2139 Alameda Diablo, Diablo, CA 94528 Property Records

Contra Costa County property record for 2139 Alameda Diablo, Diablo, CA 94528

Property Summary

Property Type	Single Family Home
Details	4 bd · 3 ba · 4,478 sqft · built 1916
Lot Size	0.589 acres (25,650 sqft)
Owner	2 Company Names on Record
Last Sale	$2,480,000 (Jan 2016)
Tax Bill	$34,269 (2025)
Deeds & Mortgages	Sep 2025 Transfer Apr 2023 Line of Credit + 1 more
Flood Zone	Zone X (minimal risk)
APN	`195-250-050`

Property Details

APN / Parcel Number

Primary APN	`195-250-050`
Alternative APN	`195-250-050-0`

Interior

Bedrooms	4 Beds
Full Baths	3 Baths
Total Rooms	13 Rooms
Stories	1 Story
Building Area	4,478 sqft Living Area
1st Floor Area	3,708 sqft
Basement Area	631 sqft

Exterior

Year Built	Built 1916
Effective Year Built	Effective 1960
Lot Area	25,650 sqft (0.589 acres)
Garage Type	Attached
Garage Area	430 sqft
Parking Spaces	2 Parking Spaces

Utilities, Heating & Cooling

Cooling System	Central

Location & Zoning

Street Address	2139 ALAMEDA DIABLO
City	DIABLO
State	CA
Zip	94528
Property Category	Residential
Property Type	Residential > Single Family > Home
Local Zoning Code	R20
Legal Description	MT DIABLO EST PARK#1 POR LTS 304,307 & TR ADJ
Legal Subdivision	MOUNT DIABLO ESTATE PARK 01
Legal Lot Number	304
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	CENTRAL CONTRA COSTA
Census Block Group	1
Census Block	1013
Census Tract	346205

Owner

Source: Contra Costa County records, as of July 14, 2026

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

Owner of Record	2 Company Names on Record
Mailing Address	2139 ALAMEDA DIABLO, DIABLO, CA 94528
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust, Family Trust

Deeds, Mortgages & Sale History

Date	Document
Sep 29, 2025	Intrafamily Transfer, Transfer
Apr 6, 2023	Deed of Trust, Mortgage · Line of Credit BANK OF AMERICA NA
Nov 19, 2021	Deed of Trust, Mortgage · Conventional Mortgage MUFG UNION BANK NA

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	Jan 14, 2016 · Amount on Record
Deed Sale	Jan 14, 2016 · Amount on Record
Prior Sale	Dec 12, 2003 · Amount on Record
Deed Document Number	20166745
Prior Transfer Date	Sep 27, 1993
Prior Transfer Doc	0000281329
Record Updated	Oct 29, 2026

September 2025: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	CONTRA COSTA CA
Recording Date	Sep 29, 2025
Property Address	2139 ALAMEDA DIABLO, DIABLO, CA 94528
Document Number	0000101370
Map Reference	MB 15 PG 311
Instrument Date	Aug 1, 2025
Instrument	2025- 101370
Transaction Type	Transfer
Record Updated	Oct 8, 2025

Transaction

Tax	$0.00
Amount Accuracy	No Consideration Stated
Additional	Intrafamily Transfer

Transferred From (Grantor/Seller)

Name	Verified Name

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	2139 ALAMEDA DIABLO, DIABLO, CA 94528

April 2023: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	2139 ALAMEDA DIABLO, DIABLO, CA 94528
Transaction Type	Mortgage
Record Updated	Apr 17, 2023

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	PO BOX 782, DIABLO, CA 94528-0782

Mortgage

Document Number	0000031953
Date	Apr 6, 2023
Instrument	2023-031953

Lender

Name	BANK OF AMERICA NA
Type	Bank
Address	FORT WORTH, TX 76155

Agreement

Type	Line of Credit
Amount	Amount Recorded

Interest

Rate Type	Adjustable Rate
Change Frequency	Monthly

November 2021: Deed of Trust, Mortgage

Document Type	Deed of Trust
Jurisdiction	CONTRA COSTA CA
Property Address	2139 ALAMEDA DIABLO, DIABLO, CA 94528
Transaction Type	Mortgage
Record Updated	Nov 3, 2022
Title Company	STEWART TITLE GUARANTY CO

Transferred To (Grantee/Buyer)

Name	Verified Name
Address	2139 ALAMEDA DIABLO, DIABLO, CA 94528

Mortgage

Document Number	0000320785
Date	Nov 19, 2021
Instrument	2021-320785

Lender

Name	MUFG UNION BANK NA
Type	Bank
Address	SAN DIEGO, CA 92121

Agreement

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

Tax Assessment & Valuation

Source: Contra Costa County assessment roll, as of July 14, 2026

Property Jurisdictions

Type	Name
State	California
County	Contra Costa County
Unified School District	San Ramon Valley Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$3,067,356 (+2%) Land $2,354,571 Building $712,785
2025	$34,269.00 (+6.05%) Homeowner's exemption	$3,007,212 (+6.57%) Land $2,308,403 Building $698,809
2023	$32,313.00 (+0.8%) Homeowner's exemption	$2,821,813 Land $2,218,766 Building $603,047
2022	$32,057.00

Assessed value is set for property tax purposes and is not a market price estimate.

Flood

Source: FEMA National Flood Hazard Layer, effective October 12, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026

FEMA Flood Zone	Zone X minimal risk
Nearest Special Flood Hazard Area	Zone A, within 500 ft
Flood Insurance Requirement	Not required lenders may require it
Flood Insurance Cost	Premium on Record median of 18 policies
Community Rating System	Class 6 (20% premium discount)
Nearby Flood Policies	18 in force
Nearby Flood Claims	1 (2017)
Claims Outside the SFHA	1 of 1
Most Recent Claim	Feb 2017 · Severe Winter Storms, Flooding, And Mudslides

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.

Wildfire

Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024

Wildfire Risk	High above 76% of the US · above 52% of California
Wildfire Likelihood	0.5% annual chance
Exposure	Indirect within ember reach
Adjoins Burnable Land	Yes

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 153 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
Xfinity Cable	2,000 / 250
Unwired Fixed Wireless	300 / 25
T-Mobile Fixed Wireless	100 / 20
AT&T DSL	100 / 20

May also be available: Verizon.

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