Santa Clara County property record for 21713 Castleton St, Cupertino, CA 95014
| Property Type | Single Family Home |
|---|---|
| Details | 4 bd · 3 ba · 2,055 sqft · built 1967 |
| Lot Size | 0.184 acres (8,034 sqft) |
| Owner | Individual Name on File |
| Last Sale | $480,000 (Sep 1988) |
| Tax Bill | $11,505 (2025) |
| Flood Zone | Zone X (moderate risk) |
| APN | 356-18-068 |
| Primary APN | 356-18-068 |
|---|
| Bedrooms | 4 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 9 Rooms |
| Stories | 1 Story |
| Building Area | 2,055 sqft Living Area |
| 1st Floor Area | 2,055 sqft |
| Family Room | Family Room |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1967 |
|---|---|
| Architectural Style | Other |
| Construction Type | Wood |
| Lot Area | 8,034 sqft (0.184 acres) |
| Lot Dimensions | 103 ft deep x 78 ft wide |
| Garage Area | 440 sqft |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | HVAC |
|---|---|
| Heating System | HVAC |
| Street Address | 21713 CASTLETON ST |
|---|---|
| City | CUPERTINO |
| State | CA |
| Zip | 95014-4704 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | R1 |
| Legal Description | TR 4104 LOT 95 |
| Legal Subdivision | MONTEBELLO |
| Legal Tract | 4104 |
| Legal Lot Number | 95 |
| Jurisdiction | SANTA CLARA CA |
| Township / Civil Division | SAN JOSE |
| Census Block Group | 2 |
| Census Block | 2006 |
| Census Tract | 507702 |
Source: Santa Clara County assessment roll, as of July 1, 2025
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Individual Name on File |
|---|---|
| Mailing Address | 21713 CASTLETON ST, CUPERTINO, CA 95014-4704 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Sep 23, 1988 · Amount on Record |
| Deed Sale | Sep 23, 1988 · Amount on Record |
| Prior Sale | Jun 3, 2010 |
| Deed Document Number | 0009846863 |
| Deed Book / Page | 356 |
| Last Transfer Date | Aug 20, 2010 |
| Transfer Doc | 0020826222 |
| Record Updated | Jun 8, 2026 |
Source: Santa Clara County assessment roll, as of July 1, 2025
| 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) |
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2025 | $11,505.00 (+3.92%) Homeowner's exemption | $900,737 (+4.04%) Land $337,769 Building $562,968 |
| 2023 | $11,071.00 (-0.02%) Homeowner's exemption | $865,762 Land $324,654 Building $541,108 |
| 2022 | $11,073.00 |
Assessed value is set for property tax purposes and is not a market price estimate.
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.
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 |
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 |
| 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.
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 Communications, LLC. Fixed Wireless | 250 / 100 |
| Ridge Wireless Fixed Wireless | 100 / 60 |
| AT&T DSL | 100 / 20 |
5G (outdoors only) and 4G LTE
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