Alameda County property record for 4323 Gem Ave, Castro Valley, CA 94546 · Last verified August 2026
| Property Type | Residential > Single Family > Home |
|---|---|
| Bedrooms | 3 Beds |
| Bathrooms | 1 Baths |
| Year Built | Built 1948 |
| Square Footage | 1,091 sqft Living Area |
| Lot Size | 5,220 sqft (0.12 acres) |
| Occupancy | Owner Occupied |
| Last Sale | $158,000 (1995) |
| Tax Bill | $3,883.00 (2025) |
| Primary APN | 84C-1064-2 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Baths |
| Total Rooms | 6 Rooms |
| Building Area | 1,091 sqft Living Area |
| Stories | 1 Stories |
| Year Built | Built 1948 |
|---|---|
| Effective Year Built | Effective 1948 |
| Construction Type | Wood Construction |
| Lot Area | 5,220 sqft (0.12 acres) |
| Street Address | 4323 GEM AVE |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-4738 |
| Property Usage | Residential Property Usage |
| Type | Residential > Single Family > Home |
| Legal Description | LOT: 00005 BLK: 0002 TR: 0799 |
| Legal Tract | 0799 |
| Legal Block | 2 |
| Legal Lot Number | 5 |
| Jurisdiction | ALAMEDA CA |
| Minor Civil Division | HAYWARD |
| Census Blockgroup | 3 |
| Census Block | 3005 |
| Census Tract | 430800 |
Source: Alameda County records · APN 84C-1064-2
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 | 4323 GEM AVE, CASTRO VALLEY, CA 94546-4738 |
| Occupancy | Owner Occupied |
| Owner Type | Owner is an Individual, Couple or Unincorporated Entity |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Nov 22, 1995 · Amount on Record |
| Deed Sale | Nov 22, 1995 · Amount on Record |
| Deed Doc Number | 1995273831 |
| Record Refreshed | 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 | $260,711 (-0.67%) Land $79,635 Building $188,076 | ||
| 2025 | $3,883.00 (+4.78%) Homeowner's exemption | $262,462 (+4.04%) Land $78,074 Building $184,388 | |
| 2023 | $3,706.00 Homeowner's exemption | $252,272 Land $75,043 Building $177,229 | $750,060 |
4323 Gem Ave is in FEMA Zone X, outside the Special Flood Hazard Area, with no wildfire exposure.
Source: FEMA National Flood Hazard Layer · Alameda County (06001C), updated May 25, 2026
| FEMA Flood Zone | Zone X minimal flood hazard · outside the 0.2% annual chance floodplain |
|---|---|
| Special Flood Hazard Area | No |
Source: USDA Forest Service Wildfire Risk to Communities · 2nd edition (2024), fuels as of 2020
| Wildfire Risk to Homes | Not rated no burnable land in reach |
|---|---|
| Wildfire Likelihood | Negligible |
| Exposure | None beyond ember reach of burnable land |
Values are read at the parcel center point; lenders make the official flood determination.
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