21643 Castleton St, Cupertino, CA 95014 Property Records

Santa Clara County property record for 21643 Castleton St, Cupertino, CA 95014

Property Summary

Property Type	Single Family Home
Details	5 bd · 4.5 ba · 2,886 sqft · built 1966
Lot Size	0.172 acres (7,500 sqft)
Owner	2 Individual Names on Record
Last Sale	$940,000 (Dec 2002)
Tax Bill	$18,877 (2025)
Deeds & Mortgages	Nov 2021 Mortgage Feb 2021 Mortgage
Flood Zone	Zone X (moderate risk)
APN	`356-18-063`

Property Details

APN / Parcel Number

Primary APN	`356-18-063`

Interior

Bedrooms	5 Beds
Full Baths	4.5 Baths
Half Baths	1 Half Bath
Total Rooms	9 Rooms
Stories	2 Stories
Building Area	2,886 sqft Living Area
Gross Area	2,119 sqft
1st Floor Area	1,339 sqft
2nd Floor Area	780 sqft
Family Room	Family Room
Utility Room	Utility Room
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1966
Effective Year Built	Effective 1966
Architectural Style	L-Shape
Exterior Material	Stucco
Construction Type	Wood
Roof Material	Wood Shingle
Lot Area	7,500 sqft (0.172 acres)
Lot Dimensions	100 ft deep x 75 ft wide
Garage Area	451 sqft
Parking Spaces	2 Parking Spaces
Porch	Porch

Utilities, Heating & Cooling

Cooling System	HVAC
Heating System	Forced Air with A/C
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	21643 CASTLETON ST
City	CUPERTINO
State	CA
Zip	95014-4712
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	TRACT 4103 MONTEBELLO BOOK 206 PAGE 16 PAGE 17 LOT 36
Legal Subdivision	MONTEBELLO
Legal Tract	4103
Legal Lot Number	36
Jurisdiction	SANTA CLARA CA
Township / Civil Division	SAN JOSE
Census Block Group	2
Census Block	2006
Census Tract	507702

Owner

Source: Santa Clara County records, as of July 27, 2026

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

Owner of Record	2 Individual Names on Record
Mailing Address	21643 CASTLETON ST, CUPERTINO, CA 95014-4712
Occupancy	Owner Occupied
Owner Type	Individual

Deeds, Mortgages & Sale History

Date	Document
Nov 10, 2021	Intrafamily Transfer, Transfer · Conventional Mortgage PROVIDENT FUNDING ASSOCIATES LP
Feb 1, 2021	Deed of Trust, Mortgage · Conventional Mortgage LENOX FINANCIAL MORTGAGE CORP

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Dec 23, 2002 · Amount on Record
Deed Sale	Dec 23, 2002 · Amount on Record
Prior Sale	Jul 5, 2001 · Amount on Record
Deed Document Number	200216704095
Last Transfer Date	Nov 5, 2021
Transfer Doc	0025161184
Record Updated	Sep 20, 2026

November 2021: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SANTA CLARA CA
Recording Date	Nov 10, 2021
Property Address	21643 CASTLETON ST, CUPERTINO, CA 95014-4712
Document Number	0025161184
Map Reference	MB 206 PG 16&17
Instrument Date	Nov 5, 2021
Instrument	25161184
Transaction Type	Transfer
Record Updated	Nov 22, 2021
Title Company	WFG NATIONAL TITLE INS CO

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants
Address	21643 CASTLETON ST, CUPERTINO, CA 95014-4712

Mortgage

Document Number	0025161185
Date	Nov 10, 2021
Instrument	25161185

Lender

Name	PROVIDENT FUNDING ASSOCIATES LP
Type	Mortgage Company

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	181 Months
Due	Dec 1, 2036

February 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SANTA CLARA CA
Property Address	21643 CASTLETON ST, CUPERTINO, CA 95014-4712
Transaction Type	Mortgage
Record Updated	Feb 9, 2021
Title Company	TWFG NATIONAL TITLE INSURANCE COMPANY, WFG NATIONAL TITLE INS CO

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	21643 CASTLETON ST, CUPERTINO, CA 95014-4712

Mortgage

Document Number	0024810306
Date	Feb 1, 2021
Instrument	24810306

Lender

Name	LENOX FINANCIAL MORTGAGE CORP
Type	Mortgage Company
Address	SANTA ANA, CA 92707

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	180 Months
Due	Feb 1, 2036

Tax Assessment & Valuation

Source: Santa Clara County assessment roll, as of July 27, 2026

Property Jurisdictions

Type	Name
State	California
County	Santa Clara County
Municipality	Cupertino City
Elementary School District	Cupertino Union Elementary School District (KG - 08)
Secondary School District	Fremont Union High School District (09 - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$1,557,819 (+2%) Land $1,034,106 Building $523,713
2025	$18,877.00 (+3.76%)	$1,527,275 (+4.04%) Land $1,013,830 Building $513,445
2023	$18,193.00 (+0.83%)	$1,467,970 Land $974,462 Building $493,508
2022	$18,044.00

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

Flood

Source: FEMA National Flood Hazard Layer, effective January 18, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X moderate risk
500-Year Floodplain	Yes 0.2% annual chance
Flood Insurance Requirement	Not required lenders may require it
Community Rating System	Class 6 (20% premium discount)
Nearby Flood Policies	2 in force

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.

Wildfire

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	Low lower than 80% of the US · lower than 88% of California
Wildfire Likelihood	0.01% annual chance
Exposure	None beyond ember reach

Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.

Drinking Water

Source: EPA Safe Drinking Water Information System, as of September 2026

Water System	SAN JOSE WATER private · serves 1,039,920 people · EPA ID CA4310011
Water Source	Surface water
Last State Inspection	Mar 2026
Lead	Under 1 ppb (2023–2025) action level 15 ppb

Violations Reported to EPA

Water Quality	Treatment failure resolved · Jun 2023
Treatment and Procedure	None last 10 years
Monitoring and Reporting	None last 3 years

Results are for the whole water system, not water tested at this address; lead at the tap also depends on the building's own pipes.

Internet Providers

Source: FCC Broadband Data Collection, based on 685 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 2,000
Verizon Fixed Wireless	1,000 / 75
Etheric Networks Fixed Wireless	250 / 100
Ridge Wireless Fixed Wireless	100 / 60
AT&T DSL · Fiber in parts of the area	100 / 20

May also be available: GeoLinks, T-Mobile.

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