21593 Castleton St, Cupertino, CA 95014 Property Records

Santa Clara County property record for 21593 Castleton St, Cupertino, CA 95014

Property Summary

Property Type	Single Family Home
Details	5 bd · 2.5 ba · 2,604 sqft · built 1966
Lot Size	0.173 acres (7,548 sqft)
Owner	Company Name on Record
Tax Bill	$12,208 (2025)
Deeds & Mortgages	Apr 2022 Transfer Mar 2017 Mortgage
Flood Zone	Zone X (moderate risk)
APN	`356-18-059`

Property Details

APN / Parcel Number

Primary APN	`356-18-059`

Interior

Bedrooms	5 Beds
Full Baths	2.5 Baths
Half Baths	1 Half Bath
Total Rooms	10 Rooms
Stories	2 Stories
Building Area	2,604 sqft Living Area
Gross Area	2,300 sqft
1st Floor Area	1,150 sqft
2nd Floor Area	1,150 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	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	Porch

Utilities, Heating & Cooling

Heating System	HVAC

Location & Zoning

Street Address	21593 CASTLETON ST
City	CUPERTINO
State	CA
Zip	95014-4702
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R1
Legal Description	TRACT 4103 MONTEBELLO BOOK 206 PAGE 16 PAGE 17 LOT 32
Legal Subdivision	MONTEBELLO
Legal Tract	4103
Legal Lot Number	32
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	21593 CASTLETON ST, CUPERTINO, CA 95014-4702
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
Apr 19, 2022	Intrafamily Transfer, Transfer
Mar 15, 2017	Deed of Trust, Mortgage · Conventional Mortgage NEW PENN FINANCIAL LLC

Assessor's Deed Record

Deed Names	Name on Deed
Last Transfer Date	Apr 8, 2022
Transfer Doc	0025285856
Record Updated	Sep 20, 2026

April 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	SANTA CLARA CA
Recording Date	Apr 19, 2022
Property Address	21593 CASTLETON ST, CUPERTINO, CA 95014-4702
Document Number	0025285856
Map Reference	MB 206 PG 16&17
Instrument Date	Apr 8, 2022
Instrument	25285856
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	21593 CASTLETON ST, CUPERTINO, CA 95014-4702

March 2017: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	SANTA CLARA CA
Property Address	21593 CASTLETON ST, CUPERTINO, CA 95014-4702
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	CHICAGO TITLE COMPANY

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0023603150
Date	Mar 15, 2017
Instrument	23603150

Lender

Name	NEW PENN FINANCIAL LLC
Type	Mortgage Company
Address	PLYMOUTH MEETING, PA 19462

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	181 Months
Due	Apr 1, 2032

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		$973,236 (+2%) Land $500,786 Building $472,450
2025	$12,208.00 (+3.87%)	$954,154 (+4.04%) Land $490,967 Building $463,187
2023	$11,753.00 (+0.8%)	$917,104 Land $471,903 Building $445,201
2022	$11,660.00

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	0.01% annual chance
Exposure	None beyond 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 685 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 2,000
Verizon Fixed Wireless	1,000 / 75
Etheric Networks Fixed Wireless	250 / 100
Ridge Wireless Fixed Wireless	100 / 60
AT&T DSL · Fiber in parts of the area	100 / 20

May also be available: GeoLinks, T-Mobile.

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