21623 Castleton St is a 1,571 square foot house on a 7,500 square foot lot with 3 bedrooms and 2 bathrooms. - it last sold on May 15, 1974 for $56,900. Based on Redfin's Cupertino data, we estimate the home's value is $3,081,156.
Single-familyProperty Type
1966Year Built
7,500 sq ftLot Size
$1,961Est. Price/Sq.Ft.
Source:Public Records
Redfin Estimate
$3,081,156
$3.0M since sold in May 1974$71K since September
Recently sold homes
Estimate history
Homes for sale
This home's estimate is 4.9% higher than the average sale price ($2.94M) of 6 comparable homes.
*Taxable value of land and structures on it ("additions") is determined regularly by local assessors and does not affect market price.
Zoning and permits
Zoning
Permits
R1-7.5
Single-Family Residential Zone
Single-family residence districts are intended to create, preserve and enhance areas suitable for detached dwellings in order to: Enhance the identity of residential neighborhoods; Ensure provision of light, air and a reasonable level of privacy to individual residential parcels; Ensure a reasonable level of compatibility in scale of structures within residential neighborhoods; and Reinforce the predominantly low-intensity setting in the community.
Permitted uses
Include but are not limited to:
Housing-Single unit
Housing-Senior
Housing-Other
Infrastructure
Jul 19, 2019 • Final
Residential re-roof
Remove and replace the roof with CDX plywood and asphalt composition shingles.
Roofing
Jul 19, 2019 • Final
Residential mechanical
Install a gas insert.
Gas
Permit history is from public records and may be incomplete or inaccurate. Redfin and its agents make no representations about the property condition or permit status. Buyers should independently verify all information.
Property details
Interior
Fireplace Information
# of Fireplaces: 1
Has Fireplace
Room Information
# of Rooms: 7
Exterior
Exterior Information
Physical Condition: Average
Building Style Type: L-Shape
Construction Type: Wood
Building Construction Quality: Good
Roof Framing Type: Wood
Property Information
Subdivision Name: MONTEBELLO
Living Sq. Ft: 1,571
Ground Floor Sq. Ft: 1,571
Building Sq. Ft: 1,571
# of Stories: 1
Legal Description: TRACT 4103 MONTEBELLO BOOK 206 PAGE 16 PAGE 17 LOT 35
Parking & Garage Information
Garage/Parking Sq. Ft: 483
Lot Information
# of Buildings: 1
Land Sq. Ft: 7,500
Legal Lot Number: 35
Municipality Name: CUPERTINO CITY
Acres: 0.1722
Depth Footage: 100
Front Footage: 75
Zoning Code: R1
County Use Description: RESID SINGLE FAMILY
Financial
Assessor Information
Assessment Year: 2026
Tax Area: CUPERTINO CITY
Public facts
Beds: 3
Baths: 2.0
Sq. Ft.: 1,571
Stories: 1.0
Lot Size: 7,500 square feet
Style: Single Family Residential
Year Built: 1966
Year Renovated: 1966
County: Santa Clara County
APN: 35618062
Home facts updated by county records on Aug 22, 2026
Around this home
Schools
Abraham Lincoln Elementary School
Public K-5 • Assigned • 0.5mi
9/10
John F. Kennedy Middle School
Public 6-8 • Assigned • 0.3mi
9/10
Monta Vista High School
Public 9-12 • Assigned • 0.5mi
10/10
Provided by GreatSchools
Lifestyle
Provided by Walk Score and Local Logic
Climate risks
1/10 Flood Factor
Minimal risk of a flood reaching the building in the next 30 years
1/10 Fire Factor
Unlikely to be in a wildfire in next 30 years
4/10 Heat Factor
8 days above 95° expected this year, 17 days in 30 years
1/10 Wind Factor
Minimal risk of severe winds over next 30 years
8/10 Air Factor
16 unhealthy days expected this year, 17 days in 30 years
Provided by First Street
Historical weather
Cupertino, CA • 95014
Average low and high temperatures (°F)
60
42
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69
47
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46
74
49
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80
55
82
58
80
60
75
54
63
47
60
45
Jan
Feb
Mar
Apr
May
Jun
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Aug
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Sun exposure
In this area, properties receive around 10.8 hours in
June and 4.9 hours in December, placing it above the
U.S. average for solar exposure.
10.8 hrs
4.9 hrs
JuneDecember
Provided by Shadowmap
Estimated sale price
$2.93M – $3.54M
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