Alameda County property record for 4253 Gem Ave, Castro Valley, CA 94546
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 1 ba · 1,080 sqft · built 1947 |
| Lot Size | 0.133 acres (5,775 sqft) |
| Owner | Individual Name on File |
| Last Sale | $590,000 (Jul 2017) |
| Tax Bill | $11,942 (2025) |
| Deeds & Mortgages | Jul 2023 Transfer Jul 2023 Sale + 1 more |
| Flood Zone | Zone X (minimal risk) |
| APN | 84C-669-54 |
| Primary APN | 84C-669-54 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 1 Bath |
| Total Rooms | 5 Rooms |
| Stories | 1 Story |
| Building Area | 1,080 sqft Living Area |
| Year Built | Built 1947 |
|---|---|
| Effective Year Built | Effective 1947 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 5,775 sqft (0.133 acres) |
| Street Address | 4253 GEM AVE |
|---|---|
| City | CASTRO VALLEY |
| State | CA |
| Zip | 94546-4653 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Legal Description | LOT: 00016 BLK: 0002 TR: 0807 |
| Legal Subdivision | TRACT 807 |
| Legal Tract | 0807 |
| Legal Block | 2 |
| Legal Lot Number | 16 |
| Jurisdiction | ALAMEDA CA |
| Township / Civil Division | HAYWARD |
| Census Block Group | 3 |
| Census Block | 3011 |
| Census Tract | 430800 |
Source: Alameda County assessment roll, APN 84C-669-54, as of 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 | 57 WILD OAK PL, DANVILLE, CA 94506-4547 |
| Owner Type | Individual |
| Vesting | Community Property |
| Date | Document |
|---|---|
| Jul 18, 2023 | Intrafamily Transfer, Transfer |
| Jul 18, 2023 | Grant Deed, Transfer |
| Jul 05, 2017 | Grant Deed, Transfer OLD REPUBLIC TITLE |
| Deed Names | Verified Name on Deed |
|---|---|
| Last Sale | Jul 05, 2017 · Amount on Record |
| Deed Sale | Jul 05, 2017 · Amount on Record |
| Deed Document Number | 2017145373 |
| Last Transfer Date | Jul 13, 2023 |
| Transfer Doc | 0000081324 |
| Record Updated | Sep 20, 2026 |
| Document Type | Intrafamily Transfer |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Jul 18, 2023 |
| Property Address | 4253 GEM AVE, CASTRO VALLEY, CA 94546-4653 |
| Document Number | 0000081325 |
| Map Reference | MB 19 PG 94&95 |
| Instrument Date | Jul 13, 2023 |
| Instrument | 2023081325 |
| Transaction Type | Transfer |
| Record Updated | Aug 18, 2023 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property with Right of Survivorship |
| Address | 1331 AMALFI CT, SAN RAMON, CA 94583-3055 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Jul 18, 2023 |
| Property Address | 4253 GEM AVE, CASTRO VALLEY, CA 94546-4653 |
| Document Number | 0000081324 |
| Map Reference | MB 19 PG 94&95 |
| Instrument Date | Jul 13, 2023 |
| Instrument | 2023081324 |
| Transaction Type | Transfer |
| Record Updated | Aug 18, 2023 |
| Tax | $0.00 |
|---|---|
| Amount Accuracy | Transfer Tax Exempt |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Community Property with Right of Survivorship |
| Address | 400 CAMBERLY CT, SAN RAMON, CA 94583-3000 |
| Document Type | Grant Deed |
|---|---|
| Jurisdiction | ALAMEDA CA |
| Recording Date | Jul 05, 2017 |
| Property Address | 4253 GEM AVE, CASTRO VALLEY, CA 94546-4653 |
| Document Number | 0000145373 |
| Instrument Date | Jun 29, 2017 |
| Instrument | 145373 |
| Transaction Type | Transfer |
| Record Updated | Jul 25, 2017 |
| Title Company | OLD REPUBLIC TITLE |
| Amount | Amount Recorded |
|---|---|
| Tax | $649.00 |
| Amount Accuracy | Full Value |
| Additional |
|
| Name | Verified Name |
|---|
| Name | Verified Name |
|---|---|
| Relationship | Company |
| Address | 400 CAMBERLY CT SAN RAMON CA 945833000, SAN RAMON, CA 94583-3000 |
Source: Alameda County assessment roll as of 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 | $957,167 (+2%) Land $287,150 Building $670,017 | ||
| 2025 | $11,942.00 (+41.24%) | $938,400 (+45.43%) Land $281,520 Building $656,880 | |
| 2023 | $8,455.00 (+1.98%) | $645,241 (+2%) Land $193,572 Building $451,669 | $775,170 |
| 2022 | $8,291.00 | $632,591 Land $189,777 Building $442,814 |
Source: FEMA National Flood Hazard Layer, Alameda County (06001C), as of May 25, 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition, as of 2020 · Last verified October 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| 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 are read at the parcel center point; lenders make the official flood determination.
Source: FCC Broadband Data Collection, 777 locations within half a mile, as of December 31, 2025 · Last verified October 2026
| 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 Communications, LLC. Fixed Wireless | 250 / 100 |
| T-Mobile USA Fixed Wireless | 100 / 20 |
May also be available: California Internet.
Source: EPA Safe Drinking Water Information System, water system CA0110005, as of 2026 Q3 · EPA water system boundaries as of March 2026 · Last verified October 2026
| Water System | EAST BAY MUD serves 1,468,000 people |
|---|---|
| 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 as reported to EPA, 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. The full violation and enforcement history is in the system's EPA record.
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