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21584 Castleton St, Cupertino, CA 95014 Property Records

Santa Clara County property record for 21584 Castleton St, Cupertino, CA 95014 · Last verified August 2026

Property Summary

Property TypeSingle Family Home
Details4 bd · 2.5 ba · 2,327 sqft · built 1973
Lot Size0.209 acres (9,085 sqft)
OwnerCompany Name on File
Tax Bill$2,896 (2025)
Deeds & MortgagesAug 2019 Transfer
Flood ZoneZone X (moderate risk)
APN356-20-047

Property Details

APN / Parcel Number

Primary APN356-20-047

Interior

Bedrooms4 Beds
Full Baths2.5 Baths
Half Baths1 Half Bath
Total Rooms8 Rooms
Stories1 Story
Building Area2,327 sqft Living Area
Gross Area2,135 sqft
1st Floor Area2,135 sqft
Family RoomFamily Room
Fireplaces1 Fireplace
FireplaceFireplace

Exterior

Year BuiltBuilt 1973
Effective Year BuiltEffective 1973
Architectural StyleH-Shape
Construction TypeWood
Lot Area9,085 sqft (0.209 acres)
Lot Dimensions115 ft deep x 79 ft wide
TerrainGentle Slope
Garage Area428 sqft
Parking Spaces2 Parking Spaces
PorchPorch

Utilities, Heating & Cooling

Heating SystemHVAC

Location & Zoning

Street Address21584 CASTLETON ST
CityCUPERTINO
StateCA
Zip95014-4703
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionTRACT 5081 MONTEBELLO BOOK 294 PAGE 24 LOT 22
Legal SubdivisionMONTEBELLO
Legal Tract5081
Legal Lot Number22
JurisdictionSANTA CLARA CA
Township / Civil DivisionSAN JOSE
Census Block Group2
Census Block2011
Census Tract507702

Owner

Source: Santa Clara County records · APN 356-20-047

Assessment roll updated July 27, 2026 · Last verified August 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of RecordCompany Name on File
Mailing Address8558 HIGHCREST DR, DARIEN, IL 60561-1678
Owner TypeCompany
VestingTrust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed NamesVerified Name on Deed
Last Transfer DateSep 29, 2015
Transfer Doc0023101517
Record UpdatedSep 20, 2026

August 2019: Affidavit of Death, Transfer

Document TypeAffidavit of Death
JurisdictionSANTA CLARA CA
Recording DateAug 15, 2019
Property Address21584 CASTLETON ST, CUPERTINO, CA 95014-4703
Document Number0024256712
Instrument DateAug 12, 2019
Instrument24256712
Transaction TypeTransfer
Record UpdatedAug 23, 2019
Title CompanyATTORNEY ONLY

Transaction

Tax$0.00
Additional
  • Multiple Parcels

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
RelationshipPersonal Trust
Address8558 HIGHCREST DR DARIEN IL 605611678, DARIEN, IL 60561-1678

Tax Assessment & Valuation

Source: Santa Clara County records · Assessment roll updated July 27, 2026 · Last verified August 2026

Property Jurisdictions

TypeName
StateCalifornia
CountySanta Clara County
MunicipalityCupertino City
Elementary School DistrictCupertino Union Elementary School District (KG - 08)
Secondary School DistrictFremont Union High School District (09 - 12)

Tax Bill & Assessment History

Assessed value is set for property tax purposes and is not a market price estimate.

YearTax BillAssessed Value
2026$157,007 (+2%) Land $29,895 Building $127,112
2025$2,896.00 (+4.89%)$153,929 (+4.04%) Land $29,309 Building $124,620
2023$2,761.00 (-6.12%)$147,954 Land $28,172 Building $119,782
2022$2,941.00

Flood & Wildfire

Source: FEMA National Flood Hazard Layer, Santa Clara County (06085C), updated January 18, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060855077022, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026

Flood

FEMA Flood ZoneZone X
Special Flood Hazard AreaNo
Flood HazardModerate
500-Year FloodplainYes
Community Rating SystemClass 6 (20% premium discount)
Nearby Flood Policies2 in force

Wildfire

Wildfire RiskNot rated
no burnable land in reach
Wildfire LikelihoodNegligible
ExposureNone
beyond ember reach

Values are read at the parcel center point; flood claims are located to the census block group, not this parcel; lenders make the official flood determination.

Internet Providers

Source: FCC Broadband Data Collection, availability as of December 31, 2025 · Published October 2026 · based on 685 locations within about half a mile of this property

ProviderTechnologyDownload / Upload (Mbps)
XfinityCable2,000 / 2,000
VerizonFixed Wireless1,000 / 75
Etheric Communications, LLC.Fixed Wireless (licensed-by-rule)250 / 100
Ridge WirelessFixed Wireless (unlicensed)100 / 60
AT&TDSL100 / 20

May also be available at this address: AT&T, T-Mobile USA, California Internet. Availability varies by address; speeds are provider-advertised maximums, not measured.

Mobile Coverage

5G and 4G LTE

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