Santa Clara County property record for 21594 Castleton St, Cupertino, CA 95014 · Last verified October 2025
| Property Type | Single Family Home |
|---|---|
| Details | 5 bd · 3 ba · 2,412 sqft · built 1973 |
| Lot Size | 0.213 acres (9,315 sqft) |
| Owner | Owner Name on File |
| Last Sale | $1,525,000 (May 2005) |
| Tax Bill | $25,661 (2025) |
| Flood Zone | Zone X (moderate risk) |
| APN | 356-20-046 |
| Primary APN | 356-20-046 |
|---|
| Bedrooms | 5 Beds |
|---|---|
| Full Baths | 3 Baths |
| Total Rooms | 11 Rooms |
| Stories | 2 Stories |
| Building Area | 2,412 sqft Living Area |
| 1st Floor Area | 1,440 sqft |
| 2nd Floor Area | 972 sqft |
| Family Room | Family Room |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1973 |
|---|---|
| Architectural Style | Other |
| Construction Type | Wood |
| Lot Area | 9,315 sqft (0.213 acres) |
| Lot Dimensions | 115 ft deep x 81 ft wide |
| Terrain | Gentle Slope |
| Garage Area | 420 sqft |
| Parking Spaces | 2 Parking Spaces |
| Pool Type | Pool with Hot Tub/Spa |
| Pool Area | 4,980 sqft |
| Heating System | HVAC |
|---|
| Street Address | 21594 CASTLETON ST |
|---|---|
| City | CUPERTINO |
| State | CA |
| Zip | 95014-4703 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | TR 5081 LOT 21 |
| Legal Subdivision | MONTEBELLO |
| Legal Tract | 5081 |
| Legal Lot Number | 21 |
| Jurisdiction | SANTA CLARA CA |
| Township / Civil Division | SAN JOSE |
| Census Block Group | 2 |
| Census Block | 2011 |
| Census Tract | 507702 |
Source: Santa Clara County records · APN 356-20-046
Assessment roll updated July 1, 2025 · Last verified October 2025
Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.
| Owner of Record | Owner Name on File |
|---|---|
| Mailing Address | 21594 CASTLETON ST, CUPERTINO, CA 95014-4703 |
| Occupancy | Owner Occupied |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | May 27, 2005 · Amount on Record |
| Deed Sale | May 27, 2005 · Amount on Record |
| Prior Sale | May 27, 2005 · Amount on Record |
| Deed Document Number | 0018392434 |
| Last Transfer Date | Nov 12, 2009 |
| Transfer Doc | 0020504558 |
| Record Updated | Jun 07, 2026 |
Source: Santa Clara County records · Assessment roll updated July 1, 2025 · Last verified October 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) |
Assessed value is set for property tax purposes and is not a market price estimate.
| Year | Tax Bill | Assessed Value |
|---|---|---|
| 2025 | $25,661.00 (+3.73%) Homeowner's exemption | $2,125,708 (+4.04%) Land $1,393,911 Building $731,797 |
| 2023 | $24,738.00 (+2.24%) Homeowner's exemption | $2,043,167 Land $1,339,785 Building $703,382 |
| 2022 | $24,195.00 |
Source: FEMA National Flood Hazard Layer, Santa Clara County (06085C), updated January 18, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060855077022, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X |
|---|---|
| Special Flood Hazard Area | No |
| Flood Hazard | Moderate |
| 500-Year Floodplain | Yes |
| Community Rating System | Class 6 (20% premium discount) |
| Nearby Flood Policies | 2 in force |
| Wildfire Risk | Not rated no burnable land in reach |
|---|---|
| Wildfire Likelihood | Negligible |
| Exposure | None beyond ember reach |
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: FCC Broadband Data Collection, availability as of December 31, 2025 · Published October 2026 · based on 685 locations within about half a mile of this property
| Provider | Technology | Download / Upload (Mbps) |
|---|---|---|
| Xfinity | Cable | 2,000 / 2,000 |
| Verizon | Fixed Wireless | 1,000 / 75 |
| Etheric Communications, LLC. | Fixed Wireless (licensed-by-rule) | 250 / 100 |
| Ridge Wireless | Fixed Wireless (unlicensed) | 100 / 60 |
| AT&T | DSL | 100 / 20 |
May also be available at this address: AT&T, T-Mobile USA, California Internet. Availability varies by address; speeds are provider-advertised maximums, not measured.
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