1645 Observation Ct, Antioch, CA 94531 Property Records

Contra Costa County property record for 1645 Observation Ct, Antioch, CA 94531

Property Summary

Property Type	Single Family Home
Details	6 bd · 4 ba · 3,871 sqft · built 2002
Lot Size	0.271 acres (11,807 sqft)
Owner	2 Company Names on Record
Last Sale	$199,500 (May 2003)
Tax Bill	$9,581 (2025)
Deeds & Mortgages	Sep 2025 Transfer Apr 2022 Mortgage
Flood Zone	Zone X (minimal risk)
APN	`055-690-009`

Property Details

APN / Parcel Number

Primary APN	`055-690-009`
Alternative APN	`055-690-009-0`

Interior

Bedrooms	6 Beds
Full Baths	4 Baths
Total Rooms	13 Rooms
Stories	2 Stories
Building Area	3,871 sqft Living Area
1st Floor Area	1,889 sqft
2nd Floor Area	1,982 sqft

Exterior

Year Built	Built 2002
Effective Year Built	Effective 2002
Lot Area	11,807 sqft (0.271 acres)
Garage Type	Attached
Garage Area	680 sqft
Parking Spaces	2 Parking Spaces

Location & Zoning

Street Address	1645 OBSERVATION CT
City	ANTIOCH
State	CA
Zip	94531-9132
Property Category	Residential
Property Type	Residential > Single Family > Home
Legal Description	T8525 L1052
Legal Subdivision	SUBDIVISION 8525
Legal Tract	8525
Legal Lot Number	1052
Jurisdiction	CONTRA COSTA CA
Township / Civil Division	TASSAJARA
Census Block Group	2
Census Block	2003
Census Tract	355119

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	1645 OBSERVATION CT, ANTIOCH, CA 94531-9132
Occupancy	Owner Occupied
Owner Type	Company
Vesting	Trust

Deeds, Mortgages & Sale History

Date	Document
Sep 30, 2025	Intrafamily Transfer, Transfer
Apr 28, 2022	Intrafamily Transfer, Transfer · Conventional Mortgage PATELCO CU

Assessor's Deed Record

Deed Names	2 Names on Deed
Last Sale	May 30, 2003 · Amount on Record
Deed Sale	May 30, 2003 · Amount on Record
Prior Sale	Sep 20, 2002 · Amount on Record
Deed Document Number	2003252524
Last Transfer Date	Sep 26, 2025
Transfer Doc	0000102146
Record Updated	Oct 29, 2026

September 2025: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	CONTRA COSTA CA
Recording Date	Sep 30, 2025
Property Address	1645 OBSERVATION CT, ANTIOCH, CA 94531-9132
Document Number	0000102146
Map Reference	MB 434 PG 10
Instrument Date	Sep 26, 2025
Instrument	2025- 102146
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	1645 OBSERVATION CT, ANTIOCH, CA 94531-9132

April 2022: Intrafamily Transfer, Transfer

Document Type	Intrafamily Transfer
Jurisdiction	CONTRA COSTA CA
Recording Date	Apr 28, 2022
Property Address	1645 OBSERVATION CT, ANTIOCH, CA 94531-9132
Document Number	0000073825
Map Reference	MB 434 PG 10
Instrument Date	Apr 22, 2022
Instrument	2022-073825
Transaction Type	Transfer
Record Updated	Nov 3, 2022
Title Company	PLACER 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
Address	1645 OBSERVATION CT, ANTIOCH, CA 94531-9132

Mortgage

Document Number	0000073826
Date	Apr 28, 2022
Instrument	2022-073826

Lender

Name	PATELCO CU
Type	Credit Union

Agreement

Type	Conventional Mortgage
Amount	Amount Recorded
Term	361 Months
Due	May 1, 2052

Tax Assessment & Valuation

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

Property Jurisdictions

Type	Name
State	California
County	Contra Costa County
Municipality	Antioch City
Unified School District	Antioch Unified School District (KG - 12)

Tax Bill & Assessment History

Year	Tax Bill	Assessed Value
2026		$854,123 (+2%) Land $172,323 Building $681,800
2025	$9,581.00 (+6.72%)	$837,377 (+4.04%) Land $168,945 Building $668,432
2023	$8,978.00 (+1.64%) Homeowner's exemption	$804,863 Land $162,386 Building $642,477
2022	$8,833.00

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

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	Moderate above 51% of the US · lower than 69% of California
Wildfire Likelihood	0.1% 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	CITY OF ANTIOCH serves 116,781 people · EPA ID CA0710001
Water Source	Surface water
Last State Inspection	Jan 2024
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.

Internet Providers

Source: FCC Broadband Data Collection, based on 611 locations within half a mile, as of December 31, 2025

Provider	Max Down / Up (Mbps)
AT&T Fiber · DSL	5,000 / 5,000
Xfinity Cable	2,000 / 250

May also be available: T-Mobile, Unwired.

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