20073 Diamond Ct, Castro Valley, CA 94546 Property Records

Alameda County property record for 20073 Diamond Ct, Castro Valley, CA 94546

Property Summary

Property Type	Single Family Home
Details	3 bd · 1 ba · 1,276 sqft · built 1949
Lot Size	0.176 acres (7,669 sqft)
Owner	2 Individual Names on Record
Last Sale	$1,060,000 (Nov 2021)
Tax Bill	$12,280 (2025)
Deeds & Mortgages	Nov 2021 Sale & Mortgage Jan 2021 Mortgage + 3 more
Flood Zone	Zone X (minimal risk)
APN	`84C-1064-5`

Property Details

APN / Parcel Number

Primary APN	`84C-1064-5`
Alternative APN	`084C-1064-005-00`

Interior

Bedrooms	3 Beds
Full Baths	1 Bath
Total Rooms	5 Rooms
Stories	1 Story
Building Area	1,276 sqft Living Area

Exterior

Year Built	Built 1949
Effective Year Built	Effective 1968
Architectural Style	L-Shape
Construction Type	Wood
Lot Area	7,669 sqft (0.176 acres)

Location & Zoning

Street Address	20073 DIAMOND CT
City	CASTRO VALLEY
State	CA
Zip	94546-4733
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	LOT: 00008 BLK: 0002 TR: 0799
Legal Subdivision	799 EDEN TOWNSHIP
Legal Tract	0799
Legal Block	2
Legal Lot Number	8
Jurisdiction	ALAMEDA CA
Township / Civil Division	HAYWARD
Census Block Group	3
Census Block	3005
Census Tract	430800

Owner

Source: Alameda County records, as of August 5, 2026

Owner names and exact recorded amounts are on file and can be viewed instantly on this page with a free 10-day trial.

Owner of Record	2 Individual Names on Record
Mailing Address	20073 DIAMOND CT, CASTRO VALLEY, CA 94546-4733
Occupancy	Owner Occupied
Owner Type	Individual
Vesting	Community Property

Deeds, Mortgages & Sale History

Date	Document
Nov 17, 2021	Grant Deed, Transfer · Conventional Mortgage GOOGAIN INC
Jan 28, 2021	Deed of Trust, Mortgage · Conventional Mortgage FREMONT BANK
Sep 3, 2019	Deed of Trust, Mortgage · Line of Credit FREMONT BANK
Jun 25, 2019	Grant Deed, Transfer · Conventional Mortgage FAIRWAY INDEPENDENT MORTGAGE CORP
Oct 10, 2018	Intrafamily Transfer, Transfer · ARM GUARANTEED RATE AFFINITY LLC

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Nov 17, 2021 · Amount on Record
Deed Sale	Nov 17, 2021 · Amount on Record
Prior Sale	Jun 25, 2019 · Amount on Record
Deed Document Number	2021373532
Prior Transfer Date	Oct 2, 2018
Prior Transfer Doc	0000197702
Record Updated	Oct 29, 2026

November 2021: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	ALAMEDA CA
Recording Date	Nov 17, 2021
Property Address	20073 DIAMOND CT, CASTRO VALLEY, CA 94546-4733
Document Number	0000373532
Map Reference	MB 27 PG 88
Instrument Date	Nov 10, 2021
Instrument	2021373532
Transaction Type	Transfer
Record Updated	Dec 22, 2021
Title Company	OLD REPUBLIC TITLE, OLD REPUBLIC TITLE COMPANY

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$1,166.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property with Right of Survivorship
Address	20073 DIAMOND CT, CASTRO VALLEY, CA 94546-4733

Mortgage

Document Number	0000373533
Date	Nov 17, 2021
Instrument	2021373533

Lender

Name	GOOGAIN INC
Type	Mortgage Company

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Dec 1, 2051

January 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	20073 DIAMOND CT, CASTRO VALLEY, CA 94546-4733
Transaction Type	Mortgage
Record Updated	Apr 7, 2021
Title Company	FIDELITY NATIONAL TITLE

