21663 Castleton St, Cupertino, CA 95014 Property Records

Santa Clara County property record for 21663 Castleton St, Cupertino, CA 95014

Property Summary

Property Type	Single Family Home
Details	5 bd · 3 ba · 2,822 sqft · built 1966
Lot Size	0.169 acres (7,400 sqft)
Owner	Company Name on Record
Last Sale	$1,575,000 (Feb 2007)
Tax Bill	$25,659 (2025)
Deeds & Mortgages	Aug 2019 Mortgage Sep 2018 Mortgage
Flood Zone	Zone X (moderate risk)
APN	`356-18-064`

Property Details

APN / Parcel Number

Primary APN	`356-18-064`

Interior

Bedrooms	5 Beds
Full Baths	3 Baths
Total Rooms	10 Rooms
Stories	2 Stories
Building Area	2,822 sqft Living Area
1st Floor Area	1,150 sqft
2nd Floor Area	1,150 sqft
Family Room	Family Room
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1966
Architectural Style	Other
Exterior Material	Stucco
Construction Type	Wood
Lot Area	7,400 sqft (0.169 acres)
Lot Dimensions	100 ft deep x 74 ft wide
Garage Area	451 sqft
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Heating System	HVAC

Location & Zoning

Street Address	21663 CASTLETON ST
City	CUPERTINO
State	CA
Zip	95014-4712
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	TR 4103 LOT 37
Legal Subdivision	MONTEBELLO
Legal Tract	4103
Legal Lot Number	37
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 October 20, 2025

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	21663 CASTLETON ST, CUPERTINO, CA 95014-4712
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
Aug 28, 2019	Quit Claim Deed, Transfer BANK OF AMERICA
Sep 25, 2018	Quit Claim Deed, Transfer BANK OF AMERICA

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Feb 14, 2007 · Amount on Record
Deed Sale	Feb 14, 2007 · Amount on Record
Prior Sale	Sep 25, 2018
Deed Document Number	0019303749
Last Transfer Date	Aug 28, 2019
Transfer Doc	0024265670
Record Updated	Jun 8, 2026

August 2019: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	SANTA CLARA CA
Recording Date	Aug 28, 2019
Property Address	21663 CASTLETON ST, CUPERTINO, CA 95014-4712
Document Number	0024265670
Instrument Date	Aug 22, 2019
Instrument	24265670
Transaction Type	Transfer
Record Updated	Sep 5, 2019
Title Company	TITLE CONNECT LLC

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	21663 CASTLETON ST CUPERTINO CA 950144712, CUPERTINO, CA 95014-4712

Mortgage

Document Number	24265671
Date	Aug 28, 2019
Instrument	24265671

Lender

Name	BANK OF AMERICA
Type	Bank
Address	101 S TRYON ST, CHARLOTTE, NC 28280-0002

Agreement

Amount	Amount Recorded
Term	360 Months
Due	Aug 27, 2049

Interest

Rate Type	Adjustable Rate
Rate	2.5%

September 2018: Quit Claim Deed, Transfer

Document Type	Quit Claim Deed
Jurisdiction	SANTA CLARA CA
Recording Date	Sep 25, 2018
Property Address	21663 CASTLETON ST, CUPERTINO, CA 95014-4712
Document Number	0024030643
Instrument Date	Sep 7, 2018
Instrument	24030643
Transaction Type	Transfer
Record Updated	Oct 8, 2018
Title Company	SERVICELINK

Transaction

Tax	$0.00
Additional	Quitclaim Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Joint Tenants with Right of Survivorship
Address	21663 CASTLETON ST CUPERTINO CA 950144712, CUPERTINO, CA 95014-4712

Mortgage

Document Number	24030644
Date	Sep 25, 2018
Instrument	24030644

Lender

Name	BANK OF AMERICA
Type	Bank
Address	101 S TRYON ST, CHARLOTTE, NC 28280-0002

Agreement

Amount	Amount Recorded
Term	360 Months
Due	Sep 24, 2048

Interest

Rate Type	Adjustable Rate
Rate	3.25%

Tax Assessment & Valuation

Source: Santa Clara County assessment roll, as of July 1, 2025

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
2025	$25,659.00 (+3.7%)	$2,110,155 (+4.04%) Land $1,582,285 Building $527,870
2023	$24,743.00 (+1.18%)	$2,028,217 Land $1,520,844 Building $507,373
2022	$24,454.00

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

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