5316 Tuscany LN, Davenport, FL 33897-3606 Davenport FL 33897 5316 Tuscany LN
Relatives: Ivan Tong
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Fei Liu Fei Hong Liu , Age 56

Lives at 1238 Saddlehorn Way, Walnut, CA 91789-5349 Walnut CA 91789 1238 Saddlehorn Way
Prior addresses: 3047 E Via Corvina, Ontario, CA 91764-7401 Ontario CA 91764 3047 E Via Corvina 3100 E Piru Ln, Brea, CA 92821-9105 Brea CA 92821 3100 E Piru Ln 389 Citrine LOOP, Kissimmee, FL 34758-4373 Kissimmee FL 34758 389 Citrine LOOP
Relatives: Alex Liulu, Eric Liu, Guo Liu, James Kuo, Long Liu, Yulan Liu, Alex Macias, Chen Liu, Cheng Liu
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Grace Chen Grace Huei-Chun Chen , Age 47

Lives at 21036 Cornerstone Dr, Walnut, CA 91789-2571 Walnut CA 91789 21036 Cornerstone Dr
Prior addresses: 174 W Lincoln Ave, Unit 555, Anaheim, CA 92805-2901 Anaheim CA 92805 174 W Lincoln Ave, Unit 555
Relatives: Angel Chen, Cheng Lu, Chia Chen, Chinghuang Chen, Chris Chen, Chung Chen, Diana Apanovich, Diane Chen, Grace Cheng
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Neighbors

21032 Cornerstone Dr
Walnut, CA
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21038 Cornerstone Dr
Walnut, CA
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21020 Cornerstone Dr
Walnut, CA
View Property Report
21022 Cornerstone Dr
Walnut, CA
View Property Report

FAQs

Who lives at 21036 Cornerstone Dr, Walnut, CA 91789?
According to our records, the current person living in 21036 Cornerstone Dr is Mars Shaw.
Is this property currently for sale?
The property is not for sale and last sold for $710,000 on Dec 11, 2025. 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 $962,000, reflecting a -1% 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 21032 Cornerstone Dr, 21038 Cornerstone Dr, and 21020 Cornerstone Dr, each with its own property report to help compare size, value, and residents.