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	20073 DIAMOND CT, CASTRO VALLEY, CA 94546-4733

Mortgage

Document Number	0000036165
Date	Jan 28, 2021
Instrument	2021036165

Lender

Name	FREMONT BANK
Type	Bank
Address	LIVERMORE, CA 94551

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Feb 1, 2051

September 2019: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	ALAMEDA CA
Property Address	20073 DIAMOND CT, CASTRO VALLEY, CA 94546-4733
Transaction Type	Mortgage
Record Updated	Feb 5, 2021
Title Company	FIDELITY NATIONAL TITLE CO

Transferred To (Grantee/Buyer)

Name	Verified Name

Mortgage

Document Number	0000172203
Date	Sep 3, 2019
Instrument	2019172203

Lender

Name	FREMONT BANK
Type	Bank
Address	LIVERMORE, CA 94551

Agreement

Type	Line of Credit
Amount	Amount Recorded
Term	299 Months
Due	Aug 26, 2044

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

June 2019: Grant Deed, Transfer

Document Type	Grant Deed
Jurisdiction	ALAMEDA CA
Recording Date	Jun 25, 2019
Property Address	20073 DIAMOND CT, CASTRO VALLEY, CA 94546-4733
Document Number	0000120314
Map Reference	MB 27 PG 88
Instrument Date	Jun 18, 2019
Instrument	2019120314
Transaction Type	Transfer
Record Updated	Aug 19, 2021
Title Company	OLD REPUBLIC TITLE COMPANY

Transaction

Amount	Amount Recorded
Downpayment	Downpayment on Record
Loan-to-Value (LTV)	LTV on Record
Tax	$0.00
Amount Accuracy	Rounded by County
Additional	Arm's Length

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property with Right of Survivorship
Address	20073 DIAMOND CT, CASTRO VALLEY, CA 94546-4733

Mortgage

Document Number	0000120315
Date	Jun 25, 2019
Instrument	2019120315

Lender

Name	FAIRWAY INDEPENDENT MORTGAGE CORP
Type	Mortgage Company

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	Jul 1, 2049

October 2018: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	ALAMEDA CA
Recording Date	Oct 10, 2018
Property Address	20073 DIAMOND CT, CASTRO VALLEY, CA 94546-4733
Document Number	0000197702
Map Reference	MB 27 PG 88
Instrument Date	Oct 2, 2018
Instrument	2018197702
Transaction Type	Transfer
Record Updated	Aug 19, 2021
Title Company	OLD REPUBLIC TITLE COMPANY

Transaction

Tax	$0.00
Amount Accuracy	Transfer Tax Exempt
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Relationship	Community Property with Right of Survivorship
Address	20073 DIAMOND CT, CASTRO VALLEY, CA 94546-4733

Mortgage

Document Number	0000197703
Date	Oct 10, 2018
Instrument	2018197703

Lender

Name	GUARANTEED RATE AFFINITY LLC
Type	Non-Lending Institution

Agreement

Type	ARM
Amount	Amount Recorded
Term	361 Months
Due	Nov 1, 2048

Interest

Rate Type	Adjustable Rate
Rate	4.25%
Type Change Date	Nov 1, 2025
Change Frequency	Annually
Min Rate At Change	2.25%
Max Rate At Change	9.25%
Index	1-Year LIBOR
Max Rate	9.25%

Tax Assessment & Valuation

Source: Alameda County assessment roll, as of August 5, 2026

Property Jurisdictions

Type	Name
State	California
County	Alameda County
Unified School District	Castro Valley Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value	Assessed Market Value
2026		$967,000 (-0.72%) Land $292,200 Building $681,800
2025	$12,280.00 (+1.92%) Homeowner's exemption	$974,000 (-9.91%) Land $292,200 Building $681,800
2023	$12,049.00 Homeowner's exemption	$1,081,200 Land $324,360 Building $756,840	$1,058,490

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

Flood

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

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.

Drinking Water

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

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, 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.

Internet Providers

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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