San Joaquin County property record for 31123 S Koster Rd, Tracy, CA 95304
| Property Type | Single Family Home |
|---|---|
| Details | 3 bd · 3 ba · 2,048 sqft · built 1975 |
| Lot Size | 1.68 acres (73,529 sqft) |
| Owner | 2 Individual Names on Record |
| Last Sale | $540,000 (Dec 2016) |
| Tax Bill | $6,759 (2026) |
| Deeds & Mortgages | Sep 2017 Mortgage |
| Flood Zone | Zone X (minimal risk) |
| APN | 255-310-380-000 |
| Primary APN | 255-310-380-000 |
|---|---|
| Alternative APN |
|
| Bedrooms | 3 Beds |
|---|---|
| Full Baths | 3 Baths |
| Stories | 1 Story |
| Building Area | 2,048 sqft Living Area |
| 1st Floor Area | 2,048 sqft |
| Fireplaces | 1 Fireplace |
| Fireplace | Fireplace |
| Year Built | Built 1975 |
|---|---|
| Effective Year Built | Effective 1975 |
| Architectural Style | L-Shape |
| Construction Type | Wood |
| Lot Area | 73,529 sqft (1.68 acres) |
| Parking Spaces | 2 Parking Spaces |
| Cooling System | Central |
|---|---|
| Heating System | Central |
| Old Parcel Number | 255-310-38 |
|---|---|
| Street Address | 31123 S KOSTER RD |
| City | TRACY |
| State | CA |
| Zip | 95304-8822 |
| Property Category | Residential |
| Property Type | Residential > Single Family > Home |
| Local Zoning Code | RR |
| Legal Description | PARCEL MAPS 16 PG 200 LOT 3 |
| Legal Block | 1 |
| Legal Lot Number | 3 |
| Jurisdiction | SAN JOAQUIN CA |
| Township / Civil Division | TRACY |
| Census Block Group | 1 |
| Census Block | 1005 |
| Census Tract | 5503 |
Source: San Joaquin County records, as of October 13, 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 | 31123 S KOSTER RD, TRACY, CA 95304-8822 |
| Occupancy | Owner Occupied |
| Owner Type | Individual |
| Vesting | Joint Tenants |
| Deed Names | 2 Names on Deed |
|---|---|
| Last Sale | Dec 22, 2016 · Amount on Record |
| Deed Sale | Dec 22, 2016 · Amount on Record |
| Prior Sale | Mar 19, 2009 · Amount on Record |
| Deed Document Number | 2016160990 |
| Prior Transfer Date | Jun 25, 2012 |
| Prior Transfer Doc | 0000084218 |
| Record Updated | Oct 29, 2026 |
| Document Type | Deed of Trust |
|---|---|
| Jurisdiction | SAN JOAQUIN CA |
| Property Address | 31123 S KOSTER RD, TRACY, CA 95304-8822 |
| Transaction Type | Mortgage |
| Record Updated | Feb 5, 2021 |
| Title Company | OLD REPUBLIC TITLE COMPANY |
| Name | Verified Name |
|---|
| Document Number | 0000111757 |
|---|---|
| Date | Sep 27, 2017 |
| Instrument | 2017-111757 |
| Name | FLAGSTAR BANK FSB |
|---|---|
| Type | Bank |
| Address | TROY, MI 48098 |
| Type | Conventional Mortgage |
|---|---|
| Amount | Amount Recorded |
| Term | 361 Months |
| Due | Oct 1, 2047 |
Source: San Joaquin County assessment roll, as of September 24, 2025
| Type | Name |
|---|---|
| State | California |
| County | San Joaquin County |
| Secondary School District | Tracy Unified School District (9-12) (09 - 12) |
| Elementary School District | New Jerusalem Elementary School District (KG - 08) |
| Year | Tax Bill | Assessed Value | Assessed Market Value |
|---|---|---|---|
| 2026 | $6,759.00 (+1.47%) | ||
| 2025 | $6,661.00 (+4.91%) | $626,709 (+4.04%) Land $232,114 Building $394,595 | |
| 2023 | $6,349.00 (+1.78%) | $602,374 Land $223,101 Building $379,273 | $805,680 |
| 2022 | $6,238.00 |
Assessed value and assessed market value are set for property tax purposes and are not market price estimates.
Source: FEMA National Flood Hazard Layer, effective September 27, 2026 · OpenFEMA NFIP redacted claims and policies, as of September 2026
| FEMA Flood Zone | Zone X minimal risk |
|---|---|
| Flood Insurance Requirement | Not required lenders may require it |
| Community Rating System | Class 7 (15% premium discount) |
| Nearby Flood Policies | 3 in force |
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.
Source: USDA Forest Service Wildfire Risk to Communities (2nd edition), as of 2024
| Wildfire Risk | Moderate above 57% of the US · lower than 66% of California |
|---|---|
| Wildfire Likelihood | 0.1% annual chance |
| Exposure | None beyond ember reach |
Values cover an area roughly 900 ft across, not the parcel itself; insurers use their own ratings.
Source: FCC Broadband Data Collection, based on 57 locations within half a mile, as of December 31, 2025
| Provider | Max Down / Up (Mbps) |
|---|---|
| ezWave Fixed Wireless | 1,000 / 200 |
| Matrix Broadband Fixed Wireless | 400 / 80 |
| unWired Broadband Fixed Wireless | 400 / 50 |
| Verizon Fixed Wireless | 300 / 20 |
| T-Mobile Fixed Wireless | 100 / 20 |
| Cal.net Fixed Wireless | 100 / 20 |
| AT&T Fixed Wireless | 25 / 3 |
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