21673 Castleton St, Cupertino, CA 95014 Property Records

Santa Clara County property record for 21673 Castleton St, Cupertino, CA 95014

Property Summary

Property Type	Single Family Home
Details	4 bd · 2.5 ba · 2,119 sqft · built 1966
Lot Size	0.171 acres (7,455 sqft)
Owner	Company Name on Record
Last Sale	$1,950,000 (Jun 2015)
Tax Bill	$28,294 (2025)
Deeds & Mortgages	Feb 2023 Transfer Jul 2020 Mortgage
Flood Zone	Zone X (moderate risk)
APN	`356-18-065`

Property Details

APN / Parcel Number

Primary APN	`356-18-065`

Interior

Bedrooms	4 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	9 Rooms
Stories	2 Stories
Building Area	2,119 sqft Living Area
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
Construction Type	Wood
Lot Area	7,455 sqft (0.171 acres)
Lot Dimensions	105 ft deep x 71 ft wide
Garage Area	451 sqft
Parking Spaces	2 Parking Spaces
Porch	Porch

Utilities, Heating & Cooling

Heating System	HVAC

Location & Zoning

Street Address	21673 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 4104 MONTEBELLO BOOK 220 PAGE 12 PAGE 13 LOT 98
Legal Subdivision	MONTEBELLO
Legal Tract	4104
Legal Lot Number	98
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	21673 CASTLETON ST, CUPERTINO, CA 95014-4712
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
Feb 17, 2023	Intrafamily Transfer, Transfer
Jul 24, 2020	Deed of Trust, Mortgage · Conventional Mortgage CITIBANK NA

Assessor's Deed Record

Deed Names	Name on Deed
Last Sale	Jun 12, 2015 · Amount on Record
Deed Sale	Jun 12, 2015 · Amount on Record
Deed Document Number	201522984280
Last Transfer Date	Jan 20, 2023
Transfer Doc	0025439184
Record Updated	Sep 20, 2026

February 2023: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SANTA CLARA CA
Recording Date	Feb 17, 2023
Property Address	21673 CASTLETON ST, CUPERTINO, CA 95014-4712
Document Number	0025439184
Map Reference	MB 220 PG 12&13
Instrument Date	Jan 20, 2023
Instrument	25439184
Transaction Type	Transfer
Record Updated	Jun 7, 2023

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	Revocable Trust
Address	21673 CASTLETON ST, CUPERTINO, CA 95014-4712

July 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SANTA CLARA CA
Property Address	21673 CASTLETON ST, CUPERTINO, CA 95014-4712
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	SERVICELINK

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0024552759
Date	Jul 24, 2020
Instrument	24552759

Lender

Name	CITIBANK NA
Type	Bank
Address	O FALLON, MO 63368

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	312 Months
Due	Jul 1, 2046

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		$2,390,469 (+2%) Land $1,912,379 Building $478,090
2025	$28,294.00 (+3.64%) Homeowner's exemption	$2,343,598 (+4.04%) Land $1,874,882 Building $468,716
2023	$27,301.00 (+1.04%)	$2,252,595 Land $1,802,079 Building $450,516
2022	$27,021.00

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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