21743 Castleton St, Cupertino, CA 95014 Property Records

Santa Clara County property record for 21743 Castleton St, Cupertino, CA 95014

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 2,934 sqft · built 1966
Lot Size	0.17 acres (7,400 sqft)
Owner	Company Name on Record
Last Sale	$1,800,000 (Apr 2013)
Tax Bill	$26,897 (2025)
Deeds & Mortgages	Aug 2020 Mortgage Jan 2021 Transfer + 1 more
Flood Zone	Zone X (moderate risk)
APN	`356-18-070`

Property Details

APN / Parcel Number

Primary APN	`356-18-070`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Total Rooms	8 Rooms
Stories	1 Story
Building Area	2,934 sqft Living Area
Gross Area	1,571 sqft
1st Floor Area	1,571 sqft
Family Room	Family Room

Exterior

Year Built	Built 1966
Effective Year Built	Effective 1980
Architectural Style	L-Shape
Construction Type	Wood
Lot Area	7,400 sqft (0.17 acres)
Lot Dimensions	100 ft deep x 74 ft wide
Garage Area	483 sqft
Parking Spaces	2 Parking Spaces
Porch	None

Utilities, Heating & Cooling

Heating System	HVAC

Location & Zoning

Street Address	21743 CASTLETON ST
City	CUPERTINO
State	CA
Zip	95014-4704
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	CU
Legal Description	TRACT 4104 MONTEBELLO BOOK 220 PAGE 12 PAGE 13 LOT 93
Legal Subdivision	MONTEBELLO
Legal Tract	4104
Legal Lot Number	93
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	Company Name on Record
Mailing Address	21743 CASTLETON ST, CUPERTINO, CA 95014-4704
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
Aug 26, 2020	Deed of Trust, Mortgage · Conventional Mortgage US BANK NA
Jan 21, 2021	Quit Claim Deed, Transfer COMMONWEALTH LAND TITLE INSURANCE, COMMONWEALTH LAND TITLE CO.
Jan 21, 2021	Intrafamily Transfer, Transfer · Conventional Mortgage QUICKEN LOANS LLC

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Apr 26, 2013 · Amount on Record
Deed Sale	Apr 26, 2013 · Amount on Record
Deed Document Number	201322192246
Prior Transfer Date	Jan 3, 1996
Prior Transfer Doc	0013157539
Record Updated	Oct 29, 2026

August 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SANTA CLARA CA
Property Address	21743 CASTLETON ST, CUPERTINO, CA 95014-4704
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	21743 CASTLETON ST, CUPERTINO, CA 95014-4704

Mortgage

Document Number	0024589960
Date	Aug 26, 2020
Instrument	24589960

Lender

Name	US BANK NA
Type	Bank
Address	OWENSBORO, KY 42301

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Sep 1, 2050

Interest

Rate Type	Adjustable Rate
Rate	2.75%
Type Change Date	Sep 1, 2027
Min Rate At Change	2.75%
Max Rate At Change	7.75%
Index	1-Year CMT
Max Rate	7.75%

January 2021: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	SANTA CLARA CA
Recording Date	Jan 21, 2021
Property Address	21743 CASTLETON ST, CUPERTINO, CA 95014-4704
Document Number	0024795081
Instrument Date	Jan 13, 2021
Instrument	24795081
Transaction Type	Transfer
Record Updated	Feb 2, 2021
Title Company	COMMONWEALTH LAND TITLE INSURANCE, COMMONWEALTH LAND TITLE CO.

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Revocable Trust
Address	21743 CASTLETON ST CUPERTINO CA 950144704, CUPERTINO, CA 95014-4704

January 2021: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SANTA CLARA CA
Recording Date	Jan 21, 2021
Property Address	21743 CASTLETON ST, CUPERTINO, CA 95014-4704
Document Number	0024795079
Map Reference	MB 220 PG 12&13
Instrument Date	Jan 13, 2021
Instrument	24795079
Transaction Type	Transfer
Record Updated	Sep 1, 2021
Title Company	FIDELITY NATIONAL TITLE

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	Community Property with Right of Survivorship
Address	21743 CASTLETON ST, CUPERTINO, CA 95014-4704

Mortgage

Document Number	0024795080
Date	Jan 21, 2021
Instrument	24795080

Lender

Name	QUICKEN LOANS LLC
Type	Mortgage Company

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Feb 1, 2051

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		$2,260,890 (+2%) Land $1,808,715 Building $452,175
2025	$26,897.00 (+3.7%)	$2,216,559 (+4.04%) Land $1,773,250 Building $443,309
2023	$25,938.00 (+1.23%)	$2,130,490 Land $1,704,394 Building $426,096
2022	$25,624.00

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	0.02% annual chance
Exposure	Indirect within 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 345 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 2,000
Verizon Fixed Wireless	300 / 20
Etheric Networks Fixed Wireless	250 / 100
Ridge Wireless Fixed Wireless	100 / 60
AT&T DSL	100 / 20

Cell Coverage

5G (outdoors only) and 4G LTE

Nearby Properties on Castleton St

Nearby Streets

Search Property Records by Address or Parcel Number

Search by:

By searching, you agree to: Terms • Privacy • Disclosures