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4282 Gem Ave, Castro Valley, CA 94546 Property Records

Alameda County property record for 4282 Gem Ave, Castro Valley, CA 94546 · Last verified July 2026

Property Summary

Property TypeSingle Family Home
Details2 bd · 1 ba · 1,728 sqft · built 1947
Lot Size0.137 acres (5,985 sqft)
Owner2 Company Names on File
Last Sale$400,000 (Jun 2010)
Tax Bill$6,879 (2025)
Deeds & MortgagesDec 2025 Transfer
Flood ZoneZone X (minimal risk)
APN84C-669-24

Property Details

APN / Parcel Number

Primary APN84C-669-24
Alternative APN
  • 084C-0669-024-00

Interior

Bedrooms2 Beds
Full Baths1 Bath
Total Rooms5 Rooms
Stories1 Story
Building Area1,728 sqft Living Area
Fireplaces1 Fireplace
FireplaceFireplace

Exterior

Year BuiltBuilt 1947
Effective Year BuiltEffective 1957
Architectural StyleL-Shape
Construction TypeWood
Lot Area5,985 sqft (0.137 acres)
Lot Dimensions105 ft deep x 56 ft wide

Location & Zoning

Street Address4282 GEM AVE
CityCASTRO VALLEY
StateCA
Zip94546-4617
Property CategoryResidential
Property TypeResidential > Single Family > Home
Legal DescriptionLOT: 00015 BLK: 0001 TR: 0807
Legal SubdivisionTR 807
Legal Tract0807
Legal Block1
Legal Lot Number15
JurisdictionALAMEDA CA
Township / Civil DivisionHAYWARD
Census Block Group4
Census Block4000
Census Tract430800

Owner

Source: Alameda County records · APN 84C-669-24

Assessment roll updated June 20, 2025 · Last verified July 2026

Owner names and exact recorded amounts shown locked on this page are available instantly with a free trial.

Owner of Record2 Company Names on File
Mailing Address30576 BRAE BURN AVE, HAYWARD, CA 94544-7350
OccupancyOwner Occupied
Owner TypeCompany
VestingTrust, Revocable Living Trust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names2 Verified Names on Deed
Last SaleJun 17, 2010 · Amount on Record
Deed SaleJun 17, 2010 · Amount on Record
Prior SaleFeb 01, 2007 · Amount on Record
Deed Document Number2010168572
Prior Transfer DateDec 02, 1993
Prior Transfer Doc0000349821
Record UpdatedSep 20, 2026

December 2025: Intrafamily Transfer, Transfer

Document TypeIntrafamily Transfer
JurisdictionALAMEDA CA
Recording DateDec 29, 2025
Property Address4282 GEM AVE, CASTRO VALLEY, CA 94546-4617
Document Number0000166007
Map ReferenceMB 19 PG 94 & 95
Instrument DateNov 17, 2023
Instrument2025166007
Transaction TypeTransfer
Record UpdatedFeb 05, 2026

Transaction

Tax$0.00
Amount AccuracyNo Consideration Stated
Additional
  • Intrafamily Transfer

Transferred From (Grantor/Seller)

NameVerified Name

Transferred To (Grantee/Buyer)

NameVerified Name
Address30576 BRAE BURN AVE, HAYWARD, CA 94544-7350

Tax Assessment & Valuation

Source: Alameda County records · Assessment roll updated June 20, 2025 · Last verified July 2026

Property Jurisdictions

TypeName
StateCalifornia
CountyAlameda County
Unified School DistrictCastro Valley Unified School District (KG - 12)

Tax Bill & Assessment History

Assessed value and assessed market value are set for property tax purposes and are not market price estimates.

YearTax BillAssessed ValueAssessed Market Value
2025$6,879.00 (+4.18%) Homeowner's exemption$509,291 (+2.63%) Land $154,887 Building $361,404
2023$6,603.00 Homeowner's exemption$496,247 Land $148,874 Building $347,373$964,260

Flood & Wildfire

Source: FEMA National Flood Hazard Layer, Alameda County (06001C), updated May 25, 2026 · FEMA OpenFEMA NFIP redacted claims and policies, census block group 060014308004, refreshed September 2026 · USDA Forest Service Wildfire Risk to Communities, 2nd edition (2024), fuels as of 2020 · Last verified October 2026

Flood

FEMA Flood ZoneZone X
Special Flood Hazard AreaNo
Flood HazardMinimal
500-Year FloodplainNo
Community Rating SystemClass 7 (15% premium discount)
Nearby Flood Policies1 in force

Wildfire

Wildfire RiskNot rated
no burnable land in reach
Wildfire LikelihoodNegligible
ExposureNone
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.

Internet Providers

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

ProviderTechnologyDownload / Upload (Mbps)
Sonic TelecomFiber10,000 / 10,000
AT&TFiber5,000 / 5,000
XfinityCable2,000 / 250
VerizonFixed Wireless300 / 20
Etheric Communications, LLC.Fixed Wireless (licensed-by-rule)250 / 100
T-Mobile USAFixed Wireless100 / 20
AT&TDSL100 / 20

May also be available at this address: AT&T, California Internet. Availability varies by address; speeds are provider-advertised maximums, not measured.

Mobile Coverage

5G and 4G LTE

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