21723 Castleton St, Cupertino, CA 95014 Property Records

Santa Clara County property record for 21723 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	0.173 acres (7,548 sqft)
Owner	2 Company Names on Record
Last Sale	$1,334,000 (Apr 2012)
Tax Bill	$20,521 (2025)
Deeds & Mortgages	Dec 2025 Transfer Oct 2020 Mortgage
Flood Zone	Zone X (moderate risk)
APN	`356-18-069`

Property Details

APN / Parcel Number

Primary APN	`356-18-069`

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	7,548 sqft (0.173 acres)
Lot Dimensions	102 ft deep x 74 ft wide
Garage Area	451 sqft
Parking Spaces	2 Parking Spaces
Porch	Slab

Utilities, Heating & Cooling

Heating System	HVAC

Location & Zoning

Street Address	21723 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 94
Legal Subdivision	MONTEBELLO
Legal Tract	4104
Legal Lot Number	94
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 May 21, 2026

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

Owner of Record	2 Company Names on Record
Mailing Address	21723 CASTLETON ST, CUPERTINO, CA 95014-4704
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust, Family Trust

Deeds, Mortgages & Sale History

Date	Document
Dec 22, 2025	Intrafamily Transfer, Transfer
Oct 21, 2020	Deed of Trust, Mortgage · Conventional Mortgage E MORTGAGE CAPITAL INC

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Apr 26, 2012 · Amount on Record
Deed Sale	Apr 26, 2012 · Amount on Record
Deed Document Number	201221639041
Last Transfer Date	Dec 19, 2025
Transfer Doc	0025921787
Record Updated	Sep 20, 2026

December 2025: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SANTA CLARA CA
Recording Date	Dec 22, 2025
Property Address	21723 CASTLETON ST, CUPERTINO, CA 95014-4704
Document Number	0025921787
Map Reference	MB 220 PG 12 & 13
Instrument Date	Dec 19, 2025
Instrument	25921787
Transaction Type	Transfer
Record Updated	Dec 30, 2025

Transaction

Tax	$0.00
Amount Accuracy	No Consideration Stated
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	21723 CASTLETON ST, CUPERTINO, CA 95014-4704

October 2020: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SANTA CLARA CA
Property Address	21723 CASTLETON ST, CUPERTINO, CA 95014-4704
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	FIRST AMERICAN TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	21723 CASTLETON ST, CUPERTINO, CA 95014-4704

Mortgage

Document Number	0024664741
Date	Oct 21, 2020
Instrument	24664741

Lender

Name	E MORTGAGE CAPITAL INC
Type	Mortgage Company
Address	SAN DIEGO, CA 92117

Agreement

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

Tax Assessment & Valuation

Source: Santa Clara County assessment roll, as of August 11, 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	$20,521.00 (+3.76%) Homeowner's exemption	$1,675,564 (+4.04%) Land $1,340,456 Building $335,108
2023	$19,778.00 (+0.94%) Homeowner's exemption	$1,610,502 Land $1,288,405 Building $322,097
2022	$19,593.00

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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