2004 173rd Ave, Castro Valley, CA 94546 Property Records

Alameda County property record for 2004 173rd Ave, Castro Valley, CA 94546

Property Summary

Property Type	Single Family Home
Details	2 bd · 1 ba · 830 sqft · built 1940
Lot Size	0.113 acres (4,900 sqft)
Owner	Company Name on File
Tax Bill	$3,907 (2025)
Deeds & Mortgages	Mar 2021 Mortgage
Flood Zone	Zone X (minimal risk)
APN	`80A-231-1`

Property Details

APN / Parcel Number

Primary APN	`80A-231-1`
Alternative APN	`080A-0231-001-00`

Interior

Bedrooms	2 Beds
Full Baths	1 Bath
Total Rooms	4 Rooms
Stories	1 Story
Building Area	830 sqft Living Area

Exterior

Year Built	Built 1940
Effective Year Built	Effective 1940
Architectural Style	L-Shape
Construction Type	Wood
Roof Material	Wood Shingle
Lot Area	4,900 sqft (0.113 acres)

Utilities, Heating & Cooling

Heating System	Forced Air with A/C
Sewer	Municipal
Water Source	Commercial

Location & Zoning

Street Address	2004 173RD AVE
City	CASTRO VALLEY
State	CA
Zip	94546-3810
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00001 BLK: AR: 080A PAGE: 0231
Legal Subdivision	EL PORTAL RESUB
Legal Lot Number	422-A
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	3
Census Block	3017
Census Tract	430500

Owner

Source: Alameda County records · APN 80A-231-1

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	Company Name on File
Mailing Address	2004 173RD AVE, CASTRO VALLEY, CA 94546-3810
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Assessor's Deed Record

Deed Names	Verified Name on Deed
Last Transfer Date	May 14, 2016
Transfer Doc	0000145160
Record Updated	Sep 20, 2026

March 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	2004 173RD AVE, CASTRO VALLEY, CA 94546-3810
Transaction Type	Mortgage
Record Updated	Apr 02, 2021
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	2004 173RD AVE, CASTRO VALLEY, CA 94546-3810

Mortgage

Document Number	0000099950
Date	Mar 11, 2021
Instrument	2021099950

Lender

Name	NEWREZ LLC
Type	Non-Lending Institution
Address	FORT WASHINGTON, PA 19034

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	359 Months
Due	Feb 01, 2051

Tax Assessment & Valuation

Source: Alameda County records · Assessment roll updated August 5, 2026 · Last verified August 2026

Property Jurisdictions

Type	Name
State	California
County	Alameda County
Unified School District	San Lorenzo 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.

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$259,938 (-0.67%) Land $80,081 Building $186,857
2025	$3,907.00 (+4.1%) Homeowner's exemption	$261,704 (+4.04%) Land $78,511 Building $183,193
2023	$3,753.00 Homeowner's exemption	$251,543 Land $75,463 Building $176,080	$583,110

Flood & Wildfire

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

Flood

FEMA Flood Zone	Zone X minimal risk
Flood Insurance Requirement	Not required lenders may require it

Wildfire

Wildfire Risk	Not rated no burnable land within ember reach

Values are read at the parcel center point; lenders make the official flood determination.

Internet Providers

Source: FCC Broadband Data Collection as of December 31, 2025 · Last verified October 2026

Provider	Max Down / Up (Mbps)
Sonic Telecom Fiber	10,000 / 10,000
AT&T Fiber · Fixed Wireless, DSL in parts of the area	5,000 / 5,000
Xfinity Cable	2,000 / 250

May also be available: California Internet, Etheric Communications, LLC., T-Mobile USA, Unwired, Verizon.

Based on FCC filings for 796 locations within half a mile of this property.

Drinking Water

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

Violations Reported to EPA

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.