21753 Castleton St, Cupertino, CA 95014 Property Records

Santa Clara County property record for 21753 Castleton St, Cupertino, CA 95014

Property Summary

Property Type	Single Family Home
Details	5 bd · 3 ba · 2,840 sqft · built 1966
Lot Size	0.176 acres (7,650 sqft)
Owner	2 Individual Names on Record
Last Sale	$3,150,000 (Dec 2020)
Tax Bill	$40,699 (2025)
Deeds & Mortgages	Dec 2020 Sale & Mortgage Oct 2017 Mortgage + 1 more
Flood Zone	Zone X (moderate risk)
APN	`356-18-071`

Property Details

APN / Parcel Number

Primary APN	`356-18-071`

Interior

Bedrooms	5 Beds
Full Baths	3 Baths
Total Rooms	10 Rooms
Stories	2 Stories
Building Area	2,840 sqft Living Area
Gross Area	2,665 sqft
1st Floor Area	1,619 sqft
2nd Floor Area	1,046 sqft
Family Room	Family Room
Utility Room	Utility Room
Fireplaces	1 Fireplace
Fireplace	Fireplace

Exterior

Year Built	Built 1966
Effective Year Built	Effective 1975
Architectural Style	Custom Design
Exterior Material	Stucco
Construction Type	Wood
Roof Material	Other
Lot Area	7,650 sqft (0.176 acres)
Lot Dimensions	102 ft deep x 75 ft wide
Garage Area	451 sqft
Parking Spaces	2 Parking Spaces
Pool Type	Pool with Hot Tub/Spa
Pool Area	400 sqft
Porch	Porch

Utilities, Heating & Cooling

Heating System	HVAC
Heating Fuel	Gas
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	21753 CASTLETON ST
City	CUPERTINO
State	CA
Zip	95014-4704
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	TRACT 4104 MONTEBELLO BOOK 220 PAGE 12 PAGE 13 LOT 92
Legal Subdivision	MONTEBELLO
Legal Tract	4104
Legal Lot Number	92
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	21753 CASTLETON ST, CUPERTINO, CA 95014-4704
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Community Property

Deeds, Mortgages & Sale History

Date	Document
Dec 11, 2020	Grant Deed, Transfer · Conventional Mortgage BANK OF AMERICA NA
Oct 16, 2017	Deed of Trust, Mortgage BANK OF AMERICA
May 19, 2017	Grant Deed, Transfer · ARM AMERICAN PACIFIC MORTGAGE

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Dec 11, 2020 · Amount on Record
Deed Sale	Dec 11, 2020 · Amount on Record
Prior Sale	May 19, 2017 · Amount on Record
Deed Document Number	202024745580
Prior Transfer Date	Oct 9, 2010
Prior Transfer Doc	0020957722
Record Updated	Oct 29, 2026

December 2020: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SANTA CLARA CA
Recording Date	Dec 11, 2020
Property Address	21753 CASTLETON ST, CUPERTINO, CA 95014-4704
Document Number	0024745580
Map Reference	MB 220 PG 12&13
Instrument Date	Dec 4, 2020
Instrument	24745580
Transaction Type	Transfer
Record Updated	Sep 1, 2021
Title Company	LAWYERS TITLE COMPANY

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property with Right of Survivorship
Address	21753 CASTLETON ST, CUPERTINO, CA 95014-4704

Mortgage

Document Number	0024745581
Date	Dec 11, 2020
Instrument	24745581

Lender

Name	BANK OF AMERICA NA
Type	Bank

Agreement

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

October 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SANTA CLARA CA
Property Address	21753 CASTLETON ST, CUPERTINO, CA 95014-4704
Document Number	0023784762
Instrument Date	Oct 16, 2017
Transaction Type	Mortgage
Record Updated	Aug 27, 2018
Title Company	OTHER

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property
Address	21753 CASTLETON ST CUPERTINO CA 950144704, CUPERTINO, CA 95014-4704

Mortgage

Document Number	0023784762
Date	Oct 25, 2017
Instrument	23784762

Lender

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

Agreement

Amount	Amount Recorded
Term	360 Months
Due	Oct 24, 2047

May 2017: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	SANTA CLARA CA
Recording Date	May 19, 2017
Property Address	21753 CASTLETON ST, CUPERTINO, CA 95014-4704
Document Number	0023654529
Map Reference	MAP220 PG12&13
Instrument Date	May 17, 2017
Instrument	23654529
Transaction Type	Transfer
Record Updated	Sep 1, 2021
Title Company	CORNERSTONE TITLE COMPANY

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property with Right of Survivorship
Address	1248 PHYLLIS AVE, CUPERTINO, CA 95014

Mortgage

Document Number	0023654530
Date	May 19, 2017
Instrument	23654530

Lender

Name	AMERICAN PACIFIC MORTGAGE
Type	Mortgage Company

Agreement

Type	ARM
Amount	Amount Recorded
Term	361 Months
Due	Jun 1, 2047

Interest

Rate Type	Adjustable Rate
Rate	3.87%
Type Change Date	Jun 1, 2027
Change Frequency	Annually
Min Rate At Change	2.25%
Max Rate At Change	8.87%
Index	1-Year LIBOR
Max Rate	8.87%

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		$3,477,851 (+2%) Land $3,303,960 Building $173,891
2025	$40,699.00 (+3.65%) Homeowner's exemption	$3,409,659 (+4.04%) Land $3,239,177 Building $170,482
2023	$39,264.00 (+1.55%) Homeowner's exemption	$3,277,260 Land $3,113,397 Building $163,863
2022	$38,663.00

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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