Alameda County property record for 20171 Sheldon Ct, Castro Valley, CA 94546 · Last verified August 2026
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 2 ba · 1,340 sqft · built 1957 |
| Lot Size | 0.145 acres (6,328 sqft) |
| Owner | Individual Name on File |
| Tax Bill | $4,978 (2025) |
| Flood Zone | Zone X (minimal risk) |
| APN | 84C-669-81-3 |
| Primary APN | 84C-669-81-3 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 2 Baths |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,340 sqft Living Area |
| Year Built | Built 1957 |
|---|---|
| Effective Year Built | Effective 1958 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 6,328 sqft (0.145 acres) |
| Street Address | 20171 SHELDON CT |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-4610 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00026 BLK: TR: 1788 |
| Legal Tract | 1788 |
| Legal Block | B |
| Legal Lot Number | 27 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 3 |
| Census Block | 3011 |
| Census Tract | 430800 |
Source: Alameda County records · APN 84C-669-81-3
Assessment roll updated August 5, 2026 · Last verified August 2026
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 | 20171 SHELDON CT, CASTRO VALLEY, CA 94546-4610 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Transfer Date | Apr 23, 2010 |
| Transfer Doc | 0000316566 |
| Record Updated | Sep 20, 2026 |
Source: Alameda County records · Assessment roll updated August 5, 2026 · Last verified August 2026
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | Castro Valley Unified School District (KG - 12) |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $355,151 (+2%) Land $111,947 Building $243,204 | ||
| 2025 | $4,978.00 (+4.4%) | $348,188 (+4.04%) Land $109,752 Building $238,436 | |
| 2023 | $4,768.00 | $334,670 Land $105,491 Building $229,179 | $966,600 |
Source: FEMA National Flood Hazard Layer, Alameda County (06001C), updated May 25, 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 | Minimal |
| 500-Year Floodplain | No |
| 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; lenders make the official flood determination.
Source: FCC Broadband Data Collection, availability as of December 31, 2025 · Published October 2026 · based on 777 locations within about half a mile of this property
| Provider | Technology | Download / Upload (Mbps) |
|---|---|---|
| Sonic Telecom | Fiber | 10,000 / 10,000 |
| AT&T | Fiber | 5,000 / 5,000 |
| Xfinity | Cable | 2,000 / 250 |
| Verizon | Fixed Wireless | 300 / 20 |
| Etheric Communications, LLC. | Fixed Wireless (licensed-by-rule) | 250 / 100 |
| T-Mobile USA | Fixed Wireless | 100 / 20 |
| AT&T | DSL | 100 / 20 |
May also be available at this address: AT&T, California Internet. Availability varies by address; speeds are provider-advertised maximums, not measured.
5G and 4G LTE
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