Alameda County property record for 4217 Gem Ave, Castro Valley, CA 94546
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 1,080 sqft · built 1947 |
| Lot Size | 0.125 acres (5,460 sqft) |
| Owner | Trust Name on File |
| Tax Bill | $2,457 (2025) |
| Deeds & Mortgages | Jun 2018 Transfer Apr 2018 Transfer |
| Flood Zone | Zone X (minimal risk) |
| APN | 84C-669-45 |
| Primary APN | 84C-669-45 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 6 Rooms |
| Stories | 1 Story |
| Building Area | 1,080 sqft Living Area |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1947 |
|---|---|
| Effective Year Built | Effective 1947 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 5,460 sqft (0.125 acres) |
| Heating System | Floor/Wall Furnace |
|---|
| Street Address | 4217 GEM AVE |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-4652 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00007 BLK: 0002 TR: 0807 |
| Legal Tract | 0807 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 3 |
| Census Block | 3011 |
| Census Tract | 430800 |
4217 Gem Ave is held in a trust since May 2018.
Source: Alameda County records, as of August 5, 2026
| Owner of Record | Trust Name on File |
|---|---|
| Mailing Address | 4217 GEM AVE, CASTRO VALLEY, CA 94546-4652 |
| Owner Type | Company |
| Vesting | Trust |
Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.
| Date | Document |
|---|---|
| Jun 5, 2018 | Quit Claim Deed, Transfer ATTORNEY ONLY |
| Apr 9, 2018 | Quit Claim Deed, Transfer ATTORNEY ONLY |
| Deed Names | Name on Deed |
|---|---|
| Last Transfer Date | May 28, 2018 |
| Transfer Doc | 0000111005 |
| Record Updated | Sep 20, 2026 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Jun 5, 2018 |
| Property Address | 4217 GEM AVE, CASTRO VALLEY, CA 94546-4652 |
| Document Number | 0000111005 |
| Instrument Date | May 28, 2018 |
| Instrument | 111005 |
| Transaction Type | Transfer |
| Record Updated | Jun 19, 2018 |
| Title Company | ATTORNEY ONLY |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Personal Trust |
| Address | 4217 GEM AVE CASTRO VALLEY CA 945464652, CASTRO VALLEY, CA 94546-4652 |
| Document Type | Quit Claim Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Apr 9, 2018 |
| Property Address | 4217 GEM AVE, CASTRO VALLEY, CA 94546-4652 |
| Document Number | 0000071004 |
| Instrument Date | Mar 30, 2018 |
| Instrument | 71004 |
| Transaction Type | Transfer |
| Record Updated | Apr 20, 2018 |
| Title Company | ATTORNEY ONLY |
| Tax | $0.00 |
|---|---|
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Address | 4217 GEM AVE CASTRO VALLEY CA 945464652, CASTRO VALLEY, CA 94546-4652 |
The 2025 property tax bill for 4217 Gem Ave was $2,457.
Source: Alameda County assessment roll, as of August 5, 2026
| Type | Name |
|---|---|
| State | California |
| County | Alameda County |
| Unified School District | Castro Valley Unified School District (KG - 12) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $137,239 (+2%) Land $87,902 Building $49,337 | ||
| 2025 | $2,457.00 | $134,548 Land $86,178 Building $48,370 | |
| 2023 | $2,330.00 | $129,324 Land $82,832 Building $46,492 | $795,420 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
FEMA maps place 4217 Gem Ave in Zone X, an area of minimal flood risk.
Source: FEMA National Flood Hazard Layer, effective May 25, 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
Values are read at the parcel center point; lenders make the official flood determination.
Wildfire risk around 4217 Gem Ave is low, with a 0.01% annual chance of 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.
Source: EPA Safe Drinking Water Information System, as of September 2026
| Water System | EAST BAY MUD serves 1,468,000 people · EPA ID CA0110005 |
|---|---|
| Water Source | Surface water |
| Last State Inspection | Dec 2021 |
| Lead | Under 1 ppb (2022–2024) action level 15 ppb |
| Water Quality | None last 10 years |
|---|---|
| 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. This system sells water to local utilities; the supplier billing this address may be one of them.
Source: FCC Broadband Data Collection, based on 777 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| Sonic Telecom Fiber | 10,000 / 10,000 |
| AT&T Fiber · DSL · Fixed Wireless in parts of the area | 5,000 / 5,000 |
| Xfinity Cable | 2,000 / 250 |
| Verizon Fixed Wireless | 300 / 20 |
| Etheric Networks Fixed Wireless | 250 / 100 |
| T-Mobile Fixed Wireless | 100 / 20 |
May also be available: GeoLinks.
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